GNUnet  0.11.x
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gnunet-service-gns_resolver.c File Reference

GNU Name System resolver logic. More...

#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_dnsstub_lib.h"
#include "gnunet_dht_service.h"
#include "gnunet_gnsrecord_lib.h"
#include "gnunet_namecache_service.h"
#include "gnunet_dns_service.h"
#include "gnunet_resolver_service.h"
#include "gnunet_revocation_service.h"
#include "gnunet_dnsparser_lib.h"
#include "gnunet_tun_lib.h"
#include "gnunet_gns_service.h"
#include "gns.h"
#include "gnunet-service-gns.h"
#include "gnunet-service-gns_resolver.h"
#include "gnunet_vpn_service.h"
Include dependency graph for gnunet-service-gns_resolver.c:

Go to the source code of this file.

Data Structures

struct  Gns2DnsPending
 Element of a resolution process for looking up the responsible DNS server hostname in a GNS2DNS recursive resolution. More...
 
struct  AuthorityChain
 DLL to hold the authority chain we had to pass in the resolution process. More...
 
struct  DnsResult
 A result we got from DNS. More...
 
struct  VpnContext
 Closure for vpn_allocation_cb. More...
 
struct  GNS_ResolverHandle
 Handle to a currently pending resolution. More...
 
struct  CacheOps
 Active namestore caching operations. More...
 

Macros

#define DHT_LOOKUP_TIMEOUT
 Default DHT timeout for lookups. More...
 
#define DNS_LOOKUP_TIMEOUT
 Default timeout for DNS lookups. More...
 
#define VPN_TIMEOUT   GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 30)
 Default timeout for VPN redirections. More...
 
#define DHT_GNS_REPLICATION_LEVEL   10
 DHT replication level. More...
 

Functions

int is_canonical (const char *name)
 Determine if this name is canonical (is a legal name in a zone, without delegation); note that we do not test that the name does not contain illegal characters, we only test for delegation. More...
 
static char * translate_dot_plus (struct GNS_ResolverHandle *rh, char *name)
 Expands a name ending in . More...
 
static void GNS_resolver_lookup_cancel_ (void *cls)
 Wrapper around GNS_resolver_lookup_cancel() as a task. More...
 
static void fail_resolution (struct GNS_ResolverHandle *rh)
 Function called to asynchronously fail a resolution. More...
 
static void timeout_resolution (void *cls)
 Function called when a resolution times out. More...
 
static char * resolver_lookup_get_next_label (struct GNS_ResolverHandle *rh)
 Get the next, rightmost label from the name that we are trying to resolve, and update the resolution position accordingly. More...
 
static void transmit_lookup_dns_result (struct GNS_ResolverHandle *rh)
 Gives the cumulative result obtained to the callback and clean up the request. More...
 
static void add_dns_result (struct GNS_ResolverHandle *rh, uint64_t expiration_time, uint32_t record_type, size_t data_size, const void *data)
 Add a result from DNS to the records to be returned to the application. More...
 
static void handle_dns_result (void *cls, const struct sockaddr *addr, socklen_t addrlen)
 We had to do a DNS lookup. More...
 
static void recursive_resolution (void *cls)
 Task scheduled to continue with the resolution process. More...
 
static void start_resolver_lookup (void *cls)
 Begin the resolution process from 'name', starting with the identification of the zone specified by 'name'. More...
 
static void dns_result_parser (void *cls, const struct GNUNET_TUN_DnsHeader *dns, size_t dns_len)
 Function called with the result of a DNS resolution. More...
 
static void recursive_dns_resolution (struct GNS_ResolverHandle *rh)
 Perform recursive DNS resolution. More...
 
static void handle_gns_cname_result (struct GNS_ResolverHandle *rh, const char *cname)
 We encountered a CNAME record during our resolution. More...
 
static void handle_gns_resolution_result (void *cls, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
 Process a records that were decrypted from a block. More...
 
static void vpn_allocation_cb (void *cls, int af, const void *address)
 Callback invoked from the VPN service once a redirection is available. More...
 
static void continue_with_gns2dns (struct AuthorityChain *ac)
 We have resolved one or more of the nameservers for a GNS2DNS lookup. More...
 
static void handle_gns2dns_result (void *cls, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
 We've resolved the IP address for the DNS resolver to use after encountering a GNS2DNS record. More...
 
static void handle_gns2dns_ip (void *cls, const struct sockaddr *addr, socklen_t addrlen)
 Function called by the resolver for each address obtained from DNS. More...
 
static void recursive_cname_resolution (struct GNS_ResolverHandle *rh, const struct GNUNET_GNSRECORD_Data *rd)
 We found a CNAME record, perform recursive resolution on it. More...
 
static void recursive_pkey_resolution (struct GNS_ResolverHandle *rh, const struct GNUNET_GNSRECORD_Data *rd)
 We found a PKEY record, perform recursive resolution on it. More...
 
static int recursive_gns2dns_resolution (struct GNS_ResolverHandle *rh, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
 We found one or more GNS2DNS records, perform recursive resolution on it. More...
 
static void namecache_cache_continuation (void *cls, int32_t success, const char *emsg)
 Function called once the namestore has completed the request for caching a block. More...
 
static void handle_dht_response (void *cls, struct GNUNET_TIME_Absolute exp, const struct GNUNET_HashCode *key, const struct GNUNET_PeerIdentity *get_path, unsigned int get_path_length, const struct GNUNET_PeerIdentity *put_path, unsigned int put_path_length, enum GNUNET_BLOCK_Type type, size_t size, const void *data)
 Iterator called on each result obtained for a DHT operation that expects a reply. More...
 
static void start_dht_request (struct GNS_ResolverHandle *rh, const struct GNUNET_HashCode *query)
 Initiate a DHT query for a set of GNS records. More...
 
static void handle_gns_namecache_resolution_result (void *cls, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
 Process a records that were decrypted from a block that we got from the namecache. More...
 
static void handle_namecache_block_response (void *cls, const struct GNUNET_GNSRECORD_Block *block)
 Process a record that was stored in the namecache. More...
 
static void recursive_gns_resolution_namecache (struct GNS_ResolverHandle *rh)
 Lookup tail of our authority chain in the namecache. More...
 
static void handle_revocation_result (void *cls, int is_valid)
 Function called with the result from a revocation check. More...
 
static void recursive_gns_resolution_revocation (struct GNS_ResolverHandle *rh)
 Perform revocation check on tail of our authority chain. More...
 
struct GNS_ResolverHandleGNS_resolver_lookup (const struct GNUNET_IDENTITY_PublicKey *zone, uint32_t record_type, const char *name, enum GNUNET_GNS_LocalOptions options, uint16_t recursion_depth_limit, GNS_ResultProcessor proc, void *proc_cls)
 Lookup of a record in a specific zone calls lookup result processor on result. More...
 
void GNS_resolver_lookup_cancel (struct GNS_ResolverHandle *rh)
 Cancel active resolution (i.e. More...
 
void GNS_resolver_init (struct GNUNET_NAMECACHE_Handle *nc, struct GNUNET_DHT_Handle *dht, const struct GNUNET_CONFIGURATION_Handle *c, unsigned long long max_bg_queries)
 Initialize the resolver. More...
 
void GNS_resolver_done ()
 Shutdown resolver. More...
 

Variables

static struct GNUNET_NAMECACHE_Handlenamecache_handle
 Our handle to the namecache service. More...
 
static struct GNUNET_VPN_Handlevpn_handle
 Our handle to the vpn service. More...
 
static struct GNUNET_DHT_Handledht_handle
 Resolver handle to the dht. More...
 
static struct GNUNET_CONTAINER_Heapdht_lookup_heap
 Heap for limiting parallel DHT lookups. More...
 
static unsigned long long max_allowed_background_queries
 Maximum amount of parallel queries to the DHT. More...
 
static struct GNS_ResolverHandlerlh_head
 Head of resolver lookup list. More...
 
static struct GNS_ResolverHandlerlh_tail
 Tail of resolver lookup list. More...
 
static struct CacheOpsco_head
 Organized in a DLL. More...
 
static struct CacheOpsco_tail
 Organized in a DLL. More...
 
static int disable_cache
 Use namecache. More...
 
static const struct GNUNET_CONFIGURATION_Handlecfg
 Global configuration. More...
 

Detailed Description

GNU Name System resolver logic.

Author
Martin Schanzenbach
Christian Grothoff

Definition in file gnunet-service-gns_resolver.c.

Macro Definition Documentation

◆ DHT_LOOKUP_TIMEOUT

#define DHT_LOOKUP_TIMEOUT
Value:
#define GNUNET_TIME_UNIT_SECONDS
One second.
struct GNUNET_TIME_Relative GNUNET_TIME_relative_multiply(struct GNUNET_TIME_Relative rel, unsigned long long factor)
Multiply relative time by a given factor.
Definition: time.c:311

Default DHT timeout for lookups.

Definition at line 61 of file gnunet-service-gns_resolver.c.

◆ DNS_LOOKUP_TIMEOUT

#define DNS_LOOKUP_TIMEOUT
Value:
#define GNUNET_TIME_UNIT_SECONDS
One second.
struct GNUNET_TIME_Relative GNUNET_TIME_relative_multiply(struct GNUNET_TIME_Relative rel, unsigned long long factor)
Multiply relative time by a given factor.
Definition: time.c:311

Default timeout for DNS lookups.

Definition at line 67 of file gnunet-service-gns_resolver.c.

Referenced by dns_result_parser(), handle_gns_cname_result(), and recursive_dns_resolution().

◆ VPN_TIMEOUT

Default timeout for VPN redirections.

Definition at line 73 of file gnunet-service-gns_resolver.c.

Referenced by handle_gns_resolution_result(), and vpn_allocation_cb().

◆ DHT_GNS_REPLICATION_LEVEL

#define DHT_GNS_REPLICATION_LEVEL   10

DHT replication level.

Definition at line 78 of file gnunet-service-gns_resolver.c.

Referenced by start_dht_request().

Function Documentation

◆ is_canonical()

int is_canonical ( const char *  name)

Determine if this name is canonical (is a legal name in a zone, without delegation); note that we do not test that the name does not contain illegal characters, we only test for delegation.

Note that service records (like _foo._srv) are canonical names even though they consist of multiple labels.

Examples: a.b.gnu = not canonical a = canonical _foo._srv = canonical _f.bar = not canonical

Parameters
namethe name to test
Returns
GNUNET_YES if canonical

Definition at line 532 of file gnunet-service-gns_resolver.c.

References GNUNET_NO, and GNUNET_YES.

533 {
534  const char *pos;
535  const char *dot;
536 
537  if (NULL == strchr (name,
538  (unsigned char) '.'))
539  return GNUNET_YES;
540  if ('_' != name[0])
541  return GNUNET_NO;
542  pos = &name[1];
543  while (NULL != (dot = strchr (pos,
544  (unsigned char) '.')))
545  if ('_' != dot[1])
546  return GNUNET_NO;
547  else
548  pos = dot + 1;
549  return GNUNET_YES;
550 }
const char * name

◆ translate_dot_plus()

static char* translate_dot_plus ( struct GNS_ResolverHandle rh,
char *  name 
)
static

Expands a name ending in .

  • with the zone of origin.
Parameters
rhresolution context
namename to modify (to be free'd or returned)
Returns
updated name

Definition at line 563 of file gnunet-service-gns_resolver.c.

References GNS_ResolverHandle::ac_tail, AuthorityChain::authority_info, AuthorityChain::gns_authority, GNUNET_asprintf(), GNUNET_assert, GNUNET_free, GNUNET_GNSRECORD_pkey_to_zkey(), GNUNET_YES, name, and ret.

Referenced by handle_gns_resolution_result(), and recursive_gns2dns_resolution().

565 {
566  char *ret;
567  size_t s_len = strlen (name);
568 
569  if (0 != strcmp (&name[s_len - 2],
570  ".+"))
571  return name; /* did not end in ".+" */
573  GNUNET_asprintf (&ret,
574  "%.*s.%s",
575  (int) (s_len - 2),
576  name,
579  GNUNET_free (name);
580  return ret;
581 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
int gns_authority
GNUNET_YES if the authority was a GNS authority, GNUNET_NO if the authority was a DNS authority...
struct AuthorityChain * ac_tail
DLL to store the authority chain.
int int GNUNET_asprintf(char **buf, const char *format,...) __attribute__((format(printf
Like asprintf, just portable.
const char * GNUNET_GNSRECORD_pkey_to_zkey(const struct GNUNET_IDENTITY_PublicKey *pkey)
Convert public key to the respective absolute domain name in the ".zkey" pTLD.
const char * name
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GNS_resolver_lookup_cancel_()

static void GNS_resolver_lookup_cancel_ ( void *  cls)
static

Wrapper around GNS_resolver_lookup_cancel() as a task.

Used for delayed cleanup so we can unwind the stack first.

Parameters
clsthe struct GNS_ResolverHandle

Definition at line 591 of file gnunet-service-gns_resolver.c.

References GNS_resolver_lookup_cancel(), Gns2DnsPending::rh, and GNS_ResolverHandle::task_id.

Referenced by dns_result_parser(), fail_resolution(), GNS_resolver_lookup_cancel(), handle_gns_resolution_result(), recursive_dns_resolution(), and start_resolver_lookup().

592 {
593  struct GNS_ResolverHandle *rh = cls;
594 
595  rh->task_id = NULL;
597 }
void GNS_resolver_lookup_cancel(struct GNS_ResolverHandle *rh)
Cancel active resolution (i.e.
Handle to a currently pending resolution.
struct GNUNET_SCHEDULER_Task * task_id
ID of a task associated with the resolution process.
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◆ fail_resolution()

static void fail_resolution ( struct GNS_ResolverHandle rh)
static

Function called to asynchronously fail a resolution.

Parameters
rhthe resolution to fail

Definition at line 606 of file gnunet-service-gns_resolver.c.

References GNS_resolver_lookup_cancel_(), GNUNET_assert, GNUNET_SCHEDULER_add_now(), GNS_ResolverHandle::proc, GNS_ResolverHandle::proc_cls, and GNS_ResolverHandle::task_id.

Referenced by continue_with_gns2dns(), dns_result_parser(), handle_dht_response(), handle_gns_resolution_result(), handle_namecache_block_response(), handle_revocation_result(), recursive_cname_resolution(), recursive_pkey_resolution(), recursive_resolution(), start_dht_request(), and timeout_resolution().

607 {
608  rh->proc (rh->proc_cls,
609  0,
610  NULL);
611  GNUNET_assert (NULL == rh->task_id);
613  rh);
614 }
static void GNS_resolver_lookup_cancel_(void *cls)
Wrapper around GNS_resolver_lookup_cancel() as a task.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
GNS_ResultProcessor proc
called when resolution phase finishes
void * proc_cls
closure passed to proc
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1296
struct GNUNET_SCHEDULER_Task * task_id
ID of a task associated with the resolution process.
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◆ timeout_resolution()

static void timeout_resolution ( void *  cls)
static

Function called when a resolution times out.

Parameters
clsthe struct GNS_ResolverHandle

Definition at line 623 of file gnunet-service-gns_resolver.c.

References fail_resolution(), Gns2DnsPending::rh, and GNS_ResolverHandle::task_id.

Referenced by recursive_dns_resolution().

624 {
625  struct GNS_ResolverHandle *rh = cls;
626 
627  rh->task_id = NULL;
628  fail_resolution (rh);
629 }
Handle to a currently pending resolution.
struct GNUNET_SCHEDULER_Task * task_id
ID of a task associated with the resolution process.
static void fail_resolution(struct GNS_ResolverHandle *rh)
Function called to asynchronously fail a resolution.
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◆ resolver_lookup_get_next_label()

static char* resolver_lookup_get_next_label ( struct GNS_ResolverHandle rh)
static

Get the next, rightmost label from the name that we are trying to resolve, and update the resolution position accordingly.

Labels usually consist of up to 63 characters without a period ("."); however, we use a special convention to support SRV and TLSA records where the domain name includes an encoding for a service and protocol in the name. The syntax (see RFC 2782) here is "_Service._Proto.Name" and in this special case we include the "_Service._Proto" in the rightmost label. Thus, for "_443._tcp.foo.bar" we first return the label "bar" and then the label "_443._tcp.foo". The special case is detected by the presence of labels beginning with an underscore. Whenever a label begins with an underscore, it is combined with the label to its right (and the "." is preserved).

Parameters
rhhandle to the resolution operation to get the next label from
Returns
NULL if there are no more labels

Definition at line 650 of file gnunet-service-gns_resolver.c.

References _, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_strndup, len, memrchr, GNS_ResolverHandle::name, GNS_ResolverHandle::name_resolution_pos, GNS_ResolverHandle::protocol, ret, rp, and GNS_ResolverHandle::service.

Referenced by handle_gns_cname_result(), recursive_pkey_resolution(), and start_resolver_lookup().

651 {
652  const char *rp;
653  const char *dot;
654  size_t len;
655  char *ret;
656  char *srv_name;
657  char *proto_name;
658  struct protoent *pe;
659  struct servent *se;
660 
661  if (0 == rh->name_resolution_pos)
662  return NULL;
663  dot = memrchr (rh->name,
664  (int) '.',
665  rh->name_resolution_pos);
666  if (NULL == dot)
667  {
668  /* done, this was the last one */
669  len = rh->name_resolution_pos;
670  rp = rh->name;
671  rh->name_resolution_pos = 0;
672  }
673  else
674  {
675  /* advance by one label */
676  len = rh->name_resolution_pos - (dot - rh->name) - 1;
677  rp = dot + 1;
678  rh->name_resolution_pos = dot - rh->name;
679  }
680  rh->protocol = 0;
681  rh->service = 0;
682  ret = GNUNET_strndup (rp, len);
683  /* If we have labels starting with underscore with label on
684  * the right (SRV/DANE/BOX case), determine port/protocol;
685  * The format of `rh->name` must be "_PORT._PROTOCOL".
686  */
687  if (('_' == rh->name[0]) &&
688  (NULL != (dot = memrchr (rh->name,
689  (int) '.',
690  rh->name_resolution_pos))) &&
691  ('_' == dot[1]) &&
692  (NULL == memrchr (rh->name,
693  (int) '.',
694  dot - rh->name)))
695  {
696  srv_name = GNUNET_strndup (&rh->name[1],
697  (dot - rh->name) - 1);
698  proto_name = GNUNET_strndup (&dot[2],
699  rh->name_resolution_pos - (dot - rh->name)
700  - 2);
701  rh->name_resolution_pos = 0;
702  pe = getprotobyname (proto_name);
703  if (NULL == pe)
704  {
706  _ ("Protocol `%s' unknown, skipping labels.\n"),
707  proto_name);
708  GNUNET_free (proto_name);
709  GNUNET_free (srv_name);
710  return ret;
711  }
712  se = getservbyname (srv_name,
713  proto_name);
714  if (NULL == se)
715  {
717  _ (
718  "Service `%s' unknown for protocol `%s', trying as number.\n"),
719  srv_name,
720  proto_name);
721  if (1 != sscanf (srv_name, "%u", &rh->service))
722  {
724  _ ("Service `%s' not a port, skipping service labels.\n"),
725  srv_name);
726  GNUNET_free (proto_name);
727  GNUNET_free (srv_name);
728  return ret;
729  }
730  }
731  else
732  {
733  rh->service = se->s_port;
734  }
735  rh->protocol = pe->p_proto;
736  GNUNET_free (proto_name);
737  GNUNET_free (srv_name);
738  }
739  return ret;
740 }
#define memrchr(s, c, n)
Definition: compat.h:49
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
char * name
The name to resolve.
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
int service
For SRV and TLSA records, the number of the service specified in the name.
int protocol
For SRV and TLSA records, the number of the protocol specified in the name.
size_t name_resolution_pos
Current offset in name where we are resolving.
#define GNUNET_strndup(a, length)
Wrapper around GNUNET_xstrndup_.
#define GNUNET_log(kind,...)
static char * rp
Relying party.
#define GNUNET_free(ptr)
Wrapper around free.
uint16_t len
length of data (which is always a uint32_t, but presumably this can be used to specify that fewer byt...
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◆ transmit_lookup_dns_result()

static void transmit_lookup_dns_result ( struct GNS_ResolverHandle rh)
static

Gives the cumulative result obtained to the callback and clean up the request.

Parameters
rhresolution process that has culminated in a result

If this is a LEHO, we added this before. It must be a supplemental record #LSD0001

Definition at line 749 of file gnunet-service-gns_resolver.c.

References GNUNET_GNSRECORD_Data::data, DnsResult::data, GNUNET_GNSRECORD_Data::data_size, DnsResult::data_size, GNS_ResolverHandle::dns_result_head, GNUNET_GNSRECORD_Data::expiration_time, DnsResult::expiration_time, GNUNET_GNSRECORD_Data::flags, GNS_resolver_lookup_cancel(), GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_GNSRECORD_RF_NONE, GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION, GNUNET_GNSRECORD_RF_SUPPLEMENTAL, GNUNET_GNSRECORD_TYPE_LEHO, GNUNET_log, DnsResult::next, GNS_ResolverHandle::proc, GNS_ResolverHandle::proc_cls, GNUNET_GNSRECORD_Data::record_type, and DnsResult::record_type.

Referenced by handle_dns_result().

750 {
751  struct DnsResult *pos;
752  unsigned int n;
753  unsigned int i;
754 
755  n = 0;
756  for (pos = rh->dns_result_head; NULL != pos; pos = pos->next)
757  n++;
758  {
759  struct GNUNET_GNSRECORD_Data rd[n];
760 
761  i = 0;
762  for (pos = rh->dns_result_head; NULL != pos; pos = pos->next)
763  {
764  rd[i].data = pos->data;
765  rd[i].data_size = pos->data_size;
766  rd[i].record_type = pos->record_type;
767  rd[i].flags = GNUNET_GNSRECORD_RF_NONE;
773  rd[i].flags |= GNUNET_GNSRECORD_RF_SUPPLEMENTAL;
774  if (0 == pos->expiration_time)
775  {
777  rd[i].expiration_time = 0;
778  }
779  else
780  {
781  rd[i].expiration_time = pos->expiration_time;
782  }
783  i++;
784  }
785  GNUNET_assert (i == n);
787  "Transmitting standard DNS result with %u records\n",
788  n);
789  rh->proc (rh->proc_cls,
790  n,
791  rd);
792  }
794 }
void GNS_resolver_lookup_cancel(struct GNS_ResolverHandle *rh)
Cancel active resolution (i.e.
size_t data_size
Number of bytes in data.
uint64_t expiration_time
Expiration time for the DNS record, 0 if we didn't get anything useful (i.e.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
GNS_ResultProcessor proc
called when resolution phase finishes
This is a supplemental record.
void * proc_cls
closure passed to proc
uint32_t record_type
Type of the GNS/DNS record.
const void * data
Binary value stored in the DNS record (appended to this struct)
#define GNUNET_GNSRECORD_TYPE_LEHO
legacy hostnames
const void * data
Binary value stored in the DNS record.
A result we got from DNS.
uint32_t record_type
Type of the GNS/DNS record.
struct DnsResult * next
Kept in DLL.
#define GNUNET_log(kind,...)
This expiration time of the record is a relative time (not an absolute time).
struct DnsResult * dns_result_head
DLL of results we got from DNS.
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◆ add_dns_result()

static void add_dns_result ( struct GNS_ResolverHandle rh,
uint64_t  expiration_time,
uint32_t  record_type,
size_t  data_size,
const void *  data 
)
static

Add a result from DNS to the records to be returned to the application.

Parameters
rhresolution request to extend with a result
expiration_timeexpiration time for the answer
record_typeDNS record type of the answer
data_sizenumber of bytes in data
databinary data to return in DNS record

Definition at line 807 of file gnunet-service-gns_resolver.c.

References DnsResult::data, data_size, DnsResult::data_size, GNS_ResolverHandle::dns_result_head, GNS_ResolverHandle::dns_result_tail, DnsResult::expiration_time, GNUNET_CONTAINER_DLL_insert, GNUNET_malloc, GNUNET_memcpy, DnsResult::record_type, and res.

Referenced by dns_result_parser(), and handle_dns_result().

812 {
813  struct DnsResult *res;
814 
815  res = GNUNET_malloc (sizeof(struct DnsResult) + data_size);
817  res->data_size = data_size;
818  res->record_type = record_type;
819  res->data = &res[1];
820  GNUNET_memcpy (&res[1],
821  data,
822  data_size);
824  rh->dns_result_tail,
825  res);
826 }
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
size_t data_size
Number of bytes in data.
uint64_t expiration_time
Expiration time for the DNS record, 0 if we didn't get anything useful (i.e.
static size_t data_size
Number of bytes in data.
Definition: gnunet-abd.c:187
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
uint32_t record_type
Type of the GNS/DNS record.
const void * data
Binary value stored in the DNS record (appended to this struct)
static int res
A result we got from DNS.
struct DnsResult * dns_result_tail
DLL of results we got from DNS.
uint32_t data
The data value.
#define GNUNET_malloc(size)
Wrapper around malloc.
struct DnsResult * dns_result_head
DLL of results we got from DNS.
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◆ handle_dns_result()

static void handle_dns_result ( void *  cls,
const struct sockaddr *  addr,
socklen_t  addrlen 
)
static

We had to do a DNS lookup.

Convert the result (if any) and return it.

Parameters
clsclosure with the struct GNS_ResolverHandle
addrone of the addresses of the host, NULL for the last address
addrlenlength of the address

Definition at line 838 of file gnunet-service-gns_resolver.c.

References add_dns_result(), GNUNET_break, GNUNET_DNSPARSER_TYPE_A, GNUNET_DNSPARSER_TYPE_AAAA, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, recursive_resolution(), Gns2DnsPending::rh, start_resolver_lookup(), GNS_ResolverHandle::std_resolve, and transmit_lookup_dns_result().

Referenced by dns_result_parser(), and handle_gns_cname_result().

841 {
842  struct GNS_ResolverHandle *rh = cls;
843  const struct sockaddr_in *sa4;
844  const struct sockaddr_in6 *sa6;
845 
846  if (NULL == addr)
847  {
848  rh->std_resolve = NULL;
850  return;
851  }
853  "Received %u bytes of DNS IP data\n",
854  addrlen);
855  switch (addr->sa_family)
856  {
857  case AF_INET:
858  sa4 = (const struct sockaddr_in *) addr;
859  add_dns_result (rh,
860  0 /* expiration time is unknown */,
862  sizeof(struct in_addr),
863  &sa4->sin_addr);
864  break;
865 
866  case AF_INET6:
867  sa6 = (const struct sockaddr_in6 *) addr;
868  add_dns_result (rh,
869  0 /* expiration time is unknown */,
871  sizeof(struct in6_addr),
872  &sa6->sin6_addr);
873  break;
874 
875  default:
876  GNUNET_break (0);
877  break;
878  }
879 }
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
Handle to a currently pending resolution.
struct GNUNET_RESOLVER_RequestHandle * std_resolve
Handle for standard DNS resolution, NULL if none is active.
static void transmit_lookup_dns_result(struct GNS_ResolverHandle *rh)
Gives the cumulative result obtained to the callback and clean up the request.
#define GNUNET_DNSPARSER_TYPE_AAAA
#define GNUNET_log(kind,...)
#define GNUNET_DNSPARSER_TYPE_A
static void add_dns_result(struct GNS_ResolverHandle *rh, uint64_t expiration_time, uint32_t record_type, size_t data_size, const void *data)
Add a result from DNS to the records to be returned to the application.
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◆ recursive_resolution()

static void recursive_resolution ( void *  cls)
static

Task scheduled to continue with the resolution process.

Parameters
clsthe 'struct GNS_ResolverHandle' of the resolution
tctask context
clsthe struct GNS_ResolverHandle of the resolution

Definition at line 2770 of file gnunet-service-gns_resolver.c.

References GNS_ResolverHandle::ac_tail, fail_resolution(), AuthorityChain::gns_authority, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_YES, GNS_ResolverHandle::loop_limiter, GNS_ResolverHandle::loop_threshold, GNS_ResolverHandle::name, recursive_dns_resolution(), recursive_gns_resolution_revocation(), Gns2DnsPending::rh, and GNS_ResolverHandle::task_id.

Referenced by continue_with_gns2dns(), handle_dns_result(), handle_gns_cname_result(), handle_gns_resolution_result(), recursive_pkey_resolution(), and start_resolver_lookup().

2771 {
2772  struct GNS_ResolverHandle *rh = cls;
2773 
2774  rh->task_id = NULL;
2775  if (rh->loop_threshold < rh->loop_limiter++)
2776  {
2778  "Encountered unbounded recursion resolving `%s'\n",
2779  rh->name);
2780  fail_resolution (rh);
2781  return;
2782  }
2783  if (GNUNET_YES == rh->ac_tail->gns_authority)
2785  else
2787 }
static void recursive_gns_resolution_revocation(struct GNS_ResolverHandle *rh)
Perform revocation check on tail of our authority chain.
unsigned int loop_threshold
Maximum value of loop_limiter allowed by client.
char * name
The name to resolve.
int gns_authority
GNUNET_YES if the authority was a GNS authority, GNUNET_NO if the authority was a DNS authority...
Handle to a currently pending resolution.
struct AuthorityChain * ac_tail
DLL to store the authority chain.
struct GNUNET_SCHEDULER_Task * task_id
ID of a task associated with the resolution process.
static void fail_resolution(struct GNS_ResolverHandle *rh)
Function called to asynchronously fail a resolution.
#define GNUNET_log(kind,...)
static void recursive_dns_resolution(struct GNS_ResolverHandle *rh)
Perform recursive DNS resolution.
unsigned int loop_limiter
We increment the loop limiter for each step in a recursive resolution.
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◆ start_resolver_lookup()

static void start_resolver_lookup ( void *  cls)
static

Begin the resolution process from 'name', starting with the identification of the zone specified by 'name'.

Parameters
clsclosure with struct GNS_ResolverHandle *rh
clsthe struct GNS_ResolverHandle

Definition at line 2797 of file gnunet-service-gns_resolver.c.

References Gns2DnsPending::ac, GNS_ResolverHandle::ac_head, GNS_ResolverHandle::ac_tail, AuthorityChain::authority_info, GNS_ResolverHandle::authority_zone, GNUNET_GNSRECORD_Data::data, GNUNET_GNSRECORD_Data::data_size, GNUNET_GNSRECORD_Data::expiration_time, GNUNET_GNSRECORD_Data::flags, AuthorityChain::gns_authority, GNS_resolver_lookup_cancel_(), GNUNET_assert, GNUNET_CONTAINER_DLL_insert_tail, GNUNET_DNSPARSER_TYPE_A, GNUNET_DNSPARSER_TYPE_AAAA, GNUNET_GNS_EMPTY_LABEL_AT, GNUNET_new, GNUNET_SCHEDULER_add_now(), GNUNET_strdup, GNUNET_YES, AuthorityChain::label, GNS_ResolverHandle::name, GNS_ResolverHandle::proc, GNS_ResolverHandle::proc_cls, GNUNET_GNSRECORD_Data::record_type, recursive_resolution(), resolver_lookup_get_next_label(), Gns2DnsPending::rh, AuthorityChain::rh, and GNS_ResolverHandle::task_id.

Referenced by GNS_resolver_lookup(), handle_dns_result(), and recursive_gns2dns_resolution().

2798 {
2799  struct GNS_ResolverHandle *rh = cls;
2800  struct AuthorityChain *ac;
2801  struct in_addr v4;
2802  struct in6_addr v6;
2803 
2804  rh->task_id = NULL;
2805  if (1 == inet_pton (AF_INET,
2806  rh->name,
2807  &v4))
2808  {
2809  /* name is IPv4 address, pretend it's an A record */
2810  struct GNUNET_GNSRECORD_Data rd;
2811 
2812  rd.data = &v4;
2813  rd.data_size = sizeof(v4);
2814  rd.expiration_time = UINT64_MAX;
2815  rd.record_type = GNUNET_DNSPARSER_TYPE_A;
2816  rd.flags = 0;
2817  rh->proc (rh->proc_cls,
2818  1,
2819  &rd);
2820  GNUNET_assert (NULL == rh->task_id);
2822  rh);
2823  return;
2824  }
2825  if (1 == inet_pton (AF_INET6,
2826  rh->name,
2827  &v6))
2828  {
2829  /* name is IPv6 address, pretend it's an AAAA record */
2830  struct GNUNET_GNSRECORD_Data rd;
2831 
2832  rd.data = &v6;
2833  rd.data_size = sizeof(v6);
2834  rd.expiration_time = UINT64_MAX;
2835  rd.record_type = GNUNET_DNSPARSER_TYPE_AAAA;
2836  rd.flags = 0;
2837  rh->proc (rh->proc_cls,
2838  1,
2839  &rd);
2840  GNUNET_assert (NULL == rh->task_id);
2842  rh);
2843  return;
2844  }
2845 
2846  ac = GNUNET_new (struct AuthorityChain);
2847  ac->rh = rh;
2849  if (NULL == ac->label)
2850  /* name was just the "TLD", so we default to label
2851  #GNUNET_GNS_EMPTY_LABEL_AT */
2853  ac->gns_authority = GNUNET_YES;
2856  rh->ac_tail,
2857  ac);
2859  rh);
2860 }
static void recursive_resolution(void *cls)
Task scheduled to continue with the resolution process.
#define GNUNET_GNS_EMPTY_LABEL_AT
String we use to indicate an empty label (top-level entry in the zone).
static void GNS_resolver_lookup_cancel_(void *cls)
Wrapper around GNS_resolver_lookup_cancel() as a task.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
char * label
label/name corresponding to the authority
GNS_ResultProcessor proc
called when resolution phase finishes
#define GNUNET_new(type)
Allocate a struct or union of the given type.
char * name
The name to resolve.
int gns_authority
GNUNET_YES if the authority was a GNS authority, GNUNET_NO if the authority was a DNS authority...
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
struct AuthorityChain * ac_head
DLL to store the authority chain.
Handle to a currently pending resolution.
void * proc_cls
closure passed to proc
const void * data
Binary value stored in the DNS record.
static char * resolver_lookup_get_next_label(struct GNS_ResolverHandle *rh)
Get the next, rightmost label from the name that we are trying to resolve, and update the resolution ...
struct AuthorityChain * ac_tail
DLL to store the authority chain.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1296
struct GNS_ResolverHandle * rh
Resolver handle this entry in the chain belongs to.
DLL to hold the authority chain we had to pass in the resolution process.
struct GNUNET_SCHEDULER_Task * task_id
ID of a task associated with the resolution process.
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
#define GNUNET_CONTAINER_DLL_insert_tail(head, tail, element)
Insert an element at the tail of a DLL.
struct GNUNET_IDENTITY_PublicKey authority_zone
The top-level GNS authoritative zone to query.
#define GNUNET_DNSPARSER_TYPE_AAAA
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
#define GNUNET_DNSPARSER_TYPE_A
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◆ dns_result_parser()

static void dns_result_parser ( void *  cls,
const struct GNUNET_TUN_DnsHeader dns,
size_t  dns_len 
)
static

Function called with the result of a DNS resolution.

Parameters
clsthe request handle of the resolution that we were attempting to make
dnsdns response, never NULL
dns_lennumber of bytes in dns

Definition at line 911 of file gnunet-service-gns_resolver.c.

References _, GNUNET_TIME_Absolute::abs_value_us, GNS_ResolverHandle::ac_tail, add_dns_result(), GNUNET_DNSPARSER_Packet::additional_records, GNUNET_DNSPARSER_Packet::answers, GNUNET_DNSPARSER_Packet::authority_records, buf, GNUNET_GNSRECORD_Data::data, GNUNET_DNSPARSER_RawRecord::data, GNUNET_DNSPARSER_Record::data, GNUNET_DNSPARSER_RawRecord::data_len, GNUNET_GNSRECORD_Data::data_size, DNS_LOOKUP_TIMEOUT, GNS_ResolverHandle::dns_request, GNUNET_GNSRECORD_Data::expiration_time, GNUNET_DNSPARSER_Record::expiration_time, fail_resolution(), GNUNET_GNSRECORD_Data::flags, GNS_resolver_lookup_cancel_(), GNUNET_break, GNUNET_break_op, GNUNET_DNSPARSER_builder_add_mx(), GNUNET_DNSPARSER_builder_add_name(), GNUNET_DNSPARSER_builder_add_soa(), GNUNET_DNSPARSER_builder_add_srv(), GNUNET_DNSPARSER_free_packet(), GNUNET_DNSPARSER_parse(), GNUNET_DNSPARSER_TYPE_A, GNUNET_DNSPARSER_TYPE_AAAA, GNUNET_DNSPARSER_TYPE_CNAME, GNUNET_DNSPARSER_TYPE_MX, GNUNET_DNSPARSER_TYPE_NS, GNUNET_DNSPARSER_TYPE_PTR, GNUNET_DNSPARSER_TYPE_SOA, GNUNET_DNSPARSER_TYPE_SRV, GNUNET_DNSSTUB_resolve_cancel(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION, GNUNET_GNSRECORD_RF_SUPPLEMENTAL, GNUNET_GNSRECORD_TYPE_LEHO, GNUNET_log, GNUNET_OK, GNUNET_RESOLVER_ip_get(), GNUNET_RESOLVER_request_cancel(), GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), GNUNET_strdup, GNUNET_TIME_UNIT_HOURS, handle_dns_result(), GNUNET_DNSPARSER_Record::hostname, GNUNET_TUN_DnsHeader::id, AuthorityChain::label, GNS_ResolverHandle::leho, GNUNET_DNSPARSER_Record::mx, GNS_ResolverHandle::name, GNUNET_DNSPARSER_Record::name, GNS_ResolverHandle::name_resolution_pos, GNUNET_DNSPARSER_Packet::num_additional_records, GNUNET_DNSPARSER_Packet::num_answers, GNUNET_DNSPARSER_Packet::num_authority_records, GNS_ResolverHandle::original_dns_id, p, GNS_ResolverHandle::proc, GNS_ResolverHandle::proc_cls, GNUNET_DNSPARSER_Record::raw, GNUNET_GNSRECORD_Data::record_type, GNS_ResolverHandle::record_type, Gns2DnsPending::rh, GNUNET_DNSPARSER_Record::soa, GNUNET_DNSPARSER_Record::srv, GNS_ResolverHandle::std_resolve, GNS_ResolverHandle::task_id, and GNUNET_DNSPARSER_Record::type.

Referenced by recursive_dns_resolution().

914 {
915  struct GNS_ResolverHandle *rh = cls;
916  struct GNUNET_DNSPARSER_Packet *p;
917  const struct GNUNET_DNSPARSER_Record *rec;
918  unsigned int rd_count;
919 
920  if (NULL == dns)
921  {
922  rh->dns_request = NULL;
924  rh->task_id = NULL;
925  fail_resolution (rh);
926  return;
927  }
928  if (rh->original_dns_id != dns->id)
929  {
930  /* DNS answer, but for another query */
931  return;
932  }
933  p = GNUNET_DNSPARSER_parse ((const char *) dns,
934  dns_len);
935  if (NULL == p)
936  {
938  _ ("Failed to parse DNS response\n"));
939  return;
940  }
941 
942  /* We got a result from DNS */
944  "Received DNS response for `%s' with %u answers\n",
945  rh->ac_tail->label,
946  (unsigned int) p->num_answers);
947  if ((p->num_answers > 0) &&
950  {
951  int af;
952 
954  "Got CNAME `%s' from DNS for `%s'\n",
955  p->answers[0].data.hostname,
956  rh->name);
957  if (NULL != rh->std_resolve)
958  {
960  "Multiple CNAME results from DNS resolving `%s'! Not really allowed...\n",
961  rh->name);
963  }
964  GNUNET_free (rh->name);
965  rh->name = GNUNET_strdup (p->answers[0].data.hostname);
966  rh->name_resolution_pos = strlen (rh->name);
967  switch (rh->record_type)
968  {
970  af = AF_INET;
971  break;
972 
974  af = AF_INET6;
975  break;
976 
977  default:
978  af = AF_UNSPEC;
979  break;
980  }
981  if (NULL != rh->leho)
982  add_dns_result (rh,
983  GNUNET_TIME_UNIT_HOURS.rel_value_us,
985  strlen (rh->leho),
986  rh->leho);
988  af,
991  rh);
994  rh->dns_request = NULL;
995  return;
996  }
997 
998  /* convert from (parsed) DNS to (binary) GNS format! */
999  rd_count = p->num_answers + p->num_authority_records
1001  {
1002  struct GNUNET_GNSRECORD_Data rd[rd_count + 1]; /* +1 for LEHO */
1003  int skip;
1004  char buf[UINT16_MAX];
1005  size_t buf_off;
1006  size_t buf_start;
1007 
1008  buf_off = 0;
1009  skip = 0;
1010  memset (rd,
1011  0,
1012  sizeof(rd));
1013  for (unsigned int i = 0; i < rd_count; i++)
1014  {
1015  if (i < p->num_answers)
1016  rec = &p->answers[i];
1017  else if (i < p->num_answers + p->num_authority_records)
1018  rec = &p->authority_records[i - p->num_answers];
1019  else
1020  rec = &p->additional_records[i - p->num_answers
1021  - p->num_authority_records];
1022  /* As we copied the full DNS name to 'rh->ac_tail->label', this
1023  should be the correct check to see if this record is actually
1024  a record for our label... */
1025  if (0 != strcmp (rec->name,
1026  rh->ac_tail->label))
1027  {
1029  "Dropping record `%s', does not match desired name `%s'\n",
1030  rec->name,
1031  rh->ac_tail->label);
1032  skip++;
1033  continue;
1034  }
1035  rd[i - skip].record_type = rec->type;
1036  rd[i - skip].expiration_time = rec->expiration_time.abs_value_us;
1037  switch (rec->type)
1038  {
1040  if (rec->data.raw.data_len != sizeof(struct in_addr))
1041  {
1042  GNUNET_break_op (0);
1043  skip++;
1044  continue;
1045  }
1046  rd[i - skip].data_size = rec->data.raw.data_len;
1047  rd[i - skip].data = rec->data.raw.data;
1048  break;
1049 
1051  if (rec->data.raw.data_len != sizeof(struct in6_addr))
1052  {
1053  GNUNET_break_op (0);
1054  skip++;
1055  continue;
1056  }
1057  rd[i - skip].data_size = rec->data.raw.data_len;
1058  rd[i - skip].data = rec->data.raw.data;
1059  break;
1060 
1064  buf_start = buf_off;
1065  if (GNUNET_OK !=
1067  sizeof(buf),
1068  &buf_off,
1069  rec->data.hostname))
1070  {
1071  GNUNET_break (0);
1072  skip++;
1073  continue;
1074  }
1075  rd[i - skip].data_size = buf_off - buf_start;
1076  rd[i - skip].data = &buf[buf_start];
1077  break;
1078 
1080  buf_start = buf_off;
1081  if (GNUNET_OK !=
1083  sizeof(buf),
1084  &buf_off,
1085  rec->data.soa))
1086  {
1087  GNUNET_break (0);
1088  skip++;
1089  continue;
1090  }
1091  rd[i - skip].data_size = buf_off - buf_start;
1092  rd[i - skip].data = &buf[buf_start];
1093  break;
1094 
1096  buf_start = buf_off;
1097  if (GNUNET_OK !=
1099  sizeof(buf),
1100  &buf_off,
1101  rec->data.mx))
1102  {
1103  GNUNET_break (0);
1104  skip++;
1105  continue;
1106  }
1107  rd[i - skip].data_size = buf_off - buf_start;
1108  rd[i - skip].data = &buf[buf_start];
1109  break;
1110 
1112  buf_start = buf_off;
1113  if (GNUNET_OK !=
1115  sizeof(buf),
1116  &buf_off,
1117  rec->data.srv))
1118  {
1119  GNUNET_break (0);
1120  skip++;
1121  continue;
1122  }
1123  rd[i - skip].data_size = buf_off - buf_start;
1124  rd[i - skip].data = &buf[buf_start];
1125  break;
1126 
1127  default:
1129  _ ("Skipping record of unsupported type %d\n"),
1130  rec->type);
1131  skip++;
1132  continue;
1133  }
1134  } /* end of for all records in answer */
1135  if (NULL != rh->leho)
1136  {
1137  rd[rd_count - skip].record_type = GNUNET_GNSRECORD_TYPE_LEHO;
1138  rd[rd_count - skip].flags = GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION;
1139  rd[rd_count - skip].flags |= GNUNET_GNSRECORD_RF_SUPPLEMENTAL;
1140  rd[rd_count - skip].expiration_time = GNUNET_TIME_UNIT_HOURS.rel_value_us;
1141  rd[rd_count - skip].data = rh->leho;
1142  rd[rd_count - skip].data_size = strlen (rh->leho);
1143  skip--; /* skip one LESS */
1145  "Adding LEHO %s\n",
1146  rh->leho);
1147  }
1149  "Returning DNS response for `%s' with %u answers\n",
1150  rh->ac_tail->label,
1151  (unsigned int) (rd_count - skip));
1152  rh->proc (rh->proc_cls,
1153  rd_count - skip,
1154  rd);
1156  rh->dns_request = NULL;
1157  }
1159  if (NULL != rh->task_id)
1160  GNUNET_SCHEDULER_cancel (rh->task_id); /* should be timeout task */
1162  rh);
1163 }
struct GNUNET_DNSPARSER_Record * answers
Array of all answers in the packet, must contain "num_answers" entries.
uint16_t type
See GNUNET_DNSPARSER_TYPE_*.
void GNUNET_RESOLVER_request_cancel(struct GNUNET_RESOLVER_RequestHandle *rh)
Cancel a request that is still pending with the resolver.
#define GNUNET_TIME_UNIT_HOURS
One hour.
#define GNUNET_DNSPARSER_TYPE_CNAME
struct GNUNET_DNSPARSER_SrvRecord * srv
SRV data for SRV records.
static void handle_dns_result(void *cls, const struct sockaddr *addr, socklen_t addrlen)
We had to do a DNS lookup.
static void GNS_resolver_lookup_cancel_(void *cls)
Wrapper around GNS_resolver_lookup_cancel() as a task.
char * label
label/name corresponding to the authority
int GNUNET_DNSPARSER_builder_add_srv(char *dst, size_t dst_len, size_t *off, const struct GNUNET_DNSPARSER_SrvRecord *srv)
Add an SRV record to the UDP packet at the given location.
Definition: dnsparser.c:1118
GNS_ResultProcessor proc
called when resolution phase finishes
void GNUNET_DNSPARSER_free_packet(struct GNUNET_DNSPARSER_Packet *p)
Free memory taken by a packet.
Definition: dnsparser.c:854
This is a supplemental record.
struct GNUNET_RESOLVER_RequestHandle * GNUNET_RESOLVER_ip_get(const char *hostname, int af, struct GNUNET_TIME_Relative timeout, GNUNET_RESOLVER_AddressCallback callback, void *callback_cls)
Convert a string to one or more IP addresses.
Definition: resolver_api.c:939
char * name
The name to resolve.
struct GNUNET_DNSPARSER_Record * additional_records
Array of all additional answers in the packet, must contain "num_additional_records" entries...
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
#define GNUNET_DNSPARSER_TYPE_MX
unsigned int num_answers
Number of answers in the packet, should be 0 for queries.
uint64_t abs_value_us
The actual value.
uint16_t id
Unique identifier for the request/response.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
Handle to a currently pending resolution.
void * proc_cls
closure passed to proc
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
#define GNUNET_DNSPARSER_TYPE_PTR
#define GNUNET_GNSRECORD_TYPE_LEHO
legacy hostnames
#define GNUNET_DNSPARSER_TYPE_SOA
char * name
Name of the record that the query is for (0-terminated).
char * hostname
For NS, CNAME and PTR records, this is the uncompressed 0-terminated hostname.
static struct GNUNET_OS_Process * p
Helper process we started.
Definition: gnunet-qr.c:59
struct GNUNET_DNSPARSER_SoaRecord * soa
SOA data for SOA records.
unsigned int num_additional_records
Number of additional records in the packet, should be 0 for queries.
struct GNUNET_RESOLVER_RequestHandle * std_resolve
Handle for standard DNS resolution, NULL if none is active.
struct GNUNET_DNSPARSER_Packet * GNUNET_DNSPARSER_parse(const char *udp_payload, size_t udp_payload_length)
Parse a UDP payload of a DNS packet in to a nice struct for further processing and manipulation...
Definition: dnsparser.c:656
struct AuthorityChain * ac_tail
DLL to store the authority chain.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1296
int record_type
Desired type for the resolution.
static char buf[2048]
union GNUNET_DNSPARSER_Record::@24 data
Payload of the record (which one of these is valid depends on the &#39;type&#39;).
int GNUNET_DNSPARSER_builder_add_soa(char *dst, size_t dst_len, size_t *off, const struct GNUNET_DNSPARSER_SoaRecord *soa)
Add an SOA record to the UDP packet at the given location.
Definition: dnsparser.c:1077
struct GNUNET_SCHEDULER_Task * task_id
ID of a task associated with the resolution process.
A DNS response record.
struct GNUNET_DNSPARSER_Record * authority_records
Array of all authority records in the packet, must contain "num_authority_records" entries...
size_t name_resolution_pos
Current offset in name where we are resolving.
#define DNS_LOOKUP_TIMEOUT
Default timeout for DNS lookups.
size_t data_len
Number of bytes in data.
void * data
Binary record data.
int GNUNET_DNSPARSER_builder_add_mx(char *dst, size_t dst_len, size_t *off, const struct GNUNET_DNSPARSER_MxRecord *mx)
Add an MX record to the UDP packet at the given location.
Definition: dnsparser.c:1001
unsigned int num_authority_records
Number of authoritative answers in the packet, should be 0 for queries.
struct GNUNET_DNSSTUB_RequestSocket * dns_request
Socket for a DNS request, NULL if none is active.
struct GNUNET_TIME_Absolute expiration_time
When does the record expire?
static void fail_resolution(struct GNS_ResolverHandle *rh)
Function called to asynchronously fail a resolution.
uint16_t original_dns_id
16 bit random ID we used in the dns_request.
struct GNUNET_DNSPARSER_MxRecord * mx
MX data for MX records.
#define GNUNET_DNSPARSER_TYPE_AAAA
void GNUNET_DNSSTUB_resolve_cancel(struct GNUNET_DNSSTUB_RequestSocket *rs)
Cancel DNS resolution.
Definition: dnsstub.c:540
#define GNUNET_DNSPARSER_TYPE_NS
Easy-to-process, parsed version of a DNS packet.
#define GNUNET_log(kind,...)
This expiration time of the record is a relative time (not an absolute time).
int GNUNET_DNSPARSER_builder_add_name(char *dst, size_t dst_len, size_t *off, const char *name)
Add a DNS name to the UDP packet at the given location, converting the name to IDNA notation as neces...
Definition: dnsparser.c:889
char * leho
Legacy Hostname to use if we encountered GNS2DNS record and thus can deduct the LEHO from that transi...
#define GNUNET_DNSPARSER_TYPE_SRV
struct GNUNET_DNSPARSER_RawRecord raw
Raw data for all other types.
#define GNUNET_DNSPARSER_TYPE_A
static void add_dns_result(struct GNS_ResolverHandle *rh, uint64_t expiration_time, uint32_t record_type, size_t data_size, const void *data)
Add a result from DNS to the records to be returned to the application.
#define GNUNET_free(ptr)
Wrapper around free.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:972
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◆ recursive_dns_resolution()

static void recursive_dns_resolution ( struct GNS_ResolverHandle rh)
static

Perform recursive DNS resolution.

Asks the given DNS resolver to resolve "rh->dns_name", possibly recursively proceeding following NS delegations, CNAMES, etc., until 'rh->loop_limiter' bounds us or we find the answer.

Parameters
rhresolution information

Definition at line 1175 of file gnunet-service-gns_resolver.c.

References Gns2DnsPending::ac, GNS_ResolverHandle::ac_tail, AuthorityChain::authority_info, AuthorityChain::dns_authority, DNS_LOOKUP_TIMEOUT, GNS_ResolverHandle::dns_request, dns_result_parser(), GNUNET_DNSPARSER_Query::dns_traffic_class, GNUNET_DNSPARSER_Packet::flags, AuthorityChain::gns_authority, GNS_resolver_lookup_cancel_(), GNUNET_assert, GNUNET_break, GNUNET_CRYPTO_QUALITY_NONCE, GNUNET_CRYPTO_random_u32(), GNUNET_DNSPARSER_free_packet(), GNUNET_DNSPARSER_pack(), GNUNET_DNSSTUB_resolve(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_new, GNUNET_NO, GNUNET_OK, GNUNET_SCHEDULER_add_delayed(), GNUNET_SCHEDULER_add_now(), GNUNET_strdup, GNUNET_SYSERR, GNUNET_TUN_DNS_CLASS_INTERNET, GNUNET_TUN_DNS_OPCODE_QUERY, GNUNET_DNSPARSER_Packet::id, AuthorityChain::label, GNS_ResolverHandle::leho, GNUNET_DNSPARSER_Query::name, GNUNET_DNSPARSER_Packet::num_queries, GNUNET_TUN_DnsFlags::opcode, GNS_ResolverHandle::original_dns_id, p, GNS_ResolverHandle::proc, GNS_ResolverHandle::proc_cls, GNUNET_DNSPARSER_Packet::queries, GNS_ResolverHandle::record_type, GNUNET_TUN_DnsFlags::recursion_desired, ret, GNS_ResolverHandle::task_id, timeout_resolution(), and GNUNET_DNSPARSER_Query::type.

Referenced by recursive_resolution().

1176 {
1177  struct AuthorityChain *ac;
1178  struct GNUNET_DNSPARSER_Query *query;
1179  struct GNUNET_DNSPARSER_Packet *p;
1180  char *dns_request;
1181  size_t dns_request_length;
1182  int ret;
1183 
1184  ac = rh->ac_tail;
1185  GNUNET_assert (NULL != ac);
1187  "Starting DNS lookup for `%s'\n",
1188  ac->label);
1190  query = GNUNET_new (struct GNUNET_DNSPARSER_Query);
1191  query->name = GNUNET_strdup (ac->label);
1192  query->type = rh->record_type;
1194  p = GNUNET_new (struct GNUNET_DNSPARSER_Packet);
1195  p->queries = query;
1196  p->num_queries = 1;
1198  UINT16_MAX);
1200  p->flags.recursion_desired = 1;
1201  ret = GNUNET_DNSPARSER_pack (p,
1202  1024,
1203  &dns_request,
1204  &dns_request_length);
1205  if (GNUNET_OK != ret)
1206  {
1207  GNUNET_break (0);
1208  rh->proc (rh->proc_cls,
1209  0,
1210  NULL);
1211  GNUNET_assert (NULL == rh->task_id);
1213  rh);
1214  }
1215  else
1216  {
1217  rh->original_dns_id = p->id;
1218  GNUNET_assert (NULL != ac->authority_info.dns_authority.dns_handle);
1219  GNUNET_assert (NULL == rh->dns_request);
1220  rh->leho = GNUNET_strdup (ac->label);
1222  ac->authority_info.dns_authority.dns_handle,
1223  dns_request,
1224  dns_request_length,
1226  rh);
1229  rh);
1230  }
1231  if (GNUNET_SYSERR != ret)
1232  GNUNET_free (dns_request);
1234 }
uint16_t type
See GNUNET_DNSPARSER_TYPE_*.
static void GNS_resolver_lookup_cancel_(void *cls)
Wrapper around GNS_resolver_lookup_cancel() as a task.
static void timeout_resolution(void *cls)
Function called when a resolution times out.
uint32_t GNUNET_CRYPTO_random_u32(enum GNUNET_CRYPTO_Quality mode, uint32_t i)
Produce a random value.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
int GNUNET_DNSPARSER_pack(const struct GNUNET_DNSPARSER_Packet *p, uint16_t max, char **buf, size_t *buf_length)
Given a DNS packet p, generate the corresponding UDP payload.
Definition: dnsparser.c:1257
char * label
label/name corresponding to the authority
uint16_t id
DNS ID (to match replies to requests).
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
GNS_ResultProcessor proc
called when resolution phase finishes
void GNUNET_DNSPARSER_free_packet(struct GNUNET_DNSPARSER_Packet *p)
Free memory taken by a packet.
Definition: dnsparser.c:854
#define GNUNET_new(type)
Allocate a struct or union of the given type.
int gns_authority
GNUNET_YES if the authority was a GNS authority, GNUNET_NO if the authority was a DNS authority...
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
void * proc_cls
closure passed to proc
uint16_t dns_traffic_class
See GNUNET_TUN_DNS_CLASS_*.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed(struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1269
static struct GNUNET_OS_Process * p
Helper process we started.
Definition: gnunet-qr.c:59
struct AuthorityChain * ac_tail
DLL to store the authority chain.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1296
int record_type
Desired type for the resolution.
Randomness for IVs etc.
unsigned int recursion_desired
Set to 1 if recursion is desired (client -> server)
DLL to hold the authority chain we had to pass in the resolution process.
unsigned int opcode
See GNUNET_TUN_DNS_OPCODE_ defines.
struct GNUNET_SCHEDULER_Task * task_id
ID of a task associated with the resolution process.
struct GNUNET_DNSPARSER_Query * queries
Array of all queries in the packet, must contain "num_queries" entries.
struct GNUNET_DNSSTUB_RequestSocket * GNUNET_DNSSTUB_resolve(struct GNUNET_DNSSTUB_Context *ctx, const void *request, size_t request_len, GNUNET_DNSSTUB_ResultCallback rc, void *rc_cls)
Perform DNS resolution using our default IP from init.
Definition: dnsstub.c:504
#define DNS_LOOKUP_TIMEOUT
Default timeout for DNS lookups.
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
#define GNUNET_TUN_DNS_CLASS_INTERNET
A few common DNS classes (ok, only one is common, but I list a couple more to make it clear what we&#39;r...
struct GNUNET_DNSSTUB_RequestSocket * dns_request
Socket for a DNS request, NULL if none is active.
uint16_t original_dns_id
16 bit random ID we used in the dns_request.
Easy-to-process, parsed version of a DNS packet.
static void dns_result_parser(void *cls, const struct GNUNET_TUN_DnsHeader *dns, size_t dns_len)
Function called with the result of a DNS resolution.
#define GNUNET_log(kind,...)
char * name
Name of the record that the query is for (0-terminated).
#define GNUNET_TUN_DNS_OPCODE_QUERY
unsigned int num_queries
Number of queries in the packet.
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
struct GNUNET_TUN_DnsFlags flags
Bitfield of DNS flags.
char * leho
Legacy Hostname to use if we encountered GNS2DNS record and thus can deduct the LEHO from that transi...
struct AuthorityChain::@19::@20 dns_authority
#define GNUNET_free(ptr)
Wrapper around free.
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◆ handle_gns_cname_result()

static void handle_gns_cname_result ( struct GNS_ResolverHandle rh,
const char *  cname 
)
static

We encountered a CNAME record during our resolution.

Merge it into our chain.

Parameters
rhresolution we are performing
cnamevalue of the cname record we got for the current authority chain tail

Definition at line 1246 of file gnunet-service-gns_resolver.c.

References Gns2DnsPending::ac, GNS_ResolverHandle::ac_head, GNS_ResolverHandle::ac_tail, AuthorityChain::authority_info, DNS_LOOKUP_TIMEOUT, AuthorityChain::gns_authority, GNS_get_tld(), GNUNET_asprintf(), GNUNET_CONTAINER_DLL_insert_tail, GNUNET_DNSPARSER_TYPE_A, GNUNET_DNSPARSER_TYPE_AAAA, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_GNSRECORD_zkey_to_pkey(), GNUNET_log, GNUNET_new, GNUNET_OK, GNUNET_RESOLVER_ip_get(), GNUNET_RESOLVER_request_cancel(), GNUNET_SCHEDULER_add_now(), GNUNET_strdup, GNUNET_strndup, GNUNET_YES, handle_dns_result(), handle_gns_resolution_result(), AuthorityChain::label, GNS_ResolverHandle::name, GNS_ResolverHandle::name_resolution_pos, GNS_ResolverHandle::record_type, recursive_resolution(), res, resolver_lookup_get_next_label(), Gns2DnsPending::rh, AuthorityChain::rh, GNS_ResolverHandle::std_resolve, GNS_ResolverHandle::task_id, and zone.

Referenced by handle_gns_resolution_result(), and recursive_cname_resolution().

1248 {
1249  size_t nlen;
1250  char *res;
1251  const char *tld;
1252  struct AuthorityChain *ac;
1253  int af;
1255 
1256  nlen = strlen (cname);
1257  tld = GNS_get_tld (cname);
1258  if (0 == strcmp ("+", tld))
1259  {
1260  /* CNAME resolution continues relative to current domain */
1261  if (0 == rh->name_resolution_pos)
1262  {
1263  res = GNUNET_strndup (cname, nlen - 2);
1264  rh->name_resolution_pos = nlen - 2;
1265  }
1266  else
1267  {
1268  GNUNET_asprintf (&res,
1269  "%.*s.%.*s",
1270  (int) rh->name_resolution_pos,
1271  rh->name,
1272  (int) (nlen - 2),
1273  cname);
1274  rh->name_resolution_pos = strlen (res);
1275  }
1276  GNUNET_free (rh->name);
1277  rh->name = res;
1278  ac = GNUNET_new (struct AuthorityChain);
1279  ac->rh = rh;
1280  ac->gns_authority = GNUNET_YES;
1284  /* add AC to tail */
1286  rh->ac_tail,
1287  ac);
1289  rh);
1290  return;
1291  }
1293  {
1294  /* CNAME resolution continues relative to current domain */
1295  if (0 == rh->name_resolution_pos)
1296  {
1297  GNUNET_asprintf (&res,
1298  "%.*s",
1299  (int) (strlen (cname) - (strlen (tld) + 1)),
1300  cname);
1301  }
1302  else
1303  {
1304  GNUNET_asprintf (&res,
1305  "%.*s.%.*s",
1306  (int) rh->name_resolution_pos,
1307  rh->name,
1308  (int) (strlen (cname) - (strlen (tld) + 1)),
1309  cname);
1310  }
1311  rh->name_resolution_pos = strlen (res);
1312  GNUNET_free (rh->name);
1313  rh->name = res;
1314  ac = GNUNET_new (struct AuthorityChain);
1315  ac->rh = rh;
1316  ac->gns_authority = GNUNET_YES;
1319  /* add AC to tail */
1321  rh->ac_tail,
1322  ac);
1324  rh);
1325  return;
1326  }
1327 
1329  "Got CNAME `%s' from GNS for `%s'\n",
1330  cname,
1331  rh->name);
1332  if (NULL != rh->std_resolve)
1333  {
1335  "Multiple CNAME results from GNS resolving `%s'! Not really allowed...\n",
1336  rh->name);
1338  }
1339  /* name is absolute, go to DNS */
1340  GNUNET_free (rh->name);
1341  rh->name = GNUNET_strdup (cname);
1342  rh->name_resolution_pos = strlen (rh->name);
1343  switch (rh->record_type)
1344  {
1346  af = AF_INET;
1347  break;
1348 
1350  af = AF_INET6;
1351  break;
1352 
1353  default:
1354  af = AF_UNSPEC;
1355  break;
1356  }
1358  "Doing standard DNS lookup for `%s'\n",
1359  rh->name);
1360 
1362  af,
1365  rh);
1366 }
void GNUNET_RESOLVER_request_cancel(struct GNUNET_RESOLVER_RequestHandle *rh)
Cancel a request that is still pending with the resolver.
static void recursive_resolution(void *cls)
Task scheduled to continue with the resolution process.
int GNUNET_GNSRECORD_zkey_to_pkey(const char *zkey, struct GNUNET_IDENTITY_PublicKey *pkey)
Convert an absolute domain name to the respective public key.
static void handle_dns_result(void *cls, const struct sockaddr *addr, socklen_t addrlen)
We had to do a DNS lookup.
const char * GNS_get_tld(const char *name)
Obtain the TLD of the given name.
char * label
label/name corresponding to the authority
struct GNUNET_RESOLVER_RequestHandle * GNUNET_RESOLVER_ip_get(const char *hostname, int af, struct GNUNET_TIME_Relative timeout, GNUNET_RESOLVER_AddressCallback callback, void *callback_cls)
Convert a string to one or more IP addresses.
Definition: resolver_api.c:939
#define GNUNET_new(type)
Allocate a struct or union of the given type.
char * name
The name to resolve.
int gns_authority
GNUNET_YES if the authority was a GNS authority, GNUNET_NO if the authority was a DNS authority...
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
struct AuthorityChain * ac_head
DLL to store the authority chain.
static char * zone
Name of the zone we manage.
static char * resolver_lookup_get_next_label(struct GNS_ResolverHandle *rh)
Get the next, rightmost label from the name that we are trying to resolve, and update the resolution ...
struct GNUNET_RESOLVER_RequestHandle * std_resolve
Handle for standard DNS resolution, NULL if none is active.
struct AuthorityChain * ac_tail
DLL to store the authority chain.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1296
int record_type
Desired type for the resolution.
struct GNS_ResolverHandle * rh
Resolver handle this entry in the chain belongs to.
DLL to hold the authority chain we had to pass in the resolution process.
struct GNUNET_SCHEDULER_Task * task_id
ID of a task associated with the resolution process.
static int res
size_t name_resolution_pos
Current offset in name where we are resolving.
int int GNUNET_asprintf(char **buf, const char *format,...) __attribute__((format(printf
Like asprintf, just portable.
#define DNS_LOOKUP_TIMEOUT
Default timeout for DNS lookups.
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
#define GNUNET_CONTAINER_DLL_insert_tail(head, tail, element)
Insert an element at the tail of a DLL.
#define GNUNET_strndup(a, length)
Wrapper around GNUNET_xstrndup_.
An identity key as per LSD0001.
#define GNUNET_DNSPARSER_TYPE_AAAA
#define GNUNET_log(kind,...)
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
#define GNUNET_DNSPARSER_TYPE_A
#define GNUNET_free(ptr)
Wrapper around free.
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◆ handle_gns_resolution_result()

static void handle_gns_resolution_result ( void *  cls,
unsigned int  rd_count,
const struct GNUNET_GNSRECORD_Data rd 
)
static

Process a records that were decrypted from a block.

Parameters
clsclosure with the 'struct GNS_ResolverHandle'
rd_countnumber of entries in rd array
rdarray of records with data to store
clsclosure with the struct GNS_ResolverHandle
rd_countnumber of entries in rd array
rdarray of records with data to store

Definition at line 1953 of file gnunet-service-gns_resolver.c.

References _, Gns2DnsPending::ac, GNS_ResolverHandle::ac_head, GNS_ResolverHandle::ac_tail, AuthorityChain::authority_info, data, GNUNET_GNSRECORD_Data::data, GNUNET_GNSRECORD_Data::data_size, data_size, fail_resolution(), AuthorityChain::gns_authority, GNS_resolver_lookup_cancel_(), GNUNET_assert, GNUNET_break, GNUNET_break_op, GNUNET_CONTAINER_DLL_insert_tail, GNUNET_DNSPARSER_builder_add_mx(), GNUNET_DNSPARSER_builder_add_name(), GNUNET_DNSPARSER_builder_add_soa(), GNUNET_DNSPARSER_builder_add_srv(), GNUNET_DNSPARSER_free_mx(), GNUNET_DNSPARSER_free_soa(), GNUNET_DNSPARSER_free_srv(), GNUNET_DNSPARSER_parse_mx(), GNUNET_DNSPARSER_parse_name(), GNUNET_DNSPARSER_parse_soa(), GNUNET_DNSPARSER_parse_srv(), GNUNET_DNSPARSER_TYPE_A, GNUNET_DNSPARSER_TYPE_AAAA, GNUNET_DNSPARSER_TYPE_CNAME, GNUNET_DNSPARSER_TYPE_MX, GNUNET_DNSPARSER_TYPE_SOA, GNUNET_DNSPARSER_TYPE_SRV, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_GNS_EMPTY_LABEL_AT, GNUNET_GNSRECORD_identity_from_data(), GNUNET_GNSRECORD_records_get_size(), GNUNET_GNSRECORD_records_serialize(), GNUNET_GNSRECORD_TYPE_BOX, GNUNET_GNSRECORD_TYPE_EDKEY, GNUNET_GNSRECORD_TYPE_GNS2DNS, GNUNET_GNSRECORD_TYPE_PKEY, GNUNET_GNSRECORD_TYPE_VPN, GNUNET_GNSRECORD_z2s(), GNUNET_i2s(), GNUNET_log, GNUNET_malloc, GNUNET_new, GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_strdup, GNUNET_TIME_relative_to_absolute(), GNUNET_TUN_service_name_to_hash(), GNUNET_VPN_redirect_to_peer(), GNUNET_YES, handle_gns_cname_result(), AuthorityChain::label, GNUNET_DNSPARSER_SoaRecord::mname, GNUNET_DNSPARSER_MxRecord::mxhost, GNS_ResolverHandle::name, GNS_ResolverHandle::name_resolution_pos, GNUNET_TUN_GnsVpnRecord::peer, GNS_ResolverHandle::proc, GNS_ResolverHandle::proc_cls, GNUNET_TUN_GnsVpnRecord::proto, GNUNET_GNSRECORD_BoxRecord::protocol, GNS_ResolverHandle::protocol, pubkey, VpnContext::rd_count, VpnContext::rd_data, VpnContext::rd_data_size, GNUNET_GNSRECORD_Data::record_type, GNUNET_GNSRECORD_BoxRecord::record_type, GNS_ResolverHandle::record_type, recursive_cname_resolution(), recursive_gns2dns_resolution(), recursive_pkey_resolution(), recursive_resolution(), Gns2DnsPending::rh, AuthorityChain::rh, VpnContext::rh, GNUNET_DNSPARSER_SoaRecord::rname, GNUNET_GNSRECORD_BoxRecord::service, GNS_ResolverHandle::service, GNUNET_DNSPARSER_SrvRecord::target, GNS_ResolverHandle::task_id, translate_dot_plus(), vpn_allocation_cb(), GNS_ResolverHandle::vpn_ctx, VpnContext::vpn_request, and VPN_TIMEOUT.

Referenced by handle_dht_response(), handle_gns_cname_result(), handle_gns_namecache_resolution_result(), and vpn_allocation_cb().

1956 {
1957  struct GNS_ResolverHandle *rh = cls;
1958  char *cname;
1959  struct VpnContext *vpn_ctx;
1960  const struct GNUNET_TUN_GnsVpnRecord *vpn;
1961  const char *vname;
1962  struct GNUNET_HashCode vhash;
1963  int af;
1964  char scratch[UINT16_MAX];
1965  size_t scratch_off;
1966  size_t scratch_start;
1967  size_t off;
1968  struct GNUNET_GNSRECORD_Data rd_new[rd_count];
1969  unsigned int rd_off;
1970 
1972  "Resolution succeeded for `%s' in zone %s, got %u records\n",
1973  rh->ac_tail->label,
1975  rd_count);
1976  if (0 == rd_count)
1977  {
1979  _ ("GNS lookup failed (zero records found for `%s')\n"),
1980  rh->name);
1981  fail_resolution (rh);
1982  return;
1983  }
1984 
1985  if (0 == rh->name_resolution_pos)
1986  {
1987  /* top-level match, are we done yet? */
1988  if ((rd_count > 0) &&
1991  {
1992  off = 0;
1993  cname = GNUNET_DNSPARSER_parse_name (rd[0].data,
1994  rd[0].data_size,
1995  &off);
1996  if ((NULL == cname) ||
1997  (off != rd[0].data_size))
1998  {
1999  GNUNET_break_op (0);
2000  GNUNET_free (cname);
2001  fail_resolution (rh);
2002  return;
2003  }
2005  cname);
2006  GNUNET_free (cname);
2007  return;
2008  }
2009  /* If A/AAAA was requested, but we got a VPN
2010  record, we convert it to A/AAAA using GNUnet VPN */
2011  if ((GNUNET_DNSPARSER_TYPE_A == rh->record_type) ||
2013  {
2014  for (unsigned int i = 0; i < rd_count; i++)
2015  {
2016  switch (rd[i].record_type)
2017  {
2019  {
2020  af = (GNUNET_DNSPARSER_TYPE_A == rh->record_type) ? AF_INET :
2021  AF_INET6;
2022  if (sizeof(struct GNUNET_TUN_GnsVpnRecord) >
2023  rd[i].data_size)
2024  {
2025  GNUNET_break_op (0);
2026  fail_resolution (rh);
2027  return;
2028  }
2029  vpn = (const struct GNUNET_TUN_GnsVpnRecord *) rd[i].data;
2030  vname = (const char *) &vpn[1];
2031  if ('\0' != vname[rd[i].data_size - 1 - sizeof(struct
2033  ])
2034  {
2035  GNUNET_break_op (0);
2036  fail_resolution (rh);
2037  return;
2038  }
2040  &vhash);
2042  "Attempting VPN allocation for %s-%s (AF: %d, proto %d)\n",
2043  GNUNET_i2s (&vpn->peer),
2044  vname,
2045  (int) af,
2046  (int) ntohs (vpn->proto));
2047  vpn_ctx = GNUNET_new (struct VpnContext);
2048  rh->vpn_ctx = vpn_ctx;
2049  vpn_ctx->rh = rh;
2050  vpn_ctx->rd_data_size = GNUNET_GNSRECORD_records_get_size (rd_count,
2051  rd);
2052  if (vpn_ctx->rd_data_size < 0)
2053  {
2054  GNUNET_break_op (0);
2055  GNUNET_free (vpn_ctx);
2056  fail_resolution (rh);
2057  return;
2058  }
2059  vpn_ctx->rd_data = GNUNET_malloc ((size_t) vpn_ctx->rd_data_size);
2060  vpn_ctx->rd_count = rd_count;
2061  GNUNET_assert (vpn_ctx->rd_data_size ==
2063  rd,
2064  (size_t) vpn_ctx
2065  ->rd_data_size,
2066  vpn_ctx->rd_data));
2068  af,
2069  ntohs (
2070  vpn->proto),
2071  &vpn->peer,
2072  &vhash,
2074  VPN_TIMEOUT),
2075  &
2077  vpn_ctx);
2078  return;
2079  }
2080 
2082  {
2083  /* delegation to DNS */
2085  "Found GNS2DNS record, delegating to DNS!\n");
2086  if (GNUNET_OK ==
2088  rd_count,
2089  rd))
2090  return;
2091  else
2092  goto fail;
2093  }
2094 
2095  default:
2096  break;
2097  } /* end: switch */
2098  } /* end: for rd */
2099  } /* end: name_resolution_pos */
2100  /* convert relative names in record values to absolute names,
2101  using 'scratch' array for memory allocations */
2102  scratch_off = 0;
2103  rd_off = 0;
2104  for (unsigned int i = 0; i < rd_count; i++)
2105  {
2106  GNUNET_assert (rd_off <= i);
2107  if ((0 != rh->protocol) &&
2108  (0 != rh->service) &&
2110  continue; /* we _only_ care about boxed records */
2111 
2112  GNUNET_assert (rd_off < rd_count);
2113  rd_new[rd_off] = rd[i];
2114  /* Check if the embedded name(s) end in "+", and if so,
2115  replace the "+" with the zone at "ac_tail", changing the name
2116  to a ".ZONEKEY". The name is allocated on the 'scratch' array,
2117  so we can free it afterwards. */
2118  switch (rd[i].record_type)
2119  {
2121  {
2122  char *cname;
2123 
2124  off = 0;
2125  cname = GNUNET_DNSPARSER_parse_name (rd[i].data,
2126  rd[i].data_size,
2127  &off);
2128  if ((NULL == cname) ||
2129  (off != rd[i].data_size))
2130  {
2131  GNUNET_break_op (0); /* record not well-formed */
2132  }
2133  else
2134  {
2135  cname = translate_dot_plus (rh, cname);
2136  GNUNET_break (NULL != cname);
2137  scratch_start = scratch_off;
2138  if (GNUNET_OK !=
2140  sizeof(scratch),
2141  &scratch_off,
2142  cname))
2143  {
2144  GNUNET_break (0);
2145  }
2146  else
2147  {
2148  GNUNET_assert (rd_off < rd_count);
2149  rd_new[rd_off].data = &scratch[scratch_start];
2150  rd_new[rd_off].data_size = scratch_off - scratch_start;
2151  rd_off++;
2152  }
2153  }
2154  GNUNET_free (cname);
2155  }
2156  break;
2157 
2159  {
2160  struct GNUNET_DNSPARSER_SoaRecord *soa;
2161 
2162  off = 0;
2163  soa = GNUNET_DNSPARSER_parse_soa (rd[i].data,
2164  rd[i].data_size,
2165  &off);
2166  if ((NULL == soa) ||
2167  (off != rd[i].data_size))
2168  {
2169  GNUNET_break_op (0); /* record not well-formed */
2170  }
2171  else
2172  {
2173  soa->mname = translate_dot_plus (rh, soa->mname);
2174  soa->rname = translate_dot_plus (rh, soa->rname);
2175  scratch_start = scratch_off;
2176  if (GNUNET_OK !=
2178  sizeof(scratch),
2179  &scratch_off,
2180  soa))
2181  {
2182  GNUNET_break (0);
2183  }
2184  else
2185  {
2186  GNUNET_assert (rd_off < rd_count);
2187  rd_new[rd_off].data = &scratch[scratch_start];
2188  rd_new[rd_off].data_size = scratch_off - scratch_start;
2189  rd_off++;
2190  }
2191  }
2192  if (NULL != soa)
2194  }
2195  break;
2196 
2198  {
2199  struct GNUNET_DNSPARSER_MxRecord *mx;
2200 
2201  off = 0;
2202  mx = GNUNET_DNSPARSER_parse_mx (rd[i].data,
2203  rd[i].data_size,
2204  &off);
2205  if ((NULL == mx) ||
2206  (off != rd[i].data_size))
2207  {
2208  GNUNET_break_op (0); /* record not well-formed */
2209  }
2210  else
2211  {
2212  mx->mxhost = translate_dot_plus (rh, mx->mxhost);
2213  scratch_start = scratch_off;
2214  if (GNUNET_OK !=
2216  sizeof(scratch),
2217  &scratch_off,
2218  mx))
2219  {
2220  GNUNET_break (0);
2221  }
2222  else
2223  {
2224  GNUNET_assert (rd_off < rd_count);
2225  rd_new[rd_off].data = &scratch[scratch_start];
2226  rd_new[rd_off].data_size = scratch_off - scratch_start;
2227  rd_off++;
2228  }
2229  }
2230  if (NULL != mx)
2232  }
2233  break;
2234 
2236  {
2237  struct GNUNET_DNSPARSER_SrvRecord *srv;
2238 
2239  off = 0;
2240  srv = GNUNET_DNSPARSER_parse_srv (rd[i].data,
2241  rd[i].data_size,
2242  &off);
2243  if ((NULL == srv) ||
2244  (off != rd[i].data_size))
2245  {
2246  GNUNET_break_op (0); /* record not well-formed */
2247  }
2248  else
2249  {
2250  srv->target = translate_dot_plus (rh, srv->target);
2251  scratch_start = scratch_off;
2252  if (GNUNET_OK !=
2254  sizeof(scratch),
2255  &scratch_off,
2256  srv))
2257  {
2258  GNUNET_break (0);
2259  }
2260  else
2261  {
2262  GNUNET_assert (rd_off < rd_count);
2263  rd_new[rd_off].data = &scratch[scratch_start];
2264  rd_new[rd_off].data_size = scratch_off - scratch_start;
2265  rd_off++;
2266  }
2267  }
2268  if (NULL != srv)
2270  }
2271  break;
2272 
2275  {
2277  if (rd[i].data_size < sizeof(uint32_t))
2278  {
2279  GNUNET_break_op (0);
2280  break;
2281  }
2282  if (GNUNET_OK !=
2284  rd[i].data_size,
2285  rd[i].record_type,
2286  &pubkey))
2287  {
2288  GNUNET_break_op (0);
2289  break;
2290  }
2291  rd_off++;
2292  if (rd[i].record_type != rh->record_type)
2293  {
2294  /* try to resolve "@" */
2295  struct AuthorityChain *ac;
2296 
2297  ac = GNUNET_new (struct AuthorityChain);
2298  ac->rh = rh;
2299  ac->gns_authority = GNUNET_YES;
2303  rh->ac_tail,
2304  ac);
2306  rh);
2307  return;
2308  }
2309  }
2310  break;
2311 
2313  {
2314  /* delegation to DNS */
2316  {
2317  rd_off++;
2318  break; /* do not follow to DNS, we wanted the GNS2DNS record! */
2319  }
2321  "Found GNS2DNS record, delegating to DNS!\n");
2322  if (GNUNET_OK ==
2324  rd_count,
2325  rd))
2326  return;
2327  else
2328  goto fail;
2329  }
2330 
2332  {
2333  /* unbox SRV/TLSA records if a specific one was requested */
2334  if ((0 != rh->protocol) &&
2335  (0 != rh->service) &&
2336  (rd[i].data_size >= sizeof(struct GNUNET_GNSRECORD_BoxRecord)))
2337  {
2338  const struct GNUNET_GNSRECORD_BoxRecord *box;
2339 
2340  box = rd[i].data;
2341  if ((ntohs (box->protocol) == rh->protocol) &&
2342  (ntohs (box->service) == rh->service))
2343  {
2344  /* Box matches, unbox! */
2345  GNUNET_assert (rd_off < rd_count);
2346  rd_new[rd_off].record_type = ntohl (box->record_type);
2347  rd_new[rd_off].data_size -= sizeof(struct
2349  rd_new[rd_off].data = &box[1];
2350  rd_off++;
2351  }
2352  }
2353  else
2354  {
2355  /* no specific protocol/service specified, preserve all BOX
2356  records (for modern, GNS-enabled applications) */
2357  rd_off++;
2358  }
2359  break;
2360  }
2361 
2362  default:
2363  rd_off++;
2364  break;
2365  } /* end: switch */
2366  } /* end: for rd_count */
2367 
2368  /* yes, we are done, return result */
2370  "Returning GNS response for `%s' with %u answers\n",
2371  rh->ac_tail->label,
2372  rd_off);
2373  rh->proc (rh->proc_cls,
2374  rd_off,
2375  rd_new);
2377  rh);
2378  return;
2379  }
2380 
2381  switch (rd[0].record_type)
2382  {
2384  GNUNET_break_op (1 == rd_count); /* CNAME should be unique */
2386  &rd[0]);
2387  return;
2388 
2391  GNUNET_break_op (1 == rd_count); /* PKEY should be unique */
2393  &rd[0]);
2394  return;
2395 
2396  default:
2397  if (GNUNET_OK ==
2399  rd_count,
2400  rd))
2401  return;
2402  break;
2403  }
2404 fail:
2406  _ ("GNS lookup recursion failed (no delegation record found)\n"));
2407  fail_resolution (rh);
2408 }
void GNUNET_DNSPARSER_free_soa(struct GNUNET_DNSPARSER_SoaRecord *soa)
Free SOA information record.
Definition: dnsparser.c:108
#define GNUNET_GNSRECORD_TYPE_PKEY
WARNING: This header is generated! In order to add GNS record types, you must register them in GANA...
static struct GNUNET_VPN_Handle * vpn_handle
Our handle to the vpn service.
Information from SOA records (RFC 1035).
Payload of GNS VPN record.
GNUNET_NETWORK_STRUCT_END ssize_t GNUNET_GNSRECORD_records_get_size(unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
Calculate how many bytes we will need to serialize the given records.
uint16_t service
Service of the boxed record (aka port number), in NBO.
static void vpn_allocation_cb(void *cls, int af, const void *address)
Callback invoked from the VPN service once a redirection is available.
Record type used to box up SRV and TLSA records.
char * GNUNET_DNSPARSER_parse_name(const char *udp_payload, size_t udp_payload_length, size_t *off)
Parse name inside of a DNS query or record.
Definition: dnsparser.c:334
static void recursive_cname_resolution(struct GNS_ResolverHandle *rh, const struct GNUNET_GNSRECORD_Data *rd)
We found a CNAME record, perform recursive resolution on it.
char * mname
The domainname of the name server that was the original or primary source of data for this zone...
static void recursive_resolution(void *cls)
Task scheduled to continue with the resolution process.
#define GNUNET_GNS_EMPTY_LABEL_AT
String we use to indicate an empty label (top-level entry in the zone).
void GNUNET_DNSPARSER_free_srv(struct GNUNET_DNSPARSER_SrvRecord *srv)
Free SRV information record.
Definition: dnsparser.c:139
#define GNUNET_DNSPARSER_TYPE_CNAME
char * mxhost
Name of the mail server.
ssize_t GNUNET_GNSRECORD_records_serialize(unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd, size_t dest_size, char *dest)
Serialize the given records to the given destination buffer.
static void GNS_resolver_lookup_cancel_(void *cls)
Wrapper around GNS_resolver_lookup_cancel() as a task.
#define GNUNET_GNSRECORD_TYPE_GNS2DNS
Delegation to DNS.
struct GNUNET_TIME_Absolute GNUNET_TIME_relative_to_absolute(struct GNUNET_TIME_Relative rel)
Convert relative time to an absolute time in the future.
Definition: time.c:181
static size_t data_size
Number of bytes in data.
Definition: gnunet-abd.c:187
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
char * label
label/name corresponding to the authority
int GNUNET_DNSPARSER_builder_add_srv(char *dst, size_t dst_len, size_t *off, const struct GNUNET_DNSPARSER_SrvRecord *srv)
Add an SRV record to the UDP packet at the given location.
Definition: dnsparser.c:1118
#define GNUNET_GNSRECORD_TYPE_BOX
Boxed records (see TLSA/SRV handling in GNS)
GNS_ResultProcessor proc
called when resolution phase finishes
struct GNUNET_VPN_RedirectionRequest * vpn_request
Handle to the VPN request that we were performing.
#define VPN_TIMEOUT
Default timeout for VPN redirections.
struct GNUNET_DNSPARSER_SoaRecord * GNUNET_DNSPARSER_parse_soa(const char *udp_payload, size_t udp_payload_length, size_t *off)
Parse a DNS SOA record.
Definition: dnsparser.c:391
size_t data_size
Number of bytes in data.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
char * name
The name to resolve.
int gns_authority
GNUNET_YES if the authority was a GNS authority, GNUNET_NO if the authority was a DNS authority...
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
#define GNUNET_DNSPARSER_TYPE_MX
Information from MX records (RFC 1035).
struct AuthorityChain * ac_head
DLL to store the authority chain.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
Handle to a currently pending resolution.
void * proc_cls
closure passed to proc
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
#define GNUNET_DNSPARSER_TYPE_SOA
int service
For SRV and TLSA records, the number of the service specified in the name.
const void * data
Binary value stored in the DNS record.
struct AuthorityChain * ac_tail
DLL to store the authority chain.
static int recursive_gns2dns_resolution(struct GNS_ResolverHandle *rh, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
We found one or more GNS2DNS records, perform recursive resolution on it.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
char * target
Hostname offering the service.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1296
#define GNUNET_GNSRECORD_TYPE_VPN
VPN resolution.
char * rname
A domainname which specifies the mailbox of the person responsible for this zone. ...
int record_type
Desired type for the resolution.
struct GNUNET_DNSPARSER_SrvRecord * GNUNET_DNSPARSER_parse_srv(const char *udp_payload, size_t udp_payload_length, size_t *off)
Parse a DNS SRV record.
Definition: dnsparser.c:477
static struct GNUNET_IDENTITY_PublicKey pubkey
Public key of the zone to look in.
int protocol
For SRV and TLSA records, the number of the protocol specified in the name.
struct GNS_ResolverHandle * rh
Resolver handle this entry in the chain belongs to.
void GNUNET_TUN_service_name_to_hash(const char *service_name, struct GNUNET_HashCode *hc)
Hash the service name of a hosted service to the hash code that is used to identify the service on th...
Definition: regex.c:814
DLL to hold the authority chain we had to pass in the resolution process.
int GNUNET_DNSPARSER_builder_add_soa(char *dst, size_t dst_len, size_t *off, const struct GNUNET_DNSPARSER_SoaRecord *soa)
Add an SOA record to the UDP packet at the given location.
Definition: dnsparser.c:1077
uint16_t protocol
Protocol of the boxed record (6 = TCP, 17 = UDP, etc.).
struct GNUNET_SCHEDULER_Task * task_id
ID of a task associated with the resolution process.
A 512-bit hashcode.
enum GNUNET_GenericReturnValue GNUNET_GNSRECORD_identity_from_data(const char *data, size_t data_size, uint32_t type, struct GNUNET_IDENTITY_PublicKey *key)
Build a #GNUNET_GNSRECORD_PublicKey from zone delegation resource record data.
struct GNUNET_DNSPARSER_MxRecord * GNUNET_DNSPARSER_parse_mx(const char *udp_payload, size_t udp_payload_length, size_t *off)
Parse a DNS MX record.
Definition: dnsparser.c:436
size_t name_resolution_pos
Current offset in name where we are resolving.
struct GNUNET_VPN_RedirectionRequest * GNUNET_VPN_redirect_to_peer(struct GNUNET_VPN_Handle *vh, int result_af, uint8_t protocol, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_HashCode *serv, struct GNUNET_TIME_Absolute expiration_time, GNUNET_VPN_AllocationCallback cb, void *cb_cls)
Tell the VPN that a forwarding to a particular peer offering a particular service is requested...
Definition: vpn_api.c:410
struct GNUNET_PeerIdentity peer
The peer to contact.
uint16_t proto
The protocol to use.
struct GNS_ResolverHandle * rh
Which resolution process are we processing.
int GNUNET_DNSPARSER_builder_add_mx(char *dst, size_t dst_len, size_t *off, const struct GNUNET_DNSPARSER_MxRecord *mx)
Add an MX record to the UDP packet at the given location.
Definition: dnsparser.c:1001
struct VpnContext * vpn_ctx
Handle to a VPN request, NULL if none is active.
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
#define GNUNET_CONTAINER_DLL_insert_tail(head, tail, element)
Insert an element at the tail of a DLL.
uint32_t record_type
GNS record type of the boxed record.
char * rd_data
Serialized records.
static char * translate_dot_plus(struct GNS_ResolverHandle *rh, char *name)
Expands a name ending in .
static void fail_resolution(struct GNS_ResolverHandle *rh)
Function called to asynchronously fail a resolution.
static void handle_gns_cname_result(struct GNS_ResolverHandle *rh, const char *cname)
We encountered a CNAME record during our resolution.
An identity key as per LSD0001.
uint32_t record_type
Type of the GNS/DNS record.
#define GNUNET_DNSPARSER_TYPE_AAAA
Closure for vpn_allocation_cb.
static void recursive_pkey_resolution(struct GNS_ResolverHandle *rh, const struct GNUNET_GNSRECORD_Data *rd)
We found a PKEY record, perform recursive resolution on it.
#define GNUNET_log(kind,...)
#define GNUNET_GNSRECORD_TYPE_EDKEY
Record type for EDKEY zone delegations.
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
int GNUNET_DNSPARSER_builder_add_name(char *dst, size_t dst_len, size_t *off, const char *name)
Add a DNS name to the UDP packet at the given location, converting the name to IDNA notation as neces...
Definition: dnsparser.c:889
ssize_t rd_data_size
Number of bytes in rd_data.
#define GNUNET_DNSPARSER_TYPE_SRV
uint32_t data
The data value.
const char * GNUNET_GNSRECORD_z2s(const struct GNUNET_IDENTITY_PublicKey *z)
Convert a zone key to a string (for printing debug messages).
void GNUNET_DNSPARSER_free_mx(struct GNUNET_DNSPARSER_MxRecord *mx)
Free MX information record.
Definition: dnsparser.c:154
#define GNUNET_DNSPARSER_TYPE_A
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
#define GNUNET_malloc(size)
Wrapper around malloc.
Information from SRV records (RFC 2782).
#define GNUNET_free(ptr)
Wrapper around free.
unsigned int rd_count
Number of records serialized in rd_data.
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◆ vpn_allocation_cb()

static void vpn_allocation_cb ( void *  cls,
int  af,
const void *  address 
)
static

Callback invoked from the VPN service once a redirection is available.

Provides the IP address that can now be used to reach the requested destination. Replaces the "VPN" record with the respective A/AAAA record and continues processing.

Parameters
clsclosure
afaddress family, AF_INET or AF_INET6; AF_UNSPEC on error; will match 'result_af' from the request
addressIP address (struct in_addr or struct in_addr6, depending on 'af') that the VPN allocated for the redirection; traffic to this IP will now be redirected to the specified target peer; NULL on error

Definition at line 1397 of file gnunet-service-gns_resolver.c.

References _, GNUNET_TIME_Absolute::abs_value_us, address, GNUNET_GNSRECORD_Data::data, GNUNET_GNSRECORD_Data::data_size, GNUNET_GNSRECORD_Data::expiration_time, GNUNET_GNSRECORD_Data::flags, GNUNET_assert, GNUNET_DNSPARSER_TYPE_A, GNUNET_DNSPARSER_TYPE_AAAA, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_GNSRECORD_records_deserialize(), GNUNET_GNSRECORD_TYPE_VPN, GNUNET_log, GNUNET_OK, GNUNET_TIME_relative_to_absolute(), handle_gns_resolution_result(), GNS_ResolverHandle::name, GNUNET_GNSRECORD_Data::record_type, Gns2DnsPending::rh, VpnContext::rh, GNS_ResolverHandle::vpn_ctx, and VPN_TIMEOUT.

Referenced by handle_gns_resolution_result().

1400 {
1401  struct VpnContext *vpn_ctx = cls;
1402  struct GNS_ResolverHandle *rh = vpn_ctx->rh;
1403  struct GNUNET_GNSRECORD_Data rd[vpn_ctx->rd_count];
1404  unsigned int i;
1405 
1406  vpn_ctx->vpn_request = NULL;
1407  rh->vpn_ctx = NULL;
1410  (size_t) vpn_ctx->rd_data_size,
1411  vpn_ctx->rd_data,
1412  vpn_ctx->rd_count,
1413  rd));
1414  for (i = 0; i < vpn_ctx->rd_count; i++)
1415  {
1417  {
1418  switch (af)
1419  {
1420  case AF_INET:
1421  rd[i].record_type = GNUNET_DNSPARSER_TYPE_A;
1422  rd[i].data_size = sizeof(struct in_addr);
1423  rd[i].expiration_time = GNUNET_TIME_relative_to_absolute (
1425  rd[i].flags = 0;
1426  rd[i].data = address;
1427  break;
1428 
1429  case AF_INET6:
1430  rd[i].record_type = GNUNET_DNSPARSER_TYPE_AAAA;
1431  rd[i].expiration_time = GNUNET_TIME_relative_to_absolute (
1433  rd[i].flags = 0;
1434  rd[i].data = address;
1435  rd[i].data_size = sizeof(struct in6_addr);
1436  break;
1437 
1438  default:
1439  GNUNET_assert (0);
1440  }
1441  break;
1442  }
1443  }
1444  GNUNET_assert (i < vpn_ctx->rd_count);
1445  if (0 == vpn_ctx->rd_count)
1447  _ ("VPN returned empty result for `%s'\n"),
1448  rh->name);
1450  vpn_ctx->rd_count,
1451  rd);
1452  GNUNET_free (vpn_ctx->rd_data);
1453  GNUNET_free (vpn_ctx);
1454 }
struct GNUNET_TIME_Absolute GNUNET_TIME_relative_to_absolute(struct GNUNET_TIME_Relative rel)
Convert relative time to an absolute time in the future.
Definition: time.c:181
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct GNUNET_VPN_RedirectionRequest * vpn_request
Handle to the VPN request that we were performing.
#define VPN_TIMEOUT
Default timeout for VPN redirections.
char * name
The name to resolve.
int GNUNET_GNSRECORD_records_deserialize(size_t len, const char *src, unsigned int rd_count, struct GNUNET_GNSRECORD_Data *dest)
Deserialize the given records to the given destination.
uint64_t abs_value_us
The actual value.
Handle to a currently pending resolution.
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
#define GNUNET_GNSRECORD_TYPE_VPN
VPN resolution.
struct GNS_ResolverHandle * rh
Which resolution process are we processing.
struct VpnContext * vpn_ctx
Handle to a VPN request, NULL if none is active.
char * rd_data
Serialized records.
uint32_t record_type
Type of the GNS/DNS record.
#define GNUNET_DNSPARSER_TYPE_AAAA
Closure for vpn_allocation_cb.
static void handle_gns_resolution_result(void *cls, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
Process a records that were decrypted from a block.
#define GNUNET_log(kind,...)
ssize_t rd_data_size
Number of bytes in rd_data.
static char * address
GNS address for this phone.
#define GNUNET_DNSPARSER_TYPE_A
#define GNUNET_free(ptr)
Wrapper around free.
unsigned int rd_count
Number of records serialized in rd_data.
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◆ continue_with_gns2dns()

static void continue_with_gns2dns ( struct AuthorityChain ac)
static

We have resolved one or more of the nameservers for a GNS2DNS lookup.

Once we have some of them, begin using the DNSSTUB resolver.

Parameters
accontext for GNS2DNS resolution

Definition at line 1465 of file gnunet-service-gns_resolver.c.

References AuthorityChain::authority_info, AuthorityChain::dns_authority, fail_resolution(), GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_log, GNUNET_NO, GNUNET_SCHEDULER_add_now(), GNUNET_YES, AuthorityChain::label, recursive_resolution(), Gns2DnsPending::rh, AuthorityChain::rh, and GNS_ResolverHandle::task_id.

Referenced by handle_gns2dns_ip(), handle_gns2dns_result(), and recursive_gns2dns_resolution().

1466 {
1467  struct GNS_ResolverHandle *rh = ac->rh;
1468 
1469  if ((NULL != ac->authority_info.dns_authority.gp_head) &&
1470  (GNUNET_NO == ac->authority_info.dns_authority.found))
1471  return; /* more pending and none found yet */
1472  if (GNUNET_NO == ac->authority_info.dns_authority.found)
1473  {
1475  "Failed to resolve DNS server for `%s' in GNS2DNS resolution\n",
1476  ac->authority_info.dns_authority.name);
1477  fail_resolution (rh);
1478  return;
1479  }
1480  if (GNUNET_NO != ac->authority_info.dns_authority.launched)
1481  return; /* already running, do not launch again! */
1482  /* recurse */
1483  ac->authority_info.dns_authority.launched = GNUNET_YES;
1485  "Will continue resolution using DNS to resolve `%s'\n",
1486  ac->label);
1487  GNUNET_assert (NULL == rh->task_id);
1489  rh);
1490 }
static void recursive_resolution(void *cls)
Task scheduled to continue with the resolution process.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
char * label
label/name corresponding to the authority
Handle to a currently pending resolution.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1296
struct GNS_ResolverHandle * rh
Resolver handle this entry in the chain belongs to.
struct GNUNET_SCHEDULER_Task * task_id
ID of a task associated with the resolution process.
static void fail_resolution(struct GNS_ResolverHandle *rh)
Function called to asynchronously fail a resolution.
#define GNUNET_log(kind,...)
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
struct AuthorityChain::@19::@20 dns_authority
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◆ handle_gns2dns_result()

static void handle_gns2dns_result ( void *  cls,
unsigned int  rd_count,
const struct GNUNET_GNSRECORD_Data rd 
)
static

We've resolved the IP address for the DNS resolver to use after encountering a GNS2DNS record.

Parameters
clsthe struct Gns2DnsPending used for this request
rd_countnumber of records in rd
rdaddresses for the DNS resolver (presumably)

Definition at line 1502 of file gnunet-service-gns_resolver.c.

References Gns2DnsPending::ac, AuthorityChain::authority_info, continue_with_gns2dns(), GNUNET_GNSRECORD_Data::data, data_size, AuthorityChain::dns_authority, GNUNET_break_op, GNUNET_CONTAINER_DLL_insert, GNUNET_CONTAINER_DLL_remove, GNUNET_DNSPARSER_TYPE_A, GNUNET_DNSPARSER_TYPE_AAAA, GNUNET_DNSSTUB_add_dns_sa(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_memcpy, GNUNET_OK, GNUNET_YES, and Gns2DnsPending::rh.

Referenced by recursive_gns2dns_resolution().

1505 {
1506  struct Gns2DnsPending *gp = cls;
1507  struct AuthorityChain *ac = gp->ac;
1508 
1510  ac->authority_info.dns_authority.gp_tail,
1511  gp);
1512  /* enable cleanup of 'rh' handle that automatically comes after we return,
1513  and which expects 'rh' to be in the #rlh_head DLL. */
1514  if (NULL != gp->rh)
1515  {
1517  rlh_tail,
1518  gp->rh);
1519  gp->rh = NULL;
1520  }
1521  GNUNET_free (gp);
1523  "Received %u results for IP address of DNS server for GNS2DNS transition\n",
1524  rd_count);
1525  /* find suitable A/AAAA record */
1526  for (unsigned int j = 0; j < rd_count; j++)
1527  {
1528  switch (rd[j].record_type)
1529  {
1531  {
1532  struct sockaddr_in v4;
1533 
1534  if (sizeof(struct in_addr) != rd[j].data_size)
1535  {
1536  GNUNET_break_op (0);
1537  continue;
1538  }
1539  memset (&v4,
1540  0,
1541  sizeof(v4));
1542  v4.sin_family = AF_INET;
1543  v4.sin_port = htons (53);
1544 #if HAVE_SOCKADDR_IN_SIN_LEN
1545  v4.sin_len = (u_char) sizeof(v4);
1546 #endif
1547  GNUNET_memcpy (&v4.sin_addr,
1548  rd[j].data,
1549  sizeof(struct in_addr));
1550  if (GNUNET_OK ==
1552  ac->authority_info.dns_authority.dns_handle,
1553  (const struct sockaddr *) &v4))
1555  break;
1556  }
1557 
1559  {
1560  struct sockaddr_in6 v6;
1561 
1562  if (sizeof(struct in6_addr) != rd[j].data_size)
1563  {
1564  GNUNET_break_op (0);
1565  continue;
1566  }
1567  /* FIXME: might want to check if we support IPv6 here,
1568  and otherwise skip this one and hope we find another */
1569  memset (&v6,
1570  0,
1571  sizeof(v6));
1572  v6.sin6_family = AF_INET6;
1573  v6.sin6_port = htons (53);
1574 #if HAVE_SOCKADDR_IN_SIN_LEN
1575  v6.sin6_len = (u_char) sizeof(v6);
1576 #endif
1577  GNUNET_memcpy (&v6.sin6_addr,
1578  rd[j].data,
1579  sizeof(struct in6_addr));
1580  if (GNUNET_OK ==
1582  ac->authority_info.dns_authority.dns_handle,
1583  (const struct sockaddr *) &v6))
1585  break;
1586  }
1587 
1588  default:
1589  break;
1590  }
1591  }
1592  continue_with_gns2dns (ac);
1593 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
struct GNS_ResolverHandle * rh
Handle for the resolution of the IP part of the GNS2DNS record.
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
static size_t data_size
Number of bytes in data.
Definition: gnunet-abd.c:187
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
const void * data
Binary value stored in the DNS record.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
DLL to hold the authority chain we had to pass in the resolution process.
struct AuthorityChain * ac
Context this activity belongs with.
Element of a resolution process for looking up the responsible DNS server hostname in a GNS2DNS recur...
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
static void continue_with_gns2dns(struct AuthorityChain *ac)
We have resolved one or more of the nameservers for a GNS2DNS lookup.
#define GNUNET_DNSPARSER_TYPE_AAAA
#define GNUNET_log(kind,...)
static struct GNS_ResolverHandle * rlh_head
Head of resolver lookup list.
static struct GNS_ResolverHandle * rlh_tail
Tail of resolver lookup list.
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
#define GNUNET_DNSPARSER_TYPE_A
int GNUNET_DNSSTUB_add_dns_sa(struct GNUNET_DNSSTUB_Context *ctx, const struct sockaddr *sa)
Add nameserver for use by the DNSSTUB.
Definition: dnsstub.c:643
struct AuthorityChain::@19::@20 dns_authority
#define GNUNET_free(ptr)
Wrapper around free.
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◆ handle_gns2dns_ip()

static void handle_gns2dns_ip ( void *  cls,
const struct sockaddr *  addr,
socklen_t  addrlen 
)
static

Function called by the resolver for each address obtained from DNS.

Parameters
clsclosure, a struct Gns2DnsPending *
addrone of the addresses of the host, NULL for the last address
addrlenlength of addr

Definition at line 1604 of file gnunet-service-gns_resolver.c.

References Gns2DnsPending::ac, AuthorityChain::authority_info, continue_with_gns2dns(), AuthorityChain::dns_authority, GNUNET_CONTAINER_DLL_remove, GNUNET_DNSSTUB_add_dns_sa(), GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_memcpy, GNUNET_OK, GNUNET_YES, and Gns2DnsPending::num_results.

Referenced by recursive_gns2dns_resolution().

1607 {
1608  struct Gns2DnsPending *gp = cls;
1609  struct AuthorityChain *ac = gp->ac;
1610  struct sockaddr_storage ss;
1611  struct sockaddr_in *v4;
1612  struct sockaddr_in6 *v6;
1613 
1614  if (NULL == addr)
1615  {
1616  /* DNS resolution finished */
1617  if (0 == gp->num_results)
1619  "Failed to use DNS to resolve name of DNS resolver\n");
1621  ac->authority_info.dns_authority.gp_tail,
1622  gp);
1623  GNUNET_free (gp);
1624  continue_with_gns2dns (ac);
1625  return;
1626  }
1627  GNUNET_memcpy (&ss,
1628  addr,
1629  addrlen);
1630  switch (ss.ss_family)
1631  {
1632  case AF_INET:
1633  v4 = (struct sockaddr_in *) &ss;
1634  v4->sin_port = htons (53);
1635  gp->num_results++;
1636  break;
1637 
1638  case AF_INET6:
1639  v6 = (struct sockaddr_in6 *) &ss;
1640  v6->sin6_port = htons (53);
1641  gp->num_results++;
1642  break;
1643 
1644  default:
1646  "Unsupported AF %d\n",
1647  ss.ss_family);
1648  return;
1649  }
1650  if (GNUNET_OK ==
1652  (struct sockaddr *) &ss))
1654 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
unsigned int num_results
How many results did we get?
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
DLL to hold the authority chain we had to pass in the resolution process.
struct AuthorityChain * ac
Context this activity belongs with.
Element of a resolution process for looking up the responsible DNS server hostname in a GNS2DNS recur...
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
static void continue_with_gns2dns(struct AuthorityChain *ac)
We have resolved one or more of the nameservers for a GNS2DNS lookup.
#define GNUNET_log(kind,...)
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
int GNUNET_DNSSTUB_add_dns_sa(struct GNUNET_DNSSTUB_Context *ctx, const struct sockaddr *sa)
Add nameserver for use by the DNSSTUB.
Definition: dnsstub.c:643
struct AuthorityChain::@19::@20 dns_authority
#define GNUNET_free(ptr)
Wrapper around free.
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◆ recursive_cname_resolution()

static void recursive_cname_resolution ( struct GNS_ResolverHandle rh,
const struct GNUNET_GNSRECORD_Data rd 
)
static

We found a CNAME record, perform recursive resolution on it.

Parameters
rhresolution handle
rdrecord with CNAME to resolve recursively

Definition at line 1664 of file gnunet-service-gns_resolver.c.

References GNUNET_GNSRECORD_Data::data, GNUNET_GNSRECORD_Data::data_size, fail_resolution(), GNUNET_break_op, GNUNET_DNSPARSER_parse_name(), GNUNET_free, and handle_gns_cname_result().

Referenced by handle_gns_resolution_result().

1666 {
1667  char *cname;
1668  size_t off;
1669 
1670  off = 0;
1671  cname = GNUNET_DNSPARSER_parse_name (rd->data,
1672  rd->data_size,
1673  &off);
1674  if ((NULL == cname) ||
1675  (off != rd->data_size))
1676  {
1677  GNUNET_break_op (0); /* record not well-formed */
1678  GNUNET_free (cname);
1679  fail_resolution (rh);
1680  return;
1681  }
1683  cname);
1684  GNUNET_free (cname);
1685 }
char * GNUNET_DNSPARSER_parse_name(const char *udp_payload, size_t udp_payload_length, size_t *off)
Parse name inside of a DNS query or record.
Definition: dnsparser.c:334
size_t data_size
Number of bytes in data.
const void * data
Binary value stored in the DNS record.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
static void fail_resolution(struct GNS_ResolverHandle *rh)
Function called to asynchronously fail a resolution.
static void handle_gns_cname_result(struct GNS_ResolverHandle *rh, const char *cname)
We encountered a CNAME record during our resolution.
#define GNUNET_free(ptr)
Wrapper around free.
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◆ recursive_pkey_resolution()

static void recursive_pkey_resolution ( struct GNS_ResolverHandle rh,
const struct GNUNET_GNSRECORD_Data rd 
)
static

We found a PKEY record, perform recursive resolution on it.

Parameters
rhresolution handle
rdrecord with PKEY to resolve recursively

Definition at line 1695 of file gnunet-service-gns_resolver.c.

References Gns2DnsPending::ac, GNS_ResolverHandle::ac_head, GNS_ResolverHandle::ac_tail, AuthorityChain::authority_info, GNUNET_GNSRECORD_Data::data, GNUNET_GNSRECORD_Data::data_size, fail_resolution(), AuthorityChain::gns_authority, GNUNET_break_op, GNUNET_CONTAINER_DLL_insert_tail, GNUNET_GNSRECORD_identity_from_data(), GNUNET_new, GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_YES, AuthorityChain::label, GNUNET_GNSRECORD_Data::record_type, recursive_resolution(), resolver_lookup_get_next_label(), Gns2DnsPending::rh, AuthorityChain::rh, and GNS_ResolverHandle::task_id.

Referenced by handle_gns_resolution_result().

1697 {
1698  struct AuthorityChain *ac;
1699  struct GNUNET_IDENTITY_PublicKey auth;
1700 
1701  /* delegation to another zone */
1703  rd->data_size,
1704  rd->record_type,
1705  &auth))
1706  {
1707  GNUNET_break_op (0);
1708  fail_resolution (rh);
1709  return;
1710  }
1711  /* expand authority chain */
1712  ac = GNUNET_new (struct AuthorityChain);
1713  ac->rh = rh;
1714  ac->gns_authority = GNUNET_YES;
1715  ac->authority_info.gns_authority = auth;
1717  /* add AC to tail */
1719  rh->ac_tail,
1720  ac);
1721  /* recurse */
1723  rh);
1724 }
static void recursive_resolution(void *cls)
Task scheduled to continue with the resolution process.
char * label
label/name corresponding to the authority
size_t data_size
Number of bytes in data.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
int gns_authority
GNUNET_YES if the authority was a GNS authority, GNUNET_NO if the authority was a DNS authority...
struct AuthorityChain * ac_head
DLL to store the authority chain.
const void * data
Binary value stored in the DNS record.
static char * resolver_lookup_get_next_label(struct GNS_ResolverHandle *rh)
Get the next, rightmost label from the name that we are trying to resolve, and update the resolution ...
struct AuthorityChain * ac_tail
DLL to store the authority chain.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1296
struct GNS_ResolverHandle * rh
Resolver handle this entry in the chain belongs to.
DLL to hold the authority chain we had to pass in the resolution process.
struct GNUNET_SCHEDULER_Task * task_id
ID of a task associated with the resolution process.
enum GNUNET_GenericReturnValue GNUNET_GNSRECORD_identity_from_data(const char *data, size_t data_size, uint32_t type, struct GNUNET_IDENTITY_PublicKey *key)
Build a #GNUNET_GNSRECORD_PublicKey from zone delegation resource record data.
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
#define GNUNET_CONTAINER_DLL_insert_tail(head, tail, element)
Insert an element at the tail of a DLL.
static void fail_resolution(struct GNS_ResolverHandle *rh)
Function called to asynchronously fail a resolution.
An identity key as per LSD0001.
uint32_t record_type
Type of the GNS/DNS record.
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
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◆ recursive_gns2dns_resolution()

static int recursive_gns2dns_resolution ( struct GNS_ResolverHandle rh,
unsigned int  rd_count,
const struct GNUNET_GNSRECORD_Data rd 
)
static

We found one or more GNS2DNS records, perform recursive resolution on it.

(to be precise, one or more records in rd is GNS2DNS, there may be others, so this function still needs to check which ones are GNS2DNS).

Parameters
rhresolution handle
rd_countlength of the rd array
rdrecord with PKEY to resolve recursively
Returns
GNUNET_OK if this worked, GNUNET_SYSERR if no GNS2DNS records were in rd

Records other than GNS2DNS not allowed

Definition at line 1738 of file gnunet-service-gns_resolver.c.

References _, Gns2DnsPending::ac, GNS_ResolverHandle::ac_head, GNS_ResolverHandle::ac_tail, AuthorityChain::authority_info, GNS_ResolverHandle::authority_zone, continue_with_gns2dns(), data, data_size, AuthorityChain::dns_authority, Gns2DnsPending::dns_rh, GNS_get_tld(), GNUNET_asprintf(), GNUNET_assert, GNUNET_break, GNUNET_break_op, GNUNET_CONTAINER_DLL_insert, GNUNET_CONTAINER_DLL_insert_tail, GNUNET_DNSPARSER_MAX_NAME_LENGTH, GNUNET_DNSPARSER_parse_name(), GNUNET_DNSSTUB_add_dns_ip(), GNUNET_DNSSTUB_start(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_GNS_LO_DEFAULT, GNUNET_GNSRECORD_TYPE_ANY, GNUNET_GNSRECORD_TYPE_GNS2DNS, GNUNET_GNSRECORD_zkey_to_pkey(), GNUNET_log, GNUNET_new, GNUNET_OK, GNUNET_RESOLVER_ip_get(), GNUNET_SCHEDULER_add_now(), GNUNET_strdup, GNUNET_SYSERR, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, handle_gns2dns_ip(), handle_gns2dns_result(), AuthorityChain::label, GNS_ResolverHandle::loop_limiter, GNS_ResolverHandle::loop_threshold, GNS_ResolverHandle::name, GNS_ResolverHandle::name_resolution_pos, ns, GNS_ResolverHandle::options, GNS_ResolverHandle::proc, GNS_ResolverHandle::proc_cls, GNS_ResolverHandle::record_type, Gns2DnsPending::rh, AuthorityChain::rh, start_resolver_lookup(), GNS_ResolverHandle::task_id, translate_dot_plus(), and zone.

Referenced by handle_gns_resolution_result().

1741 {
1742  struct AuthorityChain *ac;
1743  const char *tld;
1744  char *ns;
1745 
1746  ns = NULL;
1747  /* expand authority chain */
1748  ac = GNUNET_new (struct AuthorityChain);
1749  ac->rh = rh;
1750  ac->authority_info.dns_authority.dns_handle = GNUNET_DNSSTUB_start (4);
1751 
1752  for (unsigned int i = 0; i < rd_count; i++)
1753  {
1754  char *ip;
1755  char *n;
1756  size_t off;
1757  struct Gns2DnsPending *gp;
1759  struct sockaddr_in v4;
1760  struct sockaddr_in6 v6;
1761 
1762  if (GNUNET_GNSRECORD_TYPE_GNS2DNS != rd[i].record_type)
1763  {
1767  if (NULL != ns)
1768  GNUNET_free (ns);
1769  return GNUNET_SYSERR;
1770  }
1771  off = 0;
1772  n = GNUNET_DNSPARSER_parse_name (rd[i].data,
1773  rd[i].data_size,
1774  &off);
1775  ip = GNUNET_strdup (&((const char *) rd[i].data)[off]);
1776  if ((NULL == n) ||
1777  (NULL == ip))
1778  {
1779  GNUNET_break_op (0);
1780  if (NULL != n)
1781  GNUNET_free (n);
1782  if (NULL != ip)
1783  GNUNET_free (ip);
1784  continue;
1785  }
1786 
1787  off += strlen (ip) + 1;
1788 
1789  if (off != rd[i].data_size)
1790  {
1791  GNUNET_break_op (0);
1792  continue;
1793  }
1794  /* resolve 'ip' to determine the IP(s) of the DNS
1795  resolver to use for lookup of 'ns' */
1796  if (NULL != ns)
1797  {
1798  if (0 != strcasecmp (ns,
1799  n))
1800  {
1801  /* NS values must all be the same for all GNS2DNS records,
1802  anything else leads to insanity */
1803  GNUNET_break_op (0);
1804  GNUNET_free (n);
1805  GNUNET_free (ip);
1806  continue;
1807  }
1808  GNUNET_free (n);
1809  }
1810  else
1811  {
1812  ns = n;
1813  }
1814 
1815  /* check if 'ip' is already an IPv4/IPv6 address */
1816  if ((1 == inet_pton (AF_INET,
1817  ip,
1818  &v4)) ||
1819  (1 == inet_pton (AF_INET6,
1820  ip,
1821  &v6)))
1822  {
1825  ac->authority_info.dns_authority.dns_handle,
1826  ip));
1828  GNUNET_free (ip);
1829  continue;
1830  }
1831  tld = GNS_get_tld (ip);
1832  if ((0 != strcmp (tld, "+")) &&
1834  {
1835  /* 'ip' is a DNS name */
1836  gp = GNUNET_new (struct Gns2DnsPending);
1837  gp->ac = ac;
1839  ac->authority_info.dns_authority.gp_tail,
1840  gp);
1841  gp->dns_rh = GNUNET_RESOLVER_ip_get (ip,
1842  AF_UNSPEC,
1845  gp);
1846  GNUNET_free (ip);
1847  continue;
1848  }
1849  /* 'ip' should be a GNS name */
1850  gp = GNUNET_new (struct Gns2DnsPending);
1851  gp->ac = ac;
1853  ac->authority_info.dns_authority.gp_tail,
1854  gp);
1855  gp->rh = GNUNET_new (struct GNS_ResolverHandle);
1856  if (0 == strcmp (tld, "+"))
1857  {
1858  ip = translate_dot_plus (rh,
1859  ip);
1860  tld = GNS_get_tld (ip);
1861  if (GNUNET_OK !=
1863  &zone))
1864  {
1865  GNUNET_break_op (0);
1866  GNUNET_free (ip);
1867  continue;
1868  }
1869  }
1870  gp->rh->authority_zone = zone;
1872  "Resolving `%s' to determine IP address of DNS server for GNS2DNS transition for `%s'\n",
1873  ip,
1874  ns);
1875  gp->rh->name = ip;
1876  gp->rh->name_resolution_pos = strlen (ip) - strlen (tld) - 1;
1877  gp->rh->proc = &handle_gns2dns_result;
1878  gp->rh->proc_cls = gp;
1881  gp->rh->loop_limiter = rh->loop_limiter + 1;
1882  gp->rh->loop_threshold = rh->loop_threshold;
1883  gp->rh->task_id
1885  gp->rh);
1886  } /* end 'for all records' */
1887 
1888  if (NULL == ns)
1889  {
1890  /* not a single GNS2DNS record found */
1891  GNUNET_free (ac);
1892  return GNUNET_SYSERR;
1893  }
1895  strcpy (ac->authority_info.dns_authority.name,
1896  ns);
1897  /* for DNS recursion, the label is the full DNS name,
1898  created from the remainder of the GNS name and the
1899  name in the NS record */
1900  GNUNET_asprintf (&ac->label,
1901  "%.*s%s%s",
1902  (int) rh->name_resolution_pos,
1903  rh->name,
1904  (0 != rh->name_resolution_pos) ? "." : "",
1905  ns);
1906  GNUNET_free (ns);
1907 
1908  {
1909  /* the GNS name is UTF-8 and may include multibyte chars.
1910  * We have to convert the combined name to a DNS-compatible IDNA.
1911  */
1912  char *tmp = ac->label;
1913 
1914  if (IDNA_SUCCESS != idna_to_ascii_8z (tmp,
1915  &ac->label,
1916  IDNA_ALLOW_UNASSIGNED))
1917  {
1919  _ ("Name `%s' cannot be converted to IDNA."),
1920  tmp);
1921  GNUNET_free (tmp);
1922  GNUNET_free (ac);
1923  return GNUNET_SYSERR;
1924  }
1925  GNUNET_free (tmp);
1926  }
1927 
1929  rh->ac_tail,
1930  ac);
1931  if (strlen (ac->label) > GNUNET_DNSPARSER_MAX_NAME_LENGTH)
1932  {
1934  _ ("GNS lookup resulted in DNS name that is too long (`%s')\n"),
1935  ac->label);
1936  GNUNET_free (ac->label);
1937  GNUNET_free (ac);
1938  return GNUNET_SYSERR;
1939  }
1940  continue_with_gns2dns (ac);
1941  return GNUNET_OK;
1942 }
struct GNS_ResolverHandle * rh
Handle for the resolution of the IP part of the GNS2DNS record.
char * GNUNET_DNSPARSER_parse_name(const char *udp_payload, size_t udp_payload_length, size_t *off)
Parse name inside of a DNS query or record.
Definition: dnsparser.c:334
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
int GNUNET_GNSRECORD_zkey_to_pkey(const char *zkey, struct GNUNET_IDENTITY_PublicKey *pkey)
Convert an absolute domain name to the respective public key.
const char * GNS_get_tld(const char *name)
Obtain the TLD of the given name.
#define GNUNET_GNSRECORD_TYPE_GNS2DNS
Delegation to DNS.
static size_t data_size
Number of bytes in data.
Definition: gnunet-abd.c:187
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
char * label
label/name corresponding to the authority
#define GNUNET_GNSRECORD_TYPE_ANY
Record type indicating any record/&#39;*&#39;.
int GNUNET_DNSSTUB_add_dns_ip(struct GNUNET_DNSSTUB_Context *ctx, const char *dns_ip)
Add nameserver for use by the DNSSTUB.
Definition: dnsstub.c:591
unsigned int loop_threshold
Maximum value of loop_limiter allowed by client.
GNS_ResultProcessor proc
called when resolution phase finishes
struct GNUNET_RESOLVER_RequestHandle * GNUNET_RESOLVER_ip_get(const char *hostname, int af, struct GNUNET_TIME_Relative timeout, GNUNET_RESOLVER_AddressCallback callback, void *callback_cls)
Convert a string to one or more IP addresses.
Definition: resolver_api.c:939
#define GNUNET_new(type)
Allocate a struct or union of the given type.
char * name
The name to resolve.
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
struct AuthorityChain * ac_head
DLL to store the authority chain.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
Handle to a currently pending resolution.
void * proc_cls
closure passed to proc
static void start_resolver_lookup(void *cls)
Begin the resolution process from &#39;name&#39;, starting with the identification of the zone specified by &#39;...
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
static char * zone
Name of the zone we manage.
#define GNUNET_DNSPARSER_MAX_NAME_LENGTH
Maximum length of a name in DNS.
struct AuthorityChain * ac_tail
DLL to store the authority chain.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
struct GNUNET_DNSSTUB_Context * GNUNET_DNSSTUB_start(unsigned int num_sockets)
Start a DNS stub resolver.
Definition: dnsstub.c:564
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1296
static struct GNUNET_NAMESTORE_Handle * ns
Handle to the namestore.
Definition: gnunet-abd.c:41
int record_type
Desired type for the resolution.
struct GNS_ResolverHandle * rh
Resolver handle this entry in the chain belongs to.
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
DLL to hold the authority chain we had to pass in the resolution process.
struct AuthorityChain * ac
Context this activity belongs with.
struct GNUNET_SCHEDULER_Task * task_id
ID of a task associated with the resolution process.
size_t name_resolution_pos
Current offset in name where we are resolving.
int int GNUNET_asprintf(char **buf, const char *format,...) __attribute__((format(printf
Like asprintf, just portable.
static void handle_gns2dns_result(void *cls, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
We&#39;ve resolved the IP address for the DNS resolver to use after encountering a GNS2DNS record...
Element of a resolution process for looking up the responsible DNS server hostname in a GNS2DNS recur...
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
#define GNUNET_CONTAINER_DLL_insert_tail(head, tail, element)
Insert an element at the tail of a DLL.
static void continue_with_gns2dns(struct AuthorityChain *ac)
We have resolved one or more of the nameservers for a GNS2DNS lookup.
static char * translate_dot_plus(struct GNS_ResolverHandle *rh, char *name)
Expands a name ending in .
static void handle_gns2dns_ip(void *cls, const struct sockaddr *addr, socklen_t addrlen)
Function called by the resolver for each address obtained from DNS.
struct GNUNET_IDENTITY_PublicKey authority_zone
The top-level GNS authoritative zone to query.
An identity key as per LSD0001.
struct GNUNET_RESOLVER_RequestHandle * dns_rh
Handle for DNS resolution of the DNS nameserver.
#define GNUNET_log(kind,...)
Defaults, look in cache, then in DHT.
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
uint32_t data
The data value.
unsigned int loop_limiter
We increment the loop limiter for each step in a recursive resolution.
struct AuthorityChain::@19::@20 dns_authority
#define GNUNET_free(ptr)
Wrapper around free.
enum GNUNET_GNS_LocalOptions options
Use only cache.
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◆ namecache_cache_continuation()

static void namecache_cache_continuation ( void *  cls,
int32_t  success,
const char *  emsg 
)
static

Function called once the namestore has completed the request for caching a block.

Parameters
clsclosure with the struct CacheOps
successGNUNET_OK on success
emsgerror message

Definition at line 2420 of file gnunet-service-gns_resolver.c.

References _, GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_OK, and CacheOps::namecache_qe_cache.

Referenced by handle_dht_response().

2423 {
2424  struct CacheOps *co = cls;
2425 
2426  co->namecache_qe_cache = NULL;
2427  if (GNUNET_OK != success)
2429  _ ("Failed to cache GNS resolution: %s\n"),
2430  emsg);
2432  co_tail,
2433  co);
2434  GNUNET_free (co);
2435 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
struct GNUNET_NAMECACHE_QueueEntry * namecache_qe_cache
Pending Namestore caching task.
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
Active namestore caching operations.
#define GNUNET_log(kind,...)
static struct CacheOps * co_tail
Organized in a DLL.
#define GNUNET_free(ptr)
Wrapper around free.
static struct CacheOps * co_head
Organized in a DLL.
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◆ handle_dht_response()

static void handle_dht_response ( void *  cls,
struct GNUNET_TIME_Absolute  exp,
const struct GNUNET_HashCode key,
const struct GNUNET_PeerIdentity get_path,
unsigned int  get_path_length,
const struct GNUNET_PeerIdentity put_path,
unsigned int  put_path_length,
enum GNUNET_BLOCK_Type  type,
size_t  size,
const void *  data 
)
static

Iterator called on each result obtained for a DHT operation that expects a reply.

Parameters
clsclosure with the struct GNS_ResolverHandle
expwhen will this value expire
keykey of the result
get_pathpeers on reply path (or NULL if not recorded) [0] = datastore's first neighbor, [length - 1] = local peer
get_path_lengthnumber of entries in get_path
put_pathpeers on the PUT path (or NULL if not recorded) [0] = origin, [length - 1] = datastore
put_path_lengthnumber of entries in put_path
typetype of the result
sizenumber of bytes in data
datapointer to the result data

Definition at line 2456 of file gnunet-service-gns_resolver.c.

References Gns2DnsPending::ac, GNS_ResolverHandle::ac_tail, AuthorityChain::authority_info, data, GNS_ResolverHandle::dht_heap_node, disable_cache, fail_resolution(), GNS_ResolverHandle::get_handle, AuthorityChain::gns_authority, GNUNET_break, GNUNET_break_op, GNUNET_CONTAINER_DLL_insert, GNUNET_CONTAINER_heap_remove_node(), GNUNET_DHT_get_stop(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_GNSRECORD_block_decrypt(), GNUNET_GNSRECORD_block_get_expiration(), GNUNET_GNSRECORD_block_get_size(), GNUNET_log, GNUNET_NAMECACHE_block_cache(), GNUNET_new, GNUNET_OK, GNUNET_STRINGS_absolute_time_to_string(), GNUNET_TIME_absolute_get_remaining(), GNUNET_YES, handle_gns_resolution_result(), AuthorityChain::label, GNS_ResolverHandle::name, namecache_cache_continuation(), CacheOps::namecache_qe_cache, and Gns2DnsPending::rh.

Referenced by start_dht_request().

2466 {
2467  struct GNS_ResolverHandle *rh = cls;
2468  struct AuthorityChain *ac = rh->ac_tail;
2469  const struct GNUNET_GNSRECORD_Block *block;
2470  struct CacheOps *co;
2471 
2472  (void) exp;
2473  (void) key;
2474  (void) get_path;
2475  (void) get_path_length;
2476  (void) put_path;
2477  (void) put_path_length;
2478  (void) type;
2480  rh->get_handle = NULL;
2482  rh->dht_heap_node = NULL;
2484  "Handling response from the DHT\n");
2485  if (size < sizeof(struct GNUNET_GNSRECORD_Block))
2486  {
2487  /* how did this pass DHT block validation!? */
2488  GNUNET_break (0);
2489  fail_resolution (rh);
2490  return;
2491  }
2492  block = data;
2493  if (size != GNUNET_GNSRECORD_block_get_size (block))
2494  {
2495  /* how did this pass DHT block validation!? */
2496  GNUNET_break (0);
2497  fail_resolution (rh);
2498  return;
2499  }
2501  "Decrypting DHT block of size %lu for `%s', expires %s\n",
2503  rh->name,
2505  if (GNUNET_OK !=
2508  ac->label,
2510  rh))
2511  {
2512  GNUNET_break_op (0); /* block was ill-formed */
2513  fail_resolution (rh);
2514  return;
2515  }
2518  rel_value_us)
2519  {
2521  "Received expired block from the DHT, will not cache it.\n");
2522  return;
2523  }
2524  if (GNUNET_YES == disable_cache)
2525  return;
2526  /* Cache well-formed blocks */
2528  "Caching response from the DHT in namecache\n");
2529  co = GNUNET_new (struct CacheOps);
2531  block,
2532  &
2534  co);
2536  co_tail,
2537  co);
2538 }
static struct GNUNET_NAMECACHE_Handle * namecache_handle
Our handle to the namecache service.
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
struct GNUNET_NAMECACHE_QueueEntry * namecache_qe_cache
Pending Namestore caching task.
struct GNUNET_DHT_GetHandle * get_handle
Handle for DHT lookups.
char * label
label/name corresponding to the authority
#define GNUNET_new(type)
Allocate a struct or union of the given type.
char * name
The name to resolve.
int gns_authority
GNUNET_YES if the authority was a GNS authority, GNUNET_NO if the authority was a DNS authority...
static int disable_cache
Use namecache.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
static void namecache_cache_continuation(void *cls, int32_t success, const char *emsg)
Function called once the namestore has completed the request for caching a block. ...
Handle to a currently pending resolution.
Active namestore caching operations.
size_t GNUNET_GNSRECORD_block_get_size(const struct GNUNET_GNSRECORD_Block *block)
Returns the length of this block in bytes.
struct AuthorityChain * ac_tail
DLL to store the authority chain.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
DLL to hold the authority chain we had to pass in the resolution process.
struct GNUNET_NAMECACHE_QueueEntry * GNUNET_NAMECACHE_block_cache(struct GNUNET_NAMECACHE_Handle *h, const struct GNUNET_GNSRECORD_Block *block, GNUNET_NAMECACHE_ContinuationWithStatus cont, void *cont_cls)
Store an item in the namecache.
void GNUNET_DHT_get_stop(struct GNUNET_DHT_GetHandle *get_handle)
Stop async DHT-get.
Definition: dht_api.c:1155
struct GNUNET_CONTAINER_HeapNode * dht_heap_node
Heap node associated with this lookup.
static unsigned int size
Size of the "table".
Definition: peer.c:67
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
enum GNUNET_GenericReturnValue GNUNET_GNSRECORD_block_decrypt(const struct GNUNET_GNSRECORD_Block *block, const struct GNUNET_IDENTITY_PublicKey *zone_key, const char *label, GNUNET_GNSRECORD_RecordCallback proc, void *proc_cls)
Decrypt block.
static void fail_resolution(struct GNS_ResolverHandle *rh)
Function called to asynchronously fail a resolution.
static void handle_gns_resolution_result(void *cls, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
Process a records that were decrypted from a block.
#define GNUNET_log(kind,...)
struct GNUNET_TIME_Relative GNUNET_TIME_absolute_get_remaining(struct GNUNET_TIME_Absolute future)
Given a timestamp in the future, how much time remains until then?
Definition: time.c:232
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model
static struct CacheOps * co_tail
Organized in a DLL.
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
const char * GNUNET_STRINGS_absolute_time_to_string(struct GNUNET_TIME_Absolute t)
Like asctime, except for GNUnet time.
Definition: strings.c:758
struct GNUNET_TIME_Absolute GNUNET_GNSRECORD_block_get_expiration(const struct GNUNET_GNSRECORD_Block *block)
Returns the expiration of a block.
uint32_t data
The data value.
void * GNUNET_CONTAINER_heap_remove_node(struct GNUNET_CONTAINER_HeapNode *node)
Removes a node from the heap.
static struct CacheOps * co_head
Organized in a DLL.
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◆ start_dht_request()

static void start_dht_request ( struct GNS_ResolverHandle rh,
const struct GNUNET_HashCode query 
)
static

Initiate a DHT query for a set of GNS records.

Parameters
rhresolution handle
querykey to use in the DHT lookup

Definition at line 2548 of file gnunet-service-gns_resolver.c.

References DHT_GNS_REPLICATION_LEVEL, GNS_ResolverHandle::dht_heap_node, fail_resolution(), GNS_ResolverHandle::get_handle, GNUNET_assert, GNUNET_BLOCK_TYPE_GNS_NAMERECORD, GNUNET_CONTAINER_heap_get_size(), GNUNET_CONTAINER_heap_insert(), GNUNET_CONTAINER_heap_remove_root(), GNUNET_DHT_get_start(), GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, GNUNET_TIME_absolute_get(), handle_dht_response(), and max_allowed_background_queries.

Referenced by handle_namecache_block_response(), and recursive_gns_resolution_namecache().

2550 {
2551  struct GNS_ResolverHandle *rx;
2552 
2553  GNUNET_assert (NULL == rh->get_handle);
2556  query,
2559  NULL, 0,
2560  &handle_dht_response, rh);
2562  rh,
2564  abs_value_us);
2567  {
2568  /* fail longest-standing DHT request */
2570  rx->dht_heap_node = NULL;
2571  GNUNET_assert (NULL != rx);
2572  fail_resolution (rx);
2573  }
2574 }
static struct GNUNET_CONTAINER_Heap * dht_lookup_heap
Heap for limiting parallel DHT lookups.
struct GNUNET_CONTAINER_HeapNode * GNUNET_CONTAINER_heap_insert(struct GNUNET_CONTAINER_Heap *heap, void *element, GNUNET_CONTAINER_HeapCostType cost)
Inserts a new element into the heap.
#define DHT_GNS_REPLICATION_LEVEL
DHT replication level.
struct GNUNET_DHT_GetHandle * get_handle
Handle for DHT lookups.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static unsigned long long max_allowed_background_queries
Maximum amount of parallel queries to the DHT.
Handle to a currently pending resolution.
static struct GNUNET_DHT_Handle * dht_handle
Resolver handle to the dht.
Block for storing record data.
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_get(void)
Get the current time.
Definition: time.c:86
unsigned int GNUNET_CONTAINER_heap_get_size(const struct GNUNET_CONTAINER_Heap *heap)
Get the current size of the heap.
struct GNUNET_CONTAINER_HeapNode * dht_heap_node
Heap node associated with this lookup.
static void fail_resolution(struct GNS_ResolverHandle *rh)
Function called to asynchronously fail a resolution.
struct GNUNET_DHT_GetHandle * GNUNET_DHT_get_start(struct GNUNET_DHT_Handle *handle, enum GNUNET_BLOCK_Type type, const struct GNUNET_HashCode *key, uint32_t desired_replication_level, enum GNUNET_DHT_RouteOption options, const void *xquery, size_t xquery_size, GNUNET_DHT_GetIterator iter, void *iter_cls)
Perform an asynchronous GET operation on the DHT identified.
Definition: dht_api.c:1067
void * GNUNET_CONTAINER_heap_remove_root(struct GNUNET_CONTAINER_Heap *heap)
Remove root of the heap.
Each peer along the way should look at &#39;enc&#39; (otherwise only the k-peers closest to the key should lo...
static void handle_dht_response(void *cls, struct GNUNET_TIME_Absolute exp, const struct GNUNET_HashCode *key, const struct GNUNET_PeerIdentity *get_path, unsigned int get_path_length, const struct GNUNET_PeerIdentity *put_path, unsigned int put_path_length, enum GNUNET_BLOCK_Type type, size_t size, const void *data)
Iterator called on each result obtained for a DHT operation that expects a reply. ...
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◆ handle_gns_namecache_resolution_result()

static void handle_gns_namecache_resolution_result ( void *  cls,
unsigned int  rd_count,
const struct GNUNET_GNSRECORD_Data rd 
)
static

Process a records that were decrypted from a block that we got from the namecache.

Simply calls handle_gns_resolution_result().

Parameters
clsclosure with the struct GNS_ResolverHandle
rd_countnumber of entries in rd array
rdarray of records with data to store

Definition at line 2586 of file gnunet-service-gns_resolver.c.

References _, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, handle_gns_resolution_result(), GNS_ResolverHandle::name, and Gns2DnsPending::rh.

Referenced by handle_namecache_block_response().

2589 {
2590  struct GNS_ResolverHandle *rh = cls;
2591 
2592  if (0 == rd_count)
2594  _ ("GNS namecache returned empty result for `%s'\n"),
2595  rh->name);
2597  rd_count,
2598  rd);
2599 }
char * name
The name to resolve.
Handle to a currently pending resolution.
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
static void handle_gns_resolution_result(void *cls, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
Process a records that were decrypted from a block.
#define GNUNET_log(kind,...)
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◆ handle_namecache_block_response()

static void handle_namecache_block_response ( void *  cls,
const struct GNUNET_GNSRECORD_Block block 
)
static

Process a record that was stored in the namecache.

Parameters
clsclosure with the struct GNS_ResolverHandle
blockblock that was stored in the namecache

Definition at line 2609 of file gnunet-service-gns_resolver.c.

References Gns2DnsPending::ac, GNS_ResolverHandle::ac_head, GNS_ResolverHandle::ac_tail, AuthorityChain::authority_info, fail_resolution(), AuthorityChain::gns_authority, GNUNET_assert, GNUNET_break_op, GNUNET_ERROR_TYPE_DEBUG, GNUNET_GNS_LO_DEFAULT, GNUNET_GNS_LO_LOCAL_MASTER, GNUNET_GNSRECORD_block_decrypt(), GNUNET_GNSRECORD_block_get_expiration(), GNUNET_GNSRECORD_query_from_public_key(), GNUNET_GNSRECORD_z2s(), GNUNET_h2s(), GNUNET_log, GNUNET_OK, GNUNET_TIME_absolute_get_remaining(), handle_gns_namecache_resolution_result(), AuthorityChain::label, GNS_ResolverHandle::namecache_qe, GNS_ResolverHandle::options, Gns2DnsPending::rh, and start_dht_request().

Referenced by recursive_gns_resolution_namecache().

2611 {
2612  struct GNS_ResolverHandle *rh = cls;
2613  struct AuthorityChain *ac = rh->ac_tail;
2614  const char *label = ac->label;
2615  const struct GNUNET_IDENTITY_PublicKey *auth =
2617  struct GNUNET_HashCode query;
2618 
2619  GNUNET_assert (NULL != rh->namecache_qe);
2620  rh->namecache_qe = NULL;
2621  if (((GNUNET_GNS_LO_DEFAULT == rh->options) ||
2622  ((GNUNET_GNS_LO_LOCAL_MASTER == rh->options) &&
2623  (ac != rh->ac_head))) &&
2624  ((NULL == block) ||
2627  rel_value_us)))
2628  {
2629  /* namecache knows nothing; try DHT lookup */
2631  label,
2632  &query);
2634  "Starting DHT lookup for `%s' in zone `%s' under key `%s'\n",
2635  ac->label,
2637  GNUNET_h2s (&query));
2638  start_dht_request (rh, &query);
2639  return;
2640  }
2641 
2642  if ((NULL == block) ||
2645  rel_value_us))
2646  {
2647  /* DHT not permitted and no local result, fail */
2649  "Resolution failed for `%s' in zone %s (DHT lookup not permitted by configuration)\n",
2650  ac->label,
2652  fail_resolution (rh);
2653  return;
2654  }
2656  "Received result from namecache for label `%s'\n",
2657  ac->label);
2658 
2659  if (GNUNET_OK !=
2661  auth,
2662  label,
2664  rh))
2665  {
2666  GNUNET_break_op (0); /* block was ill-formed */
2667  /* try DHT instead */
2669  label,
2670  &query);
2672  "Starting DHT lookup for `%s' in zone `%s' under key `%s'\n",
2673  ac->label,
2675  GNUNET_h2s (&query));
2676  start_dht_request (rh, &query);
2677  return;
2678  }
2679 }
For the rightmost label, only look in the cache (it is our local namestore), for the others...
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
char * label
label/name corresponding to the authority
const char * GNUNET_h2s(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
int gns_authority
GNUNET_YES if the authority was a GNS authority, GNUNET_NO if the authority was a DNS authority...
struct AuthorityChain * ac_head
DLL to store the authority chain.
Handle to a currently pending resolution.
struct AuthorityChain * ac_tail
DLL to store the authority chain.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
struct GNUNET_NAMECACHE_QueueEntry * namecache_qe
Pending Namecache lookup task.
DLL to hold the authority chain we had to pass in the resolution process.
A 512-bit hashcode.
void GNUNET_GNSRECORD_query_from_public_key(const struct GNUNET_IDENTITY_PublicKey *pub, const char *label, struct GNUNET_HashCode *query)
Calculate the DHT query for a given label in a given zone.
static void handle_gns_namecache_resolution_result(void *cls, unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
Process a records that were decrypted from a block that we got from the namecache.
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
enum GNUNET_GenericReturnValue GNUNET_GNSRECORD_block_decrypt(const struct GNUNET_GNSRECORD_Block *block, const struct GNUNET_IDENTITY_PublicKey *zone_key, const char *label, GNUNET_GNSRECORD_RecordCallback proc, void *proc_cls)
Decrypt block.
static void fail_resolution(struct GNS_ResolverHandle *rh)
Function called to asynchronously fail a resolution.
An identity key as per LSD0001.
static void start_dht_request(struct GNS_ResolverHandle *rh, const struct GNUNET_HashCode *query)
Initiate a DHT query for a set of GNS records.
#define GNUNET_log(kind,...)
struct GNUNET_TIME_Relative GNUNET_TIME_absolute_get_remaining(struct GNUNET_TIME_Absolute future)
Given a timestamp in the future, how much time remains until then?
Definition: time.c:232
Defaults, look in cache, then in DHT.
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
struct GNUNET_TIME_Absolute GNUNET_GNSRECORD_block_get_expiration(const struct GNUNET_GNSRECORD_Block *block)
Returns the expiration of a block.
const char * GNUNET_GNSRECORD_z2s(const struct GNUNET_IDENTITY_PublicKey *z)
Convert a zone key to a string (for printing debug messages).
enum GNUNET_GNS_LocalOptions options
Use only cache.
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◆ recursive_gns_resolution_namecache()

static void recursive_gns_resolution_namecache ( struct GNS_ResolverHandle rh)
static

Lookup tail of our authority chain in the namecache.

Parameters
rhquery we are processing

Definition at line 2688 of file gnunet-service-gns_resolver.c.

References Gns2DnsPending::ac, GNS_ResolverHandle::ac_tail, AuthorityChain::authority_info, disable_cache, AuthorityChain::gns_authority, GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_GNSRECORD_query_from_public_key(), GNUNET_GNSRECORD_z2s(), GNUNET_log, GNUNET_NAMECACHE_lookup_block(), GNUNET_YES, handle_namecache_block_response(), AuthorityChain::label, GNS_ResolverHandle::namecache_qe, and start_dht_request().

Referenced by handle_revocation_result().

2689 {
2690  struct AuthorityChain *ac = rh->ac_tail;
2691  struct GNUNET_HashCode query;
2692 
2694  "Starting GNS resolution for `%s' in zone %s\n",
2695  ac->label,
2698  ac->label,
2699  &query);
2700  if (GNUNET_YES != disable_cache)
2701  {
2702  rh->namecache_qe
2704  &query,
2706  rh);
2707  GNUNET_assert (NULL != rh->namecache_qe);
2708  }
2709  else
2710  {
2711  start_dht_request (rh,
2712  &query);
2713  }
2714 }
static struct GNUNET_NAMECACHE_Handle * namecache_handle
Our handle to the namecache service.
static void handle_namecache_block_response(void *cls, const struct GNUNET_GNSRECORD_Block *block)
Process a record that was stored in the namecache.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
char * label
label/name corresponding to the authority
int gns_authority
GNUNET_YES if the authority was a GNS authority, GNUNET_NO if the authority was a DNS authority...
static int disable_cache
Use namecache.
struct AuthorityChain * ac_tail
DLL to store the authority chain.
struct GNUNET_NAMECACHE_QueueEntry * namecache_qe
Pending Namecache lookup task.
DLL to hold the authority chain we had to pass in the resolution process.
A 512-bit hashcode.
void GNUNET_GNSRECORD_query_from_public_key(const struct GNUNET_IDENTITY_PublicKey *pub, const char *label, struct GNUNET_HashCode *query)
Calculate the DHT query for a given label in a given zone.
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
struct GNUNET_NAMECACHE_QueueEntry * GNUNET_NAMECACHE_lookup_block(struct GNUNET_NAMECACHE_Handle *h, const struct GNUNET_HashCode *derived_hash, GNUNET_NAMECACHE_BlockProcessor proc, void *proc_cls)
Get a result for a particular key from the namecache.
static void start_dht_request(struct GNS_ResolverHandle *rh, const struct GNUNET_HashCode *query)
Initiate a DHT query for a set of GNS records.
#define GNUNET_log(kind,...)
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
const char * GNUNET_GNSRECORD_z2s(const struct GNUNET_IDENTITY_PublicKey *z)
Convert a zone key to a string (for printing debug messages).
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◆ handle_revocation_result()

static void handle_revocation_result ( void *  cls,
int  is_valid 
)
static

Function called with the result from a revocation check.

Parameters
clsthe struct GNS_ResovlerHandle
is_validGNUNET_YES if the zone was not yet revoked

Definition at line 2724 of file gnunet-service-gns_resolver.c.

References _, Gns2DnsPending::ac, GNS_ResolverHandle::ac_tail, AuthorityChain::authority_info, fail_resolution(), AuthorityChain::gns_authority, GNUNET_ERROR_TYPE_WARNING, GNUNET_GNSRECORD_z2s(), GNUNET_log, GNUNET_YES, recursive_gns_resolution_namecache(), GNS_ResolverHandle::rev_check, and Gns2DnsPending::rh.

Referenced by recursive_gns_resolution_revocation().

2726 {
2727  struct GNS_ResolverHandle *rh = cls;
2728  struct AuthorityChain *ac = rh->ac_tail;
2729 
2730  rh->rev_check = NULL;
2731  if (GNUNET_YES != is_valid)
2732  {
2734  _ ("Zone %s was revoked, resolution fails\n"),
2736  fail_resolution (rh);
2737  return;
2738  }
2740 }
int gns_authority
GNUNET_YES if the authority was a GNS authority, GNUNET_NO if the authority was a DNS authority...
Handle to a currently pending resolution.
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
struct AuthorityChain * ac_tail
DLL to store the authority chain.
static void recursive_gns_resolution_namecache(struct GNS_ResolverHandle *rh)
Lookup tail of our authority chain in the namecache.
DLL to hold the authority chain we had to pass in the resolution process.
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
static void fail_resolution(struct GNS_ResolverHandle *rh)
Function called to asynchronously fail a resolution.
#define GNUNET_log(kind,...)
struct GNUNET_REVOCATION_Query * rev_check
Pending revocation check.
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
const char * GNUNET_GNSRECORD_z2s(const struct GNUNET_IDENTITY_PublicKey *z)
Convert a zone key to a string (for printing debug messages).
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◆ recursive_gns_resolution_revocation()

static void recursive_gns_resolution_revocation ( struct GNS_ResolverHandle rh)
static

Perform revocation check on tail of our authority chain.

Parameters
rhquery we are processing

Definition at line 2749 of file gnunet-service-gns_resolver.c.

References Gns2DnsPending::ac, GNS_ResolverHandle::ac_tail, AuthorityChain::authority_info, AuthorityChain::gns_authority, GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_GNSRECORD_z2s(), GNUNET_log, GNUNET_REVOCATION_query(), handle_revocation_result(), and GNS_ResolverHandle::rev_check.

Referenced by recursive_resolution().

2750 {
2751  struct AuthorityChain *ac = rh->ac_tail;
2752 
2754  "Starting revocation check for zone %s\n",
2759  rh);
2760  GNUNET_assert (NULL != rh->rev_check);
2761 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
int gns_authority
GNUNET_YES if the authority was a GNS authority, GNUNET_NO if the authority was a DNS authority...
static const struct GNUNET_CONFIGURATION_Handle * cfg
Global configuration.
struct GNUNET_REVOCATION_Query * GNUNET_REVOCATION_query(const struct GNUNET_CONFIGURATION_Handle *cfg, const struct GNUNET_IDENTITY_PublicKey *key, GNUNET_REVOCATION_Callback func, void *func_cls)
Check if a key was revoked.
struct AuthorityChain * ac_tail
DLL to store the authority chain.
DLL to hold the authority chain we had to pass in the resolution process.
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
static void handle_revocation_result(void *cls, int is_valid)
Function called with the result from a revocation check.
#define GNUNET_log(kind,...)
struct GNUNET_REVOCATION_Query * rev_check
Pending revocation check.
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
const char * GNUNET_GNSRECORD_z2s(const struct GNUNET_IDENTITY_PublicKey *z)
Convert a zone key to a string (for printing debug messages).
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◆ GNS_resolver_lookup()

struct GNS_ResolverHandle* GNS_resolver_lookup ( const struct GNUNET_IDENTITY_PublicKey zone,
uint32_t  record_type,
const char *  name,
enum GNUNET_GNS_LocalOptions  options,
uint16_t  recursion_depth_limit,
GNS_ResultProcessor  proc,
void *  proc_cls 
)

Lookup of a record in a specific zone calls lookup result processor on result.

Lookup of a record in a specific zone calls RecordLookupProcessor on result or timeout.

Parameters
zonethe zone to perform the lookup in
record_typethe record type to look up
namethe name to look up
optionslocal options to control local lookup
recursion_depth_limithow many zones to traverse at most
procthe processor to call on result
proc_clsthe closure to pass to proc
Returns
handle to cancel operation

Definition at line 2878 of file gnunet-service-gns_resolver.c.

References GNS_ResolverHandle::authority_zone, GNUNET_CONTAINER_DLL_insert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_new, GNUNET_SCHEDULER_add_now(), GNUNET_strdup, GNS_ResolverHandle::loop_threshold, GNS_ResolverHandle::name, GNS_ResolverHandle::name_resolution_pos, options, GNS_ResolverHandle::options, GNS_ResolverHandle::proc, GNS_ResolverHandle::proc_cls, GNS_ResolverHandle::record_type, Gns2DnsPending::rh, start_resolver_lookup(), GNS_ResolverHandle::task_id, and zone.

Referenced by handle_dns_request(), and handle_lookup().

2885 {
2886  struct GNS_ResolverHandle *rh;
2887 
2889  "Starting lookup for `%s'\n",
2890  name);
2891  rh = GNUNET_new (struct GNS_ResolverHandle);
2893  rlh_tail,
2894  rh);
2895  rh->authority_zone = *zone;
2896  rh->proc = proc;
2897  rh->proc_cls = proc_cls;
2898  rh->options = options;
2899  rh->record_type = record_type;
2900  rh->name = GNUNET_strdup (name);
2901  rh->name_resolution_pos = strlen (name);
2902  rh->loop_threshold = recursion_depth_limit;
2904  rh);
2905  return rh;
2906 }
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
struct GNUNET_GETOPT_CommandLineOption options[]
Definition: 002.c:5
unsigned int loop_threshold
Maximum value of loop_limiter allowed by client.
GNS_ResultProcessor proc
called when resolution phase finishes
#define GNUNET_new(type)
Allocate a struct or union of the given type.
char * name
The name to resolve.
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
Handle to a currently pending resolution.
void * proc_cls
closure passed to proc
static void start_resolver_lookup(void *cls)
Begin the resolution process from &#39;name&#39;, starting with the identification of the zone specified by &#39;...
static char * zone
Name of the zone we manage.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1296
int record_type
Desired type for the resolution.
struct GNUNET_SCHEDULER_Task * task_id
ID of a task associated with the resolution process.
size_t name_resolution_pos
Current offset in name where we are resolving.
struct GNUNET_IDENTITY_PublicKey authority_zone
The top-level GNS authoritative zone to query.
const char * name
#define GNUNET_log(kind,...)
static struct GNS_ResolverHandle * rlh_head
Head of resolver lookup list.
static struct GNS_ResolverHandle * rlh_tail
Tail of resolver lookup list.
enum GNUNET_GNS_LocalOptions options
Use only cache.
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◆ GNS_resolver_lookup_cancel()

void GNS_resolver_lookup_cancel ( struct GNS_ResolverHandle rh)

Cancel active resolution (i.e.

client disconnected).

Parameters
rhresolution to abort

Definition at line 2915 of file gnunet-service-gns_resolver.c.

References Gns2DnsPending::ac, GNS_ResolverHandle::ac_head, GNS_ResolverHandle::ac_tail, AuthorityChain::authority_info, GNS_ResolverHandle::dht_heap_node, AuthorityChain::dns_authority, GNS_ResolverHandle::dns_request, GNS_ResolverHandle::dns_result_head, GNS_ResolverHandle::dns_result_tail, Gns2DnsPending::dns_rh, GNS_ResolverHandle::get_handle, AuthorityChain::gns_authority, GNS_resolver_lookup_cancel_(), GNUNET_assert, GNUNET_CONTAINER_DLL_insert, GNUNET_CONTAINER_DLL_remove, GNUNET_CONTAINER_heap_remove_node(), GNUNET_DHT_get_stop(), GNUNET_DNSSTUB_resolve_cancel(), GNUNET_DNSSTUB_stop(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_NAMECACHE_cancel(), GNUNET_NO, GNUNET_RESOLVER_request_cancel(), GNUNET_REVOCATION_query_cancel(), GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), GNUNET_VPN_cancel_request(), AuthorityChain::label, GNS_ResolverHandle::leho, GNS_ResolverHandle::name, GNS_ResolverHandle::namecache_qe, VpnContext::rd_data, GNS_ResolverHandle::rev_check, Gns2DnsPending::rh, GNS_ResolverHandle::std_resolve, GNS_ResolverHandle::task_id, GNS_ResolverHandle::vpn_ctx, and VpnContext::vpn_request.

Referenced by client_disconnect_cb(), GNS_interceptor_done(), GNS_resolver_done(), GNS_resolver_lookup_cancel_(), and transmit_lookup_dns_result().

2916 {
2917  struct DnsResult *dr;
2918  struct AuthorityChain *ac;
2919  struct VpnContext *vpn_ctx;
2920 
2922  rlh_tail,
2923  rh);
2924  if (NULL != rh->dns_request)
2925  {
2927  rh->dns_request = NULL;
2928  }
2929  while (NULL != (ac = rh->ac_head))
2930  {
2932  rh->ac_tail,
2933  ac);
2934  if (GNUNET_NO == ac->gns_authority)
2935  {
2936  struct Gns2DnsPending *gp;
2937 
2938  while (NULL != (gp = ac->authority_info.dns_authority.gp_head))
2939  {
2941  ac->authority_info.dns_authority.gp_tail,
2942  gp);
2943  if (NULL != gp->rh)
2944  {
2945  /* rh->g2dc->rh is NOT in the DLL yet, so to enable us
2946  using GNS_resolver_lookup_cancel here, we need to
2947  add it first... */
2949  rlh_tail,
2950  gp->rh);
2951  GNUNET_assert (NULL == gp->rh->task_id);
2954  gp->rh);
2955  gp->rh = NULL;
2956  }
2957  if (NULL != gp->dns_rh)
2958  {
2960  gp->dns_rh = NULL;
2961  }
2962  GNUNET_free (gp);
2963  }
2965  }
2966  GNUNET_free (ac->label);
2967  GNUNET_free (ac);
2968  }
2969  if (NULL != rh->task_id)
2970  {
2972  rh->task_id = NULL;
2973  }
2974  if (NULL != rh->get_handle)
2975  {
2977  rh->get_handle = NULL;
2978  }
2979  if (NULL != rh->dht_heap_node)
2980  {
2982  rh->dht_heap_node = NULL;
2983  }
2984  if (NULL != (vpn_ctx = rh->vpn_ctx))
2985  {
2987  GNUNET_free (vpn_ctx->rd_data);
2988  GNUNET_free (vpn_ctx);
2989  }
2990  if (NULL != rh->namecache_qe)
2991  {
2993  rh->namecache_qe = NULL;
2994  }
2995  if (NULL != rh->rev_check)
2996  {
2998  rh->rev_check = NULL;
2999  }
3000  if (NULL != rh->std_resolve)
3001  {
3003  "Canceling standard DNS resolution\n");
3005  rh->std_resolve = NULL;
3006  }
3007  while (NULL != (dr = rh->dns_result_head))
3008  {
3010  rh->dns_result_tail,
3011  dr);
3012  GNUNET_free (dr);
3013  }
3014  GNUNET_free (rh->leho);
3015  GNUNET_free (rh->name);
3016  GNUNET_free (rh);
3017 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
struct GNS_ResolverHandle * rh
Handle for the resolution of the IP part of the GNS2DNS record.
void GNUNET_REVOCATION_query_cancel(struct GNUNET_REVOCATION_Query *q)
Cancel key revocation check.
void GNUNET_RESOLVER_request_cancel(struct GNUNET_RESOLVER_RequestHandle *rh)
Cancel a request that is still pending with the resolver.
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
struct GNUNET_DHT_GetHandle * get_handle
Handle for DHT lookups.
static void GNS_resolver_lookup_cancel_(void *cls)
Wrapper around GNS_resolver_lookup_cancel() as a task.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
void GNUNET_DNSSTUB_stop(struct GNUNET_DNSSTUB_Context *ctx)
Cleanup DNSSTUB resolver.
Definition: dnsstub.c:690
char * label
label/name corresponding to the authority
struct GNUNET_VPN_RedirectionRequest * vpn_request
Handle to the VPN request that we were performing.
char * name
The name to resolve.
int gns_authority
GNUNET_YES if the authority was a GNS authority, GNUNET_NO if the authority was a DNS authority...
struct AuthorityChain * ac_head
DLL to store the authority chain.
struct GNUNET_RESOLVER_RequestHandle * std_resolve
Handle for standard DNS resolution, NULL if none is active.
struct AuthorityChain * ac_tail
DLL to store the authority chain.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1296
struct GNUNET_NAMECACHE_QueueEntry * namecache_qe
Pending Namecache lookup task.
void GNUNET_NAMECACHE_cancel(struct GNUNET_NAMECACHE_QueueEntry *qe)
Cancel a namecache operation.
DLL to hold the authority chain we had to pass in the resolution process.
struct GNUNET_SCHEDULER_Task * task_id
ID of a task associated with the resolution process.
void GNUNET_DHT_get_stop(struct GNUNET_DHT_GetHandle *get_handle)
Stop async DHT-get.
Definition: dht_api.c:1155
void GNUNET_VPN_cancel_request(struct GNUNET_VPN_RedirectionRequest *rr)
Cancel redirection request with the service.
Definition: vpn_api.c:375
A result we got from DNS.
struct GNUNET_CONTAINER_HeapNode * dht_heap_node
Heap node associated with this lookup.
Element of a resolution process for looking up the responsible DNS server hostname in a GNS2DNS recur...
struct VpnContext * vpn_ctx
Handle to a VPN request, NULL if none is active.
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
char * rd_data
Serialized records.
struct GNUNET_DNSSTUB_RequestSocket * dns_request
Socket for a DNS request, NULL if none is active.
struct GNUNET_RESOLVER_RequestHandle * dns_rh
Handle for DNS resolution of the DNS nameserver.
Closure for vpn_allocation_cb.
void GNUNET_DNSSTUB_resolve_cancel(struct GNUNET_DNSSTUB_RequestSocket *rs)
Cancel DNS resolution.
Definition: dnsstub.c:540
#define GNUNET_log(kind,...)
static struct GNS_ResolverHandle * rlh_head
Head of resolver lookup list.
static struct GNS_ResolverHandle * rlh_tail
Tail of resolver lookup list.
struct GNUNET_REVOCATION_Query * rev_check
Pending revocation check.
struct DnsResult * dns_result_tail
DLL of results we got from DNS.
union AuthorityChain::@19 authority_info
Information about the resolver authority for this label.
char * leho
Legacy Hostname to use if we encountered GNS2DNS record and thus can deduct the LEHO from that transi...
void * GNUNET_CONTAINER_heap_remove_node(struct GNUNET_CONTAINER_HeapNode *node)
Removes a node from the heap.
struct AuthorityChain::@19::@20 dns_authority
struct DnsResult * dns_result_head
DLL of results we got from DNS.
#define GNUNET_free(ptr)
Wrapper around free.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:972
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◆ GNS_resolver_init()

void GNS_resolver_init ( struct GNUNET_NAMECACHE_Handle nc,
struct GNUNET_DHT_Handle dht,
const struct GNUNET_CONFIGURATION_Handle c,
unsigned long long  max_bg_queries 
)

Initialize the resolver.

Initialize the resolver subsystem.

Parameters
ncthe namecache handle
dhtthe dht handle
cconfiguration handle
max_bg_queriesmaximum number of parallel background queries in dht

Definition at line 3032 of file gnunet-service-gns_resolver.c.

References dht, disable_cache, GNUNET_CONFIGURATION_get_value_yesno(), GNUNET_CONTAINER_heap_create(), GNUNET_CONTAINER_HEAP_ORDER_MIN, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_VPN_connect(), GNUNET_YES, max_allowed_background_queries, and nc.

Referenced by run().

3036 {
3037  cfg = c;
3038  namecache_handle = nc;
3039  dht_handle = dht;
3040  dht_lookup_heap =
3042  max_allowed_background_queries = max_bg_queries;
3044  "namecache",
3045  "DISABLE");
3046  if (GNUNET_YES == disable_cache)
3048  "Namecache disabled\n");
3050 }
static struct GNUNET_VPN_Handle * vpn_handle
Our handle to the vpn service.
static struct GNUNET_NAMECACHE_Handle * namecache_handle
Our handle to the namecache service.
static struct GNUNET_CONTAINER_Heap * dht_lookup_heap
Heap for limiting parallel DHT lookups.
static unsigned long long max_allowed_background_queries
Maximum amount of parallel queries to the DHT.
static const struct GNUNET_CONFIGURATION_Handle * cfg
Global configuration.
static int disable_cache
Use namecache.
static struct GNUNET_DHT_Handle * dht_handle
Resolver handle to the dht.
Heap with the minimum cost at the root.
static struct GNUNET_PEERINFO_NotifyContext * nc
Iterator context.
struct GNUNET_CONTAINER_Heap * GNUNET_CONTAINER_heap_create(enum GNUNET_CONTAINER_HeapOrder order)
Create a new heap.
struct GNUNET_VPN_Handle * GNUNET_VPN_connect(const struct GNUNET_CONFIGURATION_Handle *cfg)
Connect to the VPN service.
Definition: vpn_api.c:512
#define GNUNET_log(kind,...)
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_get_value_yesno(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option)
Get a configuration value that should be in a set of "YES" or "NO".
static struct GNUNET_DHT_Handle * dht
Handle to the DHT.
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◆ GNS_resolver_done()

void GNS_resolver_done ( void  )

Shutdown resolver.

Cleanup resolver: Terminate pending lookups.

Definition at line 3057 of file gnunet-service-gns_resolver.c.

References GNS_resolver_lookup_cancel(), GNUNET_CONTAINER_DLL_remove, GNUNET_CONTAINER_heap_destroy(), GNUNET_free, GNUNET_NAMECACHE_cancel(), GNUNET_VPN_disconnect(), CacheOps::namecache_qe_cache, GNS_ResolverHandle::proc, GNS_ResolverHandle::proc_cls, and Gns2DnsPending::rh.

Referenced by shutdown_task().

3058 {
3059  struct GNS_ResolverHandle *rh;
3060  struct CacheOps *co;
3061 
3062  /* abort active resolutions */
3063  while (NULL != (rh = rlh_head))
3064  {
3065  rh->proc (rh->proc_cls,
3066  0,
3067  NULL);
3069  }
3070  while (NULL != (co = co_head))
3071  {
3073  co_tail,
3074  co);
3076  GNUNET_free (co);
3077  }
3079  dht_lookup_heap = NULL;
3081  vpn_handle = NULL;
3082  dht_handle = NULL;
3083  namecache_handle = NULL;
3084 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
static struct GNUNET_VPN_Handle * vpn_handle
Our handle to the vpn service.
static struct GNUNET_NAMECACHE_Handle * namecache_handle
Our handle to the namecache service.
static struct GNUNET_CONTAINER_Heap * dht_lookup_heap
Heap for limiting parallel DHT lookups.
void GNS_resolver_lookup_cancel(struct GNS_ResolverHandle *rh)
Cancel active resolution (i.e.
struct GNUNET_NAMECACHE_QueueEntry * namecache_qe_cache
Pending Namestore caching task.
GNS_ResultProcessor proc
called when resolution phase finishes
Handle to a currently pending resolution.
void * proc_cls
closure passed to proc
Active namestore caching operations.
void GNUNET_VPN_disconnect(struct GNUNET_VPN_Handle *vh)
Disconnect from the VPN service.
Definition: vpn_api.c:534
static struct GNUNET_DHT_Handle * dht_handle
Resolver handle to the dht.
void GNUNET_NAMECACHE_cancel(struct GNUNET_NAMECACHE_QueueEntry *qe)
Cancel a namecache operation.
void GNUNET_CONTAINER_heap_destroy(struct GNUNET_CONTAINER_Heap *heap)
Destroys the heap.
static struct GNS_ResolverHandle * rlh_head
Head of resolver lookup list.
static struct CacheOps * co_tail
Organized in a DLL.
#define GNUNET_free(ptr)
Wrapper around free.
static struct CacheOps * co_head
Organized in a DLL.
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Variable Documentation

◆ namecache_handle

struct GNUNET_NAMECACHE_Handle* namecache_handle
static

Our handle to the namecache service.

Definition at line 463 of file gnunet-service-gns_resolver.c.

◆ vpn_handle

struct GNUNET_VPN_Handle* vpn_handle
static

Our handle to the vpn service.

Definition at line 468 of file gnunet-service-gns_resolver.c.

◆ dht_handle

struct GNUNET_DHT_Handle* dht_handle
static

Resolver handle to the dht.

Definition at line 473 of file gnunet-service-gns_resolver.c.

◆ dht_lookup_heap

struct GNUNET_CONTAINER_Heap* dht_lookup_heap
static

Heap for limiting parallel DHT lookups.

Definition at line 478 of file gnunet-service-gns_resolver.c.

◆ max_allowed_background_queries

unsigned long long max_allowed_background_queries
static

Maximum amount of parallel queries to the DHT.

Definition at line 483 of file gnunet-service-gns_resolver.c.

Referenced by GNS_resolver_init(), and start_dht_request().

◆ rlh_head

struct GNS_ResolverHandle* rlh_head
static

Head of resolver lookup list.

Definition at line 488 of file gnunet-service-gns_resolver.c.