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

GNUnet GNS service. More...

#include "gns.h"
#include "gnunet_dht_service.h"
#include "gnunet_gns_service.h"
#include "gnunet_namecache_service.h"
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Typedefs

typedef void(* GNS_ResultProcessor) (void *cls, uint32_t rd_count, const struct GNUNET_GNSRECORD_Data *rd)
 Function called with results for a GNS resolution. More...
 

Functions

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 subsystem. More...
 
void GNS_resolver_done (void)
 Cleanup resolver: Terminate pending lookups. More...
 
struct GNS_ResolverHandleGNS_resolver_lookup (const struct GNUNET_CRYPTO_EcdsaPublicKey *zone, uint32_t record_type, const char *name, enum GNUNET_GNS_LocalOptions options, GNS_ResultProcessor proc, void *proc_cls)
 Lookup of a record in a specific zone calls RecordLookupProcessor on result or timeout. More...
 
void GNS_resolver_lookup_cancel (struct GNS_ResolverHandle *rh)
 Cancel active resolution (i.e. More...
 

Detailed Description

GNUnet GNS service.

Author
Martin Schanzenbach

Definition in file gnunet-service-gns_resolver.h.

Typedef Documentation

◆ GNS_ResultProcessor

typedef void(* GNS_ResultProcessor) (void *cls, uint32_t rd_count, const struct GNUNET_GNSRECORD_Data *rd)

Function called with results for a GNS resolution.

Parameters
clsclosure
rd_countnumber of records in rd
rdrecords returned for the lookup

Definition at line 69 of file gnunet-service-gns_resolver.h.

Function Documentation

◆ 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 subsystem.

MUST be called before GNS_resolver_lookup.

Parameters
ncthe namecache handle
dhthandle to the dht
cconfiguration handle
max_bg_queriesmaximum amount of background queries

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 2919 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().

2923 {
2924  cfg = c;
2925  namecache_handle = nc;
2926  dht_handle = dht;
2927  dht_lookup_heap =
2929  max_allowed_background_queries = max_bg_queries;
2931  "namecache",
2932  "DISABLE");
2933  if (GNUNET_YES == disable_cache)
2935  "Namecache disabled\n");
2937 }
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,...)
#define GNUNET_YES
Definition: gnunet_common.h:77
int 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  )

Cleanup resolver: Terminate pending lookups.

Cleanup resolver: Terminate pending lookups.

Definition at line 2944 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().

2945 {
2946  struct GNS_ResolverHandle *rh;
2947  struct CacheOps *co;
2948 
2949  /* abort active resolutions */
2950  while (NULL != (rh = rlh_head))
2951  {
2952  rh->proc (rh->proc_cls,
2953  0,
2954  NULL);
2956  }
2957  while (NULL != (co = co_head))
2958  {
2960  co_tail,
2961  co);
2963  GNUNET_free (co);
2964  }
2966  dht_lookup_heap = NULL;
2968  vpn_handle = NULL;
2969  dht_handle = NULL;
2970  namecache_handle = NULL;
2971 }
#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 currenty 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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◆ GNS_resolver_lookup()

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

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
optionsoptions set to control local lookup
procthe processor to call
proc_clsthe closure to pass to proc
Returns
handle to cancel operation

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
procthe processor to call on result
proc_clsthe closure to pass to proc
Returns
handle to cancel operation

Definition at line 2767 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::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().

2773 {
2774  struct GNS_ResolverHandle *rh;
2775 
2777  "Starting lookup for `%s'\n",
2778  name);
2779  rh = GNUNET_new (struct GNS_ResolverHandle);
2781  rlh_tail,
2782  rh);
2783  rh->authority_zone = *zone;
2784  rh->proc = proc;
2785  rh->proc_cls = proc_cls;
2786  rh->options = options;
2787  rh->record_type = record_type;
2788  rh->name = GNUNET_strdup (name);
2789  rh->name_resolution_pos = strlen (name);
2791  rh);
2792  return rh;
2793 }
#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
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 currenty pending resolution.
void * proc_cls
closure passed to proc
static void start_resolver_lookup(void *cls)
Begin the resolution process from 'name', starting with the identification of the zone specified by '...
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:1280
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_CRYPTO_EcdsaPublicKey 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 2802 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_free_non_null, 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().

2803 {
2804  struct DnsResult *dr;
2805  struct AuthorityChain *ac;
2806  struct VpnContext *vpn_ctx;
2807 
2809  rlh_tail,
2810  rh);
2811  if (NULL != rh->dns_request)
2812  {
2814  rh->dns_request = NULL;
2815  }
2816  while (NULL != (ac = rh->ac_head))
2817  {
2819  rh->ac_tail,
2820  ac);
2821  if (GNUNET_NO == ac->gns_authority)
2822  {
2823  struct Gns2DnsPending *gp;
2824 
2825  while (NULL != (gp = ac->authority_info.dns_authority.gp_head))
2826  {
2828  ac->authority_info.dns_authority.gp_tail,
2829  gp);
2830  if (NULL != gp->rh)
2831  {
2832  /* rh->g2dc->rh is NOT in the DLL yet, so to enable us
2833  using GNS_resolver_lookup_cancel here, we need to
2834  add it first... */
2836  rlh_tail,
2837  gp->rh);
2838  GNUNET_assert (NULL == gp->rh->task_id);
2841  gp->rh);
2842  gp->rh = NULL;
2843  }
2844  if (NULL != gp->dns_rh)
2845  {
2847  gp->dns_rh = NULL;
2848  }
2849  GNUNET_free (gp);
2850  }
2852  }
2853  GNUNET_free (ac->label);
2854  GNUNET_free (ac);
2855  }
2856  if (NULL != rh->task_id)
2857  {
2859  rh->task_id = NULL;
2860  }
2861  if (NULL != rh->get_handle)
2862  {
2864  rh->get_handle = NULL;
2865  }
2866  if (NULL != rh->dht_heap_node)
2867  {
2869  rh->dht_heap_node = NULL;
2870  }
2871  if (NULL != (vpn_ctx = rh->vpn_ctx))
2872  {
2874  GNUNET_free (vpn_ctx->rd_data);
2875  GNUNET_free (vpn_ctx);
2876  }
2877  if (NULL != rh->namecache_qe)
2878  {
2880  rh->namecache_qe = NULL;
2881  }
2882  if (NULL != rh->rev_check)
2883  {
2885  rh->rev_check = NULL;
2886  }
2887  if (NULL != rh->std_resolve)
2888  {
2890  "Canceling standard DNS resolution\n");
2892  rh->std_resolve = NULL;
2893  }
2894  while (NULL != (dr = rh->dns_result_head))
2895  {
2897  rh->dns_result_tail,
2898  dr);
2899  GNUNET_free (dr);
2900  }
2901  GNUNET_free_non_null (rh->leho);
2902  GNUNET_free (rh->name);
2903  GNUNET_free (rh);
2904 }
#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.
#define GNUNET_NO
Definition: gnunet_common.h:78
#define GNUNET_free_non_null(ptr)
Free the memory pointed to by ptr if ptr is not NULL.
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:1280
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:966
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