GNUnet 0.21.1
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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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...


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_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 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.

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.

rd_countnumber of records in rd
rdrecords returned for the lookup

Definition at line 68 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.

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

Initialize the resolver subsystem.

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

Definition at line 3121 of file gnunet-service-gns_resolver.c.

3126 cfg = c;
3128 dht_handle = dht;
3131 max_allowed_background_queries = max_bg_queries;
3133 "namecache",
3134 "DISABLE");
3137 "Namecache disabled\n");
static struct GNUNET_DHT_Handle * dht
Handle to the DHT.
static struct GNUNET_NotificationContext * nc
Notification context for broadcasting to monitors.
static int disable_cache
Use namecache.
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 struct GNUNET_DHT_Handle * dht_handle
Resolver handle to the dht.
static struct GNUNET_CONTAINER_Heap * dht_lookup_heap
Heap for limiting parallel DHT lookups.
static struct GNUNET_NAMECACHE_Handle * namecache_handle
Our handle to the namecache service.
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".
struct GNUNET_CONTAINER_Heap * GNUNET_CONTAINER_heap_create(enum GNUNET_CONTAINER_HeapOrder order)
Create a new heap.
Heap with the minimum cost at the root.
#define GNUNET_log(kind,...)

References cfg, dht, dht_handle, dht_lookup_heap, disable_cache, GNUNET_CONFIGURATION_get_value_yesno(), GNUNET_CONTAINER_heap_create(), GNUNET_CONTAINER_HEAP_ORDER_MIN, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_YES, max_allowed_background_queries, namecache_handle, and nc.

Referenced by run().

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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 3145 of file gnunet-service-gns_resolver.c.

3147 struct GNS_ResolverHandle *rh;
3148 struct CacheOps *co;
3150 /* abort active resolutions */
3151 while (NULL != (rh = rlh_head))
3152 {
3153 rh->proc (rh->proc_cls,
3154 0,
3155 NULL);
3157 }
3158 while (NULL != (co = co_head))
3159 {
3161 co_tail,
3162 co);
3164 GNUNET_free (co);
3165 }
3167 dht_lookup_heap = NULL;
3168 dht_handle = NULL;
3169 namecache_handle = NULL;
static struct GNS_ResolverHandle * rlh_head
Head of resolver lookup list.
void GNS_resolver_lookup_cancel(struct GNS_ResolverHandle *rh)
Cancel active resolution (i.e.
static struct CacheOps * co_head
Organized in a DLL.
static struct CacheOps * co_tail
Organized in a DLL.
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
void GNUNET_CONTAINER_heap_destroy(struct GNUNET_CONTAINER_Heap *heap)
Destroys the heap.
#define GNUNET_free(ptr)
Wrapper around free.
void GNUNET_NAMECACHE_cancel(struct GNUNET_NAMECACHE_QueueEntry *qe)
Cancel a namecache operation.
Active namestore caching operations.
struct GNUNET_NAMECACHE_QueueEntry * namecache_qe_cache
Pending Namestore caching task.
Handle to a currently pending resolution.
void * proc_cls
closure passed to proc
GNS_ResultProcessor proc
called when resolution phase finishes

References co_head, co_tail, dht_handle, dht_lookup_heap, GNS_resolver_lookup_cancel(), GNUNET_CONTAINER_DLL_remove, GNUNET_CONTAINER_heap_destroy(), GNUNET_free, GNUNET_NAMECACHE_cancel(), namecache_handle, CacheOps::namecache_qe_cache, GNS_ResolverHandle::proc, GNS_ResolverHandle::proc_cls, and rlh_head.

Referenced by shutdown_task().

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◆ GNS_resolver_lookup()

struct GNS_ResolverHandle * GNS_resolver_lookup ( const struct GNUNET_CRYPTO_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 RecordLookupProcessor on result or timeout.

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
recursion_depth_limithow many zones to traverse at most
procthe processor to call
proc_clsthe closure to pass to proc
handle to cancel operation

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

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
handle to cancel operation

Definition at line 2969 of file gnunet-service-gns_resolver.c.

2977 struct GNS_ResolverHandle *rh;
2980 "Starting lookup for `%s'\n",
2981 name);
2982 rh = GNUNET_new (struct GNS_ResolverHandle);
2984 rlh_tail,
2985 rh);
2986 rh->authority_zone = *zone;
2987 rh->proc = proc;
2988 rh->proc_cls = proc_cls;
2989 rh->options = options;
2991 rh->name = GNUNET_strdup (name);
2992 rh->name_resolution_pos = strlen (name);
2993 rh->loop_threshold = recursion_depth_limit;
2995 rh);
2996 return rh;
struct GNUNET_GETOPT_CommandLineOption options[]
Definition: 002.c:5
static char * name
Name (label) of the records to list.
static void start_resolver_lookup(void *cls)
Begin the resolution process from 'name', starting with the identification of the zone specified by '...
static struct GNS_ResolverHandle * rlh_tail
Tail of resolver lookup list.
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
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:1305
size_t name_resolution_pos
Current offset in name where we are resolving.
struct GNUNET_CRYPTO_PublicKey authority_zone
The top-level GNS authoritative zone to query.
int record_type
Desired type for the resolution.
unsigned int loop_threshold
Maximum value of loop_limiter allowed by client.
struct GNUNET_SCHEDULER_Task * task_id
ID of a task associated with the resolution process.
char * name
The name to resolve.
enum GNUNET_GNS_LocalOptions options
Use only cache.

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, name, GNS_ResolverHandle::name, GNS_ResolverHandle::name_resolution_pos, options, GNS_ResolverHandle::options, GNS_ResolverHandle::proc, GNS_ResolverHandle::proc_cls, GNS_ResolverHandle::record_type, rlh_head, rlh_tail, start_resolver_lookup(), and GNS_ResolverHandle::task_id.

Referenced by handle_dns_request(), and handle_lookup().

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◆ GNS_resolver_lookup_cancel()

void GNS_resolver_lookup_cancel ( struct GNS_ResolverHandle rh)

Cancel active resolution (i.e.

client disconnected).

rhresolution to abort

Definition at line 3006 of file gnunet-service-gns_resolver.c.

3008 struct DnsResult *dr;
3009 struct AuthorityChain *ac;
3012 rlh_tail,
3013 rh);
3014 if (NULL != rh->dns_request)
3015 {
3017 rh->dns_request = NULL;
3018 }
3019 while (NULL != (ac = rh->ac_head))
3020 {
3022 rh->ac_tail,
3023 ac);
3024 if (GNUNET_NO == ac->gns_authority)
3025 {
3026 struct Gns2DnsPending *gp;
3028 while (NULL != (gp = ac->authority_info.dns_authority.gp_head))
3029 {
3032 gp);
3033 if (NULL != gp->rh)
3034 {
3035 /* rh->g2dc->rh is NOT in the DLL yet, so to enable us
3036 using GNS_resolver_lookup_cancel here, we need to
3037 add it first... */
3039 rlh_tail,
3040 gp->rh);
3041 GNUNET_assert (NULL == gp->rh->task_id);
3044 gp->rh);
3045 gp->rh = NULL;
3046 }
3047 if (NULL != gp->dns_rh)
3048 {
3050 gp->dns_rh = NULL;
3051 }
3052 GNUNET_free (gp);
3053 }
3055 }
3056 GNUNET_free (ac->label);
3057 GNUNET_free (ac);
3058 }
3059 if (NULL != rh->task_id)
3060 {
3062 rh->task_id = NULL;
3063 }
3064 if (NULL != rh->get_handle)
3065 {
3067 rh->get_handle = NULL;
3068 }
3069 if (NULL != rh->dht_heap_node)
3070 {
3072 rh->dht_heap_node = NULL;
3073 }
3074 if (NULL != rh->namecache_qe)
3075 {
3077 rh->namecache_qe = NULL;
3078 }
3079 if (NULL != rh->rev_check)
3080 {
3082 rh->rev_check = NULL;
3083 }
3084 if (NULL != rh->std_resolve)
3085 {
3087 "Canceling standard DNS resolution\n");
3089 rh->std_resolve = NULL;
3090 }
3091 while (NULL != (dr = rh->dns_result_head))
3092 {
3095 dr);
3096 GNUNET_free (dr);
3097 }
3098 if (NULL != rh->prefix)
3099 {
3101 rh->prefix = NULL;
3102 }
3103 GNUNET_free (rh->leho);
3104 GNUNET_free (rh->name);
3105 GNUNET_free (rh);
static void GNS_resolver_lookup_cancel_(void *cls)
Wrapper around GNS_resolver_lookup_cancel() as a task.
void GNUNET_DHT_get_stop(struct GNUNET_DHT_GetHandle *get_handle)
Stop async DHT-get.
Definition: dht_api.c:1235
void GNUNET_DNSSTUB_stop(struct GNUNET_DNSSTUB_Context *ctx)
Cleanup DNSSTUB resolver.
Definition: dnsstub.c:705
void GNUNET_DNSSTUB_resolve_cancel(struct GNUNET_DNSSTUB_RequestSocket *rs)
Cancel DNS resolution.
Definition: dnsstub.c:562
void * GNUNET_CONTAINER_heap_remove_node(struct GNUNET_CONTAINER_HeapNode *node)
Removes a node from the heap.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
void GNUNET_RESOLVER_request_cancel(struct GNUNET_RESOLVER_RequestHandle *rh)
Cancel a request that is still pending with the resolver.
void GNUNET_REVOCATION_query_cancel(struct GNUNET_REVOCATION_Query *q)
Cancel key revocation check.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:981
DLL to hold the authority chain we had to pass in the resolution process.
char * label
label/name corresponding to the authority
union AuthorityChain::@55 authority_info
Information about the resolver authority for this label.
int gns_authority
GNUNET_YES if the authority was a GNS authority, GNUNET_NO if the authority was a DNS authority.
struct GNUNET_DNSSTUB_Context * dns_handle
Handle to perform DNS lookups with this authority (in GNS2DNS handling).
struct GNS_ResolverHandle * rh
Resolver handle this entry in the chain belongs to.
struct Gns2DnsPending * gp_head
List of resolutions of the 'ip' of the name server that are still pending.
struct Gns2DnsPending * gp_tail
Tail of list of resolutions of the 'ip' of the name server that are still pending.
struct AuthorityChain::@55::@56 dns_authority
A result we got from DNS.
char * leho
Legacy Hostname to use if we encountered GNS2DNS record and thus can deduct the LEHO from that transi...
struct GNUNET_CONTAINER_HeapNode * dht_heap_node
Heap node associated with this lookup.
struct GNUNET_DHT_GetHandle * get_handle
Handle for DHT lookups.
struct DnsResult * dns_result_tail
DLL of results we got from DNS.
struct GNUNET_REVOCATION_Query * rev_check
Pending revocation check.
struct GNUNET_NAMECACHE_QueueEntry * namecache_qe
Pending Namecache lookup task.
struct GNUNET_RESOLVER_RequestHandle * std_resolve
Handle for standard DNS resolution, NULL if none is active.
struct DnsResult * dns_result_head
DLL of results we got from DNS.
struct AuthorityChain * ac_head
DLL to store the authority chain.
struct AuthorityChain * ac_tail
DLL to store the authority chain.
char * prefix
struct GNUNET_DNSSTUB_RequestSocket * dns_request
Socket for a DNS request, NULL if none is active.
Element of a resolution process for looking up the responsible DNS server hostname in a GNS2DNS recur...
struct GNUNET_RESOLVER_RequestHandle * dns_rh
Handle for DNS resolution of the DNS nameserver.
struct GNS_ResolverHandle * rh
Handle for the resolution of the IP part of the GNS2DNS record.
struct AuthorityChain * ac
Context this activity belongs with.

References Gns2DnsPending::ac, GNS_ResolverHandle::ac_head, GNS_ResolverHandle::ac_tail, AuthorityChain::authority_info, GNS_ResolverHandle::dht_heap_node, AuthorityChain::dns_authority, AuthorityChain::dns_handle, 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(), AuthorityChain::gp_head, AuthorityChain::gp_tail, AuthorityChain::label, GNS_ResolverHandle::leho, GNS_ResolverHandle::name, GNS_ResolverHandle::namecache_qe, GNS_ResolverHandle::prefix, GNS_ResolverHandle::rev_check, Gns2DnsPending::rh, AuthorityChain::rh, rlh_head, rlh_tail, GNS_ResolverHandle::std_resolve, and GNS_ResolverHandle::task_id.

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

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