/*
This file is part of GNUnet.
- (C) 2009, 2010, 2011, 2012, 2013 Christian Grothoff (and other contributing authors)
+ (C) 2011-2013 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
* @brief GNUnet GNS resolver logic
* @author Martin Schanzenbach
* @author Christian Grothoff
+ *
+ * TODO:
+ * - recurive GNS resulution
+ * - recursive DNS resolution
+ * - shortening triggers
+ * - revocation checks (privacy!?)
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_transport_service.h"
-#include "gnunet_dns_service.h"
+#include "gnunet_dnsstub_lib.h"
#include "gnunet_dht_service.h"
#include "gnunet_namestore_service.h"
#include "gnunet_dns_service.h"
#include "gnunet_resolver_service.h"
#include "gnunet_dnsparser_lib.h"
-#include "gns_protocol.h"
#include "gnunet_gns_service.h"
-#include "gns_common.h"
#include "gns.h"
#include "gnunet-service-gns_resolver.h"
-#ifndef WINDOWS
#include "gnunet_vpn_service.h"
-#endif
-
-
-#define DHT_OPERATION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 60)
-
-#define GNUNET_GNS_DEFAULT_LOOKUP_TIMEOUT \
- GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
-
-#define DHT_LOOKUP_TIMEOUT DHT_OPERATION_TIMEOUT
-#define DHT_GNS_REPLICATION_LEVEL 5
-
-#define GNUNET_GNS_MAX_PARALLEL_LOOKUPS 500
-
-#define GNUNET_GNS_MAX_NS_TASKS 500
+/**
+ * Default DHT timeout for lookups.
+ */
+#define DHT_LOOKUP_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 60)
/**
- * Default DHT timeout
+ * Default timeout for DNS lookups.
*/
-#define DHT_LOOKUP_TIMEOUT DHT_OPERATION_TIMEOUT
+#define DNS_LOOKUP_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
/**
* DHT replication level
*/
#define DHT_GNS_REPLICATION_LEVEL 5
+/**
+ * How deep do we allow recursions to go before we abort?
+ */
+#define MAX_RECURSION 256
-/*
- * DLL to hold the authority chain
- * we had to pass in the resolution process
+
+/**
+ * DLL to hold the authority chain we had to pass in the resolution
+ * process.
*/
struct AuthorityChain
{
+ /**
+ * This is a DLL.
+ */
struct AuthorityChain *prev;
- struct AuthorityChain *next;
-
/**
- * the zone hash of the authority
+ * This is a DLL.
*/
- struct GNUNET_CRYPTO_ShortHashCode zone;
+ struct AuthorityChain *next;
/**
- * (local) name of the authority
+ * Resolver handle this entry in the chain belongs to.
*/
- char name[GNUNET_DNSPARSER_MAX_LABEL_LENGTH];
+ struct GNS_ResolverHandle *rh;
/**
- * was the ns entry fresh
+ * label/name corresponding to the authority
*/
- int fresh;
-};
+ char *label;
+
+ /**
+ * #GNUNET_YES if the authority was a GNS authority,
+ * #GNUNET_NO if the authority was a DNS authority.
+ */
+ int gns_authority;
+ /**
+ * Information about the resolver authority for this label.
+ */
+ union
+ {
-/**
- * handle to a resolution process
- */
-struct ResolverHandle;
+ /**
+ * The zone of the GNS authority
+ */
+ struct GNUNET_CRYPTO_EccPublicKey gns_authority;
+ struct
+ {
+ /**
+ * Domain of the DNS resolver that is the authority.
+ * (appended to construct the DNS name to resolve;
+ * this is NOT the DNS name of the DNS server!).
+ */
+ char name[GNUNET_DNSPARSER_MAX_NAME_LENGTH];
-/**
- * processor for a record lookup result
- *
- * @param cls the closure
- * @param rd_count number of results
- * @param rd result data
- */
-typedef void (*RecordLookupProcessor) (void *cls,
- uint32_t rd_count,
- const struct GNUNET_NAMESTORE_RecordData *rd);
+ /**
+ * IP address of the DNS resolver that is authoritative.
+ * (this implementation currently only supports one
+ * IP at a time).
+ */
+ struct sockaddr_storage dns_ip;
+ } dns_authority;
-/**
- * processor for a resolution result
- *
- * @param cls the closure
- * @param rh the resolution handle
- * @param rd_count number of results
- * @param rd result data (array of 'rd_count' records)
- */
-typedef void (*ResolutionResultProcessor) (void *cls,
- struct ResolverHandle *rh,
- uint32_t rd_count,
- const struct GNUNET_NAMESTORE_RecordData *rd);
+ } authority_info;
+
+};
/**
/**
- * Handle to a currenty pending resolution
- * a ResolverHandle is passed to, for example
- * resolve_record_ns to resolve a record in the namestore.
- * On result (positive or negative) the ResolutionResultProcessor
- * is called.
- * If a timeout is set timeout_cont will be called.
- * If no timeout is set (ie timeout forever) then background resolutions
- * might be triggered.
+ * A result we got from DNS.
*/
-struct GNS_ResolverHandle
+struct DnsResult
{
/**
- * DLL
- */
- struct ResolverHandle *next;
-
- /**
- * DLL
- */
- struct ResolverHandle *prev;
-
- /**
- * Last record data found
- */
- struct GNUNET_NAMESTORE_RecordData rd;
-
- /**
- * Number of last record data found
- */
- unsigned int rd_count;
-
- /**
- * The name to resolve
+ * Kept in DLL.
*/
- char name[GNUNET_DNSPARSER_MAX_NAME_LENGTH];
+ struct DnsResult *next;
/**
- * has this query been answered? how many matches
+ * Kept in DLL.
*/
- int answered;
+ struct DnsResult *prev;
/**
- * Use only cache
+ * Binary value stored in the DNS record (appended to this struct)
*/
- int only_cached;
+ const void *data;
/**
- * the authoritative zone to query
+ * Expiration time for the DNS record, 0 if we didn't
+ * get anything useful (i.e. 'gethostbyname' was used).
*/
- struct GNUNET_CRYPTO_ShortHashCode authority;
+ uint64_t expiration_time;
/**
- * the name of the authoritative zone to query
+ * Number of bytes in 'data'.
*/
- char authority_name[GNUNET_DNSPARSER_MAX_LABEL_LENGTH];
+ size_t data_size;
/**
- * a handle for dht lookups. should be NULL if no lookups are in progress
+ * Type of the GNS/DNS record.
*/
- struct GNUNET_DHT_GetHandle *get_handle;
+ uint32_t record_type;
- /**
- * timeout set for this lookup task
- */
- struct GNUNET_TIME_Relative timeout;
+};
- /**
- * a handle to a vpn request
- */
- struct GNUNET_VPN_RedirectionRequest *vpn_handle;
- /**
- * a socket for a dns request
- */
- struct GNUNET_NETWORK_Handle *dns_sock;
+/**
+ * Handle to a currenty pending resolution. On result (positive or
+ * negative) the #GNS_ResultProcessor is called.
+ */
+struct GNS_ResolverHandle
+{
/**
- * a synthesized dns name
+ * DLL
*/
- char dns_name[GNUNET_DNSPARSER_MAX_NAME_LENGTH];
+ struct GNS_ResolverHandle *next;
/**
- * the authoritative dns zone
+ * DLL
*/
- char dns_zone[GNUNET_DNSPARSER_MAX_NAME_LENGTH];
+ struct GNS_ResolverHandle *prev;
/**
- * the address of the DNS server FIXME not needed?
+ * The top-level GNS authoritative zone to query
*/
- struct sockaddr_in dns_addr;
+ struct GNUNET_CRYPTO_EccPublicKey authority_zone;
/**
- * handle to the local stub resolver request
+ * called when resolution phase finishes
*/
- struct GNUNET_RESOLVER_RequestHandle *dns_resolver_handle;
-
+ GNS_ResultProcessor proc;
+
/**
- * select task for DNS
+ * closure passed to proc
*/
- GNUNET_SCHEDULER_TaskIdentifier dns_read_task;
+ void* proc_cls;
/**
- * pointer to raw dns query payload FIXME needs to be freed/NULL
+ * Handle for DHT lookups. should be NULL if no lookups are in progress
*/
- char *dns_raw_packet;
+ struct GNUNET_DHT_GetHandle *get_handle;
/**
- * size of the raw dns query
+ * Handle to a VPN request, NULL if none is active.
*/
- size_t dns_raw_packet_size;
+ struct GNUNET_VPN_RedirectionRequest *vpn_handle;
/**
- * timeout task for the lookup
+ * Socket for a DNS request, NULL if none is active.
*/
- GNUNET_SCHEDULER_TaskIdentifier timeout_task;
+ struct GNUNET_DNSSTUB_RequestSocket *dns_request;
/**
- * continuation to call on timeout
+ * Handle for standard DNS resolution, NULL if none is active.
*/
- GNUNET_SCHEDULER_Task timeout_cont;
+ struct GNUNET_RESOLVER_RequestHandle *std_resolve;
/**
- * closure for timeout cont
+ * Pending Namestore task
*/
- void* timeout_cont_cls;
+ struct GNUNET_NAMESTORE_QueueEntry *namestore_qe;
/**
- * called when resolution phase finishes
- */
- ResolutionResultProcessor proc;
-
- /**
- * closure passed to proc
+ * Heap node associated with this lookup. Used to limit number of
+ * concurrent requests.
*/
- void* proc_cls;
+ struct GNUNET_CONTAINER_HeapNode *dht_heap_node;
/**
* DLL to store the authority chain
*/
- struct AuthorityChain *authority_chain_head;
+ struct AuthorityChain *ac_head;
/**
* DLL to store the authority chain
*/
- struct AuthorityChain *authority_chain_tail;
-
- /**
- * status of the resolution result
- */
- enum ResolutionStatus status;
+ struct AuthorityChain *ac_tail;
/**
- * The provate local zone of this request
+ * Private key of the shorten zone, NULL to not shorten.
*/
- struct GNUNET_CRYPTO_ShortHashCode private_local_zone;
+ struct GNUNET_CRYPTO_EccPrivateKey *shorten_key;
/**
- * private key of an/our authoritative zone
- * can be NULL but automatical PKEY import will not work
+ * ID of a task associated with the resolution process.
*/
- struct GNUNET_CRYPTO_EccPrivateKey *priv_key;
+ GNUNET_SCHEDULER_TaskIdentifier task_id;
/**
- * the heap node associated with this lookup, null if timeout is set
- * used for DHT background lookups.
+ * The name to resolve
*/
- struct GNUNET_CONTAINER_HeapNode *dht_heap_node;
+ char *name;
/**
- * Id for resolution process
+ * DLL of results we got from DNS.
*/
- unsigned long long id;
+ struct DnsResult *dns_result_head;
/**
- * Pending Namestore task
+ * DLL of results we got from DNS.
*/
- struct GNUNET_NAMESTORE_QueueEntry *namestore_task;
-
-};
-
+ struct DnsResult *dns_result_tail;
-/**
- * Handle to a record lookup
- */
-struct RecordLookupHandle
-{
/**
- * the record type to look up
+ * Current offset in 'name' where we are resolving.
*/
- int record_type;
+ size_t name_resolution_pos;
/**
- * the name to look up
+ * Use only cache
*/
- char name[GNUNET_DNSPARSER_MAX_NAME_LENGTH];
+ int only_cached;
/**
- * Method to call on record resolution result
+ * Desired type for the resolution.
*/
- RecordLookupProcessor proc;
+ int record_type;
/**
- * closure to pass to proc
+ * We increment the loop limiter for each step in a recursive
+ * resolution. If it passes our threshold (i.e. due to
+ * self-recursion in the resolution, i.e CNAME fun), we stop.
*/
- void* proc_cls;
+ unsigned int loop_limiter;
};
/**
- * Handle to a pseu lookup
+ * Handle for a PSEU lookup used to shorten names.
*/
struct GetPseuAuthorityHandle
{
struct GetPseuAuthorityHandle *prev;
/**
- * the name to store the zone under
+ * Private key of the (shorten) zone to store the resulting
+ * pseudonym in.
*/
- char name[GNUNET_DNSPARSER_MAX_LABEL_LENGTH];
+ struct GNUNET_CRYPTO_EccPrivateKey shorten_zone_key;
/**
- * test name to store the zone under
+ * Original label (used if no PSEU record is found).
*/
- char test_name[GNUNET_DNSPARSER_MAX_LABEL_LENGTH];
-
- /**
- * the zone of our authority
- */
- struct GNUNET_CRYPTO_ShortHashCode our_zone;
-
- /**
- * the private key of the zone to store the pseu in
- */
- struct GNUNET_CRYPTO_EccPrivateKey *key;
+ char label[GNUNET_DNSPARSER_MAX_LABEL_LENGTH + 1];
/**
- * a handle for dht lookups. should be NULL if no lookups are in progress
+ * Label we are currently trying out (during #perform_pseu_lookup).
*/
- struct GNUNET_DHT_GetHandle *get_handle;
+ char *current_label;
/**
- * timeout task for lookup
+ * The zone for which we are trying to find the PSEU record.
*/
- GNUNET_SCHEDULER_TaskIdentifier timeout;
+ struct GNUNET_CRYPTO_EccPublicKey target_zone;
/**
- * Authority to shorten
+ * Handle for DHT lookups. Should be NULL if no lookups are in progress
*/
- struct AuthorityChain *auth;
+ struct GNUNET_DHT_GetHandle *get_handle;
/**
- * handle to namestore request
+ * Handle to namestore request
*/
- struct GNUNET_NAMESTORE_QueueEntry* namestore_task;
-};
-
+ struct GNUNET_NAMESTORE_QueueEntry *namestore_task;
-/**
- * Namestore queue entries in background
- */
-struct NamestoreBGTask
-{
/**
- * node in heap
+ * Task to abort DHT lookup operation.
*/
- struct GNUNET_CONTAINER_HeapNode *node;
+ GNUNET_SCHEDULER_TaskIdentifier timeout_task;
- /**
- * queue entry
- */
- struct GNUNET_NAMESTORE_QueueEntry *qe;
};
static struct GNUNET_DHT_Handle *dht_handle;
/**
- * Heap for parallel DHT lookups
+ * Handle to perform DNS lookups.
*/
-static struct GNUNET_CONTAINER_Heap *dht_lookup_heap;
+static struct GNUNET_DNSSTUB_Context *dns_handle;
/**
- * Heap for namestore queues
+ * Heap for limiting parallel DHT lookups
*/
-static struct GNUNET_CONTAINER_Heap *ns_task_heap;
+static struct GNUNET_CONTAINER_Heap *dht_lookup_heap;
/**
- * Maximum amount of parallel queries in background
+ * Maximum amount of parallel queries to the DHT
*/
static unsigned long long max_allowed_background_queries;
/**
- * Maximum amount of parallel namestore tasks in background
+ * Head of PSEU/shorten operations list.
*/
-static unsigned long long max_allowed_ns_tasks;
+struct GetPseuAuthorityHandle *gph_head;
/**
- * Whether or not to ignore pending records
+ * Tail of PSEU/shorten operations list.
*/
-static int ignore_pending_records;
+struct GetPseuAuthorityHandle *gph_tail;
/**
- * Resolver lookup list
+ * Head of resolver lookup list
*/
-static struct ResolverHandle *rlh_head;
+static struct GNS_ResolverHandle *rlh_head;
/**
- * Resolver lookup list
+ * Tail of resolver lookup list
*/
-static struct ResolverHandle *rlh_tail;
+static struct GNS_ResolverHandle *rlh_tail;
/**
* Global configuration.
*/
static const struct GNUNET_CONFIGURATION_Handle *cfg;
-/**
- * a resolution identifier pool variable
- * This is a non critical identifier useful for debugging
- */
-static unsigned long long rid_gen;
-
/**
* Check if name is in srv format (_x._y.xxx)
* even though they consist of multiple labels.
*
* Examples:
- * a.b.gads = not canonical
+ * a.b.gnu = not canonical
* a = canonical
* _foo._srv = canonical
* _f.bar = not canonical
}
-static void
-free_get_pseu_authority_handle (struct GetPseuAuthorityHandle *gph)
-{
- gph->namestore_task = NULL;
- GNUNET_free (gph->auth);
- GNUNET_CRYPTO_ecc_key_free (gph->key);
- GNUNET_CONTAINER_DLL_remove (gph_head, gph_tail, gph);
- GNUNET_free (gph);
-}
+/* ******************** Shortening logic ************************ */
/**
- * Callback that shortens authorities
+ * Cleanup a 'struct GetPseuAuthorityHandle', terminating all
+ * pending activities.
*
- * @param gph the handle containing the name to shorten
+ * @param gph handle to terminate
*/
static void
-shorten_authority_chain (struct GetPseuAuthorityHandle *gph);
+free_get_pseu_authority_handle (struct GetPseuAuthorityHandle *gph)
+{
+ if (NULL != gph->get_handle)
+ {
+ GNUNET_DHT_get_stop (gph->get_handle);
+ gph->get_handle = NULL;
+ }
+ if (NULL != gph->namestore_task)
+ {
+ GNUNET_NAMESTORE_cancel (gph->namestore_task);
+ gph->namestore_task = NULL;
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != gph->timeout_task)
+ {
+ GNUNET_SCHEDULER_cancel (gph->timeout_task);
+ gph->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ GNUNET_CONTAINER_DLL_remove (gph_head, gph_tail, gph);
+ GNUNET_free_non_null (gph->current_label);
+ GNUNET_free (gph);
+}
/**
* @param emsg unused
*/
static void
-create_pkey_cont (void* cls, int32_t success, const char* emsg)
+create_pkey_cont (void* cls,
+ int32_t success,
+ const char *emsg)
{
- //FIXME do sth with error
struct GetPseuAuthorityHandle* gph = cls;
+ gph->namestore_task = NULL;
free_get_pseu_authority_handle (gph);
}
/**
* Namestore calls this function if we have record for this name.
- * (or with rd_count=0 to indicate no matches)
+ * (or with rd_count=0 to indicate no matches).
*
* @param cls the pending query
- * @param key the key of the zone we did the lookup
- * @param expiration expiration date of the namestore entry
- * @param name the name for which we need an authority
* @param rd_count the number of records with 'name'
* @param rd the record data
- * @param signature the signature of the authority for the record data
*/
static void
-process_pseu_lookup_ns (void* cls,
- const struct GNUNET_CRYPTO_EccPublicKey *key,
- struct GNUNET_TIME_Absolute expiration,
- const char *name, unsigned int rd_count,
- const struct GNUNET_NAMESTORE_RecordData *rd,
- const struct GNUNET_CRYPTO_EccSignature *signature)
+process_pseu_lookup_ns (void *cls,
+ unsigned int rd_count,
+ const struct GNUNET_NAMESTORE_RecordData *rd);
+
+
+/**
+ * We obtained a result for our query to the shorten zone from
+ * the namestore. Try to decrypt.
+ *
+ * @param cls the handle to our shorten operation
+ * @param block resulting encrypted block
+ */
+static void
+process_pseu_block_ns (void *cls,
+ const struct GNUNET_NAMESTORE_Block *block)
{
- struct GetPseuAuthorityHandle* gph = cls;
+ struct GetPseuAuthorityHandle *gph = cls;
+ struct GNUNET_CRYPTO_EccPublicKey pub;
+
+ gph->namestore_task = NULL;
+ if (NULL == block)
+ {
+ process_pseu_lookup_ns (gph, 0, NULL);
+ return;
+ }
+ GNUNET_CRYPTO_ecc_key_get_public (&gph->shorten_zone_key,
+ &pub);
+ if (GNUNET_OK !=
+ GNUNET_NAMESTORE_block_decrypt (block,
+ &pub,
+ gph->current_label,
+ &process_pseu_lookup_ns,
+ gph))
+ {
+ GNUNET_break (0);
+ free_get_pseu_authority_handle (gph);
+ return;
+ }
+}
+
+
+/**
+ * Lookup in the namestore for the shorten zone the given label.
+ *
+ * @param gph the handle to our shorten operation
+ * @param label the label to lookup
+ */
+static void
+perform_pseu_lookup (struct GetPseuAuthorityHandle *gph,
+ const char *label)
+{
+ struct GNUNET_CRYPTO_EccPublicKey pub;
+ struct GNUNET_HashCode query;
+
+ GNUNET_CRYPTO_ecc_key_get_public (&gph->shorten_zone_key,
+ &pub);
+ GNUNET_free_non_null (gph->current_label);
+ gph->current_label = GNUNET_strdup (label);
+ GNUNET_NAMESTORE_query_from_public_key (&pub,
+ label,
+ &query);
+ gph->namestore_task = GNUNET_NAMESTORE_lookup_block (namestore_handle,
+ &query,
+ &process_pseu_block_ns,
+ gph);
+}
+
+
+/**
+ * Namestore calls this function if we have record for this name.
+ * (or with rd_count=0 to indicate no matches).
+ *
+ * @param cls the pending query
+ * @param rd_count the number of records with 'name'
+ * @param rd the record data
+ */
+static void
+process_pseu_lookup_ns (void *cls,
+ unsigned int rd_count,
+ const struct GNUNET_NAMESTORE_RecordData *rd)
+{
+ struct GetPseuAuthorityHandle *gph = cls;
struct GNUNET_NAMESTORE_RecordData new_pkey;
gph->namestore_task = NULL;
if (rd_count > 0)
{
GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "GNS_AUTO_PSEU: Name %s already taken in NS!\n", name);
- free_get_pseu_authority_handle (gph);
+ "Name `%s' already taken, cannot shorten.\n",
+ gph->current_label);
+ /* if this was not yet the original label, try one more
+ time, this time not using PSEU but the original label */
+ if (0 == strcmp (gph->current_label,
+ gph->label))
+ {
+ free_get_pseu_authority_handle (gph);
+ }
+ else
+ {
+ perform_pseu_lookup (gph, gph->label);
+ }
return;
}
-
- /* name is free */
+ /* name is available */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_AUTO_PSEU: Name %s not taken in NS! Adding\n",
- gph->test_name);
-
+ "Shortening `%s' to `%s'\n",
+ GNUNET_NAMESTORE_z2s (&gph->target_zone),
+ gph->current_label);
new_pkey.expiration_time = UINT64_MAX;
- new_pkey.data_size = sizeof (struct GNUNET_CRYPTO_ShortHashCode);
- new_pkey.data = &gph->auth->zone;
+ new_pkey.data_size = sizeof (struct GNUNET_CRYPTO_EccPublicKey);
+ new_pkey.data = &gph->target_zone;
new_pkey.record_type = GNUNET_NAMESTORE_TYPE_PKEY;
new_pkey.flags = GNUNET_NAMESTORE_RF_AUTHORITY
| GNUNET_NAMESTORE_RF_PRIVATE
| GNUNET_NAMESTORE_RF_PENDING;
- gph->namestore_task = GNUNET_NAMESTORE_record_put_by_authority (namestore_handle,
- gph->key,
- gph->test_name,
- 1,
- &new_pkey,
- &create_pkey_cont,
- gph);
+ gph->namestore_task
+ = GNUNET_NAMESTORE_records_store (namestore_handle,
+ &gph->shorten_zone_key,
+ gph->current_label,
+ 1, &new_pkey,
+ &create_pkey_cont, gph);
}
/**
- * process result of a dht pseu lookup
+ * Process result of a DHT lookup for a PSEU record.
*
- * @param gph the handle
- * @param name the pseu result or NULL
+ * @param gph the handle to our shorten operation
+ * @param pseu the pseu result or NULL
*/
static void
process_pseu_result (struct GetPseuAuthorityHandle* gph,
- const char* name)
+ const char *pseu)
{
- if (NULL == name)
+ if (NULL == pseu)
{
+ /* no PSEU found, try original label */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_AUTO_PSEU: No PSEU, no shorten. Finished.\n");
- free_get_pseu_authority_handle (gph);
+ "No PSEU found, trying original label `%s' instead.\n",
+ gph->label);
+ perform_pseu_lookup (gph, gph->label);
return;
- }
-
- memcpy (gph->test_name, name, strlen(name) + 1);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_AUTO_PSEU: Checking %s for collision in NS\n",
- gph->test_name);
- /**
- * Check for collision
- */
- gph->namestore_task = GNUNET_NAMESTORE_lookup_record (namestore_handle,
- &gph->our_zone,
- gph->test_name,
- GNUNET_NAMESTORE_TYPE_ANY,
- &process_pseu_lookup_ns,
- gph);
+ }
+ /* check if 'pseu' is taken */
+ perform_pseu_lookup (gph, pseu);
}
/**
- * Start shortening algorithm using auth as
- * authority chain
+ * Handle timeout for DHT request during shortening.
*
- * @param auth the authorities that were resolved
- * @param key the private key for PKEY import
+ * @param cls the request handle as closure
+ * @param tc the task context
*/
static void
-start_shorten (struct AuthorityChain *auth,
- const struct GNUNET_CRYPTO_EccPrivateKey *key)
+handle_auth_discovery_timeout (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- struct GetPseuAuthorityHandle *gph;
- struct GNUNET_CRYPTO_EccPublicKey pkey;
-
- GNUNET_CRYPTO_ecc_key_get_public (key, &pkey);
- gph = GNUNET_new (struct GetPseuAuthorityHandle);
- gph->key = GNUNET_new (struct GNUNET_CRYPTO_EccPrivateKey);
- *gph->key = *key;
- if (NULL == gph->key)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "Failed to decode ECC key on shorten\n");
- GNUNET_free (gph);
- return;
- }
- GNUNET_CRYPTO_short_hash (&pkey,
- sizeof (struct GNUNET_CRYPTO_EccPublicKey),
- &gph->our_zone);
- gph->auth = GNUNET_malloc (sizeof (struct AuthorityChain));
- memcpy (gph->auth, auth, sizeof (struct AuthorityChain));
- GNUNET_CONTAINER_DLL_insert (gph_head, gph_tail, gph);
- shorten_authority_chain (gph);
+ struct GetPseuAuthorityHandle *gph = cls;
+
+ gph->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "DHT lookup for PSEU query timed out.\n");
+ GNUNET_DHT_get_stop (gph->get_handle);
+ gph->get_handle = NULL;
+ process_pseu_result (gph, NULL);
}
/**
- * Initialize the resolver
+ * Handle decrypted records from DHT result.
*
- * @param nh the namestore handle
- * @param dh the dht handle
- * @param lz the local zone's hash
- * @param c configuration handle
- * @param max_bg_queries maximum number of parallel background queries in dht
- * @param ignore_pending ignore records that still require user confirmation
- * on lookup
- * @return GNUNET_OK on success
+ * @param cls closure with our 'struct GetPseuAuthorityHandle'
+ * @param rd_count number of entries in 'rd' array
+ * @param rd array of records with data to store
*/
-int
-GNS_resolver_init (struct GNUNET_NAMESTORE_Handle *nh,
- struct GNUNET_DHT_Handle *dh,
- const struct GNUNET_CONFIGURATION_Handle *c,
- unsigned long long max_bg_queries,
- int ignore_pending)
+static void
+process_auth_records (void *cls,
+ unsigned int rd_count,
+ const struct GNUNET_NAMESTORE_RecordData *rd)
{
- if ( (NULL == nh) ||
- (NULL == dh) )
- return GNUNET_SYSERR;
-
- cfg = c;
- namestore_handle = nh;
- dht_handle = dh;
- local_zone = lz;
- dht_lookup_heap =
- GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
- ns_task_heap =
- GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
- max_allowed_background_queries = max_bg_queries;
- max_allowed_ns_tasks = GNUNET_GNS_MAX_NS_TASKS;
- ignore_pending_records = ignore_pending;
- GNUNET_RESOLVER_connect (cfg);
- return GNUNET_OK;
+ struct GetPseuAuthorityHandle *gph = cls;
+ unsigned int i;
+
+ for (i=0; i < rd_count; i++)
+ {
+ if (GNUNET_NAMESTORE_TYPE_PSEU == rd[i].record_type)
+ {
+ /* found pseu */
+ process_pseu_result (gph,
+ (const char *) rd[i].data);
+ return;
+ }
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "No PSEU record found in DHT reply.\n");
+ process_pseu_result (gph, NULL);
}
/**
- * finish lookup
+ * Function called when we find a PSEU entry in the DHT
*
- * @param rh resolver handle
- * @param rlh record lookup handle
- * @param rd_count number of results
- * @param rd results
- */
-static void
-finish_lookup (struct ResolverHandle *rh,
- struct RecordLookupHandle* rlh,
- unsigned int rd_count,
- const struct GNUNET_NAMESTORE_RecordData *rd);
-
-
-/**
- * Helper function to free resolver handle
- *
- * @param rh the handle to free
- */
-static void
-free_resolver_handle (struct ResolverHandle* rh)
-{
- struct AuthorityChain *ac;
- struct AuthorityChain *ac_next;
-
- if (NULL == rh)
- return;
-
- ac_next = rh->authority_chain_head;
- while (NULL != (ac = ac_next))
- {
- ac_next = ac->next;
- GNUNET_free (ac);
- }
-
- if (NULL != rh->get_handle)
- GNUNET_DHT_get_stop (rh->get_handle);
- if (NULL != rh->dns_raw_packet)
- GNUNET_free (rh->dns_raw_packet);
- if (NULL != rh->namestore_task)
- {
- GNUNET_NAMESTORE_cancel (rh->namestore_task);
- rh->namestore_task = NULL;
- }
- if (GNUNET_SCHEDULER_NO_TASK != rh->dns_read_task)
- GNUNET_SCHEDULER_cancel (rh->dns_read_task);
- if (GNUNET_SCHEDULER_NO_TASK != rh->timeout_task)
- GNUNET_SCHEDULER_cancel (rh->timeout_task);
- if (NULL != rh->dns_sock)
- GNUNET_NETWORK_socket_close (rh->dns_sock);
- if (NULL != rh->dns_resolver_handle)
- GNUNET_RESOLVER_request_cancel (rh->dns_resolver_handle);
- if (NULL != rh->rd.data)
- GNUNET_free ((void*)(rh->rd.data));
- if (NULL != rh->dht_heap_node)
- GNUNET_CONTAINER_heap_remove_node (rh->dht_heap_node);
- GNUNET_free (rh);
-}
-
-
-/**
- * finish shorten
- *
- * @param rh resolver handle
- * @param nsh name shorten handle
- */
-static void
-finish_shorten (struct ResolverHandle *rh,
- struct NameShortenHandle *nsh);
-
-
-/**
- * finish get auth
- *
- * @param rh resolver handle
- * @param nah get name authority handle
+ * @param cls the request handle
+ * @param exp lifetime
+ * @param key the key the record was stored under
+ * @param get_path get path
+ * @param get_path_length get path length
+ * @param put_path put path
+ * @param put_path_length put path length
+ * @param type the block type
+ * @param size the size of the record
+ * @param data the record data
*/
static void
-finish_get_auth (struct ResolverHandle *rh,
- struct GetNameAuthorityHandle* rlh);
-
-
-/**
- * Shutdown resolver
- */
-void
-GNS_resolver_done ()
+process_auth_discovery_dht_result (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)
{
- struct GetPseuAuthorityHandle *tmp;
- struct ResolverHandle *rh;
- struct NamestoreBGTask *nbg;
+ struct GetPseuAuthorityHandle *gph = cls;
+ const struct GNUNET_NAMESTORE_Block *block;
- while (NULL != (tmp = gph_head))
- {
- if (tmp->get_handle != NULL)
- {
- GNUNET_DHT_get_stop (tmp->get_handle);
- tmp->get_handle = NULL;
- }
- if (tmp->timeout != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (tmp->timeout);
- tmp->timeout = GNUNET_SCHEDULER_NO_TASK;
- }
- if (NULL != tmp->namestore_task)
- {
- GNUNET_NAMESTORE_cancel (tmp->namestore_task);
- tmp->namestore_task = NULL;
- }
- free_get_pseu_authority_handle (tmp);
- }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Got DHT result for PSEU request\n");
+ GNUNET_DHT_get_stop (gph->get_handle);
+ gph->get_handle = NULL;
+ GNUNET_SCHEDULER_cancel (gph->timeout_task);
+ gph->timeout_task = GNUNET_SCHEDULER_NO_TASK;
- while (NULL != rlh_head)
- {
- finish_lookup (rlh_head, rlh_head->proc_cls, 0, NULL);
- }
- while (NULL != nsh_head)
+ if (NULL == data)
{
- finish_shorten (nsh_head, nsh_head->proc_cls);
+ /* is this allowed!? */
+ GNUNET_break (0);
+ process_pseu_result (gph, NULL);
+ return;
}
- while (NULL != nah_head)
+ if (size < sizeof (struct GNUNET_NAMESTORE_Block))
{
- finish_get_auth (nah_head, nah_head->proc_cls);
+ /* how did this pass DHT block validation!? */
+ GNUNET_break (0);
+ process_pseu_result (gph, NULL);
+ return;
}
-
- while (NULL != (rh = GNUNET_CONTAINER_heap_remove_root(dht_lookup_heap)))
+ block = data;
+ if (size !=
+ ntohs (block->purpose.size) +
+ sizeof (struct GNUNET_CRYPTO_EccPublicKey) +
+ sizeof (struct GNUNET_CRYPTO_EccSignature))
{
- GNUNET_free (rh);
+ /* how did this pass DHT block validation!? */
+ GNUNET_break (0);
+ process_pseu_result (gph, NULL);
+ return;
}
- GNUNET_CONTAINER_heap_destroy (dht_lookup_heap);
- dht_lookup_heap = NULL;
-
- while (NULL != (nbg = GNUNET_CONTAINER_heap_remove_root(ns_task_heap)))
+ if (GNUNET_OK !=
+ GNUNET_NAMESTORE_block_decrypt (block,
+ &gph->target_zone,
+ GNUNET_GNS_TLD_PLUS,
+ &process_auth_records,
+ gph))
{
- GNUNET_NAMESTORE_cancel (nbg->qe);
- GNUNET_free (nbg);
+ /* other peer encrypted invalid block, complain */
+ GNUNET_break_op (0);
+ process_pseu_result (gph, NULL);
+ return;
}
- GNUNET_CONTAINER_heap_destroy (ns_task_heap);
- ns_task_heap = NULL;
-
}
/**
- * Callback when record data is put into namestore
+ * Callback called by namestore for a zone to name result. We're
+ * trying to see if a short name for a given zone already exists.
*
* @param cls the closure
- * @param success GNUNET_OK on success
- * @param emsg the error message. NULL if SUCCESS==GNUNET_OK
- */
-void
-on_namestore_record_put_result (void *cls,
- int32_t success,
- const char *emsg)
-{
- struct NamestoreBGTask *nbg = cls;
-
- GNUNET_CONTAINER_heap_remove_node (nbg->node);
- GNUNET_free (nbg);
-
- if (GNUNET_NO == success)
- {
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "GNS_NS: records already in namestore\n");
- return;
- }
- else if (GNUNET_YES == success)
- {
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "GNS_NS: records successfully put in namestore\n");
- return;
- }
-
- GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
- "GNS_NS: Error putting records into namestore: %s\n", emsg);
-}
-
-
-/**
- * Lookup timeout task
- *
- * @param cls the ResolverHandle for the task that timed out
- * @param tc the task context
- */
-static void
-handle_lookup_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct ResolverHandle *rh = cls;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Lookup timeout for request %llu triggered\n",
- rh->id);
- if (NULL != rh->timeout_cont)
- rh->timeout_cont (rh->timeout_cont_cls, tc);
-}
-
-
-/**
- * Processor for background lookups in the DHT
- *
- * @param cls closure (NULL)
- * @param rd_count number of records found (not 0)
- * @param rd record data
- */
-static void
-background_lookup_result_processor (void *cls,
- uint32_t rd_count,
- const struct GNUNET_NAMESTORE_RecordData *rd)
-{
- //We could do sth verbose/more useful here but it doesn't make any difference
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_BG: background dht lookup finished. (%d results)\n",
- rd_count);
-}
-
-
-/**
- * Handle timeout for DHT requests
- *
- * @param cls the request handle as closure
- * @param tc the task context
+ * @param zone_key the zone we queried
+ * @param name the name found or NULL
+ * @param rd_len number of records for the name
+ * @param rd the record data (PKEY) for the name
*/
static void
-dht_lookup_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+process_zone_to_name_discover (void *cls,
+ const struct GNUNET_CRYPTO_EccPrivateKey *zone_key,
+ const char *name,
+ unsigned int rd_len,
+ const struct GNUNET_NAMESTORE_RecordData *rd)
{
- struct ResolverHandle *rh = cls;
- struct RecordLookupHandle *rlh = rh->proc_cls;
- char new_name[GNUNET_DNSPARSER_MAX_NAME_LENGTH];
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_REC-%llu: dht lookup for query %s (%s) timed out.\n",
- rh->id, rh->name,
- GNUNET_STRINGS_relative_time_to_string (rh->timeout,
- GNUNET_YES));
- /**
- * Start resolution in bg
- */
- GNUNET_snprintf (new_name, GNUNET_DNSPARSER_MAX_NAME_LENGTH, "%s.%s",
- rh->name, GNUNET_GNS_TLD);
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_REC-%llu: Starting background lookup for %s type %d\n",
- rh->id, new_name, rlh->record_type);
+ struct GetPseuAuthorityHandle* gph = cls;
+ struct GNUNET_HashCode lookup_key;
- gns_resolver_lookup_record (rh->authority,
- rh->private_local_zone,
- rlh->record_type,
- new_name,
- NULL,
- GNUNET_TIME_UNIT_FOREVER_REL,
- GNUNET_NO,
- &background_lookup_result_processor,
- NULL);
-
- rh->timeout_task = GNUNET_SCHEDULER_NO_TASK;
-
- GNUNET_DHT_get_stop (rh->get_handle);
- rh->get_handle = NULL;
- rh->proc (rh->proc_cls, rh, 0, NULL);
-}
-
-
-/**
- * Function called when we get a result from the dht
- * for our record query
- *
- * @param cls the request handle
- * @param exp lifetime
- * @param key the key the record was stored under
- * @param get_path get path
- * @param get_path_length get path length
- * @param put_path put path
- * @param put_path_length put path length
- * @param type the block type
- * @param size the size of the record
- * @param data the record data
- */
-static void
-process_record_result_dht (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)
-{
- struct ResolverHandle *rh = cls;
- struct RecordLookupHandle *rlh = rh->proc_cls;
- const struct GNSNameRecordBlock *nrb = data;
- uint32_t num_records;
- const char* name;
- const char* rd_data;
- uint32_t i;
- size_t rd_size;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_REC-%llu: got dht result (size=%d)\n", rh->id, size);
- /* stop lookup and timeout task */
- GNUNET_DHT_get_stop (rh->get_handle);
- rh->get_handle = NULL;
- if (rh->dht_heap_node != NULL)
- {
- GNUNET_CONTAINER_heap_remove_node (rh->dht_heap_node);
- rh->dht_heap_node = NULL;
- }
- if (rh->timeout_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (rh->timeout_task);
- rh->timeout_task = GNUNET_SCHEDULER_NO_TASK;
- }
- rh->get_handle = NULL;
- name = (const char*) &nrb[1];
- num_records = ntohl (nrb->rd_count);
+ gph->namestore_task = NULL;
+ if (0 != rd_len)
{
- struct GNUNET_NAMESTORE_RecordData rd[num_records];
- struct NamestoreBGTask *ns_heap_root;
- struct NamestoreBGTask *namestore_bg_task;
-
- rd_data = &name[strlen (name) + 1];
- rd_size = size - strlen (name) - 1 - sizeof (struct GNSNameRecordBlock);
- if (GNUNET_SYSERR ==
- GNUNET_NAMESTORE_records_deserialize (rd_size,
- rd_data,
- num_records,
- rd))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "GNS_PHASE_REC-%llu: Error deserializing data!\n", rh->id);
- rh->proc (rh->proc_cls, rh, 0, NULL);
- return;
- }
- for (i = 0; i < num_records; i++)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_REC-%llu: Got name: %s (wanted %s)\n",
- rh->id, name, rh->name);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_REC-%llu: Got type: %d (wanted %d)\n",
- rh->id, rd[i].record_type, rlh->record_type);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_REC-%llu: Got data length: %d\n",
- rh->id, rd[i].data_size);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_REC-%llu: Got flag %d\n",
- rh->id, rd[i].flags);
-
- if ((strcmp (name, rh->name) == 0) &&
- (rd[i].record_type == rlh->record_type))
- rh->answered++;
-
- }
-
- /**
- * FIXME check pubkey against existing key in namestore?
- * https://gnunet.org/bugs/view.php?id=2179
- */
- if (max_allowed_ns_tasks <=
- GNUNET_CONTAINER_heap_get_size (ns_task_heap))
- {
- ns_heap_root = GNUNET_CONTAINER_heap_remove_root (ns_task_heap);
- GNUNET_NAMESTORE_cancel (ns_heap_root->qe);
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_REC-%llu: Replacing oldest background ns task\n",
- rh->id);
- }
-
- /* Save to namestore */
+ /* we found a match in our own zone */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_REC-%llu: Caching record for %s\n",
- rh->id, name);
- namestore_bg_task = GNUNET_malloc (sizeof (struct NamestoreBGTask));
- namestore_bg_task->qe = GNUNET_NAMESTORE_record_put (namestore_handle,
- &nrb->public_key,
- name,
- exp,
- num_records,
- rd,
- &nrb->signature,
- &on_namestore_record_put_result, //cont
- namestore_bg_task);
-
- namestore_bg_task->node = GNUNET_CONTAINER_heap_insert (ns_task_heap,
- namestore_bg_task,
- GNUNET_TIME_absolute_get().abs_value_us);
- if (0 < rh->answered)
- rh->proc (rh->proc_cls, rh, num_records, rd);
- else
- rh->proc (rh->proc_cls, rh, 0, NULL);
+ "Shortening aborted, name `%s' already reserved for the zone\n",
+ name);
+ free_get_pseu_authority_handle (gph);
+ return;
}
+ /* record does not yet exist, go into DHT to find PSEU record */
+ GNUNET_NAMESTORE_query_from_public_key (&gph->target_zone,
+ GNUNET_GNS_TLD_PLUS,
+ &lookup_key);
+ gph->timeout_task = GNUNET_SCHEDULER_add_delayed (DHT_LOOKUP_TIMEOUT,
+ &handle_auth_discovery_timeout,
+ gph);
+ gph->get_handle = GNUNET_DHT_get_start (dht_handle,
+ GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
+ &lookup_key,
+ DHT_GNS_REPLICATION_LEVEL,
+ GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
+ NULL, 0,
+ &process_auth_discovery_dht_result,
+ gph);
}
/**
- * Start DHT lookup for a (name -> query->record_type) record in
- * rh->authority's zone
+ * Start shortening algorithm, try to allocate a nice short
+ * canonical name for @a pub in @a shorten_zone, using
+ * @a original_label as one possible suggestion.
*
- * @param rh the pending gns query context
+ * @param original_label original label for the zone
+ * @param pub public key of the zone to shorten
+ * @param shorten_zone private key of the target zone for the new record
*/
static void
-resolve_record_dht (struct ResolverHandle *rh)
+start_shorten (const char *original_label,
+ const struct GNUNET_CRYPTO_EccPublicKey *pub,
+ const struct GNUNET_CRYPTO_EccPrivateKey *shorten_zone)
{
- struct RecordLookupHandle *rlh = rh->proc_cls;
- uint32_t xquery;
- struct GNUNET_HashCode lookup_key;
- struct ResolverHandle *rh_heap_root;
-
- GNUNET_GNS_get_key_for_record (rh->name, &rh->authority, &lookup_key);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_REC-%llu: starting dht lookup for %s with key: %s\n",
- rh->id, rh->name, GNUNET_h2s (&lookup_key));
-
- rh->dht_heap_node = NULL;
-
- if (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us != rh->timeout.rel_value_us)
- {
- /**
- * Update timeout if necessary
- */
- if (GNUNET_SCHEDULER_NO_TASK == rh->timeout_task)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_REC-%llu: Adjusting timeout to %s/2\n",
- rh->id,
- GNUNET_STRINGS_relative_time_to_string (rh->timeout, GNUNET_YES));
- /*
- * Set timeout for authority lookup phase to 1/2
- */
- rh->timeout_task = GNUNET_SCHEDULER_add_delayed (
- GNUNET_TIME_relative_divide (rh->timeout, 2),
- &handle_lookup_timeout,
- rh);
- }
- rh->timeout_cont = &dht_lookup_timeout;
- rh->timeout_cont_cls = rh;
- }
- else
+ struct GetPseuAuthorityHandle *gph;
+
+ if (strlen (original_label) > GNUNET_DNSPARSER_MAX_LABEL_LENGTH)
{
- if (max_allowed_background_queries <=
- GNUNET_CONTAINER_heap_get_size (dht_lookup_heap))
- {
- rh_heap_root = GNUNET_CONTAINER_heap_remove_root (dht_lookup_heap);
- GNUNET_DHT_get_stop (rh_heap_root->get_handle);
- rh_heap_root->get_handle = NULL;
- rh_heap_root->dht_heap_node = NULL;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_REC-%llu: Replacing oldest background query for %s\n",
- rh->id, rh_heap_root->name);
- rh_heap_root->proc (rh_heap_root->proc_cls,
- rh_heap_root,
- 0,
- NULL);
- }
- rh->dht_heap_node = GNUNET_CONTAINER_heap_insert (dht_lookup_heap,
- rh,
- GNUNET_TIME_absolute_get ().abs_value_us);
+ GNUNET_break (0);
+ return;
}
+ gph = GNUNET_new (struct GetPseuAuthorityHandle);
+ gph->shorten_zone_key = *shorten_zone;
+ gph->target_zone = *pub;
+ strcpy (gph->label, original_label);
+ GNUNET_CONTAINER_DLL_insert (gph_head, gph_tail, gph);
+ /* first, check if we *already* have a record for this zone */
+ gph->namestore_task = GNUNET_NAMESTORE_zone_to_name (namestore_handle,
+ shorten_zone,
+ pub,
+ &process_zone_to_name_discover,
+ gph);
+}
- xquery = htonl (rlh->record_type);
- GNUNET_assert (rh->get_handle == NULL);
- rh->get_handle = GNUNET_DHT_get_start (dht_handle,
- GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
- &lookup_key,
- DHT_GNS_REPLICATION_LEVEL,
- GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
- &xquery,
- sizeof (xquery),
- &process_record_result_dht,
- rh);
+/* ************************** Resolution **************************** */
-}
+#if 0
/**
}
-#ifndef WINDOWS
/**
* VPN redirect result callback
*
rh->id);
rh->proc (rh->proc_cls, rh, 0, NULL);
}
-#endif
/**
}
-/**
- * Sends a UDP dns query to a nameserver specified in the rh
- *
- * @param rh the resolver handle
- */
-static void
-send_dns_packet (struct ResolverHandle *rh);
-
-
-/**
- * Read DNS response
- *
- * @param cls the ResolverHandle for this lookup
- * @param addr the sockaddr
- * @param addrlen the socket address length
- */
-static void
-handle_dns_resolver (void *cls,
- const struct sockaddr *addr,
- socklen_t addrlen)
-{
- struct ResolverHandle *rh = cls;
- struct RecordLookupHandle *rlh = rh->proc_cls;
- struct GNUNET_NAMESTORE_RecordData rd;
- struct sockaddr_in *sai;
- struct sockaddr_in6 *sai6;
-
- if (NULL == addr)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No address found in DNS!\n");
- finish_lookup (rh, rlh, 0, NULL);
- return;
- }
-
- if (sizeof (struct sockaddr_in) == addrlen)
- {
- sai = (struct sockaddr_in*) addr;
- rd.record_type = GNUNET_DNSPARSER_TYPE_A;
- rd.data_size = sizeof (struct in_addr);
- rd.data = &sai->sin_addr;
- }
- else if (sizeof (struct sockaddr_in6) == addrlen)
- {
- sai6 = (struct sockaddr_in6*) addr;
- rd.record_type = GNUNET_DNSPARSER_TYPE_AAAA;
- rd.data_size = sizeof (struct in6_addr);
- rd.data = &sai6->sin6_addr;
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Address length is garbage!\n");
- finish_lookup (rh, rlh, 0, NULL);
- return;
- }
- rd.expiration_time = UINT64_MAX; /* FIXME: should probably pick something shorter */
- rd.flags = 0;
- finish_lookup (rh, rlh, 1, &rd);
-}
-
-
-/**
- * Resolve DNS name via local stub resolver
- *
- * @param rh the resolver handle
- */
-static void
-resolve_dns_name (struct ResolverHandle *rh)
-{
- struct RecordLookupHandle *rlh = rh->proc_cls;
- int af;
-
- if ((GNUNET_DNSPARSER_TYPE_A != rlh->record_type) &&
- (GNUNET_DNSPARSER_TYPE_AAAA != rlh->record_type))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Can only resolve A/AAAA via stub... abort\n");
- finish_lookup (rh, rlh, 0, NULL);
- return;
- }
-
- if (GNUNET_DNSPARSER_TYPE_A == rlh->record_type)
- af = AF_INET;
- else
- af = AF_INET6;
-
- rh->dns_resolver_handle = GNUNET_RESOLVER_ip_get (rh->dns_name,
- af,
- rh->timeout,
- &handle_dns_resolver,
- rh);
-}
-
-
-/**
- * Read DNS packet from UDP socket and process the reply.
- *
- * @param cls the resolver handle
- * @param tc task context
- */
-static void
-read_dns_response (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct ResolverHandle *rh = cls;
- struct RecordLookupHandle *rlh = rh->proc_cls;
- char buf[UINT16_MAX];
- ssize_t r;
- struct sockaddr_in addr;
- socklen_t addrlen;
- struct GNUNET_DNSPARSER_Packet *packet;
- struct GNUNET_NAMESTORE_RecordData rd;
- int found_delegation = GNUNET_NO;
- int found_cname = GNUNET_NO;
- char* delegation_name = NULL;
- int zone_offset = 0;
- int i;
-
- rh->dns_read_task = GNUNET_SCHEDULER_NO_TASK;
- if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY))
- {
- /* timeout or shutdown */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Terminating DNS query %d\n", tc->reason);
- finish_lookup (rh, rlh, 0, NULL);
- return;
- }
-
- addrlen = sizeof (addr);
- r = GNUNET_NETWORK_socket_recvfrom (rh->dns_sock,
- buf, sizeof (buf),
- (struct sockaddr*) &addr,
- &addrlen);
-
- if (-1 == r)
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "recvfrom");
- finish_lookup (rh, rlh, 0, NULL);
- return;
- }
- if (NULL == (packet = GNUNET_DNSPARSER_parse (buf, r)))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Failed to parse DNS reply!\n");
- finish_lookup (rh, rlh, 0, NULL);
- return;
- }
-
- for (i = 0; i < packet->num_answers; i++)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Got record type %d (want %d)\n",
- packet->answers[i].type,
- rlh->record_type);
- /* http://tools.ietf.org/html/rfc1034#section-3.6.2 */
- if (GNUNET_DNSPARSER_TYPE_CNAME == packet->answers[i].type)
- {
- struct GNUNET_DNSPARSER_Query query;
- struct GNUNET_DNSPARSER_Packet npacket;
- struct GNUNET_DNSPARSER_Flags flags;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "CNAME record, restarting query with `%s'\n",
- packet->answers[i].data.hostname);
- strcpy (rh->dns_name,
- packet->answers[i].data.hostname);
- found_cname = GNUNET_YES;
- query.name = rh->dns_name;
- query.type = rlh->record_type;
- query.class = GNUNET_DNSPARSER_CLASS_INTERNET;
- memset (&flags, 0, sizeof (flags));
- flags.recursion_desired = 1;
- flags.checking_disabled = 1;
- npacket.queries = &query;
- npacket.answers = NULL;
- npacket.authority_records = NULL;
- npacket.additional_records = NULL;
- npacket.num_queries = 1;
- npacket.num_answers = 0;
- npacket.num_authority_records = 0;
- npacket.num_additional_records = 0;
- npacket.flags = flags;
- npacket.id = rh->id;
- GNUNET_free_non_null (rh->dns_raw_packet);
- rh->dns_raw_packet = NULL;
- if (GNUNET_OK != GNUNET_DNSPARSER_pack (&npacket,
- UINT16_MAX,
- &rh->dns_raw_packet,
- &rh->dns_raw_packet_size))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_REC_DNS-%llu: Creating raw dns packet!\n",
- rh->id);
- GNUNET_NETWORK_socket_close (rh->dns_sock);
- finish_lookup (rh, rlh, 0, NULL);
- GNUNET_DNSPARSER_free_packet (packet);
- return;
- }
- continue;
- }
-
- if ((packet->answers[i].type == rlh->record_type) &&
- (0 == strcmp (packet->answers[i].name, rh->dns_name)))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Found record!\n");
- rd.data = packet->answers[i].data.raw.data;
- rd.data_size = packet->answers[i].data.raw.data_len;
- rd.record_type = packet->answers[i].type;
- rd.flags = 0;
- rd.expiration_time = packet->answers[i].expiration_time.abs_value_us;
- finish_lookup (rh, rlh, 1, &rd);
- GNUNET_DNSPARSER_free_packet (packet);
- return;
- }
- }
-
- if (GNUNET_YES == found_cname)
- {
- zone_offset = strlen (rh->dns_name) - strlen (rh->dns_zone) - 1;
- if (0 > zone_offset)
- zone_offset = 0;
-
- /* restart query with CNAME */
- if (0 == strcmp (rh->dns_name + zone_offset, rh->dns_zone))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Asking DNS server for `%s'\n",
- rh->dns_name);
-
- send_dns_packet (rh);
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Trying system resolver for `%s'\n", rh->dns_name);
- resolve_dns_name (rh);
- }
-
- GNUNET_DNSPARSER_free_packet (packet);
- return;
- }
-
- for (i = 0; i < packet->num_authority_records; i++)
- {
- if (packet->authority_records[i].type == GNUNET_DNSPARSER_TYPE_NS)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Found NS delegation!\n");
- found_delegation = GNUNET_YES;
- delegation_name = packet->authority_records[i].data.hostname;
- break;
- }
- }
-
- for (i = 0; i < packet->num_additional_records; i++)
- {
- if (GNUNET_NO == found_delegation)
- break;
-
- if ((packet->additional_records[i].type == GNUNET_DNSPARSER_TYPE_A) &&
- (0 == strcmp (packet->additional_records[i].name, delegation_name)))
- {
- GNUNET_assert (sizeof (struct in_addr) ==
- packet->authority_records[i].data.raw.data_len);
-
- rh->dns_addr.sin_addr =
- *((struct in_addr*)packet->authority_records[i].data.raw.data);
- send_dns_packet (rh);
- GNUNET_DNSPARSER_free_packet (packet);
- return;
- }
- }
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Nothing useful in DNS reply!\n");
- finish_lookup (rh, rlh, 0, NULL);
- GNUNET_DNSPARSER_free_packet (packet);
-}
-
-
-/**
- * Sends a UDP dns query to a nameserver specified in the rh
- *
- * @param rh the request handle
- */
-static void
-send_dns_packet (struct ResolverHandle *rh)
-{
- struct GNUNET_NETWORK_FDSet *rset;
-
- rset = GNUNET_NETWORK_fdset_create ();
- GNUNET_NETWORK_fdset_set (rset, rh->dns_sock);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Sending %d byte DNS query\n",
- (int) rh->dns_raw_packet_size);
-
- if (GNUNET_SYSERR ==
- GNUNET_NETWORK_socket_sendto (rh->dns_sock,
- rh->dns_raw_packet,
- rh->dns_raw_packet_size,
- (struct sockaddr*)&rh->dns_addr,
- sizeof (struct sockaddr_in)))
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Failed to send DNS request to %s\n"),
- GNUNET_a2s ((const struct sockaddr *)&rh->dns_addr,
- sizeof (struct sockaddr_in)));
-
- rh->dns_read_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
- rh->timeout, //FIXME less?
- rset,
- NULL,
- &read_dns_response,
- rh);
- GNUNET_NETWORK_fdset_destroy (rset);
-}
-
-
/**
* The final phase of resoution.
* We found a NS RR and want to resolve via DNS
struct RecordLookupHandle *rlh = rh->proc_cls;
struct GNUNET_DNSPARSER_Query query;
struct GNUNET_DNSPARSER_Packet packet;
- struct GNUNET_DNSPARSER_Flags flags;
+ struct GNUNET_TUN_DnsFlags flags;
struct in_addr dnsip;
struct sockaddr_in addr;
struct sockaddr *sa;
}
query.name = rh->dns_name;
query.type = rlh->record_type;
- query.class = GNUNET_DNSPARSER_CLASS_INTERNET;
+ query.class = GNUNET_TUN_DNS_CLASS_INTERNET;
memset (&flags, 0, sizeof (flags));
flags.recursion_desired = 1;
flags.checking_disabled = 1;
{
struct RecordLookupHandle *rlh = rh->proc_cls;
struct GNUNET_HashCode serv_desc;
- struct vpn_data* vpn;
+ struct GNUNET_TUN_GnsVpnRecord* vpn;
int af;
/* We cancel here as to not include the ns lookup in the timeout */
rh->priv_key);
}
- vpn = (struct vpn_data*)rd->data;
+ vpn = (struct GNUNET_TUN_GnsVpnRecord*)rd->data;
GNUNET_CRYPTO_hash ((char*)&vpn[1],
strlen ((char*)&vpn[1]) + 1,
&serv_desc);
}
-/**
- * Handle timeout for DHT requests
- *
- * @param cls the request handle as closure
- * @param tc the task context
- */
-static void
-dht_authority_lookup_timeout (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct ResolverHandle *rh = cls;
- struct RecordLookupHandle *rlh = rh->proc_cls;
- char new_name[GNUNET_DNSPARSER_MAX_NAME_LENGTH];
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_DELEGATE_DHT-%llu: dht lookup for query %s (%s) timed out.\n",
- rh->id, rh->authority_name,
- GNUNET_STRINGS_relative_time_to_string (rh->timeout,
- GNUNET_YES));
-
- rh->status |= RSL_TIMED_OUT;
- rh->timeout_task = GNUNET_SCHEDULER_NO_TASK;
- if (NULL != rh->get_handle)
- {
- GNUNET_DHT_get_stop (rh->get_handle);
- rh->get_handle = NULL;
- }
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_DELEGATE_DHT-%llu: Got shutdown\n",
- rh->id);
- rh->proc (rh->proc_cls, rh, 0, NULL);
- return;
- }
- if (0 == strcmp (rh->name, ""))
- {
- /*
- * promote authority back to name and try to resolve record
- */
- strcpy (rh->name, rh->authority_name);
- rh->proc (rh->proc_cls, rh, 0, NULL);
- return;
- }
-
- /**
- * Start resolution in bg
- */
- GNUNET_snprintf (new_name, GNUNET_DNSPARSER_MAX_NAME_LENGTH,
- "%s.%s.%s",
- rh->name, rh->authority_name, GNUNET_GNS_TLD);
- strcpy (rh->name, new_name);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_DELEGATE_DHT-%llu: Starting background query for %s type %d\n",
- rh->id, rh->name,
- rlh->record_type);
- gns_resolver_lookup_record (rh->authority,
- rh->private_local_zone,
- rlh->record_type,
- new_name,
- NULL,
- GNUNET_TIME_UNIT_FOREVER_REL,
- GNUNET_NO,
- &background_lookup_result_processor,
- NULL);
- rh->proc (rh->proc_cls, rh, 0, NULL);
-}
-
-
-/**
- * Start DHT lookup for a name -> PKEY (compare NS) record in
- * rh->authority's zone
- *
- * @param rh the pending gns query
- */
-static void
-resolve_delegation_dht (struct ResolverHandle *rh);
-
-
-/**
- * Resolve the delegation chain for the request in our namestore
- *
- * @param rh the resolver handle
- */
-static void
-resolve_delegation_ns (struct ResolverHandle *rh);
-
-
-/**
- * Namestore resolution for delegation finished. Processing result.
- *
- * @param cls the closure
- * @param rh resolver handle
- * @param rd_count number of results (always 0)
- * @param rd record data (always NULL)
- */
-static void
-handle_delegation_ns (void* cls, struct ResolverHandle *rh,
- unsigned int rd_count,
- const struct GNUNET_NAMESTORE_RecordData *rd);
-
-
/**
* This is a callback function that checks for key revocation
*
{
GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
"GNS_PHASE_DELEGATE_REV-%llu: Starting background lookup for %s type %d\n",
- rh->id, "+.gads", GNUNET_NAMESTORE_TYPE_REV);
+ rh->id, "+.gnu", GNUNET_NAMESTORE_TYPE_REV);
gns_resolver_lookup_record(rh->authority,
rh->private_local_zone,
}
-/**
- * Callback when record data is put into namestore
- *
- * @param cls the closure
- * @param success GNUNET_OK on success
- * @param emsg the error message. NULL if SUCCESS==GNUNET_OK
- */
-void
-on_namestore_delegation_put_result(void *cls,
- int32_t success,
- const char *emsg)
-{
- struct NamestoreBGTask *nbg = cls;
-
- GNUNET_CONTAINER_heap_remove_node (nbg->node);
- GNUNET_free (nbg);
-
- if (GNUNET_NO == success)
- {
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "GNS_NS: records already in namestore\n");
- return;
- }
- else if (GNUNET_YES == success)
- {
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "GNS_NS: records successfully put in namestore\n");
- return;
- }
-
- GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
- "GNS_NS: Error putting records into namestore: %s\n", emsg);
-}
-
-
/**
* Function called when we get a result from the dht
* for our query. Recursively tries to resolve authorities
/* Check for key revocation and delegate */
- rh->namestore_task = GNUNET_NAMESTORE_lookup_record (namestore_handle,
- &rh->authority,
- GNUNET_GNS_MASTERZONE_STR,
- GNUNET_NAMESTORE_TYPE_REV,
- &process_pkey_revocation_result_ns,
- rh);
+ rh->namestore_task = GNUNET_NAMESTORE_lookup (namestore_handle,
+ &rh->authority,
+ GNUNET_GNS_MASTERZONE_STR,
+ GNUNET_NAMESTORE_TYPE_REV,
+ &process_pkey_revocation_result_ns,
+ rh);
return;
}
char new_mx_data[MAX_MX_LENGTH];
char new_soa_data[MAX_SOA_LENGTH];
char new_srv_data[MAX_SRV_LENGTH];
- struct srv_data *old_srv;
- struct srv_data *new_srv;
- struct soa_data *old_soa;
- struct soa_data *new_soa;
+ struct GNUNET_TUN_DnsSrvRecord *old_srv;
+ struct GNUNET_TUN_DnsSrvRecord *new_srv;
+ struct GNUNET_TUN_DnsSoaRecord *old_soa;
+ struct GNUNET_TUN_DnsSoaRecord *new_soa;
struct GNUNET_NAMESTORE_RecordData p_rd[rd_count];
char* repl_string;
char* pos;
/*
* Prio, weight and port
*/
- new_srv = (struct srv_data*)new_srv_data;
- old_srv = (struct srv_data*)rd[i].data;
+ new_srv = (struct GNUNET_TUN_DnsSrvRecord*)new_srv_data;
+ old_srv = (struct GNUNET_TUN_DnsSrvRecord*)rd[i].data;
new_srv->prio = old_srv->prio;
new_srv->weight = old_srv->weight;
new_srv->port = old_srv->port;
expand_plus((char*)&new_srv[1], (char*)&old_srv[1],
repl_string);
p_rd[i].data = new_srv_data;
- p_rd[i].data_size = sizeof (struct srv_data) + strlen ((char*)&new_srv[1]) + 1;
+ p_rd[i].data_size = sizeof (struct GNUNET_TUN_DnsSrvRecord) + strlen ((char*)&new_srv[1]) + 1;
}
else if (GNUNET_DNSPARSER_TYPE_SOA == rd[i].record_type)
{
/* expand mname and rname */
- old_soa = (struct soa_data*)rd[i].data;
- new_soa = (struct soa_data*)new_soa_data;
- memcpy (new_soa, old_soa, sizeof (struct soa_data));
+ old_soa = (struct GNUNET_TUN_DnsSoaRecord*)rd[i].data;
+ new_soa = (struct GNUNET_TUN_DnsSoaRecord*)new_soa_data;
+ memcpy (new_soa, old_soa, sizeof (struct GNUNET_TUN_DnsSoaRecord));
// FIXME: how do we know that 'new_soa[1]' has enough space for the new name?
expand_plus((char*)&new_soa[1], (char*)&old_soa[1], repl_string);
offset = strlen ((char*)&new_soa[1]) + 1;
expand_plus((char*)&new_soa[1] + offset,
(char*)&old_soa[1] + strlen ((char*)&old_soa[1]) + 1,
repl_string);
- p_rd[i].data_size = sizeof (struct soa_data)
+ p_rd[i].data_size = sizeof (struct GNUNET_TUN_DnsSoaRecord)
+ offset
+ strlen ((char*)&new_soa[1] + offset);
p_rd[i].data = new_soa_data;
}
-/**
- * Checks if "name" ends in ".tld"
- *
- * @param name the name to check
- * @param tld the TLD to check for
- * @return GNUNET_YES or GNUNET_NO
- */
-int
-is_tld (const char* name, const char* tld)
-{
- size_t offset = 0;
-
- if (strlen (name) <= strlen (tld))
- return GNUNET_NO;
- offset = strlen (name) - strlen (tld);
- if (0 != strcmp (name + offset, tld))
- return GNUNET_NO;
- return GNUNET_YES;
-}
-
-
/**
* Namestore resolution for delegation finished. Processing result.
*
memcpy ((void*)rh->rd.data, rd[i].data, rd[i].data_size);
rh->rd_count = 1;
/* Check for key revocation and delegate */
- rh->namestore_task = GNUNET_NAMESTORE_lookup_record (namestore_handle,
- &rh->authority,
- GNUNET_GNS_MASTERZONE_STR,
- GNUNET_NAMESTORE_TYPE_REV,
- &process_pkey_revocation_result_ns,
- rh);
+ rh->namestore_task = GNUNET_NAMESTORE_lookup (namestore_handle,
+ &rh->authority,
+ GNUNET_GNS_MASTERZONE_STR,
+ GNUNET_NAMESTORE_TYPE_REV,
+ &process_pkey_revocation_result_ns,
+ rh);
return;
default:
/* ignore, move to next result */
}
+#endif
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+
/**
- * Resolve the delegation chain for the request in our namestore
- * (as in, find the respective authority for the leftmost label).
+ * Task scheduled to asynchronously fail a resolution.
*
- * @param rh the resolver handle
+ * @param cls the 'struct GNS_ResolverHandle' of the resolution to fail
+ * @param tc task context
*/
static void
-resolve_delegation_ns (struct ResolverHandle *rh)
+fail_resolution (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- pop_tld (rh->name, rh->authority_name);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "GNS_PHASE_DELEGATE_NS-%llu: Finding authority for `%s' by looking up `%s' in GADS zone `%s'\n",
- rh->id,
- rh->name,
- rh->authority_name,
- GNUNET_short_h2s (&rh->authority));
- rh->namestore_task = GNUNET_NAMESTORE_lookup_record (namestore_handle,
- &rh->authority,
- rh->authority_name,
- GNUNET_DNSPARSER_TYPE_ANY,
- &process_delegation_result_ns,
- rh);
+ struct GNS_ResolverHandle *rh = cls;
+
+ rh->task_id = GNUNET_SCHEDULER_NO_TASK;
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
}
/**
- * Lookup of a record in a specific zone
- * calls lookup result processor on result
+ * Get the next, rightmost label from the name that we are trying to resolve,
+ * and update the resolution position accordingly.
*
- * @param zone the root zone
- * @param record_type the record type to look up
- * @param name the name to look up
- * @param shorten_key a private key for use with PSEU import (can be NULL)
- * @param only_cached GNUNET_NO to only check locally not DHT for performance
- * @param proc the processor to call on result
- * @param proc_cls the closure to pass to @a proc
+ * @param rh handle to the resolution operation to get the next label from
+ * @return NULL if there are no more labels
*/
-void
-GNS_resolver_lookup (const struct GNUNET_CRYPTO_EccPublicKey * zone,
- uint32_t record_type,
- const char* name,
- struct GNUNET_CRYPTO_EccPrivateKey *shorten_key,
- int only_cached,
- RecordLookupProcessor proc,
- void *proc_cls)
+static char *
+resolver_lookup_get_next_label (struct GNS_ResolverHandle *rh)
{
- struct ResolverHandle *rh;
- struct RecordLookupHandle* rlh;
- char string_hash[GNUNET_DNSPARSER_MAX_LABEL_LENGTH];
- char nzkey[GNUNET_DNSPARSER_MAX_LABEL_LENGTH];
- char* nzkey_ptr = nzkey;
+ const char *rp;
+ const char *dot;
+ size_t len;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Starting resolution for `%s' (type=%d) with timeout %s!\n",
- name, record_type,
- GNUNET_STRINGS_relative_time_to_string (timeout, GNUNET_YES));
+ if (0 == rh->name_resolution_pos)
+ return NULL;
+ dot = memrchr (rh->name, (int) '.', rh->name_resolution_pos);
+ if (NULL == dot)
+ {
+ /* done, this was the last one */
+ len = rh->name_resolution_pos;
+ rp = rh->name;
+ rh->name_resolution_pos = 0;
+ }
+ else
+ {
+ /* advance by one label */
+ len = rh->name_resolution_pos - (dot - rh->name) - 1;
+ rp = dot + 1;
+ rh->name_resolution_pos = dot - rh->name;
+ }
+ return GNUNET_strndup (rp, len);
+}
+
+
+/**
+ * Gives the cummulative result obtained to the callback and clean up the request.
+ *
+ * @param rh resolution process that has culminated in a result
+ */
+static void
+transmit_lookup_dns_result (struct GNS_ResolverHandle *rh)
+{
+ struct DnsResult *pos;
+ unsigned int n;
+ unsigned int i;
- if ((is_canonical ((char*)name) == GNUNET_YES) &&
- (strcmp(GNUNET_GNS_TLD, name) != 0))
+ n = 0;
+ for (pos = rh->dns_result_head; NULL != pos; pos = pos->next)
+ n++;
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "%s is canonical and not gnunet -> cannot resolve!\n", name);
- proc(cls, 0, NULL);
+ struct GNUNET_NAMESTORE_RecordData rd[n];
+
+ i = 0;
+ for (pos = rh->dns_result_head; NULL != pos; pos = pos->next)
+ {
+ rd[i].data = pos->data;
+ rd[i].data_size = pos->data_size;
+ rd[i].record_type = pos->record_type;
+ if (0 == pos->expiration_time)
+ {
+ rd[i].flags = GNUNET_NAMESTORE_RF_RELATIVE_EXPIRATION;
+ rd[i].expiration_time = 0;
+ }
+ else
+ {
+ rd[i].flags = GNUNET_NAMESTORE_RF_NONE;
+ rd[i].expiration_time = pos->expiration_time;
+ }
+ }
+ rh->proc (rh->proc_cls,
+ n,
+ rd);
+ }
+ GNS_resolver_lookup_cancel (rh);
+}
+
+
+/**
+ * Add a result from DNS to the records to be returned to the application.
+ *
+ * @param rh resolution request to extend with a result
+ * @param expiration_time expiration time for the answer
+ * @param record_type DNS record type of the answer
+ * @param data_size number of bytes in @a data
+ * @param data binary data to return in DNS record
+ */
+static void
+add_dns_result (struct GNS_ResolverHandle *rh,
+ uint64_t expiration_time,
+ uint32_t record_type,
+ size_t data_size,
+ const void *data)
+{
+ struct DnsResult *res;
+
+ res = GNUNET_malloc (sizeof (struct DnsResult) + data_size);
+ res->expiration_time = expiration_time;
+ res->data_size = data_size;
+ res->record_type = record_type;
+ res->data = &res[1];
+ memcpy (&res[1], data, data_size);
+ GNUNET_CONTAINER_DLL_insert (rh->dns_result_head,
+ rh->dns_result_tail,
+ res);
+}
+
+
+/**
+ * We had to do a DNS lookup. Convert the result (if any) and return
+ * it.
+ *
+ * @param cls closure with the 'struct GNS_ResolverHandle'
+ * @param addr one of the addresses of the host, NULL for the last address
+ * @param addrlen length of the address
+ */
+static void
+handle_dns_result (void *cls,
+ const struct sockaddr *addr,
+ socklen_t addrlen)
+{
+ struct GNS_ResolverHandle *rh = cls;
+ const struct sockaddr_in *sa4;
+ const struct sockaddr_in6 *sa6;
+
+ rh->std_resolve = NULL;
+ if (NULL == addr)
+ {
+ transmit_lookup_dns_result (rh);
return;
}
-
- rlh = GNUNET_malloc (sizeof(struct RecordLookupHandle));
- rh = GNUNET_malloc (sizeof (struct ResolverHandle));
- rh->authority = zone;
- rh->id = rid_gen++;
- rh->proc_cls = rlh;
- rh->priv_key = key;
- rh->timeout = timeout;
- rh->private_local_zone = pzone;
- rh->only_cached = only_cached;
+ switch (addr->sa_family)
+ {
+ case AF_INET:
+ sa4 = (const struct sockaddr_in *) addr;
+ add_dns_result (rh,
+ 0 /* expiration time is unknown */,
+ GNUNET_DNSPARSER_TYPE_A,
+ sizeof (struct in_addr),
+ &sa4->sin_addr);
+ break;
+ case AF_INET6:
+ sa6 = (const struct sockaddr_in6 *) addr;
+ add_dns_result (rh,
+ 0 /* expiration time is unknown */,
+ GNUNET_DNSPARSER_TYPE_AAAA,
+ sizeof (struct in6_addr),
+ &sa6->sin6_addr);
+ break;
+ default:
+ GNUNET_break (0);
+ break;
+ }
+}
- GNUNET_CONTAINER_DLL_insert (rlh_head, rlh_tail, rh);
-
- if (NULL == key)
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "No shorten key for resolution\n");
- if (timeout.rel_value_us != GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us)
+/**
+ * Task scheduled to continue with the resolution process.
+ *
+ * @param cls the 'struct GNS_ResolverHandle' of the resolution
+ * @param tc task context
+ */
+static void
+recursive_resolution (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc);
+
+
+/**
+ * Function called with the result of a DNS resolution.
+ *
+ * @param cls the request handle of the resolution that
+ * we were attempting to make
+ * @param rs socket that received the response
+ * @param dns dns response, never NULL
+ * @param dns_len number of bytes in 'dns'
+ */
+static void
+dns_result_parser (void *cls,
+ struct GNUNET_DNSSTUB_RequestSocket *rs,
+ const struct GNUNET_TUN_DnsHeader *dns,
+ size_t dns_len)
+{
+ struct GNS_ResolverHandle *rh = cls;
+ struct GNUNET_DNSPARSER_Packet *p;
+
+ rh->dns_request = NULL;
+ GNUNET_SCHEDULER_cancel (rh->task_id);
+ rh->task_id = GNUNET_SCHEDULER_NO_TASK;
+ p = GNUNET_DNSPARSER_parse ((const char *) dns,
+ dns_len);
+ if (NULL == p)
{
- /*
- * Set timeout for authority lookup phase to 1/2
- */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Timeout for lookup set to %s/2\n",
- GNUNET_STRINGS_relative_time_to_string (rh->timeout, GNUNET_YES));
- rh->timeout_task = GNUNET_SCHEDULER_add_delayed (
- GNUNET_TIME_relative_divide(timeout, 2),
- &handle_lookup_timeout,
- rh);
- rh->timeout_cont = &dht_authority_lookup_timeout;
- rh->timeout_cont_cls = rh;
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Failed to parse DNS response\n"));
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
+ return;
+ }
+ // FIXME:
+ // Check if the packet is the final answer, or
+ // just pointing us to another NS or another name (CNAME), or another domain (DNAME);
+ // then do the right thing (TM) -- possibly using "recursive_dns_resolution".
+ GNUNET_break (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("NOT IMPLEMENTED\n"));
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
+
+
+ GNUNET_DNSPARSER_free_packet (p);
+}
+
+
+/**
+ * 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.
+ *
+ * @param rh resolution information
+ */
+static void
+recursive_dns_resolution (struct GNS_ResolverHandle *rh)
+{
+ struct AuthorityChain *ac;
+ socklen_t sa_len;
+ struct GNUNET_DNSPARSER_Query *query;
+ struct GNUNET_DNSPARSER_Packet *p;
+ char *dns_request;
+ size_t dns_request_length;
+
+ ac = rh->ac_tail;
+ GNUNET_assert (NULL != ac);
+ GNUNET_assert (GNUNET_NO == ac->gns_authority);
+ switch (((const struct sockaddr *) &ac->authority_info.dns_authority.dns_ip)->sa_family)
+ {
+ case AF_INET:
+ sa_len = sizeof (struct sockaddr_in);
+ break;
+ case AF_INET6:
+ sa_len = sizeof (struct sockaddr_in6);
+ break;
+ default:
+ GNUNET_break (0);
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
+ return;
+ }
+ query = GNUNET_new (struct GNUNET_DNSPARSER_Query);
+ query->name = GNUNET_strdup (ac->label);
+ query->type = rh->record_type;
+ query->class = GNUNET_TUN_DNS_CLASS_INTERNET;
+ p = GNUNET_new (struct GNUNET_DNSPARSER_Packet);
+ p->queries = query;
+ p->num_queries = 1;
+ p->id = (uint16_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
+ UINT16_MAX);
+ p->flags.opcode = GNUNET_TUN_DNS_OPCODE_QUERY;
+ p->flags.recursion_desired = 1;
+ if (GNUNET_OK !=
+ GNUNET_DNSPARSER_pack (p, 1024, &dns_request, &dns_request_length))
+ {
+ GNUNET_break (0);
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
}
else
{
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "No timeout for query!\n");
- rh->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ rh->dns_request = GNUNET_DNSSTUB_resolve (dns_handle,
+ (const struct sockaddr *) &ac->authority_info.dns_authority.dns_ip,
+ sa_len,
+ dns_request,
+ dns_request_length,
+ &dns_result_parser,
+ rh);
+ rh->task_id = GNUNET_SCHEDULER_add_delayed (DNS_LOOKUP_TIMEOUT,
+ &fail_resolution,
+ rh);
}
+ GNUNET_free (dns_request);
+ GNUNET_DNSPARSER_free_packet (p);
+}
+
+
+/**
+ * Process a records that were decrypted from a block.
+ *
+ * @param cls closure with the 'struct GNS_ResolverHandle'
+ * @param rd_count number of entries in @a rd array
+ * @param rd array of records with data to store
+ */
+static void
+handle_gns_resolution_result (void *cls,
+ unsigned int rd_count,
+ const struct GNUNET_NAMESTORE_RecordData *rd)
+{
+ struct GNS_ResolverHandle *rh = cls;
+
+ // FIXME: not implemented
+ // if this was the last label, return 'rd' to application
+ // (possibly first checking about converting records
+ // to requested type, if possible).
+ // if not, look for PKEY, CNAME, DNAME or NS to extend
+ // auth chain and continue with recursion
+ GNUNET_break (0);
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
+}
+
+
+/**
+ * Function called once the namestore has completed the request for
+ * caching a block.
+ *
+ * @param cls closure with the 'struct GNS_ResolverHandle'
+ * @param success #GNUNET_OK on success
+ * @param emsg error message
+ */
+static void
+namestore_cache_continuation (void *cls,
+ int32_t success,
+ const char *emsg)
+{
+ struct GNS_ResolverHandle *rh = cls;
+
+ rh->namestore_qe = NULL;
+ if (NULL != emsg)
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Failed to cache GNS resolution: %s\n"),
+ emsg);
+}
+
+
+/**
+ * Iterator called on each result obtained for a DHT
+ * operation that expects a reply
+ *
+ * @param cls closure with the 'struct GNS_ResolverHandle'
+ * @param exp when will this value expire
+ * @param key key of the result
+ * @param get_path peers on reply path (or NULL if not recorded)
+ * [0] = datastore's first neighbor, [length - 1] = local peer
+ * @param get_path_length number of entries in get_path
+ * @param put_path peers on the PUT path (or NULL if not recorded)
+ * [0] = origin, [length - 1] = datastore
+ * @param put_path_length number of entries in get_path
+ * @param type type of the result
+ * @param size number of bytes in data
+ * @param data pointer to the result data
+ */
+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)
+{
+ struct GNS_ResolverHandle *rh = cls;
+ struct AuthorityChain *ac = rh->ac_tail;
+ const struct GNUNET_NAMESTORE_Block *block;
- if (strcmp(GNUNET_GNS_TLD, name) == 0)
+ GNUNET_DHT_get_stop (rh->get_handle);
+ rh->get_handle = NULL;
+ GNUNET_CONTAINER_heap_remove_node (rh->dht_heap_node);
+ rh->dht_heap_node = NULL;
+ if (size < sizeof (struct GNUNET_NAMESTORE_Block))
+ {
+ /* how did this pass DHT block validation!? */
+ GNUNET_break (0);
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
+ return;
+ }
+ block = data;
+ if (size !=
+ ntohs (block->purpose.size) +
+ sizeof (struct GNUNET_CRYPTO_EccPublicKey) +
+ sizeof (struct GNUNET_CRYPTO_EccSignature))
+ {
+ /* how did this pass DHT block validation!? */
+ GNUNET_break (0);
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
+ return;
+ }
+ if (GNUNET_OK !=
+ GNUNET_NAMESTORE_block_decrypt (block,
+ &ac->authority_info.gns_authority,
+ ac->label,
+ &handle_gns_resolution_result,
+ rh))
+ {
+ GNUNET_break_op (0); /* block was ill-formed */
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
+ return;
+ }
+ /* Cache well-formed blocks */
+ rh->namestore_qe = GNUNET_NAMESTORE_block_cache (namestore_handle,
+ block,
+ &namestore_cache_continuation,
+ rh);
+}
+
+
+/**
+ * Process a record that was stored in the namestore.
+ *
+ * @param cls closure with the 'struct GNS_ResolverHandle'
+ * @param block block that was stored in the namestore
+ */
+static void
+handle_namestore_block_response (void *cls,
+ const struct GNUNET_NAMESTORE_Block *block)
+{
+ struct GNS_ResolverHandle *rh = cls;
+ struct GNS_ResolverHandle *rx;
+ struct AuthorityChain *ac = rh->ac_tail;
+ const char *label = ac->label;
+ const struct GNUNET_CRYPTO_EccPublicKey *auth = &ac->authority_info.gns_authority;
+ struct GNUNET_HashCode query;
+
+ GNUNET_NAMESTORE_query_from_public_key (auth,
+ label,
+ &query);
+ rh->namestore_qe = NULL;
+ if (NULL == block)
+ {
+ /* Namestore knows nothing; try DHT lookup */
+ rh->get_handle = GNUNET_DHT_get_start (dht_handle,
+ GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
+ &query,
+ DHT_GNS_REPLICATION_LEVEL,
+ GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
+ NULL, 0,
+ &handle_dht_response, rh);
+ rh->dht_heap_node = GNUNET_CONTAINER_heap_insert (dht_lookup_heap,
+ rh,
+ GNUNET_TIME_absolute_get ().abs_value_us);
+ if (GNUNET_CONTAINER_heap_get_size (dht_lookup_heap) > max_allowed_background_queries)
+ {
+ /* fail longest-standing DHT request */
+ rx = GNUNET_CONTAINER_heap_peek (dht_lookup_heap);
+ rx->proc (rx->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rx);
+ }
+ return;
+ }
+ if (GNUNET_OK !=
+ GNUNET_NAMESTORE_block_decrypt (block,
+ auth,
+ label,
+ &handle_gns_resolution_result,
+ rh))
{
- /**
- * Only '.gads' given
- */
- strcpy (rh->name, "\0");
+ GNUNET_break_op (0); /* block was ill-formed */
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
+ return;
}
- else
+}
+
+
+/**
+ * Lookup tail of our authority chain in the namestore.
+ *
+ * @param rh query we are processing
+ */
+static void
+recursive_gns_resolution_namestore (struct GNS_ResolverHandle *rh)
+{
+ struct AuthorityChain *ac = rh->ac_tail;
+ struct GNUNET_HashCode query;
+
+ GNUNET_NAMESTORE_query_from_public_key (&ac->authority_info.gns_authority,
+ ac->label,
+ &query);
+ rh->namestore_qe = GNUNET_NAMESTORE_lookup_block (namestore_handle,
+ &query,
+ &handle_namestore_block_response,
+ rh);
+}
+
+
+/**
+ * Task scheduled to continue with the resolution process.
+ *
+ * @param cls the 'struct GNS_ResolverHandle' of the resolution
+ * @param tc task context
+ */
+static void
+recursive_resolution (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNS_ResolverHandle *rh = cls;
+
+ rh->task_id = GNUNET_SCHEDULER_NO_TASK;
+ if (MAX_RECURSION < rh->loop_limiter++)
{
- if (is_zkey_tld(name) == GNUNET_YES)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "TLD is zkey\n");
- /**
- * This is a zkey tld
- * build hash and use as initial authority
- */
- memset(rh->name, 0,
- strlen(name)-strlen(GNUNET_GNS_TLD_ZKEY));
- memcpy(rh->name, name,
- strlen(name)-strlen(GNUNET_GNS_TLD_ZKEY) - 1);
- pop_tld (rh->name, string_hash);
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Encountered unbounded recursion resolving `%s'\n",
+ rh->name);
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
+ return;
+ }
+ if (GNUNET_YES == rh->ac_tail->gns_authority)
+ recursive_gns_resolution_namestore (rh);
+ else
+ recursive_dns_resolution (rh);
+}
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "ZKEY is %s!\n", string_hash);
-
- GNUNET_STRINGS_utf8_toupper(string_hash, &nzkey_ptr);
- if (GNUNET_OK != GNUNET_CRYPTO_short_hash_from_string(nzkey,
- &rh->authority))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Cannot convert ZKEY `%s' to hash!\n", string_hash);
-
- if (GNUNET_SCHEDULER_NO_TASK != rh->timeout_task)
- GNUNET_SCHEDULER_cancel (rh->timeout_task);
- GNUNET_CONTAINER_DLL_remove (rlh_head, rlh_tail, rh);
- GNUNET_free (rh);
- GNUNET_free (rlh);
- proc (cls, 0, NULL);
- return;
- }
+/**
+ * Lookup of a record in a specific zone calls lookup result processor
+ * on result.
+ *
+ * @param zone the zone to perform the lookup in
+ * @param record_type the record type to look up
+ * @param name the name to look up
+ * @param shorten_key a private key for use with PSEU import (can be NULL)
+ * @param only_cached GNUNET_NO to only check locally not DHT for performance
+ * @param proc the processor to call on result
+ * @param proc_cls the closure to pass to @a proc
+ * @return handle to cancel operation
+ */
+struct GNS_ResolverHandle *
+GNS_resolver_lookup (const struct GNUNET_CRYPTO_EccPublicKey *zone,
+ uint32_t record_type,
+ const char *name,
+ const struct GNUNET_CRYPTO_EccPrivateKey *shorten_key,
+ int only_cached,
+ GNS_ResultProcessor proc, void *proc_cls)
+{
+ struct GNS_ResolverHandle *rh;
+ struct AuthorityChain *ac;
+ char *x;
+ char *y;
+ char *pkey;
+
+ rh = GNUNET_new (struct GNS_ResolverHandle);
+ GNUNET_CONTAINER_DLL_insert (rlh_head,
+ rlh_tail,
+ rh);
+ rh->authority_zone = *zone;
+ rh->proc = proc;
+ rh->proc_cls = proc_cls;
+ rh->only_cached = only_cached;
+ rh->record_type = record_type;
+ rh->name = GNUNET_strdup (name);
+ rh->name_resolution_pos = strlen (name);
+ if (NULL != shorten_key)
+ {
+ rh->shorten_key = GNUNET_new (struct GNUNET_CRYPTO_EccPrivateKey);
+ *rh->shorten_key = *shorten_key;
+ }
- }
- else if (is_gads_tld (name) == GNUNET_YES)
+ if ( ( (GNUNET_YES == is_canonical (name)) &&
+ (0 != strcmp (GNUNET_GNS_TLD, name)) ) ||
+ ( (GNUNET_YES != is_gnu_tld (name)) &&
+ (GNUNET_YES != is_zkey_tld (name)) ) )
+ {
+ /* use standard DNS lookup */
+ int af;
+
+ switch (record_type)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "TLD is gads\n");
- /**
- * Presumably GADS tld
- */
- memcpy (rh->name, name,
- strlen (name) - strlen(GNUNET_GNS_TLD) - 1);
- rh->name[strlen (name) - strlen(GNUNET_GNS_TLD) - 1] = '\0';
+ case GNUNET_DNSPARSER_TYPE_A:
+ af = AF_INET;
+ break;
+ case GNUNET_DNSPARSER_TYPE_AAAA:
+ af = AF_INET6;
+ break;
+ default:
+ af = AF_UNSPEC;
+ break;
}
- else
+ rh->std_resolve = GNUNET_RESOLVER_ip_get (name,
+ af,
+ DNS_LOOKUP_TIMEOUT,
+ &handle_dns_result,
+ rh);
+ return rh;
+ }
+ if (is_zkey_tld (name))
+ {
+ /* Name ends with ".zkey", try to replace authority zone with zkey
+ authority */
+ GNUNET_free (resolver_lookup_get_next_label (rh)); /* will return "zkey" */
+ x = resolver_lookup_get_next_label (rh); /* will return 'x' coordinate */
+ y = resolver_lookup_get_next_label (rh); /* will return 'y' coordinate */
+ GNUNET_asprintf (&pkey,
+ "%s%s",
+ x, y);
+ if ( (NULL == x) ||
+ (NULL == y) ||
+ (GNUNET_OK !=
+ GNUNET_CRYPTO_ecc_public_key_from_string (pkey,
+ strlen (pkey),
+ &rh->authority_zone)) )
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("Not a GADS TLD: `%s'\n"),
- name);
- if (GNUNET_SCHEDULER_NO_TASK != rh->timeout_task)
- GNUNET_SCHEDULER_cancel (rh->timeout_task);
- GNUNET_CONTAINER_DLL_remove (rlh_head, rlh_tail, rh);
- GNUNET_free (rh);
- GNUNET_free (rlh);
- proc (cls, 0, NULL);
- return;
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Hostname `%s' is not well-formed, resolution fails\n"),
+ name);
+ rh->task_id = GNUNET_SCHEDULER_add_now (&fail_resolution, rh);
}
+ GNUNET_free_non_null (x);
+ GNUNET_free_non_null (y);
+ GNUNET_free (pkey);
}
-
- /**
- * Initialize authority chain
- */
- rh->authority_chain_head = GNUNET_malloc (sizeof(struct AuthorityChain));
- rh->authority_chain_tail = rh->authority_chain_head;
- rh->authority_chain_head->zone = rh->authority;
- strcpy (rh->authority_chain_head->name, "");
-
- /**
- * Copy original query into lookup handle
- */
- rlh->record_type = record_type;
- memset(rlh->name, 0, strlen(name) + 1);
- strcpy(rlh->name, name);
- rlh->proc = proc;
- rlh->proc_cls = cls;
-
- rh->proc = &handle_delegation_ns;
- resolve_delegation_ns (rh);
+ else
+ {
+ /* Name ends with ".gnu", eat ".gnu" and continue with resolution */
+ GNUNET_free (resolver_lookup_get_next_label (rh));
+ }
+ ac = GNUNET_new (struct AuthorityChain);
+ ac->rh = rh;
+ ac->label = resolver_lookup_get_next_label (rh);
+ if (NULL == ac->label)
+ /* name was just "gnu", so we default to label '+' */
+ ac->label = GNUNET_strdup (GNUNET_GNS_MASTERZONE_STR);
+ ac->gns_authority = GNUNET_YES;
+ ac->authority_info.gns_authority = rh->authority_zone;
+ GNUNET_CONTAINER_DLL_insert_tail (rh->ac_head,
+ rh->ac_tail,
+ ac);
+ rh->task_id = GNUNET_SCHEDULER_add_now (&recursive_resolution,
+ rh);
+ return rh;
}
+/**
+ * Cancel active resolution (i.e. client disconnected).
+ *
+ * @param rh resolution to abort
+ */
+void
+GNS_resolver_lookup_cancel (struct GNS_ResolverHandle *rh)
+{
+ struct DnsResult *dr;
+ struct AuthorityChain *ac;
+
+ GNUNET_CONTAINER_DLL_remove (rlh_head,
+ rlh_tail,
+ rh);
+ while (NULL != (ac = rh->ac_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (rh->ac_head,
+ rh->ac_tail,
+ ac);
+ GNUNET_free (ac->label);
+ GNUNET_free (ac);
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != rh->task_id)
+ {
+ GNUNET_SCHEDULER_cancel (rh->task_id);
+ rh->task_id = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (NULL != rh->get_handle)
+ {
+ GNUNET_DHT_get_stop (rh->get_handle);
+ rh->get_handle = NULL;
+ }
+ if (NULL != rh->dht_heap_node)
+ {
+ GNUNET_CONTAINER_heap_remove_node (rh->dht_heap_node);
+ rh->dht_heap_node = NULL;
+ }
+ if (NULL != rh->dns_request)
+ {
+ GNUNET_DNSSTUB_resolve_cancel (rh->dns_request);
+ rh->dns_request = NULL;
+ }
+ if (NULL != rh->namestore_qe)
+ {
+ GNUNET_NAMESTORE_cancel (rh->namestore_qe);
+ rh->namestore_qe = NULL;
+ }
+ if (NULL != rh->std_resolve)
+ {
+ GNUNET_RESOLVER_request_cancel (rh->std_resolve);
+ rh->std_resolve = NULL;
+ }
+ while (NULL != (dr = rh->dns_result_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (rh->dns_result_head,
+ rh->dns_result_tail,
+ dr);
+ GNUNET_free (dr);
+ }
+ GNUNET_free_non_null (rh->shorten_key);
+ GNUNET_free (rh->name);
+ GNUNET_free (rh);
+}
+
+
+/* ***************** Resolver initialization ********************* */
+
+
+/**
+ * Initialize the resolver
+ *
+ * @param nh the namestore handle
+ * @param dht the dht handle
+ * @param c configuration handle
+ * @param max_bg_queries maximum number of parallel background queries in dht
+ */
+void
+GNS_resolver_init (struct GNUNET_NAMESTORE_Handle *nh,
+ struct GNUNET_DHT_Handle *dht,
+ const struct GNUNET_CONFIGURATION_Handle *c,
+ unsigned long long max_bg_queries)
+{
+ char *dns_ip;
+
+ cfg = c;
+ namestore_handle = nh;
+ dht_handle = dht;
+ dht_lookup_heap =
+ GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
+ max_allowed_background_queries = max_bg_queries;
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_string (c,
+ "gns",
+ "DNS_RESOLVER",
+ &dns_ip))
+ {
+ /* user did not specify DNS resolver, use 8.8.8.8 */
+ dns_ip = GNUNET_strdup ("8.8.8.8");
+ }
+ dns_handle = GNUNET_DNSSTUB_start (dns_ip);
+ GNUNET_free (dns_ip);
+}
+
+
+/**
+ * Shutdown resolver
+ */
+void
+GNS_resolver_done ()
+{
+ struct GNS_ResolverHandle *rh;
+
+ /* abort active resolutions */
+ while (NULL != (rh = rlh_head))
+ {
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
+ }
+ /* abort active shorten operations */
+ while (NULL != gph_head)
+ free_get_pseu_authority_handle (gph_head);
+ GNUNET_CONTAINER_heap_destroy (dht_lookup_heap);
+ dht_lookup_heap = NULL;
+ GNUNET_DNSSTUB_stop (dns_handle);
+ dns_handle = NULL;
+}
+
+
+/* *************** common helper functions (do not really belong here) *********** */
+
+/**
+ * Checks if "name" ends in ".tld"
+ *
+ * @param name the name to check
+ * @param tld the TLD to check for
+ * @return GNUNET_YES or GNUNET_NO
+ */
+int
+is_tld (const char* name, const char* tld)
+{
+ size_t offset = 0;
+
+ if (strlen (name) <= strlen (tld))
+ return GNUNET_NO;
+ offset = strlen (name) - strlen (tld);
+ if (0 != strcmp (name + offset, tld))
+ return GNUNET_NO;
+ return GNUNET_YES;
+}
+
+
+
+
/* end of gnunet-service-gns_resolver.c */
projects / oweals / gnunet.git / blobdiff