2 This file is part of GNUnet.
3 (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file gns/gnunet-service-gns.c
23 * @brief GNUnet GNS service
24 * @author Martin Schanzenbach
27 #include "gnunet_util_lib.h"
28 #include "gnunet_transport_service.h"
29 #include "gnunet_dns_service.h"
30 #include "gnunet_dnsparser_lib.h"
31 #include "gnunet_namestore_service.h"
32 #include "gnunet_gns_service.h"
36 /* TODO into gnunet_protocols */
37 #define GNUNET_MESSAGE_TYPE_GNS_CLIENT_LOOKUP 23
38 #define GNUNET_MESSAGE_TYPE_GNS_CLIENT_RESULT 24
41 * A result list for namestore queries
43 struct GNUNET_GNS_PendingQuery
45 /* the answer packet */
46 struct GNUNET_DNSPARSER_Packet *answer;
48 /* records to put into answer packet */
49 struct GNUNET_CONTAINER_SList *records;
52 int num_authority_records; //FIXME are all of our replies auth?
54 /* the dns request id */
55 int id; // FIXME can handle->request_id also be used here?
57 /* the request handle to reply to */
58 struct GNUNET_DNS_RequestHandle *request_handle;
63 * Our handle to the DNS handler library
65 struct GNUNET_DNS_Handle *dns_handle;
68 * Our handle to the namestore service
70 struct GNUNET_NAMESTORE_Handle *namestore_handle;
73 * The configuration the GNS service is running with
75 const struct GNUNET_CONFIGURATION_Handle *GNS_cfg;
78 * Our notification context.
80 static struct GNUNET_SERVER_NotificationContext *nc;
85 const GNUNET_HashCode *my_zone;
88 * Task run during shutdown.
94 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
96 GNUNET_DNS_disconnect(dns_handle);
100 process_ns_result(void* cls, const GNUNET_HashCode *zone,
101 const char *name, uint32_t record_type,
102 struct GNUNET_TIME_Absolute expiration,
103 enum GNUNET_NAMESTORE_RecordFlags flags,
104 const struct GNUNET_NAMESTORE_SignatureLocation *sig_loc,
105 size_t size, const void *data)
107 struct GNUNET_GNS_PendingQuery *answer;
108 struct GNUNET_DNSPARSER_Record *record;
109 struct GNUNET_DNSPARSER_Packet *packet;
110 struct GNUNET_DNSPARSER_Flags dnsflags;
113 answer = (struct GNUNET_GNS_PendingQuery *) cls;
119 * Last result received (or none)
120 * FIXME extract to func
122 reply_buffer = GNUNET_malloc(6000); //FIXME magic number
123 packet = GNUNET_malloc(sizeof(struct GNUNET_DNSPARSER_Packet));
125 GNUNET_malloc(sizeof(struct GNUNET_DNSPARSER_Record) * answer->num_records);
126 /* FIXME how to handle auth, additional etc */
127 packet->num_answers = answer->num_records;
128 packet->num_authority_records = answer->num_authority_records;
130 dnsflags.authoritative_answer = 1;
131 dnsflags.return_code = GNUNET_DNSPARSER_RETURN_CODE_YXDOMAIN; //not sure
132 dnsflags.query_or_response = 1;
133 packet->flags = dnsflags;
135 packet->id = answer->id;
136 size_t bufsize = 6000;
137 int ret = GNUNET_DNSPARSER_pack (packet,
138 600, /* FIXME max udp payload */
140 &bufsize); // FIXME magic number bufsize
141 if (ret == GNUNET_OK)
143 GNUNET_DNS_request_answer(answer->request_handle,
144 6000, //FIXME what length here
157 record = GNUNET_malloc(sizeof(struct GNUNET_DNSPARSER_Record));
158 record->name = (char*)name;
159 /* FIXME for gns records this requires the dnsparser to be modified!*/
160 //record->data = data; FIXME!
161 record->expiration_time = expiration;
162 record->type = record_type;
163 record->class = GNUNET_DNSPARSER_CLASS_INTERNET; /* srsly? */
165 if (flags == GNUNET_NAMESTORE_RF_AUTHORITY)
167 answer->num_authority_records++;
170 answer->num_records++;
172 //FIXME watch for leaks
173 GNUNET_CONTAINER_slist_add (answer->records,
174 GNUNET_CONTAINER_SLIST_DISPOSITION_DYNAMIC,
175 &record, sizeof(struct GNUNET_DNSPARSER_Record*));
181 * The DNS request handler
182 * Is this supposed to happen here in the service (config option)
183 * or in an app that interfaces with the GNS API?
186 * @param rh request handle to user for reply
187 * @param request_length number of bytes in request
188 * @param request udp payload of the DNS request
191 handle_dns_request(void *cls,
192 struct GNUNET_DNS_RequestHandle *rh,
193 size_t request_length,
197 * parse request for tld
199 struct GNUNET_DNSPARSER_Packet *p;
200 struct GNUNET_GNS_PendingQuery *answer;
205 p = GNUNET_DNSPARSER_parse (request, request_length);
208 fprintf (stderr, "Received malformed DNS packet, leaving it untouched\n");
209 GNUNET_DNS_request_forward (rh);
214 * Check tld and decide if we or
215 * legacy dns is responsible
217 for (i=0;i<p->num_queries;i++)
219 namelen = strlen(p->queries[i].name);
221 if (namelen < 7) /* this can't be .gnunet */
225 * Move our tld/root to config file
226 * Generate fake DNS reply that replaces .gnunet with .org for testing?
228 tail = p->queries[i].name+(namelen-7);
229 if (0 == strcmp(tail, ".gnunet"))
232 * Do db lookup here. Make dht lookup if necessary
233 * FIXME for now only local lookups for our zone!
235 answer = GNUNET_malloc(sizeof (struct GNUNET_GNS_PendingQuery));
236 answer->records = GNUNET_CONTAINER_slist_create ();
239 GNUNET_NAMESTORE_lookup_name(namestore_handle,
245 //GNUNET_DNS_request_answer(rh, 0 /*length*/, NULL/*reply*/);
249 GNUNET_DNS_request_forward (rh);
256 handle_client_record_lookup(void *cls,
257 struct GNUNET_SERVER_Client *client,
258 const struct GNUNET_MessageHeader *message)
263 * Process GNS requests.
266 * @param server the initialized server
267 * @param c configuration to use
270 run (void *cls, struct GNUNET_SERVER_Handle *server,
271 const struct GNUNET_CONFIGURATION_Handle *c)
273 /* The IPC message types */
274 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
275 /* callback, cls, type, size */
276 {&handle_client_record_lookup, NULL, GNUNET_MESSAGE_TYPE_GNS_CLIENT_LOOKUP,
281 nc = GNUNET_SERVER_notification_context_create (server, 1);
283 /* FIXME - do some config parsing
284 * - Maybe only hijack dns if option is set (HIJACK_DNS=1)
287 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
290 * Do gnunet dns init here
292 dns_handle = GNUNET_DNS_connect(c,
293 GNUNET_DNS_FLAG_PRE_RESOLUTION,
294 &handle_dns_request, /* rh */
298 * handle to our local namestore
300 namestore_handle = GNUNET_NAMESTORE_connect(c);
302 GNUNET_SERVER_add_handlers (server, handlers);
304 * Esp the lookup would require to keep track of the clients' context
306 * GNUNET_SERVER_disconnect_notify (server, &client_disconnect, NULL);
312 * The main function for the GNS service.
314 * @param argc number of arguments from the command line
315 * @param argv command line arguments
316 * @return 0 ok, 1 on error
319 main (int argc, char *const *argv)
325 GNUNET_SERVICE_run (argc, argv, "gns", GNUNET_SERVICE_OPTION_NONE, &run,
330 /* end of gnunet-service-gns.c */