2 This file is part of GNUnet.
3 (C) 2009 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
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
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.
15 You should have received a copy of the GNU General Public License
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 vpn/gnunet-service-dns.c
23 * @author Philipp Toelke
26 #include "gnunet_getopt_lib.h"
27 #include "gnunet_service_lib.h"
28 #include "gnunet_network_lib.h"
29 #include "gnunet_os_lib.h"
30 #include "gnunet-service-dns-p.h"
31 #include "gnunet_protocols.h"
32 #include "gnunet-vpn-packet.h"
33 #include "gnunet-vpn-pretty-print.h"
34 #include "gnunet_container_lib.h"
35 #include "gnunet-dns-parser.h"
36 #include "gnunet_dht_service.h"
37 #include "gnunet_block_lib.h"
38 #include "block_dns.h"
39 #include "gnunet_crypto_lib.h"
40 #include "gnunet_signatures.h"
43 * The UDP-Socket through which DNS-Resolves will be sent if they are not to be
44 * sent through gnunet. The port of this socket will not be hijacked.
46 static struct GNUNET_NETWORK_Handle *dnsout;
49 * The port bound to the socket dnsout
51 static unsigned short dnsoutport;
54 * A handle to the DHT-Service
56 static struct GNUNET_DHT_Handle *dht;
59 * The configuration to use
61 static const struct GNUNET_CONFIGURATION_Handle *cfg;
64 * The handle to the service-configuration
66 static struct GNUNET_CONFIGURATION_Handle *servicecfg;
69 * A list of DNS-Responses that have to be sent to the requesting client
71 static struct answer_packet_list *head;
74 * The tail of the list of DNS-responses
76 static struct answer_packet_list *tail;
79 * A structure containing a mapping from network-byte-ordered DNS-id to
80 * some information needed to handle this query
82 * It currently allocates at least
83 * (1 + machine-width + 32 + 32 + 16 + machine-width + 8) * 65536 bit
84 * = 1.7 MiB on 64 bit.
85 * = 1.2 MiB on 32 bit.
89 struct GNUNET_SERVER_Client* client;
91 unsigned remote_ip:32;
92 unsigned local_port:16;
95 } query_states[65536];
98 * A struct used to give more than one value as
99 * closure to receive_dht
101 struct receive_dht_cls {
103 struct GNUNET_DHT_GetHandle* handle;
107 * Hijack all outgoing DNS-Traffic but for traffic leaving "our" port.
110 hijack (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
114 struct GNUNET_OS_Process *proc;
117 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
120 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
121 "No entry 'VIRTDNS' in configuration!\n");
125 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Hijacking, port is %d\n", dnsoutport);
126 snprintf (port_s, 6, "%d", dnsoutport);
127 if (NULL != (proc = GNUNET_OS_start_process (NULL,
129 "gnunet-helper-hijack-dns",
131 port_s, virt_dns, NULL)))
132 GNUNET_OS_process_close (proc);
133 GNUNET_free (virt_dns);
137 * Delete the hijacking-routes
140 unhijack (unsigned short port)
144 struct GNUNET_OS_Process *proc;
147 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
150 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
151 "No entry 'VIRTDNS' in configuration!\n");
155 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "unHijacking, port is %d\n", port);
156 snprintf (port_s, 6, "%d", port);
157 if (NULL != (proc = GNUNET_OS_start_process (NULL,
159 "gnunet-helper-hijack-dns",
161 "-d", port_s, virt_dns, NULL)))
162 GNUNET_OS_process_close (proc);
163 GNUNET_free (virt_dns);
167 * Send the DNS-Response to the client. Gets called via the notify_transmit_ready-
171 send_answer(void* cls, size_t size, void* buf) {
172 struct answer_packet_list* query = head;
173 size_t len = ntohs(query->pkt.hdr.size);
175 GNUNET_assert(len <= size);
177 memcpy(buf, &query->pkt.hdr, len);
179 GNUNET_CONTAINER_DLL_remove (head, tail, query);
183 /* When more data is to be sent, reschedule */
185 GNUNET_SERVER_notify_transmit_ready(cls,
186 ntohs(head->pkt.hdr.size),
187 GNUNET_TIME_UNIT_FOREVER_REL,
195 send_rev_query(void * cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
196 struct dns_pkt_parsed* pdns = (struct dns_pkt_parsed*) cls;
198 unsigned short id = pdns->s.id;
200 if (query_states[id].valid != GNUNET_YES) return;
201 query_states[id].valid = GNUNET_NO;
203 GNUNET_assert(query_states[id].namelen == 74);
205 size_t len = sizeof(struct answer_packet) - 1 \
206 + sizeof(struct dns_static) \
207 + 74 /* this is the length of a reverse ipv6-lookup */ \
208 + sizeof(struct dns_query_line) \
209 + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
210 + sizeof(struct dns_record_line) - 1 \
211 - 2 /* We do not know the lenght of the answer yet*/ \
212 - 2 /* No idea why... */ ;
214 struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
215 memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
217 answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
218 answer->pkt.hdr.size = htons(len);
219 answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REV;
221 answer->pkt.from = query_states[id].remote_ip;
223 answer->pkt.to = query_states[id].local_ip;
224 answer->pkt.dst_port = query_states[id].local_port;
226 struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
232 dpkt->s.qdcount = htons(1);
233 dpkt->s.ancount = htons(1);
235 memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
236 GNUNET_free(query_states[id].name);
238 struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
239 dque->type = htons(12); /* PTR */
240 dque->class = htons(1); /* IN */
242 char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
243 memcpy(anname, (char[]){0xc0, 0x0c}, 2);
245 struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
246 drec_data->type = htons(12); /* AAAA */
247 drec_data->class = htons(1); /* IN */
248 drec_data->ttl = htonl(3600); /* FIXME: read from block */
250 /* Calculate at which offset in the packet the length of the name and the
251 * name, it is filled in by the daemon-vpn */
252 answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data_len)-(unsigned long)(&answer->pkt)));
254 GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
256 GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
258 GNUNET_TIME_UNIT_FOREVER_REL,
260 query_states[id].client);
264 * complete dns-packet with empty name in the answer
265 * provide offsett of the name
270 * Receive a block from the dht.
273 receive_dht(void *cls,
274 struct GNUNET_TIME_Absolute exp,
275 const GNUNET_HashCode *key,
276 const struct GNUNET_PeerIdentity *const *get_path,
277 const struct GNUNET_PeerIdentity *const *put_path,
278 enum GNUNET_BLOCK_Type type,
282 unsigned short id = ((struct receive_dht_cls*)cls)->id;
283 struct GNUNET_DHT_GetHandle* handle = ((struct receive_dht_cls*)cls)->handle;
286 GNUNET_assert(type == GNUNET_BLOCK_TYPE_DNS);
288 /* If no query with this id is pending, ignore the block */
289 if (query_states[id].valid != GNUNET_YES) return;
290 query_states[id].valid = GNUNET_NO;
292 const struct GNUNET_DNS_Record* rec = data;
293 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
294 "Got block of size %d, peer: %08x, desc: %08x\n",
296 *((unsigned int*)&rec->peer),
297 *((unsigned int*)&rec->service_descriptor));
299 size_t len = sizeof(struct answer_packet) - 1 \
300 + sizeof(struct dns_static) \
301 + query_states[id].namelen \
302 + sizeof(struct dns_query_line) \
303 + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
304 + sizeof(struct dns_record_line) - 1 \
305 + 16; /* To hold the IPv6-Address */
307 struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
308 memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
310 answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
311 answer->pkt.hdr.size = htons(len);
312 answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_SERVICE;
314 GNUNET_CRYPTO_hash(&rec->peer,
315 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
316 &answer->pkt.service_descr.peer);
318 memcpy(&answer->pkt.service_descr.service_descriptor,
319 &rec->service_descriptor,
320 sizeof(GNUNET_HashCode));
321 memcpy(&answer->pkt.service_descr.service_type,
323 sizeof(answer->pkt.service_descr.service_type));
324 memcpy(&answer->pkt.service_descr.ports, &rec->ports, sizeof(answer->pkt.service_descr.ports));
326 answer->pkt.from = query_states[id].remote_ip;
328 answer->pkt.to = query_states[id].local_ip;
329 answer->pkt.dst_port = query_states[id].local_port;
331 struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
337 dpkt->s.qdcount = htons(1);
338 dpkt->s.ancount = htons(1);
340 memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
341 GNUNET_free(query_states[id].name);
343 struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
344 dque->type = htons(28); /* AAAA */
345 dque->class = htons(1); /* IN */
347 char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
348 memcpy(anname, (char[]){0xc0, 0x0c}, 2);
350 struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
351 drec_data->type = htons(28); /* AAAA */
352 drec_data->class = htons(1); /* IN */
353 drec_data->ttl = htonl(3600); /* FIXME: read from block */
354 drec_data->data_len = htons(16);
356 /* Calculate at which offset in the packet the IPv6-Address belongs, it is
357 * filled in by the daemon-vpn */
358 answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data)-(unsigned long)(&answer->pkt)));
360 GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
362 GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
364 GNUNET_TIME_UNIT_FOREVER_REL,
366 query_states[id].client);
368 GNUNET_DHT_get_stop(handle);
372 * This receives a GNUNET_MESSAGE_TYPE_REHIJACK and rehijacks the DNS
376 struct GNUNET_SERVER_Client *client,
377 const struct GNUNET_MessageHeader *message) {
378 unhijack(dnsoutport);
379 GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
381 GNUNET_SERVER_receive_done(client, GNUNET_OK);
385 * This receives the dns-payload from the daemon-vpn and sends it on over the udp-socket
388 receive_query(void *cls,
389 struct GNUNET_SERVER_Client *client,
390 const struct GNUNET_MessageHeader *message) {
391 struct query_packet* pkt = (struct query_packet*)message;
392 struct dns_pkt* dns = (struct dns_pkt*)pkt->data;
393 struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
395 query_states[dns->s.id].valid = GNUNET_YES;
396 query_states[dns->s.id].client = client;
397 query_states[dns->s.id].local_ip = pkt->orig_from;
398 query_states[dns->s.id].local_port = pkt->src_port;
399 query_states[dns->s.id].remote_ip = pkt->orig_to;
400 query_states[dns->s.id].namelen = strlen((char*)dns->data) + 1;
401 query_states[dns->s.id].name = GNUNET_malloc(query_states[dns->s.id].namelen);
402 memcpy(query_states[dns->s.id].name, dns->data, query_states[dns->s.id].namelen);
404 /* The query is for a .gnunet-address */
405 if (pdns->queries[0]->namelen > 9 &&
406 0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - 9), ".gnunet.", 9))
408 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for .gnunet!\n");
410 GNUNET_CRYPTO_hash(pdns->queries[0]->name, pdns->queries[0]->namelen, &key);
412 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
413 "Getting with key %08x, len is %d\n",
414 *((unsigned int*)&key),
415 pdns->queries[0]->namelen);
417 struct receive_dht_cls* cls = GNUNET_malloc(sizeof(struct receive_dht_cls));
420 cls->handle = GNUNET_DHT_get_start(dht,
421 GNUNET_TIME_UNIT_MINUTES,
422 GNUNET_BLOCK_TYPE_DNS,
424 DEFAULT_GET_REPLICATION,
436 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for '%s'; namelen=%d\n", pdns->queries[0]->name, pdns->queries[0]->namelen);
437 /* The query is for a PTR of a previosly resolved virtual IP */
438 if (htons(pdns->queries[0]->qtype) == 12 &&
439 74 == pdns->queries[0]->namelen)
443 char ipv6rev[74] = "X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.ip6.arpa.";
445 unsigned long long ipv6prefix;
446 unsigned int comparelen;
448 GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "vpn", "IPV6ADDR", &ipv6addr));
449 inet_pton (AF_INET6, ipv6addr, ipv6);
450 GNUNET_free(ipv6addr);
452 GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "vpn", "IPV6PREFIX", &ipv6prefix));
453 GNUNET_assert(ipv6prefix < 127);
454 ipv6prefix = (ipv6prefix + 7)/8;
456 for (i = ipv6prefix; i < 16; i++)
459 for (i = 0; i < 16; i++)
461 unsigned char c1 = ipv6[i] >> 4;
462 unsigned char c2 = ipv6[i] & 0xf;
465 ipv6rev[62-(4*i)] = c1 + '0';
467 ipv6rev[62-(4*i)] = c1 + 87; /* 87 is the difference between 'a' and 10 */
470 ipv6rev[62-((4*i)+2)] = c2 + '0';
472 ipv6rev[62-((4*i)+2)] = c2 + 87;
474 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "My network is %s'.\n", ipv6rev);
475 comparelen = 10 + 4*ipv6prefix;
476 if(0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - comparelen),
477 ipv6rev + (74 - comparelen),
480 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Reverse-Query for .gnunet!\n");
482 GNUNET_SCHEDULER_add_now(send_rev_query, pdns);
488 /* The query should be sent to the network */
490 struct sockaddr_in dest;
491 memset(&dest, 0, sizeof dest);
492 dest.sin_port = htons(53);
493 dest.sin_addr.s_addr = pkt->orig_to;
495 GNUNET_NETWORK_socket_sendto(dnsout,
497 ntohs(pkt->hdr.size) - sizeof(struct query_packet) + 1,
498 (struct sockaddr*) &dest,
502 free_parsed_dns_packet(pdns);
505 GNUNET_SERVER_receive_done(client, GNUNET_OK);
509 * Read a response-packet of the UDP-Socket
512 read_response (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
513 unsigned char buf[65536];
514 struct dns_pkt* dns = (struct dns_pkt*)buf;
516 if (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
519 struct sockaddr_in addr;
520 memset(&addr, 0, sizeof addr);
521 socklen_t addrlen = sizeof addr;
524 r = GNUNET_NETWORK_socket_recvfrom(dnsout,
527 (struct sockaddr*)&addr,
530 /* if (r < 0) FIXME */
532 if (query_states[dns->s.id].valid == GNUNET_YES) {
533 query_states[dns->s.id].valid = GNUNET_NO;
535 size_t len = sizeof(struct answer_packet) + r - 1; /* 1 for the unsigned char data[1]; */
536 struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
537 answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
538 answer->pkt.hdr.size = htons(len);
539 answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_IP;
540 answer->pkt.from = addr.sin_addr.s_addr;
541 answer->pkt.to = query_states[dns->s.id].local_ip;
542 answer->pkt.dst_port = query_states[dns->s.id].local_port;
543 memcpy(answer->pkt.data, buf, r);
545 GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
547 GNUNET_SERVER_notify_transmit_ready(query_states[dns->s.id].client,
549 GNUNET_TIME_UNIT_FOREVER_REL,
551 query_states[dns->s.id].client);
554 GNUNET_SCHEDULER_add_read_net(GNUNET_TIME_UNIT_FOREVER_REL,
562 * Task run during shutdown.
568 cleanup_task (void *cls,
569 const struct GNUNET_SCHEDULER_TaskContext *tc)
571 unhijack(dnsoutport);
572 GNUNET_DHT_disconnect(dht);
576 * @brief Create a port-map from udp and tcp redirects
578 * @param udp_redirects
579 * @param tcp_redirects
584 get_port_from_redirects (const char *udp_redirects, const char *tcp_redirects)
587 char* cpy, *hostname, *redirect;
588 int local_port, count = 0;
590 if (NULL != udp_redirects)
592 cpy = GNUNET_strdup (udp_redirects);
593 for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
595 if (NULL == (hostname = strstr (redirect, ":")))
601 local_port = atoi (redirect);
602 GNUNET_assert ((local_port > 0) && (local_port < 65536)); // FIXME: don't crash!!!
604 ret |= (0xFFFF & htons(local_port));
618 if (NULL != tcp_redirects)
620 cpy = GNUNET_strdup (tcp_redirects);
621 for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
623 if (NULL == (hostname = strstr (redirect, ":")))
629 local_port = atoi (redirect);
630 GNUNET_assert ((local_port > 0) && (local_port < 65536)); // FIXME: don't crash!!!
632 ret |= (0xFFFF & htons(local_port));
653 publish_name (const char *name, uint64_t ports, uint32_t service_type,
654 struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key)
656 size_t size = sizeof (struct GNUNET_DNS_Record);
657 struct GNUNET_DNS_Record data;
658 memset (&data, 0, size);
661 htonl (size - sizeof (struct GNUNET_CRYPTO_RsaSignature));
662 data.purpose.purpose = GNUNET_SIGNATURE_PURPOSE_DNS_RECORD;
664 GNUNET_CRYPTO_hash (name, strlen (name) + 1, &data.service_descriptor);
665 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Store with key1 %x\n",
666 *((unsigned long long *) &data.service_descriptor));
668 data.service_type = service_type;
671 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &data.peer);
673 data.expiration_time =
674 GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_HOURS, 2));
677 if (GNUNET_OK != GNUNET_CRYPTO_rsa_sign (my_private_key,
678 &data.purpose, &data.signature))
680 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not sign DNS_Record\n");
684 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
685 "Putting with key %08x, size = %d\n",
686 *((unsigned int *) &data.service_descriptor), size);
689 &data.service_descriptor,
690 DEFAULT_PUT_REPLICATION,
692 GNUNET_BLOCK_TYPE_DNS,
695 GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_HOURS),
696 GNUNET_TIME_UNIT_MINUTES, NULL, NULL);
700 * @brief Publishes the record defined by the section section
703 * @param section the current section
706 publish_iterate (void *cls, const char *section)
708 char *udp_redirects, *tcp_redirects, *alternative_names, *alternative_name,
711 GNUNET_CONFIGURATION_get_value_string (servicecfg, section,
712 "UDP_REDIRECTS", &udp_redirects);
713 GNUNET_CONFIGURATION_get_value_string (servicecfg, section, "TCP_REDIRECTS",
716 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "GNUNETD",
720 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not read keyfile-value\n");
722 GNUNET_free (keyfile);
726 struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key =
727 GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
728 GNUNET_free (keyfile);
729 GNUNET_assert (my_private_key != NULL);
731 uint64_t ports = get_port_from_redirects (udp_redirects, tcp_redirects);
732 uint32_t service_type = 0;
734 if (NULL != udp_redirects)
735 service_type = GNUNET_DNS_SERVICE_TYPE_UDP;
737 if (NULL != tcp_redirects)
738 service_type = GNUNET_DNS_SERVICE_TYPE_TCP;
740 service_type = htonl (service_type);
743 publish_name (section, ports, service_type, my_private_key);
745 GNUNET_CONFIGURATION_get_value_string (servicecfg, section,
748 for (alternative_name = strtok (alternative_names, " ");
749 alternative_name != NULL; alternative_name = strtok (NULL, " "))
752 alloca (strlen (alternative_name) + strlen (section) + 1 + 1);
753 strcpy (altname, alternative_name);
754 strcpy (altname + strlen (alternative_name) + 1, section);
755 altname[strlen (alternative_name)] = '.';
757 publish_name (altname, ports, service_type, my_private_key);
760 GNUNET_free_non_null(alternative_names);
761 GNUNET_CRYPTO_rsa_key_free (my_private_key);
762 GNUNET_free_non_null (udp_redirects);
763 GNUNET_free_non_null (tcp_redirects);
767 * Publish a DNS-record in the DHT. This is up to now just for testing.
770 publish_names (void *cls,
771 const struct GNUNET_SCHEDULER_TaskContext *tc) {
773 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
776 if (NULL != servicecfg)
777 GNUNET_CONFIGURATION_destroy(servicecfg);
779 GNUNET_CONFIGURATION_get_value_filename(cfg, "dns", "SERVICES", &services);
781 servicecfg = GNUNET_CONFIGURATION_create();
782 if (GNUNET_OK == GNUNET_CONFIGURATION_parse(servicecfg, services))
784 GNUNET_log(GNUNET_ERROR_TYPE_INFO, "Parsing services %s\n", services);
785 GNUNET_CONFIGURATION_iterate_sections(servicecfg, publish_iterate, NULL);
787 if (NULL != services)
788 GNUNET_free(services);
790 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_HOURS,
797 * @param server the initialized server
798 * @param cfg_ configuration to use
802 struct GNUNET_SERVER_Handle *server,
803 const struct GNUNET_CONFIGURATION_Handle *cfg_)
805 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
806 /* callback, cls, type, size */
807 {&receive_query, NULL, GNUNET_MESSAGE_TYPE_LOCAL_QUERY_DNS, 0},
808 {&rehijack, NULL, GNUNET_MESSAGE_TYPE_REHIJACK, sizeof(struct GNUNET_MessageHeader)},
815 for (i = 0; i < 65536; i++) {
816 query_states[i].valid = GNUNET_NO;
819 dht = GNUNET_DHT_connect(cfg, 1024);
821 struct sockaddr_in addr;
823 dnsout = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0);
826 memset(&addr, 0, sizeof(struct sockaddr_in));
828 int err = GNUNET_NETWORK_socket_bind (dnsout,
829 (struct sockaddr*)&addr,
830 sizeof(struct sockaddr_in));
832 if (err != GNUNET_YES) {
833 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Could not bind a port, exiting\n");
837 /* Read the port we bound to */
838 socklen_t addrlen = sizeof(struct sockaddr_in);
839 err = getsockname(GNUNET_NETWORK_get_fd(dnsout),
840 (struct sockaddr*) &addr,
843 dnsoutport = htons(addr.sin_port);
845 GNUNET_SCHEDULER_add_now (publish_names, NULL);
847 GNUNET_SCHEDULER_add_read_net(GNUNET_TIME_UNIT_FOREVER_REL, dnsout, &read_response, NULL);
849 GNUNET_SERVER_add_handlers (server, handlers);
850 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
856 * The main function for the dns service.
858 * @param argc number of arguments from the command line
859 * @param argv command line arguments
860 * @return 0 ok, 1 on error
863 main (int argc, char *const *argv)
866 GNUNET_SERVICE_run (argc,
869 GNUNET_SERVICE_OPTION_NONE,
870 &run, NULL)) ? 0 : 1;