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_applications.h"
33 #include "gnunet-vpn-packet.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_mesh_service.h"
41 #include "gnunet_signatures.h"
43 struct GNUNET_MESH_Handle *mesh_handle;
46 * The UDP-Socket through which DNS-Resolves will be sent if they are not to be
47 * sent through gnunet. The port of this socket will not be hijacked.
49 static struct GNUNET_NETWORK_Handle *dnsout;
52 * The port bound to the socket dnsout
54 static unsigned short dnsoutport;
57 * A handle to the DHT-Service
59 static struct GNUNET_DHT_Handle *dht;
62 * The configuration to use
64 static const struct GNUNET_CONFIGURATION_Handle *cfg;
67 * The handle to the service-configuration
69 static struct GNUNET_CONFIGURATION_Handle *servicecfg;
72 * A list of DNS-Responses that have to be sent to the requesting client
74 static struct answer_packet_list *head;
77 * The tail of the list of DNS-responses
79 static struct answer_packet_list *tail;
82 * A structure containing a mapping from network-byte-ordered DNS-id (16 bit) to
83 * some information needed to handle this query
85 * It currently allocates at least
86 * (1 + machine-width + 32 + 32 + 16 + machine-width + 8) * 65536 bit
87 * = 1.7 MiB on 64 bit.
88 * = 1.2 MiB on 32 bit.
92 struct GNUNET_SERVER_Client* client;
98 } query_states[UINT16_MAX];
101 * A struct used to give more than one value as
102 * closure to receive_dht
104 struct receive_dht_cls {
106 struct GNUNET_DHT_GetHandle* handle;
110 * Hijack all outgoing DNS-Traffic but for traffic leaving "our" port.
113 hijack (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
117 struct GNUNET_OS_Process *proc;
120 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
123 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
124 "No entry 'VIRTDNS' in configuration!\n");
128 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Hijacking, port is %d\n", dnsoutport);
129 snprintf (port_s, 6, "%d", dnsoutport);
130 if (NULL != (proc = GNUNET_OS_start_process (NULL,
132 "gnunet-helper-hijack-dns",
134 port_s, virt_dns, NULL)))
135 GNUNET_OS_process_close (proc);
136 GNUNET_free (virt_dns);
140 * Delete the hijacking-routes
143 unhijack (unsigned short port)
147 struct GNUNET_OS_Process *proc;
150 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
153 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
154 "No entry 'VIRTDNS' in configuration!\n");
158 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "unHijacking, port is %d\n", port);
159 snprintf (port_s, 6, "%d", port);
160 if (NULL != (proc = GNUNET_OS_start_process (NULL,
162 "gnunet-helper-hijack-dns",
164 "-d", port_s, virt_dns, NULL)))
165 GNUNET_OS_process_close (proc);
166 GNUNET_free (virt_dns);
170 * Send the DNS-Response to the client. Gets called via the notify_transmit_ready-
174 send_answer(void* cls, size_t size, void* buf) {
175 struct answer_packet_list* query = head;
176 size_t len = ntohs(query->pkt.hdr.size);
178 GNUNET_assert(len <= size);
180 memcpy(buf, &query->pkt.hdr, len);
182 GNUNET_CONTAINER_DLL_remove (head, tail, query);
186 /* When more data is to be sent, reschedule */
188 GNUNET_SERVER_notify_transmit_ready(cls,
189 ntohs(head->pkt.hdr.size),
190 GNUNET_TIME_UNIT_FOREVER_REL,
198 struct GNUNET_MESH_Tunnel *tunnel;
199 struct GNUNET_MessageHeader hdr;
203 struct tunnel_cls *remote_pending[UINT16_MAX];
207 mesh_send (void *cls, size_t size, void *buf)
209 struct tunnel_cls *cls_ = (struct tunnel_cls *) cls;
211 GNUNET_assert(cls_->hdr.size <= size);
213 size = cls_->hdr.size;
214 cls_->hdr.size = htons(cls_->hdr.size);
216 memcpy(buf, &cls_->hdr, size);
221 void mesh_connect (void* cls, const struct GNUNET_PeerIdentity* peer, const struct GNUNET_TRANSPORT_ATS_Information *atsi) {
222 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Connected to peer %x\n", *((unsigned long*)peer));
223 struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
225 GNUNET_MESH_notify_transmit_ready(cls_->tunnel,
228 GNUNET_TIME_UNIT_MINUTES,
237 send_mesh_query (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
239 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
242 struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
244 cls_->tunnel = GNUNET_MESH_peer_request_connect_by_type(mesh_handle,
245 GNUNET_TIME_UNIT_HOURS,
246 GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
251 remote_pending[cls_->dns.s.id] = cls_;
255 receive_mesh_query (void *cls,
256 struct GNUNET_MESH_Tunnel *tunnel,
258 const struct GNUNET_PeerIdentity *sender,
259 const struct GNUNET_MessageHeader *message,
260 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
262 return GNUNET_SYSERR;
266 receive_mesh_answer (void *cls,
267 struct GNUNET_MESH_Tunnel *tunnel,
269 const struct GNUNET_PeerIdentity *sender,
270 const struct GNUNET_MessageHeader *message,
271 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
273 /* TODo: size check */
274 struct dns_pkt *dns = (struct dns_pkt *) (message + 1);
276 /* They sent us a packet we were not waiting for */
277 if (remote_pending[dns->s.id] == NULL
278 || remote_pending[dns->s.id]->tunnel != tunnel)
279 return GNUNET_SYSERR;
280 if (query_states[dns->s.id].valid != GNUNET_YES)
281 return GNUNET_SYSERR;
282 query_states[dns->s.id].valid = GNUNET_NO;
284 size_t len = sizeof (struct answer_packet) - 1 + sizeof (struct dns_static) + query_states[dns->s.id].namelen + sizeof (struct dns_query_line) + 2 /* To hold the pointer (as defined in RFC1035) to the name */
285 + sizeof (struct dns_record_line) - 1 + 16; /* To hold the IPv6-Address */
287 struct answer_packet_list *answer =
288 GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
289 memset (answer, 0, len + 2 * sizeof (struct answer_packet_list *));
291 answer->pkt.hdr.type = htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
292 answer->pkt.hdr.size = htons (len);
293 answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REMOTE;
295 struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
297 if (ntohs(pdns->s.ancount) < 1)
299 free_parsed_dns_packet(pdns);
303 answer->pkt.addrsize = pdns->answers[0]->data_len;
304 memcpy(answer->pkt.addr, pdns->answers[0]->data, ntohs(pdns->answers[0]->data_len));
306 answer->pkt.from = query_states[dns->s.id].remote_ip;
308 answer->pkt.to = query_states[dns->s.id].local_ip;
309 answer->pkt.dst_port = query_states[dns->s.id].local_port;
311 struct dns_pkt *dpkt = (struct dns_pkt *) answer->pkt.data;
313 dpkt->s.id = dns->s.id;
317 dpkt->s.qdcount = htons (1);
318 dpkt->s.ancount = htons (1);
320 memcpy (dpkt->data, query_states[dns->s.id].name,
321 query_states[dns->s.id].namelen);
322 GNUNET_free (query_states[dns->s.id].name);
324 struct dns_query_line *dque =
325 (struct dns_query_line *) (dpkt->data +
326 (query_states[dns->s.id].namelen));
327 dque->type = htons (28); /* AAAA */
328 dque->class = htons (1); /* IN */
331 (char *) (dpkt->data + (query_states[dns->s.id].namelen) +
332 sizeof (struct dns_query_line));
333 memcpy (anname, "\xc0\x0c", 2);
335 struct dns_record_line *drec_data =
336 (struct dns_record_line *) (dpkt->data +
337 (query_states[dns->s.id].namelen) +
338 sizeof (struct dns_query_line) + 2);
339 drec_data->type = htons (28); /* AAAA */
340 drec_data->class = htons (1); /* IN */
342 drec_data->ttl = pdns->answers[0]->ttl;
343 drec_data->data_len = htons (16);
345 /* Calculate at which offset in the packet the IPv6-Address belongs, it is
346 * filled in by the daemon-vpn */
347 answer->pkt.addroffset =
348 htons ((unsigned short) ((unsigned long) (&drec_data->data) -
349 (unsigned long) (&answer->pkt)));
351 GNUNET_CONTAINER_DLL_insert_after (head, tail, tail, answer);
353 GNUNET_SERVER_notify_transmit_ready (query_states[dns->s.id].client,
355 GNUNET_TIME_UNIT_FOREVER_REL,
357 query_states[dns->s.id].client);
359 free_parsed_dns_packet(pdns);
365 send_rev_query(void * cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
366 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
369 struct dns_pkt_parsed* pdns = (struct dns_pkt_parsed*) cls;
371 unsigned short id = pdns->s.id;
373 free_parsed_dns_packet(pdns);
375 if (query_states[id].valid != GNUNET_YES) return;
376 query_states[id].valid = GNUNET_NO;
378 GNUNET_assert(query_states[id].namelen == 74);
380 size_t len = sizeof(struct answer_packet) - 1 \
381 + sizeof(struct dns_static) \
382 + 74 /* this is the length of a reverse ipv6-lookup */ \
383 + sizeof(struct dns_query_line) \
384 + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
385 + sizeof(struct dns_record_line) - 1 \
386 - 2 /* We do not know the lenght of the answer yet*/;
388 struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
389 memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
391 answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
392 answer->pkt.hdr.size = htons(len);
393 answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REV;
395 answer->pkt.from = query_states[id].remote_ip;
397 answer->pkt.to = query_states[id].local_ip;
398 answer->pkt.dst_port = query_states[id].local_port;
400 struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
406 dpkt->s.qdcount = htons(1);
407 dpkt->s.ancount = htons(1);
409 memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
410 GNUNET_free(query_states[id].name);
412 struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
413 dque->type = htons(12); /* PTR */
414 dque->class = htons(1); /* IN */
416 char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
417 memcpy(anname, "\xc0\x0c", 2);
419 struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
420 drec_data->type = htons(12); /* AAAA */
421 drec_data->class = htons(1); /* IN */
422 /* FIXME: read the TTL from block:
423 * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
425 * But how to get the seconds out of this?
427 drec_data->ttl = htonl(3600);
429 /* Calculate at which offset in the packet the length of the name and the
430 * name, it is filled in by the daemon-vpn */
431 answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data_len)-(unsigned long)(&answer->pkt)));
433 GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
435 GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
437 GNUNET_TIME_UNIT_FOREVER_REL,
439 query_states[id].client);
443 * Receive a block from the dht.
446 receive_dht(void *cls,
447 struct GNUNET_TIME_Absolute exp,
448 const GNUNET_HashCode *key,
449 const struct GNUNET_PeerIdentity *const *get_path,
450 const struct GNUNET_PeerIdentity *const *put_path,
451 enum GNUNET_BLOCK_Type type,
455 unsigned short id = ((struct receive_dht_cls*)cls)->id;
456 struct GNUNET_DHT_GetHandle* handle = ((struct receive_dht_cls*)cls)->handle;
459 GNUNET_assert(type == GNUNET_BLOCK_TYPE_DNS);
461 /* If no query with this id is pending, ignore the block */
462 if (query_states[id].valid != GNUNET_YES) return;
463 query_states[id].valid = GNUNET_NO;
465 const struct GNUNET_DNS_Record* rec = data;
466 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
467 "Got block of size %d, peer: %08x, desc: %08x\n",
469 *((unsigned int*)&rec->peer),
470 *((unsigned int*)&rec->service_descriptor));
472 size_t len = sizeof(struct answer_packet) - 1 \
473 + sizeof(struct dns_static) \
474 + query_states[id].namelen \
475 + sizeof(struct dns_query_line) \
476 + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
477 + sizeof(struct dns_record_line) - 1 \
478 + 16; /* To hold the IPv6-Address */
480 struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
481 memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
483 answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
484 answer->pkt.hdr.size = htons(len);
485 answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_SERVICE;
487 GNUNET_CRYPTO_hash(&rec->peer,
488 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
489 &answer->pkt.service_descr.peer);
491 memcpy(&answer->pkt.service_descr.service_descriptor,
492 &rec->service_descriptor,
493 sizeof(GNUNET_HashCode));
494 memcpy(&answer->pkt.service_descr.service_type,
496 sizeof(answer->pkt.service_descr.service_type));
497 memcpy(&answer->pkt.service_descr.ports, &rec->ports, sizeof(answer->pkt.service_descr.ports));
499 answer->pkt.from = query_states[id].remote_ip;
501 answer->pkt.to = query_states[id].local_ip;
502 answer->pkt.dst_port = query_states[id].local_port;
504 struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
510 dpkt->s.qdcount = htons(1);
511 dpkt->s.ancount = htons(1);
513 memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
514 GNUNET_free(query_states[id].name);
516 struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
517 dque->type = htons(28); /* AAAA */
518 dque->class = htons(1); /* IN */
520 char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
521 memcpy(anname, "\xc0\x0c", 2);
523 struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
524 drec_data->type = htons(28); /* AAAA */
525 drec_data->class = htons(1); /* IN */
527 /* FIXME: read the TTL from block:
528 * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
530 * But how to get the seconds out of this?
532 drec_data->ttl = htonl(3600);
533 drec_data->data_len = htons(16);
535 /* Calculate at which offset in the packet the IPv6-Address belongs, it is
536 * filled in by the daemon-vpn */
537 answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data)-(unsigned long)(&answer->pkt)));
539 GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
541 GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
543 GNUNET_TIME_UNIT_FOREVER_REL,
545 query_states[id].client);
547 GNUNET_DHT_get_stop(handle);
551 * This receives a GNUNET_MESSAGE_TYPE_REHIJACK and rehijacks the DNS
555 struct GNUNET_SERVER_Client *client,
556 const struct GNUNET_MessageHeader *message) {
557 unhijack(dnsoutport);
558 GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
560 GNUNET_SERVER_receive_done(client, GNUNET_OK);
564 * This receives the dns-payload from the daemon-vpn and sends it on over the udp-socket
567 receive_query(void *cls,
568 struct GNUNET_SERVER_Client *client,
569 const struct GNUNET_MessageHeader *message) {
570 struct query_packet* pkt = (struct query_packet*)message;
571 struct dns_pkt* dns = (struct dns_pkt*)pkt->data;
572 struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
574 query_states[dns->s.id].valid = GNUNET_YES;
575 query_states[dns->s.id].client = client;
576 query_states[dns->s.id].local_ip = pkt->orig_from;
577 query_states[dns->s.id].local_port = pkt->src_port;
578 query_states[dns->s.id].remote_ip = pkt->orig_to;
579 query_states[dns->s.id].namelen = strlen((char*)dns->data) + 1;
580 query_states[dns->s.id].name = GNUNET_malloc(query_states[dns->s.id].namelen);
581 memcpy(query_states[dns->s.id].name, dns->data, query_states[dns->s.id].namelen);
583 /* The query is for a .gnunet-address */
584 if (pdns->queries[0]->namelen > 9 &&
585 0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - 9), ".gnunet.", 9))
587 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for .gnunet!\n");
589 GNUNET_CRYPTO_hash(pdns->queries[0]->name, pdns->queries[0]->namelen, &key);
591 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
592 "Getting with key %08x, len is %d\n",
593 *((unsigned int*)&key),
594 pdns->queries[0]->namelen);
596 struct receive_dht_cls* cls = GNUNET_malloc(sizeof(struct receive_dht_cls));
599 cls->handle = GNUNET_DHT_get_start(dht,
600 GNUNET_TIME_UNIT_MINUTES,
601 GNUNET_BLOCK_TYPE_DNS,
603 DEFAULT_GET_REPLICATION,
615 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for '%s'; namelen=%d\n", pdns->queries[0]->name, pdns->queries[0]->namelen);
617 /* This is a PTR-Query. Check if it is for "our" network */
618 if (htons(pdns->queries[0]->qtype) == 12 &&
619 74 == pdns->queries[0]->namelen)
623 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.";
625 unsigned long long ipv6prefix;
626 unsigned int comparelen;
628 GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "vpn", "IPV6ADDR", &ipv6addr));
629 inet_pton (AF_INET6, ipv6addr, ipv6);
630 GNUNET_free(ipv6addr);
632 GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "vpn", "IPV6PREFIX", &ipv6prefix));
633 GNUNET_assert(ipv6prefix < 127);
634 ipv6prefix = (ipv6prefix + 7)/8;
636 for (i = ipv6prefix; i < 16; i++)
639 for (i = 0; i < 16; i++)
641 unsigned char c1 = ipv6[i] >> 4;
642 unsigned char c2 = ipv6[i] & 0xf;
645 ipv6rev[62-(4*i)] = c1 + '0';
647 ipv6rev[62-(4*i)] = c1 + 87; /* 87 is the difference between 'a' and 10 */
650 ipv6rev[62-((4*i)+2)] = c2 + '0';
652 ipv6rev[62-((4*i)+2)] = c2 + 87;
654 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "My network is %s'.\n", ipv6rev);
655 comparelen = 10 + 4*ipv6prefix;
656 if(0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - comparelen),
657 ipv6rev + (74 - comparelen),
660 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Reverse-Query for .gnunet!\n");
662 GNUNET_SCHEDULER_add_now(send_rev_query, pdns);
671 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
674 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
675 "No entry 'VIRTDNS' in configuration!\n");
679 if (1 != inet_pton (AF_INET, virt_dns, &virt_dns_bytes))
681 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
682 "Error parsing 'VIRTDNS': %s; %m!\n", virt_dns);
686 GNUNET_free(virt_dns);
688 if (virt_dns_bytes == pkt->orig_to)
690 /* This is a packet that was sent directly to the virtual dns-server
692 * This means we have to send this query over gnunet
695 size_t size = sizeof(struct GNUNET_MESH_Tunnel*) + sizeof(struct GNUNET_MessageHeader) + (ntohs(message->size) - sizeof(struct query_packet) + 1);
696 struct tunnel_cls *cls_ = GNUNET_malloc(size);
697 cls_->hdr.size = size - sizeof(struct GNUNET_MESH_Tunnel*);
699 cls_->hdr.type = ntohs(GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS);
701 memcpy(&cls_->dns, dns, cls_->hdr.size);
702 GNUNET_SCHEDULER_add_now(send_mesh_query, cls_);
708 /* The query should be sent to the network */
710 struct sockaddr_in dest;
711 memset(&dest, 0, sizeof dest);
712 dest.sin_port = htons(53);
713 dest.sin_addr.s_addr = pkt->orig_to;
715 GNUNET_NETWORK_socket_sendto(dnsout,
717 ntohs(pkt->hdr.size) - sizeof(struct query_packet) + 1,
718 (struct sockaddr*) &dest,
722 free_parsed_dns_packet(pdns);
725 GNUNET_SERVER_receive_done(client, GNUNET_OK);
728 static void read_response (void *cls,
729 const struct GNUNET_SCHEDULER_TaskContext *tc);
734 struct sockaddr_in addr;
736 dnsout = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0);
739 memset (&addr, 0, sizeof (struct sockaddr_in));
741 int err = GNUNET_NETWORK_socket_bind (dnsout,
742 (struct sockaddr *) &addr,
743 sizeof (struct sockaddr_in));
745 if (err != GNUNET_YES)
747 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
748 "Could not bind a port, exiting\n");
752 /* Read the port we bound to */
753 socklen_t addrlen = sizeof (struct sockaddr_in);
754 err = getsockname (GNUNET_NETWORK_get_fd (dnsout),
755 (struct sockaddr *) &addr, &addrlen);
757 dnsoutport = htons (addr.sin_port);
759 GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, dnsout,
760 &read_response, NULL);
764 * Read a response-packet of the UDP-Socket
767 read_response (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
768 struct sockaddr_in addr;
769 socklen_t addrlen = sizeof (addr);
773 if (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
776 memset(&addr, 0, sizeof addr);
779 if (0 != ioctl (GNUNET_NETWORK_get_fd (dnsout),
782 unhijack(dnsoutport);
784 GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
788 /* port the code above? */
792 unsigned char buf[len];
793 struct dns_pkt* dns = (struct dns_pkt*)buf;
795 r = GNUNET_NETWORK_socket_recvfrom (dnsout,
798 (struct sockaddr*)&addr,
803 unhijack(dnsoutport);
805 GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
809 if (query_states[dns->s.id].valid == GNUNET_YES)
811 query_states[dns->s.id].valid = GNUNET_NO;
813 size_t len = sizeof(struct answer_packet) + r - 1; /* 1 for the unsigned char data[1]; */
814 struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
815 answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
816 answer->pkt.hdr.size = htons(len);
817 answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_IP;
818 answer->pkt.from = addr.sin_addr.s_addr;
819 answer->pkt.to = query_states[dns->s.id].local_ip;
820 answer->pkt.dst_port = query_states[dns->s.id].local_port;
821 memcpy(answer->pkt.data, buf, r);
823 GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
825 GNUNET_SERVER_notify_transmit_ready(query_states[dns->s.id].client,
827 GNUNET_TIME_UNIT_FOREVER_REL,
829 query_states[dns->s.id].client);
832 GNUNET_SCHEDULER_add_read_net(GNUNET_TIME_UNIT_FOREVER_REL,
840 * Task run during shutdown.
846 cleanup_task (void *cls,
847 const struct GNUNET_SCHEDULER_TaskContext *tc)
849 unhijack(dnsoutport);
850 GNUNET_DHT_disconnect(dht);
854 * @brief Create a port-map from udp and tcp redirects
856 * @param udp_redirects
857 * @param tcp_redirects
862 get_port_from_redirects (const char *udp_redirects, const char *tcp_redirects)
865 char* cpy, *hostname, *redirect;
866 int local_port, count = 0;
868 if (NULL != udp_redirects)
870 cpy = GNUNET_strdup (udp_redirects);
871 for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
873 if (NULL == (hostname = strstr (redirect, ":")))
875 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
879 local_port = atoi (redirect);
880 if (!((local_port > 0) && (local_port < 65536)))
881 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
883 ret |= (0xFFFF & htons(local_port));
897 if (NULL != tcp_redirects)
899 cpy = GNUNET_strdup (tcp_redirects);
900 for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
902 if (NULL == (hostname = strstr (redirect, ":")))
904 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
908 local_port = atoi (redirect);
909 if (!((local_port > 0) && (local_port < 65536)))
910 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
912 ret |= (0xFFFF & htons(local_port));
933 publish_name (const char *name, uint64_t ports, uint32_t service_type,
934 struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key)
936 size_t size = sizeof (struct GNUNET_DNS_Record);
937 struct GNUNET_DNS_Record data;
938 memset (&data, 0, size);
941 htonl (size - sizeof (struct GNUNET_CRYPTO_RsaSignature));
942 data.purpose.purpose = GNUNET_SIGNATURE_PURPOSE_DNS_RECORD;
944 GNUNET_CRYPTO_hash (name, strlen (name) + 1, &data.service_descriptor);
945 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Store with key1 %x\n",
946 *((unsigned long long *) &data.service_descriptor));
948 data.service_type = service_type;
951 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &data.peer);
953 data.expiration_time =
954 GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_HOURS, 2));
957 if (GNUNET_OK != GNUNET_CRYPTO_rsa_sign (my_private_key,
958 &data.purpose, &data.signature))
960 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not sign DNS_Record\n");
964 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
965 "Putting with key %08x, size = %d\n",
966 *((unsigned int *) &data.service_descriptor), size);
969 &data.service_descriptor,
970 DEFAULT_PUT_REPLICATION,
972 GNUNET_BLOCK_TYPE_DNS,
975 GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_HOURS),
976 GNUNET_TIME_UNIT_MINUTES, NULL, NULL);
980 * @brief Publishes the record defined by the section section
983 * @param section the current section
986 publish_iterate (void *cls, const char *section)
988 char *udp_redirects, *tcp_redirects, *alternative_names, *alternative_name,
991 GNUNET_CONFIGURATION_get_value_string (servicecfg, section,
992 "UDP_REDIRECTS", &udp_redirects);
993 GNUNET_CONFIGURATION_get_value_string (servicecfg, section, "TCP_REDIRECTS",
996 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "GNUNETD",
1000 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not read keyfile-value\n");
1001 if (keyfile != NULL)
1002 GNUNET_free (keyfile);
1006 struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key =
1007 GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
1008 GNUNET_free (keyfile);
1009 GNUNET_assert (my_private_key != NULL);
1011 uint64_t ports = get_port_from_redirects (udp_redirects, tcp_redirects);
1012 uint32_t service_type = 0;
1014 if (NULL != udp_redirects)
1015 service_type = GNUNET_DNS_SERVICE_TYPE_UDP;
1017 if (NULL != tcp_redirects)
1018 service_type |= GNUNET_DNS_SERVICE_TYPE_TCP;
1020 service_type = htonl (service_type);
1023 publish_name (section, ports, service_type, my_private_key);
1025 GNUNET_CONFIGURATION_get_value_string (servicecfg, section,
1026 "ALTERNATIVE_NAMES",
1027 &alternative_names);
1028 for (alternative_name = strtok (alternative_names, " ");
1029 alternative_name != NULL; alternative_name = strtok (NULL, " "))
1032 alloca (strlen (alternative_name) + strlen (section) + 1 + 1);
1033 strcpy (altname, alternative_name);
1034 strcpy (altname + strlen (alternative_name) + 1, section);
1035 altname[strlen (alternative_name)] = '.';
1037 publish_name (altname, ports, service_type, my_private_key);
1040 GNUNET_free_non_null(alternative_names);
1041 GNUNET_CRYPTO_rsa_key_free (my_private_key);
1042 GNUNET_free_non_null (udp_redirects);
1043 GNUNET_free_non_null (tcp_redirects);
1047 * Publish a DNS-record in the DHT. This is up to now just for testing.
1050 publish_names (void *cls,
1051 const struct GNUNET_SCHEDULER_TaskContext *tc) {
1053 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1056 if (NULL != servicecfg)
1057 GNUNET_CONFIGURATION_destroy(servicecfg);
1059 GNUNET_CONFIGURATION_get_value_filename(cfg, "dns", "SERVICES", &services);
1061 servicecfg = GNUNET_CONFIGURATION_create();
1062 if (GNUNET_OK == GNUNET_CONFIGURATION_parse(servicecfg, services))
1064 GNUNET_log(GNUNET_ERROR_TYPE_INFO, "Parsing services %s\n", services);
1065 GNUNET_CONFIGURATION_iterate_sections(servicecfg, publish_iterate, NULL);
1067 if (NULL != services)
1068 GNUNET_free(services);
1070 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_HOURS,
1076 * @param cls closure
1077 * @param server the initialized server
1078 * @param cfg_ configuration to use
1082 struct GNUNET_SERVER_Handle *server,
1083 const struct GNUNET_CONFIGURATION_Handle *cfg_)
1085 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
1086 /* callback, cls, type, size */
1087 {&receive_query, NULL, GNUNET_MESSAGE_TYPE_LOCAL_QUERY_DNS, 0},
1088 {&rehijack, NULL, GNUNET_MESSAGE_TYPE_REHIJACK,
1089 sizeof (struct GNUNET_MessageHeader)},
1093 static struct GNUNET_MESH_MessageHandler *mesh_handlers;
1095 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno(cfg_, "dns", "PROVIDE_EXIT"))
1096 mesh_handlers = (struct GNUNET_MESH_MessageHandler[]) {
1097 {receive_mesh_query, GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS, 0},
1101 mesh_handlers = (struct GNUNET_MESH_MessageHandler[]) {
1102 {receive_mesh_answer, GNUNET_MESSAGE_TYPE_REMOTE_ANSWER_DNS, 0},
1106 const static GNUNET_MESH_ApplicationType apptypes[] =
1107 { GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
1108 GNUNET_APPLICATION_TYPE_END
1111 mesh_handle = GNUNET_MESH_connect (cfg_, NULL, NULL, mesh_handlers, apptypes);
1116 for (i = 0; i < 65536; i++)
1118 query_states[i].valid = GNUNET_NO;
1121 dht = GNUNET_DHT_connect (cfg, 1024);
1125 GNUNET_SCHEDULER_add_now (publish_names, NULL);
1127 GNUNET_SERVER_add_handlers (server, handlers);
1128 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1129 &cleanup_task, cls);
1133 * The main function for the dns service.
1135 * @param argc number of arguments from the command line
1136 * @param argv command line arguments
1137 * @return 0 ok, 1 on error
1140 main (int argc, char *const *argv)
1142 return (GNUNET_OK ==
1143 GNUNET_SERVICE_run (argc,
1146 GNUNET_SERVICE_OPTION_NONE,
1147 &run, NULL)) ? 0 : 1;