read the dns-config from the file
[oweals/gnunet.git] / src / vpn / gnunet-service-dns.c
1 /*
2      This file is part of GNUnet.
3      (C) 2009 Christian Grothoff (and other contributing authors)
4
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.
9
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.
14
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.
19 */
20
21 /**
22  * @file vpn/gnunet-service-dns.c
23  * @author Philipp Toelke
24  */
25 #include "platform.h"
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"
41
42 /**
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.
45  */
46 static struct GNUNET_NETWORK_Handle *dnsout;
47
48 /**
49  * The port bound to the socket dnsout
50  */
51 static unsigned short dnsoutport;
52
53 /**
54  * A handle to the DHT-Service
55  */
56 static struct GNUNET_DHT_Handle *dht;
57
58 /**
59  * The configuration to use
60  */
61 static const struct GNUNET_CONFIGURATION_Handle *cfg;
62
63 /**
64  * The handle to the service-configuration
65  */
66 static struct GNUNET_CONFIGURATION_Handle *servicecfg;
67
68 /**
69  * A list of DNS-Responses that have to be sent to the requesting client
70  */
71 static struct answer_packet_list *head;
72
73 /**
74  * The tail of the list of DNS-responses
75  */
76 static struct answer_packet_list *tail;
77
78 /**
79  * A structure containing a mapping from network-byte-ordered DNS-id to
80  * some information needed to handle this query
81  *
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.
86  */
87 static struct {
88     unsigned valid:1;
89     struct GNUNET_SERVER_Client* client;
90     unsigned local_ip:32;
91     unsigned remote_ip:32;
92     unsigned local_port:16;
93     char* name;
94     unsigned namelen:8;
95 } query_states[65536];
96
97 /**
98  * A struct used to give more than one value as
99  * closure to receive_dht
100  */
101 struct receive_dht_cls {
102     unsigned short id;
103     struct GNUNET_DHT_GetHandle* handle;
104 };
105
106 /**
107  * Hijack all outgoing DNS-Traffic but for traffic leaving "our" port.
108  */
109 static void
110 hijack (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
111 {
112   char port_s[6];
113   char *virt_dns;
114   struct GNUNET_OS_Process *proc;
115
116   if (GNUNET_SYSERR ==
117       GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
118                                              &virt_dns))
119     {
120       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
121                   "No entry 'VIRTDNS' in configuration!\n");
122       exit (1);
123     }
124
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,
128                                                NULL,
129                                                "gnunet-helper-hijack-dns",
130                                                "gnunet-hijack-dns",
131                                                port_s, virt_dns, NULL)))
132     GNUNET_OS_process_close (proc);
133   GNUNET_free (virt_dns);
134 }
135
136 /**
137  * Delete the hijacking-routes
138  */
139 static void
140 unhijack (unsigned short port)
141 {
142   char port_s[6];
143   char *virt_dns;
144   struct GNUNET_OS_Process *proc;
145
146   if (GNUNET_SYSERR ==
147       GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
148                                              &virt_dns))
149     {
150       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
151                   "No entry 'VIRTDNS' in configuration!\n");
152       exit (1);
153     }
154
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,
158                                                NULL,
159                                                "gnunet-helper-hijack-dns",
160                                                "gnunet-hijack-dns",
161                                                "-d", port_s, virt_dns, NULL)))
162     GNUNET_OS_process_close (proc);
163   GNUNET_free (virt_dns);
164 }
165
166 /**
167  * Send the DNS-Response to the client. Gets called via the notify_transmit_ready-
168  * system.
169  */
170 static size_t
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);
174
175     GNUNET_assert(len <= size);
176
177     memcpy(buf, &query->pkt.hdr, len);
178
179     GNUNET_CONTAINER_DLL_remove (head, tail, query);
180
181     GNUNET_free(query);
182
183     /* When more data is to be sent, reschedule */
184     if (head != NULL)
185       GNUNET_SERVER_notify_transmit_ready(cls,
186                                           ntohs(head->pkt.hdr.size),
187                                           GNUNET_TIME_UNIT_FOREVER_REL,
188                                           &send_answer,
189                                           cls);
190
191     return len;
192 }
193
194 static void
195 send_rev_query(void * cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
196     struct dns_pkt_parsed* pdns = (struct dns_pkt_parsed*) cls;
197
198     unsigned short id = pdns->s.id;
199
200     if (query_states[id].valid != GNUNET_YES) return;
201     query_states[id].valid = GNUNET_NO;
202
203     GNUNET_assert(query_states[id].namelen == 74);
204
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... */ ;
213
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*));
216
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;
220
221     answer->pkt.from = query_states[id].remote_ip;
222
223     answer->pkt.to = query_states[id].local_ip;
224     answer->pkt.dst_port = query_states[id].local_port;
225
226     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
227
228     dpkt->s.id = id;
229     dpkt->s.aa = 1;
230     dpkt->s.qr = 1;
231     dpkt->s.ra = 1;
232     dpkt->s.qdcount = htons(1);
233     dpkt->s.ancount = htons(1);
234
235     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
236     GNUNET_free(query_states[id].name);
237
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 */
241
242     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
243     memcpy(anname, (char[]){0xc0, 0x0c}, 2);
244
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 */
249
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)));
253
254     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
255
256     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
257                                         len,
258                                         GNUNET_TIME_UNIT_FOREVER_REL,
259                                         &send_answer,
260                                         query_states[id].client);
261
262     /*
263      * build
264      * complete dns-packet with empty name in the answer
265      * provide offsett of the name
266      */
267 }
268
269 /**
270  * Receive a block from the dht.
271  */
272 static void
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,
279             size_t size,
280             const void *data) {
281
282     unsigned short id = ((struct receive_dht_cls*)cls)->id;
283     struct GNUNET_DHT_GetHandle* handle = ((struct receive_dht_cls*)cls)->handle;
284     GNUNET_free(cls);
285
286     GNUNET_assert(type == GNUNET_BLOCK_TYPE_DNS);
287
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;
291
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",
295                size,
296                *((unsigned int*)&rec->peer),
297                *((unsigned int*)&rec->service_descriptor));
298
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 */
306
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*));
309
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;
313
314     GNUNET_CRYPTO_hash(&rec->peer,
315                        sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
316                        &answer->pkt.service_descr.peer);
317
318     memcpy(&answer->pkt.service_descr.service_descriptor,
319            &rec->service_descriptor,
320            sizeof(GNUNET_HashCode));
321     memcpy(&answer->pkt.service_descr.service_type,
322            &rec->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));
325
326     answer->pkt.from = query_states[id].remote_ip;
327
328     answer->pkt.to = query_states[id].local_ip;
329     answer->pkt.dst_port = query_states[id].local_port;
330
331     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
332
333     dpkt->s.id = id;
334     dpkt->s.aa = 1;
335     dpkt->s.qr = 1;
336     dpkt->s.ra = 1;
337     dpkt->s.qdcount = htons(1);
338     dpkt->s.ancount = htons(1);
339
340     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
341     GNUNET_free(query_states[id].name);
342
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 */
346
347     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
348     memcpy(anname, (char[]){0xc0, 0x0c}, 2);
349
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);
355
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)));
359
360     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
361
362     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
363                                         len,
364                                         GNUNET_TIME_UNIT_FOREVER_REL,
365                                         &send_answer,
366                                         query_states[id].client);
367
368     GNUNET_DHT_get_stop(handle);
369 }
370
371 /**
372  * This receives a GNUNET_MESSAGE_TYPE_REHIJACK and rehijacks the DNS
373  */
374 static void
375 rehijack(void *cls,
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);
380
381     GNUNET_SERVER_receive_done(client, GNUNET_OK);
382 }
383
384 /**
385  * This receives the dns-payload from the daemon-vpn and sends it on over the udp-socket
386  */
387 static void
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);
394
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);
403
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))
407       {
408         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for .gnunet!\n");
409         GNUNET_HashCode key;
410         GNUNET_CRYPTO_hash(pdns->queries[0]->name, pdns->queries[0]->namelen, &key);
411
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);
416
417         struct receive_dht_cls* cls = GNUNET_malloc(sizeof(struct receive_dht_cls));
418         cls->id = dns->s.id;
419
420         cls->handle = GNUNET_DHT_get_start(dht,
421                                            GNUNET_TIME_UNIT_MINUTES,
422                                            GNUNET_BLOCK_TYPE_DNS,
423                                            &key,
424                                            DEFAULT_GET_REPLICATION,
425                                            GNUNET_DHT_RO_NONE,
426                                            NULL,
427                                            0,
428                                            NULL,
429                                            0,
430                                            receive_dht,
431                                            cls);
432
433         goto outfree;
434       }
435
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)
440       {
441         char* ipv6addr;
442         char ipv6[16];
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.";
444         unsigned int i;
445         unsigned long long ipv6prefix;
446         unsigned int comparelen;
447
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);
451
452         GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "vpn", "IPV6PREFIX", &ipv6prefix));
453         GNUNET_assert(ipv6prefix < 127);
454         ipv6prefix = (ipv6prefix + 7)/8;
455
456         for (i = ipv6prefix; i < 16; i++)
457           ipv6[i] = 0;
458
459         for (i = 0; i < 16; i++)
460           {
461             unsigned char c1 = ipv6[i] >> 4;
462             unsigned char c2 = ipv6[i] & 0xf;
463
464             if (c1 <= 9)
465               ipv6rev[62-(4*i)] = c1 + '0';
466             else
467               ipv6rev[62-(4*i)] = c1 + 87; /* 87 is the difference between 'a' and 10 */
468
469             if (c2 <= 9)
470               ipv6rev[62-((4*i)+2)] = c2 + '0';
471             else
472               ipv6rev[62-((4*i)+2)] = c2 + 87;
473           }
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),
478                         comparelen))
479           {
480             GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Reverse-Query for .gnunet!\n");
481
482             GNUNET_SCHEDULER_add_now(send_rev_query, pdns);
483
484             goto out;
485           }
486       }
487
488     /* The query should be sent to the network */
489
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;
494
495     GNUNET_NETWORK_socket_sendto(dnsout,
496                                  dns,
497                                  ntohs(pkt->hdr.size) - sizeof(struct query_packet) + 1,
498                                  (struct sockaddr*) &dest,
499                                  sizeof dest);
500
501 outfree:
502     free_parsed_dns_packet(pdns);
503     pdns = NULL;
504 out:
505     GNUNET_SERVER_receive_done(client, GNUNET_OK);
506 }
507
508 /**
509  * Read a response-packet of the UDP-Socket
510  */
511 static void
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;
515
516     if (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
517       return;
518
519     struct sockaddr_in addr;
520     memset(&addr, 0, sizeof addr);
521     socklen_t addrlen = sizeof addr;
522
523     int r;
524     r = GNUNET_NETWORK_socket_recvfrom(dnsout,
525                                        buf,
526                                        65536,
527                                        (struct sockaddr*)&addr,
528                                        &addrlen);
529
530     /* if (r < 0) FIXME */
531
532     if (query_states[dns->s.id].valid == GNUNET_YES) {
533         query_states[dns->s.id].valid = GNUNET_NO;
534
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);
544
545         GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
546
547         GNUNET_SERVER_notify_transmit_ready(query_states[dns->s.id].client,
548                                             len,
549                                             GNUNET_TIME_UNIT_FOREVER_REL,
550                                             &send_answer,
551                                             query_states[dns->s.id].client);
552     }
553
554     GNUNET_SCHEDULER_add_read_net(GNUNET_TIME_UNIT_FOREVER_REL,
555                                   dnsout,
556                                   &read_response,
557                                   NULL);
558 }
559
560
561 /**
562  * Task run during shutdown.
563  *
564  * @param cls unused
565  * @param tc unused
566  */
567 static void
568 cleanup_task (void *cls,
569               const struct GNUNET_SCHEDULER_TaskContext *tc)
570 {
571   unhijack(dnsoutport);
572   GNUNET_DHT_disconnect(dht);
573 }
574
575 /**
576  * @brief Create a port-map from udp and tcp redirects
577  *
578  * @param udp_redirects
579  * @param tcp_redirects
580  *
581  * @return 
582  */
583 uint64_t
584 get_port_from_redirects (const char *udp_redirects, const char *tcp_redirects)
585 {
586   uint64_t ret = 0;
587   char* cpy, *hostname, *redirect;
588   int local_port, count = 0;
589
590   if (NULL != udp_redirects)
591     {
592       cpy = GNUNET_strdup (udp_redirects);
593       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
594         {
595           if (NULL == (hostname = strstr (redirect, ":")))
596             {
597               // FIXME: bitch
598               continue;
599             }
600           hostname[0] = '\0';
601           local_port = atoi (redirect);
602           GNUNET_assert ((local_port > 0) && (local_port < 65536)); // FIXME: don't crash!!!
603
604           ret |= (0xFFFF & htons(local_port));
605           ret <<= 16;
606           count ++;
607
608           if(count > 4)
609             {
610               ret = 0;
611               goto out;
612             }
613         }
614       GNUNET_free(cpy);
615       cpy = NULL;
616     }
617
618   if (NULL != tcp_redirects)
619     {
620       cpy = GNUNET_strdup (tcp_redirects);
621       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
622         {
623           if (NULL == (hostname = strstr (redirect, ":")))
624             {
625               // FIXME: bitch
626               continue;
627             }
628           hostname[0] = '\0';
629           local_port = atoi (redirect);
630           GNUNET_assert ((local_port > 0) && (local_port < 65536)); // FIXME: don't crash!!!
631
632           ret |= (0xFFFF & htons(local_port));
633           ret <<= 16;
634           count ++;
635
636           if(count > 4)
637             {
638               ret = 0;
639               goto out;
640             }
641         }
642       GNUNET_free(cpy);
643       cpy = NULL;
644     }
645
646 out:
647   if (NULL != cpy)
648     GNUNET_free(cpy);
649   return ret;
650 }
651
652 void
653 publish_name (const char *name, uint64_t ports, uint32_t service_type,
654               struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key)
655 {
656   size_t size = sizeof (struct GNUNET_DNS_Record);
657   struct GNUNET_DNS_Record data;
658   memset (&data, 0, size);
659
660   data.purpose.size =
661     htonl (size - sizeof (struct GNUNET_CRYPTO_RsaSignature));
662   data.purpose.purpose = GNUNET_SIGNATURE_PURPOSE_DNS_RECORD;
663
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));
667
668   data.service_type = service_type;
669   data.ports = ports;
670
671   GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &data.peer);
672
673   data.expiration_time =
674     GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_HOURS, 2));
675
676   /* Sign the block */
677   if (GNUNET_OK != GNUNET_CRYPTO_rsa_sign (my_private_key,
678                                            &data.purpose, &data.signature))
679     {
680       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not sign DNS_Record\n");
681       return;
682     }
683
684   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
685               "Putting with key %08x, size = %d\n",
686               *((unsigned int *) &data.service_descriptor), size);
687
688   GNUNET_DHT_put (dht,
689                   &data.service_descriptor,
690                   DEFAULT_PUT_REPLICATION,
691                   GNUNET_DHT_RO_NONE,
692                   GNUNET_BLOCK_TYPE_DNS,
693                   size,
694                   (char *) &data,
695                   GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_HOURS),
696                   GNUNET_TIME_UNIT_MINUTES, NULL, NULL);
697 }
698
699 /**
700  * @brief Publishes the record defined by the section section
701  *
702  * @param cls closure
703  * @param section the current section
704  */
705 void
706 publish_iterate (void *cls, const char *section)
707 {
708   char *udp_redirects, *tcp_redirects, *alternative_names, *alternative_name,
709     *keyfile;
710
711   GNUNET_CONFIGURATION_get_value_string (servicecfg, section,
712                                          "UDP_REDIRECTS", &udp_redirects);
713   GNUNET_CONFIGURATION_get_value_string (servicecfg, section, "TCP_REDIRECTS",
714                                          &tcp_redirects);
715
716   if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "GNUNETD",
717                                                             "HOSTKEY",
718                                                             &keyfile))
719     {
720       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not read keyfile-value\n");
721       if (keyfile != NULL)
722         GNUNET_free (keyfile);
723       return;
724     }
725
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);
730
731   uint64_t ports = get_port_from_redirects (udp_redirects, tcp_redirects);
732   uint32_t service_type = 0;
733
734   if (NULL != udp_redirects)
735     service_type = GNUNET_DNS_SERVICE_TYPE_UDP;
736
737   if (NULL != tcp_redirects)
738     service_type = GNUNET_DNS_SERVICE_TYPE_TCP;
739
740   service_type = htonl (service_type);
741
742
743   publish_name (section, ports, service_type, my_private_key);
744
745   GNUNET_CONFIGURATION_get_value_string (servicecfg, section,
746                                          "ALTERNATIVE_NAMES",
747                                          &alternative_names);
748   for (alternative_name = strtok (alternative_names, " ");
749        alternative_name != NULL; alternative_name = strtok (NULL, " "))
750     {
751       char *altname =
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)] = '.';
756
757       publish_name (altname, ports, service_type, my_private_key);
758     }
759
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);
764 }
765
766 /**
767  * Publish a DNS-record in the DHT. This is up to now just for testing.
768  */
769 static void
770 publish_names (void *cls,
771                const struct GNUNET_SCHEDULER_TaskContext *tc) {
772     char *services;
773     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
774       return;
775
776     if (NULL != servicecfg)
777       GNUNET_CONFIGURATION_destroy(servicecfg);
778
779     GNUNET_CONFIGURATION_get_value_filename(cfg, "dns", "SERVICES", &services);
780
781     servicecfg = GNUNET_CONFIGURATION_create();
782     if (GNUNET_OK == GNUNET_CONFIGURATION_parse(servicecfg, services))
783       {
784         GNUNET_log(GNUNET_ERROR_TYPE_INFO, "Parsing services %s\n", services);
785         GNUNET_CONFIGURATION_iterate_sections(servicecfg, publish_iterate, NULL);
786       }
787     if (NULL != services)
788       GNUNET_free(services);
789
790     GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_HOURS,
791                                   publish_names,
792                                   NULL);
793 }
794
795 /**
796  * @param cls closure
797  * @param server the initialized server
798  * @param cfg_ configuration to use
799  */
800 static void
801 run (void *cls,
802      struct GNUNET_SERVER_Handle *server,
803      const struct GNUNET_CONFIGURATION_Handle *cfg_)
804 {
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)},
809         {NULL, NULL, 0, 0}
810   };
811
812   cfg = cfg_;
813
814   unsigned int i;
815   for (i = 0; i < 65536; i++) {
816       query_states[i].valid = GNUNET_NO;
817   }
818
819   dht = GNUNET_DHT_connect(cfg, 1024);
820
821   struct sockaddr_in addr;
822
823   dnsout = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0);
824   if (dnsout == NULL)
825     return;
826   memset(&addr, 0, sizeof(struct sockaddr_in));
827
828   int err = GNUNET_NETWORK_socket_bind (dnsout,
829                                         (struct sockaddr*)&addr,
830                                         sizeof(struct sockaddr_in));
831
832   if (err != GNUNET_YES) {
833       GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Could not bind a port, exiting\n");
834       return;
835   }
836
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,
841                     &addrlen);
842
843   dnsoutport = htons(addr.sin_port);
844
845   GNUNET_SCHEDULER_add_now (publish_names, NULL);
846
847   GNUNET_SCHEDULER_add_read_net(GNUNET_TIME_UNIT_FOREVER_REL, dnsout, &read_response, NULL);
848
849   GNUNET_SERVER_add_handlers (server, handlers);
850   GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
851                                 &cleanup_task,
852                                 cls);
853 }
854
855 /**
856  * The main function for the dns service.
857  *
858  * @param argc number of arguments from the command line
859  * @param argv command line arguments
860  * @return 0 ok, 1 on error
861  */
862 int
863 main (int argc, char *const *argv)
864 {
865   return (GNUNET_OK ==
866           GNUNET_SERVICE_run (argc,
867                               argv,
868                               "dns",
869                               GNUNET_SERVICE_OPTION_NONE,
870                               &run, NULL)) ? 0 : 1;
871 }