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Commit | Line | Data |
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f6b7dc47 | 1 | /* dnsmasq is Copyright (c) 2000 - 2005 Simon Kelley |
9e4abcb5 SK |
2 | |
3 | This program is free software; you can redistribute it and/or modify | |
4 | it under the terms of the GNU General Public License as published by | |
5 | the Free Software Foundation; version 2 dated June, 1991. | |
6 | ||
7 | This program is distributed in the hope that it will be useful, | |
8 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
9 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10 | GNU General Public License for more details. | |
11 | */ | |
12 | ||
9e4abcb5 SK |
13 | #include "dnsmasq.h" |
14 | ||
849a8357 | 15 | static struct frec *frec_list = NULL; |
9e4abcb5 | 16 | |
832af0ba | 17 | static struct frec *lookup_frec(unsigned short id, unsigned int crc); |
9e4abcb5 | 18 | static struct frec *lookup_frec_by_sender(unsigned short id, |
fd9fa481 SK |
19 | union mysockaddr *addr, |
20 | unsigned int crc); | |
832af0ba | 21 | static unsigned short get_id(int force, unsigned short force_id, unsigned int crc); |
9e4abcb5 | 22 | |
9e4abcb5 | 23 | |
44a2a316 SK |
24 | /* Send a UDP packet with it's source address set as "source" |
25 | unless nowild is true, when we just send it with the kernel default */ | |
cdeda28f | 26 | static void send_from(int fd, int nowild, char *packet, size_t len, |
dfa666f2 SK |
27 | union mysockaddr *to, struct all_addr *source, |
28 | unsigned int iface) | |
9e4abcb5 | 29 | { |
44a2a316 SK |
30 | struct msghdr msg; |
31 | struct iovec iov[1]; | |
44a2a316 SK |
32 | union { |
33 | struct cmsghdr align; /* this ensures alignment */ | |
5e9e0efb | 34 | #if defined(HAVE_LINUX_NETWORK) |
44a2a316 SK |
35 | char control[CMSG_SPACE(sizeof(struct in_pktinfo))]; |
36 | #elif defined(IP_SENDSRCADDR) | |
37 | char control[CMSG_SPACE(sizeof(struct in_addr))]; | |
38 | #endif | |
39 | #ifdef HAVE_IPV6 | |
40 | char control6[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
41 | #endif | |
42 | } control_u; | |
feba5c1d | 43 | |
44a2a316 SK |
44 | iov[0].iov_base = packet; |
45 | iov[0].iov_len = len; | |
46 | ||
feba5c1d SK |
47 | msg.msg_control = NULL; |
48 | msg.msg_controllen = 0; | |
44a2a316 SK |
49 | msg.msg_flags = 0; |
50 | msg.msg_name = to; | |
51 | msg.msg_namelen = sa_len(to); | |
52 | msg.msg_iov = iov; | |
53 | msg.msg_iovlen = 1; | |
feba5c1d | 54 | |
26128d27 | 55 | if (!nowild) |
44a2a316 | 56 | { |
26128d27 | 57 | struct cmsghdr *cmptr; |
feba5c1d SK |
58 | msg.msg_control = &control_u; |
59 | msg.msg_controllen = sizeof(control_u); | |
26128d27 SK |
60 | cmptr = CMSG_FIRSTHDR(&msg); |
61 | ||
62 | if (to->sa.sa_family == AF_INET) | |
63 | { | |
5e9e0efb | 64 | #if defined(HAVE_LINUX_NETWORK) |
26128d27 SK |
65 | struct in_pktinfo *pkt = (struct in_pktinfo *)CMSG_DATA(cmptr); |
66 | pkt->ipi_ifindex = 0; | |
67 | pkt->ipi_spec_dst = source->addr.addr4; | |
68 | msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
69 | cmptr->cmsg_level = SOL_IP; | |
70 | cmptr->cmsg_type = IP_PKTINFO; | |
44a2a316 | 71 | #elif defined(IP_SENDSRCADDR) |
26128d27 SK |
72 | struct in_addr *a = (struct in_addr *)CMSG_DATA(cmptr); |
73 | *a = source->addr.addr4; | |
74 | msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_addr)); | |
75 | cmptr->cmsg_level = IPPROTO_IP; | |
76 | cmptr->cmsg_type = IP_SENDSRCADDR; | |
44a2a316 | 77 | #endif |
26128d27 | 78 | } |
26128d27 | 79 | else |
b8187c80 | 80 | #ifdef HAVE_IPV6 |
26128d27 SK |
81 | { |
82 | struct in6_pktinfo *pkt = (struct in6_pktinfo *)CMSG_DATA(cmptr); | |
83 | pkt->ipi6_ifindex = iface; /* Need iface for IPv6 to handle link-local addrs */ | |
84 | pkt->ipi6_addr = source->addr.addr6; | |
85 | msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); | |
86 | cmptr->cmsg_type = IPV6_PKTINFO; | |
87 | cmptr->cmsg_level = IPV6_LEVEL; | |
88 | } | |
3d8df260 SK |
89 | #else |
90 | iface = 0; /* eliminate warning */ | |
44a2a316 | 91 | #endif |
26128d27 | 92 | } |
feba5c1d | 93 | |
fd9fa481 SK |
94 | retry: |
95 | if (sendmsg(fd, &msg, 0) == -1) | |
feba5c1d | 96 | { |
fd9fa481 SK |
97 | /* certain Linux kernels seem to object to setting the source address in the IPv6 stack |
98 | by returning EINVAL from sendmsg. In that case, try again without setting the | |
99 | source address, since it will nearly alway be correct anyway. IPv6 stinks. */ | |
100 | if (errno == EINVAL && msg.msg_controllen) | |
101 | { | |
102 | msg.msg_controllen = 0; | |
103 | goto retry; | |
104 | } | |
105 | if (retry_send()) | |
106 | goto retry; | |
feba5c1d | 107 | } |
9e4abcb5 | 108 | } |
44a2a316 | 109 | |
36717eee SK |
110 | static unsigned short search_servers(struct daemon *daemon, time_t now, struct all_addr **addrpp, |
111 | unsigned short qtype, char *qdomain, int *type, char **domain) | |
feba5c1d SK |
112 | |
113 | { | |
114 | /* If the query ends in the domain in one of our servers, set | |
115 | domain to point to that name. We find the largest match to allow both | |
116 | domain.org and sub.domain.org to exist. */ | |
117 | ||
118 | unsigned int namelen = strlen(qdomain); | |
119 | unsigned int matchlen = 0; | |
120 | struct server *serv; | |
121 | unsigned short flags = 0; | |
122 | ||
3be34541 | 123 | for (serv = daemon->servers; serv; serv=serv->next) |
feba5c1d | 124 | /* domain matches take priority over NODOTS matches */ |
3d8df260 | 125 | if ((serv->flags & SERV_FOR_NODOTS) && *type != SERV_HAS_DOMAIN && !strchr(qdomain, '.') && namelen != 0) |
feba5c1d SK |
126 | { |
127 | unsigned short sflag = serv->addr.sa.sa_family == AF_INET ? F_IPV4 : F_IPV6; | |
128 | *type = SERV_FOR_NODOTS; | |
feba5c1d | 129 | if (serv->flags & SERV_NO_ADDR) |
36717eee SK |
130 | flags = F_NXDOMAIN; |
131 | else if (serv->flags & SERV_LITERAL_ADDRESS) | |
132 | { | |
133 | if (sflag & qtype) | |
134 | { | |
135 | flags = sflag; | |
136 | if (serv->addr.sa.sa_family == AF_INET) | |
137 | *addrpp = (struct all_addr *)&serv->addr.in.sin_addr; | |
feba5c1d | 138 | #ifdef HAVE_IPV6 |
36717eee SK |
139 | else |
140 | *addrpp = (struct all_addr *)&serv->addr.in6.sin6_addr; | |
feba5c1d | 141 | #endif |
36717eee SK |
142 | } |
143 | else if (!flags) | |
144 | flags = F_NOERR; | |
145 | } | |
feba5c1d SK |
146 | } |
147 | else if (serv->flags & SERV_HAS_DOMAIN) | |
148 | { | |
149 | unsigned int domainlen = strlen(serv->domain); | |
b8187c80 | 150 | char *matchstart = qdomain + namelen - domainlen; |
feba5c1d | 151 | if (namelen >= domainlen && |
b8187c80 SK |
152 | hostname_isequal(matchstart, serv->domain) && |
153 | domainlen >= matchlen && | |
cdeda28f | 154 | (domainlen == 0 || namelen == domainlen || *(serv->domain) == '.' || *(matchstart-1) == '.' )) |
feba5c1d SK |
155 | { |
156 | unsigned short sflag = serv->addr.sa.sa_family == AF_INET ? F_IPV4 : F_IPV6; | |
157 | *type = SERV_HAS_DOMAIN; | |
158 | *domain = serv->domain; | |
159 | matchlen = domainlen; | |
feba5c1d | 160 | if (serv->flags & SERV_NO_ADDR) |
36717eee SK |
161 | flags = F_NXDOMAIN; |
162 | else if (serv->flags & SERV_LITERAL_ADDRESS) | |
feba5c1d | 163 | { |
36717eee SK |
164 | if ((sflag | F_QUERY ) & qtype) |
165 | { | |
832af0ba | 166 | flags = qtype & ~F_BIGNAME; |
36717eee SK |
167 | if (serv->addr.sa.sa_family == AF_INET) |
168 | *addrpp = (struct all_addr *)&serv->addr.in.sin_addr; | |
feba5c1d | 169 | #ifdef HAVE_IPV6 |
36717eee SK |
170 | else |
171 | *addrpp = (struct all_addr *)&serv->addr.in6.sin6_addr; | |
feba5c1d | 172 | #endif |
36717eee SK |
173 | } |
174 | else if (!flags) | |
175 | flags = F_NOERR; | |
feba5c1d SK |
176 | } |
177 | } | |
178 | } | |
179 | ||
36717eee | 180 | if (flags & ~(F_NOERR | F_NXDOMAIN)) /* flags set here means a literal found */ |
feba5c1d SK |
181 | { |
182 | if (flags & F_QUERY) | |
fd9fa481 | 183 | log_query(F_CONFIG | F_FORWARD | F_NEG, qdomain, NULL, 0, NULL, 0); |
feba5c1d | 184 | else |
fd9fa481 | 185 | log_query(F_CONFIG | F_FORWARD | flags, qdomain, *addrpp, 0, NULL, 0); |
feba5c1d | 186 | } |
832af0ba SK |
187 | else if (qtype && !(qtype & F_BIGNAME) && |
188 | (daemon->options & OPT_NODOTS_LOCAL) && !strchr(qdomain, '.') && namelen != 0) | |
189 | /* don't forward simple names, make exception from NS queries and empty name. */ | |
36717eee SK |
190 | flags = F_NXDOMAIN; |
191 | ||
f6b7dc47 | 192 | if (flags == F_NXDOMAIN && check_for_local_domain(qdomain, now, daemon)) |
c1bb8504 | 193 | flags = F_NOERR; |
feba5c1d | 194 | |
36717eee | 195 | if (flags == F_NXDOMAIN || flags == F_NOERR) |
fd9fa481 | 196 | log_query(F_CONFIG | F_FORWARD | F_NEG | qtype | (flags & F_NXDOMAIN), qdomain, NULL, 0, NULL, 0); |
feba5c1d SK |
197 | |
198 | return flags; | |
199 | } | |
44a2a316 | 200 | |
9e4abcb5 | 201 | /* returns new last_server */ |
3be34541 SK |
202 | static void forward_query(struct daemon *daemon, int udpfd, union mysockaddr *udpaddr, |
203 | struct all_addr *dst_addr, unsigned int dst_iface, | |
cdeda28f | 204 | HEADER *header, size_t plen, time_t now, struct frec *forward) |
9e4abcb5 | 205 | { |
9e4abcb5 | 206 | char *domain = NULL; |
0a852541 | 207 | int type = 0; |
9e4abcb5 | 208 | struct all_addr *addrp = NULL; |
cdeda28f | 209 | unsigned int crc = questions_crc(header, plen, daemon->namebuff); |
9e4abcb5 | 210 | unsigned short flags = 0; |
cdeda28f | 211 | unsigned short gotname = extract_request(header, plen, daemon->namebuff, NULL); |
de37951c | 212 | struct server *start = NULL; |
3d8df260 SK |
213 | |
214 | /* may be no servers available. */ | |
215 | if (!daemon->servers) | |
9e4abcb5 | 216 | forward = NULL; |
b8187c80 | 217 | else if (forward || (forward = lookup_frec_by_sender(ntohs(header->id), udpaddr, crc))) |
9e4abcb5 | 218 | { |
de37951c | 219 | /* retry on existing query, send to all available servers */ |
9e4abcb5 | 220 | domain = forward->sentto->domain; |
3be34541 | 221 | if (!(daemon->options & OPT_ORDER)) |
de37951c | 222 | { |
0a852541 | 223 | forward->forwardall = 1; |
3be34541 | 224 | daemon->last_server = NULL; |
de37951c | 225 | } |
9e4abcb5 | 226 | type = forward->sentto->flags & SERV_TYPE; |
de37951c | 227 | if (!(start = forward->sentto->next)) |
3be34541 | 228 | start = daemon->servers; /* at end of list, recycle */ |
9e4abcb5 SK |
229 | header->id = htons(forward->new_id); |
230 | } | |
231 | else | |
232 | { | |
233 | if (gotname) | |
36717eee | 234 | flags = search_servers(daemon, now, &addrp, gotname, daemon->namebuff, &type, &domain); |
9e4abcb5 | 235 | |
1697269c | 236 | if (!flags && !(forward = get_new_frec(daemon, now, NULL))) |
feba5c1d SK |
237 | /* table full - server failure. */ |
238 | flags = F_NEG; | |
9e4abcb5 SK |
239 | |
240 | if (forward) | |
241 | { | |
832af0ba SK |
242 | /* force unchanging id for signed packets */ |
243 | int is_sign; | |
244 | find_pseudoheader(header, plen, NULL, NULL, &is_sign); | |
245 | ||
0a852541 SK |
246 | forward->source = *udpaddr; |
247 | forward->dest = *dst_addr; | |
248 | forward->iface = dst_iface; | |
0a852541 | 249 | forward->orig_id = ntohs(header->id); |
832af0ba SK |
250 | forward->new_id = get_id(is_sign, forward->orig_id, crc); |
251 | forward->fd = udpfd; | |
0a852541 SK |
252 | forward->crc = crc; |
253 | forward->forwardall = 0; | |
254 | header->id = htons(forward->new_id); | |
255 | ||
9e4abcb5 SK |
256 | /* In strict_order mode, or when using domain specific servers |
257 | always try servers in the order specified in resolv.conf, | |
258 | otherwise, use the one last known to work. */ | |
259 | ||
3be34541 SK |
260 | if (type != 0 || (daemon->options & OPT_ORDER)) |
261 | start = daemon->servers; | |
262 | else if (!(start = daemon->last_server)) | |
de37951c | 263 | { |
3be34541 | 264 | start = daemon->servers; |
0a852541 | 265 | forward->forwardall = 1; |
de37951c | 266 | } |
9e4abcb5 SK |
267 | } |
268 | } | |
feba5c1d | 269 | |
9e4abcb5 SK |
270 | /* check for send errors here (no route to host) |
271 | if we fail to send to all nameservers, send back an error | |
272 | packet straight away (helps modem users when offline) */ | |
273 | ||
274 | if (!flags && forward) | |
275 | { | |
de37951c SK |
276 | struct server *firstsentto = start; |
277 | int forwarded = 0; | |
278 | ||
9e4abcb5 SK |
279 | while (1) |
280 | { | |
9e4abcb5 SK |
281 | /* only send to servers dealing with our domain. |
282 | domain may be NULL, in which case server->domain | |
283 | must be NULL also. */ | |
284 | ||
de37951c | 285 | if (type == (start->flags & SERV_TYPE) && |
fd9fa481 SK |
286 | (type != SERV_HAS_DOMAIN || hostname_isequal(domain, start->domain)) && |
287 | !(start->flags & SERV_LITERAL_ADDRESS)) | |
9e4abcb5 | 288 | { |
fd9fa481 | 289 | if (sendto(start->sfd->fd, (char *)header, plen, 0, |
feba5c1d | 290 | &start->addr.sa, |
fd9fa481 SK |
291 | sa_len(&start->addr)) == -1) |
292 | { | |
293 | if (retry_send()) | |
294 | continue; | |
295 | } | |
296 | else | |
9e4abcb5 | 297 | { |
cdeda28f SK |
298 | /* Keep info in case we want to re-send this packet */ |
299 | daemon->srv_save = start; | |
300 | daemon->packet_len = plen; | |
301 | ||
de37951c | 302 | if (!gotname) |
3be34541 | 303 | strcpy(daemon->namebuff, "query"); |
de37951c | 304 | if (start->addr.sa.sa_family == AF_INET) |
3be34541 | 305 | log_query(F_SERVER | F_IPV4 | F_FORWARD, daemon->namebuff, |
fd9fa481 SK |
306 | (struct all_addr *)&start->addr.in.sin_addr, 0, |
307 | NULL, 0); | |
de37951c SK |
308 | #ifdef HAVE_IPV6 |
309 | else | |
3be34541 | 310 | log_query(F_SERVER | F_IPV6 | F_FORWARD, daemon->namebuff, |
fd9fa481 SK |
311 | (struct all_addr *)&start->addr.in6.sin6_addr, 0, |
312 | NULL, 0); | |
de37951c SK |
313 | #endif |
314 | forwarded = 1; | |
315 | forward->sentto = start; | |
0a852541 | 316 | if (!forward->forwardall) |
de37951c | 317 | break; |
0a852541 | 318 | forward->forwardall++; |
9e4abcb5 SK |
319 | } |
320 | } | |
321 | ||
de37951c | 322 | if (!(start = start->next)) |
3be34541 | 323 | start = daemon->servers; |
9e4abcb5 | 324 | |
de37951c | 325 | if (start == firstsentto) |
9e4abcb5 SK |
326 | break; |
327 | } | |
328 | ||
de37951c | 329 | if (forwarded) |
3be34541 | 330 | return; |
de37951c | 331 | |
9e4abcb5 SK |
332 | /* could not send on, prepare to return */ |
333 | header->id = htons(forward->orig_id); | |
832af0ba | 334 | forward->sentto = NULL; /* cancel */ |
9e4abcb5 SK |
335 | } |
336 | ||
337 | /* could not send on, return empty answer or address if known for whole domain */ | |
b8187c80 SK |
338 | if (udpfd != -1) |
339 | { | |
cdeda28f | 340 | plen = setup_reply(header, plen, addrp, flags, daemon->local_ttl); |
b8187c80 SK |
341 | send_from(udpfd, daemon->options & OPT_NOWILD, (char *)header, plen, udpaddr, dst_addr, dst_iface); |
342 | } | |
343 | ||
3be34541 | 344 | return; |
9e4abcb5 SK |
345 | } |
346 | ||
cdeda28f | 347 | static size_t process_reply(struct daemon *daemon, HEADER *header, time_t now, |
832af0ba | 348 | struct server *server, size_t n) |
feba5c1d | 349 | { |
36717eee | 350 | unsigned char *pheader, *sizep; |
832af0ba | 351 | int munged = 0, is_sign; |
cdeda28f SK |
352 | size_t plen; |
353 | ||
feba5c1d SK |
354 | /* If upstream is advertising a larger UDP packet size |
355 | than we allow, trim it so that we don't get overlarge | |
832af0ba | 356 | requests for the client. We can't do this for signed packets. */ |
feba5c1d | 357 | |
832af0ba | 358 | if ((pheader = find_pseudoheader(header, n, &plen, &sizep, &is_sign)) && !is_sign) |
feba5c1d SK |
359 | { |
360 | unsigned short udpsz; | |
36717eee | 361 | unsigned char *psave = sizep; |
feba5c1d | 362 | |
36717eee | 363 | GETSHORT(udpsz, sizep); |
3be34541 SK |
364 | if (udpsz > daemon->edns_pktsz) |
365 | PUTSHORT(daemon->edns_pktsz, psave); | |
feba5c1d SK |
366 | } |
367 | ||
1b7ecd11 | 368 | if (header->opcode != QUERY || (header->rcode != NOERROR && header->rcode != NXDOMAIN)) |
0a852541 SK |
369 | return n; |
370 | ||
feba5c1d | 371 | /* Complain loudly if the upstream server is non-recursive. */ |
0a852541 SK |
372 | if (!header->ra && header->rcode == NOERROR && ntohs(header->ancount) == 0 && |
373 | server && !(server->flags & SERV_WARNED_RECURSIVE)) | |
feba5c1d | 374 | { |
3d8df260 | 375 | prettyprint_addr(&server->addr, daemon->namebuff); |
b8187c80 | 376 | syslog(LOG_WARNING, _("nameserver %s refused to do a recursive query"), daemon->namebuff); |
0a852541 SK |
377 | if (!(daemon->options & OPT_LOG)) |
378 | server->flags |= SERV_WARNED_RECURSIVE; | |
379 | } | |
380 | ||
fd9fa481 SK |
381 | if (daemon->bogus_addr && header->rcode != NXDOMAIN && |
382 | check_for_bogus_wildcard(header, n, daemon->namebuff, daemon->bogus_addr, now)) | |
feba5c1d | 383 | { |
fd9fa481 SK |
384 | munged = 1; |
385 | header->rcode = NXDOMAIN; | |
386 | header->aa = 0; | |
36717eee | 387 | } |
fd9fa481 | 388 | else |
36717eee | 389 | { |
fd9fa481 SK |
390 | if (header->rcode == NXDOMAIN && |
391 | extract_request(header, n, daemon->namebuff, NULL) && | |
f6b7dc47 | 392 | check_for_local_domain(daemon->namebuff, now, daemon)) |
36717eee SK |
393 | { |
394 | /* if we forwarded a query for a locally known name (because it was for | |
395 | an unknown type) and the answer is NXDOMAIN, convert that to NODATA, | |
396 | since we know that the domain exists, even if upstream doesn't */ | |
fd9fa481 SK |
397 | munged = 1; |
398 | header->aa = 1; | |
399 | header->rcode = NOERROR; | |
feba5c1d | 400 | } |
832af0ba SK |
401 | |
402 | extract_addresses(header, n, daemon->namebuff, now, daemon); | |
feba5c1d | 403 | } |
fd9fa481 SK |
404 | |
405 | /* do this after extract_addresses. Ensure NODATA reply and remove | |
406 | nameserver info. */ | |
407 | ||
408 | if (munged) | |
409 | { | |
410 | header->ancount = htons(0); | |
411 | header->nscount = htons(0); | |
412 | header->arcount = htons(0); | |
413 | } | |
414 | ||
36717eee SK |
415 | /* the bogus-nxdomain stuff, doctor and NXDOMAIN->NODATA munging can all elide |
416 | sections of the packet. Find the new length here and put back pseudoheader | |
417 | if it was removed. */ | |
418 | return resize_packet(header, n, pheader, plen); | |
feba5c1d SK |
419 | } |
420 | ||
3be34541 SK |
421 | /* sets new last_server */ |
422 | void reply_query(struct serverfd *sfd, struct daemon *daemon, time_t now) | |
9e4abcb5 SK |
423 | { |
424 | /* packet from peer server, extract data for cache, and send to | |
425 | original requester */ | |
9e4abcb5 | 426 | HEADER *header; |
de37951c | 427 | union mysockaddr serveraddr; |
832af0ba | 428 | struct frec *forward; |
de37951c | 429 | socklen_t addrlen = sizeof(serveraddr); |
cdeda28f SK |
430 | ssize_t n = recvfrom(sfd->fd, daemon->packet, daemon->edns_pktsz, 0, &serveraddr.sa, &addrlen); |
431 | size_t nn; | |
432 | ||
433 | /* packet buffer overwritten */ | |
434 | daemon->srv_save = NULL; | |
832af0ba | 435 | |
de37951c SK |
436 | /* Determine the address of the server replying so that we can mark that as good */ |
437 | serveraddr.sa.sa_family = sfd->source_addr.sa.sa_family; | |
438 | #ifdef HAVE_IPV6 | |
439 | if (serveraddr.sa.sa_family == AF_INET6) | |
5e9e0efb | 440 | serveraddr.in6.sin6_flowinfo = 0; |
de37951c | 441 | #endif |
9e4abcb5 | 442 | |
3be34541 | 443 | header = (HEADER *)daemon->packet; |
fd9fa481 | 444 | |
832af0ba SK |
445 | if (n >= (int)sizeof(HEADER) && header->qr && |
446 | (forward = lookup_frec(ntohs(header->id), questions_crc(header, n, daemon->namebuff)))) | |
9e4abcb5 | 447 | { |
832af0ba SK |
448 | struct server *server = forward->sentto; |
449 | ||
6b01084f SK |
450 | if ((header->rcode == SERVFAIL || header->rcode == REFUSED) && |
451 | !(daemon->options & OPT_ORDER) && | |
452 | forward->forwardall == 0) | |
832af0ba SK |
453 | /* for broken servers, attempt to send to another one. */ |
454 | { | |
455 | unsigned char *pheader; | |
456 | size_t plen; | |
457 | int is_sign; | |
458 | ||
459 | /* recreate query from reply */ | |
460 | pheader = find_pseudoheader(header, (size_t)n, &plen, NULL, &is_sign); | |
461 | if (!is_sign) | |
462 | { | |
463 | header->ancount = htons(0); | |
464 | header->nscount = htons(0); | |
465 | header->arcount = htons(0); | |
466 | if ((nn = resize_packet(header, (size_t)n, pheader, plen))) | |
467 | { | |
468 | header->qr = 0; | |
469 | header->tc = 0; | |
470 | forward_query(daemon, -1, NULL, NULL, 0, header, nn, now, forward); | |
471 | return; | |
472 | } | |
473 | } | |
474 | } | |
475 | ||
476 | if ((forward->sentto->flags & SERV_TYPE) == 0) | |
477 | { | |
478 | if (header->rcode == SERVFAIL || header->rcode == REFUSED) | |
479 | server = NULL; | |
480 | else | |
481 | { | |
482 | struct server *last_server; | |
483 | /* find good server by address if possible, otherwise assume the last one we sent to */ | |
484 | for (last_server = daemon->servers; last_server; last_server = last_server->next) | |
485 | if (!(last_server->flags & (SERV_LITERAL_ADDRESS | SERV_HAS_DOMAIN | SERV_FOR_NODOTS | SERV_NO_ADDR)) && | |
486 | sockaddr_isequal(&last_server->addr, &serveraddr)) | |
487 | { | |
488 | server = last_server; | |
489 | break; | |
490 | } | |
491 | } | |
492 | daemon->last_server = server; | |
493 | } | |
494 | ||
0a852541 SK |
495 | /* If the answer is an error, keep the forward record in place in case |
496 | we get a good reply from another server. Kill it when we've | |
497 | had replies from all to avoid filling the forwarding table when | |
498 | everything is broken */ | |
499 | if (forward->forwardall == 0 || --forward->forwardall == 1 || | |
500 | (header->rcode != REFUSED && header->rcode != SERVFAIL)) | |
b8187c80 | 501 | { |
832af0ba | 502 | if ((nn = process_reply(daemon, header, now, server, (size_t)n))) |
b8187c80 SK |
503 | { |
504 | header->id = htons(forward->orig_id); | |
505 | header->ra = 1; /* recursion if available */ | |
cdeda28f | 506 | send_from(forward->fd, daemon->options & OPT_NOWILD, daemon->packet, nn, |
b8187c80 SK |
507 | &forward->source, &forward->dest, forward->iface); |
508 | } | |
832af0ba | 509 | forward->sentto = NULL; /* cancel */ |
b8187c80 | 510 | } |
9e4abcb5 | 511 | } |
9e4abcb5 | 512 | } |
44a2a316 | 513 | |
3be34541 | 514 | void receive_query(struct listener *listen, struct daemon *daemon, time_t now) |
44a2a316 | 515 | { |
3be34541 | 516 | HEADER *header = (HEADER *)daemon->packet; |
44a2a316 | 517 | union mysockaddr source_addr; |
c1bb8504 | 518 | unsigned short type; |
44a2a316 | 519 | struct all_addr dst_addr; |
f6b7dc47 | 520 | struct in_addr netmask, dst_addr_4; |
cdeda28f SK |
521 | size_t m; |
522 | ssize_t n; | |
523 | int if_index = 0; | |
44a2a316 SK |
524 | struct iovec iov[1]; |
525 | struct msghdr msg; | |
526 | struct cmsghdr *cmptr; | |
44a2a316 SK |
527 | union { |
528 | struct cmsghdr align; /* this ensures alignment */ | |
529 | #ifdef HAVE_IPV6 | |
530 | char control6[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
531 | #endif | |
5e9e0efb | 532 | #if defined(HAVE_LINUX_NETWORK) |
44a2a316 SK |
533 | char control[CMSG_SPACE(sizeof(struct in_pktinfo))]; |
534 | #elif defined(IP_RECVDSTADDR) | |
535 | char control[CMSG_SPACE(sizeof(struct in_addr)) + | |
536 | CMSG_SPACE(sizeof(struct sockaddr_dl))]; | |
537 | #endif | |
538 | } control_u; | |
539 | ||
cdeda28f SK |
540 | /* packet buffer overwritten */ |
541 | daemon->srv_save = NULL; | |
542 | ||
f6b7dc47 SK |
543 | if (listen->family == AF_INET && (daemon->options & OPT_NOWILD)) |
544 | { | |
545 | dst_addr_4 = listen->iface->addr.in.sin_addr; | |
546 | netmask = listen->iface->netmask; | |
547 | } | |
548 | else | |
3d8df260 SK |
549 | { |
550 | dst_addr_4.s_addr = 0; | |
551 | netmask.s_addr = 0; | |
552 | } | |
f6b7dc47 | 553 | |
3be34541 SK |
554 | iov[0].iov_base = daemon->packet; |
555 | iov[0].iov_len = daemon->edns_pktsz; | |
44a2a316 SK |
556 | |
557 | msg.msg_control = control_u.control; | |
558 | msg.msg_controllen = sizeof(control_u); | |
559 | msg.msg_flags = 0; | |
560 | msg.msg_name = &source_addr; | |
561 | msg.msg_namelen = sizeof(source_addr); | |
562 | msg.msg_iov = iov; | |
563 | msg.msg_iovlen = 1; | |
564 | ||
de37951c | 565 | if ((n = recvmsg(listen->fd, &msg, 0)) == -1) |
3be34541 | 566 | return; |
44a2a316 | 567 | |
5e9e0efb SK |
568 | if (n < (int)sizeof(HEADER) || |
569 | (msg.msg_flags & MSG_TRUNC) || | |
570 | header->qr) | |
26128d27 SK |
571 | return; |
572 | ||
44a2a316 SK |
573 | source_addr.sa.sa_family = listen->family; |
574 | #ifdef HAVE_IPV6 | |
575 | if (listen->family == AF_INET6) | |
5e9e0efb | 576 | source_addr.in6.sin6_flowinfo = 0; |
44a2a316 SK |
577 | #endif |
578 | ||
26128d27 SK |
579 | if (!(daemon->options & OPT_NOWILD)) |
580 | { | |
581 | struct ifreq ifr; | |
582 | ||
583 | if (msg.msg_controllen < sizeof(struct cmsghdr)) | |
584 | return; | |
44a2a316 | 585 | |
5e9e0efb | 586 | #if defined(HAVE_LINUX_NETWORK) |
26128d27 SK |
587 | if (listen->family == AF_INET) |
588 | for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr)) | |
589 | if (cmptr->cmsg_level == SOL_IP && cmptr->cmsg_type == IP_PKTINFO) | |
590 | { | |
f6b7dc47 | 591 | dst_addr_4 = dst_addr.addr.addr4 = ((struct in_pktinfo *)CMSG_DATA(cmptr))->ipi_spec_dst; |
26128d27 SK |
592 | if_index = ((struct in_pktinfo *)CMSG_DATA(cmptr))->ipi_ifindex; |
593 | } | |
594 | #elif defined(IP_RECVDSTADDR) && defined(IP_RECVIF) | |
595 | if (listen->family == AF_INET) | |
44a2a316 | 596 | { |
26128d27 SK |
597 | for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr)) |
598 | if (cmptr->cmsg_level == IPPROTO_IP && cmptr->cmsg_type == IP_RECVDSTADDR) | |
f6b7dc47 | 599 | dst_addr_4 = dst_addr.addr.addr4 = *((struct in_addr *)CMSG_DATA(cmptr)); |
26128d27 SK |
600 | else if (cmptr->cmsg_level == IPPROTO_IP && cmptr->cmsg_type == IP_RECVIF) |
601 | if_index = ((struct sockaddr_dl *)CMSG_DATA(cmptr))->sdl_index; | |
44a2a316 | 602 | } |
44a2a316 | 603 | #endif |
26128d27 | 604 | |
44a2a316 | 605 | #ifdef HAVE_IPV6 |
26128d27 SK |
606 | if (listen->family == AF_INET6) |
607 | { | |
608 | for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr)) | |
609 | if (cmptr->cmsg_level == IPV6_LEVEL && cmptr->cmsg_type == IPV6_PKTINFO) | |
610 | { | |
611 | dst_addr.addr.addr6 = ((struct in6_pktinfo *)CMSG_DATA(cmptr))->ipi6_addr; | |
612 | if_index =((struct in6_pktinfo *)CMSG_DATA(cmptr))->ipi6_ifindex; | |
613 | } | |
614 | } | |
44a2a316 | 615 | #endif |
26128d27 SK |
616 | |
617 | /* enforce available interface configuration */ | |
618 | ||
8a911ccc | 619 | if (if_index == 0) |
3be34541 | 620 | return; |
44a2a316 | 621 | |
8a911ccc | 622 | #ifdef SIOCGIFNAME |
832af0ba SK |
623 | ifr.ifr_ifindex = if_index; |
624 | if (ioctl(listen->fd, SIOCGIFNAME, &ifr) == -1) | |
625 | return; | |
8a911ccc | 626 | #else |
832af0ba SK |
627 | if (!if_indextoname(if_index, ifr.ifr_name)) |
628 | return; | |
8a911ccc | 629 | #endif |
832af0ba SK |
630 | |
631 | if (!iface_check(daemon, listen->family, &dst_addr, &ifr, &if_index)) | |
5e9e0efb | 632 | return; |
832af0ba SK |
633 | |
634 | if (listen->family == AF_INET && | |
635 | (daemon->options & OPT_LOCALISE) && | |
636 | ioctl(listen->fd, SIOCGIFNETMASK, &ifr) == -1) | |
637 | return; | |
638 | ||
639 | netmask = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr; | |
44a2a316 SK |
640 | } |
641 | ||
cdeda28f | 642 | if (extract_request(header, (size_t)n, daemon->namebuff, &type)) |
44a2a316 SK |
643 | { |
644 | if (listen->family == AF_INET) | |
3be34541 | 645 | log_query(F_QUERY | F_IPV4 | F_FORWARD, daemon->namebuff, |
fd9fa481 | 646 | (struct all_addr *)&source_addr.in.sin_addr, type, NULL, 0); |
44a2a316 SK |
647 | #ifdef HAVE_IPV6 |
648 | else | |
3be34541 | 649 | log_query(F_QUERY | F_IPV6 | F_FORWARD, daemon->namebuff, |
fd9fa481 | 650 | (struct all_addr *)&source_addr.in6.sin6_addr, type, NULL, 0); |
44a2a316 SK |
651 | #endif |
652 | } | |
653 | ||
cdeda28f | 654 | m = answer_request (header, ((char *) header) + PACKETSZ, (size_t)n, daemon, |
f6b7dc47 | 655 | dst_addr_4, netmask, now); |
44a2a316 | 656 | if (m >= 1) |
3be34541 | 657 | send_from(listen->fd, daemon->options & OPT_NOWILD, (char *)header, m, &source_addr, &dst_addr, if_index); |
44a2a316 | 658 | else |
3be34541 | 659 | forward_query(daemon, listen->fd, &source_addr, &dst_addr, if_index, |
cdeda28f | 660 | header, (size_t)n, now, NULL); |
44a2a316 SK |
661 | } |
662 | ||
feba5c1d SK |
663 | /* The daemon forks before calling this: it should deal with one connection, |
664 | blocking as neccessary, and then return. Note, need to be a bit careful | |
665 | about resources for debug mode, when the fork is suppressed: that's | |
666 | done by the caller. */ | |
3d8df260 SK |
667 | unsigned char *tcp_request(struct daemon *daemon, int confd, time_t now, |
668 | struct in_addr local_addr, struct in_addr netmask) | |
feba5c1d | 669 | { |
cdeda28f SK |
670 | int size = 0; |
671 | size_t m; | |
c1bb8504 | 672 | unsigned short qtype, gotname; |
feba5c1d SK |
673 | unsigned char c1, c2; |
674 | /* Max TCP packet + slop */ | |
3d8df260 | 675 | unsigned char *packet = malloc(65536 + MAXDNAME + RRFIXEDSZ); |
feba5c1d | 676 | HEADER *header; |
3be34541 SK |
677 | struct server *last_server; |
678 | ||
feba5c1d SK |
679 | while (1) |
680 | { | |
681 | if (!packet || | |
682 | !read_write(confd, &c1, 1, 1) || !read_write(confd, &c2, 1, 1) || | |
683 | !(size = c1 << 8 | c2) || | |
684 | !read_write(confd, packet, size, 1)) | |
685 | return packet; | |
686 | ||
687 | if (size < (int)sizeof(HEADER)) | |
688 | continue; | |
689 | ||
690 | header = (HEADER *)packet; | |
691 | ||
3be34541 | 692 | if ((gotname = extract_request(header, (unsigned int)size, daemon->namebuff, &qtype))) |
feba5c1d SK |
693 | { |
694 | union mysockaddr peer_addr; | |
695 | socklen_t peer_len = sizeof(union mysockaddr); | |
696 | ||
697 | if (getpeername(confd, (struct sockaddr *)&peer_addr, &peer_len) != -1) | |
698 | { | |
699 | if (peer_addr.sa.sa_family == AF_INET) | |
3be34541 | 700 | log_query(F_QUERY | F_IPV4 | F_FORWARD, daemon->namebuff, |
fd9fa481 | 701 | (struct all_addr *)&peer_addr.in.sin_addr, qtype, NULL, 0); |
feba5c1d SK |
702 | #ifdef HAVE_IPV6 |
703 | else | |
3be34541 | 704 | log_query(F_QUERY | F_IPV6 | F_FORWARD, daemon->namebuff, |
fd9fa481 | 705 | (struct all_addr *)&peer_addr.in6.sin6_addr, qtype, NULL, 0); |
feba5c1d SK |
706 | #endif |
707 | } | |
708 | } | |
709 | ||
710 | /* m > 0 if answered from cache */ | |
f6b7dc47 SK |
711 | m = answer_request(header, ((char *) header) + 65536, (unsigned int)size, daemon, |
712 | local_addr, netmask, now); | |
feba5c1d SK |
713 | |
714 | if (m == 0) | |
715 | { | |
716 | unsigned short flags = 0; | |
feba5c1d SK |
717 | struct all_addr *addrp = NULL; |
718 | int type = 0; | |
719 | char *domain = NULL; | |
720 | ||
721 | if (gotname) | |
36717eee | 722 | flags = search_servers(daemon, now, &addrp, gotname, daemon->namebuff, &type, &domain); |
feba5c1d | 723 | |
3be34541 SK |
724 | if (type != 0 || (daemon->options & OPT_ORDER) || !daemon->last_server) |
725 | last_server = daemon->servers; | |
726 | else | |
727 | last_server = daemon->last_server; | |
feba5c1d SK |
728 | |
729 | if (!flags && last_server) | |
730 | { | |
731 | struct server *firstsendto = NULL; | |
0a852541 SK |
732 | unsigned int crc = questions_crc(header, (unsigned int)size, daemon->namebuff); |
733 | ||
feba5c1d SK |
734 | /* Loop round available servers until we succeed in connecting to one. |
735 | Note that this code subtley ensures that consecutive queries on this connection | |
736 | which can go to the same server, do so. */ | |
737 | while (1) | |
738 | { | |
739 | if (!firstsendto) | |
740 | firstsendto = last_server; | |
741 | else | |
742 | { | |
743 | if (!(last_server = last_server->next)) | |
3be34541 | 744 | last_server = daemon->servers; |
feba5c1d SK |
745 | |
746 | if (last_server == firstsendto) | |
747 | break; | |
748 | } | |
749 | ||
750 | /* server for wrong domain */ | |
751 | if (type != (last_server->flags & SERV_TYPE) || | |
752 | (type == SERV_HAS_DOMAIN && !hostname_isequal(domain, last_server->domain))) | |
753 | continue; | |
754 | ||
755 | if ((last_server->tcpfd == -1) && | |
756 | (last_server->tcpfd = socket(last_server->addr.sa.sa_family, SOCK_STREAM, 0)) != -1 && | |
757 | connect(last_server->tcpfd, &last_server->addr.sa, sa_len(&last_server->addr)) == -1) | |
758 | { | |
759 | close(last_server->tcpfd); | |
760 | last_server->tcpfd = -1; | |
761 | } | |
762 | ||
763 | if (last_server->tcpfd == -1) | |
764 | continue; | |
765 | ||
766 | c1 = size >> 8; | |
767 | c2 = size; | |
768 | ||
769 | if (!read_write(last_server->tcpfd, &c1, 1, 0) || | |
770 | !read_write(last_server->tcpfd, &c2, 1, 0) || | |
771 | !read_write(last_server->tcpfd, packet, size, 0) || | |
772 | !read_write(last_server->tcpfd, &c1, 1, 1) || | |
773 | !read_write(last_server->tcpfd, &c2, 1, 1)) | |
774 | { | |
775 | close(last_server->tcpfd); | |
776 | last_server->tcpfd = -1; | |
777 | continue; | |
778 | } | |
779 | ||
780 | m = (c1 << 8) | c2; | |
781 | if (!read_write(last_server->tcpfd, packet, m, 1)) | |
782 | return packet; | |
783 | ||
784 | if (!gotname) | |
3be34541 | 785 | strcpy(daemon->namebuff, "query"); |
feba5c1d | 786 | if (last_server->addr.sa.sa_family == AF_INET) |
3be34541 | 787 | log_query(F_SERVER | F_IPV4 | F_FORWARD, daemon->namebuff, |
fd9fa481 | 788 | (struct all_addr *)&last_server->addr.in.sin_addr, 0, NULL, 0); |
feba5c1d SK |
789 | #ifdef HAVE_IPV6 |
790 | else | |
3be34541 | 791 | log_query(F_SERVER | F_IPV6 | F_FORWARD, daemon->namebuff, |
fd9fa481 | 792 | (struct all_addr *)&last_server->addr.in6.sin6_addr, 0, NULL, 0); |
feba5c1d SK |
793 | #endif |
794 | ||
795 | /* There's no point in updating the cache, since this process will exit and | |
832af0ba | 796 | lose the information after a few queries. We make this call for the alias and |
feba5c1d | 797 | bogus-nxdomain side-effects. */ |
832af0ba SK |
798 | /* If the crc of the question section doesn't match the crc we sent, then |
799 | someone might be attempting to insert bogus values into the cache by | |
800 | sending replies containing questions and bogus answers. */ | |
801 | if (crc == questions_crc(header, (unsigned int)m, daemon->namebuff)) | |
802 | m = process_reply(daemon, header, now, last_server, (unsigned int)m); | |
feba5c1d SK |
803 | |
804 | break; | |
805 | } | |
806 | } | |
807 | ||
808 | /* In case of local answer or no connections made. */ | |
809 | if (m == 0) | |
3be34541 | 810 | m = setup_reply(header, (unsigned int)size, addrp, flags, daemon->local_ttl); |
feba5c1d SK |
811 | } |
812 | ||
813 | c1 = m>>8; | |
814 | c2 = m; | |
815 | if (!read_write(confd, &c1, 1, 0) || | |
816 | !read_write(confd, &c2, 1, 0) || | |
817 | !read_write(confd, packet, m, 0)) | |
818 | return packet; | |
819 | } | |
820 | } | |
821 | ||
1697269c | 822 | static struct frec *allocate_frec(time_t now) |
9e4abcb5 | 823 | { |
1697269c SK |
824 | struct frec *f; |
825 | ||
826 | if ((f = (struct frec *)malloc(sizeof(struct frec)))) | |
9e4abcb5 | 827 | { |
1697269c SK |
828 | f->next = frec_list; |
829 | f->time = now; | |
832af0ba | 830 | f->sentto = NULL; |
1697269c SK |
831 | frec_list = f; |
832 | } | |
9e4abcb5 | 833 | |
1697269c SK |
834 | return f; |
835 | } | |
9e4abcb5 | 836 | |
1697269c SK |
837 | /* if wait==NULL return a free or older than TIMEOUT record. |
838 | else return *wait zero if one available, or *wait is delay to | |
839 | when the oldest in-use record will expire. */ | |
840 | struct frec *get_new_frec(struct daemon *daemon, time_t now, int *wait) | |
841 | { | |
842 | struct frec *f, *oldest; | |
843 | int count; | |
844 | ||
845 | if (wait) | |
846 | *wait = 0; | |
847 | ||
848 | for (f = frec_list, oldest = NULL, count = 0; f; f = f->next, count++) | |
832af0ba | 849 | if (!f->sentto) |
1697269c SK |
850 | { |
851 | f->time = now; | |
852 | return f; | |
853 | } | |
854 | else if (!oldest || difftime(f->time, oldest->time) <= 0) | |
855 | oldest = f; | |
9e4abcb5 SK |
856 | |
857 | /* can't find empty one, use oldest if there is one | |
858 | and it's older than timeout */ | |
1697269c | 859 | if (oldest && ((int)difftime(now, oldest->time)) >= TIMEOUT) |
9e4abcb5 | 860 | { |
1697269c SK |
861 | /* keep stuff for twice timeout if we can by allocating a new |
862 | record instead */ | |
863 | if (difftime(now, oldest->time) < 2*TIMEOUT && | |
864 | count <= daemon->ftabsize && | |
865 | (f = allocate_frec(now))) | |
866 | return f; | |
867 | ||
868 | if (!wait) | |
869 | { | |
832af0ba | 870 | oldest->sentto = 0; |
1697269c SK |
871 | oldest->time = now; |
872 | } | |
9e4abcb5 SK |
873 | return oldest; |
874 | } | |
875 | ||
1697269c | 876 | /* none available, calculate time 'till oldest record expires */ |
208b65c5 | 877 | if (count > daemon->ftabsize) |
1697269c SK |
878 | { |
879 | if (oldest && wait) | |
880 | *wait = oldest->time + (time_t)TIMEOUT - now; | |
9e4abcb5 SK |
881 | return NULL; |
882 | } | |
1697269c SK |
883 | |
884 | if (!(f = allocate_frec(now)) && wait) | |
885 | /* wait one second on malloc failure */ | |
886 | *wait = 1; | |
9e4abcb5 | 887 | |
9e4abcb5 SK |
888 | return f; /* OK if malloc fails and this is NULL */ |
889 | } | |
890 | ||
832af0ba SK |
891 | /* crc is all-ones if not known. */ |
892 | static struct frec *lookup_frec(unsigned short id, unsigned int crc) | |
9e4abcb5 SK |
893 | { |
894 | struct frec *f; | |
895 | ||
896 | for(f = frec_list; f; f = f->next) | |
832af0ba SK |
897 | if (f->sentto && f->new_id == id && |
898 | (f->crc == crc || crc == 0xffffffff)) | |
9e4abcb5 SK |
899 | return f; |
900 | ||
901 | return NULL; | |
902 | } | |
903 | ||
904 | static struct frec *lookup_frec_by_sender(unsigned short id, | |
fd9fa481 SK |
905 | union mysockaddr *addr, |
906 | unsigned int crc) | |
9e4abcb5 | 907 | { |
feba5c1d SK |
908 | struct frec *f; |
909 | ||
9e4abcb5 | 910 | for(f = frec_list; f; f = f->next) |
832af0ba | 911 | if (f->sentto && |
9e4abcb5 | 912 | f->orig_id == id && |
fd9fa481 | 913 | f->crc == crc && |
9e4abcb5 SK |
914 | sockaddr_isequal(&f->source, addr)) |
915 | return f; | |
916 | ||
917 | return NULL; | |
918 | } | |
919 | ||
849a8357 SK |
920 | /* A server record is going away, remove references to it */ |
921 | void server_gone(struct daemon *daemon, struct server *server) | |
922 | { | |
923 | struct frec *f; | |
924 | ||
925 | for (f = frec_list; f; f = f->next) | |
832af0ba SK |
926 | if (f->sentto && f->sentto == server) |
927 | f->sentto = NULL; | |
849a8357 SK |
928 | |
929 | if (daemon->last_server == server) | |
930 | daemon->last_server = NULL; | |
931 | ||
932 | if (daemon->srv_save == server) | |
933 | daemon->srv_save = NULL; | |
934 | } | |
9e4abcb5 | 935 | |
832af0ba SK |
936 | /* return unique random ids. |
937 | For signed packets we can't change the ID without breaking the | |
938 | signing, so we keep the same one. In this case force is set, and this | |
939 | routine degenerates into killing any conflicting forward record. */ | |
940 | static unsigned short get_id(int force, unsigned short force_id, unsigned int crc) | |
9e4abcb5 SK |
941 | { |
942 | unsigned short ret = 0; | |
832af0ba SK |
943 | |
944 | if (force) | |
9e4abcb5 | 945 | { |
832af0ba SK |
946 | struct frec *f = lookup_frec(force_id, crc); |
947 | if (f) | |
948 | f->sentto = NULL; /* free */ | |
949 | ret = force_id; | |
9e4abcb5 | 950 | } |
832af0ba SK |
951 | else do |
952 | ret = rand16(); | |
953 | while (lookup_frec(ret, crc)); | |
954 | ||
9e4abcb5 SK |
955 | return ret; |
956 | } | |
957 | ||
958 | ||
959 | ||
960 | ||
961 |