Mercurial > dnsbl
annotate src/dnsbl.cpp @ 177:a4d313c2460b
start embedded dcc filtering
author | carl |
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date | Sun, 30 Sep 2007 10:27:14 -0700 |
parents | da0c41b9f672 |
children | d6531c702be3 |
rev | line source |
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94 | 1 /* |
2 | |
152 | 3 Copyright (c) 2007 Carl Byington - 510 Software Group, released under |
4 the GPL version 3 or any later version at your choice available at | |
5 http://www.gnu.org/licenses/gpl-3.0.txt | |
94 | 6 |
7 Based on a sample milter Copyright (c) 2000-2003 Sendmail, Inc. and its | |
8 suppliers. Inspired by the DCC by Rhyolite Software | |
9 | |
177 | 10 -b port The port used to talk to the dcc interface daemon |
94 | 11 -r port The port used to talk to our internal dns resolver processes |
12 -p port The port through which the MTA will connect to this milter. | |
13 -t sec The timeout value. | |
14 -c Check the config, and print a copy to stdout. Don't start the | |
15 milter or do anything with the socket. | |
16 -s Stress test by loading and deleting the current config in a loop. | |
163 | 17 -d level set the debug level |
94 | 18 -e f|t Print the results of looking up from address f and to address |
19 t in the current config | |
20 | |
21 */ | |
22 | |
23 | |
24 // from sendmail sample | |
25 #include <sys/types.h> | |
26 #include <sys/stat.h> | |
27 #include <errno.h> | |
28 #include <sysexits.h> | |
29 #include <unistd.h> | |
30 | |
31 // needed for socket io | |
32 #include <sys/ioctl.h> | |
33 #include <net/if.h> | |
34 #include <arpa/inet.h> | |
35 #include <netinet/in.h> | |
36 #include <netinet/tcp.h> | |
37 #include <netdb.h> | |
38 #include <sys/socket.h> | |
39 #include <sys/un.h> | |
40 | |
41 // needed for thread | |
42 #include <pthread.h> | |
43 | |
44 // needed for std c++ collections | |
45 #include <set> | |
46 #include <map> | |
47 #include <list> | |
48 | |
49 // for the dns resolver | |
50 #include <netinet/in.h> | |
51 #include <arpa/nameser.h> | |
52 #include <resolv.h> | |
53 | |
54 // misc stuff needed here | |
55 #include <ctype.h> | |
56 #include <syslog.h> | |
57 #include <pwd.h> | |
58 #include <sys/wait.h> /* header for waitpid() and various macros */ | |
59 #include <signal.h> /* header for signal functions */ | |
60 | |
61 #include "includes.h" | |
62 | |
63 static char* dnsbl_version="$Id$"; | |
64 | |
65 | |
66 extern "C" { | |
148
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67 #include <libmilter/mfapi.h> |
94 | 68 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr); |
163 | 69 sfsistat mlfi_helo(SMFICTX * ctx, char *helohost); |
94 | 70 sfsistat mlfi_envfrom(SMFICTX *ctx, char **argv); |
71 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **argv); | |
163 | 72 sfsistat mlfi_header(SMFICTX* ctx, char* headerf, char* headerv); |
94 | 73 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len); |
74 sfsistat mlfi_eom(SMFICTX *ctx); | |
75 sfsistat mlfi_abort(SMFICTX *ctx); | |
76 sfsistat mlfi_close(SMFICTX *ctx); | |
77 void sig_chld(int signo); | |
78 } | |
79 | |
80 int debug_syslog = 0; | |
81 bool syslog_opened = false; | |
82 bool use_syslog = true; // false to printf | |
83 bool loader_run = true; // used to stop the config loader thread | |
84 CONFIG *config = NULL; // protected by the config_mutex | |
85 int generation = 0; // protected by the config_mutex | |
86 const int maxlen = 1000; // used for snprintf buffers | |
87 | |
88 pthread_mutex_t config_mutex; | |
89 pthread_mutex_t syslog_mutex; | |
90 pthread_mutex_t resolve_mutex; | |
91 pthread_mutex_t fd_pool_mutex; | |
136 | 92 pthread_mutex_t rate_mutex; |
94 | 93 |
94 std::set<int> fd_pool; | |
136 | 95 int NULL_SOCKET = -1; |
96 const time_t ERROR_SOCKET_TIME = 60; // number of seconds between attempts to open a socket to the dns resolver process | |
97 char *resolver_port = NULL; // unix domain socket to talk to the dns resolver process | |
98 int resolver_socket = NULL_SOCKET; // socket used to listen for resolver requests | |
177 | 99 char *dccifd_port = NULL; // unix domain socket to talk to the dcc interface daemon |
136 | 100 time_t last_error_time; |
101 int resolver_sock_count = 0; // protected with fd_pool_mutex | |
102 int resolver_pool_size = 0; // protected with fd_pool_mutex | |
103 rcpt_rates rcpt_counts; // protected with rate_mutex | |
94 | 104 |
105 | |
106 struct ns_map { | |
107 // all the strings are owned by the keys/values in the ns_host string map | |
108 string_map ns_host; // nameserver name -> host name that uses this name server | |
109 ns_mapper ns_ip; // nameserver name -> ip address of the name server | |
110 ~ns_map(); | |
111 void add(char *name, char *refer); | |
112 }; | |
113 | |
114 | |
115 ns_map::~ns_map() { | |
116 for (string_map::iterator i=ns_host.begin(); i!=ns_host.end(); i++) { | |
117 char *x = (*i).first; | |
118 char *y = (*i).second; | |
119 free(x); | |
120 free(y); | |
121 } | |
122 ns_ip.clear(); | |
123 ns_host.clear(); | |
124 } | |
125 | |
126 | |
127 void ns_map::add(char *name, char *refer) { | |
128 string_map::iterator i = ns_host.find(name); | |
129 if (i != ns_host.end()) return; | |
130 char *x = strdup(name); | |
131 char *y = strdup(refer); | |
132 ns_ip[x] = 0; | |
133 ns_host[x] = y; | |
134 | |
135 } | |
136 | |
137 // packed structure to allow a single socket write to dump the | |
138 // length and the following answer. The packing attribute is gcc specific. | |
139 struct glommer { | |
140 int length; | |
141 #ifdef NS_PACKETSZ | |
115 | 142 u_char answer[NS_PACKETSZ*4]; // with a resolver, we return resolver answers |
94 | 143 #else |
144 int answer; // without a resolver, we return a single ip4 address, 0 == no answer | |
145 #endif | |
146 } __attribute__ ((packed)); | |
147 | |
148 | |
149 //////////////////////////////////////////////// | |
136 | 150 // helper to manipulate recipient counts |
151 // | |
152 int incr_rcpt_count(char *user); | |
153 int incr_rcpt_count(char *user) { | |
154 pthread_mutex_lock(&rate_mutex); | |
155 rcpt_rates::iterator i = rcpt_counts.find(user); | |
138 | 156 int c = 1; |
157 if (i == rcpt_counts.end()) { | |
158 user = strdup(user); | |
159 rcpt_counts[user] = c; | |
160 } | |
161 else { | |
139 | 162 c = ++((*i).second); |
138 | 163 } |
136 | 164 pthread_mutex_unlock(&rate_mutex); |
165 return c; | |
166 } | |
167 | |
168 //////////////////////////////////////////////// | |
94 | 169 // helper to discard the strings held by a context_map |
170 // | |
171 void discard(context_map &cm); | |
172 void discard(context_map &cm) { | |
173 for (context_map::iterator i=cm.begin(); i!=cm.end(); i++) { | |
174 char *x = (*i).first; | |
175 free(x); | |
176 } | |
177 cm.clear(); | |
178 } | |
179 | |
180 | |
181 //////////////////////////////////////////////// | |
182 // helper to register a string in a context_map | |
183 // | |
184 void register_string(context_map &cm, char *name, CONTEXT *con); | |
185 void register_string(context_map &cm, char *name, CONTEXT *con) { | |
186 context_map::iterator i = cm.find(name); | |
187 if (i != cm.end()) return; | |
188 char *x = strdup(name); | |
189 cm[x] = con; | |
190 } | |
191 | |
192 | |
193 //////////////////////////////////////////////// | |
194 // disconnect the fd from the dns resolver process | |
195 // | |
196 void my_disconnect(int sock, bool decrement = true); | |
197 void my_disconnect(int sock, bool decrement) { | |
198 if (sock != NULL_SOCKET) { | |
199 if (decrement) { | |
200 pthread_mutex_lock(&fd_pool_mutex); | |
201 resolver_sock_count--; | |
202 pthread_mutex_unlock(&fd_pool_mutex); | |
203 } | |
204 shutdown(sock, SHUT_RDWR); | |
205 close(sock); | |
206 } | |
207 } | |
208 | |
209 | |
210 //////////////////////////////////////////////// | |
211 // return fd connected to the dns resolver process | |
212 // | |
213 int my_connect(); | |
214 int my_connect() { | |
215 // if we have had recent errors, don't even try to open the socket | |
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216 if ((time(NULL) - last_error_time) < ERROR_SOCKET_TIME) return NULL_SOCKET; |
94 | 217 |
218 // nothing recent, maybe this time it will work | |
219 int sock = NULL_SOCKET; | |
220 sockaddr_un server; | |
221 memset(&server, '\0', sizeof(server)); | |
222 server.sun_family = AF_UNIX; | |
223 strncpy(server.sun_path, resolver_port, sizeof(server.sun_path)-1); | |
224 sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
225 if (sock != NULL_SOCKET) { | |
226 bool rc = (connect(sock, (sockaddr *)&server, sizeof(server)) == 0); | |
227 if (!rc) { | |
228 my_disconnect(sock, false); | |
229 sock = NULL_SOCKET; | |
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230 last_error_time = time(NULL); |
94 | 231 } |
232 } | |
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233 else last_error_time = time(NULL); |
94 | 234 if (sock != NULL_SOCKET) { |
235 pthread_mutex_lock(&fd_pool_mutex); | |
236 resolver_sock_count++; | |
237 pthread_mutex_unlock(&fd_pool_mutex); | |
238 } | |
239 return sock; | |
240 } | |
241 | |
242 | |
243 mlfiPriv::mlfiPriv() { | |
244 pthread_mutex_lock(&config_mutex); | |
245 pc = config; | |
246 pc->reference_count++; | |
247 pthread_mutex_unlock(&config_mutex); | |
248 get_fd(); | |
249 ip = 0; | |
163 | 250 helo = NULL; |
94 | 251 mailaddr = NULL; |
252 queueid = NULL; | |
136 | 253 authenticated = NULL; |
168 | 254 client_name = NULL; |
94 | 255 have_whites = false; |
256 only_whites = true; | |
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257 want_spamassassin = false; |
94 | 258 memory = NULL; |
259 scanner = NULL; | |
165 | 260 assassin = NULL; |
94 | 261 content_suffix = NULL; |
262 content_message = NULL; | |
119 | 263 uribl_suffix = NULL; |
264 uribl_message = NULL; | |
94 | 265 content_host_ignore = NULL; |
266 } | |
267 | |
268 mlfiPriv::~mlfiPriv() { | |
269 return_fd(); | |
270 pthread_mutex_lock(&config_mutex); | |
271 pc->reference_count--; | |
146 | 272 bool last = (!pc->reference_count) && (pc != config); |
94 | 273 pthread_mutex_unlock(&config_mutex); |
146 | 274 if (last) delete pc; // free this config, since we were the last reference to it |
163 | 275 if (helo) free(helo); |
94 | 276 reset(true); |
277 } | |
278 | |
279 void mlfiPriv::reset(bool final) { | |
136 | 280 if (mailaddr) free(mailaddr); |
281 if (queueid) free(queueid); | |
282 if (authenticated) free(authenticated); | |
168 | 283 if (client_name) free(client_name); |
94 | 284 discard(env_to); |
163 | 285 if (memory) delete memory; |
286 if (scanner) delete scanner; | |
287 if (assassin) delete assassin; | |
94 | 288 if (!final) { |
289 mailaddr = NULL; | |
290 queueid = NULL; | |
136 | 291 authenticated = NULL; |
168 | 292 client_name = NULL; |
94 | 293 have_whites = false; |
294 only_whites = true; | |
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295 want_spamassassin = false; |
94 | 296 memory = NULL; |
297 scanner = NULL; | |
163 | 298 assassin = NULL; |
94 | 299 content_suffix = NULL; |
300 content_message = NULL; | |
119 | 301 uribl_suffix = NULL; |
302 uribl_message = NULL; | |
94 | 303 content_host_ignore = NULL; |
304 } | |
305 } | |
306 | |
307 void mlfiPriv::get_fd() { | |
308 err = true; | |
309 fd = NULL_SOCKET; | |
310 int result = pthread_mutex_lock(&fd_pool_mutex); | |
311 if (!result) { | |
312 std::set<int>::iterator i; | |
313 i = fd_pool.begin(); | |
314 if (i != fd_pool.end()) { | |
315 // have at least one fd in the pool | |
316 err = false; | |
317 fd = *i; | |
318 fd_pool.erase(fd); | |
319 resolver_pool_size--; | |
320 pthread_mutex_unlock(&fd_pool_mutex); | |
321 } | |
322 else { | |
323 // pool is empty, get a new fd | |
324 pthread_mutex_unlock(&fd_pool_mutex); | |
325 fd = my_connect(); | |
326 err = (fd == NULL_SOCKET); | |
327 } | |
328 } | |
329 else { | |
330 // cannot lock the pool, just get a new fd | |
331 fd = my_connect(); | |
332 err = (fd == NULL_SOCKET); | |
333 } | |
334 } | |
335 | |
336 void mlfiPriv::return_fd() { | |
337 if (err) { | |
338 // this fd got a socket error, so close it, rather than returning it to the pool | |
339 my_disconnect(fd); | |
340 } | |
341 else { | |
342 int result = pthread_mutex_lock(&fd_pool_mutex); | |
343 if (!result) { | |
344 if ((resolver_sock_count > resolver_pool_size*5) || (resolver_pool_size < 5)) { | |
345 // return the fd to the pool | |
346 fd_pool.insert(fd); | |
347 resolver_pool_size++; | |
348 pthread_mutex_unlock(&fd_pool_mutex); | |
349 } | |
350 else { | |
351 // more than 20% of the open resolver sockets are in the pool, and the | |
352 // pool as at least 5 sockets. that is enough, so just close this one. | |
353 pthread_mutex_unlock(&fd_pool_mutex); | |
354 my_disconnect(fd); | |
355 } | |
356 } | |
357 else { | |
358 // could not lock the pool, so just close the fd | |
359 my_disconnect(fd); | |
360 } | |
361 } | |
362 } | |
363 | |
177 | 364 size_t mlfiPriv::my_write(const char *buf, size_t len) { |
94 | 365 if (err) return 0; |
177 | 366 size_t rs = 0; |
94 | 367 while (len) { |
177 | 368 size_t ws = write(fd, buf, len); |
94 | 369 if (ws > 0) { |
370 rs += ws; | |
371 len -= ws; | |
372 buf += ws; | |
373 } | |
374 else { | |
375 // peer closed the socket! | |
376 rs = 0; | |
377 err = true; | |
378 break; | |
379 } | |
380 } | |
381 return rs; | |
382 } | |
383 | |
177 | 384 size_t mlfiPriv::my_read(char *buf, size_t len) { |
94 | 385 if (err) return 0; |
177 | 386 size_t rs = 0; |
134 | 387 while (len) { |
177 | 388 size_t ws = read(fd, buf, len); |
94 | 389 if (ws > 0) { |
390 rs += ws; | |
391 len -= ws; | |
392 buf += ws; | |
393 } | |
394 else { | |
395 // peer closed the socket! | |
396 rs = 0; | |
397 err = true; | |
398 break; | |
399 } | |
400 } | |
401 return rs; | |
402 } | |
403 | |
404 void mlfiPriv::need_content_filter(char *rcpt, CONTEXT &con) { | |
405 register_string(env_to, rcpt, &con); | |
406 if (!memory) { | |
407 // first recipient that needs content filtering sets all | |
408 // the content filtering parameters | |
117 | 409 memory = new recorder(this, con.get_html_tags(), con.get_content_tlds(), con.get_content_cctlds()); |
94 | 410 scanner = new url_scanner(memory); |
411 content_suffix = con.get_content_suffix(); | |
412 content_message = con.get_content_message(); | |
119 | 413 uribl_suffix = con.get_uribl_suffix(); |
414 uribl_message = con.get_uribl_message(); | |
94 | 415 content_host_ignore = &con.get_content_host_ignore(); |
416 } | |
417 } | |
418 | |
419 #define MLFIPRIV ((struct mlfiPriv *) smfi_getpriv(ctx)) | |
420 | |
421 | |
422 //////////////////////////////////////////////// | |
423 // syslog a message | |
424 // | |
425 void my_syslog(mlfiPriv *priv, char *text) { | |
426 char buf[maxlen]; | |
427 if (priv) { | |
428 snprintf(buf, sizeof(buf), "%s: %s", priv->queueid, text); | |
429 text = buf; | |
430 } | |
431 if (use_syslog) { | |
432 pthread_mutex_lock(&syslog_mutex); | |
433 if (!syslog_opened) { | |
434 openlog("dnsbl", LOG_PID, LOG_MAIL); | |
435 syslog_opened = true; | |
436 } | |
437 syslog(LOG_NOTICE, "%s", text); | |
438 pthread_mutex_unlock(&syslog_mutex); | |
439 } | |
440 else { | |
441 printf("%s \n", text); | |
442 } | |
443 } | |
444 | |
163 | 445 void my_syslog(mlfiPriv *priv, string text) { |
446 if (debug_syslog > 3) { | |
447 char buf[maxlen]; | |
448 strncpy(buf, text.c_str(), sizeof(buf)); | |
449 buf[maxlen-1] = '\0'; // ensure null termination | |
450 my_syslog(priv, buf); | |
451 } | |
452 } | |
453 | |
94 | 454 void my_syslog(char *text) { |
455 my_syslog(NULL, text); | |
456 } | |
457 | |
458 | |
459 //////////////////////////////////////////////// | |
460 // read a resolver request from the socket, process it, and | |
461 // write the result back to the socket. | |
462 | |
463 void process_resolver_requests(int socket); | |
464 void process_resolver_requests(int socket) { | |
465 #ifdef NS_MAXDNAME | |
466 char question[NS_MAXDNAME]; | |
467 #else | |
468 char question[1000]; | |
469 #endif | |
470 glommer glom; | |
471 | |
472 int maxq = sizeof(question); | |
473 while (true) { | |
474 // read a question | |
475 int rs = 0; | |
476 while (rs < maxq) { | |
477 int ns = read(socket, question+rs, maxq-rs); | |
478 if (ns > 0) { | |
479 rs += ns; | |
480 if (question[rs-1] == '\0') { | |
481 // last byte read was the null terminator, we are done | |
482 break; | |
483 } | |
484 } | |
485 else { | |
486 // peer closed the socket | |
487 #ifdef RESOLVER_DEBUG | |
488 my_syslog("process_resolver_requests() peer closed socket while reading question"); | |
489 #endif | |
490 shutdown(socket, SHUT_RDWR); | |
491 close(socket); | |
492 return; | |
493 } | |
494 } | |
495 question[rs-1] = '\0'; // ensure null termination | |
496 | |
497 // find the answer | |
498 #ifdef NS_PACKETSZ | |
499 #ifdef RESOLVER_DEBUG | |
500 char text[1000]; | |
501 snprintf(text, sizeof(text), "process_resolver_requests() has a question %s", question); | |
502 my_syslog(text); | |
503 #endif | |
150 | 504 if ((_res.options & RES_INIT) == 0) res_init(); |
505 _res.retry = 2; | |
506 _res.retrans = RES_TIMEOUT; | |
94 | 507 glom.length = res_search(question, ns_c_in, ns_t_a, glom.answer, sizeof(glom.answer)); |
508 if (glom.length < 0) glom.length = 0; // represent all errors as zero length answers | |
509 #else | |
510 glom.length = sizeof(glom.answer); | |
511 glom.answer = 0; | |
512 struct hostent *host = gethostbyname(question); | |
513 if (host && (host->h_addrtype == AF_INET)) { | |
514 memcpy(&glom.answer, host->h_addr, sizeof(glom.answer)); | |
515 } | |
516 #endif | |
517 | |
518 // write the answer | |
519 char *buf = (char *)&glom; | |
520 int len = glom.length + sizeof(glom.length); | |
521 #ifdef RESOLVER_DEBUG | |
522 snprintf(text, sizeof(text), "process_resolver_requests() writing answer length %d for total %d", glom.length, len); | |
523 my_syslog(text); | |
524 #endif | |
525 int ws = 0; | |
526 while (len > ws) { | |
527 int ns = write(socket, buf+ws, len-ws); | |
528 if (ns > 0) { | |
529 ws += ns; | |
530 } | |
531 else { | |
532 // peer closed the socket! | |
533 #ifdef RESOLVER_DEBUG | |
534 my_syslog("process_resolver_requests() peer closed socket while writing answer"); | |
535 #endif | |
536 shutdown(socket, SHUT_RDWR); | |
537 close(socket); | |
538 return; | |
539 } | |
540 } | |
541 } | |
542 } | |
543 | |
544 | |
545 //////////////////////////////////////////////// | |
546 // ask a dns question and get an A record answer - we don't try | |
547 // very hard, just using the default resolver retry settings. | |
548 // If we cannot get an answer, we just accept the mail. | |
549 // | |
550 // | |
551 int dns_interface(mlfiPriv &priv, char *question, bool maybe_ip, ns_map *nameservers); | |
552 int dns_interface(mlfiPriv &priv, char *question, bool maybe_ip, ns_map *nameservers) { | |
553 // this part can be done without locking the resolver mutex. Each | |
554 // milter thread is talking over its own socket to a separate resolver | |
555 // process, which does the actual dns resolution. | |
556 if (priv.err) return 0; // cannot ask more questions on this socket. | |
134 | 557 if (maybe_ip) { |
558 // might be a bare ip address, try this first to avoid dns lookups that may not be needed | |
559 in_addr ip; | |
560 if (inet_aton(question, &ip)) { | |
561 return (int)ip.s_addr; | |
562 } | |
563 } | |
564 int n = strlen(question); | |
565 if (question[n-1] == '.') { | |
566 priv.my_write(question, n+1); // write the question including the null terminator | |
567 } | |
568 else { | |
569 priv.my_write(question, n); // write the question | |
570 priv.my_write(".", 2); // and the fully qualified . terminator and null string terminator | |
571 } | |
94 | 572 glommer glom; |
573 char *buf = (char *)&glom; | |
574 priv.my_read(buf, sizeof(glom.length)); | |
575 buf += sizeof(glom.length); | |
576 #ifdef RESOLVER_DEBUG | |
577 char text[1000]; | |
578 snprintf(text, sizeof(text), "dns_interface() wrote question %s and has answer length %d", question, glom.length); | |
579 my_syslog(text); | |
580 #endif | |
581 if ((glom.length < 0) || (glom.length > sizeof(glom.answer))) { | |
582 priv.err = true; | |
583 return 0; // cannot process overlarge answers | |
584 } | |
585 priv.my_read(buf, glom.length); | |
586 | |
587 #ifdef NS_PACKETSZ | |
588 // now we need to lock the resolver mutex to keep the milter threads from | |
589 // stepping on each other while parsing the dns answer. | |
590 int ret_address = 0; | |
591 pthread_mutex_lock(&resolve_mutex); | |
592 if (glom.length > 0) { | |
593 // parse the answer | |
594 ns_msg handle; | |
595 ns_rr rr; | |
596 if (ns_initparse(glom.answer, glom.length, &handle) == 0) { | |
597 // look for ns names | |
598 if (nameservers) { | |
599 ns_map &ns = *nameservers; | |
600 int rrnum = 0; | |
601 while (ns_parserr(&handle, ns_s_ns, rrnum++, &rr) == 0) { | |
602 if (ns_rr_type(rr) == ns_t_ns) { | |
603 char nam[NS_MAXDNAME+1]; | |
604 char *n = nam; | |
605 const u_char *p = ns_rr_rdata(rr); | |
606 while (((n-nam) < NS_MAXDNAME) && ((p-glom.answer) < glom.length) && *p) { | |
607 size_t s = *(p++); | |
608 if (s > 191) { | |
609 // compression pointer | |
610 s = (s-192)*256 + *(p++); | |
611 if (s >= glom.length) break; // pointer outside bounds of answer | |
612 p = glom.answer + s; | |
613 s = *(p++); | |
614 } | |
615 if (s > 0) { | |
616 if ((n-nam) >= (NS_MAXDNAME-s)) break; // destination would overflow name buffer | |
617 if ((p-glom.answer) >= (glom.length-s)) break; // source outside bounds of answer | |
618 memcpy(n, p, s); | |
619 n += s; | |
620 p += s; | |
621 *(n++) = '.'; | |
622 } | |
623 } | |
624 if (n-nam) n--; // remove trailing . | |
625 *n = '\0'; // null terminate it | |
626 ns.add(nam, question); // ns host to lookup later | |
627 } | |
628 } | |
629 rrnum = 0; | |
630 while (ns_parserr(&handle, ns_s_ar, rrnum++, &rr) == 0) { | |
631 if (ns_rr_type(rr) == ns_t_a) { | |
632 char* nam = (char*)ns_rr_name(rr); | |
633 ns_mapper::iterator i = ns.ns_ip.find(nam); | |
634 if (i != ns.ns_ip.end()) { | |
635 // we want this ip address | |
636 int address; | |
637 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); | |
638 ns.ns_ip[nam] = address; | |
639 } | |
640 } | |
641 } | |
642 } | |
643 int rrnum = 0; | |
644 while (ns_parserr(&handle, ns_s_an, rrnum++, &rr) == 0) { | |
645 if (ns_rr_type(rr) == ns_t_a) { | |
646 int address; | |
647 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); | |
648 ret_address = address; | |
649 } | |
650 } | |
651 } | |
652 } | |
653 pthread_mutex_unlock(&resolve_mutex); | |
654 return ret_address; | |
655 #else | |
656 return glom.answer; | |
657 #endif | |
658 } | |
659 | |
660 | |
661 //////////////////////////////////////////////// | |
662 // check a single dnsbl | |
663 // | |
664 bool check_single(mlfiPriv &priv, int ip, char *suffix); | |
665 bool check_single(mlfiPriv &priv, int ip, char *suffix) { | |
666 // make a dns question | |
667 const u_char *src = (const u_char *)&ip; | |
668 if (src[0] == 127) return false; // don't do dns lookups on localhost | |
126 | 669 if (src[0] == 10) return false; // don't do dns lookups on rfc1918 space |
670 if ((src[0] == 192) && (src[1] == 168)) return false; | |
671 if ((src[0] == 172) && (16 <= src[1]) && (src[1] <= 31)) return false; | |
94 | 672 #ifdef NS_MAXDNAME |
673 char question[NS_MAXDNAME]; | |
674 #else | |
675 char question[1000]; | |
676 #endif | |
677 snprintf(question, sizeof(question), "%u.%u.%u.%u.%s.", src[3], src[2], src[1], src[0], suffix); | |
678 // ask the question, if we get an A record it implies a blacklisted ip address | |
679 return dns_interface(priv, question, false, NULL); | |
680 } | |
681 | |
682 | |
683 //////////////////////////////////////////////// | |
684 // check a single dnsbl | |
685 // | |
686 bool check_single(mlfiPriv &priv, int ip, DNSBL &bl); | |
687 bool check_single(mlfiPriv &priv, int ip, DNSBL &bl) { | |
688 return check_single(priv, ip, bl.suffix); | |
689 } | |
690 | |
691 | |
692 //////////////////////////////////////////////// | |
693 // check the dnsbls specified for this recipient | |
694 // | |
695 bool check_dnsbl(mlfiPriv &priv, dnsblp_list &dnsbll, DNSBLP &rejectlist); | |
696 bool check_dnsbl(mlfiPriv &priv, dnsblp_list &dnsbll, DNSBLP &rejectlist) { | |
697 for (dnsblp_list::iterator i=dnsbll.begin(); i!=dnsbll.end(); i++) { | |
698 DNSBLP dp = *i; // non null by construction | |
699 bool st; | |
700 map<DNSBLP, bool>::iterator f = priv.checked.find(dp); | |
701 if (f == priv.checked.end()) { | |
702 // have not checked this list yet | |
703 st = check_single(priv, priv.ip, *dp); | |
704 rejectlist = dp; | |
705 priv.checked[dp] = st; | |
706 } | |
707 else { | |
708 st = (*f).second; | |
709 rejectlist = (*f).first; | |
710 } | |
711 if (st) return st; | |
712 } | |
713 return false; | |
714 } | |
715 | |
716 | |
717 //////////////////////////////////////////////// | |
134 | 718 // lookup the domain name part of a hostname on the uribl |
117 | 719 // |
124 | 720 // if we find part of the hostname on the uribl, return |
721 // true and point found to the part of the hostname that we found. | |
722 // otherwise, return false and preserve the value of found. | |
723 // | |
724 bool uriblookup(mlfiPriv &priv ,char *hostname, char *top, char *&found) ; | |
725 bool uriblookup(mlfiPriv &priv, char *hostname, char *top, char *&found) { | |
117 | 726 // top is pointer to '.' char at end of base domain, or null for ip address form |
727 // so for hostname of www.fred.mydomain.co.uk | |
728 // top points to-----------------------^ | |
729 // and we end up looking at only mydomain.co.uk, ignoring the www.fred stuff | |
730 char buf[maxlen]; | |
731 if (top) { | |
732 // add one more component | |
733 *top = '\0'; | |
734 char *x = strrchr(hostname, '.'); | |
735 if (x) hostname = x+1; | |
736 *top = '.'; | |
737 } | |
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738 snprintf(buf, sizeof(buf), "%s.%s.", hostname, priv.uribl_suffix); |
119 | 739 if (dns_interface(priv, buf, false, NULL)) { |
117 | 740 if (debug_syslog > 2) { |
741 char tmp[maxlen]; | |
119 | 742 snprintf(tmp, sizeof(tmp), "found %s on %s", hostname, priv.uribl_suffix); |
117 | 743 my_syslog(tmp); |
744 } | |
124 | 745 found = hostname; |
119 | 746 return true; |
117 | 747 } |
748 return false; | |
749 } | |
750 | |
751 | |
752 //////////////////////////////////////////////// | |
124 | 753 // uribl checker |
754 // ------------- | |
755 // hostname MUST not have a trailing dot | |
756 // If tld, two level lookup. | |
757 // Else, look up three level domain. | |
758 // | |
759 // if we find part of the hostname on the uribl, return | |
760 // true and point found to the part of the hostname that we found. | |
761 // otherwise, return false and preserve the value of found. | |
762 // | |
763 bool check_uribl(mlfiPriv &priv, char *hostname, char *&found) ; | |
764 bool check_uribl(mlfiPriv &priv, char *hostname, char *&found) { | |
117 | 765 in_addr ip; |
766 if (inet_aton(hostname, &ip)) { | |
120 | 767 const u_char *src = (const u_char *)&ip.s_addr; |
128 | 768 if (src[0] == 127) return false; // don't do dns lookups on localhost |
769 if (src[0] == 10) return false; // don't do dns lookups on rfc1918 space | |
770 if ((src[0] == 192) && (src[1] == 168)) return false; | |
771 if ((src[0] == 172) && (16 <= src[1]) && (src[1] <= 31)) return false; | |
124 | 772 static char adr[sizeof "255.255.255.255"]; |
120 | 773 snprintf(adr, sizeof(adr), "%u.%u.%u.%u", src[3], src[2], src[1], src[0]); |
124 | 774 return (uriblookup(priv, adr, NULL, found)); |
117 | 775 } |
776 | |
777 char *top, *top2, *top3; | |
778 top = strrchr(hostname, '.'); | |
779 if (top) { | |
780 *top = '\0'; | |
781 top2 = strrchr(hostname, '.'); | |
782 *top = '.'; | |
783 | |
784 if (top2) { | |
785 string_set::iterator i = priv.memory->get_cctlds()->find(top2+1); | |
786 string_set::iterator x = priv.memory->get_cctlds()->end(); | |
787 // if we have a 2-level-cctld, just look at top three levels of the name | |
124 | 788 if (i != x) return uriblookup(priv, hostname, top2, found); |
117 | 789 |
790 *top2 = '\0'; | |
791 top3 = strrchr(hostname, '.'); | |
792 *top2 = '.'; | |
793 | |
794 // if we have more than 3 levels in the name, look at the top three levels of the name | |
124 | 795 if (top3 && uriblookup(priv, hostname, top2, found)) return true; |
117 | 796 // if that was not found, fall thru to looking at the top two levels |
797 } | |
798 // look at the top two levels of the name | |
124 | 799 return uriblookup(priv, hostname, top, found); |
117 | 800 } |
801 return false; | |
802 } | |
803 | |
804 | |
805 //////////////////////////////////////////////// | |
119 | 806 // check the hosts from the body against the content filter and uribl dnsbls |
94 | 807 // |
124 | 808 // |
809 bool check_hosts(mlfiPriv &priv, bool random, int limit, char *&msg, char *&host, int &ip, char *&found); | |
810 bool check_hosts(mlfiPriv &priv, bool random, int limit, char *&msg, char *&host, int &ip, char *&found) { | |
811 found = NULL; // normally ip address style | |
119 | 812 if (!priv.content_suffix && !priv.uribl_suffix) return false; // nothing to check |
94 | 813 CONFIG &dc = *priv.pc; |
814 string_set &hosts = priv.memory->get_hosts(); | |
815 string_set &ignore = *priv.content_host_ignore; | |
816 | |
817 int count = 0; | |
818 int cnt = hosts.size(); // number of hosts we could look at | |
819 int_set ips; | |
820 ns_map nameservers; | |
821 for (string_set::iterator i=hosts.begin(); i!=hosts.end(); i++) { | |
822 host = *i; // a reference into hosts, which will live until this smtp transaction is closed | |
823 | |
824 // don't bother looking up hosts on the ignore list | |
825 string_set::iterator j = ignore.find(host); | |
826 if (j != ignore.end()) continue; | |
827 | |
828 // try to only look at limit/cnt fraction of the available cnt host names in random mode | |
829 if ((cnt > limit) && (limit > 0) && random) { | |
830 int r = rand() % cnt; | |
831 if (r >= limit) { | |
832 if (debug_syslog > 2) { | |
833 char buf[maxlen]; | |
834 snprintf(buf, sizeof(buf), "host %s skipped", host); | |
835 my_syslog(&priv, buf); | |
836 } | |
837 continue; | |
838 } | |
839 } | |
840 count++; | |
841 ip = dns_interface(priv, host, true, &nameservers); | |
842 if (debug_syslog > 2) { | |
843 char buf[maxlen]; | |
844 if (ip) { | |
845 char adr[sizeof "255.255.255.255"]; | |
846 adr[0] = '\0'; | |
847 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
848 snprintf(buf, sizeof(buf), "host %s found at %s", host, adr); | |
849 } | |
850 else { | |
851 snprintf(buf, sizeof(buf), "host %s not found", host); | |
852 } | |
853 my_syslog(&priv, buf); | |
854 } | |
855 if (ip) { | |
856 int_set::iterator i = ips.find(ip); | |
857 if (i == ips.end()) { | |
117 | 858 // we haven't looked this up yet |
94 | 859 ips.insert(ip); |
124 | 860 // check dnsbl style list |
861 if (priv.content_suffix && check_single(priv, ip, priv.content_suffix)) { | |
119 | 862 msg = priv.content_message; |
863 return true; | |
864 } | |
124 | 865 // Check uribl & surbl style list |
866 if (priv.uribl_suffix && check_uribl(priv, host, found)) { | |
119 | 867 msg = priv.uribl_message; |
868 return true; | |
869 } | |
94 | 870 } |
871 } | |
872 } | |
873 limit *= 4; // allow average of 3 ns per host name | |
874 for (ns_mapper::iterator i=nameservers.ns_ip.begin(); i!=nameservers.ns_ip.end(); i++) { | |
875 count++; | |
119 | 876 if ((count > limit) && (limit > 0)) return false; // too many name servers to check them all |
94 | 877 host = (*i).first; // a transient reference that needs to be replaced before we return it |
878 ip = (*i).second; | |
879 if (!ip) ip = dns_interface(priv, host, false, NULL); | |
880 if (debug_syslog > 2) { | |
881 char buf[maxlen]; | |
882 if (ip) { | |
883 char adr[sizeof "255.255.255.255"]; | |
884 adr[0] = '\0'; | |
885 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
886 snprintf(buf, sizeof(buf), "ns %s found at %s", host, adr); | |
887 } | |
888 else { | |
889 snprintf(buf, sizeof(buf), "ns %s not found", host); | |
890 } | |
891 my_syslog(&priv, buf); | |
892 } | |
893 if (ip) { | |
894 int_set::iterator i = ips.find(ip); | |
895 if (i == ips.end()) { | |
896 ips.insert(ip); | |
119 | 897 if (check_single(priv, ip, priv.content_suffix)) { |
898 msg = priv.content_message; | |
94 | 899 string_map::iterator j = nameservers.ns_host.find(host); |
900 if (j != nameservers.ns_host.end()) { | |
901 char *refer = (*j).second; | |
902 char buf[maxlen]; | |
903 snprintf(buf, sizeof(buf), "%s with nameserver %s", refer, host); | |
904 host = register_string(hosts, buf); // put a copy into hosts, and return that reference | |
905 } | |
906 else { | |
907 host = register_string(hosts, host); // put a copy into hosts, and return that reference | |
908 } | |
909 return true; | |
910 } | |
911 } | |
912 } | |
913 } | |
914 return false; | |
915 } | |
916 | |
127 | 917 |
94 | 918 //////////////////////////////////////////////// |
127 | 919 // |
920 // this email address is passed in from sendmail, and will normally be | |
921 // enclosed in <>. I think older versions of sendmail supplied the <> | |
922 // wrapper if the mail client did not, but the current version does not do | |
923 // that. So the <> wrapper is now optional. It may have mixed case, just | |
924 // as the mail client sent it. We dup the string and convert the duplicate | |
925 // to lower case. | |
94 | 926 // |
927 char *to_lower_string(char *email); | |
928 char *to_lower_string(char *email) { | |
127 | 929 int n = strlen(email); |
930 if (*email == '<') { | |
931 // assume it also ends with > | |
932 n -= 2; | |
933 if (n < 1) return strdup(email); // return "<>" | |
934 email++; | |
935 } | |
936 char *key = strdup(email); | |
94 | 937 key[n] = '\0'; |
938 for (int i=0; i<n; i++) key[i] = tolower(key[i]); | |
939 return key; | |
940 } | |
941 | |
942 | |
943 //////////////////////////////////////////////// | |
944 // start of sendmail milter interfaces | |
945 // | |
946 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr) | |
947 { | |
948 // allocate some private memory | |
949 mlfiPriv *priv = new mlfiPriv; | |
950 if (hostaddr->sa_family == AF_INET) { | |
951 priv->ip = ((struct sockaddr_in *)hostaddr)->sin_addr.s_addr; | |
952 } | |
953 // save the private data | |
954 smfi_setpriv(ctx, (void*)priv); | |
955 | |
956 // continue processing | |
957 return SMFIS_CONTINUE; | |
958 } | |
959 | |
163 | 960 sfsistat mlfi_helo(SMFICTX * ctx, char *helohost) |
961 { | |
962 mlfiPriv &priv = *MLFIPRIV; | |
963 priv.helo = strdup(helohost); | |
964 return SMFIS_CONTINUE; | |
965 } | |
966 | |
94 | 967 sfsistat mlfi_envfrom(SMFICTX *ctx, char **from) |
968 { | |
969 mlfiPriv &priv = *MLFIPRIV; | |
970 priv.mailaddr = to_lower_string(from[0]); | |
163 | 971 priv.queueid = strdup(smfi_getsymval(ctx, "i")); |
136 | 972 priv.authenticated = smfi_getsymval(ctx, "{auth_authen}"); |
168 | 973 priv.client_name = smfi_getsymval(ctx, "_"); |
136 | 974 if (priv.authenticated) priv.authenticated = strdup(priv.authenticated); |
168 | 975 if (priv.client_name) priv.client_name = strdup(priv.client_name); |
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976 if (spamc != spamc_empty) { |
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977 priv.assassin = new SpamAssassin(&priv, priv.ip, priv.helo, priv.mailaddr, priv.queueid); |
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978 } |
94 | 979 return SMFIS_CONTINUE; |
980 } | |
981 | |
982 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **rcpt) | |
983 { | |
984 DNSBLP rejectlist = NULL; // list that caused the reject | |
985 mlfiPriv &priv = *MLFIPRIV; | |
986 CONFIG &dc = *priv.pc; | |
152 | 987 char *rcptaddr = rcpt[0]; |
988 char *loto = to_lower_string(rcptaddr); | |
174 | 989 |
990 // some version of sendmail allowed rcpt to:<> and passed it thru to the milters | |
991 if (strcmp(loto, "<>") == 0) { | |
992 smfi_setreply(ctx, "550", "5.7.1", "bogus recipient"); | |
993 return SMFIS_REJECT; | |
994 } | |
995 | |
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996 if (priv.assassin) priv.assassin->mlfi_envrcpt(ctx, loto); |
152 | 997 // priv.mailaddr sending original message to loto |
998 CONTEXT &con = *(dc.find_context(loto)->find_context(priv.mailaddr)); | |
999 VERIFYP ver = con.find_verify(loto); | |
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1000 char *fromvalue = con.find_from(priv.mailaddr, true); |
152 | 1001 // loto sending a reply back to priv.mailaddr |
1002 CONTEXT &con2 = *(dc.find_context(priv.mailaddr)->find_context(loto)); | |
1003 char *replyvalue = con2.find_from(loto); | |
94 | 1004 if (debug_syslog > 1) { |
1005 char buf[maxlen]; | |
1006 char msg[maxlen]; | |
156 | 1007 snprintf(msg, sizeof(msg), "from <%s> to <%s> using context %s state %s reply state %s", priv.mailaddr, loto, con.get_full_name(buf,maxlen), fromvalue, replyvalue); |
94 | 1008 my_syslog(&priv, msg); |
1009 } | |
1010 free(loto); | |
1011 status st; | |
152 | 1012 if (replyvalue == token_black) { |
1013 smfi_setreply(ctx, "550", "5.7.1", "recipient can not reply due to blacklisting"); | |
1014 return SMFIS_REJECT; | |
1015 } | |
94 | 1016 if (priv.authenticated) { |
136 | 1017 int c = incr_rcpt_count(priv.authenticated); |
1018 int l = dc.default_context->find_rate(priv.authenticated); | |
142 | 1019 if (debug_syslog > 1) { |
1020 char buf[maxlen]; | |
1021 char msg[maxlen]; | |
1022 snprintf(msg, sizeof(msg), "authenticated id %s (%d recipients, %d limit)", priv.authenticated, c, l); | |
1023 my_syslog(&priv, msg); | |
1024 } | |
136 | 1025 if (c > l) { |
1026 smfi_setreply(ctx, "550", "5.7.1", "recipient rate limit exceeded"); | |
1027 return SMFIS_REJECT; | |
1028 } | |
142 | 1029 st = white; |
94 | 1030 } |
1031 else if (fromvalue == token_black) { | |
1032 st = black; | |
1033 } | |
1034 else if (fromvalue == token_white) { | |
1035 st = white; | |
1036 } | |
1037 else { | |
1038 // check the dns based lists | |
1039 st = (check_dnsbl(priv, con.get_dnsbl_list(), rejectlist)) ? reject : oksofar; | |
1040 } | |
1041 if (st == reject) { | |
1042 // reject the recipient based on some dnsbl | |
1043 char adr[sizeof "255.255.255.255"]; | |
1044 adr[0] = '\0'; | |
1045 inet_ntop(AF_INET, (const u_char *)&priv.ip, adr, sizeof(adr)); | |
1046 char buf[maxlen]; | |
1047 snprintf(buf, sizeof(buf), rejectlist->message, adr, adr); | |
1048 smfi_setreply(ctx, "550", "5.7.1", buf); | |
1049 return SMFIS_REJECT; | |
1050 } | |
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1051 if (st == oksofar) { |
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1052 char *msg = con.generic_match(priv.client_name); |
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1053 if (msg) { |
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1054 // reject the recipient based on generic reverse dns |
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1055 char buf[maxlen]; |
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1056 snprintf(buf, sizeof(buf), msg, priv.client_name); |
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1057 smfi_setreply(ctx, "550", "5.7.1", buf); |
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1058 return SMFIS_REJECT; |
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1059 } |
168 | 1060 } |
94 | 1061 if (st == black) { |
1062 // reject the recipient based on blacklisting either from or to | |
1063 smfi_setreply(ctx, "550", "5.7.1", "no such user"); | |
1064 return SMFIS_REJECT; | |
1065 } | |
1066 if (ver && (st != white)) { | |
1067 // try to verify this from/to pair of addresses since it is not explicitly whitelisted | |
1068 char *loto = to_lower_string(rcptaddr); | |
1069 bool rc = ver->ok(priv.mailaddr, loto); | |
1070 free(loto); | |
1071 if (!rc) { | |
1072 smfi_setreply(ctx, "550", "5.7.1", "no such user"); | |
1073 return SMFIS_REJECT; | |
1074 } | |
1075 } | |
153 | 1076 // we will accept the recipient, but add an auto-whitelist entry |
1077 // if needed to ensure we can accept replies | |
162 | 1078 loto = to_lower_string(rcptaddr); |
1079 WHITELISTERP w = con2.find_autowhite(loto, priv.mailaddr); | |
153 | 1080 if (w) { |
156 | 1081 if (debug_syslog > 1) { |
1082 char buf[maxlen]; | |
1083 char msg[maxlen]; | |
159 | 1084 snprintf(msg, sizeof(msg), "whitelist reply from <%s> in context %s", loto, con2.get_full_name(buf,maxlen)); |
156 | 1085 my_syslog(&priv, msg); |
1086 } | |
154 | 1087 w->sent(loto); // don't free it, the whitelister takes ownership of the string |
153 | 1088 } |
162 | 1089 else { |
1090 free(loto); | |
1091 } | |
94 | 1092 // accept the recipient |
1093 if (!con.get_content_filtering()) st = white; | |
1094 if (st == oksofar) { | |
1095 // but remember the non-whites | |
1096 priv.need_content_filter(rcptaddr, con); | |
1097 priv.only_whites = false; | |
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1098 priv.want_spamassassin |= (priv.assassin) && // have spam assassin available and |
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1099 (con.get_spamassassin_limit() != 0); // want to use it with a non-zero score |
94 | 1100 } |
1101 if (st == white) { | |
1102 priv.have_whites = true; | |
1103 } | |
1104 return SMFIS_CONTINUE; | |
1105 } | |
1106 | |
163 | 1107 sfsistat mlfi_header(SMFICTX* ctx, char* headerf, char* headerv) |
1108 { | |
1109 mlfiPriv &priv = *MLFIPRIV; | |
167
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1110 if (priv.authenticated) return SMFIS_CONTINUE; |
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1111 if (priv.only_whites) return SMFIS_CONTINUE; |
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1112 if (priv.want_spamassassin) priv.assassin->mlfi_header(headerf, headerv); |
163 | 1113 return SMFIS_CONTINUE; |
1114 } | |
1115 | |
1116 sfsistat mlfi_eoh(SMFICTX* ctx) | |
1117 { | |
1118 mlfiPriv &priv = *MLFIPRIV; | |
167
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1119 if (priv.authenticated) return SMFIS_CONTINUE; |
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1120 if (priv.only_whites) return SMFIS_CONTINUE; |
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1121 if (priv.want_spamassassin) priv.assassin->mlfi_eoh(); |
163 | 1122 return SMFIS_CONTINUE; |
1123 } | |
1124 | |
94 | 1125 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len) |
1126 { | |
1127 mlfiPriv &priv = *MLFIPRIV; | |
167
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1128 if (priv.authenticated) return SMFIS_CONTINUE; |
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1129 if (priv.only_whites) return SMFIS_CONTINUE; |
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1130 if (priv.want_spamassassin) priv.assassin->mlfi_body(data, len); |
94 | 1131 priv.scanner->scan(data, len); |
1132 return SMFIS_CONTINUE; | |
1133 } | |
1134 | |
1135 sfsistat mlfi_eom(SMFICTX *ctx) | |
1136 { | |
1137 sfsistat rc; | |
1138 mlfiPriv &priv = *MLFIPRIV; | |
1139 CONFIG &dc = *priv.pc; | |
1140 char *host = NULL; | |
1141 int ip; | |
1142 status st; | |
1143 // process end of message | |
1144 if (priv.authenticated || priv.only_whites) rc = SMFIS_CONTINUE; | |
1145 else { | |
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1146 int score = (priv.want_spamassassin) ? priv.assassin->mlfi_eom() : 0; |
94 | 1147 // assert env_to not empty |
1148 char buf[maxlen]; | |
167
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1149 string msg; |
94 | 1150 string_set alive; |
1151 bool random = false; | |
1152 int limit = 0; | |
1153 for (context_map::iterator i=priv.env_to.begin(); i!=priv.env_to.end(); i++) { | |
1154 char *rcpt = (*i).first; | |
1155 CONTEXT &con = *((*i).second); | |
163 | 1156 if (!con.acceptable_content(*priv.memory, score, msg)) { |
1157 // bad html tags or excessive hosts or high spam assassin score | |
94 | 1158 smfi_delrcpt(ctx, rcpt); |
1159 } | |
1160 else { | |
1161 alive.insert(rcpt); | |
1162 random |= con.get_host_random(); | |
1163 limit = max(limit, con.get_host_limit()); | |
1164 } | |
1165 } | |
1166 bool rejecting = alive.empty(); // if alive is empty, we must have set msg above in acceptable_content() | |
1167 if (!rejecting) { | |
124 | 1168 char *fmt, *found; |
1169 if (check_hosts(priv, random, limit, fmt, host, ip, found)) { | |
1170 if (found) { | |
1171 // uribl style | |
1172 snprintf(buf, sizeof(buf), fmt, host, found); | |
1173 } | |
1174 else { | |
1175 // dnsbl style | |
1176 char adr[sizeof "255.255.255.255"]; | |
1177 adr[0] = '\0'; | |
1178 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
1179 snprintf(buf, sizeof(buf), fmt, host, adr); | |
1180 } | |
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1181 msg = string(buf); |
94 | 1182 rejecting = true; |
1183 } | |
1184 } | |
1185 if (!rejecting) { | |
1186 rc = SMFIS_CONTINUE; | |
1187 } | |
1188 else if (!priv.have_whites) { | |
1189 // can reject the entire message | |
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1190 snprintf(buf, sizeof(buf), "%s", msg.c_str()); |
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1191 smfi_setreply(ctx, "550", "5.7.1", buf); |
94 | 1192 rc = SMFIS_REJECT; |
1193 } | |
1194 else { | |
1195 // need to accept it but remove the recipients that don't want it | |
1196 for (string_set::iterator i=alive.begin(); i!=alive.end(); i++) { | |
1197 char *rcpt = *i; | |
1198 smfi_delrcpt(ctx, rcpt); | |
1199 } | |
1200 rc = SMFIS_CONTINUE; | |
1201 } | |
1202 } | |
1203 // reset for a new message on the same connection | |
1204 mlfi_abort(ctx); | |
1205 return rc; | |
1206 } | |
1207 | |
1208 sfsistat mlfi_abort(SMFICTX *ctx) | |
1209 { | |
1210 mlfiPriv &priv = *MLFIPRIV; | |
1211 priv.reset(); | |
1212 return SMFIS_CONTINUE; | |
1213 } | |
1214 | |
1215 sfsistat mlfi_close(SMFICTX *ctx) | |
1216 { | |
1217 mlfiPriv *priv = MLFIPRIV; | |
1218 if (!priv) return SMFIS_CONTINUE; | |
1219 delete priv; | |
1220 smfi_setpriv(ctx, NULL); | |
1221 return SMFIS_CONTINUE; | |
1222 } | |
1223 | |
1224 struct smfiDesc smfilter = | |
1225 { | |
1226 "DNSBL", // filter name | |
1227 SMFI_VERSION, // version code -- do not change | |
1228 SMFIF_DELRCPT, // flags | |
1229 mlfi_connect, // connection info filter | |
163 | 1230 mlfi_helo, // SMTP HELO command filter |
94 | 1231 mlfi_envfrom, // envelope sender filter |
1232 mlfi_envrcpt, // envelope recipient filter | |
163 | 1233 mlfi_header, // header filter |
1234 mlfi_eoh, // end of header | |
94 | 1235 mlfi_body, // body block filter |
1236 mlfi_eom, // end of message | |
1237 mlfi_abort, // message aborted | |
1238 mlfi_close, // connection cleanup | |
1239 }; | |
1240 | |
1241 | |
1242 //////////////////////////////////////////////// | |
1243 // reload the config | |
1244 // | |
1245 CONFIG* new_conf(); | |
1246 CONFIG* new_conf() { | |
1247 CONFIG *newc = new CONFIG; | |
1248 pthread_mutex_lock(&config_mutex); | |
1249 newc->generation = generation++; | |
1250 pthread_mutex_unlock(&config_mutex); | |
1251 if (debug_syslog) { | |
1252 char buf[maxlen]; | |
1253 snprintf(buf, sizeof(buf), "loading configuration generation %d", newc->generation); | |
1254 my_syslog(buf); | |
1255 } | |
1256 if (load_conf(*newc, "dnsbl.conf")) { | |
1257 newc->load_time = time(NULL); | |
1258 return newc; | |
1259 } | |
1260 delete newc; | |
1261 return NULL; | |
1262 } | |
1263 | |
1264 | |
1265 //////////////////////////////////////////////// | |
1266 // thread to watch the old config files for changes | |
146 | 1267 // and reload when needed. |
136 | 1268 // we also clear the SMTP AUTH recipient counts hourly |
94 | 1269 // |
163 | 1270 extern "C" {void* config_loader(void *arg);} |
94 | 1271 void* config_loader(void *arg) { |
136 | 1272 int loop = 0; |
94 | 1273 while (loader_run) { |
1274 sleep(180); // look for modifications every 3 minutes | |
1275 if (!loader_run) break; | |
136 | 1276 loop++; |
1277 if (loop == 20) { | |
1278 // three minutes thru each loop, 20 loops per hour | |
1279 // clear the recipient counts | |
1280 pthread_mutex_lock(&rate_mutex); | |
138 | 1281 for (rcpt_rates::iterator i=rcpt_counts.begin(); i!=rcpt_counts.end(); i++) { |
140 | 1282 (*i).second = 0; |
138 | 1283 } |
136 | 1284 pthread_mutex_unlock(&rate_mutex); |
137 | 1285 loop = 0; |
136 | 1286 } |
94 | 1287 CONFIG &dc = *config; |
1288 time_t then = dc.load_time; | |
1289 struct stat st; | |
1290 bool reload = false; | |
1291 for (string_set::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
1292 char *fn = *i; | |
1293 if (stat(fn, &st)) reload = true; // file disappeared | |
1294 else if (st.st_mtime > then) reload = true; // file modified | |
1295 if (reload) break; | |
1296 } | |
1297 if (reload) { | |
1298 CONFIG *newc = new_conf(); | |
1299 if (newc) { | |
1300 // replace the global config pointer | |
1301 pthread_mutex_lock(&config_mutex); | |
146 | 1302 CONFIG *pc = config; |
1303 bool last = pc && (!pc->reference_count); | |
94 | 1304 config = newc; |
1305 pthread_mutex_unlock(&config_mutex); | |
163 | 1306 if (last) delete pc; // there were no references to this config |
94 | 1307 } |
1308 else { | |
1309 // failed to load new config | |
1310 my_syslog("failed to load new configuration"); | |
1311 system("echo 'failed to load new dnsbl configuration from /etc/dnsbl' | mail -s 'error in /etc/dnsbl configuration' root"); | |
1312 // update the load time on the current config to prevent complaining every 3 minutes | |
1313 dc.load_time = time(NULL); | |
1314 } | |
1315 } | |
1316 } | |
1317 return NULL; | |
1318 } | |
1319 | |
1320 | |
1321 void usage(char *prog); | |
1322 void usage(char *prog) | |
1323 { | |
177 | 1324 fprintf(stderr, "Usage: %s [-d [level]] [-c] [-s] [-e from|to] [-b dccifd-addr] -r port -p sm-sock-addr [-t timeout]\n", prog); |
1325 fprintf(stderr, "where dccifd_addr is for the connection to dccifd\n"); | |
1326 fprintf(stderr, " and should be local-domain-socket-file-name\n"); | |
94 | 1327 fprintf(stderr, "where port is for the connection to our own dns resolver processes\n"); |
1328 fprintf(stderr, " and should be local-domain-socket-file-name\n"); | |
1329 fprintf(stderr, "where sm-sock-addr is for the connection to sendmail\n"); | |
1330 fprintf(stderr, " and should be one of\n"); | |
1331 fprintf(stderr, " inet:port@ip-address\n"); | |
1332 fprintf(stderr, " local:local-domain-socket-file-name\n"); | |
1333 fprintf(stderr, "-c will load and dump the config to stdout\n"); | |
1334 fprintf(stderr, "-s will stress test the config loading code by repeating the load/free cycle\n"); | |
1335 fprintf(stderr, " in an infinte loop.\n"); | |
1336 fprintf(stderr, "-d will set the syslog message level, currently 0 to 3\n"); | |
1337 fprintf(stderr, "-e will print the results of looking up the from and to addresses in the\n"); | |
1338 fprintf(stderr, " current config. The | character is used to separate the from and to\n"); | |
1339 fprintf(stderr, " addresses in the argument to the -e switch\n"); | |
1340 } | |
1341 | |
1342 | |
1343 | |
1344 void setup_socket(char *sock); | |
1345 void setup_socket(char *sock) { | |
1346 unlink(sock); | |
1347 } | |
1348 | |
1349 | |
1350 /* | |
1351 * The signal handler function -- only gets called when a SIGCHLD | |
1352 * is received, ie when a child terminates | |
1353 */ | |
1354 void sig_chld(int signo) | |
1355 { | |
1356 int status; | |
1357 /* Wait for any child without blocking */ | |
1358 while (waitpid(-1, &status, WNOHANG) > 0) { | |
1359 // ignore child exit status, we only do this to cleanup zombies | |
1360 } | |
1361 } | |
1362 | |
1363 | |
1364 int main(int argc, char**argv) | |
1365 { | |
1366 token_init(); | |
1367 bool check = false; | |
1368 bool stress = false; | |
1369 bool setconn = false; | |
1370 bool setreso = false; | |
1371 char *email = NULL; | |
1372 int c; | |
177 | 1373 const char *args = "b:r:p:t:e:d:chs"; |
94 | 1374 extern char *optarg; |
1375 | |
1376 // Process command line options | |
1377 while ((c = getopt(argc, argv, args)) != -1) { | |
1378 switch (c) { | |
177 | 1379 case 'b': |
1380 if (optarg == NULL || *optarg == '\0') { | |
1381 fprintf(stderr, "Illegal dccifd socket: %s\n", optarg); | |
1382 exit(EX_USAGE); | |
1383 } | |
1384 dccifd_port = strdup(optarg); | |
1385 break; | |
1386 | |
94 | 1387 case 'r': |
1388 if (optarg == NULL || *optarg == '\0') { | |
1389 fprintf(stderr, "Illegal resolver socket: %s\n", optarg); | |
1390 exit(EX_USAGE); | |
1391 } | |
1392 resolver_port = strdup(optarg); | |
1393 setup_socket(resolver_port); | |
1394 setreso = true; | |
1395 break; | |
1396 | |
1397 case 'p': | |
1398 if (optarg == NULL || *optarg == '\0') { | |
1399 fprintf(stderr, "Illegal sendmail socket: %s\n", optarg); | |
1400 exit(EX_USAGE); | |
1401 } | |
1402 if (smfi_setconn(optarg) == MI_FAILURE) { | |
1403 fprintf(stderr, "smfi_setconn failed\n"); | |
1404 exit(EX_SOFTWARE); | |
1405 } | |
1406 if (strncasecmp(optarg, "unix:", 5) == 0) setup_socket(optarg + 5); | |
1407 else if (strncasecmp(optarg, "local:", 6) == 0) setup_socket(optarg + 6); | |
1408 setconn = true; | |
1409 break; | |
1410 | |
1411 case 't': | |
1412 if (optarg == NULL || *optarg == '\0') { | |
1413 fprintf(stderr, "Illegal timeout: %s\n", optarg); | |
1414 exit(EX_USAGE); | |
1415 } | |
1416 if (smfi_settimeout(atoi(optarg)) == MI_FAILURE) { | |
1417 fprintf(stderr, "smfi_settimeout failed\n"); | |
1418 exit(EX_SOFTWARE); | |
1419 } | |
1420 break; | |
1421 | |
1422 case 'e': | |
1423 if (email) free(email); | |
1424 email = strdup(optarg); | |
1425 break; | |
1426 | |
1427 case 'c': | |
1428 check = true; | |
1429 break; | |
1430 | |
1431 case 's': | |
1432 stress = true; | |
1433 break; | |
1434 | |
1435 case 'd': | |
1436 if (optarg == NULL || *optarg == '\0') debug_syslog = 1; | |
1437 else debug_syslog = atoi(optarg); | |
1438 break; | |
1439 | |
1440 case 'h': | |
1441 default: | |
1442 usage(argv[0]); | |
1443 exit(EX_USAGE); | |
1444 } | |
1445 } | |
1446 | |
1447 if (check) { | |
1448 use_syslog = false; | |
1449 debug_syslog = 10; | |
1450 CONFIG *conf = new_conf(); | |
1451 if (conf) { | |
1452 conf->dump(); | |
1453 delete conf; | |
164 | 1454 clear_strings(); // for valgrind checking |
94 | 1455 return 0; |
1456 } | |
1457 else { | |
1458 return 1; // config failed to load | |
1459 } | |
1460 } | |
1461 | |
1462 if (stress) { | |
1463 fprintf(stdout, "stress testing\n"); | |
1464 while (1) { | |
1465 for (int i=0; i<10; i++) { | |
1466 CONFIG *conf = new_conf(); | |
1467 if (conf) delete conf; | |
1468 } | |
1469 fprintf(stdout, "."); | |
1470 fflush(stdout); | |
1471 sleep(1); | |
1472 } | |
1473 } | |
1474 | |
1475 if (email) { | |
1476 char *x = strchr(email, '|'); | |
1477 if (x) { | |
1478 *x = '\0'; | |
1479 char *from = strdup(email); | |
1480 char *to = strdup(x+1); | |
1481 use_syslog = false; | |
1482 CONFIG *conf = new_conf(); | |
1483 if (conf) { | |
1484 CONTEXTP con = conf->find_context(to); | |
1485 char buf[maxlen]; | |
1486 fprintf(stdout, "envelope to <%s> finds context %s\n", to, con->get_full_name(buf,maxlen)); | |
1487 CONTEXTP fc = con->find_context(from); | |
1488 fprintf(stdout, "envelope from <%s> finds context %s\n", from, fc->get_full_name(buf,maxlen)); | |
1489 char *st = fc->find_from(from); | |
1490 fprintf(stdout, "envelope from <%s> finds status %s\n", from, st); | |
1491 delete conf; | |
1492 } | |
1493 } | |
1494 return 0; | |
1495 } | |
1496 | |
1497 if (!setconn) { | |
1498 fprintf(stderr, "%s: Missing required -p argument\n", argv[0]); | |
1499 usage(argv[0]); | |
1500 exit(EX_USAGE); | |
1501 } | |
1502 | |
1503 if (!setreso) { | |
1504 fprintf(stderr, "%s: Missing required -r argument\n", argv[0]); | |
1505 usage(argv[0]); | |
1506 exit(EX_USAGE); | |
1507 } | |
1508 | |
1509 if (smfi_register(smfilter) == MI_FAILURE) { | |
1510 fprintf(stderr, "smfi_register failed\n"); | |
1511 exit(EX_UNAVAILABLE); | |
1512 } | |
1513 | |
1514 // switch to background mode | |
1515 if (daemon(1,0) < 0) { | |
1516 fprintf(stderr, "daemon() call failed\n"); | |
1517 exit(EX_UNAVAILABLE); | |
1518 } | |
1519 | |
1520 // write the pid | |
1521 const char *pidpath = "/var/run/dnsbl.pid"; | |
1522 unlink(pidpath); | |
1523 FILE *f = fopen(pidpath, "w"); | |
1524 if (f) { | |
1525 #ifdef linux | |
1526 // from a comment in the DCC source code: | |
1527 // Linux threads are broken. Signals given the | |
1528 // original process are delivered to only the | |
1529 // thread that happens to have that PID. The | |
1530 // sendmail libmilter thread that needs to hear | |
1531 // SIGINT and other signals does not, and that breaks | |
1532 // scripts that need to stop milters. | |
1533 // However, signaling the process group works. | |
1534 fprintf(f, "-%d\n", (u_int)getpgrp()); | |
1535 #else | |
1536 fprintf(f, "%d\n", (u_int)getpid()); | |
1537 #endif | |
1538 fclose(f); | |
1539 } | |
1540 | |
1541 // initialize the thread sync objects | |
1542 pthread_mutex_init(&config_mutex, 0); | |
1543 pthread_mutex_init(&syslog_mutex, 0); | |
1544 pthread_mutex_init(&resolve_mutex, 0); | |
1545 pthread_mutex_init(&fd_pool_mutex, 0); | |
153 | 1546 pthread_mutex_init(&verifier_mutex, 0); |
1547 pthread_mutex_init(&whitelister_mutex, 0); | |
94 | 1548 |
1549 // drop root privs | |
1550 struct passwd *pw = getpwnam("dnsbl"); | |
1551 if (pw) { | |
1552 if (setgid(pw->pw_gid) == -1) { | |
1553 my_syslog("failed to switch to group dnsbl"); | |
1554 } | |
1555 if (setuid(pw->pw_uid) == -1) { | |
1556 my_syslog("failed to switch to user dnsbl"); | |
1557 } | |
1558 } | |
1559 | |
1560 // load the initial config | |
1561 config = new_conf(); | |
1562 if (!config) { | |
1563 my_syslog("failed to load initial configuration, quitting"); | |
1564 exit(1); | |
1565 } | |
1566 | |
1567 // fork off the resolver listener process | |
1568 pid_t child = fork(); | |
1569 if (child < 0) { | |
1570 my_syslog("failed to create resolver listener process"); | |
1571 exit(0); | |
1572 } | |
1573 if (child == 0) { | |
1574 // we are the child - dns resolver listener process | |
1575 resolver_socket = socket(AF_UNIX, SOCK_STREAM, 0); | |
1576 if (resolver_socket < 0) { | |
1577 my_syslog("child failed to create resolver socket"); | |
1578 exit(0); // failed | |
1579 } | |
1580 sockaddr_un server; | |
1581 memset(&server, '\0', sizeof(server)); | |
1582 server.sun_family = AF_UNIX; | |
1583 strncpy(server.sun_path, resolver_port, sizeof(server.sun_path)-1); | |
1584 //try to bind the address to the socket. | |
1585 if (bind(resolver_socket, (sockaddr *)&server, sizeof(server)) < 0) { | |
1586 // bind failed | |
1587 shutdown(resolver_socket, SHUT_RDWR); | |
1588 close(resolver_socket); | |
1589 my_syslog("child failed to bind resolver socket"); | |
1590 exit(0); // failed | |
1591 } | |
1592 //listen on the socket. | |
1593 if (listen(resolver_socket, 10) < 0) { | |
1594 // listen failed | |
1595 shutdown(resolver_socket, SHUT_RDWR); | |
1596 close(resolver_socket); | |
1597 my_syslog("child failed to listen to resolver socket"); | |
1598 exit(0); // failed | |
1599 } | |
1600 // setup sigchld handler to prevent zombies | |
1601 struct sigaction act; | |
1602 act.sa_handler = sig_chld; // Assign sig_chld as our SIGCHLD handler | |
1603 sigemptyset(&act.sa_mask); // We don't want to block any other signals in this example | |
1604 act.sa_flags = SA_NOCLDSTOP; // only want children that have terminated | |
1605 if (sigaction(SIGCHLD, &act, NULL) < 0) { | |
1606 my_syslog("child failed to setup SIGCHLD handler"); | |
1607 exit(0); // failed | |
1608 } | |
1609 while (true) { | |
1610 sockaddr_un client; | |
1611 socklen_t clientlen = sizeof(client); | |
1612 int s = accept(resolver_socket, (sockaddr *)&client, &clientlen); | |
1613 if (s > 0) { | |
1614 // accept worked, it did not get cancelled before we could accept it | |
1615 // fork off a process to handle this connection | |
1616 int newchild = fork(); | |
1617 if (newchild == 0) { | |
1618 // this is the worker process | |
1619 // child does not need the listening socket | |
1620 close(resolver_socket); | |
1621 process_resolver_requests(s); | |
1622 exit(0); | |
1623 } | |
1624 else { | |
1625 // this is the parent | |
1626 // parent does not need the accepted socket | |
1627 close(s); | |
1628 } | |
1629 } | |
1630 } | |
1631 exit(0); // make sure we don't fall thru. | |
1632 } | |
1633 else { | |
1634 sleep(2); // allow child to get started | |
1635 } | |
1636 | |
1637 // only create threads after the fork() in daemon | |
1638 pthread_t tid; | |
1639 if (pthread_create(&tid, 0, config_loader, 0)) | |
1640 my_syslog("failed to create config loader thread"); | |
1641 if (pthread_detach(tid)) | |
1642 my_syslog("failed to detach config loader thread"); | |
153 | 1643 |
94 | 1644 if (pthread_create(&tid, 0, verify_closer, 0)) |
1645 my_syslog("failed to create verify closer thread"); | |
1646 if (pthread_detach(tid)) | |
1647 my_syslog("failed to detach verify closer thread"); | |
1648 | |
153 | 1649 if (pthread_create(&tid, 0, whitelister_writer, 0)) |
1650 my_syslog("failed to create autowhite writer thread"); | |
1651 if (pthread_detach(tid)) | |
1652 my_syslog("failed to detach autowhite writer thread"); | |
1653 | |
94 | 1654 time_t starting = time(NULL); |
1655 int rc = smfi_main(); | |
1656 if ((rc != MI_SUCCESS) && (time(NULL) > starting+5*60)) { | |
1657 my_syslog("trying to restart after smfi_main()"); | |
1658 loader_run = false; // eventually the config loader thread will terminate | |
1659 execvp(argv[0], argv); | |
1660 } | |
1661 exit((rc == MI_SUCCESS) ? 0 : EX_UNAVAILABLE); | |
1662 } | |
1663 |