Mercurial > dnsbl
annotate src/dnsbl.cpp @ 177:a4d313c2460b
start embedded dcc filtering
| author | carl |
|---|---|
| date | Sun, 30 Sep 2007 10:27:14 -0700 |
| parents | da0c41b9f672 |
| children | d6531c702be3 |
| rev | line source |
|---|---|
| 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" { | |
|
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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; | |
|
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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; | |
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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; | |
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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]; | |
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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 |