Mercurial > dnsbl
annotate src/dnsbl.cpp @ 23:06de5ab6a232
add url decoding stage, allow http:/ single / in yahoo redirector, allow ip address hostnames
| author | carl |
|---|---|
| date | Wed, 12 May 2004 13:23:22 -0700 |
| parents | c21b888cc175 |
| children | 2e23b7184d2b |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 | |
| 3 Copyright (c) 2004 Carl Byington - 510 Software Group, released under | |
| 4 the GPL version 2 or any later version at your choice available at | |
| 5 http://www.fsf.org/licenses/gpl.txt | |
| 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 | |
| 10 -p port The port through which the MTA will connect to this milter. | |
| 11 -t sec The timeout value. | |
| 9 | 12 -c Check the config, and print a copy to stdout. Don't start the |
| 4 | 13 milter or do anything with the socket. |
| 16 | 14 -d Add debug syslog entries |
| 15 | |
| 0 | 16 |
| 13 | 17 TODO: |
| 18 1) Add config for max_recipients for each mail domain. Recipients in | |
| 19 excess of that limit will be rejected, and the entire data will be | |
| 20 rejected if it is sent. | |
| 21 | |
| 22 2) Add config for poison addresses. If any recipient is poison, all | |
| 23 recipients are rejected even if they would be whitelisted, and the | |
| 24 data is rejected if sent. | |
| 25 | |
| 0 | 26 */ |
| 27 | |
| 28 | |
| 29 // from sendmail sample | |
| 30 #include <sys/types.h> | |
| 31 #include <sys/stat.h> | |
| 32 #include <errno.h> | |
| 33 #include <sysexits.h> | |
| 34 #include <unistd.h> | |
| 35 | |
| 36 // needed for socket io | |
| 37 #include <sys/ioctl.h> | |
| 38 #include <net/if.h> | |
| 39 #include <arpa/inet.h> | |
| 40 #include <netinet/in.h> | |
| 41 #include <netinet/tcp.h> | |
| 42 #include <netdb.h> | |
| 43 #include <sys/socket.h> | |
| 44 | |
| 45 // needed for thread | |
| 46 #include <pthread.h> | |
| 47 | |
| 48 // needed for std c++ collections | |
| 49 #include <set> | |
| 50 #include <map> | |
| 51 #include <list> | |
| 52 | |
| 53 // for the dns resolver | |
| 54 #include <netinet/in.h> | |
| 55 #include <arpa/nameser.h> | |
| 56 #include <resolv.h> | |
| 57 | |
| 58 // misc stuff needed here | |
| 59 #include <ctype.h> | |
| 60 #include <fstream> | |
| 61 #include <syslog.h> | |
| 62 | |
| 8 | 63 static char* dnsbl_version="$Id$"; |
| 0 | 64 |
| 8 | 65 #define DEFAULT "default" |
| 66 #define WHITE "white" | |
| 67 #define BLACK "black" | |
| 68 #define OK "ok" | |
| 69 #define MANY "many" | |
| 70 | |
| 71 enum status {oksofar, // not rejected yet | |
| 72 white, // whitelisted by envelope from | |
| 73 black, // blacklisted by envelope from or to | |
| 74 reject}; // rejected by a dns list | |
| 1 | 75 |
| 0 | 76 using namespace std; |
| 77 | |
| 78 extern "C" { | |
| 79 #include "libmilter/mfapi.h" | |
| 80 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr); | |
| 81 sfsistat mlfi_envfrom(SMFICTX *ctx, char **argv); | |
| 82 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **argv); | |
| 8 | 83 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len); |
| 84 sfsistat mlfi_eom(SMFICTX *ctx); | |
| 85 sfsistat mlfi_abort(SMFICTX *ctx); | |
| 0 | 86 sfsistat mlfi_close(SMFICTX *ctx); |
| 87 } | |
| 88 | |
| 89 struct ltstr { | |
| 90 bool operator()(char* s1, char* s2) const { | |
| 91 return strcmp(s1, s2) < 0; | |
| 92 } | |
| 93 }; | |
| 94 | |
| 95 struct DNSBL { | |
| 96 char *suffix; // blacklist suffix like blackholes.five-ten-sg.com | |
| 97 char *message; // error message with one or two %s operators for the ip address replacement | |
| 98 DNSBL(char *s, char *m); | |
| 99 }; | |
| 100 DNSBL::DNSBL(char *s, char *m) { | |
| 101 suffix = s; | |
| 102 message = m; | |
| 103 } | |
| 104 | |
| 105 typedef DNSBL * DNSBLP; | |
| 106 typedef list<DNSBLP> DNSBLL; | |
| 107 typedef DNSBLL * DNSBLLP; | |
| 108 typedef map<char *, char *, ltstr> string_map; | |
| 109 typedef map<char *, string_map *, ltstr> from_map; | |
| 110 typedef map<char *, DNSBLP, ltstr> dnsblp_map; | |
| 111 typedef map<char *, DNSBLLP, ltstr> dnsbllp_map; | |
| 112 typedef set<char *, ltstr> string_set; | |
| 113 typedef list<char *> string_list; | |
| 114 | |
| 115 struct CONFIG { | |
| 116 // the only mutable stuff once it has been loaded from the config file | |
| 117 int reference_count; // protected by the global config_mutex | |
| 118 // all the rest is constant after loading from the config file | |
| 119 time_t load_time; | |
| 120 string_list config_files; | |
| 121 dnsblp_map dnsbls; | |
| 122 dnsbllp_map dnsblls; | |
| 123 from_map env_from; | |
| 124 string_map env_to_dnsbll; // map recipient to a named dnsbll | |
| 125 string_map env_to_chkfrom; // map recipient to a named from map | |
| 8 | 126 char * content_suffix; // for sbl url body filtering |
| 9 | 127 char * content_message; // "" |
| 0 | 128 CONFIG(); |
| 129 ~CONFIG(); | |
| 130 }; | |
| 131 CONFIG::CONFIG() { | |
| 132 reference_count = 0; | |
| 133 load_time = 0; | |
| 8 | 134 content_suffix = NULL; |
| 135 content_message = NULL; | |
| 0 | 136 } |
| 137 CONFIG::~CONFIG() { | |
| 138 for (dnsblp_map::iterator i=dnsbls.begin(); i!=dnsbls.end(); i++) { | |
| 139 DNSBLP d = (*i).second; | |
| 140 delete d; | |
| 141 } | |
| 142 for (dnsbllp_map::iterator i=dnsblls.begin(); i!=dnsblls.end(); i++) { | |
| 143 DNSBLLP d = (*i).second; | |
| 144 delete d; | |
| 145 } | |
| 146 for (from_map::iterator i=env_from.begin(); i!=env_from.end(); i++) { | |
| 147 string_map *d = (*i).second; | |
| 148 delete d; | |
| 149 } | |
| 150 } | |
| 151 | |
| 16 | 152 static bool debug_syslog = false; |
| 18 | 153 static bool loader_run = true; // used to stop the config loader thread |
| 0 | 154 static string_set all_strings; // owns all the strings, only modified by the config loader thread |
| 155 static CONFIG * config = NULL; // protected by the config_mutex | |
| 156 | |
| 157 static pthread_mutex_t config_mutex; | |
| 158 static pthread_mutex_t syslog_mutex; | |
| 159 static pthread_mutex_t resolve_mutex; | |
| 160 | |
| 161 | |
| 162 //////////////////////////////////////////////// | |
| 8 | 163 // helper to discard the strings held by a string_set |
| 0 | 164 // |
| 9 | 165 static void discard(string_set &s); |
| 166 static void discard(string_set &s) { | |
| 8 | 167 for (string_set::iterator i=s.begin(); i!=s.end(); i++) { |
| 168 free(*i); | |
| 169 } | |
| 9 | 170 s.clear(); |
| 8 | 171 } |
| 0 | 172 |
| 12 | 173 //////////////////////////////////////////////// |
| 174 // helper to register a string in a string set | |
| 175 // | |
| 176 static char* register_string(string_set &s, char *name); | |
| 177 static char* register_string(string_set &s, char *name) { | |
| 178 string_set::iterator i = s.find(name); | |
| 179 if (i != s.end()) return *i; | |
| 180 char *x = strdup(name); | |
| 181 s.insert(x); | |
| 182 return x; | |
| 183 } | |
| 184 | |
| 16 | 185 //////////////////////////////////////////////// |
| 186 // syslog a message | |
| 187 // | |
| 188 static void my_syslog(char *text); | |
| 189 static void my_syslog(char *text) { | |
| 190 pthread_mutex_lock(&syslog_mutex); | |
| 191 openlog("dnsbl", LOG_PID, LOG_MAIL); | |
| 192 syslog(LOG_NOTICE, "%s", text); | |
| 193 closelog(); | |
| 194 pthread_mutex_unlock(&syslog_mutex); | |
| 195 } | |
| 196 | |
| 197 | |
| 12 | 198 // include the content scanner |
| 199 #include "scanner.cpp" | |
| 200 | |
| 201 | |
| 0 | 202 //////////////////////////////////////////////// |
| 203 // mail filter private data, held for us by sendmail | |
| 204 // | |
| 205 struct mlfiPriv | |
| 206 { | |
| 8 | 207 // connection specific data |
| 208 CONFIG *pc; // global context with our maps | |
| 209 int ip; // ip4 address of the smtp client | |
| 210 map<DNSBLP, status> checked; // status from those lists | |
| 211 // message specific data | |
| 0 | 212 char *mailaddr; // envelope from value |
| 213 bool authenticated; // client authenticated? if so, suppress all dnsbl checks | |
| 8 | 214 bool have_whites; // have at least one whitelisted recipient? need to accept content and remove all non-whitelisted recipients if it fails |
| 215 bool only_whites; // every recipient is whitelisted? | |
| 216 url_scanner *scanner; // object to handle body scanning | |
| 217 string_set non_whites; // remember the non-whitelisted recipients so we can remove them if need be | |
| 12 | 218 string_set hosts; // remember the hosts that we have checked |
| 0 | 219 mlfiPriv(); |
| 220 ~mlfiPriv(); | |
| 8 | 221 void reset(bool final = false); // for a new message |
| 0 | 222 }; |
| 223 mlfiPriv::mlfiPriv() { | |
| 224 pthread_mutex_lock(&config_mutex); | |
| 225 pc = config; | |
| 226 pc->reference_count++; | |
| 227 pthread_mutex_unlock(&config_mutex); | |
| 8 | 228 ip = 0; |
| 229 mailaddr = NULL; | |
| 230 authenticated = false; | |
| 231 have_whites = false; | |
| 232 only_whites = true; | |
| 12 | 233 scanner = new url_scanner(&hosts); |
| 0 | 234 } |
| 235 mlfiPriv::~mlfiPriv() { | |
| 236 pthread_mutex_lock(&config_mutex); | |
| 237 pc->reference_count--; | |
| 238 pthread_mutex_unlock(&config_mutex); | |
| 8 | 239 reset(true); |
| 240 } | |
| 241 void mlfiPriv::reset(bool final) { | |
| 0 | 242 if (mailaddr) free(mailaddr); |
| 8 | 243 delete scanner; |
| 244 discard(non_whites); | |
| 12 | 245 discard(hosts); |
| 8 | 246 if (!final) { |
| 247 mailaddr = NULL; | |
| 248 authenticated = false; | |
| 249 have_whites = false; | |
| 250 only_whites = true; | |
| 12 | 251 scanner = new url_scanner(&hosts); |
| 8 | 252 } |
| 0 | 253 } |
| 254 | |
| 255 #define MLFIPRIV ((struct mlfiPriv *) smfi_getpriv(ctx)) | |
| 256 | |
| 257 | |
| 258 //////////////////////////////////////////////// | |
| 259 // register a global string | |
| 260 // | |
| 261 static char* register_string(char *name); | |
| 262 static char* register_string(char *name) { | |
| 12 | 263 return register_string(all_strings, name); |
| 0 | 264 } |
| 265 | |
| 266 | |
| 267 static char* next_token(char *delim); | |
| 268 static char* next_token(char *delim) { | |
| 269 char *name = strtok(NULL, delim); | |
| 270 if (!name) return name; | |
| 271 return register_string(name); | |
| 272 } | |
| 273 | |
| 274 | |
| 275 //////////////////////////////////////////////// | |
| 276 // lookup an email address in the env_from or env_to maps | |
| 277 // | |
| 278 static char* lookup1(char *email, string_map map); | |
| 279 static char* lookup1(char *email, string_map map) { | |
| 280 string_map::iterator i = map.find(email); | |
| 281 if (i != map.end()) return (*i).second; | |
| 282 char *x = strchr(email, '@'); | |
| 283 if (!x) return DEFAULT; | |
| 284 x++; | |
| 285 i = map.find(x); | |
| 286 if (i != map.end()) return (*i).second; | |
| 287 return DEFAULT; | |
| 288 } | |
| 289 | |
| 290 | |
| 291 //////////////////////////////////////////////// | |
| 292 // lookup an email address in the env_from or env_to maps | |
| 293 // this email address is passed in from sendmail, and will | |
| 294 // always be enclosed in <>. It may have mixed case, just | |
| 295 // as the mail client sent it. | |
| 296 // | |
| 297 static char* lookup(char* email, string_map map); | |
| 298 static char* lookup(char* email, string_map map) { | |
| 299 int n = strlen(email)-2; | |
| 300 if (n < 1) return DEFAULT; // malformed | |
| 301 char *key = strdup(email+1); | |
| 302 key[n] = '\0'; | |
| 303 for (int i=0; i<n; i++) key[i] = tolower(key[i]); | |
| 304 char *rc = lookup1(key, map); | |
| 305 free(key); | |
| 306 return rc; | |
| 307 } | |
| 308 | |
| 309 | |
| 310 //////////////////////////////////////////////// | |
| 311 // find the dnsbl with a specific name | |
| 312 // | |
| 313 static DNSBLP find_dnsbl(CONFIG &dc, char *name); | |
| 314 static DNSBLP find_dnsbl(CONFIG &dc, char *name) { | |
| 315 dnsblp_map::iterator i = dc.dnsbls.find(name); | |
| 316 if (i == dc.dnsbls.end()) return NULL; | |
| 317 return (*i).second; | |
| 318 } | |
| 319 | |
| 320 | |
| 321 //////////////////////////////////////////////// | |
| 322 // find the dnsbll with a specific name | |
| 323 // | |
| 324 static DNSBLLP find_dnsbll(CONFIG &dc, char *name); | |
| 325 static DNSBLLP find_dnsbll(CONFIG &dc, char *name) { | |
| 326 dnsbllp_map::iterator i = dc.dnsblls.find(name); | |
| 327 if (i == dc.dnsblls.end()) return NULL; | |
| 328 return (*i).second; | |
| 329 } | |
| 330 | |
| 331 | |
| 332 //////////////////////////////////////////////// | |
| 333 // find the envfrom map with a specific name | |
| 334 // | |
| 335 static string_map* find_from_map(CONFIG &dc, char *name); | |
| 336 static string_map* find_from_map(CONFIG &dc, char *name) { | |
| 337 from_map::iterator i = dc.env_from.find(name); | |
| 338 if (i == dc.env_from.end()) return NULL; | |
| 339 return (*i).second; | |
| 340 } | |
| 341 | |
| 342 | |
| 343 static string_map& really_find_from_map(CONFIG &dc, char *name); | |
| 344 static string_map& really_find_from_map(CONFIG &dc, char *name) { | |
| 345 string_map *sm = find_from_map(dc, name); | |
| 346 if (!sm) { | |
| 347 sm = new string_map; | |
| 348 dc.env_from[name] = sm; | |
| 349 } | |
| 350 return *sm; | |
| 351 } | |
| 352 | |
| 353 | |
| 354 //////////////////////////////////////////////// | |
| 8 | 355 // |
| 356 // ask a dns question and get an A record answer - we don't try | |
| 357 // very hard, just using the default resolver retry settings. | |
| 358 // If we cannot get an answer, we just accept the mail. The | |
| 359 // caller must ensure thread safety. | |
| 360 // | |
| 0 | 361 // |
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362 static int dns_interface(char *question, bool maybe_ip); |
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363 static int dns_interface(char *question, bool maybe_ip) { |
| 16 | 364 #ifdef NS_PACKETSZ |
| 8 | 365 u_char answer[NS_PACKETSZ]; |
| 366 int length = res_search(question, ns_c_in, ns_t_a, answer, sizeof(answer)); | |
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367 if (length >= 0) { // no error yet |
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368 // parse the answer |
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369 ns_msg handle; |
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370 ns_rr rr; |
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371 if (ns_initparse(answer, length, &handle) == 0) { |
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372 int rrnum = 0; |
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373 while (ns_parserr(&handle, ns_s_an, rrnum++, &rr) == 0) { |
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374 if (ns_rr_type(rr) == ns_t_a) { |
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375 int address; |
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376 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); |
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377 return address; |
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378 } |
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379 } |
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380 } |
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381 } |
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382 if (maybe_ip) { |
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383 // might be a bare ip address |
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384 in_addr ip; |
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385 if (inet_aton(question, &ip)) { |
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386 return ip.s_addr; |
| 8 | 387 } |
| 388 } | |
| 389 return 0; | |
| 16 | 390 #else |
| 391 struct hostent *host = gethostbyname(question); | |
| 392 if (!host) return 0; | |
| 393 if (host->h_addrtype != AF_INET) return 0; | |
| 394 int address; | |
| 395 memcpy(&address, host->h_addr, sizeof(address)); | |
| 396 return address; | |
| 397 #endif | |
| 8 | 398 } |
| 399 | |
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400 static int protected_dns_interface(char *question, bool maybe_ip); |
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401 static int protected_dns_interface(char *question, bool maybe_ip) { |
| 8 | 402 int ans; |
| 403 pthread_mutex_lock(&resolve_mutex); | |
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404 ans = dns_interface(question, maybe_ip); |
| 8 | 405 pthread_mutex_unlock(&resolve_mutex); |
| 406 return ans; | |
| 407 | |
| 408 } | |
| 409 | |
| 410 //////////////////////////////////////////////// | |
| 411 // check a single dnsbl | |
| 412 // | |
| 413 static status check_single(int ip, char *suffix); | |
| 414 static status check_single(int ip, char *suffix) { | |
| 0 | 415 // make a dns question |
| 416 const u_char *src = (const u_char *)&ip; | |
| 417 if (src[0] == 127) return oksofar; // don't do dns lookups on localhost | |
| 16 | 418 #ifdef NS_MAXDNAME |
| 0 | 419 char question[NS_MAXDNAME]; |
| 16 | 420 #else |
| 421 char question[1000]; | |
| 422 #endif | |
| 8 | 423 snprintf(question, sizeof(question), "%u.%u.%u.%u.%s.", src[3], src[2], src[1], src[0], suffix); |
| 424 // ask the question, if we get an A record it implies a blacklisted ip address | |
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425 return (protected_dns_interface(question, false)) ? reject : oksofar; |
| 8 | 426 } |
| 427 | |
| 428 | |
| 429 //////////////////////////////////////////////// | |
| 430 // check a single dnsbl | |
| 431 // | |
| 432 static status check_single(int ip, DNSBL &bl); | |
| 433 static status check_single(int ip, DNSBL &bl) { | |
| 434 return check_single(ip, bl.suffix); | |
| 0 | 435 } |
| 436 | |
| 437 | |
| 438 //////////////////////////////////////////////// | |
| 439 // check the dnsbls specified for this recipient | |
| 440 // | |
| 441 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist); | |
| 442 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist) { | |
| 443 if (priv.authenticated) return oksofar; | |
| 444 if (!dnsbllp) return oksofar; | |
| 445 DNSBLL &dnsbll = *dnsbllp; | |
| 446 for (DNSBLL::iterator i=dnsbll.begin(); i!=dnsbll.end(); i++) { | |
| 447 DNSBLP dp = *i; // non null by construction | |
| 448 status st; | |
| 449 map<DNSBLP, status>::iterator f = priv.checked.find(dp); | |
| 450 if (f == priv.checked.end()) { | |
| 451 // have not checked this list yet | |
| 8 | 452 st = check_single(priv.ip, *dp); |
| 0 | 453 rejectlist = dp; |
| 454 priv.checked[dp] = st; | |
| 455 } | |
| 456 else { | |
| 457 st = (*f).second; | |
| 458 rejectlist = (*f).first; | |
| 459 } | |
| 460 if (st == reject) return st; | |
| 461 } | |
| 462 return oksofar; | |
| 463 } | |
| 464 | |
| 465 | |
| 466 //////////////////////////////////////////////// | |
| 8 | 467 // check the dnsbls specified for this recipient |
| 468 // | |
| 16 | 469 static status check_hosts(mlfiPriv &priv, char *&host, int &ip); |
| 470 static status check_hosts(mlfiPriv &priv, char *&host, int &ip) { | |
| 8 | 471 CONFIG &dc = *priv.pc; |
| 472 if (!dc.content_suffix) return oksofar; | |
| 473 int count = 0; | |
| 12 | 474 for (string_set::iterator i=priv.hosts.begin(); i!=priv.hosts.end(); i++) { |
| 8 | 475 count++; |
| 12 | 476 if (count > 20) return oksofar; // silly to check too many hosts |
| 16 | 477 host = *i; |
| 478 if (debug_syslog) { | |
| 479 char buf[200]; | |
| 480 snprintf(buf, sizeof(buf), "looking for host %s", host); | |
| 481 my_syslog(buf); | |
| 482 } | |
|
23
06de5ab6a232
add url decoding stage, allow http:/ single / in yahoo redirector, allow ip address hostnames
carl
parents:
22
diff
changeset
|
483 ip = protected_dns_interface(host, true); |
| 8 | 484 if (ip) { |
| 16 | 485 if (debug_syslog) { |
| 486 char adr[sizeof "255.255.255.255"]; | |
| 487 adr[0] = '\0'; | |
| 488 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 489 char buf[200]; | |
| 490 snprintf(buf, sizeof(buf), "found host %s at %s", host, adr); | |
| 491 my_syslog(buf); | |
| 492 } | |
| 8 | 493 status st = check_single(ip, dc.content_suffix); |
| 494 if (st == reject) return st; | |
| 495 } | |
| 496 } | |
| 9 | 497 return oksofar; |
| 8 | 498 } |
| 499 | |
| 500 | |
| 501 //////////////////////////////////////////////// | |
| 0 | 502 // start of sendmail milter interfaces |
| 503 // | |
| 504 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr) | |
| 505 { | |
| 506 // allocate some private memory | |
| 507 mlfiPriv *priv = new mlfiPriv; | |
| 508 if (hostaddr->sa_family == AF_INET) { | |
| 509 priv->ip = ((struct sockaddr_in *)hostaddr)->sin_addr.s_addr; | |
| 510 } | |
| 511 | |
| 512 // save the private data | |
| 513 smfi_setpriv(ctx, (void*)priv); | |
| 514 | |
| 515 // continue processing | |
| 516 return SMFIS_CONTINUE; | |
| 517 } | |
| 518 | |
| 519 sfsistat mlfi_envfrom(SMFICTX *ctx, char **from) | |
| 520 { | |
| 521 mlfiPriv &priv = *MLFIPRIV; | |
| 522 priv.mailaddr = strdup(from[0]); | |
| 523 priv.authenticated = (smfi_getsymval(ctx, "{auth_authen}") != NULL); | |
| 524 return SMFIS_CONTINUE; | |
| 525 } | |
| 526 | |
| 527 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **rcpt) | |
| 528 { | |
| 529 DNSBLP rejectlist = NULL; // list that caused the reject | |
| 530 status st = oksofar; | |
| 531 mlfiPriv &priv = *MLFIPRIV; | |
| 532 CONFIG &dc = *priv.pc; | |
| 533 char *rcptaddr = rcpt[0]; | |
| 534 char *dnsname = lookup(rcptaddr, dc.env_to_dnsbll); | |
| 535 char *fromname = lookup(rcptaddr, dc.env_to_chkfrom); | |
| 536 if ((strcmp(dnsname, BLACK) == 0) || | |
| 537 (strcmp(fromname, BLACK) == 0)) { | |
| 538 st = black; // two options to blacklist this recipient | |
| 539 } | |
| 540 else if (strcmp(fromname, WHITE) == 0) { | |
| 541 st = white; | |
| 542 } | |
| 543 else { | |
| 544 // check an env_from map | |
| 545 string_map *sm = find_from_map(dc, fromname); | |
| 546 if (sm != NULL) { | |
| 547 fromname = lookup(priv.mailaddr, *sm); // returns default if name not in map | |
| 548 if (strcmp(fromname, BLACK) == 0) { | |
| 549 st = black; // blacklist this envelope from value | |
| 550 } | |
| 551 if (strcmp(fromname, WHITE) == 0) { | |
| 552 st = white; // blacklist this envelope from value | |
| 553 } | |
| 554 } | |
| 555 } | |
| 556 if ((st == oksofar) && (strcmp(dnsname, WHITE) != 0)) { | |
| 557 // check dns lists | |
| 558 st = check_dnsbl(priv, find_dnsbll(dc, dnsname), rejectlist); | |
| 559 } | |
| 560 | |
| 561 if (st == reject) { | |
| 562 // reject the recipient based on some dnsbl | |
| 563 char adr[sizeof "255.255.255.255"]; | |
| 564 adr[0] = '\0'; | |
| 8 | 565 inet_ntop(AF_INET, (const u_char *)&priv.ip, adr, sizeof(adr)); |
| 0 | 566 char buf[2000]; |
| 567 snprintf(buf, sizeof(buf), rejectlist->message, adr, adr); | |
| 568 smfi_setreply(ctx, "550", "5.7.1", buf); | |
| 569 return SMFIS_REJECT; | |
| 570 } | |
| 571 else if (st == black) { | |
| 572 // reject the recipient based on blacklisting either from or to | |
| 573 smfi_setreply(ctx, "550", "5.7.1", "no such user"); | |
| 574 return SMFIS_REJECT; | |
| 575 } | |
| 576 else { | |
| 577 // accept the recipient | |
| 8 | 578 if (st == oksofar) { |
| 579 // but remember the non-whites | |
| 12 | 580 register_string(priv.non_whites, rcptaddr); |
| 8 | 581 priv.only_whites = false; |
| 582 } | |
| 583 if (st == white) { | |
| 584 priv.have_whites = true; | |
| 585 } | |
| 0 | 586 return SMFIS_CONTINUE; |
| 587 } | |
| 588 } | |
| 589 | |
| 8 | 590 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len) |
| 0 | 591 { |
| 592 mlfiPriv &priv = *MLFIPRIV; | |
| 8 | 593 if (priv.authenticated) return SMFIS_CONTINUE; |
| 594 if (priv.only_whites) return SMFIS_CONTINUE; | |
| 595 priv.scanner->scan(data, len); | |
| 11 | 596 return SMFIS_CONTINUE; |
| 8 | 597 } |
| 598 | |
| 599 sfsistat mlfi_eom(SMFICTX *ctx) | |
| 600 { | |
| 601 sfsistat rc; | |
| 602 mlfiPriv &priv = *MLFIPRIV; | |
| 16 | 603 char *host = NULL; |
| 8 | 604 int ip; |
| 605 // process end of message | |
| 606 if (priv.authenticated || | |
| 607 priv.only_whites || | |
| 16 | 608 (check_hosts(priv, host, ip) == oksofar)) rc = SMFIS_CONTINUE; |
| 8 | 609 else { |
| 610 if (!priv.have_whites) { | |
| 611 // can reject the entire message | |
| 612 char adr[sizeof "255.255.255.255"]; | |
| 613 adr[0] = '\0'; | |
| 614 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 615 char buf[2000]; | |
| 16 | 616 snprintf(buf, sizeof(buf), priv.pc->content_message, host, adr); |
| 8 | 617 smfi_setreply(ctx, "550", "5.7.1", buf); |
| 618 rc = SMFIS_REJECT; | |
| 619 } | |
| 620 else { | |
| 621 // need to accept it but remove the recipients that don't want it | |
| 622 for (string_set::iterator i=priv.non_whites.begin(); i!=priv.non_whites.end(); i++) { | |
| 623 char *rcpt = *i; | |
| 624 smfi_delrcpt(ctx, rcpt); | |
| 625 } | |
| 626 rc = SMFIS_CONTINUE; | |
| 627 } | |
| 0 | 628 } |
| 8 | 629 // reset for a new message on the same connection |
| 630 mlfi_abort(ctx); | |
| 631 return rc; | |
| 632 } | |
| 633 | |
| 634 sfsistat mlfi_abort(SMFICTX *ctx) | |
| 635 { | |
| 636 mlfiPriv &priv = *MLFIPRIV; | |
| 637 priv.reset(); | |
| 0 | 638 return SMFIS_CONTINUE; |
| 639 } | |
| 640 | |
| 641 sfsistat mlfi_close(SMFICTX *ctx) | |
| 642 { | |
| 643 mlfiPriv *priv = MLFIPRIV; | |
| 644 if (!priv) return SMFIS_CONTINUE; | |
| 645 delete priv; | |
| 646 smfi_setpriv(ctx, NULL); | |
| 647 return SMFIS_CONTINUE; | |
| 648 } | |
| 649 | |
| 650 struct smfiDesc smfilter = | |
| 651 { | |
| 652 "DNSBL", // filter name | |
| 653 SMFI_VERSION, // version code -- do not change | |
| 654 SMFIF_DELRCPT, // flags | |
| 655 mlfi_connect, // connection info filter | |
| 656 NULL, // SMTP HELO command filter | |
| 657 mlfi_envfrom, // envelope sender filter | |
| 658 mlfi_envrcpt, // envelope recipient filter | |
| 659 NULL, // header filter | |
| 660 NULL, // end of header | |
| 8 | 661 mlfi_body, // body block filter |
| 662 mlfi_eom, // end of message | |
| 663 mlfi_abort, // message aborted | |
| 0 | 664 mlfi_close, // connection cleanup |
| 665 }; | |
| 666 | |
| 667 | |
| 668 static void dumpit(char *name, string_map map); | |
| 669 static void dumpit(char *name, string_map map) { | |
| 9 | 670 fprintf(stdout, "\n"); |
| 0 | 671 for (string_map::iterator i=map.begin(); i!=map.end(); i++) { |
| 9 | 672 fprintf(stdout, "%s %s->%s\n", name, (*i).first, (*i).second); |
| 0 | 673 } |
| 674 } | |
| 675 | |
| 676 | |
| 677 static void dumpit(from_map map); | |
| 678 static void dumpit(from_map map) { | |
| 679 for (from_map::iterator i=map.begin(); i!=map.end(); i++) { | |
| 3 | 680 char buf[2000]; |
| 681 snprintf(buf, sizeof(buf), "envelope from map for %s", (*i).first); | |
| 0 | 682 string_map *sm = (*i).second; |
| 3 | 683 dumpit(buf, *sm); |
| 0 | 684 } |
| 685 } | |
| 686 | |
| 687 | |
| 3 | 688 static void dumpit(CONFIG &dc); |
| 689 static void dumpit(CONFIG &dc) { | |
| 5 | 690 dumpit(dc.env_from); |
| 691 dumpit("envelope to (dnsbl list)", dc.env_to_dnsbll); | |
| 692 dumpit("envelope to (from map)", dc.env_to_chkfrom); | |
| 9 | 693 fprintf(stdout, "\ndnsbls\n"); |
| 0 | 694 for (dnsblp_map::iterator i=dc.dnsbls.begin(); i!=dc.dnsbls.end(); i++) { |
| 9 | 695 fprintf(stdout, "%s %s %s\n", (*i).first, (*i).second->suffix, (*i).second->message); |
| 0 | 696 } |
| 9 | 697 fprintf(stdout, "\ndnsbl_lists\n"); |
| 0 | 698 for (dnsbllp_map::iterator i=dc.dnsblls.begin(); i!=dc.dnsblls.end(); i++) { |
| 699 char *name = (*i).first; | |
| 700 DNSBLL &dl = *((*i).second); | |
| 9 | 701 fprintf(stdout, "%s", name); |
| 0 | 702 for (DNSBLL::iterator j=dl.begin(); j!=dl.end(); j++) { |
| 703 DNSBL &d = **j; | |
| 9 | 704 fprintf(stdout, " %s", d.suffix); |
| 0 | 705 } |
| 9 | 706 fprintf(stdout, "\n"); |
| 0 | 707 } |
| 9 | 708 if (dc.content_suffix) { |
| 709 fprintf(stdout, "\ncontent filtering enabled with %s %s\n", dc.content_suffix, dc.content_message); | |
| 710 } | |
| 711 fprintf(stdout, "\nfiles\n"); | |
| 3 | 712 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { |
| 713 char *f = *i; | |
| 9 | 714 fprintf(stdout, "config includes %s\n", f); |
| 3 | 715 } |
| 716 } | |
| 717 | |
| 718 | |
| 719 //////////////////////////////////////////////// | |
| 720 // check for redundant or recursive include files | |
| 721 // | |
| 722 static bool ok_to_include(CONFIG &dc, char *fn); | |
| 723 static bool ok_to_include(CONFIG &dc, char *fn) { | |
| 724 if (!fn) return false; | |
| 725 bool ok = true; | |
| 726 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 727 char *f = *i; | |
| 728 if (strcmp(f, fn) == 0) { | |
| 729 my_syslog("redundant or recursive include file detected"); | |
| 730 ok = false; | |
| 731 break; | |
| 732 } | |
| 733 } | |
| 734 return ok; | |
| 0 | 735 } |
| 736 | |
| 737 | |
| 738 //////////////////////////////////////////////// | |
| 739 // load a single config file | |
| 740 // | |
| 3 | 741 static void load_conf_dcc(CONFIG &dc, char *name, char *fn); |
| 742 static void load_conf_dcc(CONFIG &dc, char *name, char *fn) { | |
| 743 dc.config_files.push_back(fn); | |
| 744 char *list = BLACK; | |
| 745 const int LINE_SIZE = 2000; | |
| 746 ifstream is(fn); | |
| 747 if (is.fail()) return; | |
| 748 char line[LINE_SIZE]; | |
| 749 char *delim = " \t"; | |
| 750 int curline = 0; | |
| 751 while (!is.eof()) { | |
| 752 is.getline(line, LINE_SIZE); | |
| 753 curline++; | |
| 754 int n = strlen(line); | |
| 755 if (!n) continue; | |
| 756 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 757 if (line[0] == '#') continue; | |
| 758 char *head = line; | |
| 759 if (strspn(line, delim) == 0) { | |
| 760 // have a leading ok/many tag to fetch | |
| 761 char *cmd = strtok(line, delim); | |
| 762 if (strcmp(cmd, MANY) == 0) list = BLACK; | |
| 763 else if (strcmp(cmd, OK) == 0) list = WHITE; | |
| 764 head = cmd + strlen(cmd) + 1; | |
| 765 } | |
| 766 char *cmd = strtok(head, delim); | |
| 767 if (!cmd) continue; | |
| 768 if (strcmp(cmd, "env_from") == 0) { | |
| 769 char *from = next_token(delim); | |
| 770 if (from) { | |
| 771 string_map &fm = really_find_from_map(dc, name); | |
| 772 fm[from] = list; | |
| 773 } | |
| 774 } | |
| 775 else if (strcmp(cmd, "env_to") == 0) { | |
| 776 char *to = next_token(delim); | |
| 777 if (to) { | |
| 778 dc.env_to_dnsbll[to] = list; | |
| 779 dc.env_to_chkfrom[to] = list; | |
| 780 } | |
| 781 } | |
| 782 else if (strcmp(cmd, "substitute") == 0) { | |
| 783 char *tag = next_token(delim); | |
| 784 if (tag && (strcmp(tag, "mail_host") == 0)) { | |
| 785 char *from = next_token(delim); | |
| 786 if (from) { | |
| 787 string_map &fm = really_find_from_map(dc, name); | |
| 788 fm[from] = list; | |
| 789 } | |
| 790 } | |
| 791 } | |
| 792 else if (strcmp(cmd, "include") == 0) { | |
| 793 char *fn = next_token(delim); | |
| 794 if (ok_to_include(dc, fn)) { | |
| 795 load_conf_dcc(dc, name, fn); | |
| 796 } | |
| 797 } | |
| 798 | |
| 799 } | |
| 800 is.close(); | |
| 801 } | |
| 802 | |
| 803 | |
| 0 | 804 static void load_conf(CONFIG &dc, char *fn); |
| 805 static void load_conf(CONFIG &dc, char *fn) { | |
| 806 dc.config_files.push_back(fn); | |
| 807 map<char*, int, ltstr> commands; | |
| 8 | 808 enum {dummy, content, dnsbl, dnsbll, envfrom, envto, include, includedcc}; |
| 809 commands["content" ] = content; | |
| 3 | 810 commands["dnsbl" ] = dnsbl; |
| 811 commands["dnsbl_list" ] = dnsbll; | |
| 812 commands["env_from" ] = envfrom; | |
| 813 commands["env_to" ] = envto; | |
| 814 commands["include" ] = include; | |
| 815 commands["include_dcc"] = includedcc; | |
| 0 | 816 const int LINE_SIZE = 2000; |
| 817 ifstream is(fn); | |
| 818 if (is.fail()) return; | |
| 819 char line[LINE_SIZE]; | |
| 820 char orig[LINE_SIZE]; | |
| 821 char *delim = " \t"; | |
| 822 int curline = 0; | |
| 823 while (!is.eof()) { | |
| 824 is.getline(line, LINE_SIZE); | |
| 825 snprintf(orig, sizeof(orig), "%s", line); | |
| 826 curline++; | |
| 827 int n = strlen(line); | |
| 828 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 829 char *cmd = strtok(line, delim); | |
| 830 if (cmd && (cmd[0] != '#') && (cmd[0] != '\0')) { | |
| 831 // have a decent command | |
| 832 bool processed = false; | |
| 833 switch (commands[cmd]) { | |
| 8 | 834 case content: { |
| 835 char *suff = strtok(NULL, delim); | |
| 836 if (!suff) break; // no dns suffic | |
| 837 char *msg = suff + strlen(suff); | |
| 838 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 839 msg = strchr(msg+1, '\''); | |
| 840 if (!msg) break; // no reply message template | |
| 841 msg++; // move over the leading ' | |
| 842 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 843 char *last = strchr(msg, '\''); | |
| 844 if (!last) break; // no trailing quote | |
| 845 *last = '\0'; // make it a null terminator | |
| 846 dc.content_suffix = register_string(suff); | |
| 847 dc.content_message = register_string(msg); | |
| 848 processed = true; | |
| 849 } break; | |
| 850 | |
| 0 | 851 case dnsbl: { |
| 852 // have a new dnsbl to use | |
| 853 char *name = next_token(delim); | |
| 854 if (!name) break; // no name name | |
| 855 if (find_dnsbl(dc, name)) break; // duplicate entry | |
| 856 char *suff = strtok(NULL, delim); | |
| 857 if (!suff) break; // no dns suffic | |
| 858 char *msg = suff + strlen(suff); | |
| 859 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 860 msg = strchr(msg+1, '\''); | |
| 861 if (!msg) break; // no reply message template | |
| 862 msg++; // move over the leading ' | |
| 863 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 864 char *last = strchr(msg, '\''); | |
| 865 if (!last) break; // no trailing quote | |
| 866 *last = '\0'; // make it a null terminator | |
| 867 dc.dnsbls[name] = new DNSBL(register_string(suff), register_string(msg)); | |
| 868 processed = true; | |
| 869 } break; | |
| 870 | |
| 871 case dnsbll: { | |
| 872 // define a new combination of dnsbls | |
| 873 char *name = next_token(delim); | |
| 874 if (!name) break; | |
| 875 if (find_dnsbll(dc, name)) break; // duplicate entry | |
| 876 char *list = next_token(delim); | |
| 877 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 878 DNSBLLP d = new DNSBLL; | |
| 879 DNSBLP p = find_dnsbl(dc, list); | |
| 880 if (p) d->push_back(p); | |
| 881 while (true) { | |
| 882 list = next_token(delim); | |
| 883 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 884 DNSBLP p = find_dnsbl(dc, list); | |
| 885 if (p) d->push_back(p); | |
| 886 } | |
| 887 dc.dnsblls[name] = d; | |
| 888 processed = true; | |
| 889 } break; | |
| 890 | |
| 891 case envfrom: { | |
| 892 // add an entry into the named string_map | |
| 893 char *name = next_token(delim); | |
| 894 if (!name) break; | |
| 895 char *from = next_token(delim); | |
| 896 if (!from) break; | |
| 897 char *list = next_token(delim); | |
| 898 if (!list) break; | |
| 899 if ((strcmp(list, WHITE) == 0) || | |
| 900 (strcmp(list, BLACK) == 0)) { | |
| 901 string_map &fm = really_find_from_map(dc, name); | |
| 902 fm[from] = list; | |
| 903 processed = true; | |
| 904 } | |
| 905 else { | |
| 906 // list may be the name of a previously defined from_map | |
| 907 string_map *m = find_from_map(dc, list); | |
| 908 if (m && (strcmp(list,name) != 0)) { | |
| 909 string_map &pm = *m; | |
| 910 string_map &fm = really_find_from_map(dc, name); | |
| 911 fm.insert(pm.begin(), pm.end()); | |
| 912 processed = true; | |
| 913 } | |
| 914 } | |
| 915 } break; | |
| 916 | |
| 917 case envto: { | |
| 918 // define the dnsbl_list and env_from maps to use for this recipient | |
| 919 char *to = next_token(delim); | |
| 920 if (!to) break; | |
| 921 char *list = next_token(delim); | |
| 922 if (!list) break; | |
| 923 char *from = next_token(delim); | |
| 924 if (!from) break; | |
| 925 dc.env_to_dnsbll[to] = list; | |
| 926 dc.env_to_chkfrom[to] = from; | |
| 927 processed = true; | |
| 928 } break; | |
| 929 | |
| 930 case include: { | |
| 931 char *fn = next_token(delim); | |
| 3 | 932 if (ok_to_include(dc, fn)) { |
| 933 load_conf(dc, fn); | |
| 934 processed = true; | |
| 935 } | |
| 936 } break; | |
| 937 | |
| 938 case includedcc: { | |
| 939 char *name = next_token(delim); | |
| 940 if (!name) break; | |
| 941 char *fn = next_token(delim); | |
| 942 if (ok_to_include(dc, fn)) { | |
| 943 load_conf_dcc(dc, name, fn); | |
| 944 processed = true; | |
| 0 | 945 } |
| 946 } break; | |
| 947 | |
| 948 default: { | |
| 949 } break; | |
| 950 } | |
| 951 if (!processed) { | |
| 952 pthread_mutex_lock(&syslog_mutex); | |
| 953 openlog("dnsbl", LOG_PID, LOG_MAIL); | |
| 954 syslog(LOG_ERR, "ignoring file %s line %d : %s\n", fn, curline, orig); | |
| 955 closelog(); | |
| 956 pthread_mutex_unlock(&syslog_mutex); | |
| 957 } | |
| 958 } | |
| 959 } | |
| 960 is.close(); | |
| 961 } | |
| 962 | |
| 963 | |
| 964 //////////////////////////////////////////////// | |
| 965 // reload the config | |
| 966 // | |
| 967 static CONFIG* new_conf(); | |
| 968 static CONFIG* new_conf() { | |
| 969 my_syslog("loading new configuration"); | |
| 970 CONFIG *newc = new CONFIG; | |
| 971 load_conf(*newc, "dnsbl.conf"); | |
| 972 newc->load_time = time(NULL); | |
| 973 return newc; | |
| 974 } | |
| 975 | |
| 976 | |
| 977 //////////////////////////////////////////////// | |
| 978 // thread to watch the old config files for changes | |
| 979 // and reload when needed. we also cleanup old | |
| 980 // configs whose reference count has gone to zero. | |
| 981 // | |
| 982 static void* config_loader(void *arg); | |
| 983 static void* config_loader(void *arg) { | |
| 984 typedef set<CONFIG *> configp_set; | |
| 985 configp_set old_configs; | |
| 18 | 986 while (loader_run) { |
| 0 | 987 sleep(180); // look for modifications every 3 minutes |
| 18 | 988 if (!loader_run) break; |
| 0 | 989 CONFIG &dc = *config; |
| 990 time_t then = dc.load_time; | |
| 991 struct stat st; | |
| 992 bool reload = false; | |
| 993 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 994 char *fn = *i; | |
| 995 if (stat(fn, &st)) reload = true; // file disappeared | |
| 996 else if (st.st_mtime > then) reload = true; // file modified | |
| 997 if (reload) break; | |
| 998 } | |
| 999 if (reload) { | |
| 1000 CONFIG *newc = new_conf(); | |
| 1001 // replace the global config pointer | |
| 1002 pthread_mutex_lock(&config_mutex); | |
| 1003 CONFIG *old = config; | |
| 1004 config = newc; | |
| 1005 pthread_mutex_unlock(&config_mutex); | |
| 1006 if (old) old_configs.insert(old); | |
| 1007 } | |
| 1008 // now look for old configs with zero ref counts | |
| 1009 for (configp_set::iterator i=old_configs.begin(); i!=old_configs.end(); ) { | |
| 1010 CONFIG *old = *i; | |
| 1011 if (!old->reference_count) { | |
| 1012 delete old; // destructor does all the work | |
| 1013 old_configs.erase(i++); | |
| 1014 } | |
| 1015 else i++; | |
| 1016 } | |
| 1017 } | |
| 18 | 1018 return NULL; |
| 0 | 1019 } |
| 1020 | |
| 1021 | |
| 1022 static void usage(char *prog); | |
| 1023 static void usage(char *prog) | |
| 1024 { | |
| 16 | 1025 fprintf(stderr, "Usage: %s [-d] [-c] -p socket-addr [-t timeout]\n", prog); |
| 0 | 1026 fprintf(stderr, "where socket-addr is for the connection to sendmail and should be one of\n"); |
| 1027 fprintf(stderr, " inet:port@local-ip-address\n"); | |
| 1028 fprintf(stderr, " local:local-domain-socket-file-name\n"); | |
| 9 | 1029 fprintf(stderr, "-c will load and dump the config to stdout\n"); |
| 16 | 1030 fprintf(stderr, "-d will add some syslog debug messages\n"); |
| 0 | 1031 } |
| 1032 | |
| 1033 | |
| 1034 int main(int argc, char**argv) | |
| 1035 { | |
| 3 | 1036 bool check = false; |
| 1037 bool setconn = false; | |
| 0 | 1038 int c; |
| 16 | 1039 const char *args = "p:t:hcd"; |
| 0 | 1040 extern char *optarg; |
| 1041 | |
| 1042 // Process command line options | |
| 1043 while ((c = getopt(argc, argv, args)) != -1) { | |
| 1044 switch (c) { | |
| 1045 case 'p': | |
| 1046 if (optarg == NULL || *optarg == '\0') { | |
| 1047 fprintf(stderr, "Illegal conn: %s\n", optarg); | |
| 1048 exit(EX_USAGE); | |
| 1049 } | |
| 1050 if (smfi_setconn(optarg) == MI_FAILURE) { | |
| 1051 fprintf(stderr, "smfi_setconn failed\n"); | |
| 1052 exit(EX_SOFTWARE); | |
| 1053 } | |
| 1054 | |
| 1055 if (strncasecmp(optarg, "unix:", 5) == 0) unlink(optarg + 5); | |
| 1056 else if (strncasecmp(optarg, "local:", 6) == 0) unlink(optarg + 6); | |
| 3 | 1057 setconn = true; |
| 0 | 1058 break; |
| 1059 | |
| 1060 case 't': | |
| 1061 if (optarg == NULL || *optarg == '\0') { | |
| 1062 fprintf(stderr, "Illegal timeout: %s\n", optarg); | |
| 1063 exit(EX_USAGE); | |
| 1064 } | |
| 1065 if (smfi_settimeout(atoi(optarg)) == MI_FAILURE) { | |
| 1066 fprintf(stderr, "smfi_settimeout failed\n"); | |
| 1067 exit(EX_SOFTWARE); | |
| 1068 } | |
| 1069 break; | |
| 1070 | |
| 3 | 1071 case 'c': |
| 1072 check = true; | |
| 1073 break; | |
| 1074 | |
| 16 | 1075 case 'd': |
| 1076 debug_syslog = true; | |
| 1077 break; | |
| 1078 | |
| 0 | 1079 case 'h': |
| 1080 default: | |
| 1081 usage(argv[0]); | |
| 1082 exit(EX_USAGE); | |
| 1083 } | |
| 1084 } | |
| 5 | 1085 |
| 1086 if (check) { | |
| 1087 CONFIG &dc = *new_conf(); | |
| 1088 dumpit(dc); | |
| 1089 return 0; | |
| 1090 } | |
| 1091 | |
| 0 | 1092 if (!setconn) { |
| 1093 fprintf(stderr, "%s: Missing required -p argument\n", argv[0]); | |
| 1094 usage(argv[0]); | |
| 1095 exit(EX_USAGE); | |
| 1096 } | |
| 5 | 1097 |
| 0 | 1098 if (smfi_register(smfilter) == MI_FAILURE) { |
| 1099 fprintf(stderr, "smfi_register failed\n"); | |
| 1100 exit(EX_UNAVAILABLE); | |
| 1101 } | |
| 1102 | |
| 1103 // switch to background mode | |
| 1104 if (daemon(1,0) < 0) { | |
| 1105 fprintf(stderr, "daemon() call failed\n"); | |
| 1106 exit(EX_UNAVAILABLE); | |
| 1107 } | |
| 1108 | |
| 1109 // initialize the thread sync objects | |
| 1110 pthread_mutex_init(&config_mutex, 0); | |
| 1111 pthread_mutex_init(&syslog_mutex, 0); | |
| 1112 pthread_mutex_init(&resolve_mutex, 0); | |
| 1113 | |
| 1114 // load the initial config | |
| 1115 config = new_conf(); | |
| 1116 | |
| 1117 // only create threads after the fork() in daemon | |
| 1118 pthread_t tid; | |
| 1119 if (pthread_create(&tid, 0, config_loader, 0)) | |
| 1120 my_syslog("failed to create config loader thread"); | |
| 1121 if (pthread_detach(tid)) | |
| 1122 my_syslog("failed to detach config loader thread"); | |
| 1123 | |
| 1124 // write the pid | |
| 1125 const char *pidpath = "/var/run/dnsbl.pid"; | |
| 1126 unlink(pidpath); | |
| 1127 FILE *f = fopen(pidpath, "w"); | |
| 1128 if (f) { | |
| 22 | 1129 #ifdef linux |
| 1130 // from a comment in the DCC source code: | |
| 1131 // Linux threads are broken. Signals given the | |
| 1132 // original process are delivered to only the | |
| 1133 // thread that happens to have that PID. The | |
| 1134 // sendmail libmilter thread that needs to hear | |
| 1135 // SIGINT and other signals does not, and that breaks | |
| 1136 // scripts that need to stop milters. | |
| 1137 // However, signaling the process group works. | |
| 0 | 1138 fprintf(f, "-%d\n", (u_int)getpgrp()); |
| 22 | 1139 #else |
| 1140 fprintf(f, "%d\n", (u_int)getpid()); | |
| 1141 #endif | |
| 0 | 1142 fclose(f); |
| 1143 } | |
| 1144 | |
| 18 | 1145 time_t starting = time(NULL); |
| 1146 int rc = smfi_main(); | |
| 22 | 1147 if ((rc != MI_SUCCESS) && (time(NULL) > starting+5*60)) { |
| 18 | 1148 my_syslog("trying to restart after smfi_main()"); |
| 1149 loader_run = false; // eventually the config loader thread will terminate | |
| 1150 execvp(argv[0], argv); | |
| 1151 } | |
| 1152 exit((rc == MI_SUCCESS) ? 0 : EX_UNAVAILABLE); | |
| 0 | 1153 } |
| 8 | 1154 |