Mercurial > dnsbl
annotate src/dnsbl.cpp @ 25:6176e7b2e8af
better scanning for bad html tags, allow binary zip and gz files with random char sequences
| author | carl |
|---|---|
| date | Fri, 21 May 2004 21:45:36 -0700 |
| parents | 2e23b7184d2b |
| children | fdae7ab30cfc |
| 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; // "" |
| 24 | 128 char * limit_message; // error message for excessive bad html tags |
| 129 int bad_tag_limit; // limit on bad html tags | |
| 130 string_set html_tags; // set of valid html tags | |
| 0 | 131 CONFIG(); |
| 132 ~CONFIG(); | |
| 133 }; | |
| 134 CONFIG::CONFIG() { | |
| 135 reference_count = 0; | |
| 136 load_time = 0; | |
| 8 | 137 content_suffix = NULL; |
| 138 content_message = NULL; | |
| 24 | 139 limit_message = NULL; |
| 140 bad_tag_limit = 0; | |
| 0 | 141 } |
| 142 CONFIG::~CONFIG() { | |
| 143 for (dnsblp_map::iterator i=dnsbls.begin(); i!=dnsbls.end(); i++) { | |
| 144 DNSBLP d = (*i).second; | |
| 24 | 145 // delete the underlying DNSBL objects. |
| 0 | 146 delete d; |
| 147 } | |
| 148 for (dnsbllp_map::iterator i=dnsblls.begin(); i!=dnsblls.end(); i++) { | |
| 149 DNSBLLP d = (*i).second; | |
| 24 | 150 // *d is a list of pointers to DNSBL objects, but |
| 151 // the underlying objects have already been deleted above. | |
| 0 | 152 delete d; |
| 153 } | |
| 154 for (from_map::iterator i=env_from.begin(); i!=env_from.end(); i++) { | |
| 155 string_map *d = (*i).second; | |
| 156 delete d; | |
| 157 } | |
| 158 } | |
| 159 | |
| 16 | 160 static bool debug_syslog = false; |
| 18 | 161 static bool loader_run = true; // used to stop the config loader thread |
| 0 | 162 static string_set all_strings; // owns all the strings, only modified by the config loader thread |
| 163 static CONFIG * config = NULL; // protected by the config_mutex | |
| 164 | |
| 165 static pthread_mutex_t config_mutex; | |
| 166 static pthread_mutex_t syslog_mutex; | |
| 167 static pthread_mutex_t resolve_mutex; | |
| 168 | |
| 169 | |
| 170 //////////////////////////////////////////////// | |
| 8 | 171 // helper to discard the strings held by a string_set |
| 0 | 172 // |
| 9 | 173 static void discard(string_set &s); |
| 174 static void discard(string_set &s) { | |
| 8 | 175 for (string_set::iterator i=s.begin(); i!=s.end(); i++) { |
| 176 free(*i); | |
| 177 } | |
| 9 | 178 s.clear(); |
| 8 | 179 } |
| 0 | 180 |
| 12 | 181 //////////////////////////////////////////////// |
| 182 // helper to register a string in a string set | |
| 183 // | |
| 184 static char* register_string(string_set &s, char *name); | |
| 185 static char* register_string(string_set &s, char *name) { | |
| 186 string_set::iterator i = s.find(name); | |
| 187 if (i != s.end()) return *i; | |
| 188 char *x = strdup(name); | |
| 189 s.insert(x); | |
| 190 return x; | |
| 191 } | |
| 192 | |
| 16 | 193 //////////////////////////////////////////////// |
| 194 // syslog a message | |
| 195 // | |
| 196 static void my_syslog(char *text); | |
| 197 static void my_syslog(char *text) { | |
| 198 pthread_mutex_lock(&syslog_mutex); | |
| 199 openlog("dnsbl", LOG_PID, LOG_MAIL); | |
| 200 syslog(LOG_NOTICE, "%s", text); | |
| 201 closelog(); | |
| 202 pthread_mutex_unlock(&syslog_mutex); | |
| 203 } | |
| 204 | |
| 205 | |
| 12 | 206 // include the content scanner |
| 207 #include "scanner.cpp" | |
| 208 | |
| 209 | |
| 0 | 210 //////////////////////////////////////////////// |
| 211 // mail filter private data, held for us by sendmail | |
| 212 // | |
| 213 struct mlfiPriv | |
| 214 { | |
| 8 | 215 // connection specific data |
| 216 CONFIG *pc; // global context with our maps | |
| 217 int ip; // ip4 address of the smtp client | |
| 218 map<DNSBLP, status> checked; // status from those lists | |
| 219 // message specific data | |
| 0 | 220 char *mailaddr; // envelope from value |
| 221 bool authenticated; // client authenticated? if so, suppress all dnsbl checks | |
| 8 | 222 bool have_whites; // have at least one whitelisted recipient? need to accept content and remove all non-whitelisted recipients if it fails |
| 223 bool only_whites; // every recipient is whitelisted? | |
| 24 | 224 string_set non_whites; // remember the non-whitelisted recipients so we can remove them if need be |
| 225 recorder *memory; // memory for the content scanner | |
| 8 | 226 url_scanner *scanner; // object to handle body scanning |
| 0 | 227 mlfiPriv(); |
| 228 ~mlfiPriv(); | |
| 8 | 229 void reset(bool final = false); // for a new message |
| 0 | 230 }; |
| 231 mlfiPriv::mlfiPriv() { | |
| 232 pthread_mutex_lock(&config_mutex); | |
| 233 pc = config; | |
| 234 pc->reference_count++; | |
| 235 pthread_mutex_unlock(&config_mutex); | |
| 8 | 236 ip = 0; |
| 237 mailaddr = NULL; | |
| 238 authenticated = false; | |
| 239 have_whites = false; | |
| 240 only_whites = true; | |
| 24 | 241 memory = new recorder(&pc->html_tags); |
| 242 scanner = new url_scanner(memory); | |
| 0 | 243 } |
| 244 mlfiPriv::~mlfiPriv() { | |
| 245 pthread_mutex_lock(&config_mutex); | |
| 246 pc->reference_count--; | |
| 247 pthread_mutex_unlock(&config_mutex); | |
| 8 | 248 reset(true); |
| 249 } | |
| 250 void mlfiPriv::reset(bool final) { | |
| 0 | 251 if (mailaddr) free(mailaddr); |
| 24 | 252 discard(non_whites); |
| 253 delete memory; | |
| 8 | 254 delete scanner; |
| 255 if (!final) { | |
| 256 mailaddr = NULL; | |
| 257 authenticated = false; | |
| 258 have_whites = false; | |
| 259 only_whites = true; | |
| 24 | 260 memory = new recorder(&pc->html_tags); |
| 261 scanner = new url_scanner(memory); | |
| 8 | 262 } |
| 0 | 263 } |
| 264 | |
| 265 #define MLFIPRIV ((struct mlfiPriv *) smfi_getpriv(ctx)) | |
| 266 | |
| 267 | |
| 268 //////////////////////////////////////////////// | |
| 269 // register a global string | |
| 270 // | |
| 271 static char* register_string(char *name); | |
| 272 static char* register_string(char *name) { | |
| 12 | 273 return register_string(all_strings, name); |
| 0 | 274 } |
| 275 | |
| 276 | |
| 277 static char* next_token(char *delim); | |
| 278 static char* next_token(char *delim) { | |
| 279 char *name = strtok(NULL, delim); | |
| 280 if (!name) return name; | |
| 281 return register_string(name); | |
| 282 } | |
| 283 | |
| 284 | |
| 285 //////////////////////////////////////////////// | |
| 286 // lookup an email address in the env_from or env_to maps | |
| 287 // | |
| 288 static char* lookup1(char *email, string_map map); | |
| 289 static char* lookup1(char *email, string_map map) { | |
| 290 string_map::iterator i = map.find(email); | |
| 291 if (i != map.end()) return (*i).second; | |
| 292 char *x = strchr(email, '@'); | |
| 293 if (!x) return DEFAULT; | |
| 294 x++; | |
| 295 i = map.find(x); | |
| 296 if (i != map.end()) return (*i).second; | |
| 297 return DEFAULT; | |
| 298 } | |
| 299 | |
| 300 | |
| 301 //////////////////////////////////////////////// | |
| 302 // lookup an email address in the env_from or env_to maps | |
| 303 // this email address is passed in from sendmail, and will | |
| 304 // always be enclosed in <>. It may have mixed case, just | |
| 305 // as the mail client sent it. | |
| 306 // | |
| 307 static char* lookup(char* email, string_map map); | |
| 308 static char* lookup(char* email, string_map map) { | |
| 309 int n = strlen(email)-2; | |
| 310 if (n < 1) return DEFAULT; // malformed | |
| 311 char *key = strdup(email+1); | |
| 312 key[n] = '\0'; | |
| 313 for (int i=0; i<n; i++) key[i] = tolower(key[i]); | |
| 314 char *rc = lookup1(key, map); | |
| 315 free(key); | |
| 316 return rc; | |
| 317 } | |
| 318 | |
| 319 | |
| 320 //////////////////////////////////////////////// | |
| 321 // find the dnsbl with a specific name | |
| 322 // | |
| 323 static DNSBLP find_dnsbl(CONFIG &dc, char *name); | |
| 324 static DNSBLP find_dnsbl(CONFIG &dc, char *name) { | |
| 325 dnsblp_map::iterator i = dc.dnsbls.find(name); | |
| 326 if (i == dc.dnsbls.end()) return NULL; | |
| 327 return (*i).second; | |
| 328 } | |
| 329 | |
| 330 | |
| 331 //////////////////////////////////////////////// | |
| 332 // find the dnsbll with a specific name | |
| 333 // | |
| 334 static DNSBLLP find_dnsbll(CONFIG &dc, char *name); | |
| 335 static DNSBLLP find_dnsbll(CONFIG &dc, char *name) { | |
| 336 dnsbllp_map::iterator i = dc.dnsblls.find(name); | |
| 337 if (i == dc.dnsblls.end()) return NULL; | |
| 338 return (*i).second; | |
| 339 } | |
| 340 | |
| 341 | |
| 342 //////////////////////////////////////////////// | |
| 343 // find the envfrom map with a specific name | |
| 344 // | |
| 345 static string_map* find_from_map(CONFIG &dc, char *name); | |
| 346 static string_map* find_from_map(CONFIG &dc, char *name) { | |
| 347 from_map::iterator i = dc.env_from.find(name); | |
| 348 if (i == dc.env_from.end()) return NULL; | |
| 349 return (*i).second; | |
| 350 } | |
| 351 | |
| 352 | |
| 353 static string_map& really_find_from_map(CONFIG &dc, char *name); | |
| 354 static string_map& really_find_from_map(CONFIG &dc, char *name) { | |
| 355 string_map *sm = find_from_map(dc, name); | |
| 356 if (!sm) { | |
| 357 sm = new string_map; | |
| 358 dc.env_from[name] = sm; | |
| 359 } | |
| 360 return *sm; | |
| 361 } | |
| 362 | |
| 363 | |
| 364 //////////////////////////////////////////////// | |
| 8 | 365 // |
| 366 // ask a dns question and get an A record answer - we don't try | |
| 367 // very hard, just using the default resolver retry settings. | |
| 368 // If we cannot get an answer, we just accept the mail. The | |
| 369 // caller must ensure thread safety. | |
| 370 // | |
| 0 | 371 // |
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372 static int dns_interface(char *question, bool maybe_ip); |
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373 static int dns_interface(char *question, bool maybe_ip) { |
| 16 | 374 #ifdef NS_PACKETSZ |
| 8 | 375 u_char answer[NS_PACKETSZ]; |
| 376 int length = res_search(question, ns_c_in, ns_t_a, answer, sizeof(answer)); | |
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377 if (length >= 0) { // no error yet |
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378 // parse the answer |
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379 ns_msg handle; |
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380 ns_rr rr; |
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381 if (ns_initparse(answer, length, &handle) == 0) { |
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382 int rrnum = 0; |
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383 while (ns_parserr(&handle, ns_s_an, rrnum++, &rr) == 0) { |
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384 if (ns_rr_type(rr) == ns_t_a) { |
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385 int address; |
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386 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); |
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387 return address; |
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388 } |
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389 } |
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390 } |
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391 } |
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392 if (maybe_ip) { |
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393 // might be a bare ip address |
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394 in_addr ip; |
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395 if (inet_aton(question, &ip)) { |
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396 return ip.s_addr; |
| 8 | 397 } |
| 398 } | |
| 399 return 0; | |
| 16 | 400 #else |
| 401 struct hostent *host = gethostbyname(question); | |
| 402 if (!host) return 0; | |
| 403 if (host->h_addrtype != AF_INET) return 0; | |
| 404 int address; | |
| 405 memcpy(&address, host->h_addr, sizeof(address)); | |
| 406 return address; | |
| 407 #endif | |
| 8 | 408 } |
| 409 | |
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410 static int protected_dns_interface(char *question, bool maybe_ip); |
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411 static int protected_dns_interface(char *question, bool maybe_ip) { |
| 8 | 412 int ans; |
| 413 pthread_mutex_lock(&resolve_mutex); | |
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414 ans = dns_interface(question, maybe_ip); |
| 8 | 415 pthread_mutex_unlock(&resolve_mutex); |
| 416 return ans; | |
| 417 | |
| 418 } | |
| 419 | |
| 420 //////////////////////////////////////////////// | |
| 421 // check a single dnsbl | |
| 422 // | |
| 423 static status check_single(int ip, char *suffix); | |
| 424 static status check_single(int ip, char *suffix) { | |
| 0 | 425 // make a dns question |
| 426 const u_char *src = (const u_char *)&ip; | |
| 427 if (src[0] == 127) return oksofar; // don't do dns lookups on localhost | |
| 16 | 428 #ifdef NS_MAXDNAME |
| 0 | 429 char question[NS_MAXDNAME]; |
| 16 | 430 #else |
| 431 char question[1000]; | |
| 432 #endif | |
| 8 | 433 snprintf(question, sizeof(question), "%u.%u.%u.%u.%s.", src[3], src[2], src[1], src[0], suffix); |
| 434 // ask the question, if we get an A record it implies a blacklisted ip address | |
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435 return (protected_dns_interface(question, false)) ? reject : oksofar; |
| 8 | 436 } |
| 437 | |
| 438 | |
| 439 //////////////////////////////////////////////// | |
| 440 // check a single dnsbl | |
| 441 // | |
| 442 static status check_single(int ip, DNSBL &bl); | |
| 443 static status check_single(int ip, DNSBL &bl) { | |
| 444 return check_single(ip, bl.suffix); | |
| 0 | 445 } |
| 446 | |
| 447 | |
| 448 //////////////////////////////////////////////// | |
| 449 // check the dnsbls specified for this recipient | |
| 450 // | |
| 451 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist); | |
| 452 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist) { | |
| 453 if (priv.authenticated) return oksofar; | |
| 454 if (!dnsbllp) return oksofar; | |
| 455 DNSBLL &dnsbll = *dnsbllp; | |
| 456 for (DNSBLL::iterator i=dnsbll.begin(); i!=dnsbll.end(); i++) { | |
| 457 DNSBLP dp = *i; // non null by construction | |
| 458 status st; | |
| 459 map<DNSBLP, status>::iterator f = priv.checked.find(dp); | |
| 460 if (f == priv.checked.end()) { | |
| 461 // have not checked this list yet | |
| 8 | 462 st = check_single(priv.ip, *dp); |
| 0 | 463 rejectlist = dp; |
| 464 priv.checked[dp] = st; | |
| 465 } | |
| 466 else { | |
| 467 st = (*f).second; | |
| 468 rejectlist = (*f).first; | |
| 469 } | |
| 470 if (st == reject) return st; | |
| 471 } | |
| 472 return oksofar; | |
| 473 } | |
| 474 | |
| 475 | |
| 476 //////////////////////////////////////////////// | |
| 8 | 477 // check the dnsbls specified for this recipient |
| 478 // | |
| 16 | 479 static status check_hosts(mlfiPriv &priv, char *&host, int &ip); |
| 480 static status check_hosts(mlfiPriv &priv, char *&host, int &ip) { | |
| 8 | 481 CONFIG &dc = *priv.pc; |
| 482 if (!dc.content_suffix) return oksofar; | |
| 483 int count = 0; | |
| 24 | 484 for (string_set::iterator i=priv.memory->hosts.begin(); i!=priv.memory->hosts.end(); i++) { |
| 8 | 485 count++; |
| 12 | 486 if (count > 20) return oksofar; // silly to check too many hosts |
| 16 | 487 host = *i; |
| 488 if (debug_syslog) { | |
| 489 char buf[200]; | |
| 490 snprintf(buf, sizeof(buf), "looking for host %s", host); | |
| 491 my_syslog(buf); | |
| 492 } | |
|
23
06de5ab6a232
add url decoding stage, allow http:/ single / in yahoo redirector, allow ip address hostnames
carl
parents:
22
diff
changeset
|
493 ip = protected_dns_interface(host, true); |
| 8 | 494 if (ip) { |
| 16 | 495 if (debug_syslog) { |
| 496 char adr[sizeof "255.255.255.255"]; | |
| 497 adr[0] = '\0'; | |
| 498 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 499 char buf[200]; | |
| 500 snprintf(buf, sizeof(buf), "found host %s at %s", host, adr); | |
| 501 my_syslog(buf); | |
| 502 } | |
| 8 | 503 status st = check_single(ip, dc.content_suffix); |
| 504 if (st == reject) return st; | |
| 505 } | |
| 506 } | |
| 24 | 507 host = NULL; |
| 508 int bad = priv.memory->bad_html_tags; | |
| 509 int lim = priv.pc->bad_tag_limit; | |
| 510 if ((bad > lim) && (lim > 0)) return reject; | |
| 9 | 511 return oksofar; |
| 8 | 512 } |
| 513 | |
| 514 | |
| 515 //////////////////////////////////////////////// | |
| 0 | 516 // start of sendmail milter interfaces |
| 517 // | |
| 518 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr) | |
| 519 { | |
| 520 // allocate some private memory | |
| 521 mlfiPriv *priv = new mlfiPriv; | |
| 522 if (hostaddr->sa_family == AF_INET) { | |
| 523 priv->ip = ((struct sockaddr_in *)hostaddr)->sin_addr.s_addr; | |
| 524 } | |
| 525 | |
| 526 // save the private data | |
| 527 smfi_setpriv(ctx, (void*)priv); | |
| 528 | |
| 529 // continue processing | |
| 530 return SMFIS_CONTINUE; | |
| 531 } | |
| 532 | |
| 533 sfsistat mlfi_envfrom(SMFICTX *ctx, char **from) | |
| 534 { | |
| 535 mlfiPriv &priv = *MLFIPRIV; | |
| 536 priv.mailaddr = strdup(from[0]); | |
| 537 priv.authenticated = (smfi_getsymval(ctx, "{auth_authen}") != NULL); | |
| 538 return SMFIS_CONTINUE; | |
| 539 } | |
| 540 | |
| 541 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **rcpt) | |
| 542 { | |
| 543 DNSBLP rejectlist = NULL; // list that caused the reject | |
| 544 status st = oksofar; | |
| 545 mlfiPriv &priv = *MLFIPRIV; | |
| 546 CONFIG &dc = *priv.pc; | |
| 547 char *rcptaddr = rcpt[0]; | |
| 548 char *dnsname = lookup(rcptaddr, dc.env_to_dnsbll); | |
| 549 char *fromname = lookup(rcptaddr, dc.env_to_chkfrom); | |
| 550 if ((strcmp(dnsname, BLACK) == 0) || | |
| 551 (strcmp(fromname, BLACK) == 0)) { | |
| 552 st = black; // two options to blacklist this recipient | |
| 553 } | |
| 554 else if (strcmp(fromname, WHITE) == 0) { | |
| 555 st = white; | |
| 556 } | |
| 557 else { | |
| 558 // check an env_from map | |
| 559 string_map *sm = find_from_map(dc, fromname); | |
| 560 if (sm != NULL) { | |
| 561 fromname = lookup(priv.mailaddr, *sm); // returns default if name not in map | |
| 562 if (strcmp(fromname, BLACK) == 0) { | |
| 563 st = black; // blacklist this envelope from value | |
| 564 } | |
| 565 if (strcmp(fromname, WHITE) == 0) { | |
| 566 st = white; // blacklist this envelope from value | |
| 567 } | |
| 568 } | |
| 569 } | |
| 570 if ((st == oksofar) && (strcmp(dnsname, WHITE) != 0)) { | |
| 571 // check dns lists | |
| 572 st = check_dnsbl(priv, find_dnsbll(dc, dnsname), rejectlist); | |
| 573 } | |
| 574 | |
| 575 if (st == reject) { | |
| 576 // reject the recipient based on some dnsbl | |
| 577 char adr[sizeof "255.255.255.255"]; | |
| 578 adr[0] = '\0'; | |
| 8 | 579 inet_ntop(AF_INET, (const u_char *)&priv.ip, adr, sizeof(adr)); |
| 0 | 580 char buf[2000]; |
| 581 snprintf(buf, sizeof(buf), rejectlist->message, adr, adr); | |
| 582 smfi_setreply(ctx, "550", "5.7.1", buf); | |
| 583 return SMFIS_REJECT; | |
| 584 } | |
| 585 else if (st == black) { | |
| 586 // reject the recipient based on blacklisting either from or to | |
| 587 smfi_setreply(ctx, "550", "5.7.1", "no such user"); | |
| 588 return SMFIS_REJECT; | |
| 589 } | |
| 590 else { | |
| 591 // accept the recipient | |
| 8 | 592 if (st == oksofar) { |
| 593 // but remember the non-whites | |
| 12 | 594 register_string(priv.non_whites, rcptaddr); |
| 8 | 595 priv.only_whites = false; |
| 596 } | |
| 597 if (st == white) { | |
| 598 priv.have_whites = true; | |
| 599 } | |
| 0 | 600 return SMFIS_CONTINUE; |
| 601 } | |
| 602 } | |
| 603 | |
| 8 | 604 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len) |
| 0 | 605 { |
| 606 mlfiPriv &priv = *MLFIPRIV; | |
| 8 | 607 if (priv.authenticated) return SMFIS_CONTINUE; |
| 608 if (priv.only_whites) return SMFIS_CONTINUE; | |
| 609 priv.scanner->scan(data, len); | |
| 11 | 610 return SMFIS_CONTINUE; |
| 8 | 611 } |
| 612 | |
| 613 sfsistat mlfi_eom(SMFICTX *ctx) | |
| 614 { | |
| 615 sfsistat rc; | |
| 616 mlfiPriv &priv = *MLFIPRIV; | |
| 16 | 617 char *host = NULL; |
| 8 | 618 int ip; |
| 619 // process end of message | |
| 620 if (priv.authenticated || | |
| 621 priv.only_whites || | |
| 16 | 622 (check_hosts(priv, host, ip) == oksofar)) rc = SMFIS_CONTINUE; |
| 8 | 623 else { |
| 624 if (!priv.have_whites) { | |
| 625 // can reject the entire message | |
| 626 char buf[2000]; | |
| 24 | 627 if (!host) { |
| 628 // must be rejected due to excessive bad html tags | |
| 629 snprintf(buf, sizeof(buf), priv.pc->limit_message); | |
| 630 } | |
| 631 else { | |
| 632 char adr[sizeof "255.255.255.255"]; | |
| 633 adr[0] = '\0'; | |
| 634 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 635 snprintf(buf, sizeof(buf), priv.pc->content_message, host, adr); | |
| 636 } | |
| 8 | 637 smfi_setreply(ctx, "550", "5.7.1", buf); |
| 638 rc = SMFIS_REJECT; | |
| 639 } | |
| 640 else { | |
| 641 // need to accept it but remove the recipients that don't want it | |
| 642 for (string_set::iterator i=priv.non_whites.begin(); i!=priv.non_whites.end(); i++) { | |
| 643 char *rcpt = *i; | |
| 644 smfi_delrcpt(ctx, rcpt); | |
| 645 } | |
| 646 rc = SMFIS_CONTINUE; | |
| 647 } | |
| 0 | 648 } |
| 8 | 649 // reset for a new message on the same connection |
| 650 mlfi_abort(ctx); | |
| 651 return rc; | |
| 652 } | |
| 653 | |
| 654 sfsistat mlfi_abort(SMFICTX *ctx) | |
| 655 { | |
| 656 mlfiPriv &priv = *MLFIPRIV; | |
| 657 priv.reset(); | |
| 0 | 658 return SMFIS_CONTINUE; |
| 659 } | |
| 660 | |
| 661 sfsistat mlfi_close(SMFICTX *ctx) | |
| 662 { | |
| 663 mlfiPriv *priv = MLFIPRIV; | |
| 664 if (!priv) return SMFIS_CONTINUE; | |
| 665 delete priv; | |
| 666 smfi_setpriv(ctx, NULL); | |
| 667 return SMFIS_CONTINUE; | |
| 668 } | |
| 669 | |
| 670 struct smfiDesc smfilter = | |
| 671 { | |
| 672 "DNSBL", // filter name | |
| 673 SMFI_VERSION, // version code -- do not change | |
| 674 SMFIF_DELRCPT, // flags | |
| 675 mlfi_connect, // connection info filter | |
| 676 NULL, // SMTP HELO command filter | |
| 677 mlfi_envfrom, // envelope sender filter | |
| 678 mlfi_envrcpt, // envelope recipient filter | |
| 679 NULL, // header filter | |
| 680 NULL, // end of header | |
| 8 | 681 mlfi_body, // body block filter |
| 682 mlfi_eom, // end of message | |
| 683 mlfi_abort, // message aborted | |
| 0 | 684 mlfi_close, // connection cleanup |
| 685 }; | |
| 686 | |
| 687 | |
| 688 static void dumpit(char *name, string_map map); | |
| 689 static void dumpit(char *name, string_map map) { | |
| 9 | 690 fprintf(stdout, "\n"); |
| 0 | 691 for (string_map::iterator i=map.begin(); i!=map.end(); i++) { |
| 9 | 692 fprintf(stdout, "%s %s->%s\n", name, (*i).first, (*i).second); |
| 0 | 693 } |
| 694 } | |
| 695 | |
| 696 | |
| 697 static void dumpit(from_map map); | |
| 698 static void dumpit(from_map map) { | |
| 699 for (from_map::iterator i=map.begin(); i!=map.end(); i++) { | |
| 3 | 700 char buf[2000]; |
| 701 snprintf(buf, sizeof(buf), "envelope from map for %s", (*i).first); | |
| 0 | 702 string_map *sm = (*i).second; |
| 3 | 703 dumpit(buf, *sm); |
| 0 | 704 } |
| 705 } | |
| 706 | |
| 707 | |
| 3 | 708 static void dumpit(CONFIG &dc); |
| 709 static void dumpit(CONFIG &dc) { | |
| 5 | 710 dumpit(dc.env_from); |
| 711 dumpit("envelope to (dnsbl list)", dc.env_to_dnsbll); | |
| 712 dumpit("envelope to (from map)", dc.env_to_chkfrom); | |
| 9 | 713 fprintf(stdout, "\ndnsbls\n"); |
| 0 | 714 for (dnsblp_map::iterator i=dc.dnsbls.begin(); i!=dc.dnsbls.end(); i++) { |
| 9 | 715 fprintf(stdout, "%s %s %s\n", (*i).first, (*i).second->suffix, (*i).second->message); |
| 0 | 716 } |
| 9 | 717 fprintf(stdout, "\ndnsbl_lists\n"); |
| 0 | 718 for (dnsbllp_map::iterator i=dc.dnsblls.begin(); i!=dc.dnsblls.end(); i++) { |
| 719 char *name = (*i).first; | |
| 720 DNSBLL &dl = *((*i).second); | |
| 9 | 721 fprintf(stdout, "%s", name); |
| 0 | 722 for (DNSBLL::iterator j=dl.begin(); j!=dl.end(); j++) { |
| 723 DNSBL &d = **j; | |
| 9 | 724 fprintf(stdout, " %s", d.suffix); |
| 0 | 725 } |
| 9 | 726 fprintf(stdout, "\n"); |
| 0 | 727 } |
| 9 | 728 if (dc.content_suffix) { |
| 729 fprintf(stdout, "\ncontent filtering enabled with %s %s\n", dc.content_suffix, dc.content_message); | |
| 730 } | |
| 24 | 731 if (dc.bad_tag_limit) { |
| 732 fprintf(stdout, "\ncontent filtering for excessive html tags enabled with limit %d %s\n", dc.bad_tag_limit, dc.limit_message); | |
| 733 } | |
| 9 | 734 fprintf(stdout, "\nfiles\n"); |
| 3 | 735 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { |
| 736 char *f = *i; | |
| 9 | 737 fprintf(stdout, "config includes %s\n", f); |
| 3 | 738 } |
| 739 } | |
| 740 | |
| 741 | |
| 742 //////////////////////////////////////////////// | |
| 743 // check for redundant or recursive include files | |
| 744 // | |
| 745 static bool ok_to_include(CONFIG &dc, char *fn); | |
| 746 static bool ok_to_include(CONFIG &dc, char *fn) { | |
| 747 if (!fn) return false; | |
| 748 bool ok = true; | |
| 749 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 750 char *f = *i; | |
| 751 if (strcmp(f, fn) == 0) { | |
| 752 my_syslog("redundant or recursive include file detected"); | |
| 753 ok = false; | |
| 754 break; | |
| 755 } | |
| 756 } | |
| 757 return ok; | |
| 0 | 758 } |
| 759 | |
| 760 | |
| 761 //////////////////////////////////////////////// | |
| 762 // load a single config file | |
| 763 // | |
| 3 | 764 static void load_conf_dcc(CONFIG &dc, char *name, char *fn); |
| 765 static void load_conf_dcc(CONFIG &dc, char *name, char *fn) { | |
| 766 dc.config_files.push_back(fn); | |
| 767 char *list = BLACK; | |
| 768 const int LINE_SIZE = 2000; | |
| 769 ifstream is(fn); | |
| 770 if (is.fail()) return; | |
| 771 char line[LINE_SIZE]; | |
| 772 char *delim = " \t"; | |
| 773 int curline = 0; | |
| 774 while (!is.eof()) { | |
| 775 is.getline(line, LINE_SIZE); | |
| 776 curline++; | |
| 777 int n = strlen(line); | |
| 778 if (!n) continue; | |
| 779 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 780 if (line[0] == '#') continue; | |
| 781 char *head = line; | |
| 782 if (strspn(line, delim) == 0) { | |
| 783 // have a leading ok/many tag to fetch | |
| 784 char *cmd = strtok(line, delim); | |
| 785 if (strcmp(cmd, MANY) == 0) list = BLACK; | |
| 786 else if (strcmp(cmd, OK) == 0) list = WHITE; | |
| 787 head = cmd + strlen(cmd) + 1; | |
| 788 } | |
| 789 char *cmd = strtok(head, delim); | |
| 790 if (!cmd) continue; | |
| 791 if (strcmp(cmd, "env_from") == 0) { | |
| 792 char *from = next_token(delim); | |
| 793 if (from) { | |
| 794 string_map &fm = really_find_from_map(dc, name); | |
| 795 fm[from] = list; | |
| 796 } | |
| 797 } | |
| 798 else if (strcmp(cmd, "env_to") == 0) { | |
| 799 char *to = next_token(delim); | |
| 800 if (to) { | |
| 801 dc.env_to_dnsbll[to] = list; | |
| 802 dc.env_to_chkfrom[to] = list; | |
| 803 } | |
| 804 } | |
| 805 else if (strcmp(cmd, "substitute") == 0) { | |
| 806 char *tag = next_token(delim); | |
| 807 if (tag && (strcmp(tag, "mail_host") == 0)) { | |
| 808 char *from = next_token(delim); | |
| 809 if (from) { | |
| 810 string_map &fm = really_find_from_map(dc, name); | |
| 811 fm[from] = list; | |
| 812 } | |
| 813 } | |
| 814 } | |
| 815 else if (strcmp(cmd, "include") == 0) { | |
| 816 char *fn = next_token(delim); | |
| 817 if (ok_to_include(dc, fn)) { | |
| 818 load_conf_dcc(dc, name, fn); | |
| 819 } | |
| 820 } | |
| 821 | |
| 822 } | |
| 823 is.close(); | |
| 824 } | |
| 825 | |
| 826 | |
| 0 | 827 static void load_conf(CONFIG &dc, char *fn); |
| 828 static void load_conf(CONFIG &dc, char *fn) { | |
| 829 dc.config_files.push_back(fn); | |
| 830 map<char*, int, ltstr> commands; | |
| 24 | 831 enum {dummy, content, htmllimit, htmltag, dnsbl, dnsbll, envfrom, envto, include, includedcc}; |
| 8 | 832 commands["content" ] = content; |
| 24 | 833 commands["html_limit" ] = htmllimit; |
| 834 commands["html_tag" ] = htmltag; | |
| 3 | 835 commands["dnsbl" ] = dnsbl; |
| 836 commands["dnsbl_list" ] = dnsbll; | |
| 837 commands["env_from" ] = envfrom; | |
| 838 commands["env_to" ] = envto; | |
| 839 commands["include" ] = include; | |
| 840 commands["include_dcc"] = includedcc; | |
| 0 | 841 const int LINE_SIZE = 2000; |
| 842 ifstream is(fn); | |
| 843 if (is.fail()) return; | |
| 844 char line[LINE_SIZE]; | |
| 845 char orig[LINE_SIZE]; | |
| 846 char *delim = " \t"; | |
| 847 int curline = 0; | |
| 848 while (!is.eof()) { | |
| 849 is.getline(line, LINE_SIZE); | |
| 850 snprintf(orig, sizeof(orig), "%s", line); | |
| 851 curline++; | |
| 852 int n = strlen(line); | |
| 853 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 854 char *cmd = strtok(line, delim); | |
| 855 if (cmd && (cmd[0] != '#') && (cmd[0] != '\0')) { | |
| 856 // have a decent command | |
| 857 bool processed = false; | |
| 858 switch (commands[cmd]) { | |
| 8 | 859 case content: { |
| 860 char *suff = strtok(NULL, delim); | |
| 24 | 861 if (!suff) break; // no dns suffix |
| 8 | 862 char *msg = suff + strlen(suff); |
| 863 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 864 msg = strchr(msg+1, '\''); | |
| 865 if (!msg) break; // no reply message template | |
| 866 msg++; // move over the leading ' | |
| 867 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 868 char *last = strchr(msg, '\''); | |
| 869 if (!last) break; // no trailing quote | |
| 870 *last = '\0'; // make it a null terminator | |
| 871 dc.content_suffix = register_string(suff); | |
| 872 dc.content_message = register_string(msg); | |
| 873 processed = true; | |
| 874 } break; | |
| 875 | |
| 24 | 876 case htmllimit: { |
| 877 char *limit = strtok(NULL, delim); | |
| 878 if (!limit) break; // no integer limit | |
| 879 char *msg = limit + strlen(limit); | |
| 880 if ((msg - line) >= strlen(orig)) break; // line ended with the limit | |
| 881 msg = strchr(msg+1, '\''); | |
| 882 if (!msg) break; // no reply message template | |
| 883 msg++; // move over the leading ' | |
| 884 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 885 char *last = strchr(msg, '\''); | |
| 886 if (!last) break; // no trailing quote | |
| 887 *last = '\0'; // make it a null terminator | |
| 888 dc.bad_tag_limit = atoi(limit); | |
| 889 dc.limit_message = register_string(msg); | |
| 890 processed = true; | |
| 891 } break; | |
| 892 | |
| 893 case htmltag: { | |
| 894 char *tag = next_token(delim); | |
| 895 if (!tag) break; // no html tag value | |
| 896 dc.html_tags.insert(tag); | |
| 897 processed = true; | |
| 898 } break; | |
| 899 | |
| 0 | 900 case dnsbl: { |
| 901 // have a new dnsbl to use | |
| 902 char *name = next_token(delim); | |
| 903 if (!name) break; // no name name | |
| 904 if (find_dnsbl(dc, name)) break; // duplicate entry | |
| 905 char *suff = strtok(NULL, delim); | |
| 906 if (!suff) break; // no dns suffic | |
| 907 char *msg = suff + strlen(suff); | |
| 908 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 909 msg = strchr(msg+1, '\''); | |
| 910 if (!msg) break; // no reply message template | |
| 911 msg++; // move over the leading ' | |
| 912 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 913 char *last = strchr(msg, '\''); | |
| 914 if (!last) break; // no trailing quote | |
| 915 *last = '\0'; // make it a null terminator | |
| 916 dc.dnsbls[name] = new DNSBL(register_string(suff), register_string(msg)); | |
| 917 processed = true; | |
| 918 } break; | |
| 919 | |
| 920 case dnsbll: { | |
| 921 // define a new combination of dnsbls | |
| 922 char *name = next_token(delim); | |
| 923 if (!name) break; | |
| 924 if (find_dnsbll(dc, name)) break; // duplicate entry | |
| 925 char *list = next_token(delim); | |
| 926 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 927 DNSBLLP d = new DNSBLL; | |
| 928 DNSBLP p = find_dnsbl(dc, list); | |
| 929 if (p) d->push_back(p); | |
| 930 while (true) { | |
| 931 list = next_token(delim); | |
| 932 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 933 DNSBLP p = find_dnsbl(dc, list); | |
| 934 if (p) d->push_back(p); | |
| 935 } | |
| 936 dc.dnsblls[name] = d; | |
| 937 processed = true; | |
| 938 } break; | |
| 939 | |
| 940 case envfrom: { | |
| 941 // add an entry into the named string_map | |
| 942 char *name = next_token(delim); | |
| 943 if (!name) break; | |
| 944 char *from = next_token(delim); | |
| 945 if (!from) break; | |
| 946 char *list = next_token(delim); | |
| 947 if (!list) break; | |
| 948 if ((strcmp(list, WHITE) == 0) || | |
| 949 (strcmp(list, BLACK) == 0)) { | |
| 950 string_map &fm = really_find_from_map(dc, name); | |
| 951 fm[from] = list; | |
| 952 processed = true; | |
| 953 } | |
| 954 else { | |
| 955 // list may be the name of a previously defined from_map | |
| 956 string_map *m = find_from_map(dc, list); | |
| 957 if (m && (strcmp(list,name) != 0)) { | |
| 958 string_map &pm = *m; | |
| 959 string_map &fm = really_find_from_map(dc, name); | |
| 960 fm.insert(pm.begin(), pm.end()); | |
| 961 processed = true; | |
| 962 } | |
| 963 } | |
| 964 } break; | |
| 965 | |
| 966 case envto: { | |
| 967 // define the dnsbl_list and env_from maps to use for this recipient | |
| 968 char *to = next_token(delim); | |
| 969 if (!to) break; | |
| 970 char *list = next_token(delim); | |
| 971 if (!list) break; | |
| 972 char *from = next_token(delim); | |
| 973 if (!from) break; | |
| 974 dc.env_to_dnsbll[to] = list; | |
| 975 dc.env_to_chkfrom[to] = from; | |
| 976 processed = true; | |
| 977 } break; | |
| 978 | |
| 979 case include: { | |
| 980 char *fn = next_token(delim); | |
| 3 | 981 if (ok_to_include(dc, fn)) { |
| 982 load_conf(dc, fn); | |
| 983 processed = true; | |
| 984 } | |
| 985 } break; | |
| 986 | |
| 987 case includedcc: { | |
| 988 char *name = next_token(delim); | |
| 989 if (!name) break; | |
| 990 char *fn = next_token(delim); | |
| 991 if (ok_to_include(dc, fn)) { | |
| 992 load_conf_dcc(dc, name, fn); | |
| 993 processed = true; | |
| 0 | 994 } |
| 995 } break; | |
| 996 | |
| 997 default: { | |
| 998 } break; | |
| 999 } | |
| 1000 if (!processed) { | |
| 1001 pthread_mutex_lock(&syslog_mutex); | |
| 1002 openlog("dnsbl", LOG_PID, LOG_MAIL); | |
| 1003 syslog(LOG_ERR, "ignoring file %s line %d : %s\n", fn, curline, orig); | |
| 1004 closelog(); | |
| 1005 pthread_mutex_unlock(&syslog_mutex); | |
| 1006 } | |
| 1007 } | |
| 1008 } | |
| 1009 is.close(); | |
| 1010 } | |
| 1011 | |
| 1012 | |
| 1013 //////////////////////////////////////////////// | |
| 1014 // reload the config | |
| 1015 // | |
| 1016 static CONFIG* new_conf(); | |
| 1017 static CONFIG* new_conf() { | |
| 1018 my_syslog("loading new configuration"); | |
| 1019 CONFIG *newc = new CONFIG; | |
| 1020 load_conf(*newc, "dnsbl.conf"); | |
| 1021 newc->load_time = time(NULL); | |
| 1022 return newc; | |
| 1023 } | |
| 1024 | |
| 1025 | |
| 1026 //////////////////////////////////////////////// | |
| 1027 // thread to watch the old config files for changes | |
| 1028 // and reload when needed. we also cleanup old | |
| 1029 // configs whose reference count has gone to zero. | |
| 1030 // | |
| 1031 static void* config_loader(void *arg); | |
| 1032 static void* config_loader(void *arg) { | |
| 1033 typedef set<CONFIG *> configp_set; | |
| 1034 configp_set old_configs; | |
| 18 | 1035 while (loader_run) { |
| 0 | 1036 sleep(180); // look for modifications every 3 minutes |
| 18 | 1037 if (!loader_run) break; |
| 0 | 1038 CONFIG &dc = *config; |
| 1039 time_t then = dc.load_time; | |
| 1040 struct stat st; | |
| 1041 bool reload = false; | |
| 1042 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 1043 char *fn = *i; | |
| 1044 if (stat(fn, &st)) reload = true; // file disappeared | |
| 1045 else if (st.st_mtime > then) reload = true; // file modified | |
| 1046 if (reload) break; | |
| 1047 } | |
| 1048 if (reload) { | |
| 1049 CONFIG *newc = new_conf(); | |
| 1050 // replace the global config pointer | |
| 1051 pthread_mutex_lock(&config_mutex); | |
| 1052 CONFIG *old = config; | |
| 1053 config = newc; | |
| 1054 pthread_mutex_unlock(&config_mutex); | |
| 1055 if (old) old_configs.insert(old); | |
| 1056 } | |
| 1057 // now look for old configs with zero ref counts | |
| 1058 for (configp_set::iterator i=old_configs.begin(); i!=old_configs.end(); ) { | |
| 1059 CONFIG *old = *i; | |
| 1060 if (!old->reference_count) { | |
| 1061 delete old; // destructor does all the work | |
| 1062 old_configs.erase(i++); | |
| 1063 } | |
| 1064 else i++; | |
| 1065 } | |
| 1066 } | |
| 18 | 1067 return NULL; |
| 0 | 1068 } |
| 1069 | |
| 1070 | |
| 1071 static void usage(char *prog); | |
| 1072 static void usage(char *prog) | |
| 1073 { | |
| 16 | 1074 fprintf(stderr, "Usage: %s [-d] [-c] -p socket-addr [-t timeout]\n", prog); |
| 0 | 1075 fprintf(stderr, "where socket-addr is for the connection to sendmail and should be one of\n"); |
| 1076 fprintf(stderr, " inet:port@local-ip-address\n"); | |
| 1077 fprintf(stderr, " local:local-domain-socket-file-name\n"); | |
| 9 | 1078 fprintf(stderr, "-c will load and dump the config to stdout\n"); |
| 16 | 1079 fprintf(stderr, "-d will add some syslog debug messages\n"); |
| 0 | 1080 } |
| 1081 | |
| 1082 | |
| 1083 int main(int argc, char**argv) | |
| 1084 { | |
| 3 | 1085 bool check = false; |
| 1086 bool setconn = false; | |
| 0 | 1087 int c; |
| 16 | 1088 const char *args = "p:t:hcd"; |
| 0 | 1089 extern char *optarg; |
| 1090 | |
| 1091 // Process command line options | |
| 1092 while ((c = getopt(argc, argv, args)) != -1) { | |
| 1093 switch (c) { | |
| 1094 case 'p': | |
| 1095 if (optarg == NULL || *optarg == '\0') { | |
| 1096 fprintf(stderr, "Illegal conn: %s\n", optarg); | |
| 1097 exit(EX_USAGE); | |
| 1098 } | |
| 1099 if (smfi_setconn(optarg) == MI_FAILURE) { | |
| 1100 fprintf(stderr, "smfi_setconn failed\n"); | |
| 1101 exit(EX_SOFTWARE); | |
| 1102 } | |
| 1103 | |
| 1104 if (strncasecmp(optarg, "unix:", 5) == 0) unlink(optarg + 5); | |
| 1105 else if (strncasecmp(optarg, "local:", 6) == 0) unlink(optarg + 6); | |
| 3 | 1106 setconn = true; |
| 0 | 1107 break; |
| 1108 | |
| 1109 case 't': | |
| 1110 if (optarg == NULL || *optarg == '\0') { | |
| 1111 fprintf(stderr, "Illegal timeout: %s\n", optarg); | |
| 1112 exit(EX_USAGE); | |
| 1113 } | |
| 1114 if (smfi_settimeout(atoi(optarg)) == MI_FAILURE) { | |
| 1115 fprintf(stderr, "smfi_settimeout failed\n"); | |
| 1116 exit(EX_SOFTWARE); | |
| 1117 } | |
| 1118 break; | |
| 1119 | |
| 3 | 1120 case 'c': |
| 1121 check = true; | |
| 1122 break; | |
| 1123 | |
| 16 | 1124 case 'd': |
| 1125 debug_syslog = true; | |
| 1126 break; | |
| 1127 | |
| 0 | 1128 case 'h': |
| 1129 default: | |
| 1130 usage(argv[0]); | |
| 1131 exit(EX_USAGE); | |
| 1132 } | |
| 1133 } | |
| 5 | 1134 |
| 1135 if (check) { | |
| 1136 CONFIG &dc = *new_conf(); | |
| 1137 dumpit(dc); | |
| 1138 return 0; | |
| 1139 } | |
| 1140 | |
| 0 | 1141 if (!setconn) { |
| 1142 fprintf(stderr, "%s: Missing required -p argument\n", argv[0]); | |
| 1143 usage(argv[0]); | |
| 1144 exit(EX_USAGE); | |
| 1145 } | |
| 5 | 1146 |
| 0 | 1147 if (smfi_register(smfilter) == MI_FAILURE) { |
| 1148 fprintf(stderr, "smfi_register failed\n"); | |
| 1149 exit(EX_UNAVAILABLE); | |
| 1150 } | |
| 1151 | |
| 1152 // switch to background mode | |
| 1153 if (daemon(1,0) < 0) { | |
| 1154 fprintf(stderr, "daemon() call failed\n"); | |
| 1155 exit(EX_UNAVAILABLE); | |
| 1156 } | |
| 1157 | |
| 1158 // initialize the thread sync objects | |
| 1159 pthread_mutex_init(&config_mutex, 0); | |
| 1160 pthread_mutex_init(&syslog_mutex, 0); | |
| 1161 pthread_mutex_init(&resolve_mutex, 0); | |
| 1162 | |
| 1163 // load the initial config | |
| 1164 config = new_conf(); | |
| 1165 | |
| 1166 // only create threads after the fork() in daemon | |
| 1167 pthread_t tid; | |
| 1168 if (pthread_create(&tid, 0, config_loader, 0)) | |
| 1169 my_syslog("failed to create config loader thread"); | |
| 1170 if (pthread_detach(tid)) | |
| 1171 my_syslog("failed to detach config loader thread"); | |
| 1172 | |
| 1173 // write the pid | |
| 1174 const char *pidpath = "/var/run/dnsbl.pid"; | |
| 1175 unlink(pidpath); | |
| 1176 FILE *f = fopen(pidpath, "w"); | |
| 1177 if (f) { | |
| 22 | 1178 #ifdef linux |
| 1179 // from a comment in the DCC source code: | |
| 1180 // Linux threads are broken. Signals given the | |
| 1181 // original process are delivered to only the | |
| 1182 // thread that happens to have that PID. The | |
| 1183 // sendmail libmilter thread that needs to hear | |
| 1184 // SIGINT and other signals does not, and that breaks | |
| 1185 // scripts that need to stop milters. | |
| 1186 // However, signaling the process group works. | |
| 0 | 1187 fprintf(f, "-%d\n", (u_int)getpgrp()); |
| 22 | 1188 #else |
| 1189 fprintf(f, "%d\n", (u_int)getpid()); | |
| 1190 #endif | |
| 0 | 1191 fclose(f); |
| 1192 } | |
| 1193 | |
| 18 | 1194 time_t starting = time(NULL); |
| 1195 int rc = smfi_main(); | |
| 22 | 1196 if ((rc != MI_SUCCESS) && (time(NULL) > starting+5*60)) { |
| 18 | 1197 my_syslog("trying to restart after smfi_main()"); |
| 1198 loader_run = false; // eventually the config loader thread will terminate | |
| 1199 execvp(argv[0], argv); | |
| 1200 } | |
| 1201 exit((rc == MI_SUCCESS) ? 0 : EX_UNAVAILABLE); | |
| 0 | 1202 } |
| 8 | 1203 |