Mercurial > dnsbl
annotate src/dnsbl.cpp @ 26:fdae7ab30cfc
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| author | carl |
|---|---|
| date | Fri, 21 May 2004 21:55:38 -0700 |
| parents | 2e23b7184d2b |
| children | 43a4f6b3e668 |
| 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; |
| 26 | 508 int bin = priv.memory->binary_tags; |
| 24 | 509 int bad = priv.memory->bad_html_tags; |
| 510 int lim = priv.pc->bad_tag_limit; | |
| 26 | 511 if (bin > bad) return oksofar; // probably .zip or .tar.gz with random content |
| 24 | 512 if ((bad > lim) && (lim > 0)) return reject; |
| 9 | 513 return oksofar; |
| 8 | 514 } |
| 515 | |
| 516 | |
| 517 //////////////////////////////////////////////// | |
| 0 | 518 // start of sendmail milter interfaces |
| 519 // | |
| 520 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr) | |
| 521 { | |
| 522 // allocate some private memory | |
| 523 mlfiPriv *priv = new mlfiPriv; | |
| 524 if (hostaddr->sa_family == AF_INET) { | |
| 525 priv->ip = ((struct sockaddr_in *)hostaddr)->sin_addr.s_addr; | |
| 526 } | |
| 527 | |
| 528 // save the private data | |
| 529 smfi_setpriv(ctx, (void*)priv); | |
| 530 | |
| 531 // continue processing | |
| 532 return SMFIS_CONTINUE; | |
| 533 } | |
| 534 | |
| 535 sfsistat mlfi_envfrom(SMFICTX *ctx, char **from) | |
| 536 { | |
| 537 mlfiPriv &priv = *MLFIPRIV; | |
| 538 priv.mailaddr = strdup(from[0]); | |
| 539 priv.authenticated = (smfi_getsymval(ctx, "{auth_authen}") != NULL); | |
| 540 return SMFIS_CONTINUE; | |
| 541 } | |
| 542 | |
| 543 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **rcpt) | |
| 544 { | |
| 545 DNSBLP rejectlist = NULL; // list that caused the reject | |
| 546 status st = oksofar; | |
| 547 mlfiPriv &priv = *MLFIPRIV; | |
| 548 CONFIG &dc = *priv.pc; | |
| 549 char *rcptaddr = rcpt[0]; | |
| 550 char *dnsname = lookup(rcptaddr, dc.env_to_dnsbll); | |
| 551 char *fromname = lookup(rcptaddr, dc.env_to_chkfrom); | |
| 552 if ((strcmp(dnsname, BLACK) == 0) || | |
| 553 (strcmp(fromname, BLACK) == 0)) { | |
| 554 st = black; // two options to blacklist this recipient | |
| 555 } | |
| 556 else if (strcmp(fromname, WHITE) == 0) { | |
| 557 st = white; | |
| 558 } | |
| 559 else { | |
| 560 // check an env_from map | |
| 561 string_map *sm = find_from_map(dc, fromname); | |
| 562 if (sm != NULL) { | |
| 563 fromname = lookup(priv.mailaddr, *sm); // returns default if name not in map | |
| 564 if (strcmp(fromname, BLACK) == 0) { | |
| 565 st = black; // blacklist this envelope from value | |
| 566 } | |
| 567 if (strcmp(fromname, WHITE) == 0) { | |
| 568 st = white; // blacklist this envelope from value | |
| 569 } | |
| 570 } | |
| 571 } | |
| 572 if ((st == oksofar) && (strcmp(dnsname, WHITE) != 0)) { | |
| 573 // check dns lists | |
| 574 st = check_dnsbl(priv, find_dnsbll(dc, dnsname), rejectlist); | |
| 575 } | |
| 576 | |
| 577 if (st == reject) { | |
| 578 // reject the recipient based on some dnsbl | |
| 579 char adr[sizeof "255.255.255.255"]; | |
| 580 adr[0] = '\0'; | |
| 8 | 581 inet_ntop(AF_INET, (const u_char *)&priv.ip, adr, sizeof(adr)); |
| 0 | 582 char buf[2000]; |
| 583 snprintf(buf, sizeof(buf), rejectlist->message, adr, adr); | |
| 584 smfi_setreply(ctx, "550", "5.7.1", buf); | |
| 585 return SMFIS_REJECT; | |
| 586 } | |
| 587 else if (st == black) { | |
| 588 // reject the recipient based on blacklisting either from or to | |
| 589 smfi_setreply(ctx, "550", "5.7.1", "no such user"); | |
| 590 return SMFIS_REJECT; | |
| 591 } | |
| 592 else { | |
| 593 // accept the recipient | |
| 8 | 594 if (st == oksofar) { |
| 595 // but remember the non-whites | |
| 12 | 596 register_string(priv.non_whites, rcptaddr); |
| 8 | 597 priv.only_whites = false; |
| 598 } | |
| 599 if (st == white) { | |
| 600 priv.have_whites = true; | |
| 601 } | |
| 0 | 602 return SMFIS_CONTINUE; |
| 603 } | |
| 604 } | |
| 605 | |
| 8 | 606 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len) |
| 0 | 607 { |
| 608 mlfiPriv &priv = *MLFIPRIV; | |
| 8 | 609 if (priv.authenticated) return SMFIS_CONTINUE; |
| 610 if (priv.only_whites) return SMFIS_CONTINUE; | |
| 611 priv.scanner->scan(data, len); | |
| 11 | 612 return SMFIS_CONTINUE; |
| 8 | 613 } |
| 614 | |
| 615 sfsistat mlfi_eom(SMFICTX *ctx) | |
| 616 { | |
| 617 sfsistat rc; | |
| 618 mlfiPriv &priv = *MLFIPRIV; | |
| 16 | 619 char *host = NULL; |
| 8 | 620 int ip; |
| 621 // process end of message | |
| 622 if (priv.authenticated || | |
| 623 priv.only_whites || | |
| 16 | 624 (check_hosts(priv, host, ip) == oksofar)) rc = SMFIS_CONTINUE; |
| 8 | 625 else { |
| 626 if (!priv.have_whites) { | |
| 627 // can reject the entire message | |
| 628 char buf[2000]; | |
| 24 | 629 if (!host) { |
| 630 // must be rejected due to excessive bad html tags | |
| 631 snprintf(buf, sizeof(buf), priv.pc->limit_message); | |
| 632 } | |
| 633 else { | |
| 634 char adr[sizeof "255.255.255.255"]; | |
| 635 adr[0] = '\0'; | |
| 636 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 637 snprintf(buf, sizeof(buf), priv.pc->content_message, host, adr); | |
| 638 } | |
| 8 | 639 smfi_setreply(ctx, "550", "5.7.1", buf); |
| 640 rc = SMFIS_REJECT; | |
| 641 } | |
| 642 else { | |
| 643 // need to accept it but remove the recipients that don't want it | |
| 644 for (string_set::iterator i=priv.non_whites.begin(); i!=priv.non_whites.end(); i++) { | |
| 645 char *rcpt = *i; | |
| 646 smfi_delrcpt(ctx, rcpt); | |
| 647 } | |
| 648 rc = SMFIS_CONTINUE; | |
| 649 } | |
| 0 | 650 } |
| 8 | 651 // reset for a new message on the same connection |
| 652 mlfi_abort(ctx); | |
| 653 return rc; | |
| 654 } | |
| 655 | |
| 656 sfsistat mlfi_abort(SMFICTX *ctx) | |
| 657 { | |
| 658 mlfiPriv &priv = *MLFIPRIV; | |
| 659 priv.reset(); | |
| 0 | 660 return SMFIS_CONTINUE; |
| 661 } | |
| 662 | |
| 663 sfsistat mlfi_close(SMFICTX *ctx) | |
| 664 { | |
| 665 mlfiPriv *priv = MLFIPRIV; | |
| 666 if (!priv) return SMFIS_CONTINUE; | |
| 667 delete priv; | |
| 668 smfi_setpriv(ctx, NULL); | |
| 669 return SMFIS_CONTINUE; | |
| 670 } | |
| 671 | |
| 672 struct smfiDesc smfilter = | |
| 673 { | |
| 674 "DNSBL", // filter name | |
| 675 SMFI_VERSION, // version code -- do not change | |
| 676 SMFIF_DELRCPT, // flags | |
| 677 mlfi_connect, // connection info filter | |
| 678 NULL, // SMTP HELO command filter | |
| 679 mlfi_envfrom, // envelope sender filter | |
| 680 mlfi_envrcpt, // envelope recipient filter | |
| 681 NULL, // header filter | |
| 682 NULL, // end of header | |
| 8 | 683 mlfi_body, // body block filter |
| 684 mlfi_eom, // end of message | |
| 685 mlfi_abort, // message aborted | |
| 0 | 686 mlfi_close, // connection cleanup |
| 687 }; | |
| 688 | |
| 689 | |
| 690 static void dumpit(char *name, string_map map); | |
| 691 static void dumpit(char *name, string_map map) { | |
| 9 | 692 fprintf(stdout, "\n"); |
| 0 | 693 for (string_map::iterator i=map.begin(); i!=map.end(); i++) { |
| 9 | 694 fprintf(stdout, "%s %s->%s\n", name, (*i).first, (*i).second); |
| 0 | 695 } |
| 696 } | |
| 697 | |
| 698 | |
| 699 static void dumpit(from_map map); | |
| 700 static void dumpit(from_map map) { | |
| 701 for (from_map::iterator i=map.begin(); i!=map.end(); i++) { | |
| 3 | 702 char buf[2000]; |
| 703 snprintf(buf, sizeof(buf), "envelope from map for %s", (*i).first); | |
| 0 | 704 string_map *sm = (*i).second; |
| 3 | 705 dumpit(buf, *sm); |
| 0 | 706 } |
| 707 } | |
| 708 | |
| 709 | |
| 3 | 710 static void dumpit(CONFIG &dc); |
| 711 static void dumpit(CONFIG &dc) { | |
| 5 | 712 dumpit(dc.env_from); |
| 713 dumpit("envelope to (dnsbl list)", dc.env_to_dnsbll); | |
| 714 dumpit("envelope to (from map)", dc.env_to_chkfrom); | |
| 9 | 715 fprintf(stdout, "\ndnsbls\n"); |
| 0 | 716 for (dnsblp_map::iterator i=dc.dnsbls.begin(); i!=dc.dnsbls.end(); i++) { |
| 9 | 717 fprintf(stdout, "%s %s %s\n", (*i).first, (*i).second->suffix, (*i).second->message); |
| 0 | 718 } |
| 9 | 719 fprintf(stdout, "\ndnsbl_lists\n"); |
| 0 | 720 for (dnsbllp_map::iterator i=dc.dnsblls.begin(); i!=dc.dnsblls.end(); i++) { |
| 721 char *name = (*i).first; | |
| 722 DNSBLL &dl = *((*i).second); | |
| 9 | 723 fprintf(stdout, "%s", name); |
| 0 | 724 for (DNSBLL::iterator j=dl.begin(); j!=dl.end(); j++) { |
| 725 DNSBL &d = **j; | |
| 9 | 726 fprintf(stdout, " %s", d.suffix); |
| 0 | 727 } |
| 9 | 728 fprintf(stdout, "\n"); |
| 0 | 729 } |
| 9 | 730 if (dc.content_suffix) { |
| 731 fprintf(stdout, "\ncontent filtering enabled with %s %s\n", dc.content_suffix, dc.content_message); | |
| 732 } | |
| 24 | 733 if (dc.bad_tag_limit) { |
| 734 fprintf(stdout, "\ncontent filtering for excessive html tags enabled with limit %d %s\n", dc.bad_tag_limit, dc.limit_message); | |
| 735 } | |
| 9 | 736 fprintf(stdout, "\nfiles\n"); |
| 3 | 737 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { |
| 738 char *f = *i; | |
| 9 | 739 fprintf(stdout, "config includes %s\n", f); |
| 3 | 740 } |
| 741 } | |
| 742 | |
| 743 | |
| 744 //////////////////////////////////////////////// | |
| 745 // check for redundant or recursive include files | |
| 746 // | |
| 747 static bool ok_to_include(CONFIG &dc, char *fn); | |
| 748 static bool ok_to_include(CONFIG &dc, char *fn) { | |
| 749 if (!fn) return false; | |
| 750 bool ok = true; | |
| 751 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 752 char *f = *i; | |
| 753 if (strcmp(f, fn) == 0) { | |
| 754 my_syslog("redundant or recursive include file detected"); | |
| 755 ok = false; | |
| 756 break; | |
| 757 } | |
| 758 } | |
| 759 return ok; | |
| 0 | 760 } |
| 761 | |
| 762 | |
| 763 //////////////////////////////////////////////// | |
| 764 // load a single config file | |
| 765 // | |
| 3 | 766 static void load_conf_dcc(CONFIG &dc, char *name, char *fn); |
| 767 static void load_conf_dcc(CONFIG &dc, char *name, char *fn) { | |
| 768 dc.config_files.push_back(fn); | |
| 769 char *list = BLACK; | |
| 770 const int LINE_SIZE = 2000; | |
| 771 ifstream is(fn); | |
| 772 if (is.fail()) return; | |
| 773 char line[LINE_SIZE]; | |
| 774 char *delim = " \t"; | |
| 775 int curline = 0; | |
| 776 while (!is.eof()) { | |
| 777 is.getline(line, LINE_SIZE); | |
| 778 curline++; | |
| 779 int n = strlen(line); | |
| 780 if (!n) continue; | |
| 781 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 782 if (line[0] == '#') continue; | |
| 783 char *head = line; | |
| 784 if (strspn(line, delim) == 0) { | |
| 785 // have a leading ok/many tag to fetch | |
| 786 char *cmd = strtok(line, delim); | |
| 787 if (strcmp(cmd, MANY) == 0) list = BLACK; | |
| 788 else if (strcmp(cmd, OK) == 0) list = WHITE; | |
| 789 head = cmd + strlen(cmd) + 1; | |
| 790 } | |
| 791 char *cmd = strtok(head, delim); | |
| 792 if (!cmd) continue; | |
| 793 if (strcmp(cmd, "env_from") == 0) { | |
| 794 char *from = next_token(delim); | |
| 795 if (from) { | |
| 796 string_map &fm = really_find_from_map(dc, name); | |
| 797 fm[from] = list; | |
| 798 } | |
| 799 } | |
| 800 else if (strcmp(cmd, "env_to") == 0) { | |
| 801 char *to = next_token(delim); | |
| 802 if (to) { | |
| 803 dc.env_to_dnsbll[to] = list; | |
| 804 dc.env_to_chkfrom[to] = list; | |
| 805 } | |
| 806 } | |
| 807 else if (strcmp(cmd, "substitute") == 0) { | |
| 808 char *tag = next_token(delim); | |
| 809 if (tag && (strcmp(tag, "mail_host") == 0)) { | |
| 810 char *from = next_token(delim); | |
| 811 if (from) { | |
| 812 string_map &fm = really_find_from_map(dc, name); | |
| 813 fm[from] = list; | |
| 814 } | |
| 815 } | |
| 816 } | |
| 817 else if (strcmp(cmd, "include") == 0) { | |
| 818 char *fn = next_token(delim); | |
| 819 if (ok_to_include(dc, fn)) { | |
| 820 load_conf_dcc(dc, name, fn); | |
| 821 } | |
| 822 } | |
| 823 | |
| 824 } | |
| 825 is.close(); | |
| 826 } | |
| 827 | |
| 828 | |
| 0 | 829 static void load_conf(CONFIG &dc, char *fn); |
| 830 static void load_conf(CONFIG &dc, char *fn) { | |
| 831 dc.config_files.push_back(fn); | |
| 832 map<char*, int, ltstr> commands; | |
| 24 | 833 enum {dummy, content, htmllimit, htmltag, dnsbl, dnsbll, envfrom, envto, include, includedcc}; |
| 8 | 834 commands["content" ] = content; |
| 24 | 835 commands["html_limit" ] = htmllimit; |
| 836 commands["html_tag" ] = htmltag; | |
| 3 | 837 commands["dnsbl" ] = dnsbl; |
| 838 commands["dnsbl_list" ] = dnsbll; | |
| 839 commands["env_from" ] = envfrom; | |
| 840 commands["env_to" ] = envto; | |
| 841 commands["include" ] = include; | |
| 842 commands["include_dcc"] = includedcc; | |
| 0 | 843 const int LINE_SIZE = 2000; |
| 844 ifstream is(fn); | |
| 845 if (is.fail()) return; | |
| 846 char line[LINE_SIZE]; | |
| 847 char orig[LINE_SIZE]; | |
| 848 char *delim = " \t"; | |
| 849 int curline = 0; | |
| 850 while (!is.eof()) { | |
| 851 is.getline(line, LINE_SIZE); | |
| 852 snprintf(orig, sizeof(orig), "%s", line); | |
| 853 curline++; | |
| 854 int n = strlen(line); | |
| 855 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 856 char *cmd = strtok(line, delim); | |
| 857 if (cmd && (cmd[0] != '#') && (cmd[0] != '\0')) { | |
| 858 // have a decent command | |
| 859 bool processed = false; | |
| 860 switch (commands[cmd]) { | |
| 8 | 861 case content: { |
| 862 char *suff = strtok(NULL, delim); | |
| 24 | 863 if (!suff) break; // no dns suffix |
| 8 | 864 char *msg = suff + strlen(suff); |
| 865 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 866 msg = strchr(msg+1, '\''); | |
| 867 if (!msg) break; // no reply message template | |
| 868 msg++; // move over the leading ' | |
| 869 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 870 char *last = strchr(msg, '\''); | |
| 871 if (!last) break; // no trailing quote | |
| 872 *last = '\0'; // make it a null terminator | |
| 873 dc.content_suffix = register_string(suff); | |
| 874 dc.content_message = register_string(msg); | |
| 875 processed = true; | |
| 876 } break; | |
| 877 | |
| 24 | 878 case htmllimit: { |
| 879 char *limit = strtok(NULL, delim); | |
| 880 if (!limit) break; // no integer limit | |
| 881 char *msg = limit + strlen(limit); | |
| 882 if ((msg - line) >= strlen(orig)) break; // line ended with the limit | |
| 883 msg = strchr(msg+1, '\''); | |
| 884 if (!msg) break; // no reply message template | |
| 885 msg++; // move over the leading ' | |
| 886 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 887 char *last = strchr(msg, '\''); | |
| 888 if (!last) break; // no trailing quote | |
| 889 *last = '\0'; // make it a null terminator | |
| 890 dc.bad_tag_limit = atoi(limit); | |
| 891 dc.limit_message = register_string(msg); | |
| 892 processed = true; | |
| 893 } break; | |
| 894 | |
| 895 case htmltag: { | |
| 896 char *tag = next_token(delim); | |
| 897 if (!tag) break; // no html tag value | |
| 26 | 898 char buf[200]; |
| 899 snprintf(buf, sizeof(buf), "/%s", tag); | |
| 24 | 900 dc.html_tags.insert(tag); |
| 26 | 901 dc.html_tags.insert(register_string(buf)); |
| 24 | 902 processed = true; |
| 903 } break; | |
| 904 | |
| 0 | 905 case dnsbl: { |
| 906 // have a new dnsbl to use | |
| 907 char *name = next_token(delim); | |
| 908 if (!name) break; // no name name | |
| 909 if (find_dnsbl(dc, name)) break; // duplicate entry | |
| 910 char *suff = strtok(NULL, delim); | |
| 911 if (!suff) break; // no dns suffic | |
| 912 char *msg = suff + strlen(suff); | |
| 913 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 914 msg = strchr(msg+1, '\''); | |
| 915 if (!msg) break; // no reply message template | |
| 916 msg++; // move over the leading ' | |
| 917 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 918 char *last = strchr(msg, '\''); | |
| 919 if (!last) break; // no trailing quote | |
| 920 *last = '\0'; // make it a null terminator | |
| 921 dc.dnsbls[name] = new DNSBL(register_string(suff), register_string(msg)); | |
| 922 processed = true; | |
| 923 } break; | |
| 924 | |
| 925 case dnsbll: { | |
| 926 // define a new combination of dnsbls | |
| 927 char *name = next_token(delim); | |
| 928 if (!name) break; | |
| 929 if (find_dnsbll(dc, name)) break; // duplicate entry | |
| 930 char *list = next_token(delim); | |
| 931 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 932 DNSBLLP d = new DNSBLL; | |
| 933 DNSBLP p = find_dnsbl(dc, list); | |
| 934 if (p) d->push_back(p); | |
| 935 while (true) { | |
| 936 list = next_token(delim); | |
| 937 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 938 DNSBLP p = find_dnsbl(dc, list); | |
| 939 if (p) d->push_back(p); | |
| 940 } | |
| 941 dc.dnsblls[name] = d; | |
| 942 processed = true; | |
| 943 } break; | |
| 944 | |
| 945 case envfrom: { | |
| 946 // add an entry into the named string_map | |
| 947 char *name = next_token(delim); | |
| 948 if (!name) break; | |
| 949 char *from = next_token(delim); | |
| 950 if (!from) break; | |
| 951 char *list = next_token(delim); | |
| 952 if (!list) break; | |
| 953 if ((strcmp(list, WHITE) == 0) || | |
| 954 (strcmp(list, BLACK) == 0)) { | |
| 955 string_map &fm = really_find_from_map(dc, name); | |
| 956 fm[from] = list; | |
| 957 processed = true; | |
| 958 } | |
| 959 else { | |
| 960 // list may be the name of a previously defined from_map | |
| 961 string_map *m = find_from_map(dc, list); | |
| 962 if (m && (strcmp(list,name) != 0)) { | |
| 963 string_map &pm = *m; | |
| 964 string_map &fm = really_find_from_map(dc, name); | |
| 965 fm.insert(pm.begin(), pm.end()); | |
| 966 processed = true; | |
| 967 } | |
| 968 } | |
| 969 } break; | |
| 970 | |
| 971 case envto: { | |
| 972 // define the dnsbl_list and env_from maps to use for this recipient | |
| 973 char *to = next_token(delim); | |
| 974 if (!to) break; | |
| 975 char *list = next_token(delim); | |
| 976 if (!list) break; | |
| 977 char *from = next_token(delim); | |
| 978 if (!from) break; | |
| 979 dc.env_to_dnsbll[to] = list; | |
| 980 dc.env_to_chkfrom[to] = from; | |
| 981 processed = true; | |
| 982 } break; | |
| 983 | |
| 984 case include: { | |
| 985 char *fn = next_token(delim); | |
| 3 | 986 if (ok_to_include(dc, fn)) { |
| 987 load_conf(dc, fn); | |
| 988 processed = true; | |
| 989 } | |
| 990 } break; | |
| 991 | |
| 992 case includedcc: { | |
| 993 char *name = next_token(delim); | |
| 994 if (!name) break; | |
| 995 char *fn = next_token(delim); | |
| 996 if (ok_to_include(dc, fn)) { | |
| 997 load_conf_dcc(dc, name, fn); | |
| 998 processed = true; | |
| 0 | 999 } |
| 1000 } break; | |
| 1001 | |
| 1002 default: { | |
| 1003 } break; | |
| 1004 } | |
| 1005 if (!processed) { | |
| 1006 pthread_mutex_lock(&syslog_mutex); | |
| 1007 openlog("dnsbl", LOG_PID, LOG_MAIL); | |
| 1008 syslog(LOG_ERR, "ignoring file %s line %d : %s\n", fn, curline, orig); | |
| 1009 closelog(); | |
| 1010 pthread_mutex_unlock(&syslog_mutex); | |
| 1011 } | |
| 1012 } | |
| 1013 } | |
| 1014 is.close(); | |
| 1015 } | |
| 1016 | |
| 1017 | |
| 1018 //////////////////////////////////////////////// | |
| 1019 // reload the config | |
| 1020 // | |
| 1021 static CONFIG* new_conf(); | |
| 1022 static CONFIG* new_conf() { | |
| 1023 my_syslog("loading new configuration"); | |
| 1024 CONFIG *newc = new CONFIG; | |
| 1025 load_conf(*newc, "dnsbl.conf"); | |
| 1026 newc->load_time = time(NULL); | |
| 1027 return newc; | |
| 1028 } | |
| 1029 | |
| 1030 | |
| 1031 //////////////////////////////////////////////// | |
| 1032 // thread to watch the old config files for changes | |
| 1033 // and reload when needed. we also cleanup old | |
| 1034 // configs whose reference count has gone to zero. | |
| 1035 // | |
| 1036 static void* config_loader(void *arg); | |
| 1037 static void* config_loader(void *arg) { | |
| 1038 typedef set<CONFIG *> configp_set; | |
| 1039 configp_set old_configs; | |
| 18 | 1040 while (loader_run) { |
| 0 | 1041 sleep(180); // look for modifications every 3 minutes |
| 18 | 1042 if (!loader_run) break; |
| 0 | 1043 CONFIG &dc = *config; |
| 1044 time_t then = dc.load_time; | |
| 1045 struct stat st; | |
| 1046 bool reload = false; | |
| 1047 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 1048 char *fn = *i; | |
| 1049 if (stat(fn, &st)) reload = true; // file disappeared | |
| 1050 else if (st.st_mtime > then) reload = true; // file modified | |
| 1051 if (reload) break; | |
| 1052 } | |
| 1053 if (reload) { | |
| 1054 CONFIG *newc = new_conf(); | |
| 1055 // replace the global config pointer | |
| 1056 pthread_mutex_lock(&config_mutex); | |
| 1057 CONFIG *old = config; | |
| 1058 config = newc; | |
| 1059 pthread_mutex_unlock(&config_mutex); | |
| 1060 if (old) old_configs.insert(old); | |
| 1061 } | |
| 1062 // now look for old configs with zero ref counts | |
| 1063 for (configp_set::iterator i=old_configs.begin(); i!=old_configs.end(); ) { | |
| 1064 CONFIG *old = *i; | |
| 1065 if (!old->reference_count) { | |
| 1066 delete old; // destructor does all the work | |
| 1067 old_configs.erase(i++); | |
| 1068 } | |
| 1069 else i++; | |
| 1070 } | |
| 1071 } | |
| 18 | 1072 return NULL; |
| 0 | 1073 } |
| 1074 | |
| 1075 | |
| 1076 static void usage(char *prog); | |
| 1077 static void usage(char *prog) | |
| 1078 { | |
| 16 | 1079 fprintf(stderr, "Usage: %s [-d] [-c] -p socket-addr [-t timeout]\n", prog); |
| 0 | 1080 fprintf(stderr, "where socket-addr is for the connection to sendmail and should be one of\n"); |
| 1081 fprintf(stderr, " inet:port@local-ip-address\n"); | |
| 1082 fprintf(stderr, " local:local-domain-socket-file-name\n"); | |
| 9 | 1083 fprintf(stderr, "-c will load and dump the config to stdout\n"); |
| 16 | 1084 fprintf(stderr, "-d will add some syslog debug messages\n"); |
| 0 | 1085 } |
| 1086 | |
| 1087 | |
| 1088 int main(int argc, char**argv) | |
| 1089 { | |
| 3 | 1090 bool check = false; |
| 1091 bool setconn = false; | |
| 0 | 1092 int c; |
| 16 | 1093 const char *args = "p:t:hcd"; |
| 0 | 1094 extern char *optarg; |
| 1095 | |
| 1096 // Process command line options | |
| 1097 while ((c = getopt(argc, argv, args)) != -1) { | |
| 1098 switch (c) { | |
| 1099 case 'p': | |
| 1100 if (optarg == NULL || *optarg == '\0') { | |
| 1101 fprintf(stderr, "Illegal conn: %s\n", optarg); | |
| 1102 exit(EX_USAGE); | |
| 1103 } | |
| 1104 if (smfi_setconn(optarg) == MI_FAILURE) { | |
| 1105 fprintf(stderr, "smfi_setconn failed\n"); | |
| 1106 exit(EX_SOFTWARE); | |
| 1107 } | |
| 1108 | |
| 1109 if (strncasecmp(optarg, "unix:", 5) == 0) unlink(optarg + 5); | |
| 1110 else if (strncasecmp(optarg, "local:", 6) == 0) unlink(optarg + 6); | |
| 3 | 1111 setconn = true; |
| 0 | 1112 break; |
| 1113 | |
| 1114 case 't': | |
| 1115 if (optarg == NULL || *optarg == '\0') { | |
| 1116 fprintf(stderr, "Illegal timeout: %s\n", optarg); | |
| 1117 exit(EX_USAGE); | |
| 1118 } | |
| 1119 if (smfi_settimeout(atoi(optarg)) == MI_FAILURE) { | |
| 1120 fprintf(stderr, "smfi_settimeout failed\n"); | |
| 1121 exit(EX_SOFTWARE); | |
| 1122 } | |
| 1123 break; | |
| 1124 | |
| 3 | 1125 case 'c': |
| 1126 check = true; | |
| 1127 break; | |
| 1128 | |
| 16 | 1129 case 'd': |
| 1130 debug_syslog = true; | |
| 1131 break; | |
| 1132 | |
| 0 | 1133 case 'h': |
| 1134 default: | |
| 1135 usage(argv[0]); | |
| 1136 exit(EX_USAGE); | |
| 1137 } | |
| 1138 } | |
| 5 | 1139 |
| 1140 if (check) { | |
| 1141 CONFIG &dc = *new_conf(); | |
| 1142 dumpit(dc); | |
| 1143 return 0; | |
| 1144 } | |
| 1145 | |
| 0 | 1146 if (!setconn) { |
| 1147 fprintf(stderr, "%s: Missing required -p argument\n", argv[0]); | |
| 1148 usage(argv[0]); | |
| 1149 exit(EX_USAGE); | |
| 1150 } | |
| 5 | 1151 |
| 0 | 1152 if (smfi_register(smfilter) == MI_FAILURE) { |
| 1153 fprintf(stderr, "smfi_register failed\n"); | |
| 1154 exit(EX_UNAVAILABLE); | |
| 1155 } | |
| 1156 | |
| 1157 // switch to background mode | |
| 1158 if (daemon(1,0) < 0) { | |
| 1159 fprintf(stderr, "daemon() call failed\n"); | |
| 1160 exit(EX_UNAVAILABLE); | |
| 1161 } | |
| 1162 | |
| 1163 // initialize the thread sync objects | |
| 1164 pthread_mutex_init(&config_mutex, 0); | |
| 1165 pthread_mutex_init(&syslog_mutex, 0); | |
| 1166 pthread_mutex_init(&resolve_mutex, 0); | |
| 1167 | |
| 1168 // load the initial config | |
| 1169 config = new_conf(); | |
| 1170 | |
| 1171 // only create threads after the fork() in daemon | |
| 1172 pthread_t tid; | |
| 1173 if (pthread_create(&tid, 0, config_loader, 0)) | |
| 1174 my_syslog("failed to create config loader thread"); | |
| 1175 if (pthread_detach(tid)) | |
| 1176 my_syslog("failed to detach config loader thread"); | |
| 1177 | |
| 1178 // write the pid | |
| 1179 const char *pidpath = "/var/run/dnsbl.pid"; | |
| 1180 unlink(pidpath); | |
| 1181 FILE *f = fopen(pidpath, "w"); | |
| 1182 if (f) { | |
| 22 | 1183 #ifdef linux |
| 1184 // from a comment in the DCC source code: | |
| 1185 // Linux threads are broken. Signals given the | |
| 1186 // original process are delivered to only the | |
| 1187 // thread that happens to have that PID. The | |
| 1188 // sendmail libmilter thread that needs to hear | |
| 1189 // SIGINT and other signals does not, and that breaks | |
| 1190 // scripts that need to stop milters. | |
| 1191 // However, signaling the process group works. | |
| 0 | 1192 fprintf(f, "-%d\n", (u_int)getpgrp()); |
| 22 | 1193 #else |
| 1194 fprintf(f, "%d\n", (u_int)getpid()); | |
| 1195 #endif | |
| 0 | 1196 fclose(f); |
| 1197 } | |
| 1198 | |
| 18 | 1199 time_t starting = time(NULL); |
| 1200 int rc = smfi_main(); | |
| 22 | 1201 if ((rc != MI_SUCCESS) && (time(NULL) > starting+5*60)) { |
| 18 | 1202 my_syslog("trying to restart after smfi_main()"); |
| 1203 loader_run = false; // eventually the config loader thread will terminate | |
| 1204 execvp(argv[0], argv); | |
| 1205 } | |
| 1206 exit((rc == MI_SUCCESS) ? 0 : EX_UNAVAILABLE); | |
| 0 | 1207 } |
| 8 | 1208 |