Mercurial > dnsbl
annotate src/dnsbl.cpp @ 29:4dfdf33f1db0 stable-2-4
add syslog msg freeing memory, use bare tld names without leading period
| author | carl |
|---|---|
| date | Thu, 27 May 2004 16:17:48 -0700 |
| parents | 33e1e3910506 |
| children | fc7f8f3ea90f |
| 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 | |
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71 enum status {oksofar, // not rejected yet |
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72 white, // whitelisted by envelope from |
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73 black, // blacklisted by envelope from or to |
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74 reject, // rejected by a dns list |
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75 reject_tag, // too many bad html tags |
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76 reject_host}; // too many hosts/urls in body |
| 1 | 77 |
| 0 | 78 using namespace std; |
| 79 | |
| 80 extern "C" { | |
| 81 #include "libmilter/mfapi.h" | |
| 82 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr); | |
| 83 sfsistat mlfi_envfrom(SMFICTX *ctx, char **argv); | |
| 84 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **argv); | |
| 8 | 85 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len); |
| 86 sfsistat mlfi_eom(SMFICTX *ctx); | |
| 87 sfsistat mlfi_abort(SMFICTX *ctx); | |
| 0 | 88 sfsistat mlfi_close(SMFICTX *ctx); |
| 89 } | |
| 90 | |
| 91 struct ltstr { | |
| 92 bool operator()(char* s1, char* s2) const { | |
| 93 return strcmp(s1, s2) < 0; | |
| 94 } | |
| 95 }; | |
| 96 | |
| 97 struct DNSBL { | |
| 98 char *suffix; // blacklist suffix like blackholes.five-ten-sg.com | |
| 99 char *message; // error message with one or two %s operators for the ip address replacement | |
| 100 DNSBL(char *s, char *m); | |
| 101 }; | |
| 102 DNSBL::DNSBL(char *s, char *m) { | |
| 103 suffix = s; | |
| 104 message = m; | |
| 105 } | |
| 106 | |
| 107 typedef DNSBL * DNSBLP; | |
| 108 typedef list<DNSBLP> DNSBLL; | |
| 109 typedef DNSBLL * DNSBLLP; | |
| 110 typedef map<char *, char *, ltstr> string_map; | |
| 111 typedef map<char *, string_map *, ltstr> from_map; | |
| 112 typedef map<char *, DNSBLP, ltstr> dnsblp_map; | |
| 113 typedef map<char *, DNSBLLP, ltstr> dnsbllp_map; | |
| 114 typedef set<char *, ltstr> string_set; | |
| 115 typedef list<char *> string_list; | |
| 116 | |
| 117 struct CONFIG { | |
| 118 // the only mutable stuff once it has been loaded from the config file | |
| 119 int reference_count; // protected by the global config_mutex | |
| 120 // all the rest is constant after loading from the config file | |
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121 int generation; |
| 0 | 122 time_t load_time; |
| 123 string_list config_files; | |
| 124 dnsblp_map dnsbls; | |
| 125 dnsbllp_map dnsblls; | |
| 126 from_map env_from; | |
| 127 string_map env_to_dnsbll; // map recipient to a named dnsbll | |
| 128 string_map env_to_chkfrom; // map recipient to a named from map | |
| 8 | 129 char * content_suffix; // for sbl url body filtering |
| 9 | 130 char * content_message; // "" |
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131 char * host_limit_message; // error message for excessive host names |
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132 int host_limit; // limit on host names |
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133 char * tag_limit_message; // error message for excessive bad html tags |
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134 int tag_limit; // limit on bad html tags |
| 24 | 135 string_set html_tags; // set of valid html tags |
| 28 | 136 string_set tlds; // set of valid tld components |
| 0 | 137 CONFIG(); |
| 138 ~CONFIG(); | |
| 139 }; | |
| 140 CONFIG::CONFIG() { | |
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141 reference_count = 0; |
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142 generation = 0; |
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143 load_time = 0; |
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144 content_suffix = NULL; |
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145 content_message = NULL; |
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146 host_limit_message = NULL; |
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147 host_limit = 0; |
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148 tag_limit_message = NULL; |
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149 tag_limit = 0; |
| 0 | 150 } |
| 151 CONFIG::~CONFIG() { | |
| 152 for (dnsblp_map::iterator i=dnsbls.begin(); i!=dnsbls.end(); i++) { | |
| 153 DNSBLP d = (*i).second; | |
| 24 | 154 // delete the underlying DNSBL objects. |
| 0 | 155 delete d; |
| 156 } | |
| 157 for (dnsbllp_map::iterator i=dnsblls.begin(); i!=dnsblls.end(); i++) { | |
| 158 DNSBLLP d = (*i).second; | |
| 24 | 159 // *d is a list of pointers to DNSBL objects, but |
| 160 // the underlying objects have already been deleted above. | |
| 0 | 161 delete d; |
| 162 } | |
| 163 for (from_map::iterator i=env_from.begin(); i!=env_from.end(); i++) { | |
| 164 string_map *d = (*i).second; | |
| 165 delete d; | |
| 166 } | |
| 167 } | |
| 168 | |
| 16 | 169 static bool debug_syslog = false; |
| 18 | 170 static bool loader_run = true; // used to stop the config loader thread |
| 0 | 171 static string_set all_strings; // owns all the strings, only modified by the config loader thread |
| 172 static CONFIG * config = NULL; // protected by the config_mutex | |
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173 static int generation = 0; // protected by the config_mutex |
| 0 | 174 |
| 175 static pthread_mutex_t config_mutex; | |
| 176 static pthread_mutex_t syslog_mutex; | |
| 177 static pthread_mutex_t resolve_mutex; | |
| 178 | |
| 179 | |
| 180 //////////////////////////////////////////////// | |
| 8 | 181 // helper to discard the strings held by a string_set |
| 0 | 182 // |
| 9 | 183 static void discard(string_set &s); |
| 184 static void discard(string_set &s) { | |
| 8 | 185 for (string_set::iterator i=s.begin(); i!=s.end(); i++) { |
| 186 free(*i); | |
| 187 } | |
| 9 | 188 s.clear(); |
| 8 | 189 } |
| 0 | 190 |
| 12 | 191 //////////////////////////////////////////////// |
| 192 // helper to register a string in a string set | |
| 193 // | |
| 194 static char* register_string(string_set &s, char *name); | |
| 195 static char* register_string(string_set &s, char *name) { | |
| 196 string_set::iterator i = s.find(name); | |
| 197 if (i != s.end()) return *i; | |
| 198 char *x = strdup(name); | |
| 199 s.insert(x); | |
| 200 return x; | |
| 201 } | |
| 202 | |
| 16 | 203 //////////////////////////////////////////////// |
| 204 // syslog a message | |
| 205 // | |
| 206 static void my_syslog(char *text); | |
| 207 static void my_syslog(char *text) { | |
| 208 pthread_mutex_lock(&syslog_mutex); | |
| 209 openlog("dnsbl", LOG_PID, LOG_MAIL); | |
| 210 syslog(LOG_NOTICE, "%s", text); | |
| 211 closelog(); | |
| 212 pthread_mutex_unlock(&syslog_mutex); | |
| 213 } | |
| 214 | |
| 215 | |
| 12 | 216 // include the content scanner |
| 217 #include "scanner.cpp" | |
| 218 | |
| 219 | |
| 0 | 220 //////////////////////////////////////////////// |
| 221 // mail filter private data, held for us by sendmail | |
| 222 // | |
| 223 struct mlfiPriv | |
| 224 { | |
| 8 | 225 // connection specific data |
| 226 CONFIG *pc; // global context with our maps | |
| 227 int ip; // ip4 address of the smtp client | |
| 228 map<DNSBLP, status> checked; // status from those lists | |
| 229 // message specific data | |
| 0 | 230 char *mailaddr; // envelope from value |
| 231 bool authenticated; // client authenticated? if so, suppress all dnsbl checks | |
| 8 | 232 bool have_whites; // have at least one whitelisted recipient? need to accept content and remove all non-whitelisted recipients if it fails |
| 233 bool only_whites; // every recipient is whitelisted? | |
| 24 | 234 string_set non_whites; // remember the non-whitelisted recipients so we can remove them if need be |
| 235 recorder *memory; // memory for the content scanner | |
| 8 | 236 url_scanner *scanner; // object to handle body scanning |
| 0 | 237 mlfiPriv(); |
| 238 ~mlfiPriv(); | |
| 8 | 239 void reset(bool final = false); // for a new message |
| 0 | 240 }; |
| 241 mlfiPriv::mlfiPriv() { | |
| 242 pthread_mutex_lock(&config_mutex); | |
| 243 pc = config; | |
| 244 pc->reference_count++; | |
| 245 pthread_mutex_unlock(&config_mutex); | |
| 8 | 246 ip = 0; |
| 247 mailaddr = NULL; | |
| 248 authenticated = false; | |
| 249 have_whites = false; | |
| 250 only_whites = true; | |
| 28 | 251 memory = new recorder(&pc->html_tags, &pc->tlds); |
| 24 | 252 scanner = new url_scanner(memory); |
| 0 | 253 } |
| 254 mlfiPriv::~mlfiPriv() { | |
| 255 pthread_mutex_lock(&config_mutex); | |
| 256 pc->reference_count--; | |
| 257 pthread_mutex_unlock(&config_mutex); | |
| 8 | 258 reset(true); |
| 259 } | |
| 260 void mlfiPriv::reset(bool final) { | |
| 0 | 261 if (mailaddr) free(mailaddr); |
| 24 | 262 discard(non_whites); |
| 263 delete memory; | |
| 8 | 264 delete scanner; |
| 265 if (!final) { | |
| 266 mailaddr = NULL; | |
| 267 authenticated = false; | |
| 268 have_whites = false; | |
| 269 only_whites = true; | |
| 28 | 270 memory = new recorder(&pc->html_tags, &pc->tlds); |
| 24 | 271 scanner = new url_scanner(memory); |
| 8 | 272 } |
| 0 | 273 } |
| 274 | |
| 275 #define MLFIPRIV ((struct mlfiPriv *) smfi_getpriv(ctx)) | |
| 276 | |
| 277 | |
| 278 //////////////////////////////////////////////// | |
| 279 // register a global string | |
| 280 // | |
| 281 static char* register_string(char *name); | |
| 282 static char* register_string(char *name) { | |
| 12 | 283 return register_string(all_strings, name); |
| 0 | 284 } |
| 285 | |
| 286 | |
| 287 static char* next_token(char *delim); | |
| 288 static char* next_token(char *delim) { | |
| 289 char *name = strtok(NULL, delim); | |
| 290 if (!name) return name; | |
| 291 return register_string(name); | |
| 292 } | |
| 293 | |
| 294 | |
| 295 //////////////////////////////////////////////// | |
| 296 // lookup an email address in the env_from or env_to maps | |
| 297 // | |
| 298 static char* lookup1(char *email, string_map map); | |
| 299 static char* lookup1(char *email, string_map map) { | |
| 300 string_map::iterator i = map.find(email); | |
| 301 if (i != map.end()) return (*i).second; | |
| 302 char *x = strchr(email, '@'); | |
| 303 if (!x) return DEFAULT; | |
| 304 x++; | |
| 305 i = map.find(x); | |
| 306 if (i != map.end()) return (*i).second; | |
| 307 return DEFAULT; | |
| 308 } | |
| 309 | |
| 310 | |
| 311 //////////////////////////////////////////////// | |
| 312 // lookup an email address in the env_from or env_to maps | |
| 313 // this email address is passed in from sendmail, and will | |
| 314 // always be enclosed in <>. It may have mixed case, just | |
| 315 // as the mail client sent it. | |
| 316 // | |
| 317 static char* lookup(char* email, string_map map); | |
| 318 static char* lookup(char* email, string_map map) { | |
| 319 int n = strlen(email)-2; | |
| 320 if (n < 1) return DEFAULT; // malformed | |
| 321 char *key = strdup(email+1); | |
| 322 key[n] = '\0'; | |
| 323 for (int i=0; i<n; i++) key[i] = tolower(key[i]); | |
| 324 char *rc = lookup1(key, map); | |
| 325 free(key); | |
| 326 return rc; | |
| 327 } | |
| 328 | |
| 329 | |
| 330 //////////////////////////////////////////////// | |
| 331 // find the dnsbl with a specific name | |
| 332 // | |
| 333 static DNSBLP find_dnsbl(CONFIG &dc, char *name); | |
| 334 static DNSBLP find_dnsbl(CONFIG &dc, char *name) { | |
| 335 dnsblp_map::iterator i = dc.dnsbls.find(name); | |
| 336 if (i == dc.dnsbls.end()) return NULL; | |
| 337 return (*i).second; | |
| 338 } | |
| 339 | |
| 340 | |
| 341 //////////////////////////////////////////////// | |
| 342 // find the dnsbll with a specific name | |
| 343 // | |
| 344 static DNSBLLP find_dnsbll(CONFIG &dc, char *name); | |
| 345 static DNSBLLP find_dnsbll(CONFIG &dc, char *name) { | |
| 346 dnsbllp_map::iterator i = dc.dnsblls.find(name); | |
| 347 if (i == dc.dnsblls.end()) return NULL; | |
| 348 return (*i).second; | |
| 349 } | |
| 350 | |
| 351 | |
| 352 //////////////////////////////////////////////// | |
| 353 // find the envfrom map with a specific name | |
| 354 // | |
| 355 static string_map* find_from_map(CONFIG &dc, char *name); | |
| 356 static string_map* find_from_map(CONFIG &dc, char *name) { | |
| 357 from_map::iterator i = dc.env_from.find(name); | |
| 358 if (i == dc.env_from.end()) return NULL; | |
| 359 return (*i).second; | |
| 360 } | |
| 361 | |
| 362 | |
| 363 static string_map& really_find_from_map(CONFIG &dc, char *name); | |
| 364 static string_map& really_find_from_map(CONFIG &dc, char *name) { | |
| 365 string_map *sm = find_from_map(dc, name); | |
| 366 if (!sm) { | |
| 367 sm = new string_map; | |
| 368 dc.env_from[name] = sm; | |
| 369 } | |
| 370 return *sm; | |
| 371 } | |
| 372 | |
| 373 | |
| 374 //////////////////////////////////////////////// | |
| 8 | 375 // |
| 376 // ask a dns question and get an A record answer - we don't try | |
| 377 // very hard, just using the default resolver retry settings. | |
| 378 // If we cannot get an answer, we just accept the mail. The | |
| 379 // caller must ensure thread safety. | |
| 380 // | |
| 0 | 381 // |
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382 static int dns_interface(char *question, bool maybe_ip); |
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383 static int dns_interface(char *question, bool maybe_ip) { |
| 16 | 384 #ifdef NS_PACKETSZ |
| 8 | 385 u_char answer[NS_PACKETSZ]; |
| 386 int length = res_search(question, ns_c_in, ns_t_a, answer, sizeof(answer)); | |
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387 if (length >= 0) { // no error yet |
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388 // parse the answer |
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389 ns_msg handle; |
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390 ns_rr rr; |
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391 if (ns_initparse(answer, length, &handle) == 0) { |
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392 int rrnum = 0; |
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393 while (ns_parserr(&handle, ns_s_an, rrnum++, &rr) == 0) { |
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394 if (ns_rr_type(rr) == ns_t_a) { |
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395 int address; |
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396 memcpy(&address, ns_rr_rdata(rr), sizeof(address)); |
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397 return address; |
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398 } |
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399 } |
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400 } |
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401 } |
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402 if (maybe_ip) { |
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403 // might be a bare ip address |
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404 in_addr ip; |
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405 if (inet_aton(question, &ip)) { |
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406 return ip.s_addr; |
| 8 | 407 } |
| 408 } | |
| 409 return 0; | |
| 16 | 410 #else |
| 411 struct hostent *host = gethostbyname(question); | |
| 412 if (!host) return 0; | |
| 413 if (host->h_addrtype != AF_INET) return 0; | |
| 414 int address; | |
| 415 memcpy(&address, host->h_addr, sizeof(address)); | |
| 416 return address; | |
| 417 #endif | |
| 8 | 418 } |
| 419 | |
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420 static int protected_dns_interface(char *question, bool maybe_ip); |
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421 static int protected_dns_interface(char *question, bool maybe_ip) { |
| 8 | 422 int ans; |
| 423 pthread_mutex_lock(&resolve_mutex); | |
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424 ans = dns_interface(question, maybe_ip); |
| 8 | 425 pthread_mutex_unlock(&resolve_mutex); |
| 426 return ans; | |
| 427 | |
| 428 } | |
| 429 | |
| 430 //////////////////////////////////////////////// | |
| 431 // check a single dnsbl | |
| 432 // | |
| 433 static status check_single(int ip, char *suffix); | |
| 434 static status check_single(int ip, char *suffix) { | |
| 0 | 435 // make a dns question |
| 436 const u_char *src = (const u_char *)&ip; | |
| 437 if (src[0] == 127) return oksofar; // don't do dns lookups on localhost | |
| 16 | 438 #ifdef NS_MAXDNAME |
| 0 | 439 char question[NS_MAXDNAME]; |
| 16 | 440 #else |
| 441 char question[1000]; | |
| 442 #endif | |
| 8 | 443 snprintf(question, sizeof(question), "%u.%u.%u.%u.%s.", src[3], src[2], src[1], src[0], suffix); |
| 444 // ask the question, if we get an A record it implies a blacklisted ip address | |
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445 return (protected_dns_interface(question, false)) ? reject : oksofar; |
| 8 | 446 } |
| 447 | |
| 448 | |
| 449 //////////////////////////////////////////////// | |
| 450 // check a single dnsbl | |
| 451 // | |
| 452 static status check_single(int ip, DNSBL &bl); | |
| 453 static status check_single(int ip, DNSBL &bl) { | |
| 454 return check_single(ip, bl.suffix); | |
| 0 | 455 } |
| 456 | |
| 457 | |
| 458 //////////////////////////////////////////////// | |
| 459 // check the dnsbls specified for this recipient | |
| 460 // | |
| 461 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist); | |
| 462 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist) { | |
| 463 if (priv.authenticated) return oksofar; | |
| 464 if (!dnsbllp) return oksofar; | |
| 465 DNSBLL &dnsbll = *dnsbllp; | |
| 466 for (DNSBLL::iterator i=dnsbll.begin(); i!=dnsbll.end(); i++) { | |
| 467 DNSBLP dp = *i; // non null by construction | |
| 468 status st; | |
| 469 map<DNSBLP, status>::iterator f = priv.checked.find(dp); | |
| 470 if (f == priv.checked.end()) { | |
| 471 // have not checked this list yet | |
| 8 | 472 st = check_single(priv.ip, *dp); |
| 0 | 473 rejectlist = dp; |
| 474 priv.checked[dp] = st; | |
| 475 } | |
| 476 else { | |
| 477 st = (*f).second; | |
| 478 rejectlist = (*f).first; | |
| 479 } | |
| 480 if (st == reject) return st; | |
| 481 } | |
| 482 return oksofar; | |
| 483 } | |
| 484 | |
| 485 | |
| 486 //////////////////////////////////////////////// | |
| 8 | 487 // check the dnsbls specified for this recipient |
| 488 // | |
| 16 | 489 static status check_hosts(mlfiPriv &priv, char *&host, int &ip); |
| 490 static status check_hosts(mlfiPriv &priv, char *&host, int &ip) { | |
| 8 | 491 CONFIG &dc = *priv.pc; |
| 492 if (!dc.content_suffix) return oksofar; | |
| 493 int count = 0; | |
| 24 | 494 for (string_set::iterator i=priv.memory->hosts.begin(); i!=priv.memory->hosts.end(); i++) { |
| 8 | 495 count++; |
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496 int lim = priv.pc->host_limit; |
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497 if ((count > lim) && (lim > 0)) return reject_host; |
| 16 | 498 host = *i; |
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499 ip = protected_dns_interface(host, true); |
| 16 | 500 if (debug_syslog) { |
| 501 char buf[200]; | |
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502 if (ip) { |
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503 char adr[sizeof "255.255.255.255"]; |
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504 adr[0] = '\0'; |
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505 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); |
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506 snprintf(buf, sizeof(buf), "host %s found at %s", host, adr); |
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507 } |
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508 else { |
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509 snprintf(buf, sizeof(buf), "host %s not found", host); |
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510 } |
| 16 | 511 my_syslog(buf); |
| 512 } | |
| 8 | 513 if (ip) { |
| 514 status st = check_single(ip, dc.content_suffix); | |
| 515 if (st == reject) return st; | |
| 516 } | |
| 517 } | |
| 24 | 518 host = NULL; |
| 26 | 519 int bin = priv.memory->binary_tags; |
| 24 | 520 int bad = priv.memory->bad_html_tags; |
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521 int lim = priv.pc->tag_limit; |
| 26 | 522 if (bin > bad) return oksofar; // probably .zip or .tar.gz with random content |
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523 if ((bad > lim) && (lim > 0)) return reject_tag; |
| 9 | 524 return oksofar; |
| 8 | 525 } |
| 526 | |
| 527 | |
| 528 //////////////////////////////////////////////// | |
| 0 | 529 // start of sendmail milter interfaces |
| 530 // | |
| 531 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr) | |
| 532 { | |
| 533 // allocate some private memory | |
| 534 mlfiPriv *priv = new mlfiPriv; | |
| 535 if (hostaddr->sa_family == AF_INET) { | |
| 536 priv->ip = ((struct sockaddr_in *)hostaddr)->sin_addr.s_addr; | |
| 537 } | |
| 538 | |
| 539 // save the private data | |
| 540 smfi_setpriv(ctx, (void*)priv); | |
| 541 | |
| 542 // continue processing | |
| 543 return SMFIS_CONTINUE; | |
| 544 } | |
| 545 | |
| 546 sfsistat mlfi_envfrom(SMFICTX *ctx, char **from) | |
| 547 { | |
| 548 mlfiPriv &priv = *MLFIPRIV; | |
| 549 priv.mailaddr = strdup(from[0]); | |
| 550 priv.authenticated = (smfi_getsymval(ctx, "{auth_authen}") != NULL); | |
| 551 return SMFIS_CONTINUE; | |
| 552 } | |
| 553 | |
| 554 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **rcpt) | |
| 555 { | |
| 556 DNSBLP rejectlist = NULL; // list that caused the reject | |
| 557 status st = oksofar; | |
| 558 mlfiPriv &priv = *MLFIPRIV; | |
| 559 CONFIG &dc = *priv.pc; | |
| 560 char *rcptaddr = rcpt[0]; | |
| 561 char *dnsname = lookup(rcptaddr, dc.env_to_dnsbll); | |
| 562 char *fromname = lookup(rcptaddr, dc.env_to_chkfrom); | |
| 563 if ((strcmp(dnsname, BLACK) == 0) || | |
| 564 (strcmp(fromname, BLACK) == 0)) { | |
| 565 st = black; // two options to blacklist this recipient | |
| 566 } | |
| 567 else if (strcmp(fromname, WHITE) == 0) { | |
| 568 st = white; | |
| 569 } | |
| 570 else { | |
| 571 // check an env_from map | |
| 572 string_map *sm = find_from_map(dc, fromname); | |
| 573 if (sm != NULL) { | |
| 574 fromname = lookup(priv.mailaddr, *sm); // returns default if name not in map | |
| 575 if (strcmp(fromname, BLACK) == 0) { | |
| 576 st = black; // blacklist this envelope from value | |
| 577 } | |
| 578 if (strcmp(fromname, WHITE) == 0) { | |
| 579 st = white; // blacklist this envelope from value | |
| 580 } | |
| 581 } | |
| 582 } | |
| 583 if ((st == oksofar) && (strcmp(dnsname, WHITE) != 0)) { | |
| 584 // check dns lists | |
| 585 st = check_dnsbl(priv, find_dnsbll(dc, dnsname), rejectlist); | |
| 586 } | |
| 587 | |
| 588 if (st == reject) { | |
| 589 // reject the recipient based on some dnsbl | |
| 590 char adr[sizeof "255.255.255.255"]; | |
| 591 adr[0] = '\0'; | |
| 8 | 592 inet_ntop(AF_INET, (const u_char *)&priv.ip, adr, sizeof(adr)); |
| 0 | 593 char buf[2000]; |
| 594 snprintf(buf, sizeof(buf), rejectlist->message, adr, adr); | |
| 595 smfi_setreply(ctx, "550", "5.7.1", buf); | |
| 596 return SMFIS_REJECT; | |
| 597 } | |
| 598 else if (st == black) { | |
| 599 // reject the recipient based on blacklisting either from or to | |
| 600 smfi_setreply(ctx, "550", "5.7.1", "no such user"); | |
| 601 return SMFIS_REJECT; | |
| 602 } | |
| 603 else { | |
| 604 // accept the recipient | |
| 8 | 605 if (st == oksofar) { |
| 606 // but remember the non-whites | |
| 12 | 607 register_string(priv.non_whites, rcptaddr); |
| 8 | 608 priv.only_whites = false; |
| 609 } | |
| 610 if (st == white) { | |
| 611 priv.have_whites = true; | |
| 612 } | |
| 0 | 613 return SMFIS_CONTINUE; |
| 614 } | |
| 615 } | |
| 616 | |
| 8 | 617 sfsistat mlfi_body(SMFICTX *ctx, u_char *data, size_t len) |
| 0 | 618 { |
| 619 mlfiPriv &priv = *MLFIPRIV; | |
| 8 | 620 if (priv.authenticated) return SMFIS_CONTINUE; |
| 621 if (priv.only_whites) return SMFIS_CONTINUE; | |
| 622 priv.scanner->scan(data, len); | |
| 11 | 623 return SMFIS_CONTINUE; |
| 8 | 624 } |
| 625 | |
| 626 sfsistat mlfi_eom(SMFICTX *ctx) | |
| 627 { | |
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628 sfsistat rc; |
| 8 | 629 mlfiPriv &priv = *MLFIPRIV; |
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630 char *host = NULL; |
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631 int ip; |
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632 status st; |
| 8 | 633 // process end of message |
| 634 if (priv.authenticated || | |
| 635 priv.only_whites || | |
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636 ((st=check_hosts(priv, host, ip)) == oksofar)) rc = SMFIS_CONTINUE; |
| 8 | 637 else { |
| 638 if (!priv.have_whites) { | |
| 639 // can reject the entire message | |
| 640 char buf[2000]; | |
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641 if (st == reject_tag) { |
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642 // rejected due to excessive bad html tags |
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643 snprintf(buf, sizeof(buf), priv.pc->tag_limit_message); |
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644 } |
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645 else if (st == reject_host) { |
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646 // rejected due to excessive unique host/urls |
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647 snprintf(buf, sizeof(buf), priv.pc->host_limit_message); |
| 24 | 648 } |
| 649 else { | |
| 650 char adr[sizeof "255.255.255.255"]; | |
| 651 adr[0] = '\0'; | |
| 652 inet_ntop(AF_INET, (const u_char *)&ip, adr, sizeof(adr)); | |
| 653 snprintf(buf, sizeof(buf), priv.pc->content_message, host, adr); | |
| 654 } | |
| 8 | 655 smfi_setreply(ctx, "550", "5.7.1", buf); |
| 656 rc = SMFIS_REJECT; | |
| 657 } | |
| 658 else { | |
| 659 // need to accept it but remove the recipients that don't want it | |
| 660 for (string_set::iterator i=priv.non_whites.begin(); i!=priv.non_whites.end(); i++) { | |
| 661 char *rcpt = *i; | |
| 662 smfi_delrcpt(ctx, rcpt); | |
| 663 } | |
| 664 rc = SMFIS_CONTINUE; | |
| 665 } | |
| 0 | 666 } |
| 8 | 667 // reset for a new message on the same connection |
| 668 mlfi_abort(ctx); | |
| 669 return rc; | |
| 670 } | |
| 671 | |
| 672 sfsistat mlfi_abort(SMFICTX *ctx) | |
| 673 { | |
| 674 mlfiPriv &priv = *MLFIPRIV; | |
| 675 priv.reset(); | |
| 0 | 676 return SMFIS_CONTINUE; |
| 677 } | |
| 678 | |
| 679 sfsistat mlfi_close(SMFICTX *ctx) | |
| 680 { | |
| 681 mlfiPriv *priv = MLFIPRIV; | |
| 682 if (!priv) return SMFIS_CONTINUE; | |
| 683 delete priv; | |
| 684 smfi_setpriv(ctx, NULL); | |
| 685 return SMFIS_CONTINUE; | |
| 686 } | |
| 687 | |
| 688 struct smfiDesc smfilter = | |
| 689 { | |
| 690 "DNSBL", // filter name | |
| 691 SMFI_VERSION, // version code -- do not change | |
| 692 SMFIF_DELRCPT, // flags | |
| 693 mlfi_connect, // connection info filter | |
| 694 NULL, // SMTP HELO command filter | |
| 695 mlfi_envfrom, // envelope sender filter | |
| 696 mlfi_envrcpt, // envelope recipient filter | |
| 697 NULL, // header filter | |
| 698 NULL, // end of header | |
| 8 | 699 mlfi_body, // body block filter |
| 700 mlfi_eom, // end of message | |
| 701 mlfi_abort, // message aborted | |
| 0 | 702 mlfi_close, // connection cleanup |
| 703 }; | |
| 704 | |
| 705 | |
| 706 static void dumpit(char *name, string_map map); | |
| 707 static void dumpit(char *name, string_map map) { | |
| 9 | 708 fprintf(stdout, "\n"); |
| 0 | 709 for (string_map::iterator i=map.begin(); i!=map.end(); i++) { |
| 9 | 710 fprintf(stdout, "%s %s->%s\n", name, (*i).first, (*i).second); |
| 0 | 711 } |
| 712 } | |
| 713 | |
| 714 | |
| 715 static void dumpit(from_map map); | |
| 716 static void dumpit(from_map map) { | |
| 717 for (from_map::iterator i=map.begin(); i!=map.end(); i++) { | |
| 3 | 718 char buf[2000]; |
| 719 snprintf(buf, sizeof(buf), "envelope from map for %s", (*i).first); | |
| 0 | 720 string_map *sm = (*i).second; |
| 3 | 721 dumpit(buf, *sm); |
| 0 | 722 } |
| 723 } | |
| 724 | |
| 725 | |
| 3 | 726 static void dumpit(CONFIG &dc); |
| 727 static void dumpit(CONFIG &dc) { | |
| 5 | 728 dumpit(dc.env_from); |
| 729 dumpit("envelope to (dnsbl list)", dc.env_to_dnsbll); | |
| 730 dumpit("envelope to (from map)", dc.env_to_chkfrom); | |
| 9 | 731 fprintf(stdout, "\ndnsbls\n"); |
| 0 | 732 for (dnsblp_map::iterator i=dc.dnsbls.begin(); i!=dc.dnsbls.end(); i++) { |
| 9 | 733 fprintf(stdout, "%s %s %s\n", (*i).first, (*i).second->suffix, (*i).second->message); |
| 0 | 734 } |
| 9 | 735 fprintf(stdout, "\ndnsbl_lists\n"); |
| 0 | 736 for (dnsbllp_map::iterator i=dc.dnsblls.begin(); i!=dc.dnsblls.end(); i++) { |
| 737 char *name = (*i).first; | |
| 738 DNSBLL &dl = *((*i).second); | |
| 9 | 739 fprintf(stdout, "%s", name); |
| 0 | 740 for (DNSBLL::iterator j=dl.begin(); j!=dl.end(); j++) { |
| 741 DNSBL &d = **j; | |
| 9 | 742 fprintf(stdout, " %s", d.suffix); |
| 0 | 743 } |
| 9 | 744 fprintf(stdout, "\n"); |
| 0 | 745 } |
| 9 | 746 if (dc.content_suffix) { |
| 747 fprintf(stdout, "\ncontent filtering enabled with %s %s\n", dc.content_suffix, dc.content_message); | |
| 748 } | |
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749 if (dc.host_limit) { |
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750 fprintf(stdout, "\ncontent filtering for host names enabled with limit %d %s\n", dc.host_limit, dc.host_limit_message); |
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751 } |
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752 if (dc.tag_limit) { |
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753 fprintf(stdout, "\ncontent filtering for excessive html tags enabled with limit %d %s\n", dc.tag_limit, dc.tag_limit_message); |
| 24 | 754 } |
| 9 | 755 fprintf(stdout, "\nfiles\n"); |
| 3 | 756 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { |
| 757 char *f = *i; | |
| 9 | 758 fprintf(stdout, "config includes %s\n", f); |
| 3 | 759 } |
| 760 } | |
| 761 | |
| 762 | |
| 763 //////////////////////////////////////////////// | |
| 764 // check for redundant or recursive include files | |
| 765 // | |
| 766 static bool ok_to_include(CONFIG &dc, char *fn); | |
| 767 static bool ok_to_include(CONFIG &dc, char *fn) { | |
| 768 if (!fn) return false; | |
| 769 bool ok = true; | |
| 770 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 771 char *f = *i; | |
| 772 if (strcmp(f, fn) == 0) { | |
| 773 my_syslog("redundant or recursive include file detected"); | |
| 774 ok = false; | |
| 775 break; | |
| 776 } | |
| 777 } | |
| 778 return ok; | |
| 0 | 779 } |
| 780 | |
| 781 | |
| 782 //////////////////////////////////////////////// | |
| 783 // load a single config file | |
| 784 // | |
| 3 | 785 static void load_conf_dcc(CONFIG &dc, char *name, char *fn); |
| 786 static void load_conf_dcc(CONFIG &dc, char *name, char *fn) { | |
| 787 dc.config_files.push_back(fn); | |
| 788 char *list = BLACK; | |
| 789 const int LINE_SIZE = 2000; | |
| 790 ifstream is(fn); | |
| 791 if (is.fail()) return; | |
| 792 char line[LINE_SIZE]; | |
| 793 char *delim = " \t"; | |
| 794 int curline = 0; | |
| 795 while (!is.eof()) { | |
| 796 is.getline(line, LINE_SIZE); | |
| 797 curline++; | |
| 798 int n = strlen(line); | |
| 799 if (!n) continue; | |
| 800 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 801 if (line[0] == '#') continue; | |
| 802 char *head = line; | |
| 803 if (strspn(line, delim) == 0) { | |
| 804 // have a leading ok/many tag to fetch | |
| 805 char *cmd = strtok(line, delim); | |
| 806 if (strcmp(cmd, MANY) == 0) list = BLACK; | |
| 807 else if (strcmp(cmd, OK) == 0) list = WHITE; | |
| 808 head = cmd + strlen(cmd) + 1; | |
| 809 } | |
| 810 char *cmd = strtok(head, delim); | |
| 811 if (!cmd) continue; | |
| 812 if (strcmp(cmd, "env_from") == 0) { | |
| 813 char *from = next_token(delim); | |
| 814 if (from) { | |
| 815 string_map &fm = really_find_from_map(dc, name); | |
| 816 fm[from] = list; | |
| 817 } | |
| 818 } | |
| 819 else if (strcmp(cmd, "env_to") == 0) { | |
| 820 char *to = next_token(delim); | |
| 821 if (to) { | |
| 822 dc.env_to_dnsbll[to] = list; | |
| 823 dc.env_to_chkfrom[to] = list; | |
| 824 } | |
| 825 } | |
| 826 else if (strcmp(cmd, "substitute") == 0) { | |
| 827 char *tag = next_token(delim); | |
| 828 if (tag && (strcmp(tag, "mail_host") == 0)) { | |
| 829 char *from = next_token(delim); | |
| 830 if (from) { | |
| 831 string_map &fm = really_find_from_map(dc, name); | |
| 832 fm[from] = list; | |
| 833 } | |
| 834 } | |
| 835 } | |
| 836 else if (strcmp(cmd, "include") == 0) { | |
| 837 char *fn = next_token(delim); | |
| 838 if (ok_to_include(dc, fn)) { | |
| 839 load_conf_dcc(dc, name, fn); | |
| 840 } | |
| 841 } | |
| 842 | |
| 843 } | |
| 844 is.close(); | |
| 845 } | |
| 846 | |
| 847 | |
| 0 | 848 static void load_conf(CONFIG &dc, char *fn); |
| 849 static void load_conf(CONFIG &dc, char *fn) { | |
| 850 dc.config_files.push_back(fn); | |
| 851 map<char*, int, ltstr> commands; | |
| 28 | 852 enum {dummy, tld, content, hostlimit, htmllimit, htmltag, dnsbl, dnsbll, envfrom, envto, include, includedcc}; |
| 853 commands["tld" ] = tld; | |
| 8 | 854 commands["content" ] = content; |
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855 commands["host_limit" ] = hostlimit; |
| 24 | 856 commands["html_limit" ] = htmllimit; |
| 857 commands["html_tag" ] = htmltag; | |
| 3 | 858 commands["dnsbl" ] = dnsbl; |
| 859 commands["dnsbl_list" ] = dnsbll; | |
| 860 commands["env_from" ] = envfrom; | |
| 861 commands["env_to" ] = envto; | |
| 862 commands["include" ] = include; | |
| 863 commands["include_dcc"] = includedcc; | |
| 0 | 864 const int LINE_SIZE = 2000; |
| 865 ifstream is(fn); | |
| 866 if (is.fail()) return; | |
| 867 char line[LINE_SIZE]; | |
| 868 char orig[LINE_SIZE]; | |
| 869 char *delim = " \t"; | |
| 870 int curline = 0; | |
| 871 while (!is.eof()) { | |
| 872 is.getline(line, LINE_SIZE); | |
| 873 snprintf(orig, sizeof(orig), "%s", line); | |
| 874 curline++; | |
| 875 int n = strlen(line); | |
| 876 for (int i=0; i<n; i++) line[i] = tolower(line[i]); | |
| 877 char *cmd = strtok(line, delim); | |
| 878 if (cmd && (cmd[0] != '#') && (cmd[0] != '\0')) { | |
| 879 // have a decent command | |
| 880 bool processed = false; | |
| 881 switch (commands[cmd]) { | |
| 28 | 882 case tld: { |
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883 char *tld = next_token(delim); |
| 28 | 884 if (!tld) break; // no tld value |
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885 dc.tlds.insert(tld); |
| 28 | 886 processed = true; |
| 887 } break; | |
| 888 | |
| 8 | 889 case content: { |
| 890 char *suff = strtok(NULL, delim); | |
| 24 | 891 if (!suff) break; // no dns suffix |
| 8 | 892 char *msg = suff + strlen(suff); |
| 893 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 894 msg = strchr(msg+1, '\''); | |
| 895 if (!msg) break; // no reply message template | |
| 896 msg++; // move over the leading ' | |
| 897 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 898 char *last = strchr(msg, '\''); | |
| 899 if (!last) break; // no trailing quote | |
| 900 *last = '\0'; // make it a null terminator | |
| 901 dc.content_suffix = register_string(suff); | |
| 902 dc.content_message = register_string(msg); | |
| 903 processed = true; | |
| 904 } break; | |
| 905 | |
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906 case hostlimit: { |
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907 char *limit = strtok(NULL, delim); |
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908 if (!limit) break; // no integer limit |
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909 char *msg = limit + strlen(limit); |
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910 if ((msg - line) >= strlen(orig)) break; // line ended with the limit |
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911 msg = strchr(msg+1, '\''); |
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912 if (!msg) break; // no reply message template |
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913 msg++; // move over the leading ' |
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914 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote |
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915 char *last = strchr(msg, '\''); |
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916 if (!last) break; // no trailing quote |
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917 *last = '\0'; // make it a null terminator |
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918 dc.host_limit = atoi(limit); |
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919 dc.host_limit_message = register_string(msg); |
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920 processed = true; |
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921 } break; |
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922 |
| 24 | 923 case htmllimit: { |
| 924 char *limit = strtok(NULL, delim); | |
| 925 if (!limit) break; // no integer limit | |
| 926 char *msg = limit + strlen(limit); | |
| 927 if ((msg - line) >= strlen(orig)) break; // line ended with the limit | |
| 928 msg = strchr(msg+1, '\''); | |
| 929 if (!msg) break; // no reply message template | |
| 930 msg++; // move over the leading ' | |
| 931 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 932 char *last = strchr(msg, '\''); | |
| 933 if (!last) break; // no trailing quote | |
| 934 *last = '\0'; // make it a null terminator | |
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935 dc.tag_limit = atoi(limit); |
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936 dc.tag_limit_message = register_string(msg); |
| 24 | 937 processed = true; |
| 938 } break; | |
| 939 | |
| 940 case htmltag: { | |
| 941 char *tag = next_token(delim); | |
| 942 if (!tag) break; // no html tag value | |
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943 dc.html_tags.insert(tag); // base version |
| 26 | 944 char buf[200]; |
| 945 snprintf(buf, sizeof(buf), "/%s", tag); | |
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946 dc.html_tags.insert(register_string(buf)); // leading / |
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947 snprintf(buf, sizeof(buf), "%s/", tag); |
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948 dc.html_tags.insert(register_string(buf)); // trailing / |
| 24 | 949 processed = true; |
| 950 } break; | |
| 951 | |
| 0 | 952 case dnsbl: { |
| 953 // have a new dnsbl to use | |
| 954 char *name = next_token(delim); | |
| 955 if (!name) break; // no name name | |
| 956 if (find_dnsbl(dc, name)) break; // duplicate entry | |
| 957 char *suff = strtok(NULL, delim); | |
| 958 if (!suff) break; // no dns suffic | |
| 959 char *msg = suff + strlen(suff); | |
| 960 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix | |
| 961 msg = strchr(msg+1, '\''); | |
| 962 if (!msg) break; // no reply message template | |
| 963 msg++; // move over the leading ' | |
| 964 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote | |
| 965 char *last = strchr(msg, '\''); | |
| 966 if (!last) break; // no trailing quote | |
| 967 *last = '\0'; // make it a null terminator | |
| 968 dc.dnsbls[name] = new DNSBL(register_string(suff), register_string(msg)); | |
| 969 processed = true; | |
| 970 } break; | |
| 971 | |
| 972 case dnsbll: { | |
| 973 // define a new combination of dnsbls | |
| 974 char *name = next_token(delim); | |
| 975 if (!name) break; | |
| 976 if (find_dnsbll(dc, name)) break; // duplicate entry | |
| 977 char *list = next_token(delim); | |
| 978 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 979 DNSBLLP d = new DNSBLL; | |
| 980 DNSBLP p = find_dnsbl(dc, list); | |
| 981 if (p) d->push_back(p); | |
| 982 while (true) { | |
| 983 list = next_token(delim); | |
| 984 if (!list || (*list == '\0') || (*list == '#')) break; | |
| 985 DNSBLP p = find_dnsbl(dc, list); | |
| 986 if (p) d->push_back(p); | |
| 987 } | |
| 988 dc.dnsblls[name] = d; | |
| 989 processed = true; | |
| 990 } break; | |
| 991 | |
| 992 case envfrom: { | |
| 993 // add an entry into the named string_map | |
| 994 char *name = next_token(delim); | |
| 995 if (!name) break; | |
| 996 char *from = next_token(delim); | |
| 997 if (!from) break; | |
| 998 char *list = next_token(delim); | |
| 999 if (!list) break; | |
| 1000 if ((strcmp(list, WHITE) == 0) || | |
| 1001 (strcmp(list, BLACK) == 0)) { | |
| 1002 string_map &fm = really_find_from_map(dc, name); | |
| 1003 fm[from] = list; | |
| 1004 processed = true; | |
| 1005 } | |
| 1006 else { | |
| 1007 // list may be the name of a previously defined from_map | |
| 1008 string_map *m = find_from_map(dc, list); | |
| 1009 if (m && (strcmp(list,name) != 0)) { | |
| 1010 string_map &pm = *m; | |
| 1011 string_map &fm = really_find_from_map(dc, name); | |
| 1012 fm.insert(pm.begin(), pm.end()); | |
| 1013 processed = true; | |
| 1014 } | |
| 1015 } | |
| 1016 } break; | |
| 1017 | |
| 1018 case envto: { | |
| 1019 // define the dnsbl_list and env_from maps to use for this recipient | |
| 1020 char *to = next_token(delim); | |
| 1021 if (!to) break; | |
| 1022 char *list = next_token(delim); | |
| 1023 if (!list) break; | |
| 1024 char *from = next_token(delim); | |
| 1025 if (!from) break; | |
| 1026 dc.env_to_dnsbll[to] = list; | |
| 1027 dc.env_to_chkfrom[to] = from; | |
| 1028 processed = true; | |
| 1029 } break; | |
| 1030 | |
| 1031 case include: { | |
| 1032 char *fn = next_token(delim); | |
| 3 | 1033 if (ok_to_include(dc, fn)) { |
| 1034 load_conf(dc, fn); | |
| 1035 processed = true; | |
| 1036 } | |
| 1037 } break; | |
| 1038 | |
| 1039 case includedcc: { | |
| 1040 char *name = next_token(delim); | |
| 1041 if (!name) break; | |
| 1042 char *fn = next_token(delim); | |
| 1043 if (ok_to_include(dc, fn)) { | |
| 1044 load_conf_dcc(dc, name, fn); | |
| 1045 processed = true; | |
| 0 | 1046 } |
| 1047 } break; | |
| 1048 | |
| 1049 default: { | |
| 1050 } break; | |
| 1051 } | |
| 1052 if (!processed) { | |
| 1053 pthread_mutex_lock(&syslog_mutex); | |
| 1054 openlog("dnsbl", LOG_PID, LOG_MAIL); | |
| 1055 syslog(LOG_ERR, "ignoring file %s line %d : %s\n", fn, curline, orig); | |
| 1056 closelog(); | |
| 1057 pthread_mutex_unlock(&syslog_mutex); | |
| 1058 } | |
| 1059 } | |
| 1060 } | |
| 1061 is.close(); | |
| 1062 } | |
| 1063 | |
| 1064 | |
| 1065 //////////////////////////////////////////////// | |
| 1066 // reload the config | |
| 1067 // | |
| 1068 static CONFIG* new_conf(); | |
| 1069 static CONFIG* new_conf() { | |
| 1070 CONFIG *newc = new CONFIG; | |
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1071 pthread_mutex_lock(&config_mutex); |
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1072 newc->generation = generation++; |
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1073 pthread_mutex_unlock(&config_mutex); |
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1074 char buf[200]; |
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1075 snprintf(buf, sizeof(buf), "loading configuration generation %d", newc->generation); |
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1076 my_syslog(buf); |
| 0 | 1077 load_conf(*newc, "dnsbl.conf"); |
| 1078 newc->load_time = time(NULL); | |
| 1079 return newc; | |
| 1080 } | |
| 1081 | |
| 1082 | |
| 1083 //////////////////////////////////////////////// | |
| 1084 // thread to watch the old config files for changes | |
| 1085 // and reload when needed. we also cleanup old | |
| 1086 // configs whose reference count has gone to zero. | |
| 1087 // | |
| 1088 static void* config_loader(void *arg); | |
| 1089 static void* config_loader(void *arg) { | |
| 1090 typedef set<CONFIG *> configp_set; | |
| 1091 configp_set old_configs; | |
| 18 | 1092 while (loader_run) { |
| 0 | 1093 sleep(180); // look for modifications every 3 minutes |
| 18 | 1094 if (!loader_run) break; |
| 0 | 1095 CONFIG &dc = *config; |
| 1096 time_t then = dc.load_time; | |
| 1097 struct stat st; | |
| 1098 bool reload = false; | |
| 1099 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) { | |
| 1100 char *fn = *i; | |
| 1101 if (stat(fn, &st)) reload = true; // file disappeared | |
| 1102 else if (st.st_mtime > then) reload = true; // file modified | |
| 1103 if (reload) break; | |
| 1104 } | |
| 1105 if (reload) { | |
| 1106 CONFIG *newc = new_conf(); | |
| 1107 // replace the global config pointer | |
| 1108 pthread_mutex_lock(&config_mutex); | |
| 1109 CONFIG *old = config; | |
| 1110 config = newc; | |
| 1111 pthread_mutex_unlock(&config_mutex); | |
| 1112 if (old) old_configs.insert(old); | |
| 1113 } | |
| 1114 // now look for old configs with zero ref counts | |
| 1115 for (configp_set::iterator i=old_configs.begin(); i!=old_configs.end(); ) { | |
| 1116 CONFIG *old = *i; | |
| 1117 if (!old->reference_count) { | |
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1118 char buf[200]; |
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1119 snprintf(buf, sizeof(buf), "freeing memory for old configuration generation %d", old->generation); |
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1120 my_syslog(buf); |
| 0 | 1121 delete old; // destructor does all the work |
| 1122 old_configs.erase(i++); | |
| 1123 } | |
| 1124 else i++; | |
| 1125 } | |
| 1126 } | |
| 18 | 1127 return NULL; |
| 0 | 1128 } |
| 1129 | |
| 1130 | |
| 1131 static void usage(char *prog); | |
| 1132 static void usage(char *prog) | |
| 1133 { | |
| 16 | 1134 fprintf(stderr, "Usage: %s [-d] [-c] -p socket-addr [-t timeout]\n", prog); |
| 0 | 1135 fprintf(stderr, "where socket-addr is for the connection to sendmail and should be one of\n"); |
| 1136 fprintf(stderr, " inet:port@local-ip-address\n"); | |
| 1137 fprintf(stderr, " local:local-domain-socket-file-name\n"); | |
| 9 | 1138 fprintf(stderr, "-c will load and dump the config to stdout\n"); |
| 16 | 1139 fprintf(stderr, "-d will add some syslog debug messages\n"); |
| 0 | 1140 } |
| 1141 | |
| 1142 | |
| 1143 int main(int argc, char**argv) | |
| 1144 { | |
| 3 | 1145 bool check = false; |
| 1146 bool setconn = false; | |
| 0 | 1147 int c; |
| 16 | 1148 const char *args = "p:t:hcd"; |
| 0 | 1149 extern char *optarg; |
| 1150 | |
| 1151 // Process command line options | |
| 1152 while ((c = getopt(argc, argv, args)) != -1) { | |
| 1153 switch (c) { | |
| 1154 case 'p': | |
| 1155 if (optarg == NULL || *optarg == '\0') { | |
| 1156 fprintf(stderr, "Illegal conn: %s\n", optarg); | |
| 1157 exit(EX_USAGE); | |
| 1158 } | |
| 1159 if (smfi_setconn(optarg) == MI_FAILURE) { | |
| 1160 fprintf(stderr, "smfi_setconn failed\n"); | |
| 1161 exit(EX_SOFTWARE); | |
| 1162 } | |
| 1163 | |
| 1164 if (strncasecmp(optarg, "unix:", 5) == 0) unlink(optarg + 5); | |
| 1165 else if (strncasecmp(optarg, "local:", 6) == 0) unlink(optarg + 6); | |
| 3 | 1166 setconn = true; |
| 0 | 1167 break; |
| 1168 | |
| 1169 case 't': | |
| 1170 if (optarg == NULL || *optarg == '\0') { | |
| 1171 fprintf(stderr, "Illegal timeout: %s\n", optarg); | |
| 1172 exit(EX_USAGE); | |
| 1173 } | |
| 1174 if (smfi_settimeout(atoi(optarg)) == MI_FAILURE) { | |
| 1175 fprintf(stderr, "smfi_settimeout failed\n"); | |
| 1176 exit(EX_SOFTWARE); | |
| 1177 } | |
| 1178 break; | |
| 1179 | |
| 3 | 1180 case 'c': |
| 1181 check = true; | |
| 1182 break; | |
| 1183 | |
| 16 | 1184 case 'd': |
| 1185 debug_syslog = true; | |
| 1186 break; | |
| 1187 | |
| 0 | 1188 case 'h': |
| 1189 default: | |
| 1190 usage(argv[0]); | |
| 1191 exit(EX_USAGE); | |
| 1192 } | |
| 1193 } | |
| 5 | 1194 |
| 1195 if (check) { | |
| 1196 CONFIG &dc = *new_conf(); | |
| 1197 dumpit(dc); | |
| 1198 return 0; | |
| 1199 } | |
| 1200 | |
| 0 | 1201 if (!setconn) { |
| 1202 fprintf(stderr, "%s: Missing required -p argument\n", argv[0]); | |
| 1203 usage(argv[0]); | |
| 1204 exit(EX_USAGE); | |
| 1205 } | |
| 5 | 1206 |
| 0 | 1207 if (smfi_register(smfilter) == MI_FAILURE) { |
| 1208 fprintf(stderr, "smfi_register failed\n"); | |
| 1209 exit(EX_UNAVAILABLE); | |
| 1210 } | |
| 1211 | |
| 1212 // switch to background mode | |
| 1213 if (daemon(1,0) < 0) { | |
| 1214 fprintf(stderr, "daemon() call failed\n"); | |
| 1215 exit(EX_UNAVAILABLE); | |
| 1216 } | |
| 1217 | |
| 1218 // initialize the thread sync objects | |
| 1219 pthread_mutex_init(&config_mutex, 0); | |
| 1220 pthread_mutex_init(&syslog_mutex, 0); | |
| 1221 pthread_mutex_init(&resolve_mutex, 0); | |
| 1222 | |
| 1223 // load the initial config | |
| 1224 config = new_conf(); | |
| 1225 | |
| 1226 // only create threads after the fork() in daemon | |
| 1227 pthread_t tid; | |
| 1228 if (pthread_create(&tid, 0, config_loader, 0)) | |
| 1229 my_syslog("failed to create config loader thread"); | |
| 1230 if (pthread_detach(tid)) | |
| 1231 my_syslog("failed to detach config loader thread"); | |
| 1232 | |
| 1233 // write the pid | |
| 1234 const char *pidpath = "/var/run/dnsbl.pid"; | |
| 1235 unlink(pidpath); | |
| 1236 FILE *f = fopen(pidpath, "w"); | |
| 1237 if (f) { | |
| 22 | 1238 #ifdef linux |
| 1239 // from a comment in the DCC source code: | |
| 1240 // Linux threads are broken. Signals given the | |
| 1241 // original process are delivered to only the | |
| 1242 // thread that happens to have that PID. The | |
| 1243 // sendmail libmilter thread that needs to hear | |
| 1244 // SIGINT and other signals does not, and that breaks | |
| 1245 // scripts that need to stop milters. | |
| 1246 // However, signaling the process group works. | |
| 0 | 1247 fprintf(f, "-%d\n", (u_int)getpgrp()); |
| 22 | 1248 #else |
| 1249 fprintf(f, "%d\n", (u_int)getpid()); | |
| 1250 #endif | |
| 0 | 1251 fclose(f); |
| 1252 } | |
| 1253 | |
| 18 | 1254 time_t starting = time(NULL); |
| 1255 int rc = smfi_main(); | |
| 22 | 1256 if ((rc != MI_SUCCESS) && (time(NULL) > starting+5*60)) { |
| 18 | 1257 my_syslog("trying to restart after smfi_main()"); |
| 1258 loader_run = false; // eventually the config loader thread will terminate | |
| 1259 execvp(argv[0], argv); | |
| 1260 } | |
| 1261 exit((rc == MI_SUCCESS) ? 0 : EX_UNAVAILABLE); | |
| 0 | 1262 } |
| 8 | 1263 |