Mercurial > dnsbl
annotate src/spamass.cpp.in @ 182:2b06183b9b25
embedded dcc filtering
| author | carl |
|---|---|
| date | Sat, 06 Oct 2007 17:10:13 -0700 |
| parents | a4d313c2460b |
| children | 92a5c866bdfa |
| rev | line source |
|---|---|
| 163 | 1 /* |
| 2 | |
| 3 Copyright (c) 2007 Carl Byington - 510 Software Group, released under | |
| 4 the GPL version 3 or any later version at your choice available at | |
| 5 http://www.gnu.org/licenses/gpl-3.0.txt | |
| 6 | |
| 7 Based on spamass-milter by Georg C. F. Greve <greve@gnu.org> | |
| 8 | |
| 9 */ | |
| 10 | |
| 177 | 11 #include "includes.h" |
| 163 | 12 #include <errno.h> |
| 13 #include <fcntl.h> | |
| 14 #include <poll.h> | |
| 15 #include <signal.h> | |
| 16 #include <string> | |
| 17 #include <sys/types.h> | |
| 18 #include <sys/wait.h> | |
| 19 #include <unistd.h> | |
| 20 | |
| 21 | |
| 22 static const char Id[] = "$Id$"; | |
| 23 | |
|
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24 char *spamc = "@SPAMC@"; |
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25 char *spamc_empty = ""; |
| 177 | 26 static bool warnedmacro = false; // have we logged that we couldn't fetch a macro? |
| 27 const int maxlen = 1000; // used for snprintf buffers | |
| 163 | 28 |
| 29 | |
|
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30 SpamAssassin::SpamAssassin(mlfiPriv *priv_, int ip, char *helo_, char *from, char *qid) |
| 163 | 31 { |
| 32 error = false; | |
| 33 running = false; | |
| 34 first_recipient = true; | |
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35 priv = priv_; |
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36 ip4 = ip; |
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37 helo = helo_; |
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38 envfrom = from; |
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39 queueid = qid; |
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40 pid = 0; |
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41 pipe_io[0][0] = -1; |
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carl
parents:
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42 pipe_io[0][1] = -1; |
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carl
parents:
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changeset
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43 pipe_io[1][0] = -1; |
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9b129ed78d7d
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carl
parents:
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changeset
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44 pipe_io[1][1] = -1; |
| 163 | 45 } |
| 46 | |
| 47 | |
| 48 SpamAssassin::~SpamAssassin() | |
| 49 { | |
| 50 // close all pipes that are still open | |
| 51 if (pipe_io[0][0] > -1) close(pipe_io[0][0]); | |
| 52 if (pipe_io[0][1] > -1) close(pipe_io[0][1]); | |
| 53 if (pipe_io[1][0] > -1) close(pipe_io[1][0]); | |
| 54 if (pipe_io[1][1] > -1) close(pipe_io[1][1]); | |
| 55 // child still running? | |
| 56 if (running) { | |
| 57 // make sure the pid is valid | |
| 58 if (pid > 0) { | |
| 59 // slaughter child | |
| 60 kill(pid, SIGKILL); | |
| 61 // wait for child to terminate | |
| 62 int status; | |
| 63 waitpid(pid, &status, 0); | |
| 64 } | |
| 65 } | |
| 66 } | |
| 67 | |
| 68 | |
| 69 void SpamAssassin::mlfi_envrcpt(SMFICTX *ctx, char *envrcpt) | |
| 70 { | |
| 71 if (first_recipient) { | |
| 177 | 72 first_recipient = false; |
| 163 | 73 /* Send the envelope headers as X-Envelope-From: and |
| 74 X-Envelope-To: so that SpamAssassin can use them in its | |
| 75 whitelist checks. Also forge as complete a dummy | |
| 76 Received: header as possible because SA gets a lot of | |
| 77 info from it. | |
| 78 | |
| 79 HReceived: $?sfrom $s $.$?_($?s$|from $.$_) | |
| 80 $.$?{auth_type}(authenticated$?{auth_ssf} bits=${auth_ssf}$.) | |
| 81 $.by $j ($v/$Z)$?r with $r$. id $i$?{tls_version} | |
| 82 (version=${tls_version} cipher=${cipher} bits=${cipher_bits} verify=${verify})$.$?u | |
| 83 for $u; $|; | |
| 84 $.$b$?g | |
| 85 (envelope-from $g)$. | |
| 86 | |
| 87 */ | |
| 88 const char *macro_b, *macro_i, *macro_j, *macro_r, | |
| 89 *macro_s, *macro_v, *macro_Z, *macro__; | |
| 90 char date[32]; | |
| 91 time_t tval; | |
| 92 time(&tval); | |
| 93 strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %z", localtime(&tval)); | |
| 94 macro_b = date; | |
| 95 | |
| 168 | 96 // queue ID |
| 163 | 97 macro_i = queueid; |
| 98 | |
| 168 | 99 // FQDN of this site |
| 100 macro_j = getorwarnmacro(ctx, "j", "localhost", "ENVRCPT"); | |
| 163 | 101 |
| 170 | 102 // Protocol used to receive the message, not really needed by spam assassin |
| 103 macro_r = "SMTP"; | |
| 163 | 104 |
| 170 | 105 // helo value we already have |
| 163 | 106 macro_s = helo; |
| 107 | |
| 170 | 108 // Sendmail binary version, not really needed by spam assassin |
| 109 macro_v = "8.13.0"; | |
| 163 | 110 |
| 170 | 111 // Sendmail .cf version, not really needed by spam assassin |
| 112 macro_Z = "8.13.0"; | |
| 163 | 113 |
| 168 | 114 // Validated sending site's address |
| 170 | 115 macro__ = getorwarnmacro(ctx, "_", "unknown", "ENVRCPT"); |
| 163 | 116 |
| 117 output(string("Received: from ") + macro_s + " (" + macro__+ ")\r\n\t" + | |
| 118 "by " + macro_j + " (" + macro_v + "/" + macro_Z + ") with " + macro_r + " id " + macro_i + "\r\n\t" + | |
| 119 "for " + envfrom + ";\r\n\t" + | |
| 120 macro_b + "\r\n"); | |
| 121 | |
| 122 output(string("X-Envelope-From: ") + envfrom + "\r\n"); | |
| 123 } | |
| 124 output(string("X-Envelope-To: ") + envrcpt + "\r\n"); | |
| 125 } | |
| 126 | |
| 127 | |
| 128 void SpamAssassin::mlfi_header(char* headerf, char* headerv) | |
| 129 { | |
| 130 if (!running) Connect(); | |
| 177 | 131 if (running) { |
| 132 output(spamc_input); | |
| 133 spamc_input.empty(); | |
| 134 } | |
| 135 | |
| 163 | 136 output(headerf); |
| 137 output(": "); | |
| 138 output(headerv); | |
| 139 output("\r\n"); | |
| 140 } | |
| 141 | |
| 142 | |
| 143 void SpamAssassin::mlfi_eoh() | |
| 144 { | |
| 145 output("\r\n"); | |
| 146 } | |
| 147 | |
| 148 | |
| 149 void SpamAssassin::mlfi_body(u_char *bodyp, size_t bodylen) | |
| 150 { | |
| 151 output((char *)bodyp, bodylen); | |
| 152 } | |
| 153 | |
| 154 | |
| 155 int SpamAssassin::mlfi_eom() | |
| 156 { | |
| 157 close_output(); // signal EOF to SpamAssassin | |
| 158 input(); // read what the Assassin is telling us | |
| 159 my_syslog(priv, "spamc returned " + spamc_output); | |
| 160 return atoi(spamc_output.c_str()); | |
| 161 } | |
| 162 | |
| 163 | |
| 164 void SpamAssassin::Connect() | |
| 165 { | |
| 166 if (error) return; | |
| 167 // set up pipes for in- and output | |
| 168 error |= (pipe(pipe_io[0])); | |
| 169 error |= (pipe(pipe_io[1])); | |
| 170 if (error) return; | |
| 171 | |
| 172 // now execute SpamAssassin client for contact with SpamAssassin spamd | |
| 173 // start child process | |
| 174 pid = fork(); | |
| 175 switch (pid) { | |
| 176 case -1: | |
| 177 // forking trouble. | |
| 178 my_syslog(priv, "unable to fork for spamc"); | |
| 179 error = true; | |
| 180 close(pipe_io[0][0]); | |
| 181 close(pipe_io[0][1]); | |
| 182 close(pipe_io[1][0]); | |
| 183 close(pipe_io[1][1]); | |
| 184 pipe_io[0][0] = -1; | |
| 185 pipe_io[0][1] = -1; | |
| 186 pipe_io[1][0] = -1; | |
| 187 pipe_io[1][1] = -1; | |
| 188 return; | |
| 189 case 0: | |
| 190 // +++ CHILD +++ | |
| 191 | |
| 192 // close unused pipes | |
| 193 close(pipe_io[1][0]); | |
| 194 close(pipe_io[0][1]); | |
| 195 | |
| 196 // redirect stdin(0), stdout(1) and stderr(2) | |
| 197 dup2(pipe_io[0][0],0); | |
| 198 dup2(pipe_io[1][1],1); | |
| 199 dup2(pipe_io[1][1],2); | |
| 200 | |
| 201 closeall(3); | |
| 202 | |
| 203 // execute spamc | |
| 204 char* argv[3]; | |
|
167
9b129ed78d7d
actually use spamassassin result, allow build without spam assassin, only call it if some recipient needs it.
carl
parents:
164
diff
changeset
|
205 argv[0] = spamc; |
| 163 | 206 argv[1] = "-c"; |
| 207 argv[2] = NULL; | |
| 208 execvp(argv[0] , argv); // does not return! | |
| 209 _exit(1); // exec failed | |
| 210 break; | |
| 211 } | |
| 212 | |
| 213 // +++ PARENT +++ | |
| 214 | |
| 215 // close unused pipes | |
| 216 close(pipe_io[0][0]); | |
| 217 close(pipe_io[1][1]); | |
| 218 pipe_io[0][0] = -1; | |
| 219 pipe_io[1][1] = -1; | |
| 220 | |
| 221 // mark the pipes non-blocking | |
| 222 if (fcntl(pipe_io[0][1], F_SETFL, O_NONBLOCK) == -1) | |
| 223 error = true; | |
| 224 #if 0 /* don't really need to make the sink pipe nonblocking */ | |
| 225 if (fcntl(pipe_io[1][0], F_SETFL, O_NONBLOCK) == -1) | |
| 226 error = true; | |
| 227 #endif | |
| 228 | |
| 229 // we have to assume the client is running now. | |
| 230 running = true; | |
| 231 } | |
| 232 | |
| 233 | |
| 234 void SpamAssassin::output(const char* buffer, size_t size) | |
| 235 { | |
| 236 // if there are problems, fail. | |
| 237 if (error) return; | |
| 238 | |
| 239 if (!running) { | |
| 240 // buffer it | |
| 241 spamc_input.append(buffer, size); | |
| 242 return; | |
| 243 } | |
| 244 | |
| 245 // send to SpamAssassin | |
| 246 long total = 0; | |
| 247 long wsize = 0; | |
| 248 string reason; | |
| 249 int status; | |
| 250 do { | |
| 251 struct pollfd fds[2]; | |
| 252 int nfds = 2, nready; | |
| 253 fds[0].fd = pipe_io[0][1]; | |
| 254 fds[0].events = POLLOUT; | |
| 255 fds[0].revents = 0; | |
| 256 fds[1].fd = pipe_io[1][0]; | |
| 257 fds[1].events = POLLIN; | |
| 258 fds[1].revents = 0; | |
| 259 | |
| 260 nready = poll(fds, nfds, 1000); | |
| 261 if (nready == -1) { | |
| 262 my_syslog(priv, "poll failed"); | |
| 263 error = true; | |
| 264 return; | |
| 265 } | |
| 266 | |
| 267 if (fds[1].revents & (POLLERR|POLLNVAL|POLLHUP)) { | |
| 268 my_syslog(priv, "poll says my read pipe is busted"); | |
| 269 error = true; | |
| 270 return; | |
| 271 } | |
| 272 | |
| 273 if (fds[0].revents & (POLLERR|POLLNVAL|POLLHUP)) { | |
| 274 my_syslog(priv, "poll says my write pipe is busted"); | |
| 275 error = true; | |
| 276 return; | |
| 277 } | |
| 278 | |
| 279 if (fds[1].revents & POLLIN) { | |
| 280 read_pipe(); | |
| 281 } | |
| 282 | |
| 283 if (fds[0].revents & POLLOUT) { | |
| 284 switch(wsize = write(pipe_io[0][1], (char *)buffer + total, size - total)) { | |
| 285 case -1: | |
| 286 if (errno == EAGAIN) continue; | |
| 287 reason = string(strerror(errno)); | |
| 288 // close the pipes | |
| 289 close(pipe_io[0][1]); | |
| 290 close(pipe_io[1][0]); | |
| 291 pipe_io[0][1] = -1; | |
| 292 pipe_io[1][0] = -1; | |
| 293 // Slaughter child | |
| 294 kill(pid, SIGKILL); | |
| 295 // wait for child to terminate | |
| 296 waitpid(pid, &status, 0); | |
| 297 my_syslog(priv, "write error: " + reason); | |
| 298 error = true; | |
| 299 running = false; | |
| 300 return; | |
| 301 default: | |
| 302 total += wsize; | |
| 303 break; | |
| 304 } | |
| 305 } | |
| 306 } while ( total < size ); | |
| 307 } | |
| 308 | |
| 309 | |
| 310 void SpamAssassin::output(const char* buffer) | |
| 311 { | |
| 312 output(buffer, strlen(buffer)); | |
| 313 } | |
| 314 | |
| 315 | |
| 316 void SpamAssassin::output(string buffer) | |
| 317 { | |
| 318 output(buffer.c_str(), buffer.size()); | |
| 319 } | |
| 320 | |
| 321 | |
| 322 void SpamAssassin::close_output() | |
| 323 { | |
| 324 if (close(pipe_io[0][1])) | |
| 325 my_syslog(priv, "close error: " + string(strerror(errno))); | |
| 326 pipe_io[0][1] = -1; | |
| 327 } | |
| 328 | |
| 329 | |
| 330 void SpamAssassin::input() | |
| 331 { | |
| 332 if (!running || error) return; | |
| 333 empty_and_close_pipe(); | |
| 334 if (running) { | |
| 335 // wait until child is dead | |
| 336 int status; | |
| 337 if (waitpid(pid, &status, 0) < 0) { | |
| 338 error = true; | |
| 339 }; | |
| 340 } | |
| 341 running = false; | |
| 342 } | |
| 343 | |
| 344 | |
| 345 int SpamAssassin::read_pipe() | |
| 346 { | |
| 347 long size; | |
| 348 int status; | |
| 349 char iobuff[1024]; | |
| 350 string reason; | |
| 351 | |
| 352 if (pipe_io[1][0] == -1) return 0; | |
| 353 | |
| 354 size = read(pipe_io[1][0], iobuff, 1024); | |
| 355 | |
| 356 if (size < 0) { | |
| 357 reason = string(strerror(errno)); | |
| 358 // Close remaining pipe. | |
| 359 close(pipe_io[1][0]); | |
| 360 pipe_io[1][0] = -1; | |
| 361 // Slaughter child | |
| 362 kill(pid, SIGKILL); | |
| 363 // wait for child to terminate | |
| 364 waitpid(pid, &status, 0); | |
| 365 my_syslog(priv, "read error: " + reason); | |
| 366 size = 0; | |
| 367 error = true; | |
| 368 running = false; | |
| 369 } else if (size == 0) { | |
| 370 // EOF. Close the pipe | |
| 371 if (close(pipe_io[1][0])) { | |
| 372 error = true; | |
| 373 my_syslog(priv, "close error: " + string(strerror(errno))); | |
| 374 } | |
| 375 pipe_io[1][0] = -1; | |
| 376 } else { | |
| 377 // append to mail buffer | |
| 378 spamc_output.append(iobuff, size); | |
| 379 } | |
| 380 return size; | |
| 381 } | |
| 382 | |
| 383 | |
| 384 void SpamAssassin::empty_and_close_pipe() | |
| 385 { | |
| 386 while (read_pipe()) | |
| 387 ; | |
| 388 } | |
| 389 | |
| 390 | |
| 391 void SpamAssassin::closeall(int fd) | |
| 392 { | |
| 393 int fdlimit = sysconf(_SC_OPEN_MAX); | |
| 394 while (fd < fdlimit) | |
| 395 close(fd++); | |
| 396 } | |
| 397 | |
| 398 | |
| 168 | 399 char *SpamAssassin::getorwarnmacro(SMFICTX *ctx, char *macro, char *def, char *scope) |
| 400 { | |
| 401 char *rc = smfi_getsymval(ctx, macro); | |
| 402 if (!rc) { | |
| 403 rc = def; | |
| 404 warnmacro(macro, scope); | |
| 405 } | |
| 406 return rc; | |
| 407 } | |
| 408 | |
| 409 | |
| 163 | 410 void SpamAssassin::warnmacro(char *macro, char *scope) |
| 411 { | |
| 412 if (warnedmacro) return; | |
| 413 char buf[maxlen]; | |
| 414 snprintf(buf, sizeof(buf), "Could not retrieve sendmail macro %s. Add it to confMILTER_MACROS_%s for better results.", macro, scope); | |
| 415 my_syslog(priv, buf); | |
| 416 warnedmacro = true; | |
| 417 } | |
| 418 |