1 /* 2 * Copyright (c) 2008 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Simon 'corecode' Schubert <corecode@fs.ei.tum.de>. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <errno.h> 36 #include <syslog.h> 37 #include <unistd.h> 38 39 #include "dma.h" 40 41 void 42 bounce(struct qitem *it, const char *reason) 43 { 44 struct queue bounceq; 45 char line[1000]; 46 size_t pos; 47 int error; 48 49 /* Don't bounce bounced mails */ 50 if (it->sender[0] == 0) { 51 syslog(LOG_INFO, "can not bounce a bounce message, discarding"); 52 exit(1); 53 } 54 55 bzero(&bounceq, sizeof(bounceq)); 56 LIST_INIT(&bounceq.queue); 57 bounceq.sender = ""; 58 if (add_recp(&bounceq, it->sender, 1) != 0) 59 goto fail; 60 61 if (newspoolf(&bounceq) != 0) 62 goto fail; 63 64 syslog(LOG_ERR, "delivery failed, bouncing as %s", bounceq.id); 65 setlogident("%s", bounceq.id); 66 67 error = fprintf(bounceq.mailf, 68 "Received: from MAILER-DAEMON\n" 69 "\tid %s\n" 70 "\tby %s (%s)\n" 71 "\t%s\n" 72 "X-Original-To: <%s>\n" 73 "From: MAILER-DAEMON <>\n" 74 "To: %s\n" 75 "Subject: Mail delivery failed\n" 76 "Message-Id: <%s@%s>\n" 77 "Date: %s\n" 78 "\n" 79 "This is the %s at %s.\n" 80 "\n" 81 "There was an error delivering your mail to <%s>.\n" 82 "\n" 83 "%s\n" 84 "\n" 85 "%s\n" 86 "\n", 87 bounceq.id, 88 hostname(), VERSION, 89 rfc822date(), 90 it->addr, 91 it->sender, 92 bounceq.id, hostname(), 93 rfc822date(), 94 VERSION, hostname(), 95 it->addr, 96 reason, 97 config.features & FULLBOUNCE ? 98 "Original message follows." : 99 "Message headers follow."); 100 if (error < 0) 101 goto fail; 102 103 if (fseek(it->mailf, 0, SEEK_SET) != 0) 104 goto fail; 105 if (config.features & FULLBOUNCE) { 106 while ((pos = fread(line, 1, sizeof(line), it->mailf)) > 0) { 107 if (fwrite(line, 1, pos, bounceq.mailf) != pos) 108 goto fail; 109 } 110 } else { 111 while (!feof(it->mailf)) { 112 if (fgets(line, sizeof(line), it->mailf) == NULL) 113 break; 114 if (line[0] == '\n') 115 break; 116 if (fwrite(line, strlen(line), 1, bounceq.mailf) != 1) 117 goto fail; 118 } 119 } 120 121 if (linkspool(&bounceq) != 0) 122 goto fail; 123 /* bounce is safe */ 124 125 delqueue(it); 126 127 run_queue(&bounceq); 128 /* NOTREACHED */ 129 130 fail: 131 syslog(LOG_CRIT, "error creating bounce: %m"); 132 delqueue(it); 133 exit(1); 134 } 135 136 struct parse_state { 137 char addr[1000]; 138 int pos; 139 140 enum { 141 NONE = 0, 142 START, 143 MAIN, 144 EOL, 145 QUIT 146 } state; 147 int comment; 148 int quote; 149 int brackets; 150 int esc; 151 }; 152 153 /* 154 * Simplified RFC2822 header/address parsing. 155 * We copy escapes and quoted strings directly, since 156 * we have to pass them like this to the mail server anyways. 157 * XXX local addresses will need treatment 158 */ 159 static int 160 parse_addrs(struct parse_state *ps, char *s, struct queue *queue) 161 { 162 char *addr; 163 164 again: 165 switch (ps->state) { 166 case NONE: 167 return (-1); 168 169 case START: 170 /* init our data */ 171 bzero(ps, sizeof(*ps)); 172 173 /* skip over header name */ 174 while (*s != ':') 175 s++; 176 s++; 177 ps->state = MAIN; 178 break; 179 180 case MAIN: 181 /* all fine */ 182 break; 183 184 case EOL: 185 switch (*s) { 186 case ' ': 187 case '\t': 188 s++; 189 /* continue */ 190 break; 191 192 default: 193 ps->state = QUIT; 194 if (ps->pos != 0) 195 goto newaddr; 196 return (0); 197 } 198 199 case QUIT: 200 return (0); 201 } 202 203 for (; *s != 0; s++) { 204 if (ps->esc) { 205 ps->esc = 0; 206 207 switch (*s) { 208 case '\r': 209 case '\n': 210 goto err; 211 212 default: 213 goto copy; 214 } 215 } 216 217 if (ps->quote) { 218 switch (*s) { 219 case '"': 220 ps->quote = 0; 221 goto copy; 222 223 case '\\': 224 ps->esc = 1; 225 goto copy; 226 227 case '\r': 228 case '\n': 229 goto eol; 230 231 default: 232 goto copy; 233 } 234 } 235 236 switch (*s) { 237 case '(': 238 ps->comment++; 239 break; 240 241 case ')': 242 if (ps->comment) 243 ps->comment--; 244 else 245 goto err; 246 goto skip; 247 248 case '"': 249 ps->quote = 1; 250 goto copy; 251 252 case '\\': 253 ps->esc = 1; 254 goto copy; 255 256 case '\r': 257 case '\n': 258 goto eol; 259 } 260 261 if (ps->comment) 262 goto skip; 263 264 switch (*s) { 265 case ' ': 266 case '\t': 267 /* ignore whitespace */ 268 goto skip; 269 270 case '<': 271 ps->brackets = 1; 272 goto skip; 273 274 case '>': 275 if (!ps->brackets) 276 goto err; 277 ps->brackets = 0; 278 279 s++; 280 goto newaddr; 281 282 case ':': 283 /* group - ignore */ 284 ps->pos = 0; 285 goto skip; 286 287 case ',': 288 case ';': 289 s++; 290 goto newaddr; 291 292 default: 293 goto copy; 294 } 295 296 copy: 297 if (ps->comment) 298 goto skip; 299 300 if (ps->pos + 1 == sizeof(ps->addr)) 301 goto err; 302 ps->addr[ps->pos++] = *s; 303 304 skip: 305 ; 306 } 307 308 eol: 309 ps->state = EOL; 310 return (0); 311 312 err: 313 ps->state = QUIT; 314 return (-1); 315 316 newaddr: 317 ps->addr[ps->pos] = 0; 318 ps->pos = 0; 319 addr = strdup(ps->addr); 320 if (addr == NULL) 321 errlog(1, NULL); 322 323 add_recp(queue, addr, 1); 324 fprintf(stderr, "parsed `%s'\n", addr); 325 goto again; 326 } 327 328 int 329 readmail(struct queue *queue, int nodot, int recp_from_header) 330 { 331 struct parse_state parse_state; 332 char line[1000]; /* by RFC2822 */ 333 size_t linelen; 334 size_t error; 335 int had_headers = 0; 336 int had_from = 0; 337 int had_messagid = 0; 338 int had_date = 0; 339 int nocopy = 0; 340 341 parse_state.state = NONE; 342 343 error = fprintf(queue->mailf, 344 "Received: from %s (uid %d)\n" 345 "\t(envelope-from %s)\n" 346 "\tid %s\n" 347 "\tby %s (%s)\n" 348 "\t%s\n", 349 username, getuid(), 350 queue->sender, 351 queue->id, 352 hostname(), VERSION, 353 rfc822date()); 354 if ((ssize_t)error < 0) 355 return (-1); 356 357 while (!feof(stdin)) { 358 if (fgets(line, sizeof(line), stdin) == NULL) 359 break; 360 linelen = strlen(line); 361 if (linelen == 0 || line[linelen - 1] != '\n') { 362 errno = EINVAL; /* XXX mark permanent errors */ 363 return (-1); 364 } 365 if (!had_headers) { 366 /* 367 * Unless this is a continuation, switch of 368 * the Bcc: nocopy flag. 369 */ 370 if (!(line[0] == ' ' || line[0] == '\t')) 371 nocopy = 0; 372 373 if (strprefixcmp(line, "Date:") == 0) 374 had_date = 1; 375 else if (strprefixcmp(line, "Message-Id:") == 0) 376 had_messagid = 1; 377 else if (strprefixcmp(line, "From:") == 0) 378 had_from = 1; 379 else if (strprefixcmp(line, "Bcc:") == 0) 380 nocopy = 1; 381 382 if (parse_state.state != NONE) { 383 if (parse_addrs(&parse_state, line, queue) < 0) { 384 errlogx(1, "invalid address in header\n"); 385 /* NOTREACHED */ 386 } 387 } 388 389 if (recp_from_header && ( 390 strprefixcmp(line, "To:") == 0 || 391 strprefixcmp(line, "Cc:") == 0 || 392 strprefixcmp(line, "Bcc:") == 0)) { 393 parse_state.state = START; 394 if (parse_addrs(&parse_state, line, queue) < 0) { 395 errlogx(1, "invalid address in header\n"); 396 /* NOTREACHED */ 397 } 398 } 399 } 400 401 if (strcmp(line, "\n") == 0 && !had_headers) { 402 had_headers = 1; 403 while (!had_date || !had_messagid || !had_from) { 404 if (!had_date) { 405 had_date = 1; 406 snprintf(line, sizeof(line), "Date: %s\n", rfc822date()); 407 } else if (!had_messagid) { 408 /* XXX better msgid, assign earlier and log? */ 409 had_messagid = 1; 410 snprintf(line, sizeof(line), "Message-Id: <%s@%s>\n", 411 queue->id, hostname()); 412 } else if (!had_from) { 413 had_from = 1; 414 snprintf(line, sizeof(line), "From: <%s>\n", queue->sender); 415 } 416 if (fwrite(line, strlen(line), 1, queue->mailf) != 1) 417 return (-1); 418 } 419 strcpy(line, "\n"); 420 } 421 if (!nodot && linelen == 2 && line[0] == '.') 422 break; 423 if (!nocopy) { 424 if (fwrite(line, strlen(line), 1, queue->mailf) != 1) 425 return (-1); 426 } 427 } 428 429 return (0); 430 } 431