1 /* 2 * Copyright (c) 1983 Eric P. Allman 3 * Copyright (c) 1988, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * %sccs.include.redist.c% 7 */ 8 9 #ifndef lint 10 static char sccsid[] = "@(#)collect.c 8.26 (Berkeley) 11/05/94"; 11 #endif /* not lint */ 12 13 # include <errno.h> 14 # include "sendmail.h" 15 16 /* 17 ** COLLECT -- read & parse message header & make temp file. 18 ** 19 ** Creates a temporary file name and copies the standard 20 ** input to that file. Leading UNIX-style "From" lines are 21 ** stripped off (after important information is extracted). 22 ** 23 ** Parameters: 24 ** fp -- file to read. 25 ** smtpmode -- if set, we are running SMTP: give an RFC821 26 ** style message to say we are ready to collect 27 ** input, and never ignore a single dot to mean 28 ** end of message. 29 ** requeueflag -- this message will be requeued later, so 30 ** don't do final processing on it. 31 ** hdrp -- the location to stash the header. 32 ** e -- the current envelope. 33 ** 34 ** Returns: 35 ** none. 36 ** 37 ** Side Effects: 38 ** Temp file is created and filled. 39 ** The from person may be set. 40 */ 41 42 char *CollectErrorMessage; 43 bool CollectErrno; 44 45 static jmp_buf CtxCollectTimeout; 46 static int collecttimeout(); 47 static bool CollectProgress; 48 static EVENT *CollectTimeout; 49 50 /* values for input state machine */ 51 #define IS_NORM 0 /* middle of line */ 52 #define IS_BOL 1 /* beginning of line */ 53 #define IS_DOT 2 /* read a dot at beginning of line */ 54 #define IS_DOTCR 3 /* read ".\r" at beginning of line */ 55 #define IS_CR 4 /* read a carriage return */ 56 57 /* values for message state machine */ 58 #define MS_UFROM 0 /* reading Unix from line */ 59 #define MS_HEADER 1 /* reading message header */ 60 #define MS_BODY 2 /* reading message body */ 61 62 63 collect(fp, smtpmode, requeueflag, hdrp, e) 64 FILE *fp; 65 bool smtpmode; 66 bool requeueflag; 67 HDR **hdrp; 68 register ENVELOPE *e; 69 { 70 register FILE *tf; 71 bool ignrdot = smtpmode ? FALSE : IgnrDot; 72 time_t dbto = smtpmode ? TimeOuts.to_datablock : 0; 73 register char *bp; 74 register int c; 75 bool inputerr = FALSE; 76 bool headeronly = FALSE; 77 char *buf; 78 int buflen; 79 int istate; 80 int mstate; 81 char *pbp; 82 char peekbuf[8]; 83 char bufbuf[MAXLINE]; 84 extern bool isheader(); 85 86 CollectErrorMessage = NULL; 87 CollectErrno = 0; 88 if (hdrp == NULL) 89 hdrp = &e->e_header; 90 else 91 headeronly = TRUE; 92 93 /* 94 ** Create the temp file name and create the file. 95 */ 96 97 if (!headeronly) 98 { 99 struct stat stbuf; 100 101 e->e_df = queuename(e, 'd'); 102 e->e_df = newstr(e->e_df); 103 if ((tf = dfopen(e->e_df, O_WRONLY|O_CREAT|O_TRUNC, FileMode)) == NULL) 104 { 105 syserr("Cannot create %s", e->e_df); 106 e->e_flags |= EF_NORETURN; 107 finis(); 108 } 109 if (fstat(fileno(tf), &stbuf) < 0) 110 e->e_dfino = -1; 111 else 112 { 113 e->e_dfdev = stbuf.st_dev; 114 e->e_dfino = stbuf.st_ino; 115 } 116 HasEightBits = FALSE; 117 } 118 119 /* 120 ** Tell ARPANET to go ahead. 121 */ 122 123 if (smtpmode) 124 message("354 Enter mail, end with \".\" on a line by itself"); 125 126 /* 127 ** Read the message. 128 ** 129 ** This is done using two interleaved state machines. 130 ** The input state machine is looking for things like 131 ** hidden dots; the message state machine is handling 132 ** the larger picture (e.g., header versus body). 133 */ 134 135 buf = bp = bufbuf; 136 buflen = sizeof bufbuf; 137 pbp = peekbuf; 138 istate = IS_BOL; 139 mstate = SaveFrom ? MS_HEADER : MS_UFROM; 140 CollectProgress = FALSE; 141 142 /* if transmitting binary, don't map NL to EOL */ 143 if (e->e_bodytype != NULL && strcasecmp(e->e_bodytype, "8BITMIME") == 0) 144 e->e_flags |= EF_NL_NOT_EOL; 145 146 if (dbto != 0) 147 { 148 /* handle possible input timeout */ 149 if (setjmp(CtxCollectTimeout) != 0) 150 { 151 #ifdef LOG 152 syslog(LOG_NOTICE, 153 "timeout waiting for input from %s during message collect", 154 CurHostName ? CurHostName : "<local machine>"); 155 #endif 156 errno = 0; 157 usrerr("451 timeout waiting for input during message collect"); 158 goto readerr; 159 } 160 CollectTimeout = setevent(dbto, collecttimeout, dbto); 161 } 162 163 for (;;) 164 { 165 if (tTd(30, 35)) 166 printf("top, istate=%d, mstate=%d\n", istate, mstate); 167 for (;;) 168 { 169 if (pbp > peekbuf) 170 c = *--pbp; 171 else 172 { 173 while (!feof(InChannel) && !ferror(InChannel)) 174 { 175 errno = 0; 176 c = fgetc(InChannel); 177 if (errno != EINTR) 178 break; 179 clearerr(InChannel); 180 } 181 CollectProgress = TRUE; 182 if (TrafficLogFile != NULL) 183 { 184 if (istate == IS_BOL) 185 fprintf(TrafficLogFile, "%05d <<< ", 186 getpid()); 187 if (c == EOF) 188 fprintf(TrafficLogFile, "[EOF]\n"); 189 else 190 fputc(c, TrafficLogFile); 191 } 192 if (c == EOF) 193 goto readerr; 194 if (SevenBitInput) 195 c &= 0x7f; 196 else 197 HasEightBits |= bitset(0x80, c); 198 e->e_msgsize++; 199 } 200 if (tTd(30, 94)) 201 printf("istate=%d, c=%c (0x%x)\n", 202 istate, c, c); 203 switch (istate) 204 { 205 case IS_BOL: 206 if (c == '.') 207 { 208 istate = IS_DOT; 209 continue; 210 } 211 break; 212 213 case IS_DOT: 214 if (c == '\n' && !ignrdot && 215 !bitset(EF_NL_NOT_EOL, e->e_flags)) 216 goto readerr; 217 else if (c == '\r' && 218 !bitset(EF_CRLF_NOT_EOL, e->e_flags)) 219 { 220 istate = IS_DOTCR; 221 continue; 222 } 223 else if (c != '.' || 224 (OpMode != MD_SMTP && 225 OpMode != MD_DAEMON && 226 OpMode != MD_ARPAFTP)) 227 { 228 *pbp++ = c; 229 c = '.'; 230 } 231 break; 232 233 case IS_DOTCR: 234 if (c == '\n') 235 goto readerr; 236 else 237 { 238 /* push back the ".\rx" */ 239 *pbp++ = c; 240 *pbp++ = '\r'; 241 c = '.'; 242 } 243 break; 244 245 case IS_CR: 246 if (c == '\n') 247 istate = IS_BOL; 248 else 249 { 250 ungetc(c, InChannel); 251 c = '\r'; 252 istate = IS_NORM; 253 } 254 goto bufferchar; 255 } 256 257 if (c == '\r' && !bitset(EF_CRLF_NOT_EOL, e->e_flags)) 258 { 259 istate = IS_CR; 260 continue; 261 } 262 else if (c == '\n' && !bitset(EF_NL_NOT_EOL, e->e_flags)) 263 istate = IS_BOL; 264 else 265 istate = IS_NORM; 266 267 bufferchar: 268 if (mstate == MS_BODY) 269 { 270 /* just put the character out */ 271 if (MaxMessageSize <= 0 || 272 e->e_msgsize <= MaxMessageSize) 273 fputc(c, tf); 274 continue; 275 } 276 277 /* header -- buffer up */ 278 if (bp >= &buf[buflen - 2]) 279 { 280 char *obuf; 281 282 if (mstate != MS_HEADER) 283 break; 284 285 /* out of space for header */ 286 obuf = buf; 287 if (buflen < MEMCHUNKSIZE) 288 buflen *= 2; 289 else 290 buflen += MEMCHUNKSIZE; 291 buf = xalloc(buflen); 292 bcopy(obuf, buf, bp - obuf); 293 bp = &buf[bp - obuf]; 294 if (obuf != bufbuf) 295 free(obuf); 296 } 297 *bp++ = c; 298 if (istate == IS_BOL) 299 break; 300 } 301 *bp = '\0'; 302 303 nextstate: 304 if (tTd(30, 35)) 305 printf("nextstate, istate=%d, mstate=%d, line = \"%s\"\n", 306 istate, mstate, buf); 307 switch (mstate) 308 { 309 case MS_UFROM: 310 mstate = MS_HEADER; 311 if (strncmp(buf, "From ", 5) == 0) 312 { 313 bp = buf; 314 eatfrom(buf, e); 315 continue; 316 } 317 /* fall through */ 318 319 case MS_HEADER: 320 if (!isheader(buf)) 321 { 322 mstate = MS_BODY; 323 goto nextstate; 324 } 325 326 /* check for possible continuation line */ 327 do 328 { 329 clearerr(InChannel); 330 errno = 0; 331 c = fgetc(InChannel); 332 } while (errno == EINTR); 333 if (c != EOF) 334 ungetc(c, InChannel); 335 if (c == ' ' || c == '\t') 336 { 337 /* yep -- defer this */ 338 continue; 339 } 340 341 /* trim off trailing CRLF or NL */ 342 if (*--bp != '\n' || *--bp != '\r') 343 bp++; 344 *bp = '\0'; 345 if (bitset(H_EOH, chompheader(buf, FALSE, e))) 346 mstate = MS_BODY; 347 break; 348 349 case MS_BODY: 350 if (tTd(30, 1)) 351 printf("EOH\n"); 352 if (headeronly) 353 goto readerr; 354 bp = buf; 355 356 /* toss blank line */ 357 if ((!bitset(EF_CRLF_NOT_EOL, e->e_flags) && 358 bp[0] == '\r' && bp[1] == '\n') || 359 (!bitset(EF_NL_NOT_EOL, e->e_flags) && 360 bp[0] == '\n')) 361 { 362 break; 363 } 364 365 /* if not a blank separator, write it out */ 366 if (MaxMessageSize <= 0 || 367 e->e_msgsize <= MaxMessageSize) 368 { 369 while (*bp != '\0') 370 fputc(*bp++, tf); 371 } 372 break; 373 } 374 bp = buf; 375 } 376 377 readerr: 378 if ((feof(fp) && smtpmode) || ferror(fp)) 379 { 380 if (tTd(30, 1)) 381 printf("collect: read error\n"); 382 inputerr = TRUE; 383 } 384 385 /* reset global timer */ 386 clrevent(CollectTimeout); 387 388 if (headeronly) 389 return; 390 391 if (tf != NULL) 392 { 393 if (fflush(tf) != 0) 394 tferror(tf, e); 395 if (fsync(fileno(tf)) < 0 || fclose(tf) < 0) 396 { 397 tferror(tf, e); 398 finis(); 399 } 400 } 401 402 if (CollectErrorMessage != NULL && Errors <= 0) 403 { 404 if (CollectErrno != 0) 405 { 406 errno = CollectErrno; 407 syserr(CollectErrorMessage, e->e_df); 408 finis(); 409 } 410 usrerr(CollectErrorMessage); 411 } 412 else if (inputerr && (OpMode == MD_SMTP || OpMode == MD_DAEMON)) 413 { 414 /* An EOF when running SMTP is an error */ 415 char *host; 416 char *problem; 417 418 host = RealHostName; 419 if (host == NULL) 420 host = "localhost"; 421 422 if (feof(fp)) 423 problem = "unexpected close"; 424 else if (ferror(fp)) 425 problem = "I/O error"; 426 else 427 problem = "read timeout"; 428 # ifdef LOG 429 if (LogLevel > 0 && feof(fp)) 430 syslog(LOG_NOTICE, 431 "collect: %s on connection from %s, sender=%s: %s\n", 432 problem, host, e->e_from.q_paddr, errstring(errno)); 433 # endif 434 if (feof(fp)) 435 usrerr("451 collect: %s on connection from %s, from=%s", 436 problem, host, e->e_from.q_paddr); 437 else 438 syserr("451 collect: %s on connection from %s, from=%s", 439 problem, host, e->e_from.q_paddr); 440 441 /* don't return an error indication */ 442 e->e_to = NULL; 443 e->e_flags &= ~EF_FATALERRS; 444 e->e_flags |= EF_CLRQUEUE; 445 446 /* and don't try to deliver the partial message either */ 447 if (InChild) 448 ExitStat = EX_QUIT; 449 finis(); 450 } 451 452 /* 453 ** Find out some information from the headers. 454 ** Examples are who is the from person & the date. 455 */ 456 457 eatheader(e, !requeueflag); 458 459 /* collect statistics */ 460 if (OpMode != MD_VERIFY) 461 markstats(e, (ADDRESS *) NULL); 462 463 /* 464 ** Add an Apparently-To: line if we have no recipient lines. 465 */ 466 467 if (hvalue("to", e->e_header) == NULL && 468 hvalue("cc", e->e_header) == NULL && 469 hvalue("bcc", e->e_header) == NULL && 470 hvalue("apparently-to", e->e_header) == NULL) 471 { 472 register ADDRESS *q; 473 474 /* create an Apparently-To: field */ 475 /* that or reject the message.... */ 476 for (q = e->e_sendqueue; q != NULL; q = q->q_next) 477 { 478 if (q->q_alias != NULL) 479 continue; 480 if (tTd(30, 3)) 481 printf("Adding Apparently-To: %s\n", q->q_paddr); 482 addheader("Apparently-To", q->q_paddr, &e->e_header); 483 } 484 } 485 486 /* check for message too large */ 487 if (MaxMessageSize > 0 && e->e_msgsize > MaxMessageSize) 488 { 489 usrerr("552 Message exceeds maximum fixed size (%ld)", 490 MaxMessageSize); 491 } 492 493 /* check for illegal 8-bit data */ 494 if (HasEightBits) 495 { 496 e->e_flags |= EF_HAS8BIT; 497 if (!bitset(MM_PASS8BIT|MM_MIME8BIT, MimeMode)) 498 usrerr("554 Eight bit data not allowed"); 499 } 500 501 if ((e->e_dfp = fopen(e->e_df, "r")) == NULL) 502 { 503 /* we haven't acked receipt yet, so just chuck this */ 504 syserr("Cannot reopen %s", e->e_df); 505 finis(); 506 } 507 } 508 509 510 static 511 collecttimeout(timeout) 512 time_t timeout; 513 { 514 /* if no progress was made, die now */ 515 if (!CollectProgress) 516 longjmp(CtxCollectTimeout, 1); 517 518 /* otherwise reset the timeout */ 519 CollectTimeout = setevent(timeout, collecttimeout, timeout); 520 CollectProgress = FALSE; 521 } 522 /* 523 ** TFERROR -- signal error on writing the temporary file. 524 ** 525 ** Parameters: 526 ** tf -- the file pointer for the temporary file. 527 ** 528 ** Returns: 529 ** none. 530 ** 531 ** Side Effects: 532 ** Gives an error message. 533 ** Arranges for following output to go elsewhere. 534 */ 535 536 tferror(tf, e) 537 FILE *tf; 538 register ENVELOPE *e; 539 { 540 CollectErrno = errno; 541 if (errno == ENOSPC) 542 { 543 struct stat st; 544 long avail; 545 long bsize; 546 547 e->e_flags |= EF_NORETURN; 548 if (fstat(fileno(tf), &st) < 0) 549 st.st_size = 0; 550 (void) freopen(e->e_df, "w", tf); 551 if (st.st_size <= 0) 552 fprintf(tf, "\n*** Mail could not be accepted"); 553 else if (sizeof st.st_size > sizeof (long)) 554 fprintf(tf, "\n*** Mail of at least %qd bytes could not be accepted\n", 555 st.st_size); 556 else 557 fprintf(tf, "\n*** Mail of at least %ld bytes could not be accepted\n", 558 st.st_size); 559 fprintf(tf, "*** at %s due to lack of disk space for temp file.\n", 560 MyHostName); 561 avail = freespace(QueueDir, &bsize); 562 if (avail > 0) 563 { 564 if (bsize > 1024) 565 avail *= bsize / 1024; 566 else if (bsize < 1024) 567 avail /= 1024 / bsize; 568 fprintf(tf, "*** Currently, %ld kilobytes are available for mail temp files.\n", 569 avail); 570 } 571 CollectErrorMessage = "452 Out of disk space for temp file"; 572 } 573 else 574 { 575 CollectErrorMessage = "cannot write message body to disk (%s)"; 576 } 577 (void) freopen("/dev/null", "w", tf); 578 } 579 /* 580 ** EATFROM -- chew up a UNIX style from line and process 581 ** 582 ** This does indeed make some assumptions about the format 583 ** of UNIX messages. 584 ** 585 ** Parameters: 586 ** fm -- the from line. 587 ** 588 ** Returns: 589 ** none. 590 ** 591 ** Side Effects: 592 ** extracts what information it can from the header, 593 ** such as the date. 594 */ 595 596 # ifndef NOTUNIX 597 598 char *DowList[] = 599 { 600 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", NULL 601 }; 602 603 char *MonthList[] = 604 { 605 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 606 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", 607 NULL 608 }; 609 610 eatfrom(fm, e) 611 char *fm; 612 register ENVELOPE *e; 613 { 614 register char *p; 615 register char **dt; 616 617 if (tTd(30, 2)) 618 printf("eatfrom(%s)\n", fm); 619 620 /* find the date part */ 621 p = fm; 622 while (*p != '\0') 623 { 624 /* skip a word */ 625 while (*p != '\0' && *p != ' ') 626 p++; 627 while (*p == ' ') 628 p++; 629 if (!(isascii(*p) && isupper(*p)) || 630 p[3] != ' ' || p[13] != ':' || p[16] != ':') 631 continue; 632 633 /* we have a possible date */ 634 for (dt = DowList; *dt != NULL; dt++) 635 if (strncmp(*dt, p, 3) == 0) 636 break; 637 if (*dt == NULL) 638 continue; 639 640 for (dt = MonthList; *dt != NULL; dt++) 641 if (strncmp(*dt, &p[4], 3) == 0) 642 break; 643 if (*dt != NULL) 644 break; 645 } 646 647 if (*p != '\0') 648 { 649 char *q; 650 extern char *arpadate(); 651 652 /* we have found a date */ 653 q = xalloc(25); 654 (void) strncpy(q, p, 25); 655 q[24] = '\0'; 656 q = arpadate(q); 657 define('a', newstr(q), e); 658 } 659 } 660 661 # endif /* NOTUNIX */ 662