1 # include <stdio.h> 2 # include <pwd.h> 3 # include <signal.h> 4 # include "dlvrmail.h" 5 # ifdef LOG 6 # include <log.h> 7 # endif LOG 8 9 static char SccsId[] = "@(#)deliver.c 2.4 01/08/81"; 10 11 /* 12 ** DELIVER -- Deliver a message to a particular address. 13 ** 14 ** Algorithm: 15 ** Compute receiving network (i.e., mailer), host, & user. 16 ** If local, see if this is really a program name. 17 ** Build argument for the mailer. 18 ** Create pipe through edit fcn if appropriate. 19 ** Fork. 20 ** Child: call mailer 21 ** Parent: call editfcn if specified. 22 ** Wait for mailer to finish. 23 ** Interpret exit status. 24 ** 25 ** Parameters: 26 ** to -- the address to deliver the message to. 27 ** editfcn -- if non-NULL, we want to call this function 28 ** to output the letter (instead of just out- 29 ** putting it raw). 30 ** 31 ** Returns: 32 ** zero -- successfully delivered. 33 ** else -- some failure, see ExitStat for more info. 34 ** 35 ** Side Effects: 36 ** The standard input is passed off to someone. 37 ** 38 ** WARNING: 39 ** The standard input is shared amongst all children, 40 ** including the file pointer. It is critical that the 41 ** parent waits for the child to finish before forking 42 ** another child. 43 ** 44 ** Called By: 45 ** main 46 ** savemail 47 ** 48 ** Files: 49 ** standard input -- must be opened to the message to 50 ** deliver. 51 */ 52 53 deliver(to, editfcn) 54 addrq *to; 55 int (*editfcn)(); 56 { 57 register struct mailer *m; 58 char *host; 59 char *user; 60 extern struct passwd *getpwnam(); 61 char **pvp; 62 extern char **buildargv(); 63 auto int st; 64 register int i; 65 register char *p; 66 int pid; 67 int pvect[2]; 68 extern FILE *fdopen(); 69 extern int errno; 70 FILE *mfile; 71 extern putheader(); 72 extern pipesig(); 73 extern bool GotHdr; 74 extern char *index(); 75 76 /* 77 ** Compute receiving mailer, host, and to addreses. 78 ** Do some initialization first. To is the to address 79 ** for error messages. 80 */ 81 82 To = to->q_paddr; 83 m = to->q_mailer; 84 user = to->q_user; 85 host = to->q_host; 86 Errors = 0; 87 errno = 0; 88 # ifdef DEBUG 89 if (Debug) 90 printf("deliver(%s [%d, `%s', `%s'])\n", To, m, host, user); 91 # endif DEBUG 92 93 /* 94 ** Remove quote bits from user/host. 95 */ 96 97 for (p = user; (*p++ &= 0177) != '\0'; ) 98 continue; 99 if (host != NULL) 100 for (p = host; (*p++ &= 0177) != '\0'; ) 101 continue; 102 103 /* 104 ** Strip quote bits from names if the mailer wants it. 105 */ 106 107 if (flagset(M_STRIPQ, m->m_flags)) 108 { 109 stripquotes(user); 110 stripquotes(host); 111 } 112 113 /* 114 ** See if this user name is "special". 115 ** If the user is a program, diddle with the mailer spec. 116 ** If the user name has a slash in it, assume that this 117 ** is a file -- send it off without further ado. 118 ** Note that this means that editfcn's will not 119 ** be applied to the message. 120 */ 121 122 if (m == &Mailer[0]) 123 { 124 if (*user == '|') 125 { 126 user++; 127 m = &Mailer[1]; 128 } 129 else 130 { 131 if (index(user, '/') != NULL) 132 { 133 i = mailfile(user); 134 giveresponse(i, TRUE, m); 135 return (i); 136 } 137 } 138 } 139 140 /* 141 ** See if the user exists. 142 ** Strictly, this is only needed to print a pretty 143 ** error message. 144 ** 145 ** >>>>>>>>>> This clause assumes that the local mailer 146 ** >> NOTE >> cannot do any further aliasing; that 147 ** >>>>>>>>>> function is subsumed by delivermail. 148 */ 149 150 if (m == &Mailer[0]) 151 { 152 if (getpwnam(user) == NULL) 153 { 154 giveresponse(EX_NOUSER, TRUE, m); 155 return (EX_NOUSER); 156 } 157 } 158 159 /* 160 ** If the mailer wants a From line, insert a new editfcn. 161 */ 162 163 if (flagset(M_HDR, m->m_flags) && editfcn == NULL && (!GotHdr || flagset(M_FHDR, m->m_flags))) 164 editfcn = putheader; 165 166 /* 167 ** Call the mailer. 168 ** The argument vector gets built, pipes through 'editfcn' 169 ** are created as necessary, and we fork & exec as 170 ** appropriate. In the parent, we call 'editfcn'. 171 */ 172 173 pvp = buildargv(m->m_argv, m->m_flags, host, user, From.q_paddr); 174 if (pvp == NULL) 175 { 176 usrerr("name too long"); 177 return (-1); 178 } 179 rewind(stdin); 180 181 /* create a pipe if we will need one */ 182 if (editfcn != NULL && pipe(pvect) < 0) 183 { 184 syserr("pipe"); 185 return (-1); 186 } 187 # ifdef VFORK 188 pid = vfork(); 189 # else 190 pid = fork(); 191 # endif 192 if (pid < 0) 193 { 194 syserr("Cannot fork"); 195 if (editfcn != NULL) 196 { 197 close(pvect[0]); 198 close(pvect[1]); 199 } 200 return (-1); 201 } 202 else if (pid == 0) 203 { 204 /* child -- set up input & exec mailer */ 205 /* make diagnostic output be standard output */ 206 close(2); 207 dup(1); 208 signal(SIGINT, SIG_IGN); 209 if (editfcn != NULL) 210 { 211 close(0); 212 if (dup(pvect[0]) < 0) 213 { 214 syserr("Cannot dup to zero!"); 215 _exit(EX_OSERR); 216 } 217 close(pvect[0]); 218 close(pvect[1]); 219 } 220 if (!flagset(M_RESTR, m->m_flags)) 221 setuid(getuid()); 222 # ifdef LOG 223 closelog(); 224 # endif LOG 225 # ifndef VFORK 226 /* 227 * We have to be careful with vfork - we can't mung up the 228 * memory but we don't want the mailer to inherit any extra 229 * open files. Chances are the mailer won't 230 * care about an extra file, but then again you never know. 231 * Actually, we would like to close(fileno(pwf)), but it's 232 * declared static so we can't. But if we fclose(pwf), which 233 * is what endpwent does, it closes it in the parent too and 234 * the next getpwnam will be slower. If you have a weird mailer 235 * that chokes on the extra file you should do the endpwent(). 236 */ 237 endpwent(); 238 # endif 239 execv(m->m_mailer, pvp); 240 /* syserr fails because log is closed */ 241 /* syserr("Cannot exec %s", m->m_mailer); */ 242 _exit(EX_UNAVAILABLE); 243 } 244 245 /* arrange to write out header message if error */ 246 if (editfcn != NULL) 247 { 248 close(pvect[0]); 249 signal(SIGPIPE, pipesig); 250 mfile = fdopen(pvect[1], "w"); 251 (*editfcn)(mfile); 252 fclose(mfile); 253 } 254 255 /* 256 ** Wait for child to die and report status. 257 ** We should never get fatal errors (e.g., segmentation 258 ** violation), so we report those specially. For other 259 ** errors, we choose a status message (into statmsg), 260 ** and if it represents an error, we print it. 261 */ 262 263 while ((i = wait(&st)) > 0 && i != pid) 264 continue; 265 if (i < 0) 266 { 267 syserr("wait"); 268 return (-1); 269 } 270 if ((st & 0377) != 0) 271 { 272 syserr("%s: stat %o", pvp[0], st); 273 ExitStat = EX_UNAVAILABLE; 274 return (-1); 275 } 276 i = (st >> 8) & 0377; 277 giveresponse(i, FALSE, m); 278 return (i); 279 } 280 /* 281 ** GIVERESPONSE -- Interpret an error response from a mailer 282 ** 283 ** Parameters: 284 ** stat -- the status code from the mailer (high byte 285 ** only; core dumps must have been taken care of 286 ** already). 287 ** force -- if set, force an error message output, even 288 ** if the mailer seems to like to print its own 289 ** messages. 290 ** m -- the mailer descriptor for this mailer. 291 ** 292 ** Returns: 293 ** none. 294 ** 295 ** Side Effects: 296 ** Errors may be incremented. 297 ** ExitStat may be set. 298 ** 299 ** Called By: 300 ** deliver 301 */ 302 303 giveresponse(stat, force, m) 304 int stat; 305 int force; 306 register struct mailer *m; 307 { 308 register char *statmsg; 309 extern char *SysExMsg[]; 310 register int i; 311 extern int N_SysEx; 312 extern long MsgSize; 313 char buf[30]; 314 315 i = stat - EX__BASE; 316 if (i < 0 || i > N_SysEx) 317 statmsg = NULL; 318 else 319 statmsg = SysExMsg[i]; 320 if (stat == 0) 321 statmsg = "ok"; 322 else 323 { 324 Errors++; 325 if (statmsg == NULL && m->m_badstat != 0) 326 { 327 stat = m->m_badstat; 328 i = stat - EX__BASE; 329 # ifdef DEBUG 330 if (i < 0 || i >= N_SysEx) 331 syserr("Bad m_badstat %d", stat); 332 else 333 # endif DEBUG 334 statmsg = SysExMsg[i]; 335 } 336 if (statmsg == NULL) 337 usrerr("unknown mailer response %d", stat); 338 else if (force || !flagset(M_QUIET, m->m_flags)) 339 usrerr("%s", statmsg); 340 } 341 342 /* 343 ** Final cleanup. 344 ** Log a record of the transaction. Compute the new 345 ** ExitStat -- if we already had an error, stick with 346 ** that. 347 */ 348 349 if (statmsg == NULL) 350 { 351 sprintf(buf, "error %d", stat); 352 statmsg = buf; 353 } 354 355 # ifdef LOG 356 logmsg(LOG_INFO, "%s->%s: %ld: %s", From.q_paddr, To, MsgSize, statmsg); 357 # endif LOG 358 setstat(stat); 359 return (stat); 360 } 361 /* 362 ** PUTHEADER -- insert the From header into some mail 363 ** 364 ** For mailers such as 'msgs' that want the header inserted 365 ** into the mail, this edit filter inserts the From line and 366 ** then passes the rest of the message through. 367 ** 368 ** Parameters: 369 ** fp -- the file pointer for the output. 370 ** 371 ** Returns: 372 ** none 373 ** 374 ** Side Effects: 375 ** Puts a "From" line in UNIX format, and then 376 ** outputs the rest of the message. 377 ** 378 ** Called By: 379 ** deliver 380 */ 381 382 putheader(fp) 383 register FILE *fp; 384 { 385 char buf[MAXLINE + 1]; 386 long tim; 387 extern char *ctime(); 388 register char *p; 389 extern char *index(); 390 391 /* output the header part */ 392 fgets(buf, sizeof buf, stdin); 393 if (strncmp(buf, "From ", 5) != 0 || (p = index(&buf[5], ' ')) == NULL) 394 { 395 time(&tim); 396 fprintf(fp, "From %s %s", From.q_paddr, ctime(&tim)); 397 fputs(buf, fp); 398 } 399 else 400 fprintf(fp, "From %s %s", From.q_paddr, &p[1]); 401 402 /* output the body */ 403 while (!ferror(fp) && fgets(buf, sizeof buf, stdin) != NULL) 404 fputs(buf, fp); 405 if (ferror(fp)) 406 { 407 syserr("putheader: write error"); 408 setstat(EX_IOERR); 409 } 410 } 411 /* 412 ** PIPESIG -- Handle broken pipe signals 413 ** 414 ** This just logs an error. 415 ** 416 ** Parameters: 417 ** none 418 ** 419 ** Returns: 420 ** none 421 ** 422 ** Side Effects: 423 ** logs an error message. 424 */ 425 426 pipesig() 427 { 428 syserr("Broken pipe"); 429 signal(SIGPIPE, SIG_IGN); 430 } 431 /* 432 ** SENDTO -- Designate a send list. 433 ** 434 ** The parameter is a comma-separated list of people to send to. 435 ** This routine arranges to send to all of them. 436 ** 437 ** Parameters: 438 ** list -- the send list. 439 ** copyf -- the copy flag; passed to parse. 440 ** 441 ** Returns: 442 ** none 443 ** 444 ** Side Effects: 445 ** none. 446 ** 447 ** Called By: 448 ** main 449 ** alias 450 */ 451 452 sendto(list, copyf) 453 char *list; 454 int copyf; 455 { 456 register char *p; 457 register char *q; 458 register char c; 459 addrq *a; 460 extern addrq *parse(); 461 bool more; 462 463 /* more keeps track of what the previous delimiter was */ 464 more = TRUE; 465 for (p = list; more; ) 466 { 467 /* find the end of this address */ 468 q = p; 469 while ((c = *p++) != '\0' && c != ',' && c != '\n') 470 continue; 471 more = c != '\0'; 472 *--p = '\0'; 473 if (more) 474 p++; 475 476 /* parse the address */ 477 if ((a = parse(q, (addrq *) NULL, copyf)) == NULL) 478 continue; 479 480 /* arrange to send to this person */ 481 recipient(a, &SendQ); 482 } 483 To = NULL; 484 } 485 /* 486 ** RECIPIENT -- Designate a message recipient 487 ** 488 ** Saves the named person for future mailing. 489 ** 490 ** Designates a person as a recipient. This routine 491 ** does the initial parsing, and checks to see if 492 ** this person has already received the mail. 493 ** It also supresses local network names and turns them into 494 ** local names. 495 ** 496 ** Parameters: 497 ** a -- the (preparsed) address header for the recipient. 498 ** targetq -- the queue to add the name to. 499 ** 500 ** Returns: 501 ** none. 502 ** 503 ** Side Effects: 504 ** none. 505 ** 506 ** Called By: 507 ** sendto 508 ** main 509 */ 510 511 recipient(a, targetq) 512 register addrq *a; 513 addrq *targetq; 514 { 515 register addrq *q; 516 register struct mailer *m; 517 register char **pvp; 518 extern char *xalloc(); 519 extern bool forward(); 520 extern int errno; 521 extern bool sameaddr(); 522 523 To = a->q_paddr; 524 m = a->q_mailer; 525 errno = 0; 526 # ifdef DEBUG 527 if (Debug) 528 printf("recipient(%s)\n", To); 529 # endif DEBUG 530 531 /* 532 ** Look up this person in the recipient list. If they 533 ** are there already, return, otherwise continue. 534 */ 535 536 if (!ForceMail) 537 { 538 for (q = &SendQ; (q = nxtinq(q)) != NULL; ) 539 if (sameaddr(q, a, FALSE)) 540 { 541 # ifdef DEBUG 542 if (Debug) 543 printf("(%s in SendQ)\n", a->q_paddr); 544 # endif DEBUG 545 return; 546 } 547 for (q = &AliasQ; (q = nxtinq(q)) != NULL; ) 548 if (sameaddr(q, a, FALSE)) 549 { 550 # ifdef DEBUG 551 if (Debug) 552 printf("(%s in AliasQ)\n", a->q_paddr); 553 # endif DEBUG 554 return; 555 } 556 } 557 558 /* 559 ** See if the user wants hir mail forwarded. 560 ** `Forward' must do the forwarding recursively. 561 */ 562 563 if (m == &Mailer[0] && !NoAlias && targetq == &SendQ && forward(a)) 564 return; 565 566 /* 567 ** Put the user onto the target queue. 568 */ 569 570 if (targetq != NULL) 571 { 572 putonq(a, targetq); 573 } 574 575 return; 576 } 577 /* 578 ** BUILDARGV -- Build an argument vector for a mail server. 579 ** 580 ** Using a template defined in config.c, an argv is built. 581 ** The format of the template is already a vector. The 582 ** items of this vector are copied, unless a dollar sign 583 ** is encountered. In this case, the next character 584 ** specifies something else to copy in. These can be 585 ** $f The from address. 586 ** $h The host. 587 ** $u The user. 588 ** $c The hop count. 589 ** The vector is built in a local buffer. A pointer to 590 ** the static argv is returned. 591 ** 592 ** Parameters: 593 ** tmplt -- a template for an argument vector. 594 ** flags -- the flags for this server. 595 ** host -- the host name to send to. 596 ** user -- the user name to send to. 597 ** from -- the person this mail is from. 598 ** 599 ** Returns: 600 ** A pointer to an argv. 601 ** 602 ** Side Effects: 603 ** none 604 ** 605 ** WARNING: 606 ** Since the argv is staticly allocated, any subsequent 607 ** calls will clobber the old argv. 608 ** 609 ** Called By: 610 ** deliver 611 */ 612 613 char ** 614 buildargv(tmplt, flags, host, user, from) 615 char **tmplt; 616 int flags; 617 char *host; 618 char *user; 619 char *from; 620 { 621 register char *p; 622 register char *q; 623 static char *pv[MAXPV+1]; 624 char **pvp; 625 char **mvp; 626 static char buf[512]; 627 register char *bp; 628 char pbuf[30]; 629 630 /* 631 ** Do initial argv setup. 632 ** Insert the mailer name. Notice that $x expansion is 633 ** NOT done on the mailer name. Then, if the mailer has 634 ** a picky -f flag, we insert it as appropriate. This 635 ** code does not check for 'pv' overflow; this places a 636 ** manifest lower limit of 4 for MAXPV. 637 */ 638 639 pvp = pv; 640 bp = buf; 641 642 *pvp++ = tmplt[0]; 643 644 /* insert -f or -r flag as appropriate */ 645 if (flagset(M_FOPT|M_ROPT, flags) && FromFlag) 646 { 647 if (flagset(M_FOPT, flags)) 648 *pvp++ = "-f"; 649 else 650 *pvp++ = "-r"; 651 *pvp++ = From.q_paddr; 652 } 653 654 /* 655 ** Build the rest of argv. 656 ** For each prototype parameter, the prototype is 657 ** scanned character at a time. If a dollar-sign is 658 ** found, 'q' is set to the appropriate expansion, 659 ** otherwise it is null. Then either the string 660 ** pointed to by q, or the original character, is 661 ** interpolated into the buffer. Buffer overflow is 662 ** checked. 663 */ 664 665 for (mvp = tmplt; (p = *++mvp) != NULL; ) 666 { 667 if (pvp >= &pv[MAXPV]) 668 { 669 syserr("Too many parameters to %s", pv[0]); 670 return (NULL); 671 } 672 *pvp++ = bp; 673 for (; *p != '\0'; p++) 674 { 675 /* q will be the interpolated quantity */ 676 q = NULL; 677 if (*p == '$') 678 { 679 switch (*++p) 680 { 681 case 'f': /* from person */ 682 q = from; 683 break; 684 685 case 'u': /* user */ 686 q = user; 687 break; 688 689 case 'h': /* host */ 690 q = host; 691 break; 692 693 case 'c': /* hop count */ 694 sprintf(pbuf, "%d", HopCount); 695 q = pbuf; 696 break; 697 } 698 } 699 700 /* 701 ** Interpolate q or output one character 702 ** Strip quote bits as we proceed..... 703 */ 704 705 if (q != NULL) 706 { 707 while (bp < &buf[sizeof buf - 1] && (*bp++ = *q++) != '\0') 708 continue; 709 bp--; 710 } 711 else if (bp < &buf[sizeof buf - 1]) 712 *bp++ = *p; 713 } 714 *bp++ = '\0'; 715 if (bp >= &buf[sizeof buf - 1]) 716 return (NULL); 717 } 718 *pvp = NULL; 719 720 # ifdef DEBUG 721 if (Debug) 722 { 723 printf("Interpolated argv is:\n"); 724 for (mvp = pv; *mvp != NULL; mvp++) 725 printf("\t%s\n", *mvp); 726 } 727 # endif DEBUG 728 729 return (pv); 730 } 731 /* 732 ** MAILFILE -- Send a message to a file. 733 ** 734 ** Parameters: 735 ** filename -- the name of the file to send to. 736 ** 737 ** Returns: 738 ** The exit code associated with the operation. 739 ** 740 ** Side Effects: 741 ** none. 742 ** 743 ** Called By: 744 ** deliver 745 */ 746 747 mailfile(filename) 748 char *filename; 749 { 750 char buf[MAXLINE]; 751 register FILE *f; 752 auto long tim; 753 extern char *ctime(); 754 755 f = fopen(filename, "a"); 756 if (f == NULL) 757 return (EX_CANTCREAT); 758 759 /* output the timestamp */ 760 time(&tim); 761 fprintf(f, "From %s %s", From.q_paddr, ctime(&tim)); 762 rewind(stdin); 763 while (fgets(buf, sizeof buf, stdin) != NULL) 764 { 765 fputs(buf, f); 766 if (ferror(f)) 767 { 768 fclose(f); 769 return (EX_IOERR); 770 } 771 } 772 fputs("\n", f); 773 fclose(f); 774 return (EX_OK); 775 } 776