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 2.1 11/05/80"; 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 74 /* 75 ** Compute receiving mailer, host, and to addreses. 76 ** Do some initialization first. To is the to address 77 ** for error messages. 78 */ 79 80 To = to->q_paddr; 81 m = to->q_mailer; 82 user = to->q_user; 83 host = to->q_host; 84 Errors = 0; 85 errno = 0; 86 # ifdef DEBUG 87 if (Debug) 88 printf("deliver(%s [%d, `%s', `%s'])\n", To, m, host, user); 89 # endif DEBUG 90 91 /* 92 ** Remove quote bits from user/host. 93 */ 94 95 for (p = user; (*p++ &= 0177) != '\0'; ) 96 continue; 97 if (host != NULL) 98 for (p = host; (*p++ &= 0177) != '\0'; ) 99 continue; 100 101 /* 102 ** Strip quote bits from names if the mailer wants it. 103 */ 104 105 if (flagset(M_STRIPQ, m->m_flags)) 106 { 107 stripquotes(user); 108 stripquotes(host); 109 } 110 111 /* 112 ** See if this user name is "special". 113 ** If the user is a program, diddle with the mailer spec. 114 ** If the user name has a slash in it, assume that this 115 ** is a file -- send it off without further ado. 116 ** Note that this means that editfcn's will not 117 ** be applied to the message. 118 */ 119 120 if (m == &Mailer[0]) 121 { 122 if (*user == '|') 123 { 124 user++; 125 m = &Mailer[1]; 126 } 127 else 128 { 129 if (index(user, '/') != NULL) 130 { 131 i = mailfile(user); 132 giveresponse(i, TRUE, m); 133 return (i); 134 } 135 } 136 } 137 138 /* 139 ** See if the user exists. 140 ** Strictly, this is only needed to print a pretty 141 ** error message. 142 ** 143 ** >>>>>>>>>> This clause assumes that the local mailer 144 ** >> NOTE >> cannot do any further aliasing; that 145 ** >>>>>>>>>> function is subsumed by delivermail. 146 */ 147 148 if (m == &Mailer[0]) 149 { 150 if (getpwnam(user) == NULL) 151 { 152 giveresponse(EX_NOUSER, TRUE, m); 153 return (EX_NOUSER); 154 } 155 } 156 157 /* 158 ** If the mailer wants a From line, insert a new editfcn. 159 */ 160 161 if (flagset(M_HDR, m->m_flags) && editfcn == NULL) 162 editfcn = putheader; 163 164 /* 165 ** Call the mailer. 166 ** The argument vector gets built, pipes through 'editfcn' 167 ** are created as necessary, and we fork & exec as 168 ** appropriate. In the parent, we call 'editfcn'. 169 */ 170 171 pvp = buildargv(m->m_argv, m->m_flags, host, user, From.q_paddr); 172 if (pvp == NULL) 173 { 174 usrerr("name too long"); 175 return (-1); 176 } 177 rewind(stdin); 178 179 /* create a pipe if we will need one */ 180 if (editfcn != NULL && pipe(pvect) < 0) 181 { 182 syserr("pipe"); 183 return (-1); 184 } 185 # ifdef VFORK 186 pid = vfork(); 187 # else 188 pid = fork(); 189 # endif 190 if (pid < 0) 191 { 192 syserr("Cannot fork"); 193 if (editfcn != NULL) 194 { 195 close(pvect[0]); 196 close(pvect[1]); 197 } 198 return (-1); 199 } 200 else if (pid == 0) 201 { 202 /* child -- set up input & exec mailer */ 203 /* make diagnostic output be standard output */ 204 close(2); 205 dup(1); 206 signal(SIGINT, SIG_IGN); 207 if (editfcn != NULL) 208 { 209 close(0); 210 if (dup(pvect[0]) < 0) 211 { 212 syserr("Cannot dup to zero!"); 213 _exit(EX_OSERR); 214 } 215 close(pvect[0]); 216 close(pvect[1]); 217 } 218 if (!flagset(M_RESTR, m->m_flags)) 219 setuid(getuid()); 220 # ifdef LOG 221 initlog(NULL, 0, LOG_CLOSE); 222 # endif LOG 223 # ifndef VFORK 224 /* 225 * We have to be careful with vfork - we can't mung up the 226 * memory but we don't want the mailer to inherit any extra 227 * open files. Chances are the mailer won't 228 * care about an extra file, but then again you never know. 229 * Actually, we would like to close(fileno(pwf)), but it's 230 * declared static so we can't. But if we fclose(pwf), which 231 * is what endpwent does, it closes it in the parent too and 232 * the next getpwnam will be slower. If you have a weird mailer 233 * that chokes on the extra file you should do the endpwent(). 234 */ 235 endpwent(); 236 # endif 237 execv(m->m_mailer, pvp); 238 /* syserr fails because log is closed */ 239 /* syserr("Cannot exec %s", m->m_mailer); */ 240 _exit(EX_UNAVAILABLE); 241 } 242 243 /* arrange to write out header message if error */ 244 if (editfcn != NULL) 245 { 246 close(pvect[0]); 247 signal(SIGPIPE, pipesig); 248 mfile = fdopen(pvect[1], "w"); 249 (*editfcn)(mfile); 250 fclose(mfile); 251 } 252 253 /* 254 ** Wait for child to die and report status. 255 ** We should never get fatal errors (e.g., segmentation 256 ** violation), so we report those specially. For other 257 ** errors, we choose a status message (into statmsg), 258 ** and if it represents an error, we print it. 259 */ 260 261 while ((i = wait(&st)) > 0 && i != pid) 262 continue; 263 if (i < 0) 264 { 265 syserr("wait"); 266 return (-1); 267 } 268 if ((st & 0377) != 0) 269 { 270 syserr("%s: stat %o", pvp[0], st); 271 ExitStat = EX_UNAVAILABLE; 272 return (-1); 273 } 274 i = (st >> 8) & 0377; 275 giveresponse(i, FALSE, m); 276 return (i); 277 } 278 /* 279 ** GIVERESPONSE -- Interpret an error response from a mailer 280 ** 281 ** Parameters: 282 ** stat -- the status code from the mailer (high byte 283 ** only; core dumps must have been taken care of 284 ** already). 285 ** force -- if set, force an error message output, even 286 ** if the mailer seems to like to print its own 287 ** messages. 288 ** m -- the mailer descriptor for this mailer. 289 ** 290 ** Returns: 291 ** none. 292 ** 293 ** Side Effects: 294 ** Errors may be incremented. 295 ** ExitStat may be set. 296 ** 297 ** Called By: 298 ** deliver 299 */ 300 301 giveresponse(stat, force, m) 302 int stat; 303 int force; 304 register struct mailer *m; 305 { 306 register char *statmsg; 307 extern char *SysExMsg[]; 308 register int i; 309 extern int N_SysEx; 310 extern long MsgSize; 311 char buf[30]; 312 313 i = stat - EX__BASE; 314 if (i < 0 || i > N_SysEx) 315 statmsg = NULL; 316 else 317 statmsg = SysExMsg[i]; 318 if (stat == 0) 319 statmsg = "ok"; 320 else 321 { 322 Errors++; 323 if (statmsg == NULL && m->m_badstat != 0) 324 { 325 stat = m->m_badstat; 326 i = stat - EX__BASE; 327 # ifdef DEBUG 328 if (i < 0 || i >= N_SysEx) 329 syserr("Bad m_badstat %d", stat); 330 else 331 # endif DEBUG 332 statmsg = SysExMsg[i]; 333 } 334 if (statmsg == NULL) 335 usrerr("unknown mailer response %d", stat); 336 else if (force || !flagset(M_QUIET, m->m_flags)) 337 usrerr("%s", statmsg); 338 } 339 340 /* 341 ** Final cleanup. 342 ** Log a record of the transaction. Compute the new 343 ** ExitStat -- if we already had an error, stick with 344 ** that. 345 */ 346 347 if (statmsg == NULL) 348 { 349 sprintf(buf, "error %d", stat); 350 statmsg = buf; 351 } 352 353 # ifdef LOG 354 logmsg(LOG_INFO, "%s->%s: %ld: %s", From.q_paddr, To, MsgSize, statmsg); 355 # endif LOG 356 setstat(stat); 357 return (stat); 358 } 359 /* 360 ** PUTHEADER -- insert the From header into some mail 361 ** 362 ** For mailers such as 'msgs' that want the header inserted 363 ** into the mail, this edit filter inserts the From line and 364 ** then passes the rest of the message through. 365 ** 366 ** Parameters: 367 ** fp -- the file pointer for the output. 368 ** 369 ** Returns: 370 ** none 371 ** 372 ** Side Effects: 373 ** Puts a "From" line in UNIX format, and then 374 ** outputs the rest of the message. 375 ** 376 ** Called By: 377 ** deliver 378 */ 379 380 putheader(fp) 381 register FILE *fp; 382 { 383 char buf[MAXLINE + 1]; 384 long tim; 385 extern char *ctime(); 386 387 time(&tim); 388 fprintf(fp, "From %s %s", From.q_paddr, ctime(&tim)); 389 while (fgets(buf, sizeof buf, stdin) != NULL && !ferror(fp)) 390 fputs(buf, fp); 391 if (ferror(fp)) 392 { 393 syserr("putheader: write error"); 394 setstat(EX_IOERR); 395 } 396 } 397 /* 398 ** PIPESIG -- Handle broken pipe signals 399 ** 400 ** This just logs an error. 401 ** 402 ** Parameters: 403 ** none 404 ** 405 ** Returns: 406 ** none 407 ** 408 ** Side Effects: 409 ** logs an error message. 410 */ 411 412 pipesig() 413 { 414 syserr("Broken pipe"); 415 signal(SIGPIPE, SIG_IGN); 416 } 417 /* 418 ** SENDTO -- Designate a send list. 419 ** 420 ** The parameter is a comma-separated list of people to send to. 421 ** This routine arranges to send to all of them. 422 ** 423 ** Parameters: 424 ** list -- the send list. 425 ** copyf -- the copy flag; passed to parse. 426 ** 427 ** Returns: 428 ** none 429 ** 430 ** Side Effects: 431 ** none. 432 ** 433 ** Called By: 434 ** main 435 ** alias 436 */ 437 438 sendto(list, copyf) 439 char *list; 440 int copyf; 441 { 442 register char *p; 443 register char *q; 444 register char c; 445 addrq *a; 446 extern addrq *parse(); 447 bool more; 448 449 /* more keeps track of what the previous delimiter was */ 450 more = TRUE; 451 for (p = list; more; ) 452 { 453 /* find the end of this address */ 454 q = p; 455 while ((c = *p++) != '\0' && c != ',' && c != '\n') 456 continue; 457 more = c != '\0'; 458 *--p = '\0'; 459 if (more) 460 p++; 461 462 /* parse the address */ 463 if ((a = parse(q, (addrq *) NULL, copyf)) == NULL) 464 continue; 465 466 /* arrange to send to this person */ 467 recipient(a, &SendQ); 468 } 469 To = NULL; 470 } 471 /* 472 ** RECIPIENT -- Designate a message recipient 473 ** 474 ** Saves the named person for future mailing. 475 ** 476 ** Designates a person as a recipient. This routine 477 ** does the initial parsing, and checks to see if 478 ** this person has already received the mail. 479 ** It also supresses local network names and turns them into 480 ** local names. 481 ** 482 ** Parameters: 483 ** a -- the (preparsed) address header for the recipient. 484 ** targetq -- the queue to add the name to. 485 ** 486 ** Returns: 487 ** none. 488 ** 489 ** Side Effects: 490 ** none. 491 ** 492 ** Called By: 493 ** sendto 494 ** main 495 */ 496 497 recipient(a, targetq) 498 register addrq *a; 499 addrq *targetq; 500 { 501 register addrq *q; 502 register struct mailer *m; 503 register char **pvp; 504 extern char *xalloc(); 505 extern bool forward(); 506 extern int errno; 507 extern bool sameaddr(); 508 509 To = a->q_paddr; 510 m = a->q_mailer; 511 errno = 0; 512 # ifdef DEBUG 513 if (Debug) 514 printf("recipient(%s)\n", To); 515 # endif DEBUG 516 517 /* 518 ** Look up this person in the recipient list. If they 519 ** are there already, return, otherwise continue. 520 */ 521 522 if (!ForceMail) 523 { 524 for (q = &SendQ; (q = nxtinq(q)) != NULL; ) 525 if (sameaddr(q, a, FALSE)) 526 { 527 # ifdef DEBUG 528 if (Debug) 529 printf("(%s in SendQ)\n", a->q_paddr); 530 # endif DEBUG 531 return; 532 } 533 for (q = &AliasQ; (q = nxtinq(q)) != NULL; ) 534 if (sameaddr(q, a, FALSE)) 535 { 536 # ifdef DEBUG 537 if (Debug) 538 printf("(%s in AliasQ)\n", a->q_paddr); 539 # endif DEBUG 540 return; 541 } 542 } 543 544 /* 545 ** See if the user wants hir mail forwarded. 546 ** `Forward' must do the forwarding recursively. 547 */ 548 549 if (m == &Mailer[0] && !NoAlias && targetq == &SendQ && forward(a)) 550 return; 551 552 /* 553 ** Put the user onto the target queue. 554 */ 555 556 if (targetq != NULL) 557 { 558 putonq(a, targetq); 559 } 560 561 return; 562 } 563 /* 564 ** BUILDARGV -- Build an argument vector for a mail server. 565 ** 566 ** Using a template defined in config.c, an argv is built. 567 ** The format of the template is already a vector. The 568 ** items of this vector are copied, unless a dollar sign 569 ** is encountered. In this case, the next character 570 ** specifies something else to copy in. These can be 571 ** $f The from address. 572 ** $h The host. 573 ** $u The user. 574 ** $c The hop count. 575 ** The vector is built in a local buffer. A pointer to 576 ** the static argv is returned. 577 ** 578 ** Parameters: 579 ** tmplt -- a template for an argument vector. 580 ** flags -- the flags for this server. 581 ** host -- the host name to send to. 582 ** user -- the user name to send to. 583 ** from -- the person this mail is from. 584 ** 585 ** Returns: 586 ** A pointer to an argv. 587 ** 588 ** Side Effects: 589 ** none 590 ** 591 ** WARNING: 592 ** Since the argv is staticly allocated, any subsequent 593 ** calls will clobber the old argv. 594 ** 595 ** Called By: 596 ** deliver 597 */ 598 599 char ** 600 buildargv(tmplt, flags, host, user, from) 601 char **tmplt; 602 int flags; 603 char *host; 604 char *user; 605 char *from; 606 { 607 register char *p; 608 register char *q; 609 static char *pv[MAXPV+1]; 610 char **pvp; 611 char **mvp; 612 static char buf[512]; 613 register char *bp; 614 char pbuf[30]; 615 616 /* 617 ** Do initial argv setup. 618 ** Insert the mailer name. Notice that $x expansion is 619 ** NOT done on the mailer name. Then, if the mailer has 620 ** a picky -f flag, we insert it as appropriate. This 621 ** code does not check for 'pv' overflow; this places a 622 ** manifest lower limit of 4 for MAXPV. 623 */ 624 625 pvp = pv; 626 bp = buf; 627 628 *pvp++ = tmplt[0]; 629 630 /* insert -f or -r flag as appropriate */ 631 if (flagset(M_FOPT|M_ROPT, flags) && FromFlag) 632 { 633 if (flagset(M_FOPT, flags)) 634 *pvp++ = "-f"; 635 else 636 *pvp++ = "-r"; 637 *pvp++ = From.q_paddr; 638 } 639 640 /* 641 ** Build the rest of argv. 642 ** For each prototype parameter, the prototype is 643 ** scanned character at a time. If a dollar-sign is 644 ** found, 'q' is set to the appropriate expansion, 645 ** otherwise it is null. Then either the string 646 ** pointed to by q, or the original character, is 647 ** interpolated into the buffer. Buffer overflow is 648 ** checked. 649 */ 650 651 for (mvp = tmplt; (p = *++mvp) != NULL; ) 652 { 653 if (pvp >= &pv[MAXPV]) 654 { 655 syserr("Too many parameters to %s", pv[0]); 656 return (NULL); 657 } 658 *pvp++ = bp; 659 for (; *p != '\0'; p++) 660 { 661 /* q will be the interpolated quantity */ 662 q = NULL; 663 if (*p == '$') 664 { 665 switch (*++p) 666 { 667 case 'f': /* from person */ 668 q = from; 669 break; 670 671 case 'u': /* user */ 672 q = user; 673 break; 674 675 case 'h': /* host */ 676 q = host; 677 break; 678 679 case 'c': /* hop count */ 680 sprintf(pbuf, "%d", HopCount); 681 q = pbuf; 682 break; 683 } 684 } 685 686 /* 687 ** Interpolate q or output one character 688 ** Strip quote bits as we proceed..... 689 */ 690 691 if (q != NULL) 692 { 693 while (bp < &buf[sizeof buf - 1] && (*bp++ = *q++) != '\0') 694 continue; 695 bp--; 696 } 697 else if (bp < &buf[sizeof buf - 1]) 698 *bp++ = *p; 699 } 700 *bp++ = '\0'; 701 if (bp >= &buf[sizeof buf - 1]) 702 return (NULL); 703 } 704 *pvp = NULL; 705 706 # ifdef DEBUG 707 if (Debug) 708 { 709 printf("Interpolated argv is:\n"); 710 for (mvp = pv; *mvp != NULL; mvp++) 711 printf("\t%s\n", *mvp); 712 } 713 # endif DEBUG 714 715 return (pv); 716 } 717 /* 718 ** MAILFILE -- Send a message to a file. 719 ** 720 ** Parameters: 721 ** filename -- the name of the file to send to. 722 ** 723 ** Returns: 724 ** The exit code associated with the operation. 725 ** 726 ** Side Effects: 727 ** none. 728 ** 729 ** Called By: 730 ** deliver 731 */ 732 733 mailfile(filename) 734 char *filename; 735 { 736 char buf[MAXLINE]; 737 register FILE *f; 738 auto long tim; 739 extern char *ctime(); 740 741 f = fopen(filename, "a"); 742 if (f == NULL) 743 return (EX_CANTCREAT); 744 745 /* output the timestamp */ 746 time(&tim); 747 fprintf(f, "From %s %s", From.q_paddr, ctime(&tim)); 748 rewind(stdin); 749 while (fgets(buf, sizeof buf, stdin) != NULL) 750 { 751 fputs(buf, f); 752 if (ferror(f)) 753 { 754 fclose(f); 755 return (EX_IOERR); 756 } 757 } 758 fputs("\n", f); 759 fclose(f); 760 return (EX_OK); 761 } 762