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 1.10 10/27/80"; 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; 310 311 i = stat - EX__BASE; 312 if (i < 0 || i > N_SysEx) 313 statmsg = NULL; 314 else 315 statmsg = SysExMsg[i]; 316 if (stat == 0) 317 statmsg = "ok"; 318 else 319 { 320 Errors++; 321 if (statmsg == NULL && m->m_badstat != 0) 322 { 323 stat = m->m_badstat; 324 i = stat - EX__BASE; 325 # ifdef DEBUG 326 if (i < 0 || i >= N_SysEx) 327 syserr("Bad m_badstat %d", stat); 328 else 329 # endif DEBUG 330 statmsg = SysExMsg[i]; 331 } 332 if (statmsg == NULL) 333 usrerr("unknown mailer response %d", stat); 334 else if (force || !flagset(M_QUIET, m->m_flags)) 335 usrerr("%s", statmsg); 336 } 337 338 /* 339 ** Final cleanup. 340 ** Log a record of the transaction. Compute the new 341 ** ExitStat -- if we already had an error, stick with 342 ** that. 343 */ 344 345 # ifdef LOG 346 if (statmsg == NULL) 347 logmsg(LOG_INFO, "%s->%s: error %d", From.q_paddr, To, stat); 348 else 349 logmsg(LOG_INFO, "%s->%s: %s", From.q_paddr, To, statmsg); 350 # endif LOG 351 setstat(stat); 352 return (stat); 353 } 354 /* 355 ** PUTHEADER -- insert the From header into some mail 356 ** 357 ** For mailers such as 'msgs' that want the header inserted 358 ** into the mail, this edit filter inserts the From line and 359 ** then passes the rest of the message through. 360 ** 361 ** Parameters: 362 ** fp -- the file pointer for the output. 363 ** 364 ** Returns: 365 ** none 366 ** 367 ** Side Effects: 368 ** Puts a "From" line in UNIX format, and then 369 ** outputs the rest of the message. 370 ** 371 ** Called By: 372 ** deliver 373 */ 374 375 putheader(fp) 376 register FILE *fp; 377 { 378 char buf[MAXLINE + 1]; 379 long tim; 380 extern char *ctime(); 381 382 time(&tim); 383 fprintf(fp, "From %s %s", From.q_paddr, ctime(&tim)); 384 while (fgets(buf, sizeof buf, stdin) != NULL && !ferror(fp)) 385 fputs(buf, fp); 386 if (ferror(fp)) 387 { 388 syserr("putheader: write error"); 389 setstat(EX_IOERR); 390 } 391 } 392 /* 393 ** PIPESIG -- Handle broken pipe signals 394 ** 395 ** This just logs an error. 396 ** 397 ** Parameters: 398 ** none 399 ** 400 ** Returns: 401 ** none 402 ** 403 ** Side Effects: 404 ** logs an error message. 405 */ 406 407 pipesig() 408 { 409 syserr("Broken pipe"); 410 signal(SIGPIPE, SIG_IGN); 411 } 412 /* 413 ** SENDTO -- Designate a send list. 414 ** 415 ** The parameter is a comma-separated list of people to send to. 416 ** This routine arranges to send to all of them. 417 ** 418 ** Parameters: 419 ** list -- the send list. 420 ** copyf -- the copy flag; passed to parse. 421 ** 422 ** Returns: 423 ** none 424 ** 425 ** Side Effects: 426 ** none. 427 ** 428 ** Called By: 429 ** main 430 ** alias 431 */ 432 433 sendto(list, copyf) 434 char *list; 435 int copyf; 436 { 437 register char *p; 438 register char *q; 439 register char c; 440 addrq *a; 441 extern addrq *parse(); 442 bool more; 443 444 /* more keeps track of what the previous delimiter was */ 445 more = TRUE; 446 for (p = list; more; ) 447 { 448 /* find the end of this address */ 449 q = p; 450 while ((c = *p++) != '\0' && c != ',' && c != '\n') 451 continue; 452 more = c != '\0'; 453 *--p = '\0'; 454 if (more) 455 p++; 456 457 /* parse the address */ 458 if ((a = parse(q, (addrq *) NULL, copyf)) == NULL) 459 continue; 460 461 /* arrange to send to this person */ 462 recipient(a, &SendQ); 463 } 464 To = NULL; 465 } 466 /* 467 ** RECIPIENT -- Designate a message recipient 468 ** 469 ** Saves the named person for future mailing. 470 ** 471 ** Designates a person as a recipient. This routine 472 ** does the initial parsing, and checks to see if 473 ** this person has already received the mail. 474 ** It also supresses local network names and turns them into 475 ** local names. 476 ** 477 ** Parameters: 478 ** a -- the (preparsed) address header for the recipient. 479 ** targetq -- the queue to add the name to. 480 ** 481 ** Returns: 482 ** none. 483 ** 484 ** Side Effects: 485 ** none. 486 ** 487 ** Called By: 488 ** sendto 489 ** main 490 */ 491 492 recipient(a, targetq) 493 register addrq *a; 494 addrq *targetq; 495 { 496 register addrq *q; 497 register struct mailer *m; 498 register char **pvp; 499 extern char *xalloc(); 500 extern bool forward(); 501 extern int errno; 502 extern bool sameaddr(); 503 504 To = a->q_paddr; 505 m = a->q_mailer; 506 errno = 0; 507 # ifdef DEBUG 508 if (Debug) 509 printf("recipient(%s)\n", To); 510 # endif DEBUG 511 512 /* 513 ** Look up this person in the recipient list. If they 514 ** are there already, return, otherwise continue. 515 */ 516 517 if (!ForceMail) 518 { 519 for (q = &SendQ; (q = nxtinq(q)) != NULL; ) 520 if (sameaddr(q, a, FALSE)) 521 { 522 # ifdef DEBUG 523 if (Debug) 524 printf("(%s in SendQ)\n", a->q_paddr); 525 # endif DEBUG 526 return; 527 } 528 for (q = &AliasQ; (q = nxtinq(q)) != NULL; ) 529 if (sameaddr(q, a, FALSE)) 530 { 531 # ifdef DEBUG 532 if (Debug) 533 printf("(%s in AliasQ)\n", a->q_paddr); 534 # endif DEBUG 535 return; 536 } 537 } 538 539 /* 540 ** See if the user wants hir mail forwarded. 541 ** `Forward' must do the forwarding recursively. 542 */ 543 544 if (m == &Mailer[0] && !NoAlias && targetq == &SendQ && forward(a)) 545 return; 546 547 /* 548 ** Put the user onto the target queue. 549 */ 550 551 if (targetq != NULL) 552 { 553 putonq(a, targetq); 554 } 555 556 return; 557 } 558 /* 559 ** BUILDARGV -- Build an argument vector for a mail server. 560 ** 561 ** Using a template defined in config.c, an argv is built. 562 ** The format of the template is already a vector. The 563 ** items of this vector are copied, unless a dollar sign 564 ** is encountered. In this case, the next character 565 ** specifies something else to copy in. These can be 566 ** $f The from address. 567 ** $h The host. 568 ** $u The user. 569 ** $c The hop count. 570 ** The vector is built in a local buffer. A pointer to 571 ** the static argv is returned. 572 ** 573 ** Parameters: 574 ** tmplt -- a template for an argument vector. 575 ** flags -- the flags for this server. 576 ** host -- the host name to send to. 577 ** user -- the user name to send to. 578 ** from -- the person this mail is from. 579 ** 580 ** Returns: 581 ** A pointer to an argv. 582 ** 583 ** Side Effects: 584 ** none 585 ** 586 ** WARNING: 587 ** Since the argv is staticly allocated, any subsequent 588 ** calls will clobber the old argv. 589 ** 590 ** Called By: 591 ** deliver 592 */ 593 594 char ** 595 buildargv(tmplt, flags, host, user, from) 596 char **tmplt; 597 int flags; 598 char *host; 599 char *user; 600 char *from; 601 { 602 register char *p; 603 register char *q; 604 static char *pv[MAXPV+1]; 605 char **pvp; 606 char **mvp; 607 static char buf[512]; 608 register char *bp; 609 char pbuf[30]; 610 611 /* 612 ** Do initial argv setup. 613 ** Insert the mailer name. Notice that $x expansion is 614 ** NOT done on the mailer name. Then, if the mailer has 615 ** a picky -f flag, we insert it as appropriate. This 616 ** code does not check for 'pv' overflow; this places a 617 ** manifest lower limit of 4 for MAXPV. 618 */ 619 620 pvp = pv; 621 bp = buf; 622 623 *pvp++ = tmplt[0]; 624 625 /* insert -f or -r flag as appropriate */ 626 if (flagset(M_FOPT|M_ROPT, flags) && FromFlag) 627 { 628 if (flagset(M_FOPT, flags)) 629 *pvp++ = "-f"; 630 else 631 *pvp++ = "-r"; 632 *pvp++ = From.q_paddr; 633 } 634 635 /* 636 ** Build the rest of argv. 637 ** For each prototype parameter, the prototype is 638 ** scanned character at a time. If a dollar-sign is 639 ** found, 'q' is set to the appropriate expansion, 640 ** otherwise it is null. Then either the string 641 ** pointed to by q, or the original character, is 642 ** interpolated into the buffer. Buffer overflow is 643 ** checked. 644 */ 645 646 for (mvp = tmplt; (p = *++mvp) != NULL; ) 647 { 648 if (pvp >= &pv[MAXPV]) 649 { 650 syserr("Too many parameters to %s", pv[0]); 651 return (NULL); 652 } 653 *pvp++ = bp; 654 for (; *p != '\0'; p++) 655 { 656 /* q will be the interpolated quantity */ 657 q = NULL; 658 if (*p == '$') 659 { 660 switch (*++p) 661 { 662 case 'f': /* from person */ 663 q = from; 664 break; 665 666 case 'u': /* user */ 667 q = user; 668 break; 669 670 case 'h': /* host */ 671 q = host; 672 break; 673 674 case 'c': /* hop count */ 675 sprintf(pbuf, "%d", HopCount); 676 q = pbuf; 677 break; 678 } 679 } 680 681 /* 682 ** Interpolate q or output one character 683 ** Strip quote bits as we proceed..... 684 */ 685 686 if (q != NULL) 687 { 688 while (bp < &buf[sizeof buf - 1] && (*bp++ = *q++) != '\0') 689 continue; 690 bp--; 691 } 692 else if (bp < &buf[sizeof buf - 1]) 693 *bp++ = *p; 694 } 695 *bp++ = '\0'; 696 if (bp >= &buf[sizeof buf - 1]) 697 return (NULL); 698 } 699 *pvp = NULL; 700 701 # ifdef DEBUG 702 if (Debug) 703 { 704 printf("Interpolated argv is:\n"); 705 for (mvp = pv; *mvp != NULL; mvp++) 706 printf("\t%s\n", *mvp); 707 } 708 # endif DEBUG 709 710 return (pv); 711 } 712 /* 713 ** MAILFILE -- Send a message to a file. 714 ** 715 ** Parameters: 716 ** filename -- the name of the file to send to. 717 ** 718 ** Returns: 719 ** The exit code associated with the operation. 720 ** 721 ** Side Effects: 722 ** none. 723 ** 724 ** Called By: 725 ** deliver 726 */ 727 728 mailfile(filename) 729 char *filename; 730 { 731 char buf[MAXLINE]; 732 register FILE *f; 733 auto long tim; 734 extern char *ctime(); 735 736 f = fopen(filename, "a"); 737 if (f == NULL) 738 return (EX_CANTCREAT); 739 740 /* output the timestamp */ 741 time(&tim); 742 fprintf(f, "From %s %s", From.q_paddr, ctime(&tim)); 743 rewind(stdin); 744 while (fgets(buf, sizeof buf, stdin) != NULL) 745 { 746 fputs(buf, f); 747 if (ferror(f)) 748 { 749 fclose(f); 750 return (EX_IOERR); 751 } 752 } 753 fputs("\n", f); 754 fclose(f); 755 return (EX_OK); 756 } 757