1 /* 2 * Copyright (c) 1983 Eric P. Allman 3 * Copyright (c) 1988 Regents of the University of California. 4 * All rights reserved. 5 * 6 * %sccs.include.redist.c% 7 */ 8 9 #ifndef lint 10 static char sccsid[] = "@(#)parseaddr.c 5.15 (Berkeley) 10/20/91"; 11 #endif /* not lint */ 12 13 # include "sendmail.h" 14 15 /* 16 ** PARSEADDR -- Parse an address 17 ** 18 ** Parses an address and breaks it up into three parts: a 19 ** net to transmit the message on, the host to transmit it 20 ** to, and a user on that host. These are loaded into an 21 ** ADDRESS header with the values squirreled away if necessary. 22 ** The "user" part may not be a real user; the process may 23 ** just reoccur on that machine. For example, on a machine 24 ** with an arpanet connection, the address 25 ** csvax.bill@berkeley 26 ** will break up to a "user" of 'csvax.bill' and a host 27 ** of 'berkeley' -- to be transmitted over the arpanet. 28 ** 29 ** Parameters: 30 ** addr -- the address to parse. 31 ** a -- a pointer to the address descriptor buffer. 32 ** If NULL, a header will be created. 33 ** copyf -- determines what shall be copied: 34 ** -1 -- don't copy anything. The printname 35 ** (q_paddr) is just addr, and the 36 ** user & host are allocated internally 37 ** to parse. 38 ** 0 -- copy out the parsed user & host, but 39 ** don't copy the printname. 40 ** +1 -- copy everything. 41 ** delim -- the character to terminate the address, passed 42 ** to prescan. 43 ** 44 ** Returns: 45 ** A pointer to the address descriptor header (`a' if 46 ** `a' is non-NULL). 47 ** NULL on error. 48 ** 49 ** Side Effects: 50 ** none 51 */ 52 53 /* following delimiters are inherent to the internal algorithms */ 54 # define DELIMCHARS "\001()<>,;\\\"\r\n" /* word delimiters */ 55 56 ADDRESS * 57 parseaddr(addr, a, copyf, delim) 58 char *addr; 59 register ADDRESS *a; 60 int copyf; 61 char delim; 62 { 63 register char **pvp; 64 register struct mailer *m; 65 char pvpbuf[PSBUFSIZE]; 66 extern char **prescan(); 67 extern ADDRESS *buildaddr(); 68 69 /* 70 ** Initialize and prescan address. 71 */ 72 73 CurEnv->e_to = addr; 74 if (tTd(20, 1)) 75 printf("\n--parseaddr(%s)\n", addr); 76 77 pvp = prescan(addr, delim, pvpbuf); 78 if (pvp == NULL) 79 return (NULL); 80 81 /* 82 ** Apply rewriting rules. 83 ** Ruleset 0 does basic parsing. It must resolve. 84 */ 85 86 rewrite(pvp, 3); 87 rewrite(pvp, 0); 88 89 /* 90 ** See if we resolved to a real mailer. 91 */ 92 93 if (pvp[0][0] != CANONNET) 94 { 95 setstat(EX_USAGE); 96 usrerr("cannot resolve name"); 97 return (NULL); 98 } 99 100 /* 101 ** Build canonical address from pvp. 102 */ 103 104 a = buildaddr(pvp, a); 105 if (a == NULL) 106 return (NULL); 107 108 /* 109 ** Make local copies of the host & user and then 110 ** transport them out. 111 */ 112 113 allocaddr(a, copyf, addr); 114 115 /* 116 ** Compute return value. 117 */ 118 119 if (tTd(20, 1)) 120 { 121 printf("parseaddr-->"); 122 printaddr(a, FALSE); 123 } 124 125 return (a); 126 } 127 /* 128 ** ALLOCADDR -- do local allocations of address on demand. 129 ** 130 ** Also lowercases the host name if requested. 131 ** 132 ** Parameters: 133 ** a -- the address to reallocate. 134 ** copyf -- the copy flag (see parseaddr for description). 135 ** paddr -- the printname of the address. 136 ** 137 ** Returns: 138 ** none. 139 ** 140 ** Side Effects: 141 ** Copies portions of a into local buffers as requested. 142 */ 143 144 allocaddr(a, copyf, paddr) 145 register ADDRESS *a; 146 int copyf; 147 char *paddr; 148 { 149 register MAILER *m = a->q_mailer; 150 151 if (copyf > 0 && paddr != NULL) 152 { 153 extern char *DelimChar; 154 char savec = *DelimChar; 155 156 *DelimChar = '\0'; 157 a->q_paddr = newstr(paddr); 158 *DelimChar = savec; 159 } 160 else 161 a->q_paddr = paddr; 162 163 if (a->q_user == NULL) 164 a->q_user = ""; 165 if (a->q_host == NULL) 166 a->q_host = ""; 167 168 if (copyf >= 0) 169 { 170 a->q_host = newstr(a->q_host); 171 if (a->q_user != a->q_paddr) 172 a->q_user = newstr(a->q_user); 173 } 174 175 if (a->q_paddr == NULL) 176 a->q_paddr = a->q_user; 177 178 /* 179 ** Convert host name to lower case if requested. 180 ** User name will be done later. 181 */ 182 183 if (!bitnset(M_HST_UPPER, m->m_flags)) 184 makelower(a->q_host); 185 } 186 /* 187 ** LOWERADDR -- map UPPER->lower case on addresses as requested. 188 ** 189 ** Parameters: 190 ** a -- address to be mapped. 191 ** 192 ** Returns: 193 ** none. 194 ** 195 ** Side Effects: 196 ** none. 197 */ 198 199 loweraddr(a) 200 register ADDRESS *a; 201 { 202 register MAILER *m = a->q_mailer; 203 204 if (!bitnset(M_USR_UPPER, m->m_flags)) 205 makelower(a->q_user); 206 } 207 /* 208 ** PRESCAN -- Prescan name and make it canonical 209 ** 210 ** Scans a name and turns it into a set of tokens. This process 211 ** deletes blanks and comments (in parentheses). 212 ** 213 ** This routine knows about quoted strings and angle brackets. 214 ** 215 ** There are certain subtleties to this routine. The one that 216 ** comes to mind now is that backslashes on the ends of names 217 ** are silently stripped off; this is intentional. The problem 218 ** is that some versions of sndmsg (like at LBL) set the kill 219 ** character to something other than @ when reading addresses; 220 ** so people type "csvax.eric\@berkeley" -- which screws up the 221 ** berknet mailer. 222 ** 223 ** Parameters: 224 ** addr -- the name to chomp. 225 ** delim -- the delimiter for the address, normally 226 ** '\0' or ','; \0 is accepted in any case. 227 ** If '\t' then we are reading the .cf file. 228 ** pvpbuf -- place to put the saved text -- note that 229 ** the pointers are static. 230 ** 231 ** Returns: 232 ** A pointer to a vector of tokens. 233 ** NULL on error. 234 ** 235 ** Side Effects: 236 ** sets DelimChar to point to the character matching 'delim'. 237 */ 238 239 /* states and character types */ 240 # define OPR 0 /* operator */ 241 # define ATM 1 /* atom */ 242 # define QST 2 /* in quoted string */ 243 # define SPC 3 /* chewing up spaces */ 244 # define ONE 4 /* pick up one character */ 245 246 # define NSTATES 5 /* number of states */ 247 # define TYPE 017 /* mask to select state type */ 248 249 /* meta bits for table */ 250 # define M 020 /* meta character; don't pass through */ 251 # define B 040 /* cause a break */ 252 # define MB M|B /* meta-break */ 253 254 static short StateTab[NSTATES][NSTATES] = 255 { 256 /* oldst chtype> OPR ATM QST SPC ONE */ 257 /*OPR*/ OPR|B, ATM|B, QST|B, SPC|MB, ONE|B, 258 /*ATM*/ OPR|B, ATM, QST|B, SPC|MB, ONE|B, 259 /*QST*/ QST, QST, OPR, QST, QST, 260 /*SPC*/ OPR, ATM, QST, SPC|M, ONE, 261 /*ONE*/ OPR, OPR, OPR, OPR, OPR, 262 }; 263 264 # define NOCHAR -1 /* signal nothing in lookahead token */ 265 266 char *DelimChar; /* set to point to the delimiter */ 267 268 char ** 269 prescan(addr, delim, pvpbuf) 270 char *addr; 271 char delim; 272 char pvpbuf[]; 273 { 274 register char *p; 275 register char *q; 276 register int c; 277 char **avp; 278 bool bslashmode; 279 int cmntcnt; 280 int anglecnt; 281 char *tok; 282 int state; 283 int newstate; 284 static char *av[MAXATOM+1]; 285 extern int errno; 286 287 /* make sure error messages don't have garbage on them */ 288 errno = 0; 289 290 q = pvpbuf; 291 bslashmode = FALSE; 292 cmntcnt = 0; 293 anglecnt = 0; 294 avp = av; 295 state = OPR; 296 c = NOCHAR; 297 p = addr; 298 if (tTd(22, 45)) 299 { 300 printf("prescan: "); 301 xputs(p); 302 (void) putchar('\n'); 303 } 304 305 do 306 { 307 /* read a token */ 308 tok = q; 309 for (;;) 310 { 311 /* store away any old lookahead character */ 312 if (c != NOCHAR) 313 { 314 /* see if there is room */ 315 if (q >= &pvpbuf[PSBUFSIZE - 5]) 316 { 317 usrerr("Address too long"); 318 DelimChar = p; 319 return (NULL); 320 } 321 322 /* squirrel it away */ 323 *q++ = c; 324 } 325 326 /* read a new input character */ 327 c = *p++; 328 if (c == '\0') 329 break; 330 c &= ~0200; 331 332 if (tTd(22, 101)) 333 printf("c=%c, s=%d; ", c, state); 334 335 /* chew up special characters */ 336 *q = '\0'; 337 if (bslashmode) 338 { 339 /* kludge \! for naive users */ 340 if (c != '!') 341 c |= 0200; 342 bslashmode = FALSE; 343 } 344 345 if (c == '\\') 346 { 347 bslashmode = TRUE; 348 c = NOCHAR; 349 } 350 else if (state == QST) 351 { 352 /* do nothing, just avoid next clauses */ 353 } 354 else if (c == '(') 355 { 356 cmntcnt++; 357 c = NOCHAR; 358 } 359 else if (c == ')') 360 { 361 if (cmntcnt <= 0) 362 { 363 usrerr("Unbalanced ')'"); 364 DelimChar = p; 365 return (NULL); 366 } 367 else 368 cmntcnt--; 369 } 370 else if (cmntcnt > 0) 371 c = NOCHAR; 372 else if (c == '<') 373 anglecnt++; 374 else if (c == '>') 375 { 376 if (anglecnt <= 0) 377 { 378 usrerr("Unbalanced '>'"); 379 DelimChar = p; 380 return (NULL); 381 } 382 anglecnt--; 383 } 384 else if (delim == ' ' && isspace(c)) 385 c = ' '; 386 387 if (c == NOCHAR) 388 continue; 389 390 /* see if this is end of input */ 391 if (c == delim && anglecnt <= 0 && state != QST) 392 break; 393 394 newstate = StateTab[state][toktype(c)]; 395 if (tTd(22, 101)) 396 printf("ns=%02o\n", newstate); 397 state = newstate & TYPE; 398 if (bitset(M, newstate)) 399 c = NOCHAR; 400 if (bitset(B, newstate)) 401 break; 402 } 403 404 /* new token */ 405 if (tok != q) 406 { 407 *q++ = '\0'; 408 if (tTd(22, 36)) 409 { 410 printf("tok="); 411 xputs(tok); 412 (void) putchar('\n'); 413 } 414 if (avp >= &av[MAXATOM]) 415 { 416 syserr("prescan: too many tokens"); 417 DelimChar = p; 418 return (NULL); 419 } 420 *avp++ = tok; 421 } 422 } while (c != '\0' && (c != delim || anglecnt > 0)); 423 *avp = NULL; 424 DelimChar = --p; 425 if (cmntcnt > 0) 426 usrerr("Unbalanced '('"); 427 else if (anglecnt > 0) 428 usrerr("Unbalanced '<'"); 429 else if (state == QST) 430 usrerr("Unbalanced '\"'"); 431 else if (av[0] != NULL) 432 return (av); 433 return (NULL); 434 } 435 /* 436 ** TOKTYPE -- return token type 437 ** 438 ** Parameters: 439 ** c -- the character in question. 440 ** 441 ** Returns: 442 ** Its type. 443 ** 444 ** Side Effects: 445 ** none. 446 */ 447 448 toktype(c) 449 register char c; 450 { 451 static char buf[50]; 452 static bool firstime = TRUE; 453 454 if (firstime) 455 { 456 firstime = FALSE; 457 expand("\001o", buf, &buf[sizeof buf - 1], CurEnv); 458 (void) strcat(buf, DELIMCHARS); 459 } 460 if (c == MATCHCLASS || c == MATCHREPL || c == MATCHNCLASS) 461 return (ONE); 462 if (c == '"') 463 return (QST); 464 if (!isascii(c)) 465 return (ATM); 466 if (isspace(c) || c == ')') 467 return (SPC); 468 if (iscntrl(c) || index(buf, c) != NULL) 469 return (OPR); 470 return (ATM); 471 } 472 /* 473 ** REWRITE -- apply rewrite rules to token vector. 474 ** 475 ** This routine is an ordered production system. Each rewrite 476 ** rule has a LHS (called the pattern) and a RHS (called the 477 ** rewrite); 'rwr' points the the current rewrite rule. 478 ** 479 ** For each rewrite rule, 'avp' points the address vector we 480 ** are trying to match against, and 'pvp' points to the pattern. 481 ** If pvp points to a special match value (MATCHZANY, MATCHANY, 482 ** MATCHONE, MATCHCLASS, MATCHNCLASS) then the address in avp 483 ** matched is saved away in the match vector (pointed to by 'mvp'). 484 ** 485 ** When a match between avp & pvp does not match, we try to 486 ** back out. If we back up over MATCHONE, MATCHCLASS, or MATCHNCLASS 487 ** we must also back out the match in mvp. If we reach a 488 ** MATCHANY or MATCHZANY we just extend the match and start 489 ** over again. 490 ** 491 ** When we finally match, we rewrite the address vector 492 ** and try over again. 493 ** 494 ** Parameters: 495 ** pvp -- pointer to token vector. 496 ** 497 ** Returns: 498 ** none. 499 ** 500 ** Side Effects: 501 ** pvp is modified. 502 */ 503 504 struct match 505 { 506 char **first; /* first token matched */ 507 char **last; /* last token matched */ 508 }; 509 510 # define MAXMATCH 9 /* max params per rewrite */ 511 512 513 rewrite(pvp, ruleset) 514 char **pvp; 515 int ruleset; 516 { 517 register char *ap; /* address pointer */ 518 register char *rp; /* rewrite pointer */ 519 register char **avp; /* address vector pointer */ 520 register char **rvp; /* rewrite vector pointer */ 521 register struct match *mlp; /* cur ptr into mlist */ 522 register struct rewrite *rwr; /* pointer to current rewrite rule */ 523 struct match mlist[MAXMATCH]; /* stores match on LHS */ 524 char *npvp[MAXATOM+1]; /* temporary space for rebuild */ 525 526 if (OpMode == MD_TEST || tTd(21, 2)) 527 { 528 printf("rewrite: ruleset %2d input:", ruleset); 529 printav(pvp); 530 } 531 if (pvp == NULL) 532 return; 533 534 /* 535 ** Run through the list of rewrite rules, applying 536 ** any that match. 537 */ 538 539 for (rwr = RewriteRules[ruleset]; rwr != NULL; ) 540 { 541 if (tTd(21, 12)) 542 { 543 printf("-----trying rule:"); 544 printav(rwr->r_lhs); 545 } 546 547 /* try to match on this rule */ 548 mlp = mlist; 549 rvp = rwr->r_lhs; 550 avp = pvp; 551 while ((ap = *avp) != NULL || *rvp != NULL) 552 { 553 rp = *rvp; 554 if (tTd(21, 35)) 555 { 556 printf("ap="); 557 xputs(ap); 558 printf(", rp="); 559 xputs(rp); 560 printf("\n"); 561 } 562 if (rp == NULL) 563 { 564 /* end-of-pattern before end-of-address */ 565 goto backup; 566 } 567 if (ap == NULL && *rp != MATCHZANY) 568 { 569 /* end-of-input */ 570 break; 571 } 572 573 switch (*rp) 574 { 575 register STAB *s; 576 577 case MATCHCLASS: 578 case MATCHNCLASS: 579 /* match any token in (not in) a class */ 580 s = stab(ap, ST_CLASS, ST_FIND); 581 if (s == NULL || !bitnset(rp[1], s->s_class)) 582 { 583 if (*rp == MATCHCLASS) 584 goto backup; 585 } 586 else if (*rp == MATCHNCLASS) 587 goto backup; 588 589 /* explicit fall-through */ 590 591 case MATCHONE: 592 case MATCHANY: 593 /* match exactly one token */ 594 mlp->first = avp; 595 mlp->last = avp++; 596 mlp++; 597 break; 598 599 case MATCHZANY: 600 /* match zero or more tokens */ 601 mlp->first = avp; 602 mlp->last = avp - 1; 603 mlp++; 604 break; 605 606 default: 607 /* must have exact match */ 608 if (strcasecmp(rp, ap)) 609 goto backup; 610 avp++; 611 break; 612 } 613 614 /* successful match on this token */ 615 rvp++; 616 continue; 617 618 backup: 619 /* match failed -- back up */ 620 while (--rvp >= rwr->r_lhs) 621 { 622 rp = *rvp; 623 if (*rp == MATCHANY || *rp == MATCHZANY) 624 { 625 /* extend binding and continue */ 626 avp = ++mlp[-1].last; 627 avp++; 628 rvp++; 629 break; 630 } 631 avp--; 632 if (*rp == MATCHONE || *rp == MATCHCLASS || 633 *rp == MATCHNCLASS) 634 { 635 /* back out binding */ 636 mlp--; 637 } 638 } 639 640 if (rvp < rwr->r_lhs) 641 { 642 /* total failure to match */ 643 break; 644 } 645 } 646 647 /* 648 ** See if we successfully matched 649 */ 650 651 if (rvp < rwr->r_lhs || *rvp != NULL) 652 { 653 if (tTd(21, 10)) 654 printf("----- rule fails\n"); 655 rwr = rwr->r_next; 656 continue; 657 } 658 659 rvp = rwr->r_rhs; 660 if (tTd(21, 12)) 661 { 662 printf("-----rule matches:"); 663 printav(rvp); 664 } 665 666 rp = *rvp; 667 if (*rp == CANONUSER) 668 { 669 rvp++; 670 rwr = rwr->r_next; 671 } 672 else if (*rp == CANONHOST) 673 { 674 rvp++; 675 rwr = NULL; 676 } 677 else if (*rp == CANONNET) 678 rwr = NULL; 679 680 /* substitute */ 681 for (avp = npvp; *rvp != NULL; rvp++) 682 { 683 register struct match *m; 684 register char **pp; 685 686 rp = *rvp; 687 if (*rp == MATCHREPL) 688 { 689 /* substitute from LHS */ 690 m = &mlist[rp[1] - '1']; 691 if (m >= mlp) 692 { 693 syserr("rewrite: ruleset %d: replacement out of bounds", ruleset); 694 return; 695 } 696 if (tTd(21, 15)) 697 { 698 printf("$%c:", rp[1]); 699 pp = m->first; 700 while (pp <= m->last) 701 { 702 printf(" %x=\"", *pp); 703 (void) fflush(stdout); 704 printf("%s\"", *pp++); 705 } 706 printf("\n"); 707 } 708 pp = m->first; 709 while (pp <= m->last) 710 { 711 if (avp >= &npvp[MAXATOM]) 712 { 713 syserr("rewrite: expansion too long"); 714 return; 715 } 716 *avp++ = *pp++; 717 } 718 } 719 else 720 { 721 /* vanilla replacement */ 722 if (avp >= &npvp[MAXATOM]) 723 { 724 toolong: 725 syserr("rewrite: expansion too long"); 726 return; 727 } 728 *avp++ = rp; 729 } 730 } 731 *avp++ = NULL; 732 733 /* 734 ** Check for any hostname lookups. 735 */ 736 737 for (rvp = npvp; *rvp != NULL; rvp++) 738 { 739 char **hbrvp; 740 char **xpvp; 741 int trsize; 742 char *olddelimchar; 743 char buf[MAXNAME + 1]; 744 char *pvpb1[MAXATOM + 1]; 745 char pvpbuf[PSBUFSIZE]; 746 extern char *DelimChar; 747 748 if (**rvp != HOSTBEGIN) 749 continue; 750 751 /* 752 ** Got a hostname lookup. 753 ** 754 ** This could be optimized fairly easily. 755 */ 756 757 hbrvp = rvp; 758 759 /* extract the match part */ 760 while (*++rvp != NULL && **rvp != HOSTEND) 761 continue; 762 if (*rvp != NULL) 763 *rvp++ = NULL; 764 765 /* save the remainder of the input string */ 766 trsize = (int) (avp - rvp + 1) * sizeof *rvp; 767 bcopy((char *) rvp, (char *) pvpb1, trsize); 768 769 /* look it up */ 770 cataddr(++hbrvp, buf, sizeof buf); 771 if (maphostname(buf, sizeof buf - 1) && ConfigLevel >= 2) 772 { 773 register int i; 774 775 /* it mapped -- mark it with a trailing dot */ 776 i = strlen(buf); 777 if (i > 0 && buf[i - 1] != '.') 778 { 779 buf[i++] = '.'; 780 buf[i] = '\0'; 781 } 782 } 783 784 /* scan the new host name */ 785 olddelimchar = DelimChar; 786 xpvp = prescan(buf, '\0', pvpbuf); 787 DelimChar = olddelimchar; 788 if (xpvp == NULL) 789 { 790 syserr("rewrite: cannot prescan canonical hostname: %s", buf); 791 return; 792 } 793 794 /* append it to the token list */ 795 for (avp = --hbrvp; *xpvp != NULL; xpvp++) 796 { 797 *avp++ = newstr(*xpvp); 798 if (avp >= &npvp[MAXATOM]) 799 goto toolong; 800 } 801 802 /* restore the old trailing information */ 803 for (xpvp = pvpb1; (*avp++ = *xpvp++) != NULL; ) 804 if (avp >= &npvp[MAXATOM]) 805 goto toolong; 806 807 break; 808 } 809 810 /* 811 ** Check for subroutine calls. 812 */ 813 814 if (*npvp != NULL && **npvp == CALLSUBR) 815 { 816 bcopy((char *) &npvp[2], (char *) pvp, 817 (int) (avp - npvp - 2) * sizeof *avp); 818 if (tTd(21, 3)) 819 printf("-----callsubr %s\n", npvp[1]); 820 rewrite(pvp, atoi(npvp[1])); 821 } 822 else 823 { 824 bcopy((char *) npvp, (char *) pvp, 825 (int) (avp - npvp) * sizeof *avp); 826 } 827 if (tTd(21, 4)) 828 { 829 printf("rewritten as:"); 830 printav(pvp); 831 } 832 } 833 834 if (OpMode == MD_TEST || tTd(21, 2)) 835 { 836 printf("rewrite: ruleset %2d returns:", ruleset); 837 printav(pvp); 838 } 839 } 840 /* 841 ** BUILDADDR -- build address from token vector. 842 ** 843 ** Parameters: 844 ** tv -- token vector. 845 ** a -- pointer to address descriptor to fill. 846 ** If NULL, one will be allocated. 847 ** 848 ** Returns: 849 ** NULL if there was an error. 850 ** 'a' otherwise. 851 ** 852 ** Side Effects: 853 ** fills in 'a' 854 */ 855 856 ADDRESS * 857 buildaddr(tv, a) 858 register char **tv; 859 register ADDRESS *a; 860 { 861 static char buf[MAXNAME]; 862 struct mailer **mp; 863 register struct mailer *m; 864 865 if (a == NULL) 866 a = (ADDRESS *) xalloc(sizeof *a); 867 bzero((char *) a, sizeof *a); 868 869 /* figure out what net/mailer to use */ 870 if (**tv != CANONNET) 871 { 872 syserr("buildaddr: no net"); 873 return (NULL); 874 } 875 tv++; 876 if (!strcasecmp(*tv, "error")) 877 { 878 if (**++tv == CANONHOST) 879 { 880 setstat(atoi(*++tv)); 881 tv++; 882 } 883 if (**tv != CANONUSER) 884 syserr("buildaddr: error: no user"); 885 buf[0] = '\0'; 886 while (*++tv != NULL) 887 { 888 if (buf[0] != '\0') 889 (void) strcat(buf, " "); 890 (void) strcat(buf, *tv); 891 } 892 usrerr(buf); 893 return (NULL); 894 } 895 for (mp = Mailer; (m = *mp++) != NULL; ) 896 { 897 if (!strcasecmp(m->m_name, *tv)) 898 break; 899 } 900 if (m == NULL) 901 { 902 syserr("buildaddr: unknown mailer %s", *tv); 903 return (NULL); 904 } 905 a->q_mailer = m; 906 907 /* figure out what host (if any) */ 908 tv++; 909 if (!bitnset(M_LOCAL, m->m_flags)) 910 { 911 if (**tv++ != CANONHOST) 912 { 913 syserr("buildaddr: no host"); 914 return (NULL); 915 } 916 buf[0] = '\0'; 917 while (*tv != NULL && **tv != CANONUSER) 918 (void) strcat(buf, *tv++); 919 a->q_host = newstr(buf); 920 } 921 else 922 a->q_host = NULL; 923 924 /* figure out the user */ 925 if (*tv == NULL || **tv != CANONUSER) 926 { 927 syserr("buildaddr: no user"); 928 return (NULL); 929 } 930 931 if (m == LocalMailer && tv[1] != NULL && strcmp(tv[1], ":") == 0) 932 { 933 tv++; 934 a->q_flags |= QNOTREMOTE; 935 } 936 937 /* rewrite according recipient mailer rewriting rules */ 938 rewrite(++tv, 2); 939 if (m->m_r_rwset > 0) 940 rewrite(tv, m->m_r_rwset); 941 rewrite(tv, 4); 942 943 /* save the result for the command line/RCPT argument */ 944 cataddr(tv, buf, sizeof buf); 945 a->q_user = buf; 946 947 return (a); 948 } 949 /* 950 ** CATADDR -- concatenate pieces of addresses (putting in <LWSP> subs) 951 ** 952 ** Parameters: 953 ** pvp -- parameter vector to rebuild. 954 ** buf -- buffer to build the string into. 955 ** sz -- size of buf. 956 ** 957 ** Returns: 958 ** none. 959 ** 960 ** Side Effects: 961 ** Destroys buf. 962 */ 963 964 cataddr(pvp, buf, sz) 965 char **pvp; 966 char *buf; 967 register int sz; 968 { 969 bool oatomtok = FALSE; 970 bool natomtok = FALSE; 971 register int i; 972 register char *p; 973 974 if (pvp == NULL) 975 { 976 (void) strcpy(buf, ""); 977 return; 978 } 979 p = buf; 980 sz -= 2; 981 while (*pvp != NULL && (i = strlen(*pvp)) < sz) 982 { 983 natomtok = (toktype(**pvp) == ATM); 984 if (oatomtok && natomtok) 985 *p++ = SpaceSub; 986 (void) strcpy(p, *pvp); 987 oatomtok = natomtok; 988 p += i; 989 sz -= i + 1; 990 pvp++; 991 } 992 *p = '\0'; 993 } 994 /* 995 ** SAMEADDR -- Determine if two addresses are the same 996 ** 997 ** This is not just a straight comparison -- if the mailer doesn't 998 ** care about the host we just ignore it, etc. 999 ** 1000 ** Parameters: 1001 ** a, b -- pointers to the internal forms to compare. 1002 ** 1003 ** Returns: 1004 ** TRUE -- they represent the same mailbox. 1005 ** FALSE -- they don't. 1006 ** 1007 ** Side Effects: 1008 ** none. 1009 */ 1010 1011 bool 1012 sameaddr(a, b) 1013 register ADDRESS *a; 1014 register ADDRESS *b; 1015 { 1016 /* if they don't have the same mailer, forget it */ 1017 if (a->q_mailer != b->q_mailer) 1018 return (FALSE); 1019 1020 /* if the user isn't the same, we can drop out */ 1021 if (strcmp(a->q_user, b->q_user) != 0) 1022 return (FALSE); 1023 1024 /* if the mailer ignores hosts, we have succeeded! */ 1025 if (bitnset(M_LOCAL, a->q_mailer->m_flags)) 1026 return (TRUE); 1027 1028 /* otherwise compare hosts (but be careful for NULL ptrs) */ 1029 if (a->q_host == NULL || b->q_host == NULL) 1030 return (FALSE); 1031 if (strcmp(a->q_host, b->q_host) != 0) 1032 return (FALSE); 1033 1034 return (TRUE); 1035 } 1036 /* 1037 ** PRINTADDR -- print address (for debugging) 1038 ** 1039 ** Parameters: 1040 ** a -- the address to print 1041 ** follow -- follow the q_next chain. 1042 ** 1043 ** Returns: 1044 ** none. 1045 ** 1046 ** Side Effects: 1047 ** none. 1048 */ 1049 1050 printaddr(a, follow) 1051 register ADDRESS *a; 1052 bool follow; 1053 { 1054 bool first = TRUE; 1055 1056 while (a != NULL) 1057 { 1058 first = FALSE; 1059 printf("%x=", a); 1060 (void) fflush(stdout); 1061 printf("%s: mailer %d (%s), host `%s', user `%s', ruser `%s'\n", 1062 a->q_paddr, a->q_mailer->m_mno, a->q_mailer->m_name, 1063 a->q_host, a->q_user, a->q_ruser? a->q_ruser: "<null>"); 1064 printf("\tnext=%x, flags=%o, alias %x\n", a->q_next, a->q_flags, 1065 a->q_alias); 1066 printf("\thome=\"%s\", fullname=\"%s\"\n", a->q_home, 1067 a->q_fullname); 1068 1069 if (!follow) 1070 return; 1071 a = a->q_next; 1072 } 1073 if (first) 1074 printf("[NULL]\n"); 1075 } 1076 1077 /* 1078 ** REMOTENAME -- return the name relative to the current mailer 1079 ** 1080 ** Parameters: 1081 ** name -- the name to translate. 1082 ** m -- the mailer that we want to do rewriting relative 1083 ** to. 1084 ** senderaddress -- if set, uses the sender rewriting rules 1085 ** rather than the recipient rewriting rules. 1086 ** canonical -- if set, strip out any comment information, 1087 ** etc. 1088 ** 1089 ** Returns: 1090 ** the text string representing this address relative to 1091 ** the receiving mailer. 1092 ** 1093 ** Side Effects: 1094 ** none. 1095 ** 1096 ** Warnings: 1097 ** The text string returned is tucked away locally; 1098 ** copy it if you intend to save it. 1099 */ 1100 1101 char * 1102 remotename(name, m, senderaddress, canonical) 1103 char *name; 1104 struct mailer *m; 1105 bool senderaddress; 1106 bool canonical; 1107 { 1108 register char **pvp; 1109 char *fancy; 1110 extern char *macvalue(); 1111 char *oldg = macvalue('g', CurEnv); 1112 static char buf[MAXNAME]; 1113 char lbuf[MAXNAME]; 1114 char pvpbuf[PSBUFSIZE]; 1115 extern char **prescan(); 1116 extern char *crackaddr(); 1117 1118 if (tTd(12, 1)) 1119 printf("remotename(%s)\n", name); 1120 1121 /* don't do anything if we are tagging it as special */ 1122 if ((senderaddress ? m->m_s_rwset : m->m_r_rwset) < 0) 1123 return (name); 1124 1125 /* 1126 ** Do a heuristic crack of this name to extract any comment info. 1127 ** This will leave the name as a comment and a $g macro. 1128 */ 1129 1130 if (canonical) 1131 fancy = "\001g"; 1132 else 1133 fancy = crackaddr(name); 1134 1135 /* 1136 ** Turn the name into canonical form. 1137 ** Normally this will be RFC 822 style, i.e., "user@domain". 1138 ** If this only resolves to "user", and the "C" flag is 1139 ** specified in the sending mailer, then the sender's 1140 ** domain will be appended. 1141 */ 1142 1143 pvp = prescan(name, '\0', pvpbuf); 1144 if (pvp == NULL) 1145 return (name); 1146 rewrite(pvp, 3); 1147 if (CurEnv->e_fromdomain != NULL) 1148 { 1149 /* append from domain to this address */ 1150 register char **pxp = pvp; 1151 1152 /* see if there is an "@domain" in the current name */ 1153 while (*pxp != NULL && strcmp(*pxp, "@") != 0) 1154 pxp++; 1155 if (*pxp == NULL) 1156 { 1157 /* no.... append the "@domain" from the sender */ 1158 register char **qxq = CurEnv->e_fromdomain; 1159 1160 while ((*pxp++ = *qxq++) != NULL) 1161 continue; 1162 rewrite(pvp, 3); 1163 } 1164 } 1165 1166 /* 1167 ** Do more specific rewriting. 1168 ** Rewrite using ruleset 1 or 2 depending on whether this is 1169 ** a sender address or not. 1170 ** Then run it through any receiving-mailer-specific rulesets. 1171 */ 1172 1173 if (senderaddress) 1174 { 1175 rewrite(pvp, 1); 1176 if (m->m_s_rwset > 0) 1177 rewrite(pvp, m->m_s_rwset); 1178 } 1179 else 1180 { 1181 rewrite(pvp, 2); 1182 if (m->m_r_rwset > 0) 1183 rewrite(pvp, m->m_r_rwset); 1184 } 1185 1186 /* 1187 ** Do any final sanitation the address may require. 1188 ** This will normally be used to turn internal forms 1189 ** (e.g., user@host.LOCAL) into external form. This 1190 ** may be used as a default to the above rules. 1191 */ 1192 1193 rewrite(pvp, 4); 1194 1195 /* 1196 ** Now restore the comment information we had at the beginning. 1197 */ 1198 1199 cataddr(pvp, lbuf, sizeof lbuf); 1200 define('g', lbuf, CurEnv); 1201 expand(fancy, buf, &buf[sizeof buf - 1], CurEnv); 1202 define('g', oldg, CurEnv); 1203 1204 if (tTd(12, 1)) 1205 printf("remotename => `%s'\n", buf); 1206 return (buf); 1207 } 1208 /* 1209 ** MAPLOCALUSER -- run local username through ruleset 5 for final redirection 1210 ** 1211 ** Parameters: 1212 ** a -- the address to map (but just the user name part). 1213 ** sendq -- the sendq in which to install any replacement 1214 ** addresses. 1215 ** 1216 ** Returns: 1217 ** none. 1218 */ 1219 1220 maplocaluser(a, sendq) 1221 register ADDRESS *a; 1222 ADDRESS **sendq; 1223 { 1224 register char **pvp; 1225 register ADDRESS *a1 = NULL; 1226 char pvpbuf[PSBUFSIZE]; 1227 1228 if (tTd(29, 1)) 1229 { 1230 printf("maplocaluser: "); 1231 printaddr(a, FALSE); 1232 } 1233 pvp = prescan(a->q_user, '\0', pvpbuf); 1234 if (pvp == NULL) 1235 return; 1236 1237 rewrite(pvp, 5); 1238 if (pvp[0] == NULL || pvp[0][0] != CANONNET) 1239 return; 1240 1241 /* if non-null, mailer destination specified -- has it changed? */ 1242 a1 = buildaddr(pvp, NULL); 1243 if (a1 == NULL || sameaddr(a, a1)) 1244 return; 1245 1246 /* mark old address as dead; insert new address */ 1247 a->q_flags |= QDONTSEND; 1248 a1->q_alias = a; 1249 allocaddr(a1, 1, NULL); 1250 (void) recipient(a1, sendq); 1251 } 1252