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 6.35 (Berkeley) 03/30/93"; 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 ** delimptr -- if non-NULL, set to the location of the 44 ** delim character that was found. 45 ** e -- the envelope that will contain this address. 46 ** 47 ** Returns: 48 ** A pointer to the address descriptor header (`a' if 49 ** `a' is non-NULL). 50 ** NULL on error. 51 ** 52 ** Side Effects: 53 ** none 54 */ 55 56 /* following delimiters are inherent to the internal algorithms */ 57 # define DELIMCHARS "\201()<>,;\\\"\r\n" /* word delimiters */ 58 59 ADDRESS * 60 parseaddr(addr, a, copyf, delim, delimptr, e) 61 char *addr; 62 register ADDRESS *a; 63 int copyf; 64 char delim; 65 char **delimptr; 66 register ENVELOPE *e; 67 { 68 register char **pvp; 69 auto char *delimptrbuf; 70 char pvpbuf[PSBUFSIZE]; 71 extern char **prescan(); 72 extern ADDRESS *buildaddr(); 73 extern bool invalidaddr(); 74 75 /* 76 ** Initialize and prescan address. 77 */ 78 79 e->e_to = addr; 80 if (tTd(20, 1)) 81 printf("\n--parseaddr(%s)\n", addr); 82 83 if (invalidaddr(addr)) 84 { 85 if (tTd(20, 1)) 86 printf("parseaddr-->bad address\n"); 87 return NULL; 88 } 89 90 if (delimptr == NULL) 91 delimptr = &delimptrbuf; 92 93 pvp = prescan(addr, delim, pvpbuf, delimptr); 94 if (pvp == NULL) 95 { 96 if (tTd(20, 1)) 97 printf("parseaddr-->NULL\n"); 98 return (NULL); 99 } 100 101 /* 102 ** Apply rewriting rules. 103 ** Ruleset 0 does basic parsing. It must resolve. 104 */ 105 106 rewrite(pvp, 3); 107 rewrite(pvp, 0); 108 109 /* 110 ** See if we resolved to a real mailer. 111 */ 112 113 if ((pvp[0][0] & 0377) != CANONNET) 114 { 115 setstat(EX_USAGE); 116 syserr("554 cannot resolve name"); 117 return (NULL); 118 } 119 120 /* 121 ** Build canonical address from pvp. 122 */ 123 124 a = buildaddr(pvp, a); 125 if (a == NULL) 126 return (NULL); 127 128 /* 129 ** Make local copies of the host & user and then 130 ** transport them out. 131 */ 132 133 allocaddr(a, copyf, addr, *delimptr); 134 135 /* 136 ** Compute return value. 137 */ 138 139 if (tTd(20, 1)) 140 { 141 printf("parseaddr-->"); 142 printaddr(a, FALSE); 143 } 144 145 return (a); 146 } 147 /* 148 ** INVALIDADDR -- check for address containing meta-characters 149 ** 150 ** Parameters: 151 ** addr -- the address to check. 152 ** 153 ** Returns: 154 ** TRUE -- if the address has any "wierd" characters 155 ** FALSE -- otherwise. 156 */ 157 158 bool 159 invalidaddr(addr) 160 register char *addr; 161 { 162 for (; *addr != '\0'; addr++) 163 { 164 if ((*addr & 0340) != 0200) 165 continue; 166 setstat(EX_USAGE); 167 usrerr("553 Address contained invalid control characters"); 168 return TRUE; 169 } 170 return FALSE; 171 } 172 /* 173 ** ALLOCADDR -- do local allocations of address on demand. 174 ** 175 ** Also lowercases the host name if requested. 176 ** 177 ** Parameters: 178 ** a -- the address to reallocate. 179 ** copyf -- the copy flag (see parseaddr for description). 180 ** paddr -- the printname of the address. 181 ** delimptr -- a pointer to the address delimiter. Must be set. 182 ** 183 ** Returns: 184 ** none. 185 ** 186 ** Side Effects: 187 ** Copies portions of a into local buffers as requested. 188 */ 189 190 allocaddr(a, copyf, paddr, delimptr) 191 register ADDRESS *a; 192 int copyf; 193 char *paddr; 194 char *delimptr; 195 { 196 register MAILER *m = a->q_mailer; 197 198 if (tTd(24, 4)) 199 printf("allocaddr(copyf=%d, paddr=%s)\n", copyf, paddr); 200 201 if (copyf > 0 && paddr != NULL) 202 { 203 char savec = *delimptr; 204 205 *delimptr = '\0'; 206 a->q_paddr = newstr(paddr); 207 *delimptr = savec; 208 } 209 else 210 a->q_paddr = paddr; 211 212 if (a->q_user == NULL) 213 a->q_user = ""; 214 if (a->q_host == NULL) 215 a->q_host = ""; 216 217 if (copyf >= 0) 218 { 219 a->q_host = newstr(a->q_host); 220 if (a->q_user != a->q_paddr) 221 a->q_user = newstr(a->q_user); 222 } 223 224 if (a->q_paddr == NULL) 225 a->q_paddr = a->q_user; 226 } 227 /* 228 ** PRESCAN -- Prescan name and make it canonical 229 ** 230 ** Scans a name and turns it into a set of tokens. This process 231 ** deletes blanks and comments (in parentheses). 232 ** 233 ** This routine knows about quoted strings and angle brackets. 234 ** 235 ** There are certain subtleties to this routine. The one that 236 ** comes to mind now is that backslashes on the ends of names 237 ** are silently stripped off; this is intentional. The problem 238 ** is that some versions of sndmsg (like at LBL) set the kill 239 ** character to something other than @ when reading addresses; 240 ** so people type "csvax.eric\@berkeley" -- which screws up the 241 ** berknet mailer. 242 ** 243 ** Parameters: 244 ** addr -- the name to chomp. 245 ** delim -- the delimiter for the address, normally 246 ** '\0' or ','; \0 is accepted in any case. 247 ** If '\t' then we are reading the .cf file. 248 ** pvpbuf -- place to put the saved text -- note that 249 ** the pointers are static. 250 ** delimptr -- if non-NULL, set to the location of the 251 ** terminating delimiter. 252 ** 253 ** Returns: 254 ** A pointer to a vector of tokens. 255 ** NULL on error. 256 */ 257 258 /* states and character types */ 259 # define OPR 0 /* operator */ 260 # define ATM 1 /* atom */ 261 # define QST 2 /* in quoted string */ 262 # define SPC 3 /* chewing up spaces */ 263 # define ONE 4 /* pick up one character */ 264 265 # define NSTATES 5 /* number of states */ 266 # define TYPE 017 /* mask to select state type */ 267 268 /* meta bits for table */ 269 # define M 020 /* meta character; don't pass through */ 270 # define B 040 /* cause a break */ 271 # define MB M|B /* meta-break */ 272 273 static short StateTab[NSTATES][NSTATES] = 274 { 275 /* oldst chtype> OPR ATM QST SPC ONE */ 276 /*OPR*/ OPR|B, ATM|B, QST|B, SPC|MB, ONE|B, 277 /*ATM*/ OPR|B, ATM, QST|B, SPC|MB, ONE|B, 278 /*QST*/ QST, QST, OPR, QST, QST, 279 /*SPC*/ OPR, ATM, QST, SPC|M, ONE, 280 /*ONE*/ OPR, OPR, OPR, OPR, OPR, 281 }; 282 283 # define NOCHAR -1 /* signal nothing in lookahead token */ 284 285 char ** 286 prescan(addr, delim, pvpbuf, delimptr) 287 char *addr; 288 char delim; 289 char pvpbuf[]; 290 char **delimptr; 291 { 292 register char *p; 293 register char *q; 294 register int c; 295 char **avp; 296 bool bslashmode; 297 int cmntcnt; 298 int anglecnt; 299 char *tok; 300 int state; 301 int newstate; 302 static char *av[MAXATOM+1]; 303 extern int errno; 304 305 /* make sure error messages don't have garbage on them */ 306 errno = 0; 307 308 q = pvpbuf; 309 bslashmode = FALSE; 310 cmntcnt = 0; 311 anglecnt = 0; 312 avp = av; 313 state = ATM; 314 c = NOCHAR; 315 p = addr; 316 if (tTd(22, 11)) 317 { 318 printf("prescan: "); 319 xputs(p); 320 (void) putchar('\n'); 321 } 322 323 do 324 { 325 /* read a token */ 326 tok = q; 327 for (;;) 328 { 329 /* store away any old lookahead character */ 330 if (c != NOCHAR) 331 { 332 /* see if there is room */ 333 if (q >= &pvpbuf[PSBUFSIZE - 5]) 334 { 335 usrerr("553 Address too long"); 336 if (delimptr != NULL) 337 *delimptr = p; 338 return (NULL); 339 } 340 341 /* squirrel it away */ 342 *q++ = c; 343 } 344 345 /* read a new input character */ 346 c = *p++; 347 if (c == '\0') 348 { 349 /* diagnose and patch up bad syntax */ 350 if (state == QST) 351 { 352 usrerr("553 Unbalanced '\"'"); 353 c = '"'; 354 } 355 else if (cmntcnt > 0) 356 { 357 usrerr("553 Unbalanced '('"); 358 c = ')'; 359 } 360 else if (anglecnt > 0) 361 { 362 c = '>'; 363 usrerr("553 Unbalanced '<'"); 364 } 365 else 366 break; 367 368 p--; 369 } 370 else if (c == delim && anglecnt <= 0 && 371 cmntcnt <= 0 && state != QST) 372 break; 373 374 if (tTd(22, 101)) 375 printf("c=%c, s=%d; ", c, state); 376 377 /* chew up special characters */ 378 *q = '\0'; 379 if (bslashmode) 380 { 381 /* kludge \! for naive users */ 382 if (cmntcnt > 0) 383 c = NOCHAR; 384 else if (c != '!') 385 *q++ = '\\'; 386 bslashmode = FALSE; 387 continue; 388 } 389 390 if (c == '\\') 391 { 392 bslashmode = TRUE; 393 c = NOCHAR; 394 continue; 395 } 396 else if (state == QST) 397 { 398 /* do nothing, just avoid next clauses */ 399 } 400 else if (c == '(') 401 { 402 cmntcnt++; 403 c = NOCHAR; 404 } 405 else if (c == ')') 406 { 407 if (cmntcnt <= 0) 408 { 409 usrerr("553 Unbalanced ')'"); 410 if (delimptr != NULL) 411 *delimptr = p; 412 return (NULL); 413 } 414 else 415 cmntcnt--; 416 } 417 else if (cmntcnt > 0) 418 c = NOCHAR; 419 else if (c == '<') 420 anglecnt++; 421 else if (c == '>') 422 { 423 if (anglecnt <= 0) 424 { 425 usrerr("553 Unbalanced '>'"); 426 if (delimptr != NULL) 427 *delimptr = p; 428 return (NULL); 429 } 430 anglecnt--; 431 } 432 else if (delim == ' ' && isascii(c) && isspace(c)) 433 c = ' '; 434 435 if (c == NOCHAR) 436 continue; 437 438 /* see if this is end of input */ 439 if (c == delim && anglecnt <= 0 && state != QST) 440 break; 441 442 newstate = StateTab[state][toktype(c)]; 443 if (tTd(22, 101)) 444 printf("ns=%02o\n", newstate); 445 state = newstate & TYPE; 446 if (bitset(M, newstate)) 447 c = NOCHAR; 448 if (bitset(B, newstate)) 449 break; 450 } 451 452 /* new token */ 453 if (tok != q) 454 { 455 *q++ = '\0'; 456 if (tTd(22, 36)) 457 { 458 printf("tok="); 459 xputs(tok); 460 (void) putchar('\n'); 461 } 462 if (avp >= &av[MAXATOM]) 463 { 464 syserr("553 prescan: too many tokens"); 465 if (delimptr != NULL) 466 *delimptr = p; 467 return (NULL); 468 } 469 *avp++ = tok; 470 } 471 } while (c != '\0' && (c != delim || anglecnt > 0)); 472 *avp = NULL; 473 p--; 474 if (delimptr != NULL) 475 *delimptr = p; 476 if (tTd(22, 12)) 477 { 478 printf("prescan==>"); 479 printav(av); 480 } 481 if (av[0] == NULL) 482 return (NULL); 483 return (av); 484 } 485 /* 486 ** TOKTYPE -- return token type 487 ** 488 ** Parameters: 489 ** c -- the character in question. 490 ** 491 ** Returns: 492 ** Its type. 493 ** 494 ** Side Effects: 495 ** none. 496 */ 497 498 toktype(c) 499 register int c; 500 { 501 static char buf[50]; 502 static bool firstime = TRUE; 503 504 if (firstime) 505 { 506 firstime = FALSE; 507 expand("\201o", buf, &buf[sizeof buf - 1], CurEnv); 508 (void) strcat(buf, DELIMCHARS); 509 } 510 c &= 0377; 511 if (c == MATCHCLASS || c == MATCHREPL || c == MATCHNCLASS) 512 return (ONE); 513 if (c == '"') 514 return (QST); 515 if ((c & 0340) == 0200) 516 return (OPR); 517 if (!isascii(c)) 518 return (ATM); 519 if (isspace(c) || c == ')') 520 return (SPC); 521 if (strchr(buf, c) != NULL) 522 return (OPR); 523 return (ATM); 524 } 525 /* 526 ** REWRITE -- apply rewrite rules to token vector. 527 ** 528 ** This routine is an ordered production system. Each rewrite 529 ** rule has a LHS (called the pattern) and a RHS (called the 530 ** rewrite); 'rwr' points the the current rewrite rule. 531 ** 532 ** For each rewrite rule, 'avp' points the address vector we 533 ** are trying to match against, and 'pvp' points to the pattern. 534 ** If pvp points to a special match value (MATCHZANY, MATCHANY, 535 ** MATCHONE, MATCHCLASS, MATCHNCLASS) then the address in avp 536 ** matched is saved away in the match vector (pointed to by 'mvp'). 537 ** 538 ** When a match between avp & pvp does not match, we try to 539 ** back out. If we back up over MATCHONE, MATCHCLASS, or MATCHNCLASS 540 ** we must also back out the match in mvp. If we reach a 541 ** MATCHANY or MATCHZANY we just extend the match and start 542 ** over again. 543 ** 544 ** When we finally match, we rewrite the address vector 545 ** and try over again. 546 ** 547 ** Parameters: 548 ** pvp -- pointer to token vector. 549 ** 550 ** Returns: 551 ** none. 552 ** 553 ** Side Effects: 554 ** pvp is modified. 555 */ 556 557 struct match 558 { 559 char **first; /* first token matched */ 560 char **last; /* last token matched */ 561 char **pattern; /* pointer to pattern */ 562 }; 563 564 # define MAXMATCH 9 /* max params per rewrite */ 565 566 567 rewrite(pvp, ruleset) 568 char **pvp; 569 int ruleset; 570 { 571 register char *ap; /* address pointer */ 572 register char *rp; /* rewrite pointer */ 573 register char **avp; /* address vector pointer */ 574 register char **rvp; /* rewrite vector pointer */ 575 register struct match *mlp; /* cur ptr into mlist */ 576 register struct rewrite *rwr; /* pointer to current rewrite rule */ 577 int ruleno; /* current rule number */ 578 struct match mlist[MAXMATCH]; /* stores match on LHS */ 579 char *npvp[MAXATOM+1]; /* temporary space for rebuild */ 580 581 if (OpMode == MD_TEST || tTd(21, 2)) 582 { 583 printf("rewrite: ruleset %2d input:", ruleset); 584 printav(pvp); 585 } 586 if (ruleset < 0 || ruleset >= MAXRWSETS) 587 { 588 syserr("554 rewrite: illegal ruleset number %d", ruleset); 589 return; 590 } 591 if (pvp == NULL) 592 return; 593 594 /* 595 ** Run through the list of rewrite rules, applying 596 ** any that match. 597 */ 598 599 ruleno = 1; 600 for (rwr = RewriteRules[ruleset]; rwr != NULL; ) 601 { 602 int loopcount = 0; 603 604 if (tTd(21, 12)) 605 { 606 printf("-----trying rule:"); 607 printav(rwr->r_lhs); 608 } 609 610 /* try to match on this rule */ 611 mlp = mlist; 612 rvp = rwr->r_lhs; 613 avp = pvp; 614 if (++loopcount > 100) 615 { 616 syserr("554 Infinite loop in ruleset %d, rule %d", 617 ruleset, ruleno); 618 if (tTd(21, 1)) 619 { 620 printf("workspace: "); 621 printav(pvp); 622 } 623 break; 624 } 625 626 while ((ap = *avp) != NULL || *rvp != NULL) 627 { 628 rp = *rvp; 629 if (tTd(21, 35)) 630 { 631 printf("ADVANCE rp="); 632 xputs(rp); 633 printf(", ap="); 634 xputs(ap); 635 printf("\n"); 636 } 637 if (rp == NULL) 638 { 639 /* end-of-pattern before end-of-address */ 640 goto backup; 641 } 642 if (ap == NULL && (*rp & 0377) != MATCHZANY && 643 (*rp & 0377) != MATCHZERO) 644 { 645 /* end-of-input with patterns left */ 646 goto backup; 647 } 648 649 switch (*rp & 0377) 650 { 651 register STAB *s; 652 char buf[MAXLINE]; 653 654 case MATCHCLASS: 655 /* match any phrase in a class */ 656 mlp->pattern = rvp; 657 mlp->first = avp; 658 extendclass: 659 ap = *avp; 660 if (ap == NULL) 661 goto backup; 662 mlp->last = avp++; 663 cataddr(mlp->first, mlp->last, buf, sizeof buf, '\0'); 664 s = stab(buf, ST_CLASS, ST_FIND); 665 if (s == NULL || !bitnset(rp[1], s->s_class)) 666 { 667 if (tTd(21, 36)) 668 { 669 printf("EXTEND rp="); 670 xputs(rp); 671 printf(", ap="); 672 xputs(ap); 673 printf("\n"); 674 } 675 goto extendclass; 676 } 677 if (tTd(21, 36)) 678 printf("CLMATCH\n"); 679 mlp++; 680 break; 681 682 case MATCHNCLASS: 683 /* match any token not in a class */ 684 s = stab(ap, ST_CLASS, ST_FIND); 685 if (s != NULL && bitnset(rp[1], s->s_class)) 686 goto backup; 687 688 /* fall through */ 689 690 case MATCHONE: 691 case MATCHANY: 692 /* match exactly one token */ 693 mlp->pattern = rvp; 694 mlp->first = avp; 695 mlp->last = avp++; 696 mlp++; 697 break; 698 699 case MATCHZANY: 700 /* match zero or more tokens */ 701 mlp->pattern = rvp; 702 mlp->first = avp; 703 mlp->last = avp - 1; 704 mlp++; 705 break; 706 707 case MATCHZERO: 708 /* match zero tokens */ 709 break; 710 711 default: 712 /* must have exact match */ 713 if (strcasecmp(rp, ap)) 714 goto backup; 715 avp++; 716 break; 717 } 718 719 /* successful match on this token */ 720 rvp++; 721 continue; 722 723 backup: 724 /* match failed -- back up */ 725 while (--mlp >= mlist) 726 { 727 rvp = mlp->pattern; 728 rp = *rvp; 729 avp = mlp->last + 1; 730 ap = *avp; 731 732 if (tTd(21, 36)) 733 { 734 printf("BACKUP rp="); 735 xputs(rp); 736 printf(", ap="); 737 xputs(ap); 738 printf("\n"); 739 } 740 741 if (ap == NULL) 742 { 743 /* run off the end -- back up again */ 744 continue; 745 } 746 if ((*rp & 0377) == MATCHANY || 747 (*rp & 0377) == MATCHZANY) 748 { 749 /* extend binding and continue */ 750 mlp->last = avp++; 751 rvp++; 752 mlp++; 753 break; 754 } 755 if ((*rp & 0377) == MATCHCLASS) 756 { 757 /* extend binding and try again */ 758 mlp->last = avp++; 759 goto extendclass; 760 } 761 } 762 763 if (mlp < mlist) 764 { 765 /* total failure to match */ 766 break; 767 } 768 } 769 770 /* 771 ** See if we successfully matched 772 */ 773 774 if (mlp < mlist || *rvp != NULL) 775 { 776 if (tTd(21, 10)) 777 printf("----- rule fails\n"); 778 rwr = rwr->r_next; 779 ruleno++; 780 continue; 781 } 782 783 rvp = rwr->r_rhs; 784 if (tTd(21, 12)) 785 { 786 printf("-----rule matches:"); 787 printav(rvp); 788 } 789 790 rp = *rvp; 791 if ((*rp & 0377) == CANONUSER) 792 { 793 rvp++; 794 rwr = rwr->r_next; 795 ruleno++; 796 } 797 else if ((*rp & 0377) == CANONHOST) 798 { 799 rvp++; 800 rwr = NULL; 801 } 802 else if ((*rp & 0377) == CANONNET) 803 rwr = NULL; 804 805 /* substitute */ 806 for (avp = npvp; *rvp != NULL; rvp++) 807 { 808 register struct match *m; 809 register char **pp; 810 811 rp = *rvp; 812 if ((*rp & 0377) == MATCHREPL) 813 { 814 /* substitute from LHS */ 815 m = &mlist[rp[1] - '1']; 816 if (m < mlist || m >= mlp) 817 { 818 syserr("554 rewrite: ruleset %d: replacement $%c out of bounds", 819 ruleset, rp[1]); 820 return; 821 } 822 if (tTd(21, 15)) 823 { 824 printf("$%c:", rp[1]); 825 pp = m->first; 826 while (pp <= m->last) 827 { 828 printf(" %x=\"", *pp); 829 (void) fflush(stdout); 830 printf("%s\"", *pp++); 831 } 832 printf("\n"); 833 } 834 pp = m->first; 835 while (pp <= m->last) 836 { 837 if (avp >= &npvp[MAXATOM]) 838 { 839 syserr("554 rewrite: expansion too long"); 840 return; 841 } 842 *avp++ = *pp++; 843 } 844 } 845 else 846 { 847 /* vanilla replacement */ 848 if (avp >= &npvp[MAXATOM]) 849 { 850 toolong: 851 syserr("554 rewrite: expansion too long"); 852 return; 853 } 854 *avp++ = rp; 855 } 856 } 857 *avp++ = NULL; 858 859 /* 860 ** Check for any hostname/keyword lookups. 861 */ 862 863 for (rvp = npvp; *rvp != NULL; rvp++) 864 { 865 char **hbrvp; 866 char **xpvp; 867 int trsize; 868 char *olddelimchar; 869 char *replac; 870 int endtoken; 871 STAB *map; 872 char *mapname; 873 char **key_rvp; 874 char **arg_rvp; 875 char **default_rvp; 876 char buf[MAXNAME + 1]; 877 char *pvpb1[MAXATOM + 1]; 878 char *argvect[10]; 879 char pvpbuf[PSBUFSIZE]; 880 881 if ((**rvp & 0377) != HOSTBEGIN && 882 (**rvp & 0377) != LOOKUPBEGIN) 883 continue; 884 885 /* 886 ** Got a hostname/keyword lookup. 887 ** 888 ** This could be optimized fairly easily. 889 */ 890 891 hbrvp = rvp; 892 if ((**rvp & 0377) == HOSTBEGIN) 893 { 894 endtoken = HOSTEND; 895 mapname = "host"; 896 } 897 else 898 { 899 endtoken = LOOKUPEND; 900 mapname = *++rvp; 901 } 902 map = stab(mapname, ST_MAP, ST_FIND); 903 if (map == NULL) 904 syserr("554 rewrite: map %s not found", mapname); 905 906 /* extract the match part */ 907 key_rvp = ++rvp; 908 default_rvp = NULL; 909 arg_rvp = argvect; 910 xpvp = NULL; 911 replac = pvpbuf; 912 while (*rvp != NULL && (**rvp & 0377) != endtoken) 913 { 914 int nodetype = **rvp & 0377; 915 916 if (nodetype != CANONHOST && nodetype != CANONUSER) 917 { 918 rvp++; 919 continue; 920 } 921 922 *rvp++ = NULL; 923 924 if (xpvp != NULL) 925 { 926 cataddr(xpvp, NULL, replac, 927 &pvpbuf[sizeof pvpbuf] - replac, 928 '\0'); 929 *++arg_rvp = replac; 930 replac += strlen(replac) + 1; 931 xpvp = NULL; 932 } 933 switch (nodetype) 934 { 935 case CANONHOST: 936 xpvp = rvp; 937 break; 938 939 case CANONUSER: 940 default_rvp = rvp; 941 break; 942 } 943 } 944 if (*rvp != NULL) 945 *rvp++ = NULL; 946 if (xpvp != NULL) 947 { 948 cataddr(xpvp, NULL, replac, 949 &pvpbuf[sizeof pvpbuf] - replac, 950 '\0'); 951 *++arg_rvp = replac; 952 } 953 *++arg_rvp = NULL; 954 955 /* save the remainder of the input string */ 956 trsize = (int) (avp - rvp + 1) * sizeof *rvp; 957 bcopy((char *) rvp, (char *) pvpb1, trsize); 958 959 /* look it up */ 960 cataddr(key_rvp, NULL, buf, sizeof buf, '\0'); 961 argvect[0] = buf; 962 if (map != NULL && bitset(MF_VALID, map->s_map.map_flags)) 963 { 964 int bsize = sizeof buf - 1; 965 966 if (map->s_map.map_app != NULL) 967 bsize -= strlen(map->s_map.map_app); 968 if (tTd(60, 1)) 969 printf("map_lookup(%s, %s) => ", 970 mapname, buf); 971 replac = (*map->s_map.map_class->map_lookup)(&map->s_map, 972 buf, sizeof buf - 1, argvect); 973 if (replac != NULL && map->s_map.map_app != NULL) 974 strcat(replac, map->s_map.map_app); 975 if (tTd(60, 1)) 976 printf("%s\n", replac ? replac : "NOT FOUND"); 977 } 978 else 979 replac = NULL; 980 981 /* if no replacement, use default */ 982 if (replac == NULL && default_rvp != NULL) 983 { 984 char buf2[sizeof buf]; 985 986 /* rewrite the default with % translations */ 987 cataddr(default_rvp, NULL, buf2, sizeof buf2, '\0'); 988 map_rewrite(buf2, sizeof buf2, buf, sizeof buf, 989 argvect); 990 replac = buf; 991 } 992 993 if (replac == NULL) 994 { 995 xpvp = key_rvp; 996 } 997 else 998 { 999 /* scan the new replacement */ 1000 xpvp = prescan(replac, '\0', pvpbuf, NULL); 1001 if (xpvp == NULL) 1002 { 1003 /* prescan already printed error */ 1004 return; 1005 } 1006 } 1007 1008 /* append it to the token list */ 1009 for (avp = hbrvp; *xpvp != NULL; xpvp++) 1010 { 1011 *avp++ = newstr(*xpvp); 1012 if (avp >= &npvp[MAXATOM]) 1013 goto toolong; 1014 } 1015 1016 /* restore the old trailing information */ 1017 for (xpvp = pvpb1; (*avp++ = *xpvp++) != NULL; ) 1018 if (avp >= &npvp[MAXATOM]) 1019 goto toolong; 1020 1021 break; 1022 } 1023 1024 /* 1025 ** Check for subroutine calls. 1026 */ 1027 1028 if (*npvp != NULL && (**npvp & 0377) == CALLSUBR) 1029 { 1030 bcopy((char *) &npvp[2], (char *) pvp, 1031 (int) (avp - npvp - 2) * sizeof *avp); 1032 if (tTd(21, 3)) 1033 printf("-----callsubr %s\n", npvp[1]); 1034 rewrite(pvp, atoi(npvp[1])); 1035 } 1036 else 1037 { 1038 bcopy((char *) npvp, (char *) pvp, 1039 (int) (avp - npvp) * sizeof *avp); 1040 } 1041 if (tTd(21, 4)) 1042 { 1043 printf("rewritten as:"); 1044 printav(pvp); 1045 } 1046 } 1047 1048 if (OpMode == MD_TEST || tTd(21, 2)) 1049 { 1050 printf("rewrite: ruleset %2d returns:", ruleset); 1051 printav(pvp); 1052 } 1053 } 1054 /* 1055 ** BUILDADDR -- build address from token vector. 1056 ** 1057 ** Parameters: 1058 ** tv -- token vector. 1059 ** a -- pointer to address descriptor to fill. 1060 ** If NULL, one will be allocated. 1061 ** 1062 ** Returns: 1063 ** NULL if there was an error. 1064 ** 'a' otherwise. 1065 ** 1066 ** Side Effects: 1067 ** fills in 'a' 1068 */ 1069 1070 struct errcodes 1071 { 1072 char *ec_name; /* name of error code */ 1073 int ec_code; /* numeric code */ 1074 } ErrorCodes[] = 1075 { 1076 "usage", EX_USAGE, 1077 "nouser", EX_NOUSER, 1078 "nohost", EX_NOHOST, 1079 "unavailable", EX_UNAVAILABLE, 1080 "software", EX_SOFTWARE, 1081 "tempfail", EX_TEMPFAIL, 1082 "protocol", EX_PROTOCOL, 1083 #ifdef EX_CONFIG 1084 "config", EX_CONFIG, 1085 #endif 1086 NULL, EX_UNAVAILABLE, 1087 }; 1088 1089 ADDRESS * 1090 buildaddr(tv, a) 1091 register char **tv; 1092 register ADDRESS *a; 1093 { 1094 struct mailer **mp; 1095 register struct mailer *m; 1096 char *bp; 1097 int spaceleft; 1098 static char buf[MAXNAME]; 1099 1100 if (a == NULL) 1101 a = (ADDRESS *) xalloc(sizeof *a); 1102 bzero((char *) a, sizeof *a); 1103 1104 /* figure out what net/mailer to use */ 1105 if ((**tv & 0377) != CANONNET) 1106 { 1107 syserr("554 buildaddr: no net"); 1108 return (NULL); 1109 } 1110 tv++; 1111 if (strcasecmp(*tv, "error") == 0) 1112 { 1113 if ((**++tv & 0377) == CANONHOST) 1114 { 1115 register struct errcodes *ep; 1116 1117 if (isascii(**++tv) && isdigit(**tv)) 1118 { 1119 setstat(atoi(*tv)); 1120 } 1121 else 1122 { 1123 for (ep = ErrorCodes; ep->ec_name != NULL; ep++) 1124 if (strcasecmp(ep->ec_name, *tv) == 0) 1125 break; 1126 setstat(ep->ec_code); 1127 } 1128 tv++; 1129 } 1130 if ((**tv & 0377) != CANONUSER) 1131 syserr("554 buildaddr: error: no user"); 1132 cataddr(++tv, NULL, buf, sizeof buf, ' '); 1133 stripquotes(buf); 1134 usrerr(buf); 1135 return (NULL); 1136 } 1137 1138 for (mp = Mailer; (m = *mp++) != NULL; ) 1139 { 1140 if (strcasecmp(m->m_name, *tv) == 0) 1141 break; 1142 } 1143 if (m == NULL) 1144 { 1145 syserr("554 buildaddr: unknown mailer %s", *tv); 1146 return (NULL); 1147 } 1148 a->q_mailer = m; 1149 1150 /* figure out what host (if any) */ 1151 tv++; 1152 if ((**tv & 0377) == CANONHOST) 1153 { 1154 bp = buf; 1155 spaceleft = sizeof buf - 1; 1156 while (*++tv != NULL && (**tv & 0377) != CANONUSER) 1157 { 1158 int i = strlen(*tv); 1159 1160 if (i > spaceleft) 1161 { 1162 /* out of space for this address */ 1163 if (spaceleft >= 0) 1164 syserr("554 buildaddr: host too long (%.40s...)", 1165 buf); 1166 i = spaceleft; 1167 spaceleft = 0; 1168 } 1169 if (i <= 0) 1170 continue; 1171 bcopy(*tv, bp, i); 1172 bp += i; 1173 spaceleft -= i; 1174 } 1175 *bp = '\0'; 1176 a->q_host = newstr(buf); 1177 } 1178 else 1179 { 1180 if (!bitnset(M_LOCALMAILER, m->m_flags)) 1181 { 1182 syserr("554 buildaddr: no host"); 1183 return (NULL); 1184 } 1185 a->q_host = NULL; 1186 } 1187 1188 /* figure out the user */ 1189 if (*tv == NULL || (**tv & 0377) != CANONUSER) 1190 { 1191 syserr("554 buildaddr: no user"); 1192 return (NULL); 1193 } 1194 tv++; 1195 1196 /* do special mapping for local mailer */ 1197 if (m == LocalMailer && *tv != NULL) 1198 { 1199 register char *p = *tv; 1200 1201 if (*p == '"') 1202 p++; 1203 if (*p == '|') 1204 a->q_mailer = m = ProgMailer; 1205 else if (*p == '/') 1206 a->q_mailer = m = FileMailer; 1207 else if (*p == ':') 1208 { 1209 /* may be :include: */ 1210 cataddr(tv, NULL, buf, sizeof buf, '\0'); 1211 stripquotes(buf); 1212 if (strncasecmp(buf, ":include:", 9) == 0) 1213 { 1214 /* if :include:, don't need further rewriting */ 1215 a->q_mailer = m = InclMailer; 1216 a->q_user = &buf[9]; 1217 return (a); 1218 } 1219 } 1220 } 1221 1222 if (m == LocalMailer && *tv != NULL && strcmp(*tv, "@") == 0) 1223 { 1224 tv++; 1225 a->q_flags |= QNOTREMOTE; 1226 } 1227 1228 /* do cleanup of final address */ 1229 rewrite(tv, 4); 1230 1231 /* save the result for the command line/RCPT argument */ 1232 cataddr(tv, NULL, buf, sizeof buf, '\0'); 1233 a->q_user = buf; 1234 1235 /* 1236 ** Do mapping to lower case as requested by mailer 1237 */ 1238 1239 if (a->q_host != NULL && !bitnset(M_HST_UPPER, m->m_flags)) 1240 makelower(a->q_host); 1241 if (!bitnset(M_USR_UPPER, m->m_flags)) 1242 makelower(a->q_user); 1243 1244 return (a); 1245 } 1246 /* 1247 ** CATADDR -- concatenate pieces of addresses (putting in <LWSP> subs) 1248 ** 1249 ** Parameters: 1250 ** pvp -- parameter vector to rebuild. 1251 ** evp -- last parameter to include. Can be NULL to 1252 ** use entire pvp. 1253 ** buf -- buffer to build the string into. 1254 ** sz -- size of buf. 1255 ** spacesub -- the space separator character; if null, 1256 ** use SpaceSub. 1257 ** 1258 ** Returns: 1259 ** none. 1260 ** 1261 ** Side Effects: 1262 ** Destroys buf. 1263 */ 1264 1265 cataddr(pvp, evp, buf, sz, spacesub) 1266 char **pvp; 1267 char **evp; 1268 char *buf; 1269 register int sz; 1270 char spacesub; 1271 { 1272 bool oatomtok = FALSE; 1273 bool natomtok = FALSE; 1274 register int i; 1275 register char *p; 1276 1277 if (spacesub == '\0') 1278 spacesub = SpaceSub; 1279 1280 if (pvp == NULL) 1281 { 1282 (void) strcpy(buf, ""); 1283 return; 1284 } 1285 p = buf; 1286 sz -= 2; 1287 while (*pvp != NULL && (i = strlen(*pvp)) < sz) 1288 { 1289 natomtok = (toktype(**pvp) == ATM); 1290 if (oatomtok && natomtok) 1291 *p++ = spacesub; 1292 (void) strcpy(p, *pvp); 1293 oatomtok = natomtok; 1294 p += i; 1295 sz -= i + 1; 1296 if (pvp++ == evp) 1297 break; 1298 } 1299 *p = '\0'; 1300 } 1301 /* 1302 ** SAMEADDR -- Determine if two addresses are the same 1303 ** 1304 ** This is not just a straight comparison -- if the mailer doesn't 1305 ** care about the host we just ignore it, etc. 1306 ** 1307 ** Parameters: 1308 ** a, b -- pointers to the internal forms to compare. 1309 ** 1310 ** Returns: 1311 ** TRUE -- they represent the same mailbox. 1312 ** FALSE -- they don't. 1313 ** 1314 ** Side Effects: 1315 ** none. 1316 */ 1317 1318 bool 1319 sameaddr(a, b) 1320 register ADDRESS *a; 1321 register ADDRESS *b; 1322 { 1323 /* if they don't have the same mailer, forget it */ 1324 if (a->q_mailer != b->q_mailer) 1325 return (FALSE); 1326 1327 /* if the user isn't the same, we can drop out */ 1328 if (strcmp(a->q_user, b->q_user) != 0) 1329 return (FALSE); 1330 1331 /* if we have good uids for both but the differ, these are different */ 1332 if (bitset(QGOODUID, a->q_flags & b->q_flags) && a->q_uid != b->q_uid) 1333 return (FALSE); 1334 1335 /* otherwise compare hosts (but be careful for NULL ptrs) */ 1336 if (a->q_host == b->q_host) 1337 { 1338 /* probably both null pointers */ 1339 return (TRUE); 1340 } 1341 if (a->q_host == NULL || b->q_host == NULL) 1342 { 1343 /* only one is a null pointer */ 1344 return (FALSE); 1345 } 1346 if (strcmp(a->q_host, b->q_host) != 0) 1347 return (FALSE); 1348 1349 return (TRUE); 1350 } 1351 /* 1352 ** PRINTADDR -- print address (for debugging) 1353 ** 1354 ** Parameters: 1355 ** a -- the address to print 1356 ** follow -- follow the q_next chain. 1357 ** 1358 ** Returns: 1359 ** none. 1360 ** 1361 ** Side Effects: 1362 ** none. 1363 */ 1364 1365 printaddr(a, follow) 1366 register ADDRESS *a; 1367 bool follow; 1368 { 1369 bool first = TRUE; 1370 register MAILER *m; 1371 MAILER pseudomailer; 1372 1373 while (a != NULL) 1374 { 1375 first = FALSE; 1376 printf("%x=", a); 1377 (void) fflush(stdout); 1378 1379 /* find the mailer -- carefully */ 1380 m = a->q_mailer; 1381 if (m == NULL) 1382 { 1383 m = &pseudomailer; 1384 m->m_mno = -1; 1385 m->m_name = "NULL"; 1386 } 1387 1388 printf("%s:\n\tmailer %d (%s), host `%s', user `%s', ruser `%s'\n", 1389 a->q_paddr, m->m_mno, m->m_name, 1390 a->q_host, a->q_user, a->q_ruser? a->q_ruser: "<null>"); 1391 printf("\tnext=%x, flags=%o, alias %x\n", a->q_next, a->q_flags, 1392 a->q_alias); 1393 printf("\thome=\"%s\", fullname=\"%s\"\n", a->q_home, 1394 a->q_fullname); 1395 1396 if (!follow) 1397 return; 1398 a = a->q_next; 1399 } 1400 if (first) 1401 printf("[NULL]\n"); 1402 } 1403 1404 /* 1405 ** REMOTENAME -- return the name relative to the current mailer 1406 ** 1407 ** Parameters: 1408 ** name -- the name to translate. 1409 ** m -- the mailer that we want to do rewriting relative 1410 ** to. 1411 ** senderaddress -- if set, uses the sender rewriting rules 1412 ** rather than the recipient rewriting rules. 1413 ** header -- set if this address is in the header, rather 1414 ** than an envelope header. 1415 ** canonical -- if set, strip out any comment information, 1416 ** etc. 1417 ** adddomain -- if set, OK to do domain extension. 1418 ** e -- the current envelope. 1419 ** 1420 ** Returns: 1421 ** the text string representing this address relative to 1422 ** the receiving mailer. 1423 ** 1424 ** Side Effects: 1425 ** none. 1426 ** 1427 ** Warnings: 1428 ** The text string returned is tucked away locally; 1429 ** copy it if you intend to save it. 1430 */ 1431 1432 char * 1433 remotename(name, m, senderaddress, header, canonical, adddomain, e) 1434 char *name; 1435 struct mailer *m; 1436 bool senderaddress; 1437 bool header; 1438 bool canonical; 1439 bool adddomain; 1440 register ENVELOPE *e; 1441 { 1442 register char **pvp; 1443 char *fancy; 1444 extern char *macvalue(); 1445 char *oldg = macvalue('g', e); 1446 int rwset; 1447 static char buf[MAXNAME]; 1448 char lbuf[MAXNAME]; 1449 char pvpbuf[PSBUFSIZE]; 1450 extern char **prescan(); 1451 extern char *crackaddr(); 1452 1453 if (tTd(12, 1)) 1454 printf("remotename(%s)\n", name); 1455 1456 /* don't do anything if we are tagging it as special */ 1457 if (senderaddress) 1458 rwset = header ? m->m_sh_rwset : m->m_se_rwset; 1459 else 1460 rwset = header ? m->m_rh_rwset : m->m_re_rwset; 1461 if (rwset < 0) 1462 return (name); 1463 1464 /* 1465 ** Do a heuristic crack of this name to extract any comment info. 1466 ** This will leave the name as a comment and a $g macro. 1467 */ 1468 1469 if (canonical || bitnset(M_NOCOMMENT, m->m_flags)) 1470 fancy = "\201g"; 1471 else 1472 fancy = crackaddr(name); 1473 1474 /* 1475 ** Turn the name into canonical form. 1476 ** Normally this will be RFC 822 style, i.e., "user@domain". 1477 ** If this only resolves to "user", and the "C" flag is 1478 ** specified in the sending mailer, then the sender's 1479 ** domain will be appended. 1480 */ 1481 1482 pvp = prescan(name, '\0', pvpbuf, NULL); 1483 if (pvp == NULL) 1484 return (name); 1485 rewrite(pvp, 3); 1486 if (adddomain && e->e_fromdomain != NULL) 1487 { 1488 /* append from domain to this address */ 1489 register char **pxp = pvp; 1490 1491 /* see if there is an "@domain" in the current name */ 1492 while (*pxp != NULL && strcmp(*pxp, "@") != 0) 1493 pxp++; 1494 if (*pxp == NULL) 1495 { 1496 /* no.... append the "@domain" from the sender */ 1497 register char **qxq = e->e_fromdomain; 1498 1499 while ((*pxp++ = *qxq++) != NULL) 1500 continue; 1501 rewrite(pvp, 3); 1502 } 1503 } 1504 1505 /* 1506 ** Do more specific rewriting. 1507 ** Rewrite using ruleset 1 or 2 depending on whether this is 1508 ** a sender address or not. 1509 ** Then run it through any receiving-mailer-specific rulesets. 1510 */ 1511 1512 if (senderaddress) 1513 rewrite(pvp, 1); 1514 else 1515 rewrite(pvp, 2); 1516 if (rwset > 0) 1517 rewrite(pvp, rwset); 1518 1519 /* 1520 ** Do any final sanitation the address may require. 1521 ** This will normally be used to turn internal forms 1522 ** (e.g., user@host.LOCAL) into external form. This 1523 ** may be used as a default to the above rules. 1524 */ 1525 1526 rewrite(pvp, 4); 1527 1528 /* 1529 ** Now restore the comment information we had at the beginning. 1530 */ 1531 1532 cataddr(pvp, NULL, lbuf, sizeof lbuf, '\0'); 1533 define('g', lbuf, e); 1534 expand(fancy, buf, &buf[sizeof buf - 1], e); 1535 define('g', oldg, e); 1536 1537 if (tTd(12, 1)) 1538 printf("remotename => `%s'\n", buf); 1539 return (buf); 1540 } 1541 /* 1542 ** MAPLOCALUSER -- run local username through ruleset 5 for final redirection 1543 ** 1544 ** Parameters: 1545 ** a -- the address to map (but just the user name part). 1546 ** sendq -- the sendq in which to install any replacement 1547 ** addresses. 1548 ** 1549 ** Returns: 1550 ** none. 1551 */ 1552 1553 maplocaluser(a, sendq, e) 1554 register ADDRESS *a; 1555 ADDRESS **sendq; 1556 ENVELOPE *e; 1557 { 1558 register char **pvp; 1559 register ADDRESS *a1 = NULL; 1560 auto char *delimptr; 1561 char pvpbuf[PSBUFSIZE]; 1562 1563 if (tTd(29, 1)) 1564 { 1565 printf("maplocaluser: "); 1566 printaddr(a, FALSE); 1567 } 1568 pvp = prescan(a->q_user, '\0', pvpbuf, &delimptr); 1569 if (pvp == NULL) 1570 return; 1571 1572 rewrite(pvp, 5); 1573 if (pvp[0] == NULL || (pvp[0][0] & 0377) != CANONNET) 1574 return; 1575 1576 /* if non-null, mailer destination specified -- has it changed? */ 1577 a1 = buildaddr(pvp, NULL); 1578 if (a1 == NULL || sameaddr(a, a1)) 1579 return; 1580 1581 /* mark old address as dead; insert new address */ 1582 a->q_flags |= QDONTSEND; 1583 if (tTd(29, 5)) 1584 { 1585 printf("maplocaluser: QDONTSEND "); 1586 printaddr(a, FALSE); 1587 } 1588 a1->q_alias = a; 1589 allocaddr(a1, 1, NULL, delimptr); 1590 (void) recipient(a1, sendq, e); 1591 } 1592 /* 1593 ** DEQUOTE_INIT -- initialize dequote map 1594 ** 1595 ** This is a no-op. 1596 ** 1597 ** Parameters: 1598 ** map -- the internal map structure. 1599 ** mapname -- the name of the mapl. 1600 ** args -- arguments. 1601 ** 1602 ** Returns: 1603 ** TRUE. 1604 */ 1605 1606 bool 1607 dequote_init(map, mapname, args) 1608 MAP *map; 1609 char *mapname; 1610 char *args; 1611 { 1612 register char *p = args; 1613 1614 for (;;) 1615 { 1616 while (isascii(*p) && isspace(*p)) 1617 p++; 1618 if (*p != '-') 1619 break; 1620 switch (*++p) 1621 { 1622 case 'a': 1623 map->map_app = ++p; 1624 break; 1625 } 1626 while (*p != '\0' && !(isascii(*p) && isspace(*p))) 1627 p++; 1628 if (*p != '\0') 1629 *p = '\0'; 1630 } 1631 if (map->map_app != NULL) 1632 map->map_app = newstr(map->map_app); 1633 1634 return TRUE; 1635 } 1636 /* 1637 ** DEQUOTE_MAP -- unquote an address 1638 ** 1639 ** Parameters: 1640 ** map -- the internal map structure (ignored). 1641 ** buf -- the buffer to dequote. 1642 ** bufsiz -- the size of that buffer. 1643 ** av -- arguments (ignored). 1644 ** 1645 ** Returns: 1646 ** NULL -- if there were no quotes, or if the resulting 1647 ** unquoted buffer would not be acceptable to prescan. 1648 ** else -- The dequoted buffer. 1649 */ 1650 1651 char * 1652 dequote_map(map, buf, bufsiz, av) 1653 MAP *map; 1654 char buf[]; 1655 int bufsiz; 1656 char **av; 1657 { 1658 register char *p; 1659 register char *q; 1660 register char c; 1661 int anglecnt; 1662 int cmntcnt; 1663 int quotecnt; 1664 bool quotemode; 1665 bool bslashmode; 1666 1667 anglecnt = 0; 1668 cmntcnt = 0; 1669 quotecnt = 0; 1670 quotemode = FALSE; 1671 bslashmode = FALSE; 1672 1673 for (p = q = buf; (c = *p++) != '\0'; ) 1674 { 1675 if (bslashmode) 1676 { 1677 bslashmode = FALSE; 1678 *q++ = c; 1679 continue; 1680 } 1681 1682 switch (c) 1683 { 1684 case '\\': 1685 bslashmode = TRUE; 1686 break; 1687 1688 case '(': 1689 cmntcnt++; 1690 break; 1691 1692 case ')': 1693 if (cmntcnt-- <= 0) 1694 return NULL; 1695 break; 1696 } 1697 1698 if (cmntcnt > 0) 1699 { 1700 *q++ = c; 1701 continue; 1702 } 1703 1704 switch (c) 1705 { 1706 case '"': 1707 quotemode = !quotemode; 1708 quotecnt++; 1709 continue; 1710 1711 case '<': 1712 anglecnt++; 1713 break; 1714 1715 case '>': 1716 if (anglecnt-- <= 0) 1717 return NULL; 1718 break; 1719 } 1720 *q++ = c; 1721 } 1722 1723 if (anglecnt != 0 || cmntcnt != 0 || bslashmode || 1724 quotemode || quotecnt <= 0) 1725 return NULL; 1726 *q++ = '\0'; 1727 return buf; 1728 } 1729