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 6.33 (Berkeley) 03/26/93"; 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 struct match mlist[MAXMATCH]; /* stores match on LHS */ 578 char *npvp[MAXATOM+1]; /* temporary space for rebuild */ 579 580 if (OpMode == MD_TEST || tTd(21, 2)) 581 { 582 printf("rewrite: ruleset %2d input:", ruleset); 583 printav(pvp); 584 } 585 if (ruleset < 0 || ruleset >= MAXRWSETS) 586 { 587 syserr("554 rewrite: illegal ruleset number %d", ruleset); 588 return; 589 } 590 if (pvp == NULL) 591 return; 592 593 /* 594 ** Run through the list of rewrite rules, applying 595 ** any that match. 596 */ 597 598 for (rwr = RewriteRules[ruleset]; rwr != NULL; ) 599 { 600 int loopcount = 0; 601 602 if (tTd(21, 12)) 603 { 604 printf("-----trying rule:"); 605 printav(rwr->r_lhs); 606 } 607 608 /* try to match on this rule */ 609 mlp = mlist; 610 rvp = rwr->r_lhs; 611 avp = pvp; 612 while ((ap = *avp) != NULL || *rvp != NULL) 613 { 614 if (++loopcount > 100) 615 { 616 syserr("554 Infinite loop in ruleset %d", ruleset); 617 printf("workspace: "); 618 printav(pvp); 619 break; 620 } 621 rp = *rvp; 622 if (tTd(21, 35)) 623 { 624 printf("ADVANCE rp="); 625 xputs(rp); 626 printf(", ap="); 627 xputs(ap); 628 printf("\n"); 629 } 630 if (rp == NULL) 631 { 632 /* end-of-pattern before end-of-address */ 633 goto backup; 634 } 635 if (ap == NULL && (*rp & 0377) != MATCHZANY && 636 (*rp & 0377) != CANONHOST) 637 { 638 /* end-of-input with patterns left */ 639 goto backup; 640 } 641 642 switch (*rp & 0377) 643 { 644 register STAB *s; 645 char buf[MAXLINE]; 646 647 case MATCHCLASS: 648 /* match any phrase in a class */ 649 mlp->pattern = rvp; 650 mlp->first = avp; 651 extendclass: 652 ap = *avp; 653 if (ap == NULL) 654 goto backup; 655 mlp->last = avp++; 656 cataddr(mlp->first, mlp->last, buf, sizeof buf, '\0'); 657 s = stab(buf, ST_CLASS, ST_FIND); 658 if (s == NULL || !bitnset(rp[1], s->s_class)) 659 { 660 if (tTd(21, 36)) 661 { 662 printf("EXTEND rp="); 663 xputs(rp); 664 printf(", ap="); 665 xputs(ap); 666 printf("\n"); 667 } 668 goto extendclass; 669 } 670 if (tTd(21, 36)) 671 printf("CLMATCH\n"); 672 mlp++; 673 break; 674 675 case MATCHNCLASS: 676 /* match any token not in a class */ 677 s = stab(ap, ST_CLASS, ST_FIND); 678 if (s != NULL && bitnset(rp[1], s->s_class)) 679 goto backup; 680 681 /* fall through */ 682 683 case MATCHONE: 684 case MATCHANY: 685 /* match exactly one token */ 686 mlp->pattern = rvp; 687 mlp->first = avp; 688 mlp->last = avp++; 689 mlp++; 690 break; 691 692 case MATCHZANY: 693 /* match zero or more tokens */ 694 mlp->pattern = rvp; 695 mlp->first = avp; 696 mlp->last = avp - 1; 697 mlp++; 698 break; 699 700 case CANONHOST: 701 /* match zero tokens */ 702 break; 703 704 default: 705 /* must have exact match */ 706 if (strcasecmp(rp, ap)) 707 goto backup; 708 avp++; 709 break; 710 } 711 712 /* successful match on this token */ 713 rvp++; 714 continue; 715 716 backup: 717 /* match failed -- back up */ 718 while (--mlp >= mlist) 719 { 720 rvp = mlp->pattern; 721 rp = *rvp; 722 avp = mlp->last + 1; 723 ap = *avp; 724 725 if (tTd(21, 36)) 726 { 727 printf("BACKUP rp="); 728 xputs(rp); 729 printf(", ap="); 730 xputs(ap); 731 printf("\n"); 732 } 733 734 if (ap == NULL) 735 { 736 /* run off the end -- back up again */ 737 continue; 738 } 739 if ((*rp & 0377) == MATCHANY || 740 (*rp & 0377) == MATCHZANY) 741 { 742 /* extend binding and continue */ 743 mlp->last = avp++; 744 rvp++; 745 mlp++; 746 break; 747 } 748 if ((*rp & 0377) == MATCHCLASS) 749 { 750 /* extend binding and try again */ 751 mlp->last = avp++; 752 goto extendclass; 753 } 754 } 755 756 if (mlp < mlist) 757 { 758 /* total failure to match */ 759 break; 760 } 761 } 762 763 /* 764 ** See if we successfully matched 765 */ 766 767 if (rvp < rwr->r_lhs || *rvp != NULL) 768 { 769 if (tTd(21, 10)) 770 printf("----- rule fails\n"); 771 rwr = rwr->r_next; 772 continue; 773 } 774 775 rvp = rwr->r_rhs; 776 if (tTd(21, 12)) 777 { 778 printf("-----rule matches:"); 779 printav(rvp); 780 } 781 782 rp = *rvp; 783 if ((*rp & 0377) == CANONUSER) 784 { 785 rvp++; 786 rwr = rwr->r_next; 787 } 788 else if ((*rp & 0377) == CANONHOST) 789 { 790 rvp++; 791 rwr = NULL; 792 } 793 else if ((*rp & 0377) == CANONNET) 794 rwr = NULL; 795 796 /* substitute */ 797 for (avp = npvp; *rvp != NULL; rvp++) 798 { 799 register struct match *m; 800 register char **pp; 801 802 rp = *rvp; 803 if ((*rp & 0377) == MATCHREPL) 804 { 805 /* substitute from LHS */ 806 m = &mlist[rp[1] - '1']; 807 if (m < mlist || m >= mlp) 808 { 809 syserr("554 rewrite: ruleset %d: replacement $%c out of bounds", 810 ruleset, rp[1]); 811 return; 812 } 813 if (tTd(21, 15)) 814 { 815 printf("$%c:", rp[1]); 816 pp = m->first; 817 while (pp <= m->last) 818 { 819 printf(" %x=\"", *pp); 820 (void) fflush(stdout); 821 printf("%s\"", *pp++); 822 } 823 printf("\n"); 824 } 825 pp = m->first; 826 while (pp <= m->last) 827 { 828 if (avp >= &npvp[MAXATOM]) 829 { 830 syserr("554 rewrite: expansion too long"); 831 return; 832 } 833 *avp++ = *pp++; 834 } 835 } 836 else 837 { 838 /* vanilla replacement */ 839 if (avp >= &npvp[MAXATOM]) 840 { 841 toolong: 842 syserr("554 rewrite: expansion too long"); 843 return; 844 } 845 *avp++ = rp; 846 } 847 } 848 *avp++ = NULL; 849 850 /* 851 ** Check for any hostname/keyword lookups. 852 */ 853 854 for (rvp = npvp; *rvp != NULL; rvp++) 855 { 856 char **hbrvp; 857 char **xpvp; 858 int trsize; 859 char *olddelimchar; 860 char *replac; 861 int endtoken; 862 STAB *map; 863 char *mapname; 864 char **key_rvp; 865 char **arg_rvp; 866 char **default_rvp; 867 char buf[MAXNAME + 1]; 868 char *pvpb1[MAXATOM + 1]; 869 char *argvect[10]; 870 char pvpbuf[PSBUFSIZE]; 871 872 if ((**rvp & 0377) != HOSTBEGIN && 873 (**rvp & 0377) != LOOKUPBEGIN) 874 continue; 875 876 /* 877 ** Got a hostname/keyword lookup. 878 ** 879 ** This could be optimized fairly easily. 880 */ 881 882 hbrvp = rvp; 883 if ((**rvp & 0377) == HOSTBEGIN) 884 { 885 endtoken = HOSTEND; 886 mapname = "host"; 887 } 888 else 889 { 890 endtoken = LOOKUPEND; 891 mapname = *++rvp; 892 } 893 map = stab(mapname, ST_MAP, ST_FIND); 894 if (map == NULL) 895 syserr("554 rewrite: map %s not found", mapname); 896 897 /* extract the match part */ 898 key_rvp = ++rvp; 899 default_rvp = NULL; 900 arg_rvp = argvect; 901 xpvp = NULL; 902 replac = pvpbuf; 903 while (*rvp != NULL && (**rvp & 0377) != endtoken) 904 { 905 int nodetype = **rvp & 0377; 906 907 if (nodetype != CANONHOST && nodetype != CANONUSER) 908 { 909 rvp++; 910 continue; 911 } 912 913 *rvp++ = NULL; 914 915 if (xpvp != NULL) 916 { 917 cataddr(xpvp, NULL, replac, 918 &pvpbuf[sizeof pvpbuf] - replac, 919 '\0'); 920 *++arg_rvp = replac; 921 replac += strlen(replac) + 1; 922 xpvp = NULL; 923 } 924 switch (nodetype) 925 { 926 case CANONHOST: 927 xpvp = rvp; 928 break; 929 930 case CANONUSER: 931 default_rvp = rvp; 932 break; 933 } 934 } 935 if (*rvp != NULL) 936 *rvp++ = NULL; 937 if (xpvp != NULL) 938 { 939 cataddr(xpvp, NULL, replac, 940 &pvpbuf[sizeof pvpbuf] - replac, 941 '\0'); 942 *++arg_rvp = replac; 943 } 944 *++arg_rvp = NULL; 945 946 /* save the remainder of the input string */ 947 trsize = (int) (avp - rvp + 1) * sizeof *rvp; 948 bcopy((char *) rvp, (char *) pvpb1, trsize); 949 950 /* look it up */ 951 cataddr(key_rvp, NULL, buf, sizeof buf, '\0'); 952 argvect[0] = buf; 953 if (map != NULL && bitset(MF_VALID, map->s_map.map_flags)) 954 { 955 int bsize = sizeof buf - 1; 956 957 if (map->s_map.map_app != NULL) 958 bsize -= strlen(map->s_map.map_app); 959 if (tTd(60, 1)) 960 printf("map_lookup(%s, %s) => ", 961 mapname, buf); 962 replac = (*map->s_map.map_class->map_lookup)(&map->s_map, 963 buf, sizeof buf - 1, argvect); 964 if (replac != NULL && map->s_map.map_app != NULL) 965 strcat(replac, map->s_map.map_app); 966 if (tTd(60, 1)) 967 printf("%s\n", replac ? replac : "NOT FOUND"); 968 } 969 else 970 replac = NULL; 971 972 /* if no replacement, use default */ 973 if (replac == NULL && default_rvp != NULL) 974 { 975 char buf2[sizeof buf]; 976 977 /* rewrite the default with % translations */ 978 cataddr(default_rvp, NULL, buf2, sizeof buf2, '\0'); 979 map_rewrite(buf2, sizeof buf2, buf, sizeof buf, 980 argvect); 981 replac = buf; 982 } 983 984 if (replac == NULL) 985 { 986 xpvp = key_rvp; 987 } 988 else 989 { 990 /* scan the new replacement */ 991 xpvp = prescan(replac, '\0', pvpbuf, NULL); 992 if (xpvp == NULL) 993 { 994 /* prescan already printed error */ 995 return; 996 } 997 } 998 999 /* append it to the token list */ 1000 for (avp = hbrvp; *xpvp != NULL; xpvp++) 1001 { 1002 *avp++ = newstr(*xpvp); 1003 if (avp >= &npvp[MAXATOM]) 1004 goto toolong; 1005 } 1006 1007 /* restore the old trailing information */ 1008 for (xpvp = pvpb1; (*avp++ = *xpvp++) != NULL; ) 1009 if (avp >= &npvp[MAXATOM]) 1010 goto toolong; 1011 1012 break; 1013 } 1014 1015 /* 1016 ** Check for subroutine calls. 1017 */ 1018 1019 if (*npvp != NULL && (**npvp & 0377) == CALLSUBR) 1020 { 1021 bcopy((char *) &npvp[2], (char *) pvp, 1022 (int) (avp - npvp - 2) * sizeof *avp); 1023 if (tTd(21, 3)) 1024 printf("-----callsubr %s\n", npvp[1]); 1025 rewrite(pvp, atoi(npvp[1])); 1026 } 1027 else 1028 { 1029 bcopy((char *) npvp, (char *) pvp, 1030 (int) (avp - npvp) * sizeof *avp); 1031 } 1032 if (tTd(21, 4)) 1033 { 1034 printf("rewritten as:"); 1035 printav(pvp); 1036 } 1037 } 1038 1039 if (OpMode == MD_TEST || tTd(21, 2)) 1040 { 1041 printf("rewrite: ruleset %2d returns:", ruleset); 1042 printav(pvp); 1043 } 1044 } 1045 /* 1046 ** BUILDADDR -- build address from token vector. 1047 ** 1048 ** Parameters: 1049 ** tv -- token vector. 1050 ** a -- pointer to address descriptor to fill. 1051 ** If NULL, one will be allocated. 1052 ** 1053 ** Returns: 1054 ** NULL if there was an error. 1055 ** 'a' otherwise. 1056 ** 1057 ** Side Effects: 1058 ** fills in 'a' 1059 */ 1060 1061 struct errcodes 1062 { 1063 char *ec_name; /* name of error code */ 1064 int ec_code; /* numeric code */ 1065 } ErrorCodes[] = 1066 { 1067 "usage", EX_USAGE, 1068 "nouser", EX_NOUSER, 1069 "nohost", EX_NOHOST, 1070 "unavailable", EX_UNAVAILABLE, 1071 "software", EX_SOFTWARE, 1072 "tempfail", EX_TEMPFAIL, 1073 "protocol", EX_PROTOCOL, 1074 #ifdef EX_CONFIG 1075 "config", EX_CONFIG, 1076 #endif 1077 NULL, EX_UNAVAILABLE, 1078 }; 1079 1080 ADDRESS * 1081 buildaddr(tv, a) 1082 register char **tv; 1083 register ADDRESS *a; 1084 { 1085 struct mailer **mp; 1086 register struct mailer *m; 1087 char *bp; 1088 int spaceleft; 1089 static char buf[MAXNAME]; 1090 1091 if (a == NULL) 1092 a = (ADDRESS *) xalloc(sizeof *a); 1093 bzero((char *) a, sizeof *a); 1094 1095 /* figure out what net/mailer to use */ 1096 if ((**tv & 0377) != CANONNET) 1097 { 1098 syserr("554 buildaddr: no net"); 1099 return (NULL); 1100 } 1101 tv++; 1102 if (strcasecmp(*tv, "error") == 0) 1103 { 1104 if ((**++tv & 0377) == CANONHOST) 1105 { 1106 register struct errcodes *ep; 1107 1108 if (isascii(**++tv) && isdigit(**tv)) 1109 { 1110 setstat(atoi(*tv)); 1111 } 1112 else 1113 { 1114 for (ep = ErrorCodes; ep->ec_name != NULL; ep++) 1115 if (strcasecmp(ep->ec_name, *tv) == 0) 1116 break; 1117 setstat(ep->ec_code); 1118 } 1119 tv++; 1120 } 1121 if ((**tv & 0377) != CANONUSER) 1122 syserr("554 buildaddr: error: no user"); 1123 cataddr(++tv, NULL, buf, sizeof buf, ' '); 1124 stripquotes(buf); 1125 usrerr(buf); 1126 return (NULL); 1127 } 1128 1129 for (mp = Mailer; (m = *mp++) != NULL; ) 1130 { 1131 if (strcasecmp(m->m_name, *tv) == 0) 1132 break; 1133 } 1134 if (m == NULL) 1135 { 1136 syserr("554 buildaddr: unknown mailer %s", *tv); 1137 return (NULL); 1138 } 1139 a->q_mailer = m; 1140 1141 /* figure out what host (if any) */ 1142 tv++; 1143 if ((**tv & 0377) == CANONHOST) 1144 { 1145 bp = buf; 1146 spaceleft = sizeof buf - 1; 1147 while (*++tv != NULL && (**tv & 0377) != CANONUSER) 1148 { 1149 int i = strlen(*tv); 1150 1151 if (i > spaceleft) 1152 { 1153 /* out of space for this address */ 1154 if (spaceleft >= 0) 1155 syserr("554 buildaddr: host too long (%.40s...)", 1156 buf); 1157 i = spaceleft; 1158 spaceleft = 0; 1159 } 1160 if (i <= 0) 1161 continue; 1162 bcopy(*tv, bp, i); 1163 bp += i; 1164 spaceleft -= i; 1165 } 1166 *bp = '\0'; 1167 a->q_host = newstr(buf); 1168 } 1169 else 1170 { 1171 if (!bitnset(M_LOCALMAILER, m->m_flags)) 1172 { 1173 syserr("554 buildaddr: no host"); 1174 return (NULL); 1175 } 1176 a->q_host = NULL; 1177 } 1178 1179 /* figure out the user */ 1180 if (*tv == NULL || (**tv & 0377) != CANONUSER) 1181 { 1182 syserr("554 buildaddr: no user"); 1183 return (NULL); 1184 } 1185 tv++; 1186 1187 /* do special mapping for local mailer */ 1188 if (m == LocalMailer && *tv != NULL) 1189 { 1190 register char *p = *tv; 1191 1192 if (*p == '"') 1193 p++; 1194 if (*p == '|') 1195 a->q_mailer = m = ProgMailer; 1196 else if (*p == '/') 1197 a->q_mailer = m = FileMailer; 1198 else if (*p == ':') 1199 { 1200 /* may be :include: */ 1201 cataddr(tv, NULL, buf, sizeof buf, '\0'); 1202 stripquotes(buf); 1203 if (strncasecmp(buf, ":include:", 9) == 0) 1204 { 1205 /* if :include:, don't need further rewriting */ 1206 a->q_mailer = m = InclMailer; 1207 a->q_user = &buf[9]; 1208 return (a); 1209 } 1210 } 1211 } 1212 1213 if (m == LocalMailer && *tv != NULL && strcmp(*tv, "@") == 0) 1214 { 1215 tv++; 1216 a->q_flags |= QNOTREMOTE; 1217 } 1218 1219 /* do cleanup of final address */ 1220 rewrite(tv, 4); 1221 1222 /* save the result for the command line/RCPT argument */ 1223 cataddr(tv, NULL, buf, sizeof buf, '\0'); 1224 a->q_user = buf; 1225 1226 /* 1227 ** Do mapping to lower case as requested by mailer 1228 */ 1229 1230 if (a->q_host != NULL && !bitnset(M_HST_UPPER, m->m_flags)) 1231 makelower(a->q_host); 1232 if (!bitnset(M_USR_UPPER, m->m_flags)) 1233 makelower(a->q_user); 1234 1235 return (a); 1236 } 1237 /* 1238 ** CATADDR -- concatenate pieces of addresses (putting in <LWSP> subs) 1239 ** 1240 ** Parameters: 1241 ** pvp -- parameter vector to rebuild. 1242 ** evp -- last parameter to include. Can be NULL to 1243 ** use entire pvp. 1244 ** buf -- buffer to build the string into. 1245 ** sz -- size of buf. 1246 ** spacesub -- the space separator character; if null, 1247 ** use SpaceSub. 1248 ** 1249 ** Returns: 1250 ** none. 1251 ** 1252 ** Side Effects: 1253 ** Destroys buf. 1254 */ 1255 1256 cataddr(pvp, evp, buf, sz, spacesub) 1257 char **pvp; 1258 char **evp; 1259 char *buf; 1260 register int sz; 1261 char spacesub; 1262 { 1263 bool oatomtok = FALSE; 1264 bool natomtok = FALSE; 1265 register int i; 1266 register char *p; 1267 1268 if (spacesub == '\0') 1269 spacesub = SpaceSub; 1270 1271 if (pvp == NULL) 1272 { 1273 (void) strcpy(buf, ""); 1274 return; 1275 } 1276 p = buf; 1277 sz -= 2; 1278 while (*pvp != NULL && (i = strlen(*pvp)) < sz) 1279 { 1280 natomtok = (toktype(**pvp) == ATM); 1281 if (oatomtok && natomtok) 1282 *p++ = spacesub; 1283 (void) strcpy(p, *pvp); 1284 oatomtok = natomtok; 1285 p += i; 1286 sz -= i + 1; 1287 if (pvp++ == evp) 1288 break; 1289 } 1290 *p = '\0'; 1291 } 1292 /* 1293 ** SAMEADDR -- Determine if two addresses are the same 1294 ** 1295 ** This is not just a straight comparison -- if the mailer doesn't 1296 ** care about the host we just ignore it, etc. 1297 ** 1298 ** Parameters: 1299 ** a, b -- pointers to the internal forms to compare. 1300 ** 1301 ** Returns: 1302 ** TRUE -- they represent the same mailbox. 1303 ** FALSE -- they don't. 1304 ** 1305 ** Side Effects: 1306 ** none. 1307 */ 1308 1309 bool 1310 sameaddr(a, b) 1311 register ADDRESS *a; 1312 register ADDRESS *b; 1313 { 1314 /* if they don't have the same mailer, forget it */ 1315 if (a->q_mailer != b->q_mailer) 1316 return (FALSE); 1317 1318 /* if the user isn't the same, we can drop out */ 1319 if (strcmp(a->q_user, b->q_user) != 0) 1320 return (FALSE); 1321 1322 /* if we have good uids for both but the differ, these are different */ 1323 if (bitset(QGOODUID, a->q_flags & b->q_flags) && a->q_uid != b->q_uid) 1324 return (FALSE); 1325 1326 /* otherwise compare hosts (but be careful for NULL ptrs) */ 1327 if (a->q_host == b->q_host) 1328 { 1329 /* probably both null pointers */ 1330 return (TRUE); 1331 } 1332 if (a->q_host == NULL || b->q_host == NULL) 1333 { 1334 /* only one is a null pointer */ 1335 return (FALSE); 1336 } 1337 if (strcmp(a->q_host, b->q_host) != 0) 1338 return (FALSE); 1339 1340 return (TRUE); 1341 } 1342 /* 1343 ** PRINTADDR -- print address (for debugging) 1344 ** 1345 ** Parameters: 1346 ** a -- the address to print 1347 ** follow -- follow the q_next chain. 1348 ** 1349 ** Returns: 1350 ** none. 1351 ** 1352 ** Side Effects: 1353 ** none. 1354 */ 1355 1356 printaddr(a, follow) 1357 register ADDRESS *a; 1358 bool follow; 1359 { 1360 bool first = TRUE; 1361 register MAILER *m; 1362 MAILER pseudomailer; 1363 1364 while (a != NULL) 1365 { 1366 first = FALSE; 1367 printf("%x=", a); 1368 (void) fflush(stdout); 1369 1370 /* find the mailer -- carefully */ 1371 m = a->q_mailer; 1372 if (m == NULL) 1373 { 1374 m = &pseudomailer; 1375 m->m_mno = -1; 1376 m->m_name = "NULL"; 1377 } 1378 1379 printf("%s:\n\tmailer %d (%s), host `%s', user `%s', ruser `%s'\n", 1380 a->q_paddr, m->m_mno, m->m_name, 1381 a->q_host, a->q_user, a->q_ruser? a->q_ruser: "<null>"); 1382 printf("\tnext=%x, flags=%o, alias %x\n", a->q_next, a->q_flags, 1383 a->q_alias); 1384 printf("\thome=\"%s\", fullname=\"%s\"\n", a->q_home, 1385 a->q_fullname); 1386 1387 if (!follow) 1388 return; 1389 a = a->q_next; 1390 } 1391 if (first) 1392 printf("[NULL]\n"); 1393 } 1394 1395 /* 1396 ** REMOTENAME -- return the name relative to the current mailer 1397 ** 1398 ** Parameters: 1399 ** name -- the name to translate. 1400 ** m -- the mailer that we want to do rewriting relative 1401 ** to. 1402 ** senderaddress -- if set, uses the sender rewriting rules 1403 ** rather than the recipient rewriting rules. 1404 ** header -- set if this address is in the header, rather 1405 ** than an envelope header. 1406 ** canonical -- if set, strip out any comment information, 1407 ** etc. 1408 ** adddomain -- if set, OK to do domain extension. 1409 ** e -- the current envelope. 1410 ** 1411 ** Returns: 1412 ** the text string representing this address relative to 1413 ** the receiving mailer. 1414 ** 1415 ** Side Effects: 1416 ** none. 1417 ** 1418 ** Warnings: 1419 ** The text string returned is tucked away locally; 1420 ** copy it if you intend to save it. 1421 */ 1422 1423 char * 1424 remotename(name, m, senderaddress, header, canonical, adddomain, e) 1425 char *name; 1426 struct mailer *m; 1427 bool senderaddress; 1428 bool header; 1429 bool canonical; 1430 bool adddomain; 1431 register ENVELOPE *e; 1432 { 1433 register char **pvp; 1434 char *fancy; 1435 extern char *macvalue(); 1436 char *oldg = macvalue('g', e); 1437 int rwset; 1438 static char buf[MAXNAME]; 1439 char lbuf[MAXNAME]; 1440 char pvpbuf[PSBUFSIZE]; 1441 extern char **prescan(); 1442 extern char *crackaddr(); 1443 1444 if (tTd(12, 1)) 1445 printf("remotename(%s)\n", name); 1446 1447 /* don't do anything if we are tagging it as special */ 1448 if (senderaddress) 1449 rwset = header ? m->m_sh_rwset : m->m_se_rwset; 1450 else 1451 rwset = header ? m->m_rh_rwset : m->m_re_rwset; 1452 if (rwset < 0) 1453 return (name); 1454 1455 /* 1456 ** Do a heuristic crack of this name to extract any comment info. 1457 ** This will leave the name as a comment and a $g macro. 1458 */ 1459 1460 if (canonical || bitnset(M_NOCOMMENT, m->m_flags)) 1461 fancy = "\201g"; 1462 else 1463 fancy = crackaddr(name); 1464 1465 /* 1466 ** Turn the name into canonical form. 1467 ** Normally this will be RFC 822 style, i.e., "user@domain". 1468 ** If this only resolves to "user", and the "C" flag is 1469 ** specified in the sending mailer, then the sender's 1470 ** domain will be appended. 1471 */ 1472 1473 pvp = prescan(name, '\0', pvpbuf, NULL); 1474 if (pvp == NULL) 1475 return (name); 1476 rewrite(pvp, 3); 1477 if (adddomain && e->e_fromdomain != NULL) 1478 { 1479 /* append from domain to this address */ 1480 register char **pxp = pvp; 1481 1482 /* see if there is an "@domain" in the current name */ 1483 while (*pxp != NULL && strcmp(*pxp, "@") != 0) 1484 pxp++; 1485 if (*pxp == NULL) 1486 { 1487 /* no.... append the "@domain" from the sender */ 1488 register char **qxq = e->e_fromdomain; 1489 1490 while ((*pxp++ = *qxq++) != NULL) 1491 continue; 1492 rewrite(pvp, 3); 1493 } 1494 } 1495 1496 /* 1497 ** Do more specific rewriting. 1498 ** Rewrite using ruleset 1 or 2 depending on whether this is 1499 ** a sender address or not. 1500 ** Then run it through any receiving-mailer-specific rulesets. 1501 */ 1502 1503 if (senderaddress) 1504 rewrite(pvp, 1); 1505 else 1506 rewrite(pvp, 2); 1507 if (rwset > 0) 1508 rewrite(pvp, rwset); 1509 1510 /* 1511 ** Do any final sanitation the address may require. 1512 ** This will normally be used to turn internal forms 1513 ** (e.g., user@host.LOCAL) into external form. This 1514 ** may be used as a default to the above rules. 1515 */ 1516 1517 rewrite(pvp, 4); 1518 1519 /* 1520 ** Now restore the comment information we had at the beginning. 1521 */ 1522 1523 cataddr(pvp, NULL, lbuf, sizeof lbuf, '\0'); 1524 define('g', lbuf, e); 1525 expand(fancy, buf, &buf[sizeof buf - 1], e); 1526 define('g', oldg, e); 1527 1528 if (tTd(12, 1)) 1529 printf("remotename => `%s'\n", buf); 1530 return (buf); 1531 } 1532 /* 1533 ** MAPLOCALUSER -- run local username through ruleset 5 for final redirection 1534 ** 1535 ** Parameters: 1536 ** a -- the address to map (but just the user name part). 1537 ** sendq -- the sendq in which to install any replacement 1538 ** addresses. 1539 ** 1540 ** Returns: 1541 ** none. 1542 */ 1543 1544 maplocaluser(a, sendq, e) 1545 register ADDRESS *a; 1546 ADDRESS **sendq; 1547 ENVELOPE *e; 1548 { 1549 register char **pvp; 1550 register ADDRESS *a1 = NULL; 1551 auto char *delimptr; 1552 char pvpbuf[PSBUFSIZE]; 1553 1554 if (tTd(29, 1)) 1555 { 1556 printf("maplocaluser: "); 1557 printaddr(a, FALSE); 1558 } 1559 pvp = prescan(a->q_user, '\0', pvpbuf, &delimptr); 1560 if (pvp == NULL) 1561 return; 1562 1563 rewrite(pvp, 5); 1564 if (pvp[0] == NULL || (pvp[0][0] & 0377) != CANONNET) 1565 return; 1566 1567 /* if non-null, mailer destination specified -- has it changed? */ 1568 a1 = buildaddr(pvp, NULL); 1569 if (a1 == NULL || sameaddr(a, a1)) 1570 return; 1571 1572 /* mark old address as dead; insert new address */ 1573 a->q_flags |= QDONTSEND; 1574 if (tTd(29, 5)) 1575 { 1576 printf("maplocaluser: QDONTSEND "); 1577 printaddr(a, FALSE); 1578 } 1579 a1->q_alias = a; 1580 allocaddr(a1, 1, NULL, delimptr); 1581 (void) recipient(a1, sendq, e); 1582 } 1583 /* 1584 ** DEQUOTE_INIT -- initialize dequote map 1585 ** 1586 ** This is a no-op. 1587 ** 1588 ** Parameters: 1589 ** map -- the internal map structure. 1590 ** mapname -- the name of the mapl. 1591 ** args -- arguments. 1592 ** 1593 ** Returns: 1594 ** TRUE. 1595 */ 1596 1597 bool 1598 dequote_init(map, mapname, args) 1599 MAP *map; 1600 char *mapname; 1601 char *args; 1602 { 1603 register char *p = args; 1604 1605 for (;;) 1606 { 1607 while (isascii(*p) && isspace(*p)) 1608 p++; 1609 if (*p != '-') 1610 break; 1611 switch (*++p) 1612 { 1613 case 'a': 1614 map->map_app = ++p; 1615 break; 1616 } 1617 while (*p != '\0' && !(isascii(*p) && isspace(*p))) 1618 p++; 1619 if (*p != '\0') 1620 *p = '\0'; 1621 } 1622 if (map->map_app != NULL) 1623 map->map_app = newstr(map->map_app); 1624 1625 return TRUE; 1626 } 1627 /* 1628 ** DEQUOTE_MAP -- unquote an address 1629 ** 1630 ** Parameters: 1631 ** map -- the internal map structure (ignored). 1632 ** buf -- the buffer to dequote. 1633 ** bufsiz -- the size of that buffer. 1634 ** av -- arguments (ignored). 1635 ** 1636 ** Returns: 1637 ** NULL -- if there were no quotes, or if the resulting 1638 ** unquoted buffer would not be acceptable to prescan. 1639 ** else -- The dequoted buffer. 1640 */ 1641 1642 char * 1643 dequote_map(map, buf, bufsiz, av) 1644 MAP *map; 1645 char buf[]; 1646 int bufsiz; 1647 char **av; 1648 { 1649 register char *p; 1650 register char *q; 1651 register char c; 1652 int anglecnt; 1653 int cmntcnt; 1654 int quotecnt; 1655 bool quotemode; 1656 bool bslashmode; 1657 1658 anglecnt = 0; 1659 cmntcnt = 0; 1660 quotecnt = 0; 1661 quotemode = FALSE; 1662 bslashmode = FALSE; 1663 1664 for (p = q = buf; (c = *p++) != '\0'; ) 1665 { 1666 if (bslashmode) 1667 { 1668 bslashmode = FALSE; 1669 *q++ = c; 1670 continue; 1671 } 1672 1673 switch (c) 1674 { 1675 case '\\': 1676 bslashmode = TRUE; 1677 break; 1678 1679 case '(': 1680 cmntcnt++; 1681 break; 1682 1683 case ')': 1684 if (cmntcnt-- <= 0) 1685 return NULL; 1686 break; 1687 } 1688 1689 if (cmntcnt > 0) 1690 { 1691 *q++ = c; 1692 continue; 1693 } 1694 1695 switch (c) 1696 { 1697 case '"': 1698 quotemode = !quotemode; 1699 quotecnt++; 1700 continue; 1701 1702 case '<': 1703 anglecnt++; 1704 break; 1705 1706 case '>': 1707 if (anglecnt-- <= 0) 1708 return NULL; 1709 break; 1710 } 1711 *q++ = c; 1712 } 1713 1714 if (anglecnt != 0 || cmntcnt != 0 || bslashmode || 1715 quotemode || quotecnt <= 0) 1716 return NULL; 1717 *q++ = '\0'; 1718 return buf; 1719 } 1720