1 /* 2 * Copyright (c) 1983, 1995 Eric P. Allman 3 * Copyright (c) 1988, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * %sccs.include.redist.c% 7 */ 8 9 #ifndef lint 10 static char sccsid[] = "@(#)util.c 8.76 (Berkeley) 06/13/95"; 11 #endif /* not lint */ 12 13 # include "sendmail.h" 14 # include <sysexits.h> 15 /* 16 ** STRIPQUOTES -- Strip quotes & quote bits from a string. 17 ** 18 ** Runs through a string and strips off unquoted quote 19 ** characters and quote bits. This is done in place. 20 ** 21 ** Parameters: 22 ** s -- the string to strip. 23 ** 24 ** Returns: 25 ** none. 26 ** 27 ** Side Effects: 28 ** none. 29 ** 30 ** Called By: 31 ** deliver 32 */ 33 34 void 35 stripquotes(s) 36 char *s; 37 { 38 register char *p; 39 register char *q; 40 register char c; 41 42 if (s == NULL) 43 return; 44 45 p = q = s; 46 do 47 { 48 c = *p++; 49 if (c == '\\') 50 c = *p++; 51 else if (c == '"') 52 continue; 53 *q++ = c; 54 } while (c != '\0'); 55 } 56 /* 57 ** XALLOC -- Allocate memory and bitch wildly on failure. 58 ** 59 ** THIS IS A CLUDGE. This should be made to give a proper 60 ** error -- but after all, what can we do? 61 ** 62 ** Parameters: 63 ** sz -- size of area to allocate. 64 ** 65 ** Returns: 66 ** pointer to data region. 67 ** 68 ** Side Effects: 69 ** Memory is allocated. 70 */ 71 72 char * 73 xalloc(sz) 74 register int sz; 75 { 76 register char *p; 77 78 /* some systems can't handle size zero mallocs */ 79 if (sz <= 0) 80 sz = 1; 81 82 p = malloc((unsigned) sz); 83 if (p == NULL) 84 { 85 syserr("!Out of memory!!"); 86 /* exit(EX_UNAVAILABLE); */ 87 } 88 return (p); 89 } 90 /* 91 ** COPYPLIST -- copy list of pointers. 92 ** 93 ** This routine is the equivalent of newstr for lists of 94 ** pointers. 95 ** 96 ** Parameters: 97 ** list -- list of pointers to copy. 98 ** Must be NULL terminated. 99 ** copycont -- if TRUE, copy the contents of the vector 100 ** (which must be a string) also. 101 ** 102 ** Returns: 103 ** a copy of 'list'. 104 ** 105 ** Side Effects: 106 ** none. 107 */ 108 109 char ** 110 copyplist(list, copycont) 111 char **list; 112 bool copycont; 113 { 114 register char **vp; 115 register char **newvp; 116 117 for (vp = list; *vp != NULL; vp++) 118 continue; 119 120 vp++; 121 122 newvp = (char **) xalloc((int) (vp - list) * sizeof *vp); 123 bcopy((char *) list, (char *) newvp, (int) (vp - list) * sizeof *vp); 124 125 if (copycont) 126 { 127 for (vp = newvp; *vp != NULL; vp++) 128 *vp = newstr(*vp); 129 } 130 131 return (newvp); 132 } 133 /* 134 ** COPYQUEUE -- copy address queue. 135 ** 136 ** This routine is the equivalent of newstr for address queues 137 ** addresses marked with QDONTSEND aren't copied 138 ** 139 ** Parameters: 140 ** addr -- list of address structures to copy. 141 ** 142 ** Returns: 143 ** a copy of 'addr'. 144 ** 145 ** Side Effects: 146 ** none. 147 */ 148 149 ADDRESS * 150 copyqueue(addr) 151 ADDRESS *addr; 152 { 153 register ADDRESS *newaddr; 154 ADDRESS *ret; 155 register ADDRESS **tail = &ret; 156 157 while (addr != NULL) 158 { 159 if (!bitset(QDONTSEND, addr->q_flags)) 160 { 161 newaddr = (ADDRESS *) xalloc(sizeof(ADDRESS)); 162 STRUCTCOPY(*addr, *newaddr); 163 *tail = newaddr; 164 tail = &newaddr->q_next; 165 } 166 addr = addr->q_next; 167 } 168 *tail = NULL; 169 170 return ret; 171 } 172 /* 173 ** PRINTAV -- print argument vector. 174 ** 175 ** Parameters: 176 ** av -- argument vector. 177 ** 178 ** Returns: 179 ** none. 180 ** 181 ** Side Effects: 182 ** prints av. 183 */ 184 185 void 186 printav(av) 187 register char **av; 188 { 189 while (*av != NULL) 190 { 191 if (tTd(0, 44)) 192 printf("\n\t%08x=", *av); 193 else 194 (void) putchar(' '); 195 xputs(*av++); 196 } 197 (void) putchar('\n'); 198 } 199 /* 200 ** LOWER -- turn letter into lower case. 201 ** 202 ** Parameters: 203 ** c -- character to turn into lower case. 204 ** 205 ** Returns: 206 ** c, in lower case. 207 ** 208 ** Side Effects: 209 ** none. 210 */ 211 212 char 213 lower(c) 214 register char c; 215 { 216 return((isascii(c) && isupper(c)) ? tolower(c) : c); 217 } 218 /* 219 ** XPUTS -- put string doing control escapes. 220 ** 221 ** Parameters: 222 ** s -- string to put. 223 ** 224 ** Returns: 225 ** none. 226 ** 227 ** Side Effects: 228 ** output to stdout 229 */ 230 231 void 232 xputs(s) 233 register const char *s; 234 { 235 register int c; 236 register struct metamac *mp; 237 extern struct metamac MetaMacros[]; 238 239 if (s == NULL) 240 { 241 printf("<null>"); 242 return; 243 } 244 while ((c = (*s++ & 0377)) != '\0') 245 { 246 if (!isascii(c)) 247 { 248 if (c == MATCHREPL) 249 { 250 putchar('$'); 251 continue; 252 } 253 if (c == MACROEXPAND) 254 { 255 putchar('$'); 256 if (bitset(0200, *s)) 257 printf("{%s}", macname(*s++ & 0377)); 258 continue; 259 } 260 for (mp = MetaMacros; mp->metaname != '\0'; mp++) 261 { 262 if ((mp->metaval & 0377) == c) 263 { 264 printf("$%c", mp->metaname); 265 break; 266 } 267 } 268 if (mp->metaname != '\0') 269 continue; 270 (void) putchar('\\'); 271 c &= 0177; 272 } 273 if (isprint(c)) 274 { 275 putchar(c); 276 continue; 277 } 278 279 /* wasn't a meta-macro -- find another way to print it */ 280 switch (c) 281 { 282 case '\n': 283 c = 'n'; 284 break; 285 286 case '\r': 287 c = 'r'; 288 break; 289 290 case '\t': 291 c = 't'; 292 break; 293 294 default: 295 (void) putchar('^'); 296 (void) putchar(c ^ 0100); 297 continue; 298 } 299 (void) putchar('\\'); 300 (void) putchar(c); 301 } 302 (void) fflush(stdout); 303 } 304 /* 305 ** MAKELOWER -- Translate a line into lower case 306 ** 307 ** Parameters: 308 ** p -- the string to translate. If NULL, return is 309 ** immediate. 310 ** 311 ** Returns: 312 ** none. 313 ** 314 ** Side Effects: 315 ** String pointed to by p is translated to lower case. 316 ** 317 ** Called By: 318 ** parse 319 */ 320 321 void 322 makelower(p) 323 register char *p; 324 { 325 register char c; 326 327 if (p == NULL) 328 return; 329 for (; (c = *p) != '\0'; p++) 330 if (isascii(c) && isupper(c)) 331 *p = tolower(c); 332 } 333 /* 334 ** BUILDFNAME -- build full name from gecos style entry. 335 ** 336 ** This routine interprets the strange entry that would appear 337 ** in the GECOS field of the password file. 338 ** 339 ** Parameters: 340 ** p -- name to build. 341 ** login -- the login name of this user (for &). 342 ** buf -- place to put the result. 343 ** 344 ** Returns: 345 ** none. 346 ** 347 ** Side Effects: 348 ** none. 349 */ 350 351 void 352 buildfname(gecos, login, buf) 353 register char *gecos; 354 char *login; 355 char *buf; 356 { 357 register char *p; 358 register char *bp = buf; 359 int l; 360 361 if (*gecos == '*') 362 gecos++; 363 364 /* find length of final string */ 365 l = 0; 366 for (p = gecos; *p != '\0' && *p != ',' && *p != ';' && *p != '%'; p++) 367 { 368 if (*p == '&') 369 l += strlen(login); 370 else 371 l++; 372 } 373 374 /* now fill in buf */ 375 for (p = gecos; *p != '\0' && *p != ',' && *p != ';' && *p != '%'; p++) 376 { 377 if (*p == '&') 378 { 379 (void) strcpy(bp, login); 380 *bp = toupper(*bp); 381 while (*bp != '\0') 382 bp++; 383 } 384 else 385 *bp++ = *p; 386 } 387 *bp = '\0'; 388 } 389 /* 390 ** SAFEFILE -- return true if a file exists and is safe for a user. 391 ** 392 ** Parameters: 393 ** fn -- filename to check. 394 ** uid -- user id to compare against. 395 ** gid -- group id to compare against. 396 ** uname -- user name to compare against (used for group 397 ** sets). 398 ** flags -- modifiers: 399 ** SFF_MUSTOWN -- "uid" must own this file. 400 ** SFF_NOSLINK -- file cannot be a symbolic link. 401 ** mode -- mode bits that must match. 402 ** st -- if set, points to a stat structure that will 403 ** get the stat info for the file. 404 ** 405 ** Returns: 406 ** 0 if fn exists, is owned by uid, and matches mode. 407 ** An errno otherwise. The actual errno is cleared. 408 ** 409 ** Side Effects: 410 ** none. 411 */ 412 413 #include <grp.h> 414 415 #ifndef S_IXOTH 416 # define S_IXOTH (S_IEXEC >> 6) 417 #endif 418 419 #ifndef S_IXGRP 420 # define S_IXGRP (S_IEXEC >> 3) 421 #endif 422 423 #ifndef S_IXUSR 424 # define S_IXUSR (S_IEXEC) 425 #endif 426 427 #define ST_MODE_NOFILE 0171147 /* unlikely to occur */ 428 429 int 430 safefile(fn, uid, gid, uname, flags, mode, st) 431 char *fn; 432 uid_t uid; 433 gid_t gid; 434 char *uname; 435 int flags; 436 int mode; 437 struct stat *st; 438 { 439 register char *p; 440 register struct group *gr = NULL; 441 struct stat stbuf; 442 443 if (tTd(54, 4)) 444 printf("safefile(%s, uid=%d, gid=%d, flags=%x, mode=%o):\n", 445 fn, uid, gid, flags, mode); 446 errno = 0; 447 if (st == NULL) 448 st = &stbuf; 449 450 if (!bitset(SFF_NOPATHCHECK, flags) || 451 (uid == 0 && !bitset(SFF_ROOTOK, flags))) 452 { 453 /* check the path to the file for acceptability */ 454 for (p = fn; (p = strchr(++p, '/')) != NULL; *p = '/') 455 { 456 *p = '\0'; 457 if (stat(fn, &stbuf) < 0) 458 break; 459 if (uid == 0 && bitset(S_IWGRP|S_IWOTH, stbuf.st_mode)) 460 message("051 WARNING: writable directory %s", 461 fn); 462 if (uid == 0 && !bitset(SFF_ROOTOK, flags)) 463 { 464 if (bitset(S_IXOTH, stbuf.st_mode)) 465 continue; 466 break; 467 } 468 if (stbuf.st_uid == uid && 469 bitset(S_IXUSR, stbuf.st_mode)) 470 continue; 471 if (stbuf.st_gid == gid && 472 bitset(S_IXGRP, stbuf.st_mode)) 473 continue; 474 #ifndef NO_GROUP_SET 475 if (uname != NULL && 476 ((gr != NULL && gr->gr_gid == stbuf.st_gid) || 477 (gr = getgrgid(stbuf.st_gid)) != NULL)) 478 { 479 register char **gp; 480 481 for (gp = gr->gr_mem; gp != NULL && *gp != NULL; gp++) 482 if (strcmp(*gp, uname) == 0) 483 break; 484 if (gp != NULL && *gp != NULL && 485 bitset(S_IXGRP, stbuf.st_mode)) 486 continue; 487 } 488 #endif 489 if (!bitset(S_IXOTH, stbuf.st_mode)) 490 break; 491 } 492 if (p != NULL) 493 { 494 int ret = errno; 495 496 if (ret == 0) 497 ret = EACCES; 498 if (tTd(54, 4)) 499 printf("\t[dir %s] %s\n", fn, errstring(ret)); 500 *p = '/'; 501 return ret; 502 } 503 } 504 505 #ifdef HASLSTAT 506 if ((bitset(SFF_NOSLINK, flags) ? lstat(fn, st) 507 : stat(fn, st)) < 0) 508 #else 509 if (stat(fn, st) < 0) 510 #endif 511 { 512 int ret = errno; 513 514 if (tTd(54, 4)) 515 printf("\t%s\n", errstring(ret)); 516 517 errno = 0; 518 if (!bitset(SFF_CREAT, flags)) 519 return ret; 520 521 /* check to see if legal to create the file */ 522 p = strrchr(fn, '/'); 523 if (p == NULL) 524 return ENOTDIR; 525 *p = '\0'; 526 if (stat(fn, &stbuf) >= 0) 527 { 528 int md = S_IWRITE|S_IEXEC; 529 if (stbuf.st_uid != uid) 530 md >>= 6; 531 if ((stbuf.st_mode & md) != md) 532 errno = EACCES; 533 } 534 ret = errno; 535 if (tTd(54, 4)) 536 printf("\t[final dir %s uid %d mode %o] %s\n", 537 fn, stbuf.st_uid, stbuf.st_mode, 538 errstring(ret)); 539 *p = '/'; 540 st->st_mode = ST_MODE_NOFILE; 541 return ret; 542 } 543 544 #ifdef S_ISLNK 545 if (bitset(SFF_NOSLINK, flags) && S_ISLNK(st->st_mode)) 546 { 547 if (tTd(54, 4)) 548 printf("\t[slink mode %o]\tEPERM\n", st->st_mode); 549 return EPERM; 550 } 551 #endif 552 if (bitset(SFF_REGONLY, flags) && !S_ISREG(st->st_mode)) 553 { 554 if (tTd(54, 4)) 555 printf("\t[non-reg mode %o]\tEPERM\n", st->st_mode); 556 return EPERM; 557 } 558 if (bitset(S_IWUSR|S_IWGRP|S_IWOTH, mode) && bitset(0111, st->st_mode)) 559 { 560 if (tTd(29, 5)) 561 printf("failed (mode %o: x bits)\n", st->st_mode); 562 return EPERM; 563 } 564 565 if (bitset(SFF_SETUIDOK, flags)) 566 { 567 if (bitset(S_ISUID, st->st_mode) && 568 (st->st_uid != 0 || bitset(SFF_ROOTOK, flags))) 569 { 570 uid = st->st_uid; 571 uname = NULL; 572 } 573 if (bitset(S_ISGID, st->st_mode) && 574 (st->st_gid != 0 || bitset(SFF_ROOTOK, flags))) 575 gid = st->st_gid; 576 } 577 578 if (uid == 0 && !bitset(SFF_ROOTOK, flags)) 579 mode >>= 6; 580 else if (st->st_uid != uid) 581 { 582 mode >>= 3; 583 if (st->st_gid == gid) 584 ; 585 #ifndef NO_GROUP_SET 586 else if (uname != NULL && 587 ((gr != NULL && gr->gr_gid == st->st_gid) || 588 (gr = getgrgid(st->st_gid)) != NULL)) 589 { 590 register char **gp; 591 592 for (gp = gr->gr_mem; *gp != NULL; gp++) 593 if (strcmp(*gp, uname) == 0) 594 break; 595 if (*gp == NULL) 596 mode >>= 3; 597 } 598 #endif 599 else 600 mode >>= 3; 601 } 602 if (tTd(54, 4)) 603 printf("\t[uid %d, stat %o, mode %o] ", 604 st->st_uid, st->st_mode, mode); 605 if ((st->st_uid == uid || st->st_uid == 0 || 606 !bitset(SFF_MUSTOWN, flags)) && 607 (st->st_mode & mode) == mode) 608 { 609 if (tTd(54, 4)) 610 printf("\tOK\n"); 611 return 0; 612 } 613 if (tTd(54, 4)) 614 printf("\tEACCES\n"); 615 return EACCES; 616 } 617 /* 618 ** SAFEFOPEN -- do a file open with extra checking 619 ** 620 ** Parameters: 621 ** fn -- the file name to open. 622 ** omode -- the open-style mode flags. 623 ** cmode -- the create-style mode flags. 624 ** sff -- safefile flags. 625 ** 626 ** Returns: 627 ** Same as fopen. 628 */ 629 630 #ifndef O_ACCMODE 631 # define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR) 632 #endif 633 634 FILE * 635 safefopen(fn, omode, cmode, sff) 636 char *fn; 637 int omode; 638 int cmode; 639 int sff; 640 { 641 int rval; 642 FILE *fp; 643 int smode; 644 struct stat stb, sta; 645 646 if (bitset(O_CREAT, omode)) 647 sff |= SFF_CREAT; 648 smode = 0; 649 switch (omode & O_ACCMODE) 650 { 651 case O_RDONLY: 652 smode = S_IREAD; 653 break; 654 655 case O_WRONLY: 656 smode = S_IWRITE; 657 break; 658 659 case O_RDWR: 660 smode = S_IREAD|S_IWRITE; 661 break; 662 663 default: 664 smode = 0; 665 break; 666 } 667 if (bitset(SFF_OPENASROOT, sff)) 668 rval = safefile(fn, 0, 0, NULL, sff, smode, &stb); 669 else 670 rval = safefile(fn, RealUid, RealGid, RealUserName, 671 sff, smode, &stb); 672 if (rval != 0) 673 { 674 errno = rval; 675 return NULL; 676 } 677 if (stb.st_mode == ST_MODE_NOFILE) 678 omode |= O_EXCL; 679 680 fp = dfopen(fn, omode, cmode); 681 if (fp == NULL) 682 return NULL; 683 if (bitset(O_EXCL, omode)) 684 return fp; 685 if (fstat(fileno(fp), &sta) < 0 || 686 sta.st_nlink != stb.st_nlink || 687 sta.st_dev != stb.st_dev || 688 sta.st_ino != stb.st_ino || 689 sta.st_uid != stb.st_uid || 690 sta.st_gid != stb.st_gid) 691 { 692 syserr("554 cannot open: file %s changed after open", fn); 693 fclose(fp); 694 errno = EPERM; 695 return NULL; 696 } 697 return fp; 698 } 699 /* 700 ** FIXCRLF -- fix <CR><LF> in line. 701 ** 702 ** Looks for the <CR><LF> combination and turns it into the 703 ** UNIX canonical <NL> character. It only takes one line, 704 ** i.e., it is assumed that the first <NL> found is the end 705 ** of the line. 706 ** 707 ** Parameters: 708 ** line -- the line to fix. 709 ** stripnl -- if true, strip the newline also. 710 ** 711 ** Returns: 712 ** none. 713 ** 714 ** Side Effects: 715 ** line is changed in place. 716 */ 717 718 void 719 fixcrlf(line, stripnl) 720 char *line; 721 bool stripnl; 722 { 723 register char *p; 724 725 p = strchr(line, '\n'); 726 if (p == NULL) 727 return; 728 if (p > line && p[-1] == '\r') 729 p--; 730 if (!stripnl) 731 *p++ = '\n'; 732 *p = '\0'; 733 } 734 /* 735 ** DFOPEN -- determined file open 736 ** 737 ** This routine has the semantics of fopen, except that it will 738 ** keep trying a few times to make this happen. The idea is that 739 ** on very loaded systems, we may run out of resources (inodes, 740 ** whatever), so this tries to get around it. 741 */ 742 743 struct omodes 744 { 745 int mask; 746 int mode; 747 char *farg; 748 } OpenModes[] = 749 { 750 O_ACCMODE, O_RDONLY, "r", 751 O_ACCMODE|O_APPEND, O_WRONLY, "w", 752 O_ACCMODE|O_APPEND, O_WRONLY|O_APPEND, "a", 753 O_TRUNC, 0, "w+", 754 O_APPEND, O_APPEND, "a+", 755 0, 0, "r+", 756 }; 757 758 FILE * 759 dfopen(filename, omode, cmode) 760 char *filename; 761 int omode; 762 int cmode; 763 { 764 register int tries; 765 int fd; 766 register struct omodes *om; 767 struct stat st; 768 769 for (om = OpenModes; om->mask != 0; om++) 770 if ((omode & om->mask) == om->mode) 771 break; 772 773 for (tries = 0; tries < 10; tries++) 774 { 775 sleep((unsigned) (10 * tries)); 776 errno = 0; 777 fd = open(filename, omode, cmode); 778 if (fd >= 0) 779 break; 780 switch (errno) 781 { 782 case ENFILE: /* system file table full */ 783 case EINTR: /* interrupted syscall */ 784 #ifdef ETXTBSY 785 case ETXTBSY: /* Apollo: net file locked */ 786 #endif 787 continue; 788 } 789 break; 790 } 791 if (fd >= 0 && fstat(fd, &st) >= 0 && S_ISREG(st.st_mode)) 792 { 793 int locktype; 794 795 /* lock the file to avoid accidental conflicts */ 796 if ((omode & O_ACCMODE) != O_RDONLY) 797 locktype = LOCK_EX; 798 else 799 locktype = LOCK_SH; 800 (void) lockfile(fd, filename, NULL, locktype); 801 errno = 0; 802 } 803 if (fd < 0) 804 return NULL; 805 else 806 return fdopen(fd, om->farg); 807 } 808 /* 809 ** PUTLINE -- put a line like fputs obeying SMTP conventions 810 ** 811 ** This routine always guarantees outputing a newline (or CRLF, 812 ** as appropriate) at the end of the string. 813 ** 814 ** Parameters: 815 ** l -- line to put. 816 ** mci -- the mailer connection information. 817 ** 818 ** Returns: 819 ** none 820 ** 821 ** Side Effects: 822 ** output of l to fp. 823 */ 824 825 void 826 putline(l, mci) 827 register char *l; 828 register MCI *mci; 829 { 830 putxline(l, mci, PXLF_MAPFROM); 831 } 832 /* 833 ** PUTXLINE -- putline with flags bits. 834 ** 835 ** This routine always guarantees outputing a newline (or CRLF, 836 ** as appropriate) at the end of the string. 837 ** 838 ** Parameters: 839 ** l -- line to put. 840 ** mci -- the mailer connection information. 841 ** pxflags -- flag bits: 842 ** PXLF_MAPFROM -- map From_ to >From_. 843 ** PXLF_STRIP8BIT -- strip 8th bit. 844 ** 845 ** Returns: 846 ** none 847 ** 848 ** Side Effects: 849 ** output of l to fp. 850 */ 851 852 void 853 putxline(l, mci, pxflags) 854 register char *l; 855 register MCI *mci; 856 int pxflags; 857 { 858 register char *p; 859 register char svchar; 860 int slop = 0; 861 862 /* strip out 0200 bits -- these can look like TELNET protocol */ 863 if (bitset(MCIF_7BIT, mci->mci_flags) || 864 bitset(PXLF_STRIP8BIT, pxflags)) 865 { 866 for (p = l; (svchar = *p) != '\0'; ++p) 867 if (bitset(0200, svchar)) 868 *p = svchar &~ 0200; 869 } 870 871 do 872 { 873 /* find the end of the line */ 874 p = strchr(l, '\n'); 875 if (p == NULL) 876 p = &l[strlen(l)]; 877 878 if (TrafficLogFile != NULL) 879 fprintf(TrafficLogFile, "%05d >>> ", getpid()); 880 881 /* check for line overflow */ 882 while (mci->mci_mailer->m_linelimit > 0 && 883 (p - l + slop) > mci->mci_mailer->m_linelimit) 884 { 885 register char *q = &l[mci->mci_mailer->m_linelimit - slop - 1]; 886 887 svchar = *q; 888 *q = '\0'; 889 if (l[0] == '.' && slop == 0 && 890 bitnset(M_XDOT, mci->mci_mailer->m_flags)) 891 { 892 (void) putc('.', mci->mci_out); 893 if (TrafficLogFile != NULL) 894 (void) putc('.', TrafficLogFile); 895 } 896 else if (l[0] == 'F' && slop == 0 && 897 bitset(PXLF_MAPFROM, pxflags) && 898 strncmp(l, "From ", 5) == 0 && 899 bitnset(M_ESCFROM, mci->mci_mailer->m_flags)) 900 { 901 (void) putc('>', mci->mci_out); 902 if (TrafficLogFile != NULL) 903 (void) putc('>', TrafficLogFile); 904 } 905 fputs(l, mci->mci_out); 906 (void) putc('!', mci->mci_out); 907 fputs(mci->mci_mailer->m_eol, mci->mci_out); 908 (void) putc(' ', mci->mci_out); 909 if (TrafficLogFile != NULL) 910 fprintf(TrafficLogFile, "%s!\n%05d >>> ", 911 l, getpid()); 912 *q = svchar; 913 l = q; 914 slop = 1; 915 } 916 917 /* output last part */ 918 if (l[0] == '.' && slop == 0 && 919 bitnset(M_XDOT, mci->mci_mailer->m_flags)) 920 { 921 (void) putc('.', mci->mci_out); 922 if (TrafficLogFile != NULL) 923 (void) putc('.', TrafficLogFile); 924 } 925 if (TrafficLogFile != NULL) 926 fprintf(TrafficLogFile, "%.*s\n", p - l, l); 927 for ( ; l < p; ++l) 928 (void) putc(*l, mci->mci_out); 929 fputs(mci->mci_mailer->m_eol, mci->mci_out); 930 if (*l == '\n') 931 ++l; 932 } while (l[0] != '\0'); 933 } 934 /* 935 ** XUNLINK -- unlink a file, doing logging as appropriate. 936 ** 937 ** Parameters: 938 ** f -- name of file to unlink. 939 ** 940 ** Returns: 941 ** none. 942 ** 943 ** Side Effects: 944 ** f is unlinked. 945 */ 946 947 void 948 xunlink(f) 949 char *f; 950 { 951 register int i; 952 953 # ifdef LOG 954 if (LogLevel > 98) 955 syslog(LOG_DEBUG, "%s: unlink %s", CurEnv->e_id, f); 956 # endif /* LOG */ 957 958 i = unlink(f); 959 # ifdef LOG 960 if (i < 0 && LogLevel > 97) 961 syslog(LOG_DEBUG, "%s: unlink-fail %d", f, errno); 962 # endif /* LOG */ 963 } 964 /* 965 ** XFCLOSE -- close a file, doing logging as appropriate. 966 ** 967 ** Parameters: 968 ** fp -- file pointer for the file to close 969 ** a, b -- miscellaneous crud to print for debugging 970 ** 971 ** Returns: 972 ** none. 973 ** 974 ** Side Effects: 975 ** fp is closed. 976 */ 977 978 void 979 xfclose(fp, a, b) 980 FILE *fp; 981 char *a, *b; 982 { 983 if (tTd(53, 99)) 984 printf("xfclose(%x) %s %s\n", fp, a, b); 985 #if XDEBUG 986 if (fileno(fp) == 1) 987 syserr("xfclose(%s %s): fd = 1", a, b); 988 #endif 989 if (fclose(fp) < 0 && tTd(53, 99)) 990 printf("xfclose FAILURE: %s\n", errstring(errno)); 991 } 992 /* 993 ** SFGETS -- "safe" fgets -- times out and ignores random interrupts. 994 ** 995 ** Parameters: 996 ** buf -- place to put the input line. 997 ** siz -- size of buf. 998 ** fp -- file to read from. 999 ** timeout -- the timeout before error occurs. 1000 ** during -- what we are trying to read (for error messages). 1001 ** 1002 ** Returns: 1003 ** NULL on error (including timeout). This will also leave 1004 ** buf containing a null string. 1005 ** buf otherwise. 1006 ** 1007 ** Side Effects: 1008 ** none. 1009 */ 1010 1011 static jmp_buf CtxReadTimeout; 1012 static void readtimeout(); 1013 1014 char * 1015 sfgets(buf, siz, fp, timeout, during) 1016 char *buf; 1017 int siz; 1018 FILE *fp; 1019 time_t timeout; 1020 char *during; 1021 { 1022 register EVENT *ev = NULL; 1023 register char *p; 1024 1025 if (fp == NULL) 1026 { 1027 buf[0] = '\0'; 1028 return NULL; 1029 } 1030 1031 /* set the timeout */ 1032 if (timeout != 0) 1033 { 1034 if (setjmp(CtxReadTimeout) != 0) 1035 { 1036 # ifdef LOG 1037 syslog(LOG_NOTICE, 1038 "timeout waiting for input from %s during %s\n", 1039 CurHostName? CurHostName: "local", during); 1040 # endif 1041 errno = 0; 1042 usrerr("451 timeout waiting for input during %s", 1043 during); 1044 buf[0] = '\0'; 1045 #if XDEBUG 1046 checkfd012(during); 1047 #endif 1048 return (NULL); 1049 } 1050 ev = setevent(timeout, readtimeout, 0); 1051 } 1052 1053 /* try to read */ 1054 p = NULL; 1055 while (!feof(fp) && !ferror(fp)) 1056 { 1057 errno = 0; 1058 p = fgets(buf, siz, fp); 1059 if (p != NULL || errno != EINTR) 1060 break; 1061 clearerr(fp); 1062 } 1063 1064 /* clear the event if it has not sprung */ 1065 clrevent(ev); 1066 1067 /* clean up the books and exit */ 1068 LineNumber++; 1069 if (p == NULL) 1070 { 1071 buf[0] = '\0'; 1072 if (TrafficLogFile != NULL) 1073 fprintf(TrafficLogFile, "%05d <<< [EOF]\n", getpid()); 1074 return (NULL); 1075 } 1076 if (TrafficLogFile != NULL) 1077 fprintf(TrafficLogFile, "%05d <<< %s", getpid(), buf); 1078 if (SevenBitInput) 1079 { 1080 for (p = buf; *p != '\0'; p++) 1081 *p &= ~0200; 1082 } 1083 else if (!HasEightBits) 1084 { 1085 for (p = buf; *p != '\0'; p++) 1086 { 1087 if (bitset(0200, *p)) 1088 { 1089 HasEightBits = TRUE; 1090 break; 1091 } 1092 } 1093 } 1094 return (buf); 1095 } 1096 1097 static void 1098 readtimeout(timeout) 1099 time_t timeout; 1100 { 1101 longjmp(CtxReadTimeout, 1); 1102 } 1103 /* 1104 ** FGETFOLDED -- like fgets, but know about folded lines. 1105 ** 1106 ** Parameters: 1107 ** buf -- place to put result. 1108 ** n -- bytes available. 1109 ** f -- file to read from. 1110 ** 1111 ** Returns: 1112 ** input line(s) on success, NULL on error or EOF. 1113 ** This will normally be buf -- unless the line is too 1114 ** long, when it will be xalloc()ed. 1115 ** 1116 ** Side Effects: 1117 ** buf gets lines from f, with continuation lines (lines 1118 ** with leading white space) appended. CRLF's are mapped 1119 ** into single newlines. Any trailing NL is stripped. 1120 */ 1121 1122 char * 1123 fgetfolded(buf, n, f) 1124 char *buf; 1125 register int n; 1126 FILE *f; 1127 { 1128 register char *p = buf; 1129 char *bp = buf; 1130 register int i; 1131 1132 n--; 1133 while ((i = getc(f)) != EOF) 1134 { 1135 if (i == '\r') 1136 { 1137 i = getc(f); 1138 if (i != '\n') 1139 { 1140 if (i != EOF) 1141 (void) ungetc(i, f); 1142 i = '\r'; 1143 } 1144 } 1145 if (--n <= 0) 1146 { 1147 /* allocate new space */ 1148 char *nbp; 1149 int nn; 1150 1151 nn = (p - bp); 1152 if (nn < MEMCHUNKSIZE) 1153 nn *= 2; 1154 else 1155 nn += MEMCHUNKSIZE; 1156 nbp = xalloc(nn); 1157 bcopy(bp, nbp, p - bp); 1158 p = &nbp[p - bp]; 1159 if (bp != buf) 1160 free(bp); 1161 bp = nbp; 1162 n = nn - (p - bp); 1163 } 1164 *p++ = i; 1165 if (i == '\n') 1166 { 1167 LineNumber++; 1168 i = getc(f); 1169 if (i != EOF) 1170 (void) ungetc(i, f); 1171 if (i != ' ' && i != '\t') 1172 break; 1173 } 1174 } 1175 if (p == bp) 1176 return (NULL); 1177 if (p[-1] == '\n') 1178 p--; 1179 *p = '\0'; 1180 return (bp); 1181 } 1182 /* 1183 ** CURTIME -- return current time. 1184 ** 1185 ** Parameters: 1186 ** none. 1187 ** 1188 ** Returns: 1189 ** the current time. 1190 ** 1191 ** Side Effects: 1192 ** none. 1193 */ 1194 1195 time_t 1196 curtime() 1197 { 1198 auto time_t t; 1199 1200 (void) time(&t); 1201 return (t); 1202 } 1203 /* 1204 ** ATOBOOL -- convert a string representation to boolean. 1205 ** 1206 ** Defaults to "TRUE" 1207 ** 1208 ** Parameters: 1209 ** s -- string to convert. Takes "tTyY" as true, 1210 ** others as false. 1211 ** 1212 ** Returns: 1213 ** A boolean representation of the string. 1214 ** 1215 ** Side Effects: 1216 ** none. 1217 */ 1218 1219 bool 1220 atobool(s) 1221 register char *s; 1222 { 1223 if (s == NULL || *s == '\0' || strchr("tTyY", *s) != NULL) 1224 return (TRUE); 1225 return (FALSE); 1226 } 1227 /* 1228 ** ATOOCT -- convert a string representation to octal. 1229 ** 1230 ** Parameters: 1231 ** s -- string to convert. 1232 ** 1233 ** Returns: 1234 ** An integer representing the string interpreted as an 1235 ** octal number. 1236 ** 1237 ** Side Effects: 1238 ** none. 1239 */ 1240 1241 int 1242 atooct(s) 1243 register char *s; 1244 { 1245 register int i = 0; 1246 1247 while (*s >= '0' && *s <= '7') 1248 i = (i << 3) | (*s++ - '0'); 1249 return (i); 1250 } 1251 /* 1252 ** WAITFOR -- wait for a particular process id. 1253 ** 1254 ** Parameters: 1255 ** pid -- process id to wait for. 1256 ** 1257 ** Returns: 1258 ** status of pid. 1259 ** -1 if pid never shows up. 1260 ** 1261 ** Side Effects: 1262 ** none. 1263 */ 1264 1265 int 1266 waitfor(pid) 1267 int pid; 1268 { 1269 #ifdef WAITUNION 1270 union wait st; 1271 #else 1272 auto int st; 1273 #endif 1274 int i; 1275 1276 do 1277 { 1278 errno = 0; 1279 i = wait(&st); 1280 } while ((i >= 0 || errno == EINTR) && i != pid); 1281 if (i < 0) 1282 return -1; 1283 #ifdef WAITUNION 1284 return st.w_status; 1285 #else 1286 return st; 1287 #endif 1288 } 1289 /* 1290 ** BITINTERSECT -- tell if two bitmaps intersect 1291 ** 1292 ** Parameters: 1293 ** a, b -- the bitmaps in question 1294 ** 1295 ** Returns: 1296 ** TRUE if they have a non-null intersection 1297 ** FALSE otherwise 1298 ** 1299 ** Side Effects: 1300 ** none. 1301 */ 1302 1303 bool 1304 bitintersect(a, b) 1305 BITMAP a; 1306 BITMAP b; 1307 { 1308 int i; 1309 1310 for (i = BITMAPBYTES / sizeof (int); --i >= 0; ) 1311 if ((a[i] & b[i]) != 0) 1312 return (TRUE); 1313 return (FALSE); 1314 } 1315 /* 1316 ** BITZEROP -- tell if a bitmap is all zero 1317 ** 1318 ** Parameters: 1319 ** map -- the bit map to check 1320 ** 1321 ** Returns: 1322 ** TRUE if map is all zero. 1323 ** FALSE if there are any bits set in map. 1324 ** 1325 ** Side Effects: 1326 ** none. 1327 */ 1328 1329 bool 1330 bitzerop(map) 1331 BITMAP map; 1332 { 1333 int i; 1334 1335 for (i = BITMAPBYTES / sizeof (int); --i >= 0; ) 1336 if (map[i] != 0) 1337 return (FALSE); 1338 return (TRUE); 1339 } 1340 /* 1341 ** STRCONTAINEDIN -- tell if one string is contained in another 1342 ** 1343 ** Parameters: 1344 ** a -- possible substring. 1345 ** b -- possible superstring. 1346 ** 1347 ** Returns: 1348 ** TRUE if a is contained in b. 1349 ** FALSE otherwise. 1350 */ 1351 1352 bool 1353 strcontainedin(a, b) 1354 register char *a; 1355 register char *b; 1356 { 1357 int la; 1358 int lb; 1359 int c; 1360 1361 la = strlen(a); 1362 lb = strlen(b); 1363 c = *a; 1364 if (isascii(c) && isupper(c)) 1365 c = tolower(c); 1366 for (; lb-- >= la; b++) 1367 { 1368 if (*b != c && isascii(*b) && isupper(*b) && tolower(*b) != c) 1369 continue; 1370 if (strncasecmp(a, b, la) == 0) 1371 return TRUE; 1372 } 1373 return FALSE; 1374 } 1375 /* 1376 ** CHECKFD012 -- check low numbered file descriptors 1377 ** 1378 ** File descriptors 0, 1, and 2 should be open at all times. 1379 ** This routine verifies that, and fixes it if not true. 1380 ** 1381 ** Parameters: 1382 ** where -- a tag printed if the assertion failed 1383 ** 1384 ** Returns: 1385 ** none 1386 */ 1387 1388 void 1389 checkfd012(where) 1390 char *where; 1391 { 1392 #if XDEBUG 1393 register int i; 1394 struct stat stbuf; 1395 1396 for (i = 0; i < 3; i++) 1397 { 1398 if (fstat(i, &stbuf) < 0 && errno != EOPNOTSUPP) 1399 { 1400 /* oops.... */ 1401 int fd; 1402 1403 syserr("%s: fd %d not open", where, i); 1404 fd = open("/dev/null", i == 0 ? O_RDONLY : O_WRONLY, 0666); 1405 if (fd != i) 1406 { 1407 (void) dup2(fd, i); 1408 (void) close(fd); 1409 } 1410 } 1411 } 1412 #endif /* XDEBUG */ 1413 } 1414 /* 1415 ** PRINTOPENFDS -- print the open file descriptors (for debugging) 1416 ** 1417 ** Parameters: 1418 ** logit -- if set, send output to syslog; otherwise 1419 ** print for debugging. 1420 ** 1421 ** Returns: 1422 ** none. 1423 */ 1424 1425 #include <arpa/inet.h> 1426 1427 void 1428 printopenfds(logit) 1429 bool logit; 1430 { 1431 register int fd; 1432 extern int DtableSize; 1433 1434 for (fd = 0; fd < DtableSize; fd++) 1435 dumpfd(fd, FALSE, logit); 1436 } 1437 /* 1438 ** DUMPFD -- dump a file descriptor 1439 ** 1440 ** Parameters: 1441 ** fd -- the file descriptor to dump. 1442 ** printclosed -- if set, print a notification even if 1443 ** it is closed; otherwise print nothing. 1444 ** logit -- if set, send output to syslog instead of stdout. 1445 */ 1446 1447 void 1448 dumpfd(fd, printclosed, logit) 1449 int fd; 1450 bool printclosed; 1451 bool logit; 1452 { 1453 register char *p; 1454 char *hp; 1455 char *fmtstr; 1456 SOCKADDR sa; 1457 auto int slen; 1458 struct stat st; 1459 char buf[200]; 1460 extern char *hostnamebyanyaddr(); 1461 1462 p = buf; 1463 sprintf(p, "%3d: ", fd); 1464 p += strlen(p); 1465 1466 if (fstat(fd, &st) < 0) 1467 { 1468 if (printclosed || errno != EBADF) 1469 { 1470 sprintf(p, "CANNOT STAT (%s)", errstring(errno)); 1471 goto printit; 1472 } 1473 return; 1474 } 1475 1476 slen = fcntl(fd, F_GETFL, NULL); 1477 if (slen != -1) 1478 { 1479 sprintf(p, "fl=0x%x, ", slen); 1480 p += strlen(p); 1481 } 1482 1483 sprintf(p, "mode=%o: ", st.st_mode); 1484 p += strlen(p); 1485 switch (st.st_mode & S_IFMT) 1486 { 1487 #ifdef S_IFSOCK 1488 case S_IFSOCK: 1489 sprintf(p, "SOCK "); 1490 p += strlen(p); 1491 slen = sizeof sa; 1492 if (getsockname(fd, &sa.sa, &slen) < 0) 1493 sprintf(p, "(%s)", errstring(errno)); 1494 else 1495 { 1496 hp = hostnamebyanyaddr(&sa); 1497 if (sa.sa.sa_family == AF_INET) 1498 sprintf(p, "%s/%d", hp, ntohs(sa.sin.sin_port)); 1499 else 1500 sprintf(p, "%s", hp); 1501 } 1502 p += strlen(p); 1503 sprintf(p, "->"); 1504 p += strlen(p); 1505 slen = sizeof sa; 1506 if (getpeername(fd, &sa.sa, &slen) < 0) 1507 sprintf(p, "(%s)", errstring(errno)); 1508 else 1509 { 1510 hp = hostnamebyanyaddr(&sa); 1511 if (sa.sa.sa_family == AF_INET) 1512 sprintf(p, "%s/%d", hp, ntohs(sa.sin.sin_port)); 1513 else 1514 sprintf(p, "%s", hp); 1515 } 1516 break; 1517 #endif 1518 1519 case S_IFCHR: 1520 sprintf(p, "CHR: "); 1521 p += strlen(p); 1522 goto defprint; 1523 1524 case S_IFBLK: 1525 sprintf(p, "BLK: "); 1526 p += strlen(p); 1527 goto defprint; 1528 1529 #if defined(S_IFIFO) && (!defined(S_IFSOCK) || S_IFIFO != S_IFSOCK) 1530 case S_IFIFO: 1531 sprintf(p, "FIFO: "); 1532 p += strlen(p); 1533 goto defprint; 1534 #endif 1535 1536 #ifdef S_IFDIR 1537 case S_IFDIR: 1538 sprintf(p, "DIR: "); 1539 p += strlen(p); 1540 goto defprint; 1541 #endif 1542 1543 #ifdef S_IFLNK 1544 case S_IFLNK: 1545 sprintf(p, "LNK: "); 1546 p += strlen(p); 1547 goto defprint; 1548 #endif 1549 1550 default: 1551 defprint: 1552 if (sizeof st.st_size > sizeof (long)) 1553 fmtstr = "dev=%d/%d, ino=%d, nlink=%d, u/gid=%d/%d, size=%qd"; 1554 else 1555 fmtstr = "dev=%d/%d, ino=%d, nlink=%d, u/gid=%d/%d, size=%ld"; 1556 sprintf(p, fmtstr, 1557 major(st.st_dev), minor(st.st_dev), st.st_ino, 1558 st.st_nlink, st.st_uid, st.st_gid, st.st_size); 1559 break; 1560 } 1561 1562 printit: 1563 #ifdef LOG 1564 if (logit) 1565 syslog(LOG_DEBUG, "%s", buf); 1566 else 1567 #endif 1568 printf("%s\n", buf); 1569 } 1570 /* 1571 ** SHORTENSTRING -- return short version of a string 1572 ** 1573 ** If the string is already short, just return it. If it is too 1574 ** long, return the head and tail of the string. 1575 ** 1576 ** Parameters: 1577 ** s -- the string to shorten. 1578 ** m -- the max length of the string. 1579 ** 1580 ** Returns: 1581 ** Either s or a short version of s. 1582 */ 1583 1584 #ifndef MAXSHORTSTR 1585 # define MAXSHORTSTR 203 1586 #endif 1587 1588 char * 1589 shortenstring(s, m) 1590 register const char *s; 1591 int m; 1592 { 1593 int l; 1594 static char buf[MAXSHORTSTR + 1]; 1595 1596 l = strlen(s); 1597 if (l < m) 1598 return (char *) s; 1599 if (m > MAXSHORTSTR) 1600 m = MAXSHORTSTR; 1601 else if (m < 10) 1602 { 1603 if (m < 5) 1604 { 1605 strncpy(buf, s, m); 1606 buf[m] = '\0'; 1607 return buf; 1608 } 1609 strncpy(buf, s, m - 3); 1610 strcpy(buf + m - 3, "..."); 1611 return buf; 1612 } 1613 m = (m - 3) / 2; 1614 strncpy(buf, s, m); 1615 strcpy(buf + m, "..."); 1616 strcpy(buf + m + 3, s + l - m); 1617 return buf; 1618 } 1619 /* 1620 ** SHORTEN_HOSTNAME -- strip local domain information off of hostname. 1621 ** 1622 ** Parameters: 1623 ** host -- the host to shorten (stripped in place). 1624 ** 1625 ** Returns: 1626 ** none. 1627 */ 1628 1629 void 1630 shorten_hostname(host) 1631 char host[]; 1632 { 1633 register char *p; 1634 char *mydom; 1635 int i; 1636 bool canon = FALSE; 1637 1638 /* strip off final dot */ 1639 p = &host[strlen(host) - 1]; 1640 if (*p == '.') 1641 { 1642 *p = '\0'; 1643 canon = TRUE; 1644 } 1645 1646 /* see if there is any domain at all -- if not, we are done */ 1647 p = strchr(host, '.'); 1648 if (p == NULL) 1649 return; 1650 1651 /* yes, we have a domain -- see if it looks like us */ 1652 mydom = macvalue('m', CurEnv); 1653 if (mydom == NULL) 1654 mydom = ""; 1655 i = strlen(++p); 1656 if ((canon ? strcasecmp(p, mydom) : strncasecmp(p, mydom, i)) == 0 && 1657 (mydom[i] == '.' || mydom[i] == '\0')) 1658 *--p = '\0'; 1659 } 1660 /* 1661 ** PROG_OPEN -- open a program for reading 1662 ** 1663 ** Parameters: 1664 ** argv -- the argument list. 1665 ** pfd -- pointer to a place to store the file descriptor. 1666 ** e -- the current envelope. 1667 ** 1668 ** Returns: 1669 ** pid of the process -- -1 if it failed. 1670 */ 1671 1672 int 1673 prog_open(argv, pfd, e) 1674 char **argv; 1675 int *pfd; 1676 ENVELOPE *e; 1677 { 1678 int pid; 1679 int i; 1680 int saveerrno; 1681 int fdv[2]; 1682 char *p, *q; 1683 char buf[MAXLINE + 1]; 1684 extern int DtableSize; 1685 1686 if (pipe(fdv) < 0) 1687 { 1688 syserr("%s: cannot create pipe for stdout", argv[0]); 1689 return -1; 1690 } 1691 pid = fork(); 1692 if (pid < 0) 1693 { 1694 syserr("%s: cannot fork", argv[0]); 1695 close(fdv[0]); 1696 close(fdv[1]); 1697 return -1; 1698 } 1699 if (pid > 0) 1700 { 1701 /* parent */ 1702 close(fdv[1]); 1703 *pfd = fdv[0]; 1704 return pid; 1705 } 1706 1707 /* child -- close stdin */ 1708 close(0); 1709 1710 /* stdout goes back to parent */ 1711 close(fdv[0]); 1712 if (dup2(fdv[1], 1) < 0) 1713 { 1714 syserr("%s: cannot dup2 for stdout", argv[0]); 1715 _exit(EX_OSERR); 1716 } 1717 close(fdv[1]); 1718 1719 /* stderr goes to transcript if available */ 1720 if (e->e_xfp != NULL) 1721 { 1722 if (dup2(fileno(e->e_xfp), 2) < 0) 1723 { 1724 syserr("%s: cannot dup2 for stderr", argv[0]); 1725 _exit(EX_OSERR); 1726 } 1727 } 1728 1729 /* this process has no right to the queue file */ 1730 if (e->e_lockfp != NULL) 1731 close(fileno(e->e_lockfp)); 1732 1733 /* run as default user */ 1734 setgid(DefGid); 1735 setuid(DefUid); 1736 1737 /* run in some directory */ 1738 if (ProgMailer != NULL) 1739 p = ProgMailer->m_execdir; 1740 else 1741 p = NULL; 1742 for (; p != NULL; p = q) 1743 { 1744 q = strchr(p, ':'); 1745 if (q != NULL) 1746 *q = '\0'; 1747 expand(p, buf, sizeof buf, e); 1748 if (q != NULL) 1749 *q++ = ':'; 1750 if (buf[0] != '\0' && chdir(buf) >= 0) 1751 break; 1752 } 1753 if (p == NULL) 1754 { 1755 /* backup directories */ 1756 if (chdir("/tmp") < 0) 1757 (void) chdir("/"); 1758 } 1759 1760 /* arrange for all the files to be closed */ 1761 for (i = 3; i < DtableSize; i++) 1762 { 1763 register int j; 1764 1765 if ((j = fcntl(i, F_GETFD, 0)) != -1) 1766 (void) fcntl(i, F_SETFD, j | 1); 1767 } 1768 1769 /* now exec the process */ 1770 execve(argv[0], (ARGV_T) argv, (ARGV_T) UserEnviron); 1771 1772 /* woops! failed */ 1773 saveerrno = errno; 1774 syserr("%s: cannot exec", argv[0]); 1775 if (transienterror(saveerrno)) 1776 _exit(EX_OSERR); 1777 _exit(EX_CONFIG); 1778 } 1779 /* 1780 ** GET_COLUMN -- look up a Column in a line buffer 1781 ** 1782 ** Parameters: 1783 ** line -- the raw text line to search. 1784 ** col -- the column number to fetch. 1785 ** delim -- the delimiter between columns. If null, 1786 ** use white space. 1787 ** buf -- the output buffer. 1788 ** 1789 ** Returns: 1790 ** buf if successful. 1791 ** NULL otherwise. 1792 */ 1793 1794 char * 1795 get_column(line, col, delim, buf) 1796 char line[]; 1797 int col; 1798 char delim; 1799 char buf[]; 1800 { 1801 char *p; 1802 char *begin, *end; 1803 int i; 1804 char delimbuf[3]; 1805 1806 if (delim == '\0') 1807 strcpy(delimbuf, "\n\t "); 1808 else 1809 { 1810 delimbuf[0] = delim; 1811 delimbuf[1] = '\0'; 1812 } 1813 1814 p = line; 1815 if (*p == '\0') 1816 return NULL; /* line empty */ 1817 if (*p == delim && col == 0) 1818 return NULL; /* first column empty */ 1819 1820 begin = line; 1821 1822 if (col == 0 && delim == '\0') 1823 { 1824 while (*begin && isspace(*begin)) 1825 begin++; 1826 } 1827 1828 for (i = 0; i < col; i++) 1829 { 1830 if ((begin = strpbrk(begin, delimbuf)) == NULL) 1831 return NULL; /* no such column */ 1832 begin++; 1833 if (delim == '\0') 1834 { 1835 while (*begin && isspace(*begin)) 1836 begin++; 1837 } 1838 } 1839 1840 end = strpbrk(begin, delimbuf); 1841 if (end == NULL) 1842 { 1843 strcpy(buf, begin); 1844 } 1845 else 1846 { 1847 strncpy(buf, begin, end - begin); 1848 buf[end - begin] = '\0'; 1849 } 1850 return buf; 1851 } 1852 /* 1853 ** CLEANSTRCPY -- copy string keeping out bogus characters 1854 ** 1855 ** Parameters: 1856 ** t -- "to" string. 1857 ** f -- "from" string. 1858 ** l -- length of space available in "to" string. 1859 ** 1860 ** Returns: 1861 ** none. 1862 */ 1863 1864 void 1865 cleanstrcpy(t, f, l) 1866 register char *t; 1867 register char *f; 1868 int l; 1869 { 1870 #ifdef LOG 1871 /* check for newlines and log if necessary */ 1872 (void) denlstring(f, TRUE, TRUE); 1873 #endif 1874 1875 l--; 1876 while (l > 0 && *f != '\0') 1877 { 1878 if (isascii(*f) && 1879 (isalnum(*f) || strchr("!#$%&'*+-./^_`{|}~", *f) != NULL)) 1880 { 1881 l--; 1882 *t++ = *f; 1883 } 1884 f++; 1885 } 1886 *t = '\0'; 1887 } 1888 /* 1889 ** DENLSTRING -- convert newlines in a string to spaces 1890 ** 1891 ** Parameters: 1892 ** s -- the input string 1893 ** strict -- if set, don't permit continuation lines. 1894 ** logattacks -- if set, log attempted attacks. 1895 ** 1896 ** Returns: 1897 ** A pointer to a version of the string with newlines 1898 ** mapped to spaces. This should be copied. 1899 */ 1900 1901 char * 1902 denlstring(s, strict, logattacks) 1903 char *s; 1904 bool strict; 1905 bool logattacks; 1906 { 1907 register char *p; 1908 int l; 1909 static char *bp = NULL; 1910 static int bl = 0; 1911 1912 p = s; 1913 while ((p = strchr(p, '\n')) != NULL) 1914 if (strict || (*++p != ' ' && *p != '\t')) 1915 break; 1916 if (p == NULL) 1917 return s; 1918 1919 l = strlen(s) + 1; 1920 if (bl < l) 1921 { 1922 /* allocate more space */ 1923 if (bp != NULL) 1924 free(bp); 1925 bp = xalloc(l); 1926 bl = l; 1927 } 1928 strcpy(bp, s); 1929 for (p = bp; (p = strchr(p, '\n')) != NULL; ) 1930 *p++ = ' '; 1931 1932 /* 1933 #ifdef LOG 1934 if (logattacks) 1935 { 1936 syslog(LOG_NOTICE, "POSSIBLE ATTACK from %s: newline in string \"%s\"", 1937 RealHostName == NULL ? "[UNKNOWN]" : RealHostName, 1938 shortenstring(bp, 80)); 1939 } 1940 #endif 1941 */ 1942 1943 return bp; 1944 } 1945