1 /* 2 * Copyright (c) 1983 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 8.57 (Berkeley) 03/10/95"; 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 stripquotes(s) 35 char *s; 36 { 37 register char *p; 38 register char *q; 39 register char c; 40 41 if (s == NULL) 42 return; 43 44 p = q = s; 45 do 46 { 47 c = *p++; 48 if (c == '\\') 49 c = *p++; 50 else if (c == '"') 51 continue; 52 *q++ = c; 53 } while (c != '\0'); 54 } 55 /* 56 ** XALLOC -- Allocate memory and bitch wildly on failure. 57 ** 58 ** THIS IS A CLUDGE. This should be made to give a proper 59 ** error -- but after all, what can we do? 60 ** 61 ** Parameters: 62 ** sz -- size of area to allocate. 63 ** 64 ** Returns: 65 ** pointer to data region. 66 ** 67 ** Side Effects: 68 ** Memory is allocated. 69 */ 70 71 char * 72 xalloc(sz) 73 register int sz; 74 { 75 register char *p; 76 77 /* some systems can't handle size zero mallocs */ 78 if (sz <= 0) 79 sz = 1; 80 81 p = malloc((unsigned) sz); 82 if (p == NULL) 83 { 84 syserr("Out of memory!!"); 85 abort(); 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 printav(av) 186 register char **av; 187 { 188 while (*av != NULL) 189 { 190 if (tTd(0, 44)) 191 printf("\n\t%08x=", *av); 192 else 193 (void) putchar(' '); 194 xputs(*av++); 195 } 196 (void) putchar('\n'); 197 } 198 /* 199 ** LOWER -- turn letter into lower case. 200 ** 201 ** Parameters: 202 ** c -- character to turn into lower case. 203 ** 204 ** Returns: 205 ** c, in lower case. 206 ** 207 ** Side Effects: 208 ** none. 209 */ 210 211 char 212 lower(c) 213 register char c; 214 { 215 return((isascii(c) && isupper(c)) ? tolower(c) : c); 216 } 217 /* 218 ** XPUTS -- put string doing control escapes. 219 ** 220 ** Parameters: 221 ** s -- string to put. 222 ** 223 ** Returns: 224 ** none. 225 ** 226 ** Side Effects: 227 ** output to stdout 228 */ 229 230 xputs(s) 231 register char *s; 232 { 233 register int c; 234 register struct metamac *mp; 235 extern struct metamac MetaMacros[]; 236 237 if (s == NULL) 238 { 239 printf("<null>"); 240 return; 241 } 242 while ((c = (*s++ & 0377)) != '\0') 243 { 244 if (!isascii(c)) 245 { 246 if (c == MATCHREPL) 247 { 248 putchar('$'); 249 continue; 250 } 251 if (c == MACROEXPAND) 252 { 253 putchar('$'); 254 if (bitset(0200, *s)) 255 printf("{%s}", macname(*s++ & 0377)); 256 continue; 257 } 258 for (mp = MetaMacros; mp->metaname != '\0'; mp++) 259 { 260 if ((mp->metaval & 0377) == c) 261 { 262 printf("$%c", mp->metaname); 263 break; 264 } 265 } 266 if (mp->metaname != '\0') 267 continue; 268 (void) putchar('\\'); 269 c &= 0177; 270 } 271 if (isprint(c)) 272 { 273 putchar(c); 274 continue; 275 } 276 277 /* wasn't a meta-macro -- find another way to print it */ 278 switch (c) 279 { 280 case '\n': 281 c = 'n'; 282 break; 283 284 case '\r': 285 c = 'r'; 286 break; 287 288 case '\t': 289 c = 't'; 290 break; 291 292 default: 293 (void) putchar('^'); 294 (void) putchar(c ^ 0100); 295 continue; 296 } 297 (void) putchar('\\'); 298 (void) putchar(c); 299 } 300 (void) fflush(stdout); 301 } 302 /* 303 ** MAKELOWER -- Translate a line into lower case 304 ** 305 ** Parameters: 306 ** p -- the string to translate. If NULL, return is 307 ** immediate. 308 ** 309 ** Returns: 310 ** none. 311 ** 312 ** Side Effects: 313 ** String pointed to by p is translated to lower case. 314 ** 315 ** Called By: 316 ** parse 317 */ 318 319 void 320 makelower(p) 321 register char *p; 322 { 323 register char c; 324 325 if (p == NULL) 326 return; 327 for (; (c = *p) != '\0'; p++) 328 if (isascii(c) && isupper(c)) 329 *p = tolower(c); 330 } 331 /* 332 ** BUILDFNAME -- build full name from gecos style entry. 333 ** 334 ** This routine interprets the strange entry that would appear 335 ** in the GECOS field of the password file. 336 ** 337 ** Parameters: 338 ** p -- name to build. 339 ** login -- the login name of this user (for &). 340 ** buf -- place to put the result. 341 ** 342 ** Returns: 343 ** none. 344 ** 345 ** Side Effects: 346 ** none. 347 */ 348 349 buildfname(gecos, login, buf) 350 register char *gecos; 351 char *login; 352 char *buf; 353 { 354 register char *p; 355 register char *bp = buf; 356 int l; 357 358 if (*gecos == '*') 359 gecos++; 360 361 /* find length of final string */ 362 l = 0; 363 for (p = gecos; *p != '\0' && *p != ',' && *p != ';' && *p != '%'; p++) 364 { 365 if (*p == '&') 366 l += strlen(login); 367 else 368 l++; 369 } 370 371 /* now fill in buf */ 372 for (p = gecos; *p != '\0' && *p != ',' && *p != ';' && *p != '%'; p++) 373 { 374 if (*p == '&') 375 { 376 (void) strcpy(bp, login); 377 *bp = toupper(*bp); 378 while (*bp != '\0') 379 bp++; 380 } 381 else 382 *bp++ = *p; 383 } 384 *bp = '\0'; 385 } 386 /* 387 ** SAFEFILE -- return true if a file exists and is safe for a user. 388 ** 389 ** Parameters: 390 ** fn -- filename to check. 391 ** uid -- user id to compare against. 392 ** gid -- group id to compare against. 393 ** uname -- user name to compare against (used for group 394 ** sets). 395 ** flags -- modifiers: 396 ** SFF_MUSTOWN -- "uid" must own this file. 397 ** SFF_NOSLINK -- file cannot be a symbolic link. 398 ** mode -- mode bits that must match. 399 ** st -- if set, points to a stat structure that will 400 ** get the stat info for the file. 401 ** 402 ** Returns: 403 ** 0 if fn exists, is owned by uid, and matches mode. 404 ** An errno otherwise. The actual errno is cleared. 405 ** 406 ** Side Effects: 407 ** none. 408 */ 409 410 #include <grp.h> 411 412 #ifndef S_IXOTH 413 # define S_IXOTH (S_IEXEC >> 6) 414 #endif 415 416 #ifndef S_IXGRP 417 # define S_IXGRP (S_IEXEC >> 3) 418 #endif 419 420 #ifndef S_IXUSR 421 # define S_IXUSR (S_IEXEC) 422 #endif 423 424 #define ST_MODE_NOFILE 0171147 /* unlikely to occur */ 425 426 int 427 safefile(fn, uid, gid, uname, flags, mode, st) 428 char *fn; 429 uid_t uid; 430 gid_t gid; 431 char *uname; 432 int flags; 433 int mode; 434 struct stat *st; 435 { 436 register char *p; 437 register struct group *gr = NULL; 438 struct stat stbuf; 439 440 if (tTd(54, 4)) 441 printf("safefile(%s, uid=%d, gid=%d, flags=%x, mode=%o):\n", 442 fn, uid, gid, flags, mode); 443 errno = 0; 444 if (st == NULL) 445 st = &stbuf; 446 447 if (!bitset(SFF_NOPATHCHECK, flags) || 448 (uid == 0 && !bitset(SFF_ROOTOK, flags))) 449 { 450 /* check the path to the file for acceptability */ 451 for (p = fn; (p = strchr(++p, '/')) != NULL; *p = '/') 452 { 453 *p = '\0'; 454 if (stat(fn, &stbuf) < 0) 455 break; 456 if (uid == 0 && bitset(S_IWGRP|S_IWOTH, stbuf.st_mode)) 457 message("051 WARNING: writable directory %s", 458 fn); 459 if (uid == 0 && !bitset(SFF_ROOTOK, flags)) 460 { 461 if (bitset(S_IXOTH, stbuf.st_mode)) 462 continue; 463 break; 464 } 465 if (stbuf.st_uid == uid && 466 bitset(S_IXUSR, stbuf.st_mode)) 467 continue; 468 if (stbuf.st_gid == gid && 469 bitset(S_IXGRP, stbuf.st_mode)) 470 continue; 471 #ifndef NO_GROUP_SET 472 if (uname != NULL && 473 ((gr != NULL && gr->gr_gid == stbuf.st_gid) || 474 (gr = getgrgid(stbuf.st_gid)) != NULL)) 475 { 476 register char **gp; 477 478 for (gp = gr->gr_mem; gp != NULL && *gp != NULL; gp++) 479 if (strcmp(*gp, uname) == 0) 480 break; 481 if (gp != NULL && *gp != NULL && 482 bitset(S_IXGRP, stbuf.st_mode)) 483 continue; 484 } 485 #endif 486 if (!bitset(S_IXOTH, stbuf.st_mode)) 487 break; 488 } 489 if (p != NULL) 490 { 491 int ret = errno; 492 493 if (ret == 0) 494 ret = EACCES; 495 if (tTd(54, 4)) 496 printf("\t[dir %s] %s\n", fn, errstring(ret)); 497 *p = '/'; 498 return ret; 499 } 500 } 501 502 #ifdef HASLSTAT 503 if ((bitset(SFF_NOSLINK, flags) ? lstat(fn, st) 504 : stat(fn, st)) < 0) 505 #else 506 if (stat(fn, st) < 0) 507 #endif 508 { 509 int ret = errno; 510 511 if (tTd(54, 4)) 512 printf("\t%s\n", errstring(ret)); 513 514 errno = 0; 515 if (!bitset(SFF_CREAT, flags)) 516 return ret; 517 518 /* check to see if legal to create the file */ 519 p = strrchr(fn, '/'); 520 if (p == NULL) 521 return ENOTDIR; 522 *p = '\0'; 523 if (stat(fn, &stbuf) >= 0) 524 { 525 int md = S_IWRITE|S_IEXEC; 526 if (stbuf.st_uid != uid) 527 md >>= 6; 528 if ((stbuf.st_mode & md) != md) 529 errno = EACCES; 530 } 531 ret = errno; 532 if (tTd(54, 4)) 533 printf("\t[final dir %s uid %d mode %o] %s\n", 534 fn, stbuf.st_uid, stbuf.st_mode, 535 errstring(ret)); 536 *p = '/'; 537 st->st_mode = ST_MODE_NOFILE; 538 return ret; 539 } 540 541 #ifdef S_ISLNK 542 if (bitset(SFF_NOSLINK, flags) && S_ISLNK(st->st_mode)) 543 { 544 if (tTd(54, 4)) 545 printf("\t[slink mode %o]\tEPERM\n", st->st_mode); 546 return EPERM; 547 } 548 #endif 549 if (bitset(SFF_REGONLY, flags) && !S_ISREG(st->st_mode)) 550 { 551 if (tTd(54, 4)) 552 printf("\t[non-reg mode %o]\tEPERM\n", st->st_mode); 553 return EPERM; 554 } 555 if (bitset(S_IWUSR|S_IWGRP|S_IWOTH, mode) && bitset(0111, st->st_mode)) 556 { 557 if (tTd(29, 5)) 558 printf("failed (mode %o: x bits)\n", st->st_mode); 559 return EPERM; 560 } 561 562 if (bitset(SFF_SETUIDOK, flags)) 563 { 564 if (bitset(S_ISUID, st->st_mode) && 565 (st->st_uid != 0 || bitset(SFF_ROOTOK, flags))) 566 { 567 uid = st->st_uid; 568 uname = NULL; 569 } 570 if (bitset(S_ISGID, st->st_mode) && 571 (st->st_gid != 0 || bitset(SFF_ROOTOK, flags))) 572 gid = st->st_gid; 573 } 574 575 if (uid == 0 && !bitset(SFF_ROOTOK, flags)) 576 mode >>= 6; 577 else if (st->st_uid != uid) 578 { 579 mode >>= 3; 580 if (st->st_gid == gid) 581 ; 582 #ifndef NO_GROUP_SET 583 else if (uname != NULL && 584 ((gr != NULL && gr->gr_gid == st->st_gid) || 585 (gr = getgrgid(st->st_gid)) != NULL)) 586 { 587 register char **gp; 588 589 for (gp = gr->gr_mem; *gp != NULL; gp++) 590 if (strcmp(*gp, uname) == 0) 591 break; 592 if (*gp == NULL) 593 mode >>= 3; 594 } 595 #endif 596 else 597 mode >>= 3; 598 } 599 if (tTd(54, 4)) 600 printf("\t[uid %d, stat %o, mode %o] ", 601 st->st_uid, st->st_mode, mode); 602 if ((st->st_uid == uid || st->st_uid == 0 || 603 !bitset(SFF_MUSTOWN, flags)) && 604 (st->st_mode & mode) == mode) 605 { 606 if (tTd(54, 4)) 607 printf("\tOK\n"); 608 return 0; 609 } 610 if (tTd(54, 4)) 611 printf("\tEACCES\n"); 612 return EACCES; 613 } 614 /* 615 ** SAFEFOPEN -- do a file open with extra checking 616 ** 617 ** Parameters: 618 ** fn -- the file name to open. 619 ** omode -- the open-style mode flags. 620 ** cmode -- the create-style mode flags. 621 ** sff -- safefile flags. 622 ** 623 ** Returns: 624 ** Same as fopen. 625 */ 626 627 FILE * 628 safefopen(fn, omode, cmode, sff) 629 char *fn; 630 int omode; 631 int cmode; 632 int sff; 633 { 634 int rval; 635 FILE *fp; 636 int smode; 637 struct stat stb, sta; 638 extern char RealUserName[]; 639 640 if (bitset(O_CREAT, omode)) 641 sff |= SFF_CREAT; 642 smode = 0; 643 switch (omode & O_ACCMODE) 644 { 645 case O_RDONLY: 646 smode = S_IREAD; 647 break; 648 649 case O_WRONLY: 650 smode = S_IWRITE; 651 break; 652 653 case O_RDWR: 654 smode = S_IREAD|S_IWRITE; 655 break; 656 657 default: 658 smode = 0; 659 break; 660 } 661 if (bitset(SFF_OPENASROOT, sff)) 662 rval = safefile(fn, 0, 0, NULL, sff, smode, &stb); 663 else 664 rval = safefile(fn, RealUid, RealGid, RealUserName, 665 sff, smode, &stb); 666 if (rval != 0) 667 { 668 errno = rval; 669 return NULL; 670 } 671 if (stb.st_mode == ST_MODE_NOFILE) 672 omode |= O_EXCL; 673 674 fp = dfopen(fn, omode, cmode); 675 if (fp == NULL) 676 return NULL; 677 if (bitset(O_EXCL, omode)) 678 return fp; 679 if (fstat(fileno(fp), &sta) < 0 || 680 sta.st_nlink != stb.st_nlink || 681 sta.st_dev != stb.st_dev || 682 sta.st_ino != stb.st_ino || 683 sta.st_uid != stb.st_uid || 684 sta.st_gid != stb.st_gid) 685 { 686 syserr("554 cannot open: file %s changed after open", fn); 687 fclose(fp); 688 errno = EPERM; 689 return NULL; 690 } 691 return fp; 692 } 693 /* 694 ** FIXCRLF -- fix <CR><LF> in line. 695 ** 696 ** Looks for the <CR><LF> combination and turns it into the 697 ** UNIX canonical <NL> character. It only takes one line, 698 ** i.e., it is assumed that the first <NL> found is the end 699 ** of the line. 700 ** 701 ** Parameters: 702 ** line -- the line to fix. 703 ** stripnl -- if true, strip the newline also. 704 ** 705 ** Returns: 706 ** none. 707 ** 708 ** Side Effects: 709 ** line is changed in place. 710 */ 711 712 fixcrlf(line, stripnl) 713 char *line; 714 bool stripnl; 715 { 716 register char *p; 717 718 p = strchr(line, '\n'); 719 if (p == NULL) 720 return; 721 if (p > line && p[-1] == '\r') 722 p--; 723 if (!stripnl) 724 *p++ = '\n'; 725 *p = '\0'; 726 } 727 /* 728 ** DFOPEN -- determined file open 729 ** 730 ** This routine has the semantics of fopen, except that it will 731 ** keep trying a few times to make this happen. The idea is that 732 ** on very loaded systems, we may run out of resources (inodes, 733 ** whatever), so this tries to get around it. 734 */ 735 736 #ifndef O_ACCMODE 737 # define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR) 738 #endif 739 740 struct omodes 741 { 742 int mask; 743 int mode; 744 char *farg; 745 } OpenModes[] = 746 { 747 O_ACCMODE, O_RDONLY, "r", 748 O_ACCMODE|O_APPEND, O_WRONLY, "w", 749 O_ACCMODE|O_APPEND, O_WRONLY|O_APPEND, "a", 750 O_TRUNC, 0, "w+", 751 O_APPEND, O_APPEND, "a+", 752 0, 0, "r+", 753 }; 754 755 FILE * 756 dfopen(filename, omode, cmode) 757 char *filename; 758 int omode; 759 int cmode; 760 { 761 register int tries; 762 int fd; 763 register struct omodes *om; 764 struct stat st; 765 766 for (om = OpenModes; om->mask != 0; om++) 767 if ((omode & om->mask) == om->mode) 768 break; 769 770 for (tries = 0; tries < 10; tries++) 771 { 772 sleep((unsigned) (10 * tries)); 773 errno = 0; 774 fd = open(filename, omode, cmode); 775 if (fd >= 0) 776 break; 777 switch (errno) 778 { 779 case ENFILE: /* system file table full */ 780 case EINTR: /* interrupted syscall */ 781 #ifdef ETXTBSY 782 case ETXTBSY: /* Apollo: net file locked */ 783 #endif 784 continue; 785 } 786 break; 787 } 788 if (fd >= 0 && fstat(fd, &st) >= 0 && S_ISREG(st.st_mode)) 789 { 790 int locktype; 791 792 /* lock the file to avoid accidental conflicts */ 793 if ((omode & O_ACCMODE) != O_RDONLY) 794 locktype = LOCK_EX; 795 else 796 locktype = LOCK_SH; 797 (void) lockfile(fd, filename, NULL, locktype); 798 errno = 0; 799 } 800 if (fd < 0) 801 return NULL; 802 else 803 return fdopen(fd, om->farg); 804 } 805 /* 806 ** PUTLINE -- put a line like fputs obeying SMTP conventions 807 ** 808 ** This routine always guarantees outputing a newline (or CRLF, 809 ** as appropriate) at the end of the string. 810 ** 811 ** Parameters: 812 ** l -- line to put. 813 ** mci -- the mailer connection information. 814 ** 815 ** Returns: 816 ** none 817 ** 818 ** Side Effects: 819 ** output of l to fp. 820 */ 821 822 putline(l, mci) 823 register char *l; 824 register MCI *mci; 825 { 826 register char *p; 827 register char svchar; 828 int slop = 0; 829 830 /* strip out 0200 bits -- these can look like TELNET protocol */ 831 if (bitset(MCIF_7BIT, mci->mci_flags)) 832 { 833 for (p = l; (svchar = *p) != '\0'; ++p) 834 if (bitset(0200, svchar)) 835 *p = svchar &~ 0200; 836 } 837 838 do 839 { 840 /* find the end of the line */ 841 p = strchr(l, '\n'); 842 if (p == NULL) 843 p = &l[strlen(l)]; 844 845 if (TrafficLogFile != NULL) 846 fprintf(TrafficLogFile, "%05d >>> ", getpid()); 847 848 /* check for line overflow */ 849 while (mci->mci_mailer->m_linelimit > 0 && 850 (p - l + slop) > mci->mci_mailer->m_linelimit) 851 { 852 register char *q = &l[mci->mci_mailer->m_linelimit - slop - 1]; 853 854 svchar = *q; 855 *q = '\0'; 856 if (l[0] == '.' && slop == 0 && 857 bitnset(M_XDOT, mci->mci_mailer->m_flags)) 858 { 859 (void) putc('.', mci->mci_out); 860 if (TrafficLogFile != NULL) 861 (void) putc('.', TrafficLogFile); 862 } 863 fputs(l, mci->mci_out); 864 (void) putc('!', mci->mci_out); 865 fputs(mci->mci_mailer->m_eol, mci->mci_out); 866 (void) putc(' ', mci->mci_out); 867 if (TrafficLogFile != NULL) 868 fprintf(TrafficLogFile, "%s!\n%05d >>> ", 869 l, getpid()); 870 *q = svchar; 871 l = q; 872 slop = 1; 873 } 874 875 /* output last part */ 876 if (l[0] == '.' && slop == 0 && 877 bitnset(M_XDOT, mci->mci_mailer->m_flags)) 878 { 879 (void) putc('.', mci->mci_out); 880 if (TrafficLogFile != NULL) 881 (void) putc('.', TrafficLogFile); 882 } 883 if (TrafficLogFile != NULL) 884 fprintf(TrafficLogFile, "%.*s\n", p - l, l); 885 for ( ; l < p; ++l) 886 (void) putc(*l, mci->mci_out); 887 fputs(mci->mci_mailer->m_eol, mci->mci_out); 888 if (*l == '\n') 889 ++l; 890 } while (l[0] != '\0'); 891 } 892 /* 893 ** XUNLINK -- unlink a file, doing logging as appropriate. 894 ** 895 ** Parameters: 896 ** f -- name of file to unlink. 897 ** 898 ** Returns: 899 ** none. 900 ** 901 ** Side Effects: 902 ** f is unlinked. 903 */ 904 905 xunlink(f) 906 char *f; 907 { 908 register int i; 909 910 # ifdef LOG 911 if (LogLevel > 98) 912 syslog(LOG_DEBUG, "%s: unlink %s", CurEnv->e_id, f); 913 # endif /* LOG */ 914 915 i = unlink(f); 916 # ifdef LOG 917 if (i < 0 && LogLevel > 97) 918 syslog(LOG_DEBUG, "%s: unlink-fail %d", f, errno); 919 # endif /* LOG */ 920 } 921 /* 922 ** XFCLOSE -- close a file, doing logging as appropriate. 923 ** 924 ** Parameters: 925 ** fp -- file pointer for the file to close 926 ** a, b -- miscellaneous crud to print for debugging 927 ** 928 ** Returns: 929 ** none. 930 ** 931 ** Side Effects: 932 ** fp is closed. 933 */ 934 935 xfclose(fp, a, b) 936 FILE *fp; 937 char *a, *b; 938 { 939 if (tTd(53, 99)) 940 printf("xfclose(%x) %s %s\n", fp, a, b); 941 #ifdef XDEBUG 942 if (fileno(fp) == 1) 943 syserr("xfclose(%s %s): fd = 1", a, b); 944 #endif 945 if (fclose(fp) < 0 && tTd(53, 99)) 946 printf("xfclose FAILURE: %s\n", errstring(errno)); 947 } 948 /* 949 ** SFGETS -- "safe" fgets -- times out and ignores random interrupts. 950 ** 951 ** Parameters: 952 ** buf -- place to put the input line. 953 ** siz -- size of buf. 954 ** fp -- file to read from. 955 ** timeout -- the timeout before error occurs. 956 ** during -- what we are trying to read (for error messages). 957 ** 958 ** Returns: 959 ** NULL on error (including timeout). This will also leave 960 ** buf containing a null string. 961 ** buf otherwise. 962 ** 963 ** Side Effects: 964 ** none. 965 */ 966 967 static jmp_buf CtxReadTimeout; 968 static void readtimeout(); 969 970 char * 971 sfgets(buf, siz, fp, timeout, during) 972 char *buf; 973 int siz; 974 FILE *fp; 975 time_t timeout; 976 char *during; 977 { 978 register EVENT *ev = NULL; 979 register char *p; 980 981 if (fp == NULL) 982 { 983 buf[0] = '\0'; 984 return NULL; 985 } 986 987 /* set the timeout */ 988 if (timeout != 0) 989 { 990 if (setjmp(CtxReadTimeout) != 0) 991 { 992 # ifdef LOG 993 syslog(LOG_NOTICE, 994 "timeout waiting for input from %s during %s\n", 995 CurHostName? CurHostName: "local", during); 996 # endif 997 errno = 0; 998 usrerr("451 timeout waiting for input during %s", 999 during); 1000 buf[0] = '\0'; 1001 #ifdef XDEBUG 1002 checkfd012(during); 1003 #endif 1004 return (NULL); 1005 } 1006 ev = setevent(timeout, readtimeout, 0); 1007 } 1008 1009 /* try to read */ 1010 p = NULL; 1011 while (!feof(fp) && !ferror(fp)) 1012 { 1013 errno = 0; 1014 p = fgets(buf, siz, fp); 1015 if (p != NULL || errno != EINTR) 1016 break; 1017 clearerr(fp); 1018 } 1019 1020 /* clear the event if it has not sprung */ 1021 clrevent(ev); 1022 1023 /* clean up the books and exit */ 1024 LineNumber++; 1025 if (p == NULL) 1026 { 1027 buf[0] = '\0'; 1028 if (TrafficLogFile != NULL) 1029 fprintf(TrafficLogFile, "%05d <<< [EOF]\n", getpid()); 1030 return (NULL); 1031 } 1032 if (TrafficLogFile != NULL) 1033 fprintf(TrafficLogFile, "%05d <<< %s", getpid(), buf); 1034 if (SevenBitInput) 1035 { 1036 for (p = buf; *p != '\0'; p++) 1037 *p &= ~0200; 1038 } 1039 else if (!HasEightBits) 1040 { 1041 for (p = buf; *p != '\0'; p++) 1042 { 1043 if (bitset(0200, *p)) 1044 { 1045 HasEightBits = TRUE; 1046 break; 1047 } 1048 } 1049 } 1050 return (buf); 1051 } 1052 1053 static void 1054 readtimeout(timeout) 1055 time_t timeout; 1056 { 1057 longjmp(CtxReadTimeout, 1); 1058 } 1059 /* 1060 ** FGETFOLDED -- like fgets, but know about folded lines. 1061 ** 1062 ** Parameters: 1063 ** buf -- place to put result. 1064 ** n -- bytes available. 1065 ** f -- file to read from. 1066 ** 1067 ** Returns: 1068 ** input line(s) on success, NULL on error or EOF. 1069 ** This will normally be buf -- unless the line is too 1070 ** long, when it will be xalloc()ed. 1071 ** 1072 ** Side Effects: 1073 ** buf gets lines from f, with continuation lines (lines 1074 ** with leading white space) appended. CRLF's are mapped 1075 ** into single newlines. Any trailing NL is stripped. 1076 */ 1077 1078 char * 1079 fgetfolded(buf, n, f) 1080 char *buf; 1081 register int n; 1082 FILE *f; 1083 { 1084 register char *p = buf; 1085 char *bp = buf; 1086 register int i; 1087 1088 n--; 1089 while ((i = getc(f)) != EOF) 1090 { 1091 if (i == '\r') 1092 { 1093 i = getc(f); 1094 if (i != '\n') 1095 { 1096 if (i != EOF) 1097 (void) ungetc(i, f); 1098 i = '\r'; 1099 } 1100 } 1101 if (--n <= 0) 1102 { 1103 /* allocate new space */ 1104 char *nbp; 1105 int nn; 1106 1107 nn = (p - bp); 1108 if (nn < MEMCHUNKSIZE) 1109 nn *= 2; 1110 else 1111 nn += MEMCHUNKSIZE; 1112 nbp = xalloc(nn); 1113 bcopy(bp, nbp, p - bp); 1114 p = &nbp[p - bp]; 1115 if (bp != buf) 1116 free(bp); 1117 bp = nbp; 1118 n = nn - (p - bp); 1119 } 1120 *p++ = i; 1121 if (i == '\n') 1122 { 1123 LineNumber++; 1124 i = getc(f); 1125 if (i != EOF) 1126 (void) ungetc(i, f); 1127 if (i != ' ' && i != '\t') 1128 break; 1129 } 1130 } 1131 if (p == bp) 1132 return (NULL); 1133 *--p = '\0'; 1134 return (bp); 1135 } 1136 /* 1137 ** CURTIME -- return current time. 1138 ** 1139 ** Parameters: 1140 ** none. 1141 ** 1142 ** Returns: 1143 ** the current time. 1144 ** 1145 ** Side Effects: 1146 ** none. 1147 */ 1148 1149 time_t 1150 curtime() 1151 { 1152 auto time_t t; 1153 1154 (void) time(&t); 1155 return (t); 1156 } 1157 /* 1158 ** ATOBOOL -- convert a string representation to boolean. 1159 ** 1160 ** Defaults to "TRUE" 1161 ** 1162 ** Parameters: 1163 ** s -- string to convert. Takes "tTyY" as true, 1164 ** others as false. 1165 ** 1166 ** Returns: 1167 ** A boolean representation of the string. 1168 ** 1169 ** Side Effects: 1170 ** none. 1171 */ 1172 1173 bool 1174 atobool(s) 1175 register char *s; 1176 { 1177 if (s == NULL || *s == '\0' || strchr("tTyY", *s) != NULL) 1178 return (TRUE); 1179 return (FALSE); 1180 } 1181 /* 1182 ** ATOOCT -- convert a string representation to octal. 1183 ** 1184 ** Parameters: 1185 ** s -- string to convert. 1186 ** 1187 ** Returns: 1188 ** An integer representing the string interpreted as an 1189 ** octal number. 1190 ** 1191 ** Side Effects: 1192 ** none. 1193 */ 1194 1195 atooct(s) 1196 register char *s; 1197 { 1198 register int i = 0; 1199 1200 while (*s >= '0' && *s <= '7') 1201 i = (i << 3) | (*s++ - '0'); 1202 return (i); 1203 } 1204 /* 1205 ** WAITFOR -- wait for a particular process id. 1206 ** 1207 ** Parameters: 1208 ** pid -- process id to wait for. 1209 ** 1210 ** Returns: 1211 ** status of pid. 1212 ** -1 if pid never shows up. 1213 ** 1214 ** Side Effects: 1215 ** none. 1216 */ 1217 1218 int 1219 waitfor(pid) 1220 int pid; 1221 { 1222 #ifdef WAITUNION 1223 union wait st; 1224 #else 1225 auto int st; 1226 #endif 1227 int i; 1228 1229 do 1230 { 1231 errno = 0; 1232 i = wait(&st); 1233 } while ((i >= 0 || errno == EINTR) && i != pid); 1234 if (i < 0) 1235 return -1; 1236 #ifdef WAITUNION 1237 return st.w_status; 1238 #else 1239 return st; 1240 #endif 1241 } 1242 /* 1243 ** BITINTERSECT -- tell if two bitmaps intersect 1244 ** 1245 ** Parameters: 1246 ** a, b -- the bitmaps in question 1247 ** 1248 ** Returns: 1249 ** TRUE if they have a non-null intersection 1250 ** FALSE otherwise 1251 ** 1252 ** Side Effects: 1253 ** none. 1254 */ 1255 1256 bool 1257 bitintersect(a, b) 1258 BITMAP a; 1259 BITMAP b; 1260 { 1261 int i; 1262 1263 for (i = BITMAPBYTES / sizeof (int); --i >= 0; ) 1264 if ((a[i] & b[i]) != 0) 1265 return (TRUE); 1266 return (FALSE); 1267 } 1268 /* 1269 ** BITZEROP -- tell if a bitmap is all zero 1270 ** 1271 ** Parameters: 1272 ** map -- the bit map to check 1273 ** 1274 ** Returns: 1275 ** TRUE if map is all zero. 1276 ** FALSE if there are any bits set in map. 1277 ** 1278 ** Side Effects: 1279 ** none. 1280 */ 1281 1282 bool 1283 bitzerop(map) 1284 BITMAP map; 1285 { 1286 int i; 1287 1288 for (i = BITMAPBYTES / sizeof (int); --i >= 0; ) 1289 if (map[i] != 0) 1290 return (FALSE); 1291 return (TRUE); 1292 } 1293 /* 1294 ** STRCONTAINEDIN -- tell if one string is contained in another 1295 ** 1296 ** Parameters: 1297 ** a -- possible substring. 1298 ** b -- possible superstring. 1299 ** 1300 ** Returns: 1301 ** TRUE if a is contained in b. 1302 ** FALSE otherwise. 1303 */ 1304 1305 bool 1306 strcontainedin(a, b) 1307 register char *a; 1308 register char *b; 1309 { 1310 int la; 1311 int lb; 1312 int c; 1313 1314 la = strlen(a); 1315 lb = strlen(b); 1316 c = *a; 1317 if (isascii(c) && isupper(c)) 1318 c = tolower(c); 1319 for (; lb-- >= la; b++) 1320 { 1321 if (*b != c && isascii(*b) && isupper(*b) && tolower(*b) != c) 1322 continue; 1323 if (strncasecmp(a, b, la) == 0) 1324 return TRUE; 1325 } 1326 return FALSE; 1327 } 1328 /* 1329 ** CHECKFD012 -- check low numbered file descriptors 1330 ** 1331 ** File descriptors 0, 1, and 2 should be open at all times. 1332 ** This routine verifies that, and fixes it if not true. 1333 ** 1334 ** Parameters: 1335 ** where -- a tag printed if the assertion failed 1336 ** 1337 ** Returns: 1338 ** none 1339 */ 1340 1341 checkfd012(where) 1342 char *where; 1343 { 1344 #ifdef XDEBUG 1345 register int i; 1346 struct stat stbuf; 1347 1348 for (i = 0; i < 3; i++) 1349 { 1350 if (fstat(i, &stbuf) < 0 && errno != EOPNOTSUPP) 1351 { 1352 /* oops.... */ 1353 int fd; 1354 1355 syserr("%s: fd %d not open", where, i); 1356 fd = open("/dev/null", i == 0 ? O_RDONLY : O_WRONLY, 0666); 1357 if (fd != i) 1358 { 1359 (void) dup2(fd, i); 1360 (void) close(fd); 1361 } 1362 } 1363 } 1364 #endif /* XDEBUG */ 1365 } 1366 /* 1367 ** PRINTOPENFDS -- print the open file descriptors (for debugging) 1368 ** 1369 ** Parameters: 1370 ** logit -- if set, send output to syslog; otherwise 1371 ** print for debugging. 1372 ** 1373 ** Returns: 1374 ** none. 1375 */ 1376 1377 #include <netdb.h> 1378 #include <arpa/inet.h> 1379 1380 printopenfds(logit) 1381 bool logit; 1382 { 1383 register int fd; 1384 extern int DtableSize; 1385 1386 for (fd = 0; fd < DtableSize; fd++) 1387 dumpfd(fd, FALSE, logit); 1388 } 1389 /* 1390 ** DUMPFD -- dump a file descriptor 1391 ** 1392 ** Parameters: 1393 ** fd -- the file descriptor to dump. 1394 ** printclosed -- if set, print a notification even if 1395 ** it is closed; otherwise print nothing. 1396 ** logit -- if set, send output to syslog instead of stdout. 1397 */ 1398 1399 dumpfd(fd, printclosed, logit) 1400 int fd; 1401 bool printclosed; 1402 bool logit; 1403 { 1404 register struct hostent *hp; 1405 register char *p; 1406 char *fmtstr; 1407 struct sockaddr_in sin; 1408 auto int slen; 1409 struct stat st; 1410 char buf[200]; 1411 1412 p = buf; 1413 sprintf(p, "%3d: ", fd); 1414 p += strlen(p); 1415 1416 if (fstat(fd, &st) < 0) 1417 { 1418 if (printclosed || errno != EBADF) 1419 { 1420 sprintf(p, "CANNOT STAT (%s)", errstring(errno)); 1421 goto printit; 1422 } 1423 return; 1424 } 1425 1426 slen = fcntl(fd, F_GETFL, NULL); 1427 if (slen != -1) 1428 { 1429 sprintf(p, "fl=0x%x, ", slen); 1430 p += strlen(p); 1431 } 1432 1433 sprintf(p, "mode=%o: ", st.st_mode); 1434 p += strlen(p); 1435 switch (st.st_mode & S_IFMT) 1436 { 1437 #ifdef S_IFSOCK 1438 case S_IFSOCK: 1439 sprintf(p, "SOCK "); 1440 p += strlen(p); 1441 slen = sizeof sin; 1442 if (getsockname(fd, (struct sockaddr *) &sin, &slen) < 0) 1443 sprintf(p, "(badsock)"); 1444 else 1445 { 1446 hp = gethostbyaddr((char *) &sin.sin_addr, 1447 INADDRSZ, AF_INET); 1448 sprintf(p, "%s/%d", hp == NULL ? inet_ntoa(sin.sin_addr) 1449 : hp->h_name, ntohs(sin.sin_port)); 1450 } 1451 p += strlen(p); 1452 sprintf(p, "->"); 1453 p += strlen(p); 1454 slen = sizeof sin; 1455 if (getpeername(fd, (struct sockaddr *) &sin, &slen) < 0) 1456 sprintf(p, "(badsock)"); 1457 else 1458 { 1459 hp = gethostbyaddr((char *) &sin.sin_addr, 1460 INADDRSZ, AF_INET); 1461 sprintf(p, "%s/%d", hp == NULL ? inet_ntoa(sin.sin_addr) 1462 : hp->h_name, ntohs(sin.sin_port)); 1463 } 1464 break; 1465 #endif 1466 1467 case S_IFCHR: 1468 sprintf(p, "CHR: "); 1469 p += strlen(p); 1470 goto defprint; 1471 1472 case S_IFBLK: 1473 sprintf(p, "BLK: "); 1474 p += strlen(p); 1475 goto defprint; 1476 1477 #if defined(S_IFIFO) && (!defined(S_IFSOCK) || S_IFIFO != S_IFSOCK) 1478 case S_IFIFO: 1479 sprintf(p, "FIFO: "); 1480 p += strlen(p); 1481 goto defprint; 1482 #endif 1483 1484 #ifdef S_IFDIR 1485 case S_IFDIR: 1486 sprintf(p, "DIR: "); 1487 p += strlen(p); 1488 goto defprint; 1489 #endif 1490 1491 #ifdef S_IFLNK 1492 case S_IFLNK: 1493 sprintf(p, "LNK: "); 1494 p += strlen(p); 1495 goto defprint; 1496 #endif 1497 1498 default: 1499 defprint: 1500 if (sizeof st.st_size > sizeof (long)) 1501 fmtstr = "dev=%d/%d, ino=%d, nlink=%d, u/gid=%d/%d, size=%qd"; 1502 else 1503 fmtstr = "dev=%d/%d, ino=%d, nlink=%d, u/gid=%d/%d, size=%ld"; 1504 sprintf(p, fmtstr, 1505 major(st.st_dev), minor(st.st_dev), st.st_ino, 1506 st.st_nlink, st.st_uid, st.st_gid, st.st_size); 1507 break; 1508 } 1509 1510 printit: 1511 #ifdef LOG 1512 if (logit) 1513 syslog(LOG_DEBUG, "%s", buf); 1514 else 1515 #endif 1516 printf("%s\n", buf); 1517 } 1518 /* 1519 ** SHORTENSTRING -- return short version of a string 1520 ** 1521 ** If the string is already short, just return it. If it is too 1522 ** long, return the head and tail of the string. 1523 ** 1524 ** Parameters: 1525 ** s -- the string to shorten. 1526 ** m -- the max length of the string. 1527 ** 1528 ** Returns: 1529 ** Either s or a short version of s. 1530 */ 1531 1532 #ifndef MAXSHORTSTR 1533 # define MAXSHORTSTR 203 1534 #endif 1535 1536 char * 1537 shortenstring(s, m) 1538 register char *s; 1539 int m; 1540 { 1541 int l; 1542 static char buf[MAXSHORTSTR + 1]; 1543 1544 l = strlen(s); 1545 if (l < m) 1546 return s; 1547 if (m > MAXSHORTSTR) 1548 m = MAXSHORTSTR; 1549 else if (m < 10) 1550 { 1551 if (m < 5) 1552 { 1553 strncpy(buf, s, m); 1554 buf[m] = '\0'; 1555 return buf; 1556 } 1557 strncpy(buf, s, m - 3); 1558 strcpy(buf + m - 3, "..."); 1559 return buf; 1560 } 1561 m = (m - 3) / 2; 1562 strncpy(buf, s, m); 1563 strcpy(buf + m, "..."); 1564 strcpy(buf + m + 3, s + l - m); 1565 return buf; 1566 } 1567 /* 1568 ** GET_COLUMN -- look up a Column in a line buffer 1569 ** 1570 ** Parameters: 1571 ** line -- the raw text line to search. 1572 ** col -- the column number to fetch. 1573 ** delim -- the delimiter between columns. If null, 1574 ** use white space. 1575 ** buf -- the output buffer. 1576 ** 1577 ** Returns: 1578 ** buf if successful. 1579 ** NULL otherwise. 1580 */ 1581 1582 char * 1583 get_column(line, col, delim, buf) 1584 char line[]; 1585 int col; 1586 char delim; 1587 char buf[]; 1588 { 1589 char *p; 1590 char *begin, *end; 1591 int i; 1592 char delimbuf[3]; 1593 1594 if (delim == '\0') 1595 strcpy(delimbuf, "\t "); 1596 else 1597 { 1598 delimbuf[0] = delim; 1599 delimbuf[1] = '\0'; 1600 } 1601 1602 p = line; 1603 if (*p == '\0') 1604 return NULL; /* line empty */ 1605 if (*p == delim && col == 0) 1606 return NULL; /* first column empty */ 1607 1608 begin = line; 1609 1610 if (col == 0 && delim == '\0') 1611 { 1612 while (*begin && isspace(*begin)) 1613 begin++; 1614 } 1615 1616 for (i = 0; i < col; i++) 1617 { 1618 if ((begin = strpbrk(begin, delimbuf)) == NULL) 1619 return NULL; /* no such column */ 1620 begin++; 1621 if (delim == '\0') 1622 { 1623 while (*begin && isspace(*begin)) 1624 begin++; 1625 } 1626 } 1627 1628 end = strpbrk(begin, delimbuf); 1629 if (end == NULL) 1630 { 1631 strcpy(buf, begin); 1632 } 1633 else 1634 { 1635 strncpy(buf, begin, end - begin); 1636 buf[end - begin] = '\0'; 1637 } 1638 return buf; 1639 } 1640 /* 1641 ** CLEANSTRCPY -- copy string keeping out bogus characters 1642 ** 1643 ** Parameters: 1644 ** t -- "to" string. 1645 ** f -- "from" string. 1646 ** l -- length of space available in "to" string. 1647 ** 1648 ** Returns: 1649 ** none. 1650 */ 1651 1652 void 1653 cleanstrcpy(t, f, l) 1654 register char *t; 1655 register char *f; 1656 int l; 1657 { 1658 #ifdef LOG 1659 /* check for newlines and log if necessary */ 1660 (void) denlstring(f, TRUE, TRUE); 1661 #endif 1662 1663 l--; 1664 while (l > 0 && *f != '\0') 1665 { 1666 if (isascii(*f) && 1667 (isalnum(*f) || strchr("!#$%&'*+-./^_`{|}~", *f) != NULL)) 1668 { 1669 l--; 1670 *t++ = *f; 1671 } 1672 f++; 1673 } 1674 *t = '\0'; 1675 } 1676 /* 1677 ** DENLSTRING -- convert newlines in a string to spaces 1678 ** 1679 ** Parameters: 1680 ** s -- the input string 1681 ** strict -- if set, don't permit continuation lines. 1682 ** logattacks -- if set, log attempted attacks. 1683 ** 1684 ** Returns: 1685 ** A pointer to a version of the string with newlines 1686 ** mapped to spaces. This should be copied. 1687 */ 1688 1689 char * 1690 denlstring(s, strict, logattacks) 1691 char *s; 1692 int strict; 1693 int logattacks; 1694 { 1695 register char *p; 1696 int l; 1697 static char *bp = NULL; 1698 static int bl = 0; 1699 1700 p = s; 1701 while ((p = strchr(p, '\n')) != NULL) 1702 if (strict || (*++p != ' ' && *p != '\t')) 1703 break; 1704 if (p == NULL) 1705 return s; 1706 1707 l = strlen(s) + 1; 1708 if (bl < l) 1709 { 1710 /* allocate more space */ 1711 if (bp != NULL) 1712 free(bp); 1713 bp = xalloc(l); 1714 bl = l; 1715 } 1716 strcpy(bp, s); 1717 for (p = bp; (p = strchr(p, '\n')) != NULL; ) 1718 *p++ = ' '; 1719 1720 /* 1721 #ifdef LOG 1722 if (logattacks) 1723 { 1724 syslog(LOG_NOTICE, "POSSIBLE ATTACK from %s: newline in string \"%s\"", 1725 RealHostName == NULL ? "[UNKNOWN]" : RealHostName, 1726 shortenstring(bp, 80)); 1727 } 1728 #endif 1729 */ 1730 1731 return bp; 1732 } 1733