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[] = "@(#)util.c 6.16 (Berkeley) 04/30/93"; 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 p = malloc((unsigned) sz); 78 if (p == NULL) 79 { 80 syserr("Out of memory!!"); 81 abort(); 82 /* exit(EX_UNAVAILABLE); */ 83 } 84 return (p); 85 } 86 /* 87 ** COPYPLIST -- copy list of pointers. 88 ** 89 ** This routine is the equivalent of newstr for lists of 90 ** pointers. 91 ** 92 ** Parameters: 93 ** list -- list of pointers to copy. 94 ** Must be NULL terminated. 95 ** copycont -- if TRUE, copy the contents of the vector 96 ** (which must be a string) also. 97 ** 98 ** Returns: 99 ** a copy of 'list'. 100 ** 101 ** Side Effects: 102 ** none. 103 */ 104 105 char ** 106 copyplist(list, copycont) 107 char **list; 108 bool copycont; 109 { 110 register char **vp; 111 register char **newvp; 112 113 for (vp = list; *vp != NULL; vp++) 114 continue; 115 116 vp++; 117 118 newvp = (char **) xalloc((int) (vp - list) * sizeof *vp); 119 bcopy((char *) list, (char *) newvp, (int) (vp - list) * sizeof *vp); 120 121 if (copycont) 122 { 123 for (vp = newvp; *vp != NULL; vp++) 124 *vp = newstr(*vp); 125 } 126 127 return (newvp); 128 } 129 /* 130 ** COPYQUEUE -- copy address queue. 131 ** 132 ** This routine is the equivalent of newstr for address queues 133 ** addresses marked with QDONTSEND aren't copied 134 ** 135 ** Parameters: 136 ** addr -- list of address structures to copy. 137 ** 138 ** Returns: 139 ** a copy of 'addr'. 140 ** 141 ** Side Effects: 142 ** none. 143 */ 144 145 ADDRESS * 146 copyqueue(addr) 147 ADDRESS *addr; 148 { 149 register ADDRESS *newaddr; 150 ADDRESS *ret; 151 register ADDRESS **tail = &ret; 152 153 while (addr != NULL) 154 { 155 if (!bitset(QDONTSEND, addr->q_flags)) 156 { 157 newaddr = (ADDRESS *) xalloc(sizeof(ADDRESS)); 158 STRUCTCOPY(*addr, *newaddr); 159 *tail = newaddr; 160 tail = &newaddr->q_next; 161 } 162 addr = addr->q_next; 163 } 164 *tail = NULL; 165 166 return ret; 167 } 168 /* 169 ** PRINTAV -- print argument vector. 170 ** 171 ** Parameters: 172 ** av -- argument vector. 173 ** 174 ** Returns: 175 ** none. 176 ** 177 ** Side Effects: 178 ** prints av. 179 */ 180 181 printav(av) 182 register char **av; 183 { 184 while (*av != NULL) 185 { 186 if (tTd(0, 44)) 187 printf("\n\t%08x=", *av); 188 else 189 (void) putchar(' '); 190 xputs(*av++); 191 } 192 (void) putchar('\n'); 193 } 194 /* 195 ** LOWER -- turn letter into lower case. 196 ** 197 ** Parameters: 198 ** c -- character to turn into lower case. 199 ** 200 ** Returns: 201 ** c, in lower case. 202 ** 203 ** Side Effects: 204 ** none. 205 */ 206 207 char 208 lower(c) 209 register char c; 210 { 211 return((isascii(c) && isupper(c)) ? tolower(c) : c); 212 } 213 /* 214 ** XPUTS -- put string doing control escapes. 215 ** 216 ** Parameters: 217 ** s -- string to put. 218 ** 219 ** Returns: 220 ** none. 221 ** 222 ** Side Effects: 223 ** output to stdout 224 */ 225 226 xputs(s) 227 register char *s; 228 { 229 register int c; 230 register struct metamac *mp; 231 extern struct metamac MetaMacros[]; 232 233 if (s == NULL) 234 { 235 printf("<null>"); 236 return; 237 } 238 while ((c = (*s++ & 0377)) != '\0') 239 { 240 if (!isascii(c)) 241 { 242 if (c == MATCHREPL || c == MACROEXPAND) 243 { 244 putchar('$'); 245 continue; 246 } 247 for (mp = MetaMacros; mp->metaname != '\0'; mp++) 248 { 249 if ((mp->metaval & 0377) == c) 250 { 251 printf("$%c", mp->metaname); 252 break; 253 } 254 } 255 if (mp->metaname != '\0') 256 continue; 257 (void) putchar('\\'); 258 c &= 0177; 259 } 260 if (isprint(c)) 261 { 262 putchar(c); 263 continue; 264 } 265 266 /* wasn't a meta-macro -- find another way to print it */ 267 switch (c) 268 { 269 case '\0': 270 continue; 271 272 case '\n': 273 c = 'n'; 274 break; 275 276 case '\r': 277 c = 'r'; 278 break; 279 280 case '\t': 281 c = 't'; 282 break; 283 284 default: 285 (void) putchar('^'); 286 (void) putchar(c ^ 0100); 287 continue; 288 } 289 } 290 (void) fflush(stdout); 291 } 292 /* 293 ** MAKELOWER -- Translate a line into lower case 294 ** 295 ** Parameters: 296 ** p -- the string to translate. If NULL, return is 297 ** immediate. 298 ** 299 ** Returns: 300 ** none. 301 ** 302 ** Side Effects: 303 ** String pointed to by p is translated to lower case. 304 ** 305 ** Called By: 306 ** parse 307 */ 308 309 makelower(p) 310 register char *p; 311 { 312 register char c; 313 314 if (p == NULL) 315 return; 316 for (; (c = *p) != '\0'; p++) 317 if (isascii(c) && isupper(c)) 318 *p = tolower(c); 319 } 320 /* 321 ** BUILDFNAME -- build full name from gecos style entry. 322 ** 323 ** This routine interprets the strange entry that would appear 324 ** in the GECOS field of the password file. 325 ** 326 ** Parameters: 327 ** p -- name to build. 328 ** login -- the login name of this user (for &). 329 ** buf -- place to put the result. 330 ** 331 ** Returns: 332 ** none. 333 ** 334 ** Side Effects: 335 ** none. 336 */ 337 338 buildfname(gecos, login, buf) 339 register char *gecos; 340 char *login; 341 char *buf; 342 { 343 register char *p; 344 register char *bp = buf; 345 int l; 346 347 if (*gecos == '*') 348 gecos++; 349 350 /* find length of final string */ 351 l = 0; 352 for (p = gecos; *p != '\0' && *p != ',' && *p != ';' && *p != '%'; p++) 353 { 354 if (*p == '&') 355 l += strlen(login); 356 else 357 l++; 358 } 359 360 /* now fill in buf */ 361 for (p = gecos; *p != '\0' && *p != ',' && *p != ';' && *p != '%'; p++) 362 { 363 if (*p == '&') 364 { 365 (void) strcpy(bp, login); 366 *bp = toupper(*bp); 367 while (*bp != '\0') 368 bp++; 369 } 370 else 371 *bp++ = *p; 372 } 373 *bp = '\0'; 374 } 375 /* 376 ** SAFEFILE -- return true if a file exists and is safe for a user. 377 ** 378 ** Parameters: 379 ** fn -- filename to check. 380 ** uid -- uid to compare against. 381 ** mode -- mode bits that must match. 382 ** 383 ** Returns: 384 ** 0 if fn exists, is owned by uid, and matches mode. 385 ** An errno otherwise. The actual errno is cleared. 386 ** 387 ** Side Effects: 388 ** none. 389 */ 390 391 int 392 safefile(fn, uid, mode) 393 char *fn; 394 uid_t uid; 395 int mode; 396 { 397 struct stat stbuf; 398 399 if (stat(fn, &stbuf) < 0) 400 { 401 int ret = errno; 402 403 errno = 0; 404 return ret; 405 } 406 if (stbuf.st_uid == uid && (stbuf.st_mode & mode) == mode) 407 return 0; 408 return EPERM; 409 } 410 /* 411 ** FIXCRLF -- fix <CR><LF> in line. 412 ** 413 ** Looks for the <CR><LF> combination and turns it into the 414 ** UNIX canonical <NL> character. It only takes one line, 415 ** i.e., it is assumed that the first <NL> found is the end 416 ** of the line. 417 ** 418 ** Parameters: 419 ** line -- the line to fix. 420 ** stripnl -- if true, strip the newline also. 421 ** 422 ** Returns: 423 ** none. 424 ** 425 ** Side Effects: 426 ** line is changed in place. 427 */ 428 429 fixcrlf(line, stripnl) 430 char *line; 431 bool stripnl; 432 { 433 register char *p; 434 435 p = strchr(line, '\n'); 436 if (p == NULL) 437 return; 438 if (p > line && p[-1] == '\r') 439 p--; 440 if (!stripnl) 441 *p++ = '\n'; 442 *p = '\0'; 443 } 444 /* 445 ** DFOPEN -- determined file open 446 ** 447 ** This routine has the semantics of fopen, except that it will 448 ** keep trying a few times to make this happen. The idea is that 449 ** on very loaded systems, we may run out of resources (inodes, 450 ** whatever), so this tries to get around it. 451 */ 452 453 FILE * 454 dfopen(filename, mode) 455 char *filename; 456 char *mode; 457 { 458 register int tries; 459 register FILE *fp; 460 struct stat st; 461 462 for (tries = 0; tries < 10; tries++) 463 { 464 sleep((unsigned) (10 * tries)); 465 errno = 0; 466 fp = fopen(filename, mode); 467 if (fp != NULL) 468 break; 469 if (errno != ENFILE && errno != EINTR) 470 break; 471 } 472 if (fp != NULL && fstat(fileno(fp), &st) >= 0 && S_ISREG(st.st_mode)) 473 { 474 int locktype; 475 extern bool lockfile(); 476 477 /* lock the file to avoid accidental conflicts */ 478 if (*mode == 'w' || *mode == 'a') 479 locktype = LOCK_EX; 480 else 481 locktype = LOCK_SH; 482 (void) lockfile(fileno(fp), filename, locktype); 483 errno = 0; 484 } 485 return (fp); 486 } 487 /* 488 ** PUTLINE -- put a line like fputs obeying SMTP conventions 489 ** 490 ** This routine always guarantees outputing a newline (or CRLF, 491 ** as appropriate) at the end of the string. 492 ** 493 ** Parameters: 494 ** l -- line to put. 495 ** fp -- file to put it onto. 496 ** m -- the mailer used to control output. 497 ** 498 ** Returns: 499 ** none 500 ** 501 ** Side Effects: 502 ** output of l to fp. 503 */ 504 505 putline(l, fp, m) 506 register char *l; 507 FILE *fp; 508 MAILER *m; 509 { 510 register char *p; 511 register char svchar; 512 513 /* strip out 0200 bits -- these can look like TELNET protocol */ 514 if (bitnset(M_7BITS, m->m_flags)) 515 { 516 for (p = l; svchar = *p; ++p) 517 if (svchar & 0200) 518 *p = svchar &~ 0200; 519 } 520 521 do 522 { 523 /* find the end of the line */ 524 p = strchr(l, '\n'); 525 if (p == NULL) 526 p = &l[strlen(l)]; 527 528 /* check for line overflow */ 529 while (m->m_linelimit > 0 && (p - l) > m->m_linelimit) 530 { 531 register char *q = &l[m->m_linelimit - 1]; 532 533 svchar = *q; 534 *q = '\0'; 535 if (l[0] == '.' && bitnset(M_XDOT, m->m_flags)) 536 (void) putc('.', fp); 537 fputs(l, fp); 538 (void) putc('!', fp); 539 fputs(m->m_eol, fp); 540 *q = svchar; 541 l = q; 542 } 543 544 /* output last part */ 545 if (l[0] == '.' && bitnset(M_XDOT, m->m_flags)) 546 (void) putc('.', fp); 547 for ( ; l < p; ++l) 548 (void) putc(*l, fp); 549 fputs(m->m_eol, fp); 550 if (*l == '\n') 551 ++l; 552 } while (l[0] != '\0'); 553 } 554 /* 555 ** XUNLINK -- unlink a file, doing logging as appropriate. 556 ** 557 ** Parameters: 558 ** f -- name of file to unlink. 559 ** 560 ** Returns: 561 ** none. 562 ** 563 ** Side Effects: 564 ** f is unlinked. 565 */ 566 567 xunlink(f) 568 char *f; 569 { 570 register int i; 571 572 # ifdef LOG 573 if (LogLevel > 98) 574 syslog(LOG_DEBUG, "%s: unlink %s", CurEnv->e_id, f); 575 # endif /* LOG */ 576 577 i = unlink(f); 578 # ifdef LOG 579 if (i < 0 && LogLevel > 97) 580 syslog(LOG_DEBUG, "%s: unlink-fail %d", f, errno); 581 # endif /* LOG */ 582 } 583 /* 584 ** XFCLOSE -- close a file, doing logging as appropriate. 585 ** 586 ** Parameters: 587 ** fp -- file pointer for the file to close 588 ** a, b -- miscellaneous crud to print for debugging 589 ** 590 ** Returns: 591 ** none. 592 ** 593 ** Side Effects: 594 ** fp is closed. 595 */ 596 597 xfclose(fp, a, b) 598 FILE *fp; 599 char *a, *b; 600 { 601 if (tTd(53, 99)) 602 printf("xfclose(%x) %s %s\n", fp, a, b); 603 if (fclose(fp) < 0 && tTd(53, 99)) 604 printf("xfclose FAILURE: %s\n", errstring(errno)); 605 } 606 /* 607 ** SFGETS -- "safe" fgets -- times out and ignores random interrupts. 608 ** 609 ** Parameters: 610 ** buf -- place to put the input line. 611 ** siz -- size of buf. 612 ** fp -- file to read from. 613 ** timeout -- the timeout before error occurs. 614 ** 615 ** Returns: 616 ** NULL on error (including timeout). This will also leave 617 ** buf containing a null string. 618 ** buf otherwise. 619 ** 620 ** Side Effects: 621 ** none. 622 */ 623 624 static jmp_buf CtxReadTimeout; 625 626 char * 627 sfgets(buf, siz, fp, timeout) 628 char *buf; 629 int siz; 630 FILE *fp; 631 time_t timeout; 632 { 633 register EVENT *ev = NULL; 634 register char *p; 635 static int readtimeout(); 636 637 /* set the timeout */ 638 if (timeout != 0) 639 { 640 if (setjmp(CtxReadTimeout) != 0) 641 { 642 # ifdef LOG 643 syslog(LOG_NOTICE, 644 "timeout waiting for input from %s\n", 645 CurHostName? CurHostName: "local"); 646 # endif 647 errno = 0; 648 usrerr("451 timeout waiting for input"); 649 buf[0] = '\0'; 650 return (NULL); 651 } 652 ev = setevent(timeout, readtimeout, 0); 653 } 654 655 /* try to read */ 656 p = NULL; 657 while (p == NULL && !feof(fp) && !ferror(fp)) 658 { 659 errno = 0; 660 p = fgets(buf, siz, fp); 661 if (errno == EINTR) 662 clearerr(fp); 663 } 664 665 /* clear the event if it has not sprung */ 666 clrevent(ev); 667 668 /* clean up the books and exit */ 669 LineNumber++; 670 if (p == NULL) 671 { 672 buf[0] = '\0'; 673 return (NULL); 674 } 675 if (!EightBit) 676 for (p = buf; *p != '\0'; p++) 677 *p &= ~0200; 678 return (buf); 679 } 680 681 static 682 readtimeout() 683 { 684 longjmp(CtxReadTimeout, 1); 685 } 686 /* 687 ** FGETFOLDED -- like fgets, but know about folded lines. 688 ** 689 ** Parameters: 690 ** buf -- place to put result. 691 ** n -- bytes available. 692 ** f -- file to read from. 693 ** 694 ** Returns: 695 ** input line(s) on success, NULL on error or EOF. 696 ** This will normally be buf -- unless the line is too 697 ** long, when it will be xalloc()ed. 698 ** 699 ** Side Effects: 700 ** buf gets lines from f, with continuation lines (lines 701 ** with leading white space) appended. CRLF's are mapped 702 ** into single newlines. Any trailing NL is stripped. 703 */ 704 705 char * 706 fgetfolded(buf, n, f) 707 char *buf; 708 register int n; 709 FILE *f; 710 { 711 register char *p = buf; 712 char *bp = buf; 713 register int i; 714 715 n--; 716 while ((i = getc(f)) != EOF) 717 { 718 if (i == '\r') 719 { 720 i = getc(f); 721 if (i != '\n') 722 { 723 if (i != EOF) 724 (void) ungetc(i, f); 725 i = '\r'; 726 } 727 } 728 if (--n <= 0) 729 { 730 /* allocate new space */ 731 char *nbp; 732 int nn; 733 734 nn = (p - bp); 735 if (nn < MEMCHUNKSIZE) 736 nn *= 2; 737 else 738 nn += MEMCHUNKSIZE; 739 nbp = xalloc(nn); 740 bcopy(bp, nbp, p - bp); 741 p = &nbp[p - bp]; 742 if (bp != buf) 743 free(bp); 744 bp = nbp; 745 n = nn - (p - bp); 746 } 747 *p++ = i; 748 if (i == '\n') 749 { 750 LineNumber++; 751 i = getc(f); 752 if (i != EOF) 753 (void) ungetc(i, f); 754 if (i != ' ' && i != '\t') 755 break; 756 } 757 } 758 if (p == bp) 759 return (NULL); 760 *--p = '\0'; 761 return (bp); 762 } 763 /* 764 ** CURTIME -- return current time. 765 ** 766 ** Parameters: 767 ** none. 768 ** 769 ** Returns: 770 ** the current time. 771 ** 772 ** Side Effects: 773 ** none. 774 */ 775 776 time_t 777 curtime() 778 { 779 auto time_t t; 780 781 (void) time(&t); 782 return (t); 783 } 784 /* 785 ** ATOBOOL -- convert a string representation to boolean. 786 ** 787 ** Defaults to "TRUE" 788 ** 789 ** Parameters: 790 ** s -- string to convert. Takes "tTyY" as true, 791 ** others as false. 792 ** 793 ** Returns: 794 ** A boolean representation of the string. 795 ** 796 ** Side Effects: 797 ** none. 798 */ 799 800 bool 801 atobool(s) 802 register char *s; 803 { 804 if (*s == '\0' || strchr("tTyY", *s) != NULL) 805 return (TRUE); 806 return (FALSE); 807 } 808 /* 809 ** ATOOCT -- convert a string representation to octal. 810 ** 811 ** Parameters: 812 ** s -- string to convert. 813 ** 814 ** Returns: 815 ** An integer representing the string interpreted as an 816 ** octal number. 817 ** 818 ** Side Effects: 819 ** none. 820 */ 821 822 atooct(s) 823 register char *s; 824 { 825 register int i = 0; 826 827 while (*s >= '0' && *s <= '7') 828 i = (i << 3) | (*s++ - '0'); 829 return (i); 830 } 831 /* 832 ** WAITFOR -- wait for a particular process id. 833 ** 834 ** Parameters: 835 ** pid -- process id to wait for. 836 ** 837 ** Returns: 838 ** status of pid. 839 ** -1 if pid never shows up. 840 ** 841 ** Side Effects: 842 ** none. 843 */ 844 845 waitfor(pid) 846 int pid; 847 { 848 auto int st; 849 int i; 850 851 do 852 { 853 errno = 0; 854 i = wait(&st); 855 } while ((i >= 0 || errno == EINTR) && i != pid); 856 if (i < 0) 857 st = -1; 858 return (st); 859 } 860 /* 861 ** BITINTERSECT -- tell if two bitmaps intersect 862 ** 863 ** Parameters: 864 ** a, b -- the bitmaps in question 865 ** 866 ** Returns: 867 ** TRUE if they have a non-null intersection 868 ** FALSE otherwise 869 ** 870 ** Side Effects: 871 ** none. 872 */ 873 874 bool 875 bitintersect(a, b) 876 BITMAP a; 877 BITMAP b; 878 { 879 int i; 880 881 for (i = BITMAPBYTES / sizeof (int); --i >= 0; ) 882 if ((a[i] & b[i]) != 0) 883 return (TRUE); 884 return (FALSE); 885 } 886 /* 887 ** BITZEROP -- tell if a bitmap is all zero 888 ** 889 ** Parameters: 890 ** map -- the bit map to check 891 ** 892 ** Returns: 893 ** TRUE if map is all zero. 894 ** FALSE if there are any bits set in map. 895 ** 896 ** Side Effects: 897 ** none. 898 */ 899 900 bool 901 bitzerop(map) 902 BITMAP map; 903 { 904 int i; 905 906 for (i = BITMAPBYTES / sizeof (int); --i >= 0; ) 907 if (map[i] != 0) 908 return (FALSE); 909 return (TRUE); 910 } 911 /* 912 ** STRCONTAINEDIN -- tell if one string is contained in another 913 ** 914 ** Parameters: 915 ** a -- possible substring. 916 ** b -- possible superstring. 917 ** 918 ** Returns: 919 ** TRUE if a is contained in b. 920 ** FALSE otherwise. 921 */ 922 923 bool 924 strcontainedin(a, b) 925 register char *a; 926 register char *b; 927 { 928 int l; 929 930 l = strlen(a); 931 for (;;) 932 { 933 b = strchr(b, a[0]); 934 if (b == NULL) 935 return FALSE; 936 if (strncmp(a, b, l) == 0) 937 return TRUE; 938 b++; 939 } 940 } 941