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 6.18 (Berkeley) 05/05/93"; 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 struct omodes 454 { 455 int mask; 456 int mode; 457 char *farg; 458 } OpenModes[] = 459 { 460 O_ACCMODE, O_RDONLY, "r", 461 O_ACCMODE|O_APPEND, O_WRONLY, "w", 462 O_ACCMODE|O_APPEND, O_WRONLY|O_APPEND, "a", 463 O_TRUNC, 0, "w+", 464 O_APPEND, O_APPEND, "a+", 465 0, 0, "r+", 466 }; 467 468 FILE * 469 dfopen(filename, omode, cmode) 470 char *filename; 471 int omode; 472 int cmode; 473 { 474 register int tries; 475 FILE *fp; 476 int fd; 477 register struct omodes *om; 478 struct stat st; 479 480 for (om = OpenModes; om->mask != 0; om++) 481 if ((omode & om->mask) == om->mode) 482 break; 483 484 for (tries = 0; tries < 10; tries++) 485 { 486 sleep((unsigned) (10 * tries)); 487 errno = 0; 488 fd = open(filename, omode, cmode); 489 if (fd >= 0) 490 break; 491 if (errno != ENFILE && errno != EINTR) 492 break; 493 } 494 if (fd >= 0 && fstat(fd, &st) >= 0 && S_ISREG(st.st_mode)) 495 { 496 int locktype; 497 extern bool lockfile(); 498 499 /* lock the file to avoid accidental conflicts */ 500 if ((omode & O_ACCMODE) != O_RDONLY) 501 locktype = LOCK_EX; 502 else 503 locktype = LOCK_SH; 504 (void) lockfile(fd, filename, locktype); 505 errno = 0; 506 } 507 return fdopen(fd, om->farg); 508 } 509 /* 510 ** PUTLINE -- put a line like fputs obeying SMTP conventions 511 ** 512 ** This routine always guarantees outputing a newline (or CRLF, 513 ** as appropriate) at the end of the string. 514 ** 515 ** Parameters: 516 ** l -- line to put. 517 ** fp -- file to put it onto. 518 ** m -- the mailer used to control output. 519 ** 520 ** Returns: 521 ** none 522 ** 523 ** Side Effects: 524 ** output of l to fp. 525 */ 526 527 putline(l, fp, m) 528 register char *l; 529 FILE *fp; 530 MAILER *m; 531 { 532 register char *p; 533 register char svchar; 534 535 /* strip out 0200 bits -- these can look like TELNET protocol */ 536 if (bitnset(M_7BITS, m->m_flags)) 537 { 538 for (p = l; svchar = *p; ++p) 539 if (svchar & 0200) 540 *p = svchar &~ 0200; 541 } 542 543 do 544 { 545 /* find the end of the line */ 546 p = strchr(l, '\n'); 547 if (p == NULL) 548 p = &l[strlen(l)]; 549 550 /* check for line overflow */ 551 while (m->m_linelimit > 0 && (p - l) > m->m_linelimit) 552 { 553 register char *q = &l[m->m_linelimit - 1]; 554 555 svchar = *q; 556 *q = '\0'; 557 if (l[0] == '.' && bitnset(M_XDOT, m->m_flags)) 558 (void) putc('.', fp); 559 fputs(l, fp); 560 (void) putc('!', fp); 561 fputs(m->m_eol, fp); 562 *q = svchar; 563 l = q; 564 } 565 566 /* output last part */ 567 if (l[0] == '.' && bitnset(M_XDOT, m->m_flags)) 568 (void) putc('.', fp); 569 for ( ; l < p; ++l) 570 (void) putc(*l, fp); 571 fputs(m->m_eol, fp); 572 if (*l == '\n') 573 ++l; 574 } while (l[0] != '\0'); 575 } 576 /* 577 ** XUNLINK -- unlink a file, doing logging as appropriate. 578 ** 579 ** Parameters: 580 ** f -- name of file to unlink. 581 ** 582 ** Returns: 583 ** none. 584 ** 585 ** Side Effects: 586 ** f is unlinked. 587 */ 588 589 xunlink(f) 590 char *f; 591 { 592 register int i; 593 594 # ifdef LOG 595 if (LogLevel > 98) 596 syslog(LOG_DEBUG, "%s: unlink %s", CurEnv->e_id, f); 597 # endif /* LOG */ 598 599 i = unlink(f); 600 # ifdef LOG 601 if (i < 0 && LogLevel > 97) 602 syslog(LOG_DEBUG, "%s: unlink-fail %d", f, errno); 603 # endif /* LOG */ 604 } 605 /* 606 ** XFCLOSE -- close a file, doing logging as appropriate. 607 ** 608 ** Parameters: 609 ** fp -- file pointer for the file to close 610 ** a, b -- miscellaneous crud to print for debugging 611 ** 612 ** Returns: 613 ** none. 614 ** 615 ** Side Effects: 616 ** fp is closed. 617 */ 618 619 xfclose(fp, a, b) 620 FILE *fp; 621 char *a, *b; 622 { 623 if (tTd(53, 99)) 624 printf("xfclose(%x) %s %s\n", fp, a, b); 625 if (fclose(fp) < 0 && tTd(53, 99)) 626 printf("xfclose FAILURE: %s\n", errstring(errno)); 627 } 628 /* 629 ** SFGETS -- "safe" fgets -- times out and ignores random interrupts. 630 ** 631 ** Parameters: 632 ** buf -- place to put the input line. 633 ** siz -- size of buf. 634 ** fp -- file to read from. 635 ** timeout -- the timeout before error occurs. 636 ** 637 ** Returns: 638 ** NULL on error (including timeout). This will also leave 639 ** buf containing a null string. 640 ** buf otherwise. 641 ** 642 ** Side Effects: 643 ** none. 644 */ 645 646 static jmp_buf CtxReadTimeout; 647 648 char * 649 sfgets(buf, siz, fp, timeout) 650 char *buf; 651 int siz; 652 FILE *fp; 653 time_t timeout; 654 { 655 register EVENT *ev = NULL; 656 register char *p; 657 static int readtimeout(); 658 659 /* set the timeout */ 660 if (timeout != 0) 661 { 662 if (setjmp(CtxReadTimeout) != 0) 663 { 664 # ifdef LOG 665 syslog(LOG_NOTICE, 666 "timeout waiting for input from %s\n", 667 CurHostName? CurHostName: "local"); 668 # endif 669 errno = 0; 670 usrerr("451 timeout waiting for input"); 671 buf[0] = '\0'; 672 return (NULL); 673 } 674 ev = setevent(timeout, readtimeout, 0); 675 } 676 677 /* try to read */ 678 p = NULL; 679 while (p == NULL && !feof(fp) && !ferror(fp)) 680 { 681 errno = 0; 682 p = fgets(buf, siz, fp); 683 if (errno == EINTR) 684 clearerr(fp); 685 } 686 687 /* clear the event if it has not sprung */ 688 clrevent(ev); 689 690 /* clean up the books and exit */ 691 LineNumber++; 692 if (p == NULL) 693 { 694 buf[0] = '\0'; 695 return (NULL); 696 } 697 if (SevenBit) 698 for (p = buf; *p != '\0'; p++) 699 *p &= ~0200; 700 return (buf); 701 } 702 703 static 704 readtimeout() 705 { 706 longjmp(CtxReadTimeout, 1); 707 } 708 /* 709 ** FGETFOLDED -- like fgets, but know about folded lines. 710 ** 711 ** Parameters: 712 ** buf -- place to put result. 713 ** n -- bytes available. 714 ** f -- file to read from. 715 ** 716 ** Returns: 717 ** input line(s) on success, NULL on error or EOF. 718 ** This will normally be buf -- unless the line is too 719 ** long, when it will be xalloc()ed. 720 ** 721 ** Side Effects: 722 ** buf gets lines from f, with continuation lines (lines 723 ** with leading white space) appended. CRLF's are mapped 724 ** into single newlines. Any trailing NL is stripped. 725 */ 726 727 char * 728 fgetfolded(buf, n, f) 729 char *buf; 730 register int n; 731 FILE *f; 732 { 733 register char *p = buf; 734 char *bp = buf; 735 register int i; 736 737 n--; 738 while ((i = getc(f)) != EOF) 739 { 740 if (i == '\r') 741 { 742 i = getc(f); 743 if (i != '\n') 744 { 745 if (i != EOF) 746 (void) ungetc(i, f); 747 i = '\r'; 748 } 749 } 750 if (--n <= 0) 751 { 752 /* allocate new space */ 753 char *nbp; 754 int nn; 755 756 nn = (p - bp); 757 if (nn < MEMCHUNKSIZE) 758 nn *= 2; 759 else 760 nn += MEMCHUNKSIZE; 761 nbp = xalloc(nn); 762 bcopy(bp, nbp, p - bp); 763 p = &nbp[p - bp]; 764 if (bp != buf) 765 free(bp); 766 bp = nbp; 767 n = nn - (p - bp); 768 } 769 *p++ = i; 770 if (i == '\n') 771 { 772 LineNumber++; 773 i = getc(f); 774 if (i != EOF) 775 (void) ungetc(i, f); 776 if (i != ' ' && i != '\t') 777 break; 778 } 779 } 780 if (p == bp) 781 return (NULL); 782 *--p = '\0'; 783 return (bp); 784 } 785 /* 786 ** CURTIME -- return current time. 787 ** 788 ** Parameters: 789 ** none. 790 ** 791 ** Returns: 792 ** the current time. 793 ** 794 ** Side Effects: 795 ** none. 796 */ 797 798 time_t 799 curtime() 800 { 801 auto time_t t; 802 803 (void) time(&t); 804 return (t); 805 } 806 /* 807 ** ATOBOOL -- convert a string representation to boolean. 808 ** 809 ** Defaults to "TRUE" 810 ** 811 ** Parameters: 812 ** s -- string to convert. Takes "tTyY" as true, 813 ** others as false. 814 ** 815 ** Returns: 816 ** A boolean representation of the string. 817 ** 818 ** Side Effects: 819 ** none. 820 */ 821 822 bool 823 atobool(s) 824 register char *s; 825 { 826 if (*s == '\0' || strchr("tTyY", *s) != NULL) 827 return (TRUE); 828 return (FALSE); 829 } 830 /* 831 ** ATOOCT -- convert a string representation to octal. 832 ** 833 ** Parameters: 834 ** s -- string to convert. 835 ** 836 ** Returns: 837 ** An integer representing the string interpreted as an 838 ** octal number. 839 ** 840 ** Side Effects: 841 ** none. 842 */ 843 844 atooct(s) 845 register char *s; 846 { 847 register int i = 0; 848 849 while (*s >= '0' && *s <= '7') 850 i = (i << 3) | (*s++ - '0'); 851 return (i); 852 } 853 /* 854 ** WAITFOR -- wait for a particular process id. 855 ** 856 ** Parameters: 857 ** pid -- process id to wait for. 858 ** 859 ** Returns: 860 ** status of pid. 861 ** -1 if pid never shows up. 862 ** 863 ** Side Effects: 864 ** none. 865 */ 866 867 waitfor(pid) 868 int pid; 869 { 870 auto int st; 871 int i; 872 873 do 874 { 875 errno = 0; 876 i = wait(&st); 877 } while ((i >= 0 || errno == EINTR) && i != pid); 878 if (i < 0) 879 st = -1; 880 return (st); 881 } 882 /* 883 ** BITINTERSECT -- tell if two bitmaps intersect 884 ** 885 ** Parameters: 886 ** a, b -- the bitmaps in question 887 ** 888 ** Returns: 889 ** TRUE if they have a non-null intersection 890 ** FALSE otherwise 891 ** 892 ** Side Effects: 893 ** none. 894 */ 895 896 bool 897 bitintersect(a, b) 898 BITMAP a; 899 BITMAP b; 900 { 901 int i; 902 903 for (i = BITMAPBYTES / sizeof (int); --i >= 0; ) 904 if ((a[i] & b[i]) != 0) 905 return (TRUE); 906 return (FALSE); 907 } 908 /* 909 ** BITZEROP -- tell if a bitmap is all zero 910 ** 911 ** Parameters: 912 ** map -- the bit map to check 913 ** 914 ** Returns: 915 ** TRUE if map is all zero. 916 ** FALSE if there are any bits set in map. 917 ** 918 ** Side Effects: 919 ** none. 920 */ 921 922 bool 923 bitzerop(map) 924 BITMAP map; 925 { 926 int i; 927 928 for (i = BITMAPBYTES / sizeof (int); --i >= 0; ) 929 if (map[i] != 0) 930 return (FALSE); 931 return (TRUE); 932 } 933 /* 934 ** STRCONTAINEDIN -- tell if one string is contained in another 935 ** 936 ** Parameters: 937 ** a -- possible substring. 938 ** b -- possible superstring. 939 ** 940 ** Returns: 941 ** TRUE if a is contained in b. 942 ** FALSE otherwise. 943 */ 944 945 bool 946 strcontainedin(a, b) 947 register char *a; 948 register char *b; 949 { 950 int l; 951 952 l = strlen(a); 953 for (;;) 954 { 955 b = strchr(b, a[0]); 956 if (b == NULL) 957 return FALSE; 958 if (strncmp(a, b, l) == 0) 959 return TRUE; 960 b++; 961 } 962 } 963