1 /* $NetBSD: support.c,v 1.22 2009/04/10 13:08:25 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)aux.c 8.1 (Berkeley) 6/6/93"; 36 #else 37 __RCSID("$NetBSD: support.c,v 1.22 2009/04/10 13:08:25 christos Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <stdarg.h> 42 #include <util.h> 43 44 #include "rcv.h" 45 #include "extern.h" 46 #include "mime.h" 47 #include "thread.h" 48 49 /* 50 * Mail -- a mail program 51 * 52 * Auxiliary functions. 53 */ 54 55 56 /* 57 * Return a pointer to a dynamic copy of the argument. 58 */ 59 PUBLIC char * 60 savestr(const char *str) 61 { 62 char *new; 63 size_t size = strlen(str) + 1; 64 65 if ((new = salloc(size)) != NULL) 66 (void)memmove(new, str, size); 67 return new; 68 } 69 70 /* 71 * Make a copy of new argument incorporating old one. 72 */ 73 static char * 74 save2str(char *str, char *old) 75 { 76 char *new; 77 size_t newsize = strlen(str) + 1; 78 size_t oldsize = old ? strlen(old) + 1 : 0; 79 80 if ((new = salloc(newsize + oldsize)) != NULL) { 81 if (oldsize) { 82 (void)memmove(new, old, oldsize); 83 new[oldsize - 1] = ' '; 84 } 85 (void)memmove(new + oldsize, str, newsize); 86 } 87 return new; 88 } 89 90 /* 91 * Like asprintf(), but with result salloc-ed rather than malloc-ed. 92 */ 93 PUBLIC int 94 sasprintf(char **ret, const char *format, ...) 95 { 96 int rval; 97 char *p; 98 va_list args; 99 100 va_start(args, format); 101 rval = evasprintf(&p, format, args); 102 *ret = savestr(p); 103 free(p); 104 va_end(args); 105 return rval; 106 } 107 108 struct set_m_flag_args_s { 109 int and_bits; 110 int xor_bits; 111 }; 112 static int 113 set_m_flag_core(struct message *mp, void *v) 114 { 115 struct set_m_flag_args_s *args; 116 args = v; 117 mp->m_flag &= args->and_bits; 118 mp->m_flag ^= args->xor_bits; 119 return 0; 120 } 121 122 PUBLIC struct message * 123 set_m_flag(int msgnum, int and_bits, int xor_bits) 124 { 125 struct message *mp; 126 struct set_m_flag_args_s args; 127 mp = get_message(msgnum); 128 args.and_bits = and_bits; 129 args.xor_bits = xor_bits; 130 (void)thread_recursion(mp, set_m_flag_core, &args); 131 return mp; 132 } 133 134 /* 135 * Touch the named message by setting its MTOUCH flag. 136 * Touched messages have the effect of not being sent 137 * back to the system mailbox on exit. 138 */ 139 PUBLIC void 140 touch(struct message *mp) 141 { 142 143 mp->m_flag |= MTOUCH; 144 if ((mp->m_flag & MREAD) == 0) 145 mp->m_flag |= MREAD|MSTATUS; 146 } 147 148 /* 149 * Test to see if the passed file name is a directory. 150 * Return true if it is. 151 */ 152 PUBLIC int 153 isdir(const char name[]) 154 { 155 struct stat sbuf; 156 157 if (stat(name, &sbuf) < 0) 158 return 0; 159 return S_ISDIR(sbuf.st_mode); 160 } 161 162 /* 163 * Count the number of arguments in the given string raw list. 164 */ 165 PUBLIC int 166 argcount(char **argv) 167 { 168 char **ap; 169 170 for (ap = argv; *ap++ != NULL; /*EMPTY*/) 171 continue; 172 return (int)(ap - argv - 1); 173 } 174 175 /* 176 * Check whether the passed line is a header line of 177 * the desired breed. Return the field body, or NULL. 178 */ 179 static char* 180 ishfield(const char linebuf[], char *colon, const char field[]) 181 { 182 char *cp = colon; 183 184 *cp = 0; 185 if (strcasecmp(linebuf, field) != 0) { 186 *cp = ':'; 187 return NULL; 188 } 189 *cp = ':'; 190 for (cp++; is_WSP(*cp); cp++) 191 continue; 192 return cp; 193 } 194 195 /* 196 * Return the next header field found in the given message. 197 * Return >= 0 if something found, < 0 elsewise. 198 * "colon" is set to point to the colon in the header. 199 * Must deal with \ continuations & other such fraud. 200 * 201 * WARNING - do not call this outside hfield() or decoding will not 202 * get done. 203 */ 204 static int 205 gethfield(FILE *f, char linebuf[], int rem, char **colon) 206 { 207 char line2[LINESIZE]; 208 char *cp, *cp2; 209 int c; 210 211 for (;;) { 212 if (--rem < 0) 213 return -1; 214 if ((c = readline(f, linebuf, LINESIZE, 0)) <= 0) 215 return -1; 216 for (cp = linebuf; 217 isprint((unsigned char)*cp) && *cp != ' ' && *cp != ':'; 218 cp++) 219 continue; 220 if (*cp != ':' || cp == linebuf) 221 continue; 222 /* 223 * I guess we got a headline. 224 * Handle wraparounding 225 */ 226 *colon = cp; 227 cp = linebuf + c; 228 for (;;) { 229 while (--cp >= linebuf && is_WSP(*cp)) 230 continue; 231 cp++; 232 if (rem <= 0) 233 break; 234 (void)ungetc(c = getc(f), f); 235 if (!is_WSP(c)) 236 break; 237 if ((c = readline(f, line2, LINESIZE, 0)) < 0) 238 break; 239 rem--; 240 cp2 = skip_WSP(line2); 241 c -= (int)(cp2 - line2); 242 if (cp + c >= linebuf + LINESIZE - 2) 243 break; 244 *cp++ = ' '; 245 (void)memmove(cp, cp2, (size_t)c); 246 cp += c; 247 } 248 *cp = 0; 249 return rem; 250 } 251 /* NOTREACHED */ 252 } 253 254 /* 255 * Return the desired header line from the passed message 256 * pointer (or NULL if the desired header field is not available). 257 */ 258 PUBLIC char * 259 hfield(const char field[], const struct message *mp) 260 { 261 FILE *ibuf; 262 char linebuf[LINESIZE]; 263 int lc; 264 char *headerfield; 265 char *colon, *oldhfield = NULL; 266 #ifdef MIME_SUPPORT 267 int decode; 268 269 decode = value(ENAME_MIME_DECODE_MSG) && 270 value(ENAME_MIME_DECODE_HDR); 271 #endif 272 273 ibuf = setinput(mp); 274 if ((lc = (int)(mp->m_lines - 1)) < 0) 275 return NULL; 276 if (readline(ibuf, linebuf, LINESIZE, 0) < 0) 277 return NULL; 278 while (lc > 0) { 279 if ((lc = gethfield(ibuf, linebuf, lc, &colon)) < 0) 280 return oldhfield; 281 #ifdef MIME_SUPPORT 282 if ((headerfield = ishfield(linebuf, colon, field)) != NULL) { 283 char linebuf2[LINESIZE]; 284 if (decode) 285 headerfield = mime_decode_hfield(linebuf2, 286 sizeof(linebuf2), linebuf, headerfield); 287 oldhfield = save2str(headerfield, oldhfield); 288 } 289 #else 290 if ((headerfield = ishfield(linebuf, colon, field)) != NULL) 291 oldhfield = save2str(headerfield, oldhfield); 292 #endif 293 } 294 return oldhfield; 295 } 296 297 /* 298 * Copy a string, lowercasing it as we go. 299 */ 300 PUBLIC void 301 istrcpy(char *dest, const char *src) 302 { 303 304 do { 305 *dest++ = tolower((unsigned char)*src); 306 } while (*src++ != 0); 307 } 308 309 /* 310 * The following code deals with input stacking to do source 311 * commands. All but the current file pointer are saved on 312 * the stack. 313 */ 314 315 static int ssp; /* Top of file stack */ 316 static struct sstack { 317 FILE *s_file; /* File we were in. */ 318 int s_cond; /* Saved state of conditionals */ 319 #ifdef NEW_CONDITIONAL 320 struct cond_stack_s *s_cond_stack; /* Saved conditional stack */ 321 #endif 322 int s_loading; /* Loading .mailrc, etc. */ 323 } sstack[NOFILE]; 324 325 /* 326 * Pushdown current input file and switch to a new one. 327 * Set the global flag "sourcing" so that others will realize 328 * that they are no longer reading from a tty (in all probability). 329 */ 330 PUBLIC int 331 source(void *v) 332 { 333 char **arglist = v; 334 FILE *fi; 335 const char *cp; 336 337 if ((cp = expand(*arglist)) == NULL) 338 return 1; 339 if ((fi = Fopen(cp, "r")) == NULL) { 340 warn("%s", cp); 341 return 1; 342 } 343 if (ssp >= NOFILE - 1) { 344 (void)printf("Too much \"sourcing\" going on.\n"); 345 (void)Fclose(fi); 346 return 1; 347 } 348 sstack[ssp].s_file = input; 349 sstack[ssp].s_cond = cond; 350 #ifdef NEW_CONDITIONAL 351 sstack[ssp].s_cond_stack = cond_stack; 352 #endif 353 sstack[ssp].s_loading = loading; 354 ssp++; 355 loading = 0; 356 cond = CNONE; 357 input = fi; 358 sourcing++; 359 return 0; 360 } 361 362 /* 363 * Pop the current input back to the previous level. 364 * Update the "sourcing" flag as appropriate. 365 */ 366 PUBLIC int 367 unstack(void) 368 { 369 if (ssp <= 0) { 370 (void)printf("\"Source\" stack over-pop.\n"); 371 sourcing = 0; 372 return 1; 373 } 374 (void)Fclose(input); 375 if (cond != CNONE || cond_stack != NULL) 376 (void)printf("Unmatched \"if\"\n"); 377 ssp--; 378 input = sstack[ssp].s_file; 379 cond = sstack[ssp].s_cond; 380 #ifdef NEW_CONDITIONAL 381 cond_stack = sstack[ssp].s_cond_stack; 382 #endif 383 loading = sstack[ssp].s_loading; 384 if (ssp == 0) 385 sourcing = loading; 386 return 0; 387 } 388 389 /* 390 * Touch the indicated file. 391 * This is nifty for the shell. 392 */ 393 PUBLIC void 394 alter(char *name) 395 { 396 struct stat sb; 397 struct timeval tv[2]; 398 399 if (stat(name, &sb)) 400 return; 401 (void)gettimeofday(&tv[0], NULL); 402 tv[0].tv_sec++; 403 TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec); 404 (void)utimes(name, tv); 405 } 406 407 /* 408 * Examine the passed line buffer and 409 * return true if it is all blanks and tabs. 410 */ 411 PUBLIC int 412 blankline(char linebuf[]) 413 { 414 char *cp; 415 416 for (cp = linebuf; *cp; cp++) 417 if (!is_WSP(*cp)) 418 return 0; 419 return 1; 420 } 421 422 /* 423 * Start of a "comment". 424 * Ignore it. 425 */ 426 static char * 427 skip_comment(char *cp) 428 { 429 int nesting = 1; 430 431 for (/*EMPTY*/; nesting > 0 && *cp; cp++) { 432 switch (*cp) { 433 case '\\': 434 if (cp[1]) 435 cp++; 436 break; 437 case '(': 438 nesting++; 439 break; 440 case ')': 441 nesting--; 442 break; 443 } 444 } 445 return cp; 446 } 447 448 /* 449 * Skin an arpa net address according to the RFC 822 interpretation 450 * of "host-phrase." 451 */ 452 PUBLIC char * 453 skin(char *name) 454 { 455 int c; 456 char *cp, *cp2; 457 char *bufend; 458 int gotlt, lastsp; 459 char nbuf[LINESIZE]; 460 461 if (name == NULL) 462 return NULL; 463 if (strchr(name, '(') == NULL && strchr(name, '<') == NULL 464 && strchr(name, ' ') == NULL) 465 return name; 466 gotlt = 0; 467 lastsp = 0; 468 bufend = nbuf; 469 for (cp = name, cp2 = bufend; (c = *cp++) != '\0'; /*EMPTY*/) { 470 switch (c) { 471 case '(': 472 cp = skip_comment(cp); 473 lastsp = 0; 474 break; 475 476 case '"': 477 /* 478 * Start of a "quoted-string". 479 * Copy it in its entirety. 480 */ 481 while ((c = *cp) != '\0') { 482 cp++; 483 if (c == '"') 484 break; 485 if (c != '\\') 486 *cp2++ = c; 487 else if ((c = *cp) != '\0') { 488 *cp2++ = c; 489 cp++; 490 } 491 } 492 lastsp = 0; 493 break; 494 495 case ' ': 496 if (cp[0] == 'a' && cp[1] == 't' && cp[2] == ' ') 497 cp += 3, *cp2++ = '@'; 498 else 499 if (cp[0] == '@' && cp[1] == ' ') 500 cp += 2, *cp2++ = '@'; 501 else 502 lastsp = 1; 503 break; 504 505 case '<': 506 cp2 = bufend; 507 gotlt++; 508 lastsp = 0; 509 break; 510 511 case '>': 512 if (gotlt) { 513 gotlt = 0; 514 while ((c = *cp) && c != ',') { 515 cp++; 516 if (c == '(') 517 cp = skip_comment(cp); 518 else if (c == '"') 519 while ((c = *cp) != '\0') { 520 cp++; 521 if (c == '"') 522 break; 523 if (c == '\\' && *cp) 524 cp++; 525 } 526 } 527 lastsp = 0; 528 break; 529 } 530 /* FALLTHROUGH */ 531 532 default: 533 if (lastsp) { 534 lastsp = 0; 535 *cp2++ = ' '; 536 } 537 *cp2++ = c; 538 if (c == ',' && !gotlt) { 539 *cp2++ = ' '; 540 for (/*EMPTY*/; *cp == ' '; cp++) 541 continue; 542 lastsp = 0; 543 bufend = cp2; 544 } 545 } 546 } 547 *cp2 = 0; 548 549 return savestr(nbuf); 550 } 551 552 /* 553 * Fetch the sender's name from the passed message. 554 * Reptype can be 555 * 0 -- get sender's name for display purposes 556 * 1 -- get sender's name for reply 557 * 2 -- get sender's name for Reply 558 */ 559 static char * 560 name1(struct message *mp, int reptype) 561 { 562 char namebuf[LINESIZE]; 563 char linebuf[LINESIZE]; 564 char *cp, *cp2; 565 FILE *ibuf; 566 int firstrun = 1; 567 568 if ((cp = hfield("from", mp)) != NULL) 569 return cp; 570 if (reptype == 0 && (cp = hfield("sender", mp)) != NULL) 571 return cp; 572 ibuf = setinput(mp); 573 namebuf[0] = '\0'; 574 if (readline(ibuf, linebuf, LINESIZE, 0) < 0) 575 return savestr(namebuf); 576 newname: 577 for (cp = linebuf; *cp && *cp != ' '; cp++) 578 continue; 579 cp = skip_WSP(cp); 580 for (cp2 = &namebuf[strlen(namebuf)]; 581 *cp && !is_WSP(*cp) && cp2 < namebuf + LINESIZE - 1; 582 /*EMPTY*/) 583 *cp2++ = *cp++; 584 *cp2 = '\0'; 585 if (readline(ibuf, linebuf, LINESIZE, 0) < 0) 586 return savestr(namebuf); 587 if ((cp = strchr(linebuf, 'F')) == NULL) 588 return savestr(namebuf); 589 if (strncmp(cp, "From", 4) != 0) 590 return savestr(namebuf); 591 while ((cp = strchr(cp, 'r')) != NULL) { 592 if (strncmp(cp, "remote", 6) == 0) { 593 if ((cp = strchr(cp, 'f')) == NULL) 594 break; 595 if (strncmp(cp, "from", 4) != 0) 596 break; 597 if ((cp = strchr(cp, ' ')) == NULL) 598 break; 599 cp++; 600 if (firstrun) { 601 cp2 = namebuf; 602 firstrun = 0; 603 } else 604 cp2 = strrchr(namebuf, '!') + 1; 605 while (*cp && cp2 < namebuf + LINESIZE - 1) 606 *cp2++ = *cp++; 607 if (cp2 < namebuf + LINESIZE - 1) 608 *cp2++ = '!'; 609 *cp2 = '\0'; 610 if (cp2 < namebuf + LINESIZE - 1) 611 goto newname; 612 else 613 break; 614 } 615 cp++; 616 } 617 return savestr(namebuf); 618 } 619 620 /* 621 * Count the occurrences of c in str 622 */ 623 static int 624 charcount(char *str, int c) 625 { 626 char *cp; 627 int i; 628 629 for (i = 0, cp = str; *cp; cp++) 630 if (*cp == c) 631 i++; 632 return i; 633 } 634 635 /* 636 * Get sender's name from this message. If the message has 637 * a bunch of arpanet stuff in it, we may have to skin the name 638 * before returning it. 639 */ 640 PUBLIC char * 641 nameof(struct message *mp, int reptype) 642 { 643 char *cp, *cp2; 644 645 cp = skin(name1(mp, reptype)); 646 if (reptype != 0 || charcount(cp, '!') < 2) 647 return cp; 648 cp2 = strrchr(cp, '!'); 649 cp2--; 650 while (cp2 > cp && *cp2 != '!') 651 cp2--; 652 if (*cp2 == '!') 653 return cp2 + 1; 654 return cp; 655 } 656 657 /* 658 * Copy s1 to s2, return pointer to null in s2. 659 */ 660 PUBLIC char * 661 copy(char *s1, char *s2) 662 { 663 664 while ((*s2++ = *s1++) != '\0') 665 continue; 666 return s2 - 1; 667 } 668 669 /* 670 * The core routine to check the ignore table for a field. 671 * Note: realfield should be lower-cased! 672 */ 673 PUBLIC int 674 member(char *realfield, struct ignoretab *table) 675 { 676 struct ignore *igp; 677 678 for (igp = table->i_head[hash(realfield)]; igp != 0; igp = igp->i_link) 679 if (*igp->i_field == *realfield && 680 equal(igp->i_field, realfield)) 681 return 1; 682 return 0; 683 } 684 685 /* 686 * See if the given header field is supposed to be ignored. 687 */ 688 PUBLIC int 689 isign(const char *field, struct ignoretab ignoretabs[2]) 690 { 691 char realfld[LINESIZE]; 692 693 if (ignoretabs == ignoreall) 694 return 1; 695 /* 696 * Lower-case the string, so that "Status" and "status" 697 * will hash to the same place. 698 */ 699 istrcpy(realfld, field); 700 if (ignoretabs[1].i_count > 0) 701 return !member(realfld, ignoretabs + 1); 702 else 703 return member(realfld, ignoretabs); 704 } 705 706 PUBLIC void 707 add_ignore(const char *name, struct ignoretab *tab) 708 { 709 char field[LINESIZE]; 710 int h; 711 struct ignore *igp; 712 713 istrcpy(field, name); 714 if (member(field, tab)) 715 return; 716 h = hash(field); 717 igp = ecalloc(1, sizeof(struct ignore)); 718 igp->i_field = ecalloc(strlen(field) + 1, sizeof(char)); 719 (void)strcpy(igp->i_field, field); 720 igp->i_link = tab->i_head[h]; 721 tab->i_head[h] = igp; 722 tab->i_count++; 723 } 724 725 /* 726 * Write a file to stdout, skipping comment lines. 727 */ 728 PUBLIC void 729 cathelp(const char *fname) 730 { 731 char *line; 732 FILE *f; 733 size_t len; 734 735 if ((f = Fopen(fname, "r")) == NULL) { 736 warn(fname); 737 return; 738 } 739 while ((line = fgetln(f, &len)) != NULL) { 740 if (*line == '#') 741 continue; 742 if (fwrite(line, 1, len, stdout) != len) 743 break; 744 } 745 (void)Fclose(f); 746 return; 747 } 748