| 1 | /* |
| 2 | * Copyright (c) 1980 Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * %sccs.include.redist.c% |
| 6 | */ |
| 7 | |
| 8 | #ifndef lint |
| 9 | static char sccsid[] = "@(#)aux.c 5.19 (Berkeley) %G%"; |
| 10 | #endif /* not lint */ |
| 11 | |
| 12 | #include "rcv.h" |
| 13 | #include <sys/stat.h> |
| 14 | #include <sys/time.h> |
| 15 | |
| 16 | /* |
| 17 | * Mail -- a mail program |
| 18 | * |
| 19 | * Auxiliary functions. |
| 20 | */ |
| 21 | |
| 22 | /* |
| 23 | * Return a pointer to a dynamic copy of the argument. |
| 24 | */ |
| 25 | char * |
| 26 | savestr(str) |
| 27 | char *str; |
| 28 | { |
| 29 | char *new; |
| 30 | int size = strlen(str) + 1; |
| 31 | |
| 32 | if ((new = salloc(size)) != NOSTR) |
| 33 | bcopy(str, new, size); |
| 34 | return new; |
| 35 | } |
| 36 | |
| 37 | /* |
| 38 | * Announce a fatal error and die. |
| 39 | */ |
| 40 | |
| 41 | /*VARARGS1*/ |
| 42 | panic(fmt, a, b) |
| 43 | char *fmt; |
| 44 | { |
| 45 | fprintf(stderr, "panic: "); |
| 46 | fprintf(stderr, fmt, a, b); |
| 47 | putc('\n', stderr); |
| 48 | exit(1); |
| 49 | } |
| 50 | |
| 51 | /* |
| 52 | * Touch the named message by setting its MTOUCH flag. |
| 53 | * Touched messages have the effect of not being sent |
| 54 | * back to the system mailbox on exit. |
| 55 | */ |
| 56 | touch(mp) |
| 57 | register struct message *mp; |
| 58 | { |
| 59 | |
| 60 | mp->m_flag |= MTOUCH; |
| 61 | if ((mp->m_flag & MREAD) == 0) |
| 62 | mp->m_flag |= MREAD|MSTATUS; |
| 63 | } |
| 64 | |
| 65 | /* |
| 66 | * Test to see if the passed file name is a directory. |
| 67 | * Return true if it is. |
| 68 | */ |
| 69 | isdir(name) |
| 70 | char name[]; |
| 71 | { |
| 72 | struct stat sbuf; |
| 73 | |
| 74 | if (stat(name, &sbuf) < 0) |
| 75 | return(0); |
| 76 | return((sbuf.st_mode & S_IFMT) == S_IFDIR); |
| 77 | } |
| 78 | |
| 79 | /* |
| 80 | * Count the number of arguments in the given string raw list. |
| 81 | */ |
| 82 | argcount(argv) |
| 83 | char **argv; |
| 84 | { |
| 85 | register char **ap; |
| 86 | |
| 87 | for (ap = argv; *ap++ != NOSTR;) |
| 88 | ; |
| 89 | return ap - argv - 1; |
| 90 | } |
| 91 | |
| 92 | /* |
| 93 | * Return the desired header line from the passed message |
| 94 | * pointer (or NOSTR if the desired header field is not available). |
| 95 | */ |
| 96 | char * |
| 97 | hfield(field, mp) |
| 98 | char field[]; |
| 99 | struct message *mp; |
| 100 | { |
| 101 | register FILE *ibuf; |
| 102 | char linebuf[LINESIZE]; |
| 103 | register int lc; |
| 104 | register char *hfield; |
| 105 | char *colon; |
| 106 | |
| 107 | ibuf = setinput(mp); |
| 108 | if ((lc = mp->m_lines - 1) < 0) |
| 109 | return NOSTR; |
| 110 | if (readline(ibuf, linebuf, LINESIZE) < 0) |
| 111 | return NOSTR; |
| 112 | while (lc > 0) { |
| 113 | if ((lc = gethfield(ibuf, linebuf, lc, &colon)) < 0) |
| 114 | return NOSTR; |
| 115 | if (hfield = ishfield(linebuf, colon, field)) |
| 116 | return savestr(hfield); |
| 117 | } |
| 118 | return NOSTR; |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Return the next header field found in the given message. |
| 123 | * Return >= 0 if something found, < 0 elsewise. |
| 124 | * "colon" is set to point to the colon in the header. |
| 125 | * Must deal with \ continuations & other such fraud. |
| 126 | */ |
| 127 | gethfield(f, linebuf, rem, colon) |
| 128 | register FILE *f; |
| 129 | char linebuf[]; |
| 130 | register int rem; |
| 131 | char **colon; |
| 132 | { |
| 133 | char line2[LINESIZE]; |
| 134 | register char *cp, *cp2; |
| 135 | register int c; |
| 136 | |
| 137 | for (;;) { |
| 138 | if (--rem < 0) |
| 139 | return -1; |
| 140 | if ((c = readline(f, linebuf, LINESIZE)) <= 0) |
| 141 | return -1; |
| 142 | for (cp = linebuf; isprint(*cp) && *cp != ' ' && *cp != ':'; |
| 143 | cp++) |
| 144 | ; |
| 145 | if (*cp != ':' || cp == linebuf) |
| 146 | continue; |
| 147 | /* |
| 148 | * I guess we got a headline. |
| 149 | * Handle wraparounding |
| 150 | */ |
| 151 | *colon = cp; |
| 152 | cp = linebuf + c; |
| 153 | for (;;) { |
| 154 | while (--cp >= linebuf && (*cp == ' ' || *cp == '\t')) |
| 155 | ; |
| 156 | cp++; |
| 157 | if (rem <= 0) |
| 158 | break; |
| 159 | ungetc(c = getc(f), f); |
| 160 | if (c != ' ' && c != '\t') |
| 161 | break; |
| 162 | if ((c = readline(f, line2, LINESIZE)) < 0) |
| 163 | break; |
| 164 | rem--; |
| 165 | for (cp2 = line2; *cp2 == ' ' || *cp2 == '\t'; cp2++) |
| 166 | ; |
| 167 | c -= cp2 - line2; |
| 168 | if (cp + c >= linebuf + LINESIZE - 2) |
| 169 | break; |
| 170 | *cp++ = ' '; |
| 171 | bcopy(cp2, cp, c); |
| 172 | cp += c; |
| 173 | } |
| 174 | *cp = 0; |
| 175 | return rem; |
| 176 | } |
| 177 | /* NOTREACHED */ |
| 178 | } |
| 179 | |
| 180 | /* |
| 181 | * Check whether the passed line is a header line of |
| 182 | * the desired breed. Return the field body, or 0. |
| 183 | */ |
| 184 | |
| 185 | char* |
| 186 | ishfield(linebuf, colon, field) |
| 187 | char linebuf[], field[]; |
| 188 | char *colon; |
| 189 | { |
| 190 | register char *cp = colon; |
| 191 | |
| 192 | *cp = 0; |
| 193 | if (strcasecmp(linebuf, field) != 0) { |
| 194 | *cp = ':'; |
| 195 | return 0; |
| 196 | } |
| 197 | *cp = ':'; |
| 198 | for (cp++; *cp == ' ' || *cp == '\t'; cp++) |
| 199 | ; |
| 200 | return cp; |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * Copy a string, lowercasing it as we go. |
| 205 | */ |
| 206 | istrcpy(dest, src) |
| 207 | register char *dest, *src; |
| 208 | { |
| 209 | |
| 210 | do { |
| 211 | if (isupper(*src)) |
| 212 | *dest++ = tolower(*src); |
| 213 | else |
| 214 | *dest++ = *src; |
| 215 | } while (*src++ != 0); |
| 216 | } |
| 217 | |
| 218 | /* |
| 219 | * The following code deals with input stacking to do source |
| 220 | * commands. All but the current file pointer are saved on |
| 221 | * the stack. |
| 222 | */ |
| 223 | |
| 224 | static int ssp; /* Top of file stack */ |
| 225 | struct sstack { |
| 226 | FILE *s_file; /* File we were in. */ |
| 227 | int s_cond; /* Saved state of conditionals */ |
| 228 | int s_loading; /* Loading .mailrc, etc. */ |
| 229 | } sstack[NOFILE]; |
| 230 | |
| 231 | /* |
| 232 | * Pushdown current input file and switch to a new one. |
| 233 | * Set the global flag "sourcing" so that others will realize |
| 234 | * that they are no longer reading from a tty (in all probability). |
| 235 | */ |
| 236 | source(arglist) |
| 237 | char **arglist; |
| 238 | { |
| 239 | FILE *fi; |
| 240 | char *cp; |
| 241 | |
| 242 | if ((cp = expand(*arglist)) == NOSTR) |
| 243 | return(1); |
| 244 | if ((fi = fopen(cp, "r")) == NULL) { |
| 245 | perror(cp); |
| 246 | return(1); |
| 247 | } |
| 248 | if (ssp >= NOFILE - 1) { |
| 249 | printf("Too much \"sourcing\" going on.\n"); |
| 250 | fclose(fi); |
| 251 | return(1); |
| 252 | } |
| 253 | sstack[ssp].s_file = input; |
| 254 | sstack[ssp].s_cond = cond; |
| 255 | sstack[ssp].s_loading = loading; |
| 256 | ssp++; |
| 257 | loading = 0; |
| 258 | cond = CANY; |
| 259 | input = fi; |
| 260 | sourcing++; |
| 261 | return(0); |
| 262 | } |
| 263 | |
| 264 | /* |
| 265 | * Pop the current input back to the previous level. |
| 266 | * Update the "sourcing" flag as appropriate. |
| 267 | */ |
| 268 | unstack() |
| 269 | { |
| 270 | if (ssp <= 0) { |
| 271 | printf("\"Source\" stack over-pop.\n"); |
| 272 | sourcing = 0; |
| 273 | return(1); |
| 274 | } |
| 275 | fclose(input); |
| 276 | if (cond != CANY) |
| 277 | printf("Unmatched \"if\"\n"); |
| 278 | ssp--; |
| 279 | cond = sstack[ssp].s_cond; |
| 280 | loading = sstack[ssp].s_loading; |
| 281 | input = sstack[ssp].s_file; |
| 282 | if (ssp == 0) |
| 283 | sourcing = loading; |
| 284 | return(0); |
| 285 | } |
| 286 | |
| 287 | /* |
| 288 | * Touch the indicated file. |
| 289 | * This is nifty for the shell. |
| 290 | */ |
| 291 | alter(name) |
| 292 | char *name; |
| 293 | { |
| 294 | struct stat sb; |
| 295 | struct timeval tv[2]; |
| 296 | time_t time(); |
| 297 | |
| 298 | if (stat(name, &sb)) |
| 299 | return; |
| 300 | tv[0].tv_sec = time((time_t *)0) + 1; |
| 301 | tv[1].tv_sec = sb.st_mtime; |
| 302 | tv[0].tv_usec = tv[1].tv_usec = 0; |
| 303 | (void)utimes(name, tv); |
| 304 | } |
| 305 | |
| 306 | /* |
| 307 | * Examine the passed line buffer and |
| 308 | * return true if it is all blanks and tabs. |
| 309 | */ |
| 310 | blankline(linebuf) |
| 311 | char linebuf[]; |
| 312 | { |
| 313 | register char *cp; |
| 314 | |
| 315 | for (cp = linebuf; *cp; cp++) |
| 316 | if (*cp != ' ' && *cp != '\t') |
| 317 | return(0); |
| 318 | return(1); |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | * Get sender's name from this message. If the message has |
| 323 | * a bunch of arpanet stuff in it, we may have to skin the name |
| 324 | * before returning it. |
| 325 | */ |
| 326 | char * |
| 327 | nameof(mp, reptype) |
| 328 | register struct message *mp; |
| 329 | { |
| 330 | register char *cp, *cp2; |
| 331 | |
| 332 | cp = skin(name1(mp, reptype)); |
| 333 | if (reptype != 0 || charcount(cp, '!') < 2) |
| 334 | return(cp); |
| 335 | cp2 = rindex(cp, '!'); |
| 336 | cp2--; |
| 337 | while (cp2 > cp && *cp2 != '!') |
| 338 | cp2--; |
| 339 | if (*cp2 == '!') |
| 340 | return(cp2 + 1); |
| 341 | return(cp); |
| 342 | } |
| 343 | |
| 344 | /* |
| 345 | * Start of a "comment". |
| 346 | * Ignore it. |
| 347 | */ |
| 348 | char * |
| 349 | skip_comment(cp) |
| 350 | register char *cp; |
| 351 | { |
| 352 | register nesting = 1; |
| 353 | |
| 354 | for (; nesting > 0 && *cp; cp++) { |
| 355 | switch (*cp) { |
| 356 | case '\\': |
| 357 | if (cp[1]) |
| 358 | cp++; |
| 359 | break; |
| 360 | case '(': |
| 361 | nesting++; |
| 362 | break; |
| 363 | case ')': |
| 364 | nesting--; |
| 365 | break; |
| 366 | } |
| 367 | } |
| 368 | return cp; |
| 369 | } |
| 370 | |
| 371 | /* |
| 372 | * Skin an arpa net address according to the RFC 822 interpretation |
| 373 | * of "host-phrase." |
| 374 | */ |
| 375 | char * |
| 376 | skin(name) |
| 377 | char *name; |
| 378 | { |
| 379 | register int c; |
| 380 | register char *cp, *cp2; |
| 381 | char *bufend; |
| 382 | int gotlt, lastsp; |
| 383 | char nbuf[BUFSIZ]; |
| 384 | |
| 385 | if (name == NOSTR) |
| 386 | return(NOSTR); |
| 387 | if (index(name, '(') == NOSTR && index(name, '<') == NOSTR |
| 388 | && index(name, ' ') == NOSTR) |
| 389 | return(name); |
| 390 | gotlt = 0; |
| 391 | lastsp = 0; |
| 392 | bufend = nbuf; |
| 393 | for (cp = name, cp2 = bufend; c = *cp++; ) { |
| 394 | switch (c) { |
| 395 | case '(': |
| 396 | cp = skip_comment(cp); |
| 397 | lastsp = 0; |
| 398 | break; |
| 399 | |
| 400 | case '"': |
| 401 | /* |
| 402 | * Start of a "quoted-string". |
| 403 | * Copy it in its entirety. |
| 404 | */ |
| 405 | while (c = *cp) { |
| 406 | cp++; |
| 407 | if (c == '"') |
| 408 | break; |
| 409 | if (c != '\\') |
| 410 | *cp2++ = c; |
| 411 | else if (c = *cp) { |
| 412 | *cp2++ = c; |
| 413 | cp++; |
| 414 | } |
| 415 | } |
| 416 | lastsp = 0; |
| 417 | break; |
| 418 | |
| 419 | case ' ': |
| 420 | if (cp[0] == 'a' && cp[1] == 't' && cp[2] == ' ') |
| 421 | cp += 3, *cp2++ = '@'; |
| 422 | else |
| 423 | if (cp[0] == '@' && cp[1] == ' ') |
| 424 | cp += 2, *cp2++ = '@'; |
| 425 | else |
| 426 | lastsp = 1; |
| 427 | break; |
| 428 | |
| 429 | case '<': |
| 430 | cp2 = bufend; |
| 431 | gotlt++; |
| 432 | lastsp = 0; |
| 433 | break; |
| 434 | |
| 435 | case '>': |
| 436 | if (gotlt) { |
| 437 | gotlt = 0; |
| 438 | while ((c = *cp) && c != ',') { |
| 439 | cp++; |
| 440 | if (c == '(') |
| 441 | cp = skip_comment(cp); |
| 442 | else if (c == '"') |
| 443 | while (c = *cp) { |
| 444 | cp++; |
| 445 | if (c == '"') |
| 446 | break; |
| 447 | if (c == '\\' && *cp) |
| 448 | cp++; |
| 449 | } |
| 450 | } |
| 451 | lastsp = 0; |
| 452 | break; |
| 453 | } |
| 454 | /* Fall into . . . */ |
| 455 | |
| 456 | default: |
| 457 | if (lastsp) { |
| 458 | lastsp = 0; |
| 459 | *cp2++ = ' '; |
| 460 | } |
| 461 | *cp2++ = c; |
| 462 | if (c == ',' && !gotlt) { |
| 463 | *cp2++ = ' '; |
| 464 | for (; *cp == ' '; cp++) |
| 465 | ; |
| 466 | lastsp = 0; |
| 467 | bufend = cp2; |
| 468 | } |
| 469 | } |
| 470 | } |
| 471 | *cp2 = 0; |
| 472 | |
| 473 | return(savestr(nbuf)); |
| 474 | } |
| 475 | |
| 476 | /* |
| 477 | * Fetch the sender's name from the passed message. |
| 478 | * Reptype can be |
| 479 | * 0 -- get sender's name for display purposes |
| 480 | * 1 -- get sender's name for reply |
| 481 | * 2 -- get sender's name for Reply |
| 482 | */ |
| 483 | char * |
| 484 | name1(mp, reptype) |
| 485 | register struct message *mp; |
| 486 | { |
| 487 | char namebuf[LINESIZE]; |
| 488 | char linebuf[LINESIZE]; |
| 489 | register char *cp, *cp2; |
| 490 | register FILE *ibuf; |
| 491 | int first = 1; |
| 492 | |
| 493 | if ((cp = hfield("from", mp)) != NOSTR) |
| 494 | return cp; |
| 495 | if (reptype == 0 && (cp = hfield("sender", mp)) != NOSTR) |
| 496 | return cp; |
| 497 | ibuf = setinput(mp); |
| 498 | namebuf[0] = 0; |
| 499 | if (readline(ibuf, linebuf, LINESIZE) < 0) |
| 500 | return(savestr(namebuf)); |
| 501 | newname: |
| 502 | for (cp = linebuf; *cp && *cp != ' '; cp++) |
| 503 | ; |
| 504 | for (; *cp == ' ' || *cp == '\t'; cp++) |
| 505 | ; |
| 506 | for (cp2 = &namebuf[strlen(namebuf)]; |
| 507 | *cp && *cp != ' ' && *cp != '\t' && cp2 < namebuf + LINESIZE - 1;) |
| 508 | *cp2++ = *cp++; |
| 509 | *cp2 = '\0'; |
| 510 | if (readline(ibuf, linebuf, LINESIZE) < 0) |
| 511 | return(savestr(namebuf)); |
| 512 | if ((cp = index(linebuf, 'F')) == NULL) |
| 513 | return(savestr(namebuf)); |
| 514 | if (strncmp(cp, "From", 4) != 0) |
| 515 | return(savestr(namebuf)); |
| 516 | while ((cp = index(cp, 'r')) != NULL) { |
| 517 | if (strncmp(cp, "remote", 6) == 0) { |
| 518 | if ((cp = index(cp, 'f')) == NULL) |
| 519 | break; |
| 520 | if (strncmp(cp, "from", 4) != 0) |
| 521 | break; |
| 522 | if ((cp = index(cp, ' ')) == NULL) |
| 523 | break; |
| 524 | cp++; |
| 525 | if (first) { |
| 526 | strcpy(namebuf, cp); |
| 527 | first = 0; |
| 528 | } else |
| 529 | strcpy(rindex(namebuf, '!')+1, cp); |
| 530 | strcat(namebuf, "!"); |
| 531 | goto newname; |
| 532 | } |
| 533 | cp++; |
| 534 | } |
| 535 | return(savestr(namebuf)); |
| 536 | } |
| 537 | |
| 538 | /* |
| 539 | * Count the occurances of c in str |
| 540 | */ |
| 541 | charcount(str, c) |
| 542 | char *str; |
| 543 | { |
| 544 | register char *cp; |
| 545 | register int i; |
| 546 | |
| 547 | for (i = 0, cp = str; *cp; cp++) |
| 548 | if (*cp == c) |
| 549 | i++; |
| 550 | return(i); |
| 551 | } |
| 552 | |
| 553 | /* |
| 554 | * Are any of the characters in the two strings the same? |
| 555 | */ |
| 556 | anyof(s1, s2) |
| 557 | register char *s1, *s2; |
| 558 | { |
| 559 | |
| 560 | while (*s1) |
| 561 | if (index(s2, *s1++)) |
| 562 | return 1; |
| 563 | return 0; |
| 564 | } |
| 565 | |
| 566 | /* |
| 567 | * Convert c to upper case |
| 568 | */ |
| 569 | raise(c) |
| 570 | register c; |
| 571 | { |
| 572 | |
| 573 | if (islower(c)) |
| 574 | return toupper(c); |
| 575 | return c; |
| 576 | } |
| 577 | |
| 578 | /* |
| 579 | * Copy s1 to s2, return pointer to null in s2. |
| 580 | */ |
| 581 | char * |
| 582 | copy(s1, s2) |
| 583 | register char *s1, *s2; |
| 584 | { |
| 585 | |
| 586 | while (*s2++ = *s1++) |
| 587 | ; |
| 588 | return s2 - 1; |
| 589 | } |
| 590 | |
| 591 | /* |
| 592 | * See if the given header field is supposed to be ignored. |
| 593 | */ |
| 594 | isign(field, ignore) |
| 595 | char *field; |
| 596 | struct ignoretab ignore[2]; |
| 597 | { |
| 598 | char realfld[BUFSIZ]; |
| 599 | |
| 600 | if (ignore == ignoreall) |
| 601 | return 1; |
| 602 | /* |
| 603 | * Lower-case the string, so that "Status" and "status" |
| 604 | * will hash to the same place. |
| 605 | */ |
| 606 | istrcpy(realfld, field); |
| 607 | if (ignore[1].i_count > 0) |
| 608 | return (!member(realfld, ignore + 1)); |
| 609 | else |
| 610 | return (member(realfld, ignore)); |
| 611 | } |
| 612 | |
| 613 | member(realfield, table) |
| 614 | register char *realfield; |
| 615 | struct ignoretab *table; |
| 616 | { |
| 617 | register struct ignore *igp; |
| 618 | |
| 619 | for (igp = table->i_head[hash(realfield)]; igp != 0; igp = igp->i_link) |
| 620 | if (*igp->i_field == *realfield && |
| 621 | equal(igp->i_field, realfield)) |
| 622 | return (1); |
| 623 | return (0); |
| 624 | } |