1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 #ifndef lint 33 #if 0 34 static char sccsid[] = "@(#)collect.c 8.2 (Berkeley) 4/19/94"; 35 #endif 36 #endif /* not lint */ 37 #include <sys/cdefs.h> 38 /* 39 * Mail -- a mail program 40 * 41 * Collect input from standard input, handling 42 * ~ escapes. 43 */ 44 45 #include "rcv.h" 46 #include <fcntl.h> 47 #include "extern.h" 48 49 /* 50 * Read a message from standard input and return a read file to it 51 * or NULL on error. 52 */ 53 54 /* 55 * The following hokiness with global variables is so that on 56 * receipt of an interrupt signal, the partial message can be salted 57 * away on dead.letter. 58 */ 59 60 static sig_t saveint; /* Previous SIGINT value */ 61 static sig_t savehup; /* Previous SIGHUP value */ 62 static sig_t savetstp; /* Previous SIGTSTP value */ 63 static sig_t savettou; /* Previous SIGTTOU value */ 64 static sig_t savettin; /* Previous SIGTTIN value */ 65 static FILE *collf; /* File for saving away */ 66 static int hadintr; /* Have seen one SIGINT so far */ 67 68 static jmp_buf colljmp; /* To get back to work */ 69 static int colljmp_p; /* whether to long jump */ 70 static jmp_buf collabort; /* To end collection with error */ 71 72 FILE * 73 collect(struct header *hp, int printheaders) 74 { 75 FILE *fbuf; 76 int lc, cc, escape, eofcount, fd, c, t; 77 char linebuf[LINESIZE], tempname[PATHSIZE], *cp, getsub; 78 sigset_t nset; 79 int longline, lastlong, rc; /* So we don't make 2 or more lines 80 out of a long input line. */ 81 82 collf = NULL; 83 /* 84 * Start catching signals from here, but we're still die on interrupts 85 * until we're in the main loop. 86 */ 87 (void)sigemptyset(&nset); 88 (void)sigaddset(&nset, SIGINT); 89 (void)sigaddset(&nset, SIGHUP); 90 (void)sigprocmask(SIG_BLOCK, &nset, NULL); 91 if ((saveint = signal(SIGINT, SIG_IGN)) != SIG_IGN) 92 (void)signal(SIGINT, collint); 93 if ((savehup = signal(SIGHUP, SIG_IGN)) != SIG_IGN) 94 (void)signal(SIGHUP, collhup); 95 savetstp = signal(SIGTSTP, collstop); 96 savettou = signal(SIGTTOU, collstop); 97 savettin = signal(SIGTTIN, collstop); 98 if (setjmp(collabort) || setjmp(colljmp)) { 99 (void)rm(tempname); 100 goto err; 101 } 102 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL); 103 104 noreset++; 105 (void)snprintf(tempname, sizeof(tempname), 106 "%s/mail.RsXXXXXXXXXX", tmpdir); 107 if ((fd = mkstemp(tempname)) == -1 || 108 (collf = Fdopen(fd, "w+")) == NULL) { 109 warn("%s", tempname); 110 goto err; 111 } 112 (void)rm(tempname); 113 114 /* 115 * If we are going to prompt for a subject, 116 * refrain from printing a newline after 117 * the headers (since some people mind). 118 */ 119 t = GTO|GSUBJECT|GCC|GNL; 120 getsub = 0; 121 if (hp->h_subject == NULL && value("interactive") != NULL && 122 (value("ask") != NULL || value("asksub") != NULL)) 123 t &= ~GNL, getsub++; 124 if (printheaders) { 125 puthead(hp, stdout, t); 126 (void)fflush(stdout); 127 } 128 if ((cp = value("escape")) != NULL) 129 escape = *cp; 130 else 131 escape = ESCAPE; 132 eofcount = 0; 133 hadintr = 0; 134 longline = 0; 135 136 if (!setjmp(colljmp)) { 137 if (getsub) 138 grabh(hp, GSUBJECT); 139 } else { 140 /* 141 * Come here for printing the after-signal message. 142 * Duplicate messages won't be printed because 143 * the write is aborted if we get a SIGTTOU. 144 */ 145 cont: 146 if (hadintr) { 147 (void)fflush(stdout); 148 fprintf(stderr, 149 "\n(Interrupt -- one more to kill letter)\n"); 150 } else { 151 printf("(continue)\n"); 152 (void)fflush(stdout); 153 } 154 } 155 for (;;) { 156 colljmp_p = 1; 157 c = readline(stdin, linebuf, LINESIZE); 158 colljmp_p = 0; 159 if (c < 0) { 160 if (value("interactive") != NULL && 161 value("ignoreeof") != NULL && ++eofcount < 25) { 162 printf("Use \".\" to terminate letter\n"); 163 continue; 164 } 165 break; 166 } 167 lastlong = longline; 168 longline = c == LINESIZE - 1; 169 eofcount = 0; 170 hadintr = 0; 171 if (linebuf[0] == '.' && linebuf[1] == '\0' && 172 value("interactive") != NULL && !lastlong && 173 (value("dot") != NULL || value("ignoreeof") != NULL)) 174 break; 175 if (linebuf[0] != escape || value("interactive") == NULL || 176 lastlong) { 177 if (putline(collf, linebuf, !longline) < 0) 178 goto err; 179 continue; 180 } 181 c = linebuf[1]; 182 switch (c) { 183 default: 184 /* 185 * On double escape, just send the single one. 186 * Otherwise, it's an error. 187 */ 188 if (c == escape) { 189 if (putline(collf, &linebuf[1], !longline) < 0) 190 goto err; 191 else 192 break; 193 } 194 printf("Unknown tilde escape.\n"); 195 break; 196 case 'C': 197 /* 198 * Dump core. 199 */ 200 core(NULL); 201 break; 202 case '!': 203 /* 204 * Shell escape, send the balance of the 205 * line to sh -c. 206 */ 207 shell(&linebuf[2]); 208 break; 209 case ':': 210 case '_': 211 /* 212 * Escape to command mode, but be nice! 213 */ 214 execute(&linebuf[2], 1); 215 goto cont; 216 case '.': 217 /* 218 * Simulate end of file on input. 219 */ 220 goto out; 221 case 'q': 222 /* 223 * Force a quit of sending mail. 224 * Act like an interrupt happened. 225 */ 226 hadintr++; 227 collint(SIGINT); 228 exit(1); 229 case 'x': 230 /* 231 * Exit, do not save in dead.letter. 232 */ 233 goto err; 234 case 'h': 235 /* 236 * Grab a bunch of headers. 237 */ 238 grabh(hp, GTO|GSUBJECT|GCC|GBCC); 239 goto cont; 240 case 't': 241 /* 242 * Add to the To list. 243 */ 244 hp->h_to = cat(hp->h_to, extract(&linebuf[2], GTO)); 245 break; 246 case 's': 247 /* 248 * Set the Subject line. 249 */ 250 cp = &linebuf[2]; 251 while (isspace((unsigned char)*cp)) 252 cp++; 253 hp->h_subject = savestr(cp); 254 break; 255 case 'R': 256 /* 257 * Set the Reply-To line. 258 */ 259 cp = &linebuf[2]; 260 while (isspace((unsigned char)*cp)) 261 cp++; 262 hp->h_replyto = savestr(cp); 263 break; 264 case 'c': 265 /* 266 * Add to the CC list. 267 */ 268 hp->h_cc = cat(hp->h_cc, extract(&linebuf[2], GCC)); 269 break; 270 case 'b': 271 /* 272 * Add to the BCC list. 273 */ 274 hp->h_bcc = cat(hp->h_bcc, extract(&linebuf[2], GBCC)); 275 break; 276 case 'i': 277 case 'A': 278 case 'a': 279 /* 280 * Insert named variable in message. 281 */ 282 switch(c) { 283 case 'i': 284 cp = &linebuf[2]; 285 while(isspace((unsigned char)*cp)) 286 cp++; 287 break; 288 case 'a': 289 cp = "sign"; 290 break; 291 case 'A': 292 cp = "Sign"; 293 break; 294 default: 295 goto err; 296 } 297 298 if(*cp != '\0' && (cp = value(cp)) != NULL) { 299 printf("%s\n", cp); 300 if(putline(collf, cp, 1) < 0) 301 goto err; 302 } 303 304 break; 305 case 'd': 306 /* 307 * Read in the dead letter file. 308 */ 309 if (strlcpy(linebuf + 2, getdeadletter(), 310 sizeof(linebuf) - 2) 311 >= sizeof(linebuf) - 2) { 312 printf("Line buffer overflow\n"); 313 break; 314 } 315 /* FALLTHROUGH */ 316 case 'r': 317 case '<': 318 /* 319 * Invoke a file: 320 * Search for the file name, 321 * then open it and copy the contents to collf. 322 */ 323 cp = &linebuf[2]; 324 while (isspace((unsigned char)*cp)) 325 cp++; 326 if (*cp == '\0') { 327 printf("Interpolate what file?\n"); 328 break; 329 } 330 cp = expand(cp); 331 if (cp == NULL) 332 break; 333 if (*cp == '!') { 334 /* 335 * Insert stdout of command. 336 */ 337 char *sh; 338 int nullfd, tempfd, rc; 339 char tempname2[PATHSIZE]; 340 341 if ((nullfd = open(_PATH_DEVNULL, O_RDONLY, 0)) 342 == -1) { 343 warn(_PATH_DEVNULL); 344 break; 345 } 346 347 (void)snprintf(tempname2, sizeof(tempname2), 348 "%s/mail.ReXXXXXXXXXX", tmpdir); 349 if ((tempfd = mkstemp(tempname2)) == -1 || 350 (fbuf = Fdopen(tempfd, "w+")) == NULL) { 351 warn("%s", tempname2); 352 break; 353 } 354 (void)unlink(tempname2); 355 356 if ((sh = value("SHELL")) == NULL) 357 sh = _PATH_CSHELL; 358 359 rc = run_command(sh, 0, nullfd, fileno(fbuf), 360 "-c", cp+1, NULL); 361 362 close(nullfd); 363 364 if (rc < 0) { 365 (void)Fclose(fbuf); 366 break; 367 } 368 369 if (fsize(fbuf) == 0) { 370 fprintf(stderr, 371 "No bytes from command \"%s\"\n", 372 cp+1); 373 (void)Fclose(fbuf); 374 break; 375 } 376 377 rewind(fbuf); 378 } else if (isdir(cp)) { 379 printf("%s: Directory\n", cp); 380 break; 381 } else if ((fbuf = Fopen(cp, "r")) == NULL) { 382 warn("%s", cp); 383 break; 384 } 385 printf("\"%s\" ", cp); 386 (void)fflush(stdout); 387 lc = 0; 388 cc = 0; 389 while ((rc = readline(fbuf, linebuf, LINESIZE)) >= 0) { 390 if (rc != LINESIZE - 1) 391 lc++; 392 if ((t = putline(collf, linebuf, 393 rc != LINESIZE - 1)) < 0) { 394 (void)Fclose(fbuf); 395 goto err; 396 } 397 cc += t; 398 } 399 (void)Fclose(fbuf); 400 printf("%d/%d\n", lc, cc); 401 break; 402 case 'w': 403 /* 404 * Write the message on a file. 405 */ 406 cp = &linebuf[2]; 407 while (*cp == ' ' || *cp == '\t') 408 cp++; 409 if (*cp == '\0') { 410 fprintf(stderr, "Write what file!?\n"); 411 break; 412 } 413 if ((cp = expand(cp)) == NULL) 414 break; 415 rewind(collf); 416 exwrite(cp, collf, 1); 417 break; 418 case 'm': 419 case 'M': 420 case 'f': 421 case 'F': 422 /* 423 * Interpolate the named messages, if we 424 * are in receiving mail mode. Does the 425 * standard list processing garbage. 426 * If ~f is given, we don't shift over. 427 */ 428 if (forward(linebuf + 2, collf, tempname, c) < 0) 429 goto err; 430 goto cont; 431 case '?': 432 if ((fbuf = Fopen(_PATH_TILDE, "r")) == NULL) { 433 warn("%s", _PATH_TILDE); 434 break; 435 } 436 while ((t = getc(fbuf)) != EOF) 437 (void)putchar(t); 438 (void)Fclose(fbuf); 439 break; 440 case 'p': 441 /* 442 * Print out the current state of the 443 * message without altering anything. 444 */ 445 rewind(collf); 446 printf("-------\nMessage contains:\n"); 447 puthead(hp, stdout, GTO|GSUBJECT|GCC|GBCC|GNL); 448 while ((t = getc(collf)) != EOF) 449 (void)putchar(t); 450 goto cont; 451 case '|': 452 /* 453 * Pipe message through command. 454 * Collect output as new message. 455 */ 456 rewind(collf); 457 mespipe(collf, &linebuf[2]); 458 goto cont; 459 case 'v': 460 case 'e': 461 /* 462 * Edit the current message. 463 * 'e' means to use EDITOR 464 * 'v' means to use VISUAL 465 */ 466 rewind(collf); 467 mesedit(collf, c); 468 goto cont; 469 } 470 } 471 goto out; 472 err: 473 if (collf != NULL) { 474 (void)Fclose(collf); 475 collf = NULL; 476 } 477 out: 478 if (collf != NULL) 479 rewind(collf); 480 noreset--; 481 (void)sigprocmask(SIG_BLOCK, &nset, NULL); 482 (void)signal(SIGINT, saveint); 483 (void)signal(SIGHUP, savehup); 484 (void)signal(SIGTSTP, savetstp); 485 (void)signal(SIGTTOU, savettou); 486 (void)signal(SIGTTIN, savettin); 487 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL); 488 return (collf); 489 } 490 491 /* 492 * Write a file, ex-like if f set. 493 */ 494 int 495 exwrite(char name[], FILE *fp, int f) 496 { 497 FILE *of; 498 int c, lc; 499 long cc; 500 struct stat junk; 501 502 if (f) { 503 printf("\"%s\" ", name); 504 (void)fflush(stdout); 505 } 506 if (stat(name, &junk) >= 0 && S_ISREG(junk.st_mode)) { 507 if (!f) 508 fprintf(stderr, "%s: ", name); 509 fprintf(stderr, "File exists\n"); 510 return (-1); 511 } 512 if ((of = Fopen(name, "w")) == NULL) { 513 warn((char *)NULL); 514 return (-1); 515 } 516 lc = 0; 517 cc = 0; 518 while ((c = getc(fp)) != EOF) { 519 cc++; 520 if (c == '\n') 521 lc++; 522 (void)putc(c, of); 523 if (ferror(of)) { 524 warnx("%s", name); 525 (void)Fclose(of); 526 return (-1); 527 } 528 } 529 (void)Fclose(of); 530 printf("%d/%ld\n", lc, cc); 531 (void)fflush(stdout); 532 return (0); 533 } 534 535 /* 536 * Edit the message being collected on fp. 537 * On return, make the edit file the new temp file. 538 */ 539 void 540 mesedit(FILE *fp, int c) 541 { 542 sig_t sigint = signal(SIGINT, SIG_IGN); 543 FILE *nf = run_editor(fp, (off_t)-1, c, 0); 544 545 if (nf != NULL) { 546 (void)fseeko(nf, (off_t)0, SEEK_END); 547 collf = nf; 548 (void)Fclose(fp); 549 } 550 (void)signal(SIGINT, sigint); 551 } 552 553 /* 554 * Pipe the message through the command. 555 * Old message is on stdin of command; 556 * New message collected from stdout. 557 * Sh -c must return 0 to accept the new message. 558 */ 559 void 560 mespipe(FILE *fp, char cmd[]) 561 { 562 FILE *nf; 563 int fd; 564 sig_t sigint = signal(SIGINT, SIG_IGN); 565 char *sh, tempname[PATHSIZE]; 566 567 (void)snprintf(tempname, sizeof(tempname), 568 "%s/mail.ReXXXXXXXXXX", tmpdir); 569 if ((fd = mkstemp(tempname)) == -1 || 570 (nf = Fdopen(fd, "w+")) == NULL) { 571 warn("%s", tempname); 572 goto out; 573 } 574 (void)rm(tempname); 575 /* 576 * stdin = current message. 577 * stdout = new message. 578 */ 579 if ((sh = value("SHELL")) == NULL) 580 sh = _PATH_CSHELL; 581 if (run_command(sh, 582 0, fileno(fp), fileno(nf), "-c", cmd, NULL) < 0) { 583 (void)Fclose(nf); 584 goto out; 585 } 586 if (fsize(nf) == 0) { 587 fprintf(stderr, "No bytes from \"%s\" !?\n", cmd); 588 (void)Fclose(nf); 589 goto out; 590 } 591 /* 592 * Take new files. 593 */ 594 (void)fseeko(nf, (off_t)0, SEEK_END); 595 collf = nf; 596 (void)Fclose(fp); 597 out: 598 (void)signal(SIGINT, sigint); 599 } 600 601 /* 602 * Interpolate the named messages into the current 603 * message, preceding each line with a tab. 604 * Return a count of the number of characters now in 605 * the message, or -1 if an error is encountered writing 606 * the message temporary. The flag argument is 'm' if we 607 * should shift over and 'f' if not. 608 */ 609 int 610 forward(char ms[], FILE *fp, char *fn, int f) 611 { 612 int *msgvec; 613 struct ignoretab *ig; 614 char *tabst; 615 616 msgvec = (int *)salloc((msgCount+1) * sizeof(*msgvec)); 617 if (msgvec == NULL) 618 return (0); 619 if (getmsglist(ms, msgvec, 0) < 0) 620 return (0); 621 if (*msgvec == 0) { 622 *msgvec = first(0, MMNORM); 623 if (*msgvec == 0) { 624 printf("No appropriate messages\n"); 625 return (0); 626 } 627 msgvec[1] = 0; 628 } 629 if (f == 'f' || f == 'F') 630 tabst = NULL; 631 else if ((tabst = value("indentprefix")) == NULL) 632 tabst = "\t"; 633 ig = isupper((unsigned char)f) ? NULL : ignore; 634 printf("Interpolating:"); 635 for (; *msgvec != 0; msgvec++) { 636 struct message *mp = message + *msgvec - 1; 637 638 touch(mp); 639 printf(" %d", *msgvec); 640 if (sendmessage(mp, fp, ig, tabst) < 0) { 641 warnx("%s", fn); 642 return (-1); 643 } 644 } 645 printf("\n"); 646 return (0); 647 } 648 649 /* 650 * Print (continue) when continued after ^Z. 651 */ 652 /*ARGSUSED*/ 653 void 654 collstop(int s) 655 { 656 sig_t old_action = signal(s, SIG_DFL); 657 sigset_t nset; 658 659 (void)sigemptyset(&nset); 660 (void)sigaddset(&nset, s); 661 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL); 662 (void)kill(0, s); 663 (void)sigprocmask(SIG_BLOCK, &nset, NULL); 664 (void)signal(s, old_action); 665 if (colljmp_p) { 666 colljmp_p = 0; 667 hadintr = 0; 668 longjmp(colljmp, 1); 669 } 670 } 671 672 /* 673 * On interrupt, come here to save the partial message in ~/dead.letter. 674 * Then jump out of the collection loop. 675 */ 676 /*ARGSUSED*/ 677 void 678 collint(int s __unused) 679 { 680 /* 681 * the control flow is subtle, because we can be called from ~q. 682 */ 683 if (!hadintr) { 684 if (value("ignore") != NULL) { 685 printf("@"); 686 (void)fflush(stdout); 687 clearerr(stdin); 688 return; 689 } 690 hadintr = 1; 691 longjmp(colljmp, 1); 692 } 693 rewind(collf); 694 if (value("nosave") == NULL) 695 savedeadletter(collf); 696 longjmp(collabort, 1); 697 } 698 699 /*ARGSUSED*/ 700 void 701 collhup(int s __unused) 702 { 703 rewind(collf); 704 savedeadletter(collf); 705 /* 706 * Let's pretend nobody else wants to clean up, 707 * a true statement at this time. 708 */ 709 exit(1); 710 } 711 712 void 713 savedeadletter(FILE *fp) 714 { 715 FILE *dbuf; 716 int c; 717 char *cp; 718 719 if (fsize(fp) == 0) 720 return; 721 cp = getdeadletter(); 722 c = umask(077); 723 dbuf = Fopen(cp, "a"); 724 (void)umask(c); 725 if (dbuf == NULL) 726 return; 727 while ((c = getc(fp)) != EOF) 728 (void)putc(c, dbuf); 729 (void)Fclose(dbuf); 730 rewind(fp); 731 } 732