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 __FBSDID("$FreeBSD$");
39
40 /*
41 * Mail -- a mail program
42 *
43 * Collect input from standard input, handling
44 * ~ escapes.
45 */
46
47 #include "rcv.h"
48 #include <fcntl.h>
49 #include "extern.h"
50
51 /*
52 * Read a message from standard input and return a read file to it
53 * or NULL on error.
54 */
55
56 /*
57 * The following hokiness with global variables is so that on
58 * receipt of an interrupt signal, the partial message can be salted
59 * away on dead.letter.
60 */
61
62 static sig_t saveint; /* Previous SIGINT value */
63 static sig_t savehup; /* Previous SIGHUP value */
64 static sig_t savetstp; /* Previous SIGTSTP value */
65 static sig_t savettou; /* Previous SIGTTOU value */
66 static sig_t savettin; /* Previous SIGTTIN value */
67 static FILE *collf; /* File for saving away */
68 static int hadintr; /* Have seen one SIGINT so far */
69
70 static jmp_buf colljmp; /* To get back to work */
71 static int colljmp_p; /* whether to long jump */
72 static jmp_buf collabort; /* To end collection with error */
73
74 FILE *
collect(struct header * hp,int printheaders)75 collect(struct header *hp, int printheaders)
76 {
77 FILE *fbuf;
78 int lc, cc, escape, eofcount, fd, c, t;
79 char linebuf[LINESIZE], tempname[PATHSIZE], *cp, getsub;
80 sigset_t nset;
81 int longline, lastlong, rc; /* So we don't make 2 or more lines
82 out of a long input line. */
83
84 collf = NULL;
85 /*
86 * Start catching signals from here, but we're still die on interrupts
87 * until we're in the main loop.
88 */
89 (void)sigemptyset(&nset);
90 (void)sigaddset(&nset, SIGINT);
91 (void)sigaddset(&nset, SIGHUP);
92 (void)sigprocmask(SIG_BLOCK, &nset, NULL);
93 if ((saveint = signal(SIGINT, SIG_IGN)) != SIG_IGN)
94 (void)signal(SIGINT, collint);
95 if ((savehup = signal(SIGHUP, SIG_IGN)) != SIG_IGN)
96 (void)signal(SIGHUP, collhup);
97 savetstp = signal(SIGTSTP, collstop);
98 savettou = signal(SIGTTOU, collstop);
99 savettin = signal(SIGTTIN, collstop);
100 if (setjmp(collabort) || setjmp(colljmp)) {
101 (void)rm(tempname);
102 goto err;
103 }
104 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
105
106 noreset++;
107 (void)snprintf(tempname, sizeof(tempname),
108 "%s/mail.RsXXXXXXXXXX", tmpdir);
109 if ((fd = mkstemp(tempname)) == -1 ||
110 (collf = Fdopen(fd, "w+")) == NULL) {
111 warn("%s", tempname);
112 goto err;
113 }
114 (void)rm(tempname);
115
116 /*
117 * If we are going to prompt for a subject,
118 * refrain from printing a newline after
119 * the headers (since some people mind).
120 */
121 t = GTO|GSUBJECT|GCC|GNL;
122 getsub = 0;
123 if (hp->h_subject == NULL && value("interactive") != NULL &&
124 (value("ask") != NULL || value("asksub") != NULL))
125 t &= ~GNL, getsub++;
126 if (printheaders) {
127 puthead(hp, stdout, t);
128 (void)fflush(stdout);
129 }
130 if ((cp = value("escape")) != NULL)
131 escape = *cp;
132 else
133 escape = ESCAPE;
134 eofcount = 0;
135 hadintr = 0;
136 longline = 0;
137
138 if (!setjmp(colljmp)) {
139 if (getsub)
140 grabh(hp, GSUBJECT);
141 } else {
142 /*
143 * Come here for printing the after-signal message.
144 * Duplicate messages won't be printed because
145 * the write is aborted if we get a SIGTTOU.
146 */
147 cont:
148 if (hadintr) {
149 (void)fflush(stdout);
150 fprintf(stderr,
151 "\n(Interrupt -- one more to kill letter)\n");
152 } else {
153 printf("(continue)\n");
154 (void)fflush(stdout);
155 }
156 }
157 for (;;) {
158 colljmp_p = 1;
159 c = readline(stdin, linebuf, LINESIZE);
160 colljmp_p = 0;
161 if (c < 0) {
162 if (value("interactive") != NULL &&
163 value("ignoreeof") != NULL && ++eofcount < 25) {
164 printf("Use \".\" to terminate letter\n");
165 continue;
166 }
167 break;
168 }
169 lastlong = longline;
170 longline = c == LINESIZE - 1;
171 eofcount = 0;
172 hadintr = 0;
173 if (linebuf[0] == '.' && linebuf[1] == '\0' &&
174 value("interactive") != NULL && !lastlong &&
175 (value("dot") != NULL || value("ignoreeof") != NULL))
176 break;
177 if (linebuf[0] != escape || value("interactive") == NULL ||
178 lastlong) {
179 if (putline(collf, linebuf, !longline) < 0)
180 goto err;
181 continue;
182 }
183 c = linebuf[1];
184 switch (c) {
185 default:
186 /*
187 * On double escape, just send the single one.
188 * Otherwise, it's an error.
189 */
190 if (c == escape) {
191 if (putline(collf, &linebuf[1], !longline) < 0)
192 goto err;
193 else
194 break;
195 }
196 printf("Unknown tilde escape.\n");
197 break;
198 case 'C':
199 /*
200 * Dump core.
201 */
202 core();
203 break;
204 case '!':
205 /*
206 * Shell escape, send the balance of the
207 * line to sh -c.
208 */
209 shell(&linebuf[2]);
210 break;
211 case ':':
212 case '_':
213 /*
214 * Escape to command mode, but be nice!
215 */
216 execute(&linebuf[2], 1);
217 goto cont;
218 case '.':
219 /*
220 * Simulate end of file on input.
221 */
222 goto out;
223 case 'q':
224 /*
225 * Force a quit of sending mail.
226 * Act like an interrupt happened.
227 */
228 hadintr++;
229 collint(SIGINT);
230 exit(1);
231 case 'x':
232 /*
233 * Exit, do not save in dead.letter.
234 */
235 goto err;
236 case 'h':
237 /*
238 * Grab a bunch of headers.
239 */
240 grabh(hp, GTO|GSUBJECT|GCC|GBCC);
241 goto cont;
242 case 't':
243 /*
244 * Add to the To list.
245 */
246 hp->h_to = cat(hp->h_to, extract(&linebuf[2], GTO));
247 break;
248 case 's':
249 /*
250 * Set the Subject line.
251 */
252 cp = &linebuf[2];
253 while (isspace((unsigned char)*cp))
254 cp++;
255 hp->h_subject = savestr(cp);
256 break;
257 case 'R':
258 /*
259 * Set the Reply-To line.
260 */
261 cp = &linebuf[2];
262 while (isspace((unsigned char)*cp))
263 cp++;
264 hp->h_replyto = savestr(cp);
265 break;
266 case 'c':
267 /*
268 * Add to the CC list.
269 */
270 hp->h_cc = cat(hp->h_cc, extract(&linebuf[2], GCC));
271 break;
272 case 'b':
273 /*
274 * Add to the BCC list.
275 */
276 hp->h_bcc = cat(hp->h_bcc, extract(&linebuf[2], GBCC));
277 break;
278 case 'i':
279 case 'A':
280 case 'a':
281 /*
282 * Insert named variable in message.
283 */
284 switch(c) {
285 case 'i':
286 cp = &linebuf[2];
287 while(isspace((unsigned char)*cp))
288 cp++;
289 break;
290 case 'a':
291 cp = "sign";
292 break;
293 case 'A':
294 cp = "Sign";
295 break;
296 default:
297 goto err;
298 }
299
300 if(*cp != '\0' && (cp = value(cp)) != NULL) {
301 printf("%s\n", cp);
302 if(putline(collf, cp, 1) < 0)
303 goto err;
304 }
305
306 break;
307 case 'd':
308 /*
309 * Read in the dead letter file.
310 */
311 if (strlcpy(linebuf + 2, getdeadletter(),
312 sizeof(linebuf) - 2)
313 >= sizeof(linebuf) - 2) {
314 printf("Line buffer overflow\n");
315 break;
316 }
317 /* FALLTHROUGH */
318 case 'r':
319 case '<':
320 /*
321 * Invoke a file:
322 * Search for the file name,
323 * then open it and copy the contents to collf.
324 */
325 cp = &linebuf[2];
326 while (isspace((unsigned char)*cp))
327 cp++;
328 if (*cp == '\0') {
329 printf("Interpolate what file?\n");
330 break;
331 }
332 cp = expand(cp);
333 if (cp == NULL)
334 break;
335 if (*cp == '!') {
336 /*
337 * Insert stdout of command.
338 */
339 char *sh;
340 int nullfd, tempfd, rc;
341 char tempname2[PATHSIZE];
342
343 if ((nullfd = open(_PATH_DEVNULL, O_RDONLY, 0))
344 == -1) {
345 warn(_PATH_DEVNULL);
346 break;
347 }
348
349 (void)snprintf(tempname2, sizeof(tempname2),
350 "%s/mail.ReXXXXXXXXXX", tmpdir);
351 if ((tempfd = mkstemp(tempname2)) == -1 ||
352 (fbuf = Fdopen(tempfd, "w+")) == NULL) {
353 warn("%s", tempname2);
354 break;
355 }
356 (void)unlink(tempname2);
357
358 if ((sh = value("SHELL")) == NULL)
359 sh = _PATH_CSHELL;
360
361 rc = run_command(sh, 0, nullfd, fileno(fbuf),
362 "-c", cp+1, NULL);
363
364 close(nullfd);
365
366 if (rc < 0) {
367 (void)Fclose(fbuf);
368 break;
369 }
370
371 if (fsize(fbuf) == 0) {
372 fprintf(stderr,
373 "No bytes from command \"%s\"\n",
374 cp+1);
375 (void)Fclose(fbuf);
376 break;
377 }
378
379 rewind(fbuf);
380 } else if (isdir(cp)) {
381 printf("%s: Directory\n", cp);
382 break;
383 } else if ((fbuf = Fopen(cp, "r")) == NULL) {
384 warn("%s", cp);
385 break;
386 }
387 printf("\"%s\" ", cp);
388 (void)fflush(stdout);
389 lc = 0;
390 cc = 0;
391 while ((rc = readline(fbuf, linebuf, LINESIZE)) >= 0) {
392 if (rc != LINESIZE - 1)
393 lc++;
394 if ((t = putline(collf, linebuf,
395 rc != LINESIZE - 1)) < 0) {
396 (void)Fclose(fbuf);
397 goto err;
398 }
399 cc += t;
400 }
401 (void)Fclose(fbuf);
402 printf("%d/%d\n", lc, cc);
403 break;
404 case 'w':
405 /*
406 * Write the message on a file.
407 */
408 cp = &linebuf[2];
409 while (*cp == ' ' || *cp == '\t')
410 cp++;
411 if (*cp == '\0') {
412 fprintf(stderr, "Write what file!?\n");
413 break;
414 }
415 if ((cp = expand(cp)) == NULL)
416 break;
417 rewind(collf);
418 exwrite(cp, collf, 1);
419 break;
420 case 'm':
421 case 'M':
422 case 'f':
423 case 'F':
424 /*
425 * Interpolate the named messages, if we
426 * are in receiving mail mode. Does the
427 * standard list processing garbage.
428 * If ~f is given, we don't shift over.
429 */
430 if (forward(linebuf + 2, collf, tempname, c) < 0)
431 goto err;
432 goto cont;
433 case '?':
434 if ((fbuf = Fopen(_PATH_TILDE, "r")) == NULL) {
435 warn("%s", _PATH_TILDE);
436 break;
437 }
438 while ((t = getc(fbuf)) != EOF)
439 (void)putchar(t);
440 (void)Fclose(fbuf);
441 break;
442 case 'p':
443 /*
444 * Print out the current state of the
445 * message without altering anything.
446 */
447 rewind(collf);
448 printf("-------\nMessage contains:\n");
449 puthead(hp, stdout, GTO|GSUBJECT|GCC|GBCC|GNL);
450 while ((t = getc(collf)) != EOF)
451 (void)putchar(t);
452 goto cont;
453 case '|':
454 /*
455 * Pipe message through command.
456 * Collect output as new message.
457 */
458 rewind(collf);
459 mespipe(collf, &linebuf[2]);
460 goto cont;
461 case 'v':
462 case 'e':
463 /*
464 * Edit the current message.
465 * 'e' means to use EDITOR
466 * 'v' means to use VISUAL
467 */
468 rewind(collf);
469 mesedit(collf, c);
470 goto cont;
471 }
472 }
473 goto out;
474 err:
475 if (collf != NULL) {
476 (void)Fclose(collf);
477 collf = NULL;
478 }
479 out:
480 if (collf != NULL)
481 rewind(collf);
482 noreset--;
483 (void)sigprocmask(SIG_BLOCK, &nset, NULL);
484 (void)signal(SIGINT, saveint);
485 (void)signal(SIGHUP, savehup);
486 (void)signal(SIGTSTP, savetstp);
487 (void)signal(SIGTTOU, savettou);
488 (void)signal(SIGTTIN, savettin);
489 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
490 return (collf);
491 }
492
493 /*
494 * Write a file, ex-like if f set.
495 */
496 int
exwrite(char name[],FILE * fp,int f)497 exwrite(char name[], FILE *fp, int f)
498 {
499 FILE *of;
500 int c, lc;
501 long cc;
502 struct stat junk;
503
504 if (f) {
505 printf("\"%s\" ", name);
506 (void)fflush(stdout);
507 }
508 if (stat(name, &junk) >= 0 && S_ISREG(junk.st_mode)) {
509 if (!f)
510 fprintf(stderr, "%s: ", name);
511 fprintf(stderr, "File exists\n");
512 return (-1);
513 }
514 if ((of = Fopen(name, "w")) == NULL) {
515 warn((char *)NULL);
516 return (-1);
517 }
518 lc = 0;
519 cc = 0;
520 while ((c = getc(fp)) != EOF) {
521 cc++;
522 if (c == '\n')
523 lc++;
524 (void)putc(c, of);
525 if (ferror(of)) {
526 warnx("%s", name);
527 (void)Fclose(of);
528 return (-1);
529 }
530 }
531 (void)Fclose(of);
532 printf("%d/%ld\n", lc, cc);
533 (void)fflush(stdout);
534 return (0);
535 }
536
537 /*
538 * Edit the message being collected on fp.
539 * On return, make the edit file the new temp file.
540 */
541 void
mesedit(FILE * fp,int c)542 mesedit(FILE *fp, int c)
543 {
544 sig_t sigint = signal(SIGINT, SIG_IGN);
545 FILE *nf = run_editor(fp, (off_t)-1, c, 0);
546
547 if (nf != NULL) {
548 (void)fseeko(nf, (off_t)0, SEEK_END);
549 collf = nf;
550 (void)Fclose(fp);
551 }
552 (void)signal(SIGINT, sigint);
553 }
554
555 /*
556 * Pipe the message through the command.
557 * Old message is on stdin of command;
558 * New message collected from stdout.
559 * Sh -c must return 0 to accept the new message.
560 */
561 void
mespipe(FILE * fp,char cmd[])562 mespipe(FILE *fp, char cmd[])
563 {
564 FILE *nf;
565 int fd;
566 sig_t sigint = signal(SIGINT, SIG_IGN);
567 char *sh, tempname[PATHSIZE];
568
569 (void)snprintf(tempname, sizeof(tempname),
570 "%s/mail.ReXXXXXXXXXX", tmpdir);
571 if ((fd = mkstemp(tempname)) == -1 ||
572 (nf = Fdopen(fd, "w+")) == NULL) {
573 warn("%s", tempname);
574 goto out;
575 }
576 (void)rm(tempname);
577 /*
578 * stdin = current message.
579 * stdout = new message.
580 */
581 if ((sh = value("SHELL")) == NULL)
582 sh = _PATH_CSHELL;
583 if (run_command(sh,
584 0, fileno(fp), fileno(nf), "-c", cmd, NULL) < 0) {
585 (void)Fclose(nf);
586 goto out;
587 }
588 if (fsize(nf) == 0) {
589 fprintf(stderr, "No bytes from \"%s\" !?\n", cmd);
590 (void)Fclose(nf);
591 goto out;
592 }
593 /*
594 * Take new files.
595 */
596 (void)fseeko(nf, (off_t)0, SEEK_END);
597 collf = nf;
598 (void)Fclose(fp);
599 out:
600 (void)signal(SIGINT, sigint);
601 }
602
603 /*
604 * Interpolate the named messages into the current
605 * message, preceding each line with a tab.
606 * Return a count of the number of characters now in
607 * the message, or -1 if an error is encountered writing
608 * the message temporary. The flag argument is 'm' if we
609 * should shift over and 'f' if not.
610 */
611 int
forward(char ms[],FILE * fp,char * fn,int f)612 forward(char ms[], FILE *fp, char *fn, int f)
613 {
614 int *msgvec;
615 struct ignoretab *ig;
616 char *tabst;
617
618 msgvec = (int *)salloc((msgCount+1) * sizeof(*msgvec));
619 if (msgvec == NULL)
620 return (0);
621 if (getmsglist(ms, msgvec, 0) < 0)
622 return (0);
623 if (*msgvec == 0) {
624 *msgvec = first(0, MMNORM);
625 if (*msgvec == 0) {
626 printf("No appropriate messages\n");
627 return (0);
628 }
629 msgvec[1] = 0;
630 }
631 if (f == 'f' || f == 'F')
632 tabst = NULL;
633 else if ((tabst = value("indentprefix")) == NULL)
634 tabst = "\t";
635 ig = isupper((unsigned char)f) ? NULL : ignore;
636 printf("Interpolating:");
637 for (; *msgvec != 0; msgvec++) {
638 struct message *mp = message + *msgvec - 1;
639
640 touch(mp);
641 printf(" %d", *msgvec);
642 if (sendmessage(mp, fp, ig, tabst) < 0) {
643 warnx("%s", fn);
644 return (-1);
645 }
646 }
647 printf("\n");
648 return (0);
649 }
650
651 /*
652 * Print (continue) when continued after ^Z.
653 */
654 /*ARGSUSED*/
655 void
collstop(int s)656 collstop(int s)
657 {
658 sig_t old_action = signal(s, SIG_DFL);
659 sigset_t nset;
660
661 (void)sigemptyset(&nset);
662 (void)sigaddset(&nset, s);
663 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
664 (void)kill(0, s);
665 (void)sigprocmask(SIG_BLOCK, &nset, NULL);
666 (void)signal(s, old_action);
667 if (colljmp_p) {
668 colljmp_p = 0;
669 hadintr = 0;
670 longjmp(colljmp, 1);
671 }
672 }
673
674 /*
675 * On interrupt, come here to save the partial message in ~/dead.letter.
676 * Then jump out of the collection loop.
677 */
678 /*ARGSUSED*/
679 void
collint(int s __unused)680 collint(int s __unused)
681 {
682 /*
683 * the control flow is subtle, because we can be called from ~q.
684 */
685 if (!hadintr) {
686 if (value("ignore") != NULL) {
687 printf("@");
688 (void)fflush(stdout);
689 clearerr(stdin);
690 return;
691 }
692 hadintr = 1;
693 longjmp(colljmp, 1);
694 }
695 rewind(collf);
696 if (value("nosave") == NULL)
697 savedeadletter(collf);
698 longjmp(collabort, 1);
699 }
700
701 /*ARGSUSED*/
702 void
collhup(int s __unused)703 collhup(int s __unused)
704 {
705 rewind(collf);
706 savedeadletter(collf);
707 /*
708 * Let's pretend nobody else wants to clean up,
709 * a true statement at this time.
710 */
711 exit(1);
712 }
713
714 void
savedeadletter(FILE * fp)715 savedeadletter(FILE *fp)
716 {
717 FILE *dbuf;
718 int c;
719 char *cp;
720
721 if (fsize(fp) == 0)
722 return;
723 cp = getdeadletter();
724 c = umask(077);
725 dbuf = Fopen(cp, "a");
726 (void)umask(c);
727 if (dbuf == NULL)
728 return;
729 while ((c = getc(fp)) != EOF)
730 (void)putc(c, dbuf);
731 (void)Fclose(dbuf);
732 rewind(fp);
733 }
734