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 *
collect(struct header * hp,int printheaders)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();
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
exwrite(char name[],FILE * fp,int f)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
mesedit(FILE * fp,int c)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
mespipe(FILE * fp,char cmd[])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
forward(char ms[],FILE * fp,char * fn,int f)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
collstop(int s)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
collint(int s __unused)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
collhup(int s __unused)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
savedeadletter(FILE * fp)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