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[] = "@(#)lex.c 8.2 (Berkeley) 4/20/95";
35 #endif
36 #endif /* not lint */
37 #include <sys/cdefs.h>
38 #include "rcv.h"
39 #include <errno.h>
40 #include <fcntl.h>
41 #include "extern.h"
42
43 /*
44 * Mail -- a mail program
45 *
46 * Lexical processing of commands.
47 */
48
49 static const char *prompt = "& ";
50
51 extern const struct cmd cmdtab[];
52 extern const char *version;
53
54 /*
55 * Set up editing on the given file name.
56 * If the first character of name is %, we are considered to be
57 * editing the file, otherwise we are reading our mail which has
58 * signficance for mbox and so forth.
59 *
60 * If the -e option is being passed to mail, this function has a
61 * tri-state return code: -1 on error, 0 on no mail, 1 if there is
62 * mail.
63 */
64 int
setfile(char * name)65 setfile(char *name)
66 {
67 FILE *ibuf;
68 int checkmode, i, fd;
69 struct stat stb;
70 char isedit = *name != '%' || getuserid(myname) != getuid();
71 char *who = name[1] ? name + 1 : myname;
72 char tempname[PATHSIZE];
73 static int shudclob;
74
75 checkmode = value("checkmode") != NULL;
76 if ((name = expand(name)) == NULL)
77 return (-1);
78
79 if ((ibuf = Fopen(name, "r")) == NULL) {
80 if (!isedit && errno == ENOENT)
81 goto nomail;
82 warn("%s", name);
83 return (-1);
84 }
85
86 if (fstat(fileno(ibuf), &stb) < 0) {
87 warn("fstat");
88 (void)Fclose(ibuf);
89 return (-1);
90 }
91
92 if (S_ISDIR(stb.st_mode) || !S_ISREG(stb.st_mode)) {
93 (void)Fclose(ibuf);
94 errno = S_ISDIR(stb.st_mode) ? EISDIR : EINVAL;
95 warn("%s", name);
96 return (-1);
97 }
98
99 /*
100 * Looks like all will be well. We must now relinquish our
101 * hold on the current set of stuff. Must hold signals
102 * while we are reading the new file, else we will ruin
103 * the message[] data structure.
104 */
105
106 holdsigs();
107 if (shudclob)
108 quit();
109
110 /*
111 * Copy the messages into /tmp
112 * and set pointers.
113 */
114
115 readonly = 0;
116 if ((i = open(name, 1)) < 0)
117 readonly++;
118 else
119 (void)close(i);
120 if (shudclob) {
121 (void)fclose(itf);
122 (void)fclose(otf);
123 }
124 shudclob = 1;
125 edit = isedit;
126 strlcpy(prevfile, mailname, sizeof(prevfile));
127 if (name != mailname)
128 strlcpy(mailname, name, sizeof(mailname));
129 mailsize = fsize(ibuf);
130 (void)snprintf(tempname, sizeof(tempname),
131 "%s/mail.RxXXXXXXXXXX", tmpdir);
132 if ((fd = mkstemp(tempname)) == -1 || (otf = fdopen(fd, "w")) == NULL)
133 err(1, "%s", tempname);
134 (void)fcntl(fileno(otf), F_SETFD, 1);
135 if ((itf = fopen(tempname, "r")) == NULL)
136 err(1, "%s", tempname);
137 (void)fcntl(fileno(itf), F_SETFD, 1);
138 (void)rm(tempname);
139 setptr(ibuf, 0);
140 setmsize(msgCount);
141 /*
142 * New mail may have arrived while we were reading
143 * the mail file, so reset mailsize to be where
144 * we really are in the file...
145 */
146 mailsize = ftello(ibuf);
147 (void)Fclose(ibuf);
148 relsesigs();
149 sawcom = 0;
150
151 if ((checkmode || !edit) && msgCount == 0) {
152 nomail:
153 if (!checkmode) {
154 fprintf(stderr, "No mail for %s\n", who);
155 return (-1);
156 } else
157 return (0);
158 }
159 return (checkmode ? 1 : 0);
160 }
161
162 /*
163 * Incorporate any new mail that has arrived since we first
164 * started reading mail.
165 */
166 int
incfile(void)167 incfile(void)
168 {
169 off_t newsize;
170 int omsgCount = msgCount;
171 FILE *ibuf;
172
173 ibuf = Fopen(mailname, "r");
174 if (ibuf == NULL)
175 return (-1);
176 holdsigs();
177 newsize = fsize(ibuf);
178 if (newsize == 0)
179 return (-1); /* mail box is now empty??? */
180 if (newsize < mailsize)
181 return (-1); /* mail box has shrunk??? */
182 if (newsize == mailsize)
183 return (0); /* no new mail */
184 setptr(ibuf, mailsize);
185 setmsize(msgCount);
186 mailsize = ftello(ibuf);
187 (void)Fclose(ibuf);
188 relsesigs();
189 return (msgCount - omsgCount);
190 }
191
192 static int *msgvec;
193 static int reset_on_stop; /* do a reset() if stopped */
194
195 /*
196 * Interpret user commands one by one. If standard input is not a tty,
197 * print no prompt.
198 */
199 void
commands(void)200 commands(void)
201 {
202 int n, eofloop = 0;
203 char linebuf[LINESIZE];
204
205 if (!sourcing) {
206 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
207 (void)signal(SIGINT, intr);
208 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
209 (void)signal(SIGHUP, hangup);
210 (void)signal(SIGTSTP, stop);
211 (void)signal(SIGTTOU, stop);
212 (void)signal(SIGTTIN, stop);
213 }
214 setexit();
215 for (;;) {
216 /*
217 * Print the prompt, if needed. Clear out
218 * string space, and flush the output.
219 */
220 if (!sourcing && value("interactive") != NULL) {
221 if ((value("autoinc") != NULL) && (incfile() > 0))
222 printf("New mail has arrived.\n");
223 reset_on_stop = 1;
224 printf("%s", prompt);
225 }
226 (void)fflush(stdout);
227 sreset();
228 /*
229 * Read a line of commands from the current input
230 * and handle end of file specially.
231 */
232 n = 0;
233 for (;;) {
234 if (readline(input, &linebuf[n], LINESIZE - n) < 0) {
235 if (n == 0)
236 n = -1;
237 break;
238 }
239 if ((n = strlen(linebuf)) == 0)
240 break;
241 n--;
242 if (linebuf[n] != '\\')
243 break;
244 linebuf[n++] = ' ';
245 }
246 reset_on_stop = 0;
247 if (n < 0) {
248 /* eof */
249 if (loading)
250 break;
251 if (sourcing) {
252 unstack();
253 continue;
254 }
255 if (value("interactive") != NULL &&
256 value("ignoreeof") != NULL &&
257 ++eofloop < 25) {
258 printf("Use \"quit\" to quit.\n");
259 continue;
260 }
261 break;
262 }
263 eofloop = 0;
264 if (execute(linebuf, 0))
265 break;
266 }
267 }
268
269 /*
270 * Execute a single command.
271 * Command functions return 0 for success, 1 for error, and -1
272 * for abort. A 1 or -1 aborts a load or source. A -1 aborts
273 * the interactive command loop.
274 * Contxt is non-zero if called while composing mail.
275 */
276 int
execute(char linebuf[],int contxt)277 execute(char linebuf[], int contxt)
278 {
279 char word[LINESIZE];
280 char *arglist[MAXARGC];
281 const struct cmd *com;
282 char *cp, *cp2;
283 int c, muvec[2];
284 int e = 1;
285
286 /*
287 * Strip the white space away from the beginning
288 * of the command, then scan out a word, which
289 * consists of anything except digits and white space.
290 *
291 * Handle ! escapes differently to get the correct
292 * lexical conventions.
293 */
294
295 for (cp = linebuf; isspace((unsigned char)*cp); cp++)
296 ;
297 if (*cp == '!') {
298 if (sourcing) {
299 printf("Can't \"!\" while sourcing\n");
300 goto out;
301 }
302 shell(cp+1);
303 return (0);
304 }
305 cp2 = word;
306 while (*cp != '\0' && strchr(" \t0123456789$^.:/-+*'\"", *cp) == NULL)
307 *cp2++ = *cp++;
308 *cp2 = '\0';
309
310 /*
311 * Look up the command; if not found, bitch.
312 * Normally, a blank command would map to the
313 * first command in the table; while sourcing,
314 * however, we ignore blank lines to eliminate
315 * confusion.
316 */
317
318 if (sourcing && *word == '\0')
319 return (0);
320 com = lex(word);
321 if (com == NULL) {
322 printf("Unknown command: \"%s\"\n", word);
323 goto out;
324 }
325
326 /*
327 * See if we should execute the command -- if a conditional
328 * we always execute it, otherwise, check the state of cond.
329 */
330
331 if ((com->c_argtype & F) == 0)
332 if ((cond == CRCV && !rcvmode) || (cond == CSEND && rcvmode))
333 return (0);
334
335 /*
336 * Process the arguments to the command, depending
337 * on the type he expects. Default to an error.
338 * If we are sourcing an interactive command, it's
339 * an error.
340 */
341
342 if (!rcvmode && (com->c_argtype & M) == 0) {
343 printf("May not execute \"%s\" while sending\n",
344 com->c_name);
345 goto out;
346 }
347 if (sourcing && com->c_argtype & I) {
348 printf("May not execute \"%s\" while sourcing\n",
349 com->c_name);
350 goto out;
351 }
352 if (readonly && com->c_argtype & W) {
353 printf("May not execute \"%s\" -- message file is read only\n",
354 com->c_name);
355 goto out;
356 }
357 if (contxt && com->c_argtype & R) {
358 printf("Cannot recursively invoke \"%s\"\n", com->c_name);
359 goto out;
360 }
361 switch (com->c_argtype & ~(F|P|I|M|T|W|R)) {
362 case MSGLIST:
363 /*
364 * A message list defaulting to nearest forward
365 * legal message.
366 */
367 if (msgvec == 0) {
368 printf("Illegal use of \"message list\"\n");
369 break;
370 }
371 if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0)
372 break;
373 if (c == 0) {
374 *msgvec = first(com->c_msgflag, com->c_msgmask);
375 msgvec[1] = 0;
376 }
377 if (*msgvec == 0) {
378 printf("No applicable messages\n");
379 break;
380 }
381 e = (*com->c_func)(msgvec);
382 break;
383
384 case NDMLIST:
385 /*
386 * A message list with no defaults, but no error
387 * if none exist.
388 */
389 if (msgvec == 0) {
390 printf("Illegal use of \"message list\"\n");
391 break;
392 }
393 if (getmsglist(cp, msgvec, com->c_msgflag) < 0)
394 break;
395 e = (*com->c_func)(msgvec);
396 break;
397
398 case STRLIST:
399 /*
400 * Just the straight string, with
401 * leading blanks removed.
402 */
403 while (isspace((unsigned char)*cp))
404 cp++;
405 e = (*com->c_func)(cp);
406 break;
407
408 case RAWLIST:
409 /*
410 * A vector of strings, in shell style.
411 */
412 if ((c = getrawlist(cp, arglist,
413 sizeof(arglist) / sizeof(*arglist))) < 0)
414 break;
415 if (c < com->c_minargs) {
416 printf("%s requires at least %d arg(s)\n",
417 com->c_name, com->c_minargs);
418 break;
419 }
420 if (c > com->c_maxargs) {
421 printf("%s takes no more than %d arg(s)\n",
422 com->c_name, com->c_maxargs);
423 break;
424 }
425 e = (*com->c_func)(arglist);
426 break;
427
428 case NOLIST:
429 /*
430 * Just the constant zero, for exiting,
431 * eg.
432 */
433 e = (*com->c_func)(0);
434 break;
435
436 default:
437 errx(1, "Unknown argtype");
438 }
439
440 out:
441 /*
442 * Exit the current source file on
443 * error.
444 */
445 if (e) {
446 if (e < 0)
447 return (1);
448 if (loading)
449 return (1);
450 if (sourcing)
451 unstack();
452 return (0);
453 }
454 if (com == NULL)
455 return (0);
456 if (value("autoprint") != NULL && com->c_argtype & P)
457 if ((dot->m_flag & MDELETED) == 0) {
458 muvec[0] = dot - &message[0] + 1;
459 muvec[1] = 0;
460 type(muvec);
461 }
462 if (!sourcing && (com->c_argtype & T) == 0)
463 sawcom = 1;
464 return (0);
465 }
466
467 /*
468 * Set the size of the message vector used to construct argument
469 * lists to message list functions.
470 */
471 void
setmsize(int sz)472 setmsize(int sz)
473 {
474
475 if (msgvec != NULL)
476 (void)free(msgvec);
477 msgvec = calloc((unsigned)(sz + 1), sizeof(*msgvec));
478 }
479
480 /*
481 * Find the correct command in the command table corresponding
482 * to the passed command "word"
483 */
484
485 const struct cmd *
lex(char word[])486 lex(char word[])
487 {
488 const struct cmd *cp;
489
490 /*
491 * ignore trailing chars after `#'
492 *
493 * lines with beginning `#' are comments
494 * spaces before `#' are ignored in execute()
495 */
496
497 if (*word == '#')
498 *(word+1) = '\0';
499
500
501 for (cp = &cmdtab[0]; cp->c_name != NULL; cp++)
502 if (isprefix(word, cp->c_name))
503 return (cp);
504 return (NULL);
505 }
506
507 /*
508 * Determine if as1 is a valid prefix of as2.
509 * Return true if yep.
510 */
511 int
isprefix(const char * as1,const char * as2)512 isprefix(const char *as1, const char *as2)
513 {
514 const char *s1, *s2;
515
516 s1 = as1;
517 s2 = as2;
518 while (*s1++ == *s2)
519 if (*s2++ == '\0')
520 return (1);
521 return (*--s1 == '\0');
522 }
523
524 /*
525 * The following gets called on receipt of an interrupt. This is
526 * to abort printout of a command, mainly.
527 * Dispatching here when command() is inactive crashes rcv.
528 * Close all open files except 0, 1, 2, and the temporary.
529 * Also, unstack all source files.
530 */
531
532 static int inithdr; /* am printing startup headers */
533
534 void
intr(int s __unused)535 intr(int s __unused)
536 {
537
538 noreset = 0;
539 if (!inithdr)
540 sawcom++;
541 inithdr = 0;
542 while (sourcing)
543 unstack();
544
545 close_all_files();
546
547 if (image >= 0) {
548 (void)close(image);
549 image = -1;
550 }
551 fprintf(stderr, "Interrupt\n");
552 reset(0);
553 }
554
555 /*
556 * When we wake up after ^Z, reprint the prompt.
557 */
558 void
stop(int s)559 stop(int s)
560 {
561 sig_t old_action = signal(s, SIG_DFL);
562 sigset_t nset;
563
564 (void)sigemptyset(&nset);
565 (void)sigaddset(&nset, s);
566 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
567 (void)kill(0, s);
568 (void)sigprocmask(SIG_BLOCK, &nset, NULL);
569 (void)signal(s, old_action);
570 if (reset_on_stop) {
571 reset_on_stop = 0;
572 reset(0);
573 }
574 }
575
576 /*
577 * Branch here on hangup signal and simulate "exit".
578 */
579 void
hangup(int s __unused)580 hangup(int s __unused)
581 {
582
583 /* nothing to do? */
584 exit(1);
585 }
586
587 /*
588 * Announce the presence of the current Mail version,
589 * give the message count, and print a header listing.
590 */
591 void
announce(void)592 announce(void)
593 {
594 int vec[2], mdot;
595
596 mdot = newfileinfo(0);
597 vec[0] = mdot;
598 vec[1] = 0;
599 dot = &message[mdot - 1];
600 if (msgCount > 0 && value("noheader") == NULL) {
601 inithdr++;
602 headers(vec);
603 inithdr = 0;
604 }
605 }
606
607 /*
608 * Announce information about the file we are editing.
609 * Return a likely place to set dot.
610 */
611 int
newfileinfo(int omsgCount)612 newfileinfo(int omsgCount)
613 {
614 struct message *mp;
615 int u, n, mdot, d, s;
616 char fname[PATHSIZE+1], zname[PATHSIZE+1], *ename;
617
618 for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++)
619 if (mp->m_flag & MNEW)
620 break;
621 if (mp >= &message[msgCount])
622 for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++)
623 if ((mp->m_flag & MREAD) == 0)
624 break;
625 if (mp < &message[msgCount])
626 mdot = mp - &message[0] + 1;
627 else
628 mdot = omsgCount + 1;
629 s = d = 0;
630 for (mp = &message[0], n = 0, u = 0; mp < &message[msgCount]; mp++) {
631 if (mp->m_flag & MNEW)
632 n++;
633 if ((mp->m_flag & MREAD) == 0)
634 u++;
635 if (mp->m_flag & MDELETED)
636 d++;
637 if (mp->m_flag & MSAVED)
638 s++;
639 }
640 ename = mailname;
641 if (getfold(fname, sizeof(fname) - 1) >= 0) {
642 strcat(fname, "/");
643 if (strncmp(fname, mailname, strlen(fname)) == 0) {
644 (void)snprintf(zname, sizeof(zname), "+%s",
645 mailname + strlen(fname));
646 ename = zname;
647 }
648 }
649 printf("\"%s\": ", ename);
650 if (msgCount == 1)
651 printf("1 message");
652 else
653 printf("%d messages", msgCount);
654 if (n > 0)
655 printf(" %d new", n);
656 if (u-n > 0)
657 printf(" %d unread", u);
658 if (d > 0)
659 printf(" %d deleted", d);
660 if (s > 0)
661 printf(" %d saved", s);
662 if (readonly)
663 printf(" [Read only]");
664 printf("\n");
665 return (mdot);
666 }
667
668 /*
669 * Print the current version number.
670 */
671
672 int
pversion(void * arg __unused)673 pversion(void *arg __unused)
674 {
675
676 printf("Version %s\n", version);
677 return (0);
678 }
679
680 /*
681 * Load a file of user definitions.
682 */
683 void
load(char * name)684 load(char *name)
685 {
686 FILE *in, *oldin;
687
688 if ((in = Fopen(name, "r")) == NULL)
689 return;
690 oldin = input;
691 input = in;
692 loading = 1;
693 sourcing = 1;
694 commands();
695 loading = 0;
696 sourcing = 0;
697 input = oldin;
698 (void)Fclose(in);
699 }
700