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[] = "@(#)aux.c 8.1 (Berkeley) 6/6/93";
35 #endif
36 #endif /* not lint */
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: stable/12/usr.bin/mail/util.c 326025 2017-11-20 19:49:47Z pfg $");
39
40 #include <sys/time.h>
41
42 #include <fcntl.h>
43
44 #include "rcv.h"
45 #include "extern.h"
46
47 /*
48 * Mail -- a mail program
49 *
50 * Auxiliary functions.
51 */
52
53 static char *save2str(char *, char *);
54
55 /*
56 * Return a pointer to a dynamic copy of the argument.
57 */
58 char *
savestr(char * str)59 savestr(char *str)
60 {
61 char *new;
62 int size = strlen(str) + 1;
63
64 if ((new = salloc(size)) != NULL)
65 bcopy(str, new, size);
66 return (new);
67 }
68
69 /*
70 * Make a copy of new argument incorporating old one.
71 */
72 static char *
save2str(char * str,char * old)73 save2str(char *str, char *old)
74 {
75 char *new;
76 int newsize = strlen(str) + 1;
77 int oldsize = old ? strlen(old) + 1 : 0;
78
79 if ((new = salloc(newsize + oldsize)) != NULL) {
80 if (oldsize) {
81 bcopy(old, new, oldsize);
82 new[oldsize - 1] = ' ';
83 }
84 bcopy(str, new + oldsize, newsize);
85 }
86 return (new);
87 }
88
89 /*
90 * Touch the named message by setting its MTOUCH flag.
91 * Touched messages have the effect of not being sent
92 * back to the system mailbox on exit.
93 */
94 void
touch(struct message * mp)95 touch(struct message *mp)
96 {
97
98 mp->m_flag |= MTOUCH;
99 if ((mp->m_flag & MREAD) == 0)
100 mp->m_flag |= MREAD|MSTATUS;
101 }
102
103 /*
104 * Test to see if the passed file name is a directory.
105 * Return true if it is.
106 */
107 int
isdir(char name[])108 isdir(char name[])
109 {
110 struct stat sbuf;
111
112 if (stat(name, &sbuf) < 0)
113 return (0);
114 return (S_ISDIR(sbuf.st_mode));
115 }
116
117 /*
118 * Count the number of arguments in the given string raw list.
119 */
120 int
argcount(char ** argv)121 argcount(char **argv)
122 {
123 char **ap;
124
125 for (ap = argv; *ap++ != NULL;)
126 ;
127 return (ap - argv - 1);
128 }
129
130 /*
131 * Return the desired header line from the passed message
132 * pointer (or NULL if the desired header field is not available).
133 */
134 char *
hfield(const char * field,struct message * mp)135 hfield(const char *field, struct message *mp)
136 {
137 FILE *ibuf;
138 char linebuf[LINESIZE];
139 int lc;
140 char *hfield;
141 char *colon, *oldhfield = NULL;
142
143 ibuf = setinput(mp);
144 if ((lc = mp->m_lines - 1) < 0)
145 return (NULL);
146 if (readline(ibuf, linebuf, LINESIZE) < 0)
147 return (NULL);
148 while (lc > 0) {
149 if ((lc = gethfield(ibuf, linebuf, lc, &colon)) < 0)
150 return (oldhfield);
151 if ((hfield = ishfield(linebuf, colon, field)) != NULL)
152 oldhfield = save2str(hfield, oldhfield);
153 }
154 return (oldhfield);
155 }
156
157 /*
158 * Return the next header field found in the given message.
159 * Return >= 0 if something found, < 0 elsewise.
160 * "colon" is set to point to the colon in the header.
161 * Must deal with \ continuations & other such fraud.
162 */
163 int
gethfield(FILE * f,char linebuf[],int rem,char ** colon)164 gethfield(FILE *f, char linebuf[], int rem, char **colon)
165 {
166 char line2[LINESIZE];
167 char *cp, *cp2;
168 int c;
169
170 for (;;) {
171 if (--rem < 0)
172 return (-1);
173 if ((c = readline(f, linebuf, LINESIZE)) <= 0)
174 return (-1);
175 for (cp = linebuf; isprint((unsigned char)*cp) && *cp != ' ' && *cp != ':';
176 cp++)
177 ;
178 if (*cp != ':' || cp == linebuf)
179 continue;
180 /*
181 * I guess we got a headline.
182 * Handle wraparounding
183 */
184 *colon = cp;
185 cp = linebuf + c;
186 for (;;) {
187 while (--cp >= linebuf && (*cp == ' ' || *cp == '\t'))
188 ;
189 cp++;
190 if (rem <= 0)
191 break;
192 ungetc(c = getc(f), f);
193 if (c != ' ' && c != '\t')
194 break;
195 if ((c = readline(f, line2, LINESIZE)) < 0)
196 break;
197 rem--;
198 for (cp2 = line2; *cp2 == ' ' || *cp2 == '\t'; cp2++)
199 ;
200 c -= cp2 - line2;
201 if (cp + c >= linebuf + LINESIZE - 2)
202 break;
203 *cp++ = ' ';
204 bcopy(cp2, cp, c);
205 cp += c;
206 }
207 *cp = 0;
208 return (rem);
209 }
210 /* NOTREACHED */
211 }
212
213 /*
214 * Check whether the passed line is a header line of
215 * the desired breed. Return the field body, or 0.
216 */
217
218 char*
ishfield(char * linebuf,char * colon,const char * field)219 ishfield(char *linebuf, char *colon, const char *field)
220 {
221 char *cp = colon;
222
223 *cp = 0;
224 if (strcasecmp(linebuf, field) != 0) {
225 *cp = ':';
226 return (0);
227 }
228 *cp = ':';
229 for (cp++; *cp == ' ' || *cp == '\t'; cp++)
230 ;
231 return (cp);
232 }
233
234 /*
235 * Copy a string and lowercase the result.
236 * dsize: space left in buffer (including space for NULL)
237 */
238 void
istrncpy(char * dest,const char * src,size_t dsize)239 istrncpy(char *dest, const char *src, size_t dsize)
240 {
241
242 strlcpy(dest, src, dsize);
243 for (; *dest; dest++)
244 *dest = tolower((unsigned char)*dest);
245 }
246
247 /*
248 * The following code deals with input stacking to do source
249 * commands. All but the current file pointer are saved on
250 * the stack.
251 */
252
253 static int ssp; /* Top of file stack */
254 struct sstack {
255 FILE *s_file; /* File we were in. */
256 int s_cond; /* Saved state of conditionals */
257 int s_loading; /* Loading .mailrc, etc. */
258 };
259 #define SSTACK_SIZE 64 /* XXX was NOFILE. */
260 static struct sstack sstack[SSTACK_SIZE];
261
262 /*
263 * Pushdown current input file and switch to a new one.
264 * Set the global flag "sourcing" so that others will realize
265 * that they are no longer reading from a tty (in all probability).
266 */
267 int
source(char ** arglist)268 source(char **arglist)
269 {
270 FILE *fi;
271 char *cp;
272
273 if ((cp = expand(*arglist)) == NULL)
274 return (1);
275 if ((fi = Fopen(cp, "r")) == NULL) {
276 warn("%s", cp);
277 return (1);
278 }
279 if (ssp >= SSTACK_SIZE - 1) {
280 printf("Too much \"sourcing\" going on.\n");
281 (void)Fclose(fi);
282 return (1);
283 }
284 sstack[ssp].s_file = input;
285 sstack[ssp].s_cond = cond;
286 sstack[ssp].s_loading = loading;
287 ssp++;
288 loading = 0;
289 cond = CANY;
290 input = fi;
291 sourcing++;
292 return (0);
293 }
294
295 /*
296 * Pop the current input back to the previous level.
297 * Update the "sourcing" flag as appropriate.
298 */
299 int
unstack(void)300 unstack(void)
301 {
302 if (ssp <= 0) {
303 printf("\"Source\" stack over-pop.\n");
304 sourcing = 0;
305 return (1);
306 }
307 (void)Fclose(input);
308 if (cond != CANY)
309 printf("Unmatched \"if\"\n");
310 ssp--;
311 cond = sstack[ssp].s_cond;
312 loading = sstack[ssp].s_loading;
313 input = sstack[ssp].s_file;
314 if (ssp == 0)
315 sourcing = loading;
316 return (0);
317 }
318
319 /*
320 * Touch the indicated file.
321 * This is nifty for the shell.
322 */
323 void
alter(char * name)324 alter(char *name)
325 {
326 struct timespec ts[2];
327
328 (void)clock_gettime(CLOCK_REALTIME, &ts[0]);
329 ts[0].tv_sec++;
330 ts[1].tv_sec = 0;
331 ts[1].tv_nsec = UTIME_OMIT;
332 (void)utimensat(AT_FDCWD, name, ts, 0);
333 }
334
335 /*
336 * Get sender's name from this message. If the message has
337 * a bunch of arpanet stuff in it, we may have to skin the name
338 * before returning it.
339 */
340 char *
nameof(struct message * mp,int reptype)341 nameof(struct message *mp, int reptype)
342 {
343 char *cp, *cp2;
344
345 cp = skin(name1(mp, reptype));
346 if (reptype != 0 || charcount(cp, '!') < 2)
347 return (cp);
348 cp2 = strrchr(cp, '!');
349 cp2--;
350 while (cp2 > cp && *cp2 != '!')
351 cp2--;
352 if (*cp2 == '!')
353 return (cp2 + 1);
354 return (cp);
355 }
356
357 /*
358 * Start of a "comment".
359 * Ignore it.
360 */
361 char *
skip_comment(char * cp)362 skip_comment(char *cp)
363 {
364 int nesting = 1;
365
366 for (; nesting > 0 && *cp; cp++) {
367 switch (*cp) {
368 case '\\':
369 if (cp[1])
370 cp++;
371 break;
372 case '(':
373 nesting++;
374 break;
375 case ')':
376 nesting--;
377 break;
378 }
379 }
380 return (cp);
381 }
382
383 /*
384 * Skin an arpa net address according to the RFC 822 interpretation
385 * of "host-phrase."
386 */
387 char *
skin(char * name)388 skin(char *name)
389 {
390 char *nbuf, *bufend, *cp, *cp2;
391 int c, gotlt, lastsp;
392
393 if (name == NULL)
394 return (NULL);
395 if (strchr(name, '(') == NULL && strchr(name, '<') == NULL
396 && strchr(name, ' ') == NULL)
397 return (name);
398
399 /* We assume that length(input) <= length(output) */
400 if ((nbuf = malloc(strlen(name) + 1)) == NULL)
401 err(1, "Out of memory");
402 gotlt = 0;
403 lastsp = 0;
404 bufend = nbuf;
405 for (cp = name, cp2 = bufend; (c = *cp++) != '\0'; ) {
406 switch (c) {
407 case '(':
408 cp = skip_comment(cp);
409 lastsp = 0;
410 break;
411
412 case '"':
413 /*
414 * Start of a "quoted-string".
415 * Copy it in its entirety.
416 */
417 while ((c = *cp) != '\0') {
418 cp++;
419 if (c == '"')
420 break;
421 if (c != '\\')
422 *cp2++ = c;
423 else if ((c = *cp) != '\0') {
424 *cp2++ = c;
425 cp++;
426 }
427 }
428 lastsp = 0;
429 break;
430
431 case ' ':
432 if (cp[0] == 'a' && cp[1] == 't' && cp[2] == ' ')
433 cp += 3, *cp2++ = '@';
434 else
435 if (cp[0] == '@' && cp[1] == ' ')
436 cp += 2, *cp2++ = '@';
437 else
438 lastsp = 1;
439 break;
440
441 case '<':
442 cp2 = bufend;
443 gotlt++;
444 lastsp = 0;
445 break;
446
447 case '>':
448 if (gotlt) {
449 gotlt = 0;
450 while ((c = *cp) != '\0' && c != ',') {
451 cp++;
452 if (c == '(')
453 cp = skip_comment(cp);
454 else if (c == '"')
455 while ((c = *cp) != '\0') {
456 cp++;
457 if (c == '"')
458 break;
459 if (c == '\\' && *cp != '\0')
460 cp++;
461 }
462 }
463 lastsp = 0;
464 break;
465 }
466 /* FALLTHROUGH */
467
468 default:
469 if (lastsp) {
470 lastsp = 0;
471 *cp2++ = ' ';
472 }
473 *cp2++ = c;
474 if (c == ',' && !gotlt &&
475 (*cp == ' ' || *cp == '"' || *cp == '<')) {
476 *cp2++ = ' ';
477 while (*cp == ' ')
478 cp++;
479 lastsp = 0;
480 bufend = cp2;
481 }
482 }
483 }
484 *cp2 = '\0';
485
486 if ((cp = realloc(nbuf, strlen(nbuf) + 1)) != NULL)
487 nbuf = cp;
488 return (nbuf);
489 }
490
491 /*
492 * Fetch the sender's name from the passed message.
493 * Reptype can be
494 * 0 -- get sender's name for display purposes
495 * 1 -- get sender's name for reply
496 * 2 -- get sender's name for Reply
497 */
498 char *
name1(struct message * mp,int reptype)499 name1(struct message *mp, int reptype)
500 {
501 char namebuf[LINESIZE];
502 char linebuf[LINESIZE];
503 char *cp, *cp2;
504 FILE *ibuf;
505 int first = 1;
506
507 if ((cp = hfield("from", mp)) != NULL)
508 return (cp);
509 if (reptype == 0 && (cp = hfield("sender", mp)) != NULL)
510 return (cp);
511 ibuf = setinput(mp);
512 namebuf[0] = '\0';
513 if (readline(ibuf, linebuf, LINESIZE) < 0)
514 return (savestr(namebuf));
515 newname:
516 for (cp = linebuf; *cp != '\0' && *cp != ' '; cp++)
517 ;
518 for (; *cp == ' ' || *cp == '\t'; cp++)
519 ;
520 for (cp2 = &namebuf[strlen(namebuf)];
521 *cp != '\0' && *cp != ' ' && *cp != '\t' &&
522 cp2 < namebuf + LINESIZE - 1;)
523 *cp2++ = *cp++;
524 *cp2 = '\0';
525 if (readline(ibuf, linebuf, LINESIZE) < 0)
526 return (savestr(namebuf));
527 if ((cp = strchr(linebuf, 'F')) == NULL)
528 return (savestr(namebuf));
529 if (strncmp(cp, "From", 4) != 0)
530 return (savestr(namebuf));
531 while ((cp = strchr(cp, 'r')) != NULL) {
532 if (strncmp(cp, "remote", 6) == 0) {
533 if ((cp = strchr(cp, 'f')) == NULL)
534 break;
535 if (strncmp(cp, "from", 4) != 0)
536 break;
537 if ((cp = strchr(cp, ' ')) == NULL)
538 break;
539 cp++;
540 if (first) {
541 cp2 = namebuf;
542 first = 0;
543 } else
544 cp2 = strrchr(namebuf, '!') + 1;
545 strlcpy(cp2, cp, sizeof(namebuf) - (cp2 - namebuf) - 1);
546 strcat(namebuf, "!");
547 goto newname;
548 }
549 cp++;
550 }
551 return (savestr(namebuf));
552 }
553
554 /*
555 * Count the occurrences of c in str
556 */
557 int
charcount(char * str,int c)558 charcount(char *str, int c)
559 {
560 char *cp;
561 int i;
562
563 for (i = 0, cp = str; *cp != '\0'; cp++)
564 if (*cp == c)
565 i++;
566 return (i);
567 }
568
569 /*
570 * See if the given header field is supposed to be ignored.
571 */
572 int
isign(const char * field,struct ignoretab ignore[2])573 isign(const char *field, struct ignoretab ignore[2])
574 {
575 char realfld[LINESIZE];
576
577 if (ignore == ignoreall)
578 return (1);
579 /*
580 * Lower-case the string, so that "Status" and "status"
581 * will hash to the same place.
582 */
583 istrncpy(realfld, field, sizeof(realfld));
584 if (ignore[1].i_count > 0)
585 return (!member(realfld, ignore + 1));
586 else
587 return (member(realfld, ignore));
588 }
589
590 int
member(char * realfield,struct ignoretab * table)591 member(char *realfield, struct ignoretab *table)
592 {
593 struct ignore *igp;
594
595 for (igp = table->i_head[hash(realfield)]; igp != NULL; igp = igp->i_link)
596 if (*igp->i_field == *realfield &&
597 equal(igp->i_field, realfield))
598 return (1);
599 return (0);
600 }
601