summaryrefslogtreecommitdiffstats
path: root/usr.bin/mail/names.c
blob: 976bfa48e798522aab11dbe4f06ea13108232675 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
/*
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)names.c	8.1 (Berkeley) 6/6/93";
#endif
static const char rcsid[] =
  "$FreeBSD$";
#endif /* not lint */

/*
 * Mail -- a mail program
 *
 * Handle name lists.
 */

#include "rcv.h"
#include <fcntl.h>
#include "extern.h"

/*
 * Allocate a single element of a name list,
 * initialize its name field to the passed
 * name and return it.
 */
struct name *
nalloc(str, ntype)
	char str[];
	int ntype;
{
	struct name *np;

	np = (struct name *)salloc(sizeof(*np));
	np->n_flink = NULL;
	np->n_blink = NULL;
	np->n_type = ntype;
	np->n_name = savestr(str);
	return (np);
}

/*
 * Find the tail of a list and return it.
 */
struct name *
tailof(name)
	struct name *name;
{
	struct name *np;

	np = name;
	if (np == NULL)
		return (NULL);
	while (np->n_flink != NULL)
		np = np->n_flink;
	return (np);
}

/*
 * Extract a list of names from a line,
 * and make a list of names from it.
 * Return the list or NULL if none found.
 */
struct name *
extract(line, ntype)
	char line[];
	int ntype;
{
	char *cp, *nbuf;
	struct name *top, *np, *t;

	if (line == NULL || *line == '\0')
		return (NULL);
	if ((nbuf = malloc(strlen(line) + 1)) == NULL)
		err(1, "Out of memory");
	top = NULL;
	np = NULL;
	cp = line;
	while ((cp = yankword(cp, nbuf)) != NULL) {
		t = nalloc(nbuf, ntype);
		if (top == NULL)
			top = t;
		else
			np->n_flink = t;
		t->n_blink = np;
		np = t;
	}
	(void)free(nbuf);
	return (top);
}

/*
 * Turn a list of names into a string of the same names.
 */
char *
detract(np, ntype)
	struct name *np;
	int ntype;
{
	int s, comma;
	char *cp, *top;
	struct name *p;

	comma = ntype & GCOMMA;
	if (np == NULL)
		return (NULL);
	ntype &= ~GCOMMA;
	s = 0;
	if (debug && comma)
		fprintf(stderr, "detract asked to insert commas\n");
	for (p = np; p != NULL; p = p->n_flink) {
		if (ntype && (p->n_type & GMASK) != ntype)
			continue;
		s += strlen(p->n_name) + 1;
		if (comma)
			s++;
	}
	if (s == 0)
		return (NULL);
	s += 2;
	top = salloc(s);
	cp = top;
	for (p = np; p != NULL; p = p->n_flink) {
		if (ntype && (p->n_type & GMASK) != ntype)
			continue;
		cp += strlcpy(cp, p->n_name, strlen(p->n_name) + 1);
		if (comma && p->n_flink != NULL)
			*cp++ = ',';
		*cp++ = ' ';
	}
	*--cp = '\0';
	if (comma && *--cp == ',')
		*cp = '\0';
	return (top);
}

/*
 * Grab a single word (liberal word)
 * Throw away things between ()'s, and take anything between <>.
 */
char *
yankword(ap, wbuf)
	char *ap, wbuf[];
{
	char *cp, *cp2;

	cp = ap;
	for (;;) {
		if (*cp == '\0')
			return (NULL);
		if (*cp == '(') {
			int nesting = 0;

			while (*cp != '\0') {
				switch (*cp++) {
				case '(':
					nesting++;
					break;
				case ')':
					--nesting;
					break;
				}
				if (nesting <= 0)
					break;
			}
		} else if (*cp == ' ' || *cp == '\t' || *cp == ',')
			cp++;
		else
			break;
	}
	if (*cp ==  '<')
		for (cp2 = wbuf; *cp && (*cp2++ = *cp++) != '>';)
			;
	else
		for (cp2 = wbuf; *cp != '\0' && strchr(" \t,(", *cp) == NULL;
		    *cp2++ = *cp++)
			;
	*cp2 = '\0';
	return (cp);
}

/*
 * For each recipient in the passed name list with a /
 * in the name, append the message to the end of the named file
 * and remove him from the recipient list.
 *
 * Recipients whose name begins with | are piped through the given
 * program and removed.
 */
struct name *
outof(names, fo, hp)
	struct name *names;
	FILE *fo;
	struct header *hp;
{
	int c, ispipe;
	struct name *np, *top;
	time_t now;
	char *date, *fname;
	FILE *fout, *fin;

	top = names;
	np = names;
	(void)time(&now);
	date = ctime(&now);
	while (np != NULL) {
		if (!isfileaddr(np->n_name) && np->n_name[0] != '|') {
			np = np->n_flink;
			continue;
		}
		ispipe = np->n_name[0] == '|';
		if (ispipe)
			fname = np->n_name+1;
		else
			fname = expand(np->n_name);

		/*
		 * See if we have copied the complete message out yet.
		 * If not, do so.
		 */

		if (image < 0) {
			int fd;
			char tempname[PATHSIZE];

			(void)snprintf(tempname, sizeof(tempname),
			    "%s/mail.ReXXXXXXXXXX", tmpdir);
			if ((fd = mkstemp(tempname)) == -1 ||
			    (fout = Fdopen(fd, "a")) == NULL) {
				warn("%s", tempname);
				senderr++;
				goto cant;
			}
			image = open(tempname, O_RDWR);
			(void)rm(tempname);
			if (image < 0) {
				warn("%s", tempname);
				senderr++;
				(void)Fclose(fout);
				goto cant;
			}
			(void)fcntl(image, F_SETFD, 1);
			fprintf(fout, "From %s %s", myname, date);
			puthead(hp, fout,
			    GTO|GSUBJECT|GCC|GREPLYTO|GINREPLYTO|GNL);
			while ((c = getc(fo)) != EOF)
				(void)putc(c, fout);
			rewind(fo);
			fprintf(fout, "\n");
			(void)fflush(fout);
			if (ferror(fout)) {
				warn("%s", tempname);
				senderr++;
				(void)Fclose(fout);
				goto cant;
			}
			(void)Fclose(fout);
		}

		/*
		 * Now either copy "image" to the desired file
		 * or give it as the standard input to the desired
		 * program as appropriate.
		 */

		if (ispipe) {
			int pid;
			char *sh;
			sigset_t nset;

			/*
			 * XXX
			 * We can't really reuse the same image file,
			 * because multiple piped recipients will
			 * share the same lseek location and trample
			 * on one another.
			 */
			if ((sh = value("SHELL")) == NULL)
				sh = _PATH_CSHELL;
			(void)sigemptyset(&nset);
			(void)sigaddset(&nset, SIGHUP);
			(void)sigaddset(&nset, SIGINT);
			(void)sigaddset(&nset, SIGQUIT);
			pid = start_command(sh, &nset, image, -1, "-c", fname,
			    NULL);
			if (pid < 0) {
				senderr++;
				goto cant;
			}
			free_child(pid);
		} else {
			int f;
			if ((fout = Fopen(fname, "a")) == NULL) {
				warn("%s", fname);
				senderr++;
				goto cant;
			}
			if ((f = dup(image)) < 0) {
				warn("dup");
				fin = NULL;
			} else
				fin = Fdopen(f, "r");
			if (fin == NULL) {
				fprintf(stderr, "Can't reopen image\n");
				(void)Fclose(fout);
				senderr++;
				goto cant;
			}
			rewind(fin);
			while ((c = getc(fin)) != EOF)
				(void)putc(c, fout);
			if (ferror(fout)) {
				warnx("%s", fname);
				senderr++;
				(void)Fclose(fout);
				(void)Fclose(fin);
				goto cant;
			}
			(void)Fclose(fout);
			(void)Fclose(fin);
		}
cant:
		/*
		 * In days of old we removed the entry from the
		 * the list; now for sake of header expansion
		 * we leave it in and mark it as deleted.
		 */
		np->n_type |= GDEL;
		np = np->n_flink;
	}
	if (image >= 0) {
		(void)close(image);
		image = -1;
	}
	return (top);
}

/*
 * Determine if the passed address is a local "send to file" address.
 * If any of the network metacharacters precedes any slashes, it can't
 * be a filename.  We cheat with .'s to allow path names like ./...
 */
int
isfileaddr(name)
	char *name;
{
	char *cp;

	if (*name == '+')
		return (1);
	for (cp = name; *cp != '\0'; cp++) {
		if (*cp == '!' || *cp == '%' || *cp == '@')
			return (0);
		if (*cp == '/')
			return (1);
	}
	return (0);
}

/*
 * Map all of the aliased users in the invoker's mailrc
 * file and insert them into the list.
 * Changed after all these months of service to recursively
 * expand names (2/14/80).
 */

struct name *
usermap(names)
	struct name *names;
{
	struct name *new, *np, *cp;
	struct grouphead *gh;
	int metoo;

	new = NULL;
	np = names;
	metoo = (value("metoo") != NULL);
	while (np != NULL) {
		if (np->n_name[0] == '\\') {
			cp = np->n_flink;
			new = put(new, np);
			np = cp;
			continue;
		}
		gh = findgroup(np->n_name);
		cp = np->n_flink;
		if (gh != NULL)
			new = gexpand(new, gh, metoo, np->n_type);
		else
			new = put(new, np);
		np = cp;
	}
	return (new);
}

/*
 * Recursively expand a group name.  We limit the expansion to some
 * fixed level to keep things from going haywire.
 * Direct recursion is not expanded for convenience.
 */

struct name *
gexpand(nlist, gh, metoo, ntype)
	struct name *nlist;
	struct grouphead *gh;
	int metoo, ntype;
{
	struct group *gp;
	struct grouphead *ngh;
	struct name *np;
	static int depth;
	char *cp;

	if (depth > MAXEXP) {
		printf("Expanding alias to depth larger than %d\n", MAXEXP);
		return (nlist);
	}
	depth++;
	for (gp = gh->g_list; gp != NULL; gp = gp->ge_link) {
		cp = gp->ge_name;
		if (*cp == '\\')
			goto quote;
		if (strcmp(cp, gh->g_name) == 0)
			goto quote;
		if ((ngh = findgroup(cp)) != NULL) {
			nlist = gexpand(nlist, ngh, metoo, ntype);
			continue;
		}
quote:
		np = nalloc(cp, ntype);
		/*
		 * At this point should allow to expand
		 * to self if only person in group
		 */
		if (gp == gh->g_list && gp->ge_link == NULL)
			goto skip;
		if (!metoo && strcmp(cp, myname) == 0)
			np->n_type |= GDEL;
skip:
		nlist = put(nlist, np);
	}
	depth--;
	return (nlist);
}

/*
 * Concatenate the two passed name lists, return the result.
 */
struct name *
cat(n1, n2)
	struct name *n1, *n2;
{
	struct name *tail;

	if (n1 == NULL)
		return (n2);
	if (n2 == NULL)
		return (n1);
	tail = tailof(n1);
	tail->n_flink = n2;
	n2->n_blink = tail;
	return (n1);
}

/*
 * Unpack the name list onto a vector of strings.
 * Return an error if the name list won't fit.
 */
char **
unpack(np)
	struct name *np;
{
	char **ap, **top;
	struct name *n;
	int t, extra, metoo, verbose;

	n = np;
	if ((t = count(n)) == 0)
		errx(1, "No names to unpack");
	/*
	 * Compute the number of extra arguments we will need.
	 * We need at least two extra -- one for "mail" and one for
	 * the terminating 0 pointer.  Additional spots may be needed
	 * to pass along -f to the host mailer.
	 */
	extra = 2;
	extra++;
	metoo = value("metoo") != NULL;
	if (metoo)
		extra++;
	verbose = value("verbose") != NULL;
	if (verbose)
		extra++;
	top = (char **)salloc((t + extra) * sizeof(*top));
	ap = top;
	*ap++ = "send-mail";
	*ap++ = "-i";
	if (metoo)
		*ap++ = "-m";
	if (verbose)
		*ap++ = "-v";
	for (; n != NULL; n = n->n_flink)
		if ((n->n_type & GDEL) == 0)
			*ap++ = n->n_name;
	*ap = NULL;
	return (top);
}

/*
 * Remove all of the duplicates from the passed name list by
 * insertion sorting them, then checking for dups.
 * Return the head of the new list.
 */
struct name *
elide(names)
	struct name *names;
{
	struct name *np, *t, *new;
	struct name *x;

	if (names == NULL)
		return (NULL);
	new = names;
	np = names;
	np = np->n_flink;
	if (np != NULL)
		np->n_blink = NULL;
	new->n_flink = NULL;
	while (np != NULL) {
		t = new;
		while (strcasecmp(t->n_name, np->n_name) < 0) {
			if (t->n_flink == NULL)
				break;
			t = t->n_flink;
		}

		/*
		 * If we ran out of t's, put the new entry after
		 * the current value of t.
		 */

		if (strcasecmp(t->n_name, np->n_name) < 0) {
			t->n_flink = np;
			np->n_blink = t;
			t = np;
			np = np->n_flink;
			t->n_flink = NULL;
			continue;
		}

		/*
		 * Otherwise, put the new entry in front of the
		 * current t.  If at the front of the list,
		 * the new guy becomes the new head of the list.
		 */

		if (t == new) {
			t = np;
			np = np->n_flink;
			t->n_flink = new;
			new->n_blink = t;
			t->n_blink = NULL;
			new = t;
			continue;
		}

		/*
		 * The normal case -- we are inserting into the
		 * middle of the list.
		 */

		x = np;
		np = np->n_flink;
		x->n_flink = t;
		x->n_blink = t->n_blink;
		t->n_blink->n_flink = x;
		t->n_blink = x;
	}

	/*
	 * Now the list headed up by new is sorted.
	 * Go through it and remove duplicates.
	 */

	np = new;
	while (np != NULL) {
		t = np;
		while (t->n_flink != NULL &&
		    strcasecmp(np->n_name, t->n_flink->n_name) == 0)
			t = t->n_flink;
		if (t == np || t == NULL) {
			np = np->n_flink;
			continue;
		}

		/*
		 * Now t points to the last entry with the same name
		 * as np.  Make np point beyond t.
		 */

		np->n_flink = t->n_flink;
		if (t->n_flink != NULL)
			t->n_flink->n_blink = np;
		np = np->n_flink;
	}
	return (new);
}

/*
 * Put another node onto a list of names and return
 * the list.
 */
struct name *
put(list, node)
	struct name *list, *node;
{
	node->n_flink = list;
	node->n_blink = NULL;
	if (list != NULL)
		list->n_blink = node;
	return (node);
}

/*
 * Determine the number of undeleted elements in
 * a name list and return it.
 */
int
count(np)
	struct name *np;
{
	int c;

	for (c = 0; np != NULL; np = np->n_flink)
		if ((np->n_type & GDEL) == 0)
			c++;
	return (c);
}

/*
 * Delete the given name from a namelist.
 */
struct name *
delname(np, name)
	struct name *np;
	char name[];
{
	struct name *p;

	for (p = np; p != NULL; p = p->n_flink)
		if (strcasecmp(p->n_name, name) == 0) {
			if (p->n_blink == NULL) {
				if (p->n_flink != NULL)
					p->n_flink->n_blink = NULL;
				np = p->n_flink;
				continue;
			}
			if (p->n_flink == NULL) {
				if (p->n_blink != NULL)
					p->n_blink->n_flink = NULL;
				continue;
			}
			p->n_blink->n_flink = p->n_flink;
			p->n_flink->n_blink = p->n_blink;
		}
	return (np);
}

/*
 * Pretty print a name list
 * Uncomment it if you need it.
 */

/*
void
prettyprint(name)
	struct name *name;
{
	struct name *np;

	np = name;
	while (np != NULL) {
		fprintf(stderr, "%s(%d) ", np->n_name, np->n_type);
		np = np->n_flink;
	}
	fprintf(stderr, "\n");
}
*/
OpenPOWER on IntegriCloud