1 #ifndef lint
2 static char sccsid[] = "@(#)mail.local.c	4.34 (Berkeley) 09/20/88";
3 #endif
4 
5 #include <sys/param.h>
6 #include <sys/stat.h>
7 #include <sys/file.h>
8 
9 #include <ctype.h>
10 #include <stdio.h>
11 #include <pwd.h>
12 #include <utmp.h>
13 #include <signal.h>
14 #include <setjmp.h>
15 #include <sysexits.h>
16 
17 #define SENDMAIL	"/usr/lib/sendmail"
18 
19 	/* copylet flags */
20 #define REMOTE		1		/* remote mail, add rmtmsg */
21 #define ORDINARY	2
22 #define ZAP		3		/* zap header and trailing empty line */
23 #define	FORWARD		4
24 
25 #define	LSIZE		256
26 #define	MAXLET		300		/* maximum number of letters */
27 #define	MAILMODE	0600		/* mode of created mail */
28 
29 char	line[LSIZE];
30 char	resp[LSIZE];
31 struct let {
32 	long	adr;
33 	char	change;
34 } let[MAXLET];
35 int	nlet	= 0;
36 char	lfil[50];
37 long	iop, time();
38 char	*getenv();
39 char	*index();
40 char	lettmp[] = "/tmp/maXXXXX";
41 char	maildir[] = "/usr/spool/mail/";
42 char	mailfile[] = "/usr/spool/mail/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
43 char	dead[] = "dead.letter";
44 char	forwmsg[] = " forwarded\n";
45 FILE	*tmpf;
46 FILE	*malf;
47 char	my_name[60];
48 char	*getlogin();
49 int	error;
50 int	changed;
51 int	forward;
52 char	from[] = "From ";
53 long	ftell();
54 int	delex();
55 char	*ctime();
56 int	flgf;
57 int	flgp;
58 int	delflg = 1;
59 int	hseqno;
60 jmp_buf	sjbuf;
61 int	rmail;
62 
63 main(argc, argv)
64 char **argv;
65 {
66 	register int i;
67 	char *name;
68 	struct passwd *pwent;
69 
70 	if (!(name = getlogin()) || !*name || !(pwent = getpwnam(name)) ||
71 	    getuid() != pwent->pw_uid)
72 		pwent = getpwuid(getuid());
73 	strncpy(my_name, pwent ? pwent->pw_name : "???", sizeof(my_name)-1);
74 	if (setjmp(sjbuf))
75 		done();
76 	for (i=SIGHUP; i<=SIGTERM; i++)
77 		setsig(i, delex);
78 	i = mkstemp(lettmp);
79 	tmpf = fdopen(i, "r+w");
80 	if (i < 0 || tmpf == NULL)
81 		panic("mail: %s: cannot open for writing", lettmp);
82 	/*
83 	 * This protects against others reading mail from temp file and
84 	 * if we exit, the file will be deleted already.
85 	 */
86 	unlink(lettmp);
87 	if (argv[0][0] == 'r')
88 		rmail++;
89 	if (argv[0][0] != 'r' &&	/* no favors for rmail*/
90 	   (argc == 1 || argv[1][0] == '-' && !any(argv[1][1], "rhd")))
91 		printmail(argc, argv);
92 	else
93 		bulkmail(argc, argv);
94 	done();
95 }
96 
97 setsig(i, f)
98 int i;
99 int (*f)();
100 {
101 	if (signal(i, SIG_IGN) != SIG_IGN)
102 		signal(i, f);
103 }
104 
105 any(c, str)
106 	register int c;
107 	register char *str;
108 {
109 
110 	while (*str)
111 		if (c == *str++)
112 			return(1);
113 	return(0);
114 }
115 
116 printmail(argc, argv)
117 	char **argv;
118 {
119 	int flg, i, j, print;
120 	char *p, *getarg();
121 	struct stat statb;
122 
123 	setuid(getuid());
124 	cat(mailfile, maildir, my_name);
125 #ifdef notdef
126 	if (stat(mailfile, &statb) >= 0
127 	    && (statb.st_mode & S_IFMT) == S_IFDIR) {
128 		strcat(mailfile, "/");
129 		strcat(mailfile, my_name);
130 	}
131 #endif
132 	for (; argc > 1; argv++, argc--) {
133 		if (argv[1][0] != '-')
134 			break;
135 		switch (argv[1][1]) {
136 
137 		case 'p':
138 			flgp++;
139 			/* fall thru... */
140 		case 'q':
141 			delflg = 0;
142 			break;
143 
144 		case 'f':
145 			if (argc >= 3) {
146 				strcpy(mailfile, argv[2]);
147 				argv++, argc--;
148 			}
149 			break;
150 
151 		case 'b':
152 			forward = 1;
153 			break;
154 
155 		default:
156 			panic("unknown option %c", argv[1][1]);
157 			/*NOTREACHED*/
158 		}
159 	}
160 	malf = fopen(mailfile, "r");
161 	if (malf == NULL) {
162 		printf("No mail.\n");
163 		return;
164 	}
165 	flock(fileno(malf), LOCK_SH);
166 	copymt(malf, tmpf);
167 	fclose(malf);			/* implicit unlock */
168 	fseek(tmpf, 0L, L_SET);
169 
170 	changed = 0;
171 	print = 1;
172 	for (i = 0; i < nlet; ) {
173 		j = forward ? i : nlet - i - 1;
174 		if (setjmp(sjbuf)) {
175 			print = 0;
176 		} else {
177 			if (print)
178 				copylet(j, stdout, ORDINARY);
179 			print = 1;
180 		}
181 		if (flgp) {
182 			i++;
183 			continue;
184 		}
185 		setjmp(sjbuf);
186 		fputs("? ", stdout);
187 		fflush(stdout);
188 		if (fgets(resp, LSIZE, stdin) == NULL)
189 			break;
190 		switch (resp[0]) {
191 
192 		default:
193 			printf("usage\n");
194 		case '?':
195 			print = 0;
196 			printf("q\tquit\n");
197 			printf("x\texit without changing mail\n");
198 			printf("p\tprint\n");
199 			printf("s[file]\tsave (default mbox)\n");
200 			printf("w[file]\tsame without header\n");
201 			printf("-\tprint previous\n");
202 			printf("d\tdelete\n");
203 			printf("+\tnext (no delete)\n");
204 			printf("m user\tmail to user\n");
205 			printf("! cmd\texecute cmd\n");
206 			break;
207 
208 		case '+':
209 		case 'n':
210 		case '\n':
211 			i++;
212 			break;
213 		case 'x':
214 			changed = 0;
215 		case 'q':
216 			goto donep;
217 		case 'p':
218 			break;
219 		case '^':
220 		case '-':
221 			if (--i < 0)
222 				i = 0;
223 			break;
224 		case 'y':
225 		case 'w':
226 		case 's':
227 			flg = 0;
228 			if (resp[1] != '\n' && resp[1] != ' ') {
229 				printf("illegal\n");
230 				flg++;
231 				print = 0;
232 				continue;
233 			}
234 			if (resp[1] == '\n' || resp[1] == '\0') {
235 				p = getenv("HOME");
236 				if (p != 0)
237 					cat(resp+1, p, "/mbox");
238 				else
239 					cat(resp+1, "", "mbox");
240 			}
241 			for (p = resp+1; (p = getarg(lfil, p)) != NULL; ) {
242 				malf = fopen(lfil, "a");
243 				if (malf == NULL) {
244 					printf("mail: %s: cannot append\n",
245 					    lfil);
246 					flg++;
247 					continue;
248 				}
249 				copylet(j, malf, resp[0]=='w'? ZAP: ORDINARY);
250 				fclose(malf);
251 			}
252 			if (flg)
253 				print = 0;
254 			else {
255 				let[j].change = 'd';
256 				changed++;
257 				i++;
258 			}
259 			break;
260 		case 'm':
261 			flg = 0;
262 			if (resp[1] == '\n' || resp[1] == '\0') {
263 				i++;
264 				continue;
265 			}
266 			if (resp[1] != ' ') {
267 				printf("invalid command\n");
268 				flg++;
269 				print = 0;
270 				continue;
271 			}
272 			for (p = resp+1; (p = getarg(lfil, p)) != NULL; )
273 				if (!sendmail(j, lfil, my_name))
274 					flg++;
275 			if (flg)
276 				print = 0;
277 			else {
278 				let[j].change = 'd';
279 				changed++;
280 				i++;
281 			}
282 			break;
283 		case '!':
284 			system(resp+1);
285 			printf("!\n");
286 			print = 0;
287 			break;
288 		case 'd':
289 			let[j].change = 'd';
290 			changed++;
291 			i++;
292 			if (resp[1] == 'q')
293 				goto donep;
294 			break;
295 		}
296 	}
297    donep:
298 	if (changed)
299 		copyback();
300 }
301 
302 /* copy temp or whatever back to /usr/spool/mail */
303 copyback()
304 {
305 	register int i, c;
306 	long oldmask;
307 	int fd, new = 0;
308 	struct stat stbuf;
309 
310 	oldmask = sigblock(sigmask(SIGINT)|sigmask(SIGHUP)|sigmask(SIGQUIT));
311 	fd = open(mailfile, O_RDWR | O_CREAT, MAILMODE);
312 	if (fd >= 0) {
313 		flock(fd, LOCK_EX);
314 		malf = fdopen(fd, "r+w");
315 	}
316 	if (fd < 0 || malf == NULL)
317 		panic("can't rewrite %s", lfil);
318 	fstat(fd, &stbuf);
319 	if (stbuf.st_size != let[nlet].adr) {	/* new mail has arrived */
320 		fseek(malf, let[nlet].adr, L_SET);
321 		fseek(tmpf, let[nlet].adr, L_SET);
322 		while ((c = getc(malf)) != EOF)
323 			putc(c, tmpf);
324 		let[++nlet].adr = stbuf.st_size;
325 		new = 1;
326 		fseek(malf, 0L, L_SET);
327 	}
328 	ftruncate(fd, 0L);
329 	for (i = 0; i < nlet; i++)
330 		if (let[i].change != 'd')
331 			copylet(i, malf, ORDINARY);
332 	fclose(malf);		/* implict unlock */
333 	if (new)
334 		printf("New mail has arrived.\n");
335 	sigsetmask(oldmask);
336 }
337 
338 /* copy mail (f1) to temp (f2) */
339 copymt(f1, f2)
340 	FILE *f1, *f2;
341 {
342 	long nextadr;
343 
344 	nlet = nextadr = 0;
345 	let[0].adr = 0;
346 	while (fgets(line, LSIZE, f1) != NULL) {
347 		if (isfrom(line))
348 			let[nlet++].adr = nextadr;
349 		nextadr += strlen(line);
350 		fputs(line, f2);
351 	}
352 	let[nlet].adr = nextadr;	/* last plus 1 */
353 }
354 
355 copylet(n, f, type)
356 	FILE *f;
357 {
358 	int ch;
359 	long k;
360 	char hostname[MAXHOSTNAMELEN];
361 
362 	fseek(tmpf, let[n].adr, L_SET);
363 	k = let[n+1].adr - let[n].adr;
364 	while (k-- > 1 && (ch = getc(tmpf)) != '\n')
365 		if (type != ZAP)
366 			putc(ch, f);
367 	switch (type) {
368 
369 	case REMOTE:
370 		gethostname(hostname, sizeof (hostname));
371 		fprintf(f, " remote from %s\n", hostname);
372 		break;
373 
374 	case FORWARD:
375 		fprintf(f, forwmsg);
376 		break;
377 
378 	case ORDINARY:
379 		putc(ch, f);
380 		break;
381 
382 	case ZAP:
383 		break;
384 
385 	default:
386 		panic("Bad letter type %d to copylet.", type);
387 	}
388 	while (k-- > 1) {
389 		ch = getc(tmpf);
390 		putc(ch, f);
391 	}
392 	if (type != ZAP || ch != '\n')
393 		putc(getc(tmpf), f);
394 }
395 
396 isfrom(lp)
397 register char *lp;
398 {
399 	register char *p;
400 
401 	for (p = from; *p; )
402 		if (*lp++ != *p++)
403 			return(0);
404 	return(1);
405 }
406 
407 bulkmail(argc, argv)
408 char **argv;
409 {
410 	char *truename;
411 	int first;
412 	register char *cp;
413 	char *newargv[1000];
414 	register char **ap;
415 	register char **vp;
416 	int dflag;
417 
418 	dflag = 0;
419 	delflg = 0;
420 	if (argc < 1) {
421 		fprintf(stderr, "puke\n");
422 		return;
423 	}
424 	for (vp = argv, ap = newargv + 1; (*ap = *vp++) != 0; ap++)
425 		if (ap[0][0] == '-' && ap[0][1] == 'd')
426 			dflag++;
427 	if (!dflag) {
428 		/* give it to sendmail, rah rah! */
429 		unlink(lettmp);
430 		ap = newargv+1;
431 		if (rmail)
432 			*ap-- = "-s";
433 		*ap = "-sendmail";
434 		setuid(getuid());
435 		execv(SENDMAIL, ap);
436 		perror(SENDMAIL);
437 		exit(EX_UNAVAILABLE);
438 	}
439 
440 	truename = 0;
441 	line[0] = '\0';
442 
443 	/*
444 	 * When we fall out of this, argv[1] should be first name,
445 	 * argc should be number of names + 1.
446 	 */
447 
448 	while (argc > 1 && *argv[1] == '-') {
449 		cp = *++argv;
450 		argc--;
451 		switch (cp[1]) {
452 		case 'r':
453 			if (argc <= 1)
454 				usage();
455 			truename = argv[1];
456 			fgets(line, LSIZE, stdin);
457 			if (strncmp("From", line, 4) == 0)
458 				line[0] = '\0';
459 			argv++;
460 			argc--;
461 			break;
462 
463 		case 'h':
464 			if (argc <= 1)
465 				usage();
466 			hseqno = atoi(argv[1]);
467 			argv++;
468 			argc--;
469 			break;
470 
471 		case 'd':
472 			break;
473 
474 		default:
475 			usage();
476 		}
477 	}
478 	if (argc <= 1)
479 		usage();
480 	if (truename == 0)
481 		truename = my_name;
482 	time(&iop);
483 	fprintf(tmpf, "%s%s %s", from, truename, ctime(&iop));
484 	iop = ftell(tmpf);
485 	flgf = first = 1;
486 	for (;;) {
487 		if (first) {
488 			first = 0;
489 			if (*line == '\0' && fgets(line, LSIZE, stdin) == NULL)
490 				break;
491 		} else {
492 			if (fgets(line, LSIZE, stdin) == NULL)
493 				break;
494 		}
495 		if (*line == '.' && line[1] == '\n' && isatty(fileno(stdin)))
496 			break;
497 		if (isfrom(line))
498 			putc('>', tmpf);
499 		fputs(line, tmpf);
500 		flgf = 0;
501 	}
502 	putc('\n', tmpf);
503 	nlet = 1;
504 	let[0].adr = 0;
505 	let[1].adr = ftell(tmpf);
506 	if (flgf)
507 		return;
508 	while (--argc > 0)
509 		if (!sendmail(0, *++argv, truename))
510 			error++;
511 	if (error && safefile(dead)) {
512 		setuid(getuid());
513 		malf = fopen(dead, "w");
514 		if (malf == NULL) {
515 			printf("mail: cannot open %s\n", dead);
516 			fclose(tmpf);
517 			return;
518 		}
519 		copylet(0, malf, ZAP);
520 		fclose(malf);
521 		printf("Mail saved in %s\n", dead);
522 	}
523 	fclose(tmpf);
524 }
525 
526 sendrmt(n, name)
527 char *name;
528 {
529 	FILE *rmf, *popen();
530 	register char *p;
531 	char rsys[64], cmd[64];
532 	register pid;
533 	int sts;
534 
535 #ifdef notdef
536 	if (any('^', name)) {
537 		while (p = index(name, '^'))
538 			*p = '!';
539 		if (strncmp(name, "researc", 7)) {
540 			strcpy(rsys, "research");
541 			if (*name != '!')
542 				--name;
543 			goto skip;
544 		}
545 	}
546 #endif
547 	for (p=rsys; *name!='!'; *p++ = *name++)
548 		if (*name=='\0')
549 			return(0);	/* local address, no '!' */
550 	*p = '\0';
551 	if (name[1]=='\0') {
552 		printf("null name\n");
553 		return(0);
554 	}
555 skip:
556 	if ((pid = fork()) == -1) {
557 		fprintf(stderr, "mail: can't create proc for remote\n");
558 		return(0);
559 	}
560 	if (pid) {
561 		while (wait(&sts) != pid) {
562 			if (wait(&sts)==-1)
563 				return(0);
564 		}
565 		return(!sts);
566 	}
567 	setuid(getuid());
568 	if (any('!', name+1))
569 		(void)sprintf(cmd, "uux - %s!rmail \\(%s\\)", rsys, name+1);
570 	else
571 		(void)sprintf(cmd, "uux - %s!rmail %s", rsys, name+1);
572 	if ((rmf=popen(cmd, "w")) == NULL)
573 		exit(1);
574 	copylet(n, rmf, REMOTE);
575 	exit(pclose(rmf) != 0);
576 }
577 
578 usage()
579 {
580 
581 	fprintf(stderr, "Usage: mail [ -f ] people . . .\n");
582 	error = EX_USAGE;
583 	done();
584 }
585 
586 #include <sys/socket.h>
587 #include <netinet/in.h>
588 #include <netdb.h>
589 
590 notifybiff(msg)
591 	char *msg;
592 {
593 	static struct sockaddr_in addr;
594 	static int f = -1;
595 
596 	if (addr.sin_family == 0) {
597 		struct hostent *hp = gethostbyname("localhost");
598 		struct servent *sp = getservbyname("biff", "udp");
599 
600 		if (hp && sp) {
601 			addr.sin_family = hp->h_addrtype;
602 			bcopy(hp->h_addr, &addr.sin_addr, hp->h_length);
603 			addr.sin_port = sp->s_port;
604 		}
605 	}
606 	if (addr.sin_family) {
607 		if (f < 0)
608 			f = socket(AF_INET, SOCK_DGRAM, 0);
609 		if (f >= 0)
610 			sendto(f, msg, strlen(msg)+1, 0, &addr, sizeof (addr));
611 	}
612 }
613 
614 sendmail(n, name, fromaddr)
615 	int n;
616 	char *name, *fromaddr;
617 {
618 	char file[256];
619 	int mask, fd;
620 	struct passwd *pw;
621 #ifdef notdef
622 	struct stat statb;
623 #endif
624 	char buf[128];
625 
626 	if (*name=='!')
627 		name++;
628 	if (any('!', name))
629 		return (sendrmt(n, name));
630 	if ((pw = getpwnam(name)) == NULL) {
631 		printf("mail: can't send to %s\n", name);
632 		return(0);
633 	}
634 	cat(file, maildir, name);
635 #ifdef notdef
636 	if (stat(file, &statb) >= 0 && (statb.st_mode & S_IFMT) == S_IFDIR) {
637 		strcat(file, "/");
638 		strcat(file, name);
639 	}
640 #endif
641 	if (!safefile(file))
642 		return(0);
643 	fd = open(file, O_WRONLY | O_CREAT, MAILMODE);
644 	if (fd >= 0) {
645 		flock(fd, LOCK_EX);
646 		malf = fdopen(fd, "a");
647 	}
648 	if (fd < 0 || malf == NULL) {
649 		close(fd);
650 		printf("mail: %s: cannot append\n", file);
651 		return(0);
652 	}
653 	fchown(fd, pw->pw_uid, pw->pw_gid);
654 	(void)sprintf(buf, "%s@%ld\n", name, ftell(malf));
655 	copylet(n, malf, ORDINARY);
656 	fclose(malf);
657 	notifybiff(buf);
658 	return(1);
659 }
660 
661 delex(i)
662 {
663 	if (i != SIGINT) {
664 		setsig(i, SIG_DFL);
665 		sigsetmask(sigblock(0L) &~ sigmask(i));
666 	}
667 	putc('\n', stderr);
668 	if (delflg)
669 		longjmp(sjbuf, 1);
670 	if (error == 0)
671 		error = i;
672 	done();
673 }
674 
675 done()
676 {
677 
678 	unlink(lettmp);
679 	exit(error);
680 }
681 
682 cat(to, from1, from2)
683 	char *to, *from1, *from2;
684 {
685 	register char *cp, *dp;
686 
687 	cp = to;
688 	for (dp = from1; *cp = *dp++; cp++)
689 		;
690 	for (dp = from2; *cp++ = *dp++; )
691 		;
692 }
693 
694 /* copy p... into s, update p */
695 char *
696 getarg(s, p)
697 	register char *s, *p;
698 {
699 	while (*p == ' ' || *p == '\t')
700 		p++;
701 	if (*p == '\n' || *p == '\0')
702 		return(NULL);
703 	while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
704 		*s++ = *p++;
705 	*s = '\0';
706 	return(p);
707 }
708 
709 safefile(f)
710 	char *f;
711 {
712 	struct stat statb;
713 
714 	if (lstat(f, &statb) < 0)
715 		return (1);
716 	if (statb.st_nlink != 1 || (statb.st_mode & S_IFMT) == S_IFLNK) {
717 		fprintf(stderr,
718 		    "mail: %s has more than one link or is a symbolic link\n",
719 		    f);
720 		return (0);
721 	}
722 	return (1);
723 }
724 
725 panic(msg, a1, a2, a3)
726 	char *msg;
727 {
728 
729 	fprintf(stderr, "mail: ");
730 	fprintf(stderr, msg, a1, a2, a3);
731 	fprintf(stderr, "\n");
732 	done();
733 }
734