tip.c revision 29574 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1983, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)tip.c	8.1 (Berkeley) 6/6/93";
43#endif
44static const char rcsid[] =
45	"$Id: tip.c,v 1.6 1997/08/26 10:25:19 eivind Exp $";
46#endif /* not lint */
47
48/*
49	Forward declarations
50*/
51void ttysetup (int speed);
52
53/*
54 * tip - UNIX link to other systems
55 *  tip [-v] [-speed] system-name
56 * or
57 *  cu phone-number [-s speed] [-l line] [-a acu]
58 */
59
60#include <err.h>
61#include <sys/types.h>
62#include <libutil.h>
63#include "tipconf.h"
64#include "tip.h"
65#include "pathnames.h"
66
67/*
68 * Baud rate mapping table
69 */
70#if !HAVE_TERMIOS
71CONST int bauds[] = {
72	0, 50, 75, 110, 134, 150, 200, 300, 600,
73	1200, 1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200, -1
74};
75#endif
76
77#if !HAVE_TERMIOS
78int	disc = OTTYDISC;		/* tip normally runs this way */
79#endif
80
81void	intprompt();
82void	timeout();
83void	cleanup();
84void	tipdone();
85char	*sname();
86char	PNbuf[256];			/* This limits the size of a number */
87
88static void usage __P((void));
89void setparity __P((char *));
90void pwrite __P((int, char *, int));
91char escape __P((void));
92void tipin __P((void));
93int prompt __P((char *, char *, size_t));
94void unraw __P((void));
95void shell_uid __P((void));
96void daemon_uid __P((void));
97void user_uid __P((void));
98int speed __P((int));
99
100void
101main(argc, argv)
102	char *argv[];
103{
104	char *system = NOSTR;
105	register int i;
106	register char *p;
107	char sbuf[12];
108
109	gid = getgid();
110	egid = getegid();
111	uid = getuid();
112	euid = geteuid();
113
114#if INCLUDE_CU_INTERFACE
115	if (equal(sname(argv[0]), "cu")) {
116		cumode = 1;
117		cumain(argc, argv);
118		goto cucommon;
119	}
120#endif /* INCLUDE_CU_INTERFACE */
121
122	if (argc > 4)
123		usage();
124	if (!isatty(0))
125		errx(1, "must be interactive");
126
127	for (; argc > 1; argv++, argc--) {
128		if (argv[1][0] != '-')
129			system = argv[1];
130		else switch (argv[1][1]) {
131
132		case 'v':
133			vflag++;
134			break;
135
136		case '0': case '1': case '2': case '3': case '4':
137		case '5': case '6': case '7': case '8': case '9':
138			BR = atoi(&argv[1][1]);
139			break;
140
141		default:
142			warnx("%s, unknown option", argv[1]);
143			break;
144		}
145	}
146
147	if (system == NOSTR)
148		goto notnumber;
149	if (isalpha(*system))
150		goto notnumber;
151	/*
152	 * System name is really a phone number...
153	 * Copy the number then stomp on the original (in case the number
154	 *	is private, we don't want 'ps' or 'w' to find it).
155	 */
156	if (strlen(system) > sizeof PNbuf - 1)
157		errx(1, "phone number too long (max = %d bytes)", sizeof PNbuf - 1);
158	strncpy( PNbuf, system, sizeof PNbuf - 1 );
159	for (p = system; *p; p++)
160		*p = '\0';
161	PN = PNbuf;
162	(void)sprintf(sbuf, "tip%ld", BR);
163	system = sbuf;
164
165notnumber:
166	(void)signal(SIGINT, cleanup);
167	(void)signal(SIGQUIT, cleanup);
168	(void)signal(SIGHUP, cleanup);
169	(void)signal(SIGTERM, cleanup);
170	(void)signal(SIGUSR1, tipdone);
171
172	if ((i = hunt(system)) == 0) {
173		printf("all ports busy\n");
174		exit(3);
175	}
176	if (i == -1) {
177		printf("link down\n");
178		(void)uu_unlock(uucplock);
179		exit(3);
180	}
181	setbuf(stdout, NULL);
182	loginit();
183
184	/*
185	 * Kludge, their's no easy way to get the initialization
186	 *   in the right order, so force it here
187	 */
188	if ((PH = getenv("PHONES")) == NOSTR)
189		PH = _PATH_PHONES;
190	vinit();				/* init variables */
191	setparity("even");			/* set the parity table */
192	if ((i = speed(number(value(BAUDRATE)))) == 0) {
193		printf("tip: bad baud rate %d\n", number(value(BAUDRATE)));
194		(void)uu_unlock(uucplock);
195		exit(3);
196	}
197
198	/*
199	 * Now that we have the logfile and the ACU open
200	 *  return to the real uid and gid.  These things will
201	 *  be closed on exit.  Swap real and effective uid's
202	 *  so we can get the original permissions back
203	 *  for removing the uucp lock.
204	 */
205	user_uid();
206
207	/*
208	 * Hardwired connections require the
209	 *  line speed set before they make any transmissions
210	 *  (this is particularly true of things like a DF03-AC)
211	 */
212	if (HW)
213		ttysetup(i);
214	if ((p = connect())) {
215		printf("\07%s\n[EOT]\n", p);
216		daemon_uid();
217		(void)uu_unlock(uucplock);
218		exit(1);
219	}
220	if (!HW)
221		ttysetup(i);
222/* cucommon:*/
223	/*
224	 * From here down the code is shared with
225	 * the "cu" version of tip.
226	 */
227
228#if HAVE_TERMIOS
229	tcgetattr (0, &otermios);
230	ctermios = otermios;
231#ifndef _POSIX_SOURCE
232	ctermios.c_iflag = (IMAXBEL|IXANY|ISTRIP|IXON|BRKINT);
233	ctermios.c_lflag = (PENDIN|IEXTEN|ISIG|ECHOCTL|ECHOE|ECHOKE);
234#else
235	ctermios.c_iflag = (ISTRIP|IXON|BRKINT);
236	ctermios.c_lflag = (PENDIN|IEXTEN|ISIG|ECHOE);
237#endif
238	ctermios.c_cflag = (CLOCAL|HUPCL|CREAD|CS8);
239	ctermios.c_cc[VINTR] = 	ctermios.c_cc[VQUIT] = -1;
240	ctermios.c_cc[VSUSP] = ctermios.c_cc[VDSUSP] = ctermios.c_cc[VDISCARD] =
241		ctermios.c_cc[VLNEXT] = -1;
242#else /* HAVE_TERMIOS */
243	ioctl(0, TIOCGETP, (char *)&defarg);
244	ioctl(0, TIOCGETC, (char *)&defchars);
245	ioctl(0, TIOCGLTC, (char *)&deflchars);
246	ioctl(0, TIOCGETD, (char *)&odisc);
247	arg = defarg;
248	arg.sg_flags = ANYP | CBREAK;
249	tchars = defchars;
250	tchars.t_intrc = tchars.t_quitc = -1;
251	ltchars = deflchars;
252	ltchars.t_suspc = ltchars.t_dsuspc = ltchars.t_flushc
253		= ltchars.t_lnextc = -1;
254#endif /* HAVE_TERMIOS */
255	raw();
256
257	pipe(fildes); pipe(repdes);
258	(void)signal(SIGALRM, timeout);
259
260	/*
261	 * Everything's set up now:
262	 *	connection established (hardwired or dialup)
263	 *	line conditioned (baud rate, mode, etc.)
264	 *	internal data structures (variables)
265	 * so, fork one process for local side and one for remote.
266	 */
267	printf(cumode ? "Connected\r\n" : "\07connected\r\n");
268
269	if (LI != NOSTR && tiplink (LI, 0) != 0) {
270		tipabort ("login failed");
271	}
272
273	if ((pid = fork()))
274		tipin();
275	else
276		tipout();
277	/*NOTREACHED*/
278}
279
280static void
281usage()
282{
283	fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n");
284	exit(1);
285}
286
287void
288cleanup()
289{
290
291	daemon_uid();
292	(void)uu_unlock(uucplock);
293#if !HAVE_TERMIOS
294	if (odisc)
295		ioctl(0, TIOCSETD, (char *)&odisc);
296#endif
297	exit(0);
298}
299
300void
301tipdone()
302{
303	tipabort("Hangup.");
304}
305/*
306 * Muck with user ID's.  We are setuid to the owner of the lock
307 * directory when we start.  user_uid() reverses real and effective
308 * ID's after startup, to run with the user's permissions.
309 * daemon_uid() switches back to the privileged uid for unlocking.
310 * Finally, to avoid running a shell with the wrong real uid,
311 * shell_uid() sets real and effective uid's to the user's real ID.
312 */
313static int uidswapped;
314
315void
316user_uid()
317{
318	if (uidswapped == 0) {
319		seteuid(uid);
320		uidswapped = 1;
321	}
322}
323
324void
325daemon_uid()
326{
327	if (uidswapped) {
328		seteuid(euid);
329		uidswapped = 0;
330	}
331}
332
333void
334shell_uid()
335{
336	seteuid(uid);
337}
338
339/*
340 * put the controlling keyboard into raw mode
341 */
342void
343raw ()
344{
345#if HAVE_TERMIOS
346	tcsetattr (0, TCSANOW, &ctermios);
347#else /* HAVE_TERMIOS */
348
349	ioctl(0, TIOCSETP, &arg);
350	ioctl(0, TIOCSETC, &tchars);
351	ioctl(0, TIOCSLTC, &ltchars);
352	ioctl(0, TIOCSETD, (char *)&disc);
353#endif /* HAVE_TERMIOS */
354}
355
356
357/*
358 * return keyboard to normal mode
359 */
360void
361unraw()
362{
363#if HAVE_TERMIOS
364	tcsetattr (0, TCSANOW, &otermios);
365#else /* HAVE_TERMIOS */
366
367	ioctl(0, TIOCSETD, (char *)&odisc);
368	ioctl(0, TIOCSETP, (char *)&defarg);
369	ioctl(0, TIOCSETC, (char *)&defchars);
370	ioctl(0, TIOCSLTC, (char *)&deflchars);
371#endif /* HAVE_TERMIOS */
372}
373
374static	jmp_buf promptbuf;
375
376/*
377 * Print string ``s'', then read a string
378 *  in from the terminal.  Handles signals & allows use of
379 *  normal erase and kill characters.
380 */
381int
382prompt(s, p, sz)
383	char *s;
384	register char *p;
385	size_t sz;
386{
387	register char *b = p;
388	sig_t oint, oquit;
389
390	stoprompt = 0;
391	oint = signal(SIGINT, intprompt);
392	oquit = signal(SIGQUIT, SIG_IGN);
393	unraw();
394	printf("%s", s);
395	if (setjmp(promptbuf) == 0)
396		while ((*p = getchar()) != EOF && *p != '\n' && --sz > 0)
397			p++;
398	*p = '\0';
399
400	raw();
401	(void)signal(SIGINT, oint);
402	(void)signal(SIGQUIT, oquit);
403	return (stoprompt || p == b);
404}
405
406/*
407 * Interrupt service routine during prompting
408 */
409void
410intprompt()
411{
412
413	(void)signal(SIGINT, SIG_IGN);
414	stoprompt = 1;
415	printf("\r\n");
416	longjmp(promptbuf, 1);
417}
418
419/*
420 * ****TIPIN   TIPIN****
421 */
422void
423tipin()
424{
425	int i;
426	char gch, bol = 1;
427
428	/*
429	 * Kinda klugey here...
430	 *   check for scripting being turned on from the .tiprc file,
431	 *   but be careful about just using setscript(), as we may
432	 *   send a SIGEMT before tipout has a chance to set up catching
433	 *   it; so wait a second, then setscript()
434	 */
435	if (boolean(value(SCRIPT))) {
436		sleep(1);
437		setscript();
438	}
439
440	while (1) {
441		i = getchar();
442		if (i == EOF)
443			break;
444		gch = i&0177;
445		if ((gch == character(value(ESCAPE))) && bol) {
446			if (!(gch = escape()))
447				continue;
448		} else if (!cumode && gch == character(value(RAISECHAR))) {
449			boolean(value(RAISE)) = !boolean(value(RAISE));
450			continue;
451		} else if (gch == '\r') {
452			bol = 1;
453			pwrite(FD, &gch, 1);
454			if (boolean(value(HALFDUPLEX)))
455				printf("\r\n");
456			continue;
457		} else if (!cumode && gch == character(value(FORCE))) {
458			i = getchar();
459			if (i == EOF)
460				break;
461			gch = i & 0177;
462		}
463		bol = any(gch, value(EOL));
464		if (boolean(value(RAISE)) && islower(gch))
465			gch = toupper(gch);
466		pwrite(FD, &gch, 1);
467		if (boolean(value(HALFDUPLEX)))
468			printf("%c", gch);
469	}
470}
471
472extern esctable_t etable[];
473
474/*
475 * Escape handler --
476 *  called on recognition of ``escapec'' at the beginning of a line
477 */
478char
479escape()
480{
481	register char gch;
482	register esctable_t *p;
483	char c = character(value(ESCAPE));
484	int i;
485
486	i = getchar();
487	if (i == EOF)
488		return 0;
489	gch = (i&0177);
490	for (p = etable; p->e_char; p++)
491		if (p->e_char == gch) {
492			if ((p->e_flags&PRIV) && uid)
493				continue;
494			printf("%s", ctrl(c));
495			(*p->e_func)(gch);
496			return (0);
497		}
498	/* ESCAPE ESCAPE forces ESCAPE */
499	if (c != gch)
500		pwrite(FD, &c, 1);
501	return (gch);
502}
503
504int
505speed(n)
506	int n;
507{
508#if HAVE_TERMIOS
509	return (n);
510#else
511	register CONST int *p;
512
513	for (p = bauds; *p != -1;  p++)
514		if (*p == n)
515			return (p - bauds);
516	return (NULL);
517#endif
518}
519
520int
521any(c, p)
522	register char c, *p;
523{
524	while (p && *p)
525		if (*p++ == c)
526			return (1);
527	return (0);
528}
529
530int
531size(s)
532	register char	*s;
533{
534	register int i = 0;
535
536	while (s && *s++)
537		i++;
538	return (i);
539}
540
541char *
542interp(s)
543	register char *s;
544{
545	static char buf[256];
546	register char *p = buf, c, *q;
547
548	while ((c = *s++)) {
549		for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
550			if (*q++ == c) {
551				*p++ = '\\'; *p++ = *q;
552				goto next;
553			}
554		if (c < 040) {
555			*p++ = '^'; *p++ = c + 'A'-1;
556		} else if (c == 0177) {
557			*p++ = '^'; *p++ = '?';
558		} else
559			*p++ = c;
560	next:
561		;
562	}
563	*p = '\0';
564	return (buf);
565}
566
567char *
568ctrl(c)
569	char c;
570{
571	static char s[3];
572
573	if (c < 040 || c == 0177) {
574		s[0] = '^';
575		s[1] = c == 0177 ? '?' : c+'A'-1;
576		s[2] = '\0';
577	} else {
578		s[0] = c;
579		s[1] = '\0';
580	}
581	return (s);
582}
583
584/*
585 * Help command
586 */
587void
588help(c)
589	char c;
590{
591	register esctable_t *p;
592
593	printf("%c\r\n", c);
594	for (p = etable; p->e_char; p++) {
595		if ((p->e_flags&PRIV) && uid)
596			continue;
597		printf("%2s", ctrl(character(value(ESCAPE))));
598		printf("%-2s %c   %s\r\n", ctrl(p->e_char),
599			p->e_flags&EXP ? '*': ' ', p->e_help);
600	}
601}
602
603/*
604 * Set up the "remote" tty's state
605 */
606void
607ttysetup (int speed)
608{
609#if HAVE_TERMIOS
610	struct termios termios;
611	tcgetattr (FD, &termios);
612	if (boolean(value(TAND)))
613		termios.c_iflag = IXOFF;
614	else
615		termios.c_iflag = 0;
616#ifndef _POSIX_SOURCE
617	termios.c_lflag = (PENDIN|ECHOKE|ECHOE);
618#else
619	termios.c_lflag = (PENDIN|ECHOE);
620#endif
621	termios.c_cflag = (CLOCAL|HUPCL|CREAD|CS8);
622	termios.c_ispeed = termios.c_ospeed = speed;
623	tcsetattr (FD, TCSANOW, &termios);
624#else /* HAVE_TERMIOS */
625	unsigned bits = LDECCTQ;
626
627	arg.sg_ispeed = arg.sg_ospeed = speed;
628	arg.sg_flags = RAW;
629	if (boolean(value(TAND)))
630		arg.sg_flags |= TANDEM;
631	ioctl(FD, TIOCSETP, (char *)&arg);
632	ioctl(FD, TIOCLBIS, (char *)&bits);
633#endif /* HAVE_TERMIOS */
634}
635
636/*
637 * Return "simple" name from a file name,
638 * strip leading directories.
639 */
640char *
641sname(s)
642	register char *s;
643{
644	register char *p = s;
645
646	while (*s)
647		if (*s++ == '/')
648			p = s;
649	return (p);
650}
651
652static char partab[0200];
653static int bits8;
654
655/*
656 * Do a write to the remote machine with the correct parity.
657 * We are doing 8 bit wide output, so we just generate a character
658 * with the right parity and output it.
659 */
660void
661pwrite(fd, buf, n)
662	int fd;
663	char *buf;
664	register int n;
665{
666	register int i;
667	register char *bp;
668	extern int errno;
669
670	bp = buf;
671	if (bits8 == 0)
672		for (i = 0; i < n; i++) {
673			*bp = partab[(*bp) & 0177];
674			bp++;
675		}
676	if (write(fd, buf, n) < 0) {
677		if (errno == EIO)
678			tipabort("Lost carrier.");
679		if (errno == ENODEV)
680			tipabort("tty not available.");
681		tipabort("Something wrong...");
682	}
683}
684
685/*
686 * Build a parity table with appropriate high-order bit.
687 */
688void
689setparity(defparity)
690	char *defparity;
691{
692	register int i, flip, clr, set;
693	char *parity;
694	extern char evenpartab[];
695
696	if (value(PARITY) == NOSTR)
697		value(PARITY) = defparity;
698	parity = value(PARITY);
699	if (equal(parity, "none")) {
700		bits8 = 1;
701		return;
702	}
703	bits8 = 0;
704	flip = 0;
705	clr = 0377;
706	set = 0;
707	if (equal(parity, "odd"))
708		flip = 0200;			/* reverse bit 7 */
709	else if (equal(parity, "zero"))
710		clr = 0177;			/* turn off bit 7 */
711	else if (equal(parity, "one"))
712		set = 0200;			/* turn on bit 7 */
713	else if (!equal(parity, "even")) {
714		(void) fprintf(stderr, "%s: unknown parity value\r\n", parity);
715		(void) fflush(stderr);
716	}
717	for (i = 0; i < 0200; i++)
718		partab[i] = (evenpartab[i] ^ flip) | (set & clr);
719}
720