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tip.c revision 1.7 
      1 /*	$NetBSD: tip.c,v 1.7 1995/08/11 00:10:40 jtc Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #ifndef lint
     37 static char copyright[] =
     38 "@(#) Copyright (c) 1983, 1993\n\
     39 	The Regents of the University of California.  All rights reserved.\n";
     40 #endif /* not lint */
     41 
     42 #ifndef lint
     43 #if 0
     44 static char sccsid[] = "@(#)tip.c	8.1 (Berkeley) 6/6/93";
     45 #endif
     46 static char rcsid[] = "$NetBSD: tip.c,v 1.7 1995/08/11 00:10:40 jtc Exp $";
     47 #endif /* not lint */
     48 
     49 /*
     50  * tip - UNIX link to other systems
     51  *  tip [-v] [-speed] system-name
     52  * or
     53  *  cu phone-number [-s speed] [-l line] [-a acu]
     54  */
     55 #include "tip.h"
     56 #include "pathnames.h"
     57 
     58 /*
     59  * Baud rate mapping table
     60  */
     61 int bauds[] = {
     62 	0, 50, 75, 110, 134, 150, 200, 300, 600,
     63 	1200, 1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200, -1
     64 };
     65 
     66 int	disc = OTTYDISC;		/* tip normally runs this way */
     67 void	intprompt();
     68 void	timeout();
     69 void	cleanup();
     70 char	*sname();
     71 char	PNbuf[256];			/* This limits the size of a number */
     72 
     73 main(argc, argv)
     74 	char *argv[];
     75 {
     76 	char *system = NOSTR;
     77 	register int i;
     78 	register char *p;
     79 	char sbuf[12];
     80 
     81 	gid = getgid();
     82 	egid = getegid();
     83 	uid = getuid();
     84 	euid = geteuid();
     85 	if (equal(sname(argv[0]), "cu")) {
     86 		cumode = 1;
     87 		cumain(argc, argv);
     88 		goto cucommon;
     89 	}
     90 
     91 	if (argc > 4) {
     92 		fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n");
     93 		exit(1);
     94 	}
     95 	if (!isatty(0)) {
     96 		fprintf(stderr, "tip: must be interactive\n");
     97 		exit(1);
     98 	}
     99 
    100 	for (; argc > 1; argv++, argc--) {
    101 		if (argv[1][0] != '-')
    102 			system = argv[1];
    103 		else switch (argv[1][1]) {
    104 
    105 		case 'v':
    106 			vflag++;
    107 			break;
    108 
    109 		case '0': case '1': case '2': case '3': case '4':
    110 		case '5': case '6': case '7': case '8': case '9':
    111 			BR = atoi(&argv[1][1]);
    112 			break;
    113 
    114 		default:
    115 			fprintf(stderr, "tip: %s, unknown option\n", argv[1]);
    116 			break;
    117 		}
    118 	}
    119 
    120 	if (system == NOSTR)
    121 		goto notnumber;
    122 	if (isalpha(*system))
    123 		goto notnumber;
    124 	/*
    125 	 * System name is really a phone number...
    126 	 * Copy the number then stomp on the original (in case the number
    127 	 *	is private, we don't want 'ps' or 'w' to find it).
    128 	 */
    129 	if (strlen(system) > sizeof PNbuf - 1) {
    130 		fprintf(stderr, "tip: phone number too long (max = %d bytes)\n",
    131 			sizeof PNbuf - 1);
    132 		exit(1);
    133 	}
    134 	strncpy( PNbuf, system, sizeof PNbuf - 1 );
    135 	for (p = system; *p; p++)
    136 		*p = '\0';
    137 	PN = PNbuf;
    138 	(void)sprintf(sbuf, "tip%d", BR);
    139 	system = sbuf;
    140 
    141 notnumber:
    142 	(void)signal(SIGINT, cleanup);
    143 	(void)signal(SIGQUIT, cleanup);
    144 	(void)signal(SIGHUP, cleanup);
    145 	(void)signal(SIGTERM, cleanup);
    146 
    147 	if ((i = hunt(system)) == 0) {
    148 		printf("all ports busy\n");
    149 		exit(3);
    150 	}
    151 	if (i == -1) {
    152 		printf("link down\n");
    153 		(void)uu_unlock(uucplock);
    154 		exit(3);
    155 	}
    156 	setbuf(stdout, NULL);
    157 	loginit();
    158 
    159 	/*
    160 	 * Now that we have the logfile and the ACU open
    161 	 *  return to the real uid and gid.  These things will
    162 	 *  be closed on exit.  Swap real and effective uid's
    163 	 *  so we can get the original permissions back
    164 	 *  for removing the uucp lock.
    165 	 */
    166 	user_uid();
    167 
    168 	/*
    169 	 * Kludge, their's no easy way to get the initialization
    170 	 *   in the right order, so force it here
    171 	 */
    172 	if ((PH = getenv("PHONES")) == NOSTR)
    173 		PH = _PATH_PHONES;
    174 	vinit();				/* init variables */
    175 	setparity("even");			/* set the parity table */
    176 	if ((i = speed(number(value(BAUDRATE)))) == NULL) {
    177 		printf("tip: bad baud rate %d\n", number(value(BAUDRATE)));
    178 		daemon_uid();
    179 		(void)uu_unlock(uucplock);
    180 		exit(3);
    181 	}
    182 
    183 	/*
    184 	 * Hardwired connections require the
    185 	 *  line speed set before they make any transmissions
    186 	 *  (this is particularly true of things like a DF03-AC)
    187 	 */
    188 	if (HW)
    189 		ttysetup(i);
    190 	if (p = connect()) {
    191 		printf("\07%s\n[EOT]\n", p);
    192 		daemon_uid();
    193 		(void)uu_unlock(uucplock);
    194 		exit(1);
    195 	}
    196 	if (!HW)
    197 		ttysetup(i);
    198 cucommon:
    199 	/*
    200 	 * From here down the code is shared with
    201 	 * the "cu" version of tip.
    202 	 */
    203 
    204 	ioctl(0, TIOCGETP, (char *)&defarg);
    205 	ioctl(0, TIOCGETC, (char *)&defchars);
    206 	ioctl(0, TIOCGLTC, (char *)&deflchars);
    207 	ioctl(0, TIOCGETD, (char *)&odisc);
    208 	arg = defarg;
    209 	arg.sg_flags = ANYP | CBREAK;
    210 	tchars = defchars;
    211 	tchars.t_intrc = tchars.t_quitc = -1;
    212 	ltchars = deflchars;
    213 	ltchars.t_suspc = ltchars.t_dsuspc = ltchars.t_flushc
    214 		= ltchars.t_lnextc = -1;
    215 	raw();
    216 
    217 	pipe(fildes); pipe(repdes);
    218 	(void)signal(SIGALRM, timeout);
    219 
    220 	/*
    221 	 * Everything's set up now:
    222 	 *	connection established (hardwired or dialup)
    223 	 *	line conditioned (baud rate, mode, etc.)
    224 	 *	internal data structures (variables)
    225 	 * so, fork one process for local side and one for remote.
    226 	 */
    227 	printf(cumode ? "Connected\r\n" : "\07connected\r\n");
    228 	if (pid = fork())
    229 		tipin();
    230 	else
    231 		tipout();
    232 	/*NOTREACHED*/
    233 }
    234 
    235 void
    236 cleanup()
    237 {
    238 
    239 	daemon_uid();
    240 	(void)uu_unlock(uucplock);
    241 	if (odisc)
    242 		ioctl(0, TIOCSETD, (char *)&odisc);
    243 	exit(0);
    244 }
    245 
    246 /*
    247  * Muck with user ID's.  We are setuid to the owner of the lock
    248  * directory when we start.  user_uid() reverses real and effective
    249  * ID's after startup, to run with the user's permissions.
    250  * daemon_uid() switches back to the privileged uid for unlocking.
    251  * Finally, to avoid running a shell with the wrong real uid,
    252  * shell_uid() sets real and effective uid's to the user's real ID.
    253  */
    254 static int uidswapped;
    255 
    256 user_uid()
    257 {
    258 	if (uidswapped == 0) {
    259 		seteuid(uid);
    260 		uidswapped = 1;
    261 	}
    262 }
    263 
    264 daemon_uid()
    265 {
    266 
    267 	if (uidswapped) {
    268 		seteuid(euid);
    269 		uidswapped = 0;
    270 	}
    271 }
    272 
    273 shell_uid()
    274 {
    275 	seteuid(uid);
    276 }
    277 
    278 /*
    279  * put the controlling keyboard into raw mode
    280  */
    281 raw()
    282 {
    283 
    284 	ioctl(0, TIOCSETP, &arg);
    285 	ioctl(0, TIOCSETC, &tchars);
    286 	ioctl(0, TIOCSLTC, &ltchars);
    287 	ioctl(0, TIOCSETD, (char *)&disc);
    288 }
    289 
    290 
    291 /*
    292  * return keyboard to normal mode
    293  */
    294 unraw()
    295 {
    296 
    297 	ioctl(0, TIOCSETD, (char *)&odisc);
    298 	ioctl(0, TIOCSETP, (char *)&defarg);
    299 	ioctl(0, TIOCSETC, (char *)&defchars);
    300 	ioctl(0, TIOCSLTC, (char *)&deflchars);
    301 }
    302 
    303 static	jmp_buf promptbuf;
    304 
    305 /*
    306  * Print string ``s'', then read a string
    307  *  in from the terminal.  Handles signals & allows use of
    308  *  normal erase and kill characters.
    309  */
    310 prompt(s, p)
    311 	char *s;
    312 	register char *p;
    313 {
    314 	register char *b = p;
    315 	sig_t oint, oquit;
    316 
    317 	stoprompt = 0;
    318 	oint = signal(SIGINT, intprompt);
    319 	oquit = signal(SIGQUIT, SIG_IGN);
    320 	unraw();
    321 	printf("%s", s);
    322 	if (setjmp(promptbuf) == 0)
    323 		while ((*p = getchar()) != EOF && *p != '\n')
    324 			p++;
    325 	*p = '\0';
    326 
    327 	raw();
    328 	(void)signal(SIGINT, oint);
    329 	(void)signal(SIGQUIT, oquit);
    330 	return (stoprompt || p == b);
    331 }
    332 
    333 /*
    334  * Interrupt service routine during prompting
    335  */
    336 void
    337 intprompt()
    338 {
    339 
    340 	(void)signal(SIGINT, SIG_IGN);
    341 	stoprompt = 1;
    342 	printf("\r\n");
    343 	longjmp(promptbuf, 1);
    344 }
    345 
    346 /*
    347  * ****TIPIN   TIPIN****
    348  */
    349 tipin()
    350 {
    351 	char gch, bol = 1;
    352 
    353 	/*
    354 	 * Kinda klugey here...
    355 	 *   check for scripting being turned on from the .tiprc file,
    356 	 *   but be careful about just using setscript(), as we may
    357 	 *   send a SIGEMT before tipout has a chance to set up catching
    358 	 *   it; so wait a second, then setscript()
    359 	 */
    360 	if (boolean(value(SCRIPT))) {
    361 		sleep(1);
    362 		setscript();
    363 	}
    364 
    365 	while (1) {
    366 		gch = getchar()&0177;
    367 		if ((gch == character(value(ESCAPE))) && bol) {
    368 			if (!(gch = escape()))
    369 				continue;
    370 		} else if (!cumode && gch == character(value(RAISECHAR))) {
    371 			boolean(value(RAISE)) = !boolean(value(RAISE));
    372 			continue;
    373 		} else if (gch == '\r') {
    374 			bol = 1;
    375 			pwrite(FD, &gch, 1);
    376 			if (boolean(value(HALFDUPLEX)))
    377 				printf("\r\n");
    378 			continue;
    379 		} else if (!cumode && gch == character(value(FORCE)))
    380 			gch = getchar()&0177;
    381 		bol = any(gch, value(EOL));
    382 		if (boolean(value(RAISE)) && islower(gch))
    383 			gch = toupper(gch);
    384 		pwrite(FD, &gch, 1);
    385 		if (boolean(value(HALFDUPLEX)))
    386 			printf("%c", gch);
    387 	}
    388 }
    389 
    390 extern esctable_t etable[];
    391 
    392 /*
    393  * Escape handler --
    394  *  called on recognition of ``escapec'' at the beginning of a line
    395  */
    396 escape()
    397 {
    398 	register char gch;
    399 	register esctable_t *p;
    400 	char c = character(value(ESCAPE));
    401 
    402 	gch = (getchar()&0177);
    403 	for (p = etable; p->e_char; p++)
    404 		if (p->e_char == gch) {
    405 			if ((p->e_flags&PRIV) && uid)
    406 				continue;
    407 			printf("%s", ctrl(c));
    408 			(*p->e_func)(gch);
    409 			return (0);
    410 		}
    411 	/* ESCAPE ESCAPE forces ESCAPE */
    412 	if (c != gch)
    413 		pwrite(FD, &c, 1);
    414 	return (gch);
    415 }
    416 
    417 speed(n)
    418 	int n;
    419 {
    420 	register int *p;
    421 
    422 	for (p = bauds; *p != -1;  p++)
    423 		if (*p == n)
    424 			return (p - bauds);
    425 	return (NULL);
    426 }
    427 
    428 any(c, p)
    429 	register char c, *p;
    430 {
    431 	while (p && *p)
    432 		if (*p++ == c)
    433 			return (1);
    434 	return (0);
    435 }
    436 
    437 size(s)
    438 	register char	*s;
    439 {
    440 	register int i = 0;
    441 
    442 	while (s && *s++)
    443 		i++;
    444 	return (i);
    445 }
    446 
    447 char *
    448 interp(s)
    449 	register char *s;
    450 {
    451 	static char buf[256];
    452 	register char *p = buf, c, *q;
    453 
    454 	while (c = *s++) {
    455 		for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
    456 			if (*q++ == c) {
    457 				*p++ = '\\'; *p++ = *q;
    458 				goto next;
    459 			}
    460 		if (c < 040) {
    461 			*p++ = '^'; *p++ = c + 'A'-1;
    462 		} else if (c == 0177) {
    463 			*p++ = '^'; *p++ = '?';
    464 		} else
    465 			*p++ = c;
    466 	next:
    467 		;
    468 	}
    469 	*p = '\0';
    470 	return (buf);
    471 }
    472 
    473 char *
    474 ctrl(c)
    475 	char c;
    476 {
    477 	static char s[3];
    478 
    479 	if (c < 040 || c == 0177) {
    480 		s[0] = '^';
    481 		s[1] = c == 0177 ? '?' : c+'A'-1;
    482 		s[2] = '\0';
    483 	} else {
    484 		s[0] = c;
    485 		s[1] = '\0';
    486 	}
    487 	return (s);
    488 }
    489 
    490 /*
    491  * Help command
    492  */
    493 help(c)
    494 	char c;
    495 {
    496 	register esctable_t *p;
    497 
    498 	printf("%c\r\n", c);
    499 	for (p = etable; p->e_char; p++) {
    500 		if ((p->e_flags&PRIV) && uid)
    501 			continue;
    502 		printf("%2s", ctrl(character(value(ESCAPE))));
    503 		printf("%-2s %c   %s\r\n", ctrl(p->e_char),
    504 			p->e_flags&EXP ? '*': ' ', p->e_help);
    505 	}
    506 }
    507 
    508 /*
    509  * Set up the "remote" tty's state
    510  */
    511 ttysetup(speed)
    512 	int speed;
    513 {
    514 	unsigned bits = LDECCTQ;
    515 
    516 	arg.sg_ispeed = arg.sg_ospeed = speed;
    517 	arg.sg_flags = RAW;
    518 	if (boolean(value(TAND)))
    519 		arg.sg_flags |= TANDEM;
    520 	ioctl(FD, TIOCSETP, (char *)&arg);
    521 	ioctl(FD, TIOCLBIS, (char *)&bits);
    522 }
    523 
    524 /*
    525  * Return "simple" name from a file name,
    526  * strip leading directories.
    527  */
    528 char *
    529 sname(s)
    530 	register char *s;
    531 {
    532 	register char *p = s;
    533 
    534 	while (*s)
    535 		if (*s++ == '/')
    536 			p = s;
    537 	return (p);
    538 }
    539 
    540 static char partab[0200];
    541 static int bits8;
    542 
    543 /*
    544  * Do a write to the remote machine with the correct parity.
    545  * We are doing 8 bit wide output, so we just generate a character
    546  * with the right parity and output it.
    547  */
    548 pwrite(fd, buf, n)
    549 	int fd;
    550 	char *buf;
    551 	register int n;
    552 {
    553 	register int i;
    554 	register char *bp;
    555 	extern int errno;
    556 
    557 	bp = buf;
    558 	if (bits8 == 0)
    559 		for (i = 0; i < n; i++) {
    560 			*bp = partab[(*bp) & 0177];
    561 			bp++;
    562 		}
    563 	if (write(fd, buf, n) < 0) {
    564 		if (errno == EIO)
    565 			tipabort("Lost carrier.");
    566 		/* this is questionable */
    567 		perror("write");
    568 	}
    569 }
    570 
    571 /*
    572  * Build a parity table with appropriate high-order bit.
    573  */
    574 setparity(defparity)
    575 	char *defparity;
    576 {
    577 	register int i, flip, clr, set;
    578 	char *parity;
    579 	extern char evenpartab[];
    580 
    581 	if (value(PARITY) == NOSTR)
    582 		value(PARITY) = defparity;
    583 	parity = value(PARITY);
    584 	if (equal(parity, "none")) {
    585 		bits8 = 1;
    586 		return;
    587 	}
    588 	bits8 = 0;
    589 	flip = 0;
    590 	clr = 0377;
    591 	set = 0;
    592 	if (equal(parity, "odd"))
    593 		flip = 0200;			/* reverse bit 7 */
    594 	else if (equal(parity, "zero"))
    595 		clr = 0177;			/* turn off bit 7 */
    596 	else if (equal(parity, "one"))
    597 		set = 0200;			/* turn on bit 7 */
    598 	else if (!equal(parity, "even")) {
    599 		(void) fprintf(stderr, "%s: unknown parity value\r\n", parity);
    600 		(void) fflush(stderr);
    601 	}
    602 	for (i = 0; i < 0200; i++)
    603 		partab[i] = (evenpartab[i] ^ flip | set) & clr;
    604 }
    605