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tip.c revision 1.1.1.2 
      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
     35 static 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 static char sccsid[] = "@(#)tip.c	8.1 (Berkeley) 6/6/93";
     42 #endif /* not lint */
     43 
     44 /*
     45  * tip - UNIX link to other systems
     46  *  tip [-v] [-speed] system-name
     47  * or
     48  *  cu phone-number [-s speed] [-l line] [-a acu]
     49  */
     50 #include "tip.h"
     51 #include "pathnames.h"
     52 
     53 /*
     54  * Baud rate mapping table
     55  */
     56 int bauds[] = {
     57 	0, 50, 75, 110, 134, 150, 200, 300, 600,
     58 	1200, 1800, 2400, 4800, 9600, 19200, -1
     59 };
     60 
     61 int	disc = OTTYDISC;		/* tip normally runs this way */
     62 void	intprompt();
     63 void	timeout();
     64 void	cleanup();
     65 char	*sname();
     66 char	PNbuf[256];			/* This limits the size of a number */
     67 
     68 main(argc, argv)
     69 	char *argv[];
     70 {
     71 	char *system = NOSTR;
     72 	register int i;
     73 	register char *p;
     74 	char sbuf[12];
     75 
     76 	gid = getgid();
     77 	egid = getegid();
     78 	uid = getuid();
     79 	euid = geteuid();
     80 	if (equal(sname(argv[0]), "cu")) {
     81 		cumode = 1;
     82 		cumain(argc, argv);
     83 		goto cucommon;
     84 	}
     85 
     86 	if (argc > 4) {
     87 		fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n");
     88 		exit(1);
     89 	}
     90 	if (!isatty(0)) {
     91 		fprintf(stderr, "tip: must be interactive\n");
     92 		exit(1);
     93 	}
     94 
     95 	for (; argc > 1; argv++, argc--) {
     96 		if (argv[1][0] != '-')
     97 			system = argv[1];
     98 		else switch (argv[1][1]) {
     99 
    100 		case 'v':
    101 			vflag++;
    102 			break;
    103 
    104 		case '0': case '1': case '2': case '3': case '4':
    105 		case '5': case '6': case '7': case '8': case '9':
    106 			BR = atoi(&argv[1][1]);
    107 			break;
    108 
    109 		default:
    110 			fprintf(stderr, "tip: %s, unknown option\n", argv[1]);
    111 			break;
    112 		}
    113 	}
    114 
    115 	if (system == NOSTR)
    116 		goto notnumber;
    117 	if (isalpha(*system))
    118 		goto notnumber;
    119 	/*
    120 	 * System name is really a phone number...
    121 	 * Copy the number then stomp on the original (in case the number
    122 	 *	is private, we don't want 'ps' or 'w' to find it).
    123 	 */
    124 	if (strlen(system) > sizeof PNbuf - 1) {
    125 		fprintf(stderr, "tip: phone number too long (max = %d bytes)\n",
    126 			sizeof PNbuf - 1);
    127 		exit(1);
    128 	}
    129 	strncpy( PNbuf, system, sizeof PNbuf - 1 );
    130 	for (p = system; *p; p++)
    131 		*p = '\0';
    132 	PN = PNbuf;
    133 	(void)sprintf(sbuf, "tip%d", BR);
    134 	system = sbuf;
    135 
    136 notnumber:
    137 	(void)signal(SIGINT, cleanup);
    138 	(void)signal(SIGQUIT, cleanup);
    139 	(void)signal(SIGHUP, cleanup);
    140 	(void)signal(SIGTERM, cleanup);
    141 
    142 	if ((i = hunt(system)) == 0) {
    143 		printf("all ports busy\n");
    144 		exit(3);
    145 	}
    146 	if (i == -1) {
    147 		printf("link down\n");
    148 		(void)uu_unlock(uucplock);
    149 		exit(3);
    150 	}
    151 	setbuf(stdout, NULL);
    152 	loginit();
    153 
    154 	/*
    155 	 * Kludge, their's no easy way to get the initialization
    156 	 *   in the right order, so force it here
    157 	 */
    158 	if ((PH = getenv("PHONES")) == NOSTR)
    159 		PH = _PATH_PHONES;
    160 	vinit();				/* init variables */
    161 	setparity("even");			/* set the parity table */
    162 	if ((i = speed(number(value(BAUDRATE)))) == NULL) {
    163 		printf("tip: bad baud rate %d\n", number(value(BAUDRATE)));
    164 		(void)uu_unlock(uucplock);
    165 		exit(3);
    166 	}
    167 
    168 	/*
    169 	 * Now that we have the logfile and the ACU open
    170 	 *  return to the real uid and gid.  These things will
    171 	 *  be closed on exit.  Swap real and effective uid's
    172 	 *  so we can get the original permissions back
    173 	 *  for removing the uucp lock.
    174 	 */
    175 	user_uid();
    176 
    177 	/*
    178 	 * Hardwired connections require the
    179 	 *  line speed set before they make any transmissions
    180 	 *  (this is particularly true of things like a DF03-AC)
    181 	 */
    182 	if (HW)
    183 		ttysetup(i);
    184 	if (p = connect()) {
    185 		printf("\07%s\n[EOT]\n", p);
    186 		daemon_uid();
    187 		(void)uu_unlock(uucplock);
    188 		exit(1);
    189 	}
    190 	if (!HW)
    191 		ttysetup(i);
    192 cucommon:
    193 	/*
    194 	 * From here down the code is shared with
    195 	 * the "cu" version of tip.
    196 	 */
    197 
    198 	ioctl(0, TIOCGETP, (char *)&defarg);
    199 	ioctl(0, TIOCGETC, (char *)&defchars);
    200 	ioctl(0, TIOCGLTC, (char *)&deflchars);
    201 	ioctl(0, TIOCGETD, (char *)&odisc);
    202 	arg = defarg;
    203 	arg.sg_flags = ANYP | CBREAK;
    204 	tchars = defchars;
    205 	tchars.t_intrc = tchars.t_quitc = -1;
    206 	ltchars = deflchars;
    207 	ltchars.t_suspc = ltchars.t_dsuspc = ltchars.t_flushc
    208 		= ltchars.t_lnextc = -1;
    209 	raw();
    210 
    211 	pipe(fildes); pipe(repdes);
    212 	(void)signal(SIGALRM, timeout);
    213 
    214 	/*
    215 	 * Everything's set up now:
    216 	 *	connection established (hardwired or dialup)
    217 	 *	line conditioned (baud rate, mode, etc.)
    218 	 *	internal data structures (variables)
    219 	 * so, fork one process for local side and one for remote.
    220 	 */
    221 	printf(cumode ? "Connected\r\n" : "\07connected\r\n");
    222 	if (pid = fork())
    223 		tipin();
    224 	else
    225 		tipout();
    226 	/*NOTREACHED*/
    227 }
    228 
    229 void
    230 cleanup()
    231 {
    232 
    233 	daemon_uid();
    234 	(void)uu_unlock(uucplock);
    235 	if (odisc)
    236 		ioctl(0, TIOCSETD, (char *)&odisc);
    237 	exit(0);
    238 }
    239 
    240 /*
    241  * Muck with user ID's.  We are setuid to the owner of the lock
    242  * directory when we start.  user_uid() reverses real and effective
    243  * ID's after startup, to run with the user's permissions.
    244  * daemon_uid() switches back to the privileged uid for unlocking.
    245  * Finally, to avoid running a shell with the wrong real uid,
    246  * shell_uid() sets real and effective uid's to the user's real ID.
    247  */
    248 static int uidswapped;
    249 
    250 user_uid()
    251 {
    252 	if (uidswapped == 0) {
    253 		seteuid(uid);
    254 		uidswapped = 1;
    255 	}
    256 }
    257 
    258 daemon_uid()
    259 {
    260 
    261 	if (uidswapped) {
    262 		seteuid(euid);
    263 		uidswapped = 0;
    264 	}
    265 }
    266 
    267 shell_uid()
    268 {
    269 
    270 	seteuid(uid);
    271 }
    272 
    273 /*
    274  * put the controlling keyboard into raw mode
    275  */
    276 raw()
    277 {
    278 
    279 	ioctl(0, TIOCSETP, &arg);
    280 	ioctl(0, TIOCSETC, &tchars);
    281 	ioctl(0, TIOCSLTC, &ltchars);
    282 	ioctl(0, TIOCSETD, (char *)&disc);
    283 }
    284 
    285 
    286 /*
    287  * return keyboard to normal mode
    288  */
    289 unraw()
    290 {
    291 
    292 	ioctl(0, TIOCSETD, (char *)&odisc);
    293 	ioctl(0, TIOCSETP, (char *)&defarg);
    294 	ioctl(0, TIOCSETC, (char *)&defchars);
    295 	ioctl(0, TIOCSLTC, (char *)&deflchars);
    296 }
    297 
    298 static	jmp_buf promptbuf;
    299 
    300 /*
    301  * Print string ``s'', then read a string
    302  *  in from the terminal.  Handles signals & allows use of
    303  *  normal erase and kill characters.
    304  */
    305 prompt(s, p)
    306 	char *s;
    307 	register char *p;
    308 {
    309 	register char *b = p;
    310 	sig_t oint, oquit;
    311 
    312 	stoprompt = 0;
    313 	oint = signal(SIGINT, intprompt);
    314 	oquit = signal(SIGQUIT, SIG_IGN);
    315 	unraw();
    316 	printf("%s", s);
    317 	if (setjmp(promptbuf) == 0)
    318 		while ((*p = getchar()) != EOF && *p != '\n')
    319 			p++;
    320 	*p = '\0';
    321 
    322 	raw();
    323 	(void)signal(SIGINT, oint);
    324 	(void)signal(SIGQUIT, oquit);
    325 	return (stoprompt || p == b);
    326 }
    327 
    328 /*
    329  * Interrupt service routine during prompting
    330  */
    331 void
    332 intprompt()
    333 {
    334 
    335 	(void)signal(SIGINT, SIG_IGN);
    336 	stoprompt = 1;
    337 	printf("\r\n");
    338 	longjmp(promptbuf, 1);
    339 }
    340 
    341 /*
    342  * ****TIPIN   TIPIN****
    343  */
    344 tipin()
    345 {
    346 	char gch, bol = 1;
    347 
    348 	/*
    349 	 * Kinda klugey here...
    350 	 *   check for scripting being turned on from the .tiprc file,
    351 	 *   but be careful about just using setscript(), as we may
    352 	 *   send a SIGEMT before tipout has a chance to set up catching
    353 	 *   it; so wait a second, then setscript()
    354 	 */
    355 	if (boolean(value(SCRIPT))) {
    356 		sleep(1);
    357 		setscript();
    358 	}
    359 
    360 	while (1) {
    361 		gch = getchar()&0177;
    362 		if ((gch == character(value(ESCAPE))) && bol) {
    363 			if (!(gch = escape()))
    364 				continue;
    365 		} else if (!cumode && gch == character(value(RAISECHAR))) {
    366 			boolean(value(RAISE)) = !boolean(value(RAISE));
    367 			continue;
    368 		} else if (gch == '\r') {
    369 			bol = 1;
    370 			pwrite(FD, &gch, 1);
    371 			if (boolean(value(HALFDUPLEX)))
    372 				printf("\r\n");
    373 			continue;
    374 		} else if (!cumode && gch == character(value(FORCE)))
    375 			gch = getchar()&0177;
    376 		bol = any(gch, value(EOL));
    377 		if (boolean(value(RAISE)) && islower(gch))
    378 			gch = toupper(gch);
    379 		pwrite(FD, &gch, 1);
    380 		if (boolean(value(HALFDUPLEX)))
    381 			printf("%c", gch);
    382 	}
    383 }
    384 
    385 extern esctable_t etable[];
    386 
    387 /*
    388  * Escape handler --
    389  *  called on recognition of ``escapec'' at the beginning of a line
    390  */
    391 escape()
    392 {
    393 	register char gch;
    394 	register esctable_t *p;
    395 	char c = character(value(ESCAPE));
    396 
    397 	gch = (getchar()&0177);
    398 	for (p = etable; p->e_char; p++)
    399 		if (p->e_char == gch) {
    400 			if ((p->e_flags&PRIV) && uid)
    401 				continue;
    402 			printf("%s", ctrl(c));
    403 			(*p->e_func)(gch);
    404 			return (0);
    405 		}
    406 	/* ESCAPE ESCAPE forces ESCAPE */
    407 	if (c != gch)
    408 		pwrite(FD, &c, 1);
    409 	return (gch);
    410 }
    411 
    412 speed(n)
    413 	int n;
    414 {
    415 	register int *p;
    416 
    417 	for (p = bauds; *p != -1;  p++)
    418 		if (*p == n)
    419 			return (p - bauds);
    420 	return (NULL);
    421 }
    422 
    423 any(c, p)
    424 	register char c, *p;
    425 {
    426 	while (p && *p)
    427 		if (*p++ == c)
    428 			return (1);
    429 	return (0);
    430 }
    431 
    432 size(s)
    433 	register char	*s;
    434 {
    435 	register int i = 0;
    436 
    437 	while (s && *s++)
    438 		i++;
    439 	return (i);
    440 }
    441 
    442 char *
    443 interp(s)
    444 	register char *s;
    445 {
    446 	static char buf[256];
    447 	register char *p = buf, c, *q;
    448 
    449 	while (c = *s++) {
    450 		for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
    451 			if (*q++ == c) {
    452 				*p++ = '\\'; *p++ = *q;
    453 				goto next;
    454 			}
    455 		if (c < 040) {
    456 			*p++ = '^'; *p++ = c + 'A'-1;
    457 		} else if (c == 0177) {
    458 			*p++ = '^'; *p++ = '?';
    459 		} else
    460 			*p++ = c;
    461 	next:
    462 		;
    463 	}
    464 	*p = '\0';
    465 	return (buf);
    466 }
    467 
    468 char *
    469 ctrl(c)
    470 	char c;
    471 {
    472 	static char s[3];
    473 
    474 	if (c < 040 || c == 0177) {
    475 		s[0] = '^';
    476 		s[1] = c == 0177 ? '?' : c+'A'-1;
    477 		s[2] = '\0';
    478 	} else {
    479 		s[0] = c;
    480 		s[1] = '\0';
    481 	}
    482 	return (s);
    483 }
    484 
    485 /*
    486  * Help command
    487  */
    488 help(c)
    489 	char c;
    490 {
    491 	register esctable_t *p;
    492 
    493 	printf("%c\r\n", c);
    494 	for (p = etable; p->e_char; p++) {
    495 		if ((p->e_flags&PRIV) && uid)
    496 			continue;
    497 		printf("%2s", ctrl(character(value(ESCAPE))));
    498 		printf("%-2s %c   %s\r\n", ctrl(p->e_char),
    499 			p->e_flags&EXP ? '*': ' ', p->e_help);
    500 	}
    501 }
    502 
    503 /*
    504  * Set up the "remote" tty's state
    505  */
    506 ttysetup(speed)
    507 	int speed;
    508 {
    509 	unsigned bits = LDECCTQ;
    510 
    511 	arg.sg_ispeed = arg.sg_ospeed = speed;
    512 	arg.sg_flags = RAW;
    513 	if (boolean(value(TAND)))
    514 		arg.sg_flags |= TANDEM;
    515 	ioctl(FD, TIOCSETP, (char *)&arg);
    516 	ioctl(FD, TIOCLBIS, (char *)&bits);
    517 }
    518 
    519 /*
    520  * Return "simple" name from a file name,
    521  * strip leading directories.
    522  */
    523 char *
    524 sname(s)
    525 	register char *s;
    526 {
    527 	register char *p = s;
    528 
    529 	while (*s)
    530 		if (*s++ == '/')
    531 			p = s;
    532 	return (p);
    533 }
    534 
    535 static char partab[0200];
    536 static int bits8;
    537 
    538 /*
    539  * Do a write to the remote machine with the correct parity.
    540  * We are doing 8 bit wide output, so we just generate a character
    541  * with the right parity and output it.
    542  */
    543 pwrite(fd, buf, n)
    544 	int fd;
    545 	char *buf;
    546 	register int n;
    547 {
    548 	register int i;
    549 	register char *bp;
    550 	extern int errno;
    551 
    552 	bp = buf;
    553 	if (bits8 == 0)
    554 		for (i = 0; i < n; i++) {
    555 			*bp = partab[(*bp) & 0177];
    556 			bp++;
    557 		}
    558 	if (write(fd, buf, n) < 0) {
    559 		if (errno == EIO)
    560 			tipabort("Lost carrier.");
    561 		/* this is questionable */
    562 		perror("write");
    563 	}
    564 }
    565 
    566 /*
    567  * Build a parity table with appropriate high-order bit.
    568  */
    569 setparity(defparity)
    570 	char *defparity;
    571 {
    572 	register int i, flip, clr, set;
    573 	char *parity;
    574 	extern char evenpartab[];
    575 
    576 	if (value(PARITY) == NOSTR)
    577 		value(PARITY) = defparity;
    578 	parity = value(PARITY);
    579 	if (equal(parity, "none")) {
    580 		bits8 = 1;
    581 		return;
    582 	}
    583 	bits8 = 0;
    584 	flip = 0;
    585 	clr = 0377;
    586 	set = 0;
    587 	if (equal(parity, "odd"))
    588 		flip = 0200;			/* reverse bit 7 */
    589 	else if (equal(parity, "zero"))
    590 		clr = 0177;			/* turn off bit 7 */
    591 	else if (equal(parity, "one"))
    592 		set = 0200;			/* turn on bit 7 */
    593 	else if (!equal(parity, "even")) {
    594 		(void) fprintf(stderr, "%s: unknown parity value\r\n", parity);
    595 		(void) fflush(stderr);
    596 	}
    597 	for (i = 0; i < 0200; i++)
    598 		partab[i] = evenpartab[i] ^ flip | set & clr;
    599 }
    600