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tip.c revision 1.11 
      1 /*	$NetBSD: tip.c,v 1.11 1997/02/11 09:24:06 mrg 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 1.11 1997/02/11 09:24:06 mrg 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 rates[] = {
     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 = TTYDISC;		/* 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)snprintf(sbuf, sizeof 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)))) == 0) {
    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 	tcgetattr(0, &defterm);
    205 	term = defterm;
    206 	term.c_lflag &= ~(ICANON|IEXTEN|ECHO);
    207 	term.c_iflag &= ~(INPCK|ICRNL);
    208 	term.c_oflag &= ~OPOST;
    209 	term.c_cc[VMIN] = 1;
    210 	term.c_cc[VTIME] = 0;
    211 	defchars = term;
    212 	term.c_cc[VINTR] = term.c_cc[VQUIT] = term.c_cc[VSUSP] =
    213 		term.c_cc[VDSUSP] = term.c_cc[VDISCARD] =
    214 	 	term.c_cc[VLNEXT] = _POSIX_VDISABLE;
    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 	tcsetattr(0, TCSADRAIN, &term);
    284 }
    285 
    286 
    287 /*
    288  * return keyboard to normal mode
    289  */
    290 unraw()
    291 {
    292 	tcsetattr(0, TCSADRAIN, &defterm);
    293 }
    294 
    295 static	jmp_buf promptbuf;
    296 
    297 /*
    298  * Print string ``s'', then read a string
    299  *  in from the terminal.  Handles signals & allows use of
    300  *  normal erase and kill characters.
    301  */
    302 prompt(s, p)
    303 	char *s;
    304 	register char *p;
    305 {
    306 	register char *b = p;
    307 	sig_t oint, oquit;
    308 
    309 	stoprompt = 0;
    310 	oint = signal(SIGINT, intprompt);
    311 	oquit = signal(SIGQUIT, SIG_IGN);
    312 	unraw();
    313 	printf("%s", s);
    314 	if (setjmp(promptbuf) == 0)
    315 		while ((*p = getchar()) != EOF && *p != '\n')
    316 			p++;
    317 	*p = '\0';
    318 
    319 	raw();
    320 	(void)signal(SIGINT, oint);
    321 	(void)signal(SIGQUIT, oquit);
    322 	return (stoprompt || p == b);
    323 }
    324 
    325 /*
    326  * Interrupt service routine during prompting
    327  */
    328 void
    329 intprompt()
    330 {
    331 
    332 	(void)signal(SIGINT, SIG_IGN);
    333 	stoprompt = 1;
    334 	printf("\r\n");
    335 	longjmp(promptbuf, 1);
    336 }
    337 
    338 /*
    339  * ****TIPIN   TIPIN****
    340  */
    341 tipin()
    342 {
    343 	char gch, bol = 1;
    344 
    345 	/*
    346 	 * Kinda klugey here...
    347 	 *   check for scripting being turned on from the .tiprc file,
    348 	 *   but be careful about just using setscript(), as we may
    349 	 *   send a SIGEMT before tipout has a chance to set up catching
    350 	 *   it; so wait a second, then setscript()
    351 	 */
    352 	if (boolean(value(SCRIPT))) {
    353 		sleep(1);
    354 		setscript();
    355 	}
    356 
    357 	while (1) {
    358 		gch = getchar()&STRIP_PAR;
    359 		if ((gch == character(value(ESCAPE))) && bol) {
    360 			if (!(gch = escape()))
    361 				continue;
    362 		} else if (!cumode && gch == character(value(RAISECHAR))) {
    363 			setboolean(value(RAISE), !boolean(value(RAISE)));
    364 			continue;
    365 		} else if (gch == '\r') {
    366 			bol = 1;
    367 			pwrite(FD, &gch, 1);
    368 			if (boolean(value(HALFDUPLEX)))
    369 				printf("\r\n");
    370 			continue;
    371 		} else if (!cumode && gch == character(value(FORCE)))
    372 			gch = getchar()&STRIP_PAR;
    373 		bol = any(gch, value(EOL));
    374 		if (boolean(value(RAISE)) && islower(gch))
    375 			gch = toupper(gch);
    376 		pwrite(FD, &gch, 1);
    377 		if (boolean(value(HALFDUPLEX)))
    378 			printf("%c", gch);
    379 	}
    380 }
    381 
    382 extern esctable_t etable[];
    383 
    384 /*
    385  * Escape handler --
    386  *  called on recognition of ``escapec'' at the beginning of a line
    387  */
    388 escape()
    389 {
    390 	register char gch;
    391 	register esctable_t *p;
    392 	char c = character(value(ESCAPE));
    393 
    394 	gch = (getchar()&STRIP_PAR);
    395 	for (p = etable; p->e_char; p++)
    396 		if (p->e_char == gch) {
    397 			if ((p->e_flags&PRIV) && uid)
    398 				continue;
    399 			printf("%s", ctrl(c));
    400 			(*p->e_func)(gch);
    401 			return (0);
    402 		}
    403 	/* ESCAPE ESCAPE forces ESCAPE */
    404 	if (c != gch)
    405 		pwrite(FD, &c, 1);
    406 	return (gch);
    407 }
    408 
    409 speed(n)
    410 	int n;
    411 {
    412 	register int *p;
    413 
    414 	for (p = rates; *p != -1;  p++)
    415 		if (*p == n)
    416 			return n;
    417 	return 0;
    418 }
    419 
    420 any(c, p)
    421 	register char c, *p;
    422 {
    423 	while (p && *p)
    424 		if (*p++ == c)
    425 			return (1);
    426 	return (0);
    427 }
    428 
    429 size(s)
    430 	register char	*s;
    431 {
    432 	register int i = 0;
    433 
    434 	while (s && *s++)
    435 		i++;
    436 	return (i);
    437 }
    438 
    439 char *
    440 interp(s)
    441 	register char *s;
    442 {
    443 	static char buf[256];
    444 	register char *p = buf, c, *q;
    445 
    446 	while (c = *s++) {
    447 		for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
    448 			if (*q++ == c) {
    449 				*p++ = '\\'; *p++ = *q;
    450 				goto next;
    451 			}
    452 		if (c < 040) {
    453 			*p++ = '^'; *p++ = c + 'A'-1;
    454 		} else if (c == 0177) {
    455 			*p++ = '^'; *p++ = '?';
    456 		} else
    457 			*p++ = c;
    458 	next:
    459 		;
    460 	}
    461 	*p = '\0';
    462 	return (buf);
    463 }
    464 
    465 char *
    466 ctrl(c)
    467 	char c;
    468 {
    469 	static char s[3];
    470 
    471 	if (c < 040 || c == 0177) {
    472 		s[0] = '^';
    473 		s[1] = c == 0177 ? '?' : c+'A'-1;
    474 		s[2] = '\0';
    475 	} else {
    476 		s[0] = c;
    477 		s[1] = '\0';
    478 	}
    479 	return (s);
    480 }
    481 
    482 /*
    483  * Help command
    484  */
    485 help(c)
    486 	char c;
    487 {
    488 	register esctable_t *p;
    489 
    490 	printf("%c\r\n", c);
    491 	for (p = etable; p->e_char; p++) {
    492 		if ((p->e_flags&PRIV) && uid)
    493 			continue;
    494 		printf("%2s", ctrl(character(value(ESCAPE))));
    495 		printf("%-2s %c   %s\r\n", ctrl(p->e_char),
    496 			p->e_flags&EXP ? '*': ' ', p->e_help);
    497 	}
    498 }
    499 
    500 /*
    501  * Set up the "remote" tty's state
    502  */
    503 ttysetup(speed)
    504 	int speed;
    505 {
    506 	struct termios	cntrl;
    507 
    508 	tcgetattr(FD, &cntrl);
    509 	cfsetospeed(&cntrl, speed);
    510 	cfsetispeed(&cntrl, speed);
    511 	cntrl.c_cflag &= ~(CSIZE|PARENB);
    512 	cntrl.c_cflag |= CS8;
    513 	cntrl.c_iflag &= ~(ISTRIP|ICRNL);
    514 	cntrl.c_oflag &= ~OPOST;
    515 	cntrl.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
    516 	cntrl.c_cc[VMIN] = 1;
    517 	cntrl.c_cc[VTIME] = 0;
    518 	if (boolean(value(TAND)))
    519 		cntrl.c_iflag |= IXOFF;
    520 	tcsetattr(FD, TCSAFLUSH, &cntrl);
    521 }
    522 
    523 /*
    524  * Return "simple" name from a file name,
    525  * strip leading directories.
    526  */
    527 char *
    528 sname(s)
    529 	register char *s;
    530 {
    531 	register char *p = s;
    532 
    533 	while (*s)
    534 		if (*s++ == '/')
    535 			p = s;
    536 	return (p);
    537 }
    538 
    539 static char partab[0200];
    540 
    541 /*
    542  * Do a write to the remote machine with the correct parity.
    543  * We are doing 8 bit wide output, so we just generate a character
    544  * with the right parity and output it.
    545  */
    546 pwrite(fd, buf, n)
    547 	int fd;
    548 	char *buf;
    549 	register int n;
    550 {
    551 	register int i;
    552 	register char *bp;
    553 	extern int errno;
    554 
    555 	bp = buf;
    556 	if (bits8 == 0)
    557 		for (i = 0; i < n; i++) {
    558 			*bp = partab[(*bp) & 0177];
    559 			bp++;
    560 		}
    561 	if (write(fd, buf, n) < 0) {
    562 		if (errno == EIO)
    563 			tipabort("Lost carrier.");
    564 		/* this is questionable */
    565 		perror("write");
    566 	}
    567 }
    568 
    569 /*
    570  * Build a parity table with appropriate high-order bit.
    571  */
    572 setparity(defparity)
    573 	char *defparity;
    574 {
    575 	register int i, flip, clr, set;
    576 	char *parity;
    577 	extern unsigned char evenpartab[];
    578 
    579 	if (value(PARITY) == NOSTR)
    580 		value(PARITY) = defparity;
    581 	parity = value(PARITY);
    582 	if (equal(parity, "none")) {
    583 		bits8 = 1;
    584 		return;
    585 	}
    586 	bits8 = 0;
    587 	flip = 0;
    588 	clr = 0377;
    589 	set = 0;
    590 	if (equal(parity, "odd"))
    591 		flip = 0200;			/* reverse bit 7 */
    592 	else if (equal(parity, "zero"))
    593 		clr = 0177;			/* turn off bit 7 */
    594 	else if (equal(parity, "one"))
    595 		set = 0200;			/* turn on bit 7 */
    596 	else if (!equal(parity, "even")) {
    597 		(void) fprintf(stderr, "%s: unknown parity value\r\n", parity);
    598 		(void) fflush(stderr);
    599 	}
    600 	for (i = 0; i < 0200; i++)
    601 		partab[i] = (evenpartab[i] ^ flip | set) & clr;
    602 }
    603