Home | History | Annotate | Line # | Download | only in tip
tip.c revision 1.14.2.1 
      1 /*	$NetBSD: tip.c,v 1.14.2.1 1997/12/17 22:39:59 mellon 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 1.14.2.1 1997/12/17 22:39:59 mellon 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 	int fcarg;
     81 
     82 	gid = getgid();
     83 	egid = getegid();
     84 	uid = getuid();
     85 	euid = geteuid();
     86 	if (equal(sname(argv[0]), "cu")) {
     87 		cumode = 1;
     88 		cumain(argc, argv);
     89 		goto cucommon;
     90 	}
     91 
     92 	if (argc > 4) {
     93 		fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n");
     94 		exit(1);
     95 	}
     96 	if (!isatty(0)) {
     97 		fprintf(stderr, "tip: must be interactive\n");
     98 		exit(1);
     99 	}
    100 
    101 	for (; argc > 1; argv++, argc--) {
    102 		if (argv[1][0] != '-')
    103 			system = argv[1];
    104 		else switch (argv[1][1]) {
    105 
    106 		case 'v':
    107 			vflag++;
    108 			break;
    109 
    110 		case '0': case '1': case '2': case '3': case '4':
    111 		case '5': case '6': case '7': case '8': case '9':
    112 			BR = atoi(&argv[1][1]);
    113 			break;
    114 
    115 		default:
    116 			fprintf(stderr, "tip: %s, unknown option\n", argv[1]);
    117 			break;
    118 		}
    119 	}
    120 
    121 	if (system == NOSTR)
    122 		goto notnumber;
    123 	if (isalpha(*system))
    124 		goto notnumber;
    125 	/*
    126 	 * System name is really a phone number...
    127 	 * Copy the number then stomp on the original (in case the number
    128 	 *	is private, we don't want 'ps' or 'w' to find it).
    129 	 */
    130 	if (strlen(system) > sizeof PNbuf - 1) {
    131 		fprintf(stderr, "tip: phone number too long (max = %d bytes)\n",
    132 			sizeof PNbuf - 1);
    133 		exit(1);
    134 	}
    135 	strncpy( PNbuf, system, sizeof PNbuf - 1 );
    136 	for (p = system; *p; p++)
    137 		*p = '\0';
    138 	PN = PNbuf;
    139 	(void)snprintf(sbuf, sizeof sbuf, "tip%d", BR);
    140 	system = sbuf;
    141 
    142 notnumber:
    143 	(void)signal(SIGINT, cleanup);
    144 	(void)signal(SIGQUIT, cleanup);
    145 	(void)signal(SIGHUP, cleanup);
    146 	(void)signal(SIGTERM, cleanup);
    147 
    148 	if ((i = hunt(system)) == 0) {
    149 		printf("all ports busy\n");
    150 		exit(3);
    151 	}
    152 	if (i == -1) {
    153 		printf("link down\n");
    154 		(void)uu_unlock(uucplock);
    155 		exit(3);
    156 	}
    157 	setbuf(stdout, NULL);
    158 	loginit();
    159 
    160 	/*
    161 	 * Now that we have the logfile and the ACU open
    162 	 *  return to the real uid and gid.  These things will
    163 	 *  be closed on exit.  Swap real and effective uid's
    164 	 *  so we can get the original permissions back
    165 	 *  for removing the uucp lock.
    166 	 */
    167 	user_uid();
    168 
    169 	/*
    170 	 * Kludge, their's no easy way to get the initialization
    171 	 *   in the right order, so force it here
    172 	 */
    173 	if ((PH = getenv("PHONES")) == NOSTR)
    174 		PH = _PATH_PHONES;
    175 	vinit();				/* init variables */
    176 	setparity("even");			/* set the parity table */
    177 	if ((i = speed(number(value(BAUDRATE)))) == 0) {
    178 		printf("tip: bad baud rate %d\n", number(value(BAUDRATE)));
    179 		daemon_uid();
    180 		(void)uu_unlock(uucplock);
    181 		exit(3);
    182 	}
    183 
    184 	/*
    185 	 * Hardwired connections require the
    186 	 *  line speed set before they make any transmissions
    187 	 *  (this is particularly true of things like a DF03-AC)
    188 	 */
    189 	if (HW)
    190 		ttysetup(i);
    191 	if (p = connect()) {
    192 		printf("\07%s\n[EOT]\n", p);
    193 		daemon_uid();
    194 		(void)uu_unlock(uucplock);
    195 		exit(1);
    196 	}
    197 	if (!HW)
    198 		ttysetup(i);
    199 
    200 	/*
    201 	 * Direct connections with no carrier require using O_NONBLOCK on
    202 	 * open, but we don't want to keep O_NONBLOCK after open because it
    203 	 * will cause busy waits.
    204 	 */
    205 	if (DC &&
    206 	    ((fcarg = fcntl(FD, F_GETFL, 0)) < 0 ||
    207 	     fcntl(FD, F_SETFL, fcarg & ~O_NONBLOCK) < 0)) {
    208 		printf("tip: can't clear O_NONBLOCK: %s", strerror (errno));
    209 		daemon_uid();
    210 		(void)uu_unlock (uucplock);
    211 		exit(1);
    212 	}
    213 
    214 cucommon:
    215 	/*
    216 	 * From here down the code is shared with
    217 	 * the "cu" version of tip.
    218 	 */
    219 
    220 	tcgetattr(0, &defterm);
    221 	term = defterm;
    222 	term.c_lflag &= ~(ICANON|IEXTEN|ECHO);
    223 	term.c_iflag &= ~(INPCK|ICRNL);
    224 	term.c_oflag &= ~OPOST;
    225 	term.c_cc[VMIN] = 1;
    226 	term.c_cc[VTIME] = 0;
    227 	defchars = term;
    228 	term.c_cc[VINTR] = term.c_cc[VQUIT] = term.c_cc[VSUSP] =
    229 		term.c_cc[VDSUSP] = term.c_cc[VDISCARD] =
    230 	 	term.c_cc[VLNEXT] = _POSIX_VDISABLE;
    231 	raw();
    232 
    233 	pipe(fildes); pipe(repdes);
    234 	(void)signal(SIGALRM, timeout);
    235 
    236 	/*
    237 	 * Everything's set up now:
    238 	 *	connection established (hardwired or dialup)
    239 	 *	line conditioned (baud rate, mode, etc.)
    240 	 *	internal data structures (variables)
    241 	 * so, fork one process for local side and one for remote.
    242 	 */
    243 	printf(cumode ? "Connected\r\n" : "\07connected\r\n");
    244 	if (pid = fork())
    245 		tipin();
    246 	else
    247 		tipout();
    248 	/*NOTREACHED*/
    249 }
    250 
    251 void
    252 cleanup()
    253 {
    254 
    255 	daemon_uid();
    256 	(void)uu_unlock(uucplock);
    257 	if (odisc)
    258 		ioctl(0, TIOCSETD, (char *)&odisc);
    259 	exit(0);
    260 }
    261 
    262 /*
    263  * Muck with user ID's.  We are setuid to the owner of the lock
    264  * directory when we start.  user_uid() reverses real and effective
    265  * ID's after startup, to run with the user's permissions.
    266  * daemon_uid() switches back to the privileged uid for unlocking.
    267  * Finally, to avoid running a shell with the wrong real uid,
    268  * shell_uid() sets real and effective uid's to the user's real ID.
    269  */
    270 static int uidswapped;
    271 
    272 user_uid()
    273 {
    274 	if (uidswapped == 0) {
    275 		seteuid(uid);
    276 		uidswapped = 1;
    277 	}
    278 }
    279 
    280 daemon_uid()
    281 {
    282 
    283 	if (uidswapped) {
    284 		seteuid(euid);
    285 		uidswapped = 0;
    286 	}
    287 }
    288 
    289 shell_uid()
    290 {
    291 	seteuid(uid);
    292 }
    293 
    294 /*
    295  * put the controlling keyboard into raw mode
    296  */
    297 raw()
    298 {
    299 	tcsetattr(0, TCSADRAIN, &term);
    300 }
    301 
    302 
    303 /*
    304  * return keyboard to normal mode
    305  */
    306 unraw()
    307 {
    308 	tcsetattr(0, TCSADRAIN, &defterm);
    309 }
    310 
    311 static	jmp_buf promptbuf;
    312 
    313 /*
    314  * Print string ``s'', then read a string
    315  *  in from the terminal.  Handles signals & allows use of
    316  *  normal erase and kill characters.
    317  */
    318 prompt(s, p)
    319 	char *s;
    320 	register char *p;
    321 {
    322 	register int c;
    323 	register char *b = p;
    324 	sig_t oint, oquit;
    325 
    326 	stoprompt = 0;
    327 	oint = signal(SIGINT, intprompt);
    328 	oquit = signal(SIGQUIT, SIG_IGN);
    329 	unraw();
    330 	printf("%s", s);
    331 	if (setjmp(promptbuf) == 0)
    332 		while ((c = getchar()) != -1 && (*p = c) != '\n')
    333 			p++;
    334 	*p = '\0';
    335 
    336 	raw();
    337 	(void)signal(SIGINT, oint);
    338 	(void)signal(SIGQUIT, oquit);
    339 	return (stoprompt || p == b);
    340 }
    341 
    342 /*
    343  * Interrupt service routine during prompting
    344  */
    345 void
    346 intprompt()
    347 {
    348 
    349 	(void)signal(SIGINT, SIG_IGN);
    350 	stoprompt = 1;
    351 	printf("\r\n");
    352 	longjmp(promptbuf, 1);
    353 }
    354 
    355 /*
    356  * ****TIPIN   TIPIN****
    357  */
    358 tipin()
    359 {
    360 	char gch, bol = 1;
    361 
    362 	/*
    363 	 * Kinda klugey here...
    364 	 *   check for scripting being turned on from the .tiprc file,
    365 	 *   but be careful about just using setscript(), as we may
    366 	 *   send a SIGEMT before tipout has a chance to set up catching
    367 	 *   it; so wait a second, then setscript()
    368 	 */
    369 	if (boolean(value(SCRIPT))) {
    370 		sleep(1);
    371 		setscript();
    372 	}
    373 
    374 	while (1) {
    375 		gch = getchar()&STRIP_PAR;
    376 		if ((gch == character(value(ESCAPE))) && bol) {
    377 			if (!(gch = escape()))
    378 				continue;
    379 		} else if (!cumode && gch == character(value(RAISECHAR))) {
    380 			setboolean(value(RAISE), !boolean(value(RAISE)));
    381 			continue;
    382 		} else if (gch == '\r') {
    383 			bol = 1;
    384 			pwrite(FD, &gch, 1);
    385 			if (boolean(value(HALFDUPLEX)))
    386 				printf("\r\n");
    387 			continue;
    388 		} else if (!cumode && gch == character(value(FORCE)))
    389 			gch = getchar()&STRIP_PAR;
    390 		bol = any(gch, value(EOL));
    391 		if (boolean(value(RAISE)) && islower(gch))
    392 			gch = toupper(gch);
    393 		pwrite(FD, &gch, 1);
    394 		if (boolean(value(HALFDUPLEX)))
    395 			printf("%c", gch);
    396 	}
    397 }
    398 
    399 extern esctable_t etable[];
    400 
    401 /*
    402  * Escape handler --
    403  *  called on recognition of ``escapec'' at the beginning of a line
    404  */
    405 escape()
    406 {
    407 	register char gch;
    408 	register esctable_t *p;
    409 	char c = character(value(ESCAPE));
    410 
    411 	gch = (getchar()&STRIP_PAR);
    412 	for (p = etable; p->e_char; p++)
    413 		if (p->e_char == gch) {
    414 			if ((p->e_flags&PRIV) && uid)
    415 				continue;
    416 			printf("%s", ctrl(c));
    417 			(*p->e_func)(gch);
    418 			return (0);
    419 		}
    420 	/* ESCAPE ESCAPE forces ESCAPE */
    421 	if (c != gch)
    422 		pwrite(FD, &c, 1);
    423 	return (gch);
    424 }
    425 
    426 speed(n)
    427 	int n;
    428 {
    429 	register int *p;
    430 
    431 	for (p = rates; *p != -1;  p++)
    432 		if (*p == n)
    433 			return n;
    434 	return 0;
    435 }
    436 
    437 any(c, p)
    438 	register char c, *p;
    439 {
    440 	while (p && *p)
    441 		if (*p++ == c)
    442 			return (1);
    443 	return (0);
    444 }
    445 
    446 size(s)
    447 	register char	*s;
    448 {
    449 	register int i = 0;
    450 
    451 	while (s && *s++)
    452 		i++;
    453 	return (i);
    454 }
    455 
    456 char *
    457 interp(s)
    458 	register char *s;
    459 {
    460 	static char buf[256];
    461 	register char *p = buf, c, *q;
    462 
    463 	while (c = *s++) {
    464 		for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
    465 			if (*q++ == c) {
    466 				*p++ = '\\'; *p++ = *q;
    467 				goto next;
    468 			}
    469 		if (c < 040) {
    470 			*p++ = '^'; *p++ = c + 'A'-1;
    471 		} else if (c == 0177) {
    472 			*p++ = '^'; *p++ = '?';
    473 		} else
    474 			*p++ = c;
    475 	next:
    476 		;
    477 	}
    478 	*p = '\0';
    479 	return (buf);
    480 }
    481 
    482 char *
    483 ctrl(c)
    484 	char c;
    485 {
    486 	static char s[3];
    487 
    488 	if (c < 040 || c == 0177) {
    489 		s[0] = '^';
    490 		s[1] = c == 0177 ? '?' : c+'A'-1;
    491 		s[2] = '\0';
    492 	} else {
    493 		s[0] = c;
    494 		s[1] = '\0';
    495 	}
    496 	return (s);
    497 }
    498 
    499 /*
    500  * Help command
    501  */
    502 help(c)
    503 	char c;
    504 {
    505 	register esctable_t *p;
    506 
    507 	printf("%c\r\n", c);
    508 	for (p = etable; p->e_char; p++) {
    509 		if ((p->e_flags&PRIV) && uid)
    510 			continue;
    511 		printf("%2s", ctrl(character(value(ESCAPE))));
    512 		printf("%-2s %c   %s\r\n", ctrl(p->e_char),
    513 			p->e_flags&EXP ? '*': ' ', p->e_help);
    514 	}
    515 }
    516 
    517 /*
    518  * Set up the "remote" tty's state
    519  */
    520 ttysetup(speed)
    521 	int speed;
    522 {
    523 	struct termios	cntrl;
    524 
    525 	tcgetattr(FD, &cntrl);
    526 	cfsetospeed(&cntrl, speed);
    527 	cfsetispeed(&cntrl, speed);
    528 	cntrl.c_cflag &= ~(CSIZE|PARENB);
    529 	cntrl.c_cflag |= CS8;
    530 	if (DC)
    531 		cntrl.c_cflag |= CLOCAL;
    532 	cntrl.c_iflag &= ~(ISTRIP|ICRNL);
    533 	cntrl.c_oflag &= ~OPOST;
    534 	cntrl.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
    535 	cntrl.c_cc[VMIN] = 1;
    536 	cntrl.c_cc[VTIME] = 0;
    537 	if (boolean(value(TAND)))
    538 		cntrl.c_iflag |= IXOFF;
    539 	tcsetattr(FD, TCSAFLUSH, &cntrl);
    540 }
    541 
    542 /*
    543  * Return "simple" name from a file name,
    544  * strip leading directories.
    545  */
    546 char *
    547 sname(s)
    548 	register char *s;
    549 {
    550 	register char *p = s;
    551 
    552 	while (*s)
    553 		if (*s++ == '/')
    554 			p = s;
    555 	return (p);
    556 }
    557 
    558 static char partab[0200];
    559 
    560 /*
    561  * Do a write to the remote machine with the correct parity.
    562  * We are doing 8 bit wide output, so we just generate a character
    563  * with the right parity and output it.
    564  */
    565 pwrite(fd, buf, n)
    566 	int fd;
    567 	char *buf;
    568 	register int n;
    569 {
    570 	register int i;
    571 	register char *bp;
    572 	extern int errno;
    573 
    574 	bp = buf;
    575 	if (bits8 == 0)
    576 		for (i = 0; i < n; i++) {
    577 			*bp = partab[(*bp) & 0177];
    578 			bp++;
    579 		}
    580 	if (write(fd, buf, n) < 0) {
    581 		if (errno == EIO)
    582 			tipabort("Lost carrier.");
    583 		/* this is questionable */
    584 		perror("write");
    585 	}
    586 }
    587 
    588 /*
    589  * Build a parity table with appropriate high-order bit.
    590  */
    591 setparity(defparity)
    592 	char *defparity;
    593 {
    594 	register int i, flip, clr, set;
    595 	char *parity;
    596 	extern unsigned char evenpartab[];
    597 
    598 	if (value(PARITY) == NOSTR)
    599 		value(PARITY) = defparity;
    600 	parity = value(PARITY);
    601 	if (equal(parity, "none")) {
    602 		bits8 = 1;
    603 		return;
    604 	}
    605 	bits8 = 0;
    606 	flip = 0;
    607 	clr = 0377;
    608 	set = 0;
    609 	if (equal(parity, "odd"))
    610 		flip = 0200;			/* reverse bit 7 */
    611 	else if (equal(parity, "zero"))
    612 		clr = 0177;			/* turn off bit 7 */
    613 	else if (equal(parity, "one"))
    614 		set = 0200;			/* turn on bit 7 */
    615 	else if (!equal(parity, "even")) {
    616 		(void) fprintf(stderr, "%s: unknown parity value\r\n", parity);
    617 		(void) fflush(stderr);
    618 	}
    619 	for (i = 0; i < 0200; i++)
    620 		partab[i] = (evenpartab[i] ^ flip | set) & clr;
    621 }
    622