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tip.c revision 1.35 
      1 /*	$NetBSD: tip.c,v 1.35 2006/04/03 00:51:13 perry 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\
     35 	The Regents of the University of California.  All rights reserved.\n");
     36 #endif /* not lint */
     37 
     38 #ifndef lint
     39 #if 0
     40 static char sccsid[] = "@(#)tip.c	8.1 (Berkeley) 6/6/93";
     41 #endif
     42 __RCSID("$NetBSD: tip.c,v 1.35 2006/04/03 00:51:13 perry Exp $");
     43 #endif /* not lint */
     44 
     45 /*
     46  * tip - UNIX link to other systems
     47  *  tip [-v] [-speed] system-name
     48  * or
     49  *  cu phone-number [-s speed] [-l line] [-a acu]
     50  */
     51 #include "tip.h"
     52 #include "pathnames.h"
     53 
     54 int	escape(void);
     55 int	main(int, char **);
     56 void	intprompt(int);
     57 void	tipin(void);
     58 
     59 char	PNbuf[256];			/* This limits the size of a number */
     60 
     61 static char path_phones[] = _PATH_PHONES;
     62 
     63 int
     64 main(int argc, char *argv[])
     65 {
     66 	char *System = NULL;
     67 	int i;
     68 	char *p;
     69 	const char *q;
     70 	char sbuf[12];
     71 	int fcarg;
     72 
     73 	gid = getgid();
     74 	egid = getegid();
     75 	uid = getuid();
     76 	euid = geteuid();
     77 	if (equal(basename(argv[0]), "cu")) {
     78 		cumode = 1;
     79 		cumain(argc, argv);
     80 		goto cucommon;
     81 	}
     82 
     83 	if (argc > 4) {
     84 		fprintf(stderr, "usage: %s [-v] [-speed] [system-name]\n",
     85 		    getprogname());
     86 		exit(1);
     87 	}
     88 	if (!isatty(0)) {
     89 		fprintf(stderr, "%s: must be interactive\n", getprogname());
     90 		exit(1);
     91 	}
     92 
     93 	for (; argc > 1; argv++, argc--) {
     94 		if (argv[1][0] != '-')
     95 			System = argv[1];
     96 		else switch (argv[1][1]) {
     97 
     98 		case 'v':
     99 			vflag++;
    100 			break;
    101 
    102 		case '0': case '1': case '2': case '3': case '4':
    103 		case '5': case '6': case '7': case '8': case '9':
    104 			BR = atoi(&argv[1][1]);
    105 			break;
    106 
    107 		default:
    108 			warnx("%s, unknown option", argv[1]);
    109 			break;
    110 		}
    111 	}
    112 
    113 	if (System == NULL)
    114 		goto notnumber;
    115 	if (isalpha((unsigned char)*System))
    116 		goto notnumber;
    117 	/*
    118 	 * System name is really a phone number...
    119 	 * Copy the number then stomp on the original (in case the number
    120 	 *	is private, we don't want 'ps' or 'w' to find it).
    121 	 */
    122 	if (strlen(System) > sizeof PNbuf - 1) {
    123 		errx(1, "phone number too long (max = %d bytes)",
    124 			(int)sizeof(PNbuf) - 1);
    125 	}
    126 	(void)strlcpy(PNbuf, System, sizeof(PNbuf));
    127 	for (p = System; *p; p++)
    128 		*p = '\0';
    129 	PN = PNbuf;
    130 	(void)snprintf(sbuf, sizeof sbuf, "tip%d", (int)BR);
    131 	System = sbuf;
    132 
    133 notnumber:
    134 	(void)signal(SIGINT, cleanup);
    135 	(void)signal(SIGQUIT, cleanup);
    136 	(void)signal(SIGHUP, cleanup);
    137 	(void)signal(SIGTERM, cleanup);
    138 
    139 	if ((i = hunt(System)) == 0) {
    140 		printf("all ports busy\n");
    141 		exit(3);
    142 	}
    143 	if (i == -1) {
    144 		printf("link down\n");
    145 		(void)uu_unlock(uucplock);
    146 		exit(3);
    147 	}
    148 	setbuf(stdout, NULL);
    149 #ifdef ACULOG
    150 	loginit();
    151 #endif
    152 
    153 	/*
    154 	 * Now that we have the logfile and the ACU open
    155 	 *  return to the real uid and gid.  These things will
    156 	 *  be closed on exit.  Swap real and effective uid's
    157 	 *  so we can get the original permissions back
    158 	 *  for removing the uucp lock.
    159 	 */
    160 	user_uid();
    161 
    162 	/*
    163 	 * Kludge, their's no easy way to get the initialization
    164 	 *   in the right order, so force it here
    165 	 */
    166 	if ((PH = getenv("PHONES")) == NULL)
    167 		PH = path_phones;
    168 	vinit();				/* init variables */
    169 	setparity("none");			/* set the parity table */
    170 
    171 	/*
    172 	 * Hardwired connections require the
    173 	 *  line speed set before they make any transmissions
    174 	 *  (this is particularly true of things like a DF03-AC)
    175 	 */
    176 	if (HW) {
    177 		if (ttysetup(i) != 0) {
    178 			warnx("bad baud rate %d",
    179 			    (int)number(value(BAUDRATE)));
    180 			daemon_uid();
    181 			(void)uu_unlock(uucplock);
    182 			exit(3);
    183 		}
    184 	}
    185 	if ((q = connect()) != NULL) {
    186 		printf("\07%s\n[EOT]\n", q);
    187 		daemon_uid();
    188 		(void)uu_unlock(uucplock);
    189 		exit(1);
    190 	}
    191 	if (!HW) {
    192 		if (ttysetup(i) != 0) {
    193 			warnx("bad baud rate %d",
    194 			    (int)number(value(BAUDRATE)));
    195 			daemon_uid();
    196 			(void)uu_unlock(uucplock);
    197 			exit(3);
    198 		}
    199 	}
    200 
    201 
    202 	/*
    203 	 * Direct connections with no carrier require using O_NONBLOCK on
    204 	 * open, but we don't want to keep O_NONBLOCK after open because it
    205 	 * will cause busy waits.
    206 	 */
    207 	if (DC &&
    208 	    ((fcarg = fcntl(FD, F_GETFL, 0)) < 0 ||
    209 	     fcntl(FD, F_SETFL, fcarg & ~O_NONBLOCK) < 0)) {
    210 		warn("can't clear O_NONBLOCK");
    211 		daemon_uid();
    212 		(void)uu_unlock(uucplock);
    213 		exit(1);
    214 	}
    215 
    216 cucommon:
    217 	/*
    218 	 * From here down the code is shared with
    219 	 * the "cu" version of tip.
    220 	 */
    221 
    222 	tcgetattr(0, &defterm);
    223 	term = defterm;
    224 	term.c_lflag &= ~(ICANON|IEXTEN|ECHO);
    225 	term.c_iflag &= ~(INPCK|ICRNL);
    226 	term.c_oflag &= ~OPOST;
    227 	term.c_cc[VMIN] = 1;
    228 	term.c_cc[VTIME] = 0;
    229 	defchars = term;
    230 	term.c_cc[VINTR] = term.c_cc[VQUIT] = term.c_cc[VSUSP] =
    231 		term.c_cc[VDSUSP] = term.c_cc[VDISCARD] =
    232 	 	term.c_cc[VLNEXT] = _POSIX_VDISABLE;
    233 	raw();
    234 
    235 	pipe(fildes); pipe(repdes);
    236 	(void)signal(SIGALRM, alrmtimeout);
    237 
    238 	/*
    239 	 * Everything's set up now:
    240 	 *	connection established (hardwired or dialup)
    241 	 *	line conditioned (baud rate, mode, etc.)
    242 	 *	internal data structures (variables)
    243 	 * so, fork one process for local side and one for remote.
    244 	 */
    245 	printf("%s", cumode ? "Connected\r\n" : "\07connected\r\n");
    246 	switch (pid = fork()) {
    247 	default:
    248 		tipin();
    249 		break;
    250 	case 0:
    251 		tipout();
    252 		break;
    253 	case -1:
    254 		err(1, "can't fork");
    255 	}
    256 	/*NOTREACHED*/
    257 	exit(0);	/* XXX: pacify gcc */
    258 }
    259 
    260 void
    261 cleanup(int dummy)
    262 {
    263 
    264 	daemon_uid();
    265 	(void)uu_unlock(uucplock);
    266 	if (odisc)
    267 		ioctl(0, TIOCSETD, (char *)&odisc);
    268 	exit(0);
    269 }
    270 
    271 /*
    272  * Muck with user ID's.  We are setuid to the owner of the lock
    273  * directory when we start.  user_uid() reverses real and effective
    274  * ID's after startup, to run with the user's permissions.
    275  * daemon_uid() switches back to the privileged uid for unlocking.
    276  * Finally, to avoid running a shell with the wrong real uid,
    277  * shell_uid() sets real and effective uid's to the user's real ID.
    278  */
    279 static int uidswapped;
    280 
    281 void
    282 user_uid(void)
    283 {
    284 
    285 	if (uidswapped == 0) {
    286 		seteuid(uid);
    287 		uidswapped = 1;
    288 	}
    289 }
    290 
    291 void
    292 daemon_uid(void)
    293 {
    294 
    295 	if (uidswapped) {
    296 		seteuid(euid);
    297 		uidswapped = 0;
    298 	}
    299 }
    300 
    301 void
    302 shell_uid(void)
    303 {
    304 
    305 	seteuid(uid);
    306 }
    307 
    308 /*
    309  * put the controlling keyboard into raw mode
    310  */
    311 void
    312 raw(void)
    313 {
    314 
    315 	tcsetattr(0, TCSADRAIN, &term);
    316 }
    317 
    318 
    319 /*
    320  * return keyboard to normal mode
    321  */
    322 void
    323 unraw(void)
    324 {
    325 
    326 	tcsetattr(0, TCSADRAIN, &defterm);
    327 }
    328 
    329 static	jmp_buf promptbuf;
    330 
    331 /*
    332  * Print string ``s'', then read a string
    333  *  in from the terminal.  Handles signals & allows use of
    334  *  normal erase and kill characters.
    335  */
    336 int
    337 prompt(const char *s, char *p, size_t l)
    338 {
    339 	int c;
    340 	char *b = p;
    341 	sig_t oint, oquit;
    342 
    343 #if __GNUC__		/* XXX: pacify gcc */
    344 	(void)&p;
    345 #endif
    346 
    347 	stoprompt = 0;
    348 	oint = signal(SIGINT, intprompt);
    349 	oquit = signal(SIGQUIT, SIG_IGN);
    350 	unraw();
    351 	printf("%s", s);
    352 	if (setjmp(promptbuf) == 0)
    353 		while ((c = getchar()) != -1 && (*p = c) != '\n' &&
    354 		    b + l > p)
    355 			p++;
    356 	*p = '\0';
    357 
    358 	raw();
    359 	(void)signal(SIGINT, oint);
    360 	(void)signal(SIGQUIT, oquit);
    361 	return (stoprompt || p == b);
    362 }
    363 
    364 /*
    365  * Interrupt service routine during prompting
    366  */
    367 void
    368 intprompt(int dummy)
    369 {
    370 
    371 	(void)signal(SIGINT, SIG_IGN);
    372 	stoprompt = 1;
    373 	printf("\r\n");
    374 	longjmp(promptbuf, 1);
    375 }
    376 
    377 /*
    378  * ****TIPIN   TIPIN****
    379  */
    380 void
    381 tipin(void)
    382 {
    383 	char gch, bol = 1;
    384 
    385 	/*
    386 	 * Kinda klugey here...
    387 	 *   check for scripting being turned on from the .tiprc file,
    388 	 *   but be careful about just using setscript(), as we may
    389 	 *   send a SIGEMT before tipout has a chance to set up catching
    390 	 *   it; so wait a second, then setscript()
    391 	 */
    392 	if (boolean(value(SCRIPT))) {
    393 		sleep(1);
    394 		setscript();
    395 	}
    396 
    397 	while (1) {
    398 		gch = getchar()&STRIP_PAR;
    399 		if ((gch == character(value(ESCAPE))) && bol) {
    400 			if (!(gch = escape()))
    401 				continue;
    402 		} else if (!cumode &&
    403 		    gch && gch == character(value(RAISECHAR))) {
    404 			setboolean(value(RAISE), !boolean(value(RAISE)));
    405 			continue;
    406 		} else if (gch == '\r') {
    407 			bol = 1;
    408 			xpwrite(FD, &gch, 1);
    409 			if (boolean(value(HALFDUPLEX)))
    410 				printf("\r\n");
    411 			continue;
    412 		} else if (!cumode && gch && gch == character(value(FORCE)))
    413 			gch = getchar()&STRIP_PAR;
    414 		bol = any(gch, value(EOL));
    415 		if (boolean(value(RAISE)) && islower((unsigned char)gch))
    416 			gch = toupper((unsigned char)gch);
    417 		xpwrite(FD, &gch, 1);
    418 		if (boolean(value(HALFDUPLEX)))
    419 			printf("%c", gch);
    420 	}
    421 }
    422 
    423 /*
    424  * Escape handler --
    425  *  called on recognition of ``escapec'' at the beginning of a line
    426  */
    427 int
    428 escape(void)
    429 {
    430 	char gch;
    431 	esctable_t *p;
    432 	char c = character(value(ESCAPE));
    433 
    434 	gch = (getchar()&STRIP_PAR);
    435 	for (p = etable; p->e_char; p++)
    436 		if (p->e_char == gch) {
    437 			if ((p->e_flags&PRIV) && uid)
    438 				continue;
    439 			printf("%s", ctrl(c));
    440 			(*p->e_func)(gch);
    441 			return (0);
    442 		}
    443 	/* ESCAPE ESCAPE forces ESCAPE */
    444 	if (c != gch)
    445 		xpwrite(FD, &c, 1);
    446 	return (gch);
    447 }
    448 
    449 int
    450 any(char c, const char *p)
    451 {
    452 
    453 	while (p && *p)
    454 		if (*p++ == c)
    455 			return (1);
    456 	return (0);
    457 }
    458 
    459 char *
    460 interp(const char *s)
    461 {
    462 	static char buf[256];
    463 	char *p = buf, c;
    464 	const char *q;
    465 
    466 	while ((c = *s++) != 0 && buf + sizeof buf - p > 2) {
    467 		for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
    468 			if (*q++ == c) {
    469 				*p++ = '\\'; *p++ = *q;
    470 				goto next;
    471 			}
    472 		if (c < 040) {
    473 			*p++ = '^'; *p++ = c + 'A'-1;
    474 		} else if (c == 0177) {
    475 			*p++ = '^'; *p++ = '?';
    476 		} else
    477 			*p++ = c;
    478 	next:
    479 		;
    480 	}
    481 	*p = '\0';
    482 	return (buf);
    483 }
    484 
    485 char *
    486 ctrl(char c)
    487 {
    488 	static char s[3];
    489 
    490 	if (c < 040 || c == 0177) {
    491 		s[0] = '^';
    492 		s[1] = c == 0177 ? '?' : c+'A'-1;
    493 		s[2] = '\0';
    494 	} else {
    495 		s[0] = c;
    496 		s[1] = '\0';
    497 	}
    498 	return (s);
    499 }
    500 
    501 /*
    502  * Help command
    503  */
    504 void
    505 help(char c)
    506 {
    507 	esctable_t *p;
    508 
    509 	printf("%c\r\n", c);
    510 	for (p = etable; p->e_char; p++) {
    511 		if ((p->e_flags&PRIV) && uid)
    512 			continue;
    513 		printf("%2s", ctrl(character(value(ESCAPE))));
    514 		printf("%-2s %c   %s\r\n", ctrl(p->e_char),
    515 			p->e_flags&EXP ? '*': ' ', p->e_help);
    516 	}
    517 }
    518 
    519 /*
    520  * Set up the "remote" tty's state
    521  */
    522 int
    523 ttysetup(int spd)
    524 {
    525 	struct termios	cntrl;
    526 
    527 	tcgetattr(FD, &cntrl);
    528 	cfsetospeed(&cntrl, spd);
    529 	cfsetispeed(&cntrl, spd);
    530 	cntrl.c_cflag &= ~(CSIZE|PARENB);
    531 	cntrl.c_cflag |= CS8;
    532 	if (DC)
    533 		cntrl.c_cflag |= CLOCAL;
    534 	if (boolean(value(HARDWAREFLOW)))
    535 		cntrl.c_cflag |= CRTSCTS;
    536 	cntrl.c_iflag &= ~(ISTRIP|ICRNL);
    537 	cntrl.c_oflag &= ~OPOST;
    538 	cntrl.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
    539 	cntrl.c_cc[VMIN] = 1;
    540 	cntrl.c_cc[VTIME] = 0;
    541 	if (boolean(value(TAND)))
    542 		cntrl.c_iflag |= IXOFF;
    543 	return(tcsetattr(FD, TCSAFLUSH, &cntrl));
    544 }
    545 
    546 static char partab[0200];
    547 
    548 /*
    549  * Do a write to the remote machine with the correct parity.
    550  * We are doing 8 bit wide output, so we just generate a character
    551  * with the right parity and output it.
    552  */
    553 void
    554 xpwrite(int fd, char *buf, int n)
    555 {
    556 	int i;
    557 	char *bp;
    558 
    559 	bp = buf;
    560 	if (bits8 == 0)
    561 		for (i = 0; i < n; i++) {
    562 			*bp = partab[(*bp) & 0177];
    563 			bp++;
    564 		}
    565 	if (write(fd, buf, n) < 0) {
    566 		if (errno == EIO)
    567 			tipabort("Lost carrier.");
    568 		/* this is questionable */
    569 		warn("write");
    570 	}
    571 }
    572 
    573 /*
    574  * Build a parity table with appropriate high-order bit.
    575  */
    576 void
    577 setparity(const char *defparity)
    578 {
    579 	int i, flip, clr, set;
    580 	const char *parity;
    581 	static char *curpar;
    582 
    583 	if (value(PARITY) == NULL || (value(PARITY))[0] == '\0') {
    584 		if (curpar != NULL)
    585 			free(curpar);
    586 		value(PARITY) = curpar = strdup(defparity);
    587 	}
    588 	parity = value(PARITY);
    589 	if (equal(parity, "none")) {
    590 		bits8 = 1;
    591 		return;
    592 	}
    593 	bits8 = 0;
    594 	flip = 0;
    595 	clr = 0377;
    596 	set = 0;
    597 	if (equal(parity, "odd"))
    598 		flip = 0200;			/* reverse bit 7 */
    599 	else if (equal(parity, "zero"))
    600 		clr = 0177;			/* turn off bit 7 */
    601 	else if (equal(parity, "one"))
    602 		set = 0200;			/* turn on bit 7 */
    603 	else if (!equal(parity, "even")) {
    604 		(void) fprintf(stderr, "%s: unknown parity value\r\n", parity);
    605 		(void) fflush(stderr);
    606 	}
    607 	for (i = 0; i < 0200; i++)
    608 		partab[i] = ((evenpartab[i] ^ flip) | set) & clr;
    609 }
    610