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tip.c revision 1.39 
      1 /*	$NetBSD: tip.c,v 1.39 2006/04/03 04:53:58 christos 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 1.39 2006/04/03 04:53:58 christos 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 		errx(3, "link down\n");
    145 	}
    146 	setbuf(stdout, NULL);
    147 
    148 	/*
    149 	 * Kludge, their's no easy way to get the initialization
    150 	 *   in the right order, so force it here
    151 	 */
    152 	if ((PH = getenv("PHONES")) == NULL)
    153 		PH = path_phones;
    154 	vinit();				/* init variables */
    155 	setparity("none");			/* set the parity table */
    156 
    157 	/*
    158 	 * Hardwired connections require the
    159 	 *  line speed set before they make any transmissions
    160 	 *  (this is particularly true of things like a DF03-AC)
    161 	 */
    162 	if (HW) {
    163 		if (ttysetup((speed_t)i) != 0) {
    164 			errx(3, "bad baud rate %d",
    165 			    (int)number(value(BAUDRATE)));
    166 		}
    167 	}
    168 	if ((q = connect()) != NULL) {
    169 		errx(1, "\07%s\n[EOT]\n", q);
    170 	}
    171 	if (!HW) {
    172 		if (ttysetup((speed_t)i) != 0) {
    173 			errx(3, "bad baud rate %d",
    174 			    (int)number(value(BAUDRATE)));
    175 		}
    176 	}
    177 
    178 
    179 	/*
    180 	 * Direct connections with no carrier require using O_NONBLOCK on
    181 	 * open, but we don't want to keep O_NONBLOCK after open because it
    182 	 * will cause busy waits.
    183 	 */
    184 	if (DC &&
    185 	    ((fcarg = fcntl(FD, F_GETFL, 0)) < 0 ||
    186 	     fcntl(FD, F_SETFL, fcarg & ~O_NONBLOCK) < 0)) {
    187 		err(1, "can't clear O_NONBLOCK");
    188 	}
    189 
    190 cucommon:
    191 	/*
    192 	 * From here down the code is shared with
    193 	 * the "cu" version of tip.
    194 	 */
    195 
    196 	tcgetattr(0, &defterm);
    197 	term = defterm;
    198 	term.c_lflag &= ~(ICANON|IEXTEN|ECHO);
    199 	term.c_iflag &= ~(INPCK|ICRNL);
    200 	term.c_oflag &= ~OPOST;
    201 	term.c_cc[VMIN] = 1;
    202 	term.c_cc[VTIME] = 0;
    203 	defchars = term;
    204 	term.c_cc[VINTR] = term.c_cc[VQUIT] = term.c_cc[VSUSP] =
    205 		term.c_cc[VDSUSP] = term.c_cc[VDISCARD] =
    206 	 	term.c_cc[VLNEXT] = _POSIX_VDISABLE;
    207 	raw();
    208 
    209 	pipe(fildes); pipe(repdes);
    210 	(void)signal(SIGALRM, alrmtimeout);
    211 
    212 	/*
    213 	 * Everything's set up now:
    214 	 *	connection established (hardwired or dialup)
    215 	 *	line conditioned (baud rate, mode, etc.)
    216 	 *	internal data structures (variables)
    217 	 * so, fork one process for local side and one for remote.
    218 	 */
    219 	printf("%s", cumode ? "Connected\r\n" : "\07connected\r\n");
    220 	switch (pid = fork()) {
    221 	default:
    222 		tipin();
    223 		break;
    224 	case 0:
    225 		tipout();
    226 		break;
    227 	case -1:
    228 		err(1, "can't fork");
    229 	}
    230 	/*NOTREACHED*/
    231 	exit(0);	/* XXX: pacify gcc */
    232 }
    233 
    234 void
    235 /*ARGSUSED*/
    236 cleanup(int dummy)
    237 {
    238 
    239 	if (odisc)
    240 		ioctl(0, TIOCSETD, &odisc);
    241 	exit(0);
    242 }
    243 
    244 /*
    245  * put the controlling keyboard into raw mode
    246  */
    247 void
    248 raw(void)
    249 {
    250 
    251 	tcsetattr(0, TCSADRAIN, &term);
    252 }
    253 
    254 
    255 /*
    256  * return keyboard to normal mode
    257  */
    258 void
    259 unraw(void)
    260 {
    261 
    262 	tcsetattr(0, TCSADRAIN, &defterm);
    263 }
    264 
    265 static	jmp_buf promptbuf;
    266 
    267 /*
    268  * Print string ``s'', then read a string
    269  *  in from the terminal.  Handles signals & allows use of
    270  *  normal erase and kill characters.
    271  */
    272 int
    273 prompt(const char *s, char *p, size_t l)
    274 {
    275 	int c;
    276 	char *b = p;
    277 	sig_t oint, oquit;
    278 
    279 #if __GNUC__		/* XXX: pacify gcc */
    280 	(void)&p;
    281 #endif
    282 
    283 	stoprompt = 0;
    284 	oint = signal(SIGINT, intprompt);
    285 	oquit = signal(SIGQUIT, SIG_IGN);
    286 	unraw();
    287 	printf("%s", s);
    288 	if (setjmp(promptbuf) == 0)
    289 		while ((c = getchar()) != -1 && (*p = c) != '\n' &&
    290 		    b + l > p)
    291 			p++;
    292 	*p = '\0';
    293 
    294 	raw();
    295 	(void)signal(SIGINT, oint);
    296 	(void)signal(SIGQUIT, oquit);
    297 	return (stoprompt || p == b);
    298 }
    299 
    300 /*
    301  * Interrupt service routine during prompting
    302  */
    303 void
    304 /*ARGSUSED*/
    305 intprompt(int dummy)
    306 {
    307 
    308 	(void)signal(SIGINT, SIG_IGN);
    309 	stoprompt = 1;
    310 	printf("\r\n");
    311 	longjmp(promptbuf, 1);
    312 }
    313 
    314 /*
    315  * ****TIPIN   TIPIN****
    316  */
    317 void
    318 tipin(void)
    319 {
    320 	char gch, bol = 1;
    321 
    322 	/*
    323 	 * Kinda klugey here...
    324 	 *   check for scripting being turned on from the .tiprc file,
    325 	 *   but be careful about just using setscript(), as we may
    326 	 *   send a SIGEMT before tipout has a chance to set up catching
    327 	 *   it; so wait a second, then setscript()
    328 	 */
    329 	if (boolean(value(SCRIPT))) {
    330 		sleep(1);
    331 		setscript();
    332 	}
    333 
    334 	for (;;) {
    335 		gch = getchar()&STRIP_PAR;
    336 		if ((gch == character(value(ESCAPE))) && bol) {
    337 			if (!(gch = escape()))
    338 				continue;
    339 		} else if (!cumode &&
    340 		    gch && gch == character(value(RAISECHAR))) {
    341 			setboolean(value(RAISE), !boolean(value(RAISE)));
    342 			continue;
    343 		} else if (gch == '\r') {
    344 			bol = 1;
    345 			xpwrite(FD, &gch, 1);
    346 			if (boolean(value(HALFDUPLEX)))
    347 				printf("\r\n");
    348 			continue;
    349 		} else if (!cumode && gch && gch == character(value(FORCE)))
    350 			gch = getchar()&STRIP_PAR;
    351 		bol = any(gch, value(EOL));
    352 		if (boolean(value(RAISE)) && islower((unsigned char)gch))
    353 			gch = toupper((unsigned char)gch);
    354 		xpwrite(FD, &gch, 1);
    355 		if (boolean(value(HALFDUPLEX)))
    356 			printf("%c", gch);
    357 	}
    358 }
    359 
    360 /*
    361  * Escape handler --
    362  *  called on recognition of ``escapec'' at the beginning of a line
    363  */
    364 int
    365 escape(void)
    366 {
    367 	char gch;
    368 	esctable_t *p;
    369 	char c = character(value(ESCAPE));
    370 
    371 	gch = (getchar()&STRIP_PAR);
    372 	for (p = etable; p->e_char; p++)
    373 		if (p->e_char == gch) {
    374 			if ((p->e_flags&PRIV) && uid)
    375 				continue;
    376 			printf("%s", ctrl(c));
    377 			(*p->e_func)(gch);
    378 			return (0);
    379 		}
    380 	/* ESCAPE ESCAPE forces ESCAPE */
    381 	if (c != gch)
    382 		xpwrite(FD, &c, 1);
    383 	return (gch);
    384 }
    385 
    386 int
    387 any(char c, const char *p)
    388 {
    389 
    390 	while (p && *p)
    391 		if (*p++ == c)
    392 			return (1);
    393 	return (0);
    394 }
    395 
    396 char *
    397 interp(const char *s)
    398 {
    399 	static char buf[256];
    400 	char *p = buf, c;
    401 	const char *q;
    402 
    403 	while ((c = *s++) != 0 && buf + sizeof buf - p > 2) {
    404 		for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
    405 			if (*q++ == c) {
    406 				*p++ = '\\'; *p++ = *q;
    407 				goto next;
    408 			}
    409 		if (c < 040) {
    410 			*p++ = '^'; *p++ = c + 'A'-1;
    411 		} else if (c == 0177) {
    412 			*p++ = '^'; *p++ = '?';
    413 		} else
    414 			*p++ = c;
    415 	next:
    416 		;
    417 	}
    418 	*p = '\0';
    419 	return (buf);
    420 }
    421 
    422 char *
    423 ctrl(char c)
    424 {
    425 	static char s[3];
    426 
    427 	if (c < 040 || c == 0177) {
    428 		s[0] = '^';
    429 		s[1] = c == 0177 ? '?' : c+'A'-1;
    430 		s[2] = '\0';
    431 	} else {
    432 		s[0] = c;
    433 		s[1] = '\0';
    434 	}
    435 	return (s);
    436 }
    437 
    438 /*
    439  * Help command
    440  */
    441 void
    442 help(char c)
    443 {
    444 	esctable_t *p;
    445 
    446 	printf("%c\r\n", c);
    447 	for (p = etable; p->e_char; p++) {
    448 		if ((p->e_flags&PRIV) && uid)
    449 			continue;
    450 		printf("%2s", ctrl(character(value(ESCAPE))));
    451 		printf("%-2s %c   %s\r\n", ctrl(p->e_char),
    452 			p->e_flags&EXP ? '*': ' ', p->e_help);
    453 	}
    454 }
    455 
    456 /*
    457  * Set up the "remote" tty's state
    458  */
    459 int
    460 ttysetup(speed_t spd)
    461 {
    462 	struct termios	cntrl;
    463 
    464 	tcgetattr(FD, &cntrl);
    465 	cfsetospeed(&cntrl, spd);
    466 	cfsetispeed(&cntrl, spd);
    467 	cntrl.c_cflag &= ~(CSIZE|PARENB);
    468 	cntrl.c_cflag |= CS8;
    469 	if (DC)
    470 		cntrl.c_cflag |= CLOCAL;
    471 	if (boolean(value(HARDWAREFLOW)))
    472 		cntrl.c_cflag |= CRTSCTS;
    473 	cntrl.c_iflag &= ~(ISTRIP|ICRNL);
    474 	cntrl.c_oflag &= ~OPOST;
    475 	cntrl.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
    476 	cntrl.c_cc[VMIN] = 1;
    477 	cntrl.c_cc[VTIME] = 0;
    478 	if (boolean(value(TAND)))
    479 		cntrl.c_iflag |= IXOFF;
    480 	return(tcsetattr(FD, TCSAFLUSH, &cntrl));
    481 }
    482 
    483 static char partab[0200];
    484 
    485 /*
    486  * Do a write to the remote machine with the correct parity.
    487  * We are doing 8 bit wide output, so we just generate a character
    488  * with the right parity and output it.
    489  */
    490 void
    491 xpwrite(int fd, char *buf, size_t n)
    492 {
    493 	int i;
    494 	char *bp;
    495 
    496 	bp = buf;
    497 	if (bits8 == 0)
    498 		for (i = 0; i < n; i++) {
    499 			*bp = partab[(*bp) & 0177];
    500 			bp++;
    501 		}
    502 	if (write(fd, buf, n) < 0) {
    503 		if (errno == EIO)
    504 			tipabort("Lost carrier.");
    505 		/* this is questionable */
    506 		warn("write");
    507 	}
    508 }
    509 
    510 /*
    511  * Build a parity table with appropriate high-order bit.
    512  */
    513 void
    514 setparity(const char *defparity)
    515 {
    516 	int i, flip, clr, set;
    517 	const char *parity;
    518 	static char *curpar;
    519 
    520 	if (value(PARITY) == NULL || ((char *)value(PARITY))[0] == '\0') {
    521 		if (curpar != NULL)
    522 			free(curpar);
    523 		value(PARITY) = curpar = strdup(defparity);
    524 	}
    525 	parity = value(PARITY);
    526 	if (equal(parity, "none")) {
    527 		bits8 = 1;
    528 		return;
    529 	}
    530 	bits8 = 0;
    531 	flip = 0;
    532 	clr = 0377;
    533 	set = 0;
    534 	if (equal(parity, "odd"))
    535 		flip = 0200;			/* reverse bit 7 */
    536 	else if (equal(parity, "zero"))
    537 		clr = 0177;			/* turn off bit 7 */
    538 	else if (equal(parity, "one"))
    539 		set = 0200;			/* turn on bit 7 */
    540 	else if (!equal(parity, "even")) {
    541 		(void) fprintf(stderr, "%s: unknown parity value\r\n", parity);
    542 		(void) fflush(stderr);
    543 	}
    544 	for (i = 0; i < 0200; i++)
    545 		partab[i] = ((evenpartab[i] ^ flip) | set) & clr;
    546 }
    547