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tip.c revision 1.53 
      1 /*	$NetBSD: tip.c,v 1.53 2013/10/21 14:47:46 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 #include <ctype.h>
     34 #include <libgen.h>
     35 
     36 #ifndef lint
     37 __COPYRIGHT("@(#) Copyright (c) 1983, 1993\
     38  The Regents of the University of California.  All rights reserved.");
     39 #endif /* not lint */
     40 
     41 #ifndef lint
     42 #if 0
     43 static char sccsid[] = "@(#)tip.c	8.1 (Berkeley) 6/6/93";
     44 #endif
     45 __RCSID("$NetBSD: tip.c,v 1.53 2013/10/21 14:47:46 christos Exp $");
     46 #endif /* not lint */
     47 
     48 /*
     49  * tip - UNIX link to other systems
     50  *  tip [-v] [-speed] system-name
     51  * or
     52  *  cu [options] [phone-number|"dir"]
     53  */
     54 #include "tip.h"
     55 #include "pathnames.h"
     56 
     57 __dead static void	tipusage(void);
     58 
     59 int	escape(void);
     60 int	main(int, char **);
     61 __dead static void	intprompt(int);
     62 __dead static void	tipin(void);
     63 
     64 char	PNbuf[256];			/* This limits the size of a number */
     65 
     66 static char path_phones[] = _PATH_PHONES;
     67 
     68 int
     69 main(int argc, char *argv[])
     70 {
     71 	char *System = NULL;
     72 	int c, i;
     73 	char *p;
     74 	const char *q;
     75 	char sbuf[12];
     76 	static char brbuf[16];
     77 	int fcarg;
     78 
     79 	setprogname(argv[0]);
     80 	gid = getgid();
     81 	egid = getegid();
     82 	uid = getuid();
     83 	euid = geteuid();
     84 	if (strcmp(getprogname(), "cu") == 0) {
     85 		cumode = 1;
     86 		cumain(argc, argv);
     87 		goto cucommon;
     88 	}
     89 
     90 	if (argc > 4) {
     91 		tipusage();
     92 	}
     93 	if (!isatty(0)) {
     94 		(void)fprintf(stderr, "%s: must be interactive\n", getprogname());
     95 		exit(1);
     96 	}
     97 
     98 	while((c = getopt(argc, argv, "v0123456789")) != -1) {
     99 		switch(c) {
    100 
    101 		case 'v':
    102 			vflag++;
    103 			break;
    104 
    105 		case '0': case '1': case '2': case '3': case '4':
    106 		case '5': case '6': case '7': case '8': case '9':
    107 			(void)snprintf(brbuf, sizeof(brbuf) -1, "%s%c", brbuf, c);
    108 			BR = atoi(brbuf);
    109 			break;
    110 
    111 		default:
    112 			warnx("%s, unknown option", argv[1]);
    113 			break;
    114 		}
    115 	}
    116 
    117 	argc -= optind;
    118 	argv += optind;
    119 
    120 	if (argc != 1)
    121 		tipusage();
    122 	else
    123 		System = argv[0];
    124 
    125 
    126 	if (System == NULL)
    127 		goto notnumber;
    128 	if (isalpha((unsigned char)*System))
    129 		goto notnumber;
    130 	/*
    131 	 * System name is really a phone number...
    132 	 * Copy the number then stomp on the original (in case the number
    133 	 *	is private, we don't want 'ps' or 'w' to find it).
    134 	 */
    135 	if (strlen(System) > sizeof PNbuf - 1) {
    136 		errx(1, "phone number too long (max = %d bytes)",
    137 			(int)sizeof(PNbuf) - 1);
    138 	}
    139 	(void)strlcpy(PNbuf, System, sizeof(PNbuf));
    140 	for (p = System; *p; p++)
    141 		*p = '\0';
    142 	PN = PNbuf;
    143 	(void)snprintf(sbuf, sizeof sbuf, "tip%d", (int)BR);
    144 	System = sbuf;
    145 
    146 notnumber:
    147 	(void)signal(SIGINT, cleanup);
    148 	(void)signal(SIGQUIT, cleanup);
    149 	(void)signal(SIGHUP, cleanup);
    150 	(void)signal(SIGTERM, cleanup);
    151 
    152 	if ((i = hunt(System)) == 0) {
    153 		(void)printf("all ports busy\n");
    154 		exit(3);
    155 	}
    156 	if (i == -1) {
    157 		errx(3, "link down\n");
    158 	}
    159 	setbuf(stdout, NULL);
    160 
    161 	/*
    162 	 * Kludge, their's no easy way to get the initialization
    163 	 *   in the right order, so force it here
    164 	 */
    165 	if ((PH = getenv("PHONES")) == NULL)
    166 		PH = path_phones;
    167 	vinit();				/* init variables */
    168 	setparity("none");			/* set the parity table */
    169 
    170 	/*
    171 	 * Hardwired connections require the
    172 	 *  line speed set before they make any transmissions
    173 	 *  (this is particularly true of things like a DF03-AC)
    174 	 */
    175 	if (HW) {
    176 		if (ttysetup((speed_t)number(value(BAUDRATE))) != 0) {
    177 			errx(3, "bad baud rate %d",
    178 			    (int)number(value(BAUDRATE)));
    179 		}
    180 	}
    181 	if ((q = tip_connect()) != NULL) {
    182 		errx(1, "\07%s\n[EOT]\n", q);
    183 	}
    184 	if (!HW) {
    185 		if (ttysetup((speed_t)number(value(BAUDRATE))) != 0) {
    186 			errx(3, "bad baud rate %d",
    187 			    (int)number(value(BAUDRATE)));
    188 		}
    189 	}
    190 
    191 
    192 cucommon:
    193 	/*
    194 	 * From here down the code is shared with
    195 	 * the "cu" version of tip.
    196 	 */
    197 
    198 	/*
    199 	 * Direct connections with no carrier require using O_NONBLOCK on
    200 	 * open, but we don't want to keep O_NONBLOCK after open because it
    201 	 * will cause busy waits.
    202 	 */
    203 	if (DC &&
    204 	    ((fcarg = fcntl(FD, F_GETFL, 0)) < 0 ||
    205 	     fcntl(FD, F_SETFL, fcarg & ~O_NONBLOCK) < 0)) {
    206 		err(1, "can't clear O_NONBLOCK");
    207 	}
    208 
    209 	(void)tcgetattr(0, &defterm);
    210 	term = defterm;
    211 	term.c_lflag &= ~(ICANON|IEXTEN|ECHO);
    212 	term.c_iflag &= ~(INPCK|ICRNL);
    213 	term.c_oflag &= ~OPOST;
    214 	term.c_cc[VMIN] = 1;
    215 	term.c_cc[VTIME] = 0;
    216 	defchars = term;
    217 	term.c_cc[VINTR] = term.c_cc[VQUIT] = term.c_cc[VSUSP] =
    218 		term.c_cc[VDSUSP] = term.c_cc[VDISCARD] =
    219 	 	term.c_cc[VLNEXT] = _POSIX_VDISABLE;
    220 	raw();
    221 
    222 	(void)pipe(attndes);
    223 	(void)pipe(fildes);
    224 	(void)pipe(repdes);
    225 	(void)signal(SIGALRM, alrmtimeout);
    226 
    227 	/*
    228 	 * Everything's set up now:
    229 	 *	connection established (hardwired or dialup)
    230 	 *	line conditioned (baud rate, mode, etc.)
    231 	 *	internal data structures (variables)
    232 	 * so, fork one process for local side and one for remote.
    233 	 */
    234 	(void)printf("%s", cumode ? "Connected\r\n" : "\07connected\r\n");
    235 	switch (pid = fork()) {
    236 	default:
    237 		tipin();
    238 		break;
    239 	case 0:
    240 		tipout();
    241 		break;
    242 	case -1:
    243 		err(1, "can't fork");
    244 	}
    245 	/*NOTREACHED*/
    246 	exit(0);	/* XXX: pacify gcc */
    247 }
    248 
    249 void
    250 tipusage(void)
    251 {
    252 	(void)fprintf(stderr, "usage: %s [-v] [-speed] system-name\n",
    253 	    getprogname());
    254 	(void)fprintf(stderr, "       %s [-v] [-speed] phone-number\n",
    255 	    getprogname());
    256 	exit(1);
    257 }
    258 
    259 void
    260 /*ARGSUSED*/
    261 cleanup(int dummy __unused)
    262 {
    263 
    264 	if (odisc)
    265 		(void)ioctl(0, TIOCSETD, &odisc);
    266 	exit(0);
    267 }
    268 
    269 /*
    270  * put the controlling keyboard into raw mode
    271  */
    272 void
    273 raw(void)
    274 {
    275 
    276 	(void)tcsetattr(0, TCSADRAIN, &term);
    277 }
    278 
    279 
    280 /*
    281  * return keyboard to normal mode
    282  */
    283 void
    284 unraw(void)
    285 {
    286 
    287 	(void)tcsetattr(0, TCSADRAIN, &defterm);
    288 }
    289 
    290 static	jmp_buf promptbuf;
    291 
    292 /*
    293  * Print string ``s'', then read a string
    294  *  in from the terminal.  Handles signals & allows use of
    295  *  normal erase and kill characters.
    296  */
    297 int
    298 prompt(const char *s, char *volatile p, size_t l)
    299 {
    300 	int c;
    301 	char *b = p;
    302 	sig_t oint, oquit;
    303 
    304 	stoprompt = 0;
    305 	oint = signal(SIGINT, intprompt);
    306 	oquit = signal(SIGQUIT, SIG_IGN);
    307 	unraw();
    308 	(void)printf("%s", s);
    309 	if (setjmp(promptbuf) == 0)
    310 		while ((c = getchar()) != -1 && (*p = c) != '\n' &&
    311 		    b + l > p)
    312 			p++;
    313 	*p = '\0';
    314 
    315 	raw();
    316 	(void)signal(SIGINT, oint);
    317 	(void)signal(SIGQUIT, oquit);
    318 	return (stoprompt || p == b);
    319 }
    320 
    321 /*
    322  * Interrupt service routine during prompting
    323  */
    324 static void
    325 /*ARGSUSED*/
    326 intprompt(int dummy __unused)
    327 {
    328 
    329 	(void)signal(SIGINT, SIG_IGN);
    330 	stoprompt = 1;
    331 	(void)printf("\r\n");
    332 	longjmp(promptbuf, 1);
    333 }
    334 
    335 /*
    336  * ****TIPIN   TIPIN****
    337  */
    338 static void
    339 tipin(void)
    340 {
    341 	char gch, bol = 1;
    342 
    343 	/*
    344 	 * Kinda klugey here...
    345 	 *   check for scripting being turned on from the .tiprc file,
    346 	 *   but be careful about just using setscript(), as we may
    347 	 *   send a SIGEMT before tipout has a chance to set up catching
    348 	 *   it; so wait a second, then setscript()
    349 	 */
    350 	if (boolean(value(SCRIPT))) {
    351 		(void)sleep(1);
    352 		setscript();
    353 	}
    354 
    355 	for (;;) {
    356 		gch = getchar()&STRIP_PAR;
    357 		if ((gch == character(value(ESCAPE))) && bol) {
    358 			if (!(gch = escape()))
    359 				continue;
    360 		} else if (!cumode &&
    361 		    gch && gch == character(value(RAISECHAR))) {
    362 			setboolean(value(RAISE), !boolean(value(RAISE)));
    363 			continue;
    364 		} else if (gch == '\r') {
    365 			bol = 1;
    366 			xpwrite(FD, &gch, 1);
    367 			if (boolean(value(HALFDUPLEX)))
    368 				(void)printf("\r\n");
    369 			continue;
    370 		} else if (!cumode && gch && gch == character(value(FORCE)))
    371 			gch = getchar()&STRIP_PAR;
    372 		bol = any(gch, value(EOL));
    373 		if (boolean(value(RAISE)) && islower((unsigned char)gch))
    374 			gch = toupper((unsigned char)gch);
    375 		xpwrite(FD, &gch, 1);
    376 		if (boolean(value(HALFDUPLEX)))
    377 			(void)printf("%c", gch);
    378 	}
    379 }
    380 
    381 /*
    382  * Escape handler --
    383  *  called on recognition of ``escapec'' at the beginning of a line
    384  */
    385 int
    386 escape(void)
    387 {
    388 	char gch;
    389 	esctable_t *p;
    390 	char c = character(value(ESCAPE));
    391 
    392 	gch = (getchar()&STRIP_PAR);
    393 	for (p = etable; p->e_char; p++)
    394 		if (p->e_char == gch) {
    395 			if ((p->e_flags&PRIV) && uid)
    396 				continue;
    397 			(void)printf("%s", ctrl(c));
    398 			(*p->e_func)(gch);
    399 			return (0);
    400 		}
    401 	/* ESCAPE ESCAPE forces ESCAPE */
    402 	if (c != gch)
    403 		xpwrite(FD, &c, 1);
    404 	return (gch);
    405 }
    406 
    407 int
    408 any(char c, const char *p)
    409 {
    410 
    411 	while (p && *p)
    412 		if (*p++ == c)
    413 			return (1);
    414 	return (0);
    415 }
    416 
    417 char *
    418 interp(const char *s)
    419 {
    420 	static char buf[256];
    421 	char *p = buf, c;
    422 	const char *q;
    423 
    424 	while ((c = *s++) != 0 && buf + sizeof buf - p > 2) {
    425 		for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
    426 			if (*q++ == c) {
    427 				*p++ = '\\'; *p++ = *q;
    428 				goto next;
    429 			}
    430 		if (c < 040) {
    431 			*p++ = '^'; *p++ = c + 'A'-1;
    432 		} else if (c == 0177) {
    433 			*p++ = '^'; *p++ = '?';
    434 		} else
    435 			*p++ = c;
    436 	next:
    437 		;
    438 	}
    439 	*p = '\0';
    440 	return (buf);
    441 }
    442 
    443 char *
    444 ctrl(char c)
    445 {
    446 	static char s[3];
    447 
    448 	if (c < 040 || c == 0177) {
    449 		s[0] = '^';
    450 		s[1] = c == 0177 ? '?' : c+'A'-1;
    451 		s[2] = '\0';
    452 	} else {
    453 		s[0] = c;
    454 		s[1] = '\0';
    455 	}
    456 	return (s);
    457 }
    458 
    459 /*
    460  * Help command
    461  */
    462 void
    463 help(char c)
    464 {
    465 	esctable_t *p;
    466 
    467 	(void)printf("%c\r\n", c);
    468 	for (p = etable; p->e_char; p++) {
    469 		if ((p->e_flags&PRIV) && uid)
    470 			continue;
    471 		(void)printf("%2s", ctrl(character(value(ESCAPE))));
    472 		(void)printf("%-2s %c   %s\r\n", ctrl(p->e_char),
    473 			p->e_flags&EXP ? '*': ' ', p->e_help);
    474 	}
    475 }
    476 
    477 /*
    478  * Set up the "remote" tty's state
    479  */
    480 int
    481 ttysetup(speed_t spd)
    482 {
    483 	struct termios	cntrl;
    484 
    485 	(void)tcgetattr(FD, &cntrl);
    486 	(void)cfsetospeed(&cntrl, spd);
    487 	(void)cfsetispeed(&cntrl, spd);
    488 	cntrl.c_cflag &= ~(CSIZE|PARENB);
    489 	cntrl.c_cflag |= CS8;
    490 	if (DC)
    491 		cntrl.c_cflag |= CLOCAL;
    492 	if (boolean(value(HARDWAREFLOW)))
    493 		cntrl.c_cflag |= CRTSCTS;
    494 	cntrl.c_iflag &= ~(ISTRIP|ICRNL);
    495 	cntrl.c_oflag &= ~OPOST;
    496 	cntrl.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
    497 	cntrl.c_cc[VMIN] = 1;
    498 	cntrl.c_cc[VTIME] = 0;
    499 	if (boolean(value(TAND)))
    500 		cntrl.c_iflag |= IXOFF|IXON|IXANY;
    501 	else
    502 		cntrl.c_iflag &= ~(IXOFF|IXON|IXANY);
    503 	return tcsetattr(FD, TCSAFLUSH, &cntrl);
    504 }
    505 
    506 static char partab[0200];
    507 
    508 /*
    509  * Do a write to the remote machine with the correct parity.
    510  * We are doing 8 bit wide output, so we just generate a character
    511  * with the right parity and output it.
    512  */
    513 void
    514 xpwrite(int fd, char *buf, size_t n)
    515 {
    516 	size_t i;
    517 	char *bp;
    518 
    519 	bp = buf;
    520 	if (bits8 == 0)
    521 		for (i = 0; i < n; i++) {
    522 			*bp = partab[(*bp) & 0177];
    523 			bp++;
    524 		}
    525 	if (write(fd, buf, n) < 0) {
    526 		if (errno == EIO)
    527 			tipabort("Lost carrier.");
    528 		/* this is questionable */
    529 		warn("write");
    530 	}
    531 }
    532 
    533 /*
    534  * Build a parity table with appropriate high-order bit.
    535  */
    536 void
    537 setparity(const char *defparity)
    538 {
    539 	int i, flip, clr, set;
    540 	const char *parity;
    541 	static char *curpar;
    542 
    543 	if (value(PARITY) == NULL || ((char *)value(PARITY))[0] == '\0') {
    544 		if (curpar != NULL)
    545 			free(curpar);
    546 		value(PARITY) = curpar = strdup(defparity);
    547 	}
    548 	parity = value(PARITY);
    549 	if (strcmp(parity, "none") == 0) {
    550 		bits8 = 1;
    551 		return;
    552 	}
    553 	bits8 = 0;
    554 	flip = 0;
    555 	clr = 0377;
    556 	set = 0;
    557 	if (strcmp(parity, "odd") == 0)
    558 		flip = 0200;			/* reverse bit 7 */
    559 	else if (strcmp(parity, "zero") == 0)
    560 		clr = 0177;			/* turn off bit 7 */
    561 	else if (strcmp(parity, "one") == 0)
    562 		set = 0200;			/* turn on bit 7 */
    563 	else if (strcmp(parity, "even") != 0) {
    564 		(void)fprintf(stderr, "%s: unknown parity value\r\n", parity);
    565 		(void)fflush(stderr);
    566 	}
    567 	for (i = 0; i < 0200; i++)
    568 		partab[i] = ((evenpartab[i] ^ flip) | set) & clr;
    569 }
    570