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tip.c revision 1.55 
      1 /*	$NetBSD: tip.c,v 1.55 2014/07/27 04:32:23 dholland 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 1.55 2014/07/27 04:32:23 dholland 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 	int cmdlineBR;
     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 	cmdlineBR = 0;
     99 	while((c = getopt(argc, argv, "v0123456789")) != -1) {
    100 		switch(c) {
    101 
    102 		case 'v':
    103 			vflag++;
    104 			break;
    105 
    106 		case '0': case '1': case '2': case '3': case '4':
    107 		case '5': case '6': case '7': case '8': case '9':
    108 			cmdlineBR = cmdlineBR * 10 + (c - '0');
    109 			BR = cmdlineBR;
    110 			break;
    111 
    112 		default:
    113 			warnx("%s, unknown option", argv[1]);
    114 			break;
    115 		}
    116 	}
    117 
    118 	argc -= optind;
    119 	argv += optind;
    120 
    121 	if (argc != 1)
    122 		tipusage();
    123 	else
    124 		System = argv[0];
    125 
    126 
    127 	if (System == NULL)
    128 		goto notnumber;
    129 	if (isalpha((unsigned char)*System))
    130 		goto notnumber;
    131 	/*
    132 	 * System name is really a phone number...
    133 	 * Copy the number then stomp on the original (in case the number
    134 	 *	is private, we don't want 'ps' or 'w' to find it).
    135 	 */
    136 	if (strlen(System) > sizeof PNbuf - 1) {
    137 		errx(1, "phone number too long (max = %d bytes)",
    138 			(int)sizeof(PNbuf) - 1);
    139 	}
    140 	(void)strlcpy(PNbuf, System, sizeof(PNbuf));
    141 	for (p = System; *p; p++)
    142 		*p = '\0';
    143 	PN = PNbuf;
    144 	(void)snprintf(sbuf, sizeof sbuf, "tip%d", (int)BR);
    145 	System = sbuf;
    146 
    147 notnumber:
    148 	(void)signal(SIGINT, cleanup);
    149 	(void)signal(SIGQUIT, cleanup);
    150 	(void)signal(SIGHUP, cleanup);
    151 	(void)signal(SIGTERM, cleanup);
    152 
    153 	if ((i = hunt(System)) == 0) {
    154 		(void)printf("all ports busy\n");
    155 		exit(3);
    156 	}
    157 	if (i == -1) {
    158 		errx(3, "link down\n");
    159 	}
    160 	setbuf(stdout, NULL);
    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((speed_t)number(value(BAUDRATE))) != 0) {
    178 			errx(3, "bad baud rate %d",
    179 			    (int)number(value(BAUDRATE)));
    180 		}
    181 	}
    182 	if ((q = tip_connect()) != NULL) {
    183 		errx(1, "\07%s\n[EOT]\n", q);
    184 	}
    185 	if (!HW) {
    186 		if (ttysetup((speed_t)number(value(BAUDRATE))) != 0) {
    187 			errx(3, "bad baud rate %d",
    188 			    (int)number(value(BAUDRATE)));
    189 		}
    190 	}
    191 
    192 
    193 cucommon:
    194 	/*
    195 	 * From here down the code is shared with
    196 	 * the "cu" version of tip.
    197 	 */
    198 
    199 	/*
    200 	 * Direct connections with no carrier require using O_NONBLOCK on
    201 	 * open, but we don't want to keep O_NONBLOCK after open because it
    202 	 * will cause busy waits.
    203 	 */
    204 	if (DC &&
    205 	    ((fcarg = fcntl(FD, F_GETFL, 0)) < 0 ||
    206 	     fcntl(FD, F_SETFL, fcarg & ~O_NONBLOCK) < 0)) {
    207 		err(1, "can't clear O_NONBLOCK");
    208 	}
    209 
    210 	(void)tcgetattr(0, &defterm);
    211 	term = defterm;
    212 	term.c_lflag &= ~(ICANON|IEXTEN|ECHO);
    213 	term.c_iflag &= ~(INPCK|ICRNL);
    214 	term.c_oflag &= ~OPOST;
    215 	term.c_cc[VMIN] = 1;
    216 	term.c_cc[VTIME] = 0;
    217 	defchars = term;
    218 	term.c_cc[VINTR] = term.c_cc[VQUIT] = term.c_cc[VSUSP] =
    219 		term.c_cc[VDSUSP] = term.c_cc[VDISCARD] =
    220 	 	term.c_cc[VLNEXT] = _POSIX_VDISABLE;
    221 	raw();
    222 
    223 	(void)pipe(attndes);
    224 	(void)pipe(fildes);
    225 	(void)pipe(repdes);
    226 	(void)signal(SIGALRM, alrmtimeout);
    227 
    228 	/*
    229 	 * Everything's set up now:
    230 	 *	connection established (hardwired or dialup)
    231 	 *	line conditioned (baud rate, mode, etc.)
    232 	 *	internal data structures (variables)
    233 	 * so, fork one process for local side and one for remote.
    234 	 */
    235 	(void)printf("%s", cumode ? "Connected\r\n" : "\07connected\r\n");
    236 	switch (pid = fork()) {
    237 	default:
    238 		tipin();
    239 		break;
    240 	case 0:
    241 		tipout();
    242 		break;
    243 	case -1:
    244 		err(1, "can't fork");
    245 	}
    246 	/*NOTREACHED*/
    247 	exit(0);	/* XXX: pacify gcc */
    248 }
    249 
    250 void
    251 tipusage(void)
    252 {
    253 	(void)fprintf(stderr, "usage: %s [-v] [-speed] system-name\n",
    254 	    getprogname());
    255 	(void)fprintf(stderr, "       %s [-v] [-speed] phone-number\n",
    256 	    getprogname());
    257 	exit(1);
    258 }
    259 
    260 void
    261 /*ARGSUSED*/
    262 cleanup(int dummy __unused)
    263 {
    264 
    265 	if (odisc)
    266 		(void)ioctl(0, TIOCSETD, &odisc);
    267 	exit(0);
    268 }
    269 
    270 /*
    271  * put the controlling keyboard into raw mode
    272  */
    273 void
    274 raw(void)
    275 {
    276 
    277 	(void)tcsetattr(0, TCSADRAIN, &term);
    278 }
    279 
    280 
    281 /*
    282  * return keyboard to normal mode
    283  */
    284 void
    285 unraw(void)
    286 {
    287 
    288 	(void)tcsetattr(0, TCSADRAIN, &defterm);
    289 }
    290 
    291 static	jmp_buf promptbuf;
    292 
    293 /*
    294  * Print string ``s'', then read a string
    295  *  in from the terminal.  Handles signals & allows use of
    296  *  normal erase and kill characters.
    297  */
    298 int
    299 prompt(const char *s, char *volatile p, size_t l)
    300 {
    301 	int c;
    302 	char *b = p;
    303 	sig_t oint, oquit;
    304 
    305 	stoprompt = 0;
    306 	oint = signal(SIGINT, intprompt);
    307 	oquit = signal(SIGQUIT, SIG_IGN);
    308 	unraw();
    309 	(void)printf("%s", s);
    310 	if (setjmp(promptbuf) == 0)
    311 		while ((c = getchar()) != -1 && (*p = c) != '\n' &&
    312 		    b + l > p)
    313 			p++;
    314 	*p = '\0';
    315 
    316 	raw();
    317 	(void)signal(SIGINT, oint);
    318 	(void)signal(SIGQUIT, oquit);
    319 	return (stoprompt || p == b);
    320 }
    321 
    322 /*
    323  * Interrupt service routine during prompting
    324  */
    325 static void
    326 /*ARGSUSED*/
    327 intprompt(int dummy __unused)
    328 {
    329 
    330 	(void)signal(SIGINT, SIG_IGN);
    331 	stoprompt = 1;
    332 	(void)printf("\r\n");
    333 	longjmp(promptbuf, 1);
    334 }
    335 
    336 /*
    337  * ****TIPIN   TIPIN****
    338  */
    339 static void
    340 tipin(void)
    341 {
    342 	char gch, bol = 1;
    343 
    344 	/*
    345 	 * Kinda klugey here...
    346 	 *   check for scripting being turned on from the .tiprc file,
    347 	 *   but be careful about just using setscript(), as we may
    348 	 *   send a SIGEMT before tipout has a chance to set up catching
    349 	 *   it; so wait a second, then setscript()
    350 	 */
    351 	if (boolean(value(SCRIPT))) {
    352 		(void)sleep(1);
    353 		setscript();
    354 	}
    355 
    356 	for (;;) {
    357 		gch = getchar()&STRIP_PAR;
    358 		if ((gch == character(value(ESCAPE))) && bol) {
    359 			if (!(gch = escape()))
    360 				continue;
    361 		} else if (!cumode &&
    362 		    gch && gch == character(value(RAISECHAR))) {
    363 			setboolean(value(RAISE), !boolean(value(RAISE)));
    364 			continue;
    365 		} else if (gch == '\r') {
    366 			bol = 1;
    367 			xpwrite(FD, &gch, 1);
    368 			if (boolean(value(HALFDUPLEX)))
    369 				(void)printf("\r\n");
    370 			continue;
    371 		} else if (!cumode && gch && gch == character(value(FORCE)))
    372 			gch = getchar()&STRIP_PAR;
    373 		bol = any(gch, value(EOL));
    374 		if (boolean(value(RAISE)) && islower((unsigned char)gch))
    375 			gch = toupper((unsigned char)gch);
    376 		xpwrite(FD, &gch, 1);
    377 		if (boolean(value(HALFDUPLEX)))
    378 			(void)printf("%c", gch);
    379 	}
    380 }
    381 
    382 /*
    383  * Escape handler --
    384  *  called on recognition of ``escapec'' at the beginning of a line
    385  */
    386 int
    387 escape(void)
    388 {
    389 	char gch;
    390 	esctable_t *p;
    391 	char c = character(value(ESCAPE));
    392 
    393 	gch = (getchar()&STRIP_PAR);
    394 	for (p = etable; p->e_char; p++)
    395 		if (p->e_char == gch) {
    396 			if ((p->e_flags&PRIV) && uid)
    397 				continue;
    398 			(void)printf("%s", ctrl(c));
    399 			(*p->e_func)(gch);
    400 			return (0);
    401 		}
    402 	/* ESCAPE ESCAPE forces ESCAPE */
    403 	if (c != gch)
    404 		xpwrite(FD, &c, 1);
    405 	return (gch);
    406 }
    407 
    408 int
    409 any(char c, const char *p)
    410 {
    411 
    412 	while (p && *p)
    413 		if (*p++ == c)
    414 			return (1);
    415 	return (0);
    416 }
    417 
    418 char *
    419 interp(const char *s)
    420 {
    421 	static char buf[256];
    422 	char *p = buf, c;
    423 	const char *q;
    424 
    425 	while ((c = *s++) != 0 && buf + sizeof buf - p > 2) {
    426 		for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
    427 			if (*q++ == c) {
    428 				*p++ = '\\'; *p++ = *q;
    429 				goto next;
    430 			}
    431 		if (c < 040) {
    432 			*p++ = '^'; *p++ = c + 'A'-1;
    433 		} else if (c == 0177) {
    434 			*p++ = '^'; *p++ = '?';
    435 		} else
    436 			*p++ = c;
    437 	next:
    438 		;
    439 	}
    440 	*p = '\0';
    441 	return (buf);
    442 }
    443 
    444 char *
    445 ctrl(char c)
    446 {
    447 	static char s[3];
    448 
    449 	if (c < 040 || c == 0177) {
    450 		s[0] = '^';
    451 		s[1] = c == 0177 ? '?' : c+'A'-1;
    452 		s[2] = '\0';
    453 	} else {
    454 		s[0] = c;
    455 		s[1] = '\0';
    456 	}
    457 	return (s);
    458 }
    459 
    460 /*
    461  * Help command
    462  */
    463 void
    464 help(char c)
    465 {
    466 	esctable_t *p;
    467 
    468 	(void)printf("%c\r\n", c);
    469 	for (p = etable; p->e_char; p++) {
    470 		if ((p->e_flags&PRIV) && uid)
    471 			continue;
    472 		(void)printf("%2s", ctrl(character(value(ESCAPE))));
    473 		(void)printf("%-2s %c   %s\r\n", ctrl(p->e_char),
    474 			p->e_flags&EXP ? '*': ' ', p->e_help);
    475 	}
    476 }
    477 
    478 /*
    479  * Set up the "remote" tty's state
    480  */
    481 int
    482 ttysetup(speed_t spd)
    483 {
    484 	struct termios	cntrl;
    485 
    486 	(void)tcgetattr(FD, &cntrl);
    487 	(void)cfsetospeed(&cntrl, spd);
    488 	(void)cfsetispeed(&cntrl, spd);
    489 	cntrl.c_cflag &= ~(CSIZE|PARENB);
    490 	cntrl.c_cflag |= CS8;
    491 	if (DC)
    492 		cntrl.c_cflag |= CLOCAL;
    493 	if (boolean(value(HARDWAREFLOW)))
    494 		cntrl.c_cflag |= CRTSCTS;
    495 	cntrl.c_iflag &= ~(ISTRIP|ICRNL);
    496 	cntrl.c_oflag &= ~OPOST;
    497 	cntrl.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
    498 	cntrl.c_cc[VMIN] = 1;
    499 	cntrl.c_cc[VTIME] = 0;
    500 	if (boolean(value(TAND)))
    501 		cntrl.c_iflag |= IXOFF|IXON;
    502 	else
    503 		cntrl.c_iflag &= ~(IXOFF|IXON);
    504 	return tcsetattr(FD, TCSAFLUSH, &cntrl);
    505 }
    506 
    507 static char partab[0200];
    508 
    509 /*
    510  * Do a write to the remote machine with the correct parity.
    511  * We are doing 8 bit wide output, so we just generate a character
    512  * with the right parity and output it.
    513  */
    514 void
    515 xpwrite(int fd, char *buf, size_t n)
    516 {
    517 	size_t i;
    518 	char *bp;
    519 
    520 	bp = buf;
    521 	if (bits8 == 0)
    522 		for (i = 0; i < n; i++) {
    523 			*bp = partab[(*bp) & 0177];
    524 			bp++;
    525 		}
    526 	if (write(fd, buf, n) < 0) {
    527 		if (errno == EIO)
    528 			tipabort("Lost carrier.");
    529 		/* this is questionable */
    530 		warn("write");
    531 	}
    532 }
    533 
    534 /*
    535  * Build a parity table with appropriate high-order bit.
    536  */
    537 void
    538 setparity(const char *defparity)
    539 {
    540 	int i, flip, clr, set;
    541 	const char *parity;
    542 	static char *curpar;
    543 
    544 	if (value(PARITY) == NULL || ((char *)value(PARITY))[0] == '\0') {
    545 		if (curpar != NULL)
    546 			free(curpar);
    547 		value(PARITY) = curpar = strdup(defparity);
    548 	}
    549 	parity = value(PARITY);
    550 	if (strcmp(parity, "none") == 0) {
    551 		bits8 = 1;
    552 		return;
    553 	}
    554 	bits8 = 0;
    555 	flip = 0;
    556 	clr = 0377;
    557 	set = 0;
    558 	if (strcmp(parity, "odd") == 0)
    559 		flip = 0200;			/* reverse bit 7 */
    560 	else if (strcmp(parity, "zero") == 0)
    561 		clr = 0177;			/* turn off bit 7 */
    562 	else if (strcmp(parity, "one") == 0)
    563 		set = 0200;			/* turn on bit 7 */
    564 	else if (strcmp(parity, "even") != 0) {
    565 		(void)fprintf(stderr, "%s: unknown parity value\r\n", parity);
    566 		(void)fflush(stderr);
    567 	}
    568 	for (i = 0; i < 0200; i++)
    569 		partab[i] = ((evenpartab[i] ^ flip) | set) & clr;
    570 }
    571