Home | History | Annotate | Line # | Download | only in tip
tip.c revision 1.57 
      1 /*	$NetBSD: tip.c,v 1.57 2015/06/16 22:54:11 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 1.57 2015/06/16 22:54:11 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 	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 		errx(EXIT_FAILURE, must be interactive");
     95 	}
     96 
     97 	cmdlineBR = 0;
     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 			cmdlineBR = cmdlineBR * 10 + (c - '0');
    108 			BR = cmdlineBR;
    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 		errx(3, "all ports busy");
    154 	}
    155 	if (i == -1) {
    156 		errx(3, "link down");
    157 	}
    158 	setbuf(stdout, NULL);
    159 
    160 	/*
    161 	 * Kludge, their's no easy way to get the initialization
    162 	 *   in the right order, so force it here
    163 	 */
    164 	if ((PH = getenv("PHONES")) == NULL)
    165 		PH = path_phones;
    166 	vinit();				/* init variables */
    167 	setparity("none");			/* set the parity table */
    168 
    169 	/*
    170 	 * Hardwired connections require the
    171 	 *  line speed set before they make any transmissions
    172 	 *  (this is particularly true of things like a DF03-AC)
    173 	 */
    174 	if (HW) {
    175 		if (ttysetup((speed_t)number(value(BAUDRATE))) != 0) {
    176 			errx(3, "bad baud rate %d",
    177 			    (int)number(value(BAUDRATE)));
    178 		}
    179 	}
    180 	if ((q = tip_connect()) != NULL) {
    181 		errx(1, "\07%s\n[EOT]", q);
    182 	}
    183 	if (!HW) {
    184 		if (ttysetup((speed_t)number(value(BAUDRATE))) != 0) {
    185 			errx(3, "bad baud rate %d",
    186 			    (int)number(value(BAUDRATE)));
    187 		}
    188 	}
    189 
    190 
    191 cucommon:
    192 	/*
    193 	 * From here down the code is shared with
    194 	 * the "cu" version of tip.
    195 	 */
    196 
    197 	/*
    198 	 * Direct connections with no carrier require using O_NONBLOCK on
    199 	 * open, but we don't want to keep O_NONBLOCK after open because it
    200 	 * will cause busy waits.
    201 	 */
    202 	if (DC &&
    203 	    ((fcarg = fcntl(FD, F_GETFL, 0)) < 0 ||
    204 	     fcntl(FD, F_SETFL, fcarg & ~O_NONBLOCK) < 0)) {
    205 		err(1, "can't clear O_NONBLOCK");
    206 	}
    207 
    208 	(void)tcgetattr(0, &defterm);
    209 	term = defterm;
    210 	term.c_lflag &= ~(ICANON|IEXTEN|ECHO);
    211 	term.c_iflag &= ~(INPCK|ICRNL);
    212 	term.c_oflag &= ~OPOST;
    213 	term.c_cc[VMIN] = 1;
    214 	term.c_cc[VTIME] = 0;
    215 	defchars = term;
    216 	term.c_cc[VINTR] = term.c_cc[VQUIT] = term.c_cc[VSUSP] =
    217 		term.c_cc[VDSUSP] = term.c_cc[VDISCARD] =
    218 	 	term.c_cc[VLNEXT] = _POSIX_VDISABLE;
    219 	raw();
    220 
    221 	(void)pipe(attndes);
    222 	(void)pipe(fildes);
    223 	(void)pipe(repdes);
    224 	(void)signal(SIGALRM, alrmtimeout);
    225 
    226 	/*
    227 	 * Everything's set up now:
    228 	 *	connection established (hardwired or dialup)
    229 	 *	line conditioned (baud rate, mode, etc.)
    230 	 *	internal data structures (variables)
    231 	 * so, fork one process for local side and one for remote.
    232 	 */
    233 	(void)printf("%s", cumode ? "Connected\r\n" : "\07connected\r\n");
    234 	switch (pid = fork()) {
    235 	default:
    236 		tipin();
    237 		break;
    238 	case 0:
    239 		tipout();
    240 		break;
    241 	case -1:
    242 		err(1, "can't fork");
    243 	}
    244 	/*NOTREACHED*/
    245 	exit(0);	/* XXX: pacify gcc */
    246 }
    247 
    248 void
    249 tipusage(void)
    250 {
    251 	(void)fprintf(stderr, "usage: %s [-v] [-speed] system-name\n",
    252 	    getprogname());
    253 	(void)fprintf(stderr, "       %s [-v] [-speed] phone-number\n",
    254 	    getprogname());
    255 	exit(1);
    256 }
    257 
    258 void
    259 /*ARGSUSED*/
    260 cleanup(int dummy __unused)
    261 {
    262 
    263 	if (odisc)
    264 		(void)ioctl(0, TIOCSETD, &odisc);
    265 	_exit(0);
    266 }
    267 
    268 /*
    269  * put the controlling keyboard into raw mode
    270  */
    271 void
    272 raw(void)
    273 {
    274 
    275 	(void)tcsetattr(0, TCSADRAIN, &term);
    276 }
    277 
    278 
    279 /*
    280  * return keyboard to normal mode
    281  */
    282 void
    283 unraw(void)
    284 {
    285 
    286 	(void)tcsetattr(0, TCSADRAIN, &defterm);
    287 }
    288 
    289 static	jmp_buf promptbuf;
    290 
    291 /*
    292  * Print string ``s'', then read a string
    293  *  in from the terminal.  Handles signals & allows use of
    294  *  normal erase and kill characters.
    295  */
    296 int
    297 prompt(const char *s, char *volatile p, size_t l)
    298 {
    299 	int c;
    300 	char *b = p;
    301 	sig_t oint, oquit;
    302 
    303 	stoprompt = 0;
    304 	oint = signal(SIGINT, intprompt);
    305 	oquit = signal(SIGQUIT, SIG_IGN);
    306 	unraw();
    307 	(void)printf("%s", s);
    308 	if (setjmp(promptbuf) == 0)
    309 		while ((c = getchar()) != -1 && (*p = c) != '\n' &&
    310 		    b + l > p)
    311 			p++;
    312 	*p = '\0';
    313 
    314 	raw();
    315 	(void)signal(SIGINT, oint);
    316 	(void)signal(SIGQUIT, oquit);
    317 	return (stoprompt || p == b);
    318 }
    319 
    320 /*
    321  * Interrupt service routine during prompting
    322  */
    323 static void
    324 /*ARGSUSED*/
    325 intprompt(int dummy __unused)
    326 {
    327 
    328 	(void)signal(SIGINT, SIG_IGN);
    329 	stoprompt = 1;
    330 	(void)printf("\r\n");
    331 	longjmp(promptbuf, 1);
    332 }
    333 
    334 /*
    335  * ****TIPIN   TIPIN****
    336  */
    337 static void
    338 tipin(void)
    339 {
    340 	char gch, bol = 1;
    341 
    342 	/*
    343 	 * Kinda klugey here...
    344 	 *   check for scripting being turned on from the .tiprc file,
    345 	 *   but be careful about just using setscript(), as we may
    346 	 *   send a SIGEMT before tipout has a chance to set up catching
    347 	 *   it; so wait a second, then setscript()
    348 	 */
    349 	if (boolean(value(SCRIPT))) {
    350 		(void)sleep(1);
    351 		setscript();
    352 	}
    353 
    354 	for (;;) {
    355 		gch = getchar()&STRIP_PAR;
    356 		if ((gch == character(value(ESCAPE))) && bol) {
    357 			if (!(gch = escape()))
    358 				continue;
    359 		} else if (!cumode &&
    360 		    gch && gch == character(value(RAISECHAR))) {
    361 			setboolean(value(RAISE), !boolean(value(RAISE)));
    362 			continue;
    363 		} else if (gch == '\r') {
    364 			bol = 1;
    365 			xpwrite(FD, &gch, 1);
    366 			if (boolean(value(HALFDUPLEX)))
    367 				(void)printf("\r\n");
    368 			continue;
    369 		} else if (!cumode && gch && gch == character(value(FORCE)))
    370 			gch = getchar()&STRIP_PAR;
    371 		bol = any(gch, value(EOL));
    372 		if (boolean(value(RAISE)) && islower((unsigned char)gch))
    373 			gch = toupper((unsigned char)gch);
    374 		xpwrite(FD, &gch, 1);
    375 		if (boolean(value(HALFDUPLEX)))
    376 			(void)printf("%c", gch);
    377 	}
    378 }
    379 
    380 /*
    381  * Escape handler --
    382  *  called on recognition of ``escapec'' at the beginning of a line
    383  */
    384 int
    385 escape(void)
    386 {
    387 	char gch;
    388 	esctable_t *p;
    389 	char c = character(value(ESCAPE));
    390 
    391 	gch = (getchar()&STRIP_PAR);
    392 	for (p = etable; p->e_char; p++)
    393 		if (p->e_char == gch) {
    394 			if ((p->e_flags&PRIV) && uid)
    395 				continue;
    396 			(void)printf("%s", ctrl(c));
    397 			(*p->e_func)(gch);
    398 			return (0);
    399 		}
    400 	/* ESCAPE ESCAPE forces ESCAPE */
    401 	if (c != gch)
    402 		xpwrite(FD, &c, 1);
    403 	return (gch);
    404 }
    405 
    406 int
    407 any(char c, const char *p)
    408 {
    409 
    410 	while (p && *p)
    411 		if (*p++ == c)
    412 			return (1);
    413 	return (0);
    414 }
    415 
    416 char *
    417 interp(const char *s)
    418 {
    419 	static char buf[256];
    420 	char *p = buf, c;
    421 	const char *q;
    422 
    423 	while ((c = *s++) != 0 && buf + sizeof buf - p > 2) {
    424 		for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
    425 			if (*q++ == c) {
    426 				*p++ = '\\'; *p++ = *q;
    427 				goto next;
    428 			}
    429 		if (c < 040) {
    430 			*p++ = '^'; *p++ = c + 'A'-1;
    431 		} else if (c == 0177) {
    432 			*p++ = '^'; *p++ = '?';
    433 		} else
    434 			*p++ = c;
    435 	next:
    436 		;
    437 	}
    438 	*p = '\0';
    439 	return (buf);
    440 }
    441 
    442 char *
    443 ctrl(char c)
    444 {
    445 	static char s[3];
    446 
    447 	if (c < 040 || c == 0177) {
    448 		s[0] = '^';
    449 		s[1] = c == 0177 ? '?' : c+'A'-1;
    450 		s[2] = '\0';
    451 	} else {
    452 		s[0] = c;
    453 		s[1] = '\0';
    454 	}
    455 	return (s);
    456 }
    457 
    458 /*
    459  * Help command
    460  */
    461 void
    462 help(char c)
    463 {
    464 	esctable_t *p;
    465 
    466 	(void)printf("%c\r\n", c);
    467 	for (p = etable; p->e_char; p++) {
    468 		if ((p->e_flags&PRIV) && uid)
    469 			continue;
    470 		(void)printf("%2s", ctrl(character(value(ESCAPE))));
    471 		(void)printf("%-2s %c   %s\r\n", ctrl(p->e_char),
    472 			p->e_flags&EXP ? '*': ' ', p->e_help);
    473 	}
    474 }
    475 
    476 /*
    477  * Set up the "remote" tty's state
    478  */
    479 int
    480 ttysetup(speed_t spd)
    481 {
    482 	struct termios	cntrl;
    483 
    484 	(void)tcgetattr(FD, &cntrl);
    485 	(void)cfsetospeed(&cntrl, spd);
    486 	(void)cfsetispeed(&cntrl, spd);
    487 	cntrl.c_cflag &= ~(CSIZE|PARENB);
    488 	cntrl.c_cflag |= CS8;
    489 	if (DC)
    490 		cntrl.c_cflag |= CLOCAL;
    491 	if (boolean(value(HARDWAREFLOW)))
    492 		cntrl.c_cflag |= CRTSCTS;
    493 	cntrl.c_iflag &= ~(ISTRIP|ICRNL);
    494 	cntrl.c_oflag &= ~OPOST;
    495 	cntrl.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
    496 	cntrl.c_cc[VMIN] = 1;
    497 	cntrl.c_cc[VTIME] = 0;
    498 	if (boolean(value(TAND)))
    499 		cntrl.c_iflag |= IXOFF|IXON;
    500 	else
    501 		cntrl.c_iflag &= ~(IXOFF|IXON);
    502 	return tcsetattr(FD, TCSAFLUSH, &cntrl);
    503 }
    504 
    505 static char partab[0200];
    506 
    507 /*
    508  * Do a write to the remote machine with the correct parity.
    509  * We are doing 8 bit wide output, so we just generate a character
    510  * with the right parity and output it.
    511  */
    512 void
    513 xpwrite(int fd, char *buf, size_t n)
    514 {
    515 	size_t i;
    516 	char *bp;
    517 
    518 	bp = buf;
    519 	if (bits8 == 0)
    520 		for (i = 0; i < n; i++) {
    521 			*bp = partab[(*bp) & 0177];
    522 			bp++;
    523 		}
    524 	if (write(fd, buf, n) < 0) {
    525 		if (errno == EIO)
    526 			tipabort("Lost carrier.");
    527 		/* this is questionable */
    528 		warn("write");
    529 	}
    530 }
    531 
    532 /*
    533  * Build a parity table with appropriate high-order bit.
    534  */
    535 void
    536 setparity(const char *defparity)
    537 {
    538 	int i, flip, clr, set;
    539 	const char *parity;
    540 	static char *curpar;
    541 
    542 	if (value(PARITY) == NULL || ((char *)value(PARITY))[0] == '\0') {
    543 		if (curpar != NULL)
    544 			free(curpar);
    545 		value(PARITY) = curpar = strdup(defparity);
    546 	}
    547 	parity = value(PARITY);
    548 	if (strcmp(parity, "none") == 0) {
    549 		bits8 = 1;
    550 		return;
    551 	}
    552 	bits8 = 0;
    553 	flip = 0;
    554 	clr = 0377;
    555 	set = 0;
    556 	if (strcmp(parity, "odd") == 0)
    557 		flip = 0200;			/* reverse bit 7 */
    558 	else if (strcmp(parity, "zero") == 0)
    559 		clr = 0177;			/* turn off bit 7 */
    560 	else if (strcmp(parity, "one") == 0)
    561 		set = 0200;			/* turn on bit 7 */
    562 	else if (strcmp(parity, "even") != 0) {
    563 		(void)fprintf(stderr, "%s: unknown parity value\r\n", parity);
    564 		(void)fflush(stderr);
    565 	}
    566 	for (i = 0; i < 0200; i++)
    567 		partab[i] = ((evenpartab[i] ^ flip) | set) & clr;
    568 }
    569