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tip.c revision 1.61 
      1 /*	$NetBSD: tip.c,v 1.61 2019/02/22 22:25:22 uwe 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 1.61 2019/02/22 22:25:22 uwe 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 __dead static void	intprompt(int);
     61 __dead static void	tipin(void);
     62 
     63 char	PNbuf[256];			/* This limits the size of a number */
     64 
     65 static char path_phones[] = _PATH_PHONES;
     66 
     67 int
     68 main(int argc, char *argv[])
     69 {
     70 	char *System = NULL;
     71 	int c, i;
     72 	char *p;
     73 	const char *q;
     74 	char sbuf[12];
     75 	int cmdlineBR;
     76 	int fcarg;
     77 
     78 	setprogname(argv[0]);
     79 	gid = getgid();
     80 	egid = getegid();
     81 	uid = getuid();
     82 	euid = geteuid();
     83 	if (strcmp(getprogname(), "cu") == 0) {
     84 		cumode = 1;
     85 		cumain(argc, argv);
     86 		goto cucommon;
     87 	}
     88 
     89 	if (argc > 4)
     90 		tipusage();
     91 
     92 	if (!isatty(0))
     93 		errx(EXIT_FAILURE, "must be interactive");
     94 
     95 	cmdlineBR = 0;
     96 	while((c = getopt(argc, argv, "v0123456789")) != -1) {
     97 		switch(c) {
     98 
     99 		case 'v':
    100 			vflag++;
    101 			break;
    102 
    103 		case '0': case '1': case '2': case '3': case '4':
    104 		case '5': case '6': case '7': case '8': case '9':
    105 			cmdlineBR = cmdlineBR * 10 + (c - '0');
    106 			BR = cmdlineBR;
    107 			break;
    108 
    109 		default:
    110 			warnx("%s, unknown option", argv[1]);
    111 			break;
    112 		}
    113 	}
    114 
    115 	argc -= optind;
    116 	argv += optind;
    117 
    118 	if (argc != 1)
    119 		tipusage();
    120 	else
    121 		System = argv[0];
    122 
    123 
    124 	if (System == NULL)
    125 		goto notnumber;
    126 	if (isalpha((unsigned char)*System))
    127 		goto notnumber;
    128 	/*
    129 	 * System name is really a phone number...
    130 	 * Copy the number then stomp on the original (in case the number
    131 	 *	is private, we don't want 'ps' or 'w' to find it).
    132 	 */
    133 	if (strlen(System) > sizeof PNbuf - 1) {
    134 		errx(1, "phone number too long (max = %d bytes)",
    135 			(int)sizeof(PNbuf) - 1);
    136 	}
    137 	(void)strlcpy(PNbuf, System, sizeof(PNbuf));
    138 	for (p = System; *p; p++)
    139 		*p = '\0';
    140 	PN = PNbuf;
    141 	(void)snprintf(sbuf, sizeof sbuf, "tip%d", (int)BR);
    142 	System = sbuf;
    143 
    144 notnumber:
    145 	(void)signal(SIGINT, cleanup);
    146 	(void)signal(SIGQUIT, cleanup);
    147 	(void)signal(SIGHUP, cleanup);
    148 	(void)signal(SIGTERM, cleanup);
    149 
    150 	if ((i = hunt(System)) == 0) {
    151 		errx(3, "all ports busy");
    152 	}
    153 	if (i == -1) {
    154 		errx(3, "link down");
    155 	}
    156 	setbuf(stdout, NULL);
    157 
    158 	/*
    159 	 * Kludge, their's no easy way to get the initialization
    160 	 *   in the right order, so force it here
    161 	 */
    162 	if ((PH = getenv("PHONES")) == NULL)
    163 		PH = path_phones;
    164 	vinit();				/* init variables */
    165 	setparity("none");			/* set the parity table */
    166 
    167 	/*
    168 	 * Hardwired connections require the
    169 	 *  line speed set before they make any transmissions
    170 	 *  (this is particularly true of things like a DF03-AC)
    171 	 */
    172 	if (HW) {
    173 		if (ttysetup((speed_t)number(value(BAUDRATE))) != 0) {
    174 			errx(3, "bad baud rate %d",
    175 			    (int)number(value(BAUDRATE)));
    176 		}
    177 	}
    178 	if ((q = tip_connect()) != NULL) {
    179 		errx(1, "\07%s\n[EOT]", q);
    180 	}
    181 	if (!HW) {
    182 		if (ttysetup((speed_t)number(value(BAUDRATE))) != 0) {
    183 			errx(3, "bad baud rate %d",
    184 			    (int)number(value(BAUDRATE)));
    185 		}
    186 	}
    187 
    188 
    189 cucommon:
    190 	/*
    191 	 * From here down the code is shared with
    192 	 * the "cu" version of tip.
    193 	 */
    194 
    195 	/*
    196 	 * Direct connections with no carrier require using O_NONBLOCK on
    197 	 * open, but we don't want to keep O_NONBLOCK after open because it
    198 	 * will cause busy waits.
    199 	 */
    200 	if (DC &&
    201 	    ((fcarg = fcntl(FD, F_GETFL, 0)) < 0 ||
    202 	     fcntl(FD, F_SETFL, fcarg & ~O_NONBLOCK) < 0)) {
    203 		err(1, "can't clear O_NONBLOCK");
    204 	}
    205 
    206 	(void)tcgetattr(0, &defterm);
    207 	term = defterm;
    208 	term.c_lflag &= ~(ICANON|IEXTEN|ECHO);
    209 	term.c_iflag &= ~(INPCK|ICRNL);
    210 	term.c_oflag &= ~OPOST;
    211 	term.c_cc[VMIN] = 1;
    212 	term.c_cc[VTIME] = 0;
    213 	defchars = term;
    214 	term.c_cc[VINTR] = term.c_cc[VQUIT] = term.c_cc[VSUSP] =
    215 		term.c_cc[VDSUSP] = term.c_cc[VDISCARD] =
    216 	 	term.c_cc[VLNEXT] = _POSIX_VDISABLE;
    217 	raw();
    218 
    219 	(void)pipe(attndes);
    220 	(void)pipe(fildes);
    221 	(void)pipe(repdes);
    222 	(void)signal(SIGALRM, alrmtimeout);
    223 
    224 	/*
    225 	 * Everything's set up now:
    226 	 *	connection established (hardwired or dialup)
    227 	 *	line conditioned (baud rate, mode, etc.)
    228 	 *	internal data structures (variables)
    229 	 * so, fork one process for local side and one for remote.
    230 	 */
    231 	(void)printf("%s", cumode ? "Connected\r\n" : "\07connected\r\n");
    232 	switch (pid = fork()) {
    233 	default:
    234 		tipin();
    235 		break;
    236 	case 0:
    237 		tipout();
    238 		break;
    239 	case -1:
    240 		err(1, "can't fork");
    241 	}
    242 	/*NOTREACHED*/
    243 	exit(0);	/* XXX: pacify gcc */
    244 }
    245 
    246 void
    247 tipusage(void)
    248 {
    249 	(void)fprintf(stderr, "usage: %s [-v] [-speed] system-name\n",
    250 	    getprogname());
    251 	(void)fprintf(stderr, "       %s [-v] [-speed] phone-number\n",
    252 	    getprogname());
    253 	exit(1);
    254 }
    255 
    256 void
    257 /*ARGSUSED*/
    258 cleanup(int dummy __unused)
    259 {
    260 
    261 	if (odisc)
    262 		(void)ioctl(0, TIOCSETD, &odisc);
    263 	_exit(0);
    264 }
    265 
    266 /*
    267  * put the controlling keyboard into raw mode
    268  */
    269 void
    270 raw(void)
    271 {
    272 
    273 	(void)tcsetattr(0, TCSADRAIN, &term);
    274 }
    275 
    276 
    277 /*
    278  * return keyboard to normal mode
    279  */
    280 void
    281 unraw(void)
    282 {
    283 
    284 	(void)tcsetattr(0, TCSADRAIN, &defterm);
    285 }
    286 
    287 static	jmp_buf promptbuf;
    288 
    289 /*
    290  * Print string ``s'', then read a string
    291  *  in from the terminal.  Handles signals & allows use of
    292  *  normal erase and kill characters.
    293  */
    294 int
    295 prompt(const char *s, char *volatile p, size_t l)
    296 {
    297 	int c;
    298 	char *b = p;
    299 	sig_t oint, oquit;
    300 
    301 	stoprompt = 0;
    302 	oint = signal(SIGINT, intprompt);
    303 	oquit = signal(SIGQUIT, SIG_IGN);
    304 	unraw();
    305 	(void)printf("%s", s);
    306 	if (setjmp(promptbuf) == 0)
    307 		while ((c = getchar()) != EOF && (*p = c) != '\n' &&
    308 		    b + l > p)
    309 			p++;
    310 	*p = '\0';
    311 
    312 	raw();
    313 	(void)signal(SIGINT, oint);
    314 	(void)signal(SIGQUIT, oquit);
    315 	return (stoprompt || p == b);
    316 }
    317 
    318 /*
    319  * Interrupt service routine during prompting
    320  */
    321 static void
    322 /*ARGSUSED*/
    323 intprompt(int dummy __unused)
    324 {
    325 
    326 	(void)signal(SIGINT, SIG_IGN);
    327 	stoprompt = 1;
    328 	(void)printf("\r\n");
    329 	longjmp(promptbuf, 1);
    330 }
    331 
    332 /*
    333  * getchar() wrapper that checks for EOF on the local end.
    334  */
    335 static char
    336 xgetchar(void)
    337 {
    338 	int c = getchar();
    339 	if (__predict_false(c == EOF)) {
    340 		cleanup(SIGHUP);
    341 		/* NOTREACHED */
    342 	}
    343 
    344 	return (char)c & STRIP_PAR;
    345 }
    346 
    347 
    348 /*
    349  * ****TIPIN   TIPIN****
    350  */
    351 static void
    352 tipin(void)
    353 {
    354 	char gch, bol = 1;
    355 
    356 	/*
    357 	 * Kinda klugey here...
    358 	 *   check for scripting being turned on from the .tiprc file,
    359 	 *   but be careful about just using setscript(), as we may
    360 	 *   send a SIGEMT before tipout has a chance to set up catching
    361 	 *   it; so wait a second, then setscript()
    362 	 */
    363 	if (boolean(value(SCRIPT))) {
    364 		(void)sleep(1);
    365 		setscript();
    366 	}
    367 
    368 	for (;;) {
    369 		gch = xgetchar();
    370 		if ((gch == character(value(ESCAPE))) && bol) {
    371 			if (!(gch = escape()))
    372 				continue;
    373 		} else if (!cumode &&
    374 		    gch && gch == character(value(RAISECHAR))) {
    375 			setboolean(value(RAISE), !boolean(value(RAISE)));
    376 			continue;
    377 		} else if (gch == '\r' || gch == '\n') {
    378 			bol = 1;
    379 			xpwrite(FD, &gch, 1);
    380 			if (boolean(value(HALFDUPLEX)))
    381 				(void)printf("%s\n", gch == '\r' ? "\r" : "");
    382 			continue;
    383 		} else if (!cumode && gch && gch == character(value(FORCE)))
    384 			gch = xgetchar();
    385 		bol = any(gch, value(EOL));
    386 		if (boolean(value(RAISE)) && islower((unsigned char)gch))
    387 			gch = toupper((unsigned char)gch);
    388 		xpwrite(FD, &gch, 1);
    389 		if (boolean(value(HALFDUPLEX)))
    390 			(void)printf("%c", gch);
    391 	}
    392 }
    393 
    394 /*
    395  * Escape handler --
    396  *  called on recognition of ``escapec'' at the beginning of a line
    397  */
    398 int
    399 escape(void)
    400 {
    401 	char gch;
    402 	esctable_t *p;
    403 	char c = character(value(ESCAPE));
    404 
    405 	gch = xgetchar();
    406 	for (p = etable; p->e_char; p++)
    407 		if (p->e_char == gch) {
    408 			if ((p->e_flags&PRIV) && uid)
    409 				continue;
    410 			(void)printf("%s", ctrl(c));
    411 			(*p->e_func)(gch);
    412 			return (0);
    413 		}
    414 	/* ESCAPE ESCAPE forces ESCAPE */
    415 	if (c != gch)
    416 		xpwrite(FD, &c, 1);
    417 	return (gch);
    418 }
    419 
    420 int
    421 any(char c, const char *p)
    422 {
    423 
    424 	while (p && *p)
    425 		if (*p++ == c)
    426 			return (1);
    427 	return (0);
    428 }
    429 
    430 char *
    431 interp(const char *s)
    432 {
    433 	static char buf[256];
    434 	char *p = buf, c;
    435 	const char *q;
    436 
    437 	while ((c = *s++) != 0 && buf + sizeof buf - p > 2) {
    438 		for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
    439 			if (*q++ == c) {
    440 				*p++ = '\\'; *p++ = *q;
    441 				goto next;
    442 			}
    443 		if (c < 040) {
    444 			*p++ = '^'; *p++ = c + 'A'-1;
    445 		} else if (c == 0177) {
    446 			*p++ = '^'; *p++ = '?';
    447 		} else
    448 			*p++ = c;
    449 	next:
    450 		;
    451 	}
    452 	*p = '\0';
    453 	return (buf);
    454 }
    455 
    456 char *
    457 ctrl(char c)
    458 {
    459 	static char s[3];
    460 
    461 	if (c < 040 || c == 0177) {
    462 		s[0] = '^';
    463 		s[1] = c == 0177 ? '?' : c+'A'-1;
    464 		s[2] = '\0';
    465 	} else {
    466 		s[0] = c;
    467 		s[1] = '\0';
    468 	}
    469 	return (s);
    470 }
    471 
    472 /*
    473  * Help command
    474  */
    475 void
    476 help(char c)
    477 {
    478 	esctable_t *p;
    479 
    480 	(void)printf("%c\r\n", c);
    481 	for (p = etable; p->e_char; p++) {
    482 		if ((p->e_flags&PRIV) && uid)
    483 			continue;
    484 		(void)printf("%2s", ctrl(character(value(ESCAPE))));
    485 		(void)printf("%-2s %c   %s\r\n", ctrl(p->e_char),
    486 			p->e_flags&EXP ? '*': ' ', p->e_help);
    487 	}
    488 }
    489 
    490 /*
    491  * Set up the "remote" tty's state
    492  */
    493 int
    494 ttysetup(speed_t spd)
    495 {
    496 	struct termios	cntrl;
    497 
    498 	(void)tcgetattr(FD, &cntrl);
    499 	(void)cfsetospeed(&cntrl, spd);
    500 	(void)cfsetispeed(&cntrl, spd);
    501 	cntrl.c_cflag &= ~(CSIZE|PARENB);
    502 	cntrl.c_cflag |= CS8;
    503 	if (DC)
    504 		cntrl.c_cflag |= CLOCAL;
    505 	if (boolean(value(HARDWAREFLOW)))
    506 		cntrl.c_cflag |= CRTSCTS;
    507 	cntrl.c_iflag &= ~(ISTRIP|ICRNL);
    508 	cntrl.c_oflag &= ~OPOST;
    509 	cntrl.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
    510 	cntrl.c_cc[VMIN] = 1;
    511 	cntrl.c_cc[VTIME] = 0;
    512 	if (boolean(value(TAND)))
    513 		cntrl.c_iflag |= IXOFF|IXON;
    514 	else
    515 		cntrl.c_iflag &= ~(IXOFF|IXON);
    516 	return tcsetattr(FD, TCSAFLUSH, &cntrl);
    517 }
    518 
    519 static char partab[0200];
    520 
    521 /*
    522  * Do a write to the remote machine with the correct parity.
    523  * We are doing 8 bit wide output, so we just generate a character
    524  * with the right parity and output it.
    525  */
    526 void
    527 xpwrite(int fd, char *buf, size_t n)
    528 {
    529 	size_t i;
    530 	char *bp;
    531 
    532 	bp = buf;
    533 	if (bits8 == 0)
    534 		for (i = 0; i < n; i++) {
    535 			*bp = partab[(*bp) & 0177];
    536 			bp++;
    537 		}
    538 	if (write(fd, buf, n) < 0) {
    539 		if (errno == EIO)
    540 			tipabort("Lost carrier.");
    541 		/* this is questionable */
    542 		warn("write");
    543 	}
    544 }
    545 
    546 /*
    547  * Build a parity table with appropriate high-order bit.
    548  */
    549 void
    550 setparity(const char *defparity)
    551 {
    552 	int i, flip, clr, set;
    553 	const char *parity;
    554 	static char *curpar;
    555 
    556 	if (value(PARITY) == NULL || ((char *)value(PARITY))[0] == '\0') {
    557 		if (curpar != NULL)
    558 			free(curpar);
    559 		value(PARITY) = curpar = strdup(defparity);
    560 	}
    561 	parity = value(PARITY);
    562 	if (strcmp(parity, "none") == 0) {
    563 		bits8 = 1;
    564 		return;
    565 	}
    566 	bits8 = 0;
    567 	flip = 0;
    568 	clr = 0377;
    569 	set = 0;
    570 	if (strcmp(parity, "odd") == 0)
    571 		flip = 0200;			/* reverse bit 7 */
    572 	else if (strcmp(parity, "zero") == 0)
    573 		clr = 0177;			/* turn off bit 7 */
    574 	else if (strcmp(parity, "one") == 0)
    575 		set = 0200;			/* turn on bit 7 */
    576 	else if (strcmp(parity, "even") != 0) {
    577 		(void)fprintf(stderr, "%s: unknown parity value\r\n", parity);
    578 		(void)fflush(stderr);
    579 	}
    580 	for (i = 0; i < 0200; i++)
    581 		partab[i] = ((evenpartab[i] ^ flip) | set) & clr;
    582 }
    583