Home | History | Annotate | Line # | Download | only in tip
tip.c revision 1.36 
      1 /*	$NetBSD: tip.c,v 1.36 2006/04/03 02:01:28 perry 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 1.36 2006/04/03 02:01:28 perry 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 #ifdef ACULOG
    148 	loginit();
    149 #endif
    150 
    151 	/*
    152 	 * Kludge, their's no easy way to get the initialization
    153 	 *   in the right order, so force it here
    154 	 */
    155 	if ((PH = getenv("PHONES")) == NULL)
    156 		PH = path_phones;
    157 	vinit();				/* init variables */
    158 	setparity("none");			/* set the parity table */
    159 
    160 	/*
    161 	 * Hardwired connections require the
    162 	 *  line speed set before they make any transmissions
    163 	 *  (this is particularly true of things like a DF03-AC)
    164 	 */
    165 	if (HW) {
    166 		if (ttysetup(i) != 0) {
    167 			errx(3, "bad baud rate %d",
    168 			    (int)number(value(BAUDRATE)));
    169 		}
    170 	}
    171 	if ((q = connect()) != NULL) {
    172 		errx(1, "\07%s\n[EOT]\n", q);
    173 	}
    174 	if (!HW) {
    175 		if (ttysetup(i) != 0) {
    176 			errx(3, "bad baud rate %d",
    177 			    (int)number(value(BAUDRATE)));
    178 		}
    179 	}
    180 
    181 
    182 	/*
    183 	 * Direct connections with no carrier require using O_NONBLOCK on
    184 	 * open, but we don't want to keep O_NONBLOCK after open because it
    185 	 * will cause busy waits.
    186 	 */
    187 	if (DC &&
    188 	    ((fcarg = fcntl(FD, F_GETFL, 0)) < 0 ||
    189 	     fcntl(FD, F_SETFL, fcarg & ~O_NONBLOCK) < 0)) {
    190 		err(1, "can't clear O_NONBLOCK");
    191 	}
    192 
    193 cucommon:
    194 	/*
    195 	 * From here down the code is shared with
    196 	 * the "cu" version of tip.
    197 	 */
    198 
    199 	tcgetattr(0, &defterm);
    200 	term = defterm;
    201 	term.c_lflag &= ~(ICANON|IEXTEN|ECHO);
    202 	term.c_iflag &= ~(INPCK|ICRNL);
    203 	term.c_oflag &= ~OPOST;
    204 	term.c_cc[VMIN] = 1;
    205 	term.c_cc[VTIME] = 0;
    206 	defchars = term;
    207 	term.c_cc[VINTR] = term.c_cc[VQUIT] = term.c_cc[VSUSP] =
    208 		term.c_cc[VDSUSP] = term.c_cc[VDISCARD] =
    209 	 	term.c_cc[VLNEXT] = _POSIX_VDISABLE;
    210 	raw();
    211 
    212 	pipe(fildes); pipe(repdes);
    213 	(void)signal(SIGALRM, alrmtimeout);
    214 
    215 	/*
    216 	 * Everything's set up now:
    217 	 *	connection established (hardwired or dialup)
    218 	 *	line conditioned (baud rate, mode, etc.)
    219 	 *	internal data structures (variables)
    220 	 * so, fork one process for local side and one for remote.
    221 	 */
    222 	printf("%s", cumode ? "Connected\r\n" : "\07connected\r\n");
    223 	switch (pid = fork()) {
    224 	default:
    225 		tipin();
    226 		break;
    227 	case 0:
    228 		tipout();
    229 		break;
    230 	case -1:
    231 		err(1, "can't fork");
    232 	}
    233 	/*NOTREACHED*/
    234 	exit(0);	/* XXX: pacify gcc */
    235 }
    236 
    237 void
    238 cleanup(int dummy)
    239 {
    240 
    241 	if (odisc)
    242 		ioctl(0, TIOCSETD, (char *)&odisc);
    243 	exit(0);
    244 }
    245 
    246 /*
    247  * put the controlling keyboard into raw mode
    248  */
    249 void
    250 raw(void)
    251 {
    252 
    253 	tcsetattr(0, TCSADRAIN, &term);
    254 }
    255 
    256 
    257 /*
    258  * return keyboard to normal mode
    259  */
    260 void
    261 unraw(void)
    262 {
    263 
    264 	tcsetattr(0, TCSADRAIN, &defterm);
    265 }
    266 
    267 static	jmp_buf promptbuf;
    268 
    269 /*
    270  * Print string ``s'', then read a string
    271  *  in from the terminal.  Handles signals & allows use of
    272  *  normal erase and kill characters.
    273  */
    274 int
    275 prompt(const char *s, char *p, size_t l)
    276 {
    277 	int c;
    278 	char *b = p;
    279 	sig_t oint, oquit;
    280 
    281 #if __GNUC__		/* XXX: pacify gcc */
    282 	(void)&p;
    283 #endif
    284 
    285 	stoprompt = 0;
    286 	oint = signal(SIGINT, intprompt);
    287 	oquit = signal(SIGQUIT, SIG_IGN);
    288 	unraw();
    289 	printf("%s", s);
    290 	if (setjmp(promptbuf) == 0)
    291 		while ((c = getchar()) != -1 && (*p = c) != '\n' &&
    292 		    b + l > p)
    293 			p++;
    294 	*p = '\0';
    295 
    296 	raw();
    297 	(void)signal(SIGINT, oint);
    298 	(void)signal(SIGQUIT, oquit);
    299 	return (stoprompt || p == b);
    300 }
    301 
    302 /*
    303  * Interrupt service routine during prompting
    304  */
    305 void
    306 intprompt(int dummy)
    307 {
    308 
    309 	(void)signal(SIGINT, SIG_IGN);
    310 	stoprompt = 1;
    311 	printf("\r\n");
    312 	longjmp(promptbuf, 1);
    313 }
    314 
    315 /*
    316  * ****TIPIN   TIPIN****
    317  */
    318 void
    319 tipin(void)
    320 {
    321 	char gch, bol = 1;
    322 
    323 	/*
    324 	 * Kinda klugey here...
    325 	 *   check for scripting being turned on from the .tiprc file,
    326 	 *   but be careful about just using setscript(), as we may
    327 	 *   send a SIGEMT before tipout has a chance to set up catching
    328 	 *   it; so wait a second, then setscript()
    329 	 */
    330 	if (boolean(value(SCRIPT))) {
    331 		sleep(1);
    332 		setscript();
    333 	}
    334 
    335 	while (1) {
    336 		gch = getchar()&STRIP_PAR;
    337 		if ((gch == character(value(ESCAPE))) && bol) {
    338 			if (!(gch = escape()))
    339 				continue;
    340 		} else if (!cumode &&
    341 		    gch && gch == character(value(RAISECHAR))) {
    342 			setboolean(value(RAISE), !boolean(value(RAISE)));
    343 			continue;
    344 		} else if (gch == '\r') {
    345 			bol = 1;
    346 			xpwrite(FD, &gch, 1);
    347 			if (boolean(value(HALFDUPLEX)))
    348 				printf("\r\n");
    349 			continue;
    350 		} else if (!cumode && gch && gch == character(value(FORCE)))
    351 			gch = getchar()&STRIP_PAR;
    352 		bol = any(gch, value(EOL));
    353 		if (boolean(value(RAISE)) && islower((unsigned char)gch))
    354 			gch = toupper((unsigned char)gch);
    355 		xpwrite(FD, &gch, 1);
    356 		if (boolean(value(HALFDUPLEX)))
    357 			printf("%c", gch);
    358 	}
    359 }
    360 
    361 /*
    362  * Escape handler --
    363  *  called on recognition of ``escapec'' at the beginning of a line
    364  */
    365 int
    366 escape(void)
    367 {
    368 	char gch;
    369 	esctable_t *p;
    370 	char c = character(value(ESCAPE));
    371 
    372 	gch = (getchar()&STRIP_PAR);
    373 	for (p = etable; p->e_char; p++)
    374 		if (p->e_char == gch) {
    375 			if ((p->e_flags&PRIV) && uid)
    376 				continue;
    377 			printf("%s", ctrl(c));
    378 			(*p->e_func)(gch);
    379 			return (0);
    380 		}
    381 	/* ESCAPE ESCAPE forces ESCAPE */
    382 	if (c != gch)
    383 		xpwrite(FD, &c, 1);
    384 	return (gch);
    385 }
    386 
    387 int
    388 any(char c, const char *p)
    389 {
    390 
    391 	while (p && *p)
    392 		if (*p++ == c)
    393 			return (1);
    394 	return (0);
    395 }
    396 
    397 char *
    398 interp(const char *s)
    399 {
    400 	static char buf[256];
    401 	char *p = buf, c;
    402 	const char *q;
    403 
    404 	while ((c = *s++) != 0 && buf + sizeof buf - p > 2) {
    405 		for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
    406 			if (*q++ == c) {
    407 				*p++ = '\\'; *p++ = *q;
    408 				goto next;
    409 			}
    410 		if (c < 040) {
    411 			*p++ = '^'; *p++ = c + 'A'-1;
    412 		} else if (c == 0177) {
    413 			*p++ = '^'; *p++ = '?';
    414 		} else
    415 			*p++ = c;
    416 	next:
    417 		;
    418 	}
    419 	*p = '\0';
    420 	return (buf);
    421 }
    422 
    423 char *
    424 ctrl(char c)
    425 {
    426 	static char s[3];
    427 
    428 	if (c < 040 || c == 0177) {
    429 		s[0] = '^';
    430 		s[1] = c == 0177 ? '?' : c+'A'-1;
    431 		s[2] = '\0';
    432 	} else {
    433 		s[0] = c;
    434 		s[1] = '\0';
    435 	}
    436 	return (s);
    437 }
    438 
    439 /*
    440  * Help command
    441  */
    442 void
    443 help(char c)
    444 {
    445 	esctable_t *p;
    446 
    447 	printf("%c\r\n", c);
    448 	for (p = etable; p->e_char; p++) {
    449 		if ((p->e_flags&PRIV) && uid)
    450 			continue;
    451 		printf("%2s", ctrl(character(value(ESCAPE))));
    452 		printf("%-2s %c   %s\r\n", ctrl(p->e_char),
    453 			p->e_flags&EXP ? '*': ' ', p->e_help);
    454 	}
    455 }
    456 
    457 /*
    458  * Set up the "remote" tty's state
    459  */
    460 int
    461 ttysetup(int spd)
    462 {
    463 	struct termios	cntrl;
    464 
    465 	tcgetattr(FD, &cntrl);
    466 	cfsetospeed(&cntrl, spd);
    467 	cfsetispeed(&cntrl, spd);
    468 	cntrl.c_cflag &= ~(CSIZE|PARENB);
    469 	cntrl.c_cflag |= CS8;
    470 	if (DC)
    471 		cntrl.c_cflag |= CLOCAL;
    472 	if (boolean(value(HARDWAREFLOW)))
    473 		cntrl.c_cflag |= CRTSCTS;
    474 	cntrl.c_iflag &= ~(ISTRIP|ICRNL);
    475 	cntrl.c_oflag &= ~OPOST;
    476 	cntrl.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
    477 	cntrl.c_cc[VMIN] = 1;
    478 	cntrl.c_cc[VTIME] = 0;
    479 	if (boolean(value(TAND)))
    480 		cntrl.c_iflag |= IXOFF;
    481 	return(tcsetattr(FD, TCSAFLUSH, &cntrl));
    482 }
    483 
    484 static char partab[0200];
    485 
    486 /*
    487  * Do a write to the remote machine with the correct parity.
    488  * We are doing 8 bit wide output, so we just generate a character
    489  * with the right parity and output it.
    490  */
    491 void
    492 xpwrite(int fd, char *buf, int n)
    493 {
    494 	int i;
    495 	char *bp;
    496 
    497 	bp = buf;
    498 	if (bits8 == 0)
    499 		for (i = 0; i < n; i++) {
    500 			*bp = partab[(*bp) & 0177];
    501 			bp++;
    502 		}
    503 	if (write(fd, buf, n) < 0) {
    504 		if (errno == EIO)
    505 			tipabort("Lost carrier.");
    506 		/* this is questionable */
    507 		warn("write");
    508 	}
    509 }
    510 
    511 /*
    512  * Build a parity table with appropriate high-order bit.
    513  */
    514 void
    515 setparity(const char *defparity)
    516 {
    517 	int i, flip, clr, set;
    518 	const char *parity;
    519 	static char *curpar;
    520 
    521 	if (value(PARITY) == NULL || (value(PARITY))[0] == '\0') {
    522 		if (curpar != NULL)
    523 			free(curpar);
    524 		value(PARITY) = curpar = strdup(defparity);
    525 	}
    526 	parity = value(PARITY);
    527 	if (equal(parity, "none")) {
    528 		bits8 = 1;
    529 		return;
    530 	}
    531 	bits8 = 0;
    532 	flip = 0;
    533 	clr = 0377;
    534 	set = 0;
    535 	if (equal(parity, "odd"))
    536 		flip = 0200;			/* reverse bit 7 */
    537 	else if (equal(parity, "zero"))
    538 		clr = 0177;			/* turn off bit 7 */
    539 	else if (equal(parity, "one"))
    540 		set = 0200;			/* turn on bit 7 */
    541 	else if (!equal(parity, "even")) {
    542 		(void) fprintf(stderr, "%s: unknown parity value\r\n", parity);
    543 		(void) fflush(stderr);
    544 	}
    545 	for (i = 0; i < 0200; i++)
    546 		partab[i] = ((evenpartab[i] ^ flip) | set) & clr;
    547 }
    548