2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
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12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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29 * @(#) Copyright (c) 1983, 1993 The Regents of the University of California. All rights reserved.
30 * @(#)tip.c 8.1 (Berkeley) 6/6/93
31 * $FreeBSD: src/usr.bin/tip/tip/tip.c,v 1.12.2.2 2001/06/02 08:08:24 phk Exp $
37 void ttysetup (int speed);
40 * tip - UNIX link to other systems
41 * tip [-v] [-speed] system-name
43 * cu phone-number [-s speed] [-l line] [-a acu]
48 #include <sys/types.h>
51 #include "pathnames.h"
53 static void intprompt(int);
54 static void killchild(void);
55 static void tipdone(int);
56 static char *sname(char *);
57 char PNbuf[256]; /* This limits the size of a number */
59 static void usage(void);
60 void setparity(char *);
61 void xpwrite(int, char *, int);
64 int prompt(char *, char *, size_t);
67 void daemon_uid(void);
71 main(int argc, char *argv[])
83 if (equal(sname(argv[0]), "cu")) {
92 errx(1, "must be interactive");
94 for (; argc > 1; argv++, argc--) {
95 if (argv[1][0] != '-')
97 else switch (argv[1][1]) {
103 case '0': case '1': case '2': case '3': case '4':
104 case '5': case '6': case '7': case '8': case '9':
105 BR = atoi(&argv[1][1]);
109 warnx("%s, unknown option", argv[1]);
116 if (isalpha(*system))
119 * System name is really a phone number...
120 * Copy the number then stomp on the original (in case the number
121 * is private, we don't want 'ps' or 'w' to find it).
123 if (strlen(system) > sizeof(PNbuf) - 1)
124 errx(1, "phone number too long (max = %zd bytes)", sizeof PNbuf - 1);
125 strncpy(PNbuf, system, sizeof(PNbuf) - 1);
126 for (p = system; *p; p++)
129 (void)snprintf(sbuf, sizeof(sbuf), "tip%ld", BR);
133 (void)signal(SIGINT, cleanup);
134 (void)signal(SIGQUIT, cleanup);
135 (void)signal(SIGHUP, cleanup);
136 (void)signal(SIGTERM, cleanup);
137 (void)signal(SIGUSR1, tipdone);
139 if ((i = hunt(system)) == 0) {
140 printf("all ports busy\n");
144 printf("link down\n");
145 (void)uu_unlock(uucplock);
148 setbuf(stdout, NULL);
152 * Kludge, their's no easy way to get the initialization
153 * in the right order, so force it here
155 if ((PH = getenv("PHONES")) == NULL)
157 vinit(); /* init variables */
158 setparity("even"); /* set the parity table */
159 if ((i = speed(number(value(BAUDRATE)))) == 0) {
160 printf("tip: bad baud rate %d\n", number(value(BAUDRATE)));
161 (void)uu_unlock(uucplock);
166 * Now that we have the logfile and the ACU open
167 * return to the real uid and gid. These things will
168 * be closed on exit. Swap real and effective uid's
169 * so we can get the original permissions back
170 * for removing the uucp lock.
175 * Hardwired connections require the
176 * line speed set before they make any transmissions
177 * (this is particularly true of things like a DF03-AC)
181 if ((p = connect())) {
182 printf("\07%s\n[EOT]\n", p);
184 (void)uu_unlock(uucplock);
191 * From here down the code is shared with
192 * the "cu" version of tip.
195 tcgetattr (0, &otermios);
197 ctermios.c_iflag = (IMAXBEL|IXANY|ISTRIP|IXON|BRKINT);
198 ctermios.c_lflag = (PENDIN|IEXTEN|ISIG|ECHOCTL|ECHOE|ECHOKE);
199 ctermios.c_cflag = (CLOCAL|HUPCL|CREAD|CS8);
200 ctermios.c_cc[VINTR] = ctermios.c_cc[VQUIT] = -1;
201 ctermios.c_cc[VSUSP] = ctermios.c_cc[VDSUSP] = ctermios.c_cc[VDISCARD] =
202 ctermios.c_cc[VLNEXT] = -1;
205 pipe(fildes); pipe(repdes);
206 (void)signal(SIGALRM, timeoutfunc);
209 * Everything's set up now:
210 * connection established (hardwired or dialup)
211 * line conditioned (baud rate, mode, etc.)
212 * internal data structures (variables)
213 * so, fork one process for local side and one for remote.
215 printf(cumode ? "Connected\r\n" : "\07connected\r\n");
217 if (LI != NULL && tiplink (LI, 0) != 0) {
218 tipabort ("login failed");
231 fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n");
249 (void)uu_unlock(uucplock);
259 * Muck with user ID's. We are setuid to the owner of the lock
260 * directory when we start. user_uid() reverses real and effective
261 * ID's after startup, to run with the user's permissions.
262 * daemon_uid() switches back to the privileged uid for unlocking.
263 * Finally, to avoid running a shell with the wrong real uid,
264 * shell_uid() sets real and effective uid's to the user's real ID.
266 static int uidswapped;
271 if (uidswapped == 0) {
294 * put the controlling keyboard into raw mode
299 tcsetattr (0, TCSANOW, &ctermios);
304 * return keyboard to normal mode
309 tcsetattr (0, TCSANOW, &otermios);
312 static jmp_buf promptbuf;
315 * Print string ``s'', then read a string
316 * in from the terminal. Handles signals & allows use of
317 * normal erase and kill characters.
320 prompt(char *s, char *p, size_t sz)
326 oint = signal(SIGINT, intprompt);
327 oquit = signal(SIGQUIT, SIG_IGN);
330 if (setjmp(promptbuf) == 0)
331 while ((*p = getchar()) != EOF && *p != '\n' && --sz > 0)
336 (void)signal(SIGINT, oint);
337 (void)signal(SIGQUIT, oquit);
338 return (stoprompt || p == b);
342 * Interrupt service routine during prompting
348 (void)signal(SIGINT, SIG_IGN);
351 longjmp(promptbuf, 1);
355 * ****TIPIN TIPIN****
366 * Kinda klugey here...
367 * check for scripting being turned on from the .tiprc file,
368 * but be careful about just using setscript(), as we may
369 * send a SIGEMT before tipout has a chance to set up catching
370 * it; so wait a second, then setscript()
372 if (boolean(value(SCRIPT))) {
382 if ((gch == character(value(ESCAPE))) && bol) {
383 if (!(gch = escape()))
385 } else if (!cumode && gch == character(value(RAISECHAR))) {
386 boolean(value(RAISE)) = !boolean(value(RAISE));
388 } else if (gch == '\r') {
390 xpwrite(FD, &gch, 1);
391 if (boolean(value(HALFDUPLEX)))
394 } else if (!cumode && gch == character(value(FORCE))) {
400 bol = any(gch, value(EOL));
401 if (boolean(value(RAISE)) && islower(gch))
403 xpwrite(FD, &gch, 1);
404 if (boolean(value(HALFDUPLEX)))
409 extern esctable_t etable[];
413 * called on recognition of ``escapec'' at the beginning of a line
420 char c = character(value(ESCAPE));
427 for (p = etable; p->e_char; p++)
428 if (p->e_char == gch) {
429 if ((p->e_flags&PRIV) && uid)
431 printf("%s", ctrl(c));
435 /* ESCAPE ESCAPE forces ESCAPE */
469 static char buf[256];
470 char *p = buf, c, *q;
473 for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
475 *p++ = '\\'; *p++ = *q;
479 *p++ = '^'; *p++ = c + 'A'-1;
480 } else if (c == 0177) {
481 *p++ = '^'; *p++ = '?';
496 if (c < 040 || c == 0177) {
498 s[1] = c == 0177 ? '?' : c+'A'-1;
516 for (p = etable; p->e_char; p++) {
517 if ((p->e_flags&PRIV) && uid)
519 printf("%2s", ctrl(character(value(ESCAPE))));
520 printf("%-2s %c %s\r\n", ctrl(p->e_char),
521 (p->e_flags&EXP) ? '*': ' ', p->e_help);
526 * Set up the "remote" tty's state
531 struct termios termios;
532 tcgetattr (FD, &termios);
533 if (boolean(value(TAND)))
534 termios.c_iflag = IXOFF;
537 termios.c_lflag = (PENDIN|ECHOKE|ECHOE);
538 termios.c_cflag = (CLOCAL|HUPCL|CREAD|CS8);
539 termios.c_ispeed = termios.c_ospeed = speed;
540 tcsetattr (FD, TCSANOW, &termios);
544 * Return "simple" name from a file name,
545 * strip leading directories.
558 static char partab[0200];
562 * Do a write to the remote machine with the correct parity.
563 * We are doing 8 bit wide output, so we just generate a character
564 * with the right parity and output it.
567 xpwrite(int fd, char *buf, int n)
574 for (i = 0; i < n; i++) {
575 *bp = partab[(*bp) & 0177];
578 if (write(fd, buf, n) < 0) {
580 tipabort("Lost carrier.");
582 tipabort("tty not available.");
583 tipabort("Something wrong...");
588 * Build a parity table with appropriate high-order bit.
591 setparity(char *defparity)
593 int i, flip, clr, set;
595 extern char evenpartab[];
597 if (value(PARITY) == NULL)
598 value(PARITY) = defparity;
599 parity = value(PARITY);
600 if (equal(parity, "none")) {
608 if (equal(parity, "odd"))
609 flip = 0200; /* reverse bit 7 */
610 else if (equal(parity, "zero"))
611 clr = 0177; /* turn off bit 7 */
612 else if (equal(parity, "one"))
613 set = 0200; /* turn on bit 7 */
614 else if (!equal(parity, "even")) {
615 (void) fprintf(stderr, "%s: unknown parity value\r\n", parity);
616 (void) fflush(stderr);
618 for (i = 0; i < 0200; i++)
619 partab[i] = (evenpartab[i] ^ flip) | (set & clr);