602 lines
12 KiB
C
602 lines
12 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1983, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)tip.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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/*
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* tip - UNIX link to other systems
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* tip [-v] [-speed] system-name
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* or
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* cu phone-number [-s speed] [-l line] [-a acu]
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*/
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#include "tip.h"
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#include "pathnames.h"
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/*
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* Baud rate mapping table
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*/
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int bauds[] = {
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0, 50, 75, 110, 134, 150, 200, 300, 600,
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1200, 1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200, -1
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};
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int disc = OTTYDISC; /* tip normally runs this way */
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void intprompt();
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void timeout();
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void cleanup();
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char *sname();
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char PNbuf[256]; /* This limits the size of a number */
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main(argc, argv)
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char *argv[];
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{
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char *system = NOSTR;
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register int i;
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register char *p;
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char sbuf[12];
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gid = getgid();
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egid = getegid();
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uid = getuid();
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euid = geteuid();
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if (equal(sname(argv[0]), "cu")) {
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cumode = 1;
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cumain(argc, argv);
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goto cucommon;
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}
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if (argc > 4) {
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fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n");
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exit(1);
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}
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if (!isatty(0)) {
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fprintf(stderr, "tip: must be interactive\n");
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exit(1);
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}
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for (; argc > 1; argv++, argc--) {
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if (argv[1][0] != '-')
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system = argv[1];
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else switch (argv[1][1]) {
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case 'v':
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vflag++;
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break;
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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BR = atoi(&argv[1][1]);
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break;
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default:
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fprintf(stderr, "tip: %s, unknown option\n", argv[1]);
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break;
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}
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}
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if (system == NOSTR)
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goto notnumber;
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if (isalpha(*system))
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goto notnumber;
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/*
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* System name is really a phone number...
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* Copy the number then stomp on the original (in case the number
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* is private, we don't want 'ps' or 'w' to find it).
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*/
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if (strlen(system) > sizeof PNbuf - 1) {
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fprintf(stderr, "tip: phone number too long (max = %d bytes)\n",
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sizeof PNbuf - 1);
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exit(1);
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}
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strncpy( PNbuf, system, sizeof PNbuf - 1 );
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for (p = system; *p; p++)
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*p = '\0';
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PN = PNbuf;
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(void)sprintf(sbuf, "tip%d", BR);
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system = sbuf;
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notnumber:
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(void)signal(SIGINT, cleanup);
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(void)signal(SIGQUIT, cleanup);
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(void)signal(SIGHUP, cleanup);
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(void)signal(SIGTERM, cleanup);
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if ((i = hunt(system)) == 0) {
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printf("all ports busy\n");
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exit(3);
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}
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if (i == -1) {
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printf("link down\n");
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(void)uu_unlock(uucplock);
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exit(3);
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}
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setbuf(stdout, NULL);
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loginit();
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/*
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* Kludge, their's no easy way to get the initialization
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* in the right order, so force it here
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*/
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if ((PH = getenv("PHONES")) == NOSTR)
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PH = _PATH_PHONES;
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vinit(); /* init variables */
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setparity("even"); /* set the parity table */
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if ((i = speed(number(value(BAUDRATE)))) == NULL) {
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printf("tip: bad baud rate %d\n", number(value(BAUDRATE)));
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(void)uu_unlock(uucplock);
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exit(3);
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}
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/*
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* Now that we have the logfile and the ACU open
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* return to the real uid and gid. These things will
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* be closed on exit. Swap real and effective uid's
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* so we can get the original permissions back
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* for removing the uucp lock.
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*/
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user_uid();
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/*
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* Hardwired connections require the
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* line speed set before they make any transmissions
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* (this is particularly true of things like a DF03-AC)
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*/
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if (HW)
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ttysetup(i);
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if (p = connect()) {
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printf("\07%s\n[EOT]\n", p);
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daemon_uid();
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(void)uu_unlock(uucplock);
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exit(1);
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}
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if (!HW)
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ttysetup(i);
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cucommon:
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/*
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* From here down the code is shared with
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* the "cu" version of tip.
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*/
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ioctl(0, TIOCGETP, (char *)&defarg);
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ioctl(0, TIOCGETC, (char *)&defchars);
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ioctl(0, TIOCGLTC, (char *)&deflchars);
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ioctl(0, TIOCGETD, (char *)&odisc);
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arg = defarg;
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arg.sg_flags = ANYP | CBREAK;
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tchars = defchars;
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tchars.t_intrc = tchars.t_quitc = -1;
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ltchars = deflchars;
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ltchars.t_suspc = ltchars.t_dsuspc = ltchars.t_flushc
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= ltchars.t_lnextc = -1;
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raw();
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pipe(fildes); pipe(repdes);
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(void)signal(SIGALRM, timeout);
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/*
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* Everything's set up now:
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* connection established (hardwired or dialup)
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* line conditioned (baud rate, mode, etc.)
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* internal data structures (variables)
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* so, fork one process for local side and one for remote.
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*/
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printf(cumode ? "Connected\r\n" : "\07connected\r\n");
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if (pid = fork())
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tipin();
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else
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tipout();
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/*NOTREACHED*/
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}
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void
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cleanup()
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{
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daemon_uid();
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(void)uu_unlock(uucplock);
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if (odisc)
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ioctl(0, TIOCSETD, (char *)&odisc);
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exit(0);
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}
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/*
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* Muck with user ID's. We are setuid to the owner of the lock
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* directory when we start. user_uid() reverses real and effective
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* ID's after startup, to run with the user's permissions.
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* daemon_uid() switches back to the privileged uid for unlocking.
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* Finally, to avoid running a shell with the wrong real uid,
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* shell_uid() sets real and effective uid's to the user's real ID.
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*/
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static int uidswapped;
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user_uid()
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{
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if (uidswapped == 0) {
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seteuid(uid);
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uidswapped = 1;
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}
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}
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daemon_uid()
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{
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if (uidswapped) {
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seteuid(euid);
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uidswapped = 0;
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}
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}
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shell_uid()
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{
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seteuid(uid);
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}
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/*
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* put the controlling keyboard into raw mode
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*/
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raw()
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{
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ioctl(0, TIOCSETP, &arg);
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ioctl(0, TIOCSETC, &tchars);
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ioctl(0, TIOCSLTC, <chars);
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ioctl(0, TIOCSETD, (char *)&disc);
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}
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/*
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* return keyboard to normal mode
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*/
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unraw()
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{
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ioctl(0, TIOCSETD, (char *)&odisc);
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ioctl(0, TIOCSETP, (char *)&defarg);
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ioctl(0, TIOCSETC, (char *)&defchars);
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ioctl(0, TIOCSLTC, (char *)&deflchars);
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}
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static jmp_buf promptbuf;
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/*
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* Print string ``s'', then read a string
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* in from the terminal. Handles signals & allows use of
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* normal erase and kill characters.
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*/
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prompt(s, p)
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char *s;
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register char *p;
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{
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register char *b = p;
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sig_t oint, oquit;
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stoprompt = 0;
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oint = signal(SIGINT, intprompt);
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oquit = signal(SIGQUIT, SIG_IGN);
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unraw();
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printf("%s", s);
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if (setjmp(promptbuf) == 0)
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while ((*p = getchar()) != EOF && *p != '\n')
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p++;
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*p = '\0';
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raw();
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(void)signal(SIGINT, oint);
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(void)signal(SIGQUIT, oquit);
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return (stoprompt || p == b);
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}
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/*
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* Interrupt service routine during prompting
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*/
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void
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intprompt()
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{
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(void)signal(SIGINT, SIG_IGN);
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stoprompt = 1;
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printf("\r\n");
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longjmp(promptbuf, 1);
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}
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/*
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* ****TIPIN TIPIN****
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*/
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tipin()
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{
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char gch, bol = 1;
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/*
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* Kinda klugey here...
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* check for scripting being turned on from the .tiprc file,
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* but be careful about just using setscript(), as we may
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* send a SIGEMT before tipout has a chance to set up catching
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* it; so wait a second, then setscript()
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*/
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if (boolean(value(SCRIPT))) {
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sleep(1);
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setscript();
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}
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while (1) {
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gch = getchar()&0177;
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if ((gch == character(value(ESCAPE))) && bol) {
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if (!(gch = escape()))
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continue;
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} else if (!cumode && gch == character(value(RAISECHAR))) {
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boolean(value(RAISE)) = !boolean(value(RAISE));
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continue;
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} else if (gch == '\r') {
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bol = 1;
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pwrite(FD, &gch, 1);
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if (boolean(value(HALFDUPLEX)))
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printf("\r\n");
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continue;
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} else if (!cumode && gch == character(value(FORCE)))
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gch = getchar()&0177;
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bol = any(gch, value(EOL));
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if (boolean(value(RAISE)) && islower(gch))
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gch = toupper(gch);
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pwrite(FD, &gch, 1);
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if (boolean(value(HALFDUPLEX)))
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printf("%c", gch);
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}
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}
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extern esctable_t etable[];
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/*
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* Escape handler --
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* called on recognition of ``escapec'' at the beginning of a line
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*/
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escape()
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{
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register char gch;
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register esctable_t *p;
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char c = character(value(ESCAPE));
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gch = (getchar()&0177);
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for (p = etable; p->e_char; p++)
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if (p->e_char == gch) {
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if ((p->e_flags&PRIV) && uid)
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continue;
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printf("%s", ctrl(c));
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(*p->e_func)(gch);
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return (0);
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}
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/* ESCAPE ESCAPE forces ESCAPE */
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if (c != gch)
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pwrite(FD, &c, 1);
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return (gch);
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}
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speed(n)
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int n;
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{
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register int *p;
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for (p = bauds; *p != -1; p++)
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if (*p == n)
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return (p - bauds);
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return (NULL);
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}
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any(c, p)
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register char c, *p;
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{
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while (p && *p)
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if (*p++ == c)
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return (1);
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return (0);
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}
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size(s)
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register char *s;
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{
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register int i = 0;
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while (s && *s++)
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i++;
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return (i);
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}
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char *
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interp(s)
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register char *s;
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{
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static char buf[256];
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register char *p = buf, c, *q;
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while (c = *s++) {
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for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++)
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if (*q++ == c) {
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*p++ = '\\'; *p++ = *q;
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goto next;
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}
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if (c < 040) {
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*p++ = '^'; *p++ = c + 'A'-1;
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} else if (c == 0177) {
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*p++ = '^'; *p++ = '?';
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} else
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*p++ = c;
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next:
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;
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}
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*p = '\0';
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return (buf);
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}
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char *
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ctrl(c)
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char c;
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{
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static char s[3];
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if (c < 040 || c == 0177) {
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s[0] = '^';
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s[1] = c == 0177 ? '?' : c+'A'-1;
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s[2] = '\0';
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} else {
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s[0] = c;
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s[1] = '\0';
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}
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return (s);
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}
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/*
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* Help command
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*/
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help(c)
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char c;
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{
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register esctable_t *p;
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printf("%c\r\n", c);
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for (p = etable; p->e_char; p++) {
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if ((p->e_flags&PRIV) && uid)
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continue;
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printf("%2s", ctrl(character(value(ESCAPE))));
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printf("%-2s %c %s\r\n", ctrl(p->e_char),
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p->e_flags&EXP ? '*': ' ', p->e_help);
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}
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}
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/*
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* Set up the "remote" tty's state
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*/
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ttysetup(speed)
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int speed;
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{
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unsigned bits = LDECCTQ;
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arg.sg_ispeed = arg.sg_ospeed = speed;
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arg.sg_flags = RAW;
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if (boolean(value(TAND)))
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arg.sg_flags |= TANDEM;
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ioctl(FD, TIOCSETP, (char *)&arg);
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ioctl(FD, TIOCLBIS, (char *)&bits);
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}
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/*
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* Return "simple" name from a file name,
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* strip leading directories.
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*/
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char *
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sname(s)
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register char *s;
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{
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register char *p = s;
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while (*s)
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if (*s++ == '/')
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p = s;
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return (p);
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}
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static char partab[0200];
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static int bits8;
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/*
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* Do a write to the remote machine with the correct parity.
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* We are doing 8 bit wide output, so we just generate a character
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* with the right parity and output it.
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*/
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pwrite(fd, buf, n)
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int fd;
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char *buf;
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register int n;
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{
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register int i;
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register char *bp;
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extern int errno;
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bp = buf;
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if (bits8 == 0)
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for (i = 0; i < n; i++) {
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*bp = partab[(*bp) & 0177];
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bp++;
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}
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if (write(fd, buf, n) < 0) {
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if (errno == EIO)
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tipabort("Lost carrier.");
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if (errno == ENODEV)
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tipabort("tty not available.");
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/* this is questionable */
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perror("write");
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}
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}
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/*
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* Build a parity table with appropriate high-order bit.
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*/
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setparity(defparity)
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char *defparity;
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{
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register int i, flip, clr, set;
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|
char *parity;
|
|
extern char evenpartab[];
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|
|
|
if (value(PARITY) == NOSTR)
|
|
value(PARITY) = defparity;
|
|
parity = value(PARITY);
|
|
if (equal(parity, "none")) {
|
|
bits8 = 1;
|
|
return;
|
|
}
|
|
bits8 = 0;
|
|
flip = 0;
|
|
clr = 0377;
|
|
set = 0;
|
|
if (equal(parity, "odd"))
|
|
flip = 0200; /* reverse bit 7 */
|
|
else if (equal(parity, "zero"))
|
|
clr = 0177; /* turn off bit 7 */
|
|
else if (equal(parity, "one"))
|
|
set = 0200; /* turn on bit 7 */
|
|
else if (!equal(parity, "even")) {
|
|
(void) fprintf(stderr, "%s: unknown parity value\r\n", parity);
|
|
(void) fflush(stderr);
|
|
}
|
|
for (i = 0; i < 0200; i++)
|
|
partab[i] = evenpartab[i] ^ flip | set & clr;
|
|
}
|