710 lines
15 KiB
C
710 lines
15 KiB
C
/*
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* Copyright (c) 1983, 1990, 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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/*
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* rlogin - remote login
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*/
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#include "bsd_locl.h"
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RCSID("$Id: rlogin.c,v 1.65 1999/03/13 21:13:54 assar Exp $");
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CREDENTIALS cred;
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Key_schedule schedule;
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int use_kerberos = 1, doencrypt;
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char dst_realm_buf[REALM_SZ], *dest_realm = NULL;
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#ifndef CCEQ
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#define c2uc(x) ((unsigned char) x)
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#define CCEQ__(val, c) (c == val ? val != c2uc(_POSIX_VDISABLE) : 0)
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#define CCEQ(val, c) CCEQ__(c2uc(val), c2uc(c))
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#endif
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int eight, rem;
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struct termios deftty;
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int noescape;
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char escapechar = '~';
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struct winsize winsize;
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int parent, rcvcnt;
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char rcvbuf[8 * 1024];
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int child;
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static void
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echo(char c)
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{
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char *p;
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char buf[8];
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p = buf;
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c &= 0177;
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*p++ = escapechar;
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if (c < ' ') {
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*p++ = '^';
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*p++ = c + '@';
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} else if (c == 0177) {
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*p++ = '^';
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*p++ = '?';
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} else
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*p++ = c;
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*p++ = '\r';
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*p++ = '\n';
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write(STDOUT_FILENO, buf, p - buf);
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}
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static void
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mode(int f)
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{
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struct termios tty;
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switch (f) {
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case 0:
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tcsetattr(0, TCSANOW, &deftty);
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break;
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case 1:
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tcgetattr(0, &deftty);
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tty = deftty;
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/* This is loosely derived from sys/compat/tty_compat.c. */
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tty.c_lflag &= ~(ECHO|ICANON|ISIG|IEXTEN);
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tty.c_iflag &= ~ICRNL;
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tty.c_oflag &= ~OPOST;
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tty.c_cc[VMIN] = 1;
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tty.c_cc[VTIME] = 0;
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if (eight) {
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tty.c_iflag &= IXOFF;
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tty.c_cflag &= ~(CSIZE|PARENB);
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tty.c_cflag |= CS8;
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}
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tcsetattr(0, TCSANOW, &tty);
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break;
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default:
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return;
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}
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}
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static void
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done(int status)
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{
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int w, wstatus;
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mode(0);
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if (child > 0) {
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/* make sure catch_child does not snap it up */
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signal(SIGCHLD, SIG_DFL);
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if (kill(child, SIGKILL) >= 0)
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while ((w = wait(&wstatus)) > 0 && w != child);
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}
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exit(status);
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}
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static
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RETSIGTYPE
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catch_child(int foo)
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{
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int status;
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int pid;
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for (;;) {
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pid = waitpid(-1, &status, WNOHANG|WUNTRACED);
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if (pid == 0)
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return;
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/* if the child (reader) dies, just quit */
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if (pid < 0 || (pid == child && !WIFSTOPPED(status)))
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done(WTERMSIG(status) | WEXITSTATUS(status));
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}
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/* NOTREACHED */
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}
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/*
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* There is a race in the SunOS5 rlogind. If the slave end has not yet
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* been opened by the child when setting tty size the size is reset to
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* zero when the child opens it. Therefore we send the window update
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* twice.
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*/
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static int tty_kludge = 1;
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/* Return the number of OOB bytes processed. */
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static int
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oob_real(void)
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{
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struct termios tty;
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int atmark, n, out, rcvd;
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char waste[BUFSIZ], mark;
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out = O_RDWR;
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rcvd = 0;
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if (recv(rem, &mark, 1, MSG_OOB) < 0) {
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return -1;
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}
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if (mark & TIOCPKT_WINDOW) {
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/* Let server know about window size changes */
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kill(parent, SIGUSR1);
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} else if (tty_kludge) {
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/* Let server know about window size changes */
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kill(parent, SIGUSR1);
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tty_kludge = 0;
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}
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if (!eight && (mark & TIOCPKT_NOSTOP)) {
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tcgetattr(0, &tty);
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tty.c_iflag &= ~IXON;
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tcsetattr(0, TCSANOW, &tty);
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}
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if (!eight && (mark & TIOCPKT_DOSTOP)) {
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tcgetattr(0, &tty);
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tty.c_iflag |= (deftty.c_iflag & IXON);
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tcsetattr(0, TCSANOW, &tty);
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}
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if (mark & TIOCPKT_FLUSHWRITE) {
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#ifdef TCOFLUSH
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tcflush(1, TCOFLUSH);
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#else
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ioctl(1, TIOCFLUSH, (char *)&out);
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#endif
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for (;;) {
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if (ioctl(rem, SIOCATMARK, &atmark) < 0) {
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warn("ioctl");
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break;
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}
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if (atmark)
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break;
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n = read(rem, waste, sizeof (waste));
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if (n <= 0)
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break;
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}
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/*
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* Don't want any pending data to be output, so clear the recv
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* buffer. If we were hanging on a write when interrupted,
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* don't want it to restart. If we were reading, restart
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* anyway.
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*/
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rcvcnt = 0;
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}
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/* oob does not do FLUSHREAD (alas!) */
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return 1;
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}
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/* reader: read from remote: line -> 1 */
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static int
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reader(void)
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{
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int n, remaining;
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char *bufp;
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int kludgep = 1;
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bufp = rcvbuf;
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for (;;) {
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fd_set readfds, exceptfds;
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while ((remaining = rcvcnt - (bufp - rcvbuf)) > 0) {
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n = write(STDOUT_FILENO, bufp, remaining);
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if (n < 0) {
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if (errno != EINTR)
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return (-1);
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continue;
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}
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bufp += n;
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}
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bufp = rcvbuf;
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rcvcnt = 0;
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FD_ZERO (&readfds);
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FD_SET (rem, &readfds);
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FD_ZERO (&exceptfds);
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if (kludgep)
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FD_SET (rem, &exceptfds);
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if (select(rem+1, &readfds, 0, &exceptfds, 0) == -1) {
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if (errno == EINTR)
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continue; /* Got signal */
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else
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errx(1, "select failed mysteriously");
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}
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if (!FD_ISSET(rem, &exceptfds) && !FD_ISSET(rem, &readfds)) {
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warnx("select: nothing to read?");
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continue;
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}
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if (FD_ISSET(rem, &exceptfds)) {
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int foo = oob_real ();
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if (foo >= 1)
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continue; /* First check if there is more OOB data. */
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else if (foo < 0)
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kludgep = 0;
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}
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if (!FD_ISSET(rem, &readfds))
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continue; /* Nothing to read. */
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kludgep = 1;
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#ifndef NOENCRYPTION
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if (doencrypt)
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rcvcnt = des_enc_read(rem, rcvbuf,
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sizeof(rcvbuf),
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schedule, &cred.session);
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else
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#endif
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rcvcnt = read(rem, rcvbuf, sizeof (rcvbuf));
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if (rcvcnt == 0)
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return (0);
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if (rcvcnt < 0) {
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if (errno == EINTR)
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continue;
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warn("read");
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return (-1);
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}
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}
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}
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/*
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* Send the window size to the server via the magic escape
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*/
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static void
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sendwindow(void)
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{
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char obuf[4 + 4 * sizeof (u_int16_t)];
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unsigned short *p;
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p = (u_int16_t *)(obuf + 4);
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obuf[0] = 0377;
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obuf[1] = 0377;
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obuf[2] = 's';
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obuf[3] = 's';
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*p++ = htons(winsize.ws_row);
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*p++ = htons(winsize.ws_col);
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#ifdef HAVE_WS_XPIXEL
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*p++ = htons(winsize.ws_xpixel);
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#else
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*p++ = htons(0);
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#endif
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#ifdef HAVE_WS_YPIXEL
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*p++ = htons(winsize.ws_ypixel);
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#else
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*p++ = htons(0);
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#endif
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#ifndef NOENCRYPTION
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if(doencrypt)
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des_enc_write(rem, obuf, sizeof(obuf), schedule,
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&cred.session);
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else
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#endif
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write(rem, obuf, sizeof(obuf));
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}
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static
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RETSIGTYPE
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sigwinch(int foo)
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{
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struct winsize ws;
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if (get_window_size(0, &ws) == 0 &&
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memcmp(&ws, &winsize, sizeof(ws))) {
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winsize = ws;
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sendwindow();
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}
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}
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static void
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stop(int all)
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{
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mode(0);
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signal(SIGCHLD, SIG_IGN);
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kill(all ? 0 : getpid(), SIGTSTP);
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signal(SIGCHLD, catch_child);
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mode(1);
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#ifdef SIGWINCH
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kill(SIGWINCH, getpid()); /* check for size changes, if caught */
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#endif
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}
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/*
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* writer: write to remote: 0 -> line.
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* ~. terminate
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* ~^Z suspend rlogin process.
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* ~<delayed-suspend char> suspend rlogin process, but leave reader alone.
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*/
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static void
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writer(void)
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{
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int bol, local, n;
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char c;
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bol = 1; /* beginning of line */
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local = 0;
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for (;;) {
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n = read(STDIN_FILENO, &c, 1);
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if (n <= 0) {
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if (n < 0 && errno == EINTR)
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continue;
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break;
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}
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/*
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* If we're at the beginning of the line and recognize a
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* command character, then we echo locally. Otherwise,
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* characters are echo'd remotely. If the command character
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* is doubled, this acts as a force and local echo is
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* suppressed.
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*/
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if (bol) {
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bol = 0;
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if (!noescape && c == escapechar) {
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local = 1;
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continue;
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}
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} else if (local) {
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local = 0;
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if (c == '.' || CCEQ(deftty.c_cc[VEOF], c)) {
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echo(c);
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break;
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}
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if (CCEQ(deftty.c_cc[VSUSP], c)) {
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bol = 1;
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echo(c);
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stop(1);
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continue;
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}
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#ifdef VDSUSP
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/* Is VDSUSP called something else on Linux?
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* Perhaps VDELAY is a better thing? */
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if (CCEQ(deftty.c_cc[VDSUSP], c)) {
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bol = 1;
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echo(c);
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stop(0);
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continue;
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}
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#endif /* VDSUSP */
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if (c != escapechar) {
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#ifndef NOENCRYPTION
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if (doencrypt)
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des_enc_write(rem, &escapechar,1, schedule, &cred.session);
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else
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#endif
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write(rem, &escapechar, 1);
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}
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}
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if (doencrypt) {
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#ifdef NOENCRYPTION
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if (write(rem, &c, 1) == 0) {
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#else
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if (des_enc_write(rem, &c, 1, schedule, &cred.session) == 0) {
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#endif
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warnx("line gone");
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break;
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}
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} else
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if (write(rem, &c, 1) == 0) {
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warnx("line gone");
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break;
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}
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bol = CCEQ(deftty.c_cc[VKILL], c) ||
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CCEQ(deftty.c_cc[VEOF], c) ||
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CCEQ(deftty.c_cc[VINTR], c) ||
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CCEQ(deftty.c_cc[VSUSP], c) ||
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c == '\r' || c == '\n';
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}
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}
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static
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RETSIGTYPE
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lostpeer(int foo)
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{
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signal(SIGPIPE, SIG_IGN);
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warnx("\aconnection closed.\r");
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done(1);
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}
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/*
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* This is called in the parent when the reader process gets the
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* out-of-band (urgent) request to turn on the window-changing
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* protocol. It is signalled from the child(reader).
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*/
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static
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RETSIGTYPE
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sigusr1(int foo)
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{
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/*
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* Now we now daemon supports winsize hack,
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*/
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sendwindow();
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#ifdef SIGWINCH
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signal(SIGWINCH, sigwinch); /* so we start to support it */
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#endif
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SIGRETURN(0);
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}
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static void
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doit(void)
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{
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signal(SIGINT, SIG_IGN);
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signal(SIGHUP, SIG_IGN);
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signal(SIGQUIT, SIG_IGN);
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signal(SIGCHLD, catch_child);
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/*
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* Child sends parent this signal for window size hack.
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*/
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signal(SIGUSR1, sigusr1);
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signal(SIGPIPE, lostpeer);
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mode(1);
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parent = getpid();
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child = fork();
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if (child == -1) {
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warn("fork");
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done(1);
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}
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if (child == 0) {
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signal(SIGCHLD, SIG_IGN);
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signal(SIGTTOU, SIG_IGN);
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if (reader() == 0)
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errx(1, "connection closed.\r");
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sleep(1);
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errx(1, "\aconnection closed.\r");
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}
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writer();
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warnx("closed connection.\r");
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done(0);
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}
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static void
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usage(void)
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{
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fprintf(stderr,
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"usage: rlogin [ -%s]%s[-e char] [ -l username ] host\n",
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"8DEKLdx", " [-k realm] ");
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exit(1);
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}
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static u_int
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getescape(char *p)
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{
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long val;
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int len;
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if ((len = strlen(p)) == 1) /* use any single char, including '\' */
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return ((u_int)*p);
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/* otherwise, \nnn */
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if (*p == '\\' && len >= 2 && len <= 4) {
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val = strtol(++p, NULL, 8);
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for (;;) {
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if (!*++p)
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return ((u_int)val);
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if (*p < '0' || *p > '8')
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break;
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}
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}
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warnx("illegal option value -- e");
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usage();
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return 0;
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}
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int
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main(int argc, char **argv)
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{
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struct passwd *pw;
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int sv_port, user_port = 0;
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int argoff, ch, dflag, Dflag, one, uid;
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char *host, *user, term[1024];
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argoff = dflag = Dflag = 0;
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one = 1;
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host = user = NULL;
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set_progname(argv[0]);
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/* handle "rlogin host flags" */
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if (argc > 2 && argv[1][0] != '-') {
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host = argv[1];
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argoff = 1;
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}
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#define OPTIONS "8DEKLde:k:l:xp:"
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while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != EOF)
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switch(ch) {
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case '8':
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eight = 1;
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break;
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case 'D':
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Dflag = 1;
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break;
|
|
case 'E':
|
|
noescape = 1;
|
|
break;
|
|
case 'K':
|
|
use_kerberos = 0;
|
|
break;
|
|
case 'd':
|
|
dflag = 1;
|
|
break;
|
|
case 'e':
|
|
noescape = 0;
|
|
escapechar = getescape(optarg);
|
|
break;
|
|
case 'k':
|
|
dest_realm = dst_realm_buf;
|
|
strcpy_truncate(dest_realm, optarg, REALM_SZ);
|
|
break;
|
|
case 'l':
|
|
user = optarg;
|
|
break;
|
|
case 'x':
|
|
doencrypt = 1;
|
|
break;
|
|
case 'p': {
|
|
char *endptr;
|
|
|
|
user_port = strtol (optarg, &endptr, 0);
|
|
if (user_port == 0 && optarg == endptr)
|
|
errx (1, "Bad port `%s'", optarg);
|
|
user_port = htons(user_port);
|
|
break;
|
|
}
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
optind += argoff;
|
|
|
|
/* if haven't gotten a host yet, do so */
|
|
if (!host && !(host = argv[optind++]))
|
|
usage();
|
|
|
|
if (argv[optind])
|
|
usage();
|
|
|
|
if (!(pw = k_getpwuid(uid = getuid())))
|
|
errx(1, "unknown user id.");
|
|
if (!user)
|
|
user = pw->pw_name;
|
|
|
|
if (user_port)
|
|
sv_port = user_port;
|
|
else
|
|
sv_port = get_login_port(use_kerberos, doencrypt);
|
|
|
|
{
|
|
char *p = getenv("TERM");
|
|
struct termios tty;
|
|
int i;
|
|
|
|
if (p == NULL)
|
|
p = "network";
|
|
|
|
if (tcgetattr(0, &tty) == 0
|
|
&& (i = speed_t2int (cfgetospeed(&tty))) > 0)
|
|
snprintf (term, sizeof(term),
|
|
"%s/%d",
|
|
p, i);
|
|
else
|
|
snprintf (term, sizeof(term),
|
|
"%s",
|
|
p);
|
|
}
|
|
|
|
get_window_size(0, &winsize);
|
|
|
|
if (use_kerberos) {
|
|
setuid(getuid());
|
|
rem = KSUCCESS;
|
|
errno = 0;
|
|
if (dest_realm == NULL)
|
|
dest_realm = krb_realmofhost(host);
|
|
|
|
if (doencrypt)
|
|
rem = krcmd_mutual(&host, sv_port, user, term, 0,
|
|
dest_realm, &cred, schedule);
|
|
else
|
|
rem = krcmd(&host, sv_port, user, term, 0,
|
|
dest_realm);
|
|
if (rem < 0) {
|
|
int i;
|
|
char **newargv;
|
|
|
|
if (errno == ECONNREFUSED)
|
|
warning("remote host doesn't support Kerberos");
|
|
if (errno == ENOENT)
|
|
warning("can't provide Kerberos auth data");
|
|
newargv = malloc((argc + 2) * sizeof(*newargv));
|
|
if (newargv == NULL)
|
|
err(1, "malloc");
|
|
newargv[0] = argv[0];
|
|
newargv[1] = "-K";
|
|
for(i = 1; i < argc; ++i)
|
|
newargv[i + 1] = argv[i];
|
|
newargv[argc + 1] = NULL;
|
|
execv(_PATH_RLOGIN, newargv);
|
|
}
|
|
} else {
|
|
if (doencrypt)
|
|
errx(1, "the -x flag requires Kerberos authentication.");
|
|
if (geteuid() != 0)
|
|
errx(1, "not installed setuid root, "
|
|
"only root may use non kerberized rlogin");
|
|
rem = rcmd(&host, sv_port, pw->pw_name, user, term, 0);
|
|
}
|
|
|
|
if (rem < 0)
|
|
exit(1);
|
|
|
|
#ifdef HAVE_SETSOCKOPT
|
|
#ifdef SO_DEBUG
|
|
if (dflag &&
|
|
setsockopt(rem, SOL_SOCKET, SO_DEBUG, (void *)&one,
|
|
sizeof(one)) < 0)
|
|
warn("setsockopt");
|
|
#endif
|
|
#ifdef TCP_NODELAY
|
|
if (Dflag &&
|
|
setsockopt(rem, IPPROTO_TCP, TCP_NODELAY, (void *)&one,
|
|
sizeof(one)) < 0)
|
|
warn("setsockopt(TCP_NODELAY)");
|
|
#endif
|
|
#ifdef IP_TOS
|
|
one = IPTOS_LOWDELAY;
|
|
if (setsockopt(rem, IPPROTO_IP, IP_TOS, (void *)&one, sizeof(int)) < 0)
|
|
warn("setsockopt(IP_TOS)");
|
|
#endif /* IP_TOS */
|
|
#endif /* HAVE_SETSOCKOPT */
|
|
|
|
setuid(uid);
|
|
doit();
|
|
return 0;
|
|
}
|