821df508e8
needed.
724 lines
15 KiB
C
724 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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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* Portions of this software were developed for the FreeBSD Project by
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* ThinkSec AS and NAI Labs, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
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* ("CBOSS"), as part of the DARPA CHATS research program.
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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 const char copyright[] =
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"@(#) Copyright (c) 1983, 1990, 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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#if 0
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#ifndef lint
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static const char sccsid[] = "@(#)rlogin.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* rlogin - remote login
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*/
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/wait.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <libutil.h>
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#include <netdb.h>
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#include <paths.h>
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#include <pwd.h>
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#include <setjmp.h>
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#include <termios.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifndef TIOCPKT_WINDOW
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#define TIOCPKT_WINDOW 0x80
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#endif
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/* concession to Sun */
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#ifndef SIGUSR1
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#define SIGUSR1 30
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#endif
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int eight, rem;
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struct termios deftty;
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int family = PF_UNSPEC;
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int noescape;
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u_char escapechar = '~';
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#define get_window_size(fd, wp) ioctl(fd, TIOCGWINSZ, wp)
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struct winsize winsize;
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void catch_child(int);
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void copytochild(int);
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void doit(long) __dead2;
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void done(int) __dead2;
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void echo(char);
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u_int getescape(const char *);
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void lostpeer(int);
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void mode(int);
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void msg(const char *);
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void oob(int);
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int reader(int);
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void sendwindow(void);
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void setsignal(int);
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void sigwinch(int);
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void stop(char);
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void usage(void) __dead2;
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void writer(void);
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void writeroob(int);
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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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struct servent *sp;
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struct termios tty;
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long omask;
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int argoff, ch, dflag, Dflag, one;
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uid_t uid;
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char *host, *localname, *p, *user, term[1024];
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speed_t ospeed;
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struct sockaddr_storage ss;
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socklen_t sslen;
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size_t len, len2;
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int i;
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argoff = dflag = Dflag = 0;
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one = 1;
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host = localname = user = NULL;
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if ((p = rindex(argv[0], '/')))
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++p;
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else
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p = argv[0];
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if (strcmp(p, "rlogin"))
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host = p;
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/* handle "rlogin host flags" */
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if (!host && 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 "468DEde:i:l:"
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while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != -1)
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switch(ch) {
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case '4':
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family = PF_INET;
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break;
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case '6':
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family = PF_INET6;
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break;
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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;
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case 'E':
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noescape = 1;
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break;
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case 'd':
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dflag = 1;
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break;
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case 'e':
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noescape = 0;
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escapechar = getescape(optarg);
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break;
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case 'i':
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if (getuid() != 0)
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errx(1, "-i user: permission denied");
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localname = optarg;
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break;
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case 'l':
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user = optarg;
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break;
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case '?':
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default:
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usage();
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}
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optind += argoff;
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/* if haven't gotten a host yet, do so */
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if (!host && !(host = argv[optind++]))
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usage();
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if (argv[optind])
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usage();
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if (!(pw = getpwuid(uid = getuid())))
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errx(1, "unknown user id");
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if (!user)
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user = pw->pw_name;
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if (!localname)
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localname = pw->pw_name;
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sp = NULL;
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sp = getservbyname("login", "tcp");
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if (sp == NULL)
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errx(1, "login/tcp: unknown service");
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if ((p = getenv("TERM")) != NULL)
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(void)strlcpy(term, p, sizeof(term));
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len = strlen(term);
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if (len < (sizeof(term) - 1) && tcgetattr(0, &tty) == 0) {
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/* start at 2 to include the / */
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for (ospeed = i = cfgetospeed(&tty), len2 = 2; i > 9; len2++)
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i /= 10;
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if (len + len2 < sizeof(term))
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(void)snprintf(term + len, len2 + 1, "/%d", ospeed);
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}
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(void)get_window_size(0, &winsize);
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(void)signal(SIGPIPE, lostpeer);
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/* will use SIGUSR1 for window size hack, so hold it off */
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omask = sigblock(sigmask(SIGURG) | sigmask(SIGUSR1));
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/*
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* We set SIGURG and SIGUSR1 below so that an
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* incoming signal will be held pending rather than being
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* discarded. Note that these routines will be ready to get
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* a signal by the time that they are unblocked below.
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*/
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(void)signal(SIGURG, copytochild);
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(void)signal(SIGUSR1, writeroob);
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rem = rcmd_af(&host, sp->s_port, localname, user, term, 0, family);
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if (rem < 0)
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exit(1);
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if (dflag &&
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setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one, sizeof(one)) < 0)
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warn("setsockopt");
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if (Dflag &&
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setsockopt(rem, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one)) < 0)
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warn("setsockopt NODELAY (ignored)");
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sslen = sizeof(ss);
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one = IPTOS_LOWDELAY;
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if (getsockname(rem, (struct sockaddr *)&ss, &sslen) == 0 &&
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ss.ss_family == AF_INET) {
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if (setsockopt(rem, IPPROTO_IP, IP_TOS, (char *)&one,
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sizeof(int)) < 0)
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warn("setsockopt TOS (ignored)");
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} else
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if (ss.ss_family == AF_INET)
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warn("setsockopt getsockname failed");
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(void)setuid(uid);
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doit(omask);
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/*NOTREACHED*/
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}
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int child;
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void
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doit(long omask)
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{
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(void)signal(SIGINT, SIG_IGN);
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setsignal(SIGHUP);
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setsignal(SIGQUIT);
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mode(1);
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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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if (reader(omask) == 0) {
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msg("connection closed");
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exit(0);
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}
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sleep(1);
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msg("\007connection closed");
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exit(1);
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}
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/*
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* We may still own the socket, and may have a pending SIGURG (or might
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* receive one soon) that we really want to send to the reader. When
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* one of these comes in, the trap copytochild simply copies such
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* signals to the child. We can now unblock SIGURG and SIGUSR1
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* that were set above.
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*/
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(void)sigsetmask(omask);
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(void)signal(SIGCHLD, catch_child);
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writer();
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msg("closed connection");
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done(0);
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}
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/* trap a signal, unless it is being ignored. */
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void
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setsignal(int sig)
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{
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int omask = sigblock(sigmask(sig));
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if (signal(sig, exit) == SIG_IGN)
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(void)signal(sig, SIG_IGN);
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(void)sigsetmask(omask);
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}
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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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(void)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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int dosigwinch;
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/*
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* This is called when the reader process gets the out-of-band (urgent)
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* request to turn on the window-changing protocol.
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*/
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/* ARGSUSED */
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void
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writeroob(int signo __unused)
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{
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if (dosigwinch == 0) {
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sendwindow();
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(void)signal(SIGWINCH, sigwinch);
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}
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dosigwinch = 1;
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}
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/* ARGSUSED */
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void
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catch_child(int signo __unused)
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{
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pid_t pid;
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int status;
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for (;;) {
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pid = wait3(&status, WNOHANG|WUNTRACED, NULL);
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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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* 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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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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CCEQ(deftty.c_cc[VDSUSP], c)) {
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bol = 1;
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echo(c);
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stop(c);
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continue;
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}
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if (c != escapechar)
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(void)write(rem, &escapechar, 1);
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}
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if (write(rem, &c, 1) == 0) {
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msg("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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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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(void)write(STDOUT_FILENO, buf, p - buf);
|
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}
|
|
|
|
void
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stop(char cmdc)
|
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{
|
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mode(0);
|
|
(void)signal(SIGCHLD, SIG_IGN);
|
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(void)kill(CCEQ(deftty.c_cc[VSUSP], cmdc) ? 0 : getpid(), SIGTSTP);
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(void)signal(SIGCHLD, catch_child);
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mode(1);
|
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sigwinch(0); /* check for size changes */
|
|
}
|
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|
|
/* ARGSUSED */
|
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void
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sigwinch(int signo __unused)
|
|
{
|
|
struct winsize ws;
|
|
|
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if (dosigwinch && get_window_size(0, &ws) == 0 &&
|
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bcmp(&ws, &winsize, sizeof(ws))) {
|
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winsize = ws;
|
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sendwindow();
|
|
}
|
|
}
|
|
|
|
/*
|
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* Send the window size to the server via the magic escape
|
|
*/
|
|
void
|
|
sendwindow(void)
|
|
{
|
|
struct winsize *wp;
|
|
char obuf[4 + sizeof (struct winsize)];
|
|
|
|
wp = (struct winsize *)(obuf+4);
|
|
obuf[0] = 0377;
|
|
obuf[1] = 0377;
|
|
obuf[2] = 's';
|
|
obuf[3] = 's';
|
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wp->ws_row = htons(winsize.ws_row);
|
|
wp->ws_col = htons(winsize.ws_col);
|
|
wp->ws_xpixel = htons(winsize.ws_xpixel);
|
|
wp->ws_ypixel = htons(winsize.ws_ypixel);
|
|
|
|
(void)write(rem, obuf, sizeof(obuf));
|
|
}
|
|
|
|
/*
|
|
* reader: read from remote: line -> 1
|
|
*/
|
|
#define READING 1
|
|
#define WRITING 2
|
|
|
|
jmp_buf rcvtop;
|
|
int rcvcnt, rcvstate;
|
|
pid_t ppid;
|
|
char rcvbuf[8 * 1024];
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
oob(int signo __unused)
|
|
{
|
|
struct termios tty;
|
|
int atmark, n, rcvd;
|
|
char waste[BUFSIZ], mark;
|
|
|
|
rcvd = 0;
|
|
while (recv(rem, &mark, 1, MSG_OOB) < 0) {
|
|
switch (errno) {
|
|
case EWOULDBLOCK:
|
|
/*
|
|
* Urgent data not here yet. It may not be possible
|
|
* to send it yet if we are blocked for output and
|
|
* our input buffer is full.
|
|
*/
|
|
if (rcvcnt < (int)sizeof(rcvbuf)) {
|
|
n = read(rem, rcvbuf + rcvcnt,
|
|
sizeof(rcvbuf) - rcvcnt);
|
|
if (n <= 0)
|
|
return;
|
|
rcvd += n;
|
|
} else {
|
|
n = read(rem, waste, sizeof(waste));
|
|
if (n <= 0)
|
|
return;
|
|
}
|
|
continue;
|
|
default:
|
|
return;
|
|
}
|
|
}
|
|
if (mark & TIOCPKT_WINDOW) {
|
|
/* Let server know about window size changes */
|
|
(void)kill(ppid, SIGUSR1);
|
|
}
|
|
if (!eight && (mark & TIOCPKT_NOSTOP)) {
|
|
(void)tcgetattr(0, &tty);
|
|
tty.c_iflag &= ~IXON;
|
|
(void)tcsetattr(0, TCSANOW, &tty);
|
|
}
|
|
if (!eight && (mark & TIOCPKT_DOSTOP)) {
|
|
(void)tcgetattr(0, &tty);
|
|
tty.c_iflag |= (deftty.c_iflag & IXON);
|
|
(void)tcsetattr(0, TCSANOW, &tty);
|
|
}
|
|
if (mark & TIOCPKT_FLUSHWRITE) {
|
|
(void)tcflush(1, TCIOFLUSH);
|
|
for (;;) {
|
|
if (ioctl(rem, SIOCATMARK, &atmark) < 0) {
|
|
warn("ioctl");
|
|
break;
|
|
}
|
|
if (atmark)
|
|
break;
|
|
n = read(rem, waste, sizeof (waste));
|
|
if (n <= 0)
|
|
break;
|
|
}
|
|
/*
|
|
* Don't want any pending data to be output, so clear the recv
|
|
* buffer. If we were hanging on a write when interrupted,
|
|
* don't want it to restart. If we were reading, restart
|
|
* anyway.
|
|
*/
|
|
rcvcnt = 0;
|
|
longjmp(rcvtop, 1);
|
|
}
|
|
|
|
/* oob does not do FLUSHREAD (alas!) */
|
|
|
|
/*
|
|
* If we filled the receive buffer while a read was pending, longjmp
|
|
* to the top to restart appropriately. Don't abort a pending write,
|
|
* however, or we won't know how much was written.
|
|
*/
|
|
if (rcvd && rcvstate == READING)
|
|
longjmp(rcvtop, 1);
|
|
}
|
|
|
|
/* reader: read from remote: line -> 1 */
|
|
int
|
|
reader(int omask)
|
|
{
|
|
int n, remaining;
|
|
char *bufp;
|
|
pid_t pid;
|
|
|
|
pid = getpid();
|
|
(void)signal(SIGTTOU, SIG_IGN);
|
|
(void)signal(SIGURG, oob);
|
|
(void)signal(SIGUSR1, oob); /* When propogating SIGURG from parent */
|
|
ppid = getppid();
|
|
(void)fcntl(rem, F_SETOWN, pid);
|
|
(void)setjmp(rcvtop);
|
|
(void)sigsetmask(omask);
|
|
bufp = rcvbuf;
|
|
for (;;) {
|
|
while ((remaining = rcvcnt - (bufp - rcvbuf)) > 0) {
|
|
rcvstate = WRITING;
|
|
n = write(STDOUT_FILENO, bufp, remaining);
|
|
if (n < 0) {
|
|
if (errno != EINTR)
|
|
return (-1);
|
|
continue;
|
|
}
|
|
bufp += n;
|
|
}
|
|
bufp = rcvbuf;
|
|
rcvcnt = 0;
|
|
rcvstate = READING;
|
|
|
|
rcvcnt = read(rem, rcvbuf, sizeof (rcvbuf));
|
|
if (rcvcnt == 0)
|
|
return (0);
|
|
if (rcvcnt < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
warn("read");
|
|
return (-1);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
mode(int f)
|
|
{
|
|
struct termios tty;
|
|
|
|
switch (f) {
|
|
case 0:
|
|
(void)tcsetattr(0, TCSANOW, &deftty);
|
|
break;
|
|
case 1:
|
|
(void)tcgetattr(0, &deftty);
|
|
tty = deftty;
|
|
/* This is loosely derived from sys/kern/tty_compat.c. */
|
|
tty.c_lflag &= ~(ECHO|ICANON|ISIG|IEXTEN);
|
|
tty.c_iflag &= ~ICRNL;
|
|
tty.c_oflag &= ~OPOST;
|
|
tty.c_cc[VMIN] = 1;
|
|
tty.c_cc[VTIME] = 0;
|
|
if (eight) {
|
|
tty.c_iflag &= IXOFF;
|
|
tty.c_cflag &= ~(CSIZE|PARENB);
|
|
tty.c_cflag |= CS8;
|
|
}
|
|
(void)tcsetattr(0, TCSANOW, &tty);
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
lostpeer(int signo __unused)
|
|
{
|
|
(void)signal(SIGPIPE, SIG_IGN);
|
|
msg("\007connection closed");
|
|
done(1);
|
|
}
|
|
|
|
/* copy SIGURGs to the child process via SIGUSR1. */
|
|
/* ARGSUSED */
|
|
void
|
|
copytochild(int signo __unused)
|
|
{
|
|
(void)kill(child, SIGUSR1);
|
|
}
|
|
|
|
void
|
|
msg(const char *str)
|
|
{
|
|
(void)fprintf(stderr, "rlogin: %s\r\n", str);
|
|
}
|
|
|
|
void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr,
|
|
"usage: rlogin [-46%s]%s[-e char] [-i localname] [-l username] host\n",
|
|
"8DEd", " ");
|
|
exit(1);
|
|
}
|
|
|
|
u_int
|
|
getescape(const char *p)
|
|
{
|
|
long val;
|
|
size_t len;
|
|
|
|
if ((len = strlen(p)) == 1) /* use any single char, including '\' */
|
|
return ((u_int)*p);
|
|
/* otherwise, \nnn */
|
|
if (*p == '\\' && len >= 2 && len <= 4) {
|
|
val = strtol(++p, NULL, 8);
|
|
for (;;) {
|
|
if (!*++p)
|
|
return ((u_int)val);
|
|
if (*p < '0' || *p > '8')
|
|
break;
|
|
}
|
|
}
|
|
msg("illegal option value -- e");
|
|
usage();
|
|
/* NOTREACHED */
|
|
}
|