1365 lines
33 KiB
C
1365 lines
33 KiB
C
/*
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* Copyright (c) 1989, 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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#include "telnetd.h"
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RCSID("$Id: telnetd.c,v 1.64 2001/02/08 16:06:27 assar Exp $");
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#ifdef _SC_CRAY_SECURE_SYS
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#include <sys/sysv.h>
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#include <sys/secdev.h>
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#include <sys/secparm.h>
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#include <sys/usrv.h>
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int secflag;
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char tty_dev[16];
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struct secdev dv;
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struct sysv sysv;
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struct socksec ss;
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#endif /* _SC_CRAY_SECURE_SYS */
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#ifdef AUTHENTICATION
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int auth_level = 0;
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#endif
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extern int utmp_len;
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int registerd_host_only = 0;
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#ifdef STREAMSPTY
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# include <stropts.h>
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# include <termios.h>
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#ifdef HAVE_SYS_UIO_H
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#include <sys/uio.h>
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#endif /* HAVE_SYS_UIO_H */
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#ifdef HAVE_SYS_STREAM_H
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#include <sys/stream.h>
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#endif
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#ifdef _AIX
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#include <sys/termio.h>
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#endif
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# ifdef HAVE_SYS_STRTTY_H
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# include <sys/strtty.h>
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# endif
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# ifdef HAVE_SYS_STR_TTY_H
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# include <sys/str_tty.h>
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# endif
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/* make sure we don't get the bsd version */
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/* what is this here for? solaris? /joda */
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# ifdef HAVE_SYS_TTY_H
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# include "/usr/include/sys/tty.h"
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# endif
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# ifdef HAVE_SYS_PTYVAR_H
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# include <sys/ptyvar.h>
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# endif
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/*
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* Because of the way ptyibuf is used with streams messages, we need
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* ptyibuf+1 to be on a full-word boundary. The following wierdness
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* is simply to make that happen.
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*/
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long ptyibufbuf[BUFSIZ/sizeof(long)+1];
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char *ptyibuf = ((char *)&ptyibufbuf[1])-1;
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char *ptyip = ((char *)&ptyibufbuf[1])-1;
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char ptyibuf2[BUFSIZ];
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unsigned char ctlbuf[BUFSIZ];
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struct strbuf strbufc, strbufd;
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int readstream(int, char*, int);
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#else /* ! STREAMPTY */
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/*
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* I/O data buffers,
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* pointers, and counters.
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*/
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char ptyibuf[BUFSIZ], *ptyip = ptyibuf;
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char ptyibuf2[BUFSIZ];
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#endif /* ! STREAMPTY */
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int hostinfo = 1; /* do we print login banner? */
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#ifdef _CRAY
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extern int newmap; /* nonzero if \n maps to ^M^J */
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int lowpty = 0, highpty; /* low, high pty numbers */
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#endif /* CRAY */
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int debug = 0;
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int keepalive = 1;
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char *progname;
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static void usage (void);
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/*
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* The string to pass to getopt(). We do it this way so
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* that only the actual options that we support will be
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* passed off to getopt().
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*/
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char valid_opts[] = "Bd:hklnS:u:UL:y"
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#ifdef AUTHENTICATION
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"a:X:z"
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#endif
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#ifdef DIAGNOSTICS
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"D:"
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#endif
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#ifdef _CRAY
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"r:"
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#endif
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;
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static void doit(struct sockaddr*, int);
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int
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main(int argc, char **argv)
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{
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struct sockaddr_storage __ss;
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struct sockaddr *sa = (struct sockaddr *)&__ss;
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int on = 1;
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socklen_t sa_size;
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int ch;
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#if defined(IPPROTO_IP) && defined(IP_TOS)
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int tos = -1;
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#endif
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#ifdef ENCRYPTION
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extern int des_check_key;
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des_check_key = 1; /* Kludge for Mac NCSA telnet 2.6 /bg */
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#endif
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pfrontp = pbackp = ptyobuf;
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netip = netibuf;
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nfrontp = nbackp = netobuf;
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progname = *argv;
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#ifdef ENCRYPTION
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nclearto = 0;
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#endif
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#ifdef _CRAY
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/*
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* Get number of pty's before trying to process options,
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* which may include changing pty range.
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*/
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highpty = getnpty();
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#endif /* CRAY */
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while ((ch = getopt(argc, argv, valid_opts)) != -1) {
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switch(ch) {
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#ifdef AUTHENTICATION
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case 'a':
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/*
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* Check for required authentication level
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*/
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if (strcmp(optarg, "debug") == 0) {
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auth_debug_mode = 1;
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} else if (strcasecmp(optarg, "none") == 0) {
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auth_level = 0;
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} else if (strcasecmp(optarg, "otp") == 0) {
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auth_level = 0;
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require_otp = 1;
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} else if (strcasecmp(optarg, "other") == 0) {
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auth_level = AUTH_OTHER;
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} else if (strcasecmp(optarg, "user") == 0) {
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auth_level = AUTH_USER;
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} else if (strcasecmp(optarg, "valid") == 0) {
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auth_level = AUTH_VALID;
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} else if (strcasecmp(optarg, "off") == 0) {
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/*
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* This hack turns off authentication
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*/
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auth_level = -1;
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} else {
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fprintf(stderr,
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"telnetd: unknown authorization level for -a\n");
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}
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break;
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#endif /* AUTHENTICATION */
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case 'B': /* BFTP mode is not supported any more */
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break;
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case 'd':
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if (strcmp(optarg, "ebug") == 0) {
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debug++;
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break;
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}
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usage();
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/* NOTREACHED */
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break;
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#ifdef DIAGNOSTICS
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case 'D':
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/*
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* Check for desired diagnostics capabilities.
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*/
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if (!strcmp(optarg, "report")) {
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diagnostic |= TD_REPORT|TD_OPTIONS;
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} else if (!strcmp(optarg, "exercise")) {
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diagnostic |= TD_EXERCISE;
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} else if (!strcmp(optarg, "netdata")) {
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diagnostic |= TD_NETDATA;
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} else if (!strcmp(optarg, "ptydata")) {
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diagnostic |= TD_PTYDATA;
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} else if (!strcmp(optarg, "options")) {
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diagnostic |= TD_OPTIONS;
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} else {
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usage();
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/* NOT REACHED */
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}
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break;
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#endif /* DIAGNOSTICS */
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case 'h':
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hostinfo = 0;
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break;
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case 'k': /* Linemode is not supported any more */
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case 'l':
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break;
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case 'n':
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keepalive = 0;
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break;
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#ifdef _CRAY
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case 'r':
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{
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char *strchr();
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char *c;
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/*
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* Allow the specification of alterations
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* to the pty search range. It is legal to
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* specify only one, and not change the
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* other from its default.
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*/
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c = strchr(optarg, '-');
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if (c) {
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*c++ = '\0';
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highpty = atoi(c);
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}
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if (*optarg != '\0')
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lowpty = atoi(optarg);
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if ((lowpty > highpty) || (lowpty < 0) ||
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(highpty > 32767)) {
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usage();
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/* NOT REACHED */
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}
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break;
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}
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#endif /* CRAY */
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case 'S':
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#ifdef HAVE_PARSETOS
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if ((tos = parsetos(optarg, "tcp")) < 0)
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fprintf(stderr, "%s%s%s\n",
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"telnetd: Bad TOS argument '", optarg,
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"'; will try to use default TOS");
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#else
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fprintf(stderr, "%s%s\n", "TOS option unavailable; ",
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"-S flag not supported\n");
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#endif
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break;
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case 'u': {
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char *eptr;
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utmp_len = strtol(optarg, &eptr, 0);
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if (optarg == eptr)
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fprintf(stderr, "telnetd: unknown utmp len (%s)\n", optarg);
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break;
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}
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case 'U':
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registerd_host_only = 1;
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break;
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#ifdef AUTHENTICATION
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case 'X':
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/*
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* Check for invalid authentication types
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*/
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auth_disable_name(optarg);
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break;
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#endif
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case 'y':
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no_warn = 1;
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break;
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#ifdef AUTHENTICATION
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case 'z':
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log_unauth = 1;
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break;
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#endif /* AUTHENTICATION */
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case 'L':
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new_login = optarg;
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break;
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default:
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fprintf(stderr, "telnetd: %c: unknown option\n", ch);
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/* FALLTHROUGH */
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case '?':
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usage();
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/* NOTREACHED */
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}
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}
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argc -= optind;
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argv += optind;
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if (debug) {
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int port = 0;
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struct servent *sp;
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if (argc > 1) {
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usage ();
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} else if (argc == 1) {
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sp = roken_getservbyname (*argv, "tcp");
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if (sp)
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port = sp->s_port;
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else
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port = htons(atoi(*argv));
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} else {
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#ifdef KRB5
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port = krb5_getportbyname (NULL, "telnet", "tcp", 23);
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#else
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port = k_getportbyname("telnet", "tcp", htons(23));
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#endif
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}
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mini_inetd (port);
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} else if (argc > 0) {
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usage();
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/* NOT REACHED */
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}
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#ifdef _SC_CRAY_SECURE_SYS
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secflag = sysconf(_SC_CRAY_SECURE_SYS);
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/*
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* Get socket's security label
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*/
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if (secflag) {
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socklen_t szss = sizeof(ss);
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int sock_multi;
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socklen_t szi = sizeof(int);
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memset(&dv, 0, sizeof(dv));
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if (getsysv(&sysv, sizeof(struct sysv)) != 0)
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fatalperror(net, "getsysv");
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/*
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* Get socket security label and set device values
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* {security label to be set on ttyp device}
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*/
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#ifdef SO_SEC_MULTI /* 8.0 code */
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if ((getsockopt(0, SOL_SOCKET, SO_SECURITY,
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(void *)&ss, &szss) < 0) ||
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(getsockopt(0, SOL_SOCKET, SO_SEC_MULTI,
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(void *)&sock_multi, &szi) < 0))
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fatalperror(net, "getsockopt");
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else {
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dv.dv_actlvl = ss.ss_actlabel.lt_level;
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dv.dv_actcmp = ss.ss_actlabel.lt_compart;
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if (!sock_multi) {
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dv.dv_minlvl = dv.dv_maxlvl = dv.dv_actlvl;
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dv.dv_valcmp = dv.dv_actcmp;
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} else {
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dv.dv_minlvl = ss.ss_minlabel.lt_level;
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dv.dv_maxlvl = ss.ss_maxlabel.lt_level;
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dv.dv_valcmp = ss.ss_maxlabel.lt_compart;
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}
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dv.dv_devflg = 0;
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}
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#else /* SO_SEC_MULTI */ /* 7.0 code */
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if (getsockopt(0, SOL_SOCKET, SO_SECURITY,
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(void *)&ss, &szss) >= 0) {
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dv.dv_actlvl = ss.ss_slevel;
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dv.dv_actcmp = ss.ss_compart;
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dv.dv_minlvl = ss.ss_minlvl;
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dv.dv_maxlvl = ss.ss_maxlvl;
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dv.dv_valcmp = ss.ss_maxcmp;
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}
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#endif /* SO_SEC_MULTI */
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}
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#endif /* _SC_CRAY_SECURE_SYS */
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roken_openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON);
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sa_size = sizeof (__ss);
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if (getpeername(STDIN_FILENO, sa, &sa_size) < 0) {
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fprintf(stderr, "%s: ", progname);
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perror("getpeername");
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_exit(1);
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}
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if (keepalive &&
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setsockopt(STDIN_FILENO, SOL_SOCKET, SO_KEEPALIVE,
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(void *)&on, sizeof (on)) < 0) {
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syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
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}
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#if defined(IPPROTO_IP) && defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
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{
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# ifdef HAVE_GETTOSBYNAME
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struct tosent *tp;
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if (tos < 0 && (tp = gettosbyname("telnet", "tcp")))
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tos = tp->t_tos;
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# endif
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if (tos < 0)
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tos = 020; /* Low Delay bit */
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if (tos
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&& sa->sa_family == AF_INET
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&& (setsockopt(STDIN_FILENO, IPPROTO_IP, IP_TOS,
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(void *)&tos, sizeof(tos)) < 0)
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&& (errno != ENOPROTOOPT) )
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syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
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}
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#endif /* defined(IPPROTO_IP) && defined(IP_TOS) */
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net = STDIN_FILENO;
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doit(sa, sa_size);
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/* NOTREACHED */
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return 0;
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} /* end of main */
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static void
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usage(void)
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{
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fprintf(stderr, "Usage: telnetd");
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#ifdef AUTHENTICATION
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fprintf(stderr, " [-a (debug|other|otp|user|valid|off|none)]\n\t");
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#endif
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fprintf(stderr, " [-debug]");
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#ifdef DIAGNOSTICS
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fprintf(stderr, " [-D (options|report|exercise|netdata|ptydata)]\n\t");
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#endif
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#ifdef AUTHENTICATION
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fprintf(stderr, " [-edebug]");
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#endif
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fprintf(stderr, " [-h]");
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fprintf(stderr, " [-L login]");
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fprintf(stderr, " [-n]");
|
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#ifdef _CRAY
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fprintf(stderr, " [-r[lowpty]-[highpty]]");
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#endif
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fprintf(stderr, "\n\t");
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|
#ifdef HAVE_GETTOSBYNAME
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fprintf(stderr, " [-S tos]");
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|
#endif
|
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#ifdef AUTHENTICATION
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fprintf(stderr, " [-X auth-type] [-y] [-z]");
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#endif
|
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fprintf(stderr, " [-u utmp_hostname_length] [-U]");
|
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fprintf(stderr, " [port]\n");
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exit(1);
|
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}
|
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|
|
/*
|
|
* getterminaltype
|
|
*
|
|
* Ask the other end to send along its terminal type and speed.
|
|
* Output is the variable terminaltype filled in.
|
|
*/
|
|
static unsigned char ttytype_sbbuf[] = {
|
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IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE
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};
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|
|
int
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getterminaltype(char *name, size_t name_sz)
|
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{
|
|
int retval = -1;
|
|
|
|
settimer(baseline);
|
|
#ifdef AUTHENTICATION
|
|
/*
|
|
* Handle the Authentication option before we do anything else.
|
|
*/
|
|
send_do(TELOPT_AUTHENTICATION, 1);
|
|
while (his_will_wont_is_changing(TELOPT_AUTHENTICATION))
|
|
ttloop();
|
|
if (his_state_is_will(TELOPT_AUTHENTICATION)) {
|
|
retval = auth_wait(name, name_sz);
|
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}
|
|
#endif
|
|
|
|
#ifdef ENCRYPTION
|
|
send_will(TELOPT_ENCRYPT, 1);
|
|
send_do(TELOPT_ENCRYPT, 1); /* esc@magic.fi */
|
|
#endif
|
|
send_do(TELOPT_TTYPE, 1);
|
|
send_do(TELOPT_TSPEED, 1);
|
|
send_do(TELOPT_XDISPLOC, 1);
|
|
send_do(TELOPT_NEW_ENVIRON, 1);
|
|
send_do(TELOPT_OLD_ENVIRON, 1);
|
|
while (
|
|
#ifdef ENCRYPTION
|
|
his_do_dont_is_changing(TELOPT_ENCRYPT) ||
|
|
#endif
|
|
his_will_wont_is_changing(TELOPT_TTYPE) ||
|
|
his_will_wont_is_changing(TELOPT_TSPEED) ||
|
|
his_will_wont_is_changing(TELOPT_XDISPLOC) ||
|
|
his_will_wont_is_changing(TELOPT_NEW_ENVIRON) ||
|
|
his_will_wont_is_changing(TELOPT_OLD_ENVIRON)) {
|
|
ttloop();
|
|
}
|
|
#ifdef ENCRYPTION
|
|
/*
|
|
* Wait for the negotiation of what type of encryption we can
|
|
* send with. If autoencrypt is not set, this will just return.
|
|
*/
|
|
if (his_state_is_will(TELOPT_ENCRYPT)) {
|
|
encrypt_wait();
|
|
}
|
|
#endif
|
|
if (his_state_is_will(TELOPT_TSPEED)) {
|
|
static unsigned char sb[] =
|
|
{ IAC, SB, TELOPT_TSPEED, TELQUAL_SEND, IAC, SE };
|
|
|
|
telnet_net_write (sb, sizeof sb);
|
|
DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
|
|
}
|
|
if (his_state_is_will(TELOPT_XDISPLOC)) {
|
|
static unsigned char sb[] =
|
|
{ IAC, SB, TELOPT_XDISPLOC, TELQUAL_SEND, IAC, SE };
|
|
|
|
telnet_net_write (sb, sizeof sb);
|
|
DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
|
|
}
|
|
if (his_state_is_will(TELOPT_NEW_ENVIRON)) {
|
|
static unsigned char sb[] =
|
|
{ IAC, SB, TELOPT_NEW_ENVIRON, TELQUAL_SEND, IAC, SE };
|
|
|
|
telnet_net_write (sb, sizeof sb);
|
|
DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
|
|
}
|
|
else if (his_state_is_will(TELOPT_OLD_ENVIRON)) {
|
|
static unsigned char sb[] =
|
|
{ IAC, SB, TELOPT_OLD_ENVIRON, TELQUAL_SEND, IAC, SE };
|
|
|
|
telnet_net_write (sb, sizeof sb);
|
|
DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2););
|
|
}
|
|
if (his_state_is_will(TELOPT_TTYPE)) {
|
|
|
|
telnet_net_write (ttytype_sbbuf, sizeof ttytype_sbbuf);
|
|
DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2,
|
|
sizeof ttytype_sbbuf - 2););
|
|
}
|
|
if (his_state_is_will(TELOPT_TSPEED)) {
|
|
while (sequenceIs(tspeedsubopt, baseline))
|
|
ttloop();
|
|
}
|
|
if (his_state_is_will(TELOPT_XDISPLOC)) {
|
|
while (sequenceIs(xdisplocsubopt, baseline))
|
|
ttloop();
|
|
}
|
|
if (his_state_is_will(TELOPT_NEW_ENVIRON)) {
|
|
while (sequenceIs(environsubopt, baseline))
|
|
ttloop();
|
|
}
|
|
if (his_state_is_will(TELOPT_OLD_ENVIRON)) {
|
|
while (sequenceIs(oenvironsubopt, baseline))
|
|
ttloop();
|
|
}
|
|
if (his_state_is_will(TELOPT_TTYPE)) {
|
|
char first[256], last[256];
|
|
|
|
while (sequenceIs(ttypesubopt, baseline))
|
|
ttloop();
|
|
|
|
/*
|
|
* If the other side has already disabled the option, then
|
|
* we have to just go with what we (might) have already gotten.
|
|
*/
|
|
if (his_state_is_will(TELOPT_TTYPE) && !terminaltypeok(terminaltype)) {
|
|
strlcpy(first, terminaltype, sizeof(first));
|
|
for(;;) {
|
|
/*
|
|
* Save the unknown name, and request the next name.
|
|
*/
|
|
strlcpy(last, terminaltype, sizeof(last));
|
|
_gettermname();
|
|
if (terminaltypeok(terminaltype))
|
|
break;
|
|
if ((strncmp(last, terminaltype, sizeof(last)) == 0) ||
|
|
his_state_is_wont(TELOPT_TTYPE)) {
|
|
/*
|
|
* We've hit the end. If this is the same as
|
|
* the first name, just go with it.
|
|
*/
|
|
if (strncmp(first, terminaltype, sizeof(first)) == 0)
|
|
break;
|
|
/*
|
|
* Get the terminal name one more time, so that
|
|
* RFC1091 compliant telnets will cycle back to
|
|
* the start of the list.
|
|
*/
|
|
_gettermname();
|
|
if (strncmp(first, terminaltype, sizeof(first)) != 0)
|
|
strcpy(terminaltype, first);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return(retval);
|
|
} /* end of getterminaltype */
|
|
|
|
void
|
|
_gettermname(void)
|
|
{
|
|
/*
|
|
* If the client turned off the option,
|
|
* we can't send another request, so we
|
|
* just return.
|
|
*/
|
|
if (his_state_is_wont(TELOPT_TTYPE))
|
|
return;
|
|
settimer(baseline);
|
|
telnet_net_write (ttytype_sbbuf, sizeof ttytype_sbbuf);
|
|
DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2,
|
|
sizeof ttytype_sbbuf - 2););
|
|
while (sequenceIs(ttypesubopt, baseline))
|
|
ttloop();
|
|
}
|
|
|
|
int
|
|
terminaltypeok(char *s)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
|
|
char host_name[MaxHostNameLen];
|
|
char remote_host_name[MaxHostNameLen];
|
|
char remote_utmp_name[MaxHostNameLen];
|
|
|
|
/*
|
|
* Get a pty, scan input lines.
|
|
*/
|
|
static void
|
|
doit(struct sockaddr *who, int who_len)
|
|
{
|
|
int level;
|
|
int ptynum;
|
|
char user_name[256];
|
|
int error;
|
|
|
|
/*
|
|
* Find an available pty to use.
|
|
*/
|
|
ourpty = getpty(&ptynum);
|
|
if (ourpty < 0)
|
|
fatal(net, "All network ports in use");
|
|
|
|
#ifdef _SC_CRAY_SECURE_SYS
|
|
/*
|
|
* set ttyp line security label
|
|
*/
|
|
if (secflag) {
|
|
char slave_dev[16];
|
|
|
|
snprintf(tty_dev, sizeof(tty_dev), "/dev/pty/%03d", ptynum);
|
|
if (setdevs(tty_dev, &dv) < 0)
|
|
fatal(net, "cannot set pty security");
|
|
snprintf(slave_dev, sizeof(slave_dev), "/dev/ttyp%03d", ptynum);
|
|
if (setdevs(slave_dev, &dv) < 0)
|
|
fatal(net, "cannot set tty security");
|
|
}
|
|
#endif /* _SC_CRAY_SECURE_SYS */
|
|
|
|
error = getnameinfo_verified (who, who_len,
|
|
remote_host_name,
|
|
sizeof(remote_host_name),
|
|
NULL, 0,
|
|
registerd_host_only ? NI_NAMEREQD : 0);
|
|
if (error)
|
|
fatal(net, "Couldn't resolve your address into a host name.\r\n\
|
|
Please contact your net administrator");
|
|
|
|
gethostname(host_name, sizeof (host_name));
|
|
|
|
strlcpy (remote_utmp_name, remote_host_name, sizeof(remote_utmp_name));
|
|
|
|
/* Only trim if too long (and possible) */
|
|
if (strlen(remote_utmp_name) > utmp_len) {
|
|
char *domain = strchr(host_name, '.');
|
|
char *p = strchr(remote_utmp_name, '.');
|
|
if (domain != NULL && p != NULL && (strcmp(p, domain) == 0))
|
|
*p = '\0'; /* remove domain part */
|
|
}
|
|
|
|
/*
|
|
* If hostname still doesn't fit utmp, use ipaddr.
|
|
*/
|
|
if (strlen(remote_utmp_name) > utmp_len) {
|
|
error = getnameinfo (who, who_len,
|
|
remote_utmp_name,
|
|
sizeof(remote_utmp_name),
|
|
NULL, 0,
|
|
NI_NUMERICHOST);
|
|
if (error)
|
|
fatal(net, "Couldn't get numeric address\r\n");
|
|
}
|
|
|
|
#ifdef AUTHENTICATION
|
|
auth_encrypt_init(host_name, remote_host_name, "TELNETD", 1);
|
|
#endif
|
|
|
|
init_env();
|
|
/*
|
|
* get terminal type.
|
|
*/
|
|
*user_name = 0;
|
|
level = getterminaltype(user_name, sizeof(user_name));
|
|
esetenv("TERM", terminaltype ? terminaltype : "network", 1);
|
|
|
|
#ifdef _SC_CRAY_SECURE_SYS
|
|
if (secflag) {
|
|
if (setulvl(dv.dv_actlvl) < 0)
|
|
fatal(net,"cannot setulvl()");
|
|
if (setucmp(dv.dv_actcmp) < 0)
|
|
fatal(net, "cannot setucmp()");
|
|
}
|
|
#endif /* _SC_CRAY_SECURE_SYS */
|
|
|
|
/* begin server processing */
|
|
my_telnet(net, ourpty, remote_host_name, remote_utmp_name,
|
|
level, user_name);
|
|
/*NOTREACHED*/
|
|
} /* end of doit */
|
|
|
|
/* output contents of /etc/issue.net, or /etc/issue */
|
|
static void
|
|
show_issue(void)
|
|
{
|
|
FILE *f;
|
|
char buf[128];
|
|
f = fopen("/etc/issue.net", "r");
|
|
if(f == NULL)
|
|
f = fopen("/etc/issue", "r");
|
|
if(f){
|
|
while(fgets(buf, sizeof(buf)-2, f)){
|
|
strcpy(buf + strcspn(buf, "\r\n"), "\r\n");
|
|
writenet((unsigned char*)buf, strlen(buf));
|
|
}
|
|
fclose(f);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Main loop. Select from pty and network, and
|
|
* hand data to telnet receiver finite state machine.
|
|
*/
|
|
void
|
|
my_telnet(int f, int p, const char *host, const char *utmp_host,
|
|
int level, char *autoname)
|
|
{
|
|
int on = 1;
|
|
char *he;
|
|
char *IM;
|
|
int nfd;
|
|
int startslave_called = 0;
|
|
time_t timeout;
|
|
|
|
/*
|
|
* Initialize the slc mapping table.
|
|
*/
|
|
get_slc_defaults();
|
|
|
|
/*
|
|
* Do some tests where it is desireable to wait for a response.
|
|
* Rather than doing them slowly, one at a time, do them all
|
|
* at once.
|
|
*/
|
|
if (my_state_is_wont(TELOPT_SGA))
|
|
send_will(TELOPT_SGA, 1);
|
|
/*
|
|
* Is the client side a 4.2 (NOT 4.3) system? We need to know this
|
|
* because 4.2 clients are unable to deal with TCP urgent data.
|
|
*
|
|
* To find out, we send out a "DO ECHO". If the remote system
|
|
* answers "WILL ECHO" it is probably a 4.2 client, and we note
|
|
* that fact ("WILL ECHO" ==> that the client will echo what
|
|
* WE, the server, sends it; it does NOT mean that the client will
|
|
* echo the terminal input).
|
|
*/
|
|
send_do(TELOPT_ECHO, 1);
|
|
|
|
/*
|
|
* Send along a couple of other options that we wish to negotiate.
|
|
*/
|
|
send_do(TELOPT_NAWS, 1);
|
|
send_will(TELOPT_STATUS, 1);
|
|
flowmode = 1; /* default flow control state */
|
|
restartany = -1; /* uninitialized... */
|
|
send_do(TELOPT_LFLOW, 1);
|
|
|
|
/*
|
|
* Spin, waiting for a response from the DO ECHO. However,
|
|
* some REALLY DUMB telnets out there might not respond
|
|
* to the DO ECHO. So, we spin looking for NAWS, (most dumb
|
|
* telnets so far seem to respond with WONT for a DO that
|
|
* they don't understand...) because by the time we get the
|
|
* response, it will already have processed the DO ECHO.
|
|
* Kludge upon kludge.
|
|
*/
|
|
while (his_will_wont_is_changing(TELOPT_NAWS))
|
|
ttloop();
|
|
|
|
/*
|
|
* But...
|
|
* The client might have sent a WILL NAWS as part of its
|
|
* startup code; if so, we'll be here before we get the
|
|
* response to the DO ECHO. We'll make the assumption
|
|
* that any implementation that understands about NAWS
|
|
* is a modern enough implementation that it will respond
|
|
* to our DO ECHO request; hence we'll do another spin
|
|
* waiting for the ECHO option to settle down, which is
|
|
* what we wanted to do in the first place...
|
|
*/
|
|
if (his_want_state_is_will(TELOPT_ECHO) &&
|
|
his_state_is_will(TELOPT_NAWS)) {
|
|
while (his_will_wont_is_changing(TELOPT_ECHO))
|
|
ttloop();
|
|
}
|
|
/*
|
|
* On the off chance that the telnet client is broken and does not
|
|
* respond to the DO ECHO we sent, (after all, we did send the
|
|
* DO NAWS negotiation after the DO ECHO, and we won't get here
|
|
* until a response to the DO NAWS comes back) simulate the
|
|
* receipt of a will echo. This will also send a WONT ECHO
|
|
* to the client, since we assume that the client failed to
|
|
* respond because it believes that it is already in DO ECHO
|
|
* mode, which we do not want.
|
|
*/
|
|
if (his_want_state_is_will(TELOPT_ECHO)) {
|
|
DIAG(TD_OPTIONS,
|
|
{output_data("td: simulating recv\r\n");
|
|
});
|
|
willoption(TELOPT_ECHO);
|
|
}
|
|
|
|
/*
|
|
* Finally, to clean things up, we turn on our echo. This
|
|
* will break stupid 4.2 telnets out of local terminal echo.
|
|
*/
|
|
|
|
if (my_state_is_wont(TELOPT_ECHO))
|
|
send_will(TELOPT_ECHO, 1);
|
|
|
|
#ifdef TIOCPKT
|
|
#ifdef STREAMSPTY
|
|
if (!really_stream)
|
|
#endif
|
|
/*
|
|
* Turn on packet mode
|
|
*/
|
|
ioctl(p, TIOCPKT, (char *)&on);
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Call telrcv() once to pick up anything received during
|
|
* terminal type negotiation, 4.2/4.3 determination, and
|
|
* linemode negotiation.
|
|
*/
|
|
telrcv();
|
|
|
|
ioctl(f, FIONBIO, (char *)&on);
|
|
ioctl(p, FIONBIO, (char *)&on);
|
|
|
|
#if defined(SO_OOBINLINE) && defined(HAVE_SETSOCKOPT)
|
|
setsockopt(net, SOL_SOCKET, SO_OOBINLINE,
|
|
(void *)&on, sizeof on);
|
|
#endif /* defined(SO_OOBINLINE) */
|
|
|
|
#ifdef SIGTSTP
|
|
signal(SIGTSTP, SIG_IGN);
|
|
#endif
|
|
#ifdef SIGTTOU
|
|
/*
|
|
* Ignoring SIGTTOU keeps the kernel from blocking us
|
|
* in ttioct() in /sys/tty.c.
|
|
*/
|
|
signal(SIGTTOU, SIG_IGN);
|
|
#endif
|
|
|
|
signal(SIGCHLD, cleanup);
|
|
|
|
#ifdef TIOCNOTTY
|
|
{
|
|
int t;
|
|
t = open(_PATH_TTY, O_RDWR);
|
|
if (t >= 0) {
|
|
ioctl(t, TIOCNOTTY, (char *)0);
|
|
close(t);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
show_issue();
|
|
/*
|
|
* Show banner that getty never gave.
|
|
*
|
|
* We put the banner in the pty input buffer. This way, it
|
|
* gets carriage return null processing, etc., just like all
|
|
* other pty --> client data.
|
|
*/
|
|
|
|
if (getenv("USER"))
|
|
hostinfo = 0;
|
|
|
|
IM = DEFAULT_IM;
|
|
he = 0;
|
|
edithost(he, host_name);
|
|
if (hostinfo && *IM)
|
|
putf(IM, ptyibuf2);
|
|
|
|
if (pcc)
|
|
strncat(ptyibuf2, ptyip, pcc+1);
|
|
ptyip = ptyibuf2;
|
|
pcc = strlen(ptyip);
|
|
|
|
DIAG(TD_REPORT, {
|
|
output_data("td: Entering processing loop\r\n");
|
|
});
|
|
|
|
|
|
nfd = ((f > p) ? f : p) + 1;
|
|
timeout = time(NULL) + 5;
|
|
for (;;) {
|
|
fd_set ibits, obits, xbits;
|
|
int c;
|
|
|
|
/* wait for encryption to be turned on, but don't wait
|
|
indefinitely */
|
|
if(!startslave_called && (!encrypt_delay() || timeout > time(NULL))){
|
|
startslave_called = 1;
|
|
startslave(host, utmp_host, level, autoname);
|
|
}
|
|
|
|
if (ncc < 0 && pcc < 0)
|
|
break;
|
|
|
|
FD_ZERO(&ibits);
|
|
FD_ZERO(&obits);
|
|
FD_ZERO(&xbits);
|
|
|
|
if (f >= FD_SETSIZE
|
|
|| p >= FD_SETSIZE)
|
|
fatal(net, "fd too large");
|
|
|
|
/*
|
|
* Never look for input if there's still
|
|
* stuff in the corresponding output buffer
|
|
*/
|
|
if (nfrontp - nbackp || pcc > 0) {
|
|
FD_SET(f, &obits);
|
|
} else {
|
|
FD_SET(p, &ibits);
|
|
}
|
|
if (pfrontp - pbackp || ncc > 0) {
|
|
FD_SET(p, &obits);
|
|
} else {
|
|
FD_SET(f, &ibits);
|
|
}
|
|
if (!SYNCHing) {
|
|
FD_SET(f, &xbits);
|
|
}
|
|
if ((c = select(nfd, &ibits, &obits, &xbits,
|
|
(struct timeval *)0)) < 1) {
|
|
if (c == -1) {
|
|
if (errno == EINTR) {
|
|
continue;
|
|
}
|
|
}
|
|
sleep(5);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Any urgent data?
|
|
*/
|
|
if (FD_ISSET(net, &xbits)) {
|
|
SYNCHing = 1;
|
|
}
|
|
|
|
/*
|
|
* Something to read from the network...
|
|
*/
|
|
if (FD_ISSET(net, &ibits)) {
|
|
#ifndef SO_OOBINLINE
|
|
/*
|
|
* In 4.2 (and 4.3 beta) systems, the
|
|
* OOB indication and data handling in the kernel
|
|
* is such that if two separate TCP Urgent requests
|
|
* come in, one byte of TCP data will be overlaid.
|
|
* This is fatal for Telnet, but we try to live
|
|
* with it.
|
|
*
|
|
* In addition, in 4.2 (and...), a special protocol
|
|
* is needed to pick up the TCP Urgent data in
|
|
* the correct sequence.
|
|
*
|
|
* What we do is: if we think we are in urgent
|
|
* mode, we look to see if we are "at the mark".
|
|
* If we are, we do an OOB receive. If we run
|
|
* this twice, we will do the OOB receive twice,
|
|
* but the second will fail, since the second
|
|
* time we were "at the mark", but there wasn't
|
|
* any data there (the kernel doesn't reset
|
|
* "at the mark" until we do a normal read).
|
|
* Once we've read the OOB data, we go ahead
|
|
* and do normal reads.
|
|
*
|
|
* There is also another problem, which is that
|
|
* since the OOB byte we read doesn't put us
|
|
* out of OOB state, and since that byte is most
|
|
* likely the TELNET DM (data mark), we would
|
|
* stay in the TELNET SYNCH (SYNCHing) state.
|
|
* So, clocks to the rescue. If we've "just"
|
|
* received a DM, then we test for the
|
|
* presence of OOB data when the receive OOB
|
|
* fails (and AFTER we did the normal mode read
|
|
* to clear "at the mark").
|
|
*/
|
|
if (SYNCHing) {
|
|
int atmark;
|
|
|
|
ioctl(net, SIOCATMARK, (char *)&atmark);
|
|
if (atmark) {
|
|
ncc = recv(net, netibuf, sizeof (netibuf), MSG_OOB);
|
|
if ((ncc == -1) && (errno == EINVAL)) {
|
|
ncc = read(net, netibuf, sizeof (netibuf));
|
|
if (sequenceIs(didnetreceive, gotDM)) {
|
|
SYNCHing = stilloob(net);
|
|
}
|
|
}
|
|
} else {
|
|
ncc = read(net, netibuf, sizeof (netibuf));
|
|
}
|
|
} else {
|
|
ncc = read(net, netibuf, sizeof (netibuf));
|
|
}
|
|
settimer(didnetreceive);
|
|
#else /* !defined(SO_OOBINLINE)) */
|
|
ncc = read(net, netibuf, sizeof (netibuf));
|
|
#endif /* !defined(SO_OOBINLINE)) */
|
|
if (ncc < 0 && errno == EWOULDBLOCK)
|
|
ncc = 0;
|
|
else {
|
|
if (ncc <= 0) {
|
|
break;
|
|
}
|
|
netip = netibuf;
|
|
}
|
|
DIAG((TD_REPORT | TD_NETDATA), {
|
|
output_data("td: netread %d chars\r\n", ncc);
|
|
});
|
|
DIAG(TD_NETDATA, printdata("nd", netip, ncc));
|
|
}
|
|
|
|
/*
|
|
* Something to read from the pty...
|
|
*/
|
|
if (FD_ISSET(p, &ibits)) {
|
|
#ifdef STREAMSPTY
|
|
if (really_stream)
|
|
pcc = readstream(p, ptyibuf, BUFSIZ);
|
|
else
|
|
#endif
|
|
pcc = read(p, ptyibuf, BUFSIZ);
|
|
|
|
/*
|
|
* On some systems, if we try to read something
|
|
* off the master side before the slave side is
|
|
* opened, we get EIO.
|
|
*/
|
|
if (pcc < 0 && (errno == EWOULDBLOCK ||
|
|
#ifdef EAGAIN
|
|
errno == EAGAIN ||
|
|
#endif
|
|
errno == EIO)) {
|
|
pcc = 0;
|
|
} else {
|
|
if (pcc <= 0)
|
|
break;
|
|
if (ptyibuf[0] & TIOCPKT_FLUSHWRITE) {
|
|
netclear(); /* clear buffer back */
|
|
#ifndef NO_URGENT
|
|
/*
|
|
* There are client telnets on some
|
|
* operating systems get screwed up
|
|
* royally if we send them urgent
|
|
* mode data.
|
|
*/
|
|
output_data ("%c%c", IAC, DM);
|
|
|
|
neturg = nfrontp-1; /* off by one XXX */
|
|
DIAG(TD_OPTIONS,
|
|
printoption("td: send IAC", DM));
|
|
|
|
#endif
|
|
}
|
|
if (his_state_is_will(TELOPT_LFLOW) &&
|
|
(ptyibuf[0] &
|
|
(TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))) {
|
|
int newflow =
|
|
ptyibuf[0] & TIOCPKT_DOSTOP ? 1 : 0;
|
|
if (newflow != flowmode) {
|
|
flowmode = newflow;
|
|
output_data("%c%c%c%c%c%c",
|
|
IAC, SB, TELOPT_LFLOW,
|
|
flowmode ? LFLOW_ON
|
|
: LFLOW_OFF,
|
|
IAC, SE);
|
|
DIAG(TD_OPTIONS, printsub('>',
|
|
(unsigned char *)nfrontp-4,
|
|
4););
|
|
}
|
|
}
|
|
pcc--;
|
|
ptyip = ptyibuf+1;
|
|
}
|
|
}
|
|
|
|
while (pcc > 0) {
|
|
if ((&netobuf[BUFSIZ] - nfrontp) < 3)
|
|
break;
|
|
c = *ptyip++ & 0377, pcc--;
|
|
if (c == IAC)
|
|
*nfrontp++ = c;
|
|
*nfrontp++ = c;
|
|
if ((c == '\r') && (my_state_is_wont(TELOPT_BINARY))) {
|
|
if (pcc > 0 && ((*ptyip & 0377) == '\n')) {
|
|
*nfrontp++ = *ptyip++ & 0377;
|
|
pcc--;
|
|
} else
|
|
*nfrontp++ = '\0';
|
|
}
|
|
}
|
|
|
|
if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0)
|
|
netflush();
|
|
if (ncc > 0)
|
|
telrcv();
|
|
if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0)
|
|
ptyflush();
|
|
}
|
|
cleanup(0);
|
|
}
|
|
|
|
#ifndef TCSIG
|
|
# ifdef TIOCSIG
|
|
# define TCSIG TIOCSIG
|
|
# endif
|
|
#endif
|
|
|
|
#ifdef STREAMSPTY
|
|
|
|
int flowison = -1; /* current state of flow: -1 is unknown */
|
|
|
|
int
|
|
readstream(int p, char *ibuf, int bufsize)
|
|
{
|
|
int flags = 0;
|
|
int ret = 0;
|
|
struct termios *tsp;
|
|
#if 0
|
|
struct termio *tp;
|
|
#endif
|
|
struct iocblk *ip;
|
|
char vstop, vstart;
|
|
int ixon;
|
|
int newflow;
|
|
|
|
strbufc.maxlen = BUFSIZ;
|
|
strbufc.buf = (char *)ctlbuf;
|
|
strbufd.maxlen = bufsize-1;
|
|
strbufd.len = 0;
|
|
strbufd.buf = ibuf+1;
|
|
ibuf[0] = 0;
|
|
|
|
ret = getmsg(p, &strbufc, &strbufd, &flags);
|
|
if (ret < 0) /* error of some sort -- probably EAGAIN */
|
|
return(-1);
|
|
|
|
if (strbufc.len <= 0 || ctlbuf[0] == M_DATA) {
|
|
/* data message */
|
|
if (strbufd.len > 0) { /* real data */
|
|
return(strbufd.len + 1); /* count header char */
|
|
} else {
|
|
/* nothing there */
|
|
errno = EAGAIN;
|
|
return(-1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* It's a control message. Return 1, to look at the flag we set
|
|
*/
|
|
|
|
switch (ctlbuf[0]) {
|
|
case M_FLUSH:
|
|
if (ibuf[1] & FLUSHW)
|
|
ibuf[0] = TIOCPKT_FLUSHWRITE;
|
|
return(1);
|
|
|
|
case M_IOCTL:
|
|
ip = (struct iocblk *) (ibuf+1);
|
|
|
|
switch (ip->ioc_cmd) {
|
|
#ifdef TCSETS
|
|
case TCSETS:
|
|
case TCSETSW:
|
|
case TCSETSF:
|
|
tsp = (struct termios *)
|
|
(ibuf+1 + sizeof(struct iocblk));
|
|
vstop = tsp->c_cc[VSTOP];
|
|
vstart = tsp->c_cc[VSTART];
|
|
ixon = tsp->c_iflag & IXON;
|
|
break;
|
|
#endif
|
|
#if 0
|
|
case TCSETA:
|
|
case TCSETAW:
|
|
case TCSETAF:
|
|
tp = (struct termio *) (ibuf+1 + sizeof(struct iocblk));
|
|
vstop = tp->c_cc[VSTOP];
|
|
vstart = tp->c_cc[VSTART];
|
|
ixon = tp->c_iflag & IXON;
|
|
break;
|
|
#endif
|
|
default:
|
|
errno = EAGAIN;
|
|
return(-1);
|
|
}
|
|
|
|
newflow = (ixon && (vstart == 021) && (vstop == 023)) ? 1 : 0;
|
|
if (newflow != flowison) { /* it's a change */
|
|
flowison = newflow;
|
|
ibuf[0] = newflow ? TIOCPKT_DOSTOP : TIOCPKT_NOSTOP;
|
|
return(1);
|
|
}
|
|
}
|
|
|
|
/* nothing worth doing anything about */
|
|
errno = EAGAIN;
|
|
return(-1);
|
|
}
|
|
#endif /* STREAMSPTY */
|
|
|
|
/*
|
|
* Send interrupt to process on other side of pty.
|
|
* If it is in raw mode, just write NULL;
|
|
* otherwise, write intr char.
|
|
*/
|
|
void
|
|
interrupt()
|
|
{
|
|
ptyflush(); /* half-hearted */
|
|
|
|
#if defined(STREAMSPTY) && defined(TIOCSIGNAL)
|
|
/* Streams PTY style ioctl to post a signal */
|
|
if (really_stream)
|
|
{
|
|
int sig = SIGINT;
|
|
ioctl(ourpty, TIOCSIGNAL, &sig);
|
|
ioctl(ourpty, I_FLUSH, FLUSHR);
|
|
}
|
|
#else
|
|
#ifdef TCSIG
|
|
ioctl(ourpty, TCSIG, (char *)SIGINT);
|
|
#else /* TCSIG */
|
|
init_termbuf();
|
|
*pfrontp++ = slctab[SLC_IP].sptr ?
|
|
(unsigned char)*slctab[SLC_IP].sptr : '\177';
|
|
#endif /* TCSIG */
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Send quit to process on other side of pty.
|
|
* If it is in raw mode, just write NULL;
|
|
* otherwise, write quit char.
|
|
*/
|
|
void
|
|
sendbrk()
|
|
{
|
|
ptyflush(); /* half-hearted */
|
|
#ifdef TCSIG
|
|
ioctl(ourpty, TCSIG, (char *)SIGQUIT);
|
|
#else /* TCSIG */
|
|
init_termbuf();
|
|
*pfrontp++ = slctab[SLC_ABORT].sptr ?
|
|
(unsigned char)*slctab[SLC_ABORT].sptr : '\034';
|
|
#endif /* TCSIG */
|
|
}
|
|
|
|
void
|
|
sendsusp()
|
|
{
|
|
#ifdef SIGTSTP
|
|
ptyflush(); /* half-hearted */
|
|
# ifdef TCSIG
|
|
ioctl(ourpty, TCSIG, (char *)SIGTSTP);
|
|
# else /* TCSIG */
|
|
*pfrontp++ = slctab[SLC_SUSP].sptr ?
|
|
(unsigned char)*slctab[SLC_SUSP].sptr : '\032';
|
|
# endif /* TCSIG */
|
|
#endif /* SIGTSTP */
|
|
}
|
|
|
|
/*
|
|
* When we get an AYT, if ^T is enabled, use that. Otherwise,
|
|
* just send back "[Yes]".
|
|
*/
|
|
void
|
|
recv_ayt()
|
|
{
|
|
#if defined(SIGINFO) && defined(TCSIG)
|
|
if (slctab[SLC_AYT].sptr && *slctab[SLC_AYT].sptr != _POSIX_VDISABLE) {
|
|
ioctl(ourpty, TCSIG, (char *)SIGINFO);
|
|
return;
|
|
}
|
|
#endif
|
|
output_data("\r\n[Yes]\r\n");
|
|
}
|
|
|
|
void
|
|
doeof()
|
|
{
|
|
init_termbuf();
|
|
|
|
*pfrontp++ = slctab[SLC_EOF].sptr ?
|
|
(unsigned char)*slctab[SLC_EOF].sptr : '\004';
|
|
}
|