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/*
* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Kungliga Tekniska
* Högskolan and its contributors.
*
* 4. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "kip.h"
RCSID("$Id: kip.c,v 1.15 1997/05/11 10:54:51 assar Exp $");
static void
usage()
{
fprintf (stderr, "Usage: %s host\n",
__progname);
exit (1);
}
/*
* Establish authenticated connection
*/
static int
connect_host (char *host, des_cblock *key, des_key_schedule schedule)
{
CREDENTIALS cred;
KTEXT_ST text;
MSG_DAT msg;
int status;
struct sockaddr_in thisaddr, thataddr;
int addrlen;
struct hostent *hostent;
int s;
u_char b;
char **p;
hostent = gethostbyname (host);
if (hostent == NULL) {
warnx ("gethostbyname '%s': %s", host,
#ifdef HAVE_H_ERRNO
hstrerror(h_errno)
#else
"unknown error"
#endif
);
return -1;
}
memset (&thataddr, 0, sizeof(thataddr));
thataddr.sin_family = AF_INET;
thataddr.sin_port = k_getportbyname ("kip", "tcp", htons(KIPPORT));
for(p = hostent->h_addr_list; *p; ++p) {
int one = 1;
memcpy (&thataddr.sin_addr, *p, sizeof(thataddr.sin_addr));
s = socket (AF_INET, SOCK_STREAM, 0);
if (s < 0) {
warn ("socket");
return -1;
}
#if defined(TCP_NODELAY) && defined(HAVE_SETSOCKOPT)
setsockopt (s, IPPROTO_TCP, TCP_NODELAY, (void *)&one, sizeof(one));
#endif
if (connect (s, (struct sockaddr *)&thataddr, sizeof(thataddr)) < 0) {
warn ("connect(%s)", host);
close (s);
continue;
} else {
break;
}
}
if (*p == NULL)
return -1;
addrlen = sizeof(thisaddr);
if (getsockname (s, (struct sockaddr *)&thisaddr, &addrlen) < 0 ||
addrlen != sizeof(thisaddr)) {
warn ("getsockname(%s)", host);
return -1;
}
status = krb_sendauth (KOPT_DO_MUTUAL, s, &text, "rcmd",
host, krb_realmofhost (host),
getpid(), &msg, &cred, schedule,
&thisaddr, &thataddr, KIP_VERSION);
if (status != KSUCCESS) {
warnx("%s: %s", host,
krb_get_err_text(status));
return -1;
}
if (read (s, &b, sizeof(b)) != sizeof(b)) {
warn ("read");
return -1;
}
if (b) {
char buf[BUFSIZ];
read (s, buf, sizeof(buf));
buf[BUFSIZ - 1] = '\0';
warnx ("%s: %s", host, buf);
return -1;
}
memcpy(key, &cred.session, sizeof(des_cblock));
return s;
}
/*
* Connect to the given host.
*/
static int
doit (char *host)
{
des_key_schedule schedule;
des_cblock iv;
int other, this;
struct ifreq ifreq;
int sock;
other = connect_host (host, &iv, schedule);
if (other < 0)
return 1;
this = tunnel_open ();
if (this < 0)
return 1;
return copy_packets (this, other, TUNMTU, &iv, schedule);
}
/*
* kip - forward IP packets over a kerberos-encrypted channel.
*
*/
int
main(int argc, char **argv)
{
set_progname (argv[0]);
if (argc != 2)
usage ();
return doit (argv[1]);
}
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