diff options
Diffstat (limited to 'crypto/kerberosIV/appl/kip/common.c')
| -rw-r--r-- | crypto/kerberosIV/appl/kip/common.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/crypto/kerberosIV/appl/kip/common.c b/crypto/kerberosIV/appl/kip/common.c new file mode 100644 index 0000000..b21d03d --- /dev/null +++ b/crypto/kerberosIV/appl/kip/common.c @@ -0,0 +1,178 @@ +/* + * 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: common.c,v 1.12 1997/05/02 14:28:06 assar Exp $"); + +/* + * Copy packets from `tundev' to `netdev' or vice versa. + * Mode is used when reading from `tundev' + */ + +int +copy_packets (int tundev, int netdev, int mtu, des_cblock *iv, + des_key_schedule schedule) +{ + des_cblock iv1, iv2; + int num1 = 0, num2 = 0; + u_char *buf; + + buf = malloc (mtu + 2); + if (buf == NULL) { + warnx("malloc(%d) failed", mtu); + return 1; + } + + memcpy (&iv1, iv, sizeof(iv1)); + memcpy (&iv2, iv, sizeof(iv2)); + for (;;) { + fd_set fdset; + int ret, len; + + FD_ZERO(&fdset); + FD_SET(tundev, &fdset); + FD_SET(netdev, &fdset); + + ret = select (max(tundev, netdev)+1, &fdset, NULL, NULL, NULL); + if (ret < 0 && errno != EINTR) { + warn ("select"); + return 1; + } + if (FD_ISSET(tundev, &fdset)) { + ret = read (tundev, buf + 2, mtu); + if (ret == 0) + return 0; + if (ret < 0) { + if (errno == EINTR) + continue; + else { + warn("read"); + return ret; + } + } + buf[0] = ret >> 8; + buf[1] = ret & 0xFF; + ret += 2; + des_cfb64_encrypt (buf, buf, ret, schedule, + &iv1, &num1, DES_ENCRYPT); + ret = krb_net_write (netdev, buf, ret); + if (ret < 0) { + warn("write"); + return ret; + } + } + if (FD_ISSET(netdev, &fdset)) { + ret = read (netdev, buf, 2); + if (ret == 0) + return 0; + if (ret < 0) { + if (errno == EINTR) + continue; + else { + warn("read"); + return ret; + } + } + des_cfb64_encrypt (buf, buf, 2, schedule, + &iv2, &num2, DES_DECRYPT); + len = (buf[0] << 8 ) | buf[1]; + ret = krb_net_read (netdev, buf + 2, len); + if (ret == 0) + return 0; + if (ret < 0) { + if (errno == EINTR) + continue; + else { + warn("read"); + return ret; + } + } + des_cfb64_encrypt (buf + 2, buf + 2, len, schedule, + &iv2, &num2, DES_DECRYPT); + ret = krb_net_write (tundev, buf + 2, len); + if (ret < 0) { + warn("write"); + return ret; + } + } + } +} + +/* + * Signal handler that justs waits for the children when they die. + */ + +RETSIGTYPE +childhandler (int sig) +{ + pid_t pid; + int status; + + do { + pid = waitpid (-1, &status, WNOHANG|WUNTRACED); + } while(pid > 0); + signal (SIGCHLD, childhandler); + SIGRETURN(0); +} + +/* + * Find a free tunnel device and open it. + */ + +int +tunnel_open (void) +{ + int fd; + int i; + char name[64]; + + for (i = 0; i < 256; ++i) { + snprintf (name, sizeof(name), "%s%s%d", _PATH_DEV, TUNDEV, i); + fd = open (name, O_RDWR, 0); + if (fd >= 0) + break; + if (errno == ENOENT || errno == ENODEV) { + warn("open %s", name); + return fd; + } + } + if (fd < 0) + warn("open %s" ,name); + return fd; +} |
