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133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
/*
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VTun - Virtual Tunnel over TCP/IP network.
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Copyright (C) 1998-2000 Maxim Krasnyansky <max_mk@yahoo.com>
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VTun has been derived from VPPP package by Maxim Krasnyansky.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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/*
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* $Id: tun_dev.c,v 1.4 2006/12/11 10:45:35 mtbishop Exp $
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*/
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/* #include "config.h" */
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <linux/if.h>
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/* #include "vtun.h"
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#include "lib.h" */
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/*
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* Allocate TUN device, returns opened fd.
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* Stores dev name in the first arg(must be large enough).
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*/
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static int tun_open_common0(char *dev, int istun)
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{
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char tunname[14];
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int i, fd, err;
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if( *dev ) {
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sprintf(tunname, "/dev/%s", dev);
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return open(tunname, O_RDWR);
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}
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sprintf(tunname, "/dev/%s", istun ? "tun" : "tap");
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err = 0;
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for(i=0; i < 255; i++){
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sprintf(tunname + 8, "%d", i);
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/* Open device */
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if( (fd=open(tunname, O_RDWR)) > 0 ) {
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strcpy(dev, tunname + 5);
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return fd;
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}
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else if (errno != ENOENT)
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err = errno;
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else if (i) /* don't try all 256 devices */
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break;
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}
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if (err)
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errno = err;
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return -1;
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}
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#ifdef HAVE_LINUX_IF_TUN_H /* New driver support */
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#include <linux/if_tun.h>
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#ifndef OTUNSETNOCSUM
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/* pre 2.4.6 compatibility */
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#define OTUNSETNOCSUM (('T'<< 8) | 200)
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#define OTUNSETDEBUG (('T'<< 8) | 201)
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#define OTUNSETIFF (('T'<< 8) | 202)
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#define OTUNSETPERSIST (('T'<< 8) | 203)
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#define OTUNSETOWNER (('T'<< 8) | 204)
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#endif
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static int tun_open_common(char *dev, int istun)
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{
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struct ifreq ifr;
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int fd;
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if ((fd = open("/dev/net/tun", O_RDWR)) < 0)
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return tun_open_common0(dev, istun);
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = (istun ? IFF_TUN : IFF_TAP) | IFF_NO_PI;
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if (*dev)
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strncpy(ifr.ifr_name, dev, IFNAMSIZ);
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if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0) {
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if (errno == EBADFD) {
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/* Try old ioctl */
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if (ioctl(fd, OTUNSETIFF, (void *) &ifr) < 0)
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goto failed;
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} else
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goto failed;
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}
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strcpy(dev, ifr.ifr_name);
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return fd;
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failed:
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close(fd);
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return -1;
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}
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#else
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# define tun_open_common(dev, type) tun_open_common0(dev, type)
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#endif /* New driver support */
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int tun_open(char *dev) { return tun_open_common(dev, 1); }
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int tap_open(char *dev) { return tun_open_common(dev, 0); }
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int tun_close(int fd, char *dev) { return close(fd); }
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int tap_close(int fd, char *dev) { return close(fd); }
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/* Read/write frames from TUN device */
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int tun_write(int fd, char *buf, int len) { return write(fd, buf, len); }
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int tap_write(int fd, char *buf, int len) { return write(fd, buf, len); }
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int tun_read(int fd, char *buf, int len) { return read(fd, buf, len); }
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int tap_read(int fd, char *buf, int len) { return read(fd, buf, len); }
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