158 lines
4.1 KiB
C
158 lines
4.1 KiB
C
/*
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* Copyright (c) 2001, Swedish Institute of Computer Science.
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* 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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*
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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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*
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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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*
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* 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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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* Author: Adam Dunkels <adam@sics.se>
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*
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* $Id: tapdev.c,v 1.8 2006/06/07 08:39:58 adam Exp $
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*/
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#define UIP_DRIPADDR0 192
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#define UIP_DRIPADDR1 168
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#define UIP_DRIPADDR2 0
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#define UIP_DRIPADDR3 1
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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 <unistd.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/uio.h>
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#include <sys/socket.h>
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#ifdef linux
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#include <sys/ioctl.h>
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#include <linux/if.h>
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#include <linux/if_tun.h>
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#define DEVTAP "/dev/net/tun"
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#else /* linux */
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#define DEVTAP "/dev/tap0"
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#endif /* linux */
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#include "uip.h"
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static int drop = 0;
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static int fd;
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/*---------------------------------------------------------------------------*/
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void
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tapdev_init(void)
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{
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char buf[1024];
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fd = open(DEVTAP, O_RDWR);
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if (fd == -1)
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{
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perror("tapdev: tapdev_init: open");
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exit(1);
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}
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#ifdef linux
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{
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
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if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0)
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{
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perror(buf);
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exit(1);
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}
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}
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#endif /* Linux */
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snprintf(buf, sizeof(buf), "ifconfig tap0 inet %d.%d.%d.%d",
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UIP_DRIPADDR0, UIP_DRIPADDR1, UIP_DRIPADDR2, UIP_DRIPADDR3);
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system(buf);
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}
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/*---------------------------------------------------------------------------*/
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unsigned int
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tapdev_read(void)
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{
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fd_set fdset;
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struct timeval tv, now;
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int ret;
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tv.tv_sec = 0;
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tv.tv_usec = 1000;
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FD_ZERO(&fdset);
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FD_SET(fd, &fdset);
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ret = select(fd + 1, &fdset, NULL, NULL, &tv);
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if (ret == 0)
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{
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return 0;
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}
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ret = read(fd, uip_buf, UIP_BUFSIZE);
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if (ret == -1)
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{
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perror("tap_dev: tapdev_read: read");
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}
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/* printf("--- tap_dev: tapdev_read: read %d bytes\n", ret);*/
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/* {
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int i;
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for(i = 0; i < 20; i++) {
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printf("%x ", uip_buf[i]);
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}
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printf("\n");
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}*/
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/* check_checksum(uip_buf, ret);*/
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return ret;
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}
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/*---------------------------------------------------------------------------*/
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void
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tapdev_send(void)
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{
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int ret;
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/* printf("tapdev_send: sending %d bytes\n", size);*/
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/* check_checksum(uip_buf, size);*/
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/* drop++;
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if(drop % 8 == 7) {
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printf("Dropped a packet!\n");
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return;
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}*/
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ret = write(fd, uip_buf, uip_len);
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if (ret == -1)
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{
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perror("tap_dev: tapdev_send: writev");
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exit(1);
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}
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}
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/*---------------------------------------------------------------------------*/
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