319 lines
8.3 KiB
C
319 lines
8.3 KiB
C
/*
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* Copyright (c) 2011, 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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* 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. 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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/**
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* \author
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* Niclas Finne <nfi@sics.se>
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* Joakim Eriksson <joakime@sics.se>
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*/
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#include "net/ipv6/uip.h"
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#include "net/ipv6/uip-ds6.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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/*---------------------------------------------------------------------------*/
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/* Log configuration */
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#include "sys/log.h"
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#define LOG_MODULE "BR"
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#define LOG_LEVEL LOG_LEVEL_NONE
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#ifdef linux
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#include <linux/if.h>
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#include <linux/if_tun.h>
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#endif
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#include <err.h>
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#include "net/netstack.h"
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#include "net/packetbuf.h"
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#include "cmd.h"
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#include "border-router.h"
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extern const char *slip_config_ipaddr;
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extern char slip_config_tundev[32];
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extern uint16_t slip_config_basedelay;
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#ifndef __CYGWIN__
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static int tunfd;
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static int set_fd(fd_set *rset, fd_set *wset);
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static void handle_fd(fd_set *rset, fd_set *wset);
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static const struct select_callback tun_select_callback = {
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set_fd,
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handle_fd
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};
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#endif /* __CYGWIN__ */
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int ssystem(const char *fmt, ...)
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__attribute__((__format__ (__printf__, 1, 2)));
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int
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ssystem(const char *fmt, ...) __attribute__((__format__ (__printf__, 1, 2)));
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int
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ssystem(const char *fmt, ...)
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{
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char cmd[128];
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va_list ap;
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va_start(ap, fmt);
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vsnprintf(cmd, sizeof(cmd), fmt, ap);
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va_end(ap);
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printf("%s\n", cmd);
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fflush(stdout);
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return system(cmd);
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}
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/*---------------------------------------------------------------------------*/
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void
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cleanup(void)
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{
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ssystem("ifconfig %s down", slip_config_tundev);
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#ifndef linux
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ssystem("sysctl -w net.ipv6.conf.all.forwarding=1");
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#endif
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ssystem("netstat -nr"
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" | awk '{ if ($2 == \"%s\") print \"route delete -net \"$1; }'"
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" | sh",
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slip_config_tundev);
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}
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/*---------------------------------------------------------------------------*/
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void
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sigcleanup(int signo)
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{
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fprintf(stderr, "signal %d\n", signo);
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exit(0); /* exit(0) will call cleanup() */
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}
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/*---------------------------------------------------------------------------*/
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void
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ifconf(const char *tundev, const char *ipaddr)
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{
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#ifdef linux
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ssystem("ifconfig %s inet `hostname` up", tundev);
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ssystem("ifconfig %s add %s", tundev, ipaddr);
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#elif defined(__APPLE__)
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ssystem("ifconfig %s inet6 %s up", tundev, ipaddr);
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ssystem("sysctl -w net.inet.ip.forwarding=1");
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#else
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ssystem("ifconfig %s inet `hostname` %s up", tundev, ipaddr);
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ssystem("sysctl -w net.inet.ip.forwarding=1");
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#endif /* !linux */
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/* Print the configuration to the console. */
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ssystem("ifconfig %s\n", tundev);
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}
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/*---------------------------------------------------------------------------*/
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int
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devopen(const char *dev, int flags)
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{
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char t[32];
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strcpy(t, "/dev/");
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strncat(t, dev, sizeof(t) - 5);
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return open(t, flags);
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}
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/*---------------------------------------------------------------------------*/
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#ifdef linux
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int
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tun_alloc(char *dev)
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{
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struct ifreq ifr;
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int fd, err;
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if((fd = open("/dev/net/tun", O_RDWR)) < 0) {
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return -1;
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}
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memset(&ifr, 0, sizeof(ifr));
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/* Flags: IFF_TUN - TUN device (no Ethernet headers)
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* IFF_NO_PI - Do not provide packet information
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*/
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ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
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if(*dev != 0) {
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strncpy(ifr.ifr_name, dev, IFNAMSIZ);
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}
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if((err = ioctl(fd, TUNSETIFF, (void *)&ifr)) < 0) {
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close(fd);
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return err;
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}
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strcpy(dev, ifr.ifr_name);
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return fd;
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}
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#else
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int
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tun_alloc(char *dev)
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{
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return devopen(dev, O_RDWR);
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}
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#endif
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#ifdef __CYGWIN__
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/*wpcap process is used to connect to host interface */
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void
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tun_init()
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{
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setvbuf(stdout, NULL, _IOLBF, 0); /* Line buffered output. */
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slip_init();
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}
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#else
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static uint16_t delaymsec = 0;
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static uint32_t delaystartsec, delaystartmsec;
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/*---------------------------------------------------------------------------*/
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void
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tun_init()
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{
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setvbuf(stdout, NULL, _IOLBF, 0); /* Line buffered output. */
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slip_init();
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LOG_INFO("Opening tun interface:%s\n", slip_config_tundev);
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tunfd = tun_alloc(slip_config_tundev);
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if(tunfd == -1) {
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err(1, "tun_init: open");
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}
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select_set_callback(tunfd, &tun_select_callback);
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fprintf(stderr, "opened %s device ``/dev/%s''\n",
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"tun", slip_config_tundev);
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atexit(cleanup);
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signal(SIGHUP, sigcleanup);
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signal(SIGTERM, sigcleanup);
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signal(SIGINT, sigcleanup);
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ifconf(slip_config_tundev, slip_config_ipaddr);
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}
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/*---------------------------------------------------------------------------*/
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static int
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tun_output(uint8_t *data, int len)
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{
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/* fprintf(stderr, "*** Writing to tun...%d\n", len); */
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if(write(tunfd, data, len) != len) {
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err(1, "serial_to_tun: write");
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return -1;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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int
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tun_input(unsigned char *data, int maxlen)
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{
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int size;
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if((size = read(tunfd, data, maxlen)) == -1) {
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err(1, "tun_input: read");
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}
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return size;
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}
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/*---------------------------------------------------------------------------*/
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static void
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init(void)
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{
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}
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/*---------------------------------------------------------------------------*/
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static int
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output(void)
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{
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LOG_DBG("SUT: %u\n", uip_len);
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if(uip_len > 0) {
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return tun_output(uip_buf, uip_len);
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}
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return 0;
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}
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const struct uip_fallback_interface rpl_interface = {
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init, output
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};
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/*---------------------------------------------------------------------------*/
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/* tun and slip select callback */
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/*---------------------------------------------------------------------------*/
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static int
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set_fd(fd_set *rset, fd_set *wset)
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{
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FD_SET(tunfd, rset);
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static void
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handle_fd(fd_set *rset, fd_set *wset)
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{
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/* Optional delay between outgoing packets */
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/* Base delay times number of 6lowpan fragments to be sent */
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/* delaymsec = 10; */
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if(delaymsec) {
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struct timeval tv;
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int dmsec;
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gettimeofday(&tv, NULL);
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dmsec = (tv.tv_sec - delaystartsec) * 1000 + tv.tv_usec / 1000 - delaystartmsec;
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if(dmsec < 0) {
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delaymsec = 0;
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}
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if(dmsec > delaymsec) {
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delaymsec = 0;
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}
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}
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if(delaymsec == 0) {
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int size;
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if(FD_ISSET(tunfd, rset)) {
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size = tun_input(uip_buf, sizeof(uip_buf));
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/* printf("TUN data incoming read:%d\n", size); */
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uip_len = size;
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tcpip_input();
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if(slip_config_basedelay) {
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struct timeval tv;
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gettimeofday(&tv, NULL);
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delaymsec = slip_config_basedelay;
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delaystartsec = tv.tv_sec;
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delaystartmsec = tv.tv_usec / 1000;
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}
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}
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}
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}
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#endif /* __CYGWIN_ */
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/*---------------------------------------------------------------------------*/
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