add scripts and tuntap.c
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Blatt02/assets/image-20241110210209022.png
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Blatt02/assets/image-20241110210209022.png
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Blatt02/scripts/103.sh
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Blatt02/scripts/103.sh
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#!/bin/bash
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bash /home/rnp/2/101.sh
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echo "Now running 103.sh"
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assign_vlan(){
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local dev=$1
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local eth=$2
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local id=$3
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local ip=$4
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ssh $dev "ip link add link $eth name $eth.$id type vlan id $id"
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ssh $dev "ip link set dev $eth.$id up"
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ssh $dev "ip addr flush dev $eth"
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ssh $dev "ip addr add $ip dev $eth.$id"
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}
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assign_vlan "router4" "eth1" "100" "10.5.1.4/24"
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assign_vlan "pc3" "eth1" "100" "10.5.1.3/24"
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assign_vlan "pc2" "eth1" "200" "10.5.1.2/24"
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assign_vlan "pc1" "eth1" "200" "10.5.1.1/24"
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ping_dev(){
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local dev=$1
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local ip=$2
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local eth_n=$3
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# ssh "$dev" $cmd
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loss=$(ssh $dev "ping -c 5 -W 2 -I eth$eth_n $ip | awk -F', ' '/packet loss/ {print \$3}' | awk '{print int(\$1)}'")
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echo $loss
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}
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check(){
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local dev1=$1
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local dev2=$2
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local ping_loss=$3
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local num=$4
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echo $ping_loss
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if [ $ping_loss -eq $num ]; then
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echo -e "from $dev1 to $dev2: \t yes"
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else
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echo -e "from $dev1 to $dev2: \t no"
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fi
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}
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loss=$(ping_dev "router4" "10.5.1.1" "1.100")
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check "router4" "pc1" "$loss" 100
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loss=$(ping_dev "router4" "10.5.1.2" "1.100")
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check "router4" "pc2" "$loss" 100
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loss=$(ping_dev "router4" "10.5.1.3" "1.100")
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check "router4" "pc3" "$loss" 0
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loss=$(ping_dev "pc1" "10.5.1.2" "1.200")
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check "pc1" "pc2" "$loss" 0
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loss=$(ping_dev "pc1" "10.5.1.3" "1.200")
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check "pc1" "pc3" "$loss" 100
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loss=$(ping_dev "pc1" "10.5.1.4" "1.200")
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check "pc1" "router4" "$loss" 100
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loss=$(ping_dev "pc2" "10.5.1.1" "1.200")
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check "pc2" "pc1" "$loss" 0
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loss=$(ping_dev "pc2" "10.5.1.3" "1.200")
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check "pc2" "pc3" "$loss" 100
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loss=$(ping_dev "pc2" "10.5.1.4" "1.200")
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check "pc2" "router4" "$loss" 100
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loss=$(ping_dev "pc3" "10.5.1.1" "1.100")
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check "pc3" "pc1" "$loss" 100
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loss=$(ping_dev "pc3" "10.5.1.2" "1.100")
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check "pc3" "pc2" "$loss" 100
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loss=$(ping_dev "pc3" "10.5.1.4" "1.100")
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check "pc3" "router4" "$loss" 0
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87
Blatt02/tuntap.c
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Blatt02/tuntap.c
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#include <assert.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <linux/if_tun.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdint.h>
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#define CLEAR(x) memset(&(x), 0x00, sizeof(x))
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#define IFNAME "tap0"
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#define BUFLEN 1600
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static int tun_alloc(char *dev)
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{
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struct ifreq ifr;
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int fd, err;
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if( (fd = open("/dev/net/tun", O_RDWR)) < 0 ) {
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perror("Cannot open TUN/TAP dev\n"
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"Make sure one exists with "
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"'$ mknod /dev/net/tun c 10 200'");
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exit(1);
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}
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CLEAR(ifr);
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/* Flags: IFF_TUN - TUN device (no Ethernet headers)
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* IFF_TAP - TAP device
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*
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* IFF_NO_PI - Do not provide packet information
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*/
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ifr.ifr_flags = 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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}
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if( (err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 ){
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perror("ERR: Could not ioctl tun");
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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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int main(int argc, char** argv) {
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char dev[IFNAMSIZ];
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int tun_fd;
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if (argc > 1) {
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assert(strlen(argv[1]) < IFNAMSIZ);
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strcpy(dev, argv[1]);
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} else {
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strcpy(dev, IFNAME);
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}
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printf("device name: %s\n", dev);
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tun_fd = tun_alloc(dev);
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int running = 1;
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uint8_t buf[BUFLEN];
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while (running) {
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int nread;
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if ((nread = read(tun_fd, buf, BUFLEN)) < 0) {
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perror("ERR: Read from tun_fd");
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break;
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}
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printf("Read %d bytes from device %s\n", nread, dev);
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}
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close(tun_fd);
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return EXIT_SUCCESS;
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}
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