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server.c
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server.c
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/*
============================================================================
Name : server.c
Author : Javier Lopez
Version :
Copyright :
Description :
============================================================================
*/
#include <pthread.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <asm/types.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <linux/if.h>
#include <linux/if_packet.h>
#include <linux/if_ether.h>
#include <linux/if_arp.h>
#include <arpa/inet.h>
#include <stdio.h>
#include "rawsend.h"
int sock_fd = 0;
char *ifname;
int running = 1;
struct raw_result server_result;
void print_result(struct raw_result *result)
{
double diff, rate;
diff = result->useconds;
diff /= 1000000;
diff += result->seconds;
rate = 8*(double)result->bytes/diff/1024;
printf(" time: %3u.%02u\n", result->seconds, result->useconds/10000);
printf(" packets: %6u\n", result->packets);
printf(" bytes: %6u\n", result->bytes);
printf(" rate: %6.2f\n", rate);
printf(" loss: %6.2f\n", 1 - (double)result->packets/(double)(server_result.sequence));
printf(" dups: %6u\n", result->duplicates);
}
int open_socket(const char *ifname)
{
struct ifreq ifr;
int sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
if (sock < 0)
exit(EXIT_FAILURE);
return sock;
/* set promiscuous mode */
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
ioctl(sock, SIOCGIFFLAGS, &ifr);
ifr.ifr_flags |= IFF_PROMISC;
ioctl(sock, SIOCGIFFLAGS, &ifr);
return sock;
}
void close_socket(int sock)
{
struct ifreq ifr;
/* reset promiscuous mode */
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
ioctl(sock_fd, SIOCGIFFLAGS, &ifr);
ifr.ifr_flags &= ~IFF_PROMISC;
ioctl(sock_fd, SIOCSIFFLAGS, &ifr);
shutdown(sock_fd, SHUT_RD);
close(sock_fd);
}
void print_mac(const char *addr)
{
int i;
for (i = 0; i < ETH_ALEN - 1; i++)
printf("%02hhx:", addr[i]);
printf("%02hhx\n", addr[ETH_ALEN - 1]);
}
int interface_index(int sock, char *ifname)
{
struct ifreq ifr;
int i;
/* retrieve source ethernet interface index */
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
if (ioctl(sock_fd, SIOCGIFINDEX, &ifr) < 0)
return -EXIT_FAILURE;
return ifr.ifr_ifindex;
}
int interface_addr(int sock, char *ifname, char *addr)
{
struct ifreq ifr;
/* retrieve corresponding source MAC */
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
if (ioctl(sock_fd, SIOCGIFHWADDR, &ifr) < 0)
return -EXIT_FAILURE;
memcpy(addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
return EXIT_SUCCESS;
}
void sigint(int signum)
{
if (!running)
exit(EXIT_FAILURE);
running = 0;
}
double timeval_subtract(struct timeval *result, struct timeval *t2, struct timeval *t1)
{
double ret;
long int diff;
diff = (t2->tv_usec + 1000000 * t2->tv_sec) - (t1->tv_usec + 1000000 * t1->tv_sec);
result->tv_sec = diff / 1000000;
result->tv_usec = diff % 1000000;
ret = diff;
ret /= 1000000.0;
return ret;
}
int main(int argc, char *argv[]) {
unsigned char *buff = (void *)malloc(PACKET_SIZE);
unsigned char *data_ptr = buff + ETH_HLEN;
unsigned char dst_mac[ETH_ALEN];
struct ethhdr *eth_hdr = (struct ethhdr *)buff;
struct sockaddr_ll s_addr;
struct timeval begin, end, elapsed;
struct raw_result *result = (struct raw_result *)(data_ptr + sizeof(END_OF_STREAM));
double diff;
int if_index = 0, recv, i, seq;
if (argc < 2)
{
printf("Missing arguments.\n"
"%s [ifname] \n",argv[0]);
exit(EXIT_FAILURE);
}
ifname = argv[1];
/* open socket */
if ((sock_fd = open_socket(ifname)) < 0)
exit(EXIT_FAILURE);
/* get ethernet interface index */
if ((if_index = interface_index(sock_fd, ifname)) < 0)
exit(EXIT_FAILURE);
/* get ethernet interface address */
if (interface_addr(sock_fd, ifname, dst_mac) < 0)
exit(EXIT_FAILURE);
/* prepare sockaddr_ll */
memset(&s_addr, 0, sizeof(s_addr));
s_addr.sll_family = AF_PACKET;
s_addr.sll_protocol = htons(ETH_P_ALL);
s_addr.sll_ifindex = if_index;
/* bind to interface */
if (bind(sock_fd, (struct sockaddr *) &s_addr, sizeof(s_addr)) == -1)
exit(EXIT_FAILURE);
/* enable signal */
signal(SIGINT, sigint);
printf("listening on ");
print_mac(dst_mac);
while (running) {
recv = recvfrom(sock_fd, buff, PACKET_SIZE, 0, NULL, NULL);
if (recv <= 0)
break;
/* check if packet is for us */
if (memcmp(eth_hdr->h_dest, dst_mac, ETH_ALEN) != 0)
continue;
/* break on special packet */
if (memcmp(data_ptr, END_OF_STREAM, sizeof(END_OF_STREAM))== 0)
break;
/* record timestamp on first received packet */
if (server_result.packets == 0) {
if (gettimeofday(&begin, 0) < 0)
exit(EXIT_FAILURE);
printf("connect from ");
print_mac(eth_hdr->h_source);
}
seq = ntohl(*(unsigned int *)data_ptr);
if (seq > server_result.sequence) {
server_result.sequence = seq;
} else {
server_result.duplicates++;
continue;
}
/* update counters */
server_result.packets++;
server_result.bytes += recv;
}
/* record timestamp */
if (gettimeofday(&end, 0) < 0)
exit(EXIT_FAILURE);
/* prepare report */
diff = timeval_subtract(&elapsed, &end, &begin);
result->seconds = htonl(elapsed.tv_sec);
result->useconds = htonl(elapsed.tv_usec);
result->packets = htonl(server_result.packets);
result->bytes = htonl(server_result.bytes);
result->duplicates = htonl(server_result.duplicates);
/* prepare header */
memcpy(eth_hdr->h_dest, eth_hdr->h_source, ETH_ALEN);
memcpy(eth_hdr->h_source, dst_mac, ETH_ALEN);
/* prepare sockaddr */
memcpy(s_addr.sll_addr, eth_hdr->h_dest, ETH_ALEN);
/* send server report */
for (i = 0; i < 10; i++)
sendto(sock_fd, buff, ETH_HLEN + sizeof(END_OF_STREAM) + sizeof(*result), 0,
(struct sockaddr *)&s_addr, sizeof(s_addr));
close_socket(sock_fd);
free(buff);
/* prepare and print result */
server_result.seconds = elapsed.tv_sec;
server_result.useconds = elapsed.tv_usec;
printf("server report:\n");
print_result(&server_result);
return EXIT_SUCCESS;
}