dimitri/Satrap
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

redirect_traffic function

Browse source
This commit is contained in:
Dimitri Lozeve 2016-06-03 11:03:25 +02:00
parent 9c19bba5ec
commit a7ac904e54
2 changed files with 55 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

38
arp.c
View file

@ -227,3 +227,41 @@ int listen_arp_frame(int sockfd, struct ether_arp *result)
}
/* Redirects all ethernet traffic from one address to another.
args: struct args, which contains the hardware and protocol
addresses of the targets.
Never returns (killed when the main thread terminates).
*/
void *redirect_traffic(void *args)
{
struct args *addresses = (struct args *) args;
int sockfd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
if (sockfd < 0) {
perror("[FAIL] socket()");
exit(EXIT_FAILURE);
}
char buffer[1024];
struct ether_header *eh = (struct ether_header *) buffer;
while (1) {
int len = recv(sockfd, buffer, sizeof(buffer), 0);
if (len <= 0) {
continue;
}
if (eh->ether_dhost == addresses->macaddr1) {
sendto(sockfd, buffer, sizeof(buffer), 0, (struct sockaddr *)&addresses->ip_addr1, sizeof(struct sockaddr));
}
else if (eh->ether_dhost == addresses->macaddr2) {
sendto(sockfd, buffer, sizeof(buffer), 0, (struct sockaddr *)&addresses->ip_addr2, sizeof(struct sockaddr));
}
}
return NULL;
}

17
arp.h
View file

@ -60,4 +60,21 @@ int send_arp_reply(int sockfd, int ifindex, struct sockaddr_in *sender_ip, unsig
int listen_arp_frame(int sockfd, struct ether_arp *result);
struct args {
unsigned char macaddr1[6];
unsigned char macaddr2[6];
struct sockaddr_in ip_addr1;
struct sockaddr_in ip_addr2;
};
/* Redirects all ethernet traffic from one address to another.
args: struct args, which contains the hardware and protocol
addresses of the targets.
Never returns (killed when the main thread terminates).
*/
void *redirect_traffic(void *args);
#endif /* ARP_H_ */