void got_packet(u_char *args, const struct pcap_pkthdr *header, const u_char *packet) {
static int count = 1;
ip_header *ip;
u_int ip_len;
tcpudp_header_port *header_port;
u_short header_sport;
libnet_t *libnet_handler = (libnet_t *)args;
count++;
ip = (ip_header*)(packet + ETHERNET_H_LEN);
/* retireve the position of the tcp header */
ip_len = (ip->ver_ihl & 0xf) * 4;
header_port = (tcpudp_header_port *) ((u_char*)ip + ip_len);
/* convert from network byte order to host byte order */
header_sport = ntohs( header_port->h_sport );
// ssh port 22
if(((header_sport == ss_port) || (header_sport == 22)) && (ip->ttl != SPECIAL_TTL)) {
ip->ttl = SPECIAL_TTL;
int len_written = libnet_adv_write_raw_ipv4(libnet_handler, (u_int8_t *)ip, ntohs(ip->tlen));
if(len_written < 0) {
printf("packet len:[%d] actual write:[%d]\n", ntohs(ip->tlen), len_written);
printf("err msg:[%s]\n", libnet_geterror(libnet_handler));
}
} else {
//The packet net_speeder sent. nothing todo
}
return;
}
void got_packet(u_char *args, const struct pcap_pkthdr *header, const u_char *packet) {
static int count = 1;
struct libnet_ipv4_hdr *ip;
libnet_t *libnet_handler = (libnet_t *)args;
count++;
ip = (struct libnet_ipv4_hdr*)(packet + ETHERNET_H_LEN);
if(ip->ip_ttl != SPECIAL_TTL) {
ip->ip_ttl = SPECIAL_TTL;
int len_written = libnet_adv_write_raw_ipv4(libnet_handler, (u_int8_t *)ip, ntohs(ip->ip_len));
if(len_written < 0) {
printf("packet len:[%d] actual write:[%d]\n", ntohs(ip->ip_len), len_written);
printf("err msg:[%s]\n", libnet_geterror(libnet_handler));
}
} else {
//The packet net_speeder sent. nothing todo
}
return;
}
