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Can now handle IPv6 packets, documentation update

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This commit is contained in:
Matthias Cramer
2025-03-21 01:06:06 +01:00
parent 05abe850c0
commit 575db5fd62
2 changed files with 50 additions and 13 deletions
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51
main.c
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@@ -9,9 +9,16 @@
#include <netdb.h>
#include <unistd.h>
#define ENABLE_IPV6
#ifdef ENABLE_IPV6
#include <netinet/ip6.h> // Include for IPv6 header definition
#endif
#define DEFAULT_DEST_PORT 37008 // Default TZSP port
#define TZSP_ENCAP_LEN 4 // Length of TZSP encapsulation header
#define TZSP_TAGGED_LEN 1 // Length of TZSP tagged field header (type)
#define ETHERNET_HEADER_LENGTH 14
// TZSP Header Structure
struct tzsp_header {
@@ -181,8 +188,12 @@ int main(int argc, char *argv[]) {
struct pcap_pkthdr header;
const u_char *packet;
const struct ip *ip_header;
char source_ip_str[INET_ADDRSTRLEN], dest_ip_str[INET_ADDRSTRLEN];
char source_ip_str[INET6_ADDRSTRLEN], dest_ip_str[INET6_ADDRSTRLEN];
struct ip *ip_header;
#ifdef ENABLE_IPV6
struct ip6_hdr *ip6_header;
#endif
int ip_protocol = 0;
printf("Using interface: %s\n", dev_name);
printf("Using filter: %s\n", filter_exp);
@@ -194,13 +205,37 @@ int main(int argc, char *argv[]) {
if (packet == NULL)
continue;
ip_header = (struct ip*)(packet + 14); // Assuming Ethernet header is 14 bytes
inet_ntop(AF_INET, &(ip_header->ip_src), source_ip_str, INET_ADDRSTRLEN);
inet_ntop(AF_INET, &(ip_header->ip_dst), dest_ip_str, INET_ADDRSTRLEN);
// Assuming Ethernet header is 14 bytes
// Check IP version
ip_header = (struct ip*)(packet + ETHERNET_HEADER_LENGTH);
ip_protocol = ip_header->ip_v;
if (verbose) {
printf("Packet: %s -> %s, IP Protocol: %d\n",
source_ip_str, dest_ip_str, ip_header->ip_p);
if (ip_protocol == 4) {
// IPv4
inet_ntop(AF_INET, &(ip_header->ip_src), source_ip_str, INET6_ADDRSTRLEN);
inet_ntop(AF_INET, &(ip_header->ip_dst), dest_ip_str, INET6_ADDRSTRLEN);
if (verbose) {
printf("IPv4 Packet: %s -> %s, IP Protocol: %d\n",
source_ip_str, dest_ip_str, ip_header->ip_p);
}
}
#ifdef ENABLE_IPV6
else if (ip_protocol == 6) {
// IPv6
ip6_header = (struct ip6_hdr*)(packet + ETHERNET_HEADER_LENGTH);
inet_ntop(AF_INET6, &(ip6_header->ip6_src), source_ip_str, INET6_ADDRSTRLEN);
inet_ntop(AF_INET6, &(ip6_header->ip6_dst), dest_ip_str, INET6_ADDRSTRLEN);
if (verbose) {
printf("IPv6 Packet: %s -> %s, Next Header: %d\n",
source_ip_str, dest_ip_str, ip6_header->ip6_nxt);
}
}
#endif
else {
printf("Non-IP Packet\n");
continue;
}
// Create TZSP Header