- 1 year ago
Getting Npcap IPv6 source and destination addresses
To retrieve the source and destination IPv6 addresses using Npcap in a Windows environment, you can use the WinPcap/Npcap API along with the appropriate data structures. Here's an example of how you can accomplish this in C++:
cpp#include <iostream>
#include <pcap.h>
#include <Packet32.h>
#include <iphlpapi.h>
#include <stdio.h>
// Structure to hold IPv6 address
typedef struct _IPV6_ADDR {
BYTE Byte[16];
} IPV6_ADDR;
// Function to print an IPv6 address
void PrintIPv6Address(IPV6_ADDR address) {
for (int i = 0; i < 16; i += 2) {
printf("%02X%02X", address.Byte[i], address.Byte[i + 1]);
if (i != 14) {
printf(":");
}
}
printf("\n");
}
int main() {
pcap_if_t* allDevs;
pcap_if_t* dev;
char errbuf[PCAP_ERRBUF_SIZE];
int ret = pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL, &allDevs, errbuf);
if (ret == -1) {
printf("Error finding devices: %s\n", errbuf);
return 1;
}
// Iterate through the available devices
for (dev = allDevs; dev != NULL; dev = dev->next) {
// Open the device
pcap_t* handle = pcap_open(dev->name, 65536, PCAP_OPENFLAG_PROMISCUOUS, 1000, NULL, errbuf);
if (handle == NULL) {
printf("Error opening device %s: %s\n", dev->name, errbuf);
continue;
}
// Start capturing packets
pcap_pkthdr* header;
const u_char* packet;
int res;
while ((res = pcap_next_ex(handle, &header, &packet)) >= 0) {
if (res == 0) continue;
// Retrieve IPv6 source and destination addresses
ip6_hdr* ipv6Header = (ip6_hdr*)(packet + 14); // Assuming Ethernet header is present
IPV6_ADDR sourceAddress;
memcpy(&sourceAddress, &ipv6Header->ip6_src, sizeof(IPV6_ADDR));
IPV6_ADDR destAddress;
memcpy(&destAddress, &ipv6Header->ip6_dst, sizeof(IPV6_ADDR));
// Print the IPv6 addresses
printf("Source: ");
PrintIPv6Address(sourceAddress);
printf("Destination: ");
PrintIPv6Address(destAddress);
printf("----------------------\n");
}
// Close the capture handle
pcap_close(handle);
}
// Free the device list
pcap_freealldevs(allDevs);
return 0;
}
Make sure to link against the necessary libraries (Packet.lib
, Wpcap.lib
, Iphlpapi.lib
) and include the appropriate header files (pcap.h
, Packet32.h
, iphlpapi.h
) in your C++ project.
The code uses the pcap_findalldevs_ex
function to retrieve a list of available network devices. It then iterates through the devices, opens each one using pcap_open
, and captures packets using pcap_next_ex
. The IPv6 source and destination addresses are extracted from the packet's IPv6 header (ip6_hdr
structure) and printed using the PrintIPv6Address
function.
Please note that you need to have Npcap installed on your system for this code