ip_changer/main.py at main · plaintextpackets/ip_changer · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
from scapy.all import *

def replace_ip_in_pcap(input_file, output_file, original_ip, new_ip):
    packets = rdpcap(input_file)
    modified_packets = []

    for packet in packets:
        if packet.haslayer(IP):
            if packet[IP].src == original_ip:
                packet[IP].src = new_ip
                del packet[IP].chksum  # Remove the checksum so Scapy recalculates it
            if packet[IP].dst == original_ip:
                packet[IP].dst = new_ip
                del packet[IP].chksum
            if packet.haslayer(TCP):
                del packet[TCP].chksum  # For TCP packets, remove the checksum for recalculation
            elif packet.haslayer(UDP):
                del packet[UDP].chksum  # For UDP packets, remove the checksum for recalculation
        modified_packets.append(packet)

    wrpcap(output_file, modified_packets)

# Example usage (original file, new file, original IP, new IP)

replace_ip_in_pcap("sip_sample.pcap", "modified.pcap", "200.57.7.204", "1.1.1.1")