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mukul975 27c6414ca5 Add folder anatomy (scripts/agent.py + references/api-reference.md) for 648 cybersecurity skills

Complete skill folder anatomy across all cybersecurity skills:
- scripts/agent.py: 80-150 line Python agents using real libraries (impacket,
  boto3, azure-mgmt-*, kubernetes, pefile, yara, scapy, shodan, stix2, etc.)
- references/api-reference.md: real API documentation with method signatures
- LICENSE: MIT license for all skill folders

2026-03-10 21:02:12 +01:00

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API Reference: VLAN Hopping Attack Agent

Overview

Tests VLAN segmentation effectiveness using scapy for DTP switch spoofing and 802.1Q double-tagging attacks in authorized penetration testing environments.

Dependencies

Package	Version	Purpose
scapy	>= 2.5	Packet crafting for DTP and Dot1Q frames
subprocess	stdlib	Interface management and modprobe

Core Functions

`listen_for_dtp(iface, timeout)`

Sniffs for DTP frames on the interface to detect trunk negotiation capability.

Returns: dict with dtp_frames_received, dtp_active, details

`listen_for_cdp_lldp(iface, timeout)`

Captures CDP and LLDP discovery frames to identify the connected switch.

Returns: dict with frames and switch_discovered

`send_dtp_desirable(iface, count)`

Sends DTP desirable frames to negotiate a trunk link on an access port.

Protocol: DTP multicast to 01:00:0c:cc:cc:cc
Returns: dict with frames_sent, type

`create_vlan_interface(iface, vlan_id, ip_addr)`

Creates 802.1Q VLAN subinterface after successful trunk negotiation.

Requires: 8021q kernel module
Returns: dict with vlan_interface, vlan_id, ip

`send_double_tagged(iface, outer_vlan, inner_vlan, target_ip)`

Crafts and sends double-tagged 802.1Q frames for VLAN hopping.

Note: Unidirectional attack - no return traffic expected
Returns: dict with VLAN IDs and target

`cleanup_vlan_interfaces(iface, vlan_ids)`

Removes VLAN subinterfaces created during testing.

`run_assessment(iface, target_vlans, target_ips)`

Full assessment: DTP listening, switch spoofing, double tagging, cleanup.

Scapy Layers Used

Layer	Purpose
`Ether`	Ethernet frame construction
`Dot1Q`	802.1Q VLAN tagging (single and double)
`LLC/SNAP`	DTP frame encapsulation
`IP/ICMP`	Test payload for VLAN reachability

Requirements

Root/sudo privileges for raw packet operations
Monitor mode or promiscuous mode capable interface
Authorization for target network testing

Usage

sudo python agent.py eth0

2.1 KiB Raw Blame History

API Reference: VLAN Hopping Attack Agent

Overview

Dependencies

Core Functions

listen_for_dtp(iface, timeout)

listen_for_cdp_lldp(iface, timeout)

send_dtp_desirable(iface, count)

create_vlan_interface(iface, vlan_id, ip_addr)

send_double_tagged(iface, outer_vlan, inner_vlan, target_ip)

cleanup_vlan_interfaces(iface, vlan_ids)

run_assessment(iface, target_vlans, target_ips)