The pcap_hex function within the mock-jutsu library is a specialised tool designed for security researchers, network engineers, and software testers who require high-fidelity network traffic simulations. This function generates a hexadecimal representation of a mock network packet, specifically structured as an Ethernet frame encapsulating an IPv4 datagram and a TCP segment. By providing a Wireshark-style hex dump, mock-jutsu enables developers to simulate complex network interactions without the logistical burden of capturing live traffic or managing bulky binary files, making it an essential component for modern security testing workflows.
When generating test data with pcap_hex, the library meticulously follows established networking standards to ensure realism. Each output string adheres to the byte-level specifications defined by IEEE 802.3 for Ethernet frames, RFC 791 for Internet Protocol version 4, and RFC 793 for the Transmission Control Protocol. The resulting hex dump is formatted as a series of space-separated byte pairs, such as "ff ff 08 00 45 00", which is the industry-standard format for packet analysis. This level of precision ensures that the mock data is fully compatible with packet dissection engines, Intrusion Detection Systems (IDS), and custom protocol parsers, allowing them to process the generated strings as if they were genuine packets intercepted from a physical wire.
Integrating pcap_hex into an existing development environment is seamless, regardless of the preferred tooling. Python developers can easily incorporate packet generation into their test suites using the jutsu.generate('pcap_hex') method. For those focused on performance and load testing, the function is available in JMeter via the ${__mockjutsu(pcap_hex,)} expression. Additionally, the mock-jutsu CLI offers a quick way to produce data on the fly with the command "mockjutsu generate pcap_hex", which is ideal for shell scripting and rapid prototyping. This multi-platform support ensures that teams can maintain consistent test data across different stages of the Secure Software Development Lifecycle (SSDLC).
The primary advantage of using pcap_hex lies in its ability to facilitate rigorous security validation and debugging. Developers can use this function to verify how their applications respond to specific TCP flag combinations, header configurations, or payload structures in a sandboxed environment. Because the mock data is generated programmatically, it removes the privacy and security risks often associated with using sanitised production captures. Ultimately, mock-jutsu empowers organisations to build more robust and resilient network infrastructure by providing a reliable, reproducible, and scalable method for generating sophisticated packet-level telemetry.
mockjutsu generate pcap_hexmockjutsu bulk pcap_hex --count 10mockjutsu export pcap_hex --count 10 --format jsonmockjutsu export pcap_hex --count 10 --format csvmockjutsu export pcap_hex --count 10 --format sqlfrom mockjutsu import jutsujutsu.generate('pcap_hex')jutsu.bulk('pcap_hex', count=10)jutsu.template(['pcap_hex'], count=5)${__mockjutsu_security(pcap_hex)}# JMeter Function: __mockjutsu_security# Parameter 1: pcap_hex# Parameter 2: (not required for this function)GET /generate/pcap_hex# → {"type":"pcap_hex","result":"...","status":"ok"}GET /bulk/pcap_hex?count=10POST /template {"types":["pcap_hex"],"count":1}Example Output
d4 c3 b2 a1 02 00 04 00 00 00 00 00 00 00 00 00
ff ff 00 00 01 00 00 00 1b 5b 40 6a 00 00 00 00
78 00 00 00 78 00 00 00 d6 3d 5a 59 46 57 41 7b
05 ca d7 29 08 00 45 00 00 6a ef de 40 00 40 06
00 00 96 08 d0 0b af 34 a9 77 3c 70 15 38 d9 de
ec fc 6e fc dd 94 50 18 ff ff 00 00 00 00 47 45
54 20 2f 20 48 54 54 50 2f 31 2e 31 0d 0a 48 6f
73 74 3a 20 61 70 69 2e 65 78 61 6d 70 6c 65 2e
63 6f 6d 0d 0a 55 73 65 72 2d 41 67 65 6e 74 3a
20 4d 6f 7a 69 6c 6c 61 2f 35 2e 30 0d 0a 0d 0aValidation Rules
- Generated following real format specifications
- All values are fully synthetic
- For development, testing, and demonstration only