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Anthropic-Cybersecurity-Skills/skills/performing-packet-injection-attack/references/api-reference.md
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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: Packet Injection Attack

Scapy Python API

from scapy.all import IP, TCP, UDP, ICMP, Raw, sr1, send

# Craft and send TCP SYN
pkt = IP(dst="10.10.20.10") / TCP(dport=80, flags="S")
resp = sr1(pkt, timeout=2, verbose=0)

# Send without waiting for response
send(pkt, verbose=0)

# Fragment a packet
from scapy.all import fragment
frags = fragment(IP(dst="10.10.20.10") / ICMP() / Raw(load="X"*65500))
send(frags, verbose=0)

Scapy Packet Layers

Layer Fields Example
IP src, dst, ttl, flags, frag IP(dst="10.0.0.1", ttl=64)
TCP sport, dport, flags, seq, ack TCP(dport=80, flags="S")
UDP sport, dport UDP(dport=53)
ICMP type, code ICMP(type=8)
DNS qd, rd DNS(rd=1, qd=DNSQR(qname="test.com"))

TCP Flag Values

Flag Value Description
S SYN Connection initiation
A ACK Acknowledgment
F FIN Connection termination
R RST Connection reset
P PSH Push data
U URG Urgent pointer

hping3 CLI

Command Description
hping3 -S -p 80 <target> Send SYN packets
hping3 -S --flood -c 100 <target> Limited SYN flood test
hping3 -S -p 80 -w 0 <target> Zero window test

Python Libraries

Library Version Purpose
scapy >=2.5 Packet crafting, sending, and receiving

References