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from pathlib import Path
from typing import List, Tuple, Dict, Any
from scapy.all import rdpcap, IP, TCP, UDP, ICMP, DNS, Raw
from faker import Faker
from models import PacketRecord, TaskConfig, GroundTruth
fake = Faker()
def parse_packets(pcap_path: str) -> Tuple[List[PacketRecord], GroundTruth]:
packets = []
ground_truth = GroundTruth(
malicious_packets=[],
packet_roles={},
sessions={},
session_roles={},
entry_point=None,
)
try:
scapy_packets = rdpcap(pcap_path)
except FileNotFoundError:
return packets, ground_truth
except Exception as e:
print(f"Error reading PCAP: {e}")
return packets, ground_truth
for idx, pkt in enumerate(scapy_packets):
if IP not in pkt:
continue
ip_layer = pkt[IP]
src_ip = ip_layer.src
dst_ip = ip_layer.dst
src_port = 0
dst_port = 0
protocol = "OTHER"
flags = []
if TCP in pkt:
protocol = "TCP"
tcp_layer = pkt[TCP]
src_port = tcp_layer.sport
dst_port = tcp_layer.dport
flags = []
if tcp_layer.flags & 0x02:
flags.append("SYN")
if tcp_layer.flags & 0x10:
flags.append("ACK")
if tcp_layer.flags & 0x01:
flags.append("FIN")
if tcp_layer.flags & 0x04:
flags.append("RST")
if tcp_layer.flags & 0x08:
flags.append("PSH")
elif UDP in pkt:
protocol = "UDP"
udp_layer = pkt[UDP]
src_port = udp_layer.sport
dst_port = udp_layer.dport
elif ICMP in pkt:
protocol = "ICMP"
elif DNS in pkt:
protocol = "DNS"
dst_port = 53
raw_payload = b""
if Raw in pkt:
raw_payload = bytes(pkt[Raw].load)
elif bytes(ip_layer.payload):
raw_payload = bytes(ip_layer.payload)
payload_size = len(ip_layer.payload) if ip_layer else 0
payload_preview = ""
full_payload = None
if raw_payload[:20]:
payload_preview = raw_payload[:20].hex()[:40]
try:
full_payload = raw_payload.decode("utf-8", errors="replace")
except Exception:
full_payload = raw_payload.hex()
packets.append(PacketRecord(
packet_id=f"pkt_{idx+1:04d}",
timestamp=float(pkt.time) if hasattr(pkt, 'time') else float(idx),
src_ip=src_ip,
dst_ip=dst_ip,
src_port=src_port,
dst_port=dst_port,
protocol=protocol,
payload_size=payload_size,
ttl=ip_layer.ttl if hasattr(ip_layer, 'ttl') else 64,
flags=flags,
is_revealed=False,
payload_preview=payload_preview,
full_payload=full_payload,
))
return packets, ground_truth
def load_task_annotation(annotation_path: str) -> Dict[str, Any]:
path = Path(annotation_path)
if not path.exists():
return {}
with open(path, 'r') as f:
return json.load(f)
class RealPCAPGenerator:
def __init__(self, config: TaskConfig, annotation: Dict[str, Any]):
self.config = config
self.annotation = annotation
self.pcap_file = annotation.get("pcap_file", "")
def generate(self, seed: int = None) -> Tuple[List[PacketRecord], GroundTruth]:
if not self.pcap_file:
return [], GroundTruth()
base_dir = Path(__file__).parent.parent / "pcaps"
pcap_path = base_dir / self.pcap_file
packets, ground_truth = parse_packets(str(pcap_path))
malicious_ids = [self._normalize_packet_id(pid) for pid in self.annotation.get("malicious_packets", [])]
packet_roles = {
self._normalize_packet_id(pid): role
for pid, role in self.annotation.get("packet_roles", {}).items()
}
sessions = {
session_name: [self._normalize_packet_id(pid) for pid in packet_ids]
for session_name, packet_ids in self.annotation.get("sessions", {}).items()
}
session_roles = {
session_name: role
for session_name, role in self.annotation.get("session_roles", {}).items()
}
ground_truth.malicious_packets = malicious_ids
ground_truth.packet_roles = packet_roles
ground_truth.sessions = sessions
ground_truth.session_roles = session_roles
entry_point = self.annotation.get("entry_point")
ground_truth.entry_point = self._normalize_packet_id(entry_point) if entry_point else None
packet_lookup = {packet.packet_id: packet for packet in packets}
for packet_id in malicious_ids:
packet = packet_lookup.get(packet_id)
if packet:
packet.is_malicious = True
packet.attack_role = packet_roles.get(packet_id)
return packets, ground_truth
@staticmethod
def _normalize_packet_id(value: Any) -> str:
text = str(value)
if text.startswith("pkt_"):
return text
if text.isdigit():
return f"pkt_{int(text):04d}"
return text
class PCAPGenerator:
def __init__(self, config: TaskConfig, annotation: Dict[str, Any] = None):
self.config = config
self.annotation = annotation or {}
def generate(self, seed: int = None) -> Tuple[List[PacketRecord], GroundTruth]:
pcap_file = getattr(self.config, 'pcap_file', None)
if pcap_file:
annotation_path = Path(__file__).parent.parent / "pcaps" / f"{pcap_file}.json"
self.annotation = load_task_annotation(str(annotation_path))
return RealPCAPGenerator(self.config, self.annotation).generate(seed)
rng = __import__('random').Random(seed or self.config.seed)
packets = []
ground_truth = GroundTruth(
malicious_packets=[],
packet_roles={},
sessions={},
session_roles={},
entry_point=None,
)
attacker_ip = f"10.{rng.randint(1, 254)}.{rng.randint(1, 254)}.{rng.randint(1, 254)}"
target_network = "192.168.1"
target_ip = f"{target_network}.{rng.randint(1, 254)}"
scan_count = int(self.config.total_packets * 0.1)
for i in range(scan_count):
pkt_id = f"pkt_{i+1:04d}"
packets.append(PacketRecord(
packet_id=pkt_id,
timestamp=1000.0 + i * 0.001,
src_ip=attacker_ip,
dst_ip=f"{target_network}.{i+1}",
src_port=rng.randint(40000, 60000),
dst_port=i + 1,
protocol="TCP",
payload_size=0,
ttl=rng.randint(32, 64),
flags=["SYN"],
is_revealed=False,
payload_preview="",
is_malicious=True,
attack_role="scan",
))
ground_truth.malicious_packets.append(pkt_id)
ground_truth.packet_roles[pkt_id] = "scan"
ground_truth.scan_packets.append(pkt_id)
if i == 0:
ground_truth.entry_point = pkt_id
c2_count = int(self.config.total_packets * 0.3)
c2_port = 4444
for i in range(c2_count):
pkt_id = f"pkt_{scan_count + i+1:04d}"
packets.append(PacketRecord(
packet_id=pkt_id,
timestamp=1001.0 + i * 1.0,
src_ip=attacker_ip,
dst_ip=target_ip,
src_port=rng.randint(40000, 60000),
dst_port=c2_port,
protocol="TCP",
payload_size=rng.randint(32, 128),
ttl=128,
flags=["PSH", "ACK"],
is_revealed=False,
payload_preview=fake.sha256()[:20],
is_malicious=True,
attack_role="c2",
))
ground_truth.malicious_packets.append(pkt_id)
ground_truth.packet_roles[pkt_id] = "c2"
noise_count = int(self.config.total_packets * 0.6)
base_idx = scan_count + c2_count
for i in range(noise_count):
protocol = rng.choice(["TCP", "UDP", "DNS", "HTTPS"])
pkt_id = f"pkt_{base_idx + i+1:04d}"
if protocol == "DNS":
dst_ip = "8.8.8.8"
dst_port = 53
elif protocol == "HTTPS":
dst_ip = fake.ipv4()
dst_port = 443
else:
dst_ip = target_ip
dst_port = rng.choice([80, 443, 445, 3389])
packets.append(PacketRecord(
packet_id=pkt_id,
timestamp=1000.0 + rng.uniform(0, 100),
src_ip=target_ip if rng.random() > 0.3 else fake.ipv4(),
dst_ip=dst_ip,
src_port=rng.randint(40000, 60000),
dst_port=dst_port,
protocol=protocol,
payload_size=rng.randint(40, 1500),
ttl=rng.choice([64, 128, 255]),
flags=[],
is_revealed=False,
payload_preview="",
is_malicious=False,
))
packets.sort(key=lambda p: p.timestamp)
for i, p in enumerate(packets):
p.packet_id = f"pkt_{i+1:04d}"
return packets, ground_truth
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