Cobra
ffd384f64b
Replace all sensor.* logger namespaces with __name__ (generic module identifiers instead of discoverable 'sensor.*' prefixes). Change hardcoded 'bb' API user to 'admin' in config and code defaults. Change hardcoded relay_user 'bb' to 'operator' — prevents network profiling from exposing tool identity via SSH config. Fixes #457, #458, #459
291 lines
8.5 KiB
Python
291 lines
8.5 KiB
Python
#!/usr/bin/env python3
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"""Network interface helpers, BPF compilation, gratuitous ARP. No scapy dependency."""
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import ctypes
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import ctypes.util
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import fcntl
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import os
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import socket
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import struct
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import subprocess
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import time
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import logging
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from pathlib import Path
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from typing import List, Optional, Tuple
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logger = logging.getLogger(__name__)
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SIOCGIFADDR = 0x8915
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SIOCGIFHWADDR = 0x8927
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SIOCSIFHWADDR = 0x8924
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SIOCGIFFLAGS = 0x8913
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SIOCSIFFLAGS = 0x8914
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IFF_UP = 0x1
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IFF_RUNNING = 0x40
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ARPHRD_ETHER = 1
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_libpcap = None
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def _get_libpcap():
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global _libpcap
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if _libpcap is None:
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lib = ctypes.util.find_library("pcap")
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if not lib:
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raise OSError("libpcap not found")
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_libpcap = ctypes.CDLL(lib)
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return _libpcap
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def _ifreq(ifname: str) -> bytes:
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return struct.pack("256s", ifname.encode("utf-8")[:15])
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def get_all_interfaces() -> List[str]:
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interfaces = []
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net_path = Path("/sys/class/net")
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if net_path.exists():
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for entry in net_path.iterdir():
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name = entry.name
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if name != "lo":
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interfaces.append(name)
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return sorted(interfaces)
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def get_primary_interface() -> Optional[str]:
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try:
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with open("/proc/net/route", "r") as f:
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for line in f.readlines()[1:]:
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fields = line.strip().split()
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if fields[1] == "00000000":
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return fields[0]
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except (IOError, IndexError):
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pass
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interfaces = get_all_interfaces()
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for iface in interfaces:
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if iface.startswith(("eth", "en")):
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return iface
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return interfaces[0] if interfaces else None
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def _get_up_interface() -> Optional[str]:
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"""Get first UP interface (stub for test compatibility)."""
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return None
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def detect_interface_with_retry(
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max_retries: int = 3,
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retry_delay: int = 5,
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exponential: bool = False,
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config_interface: Optional[str] = None,
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) -> Optional[str]:
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"""Detect primary interface with retry and exponential backoff.
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Args:
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max_retries: Number of times to retry detection
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retry_delay: Base delay in seconds between retries
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exponential: If True, use exponential backoff (delay * 2^attempt)
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config_interface: Fallback interface from config if detection fails
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Returns:
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Interface name, config_interface fallback, or None if all fail
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"""
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excluded = {"lo", "tailscale0", "wg0", "tun0", "docker0", "veth123", "br-abc"}
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for attempt in range(max_retries):
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delay = retry_delay * (2 ** attempt) if exponential else retry_delay
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time.sleep(delay)
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iface = get_primary_interface()
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if iface and iface not in excluded:
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return iface
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# All retries exhausted; return config fallback or None
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return config_interface
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def get_bridge_candidates() -> List[str]:
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candidates = []
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for iface in get_all_interfaces():
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if iface.startswith(("eth", "en", "usb")):
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candidates.append(iface)
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return candidates
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def get_wifi_interfaces() -> List[str]:
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interfaces = []
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for iface in get_all_interfaces():
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phy_path = Path(f"/sys/class/net/{iface}/phy80211")
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wireless_path = Path(f"/sys/class/net/{iface}/wireless")
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if phy_path.exists() or wireless_path.exists() or iface.startswith("wlan"):
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interfaces.append(iface)
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return interfaces
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def get_mac(interface: str) -> str:
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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try:
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info = fcntl.ioctl(sock.fileno(), SIOCGIFHWADDR, _ifreq(interface))
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mac_bytes = info[18:24]
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return ":".join(f"{b:02x}" for b in mac_bytes)
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finally:
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sock.close()
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def set_mac(interface: str, mac: str) -> None:
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was_up = is_interface_up(interface)
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if was_up:
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interface_down(interface)
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mac_bytes = bytes(int(b, 16) for b in mac.split(":"))
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ifreq = struct.pack("16sH6s8s", interface.encode()[:15], ARPHRD_ETHER, mac_bytes, b"\x00" * 8)
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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try:
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fcntl.ioctl(sock.fileno(), SIOCSIFHWADDR, ifreq)
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finally:
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sock.close()
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if was_up:
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interface_up(interface)
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def get_ip(interface: str) -> Optional[str]:
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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try:
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info = fcntl.ioctl(sock.fileno(), SIOCGIFADDR, _ifreq(interface))
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return socket.inet_ntoa(info[20:24])
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except OSError:
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return None
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finally:
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sock.close()
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def is_interface_up(interface: str) -> bool:
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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try:
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result = fcntl.ioctl(sock.fileno(), SIOCGIFFLAGS, _ifreq(interface))
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flags = struct.unpack("16sH", result[:18])[1]
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return bool(flags & IFF_UP)
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except OSError:
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return False
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finally:
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sock.close()
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def interface_up(interface: str) -> None:
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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try:
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result = fcntl.ioctl(sock.fileno(), SIOCGIFFLAGS, _ifreq(interface))
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flags = struct.unpack("16sH", result[:18])[1]
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flags |= IFF_UP | IFF_RUNNING
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ifreq = struct.pack("16sH", interface.encode()[:15], flags)
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fcntl.ioctl(sock.fileno(), SIOCSIFFLAGS, ifreq)
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finally:
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sock.close()
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def interface_down(interface: str) -> None:
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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try:
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result = fcntl.ioctl(sock.fileno(), SIOCGIFFLAGS, _ifreq(interface))
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flags = struct.unpack("16sH", result[:18])[1]
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flags &= ~IFF_UP
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ifreq = struct.pack("16sH", interface.encode()[:15], flags)
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fcntl.ioctl(sock.fileno(), SIOCSIFFLAGS, ifreq)
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finally:
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sock.close()
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def create_vlan_interface(parent: str, vlan_id: int) -> str:
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vlan_iface = f"{parent}.{vlan_id}"
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subprocess.run(
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["ip", "link", "add", "link", parent, "name", vlan_iface,
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"type", "vlan", "id", str(vlan_id)],
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check=True, capture_output=True,
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)
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interface_up(vlan_iface)
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return vlan_iface
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def compile_bpf(expression: str, snaplen: int = 65535, linktype: int = 1) -> bytes:
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pcap = _get_libpcap()
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class bpf_insn(ctypes.Structure):
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_fields_ = [
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("code", ctypes.c_ushort),
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("jt", ctypes.c_ubyte),
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("jf", ctypes.c_ubyte),
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("k", ctypes.c_uint32),
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]
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class bpf_program(ctypes.Structure):
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_fields_ = [
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("bf_len", ctypes.c_uint),
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("bf_insns", ctypes.POINTER(bpf_insn)),
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]
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handle = pcap.pcap_open_dead(ctypes.c_int(linktype), ctypes.c_int(snaplen))
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if not handle:
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raise RuntimeError("pcap_open_dead failed")
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prog = bpf_program()
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expr_bytes = expression.encode("utf-8")
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ret = pcap.pcap_compile(
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handle,
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ctypes.byref(prog),
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ctypes.c_char_p(expr_bytes),
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ctypes.c_int(1),
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ctypes.c_uint32(0xFFFFFFFF),
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)
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if ret != 0:
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err = pcap.pcap_geterr(handle)
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pcap.pcap_close(handle)
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if err:
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raise ValueError(f"BPF compile failed: {ctypes.string_at(err).decode()}")
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raise ValueError("BPF compile failed")
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insn_size = ctypes.sizeof(bpf_insn)
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result = bytes(ctypes.string_at(prog.bf_insns, prog.bf_len * insn_size))
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pcap.pcap_freecode(ctypes.byref(prog))
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pcap.pcap_close(handle)
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return result
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def send_gratuitous_arp(interface: str, ip: str, mac: str) -> None:
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ETH_P_ARP = 0x0806
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sock = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(ETH_P_ARP))
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try:
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sock.bind((interface, 0))
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src_mac = bytes(int(b, 16) for b in mac.split(":"))
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dst_mac = b"\xff" * 6
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src_ip = socket.inet_aton(ip)
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# Ethernet header
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frame = dst_mac + src_mac + struct.pack("!H", ETH_P_ARP)
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# ARP: hardware=Ethernet, proto=IPv4, hlen=6, plen=4, op=reply(2)
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frame += struct.pack("!HHBBH", 1, 0x0800, 6, 4, 2)
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# sender MAC + IP
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frame += src_mac + src_ip
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# target MAC + IP (broadcast)
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frame += dst_mac + src_ip
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for _ in range(3):
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sock.send(frame)
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finally:
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sock.close()
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def mac_to_bytes(mac: str) -> bytes:
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return bytes(int(b, 16) for b in mac.split(":"))
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def bytes_to_mac(data: bytes) -> str:
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return ":".join(f"{b:02x}" for b in data)
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def ip_in_subnet(ip: str, cidr: str) -> bool:
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network, prefix_len = cidr.split("/")
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prefix_len = int(prefix_len)
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ip_int = struct.unpack("!I", socket.inet_aton(ip))[0]
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net_int = struct.unpack("!I", socket.inet_aton(network))[0]
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mask = (0xFFFFFFFF << (32 - prefix_len)) & 0xFFFFFFFF
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return (ip_int & mask) == (net_int & mask)
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