feat(mini): per-protocol connectivity probe in hbc_mini.py
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Uc9V1v7iXruubpoLiSE24M
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Claude Sonnet 5
+312
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@@ -30,15 +30,17 @@ import re
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import shutil
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import signal
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import socket
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import struct
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import subprocess
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import sys
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import time
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import zlib
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from abc import ABC, abstractmethod
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from collections import defaultdict
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from dataclasses import asdict, dataclass
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from logging.handlers import SysLogHandler
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from pathlib import Path
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from typing import Any, Dict, List, Optional, Tuple
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from typing import Any, Awaitable, Callable, Dict, List, Optional, Set, Tuple
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# updated by scripts/bumpminor.sh
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__version__ = "5.4.4"
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@@ -637,6 +639,315 @@ class DiskMonitorPlugin(MonitorPlugin):
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return {"partitions": partitions} if partitions else {}
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# ---------------------------------------------------------------------------
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# Connectivity probe — per-protocol internet presence (IPv4 / IPv6)
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#
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# Tier 1 (every tier1_interval s, sends no packets): a UDP connect() to the probe address
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# shows whether a route exists and which source address would be used. Tier 2 (every
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# probe_interval s, sooner after a failure or a change of address or gateway): one ICMP echo,
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# only when tier 1 found a route. A family is absent after no route at all or fail_limit
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# consecutive failed echoes, present after one success, and unknown (flag omitted) when it
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# cannot be probed. The result rides on every HTB as p4/p6 and, when network_monitor runs, as
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# its `connectivity` metric. Mirrors hbd/client/connectivity.py.
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# ---------------------------------------------------------------------------
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_FAMILIES = ("ipv4", "ipv6")
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_FLAG_KEYS = {"ipv4": "p4", "ipv6": "p6"}
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_DEFAULT_PROBES = {"ipv4": "1.1.1.1", "ipv6": "2606:4700:4700::1111"}
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_BSD_PLATFORMS = ("darwin", "freebsd", "netbsd", "openbsd", "dragonfly")
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class _ProbeUnavailable(Exception):
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"""The address family cannot be probed on this host (e.g. no IPv6 support)."""
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class _PingUnavailable(Exception):
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"""The system ping binary could not be executed."""
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def _parse_proc_route_v4(text: str) -> Optional[str]:
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"""Default gateway from /proc/net/route (lowest metric wins)."""
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best: Optional[Tuple[int, str]] = None
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for line in text.splitlines()[1:]:
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f = line.split()
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if len(f) < 8 or f[1] != "00000000" or not int(f[3], 16) & 0x2:
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continue
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metric = int(f[6])
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if best is None or metric < best[0]:
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# the kernel prints the raw network-order u32 in host order: use the host byte order
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best = (metric, socket.inet_ntoa(int(f[2], 16).to_bytes(4, sys.byteorder)))
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return best[1] if best else None
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def _parse_proc_route_v6(text: str) -> Optional[str]:
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"""Default gateway from /proc/net/ipv6_route (lowest metric wins)."""
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best: Optional[Tuple[int, str]] = None
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for line in text.splitlines():
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f = line.split()
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if len(f) < 10:
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continue
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dest, plen, nexthop, metric, flags, iface = f[0], f[1], f[4], f[5], f[8], f[9]
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if dest != "0" * 32 or plen != "00" or nexthop == "0" * 32 or iface == "lo":
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continue
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fl = int(flags, 16)
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if not fl & 0x2 or fl & 0x200: # need RTF_GATEWAY, skip RTF_REJECT
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continue
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m = int(metric, 16)
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if best is None or m < best[0]:
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best = (m, socket.inet_ntop(socket.AF_INET6, bytes.fromhex(nexthop)))
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return best[1] if best else None
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def _parse_route_get(text: str) -> Optional[str]:
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"""Gateway from `route -n get [-inet6] default` (macOS and the BSDs)."""
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m = re.search(r"^\s*gateway:\s*(\S+)", text, re.MULTILINE)
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return m.group(1) if m else None
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def _parse_windows_route(text: str, family: str) -> Optional[str]:
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"""Default gateway from `route print -4` / `route print -6` (lowest metric wins)."""
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best: Optional[Tuple[int, str]] = None
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for line in text.splitlines():
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if family == "ipv4":
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f = line.split()
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if not (len(f) >= 5 and f[0] == "0.0.0.0" and f[1] == "0.0.0.0" and f[2] != "On-link"):
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continue
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cand = (int(f[4]), f[2])
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else:
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m = re.match(r"^\s*\d+\s+(\d+)\s+::/0\s+(\S+)\s*$", line)
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if not m or m.group(2) == "On-link":
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continue
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cand = (int(m.group(1)), m.group(2))
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if best is None or cand[0] < best[0]:
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best = cand
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return best[1] if best else None
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async def _run_cmd(cmd: List[str], timeout: float = 5.0) -> str:
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proc = await asyncio.create_subprocess_exec(
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*cmd, stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.DEVNULL)
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try:
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out, _ = await asyncio.wait_for(proc.communicate(), timeout=timeout)
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except asyncio.TimeoutError:
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proc.kill()
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await proc.wait()
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raise
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return out.decode(errors="replace")
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async def _default_gateway(family: str) -> Optional[str]:
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"""Default gateway for "ipv4"/"ipv6", or None on any failure (informational only)."""
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v4 = family == "ipv4"
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try:
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if sys.platform.startswith("linux"):
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with open("/proc/net/route" if v4 else "/proc/net/ipv6_route") as fh:
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text = fh.read()
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return _parse_proc_route_v4(text) if v4 else _parse_proc_route_v6(text)
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if sys.platform.startswith(_BSD_PLATFORMS):
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cmd = ["route", "-n", "get"] + ([] if v4 else ["-inet6"]) + ["default"]
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return _parse_route_get(await _run_cmd(cmd))
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if sys.platform == "win32":
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text = await _run_cmd(["route", "print", "-4" if v4 else "-6"])
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return _parse_windows_route(text, family)
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except Exception:
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return None
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return None
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def _probe_ping_command(host: str, family: str) -> List[str]:
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"""Command for ONE echo request with a ~2 s reply wait."""
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v4 = family == "ipv4"
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if sys.platform == "win32":
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return ["ping", "-n", "1", "-w", "2000", "-4" if v4 else "-6", host]
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if sys.platform.startswith(_BSD_PLATFORMS):
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# BSD/macOS -W is in milliseconds, and IPv6 is reached through ping6.
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return ["ping", "-c", "1", "-W", "2000", host] if v4 else ["ping6", "-c", "1", host]
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return ["ping", "-c", "1", "-W", "2", "-4" if v4 else "-6", host]
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def _parse_ping_rtt(output: str) -> Optional[float]:
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"""Average RTT in ms from ping output, or None when there was no reply."""
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m = re.search(r"(?:rtt|round-trip)\s+min/avg/max/\S+\s*=\s*([\d.]+)/([\d.]+)/([\d.]+)", output)
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if m:
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return float(m.group(2))
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if "TTL=" in output: # Windows reply line (also when localized)
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m = re.search(r"[=<]\s*(\d+)\s*ms", output)
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return float(m.group(1)) if m else 0.0
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return None
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async def _ping_rtt(target: str, family: str) -> Optional[float]:
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"""One ICMP echo; RTT in ms, or None if no reply. Raises _PingUnavailable without ping."""
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try:
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proc = await asyncio.create_subprocess_exec(
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*_probe_ping_command(target, family),
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stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE)
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except FileNotFoundError as e:
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raise _PingUnavailable(str(e))
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try:
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out, _ = await asyncio.wait_for(proc.communicate(), timeout=6)
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except asyncio.TimeoutError:
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proc.kill()
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await proc.wait()
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return None
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return _parse_ping_rtt(out.decode(errors="replace"))
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def _local_address(family: str, target: str) -> Optional[str]:
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"""Source address the kernel would use to reach target, or None if there is no route.
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A UDP connect() sends nothing. Raises _ProbeUnavailable if the family is unsupported.
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"""
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af = socket.AF_INET if family == "ipv4" else socket.AF_INET6
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try:
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sock = socket.socket(af, socket.SOCK_DGRAM)
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except OSError as e:
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raise _ProbeUnavailable(str(e))
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try:
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sock.connect((target, 9))
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return str(sock.getsockname()[0])
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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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@dataclass
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class _FamilyState:
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present: Optional[bool] = None # None = unknown (probe cannot run yet/at all)
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addr: Optional[str] = None
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gateway: Optional[str] = None
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rtt: Optional[float] = None
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class _Connectivity:
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def __init__(
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self,
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probes: Optional[Dict[str, str]] = None,
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probe_interval: float = 60.0,
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retry_interval: float = 10.0,
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tier1_interval: float = 5.0,
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fail_limit: int = 2,
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local_address_fn: Callable[[str, str], Optional[str]] = _local_address,
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ping_fn: Callable[[str, str], Awaitable[Optional[float]]] = _ping_rtt,
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gateway_fn: Callable[[str], Awaitable[Optional[str]]] = _default_gateway,
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clock: Callable[[], float] = time.monotonic,
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):
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self.probes = dict(_DEFAULT_PROBES)
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self.probes.update(probes or {})
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self.probe_interval = probe_interval
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self.retry_interval = retry_interval
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self.tier1_interval = tier1_interval
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self.fail_limit = fail_limit
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self._local_address = local_address_fn
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self._ping = ping_fn
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self._gateway_fn = gateway_fn
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self._clock = clock
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# Reading the gateway is a cheap /proc read on Linux but a subprocess elsewhere, so
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# elsewhere it is refreshed only when a tier-2 probe is due.
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self._cheap_gateway = sys.platform.startswith("linux")
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self.states: Dict[str, _FamilyState] = {f: _FamilyState() for f in _FAMILIES}
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self._fails: Dict[str, int] = {f: 0 for f in _FAMILIES}
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self._next_ping: Dict[str, float] = {f: 0.0 for f in _FAMILIES}
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self._last_key: Dict[str, Optional[Tuple[Optional[str], Optional[str]]]] = {
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f: None for f in _FAMILIES}
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self._ping_disabled: Set[str] = set()
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@classmethod
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def from_config(cls, cfg: Optional[Dict[str, Any]]) -> "_Connectivity":
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cfg = cfg or {}
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probes = {}
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if cfg.get("probe_v4"):
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probes["ipv4"] = str(cfg["probe_v4"])
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if cfg.get("probe_v6"):
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probes["ipv6"] = str(cfg["probe_v6"])
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return cls(probes=probes, probe_interval=float(cfg.get("probe_interval", 60)))
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# ---- readers (cheap; safe to call on every heartbeat) ---------------------------
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def snapshot(self) -> Dict[str, _FamilyState]:
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return {f: _FamilyState(**asdict(s)) for f, s in self.states.items()}
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def flags(self) -> Dict[str, bool]:
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"""HTB flags for families whose presence is known."""
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return {_FLAG_KEYS[f]: s.present for f, s in self.states.items() if s.present is not None}
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def as_metric(self) -> Dict[str, Dict[str, Any]]:
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return {f: asdict(s) for f, s in self.states.items()}
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# ---- probing ----------------------------------------------------------------------
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async def refresh(self) -> None:
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for fam in _FAMILIES:
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try:
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await self._refresh_family(fam)
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except Exception:
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logging.getLogger("hbc.probe").exception("connectivity probe failed for %s", fam)
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async def run(self) -> None:
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while _running:
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await self.refresh()
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await _sleep(self.tier1_interval)
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async def _gateway(self, fam: str) -> Optional[str]:
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try:
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return await self._gateway_fn(fam)
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except Exception:
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return None
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async def _refresh_family(self, fam: str) -> None:
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st = self.states[fam]
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try:
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addr = self._local_address(fam, self.probes[fam])
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except _ProbeUnavailable:
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st.present = None
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return
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if addr is None: # tier 1: no route => absent immediately
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self._fails[fam] = 0
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self._next_ping[fam] = 0.0
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self._last_key[fam] = None
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st.present, st.addr, st.gateway, st.rtt = False, None, None, None
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return
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now = self._clock()
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gw = await self._gateway(fam) if self._cheap_gateway else st.gateway
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key = (addr, gw)
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due = key != self._last_key[fam] or now >= self._next_ping[fam]
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if due and not self._cheap_gateway:
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gw = await self._gateway(fam)
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key = (addr, gw)
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st.addr, st.gateway = addr, gw
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self._last_key[fam] = key
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if fam in self._ping_disabled:
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st.present = None # cannot probe: unknown, never absent, while a route exists
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elif due:
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await self._tier2(fam, st, now)
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async def _tier2(self, fam: str, st: _FamilyState, now: float) -> None:
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try:
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rtt = await self._ping(self.probes[fam], fam)
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except _PingUnavailable:
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logging.getLogger("hbc.probe").warning("ping unavailable; %s presence stays unknown", fam)
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self._ping_disabled.add(fam)
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st.present = None
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return
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except (asyncio.TimeoutError, OSError):
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rtt = None
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if rtt is None:
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self._fails[fam] += 1
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self._next_ping[fam] = now + self.retry_interval
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if self._fails[fam] >= self.fail_limit:
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st.present, st.rtt = False, None
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else:
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self._fails[fam] = 0
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self._next_ping[fam] = now + self.probe_interval
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st.present, st.rtt = True, rtt
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# The running probe (None when probe_enabled is false); shared by the heartbeat sender and
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# the network_monitor plugin. Set in _async_main.
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_probe: Optional[_Connectivity] = None
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# ---------------------------------------------------------------------------
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# Plugin: network_monitor (Linux /proc/net/dev)
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# ---------------------------------------------------------------------------
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Block a user