nessi
e67174a4ae
Add NodeAgent and TrafficFlow models to track agent status and network flows, implement /agents/heartbeat endpoint to receive interface counters, conntrack flows, firewall status, and nftables ruleset hash from agents, add nexafabric-agent.py Python script to collect host telemetry including VM/LXC interface hints via tap/fwbr regex matching, conntrack flow parsing with protocol/state/byte counters, and pve-firewall status checks,
211 lines
7.0 KiB
Python
211 lines
7.0 KiB
Python
#!/usr/bin/env python3
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import argparse
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import hashlib
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import json
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import os
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import platform
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import re
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import socket
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import ssl
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import subprocess
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import time
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import urllib.error
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import urllib.request
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from datetime import datetime, timezone
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from pathlib import Path
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from typing import Any
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VERSION = "0.1.0"
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VM_INTERFACE_RE = re.compile(r"(?:tap|fwbr|fwln|fwpr)(\d+)")
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def read_text(path: str) -> str | None:
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try:
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return Path(path).read_text(encoding="utf-8").strip()
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except OSError:
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return None
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def run_command(args: list[str], timeout: int = 5) -> tuple[int, str]:
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try:
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result = subprocess.run(args, capture_output=True, text=True, timeout=timeout, check=False)
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return result.returncode, result.stdout.strip()
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except (OSError, subprocess.SubprocessError):
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return 127, ""
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def collect_interfaces() -> list[dict[str, Any]]:
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interfaces = []
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for item in Path("/sys/class/net").iterdir() if Path("/sys/class/net").exists() else []:
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name = item.name
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if name == "lo":
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continue
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vm_match = VM_INTERFACE_RE.search(name)
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interfaces.append(
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{
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"name": name,
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"vmid": vm_match.group(1) if vm_match else None,
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"operstate": read_text(f"/sys/class/net/{name}/operstate") or "unknown",
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"rx_bytes": int(read_text(f"/sys/class/net/{name}/statistics/rx_bytes") or 0),
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"tx_bytes": int(read_text(f"/sys/class/net/{name}/statistics/tx_bytes") or 0),
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"rx_packets": int(read_text(f"/sys/class/net/{name}/statistics/rx_packets") or 0),
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"tx_packets": int(read_text(f"/sys/class/net/{name}/statistics/tx_packets") or 0),
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}
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)
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return interfaces
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def parse_conntrack_line(line: str) -> dict[str, Any] | None:
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parts = line.split()
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if len(parts) < 5 or parts[0] not in {"tcp", "udp", "icmp"}:
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return None
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protocol = parts[0]
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state = None
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if protocol == "tcp" and len(parts) > 3 and "=" not in parts[3]:
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state = parts[3]
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values: dict[str, list[str]] = {}
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for part in parts:
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if "=" not in part:
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continue
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key, value = part.split("=", 1)
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values.setdefault(key, []).append(value)
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src_values = values.get("src", [])
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dst_values = values.get("dst", [])
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if not src_values or not dst_values:
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return None
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packet_values = [int(value) for value in values.get("packets", []) if value.isdigit()]
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byte_values = [int(value) for value in values.get("bytes", []) if value.isdigit()]
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sport = values.get("sport", [None])[0]
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dport = values.get("dport", [None])[0]
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return {
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"source_ip": src_values[0],
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"destination_ip": dst_values[0],
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"protocol": protocol,
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"source_port": int(sport) if sport and sport.isdigit() else None,
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"destination_port": int(dport) if dport and dport.isdigit() else None,
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"packets": sum(packet_values),
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"bytes": sum(byte_values),
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"state": state,
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}
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def collect_flows(limit: int = 500) -> list[dict[str, Any]]:
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code, output = run_command(["conntrack", "-L", "-o", "extended"], timeout=10)
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if code != 0 or not output:
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return []
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flows = []
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seen = set()
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for line in output.splitlines():
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flow = parse_conntrack_line(line)
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if not flow:
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continue
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key = (
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flow["source_ip"],
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flow["destination_ip"],
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flow["protocol"],
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flow.get("source_port"),
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flow.get("destination_port"),
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)
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if key in seen:
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continue
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seen.add(key)
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flows.append(flow)
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if len(flows) >= limit:
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break
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return flows
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def collect_conntrack() -> dict[str, Any]:
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code, output = run_command(["conntrack", "-C"])
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if code == 0 and output.isdigit():
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return {"count": int(output), "source": "conntrack"}
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for path in ("/proc/net/nf_conntrack", "/proc/net/ip_conntrack"):
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try:
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with open(path, "r", encoding="utf-8", errors="ignore") as handle:
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return {"count": sum(1 for _ in handle), "source": path}
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except OSError:
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continue
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return {"count": None, "source": "unavailable"}
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def collect_firewall() -> dict[str, Any]:
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status = {}
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code, output = run_command(["systemctl", "is-active", "pve-firewall"])
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status["pve_firewall"] = output if code == 0 else "unknown"
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code, output = run_command(["nft", "-j", "list", "ruleset"], timeout=10)
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if code == 0 and output:
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status["nft_ruleset_sha256"] = hashlib.sha256(output.encode("utf-8")).hexdigest()
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else:
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status["nft_ruleset_sha256"] = None
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return status
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def collect_payload(config: dict[str, Any]) -> dict[str, Any]:
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uptime = read_text("/proc/uptime")
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return {
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"version": VERSION,
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"node_name": config.get("node_name"),
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"collected_at": datetime.now(timezone.utc).isoformat(),
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"hostname": socket.gethostname(),
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"kernel": platform.release(),
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"uptime_seconds": float(uptime.split()[0]) if uptime else None,
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"loadavg": list(os.getloadavg()) if hasattr(os, "getloadavg") else [],
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"interfaces": collect_interfaces(),
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"flows": collect_flows(int(config.get("flow_limit", 500))),
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"conntrack": collect_conntrack(),
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"firewall": collect_firewall(),
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"extra": {"platform": platform.platform()},
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}
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def post_heartbeat(config: dict[str, Any], payload: dict[str, Any]) -> None:
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api_url = str(config["api_url"]).rstrip("/")
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data = json.dumps(payload).encode("utf-8")
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request = urllib.request.Request(
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f"{api_url}/agents/heartbeat",
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data=data,
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headers={
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"Authorization": f"Bearer {config['token']}",
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"Content-Type": "application/json",
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"User-Agent": f"nexafabric-agent/{VERSION}",
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},
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method="POST",
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)
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context = None
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if not bool(config.get("verify_tls", True)):
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context = ssl._create_unverified_context()
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with urllib.request.urlopen(request, timeout=15, context=context) as response:
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response.read()
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def load_config(path: str) -> dict[str, Any]:
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return json.loads(Path(path).read_text(encoding="utf-8"))
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def main() -> int:
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parser = argparse.ArgumentParser(description="NexaFabric Proxmox node telemetry agent")
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parser.add_argument("--config", default="/etc/nexafabric-agent/config.json")
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parser.add_argument("--once", action="store_true")
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args = parser.parse_args()
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config = load_config(args.config)
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interval = int(config.get("interval_seconds", 30))
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while True:
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payload = collect_payload(config)
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try:
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post_heartbeat(config, payload)
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print(f"heartbeat ok: {payload['collected_at']}", flush=True)
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except (OSError, urllib.error.URLError, urllib.error.HTTPError) as exc:
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print(f"heartbeat failed: {exc}", flush=True)
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if args.once:
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return 0
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time.sleep(interval)
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if __name__ == "__main__":
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raise SystemExit(main())
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