netops · Update DNS probe interval and socket timeout defaults a4f9c2e · 3 days ago

📁	src	Update DNS probe interval and socket timeout defaults	3 days ago
📁	systemd	Harden systemd service unit capabilities	2 weeks ago
📄	CHANGELOG.md	Release v1.4.2	2 weeks ago
📄	LICENSE	Initial commit	7 months ago
📄	README.md	Document systemd socket activation flags	1 month ago

README.md

netprobe

Lightweight ICMP, TCP connect, and local DNS resolver probe daemon designed for Debian/Linux edge gateways. Emits Prometheus-compatible textfile metrics with minimal CPU and memory overhead.

Features

Non-blocking IPv4/IPv6 TCP connect latency probes
UDP DNS A/AAAA resolution timing against local dnsmasq / dnscrypt-proxy
Zero external runtime dependencies (pure C11 + POSIX sockets)
Hardened systemd unit with CAP_NET_RAW only when ICMP mode is enabled

Build & Install

cc -O2 -Wall -Wextra -std=c11 src/probe.c -o netprobe
install -m 0755 netprobe /usr/local/bin/netprobe
install -m 0644 systemd/netprobe.service /etc/systemd/system/
systemctl enable --now netprobe

Usage

netprobe --dns 127.0.0.1:53 --target 1.1.1.1:443 --interval 15