testsAndMisc/linux_configuration
Krzysztof kuhy Rudnicki 343d38eaf8
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feat: add Pi-hole-like LAN DNS blocking served from the PC (dnsmasq)
setup_dns_blocker.sh turns this PC into a DNS server that serves the
identical /etc/hosts blocklist to the whole LAN with no per-device app,
by feeding generate_hosts_file.sh output into dnsmasq via addn-hosts
(same StevenBlack variant + custom entries + unblocks). Adds status/
refresh subcommands, a daily refresh timer, Restart=always, and logging
to /var/log/dns-blocker/.

Because the ISP router cannot advertise a custom DNS server, a dhcp/
dhcp-off mode makes the PC the LAN DHCP server (static IP via nmcli with
a gateway-ping self-check and safe, always-online rollback), handing out
itself as the DNS server so every device is blocked automatically.

setup_wireguard_ssh.sh gains an allow-dns subcommand that opens DNS (53,
LAN saddr) and DHCP (67) in the single-owner nftables ruleset. The DHCP
accept rule is placed before 'ct state invalid drop' because the
0.0.0.0->255.255.255.255 DHCP broadcast is classified INVALID and was
otherwise dropped. Firewall detection now reads the actual loaded ruleset
(a ruleset can be loaded while nftables.service reads inactive) and avoids
a grep -q/pipefail SIGPIPE false-negative.

Verified end-to-end: Pixel-6a leased 192.168.1.82 with DNS 192.168.1.43;
youtube.com blocked, legit sites resolve. Regression tests added.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018pqSnrLt8QoWup7n2Ymk77
2026-07-10 19:02:46 +02:00
..
.githooks feat: great beautiful fixes 2026-02-20 01:17:53 +01:00
.github style: prettier formatting fixes 2026-05-15 01:15:52 +02:00
C/atop_agg fix(usage_report): stop charging atop's HZ field as CPU; bundle since-last-report mode 2026-06-04 18:13:47 +02:00
docs refactor(linux_configuration/scripts): split all scripts into single_use/ and periodic_background/ 2026-05-15 00:32:35 +02:00
dwm style: apply prettier formatting to evidence JSON and dwm/gaming READMEs 2026-06-14 07:22:04 +02:00
scripts feat: add Pi-hole-like LAN DNS blocking served from the PC (dnsmasq) 2026-07-10 19:02:46 +02:00
tests feat: add Pi-hole-like LAN DNS blocking served from the PC (dnsmasq) 2026-07-10 19:02:46 +02:00
zsh refactor: extract all inline Python from shell scripts into proper .py files 2026-06-06 10:31:48 +02:00
.gitignore feat: add self-hosted WireGuard+SSH remote access from Android, across networks 2026-06-21 20:07:13 +02:00
install_core_system.sh fix: PYTHONPATH in screen locker status check; sudo for steam enforcer install 2026-05-15 01:19:57 +02:00
test_results.log Add 'linux_configuration/' from commit '0762e3d07b90bac9256eb272de10bf9f42878094' 2026-02-06 21:43:26 +01:00