mirror of
https://github.com/kuhyx/testsAndMisc.git
synced 2026-11-11 21:34:05 +01:00
Krzysztof kuhy Rudnicki
ef892eb162
The focus system only ever filtered this phone's own traffic: /system/etc/hosts
via the system resolver, dns_enforcer and the curfew net layer via OUTPUT. A
tethered second phone's packets are FORWARDed + NAT'd through us on a path none
of that covers, so a second phone on the hotspot browses freely on our mobile
data and defeats focus mode.
Add tether_enforcer.sh: an always-on daemon that acts while focus mode is ON
(at home) or a force-test file is present, converging three levers each tick:
1. disable Android tether offload (settings global tether_offload_disabled=1,
snapshot/restore) so forwarded traffic goes through netfilter;
2. blanket REJECT of the FORWARD chain (iptables + ip6tables, FOCUS_TETHER_BLOCK
pinned at position 1), rebuilt only when tampered via a chain_intact gate so
it does not fork an `iptables -L` every second (that overheated the phone
during curfew-net tuning). Covers WiFi, USB and BT tethering;
3. best-effort `cmd wifi stop-softap` (Android 11+) so the hotspot visibly
flips off.
Reverts offload + tears down FORWARD on transition away from home / on SIGTERM.
Wiring: config.sh flags, focus_ctl.sh (tether-status/start/stop/log/test-on/off),
magisk_service.sh boot autostart, deploy.sh push/cp/restart. README section and
a working subprocess regression test (lib/tests/test_tether_enforcer.sh, 17/17).
Verified on-device (BL9000, Android 13): our REJECT jump sits ABOVE Android's
tetherctrl_FORWARD chain, tether_offload_disabled=1 took effect, and
`cmd wifi stop-softap` reports "Soft AP stopped successfully".
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Q6i3cdhKBoUrKxy4rmx6hH
124 lines
5.0 KiB
Bash
Executable File
124 lines
5.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Regression test for tether_enforcer.sh.
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#
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# The enforcer ends in `main "$@"` (an infinite loop), so — like a real deploy —
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# we run it as a subprocess with the Android tools it calls (settings, iptables,
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# ip6tables, cmd, getprop) replaced by stubs on PATH, and drive it through the
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# full gate + apply/revert state machine, asserting observable state each step.
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set -euo pipefail
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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SRC="$SCRIPT_DIR/../../tether_enforcer.sh"
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RUN="$(mktemp -d)"
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cleanup() {
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if [ -n "${PID:-}" ]; then
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kill "$PID" 2>/dev/null || true
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wait "$PID" 2>/dev/null || true # let its TERM handler finish before rm
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fi
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rm -rf "$RUN"
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}
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trap cleanup EXIT
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mkdir -p "$RUN/bin" "$RUN/state" "$RUN/ipt" "$RUN/settings" "$RUN/calls" "$RUN/app"
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STATE="$RUN/state"
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# --- fake config.sh in the daemon's own dir (it sources "$SCRIPT_DIR/config.sh") ---
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cp "$SRC" "$RUN/app/tether_enforcer.sh"
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cat > "$RUN/app/config.sh" <<EOF
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export STATE_DIR="$STATE"
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export MODE_FILE="$STATE/current_mode.txt"
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export TETHER_ENFORCER_ENABLED=1
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export TETHER_CHECK_INTERVAL=1
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export TETHER_LOG="$STATE/tether_enforcer.log"
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export TETHER_ENFORCER_STATE="$STATE/tether_applied"
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export TETHER_OFFLOAD_KEY="tether_offload_disabled"
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export TETHER_OFFLOAD_SNAP="$STATE/tether_offload.snap"
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export TETHER_IPT_CHAIN="FOCUS_TETHER_BLOCK"
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export TETHER_STOP_SOFTAP_ENABLED=1
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export TETHER_OVERRIDE_FILE="$STATE/tether_override"
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export TETHER_FORCE_FILE="$STATE/tether_force_on"
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EOF
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# --- stubs ---
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cat > "$RUN/bin/settings" <<EOF
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#!/usr/bin/env bash
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db="$RUN/settings/tether_offload_disabled"
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echo "settings \$*" >> "$RUN/calls/settings.log"
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case "\$1 \$2" in
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"get global") [ -f "\$db" ] && cat "\$db" || echo "null" ;;
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"put global") printf '%s' "\$4" > "\$db" ;;
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"delete global") rm -f "\$db" ;;
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esac
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exit 0
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EOF
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# iptables/ip6tables: minimal chain-state model so chain_intact converges.
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cat > "$RUN/bin/iptables" <<EOF
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#!/usr/bin/env bash
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bin="\$(basename "\$0")"; s="$RUN/ipt/\$bin"; mkdir -p "\$s"
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[ "\$1" = "-w" ] && shift 2
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case "\$1" in
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-L) [ -f "\$s/exists" ] ;;
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-N) touch "\$s/exists"; : > "\$s/rules" ;;
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-C) [ -f "\$s/jump" ] ;;
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-D) if [ -f "\$s/jump" ]; then rm -f "\$s/jump"; exit 0; else exit 1; fi ;;
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-I) touch "\$s/jump" ;;
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-A) echo "-A rule" >> "\$s/rules" ;;
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-F) : > "\$s/rules" ;;
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-S) cat "\$s/rules" 2>/dev/null ;;
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-X) rm -f "\$s/exists" "\$s/rules" "\$s/jump" ;;
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esac
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exit \$?
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EOF
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cp "$RUN/bin/iptables" "$RUN/bin/ip6tables"
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printf '#!/usr/bin/env bash\necho "cmd $*" >> "%s/calls/cmd.log"\nexit 0\n' "$RUN" > "$RUN/bin/cmd"
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printf '#!/usr/bin/env bash\necho 13\n' > "$RUN/bin/getprop"
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chmod +x "$RUN/bin/"*
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export PATH="$RUN/bin:$PATH"
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PASS=0; FAIL=0
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ok() { PASS=$((PASS + 1)); printf ' OK: %s\n' "$1"; }
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no() { FAIL=$((FAIL + 1)); printf ' FAIL: %s\n' "$1"; }
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applied() { [ -f "$STATE/tether_applied" ]; }
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offload() { cat "$RUN/settings/tether_offload_disabled" 2>/dev/null || echo "<unset>"; }
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v4jump() { [ -f "$RUN/ipt/iptables/jump" ]; }
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v6jump() { [ -f "$RUN/ipt/ip6tables/jump" ]; }
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v4rules() { grep -c '^-A' "$RUN/ipt/iptables/rules" 2>/dev/null || echo 0; }
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softap() { grep -c 'stop-softap' "$RUN/calls/cmd.log" 2>/dev/null || echo 0; }
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sh "$RUN/app/tether_enforcer.sh" & PID=$!
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sleep 2
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# [A] Away from home -> block OFF
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applied && no "A: applied while away" || ok "A: not applied while away"
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[ "$(offload)" = "<unset>" ] && ok "A: offload untouched away" || no "A: offload changed away"
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v4jump && no "A: v4 jump while away" || ok "A: no v4 jump while away"
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# [B] force-on -> block ENGAGES (all three levers)
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touch "$STATE/tether_force_on"; sleep 3
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applied && ok "B: applied on force" || no "B: not applied on force"
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[ "$(offload)" = "1" ] && ok "B: offload disabled" || no "B: offload=$(offload)"
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v4jump && ok "B: v4 FORWARD jump pinned" || no "B: no v4 jump"
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v6jump && ok "B: v6 FORWARD jump pinned" || no "B: no v6 jump"
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[ "$(v4rules)" = "1" ] && ok "B: single REJECT rule (no rebuild loop)" || no "B: v4 rules=$(v4rules)"
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[ "$(softap)" -ge 1 ] && ok "B: stop-softap invoked" || no "B: softap not stopped"
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[ "$(cat "$STATE/tether_offload.snap" 2>/dev/null)" = "null" ] && ok "B: offload snapshot captured" || no "B: bad snapshot"
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# [C] clear force -> block REVERTS
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rm -f "$STATE/tether_force_on"; sleep 3
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applied && no "C: still applied" || ok "C: reverted on force-clear"
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[ "$(offload)" = "<unset>" ] && ok "C: offload restored" || no "C: offload=$(offload)"
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v4jump && no "C: v4 jump remains" || ok "C: v4 chain torn down"
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# [D] current_mode=focus -> ENGAGES via home gate
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echo focus > "$STATE/current_mode.txt"; sleep 3
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applied && ok "D: applied at home (focus)" || no "D: not applied at home"
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v4jump && ok "D: v4 jump pinned at home" || no "D: no v4 jump at home"
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# [E] override -> SUSPENDS even at home
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touch "$STATE/tether_override"; sleep 3
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applied && no "E: applied despite override" || ok "E: suspended by override"
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v4jump && no "E: v4 jump despite override" || ok "E: torn down by override"
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printf '\n%d passed, %d failed\n' "$PASS" "$FAIL"
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[ "$FAIL" -eq 0 ]
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