mirror of
https://github.com/kuhyx/testsAndMisc.git
synced 2026-11-11 16:34:06 +01:00
Krzysztof Rudnicki
287512f011
Android's Wireless debugging is deliberately ephemeral: the listener dies when you leave the settings screen or the device sleeps, and it picks a new random port each time. In one session it offered 35545, then 40401, then 43781, and vanished entirely twice. Every deploy therefore started with tapping through Settings and reading a port off the screen. enable_persistent_adb.sh waits for any such transient window, then uses it to pin adbd to port 5555 - the port deploy.sh has always assumed - and installs a Magisk service.d boot script so the same happens on every boot. The phone is on DHCP with no reservation, so the script identifies it by MAC rather than trusting a hardcoded address: a ping sweep populates the neighbour table and the address is looked up there. That beats a router reservation because it needs no router access and works on any network. One bug worth naming: the first version took the first `device` line from `adb devices`. Pairing also leaves an mDNS _adb-tls-connect._tcp entry for the same phone, so it reported port 5555 as reachable while nmap showed it closed. It now matches the exact ip:port. Verified: nmap showed 5555 closed then open across the switch; a run against a deliberately wrong IP reported "phone moved" and connected; and after `adb reboot` the script connected with no arguments and no interaction, with /proc/uptime at 149s and service.adb.tcp.port reading 5555, so the boot script really ran. shellcheck clean. Trade-off accepted by the user: adbd on a fixed port is reachable to anything on the LAN, though it still requires an authorised key. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
52 lines
3.5 KiB
JSON
52 lines
3.5 KiB
JSON
{
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"intent": "Let the laptop reach the phone over adb at any time without anyone opening Settings, tapping a pairing dialog, or reading a port off the screen.",
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"scope": [
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"phone_focus_mode/enable_persistent_adb.sh - new script",
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"On-device: /data/adb/service.d/99-adb-tcp-5555.sh - new Magisk boot script",
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"Non-goal: no change to deploy.sh, which already assumes port 5555",
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"Non-goal: no router DHCP reservation - MAC discovery replaces the need for one"
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],
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"changes": [
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"Wait for any transient Wireless debugging window (trying a known port first, then an nmap sweep of the ephemeral range), then use it to setprop service.adb.tcp.port=5555 and restart adbd.",
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"Install a Magisk service.d boot script that re-applies the port on every boot, so the phone comes back reachable without interaction.",
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"Find the phone by MAC when the configured IP is wrong: the phone is on DHCP with no reservation, so a hardcoded address is a latent failure. A ping sweep populates the neighbour table and the MAC is looked up there.",
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"Match the exact ip:port when deciding whether a connection exists. The first version took the first `device` line, and since pairing also leaves an mDNS _adb-tls-connect._tcp entry for the same phone, it reported port 5555 as reachable while nmap showed it closed."
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],
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"verification": [
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{
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"command": "./enable_persistent_adb.sh 192.168.1.64 40401",
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"result": "pass",
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"evidence": "Installed the boot script (-rwxr-xr-x root root 373) and switched the port; nmap -p 5555 then showed '5555/tcp open' where it had shown 'closed' immediately before."
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},
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{
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"command": "./enable_persistent_adb.sh 192.168.1.99 # deliberately wrong IP",
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"result": "pass",
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"evidence": "'phone moved: 192.168.1.99 -> 192.168.1.64' then 'reachable on 5555 at the new address'. MAC discovery works."
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},
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{
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"command": "adb reboot; ./enable_persistent_adb.sh # no arguments, no interaction",
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"result": "pass",
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"evidence": "'already reachable on 5555 - nothing to do'. /proc/uptime was 149s so the reboot was real, and getprop service.adb.tcp.port returned 5555, proving the boot script ran rather than a stale adbd surviving."
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},
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{
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"command": "shellcheck enable_persistent_adb.sh",
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"result": "pass",
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"evidence": "No findings."
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},
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{
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"command": "Observed port drift during one session",
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"result": "pass",
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"evidence": "Wireless debugging offered 35545, then 40401, then 43781, and the listener vanished entirely twice when the screen slept. This is the failure mode the fixed port removes."
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}
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],
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"risks": [
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"adbd on a fixed port is reachable to anything on the LAN. It still requires an authorised key and an unknown key prompts on-device, but this is a wider surface than ephemeral Wireless debugging. Accepted explicitly by the user.",
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"PHONE_MAC is hardcoded to this handset; a new phone needs that constant updated. The script would otherwise silently fail to rediscover a moved device.",
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"Credential-encrypted storage means a freshly rebooted, still-locked phone accepts adb but cannot screencap or read app data until it is unlocked once - relevant when scripting post-reboot verification."
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],
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"rollback": [
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"rm /data/adb/service.d/99-adb-tcp-5555.sh and reboot, or setprop service.adb.tcp.port -1 followed by stop/start adbd to drop back to USB-only.",
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"Confirm with nmap -p 5555 that the port is closed afterwards, and that Wireless debugging still works as the bootstrap path."
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]
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}
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