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160 lines
6.3 KiB
Markdown
160 lines
6.3 KiB
Markdown
# Install Persistant Hook
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When the device reboots, any changes in ramfs are lost, but the device is using flash with squashfs and jffs2 file systems. I have not discovered how to modfiy and upload an image to squashfs, but with jffs2 there is a way to install a hook. That hook even survives an upgrade that is done afterwards (see end of this section)!
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To start, you have to enable telnet and that may require a downgrade in the first step. See [Downgrade Firmware](/Downgrade.md) and [Enable telnetd](/TELNETD.md).
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Below is an output of mount command and ***cat /proc/mtd*** output:
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```
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# mount
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rootfs on / type rootfs (rw)
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/dev/root on / type squashfs (ro,relatime)
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proc on /proc type proc (rw,relatime)
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none on /var type ramfs (rw,relatime)
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none on /etc type ramfs (rw,relatime)
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none on /tmp type ramfs (rw,relatime)
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none on /media type ramfs (rw,relatime)
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none on /sys type sysfs (rw,relatime)
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none on /dev/pts type devpts (rw,relatime,mode=600)
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mdev on /dev type ramfs (rw,relatime)
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devpts on /dev/pts type devpts (rw,relatime,mode=600)
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mdev on /dev type ramfs (rw,relatime)
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devpts on /dev/pts type devpts (rw,relatime,mode=600)
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/dev/mtdblock8 on /mnt type jffs2 (rw,relatime)
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/dev/mtdblock9 on /vendor type jffs2 (rw,relatime)
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# cat /proc/mtd
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dev: size erasesize name
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mtd0: 01000000 00010000 "ALL"
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mtd1: 00030000 00010000 "Bootloader"
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mtd2: 00010000 00010000 "Config"
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mtd3: 00010000 00010000 "Factory"
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mtd4: 00200000 00010000 "bkKernel"
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mtd5: 001df508 00010000 "Kernel"
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mtd6: 00950af8 00010000 "RootFS"
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mtd7: 00b30000 00010000 "Kernel_RootFS"
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mtd8: 00080000 00010000 "user"
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mtd9: 00200000 00010000 "user2"
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#
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```
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The mtd9 device named "user2" is not erased at a reboot, because it contains play lists. It is mounted as /vendor and a hook can be installed in ***/vendor/user*** directory as described below. On the Up2Stream Pro device that I own that directory was already present and a script called ***user.sh*** was located in that directory.
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> **Note:**
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> Neither that directory nor the **user.sh** script were installed on my Up2Stream Amp device by default. Both devices have the same software version 4.2.8020 from 2020/02/20 (20th of Feb 2020) and were downgraded from v4.6.415145, release date 2022/04/27.
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Here's the file from the device where the script was already present (used to start a daemon called ***socket***):
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```
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# cat user.sh
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#!/bin/sh
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echo "runing custom's app socket.............."
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sleep 5
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chmod 777 /vendor/user/socket
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sn=`ps -ef | grep /vendor/user/socket | grep -v grep |wc -l`
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echo $sn
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if [ $sn -eq 0 ]; then
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/vendor/user/socket &
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fi
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# ######### additional code to install telnetd and more #############
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# get telnetd from full version of busybox and start in background
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mkdir /tmp/bin
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wget -O /tmp/bin/busybox -T 5 http://10.1.1.22/linkplay/a31/bin/busybox -q
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chmod 555 /tmp/bin/busybox
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ln -s /tmp/bin/busybox /tmp/bin/telnetd
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sn=`ps | grep busybox | wc -l`
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if [ $sn -eq 1 ]; then
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killall busybox
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fi
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sn=`ps | grep telnetd | wc -l`
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if [ $sn -eq 1 ]; then
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killall telnetd
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fi
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/tmp/bin/telnetd telnetd -l/bin/ash &
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# shut down WiFi
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ifconfig apcli0 down
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ifconfig ra0 down
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sleep 60
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ifconfig apcli0 down
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echo "WiFi disabled!"
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# Uncomment to disable sleep after 15 minutes
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#while true; do sleep 60; echo 'AXX+MUT+000' >/dev/ttyS0; done &
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```
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For testing purpose, you may ***reboot*** and ***telnet*** to the device afterwards.
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Here's the file from the device where the script was NOT present. There is a little "enhancement" included, because the downloaded version of busybox is used as the shell ***/tmp/bin/ash*** instead of "build-in" version. You can see the difference, because the shell prompt message is ***BusyBox v1.23.2 (2016-09-27 07:54:34 CEST) built-in shell (ash)*** instead of ***BusyBox v1.12.1 () built-in shell (ash)***.
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A list of all commands that are included is shown with ***/tmp/bin/busybox --help*** or just help (see shell script below). You may create symbolic links for these commands (recommended, see below for an example) or start them directly, e.g. ***/tmp/bin/busybox dmesg***.
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```
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mkdir /vendor/user
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cat <<\EOF > /vendor/user/user.sh
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#!/bin/sh
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sleep 5
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# get telnetd from full version of busybox and start in background
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mkdir /tmp/bin
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wget -O /tmp/bin/busybox -T 5 http://10.1.1.22/linkplay/a31/bin/busybox -q
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chmod 555 /tmp/bin/busybox
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ln -s /tmp/bin/busybox /tmp/bin/telnetd
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ln -s /tmp/bin/busybox /tmp/bin/ash
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/tmp/bin/telnetd telnetd -l/tmp/bin/ash &
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echo '#!/bin/sh' >/tmp/bin/help
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echo '/tmp/bin/busybox --help' >>/tmp/bin/help
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chmod 755 /tmp/bin/help
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# shut down WiFi
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ifconfig apcli0 down
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ifconfig ra0 down
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sleep 600
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ifconfig apcli0 down
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# Uncomment to disable sleep after 15 minutes
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#while true; do sleep 60; echo 'AXX+MUT+000' >/dev/ttyS0; done &
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EOF
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chmod 755 /vendor/user/user.sh
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cd /vendor/user
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ls -l
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```
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The shutdown of "apcli0" does not work within the script, however it works a bit later if executed manually.
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So far, the device fetches the full version of busybook after each reboot, but stores that binary in ramfs. With ***df*** command you can verify the free space on each of the file systems.
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> **IMPORTANT:**
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> The hook is NOT called, if the device got stuck during an upgrade, e.g. if you have a ***products.xml*** file with a product ID that is matching your product that triggers an upgrade, but got stuck for some reasons. Therefore I recommend to rename the ***products.xml*** file on your server to something else and block or redirect any upgrade requests on the Internet. See [Downgrade Firmware](/Downgrade.md) section at the end for details.
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The good thing is, that this hook even suvives an upgrade that is done afterwards (tested with v4.6.415145, release date 2022/04/27.):
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```
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Mac-mini ~ % curl -s 'http://10.1.1.52/httpapi.asp?command=getStatusEx' | jq
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{
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"uuid": "FF31F09EAC1C213319CC79B5",
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"DeviceName": "Wohnzimmer",
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"GroupName": "Wohnzimmer",
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"ssid": "Wohnzimmer_4029",
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"language": "en_us",
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"firmware": "4.6.415145",
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"hardware": "A31",
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"build": "release",
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"project": "UP2STREAM_PRO_V3",
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"priv_prj": "UP2STREAM_PRO_V3",
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"project_build_name": "a31rakoit",
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"Release": "20220427",
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"temp_uuid": "B4D39CBCE2C2015F",
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...
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}
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Mac-mini ~ % telnet 10.1.1.52
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Trying 10.1.1.52...
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Connected to 10.1.1.52.
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Escape character is '^]'.
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BusyBox v1.23.2 (2016-09-27 07:54:34 CEST) built-in shell (ash)
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/system/workdir # exit
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Connection closed by foreign host.
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```
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