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2
TELNETD.md
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@ -17,7 +17,7 @@ chmod 555 /tmp/bin/busybox;
/tmp/bin/busybox telnetd -l/bin/ash;
```
> **Note:**
> Don't forget to add a ";" at the end inside the quotes. Replace all spaces with "+" if you want to create your own URL with curl.
> Don't forget to add a ";" at the end inside the quotes. Replace all spaces with "+" if you want to create your own URL with curl. The length of the message is limited, so don't try to add too much code.
The tool **_"busybox"_** is like a swiss army knife and combines a lot of CLI commands in a single binary file. That file was stripped down in the version that was running on my Linplay device and does not include a telnetd anymore. Therefore you have to get a full version from somewhere.

109
persistant-hook.md
View file

@ -36,12 +36,70 @@ mtd8: 00080000 00010000 "user"
mtd9: 00200000 00010000 "user2"
#
```
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.
The mtd8 device named "user" is not erased at a reboot, because it may contain a preset list (file ***totalqueue.xml*** and/or ***keymap.xml***) in /mnt directory. There's also a third file in the directory called ***radio.xml***.
The mtd9 device named "user2" is not erased at a reboot, because it may contain additional 'vendor' data. 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.
After a reset to factory settings with release v4.6.415145, release date 2022/04/27, the device has a web interface. To run this web interface the device calls a shell script ***/vendor/user/user.sh where some code can be added to:
```
/usr/sbin/telnetd
cd /system/workdir/
. ./evn.sh
chmod 777 /vendor/user/daemonize
chmod 777 /vendor/user/ws_server
/vendor/user/daemonize /vendor/user/ws_server
```
> **Note:**
> The ***telnetd*** is NOT installed, because the file is missing in the (read only) directory /usr/bin.
Just append the code below at the end of that file. On the device where the script was not present, I've just created it.
```
sleep 5
# get telnetd from full version of busybox and start in background
mkdir /tmp/bin
wget -O /tmp/bin/busybox -T 5 http://10.1.1.22/linkplay/a31/bin/busybox -q
chmod 555 /tmp/bin/busybox
ln -s /tmp/bin/busybox /tmp/bin/telnetd
ln -s /tmp/bin/busybox /tmp/bin/ash
/tmp/bin/telnetd telnetd -l/tmp/bin/ash &
echo '#!/bin/sh' >/tmp/bin/help
echo '/tmp/bin/busybox --help' >>/tmp/bin/help
chmod 755 /tmp/bin/help
# shut down WiFi after 5 min, but only if the device is connected by LAN (eth2) and got an IP addr on that interface
sleep 300
lanIPup=`ifconfig eth2 | grep 'inet addr:' | wc -l`
if [ $lanIPup -eq 1 ]; then
ifconfig ra0 down
ifconfig apcli0 down
ifconfig apcli0 down
fi
unset lanIPup
# Uncomment to disable sleep after 15 minutes (I haven't used this code - just an example from Crymeiriver)
#while true; do sleep 60; echo 'AXX+MUT+000' >/dev/ttyS0; done &
```
The shutdown of the 'apcli0' WiFi interface does not work within the script when called in the first place, however it works a bit later if executed manually. So I added the 300 seconds (5 minutes) sleep and executed the command twice. Now it looks that it works as expected. I also added some code, so that the WiFi interface is NOT shut down if the Ethernet / LAN interface (eth2) does not get an IP address.
Compared to the the section [Enable telnetd](/TELNETD.md), the code above has 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)***.
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 the commands you need (recommended, see below for an example) or start them directly, e.g. ***/tmp/bin/busybox dmesg***.
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.
> **IMPORTANT:**
> 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.
> **Note:**
> 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.
> Neither the directory ***/vendor/user*** nor the **user.sh** script were installed on my Up2Stream devices when I bought them with version 4.2. That may have changed with v4.6
Here's the file from the device where the script was already present (used to start a daemon called ***socket***):
Here's an older script that I found on the device (used to start a daemon called ***socket***):
```
# cat user.sh
#!/bin/sh
@ -58,49 +116,6 @@ if [ $sn -eq 0 ]; then
/vendor/user/socket &
fi
```
Just append the code below at the end of that file. On the device where the script was not present, I've just created it.
Compared to the the section [Enable telnetd](/TELNETD.md), the code below has 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)***.
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 the commands you need (recommended, see below for an example) or start them directly, e.g. ***/tmp/bin/busybox dmesg***.
```
mkdir /vendor/user
cat <<\EOF >> /vendor/user/user.sh
#!/bin/sh
sleep 5
# get telnetd from full version of busybox and start in background
mkdir /tmp/bin
wget -O /tmp/bin/busybox -T 5 http://10.1.1.22/linkplay/a31/bin/busybox -q
chmod 555 /tmp/bin/busybox
ln -s /tmp/bin/busybox /tmp/bin/telnetd
ln -s /tmp/bin/busybox /tmp/bin/ash
/tmp/bin/telnetd telnetd -l/tmp/bin/ash &
echo '#!/bin/sh' >/tmp/bin/help
echo '/tmp/bin/busybox --help' >>/tmp/bin/help
chmod 755 /tmp/bin/help
# shut down WiFi - use only if the device is connected by LAN - eth0
ifconfig apcli0 down
ifconfig ra0 down
sleep 600
ifconfig apcli0 down
ifconfig apcli0 down
# Uncomment to disable sleep after 15 minutes
#while true; do sleep 60; echo 'AXX+MUT+000' >/dev/ttyS0; done &
EOF
chmod 755 /vendor/user/user.sh
cd /vendor/user
ls -l
```
The shutdown of the 'apcli0' WiFi interface does not work within the script when called in the first place, however it works a bit later if executed manually. So I added the 600 seconds (10 minutes) sleep and executed the command twice. Now it looks that it works as expected.
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.
> **IMPORTANT:**
> 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.
For testing purpose, you may ***reboot*** and ***telnet*** to the device afterwards.
@ -133,5 +148,5 @@ BusyBox v1.23.2 (2016-09-27 07:54:34 CEST) built-in shell (ash)
/system/workdir # exit
Connection closed by foreign host.
```
```