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--- linux:telegram [2015/07/01 19:51] – [Step 5: install the client] rlunaro
+++ linux:telegram [2022/12/02 21:02] (current) – external edit 127.0.0.1
@@ Line 54: / Line 54: @@
 ===== Step 4: a basic test =====
-Make a simple confirmation that the program is working. The program is called ''telegram-cli'' and it's under the ''bin'' directory. Go there, and execute:
+Make a simple confirmation that the program is working. You can skip this test because we will have to create another user --telegramd-- to run the service and we will have to do it again.
+The program is called ''telegram-cli'' and it's under the ''bin'' directory. Go there, and execute:
 <code>
@@ Line 63: / Line 65: @@
 <code>
-rluna@gamora:~/tg-1.0.5.1/bin$ ./telegram-cli ../tg-server.pub -k ../tg-server.pub
+$:~/tg-1.0.5.1/bin$ ./telegram-cli ../tg-server.pub -k ../tg-server.pub
 Telegram-cli version 1.0.5, Copyright (C) 2013-2014 Vitaly Valtman
 Telegram-cli comes with ABSOLUTELY NO WARRANTY; for details type `show_license'.
@@ Line 85: / Line 87: @@
 ===== Step 5: install the client =====
-I've opted for manually install the client. I've copied the ''telegram-cli'' program under ''/usr/local/bin'' and the public key of the server under /etc, with very restricted permissions for reading.
+I've opted for manually install the client. I've copied the ''telegram-cli'' program under ''/usr/local/share/telegram'' and the public key of the server under /etc, with very restricted permissions for reading.
 <code>
-sudo cp telegram-cli /usr/local/bin
+# mkdir /usr/local/share/telegram
-sudo cp tg-server.pub /etc
+# cp telegram-cli /usr/local/share/telegram
-sudo chmod g=r,o=r,u=r /etc/tg-server.pub
 </code>
+I've also created a directory called ''/etc/telegram'' that will hold all the configuration and the public key:
+</code>
+# mkdir /etc/telegram
+# chmod u=rwx,g=rx,o=rx /etc/telegram
+# cp tg-server.pub /etc/telegram
+# chmod g=r,o=r,u=r /etc/telegram/tg-server.pub
+</code>
+===== Step 6: create the system user telegramd =====
+In order to run the telegram-daemon as root, you will need to create the user telegramd. I've opted
+to create this user as a system user:
+<code>
+# useradd -M --user-group --system --shell=/bin/false telegramd
+</code>
+Impersonate this user and run the telegram-cli program again, to create a proper configuration file:
+<code>
+telegramd@:~$ /usr/local/share/telegram/telegram-cli -k /etc/telegram/tg-server.pub
+Telegram-cli version 1.0.5, Copyright (C) 2013-2014 Vitaly Valtman
+Telegram-cli comes with ABSOLUTELY NO WARRANTY; for details type `show_license'.
+This is free software, and you are welcome to redistribute it
+under certain conditions; type `show_license' for details.
+Telephone number (with '+' sign):
+</code>
+===== Step 7: create a daemon and install it =====
+Telegram-cli has a bug that provokes that, unless ''contact_list'' is the first command issued, no message can be sent through the program. Moreover, there is no way to create a program that just sends a message and ends: the program waits forever even if you run through a pipe. __A more simple version to make automatic notifications from a machine would be desirable.__
+Let's go for it. The code for the daemon is this (customize the adequate variables):
+<code>
+#!/bin/bash
+#
+# telegram.sh  - to start / stop a telegram server
+#
+#
+### BEGIN INIT INFO
+# Provides:		telegram
+# Required-Start:	$local_fs $network $syslog
+# Required-Stop:	$local_fs $network $syslog
+# Default-Start:	2 3 4 5
+# Default-Stop:		0 1 6
+# Short-Description:	Telegram server
+### END INIT INFO
+TELEGRAM_BIN="/usr/local/share/telegram/telegram-cli"
+TELEGRAM_PORT=1234
+TELEGRAM_ARGS="-p /home/telegramd/.telegram-cli -k /etc/telegram/tg-server.pub -d -P $TELEGRAM_PORT"
+PID_FILE=/var/run/telegram.pidfile
+umask 022
+test -f "$TELEGRAM_BIN" || exit 0
+case $1 in
+start)
+    echo "Starting telegram server"
+    $TELEGRAM_BIN $TELEGRAM_ARGS &
+    echo $! > "$PID_FILE"
+    # issue the command "contact_list" because it's needed
+    # for sending messages
+    sleep 5
+    echo "contact_list" | nc 127.0.0.1 $TELEGRAM_PORT
+    echo "done"
+    ;;
+stop)
+    echo "Stopping telegram server"
+    # first make a gentle kill
+    kill $(cat "$PID_FILE")
+    # then sleep and make a hard kill
+    sleep 4s
+    kill -9 $(cat "$PID_FILE") 2> /dev/null
+    rm "$PID_FILE"
+    echo "done"
+    ;;
+reload)
+    $0 stop
+    $0 start
+    ;;
+status)
+    if kill -0 $(cat "$PID_FILE") ; then
+    	echo "Telegram process is running"
+    else
+    	echo "Telegram process has stopped"
+    fi
+    ;;
+*)
+    echo "Usage: $0 start | stop | reload | status"
+    ;;
+esac
+exit 0
+</code>
+Install it under ''/etc/init.d'' (in ubuntu):
+<code>
+sudo mv telegram-daemon /etc/init.d
+sudo chown root:root /etc/init.d/telegram-daemon
+</code>
+===== Step 8: install the telegram-msg program =====
+After that I've created a ''telegram-msg'' program to just send a message through telegram. The program is pretty simple:
+<code>
+#!/bin/bash
+#
+# telegram-msg - sends a telegram message
+#
+#
+echo "msg $1 $2" | nc 127.0.0.1 1234
+</code>
+===== Step 8: first test =====
+<code>
+$ sudo /etc/init.d/telegram-daemon start
+$ telegram-msg somebody "some message you want to send"
+</code>