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56 lines
1.9 KiB
56 lines
1.9 KiB
#!/bin/sh
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#################################################################
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# Script to send the IP address of a host to you using a #
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# Telegram bot. This script also adds a cron job, so that the #
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# bot nofifies you with every boot. #
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# #
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# Author: Maximilian Stiefel #
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# Last modified: 26. April 2018 #
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# CLI usage: ./send_telegram_dynamic_ip bot chat #
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# Required PKGs: mail #
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# #
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#################################################################
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#################################################################
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# Vars #
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#################################################################
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HOST=$(hostname)
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FILE=`realpath $0`
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NU_PARAMS=2
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#################################################################
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# Action #
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#################################################################
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# Check if the expected number of parameters is given.
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if [ $# != $NU_PARAMS ]
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then
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echo "Error: Illegal number of parameters."
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exit 1;
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fi
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# Get bot token and chat id.
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BOT=$1
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CHAT_ID=$2
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URL="https://api.telegram.org/bot$BOT/sendMessage"
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ENTRY="@reboot $FILE $BOT $CHAT_ID"
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# Wait until we are online.
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while ! wget -q --spider http://google.com ; do true; done
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# Get private IP.
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CURRENT_IP=$(ip addr | grep 'state UP' -A2 | tail -n1 | awk '{print $2}' | cut -f1 -d'/')
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MESSAGE="Hej! Ha en trevlig dag. IP adressen av $HOST är $CURRENT_IP."
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# Instruct bot.
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curl -s -X POST $URL -d chat_id=$CHAT_ID -d text="$MESSAGE" > /dev/null
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echo "Message sent."
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# Grep returns zero if entry is found.
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if ! crontab -l | grep -q "$ENTRY" ; then
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crontab -l > cron
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echo "$ENTRY" >> cron
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crontab cron
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rm cron
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echo "Added $ENTRY"
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echo "to crontab."
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else
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echo "Crontab entry $ENTRY"
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echo "already exists."
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fi
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exit 0;
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