60 lines
2.6 KiB
Bash
Executable File
60 lines
2.6 KiB
Bash
Executable File
#!/bin/bash
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########################################################################
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# Author: Fred (support@qo-op.com) + @benoit
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# Version: 0.4
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# License: AGPL-3.0 (https://choosealicense.com/licenses/agpl-3.0/)
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########################################################################
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{ # Full reading before execution !
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# echo '
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#
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# __ ___ _ ___
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# / |/ /_ __ ____ ____ _____ ___ ___ (_)___/__ \
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# / /|_/ / / / / / __ \/ __ `/ __ `__ \/ _ \ / / ___// _/
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# / / / / /_/ / / / / / /_/ / / / / / / __/ / (__ )/_/
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# /_/ /_/\__, / /_/ /_/\__,_/_/ /_/ /_/\___/ /_/____/(_)
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# /____/
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#
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# ' | lolcat
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MY_PATH="`dirname \"$0\"`" # relative
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MY_PATH="`( cd \"$MY_PATH\" && pwd )`" # absolutized and normalized
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ME="${0##*/}"
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# check if -w is specified:
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# Will look for the public IP of my gateway
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# if my node is a Demilitarized Zone (DMZ)
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WAN=$1
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# GNU DEBIAN Core install extension
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[[ ! $(which nslookup) ]] && sudo apt-get update && sudo apt-get install dnsutils -y
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# What is myIP?
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export myIP=$(hostname -I | awk '{print $1}' | head -n 1)
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# Check if IP is from reserved LAN addresses
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export isLAN=$(echo $myIP | grep -E "/(^127\.)|(^192\.168\.)|(^10\.)|(^172\.1[6-9]\.)|(^172\.2[0-9]\.)|(^172\.3[0-1]\.)|(^::1$)|(^[fF][cCdD])/")
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# Find default route gateway
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export myRouter=$(sudo route -n | grep ' UG ' | tail -n 1 | awk '{print $2}')
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# Ask to the router my name (BOX DNS or system defined)
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[[ $isLAN ]] && export NODENAME=$(sudo nslookup $myIP $myRouter -timeout=2 | grep 'name =' | awk -F ' = ' '{print $2}' | sed 's/\.$//') \
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|| export NODENAME=$(sudo nslookup $myIP -timeout=2 | grep 'name =' | awk -F ' = ' '{print $2}' | sed 's/\.$//')
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if [[ -z "$NODENAME" && "$WAN" == "-w" ]]; then
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IP=`wget --quiet http://brouits.free.fr/ip.php -O- | sed 's/\r//'`
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NODENAME=`nslookup $IP -timeout=2 | head -1 | cut -d'=' -f 2 | sed -E 's/^ *(.*)\.$/\1/'`
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fi
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# We must have that nodename, perhaps BOX DNS doesn't exist...
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[[ $NODENAME == "" ]] && [[ $isLAN ]] && export NODENAME=$(sudo nslookup $myIP -timeout=2 | grep 'name =' | awk -F ' = ' '{print $2}' | sed 's/\.$//')
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# OK no DNS is answering, let's be /etc/hostname
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[[ $NODENAME == "" ]] && NODENAME=$(cat /etc/hostname)
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NODENAME=$(echo "$NODENAME" | awk '{print tolower($1)}' | tail -n1)
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[[ ! $(ping $NODENAME -c 1 2>/dev/null) ]] && NODENAME=$(echo $NODENAME | awk -F '.' '{ print $1 }') && NODENAME=$(echo "$NODENAME.local")
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[[ ! $(ping $NODENAME -c 1 2>/dev/null) ]] && NODENAME="localhost"
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# I can tell my name is (in lowercase)
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echo "$NODENAME"
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} # Full reading before execution !
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