56 lines
1.8 KiB
Bash
Executable File
56 lines
1.8 KiB
Bash
Executable File
#!/bin/bash
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source "$(dirname "$0")/variables.conf"
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KEY="$(dirname "$0")/dns.key"
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TTL=604800
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FQDN=$(hostname)
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MYIP=$(ip route get 8.8.8.8 | grep -oP 'src \K[^ ]+')
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MYNUMBER=$(echo $MYIP | cut -d '.' -f 4) # last byte of IP
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#MYIP=$(dig +short myip.opendns.com @resolver1.opendns.com)
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# if $MYIP is not a valid IP, exit
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if [[ ! "$MYIP" =~ ^([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$ ]]; then
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echo "Invalid IP, aborting"
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exit 1
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fi
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# fetch current record with dig, and choose what to do
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# TODO we should probably improve this choice: current implementation prevents hosts that do not have a record yet to register themselves; We'd need to differentiate cases:
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# * correct ip, not the same -> OK, need to update
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# * correct ip, the same -> OK, nothing to do
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# * no result, name server was reachable -> OK, need to register
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# * no result, name server was not reachable -> NOK, abort
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# * result which is not a correct ip -> NOK, abort
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current_ip_record=$(dig $FQDN +short)
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if [[ "$current_ip_record" =~ ^([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$ ]]; then
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if [[ ! "$MYIP" = "$current_ip_record" ]]; then
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echo "Updating record"
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else
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echo "Record is already up to date, exiting."
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exit 0
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fi
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else
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echo "Server unreachable or no record for $FQDN, exiting."
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exit 0
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fi
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nsupdate -k $KEY -v << EOF
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server $NS
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zone $MAINZONE
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update delete $FQDN. A
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update add $FQDN. $TTL A $MYIP
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send
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EOF
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nsupdate -k $KEY -v << EOF
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server $NS
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zone $REVERSEZONE
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update delete $MYNUMBER.$REVERSEZONE PTR
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update add $MYNUMBER.$REVERSEZONE $TTL PTR $FQDN.
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send
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EOF
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exit 0
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