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Option to update with the lan ip #1

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merged 2 commits into from May 19, 2016
Merged

Option to update with the lan ip #1

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b0f247a
Added the possibility to use the local ip instead of WAN when updatin…
raduab May 18, 2016
01a69c1
small bug fixes
raduab May 18, 2016
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47 changes: 42 additions & 5 deletions cf-ddns.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,8 @@ Options
-f, --force Force a DNS update, even if WAN IP hasn't changed
-t, --test Test action without updating DNS record
-w=, --wan= Manually specify WAN IP address, skip detection
--get-wan-ip Determine the WAN IP, print it, and exit
--use-lan-ip Use LAN IP instead of WAN, when updating
--get-wan-ip Determine the WAN IP, print it and exit
--get-zone-id Print zone ID corresponding to zone name and exit
--get-record-id Print record ID corresponding to record name and exit
-h, --help Print this message and exit
Expand All @@ -44,6 +45,8 @@ record_name=''
# DNS record ID - if blank, will be looked up using record_name
record_id=''

use_lan_ip=false

###############
#The defaults below should be fine.
# Command to run for curl requests. If using alternate version, specify path.
Expand Down Expand Up @@ -77,6 +80,25 @@ validate_ip_addr () {
}


lookup_LAN_addr () {
local LAN_lookup

LAN_lookup=`ip addr | grep 'inet ' | grep -v '127.0.0.1' | awk 'NR==1{print $2}' | awk -F'/' '{print $1}'`

if [ ! $LAN_lookup ]; then
echo "Couldn't determine LAN IP. Please specify as an argument."
return 1
fi

if validate_ip_addr $LAN_lookup; then
echo "${LAN_lookup}"
return 0
fi

return 1
}


lookup_WAN_addr () {
local WAN_lookup

Expand Down Expand Up @@ -126,7 +148,12 @@ set_WAN_addr () {
exit 1
fi
else
set_WAN_addr `lookup_WAN_addr`
if $use_lan_ip; then
set_WAN_addr `lookup_LAN_addr`
else
set_WAN_addr `lookup_WAN_addr`
fi

return 0
fi
return 1
Expand Down Expand Up @@ -267,6 +294,13 @@ do_record_update () {
storage_dir=${storage_dir%%+(/)}
cf_api_url=${cf_api_url%%+(/)}

# Show help and exit if no option was passed in the command line

if [ -z "${1}" ]; then
echo "${helptext}"
exit 0
fi

# Get options and arguments from the command line
for key in "$@"; do
case $key in
Expand Down Expand Up @@ -306,6 +340,10 @@ for key in "$@"; do
run_mode="test"
shift
;;
--use-lan-ip)
use_lan_ip=true
shift
;;
--get-wan-ip)
run_mode="get-wan-ip"
shift
Expand Down Expand Up @@ -347,8 +385,7 @@ case $run_mode in
;;
get-record-id)
get_record_id #TBD - refactor
echo "Record ID for ${zone_name}:"
echo "${record_id}"
echo "Record ID for ${zone_name}: ${record_id}"
exit 0
;;
esac
Expand Down Expand Up @@ -376,7 +413,7 @@ if [ -n $prev_addr ] && [ "${prev_addr}" = "${WAN_addr}" ] && [ $force = false ]
exit 0
fi

if [ $run_mode = "test" ]; then
if [ "$run_mode" = "test" ]; then
echo "TEST: In zone ${zone_name}[${zone_id}],"
echo " update A record ${record_name}[${record_id}]"
echo " to point to ${WAN_addr}"
Expand Down