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drbrain9k
n00b
Joined: 05 Jun 2006
Posts: 1
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 Posted: Mon Jun 05, 2006 1:17 am Post subject: Freedns init script |
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I just finished writing a freedns dynamic ip init script and figured I would share it. I would really love coding style comments, as it's my first script.
The idea is that my IPs only really change when I physically move my box. So I only need to check and update at boot time. If you want to check all the time, there are plenty of good cron scripts at http://freedns.afraid.org/scripts/freedns.clients.php that will suit.
The only thing you need to change is $UPDATE_URL in the /etc/conf.d/freedns file, and then use a simple rc-update to install it.
Here is the /etc/init.d/freedns file:
| Code: | #!/sbin/runscript
# Copyright 2006 Jeffrey Nichols
depend() {
need net
use dns logger
}
checkconfig() {
if [ -z "${CHECK_CMD}" ] ; then
eerror "Please edit /etc/conf.d/freedns"
eerror "I need to know how to check for IP!"
return 1
fi
if [ -z "${OLDIP_FILE}" ] ; then
eerror "Please edit /etc/conf.d/freedns"
eerror "I need to know where to store the IP file!"
return 1
fi
if [ -z "${UPDATE_COMMAND}" ] ; then
eerror "Please edit /etc/conf.d/freedns"
eerror "I need to know how to update the IP!"
return 1
fi
return 0
}
start() {
checkconfig || return $?
ebegin "Getting current IP"
CURRENTIP=`${CHECK_CMD}`
echo "Found ${CURRENTIP}"
if [ ! -e "${OLDIP_FILE}" ] ; then
echo "Creating ${OLDIP_FILE}"
echo "0.0.0.0" > "${OLDIP_FILE}"
fi
OLDIP=`cat ${OLDIP_FILE}`
eend $? "Error reading old ip"
if [ "${CURRENTIP}" != "${OLDIP}" ] ; then
ebegin "Issuing update command"
${UPDATE_COMMAND}
eend $? "Update failed"
fi
ebegin "Saving IP"
echo "${CURRENTIP}" > "${OLDIP_FILE}"
eend $? "Save failed"
}
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and here is the /etc/conf.d/freedns file:
| Code: | # /etc/conf.d/freedns
# Command to find the current IP on the system.
CHECK_CMD="/usr/bin/curl -s http://ip.dnsexit.com/ | sed -e 's/ //'"
# Where to store the file containing the old IP
# for comparison on the next run.
OLDIP_FILE="/var/lib/misc/oldip"
# The command to run when the IP is different.
UPDATE_URL="http://freedns.afraid.org/dynamic/update.php?" <--edit this line to the url from http://freedns.afraid.org/dynamic/index.php
UPDATE_COMMAND="/usr/bin/curl -s $UPDATE_URL" |
Credit: I used the dynIP.sh file from http://freedns.afraid.org/forums/viewtopic.php?p=4161 for the idea and the ntp-client init files as a very loose template. |
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disi
Veteran
Joined: 28 Nov 2003
Posts: 1354
Location: Out There ...
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| Posted: Wed Feb 11, 2009 3:04 pm Post subject: |
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That is what I use as a cron job on my system (copied a lot of yours  )
| Code: | #! /bin/bash
# this script updates the dynamic ip on http://freedns.afraid.org/ using curl
# check http://freedns.afraid.org/api/ and as weapon ASCII for the phrase in UPDATE_URL
OLDIP_FILE="/var/lib/misc/oldip"
CHECK_CMD="/usr/bin/curl -s http://ip.dnsexit.com/ | sed -e 's/ //'"
UPDATE_URL="http://freedns.afraid.org/dynamic/update.php?<blablubbblablablablubbphrasesumber>"
UPDATE_COMMAND="/usr/bin/curl -s $UPDATE_URL"
echo "Getting current IP"
CURRENTIP=`${CHECK_CMD}`
echo "Found ${CURRENTIP}"
if [ ! -e "${OLDIP_FILE}" ] ; then
echo "Creating ${OLDIP_FILE}"
echo "0.0.0.0" > "${OLDIP_FILE}"
fi
OLDIP=`cat ${OLDIP_FILE}`
if [ "${CURRENTIP}" != "${OLDIP}" ] ; then
echo "Issuing update command"
${UPDATE_COMMAND}
fi
echo "Saving IP"
echo "${CURRENTIP}" > "${OLDIP_FILE}" |
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