initial commit

dnsupdate.sh

@@ -0,0 +1,94 @@
+#!/bin/bash
+########################################################################
+#  Copyright (C) 2016 Max Mehl <mail [at] mehl [dot] mx>
+########################################################################
+#  
+#  This program is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+#  
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#  
+#  You should have received a copy of the GNU General Public License
+#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#  
+########################################################################
+#  
+#  Client part of the "Snap DynDNS Server", grabbing public IP address 
+#  and pushing it to the server handling the more complicated API stuff
+#  
+########################################################################
+
+
+cd "$(dirname "$(readlink -f "$0")")"
+
+# Test if config.cfg exists and set needed variables
+if [ ! -e config.cfg ]; then echo "Missing config.cfg file. Edit and rename config.cfg.sample"; exit 1; fi
+source config.cfg
+
+# Test whether necessary applications are installed
+function testinst {
+  APP=$1
+  if [ $(which $APP | wc -l) != 1 ]; then
+    echo "$APP does not seem to be installed. Aborting."
+    exit 1
+  fi
+}
+testinst curl
+testinst wget
+
+# Does the old.ip file exist? If not, fill it with unrealistic input
+if [ ! -e old.ip ]; then
+    echo "0.0.0.0" > old.ip
+fi
+
+# Read old IP, gather new IP via IP return service
+OLDIP=$(cat old.ip)
+NEWIP=$(wget -T $TIMEOUT -q -O - $IPSERV)
+
+# Post current timestamp in logfile
+echo "[$(date "+%Y-%m-%d %H:%M:%S")]" > update.log
+
+# check whether the IP has changed since the last update
+if [ "$OLDIP" == "$NEWIP" ]; then
+    echo "IP ($OLDIP) did not change. Aborting." >> update.log
+    exit 0
+fi
+
+# Check whether IP is on ignore list
+if [ $(echo "$IGNOREIP" | grep "$NEWIP") ]; then
+    echo "Current IP ($NEWIP) is ignored. Aborting without DNS update." >> update.log
+    exit 0
+fi
+
+# Check whether user is using a Tor exit node IP
+if [ "$CHECKTOR" = true ]; then
+  # Only download list of exit nodes if tor-ips.txt file isn't existing yet, or if it is older than 7 days
+  if [ ! -e tor-ips.txt ] || [ $[ $(date +%s) - $(stat -L -c %Y tor-ips.txt) ] -gt "604800" ]; then
+    # download list, extract plain IPs, move back to file
+    echo "download list"
+    wget -O tor-ips.txt $EXITNODES
+    TORIPS=$(grep "^ExitAddress" tor-ips.txt | cut -d" " -f2)
+    echo $TORIPS | sed 's/ /\n/g' > tor-ips.txt
+  fi
+  # Grep current IP in list of exit node IPs
+  if [ $(grep "^$NEWIP$" tor-ips.txt) ]; then
+    echo "Current IP ($NEWIP) is ignored because it is a Tor exit IP. Aborting without DNS update." >> update.log
+    exit 0
+  fi
+fi
+
+# Run update if old IP and current IP are not equal
+if [ ! "$OLDIP" == "$NEWIP" ]; then
+    echo $NEWIP > old.ip
+    
+    curl -X POST -d "domain=$DOMAIN&user=$USER&pass=$PASS&ip=$NEWIP" "$SERVER" >> update.log
+    
+    echo "" >> update.log
+    echo "Updated IP address from $OLDIP to $NEWIP." >> update.log
+fi
+