check valid ipv4

bin/myip.sh

@@ -34,6 +34,24 @@ httplist=(
   whatismyip.akamai.com
 )
 
+# function to check for valid ip
+function valid_ip()
+{
+  local  ip=$1
+  local  stat=1
+
+  if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
+    OIFS=$IFS
+    IFS='.'
+    ip=($ip)
+    IFS=$OIFS
+    [[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
+        && ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
+    stat=$?
+  fi
+  return $stat
+}
+
 # function to shuffle the global array "array"
 shuffle() {
   local i tmp size max rand
@@ -45,44 +63,41 @@ shuffle() {
     tmp=${array[i]} array[i]=${array[rand]} array[rand]=$tmp
   done
 }
-
 # if we have dig and a list of dns methods, try that first
 if hash dig 2>/dev/null && [ ${#dnslist[*]} -gt 0 ]; then
   eval array=( \"\${dnslist[@]}\" )
   shuffle
-
   for cmd in "${array[@]}"; do
     [ "$verbose" == 1 ] && echo Trying: $cmd 1>&2
     ip=$(timeout $timeout $cmd)
     if [ -n "$ip" ]; then
+      if valid_ip $ip; then
         echo $ip 
         exit
       fi
+    fi
   done
 fi
-
 # if we haven't succeeded with DNS, try HTTP
 if [ ${#httplist[*]} == 0 ]; then
   echo "No hosts in httplist array!" >&2
   exit 1
 fi
-
 # use curl or wget, depending on which one we find
-curl_or_wget=$(if hash curl 2>/dev/null; then echo curl; elif hash wget 2>/dev/null; then echo "wget -qO-"; fi);
+curl_or_wget=$(if hash curl 2>/dev/null; then echo "curl -s"; elif hash wget 2>/dev/null; then echo "wget -qO-"; fi);
-
 if [ -z "$curl_or_wget" ]; then
   echo "Neither curl nor wget found. Cannot use http method." >&2
   exit 1
 fi
-
 eval array=( \"\${httplist[@]}\" )
 shuffle
-
 for url in "${array[@]}"; do
-    [ "$verbose" == 1 ] && echo Trying: $curl_or_wget -s "$url" 1>&2
+  [ "$verbose" == 1 ] && echo Trying: $curl_or_wget "$url" 1>&2
-    ip=$(timeout $timeout $curl_or_wget -s "$url")
+  ip=$(timeout $timeout $curl_or_wget "$url")
   if [ -n "$ip" ]; then
+    if valid_ip $ip; then 
       echo $ip 
       exit
     fi
+  fi
 done