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check valid ipv4
This commit is contained in:
Marco Ochse
GitHub
parent
e5e8ad4785
commit
65c7d9cc88
1 changed files with 73 additions and 58 deletions
131
bin/myip.sh
131
bin/myip.sh
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@ -6,83 +6,98 @@ timeout=2 # seconds to wait for a reply before trying next server
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verbose=1 # prints which server was used to STDERR
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dnslist=(
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"dig +short myip.opendns.com @resolver1.opendns.com"
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"dig +short myip.opendns.com @resolver2.opendns.com"
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"dig +short myip.opendns.com @resolver3.opendns.com"
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"dig +short myip.opendns.com @resolver4.opendns.com"
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"dig +short -4 -t a whoami.akamai.net @ns1-1.akamaitech.net"
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"dig +short whoami.akamai.net @ns1-1.akamaitech.net"
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"dig +short myip.opendns.com @resolver1.opendns.com"
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"dig +short myip.opendns.com @resolver2.opendns.com"
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"dig +short myip.opendns.com @resolver3.opendns.com"
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"dig +short myip.opendns.com @resolver4.opendns.com"
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"dig +short -4 -t a whoami.akamai.net @ns1-1.akamaitech.net"
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"dig +short whoami.akamai.net @ns1-1.akamaitech.net"
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)
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httplist=(
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alma.ch/myip.cgi
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api.infoip.io/ip
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api.ipify.org
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bot.whatismyipaddress.com
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canhazip.com
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checkip.amazonaws.com
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eth0.me
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icanhazip.com
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ident.me
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ipecho.net/plain
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ipinfo.io/ip
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ipof.in/txt
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ip.tyk.nu
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l2.io/ip
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smart-ip.net/myip
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wgetip.com
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whatismyip.akamai.com
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alma.ch/myip.cgi
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api.infoip.io/ip
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api.ipify.org
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bot.whatismyipaddress.com
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canhazip.com
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checkip.amazonaws.com
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eth0.me
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icanhazip.com
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ident.me
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ipecho.net/plain
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ipinfo.io/ip
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ipof.in/txt
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ip.tyk.nu
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l2.io/ip
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smart-ip.net/myip
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wgetip.com
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whatismyip.akamai.com
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)
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# function to check for valid ip
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function valid_ip()
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{
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local ip=$1
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local stat=1
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if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
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OIFS=$IFS
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IFS='.'
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ip=($ip)
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IFS=$OIFS
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[[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
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&& ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
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stat=$?
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fi
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return $stat
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}
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# function to shuffle the global array "array"
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shuffle() {
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local i tmp size max rand
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size=${#array[*]}
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max=$(( 32768 / size * size ))
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for ((i=size-1; i>0; i--)); do
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while (( (rand=$RANDOM) >= max )); do :; done
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rand=$(( rand % (i+1) ))
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tmp=${array[i]} array[i]=${array[rand]} array[rand]=$tmp
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done
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local i tmp size max rand
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size=${#array[*]}
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max=$(( 32768 / size * size ))
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for ((i=size-1; i>0; i--)); do
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while (( (rand=$RANDOM) >= max )); do :; done
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rand=$(( rand % (i+1) ))
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tmp=${array[i]} array[i]=${array[rand]} array[rand]=$tmp
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done
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}
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# if we have dig and a list of dns methods, try that first
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if hash dig 2>/dev/null && [ ${#dnslist[*]} -gt 0 ]; then
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eval array=( \"\${dnslist[@]}\" )
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shuffle
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for cmd in "${array[@]}"; do
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[ "$verbose" == 1 ] && echo Trying: $cmd 1>&2
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ip=$(timeout $timeout $cmd)
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if [ -n "$ip" ]; then
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echo $ip
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exit
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fi
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done
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eval array=( \"\${dnslist[@]}\" )
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shuffle
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for cmd in "${array[@]}"; do
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[ "$verbose" == 1 ] && echo Trying: $cmd 1>&2
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ip=$(timeout $timeout $cmd)
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if [ -n "$ip" ]; then
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if valid_ip $ip; then
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echo $ip
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exit
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fi
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fi
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done
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fi
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# if we haven't succeeded with DNS, try HTTP
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if [ ${#httplist[*]} == 0 ]; then
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echo "No hosts in httplist array!" >&2
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exit 1
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echo "No hosts in httplist array!" >&2
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exit 1
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fi
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# use curl or wget, depending on which one we find
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curl_or_wget=$(if hash curl 2>/dev/null; then echo curl; elif hash wget 2>/dev/null; then echo "wget -qO-"; fi);
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curl_or_wget=$(if hash curl 2>/dev/null; then echo "curl -s"; elif hash wget 2>/dev/null; then echo "wget -qO-"; fi);
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if [ -z "$curl_or_wget" ]; then
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echo "Neither curl nor wget found. Cannot use http method." >&2
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exit 1
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echo "Neither curl nor wget found. Cannot use http method." >&2
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exit 1
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fi
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eval array=( \"\${httplist[@]}\" )
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shuffle
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for url in "${array[@]}"; do
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[ "$verbose" == 1 ] && echo Trying: $curl_or_wget -s "$url" 1>&2
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ip=$(timeout $timeout $curl_or_wget -s "$url")
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if [ -n "$ip" ]; then
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echo $ip
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exit
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[ "$verbose" == 1 ] && echo Trying: $curl_or_wget "$url" 1>&2
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ip=$(timeout $timeout $curl_or_wget "$url")
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if [ -n "$ip" ]; then
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if valid_ip $ip; then
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echo $ip
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exit
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fi
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fi
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done
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