#!/bin/bash

get_fg_ip_pub(){		#v adapté 11/12/2017
	local dig_test ip_test

	list_ip4(){		# testé 12/2017

		ip_test=(	# pas de https
			http://whatismyip.akamai.com
			http://eth0.me
			ipinfo.io/ip					# http & https
			http://alma.ch/myip.cgi			# peu fiable curl
			http://checkip.amazonaws.com	# peu fiable wget
			api.infoip.io/ip				# http & https fiable wget
			api.ipify.org					# http & https fiable wget
			http://ipecho.net/plain			# peu fiable wget / curl
		#	http://ipof.in/txt				# fail wget
		)
	}

	list_ip4_dig(){		# testé 12/2017
		dig_test=(
			whoami.akamai.net/@ns1-1.akamaitech.net
			myip.opendns.com/@resolver1.opendns.com
			myip.opendns.com/@resolver2.opendns.com
			myip.opendns.com/@resolver3.opendns.com
			myip.opendns.com/@resolver4.opendns.com
		)
	}

	list_ip6(){		# testé 12/2017
		ip_test=(
			http://ipv6.whatismyip.akamai.com
			ip.tyk.nu							# http & https
			wgetip.com							# http & https
			l2.io/ip							# http & https peu fiable wget
			icanhazip.com						# http & https peu fiable wget
			http://bot.whatismyipaddress.com	# peu fiable wget
			https://canhazip.com				# peu fiable wget
			https://tnx.nl/ip					# peu fiable wget
			ident.me							# http & https peu fiable curl
		)
	}

	list_ip6_dig(){		# testé 12/2017
		dig_test=(
		-6/myip.opendns.com/aaaa/@resolver1.ipv6-sandbox.opendns.com
		-6/myip.opendns.com/aaaa/@resolver2.ipv6-sandbox.opendns.com
		)
	}

	option="$1"
	unset fg_ip_pub
		# assignation variables
	if [ "$1" == "-4" ]; then
		ping -4 -c1 conncheck.opensuse.org &>/dev/null || ping -4 -c1 free.fr &>/dev/null || return 1	# test connectivité
		list_ip4_dig
		list_ip4
		ip_telnet=4.ifcfg.me
	elif [ "$1" == "-6" ]; then
		ping -6 -c1 conncheck.opensuse.org &>/dev/null || ping -6 -c1 free.fr &>/dev/null || return 1	# test connectivité
		list_ip6_dig
		list_ip6
		ip_telnet=6.ifcfg.me
	fi

unset fg_ip_pub
		# DIG
	if type -p dig &>/dev/null && [ -z "$fg_ip_pub" ]; then
		for iip in ${dig_test[*]}; do
			fg_ip_pub=$( dig +short ${iip//\// } )
echo -e "dig $option $iip \t ${fg_ip_pub:=FAIL}"
#			[ "$fg_ip_pub" ] && break
		done
	fi

unset fg_ip_pub
		# WGET
	if type -p wget &>/dev/null && [ -z "$fg_ip_pub" ]; then 
		cmd="wget --quiet --timeout=2 --tries=1 -O - "
		for iip in ${ip_test[*]}; do
			fg_ip_pub=$( $cmd $iip )
echo -e "wget $option $iip\t${fg_ip_pub:=FAIL}"
#			[ "$fg_ip_pub" ] && break
		done
	fi

unset fg_ip_pub
		# CURL
	if type -p curl &>/dev/null && [ -z "$fg_ip_pub" ]; then
		cmd="curl --silent --location --retry 0 --max-time 5"
		for iip in ${ip_test[*]}; do
			fg_ip_pub=$( $cmd $iip )
echo -e "curl $option $iip \t ${fg_ip_pub:=FAIL}"
#			[ "$fg_ip_pub" ] && break
		done
	fi

unset fg_ip_pub
		# TELNET
	if type -p telnet &>/dev/null && [ -z "$fg_ip_pub" ]; then
		fg_ip_pub=$( telnet $ip_telnet 23 2>/dev/null | grep "Your IPv${option/-}" )
		fg_ip_pub=${fg_ip_pub##* }
echo -e "telnet $option $ip_telnet \t ${fg_ip_pub:=FAIL}"
	fi

unset fg_ip_pub
		# NC
	if type -p nc &>/dev/null && [ -z "$fg_ip_pub" ] && [ "$option" != "-6" ]; then
		fg_ip_pub=$( nc $ip_telnet 23 2>/dev/null | grep "Your IPv${option/-}" )
		fg_ip_pub=${fg_ip_pub##* }
echo -e "nc $option $ip_telnet \t ${fg_ip_pub:=FAIL}"
	fi
}

get_fg_ip_pub "-4"
get_fg_ip_pub "-6"