Add ipv6 support to ipinfo (#885)

modules/ipaddresses/ipinfo/widget.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"net"
 	"net/http"
 	"text/template"
 
@@ -50,7 +51,15 @@ func (widget *Widget) Refresh() {
 //this method reads the config and calls ipinfo for ip information
 func (widget *Widget) ipinfo() {
 	client := &http.Client{}
-	req, err := http.NewRequest("GET", "https://ipinfo.io/", nil)
+	var url string
+	ip, ipv6 := getMyIP()
+	if ipv6 {
+		url = fmt.Sprintf("https://ipinfo.io/%s", ip.String())
+	} else {
+		url = "https://ipinfo.io/"
+	}
+
+	req, err := http.NewRequest("GET", url, nil)
 	if err != nil {
 		widget.result = err.Error()
 		return
@@ -109,3 +118,21 @@ func (widget *Widget) setResult(info *ipinfo) {
 func formatableText(key, value string) string {
 	return fmt.Sprintf(" [{{.subheadingColor}}]%8s[-:-:-] [{{.valueColor}}]{{.%s}}\n", key, value)
 }
+
+// getMyIP provides this system's default IPv4 or IPv6 IP address for routing WAN requests.
+// It does so by dialing out to a site known to have both an A and AAAA DNS records (IPv6)
+// The 'net' package is allowed to decide how to connect, connecting to both IPv4 or IPv6 address
+// depending on the availbility of IP protocols.
+func getMyIP() (ip net.IP, v6 bool) {
+	conn, err := net.Dial("tcp", "fast.com:80")
+	if err != nil {
+		return
+	}
+	defer conn.Close()
+
+	addr := conn.LocalAddr().(*net.TCPAddr)
+	ip = addr.IP
+	v6 = ip.To4() == nil
+
+	return
+}