debugging on fqdn

Signed-off-by: Jeff Carr <jcarr@wit.com>

crash1-fqdn

@@ -1,3 +1,5 @@
+This thing segfault'd with fqdn lookup on weird network errors when I was at the office on wifi
+
 2019/06/01 21:11:47 connecting to ws://v000185.testing.com.customers.wprod.wit.com:9000/event
 2019/06/01 21:11:47 fqdn.Get() =  librem15.lab.wit.com
 INFO[0000] *** error: read udp [2604:bbc0:1:22::f5d3:7f44]:50435->[2001:500:12::d0d]:53: i/o timeout

fqdn.go

@@ -1,30 +1,36 @@
 package main
 
-import (
-	"net"
-	"os"
-	"strings"
-)
+import "net"
+import "os"
+import "strings"
+import "log"
 
 // Get Fully Qualified Domain Name
 // returns "unknown" or hostanme in case of error
-func FqdnGet() string {
+func fqdnGet() string {
+	log.Println("fqdnGet() START")
 	hostname, err := os.Hostname()
 	if err != nil {
 		return "unknown"
 	}
 
+	log.Println("\tfqdnGet() net.LookupIP(hostname) hostname =", hostname)
 	addrs, err := net.LookupIP(hostname)
 	if err != nil {
+		log.Println("\tfqdnGet() net.LookupIP(hostname) err =", err)
 		return hostname
 	}
 
+	log.Println("\tfqdnGet() range addrs")
 	for _, addr := range addrs {
+		log.Println("\tfqdnGet() addr = ", addr)
 		if ipv4 := addr.To4(); ipv4 != nil {
 			ip, err := ipv4.MarshalText()
+			log.Println("\tfqdnGet() ip = ", string(ip))
 			if err != nil {
 				return hostname
 			}
+			log.Println("\tfqdnGet() net.LookupAddr = ", string(ip))
 			hosts, err := net.LookupAddr(string(ip))
 			if err != nil || len(hosts) == 0 {
 				return hostname

main.go

@@ -106,8 +106,8 @@ func main() {
 	// use this to discover what the OS thinks it's hostname is
 	// seems to be cross platform (?)
 	// Windows: WMIC computersystem where caption='current_pc_name' rename new_pc_name
-	hostname := FqdnGet()
-	log.Println("fqdn.Get() = ", hostname)
+	hostname := fqdnGet()
+	log.Println("fqdnGet() = ", hostname)
 	config.Hostname	= hostname
 
 	// this is a recursive dig for the AAAA record