GetHost() now handles IPv4 and IPv6 addresses

goutmp.go

@@ -78,6 +78,7 @@ import "C"
 
 import (
 	"fmt"
+	"log"
 	"net"
 	"os/user"
 	"strings"
@@ -90,22 +91,27 @@ type UtmpEntry struct {
 }
 
 // return remote client hostname or IP if host lookup fails
+// addr is expected to be of the format given by net.Addr.String()
+// eg., "127.0.0.1:80" or "[::1]:80"
 func GetHost(addr string) (h string) {
-	// Strip off the port after IP addr
+	if !strings.Contains(addr, "[") {
-	hList, e := net.LookupAddr(strings.Split(addr,":")[0])
-	fmt.Printf("lookupAddr:%v\n", hList)
-	if e != nil {
 		h = strings.Split(addr, ":")[0]
 	} else {
+		h = strings.Split(strings.Split(addr, "[")[1], "]")[0]
+	}
+	hList, e := net.LookupAddr(h)
+	//fmt.Printf("lookupAddr:%v\n", hList)
+	if e == nil {
 		h = hList[0]
 	}
 	return
 }
 
 // Put a username and the originating host/IP to utmp
-func Put_utmp(user string, host string) (UtmpEntry) {
+func Put_utmp(user string, host string) UtmpEntry {
 	var entry UtmpEntry
 
+	log.Println("Put_utmp:host ", host, " user ", user)
 	C.pututmp(&entry.entry, C.CString(user), C.CString(host))
 	return entry
 }

main/test.go

@@ -1,8 +1,9 @@
 package main
 
 import (
-	"blitter.com/go/goutmp"
 	"time"
+
+	"blitter.com/go/goutmp"
 )
 
 func main() {