Perform DNS lookup of client addresses

README

@@ -11,7 +11,7 @@ It does not aim to replace full featured mass scalable IRC networks:
 * It can not connect to other servers. Just standalone installation
 * It has few basic IRC commands
 * There is no support for channel operators, modes, votes, invites
-* No ident lookups, reverse DNS queries
+* No ident lookups
 
 But it has some convincing features:
 

client.go

@@ -51,8 +51,19 @@ type Client struct {
 	sync.Mutex
 }
 
+func (c Client) Host() string {
+	addr := c.conn.RemoteAddr().String()
+	if host, _, err := net.SplitHostPort(addr); err == nil {
+		addr = host
+	}
+	if domains, err := net.LookupAddr(addr); err == nil {
+		addr = strings.TrimSuffix(domains[0], ".")
+	}
+	return addr
+}
+
 func (c Client) String() string {
-	return *c.nickname + "!" + *c.username + "@" + c.conn.RemoteAddr().String()
+	return *c.nickname + "!" + *c.username + "@" + c.Host()
 }
 
 func NewClient(conn net.Conn) *Client {

room.go

@@ -142,7 +142,7 @@ func (room *Room) Processor(events <-chan ClientEvent) {
 					"352",
 					*room.name,
 					*m.username,
-					m.conn.RemoteAddr().String(),
+					m.Host(),
 					*hostname,
 					*m.nickname,
 					"H",