From 66eaa48372228e098b464e8eac64d15a8582e9ef Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Busse?= <mail@baerlin.eu>
Date: Sun, 18 Oct 2015 22:07:57 +0200
Subject: [PATCH] Perform DNS lookup of client addresses

---
 README    |  2 +-
 client.go | 13 ++++++++++++-
 room.go   |  2 +-
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/README b/README
index b6291ea..3793978 100644
--- a/README
+++ b/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:
 
diff --git a/client.go b/client.go
index a43cc1e..fbaf8a3 100644
--- a/client.go
+++ b/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 {
diff --git a/room.go b/room.go
index 2a5f22a..276397f 100644
--- a/room.go
+++ b/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",