client: Show real IP and whether the target's using TLS in WHOIS

irc/client.go

@@ -150,6 +150,15 @@ func (client *Client) IP() net.IP {
 	return net.ParseIP(IPString(client.socket.conn.RemoteAddr()))
 }
 
+// IPString returns the IP address of this client as a string.
+func (client *Client) IPString() string {
+	ip := client.IP().String()
+	if 0 < len(ip) && ip[0] == ':' {
+		ip = "0" + ip
+	}
+	return ip
+}
+
 //
 // command goroutine
 //

irc/numerics.go

@@ -72,6 +72,7 @@ const (
 	RPL_NOTOPIC                     = "331"
 	RPL_TOPIC                       = "332"
 	RPL_TOPICTIME                   = "333"
+	RPL_WHOISACTUALLY               = "338"
 	RPL_INVITING                    = "341"
 	RPL_SUMMONING                   = "342"
 	RPL_INVITELIST                  = "346"
@@ -158,6 +159,7 @@ const (
 	ERR_USERSDONTMATCH              = "502"
 	ERR_HELPNOTFOUND                = "524"
 	ERR_CANNOTSENDRP                = "573"
+	RPL_WHOISSECURE                 = "671"
 	RPL_HELPSTART                   = "704"
 	RPL_HELPTXT                     = "705"
 	RPL_ENDOFHELP                   = "706"

irc/server.go

@@ -1273,6 +1273,12 @@ func (client *Client) getWhoisOf(target *Client) {
 	if target.class != nil {
 		client.Send(nil, client.server.name, RPL_WHOISOPERATOR, client.nick, target.nick, target.whoisLine)
 	}
+	if client.flags[Operator] || client == target {
+		client.Send(nil, client.server.name, RPL_WHOISACTUALLY, client.nick, target.nick, fmt.Sprintf("%s@%s", target.username, LookupHostname(target.IPString())), target.IPString(), "Actual user@host, Actual IP")
+	}
+	if target.flags[TLS] {
+		client.Send(nil, client.server.name, RPL_WHOISSECURE, client.nick, target.nick, "is using a secure connection")
+	}
 	if target.certfp != "" && (client.flags[Operator] || client == target) {
 		client.Send(nil, client.server.name, RPL_WHOISCERTFP, client.nick, target.nick, fmt.Sprintf("has client certificate fingerprint %s", target.certfp))
 	}