From c7fce11e01d68862e9a1ca2601747c92d4743e89 Mon Sep 17 00:00:00 2001
From: raylu <raylu@cmu.edu>
Date: Wed, 9 Mar 2011 23:47:07 -0600
Subject: [PATCH] identd support

---
 rbot.conf.example |  3 +++
 rbot.go           | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/rbot.conf.example b/rbot.conf.example
index 5dcea71..50d8988 100644
--- a/rbot.conf.example
+++ b/rbot.conf.example
@@ -1,5 +1,8 @@
 [DEFAULT]
 trigger: !
+# 0 means don't run an identd. ircds expect 113, but on Linux that requires root
+# most users should be able to set it to 1130 and port forward 113->1130
+identdport: 0
 
 [Rizon]
 server: irc.rizon.net
diff --git a/rbot.go b/rbot.go
index 82d1911..9ee852f 100644
--- a/rbot.go
+++ b/rbot.go
@@ -6,6 +6,8 @@ import (
 	"os"
 	"strings"
 	"time"
+	"net"
+	"bufio"
 	"crypto/tls"
 	"crypto/rand"
 	"goconfig"
@@ -21,6 +23,11 @@ func main() {
 	trigger = readConfString("DEFAULT", "trigger")
 	readAuth()
 
+	identdport, _ := conf.String("DEFAULT", "identdport")
+	if identdport != "" && identdport != "0" {
+		go identd(identdport)
+	}
+
 	sections = conf.Sections()
 	for _, s := range sections {
 		if strings.Index(s, " ") == -1 && s != "DEFAULT" {
@@ -123,3 +130,34 @@ func updateConf(section, option, value string) {
 	// config.WriteFile destroys the config, so
 	readConf()
 }
+
+func identd(port string) {
+	identd, err := net.Listen("tcp", "0.0.0.0:" + port)
+	if err != nil {
+		fmt.Println("Failed to start identd on port", port)
+		return
+	}
+	defer identd.Close()
+	fmt.Println("Started identd on port", port)
+
+	for {
+		conn, err := identd.Accept()
+		if err != nil {
+			fmt.Println("Failed to accept identd connection")
+			continue
+		}
+
+		io := bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
+		line, err := io.Reader.ReadString('\n')
+		if err != nil || len(line) < 2 {
+			conn.Close()
+			fmt.Println("Failed to read identd request")
+			continue
+		}
+		line = line[:len(line) - 2]
+		line = fmt.Sprintf("%s : ERROR : NO-USER\r\n", line)
+		io.Writer.WriteString(line)
+		time.Sleep(1000000000) // 1 second
+		conn.Close()
+	}
+}