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package webircgateway
import (
"bufio"
"net"
"strings"
"sync"
)
type TransportTcp struct {
gateway *Gateway
}
func (t *TransportTcp) Init(g *Gateway) {
t.gateway = g
}
func (t *TransportTcp) Start(lAddr string) {
l, err := net.Listen("tcp", lAddr)
if err != nil {
t.gateway.Log(3, "TCP error listening: "+err.Error())
return
}
// Close the listener when the application closes.
defer l.Close()
t.gateway.Log(2, "TCP listening on "+lAddr)
for {
// Listen for an incoming connection.
conn, err := l.Accept()
if err != nil {
t.gateway.Log(3, "TCP error accepting: "+err.Error())
break
}
// Handle connections in a new goroutine.
go t.handleConn(conn)
}
}
func (t *TransportTcp) handleConn(conn net.Conn) {
client := t.gateway.NewClient()
client.RemoteAddr = conn.RemoteAddr().String()
clientHostnames, err := net.LookupAddr(client.RemoteAddr)
if err != nil {
client.RemoteHostname = client.RemoteAddr
} else {
// FQDNs include a . at the end. Strip it out
potentialHostname := strings.Trim(clientHostnames[0], ".")
// Must check that the resolved hostname also resolves back to the users IP
addr, err := net.LookupIP(potentialHostname)
if err == nil && len(addr) == 1 && addr[0].String() == client.RemoteAddr {
client.RemoteHostname = potentialHostname
} else {
client.RemoteHostname = client.RemoteAddr
}
}
_, remoteAddrPort, _ := net.SplitHostPort(conn.RemoteAddr().String())
client.Tags["remote-port"] = remoteAddrPort
client.Log(2, "New tcp client on %s from %s %s", conn.LocalAddr().String(), client.RemoteAddr, client.RemoteHostname)
client.Ready()
// We wait until the client send queue has been drained
var sendDrained sync.WaitGroup
sendDrained.Add(1)
// Read from TCP
go func() {
reader := bufio.NewReader(conn)
for {
data, err := reader.ReadString('\n')
if err == nil {
message := strings.TrimRight(data, "\r\n")
client.Log(1, "client->: %s", message)
select {
case client.Recv <- message:
default:
client.Log(3, "Recv queue full. Dropping data")
// TODO: Should this really just drop the data or close the connection?
}
} else {
client.Log(1, "TCP connection closed (%s)", err.Error())
break
}
}
close(client.Recv)
}()
// Process signals for the client
for {
signal, ok := <-client.Signals
if !ok {
sendDrained.Done()
break
}
if signal[0] == "data" {
//line := strings.Trim(signal[1], "\r\n")
line := signal[1] + "\n"
client.Log(1, "->tcp: %s", signal[1])
conn.Write([]byte(line))
}
}
sendDrained.Wait()
conn.Close()
}
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