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conn.go
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conn.go
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package conn
import (
"crypto/tls"
log "github.com/inconshreveable/go-tunnel/log"
util "github.com/inconshreveable/go-tunnel/util"
"io"
"net"
"sync"
)
var (
logger = log.NewTaggedLogger("go-tunnel/conn")
)
type Conn interface {
net.Conn
log.Logger
}
type Logged struct {
net.Conn
log.Logger
}
type Listener struct {
net.Addr
Conns chan *Logged
}
func wrapConn(conn net.Conn, tags ...string) *Logged {
switch c := conn.(type) {
case *Logged:
return c
default:
logged := &Logged{Conn: conn, Logger: log.NewTaggedLogger(util.RandId(4))}
logged.AddTags(tags...)
return logged
}
return nil
}
func Listen(addr, typ string, tlsCfg *tls.Config) (l *Listener, err error) {
// listen for incoming connections
listener, err := net.Listen("tcp", addr)
if err != nil {
return
}
l = &Listener{
Addr: listener.Addr(),
Conns: make(chan *Logged),
}
go func() {
for {
rawConn, err := listener.Accept()
if err != nil {
logger.Error("Failed to accept new TCP connection of type %s: %v", typ, err)
continue
}
c := wrapConn(rawConn, typ)
if tlsCfg != nil {
c.Conn = tls.Server(c.Conn, tlsCfg)
}
c.Info("New connection from %v", c.RemoteAddr())
l.Conns <- c
}
}()
return
}
func Wrap(conn net.Conn, tags ...string) *Logged {
return wrapConn(conn, tags...)
}
func (c *Logged) SetTags(tags ...string) {
c.Logger = log.NewTaggedLogger(tags...)
}
func (c *Logged) AddTags(tags ...string) {
c.Logger.AddTags(tags...)
}
func (c *Logged) StartTLS(tlsCfg *tls.Config) {
c.Conn = tls.Client(c.Conn, tlsCfg)
}
func (c *Logged) Close() (err error) {
if err := c.Conn.Close(); err == nil {
c.Debug("Closing")
}
return
}
func (c *Logged) Id() string {
return c.Logger.Name()
}
func Join(c Conn, c2 Conn) (int64, int64) {
var wait sync.WaitGroup
pipe := func(to Conn, from Conn, bytesCopied *int64) {
defer to.Close()
defer from.Close()
defer wait.Done()
var err error
*bytesCopied, err = io.Copy(to, from)
if err != nil {
from.Warn("Copied %d bytes to %s before failing with error %v", *bytesCopied, to.Name(), err)
} else {
from.Debug("Copied %d bytes to %s", *bytesCopied, to.Name())
}
}
wait.Add(2)
var fromBytes, toBytes int64
go pipe(c, c2, &fromBytes)
go pipe(c2, c, &toBytes)
c.Info("Joined with connection %s", c2.Name())
wait.Wait()
return fromBytes, toBytes
}