syncthing/lib/connections/connections_tcp.go

93 lines
2.2 KiB
Go

// Copyright (C) 2015 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
package connections
import (
"crypto/tls"
"net"
"net/url"
"strings"
"github.com/syncthing/syncthing/lib/dialer"
"github.com/syncthing/syncthing/lib/model"
"github.com/syncthing/syncthing/lib/osutil"
)
func init() {
dialers["tcp"] = tcpDialer
listeners["tcp"] = tcpListener
}
func tcpDialer(uri *url.URL, tlsCfg *tls.Config) (*tls.Conn, error) {
// Check that there is a port number in uri.Host, otherwise add one.
host, port, err := net.SplitHostPort(uri.Host)
if err != nil && strings.HasPrefix(err.Error(), "missing port") {
// addr is on the form "1.2.3.4"
uri.Host = net.JoinHostPort(uri.Host, "22000")
} else if err == nil && port == "" {
// addr is on the form "1.2.3.4:"
uri.Host = net.JoinHostPort(host, "22000")
}
// Don't try to resolve the address before dialing. The dialer may be a
// proxy, and we should let the proxy do the resolving in that case.
conn, err := dialer.Dial("tcp", uri.Host)
if err != nil {
l.Debugln(err)
return nil, err
}
tc := tls.Client(conn, tlsCfg)
err = tc.Handshake()
if err != nil {
tc.Close()
return nil, err
}
return tc, nil
}
func tcpListener(uri *url.URL, tlsCfg *tls.Config, conns chan<- model.IntermediateConnection) {
tcaddr, err := net.ResolveTCPAddr("tcp", uri.Host)
if err != nil {
l.Fatalln("listen (BEP/tcp):", err)
return
}
listener, err := net.ListenTCP("tcp", tcaddr)
if err != nil {
l.Fatalln("listen (BEP/tcp):", err)
return
}
for {
conn, err := listener.Accept()
if err != nil {
l.Warnln("Accepting connection (BEP/tcp):", err)
continue
}
l.Debugln("connect from", conn.RemoteAddr())
err = osutil.SetTCPOptions(conn.(*net.TCPConn))
if err != nil {
l.Infoln(err)
}
tc := tls.Server(conn, tlsCfg)
err = tc.Handshake()
if err != nil {
l.Infoln("TLS handshake (BEP/tcp):", err)
tc.Close()
continue
}
conns <- model.IntermediateConnection{
tc, model.ConnectionTypeDirectAccept,
}
}
}