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