107 lines
2.6 KiB
Go
107 lines
2.6 KiB
Go
/*
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* Copyright (c) 2021 IBM Corp and others.
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*
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v2.0
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* and Eclipse Distribution License v1.0 which accompany this distribution.
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*
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* The Eclipse Public License is available at
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* https://www.eclipse.org/legal/epl-2.0/
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* and the Eclipse Distribution License is available at
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* http://www.eclipse.org/org/documents/edl-v10.php.
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*
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* Contributors:
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* Seth Hoenig
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* Allan Stockdill-Mander
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* Mike Robertson
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* MAtt Brittan
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*/
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package mqtt
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import (
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"crypto/tls"
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"errors"
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"net"
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"net/http"
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"net/url"
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"os"
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"time"
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"golang.org/x/net/proxy"
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)
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//
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// This just establishes the network connection; once established the type of connection should be irrelevant
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//
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// openConnection opens a network connection using the protocol indicated in the URL.
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// Does not carry out any MQTT specific handshakes.
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func openConnection(uri *url.URL, tlsc *tls.Config, timeout time.Duration, headers http.Header, websocketOptions *WebsocketOptions, dialer *net.Dialer) (net.Conn, error) {
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switch uri.Scheme {
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case "ws":
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conn, err := NewWebsocket(uri.String(), nil, timeout, headers, websocketOptions)
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return conn, err
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case "wss":
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conn, err := NewWebsocket(uri.String(), tlsc, timeout, headers, websocketOptions)
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return conn, err
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case "mqtt", "tcp":
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allProxy := os.Getenv("all_proxy")
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if len(allProxy) == 0 {
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conn, err := dialer.Dial("tcp", uri.Host)
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if err != nil {
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return nil, err
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}
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return conn, nil
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}
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proxyDialer := proxy.FromEnvironment()
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conn, err := proxyDialer.Dial("tcp", uri.Host)
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if err != nil {
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return nil, err
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}
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return conn, nil
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case "unix":
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var conn net.Conn
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var err error
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// this check is preserved for compatibility with older versions
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// which used uri.Host only (it works for local paths, e.g. unix://socket.sock in current dir)
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if len(uri.Host) > 0 {
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conn, err = dialer.Dial("unix", uri.Host)
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} else {
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conn, err = dialer.Dial("unix", uri.Path)
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}
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if err != nil {
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return nil, err
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}
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return conn, nil
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case "ssl", "tls", "mqtts", "mqtt+ssl", "tcps":
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allProxy := os.Getenv("all_proxy")
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if len(allProxy) == 0 {
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conn, err := tls.DialWithDialer(dialer, "tcp", uri.Host, tlsc)
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if err != nil {
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return nil, err
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}
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return conn, nil
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}
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proxyDialer := proxy.FromEnvironment()
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conn, err := proxyDialer.Dial("tcp", uri.Host)
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if err != nil {
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return nil, err
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}
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tlsConn := tls.Client(conn, tlsc)
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err = tlsConn.Handshake()
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if err != nil {
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_ = conn.Close()
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return nil, err
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}
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return tlsConn, nil
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}
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return nil, errors.New("unknown protocol")
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}
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