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/*
* Copyright (c) 2014, Yawning Angel <yawning at torproject dot org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package main
import (
"errors"
"fmt"
"net"
"net/url"
"os"
"strconv"
"git.torproject.org/pluggable-transports/goptlib.git"
)
// This file contains things that probably should be in goptlib but are not
// yet or are not finalized.
func ptEnvError(msg string) error {
line := []byte(fmt.Sprintf("ENV-ERROR %s\n", msg))
pt.Stdout.Write(line)
return errors.New(msg)
}
func ptProxyError(msg string) error {
line := []byte(fmt.Sprintf("PROXY-ERROR %s\n", msg))
pt.Stdout.Write(line)
return errors.New(msg)
}
func ptProxyDone() {
line := []byte("PROXY DONE\n")
pt.Stdout.Write(line)
}
func ptIsClient() (bool, error) {
clientEnv := os.Getenv("TOR_PT_CLIENT_TRANSPORTS")
serverEnv := os.Getenv("TOR_PT_SERVER_TRANSPORTS")
if clientEnv != "" && serverEnv != "" {
return false, ptEnvError("TOR_PT_[CLIENT,SERVER]_TRANSPORTS both set")
} else if clientEnv != "" {
return true, nil
} else if serverEnv != "" {
return false, nil
}
return false, errors.New("not launched as a managed transport")
}
func ptGetProxy() (*url.URL, error) {
specString := os.Getenv("TOR_PT_PROXY")
if specString == "" {
return nil, nil
}
spec, err := url.Parse(specString)
if err != nil {
return nil, ptProxyError(fmt.Sprintf("failed to parse proxy config: %s", err))
}
// Validate the TOR_PT_PROXY uri.
if !spec.IsAbs() {
return nil, ptProxyError("proxy URI is relative, must be absolute")
}
if spec.Path != "" {
return nil, ptProxyError("proxy URI has a path defined")
}
if spec.RawQuery != "" {
return nil, ptProxyError("proxy URI has a query defined")
}
if spec.Fragment != "" {
return nil, ptProxyError("proxy URI has a fragment defined")
}
switch spec.Scheme {
case "http":
// The most forgiving of proxies.
case "socks4a":
if spec.User != nil {
_, isSet := spec.User.Password()
if isSet {
return nil, ptProxyError("proxy URI specified SOCKS4a and a password")
}
}
case "socks5":
if spec.User != nil {
// UNAME/PASSWD both must be between 1 and 255 bytes long. (RFC1929)
user := spec.User.Username()
passwd, isSet := spec.User.Password()
if len(user) < 1 || len(user) > 255 {
return nil, ptProxyError("proxy URI specified a invalid SOCKS5 username")
}
if !isSet || len(passwd) < 1 || len(passwd) > 255 {
return nil, ptProxyError("proxy URI specified a invalid SOCKS5 password")
}
}
default:
return nil, ptProxyError(fmt.Sprintf("proxy URI has invalid scheme: %s", spec.Scheme))
}
_, err = resolveAddrStr(spec.Host)
if err != nil {
return nil, ptProxyError(fmt.Sprintf("proxy URI has invalid host: %s", err))
}
return spec, nil
}
// Sigh, pt.resolveAddr() isn't exported. Include our own getto version that
// doesn't work around #7011, because we don't work with pre-0.2.5.x tor, and
// all we care about is validation anyway.
func resolveAddrStr(addrStr string) (*net.TCPAddr, error) {
ipStr, portStr, err := net.SplitHostPort(addrStr)
if err != nil {
return nil, err
}
if ipStr == "" {
return nil, net.InvalidAddrError(fmt.Sprintf("address string %q lacks a host part", addrStr))
}
if portStr == "" {
return nil, net.InvalidAddrError(fmt.Sprintf("address string %q lacks a port part", addrStr))
}
ip := net.ParseIP(ipStr)
if ip == nil {
return nil, net.InvalidAddrError(fmt.Sprintf("not an IP string: %q", ipStr))
}
port, err := strconv.ParseUint(portStr, 10, 16)
if err != nil {
return nil, net.InvalidAddrError(fmt.Sprintf("not a Port string: %q", portStr))
}
return &net.TCPAddr{IP: ip, Port: int(port), Zone: ""}, nil
}
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