ricochet-go/vendor/github.com/yawning/bulb/dialer.go

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// dialer.go - Tor backed proxy.Dialer.
//
// To the extent possible under law, Yawning Angel waived all copyright
// and related or neighboring rights to bulb, using the creative
// commons "cc0" public domain dedication. See LICENSE or
// <http://creativecommons.org/publicdomain/zero/1.0/> for full details.
package bulb
import (
"strconv"
"strings"
"golang.org/x/net/proxy"
)
// Dialer returns a proxy.Dialer for the given Tor instance.
func (c *Conn) Dialer(auth *proxy.Auth) (proxy.Dialer, error) {
const (
cmdGetInfo = "GETINFO"
socksListeners = "net/listeners/socks"
unixPrefix = "unix:"
)
// Query for the SOCKS listeners via a GETINFO request.
resp, err := c.Request("%s %s", cmdGetInfo, socksListeners)
if err != nil {
return nil, err
}
if len(resp.Data) != 1 {
return nil, newProtocolError("no SOCKS listeners configured")
}
splitResp := strings.Split(resp.Data[0], " ")
if len(splitResp) < 1 {
return nil, newProtocolError("no SOCKS listeners configured")
}
// The first listener will have a "net/listeners/socks=" prefix, and all
// entries are QuotedStrings.
laddrStr := strings.TrimPrefix(splitResp[0], socksListeners+"=")
if laddrStr == splitResp[0] {
return nil, newProtocolError("failed to parse SOCKS listener")
}
laddrStr, _ = strconv.Unquote(laddrStr)
// Construct the proxyDialer.
if strings.HasPrefix(laddrStr, unixPrefix) {
unixPath := strings.TrimPrefix(laddrStr, unixPrefix)
return proxy.SOCKS5("unix", unixPath, auth, proxy.Direct)
}
return proxy.SOCKS5("tcp", laddrStr, auth, proxy.Direct)
}