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/*
* Copyright (c) 2015, 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 socks5
import (
"fmt"
"github.com/OperatorFoundation/shapeshifter-ipc"
)
// parseClientParameters takes a client parameter string formatted according to
// "Passing PT-specific parameters to a client PT" in the pluggable transport
// specification, and returns it as a goptlib Args structure.
//
// This is functionally identical to the equivalently named goptlib routine.
func parseClientParameters(argStr string) (args pt.Args, err error) {
args = make(pt.Args)
if len(argStr) == 0 {
return
}
var key string
var acc []byte
prevIsEscape := false
for idx, ch := range []byte(argStr) {
switch ch {
case '\\':
prevIsEscape = !prevIsEscape
if prevIsEscape {
continue
}
case '=':
if !prevIsEscape {
if key != "" {
break
}
if len(acc) == 0 {
return nil, fmt.Errorf("unexpected '=' at %d", idx)
}
key = string(acc)
acc = nil
continue
}
case ';':
if !prevIsEscape {
if key == "" || idx == len(argStr)-1 {
return nil, fmt.Errorf("unexpected ';' at %d", idx)
}
args.Add(key, string(acc))
key = ""
acc = nil
continue
}
default:
if prevIsEscape {
return nil, fmt.Errorf("unexpected '\\' at %d", idx-1)
}
}
prevIsEscape = false
acc = append(acc, ch)
}
if prevIsEscape {
return nil, fmt.Errorf("underminated escape character")
}
// Handle the final k,v pair if any.
if key == "" {
return nil, fmt.Errorf("final key with no value")
}
args.Add(key, string(acc))
return args, nil
}
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