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98 lines
2.9 KiB
Go
98 lines
2.9 KiB
Go
/*
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* Copyright (c) 2015, Yawning Angel <yawning at schwanenlied dot me>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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package socks5
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import (
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"fmt"
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"gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/goptlib"
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)
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// parseClientParameters takes a client parameter string formatted according to
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// "Passing PT-specific parameters to a client PT" in the pluggable transport
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// specification, and returns it as a goptlib Args structure.
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//
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// This is functionally identical to the equivalently named goptlib routine.
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func parseClientParameters(argStr string) (pt.Args, error) {
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args := make(pt.Args)
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if len(argStr) == 0 {
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return args, nil
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}
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var key string
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acc := make([]byte, 0, len(argStr))
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prevIsEscape := false
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for idx, ch := range []byte(argStr) {
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switch ch {
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case '\\':
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prevIsEscape = !prevIsEscape
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if prevIsEscape {
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continue
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}
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case '=':
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if !prevIsEscape {
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if key != "" {
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break
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}
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if len(acc) == 0 {
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return nil, fmt.Errorf("unexpected '=' at %d", idx)
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}
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key = string(acc)
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acc = nil
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continue
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}
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case ';':
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if !prevIsEscape {
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if key == "" || idx == len(argStr)-1 {
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return nil, fmt.Errorf("unexpected ';' at %d", idx)
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}
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args.Add(key, string(acc))
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key = ""
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acc = nil
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continue
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}
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default:
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if prevIsEscape {
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return nil, fmt.Errorf("unexpected '\\' at %d", idx-1)
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}
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}
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prevIsEscape = false
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acc = append(acc, ch)
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}
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if prevIsEscape {
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return nil, fmt.Errorf("underminated escape character")
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}
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// Handle the final k,v pair if any.
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if key == "" {
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return nil, fmt.Errorf("final key with no value")
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}
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args.Add(key, string(acc))
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return args, nil
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}
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