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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
#pragma once
#include <openvpn/common/exception.hpp>
#include <openvpn/common/lex.hpp>
#include <openvpn/buffer/buffer.hpp>
namespace openvpn {
/**
* Class PushLex is used to parse out the individual options
* in a comma-separated push options list.
*/
class PushLex
{
public:
OPENVPN_EXCEPTION(pushlex_error);
/**
* Setup parsing iterator for comma-separated push options list.
*
* @param buf Contains the comma-separated push options list.
* @param discard_prefix If the list begins with a "PUSH_REPLY"
* or "PUSH_UPDATE" prefix, discard the prefix.
*/
PushLex(const ConstBuffer &buf, const bool discard_prefix)
: buf_(buf)
{
if (!discard_prefix || !defined())
return;
if (!string::starts_with(buf_, "PUSH_"))
throw pushlex_error("not a valid PUSH_x message [1]");
buf_.advance(5);
while (defined())
{
const char c = buf_.pop_front();
if (c == ',')
return;
if (c >= 'A' && c <= 'Z')
continue;
}
throw pushlex_error("not a valid PUSH_x message [2]");
}
/**
* Use in iterator loop to determine if more options are
* still available to be fetched with next().
*
* @return true if next() may be called to return next option.
*/
bool defined() const
{
return !buf_.empty();
}
/**
* Use in iterator loop to fetch next option.
*
* @return next option.
*/
std::string next()
{
StandardLex lex;
std::string ret;
while (defined())
{
const char c = buf_.pop_front();
lex.put(c);
if (lex.get() == ',' && !(lex.in_quote() || lex.in_backslash()))
return ret;
ret += c;
}
return ret;
}
private:
ConstBuffer buf_;
};
} // namespace openvpn
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