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/*
* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef NET_DCSCTP_SOCKET_STATE_COOKIE_H_
#define NET_DCSCTP_SOCKET_STATE_COOKIE_H_
#include <cstdint>
#include <vector>
#include "absl/types/optional.h"
#include "api/array_view.h"
#include "net/dcsctp/common/internal_types.h"
#include "net/dcsctp/socket/capabilities.h"
namespace dcsctp {
// This is serialized as a state cookie and put in INIT_ACK. The client then
// responds with this in COOKIE_ECHO.
//
// NOTE: Expect that the client will modify it to try to exploit the library.
// Do not trust anything in it; no pointers or anything like that.
class StateCookie {
public:
static constexpr size_t kCookieSize = 45;
StateCookie(VerificationTag peer_tag,
VerificationTag my_tag,
TSN peer_initial_tsn,
TSN my_initial_tsn,
uint32_t a_rwnd,
TieTag tie_tag,
Capabilities capabilities)
: peer_tag_(peer_tag),
my_tag_(my_tag),
peer_initial_tsn_(peer_initial_tsn),
my_initial_tsn_(my_initial_tsn),
a_rwnd_(a_rwnd),
tie_tag_(tie_tag),
capabilities_(capabilities) {}
// Returns a serialized version of this cookie.
std::vector<uint8_t> Serialize();
// Deserializes the cookie, and returns absl::nullopt if that failed.
static absl::optional<StateCookie> Deserialize(
rtc::ArrayView<const uint8_t> cookie);
VerificationTag peer_tag() const { return peer_tag_; }
VerificationTag my_tag() const { return my_tag_; }
TSN peer_initial_tsn() const { return peer_initial_tsn_; }
TSN my_initial_tsn() const { return my_initial_tsn_; }
uint32_t a_rwnd() const { return a_rwnd_; }
TieTag tie_tag() const { return tie_tag_; }
const Capabilities& capabilities() const { return capabilities_; }
private:
// Also called "Tag_A" in RFC4960.
const VerificationTag peer_tag_;
// Also called "Tag_Z" in RFC4960.
const VerificationTag my_tag_;
const TSN peer_initial_tsn_;
const TSN my_initial_tsn_;
const uint32_t a_rwnd_;
const TieTag tie_tag_;
const Capabilities capabilities_;
};
} // namespace dcsctp
#endif // NET_DCSCTP_SOCKET_STATE_COOKIE_H_
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