66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
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/*
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* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef NET_DCSCTP_SOCKET_STATE_COOKIE_H_
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#define NET_DCSCTP_SOCKET_STATE_COOKIE_H_
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#include <cstdint>
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#include <vector>
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#include "absl/types/optional.h"
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#include "api/array_view.h"
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#include "net/dcsctp/common/internal_types.h"
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#include "net/dcsctp/socket/capabilities.h"
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namespace dcsctp {
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// This is serialized as a state cookie and put in INIT_ACK. The client then
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// responds with this in COOKIE_ECHO.
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//
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// NOTE: Expect that the client will modify it to try to exploit the library.
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// Do not trust anything in it; no pointers or anything like that.
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class StateCookie {
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public:
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static constexpr size_t kCookieSize = 31;
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StateCookie(VerificationTag initiate_tag,
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TSN initial_tsn,
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uint32_t a_rwnd,
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TieTag tie_tag,
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Capabilities capabilities)
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: initiate_tag_(initiate_tag),
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initial_tsn_(initial_tsn),
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a_rwnd_(a_rwnd),
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tie_tag_(tie_tag),
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capabilities_(capabilities) {}
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// Returns a serialized version of this cookie.
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std::vector<uint8_t> Serialize();
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// Deserializes the cookie, and returns absl::nullopt if that failed.
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static absl::optional<StateCookie> Deserialize(
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rtc::ArrayView<const uint8_t> cookie);
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VerificationTag initiate_tag() const { return initiate_tag_; }
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TSN initial_tsn() const { return initial_tsn_; }
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uint32_t a_rwnd() const { return a_rwnd_; }
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TieTag tie_tag() const { return tie_tag_; }
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const Capabilities& capabilities() const { return capabilities_; }
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private:
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const VerificationTag initiate_tag_;
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const TSN initial_tsn_;
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const uint32_t a_rwnd_;
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const TieTag tie_tag_;
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const Capabilities capabilities_;
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};
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} // namespace dcsctp
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#endif // NET_DCSCTP_SOCKET_STATE_COOKIE_H_
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