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-rw-r--r--third_party/libwebrtc/net/dcsctp/socket/state_cookie.h65
1 files changed, 65 insertions, 0 deletions
diff --git a/third_party/libwebrtc/net/dcsctp/socket/state_cookie.h b/third_party/libwebrtc/net/dcsctp/socket/state_cookie.h
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index 0000000000..a26dbf86f7
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+++ b/third_party/libwebrtc/net/dcsctp/socket/state_cookie.h
@@ -0,0 +1,65 @@
+/*
+ * 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 = 36;
+
+ StateCookie(VerificationTag initiate_tag,
+ TSN initial_tsn,
+ uint32_t a_rwnd,
+ TieTag tie_tag,
+ Capabilities capabilities)
+ : initiate_tag_(initiate_tag),
+ initial_tsn_(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 initiate_tag() const { return initiate_tag_; }
+ TSN initial_tsn() const { return initial_tsn_; }
+ uint32_t a_rwnd() const { return a_rwnd_; }
+ TieTag tie_tag() const { return tie_tag_; }
+ const Capabilities& capabilities() const { return capabilities_; }
+
+ private:
+ const VerificationTag initiate_tag_;
+ const TSN initial_tsn_;
+ const uint32_t a_rwnd_;
+ const TieTag tie_tag_;
+ const Capabilities capabilities_;
+};
+} // namespace dcsctp
+
+#endif // NET_DCSCTP_SOCKET_STATE_COOKIE_H_