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diff --git a/third_party/libwebrtc/api/transport/stun.h b/third_party/libwebrtc/api/transport/stun.h new file mode 100644 index 0000000000..c2c9ad4b9c --- /dev/null +++ b/third_party/libwebrtc/api/transport/stun.h @@ -0,0 +1,798 @@ +/* + * Copyright 2004 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 API_TRANSPORT_STUN_H_ +#define API_TRANSPORT_STUN_H_ + +// This file contains classes for dealing with the STUN protocol, as specified +// in RFC 5389, and its descendants. + +#include <stddef.h> +#include <stdint.h> + +#include <functional> +#include <memory> +#include <string> +#include <vector> + +#include "absl/strings/string_view.h" +#include "api/array_view.h" +#include "rtc_base/byte_buffer.h" +#include "rtc_base/ip_address.h" +#include "rtc_base/socket_address.h" + +namespace cricket { + +// These are the types of STUN messages defined in RFC 5389. +enum StunMessageType : uint16_t { + STUN_INVALID_MESSAGE_TYPE = 0x0000, + STUN_BINDING_REQUEST = 0x0001, + STUN_BINDING_INDICATION = 0x0011, + STUN_BINDING_RESPONSE = 0x0101, + STUN_BINDING_ERROR_RESPONSE = 0x0111, + + // Method 0x80, GOOG-PING is a variant of STUN BINDING + // that is sent instead of a STUN BINDING if the binding + // was identical to the one before. + GOOG_PING_REQUEST = 0x200, + GOOG_PING_RESPONSE = 0x300, + GOOG_PING_ERROR_RESPONSE = 0x310, +}; + +// These are all known STUN attributes, defined in RFC 5389 and elsewhere. +// Next to each is the name of the class (T is StunTAttribute) that implements +// that type. +// RETRANSMIT_COUNT is the number of outstanding pings without a response at +// the time the packet is generated. +enum StunAttributeType { + STUN_ATTR_MAPPED_ADDRESS = 0x0001, // Address + STUN_ATTR_USERNAME = 0x0006, // ByteString + STUN_ATTR_MESSAGE_INTEGRITY = 0x0008, // ByteString, 20 bytes + STUN_ATTR_ERROR_CODE = 0x0009, // ErrorCode + STUN_ATTR_UNKNOWN_ATTRIBUTES = 0x000a, // UInt16List + STUN_ATTR_REALM = 0x0014, // ByteString + STUN_ATTR_NONCE = 0x0015, // ByteString + STUN_ATTR_XOR_MAPPED_ADDRESS = 0x0020, // XorAddress + STUN_ATTR_SOFTWARE = 0x8022, // ByteString + STUN_ATTR_ALTERNATE_SERVER = 0x8023, // Address + STUN_ATTR_FINGERPRINT = 0x8028, // UInt32 + STUN_ATTR_RETRANSMIT_COUNT = 0xFF00 // UInt32 +}; + +// These are the types of the values associated with the attributes above. +// This allows us to perform some basic validation when reading or adding +// attributes. Note that these values are for our own use, and not defined in +// RFC 5389. +enum StunAttributeValueType { + STUN_VALUE_UNKNOWN = 0, + STUN_VALUE_ADDRESS = 1, + STUN_VALUE_XOR_ADDRESS = 2, + STUN_VALUE_UINT32 = 3, + STUN_VALUE_UINT64 = 4, + STUN_VALUE_BYTE_STRING = 5, + STUN_VALUE_ERROR_CODE = 6, + STUN_VALUE_UINT16_LIST = 7 +}; + +// These are the types of STUN addresses defined in RFC 5389. +enum StunAddressFamily { + // NB: UNDEF is not part of the STUN spec. + STUN_ADDRESS_UNDEF = 0, + STUN_ADDRESS_IPV4 = 1, + STUN_ADDRESS_IPV6 = 2 +}; + +// These are the types of STUN error codes defined in RFC 5389. +enum StunErrorCode { + STUN_ERROR_TRY_ALTERNATE = 300, + STUN_ERROR_BAD_REQUEST = 400, + STUN_ERROR_UNAUTHORIZED = 401, + STUN_ERROR_UNKNOWN_ATTRIBUTE = 420, + STUN_ERROR_STALE_NONCE = 438, + STUN_ERROR_SERVER_ERROR = 500, + STUN_ERROR_GLOBAL_FAILURE = 600 +}; + +// Strings for the error codes above. +extern const char STUN_ERROR_REASON_TRY_ALTERNATE_SERVER[]; +extern const char STUN_ERROR_REASON_BAD_REQUEST[]; +extern const char STUN_ERROR_REASON_UNAUTHORIZED[]; +extern const char STUN_ERROR_REASON_UNKNOWN_ATTRIBUTE[]; +extern const char STUN_ERROR_REASON_STALE_NONCE[]; +extern const char STUN_ERROR_REASON_SERVER_ERROR[]; + +// The mask used to determine whether a STUN message is a request/response etc. +const uint32_t kStunTypeMask = 0x0110; + +// STUN Attribute header length. +const size_t kStunAttributeHeaderSize = 4; + +// Following values correspond to RFC5389. +const size_t kStunHeaderSize = 20; +const size_t kStunTransactionIdOffset = 8; +const size_t kStunTransactionIdLength = 12; +const uint32_t kStunMagicCookie = 0x2112A442; +constexpr size_t kStunMagicCookieLength = sizeof(kStunMagicCookie); + +// Following value corresponds to an earlier version of STUN from +// RFC3489. +const size_t kStunLegacyTransactionIdLength = 16; + +// STUN Message Integrity HMAC length. +const size_t kStunMessageIntegritySize = 20; +// Size of STUN_ATTR_MESSAGE_INTEGRITY_32 +const size_t kStunMessageIntegrity32Size = 4; + +class StunAddressAttribute; +class StunAttribute; +class StunByteStringAttribute; +class StunErrorCodeAttribute; +class StunUInt16ListAttribute; +class StunUInt32Attribute; +class StunUInt64Attribute; +class StunXorAddressAttribute; + +// Records a complete STUN/TURN message. Each message consists of a type and +// any number of attributes. Each attribute is parsed into an instance of an +// appropriate class (see above). The Get* methods will return instances of +// that attribute class. +class StunMessage { + public: + // Constructs a StunMessage with an invalid type and empty, legacy length + // (16 bytes, RFC3489) transaction id. + StunMessage(); + + // Construct a `StunMessage` with a specific type and generate a new + // 12 byte transaction id (RFC5389). + explicit StunMessage(uint16_t type); + + StunMessage(uint16_t type, absl::string_view transaction_id); + + virtual ~StunMessage(); + + // The verification status of the message. This is checked on parsing, + // or set by AddMessageIntegrity. + // These values are persisted to logs. Entries should not be renumbered and + // numeric values should never be reused. + enum class IntegrityStatus { + kNotSet = 0, + kNoIntegrity = 1, // Message-integrity attribute missing + kIntegrityOk = 2, // Message-integrity checked OK + kIntegrityBad = 3, // Message-integrity verification failed + kMaxValue = kIntegrityBad, + }; + + int type() const { return type_; } + size_t length() const { return length_; } + const std::string& transaction_id() const { return transaction_id_; } + uint32_t reduced_transaction_id() const { return reduced_transaction_id_; } + + // Returns true if the message confirms to RFC3489 rather than + // RFC5389. The main difference between the two versions of the STUN + // protocol is the presence of the magic cookie and different length + // of transaction ID. For outgoing packets the version of the protocol + // is determined by the lengths of the transaction ID. + bool IsLegacy() const; + + [[deprecated]] void SetType(int type) { type_ = static_cast<uint16_t>(type); } + [[deprecated]] bool SetTransactionID(absl::string_view transaction_id) { + if (!IsValidTransactionId(transaction_id)) + return false; + SetTransactionIdForTesting(transaction_id); + return true; + } + + // Get a list of all of the attribute types in the "comprehension required" + // range that were not recognized. + std::vector<uint16_t> GetNonComprehendedAttributes() const; + + // Gets the desired attribute value, or NULL if no such attribute type exists. + const StunAddressAttribute* GetAddress(int type) const; + const StunUInt32Attribute* GetUInt32(int type) const; + const StunUInt64Attribute* GetUInt64(int type) const; + const StunByteStringAttribute* GetByteString(int type) const; + const StunUInt16ListAttribute* GetUInt16List(int type) const; + + // Gets these specific attribute values. + const StunErrorCodeAttribute* GetErrorCode() const; + // Returns the code inside the error code attribute, if present, and + // STUN_ERROR_GLOBAL_FAILURE otherwise. + int GetErrorCodeValue() const; + const StunUInt16ListAttribute* GetUnknownAttributes() const; + + // Takes ownership of the specified attribute and adds it to the message. + void AddAttribute(std::unique_ptr<StunAttribute> attr); + + // Remove the last occurrence of an attribute. + std::unique_ptr<StunAttribute> RemoveAttribute(int type); + + // Remote all attributes and releases them. + void ClearAttributes(); + + // Validates that a STUN message has a correct MESSAGE-INTEGRITY value. + // This uses the buffered raw-format message stored by Read(). + IntegrityStatus ValidateMessageIntegrity(const std::string& password); + + // Revalidates the STUN message with (possibly) a new password. + // Indicates that calling logic needs review - probably previous call + // was checking with the wrong password. + IntegrityStatus RevalidateMessageIntegrity(const std::string& password); + + // Returns the current integrity status of the message. + IntegrityStatus integrity() const { return integrity_; } + + // Shortcut for checking if integrity is verified. + bool IntegrityOk() const { + return integrity_ == IntegrityStatus::kIntegrityOk; + } + + // Returns the password attribute used to set or check the integrity. + // Can only be called after adding or checking the integrity. + std::string password() const { + RTC_DCHECK(integrity_ != IntegrityStatus::kNotSet); + return password_; + } + + // Adds a MESSAGE-INTEGRITY attribute that is valid for the current message. + bool AddMessageIntegrity(absl::string_view password); + + // Adds a STUN_ATTR_GOOG_MESSAGE_INTEGRITY_32 attribute that is valid for the + // current message. + bool AddMessageIntegrity32(absl::string_view password); + + // Verify that a buffer has stun magic cookie and one of the specified + // methods. Note that it does not check for the existance of FINGERPRINT. + static bool IsStunMethod(rtc::ArrayView<int> methods, + const char* data, + size_t size); + + // Verifies that a given buffer is STUN by checking for a correct FINGERPRINT. + static bool ValidateFingerprint(const char* data, size_t size); + + // Generates a new 12 byte (RFC5389) transaction id. + static std::string GenerateTransactionId(); + + // Adds a FINGERPRINT attribute that is valid for the current message. + bool AddFingerprint(); + + // Parses the STUN packet in the given buffer and records it here. The + // return value indicates whether this was successful. + bool Read(rtc::ByteBufferReader* buf); + + // Writes this object into a STUN packet. The return value indicates whether + // this was successful. + bool Write(rtc::ByteBufferWriter* buf) const; + + // Creates an empty message. Overridable by derived classes. + virtual StunMessage* CreateNew() const; + + // Modify the stun magic cookie used for this STUN message. + // This is used for testing. + [[deprecated]] void SetStunMagicCookie(uint32_t val); + + // Change the internal transaction id. Used only for testing. + void SetTransactionIdForTesting(absl::string_view transaction_id); + + // Contruct a copy of `this`. + std::unique_ptr<StunMessage> Clone() const; + + // Check if the attributes of this StunMessage equals those of `other` + // for all attributes that `attribute_type_mask` return true + bool EqualAttributes(const StunMessage* other, + std::function<bool(int type)> attribute_type_mask) const; + + // Validates that a STUN message in byte buffer form + // has a correct MESSAGE-INTEGRITY value. + // These functions are not recommended and will be deprecated; use + // ValidateMessageIntegrity(password) on the parsed form instead. + [[deprecated("Use member function")]] static bool ValidateMessageIntegrity( + const char* data, + size_t size, + const std::string& password); + [[deprecated("Use member function")]] static bool ValidateMessageIntegrity32( + const char* data, + size_t size, + const std::string& password); + + // Expose raw-buffer ValidateMessageIntegrity function for testing. + static bool ValidateMessageIntegrityForTesting(const char* data, + size_t size, + const std::string& password); + // Expose raw-buffer ValidateMessageIntegrity function for testing. + static bool ValidateMessageIntegrity32ForTesting(const char* data, + size_t size, + const std::string& password); + + protected: + // Verifies that the given attribute is allowed for this message. + virtual StunAttributeValueType GetAttributeValueType(int type) const; + + std::vector<std::unique_ptr<StunAttribute>> attrs_; + + private: + StunAttribute* CreateAttribute(int type, size_t length) /* const*/; + const StunAttribute* GetAttribute(int type) const; + static bool IsValidTransactionId(absl::string_view transaction_id); + bool AddMessageIntegrityOfType(int mi_attr_type, + size_t mi_attr_size, + absl::string_view key); + static bool ValidateMessageIntegrityOfType(int mi_attr_type, + size_t mi_attr_size, + const char* data, + size_t size, + const std::string& password); + + uint16_t type_ = STUN_INVALID_MESSAGE_TYPE; + uint16_t length_ = 0; + std::string transaction_id_; + uint32_t reduced_transaction_id_ = 0; + uint32_t stun_magic_cookie_ = kStunMagicCookie; + // The original buffer for messages created by Read(). + std::string buffer_; + IntegrityStatus integrity_ = IntegrityStatus::kNotSet; + std::string password_; +}; + +// Base class for all STUN/TURN attributes. +class StunAttribute { + public: + virtual ~StunAttribute() {} + + int type() const { return type_; } + size_t length() const { return length_; } + + // Return the type of this attribute. + virtual StunAttributeValueType value_type() const = 0; + + // Only XorAddressAttribute needs this so far. + virtual void SetOwner(StunMessage* owner) {} + + // Reads the body (not the type or length) for this type of attribute from + // the given buffer. Return value is true if successful. + virtual bool Read(rtc::ByteBufferReader* buf) = 0; + + // Writes the body (not the type or length) to the given buffer. Return + // value is true if successful. + virtual bool Write(rtc::ByteBufferWriter* buf) const = 0; + + // Creates an attribute object with the given type and smallest length. + static StunAttribute* Create(StunAttributeValueType value_type, + uint16_t type, + uint16_t length, + StunMessage* owner); + // TODO(?): Allow these create functions to take parameters, to reduce + // the amount of work callers need to do to initialize attributes. + static std::unique_ptr<StunAddressAttribute> CreateAddress(uint16_t type); + static std::unique_ptr<StunXorAddressAttribute> CreateXorAddress( + uint16_t type); + static std::unique_ptr<StunUInt32Attribute> CreateUInt32(uint16_t type); + static std::unique_ptr<StunUInt64Attribute> CreateUInt64(uint16_t type); + static std::unique_ptr<StunByteStringAttribute> CreateByteString( + uint16_t type); + static std::unique_ptr<StunUInt16ListAttribute> CreateUInt16ListAttribute( + uint16_t type); + static std::unique_ptr<StunErrorCodeAttribute> CreateErrorCode(); + static std::unique_ptr<StunUInt16ListAttribute> CreateUnknownAttributes(); + + protected: + StunAttribute(uint16_t type, uint16_t length); + void SetLength(uint16_t length) { length_ = length; } + void WritePadding(rtc::ByteBufferWriter* buf) const; + void ConsumePadding(rtc::ByteBufferReader* buf) const; + + private: + uint16_t type_; + uint16_t length_; +}; + +// Implements STUN attributes that record an Internet address. +class StunAddressAttribute : public StunAttribute { + public: + static const uint16_t SIZE_UNDEF = 0; + static const uint16_t SIZE_IP4 = 8; + static const uint16_t SIZE_IP6 = 20; + StunAddressAttribute(uint16_t type, const rtc::SocketAddress& addr); + StunAddressAttribute(uint16_t type, uint16_t length); + + StunAttributeValueType value_type() const override; + + StunAddressFamily family() const { + switch (address_.ipaddr().family()) { + case AF_INET: + return STUN_ADDRESS_IPV4; + case AF_INET6: + return STUN_ADDRESS_IPV6; + } + return STUN_ADDRESS_UNDEF; + } + + const rtc::SocketAddress& GetAddress() const { return address_; } + const rtc::IPAddress& ipaddr() const { return address_.ipaddr(); } + uint16_t port() const { return address_.port(); } + + void SetAddress(const rtc::SocketAddress& addr) { + address_ = addr; + EnsureAddressLength(); + } + void SetIP(const rtc::IPAddress& ip) { + address_.SetIP(ip); + EnsureAddressLength(); + } + void SetPort(uint16_t port) { address_.SetPort(port); } + + bool Read(rtc::ByteBufferReader* buf) override; + bool Write(rtc::ByteBufferWriter* buf) const override; + + private: + void EnsureAddressLength() { + switch (family()) { + case STUN_ADDRESS_IPV4: { + SetLength(SIZE_IP4); + break; + } + case STUN_ADDRESS_IPV6: { + SetLength(SIZE_IP6); + break; + } + default: { + SetLength(SIZE_UNDEF); + break; + } + } + } + rtc::SocketAddress address_; +}; + +// Implements STUN attributes that record an Internet address. When encoded +// in a STUN message, the address contained in this attribute is XORed with the +// transaction ID of the message. +class StunXorAddressAttribute : public StunAddressAttribute { + public: + StunXorAddressAttribute(uint16_t type, const rtc::SocketAddress& addr); + StunXorAddressAttribute(uint16_t type, uint16_t length, StunMessage* owner); + + StunAttributeValueType value_type() const override; + void SetOwner(StunMessage* owner) override; + bool Read(rtc::ByteBufferReader* buf) override; + bool Write(rtc::ByteBufferWriter* buf) const override; + + private: + rtc::IPAddress GetXoredIP() const; + StunMessage* owner_; +}; + +// Implements STUN attributes that record a 32-bit integer. +class StunUInt32Attribute : public StunAttribute { + public: + static const uint16_t SIZE = 4; + StunUInt32Attribute(uint16_t type, uint32_t value); + explicit StunUInt32Attribute(uint16_t type); + + StunAttributeValueType value_type() const override; + + uint32_t value() const { return bits_; } + void SetValue(uint32_t bits) { bits_ = bits; } + + bool GetBit(size_t index) const; + void SetBit(size_t index, bool value); + + bool Read(rtc::ByteBufferReader* buf) override; + bool Write(rtc::ByteBufferWriter* buf) const override; + + private: + uint32_t bits_; +}; + +class StunUInt64Attribute : public StunAttribute { + public: + static const uint16_t SIZE = 8; + StunUInt64Attribute(uint16_t type, uint64_t value); + explicit StunUInt64Attribute(uint16_t type); + + StunAttributeValueType value_type() const override; + + uint64_t value() const { return bits_; } + void SetValue(uint64_t bits) { bits_ = bits; } + + bool Read(rtc::ByteBufferReader* buf) override; + bool Write(rtc::ByteBufferWriter* buf) const override; + + private: + uint64_t bits_; +}; + +// Implements STUN attributes that record an arbitrary byte string. +class StunByteStringAttribute : public StunAttribute { + public: + explicit StunByteStringAttribute(uint16_t type); + StunByteStringAttribute(uint16_t type, absl::string_view str); + StunByteStringAttribute(uint16_t type, const void* bytes, size_t length); + StunByteStringAttribute(uint16_t type, uint16_t length); + ~StunByteStringAttribute() override; + + StunAttributeValueType value_type() const override; + + const char* bytes() const { return bytes_; } + absl::string_view string_view() const { + return absl::string_view(bytes_, length()); + } + + [[deprecated]] std::string GetString() const { + return std::string(bytes_, length()); + } + + void CopyBytes(const void* bytes, size_t length); + void CopyBytes(absl::string_view bytes); + + uint8_t GetByte(size_t index) const; + void SetByte(size_t index, uint8_t value); + + bool Read(rtc::ByteBufferReader* buf) override; + bool Write(rtc::ByteBufferWriter* buf) const override; + + private: + void SetBytes(char* bytes, size_t length); + + char* bytes_; +}; + +// Implements STUN attributes that record an error code. +class StunErrorCodeAttribute : public StunAttribute { + public: + static const uint16_t MIN_SIZE; + StunErrorCodeAttribute(uint16_t type, int code, const std::string& reason); + StunErrorCodeAttribute(uint16_t type, uint16_t length); + ~StunErrorCodeAttribute() override; + + StunAttributeValueType value_type() const override; + + // The combined error and class, e.g. 0x400. + int code() const; + void SetCode(int code); + + // The individual error components. + int eclass() const { return class_; } + int number() const { return number_; } + const std::string& reason() const { return reason_; } + void SetClass(uint8_t eclass) { class_ = eclass; } + void SetNumber(uint8_t number) { number_ = number; } + void SetReason(const std::string& reason); + + bool Read(rtc::ByteBufferReader* buf) override; + bool Write(rtc::ByteBufferWriter* buf) const override; + + private: + uint8_t class_; + uint8_t number_; + std::string reason_; +}; + +// Implements STUN attributes that record a list of attribute names. +class StunUInt16ListAttribute : public StunAttribute { + public: + StunUInt16ListAttribute(uint16_t type, uint16_t length); + ~StunUInt16ListAttribute() override; + + StunAttributeValueType value_type() const override; + + size_t Size() const; + uint16_t GetType(int index) const; + void SetType(int index, uint16_t value); + void AddType(uint16_t value); + void AddTypeAtIndex(uint16_t index, uint16_t value); + + bool Read(rtc::ByteBufferReader* buf) override; + bool Write(rtc::ByteBufferWriter* buf) const override; + + private: + std::vector<uint16_t>* attr_types_; +}; + +// Return a string e.g "STUN BINDING request". +std::string StunMethodToString(int msg_type); + +// Returns the (successful) response type for the given request type. +// Returns -1 if `request_type` is not a valid request type. +int GetStunSuccessResponseType(int request_type); + +// Returns the error response type for the given request type. +// Returns -1 if `request_type` is not a valid request type. +int GetStunErrorResponseType(int request_type); + +// Returns whether a given message is a request type. +bool IsStunRequestType(int msg_type); + +// Returns whether a given message is an indication type. +bool IsStunIndicationType(int msg_type); + +// Returns whether a given response is a success type. +bool IsStunSuccessResponseType(int msg_type); + +// Returns whether a given response is an error type. +bool IsStunErrorResponseType(int msg_type); + +// Computes the STUN long-term credential hash. +bool ComputeStunCredentialHash(const std::string& username, + const std::string& realm, + const std::string& password, + std::string* hash); + +// Make a copy af `attribute` and return a new StunAttribute. +// This is useful if you don't care about what kind of attribute you +// are handling. +// +// The implementation copies by calling Write() followed by Read(). +// +// If `tmp_buffer` is supplied this buffer will be used, otherwise +// a buffer will created in the method. +std::unique_ptr<StunAttribute> CopyStunAttribute( + const StunAttribute& attribute, + rtc::ByteBufferWriter* tmp_buffer_ptr = 0); + +// TODO(?): Move the TURN/ICE stuff below out to separate files. +extern const char TURN_MAGIC_COOKIE_VALUE[4]; + +// "GTURN" STUN methods. +// TODO(?): Rename these methods to GTURN_ to make it clear they aren't +// part of standard STUN/TURN. +enum RelayMessageType { + // For now, using the same defs from TurnMessageType below. + // STUN_ALLOCATE_REQUEST = 0x0003, + // STUN_ALLOCATE_RESPONSE = 0x0103, + // STUN_ALLOCATE_ERROR_RESPONSE = 0x0113, + STUN_SEND_REQUEST = 0x0004, + STUN_SEND_RESPONSE = 0x0104, + STUN_SEND_ERROR_RESPONSE = 0x0114, + STUN_DATA_INDICATION = 0x0115, +}; + +// "GTURN"-specific STUN attributes. +// TODO(?): Rename these attributes to GTURN_ to avoid conflicts. +enum RelayAttributeType { + STUN_ATTR_LIFETIME = 0x000d, // UInt32 + STUN_ATTR_MAGIC_COOKIE = 0x000f, // ByteString, 4 bytes + STUN_ATTR_BANDWIDTH = 0x0010, // UInt32 + STUN_ATTR_DESTINATION_ADDRESS = 0x0011, // Address + STUN_ATTR_SOURCE_ADDRESS2 = 0x0012, // Address + STUN_ATTR_DATA = 0x0013, // ByteString + STUN_ATTR_OPTIONS = 0x8001, // UInt32 +}; + +// A "GTURN" STUN message. +class RelayMessage : public StunMessage { + public: + using StunMessage::StunMessage; + + protected: + StunAttributeValueType GetAttributeValueType(int type) const override; + StunMessage* CreateNew() const override; +}; + +// Defined in TURN RFC 5766. +enum TurnMessageType : uint16_t { + STUN_ALLOCATE_REQUEST = 0x0003, + STUN_ALLOCATE_RESPONSE = 0x0103, + STUN_ALLOCATE_ERROR_RESPONSE = 0x0113, + TURN_REFRESH_REQUEST = 0x0004, + TURN_REFRESH_RESPONSE = 0x0104, + TURN_REFRESH_ERROR_RESPONSE = 0x0114, + TURN_SEND_INDICATION = 0x0016, + TURN_DATA_INDICATION = 0x0017, + TURN_CREATE_PERMISSION_REQUEST = 0x0008, + TURN_CREATE_PERMISSION_RESPONSE = 0x0108, + TURN_CREATE_PERMISSION_ERROR_RESPONSE = 0x0118, + TURN_CHANNEL_BIND_REQUEST = 0x0009, + TURN_CHANNEL_BIND_RESPONSE = 0x0109, + TURN_CHANNEL_BIND_ERROR_RESPONSE = 0x0119, +}; + +enum TurnAttributeType { + STUN_ATTR_CHANNEL_NUMBER = 0x000C, // UInt32 + STUN_ATTR_TURN_LIFETIME = 0x000d, // UInt32 + STUN_ATTR_XOR_PEER_ADDRESS = 0x0012, // XorAddress + // TODO(mallinath) - Uncomment after RelayAttributes are renamed. + // STUN_ATTR_DATA = 0x0013, // ByteString + STUN_ATTR_XOR_RELAYED_ADDRESS = 0x0016, // XorAddress + STUN_ATTR_EVEN_PORT = 0x0018, // ByteString, 1 byte. + STUN_ATTR_REQUESTED_TRANSPORT = 0x0019, // UInt32 + STUN_ATTR_DONT_FRAGMENT = 0x001A, // No content, Length = 0 + STUN_ATTR_RESERVATION_TOKEN = 0x0022, // ByteString, 8 bytes. + // TODO(mallinath) - Rename STUN_ATTR_TURN_LIFETIME to STUN_ATTR_LIFETIME and + // STUN_ATTR_TURN_DATA to STUN_ATTR_DATA. Also rename RelayMessage attributes + // by appending G to attribute name. +}; + +// RFC 5766-defined errors. +enum TurnErrorType { + STUN_ERROR_FORBIDDEN = 403, + STUN_ERROR_ALLOCATION_MISMATCH = 437, + STUN_ERROR_WRONG_CREDENTIALS = 441, + STUN_ERROR_UNSUPPORTED_PROTOCOL = 442 +}; + +extern const int SERVER_NOT_REACHABLE_ERROR; + +extern const char STUN_ERROR_REASON_FORBIDDEN[]; +extern const char STUN_ERROR_REASON_ALLOCATION_MISMATCH[]; +extern const char STUN_ERROR_REASON_WRONG_CREDENTIALS[]; +extern const char STUN_ERROR_REASON_UNSUPPORTED_PROTOCOL[]; +class TurnMessage : public StunMessage { + public: + using StunMessage::StunMessage; + + protected: + StunAttributeValueType GetAttributeValueType(int type) const override; + StunMessage* CreateNew() const override; +}; + +enum IceAttributeType { + // RFC 5245 ICE STUN attributes. + STUN_ATTR_PRIORITY = 0x0024, // UInt32 + STUN_ATTR_USE_CANDIDATE = 0x0025, // No content, Length = 0 + STUN_ATTR_ICE_CONTROLLED = 0x8029, // UInt64 + STUN_ATTR_ICE_CONTROLLING = 0x802A, // UInt64 + // The following attributes are in the comprehension-optional range + // (0xC000-0xFFFF) and are not registered with IANA. These STUN attributes are + // intended for ICE and should NOT be used in generic use cases of STUN + // messages. + // + // Note that the value 0xC001 has already been assigned by IANA to + // ENF-FLOW-DESCRIPTION + // (https://www.iana.org/assignments/stun-parameters/stun-parameters.xml). + STUN_ATTR_NOMINATION = 0xC001, // UInt32 + // UInt32. The higher 16 bits are the network ID. The lower 16 bits are the + // network cost. + STUN_ATTR_GOOG_NETWORK_INFO = 0xC057, + // Experimental: Transaction ID of the last connectivity check received. + STUN_ATTR_GOOG_LAST_ICE_CHECK_RECEIVED = 0xC058, + // Uint16List. Miscellaneous attributes for future extension. + STUN_ATTR_GOOG_MISC_INFO = 0xC059, + // Obsolete. + STUN_ATTR_GOOG_OBSOLETE_1 = 0xC05A, + STUN_ATTR_GOOG_CONNECTION_ID = 0xC05B, // Not yet implemented. + STUN_ATTR_GOOG_DELTA = 0xC05C, // Not yet implemented. + STUN_ATTR_GOOG_DELTA_ACK = 0xC05D, // Not yet implemented. + // MESSAGE-INTEGRITY truncated to 32-bit. + STUN_ATTR_GOOG_MESSAGE_INTEGRITY_32 = 0xC060, +}; + +// When adding new attributes to STUN_ATTR_GOOG_MISC_INFO +// (which is a list of uint16_t), append the indices of these attributes below +// and do NOT change the existing indices. The indices of attributes must be +// consistent with those used in ConnectionRequest::Prepare when forming a STUN +// message for the ICE connectivity check, and they are used when parsing a +// received STUN message. +enum class IceGoogMiscInfoBindingRequestAttributeIndex { + SUPPORT_GOOG_PING_VERSION = 0, +}; + +enum class IceGoogMiscInfoBindingResponseAttributeIndex { + SUPPORT_GOOG_PING_VERSION = 0, +}; + +// RFC 5245-defined errors. +enum IceErrorCode { + STUN_ERROR_ROLE_CONFLICT = 487, +}; +extern const char STUN_ERROR_REASON_ROLE_CONFLICT[]; + +// A RFC 5245 ICE STUN message. +class IceMessage : public StunMessage { + public: + using StunMessage::StunMessage; + + protected: + StunAttributeValueType GetAttributeValueType(int type) const override; + StunMessage* CreateNew() const override; +}; + +} // namespace cricket + +#endif // API_TRANSPORT_STUN_H_ |