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#ifndef SRC_NODE_CRYPTO_CLIENTHELLO_H_
#define SRC_NODE_CRYPTO_CLIENTHELLO_H_
#include "node.h"
#include <stddef.h> // size_t
#include <stdlib.h> // nullptr
namespace node {
class ClientHelloParser {
public:
ClientHelloParser() : state_(kEnded),
onhello_cb_(nullptr),
onend_cb_(nullptr),
cb_arg_(nullptr),
session_size_(0),
session_id_(nullptr),
servername_size_(0),
servername_(nullptr),
ocsp_request_(0),
tls_ticket_size_(0),
tls_ticket_(nullptr) {
Reset();
}
class ClientHello {
public:
inline uint8_t session_size() const { return session_size_; }
inline const uint8_t* session_id() const { return session_id_; }
inline bool has_ticket() const { return has_ticket_; }
inline uint8_t servername_size() const { return servername_size_; }
inline const uint8_t* servername() const { return servername_; }
inline int ocsp_request() const { return ocsp_request_; }
private:
uint8_t session_size_;
const uint8_t* session_id_;
bool has_ticket_;
uint8_t servername_size_;
const uint8_t* servername_;
int ocsp_request_;
friend class ClientHelloParser;
};
typedef void (*OnHelloCb)(void* arg, const ClientHello& hello);
typedef void (*OnEndCb)(void* arg);
void Parse(const uint8_t* data, size_t avail);
inline void Reset();
inline void Start(OnHelloCb onhello_cb, OnEndCb onend_cb, void* onend_arg);
inline void End();
inline bool IsPaused() const;
inline bool IsEnded() const;
private:
static const size_t kMaxTLSFrameLen = 16 * 1024 + 5;
static const size_t kMaxSSLExFrameLen = 32 * 1024;
static const uint8_t kServernameHostname = 0;
static const uint8_t kStatusRequestOCSP = 1;
static const size_t kMinStatusRequestSize = 5;
enum ParseState {
kWaiting,
kTLSHeader,
kPaused,
kEnded
};
enum FrameType {
kChangeCipherSpec = 20,
kAlert = 21,
kHandshake = 22,
kApplicationData = 23,
kOther = 255
};
enum HandshakeType {
kClientHello = 1
};
enum ExtensionType {
kServerName = 0,
kStatusRequest = 5,
kTLSSessionTicket = 35
};
bool ParseRecordHeader(const uint8_t* data, size_t avail);
void ParseHeader(const uint8_t* data, size_t avail);
void ParseExtension(ExtensionType type,
const uint8_t* data,
size_t len);
bool ParseTLSClientHello(const uint8_t* data, size_t avail);
ParseState state_;
OnHelloCb onhello_cb_;
OnEndCb onend_cb_;
void* cb_arg_;
size_t frame_len_;
size_t body_offset_;
size_t extension_offset_;
uint8_t session_size_;
const uint8_t* session_id_;
uint16_t servername_size_;
const uint8_t* servername_;
uint8_t ocsp_request_;
uint16_t tls_ticket_size_;
const uint8_t* tls_ticket_;
};
} // namespace node
#endif // SRC_NODE_CRYPTO_CLIENTHELLO_H_