web socket RFC6455 frame 打包、解包

最新推荐文章于 2021-10-27 03:09:50 发布

newzai

最新推荐文章于 2021-10-27 03:09:50 发布

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分类专栏： C/C++/VC 文章标签： c++ websocket

本文链接：https://blog.youkuaiyun.com/love_newzai/article/details/26003265

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本文主要探讨了WebSocket协议中RFC6455帧的打包和解包过程，重点关注在大部分环境中常见的payload_len不超过127的情况。在解包成功后，相关函数如get_head_len、get_total_len、get_payload_len能正确返回数据。当unpackage返回值大于0时，调用与长度相关的函数将被视为非法操作。

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#ifndef __APP_WEBSOCKET_FRAME_H__
#define __APP_WEBSOCKET_FRAME_H__
#include "memory.hpp"

class buffer;

struct websocket_frame
{
	websocket_frame();
	~websocket_frame();
	static const unsigned int fix_min_len = 2;
	static const unsigned int fix_masking_len = 4;
	static const unsigned int fix_126_len = 2;
	static const unsigned int fix_127_len = 8;
	bool fin;
	bool rsv1;
	bool rsv2;
	bool rsv3;
	unsigned char opcode;
	bool mask;
	unsigned char payload_len ;
	unsigned short payload_126_len;
	unsigned long long payload_127_len;
	unsigned char   masking_key[4];
	shared_ptr<buffer> payload;

	unsigned int get_head_len() const ;
	unsigned int get_total_len() const ;
	unsigned int get_payload_len() const ;
	//解包
	int unpakcage( const shared_ptr<buffer> & buf );

	//打包
	unsigned int package_size() ;
	shared_ptr<buffer> package() ;
protected:
	void set_masking_key( unsigned char * data, int offset);
	void get_masking_key( unsigned char * data, int offset);

};
#endif

#include "websocket_frame.hpp"
#include "buffer_pool.hpp"
#include <cstring>
#include <glog/logging.h>
#include <cstdlib>

websocket_frame::websocket_frame():fin(false)
,rsv1(false),rsv2(false),rsv3(false),mask(false),opcode(0)
,payload_len(0),payload_126_len(0),payload_127_l

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