互联网络程序设计实验实验

1、实验2 socket封装1.实验目标以C+类封装socket2.实验原理类继承体系：3.实验内容（1）socket表现为文件描述符将int socket作为类的成员，类向外暴露各种socket操作编写如下：class Socket private: int sin_size; int sockfd,new_fd; unsigned short port; struct sockaddr_in my_addr,their_addr,get_addr; public: Socket(); virtual Socket(); virtual int Socket(); void SetPort(un

2、signed short in_port); bool Bind(); void SetRemotePort(unsigned short in_port); unsigned short GetRemotePort(); / void GetRemoteAddrees(char *addrees); bool Connect(); void Listen(); void Accept(); int Send(const char *buf,int len); int Sendto(const char *buf,int len); int Recv(char *buf,int len); i

3、nt Recvfrom(char *buf,int len); void Close(); ; class TCP:public Socket public: int Socket(); bool Connect(); ; class UDP:public Socket public: int Socket(); ; class SCTP:public Socket public: int Socket(); bool Connect(); ; #endifsocket的类型很多AF_INETAF_INET6AF_LOCALSOCK_STREAMTCP|SCTPTCP|SCTPyesSOCK_

4、DGRAMUDPUDPyesSOCK_SEQPACKETSCTPSCTPyes以一种统一的形式封装各种不同类型的socket处理如下：/定义class TCP:public Socket public: int Socket(); bool Connect(); ; class UDP:public Socket public: int Socket(); ; class SCTP:public Socket public: int Socket(); bool Connect(); ; /函数int UDP:Socket() sockfd = socket(AF_INET ,SOCK_DGR

5、AM, 0); return sockfd; int TCP:Socket() sockfd = socket(AF_INET,SOCK_STREAM, 0); return sockfd; int SCTP:Socket() sockfd = socket(AF_INET,SOCK_SEQPAKET, 0); return sockfd; （2）考察socket的连接函数socket的地址族不一样，导致sockaddr结构是不一样的，虽然tcp/sctp这样的面向连接的协议可能都会有connect这样的函数，并且连接的动作都差不多，但是connect函数的servaddr参数是不一样的。如何

6、解决相似动作，但是参数类型不同？处理如下：bool TCP:Connect() if(connect(sockfd,(struct sockaddr *)&their_addr, sizeof(struct sockaddr)=-1) return false; return true; bool SCTP:Connect() if(connect(sockfd,(const struct sockaddr *)&their_addr, sizeof(struct sockaddr)=-1) return false; return true; 附录1socket.h#ifndefSOCKET

7、_H #defineSOCKET_H #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std;class Socket private: int sin_size; int sockfd,new_fd; unsigned short port; struct sockaddr_in my_addr,their_addr,get

8、_addr; public: Socket(); virtual Socket(); virtual int Socket(); void SetPort(unsigned short in_port); bool Bind(); void SetRemotePort(unsigned short in_port); unsigned short GetRemotePort(); / void GetRemoteAddrees(char *addrees); bool Connect(); void Listen(); void Accept(); int Send(const char *b

9、uf,int len); int Sendto(const char *buf,int len); int Recv(char *buf,int len); int Recvfrom(char *buf,int len); void Close(); ; class TCP:public Socket public: int Socket(); bool Connect(); ; class UDP:public Socket public: int Socket(); ; class SCTP:public Socket public: int Socket(); bool Connect(

10、); ; #endif 附录2socket.cpp#include server.hSocket:Socket() Socket:Socket() Close(); int UDP:Socket() sockfd = socket(AF_INET ,SOCK_DGRAM, 0); return sockfd; int TCP:Socket() sockfd = socket(AF_INET,SOCK_STREAM, 0); return sockfd; int SCTP:Socket() sockfd = socket(AF_INET,SOCK_SEQPAKET, 0); return soc

11、kfd; int Socket:Socket() sockfd = socket(AF_INET,SOCK_STREAM, 0); return sockfd; void Socket:SetPort(unsigned short in_port) struct hostent *host;host=gethostbyname(192.168.0.225);my_addr.sin_family = AF_INET; port = in_port; my_addr.sin_port = htons(port); my_addr.sin_addr = *(struct in_addr *)host

12、-h_addr);bzero(&(my_addr.sin_zero),8); void Socket:SetRemotePort(unsigned short in_port) their_addr.sin_port=htons(in_port); unsigned short Socket:GetRemotePort() return ntohs(get_addr.sin_port); bool Socket:Bind() if(bind(sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr)=-1) perror(bind er

13、rn);return false; return true; int Socket:Recvfrom(char *buf,int len) int numbytes; socklen_t addr_len = sizeof(get_addr); numbytes = recvfrom(sockfd,buf,len,0,(struct sockaddr *)&get_addr,&addr_len); if(numbytes = -1) return false; bufnumbytes = 0; return numbytes; int Socket:Sendto(const char *buf

14、,int len) return sendto(sockfd,buf,len,0,(struct sockaddr *)&their_addr,sizeof(struct sockaddr); void Socket:Close() close(sockfd); close(new_fd); void Socket:Listen() if(listen(sockfd,10)=-1) coutlisten err!n; void Socket:Accept() socklen_t size = sizeof(struct sockaddr_in); new_fd = accept(sockfd,(struct sockaddr *)&get_addr,&size); if(new_fd=-1) perror(accept err!n); exit(1); int Socket:Recv(char *buf,int len) return recv(new_fd,buf,len,0); int Socket:Send(const char * buf, int len) return send(new_fd,buf,len,0); bool TCP:Connect() if(