socket通信的基本流程

最新推荐文章于 2022-11-28 21:51:24 发布

原创最新推荐文章于 2022-11-28 21:51:24 发布 · 置顶 · 946 阅读

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文章标签：

#c语言 #socket #通信 #基本原理 #代码

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这篇博客主要介绍了使用C语言实现的Socket通信过程，包括面向连接的服务器和客户机，以及面向无连接的服务器和客户机的代码实现。内容侧重于实践操作，作为TCP-IP理论知识的补充。

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写在前面：

本博客内容主要为socket通信的C语言实现，与TCP-IP分类下的文章为对应互补内容。

由于理论知识已在对应内容中有所介绍，因此本博客中主要是代码实现：

1.面向连接的服务器：

#include <winsock.h>
#pragma comment(lib,"wsock32.lib")
int main(int argc, char* argv[])
{
	SOCKET s,newsock;
	sockaddr_in ser_addr;
	sockaddr_in remote_addr;
	int len;
	char buf[128];
	WSAData wsa;

	WSAStartup(0x101,&wsa);
	s = socket(AF_INET,SOCK_STREAM,0);
	ser_addr.sin_family = AF_INET;
	ser_addr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
	ser_addr.sin_port = htons(0x1234);
	
	bind(s,(sockaddr*)&ser_addr,sizeof(ser_addr));

	listen(s,0);
	while(1){
		len = sizeof(remote_addr);
		newsock = accept(s,(sockaddr*)&remote_addr,&len);
		recv(newsock,buf,sizeof(buf),0);
		send(newsock,"ACK",3,0);
		closesocket(newsock);
	}
	closesocket(s);
	WSACleanup();
	return 0;
}

2.面向连接的客户机：

#include <winsock.h>
#pragma comment(lib,"wsock32.lib")
int main(int argc, char* argv[])
{
	SOCKET s;
	sockaddr_in local,server;
	WSAData wsa;
	char *buf = "I am a client";
	char recvbuf[128];

	WSAStartup(0x101,&wsa);

	s = socket(AF_INET,SOCK_STREAM,0);
	local.sin_family = AF_INET;
	local.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
	local.sin_port = htons(0x3412);
	
	bind(s,(sockaddr*)&local,sizeof(local));

	server.sin_family = AF_INET;
	server.sin_addr.S_un.S_addr = htonl(INADDR_LOOPBACK);
	server.sin_port = htons(0x1234);
	
	connect(s,(sockaddr*)&server,sizeof(server));
	
	send(s,buf,strlen(buf),0);
	recv(s,recvbuf,sizeof(recvbuf),0);
	closesocket(s);
	WSACleanup();
	return 0;
}

3.面向无连接的服务器：

#include <winsock.h>
#pragma comment(lib,"wsock32.lib")
int main(int argc, char* argv[])
{
	SOCKET s;
	sockaddr_in local;
	sockaddr_in remote;
	int len;
	char buf[128];
	WSAData wsa;

	WSAStartup(0x101,&wsa);
	s = socket(AF_INET,SOCK_DGRAM,0);
	
	local.sin_family = AF_INET;
	local.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
	local.sin_addr.S_un.S_un_b = 9;
	local.sin_port = htons(0x1234);

	bind(s,(sockaddr*)&local,sizeof(local));
	while(1){
		len = sizeof(remote);
		recvfrom(s,buf,sizeof(buf),0,(sockaddr*)&remote,&len);
		len = sizeof(remote);
		sendto(s,"ACK",3,0,(sockaddr*)&remote,len);

	}
	closesocket(s);
	WSACleanup();
	return 0;
}

4.面向无连接的客户机：

#include <winsock.h>
#pragma comment(lib,"wsock32.lib")
int main(int argc, char* argv[])
{
	int len;
	char *sndbuf = "I am a cl client";
	char recvbuf[128];
	WSAData wsa;

	WSAStartup(0x101,&wsa);
	s = socket(     );
	
	local.sin_family = AF_INET;
	local.sin_addr.S_un.S_addr = htonl(    );
	local.sin_port = htons(    );

	bind(  ,     ,sizeof(local));
	
	remote.sin_family = AF_INET;
	remote.sin_addr.S_un.S_addr = htonl(    );
	remote.sin_port = htons(    );

	len = sizeof(remote);
	sendto(  ,sndbuf,16,0,    ,len);

	len = sizeof(remote);
	recvfrom(   ,recvbuf,sizeof(recvbuf),0,     ,&len);

	closesocket(   );
	WSACleanup();
	return 0;
}