TCP和UDP的网络搭建

TCP服务器

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<sys/socket.h>
#include<sys/types.h>  
#include<unistd.h> 
#include <netinet/in.h>
#include <arpa/inet.h>
#define ERR_MSG(msg)do{\
	fprintf(stderr,"line;__%d__ %s %s\n",__LINE__,__FILE__,__func__);\
	perror(msg);\
}while(0)
#define IP "192.168.2.15"
#define PORT 6666

int main(int argc, const char *argv[])
{
//创建流式套接字
	int sfd  = socket(AF_INET,SOCK_STREAM,0);
	if(sfd < 0)
	{
		ERR_MSG("socket");
		return -1;
	}
	//端口快速被使用
	int reuse = 1;
	if( setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse)) < 0)
	{
		ERR_MSG("setsockopt");
		return -1;
	
	}



	//绑定服务器的IP和端口号
	struct sockaddr_in sin;
	sin.sin_family = AF_INET; 				//必须填AF_INET
	sin.sin_port = htons(PORT); 			//服务器的端口号，网络字节序
	sin.sin_addr.s_addr = inet_addr(IP);   	//服务器的IP，网络字节
	if (bind(sfd,(struct sockaddr *)&sin,sizeof(sin)) < 0)
	{
		ERR_MSG("bind");
		return -1;
	}
	printf("bind success __%d__\n",__LINE__);
	
	//把套接字变为监听模式
	if (listen(sfd,128) < 0)
	{
		ERR_MSG("listen"); 
		return -1;
	 
	}
	printf("listen success __%d__\n",__LINE__);


	//连接成功后获得新套接字的描述符
	struct sockaddr_in cin; 			//存储客户端的地址结构体
	socklen_t addrlen = sizeof(cin);    //地址结构体的大小
	int newfd = accept(sfd,(struct sockaddr*)&cin,&addrlen);
	if (newfd < 0)
	{
		ERR_MSG("accept");
		return -1;
	}
	printf("[%s:%d]客户端连接成功 newfd=%d  __%d__\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd,__LINE__);
	char b[32];
	char c[32];
	ssize_t res = 0;
	while (1)
	{   //接收
		bzero(b,sizeof(b));
		 res = recv (newfd,b,sizeof(b),0);
		 if (0 == res)
		 {
		 printf("[%s;%d]客户端已经下线 newfd=%d __%d__\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd,__LINE__);
		 }
		if (res < 0)
		{
			ERR_MSG("recv");
			return -1;
		}
		printf("[%s;%d]%s __%d__\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port), b,__LINE__);
		
		//发送
		bzero(c,sizeof(c));
		scanf("%s",c);
		if(send (newfd,c,sizeof(c),0) < 0)
		{
			ERR_MSG("send");
			return -1;
		}
	
	
	}
		//关闭套接字
		close(sfd);
		close(newfd);
	return 0;
}

TCP客户端

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<sys/socket.h>
#include<sys/types.h>  
#include<unistd.h> 
#include <netinet/in.h>
#include <arpa/inet.h>
#define ERR_MSG(msg)do{\
	fprintf(stderr,"line;__%d__ %s %s\n",__LINE__,__FILE__,__func__);\
	perror(msg);\
}while(0)
#define IP "192.168.2.15"
#define PORT 6666

int main(int argc, const char *argv[])
{
//创建流式套接字
	int cfd  = socket(AF_INET,SOCK_STREAM,0);
	if(cfd < 0)
	{
		ERR_MSG("socket");
		return -1;
	}


	//非必要绑定服务器的IP和端口号

	//connect连接服务器
	struct sockaddr_in cin;
	cin.sin_family = AF_INET;
	cin.sin_port = htons(PORT);
	cin.sin_addr.s_addr = inet_addr(IP);
	if (connect(cfd,(struct sockaddr*)&cin,sizeof(cin)) < 0)
	{
		ERR_MSG("connect");
		return -1;
	}

	printf("[%s:%d]服务器连接成功   __%d__\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),__LINE__);
	char b[32];
	char c[32];
	ssize_t res = 0;
	while (1)
	{   //发送
		bzero(c,sizeof(c));
		scanf("%s",c);
		if(send (cfd,c,sizeof(c),0) < 0)
		{
			ERR_MSG("send");
			return -1;
		}
	
		// 接收
		bzero(b,sizeof(b));
		 res = recv (cfd,b,sizeof(b),0);
		 if (0 == res)
		 {
		 printf("[%s;%d]服务器已经下线  __%d__\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),__LINE__);
		 }
		if (res < 0)
		{
			ERR_MSG("recv");
			return -1;
		}
		printf("[%s;%d]%s __%d__\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port), b,__LINE__);
		
	
	}
		//关闭套接字
		close(cfd);
	
	return 0;
}

UDP服务器

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/types.h>  
#include<unistd.h>




#define ERR_MSG(msg)do{\
	fprintf(stderr,"line:__%d__ %s  %s\n",__LINE__,__FILE__,__func__);\
	perror(msg);\
}while(0)
#define IP "192.168.2.15"
#define PORT 6666

int main(int argc, const char *argv[])
{
	//创建流式套接字
	int sfd = socket(AF_INET,SOCK_DGRAM,0);
		if (sfd < 0)
		{
			ERR_MSG("socket");
			return -1;
		}
	//绑定端口号和IP
	struct sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(PORT);
	sin.sin_addr.s_addr = inet_addr(IP);
	if ( bind(sfd,(struct sockaddr*)&sin,sizeof(sin)) < 0 )
	{
		ERR_MSG("bind");
		return -1;
	}	
	printf("bind success __%d__\n",__LINE__);	
	
	char b[32];
	char c[32];
	ssize_t res = 0;
	struct sockaddr_in cfd;
	socklen_t addrlen = sizeof(cfd);

	while (1)
	{  //接收
		bzero(b,sizeof(b));
		 res = recvfrom(sfd,b,sizeof(b),0,(struct sockaddr *)&cfd,&addrlen);
		if(res < 0)
		{
			ERR_MSG("recvfrom");
			return -1;
		
		}
		printf("[%s:%d]%s  __%d__ \n",inet_ntoa(cfd.sin_addr),ntohs(cfd.sin_port),b,__LINE__);
		//发送
		bzero(c,sizeof(c));
		scanf("%s",c);
		 if(sendto(sfd,c,sizeof(c),0,(struct sockaddr *)&cfd,addrlen) < 0)
	
		{
			ERR_MSG("sendto");
			return -1;
		
		}
		printf("sendto success __%d__ \n",__LINE__);
	
	}
	
	//关闭流式套接字
	close (sfd);
	return 0;
}

UDP客户端

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/types.h>  
#include<unistd.h>




#define ERR_MSG(msg)do{\
	fprintf(stderr,"line:__%d__ %s  %s\n",__LINE__,__FILE__,__func__);\
	perror(msg);\
}while(0)
#define IP "192.168.2.15"
#define PORT 6666

int main(int argc, const char *argv[])
{
	//创建流式套接字
	int cfd = socket(AF_INET,SOCK_DGRAM,0);
		if (cfd < 0)
		{
			ERR_MSG("socket");
			return -1;
		}
	//非不要绑定端口号和IP

	
	char b[32];
	char c[32];
	ssize_t res = 0;
	struct sockaddr_in sfd;
	sfd.sin_family = AF_INET;
	sfd.sin_port = htons(PORT);
	sfd.sin_addr.s_addr = inet_addr(IP);
	socklen_t addrlen = sizeof(sfd);

	while (1)
	{  	//发送
		bzero(c,sizeof(c));
		scanf("%s",c);
		 if(sendto(cfd,c,sizeof(c),0,(struct sockaddr *)&sfd,addrlen) < 0)
	
		{
			ERR_MSG("sendto");
			return -1;
		
		}
		printf("sendto success __%d__ \n",__LINE__);

		//接收
		bzero(b,sizeof(b));
		 res = recvfrom(cfd,b,sizeof(b),0,(struct sockaddr *)&sfd,&addrlen);
		if(res < 0)
		{
			ERR_MSG("recvfrom");
			return -1;
		
		}
		printf("[%s:%d]%s  __%d__ \n",inet_ntoa(sfd.sin_addr),ntohs(sfd.sin_port),b,__LINE__);
	
	}
	
	//关闭流式套接字
	close (cfd);
	return 0;
}

UDP实现