TCP/IP套接字编程示例-优快云博客

本文链接：https://blog.youkuaiyun.com/2201_76096626/article/details/130045323

#include<stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<unistd.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<string.h>
 
#define ERR_MSG(msg) do{\
	fprintf(stderr,"liine %d",__LINE__);\
	perror(msg);\
}while(0)
 
#define IP "192.168.8.77"  //本机IP 
#define PORT 6666          // 1024-49151
 
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;
	}
	printf("sfd=%d\n",sfd);
	//允许端口快速重用
	int reuse=1;
	if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))<0)
	{
		ERR_MSG("setsockopt");
		return -1;
	}
 
	//填充地址信息结构体
	//真是的地址信息结构体根据地址族制定  AF_INET: man 7 ip
	struct sockaddr_in sin;
	sin.sin_family = AF_INET;//必须填 AF_INET
	sin.sin_port = htons(PORT);//端口号, 1024-49151
	sin.sin_addr.s_addr = inet_addr(IP);//本机IP,ifconfig
 
	//将IP和端口号绑定到套接字上
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))<0)
	{
		ERR_MSG("bind");
		return -1;
	}
	printf("bind sucess __%d__\n",__LINE__);
 
	//将套接字设置为被动监听状态,监听是否有客户端连接成功
	if(listen(sfd,128)<0)
	{
		ERR_MSG("listen");
		return -1;
	}
	printf("listen success __%d__\n",__LINE__);
 
	struct sockaddr_in cin;        // 存储连接成功的客户端地址信息  
	socklen_t addrlen = sizeof(cin);
 
	//阻塞函数，从已完成连接的队列头中获取一个客户端信息
	//该文件描述符才是与客户端通信的文件描述符
	int newfd=accept(sfd,(struct sockaddr*)&cin,&addrlen);
	if(newfd<0)
	{
		ERR_MSG("accept");
		return -1;
	}
	printf("[%s:%d] newfd=%d 连接成功 __%d__\n",\
			inet_ntoa(cin.sin_addr),ntohs(cin.sin_port), newfd,__LINE__);
 
	char buf[128]="";
	ssize_t res=0;
	while(1)
	{
		//接收
	
		res=recv(newfd,buf,sizeof(buf),0);
		if(res<0)
		{
			ERR_MSG("recv");
			return -1;
		}
		else if(0==res)
		{
			printf("[%s:%d] newfd=%d 连接成功 __%d__\n",\
			inet_ntoa(cin.sin_addr),ntohs(cin.sin_port), newfd,__LINE__);
			break;
		}
		printf("[%s:%d] newfd=%d 连接成功 __%d__\n",\
			inet_ntoa(cin.sin_addr),ntohs(cin.sin_port), newfd,__LINE__);
 
		//发送
		strcat(buf,"*_*");
		if(send(newfd,buf,sizeof(buf),0)<0)
		{
			ERR_MSG("send");
			return -1;
		}
		printf("send sucess\n");
	}
	close(newfd);
	close(sfd);
	return 0;
}

#include<stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<unistd.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<string.h>
 
#define ERR_MSG(msg) do{\
	fprintf(stderr,"liine %d",__LINE__);\
	perror(msg);\
}while(0)
 
#define IP "192.168.8.77"  //本机IP 
#define PORT 6666          // 1024-49151
 
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;
	}
	printf("cfd=%d\n",cfd);
	//允许端口快速重用
	int reuse=1;
	if(setsockopt(cfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))<0)
	{
		ERR_MSG("setsockopt");
		return -1;
	}
 
	//填充地址信息结构体
	//真是的地址信息结构体根据地址族制定  AF_INET: man 7 ip
	struct sockaddr_in sin;
	sin.sin_family = AF_INET;//必须填 AF_INET
	sin.sin_port = htons(PORT);//端口号, 1024-49151
	sin.sin_addr.s_addr = inet_addr(IP);//本机IP,ifconfig
	
	//连接服务器
	if(connect(cfd,(struct sockaddr*)&sin,sizeof(sin))<0)
	{
		ERR_MSG("connet");
		return -1;
	}
	printf("connect  sucess __%d__\n",__LINE__);
 
	char buf[128]="";
	ssize_t res=0;
	while(1)
	{
		bzero(buf,sizeof(buf));
		printf("请输入数据>>>");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]=0;
 
		//发送
		if(send(cfd,buf,sizeof(buf),0)<0)
		{
			ERR_MSG("send");
			return -1;
		}
		printf("send sucess\n");
 
		//接收
		bzero(buf,sizeof(buf));
		
		res=recv(cfd,buf,sizeof(buf),0);
		if(res<0)
		{
			ERR_MSG("recv");
			return -1;
		}
		else if(0==res)
		{
			printf("cfd=%d 服务器下线 __%d__\n",	cfd,__LINE__);
			break;
		}
		printf("cfd=%d %s __%d__\n",cfd,buf,__LINE__);
 
	}
	close(cfd);
	return 0;
}

#include<stdio.h>
#include<sys/types.h>
#include<unistd.h>
#include<netinet/in.h>
#include<sys/stat.h>
#include<netinet/in.h>
#include<string.h>
#include<sys/socket.h>
#include<arpa/inet.h>
 
#define ERR_MSG(msg) do{\
	fprintf(stderr,"line%d",__LINE__);\
	perror(msg);\
}while(0)
 
#define IP "192.168.8.77" //本机IP 
#define PORT 6666
 
int main(int argc, const char *argv[])
{
	//创建报式套接字
	int sfd = socket(AF_INET, SOCK_DGRAM,0);
	if(sfd<0)
	{
		ERR_MSG("socket");
		return -1;
	}
	//填充服务器的地址信息结构体
	struct sockaddr_in sin;
	sin.sin_family  = AF_INET;      //必须填AF_INET
	sin.sin_port = htons(PORT);     //端口号的网络字节符
	sin.sin_addr.s_addr = inet_addr(IP);
 
	//绑定 必须绑定
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))<0)
	{
		ERR_MSG("bind");
		return -1;
	}
 
	struct sockaddr_in cin;//存储数据包是从哪里来的
	socklen_t addrlen = sizeof(cin);
 
	char buf[128]="";
	ssize_t res =0;
	while(1)
	{
		bzero(buf,sizeof(buf));
		//接收数据，必须接收数据包的发送方地址信息
		res=recvfrom(sfd,buf,sizeof(buf),0,(struct sockaddr*)&cin,&addrlen);
		if(res<0)
		{
			ERR_MSG("recvfrom");
			return -1;
		}
		printf("[%s : %d]: %s\n",inet_ntoa(cin.sin_addr), ntohs(cin.sin_port),buf);
		
		strcat(buf,"*_*");
		if(sendto(sfd,buf,sizeof(buf),0,(struct sockaddr*)&cin,sizeof(cin))<0)
		{
			ERR_MSG("sendto");
			return -1;
		}
	}
	//关闭文件描述符
	close(sfd);
	return 0;
}

#include<stdio.h>
#include<sys/types.h>
#include<unistd.h>
#include<netinet/in.h>
#include<sys/stat.h>
#include<netinet/in.h>
#include<string.h>
#include<sys/socket.h>
#include<arpa/inet.h>
 
#define ERR_MSG(msg) do{\
	fprintf(stderr,"line%d",__LINE__);\
	perror(msg);\
}while(0)
 
#define SER_IP "192.168.8.77" //本机IP 
#define SER_PORT 6666
 
#define CLI_IP "192.168.8.77" //本机IP 
#define CLI_PORT 8888
 
int main(int argc, const char *argv[])
{
	//创建报式套接字
	int cfd = socket(AF_INET, SOCK_DGRAM,0);
	if(cfd<0)
	{
		ERR_MSG("socket");
		return -1;
	}
 
	struct sockaddr_in cin;
	cin.sin_family  = AF_INET;      //必须填AF_INET
	cin.sin_port = htons(CLI_PORT);     //端口号的网络字节符
	cin.sin_addr.s_addr = inet_addr(CLI_IP);
	
	if(bind(cfd,(struct sockaddr*)&cin,sizeof(cin))<0)
	{
		ERR_MSG("bind");
		return -1;
	}
	printf("client bind success\n");
 
	//填充服务器的地址信息结构体
	struct sockaddr_in sin;
	sin.sin_family  = AF_INET;      //必须填AF_INET
	sin.sin_port = htons(SER_PORT);     //端口号的网络字节符
	sin.sin_addr.s_addr = inet_addr(SER_IP);
 
	struct sockaddr_in rcvaddr;//存储数据包是从哪里来的
	socklen_t addrlen = sizeof(rcvaddr);
 
	char buf[128]="";
	ssize_t res =0;
	while(1)
	{
		bzero(buf,sizeof(buf));
		printf("请输入数据");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]=0;
		//发送数据，发送给服务器
		if(sendto(cfd,buf,sizeof(buf),0,(struct sockaddr*)&sin,sizeof(sin))<0)
		{
			ERR_MSG("sendto");
			return -1;
		}
 
		//接收数据，必须接收数据包的发送方地址信息
		res=recvfrom(cfd,buf,sizeof(buf),0,(struct sockaddr*)&rcvaddr,&addrlen);
		if(res<0)
		{
			ERR_MSG("recvfrom");
			return -1;
		}
		printf("[%s : %d]: %s\n",inet_ntoa(cin.sin_addr), ntohs(cin.sin_port),buf);
	}
	//关闭文件描述符
	close(cfd);
	return 0;
}

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