11.12TCP、UDP的基础模型

最新推荐文章于 2025-12-07 23:18:44 发布

原创最新推荐文章于 2025-12-07 23:18:44 发布 · 160 阅读

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#tcp/ip #udp #网络协议

TCP服务器

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

#define SER_PORT 8888
#define SER_IP "192.168.124.39"

int main(int argc, const char *argv[])
{
	int sfd = socket(AF_INET,SOCK_STREAM,0);
	if(sfd <0){
		fprintf(stderr,"__%d__",__LINE__);
		perror("socket");
		return -1;
	}
	printf("socket success__%d__\n",__LINE__);
	
	int reuse =1;
	if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse))<0){
		fprintf(stderr, "__%d__",__LINE__);
		perror("setsockopt");
		return -1;
	}
	printf("reuseaddr success__%d__\n",__LINE__);

	int port = argc>=2?atoi(argv[1]):SER_PORT;

	struct sockaddr_in sin;
	sin.sin_family = AF_INET;                  
	sin.sin_port   = htons(port);              
	sin.sin_addr.s_addr   = inet_addr(SER_IP); 
                                              				
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))<0){
		fprintf(stderr,"__%d__",__LINE__);
		perror("bind");
		return -1;
	}
	printf("bind success __%d__\n",__LINE__);

	if(listen(sfd,128) <0){
		fprintf(stderr,"__%d__",__LINE__);
		perror("listen");
		return -1;
	}
	printf("listen success __%d__\n",__LINE__);

	struct sockaddr_in cin;                     
	socklen_t addrlen = sizeof(cin);

	//accept(sfd,NULL,NULL);                    
	int newfd = accept(sfd,(struct sockaddr*)&cin,&addrlen);
	if(newfd <0){
		fprintf(stderr,"__%d__",__LINE__);
		perror("accept");
		return -1;
	}
	printf("client connect success,[%s,%d],newfd = %d__%d__\n",\
			inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd,__LINE__);

	char buf[128] = "";
	ssize_t res = 0;
	while(1){
		bzero(buf,sizeof(buf));     //memset(buf, 0, sizeof(buf));

		res = recv(newfd, buf, sizeof(buf), 0);
		if(res <0){
			fprintf(stderr,"__%d__",__LINE__);
			perror("recv");
			return -1;
		}
		else if(0 ==res){
			printf("client [%s,%d]  offline __%d__\n",\
					inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),__LINE__);
			break;
		}

		printf("[%s,%d] newfd = %d:%s\n",\
				inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd,buf);

		strcat(buf,"*_*");
		res = send(newfd, buf, sizeof(buf),0);
		if(res <0){
			fprintf(stderr,"__%d__",__LINE__);
			perror("send");
			return -1;
		}	
		printf("send success,__%d__\n",__LINE__);
	}

	close(newfd);
	close(sfd);
	return 0;
}

TCP客户端

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

#define SER_PORT 8888
#define SER_IP "192.168.124.39"

int main(int argc, const char *argv[])
{
	int cfd = socket(AF_INET,SOCK_STREAM,0);
	if(cfd <0){
		fprintf(stderr,"__%d__",__LINE__);
		perror("socket");
		return -1;
	}
	printf("socket success__%d__\n",__LINE__);

	int port = argc>=2?atoi(argv[1]):SER_PORT;
	
	struct sockaddr_in sin;
	sin.sin_family = AF_INET;                  //必须填AF_INET
	sin.sin_port   = htons(port);              //服务器绑定的端口号
	sin.sin_addr.s_addr   = inet_addr(SER_IP); //服务器绑定的IP
                                             										   
	if(connect(cfd, (struct sockaddr*)&sin,sizeof(sin))<0){
		fprintf(stderr,"__%d__",__LINE__);
		perror("connect");
		return -1;
	}
	printf("connnect server success __%d__\n",__LINE__);
	
	char buf[128] = "";
	ssize_t res = 0;
	while(1){

		printf("请输入>>>");
		fgets(buf,sizeof(buf), stdin);     
		buf[strlen(buf)-1] ='\0';          
		
		res = send(cfd, buf, sizeof(buf),0);
		if(res <0){
			fprintf(stderr,"__%d__",__LINE__);
			perror("send");
			return -1;
		}	
		printf("send success,__%d__\n",__LINE__);
		
		bzero(buf,sizeof(buf));

		res = recv(cfd, buf, sizeof(buf), 0);
		if(res <0){
			fprintf(stderr,"__%d__",__LINE__);
			perror("recv");
			return -1;
		}
		else if(0 ==res){
			printf("server [%s,%d]  offline __%d__\n",\
					SER_IP,SER_PORT,__LINE__);
			break;
		}
		printf("get server msg: cfd = %d:%s\n",cfd,buf);
	}
	close(cfd);
	return 0;
}

结果展示：

UDP服务器

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

#define SER_PORT 8888
#define SER_IP "192.168.124.39"

int main(int argc ,const char *argv[])
{
	int sfd = socket(AF_INET,SOCK_DGRAM, 0);
	if(sfd <0){
		fprintf(stderr,"__%d__",__LINE__);
		perror("socket");
		return -1;
	}
	printf("socket success__%d__",__LINE__);
	
	int reuse =1;
	if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse))<0){
		fprintf(stderr, "__%d__",__LINE__);
		perror("setsockopt");
		return -1;
	}
	printf("reuseaddr success__%d__\n",__LINE__);

	int port = argc>=2?atoi(argv[1]):SER_PORT;

	struct sockaddr_in sin;
	sin.sin_family = AF_INET;                  
	sin.sin_port   = htons(port);             
	sin.sin_addr.s_addr   = inet_addr(SER_IP); 
                                             
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))<0){
		fprintf(stderr,"__%d__",__LINE__);
		perror("bind");
		return -1;
	}
	printf("bind success __%d__\n",__LINE__);
	
	struct sockaddr_in cin;		
	socklen_t addrlen = sizeof(cin);
	
	char buf[128] = "";
	ssize_t res = 0;
	while(1){
		bzero(buf,sizeof(buf));     //memset(buf, 0, sizeof(buf));

		res = recvfrom(sfd, buf, sizeof(buf),0,(struct sockaddr*)&cin,&addrlen);
	
		if(res <0){
			fprintf(stderr,"__%d__",__LINE__);
			perror("recvfrom");
			return -1;
		}

		printf("[%s,%d] newfd = %d:%s\n",\
				inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),sfd,buf);

		strcat(buf,"*_*");
		res = sendto(sfd, buf, sizeof(buf),0 ,(struct stockaddr*)&cin,sizeof(cin));
		if(res <0){
			fprintf(stderr,"__%d__",__LINE__);
			perror("sendto");
			return -1;
		}	
		printf("send success,__%d__\n",__LINE__);
	} 
	close(sfd);
	
	return 0;
}

UDP客户端

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

#define SER_PORT 8888
#define SER_IP "192.168.124.39"

int main(int argc ,const char *argv[])
{
	int sfd = socket(AF_INET,SOCK_DGRAM, 0);
	if(sfd <0){
		fprintf(stderr,"__%d__",__LINE__);
		perror("socket");
		return -1;
	}
	printf("socket success__%d__i\n",__LINE__);
	
	int port = argc>=2?atoi(argv[1]):SER_PORT;

	struct sockaddr_in sin;
	sin.sin_family = AF_INET;                 
	sin.sin_port   = htons(port);             
	sin.sin_addr.s_addr   = inet_addr(SER_IP); 

	struct sockaddr_in cin;		
	socklen_t addrlen = sizeof(cin);
	
	char buf[128] = "";
	ssize_t res = 0;
	while(1){

		printf("请输入>>>");
		fgets(buf, sizeof(buf), stdin);
		buf[strlen(buf)-1]='\0';
		
		res = sendto(sfd, buf, sizeof(buf),0 ,(struct sockaddr*)&sin,sizeof(sin));
		if(res <0){
			fprintf(stderr,"__%d__",__LINE__);
			perror("sendto");
			return -1;
		}	
		printf("send success,__%d__\n",__LINE__);
		
		bzero(buf,sizeof(buf));     //memset(buf, 0, sizeof(buf));

		res = recvfrom(sfd, buf, sizeof(buf),0,(struct sockaddr*)&cin,&addrlen);
		if(res <0){
			fprintf(stderr,"__%d__",__LINE__);
			perror("recvfrom");
			return -1;
		}

		printf("[%s,%d] newfd = %d:%s\n",\
				inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),sfd,buf);
	} 
	close(sfd);
	
	return 0;
}

结果展示：