Linux网络编程之TCP/IP

导读：基于TCP/IP协议的服务器端与客户端的实现。  

1.服务器端

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

int main(int argc,const char* argv[])
{
	int sockfd  = 0;
	sockfd = socket(AF_INET,SOCK_STREAM,0);
	if(sockfd == -1)
	{
		perror("socket");
		exit(1);

	}
	else
	{
		printf("sockfd:%dn",sockfd);
		//bind
		int flag = 0;
		struct sockaddr_in ser;
		bzero(&ser,sizeof(ser));
		socklen_t len = sizeof(ser);

		ser.sin_family  = AF_INET;
		ser.sin_port = htons(atoi(argv[2]));
		ser.sin_addr.s_addr = inet_addr(argv[1]);

		flag = bind(sockfd,(struct sockaddr*)&ser,len);
		if(flag == -1)
		{
			perror("bind");
			exit(1);
		}
		else
		{
			//listen 
			int retval = 0;
			retval = listen(sockfd,10);
			if(retval == -1)
			{
				perror("listen");
				exit(1);
			}
			else
			{
				puts("-------init success ,ready go!!!!-----");

			}
			int accfd = 0;
			struct sockaddr_in cli;
			bzero(&cli,sizeof(cli));
			accfd = accept(sockfd,(struct sockaddr*)&cli,&len);
			printf("[%s-%d]online lalalalan",
					inet_ntoa(cli.sin_addr),
					ntohs(cli.sin_port));
			if(accfd == -1)
			{
				perror("accept");
				exit(1);
			}
			else
			{
				printf("accfd:%dn",accfd);
				ssize_t rd = 0;
				while(1)
				{
					char buf[100] = {0};

					rd = read(accfd,buf,sizeof(buf));
					if(rd == -1)
					{
						perror("read");
						exit(1);
					}
					else if(rd == 0)
					{
						printf("exit!n");
						break;
					}
					else
					{
						printf("[%s-%d]%sn",
								inet_ntoa(cli.sin_addr),
								ntohs(cli.sin_port),buf);
					}
				}
			}
		}
	}
	return 0;
}

2.客户端 

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

int main(int argc,const char* argv[])
{
	// create socket
	int sockfd = socket(AF_INET,SOCK_STREAM,0);
	if(sockfd == -1)
	{
		perror("socket");
		exit(1);

	}

	// connect server
	struct sockaddr_in ser;
	bzero(&ser,sizeof(ser));
	socklen_t len = sizeof(ser);
	ser.sin_family = AF_INET;
	ser.sin_port = htons(atoi(argv[2]));
	ser.sin_addr.s_addr = inet_addr(argv[1]);

	int flag = connect(sockfd,(struct sockaddr*)&ser,len);
	if(flag == -1)
	{
		perror("connect");
		exit(1);
	}

	char buf[128] = {0};
	ssize_t rcv = 0;
	while(1)
	{
		//send message to server
		bzero(buf,sizeof(buf));
		printf("Input send to server:");
		scanf("%s",buf);
		while(getchar() != 'n');
		rcv = write(sockfd,buf,strlen(buf));
		if(rcv == -1)
		{
			perror("write");
			exit(1);
		}
		else
		{
			printf("send success!n");
		}

		// receive message from server
		printf("是否接收来自服务器的消息（y/n）:");
		while(1)
		{
			char ch = 0;
			scanf("%c",&ch);
			while(getchar() != 'n');
			if(ch == 'y')
			{
				bzero(buf,sizeof(buf));
				rcv = read(sockfd,buf,sizeof(buf));
				if(rcv == -1)
				{
					perror("read");
					exit(1);
				}
				else
				{
					printf("from server:%sn",buf);
					break;
				}
			}
			else if(ch == 'n')
			{
				break;
			}
			else
			{
				printf("输入错误，请输入y/n:");
			}
		}
	}
	return 0;
}