UNIX网络编程练习-简单的时间服务器和客户端

// 客户端程序
// DATE: 2015.11.30
// AUTH: robertkun

#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <string.h>
#include <unistd.h>

using namespace std;

typedef sockaddr SA;

int main(int argc, char* argv[])
{
	if(argc != 2) {
		cerr<<"ip not define!"<<endl;
		return 0;
	}

	// 创建套接字
	int sockfd = socket(AF_INET, SOCK_STREAM, 0);
	if(sockfd < 0)
		cerr<<"socket init error!"<<endl;

	// 初始化地址
	struct sockaddr_in addr;
	bzero(&addr, sizeof(addr));
	addr.sin_family = AF_INET;
	addr.sin_port = htons(6543);

	// 装字符串转换成网络地址
	if(inet_pton(AF_INET, argv[1], &addr.sin_addr) <= 0) {
		cerr<<"addr error!"<<endl;
		return 0;
	}
	
	// 连接服务器
	if(connect(sockfd, (SA *)&addr, sizeof(addr)) < 0) {
		cerr<<"connect error!"<<endl;
		return 0;
	}

	// 读取数据
	int n = 0;
	char buff[256] = {0};
	while((n = read(sockfd, buff, 256)) > 0)
	{
		buff
 = 0;
		cout<<buff<<endl;
	}

	if(n < 0) {
		cerr<<"read error!"<<endl;
		return 0;
	}

	return 1;
}

// 服务端程序
// DATE: 2015.11.30
// AUTH: robertkun

#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>

#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <errno.h>

using namespace std;

typedef struct sockaddr SA;

int main()
{
	char buff[256] = {0};

	// 创建TCP套接字
	int _fd = socket(AF_INET, SOCK_STREAM, 0);
	
	// 绑定端口到套接字
	struct sockaddr_in addr;
	bzero(&addr, sizeof(addr));
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = htonl(INADDR_ANY);
	addr.sin_port = htons(6543);
	
	if(bind(_fd, (SA *)&addr, sizeof(addr)) != 0) {
		cerr<<"bind error!"<<errno<<endl;
		return -1;
	}

	// 打开监听
	if(listen(_fd, 256) != 0) {
		cerr<<"listen error!"<<endl;
		return -1;
	}

	// 等待连接
	while(1)
	{
		int _connfd = accept(_fd, (SA *)NULL, NULL);
		if(_connfd)
			cout<<"accept ok"<<endl;

		time_t ticks = time(NULL);
		snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks));
		write(_connfd, buff, strlen(buff));
	
		// 终止连接
		close(_connfd);
	}

	return 0;
}