时间服务器小例子

blog 归档 网络编程 tcp/ip 例子

时间服务器小例子

#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
using namespace std;
int main()
{
    int serverSock = socket(AF_INET, SOCK_STREAM, 0);
    struct sockaddr_in serverAddr;
    bzero(&serverAddr, sizeof(struct sockaddr_in));
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
    serverAddr.sin_port = htons(13);
    bind(serverSock, (struct sockaddr*)&serverAddr, sizeof(serverAddr));
    listen(serverSock, 5);
    while (true)
    {
        struct sockaddr_in clientAddr;
        socklen_t len = sizeof(clientAddr);
        int clientSock = accept(serverSock, (struct sockaddr*)&clientAddr, &len);
        char ipbuf[INET_ADDRSTRLEN];
        printf("connection from %s, port %d\n", 
            inet_ntop(AF_INET, &clientAddr.sin_addr, ipbuf, sizeof(ipbuf)), 
            ntohs(clientAddr.sin_port));
        time_t t = time(NULL);
        char buf[1024];
        snprintf(buf, 1024, "%.24s\r\n", ctime(&t));
        write(clientSock, buf, strlen(buf));
        close(clientSock);
    }
    return 0;
}

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