74 lines
2.0 KiB
C++
74 lines
2.0 KiB
C++
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#include <iostream>
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#include <cstring>
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//#include <cstdlib>
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#include <unistd.h>
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#include <netdb.h>
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//#include <sys/types.h>
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//#include <sys/socket.h>
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//#include <arpa/inet.h>
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using namespace std;
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int handling(char *buffer) { // 数据处理函数
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if(strcmp(buffer, "off\n") == 0) {
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cout << "服务端指令关闭服务器" << endl; return -1;
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}
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cout << "成功接收" << endl << buffer << endl;
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return 0;
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}
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int main(int argc, char *argv[]) {
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if(argc != 2) {
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cout << "参数不正确" << endl; return -1;
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}
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// 创建服务端socket
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int listenfd = socket(AF_INET, SOCK_STREAM, 0);
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if(listenfd == -1) {
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cout << "socket创建失败" << endl; return -1;
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}
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// 向客户端请求连接
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struct sockaddr_in servaddr;
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memset(&servaddr, 0, sizeof(servaddr));
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servaddr.sin_family = AF_INET;
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servaddr.sin_addr.s_addr = htons(INADDR_ANY);
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servaddr.sin_port = htons(atoi(argv[1])); //指定连接端口
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// 绑定服务端IP及端口
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if(bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) != 0) {
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cout << "端口未成功绑定" << endl; close(listenfd); return -1;
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}
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// 把端口设为监听
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if(listen(listenfd, 5) != 0) {
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cout << "端口无法监听" << endl; close(listenfd); return -1;
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}
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// 受理客户端连接请求, accept()阻塞等待
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int clistenfd;
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while(true) {
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clistenfd = accept(listenfd, 0, 0);
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if(clistenfd == -1) {
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cout << "未正常受理连接" << endl; close(listenfd); return -1;
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}
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cout << "客户端已连接" << endl;
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//与客户端通信
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char buffer[1024];
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memset(buffer, 0, sizeof(buffer));
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if(recv(clistenfd, buffer, sizeof(buffer), 0) <= 0) { // 接受服务端报文
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cout << "客户端连接已断开" << endl; break;
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}
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if(handling(buffer) == -1) break; //对接受数据进行处理
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// 发送回应报文
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strcpy(buffer, "OK");
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if(send(clistenfd, buffer, strlen(buffer), 0) <= 0) {
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cout << "发送回应报文失败" << endl; break;
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}
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}
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//关闭连接
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close(clistenfd);
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close(listenfd);
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return 0;
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}
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