firewall.cpl
,然后按回车键。这将打开Windows防火墙设置窗口,您可以在其中查看防火墙的状态。,,对于Linux系统,您可以使用以下命令之一来查看防火墙状态:,,1. 如果您使用的是ufw
(Uncomplicated Firewall),请输入sudo ufw status
。,2. 如果您使用的是iptables
,请输入sudo iptables -L
。,3. 如果您使用的是firewalld
,请输入sudo systemctl status firewalld
。c,#include,#include,#include,#include,#include,,int main() {, int server_fd, new_socket;, struct sockaddr_in address;, int addrlen = sizeof(address);,, if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {, perror("socket failed");, exit(EXIT_FAILURE);, },, address.sin_family = AF_INET;, address.sin_addr.s_addr = INADDR_ANY;, address.sin_port = htons(8080);,, if (bind(server_fd, (struct sockaddr *)&address, sizeof(address))< 0) {, perror("bind failed");, close(server_fd);, exit(EXIT_FAILURE);, },, if (listen(server_fd, 3)< 0) {, perror("listen failed");, close(server_fd);, exit(EXIT_FAILURE);, },, if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen))< 0) {, perror("accept failed");, close(server_fd);, exit(EXIT_FAILURE);, },, char buffer[1024] = {0};, read(new_socket, buffer, 1024);, printf("Message received: %s,", buffer);, send(new_socket, "Hello from server", strlen("Hello from server"), 0);,, close(new_socket);, close(server_fd);, return 0;,},
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