#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <arpa/inet.h> #include <sys/socket.h> #include <netinet/in.h> #define BUF_SIZE 1024 #define PORT 21 void send_command(int sock, char *cmd) { write(sock, cmd, strlen(cmd)); write(sock, "rn", 2); } void receive_response(int sock) { char buffer[BUF_SIZE]; int bytes_received; while ((bytes_received = read(sock, buffer, BUF_SIZE 1)) > 0) { buffer[bytes_received] = ' '; printf("%s", buffer); } } int main(int argc, char *argv[]) { if (argc != 3) { printf("Usage: %s <server IP> <username> ", argv[0]); exit(1); } int sock = socket(AF_INET, SOCK_STREAM, 0); if (sock == 1) { perror("socket"); exit(1); } struct sockaddr_in server_addr; memset(&server_addr, 0, sizeof(server_addr)); server_addr.sin_family = AF_INET; server_addr.sin_port = htons(PORT); inet_pton(AF_INET, argv[1], &server_addr.sin_addr); if (connect(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) == 1) { perror("connect"); exit(1); } receive_response(sock); // Read the welcome message from the server // Send user name char user_cmd[BUF_SIZE]; snprintf(user_cmd, BUF_SIZE, "USER %s", argv[2]); send_command(sock, user_cmd); receive_response(sock); // Send password (assuming an empty password for simplicity) send_command(sock, "PASS "); receive_response(sock); // List files in the current directory send_command(sock, "LIST"); receive_response(sock); // Close the connection close(sock); return 0; }
要编译并运行此代码,请将其保存为ftp_client.c
,然后使用以下命令:
gcc ftp_client.c o ftp_client ./ftp_client <server IP> <username>
这个示例仅支持匿名登录,并且没有实现完整的FTP协议,在实际应用中,您可能需要实现更多的功能,如上传、下载文件,以及处理更复杂的服务器响应。
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