最简单的FTP客户端、服务器端

来源：互联网发布：讲解spring源码的书籍编辑：程序博客网时间：2024/05/22 03:03

/*使用Socket 通信实现 FTP 服务器端 程序*/#include "unp.h"#include <sys/socket.h>#define SA  struct sockaddrint main(int argc, char *argv[]){int sock_fd, new_fd;struct sockaddr_in        server_addr, client_addr;int sin_size, portnumber;char hello[] = "您已建立连接！！\n";if(argc != 2){printf("usage: %s <portnumber>\n",argv[0]);}if((portnumber = atoi(argv[1])) < 0){printf("usage: %s <portnumber>\n",argv[0]);}//服务器端建立socket描述符if((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0){printf("socket error\n");}//填充sockaddr结构bzero(&server_addr, sizeof(server_addr));server_addr.sin_family = AF_INET;server_addr.sin_addr.s_addr = htonl(INADDR_ANY);server_addr.sin_port = htons(portnumber);//捆绑socket描述符if(bind(sock_fd, (SA *)(&server_addr), sizeof(server_addr)) == -1){printf("bind error\n");}//监听sock_fd描述符if(listen(sock_fd, 5) == -1){printf("listen error\n");}for(;;){//服务器阻塞，直到客户端程序建立连接sin_size = sizeof(struct sockaddr_in);if((new_fd = accept(sock_fd,(SA *)(&client_addr), &sin_size)) == -1){printf("accept error\n");}printf("server get connect from %s\n",inet_ntoa(client_addr.sin_addr));if(write(new_fd, hello, strlen(hello)) == -1){printf("write error\n");}//这个通讯已经结束close(new_fd);//循环等待下一个}close(sock_fd);exit(0);}

/*socket 实现 FTP 客户端*/#include "unp.h"#include <sys/socket.h>#define MAXSIZE 1024#define SA struct sockaddrint main(int argc, char *argv[]){int sock_fd;char buffer[MAXSIZE];struct sockaddr_in         server_addr;struct hostent        *host;int portnumber, nbytes;if(argc != 3){printf("usage: %s hostname portnumber\a\n", argv[0]);}if((host = gethostbyname(argv[1])) == NULL){printf("get hostname error\n");}if((portnumber = atoi(argv[2])) < 0){printf("usage: %s hostname portnumber\a\n", argv[0]);}//客户程序建立sock_fd描述符if((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1){printf("socket error");}//客户程序填充服务器端的资料bzero(&server_addr, sizeof(server_addr));server_addr.sin_family = AF_INET;server_addr.sin_port = htons(portnumber);server_addr.sin_addr = *((struct in_addr *)host->h_addr);//客户程序发起连接请求if(connect(sock_fd, (SA *)(&server_addr), sizeof(server_addr)) < 0){printf("connect error\a\n");}//连接成功if((nbytes = read(sock_fd, buffer, 1024)) == -1){printf("read error\n");}buffer[nbytes] = '\0';printf("I have received: %s\n", buffer);//结束通信close(sock_fd);exit(0);}

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