帮我写一段c语言在Linux下基于libssh的sftp登录和下载文件代码
时间: 2023-03-29 22:03:33 浏览: 108
好的,以下是基于libssh的sftp登录和下载文件的C语言代码:
```
#include <stdio.h>
#include <stdlib.h>
#include <libssh/libssh.h>
#include <libssh/sftp.h>
int main(int argc, char *argv[]) {
ssh_session session;
sftp_session sftp;
int rc;
// 创建ssh会话
session = ssh_new();
if (session == NULL) {
fprintf(stderr, "Error creating ssh session.\n");
exit(EXIT_FAILURE);
}
// 设置ssh连接参数
ssh_options_set(session, SSH_OPTIONS_HOST, "hostname");
ssh_options_set(session, SSH_OPTIONS_USER, "username");
ssh_options_set(session, SSH_OPTIONS_PORT, &port);
// 连接ssh服务器
rc = ssh_connect(session);
if (rc != SSH_OK) {
fprintf(stderr, "Error connecting to ssh server: %s\n", ssh_get_error(session));
ssh_free(session);
exit(EXIT_FAILURE);
}
// 认证
rc = ssh_userauth_password(session, NULL, "password");
if (rc != SSH_AUTH_SUCCESS) {
fprintf(stderr, "Error authenticating with password: %s\n", ssh_get_error(session));
ssh_disconnect(session);
ssh_free(session);
exit(EXIT_FAILURE);
}
// 创建sftp会话
sftp = sftp_new(session);
if (sftp == NULL) {
fprintf(stderr, "Error creating sftp session: %s\n", ssh_get_error(session));
ssh_disconnect(session);
ssh_free(session);
exit(EXIT_FAILURE);
}
// 初始化sftp会话
rc = sftp_init(sftp);
if (rc != SSH_OK) {
fprintf(stderr, "Error initializing sftp session: %s\n", ssh_get_error(session));
sftp_free(sftp);
ssh_disconnect(session);
ssh_free(session);
exit(EXIT_FAILURE);
}
// 下载文件
sftp_file file;
char buffer[1024];
int nbytes;
file = sftp_open(sftp, "/remote/file/path", O_RDONLY, );
if (file == NULL) {
fprintf(stderr, "Error opening remote file: %s\n", ssh_get_error(session));
sftp_free(sftp);
ssh_disconnect(session);
ssh_free(session);
exit(EXIT_FAILURE);
}
FILE *local_file = fopen("/local/file/path", "w");
if (local_file == NULL) {
fprintf(stderr, "Error opening local file.\n");
sftp_close(file);
sftp_free(sftp);
ssh_disconnect(session);
ssh_free(session);
exit(EXIT_FAILURE);
}
while ((nbytes = sftp_read(file, buffer, sizeof(buffer))) > ) {
fwrite(buffer, 1, nbytes, local_file);
}
fclose(local_file);
sftp_close(file);
sftp_free(sftp);
ssh_disconnect(session);
ssh_free(session);
return ;
}
```