在没有实际传输的情况下在libcurl中执行SFTP / FTP命令 [英] Executing SFTP/FTP command in libcurl without actual transfer

问题描述

我使用CURLOPT_QUOTE设置要执行的命令（实际上是文件删除），但是在执行后执行操作（并且它成功执行，文件被删除）curl试图上传或下载文件（基于CURLOPT_UPLOAD），所以我得到CURLE_REMOTE_FILE_NOT_FOUND错误错误代码。

到目前为止我尝试过的 - 没有设置URL导致格式错误的URL错误，设置CURLOPT_CONNECT_ONLY导致报价不被执行。有没有标准的方法？

  curl_global_init（CURL_GLOBAL_DEFAULT）; 
 
 char temp [2000]; 
 _snprintf（STRPARAM（temp），％s：//％s：％d /％s，sftp，m_url，m_port，a_ftpPath）; 
 curl_easy_setopt（m_curl，CURLOPT_URL，temp）; 
 _snprintf（STRPARAM（temp），％s：％s，m_name，m_pass）; 
 curl_easy_setopt（m_curl，CURLOPT_USERPWD，temp）; 
 curl_easy_setopt（m_curl，CURLOPT_SSH_AUTH_TYPES，CURLSSH_AUTH_PASSWORD）; 
 
 curl_easy_setopt（m_curl，CURLOPT_UPLOAD，0L）; 
 curl_easy_setopt（m_curl，CURLOPT_READFUNCTION，NULL）; 
 curl_easy_setopt（m_curl，CURLOPT_NOBODY，1L）; 
 curl_easy_setopt（m_curl，CURLOPT_HEADER，1L）; 
 
 struct curl_slist * headerlist = NULL; 
 _snprintf（STRPARAM（temp），rm /％s，a_ftpPath）; 
 headerlist = curl_slist_append（headerlist，temp）; 
 curl_easy_setopt（m_curl，CURLOPT_QUOTE，headerlist）; 
 
 m_res = curl_easy_perform（m_curl）; 
 
 curl_easy_setopt（m_curl，CURLOPT_QUOTE，NULL）; 
 curl_easy_setopt（m_curl，CURLOPT_HEADER，0L）; 
 curl_easy_setopt（m_curl，CURLOPT_NOBODY，0L）; 
 curl_slist_free_all（headerlist）; 
 
 curl_global_cleanup（）; 
  

解决方案

CURLOPT_NOBODY 是要求没有身体转移的关键。

Is it possible to execute SFTP command in libcurl without actual attempt of file transfer.

I set the command to execute (file deletion actually) using CURLOPT_QUOTE, but after executing the operation (and it executes successfully, file is deleted) curl is trying to upload or download file (based on CURLOPT_UPLOAD), so I get the CURLE_REMOTE_FILE_NOT_FOUND error error code.

What I tried so far - not setting the URL results in "malformed url error", setting CURLOPT_CONNECT_ONLY result in quote not executed as well. Is there any standard way?

curl_global_init(CURL_GLOBAL_DEFAULT);

char temp[2000];
_snprintf(STRPARAM(temp),"%s://%s:%d/%s","sftp",m_url,m_port,a_ftpPath);
curl_easy_setopt(m_curl, CURLOPT_URL,temp);
_snprintf(STRPARAM(temp),"%s:%s",m_name,m_pass);
curl_easy_setopt(m_curl, CURLOPT_USERPWD, temp);
curl_easy_setopt(m_curl, CURLOPT_SSH_AUTH_TYPES, CURLSSH_AUTH_PASSWORD);

curl_easy_setopt(m_curl, CURLOPT_UPLOAD, 0L);
curl_easy_setopt(m_curl, CURLOPT_READFUNCTION, NULL);
curl_easy_setopt(m_curl, CURLOPT_NOBODY, 1L);
curl_easy_setopt(m_curl, CURLOPT_HEADER, 1L);

struct curl_slist *headerlist=NULL;
_snprintf(STRPARAM(temp),"rm /%s",a_ftpPath);
headerlist = curl_slist_append(headerlist, temp);
curl_easy_setopt(m_curl, CURLOPT_QUOTE, headerlist); 

m_res = curl_easy_perform(m_curl);

curl_easy_setopt(m_curl, CURLOPT_QUOTE, NULL); 
curl_easy_setopt(m_curl, CURLOPT_HEADER, 0L);
curl_easy_setopt(m_curl, CURLOPT_NOBODY, 0L);
curl_slist_free_all (headerlist);

curl_global_cleanup();

解决方案

CURLOPT_NOBODY is the key for asking that no "body" is to get transferred.

这篇关于在没有实际传输的情况下在libcurl中执行SFTP / FTP命令的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！