Hi everyone, just wrote a simple piece of code to test the file upload resume using SFTP protocol. I'd like to contribute it for the example section of libcurl, should you found it useful.
Many thanks Sergio
/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2017, Daniel Stenberg, <[email protected]>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at https://curl.haxx.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ***************************************************************************/ /* <DESC> * Upload to FTP, resuming failed transfers. * </DESC> */ #include <stdlib.h> #include <stdio.h> #include <curl/curl.h> /* read data to upload */ static size_t readfunc(void *ptr, size_t size, size_t nmemb, void *stream) { FILE *f = static_cast<FILE*>(stream); size_t n; if(ferror(f)) return CURL_READFUNC_ABORT; n = fread(ptr, size, nmemb, f) * size; return n; } /*! * \brief sftpGetRemoteFileSize * \return the remote file size in byte; -1 on error */ static curl_off_t sftpGetRemoteFileSize(const char* i_remoteFile) { CURLcode r = CURLE_GOT_NOTHING; curl_off_t remoteFileSizeByte = -1; CURL* curlHandlePtr = NULL; curlHandlePtr = curl_easy_init(); curl_easy_setopt(curlHandlePtr, CURLOPT_VERBOSE, 1L); curl_easy_setopt(curlHandlePtr, CURLOPT_URL, i_remoteFile); curl_easy_setopt(curlHandlePtr, CURLOPT_NOPROGRESS, 1); curl_easy_setopt(curlHandlePtr, CURLOPT_NOBODY, 1); curl_easy_setopt(curlHandlePtr, CURLOPT_HEADER, 1); curl_easy_setopt(curlHandlePtr, CURLOPT_FILETIME, 1); r = curl_easy_perform(curlHandlePtr); if(CURLE_OK == r) { r = curl_easy_getinfo(curlHandlePtr, CURLINFO_CONTENT_LENGTH_DOWNLOAD_T, &remoteFileSizeByte); printf("filesize: %ld \n", remoteFileSizeByte); } curl_easy_cleanup(curlHandlePtr); return remoteFileSizeByte; } static int sftpResumeUpload(CURL *curlhandle, const char *remotepath, const char *localpath, long timeout) { FILE *f = NULL; CURLcode r = CURLE_GOT_NOTHING; curl_off_t remoteFileSizeByte = sftpGetRemoteFileSize( remotepath ); if (-1 == remoteFileSizeByte) { printf("Error reading the remote file size: unable to resume upload\n"); return -1; } f = fopen(localpath, "rb"); if(!f) { perror(NULL); return 0; } curl_easy_setopt(curlhandle, CURLOPT_UPLOAD, 1L); curl_easy_setopt(curlhandle, CURLOPT_URL, remotepath); if(timeout) curl_easy_setopt(curlhandle, CURLOPT_FTP_RESPONSE_TIMEOUT, timeout); curl_easy_setopt(curlhandle, CURLOPT_READFUNCTION, readfunc); curl_easy_setopt(curlhandle, CURLOPT_READDATA, f); fseek(f, remoteFileSizeByte, SEEK_SET); curl_easy_setopt(curlhandle, CURLOPT_APPEND, 1L); r = curl_easy_perform(curlhandle); fclose(f); if(r == CURLE_OK) return 1; else { fprintf(stderr, "%s\n", curl_easy_strerror(r)); return 0; } } int main(int argc, char** argv) { CURL *curlhandle = NULL; curl_global_init(CURL_GLOBAL_ALL); curlhandle = curl_easy_init(); printf("* using curl %s \n", curl_version()); const char* remote="sftp://user:[email protected]/path/filename";; const char* filename="filename"; int timeout = 0; sftpResumeUpload(curlhandle, remote, filename, timeout); curl_easy_cleanup(curlhandle); curl_global_cleanup(); return 0; }
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