138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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/* <DESC>
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* Upload to SFTP, resuming a previously aborted transfer.
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* </DESC>
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <curl/curl.h>
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/* read data to upload */
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static size_t readfunc(char *ptr, size_t size, size_t nmemb, void *stream)
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{
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FILE *f = (FILE *)stream;
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size_t n;
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if(ferror(f))
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return CURL_READFUNC_ABORT;
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n = fread(ptr, size, nmemb, f) * size;
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return n;
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}
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/*
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* sftpGetRemoteFileSize returns the remote file size in byte; -1 on error
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*/
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static curl_off_t sftpGetRemoteFileSize(const char *i_remoteFile)
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{
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CURLcode result = CURLE_GOT_NOTHING;
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curl_off_t remoteFileSizeByte = -1;
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CURL *curlHandlePtr = curl_easy_init();
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curl_easy_setopt(curlHandlePtr, CURLOPT_VERBOSE, 1L);
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curl_easy_setopt(curlHandlePtr, CURLOPT_URL, i_remoteFile);
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curl_easy_setopt(curlHandlePtr, CURLOPT_NOPROGRESS, 1);
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curl_easy_setopt(curlHandlePtr, CURLOPT_NOBODY, 1);
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curl_easy_setopt(curlHandlePtr, CURLOPT_HEADER, 1);
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curl_easy_setopt(curlHandlePtr, CURLOPT_FILETIME, 1);
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result = curl_easy_perform(curlHandlePtr);
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if(CURLE_OK == result) {
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result = curl_easy_getinfo(curlHandlePtr,
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CURLINFO_CONTENT_LENGTH_DOWNLOAD_T,
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&remoteFileSizeByte);
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if(result)
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return -1;
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printf("filesize: %lu\n", (unsigned long)remoteFileSizeByte);
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}
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curl_easy_cleanup(curlHandlePtr);
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return remoteFileSizeByte;
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}
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static int sftpResumeUpload(CURL *curlhandle, const char *remotepath,
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const char *localpath)
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{
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FILE *f = NULL;
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CURLcode result = CURLE_GOT_NOTHING;
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curl_off_t remoteFileSizeByte = sftpGetRemoteFileSize(remotepath);
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if(-1 == remoteFileSizeByte) {
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printf("Error reading the remote file size: unable to resume upload\n");
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return -1;
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}
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f = fopen(localpath, "rb");
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if(!f) {
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perror(NULL);
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return 0;
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}
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curl_easy_setopt(curlhandle, CURLOPT_UPLOAD, 1L);
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curl_easy_setopt(curlhandle, CURLOPT_URL, remotepath);
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curl_easy_setopt(curlhandle, CURLOPT_READFUNCTION, readfunc);
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curl_easy_setopt(curlhandle, CURLOPT_READDATA, f);
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#ifdef _WIN32
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_fseeki64(f, remoteFileSizeByte, SEEK_SET);
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#else
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fseek(f, (long)remoteFileSizeByte, SEEK_SET);
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#endif
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curl_easy_setopt(curlhandle, CURLOPT_APPEND, 1L);
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result = curl_easy_perform(curlhandle);
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fclose(f);
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if(result == CURLE_OK)
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return 1;
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else {
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fprintf(stderr, "%s\n", curl_easy_strerror(result));
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return 0;
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}
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}
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int main(void)
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{
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const char *remote = "sftp://user:pass@example.com/path/filename";
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const char *filename = "filename";
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CURL *curlhandle = NULL;
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curl_global_init(CURL_GLOBAL_ALL);
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curlhandle = curl_easy_init();
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if(!sftpResumeUpload(curlhandle, remote, filename)) {
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printf("resumed upload using curl %s failed\n", curl_version());
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}
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curl_easy_cleanup(curlhandle);
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curl_global_cleanup();
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return 0;
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}
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