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+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, 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 SFTP, resuming a previously aborted transfer.
+ * </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 = (FILE *)stream;
+ size_t n;
+
+ if(ferror(f))
+ return CURL_READFUNC_ABORT;
+
+ n = fread(ptr, size, nmemb, f) * size;
+
+ return n;
+}
+
+/*
+ * sftpGetRemoteFileSize returns the remote file size in byte; -1 on error
+ */
+static curl_off_t sftpGetRemoteFileSize(const char *i_remoteFile)
+{
+ CURLcode result = 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);
+
+ result = curl_easy_perform(curlHandlePtr);
+ if(CURLE_OK == result) {
+ result = 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)
+{
+ FILE *f = NULL;
+ CURLcode result = 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);
+ 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);
+ result = curl_easy_perform(curlhandle);
+
+ fclose(f);
+
+ if(result == CURLE_OK)
+ return 1;
+ else {
+ fprintf(stderr, "%s\n", curl_easy_strerror(result));
+ return 0;
+ }
+}
+
+int main(void)
+{
+ const char *remote = "sftp://user:pass@example.com/path/filename";
+ const char *filename = "filename";
+ CURL *curlhandle = NULL;
+
+ curl_global_init(CURL_GLOBAL_ALL);
+ curlhandle = curl_easy_init();
+
+ if(!sftpResumeUpload(curlhandle, remote, filename)) {
+ printf("resumed upload using curl %s failed\n", curl_version());
+ }
+
+ curl_easy_cleanup(curlhandle);
+ curl_global_cleanup();
+
+ return 0;
+}