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162 lines
4.2 KiB
162 lines
4.2 KiB
/***************************************************************************
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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) 1998 - 2017, 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.haxx.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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***************************************************************************/
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/* <DESC>
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* Upload to FTP, resuming failed transfers.
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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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/* parse headers for Content-Length */
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static size_t getcontentlengthfunc(void *ptr, size_t size, size_t nmemb,
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void *stream)
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{
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int r;
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long len = 0;
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r = sscanf(ptr, "Content-Length: %ld\n", &len);
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if(r)
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*((long *) stream) = len;
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return size * nmemb;
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}
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/* discard downloaded data */
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static size_t discardfunc(void *ptr, size_t size, size_t nmemb, void *stream)
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{
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(void)ptr;
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(void)stream;
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return size * nmemb;
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}
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/* read data to upload */
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static size_t readfunc(void *ptr, size_t size, size_t nmemb, void *stream)
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{
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FILE *f = 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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static int upload(CURL *curlhandle, const char *remotepath,
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const char *localpath, long timeout, long tries)
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{
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FILE *f;
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long uploaded_len = 0;
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CURLcode r = CURLE_GOT_NOTHING;
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int c;
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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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if(timeout)
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curl_easy_setopt(curlhandle, CURLOPT_FTP_RESPONSE_TIMEOUT, timeout);
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curl_easy_setopt(curlhandle, CURLOPT_HEADERFUNCTION, getcontentlengthfunc);
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curl_easy_setopt(curlhandle, CURLOPT_HEADERDATA, &uploaded_len);
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curl_easy_setopt(curlhandle, CURLOPT_WRITEFUNCTION, discardfunc);
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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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/* disable passive mode */
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curl_easy_setopt(curlhandle, CURLOPT_FTPPORT, "-");
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curl_easy_setopt(curlhandle, CURLOPT_FTP_CREATE_MISSING_DIRS, 1L);
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curl_easy_setopt(curlhandle, CURLOPT_VERBOSE, 1L);
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for(c = 0; (r != CURLE_OK) && (c < tries); c++) {
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/* are we resuming? */
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if(c) { /* yes */
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/* determine the length of the file already written */
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/*
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* With NOBODY and NOHEADER, libcurl will issue a SIZE
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* command, but the only way to retrieve the result is
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* to parse the returned Content-Length header. Thus,
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* getcontentlengthfunc(). We need discardfunc() above
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* because HEADER will dump the headers to stdout
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* without it.
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*/
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curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 1L);
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curl_easy_setopt(curlhandle, CURLOPT_HEADER, 1L);
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r = curl_easy_perform(curlhandle);
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if(r != CURLE_OK)
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continue;
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curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 0L);
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curl_easy_setopt(curlhandle, CURLOPT_HEADER, 0L);
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fseek(f, uploaded_len, SEEK_SET);
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curl_easy_setopt(curlhandle, CURLOPT_APPEND, 1L);
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}
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else { /* no */
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curl_easy_setopt(curlhandle, CURLOPT_APPEND, 0L);
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}
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r = curl_easy_perform(curlhandle);
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}
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fclose(f);
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if(r == CURLE_OK)
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return 1;
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else {
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fprintf(stderr, "%s\n", curl_easy_strerror(r));
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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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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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upload(curlhandle, "ftp://user:pass@example.com/path/file", "C:\\file",
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0, 3);
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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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