160 lines
3.9 KiB
C
160 lines
3.9 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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* $Id$
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*
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* Upload to FTP, resuming failed transfers
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*
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* Compile for MinGW like this:
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* gcc -Wall -pedantic -std=c99 ftpuploadwithresume.c -o ftpuploadresume.exe
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* -lcurl -lmsvcr70
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*
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* Written by Philip Bock
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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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#if defined(_MSC_VER) && (_MSC_VER < 1300)
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# error _snscanf requires MSVC 7.0 or later.
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#endif
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/* The MinGW headers are missing a few Win32 function definitions,
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you shouldn't need this if you use VC++ */
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#ifdef __MINGW32__
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int __cdecl _snscanf(const char * input, size_t length, const char * format, ...);
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#endif
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/* parse headers for Content-Length */
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size_t getcontentlengthfunc(void *ptr, size_t size, size_t nmemb, void *stream) {
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int r;
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long len = 0;
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/* _snscanf() is Win32 specific */
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r = _snscanf(ptr, size * nmemb, "Content-Length: %ld\n", &len);
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if (r) /* Microsoft: we don't read the specs */
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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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size_t discardfunc(void *ptr, size_t size, size_t nmemb, 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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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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int upload(CURL *curlhandle, const char * remotepath, const char * localpath,
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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 == NULL) {
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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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curl_easy_setopt(curlhandle, CURLOPT_FTPPORT, "-"); /* disable passive mode */
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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(int c, char **argv) {
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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@host/path/file", "C:\\file", 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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