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sftp: fix range downloads in both SSH backends

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When asking for the last N bytes of a file, and that size was larger
than the file size, it would miss the first byte due to a logic error.

The fixed range parser is now made a common function in the file now
renamed to vssh.c (from curl_path.c) - used by both backends.

Unit test 2605 verifies the parser.

Reported-by: Stanislav Fort (Aisle Research)
Closes #19460
This commit is contained in:
Daniel Stenberg 2025-11-11 09:42:16 +01:00
parent 67ef4a34f2
commit c545e10fa7
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12 changed files with 204 additions and 84 deletions
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40
lib/vssh/vssh.h Normal file
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#ifndef HEADER_CURL_PATH_H
#define HEADER_CURL_PATH_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 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.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.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "../curl_setup.h"
#include <curl/curl.h>
#include "../urldata.h"
CURLcode Curl_getworkingpath(struct Curl_easy *data,
char *homedir,
char **path);
CURLcode Curl_get_pathname(const char **cpp, char **path, const char *homedir);
CURLcode Curl_ssh_range(struct Curl_easy *data,
const char *range, curl_off_t filesize,
curl_off_t *startp, curl_off_t *sizep);
#endif /* HEADER_CURL_PATH_H */