154 lines
4.1 KiB
C
154 lines
4.1 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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#include "curl_setup.h"
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#if !defined(CURL_DISABLE_COOKIES) || !defined(CURL_DISABLE_ALTSVC) || \
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!defined(CURL_DISABLE_HSTS)
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#include "urldata.h"
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#include "rand.h"
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#include "fopen.h"
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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/*
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The dirslash() function breaks a null-terminated pathname string into
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directory and filename components then returns the directory component up
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to, *AND INCLUDING*, a final '/'. If there is no directory in the path,
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this instead returns a "" string.
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This function returns a pointer to malloc'ed memory.
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The input path to this function is expected to have a file name part.
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*/
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#ifdef _WIN32
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#define PATHSEP "\\"
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#define IS_SEP(x) (((x) == '/') || ((x) == '\\'))
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#elif defined(MSDOS) || defined(__EMX__) || defined(OS2)
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#define PATHSEP "\\"
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#define IS_SEP(x) ((x) == '\\')
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#else
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#define PATHSEP "/"
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#define IS_SEP(x) ((x) == '/')
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#endif
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static char *dirslash(const char *path)
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{
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size_t n;
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struct dynbuf out;
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DEBUGASSERT(path);
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Curl_dyn_init(&out, CURL_MAX_INPUT_LENGTH);
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n = strlen(path);
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if(n) {
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/* find the rightmost path separator, if any */
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while(n && !IS_SEP(path[n-1]))
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--n;
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/* skip over all the path separators, if any */
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while(n && IS_SEP(path[n-1]))
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--n;
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}
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if(Curl_dyn_addn(&out, path, n))
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return NULL;
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/* if there was a directory, append a single trailing slash */
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if(n && Curl_dyn_addn(&out, PATHSEP, 1))
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return NULL;
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return Curl_dyn_ptr(&out);
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}
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/*
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* Curl_fopen() opens a file for writing with a temp name, to be renamed
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* to the final name when completed. If there is an existing file using this
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* name at the time of the open, this function will clone the mode from that
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* file. if 'tempname' is non-NULL, it needs a rename after the file is
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* written.
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*/
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CURLcode Curl_fopen(struct Curl_easy *data, const char *filename,
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FILE **fh, char **tempname)
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{
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CURLcode result = CURLE_WRITE_ERROR;
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unsigned char randbuf[41];
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char *tempstore = NULL;
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struct_stat sb;
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int fd = -1;
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char *dir = NULL;
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*tempname = NULL;
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*fh = fopen(filename, FOPEN_WRITETEXT);
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if(!*fh)
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goto fail;
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if(fstat(fileno(*fh), &sb) == -1 || !S_ISREG(sb.st_mode)) {
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return CURLE_OK;
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}
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fclose(*fh);
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*fh = NULL;
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result = Curl_rand_alnum(data, randbuf, sizeof(randbuf));
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if(result)
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goto fail;
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dir = dirslash(filename);
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if(dir) {
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/* The temp file name should not end up too long for the target file
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system */
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tempstore = aprintf("%s%s.tmp", dir, randbuf);
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free(dir);
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}
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if(!tempstore) {
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result = CURLE_OUT_OF_MEMORY;
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goto fail;
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}
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result = CURLE_WRITE_ERROR;
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fd = open(tempstore, O_WRONLY | O_CREAT | O_EXCL, 0600|sb.st_mode);
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if(fd == -1)
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goto fail;
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*fh = fdopen(fd, FOPEN_WRITETEXT);
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if(!*fh)
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goto fail;
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*tempname = tempstore;
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return CURLE_OK;
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fail:
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if(fd != -1) {
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close(fd);
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unlink(tempstore);
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}
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free(tempstore);
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return result;
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}
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#endif /* ! disabled */
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