| 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 1998 - 2022, Daniel Stenberg, <[email protected]>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | * SPDX-License-Identifier: curl
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| 22 | *
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| 23 | ***************************************************************************/
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| 24 |
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| 25 | #include "curl_setup.h"
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| 26 |
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| 27 | #if !defined(CURL_DISABLE_COOKIES) || !defined(CURL_DISABLE_ALTSVC) || \
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| 28 | !defined(CURL_DISABLE_HSTS)
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| 29 |
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| 30 | #ifdef HAVE_FCNTL_H
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| 31 | #include <fcntl.h>
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| 32 | #endif
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| 33 |
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| 34 | #include "urldata.h"
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| 35 | #include "rand.h"
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| 36 | #include "fopen.h"
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| 37 | /* The last 3 #include files should be in this order */
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| 38 | #include "curl_printf.h"
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| 39 | #include "curl_memory.h"
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| 40 | #include "memdebug.h"
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| 41 |
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| 42 | /*
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| 43 | * Curl_fopen() opens a file for writing with a temp name, to be renamed
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| 44 | * to the final name when completed. If there is an existing file using this
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| 45 | * name at the time of the open, this function will clone the mode from that
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| 46 | * file. if 'tempname' is non-NULL, it needs a rename after the file is
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| 47 | * written.
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| 48 | */
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| 49 | CURLcode Curl_fopen(struct Curl_easy *data, const char *filename,
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| 50 | FILE **fh, char **tempname)
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| 51 | {
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| 52 | CURLcode result = CURLE_WRITE_ERROR;
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| 53 | unsigned char randsuffix[9];
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| 54 | char *tempstore = NULL;
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| 55 | struct_stat sb;
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| 56 | int fd = -1;
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| 57 | *tempname = NULL;
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| 58 |
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| 59 | if(stat(filename, &sb) == -1 || !S_ISREG(sb.st_mode)) {
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| 60 | /* a non-regular file, fallback to direct fopen() */
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| 61 | *fh = fopen(filename, FOPEN_WRITETEXT);
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| 62 | if(*fh)
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| 63 | return CURLE_OK;
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| 64 | goto fail;
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| 65 | }
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| 66 |
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| 67 | result = Curl_rand_hex(data, randsuffix, sizeof(randsuffix));
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| 68 | if(result)
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| 69 | goto fail;
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| 70 |
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| 71 | tempstore = aprintf("%s.%s.tmp", filename, randsuffix);
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| 72 | if(!tempstore) {
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| 73 | result = CURLE_OUT_OF_MEMORY;
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| 74 | goto fail;
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| 75 | }
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| 76 |
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| 77 | result = CURLE_WRITE_ERROR;
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| 78 | fd = open(tempstore, O_WRONLY | O_CREAT | O_EXCL, 0600);
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| 79 | if(fd == -1)
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| 80 | goto fail;
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| 81 |
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| 82 | #ifdef HAVE_FCHMOD
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| 83 | {
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| 84 | struct_stat nsb;
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| 85 | if((fstat(fd, &nsb) != -1) &&
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| 86 | (nsb.st_uid == sb.st_uid) && (nsb.st_gid == sb.st_gid)) {
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| 87 | /* if the user and group are the same, clone the original mode */
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| 88 | if(fchmod(fd, sb.st_mode) == -1)
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| 89 | goto fail;
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| 90 | }
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| 91 | }
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| 92 | #endif
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| 93 |
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| 94 | *fh = fdopen(fd, FOPEN_WRITETEXT);
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| 95 | if(!*fh)
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| 96 | goto fail;
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| 97 |
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| 98 | *tempname = tempstore;
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| 99 | return CURLE_OK;
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| 100 |
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| 101 | fail:
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| 102 | if(fd != -1) {
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| 103 | close(fd);
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| 104 | unlink(tempstore);
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| 105 | }
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| 106 |
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| 107 | free(tempstore);
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| 108 |
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| 109 | *tempname = NULL;
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| 110 | return result;
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| 111 | }
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| 112 |
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| 113 | #endif /* ! disabled */
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