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1 | /* | |
2 | * Temp file utilities for CUPS. | |
3 | * | |
4 | * Copyright © 2007-2018 by Apple Inc. | |
5 | * Copyright © 1997-2006 by Easy Software Products. | |
6 | * | |
7 | * Licensed under Apache License v2.0. See the file "LICENSE" for more | |
8 | * information. | |
9 | */ | |
10 | ||
11 | /* | |
12 | * Include necessary headers... | |
13 | */ | |
14 | ||
15 | #include "cups-private.h" | |
16 | #include "debug-internal.h" | |
17 | #include <stdlib.h> | |
18 | #include <fcntl.h> | |
19 | #include <sys/stat.h> | |
20 | #if defined(_WIN32) || defined(__EMX__) | |
21 | # include <io.h> | |
22 | #else | |
23 | # include <unistd.h> | |
24 | #endif /* _WIN32 || __EMX__ */ | |
25 | ||
26 | ||
27 | /* | |
28 | * 'cupsTempFd()' - Creates a temporary file. | |
29 | * | |
30 | * The temporary filename is returned in the filename buffer. | |
31 | * The temporary file is opened for reading and writing. | |
32 | */ | |
33 | ||
34 | int /* O - New file descriptor or -1 on error */ | |
35 | cupsTempFd(char *filename, /* I - Pointer to buffer */ | |
36 | int len) /* I - Size of buffer */ | |
37 | { | |
38 | int fd; /* File descriptor for temp file */ | |
39 | int tries; /* Number of tries */ | |
40 | const char *tmpdir; /* TMPDIR environment var */ | |
41 | #if defined(__APPLE__) || defined(_WIN32) | |
42 | char tmppath[1024]; /* Temporary directory */ | |
43 | #endif /* __APPLE__ || _WIN32 */ | |
44 | #ifdef _WIN32 | |
45 | DWORD curtime; /* Current time */ | |
46 | #else | |
47 | struct timeval curtime; /* Current time */ | |
48 | #endif /* _WIN32 */ | |
49 | ||
50 | ||
51 | /* | |
52 | * See if TMPDIR is defined... | |
53 | */ | |
54 | ||
55 | #ifdef _WIN32 | |
56 | if ((tmpdir = getenv("TEMP")) == NULL) | |
57 | { | |
58 | GetTempPathA(sizeof(tmppath), tmppath); | |
59 | tmpdir = tmppath; | |
60 | } | |
61 | ||
62 | #elif defined(__APPLE__) | |
63 | /* | |
64 | * On macOS and iOS, the TMPDIR environment variable is not always the best | |
65 | * location to place temporary files due to sandboxing. Instead, the confstr | |
66 | * function should be called to get the proper per-user, per-process TMPDIR | |
67 | * value. | |
68 | */ | |
69 | ||
70 | if ((tmpdir = getenv("TMPDIR")) != NULL && access(tmpdir, W_OK)) | |
71 | tmpdir = NULL; | |
72 | ||
73 | if (!tmpdir) | |
74 | { | |
75 | if (confstr(_CS_DARWIN_USER_TEMP_DIR, tmppath, sizeof(tmppath))) | |
76 | tmpdir = tmppath; | |
77 | else | |
78 | tmpdir = "/private/tmp"; /* This should never happen */ | |
79 | } | |
80 | ||
81 | #else | |
82 | /* | |
83 | * Previously we put root temporary files in the default CUPS temporary | |
84 | * directory under /var/spool/cups. However, since the scheduler cleans | |
85 | * out temporary files there and runs independently of the user apps, we | |
86 | * don't want to use it unless specifically told to by cupsd. | |
87 | */ | |
88 | ||
89 | if ((tmpdir = getenv("TMPDIR")) == NULL) | |
90 | tmpdir = "/tmp"; | |
91 | #endif /* _WIN32 */ | |
92 | ||
93 | /* | |
94 | * Make the temporary name using the specified directory... | |
95 | */ | |
96 | ||
97 | tries = 0; | |
98 | ||
99 | do | |
100 | { | |
101 | #ifdef _WIN32 | |
102 | /* | |
103 | * Get the current time of day... | |
104 | */ | |
105 | ||
106 | curtime = GetTickCount() + tries; | |
107 | ||
108 | /* | |
109 | * Format a string using the hex time values... | |
110 | */ | |
111 | ||
112 | snprintf(filename, (size_t)len - 1, "%s/%05lx%08lx", tmpdir, GetCurrentProcessId(), curtime); | |
113 | #else | |
114 | /* | |
115 | * Get the current time of day... | |
116 | */ | |
117 | ||
118 | gettimeofday(&curtime, NULL); | |
119 | ||
120 | /* | |
121 | * Format a string using the hex time values... | |
122 | */ | |
123 | ||
124 | snprintf(filename, (size_t)len - 1, "%s/%05x%08x", tmpdir, (unsigned)getpid(), (unsigned)(curtime.tv_sec + curtime.tv_usec + tries)); | |
125 | #endif /* _WIN32 */ | |
126 | ||
127 | /* | |
128 | * Open the file in "exclusive" mode, making sure that we don't | |
129 | * stomp on an existing file or someone's symlink crack... | |
130 | */ | |
131 | ||
132 | #ifdef _WIN32 | |
133 | fd = open(filename, _O_CREAT | _O_RDWR | _O_TRUNC | _O_BINARY, | |
134 | _S_IREAD | _S_IWRITE); | |
135 | #elif defined(O_NOFOLLOW) | |
136 | fd = open(filename, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW, 0600); | |
137 | #else | |
138 | fd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600); | |
139 | #endif /* _WIN32 */ | |
140 | ||
141 | if (fd < 0 && errno != EEXIST) | |
142 | break; | |
143 | ||
144 | tries ++; | |
145 | } | |
146 | while (fd < 0 && tries < 1000); | |
147 | ||
148 | /* | |
149 | * Return the file descriptor... | |
150 | */ | |
151 | ||
152 | return (fd); | |
153 | } | |
154 | ||
155 | ||
156 | /* | |
157 | * 'cupsTempFile()' - Generates a temporary filename. | |
158 | * | |
159 | * The temporary filename is returned in the filename buffer. | |
160 | * This function is deprecated and will no longer generate a temporary | |
161 | * filename - use @link cupsTempFd@ or @link cupsTempFile2@ instead. | |
162 | * | |
163 | * @deprecated@ | |
164 | */ | |
165 | ||
166 | char * /* O - Filename or @code NULL@ on error */ | |
167 | cupsTempFile(char *filename, /* I - Pointer to buffer */ | |
168 | int len) /* I - Size of buffer */ | |
169 | { | |
170 | (void)len; | |
171 | ||
172 | if (filename) | |
173 | *filename = '\0'; | |
174 | ||
175 | return (NULL); | |
176 | } | |
177 | ||
178 | ||
179 | /* | |
180 | * 'cupsTempFile2()' - Creates a temporary CUPS file. | |
181 | * | |
182 | * The temporary filename is returned in the filename buffer. | |
183 | * The temporary file is opened for writing. | |
184 | * | |
185 | * @since CUPS 1.2/macOS 10.5@ | |
186 | */ | |
187 | ||
188 | cups_file_t * /* O - CUPS file or @code NULL@ on error */ | |
189 | cupsTempFile2(char *filename, /* I - Pointer to buffer */ | |
190 | int len) /* I - Size of buffer */ | |
191 | { | |
192 | cups_file_t *file; /* CUPS file */ | |
193 | int fd; /* File descriptor */ | |
194 | ||
195 | ||
196 | if ((fd = cupsTempFd(filename, len)) < 0) | |
197 | return (NULL); | |
198 | else if ((file = cupsFileOpenFd(fd, "w")) == NULL) | |
199 | { | |
200 | close(fd); | |
201 | unlink(filename); | |
202 | return (NULL); | |
203 | } | |
204 | else | |
205 | return (file); | |
206 | } |