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tmpfile.c

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1/*-
2 * tmpfile.c - functions to create and safely open temp files for the shell.-
3 */-
4-
5/* Copyright (C) 2000-2015 Free Software Foundation, Inc.-
6-
7 This file is part of GNU Bash, the Bourne Again SHell.-
8-
9 Bash is free software: you can redistribute it and/or modify-
10 it under the terms of the GNU General Public License as published by-
11 the Free Software Foundation, either version 3 of the License, or-
12 (at your option) any later version.-
13-
14 Bash is distributed in the hope that it will be useful,-
15 but WITHOUT ANY WARRANTY; without even the implied warranty of-
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the-
17 GNU General Public License for more details.-
18-
19 You should have received a copy of the GNU General Public License-
20 along with Bash. If not, see <http://www.gnu.org/licenses/>.-
21*/-
22-
23#include <config.h>-
24-
25#include <bashtypes.h>-
26#include <posixstat.h>-
27#include <posixtime.h>-
28#include <filecntl.h>-
29-
30#if defined (HAVE_UNISTD_H)-
31# include <unistd.h>-
32#endif-
33-
34#include <bashansi.h>-
35-
36#include <stdio.h>-
37#include <errno.h>-
38-
39#include <shell.h>-
40-
41#ifndef errno-
42extern int errno;-
43#endif-
44-
45#define BASEOPENFLAGS (O_CREAT | O_TRUNC | O_EXCL | O_BINARY)-
46-
47#define DEFAULT_TMPDIR "." /* bogus default, should be changed */-
48#define DEFAULT_NAMEROOT "shtmp"-
49-
50/* Use ANSI-C rand() interface if random(3) is not available */-
51#if !HAVE_RANDOM-
52#define random() rand()-
53#endif-
54-
55extern pid_t dollar_dollar_pid;-
56-
57static char *get_sys_tmpdir __P((void));-
58static char *get_tmpdir __P((int));-
59-
60static char *sys_tmpdir = (char *)NULL;-
61static int ntmpfiles;-
62static int tmpnamelen = -1;-
63static unsigned long filenum = 1L;-
64-
65static char *-
66get_sys_tmpdir ()-
67{-
68 if (sys_tmpdir)
sys_tmpdirDescription
TRUEnever evaluated
FALSEnever evaluated
0
69 return sys_tmpdir;
never executed: return sys_tmpdir;
0
70-
71#ifdef P_tmpdir-
72 sys_tmpdir = P_tmpdir;-
73 if (file_iswdir (sys_tmpdir))
file_iswdir (sys_tmpdir)Description
TRUEnever evaluated
FALSEnever evaluated
0
74 return sys_tmpdir;
never executed: return sys_tmpdir;
0
75#endif-
76-
77 sys_tmpdir = "/tmp";-
78 if (file_iswdir (sys_tmpdir))
file_iswdir (sys_tmpdir)Description
TRUEnever evaluated
FALSEnever evaluated
0
79 return sys_tmpdir;
never executed: return sys_tmpdir;
0
80-
81 sys_tmpdir = "/var/tmp";-
82 if (file_iswdir (sys_tmpdir))
file_iswdir (sys_tmpdir)Description
TRUEnever evaluated
FALSEnever evaluated
0
83 return sys_tmpdir;
never executed: return sys_tmpdir;
0
84-
85 sys_tmpdir = "/usr/tmp";-
86 if (file_iswdir (sys_tmpdir))
file_iswdir (sys_tmpdir)Description
TRUEnever evaluated
FALSEnever evaluated
0
87 return sys_tmpdir;
never executed: return sys_tmpdir;
0
88-
89 sys_tmpdir = DEFAULT_TMPDIR;-
90-
91 return sys_tmpdir;
never executed: return sys_tmpdir;
0
92}-
93-
94static char *-
95get_tmpdir (flags)-
96 int flags;-
97{-
98 char *tdir;-
99-
100 tdir = (flags & MT_USETMPDIR) ? get_string_value ("TMPDIR") : (char *)NULL;
(flags & 0x0001)Description
TRUEevaluated 107 times by 1 test
Evaluated by:
  • Self test
FALSEnever evaluated
0-107
101 if (tdir && (file_iswdir (tdir) == 0 || strlen (tdir) > PATH_MAX))
tdirDescription
TRUEevaluated 107 times by 1 test
Evaluated by:
  • Self test
FALSEnever evaluated
file_iswdir (tdir) == 0Description
TRUEnever evaluated
FALSEevaluated 107 times by 1 test
Evaluated by:
  • Self test
strlen (tdir) > 4096Description
TRUEnever evaluated
FALSEevaluated 107 times by 1 test
Evaluated by:
  • Self test
0-107
102 tdir = 0;
never executed: tdir = 0;
0
103-
104 if (tdir == 0)
tdir == 0Description
TRUEnever evaluated
FALSEevaluated 107 times by 1 test
Evaluated by:
  • Self test
0-107
105 tdir = get_sys_tmpdir ();
never executed: tdir = get_sys_tmpdir ();
0
106-
107#if defined (HAVE_PATHCONF) && defined (_PC_NAME_MAX)-
108 if (tmpnamelen == -1)
tmpnamelen == -1Description
TRUEevaluated 76 times by 1 test
Evaluated by:
  • Self test
FALSEevaluated 31 times by 1 test
Evaluated by:
  • Self test
31-76
109 tmpnamelen = pathconf (tdir, _PC_NAME_MAX);
executed 76 times by 1 test: tmpnamelen = pathconf (tdir, _PC_NAME_MAX );
Executed by:
  • Self test
76
110#else-
111 tmpnamelen = 0;-
112#endif-
113-
114 return tdir;
executed 107 times by 1 test: return tdir;
Executed by:
  • Self test
107
115}-
116-
117static void-
118sh_seedrand ()-
119{-
120#if HAVE_RANDOM-
121 int d;-
122 static int seeded = 0;-
123 if (seeded == 0)
seeded == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
124 {-
125 struct timeval tv;-
126 -
127 gettimeofday (&tv, NULL);-
128 srandom (tv.tv_sec ^ tv.tv_usec ^ (getpid () << 16) ^ (uintptr_t)&d);-
129 seeded = 1;-
130 }
never executed: end of block
0
131#endif-
132}
never executed: end of block
0
133-
134char *-
135sh_mktmpname (nameroot, flags)-
136 char *nameroot;-
137 int flags;-
138{-
139 char *filename, *tdir, *lroot;-
140 struct stat sb;-
141 int r, tdlen;-
142 static int seeded = 0;-
143-
144 filename = (char *)xmalloc (PATH_MAX + 1);-
145 tdir = get_tmpdir (flags);-
146 tdlen = strlen (tdir);-
147-
148 lroot = nameroot ? nameroot : DEFAULT_NAMEROOT;
namerootDescription
TRUEnever evaluated
FALSEnever evaluated
0
149-
150#ifdef USE_MKTEMP-
151 sprintf (filename, "%s/%s.XXXXXX", tdir, lroot);-
152 if (mktemp (filename) == 0)
mktemp (filename) == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
153 {-
154 free (filename);-
155 filename = NULL;-
156 }
never executed: end of block
0
157#else /* !USE_MKTEMP */-
158 sh_seedrand ();-
159 while (1)-
160 {-
161 filenum = (filenum << 1) ^-
162 (unsigned long) time ((time_t *)0) ^-
163 (unsigned long) dollar_dollar_pid ^-
164 (unsigned long) ((flags & MT_USERANDOM) ? random () : ntmpfiles++);-
165 sprintf (filename, "%s/%s-%lu", tdir, lroot, filenum);-
166 if (tmpnamelen > 0 && tmpnamelen < 32)-
167 filename[tdlen + 1 + tmpnamelen] = '\0';-
168# ifdef HAVE_LSTAT-
169 r = lstat (filename, &sb);-
170# else-
171 r = stat (filename, &sb);-
172# endif-
173 if (r < 0 && errno == ENOENT)-
174 break;-
175 }-
176#endif /* !USE_MKTEMP */-
177-
178 return filename;
never executed: return filename;
0
179}-
180-
181int-
182sh_mktmpfd (nameroot, flags, namep)-
183 char *nameroot;-
184 int flags;-
185 char **namep;-
186{-
187 char *filename, *tdir, *lroot;-
188 int fd, tdlen;-
189 -
190 filename = (char *)xmalloc (PATH_MAX + 1);-
191 tdir = get_tmpdir (flags);-
192 tdlen = strlen (tdir);-
193-
194 lroot = nameroot ? nameroot : DEFAULT_NAMEROOT;
namerootDescription
TRUEevaluated 107 times by 1 test
Evaluated by:
  • Self test
FALSEnever evaluated
0-107
195-
196#ifdef USE_MKSTEMP-
197 sprintf (filename, "%s/%s.XXXXXX", tdir, lroot);-
198 fd = mkstemp (filename);-
199 if (fd < 0 || namep == 0)
fd < 0Description
TRUEnever evaluated
FALSEevaluated 107 times by 1 test
Evaluated by:
  • Self test
namep == 0Description
TRUEnever evaluated
FALSEevaluated 107 times by 1 test
Evaluated by:
  • Self test
0-107
200 {-
201 free (filename);-
202 filename = NULL;-
203 }
never executed: end of block
0
204 if (namep)
namepDescription
TRUEevaluated 107 times by 1 test
Evaluated by:
  • Self test
FALSEnever evaluated
0-107
205 *namep = filename;
executed 107 times by 1 test: *namep = filename;
Executed by:
  • Self test
107
206 return fd;
executed 107 times by 1 test: return fd;
Executed by:
  • Self test
107
207#else /* !USE_MKSTEMP */-
208 sh_seedrand ();-
209 do-
210 {-
211 filenum = (filenum << 1) ^-
212 (unsigned long) time ((time_t *)0) ^-
213 (unsigned long) dollar_dollar_pid ^-
214 (unsigned long) ((flags & MT_USERANDOM) ? random () : ntmpfiles++);-
215 sprintf (filename, "%s/%s-%lu", tdir, lroot, filenum);-
216 if (tmpnamelen > 0 && tmpnamelen < 32)-
217 filename[tdlen + 1 + tmpnamelen] = '\0';-
218 fd = open (filename, BASEOPENFLAGS | ((flags & MT_READWRITE) ? O_RDWR : O_WRONLY), 0600);-
219 }-
220 while (fd < 0 && errno == EEXIST);-
221-
222 if (namep)-
223 *namep = filename;-
224 else-
225 free (filename);-
226-
227 return fd;-
228#endif /* !USE_MKSTEMP */-
229}-
230-
231FILE *-
232sh_mktmpfp (nameroot, flags, namep)-
233 char *nameroot;-
234 int flags;-
235 char **namep;-
236{-
237 int fd;-
238 FILE *fp;-
239-
240 fd = sh_mktmpfd (nameroot, flags, namep);-
241 if (fd < 0)
fd < 0Description
TRUEnever evaluated
FALSEevaluated 2 times by 1 test
Evaluated by:
  • Self test
0-2
242 return ((FILE *)NULL);
never executed: return ((FILE *) ((void *)0) );
0
243 fp = fdopen (fd, (flags & MT_READWRITE) ? "w+" : "w");-
244 if (fp == 0)
fp == 0Description
TRUEnever evaluated
FALSEevaluated 2 times by 1 test
Evaluated by:
  • Self test
0-2
245 close (fd);
never executed: close (fd);
0
246 return fp;
executed 2 times by 1 test: return fp;
Executed by:
  • Self test
2
247}-
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