Line data Source code
1 : /* keybox-util.c - Utility functions for Keybox
2 : * Copyright (C) 2001 Free Software Foundation, Inc.
3 : *
4 : * This file is part of GnuPG.
5 : *
6 : * GnuPG is free software; you can redistribute it and/or modify
7 : * it under the terms of the GNU General Public License as published by
8 : * the Free Software Foundation; either version 3 of the License, or
9 : * (at your option) any later version.
10 : *
11 : * GnuPG is distributed in the hope that it will be useful,
12 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 : * GNU General Public License for more details.
15 : *
16 : * You should have received a copy of the GNU General Public License
17 : * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 : */
19 :
20 : #include <config.h>
21 : #include <stdlib.h>
22 : #include <stdio.h>
23 : #include <string.h>
24 : #ifdef HAVE_DOSISH_SYSTEM
25 : # define WIN32_LEAN_AND_MEAN /* We only need the OS core stuff. */
26 : # include <windows.h>
27 : #endif
28 :
29 : #include "keybox-defs.h"
30 : #include "utilproto.h"
31 :
32 :
33 : static void *(*alloc_func)(size_t n) = malloc;
34 : static void *(*realloc_func)(void *p, size_t n) = realloc;
35 : static void (*free_func)(void*) = free;
36 :
37 :
38 :
39 : void
40 3 : keybox_set_malloc_hooks ( void *(*new_alloc_func)(size_t n),
41 : void *(*new_realloc_func)(void *p, size_t n),
42 : void (*new_free_func)(void*) )
43 : {
44 3 : alloc_func = new_alloc_func;
45 3 : realloc_func = new_realloc_func;
46 3 : free_func = new_free_func;
47 3 : }
48 :
49 : void *
50 170393 : _keybox_malloc (size_t n)
51 : {
52 170393 : return alloc_func (n);
53 : }
54 :
55 : void *
56 48 : _keybox_realloc (void *a, size_t n)
57 : {
58 48 : return realloc_func (a, n);
59 : }
60 :
61 : void *
62 85255 : _keybox_calloc (size_t n, size_t m)
63 : {
64 85255 : void *p = _keybox_malloc (n*m);
65 85255 : if (p)
66 85255 : memset (p, 0, n* m);
67 85255 : return p;
68 : }
69 :
70 : void
71 495553 : _keybox_free (void *p)
72 : {
73 495553 : if (p)
74 165759 : free_func (p);
75 495553 : }
76 :
77 :
78 : /* Store the two malloced temporary file names used for keybox updates
79 : of file FILENAME at R_BAKNAME and R_TMPNAME. On error an error
80 : code is returned and NULL stored at R_BAKNAME and R_TMPNAME. If
81 : FOR_KEYRING is true the returned names match those used by GnuPG's
82 : keyring code. */
83 : gpg_error_t
84 73 : keybox_tmp_names (const char *filename, int for_keyring,
85 : char **r_bakname, char **r_tmpname)
86 : {
87 : gpg_error_t err;
88 : char *bak_name, *tmp_name;
89 :
90 73 : *r_bakname = NULL;
91 73 : *r_tmpname = NULL;
92 :
93 : # ifdef USE_ONLY_8DOT3
94 : /* Here is another Windoze bug?:
95 : * you can't rename("pubring.kbx.tmp", "pubring.kbx");
96 : * but rename("pubring.kbx.tmp", "pubring.aaa");
97 : * works. So we replace ".kbx" by ".kb_" or ".k__". Note that we
98 : * can't use ".bak" and ".tmp", because these suffixes are used by
99 : * gpg's keyrings and would lead to a sharing violation or data
100 : * corruption. If the name does not end in ".kbx" we assume working
101 : * on a modern file system and append the suffix. */
102 : {
103 : const char *ext = for_keyring? EXTSEP_S GPGEXT_GPG : EXTSEP_S "kbx";
104 : const char *b_ext = for_keyring? EXTSEP_S "bak" : EXTSEP_S "kb_";
105 : const char *t_ext = for_keyring? EXTSEP_S "tmp" : EXTSEP_S "k__";
106 : int repl;
107 :
108 : if (strlen (ext) != 4 || strlen (b_ext) != 4)
109 : BUG ();
110 : repl = (strlen (filename) > 4
111 : && !strcmp (filename + strlen (filename) - 4, ext));
112 : bak_name = xtrymalloc (strlen (filename) + (repl?0:4) + 1);
113 : if (!bak_name)
114 : return gpg_error_from_syserror ();
115 : strcpy (bak_name, filename);
116 : strcpy (bak_name + strlen (filename) - (repl?4:0), b_ext);
117 :
118 : tmp_name = xtrymalloc (strlen (filename) + (repl?0:4) + 1);
119 : if (!tmp_name)
120 : {
121 : err = gpg_error_from_syserror ();
122 : xfree (bak_name);
123 : return err;
124 : }
125 : strcpy (tmp_name, filename);
126 : strcpy (tmp_name + strlen (filename) - (repl?4:0), t_ext);
127 : }
128 : # else /* Posix file names */
129 : (void)for_keyring;
130 73 : bak_name = xtrymalloc (strlen (filename) + 2);
131 73 : if (!bak_name)
132 0 : return gpg_error_from_syserror ();
133 73 : strcpy (stpcpy (bak_name, filename), "~");
134 :
135 73 : tmp_name = xtrymalloc (strlen (filename) + 5);
136 73 : if (!tmp_name)
137 : {
138 0 : err = gpg_error_from_syserror ();
139 0 : xfree (bak_name);
140 0 : return err;
141 : }
142 73 : strcpy (stpcpy (tmp_name,filename), EXTSEP_S "tmp");
143 : # endif /* Posix filename */
144 :
145 73 : *r_bakname = bak_name;
146 73 : *r_tmpname = tmp_name;
147 73 : return 0;
148 : }
149 :
150 :
151 : /* Wrapper for rename(2) to handle Windows peculiarities. If
152 : * BLOCK_SIGNALS is not NULL and points to a variable set to true, all
153 : * signals will be blocked by calling gnupg_block_all_signals; the
154 : * caller needs to call gnupg_unblock_all_signals if that variable is
155 : * still set to true on return. */
156 : gpg_error_t
157 142 : keybox_file_rename (const char *oldname, const char *newname,
158 : int *block_signals)
159 : {
160 142 : gpg_error_t err = 0;
161 :
162 142 : if (block_signals && *block_signals)
163 71 : gnupg_block_all_signals ();
164 :
165 : #ifdef HAVE_DOSISH_SYSTEM
166 : {
167 : int wtime = 0;
168 :
169 : gnupg_remove (newname);
170 : again:
171 : if (rename (oldname, newname))
172 : {
173 : if (GetLastError () == ERROR_SHARING_VIOLATION)
174 : {
175 : /* Another process has the file open. We do not use a
176 : * lock for read but instead we wait until the other
177 : * process has closed the file. This may take long but
178 : * that would also be the case with a dotlock approach for
179 : * read and write. Note that we don't need this on Unix
180 : * due to the inode concept.
181 : *
182 : * So let's wait until the rename has worked. The retry
183 : * intervals are 50, 100, 200, 400, 800, 50ms, ... */
184 : if (!wtime || wtime >= 800)
185 : wtime = 50;
186 : else
187 : wtime *= 2;
188 :
189 : if (wtime >= 800)
190 : log_info ("waiting for file '%s' to become accessible ...\n",
191 : oldname);
192 :
193 : Sleep (wtime);
194 : goto again;
195 : }
196 : err = gpg_error_from_syserror ();
197 : }
198 : }
199 : #else /* Unix */
200 : {
201 : #ifdef __riscos__
202 : gnupg_remove (newname);
203 : #endif
204 142 : if (rename (oldname, newname) )
205 0 : err = gpg_error_from_syserror ();
206 : }
207 : #endif /* Unix */
208 :
209 142 : if (block_signals && *block_signals && err)
210 : {
211 0 : gnupg_unblock_all_signals ();
212 0 : *block_signals = 0;
213 : }
214 :
215 142 : if (err)
216 0 : log_error ("renaming '%s' to '%s' failed: %s\n",
217 : oldname, newname, gpg_strerror (err));
218 142 : return err;
219 : }
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