1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "updateutils_win.h"
#include <errno.h>
#include <shlwapi.h>
#include <string.h>
#ifdef MOZ_CLANG_PLUGIN
# define MOZ_RUNINIT __attribute__((annotate("moz_global_var")))
#else
# define MOZ_RUNINIT
#endif
/**
* Note: The reason that these functions are separated from those in
* updatehelper.h/updatehelper.cpp is that those functions are strictly
* used within the updater, whereas changing functions in updateutils_win
* will have effects reaching beyond application update.
*/
// This section implements the minimum set of dirent APIs used by updater.cpp on
// Windows. If updater.cpp is modified to use more of this API, we need to
// implement those parts here too.
MOZ_RUNINIT static dirent gDirEnt;
DIR::DIR(const WCHAR* path) : findHandle(INVALID_HANDLE_VALUE) {
memset(name, 0, sizeof(name));
wcsncpy(name, path, sizeof(name) / sizeof(name[0]));
wcsncat(name, L"\\*", sizeof(name) / sizeof(name[0]) - wcslen(name) - 1);
}
DIR::~DIR() {
if (findHandle != INVALID_HANDLE_VALUE) {
FindClose(findHandle);
}
}
dirent::dirent() { d_name[0] = L'\0'; }
DIR* opendir(const WCHAR* path) { return new DIR(path); }
int closedir(DIR* dir) {
delete dir;
return 0;
}
dirent* readdir(DIR* dir) {
WIN32_FIND_DATAW data;
if (dir->findHandle != INVALID_HANDLE_VALUE) {
BOOL result = FindNextFileW(dir->findHandle, &data);
if (!result) {
if (GetLastError() != ERROR_NO_MORE_FILES) {
errno = ENOENT;
}
return 0;
}
} else {
// Reading the first directory entry
dir->findHandle = FindFirstFileW(dir->name, &data);
if (dir->findHandle == INVALID_HANDLE_VALUE) {
if (GetLastError() == ERROR_FILE_NOT_FOUND) {
errno = ENOENT;
} else {
errno = EBADF;
}
return 0;
}
}
size_t direntBufferLength =
sizeof(gDirEnt.d_name) / sizeof(gDirEnt.d_name[0]);
wcsncpy(gDirEnt.d_name, data.cFileName, direntBufferLength);
// wcsncpy does not guarantee a null-terminated string if the source string is
// too long.
gDirEnt.d_name[direntBufferLength - 1] = '\0';
return &gDirEnt;
}
/**
* Joins a base directory path with a filename.
*
* @param base The base directory path of size MAX_PATH + 1
* @param extra The filename to append
* @return TRUE if the file name was successful appended to base
*/
BOOL PathAppendSafe(LPWSTR base, LPCWSTR extra) {
if (wcslen(base) + wcslen(extra) >= MAX_PATH) {
return FALSE;
}
return PathAppendW(base, extra);
}
/**
* Obtains a uuid as a wide string.
*
* @param outBuf
* A buffer of size MAX_PATH + 1 to store the result.
* @return TRUE if successful
*/
BOOL GetUUIDString(LPWSTR outBuf) {
UUID uuid;
RPC_WSTR uuidString = nullptr;
// Note: the return value of UuidCreate should always be RPC_S_OK on systems
// after Win2K / Win2003 due to the network hardware address no longer being
// used to create the UUID.
if (UuidCreate(&uuid) != RPC_S_OK) {
return FALSE;
}
if (UuidToStringW(&uuid, &uuidString) != RPC_S_OK) {
return FALSE;
}
if (!uuidString) {
return FALSE;
}
if (wcslen(reinterpret_cast<LPCWSTR>(uuidString)) > MAX_PATH) {
return FALSE;
}
wcsncpy(outBuf, reinterpret_cast<LPCWSTR>(uuidString), MAX_PATH + 1);
RpcStringFreeW(&uuidString);
return TRUE;
}
/**
* Build a temporary file path whose name component is a UUID.
*
* @param basePath The base directory path for the temp file
* @param prefix Optional prefix for the beginning of the file name
* @param tmpPath Output full path, with the base directory and the file
* name. Must already have been allocated with size >= MAX_PATH.
* @return TRUE if tmpPath was successfully filled in, FALSE on errors
*/
BOOL GetUUIDTempFilePath(LPCWSTR basePath, LPCWSTR prefix, LPWSTR tmpPath) {
WCHAR filename[MAX_PATH + 1] = {L"\0"};
if (prefix) {
if (wcslen(prefix) > MAX_PATH) {
return FALSE;
}
wcsncpy(filename, prefix, MAX_PATH + 1);
}
WCHAR tmpFileNameString[MAX_PATH + 1] = {L"\0"};
if (!GetUUIDString(tmpFileNameString)) {
return FALSE;
}
size_t tmpFileNameStringLen = wcslen(tmpFileNameString);
if (wcslen(filename) + tmpFileNameStringLen > MAX_PATH) {
return FALSE;
}
wcsncat(filename, tmpFileNameString, tmpFileNameStringLen);
size_t basePathLen = wcslen(basePath);
if (basePathLen > MAX_PATH) {
return FALSE;
}
// Use basePathLen + 1 so wcsncpy will add null termination and if a caller
// doesn't allocate MAX_PATH + 1 for tmpPath this won't fail when there is
// actually enough space allocated.
wcsncpy(tmpPath, basePath, basePathLen + 1);
if (!PathAppendSafe(tmpPath, filename)) {
return FALSE;
}
return TRUE;
}
|
