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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
#include "idmap.h"
#include <UniquePtr.h>
#include <androidfw/ResourceTypes.h>
#include <androidfw/StreamingZipInflater.h>
#include <androidfw/ZipFileRO.h>
#include <private/android_filesystem_config.h> // for AID_SYSTEM
#include <utils/SortedVector.h>
#include <utils/String16.h>
#include <utils/String8.h>
#include <dirent.h>
#define NO_OVERLAY_TAG (-1000)
using namespace android;
namespace {
struct Overlay {
Overlay() {}
Overlay(const String8& a, const String8& i, int p) :
apk_path(a), idmap_path(i), priority(p) {}
bool operator<(Overlay const& rhs) const
{
// Note: order is reversed by design
return rhs.priority < priority;
}
String8 apk_path;
String8 idmap_path;
int priority;
};
bool writePackagesList(const char *filename, const SortedVector<Overlay>& overlayVector)
{
FILE* fout = fopen(filename, "w");
if (fout == NULL) {
return false;
}
for (size_t i = 0; i < overlayVector.size(); ++i) {
const Overlay& overlay = overlayVector[i];
fprintf(fout, "%s %s\n", overlay.apk_path.string(), overlay.idmap_path.string());
}
fclose(fout);
// Make file world readable since Zygote (running as root) will read
// it when creating the initial AssetManger object
const mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // 0644
if (chmod(filename, mode) == -1) {
unlink(filename);
return false;
}
return true;
}
String8 flatten_path(const char *path)
{
String16 tmp(path);
tmp.replaceAll('/', '@');
return String8(tmp);
}
int mkdir_p(const String8& path, uid_t uid, gid_t gid)
{
static const mode_t mode =
S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IXOTH;
struct stat st;
if (stat(path.string(), &st) == 0) {
return 0;
}
if (mkdir_p(path.getPathDir(), uid, gid) < 0) {
return -1;
}
if (mkdir(path.string(), 0755) != 0) {
return -1;
}
if (chown(path.string(), uid, gid) == -1) {
return -1;
}
if (chmod(path.string(), mode) == -1) {
return -1;
}
return 0;
}
int parse_overlay_tag(const ResXMLTree& parser, const char *target_package_name)
{
const size_t N = parser.getAttributeCount();
String16 target;
int priority = -1;
for (size_t i = 0; i < N; ++i) {
size_t len;
String16 key(parser.getAttributeName(i, &len));
if (key == String16("targetPackage")) {
const uint16_t *p = parser.getAttributeStringValue(i, &len);
if (p) {
target = String16(p, len);
}
} else if (key == String16("priority")) {
Res_value v;
if (parser.getAttributeValue(i, &v) == sizeof(Res_value)) {
priority = v.data;
if (priority < 0 || priority > 9999) {
return -1;
}
}
}
}
if (target == String16(target_package_name)) {
return priority;
}
return NO_OVERLAY_TAG;
}
int parse_manifest(const void *data, size_t size, const char *target_package_name)
{
ResXMLTree parser(data, size);
if (parser.getError() != NO_ERROR) {
ALOGD("%s failed to init xml parser, error=0x%08x\n", __FUNCTION__, parser.getError());
return -1;
}
ResXMLParser::event_code_t type;
do {
type = parser.next();
if (type == ResXMLParser::START_TAG) {
size_t len;
String16 tag(parser.getElementName(&len));
if (tag == String16("overlay")) {
return parse_overlay_tag(parser, target_package_name);
}
}
} while (type != ResXMLParser::BAD_DOCUMENT && type != ResXMLParser::END_DOCUMENT);
return NO_OVERLAY_TAG;
}
int parse_apk(const char *path, const char *target_package_name)
{
UniquePtr<ZipFileRO> zip(ZipFileRO::open(path));
if (zip.get() == NULL) {
ALOGW("%s: failed to open zip %s\n", __FUNCTION__, path);
return -1;
}
ZipEntryRO entry;
if ((entry = zip->findEntryByName("AndroidManifest.xml")) == NULL) {
ALOGW("%s: failed to find entry AndroidManifest.xml\n", __FUNCTION__);
return -1;
}
size_t uncompLen = 0;
int method;
if (!zip->getEntryInfo(entry, &method, &uncompLen, NULL, NULL, NULL, NULL)) {
ALOGW("%s: failed to read entry info\n", __FUNCTION__);
return -1;
}
if (method != ZipFileRO::kCompressDeflated) {
ALOGW("%s: cannot handle zip compression method %d\n", __FUNCTION__, method);
return -1;
}
FileMap *dataMap = zip->createEntryFileMap(entry);
if (!dataMap) {
ALOGW("%s: failed to create FileMap\n", __FUNCTION__);
return -1;
}
char *buf = new char[uncompLen];
if (NULL == buf) {
ALOGW("%s: failed to allocate %d byte\n", __FUNCTION__, uncompLen);
dataMap->release();
return -1;
}
StreamingZipInflater inflater(dataMap, uncompLen);
if (inflater.read(buf, uncompLen) < 0) {
ALOGW("%s: failed to inflate %d byte\n", __FUNCTION__, uncompLen);
delete[] buf;
dataMap->release();
return -1;
}
int priority = parse_manifest(buf, uncompLen, target_package_name);
delete[] buf;
dataMap->release();
return priority;
}
}
int idmap_scan(const char *overlay_dir, const char *target_package_name,
const char *target_apk_path, const char *idmap_dir)
{
String8 filename = String8(idmap_dir);
filename.appendPath("overlays.list");
if (unlink(filename.string()) != 0 && errno != ENOENT) {
return EXIT_FAILURE;
}
DIR *dir = opendir(overlay_dir);
if (dir == NULL) {
return EXIT_FAILURE;
}
SortedVector<Overlay> overlayVector;
struct dirent *dirent;
while ((dirent = readdir(dir)) != NULL) {
struct stat st;
char overlay_apk_path[PATH_MAX + 1];
snprintf(overlay_apk_path, PATH_MAX, "%s/%s", overlay_dir, dirent->d_name);
if (stat(overlay_apk_path, &st) < 0) {
continue;
}
if (!S_ISREG(st.st_mode)) {
continue;
}
int priority = parse_apk(overlay_apk_path, target_package_name);
if (priority < 0) {
continue;
}
String8 idmap_path(idmap_dir);
idmap_path.appendPath(flatten_path(overlay_apk_path + 1));
idmap_path.append("@idmap");
if (idmap_create_path(target_apk_path, overlay_apk_path, idmap_path.string()) != 0) {
ALOGE("error: failed to create idmap for target=%s overlay=%s idmap=%s\n",
target_apk_path, overlay_apk_path, idmap_path.string());
continue;
}
Overlay overlay(String8(overlay_apk_path), idmap_path, priority);
overlayVector.add(overlay);
}
closedir(dir);
if (!writePackagesList(filename.string(), overlayVector)) {
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
|
