1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define ATRACE_TAG ATRACE_TAG_PACKAGE_MANAGER
18
19 #include "NetlinkManager.h"
20 #include "VoldNativeService.h"
21 #include "VoldUtil.h"
22 #include "VolumeManager.h"
23 #include "model/Disk.h"
24 #include "sehandle.h"
25
26 #include <android-base/logging.h>
27 #include <android-base/properties.h>
28 #include <android-base/stringprintf.h>
29 #include <cutils/klog.h>
30 #include <hidl/HidlTransportSupport.h>
31 #include <utils/Trace.h>
32
33 #include <dirent.h>
34 #include <errno.h>
35 #include <fcntl.h>
36 #include <fs_mgr.h>
37 #include <getopt.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <sys/stat.h>
42 #include <sys/types.h>
43
44 static int process_config(VolumeManager* vm, bool* has_adoptable, bool* has_quota,
45 bool* has_reserved);
46 static void coldboot(const char* path);
47 static void parse_args(int argc, char** argv);
48
49 struct selabel_handle* sehandle;
50
51 using android::base::StringPrintf;
52 using android::fs_mgr::ReadDefaultFstab;
53
main(int argc,char ** argv)54 int main(int argc, char** argv) {
55 atrace_set_tracing_enabled(false);
56 setenv("ANDROID_LOG_TAGS", "*:d", 1); // Do not submit with verbose logs enabled
57 android::base::InitLogging(argv, android::base::LogdLogger(android::base::SYSTEM));
58
59 LOG(INFO) << "Vold 3.0 (the awakening) firing up";
60
61 ATRACE_BEGIN("main");
62
63 LOG(DEBUG) << "Detected support for:"
64 << (android::vold::IsFilesystemSupported("ext4") ? " ext4" : "")
65 << (android::vold::IsFilesystemSupported("f2fs") ? " f2fs" : "")
66 << (android::vold::IsFilesystemSupported("vfat") ? " vfat" : "");
67
68 VolumeManager* vm;
69 NetlinkManager* nm;
70
71 parse_args(argc, argv);
72
73 sehandle = selinux_android_file_context_handle();
74 if (sehandle) {
75 selinux_android_set_sehandle(sehandle);
76 }
77
78 mkdir("/dev/block/vold", 0755);
79
80 /* For when cryptfs checks and mounts an encrypted filesystem */
81 klog_set_level(6);
82
83 /* Create our singleton managers */
84 if (!(vm = VolumeManager::Instance())) {
85 LOG(ERROR) << "Unable to create VolumeManager";
86 exit(1);
87 }
88
89 if (!(nm = NetlinkManager::Instance())) {
90 LOG(ERROR) << "Unable to create NetlinkManager";
91 exit(1);
92 }
93
94 if (android::base::GetBoolProperty("vold.debug", false)) {
95 vm->setDebug(true);
96 }
97
98 if (vm->start()) {
99 PLOG(ERROR) << "Unable to start VolumeManager";
100 exit(1);
101 }
102
103 bool has_adoptable;
104 bool has_quota;
105 bool has_reserved;
106
107 if (process_config(vm, &has_adoptable, &has_quota, &has_reserved)) {
108 PLOG(ERROR) << "Error reading configuration... continuing anyways";
109 }
110
111 android::hardware::configureRpcThreadpool(1, false /* callerWillJoin */);
112
113 ATRACE_BEGIN("VoldNativeService::start");
114 if (android::vold::VoldNativeService::start() != android::OK) {
115 LOG(ERROR) << "Unable to start VoldNativeService";
116 exit(1);
117 }
118 ATRACE_END();
119
120 LOG(DEBUG) << "VoldNativeService::start() completed OK";
121
122 ATRACE_BEGIN("NetlinkManager::start");
123 if (nm->start()) {
124 PLOG(ERROR) << "Unable to start NetlinkManager";
125 exit(1);
126 }
127 ATRACE_END();
128
129 // This call should go after listeners are started to avoid
130 // a deadlock between vold and init (see b/34278978 for details)
131 android::base::SetProperty("vold.has_adoptable", has_adoptable ? "1" : "0");
132 android::base::SetProperty("vold.has_quota", has_quota ? "1" : "0");
133 android::base::SetProperty("vold.has_reserved", has_reserved ? "1" : "0");
134
135 // Do coldboot here so it won't block booting,
136 // also the cold boot is needed in case we have flash drive
137 // connected before Vold launched
138 coldboot("/sys/block");
139
140 ATRACE_END();
141
142 android::IPCThreadState::self()->joinThreadPool();
143 LOG(INFO) << "vold shutting down";
144
145 exit(0);
146 }
147
parse_args(int argc,char ** argv)148 static void parse_args(int argc, char** argv) {
149 static struct option opts[] = {
150 {"blkid_context", required_argument, 0, 'b'},
151 {"blkid_untrusted_context", required_argument, 0, 'B'},
152 {"fsck_context", required_argument, 0, 'f'},
153 {"fsck_untrusted_context", required_argument, 0, 'F'},
154 {nullptr, 0, nullptr, 0},
155 };
156
157 int c;
158 while ((c = getopt_long(argc, argv, "", opts, nullptr)) != -1) {
159 switch (c) {
160 // clang-format off
161 case 'b': android::vold::sBlkidContext = optarg; break;
162 case 'B': android::vold::sBlkidUntrustedContext = optarg; break;
163 case 'f': android::vold::sFsckContext = optarg; break;
164 case 'F': android::vold::sFsckUntrustedContext = optarg; break;
165 // clang-format on
166 }
167 }
168
169 CHECK(android::vold::sBlkidContext != nullptr);
170 CHECK(android::vold::sBlkidUntrustedContext != nullptr);
171 CHECK(android::vold::sFsckContext != nullptr);
172 CHECK(android::vold::sFsckUntrustedContext != nullptr);
173 }
174
do_coldboot(DIR * d,int lvl)175 static void do_coldboot(DIR* d, int lvl) {
176 struct dirent* de;
177 int dfd, fd;
178
179 dfd = dirfd(d);
180
181 fd = openat(dfd, "uevent", O_WRONLY | O_CLOEXEC);
182 if (fd >= 0) {
183 write(fd, "add\n", 4);
184 close(fd);
185 }
186
187 while ((de = readdir(d))) {
188 DIR* d2;
189
190 if (de->d_name[0] == '.') continue;
191
192 if (de->d_type != DT_DIR && lvl > 0) continue;
193
194 fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
195 if (fd < 0) continue;
196
197 d2 = fdopendir(fd);
198 if (d2 == 0)
199 close(fd);
200 else {
201 do_coldboot(d2, lvl + 1);
202 closedir(d2);
203 }
204 }
205 }
206
coldboot(const char * path)207 static void coldboot(const char* path) {
208 ATRACE_NAME("coldboot");
209 DIR* d = opendir(path);
210 if (d) {
211 do_coldboot(d, 0);
212 closedir(d);
213 }
214 }
215
process_config(VolumeManager * vm,bool * has_adoptable,bool * has_quota,bool * has_reserved)216 static int process_config(VolumeManager* vm, bool* has_adoptable, bool* has_quota,
217 bool* has_reserved) {
218 ATRACE_NAME("process_config");
219
220 if (!ReadDefaultFstab(&fstab_default)) {
221 PLOG(ERROR) << "Failed to open default fstab";
222 return -1;
223 }
224
225 /* Loop through entries looking for ones that vold manages */
226 *has_adoptable = false;
227 *has_quota = false;
228 *has_reserved = false;
229 for (auto& entry : fstab_default) {
230 if (entry.fs_mgr_flags.quota) {
231 *has_quota = true;
232 }
233 if (entry.reserved_size > 0) {
234 *has_reserved = true;
235 }
236
237 /* Make sure logical partitions have an updated blk_device. */
238 if (entry.fs_mgr_flags.logical && !fs_mgr_update_logical_partition(&entry)) {
239 PLOG(FATAL) << "could not find logical partition " << entry.blk_device;
240 }
241
242 if (entry.fs_mgr_flags.vold_managed) {
243 if (entry.fs_mgr_flags.nonremovable) {
244 LOG(WARNING) << "nonremovable no longer supported; ignoring volume";
245 continue;
246 }
247
248 std::string sysPattern(entry.blk_device);
249 std::string nickname(entry.label);
250 int flags = 0;
251
252 if (entry.is_encryptable()) {
253 flags |= android::vold::Disk::Flags::kAdoptable;
254 *has_adoptable = true;
255 }
256 if (entry.fs_mgr_flags.no_emulated_sd ||
257 android::base::GetBoolProperty("vold.debug.default_primary", false)) {
258 flags |= android::vold::Disk::Flags::kDefaultPrimary;
259 }
260
261 vm->addDiskSource(std::shared_ptr<VolumeManager::DiskSource>(
262 new VolumeManager::DiskSource(sysPattern, nickname, flags)));
263 }
264 }
265 return 0;
266 }
267