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 #include "Disk.h"
18 #include "VolumeManager.h"
19 #include "CommandListener.h"
20 #include "CryptCommandListener.h"
21 #include "NetlinkManager.h"
22 #include "cryptfs.h"
23 #include "sehandle.h"
24
25 #include <android-base/logging.h>
26 #include <android-base/stringprintf.h>
27 #include <cutils/klog.h>
28 #include <cutils/properties.h>
29 #include <cutils/sockets.h>
30
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <errno.h>
34 #include <string.h>
35 #include <sys/stat.h>
36 #include <sys/types.h>
37 #include <getopt.h>
38 #include <fcntl.h>
39 #include <dirent.h>
40 #include <fs_mgr.h>
41
42 static int process_config(VolumeManager *vm, bool* has_adoptable);
43 static void coldboot(const char *path);
44 static void parse_args(int argc, char** argv);
45
46 struct fstab *fstab;
47
48 struct selabel_handle *sehandle;
49
50 using android::base::StringPrintf;
51
main(int argc,char ** argv)52 int main(int argc, char** argv) {
53 setenv("ANDROID_LOG_TAGS", "*:v", 1);
54 android::base::InitLogging(argv, android::base::LogdLogger(android::base::SYSTEM));
55
56 LOG(INFO) << "Vold 3.0 (the awakening) firing up";
57
58 LOG(VERBOSE) << "Detected support for:"
59 << (android::vold::IsFilesystemSupported("ext4") ? " ext4" : "")
60 << (android::vold::IsFilesystemSupported("f2fs") ? " f2fs" : "")
61 << (android::vold::IsFilesystemSupported("vfat") ? " vfat" : "");
62
63 VolumeManager *vm;
64 CommandListener *cl;
65 CryptCommandListener *ccl;
66 NetlinkManager *nm;
67
68 parse_args(argc, argv);
69
70 sehandle = selinux_android_file_context_handle();
71 if (sehandle) {
72 selinux_android_set_sehandle(sehandle);
73 }
74
75 // Quickly throw a CLOEXEC on the socket we just inherited from init
76 fcntl(android_get_control_socket("vold"), F_SETFD, FD_CLOEXEC);
77 fcntl(android_get_control_socket("cryptd"), F_SETFD, FD_CLOEXEC);
78
79 mkdir("/dev/block/vold", 0755);
80
81 /* For when cryptfs checks and mounts an encrypted filesystem */
82 klog_set_level(6);
83
84 /* Create our singleton managers */
85 if (!(vm = VolumeManager::Instance())) {
86 LOG(ERROR) << "Unable to create VolumeManager";
87 exit(1);
88 }
89
90 if (!(nm = NetlinkManager::Instance())) {
91 LOG(ERROR) << "Unable to create NetlinkManager";
92 exit(1);
93 }
94
95 if (property_get_bool("vold.debug", false)) {
96 vm->setDebug(true);
97 }
98
99 cl = new CommandListener();
100 ccl = new CryptCommandListener();
101 vm->setBroadcaster((SocketListener *) cl);
102 nm->setBroadcaster((SocketListener *) cl);
103
104 if (vm->start()) {
105 PLOG(ERROR) << "Unable to start VolumeManager";
106 exit(1);
107 }
108
109 bool has_adoptable;
110
111 if (process_config(vm, &has_adoptable)) {
112 PLOG(ERROR) << "Error reading configuration... continuing anyways";
113 }
114
115 if (nm->start()) {
116 PLOG(ERROR) << "Unable to start NetlinkManager";
117 exit(1);
118 }
119
120 /*
121 * Now that we're up, we can respond to commands
122 */
123 if (cl->startListener()) {
124 PLOG(ERROR) << "Unable to start CommandListener";
125 exit(1);
126 }
127
128 if (ccl->startListener()) {
129 PLOG(ERROR) << "Unable to start CryptCommandListener";
130 exit(1);
131 }
132
133 // This call should go after listeners are started to avoid
134 // a deadlock between vold and init (see b/34278978 for details)
135 property_set("vold.has_adoptable", has_adoptable ? "1" : "0");
136
137 // Do coldboot here so it won't block booting,
138 // also the cold boot is needed in case we have flash drive
139 // connected before Vold launched
140 coldboot("/sys/block");
141 // Eventually we'll become the monitoring thread
142 while(1) {
143 pause();
144 }
145
146 LOG(ERROR) << "Vold exiting";
147 exit(0);
148 }
149
parse_args(int argc,char ** argv)150 static void parse_args(int argc, char** argv) {
151 static struct option opts[] = {
152 {"blkid_context", required_argument, 0, 'b' },
153 {"blkid_untrusted_context", required_argument, 0, 'B' },
154 {"fsck_context", required_argument, 0, 'f' },
155 {"fsck_untrusted_context", required_argument, 0, 'F' },
156 };
157
158 int c;
159 while ((c = getopt_long(argc, argv, "", opts, nullptr)) != -1) {
160 switch (c) {
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 }
166 }
167
168 CHECK(android::vold::sBlkidContext != nullptr);
169 CHECK(android::vold::sBlkidUntrustedContext != nullptr);
170 CHECK(android::vold::sFsckContext != nullptr);
171 CHECK(android::vold::sFsckUntrustedContext != nullptr);
172 }
173
do_coldboot(DIR * d,int lvl)174 static void do_coldboot(DIR *d, int lvl) {
175 struct dirent *de;
176 int dfd, fd;
177
178 dfd = dirfd(d);
179
180 fd = openat(dfd, "uevent", O_WRONLY | O_CLOEXEC);
181 if(fd >= 0) {
182 write(fd, "add\n", 4);
183 close(fd);
184 }
185
186 while((de = readdir(d))) {
187 DIR *d2;
188
189 if (de->d_name[0] == '.')
190 continue;
191
192 if (de->d_type != DT_DIR && lvl > 0)
193 continue;
194
195 fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
196 if(fd < 0)
197 continue;
198
199 d2 = fdopendir(fd);
200 if(d2 == 0)
201 close(fd);
202 else {
203 do_coldboot(d2, lvl + 1);
204 closedir(d2);
205 }
206 }
207 }
208
coldboot(const char * path)209 static void coldboot(const char *path) {
210 DIR *d = opendir(path);
211 if(d) {
212 do_coldboot(d, 0);
213 closedir(d);
214 }
215 }
216
process_config(VolumeManager * vm,bool * has_adoptable)217 static int process_config(VolumeManager *vm, bool* has_adoptable) {
218 fstab = fs_mgr_read_fstab_default();
219 if (!fstab) {
220 PLOG(ERROR) << "Failed to open default fstab";
221 return -1;
222 }
223
224 /* Loop through entries looking for ones that vold manages */
225 *has_adoptable = false;
226 for (int i = 0; i < fstab->num_entries; i++) {
227 if (fs_mgr_is_voldmanaged(&fstab->recs[i])) {
228 if (fs_mgr_is_nonremovable(&fstab->recs[i])) {
229 LOG(WARNING) << "nonremovable no longer supported; ignoring volume";
230 continue;
231 }
232
233 std::string sysPattern(fstab->recs[i].blk_device);
234 std::string nickname(fstab->recs[i].label);
235 int flags = 0;
236
237 if (fs_mgr_is_encryptable(&fstab->recs[i])) {
238 flags |= android::vold::Disk::Flags::kAdoptable;
239 *has_adoptable = true;
240 }
241 if (fs_mgr_is_noemulatedsd(&fstab->recs[i])
242 || property_get_bool("vold.debug.default_primary", false)) {
243 flags |= android::vold::Disk::Flags::kDefaultPrimary;
244 }
245
246 vm->addDiskSource(std::shared_ptr<VolumeManager::DiskSource>(
247 new VolumeManager::DiskSource(sysPattern, nickname, flags)));
248 }
249 }
250 return 0;
251 }
252