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);
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     if (process_config(vm)) {
110         PLOG(ERROR) << "Error reading configuration... continuing anyways";
111     }
112 
113     if (nm->start()) {
114         PLOG(ERROR) << "Unable to start NetlinkManager";
115         exit(1);
116     }
117 
118     coldboot("/sys/block");
119 //    coldboot("/sys/class/switch");
120 
121     /*
122      * Now that we're up, we can respond to commands
123      */
124     if (cl->startListener()) {
125         PLOG(ERROR) << "Unable to start CommandListener";
126         exit(1);
127     }
128 
129     if (ccl->startListener()) {
130         PLOG(ERROR) << "Unable to start CryptCommandListener";
131         exit(1);
132     }
133 
134     // Eventually we'll become the monitoring thread
135     while(1) {
136         sleep(1000);
137     }
138 
139     LOG(ERROR) << "Vold exiting";
140     exit(0);
141 }
142 
parse_args(int argc,char ** argv)143 static void parse_args(int argc, char** argv) {
144     static struct option opts[] = {
145         {"blkid_context", required_argument, 0, 'b' },
146         {"blkid_untrusted_context", required_argument, 0, 'B' },
147         {"fsck_context", required_argument, 0, 'f' },
148         {"fsck_untrusted_context", required_argument, 0, 'F' },
149     };
150 
151     int c;
152     while ((c = getopt_long(argc, argv, "", opts, nullptr)) != -1) {
153         switch (c) {
154         case 'b': android::vold::sBlkidContext = optarg; break;
155         case 'B': android::vold::sBlkidUntrustedContext = optarg; break;
156         case 'f': android::vold::sFsckContext = optarg; break;
157         case 'F': android::vold::sFsckUntrustedContext = optarg; break;
158         }
159     }
160 
161     CHECK(android::vold::sBlkidContext != nullptr);
162     CHECK(android::vold::sBlkidUntrustedContext != nullptr);
163     CHECK(android::vold::sFsckContext != nullptr);
164     CHECK(android::vold::sFsckUntrustedContext != nullptr);
165 }
166 
do_coldboot(DIR * d,int lvl)167 static void do_coldboot(DIR *d, int lvl) {
168     struct dirent *de;
169     int dfd, fd;
170 
171     dfd = dirfd(d);
172 
173     fd = openat(dfd, "uevent", O_WRONLY | O_CLOEXEC);
174     if(fd >= 0) {
175         write(fd, "add\n", 4);
176         close(fd);
177     }
178 
179     while((de = readdir(d))) {
180         DIR *d2;
181 
182         if (de->d_name[0] == '.')
183             continue;
184 
185         if (de->d_type != DT_DIR && lvl > 0)
186             continue;
187 
188         fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY);
189         if(fd < 0)
190             continue;
191 
192         d2 = fdopendir(fd);
193         if(d2 == 0)
194             close(fd);
195         else {
196             do_coldboot(d2, lvl + 1);
197             closedir(d2);
198         }
199     }
200 }
201 
coldboot(const char * path)202 static void coldboot(const char *path) {
203     DIR *d = opendir(path);
204     if(d) {
205         do_coldboot(d, 0);
206         closedir(d);
207     }
208 }
209 
process_config(VolumeManager * vm)210 static int process_config(VolumeManager *vm) {
211     std::string path(android::vold::DefaultFstabPath());
212     fstab = fs_mgr_read_fstab(path.c_str());
213     if (!fstab) {
214         PLOG(ERROR) << "Failed to open default fstab " << path;
215         return -1;
216     }
217 
218     /* Loop through entries looking for ones that vold manages */
219     bool has_adoptable = false;
220     for (int i = 0; i < fstab->num_entries; i++) {
221         if (fs_mgr_is_voldmanaged(&fstab->recs[i])) {
222             if (fs_mgr_is_nonremovable(&fstab->recs[i])) {
223                 LOG(WARNING) << "nonremovable no longer supported; ignoring volume";
224                 continue;
225             }
226 
227             std::string sysPattern(fstab->recs[i].blk_device);
228             std::string nickname(fstab->recs[i].label);
229             int flags = 0;
230 
231             if (fs_mgr_is_encryptable(&fstab->recs[i])) {
232                 flags |= android::vold::Disk::Flags::kAdoptable;
233                 has_adoptable = true;
234             }
235             if (fs_mgr_is_noemulatedsd(&fstab->recs[i])
236                     || property_get_bool("vold.debug.default_primary", false)) {
237                 flags |= android::vold::Disk::Flags::kDefaultPrimary;
238             }
239 
240             vm->addDiskSource(std::shared_ptr<VolumeManager::DiskSource>(
241                     new VolumeManager::DiskSource(sysPattern, nickname, flags)));
242         }
243     }
244     property_set("vold.has_adoptable", has_adoptable ? "1" : "0");
245     return 0;
246 }
247