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
42static int process_config(VolumeManager *vm);
43static void coldboot(const char *path);
44static void parse_args(int argc, char** argv);
45
46struct fstab *fstab;
47
48struct selabel_handle *sehandle;
49
50using android::base::StringPrintf;
51
52int 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
143static 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
167static 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
202static void coldboot(const char *path) {
203    DIR *d = opendir(path);
204    if(d) {
205        do_coldboot(d, 0);
206        closedir(d);
207    }
208}
209
210static 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