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main.cpp
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main.cpp
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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "Disk.h"
#include "VolumeManager.h"
#include "CommandListener.h"
#include "CryptCommandListener.h"
#include "NetlinkManager.h"
#include "cryptfs.h"
#include "sehandle.h"
#include <base/logging.h>
#include <base/stringprintf.h>
#include <cutils/klog.h>
#include <cutils/properties.h>
#include <cutils/sockets.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <getopt.h>
#include <fcntl.h>
#include <dirent.h>
#include <fs_mgr.h>
static int process_config(VolumeManager *vm);
static void coldboot(const char *path);
static void parse_args(int argc, char** argv);
struct fstab *fstab;
struct selabel_handle *sehandle;
using android::base::StringPrintf;
int main(int argc, char** argv) {
setenv("ANDROID_LOG_TAGS", "*:v", 1);
android::base::InitLogging(argv, android::base::LogdLogger(android::base::SYSTEM));
LOG(INFO) << "Vold 3.0 (the awakening) firing up";
LOG(VERBOSE) << "Detected support for:"
<< (android::vold::IsFilesystemSupported("exfat") ? " exfat" : "")
<< (android::vold::IsFilesystemSupported("ext4") ? " ext4" : "")
<< (android::vold::IsFilesystemSupported("f2fs") ? " f2fs" : "")
<< (android::vold::IsFilesystemSupported("ntfs") ? " ntfs" : "")
<< (android::vold::IsFilesystemSupported("vfat") ? " vfat" : "");
VolumeManager *vm;
CommandListener *cl;
CryptCommandListener *ccl;
NetlinkManager *nm;
parse_args(argc, argv);
sehandle = selinux_android_file_context_handle();
if (sehandle) {
selinux_android_set_sehandle(sehandle);
}
// Quickly throw a CLOEXEC on the socket we just inherited from init
fcntl(android_get_control_socket("vold"), F_SETFD, FD_CLOEXEC);
fcntl(android_get_control_socket("cryptd"), F_SETFD, FD_CLOEXEC);
mkdir("/dev/block/vold", 0755);
/* For when cryptfs checks and mounts an encrypted filesystem */
klog_set_level(6);
/* Create our singleton managers */
if (!(vm = VolumeManager::Instance())) {
LOG(ERROR) << "Unable to create VolumeManager";
exit(1);
}
if (!(nm = NetlinkManager::Instance())) {
LOG(ERROR) << "Unable to create NetlinkManager";
exit(1);
}
if (property_get_bool("vold.debug", false)) {
vm->setDebug(true);
}
cl = new CommandListener();
ccl = new CryptCommandListener();
vm->setBroadcaster((SocketListener *) cl);
nm->setBroadcaster((SocketListener *) cl);
if (vm->start()) {
PLOG(ERROR) << "Unable to start VolumeManager";
exit(1);
}
if (process_config(vm)) {
PLOG(ERROR) << "Error reading configuration... continuing anyways";
}
if (nm->start()) {
PLOG(ERROR) << "Unable to start NetlinkManager";
exit(1);
}
coldboot("/sys/block");
// coldboot("/sys/class/switch");
/*
* Now that we're up, we can respond to commands
*/
if (cl->startListener()) {
PLOG(ERROR) << "Unable to start CommandListener";
exit(1);
}
if (ccl->startListener()) {
PLOG(ERROR) << "Unable to start CryptCommandListener";
exit(1);
}
// Eventually we'll become the monitoring thread
while(1) {
sleep(1000);
}
LOG(ERROR) << "Vold exiting";
exit(0);
}
static void parse_args(int argc, char** argv) {
static struct option opts[] = {
{"blkid_context", required_argument, 0, 'b' },
{"blkid_untrusted_context", required_argument, 0, 'B' },
{"fsck_context", required_argument, 0, 'f' },
{"fsck_untrusted_context", required_argument, 0, 'F' },
};
int c;
while ((c = getopt_long(argc, argv, "", opts, nullptr)) != -1) {
switch (c) {
case 'b': android::vold::sBlkidContext = optarg; break;
case 'B': android::vold::sBlkidUntrustedContext = optarg; break;
case 'f': android::vold::sFsckContext = optarg; break;
case 'F': android::vold::sFsckUntrustedContext = optarg; break;
}
}
CHECK(android::vold::sBlkidContext != nullptr);
CHECK(android::vold::sBlkidUntrustedContext != nullptr);
CHECK(android::vold::sFsckContext != nullptr);
CHECK(android::vold::sFsckUntrustedContext != nullptr);
}
static void do_coldboot(DIR *d, int lvl) {
struct dirent *de;
int dfd, fd;
dfd = dirfd(d);
fd = openat(dfd, "uevent", O_WRONLY | O_CLOEXEC);
if(fd >= 0) {
write(fd, "add\n", 4);
close(fd);
}
while((de = readdir(d))) {
DIR *d2;
if (de->d_name[0] == '.')
continue;
if (de->d_type != DT_DIR && lvl > 0)
continue;
fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY);
if(fd < 0)
continue;
d2 = fdopendir(fd);
if(d2 == 0)
close(fd);
else {
do_coldboot(d2, lvl + 1);
closedir(d2);
}
}
}
static void coldboot(const char *path) {
DIR *d = opendir(path);
if(d) {
do_coldboot(d, 0);
closedir(d);
}
}
static int process_config(VolumeManager *vm) {
std::string path(android::vold::DefaultFstabPath());
fstab = fs_mgr_read_fstab(path.c_str());
if (!fstab) {
PLOG(ERROR) << "Failed to open default fstab " << path;
return -1;
}
/* Loop through entries looking for ones that vold manages */
bool has_adoptable = false;
for (int i = 0; i < fstab->num_entries; i++) {
if (fs_mgr_is_voldmanaged(&fstab->recs[i])) {
std::string sysPattern(fstab->recs[i].blk_device);
std::string fstype;
if (fstab->recs[i].fs_type) {
fstype = fstab->recs[i].fs_type;
}
std::string mntopts;
if (fstab->recs[i].fs_options) {
mntopts = fstab->recs[i].fs_options;
}
std::string nickname(fstab->recs[i].label);
int partnum = fstab->recs[i].partnum;
int flags = 0;
if (fs_mgr_is_encryptable(&fstab->recs[i])) {
flags |= android::vold::Disk::Flags::kAdoptable;
has_adoptable = true;
}
if (fs_mgr_is_noemulatedsd(&fstab->recs[i])
|| property_get_bool("vold.debug.default_primary", false)) {
flags |= android::vold::Disk::Flags::kDefaultPrimary;
}
if (fs_mgr_is_nonremovable(&fstab->recs[i])) {
flags |= android::vold::Disk::Flags::kNonRemovable;
}
vm->addDiskSource(std::shared_ptr<VolumeManager::DiskSource>(
new VolumeManager::DiskSource(sysPattern, nickname, partnum, flags,
fstype, mntopts)));
}
}
property_set("vold.has_adoptable", has_adoptable ? "1" : "0");
return 0;
}