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/*
* Copyright (C) 2018 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.
*/
#define TRACE_TAG SERVICES
#include "sysdeps.h"
#include <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <thread>
#include <android-base/file.h>
#include <android-base/parseint.h>
#include <android-base/parsenetaddress.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <android-base/unique_fd.h>
#include <cutils/sockets.h>
#include <log/log_properties.h>
#include "adb.h"
#include "adb_io.h"
#include "adb_unique_fd.h"
#include "adb_utils.h"
#include "services.h"
#include "socket_spec.h"
#include "sysdeps.h"
#include "transport.h"
#include "daemon/file_sync_service.h"
#include "daemon/framebuffer_service.h"
#include "daemon/reboot_service.h"
#include "daemon/remount_service.h"
#include "daemon/restart_service.h"
#include "daemon/set_verity_enable_state_service.h"
#include "daemon/shell_service.h"
void reconnect_service(unique_fd fd, atransport* t) {
WriteFdExactly(fd.get(), "done");
kick_transport(t);
}
unique_fd reverse_service(std::string_view command, atransport* transport) {
// TODO: Switch handle_forward_request to std::string_view.
std::string str(command);
int s[2];
if (adb_socketpair(s)) {
PLOG(ERROR) << "cannot create service socket pair.";
return unique_fd{};
}
VLOG(SERVICES) << "service socketpair: " << s[0] << ", " << s[1];
if (!handle_forward_request(str.c_str(), transport, s[1])) {
SendFail(s[1], "not a reverse forwarding command");
}
adb_close(s[1]);
return unique_fd{s[0]};
}
// Shell service string can look like:
// shell[,arg1,arg2,...]:[command]
unique_fd ShellService(std::string_view args, const atransport* transport) {
size_t delimiter_index = args.find(':');
if (delimiter_index == std::string::npos) {
LOG(ERROR) << "No ':' found in shell service arguments: " << args;
return unique_fd{};
}
// TODO: android::base::Split(const std::string_view&, ...)
std::string service_args(args.substr(0, delimiter_index));
std::string command(args.substr(delimiter_index + 1));
// Defaults:
// PTY for interactive, raw for non-interactive.
// No protocol.
// $TERM set to "dumb".
SubprocessType type(command.empty() ? SubprocessType::kPty : SubprocessType::kRaw);
SubprocessProtocol protocol = SubprocessProtocol::kNone;
std::string terminal_type = "dumb";
for (const std::string& arg : android::base::Split(service_args, ",")) {
if (arg == kShellServiceArgRaw) {
type = SubprocessType::kRaw;
} else if (arg == kShellServiceArgPty) {
type = SubprocessType::kPty;
} else if (arg == kShellServiceArgShellProtocol) {
protocol = SubprocessProtocol::kShell;
} else if (arg.starts_with("TERM=")) {
terminal_type = arg.substr(strlen("TERM="));
} else if (!arg.empty()) {
// This is not an error to allow for future expansion.
LOG(WARNING) << "Ignoring unknown shell service argument: " << arg;
}
}
return StartSubprocess(command, terminal_type.c_str(), type, protocol);
}
static void spin_service(unique_fd fd) {
if (!__android_log_is_debuggable()) {
WriteFdExactly(fd.get(), "refusing to spin on non-debuggable build\n");
return;
}
// A service that creates an fdevent that's always pending, and then ignores it.
unique_fd pipe_read, pipe_write;
if (!Pipe(&pipe_read, &pipe_write)) {
WriteFdExactly(fd.get(), "failed to create pipe\n");
return;
}
fdevent_run_on_main_thread([fd = pipe_read.release()]() {
fdevent* fde = fdevent_create(
fd, [](int, unsigned, void*) {}, nullptr);
fdevent_add(fde, FDE_READ);
});
WriteFdExactly(fd.get(), "spinning\n");
}
struct ServiceSocket : public asocket {
ServiceSocket() {
install_local_socket(this);
this->enqueue = [](asocket* self, apacket::payload_type data) {
return static_cast<ServiceSocket*>(self)->Enqueue(std::move(data));
};
this->ready = [](asocket* self) { return static_cast<ServiceSocket*>(self)->Ready(); };
this->close = [](asocket* self) { return static_cast<ServiceSocket*>(self)->Close(); };
}
virtual ~ServiceSocket() = default;
virtual int Enqueue(apacket::payload_type data) { return -1; }
virtual void Ready() {}
virtual void Close() {
if (peer) {
peer->peer = nullptr;
if (peer->shutdown) {
peer->shutdown(peer);
}
peer->close(peer);
}
remove_socket(this);
delete this;
}
};
struct SinkSocket : public ServiceSocket {
explicit SinkSocket(size_t byte_count) {
LOG(INFO) << "Creating new SinkSocket with capacity " << byte_count;
bytes_left_ = byte_count;
}
virtual ~SinkSocket() { LOG(INFO) << "SinkSocket destroyed"; }
virtual int Enqueue(apacket::payload_type data) override final {
if (bytes_left_ <= data.size()) {
// Done reading.
Close();
return -1;
}
bytes_left_ -= data.size();
return 0;
}
size_t bytes_left_;
};
struct SourceSocket : public ServiceSocket {
explicit SourceSocket(size_t byte_count) {
LOG(INFO) << "Creating new SourceSocket with capacity " << byte_count;
bytes_left_ = byte_count;
}
virtual ~SourceSocket() { LOG(INFO) << "SourceSocket destroyed"; }
void Ready() {
size_t len = std::min(bytes_left_, get_max_payload());
if (len == 0) {
Close();
return;
}
Block block(len);
memset(block.data(), 0, block.size());
peer->enqueue(peer, std::move(block));
bytes_left_ -= len;
}
int Enqueue(apacket::payload_type data) { return -1; }
size_t bytes_left_;
};
asocket* daemon_service_to_socket(std::string_view name) {
if (name == "jdwp") {
return create_jdwp_service_socket();
} else if (name == "track-jdwp") {
return create_jdwp_tracker_service_socket();
} else if (ConsumePrefix(&name, "sink:")) {
uint64_t byte_count = 0;
if (!ParseUint(&byte_count, name)) {
return nullptr;
}
return new SinkSocket(byte_count);
} else if (ConsumePrefix(&name, "source:")) {
uint64_t byte_count = 0;
if (!ParseUint(&byte_count, name)) {
return nullptr;
}
return new SourceSocket(byte_count);
}
return nullptr;
}
unique_fd daemon_service_to_fd(std::string_view name, atransport* transport) {
#if defined(__ANDROID__) && !defined(__ANDROID_RECOVERY__)
if (name.starts_with("abb:") || name.starts_with("abb_exec:")) {
return execute_abb_command(name);
}
#endif
#if defined(__ANDROID__)
if (name.starts_with("framebuffer:")) {
return create_service_thread("fb", framebuffer_service);
} else if (ConsumePrefix(&name, "remount:")) {
std::string arg(name);
return create_service_thread("remount",
std::bind(remount_service, std::placeholders::_1, arg));
} else if (ConsumePrefix(&name, "reboot:")) {
std::string arg(name);
return create_service_thread("reboot",
std::bind(reboot_service, std::placeholders::_1, arg));
} else if (name.starts_with("root:")) {
return create_service_thread("root", restart_root_service);
} else if (name.starts_with("unroot:")) {
return create_service_thread("unroot", restart_unroot_service);
} else if (ConsumePrefix(&name, "backup:")) {
std::string cmd = "/system/bin/bu backup ";
cmd += name;
return StartSubprocess(cmd, nullptr, SubprocessType::kRaw, SubprocessProtocol::kNone);
} else if (name.starts_with("restore:")) {
return StartSubprocess("/system/bin/bu restore", nullptr, SubprocessType::kRaw,
SubprocessProtocol::kNone);
} else if (name.starts_with("disable-verity:")) {
return create_service_thread("verity-on", std::bind(set_verity_enabled_state_service,
std::placeholders::_1, false));
} else if (name.starts_with("enable-verity:")) {
return create_service_thread("verity-off", std::bind(set_verity_enabled_state_service,
std::placeholders::_1, true));
} else if (ConsumePrefix(&name, "tcpip:")) {
std::string str(name);
int port;
if (sscanf(str.c_str(), "%d", &port) != 1) {
return unique_fd{};
}
return create_service_thread("tcp",
std::bind(restart_tcp_service, std::placeholders::_1, port));
} else if (name.starts_with("usb:")) {
return create_service_thread("usb", restart_usb_service);
}
#endif
if (ConsumePrefix(&name, "dev:")) {
return unique_fd{unix_open(name, O_RDWR | O_CLOEXEC)};
} else if (ConsumePrefix(&name, "jdwp:")) {
pid_t pid;
if (!ParseUint(&pid, name)) {
return unique_fd{};
}
return create_jdwp_connection_fd(pid);
} else if (ConsumePrefix(&name, "shell")) {
return ShellService(name, transport);
} else if (ConsumePrefix(&name, "exec:")) {
return StartSubprocess(std::string(name), nullptr, SubprocessType::kRaw,
SubprocessProtocol::kNone);
} else if (name.starts_with("sync:")) {
return create_service_thread("sync", file_sync_service);
} else if (ConsumePrefix(&name, "reverse:")) {
return reverse_service(name, transport);
} else if (name == "reconnect") {
return create_service_thread(
"reconnect", std::bind(reconnect_service, std::placeholders::_1, transport));
} else if (name == "spin") {
return create_service_thread("spin", spin_service);
}
return unique_fd{};
}