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/*
* Copyright (C) 2007 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 TRANSPORT
#include "sysdeps.h"
#include "transport.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <condition_variable>
#include <mutex>
#include <thread>
#include <vector>
#include <android-base/parsenetaddress.h>
#include <android-base/stringprintf.h>
#include <cutils/sockets.h>
#if !ADB_HOST
#include <android-base/properties.h>
#endif
#include "adb.h"
#include "adb_io.h"
#include "adb_utils.h"
#include "sysdeps/chrono.h"
#if ADB_HOST
// Android Wear has been using port 5601 in all of its documentation/tooling,
// but we search for emulators on ports [5554, 5555 + ADB_LOCAL_TRANSPORT_MAX].
// Avoid stomping on their port by limiting the number of emulators that can be
// connected.
#define ADB_LOCAL_TRANSPORT_MAX 16
static std::mutex& local_transports_lock = *new std::mutex();
/* we keep a list of opened transports. The atransport struct knows to which
* local transport it is connected. The list is used to detect when we're
* trying to connect twice to a given local transport.
*/
static atransport* local_transports[ ADB_LOCAL_TRANSPORT_MAX ];
#endif /* ADB_HOST */
static int remote_read(apacket *p, atransport *t)
{
if(!ReadFdExactly(t->sfd, &p->msg, sizeof(amessage))){
D("remote local: read terminated (message)");
return -1;
}
if(check_header(p, t)) {
D("bad header: terminated (data)");
return -1;
}
if(!ReadFdExactly(t->sfd, p->data, p->msg.data_length)){
D("remote local: terminated (data)");
return -1;
}
if(check_data(p)) {
D("bad data: terminated (data)");
return -1;
}
return 0;
}
static int remote_write(apacket *p, atransport *t)
{
int length = p->msg.data_length;
if(!WriteFdExactly(t->sfd, &p->msg, sizeof(amessage) + length)) {
D("remote local: write terminated");
return -1;
}
return 0;
}
bool local_connect(int port) {
std::string dummy;
return local_connect_arbitrary_ports(port-1, port, &dummy) == 0;
}
void connect_device(const std::string& address, std::string* response) {
if (address.empty()) {
*response = "empty address";
return;
}
std::string serial;
std::string host;
int port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT;
if (!android::base::ParseNetAddress(address, &host, &port, &serial, response)) {
return;
}
std::string error;
int fd = network_connect(host.c_str(), port, SOCK_STREAM, 10, &error);
if (fd == -1) {
*response = android::base::StringPrintf("unable to connect to %s: %s",
serial.c_str(), error.c_str());
return;
}
D("client: connected %s remote on fd %d", serial.c_str(), fd);
close_on_exec(fd);
disable_tcp_nagle(fd);
// Send a TCP keepalive ping to the device every second so we can detect disconnects.
if (!set_tcp_keepalive(fd, 1)) {
D("warning: failed to configure TCP keepalives (%s)", strerror(errno));
}
int ret = register_socket_transport(fd, serial.c_str(), port, 0);
if (ret < 0) {
adb_close(fd);
*response = android::base::StringPrintf("already connected to %s", serial.c_str());
} else {
*response = android::base::StringPrintf("connected to %s", serial.c_str());
}
}
int local_connect_arbitrary_ports(int console_port, int adb_port, std::string* error) {
int fd = -1;
#if ADB_HOST
if (find_emulator_transport_by_adb_port(adb_port) != nullptr ||
find_emulator_transport_by_console_port(console_port) != nullptr) {
return -1;
}
const char *host = getenv("ADBHOST");
if (host) {
fd = network_connect(host, adb_port, SOCK_STREAM, 0, error);
}
#endif
if (fd < 0) {
fd = network_loopback_client(adb_port, SOCK_STREAM, error);
}
if (fd >= 0) {
D("client: connected on remote on fd %d", fd);
close_on_exec(fd);
disable_tcp_nagle(fd);
std::string serial = getEmulatorSerialString(console_port);
if (register_socket_transport(fd, serial.c_str(), adb_port, 1) == 0) {
return 0;
}
adb_close(fd);
}
return -1;
}
#if ADB_HOST
static void PollAllLocalPortsForEmulator() {
int port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT;
int count = ADB_LOCAL_TRANSPORT_MAX;
// Try to connect to any number of running emulator instances.
for ( ; count > 0; count--, port += 2 ) {
local_connect(port);
}
}
// Retry the disconnected local port for 60 times, and sleep 1 second between two retries.
constexpr uint32_t LOCAL_PORT_RETRY_COUNT = 60;
constexpr auto LOCAL_PORT_RETRY_INTERVAL = 1s;
struct RetryPort {
int port;
uint32_t retry_count;
};
// Retry emulators just kicked.
static std::vector<RetryPort>& retry_ports = *new std::vector<RetryPort>;
std::mutex &retry_ports_lock = *new std::mutex;
std::condition_variable &retry_ports_cond = *new std::condition_variable;
static void client_socket_thread(int) {
adb_thread_setname("client_socket_thread");
D("transport: client_socket_thread() starting");
PollAllLocalPortsForEmulator();
while (true) {
std::vector<RetryPort> ports;
// Collect retry ports.
{
std::unique_lock<std::mutex> lock(retry_ports_lock);
while (retry_ports.empty()) {
retry_ports_cond.wait(lock);
}
retry_ports.swap(ports);
}
// Sleep here instead of the end of loop, because if we immediately try to reconnect
// the emulator just kicked, the adbd on the emulator may not have time to remove the
// just kicked transport.
std::this_thread::sleep_for(LOCAL_PORT_RETRY_INTERVAL);
// Try connecting retry ports.
std::vector<RetryPort> next_ports;
for (auto& port : ports) {
VLOG(TRANSPORT) << "retry port " << port.port << ", last retry_count "
<< port.retry_count;
if (local_connect(port.port)) {
VLOG(TRANSPORT) << "retry port " << port.port << " successfully";
continue;
}
if (--port.retry_count > 0) {
next_ports.push_back(port);
} else {
VLOG(TRANSPORT) << "stop retrying port " << port.port;
}
}
// Copy back left retry ports.
{
std::unique_lock<std::mutex> lock(retry_ports_lock);
retry_ports.insert(retry_ports.end(), next_ports.begin(), next_ports.end());
}
}
}
#else // ADB_HOST
static void server_socket_thread(int port) {
int serverfd, fd;
adb_thread_setname("server socket");
D("transport: server_socket_thread() starting");
serverfd = -1;
for(;;) {
if(serverfd == -1) {
std::string error;
serverfd = network_inaddr_any_server(port, SOCK_STREAM, &error);
if(serverfd < 0) {
D("server: cannot bind socket yet: %s", error.c_str());
std::this_thread::sleep_for(1s);
continue;
}
close_on_exec(serverfd);
}
D("server: trying to get new connection from %d", port);
fd = adb_socket_accept(serverfd, nullptr, nullptr);
if(fd >= 0) {
D("server: new connection on fd %d", fd);
close_on_exec(fd);
disable_tcp_nagle(fd);
std::string serial = android::base::StringPrintf("host-%d", fd);
if (register_socket_transport(fd, serial.c_str(), port, 1) != 0) {
adb_close(fd);
}
}
}
D("transport: server_socket_thread() exiting");
}
/* This is relevant only for ADB daemon running inside the emulator. */
/*
* Redefine open and write for qemu_pipe.h that contains inlined references
* to those routines. We will redefine them back after qemu_pipe.h inclusion.
*/
#undef open
#undef read
#undef write
#define open adb_open
#define read adb_read
#define write adb_write
#include <system/qemu_pipe.h>
#undef open
#undef read
#undef write
#define open ___xxx_open
#define read ___xxx_read
#define write ___xxx_write
/* A worker thread that monitors host connections, and registers a transport for
* every new host connection. This thread replaces server_socket_thread on
* condition that adbd daemon runs inside the emulator, and emulator uses QEMUD
* pipe to communicate with adbd daemon inside the guest. This is done in order
* to provide more robust communication channel between ADB host and guest. The
* main issue with server_socket_thread approach is that it runs on top of TCP,
* and thus is sensitive to network disruptions. For instance, the
* ConnectionManager may decide to reset all network connections, in which case
* the connection between ADB host and guest will be lost. To make ADB traffic
* independent from the network, we use here 'adb' QEMUD service to transfer data
* between the host, and the guest. See external/qemu/android/adb-*.* that
* implements the emulator's side of the protocol. Another advantage of using
* QEMUD approach is that ADB will be up much sooner, since it doesn't depend
* anymore on network being set up.
* The guest side of the protocol contains the following phases:
* - Connect with adb QEMUD service. In this phase a handle to 'adb' QEMUD service
* is opened, and it becomes clear whether or not emulator supports that
* protocol.
* - Wait for the ADB host to create connection with the guest. This is done by
* sending an 'accept' request to the adb QEMUD service, and waiting on
* response.
* - When new ADB host connection is accepted, the connection with adb QEMUD
* service is registered as the transport, and a 'start' request is sent to the
* adb QEMUD service, indicating that the guest is ready to receive messages.
* Note that the guest will ignore messages sent down from the emulator before
* the transport registration is completed. That's why we need to send the
* 'start' request after the transport is registered.
*/
static void qemu_socket_thread(int port) {
/* 'accept' request to the adb QEMUD service. */
static const char _accept_req[] = "accept";
/* 'start' request to the adb QEMUD service. */
static const char _start_req[] = "start";
/* 'ok' reply from the adb QEMUD service. */
static const char _ok_resp[] = "ok";
int fd;
char tmp[256];
char con_name[32];
adb_thread_setname("qemu socket");
D("transport: qemu_socket_thread() starting");
/* adb QEMUD service connection request. */
snprintf(con_name, sizeof(con_name), "pipe:qemud:adb:%d", port);
/* Connect to the adb QEMUD service. */
fd = qemu_pipe_open(con_name);
if (fd < 0) {
/* This could be an older version of the emulator, that doesn't
* implement adb QEMUD service. Fall back to the old TCP way. */
D("adb service is not available. Falling back to TCP socket.");
std::thread(server_socket_thread, port).detach();
return;
}
for(;;) {
/*
* Wait till the host creates a new connection.
*/
/* Send the 'accept' request. */
if (WriteFdExactly(fd, _accept_req, strlen(_accept_req))) {
/* Wait for the response. In the response we expect 'ok' on success,
* or 'ko' on failure. */
if (!ReadFdExactly(fd, tmp, 2) || memcmp(tmp, _ok_resp, 2)) {
D("Accepting ADB host connection has failed.");
adb_close(fd);
} else {
/* Host is connected. Register the transport, and start the
* exchange. */
std::string serial = android::base::StringPrintf("host-%d", fd);
if (register_socket_transport(fd, serial.c_str(), port, 1) != 0 ||
!WriteFdExactly(fd, _start_req, strlen(_start_req))) {
adb_close(fd);
}
}
/* Prepare for accepting of the next ADB host connection. */
fd = qemu_pipe_open(con_name);
if (fd < 0) {
D("adb service become unavailable.");
return;
}
} else {
D("Unable to send the '%s' request to ADB service.", _accept_req);
return;
}
}
D("transport: qemu_socket_thread() exiting");
return;
}
#endif // !ADB_HOST
void local_init(int port)
{
void (*func)(int);
const char* debug_name = "";
#if ADB_HOST
func = client_socket_thread;
debug_name = "client";
#else
// For the adbd daemon in the system image we need to distinguish
// between the device, and the emulator.
if (android::base::GetBoolProperty("ro.kernel.qemu", false)) {
// Running inside the emulator: use QEMUD pipe as the transport.
func = qemu_socket_thread;
} else {
// Running inside the device: use TCP socket as the transport.
func = server_socket_thread;
}
debug_name = "server";
#endif // !ADB_HOST
D("transport: local %s init", debug_name);
std::thread(func, port).detach();
}
static void remote_kick(atransport *t)
{
int fd = t->sfd;
t->sfd = -1;
adb_shutdown(fd);
adb_close(fd);
#if ADB_HOST
int nn;
std::lock_guard<std::mutex> lock(local_transports_lock);
for (nn = 0; nn < ADB_LOCAL_TRANSPORT_MAX; nn++) {
if (local_transports[nn] == t) {
local_transports[nn] = NULL;
break;
}
}
#endif
}
static void remote_close(atransport *t)
{
int fd = t->sfd;
if (fd != -1) {
t->sfd = -1;
adb_close(fd);
}
#if ADB_HOST
int local_port;
if (t->GetLocalPortForEmulator(&local_port)) {
VLOG(TRANSPORT) << "remote_close, local_port = " << local_port;
std::unique_lock<std::mutex> lock(retry_ports_lock);
RetryPort port;
port.port = local_port;
port.retry_count = LOCAL_PORT_RETRY_COUNT;
retry_ports.push_back(port);
retry_ports_cond.notify_one();
}
#endif
}
#if ADB_HOST
/* Only call this function if you already hold local_transports_lock. */
static atransport* find_emulator_transport_by_adb_port_locked(int adb_port)
{
int i;
for (i = 0; i < ADB_LOCAL_TRANSPORT_MAX; i++) {
int local_port;
if (local_transports[i] && local_transports[i]->GetLocalPortForEmulator(&local_port)) {
if (local_port == adb_port) {
return local_transports[i];
}
}
}
return NULL;
}
std::string getEmulatorSerialString(int console_port)
{
return android::base::StringPrintf("emulator-%d", console_port);
}
atransport* find_emulator_transport_by_adb_port(int adb_port)
{
std::lock_guard<std::mutex> lock(local_transports_lock);
atransport* result = find_emulator_transport_by_adb_port_locked(adb_port);
return result;
}
atransport* find_emulator_transport_by_console_port(int console_port)
{
return find_transport(getEmulatorSerialString(console_port).c_str());
}
/* Only call this function if you already hold local_transports_lock. */
int get_available_local_transport_index_locked()
{
int i;
for (i = 0; i < ADB_LOCAL_TRANSPORT_MAX; i++) {
if (local_transports[i] == NULL) {
return i;
}
}
return -1;
}
int get_available_local_transport_index()
{
std::lock_guard<std::mutex> lock(local_transports_lock);
int result = get_available_local_transport_index_locked();
return result;
}
#endif
int init_socket_transport(atransport *t, int s, int adb_port, int local)
{
int fail = 0;
t->SetKickFunction(remote_kick);
t->SetWriteFunction(remote_write);
t->close = remote_close;
t->read_from_remote = remote_read;
t->sfd = s;
t->sync_token = 1;
t->type = kTransportLocal;
#if ADB_HOST
if (local) {
std::lock_guard<std::mutex> lock(local_transports_lock);
t->SetLocalPortForEmulator(adb_port);
atransport* existing_transport = find_emulator_transport_by_adb_port_locked(adb_port);
int index = get_available_local_transport_index_locked();
if (existing_transport != NULL) {
D("local transport for port %d already registered (%p)?", adb_port, existing_transport);
fail = -1;
} else if (index < 0) {
// Too many emulators.
D("cannot register more emulators. Maximum is %d", ADB_LOCAL_TRANSPORT_MAX);
fail = -1;
} else {
local_transports[index] = t;
}
}
#endif
return fail;
}