/*
* Copyright (C) 2017 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 <array>
#include "adbconnection.h"
#include "android-base/endian.h"
#include "android-base/stringprintf.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/mutex.h"
#include "java_vm_ext.h"
#include "jni_env_ext.h"
#include "mirror/throwable.h"
#include "nativehelper/ScopedLocalRef.h"
#include "runtime-inl.h"
#include "runtime_callbacks.h"
#include "scoped_thread_state_change-inl.h"
#include "well_known_classes.h"
#include "jdwp/jdwp_priv.h"
#include "fd_transport.h"
#include "poll.h"
#ifdef ART_TARGET_ANDROID
#include "cutils/sockets.h"
#endif
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/eventfd.h>
#include <jni.h>
namespace adbconnection {
// Messages sent from the transport
using dt_fd_forward::kListenStartMessage;
using dt_fd_forward::kListenEndMessage;
using dt_fd_forward::kAcceptMessage;
using dt_fd_forward::kCloseMessage;
// Messages sent to the transport
using dt_fd_forward::kPerformHandshakeMessage;
using dt_fd_forward::kSkipHandshakeMessage;
using android::base::StringPrintf;
static constexpr const char kJdwpHandshake[14] = {
'J', 'D', 'W', 'P', '-', 'H', 'a', 'n', 'd', 's', 'h', 'a', 'k', 'e'
};
static constexpr int kEventfdLocked = 0;
static constexpr int kEventfdUnlocked = 1;
static constexpr int kControlSockSendTimeout = 10;
static constexpr size_t kPacketHeaderLen = 11;
static constexpr off_t kPacketSizeOff = 0;
static constexpr off_t kPacketIdOff = 4;
static constexpr off_t kPacketCommandSetOff = 9;
static constexpr off_t kPacketCommandOff = 10;
static constexpr uint8_t kDdmCommandSet = 199;
static constexpr uint8_t kDdmChunkCommand = 1;
static AdbConnectionState* gState;
static bool IsDebuggingPossible() {
return art::Dbg::IsJdwpAllowed();
}
// Begin running the debugger.
void AdbConnectionDebuggerController::StartDebugger() {
if (IsDebuggingPossible()) {
connection_->StartDebuggerThreads();
} else {
LOG(ERROR) << "Not starting debugger since process cannot load the jdwp agent.";
}
}
// The debugger should begin shutting down since the runtime is ending. We don't actually do
// anything here. The real shutdown has already happened as far as the agent is concerned.
void AdbConnectionDebuggerController::StopDebugger() { }
bool AdbConnectionDebuggerController::IsDebuggerConfigured() {
return IsDebuggingPossible() && !art::Runtime::Current()->GetJdwpOptions().empty();
}
void AdbConnectionDdmCallback::DdmPublishChunk(uint32_t type,
const art::ArrayRef<const uint8_t>& data) {
connection_->PublishDdmData(type, data);
}
class ScopedEventFdLock {
public:
explicit ScopedEventFdLock(int fd) : fd_(fd), data_(0) {
TEMP_FAILURE_RETRY(read(fd_, &data_, sizeof(data_)));
}
~ScopedEventFdLock() {
TEMP_FAILURE_RETRY(write(fd_, &data_, sizeof(data_)));
}
private:
int fd_;
uint64_t data_;
};
AdbConnectionState::AdbConnectionState(const std::string& agent_name)
: agent_name_(agent_name),
controller_(this),
ddm_callback_(this),
sleep_event_fd_(-1),
control_sock_(-1),
local_agent_control_sock_(-1),
remote_agent_control_sock_(-1),
adb_connection_socket_(-1),
adb_write_event_fd_(-1),
shutting_down_(false),
agent_loaded_(false),
agent_listening_(false),
agent_has_socket_(false),
sent_agent_fds_(false),
performed_handshake_(false),
notified_ddm_active_(false),
next_ddm_id_(1),
started_debugger_threads_(false) {
// Setup the addr.
control_addr_.controlAddrUn.sun_family = AF_UNIX;
control_addr_len_ = sizeof(control_addr_.controlAddrUn.sun_family) + sizeof(kJdwpControlName) - 1;
memcpy(control_addr_.controlAddrUn.sun_path, kJdwpControlName, sizeof(kJdwpControlName) - 1);
// Add the startup callback.
art::ScopedObjectAccess soa(art::Thread::Current());
art::Runtime::Current()->GetRuntimeCallbacks()->AddDebuggerControlCallback(&controller_);
}
static jobject CreateAdbConnectionThread(art::Thread* thr) {
JNIEnv* env = thr->GetJniEnv();
// Move to native state to talk with the jnienv api.
art::ScopedThreadStateChange stsc(thr, art::kNative);
ScopedLocalRef<jstring> thr_name(env, env->NewStringUTF(kAdbConnectionThreadName));
ScopedLocalRef<jobject> thr_group(
env,
env->GetStaticObjectField(art::WellKnownClasses::java_lang_ThreadGroup,
art::WellKnownClasses::java_lang_ThreadGroup_systemThreadGroup));
return env->NewObject(art::WellKnownClasses::java_lang_Thread,
art::WellKnownClasses::java_lang_Thread_init,
thr_group.get(),
thr_name.get(),
/*Priority*/ 0,
/*Daemon*/ true);
}
struct CallbackData {
AdbConnectionState* this_;
jobject thr_;
};
static void* CallbackFunction(void* vdata) {
std::unique_ptr<CallbackData> data(reinterpret_cast<CallbackData*>(vdata));
CHECK(data->this_ == gState);
art::Thread* self = art::Thread::Attach(kAdbConnectionThreadName,
true,
data->thr_);
CHECK(self != nullptr) << "threads_being_born_ should have ensured thread could be attached.";
// The name in Attach() is only for logging. Set the thread name. This is important so
// that the thread is no longer seen as starting up.
{
art::ScopedObjectAccess soa(self);
self->SetThreadName(kAdbConnectionThreadName);
}
// Release the peer.
JNIEnv* env = self->GetJniEnv();
env->DeleteGlobalRef(data->thr_);
data->thr_ = nullptr;
{
// The StartThreadBirth was called in the parent thread. We let the runtime know we are up
// before going into the provided code.
art::MutexLock mu(self, *art::Locks::runtime_shutdown_lock_);
art::Runtime::Current()->EndThreadBirth();
}
data->this_->RunPollLoop(self);
int detach_result = art::Runtime::Current()->GetJavaVM()->DetachCurrentThread();
CHECK_EQ(detach_result, 0);
// Get rid of the connection
gState = nullptr;
delete data->this_;
return nullptr;
}
void AdbConnectionState::StartDebuggerThreads() {
// First do all the final setup we need.
CHECK_EQ(adb_write_event_fd_.get(), -1);
CHECK_EQ(sleep_event_fd_.get(), -1);
CHECK_EQ(local_agent_control_sock_.get(), -1);
CHECK_EQ(remote_agent_control_sock_.get(), -1);
sleep_event_fd_.reset(eventfd(kEventfdLocked, EFD_CLOEXEC));
CHECK_NE(sleep_event_fd_.get(), -1) << "Unable to create wakeup eventfd.";
adb_write_event_fd_.reset(eventfd(kEventfdUnlocked, EFD_CLOEXEC));
CHECK_NE(adb_write_event_fd_.get(), -1) << "Unable to create write-lock eventfd.";
{
art::ScopedObjectAccess soa(art::Thread::Current());
art::Runtime::Current()->GetRuntimeCallbacks()->AddDdmCallback(&ddm_callback_);
}
// Setup the socketpair we use to talk to the agent.
bool has_sockets;
do {
has_sockets = android::base::Socketpair(AF_UNIX,
SOCK_SEQPACKET | SOCK_CLOEXEC,
0,
&local_agent_control_sock_,
&remote_agent_control_sock_);
} while (!has_sockets && errno == EINTR);
if (!has_sockets) {
PLOG(FATAL) << "Unable to create socketpair for agent control!";
}
// Next start the threads.
art::Thread* self = art::Thread::Current();
art::ScopedObjectAccess soa(self);
{
art::Runtime* runtime = art::Runtime::Current();
art::MutexLock mu(self, *art::Locks::runtime_shutdown_lock_);
if (runtime->IsShuttingDownLocked()) {
// The runtime is shutting down so we cannot create new threads. This shouldn't really happen.
LOG(ERROR) << "The runtime is shutting down when we are trying to start up the debugger!";
return;
}
runtime->StartThreadBirth();
}
ScopedLocalRef<jobject> thr(soa.Env(), CreateAdbConnectionThread(soa.Self()));
pthread_t pthread;
std::unique_ptr<CallbackData> data(new CallbackData { this, soa.Env()->NewGlobalRef(thr.get()) });
started_debugger_threads_ = true;
int pthread_create_result = pthread_create(&pthread,
nullptr,
&CallbackFunction,
data.get());
if (pthread_create_result != 0) {
started_debugger_threads_ = false;
// If the create succeeded the other thread will call EndThreadBirth.
art::Runtime* runtime = art::Runtime::Current();
soa.Env()->DeleteGlobalRef(data->thr_);
LOG(ERROR) << "Failed to create thread for adb-jdwp connection manager!";
art::MutexLock mu(art::Thread::Current(), *art::Locks::runtime_shutdown_lock_);
runtime->EndThreadBirth();
return;
}
data.release();
}
static bool FlagsSet(int16_t data, int16_t flags) {
return (data & flags) == flags;
}
void AdbConnectionState::CloseFds() {
{
// Lock the write_event_fd so that concurrent PublishDdms will see that the connection is
// closed.
ScopedEventFdLock lk(adb_write_event_fd_);
// shutdown(adb_connection_socket_, SHUT_RDWR);
adb_connection_socket_.reset();
}
// If we didn't load anything we will need to do the handshake again.
performed_handshake_ = false;
// If the agent isn't loaded we might need to tell ddms code the connection is closed.
if (!agent_loaded_ && notified_ddm_active_) {
NotifyDdms(/*active*/false);
}
}
void AdbConnectionState::NotifyDdms(bool active) {
art::ScopedObjectAccess soa(art::Thread::Current());
DCHECK_NE(notified_ddm_active_, active);
notified_ddm_active_ = active;
if (active) {
art::Dbg::DdmConnected();
} else {
art::Dbg::DdmDisconnected();
}
}
uint32_t AdbConnectionState::NextDdmId() {
// Just have a normal counter but always set the sign bit.
return (next_ddm_id_++) | 0x80000000;
}
void AdbConnectionState::PublishDdmData(uint32_t type, const art::ArrayRef<const uint8_t>& data) {
SendDdmPacket(NextDdmId(), DdmPacketType::kCmd, type, data);
}
void AdbConnectionState::SendDdmPacket(uint32_t id,
DdmPacketType packet_type,
uint32_t type,
art::ArrayRef<const uint8_t> data) {
// Get the write_event early to fail fast.
ScopedEventFdLock lk(adb_write_event_fd_);
if (adb_connection_socket_ == -1) {
VLOG(jdwp) << "Not sending ddms data of type "
<< StringPrintf("%c%c%c%c",
static_cast<char>(type >> 24),
static_cast<char>(type >> 16),
static_cast<char>(type >> 8),
static_cast<char>(type)) << " due to no connection!";
// Adb is not connected.
return;
}
// the adb_write_event_fd_ will ensure that the adb_connection_socket_ will not go away until
// after we have sent our data.
static constexpr uint32_t kDdmPacketHeaderSize =
kJDWPHeaderLen // jdwp command packet size
+ sizeof(uint32_t) // Type
+ sizeof(uint32_t); // length
alignas(sizeof(uint32_t)) std::array<uint8_t, kDdmPacketHeaderSize> pkt;
uint8_t* pkt_data = pkt.data();
// Write the length first.
*reinterpret_cast<uint32_t*>(pkt_data) = htonl(kDdmPacketHeaderSize + data.size());
pkt_data += sizeof(uint32_t);
// Write the id next;
*reinterpret_cast<uint32_t*>(pkt_data) = htonl(id);
pkt_data += sizeof(uint32_t);
// next the flags. (0 for cmd packet because DDMS).
*(pkt_data++) = static_cast<uint8_t>(packet_type);
switch (packet_type) {
case DdmPacketType::kCmd: {
// Now the cmd-set
*(pkt_data++) = kJDWPDdmCmdSet;
// Now the command
*(pkt_data++) = kJDWPDdmCmd;
break;
}
case DdmPacketType::kReply: {
// This is the error code bytes which are all 0
*(pkt_data++) = 0;
*(pkt_data++) = 0;
}
}
// These are at unaligned addresses so we need to do them manually.
// now the type.
uint32_t net_type = htonl(type);
memcpy(pkt_data, &net_type, sizeof(net_type));
pkt_data += sizeof(uint32_t);
// Now the data.size()
uint32_t net_len = htonl(data.size());
memcpy(pkt_data, &net_len, sizeof(net_len));
pkt_data += sizeof(uint32_t);
static uint32_t constexpr kIovSize = 2;
struct iovec iovs[kIovSize] = {
{ pkt.data(), pkt.size() },
{ const_cast<uint8_t*>(data.data()), data.size() },
};
// now pkt_header has the header.
// use writev to send the actual data.
ssize_t res = TEMP_FAILURE_RETRY(writev(adb_connection_socket_, iovs, kIovSize));
if (static_cast<size_t>(res) != (kDdmPacketHeaderSize + data.size())) {
PLOG(ERROR) << StringPrintf("Failed to send DDMS packet %c%c%c%c to debugger (%zd of %zu)",
static_cast<char>(type >> 24),
static_cast<char>(type >> 16),
static_cast<char>(type >> 8),
static_cast<char>(type),
res, data.size() + kDdmPacketHeaderSize);
} else {
VLOG(jdwp) << StringPrintf("sent DDMS packet %c%c%c%c to debugger %zu",
static_cast<char>(type >> 24),
static_cast<char>(type >> 16),
static_cast<char>(type >> 8),
static_cast<char>(type),
data.size() + kDdmPacketHeaderSize);
}
}
void AdbConnectionState::SendAgentFds(bool require_handshake) {
DCHECK(!sent_agent_fds_);
const char* message = require_handshake ? kPerformHandshakeMessage : kSkipHandshakeMessage;
union {
cmsghdr cm;
char buffer[CMSG_SPACE(dt_fd_forward::FdSet::kDataLength)];
} cm_un;
iovec iov;
iov.iov_base = const_cast<char*>(message);
iov.iov_len = strlen(message) + 1;
msghdr msg;
msg.msg_name = nullptr;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_flags = 0;
msg.msg_control = cm_un.buffer;
msg.msg_controllen = sizeof(cm_un.buffer);
cmsghdr* cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(dt_fd_forward::FdSet::kDataLength);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
// Duplicate the fds before sending them.
android::base::unique_fd read_fd(dup(adb_connection_socket_));
CHECK_NE(read_fd.get(), -1) << "Failed to dup read_fd_: " << strerror(errno);
android::base::unique_fd write_fd(dup(adb_connection_socket_));
CHECK_NE(write_fd.get(), -1) << "Failed to dup write_fd: " << strerror(errno);
android::base::unique_fd write_lock_fd(dup(adb_write_event_fd_));
CHECK_NE(write_lock_fd.get(), -1) << "Failed to dup write_lock_fd: " << strerror(errno);
dt_fd_forward::FdSet {
read_fd.get(), write_fd.get(), write_lock_fd.get()
}.WriteData(CMSG_DATA(cmsg));
int res = TEMP_FAILURE_RETRY(sendmsg(local_agent_control_sock_, &msg, MSG_EOR));
if (res < 0) {
PLOG(ERROR) << "Failed to send agent adb connection fds.";
} else {
sent_agent_fds_ = true;
VLOG(jdwp) << "Fds have been sent to jdwp agent!";
}
}
android::base::unique_fd AdbConnectionState::ReadFdFromAdb() {
// We don't actually care about the data that is sent. We do need to receive something though.
char dummy = '!';
union {
cmsghdr cm;
char buffer[CMSG_SPACE(sizeof(int))];
} cm_un;
iovec iov;
iov.iov_base = &dummy;
iov.iov_len = 1;
msghdr msg;
msg.msg_name = nullptr;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_flags = 0;
msg.msg_control = cm_un.buffer;
msg.msg_controllen = sizeof(cm_un.buffer);
cmsghdr* cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = msg.msg_controllen;
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
(reinterpret_cast<int*>(CMSG_DATA(cmsg)))[0] = -1;
int rc = TEMP_FAILURE_RETRY(recvmsg(control_sock_, &msg, 0));
if (rc <= 0) {
PLOG(WARNING) << "Receiving file descriptor from ADB failed (socket " << control_sock_ << ")";
return android::base::unique_fd(-1);
} else {
VLOG(jdwp) << "Fds have been received from ADB!";
}
return android::base::unique_fd((reinterpret_cast<int*>(CMSG_DATA(cmsg)))[0]);
}
bool AdbConnectionState::SetupAdbConnection() {
int sleep_ms = 500;
const int sleep_max_ms = 2*1000;
android::base::unique_fd sock(socket(AF_UNIX, SOCK_SEQPACKET, 0));
if (sock < 0) {
PLOG(ERROR) << "Could not create ADB control socket";
return false;
}
struct timeval timeout;
timeout.tv_sec = kControlSockSendTimeout;
timeout.tv_usec = 0;
setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout));
int32_t pid = getpid();
while (!shutting_down_) {
// If adbd isn't running, because USB debugging was disabled or
// perhaps the system is restarting it for "adb root", the
// connect() will fail. We loop here forever waiting for it
// to come back.
//
// Waking up and polling every couple of seconds is generally a
// bad thing to do, but we only do this if the application is
// debuggable *and* adbd isn't running. Still, for the sake
// of battery life, we should consider timing out and giving
// up after a few minutes in case somebody ships an app with
// the debuggable flag set.
int ret = connect(sock, &control_addr_.controlAddrPlain, control_addr_len_);
if (ret == 0) {
bool trusted = sock >= 0;
#ifdef ART_TARGET_ANDROID
// Needed for socket_peer_is_trusted.
trusted = trusted && socket_peer_is_trusted(sock);
#endif
if (!trusted) {
LOG(ERROR) << "adb socket is not trusted. Aborting connection.";
if (sock >= 0 && shutdown(sock, SHUT_RDWR)) {
PLOG(ERROR) << "trouble shutting down socket";
}
return false;
}
/* now try to send our pid to the ADB daemon */
ret = TEMP_FAILURE_RETRY(send(sock, &pid, sizeof(pid), 0));
if (ret == sizeof(pid)) {
VLOG(jdwp) << "PID " << pid << " sent to adb";
control_sock_ = std::move(sock);
return true;
} else {
PLOG(ERROR) << "Weird, can't send JDWP process pid to ADB. Aborting connection.";
return false;
}
} else {
if (VLOG_IS_ON(jdwp)) {
PLOG(ERROR) << "Can't connect to ADB control socket. Will retry.";
}
usleep(sleep_ms * 1000);
sleep_ms += (sleep_ms >> 1);
if (sleep_ms > sleep_max_ms) {
sleep_ms = sleep_max_ms;
}
}
}
return false;
}
void AdbConnectionState::RunPollLoop(art::Thread* self) {
CHECK_NE(agent_name_, "");
CHECK_EQ(self->GetState(), art::kNative);
// TODO: Clang prebuilt for r316199 produces bogus thread safety analysis warning for holding both
// exclusive and shared lock in the same scope. Remove the assertion as a temporary workaround.
// http://b/71769596
// art::Locks::mutator_lock_->AssertNotHeld(self);
self->SetState(art::kWaitingInMainDebuggerLoop);
// shutting_down_ set by StopDebuggerThreads
while (!shutting_down_) {
// First get the control_sock_ from adb if we don't have one. We only need to do this once.
if (control_sock_ == -1 && !SetupAdbConnection()) {
LOG(ERROR) << "Failed to setup adb connection.";
return;
}
while (!shutting_down_ && control_sock_ != -1) {
bool should_listen_on_connection = !agent_has_socket_ && !sent_agent_fds_;
struct pollfd pollfds[4] = {
{ sleep_event_fd_, POLLIN, 0 },
// -1 as an fd causes it to be ignored by poll
{ (agent_loaded_ ? local_agent_control_sock_ : -1), POLLIN, 0 },
// Check for the control_sock_ actually going away. Only do this if we don't have an active
// connection.
{ (adb_connection_socket_ == -1 ? control_sock_ : -1), POLLIN | POLLRDHUP, 0 },
// if we have not loaded the agent either the adb_connection_socket_ is -1 meaning we don't
// have a real connection yet or the socket through adb needs to be listened to for incoming
// data that the agent or this plugin can handle.
{ should_listen_on_connection ? adb_connection_socket_ : -1, POLLIN | POLLRDHUP, 0 }
};
int res = TEMP_FAILURE_RETRY(poll(pollfds, 4, -1));
if (res < 0) {
PLOG(ERROR) << "Failed to poll!";
return;
}
// We don't actually care about doing this we just use it to wake us up.
// const struct pollfd& sleep_event_poll = pollfds[0];
const struct pollfd& agent_control_sock_poll = pollfds[1];
const struct pollfd& control_sock_poll = pollfds[2];
const struct pollfd& adb_socket_poll = pollfds[3];
if (FlagsSet(agent_control_sock_poll.revents, POLLIN)) {
DCHECK(agent_loaded_);
char buf[257];
res = TEMP_FAILURE_RETRY(recv(local_agent_control_sock_, buf, sizeof(buf) - 1, 0));
if (res < 0) {
PLOG(ERROR) << "Failed to read message from agent control socket! Retrying";
continue;
} else {
buf[res + 1] = '\0';
VLOG(jdwp) << "Local agent control sock has data: " << static_cast<const char*>(buf);
}
if (memcmp(kListenStartMessage, buf, sizeof(kListenStartMessage)) == 0) {
agent_listening_ = true;
if (adb_connection_socket_ != -1) {
SendAgentFds(/*require_handshake*/ !performed_handshake_);
}
} else if (memcmp(kListenEndMessage, buf, sizeof(kListenEndMessage)) == 0) {
agent_listening_ = false;
} else if (memcmp(kCloseMessage, buf, sizeof(kCloseMessage)) == 0) {
CloseFds();
agent_has_socket_ = false;
} else if (memcmp(kAcceptMessage, buf, sizeof(kAcceptMessage)) == 0) {
agent_has_socket_ = true;
sent_agent_fds_ = false;
// We will only ever do the handshake once so reset this.
performed_handshake_ = false;
} else {
LOG(ERROR) << "Unknown message received from debugger! '" << std::string(buf) << "'";
}
} else if (FlagsSet(control_sock_poll.revents, POLLIN)) {
bool maybe_send_fds = false;
{
// Hold onto this lock so that concurrent ddm publishes don't try to use an illegal fd.
ScopedEventFdLock sefdl(adb_write_event_fd_);
android::base::unique_fd new_fd(ReadFdFromAdb());
if (new_fd == -1) {
// Something went wrong. We need to retry getting the control socket.
PLOG(ERROR) << "Something went wrong getting fds from adb. Retry!";
control_sock_.reset();
break;
} else if (adb_connection_socket_ != -1) {
// We already have a connection.
VLOG(jdwp) << "Ignoring second debugger. Accept then drop!";
if (new_fd >= 0) {
new_fd.reset();
}
} else {
VLOG(jdwp) << "Adb connection established with fd " << new_fd;
adb_connection_socket_ = std::move(new_fd);
maybe_send_fds = true;
}
}
if (maybe_send_fds && agent_loaded_ && agent_listening_) {
VLOG(jdwp) << "Sending fds as soon as we received them.";
// The agent was already loaded so this must be after a disconnection. Therefore have the
// transport perform the handshake.
SendAgentFds(/*require_handshake*/ true);
}
} else if (FlagsSet(control_sock_poll.revents, POLLRDHUP)) {
// The other end of the adb connection just dropped it.
// Reset the connection since we don't have an active socket through the adb server.
DCHECK(!agent_has_socket_) << "We shouldn't be doing anything if there is already a "
<< "connection active";
control_sock_.reset();
break;
} else if (FlagsSet(adb_socket_poll.revents, POLLIN)) {
DCHECK(!agent_has_socket_);
if (!agent_loaded_) {
HandleDataWithoutAgent(self);
} else if (agent_listening_ && !sent_agent_fds_) {
VLOG(jdwp) << "Sending agent fds again on data.";
// Agent was already loaded so it can deal with the handshake.
SendAgentFds(/*require_handshake*/ true);
}
} else if (FlagsSet(adb_socket_poll.revents, POLLRDHUP)) {
DCHECK(!agent_has_socket_);
CloseFds();
} else {
VLOG(jdwp) << "Woke up poll without anything to do!";
}
}
}
}
static uint32_t ReadUint32AndAdvance(/*in-out*/uint8_t** in) {
uint32_t res;
memcpy(&res, *in, sizeof(uint32_t));
*in = (*in) + sizeof(uint32_t);
return ntohl(res);
}
void AdbConnectionState::HandleDataWithoutAgent(art::Thread* self) {
DCHECK(!agent_loaded_);
DCHECK(!agent_listening_);
// TODO Should we check in some other way if we are userdebug/eng?
CHECK(art::Dbg::IsJdwpAllowed());
// We try to avoid loading the agent which is expensive. First lets just perform the handshake.
if (!performed_handshake_) {
PerformHandshake();
return;
}
// Read the packet header to figure out if it is one we can handle. We only 'peek' into the stream
// to see if it's one we can handle. This doesn't change the state of the socket.
alignas(sizeof(uint32_t)) uint8_t packet_header[kPacketHeaderLen];
ssize_t res = TEMP_FAILURE_RETRY(recv(adb_connection_socket_.get(),
packet_header,
sizeof(packet_header),
MSG_PEEK));
// We want to be very careful not to change the socket state until we know we succeeded. This will
// let us fall-back to just loading the agent and letting it deal with everything.
if (res <= 0) {
// Close the socket. We either hit EOF or an error.
if (res < 0) {
PLOG(ERROR) << "Unable to peek into adb socket due to error. Closing socket.";
}
CloseFds();
return;
} else if (res < static_cast<int>(kPacketHeaderLen)) {
LOG(ERROR) << "Unable to peek into adb socket. Loading agent to handle this. Only read " << res;
AttachJdwpAgent(self);
return;
}
uint32_t full_len = ntohl(*reinterpret_cast<uint32_t*>(packet_header + kPacketSizeOff));
uint32_t pkt_id = ntohl(*reinterpret_cast<uint32_t*>(packet_header + kPacketIdOff));
uint8_t pkt_cmd_set = packet_header[kPacketCommandSetOff];
uint8_t pkt_cmd = packet_header[kPacketCommandOff];
if (pkt_cmd_set != kDdmCommandSet ||
pkt_cmd != kDdmChunkCommand ||
full_len < kPacketHeaderLen) {
VLOG(jdwp) << "Loading agent due to jdwp packet that cannot be handled by adbconnection.";
AttachJdwpAgent(self);
return;
}
uint32_t avail = -1;
res = TEMP_FAILURE_RETRY(ioctl(adb_connection_socket_.get(), FIONREAD, &avail));
if (res < 0) {
PLOG(ERROR) << "Failed to determine amount of readable data in socket! Closing connection";
CloseFds();
return;
} else if (avail < full_len) {
LOG(WARNING) << "Unable to handle ddm command in adbconnection due to insufficent data. "
<< "Expected " << full_len << " bytes but only " << avail << " are readable. "
<< "Loading jdwp agent to deal with this.";
AttachJdwpAgent(self);
return;
}
// Actually read the data.
std::vector<uint8_t> full_pkt;
full_pkt.resize(full_len);
res = TEMP_FAILURE_RETRY(recv(adb_connection_socket_.get(), full_pkt.data(), full_len, 0));
if (res < 0) {
PLOG(ERROR) << "Failed to recv data from adb connection. Closing connection";
CloseFds();
return;
}
DCHECK_EQ(memcmp(full_pkt.data(), packet_header, sizeof(packet_header)), 0);
size_t data_size = full_len - kPacketHeaderLen;
if (data_size < (sizeof(uint32_t) * 2)) {
// This is an error (the data isn't long enough) but to match historical behavior we need to
// ignore it.
return;
}
uint8_t* ddm_data = full_pkt.data() + kPacketHeaderLen;
uint32_t ddm_type = ReadUint32AndAdvance(&ddm_data);
uint32_t ddm_len = ReadUint32AndAdvance(&ddm_data);
if (ddm_len > data_size - (2 * sizeof(uint32_t))) {
// This is an error (the data isn't long enough) but to match historical behavior we need to
// ignore it.
return;
}
if (!notified_ddm_active_) {
NotifyDdms(/*active*/ true);
}
uint32_t reply_type;
std::vector<uint8_t> reply;
if (!art::Dbg::DdmHandleChunk(self->GetJniEnv(),
ddm_type,
art::ArrayRef<const jbyte>(reinterpret_cast<const jbyte*>(ddm_data),
ddm_len),
/*out*/&reply_type,
/*out*/&reply)) {
// To match historical behavior we don't send any response when there is no data to reply with.
return;
}
SendDdmPacket(pkt_id,
DdmPacketType::kReply,
reply_type,
art::ArrayRef<const uint8_t>(reply));
}
void AdbConnectionState::PerformHandshake() {
CHECK(!performed_handshake_);
// Check to make sure we are able to read the whole handshake.
uint32_t avail = -1;
int res = TEMP_FAILURE_RETRY(ioctl(adb_connection_socket_.get(), FIONREAD, &avail));
if (res < 0 || avail < sizeof(kJdwpHandshake)) {
if (res < 0) {
PLOG(ERROR) << "Failed to determine amount of readable data for handshake!";
}
LOG(WARNING) << "Closing connection to broken client.";
CloseFds();
return;
}
// Perform the handshake.
char handshake_msg[sizeof(kJdwpHandshake)];
res = TEMP_FAILURE_RETRY(recv(adb_connection_socket_.get(),
handshake_msg,
sizeof(handshake_msg),
MSG_DONTWAIT));
if (res < static_cast<int>(sizeof(kJdwpHandshake)) ||
strncmp(handshake_msg, kJdwpHandshake, sizeof(kJdwpHandshake)) != 0) {
if (res < 0) {
PLOG(ERROR) << "Failed to read handshake!";
}
LOG(WARNING) << "Handshake failed!";
CloseFds();
return;
}
// Send the handshake back.
res = TEMP_FAILURE_RETRY(send(adb_connection_socket_.get(),
kJdwpHandshake,
sizeof(kJdwpHandshake),
0));
if (res < static_cast<int>(sizeof(kJdwpHandshake))) {
PLOG(ERROR) << "Failed to send jdwp-handshake response.";
CloseFds();
return;
}
performed_handshake_ = true;
}
void AdbConnectionState::AttachJdwpAgent(art::Thread* self) {
art::Runtime* runtime = art::Runtime::Current();
self->AssertNoPendingException();
runtime->AttachAgent(/* JNIEnv */ nullptr,
MakeAgentArg(),
/* classloader */ nullptr);
if (self->IsExceptionPending()) {
LOG(ERROR) << "Failed to load agent " << agent_name_;
art::ScopedObjectAccess soa(self);
self->GetException()->Dump();
self->ClearException();
return;
}
agent_loaded_ = true;
}
bool ContainsArgument(const std::string& opts, const char* arg) {
return opts.find(arg) != std::string::npos;
}
bool ValidateJdwpOptions(const std::string& opts) {
bool res = true;
// The adbconnection plugin requires that the jdwp agent be configured as a 'server' because that
// is what adb expects and otherwise we will hit a deadlock as the poll loop thread stops waiting
// for the fd's to be passed down.
if (ContainsArgument(opts, "server=n")) {
res = false;
LOG(ERROR) << "Cannot start jdwp debugging with server=n from adbconnection.";
}
// We don't start the jdwp agent until threads are already running. It is far too late to suspend
// everything.
if (ContainsArgument(opts, "suspend=y")) {
res = false;
LOG(ERROR) << "Cannot use suspend=y with late-init jdwp.";
}
return res;
}
std::string AdbConnectionState::MakeAgentArg() {
const std::string& opts = art::Runtime::Current()->GetJdwpOptions();
DCHECK(ValidateJdwpOptions(opts));
// TODO Get agent_name_ from something user settable?
return agent_name_ + "=" + opts + (opts.empty() ? "" : ",") +
"ddm_already_active=" + (notified_ddm_active_ ? "y" : "n") + "," +
// See the comment above for why we need to be server=y. Since the agent defaults to server=n
// we will add it if it wasn't already present for the convenience of the user.
(ContainsArgument(opts, "server=y") ? "" : "server=y,") +
// See the comment above for why we need to be suspend=n. Since the agent defaults to
// suspend=y we will add it if it wasn't already present.
(ContainsArgument(opts, "suspend=n") ? "" : "suspend=n") +
"transport=dt_fd_forward,address=" + std::to_string(remote_agent_control_sock_);
}
void AdbConnectionState::StopDebuggerThreads() {
// The regular agent system will take care of unloading the agent (if needed).
shutting_down_ = true;
// Wakeup the poll loop.
uint64_t data = 1;
if (sleep_event_fd_ != -1) {
TEMP_FAILURE_RETRY(write(sleep_event_fd_, &data, sizeof(data)));
}
}
// The plugin initialization function.
extern "C" bool ArtPlugin_Initialize() REQUIRES_SHARED(art::Locks::mutator_lock_) {
DCHECK(art::Runtime::Current()->GetJdwpProvider() == art::JdwpProvider::kAdbConnection);
// TODO Provide some way for apps to set this maybe?
DCHECK(gState == nullptr);
gState = new AdbConnectionState(kDefaultJdwpAgentName);
return ValidateJdwpOptions(art::Runtime::Current()->GetJdwpOptions());
}
extern "C" bool ArtPlugin_Deinitialize() {
gState->StopDebuggerThreads();
if (!gState->DebuggerThreadsStarted()) {
// If debugger threads were started then those threads will delete the state once they are done.
delete gState;
}
return true;
}
} // namespace adbconnection