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adb.cpp
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adb.cpp
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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 ADB
#include "sysdeps.h"
#include "adb.h"
#include <ctype.h>
#include <errno.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#include <chrono>
#include <condition_variable>
#include <mutex>
#include <string>
#include <string_view>
#include <thread>
#include <vector>
#include <android-base/errors.h>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/macros.h>
#include <android-base/parsenetaddress.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <diagnose_usb.h>
#include <build/version.h>
#include <platform_tools_version.h>
#include "adb_auth.h"
#include "adb_io.h"
#include "adb_listeners.h"
#include "adb_mdns.h"
#include "adb_unique_fd.h"
#include "adb_utils.h"
#include "sysdeps/chrono.h"
#include "transport.h"
#if !ADB_HOST
#include <sys/capability.h>
#include <sys/mount.h>
#include <android-base/properties.h>
using namespace std::chrono_literals;
#include "daemon/logging.h"
#endif
#if ADB_HOST
#include "client/usb.h"
#endif
#if !ADB_HOST && defined(__ANDROID__)
#include "daemon/watchdog.h"
static std::atomic<int> active_connections = 0;
static void IncrementActiveConnections() {
if (active_connections++ == 0) {
watchdog::Stop();
}
}
static void DecrementActiveConnections() {
if (--active_connections == 0) {
watchdog::Start();
}
}
#endif
std::string adb_version() {
// Don't change the format of this --- it's parsed by ddmlib.
return android::base::StringPrintf(
"Android Debug Bridge version %d.%d.%d\n"
"Version %s-%s\n"
"Installed as %s\n",
ADB_VERSION_MAJOR, ADB_VERSION_MINOR, ADB_SERVER_VERSION,
PLATFORM_TOOLS_VERSION, android::build::GetBuildNumber().c_str(),
android::base::GetExecutablePath().c_str());
}
uint32_t calculate_apacket_checksum(const apacket* p) {
uint32_t sum = 0;
for (size_t i = 0; i < p->msg.data_length; ++i) {
sum += static_cast<uint8_t>(p->payload[i]);
}
return sum;
}
std::string to_string(ConnectionState state) {
switch (state) {
case kCsOffline:
return "offline";
case kCsBootloader:
return "bootloader";
case kCsDevice:
return "device";
case kCsHost:
return "host";
case kCsRecovery:
return "recovery";
case kCsRescue:
return "rescue";
case kCsNoPerm:
return UsbNoPermissionsShortHelpText();
case kCsSideload:
return "sideload";
case kCsUnauthorized:
return "unauthorized";
case kCsAuthorizing:
return "authorizing";
case kCsConnecting:
return "connecting";
default:
return "unknown";
}
}
apacket* get_apacket(void) {
apacket* p = new apacket();
if (p == nullptr) {
LOG(FATAL) << "failed to allocate an apacket";
}
memset(&p->msg, 0, sizeof(p->msg));
return p;
}
void put_apacket(apacket *p)
{
delete p;
}
void handle_online(atransport *t)
{
D("adb: online");
t->online = 1;
#if ADB_HOST
t->SetConnectionEstablished(true);
#elif defined(__ANDROID__)
IncrementActiveConnections();
#endif
}
void handle_offline(atransport *t)
{
if (t->GetConnectionState() == kCsOffline) {
LOG(INFO) << t->serial_name() << ": already offline";
return;
}
LOG(INFO) << t->serial_name() << ": offline";
#if !ADB_HOST && defined(__ANDROID__)
DecrementActiveConnections();
#endif
t->SetConnectionState(kCsOffline);
// Close the associated usb
t->online = 0;
// This is necessary to avoid a race condition that occurred when a transport closes
// while a client socket is still active.
close_all_sockets(t);
t->RunDisconnects();
}
#if DEBUG_PACKETS
#define DUMPMAX 32
void print_packet(const char *label, apacket *p)
{
const char* tag;
unsigned count;
switch(p->msg.command){
case A_SYNC: tag = "SYNC"; break;
case A_CNXN: tag = "CNXN" ; break;
case A_OPEN: tag = "OPEN"; break;
case A_OKAY: tag = "OKAY"; break;
case A_CLSE: tag = "CLSE"; break;
case A_WRTE: tag = "WRTE"; break;
case A_AUTH: tag = "AUTH"; break;
case A_STLS:
tag = "STLS";
break;
default: tag = "????"; break;
}
fprintf(stderr, "%s: %s %08x %08x %04x \"",
label, tag, p->msg.arg0, p->msg.arg1, p->msg.data_length);
count = p->msg.data_length;
const char* x = p->payload.data();
if (count > DUMPMAX) {
count = DUMPMAX;
tag = "\n";
} else {
tag = "\"\n";
}
while (count-- > 0) {
if ((*x >= ' ') && (*x < 127)) {
fputc(*x, stderr);
} else {
fputc('.', stderr);
}
x++;
}
fputs(tag, stderr);
}
#endif
void send_ready(unsigned local, unsigned remote, atransport* t, uint32_t ack_bytes) {
D("Calling send_ready");
apacket *p = get_apacket();
p->msg.command = A_OKAY;
p->msg.arg0 = local;
p->msg.arg1 = remote;
if (t->SupportsDelayedAck()) {
p->msg.data_length = sizeof(ack_bytes);
p->payload.resize(sizeof(ack_bytes));
memcpy(p->payload.data(), &ack_bytes, sizeof(ack_bytes));
}
send_packet(p, t);
}
static void send_close(unsigned local, unsigned remote, atransport *t)
{
D("Calling send_close");
apacket *p = get_apacket();
p->msg.command = A_CLSE;
p->msg.arg0 = local;
p->msg.arg1 = remote;
send_packet(p, t);
}
std::string get_connection_string() {
std::vector<std::string> connection_properties;
#if !ADB_HOST
static const char* cnxn_props[] = {
"ro.product.name",
"ro.product.model",
"ro.product.device",
};
for (const auto& prop : cnxn_props) {
std::string value = std::string(prop) + "=" + android::base::GetProperty(prop, "");
connection_properties.push_back(value);
}
#endif
connection_properties.push_back(android::base::StringPrintf(
"features=%s", FeatureSetToString(supported_features()).c_str()));
return android::base::StringPrintf(
"%s::%s", adb_device_banner,
android::base::Join(connection_properties, ';').c_str());
}
void send_tls_request(atransport* t) {
D("Calling send_tls_request");
apacket* p = get_apacket();
p->msg.command = A_STLS;
p->msg.arg0 = A_STLS_VERSION;
p->msg.data_length = 0;
send_packet(p, t);
}
void send_connect(atransport* t) {
D("Calling send_connect");
apacket* cp = get_apacket();
cp->msg.command = A_CNXN;
// Send the max supported version, but because the transport is
// initialized to A_VERSION_MIN, this will be compatible with every
// device.
cp->msg.arg0 = A_VERSION;
cp->msg.arg1 = t->get_max_payload();
std::string connection_str = get_connection_string();
// Connect and auth packets are limited to MAX_PAYLOAD_V1 because we don't
// yet know how much data the other size is willing to accept.
if (connection_str.length() > MAX_PAYLOAD_V1) {
LOG(FATAL) << "Connection banner is too long (length = "
<< connection_str.length() << ")";
}
cp->payload.assign(connection_str.begin(), connection_str.end());
cp->msg.data_length = cp->payload.size();
send_packet(cp, t);
}
void parse_banner(const std::string& banner, atransport* t) {
D("parse_banner: %s", banner.c_str());
// The format is something like:
// "device::ro.product.name=x;ro.product.model=y;ro.product.device=z;".
std::vector<std::string> pieces = android::base::Split(banner, ":");
// Reset the features list or else if the server sends no features we may
// keep the existing feature set (http://b/24405971).
t->SetFeatures("");
if (pieces.size() > 2) {
const std::string& props = pieces[2];
for (const auto& prop : android::base::Split(props, ";")) {
// The list of properties was traditionally ;-terminated rather than ;-separated.
if (prop.empty()) continue;
std::vector<std::string> key_value = android::base::Split(prop, "=");
if (key_value.size() != 2) continue;
const std::string& key = key_value[0];
const std::string& value = key_value[1];
if (key == "ro.product.name") {
t->product = value;
} else if (key == "ro.product.model") {
t->model = value;
} else if (key == "ro.product.device") {
t->device = value;
} else if (key == "features") {
t->SetFeatures(value);
}
}
}
const std::string& type = pieces[0];
if (type == "bootloader") {
D("setting connection_state to kCsBootloader");
t->SetConnectionState(kCsBootloader);
} else if (type == "device") {
D("setting connection_state to kCsDevice");
t->SetConnectionState(kCsDevice);
} else if (type == "recovery") {
D("setting connection_state to kCsRecovery");
t->SetConnectionState(kCsRecovery);
} else if (type == "sideload") {
D("setting connection_state to kCsSideload");
t->SetConnectionState(kCsSideload);
} else if (type == "rescue") {
D("setting connection_state to kCsRescue");
t->SetConnectionState(kCsRescue);
} else {
D("setting connection_state to kCsHost");
t->SetConnectionState(kCsHost);
}
}
static void handle_new_connection(atransport* t, apacket* p) {
handle_offline(t);
t->update_version(p->msg.arg0, p->msg.arg1);
std::string banner(p->payload.begin(), p->payload.end());
parse_banner(banner, t);
#if ADB_HOST
handle_online(t);
#else
ADB_LOG(Connection) << "received CNXN: version=" << p->msg.arg0 << ", maxdata = " << p->msg.arg1
<< ", banner = '" << banner << "'";
if (t->use_tls) {
// We still handshake in TLS mode. If auth_required is disabled,
// we'll just not verify the client's certificate. This should be the
// first packet the client receives to indicate the new protocol.
send_tls_request(t);
} else if (!auth_required) {
LOG(INFO) << "authentication not required";
handle_online(t);
send_connect(t);
} else {
send_auth_request(t);
}
#endif
update_transports();
}
void handle_packet(apacket *p, atransport *t)
{
D("handle_packet() %c%c%c%c", ((char*) (&(p->msg.command)))[0],
((char*) (&(p->msg.command)))[1],
((char*) (&(p->msg.command)))[2],
((char*) (&(p->msg.command)))[3]);
print_packet("recv", p);
CHECK_EQ(p->payload.size(), p->msg.data_length);
switch(p->msg.command){
case A_CNXN: // CONNECT(version, maxdata, "system-id-string")
handle_new_connection(t, p);
break;
case A_STLS: // TLS(version, "")
t->use_tls = true;
#if ADB_HOST
send_tls_request(t);
adb_auth_tls_handshake(t);
#else
adbd_auth_tls_handshake(t);
#endif
break;
case A_AUTH:
// All AUTH commands are ignored in TLS mode
if (t->use_tls) {
break;
}
switch (p->msg.arg0) {
#if ADB_HOST
case ADB_AUTH_TOKEN:
if (t->GetConnectionState() != kCsAuthorizing) {
t->SetConnectionState(kCsAuthorizing);
}
send_auth_response(p->payload.data(), p->msg.data_length, t);
break;
#else
case ADB_AUTH_SIGNATURE: {
// TODO: Switch to string_view.
std::string signature(p->payload.begin(), p->payload.end());
std::string auth_key;
if (adbd_auth_verify(t->token, sizeof(t->token), signature, &auth_key)) {
adbd_auth_verified(t);
t->failed_auth_attempts = 0;
t->auth_key = auth_key;
adbd_notify_framework_connected_key(t);
} else {
if (t->failed_auth_attempts++ > 256) std::this_thread::sleep_for(1s);
send_auth_request(t);
}
break;
}
case ADB_AUTH_RSAPUBLICKEY:
t->auth_key = std::string(p->payload.data());
adbd_auth_confirm_key(t);
break;
#endif
default:
t->SetConnectionState(kCsOffline);
handle_offline(t);
break;
}
break;
case A_OPEN: {
/* OPEN(local-id, [send-buffer], "destination") */
if (!t->online || p->msg.arg0 == 0) {
break;
}
uint32_t send_bytes = static_cast<uint32_t>(p->msg.arg1);
if (t->SupportsDelayedAck() != static_cast<bool>(send_bytes)) {
LOG(ERROR) << "unexpected value of A_OPEN arg1: " << send_bytes
<< " (delayed acks = " << t->SupportsDelayedAck() << ")";
send_close(0, p->msg.arg0, t);
break;
}
std::string_view address(p->payload.begin(), p->payload.size());
// Historically, we received service names as a char*, and stopped at the first NUL
// byte. The client sent strings with null termination, which post-string_view, start
// being interpreted as part of the string, unless we explicitly strip them.
address = StripTrailingNulls(address);
asocket* s = create_local_service_socket(address, t);
if (s == nullptr) {
send_close(0, p->msg.arg0, t);
break;
}
s->peer = create_remote_socket(p->msg.arg0, t);
s->peer->peer = s;
if (t->SupportsDelayedAck()) {
LOG(DEBUG) << "delayed ack available: send buffer = " << send_bytes;
s->available_send_bytes = send_bytes;
// TODO: Make this adjustable at connection time?
send_ready(s->id, s->peer->id, t, INITIAL_DELAYED_ACK_BYTES);
} else {
LOG(DEBUG) << "delayed ack unavailable";
send_ready(s->id, s->peer->id, t, 0);
}
s->ready(s);
break;
}
case A_OKAY: /* READY(local-id, remote-id, "") */
if (t->online && p->msg.arg0 != 0 && p->msg.arg1 != 0) {
asocket* s = find_local_socket(p->msg.arg1, 0);
if (s) {
std::optional<int32_t> acked_bytes;
if (p->payload.size() == sizeof(int32_t)) {
int32_t value;
memcpy(&value, p->payload.data(), sizeof(value));
// acked_bytes can be negative!
//
// In the future, we can use this to preemptively supply backpressure, instead
// of waiting for the writer to hit its limit.
acked_bytes = value;
} else if (p->payload.size() != 0) {
LOG(ERROR) << "invalid A_OKAY payload size: " << p->payload.size();
return;
}
if (s->peer == nullptr) {
/* On first READY message, create the connection. */
s->peer = create_remote_socket(p->msg.arg0, t);
s->peer->peer = s;
local_socket_ack(s, acked_bytes);
s->ready(s);
} else if (s->peer->id == p->msg.arg0) {
/* Other READY messages must use the same local-id */
local_socket_ack(s, acked_bytes);
} else {
D("Invalid A_OKAY(%d,%d), expected A_OKAY(%d,%d) on transport %s", p->msg.arg0,
p->msg.arg1, s->peer->id, p->msg.arg1, t->serial.c_str());
}
} else {
// When receiving A_OKAY from device for A_OPEN request, the host server may
// have closed the local socket because of client disconnection. Then we need
// to send A_CLSE back to device to close the service on device.
send_close(p->msg.arg1, p->msg.arg0, t);
}
}
break;
case A_CLSE: /* CLOSE(local-id, remote-id, "") or CLOSE(0, remote-id, "") */
if (t->online && p->msg.arg1 != 0) {
asocket* s = find_local_socket(p->msg.arg1, p->msg.arg0);
if (s) {
/* According to protocol.txt, p->msg.arg0 might be 0 to indicate
* a failed OPEN only. However, due to a bug in previous ADB
* versions, CLOSE(0, remote-id, "") was also used for normal
* CLOSE() operations.
*
* This is bad because it means a compromised adbd could
* send packets to close connections between the host and
* other devices. To avoid this, only allow this if the local
* socket has a peer on the same transport.
*/
if (p->msg.arg0 == 0 && s->peer && s->peer->transport != t) {
D("Invalid A_CLSE(0, %u) from transport %s, expected transport %s", p->msg.arg1,
t->serial.c_str(), s->peer->transport->serial.c_str());
} else {
s->close(s);
}
}
}
break;
case A_WRTE: /* WRITE(local-id, remote-id, <data>) */
if (t->online && p->msg.arg0 != 0 && p->msg.arg1 != 0) {
asocket* s = find_local_socket(p->msg.arg1, p->msg.arg0);
if (s) {
s->enqueue(s, std::move(p->payload));
}
}
break;
default:
printf("handle_packet: what is %08x?!\n", p->msg.command);
}
put_apacket(p);
}
#if ADB_HOST
#ifdef _WIN32
// Try to make a handle non-inheritable and if there is an error, don't output
// any error info, but leave GetLastError() for the caller to read. This is
// convenient if the caller is expecting that this may fail and they'd like to
// ignore such a failure.
static bool _try_make_handle_noninheritable(HANDLE h) {
if (h != INVALID_HANDLE_VALUE && h != NULL) {
return SetHandleInformation(h, HANDLE_FLAG_INHERIT, 0) ? true : false;
}
return true;
}
// Try to make a handle non-inheritable with the expectation that this should
// succeed, so if this fails, output error info.
static bool _make_handle_noninheritable(HANDLE h) {
if (!_try_make_handle_noninheritable(h)) {
// Show the handle value to give us a clue in case we have problems
// with pseudo-handle values.
fprintf(stderr, "adb: cannot make handle 0x%p non-inheritable: %s\n", h,
android::base::SystemErrorCodeToString(GetLastError()).c_str());
return false;
}
return true;
}
// Create anonymous pipe, preventing inheritance of the read pipe and setting
// security of the write pipe to sa.
static bool _create_anonymous_pipe(unique_handle* pipe_read_out,
unique_handle* pipe_write_out,
SECURITY_ATTRIBUTES* sa) {
HANDLE pipe_read_raw = NULL;
HANDLE pipe_write_raw = NULL;
if (!CreatePipe(&pipe_read_raw, &pipe_write_raw, sa, 0)) {
fprintf(stderr, "adb: CreatePipe failed: %s\n",
android::base::SystemErrorCodeToString(GetLastError()).c_str());
return false;
}
unique_handle pipe_read(pipe_read_raw);
pipe_read_raw = NULL;
unique_handle pipe_write(pipe_write_raw);
pipe_write_raw = NULL;
if (!_make_handle_noninheritable(pipe_read.get())) {
return false;
}
*pipe_read_out = std::move(pipe_read);
*pipe_write_out = std::move(pipe_write);
return true;
}
// Read from a pipe (that we take ownership of) and write the result to stdout/stderr. Return on
// error or when the pipe is closed. Internally makes inheritable handles, so this should not be
// called if subprocesses may be started concurrently.
static unsigned _redirect_pipe_thread(HANDLE h, DWORD nStdHandle) {
// Take ownership of the HANDLE and close when we're done.
unique_handle read_pipe(h);
const char* output_name = nStdHandle == STD_OUTPUT_HANDLE ? "stdout" : "stderr";
const int original_fd = fileno(nStdHandle == STD_OUTPUT_HANDLE ? stdout : stderr);
std::unique_ptr<FILE, decltype(&fclose)> stream(nullptr, fclose);
if (original_fd == -1) {
fprintf(stderr, "adb: failed to get file descriptor for %s: %s\n", output_name,
strerror(errno));
return EXIT_FAILURE;
}
// If fileno() is -2, stdout/stderr is not associated with an output stream, so we should read,
// but don't write. Otherwise, make a FILE* identical to stdout/stderr except that it is in
// binary mode with no CR/LR translation since we're reading raw.
if (original_fd >= 0) {
// This internally makes a duplicate file handle that is inheritable, so callers should not
// call this function if subprocesses may be started concurrently.
const int fd = dup(original_fd);
if (fd == -1) {
fprintf(stderr, "adb: failed to duplicate file descriptor for %s: %s\n", output_name,
strerror(errno));
return EXIT_FAILURE;
}
// Note that although we call fdopen() below with a binary flag, it may not adhere to that
// flag, so we have to set the mode manually.
if (_setmode(fd, _O_BINARY) == -1) {
fprintf(stderr, "adb: failed to set binary mode for duplicate of %s: %s\n", output_name,
strerror(errno));
unix_close(fd);
return EXIT_FAILURE;
}
stream.reset(fdopen(fd, "wb"));
if (stream.get() == nullptr) {
fprintf(stderr, "adb: failed to open duplicate stream for %s: %s\n", output_name,
strerror(errno));
unix_close(fd);
return EXIT_FAILURE;
}
// Unbuffer the stream because it will be buffered by default and we want subprocess output
// to be shown immediately.
if (setvbuf(stream.get(), NULL, _IONBF, 0) == -1) {
fprintf(stderr, "adb: failed to unbuffer %s: %s\n", output_name, strerror(errno));
return EXIT_FAILURE;
}
// fd will be closed when stream is closed.
}
while (true) {
char buf[64 * 1024];
DWORD bytes_read = 0;
if (!ReadFile(read_pipe.get(), buf, sizeof(buf), &bytes_read, NULL)) {
const DWORD err = GetLastError();
// ERROR_BROKEN_PIPE is expected when the subprocess closes
// the other end of the pipe.
if (err == ERROR_BROKEN_PIPE) {
return EXIT_SUCCESS;
} else {
fprintf(stderr, "adb: failed to read from %s: %s\n", output_name,
android::base::SystemErrorCodeToString(err).c_str());
return EXIT_FAILURE;
}
}
// Don't try to write if our stdout/stderr was not setup by the parent process.
if (stream) {
// fwrite() actually calls adb_fwrite() which can write UTF-8 to the console.
const size_t bytes_written = fwrite(buf, 1, bytes_read, stream.get());
if (bytes_written != bytes_read) {
fprintf(stderr, "adb: error: only wrote %zu of %lu bytes to %s\n", bytes_written,
bytes_read, output_name);
return EXIT_FAILURE;
}
}
}
}
static unsigned __stdcall _redirect_stdout_thread(HANDLE h) {
adb_thread_setname("stdout redirect");
return _redirect_pipe_thread(h, STD_OUTPUT_HANDLE);
}
static unsigned __stdcall _redirect_stderr_thread(HANDLE h) {
adb_thread_setname("stderr redirect");
return _redirect_pipe_thread(h, STD_ERROR_HANDLE);
}
#endif
static void ReportServerStartupFailure(pid_t pid) {
fprintf(stderr, "ADB server didn't ACK\n");
fprintf(stderr, "Full server startup log: %s\n", GetLogFilePath().c_str());
fprintf(stderr, "Server had pid: %d\n", pid);
android::base::unique_fd fd(unix_open(GetLogFilePath(), O_RDONLY));
if (fd == -1) return;
// Let's not show more than 128KiB of log...
unix_lseek(fd, -128 * 1024, SEEK_END);
std::string content;
if (!android::base::ReadFdToString(fd, &content)) return;
std::string header = android::base::StringPrintf("--- adb starting (pid %d) ---", pid);
std::vector<std::string> lines = android::base::Split(content, "\n");
int i = lines.size() - 1;
while (i >= 0 && lines[i] != header) --i;
while (static_cast<size_t>(i) < lines.size()) fprintf(stderr, "%s\n", lines[i++].c_str());
}
int launch_server(const std::string& socket_spec, const char* one_device) {
#if defined(_WIN32)
/* we need to start the server in the background */
/* we create a PIPE that will be used to wait for the server's "OK" */
/* message since the pipe handles must be inheritable, we use a */
/* security attribute */
SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof(sa);
sa.lpSecurityDescriptor = NULL;
sa.bInheritHandle = TRUE;
// Redirect stdin to Windows /dev/null. If we instead pass an original
// stdin/stdout/stderr handle and it is a console handle, when the adb
// server starts up, the C Runtime will see a console handle for a process
// that isn't connected to a console and it will configure
// stdin/stdout/stderr to be closed. At that point, freopen() could be used
// to reopen stderr/out, but it would take more massaging to fixup the file
// descriptor number that freopen() uses. It's simplest to avoid all of this
// complexity by just redirecting stdin to `nul' and then the C Runtime acts
// as expected.
unique_handle nul_read(CreateFileW(L"nul", GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE, &sa, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, NULL));
if (nul_read.get() == INVALID_HANDLE_VALUE) {
fprintf(stderr, "adb: CreateFileW 'nul' failed: %s\n",
android::base::SystemErrorCodeToString(GetLastError()).c_str());
return -1;
}
// Create pipes with non-inheritable read handle, inheritable write handle. We need to connect
// the subprocess to pipes instead of just letting the subprocess inherit our existing
// stdout/stderr handles because a DETACHED_PROCESS cannot write to a console that it is not
// attached to.
unique_handle ack_read, ack_write;
if (!_create_anonymous_pipe(&ack_read, &ack_write, &sa)) {
return -1;
}
unique_handle stdout_read, stdout_write;
if (!_create_anonymous_pipe(&stdout_read, &stdout_write, &sa)) {
return -1;
}
unique_handle stderr_read, stderr_write;
if (!_create_anonymous_pipe(&stderr_read, &stderr_write, &sa)) {
return -1;
}
/* Some programs want to launch an adb command and collect its output by
* calling CreateProcess with inheritable stdout/stderr handles, then
* using read() to get its output. When this happens, the stdout/stderr
* handles passed to the adb client process will also be inheritable.
* When starting the adb server here, care must be taken to reset them
* to non-inheritable.
* Otherwise, something bad happens: even if the adb command completes,
* the calling process is stuck while read()-ing from the stdout/stderr
* descriptors, because they're connected to corresponding handles in the
* adb server process (even if the latter never uses/writes to them).
* Note that even if we don't pass these handles in the STARTUPINFO struct,
* if they're marked inheritable, they're still inherited, requiring us to
* deal with this.
*
* If we're still having problems with inheriting random handles in the
* future, consider using PROC_THREAD_ATTRIBUTE_HANDLE_LIST to explicitly
* specify which handles should be inherited: http://blogs.msdn.com/b/oldnewthing/archive/2011/12/16/10248328.aspx
*
* Older versions of Windows return console pseudo-handles that cannot be
* made non-inheritable, so ignore those failures.
*/
_try_make_handle_noninheritable(GetStdHandle(STD_INPUT_HANDLE));
_try_make_handle_noninheritable(GetStdHandle(STD_OUTPUT_HANDLE));
_try_make_handle_noninheritable(GetStdHandle(STD_ERROR_HANDLE));
STARTUPINFOW startup;
ZeroMemory( &startup, sizeof(startup) );
startup.cb = sizeof(startup);
startup.hStdInput = nul_read.get();
startup.hStdOutput = stdout_write.get();
startup.hStdError = stderr_write.get();
startup.dwFlags = STARTF_USESTDHANDLES;
// Verify that the pipe_write handle value can be passed on the command line
// as %d and that the rest of adb code can pass it around in an int.
const int ack_write_as_int = cast_handle_to_int(ack_write.get());
if (cast_int_to_handle(ack_write_as_int) != ack_write.get()) {
// If this fires, either handle values are larger than 32-bits or else
// there is a bug in our casting.
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa384203%28v=vs.85%29.aspx
fprintf(stderr, "adb: cannot fit pipe handle value into 32-bits: 0x%p\n", ack_write.get());
return -1;
}
// get path of current program
WCHAR program_path[MAX_PATH];
const DWORD module_result = GetModuleFileNameW(NULL, program_path,
arraysize(program_path));
if ((module_result >= arraysize(program_path)) || (module_result == 0)) {
// String truncation or some other error.
fprintf(stderr, "adb: cannot get executable path: %s\n",
android::base::SystemErrorCodeToString(GetLastError()).c_str());
return -1;
}
WCHAR args[4096];
if (one_device) {
snwprintf(args, arraysize(args),
L"adb -L %s fork-server server --reply-fd %d --one-device %s",
socket_spec.c_str(), ack_write_as_int, one_device);
} else {
snwprintf(args, arraysize(args), L"adb -L %s fork-server server --reply-fd %d",
socket_spec.c_str(), ack_write_as_int);
}
PROCESS_INFORMATION pinfo;
ZeroMemory(&pinfo, sizeof(pinfo));
if (!CreateProcessW(
program_path, /* program path */
args,
/* the fork-server argument will set the
debug = 2 in the child */
NULL, /* process handle is not inheritable */
NULL, /* thread handle is not inheritable */
TRUE, /* yes, inherit some handles */
DETACHED_PROCESS, /* the new process doesn't have a console */
NULL, /* use parent's environment block */
NULL, /* use parent's starting directory */
&startup, /* startup info, i.e. std handles */
&pinfo )) {
fprintf(stderr, "adb: CreateProcessW failed: %s\n",
android::base::SystemErrorCodeToString(GetLastError()).c_str());
return -1;
}
unique_handle process_handle(pinfo.hProcess);
pinfo.hProcess = NULL;
// Close handles that we no longer need to complete the rest.
CloseHandle(pinfo.hThread);
pinfo.hThread = NULL;
nul_read.reset();
ack_write.reset();
stdout_write.reset();
stderr_write.reset();
// Start threads to read from subprocess stdout/stderr and write to ours to make subprocess
// errors easier to diagnose. Note that the threads internally create inheritable handles, but
// that is ok because we've already spawned the subprocess.
// In the past, reading from a pipe before the child process's C Runtime
// started up and called GetFileType() caused a hang: http://blogs.msdn.com/b/oldnewthing/archive/2011/12/02/10243553.aspx#10244216
// This is reportedly fixed in Windows Vista: https://support.microsoft.com/en-us/kb/2009703
// I was unable to reproduce the problem on Windows XP. It sounds like a
// Windows Update may have fixed this: https://www.duckware.com/tech/peeknamedpipe.html
unique_handle stdout_thread(reinterpret_cast<HANDLE>(
_beginthreadex(NULL, 0, _redirect_stdout_thread, stdout_read.get(),
0, NULL)));
if (stdout_thread.get() == nullptr) {
fprintf(stderr, "adb: cannot create thread: %s\n", strerror(errno));
return -1;
}
stdout_read.release(); // Transfer ownership to new thread
unique_handle stderr_thread(reinterpret_cast<HANDLE>(
_beginthreadex(NULL, 0, _redirect_stderr_thread, stderr_read.get(),
0, NULL)));
if (stderr_thread.get() == nullptr) {
fprintf(stderr, "adb: cannot create thread: %s\n", strerror(errno));
return -1;
}
stderr_read.release(); // Transfer ownership to new thread
bool got_ack = false;
// Wait for the "OK\n" message, for the pipe to be closed, or other error.
{
char temp[3];
DWORD count = 0;
if (ReadFile(ack_read.get(), temp, sizeof(temp), &count, NULL)) {
const CHAR expected[] = "OK\n";
const DWORD expected_length = arraysize(expected) - 1;
if (count == expected_length &&
memcmp(temp, expected, expected_length) == 0) {
got_ack = true;
} else {
ReportServerStartupFailure(pinfo.dwProcessId);
return -1;
}
} else {
const DWORD err = GetLastError();
// If the ACK was not written and the process exited, GetLastError()
// is probably ERROR_BROKEN_PIPE, in which case that info is not
// useful to the user.
fprintf(stderr, "could not read ok from ADB Server%s\n",
err == ERROR_BROKEN_PIPE ? "" :
android::base::StringPrintf(": %s",
android::base::SystemErrorCodeToString(err).c_str()).c_str());
}
}
// Always try to wait a bit for threads reading stdout/stderr to finish.
// If the process started ok, it should close the pipes causing the threads
// to finish. If the process had an error, it should exit, also causing
// the pipes to be closed. In that case we want to read all of the output
// and write it out so that the user can diagnose failures.
const DWORD thread_timeout_ms = 15 * 1000;
const HANDLE threads[] = { stdout_thread.get(), stderr_thread.get() };
const DWORD wait_result = WaitForMultipleObjects(arraysize(threads),
threads, TRUE, thread_timeout_ms);
if (wait_result == WAIT_TIMEOUT) {
// Threads did not finish after waiting a little while. Perhaps the
// server didn't close pipes, or it is hung.
fprintf(stderr, "adb: timed out waiting for threads to finish reading from ADB server\n");
// Process handles are signaled when the process exits, so if we wait
// on the handle for 0 seconds and it returns 'timeout', that means that
// the process is still running.
if (WaitForSingleObject(process_handle.get(), 0) == WAIT_TIMEOUT) {
// We could TerminateProcess(), but that seems somewhat presumptive.
fprintf(stderr, "adb: server is running with process id %lu\n", pinfo.dwProcessId);
}
return -1;
}
if (wait_result != WAIT_OBJECT_0) {
fprintf(stderr, "adb: unexpected result waiting for threads: %lu: %s\n", wait_result,
android::base::SystemErrorCodeToString(GetLastError()).c_str());
return -1;
}
// For now ignore the thread exit codes and assume they worked properly.