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platform_system_core/adb/adb.cpp
Josh Gao ba6d1da8ea adb: add option to disable kill-server. 
In the post-apocalypse, it's increasingly common for people to use ssh
port forwarding to use an adb client with a remote adb server. This
results in `adb kill-server` being catastrophic, because the client has
no way of restarting the server on the other end. Android Studio in
particular has an unforunate habit of trying to manage adb's life cycle
such that starting or exiting Studio will result in a kill-server.

Add the ADB_REJECT_KILL_SERVER environment variable which ignores
kill-server, to make this scenario a bit better.

Bug: http://b/152251952
Test: ADB_REJECT_KILL_SERVER=1 adb start-server; adb kill-server
Change-Id: I5533a6dcbdb9220526a6fcf9ca31d9fcef1cec17
2020-04-06 14:33:14 -07:00

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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 <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 <build/version.h>
#include <platform_tools_version.h>
#include "adb_auth.h"
#include "adb_io.h"
#include "adb_listeners.h"
#include "adb_unique_fd.h"
#include "adb_utils.h"
#include "adb_wifi.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
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;
}
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;
t->SetConnectionEstablished(true);
}
void handle_offline(atransport *t)
{
if (t->GetConnectionState() == kCsOffline) {
LOG(INFO) << t->serial_name() << ": already offline";
return;
}
LOG(INFO) << t->serial_name() << ": offline";
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 = "ATLS";
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
static void send_ready(unsigned local, unsigned remote, atransport *t)
{
D("Calling send_ready");
apacket *p = get_apacket();
p->msg.command = A_OKAY;
p->msg.arg0 = local;
p->msg.arg1 = remote;
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, 0, "destination") */
if (t->online && p->msg.arg0 != 0 && p->msg.arg1 == 0) {
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);
} else {
s->peer = create_remote_socket(p->msg.arg0, t);
s->peer->peer = s;
send_ready(s->id, s->peer->id, t);
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) {
if(s->peer == nullptr) {
/* On first READY message, create the connection. */
s->peer = create_remote_socket(p->msg.arg0, t);
s->peer->peer = s;
s->ready(s);
} else if (s->peer->id == p->msg.arg0) {
/* Other READY messages must use the same local-id */
s->ready(s);
} 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) {
unsigned rid = p->msg.arg0;
if (s->enqueue(s, std::move(p->payload)) == 0) {
D("Enqueue the socket");
send_ready(s->id, rid, t);
}
}
}
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) {
#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[64];
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.
if (!got_ack) {
return -1;
}
#else /* !defined(_WIN32) */
// set up a pipe so the child can tell us when it is ready.
unique_fd pipe_read, pipe_write;
if (!Pipe(&pipe_read, &pipe_write)) {
fprintf(stderr, "pipe failed in launch_server, errno: %d\n", errno);
return -1;
}
std::string path = android::base::GetExecutablePath();
pid_t pid = fork();
if (pid < 0) return -1;
if (pid == 0) {
// child side of the fork
pipe_read.reset();
// android::base::Pipe unconditionally opens the pipe with O_CLOEXEC.
// Undo this manually.
fcntl(pipe_write.get(), F_SETFD, 0);
char reply_fd[30];
snprintf(reply_fd, sizeof(reply_fd), "%d", pipe_write.get());
// child process
int result = execl(path.c_str(), "adb", "-L", socket_spec.c_str(), "fork-server", "server",
"--reply-fd", reply_fd, NULL);
// this should not return
fprintf(stderr, "adb: execl returned %d: %s\n", result, strerror(errno));
} else {
// parent side of the fork
char temp[3] = {};
// wait for the "OK\n" message
pipe_write.reset();
int ret = adb_read(pipe_read.get(), temp, 3);
int saved_errno = errno;
pipe_read.reset();
if (ret < 0) {
fprintf(stderr, "could not read ok from ADB Server, errno = %d\n", saved_errno);
return -1;
}
if (ret != 3 || temp[0] != 'O' || temp[1] != 'K' || temp[2] != '\n') {
ReportServerStartupFailure(pid);
return -1;
}
}
#endif /* !defined(_WIN32) */
return 0;
}
#endif /* ADB_HOST */
bool handle_forward_request(const char* service, atransport* transport, int reply_fd) {
return handle_forward_request(service, [transport](std::string*) { return transport; },
reply_fd);
}
// Try to handle a network forwarding request.
bool handle_forward_request(const char* service,
std::function<atransport*(std::string* error)> transport_acquirer,
int reply_fd) {
if (!strcmp(service, "list-forward")) {
// Create the list of forward redirections.
std::string listeners = format_listeners();
#if ADB_HOST
SendOkay(reply_fd);
#endif
SendProtocolString(reply_fd, listeners);
return true;
}
if (!strcmp(service, "killforward-all")) {
remove_all_listeners();
#if ADB_HOST
/* On the host: 1st OKAY is connect, 2nd OKAY is status */
SendOkay(reply_fd);
#endif
SendOkay(reply_fd);
return true;
}
if (!strncmp(service, "forward:", 8) || !strncmp(service, "killforward:", 12)) {
// killforward:local
// forward:(norebind:)?local;remote
std::string error;
atransport* transport = transport_acquirer(&error);
if (!transport) {
SendFail(reply_fd, error);
return true;
}
bool kill_forward = false;
bool no_rebind = false;
if (android::base::StartsWith(service, "killforward:")) {
kill_forward = true;
service += 12;
} else {
service += 8; // skip past "forward:"
if (android::base::StartsWith(service, "norebind:")) {
no_rebind = true;
service += 9;
}
}
std::vector<std::string> pieces = android::base::Split(service, ";");
if (kill_forward) {
// Check killforward: parameter format: '<local>'
if (pieces.size() != 1 || pieces[0].empty()) {
SendFail(reply_fd, android::base::StringPrintf("bad killforward: %s", service));
return true;
}
} else {
// Check forward: parameter format: '<local>;<remote>'
if (pieces.size() != 2 || pieces[0].empty() || pieces[1].empty() || pieces[1][0] == '*') {
SendFail(reply_fd, android::base::StringPrintf("bad forward: %s", service));
return true;
}
}
InstallStatus r;
int resolved_tcp_port = 0;
if (kill_forward) {
r = remove_listener(pieces[0].c_str(), transport);
} else {
int flags = 0;
if (no_rebind) {
flags |= INSTALL_LISTENER_NO_REBIND;
}
r = install_listener(pieces[0], pieces[1].c_str(), transport, flags, &resolved_tcp_port,
&error);
}
if (r == INSTALL_STATUS_OK) {
#if ADB_HOST
// On the host: 1st OKAY is connect, 2nd OKAY is status.
SendOkay(reply_fd);
#endif
SendOkay(reply_fd);
// If a TCP port was resolved, send the actual port number back.
if (resolved_tcp_port != 0) {
SendProtocolString(reply_fd, android::base::StringPrintf("%d", resolved_tcp_port));
}
return true;
}
std::string message;
switch (r) {
case INSTALL_STATUS_OK: message = "success (!)"; break;
case INSTALL_STATUS_INTERNAL_ERROR: message = "internal error"; break;
case INSTALL_STATUS_CANNOT_BIND:
message = android::base::StringPrintf("cannot bind listener: %s",
error.c_str());
break;
case INSTALL_STATUS_CANNOT_REBIND:
message = android::base::StringPrintf("cannot rebind existing socket");
break;
case INSTALL_STATUS_LISTENER_NOT_FOUND:
message = android::base::StringPrintf("listener '%s' not found", service);
break;
}
SendFail(reply_fd, message);
return true;
}
return false;
}
#if ADB_HOST
static int SendOkay(int fd, const std::string& s) {
SendOkay(fd);
SendProtocolString(fd, s);
return 0;
}
static bool g_reject_kill_server = false;
void adb_set_reject_kill_server(bool value) {
g_reject_kill_server = value;
}
HostRequestResult handle_host_request(std::string_view service, TransportType type,
const char* serial, TransportId transport_id, int reply_fd,
asocket* s) {
if (service == "kill") {
if (g_reject_kill_server) {
LOG(WARNING) << "adb server ignoring kill-server";
SendFail(reply_fd, "kill-server rejected by remote server");
} else {
fprintf(stderr, "adb server killed by remote request\n");
SendOkay(reply_fd);
// Rely on process exit to close the socket for us.
exit(0);
}
}
LOG(DEBUG) << "handle_host_request(" << service << ")";
// Transport selection:
if (service.starts_with("transport") || service.starts_with("tport:")) {
TransportType type = kTransportAny;
std::string serial_storage;
bool legacy = true;
// New transport selection protocol:
// This is essentially identical to the previous version, except it returns the selected
// transport id to the caller as well.
if (android::base::ConsumePrefix(&service, "tport:")) {
legacy = false;
if (android::base::ConsumePrefix(&service, "serial:")) {
serial_storage = service;
serial = serial_storage.c_str();
} else if (service == "usb") {
type = kTransportUsb;
} else if (service == "local") {
type = kTransportLocal;
} else if (service == "any") {
type = kTransportAny;
}
// Selection by id is unimplemented, since you obviously already know the transport id
// you're connecting to.
} else {
if (android::base::ConsumePrefix(&service, "transport-id:")) {
if (!ParseUint(&transport_id, service)) {
SendFail(reply_fd, "invalid transport id");
return HostRequestResult::Handled;
}
} else if (service == "transport-usb") {
type = kTransportUsb;
} else if (service == "transport-local") {
type = kTransportLocal;
} else if (service == "transport-any") {
type = kTransportAny;
} else if (android::base::ConsumePrefix(&service, "transport:")) {
serial_storage = service;
serial = serial_storage.c_str();
}
}
std::string error;
atransport* t = acquire_one_transport(type, serial, transport_id, nullptr, &error);
if (t != nullptr) {
s->transport = t;
SendOkay(reply_fd);
if (!legacy) {
// Nothing we can do if this fails.
WriteFdExactly(reply_fd, &t->id, sizeof(t->id));
}
return HostRequestResult::SwitchedTransport;
} else {
SendFail(reply_fd, error);
return HostRequestResult::Handled;
}
}
// return a list of all connected devices
if (service == "devices" || service == "devices-l") {
bool long_listing = service == "devices-l";
D("Getting device list...");
std::string device_list = list_transports(long_listing);
D("Sending device list...");
SendOkay(reply_fd, device_list);
return HostRequestResult::Handled;
}
if (service == "reconnect-offline") {
std::string response;
close_usb_devices([&response](const atransport* transport) {
if (!ConnectionStateIsOnline(transport->GetConnectionState())) {
response += "reconnecting " + transport->serial_name() + "\n";
return true;
}
return false;
}, true);
if (!response.empty()) {
response.resize(response.size() - 1);
}
SendOkay(reply_fd, response);
return HostRequestResult::Handled;
}
if (service == "features") {
std::string error;
atransport* t =
s->transport ? s->transport
: acquire_one_transport(type, serial, transport_id, nullptr, &error);
if (t != nullptr) {
SendOkay(reply_fd, FeatureSetToString(t->features()));
} else {
SendFail(reply_fd, error);
}
return HostRequestResult::Handled;
}
if (service == "host-features") {
FeatureSet features = supported_features();
// Abuse features to report libusb status.
if (should_use_libusb()) {
features.insert(kFeatureLibusb);
}
features.insert(kFeaturePushSync);
SendOkay(reply_fd, FeatureSetToString(features));
return HostRequestResult::Handled;
}
// remove TCP transport
if (service.starts_with("disconnect:")) {
std::string address(service.substr(11));
if (address.empty()) {
kick_all_tcp_devices();
SendOkay(reply_fd, "disconnected everything");
return HostRequestResult::Handled;
}
std::string serial;
std::string host;
int port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT;
std::string error;
if (address.starts_with("vsock:") || address.starts_with("localfilesystem:")) {
serial = address;
} else if (!android::base::ParseNetAddress(address, &host, &port, &serial, &error)) {
SendFail(reply_fd, android::base::StringPrintf("couldn't parse '%s': %s",
address.c_str(), error.c_str()));
return HostRequestResult::Handled;
}
atransport* t = find_transport(serial.c_str());
if (t == nullptr) {
SendFail(reply_fd, android::base::StringPrintf("no such device '%s'", serial.c_str()));
return HostRequestResult::Handled;
}
kick_transport(t);
SendOkay(reply_fd, android::base::StringPrintf("disconnected %s", address.c_str()));
return HostRequestResult::Handled;
}
// Returns our value for ADB_SERVER_VERSION.
if (service == "version") {
SendOkay(reply_fd, android::base::StringPrintf("%04x", ADB_SERVER_VERSION));
return HostRequestResult::Handled;
}
// These always report "unknown" rather than the actual error, for scripts.
if (service == "get-serialno") {
std::string error;
atransport* t =
s->transport ? s->transport
: acquire_one_transport(type, serial, transport_id, nullptr, &error);
if (t) {
SendOkay(reply_fd, !t->serial.empty() ? t->serial : "unknown");
} else {
SendFail(reply_fd, error);
}
return HostRequestResult::Handled;
}
if (service == "get-devpath") {
std::string error;
atransport* t =
s->transport ? s->transport
: acquire_one_transport(type, serial, transport_id, nullptr, &error);
if (t) {
SendOkay(reply_fd, !t->devpath.empty() ? t->devpath : "unknown");
} else {
SendFail(reply_fd, error);
}
return HostRequestResult::Handled;
}
if (service == "get-state") {
std::string error;
atransport* t =
s->transport ? s->transport
: acquire_one_transport(type, serial, transport_id, nullptr, &error);
if (t) {
SendOkay(reply_fd, t->connection_state_name());
} else {
SendFail(reply_fd, error);
}
return HostRequestResult::Handled;
}
// Indicates a new emulator instance has started.
if (android::base::ConsumePrefix(&service, "emulator:")) {
unsigned int port;
if (!ParseUint(&port, service)) {
LOG(ERROR) << "received invalid port for emulator: " << service;
} else {
local_connect(port);
}
/* we don't even need to send a reply */
return HostRequestResult::Handled;
}
if (service == "reconnect") {
std::string response;
atransport* t = s->transport ? s->transport
: acquire_one_transport(type, serial, transport_id, nullptr,
&response, true);
if (t != nullptr) {
kick_transport(t, true);
response =
"reconnecting " + t->serial_name() + " [" + t->connection_state_name() + "]\n";
}
SendOkay(reply_fd, response);
return HostRequestResult::Handled;
}
// TODO: Switch handle_forward_request to string_view.
std::string service_str(service);
auto transport_acquirer = [=](std::string* error) {
if (s->transport) {
return s->transport;
} else {
std::string error;
return acquire_one_transport(type, serial, transport_id, nullptr, &error);
}
};
if (handle_forward_request(service_str.c_str(), transport_acquirer, reply_fd)) {
return HostRequestResult::Handled;
}
return HostRequestResult::Unhandled;
}
static auto& init_mutex = *new std::mutex();
static auto& init_cv = *new std::condition_variable();
static bool device_scan_complete = false;
static bool transports_ready = false;
void update_transport_status() {
bool result = iterate_transports([](const atransport* t) {
if (t->type == kTransportUsb && t->online != 1) {
return false;
}
return true;
});
bool ready;
{
std::lock_guard<std::mutex> lock(init_mutex);
transports_ready = result;
ready = transports_ready && device_scan_complete;
}
if (ready) {
init_cv.notify_all();
}
}
void adb_notify_device_scan_complete() {
{
std::lock_guard<std::mutex> lock(init_mutex);
if (device_scan_complete) {
return;
}
device_scan_complete = true;
}
update_transport_status();
}
void adb_wait_for_device_initialization() {
std::unique_lock<std::mutex> lock(init_mutex);
init_cv.wait_for(lock, 3s, []() { return device_scan_complete && transports_ready; });
}
#endif // ADB_HOST
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