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/*
* Copyright (C) 2015 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_client.h"
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <condition_variable>
#include <mutex>
#include <optional>
#include <string>
#include <thread>
#include <vector>
#include <android-base/file.h>
#include <android-base/no_destructor.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <android-base/thread_annotations.h>
#include <cutils/sockets.h>
#include "adb_io.h"
#include "adb_utils.h"
#include "socket_spec.h"
#include "sysdeps/chrono.h"
static TransportType __adb_transport = kTransportAny;
static const char* __adb_serial = nullptr;
static TransportId __adb_transport_id = 0;
static const char* __adb_server_socket_spec;
void adb_set_transport(TransportType type, const char* serial, TransportId transport_id) {
__adb_transport = type;
__adb_serial = serial;
__adb_transport_id = transport_id;
}
void adb_get_transport(TransportType* type, const char** serial, TransportId* transport_id) {
if (type) *type = __adb_transport;
if (serial) *serial = __adb_serial;
if (transport_id) *transport_id = __adb_transport_id;
}
void adb_set_socket_spec(const char* socket_spec) {
if (__adb_server_socket_spec) {
LOG(FATAL) << "attempted to reinitialize adb_server_socket_spec " << socket_spec << " (was " << __adb_server_socket_spec << ")";
}
__adb_server_socket_spec = socket_spec;
}
static std::optional<TransportId> switch_socket_transport(int fd, std::string* error) {
TransportId result;
bool read_transport = true;
std::string service;
if (__adb_transport_id) {
read_transport = false;
service += "host:transport-id:";
service += std::to_string(__adb_transport_id);
result = __adb_transport_id;
} else if (__adb_serial) {
service += "host:tport:serial:";
service += __adb_serial;
} else {
const char* transport_type = "???";
switch (__adb_transport) {
case kTransportUsb:
transport_type = "usb";
break;
case kTransportLocal:
transport_type = "local";
break;
case kTransportAny:
transport_type = "any";
break;
case kTransportHost:
// no switch necessary
return 0;
}
service += "host:tport:";
service += transport_type;
}
if (!SendProtocolString(fd, service)) {
*error = perror_str("write failure during connection");
return std::nullopt;
}
LOG(DEBUG) << "Switch transport in progress: " << service;
if (!adb_status(fd, error)) {
D("Switch transport failed: %s", error->c_str());
return std::nullopt;
}
if (read_transport) {
if (!ReadFdExactly(fd, &result, sizeof(result))) {
*error = "failed to read transport id from server";
return std::nullopt;
}
}
D("Switch transport success");
return result;
}
bool adb_status(borrowed_fd fd, std::string* error) {
char buf[5];
if (!ReadFdExactly(fd, buf, 4)) {
*error = perror_str("protocol fault (couldn't read status)");
return false;
}
if (!memcmp(buf, "OKAY", 4)) {
return true;
}
if (memcmp(buf, "FAIL", 4)) {
*error = android::base::StringPrintf("protocol fault (status %02x %02x %02x %02x?!)",
buf[0], buf[1], buf[2], buf[3]);
return false;
}
ReadProtocolString(fd, error, error);
return false;
}
static int _adb_connect(std::string_view service, TransportId* transport, std::string* error,
bool force_switch = false) {
LOG(DEBUG) << "_adb_connect: " << service;
if (service.empty() || service.size() > MAX_PAYLOAD) {
*error = android::base::StringPrintf("bad service name length (%zd)", service.size());
return -1;
}
std::string reason;
unique_fd fd;
if (!socket_spec_connect(&fd, __adb_server_socket_spec, nullptr, nullptr, &reason)) {
*error = android::base::StringPrintf("cannot connect to daemon at %s: %s",
__adb_server_socket_spec, reason.c_str());
return -2;
}
if (!service.starts_with("host") || force_switch) {
std::optional<TransportId> transport_result = switch_socket_transport(fd.get(), error);
if (!transport_result) {
return -1;
}
if (transport) {
*transport = *transport_result;
}
}
if (!SendProtocolString(fd.get(), service)) {
*error = perror_str("write failure during connection");
return -1;
}
if (!adb_status(fd.get(), error)) {
return -1;
}
D("_adb_connect: return fd %d", fd.get());
return fd.release();
}
bool adb_kill_server() {
D("adb_kill_server");
std::string reason;
unique_fd fd;
if (!socket_spec_connect(&fd, __adb_server_socket_spec, nullptr, nullptr, &reason)) {
fprintf(stderr, "cannot connect to daemon at %s: %s\n", __adb_server_socket_spec,
reason.c_str());
return true;
}
if (!SendProtocolString(fd.get(), "host:kill")) {
fprintf(stderr, "error: write failure during connection: %s\n", strerror(errno));
return false;
}
char buf[4];
if (!ReadFdExactly(fd.get(), buf, 4)) {
fprintf(stderr, "error: failed to read response from server\n");
return false;
}
if (memcmp(buf, "OKAY", 4) == 0) {
// Nothing to do.
} else if (memcmp(buf, "FAIL", 4) == 0) {
std::string output, error;
if (!ReadProtocolString(fd.get(), &output, &error)) {
fprintf(stderr, "error: %s\n", error.c_str());
return false;
}
fprintf(stderr, "error: %s\n", output.c_str());
return false;
}
// Now that no more data is expected, wait for socket orderly shutdown or error, indicating
// server death.
ReadOrderlyShutdown(fd.get());
return true;
}
int adb_connect(std::string_view service, std::string* error) {
return adb_connect(nullptr, service, error);
}
#if defined(__linux__)
std::optional<std::string> adb_get_server_executable_path() {
int port;
std::string error;
if (!parse_tcp_socket_spec(__adb_server_socket_spec, nullptr, &port, nullptr, &error)) {
return {};
}
return adb_get_android_dir_path() + OS_PATH_SEPARATOR + "adb." + std::to_string(port);
}
#endif
static bool __adb_check_server_version(std::string* error) {
unique_fd fd(_adb_connect("host:version", nullptr, error));
bool local = is_local_socket_spec(__adb_server_socket_spec);
if (fd == -2 && !local) {
fprintf(stderr, "* cannot start server on remote host\n");
// error is the original network connection error
return false;
} else if (fd == -2) {
fprintf(stderr, "* daemon not running; starting now at %s\n", __adb_server_socket_spec);
start_server:
if (launch_server(__adb_server_socket_spec)) {
fprintf(stderr, "* failed to start daemon\n");
// launch_server() has already printed detailed error info, so just
// return a generic error string about the overall adb_connect()
// that the caller requested.
*error = "cannot connect to daemon";
return false;
} else {
fprintf(stderr, "* daemon started successfully\n");
}
// The server will wait until it detects all of its connected devices before acking.
// Fall through to _adb_connect.
} else {
// If a server is already running, check its version matches.
int version = 0;
// If we have a file descriptor, then parse version result.
if (fd >= 0) {
std::string version_string;
if (!ReadProtocolString(fd, &version_string, error)) {
return false;
}
ReadOrderlyShutdown(fd);
if (sscanf(&version_string[0], "%04x", &version) != 1) {
*error = android::base::StringPrintf("cannot parse version string: %s",
version_string.c_str());
return false;
}
} else {
// If fd is -1 check for "unknown host service" which would
// indicate a version of adb that does not support the
// version command, in which case we should fall-through to kill it.
if (*error != "unknown host service") {
return false;
}
}
if (version != ADB_SERVER_VERSION) {
#if defined(__linux__)
if (version > ADB_SERVER_VERSION && local) {
// Try to re-exec the existing adb server's binary.
constexpr const char* adb_reexeced = "adb (re-execed)";
if (strcmp(adb_reexeced, *__adb_argv) != 0) {
__adb_argv[0] = adb_reexeced;
std::optional<std::string> server_path_path = adb_get_server_executable_path();
std::string server_path;
if (server_path_path &&
android::base::ReadFileToString(*server_path_path, &server_path)) {
if (execve(server_path.c_str(), const_cast<char**>(__adb_argv),
const_cast<char**>(__adb_envp)) == -1) {
LOG(ERROR) << "failed to exec newer version at " << server_path;
}
// Fall-through to restarting the server.
}
}
}
#endif
fprintf(stderr, "adb server version (%d) doesn't match this client (%d); killing...\n",
version, ADB_SERVER_VERSION);
adb_kill_server();
goto start_server;
}
}
return true;
}
bool adb_check_server_version(std::string* error) {
// Only check the version once per process, since this isn't atomic anyway.
static std::once_flag once;
static bool result;
static std::string* err;
std::call_once(once, []() {
err = new std::string();
result = __adb_check_server_version(err);
});
*error = *err;
return result;
}
int adb_connect(TransportId* transport, std::string_view service, std::string* error,
bool force_switch_device) {
LOG(DEBUG) << "adb_connect: service: " << service;
// Query the adb server's version.
if (!adb_check_server_version(error)) {
return -1;
}
// if the command is start-server, we are done.
if (service == "host:start-server") {
return 0;
}
unique_fd fd(_adb_connect(service, transport, error, force_switch_device));
if (fd == -1) {
D("_adb_connect error: %s", error->c_str());
} else if(fd == -2) {
fprintf(stderr, "* daemon still not running\n");
}
D("adb_connect: return fd %d", fd.get());
return fd.release();
}
bool adb_command(const std::string& service) {
std::string error;
unique_fd fd(adb_connect(service, &error));
if (fd < 0) {
fprintf(stderr, "error: %s\n", error.c_str());
return false;
}
if (!adb_status(fd.get(), &error)) {
fprintf(stderr, "error: %s\n", error.c_str());
return false;
}
ReadOrderlyShutdown(fd.get());
return true;
}
bool adb_query(const std::string& service, std::string* result, std::string* error) {
D("adb_query: %s", service.c_str());
unique_fd fd(adb_connect(service, error));
if (fd < 0) {
return false;
}
result->clear();
if (!ReadProtocolString(fd.get(), result, error)) {
return false;
}
ReadOrderlyShutdown(fd.get());
return true;
}
std::string format_host_command(const char* command) {
if (__adb_transport_id) {
return android::base::StringPrintf("host-transport-id:%" PRIu64 ":%s", __adb_transport_id,
command);
} else if (__adb_serial) {
return android::base::StringPrintf("host-serial:%s:%s", __adb_serial, command);
}
const char* prefix = "host";
if (__adb_transport == kTransportUsb) {
prefix = "host-usb";
} else if (__adb_transport == kTransportLocal) {
prefix = "host-local";
}
return android::base::StringPrintf("%s:%s", prefix, command);
}
const std::optional<FeatureSet>& adb_get_feature_set(std::string* error) {
static std::mutex feature_mutex [[clang::no_destroy]];
static std::optional<FeatureSet> features [[clang::no_destroy]] GUARDED_BY(feature_mutex);
std::lock_guard<std::mutex> lock(feature_mutex);
if (!features) {
std::string result;
std::string err;
if (adb_query(format_host_command("features"), &result, &err)) {
features = StringToFeatureSet(result);
} else {
if (error) {
*error = err;
}
}
}
return features;
}