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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.
*/
#include "sysdeps.h"
#include <stdio.h>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/strings.h>
#include <cutils/sockets.h>
#include "adb.h"
#include "adb_client.h"
#include "adb_io.h"
#include "adb_utils.h"
// Return the console authentication command for the emulator, if needed
static std::string adb_construct_auth_command() {
static const char auth_token_filename[] = ".emulator_console_auth_token";
std::string auth_token_path = adb_get_homedir_path();
auth_token_path += OS_PATH_SEPARATOR;
auth_token_path += auth_token_filename;
// read the token
std::string token;
if (!android::base::ReadFileToString(auth_token_path, &token)
|| token.empty()) {
// we either can't read the file, or it doesn't exist, or it's empty -
// either way we won't add any authentication command.
return {};
}
// now construct and return the actual command: "auth <token>\n"
std::string command = "auth ";
command += token;
command += '\n';
return command;
}
// Return the console port of the currently connected emulator (if any) or -1 if
// there is no emulator, and -2 if there is more than one.
static int adb_get_emulator_console_port(const char* serial) {
if (serial) {
// The user specified a serial number; is it an emulator?
int port;
return (sscanf(serial, "emulator-%d", &port) == 1) ? port : -1;
}
// No specific device was given, so get the list of connected devices and
// search for emulators. If there's one, we'll take it. If there are more
// than one, that's an error.
std::string devices;
std::string error;
if (!adb_query("host:devices", &devices, &error)) {
fprintf(stderr, "error: no emulator connected: %s\n", error.c_str());
return -1;
}
int port;
size_t emulator_count = 0;
for (const auto& device : android::base::Split(devices, "\n")) {
if (sscanf(device.c_str(), "emulator-%d", &port) == 1) {
if (++emulator_count > 1) {
fprintf(
stderr, "error: more than one emulator detected; use -s\n");
return -1;
}
}
}
if (emulator_count == 0) {
fprintf(stderr, "error: no emulator detected\n");
return -1;
}
return port;
}
static int connect_to_console(const char* serial) {
int port = adb_get_emulator_console_port(serial);
if (port == -1) {
return -1;
}
std::string error;
int fd = network_loopback_client(port, SOCK_STREAM, &error);
if (fd == -1) {
fprintf(stderr, "error: could not connect to TCP port %d: %s\n", port,
error.c_str());
return -1;
}
return fd;
}
int adb_send_emulator_command(int argc, const char** argv, const char* serial) {
unique_fd fd(connect_to_console(serial));
if (fd == -1) {
return 1;
}
std::string commands = adb_construct_auth_command();
for (int i = 1; i < argc; i++) {
commands.append(argv[i]);
commands.push_back(i == argc - 1 ? '\n' : ' ');
}
commands.append("quit\n");
if (!WriteFdExactly(fd, commands)) {
fprintf(stderr, "error: cannot write to emulator: %s\n",
strerror(errno));
return 1;
}
// Drain output that the emulator console has sent us to prevent a problem
// on Windows where if adb closes the socket without reading all the data,
// the emulator's next call to recv() will have an ECONNABORTED error,
// preventing the emulator from reading the command that adb has sent.
// https://code.google.com/p/android/issues/detail?id=21021
int result;
std::string emulator_output;
do {
char buf[BUFSIZ];
result = adb_read(fd, buf, sizeof(buf));
// Keep reading until zero bytes (orderly/graceful shutdown) or an
// error. If 'adb emu kill' is executed, the emulator calls exit() with
// the socket open (and shutdown(SD_SEND) was not called), which causes
// Windows to send a TCP RST segment which causes adb to get ECONNRESET.
// Any other emu command is followed by the quit command that we
// appended above, and that causes the emulator to close the socket
// which should cause zero bytes (orderly/graceful shutdown) to be
// returned.
if (result > 0) emulator_output.append(buf, result);
} while (result > 0);
// Note: the following messages are expected to be quite stable from emulator.
//
// Emulator console will send the following message upon connection:
//
// Android Console: Authentication required
// Android Console: type 'auth <auth_token>' to authenticate
// Android Console: you can find your <auth_token> in
// '/<path-to-home>/.emulator_console_auth_token'
// OK\r\n
//
// and the following after authentication:
// Android Console: type 'help' for a list of commands
// OK\r\n
//
// So try search and skip first two "OK\r\n", print the rest.
//
const std::string delims = "OK\r\n";
size_t found = 0;
for (int i = 0; i < 2; ++i) {
const size_t result = emulator_output.find(delims, found);
if (result == std::string::npos) {
break;
} else {
found = result + delims.size();
}
}
printf("%s", emulator_output.c_str() + found);
return 0;
}
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