scrcpy/app/src/server.c

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C
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#include "server.h"
#include <errno.h>
#include <inttypes.h>
#include <libgen.h>
#include <stdio.h>
#include <SDL2/SDL_assert.h>
#include <SDL2/SDL_timer.h>
#include "config.h"
#include "command.h"
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#include "util/log.h"
#include "util/net.h"
#define SOCKET_NAME "scrcpy"
#define SERVER_FILENAME "scrcpy-server"
#define DEFAULT_SERVER_PATH PREFIX "/share/scrcpy/" SERVER_FILENAME
#define DEVICE_SERVER_PATH "/data/local/tmp/scrcpy-server.jar"
static const char *
get_server_path(void) {
const char *server_path_env = getenv("SCRCPY_SERVER_PATH");
if (server_path_env) {
LOGD("Using SCRCPY_SERVER_PATH: %s", server_path_env);
// if the envvar is set, use it
return server_path_env;
}
#ifndef PORTABLE
LOGD("Using server: " DEFAULT_SERVER_PATH);
// the absolute path is hardcoded
return DEFAULT_SERVER_PATH;
#else
// use scrcpy-server in the same directory as the executable
char *executable_path = get_executable_path();
if (!executable_path) {
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LOGE("Could not get executable path, "
"using " SERVER_FILENAME " from current directory");
// not found, use current directory
return SERVER_FILENAME;
}
char *dir = dirname(executable_path);
size_t dirlen = strlen(dir);
// sizeof(SERVER_FILENAME) gives statically the size including the null byte
size_t len = dirlen + 1 + sizeof(SERVER_FILENAME);
char *server_path = SDL_malloc(len);
if (!server_path) {
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LOGE("Could not alloc server path string, "
"using " SERVER_FILENAME " from current directory");
SDL_free(executable_path);
return SERVER_FILENAME;
}
memcpy(server_path, dir, dirlen);
server_path[dirlen] = PATH_SEPARATOR;
memcpy(&server_path[dirlen + 1], SERVER_FILENAME, sizeof(SERVER_FILENAME));
// the final null byte has been copied with SERVER_FILENAME
SDL_free(executable_path);
LOGD("Using server (portable): %s", server_path);
return server_path;
#endif
}
static bool
push_server(const char *serial) {
process_t process = adb_push(serial, get_server_path(), DEVICE_SERVER_PATH);
return process_check_success(process, "adb push");
}
static bool
enable_tunnel_reverse(const char *serial, uint16_t local_port) {
process_t process = adb_reverse(serial, SOCKET_NAME, local_port);
return process_check_success(process, "adb reverse");
}
static bool
disable_tunnel_reverse(const char *serial) {
process_t process = adb_reverse_remove(serial, SOCKET_NAME);
return process_check_success(process, "adb reverse --remove");
}
static bool
enable_tunnel_forward(const char *serial, uint16_t local_port) {
process_t process = adb_forward(serial, local_port, SOCKET_NAME);
return process_check_success(process, "adb forward");
}
static bool
disable_tunnel_forward(const char *serial, uint16_t local_port) {
process_t process = adb_forward_remove(serial, local_port);
return process_check_success(process, "adb forward --remove");
}
static bool
enable_tunnel(struct server *server) {
if (enable_tunnel_reverse(server->serial, server->local_port)) {
return true;
}
LOGW("'adb reverse' failed, fallback to 'adb forward'");
server->tunnel_forward = true;
return enable_tunnel_forward(server->serial, server->local_port);
}
static bool
disable_tunnel(struct server *server) {
if (server->tunnel_forward) {
return disable_tunnel_forward(server->serial, server->local_port);
}
return disable_tunnel_reverse(server->serial);
}
static process_t
execute_server(struct server *server, const struct server_params *params) {
char max_size_string[6];
char bit_rate_string[11];
char max_fps_string[6];
sprintf(max_size_string, "%"PRIu16, params->max_size);
sprintf(bit_rate_string, "%"PRIu32, params->bit_rate);
sprintf(max_fps_string, "%"PRIu16, params->max_fps);
const char *const cmd[] = {
"shell",
"CLASSPATH=" DEVICE_SERVER_PATH,
"app_process",
#ifdef SERVER_DEBUGGER
# define SERVER_DEBUGGER_PORT "5005"
"-agentlib:jdwp=transport=dt_socket,suspend=y,server=y,address="
SERVER_DEBUGGER_PORT,
#endif
"/", // unused
"com.genymobile.scrcpy.Server",
SCRCPY_VERSION,
max_size_string,
bit_rate_string,
max_fps_string,
server->tunnel_forward ? "true" : "false",
params->crop ? params->crop : "-",
"true", // always send frame meta (packet boundaries + timestamp)
params->control ? "true" : "false",
};
#ifdef SERVER_DEBUGGER
LOGI("Server debugger waiting for a client on device port "
SERVER_DEBUGGER_PORT "...");
// From the computer, run
// adb forward tcp:5005 tcp:5005
// Then, from Android Studio: Run > Debug > Edit configurations...
// On the left, click on '+', "Remote", with:
// Host: localhost
// Port: 5005
// Then click on "Debug"
#endif
return adb_execute(server->serial, cmd, sizeof(cmd) / sizeof(cmd[0]));
}
#define IPV4_LOCALHOST 0x7F000001
static socket_t
listen_on_port(uint16_t port) {
return net_listen(IPV4_LOCALHOST, port, 1);
}
static socket_t
connect_and_read_byte(uint16_t port) {
socket_t socket = net_connect(IPV4_LOCALHOST, port);
if (socket == INVALID_SOCKET) {
return INVALID_SOCKET;
}
char byte;
// the connection may succeed even if the server behind the "adb tunnel"
// is not listening, so read one byte to detect a working connection
if (net_recv(socket, &byte, 1) != 1) {
// the server is not listening yet behind the adb tunnel
net_close(socket);
return INVALID_SOCKET;
}
return socket;
}
static socket_t
connect_to_server(uint16_t port, uint32_t attempts, uint32_t delay) {
do {
LOGD("Remaining connection attempts: %d", (int) attempts);
socket_t socket = connect_and_read_byte(port);
if (socket != INVALID_SOCKET) {
// it worked!
return socket;
}
if (attempts) {
SDL_Delay(delay);
}
} while (--attempts > 0);
return INVALID_SOCKET;
}
static void
close_socket(socket_t *socket) {
SDL_assert(*socket != INVALID_SOCKET);
net_shutdown(*socket, SHUT_RDWR);
if (!net_close(*socket)) {
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LOGW("Could not close socket");
return;
}
*socket = INVALID_SOCKET;
}
void
server_init(struct server *server) {
*server = (struct server) SERVER_INITIALIZER;
}
bool
server_start(struct server *server, const char *serial,
const struct server_params *params) {
server->local_port = params->local_port;
if (serial) {
server->serial = SDL_strdup(serial);
if (!server->serial) {
return false;
}
}
if (!push_server(serial)) {
SDL_free(server->serial);
return false;
}
if (!enable_tunnel(server)) {
SDL_free(server->serial);
return false;
}
// if "adb reverse" does not work (e.g. over "adb connect"), it fallbacks to
// "adb forward", so the app socket is the client
if (!server->tunnel_forward) {
// At the application level, the device part is "the server" because it
// serves video stream and control. However, at the network level, the
// client listens and the server connects to the client. That way, the
// client can listen before starting the server app, so there is no
// need to try to connect until the server socket is listening on the
// device.
server->server_socket = listen_on_port(params->local_port);
if (server->server_socket == INVALID_SOCKET) {
LOGE("Could not listen on port %" PRIu16, params->local_port);
disable_tunnel(server);
SDL_free(server->serial);
return false;
}
}
// server will connect to our server socket
server->process = execute_server(server, params);
if (server->process == PROCESS_NONE) {
if (!server->tunnel_forward) {
close_socket(&server->server_socket);
}
disable_tunnel(server);
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SDL_free(server->serial);
return false;
}
server->tunnel_enabled = true;
return true;
}
bool
server_connect_to(struct server *server) {
if (!server->tunnel_forward) {
server->video_socket = net_accept(server->server_socket);
if (server->video_socket == INVALID_SOCKET) {
return false;
}
server->control_socket = net_accept(server->server_socket);
if (server->control_socket == INVALID_SOCKET) {
// the video_socket will be cleaned up on destroy
return false;
}
// we don't need the server socket anymore
close_socket(&server->server_socket);
} else {
uint32_t attempts = 100;
uint32_t delay = 100; // ms
server->video_socket =
connect_to_server(server->local_port, attempts, delay);
if (server->video_socket == INVALID_SOCKET) {
return false;
}
// we know that the device is listening, we don't need several attempts
server->control_socket =
net_connect(IPV4_LOCALHOST, server->local_port);
if (server->control_socket == INVALID_SOCKET) {
return false;
}
}
// we don't need the adb tunnel anymore
disable_tunnel(server); // ignore failure
server->tunnel_enabled = false;
return true;
}
void
server_stop(struct server *server) {
if (server->server_socket != INVALID_SOCKET) {
close_socket(&server->server_socket);
}
if (server->video_socket != INVALID_SOCKET) {
close_socket(&server->video_socket);
}
if (server->control_socket != INVALID_SOCKET) {
close_socket(&server->control_socket);
}
SDL_assert(server->process != PROCESS_NONE);
if (!cmd_terminate(server->process)) {
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LOGW("Could not terminate server");
}
cmd_simple_wait(server->process, NULL); // ignore exit code
LOGD("Server terminated");
if (server->tunnel_enabled) {
// ignore failure
disable_tunnel(server);
}
}
void
server_destroy(struct server *server) {
SDL_free(server->serial);
}