scrcpy/app/src/server.c

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#include "server.h"
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <SDL2/SDL_assert.h>
#include <SDL2/SDL_timer.h>
#include "config.h"
#include "log.h"
#include "net.h"
#define SOCKET_NAME "scrcpy"
#ifdef OVERRIDE_SERVER_PATH
# define DEFAULT_SERVER_PATH OVERRIDE_SERVER_PATH
#else
# define DEFAULT_SERVER_PATH PREFIX PREFIXED_SERVER_PATH
#endif
#define DEVICE_SERVER_PATH "/data/local/tmp/scrcpy-server.jar"
static const char *
get_server_path(void) {
const char *server_path = getenv("SCRCPY_SERVER_PATH");
if (!server_path) {
server_path = DEFAULT_SERVER_PATH;
}
return server_path;
}
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(const char *serial,
uint16_t max_size, uint32_t bit_rate,
bool tunnel_forward, const char *crop,
bool send_frame_meta) {
char max_size_string[6];
char bit_rate_string[11];
sprintf(max_size_string, "%"PRIu16, max_size);
sprintf(bit_rate_string, "%"PRIu32, bit_rate);
const char *const cmd[] = {
"shell",
"CLASSPATH=/data/local/tmp/scrcpy-server.jar",
"app_process",
"/", // unused
"com.genymobile.scrcpy.Server",
max_size_string,
bit_rate_string,
tunnel_forward ? "true" : "false",
crop ? crop : "-",
send_frame_meta ? "true" : "false",
};
return adb_execute(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_all(socket, &byte, 1) != 1) {
// the server is not listening yet behind the adb tunnel
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)) {
LOGW("Cannot 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,
uint16_t local_port, uint16_t max_size, uint32_t bit_rate,
const char *crop, bool send_frame_meta) {
server->local_port = 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(local_port);
if (server->server_socket == INVALID_SOCKET) {
LOGE("Could not listen on port %" PRIu16, local_port);
disable_tunnel(server);
SDL_free(server->serial);
return false;
}
}
// server will connect to our server socket
server->process = execute_server(serial, max_size, bit_rate,
server->tunnel_forward, crop,
send_frame_meta);
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;
}
socket_t
server_connect_to(struct server *server) {
if (!server->tunnel_forward) {
server->device_socket = net_accept(server->server_socket);
} else {
uint32_t attempts = 100;
uint32_t delay = 100; // ms
server->device_socket = connect_to_server(server->local_port, attempts,
delay);
}
if (server->device_socket == INVALID_SOCKET) {
return INVALID_SOCKET;
}
if (!server->tunnel_forward) {
// we don't need the server socket anymore
close_socket(&server->server_socket);
}
// we don't need the adb tunnel anymore
disable_tunnel(server); // ignore failure
server->tunnel_enabled = false;
return server->device_socket;
}
void
server_stop(struct server *server) {
SDL_assert(server->process != PROCESS_NONE);
if (!cmd_terminate(server->process)) {
LOGW("Cannot 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) {
if (server->server_socket != INVALID_SOCKET) {
close_socket(&server->server_socket);
}
if (server->device_socket != INVALID_SOCKET) {
close_socket(&server->device_socket);
}
SDL_free(server->serial);
}