scrcpy/app/src/server.c

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#include "server.h"
#include <assert.h>
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <SDL2/SDL_timer.h>
#include <SDL2/SDL_platform.h>
#include "adb.h"
#include "util/file.h"
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#include "util/log.h"
#include "util/net_intr.h"
#include "util/process_intr.h"
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#include "util/str.h"
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#define SC_SERVER_FILENAME "scrcpy-server"
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#define SC_SERVER_PATH_DEFAULT PREFIX "/share/scrcpy/" SC_SERVER_FILENAME
#define SC_DEVICE_SERVER_PATH "/data/local/tmp/scrcpy-server.jar"
static char *
get_server_path(void) {
#ifdef __WINDOWS__
const wchar_t *server_path_env = _wgetenv(L"SCRCPY_SERVER_PATH");
#else
const char *server_path_env = getenv("SCRCPY_SERVER_PATH");
#endif
if (server_path_env) {
// if the envvar is set, use it
#ifdef __WINDOWS__
char *server_path = sc_str_from_wchars(server_path_env);
#else
char *server_path = strdup(server_path_env);
#endif
if (!server_path) {
LOGE("Could not allocate memory");
return NULL;
}
LOGD("Using SCRCPY_SERVER_PATH: %s", server_path);
return server_path;
}
#ifndef PORTABLE
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LOGD("Using server: " SC_SERVER_PATH_DEFAULT);
char *server_path = strdup(SC_SERVER_PATH_DEFAULT);
if (!server_path) {
LOGE("Could not allocate memory");
return NULL;
}
#else
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char *server_path = sc_file_get_local_path(SC_SERVER_FILENAME);
if (!server_path) {
LOGE("Could not get local file path, "
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"using " SC_SERVER_FILENAME " from current directory");
return strdup(SC_SERVER_FILENAME);
}
LOGD("Using server (portable): %s", server_path);
#endif
return server_path;
}
static void
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sc_server_params_destroy(struct sc_server_params *params) {
// The server stores a copy of the params provided by the user
free((char *) params->serial);
free((char *) params->crop);
free((char *) params->codec_options);
free((char *) params->encoder_name);
}
static bool
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sc_server_params_copy(struct sc_server_params *dst,
const struct sc_server_params *src) {
*dst = *src;
// The params reference user-allocated memory, so we must copy them to
// handle them from another thread
#define COPY(FIELD) \
dst->FIELD = NULL; \
if (src->FIELD) { \
dst->FIELD = strdup(src->FIELD); \
if (!dst->FIELD) { \
goto error; \
} \
}
COPY(serial);
COPY(crop);
COPY(codec_options);
COPY(encoder_name);
#undef COPY
return true;
error:
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sc_server_params_destroy(dst);
return false;
}
static bool
push_server(struct sc_intr *intr, const char *serial) {
char *server_path = get_server_path();
if (!server_path) {
return false;
}
if (!sc_file_is_regular(server_path)) {
LOGE("'%s' does not exist or is not a regular file\n", server_path);
free(server_path);
return false;
}
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sc_pid pid = adb_push(serial, server_path, SC_DEVICE_SERVER_PATH);
free(server_path);
return sc_process_check_success_intr(intr, pid, "adb push", true);
}
static const char *
log_level_to_server_string(enum sc_log_level level) {
switch (level) {
case SC_LOG_LEVEL_VERBOSE:
return "verbose";
case SC_LOG_LEVEL_DEBUG:
return "debug";
case SC_LOG_LEVEL_INFO:
return "info";
case SC_LOG_LEVEL_WARN:
return "warn";
case SC_LOG_LEVEL_ERROR:
return "error";
default:
assert(!"unexpected log level");
return "(unknown)";
}
}
static sc_pid
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execute_server(struct sc_server *server,
const struct sc_server_params *params) {
const char *serial = server->params.serial;
char max_size_string[6];
char bit_rate_string[11];
char max_fps_string[6];
char lock_video_orientation_string[5];
char display_id_string[11];
sprintf(max_size_string, "%"PRIu16, params->max_size);
sprintf(bit_rate_string, "%"PRIu32, params->bit_rate);
sprintf(max_fps_string, "%"PRIu16, params->max_fps);
sprintf(lock_video_orientation_string, "%"PRIi8,
params->lock_video_orientation);
sprintf(display_id_string, "%"PRIu32, params->display_id);
const char *const cmd[] = {
"shell",
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"CLASSPATH=" SC_DEVICE_SERVER_PATH,
"app_process",
#ifdef SERVER_DEBUGGER
# define SERVER_DEBUGGER_PORT "5005"
# ifdef SERVER_DEBUGGER_METHOD_NEW
/* Android 9 and above */
"-XjdwpProvider:internal -XjdwpOptions:transport=dt_socket,suspend=y,"
"server=y,address="
# else
/* Android 8 and below */
"-agentlib:jdwp=transport=dt_socket,suspend=y,server=y,address="
# endif
SERVER_DEBUGGER_PORT,
#endif
"/", // unused
"com.genymobile.scrcpy.Server",
SCRCPY_VERSION,
log_level_to_server_string(params->log_level),
max_size_string,
bit_rate_string,
max_fps_string,
lock_video_orientation_string,
server->tunnel.forward ? "true" : "false",
params->crop ? params->crop : "-",
"true", // always send frame meta (packet boundaries + timestamp)
params->control ? "true" : "false",
display_id_string,
params->show_touches ? "true" : "false",
params->stay_awake ? "true" : "false",
params->codec_options ? params->codec_options : "-",
params->encoder_name ? params->encoder_name : "-",
params->power_off_on_close ? "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(serial, cmd, ARRAY_LEN(cmd));
}
static bool
connect_and_read_byte(struct sc_intr *intr, sc_socket socket, uint16_t port) {
bool ok = net_connect_intr(intr, socket, IPV4_LOCALHOST, port);
if (!ok) {
return false;
}
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_intr(intr, socket, &byte, 1) != 1) {
// the server is not listening yet behind the adb tunnel
return false;
}
return true;
}
static sc_socket
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connect_to_server(struct sc_server *server, uint32_t attempts, sc_tick delay) {
uint16_t port = server->tunnel.local_port;
do {
LOGD("Remaining connection attempts: %d", (int) attempts);
sc_socket socket = net_socket();
if (socket != SC_SOCKET_NONE) {
bool ok = connect_and_read_byte(&server->intr, socket, port);
if (ok) {
// it worked!
return socket;
}
net_close(socket);
}
if (sc_intr_is_interrupted(&server->intr)) {
// Stop immediately
break;
}
if (attempts) {
sc_mutex_lock(&server->mutex);
sc_tick deadline = sc_tick_now() + delay;
bool timed_out = false;
while (!server->stopped && !timed_out) {
timed_out = !sc_cond_timedwait(&server->cond_stopped,
&server->mutex, deadline);
}
bool stopped = server->stopped;
sc_mutex_unlock(&server->mutex);
if (stopped) {
LOGI("Connection attempt stopped");
break;
}
}
} while (--attempts > 0);
return SC_SOCKET_NONE;
}
bool
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sc_server_init(struct sc_server *server, const struct sc_server_params *params,
const struct sc_server_callbacks *cbs, void *cbs_userdata) {
bool ok = sc_server_params_copy(&server->params, params);
if (!ok) {
LOGE("Could not copy server params");
return false;
}
ok = sc_mutex_init(&server->mutex);
if (!ok) {
LOGE("Could not create server mutex");
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sc_server_params_destroy(&server->params);
return false;
}
ok = sc_cond_init(&server->cond_stopped);
if (!ok) {
LOGE("Could not create server cond_stopped");
sc_mutex_destroy(&server->mutex);
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sc_server_params_destroy(&server->params);
return false;
}
ok = sc_intr_init(&server->intr);
if (!ok) {
LOGE("Could not create intr");
sc_cond_destroy(&server->cond_stopped);
sc_mutex_destroy(&server->mutex);
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sc_server_params_destroy(&server->params);
return false;
}
server->stopped = false;
server->video_socket = SC_SOCKET_NONE;
server->control_socket = SC_SOCKET_NONE;
sc_adb_tunnel_init(&server->tunnel);
assert(cbs);
assert(cbs->on_connection_failed);
assert(cbs->on_connected);
assert(cbs->on_disconnected);
server->cbs = cbs;
server->cbs_userdata = cbs_userdata;
return true;
}
static bool
device_read_info(struct sc_intr *intr, sc_socket device_socket,
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struct sc_server_info *info) {
unsigned char buf[SC_DEVICE_NAME_FIELD_LENGTH + 4];
ssize_t r = net_recv_all_intr(intr, device_socket, buf, sizeof(buf));
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if (r < SC_DEVICE_NAME_FIELD_LENGTH + 4) {
LOGE("Could not retrieve device information");
return false;
}
// in case the client sends garbage
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buf[SC_DEVICE_NAME_FIELD_LENGTH - 1] = '\0';
memcpy(info->device_name, (char *) buf, sizeof(info->device_name));
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info->frame_size.width = (buf[SC_DEVICE_NAME_FIELD_LENGTH] << 8)
| buf[SC_DEVICE_NAME_FIELD_LENGTH + 1];
info->frame_size.height = (buf[SC_DEVICE_NAME_FIELD_LENGTH + 2] << 8)
| buf[SC_DEVICE_NAME_FIELD_LENGTH + 3];
return true;
}
static bool
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sc_server_connect_to(struct sc_server *server, struct sc_server_info *info) {
struct sc_adb_tunnel *tunnel = &server->tunnel;
assert(tunnel->enabled);
const char *serial = server->params.serial;
sc_socket video_socket = SC_SOCKET_NONE;
sc_socket control_socket = SC_SOCKET_NONE;
if (!tunnel->forward) {
video_socket = net_accept_intr(&server->intr, tunnel->server_socket);
if (video_socket == SC_SOCKET_NONE) {
goto fail;
}
control_socket = net_accept_intr(&server->intr, tunnel->server_socket);
if (control_socket == SC_SOCKET_NONE) {
goto fail;
}
} else {
uint32_t attempts = 100;
sc_tick delay = SC_TICK_FROM_MS(100);
video_socket = connect_to_server(server, attempts, delay);
if (video_socket == SC_SOCKET_NONE) {
goto fail;
}
// we know that the device is listening, we don't need several attempts
control_socket = net_socket();
if (control_socket == SC_SOCKET_NONE) {
goto fail;
}
bool ok = net_connect_intr(&server->intr, control_socket,
IPV4_LOCALHOST, tunnel->local_port);
if (!ok) {
goto fail;
}
}
// we don't need the adb tunnel anymore
sc_adb_tunnel_close(tunnel, &server->intr, serial);
// The sockets will be closed on stop if device_read_info() fails
bool ok = device_read_info(&server->intr, video_socket, info);
if (!ok) {
goto fail;
}
assert(video_socket != SC_SOCKET_NONE);
assert(control_socket != SC_SOCKET_NONE);
server->video_socket = video_socket;
server->control_socket = control_socket;
return true;
fail:
if (video_socket != SC_SOCKET_NONE) {
if (!net_close(video_socket)) {
LOGW("Could not close video socket");
}
}
if (control_socket != SC_SOCKET_NONE) {
if (!net_close(control_socket)) {
LOGW("Could not close control socket");
}
}
// Always leave this function with tunnel disabled
sc_adb_tunnel_close(tunnel, &server->intr, serial);
return false;
}
static void
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sc_server_on_terminated(void *userdata) {
struct sc_server *server = userdata;
// If the server process dies before connecting to the server socket,
// then the client will be stuck forever on accept(). To avoid the problem,
// wake up the accept() call (or any other) when the server dies, like on
// stop() (it is safe to call interrupt() twice).
sc_intr_interrupt(&server->intr);
server->cbs->on_disconnected(server, server->cbs_userdata);
LOGD("Server terminated");
}
static char *
sc_server_get_serialno(struct sc_intr *intr) {
sc_pipe pout;
sc_pid pid = adb_get_serialno(&pout);
if (pid == SC_PROCESS_NONE) {
return false;
}
char buf[128];
ssize_t r = sc_pipe_read_all_intr(intr, pid, pout, buf, sizeof(buf));
sc_pipe_close(pout);
bool ok =
sc_process_check_success_intr(intr, pid, "adb get-serialno", true);
if (!ok) {
return NULL;
}
sc_str_truncate(buf, r, " \r\n");
return strdup(buf);
}
static bool
sc_server_fill_serial(struct sc_server *server) {
// Retrieve the actual device immediately if not provided, so that all
// future adb commands are executed for this specific device, even if other
// devices are connected afterwards (without "more than one
// device/emulator" error)
if (!server->params.serial) {
// The serial is owned by sc_server_params, and will be freed on destroy
server->params.serial = sc_server_get_serialno(&server->intr);
if (!server->params.serial) {
LOGE("Could not get device serial");
return false;
}
}
return true;
}
static int
run_server(void *data) {
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struct sc_server *server = data;
if (!sc_server_fill_serial(server)) {
goto error_connection_failed;
}
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const struct sc_server_params *params = &server->params;
LOGD("Device serial: %s", params->serial);
bool ok = push_server(&server->intr, params->serial);
if (!ok) {
goto error_connection_failed;
}
ok = sc_adb_tunnel_open(&server->tunnel, &server->intr, params->serial,
params->port_range, params->force_adb_forward);
if (!ok) {
goto error_connection_failed;
}
// server will connect to our server socket
sc_pid pid = execute_server(server, params);
if (pid == SC_PROCESS_NONE) {
sc_adb_tunnel_close(&server->tunnel, &server->intr, params->serial);
goto error_connection_failed;
}
static const struct sc_process_listener listener = {
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.on_terminated = sc_server_on_terminated,
};
struct sc_process_observer observer;
ok = sc_process_observer_init(&observer, pid, &listener, server);
if (!ok) {
sc_process_terminate(pid);
sc_process_wait(pid, true); // ignore exit code
sc_adb_tunnel_close(&server->tunnel, &server->intr, params->serial);
goto error_connection_failed;
}
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ok = sc_server_connect_to(server, &server->info);
// The tunnel is always closed by server_connect_to()
if (!ok) {
sc_process_terminate(pid);
sc_process_wait(pid, true); // ignore exit code
sc_process_observer_join(&observer);
sc_process_observer_destroy(&observer);
goto error_connection_failed;
}
// Now connected
server->cbs->on_connected(server, server->cbs_userdata);
// Wait for server_stop()
sc_mutex_lock(&server->mutex);
while (!server->stopped) {
sc_cond_wait(&server->cond_stopped, &server->mutex);
}
sc_mutex_unlock(&server->mutex);
// Give some delay for the server to terminate properly
#define WATCHDOG_DELAY SC_TICK_FROM_SEC(1)
sc_tick deadline = sc_tick_now() + WATCHDOG_DELAY;
bool terminated = sc_process_observer_timedwait(&observer, deadline);
// After this delay, kill the server if it's not dead already.
// On some devices, closing the sockets is not sufficient to wake up the
// blocking calls while the device is asleep.
if (!terminated) {
// The process may have terminated since the check, but it is not
// reaped (closed) yet, so its PID is still valid, and it is ok to call
// sc_process_terminate() even in that case.
LOGW("Killing the server...");
sc_process_terminate(pid);
}
sc_process_observer_join(&observer);
sc_process_observer_destroy(&observer);
sc_process_close(pid);
return 0;
error_connection_failed:
server->cbs->on_connection_failed(server, server->cbs_userdata);
return -1;
}
bool
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sc_server_start(struct sc_server *server) {
bool ok = sc_thread_create(&server->thread, run_server, "server", server);
if (!ok) {
LOGE("Could not create server thread");
return false;
}
return true;
}
void
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sc_server_stop(struct sc_server *server) {
sc_mutex_lock(&server->mutex);
server->stopped = true;
sc_cond_signal(&server->cond_stopped);
sc_intr_interrupt(&server->intr);
sc_mutex_unlock(&server->mutex);
sc_thread_join(&server->thread, NULL);
}
void
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sc_server_destroy(struct sc_server *server) {
sc_server_params_destroy(&server->params);
sc_intr_destroy(&server->intr);
sc_cond_destroy(&server->cond_stopped);
sc_mutex_destroy(&server->mutex);
}