shadow_server.c

 
#include <freerdp/config.h>
 
#include <errno.h>
#include <stdint.h>
 
#include <winpr/assert.h>
#include <winpr/crt.h>
#include <winpr/ssl.h>
#include <winpr/path.h>
#include <winpr/cmdline.h>
#include <winpr/winsock.h>
 
#include <freerdp/log.h>
#include <freerdp/version.h>
 
#include <winpr/tools/makecert.h>
 
#ifndef _WIN32
#include <sys/select.h>
#include <signal.h>
#endif
 
#include "shadow.h"
 
#define TAG SERVER_TAG("shadow")
 
static const char bind_address[] = "bind-address,";
 
#define fail_at(arg, rc) fail_at_((arg), (rc), __FILE__, __func__, __LINE__)
static int fail_at_(const COMMAND_LINE_ARGUMENT_A* arg, int rc, const char* file, const char* fkt,
                    size_t line)
{
  const DWORD level = WLOG_ERROR;
  wLog* log = WLog_Get(TAG);
  if (WLog_IsLevelActive(log, level))
    WLog_PrintMessage(log, WLOG_MESSAGE_TEXT, level, line, file, fkt,
                      "Command line parsing failed at '%s' value '%s' [%d]", arg->Name,
                      arg->Value, rc);
  return rc;
}
 
static int command_line_compare(const void* pa, const void* pb)
{
  const COMMAND_LINE_ARGUMENT_A* a = pa;
  const COMMAND_LINE_ARGUMENT_A* b = pb;
 
  if (!a && !b)
    return 0;
  if (!a)
    return -1;
  if (!b)
    return 1;
 
  return strcmp(a->Name, b->Name);
}
 
static int shadow_server_print_command_line_help(int argc, char** argv,
                                                 const COMMAND_LINE_ARGUMENT_A* largs)
{
  if ((argc < 1) || !largs || !argv)
    return -1;
 
  {
    char* path = winpr_GetConfigFilePath(TRUE, "SAM");
    printf("Usage: %s [options]\n", argv[0]);
    printf("\n");
    printf("Notes: By default NLA security is active.\n");
    printf("\tIn this mode a SAM database is required.\n");
    printf("\tProvide one with /sam-file:<file with path>\n");
    printf("\telse the default path %s is used.\n", path);
    printf("\tIf there is no existing SAM file authentication for all users will fail.\n");
    printf("\n\tIf authentication against PAM is desired, start with -sec-nla (requires "
           "compiled in "
           "support for PAM)\n\n");
    printf("Syntax:\n");
    printf("    /flag (enables flag)\n");
    printf("    /option:<value> (specifies option with value)\n");
    printf("    +toggle -toggle (enables or disables toggle, where '/' is a synonym of '+')\n");
    printf("\n");
    free(path);
  }
 
  // TODO: Sort arguments
  size_t nrArgs = 0;
  {
    const COMMAND_LINE_ARGUMENT_A* arg = largs;
    while (arg->Name != NULL)
    {
      nrArgs++;
      arg++;
    }
    nrArgs++;
  }
  COMMAND_LINE_ARGUMENT_A* args_copy = calloc(nrArgs, sizeof(COMMAND_LINE_ARGUMENT_A));
  if (!args_copy)
    return -1;
  memcpy(args_copy, largs, nrArgs * sizeof(COMMAND_LINE_ARGUMENT_A));
  qsort(args_copy, nrArgs - 1, sizeof(COMMAND_LINE_ARGUMENT_A), command_line_compare);
 
  const COMMAND_LINE_ARGUMENT_A* arg = args_copy;
 
  int rc = -1;
  do
  {
    if (arg->Flags & COMMAND_LINE_VALUE_FLAG)
    {
      printf("    %s", "/");
      printf("%-20s\n", arg->Name);
      printf("\t%s\n", arg->Text);
    }
    else if ((arg->Flags & COMMAND_LINE_VALUE_REQUIRED) ||
             (arg->Flags & COMMAND_LINE_VALUE_OPTIONAL))
    {
      printf("    %s", "/");
 
      if (arg->Format)
      {
        const size_t length = (strlen(arg->Name) + strlen(arg->Format) + 2);
        char* str = (char*)calloc(length + 1, sizeof(char));
 
        if (!str)
          goto fail;
 
        (void)sprintf_s(str, length + 1, "%s:%s", arg->Name, arg->Format);
        (void)printf("%-20s\n", str);
        free(str);
      }
      else
      {
        printf("%-20s\n", arg->Name);
      }
 
      printf("\t%s\n", arg->Text);
    }
    else if (arg->Flags & COMMAND_LINE_VALUE_BOOL)
    {
      const size_t length = strlen(arg->Name) + 32;
      char* str = calloc(length + 1, sizeof(char));
 
      if (!str)
        goto fail;
 
      (void)sprintf_s(str, length + 1, "%s (default:%s)", arg->Name,
                      arg->Default ? "on" : "off");
      (void)printf("    %s", arg->Default ? "-" : "+");
      (void)printf("%-20s\n", str);
      (void)printf("\t%s\n", arg->Text);
 
      free(str);
    }
  } while ((arg = CommandLineFindNextArgumentA(arg)) != NULL);
 
  rc = 1;
fail:
  free(args_copy);
  return rc;
}
 
int shadow_server_command_line_status_print(rdpShadowServer* server, int argc, char** argv,
                                            int status, const COMMAND_LINE_ARGUMENT_A* cargs)
{
  WINPR_UNUSED(server);
 
  if (status == COMMAND_LINE_STATUS_PRINT_VERSION)
  {
    printf("FreeRDP version %s (git %s)\n", FREERDP_VERSION_FULL, FREERDP_GIT_REVISION);
    return COMMAND_LINE_STATUS_PRINT_VERSION;
  }
  else if (status == COMMAND_LINE_STATUS_PRINT_BUILDCONFIG)
  {
    printf("%s\n", freerdp_get_build_config());
    return COMMAND_LINE_STATUS_PRINT_BUILDCONFIG;
  }
  else if (status == COMMAND_LINE_STATUS_PRINT)
  {
    return COMMAND_LINE_STATUS_PRINT;
  }
  else if (status < 0)
  {
    if (shadow_server_print_command_line_help(argc, argv, cargs) < 0)
      return -1;
 
    return COMMAND_LINE_STATUS_PRINT_HELP;
  }
 
  return 1;
}
 
int shadow_server_parse_command_line(rdpShadowServer* server, int argc, char** argv,
                                     COMMAND_LINE_ARGUMENT_A* cargs)
{
  int status = 0;
  DWORD flags = 0;
  const COMMAND_LINE_ARGUMENT_A* arg = NULL;
  rdpSettings* settings = server->settings;
 
  if ((argc < 2) || !argv || !cargs)
    return 1;
 
  CommandLineClearArgumentsA(cargs);
  flags = COMMAND_LINE_SEPARATOR_COLON;
  flags |= COMMAND_LINE_SIGIL_SLASH | COMMAND_LINE_SIGIL_PLUS_MINUS;
  status = CommandLineParseArgumentsA(argc, argv, cargs, flags, server, NULL, NULL);
 
  if (status < 0)
    return status;
 
  arg = cargs;
  errno = 0;
 
  do
  {
    if (!(arg->Flags & COMMAND_LINE_ARGUMENT_PRESENT))
      continue;
 
    CommandLineSwitchStart(arg) CommandLineSwitchCase(arg, "port")
    {
      long val = strtol(arg->Value, NULL, 0);
 
      if ((errno != 0) || (val <= 0) || (val > UINT16_MAX))
        return fail_at(arg, COMMAND_LINE_ERROR);
 
      server->port = (DWORD)val;
    }
    CommandLineSwitchCase(arg, "ipc-socket")
    {
      /* /bind-address is incompatible */
      if (server->ipcSocket)
        return fail_at(arg, COMMAND_LINE_ERROR);
      server->ipcSocket = _strdup(arg->Value);
 
      if (!server->ipcSocket)
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "bind-address")
    {
      int rc = 0;
      size_t len = strlen(arg->Value) + sizeof(bind_address);
      /* /ipc-socket is incompatible */
      if (server->ipcSocket)
        return fail_at(arg, COMMAND_LINE_ERROR);
      server->ipcSocket = calloc(len, sizeof(CHAR));
 
      if (!server->ipcSocket)
        return fail_at(arg, COMMAND_LINE_ERROR);
 
      rc = _snprintf(server->ipcSocket, len, "%s%s", bind_address, arg->Value);
      if ((rc < 0) || ((size_t)rc != len - 1))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "may-view")
    {
      server->mayView = arg->Value ? TRUE : FALSE;
    }
    CommandLineSwitchCase(arg, "bitmap-compat")
    {
      server->SupportMultiRectBitmapUpdates = arg->Value ? FALSE : TRUE;
    }
    CommandLineSwitchCase(arg, "may-interact")
    {
      server->mayInteract = arg->Value ? TRUE : FALSE;
    }
    CommandLineSwitchCase(arg, "server-side-cursor")
    {
      server->ShowMouseCursor = arg->Value ? TRUE : FALSE;
    }
    CommandLineSwitchCase(arg, "mouse-relative")
    {
      const BOOL val = arg->Value ? TRUE : FALSE;
      if (!freerdp_settings_set_bool(settings, FreeRDP_MouseUseRelativeMove, val) ||
          !freerdp_settings_set_bool(settings, FreeRDP_HasRelativeMouseEvent, val))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "max-connections")
    {
      errno = 0;
      unsigned long val = strtoul(arg->Value, NULL, 0);
 
      if ((errno != 0) || (val > UINT32_MAX))
        return fail_at(arg, COMMAND_LINE_ERROR);
      server->maxClientsConnected = val;
    }
    CommandLineSwitchCase(arg, "rect")
    {
      char* p = NULL;
      char* tok[4];
      long x = -1;
      long y = -1;
      long w = -1;
      long h = -1;
      char* str = _strdup(arg->Value);
 
      if (!str)
        return fail_at(arg, COMMAND_LINE_ERROR);
 
      tok[0] = p = str;
      p = strchr(p + 1, ',');
 
      if (!p)
      {
        free(str);
        return fail_at(arg, COMMAND_LINE_ERROR);
      }
 
      *p++ = '\0';
      tok[1] = p;
      p = strchr(p + 1, ',');
 
      if (!p)
      {
        free(str);
        return fail_at(arg, COMMAND_LINE_ERROR);
      }
 
      *p++ = '\0';
      tok[2] = p;
      p = strchr(p + 1, ',');
 
      if (!p)
      {
        free(str);
        return fail_at(arg, COMMAND_LINE_ERROR);
      }
 
      *p++ = '\0';
      tok[3] = p;
      x = strtol(tok[0], NULL, 0);
 
      if (errno != 0)
        goto fail;
 
      y = strtol(tok[1], NULL, 0);
 
      if (errno != 0)
        goto fail;
 
      w = strtol(tok[2], NULL, 0);
 
      if (errno != 0)
        goto fail;
 
      h = strtol(tok[3], NULL, 0);
 
      if (errno != 0)
        goto fail;
 
    fail:
      free(str);
 
      if ((x < 0) || (y < 0) || (w < 1) || (h < 1) || (errno != 0))
        return fail_at(arg, COMMAND_LINE_ERROR);
 
      if ((x > UINT16_MAX) || (y > UINT16_MAX) || (x + w > UINT16_MAX) ||
          (y + h > UINT16_MAX))
        return fail_at(arg, COMMAND_LINE_ERROR);
      server->subRect.left = (UINT16)x;
      server->subRect.top = (UINT16)y;
      server->subRect.right = (UINT16)(x + w);
      server->subRect.bottom = (UINT16)(y + h);
      server->shareSubRect = TRUE;
    }
    CommandLineSwitchCase(arg, "auth")
    {
      server->authentication = arg->Value ? TRUE : FALSE;
    }
    CommandLineSwitchCase(arg, "remote-guard")
    {
      if (!freerdp_settings_set_bool(settings, FreeRDP_RemoteCredentialGuard,
                                     arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "restricted-admin")
    {
      if (!freerdp_settings_set_bool(settings, FreeRDP_RestrictedAdminModeSupported,
                                     arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "vmconnect")
    {
      if (!freerdp_settings_set_bool(settings, FreeRDP_VmConnectMode,
                                     arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "sec")
    {
      if (strcmp("rdp", arg->Value) == 0) /* Standard RDP */
      {
        if (!freerdp_settings_set_bool(settings, FreeRDP_RdpSecurity, TRUE))
          return fail_at(arg, COMMAND_LINE_ERROR);
        if (!freerdp_settings_set_bool(settings, FreeRDP_TlsSecurity, FALSE))
          return fail_at(arg, COMMAND_LINE_ERROR);
        if (!freerdp_settings_set_bool(settings, FreeRDP_NlaSecurity, FALSE))
          return fail_at(arg, COMMAND_LINE_ERROR);
        if (!freerdp_settings_set_bool(settings, FreeRDP_ExtSecurity, FALSE))
          return fail_at(arg, COMMAND_LINE_ERROR);
        if (!freerdp_settings_set_bool(settings, FreeRDP_UseRdpSecurityLayer, TRUE))
          return fail_at(arg, COMMAND_LINE_ERROR);
      }
      else if (strcmp("tls", arg->Value) == 0) /* TLS */
      {
        if (!freerdp_settings_set_bool(settings, FreeRDP_RdpSecurity, FALSE))
          return fail_at(arg, COMMAND_LINE_ERROR);
        if (!freerdp_settings_set_bool(settings, FreeRDP_TlsSecurity, TRUE))
          return fail_at(arg, COMMAND_LINE_ERROR);
        if (!freerdp_settings_set_bool(settings, FreeRDP_NlaSecurity, FALSE))
          return fail_at(arg, COMMAND_LINE_ERROR);
        if (!freerdp_settings_set_bool(settings, FreeRDP_ExtSecurity, FALSE))
          return fail_at(arg, COMMAND_LINE_ERROR);
      }
      else if (strcmp("nla", arg->Value) == 0) /* NLA */
      {
        if (!freerdp_settings_set_bool(settings, FreeRDP_RdpSecurity, FALSE))
          return fail_at(arg, COMMAND_LINE_ERROR);
        if (!freerdp_settings_set_bool(settings, FreeRDP_TlsSecurity, FALSE))
          return fail_at(arg, COMMAND_LINE_ERROR);
        if (!freerdp_settings_set_bool(settings, FreeRDP_NlaSecurity, TRUE))
          return fail_at(arg, COMMAND_LINE_ERROR);
        if (!freerdp_settings_set_bool(settings, FreeRDP_ExtSecurity, FALSE))
          return fail_at(arg, COMMAND_LINE_ERROR);
      }
      else if (strcmp("ext", arg->Value) == 0) /* NLA Extended */
      {
        if (!freerdp_settings_set_bool(settings, FreeRDP_RdpSecurity, FALSE))
          return fail_at(arg, COMMAND_LINE_ERROR);
        if (!freerdp_settings_set_bool(settings, FreeRDP_TlsSecurity, FALSE))
          return fail_at(arg, COMMAND_LINE_ERROR);
        if (!freerdp_settings_set_bool(settings, FreeRDP_NlaSecurity, FALSE))
          return fail_at(arg, COMMAND_LINE_ERROR);
        if (!freerdp_settings_set_bool(settings, FreeRDP_ExtSecurity, TRUE))
          return fail_at(arg, COMMAND_LINE_ERROR);
      }
      else
      {
        WLog_ERR(TAG, "unknown protocol security: %s", arg->Value);
        return fail_at(arg, COMMAND_LINE_ERROR_UNEXPECTED_VALUE);
      }
    }
    CommandLineSwitchCase(arg, "sec-rdp")
    {
      if (!freerdp_settings_set_bool(settings, FreeRDP_RdpSecurity,
                                     arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "sec-tls")
    {
      if (!freerdp_settings_set_bool(settings, FreeRDP_TlsSecurity,
                                     arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "sec-nla")
    {
      if (!freerdp_settings_set_bool(settings, FreeRDP_NlaSecurity,
                                     arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "sec-ext")
    {
      if (!freerdp_settings_set_bool(settings, FreeRDP_ExtSecurity,
                                     arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "sam-file")
    {
      if (!freerdp_settings_set_string(settings, FreeRDP_NtlmSamFile, arg->Value))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "log-level")
    {
      wLog* root = WLog_GetRoot();
 
      if (!WLog_SetStringLogLevel(root, arg->Value))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "log-filters")
    {
      if (!WLog_AddStringLogFilters(arg->Value))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "nsc")
    {
      if (!freerdp_settings_set_bool(settings, FreeRDP_NSCodec, arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "rfx")
    {
      if (!freerdp_settings_set_bool(settings, FreeRDP_RemoteFxCodec,
                                     arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "gfx")
    {
      if (!freerdp_settings_set_bool(settings, FreeRDP_SupportGraphicsPipeline,
                                     arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "gfx-progressive")
    {
      if (!freerdp_settings_set_bool(settings, FreeRDP_GfxProgressive,
                                     arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "gfx-rfx")
    {
      if (!freerdp_settings_set_bool(settings, FreeRDP_RemoteFxCodec,
                                     arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "gfx-planar")
    {
      if (!freerdp_settings_set_bool(settings, FreeRDP_GfxPlanar, arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "gfx-avc420")
    {
      if (!freerdp_settings_set_bool(settings, FreeRDP_GfxH264, arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "gfx-avc444")
    {
      if (!freerdp_settings_set_bool(settings, FreeRDP_GfxAVC444v2,
                                     arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
      if (!freerdp_settings_set_bool(settings, FreeRDP_GfxAVC444, arg->Value ? TRUE : FALSE))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "keytab")
    {
      if (!freerdp_settings_set_string(settings, FreeRDP_KerberosKeytab, arg->Value))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "ccache")
    {
      if (!freerdp_settings_set_string(settings, FreeRDP_KerberosCache, arg->Value))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchCase(arg, "tls-secrets-file")
    {
      if (!freerdp_settings_set_string(settings, FreeRDP_TlsSecretsFile, arg->Value))
        return fail_at(arg, COMMAND_LINE_ERROR);
    }
    CommandLineSwitchDefault(arg)
    {
    }
    CommandLineSwitchEnd(arg)
  } while ((arg = CommandLineFindNextArgumentA(arg)) != NULL);
 
  arg = CommandLineFindArgumentA(cargs, "monitors");
 
  if (arg && (arg->Flags & COMMAND_LINE_ARGUMENT_PRESENT))
  {
    UINT32 numMonitors = 0;
    MONITOR_DEF monitors[16] = { 0 };
    numMonitors = shadow_enum_monitors(monitors, 16);
 
    if (arg->Flags & COMMAND_LINE_VALUE_PRESENT)
    {
      /* Select monitors */
      long val = strtol(arg->Value, NULL, 0);
 
      if ((val < 0) || (errno != 0) || ((UINT32)val >= numMonitors))
        status = COMMAND_LINE_STATUS_PRINT;
 
      server->selectedMonitor = (UINT32)val;
    }
    else
    {
      /* List monitors */
 
      for (UINT32 index = 0; index < numMonitors; index++)
      {
        const MONITOR_DEF* monitor = &monitors[index];
        const INT64 width = monitor->right - monitor->left + 1;
        const INT64 height = monitor->bottom - monitor->top + 1;
        WLog_INFO(TAG, "      %s [%d] %" PRId64 "x%" PRId64 "\t+%" PRId32 "+%" PRId32 "",
                  (monitor->flags == 1) ? "*" : " ", index, width, height, monitor->left,
                  monitor->top);
      }
 
      status = COMMAND_LINE_STATUS_PRINT;
    }
  }
 
  /* If we want to disable authentication we need to ensure that NLA security
   * is not activated. Only TLS and RDP security allow anonymous login.
   */
  if (!server->authentication && !freerdp_settings_get_bool(settings, FreeRDP_VmConnectMode))
  {
    if (!freerdp_settings_set_bool(settings, FreeRDP_NlaSecurity, FALSE))
      return COMMAND_LINE_ERROR;
  }
  return status;
}
 
static DWORD WINAPI shadow_server_thread(LPVOID arg)
{
  rdpShadowServer* server = (rdpShadowServer*)arg;
  BOOL running = TRUE;
  DWORD status = 0;
  freerdp_listener* listener = server->listener;
  shadow_subsystem_start(server->subsystem);
 
  while (running)
  {
    HANDLE events[MAXIMUM_WAIT_OBJECTS] = { 0 };
    DWORD nCount = 0;
    events[nCount++] = server->StopEvent;
    nCount += listener->GetEventHandles(listener, &events[nCount], ARRAYSIZE(events) - nCount);
 
    if (nCount <= 1)
    {
      WLog_ERR(TAG, "Failed to get FreeRDP file descriptor");
      break;
    }
 
    status = WaitForMultipleObjects(nCount, events, FALSE, INFINITE);
 
    switch (status)
    {
      case WAIT_FAILED:
      case WAIT_OBJECT_0:
        running = FALSE;
        break;
 
      default:
      {
        if (!listener->CheckFileDescriptor(listener))
        {
          WLog_ERR(TAG, "Failed to check FreeRDP file descriptor");
          running = FALSE;
        }
        else
        {
#ifdef _WIN32
          Sleep(100); /* FIXME: listener event handles */
#endif
        }
      }
      break;
    }
  }
 
  listener->Close(listener);
  shadow_subsystem_stop(server->subsystem);
 
  /* Signal to the clients that server is being stopped and wait for them
   * to disconnect. */
  if (shadow_client_boardcast_quit(server, 0))
  {
    while (ArrayList_Count(server->clients) > 0)
    {
      Sleep(100);
    }
  }
 
  ExitThread(0);
  return 0;
}
 
static BOOL open_port(rdpShadowServer* server, char* address)
{
  BOOL status = 0;
  char* modaddr = address;
 
  if (modaddr)
  {
    if (modaddr[0] == '[')
    {
      char* end = strchr(address, ']');
      if (!end)
      {
        WLog_ERR(TAG, "Could not parse bind-address %s", address);
        return -1;
      }
      *end++ = '\0';
      if (strlen(end) > 0)
      {
        WLog_ERR(TAG, "Excess data after IPv6 address: '%s'", end);
        return -1;
      }
      modaddr++;
    }
  }
  status = server->listener->Open(server->listener, modaddr, (UINT16)server->port);
 
  if (!status)
  {
    WLog_ERR(TAG,
             "Problem creating TCP listener. (Port already used or insufficient permissions?)");
  }
 
  return status;
}
 
int shadow_server_start(rdpShadowServer* server)
{
  BOOL ipc = 0;
  BOOL status = 0;
  WSADATA wsaData;
 
  if (!server)
    return -1;
 
  if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
    return -1;
 
#ifndef _WIN32
  (void)signal(SIGPIPE, SIG_IGN);
#endif
  server->screen = shadow_screen_new(server);
 
  if (!server->screen)
  {
    WLog_ERR(TAG, "screen_new failed");
    return -1;
  }
 
  server->capture = shadow_capture_new(server);
 
  if (!server->capture)
  {
    WLog_ERR(TAG, "capture_new failed");
    return -1;
  }
 
  /* Bind magic:
   *
   * empty                 ... bind TCP all
   * <local path>          ... bind local (IPC)
   * bind-socket,<address> ... bind TCP to specified interface
   */
  ipc = server->ipcSocket && (strncmp(bind_address, server->ipcSocket,
                                      strnlen(bind_address, sizeof(bind_address))) != 0);
  if (!ipc)
  {
    size_t count = 0;
 
    char** ptr = CommandLineParseCommaSeparatedValuesEx(NULL, server->ipcSocket, &count);
    if (!ptr || (count <= 1))
    {
      if (server->ipcSocket == NULL)
      {
        if (!open_port(server, NULL))
        {
          CommandLineParserFree(ptr);
          return -1;
        }
      }
      else
      {
        CommandLineParserFree(ptr);
        return -1;
      }
    }
 
    WINPR_ASSERT(ptr || (count == 0));
    for (size_t x = 1; x < count; x++)
    {
      BOOL success = open_port(server, ptr[x]);
      if (!success)
      {
        CommandLineParserFree(ptr);
        return -1;
      }
    }
    CommandLineParserFree(ptr);
  }
  else
  {
    status = server->listener->OpenLocal(server->listener, server->ipcSocket);
 
    if (!status)
    {
      WLog_ERR(TAG, "Problem creating local socket listener. (Port already used or "
                    "insufficient permissions?)");
      return -1;
    }
  }
 
  if (!(server->thread = CreateThread(NULL, 0, shadow_server_thread, (void*)server, 0, NULL)))
  {
    return -1;
  }
 
  return 0;
}
 
int shadow_server_stop(rdpShadowServer* server)
{
  if (!server)
    return -1;
 
  if (server->thread)
  {
    (void)SetEvent(server->StopEvent);
    (void)WaitForSingleObject(server->thread, INFINITE);
    (void)CloseHandle(server->thread);
    server->thread = NULL;
    if (server->listener && server->listener->Close)
      server->listener->Close(server->listener);
  }
 
  if (server->screen)
  {
    shadow_screen_free(server->screen);
    server->screen = NULL;
  }
 
  if (server->capture)
  {
    shadow_capture_free(server->capture);
    server->capture = NULL;
  }
 
  return 0;
}
 
static int shadow_server_init_config_path(rdpShadowServer* server)
{
  if (!server->ConfigPath)
  {
    char* configHome = freerdp_settings_get_config_path();
 
    if (configHome)
    {
      if (!winpr_PathFileExists(configHome) && !winpr_PathMakePath(configHome, 0))
      {
        WLog_ERR(TAG, "Failed to create directory '%s'", configHome);
        free(configHome);
        return -1;
      }
 
      server->ConfigPath = configHome;
    }
  }
 
  if (!server->ConfigPath)
    return -1; /* no usable config path */
 
  return 1;
}
 
static BOOL shadow_server_create_certificate(rdpShadowServer* server, const char* filepath)
{
  BOOL rc = FALSE;
  char* makecert_argv[6] = { "makecert", "-rdp", "-live", "-silent", "-y", "5" };
 
  WINPR_STATIC_ASSERT(ARRAYSIZE(makecert_argv) <= INT_MAX);
  const size_t makecert_argc = ARRAYSIZE(makecert_argv);
 
  MAKECERT_CONTEXT* makecert = makecert_context_new();
 
  if (!makecert)
    goto out_fail;
 
  if (makecert_context_process(makecert, (int)makecert_argc, makecert_argv) < 0)
    goto out_fail;
 
  if (makecert_context_set_output_file_name(makecert, "shadow") != 1)
    goto out_fail;
 
  WINPR_ASSERT(server);
  WINPR_ASSERT(filepath);
  if (!winpr_PathFileExists(server->CertificateFile))
  {
    if (makecert_context_output_certificate_file(makecert, filepath) != 1)
      goto out_fail;
  }
 
  if (!winpr_PathFileExists(server->PrivateKeyFile))
  {
    if (makecert_context_output_private_key_file(makecert, filepath) != 1)
      goto out_fail;
  }
  rc = TRUE;
out_fail:
  makecert_context_free(makecert);
  return rc;
}
static BOOL shadow_server_init_certificate(rdpShadowServer* server)
{
  char* filepath = NULL;
  BOOL ret = FALSE;
 
  WINPR_ASSERT(server);
 
  if (!winpr_PathFileExists(server->ConfigPath) && !winpr_PathMakePath(server->ConfigPath, 0))
  {
    WLog_ERR(TAG, "Failed to create directory '%s'", server->ConfigPath);
    return FALSE;
  }
 
  if (!(filepath = GetCombinedPath(server->ConfigPath, "shadow")))
    return FALSE;
 
  if (!winpr_PathFileExists(filepath) && !winpr_PathMakePath(filepath, 0))
  {
    if (!CreateDirectoryA(filepath, 0))
    {
      WLog_ERR(TAG, "Failed to create directory '%s'", filepath);
      goto out_fail;
    }
  }
 
  server->CertificateFile = GetCombinedPath(filepath, "shadow.crt");
  server->PrivateKeyFile = GetCombinedPath(filepath, "shadow.key");
 
  if (!server->CertificateFile || !server->PrivateKeyFile)
    goto out_fail;
 
  if ((!winpr_PathFileExists(server->CertificateFile)) ||
      (!winpr_PathFileExists(server->PrivateKeyFile)))
  {
    if (!shadow_server_create_certificate(server, filepath))
      goto out_fail;
  }
 
  rdpSettings* settings = server->settings;
  WINPR_ASSERT(settings);
 
  rdpPrivateKey* key = freerdp_key_new_from_file_enc(server->PrivateKeyFile, NULL);
  if (!key)
    goto out_fail;
  if (!freerdp_settings_set_pointer_len(settings, FreeRDP_RdpServerRsaKey, key, 1))
    goto out_fail;
 
  rdpCertificate* cert = freerdp_certificate_new_from_file(server->CertificateFile);
  if (!cert)
    goto out_fail;
 
  if (!freerdp_settings_set_pointer_len(settings, FreeRDP_RdpServerCertificate, cert, 1))
    goto out_fail;
 
  if (!freerdp_certificate_is_rdp_security_compatible(cert))
  {
    if (!freerdp_settings_set_bool(settings, FreeRDP_UseRdpSecurityLayer, FALSE))
      goto out_fail;
    if (!freerdp_settings_set_bool(settings, FreeRDP_RdpSecurity, FALSE))
      goto out_fail;
  }
  ret = TRUE;
out_fail:
  free(filepath);
  return ret;
}
 
static BOOL shadow_server_check_peer_restrictions(freerdp_listener* listener)
{
  WINPR_ASSERT(listener);
 
  rdpShadowServer* server = (rdpShadowServer*)listener->info;
  WINPR_ASSERT(server);
 
  if (server->maxClientsConnected > 0)
  {
    const size_t count = ArrayList_Count(server->clients);
    if (count >= server->maxClientsConnected)
    {
      WLog_WARN(TAG, "connection limit [%" PRIuz "] reached, discarding client",
                server->maxClientsConnected);
      return FALSE;
    }
  }
  return TRUE;
}
 
int shadow_server_init(rdpShadowServer* server)
{
  int status = 0;
  winpr_InitializeSSL(WINPR_SSL_INIT_DEFAULT);
  WTSRegisterWtsApiFunctionTable(FreeRDP_InitWtsApi());
 
  if (!(server->clients = ArrayList_New(TRUE)))
    goto fail;
 
  if (!(server->StopEvent = CreateEvent(NULL, TRUE, FALSE, NULL)))
    goto fail;
 
  if (!InitializeCriticalSectionAndSpinCount(&(server->lock), 4000))
    goto fail;
 
  status = shadow_server_init_config_path(server);
 
  if (status < 0)
    goto fail;
 
  if (!shadow_server_init_certificate(server))
    goto fail;
 
  server->listener = freerdp_listener_new();
 
  if (!server->listener)
    goto fail;
 
  server->listener->info = (void*)server;
  server->listener->CheckPeerAcceptRestrictions = shadow_server_check_peer_restrictions;
  server->listener->PeerAccepted = shadow_client_accepted;
  server->subsystem = shadow_subsystem_new();
 
  if (!server->subsystem)
    goto fail;
 
  status = shadow_subsystem_init(server->subsystem, server);
  if (status < 0)
    goto fail;
 
  return status;
 
fail:
  shadow_server_uninit(server);
  WLog_ERR(TAG, "Failed to initialize shadow server");
  return -1;
}
 
int shadow_server_uninit(rdpShadowServer* server)
{
  if (!server)
    return -1;
 
  shadow_server_stop(server);
  shadow_subsystem_uninit(server->subsystem);
  shadow_subsystem_free(server->subsystem);
  server->subsystem = NULL;
  freerdp_listener_free(server->listener);
  server->listener = NULL;
  free(server->CertificateFile);
  server->CertificateFile = NULL;
  free(server->PrivateKeyFile);
  server->PrivateKeyFile = NULL;
  free(server->ConfigPath);
  server->ConfigPath = NULL;
  DeleteCriticalSection(&(server->lock));
  (void)CloseHandle(server->StopEvent);
  server->StopEvent = NULL;
  ArrayList_Free(server->clients);
  server->clients = NULL;
  return 1;
}
 
rdpShadowServer* shadow_server_new(void)
{
  rdpShadowServer* server = NULL;
  server = (rdpShadowServer*)calloc(1, sizeof(rdpShadowServer));
 
  if (!server)
    return NULL;
 
  server->SupportMultiRectBitmapUpdates = TRUE;
  server->port = 3389;
  server->mayView = TRUE;
  server->mayInteract = TRUE;
  server->h264RateControlMode = H264_RATECONTROL_VBR;
  server->h264BitRate = 10000000;
  server->h264FrameRate = 30;
  server->h264QP = 0;
  server->authentication = TRUE;
  server->settings = freerdp_settings_new(FREERDP_SETTINGS_SERVER_MODE);
  return server;
}
 
void shadow_server_free(rdpShadowServer* server)
{
  if (!server)
    return;
 
  free(server->ipcSocket);
  server->ipcSocket = NULL;
  freerdp_settings_free(server->settings);
  server->settings = NULL;
  free(server);
}