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[carveJwlIkooP6JGAAIwe30JlM.git] / gameserver.c

/*
 * Copyright (C) 2021-2023 Mt.ZERO Software, Harry Godden - All Rights Reserved
 */

#define _DEFAULT_SOURCE
#include <signal.h>
#include <unistd.h>
#include <time.h>
#include <string.h>

volatile sig_atomic_t sig_stop;

#include "gameserver.h" 
#include "vg/vg_opt.h"
#include "network_common.h"
#include "gameserver_db.h"
#include "vg/vg_m.h"
#include "vg/vg_msg.h"

static u64 const k_steamid_max = 0xffffffffffffffff;

static void inthandler( int signum ) {
   sig_stop = 1;
}

static void release_message( SteamNetworkingMessage_t *msg )
{
   msg->m_nUserData --;

   if( msg->m_nUserData == 0 )
      SteamAPI_SteamNetworkingMessage_t_Release( msg );
}

/*
 * Send message to single client, with authentication checking
 */
static void gameserver_send_to_client( i32 client_id,
                                       const void *pData, u32 cbData,
                                       int nSendFlags )
{
   struct gameserver_client *client = &gameserver.clients[ client_id ];

   if( gameserver.loopback_test && !client->connection ) 
      return;

   if( !client->steamid )
      return;

   SteamAPI_ISteamNetworkingSockets_SendMessageToConnection(
         hSteamNetworkingSockets, client->connection,
         pData, cbData, nSendFlags, NULL );
}

/*
 * Send message to all clients if they are authenticated
 */
static void gameserver_send_to_all( int ignore, 
                                    const void *pData, u32 cbData, 
                                    int nSendFlags )
{
   for( int i=0; i<vg_list_size(gameserver.clients); i++ )
   {
      struct gameserver_client *client = &gameserver.clients[i];

      if( i != ignore )
         gameserver_send_to_client( i, pData, cbData, nSendFlags );
   }
}

static void gameserver_send_version_to_client( int index )
{
   struct gameserver_client *client = &gameserver.clients[index];

   if( gameserver.loopback_test && !client->connection ) 
      return;

   netmsg_version version;
   version.inetmsg_id = k_inetmsg_version;
   version.version = NETWORK_SKATERIFT_VERSION;
   SteamAPI_ISteamNetworkingSockets_SendMessageToConnection(
         hSteamNetworkingSockets, client->connection,
         &version, sizeof(netmsg_version), 
         k_nSteamNetworkingSend_Reliable, NULL );
}

/*
 * handle server update that client #'index' has joined
 */
static void gameserver_player_join( int index )
{
   struct gameserver_client *joiner = &gameserver.clients[index];
   
   netmsg_playerjoin join = { .inetmsg_id = k_inetmsg_playerjoin,
                              .index = index,
                              .steamid = joiner->steamid };

   gameserver_send_to_all( index, &join, sizeof(join),
                           k_nSteamNetworkingSend_Reliable );

   /* 
    * update the joining user about current connections and our version
    */
   gameserver_send_version_to_client( index );

   netmsg_playerusername *username = 
      alloca( sizeof(netmsg_playerusername) + NETWORK_USERNAME_MAX );
   username->inetmsg_id = k_inetmsg_playerusername;

   netmsg_playeritem *item = 
      alloca( sizeof(netmsg_playeritem) + ADDON_UID_MAX );
   item->inetmsg_id = k_inetmsg_playeritem;

   netmsg_region *region = alloca( sizeof(netmsg_region) + NETWORK_REGION_MAX );
   region->inetmsg_id = k_inetmsg_region;

   for( int i=0; i<vg_list_size(gameserver.clients); i++ )
   {
      struct gameserver_client *client = &gameserver.clients[i];

      if( (i == index) || !client->steamid )
         continue;

      /* join */
      netmsg_playerjoin init = { .inetmsg_id = k_inetmsg_playerjoin,
                                 .index = i,
                                 .steamid = client->steamid };
      gameserver_send_to_client( index, &init, sizeof(init),
                                 k_nSteamNetworkingSend_Reliable );

      /* username */
      username->index = i;
      u32 chs = vg_strncpy( client->username, username->name, 
                            NETWORK_USERNAME_MAX,
                            k_strncpy_always_add_null );
      u32 size = sizeof(netmsg_playerusername) + chs + 1;
      gameserver_send_to_client( index, username, size,
                                 k_nSteamNetworkingSend_Reliable );

      /* items */
      for( int j=0; j<k_netmsg_playeritem_max; j++ )
      {
         chs = vg_strncpy( client->items[j].uid, item->uid, ADDON_UID_MAX, 
                           k_strncpy_always_add_null );
         item->type_index = j;
         item->client = i;
         size = sizeof(netmsg_playeritem) + chs + 1;
         gameserver_send_to_client( index, item, size,
                                    k_nSteamNetworkingSend_Reliable );
      }

      /* region */
      
      region->client = i;
      region->flags = client->region_flags;
      u32 l = vg_strncpy( client->region, region->loc, NETWORK_REGION_MAX, 
                          k_strncpy_always_add_null );
      size = sizeof(netmsg_region) + l + 1;

      gameserver_send_to_client( index, region, size,
                                 k_nSteamNetworkingSend_Reliable );
   }
}

/*
 * Handle server update that player has left
 */
static void gameserver_player_leave( int index ){
   if( gameserver.auth_mode == eServerModeAuthentication ){
      if( !gameserver.clients[ index ].steamid )
         return;
   }

   netmsg_playerleave leave;
   leave.inetmsg_id = k_inetmsg_playerleave;
   leave.index = index;

   vg_info( "Player leave (%d)\n", index );
   gameserver_send_to_all( index, &leave, sizeof(leave),
                           k_nSteamNetworkingSend_Reliable );
}

static void gameserver_update_all_knowledge( int client, int clear );

/*
 * Deletes client at index and disconnects the connection handle if it was 
 * set.
 */
static void remove_client( int index ){
   struct gameserver_client *client = &gameserver.clients[index];
   if( client->connection ){
      SteamAPI_ISteamNetworkingSockets_SetConnectionUserData(
            hSteamNetworkingSockets, client->connection, -1 );
      SteamAPI_ISteamNetworkingSockets_CloseConnection( 
            hSteamNetworkingSockets, client->connection,
            k_ESteamNetConnectionEnd_Misc_InternalError,
            NULL, 1 );
   }
   memset( client, 0, sizeof(struct gameserver_client) );
   gameserver_update_all_knowledge( index, 1 );
}

/*
 * Handle incoming new connection and init flags on the steam handle. if the 
 * server is full the userdata (client_id) will be set to -1 on the handle.
 */
static void handle_new_connection( HSteamNetConnection conn )
{
   SteamAPI_ISteamNetworkingSockets_SetConnectionUserData(
         hSteamNetworkingSockets, conn, -1 );

   int index = -1;

   for( int i=0; i<vg_list_size(gameserver.clients); i++ ){
      if( !gameserver.clients[i].active ){
         index = i;
         break;
      }
   }

   if( index == -1 ){
      vg_error( "Server full\n" );
      SteamAPI_ISteamNetworkingSockets_CloseConnection( 
            hSteamNetworkingSockets, conn, 
            4500,
            NULL, 1 );
      return;
   }

   struct gameserver_client *client = &gameserver.clients[index];
   EResult accept_status = SteamAPI_ISteamNetworkingSockets_AcceptConnection(
            hSteamNetworkingSockets, conn );

   if( accept_status == k_EResultOK )
   {
      vg_success( "Accepted client (id: %u, index: %d)\n", conn, index );

      client->active = 1;
      client->connection = conn;

      SteamAPI_ISteamNetworkingSockets_SetConnectionPollGroup(
            hSteamNetworkingSockets, conn, gameserver.client_group );
      
      SteamAPI_ISteamNetworkingSockets_SetConnectionUserData(
            hSteamNetworkingSockets, conn, index );

      if( gameserver.loopback_test )
      {
         vg_warn( "[DEV] Creating loopback client\n" );
         struct gameserver_client *loopback = &gameserver.clients[1];
         loopback->active = 1;
         loopback->connection = 0;
      }
   }
   else
   {
      vg_warn( "Error accepting connection (id: %u)\n", conn );
      SteamAPI_ISteamNetworkingSockets_CloseConnection( 
            hSteamNetworkingSockets, conn, 
            k_ESteamNetConnectionEnd_Misc_InternalError,
            NULL, 1 );
   }
}

static void on_auth_status( CallbackMsg_t *msg ){
   SteamNetAuthenticationStatus_t *info = (void *)msg->m_pubParam;
   vg_info( "  Authentication availibility: %s\n", 
         string_ESteamNetworkingAvailability(info->m_eAvail) );
   vg_info( "  %s\n", info->m_debugMsg );
}

/*
 * Get client id of connection handle. Will be -1 if unkown to us either because
 * the server is full or we already disconnected them
 */
static i32 gameserver_conid( HSteamNetConnection hconn )
{
   i64 id;

   if( hconn == 0 )
   {
      if( gameserver.loopback_test )
         return 1;
      else
         return -1;
   }
   else
      id = SteamAPI_ISteamNetworkingSockets_GetConnectionUserData(
               hSteamNetworkingSockets, hconn );

   if( (id < 0) || (id >= NETWORK_MAX_PLAYERS) )
      return -1;

   return id;
}

/*
 * Callback for steam connection state change
 */
static void on_connect_status( CallbackMsg_t *msg )
{
   SteamNetConnectionStatusChangedCallback_t *info = (void *)msg->m_pubParam;
   vg_info( "  Connection status changed for %lu\n", info->m_hConn );

   vg_info( "  %s -> %s\n", 
         string_ESteamNetworkingConnectionState(info->m_eOldState),
         string_ESteamNetworkingConnectionState(info->m_info.m_eState) );

   if( info->m_info.m_eState==k_ESteamNetworkingConnectionState_Connecting )
   {
      handle_new_connection( info->m_hConn );
   }

   if( (info->m_info.m_eState == 
            k_ESteamNetworkingConnectionState_ClosedByPeer ) ||
       (info->m_info.m_eState == 
        k_ESteamNetworkingConnectionState_ProblemDetectedLocally ) ||
       (info->m_info.m_eState == 
        k_ESteamNetworkingConnectionState_Dead) ||
       (info->m_info.m_eState ==
        k_ESteamNetworkingConnectionState_None) )
   {
      vg_info( "End reason: %d\n", info->m_info.m_eEndReason );

      int client_id = gameserver_conid( info->m_hConn );
      if( client_id != -1 )
      {
         gameserver_player_leave( client_id );
         remove_client( client_id );

         if( gameserver.loopback_test )
         {
            gameserver_player_leave( 1 );
            remove_client( 1 );
         }
      }
      else 
      {
         SteamAPI_ISteamNetworkingSockets_CloseConnection( 
               hSteamNetworkingSockets, info->m_hConn, 0, NULL, 0 );
      }
   }
}

static void gameserver_rx_version( SteamNetworkingMessage_t *msg )
{
   netmsg_version *version = msg->m_pData;

   int client_id = gameserver_conid( msg->m_conn );
   if( client_id == -1 ) 
   {
      vg_warn( "Recieved version from unkown connection (%u)\n", msg->m_conn );
      SteamAPI_ISteamNetworkingSockets_CloseConnection( 
            hSteamNetworkingSockets, msg->m_conn,
            k_ESteamNetConnectionEnd_Misc_InternalError,
            NULL, 1 );
      return;
   }

   struct gameserver_client *client = &gameserver.clients[ client_id ];

   if( client->version )
   {
      vg_warn( "Already have version for this client (%d conn: %u)", 
               client_id, msg->m_conn );
      return;
   }

   client->version = version->version;

   if( client->version != NETWORK_SKATERIFT_VERSION )
   {
      gameserver_send_version_to_client( client_id );
      remove_client( client_id );
      return;
   }

   /* this is the sign on point for non-auth servers,
    * for auth servers it comes at the end of rx_auth 
    */
   if( gameserver.auth_mode != eServerModeAuthentication )
   {
      client->steamid = k_steamid_max;
      gameserver_player_join( client_id );

      if( gameserver.loopback_test )
      {
         struct gameserver_client *loopback = &gameserver.clients[1];
         loopback->steamid = k_steamid_max;
         gameserver_player_join( 1 );
      }
   }
}

/* 
 * recieve auth ticket from connection. will only accept it if we've added them
 * to the client list first.
 */
static void gameserver_rx_auth( SteamNetworkingMessage_t *msg ){
   if( gameserver.auth_mode != eServerModeAuthentication ){
      vg_warn( "Running server without authentication. "
               "Connection %u tried to authenticate.\n", msg->m_conn );
      return;
   }

   int client_id = gameserver_conid( msg->m_conn );
   if( client_id == -1 ) {
      vg_warn( "Recieved auth ticket from unkown connection (%u)\n", 
               msg->m_conn );
      SteamAPI_ISteamNetworkingSockets_CloseConnection( 
            hSteamNetworkingSockets, msg->m_conn,
            k_ESteamNetConnectionEnd_Misc_InternalError, NULL, 1 );
      return;
   }

   struct gameserver_client *client = &gameserver.clients[ client_id ];
   if( client->steamid ){
      vg_warn( "Already authorized this user but another app ticket was sent"
               " again (%d conn: %u)\n", client_id, msg->m_conn );
      return;
   }

   if( client->version == 0 ){
      vg_error( "Client has not sent their version yet (%u)\n", msg->m_conn );
      remove_client( client_id );
      return;
   }

   vg_low( "Attempting to verify user\n" );

   if( msg->m_cbSize < sizeof(netmsg_auth) ){
      vg_error( "Malformed auth ticket, too small (%u)\n", msg->m_conn );
      remove_client( client_id );
      return;
   }

   netmsg_auth *auth = msg->m_pData;

   if( msg->m_cbSize < sizeof(netmsg_auth)+auth->ticket_length ||
       auth->ticket_length > 1024 ){
      vg_error( "Malformed auth ticket, ticket_length incorrect (%u)\n",
                  auth->ticket_length );
      remove_client( client_id );
      return;
   }

   u8 decrypted[1024];
   u32 ticket_len = 1024;

   int success = SteamEncryptedAppTicket_BDecryptTicket(
         auth->ticket, auth->ticket_length, decrypted,
         &ticket_len, gameserver.app_symmetric_key,
         k_nSteamEncryptedAppTicketSymmetricKeyLen );

   if( !success ){
      vg_error( "Failed to decrypt users ticket (client %u)\n", msg->m_conn );
      vg_error( "  ticket length: %u\n", auth->ticket_length );
      remove_client( client_id );
      return;
   }

   if( SteamEncryptedAppTicket_GetTicketIssueTime( decrypted, ticket_len )){
      RTime32 ctime = time(NULL),
              tickettime = SteamEncryptedAppTicket_GetTicketIssueTime(
                    decrypted, ticket_len ),
              expiretime = tickettime + 24*3*60*60;
      
      if( ctime > expiretime ){
         vg_error( "Ticket expired (client %u)\n", msg->m_conn );
         remove_client( client_id );
         return;
      }
   }

   CSteamID steamid;
   SteamEncryptedAppTicket_GetTicketSteamID( decrypted, ticket_len, &steamid );
   vg_success( "User is authenticated! steamid %lu (%u)\n", 
         steamid.m_unAll64Bits, msg->m_conn );

   client->steamid = steamid.m_unAll64Bits;
   gameserver_player_join( client_id );
}

/*
 * Player updates sent to us
 * -----------------------------------------------------------------------------
 */

static int packet_minsize( SteamNetworkingMessage_t *msg, u32 size ){
   if( msg->m_cbSize < size ) {
      vg_error( "Invalid packet size (must be at least %u)\n", size );
      return 0;
   }
   else{
      return 1;
   }
}

struct db_set_username_thread_data {
   u64 steamid;
   char username[ NETWORK_USERNAME_MAX ];
};

static void gameserver_update_db_username( db_request *db_req ){
   struct db_set_username_thread_data *inf = (void *)db_req->data;

   if( inf->steamid == k_steamid_max )
      return;

   int admin = 0;
   if( inf->steamid == 76561198072130043 )
      admin = 2;

   db_updateuser( inf->steamid, inf->username, admin );
}

static int gameserver_item_eq( struct gameserver_item *ia, 
                               struct gameserver_item *ib ){
   if( ia->hash == ib->hash )
      if( !strcmp(ia->uid,ib->uid) )
         return 1;

   return 0;
}

/*
 * Match addons between two player IDs. if clear is set, then the flags between
 * those two IDs will all be set to 0.
 */
static void gameserver_update_knowledge_table( int client0, int client1, 
                                               int clear ){
   u32 idx = network_pair_index( client0, client1 );

   struct gameserver_client *c0 = &gameserver.clients[client0],
                            *c1 = &gameserver.clients[client1];

   u8 flags = 0x00;

   if( !clear ){
      if( gameserver_item_eq(&c0->items[k_netmsg_playeritem_world0],
                             &c1->items[k_netmsg_playeritem_world0]))
         flags |= CLIENT_KNOWLEDGE_SAME_WORLD0;

      if( gameserver_item_eq(&c0->items[k_netmsg_playeritem_world1],
                             &c1->items[k_netmsg_playeritem_world1]))
         flags |= CLIENT_KNOWLEDGE_SAME_WORLD1;
   }

   gameserver.client_knowledge_mask[idx] = flags;
}

/*
 * If a change has been made on this client, then it will adjust the entire
 * table of other players. if clear is set, all references to client will be set
 * to 0.
 */
static void gameserver_update_all_knowledge( int client, int clear ){
   for( int i=0; i<NETWORK_MAX_PLAYERS; i ++ ){
      if( i == client )
         continue;

      struct gameserver_client *ci = &gameserver.clients[i];

      if( ci->steamid )
         gameserver_update_knowledge_table( client, i, clear );
   }
}

static void gameserver_propogate_player_frame( int client_id, 
                                               netmsg_playerframe *frame, 
                                               u32 size ){
   u32 basic_size = sizeof(netmsg_playerframe) + ((24*3)/8);
   netmsg_playerframe *full = alloca(size),
                      *basic= alloca(basic_size);

   memcpy( full, frame, size );
   memcpy( basic, frame, basic_size );

   full->client = client_id;
   basic->client = client_id;
   basic->subsystem = 4; /* (.._basic_info: 24f*3 animator ) */
   basic->sound_effects = 0;

   struct gameserver_client *c0 = &gameserver.clients[client_id];
   c0->instance = frame->flags & NETMSG_PLAYERFRAME_INSTANCE_ID;

   for( int i=0; i<vg_list_size(gameserver.clients); i++ )
   {
      if( i == client_id )
         continue;

      struct gameserver_client *ci = &gameserver.clients[i];

      int send_full = 0;

      if( c0->instance == ci->instance )
      {
         u32 k_index = network_pair_index( client_id, i );
         u8 k_mask = gameserver.client_knowledge_mask[ k_index ];
         
         if( (k_mask & (CLIENT_KNOWLEDGE_SAME_WORLD0<<c0->instance)) )
            send_full = 1;
      }

      if( send_full )
      {
         gameserver_send_to_client( i, full, size, 
                                    k_nSteamNetworkingSend_Unreliable );
      }
      else 
      {
         gameserver_send_to_client( i, basic, basic_size, 
                                    k_nSteamNetworkingSend_Unreliable );
      }
   }
}

static void gameserver_rx_200_300( SteamNetworkingMessage_t *msg )
{
   netmsg_blank *tmp = msg->m_pData;

   int client_id = gameserver_conid( msg->m_conn );
   if( client_id == -1 ) return;

   struct gameserver_client *client = &gameserver.clients[ client_id ];

   if( tmp->inetmsg_id == k_inetmsg_playerusername )
   {
      if( !packet_minsize( msg, sizeof(netmsg_playerusername)+1 ))
         return;
      
      netmsg_playerusername *src = msg->m_pData;

      u32 name_len = network_msgstring( src->name, msg->m_cbSize, 
                                        sizeof(netmsg_playerusername),
                                        client->username, 
                                        NETWORK_USERNAME_MAX );

      /* update other users about this change */
      netmsg_playerusername *prop = alloca(sizeof(netmsg_playerusername)+
                                             NETWORK_USERNAME_MAX );
                                           
      prop->inetmsg_id = k_inetmsg_playerusername;
      prop->index = client_id;
      u32 chs = vg_strncpy( client->username, prop->name, NETWORK_USERNAME_MAX,
                            k_strncpy_always_add_null );

      vg_info( "client #%d changed name to: %s\n", client_id, prop->name );

      u32 propsize = sizeof(netmsg_playerusername) + chs + 1;
      gameserver_send_to_all( client_id, prop, propsize,
                              k_nSteamNetworkingSend_Reliable );

      /* update database about this */
      db_request *call = db_alloc_request( 
                           sizeof(struct db_set_username_thread_data) );
      struct db_set_username_thread_data *inf = (void *)call->data;
      inf->steamid = client->steamid;
      vg_strncpy( client->username, inf->username, 
                  sizeof(inf->username), k_strncpy_always_add_null );
      call->handler = gameserver_update_db_username;
      db_send_request( call );
   }
   else if( tmp->inetmsg_id == k_inetmsg_playerframe )
   {
      gameserver_propogate_player_frame( client_id, 
                                         msg->m_pData, msg->m_cbSize );
   }
   else if( tmp->inetmsg_id == k_inetmsg_playeritem )
   {
      netmsg_playeritem *item = msg->m_pData;

      /* record */
      if( item->type_index >= k_netmsg_playeritem_max )
      {
         vg_warn( "Client #%d invalid equip type %u\n", 
                  client_id, (u32)item->type_index );
         return;
      }
      
      char *dest = client->items[ item->type_index ].uid;

      network_msgstring( item->uid, msg->m_cbSize, sizeof(netmsg_playeritem),
                         dest, ADDON_UID_MAX );

      vg_info( "Client #%d equiped: [%s] %s\n", 
               client_id, 
               (const char *[]){[k_netmsg_playeritem_board]="board",
                                [k_netmsg_playeritem_player]="player",
                                [k_netmsg_playeritem_world0]="world0",
                                [k_netmsg_playeritem_world1]="world1"
               }[item->type_index], item->uid );

      gameserver_update_all_knowledge( client_id, 0 );
                           
      /* propogate */
      netmsg_playeritem *prop = alloca(msg->m_cbSize);
      memcpy( prop, msg->m_pData, msg->m_cbSize );
      prop->client = client_id;
      gameserver_send_to_all( client_id, prop, msg->m_cbSize, 
                              k_nSteamNetworkingSend_Reliable );
   }
   else if( tmp->inetmsg_id == k_inetmsg_chat )
   {
      netmsg_chat *chat = msg->m_pData,
                  *prop = alloca( sizeof(netmsg_chat) + NETWORK_MAX_CHAT );
      prop->inetmsg_id = k_inetmsg_chat;
      prop->client = client_id;

      u32 l = network_msgstring( chat->msg, msg->m_cbSize, sizeof(netmsg_chat),
                                 prop->msg, NETWORK_MAX_CHAT );
      vg_info( "[%d]: %s\n", client_id, prop->msg );

      gameserver_send_to_all( client_id, prop, sizeof(netmsg_chat)+l+1, 
                              k_nSteamNetworkingSend_Reliable );
   }
   else if( tmp->inetmsg_id == k_inetmsg_region )
   {
      netmsg_region *region = msg->m_pData,
                    *prop = alloca( sizeof(netmsg_region) + NETWORK_REGION_MAX );

      prop->inetmsg_id = k_inetmsg_region;
      prop->client = client_id;
      prop->flags = region->flags;

      u32 l = network_msgstring( 
            region->loc, msg->m_cbSize, sizeof(netmsg_region),
            client->region, NETWORK_REGION_MAX );
      client->region_flags = region->flags;

      l = vg_strncpy( client->region, prop->loc, NETWORK_REGION_MAX, 
                      k_strncpy_always_add_null );

      gameserver_send_to_all( client_id, prop, sizeof(netmsg_region)+l+1, 
                              k_nSteamNetworkingSend_Reliable );
      vg_info( "client %d moved to region: %s\n", client_id, client->region );
   }
   else 
   {
      vg_warn( "Unknown inetmsg_id recieved from client. (%u)\n",
               tmp->inetmsg_id );
   }
}

static void gameserver_request_respond( enum request_status status,
                                        netmsg_request *res, vg_msg *body,
                                        SteamNetworkingMessage_t *msg ){
   int client_id = gameserver_conid( msg->m_conn );
   u32 len = 0;
   if( body ){
      len = body->cur.co;
      vg_low( "[%d#%d] Response: %d\n", client_id, (i32)res->id, status );
      vg_msg_print( body, len );
   }

   res->status = status;

   if( gameserver.loopback_test && !msg->m_conn )
   {
      release_message( msg );
      return;
   }

   SteamAPI_ISteamNetworkingSockets_SendMessageToConnection(
         hSteamNetworkingSockets, msg->m_conn,
         res, sizeof(netmsg_request) + len,
         k_nSteamNetworkingSend_Reliable, NULL );

   release_message( msg );
}

struct user_request_thread_data {
   SteamNetworkingMessage_t *msg;
};

static u32 gameserver_get_current_week(void){
   return time(NULL) / (7*24*60*60);
}

static enum request_status gameserver_cat_table( 
      vg_msg *msg, 
      const char *mod, const char *route, u32 week, const char *alias )
{
   char table_name[ DB_TABLE_UID_MAX ];
   if( !db_get_highscore_table_name( mod, route, week, table_name ) )
      return k_request_status_out_of_memory;

   char buf[512];
   vg_str q;
   vg_strnull( &q, buf, 512 );
   vg_strcat( &q, "SELECT * FROM \"" );
   vg_strcat( &q, table_name );
   vg_strcat( &q, "\" ORDER BY time ASC LIMIT 10;" );
   if( !vg_strgood(&q) )
      return k_request_status_out_of_memory;

   sqlite3_stmt *stmt = db_stmt( q.buffer );
   if( !stmt )
      return k_request_status_database_error;

   vg_msg_frame( msg, alias );
   for( u32 i=0; i<10; i ++ ){
      int fc = sqlite3_step( stmt );

      if( fc == SQLITE_ROW ){
         i32 time = sqlite3_column_int( stmt, 1 );
         i64 steamid_i64 = sqlite3_column_int64( stmt, 0 );
         u64 steamid = *((u64 *)&steamid_i64);

         if( steamid == k_steamid_max )
            continue;

         vg_msg_frame( msg, "" );
         vg_msg_wkvnum( msg, "time", k_vg_msg_u32, 1, &time );
         vg_msg_wkvnum( msg, "steamid", k_vg_msg_u64, 1, &steamid );

         char username[32];
         if( db_getuserinfo( steamid, username, sizeof(username), NULL ) )
            vg_msg_wkvstr( msg, "username", username );
         vg_msg_end_frame( msg );
      }
      else if( fc == SQLITE_DONE ){
         break;
      }
      else {
         log_sqlite3( fc );
         break;
      }
   }

   sqlite3_finalize( stmt );
   vg_msg_end_frame( msg );
   return k_request_status_ok;
}

static void gameserver_process_user_request( db_request *db_req )
{
   struct user_request_thread_data *inf = (void *)db_req->data;
   SteamNetworkingMessage_t *msg = inf->msg;

   int client_id = gameserver_conid( msg->m_conn );
   if( client_id == -1 )
   {
      release_message( msg );
      return;
   }

   struct gameserver_client *client = &gameserver.clients[ client_id ];

   netmsg_request *req = (netmsg_request *)msg->m_pData;
   vg_msg data;
   vg_msg_init( &data, req->q, msg->m_cbSize - sizeof(netmsg_request) );

   /* create response packet */
   netmsg_request *res = alloca( sizeof(netmsg_request) + NETWORK_REQUEST_MAX );
   res->inetmsg_id = k_inetmsg_response;
   res->id = req->id;
   vg_msg body;
   vg_msg_init( &body, res->q, NETWORK_REQUEST_MAX );

   const char *endpoint = vg_msg_getkvstr( &data, "endpoint" );

   if( !endpoint ){
      gameserver_request_respond( k_request_status_invalid_endpoint,
                                  res, NULL, msg );
      return;
   }

   if( !strcmp( endpoint, "scoreboard" ) ){
      const char *mod = vg_msg_getkvstr( &data, "mod" );
      const char *route = vg_msg_getkvstr( &data, "route" );
      u32 week;
      vg_msg_getkvintg( &data, "week", k_vg_msg_u32, &week, NULL );
      
      if( week == NETWORK_LEADERBOARD_CURRENT_WEEK ){
         gameserver_cat_table( &body, mod, route, 
                               gameserver_get_current_week(), "rows_weekly" );
      }
      else if( week == NETWORK_LEADERBOARD_ALLTIME_AND_CURRENT_WEEK ){
         gameserver_cat_table( &body, mod, route, 0, "rows" );
         gameserver_cat_table( &body, mod, route, 
                               gameserver_get_current_week(), "rows_weekly" );
      }
      else 
         gameserver_cat_table( &body, mod, route, week, "rows" );

      if( body.error != k_vg_msg_error_OK ){
         gameserver_request_respond( k_request_status_out_of_memory,
                                     res, NULL, msg );
         return;
      }

      gameserver_request_respond( k_request_status_ok, res, &body, msg );
   }
   else if( !strcmp( endpoint, "setlap" ) ){
      if( client->steamid == k_steamid_max ){
         gameserver_request_respond( k_request_status_unauthorized,
                                     res, NULL, msg );
         return;
      }

      const char *mod = vg_msg_getkvstr( &data, "mod" );
      const char *route = vg_msg_getkvstr( &data, "route" );
      
      char weekly_table[ DB_TABLE_UID_MAX ],
           alltime_table[ DB_TABLE_UID_MAX ];

      u32 week = gameserver_get_current_week();

      if( !db_get_highscore_table_name( mod, route, 0, alltime_table ) ||
          !db_get_highscore_table_name( mod, route, week, weekly_table ) ){
         gameserver_request_respond( k_request_status_out_of_memory,
                                     res, NULL, msg );
         return;
      }

      i32 centiseconds;
      vg_msg_getkvintg( &data, "time", k_vg_msg_i32, &centiseconds, NULL );
      if( centiseconds < 5*100 ){
         gameserver_request_respond( k_request_status_client_error,
                                     res, NULL, msg );
         return;
      }

      db_writeusertime( alltime_table, client->steamid, centiseconds, 1 );
      db_writeusertime( weekly_table, client->steamid, centiseconds, 1 );
      gameserver_request_respond( k_request_status_ok, res, NULL, msg );
   }
   else{
      gameserver_request_respond( k_request_status_invalid_endpoint,
                                  res, NULL, msg );
   }
}

static void gameserver_rx_300_400( SteamNetworkingMessage_t *msg )
{
   netmsg_blank *tmp = msg->m_pData;

   int client_id = gameserver_conid( msg->m_conn );
   if( client_id == -1 )
   {
      release_message( msg );
      return;
   }

   if( tmp->inetmsg_id == k_inetmsg_request )
   {
      if( gameserver.loopback_test && (client_id == 1) )
      {
         release_message( msg );
         return;
      }

      if( !packet_minsize( msg, sizeof(netmsg_request)+1 ))
      {
         release_message( msg );
         return;
      }

      db_request *call = db_alloc_request( 
                           sizeof(struct user_request_thread_data) );
      struct user_request_thread_data *inf = (void *)call->data;
      inf->msg = msg;
      call->handler = gameserver_process_user_request;
      db_send_request( call );
   }
   else 
   {
      vg_warn( "Unknown inetmsg_id recieved from client. (%u)\n",
               tmp->inetmsg_id );
      release_message( msg );
   }
}

static void process_network_message( SteamNetworkingMessage_t *msg )
{
   if( msg->m_cbSize < sizeof(netmsg_blank) ){
      vg_warn( "Discarding message (too small: %d)\n", 
            msg->m_cbSize );
      return;
   }

   netmsg_blank *tmp = msg->m_pData;

   if( (tmp->inetmsg_id >= 200) && (tmp->inetmsg_id < 300) )
   {
      gameserver_rx_200_300( msg );
      release_message( msg );
   }
   else if( (tmp->inetmsg_id >= 300) && (tmp->inetmsg_id < 400) )
   {
      gameserver_rx_300_400( msg );
   }
   else{
      if( tmp->inetmsg_id == k_inetmsg_auth )
         gameserver_rx_auth( msg );
      else if( tmp->inetmsg_id == k_inetmsg_version ){
         gameserver_rx_version( msg );
      }
      else {
         vg_warn( "Unknown inetmsg_id recieved from client. (%u)\n",
                  tmp->inetmsg_id );
      }
      release_message( msg );
   }
}

static void poll_connections(void)
{
   SteamNetworkingMessage_t *messages[32];
   int len;

   while(1)
   {
      len = SteamAPI_ISteamNetworkingSockets_ReceiveMessagesOnPollGroup(
            hSteamNetworkingSockets,
            gameserver.client_group, messages, vg_list_size(messages) );

      if( len <= 0 )
         return;

      for( int i=0; i<len; i++ )
      {
         SteamNetworkingMessage_t *msg = messages[i];
         msg->m_nUserData = 1;

         if( gameserver.loopback_test )
         {
            HSteamNetConnection conid = msg->m_conn;
            msg->m_conn = 0;
            msg->m_nUserData ++;
            process_network_message( msg );
            msg->m_conn = conid;
         }

         process_network_message( msg );
      }
   }
}

static u64 seconds_to_server_ticks( double s ){
   return s / 0.01;
}

int main( int argc, char *argv[] ){
   signal( SIGINT, inthandler );
   signal( SIGQUIT, inthandler );
   signal( SIGPIPE, SIG_IGN );

   char *arg;
   while( vg_argp( argc, argv ) )
   {
      if( vg_long_opt( "noauth" ) )
         gameserver.auth_mode = eServerModeNoAuthentication;

      if( vg_long_opt( "loopback" ) )
         gameserver.loopback_test = 1;
   }
   
   vg_set_mem_quota( 80*1024*1024 );
   vg_alloc_quota();
   db_init();

   /* steamworks init 
    * --------------------------------------------------------------- */
   steamworks_ensure_txt( "2103940" );
   if( gameserver.auth_mode == eServerModeAuthentication ){
      if( !vg_load_steam_symetric_key( "application_key", 
                                       gameserver.app_symmetric_key )){
         return 0;
      }
   }
   else{
      vg_warn( "Running without user authentication.\n" );
   }

   if( !SteamGameServer_Init( 0, NETWORK_PORT, NETWORK_PORT+1, 
                              gameserver.auth_mode, "1.0.0.0" ) ){
      vg_error( "SteamGameServer_Init failed\n" );
      return 0;
   }

   void *hSteamGameServer = SteamAPI_SteamGameServer();
   SteamAPI_ISteamGameServer_LogOnAnonymous( hSteamGameServer );

   SteamAPI_ManualDispatch_Init();
   HSteamPipe hsteampipe = SteamGameServer_GetHSteamPipe();
   hSteamNetworkingSockets = 
      SteamAPI_SteamGameServerNetworkingSockets_SteamAPI();

   steam_register_callback( k_iSteamNetAuthenticationStatus, on_auth_status );
   steam_register_callback( k_iSteamNetConnectionStatusChangedCallBack,
                             on_connect_status );

   vg_success( "Steamworks API running\n" );
   steamworks_event_loop( hsteampipe );

   /*
    * Create a listener
    */
   HSteamListenSocket listener;
   SteamNetworkingIPAddr localAddr;
   SteamAPI_SteamNetworkingIPAddr_Clear( &localAddr );
   localAddr.m_port = NETWORK_PORT;

   listener = SteamAPI_ISteamNetworkingSockets_CreateListenSocketIP(
                  hSteamNetworkingSockets, &localAddr, 0, NULL );
   gameserver.client_group = SteamAPI_ISteamNetworkingSockets_CreatePollGroup(
         hSteamNetworkingSockets );

   u64 server_ticks = 8000,
       last_record_save = 8000,
       last_scoreboard_gen = 0;

   while( !sig_stop ){
      steamworks_event_loop( hsteampipe );
      poll_connections();

      usleep(10000);
      server_ticks ++;

      if( db_killed() )
         break;
   }
   
   SteamAPI_ISteamNetworkingSockets_DestroyPollGroup( hSteamNetworkingSockets,
         gameserver.client_group );
   SteamAPI_ISteamNetworkingSockets_CloseListenSocket( 
         hSteamNetworkingSockets, listener );
   
   vg_info( "Shutting down\n..." );
   SteamGameServer_Shutdown();
   db_kill();
   db_free();

   return 0;
}