src/client/client.c

   1 #define _GNU_SOURCE // don't worry, GNU extensions are only used when available
   2 #include <dragonnet/init.h>
   3 #include <dragonstd/flag.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <pthread.h>
   8 #include <unistd.h>
   9 #include "client/client.h"
  10 #include "client/client_auth.h"
  11 #include "client/client_inventory.h"
  12 #include "client/client_node.h"
  13 #include "client/client_player.h"
  14 #include "client/client_terrain.h"
  15 #include "client/debug_menu.h"
  16 #include "client/game.h"
  17 #include "client/input.h"
  18 #include "common/day.h"
  19 #include "common/interrupt.h"
  20 #include "common/perlin.h"
  21 #include "types.h"
  22
  23 DragonnetPeer *client;
  24
  25 static Flag finish;
  26 static Flag gfx_init;
  27
  28 static bool on_recv(__attribute__((unused)) DragonnetPeer *peer, DragonnetTypeId type, __attribute__((unused)) void *pkt)
  29 {
  30         bool allowed = false;
  31         pthread_mutex_lock(&client_auth.mtx);
  32
  33         // this code exists to stop malicious or malfunctioning packets
  34         switch (client_auth.state) {
  35                 // the server shouldn't send anything during auth preparation, drop it
  36                 case AUTH_INIT:
  37                         allowed = false;
  38                         break;
  39
  40                 // only the auth packet is allowed before auth is finished
  41                 case AUTH_WAIT:
  42                         allowed = type == DRAGONNET_TYPE_ToClientAuth;
  43                         break;
  44
  45                 // don't process auth packets when auth is already finished
  46                 case AUTH_SUCCESS:
  47                         allowed = type != DRAGONNET_TYPE_ToClientAuth;
  48                         break;
  49         }
  50
  51         /*
  52                 It is important that the auth state does not change to until the packet is
  53                         processed.
  54
  55                 However, the only state change done by other threads is AUTH_INIT -> AUTH_WAIT,
  56                         which is not problematic since packets that are received during AUTH_INIT
  57                         are not processed, they are always dropped.
  58
  59                 Therefore the mutex can be unlocked at this point.
  60         */
  61         pthread_mutex_unlock(&client_auth.mtx);
  62         return allowed;
  63 }
  64
  65 static void on_disconnect(__attribute__((unused)) DragonnetPeer *peer)
  66 {
  67         flag_set(&interrupt);
  68         // don't free the connection before all other client components have shut down
  69         flag_slp(&finish);
  70 }
  71
  72 static void on_ToClientAuth(__attribute__((unused)) DragonnetPeer *peer, ToClientAuth *pkt)
  73 {
  74         pthread_mutex_lock(&client_auth.mtx);
  75         if (pkt->success) {
  76                 client_auth.state = AUTH_SUCCESS;
  77                 printf("[access] authenticated successfully\n");
  78         } else {
  79                 client_auth.state = AUTH_INIT;
  80                 printf("[access] authentication failed, please try again\n");
  81         }
  82         pthread_cond_signal(&client_auth.cv);
  83         pthread_mutex_unlock(&client_auth.mtx);
  84
  85         // yield the connection until the game is fully initialized
  86         if (pkt->success)
  87                 flag_slp(&gfx_init);
  88 }
  89
  90 static void on_ToClientInfo(__attribute__((unused)) DragonnetPeer *peer, ToClientInfo *pkt)
  91 {
  92         client_terrain_set_load_distance(pkt->load_distance);
  93         seed = pkt->seed;
  94 }
  95
  96 static void on_ToClientTimeOfDay(__attribute__((unused)) DragonnetPeer *peer, ToClientTimeOfDay *pkt)
  97 {
  98         set_time_of_day(pkt->time_of_day);
  99 }
 100
 101 static void on_ToClientMovement(__attribute__((unused)) DragonnetPeer *peer, ToClientMovement *pkt)
 102 {
 103         pthread_rwlock_wrlock(&client_player.lock_movement);
 104         client_player.movement = *pkt;
 105         pthread_rwlock_unlock(&client_player.lock_movement);
 106
 107         debug_menu_changed(ENTRY_FLIGHT);
 108         debug_menu_changed(ENTRY_COLLISION);
 109 }
 110
 111 int main(int argc, char **argv)
 112 {
 113 #ifdef __GLIBC__ // check whether bloat is enabled
 114         pthread_setname_np(pthread_self(), "main");
 115 #endif // __GLIBC__
 116
 117         if (argc < 2) {
 118                 fprintf(stderr, "[error] missing address\n");
 119                 return EXIT_FAILURE;
 120         }
 121
 122         dragonnet_init();
 123         if (!(client = dragonnet_connect(argv[1]))) {
 124                 fprintf(stderr, "[error] failed to connect to server\n");
 125                 return EXIT_FAILURE;
 126         }
 127
 128         printf("[access] connected to %s\n", client->address);
 129
 130         client->on_disconnect = &on_disconnect;
 131         client->on_recv                                                  = (void *) &on_recv;
 132         client->on_recv_type[DRAGONNET_TYPE_ToClientAuth               ] = (void *) &on_ToClientAuth;
 133         client->on_recv_type[DRAGONNET_TYPE_ToClientChunk              ] = (void *) &client_terrain_receive_chunk;
 134         client->on_recv_type[DRAGONNET_TYPE_ToClientInfo               ] = (void *) &on_ToClientInfo;
 135         client->on_recv_type[DRAGONNET_TYPE_ToClientTimeOfDay          ] = (void *) &on_ToClientTimeOfDay;
 136         client->on_recv_type[DRAGONNET_TYPE_ToClientMovement           ] = (void *) &on_ToClientMovement;
 137         client->on_recv_type[DRAGONNET_TYPE_ToClientEntityAdd          ] = (void *) &client_entity_add;
 138         client->on_recv_type[DRAGONNET_TYPE_ToClientEntityRemove       ] = (void *) &client_entity_remove;
 139         client->on_recv_type[DRAGONNET_TYPE_ToClientEntityUpdatePosRot ] = (void *) &client_entity_update_pos_rot;
 140         client->on_recv_type[DRAGONNET_TYPE_ToClientEntityUpdateNametag] = (void *) &client_entity_update_nametag;
 141         client->on_recv_type[DRAGONNET_TYPE_ToClientPlayerInventory    ] = (void *) &client_inventory_update_player;
 142
 143         flag_ini(&finish);
 144         flag_ini(&gfx_init);
 145
 146         interrupt_init();
 147         client_terrain_init();
 148         client_player_init();
 149         client_entity_init();
 150         dragonnet_peer_run(client);
 151         client_auth_init();
 152
 153         game(&gfx_init);
 154
 155         dragonnet_peer_shutdown(client);
 156         client_auth_deinit();
 157         client_entity_deinit();
 158         client_player_deinit();
 159         client_terrain_deinit();
 160         interrupt_deinit();
 161
 162         pthread_t recv_thread = client->recv_thread;
 163
 164         flag_set(&finish);
 165         pthread_join(recv_thread, NULL);
 166
 167         flag_dst(&finish);
 168         flag_dst(&gfx_init);
 169
 170         dragonnet_deinit();
 171         return EXIT_SUCCESS;
 172 }