src/client/client.c

   1 #define _GNU_SOURCE // don't worry, GNU extensions are only used when available
   2 #include <dragonstd/flag.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <pthread.h>
   7 #include <unistd.h>
   8 #include "client/client.h"
   9 #include "client/client_auth.h"
  10 #include "client/client_inventory.h"
  11 #include "client/client_player.h"
  12 #include "client/client_terrain.h"
  13 #include "client/debug_menu.h"
  14 #include "client/game.h"
  15 #include "client/input.h"
  16 #include "day.h"
  17 #include "interrupt.h"
  18 #include "perlin.h"
  19 #include "types.h"
  20
  21 DragonnetPeer *client;
  22
  23 static Flag finish;
  24 static Flag gfx_init;
  25
  26 static bool on_recv(__attribute__((unused)) DragonnetPeer *peer, DragonnetTypeId type, __attribute__((unused)) void *pkt)
  27 {
  28         bool allowed = false;
  29         pthread_mutex_lock(&client_auth.mtx);
  30
  31         // this code exists to stop malicious or malfunctioning packets
  32         switch (client_auth.state) {
  33                 // the server shouldn't send anything during auth preparation, drop it
  34                 case AUTH_INIT:
  35                         allowed = false;
  36                         break;
  37
  38                 // only the auth packet is allowed before auth is finished
  39                 case AUTH_WAIT:
  40                         allowed = type == DRAGONNET_TYPE_ToClientAuth;
  41                         break;
  42
  43                 // don't process auth packets when auth is already finished
  44                 case AUTH_SUCCESS:
  45                         allowed = type != DRAGONNET_TYPE_ToClientAuth;
  46                         break;
  47         }
  48
  49         /*
  50                 It is important that the auth state does not change to until the packet is
  51                         processed.
  52
  53                 However, the only state change done by other threads is AUTH_INIT -> AUTH_WAIT,
  54                         which is not problematic since packets that are received during AUTH_INIT
  55                         are not processed, they are always dropped.
  56
  57                 Therefore the mutex can be unlocked at this point.
  58         */
  59         pthread_mutex_unlock(&client_auth.mtx);
  60         return allowed;
  61 }
  62
  63 static void on_disconnect(__attribute__((unused)) DragonnetPeer *peer)
  64 {
  65         flag_set(&interrupt);
  66         // don't free the connection before all other client components have shut down
  67         flag_slp(&finish);
  68 }
  69
  70 static void on_ToClientAuth(__attribute__((unused)) DragonnetPeer *peer, ToClientAuth *pkt)
  71 {
  72         pthread_mutex_lock(&client_auth.mtx);
  73         if (pkt->success) {
  74                 client_auth.state = AUTH_SUCCESS;
  75                 printf("[access] authenticated successfully\n");
  76         } else {
  77                 client_auth.state = AUTH_INIT;
  78                 printf("[access] authentication failed, please try again\n");
  79         }
  80         pthread_cond_signal(&client_auth.cv);
  81         pthread_mutex_unlock(&client_auth.mtx);
  82
  83         // yield the connection until the game is fully initialized
  84         if (pkt->success)
  85                 flag_slp(&gfx_init);
  86 }
  87
  88 static void on_ToClientChunk(__attribute__((unused)) DragonnetPeer *peer, ToClientChunk *pkt)
  89 {
  90         TerrainChunk *chunk = terrain_get_chunk(client_terrain, pkt->pos, true);
  91
  92         terrain_deserialize_chunk(chunk, pkt->data);
  93         ((TerrainChunkMeta *) chunk->extra)->empty = (pkt->data.siz == 0);
  94         client_terrain_chunk_received(chunk);
  95 }
  96
  97 static void on_ToClientInfo(__attribute__((unused)) DragonnetPeer *peer, ToClientInfo *pkt)
  98 {
  99         client_terrain_set_load_distance(pkt->load_distance);
 100         seed = pkt->seed;
 101 }
 102
 103 static void on_ToClientTimeOfDay(__attribute__((unused)) DragonnetPeer *peer, ToClientTimeOfDay *pkt)
 104 {
 105         set_time_of_day(pkt->time_of_day);
 106 }
 107
 108 static void on_ToClientMovement(__attribute__((unused)) DragonnetPeer *peer, ToClientMovement *pkt)
 109 {
 110         pthread_rwlock_wrlock(&client_player.lock_movement);
 111         client_player.movement = *pkt;
 112         pthread_rwlock_unlock(&client_player.lock_movement);
 113
 114         debug_menu_changed(ENTRY_FLIGHT);
 115         debug_menu_changed(ENTRY_COLLISION);
 116 }
 117
 118 int main(int argc, char **argv)
 119 {
 120 #ifdef __GLIBC__ // check whether bloat is enabled
 121         pthread_setname_np(pthread_self(), "main");
 122 #endif // __GLIBC__
 123
 124         if (argc < 2) {
 125                 fprintf(stderr, "[error] missing address\n");
 126                 return EXIT_FAILURE;
 127         }
 128
 129         if (!(client = dragonnet_connect(argv[1]))) {
 130                 fprintf(stderr, "[error] failed to connect to server\n");
 131                 return EXIT_FAILURE;
 132         }
 133
 134         printf("[access] connected to %s\n", client->address);
 135
 136         client->on_disconnect = &on_disconnect;
 137         client->on_recv                                                  = (void *) &on_recv;
 138         client->on_recv_type[DRAGONNET_TYPE_ToClientAuth               ] = (void *) &on_ToClientAuth;
 139         client->on_recv_type[DRAGONNET_TYPE_ToClientChunk              ] = (void *) &on_ToClientChunk;
 140         client->on_recv_type[DRAGONNET_TYPE_ToClientInfo               ] = (void *) &on_ToClientInfo;
 141         client->on_recv_type[DRAGONNET_TYPE_ToClientTimeOfDay          ] = (void *) &on_ToClientTimeOfDay;
 142         client->on_recv_type[DRAGONNET_TYPE_ToClientMovement           ] = (void *) &on_ToClientMovement;
 143         client->on_recv_type[DRAGONNET_TYPE_ToClientEntityAdd          ] = (void *) &client_entity_add;
 144         client->on_recv_type[DRAGONNET_TYPE_ToClientEntityRemove       ] = (void *) &client_entity_remove;
 145         client->on_recv_type[DRAGONNET_TYPE_ToClientEntityUpdatePosRot ] = (void *) &client_entity_update_pos_rot;
 146         client->on_recv_type[DRAGONNET_TYPE_ToClientEntityUpdateNametag] = (void *) &client_entity_update_nametag;
 147         client->on_recv_type[DRAGONNET_TYPE_ToClientPlayerInventory    ] = (void *) &client_inventory_update_player;
 148
 149         flag_ini(&finish);
 150         flag_ini(&gfx_init);
 151
 152         interrupt_init();
 153         client_terrain_init();
 154         client_player_init();
 155         client_entity_init();
 156         dragonnet_peer_run(client);
 157
 158         if (!client_auth_init())
 159                 return EXIT_FAILURE;
 160
 161         if (!game(&gfx_init))
 162                 return EXIT_FAILURE;
 163
 164         dragonnet_peer_shutdown(client);
 165         client_auth_deinit();
 166         client_entity_deinit();
 167         client_player_deinit();
 168         client_terrain_deinit();
 169         interrupt_deinit();
 170
 171         pthread_t recv_thread = client->recv_thread;
 172
 173         flag_set(&finish);
 174         pthread_join(recv_thread, NULL);
 175
 176         flag_dst(&finish);
 177         flag_dst(&gfx_init);
 178
 179         return EXIT_SUCCESS;
 180 }