src/client/client_commands.c

   1 #include <stdio.h>
   2 #include <unistd.h>
   3 #include <dragontype/number.h>
   4 #include "client/client.h"
   5 #include "client/client_map.h"
   6 #include "client/client_player.h"
   7 #include "day.h"
   8 #include "perlin.h"
   9 #include "util.h"
  10
  11 static bool disconnect_handler(unused Client *client, bool good)
  12 {
  13         if (good)
  14                 client_disconnect(false, NULL);
  15         return true;
  16 }
  17
  18 static bool auth_handler(Client *client, bool good)
  19 {
  20         u8 success;
  21         if (! read_u8(client->fd, &success))
  22                 return false;
  23
  24         if (! good)
  25                 return true;
  26
  27         if (success) {
  28                 printf("Authenticated successfully\n");
  29                 client->state = CS_ACTIVE;
  30         } else {
  31                 printf("Authentication failed, please try again\n");
  32                 client->state = CS_CREATED;
  33         }
  34
  35         return true;
  36 }
  37
  38 static bool block_handler(Client *client, bool good)
  39 {
  40         v3s32 pos;
  41
  42         if (! read_v3s32(client->fd, &pos))
  43                 return false;
  44
  45         size_t size;
  46
  47         if (! read_u64(client->fd, &size))
  48                 return false;
  49
  50         if (size > sizeof(MapBlockData))        // guard to prevent malicious or malfunctioning packets from allocating huge unnecessary amounts of memory
  51                 return false;
  52
  53         char data[size];
  54         if (! read_full(client->fd, data, size))
  55                 return false;
  56
  57         MapBlock *block;
  58
  59         if (good)
  60                 block = map_get_block(client_map.map, pos, true);
  61         else
  62                 block = map_allocate_block(pos);
  63
  64         bool ret = map_deserialize_block(block, data, size);
  65
  66         if (good)
  67                 client_map_block_received(block);
  68         else
  69                 map_free_block(block);
  70
  71         return ret;
  72 }
  73
  74 static bool info_handler(Client *client, bool good)
  75 {
  76         u32 simulation_distance;
  77         s32 server_seed;
  78
  79         if (! (read_u32(client->fd, &simulation_distance) && read_s32(client->fd, &server_seed)))
  80                 return false;
  81
  82         if (good) {
  83                 client_map_set_simulation_distance(simulation_distance);
  84                 seed = server_seed;
  85         }
  86
  87         return true;
  88 }
  89
  90 static bool setpos_handler(Client *client, bool good)
  91 {
  92         v3f64 pos;
  93
  94         if (! read_v3f64(client->fd, &pos))
  95                 return false;
  96
  97         if (good)
  98                 client_player_set_position(pos);
  99
 100         return true;
 101 }
 102
 103 static bool timeofday_handler(Client *client, bool good)
 104 {
 105         u64 time_of_day;
 106
 107         if (! read_u64(client->fd, &time_of_day))
 108                 return false;
 109
 110         if (good)
 111                 set_time_of_day(time_of_day);
 112
 113         return true;
 114 }
 115
 116 CommandHandler command_handlers[CLIENT_COMMAND_COUNT] = {
 117         {0},
 118         {&disconnect_handler, "DISCONNECT", CS_CREATED | CS_AUTH | CS_ACTIVE},
 119         {&auth_handler, "AUTH", CS_AUTH},
 120         {&block_handler, "BLOCK", CS_ACTIVE},
 121         {&info_handler, "INFO", CS_ACTIVE},
 122         {&setpos_handler, "SETPOS", CS_ACTIVE},
 123         {&timeofday_handler, "TIMEOFDAY", CS_ACTIVE},
 124 };