src/ban.c

   1 /************************************************************************
   2 * ban.c
   3 * voxelands - 3d voxel world sandbox game
   4 * Copyright (C) Lisa 'darkrose' Milne 2016 <lisa@ltmnet.com>
   5 *
   6 * This program is free software: you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation, either version 3 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful, but
  12 * WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  14 * See the GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program.  If not, see <http://www.gnu.org/licenses/>
  18 ************************************************************************/
  19
  20 #include "common.h"
  21 #include "ban.h"
  22
  23 #include "file.h"
  24 #include "thread.h"
  25 #include "nvp.h"
  26 #include "list.h"
  27 #include "path.h"
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32
  33 static struct {
  34         char* file;
  35         mutex_t *mutex;
  36         nvp_t *data;
  37         char modified;
  38 } ban = {
  39         NULL,
  40         NULL,
  41         NULL,
  42         0
  43 };
  44
  45 /* init ban system for the given file */
  46 int ban_init(char* file)
  47 {
  48         char* path;
  49         if (!ban.mutex) {
  50                 ban.mutex = mutex_create();
  51                 if (!ban.mutex)
  52                         return -1;
  53         }
  54
  55         path = path_get("game",file,0,NULL,0);
  56         if (!path)
  57                 return -1;
  58
  59         if (ban.file) {
  60                 if (!strcmp(ban.file,path)) {
  61                         free(path);
  62                         ban_load();
  63                         return 0;
  64                 }
  65                 if (ban.file)
  66                         free(ban.file);
  67                 ban.file = NULL;
  68
  69                 nvp_free(&ban.data,1);
  70                 ban.data = NULL;
  71         }
  72
  73         ban.file = path;
  74         ban.modified = 0;
  75
  76         ban_load();
  77
  78         return 0;
  79 }
  80
  81 /* free ban memory, reset ban struct */
  82 void ban_exit()
  83 {
  84         if (ban.modified)
  85                 ban_save();
  86
  87         mutex_free(ban.mutex);
  88         ban.mutex = NULL;
  89
  90         if (ban.file)
  91                 free(ban.file);
  92         ban.file = NULL;
  93
  94         nvp_free(&ban.data,1);
  95         ban.data = NULL;
  96
  97         ban.modified = 0;
  98 }
  99
 100 /* load ban data from file */
 101 void ban_load()
 102 {
 103         file_t *f;
 104         char line[512];
 105         char* n;
 106         char* p;
 107
 108         mutex_lock(ban.mutex);
 109
 110         f = file_load(NULL,ban.file);
 111         if (!f)
 112                 return;
 113
 114         while (file_readline(f,line,512)) {
 115
 116                 p = line;
 117                 n = strchr(p,'|');
 118                 if (!n)
 119                         continue;
 120                 *n = 0;
 121                 n++;
 122
 123                 if (!p[0])
 124                         continue;
 125
 126                 nvp_set(&ban.data,p,n,NULL);
 127         }
 128
 129         mutex_unlock(ban.mutex);
 130
 131         file_free(f);
 132
 133         ban.modified = 0;
 134 }
 135
 136 /* save ban data to file */
 137 void ban_save()
 138 {
 139         file_t *f;
 140         nvp_t *n;
 141
 142         if (!ban.modified)
 143                 return;
 144
 145         mutex_lock(ban.mutex);
 146
 147         f = file_create(NULL,ban.file);
 148         if (!f)
 149                 return;
 150
 151         for (n=ban.data; n; n = n->next) {
 152                 if (!n->name || !n->name[0])
 153                         continue;
 154                 file_writef(f,"%s|%s\n",n->name,n->value);
 155         }
 156
 157         file_flush(f);
 158
 159         mutex_unlock(ban.mutex);
 160
 161         file_free(f);
 162
 163         ban.modified = 0;
 164 }
 165
 166 /* check if an ip address is banned */
 167 int ban_ipbanned(char* ip)
 168 {
 169         nvp_t *n;
 170         mutex_lock(ban.mutex);
 171
 172         n = nvp_get(&ban.data,ip);
 173
 174         mutex_unlock(ban.mutex);
 175
 176         if (n)
 177                 return 1;
 178         return 0;
 179 }
 180
 181 /* get the discription of a ban, NULL for all */
 182 int ban_description(char* ip_or_name, char* buff, int size)
 183 {
 184         nvp_t *n;
 185         int o = 0;
 186         if (!buff || !size)
 187                 return -1;
 188
 189         buff[0] = 0;
 190
 191         if (!ip_or_name) {
 192                 char b1[256];
 193                 int c = 0;
 194                 int k;
 195
 196                 mutex_lock(ban.mutex);
 197
 198                 for (n=ban.data; n; n=n->next) {
 199                         k = snprintf(b1,256,"%s|%s",n->name,n->value);
 200                         if (k >= 256)
 201                                 continue;
 202                         if (k+o+3 >= size)
 203                                 break;
 204                         if (c) {
 205                                 buff[o++] = ',';
 206                                 buff[o++] = ' ';
 207                                 buff[o] = 0;
 208                         }
 209                         if (!strcpy(buff+o,b1))
 210                                 break;
 211                         o += k;
 212                         c++;
 213                 }
 214
 215                 mutex_unlock(ban.mutex);
 216
 217                 buff[o] = 0;
 218
 219                 return c;
 220         }
 221
 222         mutex_lock(ban.mutex);
 223
 224         n = nvp_get(&ban.data,ip_or_name);
 225
 226         if (!n) {
 227                 n = ban.data;
 228                 while (n) {
 229                         if (!strcmp(n->value,ip_or_name))
 230                                 break;
 231                         n = n->next;
 232                 }
 233         }
 234
 235         mutex_unlock(ban.mutex);
 236
 237         if (!n)
 238                 return 0;
 239
 240         o = snprintf(buff,size,"%s|%s",n->name,n->value);
 241         if (o >= size)
 242                 return -1;
 243
 244         return 1;
 245 }
 246
 247 /* get the name for a given ip ban */
 248 char* ban_ip2name(char* ip)
 249 {
 250         char* n;
 251
 252         mutex_lock(ban.mutex);
 253
 254         n = nvp_get_str(&ban.data,ip);
 255
 256         mutex_unlock(ban.mutex);
 257
 258         return n;
 259 }
 260
 261 /* add a new ban */
 262 void ban_add(char* ip, char* name)
 263 {
 264         mutex_lock(ban.mutex);
 265
 266         nvp_set(&ban.data,ip,name,NULL);
 267
 268         mutex_unlock(ban.mutex);
 269 }
 270
 271 /* remove an existing ban */
 272 void ban_remove(char* ip_or_name)
 273 {
 274         nvp_t *n;
 275         mutex_lock(ban.mutex);
 276
 277         n = nvp_get(&ban.data,ip_or_name);
 278
 279         if (!n) {
 280                 for (n=ban.data; n; n=n->next) {
 281                         if (!strcmp(n->value,ip_or_name))
 282                                 break;
 283                 }
 284                 if (!n) {
 285                         mutex_unlock(ban.mutex);
 286                         return;
 287                 }
 288         }
 289
 290         ban.data = list_remove(&ban.data,n);
 291
 292         mutex_unlock(ban.mutex);
 293
 294         if (n->name)
 295                 free(n->name);
 296         if (n->value)
 297                 free(n->value);
 298         free(n);
 299 }