src/reject.c

   1 /*
   2  *  ircd-ratbox: A slightly useful ircd
   3  *  reject.c: reject users with prejudice
   4  *
   5  *  Copyright (C) 2003 Aaron Sethman <androsyn@ratbox.org>
   6  *  Copyright (C) 2003-2005 ircd-ratbox development team
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  21  *  USA
  22  *
  23  *  $Id: reject.c 3456 2007-05-18 19:14:18Z jilles $
  24  */
  25
  26 #include "stdinc.h"
  27 #include "config.h"
  28 #include "client.h"
  29 #include "s_conf.h"
  30 #include "reject.h"
  31 #include "s_stats.h"
  32 #include "msg.h"
  33 #include "hash.h"
  34
  35 static rb_patricia_tree_t *reject_tree;
  36 rb_dlink_list delay_exit;
  37 static rb_dlink_list reject_list;
  38
  39 static rb_patricia_tree_t *unknown_tree;
  40
  41 struct reject_data
  42 {
  43         rb_dlink_node rnode;
  44         time_t time;
  45         unsigned int count;
  46         uint32_t mask_hashv;
  47 };
  48
  49 static rb_patricia_tree_t *unknown_tree;
  50
  51 static void
  52 reject_exit(void *unused)
  53 {
  54         struct Client *client_p;
  55         rb_dlink_node *ptr, *ptr_next;
  56
  57         RB_DLINK_FOREACH_SAFE(ptr, ptr_next, delay_exit.head)
  58         {
  59                 client_p = ptr->data;
  60                 if(IsDead(client_p))
  61                         continue;
  62
  63                 /* this MUST be here, to prevent the possibility
  64                  * sendto_one() generates a write error, and then a client
  65                  * ends up on the dead_list and the abort_list --fl
  66                  *
  67                  * new disconnect notice stolen from ircu --nenolod
  68                  * no, this only happens when someone's IP has some
  69                  * ban on it and rejects them rather longer than the
  70                  * ircu message suggests --jilles
  71                  */
  72                 if(!IsIOError(client_p))
  73                 {
  74                         if(IsExUnknown(client_p))
  75                                 sendto_one(client_p, "ERROR :Closing Link: %s (*** Too many unknown connections)", client_p->host);
  76                         else
  77                                 sendto_one(client_p, "ERROR :Closing Link: %s (*** Banned (cache))", client_p->host);
  78                 }
  79                 close_connection(client_p);
  80                 SetDead(client_p);
  81                 rb_dlinkAddAlloc(client_p, &dead_list);
  82         }
  83
  84         delay_exit.head = delay_exit.tail = NULL;
  85         delay_exit.length = 0;
  86 }
  87
  88 static void
  89 reject_expires(void *unused)
  90 {
  91         rb_dlink_node *ptr, *next;
  92         rb_patricia_node_t *pnode;
  93         struct reject_data *rdata;
  94
  95         RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
  96         {
  97                 pnode = ptr->data;
  98                 rdata = pnode->data;
  99
 100                 if(rdata->time + ConfigFileEntry.reject_duration > rb_current_time())
 101                         continue;
 102
 103                 rb_dlinkDelete(ptr, &reject_list);
 104                 rb_free(rdata);
 105                 rb_patricia_remove(reject_tree, pnode);
 106         }
 107 }
 108
 109 void
 110 init_reject(void)
 111 {
 112         reject_tree = rb_new_patricia(PATRICIA_BITS);
 113         unknown_tree = rb_new_patricia(PATRICIA_BITS);
 114         rb_event_add("reject_exit", reject_exit, NULL, DELAYED_EXIT_TIME);
 115         rb_event_add("reject_expires", reject_expires, NULL, 60);
 116 }
 117
 118
 119 void
 120 add_reject(struct Client *client_p, const char *mask1, const char *mask2)
 121 {
 122         rb_patricia_node_t *pnode;
 123         struct reject_data *rdata;
 124         uint32_t hashv;
 125
 126         /* Reject is disabled */
 127         if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_ban_time == 0)
 128                 return;
 129
 130         hashv = 0;
 131         if (mask1 != NULL)
 132                 hashv ^= fnv_hash_upper(mask1, 32);
 133         if (mask2 != NULL)
 134                 hashv ^= fnv_hash_upper(mask2, 32);
 135
 136         if((pnode = rb_match_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip)) != NULL)
 137         {
 138                 rdata = pnode->data;
 139                 rdata->time = rb_current_time();
 140                 rdata->count++;
 141         }
 142         else
 143         {
 144                 int bitlen = 32;
 145 #ifdef RB_IPV6
 146                 if(client_p->localClient->ip.ss_family == AF_INET6)
 147                         bitlen = 128;
 148 #endif
 149                 pnode = make_and_lookup_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip, bitlen);
 150                 pnode->data = rdata = rb_malloc(sizeof(struct reject_data));
 151                 rb_dlinkAddTail(pnode, &rdata->rnode, &reject_list);
 152                 rdata->time = rb_current_time();
 153                 rdata->count = 1;
 154         }
 155         rdata->mask_hashv = hashv;
 156 }
 157
 158 int
 159 check_reject(struct Client *client_p)
 160 {
 161         rb_patricia_node_t *pnode;
 162         struct reject_data *rdata;
 163
 164         /* Reject is disabled */
 165         if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_ban_time == 0 ||
 166            ConfigFileEntry.reject_duration == 0)
 167                 return 0;
 168
 169         pnode = rb_match_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip);
 170         if(pnode != NULL)
 171         {
 172                 rdata = pnode->data;
 173
 174                 rdata->time = rb_current_time();
 175                 if(rdata->count > ConfigFileEntry.reject_after_count)
 176                 {
 177                         ServerStats.is_rej++;
 178                         SetReject(client_p);
 179                         rb_setselect(client_p->localClient->F, RB_SELECT_WRITE | RB_SELECT_READ, NULL, NULL);
 180                         SetClosing(client_p);
 181                         rb_dlinkMoveNode(&client_p->localClient->tnode, &unknown_list, &delay_exit);
 182                         return 1;
 183                 }
 184         }
 185         /* Caller does what it wants */
 186         return 0;
 187 }
 188
 189 void
 190 flush_reject(void)
 191 {
 192         rb_dlink_node *ptr, *next;
 193         rb_patricia_node_t *pnode;
 194         struct reject_data *rdata;
 195
 196         RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
 197         {
 198                 pnode = ptr->data;
 199                 rdata = pnode->data;
 200                 rb_dlinkDelete(ptr, &reject_list);
 201                 rb_free(rdata);
 202                 rb_patricia_remove(reject_tree, pnode);
 203         }
 204 }
 205
 206 int
 207 remove_reject_ip(const char *ip)
 208 {
 209         rb_patricia_node_t *pnode;
 210
 211         /* Reject is disabled */
 212         if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_ban_time == 0 ||
 213            ConfigFileEntry.reject_duration == 0)
 214                 return -1;
 215
 216         if((pnode = rb_match_string(reject_tree, ip)) != NULL)
 217         {
 218                 struct reject_data *rdata = pnode->data;
 219                 rb_dlinkDelete(&rdata->rnode, &reject_list);
 220                 rb_free(rdata);
 221                 rb_patricia_remove(reject_tree, pnode);
 222                 return 1;
 223         }
 224         return 0;
 225 }
 226
 227 int
 228 remove_reject_mask(const char *mask1, const char *mask2)
 229 {
 230         rb_dlink_node *ptr, *next;
 231         rb_patricia_node_t *pnode;
 232         struct reject_data *rdata;
 233         uint32_t hashv;
 234         int n = 0;
 235
 236         hashv = 0;
 237         if (mask1 != NULL)
 238                 hashv ^= fnv_hash_upper(mask1, 32);
 239         if (mask2 != NULL)
 240                 hashv ^= fnv_hash_upper(mask2, 32);
 241         RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
 242         {
 243                 pnode = ptr->data;
 244                 rdata = pnode->data;
 245                 if (rdata->mask_hashv == hashv)
 246                 {
 247                         rb_dlinkDelete(ptr, &reject_list);
 248                         rb_free(rdata);
 249                         rb_patricia_remove(reject_tree, pnode);
 250                         n++;
 251                 }
 252         }
 253         return n;
 254 }
 255
 256
 257 int
 258 add_unknown_ip(struct Client *client_p)
 259 {
 260         rb_patricia_node_t *pnode;
 261
 262         if((pnode = rb_match_ip(unknown_tree, (struct sockaddr *)&client_p->localClient->ip)) == NULL)
 263         {
 264                 int bitlen = 32;
 265 #ifdef RB_IPV6
 266                 if(client_p->localClient->ip.ss_family == AF_INET6)
 267                         bitlen = 128;
 268 #endif
 269                 pnode = make_and_lookup_ip(unknown_tree, (struct sockaddr *)&client_p->localClient->ip, bitlen);
 270                 pnode->data = (void *)0;
 271         }
 272
 273         if((unsigned long)pnode->data >= ConfigFileEntry.max_unknown_ip)
 274         {
 275                 SetExUnknown(client_p);
 276                 SetReject(client_p);
 277                 rb_setselect(client_p->localClient->F, RB_SELECT_WRITE | RB_SELECT_READ, NULL, NULL);
 278                 SetClosing(client_p);
 279                 rb_dlinkMoveNode(&client_p->localClient->tnode, &unknown_list, &delay_exit);
 280                 return 1;
 281         }
 282
 283         pnode->data = (void *)((unsigned long)pnode->data + 1);
 284
 285         return 0;
 286 }
 287
 288 void
 289 del_unknown_ip(struct Client *client_p)
 290 {
 291         rb_patricia_node_t *pnode;
 292
 293         if((pnode = rb_match_ip(unknown_tree, (struct sockaddr *)&client_p->localClient->ip)) != NULL)
 294         {
 295                 pnode->data = (void *)((unsigned long)pnode->data - 1);
 296                 if((unsigned long)pnode->data <= 0)
 297                 {
 298                         rb_patricia_remove(unknown_tree, pnode);
 299                 }
 300         }
 301         /* this can happen due to m_webirc.c's manipulations, for example */
 302 }