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 "patricia.h"
  29 #include "client.h"
  30 #include "s_conf.h"
  31 #include "reject.h"
  32 #include "s_stats.h"
  33 #include "msg.h"
  34 #include "hash.h"
  35
  36 static patricia_tree_t *reject_tree;
  37 rb_dlink_list delay_exit;
  38 static rb_dlink_list reject_list;
  39
  40 static patricia_tree_t *unknown_tree;
  41
  42 struct reject_data
  43 {
  44         rb_dlink_node rnode;
  45         time_t time;
  46         unsigned int count;
  47         uint32_t mask_hashv;
  48 };
  49
  50 static patricia_tree_t *unknown_tree;
  51
  52 static void
  53 reject_exit(void *unused)
  54 {
  55         struct Client *client_p;
  56         rb_dlink_node *ptr, *ptr_next;
  57
  58         RB_DLINK_FOREACH_SAFE(ptr, ptr_next, delay_exit.head)
  59         {
  60                 client_p = ptr->data;
  61                 if(IsDead(client_p))
  62                         continue;
  63
  64                 /* this MUST be here, to prevent the possibility
  65                  * sendto_one() generates a write error, and then a client
  66                  * ends up on the dead_list and the abort_list --fl
  67                  *
  68                  * new disconnect notice stolen from ircu --nenolod
  69                  * no, this only happens when someone's IP has some
  70                  * ban on it and rejects them rather longer than the
  71                  * ircu message suggests --jilles
  72                  */
  73                 if(!IsIOError(client_p))
  74                 {
  75                         if(IsExUnknown(client_p))
  76                                 sendto_one(client_p, "ERROR :Closing Link: %s (*** Too many unknown connections)", client_p->host);
  77                         else
  78                                 sendto_one(client_p, "ERROR :Closing Link: %s (*** Banned (cache))", client_p->host);
  79                 }
  80                 close_connection(client_p);
  81                 SetDead(client_p);
  82                 rb_dlinkAddAlloc(client_p, &dead_list);
  83         }
  84
  85         delay_exit.head = delay_exit.tail = NULL;
  86         delay_exit.length = 0;
  87 }
  88
  89 static void
  90 reject_expires(void *unused)
  91 {
  92         rb_dlink_node *ptr, *next;
  93         patricia_node_t *pnode;
  94         struct reject_data *rdata;
  95
  96         RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
  97         {
  98                 pnode = ptr->data;
  99                 rdata = pnode->data;
 100
 101                 if(rdata->time + ConfigFileEntry.reject_duration > rb_current_time())
 102                         continue;
 103
 104                 rb_dlinkDelete(ptr, &reject_list);
 105                 rb_free(rdata);
 106                 patricia_remove(reject_tree, pnode);
 107         }
 108 }
 109
 110 void
 111 init_reject(void)
 112 {
 113         reject_tree = New_Patricia(PATRICIA_BITS);
 114         unknown_tree = New_Patricia(PATRICIA_BITS);
 115         rb_event_add("reject_exit", reject_exit, NULL, DELAYED_EXIT_TIME);
 116         rb_event_add("reject_expires", reject_expires, NULL, 60);
 117 }
 118
 119
 120 void
 121 add_reject(struct Client *client_p, const char *mask1, const char *mask2)
 122 {
 123         patricia_node_t *pnode;
 124         struct reject_data *rdata;
 125         uint32_t hashv;
 126
 127         /* Reject is disabled */
 128         if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_ban_time == 0)
 129                 return;
 130
 131         hashv = 0;
 132         if (mask1 != NULL)
 133                 hashv ^= fnv_hash_upper(mask1, 32);
 134         if (mask2 != NULL)
 135                 hashv ^= fnv_hash_upper(mask2, 32);
 136
 137         if((pnode = match_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip)) != NULL)
 138         {
 139                 rdata = pnode->data;
 140                 rdata->time = rb_current_time();
 141                 rdata->count++;
 142         }
 143         else
 144         {
 145                 int bitlen = 32;
 146 #ifdef IPV6
 147                 if(client_p->localClient->ip.ss_family == AF_INET6)
 148                         bitlen = 128;
 149 #endif
 150                 pnode = make_and_lookup_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip, bitlen);
 151                 pnode->data = rdata = rb_malloc(sizeof(struct reject_data));
 152                 rb_dlinkAddTail(pnode, &rdata->rnode, &reject_list);
 153                 rdata->time = rb_current_time();
 154                 rdata->count = 1;
 155         }
 156         rdata->mask_hashv = hashv;
 157 }
 158
 159 int
 160 check_reject(struct Client *client_p)
 161 {
 162         patricia_node_t *pnode;
 163         struct reject_data *rdata;
 164
 165         /* Reject is disabled */
 166         if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_ban_time == 0 ||
 167            ConfigFileEntry.reject_duration == 0)
 168                 return 0;
 169
 170         pnode = match_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip);
 171         if(pnode != NULL)
 172         {
 173                 rdata = pnode->data;
 174
 175                 rdata->time = rb_current_time();
 176                 if(rdata->count > ConfigFileEntry.reject_after_count)
 177                 {
 178                         ServerStats->is_rej++;
 179                         SetReject(client_p);
 180                         rb_setselect(client_p->localClient->F->fd, FDLIST_NONE, COMM_SELECT_WRITE | COMM_SELECT_READ, NULL, NULL, 0);
 181                         SetClosing(client_p);
 182                         rb_dlinkMoveNode(&client_p->localClient->tnode, &unknown_list, &delay_exit);
 183                         return 1;
 184                 }
 185         }
 186         /* Caller does what it wants */
 187         return 0;
 188 }
 189
 190 void
 191 flush_reject(void)
 192 {
 193         rb_dlink_node *ptr, *next;
 194         patricia_node_t *pnode;
 195         struct reject_data *rdata;
 196
 197         RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
 198         {
 199                 pnode = ptr->data;
 200                 rdata = pnode->data;
 201                 rb_dlinkDelete(ptr, &reject_list);
 202                 rb_free(rdata);
 203                 patricia_remove(reject_tree, pnode);
 204         }
 205 }
 206
 207 int
 208 remove_reject_ip(const char *ip)
 209 {
 210         patricia_node_t *pnode;
 211
 212         /* Reject is disabled */
 213         if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_ban_time == 0 ||
 214            ConfigFileEntry.reject_duration == 0)
 215                 return -1;
 216
 217         if((pnode = match_string(reject_tree, ip)) != NULL)
 218         {
 219                 struct reject_data *rdata = pnode->data;
 220                 rb_dlinkDelete(&rdata->rnode, &reject_list);
 221                 rb_free(rdata);
 222                 patricia_remove(reject_tree, pnode);
 223                 return 1;
 224         }
 225         return 0;
 226 }
 227
 228 int
 229 remove_reject_mask(const char *mask1, const char *mask2)
 230 {
 231         rb_dlink_node *ptr, *next;
 232         patricia_node_t *pnode;
 233         struct reject_data *rdata;
 234         uint32_t hashv;
 235         int n = 0;
 236
 237         hashv = 0;
 238         if (mask1 != NULL)
 239                 hashv ^= fnv_hash_upper(mask1, 32);
 240         if (mask2 != NULL)
 241                 hashv ^= fnv_hash_upper(mask2, 32);
 242         RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
 243         {
 244                 pnode = ptr->data;
 245                 rdata = pnode->data;
 246                 if (rdata->mask_hashv == hashv)
 247                 {
 248                         rb_dlinkDelete(ptr, &reject_list);
 249                         rb_free(rdata);
 250                         patricia_remove(reject_tree, pnode);
 251                         n++;
 252                 }
 253         }
 254         return n;
 255 }
 256
 257
 258 int
 259 add_unknown_ip(struct Client *client_p)
 260 {
 261         patricia_node_t *pnode;
 262
 263         if((pnode = match_ip(unknown_tree, (struct sockaddr *)&client_p->localClient->ip)) == NULL)
 264         {
 265                 int bitlen = 32;
 266 #ifdef IPV6
 267                 if(client_p->localClient->ip.ss_family == AF_INET6)
 268                         bitlen = 128;
 269 #endif
 270                 pnode = make_and_lookup_ip(unknown_tree, (struct sockaddr *)&client_p->localClient->ip, bitlen);
 271                 pnode->data = (void *)0;
 272         }
 273
 274         if((unsigned long)pnode->data >= ConfigFileEntry.max_unknown_ip)
 275         {
 276                 SetExUnknown(client_p);
 277                 SetReject(client_p);
 278                 rb_setselect(client_p->localClient->F->fd, FDLIST_NONE, COMM_SELECT_WRITE | COMM_SELECT_READ, NULL, NULL, 0);
 279                 SetClosing(client_p);
 280                 rb_dlinkMoveNode(&client_p->localClient->tnode, &unknown_list, &delay_exit);
 281                 return 1;
 282         }
 283
 284         pnode->data = (void *)((unsigned long)pnode->data + 1);
 285
 286         return 0;
 287 }
 288
 289 void
 290 del_unknown_ip(struct Client *client_p)
 291 {
 292         patricia_node_t *pnode;
 293
 294         if((pnode = match_ip(unknown_tree, (struct sockaddr *)&client_p->localClient->ip)) != NULL)
 295         {
 296                 pnode->data = (void *)((unsigned long)pnode->data - 1);
 297                 if((unsigned long)pnode->data <= 0)
 298                 {
 299                         patricia_remove(unknown_tree, pnode);
 300                 }
 301         }
 302         /* this can happen due to m_webirc.c's manipulations, for example */
 303 }