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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
  21  *  USA
  22  *
  23  *  $Id: reject.c 25119 2008-03-13 16:57:05Z androsyn $
  24  */
  25
  26 #include "stdinc.h"
  27 #include "client.h"
  28 #include "s_conf.h"
  29 #include "reject.h"
  30 #include "s_stats.h"
  31 #include "ircd.h"
  32 #include "send.h"
  33 #include "numeric.h"
  34 #include "parse.h"
  35 #include "hostmask.h"
  36 #include "match.h"
  37 #include "hash.h"
  38
  39 static rb_patricia_tree_t *reject_tree;
  40 static rb_dlink_list delay_exit;
  41 static rb_dlink_list reject_list;
  42 static rb_dlink_list throttle_list;
  43 static rb_patricia_tree_t *throttle_tree;
  44 static void throttle_expires(void *unused);
  45
  46
  47 typedef struct _reject_data
  48 {
  49         rb_dlink_node rnode;
  50         time_t time;
  51         unsigned int count;
  52         uint32_t mask_hashv;
  53 } reject_t;
  54
  55 typedef struct _delay_data
  56 {
  57         rb_dlink_node node;
  58         rb_fde_t *F;
  59 } delay_t;
  60
  61 typedef struct _throttle
  62 {
  63         rb_dlink_node node;
  64         time_t last;
  65         int count;
  66 } throttle_t;
  67
  68 unsigned long
  69 delay_exit_length(void)
  70 {
  71         return rb_dlink_list_length(&delay_exit);
  72 }
  73
  74 static void
  75 reject_exit(void *unused)
  76 {
  77         rb_dlink_node *ptr, *ptr_next;
  78         delay_t *ddata;
  79         static const char *errbuf = "ERROR :Closing Link: (*** Banned (cache))\r\n";
  80
  81         RB_DLINK_FOREACH_SAFE(ptr, ptr_next, delay_exit.head)
  82         {
  83                 ddata = ptr->data;
  84
  85                 rb_write(ddata->F, errbuf, strlen(errbuf));
  86                 rb_close(ddata->F);
  87                 rb_free(ddata);
  88         }
  89
  90         delay_exit.head = delay_exit.tail = NULL;
  91         delay_exit.length = 0;
  92 }
  93
  94 static void
  95 reject_expires(void *unused)
  96 {
  97         rb_dlink_node *ptr, *next;
  98         rb_patricia_node_t *pnode;
  99         reject_t *rdata;
 100
 101         RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
 102         {
 103                 pnode = ptr->data;
 104                 rdata = pnode->data;
 105
 106                 if(rdata->time + ConfigFileEntry.reject_duration > rb_current_time())
 107                         continue;
 108
 109                 rb_dlinkDelete(ptr, &reject_list);
 110                 rb_free(rdata);
 111                 rb_patricia_remove(reject_tree, pnode);
 112         }
 113 }
 114
 115 void
 116 init_reject(void)
 117 {
 118         reject_tree = rb_new_patricia(PATRICIA_BITS);
 119         throttle_tree = rb_new_patricia(PATRICIA_BITS);
 120         rb_event_add("reject_exit", reject_exit, NULL, DELAYED_EXIT_TIME);
 121         rb_event_add("reject_expires", reject_expires, NULL, 60);
 122         rb_event_add("throttle_expires", throttle_expires, NULL, 10);
 123 }
 124
 125
 126 void
 127 add_reject(struct Client *client_p, const char *mask1, const char *mask2)
 128 {
 129         rb_patricia_node_t *pnode;
 130         reject_t *rdata;
 131         uint32_t hashv;
 132
 133         /* Reject is disabled */
 134         if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0)
 135                 return;
 136
 137         hashv = 0;
 138         if (mask1 != NULL)
 139                 hashv ^= fnv_hash_upper((const unsigned char *)mask1, 32);
 140         if (mask2 != NULL)
 141                 hashv ^= fnv_hash_upper((const unsigned char *)mask2, 32);
 142
 143         if((pnode = rb_match_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip)) != NULL)
 144         {
 145                 rdata = pnode->data;
 146                 rdata->time = rb_current_time();
 147                 rdata->count++;
 148         }
 149         else
 150         {
 151                 int bitlen = 32;
 152 #ifdef RB_IPV6
 153                 if(GET_SS_FAMILY(&client_p->localClient->ip) == AF_INET6)
 154                         bitlen = 128;
 155 #endif
 156                 pnode = make_and_lookup_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip, bitlen);
 157                 pnode->data = rdata = rb_malloc(sizeof(reject_t));
 158                 rb_dlinkAddTail(pnode, &rdata->rnode, &reject_list);
 159                 rdata->time = rb_current_time();
 160                 rdata->count = 1;
 161         }
 162         rdata->mask_hashv = hashv;
 163 }
 164
 165 int
 166 check_reject(rb_fde_t *F, struct sockaddr *addr)
 167 {
 168         rb_patricia_node_t *pnode;
 169         reject_t *rdata;
 170         delay_t *ddata;
 171         /* Reject is disabled */
 172         if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0)
 173                 return 0;
 174
 175         pnode = rb_match_ip(reject_tree, addr);
 176         if(pnode != NULL)
 177         {
 178                 rdata = pnode->data;
 179
 180                 rdata->time = rb_current_time();
 181                 if(rdata->count > (unsigned long)ConfigFileEntry.reject_after_count)
 182                 {
 183                         ddata = rb_malloc(sizeof(delay_t));
 184                         ServerStats.is_rej++;
 185                         rb_setselect(F, RB_SELECT_WRITE | RB_SELECT_READ, NULL, NULL);
 186                         ddata->F = F;
 187                         rb_dlinkAdd(ddata, &ddata->node, &delay_exit);
 188                         return 1;
 189                 }
 190         }
 191         /* Caller does what it wants */
 192         return 0;
 193 }
 194
 195 void
 196 flush_reject(void)
 197 {
 198         rb_dlink_node *ptr, *next;
 199         rb_patricia_node_t *pnode;
 200         reject_t *rdata;
 201
 202         RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
 203         {
 204                 pnode = ptr->data;
 205                 rdata = pnode->data;
 206                 rb_dlinkDelete(ptr, &reject_list);
 207                 rb_free(rdata);
 208                 rb_patricia_remove(reject_tree, pnode);
 209         }
 210 }
 211
 212 int
 213 remove_reject_ip(const char *ip)
 214 {
 215         rb_patricia_node_t *pnode;
 216
 217         /* Reject is disabled */
 218         if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0)
 219                 return -1;
 220
 221         if((pnode = rb_match_string(reject_tree, ip)) != NULL)
 222         {
 223                 reject_t *rdata = pnode->data;
 224                 rb_dlinkDelete(&rdata->rnode, &reject_list);
 225                 rb_free(rdata);
 226                 rb_patricia_remove(reject_tree, pnode);
 227                 return 1;
 228         }
 229         return 0;
 230 }
 231
 232 int
 233 remove_reject_mask(const char *mask1, const char *mask2)
 234 {
 235         rb_dlink_node *ptr, *next;
 236         rb_patricia_node_t *pnode;
 237         reject_t *rdata;
 238         uint32_t hashv;
 239         int n = 0;
 240
 241         hashv = 0;
 242         if (mask1 != NULL)
 243                 hashv ^= fnv_hash_upper((const unsigned char *)mask1, 32);
 244         if (mask2 != NULL)
 245                 hashv ^= fnv_hash_upper((const unsigned char *)mask2, 32);
 246         RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
 247         {
 248                 pnode = ptr->data;
 249                 rdata = pnode->data;
 250                 if (rdata->mask_hashv == hashv)
 251                 {
 252                         rb_dlinkDelete(ptr, &reject_list);
 253                         rb_free(rdata);
 254                         rb_patricia_remove(reject_tree, pnode);
 255                         n++;
 256                 }
 257         }
 258         return n;
 259 }
 260
 261 int
 262 throttle_add(struct sockaddr *addr)
 263 {
 264         throttle_t *t;
 265         rb_patricia_node_t *pnode;
 266
 267         if((pnode = rb_match_ip(throttle_tree, addr)) != NULL)
 268         {
 269                 t = pnode->data;
 270
 271                 if(t->count > ConfigFileEntry.throttle_count)
 272                         return 1;
 273
 274                 /* Stop penalizing them after they've been throttled */
 275                 t->last = rb_current_time();
 276                 t->count++;
 277
 278         } else {
 279                 int bitlen = 32;
 280 #ifdef RB_IPV6
 281                 if(GET_SS_FAMILY(addr) == AF_INET6)
 282                         bitlen = 128;
 283 #endif
 284                 t = rb_malloc(sizeof(throttle_t));
 285                 t->last = rb_current_time();
 286                 t->count = 1;
 287                 pnode = make_and_lookup_ip(throttle_tree, addr, bitlen);
 288                 pnode->data = t;
 289                 rb_dlinkAdd(pnode, &t->node, &throttle_list);
 290         }
 291         return 0;
 292 }
 293
 294 static void
 295 throttle_expires(void *unused)
 296 {
 297         rb_dlink_node *ptr, *next;
 298         rb_patricia_node_t *pnode;
 299         throttle_t *t;
 300
 301         RB_DLINK_FOREACH_SAFE(ptr, next, throttle_list.head)
 302         {
 303                 pnode = ptr->data;
 304                 t = pnode->data;
 305
 306                 if(t->last + ConfigFileEntry.throttle_duration > rb_current_time())
 307                         continue;
 308
 309                 rb_dlinkDelete(ptr, &throttle_list);
 310                 rb_free(t);
 311                 rb_patricia_remove(throttle_tree, pnode);
 312         }
 313 }
 314