src/tgchange.c

   1 /*
   2  * charybdis: an advanced Internet Relay Chat Daemon(ircd).
   3  * tgchange.c - code for restricting private messages
   4  *
   5  * Copyright (C) 2004-2005 Lee Hardy <lee@leeh.co.uk>
   6  * Copyright (C) 2005-2010 Jilles Tjoelker <jilles@stack.nl>
   7  * Copyright (C) 2004-2005 ircd-ratbox development team
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  22  *  USA
  23  */
  24
  25 #include "stdinc.h"
  26 #include "tgchange.h"
  27 #include "channel.h"
  28 #include "client.h"
  29 #include "s_stats.h"
  30 #include "hash.h"
  31 #include "s_newconf.h"
  32 #include "s_serv.h"
  33 #include "send.h"
  34
  35 static int add_hashed_target(struct Client *source_p, uint32_t hashv);
  36
  37 struct Channel *
  38 find_allowing_channel(struct Client *source_p, struct Client *target_p)
  39 {
  40         rb_dlink_node *ptr;
  41         struct membership *msptr;
  42
  43         RB_DLINK_FOREACH(ptr, source_p->user->channel.head)
  44         {
  45                 msptr = ptr->data;
  46                 if (is_chanop_voiced(msptr) && IsMember(target_p, msptr->chptr))
  47                         return msptr->chptr;
  48         }
  49         return NULL;
  50 }
  51
  52 int
  53 add_target(struct Client *source_p, struct Client *target_p)
  54 {
  55         uint32_t hashv;
  56
  57         /* can msg themselves or services without using any target slots */
  58         if(source_p == target_p || IsService(target_p))
  59                 return 1;
  60
  61         /* special condition for those who have had PRIVMSG crippled to allow them
  62          * to talk to IRCops still.
  63          *
  64          * XXX: is this controversial?
  65          */
  66         if(source_p->localClient->target_last > rb_current_time() && IsOper(target_p))
  67                 return 1;
  68
  69         hashv = fnv_hash_upper((const unsigned char *)use_id(target_p), 32);
  70         return add_hashed_target(source_p, hashv);
  71 }
  72
  73 int
  74 add_channel_target(struct Client *source_p, struct Channel *chptr)
  75 {
  76         uint32_t hashv;
  77
  78         hashv = fnv_hash_upper((const unsigned char *)chptr->chname, 32);
  79         return add_hashed_target(source_p, hashv);
  80 }
  81
  82 static int
  83 add_hashed_target(struct Client *source_p, uint32_t hashv)
  84 {
  85         int i, j;
  86         uint32_t *targets;
  87
  88         targets = source_p->localClient->targets;
  89
  90         /* check for existing target, and move it to the head */
  91         for(i = 0; i < TGCHANGE_NUM + TGCHANGE_REPLY; i++)
  92         {
  93                 if(targets[i] == hashv)
  94                 {
  95                         for(j = i; j > 0; j--)
  96                                 targets[j] = targets[j - 1];
  97                         targets[0] = hashv;
  98                         return 1;
  99                 }
 100         }
 101
 102         if(source_p->localClient->targets_free < TGCHANGE_NUM)
 103         {
 104                 /* first message after connect, we may only start clearing
 105                  * slots after this message --anfl
 106                  */
 107                 if(!IsTGChange(source_p))
 108                 {
 109                         SetTGChange(source_p);
 110                         source_p->localClient->target_last = rb_current_time();
 111                 }
 112                 /* clear as many targets as we can */
 113                 else if((i = (rb_current_time() - source_p->localClient->target_last) / 60))
 114                 {
 115                         if(i + source_p->localClient->targets_free > TGCHANGE_NUM)
 116                                 source_p->localClient->targets_free = TGCHANGE_NUM;
 117                         else
 118                                 source_p->localClient->targets_free += i;
 119
 120                         source_p->localClient->target_last = rb_current_time();
 121                 }
 122                 /* cant clear any, full target list */
 123                 else if(source_p->localClient->targets_free == 0)
 124                 {
 125                         ServerStats.is_tgch++;
 126                         add_tgchange(source_p->sockhost);
 127
 128                         if (!IsTGExcessive(source_p))
 129                         {
 130                                 SetTGExcessive(source_p);
 131                                 /* This is sent to L_ALL because it's regenerated on all servers
 132                                  * that have the TGINFO module loaded.
 133                                  */
 134                                 sendto_realops_snomask(SNO_BOTS, L_ALL,
 135                                         "Excessive target change from %s (%s@%s)",
 136                                         source_p->name, source_p->username,
 137                                         source_p->orighost);
 138                         }
 139
 140                         sendto_match_servs(source_p, "*", CAP_ENCAP, NOCAPS,
 141                                 "ENCAP * TGINFO 0");
 142
 143                         return 0;
 144                 }
 145         }
 146         /* no targets in use, reset their target_last so that they cant
 147          * abuse a long idle to get targets back more quickly
 148          */
 149         else
 150         {
 151                 source_p->localClient->target_last = rb_current_time();
 152                 SetTGChange(source_p);
 153         }
 154
 155         for(i = TGCHANGE_NUM + TGCHANGE_REPLY - 1; i > 0; i--)
 156                 targets[i] = targets[i - 1];
 157         targets[0] = hashv;
 158         source_p->localClient->targets_free--;
 159         return 1;
 160 }
 161
 162 void
 163 add_reply_target(struct Client *source_p, struct Client *target_p)
 164 {
 165         int i, j;
 166         uint32_t hashv;
 167         uint32_t *targets;
 168
 169         /* can msg themselves or services without using any target slots */
 170         if(source_p == target_p || IsService(target_p))
 171                 return;
 172
 173         hashv = fnv_hash_upper((const unsigned char *)use_id(target_p), 32);
 174         targets = source_p->localClient->targets;
 175
 176         /* check for existing target, and move it to the first reply slot
 177          * if it is in a reply slot
 178          */
 179         for(i = 0; i < TGCHANGE_NUM + TGCHANGE_REPLY; i++)
 180         {
 181                 if(targets[i] == hashv)
 182                 {
 183                         if(i > TGCHANGE_NUM)
 184                         {
 185                                 for(j = i; j > TGCHANGE_NUM; j--)
 186                                         targets[j] = targets[j - 1];
 187                                 targets[TGCHANGE_NUM] = hashv;
 188                         }
 189                         return;
 190                 }
 191         }
 192         for(i = TGCHANGE_NUM + TGCHANGE_REPLY - 1; i > TGCHANGE_NUM; i--)
 193                 targets[i] = targets[i - 1];
 194         targets[TGCHANGE_NUM] = hashv;
 195 }