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
  34 static int add_hashed_target(struct Client *source_p, uint32_t hashv);
  35
  36 struct Channel *
  37 find_allowing_channel(struct Client *source_p, struct Client *target_p)
  38 {
  39         rb_dlink_node *ptr;
  40         struct membership *msptr;
  41
  42         RB_DLINK_FOREACH(ptr, source_p->user->channel.head)
  43         {
  44                 msptr = ptr->data;
  45                 if (is_chanop_voiced(msptr) && IsMember(target_p, msptr->chptr))
  46                         return msptr->chptr;
  47         }
  48         return NULL;
  49 }
  50
  51 int
  52 add_target(struct Client *source_p, struct Client *target_p)
  53 {
  54         uint32_t hashv;
  55
  56         /* can msg themselves or services without using any target slots */
  57         if(source_p == target_p || IsService(target_p))
  58                 return 1;
  59
  60         /* special condition for those who have had PRIVMSG crippled to allow them
  61          * to talk to IRCops still.
  62          *
  63          * XXX: is this controversial?
  64          */
  65         if(source_p->localClient->target_last > rb_current_time() && IsOper(target_p))
  66                 return 1;
  67
  68         hashv = fnv_hash_upper((const unsigned char *)use_id(target_p), 32);
  69         return add_hashed_target(source_p, hashv);
  70 }
  71
  72 int
  73 add_channel_target(struct Client *source_p, struct Channel *chptr)
  74 {
  75         uint32_t hashv;
  76
  77         hashv = fnv_hash_upper((const unsigned char *)chptr->chname, 32);
  78         return add_hashed_target(source_p, hashv);
  79 }
  80
  81 static int
  82 add_hashed_target(struct Client *source_p, uint32_t hashv)
  83 {
  84         int i, j;
  85         uint32_t *targets;
  86
  87         targets = source_p->localClient->targets;
  88
  89         /* check for existing target, and move it to the head */
  90         for(i = 0; i < TGCHANGE_NUM + TGCHANGE_REPLY; i++)
  91         {
  92                 if(targets[i] == hashv)
  93                 {
  94                         for(j = i; j > 0; j--)
  95                                 targets[j] = targets[j - 1];
  96                         targets[0] = hashv;
  97                         return 1;
  98                 }
  99         }
 100
 101         if(source_p->localClient->targets_free < TGCHANGE_NUM)
 102         {
 103                 /* first message after connect, we may only start clearing
 104                  * slots after this message --anfl
 105                  */
 106                 if(!IsTGChange(source_p))
 107                 {
 108                         SetTGChange(source_p);
 109                         source_p->localClient->target_last = rb_current_time();
 110                 }
 111                 /* clear as many targets as we can */
 112                 else if((i = (rb_current_time() - source_p->localClient->target_last) / 60))
 113                 {
 114                         if(i + source_p->localClient->targets_free > TGCHANGE_NUM)
 115                                 source_p->localClient->targets_free = TGCHANGE_NUM;
 116                         else
 117                                 source_p->localClient->targets_free += i;
 118
 119                         source_p->localClient->target_last = rb_current_time();
 120                 }
 121                 /* cant clear any, full target list */
 122                 else if(source_p->localClient->targets_free == 0)
 123                 {
 124                         ServerStats.is_tgch++;
 125                         add_tgchange(source_p->sockhost);
 126
 127                         if (!IsTGExcessive(source_p))
 128                         {
 129                                 SetTGExcessive(source_p);
 130                                 /* This is sent to L_ALL because it's regenerated on all servers
 131                                  * that have the TGINFO module loaded.
 132                                  */
 133                                 sendto_realops_snomask(SNO_BOTS, L_ALL,
 134                                         "Excessive target change from %s (%s@%s)",
 135                                         source_p->name, source_p->username,
 136                                         source_p->orighost);
 137                         }
 138
 139                         sendto_match_servs(source_p, "*", CAP_ENCAP, NOCAPS,
 140                                 "ENCAP * TGINFO 0");
 141
 142                         return 0;
 143                 }
 144         }
 145         /* no targets in use, reset their target_last so that they cant
 146          * abuse a long idle to get targets back more quickly
 147          */
 148         else
 149         {
 150                 source_p->localClient->target_last = rb_current_time();
 151                 SetTGChange(source_p);
 152         }
 153
 154         for(i = TGCHANGE_NUM + TGCHANGE_REPLY - 1; i > 0; i--)
 155                 targets[i] = targets[i - 1];
 156         targets[0] = hashv;
 157         source_p->localClient->targets_free--;
 158         return 1;
 159 }
 160
 161 void
 162 add_reply_target(struct Client *source_p, struct Client *target_p)
 163 {
 164         int i, j;
 165         uint32_t hashv;
 166         uint32_t *targets;
 167
 168         /* can msg themselves or services without using any target slots */
 169         if(source_p == target_p || IsService(target_p))
 170                 return;
 171
 172         hashv = fnv_hash_upper((const unsigned char *)use_id(target_p), 32);
 173         targets = source_p->localClient->targets;
 174
 175         /* check for existing target, and move it to the first reply slot
 176          * if it is in a reply slot
 177          */
 178         for(i = 0; i < TGCHANGE_NUM + TGCHANGE_REPLY; i++)
 179         {
 180                 if(targets[i] == hashv)
 181                 {
 182                         if(i > TGCHANGE_NUM)
 183                         {
 184                                 for(j = i; j > TGCHANGE_NUM; j--)
 185                                         targets[j] = targets[j - 1];
 186                                 targets[TGCHANGE_NUM] = hashv;
 187                         }
 188                         return;
 189                 }
 190         }
 191         for(i = TGCHANGE_NUM + TGCHANGE_REPLY - 1; i > TGCHANGE_NUM; i--)
 192                 targets[i] = targets[i - 1];
 193         targets[TGCHANGE_NUM] = hashv;
 194 }