src/whowas.c

   1 /*
   2  *  ircd-ratbox: A slightly useful ircd.
   3  *  whowas.c: WHOWAS user cache.
   4  *
   5  *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
   6  *  Copyright (C) 1996-2002 Hybrid Development Team
   7  *  Copyright (C) 2002-2005 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  *  $Id: whowas.c 1717 2006-07-04 14:41:11Z jilles $
  25  */
  26
  27 #include "stdinc.h"
  28
  29 #include "whowas.h"
  30 #include "client.h"
  31 #include "common.h"
  32 #include "hash.h"
  33 #include "match.h"
  34 #include "ircd.h"
  35 #include "ircd_defs.h"
  36 #include "numeric.h"
  37 #include "s_serv.h"
  38 #include "s_user.h"
  39 #include "send.h"
  40 #include "s_conf.h"
  41 #include "scache.h"
  42
  43 /* internally defined function */
  44 static void add_whowas_to_clist(struct Whowas **, struct Whowas *);
  45 static void del_whowas_from_clist(struct Whowas **, struct Whowas *);
  46 static void add_whowas_to_list(struct Whowas **, struct Whowas *);
  47 static void del_whowas_from_list(struct Whowas **, struct Whowas *);
  48
  49 struct Whowas WHOWAS[NICKNAMEHISTORYLENGTH];
  50 struct Whowas *WHOWASHASH[WW_MAX];
  51
  52 static int whowas_next = 0;
  53
  54 unsigned int hash_whowas_name(const char *name)
  55 {
  56         return fnv_hash_upper((const unsigned char *) name, WW_MAX_BITS);
  57 }
  58
  59 void add_history(struct Client *client_p, int online)
  60 {
  61         struct Whowas *who = &WHOWAS[whowas_next];
  62
  63         s_assert(NULL != client_p);
  64
  65         if(client_p == NULL)
  66                 return;
  67
  68         if(who->hashv != -1)
  69         {
  70                 if(who->online)
  71                         del_whowas_from_clist(&(who->online->whowas), who);
  72                 del_whowas_from_list(&WHOWASHASH[who->hashv], who);
  73         }
  74         who->hashv = hash_whowas_name(client_p->name);
  75         who->logoff = rb_current_time();
  76         /*
  77          * NOTE: strcpy ok here, the sizes in the client struct MUST
  78          * match the sizes in the whowas struct
  79          */
  80         rb_strlcpy(who->name, client_p->name, sizeof(who->name));
  81         strcpy(who->username, client_p->username);
  82         strcpy(who->hostname, client_p->host);
  83         strcpy(who->realname, client_p->info);
  84         if (!EmptyString(client_p->sockhost) && strcmp(client_p->sockhost, "0") && show_ip(NULL, client_p))
  85                 strcpy(who->sockhost, client_p->sockhost);
  86         else
  87                 who->sockhost[0] = '\0';
  88
  89         who->servername = scache_get_name(client_p->servptr->serv->nameinfo);
  90
  91         if(online)
  92         {
  93                 who->online = client_p;
  94                 add_whowas_to_clist(&(client_p->whowas), who);
  95         }
  96         else
  97                 who->online = NULL;
  98         add_whowas_to_list(&WHOWASHASH[who->hashv], who);
  99         whowas_next++;
 100         if(whowas_next == NICKNAMEHISTORYLENGTH)
 101                 whowas_next = 0;
 102 }
 103
 104 void off_history(struct Client *client_p)
 105 {
 106         struct Whowas *temp, *next;
 107
 108         for (temp = client_p->whowas; temp; temp = next)
 109         {
 110                 next = temp->cnext;
 111                 temp->online = NULL;
 112                 del_whowas_from_clist(&(client_p->whowas), temp);
 113         }
 114 }
 115
 116 struct Client *get_history(const char *nick, time_t timelimit)
 117 {
 118         struct Whowas *temp;
 119         int blah;
 120
 121         timelimit = rb_current_time() - timelimit;
 122         blah = hash_whowas_name(nick);
 123         temp = WHOWASHASH[blah];
 124         for (; temp; temp = temp->next)
 125         {
 126                 if(irccmp(nick, temp->name))
 127                         continue;
 128                 if(temp->logoff < timelimit)
 129                         continue;
 130                 return temp->online;
 131         }
 132         return NULL;
 133 }
 134
 135 void count_whowas_memory(size_t * wwu, size_t * wwum)
 136 {
 137         *wwu = NICKNAMEHISTORYLENGTH;
 138         *wwum = NICKNAMEHISTORYLENGTH * sizeof(struct Whowas);
 139 }
 140
 141 void
 142 initwhowas()
 143 {
 144         int i;
 145
 146         for (i = 0; i < NICKNAMEHISTORYLENGTH; i++)
 147         {
 148                 memset((void *) &WHOWAS[i], 0, sizeof(struct Whowas));
 149                 WHOWAS[i].hashv = -1;
 150         }
 151         for (i = 0; i < WW_MAX; i++)
 152                 WHOWASHASH[i] = NULL;
 153 }
 154
 155
 156 static void
 157 add_whowas_to_clist(struct Whowas **bucket, struct Whowas *whowas)
 158 {
 159         whowas->cprev = NULL;
 160         if((whowas->cnext = *bucket) != NULL)
 161                 whowas->cnext->cprev = whowas;
 162         *bucket = whowas;
 163 }
 164
 165 static void
 166 del_whowas_from_clist(struct Whowas **bucket, struct Whowas *whowas)
 167 {
 168         if(whowas->cprev)
 169                 whowas->cprev->cnext = whowas->cnext;
 170         else
 171                 *bucket = whowas->cnext;
 172         if(whowas->cnext)
 173                 whowas->cnext->cprev = whowas->cprev;
 174 }
 175
 176 static void
 177 add_whowas_to_list(struct Whowas **bucket, struct Whowas *whowas)
 178 {
 179         whowas->prev = NULL;
 180         if((whowas->next = *bucket) != NULL)
 181                 whowas->next->prev = whowas;
 182         *bucket = whowas;
 183 }
 184
 185 static void
 186 del_whowas_from_list(struct Whowas **bucket, struct Whowas *whowas)
 187 {
 188         if(whowas->prev)
 189                 whowas->prev->next = whowas->next;
 190         else
 191                 *bucket = whowas->next;
 192         if(whowas->next)
 193                 whowas->next->prev = whowas->prev;
 194 }