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 21128 2005-11-08 20:41:20Z leeh $
  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 "irc_string.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 "memory.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
  55 hash_whowas_name(const char *name)
  56 {
  57         return fnv_hash_upper((const unsigned char *) name, WW_MAX_BITS);
  58 }
  59
  60 void
  61 add_history(struct Client *client_p, int online)
  62 {
  63         struct Whowas *who = &WHOWAS[whowas_next];
  64
  65         s_assert(NULL != client_p);
  66
  67         if(client_p == NULL)
  68                 return;
  69
  70         if(who->hashv != -1)
  71         {
  72                 if(who->online)
  73                         del_whowas_from_clist(&(who->online->whowas), who);
  74                 del_whowas_from_list(&WHOWASHASH[who->hashv], who);
  75         }
  76         who->hashv = hash_whowas_name(client_p->name);
  77         who->logoff = CurrentTime;
  78         /*
  79          * NOTE: strcpy ok here, the sizes in the client struct MUST
  80          * match the sizes in the whowas struct
  81          */
  82         strlcpy(who->name, client_p->name, sizeof(who->name));
  83         strcpy(who->username, client_p->username);
  84         strcpy(who->hostname, client_p->host);
  85         strcpy(who->realname, client_p->info);
  86
  87         who->servername = client_p->servptr->name;
  88
  89         if(online)
  90         {
  91                 who->online = client_p;
  92                 add_whowas_to_clist(&(client_p->whowas), who);
  93         }
  94         else
  95                 who->online = NULL;
  96         add_whowas_to_list(&WHOWASHASH[who->hashv], who);
  97         whowas_next++;
  98         if(whowas_next == NICKNAMEHISTORYLENGTH)
  99                 whowas_next = 0;
 100 }
 101
 102 void
 103 off_history(struct Client *client_p)
 104 {
 105         struct Whowas *temp, *next;
 106
 107         for (temp = client_p->whowas; temp; temp = next)
 108         {
 109                 next = temp->cnext;
 110                 temp->online = NULL;
 111                 del_whowas_from_clist(&(client_p->whowas), temp);
 112         }
 113 }
 114
 115 struct Client *
 116 get_history(const char *nick, time_t timelimit)
 117 {
 118         struct Whowas *temp;
 119         int blah;
 120
 121         timelimit = CurrentTime - 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
 136 count_whowas_memory(size_t * wwu, size_t * wwum)
 137 {
 138         struct Whowas *tmp;
 139         int i;
 140         size_t u = 0;
 141         size_t um = 0;
 142
 143         /* count the number of used whowas structs in 'u' */
 144         /* count up the memory used of whowas structs in um */
 145
 146         for (i = 0, tmp = &WHOWAS[0]; i < NICKNAMEHISTORYLENGTH; i++, tmp++)
 147                 if(tmp->hashv != -1)
 148                 {
 149                         u++;
 150                         um += sizeof(struct Whowas);
 151                 }
 152         *wwu = u;
 153         *wwum = um;
 154         return;
 155 }
 156
 157 void
 158 initwhowas()
 159 {
 160         int i;
 161
 162         for (i = 0; i < NICKNAMEHISTORYLENGTH; i++)
 163         {
 164                 memset((void *) &WHOWAS[i], 0, sizeof(struct Whowas));
 165                 WHOWAS[i].hashv = -1;
 166         }
 167         for (i = 0; i < WW_MAX; i++)
 168                 WHOWASHASH[i] = NULL;
 169 }
 170
 171
 172 static void
 173 add_whowas_to_clist(struct Whowas **bucket, struct Whowas *whowas)
 174 {
 175         whowas->cprev = NULL;
 176         if((whowas->cnext = *bucket) != NULL)
 177                 whowas->cnext->cprev = whowas;
 178         *bucket = whowas;
 179 }
 180
 181 static void
 182 del_whowas_from_clist(struct Whowas **bucket, struct Whowas *whowas)
 183 {
 184         if(whowas->cprev)
 185                 whowas->cprev->cnext = whowas->cnext;
 186         else
 187                 *bucket = whowas->cnext;
 188         if(whowas->cnext)
 189                 whowas->cnext->cprev = whowas->cprev;
 190 }
 191
 192 static void
 193 add_whowas_to_list(struct Whowas **bucket, struct Whowas *whowas)
 194 {
 195         whowas->prev = NULL;
 196         if((whowas->next = *bucket) != NULL)
 197                 whowas->next->prev = whowas;
 198         *bucket = whowas;
 199 }
 200
 201 static void
 202 del_whowas_from_list(struct Whowas **bucket, struct Whowas *whowas)
 203 {
 204         if(whowas->prev)
 205                 whowas->prev->next = whowas->next;
 206         else
 207                 *bucket = whowas->next;
 208         if(whowas->next)
 209                 whowas->next->prev = whowas->prev;
 210 }