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
  25 #include "stdinc.h"
  26
  27 #include "whowas.h"
  28 #include "client.h"
  29 #include "common.h"
  30 #include "hash.h"
  31 #include "irc_string.h"
  32 #include "ircd.h"
  33 #include "ircd_defs.h"
  34 #include "numeric.h"
  35 #include "s_serv.h"
  36 #include "s_user.h"
  37 #include "send.h"
  38 #include "s_conf.h"
  39 #include "memory.h"
  40
  41 /* internally defined function */
  42 static void add_whowas_to_clist(struct Whowas **, struct Whowas *);
  43 static void del_whowas_from_clist(struct Whowas **, struct Whowas *);
  44 static void add_whowas_to_list(struct Whowas **, struct Whowas *);
  45 static void del_whowas_from_list(struct Whowas **, struct Whowas *);
  46
  47 struct Whowas WHOWAS[NICKNAMEHISTORYLENGTH];
  48 struct Whowas *WHOWASHASH[WW_MAX];
  49
  50 static int whowas_next = 0;
  51
  52 unsigned int hash_whowas_name(const char *name)
  53 {
  54         return fnv_hash_upper((const unsigned char *) name, WW_MAX_BITS);
  55 }
  56
  57 void add_history(struct Client *client_p, int online)
  58 {
  59         struct Whowas *who = &WHOWAS[whowas_next];
  60
  61         s_assert(NULL != client_p);
  62
  63         if(client_p == NULL)
  64                 return;
  65
  66         if(who->hashv != -1)
  67         {
  68                 if(who->online)
  69                         del_whowas_from_clist(&(who->online->whowas), who);
  70                 del_whowas_from_list(&WHOWASHASH[who->hashv], who);
  71         }
  72         who->hashv = hash_whowas_name(client_p->name);
  73         who->logoff = CurrentTime;
  74         /*
  75          * NOTE: strcpy ok here, the sizes in the client struct MUST
  76          * match the sizes in the whowas struct
  77          */
  78         strlcpy(who->name, client_p->name, sizeof(who->name));
  79         strcpy(who->username, client_p->username);
  80         strcpy(who->hostname, client_p->host);
  81         strcpy(who->realname, client_p->info);
  82         if (!EmptyString(client_p->sockhost) && strcmp(client_p->sockhost, "0") && show_ip(NULL, client_p))
  83                 strcpy(who->sockhost, client_p->sockhost);
  84         else
  85                 who->sockhost[0] = '\0';
  86
  87         who->servername = client_p->user->server;
  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 off_history(struct Client *client_p)
 103 {
 104         struct Whowas *temp, *next;
 105
 106         for (temp = client_p->whowas; temp; temp = next)
 107         {
 108                 next = temp->cnext;
 109                 temp->online = NULL;
 110                 del_whowas_from_clist(&(client_p->whowas), temp);
 111         }
 112 }
 113
 114 struct Client *get_history(const char *nick, time_t timelimit)
 115 {
 116         struct Whowas *temp;
 117         int blah;
 118
 119         timelimit = CurrentTime - timelimit;
 120         blah = hash_whowas_name(nick);
 121         temp = WHOWASHASH[blah];
 122         for (; temp; temp = temp->next)
 123         {
 124                 if(irccmp(nick, temp->name))
 125                         continue;
 126                 if(temp->logoff < timelimit)
 127                         continue;
 128                 return temp->online;
 129         }
 130         return NULL;
 131 }
 132
 133 void count_whowas_memory(size_t * wwu, size_t * wwum)
 134 {
 135         struct Whowas *tmp;
 136         int i;
 137         size_t u = 0;
 138         size_t um = 0;
 139
 140         /* count the number of used whowas structs in 'u' */
 141         /* count up the memory used of whowas structs in um */
 142
 143         for (i = 0, tmp = &WHOWAS[0]; i < NICKNAMEHISTORYLENGTH; i++, tmp++)
 144                 if(tmp->hashv != -1)
 145                 {
 146                         u++;
 147                         um += sizeof(struct Whowas);
 148                 }
 149         *wwu = u;
 150         *wwum = um;
 151         return;
 152 }
 153
 154 void
 155 initwhowas()
 156 {
 157         int i;
 158
 159         for (i = 0; i < NICKNAMEHISTORYLENGTH; i++)
 160         {
 161                 memset((void *) &WHOWAS[i], 0, sizeof(struct Whowas));
 162                 WHOWAS[i].hashv = -1;
 163         }
 164         for (i = 0; i < WW_MAX; i++)
 165                 WHOWASHASH[i] = NULL;
 166 }
 167
 168
 169 static void
 170 add_whowas_to_clist(struct Whowas **bucket, struct Whowas *whowas)
 171 {
 172         whowas->cprev = NULL;
 173         if((whowas->cnext = *bucket) != NULL)
 174                 whowas->cnext->cprev = whowas;
 175         *bucket = whowas;
 176 }
 177
 178 static void
 179 del_whowas_from_clist(struct Whowas **bucket, struct Whowas *whowas)
 180 {
 181         if(whowas->cprev)
 182                 whowas->cprev->cnext = whowas->cnext;
 183         else
 184                 *bucket = whowas->cnext;
 185         if(whowas->cnext)
 186                 whowas->cnext->cprev = whowas->cprev;
 187 }
 188
 189 static void
 190 add_whowas_to_list(struct Whowas **bucket, struct Whowas *whowas)
 191 {
 192         whowas->prev = NULL;
 193         if((whowas->next = *bucket) != NULL)
 194                 whowas->next->prev = whowas;
 195         *bucket = whowas;
 196 }
 197
 198 static void
 199 del_whowas_from_list(struct Whowas **bucket, struct Whowas *whowas)
 200 {
 201         if(whowas->prev)
 202                 whowas->prev->next = whowas->next;
 203         else
 204                 *bucket = whowas->next;
 205         if(whowas->next)
 206                 whowas->next->prev = whowas->prev;
 207 }