src/monitor.c

   1 /*
   2  * ircd-ratbox: an advanced Internet Relay Chat Daemon(ircd).
   3  * monitor.c - Code for server-side notify lists
   4  *
   5  * Copyright (C) 2005 Lee Hardy <lee -at- leeh.co.uk>
   6  * Copyright (C) 2005 ircd-ratbox development team
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are
  10  * met:
  11  *
  12  * 1.Redistributions of source code must retain the above copyright notice,
  13  *   this list of conditions and the following disclaimer.
  14  * 2.Redistributions in binary form must reproduce the above copyright
  15  *   notice, this list of conditions and the following disclaimer in the
  16  *   documentation and/or other materials provided with the distribution.
  17  * 3.The name of the author may not be used to endorse or promote products
  18  *   derived from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  22  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  23  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  24  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  25  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  26  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  28  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  29  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * $Id: monitor.c 3520 2007-06-30 22:15:35Z jilles $
  33  */
  34 #include "stdinc.h"
  35 #include "tools.h"
  36 #include "client.h"
  37 #include "memory.h"
  38 #include "balloc.h"
  39 #include "monitor.h"
  40 #include "hash.h"
  41 #include "event.h"
  42 #include "numeric.h"
  43
  44 static struct monitor *monitorTable[MONITOR_HASH_SIZE];
  45 BlockHeap *monitor_heap;
  46
  47 static void cleanup_monitor(void *unused);
  48
  49 void
  50 init_monitor(void)
  51 {
  52         monitor_heap = BlockHeapCreate(sizeof(struct monitor), MONITOR_HEAP_SIZE);
  53         eventAddIsh("cleanup_monitor", cleanup_monitor, NULL, 3600);
  54 }
  55
  56 static inline unsigned int
  57 hash_monitor_nick(const char *name)
  58 {
  59         return fnv_hash_upper((const unsigned char *) name, MONITOR_HASH_BITS);
  60 }
  61
  62 struct monitor *
  63 find_monitor(const char *name, int add)
  64 {
  65         struct monitor *monptr;
  66
  67         unsigned int hashv = hash_monitor_nick(name);
  68
  69         for(monptr = monitorTable[hashv]; monptr; monptr = monptr->hnext)
  70         {
  71                 if(!irccmp(monptr->name, name))
  72                         return monptr;
  73         }
  74
  75         if(add)
  76         {
  77                 monptr = BlockHeapAlloc(monitor_heap);
  78                 strlcpy(monptr->name, name, sizeof(monptr->name));
  79
  80                 monptr->hnext = monitorTable[hashv];
  81                 monitorTable[hashv] = monptr;
  82
  83                 return monptr;
  84         }
  85
  86         return NULL;
  87 }
  88
  89 /* monitor_signon()
  90  *
  91  * inputs       - client who has just connected
  92  * outputs      -
  93  * side effects - notifies any clients monitoring this nickname that it has
  94  *                connected to the network
  95  */
  96 void
  97 monitor_signon(struct Client *client_p)
  98 {
  99         char buf[USERHOST_REPLYLEN];
 100         struct monitor *monptr = find_monitor(client_p->name, 0);
 101
 102         /* noones watching this nick */
 103         if(monptr == NULL)
 104                 return;
 105
 106         ircsnprintf(buf, sizeof(buf), "%s!%s@%s",
 107                     client_p->name, client_p->username, client_p->host);
 108
 109         sendto_monitor(monptr, form_str(RPL_MONONLINE), me.name, "*", buf);
 110 }
 111
 112 /* monitor_signoff()
 113  *
 114  * inputs       - client who is exiting
 115  * outputs      -
 116  * side effects - notifies any clients monitoring this nickname that it has
 117  *                left the network
 118  */
 119 void
 120 monitor_signoff(struct Client *client_p)
 121 {
 122         struct monitor *monptr = find_monitor(client_p->name, 0);
 123
 124         /* noones watching this nick */
 125         if(monptr == NULL)
 126                 return;
 127
 128         sendto_monitor(monptr, form_str(RPL_MONOFFLINE), me.name, "*",
 129                         client_p->name);
 130 }
 131
 132 void
 133 clear_monitor(struct Client *client_p)
 134 {
 135         struct monitor *monptr;
 136         dlink_node *ptr, *next_ptr;
 137
 138         DLINK_FOREACH_SAFE(ptr, next_ptr, client_p->localClient->monitor_list.head)
 139         {
 140                 monptr = ptr->data;
 141
 142                 /* we leave the actual entry around with no users, itll be
 143                  * cleaned up periodically by cleanup_monitor() --anfl
 144                  */
 145                 dlinkFindDestroy(client_p, &monptr->users);
 146                 free_dlink_node(ptr);
 147         }
 148
 149         client_p->localClient->monitor_list.head = client_p->localClient->monitor_list.tail = NULL;
 150         client_p->localClient->monitor_list.length = 0;
 151 }
 152
 153 static void
 154 cleanup_monitor(void *unused)
 155 {
 156         struct monitor *last_ptr = NULL;
 157         struct monitor *next_ptr, *ptr;
 158         int i;
 159
 160         for(i = 0; i < MONITOR_HASH_SIZE; i++)
 161         {
 162                 last_ptr = NULL;
 163                 for(ptr = monitorTable[i]; ptr; ptr = next_ptr)
 164                 {
 165                         next_ptr = ptr->hnext;
 166
 167                         if(!dlink_list_length(&ptr->users))
 168                         {
 169                                 if(last_ptr)
 170                                         last_ptr->hnext = next_ptr;
 171                                 else
 172                                         monitorTable[i] = next_ptr;
 173
 174                                 BlockHeapFree(monitor_heap, ptr);
 175                         }
 176                         else
 177                                 last_ptr = ptr;
 178                 }
 179         }
 180 }