modules/m_ison.c

   1 /*
   2  *  ircd-ratbox: A slightly useful ircd.
   3  *  m_ison.c: Provides a single line answer of whether a user is online.
   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 #include "client.h"
  27 #include "match.h"
  28 #include "ircd.h"
  29 #include "numeric.h"
  30 #include "send.h"
  31 #include "msg.h"
  32 #include "parse.h"
  33 #include "modules.h"
  34 #include "s_conf.h"             /* ConfigFileEntry */
  35 #include "s_serv.h"             /* uplink/IsCapable */
  36 #include "hash.h"
  37
  38 #include <string.h>
  39
  40 static const char ison_desc[] = "Provides the ISON command to check if a set of users is online";
  41
  42 static void m_ison(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  43
  44 struct Message ison_msgtab = {
  45         "ISON", 0, 0, 0, 0,
  46         {mg_unreg, {m_ison, 2}, mg_ignore, mg_ignore, mg_ignore, {m_ison, 2}}
  47 };
  48
  49 mapi_clist_av1 ison_clist[] = { &ison_msgtab, NULL };
  50
  51 DECLARE_MODULE_AV2(ison, NULL, NULL, ison_clist, NULL, NULL, NULL, NULL, ison_desc);
  52
  53 static char buf[BUFSIZE];
  54 static char buf2[BUFSIZE];
  55
  56
  57 /*
  58  * m_ison added by Darren Reed 13/8/91 to act as an efficent user indicator
  59  * with respect to cpu/bandwidth used. Implemented for NOTIFY feature in
  60  * clients. Designed to reduce number of whois requests. Can process
  61  * nicknames in batches as long as the maximum buffer length.
  62  *
  63  * format:
  64  * ISON :nicklist
  65  */
  66 static void
  67 m_ison(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  68 {
  69         struct Client *target_p;
  70         char *nick;
  71         char *p;
  72         char *current_insert_point, *current_insert_point2;
  73         int len;
  74         int i;
  75         int done = 0;
  76
  77         current_insert_point2 = buf2;
  78         *buf2 = '\0';
  79
  80         sprintf(buf, form_str(RPL_ISON), me.name, source_p->name);
  81         len = strlen(buf);
  82         current_insert_point = buf + len;
  83
  84         /* rfc1459 is ambigious about how to handle ISON
  85          * this should handle both interpretations.
  86          */
  87         for (i = 1; i < parc; i++)
  88         {
  89                 char *cs = LOCAL_COPY(parv[i]);
  90                 for (nick = rb_strtok_r(cs, " ", &p); nick; nick = rb_strtok_r(NULL, " ", &p))
  91                 {
  92                         target_p = find_named_person(nick);
  93
  94                         if(target_p != NULL)
  95                         {
  96                                 len = strlen(target_p->name);
  97                                 if((current_insert_point + (len + 5)) < (buf + sizeof(buf)))
  98                                 {
  99                                         memcpy((void *) current_insert_point,
 100                                                (void *) target_p->name, len);
 101                                         current_insert_point += len;
 102                                         *current_insert_point++ = ' ';
 103                                 }
 104                                 else
 105                                 {
 106                                         done = 1;
 107                                         break;
 108                                 }
 109                         }
 110                 }
 111                 if(done)
 112                         break;
 113         }
 114
 115         /*  current_insert_point--;
 116          *  Do NOT take out the trailing space, it breaks ircII
 117          *  --Rodder */
 118
 119         *current_insert_point = '\0';
 120         *current_insert_point2 = '\0';
 121
 122         sendto_one(source_p, "%s", buf);
 123 }