modules/m_capab.c

   1 /*
   2  *  ircd-ratbox: A slightly useful ircd.
   3  *  m_capab.c: Negotiates capabilities with a remote server.
   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 "s_serv.h"
  29 #include "s_conf.h"
  30 #include "msg.h"
  31 #include "parse.h"
  32 #include "modules.h"
  33
  34 static const char capab_desc[] = "Provides the commands used for server-to-server capability negotiation";
  35
  36 static void mr_capab(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  37 static void me_gcap(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  38
  39 struct Message capab_msgtab = {
  40         "CAPAB", 0, 0, 0, 0,
  41         {{mr_capab, 2}, mg_ignore, mg_ignore, mg_ignore, mg_ignore, mg_ignore}
  42 };
  43 struct Message gcap_msgtab = {
  44         "GCAP", 0, 0, 0, 0,
  45         {mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_gcap, 2}, mg_ignore}
  46 };
  47
  48 mapi_clist_av1 capab_clist[] = { &capab_msgtab, &gcap_msgtab, NULL };
  49
  50 DECLARE_MODULE_AV2(capab, NULL, NULL, capab_clist, NULL, NULL, NULL, NULL, capab_desc);
  51
  52 /*
  53  * mr_capab - CAPAB message handler
  54  *      parv[1] = space-separated list of capabilities
  55  */
  56 static void
  57 mr_capab(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  58 {
  59         int i;
  60         char *p;
  61         char *s;
  62
  63         /* ummm, this shouldn't happen. Could argue this should be logged etc. */
  64         if(client_p->localClient == NULL)
  65                 return;
  66
  67         if(client_p->user)
  68                 return;
  69
  70         /* CAP_TS6 is set in PASS, so is valid.. */
  71         if((client_p->localClient->caps & ~CAP_TS6) != 0)
  72         {
  73                 exit_client(client_p, client_p, client_p, "CAPAB received twice");
  74                 return;
  75         }
  76         else
  77                 client_p->localClient->caps |= CAP_CAP;
  78
  79         rb_free(client_p->localClient->fullcaps);
  80         client_p->localClient->fullcaps = rb_strdup(parv[1]);
  81
  82         for (i = 1; i < parc; i++)
  83         {
  84                 char *t = LOCAL_COPY(parv[i]);
  85                 for (s = rb_strtok_r(t, " ", &p); s; s = rb_strtok_r(NULL, " ", &p))
  86                         client_p->localClient->caps |= capability_get(serv_capindex, s, NULL);
  87         }
  88 }
  89
  90 static void
  91 me_gcap(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p,
  92                 int parc, const char *parv[])
  93 {
  94         char *t = LOCAL_COPY(parv[1]);
  95         char *s;
  96         char *p;
  97
  98         if(!IsServer(source_p))
  99                 return;
 100
 101         /* already had GCAPAB?! */
 102         if(!EmptyString(source_p->serv->fullcaps))
 103         {
 104                 source_p->serv->caps = 0;
 105                 rb_free(source_p->serv->fullcaps);
 106         }
 107
 108         source_p->serv->fullcaps = rb_strdup(parv[1]);
 109
 110         for (s = rb_strtok_r(t, " ", &p); s; s = rb_strtok_r(NULL, " ", &p))
 111                 source_p->serv->caps |= capability_get(serv_capindex, s, NULL);
 112 }