ircd/m_pseudo.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/m_pseudo.c
   3  * Copyright (C) 2002 - 2003 Zoot <zoot@gamesurge.net>
   4  *
   5  * See file AUTHORS in IRC package for additional names of
   6  * the programmers.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 1, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  * $Id: m_pseudo.c,v 1.2 2004/12/11 05:13:48 klmitch Exp $
  23  */
  24
  25 /*
  26  * m_functions execute protocol messages on this server:
  27  *
  28  *    cptr    is always NON-NULL, pointing to a *LOCAL* client
  29  *            structure (with an open socket connected!). This
  30  *            identifies the physical socket where the message
  31  *            originated (or which caused the m_function to be
  32  *            executed--some m_functions may call others...).
  33  *
  34  *    sptr    is the source of the message, defined by the
  35  *            prefix part of the message if present. If not
  36  *            or prefix not found, then sptr==cptr.
  37  *
  38  *            (!IsServer(cptr)) => (cptr == sptr), because
  39  *            prefixes are taken *only* from servers...
  40  *
  41  *            (IsServer(cptr))
  42  *                    (sptr == cptr) => the message didn't
  43  *                    have the prefix.
  44  *
  45  *                    (sptr != cptr && IsServer(sptr) means
  46  *                    the prefix specified servername. (?)
  47  *
  48  *                    (sptr != cptr && !IsServer(sptr) means
  49  *                    that message originated from a remote
  50  *                    user (not local).
  51  *
  52  *            combining
  53  *
  54  *            (!IsServer(sptr)) means that, sptr can safely
  55  *            taken as defining the target structure of the
  56  *            message in this server.
  57  *
  58  *    *Always* true (if 'parse' and others are working correct):
  59  *
  60  *    1)      sptr->from == cptr  (note: cptr->from == cptr)
  61  *
  62  *    2)      MyConnect(sptr) <=> sptr == cptr (e.g. sptr
  63  *            *cannot* be a local connection, unless it's
  64  *            actually cptr!). [MyConnect(x) should probably
  65  *            be defined as (x == x->from) --msa ]
  66  *
  67  *    parc    number of variable parameter strings (if zero,
  68  *            parv is allowed to be NULL)
  69  *
  70  *    parv    a NULL terminated list of parameter pointers,
  71  *
  72  *                    parv[0], sender (prefix string), if not present
  73  *                            this points to an empty string.
  74  *                    parv[1], pointer to "extra" data (service mapping)
  75  *                    parv[2]...parv[parc-1]
  76  *                            pointers to additional parameters
  77  *                    parv[parc] == NULL, *always*
  78  *
  79  *            note:   it is guaranteed that parv[0]..parv[parc-1] are all
  80  *                    non-NULL pointers.
  81  */
  82 #include "config.h"
  83
  84 #include "client.h"
  85 #include "hash.h"
  86 #include "ircd.h"
  87 #include "ircd_features.h"
  88 #include "ircd_log.h"
  89 #include "ircd_relay.h"
  90 #include "ircd_reply.h"
  91 #include "ircd_string.h"
  92 #include "ircd_snprintf.h"
  93 #include "msg.h"
  94 #include "numeric.h"
  95 #include "numnicks.h"
  96 #include "s_conf.h"
  97 #include "s_user.h"
  98
  99 /* #include <assert.h> -- Now using assert in ircd_log.h */
 100
 101 /*
 102  * m_pseudo - generic service message handler
 103  *
 104  * parv[0] = sender prefix
 105  * parv[1] = service mapping (s_map * disguised as char *)
 106  * parv[2] = message
 107  */
 108 int m_pseudo(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 109 {
 110   char *text, buffer[BUFSIZE];
 111   struct s_map *map;
 112   struct nick_host *nh;
 113
 114   assert(0 != cptr);
 115   assert(cptr == sptr);
 116   assert(0 != cli_user(sptr));
 117
 118   /* By default, relay the message straight through. */
 119   text = parv[parc - 1];
 120
 121   if (parc < 3 || EmptyString(text))
 122     return send_reply(sptr, ERR_NOTEXTTOSEND);
 123
 124   /* HACK! HACK! HACK! HACK! Yes. It's icky, but
 125    * it's the only way. */
 126   map = (struct s_map *)parv[1];
 127   assert(0 != map);
 128
 129   if (map->prepend) {
 130     ircd_snprintf(0, buffer, sizeof(buffer) - 1, "%s%s", map->prepend, text);
 131     buffer[sizeof(buffer) - 1] = 0;
 132     text = buffer;
 133   }
 134
 135   for (nh = map->services; nh; nh = nh->next) {
 136     struct Client *target, *server;
 137
 138     if (NULL == (server = FindServer(nh->nick + nh->nicklen + 1)))
 139       continue;
 140     nh->nick[nh->nicklen] = '\0';
 141     if ((NULL == (target = FindUser(nh->nick)))
 142         || (server != cli_user(target)->server))
 143       continue;
 144     nh->nick[nh->nicklen] = '@';
 145     relay_directed_message(sptr, nh->nick, nh->nick + nh->nicklen, text);
 146     return 0;
 147   }
 148
 149   return send_reply(sptr, ERR_SERVICESDOWN, map->name);
 150 }