ircd/m_invite.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/m_invite.c
   3  * Copyright (C) 1990 Jarkko Oikarinen and
   4  *                    University of Oulu, Computing Center
   5  *
   6  * See file AUTHORS in IRC package for additional names of
   7  * the programmers.
   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 1, or (at your option)
  12  * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * $Id: m_invite.c,v 1.25 2005/09/13 15:17:46 entrope Exp $
  24  */
  25
  26 /*
  27  * m_functions execute protocol messages on this server:
  28  *
  29  *    cptr    is always NON-NULL, pointing to a *LOCAL* client
  30  *            structure (with an open socket connected!). This
  31  *            identifies the physical socket where the message
  32  *            originated (or which caused the m_function to be
  33  *            executed--some m_functions may call others...).
  34  *
  35  *    sptr    is the source of the message, defined by the
  36  *            prefix part of the message if present. If not
  37  *            or prefix not found, then sptr==cptr.
  38  *
  39  *            (!IsServer(cptr)) => (cptr == sptr), because
  40  *            prefixes are taken *only* from servers...
  41  *
  42  *            (IsServer(cptr))
  43  *                    (sptr == cptr) => the message didn't
  44  *                    have the prefix.
  45  *
  46  *                    (sptr != cptr && IsServer(sptr) means
  47  *                    the prefix specified servername. (?)
  48  *
  49  *                    (sptr != cptr && !IsServer(sptr) means
  50  *                    that message originated from a remote
  51  *                    user (not local).
  52  *
  53  *            combining
  54  *
  55  *            (!IsServer(sptr)) means that, sptr can safely
  56  *            taken as defining the target structure of the
  57  *            message in this server.
  58  *
  59  *    *Always* true (if 'parse' and others are working correct):
  60  *
  61  *    1)      sptr->from == cptr  (note: cptr->from == cptr)
  62  *
  63  *    2)      MyConnect(sptr) <=> sptr == cptr (e.g. sptr
  64  *            *cannot* be a local connection, unless it's
  65  *            actually cptr!). [MyConnect(x) should probably
  66  *            be defined as (x == x->from) --msa ]
  67  *
  68  *    parc    number of variable parameter strings (if zero,
  69  *            parv is allowed to be NULL)
  70  *
  71  *    parv    a NULL terminated list of parameter pointers,
  72  *
  73  *                    parv[0], sender (prefix string), if not present
  74  *                            this points to an empty string.
  75  *                    parv[1]...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 "channel.h"
  85 #include "client.h"
  86 #include "hash.h"
  87 #include "ircd.h"
  88 #include "ircd_features.h"
  89 #include "ircd_log.h"
  90 #include "ircd_reply.h"
  91 #include "ircd_string.h"
  92 #include "list.h"
  93 #include "msg.h"
  94 #include "numeric.h"
  95 #include "numnicks.h"
  96 #include "s_user.h"
  97 #include "send.h"
  98 #include "struct.h"
  99
 100 /* #include <assert.h> -- Now using assert in ircd_log.h */
 101
 102 /*
 103  * m_invite - generic message handler
 104  *
 105  *   parv[0] - sender prefix
 106  *   parv[1] - user to invite
 107  *   parv[2] - channel name
 108  *
 109  * - INVITE now is accepted only if who does it is chanop (this of course
 110  *   implies that channel must exist and he must be on it).
 111  *
 112  * - On the other side it IS processed even if channel is NOT invite only
 113  *   leaving room for other enhancements like inviting banned ppl.  -- Nemesi
 114  *
 115  * - Invite with no parameters now lists the channels you are invited to.
 116  *                                                         - Isomer 23 Oct 99
 117  */
 118 int m_invite(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 119 {
 120   struct Client *acptr;
 121   struct Channel *chptr;
 122
 123   if (parc < 2 ) {
 124     /*
 125      * list the channels you have an invite to.
 126      */
 127     struct SLink *lp;
 128     for (lp = cli_user(sptr)->invited; lp; lp = lp->next)
 129       send_reply(cptr, RPL_INVITELIST, lp->value.chptr->chname);
 130     send_reply(cptr, RPL_ENDOFINVITELIST);
 131     return 0;
 132   }
 133
 134   if (parc < 3 || EmptyString(parv[2]))
 135     return need_more_params(sptr, "INVITE");
 136
 137   if (!(acptr = FindUser(parv[1]))) {
 138     send_reply(sptr, ERR_NOSUCHNICK, parv[1]);
 139     return 0;
 140   }
 141
 142   if (is_silenced(sptr, acptr))
 143     return 0;
 144
 145   if (!IsChannelName(parv[2])
 146       || !strIsIrcCh(parv[2])
 147       || !(chptr = FindChannel(parv[2]))) {
 148     send_reply(sptr, ERR_NOSUCHCHANNEL, parv[2]);
 149     return 0;
 150   }
 151
 152   if (!find_channel_member(sptr, chptr)) {
 153     send_reply(sptr, ERR_NOTONCHANNEL, chptr->chname);
 154     return 0;
 155   }
 156
 157   if (find_channel_member(acptr, chptr)) {
 158     send_reply(sptr, ERR_USERONCHANNEL, cli_name(acptr), chptr->chname);
 159     return 0;
 160   }
 161
 162   if (!is_chan_op(sptr, chptr)) {
 163     send_reply(sptr, ERR_CHANOPRIVSNEEDED, chptr->chname);
 164     return 0;
 165   }
 166
 167   /* If we get here, it was a VALID and meaningful INVITE */
 168
 169   if (check_target_limit(sptr, acptr, cli_name(acptr), 0))
 170     return 0;
 171
 172   send_reply(sptr, RPL_INVITING, cli_name(acptr), chptr->chname);
 173
 174   if (cli_user(acptr)->away)
 175     send_reply(sptr, RPL_AWAY, cli_name(acptr), cli_user(acptr)->away);
 176
 177   if (MyConnect(acptr)) {
 178     add_invite(acptr, chptr);
 179     sendcmdto_one(sptr, CMD_INVITE, acptr, "%s %H", cli_name(acptr), chptr);
 180   } else if (!IsLocalChannel(chptr->chname)) {
 181     sendcmdto_one(sptr, CMD_INVITE, acptr, "%s %H %Tu", cli_name(acptr), chptr,
 182                   chptr->creationtime);
 183   }
 184
 185   if (!IsLocalChannel(chptr->chname) || MyConnect(acptr)) {
 186     if (feature_bool(FEAT_ANNOUNCE_INVITES)) {
 187       /* Announce to channel operators. */
 188       sendcmdto_channel_butserv_butone(&his, get_error_numeric(RPL_ISSUEDINVITE)->str,
 189                                        NULL, chptr, sptr, SKIP_NONOPS,
 190                                        "%H %C %C :%C has been invited by %C",
 191                                        chptr, acptr, sptr, acptr, sptr);
 192       /* Announce to servers with channel operators. */
 193       sendcmdto_channel_servers_butone(sptr, NULL, TOK_INVITE, chptr, acptr, SKIP_NONOPS,
 194                                        "%s %H %Tu", cli_name(acptr),
 195                                        chptr, chptr->creationtime);
 196     }
 197   }
 198
 199   return 0;
 200 }
 201
 202 /*
 203  * ms_invite - server message handler
 204  *
 205  *   parv[0] - sender prefix
 206  *   parv[1] - user to invite
 207  *   parv[2] - channel name
 208  *   parv[3] - (optional) channel timestamp
 209  *
 210  * - INVITE now is accepted only if who does it is chanop (this of course
 211  *   implies that channel must exist and he must be on it).
 212  *
 213  * - On the other side it IS processed even if channel is NOT invite only
 214  *   leaving room for other enhancements like inviting banned ppl.  -- Nemesi
 215  *
 216  * - Invite with no parameters now lists the channels you are invited to.
 217  *                                                         - Isomer 23 Oct 99
 218  *
 219  * - Invite with too-late timestamp, or with no timestamp from a bursting
 220  *   server, is silently discarded.                   - Entrope 19 Jan 05
 221  */
 222 int ms_invite(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 223 {
 224   struct Client *acptr;
 225   struct Channel *chptr;
 226   time_t invite_ts;
 227
 228   if (IsServer(sptr)) {
 229     /*
 230      * this will blow up if we get an invite from a server
 231      * we look for channel membership in sptr below.
 232      */
 233     return protocol_violation(sptr,"Server attempting to invite");
 234   }
 235   if (parc < 3 || EmptyString(parv[2])) {
 236     /*
 237      * should have been handled upstream, ignore it.
 238      */
 239     protocol_violation(sptr,"Too few arguments to invite");
 240     return need_more_params(sptr,"INVITE");
 241   }
 242   if (!IsGlobalChannel(parv[2])) {
 243     /*
 244      * should not be sent
 245      */
 246     return protocol_violation(sptr, "Invite to a non-standard channel %s",parv[2]);
 247   }
 248   if (!(acptr = FindUser(parv[1]))) {
 249     send_reply(sptr, ERR_NOSUCHNICK, parv[1]);
 250     return 0;
 251   }
 252
 253   if (!(chptr = FindChannel(parv[2]))) {
 254     /*
 255      * allow invites to non existent channels, bleah
 256      * avoid JOIN, INVITE, PART abuse
 257      */
 258     sendcmdto_one(sptr, CMD_INVITE, acptr, "%C :%s", acptr, parv[2]);
 259     return 0;
 260   }
 261
 262   if (parc > 3) {
 263     invite_ts = atoi(parv[3]);
 264     if (invite_ts > chptr->creationtime)
 265       return 0;
 266   } else if (IsBurstOrBurstAck(cptr))
 267     return 0;
 268
 269   if (!IsChannelService(sptr) && !find_channel_member(sptr, chptr)) {
 270     send_reply(sptr, ERR_NOTONCHANNEL, chptr->chname);
 271     return 0;
 272   }
 273
 274   if (find_channel_member(acptr, chptr)) {
 275     send_reply(sptr, ERR_USERONCHANNEL, cli_name(acptr), chptr->chname);
 276     return 0;
 277   }
 278
 279   if (is_silenced(sptr, acptr))
 280     return 0;
 281
 282   if (MyConnect(acptr)) {
 283     add_invite(acptr, chptr);
 284     sendcmdto_one(sptr, CMD_INVITE, acptr, "%s %H", cli_name(acptr), chptr);
 285   } else {
 286     sendcmdto_one(sptr, CMD_INVITE, acptr, "%s %H %Tu", cli_name(acptr), chptr,
 287                   chptr->creationtime);
 288   }
 289
 290   if (feature_bool(FEAT_ANNOUNCE_INVITES)) {
 291     /* Announce to channel operators. */
 292     sendcmdto_channel_butserv_butone(&his, get_error_numeric(RPL_ISSUEDINVITE)->str,
 293                                      NULL, chptr, sptr, SKIP_NONOPS,
 294                                      "%H %C %C :%C has been invited by %C",
 295                                      chptr, acptr, sptr, acptr, sptr);
 296     /* Announce to servers with channel operators. */
 297     sendcmdto_channel_servers_butone(sptr, NULL, TOK_INVITE, chptr, acptr, SKIP_NONOPS,
 298                                      "%s %H %Tu", cli_name(acptr), chptr,
 299                                      chptr->creationtime);
 300   }
 301
 302   return 0;
 303 }