ircd/m_clearmode.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/m_clearmode.c
   3  * Copyright (C) 1990 Jarkko Oikarinen and
   4  *                    University of Oulu, Computing Center
   5  * Copyright (C) 2000 Kevin L. Mitchell <klmitch@mit.edu>
   6  *
   7  * See file AUTHORS in IRC package for additional names of
   8  * the programmers.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 1, or (at your option)
  13  * any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  * $Id: m_clearmode.c,v 1.31 2005/09/27 02:41:57 entrope Exp $
  25  */
  26
  27 /*
  28  * m_functions execute protocol messages on this server:
  29  *
  30  *    cptr    is always NON-NULL, pointing to a *LOCAL* client
  31  *            structure (with an open socket connected!). This
  32  *            identifies the physical socket where the message
  33  *            originated (or which caused the m_function to be
  34  *            executed--some m_functions may call others...).
  35  *
  36  *    sptr    is the source of the message, defined by the
  37  *            prefix part of the message if present. If not
  38  *            or prefix not found, then sptr==cptr.
  39  *
  40  *            (!IsServer(cptr)) => (cptr == sptr), because
  41  *            prefixes are taken *only* from servers...
  42  *
  43  *            (IsServer(cptr))
  44  *                    (sptr == cptr) => the message didn't
  45  *                    have the prefix.
  46  *
  47  *                    (sptr != cptr && IsServer(sptr) means
  48  *                    the prefix specified servername. (?)
  49  *
  50  *                    (sptr != cptr && !IsServer(sptr) means
  51  *                    that message originated from a remote
  52  *                    user (not local).
  53  *
  54  *            combining
  55  *
  56  *            (!IsServer(sptr)) means that, sptr can safely
  57  *            taken as defining the target structure of the
  58  *            message in this server.
  59  *
  60  *    *Always* true (if 'parse' and others are working correct):
  61  *
  62  *    1)      sptr->from == cptr  (note: cptr->from == cptr)
  63  *
  64  *    2)      MyConnect(sptr) <=> sptr == cptr (e.g. sptr
  65  *            *cannot* be a local connection, unless it's
  66  *            actually cptr!). [MyConnect(x) should probably
  67  *            be defined as (x == x->from) --msa ]
  68  *
  69  *    parc    number of variable parameter strings (if zero,
  70  *            parv is allowed to be NULL)
  71  *
  72  *    parv    a NULL terminated list of parameter pointers,
  73  *
  74  *                    parv[0], sender (prefix string), if not present
  75  *                            this points to an empty string.
  76  *                    parv[1]...parv[parc-1]
  77  *                            pointers to additional parameters
  78  *                    parv[parc] == NULL, *always*
  79  *
  80  *            note:   it is guaranteed that parv[0]..parv[parc-1] are all
  81  *                    non-NULL pointers.
  82  */
  83 #include "config.h"
  84
  85 #include "client.h"
  86 #include "channel.h"
  87 #include "hash.h"
  88 #include "ircd.h"
  89 #include "ircd_alloc.h"
  90 #include "ircd_features.h"
  91 #include "ircd_log.h"
  92 #include "ircd_reply.h"
  93 #include "ircd_string.h"
  94 #include "list.h"
  95 #include "msg.h"
  96 #include "numeric.h"
  97 #include "numnicks.h"
  98 #include "s_conf.h"
  99 #include "send.h"
 100
 101 /* #include <assert.h> -- Now using assert in ircd_log.h */
 102
 103 /*
 104  * do_clearmode(struct Client *cptr, struct Client *sptr,
 105  *              struct Channel *chptr, char *control)
 106  *
 107  * This is the function that actually clears the channel modes.
 108  */
 109 static int
 110 do_clearmode(struct Client *cptr, struct Client *sptr, struct Channel *chptr,
 111              char *control)
 112 {
 113   static int flags[] = {
 114     MODE_CHANOP,        'o',
 115     MODE_VOICE,         'v',
 116     MODE_PRIVATE,       'p',
 117     MODE_SECRET,        's',
 118     MODE_MODERATED,     'm',
 119     MODE_TOPICLIMIT,    't',
 120     MODE_INVITEONLY,    'i',
 121     MODE_NOPRIVMSGS,    'n',
 122     MODE_KEY,           'k',
 123     MODE_BAN,           'b',
 124     MODE_LIMIT,         'l',
 125     MODE_REGONLY,       'r',
 126     MODE_DELJOINS,      'D',
 127     0x0, 0x0
 128   };
 129   int *flag_p;
 130   unsigned int del_mode = 0;
 131   char control_buf[20];
 132   int control_buf_i = 0;
 133   struct ModeBuf mbuf;
 134   struct Ban *link, *next;
 135   struct Membership *member;
 136
 137   /* Ok, so what are we supposed to get rid of? */
 138   for (; *control; control++) {
 139     for (flag_p = flags; flag_p[0]; flag_p += 2)
 140       if (*control == flag_p[1]) {
 141         del_mode |= flag_p[0];
 142         break;
 143       }
 144   }
 145
 146   if (!del_mode)
 147     return 0; /* nothing to remove; ho hum. */
 148
 149   modebuf_init(&mbuf, sptr, cptr, chptr,
 150                (MODEBUF_DEST_CHANNEL | /* Send MODE to channel */
 151                 MODEBUF_DEST_OPMODE  | /* Treat it like an OPMODE */
 152                 MODEBUF_DEST_HACK4));  /* Generate a HACK(4) notice */
 153
 154   modebuf_mode(&mbuf, MODE_DEL | (del_mode & chptr->mode.mode));
 155   chptr->mode.mode &= ~del_mode; /* and of course actually delete them */
 156
 157   /* If we're removing invite, remove all the invites */
 158   if (del_mode & MODE_INVITEONLY)
 159     mode_invite_clear(chptr);
 160
 161   /*
 162    * If we're removing the key, note that; note that we can't clear
 163    * the key until after modebuf_* are done with it
 164    */
 165   if (del_mode & MODE_KEY && *chptr->mode.key)
 166     modebuf_mode_string(&mbuf, MODE_DEL | MODE_KEY, chptr->mode.key, 0);
 167
 168   /* If we're removing the limit, note that and clear the limit */
 169   if (del_mode & MODE_LIMIT && chptr->mode.limit) {
 170     modebuf_mode_uint(&mbuf, MODE_DEL | MODE_LIMIT, chptr->mode.limit);
 171     chptr->mode.limit = 0; /* not referenced, so safe */
 172   }
 173
 174   /*
 175    * Go through and mark the bans for deletion; note that we can't
 176    * free them until after modebuf_* are done with them
 177    */
 178   if (del_mode & MODE_BAN) {
 179     for (link = chptr->banlist; link; link = next) {
 180       char *bandup;
 181       next = link->next;
 182
 183       DupString(bandup, link->banstr);
 184       modebuf_mode_string(&mbuf, MODE_DEL | MODE_BAN, /* delete ban */
 185                           bandup, 1);
 186       free_ban(link);
 187     }
 188
 189     chptr->banlist = 0;
 190   }
 191
 192   /* Deal with users on the channel */
 193   if (del_mode & (MODE_BAN | MODE_CHANOP | MODE_VOICE))
 194     for (member = chptr->members; member; member = member->next_member) {
 195       if (IsZombie(member)) /* we ignore zombies */
 196         continue;
 197
 198       if (del_mode & MODE_BAN) /* If we cleared bans, clear the valid flags */
 199         ClearBanValid(member);
 200
 201       /* Drop channel operator status */
 202       if (IsChanOp(member) && del_mode & MODE_CHANOP) {
 203         modebuf_mode_client(&mbuf, MODE_DEL | MODE_CHANOP, member->user, MAXOPLEVEL + 1);
 204         member->status &= ~CHFL_CHANOP;
 205       }
 206
 207       /* Drop voice */
 208       if (HasVoice(member) && del_mode & MODE_VOICE) {
 209         modebuf_mode_client(&mbuf, MODE_DEL | MODE_VOICE, member->user, MAXOPLEVEL + 1);
 210         member->status &= ~CHFL_VOICE;
 211       }
 212     }
 213
 214   /* And flush the modes to the channel */
 215   modebuf_flush(&mbuf);
 216
 217   /* Finally, we can clear the key... */
 218   if (del_mode & MODE_KEY)
 219     chptr->mode.key[0] = '\0';
 220
 221   /* Ok, build control string again */
 222   for (flag_p = flags; flag_p[0]; flag_p += 2)
 223     if (del_mode & flag_p[0])
 224       control_buf[control_buf_i++] = flag_p[1];
 225
 226   control_buf[control_buf_i] = '\0';
 227
 228   /* Log it... */
 229   log_write(LS_OPERMODE, L_INFO, LOG_NOSNOTICE, "%#C CLEARMODE %H %s", sptr,
 230             chptr, control_buf);
 231
 232   /* Then send it */
 233   if (!IsLocalChannel(chptr->chname))
 234     sendcmdto_serv_butone(sptr, CMD_CLEARMODE, cptr, "%H %s", chptr,
 235                           control_buf);
 236
 237   return 0;
 238 }
 239
 240 /*
 241  * ms_clearmode - server message handler
 242  *
 243  * parv[0] = Send prefix
 244  * parv[1] = Channel name
 245  * parv[2] = Control string
 246  */
 247 int
 248 ms_clearmode(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 249 {
 250   struct Channel *chptr;
 251
 252   if (parc < 3)
 253     return need_more_params(sptr, "CLEARMODE");
 254
 255   if (!IsPrivileged(sptr)) {
 256     protocol_violation(sptr,"No privileges on source for CLEARMODE, desync?");
 257     return send_reply(sptr, ERR_NOPRIVILEGES);
 258   }
 259
 260   if (!IsChannelName(parv[1]) || IsLocalChannel(parv[1]) ||
 261       !(chptr = FindChannel(parv[1])))
 262     return send_reply(sptr, ERR_NOSUCHCHANNEL, parv[1]);
 263
 264   return do_clearmode(cptr, sptr, chptr, parv[2]);
 265 }
 266
 267 /*
 268  * mo_clearmode - oper message handler
 269  *
 270  * parv[0] = Send prefix
 271  * parv[1] = Channel name
 272  * parv[2] = Control string
 273  */
 274 int
 275 mo_clearmode(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 276 {
 277   struct Channel *chptr;
 278   char *control = "ovpsmikbl"; /* default control string */
 279   const char *chname, *qreason;
 280   int force = 0;
 281
 282   if (!feature_bool(FEAT_CONFIG_OPERCMDS))
 283     return send_reply(sptr, ERR_DISABLED, "CLEARMODE");
 284
 285   if (parc < 2)
 286     return need_more_params(sptr, "CLEARMODE");
 287
 288   if (parc > 2)
 289     control = parv[2];
 290
 291   chname = parv[1];
 292   if (*chname == '!')
 293   {
 294     chname++;
 295     if (!HasPriv(sptr, IsLocalChannel(chname) ?
 296                          PRIV_FORCE_LOCAL_OPMODE :
 297                          PRIV_FORCE_OPMODE))
 298       return send_reply(sptr, ERR_NOPRIVILEGES);
 299     force = 1;
 300   }
 301
 302   if (!HasPriv(sptr,
 303                IsLocalChannel(chname) ? PRIV_LOCAL_OPMODE : PRIV_OPMODE))
 304     return send_reply(sptr, ERR_NOPRIVILEGES);
 305
 306   if (('#' != *chname && '&' != *chname) || !(chptr = FindChannel(chname)))
 307     return send_reply(sptr, ERR_NOSUCHCHANNEL, chname);
 308
 309   if (!force && (qreason = find_quarantine(chptr->chname)))
 310     return send_reply(sptr, ERR_QUARANTINED, chptr->chname, qreason);
 311
 312   return do_clearmode(cptr, sptr, chptr, control);
 313 }