viewvc/contrib/m_clearchan.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  m_clearchan.c: Performs a channel takeover
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 *
 *  $Id: m_clearchan.c 801 2006-08-30 16:54:25Z adx $
 */

#include "stdinc.h"
#include "handlers.h"
#include "channel.h"
#include "channel_mode.h"
#include "client.h"
#include "ircd.h"
#include "numeric.h"
#include "server.h"
#include "send.h"
#include "hash.h"
#include "msg.h"
#include "parse.h"
#include "conf/modules.h"
#include "common.h"
#include "user.h"

static void mo_clearchan(struct Client *, struct Client *, int, char *[]);
static void kick_list(struct Client *, struct Channel *);
static void remove_our_modes(struct Channel *);
static void remove_a_mode(struct Channel *, int, char);

struct Message clearchan_msgtab = {
  "CLEARCHAN", 0, 0, 2, 0, MFLG_SLOW, 0,
  { m_unregistered, m_not_oper, m_ignore, m_ignore, mo_clearchan, m_ignore }
};

INIT_MODULE(m_clearchan, "$Revision: 801 $")
{
  mod_add_cmd(&clearchan_msgtab);
}

CLEANUP_MODULE
{
  mod_del_cmd(&clearchan_msgtab);
}


/*! \brief CLEARCHAN command handler (called for operators only)
 *
 * \param client_p Pointer to allocated Client struct with physical connection
 *                 to this server, i.e. with an open socket connected.
 * \param source_p Pointer to allocated Client struct from which the message
 *                 originally comes from.  This can be a local or remote client.
 * \param parc     Integer holding the number of supplied arguments.
 * \param parv     Argument vector where parv[0] .. parv[parc-1] are non-NULL
 *                 pointers.
 * \note Valid arguments for this command are:
 *      - parv[0] = sender prefix
 *      - parv[1] = channel name
 */
static void
mo_clearchan(struct Client *client_p, struct Client *source_p,
             int parc, char *parv[])
{
  struct Channel *chptr = NULL;

  if (!IsAdmin(source_p))
  {
    sendto_one(source_p, form_str(ERR_NOPRIVILEGES),
               me.name, source_p->name);
    return;
  }

  if ((chptr = hash_find_channel(parv[1])) == NULL)
  {
    sendto_one(source_p, form_str(ERR_NOSUCHCHANNEL),
               me.name, source_p->name, parv[1]);
    return;
  }

  if (IsMember(source_p, chptr))
  {
    sendto_one(source_p, ":%s NOTICE %s :*** Please part %s before using CLEARCHAN",
               me.name, source_p->name, chptr->chname);
    return;
  }

  sendto_wallops_flags(UMODE_WALLOP, &me, "CLEARCHAN called for [%s] by %s",
                       chptr->chname, get_oper_name(source_p));
  sendto_server(NULL, source_p, NULL, NOCAPS, NOCAPS,
                ":%s WALLOPS :CLEARCHAN called for [%s] by %s",
                me.name, chptr->chname, get_oper_name(source_p));
  ilog(L_NOTICE, "CLEARCHAN called for [%s] by %s",
       chptr->chname, get_oper_name(source_p));

  /*
   * Kill all the modes we have about the channel..
   * making everyone a peon
   */  
  remove_our_modes(chptr);

  /* SJOIN the user to give them ops, and lock the channel */
  sendto_server(client_p, source_p, chptr, CAP_TS6, NOCAPS,
                ":%s JOIN %lu %s +ntsi",
                source_p->id, (unsigned long)(chptr->channelts - 1),
                chptr->chname);
  sendto_server(client_p, source_p, chptr, NOCAPS, CAP_TS6,
                ":%s SJOIN %lu %s +ntsi :@%s",
                me.name, (unsigned long)(chptr->channelts - 1),
                chptr->chname, source_p->name);
  sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s JOIN %s",
                       source_p->name, source_p->username,
                       source_p->host, chptr->chname);
  sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s +o %s",
                       me.name, chptr->chname, source_p->name);

  /*
   * Take the TS down by 1, so we don't see the channel taken over
   * again.
   */
  if (chptr->channelts)
    --chptr->channelts;

  chptr->mode.mode = MODE_SECRET | MODE_TOPICLIMIT |
                     MODE_INVITEONLY | MODE_NOPRIVMSGS;
  free_topic(chptr);
  chptr->mode.key[0] = '\0';

  /* Kick the users out and join the oper */
  kick_list(source_p, chptr);
}

static void
kick_list(struct Client *source_p, struct Channel *chptr)
{
  dlink_node *ptr = NULL, *ptr_next = NULL;
  struct Membership *ms = NULL;

  DLINK_FOREACH(ptr, chptr->members.head)
  {
    ms = ptr->data;

    sendto_channel_local(ALL_MEMBERS, NO, chptr,
                         ":%s!%s@%s KICK %s %s CLEARCHAN",
                         source_p->name, source_p->username,
                         source_p->host, chptr->chname, ms->client_p->name);
    sendto_server(NULL, source_p, chptr, NOCAPS, NOCAPS,
                  ":%s KICK %s %s :CLEARCHAN", source_p->name,
                  chptr->chname, ms->client_p->name);
  }

  add_user_to_channel(chptr, source_p, CHFL_CHANOP, NO);

  DLINK_FOREACH_SAFE(ptr, ptr_next, chptr->members.head)
  {
    ms = ptr->data;

    if (ms->client_p != source_p)
      remove_user_from_channel(ms);
  }

  /*
   * Join the user themselves to the channel down here, so they dont see a nicklist
   * or people being kicked
   */
  sendto_one(source_p, ":%s!%s@%s JOIN %s",
             source_p->name, source_p->username,
             source_p->host, chptr->chname);
  channel_member_names(source_p, chptr, 1);
}

/* remove_our_modes()
 *
 * inputs       - hide from ops or not int flag
 *              - pointer to channel to remove modes from
 *              - client pointer
 * output       - NONE
 * side effects - Go through the local members, remove all their
 *                chanop modes etc., this side lost the TS.
 */
static void
remove_our_modes(struct Channel *chptr)
{
  remove_a_mode(chptr, CHFL_CHANOP, 'o');
#ifdef HALFOPS
  remove_a_mode(chptr, CHFL_HALFOP, 'h');
#endif
  remove_a_mode(chptr, CHFL_VOICE, 'v');

  /* Clear all +beI modes */
  free_channel_list(&chptr->banlist);
  free_channel_list(&chptr->exceptlist);
  free_channel_list(&chptr->invexlist);
}

/* remove_a_mode()
 *
 * inputs       -
 * output       - NONE
 * side effects - remove ONE mode from a channel
 */
static void
remove_a_mode(struct Channel *chptr, int mask, char flag)
{
  const dlink_node *ptr = NULL;
  char lmodebuf[MODEBUFLEN];
  const char *lpara[4] = { "", "", "", "" };
  char *mbuf = lmodebuf;
  int count = 0;

  *mbuf++ = '-';

  DLINK_FOREACH(ptr, chptr->members.head)
  {
    struct Membership *ms = ptr->data;
    if ((ms->flags & mask) == 0)
      continue;

    ms->flags &= ~mask;

    lpara[count++] = ms->client_p->name;

    *mbuf++ = flag;

    if (count == 4)
    {
      *mbuf = '\0';
      sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s %s %s %s %s",
                           me.name, chptr->chname, lmodebuf, lpara[0],
                           lpara[1], lpara[2], lpara[3]);

      mbuf = lmodebuf;
      *mbuf++ = '-';
      count = 0;
      lpara[0] = lpara[1] = lpara[2] = lpara[3] = "";
    }
  }

  if (count != 0)
  {
    *mbuf = '\0';
    sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s %s %s %s %s",
                         me.name, chptr->chname, lmodebuf, lpara[0],
                         lpara[1], lpara[2], lpara[3]);
  }
}
Revision:	812
Committed:	Thu Sep 7 09:41:54 2006 UTC (19 years, 11 months ago) by michael
Content type:	text/x-csrc
File size:	7904 byte(s)
Log Message:	- Imported contrib/
#	User	Rev	Content
1	michael	812	/*
2			* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3			* m_clearchan.c: Performs a channel takeover
4			*
5			* Copyright (C) 2002 by the past and present ircd coders, and others.
6			*
7			* This program is free software; you can redistribute it and/or modify
8			* it under the terms of the GNU General Public License as published by
9			* the Free Software Foundation; either version 2 of the License, or
10			* (at your option) any later version.
11			*
12			* This program is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			* GNU General Public License for more details.
16			*
17			* You should have received a copy of the GNU General Public License
18			* along with this program; if not, write to the Free Software
19			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20			* USA
21			*
22			* $Id: m_clearchan.c 801 2006-08-30 16:54:25Z adx $
23			*/
24
25			#include "stdinc.h"
26			#include "handlers.h"
27			#include "channel.h"
28			#include "channel_mode.h"
29			#include "client.h"
30			#include "ircd.h"
31			#include "numeric.h"
32			#include "server.h"
33			#include "send.h"
34			#include "hash.h"
35			#include "msg.h"
36			#include "parse.h"
37			#include "conf/modules.h"
38			#include "common.h"
39			#include "user.h"
40
41			static void mo_clearchan(struct Client , struct Client , int, char *[]);
42			static void kick_list(struct Client , struct Channel );
43			static void remove_our_modes(struct Channel *);
44			static void remove_a_mode(struct Channel *, int, char);
45
46			struct Message clearchan_msgtab = {
47			"CLEARCHAN", 0, 0, 2, 0, MFLG_SLOW, 0,
48			{ m_unregistered, m_not_oper, m_ignore, m_ignore, mo_clearchan, m_ignore }
49			};
50
51			INIT_MODULE(m_clearchan, "$Revision: 801 $")
52			{
53			mod_add_cmd(&clearchan_msgtab);
54			}
55
56			CLEANUP_MODULE
57			{
58			mod_del_cmd(&clearchan_msgtab);
59			}
60
61
62			/*! \brief CLEARCHAN command handler (called for operators only)
63			*
64			* \param client_p Pointer to allocated Client struct with physical connection
65			* to this server, i.e. with an open socket connected.
66			* \param source_p Pointer to allocated Client struct from which the message
67			* originally comes from. This can be a local or remote client.
68			* \param parc Integer holding the number of supplied arguments.
69			* \param parv Argument vector where parv[0] .. parv[parc-1] are non-NULL
70			* pointers.
71			* \note Valid arguments for this command are:
72			* - parv[0] = sender prefix
73			* - parv[1] = channel name
74			*/
75			static void
76			mo_clearchan(struct Client client_p, struct Client source_p,
77			int parc, char *parv[])
78			{
79			struct Channel *chptr = NULL;
80
81			if (!IsAdmin(source_p))
82			{
83			sendto_one(source_p, form_str(ERR_NOPRIVILEGES),
84			me.name, source_p->name);
85			return;
86			}
87
88			if ((chptr = hash_find_channel(parv[1])) == NULL)
89			{
90			sendto_one(source_p, form_str(ERR_NOSUCHCHANNEL),
91			me.name, source_p->name, parv[1]);
92			return;
93			}
94
95			if (IsMember(source_p, chptr))
96			{
97			sendto_one(source_p, ":%s NOTICE %s :*** Please part %s before using CLEARCHAN",
98			me.name, source_p->name, chptr->chname);
99			return;
100			}
101
102			sendto_wallops_flags(UMODE_WALLOP, &me, "CLEARCHAN called for [%s] by %s",
103			chptr->chname, get_oper_name(source_p));
104			sendto_server(NULL, source_p, NULL, NOCAPS, NOCAPS,
105			":%s WALLOPS :CLEARCHAN called for [%s] by %s",
106			me.name, chptr->chname, get_oper_name(source_p));
107			ilog(L_NOTICE, "CLEARCHAN called for [%s] by %s",
108			chptr->chname, get_oper_name(source_p));
109
110			/*
111			* Kill all the modes we have about the channel..
112			* making everyone a peon
113			*/
114			remove_our_modes(chptr);
115
116			/* SJOIN the user to give them ops, and lock the channel */
117			sendto_server(client_p, source_p, chptr, CAP_TS6, NOCAPS,
118			":%s JOIN %lu %s +ntsi",
119			source_p->id, (unsigned long)(chptr->channelts - 1),
120			chptr->chname);
121			sendto_server(client_p, source_p, chptr, NOCAPS, CAP_TS6,
122			":%s SJOIN %lu %s +ntsi :@%s",
123			me.name, (unsigned long)(chptr->channelts - 1),
124			chptr->chname, source_p->name);
125			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s JOIN %s",
126			source_p->name, source_p->username,
127			source_p->host, chptr->chname);
128			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s +o %s",
129			me.name, chptr->chname, source_p->name);
130
131			/*
132			* Take the TS down by 1, so we don't see the channel taken over
133			* again.
134			*/
135			if (chptr->channelts)
136			--chptr->channelts;
137
138			chptr->mode.mode = MODE_SECRET \| MODE_TOPICLIMIT \|
139			MODE_INVITEONLY \| MODE_NOPRIVMSGS;
140			free_topic(chptr);
141			chptr->mode.key[0] = '\0';
142
143			/* Kick the users out and join the oper */
144			kick_list(source_p, chptr);
145			}
146
147			static void
148			kick_list(struct Client source_p, struct Channel chptr)
149			{
150			dlink_node ptr = NULL, ptr_next = NULL;
151			struct Membership *ms = NULL;
152
153			DLINK_FOREACH(ptr, chptr->members.head)
154			{
155			ms = ptr->data;
156
157			sendto_channel_local(ALL_MEMBERS, NO, chptr,
158			":%s!%s@%s KICK %s %s CLEARCHAN",
159			source_p->name, source_p->username,
160			source_p->host, chptr->chname, ms->client_p->name);
161			sendto_server(NULL, source_p, chptr, NOCAPS, NOCAPS,
162			":%s KICK %s %s :CLEARCHAN", source_p->name,
163			chptr->chname, ms->client_p->name);
164			}
165
166			add_user_to_channel(chptr, source_p, CHFL_CHANOP, NO);
167
168			DLINK_FOREACH_SAFE(ptr, ptr_next, chptr->members.head)
169			{
170			ms = ptr->data;
171
172			if (ms->client_p != source_p)
173			remove_user_from_channel(ms);
174			}
175
176			/*
177			* Join the user themselves to the channel down here, so they dont see a nicklist
178			* or people being kicked
179			*/
180			sendto_one(source_p, ":%s!%s@%s JOIN %s",
181			source_p->name, source_p->username,
182			source_p->host, chptr->chname);
183			channel_member_names(source_p, chptr, 1);
184			}
185
186			/* remove_our_modes()
187			*
188			* inputs - hide from ops or not int flag
189			* - pointer to channel to remove modes from
190			* - client pointer
191			* output - NONE
192			* side effects - Go through the local members, remove all their
193			* chanop modes etc., this side lost the TS.
194			*/
195			static void
196			remove_our_modes(struct Channel *chptr)
197			{
198			remove_a_mode(chptr, CHFL_CHANOP, 'o');
199			#ifdef HALFOPS
200			remove_a_mode(chptr, CHFL_HALFOP, 'h');
201			#endif
202			remove_a_mode(chptr, CHFL_VOICE, 'v');
203
204			/* Clear all +beI modes */
205			free_channel_list(&chptr->banlist);
206			free_channel_list(&chptr->exceptlist);
207			free_channel_list(&chptr->invexlist);
208			}
209
210			/* remove_a_mode()
211			*
212			* inputs -
213			* output - NONE
214			* side effects - remove ONE mode from a channel
215			*/
216			static void
217			remove_a_mode(struct Channel *chptr, int mask, char flag)
218			{
219			const dlink_node *ptr = NULL;
220			char lmodebuf[MODEBUFLEN];
221			const char *lpara[4] = { "", "", "", "" };
222			char *mbuf = lmodebuf;
223			int count = 0;
224
225			*mbuf++ = '-';
226
227			DLINK_FOREACH(ptr, chptr->members.head)
228			{
229			struct Membership *ms = ptr->data;
230			if ((ms->flags & mask) == 0)
231			continue;
232
233			ms->flags &= ~mask;
234
235			lpara[count++] = ms->client_p->name;
236
237			*mbuf++ = flag;
238
239			if (count == 4)
240			{
241			*mbuf = '\0';
242			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s %s %s %s %s",
243			me.name, chptr->chname, lmodebuf, lpara[0],
244			lpara[1], lpara[2], lpara[3]);
245
246			mbuf = lmodebuf;
247			*mbuf++ = '-';
248			count = 0;
249			lpara[0] = lpara[1] = lpara[2] = lpara[3] = "";
250			}
251			}
252
253			if (count != 0)
254			{
255			*mbuf = '\0';
256			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s %s %s %s %s",
257			me.name, chptr->chname, lmodebuf, lpara[0],
258			lpara[1], lpara[2], lpara[3]);
259			}
260			}