/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  m_kick.c: Kicks a user from a channel.
 *
 *  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_kick.c,v 1.9 2004/05/21 20:12:11 stu Exp $
 */

#include "stdinc.h"
#include "tools.h"
#include "handlers.h"
#include "channel.h"
#include "channel_mode.h"
#include "client.h"
#include "common.h" /* XXX IRCD_BUFSIZE */
#include "irc_string.h"
#include "ircd.h"
#include "numeric.h"
#include "send.h"
#include "msg.h"
#include "modules.h"
#include "parse.h"
#include "hash.h"
#include "packet.h"
#include "sprintf_irc.h"
#include "s_log.h" /* oftc_log */


static void m_kick(struct Client *, struct Client *, int, char **);

struct Message kick_msgtab = {
  "KICK", 0, 0, 3, 0, MFLG_SLOW, 0,
  {m_unregistered, m_kick, m_kick, m_kick, m_ignore}
};

#ifndef STATIC_MODULES
void
_modinit(void)
{
  mod_add_cmd(&kick_msgtab);
}

void
_moddeinit(void)
{
  mod_del_cmd(&kick_msgtab);
}

const char *_version = "$Revision: 1.9 $";
#endif

/* m_kick()
 *  parv[0] = sender prefix
 *  parv[1] = channel
 *  parv[2] = client to kick
 *  parv[3] = kick comment
 */
static void 
m_kick(struct Client *client_p, struct Client *source_p,
        int parc, char *parv[])
{
  struct Client *who;
  struct Channel *chptr;
  int chasing = 0;
  char *comment;
  char *name;
  char *p = NULL;
  char *user;
  struct Membership *ms = NULL;
  struct Membership *ms_target;

  if (*parv[2] == '\0')
  {
    sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS),
            me.name, parv[0], "KICK");
    return;
  }

  if (MyClient(source_p) && !IsFloodDone(source_p))
    flood_endgrace(source_p);

  comment = (EmptyString(parv[3])) ? parv[2] : parv[3];
  if (strlen(comment) > (size_t) TOPICLEN)
    comment[TOPICLEN] = '\0';

  name = parv[1];
  while (*name == ',')
    name++;
  if ((p = strchr(name,',')) != NULL)
    *p = '\0';
  if (!*name)
    return;

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

  if (!IsServer(source_p))
  {
    if ((ms = find_channel_link(source_p, chptr)) == NULL)
    {
      if (MyConnect(source_p))
      {
        sendto_one(source_p, form_str(ERR_NOTONCHANNEL),
                  me.name, source_p->name, name);
        return;
      }
    }

    if(chptr->mode.mode & MODE_NOCOLOR && msg_has_colors(comment))
        comment = strip_color(comment);
    if (!has_member_flags(ms, CHFL_CHANOP|CHFL_HALFOP))
    {
    /* was a user, not a server, and user isn't seen as a chanop here */
      if (IsGod(source_p) && MyConnect(source_p))
      {
        char tmp[IRCD_BUFSIZE];
        ircsprintf(tmp, "%s is using God mode: KICK %s %s %s", 
                source_p->name, chptr->chname, parv[2], parv[3] ? parv[3] : "");
        sendto_gnotice_flags(UMODE_SERVNOTICE, L_ALL, me.name, &me, NULL, tmp);
        oftc_log(tmp);
      } 
      else if (MyConnect(source_p))
      {
        /* user on _my_ server, with no chanops.. so go away */
        sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
            me.name, source_p->name, name);
        return;
      }

      if (chptr->channelts == 0)
      {
        /* If its a TS 0 channel, do it the old way */
        sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
              me.name, source_p->name, name);
        return;
      }
      /* Its a user doing a kick, but is not showing as chanop locally
       * its also not a user ON -my- server, and the channel has a TS.
       * There are two cases we can get to this point then...
       *
       *     1) connect burst is happening, and for some reason a legit
       *        op has sent a KICK, but the SJOIN hasn't happened yet or 
       *        been seen. (who knows.. due to lag...)
       *
       *     2) The channel is desynced. That can STILL happen with TS
       *        
       *     Now, the old code roger wrote, would allow the KICK to 
       *     go through. Thats quite legit, but lets weird things like
       *     KICKS by users who appear not to be chanopped happen,
       *     or even neater, they appear not to be on the channel.
       *     This fits every definition of a desync, doesn't it? ;-)
       *     So I will allow the KICK, otherwise, things are MUCH worse.
       *     But I will warn it as a possible desync.
       *
       *     -Dianora
       */
    }
  }

  user = parv[2];
  
  while (*user == ',')
    user++;
 
  if ((p = strchr(user,',')) != NULL)
    *p = '\0';
  
  if (!*user)
    return;

  if ((who = find_chasing(source_p, user, &chasing)) == NULL)
    return;

  if ((ms_target = find_channel_link(who, chptr)) != NULL)
  {
      /* half ops cannot kick other halfops on private channels */
#ifdef USE_HALFOPS
    if (has_member_flags(ms, CHFL_HALFOP))
    {
        if (((chptr->mode.mode & MODE_PRIVATE) && 
                has_member_flags(ms_target, CHFL_CHANOP|CHFL_HALFOP)) || 
                has_member_flags(ms_target, CHFL_CHANOP))
      {
        sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
                           me.name, source_p->name, name);
        return;
      }
    }
#endif
   /* jdc
    * - In the case of a server kicking a user (i.e. CLEARCHAN),
    *   the kick should show up as coming from the server which did
    *   the kick.
    * - Personally, flame and I believe that server kicks shouldn't
    *   be sent anyways.  Just waiting for some oper to abuse it...
    */
    if (IsServer(source_p))
      sendto_channel_local(ALL_MEMBERS, chptr, ":%s KICK %s %s :%s",
                           source_p->name, name, who->name, comment);
    else
      sendto_channel_local(ALL_MEMBERS, chptr, ":%s!%s@%s KICK %s %s :%s",
                           source_p->name, source_p->username,
                           source_p->host, name, who->name, comment);
    sendto_server(client_p, NULL, chptr, NOCAPS, NOCAPS, NOFLAGS,
                  ":%s KICK %s %s :%s", parv[0], chptr->chname,
                  who->name, comment);
    remove_user_from_channel(ms_target);
  }

  else
    sendto_one(source_p, form_str(ERR_USERNOTINCHANNEL),
            me.name, source_p->name, user, name);
}
