/*
  *   IRC - Internet Relay Chat, src/modules/kick.c
  *   (C) 2004 The UnrealIRCd Team
  *
  *   See file AUTHORS in IRC package for additional names of
  *   the programmers.
  *
  *   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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include "unrealircd.h"
 
 ModuleHeader MOD_HEADER
   = {
 	"kick",
 	"5.0",
 	"command /kick",
 	"UnrealIRCd Team",
 	"unrealircd-6",
     };
 
 /* Forward declarations */
 CMD_FUNC(cmd_kick);
 void _kick_user(MessageTag *mtags, Channel *channel, Client *client, Client *victim, char *comment);
 
 MOD_TEST()
 {
 	MARK_AS_OFFICIAL_MODULE(modinfo);
 	EfunctionAddVoid(modinfo->handle, EFUNC_KICK_USER, _kick_user);
 	return MOD_SUCCESS;
 }
 
 MOD_INIT()
 {
 	CommandAdd(modinfo->handle, "KICK", cmd_kick, 3, CMD_USER|CMD_SERVER);
 	MARK_AS_OFFICIAL_MODULE(modinfo);
 	return MOD_SUCCESS;
 }
 
 MOD_LOAD()
 {
 	return MOD_SUCCESS;
 }
 
 MOD_UNLOAD()
 {
 	return MOD_SUCCESS;
 }
 
 void kick_operoverride_msg(Client *client, Channel *channel, Client *target, char *reason)
 {
 	unreal_log(ULOG_INFO, "operoverride", "OPEROVERRIDE_KICK", client,
 		   "OperOverride: $client.details kicked $target from $channel ($reason)",
 		   log_data_string("override_type", "kick"),
 		   log_data_string("reason", reason),
 		   log_data_client("target", target),
 		   log_data_channel("channel", channel));
 }
 
 /** Kick a user from a channel.
  * @param initial_mtags	Message tags associated with this KICK (can be NULL)
  * @param channel	The channel where the KICK should happen
  * @param client	The evil user doing the kick, can be &me
  * @param victim	The target user that will be kicked
  * @param comment	The KICK comment (cannot be NULL)
  * @notes The msgid in initial_mtags is actually used as a prefix.
  *        The actual mtag will be "initial_mtags_msgid-suffix_msgid"
  *        All this is done in order for message tags to be
  *        consistent accross servers.
  *        The suffix is necessary to handle multi-target-kicks.
  *        If initial_mtags is NULL then we will autogenerate one.
  */
 void _kick_user(MessageTag *initial_mtags, Channel *channel, Client *client, Client *victim, char *comment)
 {
 	MessageTag *mtags = NULL;
 	int initial_mtags_generated = 0;
 
 	if (!initial_mtags)
 	{
 		/* Yeah, we allow callers to be lazy.. */
 		initial_mtags_generated = 1;
 		new_message(client, NULL, &initial_mtags);
 	}
 
 	new_message_special(client, initial_mtags, &mtags, ":%s KICK %s %s", client->name, channel->name, victim->name);
 	/* The same message is actually sent at 5 places below (though max 4 at most) */
 
 	if (MyUser(client))
 		RunHook(HOOKTYPE_LOCAL_KICK, client, victim, channel, mtags, comment);
 	else
 		RunHook(HOOKTYPE_REMOTE_KICK, client, victim, channel, mtags, comment);
 
 	if (invisible_user_in_channel(victim, channel))
 	{
 		/* Send it only to chanops & victim */
 		sendto_channel(channel, client, victim,
 			       "h", 0,
 			       SEND_LOCAL, mtags,
 			       ":%s KICK %s %s :%s",
 			       client->name, channel->name, victim->name, comment);
 
 		if (MyUser(victim))
 		{
 			sendto_prefix_one(victim, client, mtags, ":%s KICK %s %s :%s",
 				client->name, channel->name, victim->name, comment);
 		}
 	} else {
 		/* NORMAL */
 		sendto_channel(channel, client, NULL, 0, 0, SEND_LOCAL, mtags,
 			       ":%s KICK %s %s :%s",
 			       client->name, channel->name, victim->name, comment);
 	}
 
 	sendto_server(client, 0, 0, mtags, ":%s KICK %s %s :%s",
 	    client->id, channel->name, victim->id, comment);
 
 	free_message_tags(mtags);
 	if (initial_mtags_generated)
 	{
 		free_message_tags(initial_mtags);
 		initial_mtags = NULL;
 	}
 
 	if (MyUser(victim))
 	{
 		unreal_log(ULOG_INFO, "kick", "LOCAL_CLIENT_KICK", victim,
 		           "User $client kicked from $channel",
 		           log_data_channel("channel", channel));
 	} else {
 		unreal_log(ULOG_INFO, "kick", "REMOTE_CLIENT_KICK", victim,
 		           "User $client kicked from $channel",
 		           log_data_channel("channel", channel));
 	}
 
 	remove_user_from_channel(victim, channel, 1);
 }
 
 /*
 ** cmd_kick
 **	parv[1] = channel (single channel)
 **	parv[2] = client to kick (comma separated)
 **	parv[3] = kick comment
 */
 
 CMD_FUNC(cmd_kick)
 {
 	Client *target;
 	Channel *channel;
 	int  chasing = 0;
 	char *p = NULL, *user, *p2 = NULL, *badkick;
 	char comment[MAXKICKLEN+1];
 	Membership *lp;
 	Hook *h;
 	int ret;
 	int ntargets = 0;
 	int maxtargets = max_targets_for_command("KICK");
 	MessageTag *mtags;
 	char request[BUFSIZE];
 	char request_chans[BUFSIZE];
 	const char *client_member_modes = NULL;
 	const char *target_member_modes;
 
 	if (parc < 3 || *parv[1] == '\0')
 	{
 		sendnumeric(client, ERR_NEEDMOREPARAMS, "KICK");
 		return;
 	}
 
 	if (BadPtr(parv[3]))
 		strlcpy(comment, client->name, sizeof(comment));
 	else
 		strlncpy(comment, parv[3], sizeof(comment), iConf.kick_length);
 
 	strlcpy(request_chans, parv[1], sizeof(request_chans));
 	p = strchr(request_chans, ',');
 	if (p)
 		*p = '\0';
 	channel = find_channel(request_chans);
 	if (!channel)
 	{
 		sendnumeric(client, ERR_NOSUCHCHANNEL, request_chans);
 		return;
 	}
 
 	/* Store "client" access flags */
 	if (IsUser(client))
 		client_member_modes = get_channel_access(client, channel);
 	if (MyUser(client) && !IsULine(client) &&
 	    !op_can_override("channel:override:kick:no-ops",client,channel,NULL) &&
 	    !check_channel_access(client, channel, "hoaq"))
 	{
 		sendnumeric(client, ERR_CHANOPRIVSNEEDED, channel->name);
 		return;
 	}
 
 	strlcpy(request, parv[2], sizeof(request));
 	for (user = strtoken(&p2, request, ","); user; user = strtoken(&p2, NULL, ","))
 	{
 		if (MyUser(client) && (++ntargets > maxtargets))
 		{
 			sendnumeric(client, ERR_TOOMANYTARGETS, user, maxtargets, "KICK");
 			break;
 		}
 
 		if (!(target = find_chasing(client, user, &chasing)))
 			continue;	/* No such user left! */
 
 		if (!target->user)
 			continue; /* non-user */
 
 		lp = find_membership_link(target->user->channel, channel);
 		if (!lp)
 		{
 			if (MyUser(client))
 				sendnumeric(client, ERR_USERNOTINCHANNEL, user, request_chans);
 			continue;
 		}
 
 		if (IsULine(client) || IsServer(client) || IsMe(client))
 			goto attack;
 
 		/* Note for coders regarding oper override:
 		 * always let a remote kick (=from a user on another server) through or
 		 * else we will get desynced. In short this means all the denying should
 		 * always contain a && MyUser(client) and at the end
 		 * a remote kick should always be allowed (pass through). -- Syzop
 		 */
 
 		/* Store "target" access flags */
 		target_member_modes = get_channel_access(target, channel);
 
 		badkick = NULL;
 		ret = EX_ALLOW;
 		for (h = Hooks[HOOKTYPE_CAN_KICK]; h; h = h->next) {
 			int n = (*(h->func.intfunc))(client, target, channel, comment, client_member_modes, target_member_modes, &badkick);
 
 			if (n == EX_DENY)
 				ret = n;
 			else if (n == EX_ALWAYS_DENY)
 			{
 				ret = n;
 				break;
 			}
 		}
 
 		if (ret == EX_ALWAYS_DENY)
 		{
 			if (MyUser(client) && badkick)
 				sendto_one(client, NULL, "%s", badkick); /* send error, if any */
 
 			if (MyUser(client))
 				continue; /* reject the kick (note: we never block remote kicks) */
 		}
 
 		if (ret == EX_DENY)
 		{
 			/* If set it means 'not allowed to kick'.. now check if (s)he can override that.. */
 			if (op_can_override("channel:override:kick:no-ops",client,channel,NULL))
 			{
 				kick_operoverride_msg(client, channel, target, comment);
 				goto attack; /* all other checks don't matter anymore (and could cause double msgs) */
 			} else {
 				/* Not an oper overriding */
 				if (MyUser(client) && badkick)
 					sendto_one(client, NULL, "%s", badkick); /* send error, if any */
 
 				continue; /* reject the kick */
 			}
 		}
 
 		// FIXME: Most, maybe even all, of these must be moved to HOOKTYPE_CAN_KICK checks in the corresponding halfop/chanop/chanadmin/chanowner modules :)
 		// !!!! FIXME
 
 		/* we are neither +o nor +h, OR..
 		 * we are +h but target is +o, OR...
 		 * we are +h and target is +h
 		 */
 		if (op_can_override("channel:override:kick:no-ops",client,channel,NULL))
 		{
 			if ((!check_channel_access_string(client_member_modes, "o") && !check_channel_access_string(client_member_modes, "h")) ||
 			    (check_channel_access_string(client_member_modes, "h") && check_channel_access_string(target_member_modes, "h")) ||
 			    (check_channel_access_string(client_member_modes, "h") && check_channel_access_string(target_member_modes, "o")))
 			{
 				kick_operoverride_msg(client, channel, target, comment);
 				goto attack;
 			}	/* is_chan_op */
 
 		}
 
 		/* target is +a/+q, and we are not +q? */
 		if (check_channel_access_string(target_member_modes, "qa") && !check_channel_access_string(client_member_modes, "q"))
 		{
 			if (client == target)
 				goto attack; /* kicking self == ok */
 			if (op_can_override("channel:override:kick:owner",client,channel,NULL)) /* (and f*ck local ops) */
 			{
 				/* IRCop kicking owner/prot */
 				kick_operoverride_msg(client, channel, target, comment);
 				goto attack;
 			}
 			else if (!IsULine(client) && (target != client) && MyUser(client))
 			{
 				char errbuf[NICKLEN+25];
 				if (check_channel_access_string(target_member_modes, "q"))
 					ircsnprintf(errbuf, sizeof(errbuf), "%s is a channel owner", target->name);
 				else
 					ircsnprintf(errbuf, sizeof(errbuf), "%s is a channel admin", target->name);
 				sendnumeric(client, ERR_CANNOTDOCOMMAND, "KICK", errbuf);
 				goto deny;
 			}
 		}
 
 		/* target is +o, we are +h [operoverride is already taken care of 2 blocks above] */
 		if (check_channel_access_string(target_member_modes, "h") && check_channel_access_string(client_member_modes, "h")
 		    && !check_channel_access_string(client_member_modes, "o") && !IsULine(client) && MyUser(client))
 		{
 			char errbuf[NICKLEN+30];
 			ircsnprintf(errbuf, sizeof(errbuf), "%s is a channel operator", target->name);
 			sendnumeric(client, ERR_CANNOTDOCOMMAND, "KICK",
 				   errbuf);
 			goto deny;
 		}
 
 		/* target is +h, we are +h [operoverride is already taken care of 3 blocks above] */
 		if (check_channel_access_string(target_member_modes, "o") && check_channel_access_string(client_member_modes, "h")
 		    && !check_channel_access_string(client_member_modes, "o") && MyUser(client))
 		{
 			char errbuf[NICKLEN+15];
 			ircsnprintf(errbuf, sizeof(errbuf), "%s is a halfop", target->name);
 			sendnumeric(client, ERR_CANNOTDOCOMMAND, "KICK",
 				   errbuf);
 			goto deny;
 		}	/* halfop */
 
 		/* allowed (either coz access granted or a remote kick), so attack! */
 		goto attack;
 
 	      deny:
 		continue;
 
 	      attack:
 		if (MyConnect(client)) {
 			int breakit = 0;
 			Hook *h;
 			for (h = Hooks[HOOKTYPE_PRE_LOCAL_KICK]; h; h = h->next) {
 				if ((*(h->func.intfunc))(client,target,channel,comment) > 0) {
 					breakit = 1;
 					break;
 				}
 			}
 			if (breakit)
 				continue;
 		}
 
 		kick_user(recv_mtags, channel, client, target, comment);
 	}
 }

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