/*
 *  ircd-ratbox: A slightly useful ircd.
 *  m_resv.c: Reserves(jupes) a nickname or channel.
 *
 *  Copyright (C) 2001-2002 Hybrid Development Team
 *  Copyright (C) 2002-2005 ircd-ratbox development team
 *
 *  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
 *
 *  $Id$
 */

#include "stdinc.h"
#include "client.h"
#include "channel.h"
#include "ircd.h"
#include "numeric.h"
#include "s_serv.h"
#include "send.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"
#include "s_conf.h"
#include "s_newconf.h"
#include "hash.h"
#include "logger.h"
#include "bandbi.h"
#include "operhash.h"

static int mo_resv(struct Client *, struct Client *, int, const char **);
static int ms_resv(struct Client *, struct Client *, int, const char **);
static int me_resv(struct Client *, struct Client *, int, const char **);
static int mo_unresv(struct Client *, struct Client *, int, const char **);
static int ms_unresv(struct Client *, struct Client *, int, const char **);
static int me_unresv(struct Client *, struct Client *, int, const char **);

struct Message resv_msgtab = {
    "RESV", 0, 0, 0, MFLG_SLOW | MFLG_UNREG,
    {mg_ignore, mg_not_oper, {ms_resv, 4}, {ms_resv, 4}, {me_resv, 5}, {mo_resv, 3}}
};

struct Message unresv_msgtab = {
    "UNRESV", 0, 0, 0, MFLG_SLOW | MFLG_UNREG,
    {mg_ignore, mg_not_oper, {ms_unresv, 3}, {ms_unresv, 3}, {me_unresv, 2}, {mo_unresv, 2}}
};

mapi_clist_av1 resv_clist[] = { &resv_msgtab, &unresv_msgtab, NULL };

DECLARE_MODULE_AV1(resv, NULL, NULL, resv_clist, NULL, NULL, "$Revision$");

static void parse_resv(struct Client *source_p, const char *name,
                       const char *reason, int temp_time, int propagated);
static void propagate_resv(struct Client *source_p, const char *target,
                           int temp_time, const char *name, const char *reason);
static void cluster_resv(struct Client *source_p, int temp_time,
                         const char *name, const char *reason);

static void handle_remote_unresv(struct Client *source_p, const char *name);
static void remove_resv(struct Client *source_p, const char *name, int propagated);

/*
 * mo_resv()
 *      parv[0] = sender prefix
 *      parv[1] = channel/nick to forbid
 *      parv[2] = reason
 */
static int
mo_resv(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    const char *name;
    const char *reason;
    const char *target_server = NULL;
    int temp_time;
    int loc = 1;
    int propagated = ConfigFileEntry.use_propagated_bans;

    if(!IsOperResv(source_p)) {
        sendto_one(source_p, form_str(ERR_NOPRIVS), me.name, source_p->name, "resv");
        return 0;
    }

    /* RESV [time] <name> [ON <server>] :<reason> */

    if((temp_time = valid_temp_time(parv[loc])) >= 0)
        loc++;
    /* we just set temp_time to -1! */
    else
        temp_time = 0;

    name = parv[loc];
    loc++;

    if((parc >= loc + 2) && (irccmp(parv[loc], "ON") == 0)) {
        if(!IsOperRemoteBan(source_p)) {
            sendto_one(source_p, form_str(ERR_NOPRIVS),
                       me.name, source_p->name, "remoteban");
            return 0;
        }

        target_server = parv[loc + 1];
        loc += 2;

        /* Set as local-only. */
        propagated = 0;
    }

    if(parc <= loc || EmptyString(parv[loc])) {
        sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS), me.name, source_p->name, "RESV");
        return 0;
    }

    reason = parv[loc];

    /* remote resv.. */
    if(target_server) {
        propagate_resv(source_p, target_server, temp_time, name, reason);

        if(match(target_server, me.name) == 0)
            return 0;
    } else if(!propagated && rb_dlink_list_length(&cluster_conf_list) > 0)
        cluster_resv(source_p, temp_time, name, reason);

    if(propagated && temp_time == 0) {
        sendto_one_notice(source_p, ":Cannot set a permanent global ban");
        return 0;
    }

    parse_resv(source_p, name, reason, temp_time, propagated);

    return 0;
}

/* ms_resv()
 *     parv[0] = sender prefix
 *     parv[1] = target server
 *     parv[2] = channel/nick to forbid
 *     parv[3] = reason
 */
static int
ms_resv(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    /* parv[0]  parv[1]        parv[2]  parv[3]
     * oper     target server  resv     reason
     */
    propagate_resv(source_p, parv[1], 0, parv[2], parv[3]);

    if(!match(parv[1], me.name))
        return 0;

    if(!IsPerson(source_p))
        return 0;

    parse_resv(source_p, parv[2], parv[3], 0, 0);
    return 0;
}

static int
me_resv(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    /* time name 0 :reason */
    if(!IsPerson(source_p))
        return 0;

    parse_resv(source_p, parv[2], parv[4], atoi(parv[1]), 0);
    return 0;
}

/* parse_resv()
 *
 * inputs       - source_p if error messages wanted
 * 		- thing to resv
 * 		- reason for resv
 * outputs	-
 * side effects - will parse the resv and create it if valid
 */
static void
parse_resv(struct Client *source_p, const char *name, const char *reason, int temp_time, int propagated)
{
    struct ConfItem *aconf;

    if(!MyClient(source_p) &&
       !find_shared_conf(source_p->username, source_p->host,
                         source_p->servptr->name,
                         (temp_time > 0) ? SHARED_TRESV : SHARED_PRESV))
        return;

    if(IsChannelName(name)) {
        if(hash_find_resv(name)) {
            sendto_one_notice(source_p,
                              ":A RESV has already been placed on channel: %s", name);
            return;
        }

        if(strlen(name) > CHANNELLEN) {
            sendto_one_notice(source_p, ":Invalid RESV length: %s", name);
            return;
        }

        if(strchr(reason, '"')) {
            sendto_one_notice(source_p, ":Invalid character '\"' in comment");
            return;
        }

        aconf = make_conf();
        aconf->status = CONF_RESV_CHANNEL;
        aconf->port = 0;
        aconf->created = rb_current_time();
        aconf->host = rb_strdup(name);
        aconf->passwd = rb_strdup(reason);
        aconf->info.oper = operhash_add(get_oper_name(source_p));

        if(propagated) {
            aconf->flags |= CONF_FLAGS_MYOPER | CONF_FLAGS_TEMPORARY;
            aconf->hold = rb_current_time() + temp_time;
            aconf->lifetime = aconf->hold;
            replace_old_ban(aconf);
            rb_dlinkAddAlloc(aconf, &prop_bans);

            sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                   "%s added global %d min. RESV for [%s] [%s]",
                                   get_oper_name(source_p), temp_time / 60,
                                   name, reason);
            ilog(L_KLINE, "R %s %d %s %s",
                 get_oper_name(source_p), temp_time / 60, name, reason);
            sendto_one_notice(source_p, ":Added global %d min. RESV [%s]",
                              temp_time / 60, name);
            sendto_server(NULL, NULL, CAP_BAN|CAP_TS6, NOCAPS,
                          ":%s BAN R * %s %lu %d %d * :%s",
                          source_p->id, aconf->host,
                          (unsigned long)aconf->created,
                          (int)(aconf->hold - aconf->created),
                          (int)(aconf->lifetime - aconf->created),
                          reason);
        } else if(temp_time > 0) {
            aconf->hold = rb_current_time() + temp_time;

            sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                   "%s added temporary %d min. RESV for [%s] [%s]",
                                   get_oper_name(source_p), temp_time / 60,
                                   name, reason);
            ilog(L_KLINE, "R %s %d %s %s",
                 get_oper_name(source_p), temp_time / 60, name, reason);
            sendto_one_notice(source_p, ":Added temporary %d min. RESV [%s]",
                              temp_time / 60, name);
        } else {
            sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                   "%s added RESV for [%s] [%s]",
                                   get_oper_name(source_p), name, reason);
            ilog(L_KLINE, "R %s 0 %s %s",
                 get_oper_name(source_p), name, reason);
            sendto_one_notice(source_p, ":Added RESV [%s]", name);

            bandb_add(BANDB_RESV, source_p, aconf->host, NULL, aconf->passwd, NULL, 0);
        }

        add_to_resv_hash(aconf->host, aconf);
        resv_chan_forcepart(aconf->host, aconf->passwd, temp_time);
    } else if(clean_resv_nick(name)) {
        if(strlen(name) > NICKLEN * 2) {
            sendto_one_notice(source_p, ":Invalid RESV length: %s", name);
            return;
        }

        if(strchr(reason, '"')) {
            sendto_one_notice(source_p, ":Invalid character '\"' in comment");
            return;
        }

        if(!valid_wild_card_simple(name)) {
            sendto_one_notice(source_p,
                              ":Please include at least %d non-wildcard "
                              "characters with the resv",
                              ConfigFileEntry.min_nonwildcard_simple);
            return;
        }

        if(find_nick_resv_mask(name)) {
            sendto_one_notice(source_p,
                              ":A RESV has already been placed on nick: %s", name);
            return;
        }

        aconf = make_conf();
        aconf->status = CONF_RESV_NICK;
        aconf->port = 0;
        aconf->created = rb_current_time();
        aconf->host = rb_strdup(name);
        aconf->passwd = rb_strdup(reason);
        aconf->info.oper = operhash_add(get_oper_name(source_p));

        if(propagated) {
            aconf->flags |= CONF_FLAGS_MYOPER | CONF_FLAGS_TEMPORARY;
            aconf->hold = rb_current_time() + temp_time;
            aconf->lifetime = aconf->hold;
            replace_old_ban(aconf);
            rb_dlinkAddAlloc(aconf, &prop_bans);

            sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                   "%s added global %d min. RESV for [%s] [%s]",
                                   get_oper_name(source_p), temp_time / 60,
                                   name, reason);
            ilog(L_KLINE, "R %s %d %s %s",
                 get_oper_name(source_p), temp_time / 60, name, reason);
            sendto_one_notice(source_p, ":Added global %d min. RESV [%s]",
                              temp_time / 60, name);
            sendto_server(NULL, NULL, CAP_BAN|CAP_TS6, NOCAPS,
                          ":%s BAN R * %s %lu %d %d * :%s",
                          source_p->id, aconf->host,
                          (unsigned long)aconf->created,
                          (int)(aconf->hold - aconf->created),
                          (int)(aconf->lifetime - aconf->created),
                          reason);
        } else if(temp_time > 0) {
            aconf->hold = rb_current_time() + temp_time;

            sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                   "%s added temporary %d min. RESV for [%s] [%s]",
                                   get_oper_name(source_p), temp_time / 60,
                                   name, reason);
            ilog(L_KLINE, "R %s %d %s %s",
                 get_oper_name(source_p), temp_time / 60, name, reason);
            sendto_one_notice(source_p, ":Added temporary %d min. RESV [%s]",
                              temp_time / 60, name);
        } else {
            sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                   "%s added RESV for [%s] [%s]",
                                   get_oper_name(source_p), name, reason);
            ilog(L_KLINE, "R %s 0 %s %s",
                 get_oper_name(source_p), name, reason);
            sendto_one_notice(source_p, ":Added RESV [%s]", name);

            bandb_add(BANDB_RESV, source_p, aconf->host, NULL, aconf->passwd, NULL, 0);
        }

        rb_dlinkAddAlloc(aconf, &resv_conf_list);
    } else
        sendto_one_notice(source_p, ":You have specified an invalid resv: [%s]", name);
}

static void
propagate_resv(struct Client *source_p, const char *target,
               int temp_time, const char *name, const char *reason)
{
    if(!temp_time) {
        sendto_match_servs(source_p, target,
                           CAP_CLUSTER, NOCAPS, "RESV %s %s :%s", target, name, reason);
        sendto_match_servs(source_p, target,
                           CAP_ENCAP, CAP_CLUSTER,
                           "ENCAP %s RESV %d %s 0 :%s", target, temp_time, name, reason);
    } else
        sendto_match_servs(source_p, target,
                           CAP_ENCAP, NOCAPS,
                           "ENCAP %s RESV %d %s 0 :%s", target, temp_time, name, reason);
}

static void
cluster_resv(struct Client *source_p, int temp_time, const char *name, const char *reason)
{
    struct remote_conf *shared_p;
    rb_dlink_node *ptr;

    RB_DLINK_FOREACH(ptr, cluster_conf_list.head) {
        shared_p = ptr->data;

        /* old protocol cant handle temps, and we dont really want
         * to convert them to perm.. --fl
         */
        if(!temp_time) {
            if(!(shared_p->flags & SHARED_PRESV))
                continue;

            sendto_match_servs(source_p, shared_p->server,
                               CAP_CLUSTER, NOCAPS,
                               "RESV %s %s :%s", shared_p->server, name, reason);
            sendto_match_servs(source_p, shared_p->server,
                               CAP_ENCAP, CAP_CLUSTER,
                               "ENCAP %s RESV 0 %s 0 :%s",
                               shared_p->server, name, reason);
        } else if(shared_p->flags & SHARED_TRESV)
            sendto_match_servs(source_p, shared_p->server,
                               CAP_ENCAP, NOCAPS,
                               "ENCAP %s RESV %d %s 0 :%s",
                               shared_p->server, temp_time, name, reason);
    }
}


/*
 * mo_unresv()
 *     parv[0] = sender prefix
 *     parv[1] = channel/nick to unforbid
 */
static int
mo_unresv(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    int propagated = 1;

    if(!IsOperResv(source_p)) {
        sendto_one(source_p, form_str(ERR_NOPRIVS), me.name, source_p->name, "resv");
        return 0;
    }

    if((parc == 4) && (irccmp(parv[2], "ON") == 0)) {
        if(!IsOperRemoteBan(source_p)) {
            sendto_one(source_p, form_str(ERR_NOPRIVS),
                       me.name, source_p->name, "remoteban");
            return 0;
        }

        propagate_generic(source_p, "UNRESV", parv[3], CAP_CLUSTER, "%s", parv[1]);

        if(match(parv[3], me.name) == 0)
            return 0;

        propagated = 0;
    }
#if 0
    else if(rb_dlink_list_length(&cluster_conf_list) > 0)
        cluster_generic(source_p, "UNRESV", SHARED_UNRESV, CAP_CLUSTER, "%s", parv[1]);
#endif
    /* cluster{} moved to remove_resv */

    remove_resv(source_p, parv[1], propagated);
    return 0;
}

/* ms_unresv()
 *     parv[0] = sender prefix
 *     parv[1] = target server
 *     parv[2] = resv to remove
 */
static int
ms_unresv(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    /* parv[0]  parv[1]        parv[2]
     * oper     target server  resv to remove
     */
    propagate_generic(source_p, "UNRESV", parv[1], CAP_CLUSTER, "%s", parv[2]);

    if(!match(parv[1], me.name))
        return 0;

    if(!IsPerson(source_p))
        return 0;

    handle_remote_unresv(source_p, parv[2]);
    return 0;
}

static int
me_unresv(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    /* name */
    if(!IsPerson(source_p))
        return 0;

    handle_remote_unresv(source_p, parv[1]);
    return 0;
}

static void
handle_remote_unresv(struct Client *source_p, const char *name)
{
    if(!find_shared_conf(source_p->username, source_p->host,
                         source_p->servptr->name, SHARED_UNRESV))
        return;

    remove_resv(source_p, name, 0);

    return;
}

static void
remove_resv(struct Client *source_p, const char *name, int propagated)
{
    struct ConfItem *aconf = NULL;
    rb_dlink_node *ptr;

    if(IsChannelName(name)) {
        if((aconf = hash_find_resv(name)) == NULL) {
            if(propagated && rb_dlink_list_length(&cluster_conf_list))
                cluster_generic(source_p, "UNXLINE", SHARED_UNXLINE, CAP_CLUSTER, "%s", name);

            sendto_one_notice(source_p, ":No RESV for %s", name);
            return;
        }

        if(aconf->lifetime) {
            if(!propagated) {
                sendto_one_notice(source_p, ":Cannot remove global RESV %s on specific servers", name);
                return;
            }
            ptr = rb_dlinkFind(aconf, &prop_bans);
            if(ptr == NULL)
                return;
            sendto_one_notice(source_p, ":RESV for [%s] is removed", name);
            sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                   "%s has removed the global RESV for: [%s]",
                                   get_oper_name(source_p), name);
            ilog(L_KLINE, "UR %s %s", get_oper_name(source_p), name);
            if(aconf->created < rb_current_time())
                aconf->created = rb_current_time();
            else
                aconf->created++;
            aconf->hold = aconf->created;
            operhash_delete(aconf->info.oper);
            aconf->info.oper = operhash_add(get_oper_name(source_p));
            aconf->flags |= CONF_FLAGS_MYOPER | CONF_FLAGS_TEMPORARY;
            sendto_server(NULL, NULL, CAP_BAN|CAP_TS6, NOCAPS,
                          ":%s BAN R * %s %lu %d %d * :*",
                          source_p->id, aconf->host,
                          (unsigned long)aconf->created,
                          0,
                          (int)(aconf->lifetime - aconf->created));
            deactivate_conf(aconf, ptr);
            return;
        } else if(propagated && rb_dlink_list_length(&cluster_conf_list) > 0)
            cluster_generic(source_p, "UNRESV", SHARED_UNRESV, CAP_CLUSTER, "%s", name);

        sendto_one_notice(source_p, ":RESV for [%s] is removed", name);
        ilog(L_KLINE, "UR %s %s", get_oper_name(source_p), name);
        if(!aconf->hold) {
            bandb_del(BANDB_RESV, aconf->host, NULL);
            sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                   "%s has removed the RESV for: [%s]",
                                   get_oper_name(source_p), name);
        } else {
            sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                   "%s has removed the temporary RESV for: [%s]",
                                   get_oper_name(source_p), name);
        }
        del_from_resv_hash(name, aconf);
    } else {
        RB_DLINK_FOREACH(ptr, resv_conf_list.head) {
            aconf = ptr->data;

            if(irccmp(aconf->host, name))
                aconf = NULL;
            else
                break;
        }

        if(aconf == NULL) {
            if(propagated && rb_dlink_list_length(&cluster_conf_list))
                cluster_generic(source_p, "UNXLINE", SHARED_UNXLINE, CAP_CLUSTER, "%s", name);

            sendto_one_notice(source_p, ":No RESV for %s", name);
            return;
        }

        if(aconf->lifetime) {
            if(!propagated) {
                sendto_one_notice(source_p, ":Cannot remove global RESV %s on specific servers", name);
                return;
            }
            ptr = rb_dlinkFind(aconf, &prop_bans);
            if(ptr == NULL)
                return;
            sendto_one_notice(source_p, ":RESV for [%s] is removed", name);
            sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                   "%s has removed the global RESV for: [%s]",
                                   get_oper_name(source_p), name);
            ilog(L_KLINE, "UR %s %s", get_oper_name(source_p), name);
            if(aconf->created < rb_current_time())
                aconf->created = rb_current_time();
            else
                aconf->created++;
            aconf->hold = aconf->created;
            operhash_delete(aconf->info.oper);
            aconf->info.oper = operhash_add(get_oper_name(source_p));
            aconf->flags |= CONF_FLAGS_MYOPER | CONF_FLAGS_TEMPORARY;
            sendto_server(NULL, NULL, CAP_BAN|CAP_TS6, NOCAPS,
                          ":%s BAN R * %s %lu %d %d * :*",
                          source_p->id, aconf->host,
                          (unsigned long)aconf->created,
                          0,
                          (int)(aconf->lifetime - aconf->created));
            deactivate_conf(aconf, ptr);
            return;
        } else if(propagated && rb_dlink_list_length(&cluster_conf_list) > 0)
            cluster_generic(source_p, "UNRESV", SHARED_UNRESV, CAP_CLUSTER, "%s", name);

        sendto_one_notice(source_p, ":RESV for [%s] is removed", name);
        ilog(L_KLINE, "UR %s %s", get_oper_name(source_p), name);
        if(!aconf->hold) {
            bandb_del(BANDB_RESV, aconf->host, NULL);
            sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                   "%s has removed the RESV for: [%s]",
                                   get_oper_name(source_p), name);
        } else {
            sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                   "%s has removed the temporary RESV for: [%s]",
                                   get_oper_name(source_p), name);
        }
        /* already have ptr from the loop above.. */
        rb_dlinkDestroy(ptr, &resv_conf_list);
    }
    free_conf(aconf);

    return;
}
