/*
 *  ircd-ratbox: A slightly useful ircd.
 *  m_rehash.c: Re-reads the configuration file.
 *
 *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
 *  Copyright (C) 1996-2002 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
 *
 */

#include "stdinc.h"
#include "client.h"
#include "channel.h"
#include "common.h"
#include "match.h"
#include "ircd.h"
#include "s_serv.h"
#include "numeric.h"
#include "res.h"
#include "s_conf.h"
#include "s_newconf.h"
#include "logger.h"
#include "send.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"
#include "hostmask.h"
#include "reject.h"
#include "hash.h"
#include "cache.h"

static int mo_rehash(struct Client *, struct Client *, int, const char **);
static int me_rehash(struct Client *, struct Client *, int, const char **);

struct Message rehash_msgtab = {
    "REHASH", 0, 0, 0, MFLG_SLOW,
    {mg_unreg, mg_not_oper, mg_ignore, mg_ignore, {me_rehash, 0}, {mo_rehash, 0}}
};

mapi_clist_av1 rehash_clist[] = { &rehash_msgtab, NULL };
DECLARE_MODULE_AV1(rehash, NULL, NULL, rehash_clist, NULL, NULL, "$Revision: 3161 $");

struct hash_commands {
    const char *cmd;
    void (*handler) (struct Client * source_p);
};

static void
rehash_bans_loc(struct Client *source_p)
{
    sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s is rehashing bans",
                           get_oper_name(source_p));
    if (!MyConnect(source_p))
        remote_rehash_oper_p = source_p;

    rehash_bans(0);
}

static void
rehash_dns(struct Client *source_p)
{
    sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s is rehashing DNS",
                           get_oper_name(source_p));
    if (!MyConnect(source_p))
        remote_rehash_oper_p = source_p;

    /* reread /etc/resolv.conf and reopen res socket */
    restart_resolver();
}

static void
rehash_motd(struct Client *source_p)
{
    sendto_realops_snomask(SNO_GENERAL, L_ALL,
                           "%s is forcing re-reading of MOTD file",
                           get_oper_name(source_p));
    if (!MyConnect(source_p))
        remote_rehash_oper_p = source_p;

    cache_user_motd();
}

static void
rehash_omotd(struct Client *source_p)
{
    sendto_realops_snomask(SNO_GENERAL, L_ALL,
                           "%s is forcing re-reading of OPER MOTD file",
                           get_oper_name(source_p));
    if (!MyConnect(source_p))
        remote_rehash_oper_p = source_p;

    free_cachefile(oper_motd);
    oper_motd = cache_file(OPATH, "opers.motd", 0);
}

static void
rehash_tklines(struct Client *source_p)
{
    struct ConfItem *aconf;
    rb_dlink_node *ptr, *next_ptr;
    int i;

    sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s is clearing temp klines",
                           get_oper_name(source_p));
    if (!MyConnect(source_p))
        remote_rehash_oper_p = source_p;

    for(i = 0; i < LAST_TEMP_TYPE; i++) {
        RB_DLINK_FOREACH_SAFE(ptr, next_ptr, temp_klines[i].head) {
            aconf = ptr->data;

            delete_one_address_conf(aconf->host, aconf);
            rb_dlinkDestroy(ptr, &temp_klines[i]);
        }
    }
}

static void
rehash_tdlines(struct Client *source_p)
{
    struct ConfItem *aconf;
    rb_dlink_node *ptr, *next_ptr;
    int i;

    sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s is clearing temp dlines",
                           get_oper_name(source_p));
    if (!MyConnect(source_p))
        remote_rehash_oper_p = source_p;

    for(i = 0; i < LAST_TEMP_TYPE; i++) {
        RB_DLINK_FOREACH_SAFE(ptr, next_ptr, temp_dlines[i].head) {
            aconf = ptr->data;

            delete_one_address_conf(aconf->host, aconf);
            rb_dlinkDestroy(ptr, &temp_dlines[i]);
        }
    }
}

static void
rehash_txlines(struct Client *source_p)
{
    struct ConfItem *aconf;
    rb_dlink_node *ptr;
    rb_dlink_node *next_ptr;

    sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s is clearing temp xlines",
                           get_oper_name(source_p));
    if (!MyConnect(source_p))
        remote_rehash_oper_p = source_p;

    RB_DLINK_FOREACH_SAFE(ptr, next_ptr, xline_conf_list.head) {
        aconf = ptr->data;

        if(!aconf->hold || aconf->lifetime)
            continue;

        free_conf(aconf);
        rb_dlinkDestroy(ptr, &xline_conf_list);
    }
}

static void
rehash_tresvs(struct Client *source_p)
{
    struct ConfItem *aconf;
    rb_dlink_node *ptr;
    rb_dlink_node *next_ptr;
    int i;

    sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s is clearing temp resvs",
                           get_oper_name(source_p));
    if (!MyConnect(source_p))
        remote_rehash_oper_p = source_p;

    HASH_WALK_SAFE(i, R_MAX, ptr, next_ptr, resvTable) {
        aconf = ptr->data;

        if(!aconf->hold || aconf->lifetime)
            continue;

        free_conf(aconf);
        rb_dlinkDestroy(ptr, &resvTable[i]);
    }
    HASH_WALK_END

    RB_DLINK_FOREACH_SAFE(ptr, next_ptr, resv_conf_list.head) {
        aconf = ptr->data;

        if(!aconf->hold || aconf->lifetime)
            continue;

        free_conf(aconf);
        rb_dlinkDestroy(ptr, &resv_conf_list);
    }
}

static void
rehash_rejectcache(struct Client *source_p)
{
    sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s is clearing reject cache",
                           get_oper_name(source_p));
    if (!MyConnect(source_p))
        remote_rehash_oper_p = source_p;
    flush_reject();

}

static void
rehash_throttles(struct Client *source_p)
{
    sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s is clearing throttles",
                           get_oper_name(source_p));
    if (!MyConnect(source_p))
        remote_rehash_oper_p = source_p;
    flush_throttle();

}

static void
rehash_help(struct Client *source_p)
{
    sendto_realops_snomask(SNO_GENERAL, L_ALL,
                           "%s is forcing re-reading of HELP files",
                           get_oper_name(source_p));
    if (!MyConnect(source_p))
        remote_rehash_oper_p = source_p;
    load_help();
}

static void
rehash_nickdelay(struct Client *source_p)
{
    struct nd_entry *nd;
    rb_dlink_node *ptr;
    rb_dlink_node *safe_ptr;

    sendto_realops_snomask(SNO_GENERAL, L_ALL,
                           "%s is clearing the nick delay table",
                           get_oper_name(source_p));
    if (!MyConnect(source_p))
        remote_rehash_oper_p = source_p;

    RB_DLINK_FOREACH_SAFE(ptr, safe_ptr, nd_list.head) {
        nd = ptr->data;

        free_nd_entry(nd);
    }
}

/* *INDENT-OFF* */
static struct hash_commands rehash_commands[] = {
    {"BANS",	rehash_bans_loc		},
    {"DNS", 	rehash_dns		},
    {"MOTD", 	rehash_motd		},
    {"OMOTD", 	rehash_omotd		},
    {"TKLINES", 	rehash_tklines		},
    {"TDLINES", 	rehash_tdlines		},
    {"TXLINES",	rehash_txlines		},
    {"TRESVS",	rehash_tresvs		},
    {"REJECTCACHE",	rehash_rejectcache	},
    {"THROTTLES",	rehash_throttles	},
    {"HELP", 	rehash_help		},
    {"NICKDELAY",	rehash_nickdelay        },
    {NULL, 		NULL 			}
};
/* *INDENT-ON* */

static void
do_rehash(struct Client *source_p, const char *type)
{
    if (type != NULL) {
        int x;
        char cmdbuf[100];

        for (x = 0; rehash_commands[x].cmd != NULL && rehash_commands[x].handler != NULL;
             x++) {
            if(irccmp(type, rehash_commands[x].cmd) == 0) {
                sendto_one(source_p, form_str(RPL_REHASHING), me.name,
                           source_p->name, rehash_commands[x].cmd);
                ilog(L_MAIN, "REHASH %s From %s[%s]", type,
                     get_oper_name(source_p), source_p->sockhost);
                rehash_commands[x].handler(source_p);
                remote_rehash_oper_p = NULL;
                return;
            }
        }

        /* We are still here..we didn't match */
        cmdbuf[0] = '\0';
        for (x = 0; rehash_commands[x].cmd != NULL && rehash_commands[x].handler != NULL;
             x++) {
            rb_strlcat(cmdbuf, " ", sizeof(cmdbuf));
            rb_strlcat(cmdbuf, rehash_commands[x].cmd, sizeof(cmdbuf));
        }
        sendto_one_notice(source_p, ":rehash one of:%s", cmdbuf);
    } else {
        sendto_one(source_p, form_str(RPL_REHASHING), me.name, source_p->name,
                   ConfigFileEntry.configfile);
        sendto_realops_snomask(SNO_GENERAL, L_ALL,
                               "%s is rehashing server config file", get_oper_name(source_p));
        if (!MyConnect(source_p))
            remote_rehash_oper_p = source_p;
        ilog(L_MAIN, "REHASH From %s[%s]", get_oper_name(source_p),
             source_p->sockhost);
        rehash(0);
        remote_rehash_oper_p = NULL;
    }
}

/*
 * mo_rehash - REHASH message handler
 *
 * parv[1] = rehash type or destination
 * parv[2] = destination
 */
static int
mo_rehash(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    const char *type = NULL, *target_server = NULL;

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

    if (parc > 2)
        type = parv[1], target_server = parv[2];
    else if (parc > 1 && (strchr(parv[1], '.') || strchr(parv[1], '?') || strchr(parv[1], '*')))
        type = NULL, target_server = parv[1];
    else if (parc > 1)
        type = parv[1], target_server = NULL;
    else
        type = NULL, target_server = NULL;

    if (target_server != NULL) {
        if(!IsOperRemoteBan(source_p)) {
            sendto_one(source_p, form_str(ERR_NOPRIVS),
                       me.name, source_p->name, "remoteban");
            return 0;
        }
        sendto_match_servs(source_p, target_server,
                           CAP_ENCAP, NOCAPS,
                           "ENCAP %s REHASH %s",
                           target_server, type != NULL ? type : "");
        if (match(target_server, me.name) == 0)
            return 0;
    }

    do_rehash(source_p, type);

    return 0;
}

static int
me_rehash(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{

    if (!IsPerson(source_p))
        return 0;

    if (!find_shared_conf(source_p->username, source_p->host,
                          source_p->servptr->name, SHARED_REHASH))
        return 0;

    do_rehash(source_p, parc > 1 ? parv[1] : NULL);

    return 0;
}