Automated merge with ssh://hg.atheme.org//hg/charybdis

[irc/rqf/shadowircd.git] / src / s_conf.c

/*
 *  ircd-ratbox: A slightly useful ircd.
 *  s_conf.c: Configuration file functions.
 *
 *  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
 *
 *  $Id: s_conf.c 3550 2007-08-09 06:47:26Z nenolod $
 */

#include "stdinc.h"
#include "ircd_defs.h"
#include "tools.h"
#include "s_conf.h"
#include "s_newconf.h"
#include "s_serv.h"
#include "s_stats.h"
#include "channel.h"
#include "class.h"
#include "client.h"
#include "common.h"
#include "event.h"
#include "hash.h"
#include "irc_string.h"
#include "sprintf_irc.h"
#include "ircd.h"
#include "listener.h"
#include "hostmask.h"
#include "modules.h"
#include "numeric.h"
#include "commio.h"
#include "s_log.h"
#include "send.h"
#include "s_gline.h"
#include "memory.h"
#include "balloc.h"
#include "patricia.h"
#include "reject.h"
#include "cache.h"
#include "blacklist.h"

struct config_server_hide ConfigServerHide;

extern int yyparse();           /* defined in y.tab.c */
extern char linebuf[];

#ifndef INADDR_NONE
#define INADDR_NONE ((unsigned int) 0xffffffff)
#endif

static BlockHeap *confitem_heap = NULL;

dlink_list temp_klines[LAST_TEMP_TYPE];
dlink_list temp_dlines[LAST_TEMP_TYPE];
dlink_list service_list;

/* internally defined functions */
static void set_default_conf(void);
static void validate_conf(void);
static void read_conf(FILE *);
static void clear_out_old_conf(void);

static void expire_temp_kd(void *list);
static void reorganise_temp_kd(void *list);

FILE *conf_fbfile_in;
extern char yytext[];

static int verify_access(struct Client *client_p, const char *username);
static int attach_iline(struct Client *, struct ConfItem *);

void
init_s_conf(void)
{
        confitem_heap = BlockHeapCreate(sizeof(struct ConfItem), CONFITEM_HEAP_SIZE);

        eventAddIsh("expire_temp_klines", expire_temp_kd, &temp_klines[TEMP_MIN], 60);
        eventAddIsh("expire_temp_dlines", expire_temp_kd, &temp_dlines[TEMP_MIN], 60);

        eventAddIsh("expire_temp_klines_hour", reorganise_temp_kd,
                        &temp_klines[TEMP_HOUR], 3600);
        eventAddIsh("expire_temp_dlines_hour", reorganise_temp_kd,
                        &temp_dlines[TEMP_HOUR], 3600);
        eventAddIsh("expire_temp_klines_day", reorganise_temp_kd,
                        &temp_klines[TEMP_DAY], 86400);
        eventAddIsh("expire_temp_dlines_day", reorganise_temp_kd,
                        &temp_dlines[TEMP_DAY], 86400);
        eventAddIsh("expire_temp_klines_week", reorganise_temp_kd,
                        &temp_klines[TEMP_WEEK], 604800);
        eventAddIsh("expire_temp_dlines_week", reorganise_temp_kd,
                        &temp_dlines[TEMP_WEEK], 604800);
}

/*
 * make_conf
 *
 * inputs       - none
 * output       - pointer to new conf entry
 * side effects - none
 */
struct ConfItem *
make_conf()
{
        struct ConfItem *aconf;

        aconf = BlockHeapAlloc(confitem_heap);
        aconf->status = CONF_ILLEGAL;
        return (aconf);
}

/*
 * free_conf
 *
 * inputs       - pointer to conf to free
 * output       - none
 * side effects - crucial password fields are zeroed, conf is freed
 */
void
free_conf(struct ConfItem *aconf)
{
        s_assert(aconf != NULL);
        if(aconf == NULL)
                return;

        /* security.. */
        if(aconf->passwd)
                memset(aconf->passwd, 0, strlen(aconf->passwd));
        if(aconf->spasswd)
                memset(aconf->spasswd, 0, strlen(aconf->spasswd));

        MyFree(aconf->passwd);
        MyFree(aconf->spasswd);
        MyFree(aconf->name);
        MyFree(aconf->className);
        MyFree(aconf->user);
        MyFree(aconf->host);

        BlockHeapFree(confitem_heap, aconf);
}

/*
 * check_client
 *
 * inputs       - pointer to client
 * output       - 0 = Success
 *                NOT_AUTHORISED (-1) = Access denied (no I line match)
 *                SOCKET_ERROR   (-2) = Bad socket.
 *                I_LINE_FULL    (-3) = I-line is full
 *                TOO_MANY       (-4) = Too many connections from hostname
 *                BANNED_CLIENT  (-5) = K-lined
 * side effects - Ordinary client access check.
 *                Look for conf lines which have the same
 *                status as the flags passed.
 */
int
check_client(struct Client *client_p, struct Client *source_p, const char *username)
{
        int i;

        ClearAccess(source_p);

        if((i = verify_access(source_p, username)))
        {
                ilog(L_FUSER, "Access denied: %s[%s]", 
                     source_p->name, source_p->sockhost);
        }
        
        switch (i)
        {
        case SOCKET_ERROR:
                exit_client(client_p, source_p, &me, "Socket Error");
                break;

        case TOO_MANY_LOCAL:
                /* Note that these notices are sent to opers on other
                 * servers also, so even if local opers are allowed to
                 * see the IP, we still cannot send it.
                 */
                sendto_realops_snomask(SNO_FULL, L_NETWIDE,
                                "Too many local connections for %s!%s%s@%s",
                                source_p->name, IsGotId(source_p) ? "" : "~",
                                source_p->username,
                                show_ip(NULL, source_p) && !IsIPSpoof(source_p) ? source_p->sockhost : source_p->host);

                ilog(L_FUSER, "Too many local connections from %s!%s%s@%s",
                        source_p->name, IsGotId(source_p) ? "" : "~",
                        source_p->username, source_p->sockhost);        

                ServerStats->is_ref++;
                exit_client(client_p, source_p, &me, "Too many host connections (local)");
                break;

        case TOO_MANY_GLOBAL:
                sendto_realops_snomask(SNO_FULL, L_NETWIDE,
                                "Too many global connections for %s!%s%s@%s",
                                source_p->name, IsGotId(source_p) ? "" : "~",
                                source_p->username,
                                show_ip(NULL, source_p) && !IsIPSpoof(source_p) ? source_p->sockhost : source_p->host);
                ilog(L_FUSER, "Too many global connections from %s!%s%s@%s",
                        source_p->name, IsGotId(source_p) ? "" : "~",
                        source_p->username, source_p->sockhost);

                ServerStats->is_ref++;
                exit_client(client_p, source_p, &me, "Too many host connections (global)");
                break;

        case TOO_MANY_IDENT:
                sendto_realops_snomask(SNO_FULL, L_NETWIDE,
                                "Too many user connections for %s!%s%s@%s",
                                source_p->name, IsGotId(source_p) ? "" : "~",
                                source_p->username,
                                show_ip(NULL, source_p) && !IsIPSpoof(source_p) ? source_p->sockhost : source_p->host);
                ilog(L_FUSER, "Too many user connections from %s!%s%s@%s",
                        source_p->name, IsGotId(source_p) ? "" : "~",
                        source_p->username, source_p->sockhost);

                ServerStats->is_ref++;
                exit_client(client_p, source_p, &me, "Too many user connections (global)");
                break;

        case I_LINE_FULL:
                sendto_realops_snomask(SNO_FULL, L_NETWIDE,
                                "I-line is full for %s!%s%s@%s (%s).",
                                source_p->name, IsGotId(source_p) ? "" : "~",
                                source_p->username, source_p->host,
                                show_ip(NULL, source_p) && !IsIPSpoof(source_p) ? source_p->sockhost : "255.255.255.255");

                ilog(L_FUSER, "Too many connections from %s!%s%s@%s.", 
                        source_p->name, IsGotId(source_p) ? "" : "~",
                        source_p->username, source_p->sockhost);

                ServerStats->is_ref++;
                exit_client(client_p, source_p, &me,
                            "No more connections allowed in your connection class");
                break;

        case NOT_AUTHORISED:
                {
                        int port = -1;
#ifdef IPV6
                        if(source_p->localClient->ip.ss_family == AF_INET6)
                                port = ntohs(((struct sockaddr_in6 *)&source_p->localClient->listener->addr)->sin6_port);
                        else
#endif
                                port = ntohs(((struct sockaddr_in *)&source_p->localClient->listener->addr)->sin_port);
                        
                        ServerStats->is_ref++;
                        /* jdc - lists server name & port connections are on */
                        /*       a purely cosmetical change */
                        /* why ipaddr, and not just source_p->sockhost? --fl */
#if 0
                        static char ipaddr[HOSTIPLEN];
                        inetntop_sock(&source_p->localClient->ip, ipaddr, sizeof(ipaddr));
#endif
                        sendto_realops_snomask(SNO_UNAUTH, L_ALL,
                                        "Unauthorised client connection from "
                                        "%s!%s%s@%s [%s] on [%s/%u].",
                                        source_p->name, IsGotId(source_p) ? "" : "~",
                                        source_p->username, source_p->host,
                                        source_p->sockhost,
                                        source_p->localClient->listener->name, port);

                        ilog(L_FUSER,
                                "Unauthorised client connection from %s!%s%s@%s on [%s/%u].",
                                source_p->name, IsGotId(source_p) ? "" : "~",
                                source_p->username, source_p->sockhost,
                                source_p->localClient->listener->name, port);
                        add_reject(client_p);
                        exit_client(client_p, source_p, &me,
                                    "You are not authorised to use this server");
                        break;
                }
        case BANNED_CLIENT:
                add_reject(client_p);
                exit_client(client_p, client_p, &me, "*** Banned ");
                ServerStats->is_ref++;
                break;

        case 0:
        default:
                break;
        }
        return (i);
}

/*
 * verify_access
 *
 * inputs       - pointer to client to verify
 *              - pointer to proposed username
 * output       - 0 if success -'ve if not
 * side effect  - find the first (best) I line to attach.
 */
static int
verify_access(struct Client *client_p, const char *username)
{
        struct ConfItem *aconf;
        char non_ident[USERLEN + 1];

        if(IsGotId(client_p))
        {
                aconf = find_address_conf(client_p->host, client_p->sockhost, 
                                        client_p->username, client_p->username,
                                        (struct sockaddr *) &client_p->localClient->ip,
                                        client_p->localClient->ip.ss_family);
        }
        else
        {
                strlcpy(non_ident, "~", sizeof(non_ident));
                strlcat(non_ident, username, sizeof(non_ident));
                aconf = find_address_conf(client_p->host, client_p->sockhost,
                                        non_ident, client_p->username,
                                        (struct sockaddr *) &client_p->localClient->ip,
                                        client_p->localClient->ip.ss_family);
        }

        if(aconf == NULL)
                return NOT_AUTHORISED;

        if(aconf->status & CONF_CLIENT)
        {
                if(aconf->flags & CONF_FLAGS_REDIR)
                {
                        sendto_one_numeric(client_p, RPL_REDIR, form_str(RPL_REDIR),
                                        aconf->name ? aconf->name : "", aconf->port);
                        return (NOT_AUTHORISED);
                }


                if(IsConfDoIdentd(aconf))
                        SetNeedId(client_p);

                /* Thanks for spoof idea amm */
                if(IsConfDoSpoofIp(aconf))
                {
                        char *p;

                        /* show_ip() depends on this --fl */
                        SetIPSpoof(client_p);

                        if(IsConfSpoofNotice(aconf))
                        {
                                sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                                "%s spoofing: %s as %s",
                                                client_p->name,
                                                show_ip(NULL, client_p) ? client_p->host : aconf->name,
                                                aconf->name);
                        }

                        /* user@host spoof */
                        if((p = strchr(aconf->name, '@')) != NULL)
                        {
                                char *host = p+1;
                                *p = '\0';

                                strlcpy(client_p->username, aconf->name,
                                        sizeof(client_p->username));
                                strlcpy(client_p->host, host,
                                        sizeof(client_p->host));
                                *p = '@';
                        }
                        else
                                strlcpy(client_p->host, aconf->name, sizeof(client_p->host));
                }
                return (attach_iline(client_p, aconf));
        }
        else if(aconf->status & CONF_KILL)
        {
                if(ConfigFileEntry.kline_with_reason)
                {
                        sendto_one(client_p,
                                        form_str(ERR_YOUREBANNEDCREEP),
                                        me.name, client_p->name, aconf->passwd);
                }
                return (BANNED_CLIENT);
        }
        else if(aconf->status & CONF_GLINE)
        {
                sendto_one_notice(client_p, ":*** G-lined");

                if(ConfigFileEntry.kline_with_reason)
                        sendto_one(client_p,
                                        form_str(ERR_YOUREBANNEDCREEP),
                                        me.name, client_p->name, aconf->passwd);

                return (BANNED_CLIENT);
        }

        return NOT_AUTHORISED;
}


/*
 * add_ip_limit
 * 
 * Returns 1 if successful 0 if not
 *
 * This checks if the user has exceed the limits for their class
 * unless of course they are exempt..
 */

static int
add_ip_limit(struct Client *client_p, struct ConfItem *aconf)
{
        patricia_node_t *pnode;

        /* If the limits are 0 don't do anything.. */
        if(ConfCidrAmount(aconf) == 0 || ConfCidrBitlen(aconf) == 0)
                return -1;

        pnode = match_ip(ConfIpLimits(aconf), (struct sockaddr *)&client_p->localClient->ip);

        if(pnode == NULL)
                pnode = make_and_lookup_ip(ConfIpLimits(aconf), (struct sockaddr *)&client_p->localClient->ip, ConfCidrBitlen(aconf));

        s_assert(pnode != NULL);

        if(pnode != NULL)
        {
                if(((long) pnode->data) >= ConfCidrAmount(aconf)
                   && !IsConfExemptLimits(aconf))
                {
                        /* This should only happen if the limits are set to 0 */
                        if((unsigned long) pnode->data == 0)
                        {
                                patricia_remove(ConfIpLimits(aconf), pnode);
                        }
                        return (0);
                }

                pnode->data++;
        }
        return 1;
}

static void
remove_ip_limit(struct Client *client_p, struct ConfItem *aconf)
{
        patricia_node_t *pnode;

        /* If the limits are 0 don't do anything.. */
        if(ConfCidrAmount(aconf) == 0 || ConfCidrBitlen(aconf) == 0)
                return;

        pnode = match_ip(ConfIpLimits(aconf), (struct sockaddr *)&client_p->localClient->ip);
        if(pnode == NULL)
                return;

        pnode->data--;
        if(((unsigned long) pnode->data) == 0)
        {
                patricia_remove(ConfIpLimits(aconf), pnode);
        }

}

/*
 * attach_iline
 *
 * inputs       - client pointer
 *              - conf pointer
 * output       -
 * side effects - do actual attach
 */
static int
attach_iline(struct Client *client_p, struct ConfItem *aconf)
{
        struct Client *target_p;
        dlink_node *ptr;
        int local_count = 0;
        int global_count = 0;
        int ident_count = 0;
        int unidented = 0;

        if(IsConfExemptLimits(aconf))
                return (attach_conf(client_p, aconf));

        if(*client_p->username == '~')
                unidented = 1;


        /* find_hostname() returns the head of the list to search */
        DLINK_FOREACH(ptr, find_hostname(client_p->host))
        {
                target_p = ptr->data;

                if(irccmp(client_p->host, target_p->orighost) != 0)
                        continue;

                if(MyConnect(target_p))
                        local_count++;

                global_count++;

                if(unidented)
                {
                        if(*target_p->username == '~')
                                ident_count++;
                }
                else if(irccmp(target_p->username, client_p->username) == 0)
                        ident_count++;

                if(ConfMaxLocal(aconf) && local_count >= ConfMaxLocal(aconf))
                        return (TOO_MANY_LOCAL);
                else if(ConfMaxGlobal(aconf) && global_count >= ConfMaxGlobal(aconf))
                        return (TOO_MANY_GLOBAL);
                else if(ConfMaxIdent(aconf) && ident_count >= ConfMaxIdent(aconf))
                        return (TOO_MANY_IDENT);
        }


        return (attach_conf(client_p, aconf));
}

/*
 * detach_conf
 *
 * inputs       - pointer to client to detach
 * output       - 0 for success, -1 for failure
 * side effects - Disassociate configuration from the client.
 *                Also removes a class from the list if marked for deleting.
 */
int
detach_conf(struct Client *client_p)
{
        struct ConfItem *aconf;

        aconf = client_p->localClient->att_conf;

        if(aconf != NULL)
        {
                if(ClassPtr(aconf))
                {
                        remove_ip_limit(client_p, aconf);

                        if(ConfCurrUsers(aconf) > 0)
                                --ConfCurrUsers(aconf);

                        if(ConfMaxUsers(aconf) == -1 && ConfCurrUsers(aconf) == 0)
                        {
                                free_class(ClassPtr(aconf));
                                ClassPtr(aconf) = NULL;
                        }

                }

                aconf->clients--;
                if(!aconf->clients && IsIllegal(aconf))
                        free_conf(aconf);

                client_p->localClient->att_conf = NULL;
                return 0;
        }

        return -1;
}

/*
 * attach_conf
 * 
 * inputs       - client pointer
 *              - conf pointer
 * output       -
 * side effects - Associate a specific configuration entry to a *local*
 *                client (this is the one which used in accepting the
 *                connection). Note, that this automatically changes the
 *                attachment if there was an old one...
 */
int
attach_conf(struct Client *client_p, struct ConfItem *aconf)
{
        if(IsIllegal(aconf))
                return (NOT_AUTHORISED);

        if(ClassPtr(aconf))
        {
                if(!add_ip_limit(client_p, aconf))
                        return (TOO_MANY_LOCAL);
        }

        if((aconf->status & CONF_CLIENT) &&
           ConfCurrUsers(aconf) >= ConfMaxUsers(aconf) && ConfMaxUsers(aconf) > 0)
        {
                if(!IsConfExemptLimits(aconf))
                {
                        return (I_LINE_FULL);
                }
                else
                {
                        sendto_one_notice(client_p, ":*** I: line is full, but you have an >I: line!");
                        SetExemptLimits(client_p);
                }

        }

        if(client_p->localClient->att_conf != NULL)
                detach_conf(client_p);

        client_p->localClient->att_conf = aconf;

        aconf->clients++;
        ConfCurrUsers(aconf)++;
        return (0);
}

/*
 * rehash
 *
 * Actual REHASH service routine. Called with sig == 0 if it has been called
 * as a result of an operator issuing this command, else assume it has been
 * called as a result of the server receiving a HUP signal.
 */
int
rehash(int sig)
{
        if(sig != 0)
        {
                sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                     "Got signal SIGHUP, reloading ircd conf. file");
        }

        restart_resolver();
        /* don't close listeners until we know we can go ahead with the rehash */
        read_conf_files(NO);

        if(ServerInfo.description != NULL)
                strlcpy(me.info, ServerInfo.description, sizeof(me.info));
        else
                strlcpy(me.info, "unknown", sizeof(me.info));

        open_logfiles();
        return (0);
}

static struct banconf_entry
{
        const char **filename;
        void (*func) (FILE *);
        int perm;
} banconfs[] = {
        { &ConfigFileEntry.klinefile,   parse_k_file,   0 },
        { &ConfigFileEntry.klinefile,   parse_k_file,   1 },
        { &ConfigFileEntry.dlinefile,   parse_d_file,   0 },
        { &ConfigFileEntry.dlinefile,   parse_d_file,   1 },
        { &ConfigFileEntry.xlinefile,   parse_x_file,   0 },
        { &ConfigFileEntry.xlinefile,   parse_x_file,   1 },
        { &ConfigFileEntry.resvfile,    parse_resv_file,0 },
        { &ConfigFileEntry.resvfile,    parse_resv_file,1 },
        { NULL,                         NULL,           0 }
};

void
rehash_bans(int sig)
{
        FILE *file;
        char buf[MAXPATHLEN];
        int i;

        if(sig != 0)
                sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                "Got signal SIGUSR2, reloading ban confs");

        clear_out_address_conf_bans();
        clear_s_newconf_bans();

        for(i = 0; banconfs[i].filename; i++)
        {
                if(banconfs[i].perm)
                        snprintf(buf, sizeof(buf), "%s.perm", *banconfs[i].filename);
                else
                        snprintf(buf, sizeof(buf), "%s", *banconfs[i].filename);

                if((file = fopen(buf, "r")) == NULL)
                {
                        if(banconfs[i].perm)
                                continue;

                        ilog(L_MAIN, "Failed reading ban file %s",
                                *banconfs[i].filename);
                        sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                        "Can't open %s file bans could be missing!",
                                        *banconfs[i].filename);
                }
                else
                {
                        (banconfs[i].func)(file);
                        fclose(file);
                }
        }

        check_banned_lines();
}

/*
 * set_default_conf()
 *
 * inputs       - NONE
 * output       - NONE
 * side effects - Set default values here.
 *                This is called **PRIOR** to parsing the
 *                configuration file.  If you want to do some validation
 *                of values later, put them in validate_conf().
 */

#define YES     1
#define NO      0
#define UNSET  -1

static void
set_default_conf(void)
{
        /* ServerInfo.name is not rehashable */
        /* ServerInfo.name = ServerInfo.name; */
        ServerInfo.description = NULL;
        DupString(ServerInfo.network_name, NETWORK_NAME_DEFAULT);
        DupString(ServerInfo.network_desc, NETWORK_DESC_DEFAULT);

        memset(&ServerInfo.ip, 0, sizeof(ServerInfo.ip));
        ServerInfo.specific_ipv4_vhost = 0;
#ifdef IPV6
        memset(&ServerInfo.ip6, 0, sizeof(ServerInfo.ip6));
        ServerInfo.specific_ipv6_vhost = 0;
#endif

        /* Don't reset hub, as that will break lazylinks */
        /* ServerInfo.hub = NO; */
        AdminInfo.name = NULL;
        AdminInfo.email = NULL;
        AdminInfo.description = NULL;

        DupString(ConfigFileEntry.default_operstring, "is an IRC operator");
        DupString(ConfigFileEntry.default_adminstring, "is a Server Administrator");
        DupString(ConfigFileEntry.servicestring, "is a Network Service");

        ConfigFileEntry.default_umodes = UMODE_INVISIBLE;       
        ConfigFileEntry.failed_oper_notice = YES;
        ConfigFileEntry.anti_nick_flood = NO;
        ConfigFileEntry.disable_fake_channels = NO;
        ConfigFileEntry.max_nick_time = 20;
        ConfigFileEntry.max_nick_changes = 5;
        ConfigFileEntry.max_accept = 20;
        ConfigFileEntry.max_monitor = 60;
        ConfigFileEntry.nick_delay = 900;       /* 15 minutes */
        ConfigFileEntry.target_change = YES;
        ConfigFileEntry.anti_spam_exit_message_time = 0;
        ConfigFileEntry.ts_warn_delta = TS_WARN_DELTA_DEFAULT;
        ConfigFileEntry.ts_max_delta = TS_MAX_DELTA_DEFAULT;
        ConfigFileEntry.client_exit = YES;
        ConfigFileEntry.dline_with_reason = YES;
        ConfigFileEntry.kline_with_reason = YES;
        ConfigFileEntry.kline_delay = 0;
        ConfigFileEntry.warn_no_nline = YES;
        ConfigFileEntry.non_redundant_klines = YES;
        ConfigFileEntry.stats_e_disabled = NO;
        ConfigFileEntry.stats_o_oper_only = NO;
        ConfigFileEntry.stats_k_oper_only = 1;  /* masked */
        ConfigFileEntry.stats_i_oper_only = 1;  /* masked */
        ConfigFileEntry.stats_P_oper_only = NO;
        ConfigFileEntry.stats_c_oper_only = NO;
        ConfigFileEntry.stats_y_oper_only = NO;
        ConfigFileEntry.stats_h_oper_only = NO;
        ConfigFileEntry.map_oper_only = YES;
        ConfigFileEntry.operspy_admin_only = NO;
        ConfigFileEntry.pace_wait = 10;
        ConfigFileEntry.caller_id_wait = 60;
        ConfigFileEntry.pace_wait_simple = 1;
        ConfigFileEntry.short_motd = NO;
        ConfigFileEntry.no_oper_flood = NO;
        ConfigFileEntry.fname_userlog = NULL;
        ConfigFileEntry.fname_fuserlog = NULL;
        ConfigFileEntry.fname_operlog = NULL;
        ConfigFileEntry.fname_foperlog = NULL;
        ConfigFileEntry.fname_serverlog = NULL;
        ConfigFileEntry.fname_glinelog = NULL;
        ConfigFileEntry.fname_klinelog = NULL;
        ConfigFileEntry.fname_operspylog = NULL;
        ConfigFileEntry.fname_ioerrorlog = NULL;
        ConfigFileEntry.glines = NO;
        ConfigFileEntry.use_egd = NO;
        ConfigFileEntry.gline_time = 12 * 3600;
        ConfigFileEntry.gline_min_cidr = 16;
        ConfigFileEntry.gline_min_cidr6 = 48;
        ConfigFileEntry.hide_spoof_ips = YES;
        ConfigFileEntry.hide_error_messages = 1;
        ConfigFileEntry.idletime = 0;
        ConfigFileEntry.dots_in_ident = 0;
        ConfigFileEntry.max_targets = MAX_TARGETS_DEFAULT;
        DupString(ConfigFileEntry.servlink_path, SLPATH);
        ConfigFileEntry.egdpool_path = NULL;
        ConfigFileEntry.use_whois_actually = YES;
        ConfigFileEntry.burst_away = NO;
        ConfigFileEntry.collision_fnc = YES;
        ConfigFileEntry.global_snotices = YES;
        ConfigFileEntry.operspy_dont_care_user_info = NO;

#ifdef HAVE_LIBZ
        ConfigFileEntry.compression_level = 4;
#endif

        ConfigFileEntry.oper_umodes = UMODE_LOCOPS | UMODE_SERVNOTICE |
                UMODE_OPERWALL | UMODE_WALLOP;
        ConfigFileEntry.oper_only_umodes = UMODE_SERVNOTICE;
        ConfigFileEntry.oper_snomask = SNO_GENERAL;

        ConfigChannel.use_except = YES;
        ConfigChannel.use_invex = YES;
        ConfigChannel.use_knock = YES;
        ConfigChannel.use_forward = YES;
        ConfigChannel.knock_delay = 300;
        ConfigChannel.knock_delay_channel = 60;
        ConfigChannel.max_chans_per_user = 15;
        ConfigChannel.max_bans = 25;
        ConfigChannel.max_bans_large = 500;
        ConfigChannel.burst_topicwho = NO;
        ConfigChannel.kick_on_split_riding = NO;

        ConfigChannel.default_split_user_count = 15000;
        ConfigChannel.default_split_server_count = 10;
        ConfigChannel.no_join_on_split = NO;
        ConfigChannel.no_create_on_split = YES;

        ConfigServerHide.flatten_links = 0;
        ConfigServerHide.links_delay = 300;
        ConfigServerHide.hidden = 0;
        ConfigServerHide.disable_hidden = 0;

        ConfigFileEntry.min_nonwildcard = 4;
        ConfigFileEntry.min_nonwildcard_simple = 3;
        ConfigFileEntry.default_floodcount = 8;
        ConfigFileEntry.client_flood = CLIENT_FLOOD_DEFAULT;
        ConfigFileEntry.tkline_expire_notices = 0;

        ConfigFileEntry.reject_after_count = 5;
        ConfigFileEntry.reject_ban_time = 300;  
        ConfigFileEntry.reject_duration = 120;
        ConfigFileEntry.max_unknown_ip = 2;

        ServerInfo.max_clients = comm_get_maxconnections() - MAX_BUFFER;
}

#undef YES
#undef NO

/*
 * read_conf() 
 *
 *
 * inputs       - file descriptor pointing to config file to use
 * output       - None
 * side effects - Read configuration file.
 */
static void
read_conf(FILE * file)
{
        lineno = 0;

        set_default_conf();     /* Set default values prior to conf parsing */
        yyparse();              /* Load the values from the conf */
        validate_conf();        /* Check to make sure some values are still okay. */
        /* Some global values are also loaded here. */
        check_class();          /* Make sure classes are valid */
}

static void
validate_conf(void)
{
        if(ConfigFileEntry.ts_warn_delta < TS_WARN_DELTA_MIN)
                ConfigFileEntry.ts_warn_delta = TS_WARN_DELTA_DEFAULT;

        if(ConfigFileEntry.ts_max_delta < TS_MAX_DELTA_MIN)
                ConfigFileEntry.ts_max_delta = TS_MAX_DELTA_DEFAULT;

        if(ConfigFileEntry.servlink_path == NULL)
                DupString(ConfigFileEntry.servlink_path, SLPATH);

        if(ServerInfo.network_name == NULL)
                DupString(ServerInfo.network_name, NETWORK_NAME_DEFAULT);

        if(ServerInfo.network_desc == NULL)
                DupString(ServerInfo.network_desc, NETWORK_DESC_DEFAULT);

        if((ConfigFileEntry.client_flood < CLIENT_FLOOD_MIN) ||
           (ConfigFileEntry.client_flood > CLIENT_FLOOD_MAX))
                ConfigFileEntry.client_flood = CLIENT_FLOOD_MAX;

        GlobalSetOptions.idletime = (ConfigFileEntry.idletime * 60);

        if(!split_users || !split_servers ||
           (!ConfigChannel.no_create_on_split && !ConfigChannel.no_join_on_split))
        {
                eventDelete(check_splitmode, NULL);
                splitmode = 0;
                splitchecking = 0;
        }
}

/*
 * lookup_confhost - start DNS lookups of all hostnames in the conf
 * line and convert an IP addresses in a.b.c.d number for to IP#s.
 *
 */

/*
 * conf_connect_allowed
 *
 * inputs       - pointer to inaddr
 *              - int type ipv4 or ipv6
 * output       - ban info or NULL
 * side effects - none
 */
struct ConfItem *
conf_connect_allowed(struct sockaddr *addr, int aftype)
{
        struct ConfItem *aconf = find_dline(addr, aftype);

        /* DLINE exempt also gets you out of static limits/pacing... */
        if(aconf && (aconf->status & CONF_EXEMPTDLINE))
                return NULL;

        if(aconf != NULL)
                return aconf;

        return NULL;
}

/* add_temp_kline()
 *
 * inputs        - pointer to struct ConfItem
 * output        - none
 * Side effects  - links in given struct ConfItem into 
 *                 temporary kline link list
 */
void
add_temp_kline(struct ConfItem *aconf)
{
        if(aconf->hold >= CurrentTime + (10080 * 60))
        {
                dlinkAddAlloc(aconf, &temp_klines[TEMP_WEEK]);
                aconf->port = TEMP_WEEK;
        }
        else if(aconf->hold >= CurrentTime + (1440 * 60))
        {
                dlinkAddAlloc(aconf, &temp_klines[TEMP_DAY]);
                aconf->port = TEMP_DAY;
        }
        else if(aconf->hold >= CurrentTime + (60 * 60))
        {
                dlinkAddAlloc(aconf, &temp_klines[TEMP_HOUR]);
                aconf->port = TEMP_HOUR;
        }
        else
        {
                dlinkAddAlloc(aconf, &temp_klines[TEMP_MIN]);
                aconf->port = TEMP_MIN;
        }

        aconf->flags |= CONF_FLAGS_TEMPORARY;
        add_conf_by_address(aconf->host, CONF_KILL, aconf->user, aconf);
}

/* add_temp_dline()
 *
 * input        - pointer to struct ConfItem
 * output       - none
 * side effects - added to tdline link list and address hash
 */
void
add_temp_dline(struct ConfItem *aconf)
{
        if(aconf->hold >= CurrentTime + (10080 * 60))
        {
                dlinkAddAlloc(aconf, &temp_dlines[TEMP_WEEK]);
                aconf->port = TEMP_WEEK;
        }
        else if(aconf->hold >= CurrentTime + (1440 * 60))
        {
                dlinkAddAlloc(aconf, &temp_dlines[TEMP_DAY]);
                aconf->port = TEMP_DAY;
        }
        else if(aconf->hold >= CurrentTime + (60 * 60))
        {
                dlinkAddAlloc(aconf, &temp_dlines[TEMP_HOUR]);
                aconf->port = TEMP_HOUR;
        }
        else
        {
                dlinkAddAlloc(aconf, &temp_dlines[TEMP_MIN]);
                aconf->port = TEMP_MIN;
        }

        aconf->flags |= CONF_FLAGS_TEMPORARY;
        add_conf_by_address(aconf->host, CONF_DLINE, aconf->user, aconf);
}

/* expire_tkline()
 *
 * inputs       - list pointer
 *              - type
 * output       - NONE
 * side effects - expire tklines and moves them between lists
 */
static void
expire_temp_kd(void *list)
{
        dlink_node *ptr;
        dlink_node *next_ptr;
        struct ConfItem *aconf;

        DLINK_FOREACH_SAFE(ptr, next_ptr, ((dlink_list *) list)->head)
        {
                aconf = ptr->data;

                if(aconf->hold <= CurrentTime)
                {
                        /* Alert opers that a TKline expired - Hwy */
                        if(ConfigFileEntry.tkline_expire_notices)
                                sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                                     "Temporary K-line for [%s@%s] expired",
                                                     (aconf->user) ? aconf->
                                                     user : "*", (aconf->host) ? aconf->host : "*");

                        delete_one_address_conf(aconf->host, aconf);
                        dlinkDestroy(ptr, list);
                }
        }
}

static void
reorganise_temp_kd(void *list)
{
        struct ConfItem *aconf;
        dlink_node *ptr, *next_ptr;

        DLINK_FOREACH_SAFE(ptr, next_ptr, ((dlink_list *) list)->head)
        {
                aconf = ptr->data;

                if(aconf->hold < (CurrentTime + (60 * 60)))
                {
                        dlinkMoveNode(ptr, list, (aconf->status == CONF_KILL) ? 
                                        &temp_klines[TEMP_MIN] : &temp_dlines[TEMP_MIN]);
                        aconf->port = TEMP_MIN;
                }
                else if(aconf->port > TEMP_HOUR)
                {
                        if(aconf->hold < (CurrentTime + (1440 * 60)))
                        {
                                dlinkMoveNode(ptr, list, (aconf->status == CONF_KILL) ? 
                                                &temp_klines[TEMP_HOUR] : &temp_dlines[TEMP_HOUR]);
                                aconf->port = TEMP_HOUR;
                        }
                        else if(aconf->port > TEMP_DAY && 
                                (aconf->hold < (CurrentTime + (10080 * 60))))
                        {
                                dlinkMoveNode(ptr, list, (aconf->status == CONF_KILL) ? 
                                                &temp_klines[TEMP_DAY] : &temp_dlines[TEMP_DAY]);
                                aconf->port = TEMP_DAY;
                        }
                }
        }
}


/* const char* get_oper_name(struct Client *client_p)
 * Input: A client to find the active oper{} name for.
 * Output: The nick!user@host{oper} of the oper.
 *         "oper" is server name for remote opers
 * Side effects: None.
 */
char *
get_oper_name(struct Client *client_p)
{
        /* +5 for !,@,{,} and null */
        static char buffer[NICKLEN + USERLEN + HOSTLEN + HOSTLEN + 5];

        if(MyOper(client_p))
        {
                ircsnprintf(buffer, sizeof(buffer), "%s!%s@%s{%s}",
                                client_p->name, client_p->username,
                                client_p->host, client_p->localClient->opername);
                return buffer;
        }

        ircsnprintf(buffer, sizeof(buffer), "%s!%s@%s{%s}",
                   client_p->name, client_p->username, 
                   client_p->host, client_p->servptr->name);
        return buffer;
}

/*
 * get_printable_conf
 *
 * inputs        - struct ConfItem
 *
 * output         - name 
 *                - host
 *                - pass
 *                - user
 *                - port
 *
 * side effects        -
 * Examine the struct struct ConfItem, setting the values
 * of name, host, pass, user to values either
 * in aconf, or "<NULL>" port is set to aconf->port in all cases.
 */
void
get_printable_conf(struct ConfItem *aconf, char **name, char **host,
                   char **pass, char **user, int *port, char **classname)
{
        static char null[] = "<NULL>";
        static char zero[] = "default";

        *name = EmptyString(aconf->name) ? null : aconf->name;
        *host = EmptyString(aconf->host) ? null : aconf->host;
        *pass = EmptyString(aconf->passwd) ? null : aconf->passwd;
        *user = EmptyString(aconf->user) ? null : aconf->user;
        *classname = EmptyString(aconf->className) ? zero : aconf->className;
        *port = (int) aconf->port;
}

void
get_printable_kline(struct Client *source_p, struct ConfItem *aconf, 
                    char **host, char **reason,
                    char **user, char **oper_reason)
{
        static char null[] = "<NULL>";

        *host = EmptyString(aconf->host) ? null : aconf->host;
        *reason = EmptyString(aconf->passwd) ? null : aconf->passwd;
        *user = EmptyString(aconf->user) ? null : aconf->user;

        if(EmptyString(aconf->spasswd) || !IsOper(source_p))
                *oper_reason = NULL;
        else
                *oper_reason = aconf->spasswd;
}

/*
 * read_conf_files
 *
 * inputs       - cold start YES or NO
 * output       - none
 * side effects - read all conf files needed, ircd.conf kline.conf etc.
 */
void
read_conf_files(int cold)
{
        const char *filename;

        conf_fbfile_in = NULL;

        filename = get_conf_name(CONF_TYPE);

        /* We need to know the initial filename for the yyerror() to report
           FIXME: The full path is in conffilenamebuf first time since we
           dont know anything else

           - Gozem 2002-07-21 
         */
        strlcpy(conffilebuf, filename, sizeof(conffilebuf));

        if((conf_fbfile_in = fopen(filename, "r")) == NULL)
        {
                if(cold)
                {
                        ilog(L_MAIN, "Failed in reading configuration file %s", filename);
                        exit(-1);
                }
                else
                {
                        sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                             "Can't open file '%s' - aborting rehash!", filename);
                        return;
                }
        }

        if(!cold)
        {
                clear_out_old_conf();
        }

        read_conf(conf_fbfile_in);
        fclose(conf_fbfile_in);
}

/*
 * clear_out_old_conf
 *
 * inputs       - none
 * output       - none
 * side effects - Clear out the old configuration
 */
static void
clear_out_old_conf(void)
{
        struct Class *cltmp;
        dlink_node *ptr;
        dlink_node *next_ptr;
        int i;

        /*
         * don't delete the class table, rather mark all entries
         * for deletion. The table is cleaned up by check_class. - avalon
         */
        DLINK_FOREACH(ptr, class_list.head)
        {
                cltmp = ptr->data;
                MaxUsers(cltmp) = -1;
        }

        clear_out_address_conf();
        clear_s_newconf();

        /* clean out module paths */
#ifndef STATIC_MODULES
        mod_clear_paths();
        mod_add_path(MODULE_DIR);
        mod_add_path(MODULE_DIR  "/autoload");
#endif

        /* clean out ServerInfo */
        MyFree(ServerInfo.description);
        ServerInfo.description = NULL;
        MyFree(ServerInfo.network_name);
        ServerInfo.network_name = NULL;
        MyFree(ServerInfo.network_desc);
        ServerInfo.network_desc = NULL;

        /* clean out AdminInfo */
        MyFree(AdminInfo.name);
        AdminInfo.name = NULL;
        MyFree(AdminInfo.email);
        AdminInfo.email = NULL;
        MyFree(AdminInfo.description);
        AdminInfo.description = NULL;

        /* operator{} and class{} blocks are freed above */
        /* clean out listeners */
        close_listeners();

        /* auth{}, quarantine{}, shared{}, connect{}, kill{}, deny{}, exempt{}
         * and gecos{} blocks are freed above too
         */

        /* clean out general */
        MyFree(ConfigFileEntry.servlink_path);
        ConfigFileEntry.servlink_path = NULL;

        DLINK_FOREACH_SAFE(ptr, next_ptr, service_list.head)
        {
                MyFree(ptr->data);
                dlinkDestroy(ptr, &service_list);
        }

        /* remove any aliases... -- nenolod */
        for (i = 0; i < MAX_MSG_HASH; i++)
        {
                DLINK_FOREACH_SAFE(ptr, next_ptr, alias_hash_table[i].head)
                {
                        struct alias_entry *aptr = ptr->data;

                        MyFree(aptr->name);
                        MyFree(aptr->target);
                        MyFree(aptr);

                        dlinkDestroy(ptr, &alias_hash_table[i]);
                }
        }

        destroy_blacklists();

        /* OK, that should be everything... */
}


/* write_confitem()
 *
 * inputs       - kline, dline or resv type flag
 *              - client pointer to report to
 *              - user name of target
 *              - host name of target
 *              - reason for target
 *              - time string
 *              - type of xline
 * output       - NONE
 * side effects - This function takes care of finding the right conf
 *                file and adding the line to it, as well as notifying
 *                opers and the user.
 */
void
write_confitem(KlineType type, struct Client *source_p, char *user,
               char *host, const char *reason, const char *oper_reason,
               const char *current_date, int xtype)
{
        char buffer[1024];
        FILE *out;
        const char *filename;   /* filename to use for kline */

        filename = get_conf_name(type);

        if(type == KLINE_TYPE)
        {
                if(EmptyString(oper_reason))
                {
                        sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                        "%s added K-Line for [%s@%s] [%s]",
                                        get_oper_name(source_p), user, 
                                        host, reason);
                        ilog(L_KLINE, "K %s 0 %s %s %s",
                                get_oper_name(source_p), user, host, reason);
                }
                else
                {
                        sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                        "%s added K-Line for [%s@%s] [%s|%s]",
                                        get_oper_name(source_p), user,
                                        host, reason, oper_reason);
                        ilog(L_KLINE, "K %s 0 %s %s %s|%s",
                                get_oper_name(source_p), user, host,
                                reason, oper_reason);
                }

                sendto_one_notice(source_p, ":Added K-Line [%s@%s]",
                                  user, host);
        }
        else if(type == DLINE_TYPE)
        {
                if(EmptyString(oper_reason))
                {
                        sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                        "%s added D-Line for [%s] [%s]",
                                        get_oper_name(source_p), host, reason);
                        ilog(L_KLINE, "D %s 0 %s %s",
                                get_oper_name(source_p), host, reason);
                }
                else
                {
                        sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                        "%s added D-Line for [%s] [%s|%s]",
                                        get_oper_name(source_p), host, 
                                        reason, oper_reason);
                        ilog(L_KLINE, "D %s 0 %s %s|%s",
                                get_oper_name(source_p), host, 
                                reason, oper_reason);
                }

                sendto_one_notice(source_p, ":Added D-Line [%s] to %s", host, filename);

        }
        else if(type == RESV_TYPE)
        {
                sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                "%s added RESV for [%s] [%s]",
                                get_oper_name(source_p), host, reason);
                ilog(L_KLINE, "R %s 0 %s %s",
                        get_oper_name(source_p), host, reason);

                sendto_one_notice(source_p, ":Added RESV for [%s] [%s]",
                                  host, reason);
        }

        if((out = fopen(filename, "a")) == NULL)
        {
                sendto_realops_snomask(SNO_GENERAL, L_ALL, "*** Problem opening %s ", filename);
                sendto_one_notice(source_p, ":*** Problem opening file, added temporarily only");
                return;
        }

        if(oper_reason == NULL)
                oper_reason = "";

        if(type == KLINE_TYPE)
        {
                ircsnprintf(buffer, sizeof(buffer),
                           "\"%s\",\"%s\",\"%s\",\"%s\",\"%s\",\"%s\",%ld\n",
                           user, host, reason, oper_reason, current_date,
                           get_oper_name(source_p), CurrentTime);
        }
        else if(type == DLINE_TYPE)
        {
                ircsnprintf(buffer, sizeof(buffer),
                           "\"%s\",\"%s\",\"%s\",\"%s\",\"%s\",%ld\n", host,
                           reason, oper_reason, current_date, get_oper_name(source_p), CurrentTime);
        }
        else if(type == RESV_TYPE)
        {
                ircsnprintf(buffer, sizeof(buffer), "\"%s\",\"%s\",\"%s\",%ld\n",
                           host, reason, get_oper_name(source_p), CurrentTime);
        }

        if(fputs(buffer, out) == -1)
        {
                sendto_realops_snomask(SNO_GENERAL, L_ALL, "*** Problem writing to %s", filename);
                sendto_one_notice(source_p, ":*** Problem writing to file, added temporarily only");
                fclose(out);
                return;
        }

        if (fclose(out))
        {
                sendto_realops_snomask(SNO_GENERAL, L_ALL, "*** Problem writing to %s", filename);
                sendto_one_notice(source_p, ":*** Problem writing to file, added temporarily only");
                return;
        }
}

/* get_conf_name
 *
 * inputs       - type of conf file to return name of file for
 * output       - pointer to filename for type of conf
 * side effects - none
 */
const char *
get_conf_name(KlineType type)
{
        if(type == CONF_TYPE)
        {
                return (ConfigFileEntry.configfile);
        }
        else if(type == DLINE_TYPE)
        {
                return (ConfigFileEntry.dlinefile);
        }
        else if(type == RESV_TYPE)
        {
                return (ConfigFileEntry.resvfile);
        }

        return ConfigFileEntry.klinefile;
}

/*
 * conf_add_class_to_conf
 * inputs       - pointer to config item
 * output       - NONE
 * side effects - Add a class pointer to a conf 
 */

void
conf_add_class_to_conf(struct ConfItem *aconf)
{
        if(aconf->className == NULL)
        {
                DupString(aconf->className, "default");
                ClassPtr(aconf) = default_class;
                return;
        }

        ClassPtr(aconf) = find_class(aconf->className);

        if(ClassPtr(aconf) == default_class)
        {
                if(aconf->status == CONF_CLIENT)
                {
                        sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                             "Warning -- Using default class for missing class \"%s\" in auth{} for %s@%s",
                                             aconf->className, aconf->user, aconf->host);
                }

                MyFree(aconf->className);
                DupString(aconf->className, "default");
                return;
        }

        if(ConfMaxUsers(aconf) < 0)
        {
                ClassPtr(aconf) = default_class;
                MyFree(aconf->className);
                DupString(aconf->className, "default");
                return;
        }
}

/*
 * conf_add_d_conf
 * inputs       - pointer to config item
 * output       - NONE
 * side effects - Add a d/D line
 */
void
conf_add_d_conf(struct ConfItem *aconf)
{
        if(aconf->host == NULL)
                return;

        aconf->user = NULL;

        /* XXX - Should 'd' ever be in the old conf? For new conf we don't
         *       need this anyway, so I will disable it for now... -A1kmm
         */

        if(parse_netmask(aconf->host, NULL, NULL) == HM_HOST)
        {
                ilog(L_MAIN, "Invalid Dline %s ignored", aconf->host);
                free_conf(aconf);
        }
        else
        {
                add_conf_by_address(aconf->host, CONF_DLINE, NULL, aconf);
        }
}


/*
 * yyerror
 *
 * inputs       - message from parser
 * output       - none
 * side effects - message to opers and log file entry is made
 */
void
yyerror(const char *msg)
{
        char newlinebuf[BUFSIZE];

        strip_tabs(newlinebuf, (const unsigned char *) linebuf, strlen(linebuf));

        sendto_realops_snomask(SNO_GENERAL, L_ALL, "\"%s\", line %d: %s at '%s'",
                             conffilebuf, lineno + 1, msg, newlinebuf);

        ilog(L_MAIN, "\"%s\", line %d: %s at '%s'", conffilebuf, lineno + 1, msg, newlinebuf);
}

int
conf_fgets(char *lbuf, int max_size, FILE * fb)
{
        char *buff;

        if((buff = fgets(lbuf, max_size, fb)) == NULL)
                return (0);

        return (strlen(lbuf));
}

int
conf_yy_fatal_error(const char *msg)
{
        return (0);
}