trunk/src/conf.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  conf.c: Configuration file functions.
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 *
 *  $Id$
 */

#include "stdinc.h"
#include "list.h"
#include "ircd_defs.h"
#include "balloc.h"
#include "conf.h"
#include "s_serv.h"
#include "resv.h"
#include "channel.h"
#include "client.h"
#include "event.h"
#include "hash.h"
#include "hook.h"
#include "irc_string.h"
#include "sprintf_irc.h"
#include "s_bsd.h"
#include "ircd.h"
#include "listener.h"
#include "hostmask.h"
#include "modules.h"
#include "numeric.h"
#include "fdlist.h"
#include "log.h"
#include "send.h"
#include "s_gline.h"
#include "fileio.h"
#include "memory.h"
#include "irc_res.h"
#include "userhost.h"
#include "s_user.h"
#include "channel_mode.h"
#include "parse.h"
#include "s_misc.h"

struct Callback *client_check_cb = NULL;
struct config_server_hide ConfigServerHide;

/* general conf items link list root, other than k lines etc. */
dlink_list service_items = { NULL, NULL, 0 };
dlink_list server_items  = { NULL, NULL, 0 };
dlink_list cluster_items = { NULL, NULL, 0 };
dlink_list hub_items     = { NULL, NULL, 0 };
dlink_list leaf_items    = { NULL, NULL, 0 };
dlink_list oconf_items   = { NULL, NULL, 0 };
dlink_list uconf_items   = { NULL, NULL, 0 };
dlink_list xconf_items   = { NULL, NULL, 0 };
dlink_list rxconf_items  = { NULL, NULL, 0 };
dlink_list rkconf_items  = { NULL, NULL, 0 };
dlink_list nresv_items   = { NULL, NULL, 0 };
dlink_list class_items   = { NULL, NULL, 0 };
dlink_list gdeny_items   = { NULL, NULL, 0 };

dlink_list temporary_klines  = { NULL, NULL, 0 };
dlink_list temporary_dlines  = { NULL, NULL, 0 };
dlink_list temporary_xlines  = { NULL, NULL, 0 };
dlink_list temporary_rklines = { NULL, NULL, 0 };
dlink_list temporary_glines  = { NULL, NULL, 0 };
dlink_list temporary_rxlines = { NULL, NULL, 0 };
dlink_list temporary_resv = { NULL, NULL, 0 };

extern unsigned int lineno;
extern char linebuf[];
extern char conffilebuf[IRCD_BUFSIZE];
extern char yytext[];
extern int yyparse(); /* defined in y.tab.c */

struct conf_parser_context conf_parser_ctx = { 0, 0, NULL };

/* internally defined functions */
static void lookup_confhost(struct ConfItem *);
static void set_default_conf(void);
static void validate_conf(void);
static void read_conf(FBFILE *);
static void clear_out_old_conf(void);
static void flush_deleted_I_P(void);
static void expire_tklines(dlink_list *);
static void garbage_collect_ip_entries(void);
static int hash_ip(struct irc_ssaddr *);
static int verify_access(struct Client *, const char *);
static int attach_iline(struct Client *, struct ConfItem *);
static struct ip_entry *find_or_add_ip(struct irc_ssaddr *);
static void parse_conf_file(int, int);
static dlink_list *map_to_list(ConfType);
static struct AccessItem *find_regexp_kline(const char *[]);
static int find_user_host(struct Client *, char *, char *, char *, unsigned int);

/*
 * bit_len
 */
static int cidr_limit_reached(int, struct irc_ssaddr *, struct ClassItem *);
static void remove_from_cidr_check(struct irc_ssaddr *, struct ClassItem *);
static void destroy_cidr_class(struct ClassItem *);

static void flags_to_ascii(unsigned int, const unsigned int[], char *, int);

/* address of default class conf */
static struct ConfItem *class_default;

/* usually, with hash tables, you use a prime number...
 * but in this case I am dealing with ip addresses,
 * not ascii strings.
 */
#define IP_HASH_SIZE 0x1000

struct ip_entry
{
  struct irc_ssaddr ip;
  int count;
  time_t last_attempt;
  struct ip_entry *next;
};

static struct ip_entry *ip_hash_table[IP_HASH_SIZE];
static BlockHeap *ip_entry_heap = NULL;
static int ip_entries_count = 0;


void *
map_to_conf(struct ConfItem *aconf)
{
  void *conf;
  conf = (void *)((uintptr_t)aconf +
                  (uintptr_t)sizeof(struct ConfItem));
  return(conf);
}

struct ConfItem *
unmap_conf_item(void *aconf)
{
  struct ConfItem *conf;

  conf = (struct ConfItem *)((uintptr_t)aconf -
                             (uintptr_t)sizeof(struct ConfItem));
  return(conf);
}

/* conf_dns_callback()
 *
 * inputs       - pointer to struct AccessItem
 *              - pointer to DNSReply reply
 * output       - none
 * side effects - called when resolver query finishes
 * if the query resulted in a successful search, hp will contain
 * a non-null pointer, otherwise hp will be null.
 * if successful save hp in the conf item it was called with
 */
static void
conf_dns_callback(void *vptr, const struct irc_ssaddr *addr, const char *name)
{
  struct AccessItem *aconf = vptr;

  aconf->dns_pending = 0;

  if (addr != NULL)
    memcpy(&aconf->ipnum, addr, sizeof(aconf->ipnum));
  else
    aconf->dns_failed = 1;
}

/* conf_dns_lookup()
 *
 * do a nameserver lookup of the conf host
 * if the conf entry is currently doing a ns lookup do nothing, otherwise
 * allocate a dns_query and start ns lookup.
 */
static void
conf_dns_lookup(struct AccessItem *aconf)
{
  if (!aconf->dns_pending)
  {
    aconf->dns_pending = 1;
    gethost_byname(conf_dns_callback, aconf, aconf->host);
  }
}

/* make_conf_item()
 *
 * inputs       - type of item
 * output       - pointer to new conf entry
 * side effects - none
 */
struct ConfItem *
make_conf_item(ConfType type)
{
  struct ConfItem *conf = NULL;
  struct AccessItem *aconf = NULL;
  struct ClassItem *aclass = NULL;
  int status = 0;

  switch (type)
  {
  case DLINE_TYPE:
  case EXEMPTDLINE_TYPE:
  case GLINE_TYPE:
  case KLINE_TYPE:
  case CLIENT_TYPE:
  case OPER_TYPE:
  case SERVER_TYPE:
    conf = MyMalloc(sizeof(struct ConfItem) +
                    sizeof(struct AccessItem));
    aconf = map_to_conf(conf);
    aconf->aftype = AF_INET;

    /* Yes, sigh. switch on type again */
    switch (type)
    {
    case EXEMPTDLINE_TYPE:
      status = CONF_EXEMPTDLINE;
      break;

    case DLINE_TYPE:
      status = CONF_DLINE;
      break;

    case KLINE_TYPE:
      status = CONF_KLINE;
      break;

    case GLINE_TYPE:
      status = CONF_GLINE;
      break;

    case CLIENT_TYPE:
      status = CONF_CLIENT;
      break;

    case OPER_TYPE:
      status = CONF_OPERATOR;
      dlinkAdd(conf, &conf->node, &oconf_items);
      break;

    case SERVER_TYPE:
      status = CONF_SERVER;
      dlinkAdd(conf, &conf->node, &server_items);
      break;

    default:
      break;
    }
    aconf->status = status;
    break;

  case LEAF_TYPE:
    conf = (struct ConfItem *)MyMalloc(sizeof(struct ConfItem) +
                                       sizeof(struct MatchItem));
    dlinkAdd(conf, &conf->node, &leaf_items);
    break;

  case HUB_TYPE:
    conf = (struct ConfItem *)MyMalloc(sizeof(struct ConfItem) +
                                       sizeof(struct MatchItem));
    dlinkAdd(conf, &conf->node, &hub_items);
    break;

  case ULINE_TYPE:
    conf = (struct ConfItem *)MyMalloc(sizeof(struct ConfItem) +
                                       sizeof(struct MatchItem));
    dlinkAdd(conf, &conf->node, &uconf_items);
    break;

  case GDENY_TYPE:
    conf = (struct ConfItem *)MyMalloc(sizeof(struct ConfItem) +
                                       sizeof(struct AccessItem));
    dlinkAdd(conf, &conf->node, &gdeny_items);
    break;

  case XLINE_TYPE:
    conf = (struct ConfItem *)MyMalloc(sizeof(struct ConfItem) +
                                       sizeof(struct MatchItem));
    dlinkAdd(conf, &conf->node, &xconf_items);
    break;
#ifdef HAVE_LIBPCRE
  case RXLINE_TYPE:
    conf = (struct ConfItem *)MyMalloc(sizeof(struct ConfItem) +
                                       sizeof(struct MatchItem));
    dlinkAdd(conf, &conf->node, &rxconf_items);
    break;

  case RKLINE_TYPE:
    conf = (struct ConfItem *)MyMalloc(sizeof(struct ConfItem) +
                                       sizeof(struct AccessItem));
    aconf = map_to_conf(conf);
    aconf->status = CONF_KLINE;
    dlinkAdd(conf, &conf->node, &rkconf_items);
    break;
#endif
  case CLUSTER_TYPE:
    conf = (struct ConfItem *)MyMalloc(sizeof(struct ConfItem));
    dlinkAdd(conf, &conf->node, &cluster_items);
    break;

  case CRESV_TYPE:
    conf = (struct ConfItem *)MyMalloc(sizeof(struct ConfItem) +
                                       sizeof(struct ResvChannel));
    break;

  case NRESV_TYPE:
    conf = (struct ConfItem *)MyMalloc(sizeof(struct ConfItem) +
                                       sizeof(struct MatchItem));
    dlinkAdd(conf, &conf->node, &nresv_items);
    break;

  case SERVICE_TYPE:
    status = CONF_SERVICE;
    conf = MyMalloc(sizeof(struct ConfItem));
    dlinkAdd(conf, &conf->node, &service_items);
    break;

  case CLASS_TYPE:
    conf = MyMalloc(sizeof(struct ConfItem) +
                           sizeof(struct ClassItem));
    dlinkAdd(conf, &conf->node, &class_items);

    aclass = map_to_conf(conf);
    aclass->active = 1;
    ConFreq(aclass) = DEFAULT_CONNECTFREQUENCY;
    PingFreq(aclass) = DEFAULT_PINGFREQUENCY;
    MaxTotal(aclass) = MAXIMUM_LINKS_DEFAULT;
    MaxSendq(aclass) = DEFAULT_SENDQ;

    break;

  default:
    conf = NULL;
    break;
  }

  /* XXX Yes, this will core if default is hit. I want it to for now - db */
  conf->type = type;

  return conf;
}

void
delete_conf_item(struct ConfItem *conf)
{
  dlink_node *m = NULL;
  struct MatchItem *match_item;
  struct AccessItem *aconf;
  ConfType type = conf->type;

  MyFree(conf->name);
  conf->name = NULL;

  switch(type)
  {
  case DLINE_TYPE:
  case EXEMPTDLINE_TYPE:
  case GLINE_TYPE:
  case KLINE_TYPE:
  case CLIENT_TYPE:
  case OPER_TYPE:
  case SERVER_TYPE:
    aconf = map_to_conf(conf);

    if (aconf->dns_pending)
      delete_resolver_queries(aconf);
    if (aconf->passwd != NULL)
      memset(aconf->passwd, 0, strlen(aconf->passwd));
    if (aconf->spasswd != NULL)
      memset(aconf->spasswd, 0, strlen(aconf->spasswd));
    aconf->class_ptr = NULL;

    MyFree(aconf->passwd);
    MyFree(aconf->spasswd);
    MyFree(aconf->reason);
    MyFree(aconf->oper_reason);
    MyFree(aconf->user);
    MyFree(aconf->host);
    MyFree(aconf->cipher_list);
#ifdef HAVE_LIBCRYPTO
    if (aconf->rsa_public_key)
      RSA_free(aconf->rsa_public_key);
    MyFree(aconf->rsa_public_key_file);
#endif

    /* Yes, sigh. switch on type again */
    switch(type)
    {
    case EXEMPTDLINE_TYPE:
    case DLINE_TYPE:
    case GLINE_TYPE:
    case KLINE_TYPE:
    case CLIENT_TYPE:
      MyFree(conf);
      break;

    case OPER_TYPE:
      aconf = map_to_conf(conf);
      if (!IsConfIllegal(aconf))
        dlinkDelete(&conf->node, &oconf_items);
      MyFree(conf);
      break;

    case SERVER_TYPE:
      aconf = map_to_conf(conf);
      if (!IsConfIllegal(aconf))
        dlinkDelete(&conf->node, &server_items);
      MyFree(conf);
      break;

    default:
      break;
    }
    break;

  case HUB_TYPE:
    match_item = map_to_conf(conf);
    MyFree(match_item->user);
    MyFree(match_item->host);
    MyFree(match_item->reason);
    MyFree(match_item->oper_reason);
    /* If marked illegal, its already been pulled off of the hub_items list */
    if (!match_item->illegal)
      dlinkDelete(&conf->node, &hub_items);
    MyFree(conf);
    break;

  case LEAF_TYPE:
    match_item = map_to_conf(conf);
    MyFree(match_item->user);
    MyFree(match_item->host);
    MyFree(match_item->reason);
    MyFree(match_item->oper_reason);
    /* If marked illegal, its already been pulled off of the leaf_items list */
    if (!match_item->illegal)
      dlinkDelete(&conf->node, &leaf_items);
    MyFree(conf);
    break;

  case ULINE_TYPE:
    match_item = map_to_conf(conf);
    MyFree(match_item->user);
    MyFree(match_item->host);
    MyFree(match_item->reason);
    MyFree(match_item->oper_reason);
    dlinkDelete(&conf->node, &uconf_items);
    MyFree(conf);
    break;

  case XLINE_TYPE:
    match_item = map_to_conf(conf);
    MyFree(match_item->user);
    MyFree(match_item->host);
    MyFree(match_item->reason);
    MyFree(match_item->oper_reason);
    dlinkDelete(&conf->node, &xconf_items);
    MyFree(conf);
    break;
#ifdef HAVE_LIBPCRE
  case RKLINE_TYPE:
    aconf = map_to_conf(conf);
    MyFree(aconf->regexuser);
    MyFree(aconf->regexhost);
    MyFree(aconf->user);
    MyFree(aconf->host);
    MyFree(aconf->reason);
    MyFree(aconf->oper_reason);
    dlinkDelete(&conf->node, &rkconf_items);
    MyFree(conf);
    break;

  case RXLINE_TYPE:
    MyFree(conf->regexpname);
    match_item = map_to_conf(conf);
    MyFree(match_item->user);
    MyFree(match_item->host);
    MyFree(match_item->reason);
    MyFree(match_item->oper_reason);
    dlinkDelete(&conf->node, &rxconf_items);
    MyFree(conf);
    break;
#endif
  case NRESV_TYPE:
    match_item = map_to_conf(conf);
    MyFree(match_item->user);
    MyFree(match_item->host);
    MyFree(match_item->reason);
    MyFree(match_item->oper_reason);
    dlinkDelete(&conf->node, &nresv_items);

    if (conf->flags & CONF_FLAGS_TEMPORARY)
      if ((m = dlinkFindDelete(&temporary_resv, conf)) != NULL)
        free_dlink_node(m);

    MyFree(conf);
    break;

  case GDENY_TYPE:
    aconf = map_to_conf(conf);
    MyFree(aconf->user);
    MyFree(aconf->host);
    dlinkDelete(&conf->node, &gdeny_items);
    MyFree(conf);
    break;

  case CLUSTER_TYPE:
    dlinkDelete(&conf->node, &cluster_items);
    MyFree(conf);
    break;

  case CRESV_TYPE:
    if (conf->flags & CONF_FLAGS_TEMPORARY)
      if ((m = dlinkFindDelete(&temporary_resv, conf)) != NULL)
        free_dlink_node(m);

    MyFree(conf);
    break;

  case CLASS_TYPE:
    dlinkDelete(&conf->node, &class_items);
    MyFree(conf);
    break;

  case SERVICE_TYPE:
    dlinkDelete(&conf->node, &service_items);
    MyFree(conf);
    break;

  default:
    break;
  }
}

/* free_access_item()
 *
 * inputs       - pointer to conf to free
 * output       - none
 * side effects - crucial password fields are zeroed, conf is freed
 */
void
free_access_item(struct AccessItem *aconf)
{
  struct ConfItem *conf;

  if (aconf == NULL)
    return;
  conf = unmap_conf_item(aconf);
  delete_conf_item(conf);
}

static const unsigned int shared_bit_table[] =
  { 'K', 'k', 'U', 'X', 'x', 'Y', 'Q', 'q', 'R', 'L', 0};

/* report_confitem_types()
 *
 * inputs       - pointer to client requesting confitem report
 *              - ConfType to report
 * output       - none
 * side effects -
 */
void
report_confitem_types(struct Client *source_p, ConfType type, int temp)
{
  dlink_node *ptr = NULL;
  struct ConfItem *conf = NULL;
  struct AccessItem *aconf = NULL;
  struct MatchItem *matchitem = NULL;
  struct ClassItem *classitem = NULL;
  char buf[12];
  char *p = NULL;
  const char *pfx = NULL;

  switch (type)
  {
  case GDENY_TYPE:
    DLINK_FOREACH(ptr, gdeny_items.head)
    {
      conf = ptr->data;
      aconf = map_to_conf(conf);

      p = buf;

      if (aconf->flags & GDENY_BLOCK)
        *p++ = 'B';
      else
        *p++ = 'b';

      if (aconf->flags & GDENY_REJECT)
        *p++ = 'R';
      else
        *p++ = 'r';

      *p = '\0';

      sendto_one(source_p, ":%s %d %s V %s@%s %s %s",
                 me.name, RPL_STATSDEBUG, source_p->name, 
                 aconf->user, aconf->host, conf->name, buf);
    }
    break;

  case XLINE_TYPE:
    DLINK_FOREACH(ptr, xconf_items.head)
    {
      conf = ptr->data;
      matchitem = map_to_conf(conf);

      sendto_one(source_p, form_str(RPL_STATSXLINE),
                 me.name, source_p->name, 
                 matchitem->hold ? "x": "X", matchitem->count,
                 conf->name, matchitem->reason);
    }
    break;

#ifdef HAVE_LIBPCRE
  case RXLINE_TYPE:
    DLINK_FOREACH(ptr, rxconf_items.head)
    {
      conf = ptr->data;
      matchitem = map_to_conf(conf);

      sendto_one(source_p, form_str(RPL_STATSXLINE),
                 me.name, source_p->name,
                 matchitem->hold ? "xR": "XR", matchitem->count,
                 conf->name, matchitem->reason);
    }
    break;

  case RKLINE_TYPE:
    pfx = temp ? "kR" : "KR";

    DLINK_FOREACH(ptr, rkconf_items.head)
    {
      aconf = map_to_conf((conf = ptr->data));

      if (temp && !(conf->flags & CONF_FLAGS_TEMPORARY))
        continue;

      sendto_one(source_p, form_str(RPL_STATSKLINE), me.name,
                 source_p->name, pfx, aconf->host, aconf->user,
                 aconf->reason, aconf->oper_reason ? aconf->oper_reason : "");
    }
    break;
#endif

  case ULINE_TYPE:
    DLINK_FOREACH(ptr, uconf_items.head)
    {
      conf = ptr->data;
      matchitem = map_to_conf(conf);

      p = buf;

      /* some of these are redundant for the sake of 
       * consistency with cluster{} flags
       */
      *p++ = 'c';
      flags_to_ascii(matchitem->action, shared_bit_table, p, 0);

      sendto_one(source_p, form_str(RPL_STATSULINE),
                 me.name, source_p->name, conf->name,
                 matchitem->user?matchitem->user: "*",
                 matchitem->host?matchitem->host: "*", buf);
    }

    DLINK_FOREACH(ptr, cluster_items.head)
    {
      conf = ptr->data;

      p = buf;

      *p++ = 'C';
      flags_to_ascii(conf->flags, shared_bit_table, p, 0);

      sendto_one(source_p, form_str(RPL_STATSULINE),
                 me.name, source_p->name, conf->name,
                 "*", "*", buf);
    }

    break;

  case OPER_TYPE:
    DLINK_FOREACH(ptr, oconf_items.head)
    {
      conf = ptr->data;
      aconf = map_to_conf(conf);

      /* Don't allow non opers to see oper privs */
      if (HasUMode(source_p, UMODE_OPER))
        sendto_one(source_p, form_str(RPL_STATSOLINE),
                   me.name, source_p->name, 'O', aconf->user, aconf->host,
                   conf->name, oper_privs_as_string(aconf->port),
                   aconf->class_ptr ? aconf->class_ptr->name : "<default>");
      else
        sendto_one(source_p, form_str(RPL_STATSOLINE),
                   me.name, source_p->name, 'O', aconf->user, aconf->host,
                   conf->name, "0",
                   aconf->class_ptr ? aconf->class_ptr->name : "<default>");
    }
    break;

  case CLASS_TYPE:
    DLINK_FOREACH(ptr, class_items.head)
    {
      conf = ptr->data;
      classitem = map_to_conf(conf);
      sendto_one(source_p, form_str(RPL_STATSYLINE),
                 me.name, source_p->name, 'Y',
                 conf->name, PingFreq(classitem),
                 ConFreq(classitem),
                 MaxTotal(classitem), MaxSendq(classitem),
                 CurrUserCount(classitem),
                 classitem->active ? "active" : "disabled");
    }
    break;

  case CONF_TYPE:
  case CLIENT_TYPE:
    break;

  case SERVICE_TYPE:
    DLINK_FOREACH(ptr, service_items.head)
    {
      conf = ptr->data;
      sendto_one(source_p, form_str(RPL_STATSSERVICE),
                 me.name, source_p->name, 'S', "*", conf->name, 0, 0);
    }
    break;

  case SERVER_TYPE:
    DLINK_FOREACH(ptr, server_items.head)
    {
      p = buf;

      conf = ptr->data;
      aconf = map_to_conf(conf);

      buf[0] = '\0';

      if (IsConfAllowAutoConn(aconf))
        *p++ = 'A';
      if (IsConfSSL(aconf))
        *p++ = 'S';
      if (IsConfTopicBurst(aconf))
        *p++ = 'T';
      if (buf[0] == '\0')
        *p++ = '*';

      *p = '\0';

      /*
       * Allow admins to see actual ips unless hide_server_ips is enabled
       */
      if (!ConfigServerHide.hide_server_ips && HasUMode(source_p, UMODE_ADMIN))
        sendto_one(source_p, form_str(RPL_STATSCLINE),
                   me.name, source_p->name, 'C', aconf->host,
                   buf, conf->name, aconf->port,
                   aconf->class_ptr ? aconf->class_ptr->name : "<default>");
        else
          sendto_one(source_p, form_str(RPL_STATSCLINE),
                     me.name, source_p->name, 'C',
                     "*@127.0.0.1", buf, conf->name, aconf->port,
                     aconf->class_ptr ? aconf->class_ptr->name : "<default>");
    }
    break;

  case HUB_TYPE:
    DLINK_FOREACH(ptr, hub_items.head)
    {
      conf = ptr->data;
      matchitem = map_to_conf(conf);
      sendto_one(source_p, form_str(RPL_STATSHLINE), me.name,
                 source_p->name, 'H', matchitem->host, conf->name, 0, "*");
    }
    break;

  case LEAF_TYPE:
    DLINK_FOREACH(ptr, leaf_items.head)
    {
      conf = ptr->data;
      matchitem = map_to_conf(conf);
      sendto_one(source_p, form_str(RPL_STATSLLINE), me.name,
                 source_p->name, 'L', matchitem->host, conf->name, 0, "*");
    }
    break;

  case GLINE_TYPE:
  case KLINE_TYPE:
  case DLINE_TYPE:
  case EXEMPTDLINE_TYPE:
  case CRESV_TYPE:
  case NRESV_TYPE:
  case CLUSTER_TYPE:
  default:
    break;
  }
}

/* check_client()
 *
 * inputs       - pointer to client
 * output       - 0 = Success
 *                NOT_AUTHORIZED    (-1) = Access denied (no I line match)
 *                IRCD_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.
 */
static void *
check_client(va_list args)
{
  struct Client *source_p = va_arg(args, struct Client *);
  const char *username = va_arg(args, const char *);
  int i;
 
  /* I'm already in big trouble if source_p->localClient is NULL -db */
  if ((i = verify_access(source_p, username)))
    ilog(LOG_TYPE_IRCD, "Access denied: %s[%s]", 
         source_p->name, source_p->sockhost);

  switch (i)
  {
    case TOO_MANY:
      sendto_realops_flags(UMODE_FULL, L_ALL,
                           "Too many on IP for %s (%s).",
                           get_client_name(source_p, SHOW_IP),
                           source_p->sockhost);
      ilog(LOG_TYPE_IRCD, "Too many connections on IP from %s.",
           get_client_name(source_p, SHOW_IP));
      ++ServerStats.is_ref;
      exit_client(source_p, &me, "No more connections allowed on that IP");
      break;

    case I_LINE_FULL:
      sendto_realops_flags(UMODE_FULL, L_ALL,
                           "I-line is full for %s (%s).",
                           get_client_name(source_p, SHOW_IP),
                           source_p->sockhost);
      ilog(LOG_TYPE_IRCD, "Too many connections from %s.",
           get_client_name(source_p, SHOW_IP));
      ++ServerStats.is_ref;
      exit_client(source_p, &me, 
                "No more connections allowed in your connection class");
      break;

    case NOT_AUTHORIZED:
      ++ServerStats.is_ref;
      /* jdc - lists server name & port connections are on */
      /*       a purely cosmetical change */
      sendto_realops_flags(UMODE_UNAUTH, L_ALL,
                           "Unauthorized client connection from %s [%s] on [%s/%u].",
                           get_client_name(source_p, SHOW_IP),
                           source_p->sockhost,
                           source_p->localClient->listener->name,
                           source_p->localClient->listener->port);
      ilog(LOG_TYPE_IRCD,
          "Unauthorized client connection from %s on [%s/%u].",
          get_client_name(source_p, SHOW_IP),
          source_p->localClient->listener->name,
          source_p->localClient->listener->port);

      /* XXX It is prolematical whether it is better to use the
       * capture reject code here or rely on the connecting too fast code.
       * - Dianora
       */
      if (REJECT_HOLD_TIME > 0)
      {
        sendto_one(source_p, ":%s NOTICE %s :You are not authorized to use this server",
                   me.name, source_p->name);
        source_p->localClient->reject_delay = CurrentTime + REJECT_HOLD_TIME;
        SetCaptured(source_p);
      }
      else
        exit_client(source_p, &me, "You are not authorized to use this server");
      break;

   case BANNED_CLIENT:
     /*
      * Don't exit them immediately, play with them a bit.
      * - Dianora
      */
     if (REJECT_HOLD_TIME > 0)
     {
       source_p->localClient->reject_delay = CurrentTime + REJECT_HOLD_TIME;
       SetCaptured(source_p);
     }
     else
       exit_client(source_p, &me, "Banned");
     ++ServerStats.is_ref;
     break;

   case 0:
   default:
     break;
  }

  return (i < 0 ? NULL : source_p);
}

/* 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 AccessItem *aconf = NULL, *rkconf = NULL;
  struct ConfItem *conf = NULL;
  char non_ident[USERLEN + 1] = { '~', '\0' };
  const char *uhi[3];

  if (IsGotId(client_p))
  {
    aconf = find_address_conf(client_p->host, client_p->username,
                             &client_p->localClient->ip,
                             client_p->localClient->aftype,
                             client_p->localClient->passwd);
  }
  else
  {
    strlcpy(non_ident+1, username, sizeof(non_ident)-1);
    aconf = find_address_conf(client_p->host,non_ident,
                             &client_p->localClient->ip,
                             client_p->localClient->aftype,
                             client_p->localClient->passwd);
  }

  uhi[0] = IsGotId(client_p) ? client_p->username : non_ident;
  uhi[1] = client_p->host;
  uhi[2] = client_p->sockhost;

  rkconf = find_regexp_kline(uhi);

  if (aconf != NULL)
  {
    if (IsConfClient(aconf) && !rkconf)
    {
      conf = unmap_conf_item(aconf);

      if (IsConfRedir(aconf))
      {
        sendto_one(client_p, form_str(RPL_REDIR),
                   me.name, client_p->name,
                   conf->name ? conf->name : "",
                   aconf->port);
        return(NOT_AUTHORIZED);
      }

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

      /* Thanks for spoof idea amm */
      if (IsConfDoSpoofIp(aconf))
      {
        conf = unmap_conf_item(aconf);

        if (!ConfigFileEntry.hide_spoof_ips && IsConfSpoofNotice(aconf))
          sendto_realops_flags(UMODE_ALL, L_ADMIN, "%s spoofing: %s as %s",
                               client_p->name, client_p->host, conf->name);
        strlcpy(client_p->host, conf->name, sizeof(client_p->host));
        SetIPSpoof(client_p);
      }

      return(attach_iline(client_p, conf));
    }
    else if (rkconf || IsConfKill(aconf) || (ConfigFileEntry.glines && IsConfGline(aconf)))
    {
      /* XXX */
      aconf = rkconf ? rkconf : aconf;
      if (IsConfGline(aconf))
        sendto_one(client_p, ":%s NOTICE %s :*** G-lined", me.name,
                   client_p->name);
      if (ConfigFileEntry.kline_with_reason)
        sendto_one(client_p, ":%s NOTICE %s :*** Banned %s", 
                  me.name, client_p->name, aconf->reason);
      return(BANNED_CLIENT);
    }
  }

  return(NOT_AUTHORIZED);
}

/* attach_iline()
 *
 * inputs       - client pointer
 *              - conf pointer
 * output       -
 * side effects - do actual attach
 */
static int
attach_iline(struct Client *client_p, struct ConfItem *conf)
{
  struct AccessItem *aconf;
  struct ClassItem *aclass;
  struct ip_entry *ip_found;
  int a_limit_reached = 0;
  int local = 0, global = 0, ident = 0;

  ip_found = find_or_add_ip(&client_p->localClient->ip);
  ip_found->count++;
  SetIpHash(client_p);

  aconf = map_to_conf(conf);
  if (aconf->class_ptr == NULL)
    return NOT_AUTHORIZED;  /* If class is missing, this is best */

  aclass = map_to_conf(aconf->class_ptr);

  count_user_host(client_p->username, client_p->host,
                  &global, &local, &ident);

  /* XXX blah. go down checking the various silly limits
   * setting a_limit_reached if any limit is reached.
   * - Dianora
   */
  if (MaxTotal(aclass) != 0 && CurrUserCount(aclass) >= MaxTotal(aclass))
    a_limit_reached = 1;
  else if (MaxPerIp(aclass) != 0 && ip_found->count > MaxPerIp(aclass))
    a_limit_reached = 1;
  else if (MaxLocal(aclass) != 0 && local >= MaxLocal(aclass))
    a_limit_reached = 1;
  else if (MaxGlobal(aclass) != 0 && global >= MaxGlobal(aclass))
    a_limit_reached = 1;
  else if (MaxIdent(aclass) != 0 && ident >= MaxIdent(aclass) &&
           client_p->username[0] != '~')
    a_limit_reached = 1;

  if (a_limit_reached)
  {
    if (!IsConfExemptLimits(aconf))
      return TOO_MANY;   /* Already at maximum allowed */

    sendto_one(client_p,
               ":%s NOTICE %s :*** Your connection class is full, "
               "but you have exceed_limit = yes;", me.name, client_p->name);
  }

  return attach_conf(client_p, conf);
}

/* init_ip_hash_table()
 *
 * inputs               - NONE
 * output               - NONE
 * side effects         - allocate memory for ip_entry(s)
 *                      - clear the ip hash table
 */
void
init_ip_hash_table(void)
{
  ip_entry_heap = BlockHeapCreate("ip", sizeof(struct ip_entry),
    2 * hard_fdlimit);
  memset(ip_hash_table, 0, sizeof(ip_hash_table));
}

/* find_or_add_ip()
 *
 * inputs       - pointer to struct irc_ssaddr
 * output       - pointer to a struct ip_entry
 * side effects -
 *
 * If the ip # was not found, a new struct ip_entry is created, and the ip
 * count set to 0.
 */
static struct ip_entry *
find_or_add_ip(struct irc_ssaddr *ip_in)
{
  struct ip_entry *ptr, *newptr;
  int hash_index = hash_ip(ip_in), res;
  struct sockaddr_in *v4 = (struct sockaddr_in *)ip_in, *ptr_v4;
#ifdef IPV6
  struct sockaddr_in6 *v6 = (struct sockaddr_in6 *)ip_in, *ptr_v6;
#endif

  for (ptr = ip_hash_table[hash_index]; ptr; ptr = ptr->next)
  {
#ifdef IPV6
    if (ptr->ip.ss.ss_family != ip_in->ss.ss_family)
      continue;
    if (ip_in->ss.ss_family == AF_INET6)
    {
      ptr_v6 = (struct sockaddr_in6 *)&ptr->ip;
      res = memcmp(&v6->sin6_addr, &ptr_v6->sin6_addr, sizeof(struct in6_addr));
    }
    else
#endif
    {
      ptr_v4 = (struct sockaddr_in *)&ptr->ip;
      res = memcmp(&v4->sin_addr, &ptr_v4->sin_addr, sizeof(struct in_addr));
    }
    if (res == 0)
    {
      /* Found entry already in hash, return it. */
      return ptr;
    }
  }

  if (ip_entries_count >= 2 * hard_fdlimit)
    garbage_collect_ip_entries();

  newptr = BlockHeapAlloc(ip_entry_heap);
  ip_entries_count++;
  memcpy(&newptr->ip, ip_in, sizeof(struct irc_ssaddr));

  newptr->next = ip_hash_table[hash_index];
  ip_hash_table[hash_index] = newptr;

  return newptr;
}

/* remove_one_ip()
 *
 * inputs        - unsigned long IP address value
 * output        - NONE
 * side effects  - The ip address given, is looked up in ip hash table
 *                 and number of ip#'s for that ip decremented.
 *                 If ip # count reaches 0 and has expired,
 *                 the struct ip_entry is returned to the ip_entry_heap
 */
void
remove_one_ip(struct irc_ssaddr *ip_in)
{
  struct ip_entry *ptr;
  struct ip_entry *last_ptr = NULL;
  int hash_index = hash_ip(ip_in), res;
  struct sockaddr_in *v4 = (struct sockaddr_in *)ip_in, *ptr_v4;
#ifdef IPV6
  struct sockaddr_in6 *v6 = (struct sockaddr_in6 *)ip_in, *ptr_v6;
#endif

  for (ptr = ip_hash_table[hash_index]; ptr; ptr = ptr->next)
  {
#ifdef IPV6
    if (ptr->ip.ss.ss_family != ip_in->ss.ss_family)
      continue;
    if (ip_in->ss.ss_family == AF_INET6)
    {
      ptr_v6 = (struct sockaddr_in6 *)&ptr->ip;
      res = memcmp(&v6->sin6_addr, &ptr_v6->sin6_addr, sizeof(struct in6_addr));
    }
    else
#endif
    {
      ptr_v4 = (struct sockaddr_in *)&ptr->ip;
      res = memcmp(&v4->sin_addr, &ptr_v4->sin_addr, sizeof(struct in_addr));
    }
    if (res)
      continue;
    if (ptr->count > 0)
      ptr->count--;
    if (ptr->count == 0 &&
        (CurrentTime-ptr->last_attempt) >= ConfigFileEntry.throttle_time)
    {
      if (last_ptr != NULL)
        last_ptr->next = ptr->next;
      else
        ip_hash_table[hash_index] = ptr->next;

      BlockHeapFree(ip_entry_heap, ptr);
      ip_entries_count--;
      return;
    }
    last_ptr = ptr;
  }
}

/* hash_ip()
 *
 * input        - pointer to an irc_inaddr
 * output       - integer value used as index into hash table
 * side effects - hopefully, none
 */
static int
hash_ip(struct irc_ssaddr *addr)
{
  if (addr->ss.ss_family == AF_INET)
  {
    struct sockaddr_in *v4 = (struct sockaddr_in *)addr;
    int hash;
    uint32_t ip;

    ip   = ntohl(v4->sin_addr.s_addr);
    hash = ((ip >> 12) + ip) & (IP_HASH_SIZE-1);
    return hash;
  }
#ifdef IPV6
  else
  {
    int hash;
    struct sockaddr_in6 *v6 = (struct sockaddr_in6 *)addr;
    uint32_t *ip = (uint32_t *)&v6->sin6_addr.s6_addr;

    hash  = ip[0] ^ ip[3];
    hash ^= hash >> 16;  
    hash ^= hash >> 8;   
    hash  = hash & (IP_HASH_SIZE - 1);
    return hash;
  }
#else
  return 0;
#endif
}

/* count_ip_hash()
 *
 * inputs        - pointer to counter of number of ips hashed 
 *               - pointer to memory used for ip hash
 * output        - returned via pointers input
 * side effects  - NONE
 *
 * number of hashed ip #'s is counted up, plus the amount of memory
 * used in the hash.
 */
void
count_ip_hash(unsigned int *number_ips_stored, uint64_t *mem_ips_stored)
{
  struct ip_entry *ptr;
  int i;

  *number_ips_stored = 0;
  *mem_ips_stored    = 0;

  for (i = 0; i < IP_HASH_SIZE; i++)
  {
    for (ptr = ip_hash_table[i]; ptr; ptr = ptr->next)
    {
      *number_ips_stored += 1;
      *mem_ips_stored += sizeof(struct ip_entry);
    }
  }
}

/* garbage_collect_ip_entries()
 *
 * input        - NONE
 * output       - NONE
 * side effects - free up all ip entries with no connections
 */
static void
garbage_collect_ip_entries(void)
{
  struct ip_entry *ptr;
  struct ip_entry *last_ptr;
  struct ip_entry *next_ptr;
  int i;

  for (i = 0; i < IP_HASH_SIZE; i++)
  {
    last_ptr = NULL;

    for (ptr = ip_hash_table[i]; ptr; ptr = next_ptr)
    {
      next_ptr = ptr->next;

      if (ptr->count == 0 &&
          (CurrentTime - ptr->last_attempt) >= ConfigFileEntry.throttle_time)
      {
        if (last_ptr != NULL)
          last_ptr->next = ptr->next;
        else
          ip_hash_table[i] = ptr->next;
        BlockHeapFree(ip_entry_heap, ptr);
        ip_entries_count--;
      }
      else
        last_ptr = ptr;
    }
  }
}

/* detach_conf()
 *
 * inputs       - pointer to client to detach
 *              - type of conf 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, ConfType type)
{
  dlink_node *ptr, *next_ptr;
  struct ConfItem *conf;
  struct ClassItem *aclass;
  struct AccessItem *aconf;
  struct ConfItem *aclass_conf;
  struct MatchItem *match_item;

  DLINK_FOREACH_SAFE(ptr, next_ptr, client_p->localClient->confs.head)
  {
    conf = ptr->data;

    if (type == CONF_TYPE || conf->type == type)
    {
      dlinkDelete(ptr, &client_p->localClient->confs);
      free_dlink_node(ptr);

      switch (conf->type)
      {
      case CLIENT_TYPE:
      case OPER_TYPE:
      case SERVER_TYPE:
        aconf = map_to_conf(conf);

        assert(aconf->clients > 0);

        if ((aclass_conf = ClassPtr(aconf)) != NULL)
        {
          aclass = map_to_conf(aclass_conf);

          assert(aclass->curr_user_count > 0);

          if (conf->type == CLIENT_TYPE)
            remove_from_cidr_check(&client_p->localClient->ip, aclass);
          if (--aclass->curr_user_count == 0 && aclass->active == 0)
            delete_conf_item(aclass_conf);
        }

        if (--aconf->clients == 0 && IsConfIllegal(aconf))
          delete_conf_item(conf);

        break;

      case LEAF_TYPE:
      case HUB_TYPE:
        match_item = map_to_conf(conf);
        if (match_item->ref_count == 0 && match_item->illegal)
          delete_conf_item(conf);
        break;
      default:
        break;
      }

      if (type != CONF_TYPE)
        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 *conf)
{
  if (dlinkFind(&client_p->localClient->confs, conf) != NULL)
    return 1;

  if (conf->type == CLIENT_TYPE ||
      conf->type == SERVER_TYPE ||
      conf->type == OPER_TYPE)
  {
    struct AccessItem *aconf = map_to_conf(conf);
    struct ClassItem *aclass = map_to_conf(aconf->class_ptr);

    if (IsConfIllegal(aconf))
      return NOT_AUTHORIZED;

    if (conf->type == CLIENT_TYPE)
      if (cidr_limit_reached(IsConfExemptLimits(aconf),
                             &client_p->localClient->ip, aclass))
        return TOO_MANY;    /* Already at maximum allowed */

    CurrUserCount(aclass)++;
    aconf->clients++;
  }
  else if (conf->type == HUB_TYPE || conf->type == LEAF_TYPE)
  {
    struct MatchItem *match_item = map_to_conf(conf);
    match_item->ref_count++;
  }

  dlinkAdd(conf, make_dlink_node(), &client_p->localClient->confs);

  return 0;
}

/* attach_connect_block()
 *
 * inputs       - pointer to server to attach
 *              - name of server
 *              - hostname of server
 * output       - true (1) if both are found, otherwise return false (0)
 * side effects - find connect block and attach them to connecting client
 */
int
attach_connect_block(struct Client *client_p, const char *name,
                     const char *host)
{
  dlink_node *ptr;
  struct ConfItem *conf;
  struct AccessItem *aconf;

  assert(client_p != NULL);
  assert(host != NULL);

  if (client_p == NULL || host == NULL)
    return 0;

  DLINK_FOREACH(ptr, server_items.head)
  {
    conf = ptr->data;
    aconf = map_to_conf(conf);

    if (match(conf->name, name) == 0 || match(aconf->host, host) == 0)
      continue;

    attach_conf(client_p, conf);
    return -1;
  }

  return 0;
}

/* find_conf_exact()
 *
 * inputs       - type of ConfItem
 *              - pointer to name to find
 *              - pointer to username to find
 *              - pointer to host to find
 * output       - NULL or pointer to conf found
 * side effects - find a conf entry which matches the hostname
 *                and has the same name.
 */
struct ConfItem *
find_conf_exact(ConfType type, const char *name, const char *user, 
                const char *host)
{
  dlink_node *ptr;
  dlink_list *list_p;
  struct ConfItem *conf = NULL;
  struct AccessItem *aconf;

  /* Only valid for OPER_TYPE and ...? */
  list_p = map_to_list(type);

  DLINK_FOREACH(ptr, (*list_p).head)
  {
    conf = ptr->data;

    if (conf->name == NULL)
      continue;
    aconf = map_to_conf(conf);
    if (aconf->host == NULL)
      continue;
    if (irccmp(conf->name, name) != 0)
      continue;

    /*
    ** Accept if the *real* hostname (usually sockethost)
    ** socket host) matches *either* host or name field
    ** of the configuration.
    */
    if (!match(aconf->host, host) || !match(aconf->user, user))
      continue;
    if (type == OPER_TYPE)
    {
      struct ClassItem *aclass = map_to_conf(aconf->class_ptr);

      if (aconf->clients >= MaxTotal(aclass))
        continue;
    }

    return conf;
  }

  return NULL;
}

/* find_conf_name()
 *
 * inputs       - pointer to conf link list to search
 *              - pointer to name to find
 *              - int mask of type of conf to find
 * output       - NULL or pointer to conf found
 * side effects - find a conf entry which matches the name
 *                and has the given mask.
 */
struct ConfItem *
find_conf_name(dlink_list *list, const char *name, ConfType type)
{
  dlink_node *ptr;
  struct ConfItem* conf;

  DLINK_FOREACH(ptr, list->head)
  {
    conf = ptr->data;
    
    if (conf->type == type)
    {
      if (conf->name && (irccmp(conf->name, name) == 0 ||
                         match(conf->name, name)))
      return conf;
    }
  }

  return NULL;
}

/* map_to_list()
 *
 * inputs       - ConfType conf
 * output       - pointer to dlink_list to use
 * side effects - none
 */
static dlink_list *
map_to_list(ConfType type)
{
  switch(type)
  {
  case RXLINE_TYPE:
    return(&rxconf_items);
    break;
  case XLINE_TYPE:
    return(&xconf_items);
    break;
  case ULINE_TYPE:
    return(&uconf_items);
    break;
  case NRESV_TYPE:
    return(&nresv_items);
    break;
  case OPER_TYPE:
    return(&oconf_items);
    break;
  case CLASS_TYPE:
    return(&class_items);
    break;
  case SERVER_TYPE:
    return(&server_items);
    break;
  case SERVICE_TYPE:
    return(&service_items);
    break;
  case CLUSTER_TYPE:
    return(&cluster_items);
    break;
  case CONF_TYPE:
  case GLINE_TYPE:
  case KLINE_TYPE:
  case DLINE_TYPE:
  case CRESV_TYPE:
  default:
    return NULL;
  }
}

/* find_matching_name_conf()
 *
 * inputs       - type of link list to look in
 *              - pointer to name string to find
 *              - pointer to user
 *              - pointer to host
 *              - optional action to match on as well
 * output       - NULL or pointer to found struct MatchItem
 * side effects - looks for a match on name field
 */
struct ConfItem *
find_matching_name_conf(ConfType type, const char *name, const char *user,
                        const char *host, int action)
{
  dlink_node *ptr=NULL;
  struct ConfItem *conf=NULL;
  struct AccessItem *aconf=NULL;
  struct MatchItem *match_item=NULL;
  dlink_list *list_p = map_to_list(type);

  switch (type)
  {
#ifdef HAVE_LIBPCRE
  case RXLINE_TYPE:
      DLINK_FOREACH(ptr, list_p->head)
      {
        conf = ptr->data;
        assert(conf->regexpname);

        if (!ircd_pcre_exec(conf->regexpname, name))
          return conf;
      }
      break;
#endif
  case SERVICE_TYPE:
    DLINK_FOREACH(ptr, list_p->head)
    {
      conf = ptr->data;

      if (EmptyString(conf->name))
        continue;
      if ((name != NULL) && !irccmp(name, conf->name))
        return conf;
    }
    break;

  case XLINE_TYPE:
  case ULINE_TYPE:
  case NRESV_TYPE:
    DLINK_FOREACH(ptr, list_p->head)
    {
      conf = ptr->data;

      match_item = map_to_conf(conf);
      if (EmptyString(conf->name))
        continue;
      if ((name != NULL) && match_esc(conf->name, name))
      {
        if ((user == NULL && (host == NULL)))
          return conf;
        if ((match_item->action & action) != action)
          continue;
        if (EmptyString(match_item->user) || EmptyString(match_item->host))
          return conf;
        if (match(match_item->user, user) && match(match_item->host, host))
          return conf;
      }
    }
      break;

  case SERVER_TYPE:
    DLINK_FOREACH(ptr, list_p->head)
    {
      conf = ptr->data;
      aconf = map_to_conf(conf);

      if ((name != NULL) && match_esc(name, conf->name))
        return conf;
      else if ((host != NULL) && match_esc(host, aconf->host))
        return conf;
    }
    break;
  
  default:
    break;
  }
  return NULL;
}

/* find_exact_name_conf()
 *
 * inputs       - type of link list to look in
 *              - pointer to name string to find
 *              - pointer to user
 *              - pointer to host
 * output       - NULL or pointer to found struct MatchItem
 * side effects - looks for an exact match on name field
 */
struct ConfItem *
find_exact_name_conf(ConfType type, const struct Client *who, const char *name,
                     const char *user, const char *host)
{
  dlink_node *ptr = NULL;
  struct AccessItem *aconf;
  struct ConfItem *conf;
  struct MatchItem *match_item;
  dlink_list *list_p;

  list_p = map_to_list(type);

  switch(type)
  {
  case RXLINE_TYPE:
  case XLINE_TYPE:
  case ULINE_TYPE:
  case NRESV_TYPE:

    DLINK_FOREACH(ptr, list_p->head)
    {
      conf = ptr->data;
      match_item = (struct MatchItem *)map_to_conf(conf);
      if (EmptyString(conf->name))
        continue;
    
      if (irccmp(conf->name, name) == 0)
      {
        if ((user == NULL && (host == NULL)))
          return (conf);
        if (EmptyString(match_item->user) || EmptyString(match_item->host))
          return (conf);
        if (match(match_item->user, user) && match(match_item->host, host))
          return (conf);
      }
    }
    break;

  case OPER_TYPE:
    DLINK_FOREACH(ptr, list_p->head)
    {
      conf = ptr->data;
      aconf = map_to_conf(conf);

      if (EmptyString(conf->name))
        continue;

      if (!irccmp(conf->name, name))
      {
        if (!who)
          return conf;
        if (EmptyString(aconf->user) || EmptyString(aconf->host))
          return conf;
        if (match(aconf->user, who->username))
        {
          switch (aconf->type)
          {
            case HM_HOST:
              if (match(aconf->host, who->host) || match(aconf->host, who->sockhost))
                return conf;
              break;
            case HM_IPV4:
              if (who->localClient->aftype == AF_INET)
                if (match_ipv4(&who->localClient->ip, &aconf->ipnum, aconf->bits))
                  return conf;
              break;
#ifdef IPV6
            case HM_IPV6:
              if (who->localClient->aftype == AF_INET6)
                if (match_ipv6(&who->localClient->ip, &aconf->ipnum, aconf->bits))
                  return conf;
              break;
#endif
            default:
              assert(0);
          }
        }
      }
    }

    break;

  case SERVER_TYPE:
    DLINK_FOREACH(ptr, list_p->head)
    {
      conf = ptr->data;
      aconf = (struct AccessItem *)map_to_conf(conf);
      if (EmptyString(conf->name))
        continue;
    
      if (name == NULL)
      {
        if (EmptyString(aconf->host))
          continue;
        if (irccmp(aconf->host, host) == 0)
          return(conf);
      }
      else if (irccmp(conf->name, name) == 0)
      {
          return (conf);
      }
    }
    break;

  case CLASS_TYPE:
    DLINK_FOREACH(ptr, list_p->head)
    {
      conf = ptr->data;
      if (EmptyString(conf->name))
        continue;
    
      if (irccmp(conf->name, name) == 0)
        return (conf);
    }
    break;

  default:
    break;
  }
  return(NULL);
}

/* 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_flags(UMODE_ALL, 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 */

  /* Check to see if we magically got(or lost) IPv6 support */
  check_can_use_v6();

  read_conf_files(0);

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

  load_conf_modules();

  flush_deleted_I_P();

  rehashed_klines = 1;
/* XXX */
  if (ConfigLoggingEntry.use_logging)
    log_close_all();

  return(0);
}

/* 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().
 */
static void
set_default_conf(void)
{
  /* verify init_class() ran, this should be an unnecessary check
   * but its not much work.
   */
  assert(class_default == (struct ConfItem *) class_items.tail->data);

#ifdef HAVE_LIBCRYPTO
  ServerInfo.rsa_private_key = NULL;
  ServerInfo.rsa_private_key_file = NULL;
#endif

  /* 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;
  memset(&ServerInfo.ip6, 0, sizeof(ServerInfo.ip6));
  ServerInfo.specific_ipv6_vhost = 0;

  ServerInfo.max_clients = MAXCLIENTS_MAX;

  ServerInfo.hub = 0;
  ServerInfo.dns_host.sin_addr.s_addr = 0;
  ServerInfo.dns_host.sin_port = 0;
  AdminInfo.name = NULL;
  AdminInfo.email = NULL;
  AdminInfo.description = NULL;

  log_close_all();

  ConfigLoggingEntry.use_logging = 1;
  ConfigLoggingEntry.timestamp = 1;

  ConfigChannel.disable_fake_channels = 0;
  ConfigChannel.restrict_channels = 0;
  ConfigChannel.disable_local_channels = 0;
  ConfigChannel.use_invex = 1;
  ConfigChannel.use_except = 1;
  ConfigChannel.use_knock = 1;
  ConfigChannel.knock_delay = 300;
  ConfigChannel.knock_delay_channel = 60;
  ConfigChannel.max_chans_per_user = 15;
  ConfigChannel.quiet_on_ban = 1;
  ConfigChannel.max_bans = 25;
  ConfigChannel.default_split_user_count = 0;
  ConfigChannel.default_split_server_count = 0;
  ConfigChannel.no_join_on_split = 0;
  ConfigChannel.no_create_on_split = 0;
  ConfigChannel.burst_topicwho = 1;

  ConfigServerHide.flatten_links = 0;
  ConfigServerHide.links_delay = 300;
  ConfigServerHide.hidden = 0;
  ConfigServerHide.disable_hidden = 0;
  ConfigServerHide.hide_servers = 0;
  DupString(ConfigServerHide.hidden_name, NETWORK_NAME_DEFAULT);
  ConfigServerHide.hide_server_ips = 0;

  
  DupString(ConfigFileEntry.service_name, SERVICE_NAME_DEFAULT);
  ConfigFileEntry.max_watch = WATCHSIZE_DEFAULT;
  ConfigFileEntry.gline_min_cidr = 16;
  ConfigFileEntry.gline_min_cidr6 = 48;
  ConfigFileEntry.invisible_on_connect = 1;
  ConfigFileEntry.burst_away = 0;
  ConfigFileEntry.use_whois_actually = 1;
  ConfigFileEntry.tkline_expire_notices = 1;
  ConfigFileEntry.hide_spoof_ips = 1;
  ConfigFileEntry.ignore_bogus_ts = 0;
  ConfigFileEntry.disable_auth = 0;
  ConfigFileEntry.disable_remote = 0;
  ConfigFileEntry.kill_chase_time_limit = 90;
  ConfigFileEntry.default_floodcount = 8;
  ConfigFileEntry.failed_oper_notice = 1;
  ConfigFileEntry.dots_in_ident = 0;
  ConfigFileEntry.min_nonwildcard = 4;
  ConfigFileEntry.min_nonwildcard_simple = 3;
  ConfigFileEntry.max_accept = 20;
  ConfigFileEntry.anti_nick_flood = 0;
  ConfigFileEntry.max_nick_time = 20;
  ConfigFileEntry.max_nick_changes = 5;
  ConfigFileEntry.anti_spam_exit_message_time = 0;
  ConfigFileEntry.ts_warn_delta = TS_WARN_DELTA_DEFAULT;
  ConfigFileEntry.ts_max_delta = TS_MAX_DELTA_DEFAULT;
  ConfigFileEntry.kline_with_reason = 1;
  ConfigFileEntry.kline_reason = NULL;
  ConfigFileEntry.warn_no_nline = 1;
  ConfigFileEntry.stats_o_oper_only = 0;
  ConfigFileEntry.stats_k_oper_only = 1;  /* masked */
  ConfigFileEntry.stats_i_oper_only = 1;  /* masked */
  ConfigFileEntry.stats_P_oper_only = 0;
  ConfigFileEntry.caller_id_wait = 60;
  ConfigFileEntry.opers_bypass_callerid = 0;
  ConfigFileEntry.pace_wait = 10;
  ConfigFileEntry.pace_wait_simple = 1;
  ConfigFileEntry.short_motd = 0;
  ConfigFileEntry.ping_cookie = 0;
  ConfigFileEntry.no_oper_flood = 0;
  ConfigFileEntry.true_no_oper_flood = 0;
  ConfigFileEntry.oper_pass_resv = 1;
  ConfigFileEntry.glines = 0;
  ConfigFileEntry.gline_time = 12 * 3600;
  ConfigFileEntry.max_targets = MAX_TARGETS_DEFAULT;
  ConfigFileEntry.client_flood = CLIENT_FLOOD_DEFAULT;
  ConfigFileEntry.oper_only_umodes = UMODE_DEBUG;
  ConfigFileEntry.oper_umodes = UMODE_BOTS | UMODE_LOCOPS | UMODE_SERVNOTICE |
    UMODE_OPERWALL | UMODE_WALLOP;
  ConfigFileEntry.use_egd = 0;
  ConfigFileEntry.egdpool_path = NULL;
  ConfigFileEntry.throttle_time = 10;
}

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

  set_default_conf(); /* Set default values prior to conf parsing */
  conf_parser_ctx.pass = 1;
  yyparse();          /* pick up the classes first */

  fbrewind(file);

  conf_parser_ctx.pass = 2;
  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 (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.service_name == NULL)
    DupString(ConfigFileEntry.service_name, SERVICE_NAME_DEFAULT);

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

  ConfigFileEntry.max_watch = IRCD_MAX(ConfigFileEntry.max_watch, WATCHSIZE_MIN);
}

/* 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.
 */
static void
lookup_confhost(struct ConfItem *conf)
{
  struct AccessItem *aconf;
  struct addrinfo hints, *res;

  aconf = map_to_conf(conf);

  if (EmptyString(aconf->host) ||
      EmptyString(aconf->user))
  {
    ilog(LOG_TYPE_IRCD, "Host/server name error: (%s) (%s)",
         aconf->host, conf->name);
    return;
  }

  if (strchr(aconf->host, '*') ||
      strchr(aconf->host, '?'))
    return;

  /* Do name lookup now on hostnames given and store the
   * ip numbers in conf structure.
   */
  memset(&hints, 0, sizeof(hints));

  hints.ai_family   = AF_UNSPEC;
  hints.ai_socktype = SOCK_STREAM;

  /* Get us ready for a bind() and don't bother doing dns lookup */
  hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;

  if (getaddrinfo(aconf->host, NULL, &hints, &res))
  {
    conf_dns_lookup(aconf);
    return;
  }

  assert(res != NULL);

  memcpy(&aconf->ipnum, res->ai_addr, res->ai_addrlen);
  aconf->ipnum.ss_len = res->ai_addrlen;
  aconf->ipnum.ss.ss_family = res->ai_family;
  freeaddrinfo(res);
}

/* conf_connect_allowed()
 *
 * inputs       - pointer to inaddr
 *              - int type ipv4 or ipv6
 * output       - BANNED or accepted
 * side effects - none
 */
int
conf_connect_allowed(struct irc_ssaddr *addr, int aftype)
{
  struct ip_entry *ip_found;
  struct AccessItem *aconf = find_dline_conf(addr, aftype);

  /* DLINE exempt also gets you out of static limits/pacing... */
  if (aconf && (aconf->status & CONF_EXEMPTDLINE))
    return 0;

  if (aconf != NULL)
    return BANNED_CLIENT;

  ip_found = find_or_add_ip(addr);

  if ((CurrentTime - ip_found->last_attempt) <
      ConfigFileEntry.throttle_time)
  {
    ip_found->last_attempt = CurrentTime;
    return TOO_FAST;
  }

  ip_found->last_attempt = CurrentTime;
  return 0;
}

static struct AccessItem *
find_regexp_kline(const char *uhi[])
{
#ifdef HAVE_LIBPCRE
  const dlink_node *ptr = NULL;

  DLINK_FOREACH(ptr, rkconf_items.head)
  {
    struct AccessItem *aptr = map_to_conf(ptr->data);

    assert(aptr->regexuser);
    assert(aptr->regexhost);

    if (!ircd_pcre_exec(aptr->regexuser, uhi[0]) &&
        (!ircd_pcre_exec(aptr->regexhost, uhi[1]) ||
         !ircd_pcre_exec(aptr->regexhost, uhi[2])))
      return aptr;
  }
#endif
  return NULL;
}

/* find_kill()
 *
 * inputs       - pointer to client structure
 * output       - pointer to struct AccessItem if found
 * side effects - See if this user is klined already,
 *                and if so, return struct AccessItem pointer
 */
struct AccessItem *
find_kill(struct Client *client_p)
{
  struct AccessItem *aconf = NULL;
  const char *uhi[3];

  uhi[0] = client_p->username;
  uhi[1] = client_p->host;
  uhi[2] = client_p->sockhost;

  assert(client_p != NULL);

  aconf = find_kline_conf(client_p->host, client_p->username,
                          &client_p->localClient->ip,
                          client_p->localClient->aftype);
  if (aconf == NULL)
    aconf = find_regexp_kline(uhi);

  if (aconf && (aconf->status & CONF_KLINE))
    return aconf;

  return NULL;
}

struct AccessItem *
find_gline(struct Client *client_p)
{
  struct AccessItem *aconf;

  assert(client_p != NULL);

  aconf = find_gline_conf(client_p->host, client_p->username,
                          &client_p->localClient->ip,
                          client_p->localClient->aftype);

  if (aconf && (aconf->status & CONF_GLINE))
    return aconf;

  return NULL;
}

/* add_temp_line()
 *
 * inputs        - pointer to struct ConfItem
 * output        - none
 * Side effects  - links in given struct ConfItem into 
 *                 temporary *line link list
 */
void
add_temp_line(struct ConfItem *conf)
{
  struct AccessItem *aconf;

  if (conf->type == DLINE_TYPE)
  {
    aconf = map_to_conf(conf);
    SetConfTemporary(aconf);
    dlinkAdd(conf, &conf->node, &temporary_dlines);
    MyFree(aconf->user);
    aconf->user = NULL;
    add_conf_by_address(CONF_DLINE, aconf);
  }
  else if (conf->type == KLINE_TYPE)
  {
    aconf = map_to_conf(conf);
    SetConfTemporary(aconf);
    dlinkAdd(conf, &conf->node, &temporary_klines);
    add_conf_by_address(CONF_KILL, aconf);
  }
  else if (conf->type == GLINE_TYPE)
  {
    aconf = map_to_conf(conf);
    SetConfTemporary(aconf);
    dlinkAdd(conf, &conf->node, &temporary_glines);
    add_conf_by_address(CONF_GLINE, aconf);
  }
  else if (conf->type == XLINE_TYPE)
  {
    conf->flags |= CONF_FLAGS_TEMPORARY;
    dlinkAdd(conf, make_dlink_node(), &temporary_xlines);
  }
  else if (conf->type == RXLINE_TYPE)
  {
    conf->flags |= CONF_FLAGS_TEMPORARY;
    dlinkAdd(conf, make_dlink_node(), &temporary_rxlines);
  }
  else if (conf->type == RKLINE_TYPE)
  {
    conf->flags |= CONF_FLAGS_TEMPORARY;
    dlinkAdd(conf, make_dlink_node(), &temporary_rklines);
  }
  else if ((conf->type == NRESV_TYPE) || (conf->type == CRESV_TYPE))
  {
    conf->flags |= CONF_FLAGS_TEMPORARY;
    dlinkAdd(conf, make_dlink_node(), &temporary_resv);
  }
}

/* cleanup_tklines()
 *
 * inputs       - NONE
 * output       - NONE
 * side effects - call function to expire temporary k/d lines
 *                This is an event started off in ircd.c
 */
void
cleanup_tklines(void *notused)
{
  expire_tklines(&temporary_glines);
  expire_tklines(&temporary_klines);
  expire_tklines(&temporary_dlines);
  expire_tklines(&temporary_xlines);
  expire_tklines(&temporary_rxlines);
  expire_tklines(&temporary_rklines);
  expire_tklines(&temporary_resv);
}

/* expire_tklines()
 *
 * inputs       - tkline list pointer
 * output       - NONE
 * side effects - expire tklines
 */
static void
expire_tklines(dlink_list *tklist)
{
  dlink_node *ptr;
  dlink_node *next_ptr;
  struct ConfItem *conf;
  struct MatchItem *xconf;
  struct MatchItem *nconf;
  struct AccessItem *aconf;
  struct ResvChannel *cconf;

  DLINK_FOREACH_SAFE(ptr, next_ptr, tklist->head)
  {
    conf = ptr->data;
    if (conf->type == GLINE_TYPE ||
        conf->type == KLINE_TYPE ||
        conf->type == DLINE_TYPE)
    {
      aconf = (struct AccessItem *)map_to_conf(conf);
      if (aconf->hold <= CurrentTime)
      {
        /* XXX - Do we want GLINE expiry notices?? */
        /* Alert opers that a TKline expired - Hwy */
        if (ConfigFileEntry.tkline_expire_notices)
        {
          if (aconf->status & CONF_KILL)
          {
            sendto_realops_flags(UMODE_ALL, L_ALL,
                                 "Temporary K-line for [%s@%s] expired",
                                 (aconf->user) ? aconf->user : "*",
                                 (aconf->host) ? aconf->host : "*");
          }
          else if (conf->type == DLINE_TYPE)
          {
            sendto_realops_flags(UMODE_ALL, L_ALL,
                                 "Temporary D-line for [%s] expired",
                                 (aconf->host) ? aconf->host : "*");
          }
        }

        dlinkDelete(ptr, tklist);
        delete_one_address_conf(aconf->host, aconf);
      }
    }
    else if (conf->type == XLINE_TYPE ||
             conf->type == RXLINE_TYPE)
    {
      xconf = (struct MatchItem *)map_to_conf(conf);
      if (xconf->hold <= CurrentTime)
      {
        if (ConfigFileEntry.tkline_expire_notices)
          sendto_realops_flags(UMODE_ALL, L_ALL,
                               "Temporary X-line for [%s] %sexpired", conf->name,
                               conf->type == RXLINE_TYPE ? "(REGEX) " : "");
        dlinkDelete(ptr, tklist);
        free_dlink_node(ptr);
        delete_conf_item(conf);
      }
    }
    else if (conf->type == RKLINE_TYPE)
    {
      aconf = map_to_conf(conf);
      if (aconf->hold <= CurrentTime)
      {
        if (ConfigFileEntry.tkline_expire_notices)
           sendto_realops_flags(UMODE_ALL, L_ALL,
                                "Temporary K-line for [%s@%s] (REGEX) expired",
                                (aconf->user) ? aconf->user : "*",
                                (aconf->host) ? aconf->host : "*");
        dlinkDelete(ptr, tklist);
        free_dlink_node(ptr);
        delete_conf_item(conf);
      }
    }
    else if (conf->type == NRESV_TYPE)
    {
      nconf = (struct MatchItem *)map_to_conf(conf);
      if (nconf->hold <= CurrentTime)
      {
        if (ConfigFileEntry.tkline_expire_notices)
          sendto_realops_flags(UMODE_ALL, L_ALL,
                               "Temporary RESV for [%s] expired", conf->name);
        dlinkDelete(ptr, tklist);
        free_dlink_node(ptr);
        delete_conf_item(conf);
      }
    }
    else if (conf->type == CRESV_TYPE)
    {
      cconf = (struct ResvChannel *)map_to_conf(conf);
      if (cconf->hold <= CurrentTime)
      {
        if (ConfigFileEntry.tkline_expire_notices)
          sendto_realops_flags(UMODE_ALL, L_ALL,
                               "Temporary RESV for [%s] expired", cconf->name);
        delete_channel_resv(cconf);
      }
    }
  }
}

/* oper_privs_as_string()
 *
 * inputs        - pointer to client_p
 * output        - pointer to static string showing oper privs
 * side effects  - return as string, the oper privs as derived from port
 */
static const struct oper_privs
{
  const unsigned int oprivs;
  const unsigned char c;
} flag_list[] = {
  { OPER_FLAG_ADMIN,       'A' },
  { OPER_FLAG_REMOTEBAN,   'B' },
  { OPER_FLAG_DIE,         'D' },
  { OPER_FLAG_GLINE,       'G' },
  { OPER_FLAG_REHASH,      'H' },
  { OPER_FLAG_K,           'K' },
  { OPER_FLAG_OPERWALL,    'L' },
  { OPER_FLAG_N,           'N' },
  { OPER_FLAG_GLOBAL_KILL, 'O' },
  { OPER_FLAG_REMOTE,      'R' },
  { OPER_FLAG_OPER_SPY,    'S' },
  { OPER_FLAG_UNKLINE,     'U' },
  { OPER_FLAG_X,           'X' },
  { 0, '\0' }
};

char *
oper_privs_as_string(const unsigned int port)
{
  static char privs_out[16];
  char *privs_ptr = privs_out;
  unsigned int i = 0;

  for (; flag_list[i].oprivs; ++i)
  {
    if (port & flag_list[i].oprivs)
      *privs_ptr++ = flag_list[i].c;
    else
      *privs_ptr++ = ToLowerTab[flag_list[i].c];
  }

  *privs_ptr = '\0';

  return privs_out;
}

/*
 * 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(const struct Client *client_p)
{
  dlink_node *cnode;
  struct ConfItem *conf;
  struct AccessItem *aconf;

  /* +5 for !,@,{,} and null */
  static char buffer[NICKLEN + USERLEN + HOSTLEN + HOSTLEN + 5];

  if (MyConnect(client_p))
  {
    DLINK_FOREACH(cnode, client_p->localClient->confs.head)
    {
      conf = cnode->data;
      aconf = map_to_conf(conf);

      if (IsConfOperator(aconf))
      {
        snprintf(buffer, sizeof(buffer), "%s!%s@%s{%s}", client_p->name,
                 client_p->username, client_p->host, conf->name);
        return buffer;
      }
    }

    /* Probably should assert here for now. If there is an oper out there 
     * with no oper{} conf attached, it would be good for us to know...
     */
    assert(0); /* Oper without oper conf! */
  }

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

/* 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;
  char chanmodes[32];
  char chanlimit[32];

  conf_parser_ctx.boot = cold;
  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_parser_ctx.conf_file = fbopen(filename, "r")) == NULL)
  {
    if (cold)
    {
      ilog(LOG_TYPE_IRCD, "Unable to read configuration file '%s': %s",
           filename, strerror(errno));
      exit(-1);
    }
    else
    {
      sendto_realops_flags(UMODE_ALL, L_ALL,
                           "Unable to read configuration file '%s': %s",
                           filename, strerror(errno));
      return;
    }
  }

  if (!cold)
    clear_out_old_conf();

  read_conf(conf_parser_ctx.conf_file);
  fbclose(conf_parser_ctx.conf_file);

  add_isupport("NETWORK", ServerInfo.network_name, -1);
  snprintf(chanmodes, sizeof(chanmodes), "b%s%s:%d",
           ConfigChannel.use_except ? "e" : "",
           ConfigChannel.use_invex ? "I" : "", ConfigChannel.max_bans);
  add_isupport("MAXLIST", chanmodes, -1);
  add_isupport("MAXTARGETS", NULL, ConfigFileEntry.max_targets);

  if (ConfigChannel.disable_local_channels)
    add_isupport("CHANTYPES", "#", -1);
  else
    add_isupport("CHANTYPES", "#&", -1);

  snprintf(chanlimit, sizeof(chanlimit), "%s:%d",
           ConfigChannel.disable_local_channels ? "#" : "#&",
           ConfigChannel.max_chans_per_user);
  add_isupport("CHANLIMIT", chanlimit, -1);
  snprintf(chanmodes, sizeof(chanmodes), "%s%s%s",
           ConfigChannel.use_except ? "e" : "",
           ConfigChannel.use_invex ? "I" : "", "b,k,l,imnprstORS");
  add_isupport("CHANNELLEN", NULL, LOCAL_CHANNELLEN);

  if (ConfigChannel.use_except)
    add_isupport("EXCEPTS", "e", -1);
  if (ConfigChannel.use_invex)
    add_isupport("INVEX", "I", -1);
  add_isupport("CHANMODES", chanmodes, -1);

  /*
   * message_locale may have changed.  rebuild isupport since it relies
   * on strlen(form_str(RPL_ISUPPORT))
   */
  rebuild_isupport_message_line();

#ifdef HAVE_LIBPCRE
  parse_conf_file(RKLINE_TYPE, cold);
  parse_conf_file(RXLINE_TYPE, cold);
#endif
  parse_conf_file(KLINE_TYPE, cold);
  parse_conf_file(DLINE_TYPE, cold);
  parse_conf_file(XLINE_TYPE, cold);
  parse_conf_file(NRESV_TYPE, cold);
  parse_conf_file(CRESV_TYPE, cold);
}

/* parse_conf_file()
 *
 * inputs       - type of conf file to parse 
 * output       - none
 * side effects - conf file for givenconf type is opened and read then parsed
 */
static void
parse_conf_file(int type, int cold)
{
  FBFILE *file = NULL;
  const char *filename = get_conf_name(type);

  if ((file = fbopen(filename, "r")) == NULL)
  {
    if (cold)
      ilog(LOG_TYPE_IRCD, "Unable to read configuration file '%s': %s",
           filename, strerror(errno));
    else
      sendto_realops_flags(UMODE_ALL, L_ALL,
                    "Unable to read configuration file '%s': %s",
                           filename, strerror(errno));
  }
  else
  {
    parse_csv_file(file, type);
    fbclose(file);
  }
}

/* clear_out_old_conf()
 *
 * inputs       - none
 * output       - none
 * side effects - Clear out the old configuration
 */
static void
clear_out_old_conf(void)
{
  dlink_node *ptr = NULL, *next_ptr = NULL;
  struct ConfItem *conf;
  struct AccessItem *aconf;
  struct ClassItem *cltmp;
  struct MatchItem *match_item;
  dlink_list *free_items [] = {
    &server_items,   &oconf_items,    &hub_items, &leaf_items,
     &uconf_items,   &xconf_items, &rxconf_items, &rkconf_items,
     &nresv_items, &cluster_items,  &gdeny_items, &service_items, NULL
  };

  dlink_list ** iterator = free_items; /* C is dumb */

  /* We only need to free anything allocated by yyparse() here.
   * Resetting structs, etc, is taken care of by set_default_conf().
   */
  
  for (; *iterator != NULL; iterator++)
  {
    DLINK_FOREACH_SAFE(ptr, next_ptr, (*iterator)->head)
    {
      conf = ptr->data;
      /* XXX This is less than pretty */
      if (conf->type == SERVER_TYPE)
      {
        aconf = map_to_conf(conf);

        if (aconf->clients != 0)
        {
          SetConfIllegal(aconf);
          dlinkDelete(&conf->node, &server_items);
        }
        else
        {
          delete_conf_item(conf);
        }
      }
      else if (conf->type == OPER_TYPE)
      {
        aconf = map_to_conf(conf);

        if (aconf->clients != 0)
        {
          SetConfIllegal(aconf);
          dlinkDelete(&conf->node, &oconf_items);
        }
        else
        {
          delete_conf_item(conf);
        }
      }
      else if (conf->type == CLIENT_TYPE)
      {
        aconf = map_to_conf(conf);

        if (aconf->clients != 0)
        {
          SetConfIllegal(aconf);
        }
        else
        {
          delete_conf_item(conf);
        }
      }
      else if (conf->type == XLINE_TYPE  ||
               conf->type == RXLINE_TYPE ||
               conf->type == RKLINE_TYPE)
      {
        /* temporary (r)xlines are also on
         * the (r)xconf items list */
        if (conf->flags & CONF_FLAGS_TEMPORARY)
          continue;

        delete_conf_item(conf);
      }
      else
      {
        if ((conf->type == LEAF_TYPE) || (conf->type == HUB_TYPE))
        {
          match_item = map_to_conf(conf);
          if (match_item->ref_count <= 0)
            delete_conf_item(conf);
          else
          {
            match_item->illegal = 1;
            dlinkDelete(&conf->node, *iterator);
          }
        }
        else
          delete_conf_item(conf);
      }
    }
  }

  /*
   * 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_items.head)
  {
    cltmp = map_to_conf(ptr->data);

    if (ptr != class_items.tail)  /* never mark the "default" class */
      cltmp->active = 0;
  }

  clear_out_address_conf();

  /* clean out module paths */
  mod_clear_paths();

  /* 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;
  MyFree(ConfigFileEntry.egdpool_path);
  ConfigFileEntry.egdpool_path = NULL;
#ifdef HAVE_LIBCRYPTO
  if (ServerInfo.rsa_private_key != NULL)
  {
    RSA_free(ServerInfo.rsa_private_key);
    ServerInfo.rsa_private_key = NULL;
  }

  MyFree(ServerInfo.rsa_private_key_file);
  ServerInfo.rsa_private_key_file = NULL;
#endif

  /* clean out old resvs from the conf */
  clear_conf_resv();

  /* 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.service_name);
  ConfigFileEntry.service_name = NULL;

  delete_isupport("INVEX");
  delete_isupport("EXCEPTS");
}

/* flush_deleted_I_P()
 *
 * inputs       - none
 * output       - none
 * side effects - This function removes I/P conf items
 */
static void
flush_deleted_I_P(void)
{
  dlink_node *ptr;
  dlink_node *next_ptr;
  struct ConfItem *conf;
  struct AccessItem *aconf;
  dlink_list * free_items [] = {
    &server_items, &oconf_items, NULL
  };
  dlink_list ** iterator = free_items; /* C is dumb */

  /* flush out deleted I and P lines
   * although still in use.
   */
  for (; *iterator != NULL; iterator++)
  {
    DLINK_FOREACH_SAFE(ptr, next_ptr, (*iterator)->head)
    {
      conf = ptr->data;
      aconf = (struct AccessItem *)map_to_conf(conf);

      if (IsConfIllegal(aconf))
      {
        dlinkDelete(ptr, *iterator);

        if (aconf->clients == 0)
          delete_conf_item(conf);
      }
    }
  }
}

/* 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(ConfType type)
{
  switch (type)
  {
    case CONF_TYPE:
      return ConfigFileEntry.configfile;
      break;
    case KLINE_TYPE:
      return ConfigFileEntry.klinefile;
      break;
    case RKLINE_TYPE:
      return ConfigFileEntry.rklinefile;
      break;
    case DLINE_TYPE:
      return ConfigFileEntry.dlinefile;
      break;
    case XLINE_TYPE:
      return ConfigFileEntry.xlinefile;
      break;
    case RXLINE_TYPE:
      return ConfigFileEntry.rxlinefile;
      break;
    case CRESV_TYPE:
      return ConfigFileEntry.cresvfile;
      break;
    case NRESV_TYPE:
      return ConfigFileEntry.nresvfile;
      break;
    case GLINE_TYPE:
      return ConfigFileEntry.glinefile;
      break;

    default:
      return NULL;  /* This should NEVER HAPPEN since we call this function
                       only with the above values, this will cause us to core
                       at some point if this happens so we know where it was */
  }
}

#define BAD_PING (-1)

/* get_conf_ping()
 *
 * inputs       - pointer to struct AccessItem
 *              - pointer to a variable that receives ping warning time
 * output       - ping frequency
 * side effects - NONE
 */
static int
get_conf_ping(struct ConfItem *conf, int *pingwarn)
{
  struct ClassItem *aclass;
  struct AccessItem *aconf;

  if (conf != NULL)
  {
    aconf = (struct AccessItem *)map_to_conf(conf);
    if (aconf->class_ptr != NULL)
    {
      aclass = (struct ClassItem *)map_to_conf(aconf->class_ptr);
      *pingwarn = PingWarning(aclass);
      return PingFreq(aclass);
    }
  }

  return BAD_PING;
}

/* get_client_class()
 *
 * inputs       - pointer to client struct
 * output       - pointer to name of class
 * side effects - NONE
 */
const char *
get_client_class(struct Client *target_p)
{
  dlink_node *ptr;
  struct ConfItem *conf;
  struct AccessItem *aconf;

  if (target_p != NULL && !IsMe(target_p) &&
      target_p->localClient->confs.head != NULL)
  {
    DLINK_FOREACH(ptr, target_p->localClient->confs.head)
    {
      conf = ptr->data;

      if (conf->type == CLIENT_TYPE || conf->type == SERVER_TYPE ||
          conf->type == OPER_TYPE)
      {
        aconf = (struct AccessItem *) map_to_conf(conf);
        if (aconf->class_ptr != NULL)
          return aconf->class_ptr->name;
      }
    }
  }

  return "default";
}

/* get_client_ping()
 *
 * inputs       - pointer to client struct
 *              - pointer to a variable that receives ping warning time
 * output       - ping frequency
 * side effects - NONE
 */
int
get_client_ping(struct Client *target_p, int *pingwarn)
{
  int ping;
  struct ConfItem *conf;
  dlink_node *nlink;

  if (target_p->localClient->confs.head != NULL)
    DLINK_FOREACH(nlink, target_p->localClient->confs.head)
    {
      conf = nlink->data;

      if ((conf->type == CLIENT_TYPE) || (conf->type == SERVER_TYPE) ||
          (conf->type == OPER_TYPE))
      {
        ping = get_conf_ping(conf, pingwarn);
        if (ping > 0)
          return ping;
      }
    }

  *pingwarn = 0;
  return DEFAULT_PINGFREQUENCY;
}

/* find_class()
 *
 * inputs       - string name of class
 * output       - corresponding Class pointer
 * side effects - NONE
 */
struct ConfItem *
find_class(const char *classname)
{
  struct ConfItem *conf;

  if ((conf = find_exact_name_conf(CLASS_TYPE, NULL, classname, NULL, NULL)) != NULL)
    return conf;

  return class_default;
}

/* check_class()
 *
 * inputs       - NONE
 * output       - NONE
 * side effects - 
 */
void
check_class(void)
{
  dlink_node *ptr = NULL, *next_ptr = NULL;

  DLINK_FOREACH_SAFE(ptr, next_ptr, class_items.head)
  {
    struct ClassItem *aclass = map_to_conf(ptr->data);

    if (!aclass->active && !CurrUserCount(aclass))
    {
      destroy_cidr_class(aclass);
      delete_conf_item(ptr->data);
    }
  }
}

/* init_class()
 *
 * inputs       - NONE
 * output       - NONE
 * side effects - 
 */
void
init_class(void)
{
  struct ClassItem *aclass;

  class_default = make_conf_item(CLASS_TYPE);

  aclass = map_to_conf(class_default);
  aclass->active = 1;
  DupString(class_default->name, "default");
  ConFreq(aclass)  = DEFAULT_CONNECTFREQUENCY;
  PingFreq(aclass) = DEFAULT_PINGFREQUENCY;
  MaxTotal(aclass) = MAXIMUM_LINKS_DEFAULT;
  MaxSendq(aclass) = DEFAULT_SENDQ;

  client_check_cb = register_callback("check_client", check_client);
}

/* get_sendq()
 *
 * inputs       - pointer to client
 * output       - sendq for this client as found from its class
 * side effects - NONE
 */
unsigned int
get_sendq(struct Client *client_p)
{
  unsigned int sendq = DEFAULT_SENDQ;
  dlink_node *ptr;
  struct ConfItem *conf;
  struct ConfItem *class_conf;
  struct ClassItem *aclass;
  struct AccessItem *aconf;

  if (client_p && !IsMe(client_p) && (client_p->localClient->confs.head))
  {
    DLINK_FOREACH(ptr, client_p->localClient->confs.head)
    {
      conf = ptr->data;
      if ((conf->type == SERVER_TYPE) || (conf->type == OPER_TYPE)
          || (conf->type == CLIENT_TYPE))
      {
        aconf = (struct AccessItem *)map_to_conf(conf);
        if ((class_conf = aconf->class_ptr) == NULL)
          continue;
        aclass = (struct ClassItem *)map_to_conf(class_conf);
        sendq = MaxSendq(aclass);
        return sendq;
      }
    }
  }
  /* XXX return a default?
   * if here, then there wasn't an attached conf with a sendq
   * that is very bad -Dianora
   */
  return DEFAULT_SENDQ;
}

/* 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 *conf, const char *class_name)
{
  struct AccessItem *aconf = map_to_conf(conf);
  struct ClassItem *class = NULL;

  if (class_name == NULL) 
  {
    aconf->class_ptr = class_default;

    if (conf->type == CLIENT_TYPE)
      sendto_realops_flags(UMODE_ALL, L_ALL,
                           "Warning *** Defaulting to default class for %s@%s",
                           aconf->user, aconf->host);
    else
      sendto_realops_flags(UMODE_ALL, L_ALL,
                           "Warning *** Defaulting to default class for %s",
                           conf->name);
  }
  else
    aconf->class_ptr = find_class(class_name);

  if (aconf->class_ptr)
    class = map_to_conf(aconf->class_ptr);

  if (aconf->class_ptr == NULL || !class->active)
  {
    if (conf->type == CLIENT_TYPE)
      sendto_realops_flags(UMODE_ALL, L_ALL,
                           "Warning *** Defaulting to default class for %s@%s",
                           aconf->user, aconf->host);
    else
      sendto_realops_flags(UMODE_ALL, L_ALL,
                           "Warning *** Defaulting to default class for %s",
                           conf->name);
    aconf->class_ptr = class_default;
  }
}

/* conf_add_server()
 *
 * inputs       - pointer to config item
 *              - pointer to link count already on this conf
 * output       - NONE
 * side effects - Add a connect block
 */
int
conf_add_server(struct ConfItem *conf, const char *class_name)
{
  struct AccessItem *aconf;
  struct split_nuh_item nuh;
  char conf_user[USERLEN + 1];
  char conf_host[HOSTLEN + 1];

  aconf = map_to_conf(conf);

  conf_add_class_to_conf(conf, class_name);

  if (!aconf->host || !conf->name)
  {
    sendto_realops_flags(UMODE_ALL, L_ALL, "Bad connect block");
    ilog(LOG_TYPE_IRCD, "Bad connect block");
    return -1;
  }

  if (EmptyString(aconf->passwd))
  {
    sendto_realops_flags(UMODE_ALL, L_ALL, "Bad connect block, name %s",
                         conf->name);
    ilog(LOG_TYPE_IRCD, "Bad connect block, host %s", conf->name);
    return -1;
  }

  nuh.nuhmask  = aconf->host;
  nuh.nickptr  = NULL;
  nuh.userptr  = conf_user;
  nuh.hostptr  = conf_host;

  nuh.nicksize = 0;
  nuh.usersize = sizeof(conf_user);
  nuh.hostsize = sizeof(conf_host);

  split_nuh(&nuh);

  MyFree(aconf->host);
  aconf->host = NULL;

  DupString(aconf->user, conf_user); /* somehow username checking for servers
                                 got lost in H6/7, will have to be re-added */
  DupString(aconf->host, conf_host);

  lookup_confhost(conf);

  return 0;
}

/* 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[IRCD_BUFSIZE];

  if (conf_parser_ctx.pass != 1)
    return;

  strip_tabs(newlinebuf, linebuf, sizeof(newlinebuf));
  sendto_realops_flags(UMODE_ALL, L_ALL, "\"%s\", line %u: %s: %s",
                       conffilebuf, lineno + 1, msg, newlinebuf);
  ilog(LOG_TYPE_IRCD, "\"%s\", line %u: %s: %s",
       conffilebuf, lineno + 1, msg, newlinebuf);
}

int
conf_fbgets(char *lbuf, unsigned int max_size, FBFILE *fb)
{
  if (fbgets(lbuf, max_size, fb) == NULL)
    return 0;

  return strlen(lbuf);
}

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

/*
 * valid_tkline()
 * 
 * inputs       - pointer to ascii string to check
 *              - whether the specified time is in seconds or minutes
 * output       - -1 not enough parameters
 *              - 0 if not an integer number, else the number
 * side effects - none
 * Originally written by Dianora (Diane, db@db.net)
 */
time_t
valid_tkline(const char *p, int minutes)
{
  time_t result = 0;

  for (; *p; ++p)
  {
    if (!IsDigit(*p))
      return 0;

    result *= 10;
    result += ((*p) & 0xF);
  }

  /*
   * In the degenerate case where oper does a /quote kline 0 user@host :reason 
   * i.e. they specifically use 0, I am going to return 1 instead
   * as a return value of non-zero is used to flag it as a temporary kline
   */
  if (result == 0)
    result = 1;

  /* 
   * If the incoming time is in seconds convert it to minutes for the purpose
   * of this calculation
   */
  if (!minutes)
    result = result / (time_t)60; 

  if (result > MAX_TDKLINE_TIME)
    result = MAX_TDKLINE_TIME;

  result = result * (time_t)60;  /* turn it into seconds */

  return result;
}

/* valid_wild_card()
 *
 * input        - pointer to client
 *              - int flag, 0 for no warning oper 1 for warning oper
 *              - count of following varargs to check
 * output       - 0 if not valid, 1 if valid
 * side effects - NOTICE is given to source_p if warn is 1
 */
int
valid_wild_card(struct Client *source_p, int warn, int count, ...)
{
  char *p;
  char tmpch;
  int nonwild = 0;
  va_list args;

  /*
   * Now we must check the user and host to make sure there
   * are at least NONWILDCHARS non-wildcard characters in
   * them, otherwise assume they are attempting to kline
   * *@* or some variant of that. This code will also catch
   * people attempting to kline *@*.tld, as long as NONWILDCHARS
   * is greater than 3. In that case, there are only 3 non-wild
   * characters (tld), so if NONWILDCHARS is 4, the kline will
   * be disallowed.
   * -wnder
   */

  va_start(args, count);

  while (count--)
  {
    p = va_arg(args, char *);
    if (p == NULL)
      continue;

    while ((tmpch = *p++))
    {
      if (!IsKWildChar(tmpch))
      {
        /*
         * If we find enough non-wild characters, we can
         * break - no point in searching further.
         */
        if (++nonwild >= ConfigFileEntry.min_nonwildcard)
          return 1;
      }
    }
  }

  if (warn)
    sendto_one(source_p, ":%s NOTICE %s :Please include at least %d non-wildcard characters with the mask",
               me.name, source_p->name, ConfigFileEntry.min_nonwildcard);
  return 0;
}

/* XXX should this go into a separate file ? -Dianora */
/* parse_aline
