trunk/src/conf.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  s_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 "ircd_defs.h"
#include "tools.h"
#include "s_conf.h"
#include "s_serv.h"
#include "resv.h"
#include "s_stats.h"
#include "channel.h"
#include "client.h"
#include "common.h"
#include "event.h"
#include "hash.h"
#include "hook.h"
#include "irc_string.h"
#include "sprintf_irc.h"
#include "s_bsd.h"
#include "irc_getnameinfo.h"
#include "irc_getaddrinfo.h"
#include "ircd.h"
#include "list.h"
#include "listener.h"
#include "hostmask.h"
#include "modules.h"
#include "numeric.h"
#include "fdlist.h"
#include "s_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"

struct Callback *client_check_cb = NULL;
struct config_server_hide ConfigServerHide;

/* general conf items link list root, other than k lines etc. */
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 */
int ypass = 1; /* used by yyparse()      */

/* 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);

FBFILE *conf_fbfile_in = NULL;

/* 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;


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

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

  conf = (struct ConfItem *)((unsigned long)aconf -
                             (unsigned long)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, struct DNSReply *reply)
{
  struct AccessItem *aconf = (struct AccessItem *)vptr;
  struct ConfItem *conf;

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

  if (reply != NULL)
    memcpy(&aconf->ipnum, &reply->addr, sizeof(reply->addr));
  else {
    ilog(L_NOTICE, "Host not found: %s, ignoring connect{} block",
         aconf->host);
    conf = unmap_conf_item(aconf);
    sendto_realops_flags(UMODE_ALL, L_ALL,
                         "Ignoring connect{} block for %s - host not found",
                         conf->name);
    delete_conf_item(conf);
  }
}

/* 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_query == NULL)
  {
    aconf->dns_query = MyMalloc(sizeof(struct DNSQuery));
    aconf->dns_query->ptr = aconf;
    aconf->dns_query->callback = conf_dns_callback;
    gethost_byname(aconf->host, aconf->dns_query);
  }
}

/* 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;

  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;

  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 CLASS_TYPE:
    conf = (struct ConfItem *)MyMalloc(sizeof(struct ConfItem) +
                                       sizeof(struct ClassItem));
    dlinkAdd(conf, &conf->node, &class_items);
    aclass = (struct ClassItem *)map_to_conf(conf);
    ConFreq(aclass)  = DEFAULT_CONNECTFREQUENCY;
    PingFreq(aclass) = DEFAULT_PINGFREQUENCY;
    MaxTotal(aclass) = MAXIMUM_LINKS_DEFAULT;
    MaxSendq(aclass) = DEFAULT_SENDQ;
    CurrUserCount(aclass) = 0;
    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_query != NULL)
    {
      delete_resolver_queries(aconf->dns_query);
      MyFree(aconf->dns_query);
    }
    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->fakename);
#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;

  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;

  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;

  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;

  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;

  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 (IsOper(source_p))
        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));
    }
    break;

  case CONF_TYPE:
  case CLIENT_TYPE:
    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 (IsConfCryptLink(aconf))
        *p++ = 'C';
      if (IsConfLazyLink(aconf))
        *p++ = 'L';
      if (aconf->fakename)
        *p++ = 'M';
      if (IsConfTopicBurst(aconf))
        *p++ = 'T';
      if (IsConfCompressed(aconf))
        *p++ = 'Z';
      if (buf[0] == '\0')
        *p++ = '*';

      *p = '\0';

      /* Allow admins to see actual ips
       * unless hide_server_ips is enabled
       */
      if (!ConfigServerHide.hide_server_ips && IsAdmin(source_p))
        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:
    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(L_INFO, "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(L_INFO,"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(L_INFO,"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:
    {
      static char ipaddr[HOSTIPLEN];
      ServerStats->is_ref++;
      /* jdc - lists server name & port connections are on */
      /*       a purely cosmetical change */
      irc_getnameinfo((struct sockaddr*)&source_p->localClient->ip,
            source_p->localClient->ip.ss_len, ipaddr, HOSTIPLEN, NULL, 0,
            NI_NUMERICHOST);
      sendto_realops_flags(UMODE_UNAUTH, L_ALL,
                           "Unauthorized client connection from %s [%s] on [%s/%u].",
                           get_client_name(source_p, SHOW_IP),
                           ipaddr,
                           source_p->localClient->listener->name,
                           source_p->localClient->listener->port);
      ilog(L_INFO,
          "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;
    u_int32_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;
    u_int32_t *ip = (u_int32_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(int *number_ips_stored, unsigned long *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);
        if ((aclass_conf = ClassPtr(aconf)) != NULL)
        {
          aclass = map_to_conf(aclass_conf);

          if (conf->type == CLIENT_TYPE)
            remove_from_cidr_check(&client_p->localClient->ip, aclass);

          if (CurrUserCount(aclass) > 0)
            aclass->curr_user_count--;
          if (MaxTotal(aclass) < 0 && CurrUserCount(aclass) <= 0)
            delete_conf_item(aclass_conf);
        }

        /* Please, no ioccc entries - Dianora */
        if (aconf->clients > 0)
          --aconf->clients;
        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 = (struct AccessItem *)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)
        || irccmp(conf->name, name) )
      continue;
    if (type == OPER_TYPE)
    {
      struct ClassItem *aclass;

      aclass = (struct ClassItem *)aconf->class_ptr;
      if (aconf->clients < MaxTotal(aclass))
        return conf;
      else
        continue;
    }
    else
      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 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)
  {
    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;

  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 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 = (struct AccessItem *)map_to_conf(conf);
      if (EmptyString(conf->name))
        continue;
    
      if (irccmp(conf->name, name) == 0)
      {
        if ((user == NULL && (host == NULL)))
          return (conf);
        if (EmptyString(aconf->user) || EmptyString(aconf->host))
          return (conf);
        if (match(aconf->user, user) && match(aconf->host, host))
          return (conf);
      }
    }
    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");

#ifndef _WIN32
  restart_resolver();
#endif
  /* 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));

#ifndef STATIC_MODULES
  load_conf_modules();
#endif

  flush_deleted_I_P();

  rehashed_klines = 1;

  if (ConfigLoggingEntry.use_logging)
    reopen_log(logFileName);

  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;
  /* Don't reset hub, as that will break lazylinks */
  /* ServerInfo.hub = NO; */
  ServerInfo.dns_host.sin_addr.s_addr = 0;
  ServerInfo.dns_host.sin_port = 0;
  AdminInfo.name = NULL;
  AdminInfo.email = NULL;
  AdminInfo.description = NULL;

  set_log_level(L_NOTICE);
  ConfigLoggingEntry.use_logging = 1;
  ConfigLoggingEntry.operlog[0] = '\0';
  ConfigLoggingEntry.userlog[0] = '\0';
  ConfigLoggingEntry.klinelog[0] = '\0';
  ConfigLoggingEntry.glinelog[0] = '\0';
  ConfigLoggingEntry.killlog[0] = '\0';
  ConfigLoggingEntry.operspylog[0] = '\0';
  ConfigLoggingEntry.ioerrlog[0] = '\0';
  ConfigLoggingEntry.failed_operlog[0] = '\0';

  ConfigChannel.disable_fake_channels = NO;
  ConfigChannel.restrict_channels = NO;
  ConfigChannel.disable_local_channels = NO;
  ConfigChannel.use_invex = YES;
  ConfigChannel.use_except = YES;
  ConfigChannel.use_knock = YES;
  ConfigChannel.knock_delay = 300;
  ConfigChannel.knock_delay_channel = 60;
  ConfigChannel.max_chans_per_user = 15;
  ConfigChannel.quiet_on_ban = YES;
  ConfigChannel.max_bans = 25;
  ConfigChannel.default_split_user_count = 0;
  ConfigChannel.default_split_server_count = 0;
  ConfigChannel.no_join_on_split = NO;
  ConfigChannel.no_create_on_split = NO;
  ConfigChannel.burst_topicwho = YES;

  ConfigServerHide.flatten_links = NO;
  ConfigServerHide.links_delay = 300;
  ConfigServerHide.hidden = NO;
  ConfigServerHide.disable_hidden = NO;
  ConfigServerHide.hide_servers = NO;
  DupString(ConfigServerHide.hidden_name, NETWORK_NAME_DEFAULT);
  ConfigServerHide.hide_server_ips = NO;

  ConfigFileEntry.gline_min_cidr = 16;
  ConfigFileEntry.gline_min_cidr6 = 48;
  ConfigFileEntry.invisible_on_connect = YES;
  ConfigFileEntry.burst_away = NO;
  ConfigFileEntry.use_whois_actually = YES;
  ConfigFileEntry.tkline_expire_notices = YES;
  ConfigFileEntry.hide_spoof_ips = YES;
  ConfigFileEntry.ignore_bogus_ts = NO;
  ConfigFileEntry.disable_auth = NO;
  ConfigFileEntry.disable_remote = NO;
  ConfigFileEntry.kill_chase_time_limit = 90;
  ConfigFileEntry.default_floodcount = 8; /* XXX */
  ConfigFileEntry.failed_oper_notice = YES;
  ConfigFileEntry.dots_in_ident = 0;      /* XXX */
  ConfigFileEntry.dot_in_ip6_addr = YES;
  ConfigFileEntry.min_nonwildcard = 4;
  ConfigFileEntry.min_nonwildcard_simple = 3;
  ConfigFileEntry.max_accept = 20;
  ConfigFileEntry.anti_nick_flood = NO;   /* XXX */
  ConfigFileEntry.max_nick_time = 20;
  ConfigFileEntry.max_nick_changes = 5;
  ConfigFileEntry.anti_spam_exit_message_time = 0;  /* XXX */
  ConfigFileEntry.ts_warn_delta = TS_WARN_DELTA_DEFAULT;
  ConfigFileEntry.ts_max_delta = TS_MAX_DELTA_DEFAULT;  /* XXX */
  ConfigFileEntry.kline_with_reason = YES;
  ConfigFileEntry.kline_reason = NULL;
  ConfigFileEntry.warn_no_nline = YES;
  ConfigFileEntry.stats_o_oper_only = NO; /* XXX */
  ConfigFileEntry.stats_k_oper_only = 1;  /* masked */
  ConfigFileEntry.stats_i_oper_only = 1;  /* masked */
  ConfigFileEntry.stats_P_oper_only = NO;
  ConfigFileEntry.caller_id_wait = 60;
  ConfigFileEntry.opers_bypass_callerid = NO;
  ConfigFileEntry.pace_wait = 10;
  ConfigFileEntry.pace_wait_simple = 1;
  ConfigFileEntry.short_motd = NO;
  ConfigFileEntry.ping_cookie = NO;
  ConfigFileEntry.no_oper_flood = NO;     /* XXX */
  ConfigFileEntry.true_no_oper_flood = NO;  /* XXX */
  ConfigFileEntry.oper_pass_resv = YES;
  ConfigFileEntry.glines = NO;            /* XXX */
  ConfigFileEntry.gline_time = 12 * 3600; /* XXX */
  ConfigFileEntry.idletime = 0;
  ConfigFileEntry.max_targets = MAX_TARGETS_DEFAULT;
  ConfigFileEntry.client_flood = CLIENT_FLOOD_DEFAULT;
  ConfigFileEntry.oper_only_umodes = UMODE_DEBUG;  /* XXX */
  ConfigFileEntry.oper_umodes = UMODE_BOTS | UMODE_LOCOPS | UMODE_SERVNOTICE |
    UMODE_OPERWALL | UMODE_WALLOP;        /* XXX */
  DupString(ConfigFileEntry.servlink_path, SLPATH);
#ifdef HAVE_LIBCRYPTO
  /* jdc -- This is our default value for a cipher.  According to the
   *        CRYPTLINK document (doc/cryptlink.txt), BF/128 must be supported
   *        under all circumstances if cryptlinks are enabled.  So,
   *        this will be our default.
   *
   *        NOTE: I apologise for the hard-coded value of "1" (BF/128).
   *              This should be moved into a find_cipher() routine.
   */
  ConfigFileEntry.default_cipher_preference = &CipherTable[1];
#endif
  ConfigFileEntry.use_egd = NO;
  ConfigFileEntry.egdpool_path = NULL;
#ifdef HAVE_LIBZ
  ConfigFileEntry.compression_level = 0;
#endif
  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 */
  ypass = 1;
  yyparse();          /* pick up the classes first */

  fbrewind(file);

  ypass = 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 (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;
}

/* 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(L_ERROR, "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 (irc_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;
  irc_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[])
{
  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;
  }

  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);
        dlinkDelete(ptr, tklist);
        free_dlink_node(ptr);
        delete_conf_item(conf);
      }
    }
  }
}

/* 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 int hidden;
  const unsigned char c;
} flag_list[] = {
  { OPER_FLAG_ADMIN,       OPER_FLAG_HIDDEN_ADMIN,  'A' },
  { OPER_FLAG_REMOTEBAN,   0,                       'B' },
  { OPER_FLAG_DIE,         0,                       'D' },
  { OPER_FLAG_GLINE,       0,                       'G' },
  { OPER_FLAG_REHASH,      0,                       'H' },
  { OPER_FLAG_K,           0,                       'K' },
  { OPER_FLAG_OPERWALL,    0,                       'L' },
  { OPER_FLAG_N,           0,                       'N' },
  { OPER_FLAG_GLOBAL_KILL, 0,                       'O' },
  { OPER_FLAG_REMOTE,      0,                       'R' },
  { OPER_FLAG_OPER_SPY,    0,                       'S' },
  { OPER_FLAG_UNKLINE,     0,                       'U' },
  { OPER_FLAG_X,           0,                       'X' },
  { 0, 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) &&
        (port & flag_list[i].hidden) == 0)
      *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))
      {
        ircsprintf(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! */
  }

  ircsprintf(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];

  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 = fbopen(filename, "r")) == NULL)
  {
    if (cold)
    {
      ilog(L_CRIT, "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_fbfile_in);
  fbclose(conf_fbfile_in);

  add_isupport("NETWORK", ServerInfo.network_name, -1);
  ircsprintf(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);
  ircsprintf(chanlimit, "%s:%d", ConfigChannel.disable_local_channels ? "#" : "#&",
             ConfigChannel.max_chans_per_user);
  add_isupport("CHANLIMIT", chanlimit, -1);
  ircsprintf(chanmodes, "%s%s%s", ConfigChannel.use_except ? "e" : "",
             ConfigChannel.use_invex ? "I" : "", "b,k,l,imnpst");
  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();

  parse_conf_file(KLINE_TYPE, cold);
  parse_conf_file(RKLINE_TYPE, cold);
  parse_conf_file(DLINE_TYPE, cold);
  parse_conf_file(XLINE_TYPE, cold);
  parse_conf_file(RXLINE_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(L_ERROR, "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, 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 = (struct AccessItem *)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 = (struct AccessItem *)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 = (struct AccessItem *)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 = (struct MatchItem *)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)
  {
    conf = ptr->data;
    cltmp = (struct ClassItem *)map_to_conf(conf);
    if (ptr != class_items.tail)  /* never mark the "default" class */
      MaxTotal(cltmp) = -1;
  }

  clear_out_address_conf();

  /* clean out module paths */
#ifndef STATIC_MODULES
  mod_clear_paths();
#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;
  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.servlink_path);
  ConfigFileEntry.servlink_path = NULL;
#ifdef HAVE_LIBCRYPTO
  ConfigFileEntry.default_cipher_preference = NULL;
#endif /* HAVE_LIBCRYPTO */
  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, classname, NULL, NULL)) != NULL)
    return(conf);

  return class_default;
}

/* check_class()
 *
 * inputs       - NONE
 * output       - NONE
 * side effects - 
 */
void
check_class(void)
{
  dlink_node *ptr;
  dlink_node *next_ptr;
  struct ConfItem *conf;
  struct ClassItem *aclass;

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

    if (MaxTotal(aclass) < 0)
    {
      destroy_cidr_class(aclass);
      if (CurrUserCount(aclass) > 0)
        dlinkDelete(&conf->node, &class_items);
      else
        delete_conf_item(conf);
    }
  }
}

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

  class_default = make_conf_item(CLASS_TYPE);
  aclass = (struct ClassItem *)map_to_conf(class_default);
  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 long
get_sendq(struct Client *client_p)
{
  unsigned long 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;
  struct ClassItem *aclass;

  aconf = (struct AccessItem *)map_to_conf(conf);

  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 == NULL)
  {
    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;
  }
  else
  {
    aclass = (struct ClassItem *)map_to_conf(aconf->class_ptr);
    if (MaxTotal(aclass) < 0)
    {
      aconf->class_ptr = class_default;
    }
  }
}

#define MAXCONFLINKS 150

/* 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(L_WARN, "Bad connect block");
    return -1;
  }

  if (EmptyString(aconf->passwd) && !IsConfCryptLink(aconf))
  {
    sendto_realops_flags(UMODE_ALL, L_ALL, "Bad connect block, name %s",
                         conf->name);
    ilog(L_WARN, "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;
}

/* conf_add_d_conf()
 *
 * inputs       - pointer to config item
 * output       - NONE
 * side effects - Add a d/D line
 */
void
conf_add_d_conf(struct AccessItem *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_WARN, "Invalid Dline %s ignored", aconf->host);
    free_access_item(aconf);
  }
  else
  {
    /* XXX ensure user is NULL */
    MyFree(aconf->user);
    aconf->user = NULL;
    add_conf_by_address(CONF_DLINE, 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[IRCD_BUFSIZE];

  if (ypass != 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(L_WARN, "\"%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(char *p, int minutes)
{
  time_t result = 0;

  while (*p)
  {
    if (IsDigit(*p))
    {
      result *= 10;
      result += ((*p) & 0xF);
      p++;
    }
    else
      return 0;
  }

  /* 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
 *
 * input        - pointer to cmd name being used
 *              - pointer to client using cmd
 *              - parc parameter count
 *              - parv[] list of parameters to parse
 *              - parse_flags bit map of things to test
 *              - pointer to user or string to parse into
 *              - pointer to host or NULL to parse into if non NULL
 *              - pointer to optional tkline time or NULL 
 *              - pointer to target_server to parse into if non NULL
 *              - pointer to reason to parse into
 *
 * output       - 1 if valid, -1 if not valid
 * side effects - A generalised k/d/x etc. line parser,
 *               "ALINE [time] user@host|string [ON] target :reason"
 *                will parse returning a parsed user, host if
 *                h_p pointer is non NULL, string otherwise.
 *                if tkline_time pointer is non NULL a tk line will be set
 *                to non zero if found.
 *                if tkline_time pointer is NULL and tk line is found,
 *                error is reported.
 *                if target_server is NULL and an "ON" is found error
 *                is reported.
 *                if reason pointer is NULL ignore pointer,
 *                this allows usee of parse_a_line in unkline etc.
 *
 * - Dianora
 */
int
parse_aline(const char *cmd, struct Client *source_p,
            int parc, char **parv,
            int parse_flags, char **up_p, char **h_p, time_t *tkline_time, 
            char **target_server, char **reason)
{
  int found_tkline_time=0;
  static char def_reason[] = "No Reason";
  static char user[USERLEN*4+1];
  static char host[HOSTLEN*4+1];

  parv++;
  parc--;

  found_tkline_time = valid_tkline(*parv, TK_MINUTES);

  if (found_tkline_time != 0)
  {
    parv++;
    parc--;

    if (tkline_time != NULL)
      *tkline_time = found_tkline_time;
    else
    {
      sendto_one(source_p, ":%s NOTICE %s :temp_line not supported by %s",
                 me.name, source_p->name, cmd);
      return -1;
    }
  }

  if (parc == 0)
  {
    sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS),
               me.name, source_p->name, cmd);
    return -1;
  }

  if (h_p == NULL)
    *up_p = *parv;
  else
  {
    if (find_user_host(source_p, *parv, user, host, parse_flags) == 0)
      return -1;

    *up_p = user;
    *h_p = host;
  }
 
  parc--;
  parv++;

  if (parc != 0)
  {
    if (irccmp(*parv, "ON") == 0)
    {
      parc--;
      parv++;

      if (target_server == NULL)
      {
        sendto_one(source_p, ":%s NOTICE %s :ON server not supported by %s",
                   me.name, source_p->name, cmd);
        return -1;
      }

      if (!IsOperRemoteBan(source_p))
      {
        sendto_one(source_p, form_str(ERR_NOPRIVS),
                   me.name, source_p->name, "remoteban");
        return -1;
      }

      if (parc == 0 || EmptyString(*parv))
      {
        sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS),
                   me.name, source_p->name, cmd);
        return -1;
      }

      *target_server = *parv;
      parc--;
      parv++;
    }
    else
    {
      /* Make sure target_server *is* NULL if no ON server found
       * caller probably NULL'd it first, but no harm to do it again -db
       */
      if (target_server != NULL)
        *target_server = NULL;
    }
  }

  if (h_p != NULL)
  {
    if (strchr(user, '!') != NULL)
    {
      sendto_one(source_p, ":%s NOTICE %s :Invalid character '!' in kline",
                 me.name, source_p->name);
      return -1;
    }

    if ((parse_flags & AWILD) && !valid_wild_card(source_p, YES, 2, *up_p, *h_p))
      return -1;
  }
  else
    if ((parse_flags & AWILD) && !valid_wild_card(source_p, YES, 1, *up_p))
      return -1;

  if (reason != NULL)
  {
    if (parc != 0)
    {
      *reason = *parv;
      if (!valid_comment(source_p, *reason, YES))
        return -1;
    }
    else
      *reason = def_reason;
  }

  return 1;
}

/* find_user_host()
 *
 * inputs       - pointer to client placing kline
 *              - pointer to user_host_or_nick
 *              - pointer to user buffer
 *              - pointer to host buffer
 * output       - 0 if not ok to kline, 1 to kline i.e. if valid user host
 * side effects -
 */
static int
find_user_host(struct Client *source_p, char *user_host_or_nick,
               char *luser, char *lhost, unsigned int flags)
{
  struct Client *target_p = NULL;
  char *hostp = NULL;

  if (lhost == NULL)
  {
    strlcpy(luser, user_host_or_nick, USERLEN*4 + 1);
    return 1;
  }

  if ((hostp = strchr(user_host_or_nick, '@')) || *user_host_or_nick == '*')
  {
    /* Explicit user@host mask given */

    if (hostp != NULL)                            /* I'm a little user@host */
    {
      *(hostp++) = '\0';                       /* short and squat */
      if (*user_host_or_nick)
        strlcpy(luser, user_host_or_nick, USERLEN*4 + 1); /* here is my user */
      else
        strcpy(luser, "*");
      if (*hostp)
        strlcpy(lhost, hostp, HOSTLEN + 1);    /* here is my host */
      else
        strcpy(lhost, "*");
    }
    else
    {
      luser[0] = '*';             /* no @ found, assume its *@somehost */
      luser[1] = '\0';    
      strlcpy(lhost, user_host_or_nick, HOSTLEN*4 + 1);
    }
    
    return 1;
  }
  else if (!(flags & NOUSERLOOKUP))
  {
    /* Try to find user@host mask from nick */
    /* Okay to use source_p as the first param, because source_p == client_p */
    if ((target_p = 
        find_chasing(source_p, source_p, user_host_or_nick, NULL)) == NULL)
      return 0;

    if (IsExemptKline(target_p))
    {
      if (!IsServer(source_p))
        sendto_one(source_p,
                   ":%s NOTICE %s :%s is E-lined",
                   me.name, source_p->name, target_p->name);
      return 0;
    }

    /*
     * turn the "user" bit into "*user", blow away '~'
     * if found in original user name (non-idented)
     */
    strlcpy(luser, target_p->username, USERLEN*4 + 1);

    if (target_p->username[0] == '~')
      luser[0] = '*';

    if (target_p->sockhost[0] == '\0' ||
        (target_p->sockhost[0] == '0' && target_p->sockhost[1] == '\0'))
      strlcpy(lhost, target_p->host, HOSTLEN*4 + 1);
    else
      strlcpy(lhost, target_p->sockhost, HOSTLEN*4 + 1);
    return 1;
  }

  return 0;
}

/* valid_comment()
 *
 * inputs       - pointer to client
 *              - pointer to comment
 * output       - 0 if no valid comment,
 *              - 1 if valid
 * side effects - truncates reason where necessary
 */
int
valid_comment(struct Client *source_p, char *comment, int warn)
{
  if (strchr(comment, '"'))
  {
    if (warn)
      sendto_one(source_p, ":%s NOTICE %s :Invalid character '\"' in comment",
                 me.name, source_p->name);
    return 0;
  }

  if (strlen(comment) > REASONLEN)
    comment[REASONLEN-1] = '\0';

  return 1;
}

/* match_conf_password()
 *
 * inputs       - pointer to given password
 *              - pointer to Conf
 * output       - 1 or 0 if match
 * side effects - none
 */
int
match_conf_password(const char *password, const struct AccessItem *aconf)
{
  const char *encr = NULL;

  if (password == NULL || aconf->passwd == NULL)
    return 0;

  if (aconf->flags & CONF_FLAGS_ENCRYPTED)
  {
    /* use first two chars of the password they send in as salt */
    /* If the password in the conf is MD5, and ircd is linked
     * to scrypt on FreeBSD, or the standard crypt library on
     * glibc Linux, then this code will work fine on generating
     * the proper encrypted hash for comparison.
     */
    if (*aconf->passwd)
      encr = crypt(password, aconf->passwd);
    else
      encr = "";
  }
  else
    encr = password;

  return !strcmp(encr, aconf->passwd);
}

/*
 * cluster_a_line
 *
 * inputs       - client sending the cluster
 *              - command name "KLINE" "XLINE" etc.
 *              - capab -- CAP_KLN etc. from s_serv.h
 *              - cluster type -- CLUSTER_KLINE etc. from s_conf.h
 *              - pattern and args to send along
 * output       - none
 * side effects - Take source_p send the pattern with args given
 *                along to all servers that match capab and cluster type
*/
void
cluster_a_line(struct Client *source_p, const char *command,
               int capab, int cluster_type, const char *pattern, ...)
{
  va_list args;
  char buffer[IRCD_BUFSIZE];
  const dlink_node *ptr = NULL;

  va_start(args, pattern);
  vsnprintf(buffer, sizeof(buffer), pattern, args);
  va_end(args);

  DLINK_FOREACH(ptr, cluster_items.head)
  {
    const struct ConfItem *conf = ptr->data;

    if (conf->flags & cluster_type)
      sendto_match_servs(source_p, conf->name, CAP_CLUSTER|capab,
                         "%s %s %s", command, conf->name, buffer);
  }
}

/*
 * split_nuh
 *
 * inputs       - pointer to original mask (modified in place)
 *              - pointer to pointer where nick should go
 *              - pointer to pointer where user should go
 *              - pointer to pointer where host should go
 * output       - NONE
 * side effects - mask is modified in place
 *                If nick pointer is NULL, ignore writing to it
 *                this allows us to use this function elsewhere.
 *
 * mask                         nick    user    host
 * ----------------------       ------- ------- ------
 * Dianora!db@db.net            Dianora db      db.net
 * Dianora                      Dianora *       *
 * db.net                       *       *       db.net
 * OR if nick pointer is NULL
 * Dianora                      -       *       Dianora
 * Dianora!                     Dianora *       *
 * Dianora!@                    Dianora *       *
 * Dianora!db                   Dianora db      *
 * Dianora!@db.net              Dianora *       db.net
 * db@db.net                    *       db      db.net
 * !@                           *       *       *
 * @                            *       *       *
 * !                            *       *       *
 */
void
split_nuh(struct split_nuh_item *const iptr)
{
  char *p = NULL, *q = NULL;

  if (iptr->nickptr)
    strlcpy(iptr->nickptr, "*", iptr->nicksize);
  if (iptr->userptr)
    strlcpy(iptr->userptr, "*", iptr->usersize);
  if (iptr->hostptr)
    strlcpy(iptr->hostptr, "*", iptr->hostsize);

  if ((p = strchr(iptr->nuhmask, '!')))
  {
    *p = '\0';

    if (iptr->nickptr && *iptr->nuhmask != '\0')
      strlcpy(iptr->nickptr, iptr->nuhmask, iptr->nicksize);

    if ((q = strchr(++p, '@'))) {
      *q++ = '\0';

      if (*p != '\0')
        strlcpy(iptr->userptr, p, iptr->usersize);

      if (*q != '\0')
        strlcpy(iptr->hostptr, q, iptr->hostsize);
    }
    else
    {
      if (*p != '\0')
        strlcpy(iptr->userptr, p, iptr->usersize);
    }
  }
  else
  {
    /* No ! found so lets look for a user@host */
    if ((p = strchr(iptr->nuhmask, '@')))
    {
      /* if found a @ */
      *p++ = '\0';

      if (*iptr->nuhmask != '\0')
        strlcpy(iptr->userptr, iptr->nuhmask, iptr->usersize);

      if (*p != '\0')
        strlcpy(iptr->hostptr, p, iptr->hostsize);
    }
    else
    {
      /* no @ found */
      if (!iptr->nickptr || strpbrk(iptr->nuhmask, ".:"))
        strlcpy(iptr->hostptr, iptr->nuhmask, iptr->hostsize);
      else
        strlcpy(iptr->nickptr, iptr->nuhmask, iptr->nicksize);
    }
  }
}

/*
 * flags_to_ascii
 *
 * inputs       - flags is a bitmask
 *              - pointer to table of ascii letters corresponding
 *                to each bit
 *              - flag 1 for convert ToLower if bit missing 
 *                0 if ignore.
 * output       - none
 * side effects - string pointed to by p has bitmap chars written to it
 */
static void
flags_to_ascii(unsigned int flags, const unsigned int bit_table[], char *p,
               int lowerit)
{
  unsigned int mask = 1;
  int i = 0;

  for (mask = 1; (mask != 0) && (bit_table[i] != 0); mask <<= 1, i++)
  {
    if (flags & mask)
      *p++ = bit_table[i];
    else if (lowerit)
      *p++ = ToLower(bit_table[i]);
  }
  *p = '\0';
}

/*
 * cidr_limit_reached
 *
 * inputs       - int flag allowing over_rule of limits
 *              - pointer to the ip to be added
 *              - pointer to the class
 * output       - non zero if limit reached
 *                0 if limit not reached
 * side effects -
 */
static int
cidr_limit_reached(int over_rule,
                   struct irc_ssaddr *ip, struct ClassItem *aclass)
{
  dlink_node *ptr = NULL;
  struct CidrItem *cidr;

  if (NumberPerCidr(aclass) <= 0)
    return 0;

  if (ip->ss.ss_family == AF_INET)
  {
    if (CidrBitlenIPV4(aclass) <= 0)
      return 0;

    DLINK_FOREACH(ptr, aclass->list_ipv4.head)
    {
      cidr = ptr->data;
      if (match_ipv4(ip, &cidr->mask, CidrBitlenIPV4(aclass)))
      {
        if (!over_rule && (cidr->number_on_this_cidr >= NumberPerCidr(aclass)))
          return -1;
        cidr->number_on_this_cidr++;
        return 0;
      }
    }
    cidr = MyMalloc(sizeof(struct CidrItem));
    cidr->number_on_this_cidr = 1;
    cidr->mask = *ip;
    mask_addr(&cidr->mask, CidrBitlenIPV4(aclass));
    dlinkAdd(cidr, &cidr->node, &aclass->list_ipv4);
  }
#ifdef IPV6
  else if (CidrBitlenIPV6(aclass) > 0)
  {
    DLINK_FOREACH(ptr, aclass->list_ipv6.head)
    {
      cidr = ptr->data;
      if (match_ipv6(ip, &cidr->mask, CidrBitlenIPV6(aclass)))
      {
        if (!over_rule && (cidr->number_on_this_cidr >= NumberPerCidr(aclass)))
          return -1;
        cidr->number_on_this_cidr++;
        return 0;
      }
    }
    cidr = MyMalloc(sizeof(struct CidrItem));
    cidr->number_on_this_cidr = 1;
    cidr->mask = *ip;
    mask_addr(&cidr->mask, CidrBitlenIPV6(aclass));
    dlinkAdd(cidr, &cidr->node, &aclass->list_ipv6);
  }
#endif
  return 0;
}

/*
 * remove_from_cidr_check
 *
 * inputs       - pointer to the ip to be removed
 *              - pointer to the class
 * output       - NONE
 * side effects -
 */
static void
remove_from_cidr_check(struct irc_ssaddr *ip, struct ClassItem *aclass)
{
  dlink_node *ptr = NULL;
  dlink_node *next_ptr = NULL;
  struct CidrItem *cidr;

  if (NumberPerCidr(aclass) == 0)
    return;

  if (ip->ss.ss_family == AF_INET)
  {
    if (CidrBitlenIPV4(aclass) <= 0)
      return;

    DLINK_FOREACH_SAFE(ptr, next_ptr, aclass->list_ipv4.head)
    {
      cidr = ptr->data;
      if (match_ipv4(ip, &cidr->mask, CidrBitlenIPV4(aclass)))
      {
        cidr->number_on_this_cidr--;
        if (cidr->number_on_this_cidr == 0)
        {
          dlinkDelete(ptr, &aclass->list_ipv4);
          MyFree(cidr);
          return;
        }
      }
    }
  }
#ifdef IPV6
  else if (CidrBitlenIPV6(aclass) > 0)
  {
    DLINK_FOREACH_SAFE(ptr, next_ptr, aclass->list_ipv6.head)
    {
      cidr = ptr->data;
      if (match_ipv6(ip, &cidr->mask, CidrBitlenIPV6(aclass)))
      {
        cidr->number_on_this_cidr--;
        if (cidr->number_on_this_cidr == 0)
        {
          dlinkDelete(ptr, &aclass->list_ipv6);
          MyFree(cidr);
          return;
        }
      }
    }
  }
#endif
}

static void
rebuild_cidr_list(int aftype, struct ConfItem *oldcl, struct ClassItem *newcl,
                  dlink_list *old_list, dlink_list *new_list, int changed)
{
  dlink_node *ptr;
  struct Client *client_p;
  struct ConfItem *conf;
  struct AccessItem *aconf;

  if (!changed)
  {
    *new_list = *old_list;
    old_list->head = old_list->tail = NULL;
    old_list->length = 0;
    return;
  }

  DLINK_FOREACH(ptr, local_client_list.head)
  {
    client_p = ptr->data;
    if (client_p->localClient->aftype != aftype)
      continue;
    if (dlink_list_length(&client_p->localClient->confs) == 0)
      continue;

    conf = client_p->localClient->confs.tail->data;
    if (conf->type == CLIENT_TYPE)
    {
      aconf = map_to_conf(conf);
      if (aconf->class_ptr == oldcl)
        cidr_limit_reached(1, &client_p->localClient->ip, newcl);
    }
  }
}

/*
 * rebuild_cidr_class
 *
 * inputs       - pointer to old conf
 *              - pointer to new_class
 * output       - none
 * side effects - rebuilds the class link list of cidr blocks
 */
void
rebuild_cidr_class(struct ConfItem *conf, struct ClassItem *new_class)
{
  struct ClassItem *old_class = map_to_conf(conf);

  if (NumberPerCidr(old_class) > 0 && NumberPerCidr(new_class) > 0)
  {
    if (CidrBitlenIPV4(old_class) > 0 && CidrBitlenIPV4(new_class) > 0)
      rebuild_cidr_list(AF_INET, conf, new_class,
                        &old_class->list_ipv4, &new_class->list_ipv4,
                        CidrBitlenIPV4(old_class) != CidrBitlenIPV4(new_class));

#ifdef IPV6
    if (CidrBitlenIPV6(old_class) > 0 && CidrBitlenIPV6(new_class) > 0)
      rebuild_cidr_list(AF_INET6, conf, new_class,
                        &old_class->list_ipv6, &new_class->list_ipv6,
                        CidrBitlenIPV6(old_class) != CidrBitlenIPV6(new_class));
#endif
  }

  destroy_cidr_class(old_class);
}

/*
 * destroy_cidr_list
 *
 * inputs       - pointer to class dlink list of cidr blocks
 * output       - none
 * side effects - completely destroys the class link list of cidr blocks
 */
static void
destroy_cidr_list(dlink_list *list)
{
  dlink_node *ptr = NULL;
  dlink_node *next_ptr = NULL;
  struct CidrItem *cidr;

  DLINK_FOREACH_SAFE(ptr, next_ptr, list->head)
  {
    cidr = ptr->data;
    dlinkDelete(ptr, list);
    MyFree(cidr);
  }
}

/*
 * destroy_cidr_class
 *
 * inputs       - pointer to class
 * output       - none
 * side effects - completely destroys the class link list of cidr blocks
 */
static void
destroy_cidr_class(struct ClassItem *aclass)
{
  destroy_cidr_list(&aclass->list_ipv4);
  destroy_cidr_list(&aclass->list_ipv6);
}
Revision:	632
Committed:	Thu Jun 1 10:53:00 2006 UTC (19 years, 3 months ago) by michael
Content type:	text/x-csrc
Original Path:	*ircd-hybrid-7.2/src/s_conf.c*
File size:	101434 byte(s)
Log Message:	- Added channel::disable_fake_channels which disallows creation of channels that have ascii 2, 3, 31 and 160 in their names. - Minor improvements and cleanups to channel name validation routines backported from 7.3