/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2014 ircd-hybrid development team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 */

/*! \file m_kline.c
 * \brief Includes required functions for processing the KLINE/UNKLINE command.
 * \version $Id$
 */

#include "stdinc.h"
#include "list.h"
#include "channel.h"
#include "client.h"
#include "irc_string.h"
#include "ircd.h"
#include "conf.h"
#include "hostmask.h"
#include "numeric.h"
#include "fdlist.h"
#include "s_bsd.h"
#include "log.h"
#include "s_misc.h"
#include "send.h"
#include "hash.h"
#include "s_serv.h"
#include "s_gline.h"
#include "parse.h"
#include "modules.h"
#include "conf_db.h"
#include "memory.h"


static void
check_kline(struct AddressRec *arec)
{
  dlink_node *ptr = NULL, *ptr_next = NULL;

  DLINK_FOREACH_SAFE(ptr, ptr_next, local_client_list.head)
  {
    struct Client *client_p = ptr->data;

    if (IsDead(client_p))
      continue;

    if (match(arec->username, client_p->username))
      continue;

    switch (arec->masktype)
    {
      case HM_IPV4:
        if (client_p->localClient->aftype == AF_INET)
          if (match_ipv4(&client_p->localClient->ip, &arec->Mask.ipa.addr, arec->Mask.ipa.bits))
            conf_try_ban(client_p, arec->conf);
        break;
      case HM_IPV6:
        if (client_p->localClient->aftype == AF_INET6)
          if (match_ipv6(&client_p->localClient->ip, &arec->Mask.ipa.addr, arec->Mask.ipa.bits))
            conf_try_ban(client_p, arec->conf);
        break;
      default:  /* HM_HOST */
        if (!match(arec->Mask.hostname, client_p->host))
          conf_try_ban(client_p, arec->conf);
        break;
    }
  }
}

/* apply_tkline()
 *
 * inputs       -
 * output       - NONE
 * side effects - tkline as given is placed
 */
static void
m_kline_add_kline(struct Client *source_p, struct MaskItem *conf,
                  time_t tkline_time)
{
  if (tkline_time)
  {
    conf->until = CurrentTime + tkline_time;
    sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE,
                         "%s added temporary %d min. K-Line for [%s@%s] [%s]",
                         get_oper_name(source_p), tkline_time/60,
                         conf->user, conf->host,
                         conf->reason);
    sendto_one(source_p, ":%s NOTICE %s :Added temporary %d min. K-Line [%s@%s]",
               MyConnect(source_p) ? me.name : ID_or_name(&me, source_p),
               source_p->name, tkline_time/60, conf->user, conf->host);
    ilog(LOG_TYPE_KLINE, "%s added temporary %d min. K-Line for [%s@%s] [%s]",
         get_oper_name(source_p), tkline_time/60,
         conf->user, conf->host, conf->reason);
  }
  else
  {
    sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE,
                         "%s added K-Line for [%s@%s] [%s]",
                         get_oper_name(source_p),
                         conf->user, conf->host, conf->reason);
    sendto_one(source_p, ":%s NOTICE %s :Added K-Line [%s@%s]",
               MyConnect(source_p) ? me.name : ID_or_name(&me, source_p),
               source_p->name, conf->user, conf->host);
    ilog(LOG_TYPE_KLINE, "%s added K-Line for [%s@%s] [%s]",
         get_oper_name(source_p), conf->user, conf->host, conf->reason);
  }

  conf->setat = CurrentTime;
  SetConfDatabase(conf);

  check_kline(add_conf_by_address(CONF_KLINE, conf));
}

/* static int remove_tkline_match(const char *host, const char *user)
 * Input: A hostname, a username to unkline.
 * Output: returns YES on success, NO if no tkline removed.
 * Side effects: Any matching tklines are removed.
 */
static int
remove_kline_match(const char *host, const char *user)
{
  struct irc_ssaddr iphost, *piphost;
  struct MaskItem *conf;
  int t = 0;
  int aftype = 0;

  if ((t = parse_netmask(host, &iphost, NULL)) != HM_HOST)
  {
#ifdef IPV6
    if (t == HM_IPV6)
      aftype = AF_INET6;
    else
#endif
      aftype = AF_INET;
    piphost = &iphost;
  }
  else
    piphost = NULL;

  if ((conf = find_conf_by_address(host, piphost, CONF_KLINE, aftype, user, NULL, 0)))
  {
    if (IsConfDatabase(conf))
    {
      delete_one_address_conf(host, conf);
      return 1;
    }
  }

  return 0;
}

/* already_placed_kline()
 * inputs       - user to complain to, username & host to check for
 * outputs      - returns 1 on existing K-line, 0 if doesn't exist
 * side effects - notifies source_p if the K-line already exists
 */
/*
 * Note: This currently works if the new K-line is a special case of an
 *       existing K-line, but not the other way round. To do that we would
 *       have to walk the hash and check every existing K-line. -A1kmm.
 */
static int
already_placed_kline(struct Client *source_p, const char *luser, const char *lhost, int warn)
{
  const char *reason;
  struct irc_ssaddr iphost, *piphost;
  struct MaskItem *conf = NULL;
  int t = 0;
  int aftype = 0;

  if ((t = parse_netmask(lhost, &iphost, NULL)) != HM_HOST)
  {
#ifdef IPV6
    if (t == HM_IPV6)
      aftype = AF_INET6;
    else
#endif
      aftype = AF_INET;
    piphost = &iphost;
  }
  else
    piphost = NULL;

  if ((conf = find_conf_by_address(lhost, piphost, CONF_KLINE, aftype, luser, NULL, 0)))
  {
    if (warn)
    {
      reason = conf->reason ? conf->reason : CONF_NOREASON;
      sendto_one(source_p,
                 ":%s NOTICE %s :[%s@%s] already K-Lined by [%s@%s] - %s",
                 me.name, source_p->name, luser, lhost, conf->user,
                 conf->host, reason);
    }

    return 1;
  }

  return 0;
}

/* mo_kline()
 *
 * inputs	- pointer to server
 *		- pointer to client
 *		- parameter count
 *		- parameter list
 * output	-
 * side effects - k line is added
 */
static int
mo_kline(struct Client *client_p, struct Client *source_p,
         int parc, char *parv[])
{
  char buffer[IRCD_BUFSIZE];
  char *reason = NULL;
  char *user = NULL;
  char *host = NULL;
  const char *current_date;
  char *target_server = NULL;
  struct MaskItem *conf;
  time_t tkline_time = 0;
  time_t cur_time;

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

  if (parse_aline("KLINE", source_p, parc, parv, AWILD, &user, &host,
                  &tkline_time, &target_server, &reason) < 0)
    return 0;

  if (target_server != NULL)
  {
    sendto_match_servs(source_p, target_server, CAP_KLN, "KLINE %s %lu %s %s :%s",
                       target_server, (unsigned long)tkline_time,
                       user, host, reason);

    /* Allow ON to apply local kline as well if it matches */
    if (match(target_server, me.name))
      return 0;
  }
  else
    cluster_a_line(source_p, "KLINE", CAP_KLN, SHARED_KLINE,
                   "%d %s %s :%s", tkline_time, user, host, reason);

  if (already_placed_kline(source_p, user, host, 1))
    return 0;

  cur_time = CurrentTime;
  current_date = smalldate(cur_time);
  conf = conf_make(CONF_KLINE);

  conf->host = xstrdup(host);
  conf->user = xstrdup(user);

  if (tkline_time != 0)
    snprintf(buffer, sizeof(buffer), "Temporary K-line %d min. - %s (%s)",
             (int)(tkline_time/60), reason, current_date);
  else
    snprintf(buffer, sizeof(buffer), "%s (%s)", reason, current_date);

  conf->reason = xstrdup(buffer);
  m_kline_add_kline(source_p, conf, tkline_time);
  return 0;
}

/* me_kline - handle remote kline. no propagation */
static int
me_kline(struct Client *client_p, struct Client *source_p,
         int parc, char *parv[])
{
  char buffer[IRCD_BUFSIZE];
  struct MaskItem *conf = NULL;
  int tkline_time = 0;
  const char *current_date;
  time_t cur_time;
  char *kuser, *khost, *kreason;

  if (parc != 6 || EmptyString(parv[5]))
    return 0;

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

  tkline_time = valid_tkline(parv[2], TK_SECONDS);
  kuser = parv[3];
  khost = parv[4];
  kreason = parv[5];

  cur_time = CurrentTime;
  current_date = smalldate(cur_time);

  if (HasFlag(source_p, FLAGS_SERVICE) ||
      find_matching_name_conf(CONF_ULINE, source_p->servptr->name,
                              source_p->username, source_p->host,
                              SHARED_KLINE))
  {
    if (!IsClient(source_p) ||
        already_placed_kline(source_p, kuser, khost, 1))
      return 0;

    conf = conf_make(CONF_KLINE);
    conf->host = xstrdup(khost);
    conf->user = xstrdup(kuser);

    if (tkline_time != 0)
      snprintf(buffer, sizeof(buffer), "Temporary K-line %d min. - %s (%s)",
               (int)(tkline_time/60), kreason, current_date);
    else
      snprintf(buffer, sizeof(buffer), "%s (%s)", kreason, current_date);

    conf->reason = xstrdup(buffer);
    m_kline_add_kline(source_p, conf, tkline_time);
  }

  return 0;
}

static int
ms_kline(struct Client *client_p, struct Client *source_p,
         int parc, char *parv[])
{
  if (parc != 6 || EmptyString(parv[5]))
    return 0;

  /* parv[0]  parv[1]        parv[2]      parv[3]  parv[4]  parv[5] */
  /* oper     target_server  tkline_time  user     host     reason */
  sendto_match_servs(source_p, parv[1], CAP_KLN, "KLINE %s %s %s %s :%s",
                     parv[1], parv[2], parv[3], parv[4], parv[5]);

  return me_kline(client_p, source_p, parc, parv);
}

/*
** mo_unkline
** Added Aug 31, 1997 
** common (Keith Fralick) fralick@gate.net
**
**      parv[0] = sender
**      parv[1] = address to remove
*
*
*/
static int
mo_unkline(struct Client *client_p, struct Client *source_p,
           int parc, char *parv[])
{
  char *target_server = NULL;
  char *user, *host;

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

  if (EmptyString(parv[1]))
  {
    sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS),
               me.name, source_p->name, "UNKLINE");
    return 0;
  }

  if (parse_aline("UNKLINE", source_p, parc, parv, 0, &user,
                  &host, NULL, &target_server, NULL) < 0)
    return 0;

  if (target_server != NULL)
  {
     sendto_match_servs(source_p, target_server, CAP_UNKLN,
                        "UNKLINE %s %s %s",
                        target_server, user, host);

    /* Allow ON to apply local unkline as well if it matches */
    if (match(target_server, me.name))
      return 0;
  }
  else
    cluster_a_line(source_p, "UNKLINE", CAP_UNKLN, SHARED_UNKLINE,
                   "%s %s", user, host);

  if (remove_kline_match(host, user))
  {
    sendto_one(source_p, ":%s NOTICE %s :K-Line for [%s@%s] is removed",
               me.name, source_p->name, user, host);
    sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE,
                         "%s has removed the K-Line for: [%s@%s]",
                         get_oper_name(source_p), user, host);
    ilog(LOG_TYPE_KLINE, "%s removed K-Line for [%s@%s]",
         get_oper_name(source_p), user, host);
  }
  else
    sendto_one(source_p, ":%s NOTICE %s :No K-Line for [%s@%s] found", 
	       me.name, source_p->name, user, host);
  return 0;
}

/* me_unkline()
 *
 * inputs	- server
 *		- client
 *		- parc
 *		- parv
 * outputs	- none
 * side effects	- if server is authorized, kline is removed
 *                does not propagate message
 */
static int
me_unkline(struct Client *client_p, struct Client *source_p,
           int parc, char *parv[])
{
  const char *kuser, *khost;

  if (parc != 4)
    return 0;

  kuser = parv[2];
  khost = parv[3];

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

  if (HasFlag(source_p, FLAGS_SERVICE) ||
      find_matching_name_conf(CONF_ULINE, source_p->servptr->name,
                              source_p->username, source_p->host,
                              SHARED_UNKLINE))
  {
    if (remove_kline_match(khost, kuser))
    {
      sendto_one(source_p, ":%s NOTICE %s :K-Line for [%s@%s] is removed",
                 me.name, source_p->name, kuser, khost);
      sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE,
                           "%s has removed the K-Line for: [%s@%s]",
                           get_oper_name(source_p), kuser, khost);
      ilog(LOG_TYPE_KLINE, "%s removed K-Line for [%s@%s]",
           get_oper_name(source_p), kuser, khost);
    }
    else
      sendto_one(source_p, ":%s NOTICE %s :No K-Line for [%s@%s] found",
                 me.name, source_p->name, kuser, khost);
  }

  return 0;
}

/* ms_unkline - propagates and handles a remote unkline message */
static int
ms_unkline(struct Client *client_p, struct Client *source_p,
           int parc, char *parv[])
{
  if (parc != 4)
    return 0;

  sendto_match_servs(source_p, parv[1], CAP_UNKLN,
                     "UNKLINE %s %s %s",
                     parv[1], parv[2], parv[3]);

  return me_unkline(client_p, source_p, parc, parv);
}

static struct Message kline_msgtab =
{
  "KLINE", 0, 0, 2, MAXPARA, MFLG_SLOW, 0,
  { m_unregistered, m_not_oper, ms_kline, me_kline, mo_kline, m_ignore }
};

static struct Message unkline_msgtab =
{
  "UNKLINE", 0, 0, 2, MAXPARA, MFLG_SLOW, 0,
  { m_unregistered, m_not_oper, ms_unkline, me_unkline, mo_unkline, m_ignore }
};

static void
module_init(void)
{
  mod_add_cmd(&kline_msgtab);
  mod_add_cmd(&unkline_msgtab);
  add_capability("KLN", CAP_KLN, 1);
  add_capability("UNKLN", CAP_UNKLN, 1);
}

static void
module_exit(void)
{
  mod_del_cmd(&kline_msgtab);
  mod_del_cmd(&unkline_msgtab);
  delete_capability("UNKLN");
  delete_capability("KLN");
}

struct module module_entry =
{
  .node    = { NULL, NULL, NULL },
  .name    = NULL,
  .version = "$Revision$",
  .handle  = NULL,
  .modinit = module_init,
  .modexit = module_exit,
  .flags   = 0
};