/**
 * hybrid.C: This file contains protocol support for hybrid-based ircd.
 *
 * Copyright © 2007 Pippijn van Steenhoven / The Ermyth Team
 * Rights to this code are as documented in COPYING.
 *
 *
 * Portions of this file were derived from sources bearing the following license:
 * Copyright © 2005-2006 Atheme Development Group
 * Rights to this code are documented in doc/pod/license.pod.
 *
 * $Id: hybrid.C,v 1.7 2007/09/16 18:54:44 pippijn Exp $
 */

#include "atheme.h"
#include "servers.h"
#include <account/myuser.h>
#include "uplink.h"
#include "pmodule.h"
#include "protocol/hybrid.h"

static char const rcsid[] = "$Id: hybrid.C,v 1.7 2007/09/16 18:54:44 pippijn Exp $";

/* *INDENT-OFF* */

namespace protocol
{
  static ircd_t Hybrid = {
    "Hybrid 7.1.2+",              /* IRCd name */
    "$$",                         /* TLD Prefix, used by Global. */
    true,                         /* Whether or not we use IRCNet/TS6 UID */
    false,                        /* Whether or not we use RCOMMAND */
    false,                        /* Whether or not we support channel owners. */
    false,                        /* Whether or not we support channel protection. */
    false,                        /* Whether or not we support halfops. */
    false,                        /* Whether or not we use P10 */
    false,                        /* Whether or not we use vHosts. */
    0,                            /* Oper-only cmodes */
    0,                            /* Integer flag for owner channel flag. */
    0,                            /* Integer flag for protect channel flag. */
    0,                            /* Integer flag for halfops. */
    "+",                          /* Mode we set for owner. */
    "+",                          /* Mode we set for protect. */
    "+",                          /* Mode we set for halfops. */
    PROTOCOL_RATBOX,              /* Protocol type */
    0,                            /* Permanent cmodes */
    "beI",                        /* Ban-like cmodes */
    'e',                          /* Except mchar */
    'I',                          /* Invex mchar */
    IRCD_CIDR_BANS                /* Flags */
  };
  
  struct hybrid_handler : handler
  {
    hybrid_handler ();
    virtual ~hybrid_handler ();
  
    virtual unsigned int server_login (void);
    virtual void introduce_nick (user_t *u);
    virtual void invite_sts (user_t *source, user_t *target, channel_t *channel);
    virtual void quit_sts (user_t *u, char const * const reason);
    virtual void wallops_sts (char const * const text);
    virtual void join_sts (channel_t *c, user_t *u, bool isnew, char const * const modes);
    virtual void chan_lowerts (channel_t *c, user_t *u);
    virtual void kick (char const * const from, char const * const channel, char const * const to, char const * const reason);
    virtual void privmsg (char const * const from, char const * const target, char const * const fmt, ...);
    virtual void notice_user_sts (user_t *from, user_t *target, char const * const text);
    virtual void notice_global_sts (user_t *from, char const * const mask, char const * const text);
    virtual void notice_channel_sts (user_t *from, channel_t *target, char const * const text);
    virtual void wallchops (user_t *sender, channel_t *channel, char const * const message);
    virtual void numeric_sts (char const * const from, int numeric, char const * const target, char const * const fmt, ...);
    virtual void skill (char const * const from, char const * const nick, char const * const fmt, ...);
    virtual void part_sts (channel_t *c, user_t *u);
    virtual void kline_sts (char const * const server, char const * const user, char const * const host, long duration, char const * const reason);
    virtual void unkline_sts (char const * const server, char const * const user, char const * const host);
    virtual void topic_sts (channel_t *c, char const * const setter, time_t ts, time_t prevts, char const * const topic);
    virtual void mode_sts (char const * const sender, channel_t *target, char const * const modes);
    virtual void ping_sts (void);
    virtual void ircd_on_login (char const * const origin, char const * const user, char const * const wantedhost);
    virtual bool ircd_on_logout (char const * const origin, char const * const user, char const * const wantedhost);
    virtual void jupe (char const * const server, char const * const reason);
    virtual void sethost_sts (char const * const source, char const * const target, char const * const host);
    virtual void fnc_sts (user_t *source, user_t *u, char const * const newnick, int type);
    virtual void holdnick_sts (user_t *source, int duration, char const * const nick, myuser_t *account);
  };
  
  static cmode_t hybrid_mode_list[] = {
    { 'i', CMODE_INVITE },
    { 'm', CMODE_MOD    },
    { 'n', CMODE_NOEXT  },
    { 'p', CMODE_PRIV   },
    { 's', CMODE_SEC    },
    { 't', CMODE_TOPIC  },
    { '\0', 0 }
  };
  
  static extmode_t hybrid_ignore_mode_list[] = {
    { '\0', 0 }
  };
  
  static cmode_t hybrid_status_mode_list[] = {
    { 'o', CMODE_OP    },
    { 'v', CMODE_VOICE },
    { '\0', 0 }
  };
  
  static cmode_t hybrid_prefix_mode_list[] = {
    { '@', CMODE_OP    },
    { '+', CMODE_VOICE },
    { '\0', 0 }
  };
  
  static bool use_rserv_support = false;
  static bool use_tb = false;
  static bool use_rsfnc = false;
  
  static char ts6sid[3 + 1] = "";
  
  /* *INDENT-ON* */
  
  /* login to our uplink */
  unsigned int
  hybrid_handler::server_login (void)
  {
    int ret = 1;
  
    if (!me.numeric)
      {
        ircd->uses_uid = false;
        ret = sts ("PASS %s :TS", curr_uplink->pass);
      }
    else if (strlen (me.numeric) == 3 && isdigit (*me.numeric))
      {
        ircd->uses_uid = true;
        ret = sts ("PASS %s TS 6 :%s", curr_uplink->pass, me.numeric);
      }
    else
      {
        slog (LG_ERROR, "Invalid numeric (SID) %s", me.numeric);
      }
    if (ret == 1)
      return 1;
  
    me.bursting = true;
  
    sts ("CAPAB :QS EX IE KLN UNKLN ENCAP TB SERVICES");
    sts ("SERVER %s 1 :%s", me.name, me.desc);
    sts ("SVINFO %d 3 0 :%ld", ircd->uses_uid ? 6 : 5, NOW);
  
    return 0;
  }
  
  /* introduce a client */
  void
  hybrid_handler::introduce_nick (user_t *u)
  {
    if (ircd->uses_uid)
      sts (":%s UID %s 1 %ld +%s%s%s %s %s 0 %s :%s", me.numeric, u->nick, u->ts, "io", chansvs.fantasy ? "" : "D", use_rserv_support ? "S" : "", u->user, u->host, u->uid, u->gecos);
    else
      sts ("NICK %s 1 %ld +%s%s%s %s %s %s :%s", u->nick, u->ts, "io", chansvs.fantasy ? "" : "D", use_rserv_support ? "S" : "", u->user, u->host, me.name, u->gecos);
  }
  
  /* invite a user to a channel */
  void
  hybrid_handler::invite_sts (user_t *sender, user_t *target, channel_t *channel)
  {
    /* some older TSora ircds require the sender to be
     * on the channel, but hyb7/ratbox don't
     * let's just assume it's not necessary -- jilles */
    sts (":%s INVITE %s %s", CLIENT_NAME (sender), CLIENT_NAME (target), channel->name);
  }
  
  void
  hybrid_handler::quit_sts (user_t *u, char const * const reason)
  {
    if (!me.connected)
      return;
  
    sts (":%s QUIT :%s", CLIENT_NAME (u), reason);
  }
  
  /* WALLOPS wrapper */
  void
  hybrid_handler::wallops_sts (char const * const text)
  {
    sts (":%s WALLOPS :%s", ME, text);
  }
  
  /* join a channel */
  void
  hybrid_handler::join_sts (channel_t *c, user_t *u, bool isnew, char const * const modes)
  {
    if (isnew)
      sts (":%s SJOIN %ld %s %s :@%s", ME, c->ts, c->name, modes, CLIENT_NAME (u));
    else
      sts (":%s SJOIN %ld %s + :@%s", ME, c->ts, c->name, CLIENT_NAME (u));
  }
  
  void
  hybrid_handler::chan_lowerts (channel_t *c, user_t *u)
  {
    slog (LG_DEBUG, "hybrid_chan_lowerts(): lowering TS for %s to %ld", c->name, (long) c->ts);
    sts (":%s SJOIN %ld %s %s :@%s", ME, c->ts, c->name, channel_modes (c, true), CLIENT_NAME (u));
    if (ircd->uses_uid)
      chanban_clear (c);
  }
  
  /* kicks a user from a channel */
  void
  hybrid_handler::kick (char const * const from, char const * const channel, char const * const to, char const * const reason)
  {
    channel_t *chan = channel_find (channel);
    user_t *user = user_find (to);
    user_t *from_p = user_find (from);
  
    if (!chan || !user)
      return;
  
    if (chan->ts != 0 || chanuser_find (chan, from_p))
      sts (":%s KICK %s %s :%s", CLIENT_NAME (from_p), channel, CLIENT_NAME (user), reason);
    else
      sts (":%s KICK %s %s :%s", ME, channel, CLIENT_NAME (user), reason);
  
    chanuser_delete (chan, user);
  }
  
  /* PRIVMSG wrapper */
  void
  hybrid_handler::privmsg (char const * const from, char const * const target, char const * const fmt, ...)
  {
    va_list ap;
    char buf[BUFSIZE];
    user_t *u = user_find (from);
    user_t *t = user_find (target);
  
    if (!u)
      return;
  
    va_start (ap, fmt);
    vsnprintf (buf, BUFSIZE, fmt, ap);
    va_end (ap);
  
    /* If this is to a channel, it's the snoop channel so chanserv
     * is on it -- jilles
     *
     * Well, now it's operserv, but yes it's safe to assume that
     * the source would be able to send to whatever target it is 
     * sending to. --nenolod
     */
    sts (":%s PRIVMSG %s :%s", CLIENT_NAME (u), t ? CLIENT_NAME (t) : target, buf);
  }
  
  /* NOTICE wrapper */
  void
  hybrid_handler::notice_user_sts (user_t *from, user_t *target, char const * const text)
  {
    sts (":%s NOTICE %s :%s", from ? CLIENT_NAME (from) : ME, CLIENT_NAME (target), text);
  }
  
  void
  hybrid_handler::notice_global_sts (user_t *from, char const * const mask, char const * const text)
  {
    node_t *n;
    tld_t *tld;
  
    if (!strcmp (mask, "*"))
      {
        LIST_FOREACH (n, tldlist.head)
        {
          tld = static_cast<tld_t *> (n->data);
          sts (":%s NOTICE %s*%s :%s", from ? CLIENT_NAME (from) : ME, ircd->tldprefix, tld->name, text);
        }
      }
    else
      sts (":%s NOTICE %s%s :%s", from ? CLIENT_NAME (from) : ME, ircd->tldprefix, mask, text);
  }
  
  void
  hybrid_handler::notice_channel_sts (user_t *from, channel_t *target, char const * const text)
  {
    if (from == NULL || chanuser_find (target, from))
      sts (":%s NOTICE %s :%s", from ? CLIENT_NAME (from) : ME, target->name, text);
    else
      /* not on channel, let's send it from the server
       * hyb6 won't accept this, oh well, they'll have to
       * enable join_chans -- jilles */
      sts (":%s NOTICE %s :[%s:%s]: %s", ME, target->name, from->nick, target->name, text);
  }
  
  void
  hybrid_handler::wallchops (user_t *sender, channel_t *channel, char const * const message)
  {
    if (chanuser_find (channel, sender))
      sts (":%s NOTICE @%s :%s", CLIENT_NAME (sender), channel->name, message);
    else                                /* do not join for this, everyone would see -- jilles */
      handler::wallchops (sender, channel, message);
  }
  
  /* numeric wrapper */
  void
  hybrid_handler::numeric_sts (char const * const from, int numeric, char const * const target, char const * const fmt, ...)
  {
    va_list ap;
    char buf[BUFSIZE];
    user_t *t = user_find (target);
  
    va_start (ap, fmt);
    vsnprintf (buf, BUFSIZE, fmt, ap);
    va_end (ap);
  
    sts (":%s %d %s %s", ME, numeric, CLIENT_NAME (t), buf);
  }
  
  /* KILL wrapper */
  void
  hybrid_handler::skill (char const * const from, char const * const nick, char const * const fmt, ...)
  {
    va_list ap;
    char buf[BUFSIZE];
    user_t *killer = user_find (from);
    user_t *victim = user_find (nick);
  
    va_start (ap, fmt);
    vsnprintf (buf, BUFSIZE, fmt, ap);
    va_end (ap);
  
    sts (":%s KILL %s :%s!%s!%s (%s)", killer ? CLIENT_NAME (killer) : ME, victim ? CLIENT_NAME (victim) : nick, from, from, from, buf);
  }
  
  /* PART wrapper */
  void
  hybrid_handler::part_sts (channel_t *c, user_t *u)
  {
    sts (":%s PART %s", CLIENT_NAME (u), c->name);
  }
  
  /* server-to-server KLINE wrapper */
  void
  hybrid_handler::kline_sts (char const * const server, char const * const user, char const * const host, long duration, char const * const reason)
  {
    if (!me.connected)
      return;
  
    sts (":%s KLINE %s %ld %s %s :%s", CLIENT_NAME (opersvs.me->me), server, duration, user, host, reason);
  }
  
  /* server-to-server UNKLINE wrapper */
  void
  hybrid_handler::unkline_sts (char const * const server, char const * const user, char const * const host)
  {
    if (!me.connected)
      return;
  
    sts (":%s UNKLINE %s %s %s", CLIENT_NAME (opersvs.me->me), server, user, host);
  }
  
  /* topic wrapper */
  void
  hybrid_handler::topic_sts (channel_t *c, char const * const setter, time_t ts, time_t prevts, char const * const topic)
  {
    int joined = 0;
  
    if (!me.connected || !c)
      return;
  
    /* If possible, try to use TB
     * Note that because TOPIC does not contain topicTS, it may be
     * off a few seconds on other servers, hence the 60 seconds here.
     * -- jilles */
    if (use_tb && *topic != '\0')
      {
        /* Restoring old topic */
        if (ts < prevts || prevts == 0)
          {
            if (prevts != 0 && ts + 60 > prevts)
              ts = prevts - 60;
            sts (":%s TB %s %ld %s :%s", ME, c->name, ts, setter, topic);
            c->topicts = ts;
            return;
          }
        /* Tweaking a topic */
        else if (ts == prevts)
          {
            ts -= 60;
            sts (":%s TB %s %ld %s :%s", ME, c->name, ts, setter, topic);
            c->topicts = ts;
            return;
          }
      }
    /* We have to be on channel to change topic.
     * We cannot nicely change topic from the server:
     * :server.name TOPIC doesn't propagate and TB requires
     * us to specify an older topicts.
     * -- jilles
     */
    if (!chanuser_find (c, chansvs.me->me))
      {
        sts (":%s SJOIN %ld %s + :@%s", ME, c->ts, c->name, CLIENT_NAME (chansvs.me->me));
        joined = 1;
      }
    sts (":%s TOPIC %s :%s", CLIENT_NAME (chansvs.me->me), c->name, topic);
    if (joined)
      sts (":%s PART %s :Topic set", CLIENT_NAME (chansvs.me->me), c->name);
    c->topicts = NOW;
  }
  
  /* mode wrapper */
  void
  hybrid_handler::mode_sts (char const * const sender, channel_t *target, char const * const modes)
  {
    user_t *u = user_find (sender);
  
    if (!me.connected || !u)
      return;
  
    if (ircd->uses_uid)
      sts (":%s TMODE %ld %s %s", CLIENT_NAME (u), target->ts, target->name, modes);
    else
      sts (":%s MODE %s %s", CLIENT_NAME (u), target->name, modes);
  }
  
  /* ping wrapper */
  void
  hybrid_handler::ping_sts (void)
  {
    if (!me.connected)
      return;
  
    sts ("PING :%s", me.name);
  }
  
  /* protocol-specific stuff to do on login */
  void
  hybrid_handler::ircd_on_login (char const * const origin, char const * const user, char const * const wantedhost)
  {
    user_t *u = user_find (origin);
  
    if (!me.connected || !use_rserv_support || !u)
      return;
  
    sts (":%s ENCAP * SU %s %s", ME, CLIENT_NAME (u), user);
  }
  
  /* protocol-specific stuff to do on login */
  bool
  hybrid_handler::ircd_on_logout (char const * const origin, char const * const user, char const * const wantedhost)
  {
    user_t *u = user_find (origin);
  
    if (!me.connected || !use_rserv_support || !u)
      return false;
  
    sts (":%s ENCAP * SU %s", ME, CLIENT_NAME (u));
    return false;
  }
  
  void
  hybrid_handler::jupe (char const * const server, char const * const reason)
  {
    if (!me.connected)
      return;
  
    server_delete (server);
    sts (":%s SQUIT %s :%s", CLIENT_NAME (opersvs.me->me), server, reason);
    sts (":%s SERVER %s 2 :(H) %s", me.name, server, reason);
  }
  
  void
  hybrid_handler::fnc_sts (user_t *source, user_t *u, char const * const newnick, int type)
  {
    if (use_rsfnc)
      /* XXX assumes whole net has it -- jilles */
      sts (":%s ENCAP %s RSFNC %s %s %lu %lu", ME, u->server->name, CLIENT_NAME (u), newnick, (unsigned long) (NOW - 60), (unsigned long) u->ts);
    else
      handler::fnc_sts (source, u, newnick, type);
  }
  
  void
  hybrid_handler::sethost_sts (char const * const source, char const * const target, char const * const host)
  {
    user_t *tu = user_find (target);
  
    if (!tu)
      return;
  
    notice (source, target, "Setting your host to \2%s\2.", host);
    sts (":%s CHGHOST %s :%s", ME, tu->nick, host);
  }
  
  void
  hybrid_handler::holdnick_sts (user_t *source, int duration, char const * const nick, myuser_t *account)
  {
    if (duration == 0)
      return;                        /* can't do this safely */
    sts (":%s ENCAP * RESV %d %s 0 :Reserved by %s for nickname owner (%s)", CLIENT_NAME (source), duration > 300 ? 300 : duration, nick, source->nick, account != NULL ? account->name : nick);
  }
  
  static void
  m_topic (sourceinfo_t *si, int parc, char *parv[])
  {
    channel_t *c = channel_find (parv[0]);
  
    if (c == NULL)
      return;
  
    handle_topic_from (si, c, si->su->nick, NOW, parv[1]);
  }
  
  static void
  m_tb (sourceinfo_t *si, int parc, char *parv[])
  {
    channel_t *c = channel_find (parv[0]);
    time_t ts = atol (parv[1]);
  
    if (c == NULL)
      return;
  
    if (c->topic != NULL && c->topicts <= ts)
      {
        slog (LG_DEBUG, "m_tb(): ignoring newer topic on %s", c->name);
        return;
      }
  
    handle_topic_from (si, c, parc > 3 ? parv[2] : si->s->name, ts, parv[parc - 1]);
  }
  
  static void
  m_ping (sourceinfo_t *si, int parc, char *parv[])
  {
    /* reply to PING's */
    sts (":%s PONG %s %s", ME, me.name, parv[0]);
  }
  
  static void
  m_pong (sourceinfo_t *si, int parc, char *parv[])
  {
    server_t *s;
  
    /* someone replied to our PING */
    if (!parv[0])
      return;
    s = server_find (parv[0]);
    if (s == NULL)
      return;
    handle_eob (s);
  
    if (irccasecmp (me.actual, parv[0]))
      return;
  
    me.uplinkpong = NOW;
  
    /* -> :test.projectxero.net PONG test.projectxero.net :shrike.malkier.net */
    if (me.bursting)
      {
  #ifdef HAVE_GETTIMEOFDAY
        e_time (burstime, &burstime);
  
        slog (LG_INFO, "m_pong(): finished synching with uplink (%d %s)", (tv2ms (&burstime) > 1000) ? (tv2ms (&burstime) / 1000) : tv2ms (&burstime), (tv2ms (&burstime) > 1000) ? "s" : "ms");
  
        wallops ("Finished synching to network in %d %s.", (tv2ms (&burstime) > 1000) ? (tv2ms (&burstime) / 1000) : tv2ms (&burstime), (tv2ms (&burstime) > 1000) ? "s" : "ms");
  #else
        slog (LG_INFO, "m_pong(): finished synching with uplink");
        wallops ("Finished synching to network.");
  #endif
  
        me.bursting = false;
      }
  }
  
  static void
  m_privmsg (sourceinfo_t *si, int parc, char *parv[])
  {
    if (parc != 2)
      return;
  
    handle_message (si, parv[0], false, parv[1]);
  }
  
  static void
  m_notice (sourceinfo_t *si, int parc, char *parv[])
  {
    if (parc != 2)
      return;
  
    handle_message (si, parv[0], true, parv[1]);
  }
  
  static void
  m_sjoin (sourceinfo_t *si, int parc, char *parv[])
  {
    /* -> :proteus.malkier.net SJOIN 1073516550 #shrike +tn :@sycobuny @+rakaur */
  
    channel_t *c;
    bool keep_new_modes = true;
    unsigned int userc;
    char *userv[256];
    unsigned int i;
    time_t ts;
    char *p;
  
    /* :origin SJOIN ts chan modestr [key or limits] :users */
    c = channel_find (parv[1]);
    ts = atol (parv[0]);
  
    if (!c)
      {
        slog (LG_DEBUG, "m_sjoin(): new channel: %s", parv[1]);
        c = channel_add (parv[1], ts, si->s);
      }
  
    if (ts == 0 || c->ts == 0)
      {
        if (c->ts != 0)
          slog (LG_INFO, "m_sjoin(): server %s changing TS on %s from %ld to 0", si->s->name, c->name, (long) c->ts);
        c->ts = 0;
        c->callback.tschange (c);
      }
    else if (ts < c->ts)
      {
        chanuser_t *cu;
        node_t *n;
  
        /* the TS changed.  a TS change requires the following things
         * to be done to the channel:  reset all modes to nothing, remove
         * all status modes on known users on the channel (including ours),
         * and set the new TS.
         *
         * if the source does TS6, also remove all bans
         * note that JOIN does not do this
         */
  
        clear_simple_modes (c);
        if (si->s->sid != NULL)
          chanban_clear (c);
  
        LIST_FOREACH (n, c->members.head)
        {
          cu = (chanuser_t *) n->data;
          if (cu->user->server == me.me)
            {
              /* it's a service, reop */
              sts (":%s PART %s :Reop", CLIENT_NAME (cu->user), c->name);
              sts (":%s SJOIN %ld %s + :@%s", ME, ts, c->name, CLIENT_NAME (cu->user));
              cu->modes = CMODE_OP;
            }
          else
            cu->modes = 0;
        }
  
        slog (LG_DEBUG, "m_sjoin(): TS changed for %s (%ld -> %ld)", c->name, c->ts, ts);
  
        c->ts = ts;
        c->callback.tschange (c);
      }
    else if (ts > c->ts)
      keep_new_modes = false;
  
    if (keep_new_modes)
      channel_mode (NULL, c, parc - 3, parv + 2);
  
    userc = sjtoken (parv[parc - 1], ' ', userv);
  
    if (keep_new_modes)
      for (i = 0; i < userc; i++)
        chanuser_add (c, userv[i]);
    else
      for (i = 0; i < userc; i++)
        {
          p = userv[i];
          while (*p == '@' || *p == '%' || *p == '+')
            p++;
          /* XXX for TS5 we should mark them deopped
           * if they were opped and drop modes from them
           * -- jilles */
          chanuser_add (c, p);
        }
  
    if (c->nummembers == 0 && !(c->modes & ircd->perm_mode))
      channel_delete (c);
  }
  
  static void
  m_join (sourceinfo_t *si, int parc, char *parv[])
  {
    /* -> :1JJAAAAAB JOIN 1127474195 #test +tn */
    bool keep_new_modes = true;
    node_t *n, *tn;
    channel_t *c;
    chanuser_t *cu;
    time_t ts;
  
    /* JOIN 0 is really a part from all channels */
    /* be sure to allow joins to TS 0 channels -- jilles */
    if (parv[0][0] == '0' && parc <= 2)
      {
        LIST_FOREACH_SAFE (n, tn, si->su->channels.head)
        {
          cu = (chanuser_t *) n->data;
          chanuser_delete (cu->chan, si->su);
        }
        return;
      }
  
    /* :user JOIN ts chan modestr [key or limits] */
    c = channel_find (parv[1]);
    ts = atol (parv[0]);
  
    if (!c)
      {
        slog (LG_DEBUG, "m_join(): new channel: %s", parv[1]);
        c = channel_add (parv[1], ts, si->su->server);
      }
  
    if (ts == 0 || c->ts == 0)
      {
        if (c->ts != 0)
          slog (LG_INFO, "m_join(): server %s changing TS on %s from %ld to 0", si->su->server->name, c->name, (long) c->ts);
        c->ts = 0;
        c->callback.tschange (c);
      }
    else if (ts < c->ts)
      {
        /* the TS changed.  a TS change requires the following things
         * to be done to the channel:  reset all modes to nothing, remove
         * all status modes on known users on the channel (including ours),
         * and set the new TS.
         */
        clear_simple_modes (c);
  
        LIST_FOREACH (n, c->members.head)
        {
          cu = (chanuser_t *) n->data;
          if (cu->user->server == me.me)
            {
              /* it's a service, reop */
              sts (":%s PART %s :Reop", CLIENT_NAME (cu->user), c->name);
              sts (":%s SJOIN %ld %s + :@%s", ME, ts, c->name, CLIENT_NAME (cu->user));
              cu->modes = CMODE_OP;
            }
          else
            cu->modes = 0;
        }
        slog (LG_DEBUG, "m_join(): TS changed for %s (%ld -> %ld)", c->name, c->ts, ts);
        c->ts = ts;
        c->callback.tschange (c);
      }
    else if (ts > c->ts)
      keep_new_modes = false;
  
    if (keep_new_modes)
      channel_mode (NULL, c, parc - 2, parv + 2);
  
    chanuser_add (c, CLIENT_NAME (si->su));
  }
  
  static void
  m_bmask (sourceinfo_t *si, int parc, char *parv[])
  {
    unsigned int ac, i;
    char *av[256];
    channel_t *c = channel_find (parv[1]);
    int type;
  
    /* :1JJ BMASK 1127474361 #services b :*!*@*evil* *!*eviluser1@* */
    if (!c)
      {
        slog (LG_DEBUG, "m_bmask(): got bmask for unknown channel");
        return;
      }
  
    if (atol (parv[0]) > c->ts)
      return;
  
    type = *parv[2];
    if (!strchr (ircd->ban_like_modes, type))
      {
        slog (LG_DEBUG, "m_bmask(): got unknown type '%c'", type);
        return;
      }
  
    ac = sjtoken (parv[parc - 1], ' ', av);
  
    for (i = 0; i < ac; i++)
      chanban_add (c, av[i], type);
  }
  
  static void
  m_part (sourceinfo_t *si, int parc, char *parv[])
  {
    int chanc;
    char *chanv[256];
    int i;
  
    chanc = sjtoken (parv[0], ',', chanv);
    for (i = 0; i < chanc; i++)
      {
        slog (LG_DEBUG, "m_part(): user left channel: %s -> %s", si->su->nick, chanv[i]);
  
        chanuser_delete (channel_find (chanv[i]), si->su);
      }
  }
  
  static void
  m_nick (sourceinfo_t *si, int parc, char *parv[])
  {
    server_t *s;
    user_t *u;
  
    /* got the right number of args for an introduction? */
    if (parc == 8)
      {
        s = server_find (parv[6]);
        if (!s)
          {
            slog (LG_DEBUG, "m_nick(): new user on nonexistant server: %s", parv[6]);
            return;
          }
  
        slog (LG_DEBUG, "m_nick(): new user on `%s': %s", s->name, parv[0]);
  
        u = user_add (parv[0], parv[4], parv[5], NULL, NULL, NULL, parv[7], s, atoi (parv[2]));
  
        user_mode (u, parv[3]);
  
        /* If server is not yet EOB we will do this later.
         * This avoids useless "please identify" -- jilles */
        if (s->flags & SF_EOB)
          handle_nickchange (user_find (parv[0]));
      }
  
    /* if it's only 2 then it's a nickname change */
    else if (parc == 2)
      {
        if (!si->su)
          {
            slog (LG_DEBUG, "m_nick(): server trying to change nick: %s", si->s != NULL ? si->s->name : "<none>");
            return;
          }
  
        slog (LG_DEBUG, "m_nick(): nickname change from `%s': %s", si->su->nick, parv[0]);
  
        user_changenick (si->su, parv[0], atoi (parv[1]));
  
        /* It could happen that our PING arrived late and the
         * server didn't acknowledge EOB yet even though it is
         * EOB; don't send double notices in that case -- jilles */
        if (si->su->server->flags & SF_EOB)
          handle_nickchange (si->su);
      }
    else
      {
        int i;
        slog (LG_DEBUG, "m_nick(): got NICK with wrong number of params");
  
        for (i = 0; i < parc; i++)
          slog (LG_DEBUG, "m_nick():   parv[%d] = %s", i, parv[i]);
      }
  }
  
  static void
  m_uid (sourceinfo_t *si, int parc, char *parv[])
  {
    server_t *s;
    user_t *u;
  
    /* got the right number of args for an introduction? */
    if (parc == 9)
      {
        s = si->s;
        slog (LG_DEBUG, "m_uid(): new user on `%s': %s", s->name, parv[0]);
  
  
        u = user_add (parv[0], parv[4], parv[5], NULL, parv[6], parv[7], parv[8], s, atoi (parv[2]));
  
        user_mode (u, parv[3]);
  
        /* If server is not yet EOB we will do this later.
         * This avoids useless "please identify" -- jilles
         */
        if (s->flags & SF_EOB)
          handle_nickchange (user_find (parv[0]));
      }
    else
      {
        int i;
        slog (LG_DEBUG, "m_uid(): got UID with wrong number of params");
  
        for (i = 0; i < parc; i++)
          slog (LG_DEBUG, "m_uid():   parv[%d] = %s", i, parv[i]);
      }
  }
  
  static void
  m_quit (sourceinfo_t *si, int parc, char *parv[])
  {
    slog (LG_DEBUG, "m_quit(): user leaving: %s", si->su->nick);
  
    /* user_delete() takes care of removing channels and so forth */
    user_delete (si->su);
  }
  
  static void
  m_mode (sourceinfo_t *si, int parc, char *parv[])
  {
    if (*parv[0] == '#')
      channel_mode (NULL, channel_find (parv[0]), parc - 1, &parv[1]);
    else
      user_mode (user_find (parv[0]), parv[1]);
  }
  
  static void
  m_tmode (sourceinfo_t *si, int parc, char *parv[])
  {
    channel_t *c;
  
    /* -> :1JJAAAAAB TMODE 1127511579 #new +o 2JJAAAAAB */
    c = channel_find (parv[1]);
    if (c == NULL)
      {
        slog (LG_DEBUG, "m_tmode(): nonexistent channel %s", parv[1]);
        return;
      }
  
    if (atol (parv[0]) > c->ts)
      return;
  
    channel_mode (NULL, c, parc - 2, &parv[2]);
  }
  
  static void
  m_kick (sourceinfo_t *si, int parc, char *parv[])
  {
    user_t *u = user_find (parv[1]);
    channel_t *c = channel_find (parv[0]);
  
    /* -> :rakaur KICK #shrike rintaun :test */
    slog (LG_DEBUG, "m_kick(): user was kicked: %s -> %s", parv[1], parv[0]);
  
    if (!u)
      {
        slog (LG_DEBUG, "m_kick(): got kick for nonexistant user %s", parv[1]);
        return;
      }
  
    if (!c)
      {
        slog (LG_DEBUG, "m_kick(): got kick in nonexistant channel: %s", parv[0]);
        return;
      }
  
    if (!chanuser_find (c, u))
      {
        slog (LG_DEBUG, "m_kick(): got kick for %s not in %s", u->nick, c->name);
        return;
      }
  
    chanuser_delete (c, u);
  
    /* if they kicked us, let's rejoin */
    if (is_internal_client (u))
      {
        slog (LG_DEBUG, "m_kick(): %s got kicked from %s; rejoining", u->nick, parv[0]);
        join (parv[0], u->nick);
      }
  }
  
  static void
  m_kill (sourceinfo_t *si, int parc, char *parv[])
  {
    handle_kill (si, parv[0], parc > 1 ? parv[1] : "<No reason given>");
  }
  
  static void
  m_squit (sourceinfo_t *si, int parc, char *parv[])
  {
    slog (LG_DEBUG, "m_squit(): server leaving: %s from %s", parv[0], parv[1]);
    server_delete (parv[0]);
  }
  
  static void
  m_server (sourceinfo_t *si, int parc, char *parv[])
  {
    server_t *s;
  
    slog (LG_DEBUG, "m_server(): new server: %s", parv[0]);
    s = handle_server (si, parv[0], si->s || !ircd->uses_uid ? NULL : ts6sid, atoi (parv[1]), parv[2]);
  
    if (s != NULL && s->uplink != me.me)
      {
        /* elicit PONG for EOB detection; pinging uplink is
         * already done elsewhere -- jilles
         */
        sts (":%s PING %s %s", ME, me.name, s->name);
      }
  }
  
  static void
  m_sid (sourceinfo_t *si, int parc, char *parv[])
  {
    /* -> :1JJ SID file. 2 00F :telnet server */
    server_t *s;
  
    slog (LG_DEBUG, "m_sid(): new server: %s", parv[0]);
    s = handle_server (si, parv[0], parv[2], atoi (parv[1]), parv[3]);
  
    if (s != NULL && s->uplink != me.me)
      {
        /* elicit PONG for EOB detection; pinging uplink is
         * already done elsewhere -- jilles
         */
        sts (":%s PING %s %s", ME, me.name, s->sid);
      }
  }
  
  static void
  m_stats (sourceinfo_t *si, int parc, char *parv[])
  {
    handle_stats (si->su, parv[0][0]);
  }
  
  static void
  m_admin (sourceinfo_t *si, int parc, char *parv[])
  {
    handle_admin (si->su);
  }
  
  static void
  m_version (sourceinfo_t *si, int parc, char *parv[])
  {
    handle_version (si->su);
  }
  
  static void
  m_info (sourceinfo_t *si, int parc, char *parv[])
  {
    handle_info (si->su);
  }
  
  static void
  m_whois (sourceinfo_t *si, int parc, char *parv[])
  {
    handle_whois (si->su, parv[1]);
  }
  
  static void
  m_trace (sourceinfo_t *si, int parc, char *parv[])
  {
    handle_trace (si->su, parv[0], parc >= 2 ? parv[1] : NULL);
  }
  
  static void
  m_away (sourceinfo_t *si, int parc, char *parv[])
  {
    handle_away (si->su, parc >= 1 ? parv[0] : NULL);
  }
  
  static void
  m_pass (sourceinfo_t *si, int parc, char *parv[])
  {
    /* TS5: PASS mypassword :TS
     * TS6: PASS mypassword TS 6 :sid */
    if (strcmp (curr_uplink->pass, parv[0]))
      {
        slog (LG_INFO, "m_pass(): password mismatch from uplink; aborting");
        runflags |= RF_SHUTDOWN;
      }
  
    if (ircd->uses_uid && parc > 3 && atoi (parv[2]) >= 6)
      strlcpy (ts6sid, parv[3], sizeof (ts6sid));
    else
      {
        if (ircd->uses_uid)
          {
            slog (LG_INFO, "m_pass(): uplink does not support TS6, falling back to TS5");
            ircd->uses_uid = false;
          }
        ts6sid[0] = '\0';
      }
  }
  
  static void
  m_error (sourceinfo_t *si, int parc, char *parv[])
  {
    slog (LG_INFO, "m_error(): error from server: %s", parv[0]);
  }
  
  static void
  m_encap (sourceinfo_t *si, int parc, char *parv[])
  {
    user_t *u;
  
    if (match (parv[0], me.name))
      return;
    if (!irccasecmp (parv[1], "LOGIN"))
      {
        /* :jilles ENCAP * LOGIN jilles */
        if (!use_rserv_support)
          return;
        if (parc < 3)
          return;
        u = si->su;
        if (u == NULL)
          return;
        if (u->server->flags & SF_EOB)
          {
            slog (LG_DEBUG, "m_encap(): %s sent ENCAP LOGIN for user %s outside burst", u->server->name, si->su->nick);
            return;
          }
        handle_burstlogin (u, parv[2]);
      }
  }
  
  static void
  m_capab (sourceinfo_t *si, int parc, char *parv[])
  {
    char *p;
  
    use_rserv_support = false;
    use_tb = false;
    use_rsfnc = false;
    for (p = strtok (parv[0], " "); p != NULL; p = strtok (NULL, " "))
      {
        if (!irccasecmp (p, "SERVICES"))
          {
            slog (LG_DEBUG, "m_capab(): uplink has rserv extensions, enabling support.");
            use_rserv_support = true;
          }
        if (!irccasecmp (p, "TB"))
          {
            slog (LG_DEBUG, "m_capab(): uplink does topic bursting, using if appropriate.");
            use_tb = true;
          }
        if (!irccasecmp (p, "RSFNC"))
          {
            slog (LG_DEBUG, "m_capab(): uplink does RSFNC, assuming whole net has it.");
            use_rsfnc = true;
          }
      }
  
    /* Now we know whether or not we should enable services support,
     * so burst the clients.
     *       --nenolod
     */
    services_init ();
  }
  
  static void
  m_chghost (sourceinfo_t *si, int parc, char *parv[])
  {
    user_t *u = user_find (parv[0]);
  
    if (!u)
      return;
  
    strlcpy (u->vhost, parv[1], HOSTLEN);
  }
  
  static void
  m_motd (sourceinfo_t *si, int parc, char *parv[])
  {
    handle_motd (si->su);
  }
  
  /* Server ended their burst: warn all their users if necessary -- jilles */
  static void
  server_eob (server_t *s)
  {
    node_t *n;
  
    LIST_FOREACH (n, s->userlist.head)
    {
      handle_nickchange ((user_t *) n->data);
    }
  }
  
  static pcommand_t const pcommands[] = {
    { "PING", m_ping, 1, MSRC_USER | MSRC_SERVER },
    { "PONG", m_pong, 1, MSRC_SERVER },
    { "PRIVMSG", m_privmsg, 2, MSRC_USER },
    { "NOTICE", m_notice, 2, MSRC_UNREG | MSRC_USER | MSRC_SERVER },
    { "SJOIN", m_sjoin, 4, MSRC_SERVER },
    { "PART", m_part, 1, MSRC_USER },
    { "NICK", m_nick, 2, MSRC_USER | MSRC_SERVER },
    { "QUIT", m_quit, 1, MSRC_USER },
    { "MODE", m_mode, 2, MSRC_USER | MSRC_SERVER },
    { "KICK", m_kick, 2, MSRC_USER | MSRC_SERVER },
    { "KILL", m_kill, 1, MSRC_USER | MSRC_SERVER },
    { "SQUIT", m_squit, 1, MSRC_USER | MSRC_SERVER },
    { "SERVER", m_server, 3, MSRC_UNREG | MSRC_SERVER },
    { "STATS", m_stats, 2, MSRC_USER },
    { "ADMIN", m_admin, 1, MSRC_USER },
    { "VERSION", m_version, 1, MSRC_USER },
    { "INFO", m_info, 1, MSRC_USER },
    { "WHOIS", m_whois, 2, MSRC_USER },
    { "TRACE", m_trace, 1, MSRC_USER },
    { "AWAY", m_away, 0, MSRC_USER },
    { "JOIN", m_join, 1, MSRC_USER },
    { "PASS", m_pass, 1, MSRC_UNREG },
    { "ERROR", m_error, 1, MSRC_UNREG | MSRC_SERVER },
    { "TOPIC", m_topic, 2, MSRC_USER },
    { "TB", m_tb, 3, MSRC_SERVER },
    { "ENCAP", m_encap, 2, MSRC_USER | MSRC_SERVER },
    { "CAPAB", m_capab, 1, MSRC_UNREG },
    { "UID", m_uid, 9, MSRC_SERVER },
    { "BMASK", m_bmask, 4, MSRC_SERVER },
    { "TMODE", m_tmode, 3, MSRC_USER | MSRC_SERVER },
    { "SID", m_sid, 4, MSRC_SERVER },
    { "CHGHOST", m_chghost, 2, MSRC_USER | MSRC_SERVER },
    { "MOTD", m_motd, 1, MSRC_USER },
  };
  
  hybrid_handler::hybrid_handler ()
  {
    mode_list = hybrid_mode_list;
    ignore_mode_list = hybrid_ignore_mode_list;
    status_mode_list = hybrid_status_mode_list;
    prefix_mode_list = hybrid_prefix_mode_list;
  
    ircd = &Hybrid;
  
    pcommand_add (&pcommands);
  
    server_t::callback.eob.attach (server_eob);
  }
  
  hybrid_handler::~hybrid_handler ()
  {
    server_t::callback.eob.detach (server_eob);
  
    pcommand_delete (&pcommands);
  
    ircd = NULL;
  
    prefix_mode_list = NULL;
    status_mode_list = NULL;
    ignore_mode_list = NULL;
    mode_list = NULL;
  }
} // namespace protocol

#define FACREG_TYPE protocol::hybrid_handler
#define FACREG_TYPE_NAME "hybrid"
#define FACREG_INTERFACE_TYPE protocol::handler
#include <ermyth/factory_reg.h>