/*
 * servmsg.c -- part of server.mod
 *
 * $Id: servmsg.c,v 1.91 2006-03-28 02:35:51 wcc Exp $
 */
/*
 * Copyright (C) 1997 Robey Pointer
 * Copyright (C) 1999 - 2006 Eggheads 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.
 */


static time_t last_ctcp = (time_t) 0L;
static int count_ctcp = 0;
static char altnick_char = 0;

/* We try to change to a preferred unique nick here. We always first try the
 * specified alternate nick. If that failes, we repeatedly modify the nick
 * until it gets accepted.
 *
 * sent nick:
 *     "<altnick><c>"
 *                ^--- additional count character: 1-9^-_\\[]`a-z
 *          ^--------- given, alternate nick
 *
 * The last added character is always saved in altnick_char. At the very first
 * attempt (were altnick_char is 0), we try the alternate nick without any
 * additions.
 *
 * fixed by guppy (1999/02/24) and Fabian (1999/11/26)
 */
static int gotfake433(char *from)
{
  int l = strlen(botname) - 1;

  /* First run? */
  if (altnick_char == 0) {
    char *alt = get_altbotnick();

    if (alt[0] && (rfc_casecmp(alt, botname)))
      /* Alternate nickname defined. Let's try that first. */
      strcpy(botname, alt);
    else {
      /* Fall back to appending count char. */
      altnick_char = '0';
      if ((l + 1) == nick_len) {
        botname[l] = altnick_char;
      } else {
        botname[++l] = altnick_char;
        botname[l + 1] = 0;
      }
    }
    /* No, we already tried the default stuff. Now we'll go through variations
     * of the original alternate nick.
     */
  } else {
    char *oknicks = "^-_\\[]`";
    char *p = strchr(oknicks, altnick_char);

    if (p == NULL) {
      if (altnick_char == '9')
        altnick_char = oknicks[0];
      else
        altnick_char = altnick_char + 1;
    } else {
      p++;
      if (!*p)
        altnick_char = 'a' + randint(26);
      else
        altnick_char = (*p);
    }
    botname[l] = altnick_char;
  }
  putlog(LOG_MISC, "*", IRC_BOTNICKINUSE, botname);
  dprintf(DP_MODE, "NICK %s\n", botname);
  return 0;
}

/* Check for tcl-bound msg command, return 1 if found
 *
 * msg: proc-name <nick> <user@host> <handle> <args...>
 */
static int check_tcl_msg(char *cmd, char *nick, char *uhost,
                         struct userrec *u, char *args)
{
  struct flag_record fr = { FR_GLOBAL | FR_CHAN | FR_ANYWH, 0, 0, 0, 0, 0 };
  char *hand = u ? u->handle : "*";
  int x;

  get_user_flagrec(u, &fr, NULL);
  Tcl_SetVar(interp, "_msg1", nick, 0);
  Tcl_SetVar(interp, "_msg2", uhost, 0);
  Tcl_SetVar(interp, "_msg3", hand, 0);
  Tcl_SetVar(interp, "_msg4", args, 0);
  x = check_tcl_bind(H_msg, cmd, &fr, " $_msg1 $_msg2 $_msg3 $_msg4",
                     MATCH_EXACT | BIND_HAS_BUILTINS | BIND_USE_ATTR);
  if (x == BIND_EXEC_LOG)
    putlog(LOG_CMDS, "*", "(%s!%s) !%s! %s %s", nick, uhost, hand, cmd, args);
  return ((x == BIND_MATCHED) || (x == BIND_EXECUTED) || (x == BIND_EXEC_LOG));
}

static int check_tcl_msgm(char *cmd, char *nick, char *uhost,
                           struct userrec *u, char *arg)
{
  struct flag_record fr = { FR_GLOBAL | FR_CHAN | FR_ANYWH, 0, 0, 0, 0, 0 };
  int x;
  char args[1024];

  if (arg[0])
    simple_sprintf(args, "%s %s", cmd, arg);
  else
    strcpy(args, cmd);
  get_user_flagrec(u, &fr, NULL);
  Tcl_SetVar(interp, "_msgm1", nick, 0);
  Tcl_SetVar(interp, "_msgm2", uhost, 0);
  Tcl_SetVar(interp, "_msgm3", u ? u->handle : "*", 0);
  Tcl_SetVar(interp, "_msgm4", args, 0);
  x = check_tcl_bind(H_msgm, args, &fr, " $_msgm1 $_msgm2 $_msgm3 $_msgm4",
                     MATCH_MASK | BIND_USE_ATTR | BIND_STACKABLE | BIND_STACKRET);

  /*
   * 0 - no match
   * 1 - match, log
   * 2 - match, don't log
   */
  if (x == BIND_NOMATCH)
    return 0;
  if (x == BIND_EXEC_LOG)
    return 2;

  return 1;
}

static int check_tcl_notc(char *nick, char *uhost, struct userrec *u,
                           char *dest, char *arg)
{
  struct flag_record fr = { FR_GLOBAL | FR_CHAN | FR_ANYWH, 0, 0, 0, 0, 0 };
  int x;

  get_user_flagrec(u, &fr, NULL);
  Tcl_SetVar(interp, "_notc1", nick, 0);
  Tcl_SetVar(interp, "_notc2", uhost, 0);
  Tcl_SetVar(interp, "_notc3", u ? u->handle : "*", 0);
  Tcl_SetVar(interp, "_notc4", arg, 0);
  Tcl_SetVar(interp, "_notc5", dest, 0);
  x = check_tcl_bind(H_notc, arg, &fr, " $_notc1 $_notc2 $_notc3 $_notc4 $_notc5",
                     MATCH_MASK | BIND_USE_ATTR | BIND_STACKABLE | BIND_STACKRET);

  /*
   * 0 - no match
   * 1 - match, log
   * 2 - match, don't log
   */
  if (x == BIND_NOMATCH)
    return 0;
  if (x == BIND_EXEC_LOG)
    return 2;

  return 1;
}

static int check_tcl_raw(char *from, char *code, char *msg)
{
  int x;

  Tcl_SetVar(interp, "_raw1", from, 0);
  Tcl_SetVar(interp, "_raw2", code, 0);
  Tcl_SetVar(interp, "_raw3", msg, 0);
  x = check_tcl_bind(H_raw, code, 0, " $_raw1 $_raw2 $_raw3",
                     MATCH_EXACT | BIND_STACKABLE | BIND_WANTRET);

  /* Return 1 if processed */
  return (x == BIND_EXEC_LOG);
}

static int check_tcl_ctcpr(char *nick, char *uhost, struct userrec *u,
                           char *dest, char *keyword, char *args,
                           p_tcl_bind_list table)
{
  struct flag_record fr = { FR_GLOBAL | FR_CHAN | FR_ANYWH, 0, 0, 0, 0, 0 };
  int x;

  get_user_flagrec(u, &fr, NULL);
  Tcl_SetVar(interp, "_ctcpr1", nick, 0);
  Tcl_SetVar(interp, "_ctcpr2", uhost, 0);
  Tcl_SetVar(interp, "_ctcpr3", u ? u->handle : "*", 0);
  Tcl_SetVar(interp, "_ctcpr4", dest, 0);
  Tcl_SetVar(interp, "_ctcpr5", keyword, 0);
  Tcl_SetVar(interp, "_ctcpr6", args, 0);
  x = check_tcl_bind(table, keyword, &fr,
                     " $_ctcpr1 $_ctcpr2 $_ctcpr3 $_ctcpr4 $_ctcpr5 $_ctcpr6",
                     MATCH_MASK | BIND_USE_ATTR | BIND_STACKABLE |
                     ((table == H_ctcp) ? BIND_WANTRET : 0));
  return (x == BIND_EXEC_LOG) || (table == H_ctcr);
}

static int check_tcl_wall(char *from, char *msg)
{
  int x;

  Tcl_SetVar(interp, "_wall1", from, 0);
  Tcl_SetVar(interp, "_wall2", msg, 0);
  x = check_tcl_bind(H_wall, msg, 0, " $_wall1 $_wall2",
                     MATCH_MASK | BIND_STACKABLE | BIND_STACKRET);

  /*
   * 0 - no match
   * 1 - match, log
   * 2 - match, don't log
   */
  if (x == BIND_NOMATCH)
    return 0;
  if (x == BIND_EXEC_LOG)
    return 2;

  return 1;
}

static int check_tcl_flud(char *nick, char *uhost, struct userrec *u,
                          char *ftype, char *chname)
{
  int x;

  Tcl_SetVar(interp, "_flud1", nick, 0);
  Tcl_SetVar(interp, "_flud2", uhost, 0);
  Tcl_SetVar(interp, "_flud3", u ? u->handle : "*", 0);
  Tcl_SetVar(interp, "_flud4", ftype, 0);
  Tcl_SetVar(interp, "_flud5", chname, 0);
  x = check_tcl_bind(H_flud, ftype, 0,
                     " $_flud1 $_flud2 $_flud3 $_flud4 $_flud5",
                     MATCH_MASK | BIND_STACKABLE | BIND_WANTRET);
  return (x == BIND_EXEC_LOG);
}

static int match_my_nick(char *nick)
{
  if (!rfc_casecmp(nick, botname))
    return 1;
  return 0;
}

/* 001: welcome to IRC (use it to fix the server name) */
static int got001(char *from, char *msg)
{
  struct server_list *x = serverlist;
  int i;
  struct chanset_t *chan;

  /* FIXME - x should never be NULL anywhere in this function, but
   * apparently it sometimes is. */
  if (x) {
    for (i = curserv; i > 0 && x; i--)
      x = x->next;
    if (!x) {
      putlog(LOG_MISC, "*", "Invalid server list!");
    } else {
      if (x->realname)
        nfree(x->realname);
      x->realname = nmalloc(strlen(from) + 1);
      strcpy(x->realname, from);
    }
    if (realservername)
      nfree(realservername);
    realservername = nmalloc(strlen(from) + 1);
    strcpy(realservername, from);
  } else
    putlog(LOG_MISC, "*", "No server list!");

  server_online = now;
  fixcolon(msg);
  strncpyz(botname, msg, NICKLEN);
  altnick_char = 0;
  dprintf(DP_SERVER, "WHOIS %s\n", botname); /* get user@host */
  if (initserver[0])
    do_tcl("init-server", initserver); /* Call Tcl init-server */
  check_tcl_event("init-server");

  if (!x)
    return 0;

  if (module_find("irc", 0, 0)) {  /* Only join if the IRC module is loaded. */
    for (chan = chanset; chan; chan = chan->next) {
      chan->status &= ~(CHAN_ACTIVE | CHAN_PEND);
      if (!channel_inactive(chan)) {
        dprintf(DP_SERVER, "JOIN %s %s\n", (chan->name[0]) ? chan->name :
                chan->dname, chan->channel.key[0] ? chan->channel.key :
                chan->key_prot);
      }
    }
  }

  return 0;
}

/* Got 442: not on channel
 */
static int got442(char *from, char *msg)
{
  char *chname;
  struct chanset_t *chan;

  if (!realservername || egg_strcasecmp(from, realservername))
    return 0;
  newsplit(&msg);
  chname = newsplit(&msg);
  chan = findchan(chname);
  if (chan)
    if (!channel_inactive(chan)) {
      module_entry *me = module_find("channels", 0, 0);

      putlog(LOG_MISC, chname, IRC_SERVNOTONCHAN, chname);
      if (me && me->funcs)
        (me->funcs[CHANNEL_CLEAR]) (chan, 1);
      chan->status &= ~CHAN_ACTIVE;
      dprintf(DP_MODE, "JOIN %s %s\n", chan->name,
              chan->channel.key[0] ? chan->channel.key : chan->key_prot);
    }

  return 0;
}

/* Close the current server connection.
 */
static void nuke_server(char *reason)
{
  if (serv >= 0) {
    int servidx = findanyidx(serv);

    if (reason && (servidx > 0))
      dprintf(servidx, "QUIT :%s\n", reason);
    disconnect_server(servidx);
    lostdcc(servidx);
  }
}

static char ctcp_reply[1024] = "";

static int lastmsgs[FLOOD_GLOBAL_MAX];
static char lastmsghost[FLOOD_GLOBAL_MAX][81];
static time_t lastmsgtime[FLOOD_GLOBAL_MAX];

/* Do on NICK, PRIVMSG, NOTICE and JOIN.
 */
static int detect_flood(char *floodnick, char *floodhost, char *from, int which)
{
  char *p, ftype[10], h[1024];
  struct userrec *u;
  int thr = 0, lapse = 0, atr;

  /* Okay, make sure i'm not flood-checking myself */
  if (match_my_nick(floodnick))
    return 0;

  /* My user@host (?) */
  if (!egg_strcasecmp(floodhost, botuserhost))
    return 0;

  u = get_user_by_host(from);
  atr = u ? u->flags : 0;
  if (atr & (USER_BOT | USER_FRIEND))
    return 0;

  /* Determine how many are necessary to make a flood */
  switch (which) {
  case FLOOD_PRIVMSG:
  case FLOOD_NOTICE:
    thr = flud_thr;
    lapse = flud_time;
    strcpy(ftype, "msg");
    break;
  case FLOOD_CTCP:
    thr = flud_ctcp_thr;
    lapse = flud_ctcp_time;
    strcpy(ftype, "ctcp");
    break;
  }
  if ((thr == 0) || (lapse == 0))
    return 0;                   /* No flood protection */

  p = strchr(floodhost, '@');
  if (p) {
    p++;
    if (egg_strcasecmp(lastmsghost[which], p)) {        /* New */
      strcpy(lastmsghost[which], p);
      lastmsgtime[which] = now;
      lastmsgs[which] = 0;
      return 0;
    }
  } else
    return 0;                   /* Uh... whatever. */

  if (lastmsgtime[which] < now - lapse) {
    /* Flood timer expired, reset it */
    lastmsgtime[which] = now;
    lastmsgs[which] = 0;
    return 0;
  }
  lastmsgs[which]++;
  if (lastmsgs[which] >= thr) { /* FLOOD */
    /* Reset counters */
    lastmsgs[which] = 0;
    lastmsgtime[which] = 0;
    lastmsghost[which][0] = 0;
    u = get_user_by_host(from);
    if (check_tcl_flud(floodnick, floodhost, u, ftype, "*"))
      return 0;
    /* Private msg */
    simple_sprintf(h, "*!*@%s", p);
    putlog(LOG_MISC, "*", IRC_FLOODIGNORE1, p);
    addignore(h, botnetnick, (which == FLOOD_CTCP) ? "CTCP flood" :
              "MSG/NOTICE flood", now + (60 * ignore_time));
  }
  return 0;
}

/* Check for more than 8 control characters in a line.
 * This could indicate: beep flood CTCP avalanche.
 */
static int detect_avalanche(char *msg)
{
  int count = 0;
  unsigned char *p;

  for (p = (unsigned char *) msg; (*p) && (count < 8); p++)
    if ((*p == 7) || (*p == 1))
      count++;
  if (count >= 8)
    return 1;
  else
    return 0;
}

/* Got a private message.
 */
static int gotmsg(char *from, char *msg)
{
  char *to, buf[UHOSTLEN], *nick, ctcpbuf[512], *uhost = buf, *ctcp,
       *p, *p1, *code;
  struct userrec *u;
  int ctcp_count = 0;
  int ignoring;

  /* Notice to a channel, not handled here */
  if (msg[0] && ((strchr(CHANMETA, *msg) != NULL) || (*msg == '@')))
    return 0;

  ignoring = match_ignore(from);
  to = newsplit(&msg);
  fixcolon(msg);
  /* Only check if flood-ctcp is active */
  strcpy(uhost, from);
  nick = splitnick(&uhost);
  if (flud_ctcp_thr && detect_avalanche(msg)) {
    if (!ignoring) {
      putlog(LOG_MODES, "*", "Avalanche from %s - ignoring", from);
      p = strchr(uhost, '@');
      if (p != NULL)
        p++;
      else
        p = uhost;
      simple_sprintf(ctcpbuf, "*!*@%s", p);
      addignore(ctcpbuf, botnetnick, "ctcp avalanche",
                now + (60 * ignore_time));
    }
  }
  /* Check for CTCP: */
  ctcp_reply[0] = 0;
  p = strchr(msg, 1);
  while ((p != NULL) && (*p)) {
    p++;
    p1 = p;
    while ((*p != 1) && (*p != 0))
      p++;
    if (*p == 1) {
      *p = 0;
      ctcp = strcpy(ctcpbuf, p1);
      strcpy(p1 - 1, p + 1);
      if (!ignoring)
        detect_flood(nick, uhost, from,
                     strncmp(ctcp, "ACTION ", 7) ? FLOOD_CTCP : FLOOD_PRIVMSG);
      /* Respond to the first answer_ctcp */
      p = strchr(msg, 1);
      if (ctcp_count < answer_ctcp) {
        ctcp_count++;
        if (ctcp[0] != ' ') {
          code = newsplit(&ctcp);

          /* CTCP from oper, don't interpret */
          if ((to[0] == '$') || strchr(to, '.')) {
            if (!ignoring)
              putlog(LOG_PUBLIC, to, "CTCP %s: %s from %s (%s) to %s",
                     code, ctcp, nick, uhost, to);
          } else {
            u = get_user_by_host(from);
            if (!ignoring || trigger_on_ignore) {
              if (!check_tcl_ctcp(nick, uhost, u, to, code, ctcp) && !ignoring) {
                if ((lowercase_ctcp && !egg_strcasecmp(code, "DCC")) ||
                    (!lowercase_ctcp && !strcmp(code, "DCC"))) {
                  /* If it gets this far unhandled, it means that
                   * the user is totally unknown.
                   */
                  code = newsplit(&ctcp);
                  if (!strcmp(code, "CHAT")) {
                    if (!quiet_reject) {
                      if (u)
                        dprintf(DP_HELP, "NOTICE %s :I'm not accepting calls "
                                "at the moment.\n", nick);
                      else
                        dprintf(DP_HELP, "NOTICE %s :%s\n", nick,
                                DCC_NOSTRANGERS);
                    }
                    putlog(LOG_MISC, "*", "%s: %s", DCC_REFUSED, from);
                  } else
                    putlog(LOG_MISC, "*", "Refused DCC %s: %s", code, from);
                }
              }
              if (!strcmp(code, "ACTION")) {
                putlog(LOG_MSGS, "*", "Action to %s: %s %s", to, nick, ctcp);
              } else {
                putlog(LOG_MSGS, "*", "CTCP %s: %s from %s (%s)", code, ctcp,
                       nick, uhost);
              }                 /* I love a good close cascade ;) */
            }
          }
        }
      }
    }
  }
  /* Send out possible ctcp responses */
  if (ctcp_reply[0]) {
    if (ctcp_mode != 2) {
      dprintf(DP_HELP, "NOTICE %s :%s\n", nick, ctcp_reply);
    } else {
      if (now - last_ctcp > flud_ctcp_time) {
        dprintf(DP_HELP, "NOTICE %s :%s\n", nick, ctcp_reply);
        count_ctcp = 1;
      } else if (count_ctcp < flud_ctcp_thr) {
        dprintf(DP_HELP, "NOTICE %s :%s\n", nick, ctcp_reply);
        count_ctcp++;
      }
      last_ctcp = now;
    }
  }
  if (msg[0]) {
    int result = 0;

    /* Msg from oper, don't interpret */
    if ((to[0] == '$') || (strchr(to, '.') != NULL)) {
      if (!ignoring) {
        detect_flood(nick, uhost, from, FLOOD_PRIVMSG);
        putlog(LOG_MSGS | LOG_SERV, "*", "[%s!%s to %s] %s",
               nick, uhost, to, msg);
      }
      return 0;
    }

    detect_flood(nick, uhost, from, FLOOD_PRIVMSG);
    u = get_user_by_host(from);
    code = newsplit(&msg);
    rmspace(msg);

    if (!ignoring || trigger_on_ignore) {
      result = check_tcl_msgm(code, nick, uhost, u, msg);

      if (!result || !exclusive_binds)
        if (check_tcl_msg(code, nick, uhost, u, msg))
          return 0;
    }

    if (!ignoring && result != 2)
      putlog(LOG_MSGS, "*", "[%s] %s %s", from, code, msg);
  }
  return 0;
}

/* Got a private notice.
 */
static int gotnotice(char *from, char *msg)
{
  char *to, *nick, ctcpbuf[512], *p, *p1, buf[512], *uhost = buf, *ctcp;
  struct userrec *u;
  int ignoring;

  /* Notice to a channel, not handled here */
  if (msg[0] && ((strchr(CHANMETA, *msg) != NULL) || (*msg == '@')))
    return 0;

  ignoring = match_ignore(from);
  to = newsplit(&msg);
  fixcolon(msg);
  strcpy(uhost, from);
  nick = splitnick(&uhost);
  if (flud_ctcp_thr && detect_avalanche(msg)) {
    /* Discard -- kick user if it was to the channel */
    if (!ignoring)
      putlog(LOG_MODES, "*", "Avalanche from %s", from);
    return 0;
  }
  /* Check for CTCP: */
  p = strchr(msg, 1);
  while ((p != NULL) && (*p)) {
    p++;
    p1 = p;
    while ((*p != 1) && (*p != 0))
      p++;
    if (*p == 1) {
      *p = 0;
      ctcp = strcpy(ctcpbuf, p1);
      strcpy(p1 - 1, p + 1);
      if (!ignoring)
        detect_flood(nick, uhost, from, FLOOD_CTCP);
      p = strchr(msg, 1);
      if (ctcp[0] != ' ') {
        char *code = newsplit(&ctcp);

        /* CTCP reply from oper, don't interpret */
        if ((to[0] == '$') || strchr(to, '.')) {
          if (!ignoring)
            putlog(LOG_PUBLIC, "*",
                   "CTCP reply %s: %s from %s (%s) to %s", code, ctcp,
                   nick, uhost, to);
        } else {
          u = get_user_by_host(from);
          if (!ignoring || trigger_on_ignore) {
            check_tcl_ctcr(nick, uhost, u, to, code, ctcp);
            if (!ignoring)
              /* Who cares? */
              putlog(LOG_MSGS, "*",
                     "CTCP reply %s: %s from %s (%s) to %s",
                     code, ctcp, nick, uhost, to);
          }
        }
      }
    }
  }
  if (msg[0]) {

    /* Notice from oper, don't interpret */
    if ((to[0] == '$') || (strchr(to, '.') != NULL)) {
      if (!ignoring) {
        detect_flood(nick, uhost, from, FLOOD_NOTICE);
        putlog(LOG_MSGS | LOG_SERV, "*", "-%s (%s) to %s- %s",
               nick, uhost, to, msg);
      }
      return 0;
    }

    /* Server notice? */
    if ((nick[0] == 0) || (uhost[0] == 0)) {

      /* Hidden `250' connection count message from server */
      if (strncmp(msg, "Highest connection count:", 25))
        putlog(LOG_SERV, "*", "-NOTICE- %s", msg);

      return 0;
    }

    detect_flood(nick, uhost, from, FLOOD_NOTICE);
    u = get_user_by_host(from);

    if (!ignoring || trigger_on_ignore)
      if (check_tcl_notc(nick, uhost, u, botname, msg) == 2)
        return 0;

    if (!ignoring)
      putlog(LOG_MSGS, "*", "-%s (%s)- %s", nick, uhost, msg);
  }
  return 0;
}

/* got 251: lusers
 * <server> 251 <to> :there are 2258 users and 805 invisible on 127 servers
 */
static int got251(char *from, char *msg)
{
  int i;
  char *servs;

  if (min_servs == 0)
    return 0;                   /* No minimum limit on servers */
  newsplit(&msg);
  fixcolon(msg);                /* NOTE!!! If servlimit is not set or is 0 */
  for (i = 0; i < 8; i++)
    newsplit(&msg);             /* lusers IS NOT SENT AT ALL!! */
  servs = newsplit(&msg);
  if (strncmp(msg, "servers", 7))
    return 0;                   /* Was invalid format */
  while (*servs && (*servs < 32))
    servs++;                    /* I've seen some lame nets put bolds &
                                 * stuff in here :/ */
  i = atoi(servs);
  if (i < min_servs) {
    putlog(LOG_SERV, "*", IRC_AUTOJUMP, min_servs, i);
    nuke_server(IRC_CHANGINGSERV);
  }
  return 0;
}

/* WALLOPS: oper's nuisance
 */
static int gotwall(char *from, char *msg)
{
  char *nick;

  fixcolon(msg);

  if (check_tcl_wall(from, msg) != 2) {
    if (strchr(from, '!')) {
      nick = splitnick(&from);
      putlog(LOG_WALL, "*", "!%s(%s)! %s", nick, from, msg);
    } else
      putlog(LOG_WALL, "*", "!%s! %s", from, msg);
  }
  return 0;
}

/* Called once a minute... but if we're the only one on the
 * channel, we only wanna send out "lusers" once every 5 mins.
 */
static void minutely_checks()
{
  char *alt;
  static int count = 4;
  int ok = 0;
  struct chanset_t *chan;

  /* Only check if we have already successfully logged in.  */
  if (!server_online)
    return;
  if (keepnick) {
    /* NOTE: now that botname can but upto NICKLEN bytes long,
     * check that it's not just a truncation of the full nick.
     */
    if (strncmp(botname, origbotname, strlen(botname))) {
      /* See if my nickname is in use and if if my nick is right. */
      alt = get_altbotnick();
      if (alt[0] && egg_strcasecmp(botname, alt))
        dprintf(DP_SERVER, "ISON :%s %s %s\n", botname, origbotname, alt);
      else
        dprintf(DP_SERVER, "ISON :%s %s\n", botname, origbotname);
    }
  }
  if (min_servs == 0)
    return;
  for (chan = chanset; chan; chan = chan->next)
    if (channel_active(chan) && chan->channel.members == 1) {
      ok = 1;
      break;
    }
  if (!ok)
    return;
  count++;
  if (count >= 5) {
    dprintf(DP_SERVER, "LUSERS\n");
    count = 0;
  }
}

/* Pong from server.
 */
static int gotpong(char *from, char *msg)
{
  newsplit(&msg);
  fixcolon(msg);                /* Scrap server name */
  server_lag = now - my_atoul(msg);
  if (server_lag > 99999) {
    /* IRCnet lagmeter support by drummer */
    server_lag = now - lastpingtime;
  }
  return 0;
}

/* This is a reply on ISON :<current> <orig> [<alt>]
 */
static void got303(char *from, char *msg)
{
  char *tmp, *alt;
  int ison_orig = 0, ison_alt = 0;

  if (!keepnick || !strncmp(botname, origbotname, strlen(botname))) {
    return;
  }
  newsplit(&msg);
  fixcolon(msg);
  alt = get_altbotnick();
  tmp = newsplit(&msg);
  if (tmp[0] && !rfc_casecmp(botname, tmp)) {
    while ((tmp = newsplit(&msg))[0]) { /* no, it's NOT == */
      if (!rfc_casecmp(tmp, origbotname))
        ison_orig = 1;
      else if (alt[0] && !rfc_casecmp(tmp, alt))
        ison_alt = 1;
    }
    if (!ison_orig) {
      if (!nick_juped)
        putlog(LOG_MISC, "*", IRC_GETORIGNICK, origbotname);
      dprintf(DP_SERVER, "NICK %s\n", origbotname);
    } else if (alt[0] && !ison_alt && rfc_casecmp(botname, alt)) {
      putlog(LOG_MISC, "*", IRC_GETALTNICK, alt);
      dprintf(DP_SERVER, "NICK %s\n", alt);
    }
  }
}

/* 432 : Bad nickname
 */
static int got432(char *from, char *msg)
{
  char *erroneus;

  newsplit(&msg);
  erroneus = newsplit(&msg);
  if (server_online)
    putlog(LOG_MISC, "*", "NICK IS INVALID: %s (keeping '%s').", erroneus,
           botname);
  else {
    putlog(LOG_MISC, "*", IRC_BADBOTNICK);
    if (!keepnick) {
      makepass(erroneus);
      erroneus[NICKMAX] = 0;
      dprintf(DP_MODE, "NICK %s\n", erroneus);
    }
    return 0;
  }
  return 0;
}

/* 433 : Nickname in use
 * Change nicks till we're acceptable or we give up
 */
static int got433(char *from, char *msg)
{
  char *tmp;

  if (server_online) {
    /* We are online and have a nickname, we'll keep it */
    newsplit(&msg);
    tmp = newsplit(&msg);
    putlog(LOG_MISC, "*", "NICK IN USE: %s (keeping '%s').", tmp, botname);
    nick_juped = 0;
    return 0;
  }
  gotfake433(from);
  return 0;
}

/* 437 : Nickname juped (IRCnet)
 */
static int got437(char *from, char *msg)
{
  char *s;
  struct chanset_t *chan;

  newsplit(&msg);
  s = newsplit(&msg);
  if (s[0] && (strchr(CHANMETA, s[0]) != NULL)) {
    chan = findchan(s);
    if (chan) {
      if (chan->status & CHAN_ACTIVE) {
        putlog(LOG_MISC, "*", IRC_CANTCHANGENICK, s);
      } else {
        if (!channel_juped(chan)) {
          putlog(LOG_MISC, "*", IRC_CHANNELJUPED, s);
          chan->status |= CHAN_JUPED;
        }
      }
    }
  } else if (server_online) {
    if (!nick_juped)
      putlog(LOG_MISC, "*", "NICK IS JUPED: %s (keeping '%s').", s, botname);
    if (!rfc_casecmp(s, origbotname))
      nick_juped = 1;
  } else {
    putlog(LOG_MISC, "*", "%s: %s", IRC_BOTNICKJUPED, s);
    gotfake433(from);
  }
  return 0;
}

/* 438 : Nick change too fast
 */
static int got438(char *from, char *msg)
{
  newsplit(&msg);
  newsplit(&msg);
  fixcolon(msg);
  putlog(LOG_MISC, "*", "%s", msg);
  return 0;
}

static int got451(char *from, char *msg)
{
  /* Usually if we get this then we really messed up somewhere
   * or this is a non-standard server, so we log it and kill the socket
   * hoping the next server will work :) -poptix
   */
  /* Um, this does occur on a lagged anti-spoof server connection if the
   * (minutely) sending of joins occurs before the bot does its ping reply.
   * Probably should do something about it some time - beldin
   */
  putlog(LOG_MISC, "*", IRC_NOTREGISTERED1, from);
  nuke_server(IRC_NOTREGISTERED2);
  return 0;
}

/* Got error notice
 */
static int goterror(char *from, char *msg)
{
  /* FIXME: fixcolon doesn't do what we need here, this is a temp fix
   * fixcolon(msg);
   */
  if (msg[0] == ':')
    msg++;
  putlog(LOG_SERV | LOG_MSGS, "*", "-ERROR from server- %s", msg);
  if (serverror_quit) {
    putlog(LOG_SERV, "*", "Disconnecting from server.");
    nuke_server("Bah, stupid error messages.");
  }
  return 1;
}

/* Got nick change.
 */
static int gotnick(char *from, char *msg)
{
  char *nick, *alt = get_altbotnick();

  nick = splitnick(&from);
  fixcolon(msg);
  check_queues(nick, msg);
  if (match_my_nick(nick)) {
    /* Regained nick! */
    strncpyz(botname, msg, NICKLEN);
    altnick_char = 0;
    if (!strcmp(msg, origbotname)) {
      putlog(LOG_SERV | LOG_MISC, "*", "Regained nickname '%s'.", msg);
      nick_juped = 0;
    } else if (alt[0] && !strcmp(msg, alt))
      putlog(LOG_SERV | LOG_MISC, "*", "Regained alternate nickname '%s'.",
             msg);
    else if (keepnick && strcmp(nick, msg)) {
      putlog(LOG_SERV | LOG_MISC, "*", "Nickname changed to '%s'???", msg);
      if (!rfc_casecmp(nick, origbotname)) {
        putlog(LOG_MISC, "*", IRC_GETORIGNICK, origbotname);
        dprintf(DP_SERVER, "NICK %s\n", origbotname);
      } else if (alt[0] && !rfc_casecmp(nick, alt) &&
               egg_strcasecmp(botname, origbotname)) {
        putlog(LOG_MISC, "*", IRC_GETALTNICK, alt);
        dprintf(DP_SERVER, "NICK %s\n", alt);
      }
    } else
      putlog(LOG_SERV | LOG_MISC, "*", "Nickname changed to '%s'???", msg);
  } else if ((keepnick) && (rfc_casecmp(nick, msg))) {
    /* Only do the below if there was actual nick change, case doesn't count */
    if (!rfc_casecmp(nick, origbotname)) {
      putlog(LOG_MISC, "*", IRC_GETORIGNICK, origbotname);
      dprintf(DP_SERVER, "NICK %s\n", origbotname);
    } else if (alt[0] && !rfc_casecmp(nick, alt) &&
             egg_strcasecmp(botname, origbotname)) {
      putlog(LOG_MISC, "*", IRC_GETALTNICK, altnick);
      dprintf(DP_SERVER, "NICK %s\n", altnick);
    }
  }
  return 0;
}

static int gotmode(char *from, char *msg)
{
  char *ch;

  ch = newsplit(&msg);
  /* Usermode changes? */
  if (strchr(CHANMETA, ch[0]) == NULL) {
    if (match_my_nick(ch) && check_mode_r) {
      /* umode +r? - D0H dalnet uses it to mean something different */
      fixcolon(msg);
      if ((msg[0] == '+') && strchr(msg, 'r')) {
        int servidx = findanyidx(serv);

        putlog(LOG_MISC | LOG_JOIN, "*",
               "%s has me i-lined (jumping)", dcc[servidx].host);
        nuke_server("i-lines suck");
      }
    }
  }
  return 0;
}

static void disconnect_server(int idx)
{
  if (server_online > 0)
    check_tcl_event("disconnect-server");
  server_online = 0;
  if (realservername)
    nfree(realservername);
  realservername = 0;
  if (dcc[idx].sock >= 0)
    killsock(dcc[idx].sock);
  dcc[idx].sock = -1;
  serv = -1;
  botuserhost[0] = 0;
}

static void eof_server(int idx)
{
  putlog(LOG_SERV, "*", "%s %s", IRC_DISCONNECTED, dcc[idx].host);
  disconnect_server(idx);
  lostdcc(idx);
}

static void display_server(int idx, char *buf)
{
  sprintf(buf, "%s  (lag: %d)", trying_server ? "conn" : "serv", server_lag);
}

static void connect_server(void);

static void kill_server(int idx, void *x)
{
  module_entry *me;

  disconnect_server(idx);
  if ((me = module_find("channels", 0, 0)) && me->funcs) {
    struct chanset_t *chan;

    for (chan = chanset; chan; chan = chan->next)
      (me->funcs[CHANNEL_CLEAR]) (chan, 1);
  }
  /* A new server connection will be automatically initiated in
   * about 2 seconds. */
}

static void timeout_server(int idx)
{
  putlog(LOG_SERV, "*", "Timeout: connect to %s", dcc[idx].host);
  disconnect_server(idx);
  lostdcc(idx);
}

static void server_activity(int idx, char *msg, int len);

static struct dcc_table SERVER_SOCKET = {
  "SERVER",
  0,
  eof_server,
  server_activity,
  NULL,
  timeout_server,
  display_server,
  NULL,
  kill_server,
  NULL
};

static void server_activity(int idx, char *msg, int len)
{
  char *from, *code;

  if (trying_server) {
    strcpy(dcc[idx].nick, "(server)");
    putlog(LOG_SERV, "*", "Connected to %s", dcc[idx].host);
    trying_server = 0;
    SERVER_SOCKET.timeout_val = 0;
  }
  waiting_for_awake = 0;
  from = "";
  if (msg[0] == ':') {
    msg++;
    from = newsplit(&msg);
  }
  code = newsplit(&msg);
  if (raw_log && ((strcmp(code, "PRIVMSG") && strcmp(code, "NOTICE")) ||
      !match_ignore(from)))
    putlog(LOG_RAW, "*", "[@] %s %s %s", from, code, msg);
  /* This has GOT to go into the raw binding table, * merely because this
   * is less effecient.
   */
  check_tcl_raw(from, code, msg);
}

static int gotping(char *from, char *msg)
{
  fixcolon(msg);
  dprintf(DP_MODE, "PONG :%s\n", msg);
  return 0;
}

static int gotkick(char *from, char *msg)
{
  char *nick;

  nick = from;
  if (rfc_casecmp(nick, botname))
    /* Not my kick, I don't need to bother about it. */
    return 0;
  if (use_penalties) {
    last_time += 2;
    if (raw_log)
      putlog(LOG_SRVOUT, "*", "adding 2secs penalty (successful kick)");
  }
  return 0;
}

/* Another sec penalty if bot did a whois on another server.
 */
static int whoispenalty(char *from, char *msg)
{
  if (realservername && use_penalties) {
    if (strcmp(realservername, from)) {
      last_time += 1;
      if (raw_log)
        putlog(LOG_SRVOUT, "*", "adding 1sec penalty (remote whois)");
    }
  }
  return 0;
}

static int got311(char *from, char *msg)
{
  char *n1, *n2, *u, *h;

  n1 = newsplit(&msg);
  n2 = newsplit(&msg);
  u = newsplit(&msg);
  h = newsplit(&msg);

  if (!n1 || !n2 || !u || !h)
    return 0;

  if (match_my_nick(n2))
    egg_snprintf(botuserhost, sizeof botuserhost, "%s@%s", u, h);

  return 0;
}

static cmd_t my_raw_binds[] = {
  {"PRIVMSG", "",   (Function) gotmsg,       NULL},
  {"NOTICE",  "",   (Function) gotnotice,    NULL},
  {"MODE",    "",   (Function) gotmode,      NULL},
  {"PING",    "",   (Function) gotping,      NULL},
  {"PONG",    "",   (Function) gotpong,      NULL},
  {"WALLOPS", "",   (Function) gotwall,      NULL},
  {"001",     "",   (Function) got001,       NULL},
  {"251",     "",   (Function) got251,       NULL},
  {"303",     "",   (Function) got303,       NULL},
  {"432",     "",   (Function) got432,       NULL},
  {"433",     "",   (Function) got433,       NULL},
  {"437",     "",   (Function) got437,       NULL},
  {"438",     "",   (Function) got438,       NULL},
  {"451",     "",   (Function) got451,       NULL},
  {"442",     "",   (Function) got442,       NULL},
  {"NICK",    "",   (Function) gotnick,      NULL},
  {"ERROR",   "",   (Function) goterror,     NULL},
/* ircu2.10.10 has a bug when a client is throttled ERROR is sent wrong */
  {"ERROR:",  "",   (Function) goterror,     NULL},
  {"KICK",    "",   (Function) gotkick,      NULL},
  {"318",     "",   (Function) whoispenalty, NULL},
  {"311",     "",   (Function) got311,       NULL},
  {NULL,      NULL, NULL,                    NULL}
};

static void server_resolve_success(int);
static void server_resolve_failure(int);

/* Hook up to a server
 */
static void connect_server(void)
{
  char pass[121], botserver[UHOSTLEN];
  static int oldserv = -1;
  int servidx;
  unsigned int botserverport = 0;

  waiting_for_awake = 0;
  trying_server = now;
  empty_msgq();
  /* Start up the counter (always reset it if "never-give-up" is on) */
  if ((oldserv < 0) || (never_give_up))
    oldserv = curserv;
  if (newserverport) {          /* Jump to specified server */
    curserv = -1;             /* Reset server list */
    strcpy(botserver, newserver);
    botserverport = newserverport;
    strcpy(pass, newserverpass);
    newserver[0] = 0;
    newserverport = 0;
    newserverpass[0] = 0;
    oldserv = -1;
  } else
    pass[0] = 0;
  if (!cycle_time) {
    struct chanset_t *chan;
    struct server_list *x = serverlist;

    if (!x) {
      putlog(LOG_SERV, "*", "No servers in server list");
      cycle_time = 300;
      return;
    }

    servidx = new_dcc(&DCC_DNSWAIT, sizeof(struct dns_info));
    if (servidx < 0) {
      putlog(LOG_SERV, "*",
             "NO MORE DCC CONNECTIONS -- Can't create server connection.");
      return;
    }

    if (connectserver[0])       /* drummer */
      do_tcl("connect-server", connectserver);
    check_tcl_event("connect-server");
    next_server(&curserv, botserver, &botserverport, pass);
    putlog(LOG_SERV, "*", "%s %s:%d", IRC_SERVERTRY, botserver, botserverport);

    dcc[servidx].port = botserverport;
    strcpy(dcc[servidx].nick, "(server)");
    strncpyz(dcc[servidx].host, botserver, UHOSTLEN);

    botuserhost[0] = 0;

    nick_juped = 0;
    for (chan = chanset; chan; chan = chan->next)
      chan->status &= ~CHAN_JUPED;

    dcc[servidx].timeval = now;
    dcc[servidx].sock = -1;
    dcc[servidx].u.dns->host = get_data_ptr(strlen(dcc[servidx].host) + 1);
    strcpy(dcc[servidx].u.dns->host, dcc[servidx].host);
    dcc[servidx].u.dns->cbuf = get_data_ptr(strlen(pass) + 1);
    strcpy(dcc[servidx].u.dns->cbuf, pass);
    dcc[servidx].u.dns->dns_success = server_resolve_success;
    dcc[servidx].u.dns->dns_failure = server_resolve_failure;
    dcc[servidx].u.dns->dns_type = RES_IPBYHOST;
    dcc[servidx].u.dns->type = &SERVER_SOCKET;

    if (server_cycle_wait)
      /* Back to 1st server & set wait time.
       * Note: Put it here, just in case the server quits on us quickly
       */
      cycle_time = server_cycle_wait;
    else
      cycle_time = 0;

    /* I'm resolving... don't start another server connect request */
    resolvserv = 1;
    /* Resolve the hostname. */
    dcc_dnsipbyhost(dcc[servidx].host);
  }
}

static void server_resolve_failure(int servidx)
{
  serv = -1;
  resolvserv = 0;
  putlog(LOG_SERV, "*", "%s %s (%s)", IRC_FAILEDCONNECT, dcc[servidx].host,
         IRC_DNSFAILED);
  lostdcc(servidx);
}

static void server_resolve_success(int servidx)
{
  int oldserv = dcc[servidx].u.dns->ibuf;
  char s[121], pass[121];

  resolvserv = 0;
  dcc[servidx].addr = dcc[servidx].u.dns->ip;
  strcpy(pass, dcc[servidx].u.dns->cbuf);
  changeover_dcc(servidx, &SERVER_SOCKET, 0);
  serv = open_telnet(iptostr(htonl(dcc[servidx].addr)), dcc[servidx].port);
  if (serv < 0) {
    neterror(s);
    putlog(LOG_SERV, "*", "%s %s (%s)", IRC_FAILEDCONNECT, dcc[servidx].host,
           s);
    lostdcc(servidx);
    if (oldserv == curserv && !never_give_up)
      fatal("NO SERVERS WILL ACCEPT MY CONNECTION.", 0);
  } else {
    dcc[servidx].sock = serv;
    /* Queue standard login */
    dcc[servidx].timeval = now;
    SERVER_SOCKET.timeout_val = &server_timeout;
    /* Another server may have truncated it, so use the original */
    strcpy(botname, origbotname);
    /* Start alternate nicks from the beginning */
    altnick_char = 0;
    if (pass[0])
      dprintf(DP_MODE, "PASS %s\n", pass);
    dprintf(DP_MODE, "NICK %s\n", botname);

    rmspace(botrealname);
    if (botrealname[0] == 0)
      strcpy(botrealname, "/msg LamestBot hello");
    dprintf(DP_MODE, "USER %s . . :%s\n", botuser, botrealname);

    /* Wait for async result now. */
  }
}
