/*
 *  ircd-ratbox: A slightly useful ircd.
 *  m_error.c: Handles error messages from the other end.
 *
 *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
 *  Copyright (C) 1996-2002 Hybrid Development Team
 *  Copyright (C) 2002-2005 ircd-ratbox 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
 *
 */

#include "stdinc.h"
#include "client.h"
#include "common.h"		/* FALSE */
#include "ircd.h"
#include "numeric.h"
#include "send.h"
#include "msg.h"
#include "modules.h"
#include "logger.h"
#include "s_conf.h"

static int m_error(struct Client *, struct Client *, int, const char **);
static int ms_error(struct Client *, struct Client *, int, const char **);

struct Message error_msgtab = {
    "ERROR", 0, 0, 0, MFLG_SLOW | MFLG_UNREG,
    {{m_error, 0}, mg_ignore, mg_ignore, {ms_error, 0}, mg_ignore, mg_ignore}
};

mapi_clist_av1 error_clist[] = {
    &error_msgtab, NULL
};

DECLARE_MODULE_AV1(error, NULL, NULL, error_clist, NULL, NULL, "$Revision: 494 $");

/* Determine whether an ERROR message is safe to show (no IP address in it) */
static int
is_safe_error(const char *message)
{
    char prefix2[100];
    const char *p;

    if (!strncmp(message, "Closing Link: 127.0.0.1 (", 25))
        return 1;
    rb_snprintf(prefix2, sizeof prefix2,
                "Closing Link: 127.0.0.1 %s (", me.name);
    if (!strncmp(message, prefix2, strlen(prefix2)))
        return 1;
    if (!strncmp(message, "Restart by ", 11))
        return 1;
    if (!strncmp(message, "Terminated by ", 14))
        return 1;

    if (!ircncmp(message, "Closing Link", 12))
        return 0;
    if (strchr(message, '['))
        return 0;
    p = strchr(message, '.');
    if (p != NULL && p[1] != '\0')
        return 0;
    if (strchr(message, ':'))
        return 0;

    return 1;
}

/*
 * Note: At least at protocol level ERROR has only one parameter,
 * although this is called internally from other functions
 * --msa
 *
 *      parv[*] = parameters
 */
int
m_error(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    const char *para;
    int hideit = ConfigFileEntry.hide_error_messages;

    para = (parc > 1 && *parv[1] != '\0') ? parv[1] : "<>";

    if (IsAnyServer(client_p)) {
        ilog(L_SERVER, "Received ERROR message from %s: %s",
             log_client_name(source_p, SHOW_IP), para);
    }

    if(is_safe_error(para))
        hideit = 0;
    if(IsAnyServer(client_p)) {
        if (hideit < 2)
            sendto_realops_snomask(SNO_GENERAL, hideit ? L_ADMIN : (is_remote_connect(client_p) ? L_NETWIDE : L_ALL),
                                   "ERROR :from %s -- %s",
                                   client_p->name, para);
        if (hideit > 0)
            sendto_realops_snomask(SNO_GENERAL, (hideit == 1 ? L_OPER : L_ALL) | (is_remote_connect(client_p) ? L_NETWIDE : L_ALL),
                                   "ERROR :from %s -- <hidden>",
                                   client_p->name);
    }

    exit_client(client_p, source_p, source_p, "ERROR");

    return 0;
}

static int
ms_error(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    const char *para;
    int hideit = ConfigFileEntry.hide_error_messages;

    para = (parc > 1 && *parv[1] != '\0') ? parv[1] : "<>";

    ilog(L_SERVER, "Received ERROR message from %s: %s",
         log_client_name(source_p, SHOW_IP), para);

    if(is_safe_error(para))
        hideit = 0;
    if(hideit == 2)
        return 0;

    if(client_p == source_p) {
        sendto_realops_snomask(SNO_GENERAL, hideit ? L_ADMIN : L_ALL, "ERROR :from %s -- %s",
                               client_p->name, para);
    } else {
        sendto_realops_snomask(SNO_GENERAL, hideit ? L_ADMIN : L_ALL, "ERROR :from %s via %s -- %s",
                               source_p->name, client_p->name, para);
    }

    return 0;
}
