/*
 * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */

/* DEBUG: section 89    EUI-64 Handling */

#include "squid.h"

#if USE_SQUID_EUI

#include "compat/eui64_aton.h"
#include "debug/Stream.h"
#include "eui/Eui64.h"
#include "globals.h"
#include "ip/Address.h"

bool
Eui::Eui64::decode(const char *asc)
{
    if (eui64_aton(asc, (struct eui64 *)eui) != 0) {
        debugs(28, 4, "id=" << (void*)this << " decode fail on " << asc);
        return false;
    }

    debugs(28, 4, "id=" << (void*)this << " ATON decoded " << asc);
    return true;
}

bool
Eui::Eui64::encode(char *buf, const int len) const
{
    if (len < SZ_EUI64_BUF) return false;

    snprintf(buf, len, "%02x-%02x-%02x-%02x-%02x-%02x-%02x-%02x",
             eui[0], eui[1], eui[2], eui[3],
             eui[4], eui[5], eui[6], eui[7]);
    debugs(28, 4, "id=" << (void*)this << " encoded " << buf);
    return true;
}

// return binary representation of the EUI
bool
Eui::Eui64::lookup(const Ip::Address &c)
{
    /* try to short-circuit slow OS lookups by using SLAAC data */
    if (lookupSlaac(c))
        return true;

    // find EUI-64 some other way. NDP table lookup?
    return lookupNdp(c);
}

bool
Eui::Eui64::lookupSlaac(const Ip::Address &c)
{
    /* RFC 4291 Link-Local unicast addresses which contain SLAAC - usually trustable. */
    if (c.isSiteLocal6() && c.isSiteLocalAuto()) {

        // strip the final 64 bits of the address...
        struct in6_addr tmp;
        c.getInAddr(tmp);
        memcpy(eui, &(tmp.s6_addr[8]), SZ_EUI64_BUF);
        debugs(28, 4, "id=" << (void*)this << " SLAAC decoded " << c);
        return true;
    }

    debugs(28, 4, "id=" << (void*)this << " SLAAC fail on " << c << " SL-6="
           << (c.isSiteLocal6()?'T':'F') << " AAC-6=" << (c.isSiteLocalAuto()?'T':'F'));
    return false;
}

// return binary representation of the EUI
bool
Eui::Eui64::lookupNdp(const Ip::Address &/*c*/)
{
#if 0 /* no actual lookup coded yet */

    /* no OS yet supported for NDP protocol lookup */
    debugs(28, DBG_CRITICAL, "ERROR: ARP / MAC / EUI-* operations not supported on this operating system.");

    /*
     * Address was not found on any interface
     */
    debugs(28, 3, "id=" << (void*)this << ' ' << c << " NOT found");
#endif /* 0 */

    clear();
    return false;
}

#endif /* USE_SQUID_EUI */

