src/eui/Eui64.cc

   1 /*
   2  * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 /* DEBUG: section 89    EUI-64 Handling */
  10
  11 #include "squid.h"
  12
  13 #if USE_SQUID_EUI
  14
  15 #include "compat/eui64_aton.h"
  16 #include "debug/Stream.h"
  17 #include "eui/Eui64.h"
  18 #include "globals.h"
  19 #include "ip/Address.h"
  20
  21 bool
  22 Eui::Eui64::decode(const char *asc)
  23 {
  24     if (eui64_aton(asc, (struct eui64 *)eui) != 0) {
  25         debugs(28, 4, "id=" << (void*)this << " decode fail on " << asc);
  26         return false;
  27     }
  28
  29     debugs(28, 4, "id=" << (void*)this << " ATON decoded " << asc);
  30     return true;
  31 }
  32
  33 bool
  34 Eui::Eui64::encode(char *buf, const int len) const
  35 {
  36     if (len < SZ_EUI64_BUF) return false;
  37
  38     snprintf(buf, len, "%02x-%02x-%02x-%02x-%02x-%02x-%02x-%02x",
  39              eui[0], eui[1], eui[2], eui[3],
  40              eui[4], eui[5], eui[6], eui[7]);
  41     debugs(28, 4, "id=" << (void*)this << " encoded " << buf);
  42     return true;
  43 }
  44
  45 // return binary representation of the EUI
  46 bool
  47 Eui::Eui64::lookup(const Ip::Address &c)
  48 {
  49     /* try to short-circuit slow OS lookups by using SLAAC data */
  50     if (lookupSlaac(c))
  51         return true;
  52
  53     // find EUI-64 some other way. NDP table lookup?
  54     return lookupNdp(c);
  55 }
  56
  57 bool
  58 Eui::Eui64::lookupSlaac(const Ip::Address &c)
  59 {
  60     /* RFC 4291 Link-Local unicast addresses which contain SLAAC - usually trustable. */
  61     if (c.isSiteLocal6() && c.isSiteLocalAuto()) {
  62
  63         // strip the final 64 bits of the address...
  64         struct in6_addr tmp;
  65         c.getInAddr(tmp);
  66         memcpy(eui, &(tmp.s6_addr[8]), SZ_EUI64_BUF);
  67         debugs(28, 4, "id=" << (void*)this << " SLAAC decoded " << c);
  68         return true;
  69     }
  70
  71     debugs(28, 4, "id=" << (void*)this << " SLAAC fail on " << c << " SL-6="
  72            << (c.isSiteLocal6()?'T':'F') << " AAC-6=" << (c.isSiteLocalAuto()?'T':'F'));
  73     return false;
  74 }
  75
  76 // return binary representation of the EUI
  77 bool
  78 Eui::Eui64::lookupNdp(const Ip::Address &/*c*/)
  79 {
  80 #if 0 /* no actual lookup coded yet */
  81
  82     /* no OS yet supported for NDP protocol lookup */
  83     debugs(28, DBG_CRITICAL, "ERROR: ARP / MAC / EUI-* operations not supported on this operating system.");
  84
  85     /*
  86      * Address was not found on any interface
  87      */
  88     debugs(28, 3, "id=" << (void*)this << ' ' << c << " NOT found");
  89 #endif /* 0 */
  90
  91     clear();
  92     return false;
  93 }
  94
  95 #endif /* USE_SQUID_EUI */
  96