src/eui/Eui64.cc

   1 /*
   2  * DEBUG: section 89    EUI-64 Handling
   3  * AUTHOR: Amos Jeffries
   4  *
   5  * Copyright (c) 2009, Amos Jeffries <squid3@treenet.co.nz>
   6  */
   7
   8 #include "squid.h"
   9
  10 #if USE_SQUID_EUI
  11
  12 #include "compat/eui64_aton.h"
  13 #include "Debug.h"
  14 #include "eui/Eui64.h"
  15 #include "globals.h"
  16 #include "ip/Address.h"
  17
  18 bool
  19 Eui::Eui64::decode(const char *asc)
  20 {
  21     if (eui64_aton(asc, (struct eui64 *)eui) != 0) {
  22        debugs(28, 4, "id=" << (void*)this << " decode fail on " << asc);
  23        return false;
  24     }
  25
  26     debugs(28, 4, "id=" << (void*)this << " ATON decoded " << asc);
  27     return true;
  28 }
  29
  30 bool
  31 Eui::Eui64::encode(char *buf, const int len)
  32 {
  33     if (len < SZ_EUI64_BUF) return false;
  34
  35     snprintf(buf, len, "%02x-%02x-%02x-%02x-%02x-%02x-%02x-%02x",
  36              eui[0], eui[1], eui[2], eui[3],
  37              eui[4], eui[5], eui[6], eui[7]);
  38     debugs(28, 4, "id=" << (void*)this << " encoded " << buf);
  39     return true;
  40 }
  41
  42 // return binary representation of the EUI
  43 bool
  44 Eui::Eui64::lookup(const Ip::Address &c)
  45 {
  46     /* try to short-circuit slow OS lookups by using SLAAC data */
  47     if (lookupSlaac(c))
  48         return true;
  49
  50     // find EUI-64 some other way. NDP table lookup?
  51     return lookupNdp(c);
  52 }
  53
  54 bool
  55 Eui::Eui64::lookupSlaac(const Ip::Address &c)
  56 {
  57     /* RFC 4291 Link-Local unicast addresses which contain SLAAC - usually trustable. */
  58     if (c.isSiteLocal6() && c.isSiteLocalAuto()) {
  59
  60         // strip the final 64 bits of the address...
  61         struct in6_addr tmp;
  62         c.getInAddr(tmp);
  63         memcpy(eui, &(tmp.s6_addr[8]), SZ_EUI64_BUF);
  64         debugs(28, 4, "id=" << (void*)this << " SLAAC decoded " << c);
  65         return true;
  66     }
  67
  68     debugs(28, 4, "id=" << (void*)this << " SLAAC fail on " << c << " SL-6="
  69            << (c.isSiteLocal6()?'T':'F') << " AAC-6=" << (c.isSiteLocalAuto()?'T':'F'));
  70     return false;
  71 }
  72
  73 // return binary representation of the EUI
  74 bool
  75 Eui::Eui64::lookupNdp(const Ip::Address &c)
  76 {
  77 #if 0 /* no actual lookup coded yet */
  78
  79     /* no OS yet supported for NDP protocol lookup */
  80     debugs(28, DBG_CRITICAL, "ERROR: ARP / MAC / EUI-* operations not supported on this operating system.");
  81
  82     /*
  83      * Address was not found on any interface
  84      */
  85     debugs(28, 3, "id=" << (void*)this << ' ' << c << " NOT found");
  86 #endif /* 0 */
  87
  88     clear();
  89     return false;
  90 }
  91
  92 #endif /* USE_SQUID_EUI */