Eui64.cc
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1 /*
2  * Copyright (C) 1996-2019 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.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
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
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
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 
int eui64_aton(const char *a, struct eui64 *e)
Definition: eui64_aton.c:94
void clear()
Definition: Eui64.h:52
bool getInAddr(struct in_addr &) const
Definition: Address.cc:1030
bool isSiteLocalAuto() const
Definition: Address.cc:277
#define DBG_CRITICAL
Definition: Debug.h:45
unsigned char eui[SZ_EUI64_BUF]
Definition: Eui64.h:85
bool lookupSlaac(const Ip::Address &c)
Definition: Eui64.cc:58
bool lookupNdp(const Ip::Address &c)
Definition: Eui64.cc:78
#define debugs(SECTION, LEVEL, CONTENT)
Definition: Debug.h:124
bool encode(char *buf, const int len) const
Definition: Eui64.cc:34
bool isSiteLocal6() const
Definition: Address.cc:267
int unsigned int const char *desc STUB void int len
Definition: stub_fd.cc:20
void const char * buf
Definition: stub_helper.cc:16
#define SZ_EUI64_BUF
Definition: Eui64.h:31
bool decode(const char *asc)
Definition: Eui64.cc:22
bool lookup(const Ip::Address &c)
Definition: Eui64.cc:47

 

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