tools.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 21 Misc Functions */
10 
11 #include "squid.h"
12 #include "Debug.h"
13 #include "ip/Address.h"
14 #include "ip/tools.h"
15 
16 #if HAVE_UNISTD_H
17 #include <unistd.h>
18 #endif
19 #if HAVE_SYS_SOCKET_H
20 #include <sys/socket.h>
21 #endif
22 #if HAVE_NETINET_IN_H
23 #include <netinet/in.h>
24 #endif
25 #if HAVE_NETINET_IN6_H
26 #include <netinet/in6.h>
27 #endif
28 
30 
31 void
33 {
34  // check for usable IPv6 sockets
35  int s = socket(PF_INET6, SOCK_STREAM, 0);
36  if (s < 0) {
37  debugs(3, 2, "IPv6 not supported on this machine. Auto-Disabled.");
39  return;
40  }
41 
42  // Test for v4-mapping capability
43  // (AKA. the operating system supports RFC 3493 section 5.3)
44 #if defined(IPV6_V6ONLY)
45  int tos = 0;
46  if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, (char *) &tos, sizeof(int)) == 0) {
47  debugs(3, 2, "Detected IPv6 hybrid or v4-mapping stack...");
49  } else {
50  debugs(3, 2, "Detected split IPv4 and IPv6 stacks ...");
52  }
53 #else
54  // compliance here means they at least supply the option for compilers building code
55  // even if possibly to return hard-coded -1 on use.
56  debugs(3, 2, "Missing RFC 3493 compliance - attempting split IPv4 and IPv6 stacks ...");
58 #endif
59 
60  // Test for IPv6 loopback/localhost address binding
61  Ip::Address ip;
62  ip.setLocalhost();
63  if (ip.isIPv6()) { // paranoid; always succeeds if we got this far
64  struct sockaddr_in6 sin;
65  ip.getSockAddr(sin);
66  if (bind(s, reinterpret_cast<struct sockaddr *>(&sin), sizeof(sin)) != 0) {
67  debugs(3, DBG_CRITICAL, "WARNING: BCP 177 violation. Detected non-functional IPv6 loopback.");
69  } else {
70  debugs(3, 2, "Detected functional IPv6 loopback ...");
71  }
72  }
73 
74  close(s);
75 
76 #if USE_IPV6
77  debugs(3, 2, "IPv6 transport " << (EnableIpv6?"Enabled":"Disabled"));
78 #else
79  debugs(3, 2, "IPv6 transport " << (EnableIpv6?"Available":"Disabled"));
80  if (EnableIpv6 != IPV6_OFF) {
81  debugs(3, DBG_CRITICAL, "WARNING: BCP 177 violation. IPv6 transport forced OFF by build parameters.");
83  }
84 #endif
85 }
86 
void setLocalhost()
Definition: Address.cc:255
#define DBG_CRITICAL
Definition: Debug.h:45
#define debugs(SECTION, LEVEL, CONTENT)
Definition: Debug.h:124
bool isIPv6() const
Definition: Address.cc:164
void ProbeTransport(void)
Probe to discover IPv6 capabilities.
#define IPV6_OFF
Definition: tools.h:19
int EnableIpv6
Whether IPv6 is supported and type of support.
Definition: tools.h:25
void getSockAddr(struct sockaddr_storage &addr, const int family) const
Definition: Address.cc:934
#define IPV6_SPECIAL_V4MAPPING
Definition: tools.h:21
#define IPV6_SPECIAL_SPLITSTACK
Definition: tools.h:22

 

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