tools.cc
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1 /*
2  * Copyright (C) 1996-2017 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/tools.h"
14 
15 #if HAVE_UNISTD_H
16 #include <unistd.h>
17 #endif
18 #if HAVE_SYS_SOCKET_H
19 #include <sys/socket.h>
20 #endif
21 #if HAVE_NETINET_IN_H
22 #include <netinet/in.h>
23 #endif
24 #if HAVE_NETINET_IN6_H
25 #include <netinet/in6.h>
26 #endif
27 
29 
30 void
32 {
33  // check for usable IPv6 sockets
34  int s = socket(PF_INET6, SOCK_STREAM, 0);
35  if (s < 0) {
36  debugs(3, 2, "IPv6 not supported on this machine. Auto-Disabled.");
38  return;
39  }
40 
41  // Test for v4-mapping capability
42  // (AKA. the operating system supports RFC 3493 section 5.3)
43 #if defined(IPV6_V6ONLY)
44  int tos = 0;
45  if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, (char *) &tos, sizeof(int)) == 0) {
46  debugs(3, 2, "Detected IPv6 hybrid or v4-mapping stack...");
48  } else {
49  debugs(3, 2, "Detected split IPv4 and IPv6 stacks ...");
51  }
52 #else
53  // compliance here means they at least supply the option for compilers building code
54  // even if possibly to return hard-coded -1 on use.
55  debugs(3, 2, "Missing RFC 3493 compliance - attempting split IPv4 and IPv6 stacks ...");
57 #endif
58  // TODO: attempt to use the socket to connect somewhere ?
59  // needs to be safe to contact and with guaranteed working IPv6 at the other end.
60  close(s);
61 
62 #if USE_IPV6
63  debugs(3, 2, "IPv6 transport " << (EnableIpv6?"Enabled":"Disabled"));
64 #else
65  debugs(3, 2, "IPv6 transport " << (EnableIpv6?"Available":"Disabled"));
66  if (EnableIpv6 != IPV6_OFF) {
67  debugs(3, DBG_CRITICAL, "WARNING: BCP 177 violation. IPv6 transport forced OFF by build parameters.");
69  }
70 #endif
71 }
72 
#define DBG_CRITICAL
Definition: Debug.h:44
#define debugs(SECTION, LEVEL, CONTENT)
Definition: Debug.h:123
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
#define IPV6_SPECIAL_V4MAPPING
Definition: tools.h:21
#define IPV6_SPECIAL_SPLITSTACK
Definition: tools.h:22

 

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