#include <stdio.h>
#include <stdlib.h>
-#ifdef HAVE_STRING_H
-# include <string.h>
-#else
-# include <strings.h>
-#endif
+#include <string.h>
#include <assert.h>
-#include <sys/types.h>
-#ifdef WINDOWS
-# include <winsock.h>
-# define SET_H_ERRNO(err) WSASetLastError (err)
-#else
+#ifndef WINDOWS
# include <sys/socket.h>
# include <netinet/in.h>
# ifndef __BEOS__
# endif
# include <netdb.h>
# define SET_H_ERRNO(err) ((void)(h_errno = (err)))
+#else /* WINDOWS */
+# define SET_H_ERRNO(err) WSASetLastError (err)
#endif /* WINDOWS */
-#ifndef NO_ADDRESS
-# define NO_ADDRESS NO_DATA
-#endif
-
#include <errno.h>
#include "wget.h"
#include "hash.h"
#include "connect.h" /* for socket_has_inet6 */
-#ifndef errno
-extern int errno;
-#endif
-
-#ifndef h_errno
-# ifndef __CYGWIN__
-extern int h_errno;
-# endif
+#ifndef NO_ADDRESS
+# define NO_ADDRESS NO_DATA
#endif
/* Lists of IP addresses that result from running DNS queries. See
#endif /* ENABLE_IPV6 */
default:
abort ();
- return 0;
}
}
return al;
}
+#define IS_IPV4(addr) (((const ip_address *) addr)->type == IPV4_ADDRESS)
+
+/* Compare two IP addresses by type, giving preference to the IPv4
+ address (sorting it first). In other words, return -1 if ADDR1 is
+ IPv4 and ADDR2 is IPv6, +1 if ADDR1 is IPv6 and ADDR2 is IPv4, and
+ 0 otherwise.
+
+ This is intended to be used as the comparator arg to a qsort-like
+ sorting function, which is why it accepts generic pointers. */
+
+static int
+cmp_prefer_ipv4 (const void *addr1, const void *addr2)
+{
+ return !IS_IPV4 (addr1) - !IS_IPV4 (addr2);
+}
+
+#define IS_IPV6(addr) (((const ip_address *) addr)->type == IPV6_ADDRESS)
+
+/* Like the above, but give preference to the IPv6 address. */
+
+static int
+cmp_prefer_ipv6 (const void *addr1, const void *addr2)
+{
+ return !IS_IPV6 (addr1) - !IS_IPV6 (addr2);
+}
+
#else /* not ENABLE_IPV6 */
/* Create an address_list from a NULL-terminated vector of IPv4
address_list_release (struct address_list *al)
{
--al->refcount;
- DEBUGP (("Releasing %p (new refcount %d).\n", al, al->refcount));
+ DEBUGP (("Releasing 0x%0*lx (new refcount %d).\n", PTR_FORMAT (al),
+ al->refcount));
if (al->refcount <= 0)
{
- DEBUGP (("Deleting unused %p.\n", al));
+ DEBUGP (("Deleting unused 0x%0*lx.\n", PTR_FORMAT (al)));
address_list_delete (al);
}
}
#endif
}
abort ();
- return NULL;
}
/* The following two functions were adapted from glibc. */
int
is_valid_ipv6_address (const char *str, const char *end)
{
+ /* Use lower-case for these to avoid clash with system headers. */
enum {
- NS_INADDRSZ = 4,
- NS_IN6ADDRSZ = 16,
- NS_INT16SZ = 2
+ ns_inaddrsz = 4,
+ ns_in6addrsz = 16,
+ ns_int16sz = 2
};
const char *curtok;
}
else if (str == end)
return 0;
- if (tp > NS_IN6ADDRSZ - NS_INT16SZ)
+ if (tp > ns_in6addrsz - ns_int16sz)
return 0;
- tp += NS_INT16SZ;
+ tp += ns_int16sz;
saw_xdigit = 0;
val = 0;
continue;
}
/* if ch is a dot ... */
- if (ch == '.' && (tp <= NS_IN6ADDRSZ - NS_INADDRSZ)
+ if (ch == '.' && (tp <= ns_in6addrsz - ns_inaddrsz)
&& is_valid_ipv4_address (curtok, end) == 1)
{
- tp += NS_INADDRSZ;
+ tp += ns_inaddrsz;
saw_xdigit = 0;
break;
}
if (saw_xdigit == 1)
{
- if (tp > NS_IN6ADDRSZ - NS_INT16SZ)
+ if (tp > ns_in6addrsz - ns_int16sz)
return 0;
- tp += NS_INT16SZ;
+ tp += ns_int16sz;
}
if (colonp != NULL)
{
- if (tp == NS_IN6ADDRSZ)
+ if (tp == ns_in6addrsz)
return 0;
- tp = NS_IN6ADDRSZ;
+ tp = ns_in6addrsz;
}
- if (tp != NS_IN6ADDRSZ)
+ if (tp != ns_in6addrsz)
return 0;
return 1;
}
}
\f
-/* Look up HOST in DNS and return a list of IP addresses. The
- addresses in the list are in the same order in which
- gethostbyname/getaddrinfo returned them.
+/* Look up HOST in DNS and return a list of IP addresses.
This function caches its result so that, if the same host is passed
the second time, the addresses are returned without DNS lookup.
(Use LH_REFRESH to force lookup, or set opt.dns_cache to 0 to
globally disable caching.)
+ The order of the returned addresses is affected by the setting of
+ opt.prefer_family: if it is set to prefer_ipv4, IPv4 addresses are
+ placed at the beginning; if it is prefer_ipv6, IPv6 ones are placed
+ at the beginning; otherwise, the order is left intact. The
+ relative order of addresses with the same family is left
+ undisturbed in either case.
+
FLAGS can be a combination of:
LH_SILENT - don't print the "resolving ... done" messages.
LH_BIND - resolve addresses for use with bind, which under
/* No luck with the cache; resolve HOST. */
if (!silent && !numeric_address)
- logprintf (LOG_VERBOSE, _("Resolving %s... "), host);
+ logprintf (LOG_VERBOSE, _("Resolving %s... "), escnonprint (host));
#ifdef ENABLE_IPV6
{
else if (opt.ipv6_only)
hints.ai_family = AF_INET6;
else
- {
+ /* We tried using AI_ADDRCONFIG, but removed it because: it
+ misinterprets IPv6 loopbacks, it is broken on AIX 5.1, and
+ it's unneeded since we sort the addresses anyway. */
hints.ai_family = AF_UNSPEC;
-#ifdef AI_ADDRCONFIG
- hints.ai_flags |= AI_ADDRCONFIG;
-#else
- /* On systems without AI_ADDRCONFIG, emulate it by manually
- checking whether the system supports IPv6 sockets. */
- if (!socket_has_inet6 ())
- hints.ai_family = AF_INET;
-#endif
- }
+
if (flags & LH_BIND)
hints.ai_flags |= AI_PASSIVE;
_("failed: No IPv4/IPv6 addresses for host.\n"));
return NULL;
}
+
+ /* Reorder addresses so that IPv4 ones (or IPv6 ones, as per
+ --prefer-family) come first. Sorting is stable so the order of
+ the addresses with the same family is undisturbed. */
+ if (al->count > 1 && opt.prefer_family != prefer_none)
+ stable_sort (al->addresses, al->count, sizeof (ip_address),
+ opt.prefer_family == prefer_ipv4
+ ? cmp_prefer_ipv4 : cmp_prefer_ipv6);
}
#else /* not ENABLE_IPV6 */
{
projects / wget / blobdiff