-/* Dealing with host names.
- Copyright (C) 1995, 1996, 1997, 2000 Free Software Foundation, Inc.
+/* Host name resolution and matching.
+ Copyright (C) 1995, 1996, 1997, 2000, 2001 Free Software Foundation, Inc.
This file is part of GNU Wget.
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <config.h>
+#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#else
# include <sys/socket.h>
# include <netinet/in.h>
-#ifndef __BEOS__
-# include <arpa/inet.h>
-#endif
+# ifndef __BEOS__
+# endif
# include <netdb.h>
#endif /* WINDOWS */
extern int errno;
#endif
-#define IP4_ADDRESS_LENGTH 4
+#ifndef h_errno
+# ifndef __CYGWIN__
+extern int h_errno;
+# endif
+#endif
+
+#ifdef INET6
+int ip_default_family = AF_INET6;
+#else
+int ip_default_family = AF_INET;
+#endif
/* Mapping between known hosts and to lists of their addresses. */
-struct hash_table *host_name_addresses_map;
+static struct hash_table *host_name_addresses_map;
\f
/* Lists of addresses. This should eventually be extended to handle
IPv6. */
struct address_list {
int count; /* number of adrresses */
- unsigned char *buffer; /* buffer which holds all of them. */
+ ip_address *addresses; /* pointer to the string of addresses */
- int refcount; /* so we know whether to free it or
- not. */
+ int faulty; /* number of addresses known not to work. */
+ int refcount; /* so we know whether to free it or not. */
};
-#define ADDR_LOCATION(al, index) ((al)->buffer + index * IP4_ADDRESS_LENGTH)
-
-/* Return the number of addresses in the list. */
+/* Get the bounds of the address list. */
-int
-address_list_count (struct address_list *al)
+void
+address_list_get_bounds (struct address_list *al, int *start, int *end)
{
- return al->count;
+ *start = al->faulty;
+ *end = al->count;
}
/* Copy address number INDEX to IP_STORE. */
void
-address_list_copy_one (struct address_list *al, int index,
- unsigned char *ip_store)
+address_list_copy_one (struct address_list *al, int index, ip_address *ip_store)
{
- memcpy (ip_store, ADDR_LOCATION (al, index), IP4_ADDRESS_LENGTH);
+ assert (index >= al->faulty && index < al->count && ip_store!=NULL );
+ memcpy (ip_store, al->addresses + index, sizeof (ip_address));
}
/* Check whether two address lists have all their IPs in common. */
return 1;
if (al1->count != al2->count)
return 0;
- return 0 == memcmp (al1->buffer, al2->buffer,
- al1->count * IP4_ADDRESS_LENGTH);
+ return 0 == memcmp (al1->addresses, al2->addresses,
+ al1->count * sizeof (ip_address));
}
+/* Mark the INDEXth element of AL as faulty, so that the next time
+ this address list is used, the faulty element will be skipped. */
+
+void
+address_list_set_faulty (struct address_list *al, int index)
+{
+ /* We assume that the address list is traversed in order, so that a
+ "faulty" attempt is always preceded with all-faulty addresses,
+ and this is how Wget uses it. */
+ assert (index == al->faulty);
+
+ ++al->faulty;
+ if (al->faulty >= al->count)
+ /* All addresses have been proven faulty. Since there's not much
+ sense in returning the user an empty address list the next
+ time, we'll rather make them all clean, so that they can be
+ retried anew. */
+ al->faulty = 0;
+}
+
+#ifdef INET6
+/**
+ * address_list_from_addrinfo
+ *
+ * This function transform an addrinfo links list in and address_list.
+ *
+ * Input:
+ * addrinfo* Linkt list of addrinfo
+ *
+ * Output:
+ * address_list* New allocated address_list
+ */
+static struct address_list *
+address_list_from_addrinfo (struct addrinfo *ai)
+{
+ struct address_list *al;
+ struct addrinfo *ai_head = ai;
+ int cnt = 0;
+ int i;
+
+ for (ai = ai_head; ai; ai = ai->ai_next)
+ if (ai->ai_family == AF_INET || ai->ai_family == AF_INET6)
+ ++cnt;
+ if (cnt == 0)
+ return NULL;
+
+ al = xmalloc (sizeof (struct address_list));
+ al->addresses = xmalloc (cnt * sizeof (ip_address));
+ al->count = cnt;
+ al->faulty = 0;
+ al->refcount = 1;
+
+ for (i = 0, ai = ai_head; ai; ai = ai->ai_next)
+ if (ai->ai_family == AF_INET6)
+ {
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)ai->ai_addr;
+ memcpy (al->addresses + i, &sin6->sin6_addr, 16);
+ ++i;
+ }
+ else if (ai->ai_family == AF_INET)
+ {
+ struct sockaddr_in *sin = (struct sockaddr_in *)ai->ai_addr;
+ map_ipv4_to_ip ((ip4_address *)&sin->sin_addr, al->addresses + i);
+ ++i;
+ }
+ assert (i == cnt);
+ return al;
+}
+#else
/* Create an address_list out of a NULL-terminated list of addresses,
as returned by gethostbyname. */
-
static struct address_list *
address_list_new (char **h_addr_list)
{
while (h_addr_list[count])
++count;
assert (count > 0);
- al->count = count;
- al->buffer = xmalloc (count * IP4_ADDRESS_LENGTH);
- al->refcount = 1;
+ al->count = count;
+ al->faulty = 0;
+ al->addresses = xmalloc (count * sizeof (ip_address));
+ al->refcount = 1;
for (i = 0; i < count; i++)
- memcpy (ADDR_LOCATION (al, i), h_addr_list[i], IP4_ADDRESS_LENGTH);
+ memcpy (al->addresses + i, h_addr_list[i], sizeof (ip_address));
+
+ return al;
+}
+#endif
+
+/* Like address_list_new, but initialized with only one address. */
+
+static struct address_list *
+address_list_new_one (ip_address *addr)
+{
+ struct address_list *al = xmalloc (sizeof (struct address_list));
+ al->count = 1;
+ al->faulty = 0;
+ al->addresses = xmalloc (sizeof (ip_address));
+ al->refcount = 1;
+ memcpy (al->addresses, addr, sizeof (ip_address));
return al;
}
static void
address_list_delete (struct address_list *al)
{
- xfree (al->buffer);
+ xfree (al->addresses);
xfree (al);
}
}
}
\f
-/* The same as inet_ntoa, but without the need for a cast, or for
- #including the netinet stuff. */
+/**
+ * wget_sockaddr_set_address
+ *
+ * This function takes an wget_sockaddr and fill in the protocol type,
+ * the port number and the address, there NULL in address means wildcard.
+ * Unsuported adress family will abort the whole programm.
+ *
+ * Input:
+ * wget_sockaddr* The space to be filled
+ * int The wished protocol
+ * unsigned short The port
+ * const ip_address The Binary IP adress
+ *
+ * Return:
+ * - Only modify 1. param
+ */
+void
+wget_sockaddr_set_address (wget_sockaddr *sa,
+ int ip_family, unsigned short port, ip_address *addr)
+{
+ if (ip_family == AF_INET)
+ {
+ sa->sin.sin_family = ip_family;
+ sa->sin.sin_port = htons (port);
+ if (addr == NULL)
+ memset ((unsigned char*)&sa->sin.sin_addr, 0, sizeof(ip_address));
+ else
+ memcpy ((unsigned char*)&sa->sin.sin_addr, addr, sizeof(ip_address));
+ return;
+ }
+#ifdef INET6
+ if (ip_family == AF_INET6)
+ {
+ sa->sin6.sin6_family = ip_family;
+ sa->sin6.sin6_port = htons (port);
+ if (addr == NULL)
+ memset (&sa->sin6.sin6_addr, 0 , sizeof(ip_address));
+ else
+ memcpy (&sa->sin6.sin6_addr, addr, sizeof(ip_address));
+ return;
+ }
+#endif
+ abort();
+}
+
+/**
+ * wget_sockaddr_set_port
+ *
+ * This funtion only fill the port of the socket information.
+ * If the protocol is not supported nothing is done.
+ * Unsuported adress family will abort the whole programm.
+ *
+ * Require:
+ * that the IP-Protocol already is set.
+ *
+ * Input:
+ * wget_sockaddr* The space there port should be entered
+ * unsigned int The port that should be entered in host order
+ *
+ * Return:
+ * - Only modify 1. param
+ */
+void
+wget_sockaddr_set_port (wget_sockaddr *sa, unsigned short port)
+{
+ if (sa->sa.sa_family == AF_INET)
+ {
+ sa->sin.sin_port = htons (port);
+ return;
+ }
+#ifdef INET6
+ if (sa->sa.sa_family == AF_INET6)
+ {
+ sa->sin6.sin6_port = htons (port);
+ return;
+ }
+#endif
+ abort();
+}
+
+/**
+ * wget_sockaddr_get_addr
+ *
+ * This function return the adress from an sockaddr as byte string.
+ * Unsuported adress family will abort the whole programm.
+ *
+ * Require:
+ * that the IP-Protocol already is set.
+ *
+ * Input:
+ * wget_sockaddr* Socket Information
+ *
+ * Output:
+ * unsigned char * IP address as byte string.
+ */
+void *
+wget_sockaddr_get_addr (wget_sockaddr *sa)
+{
+ if (sa->sa.sa_family == AF_INET)
+ return &sa->sin.sin_addr;
+#ifdef INET6
+ if (sa->sa.sa_family == AF_INET6)
+ return &sa->sin6.sin6_addr;
+#endif
+ abort();
+ /* unreached */
+ return NULL;
+}
+
+/**
+ * wget_sockaddr_get_port
+ *
+ * This function only return the port from the input structure
+ * Unsuported adress family will abort the whole programm.
+ *
+ * Require:
+ * that the IP-Protocol already is set.
+ *
+ * Input:
+ * wget_sockaddr* Information where to get the port
+ *
+ * Output:
+ * unsigned short Port Number in host order.
+ */
+unsigned short
+wget_sockaddr_get_port (const wget_sockaddr *sa)
+{
+ if (sa->sa.sa_family == AF_INET)
+ return htons (sa->sin.sin_port);
+#ifdef INET6
+ if (sa->sa.sa_family == AF_INET6)
+ return htons (sa->sin6.sin6_port);
+#endif
+ abort();
+ /* do not complain about return nothing */
+ return -1;
+}
+
+/**
+ * sockaddr_len
+ *
+ * This function return the length of the sockaddr corresponding to
+ * the acutall prefered protocol for (bind, connect etc...)
+ * Unsuported adress family will abort the whole programm.
+ *
+ * Require:
+ * that the IP-Protocol already is set.
+ *
+ * Input:
+ * - Public IP-Family Information
+ *
+ * Output:
+ * int structure length for socket options
+ */
+int
+sockaddr_len ()
+{
+ if (ip_default_family == AF_INET)
+ return sizeof (struct sockaddr_in);
+#ifdef INET6
+ if (ip_default_family == AF_INET6)
+ return sizeof (struct sockaddr_in6);
+#endif
+ abort();
+ /* do not complain about return nothing */
+ return 0;
+}
+
+/**
+ * Map an IPv4 adress to the internal adress format.
+ */
+void
+map_ipv4_to_ip (ip4_address *ipv4, ip_address *ip)
+{
+#ifdef INET6
+ static unsigned char ipv64[12] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff};
+ memcpy ((char *)ip + 12, ipv4 , 4);
+ memcpy ((char *)ip + 0, ipv64, 12);
+#else
+ if ((char *)ip != (char *)ipv4)
+ memcpy (ip, ipv4, 4);
+#endif
+}
+
+/* Detect whether an IP adress represents an IPv4 address and, if so,
+ copy it to IPV4. 0 is returned on failure.
+ This operation always succeeds when Wget is compiled without IPv6.
+ If IPV4 is NULL, don't copy, just detect. */
+
+int
+map_ip_to_ipv4 (ip_address *ip, ip4_address *ipv4)
+{
+#ifdef INET6
+ static unsigned char ipv64[12] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff};
+ if (0 != memcmp (ip, ipv64, 12))
+ return 0;
+ if (ipv4)
+ memcpy (ipv4, (char *)ip + 12, 4);
+#else
+ if (ipv4)
+ memcpy (ipv4, (char *)ip, 4);
+#endif
+ return 1;
+}
+\f
+/* Pretty-print ADDR. When compiled without IPv6, this is the same as
+ inet_ntoa. With IPv6, it either prints an IPv6 address or an IPv4
+ address. */
char *
-pretty_print_address (const unsigned char *addr)
+pretty_print_address (ip_address *addr)
{
+#ifdef INET6
+ ip4_address addr4;
+ static char buf[128];
+
+ if (map_ip_to_ipv4 (addr, &addr4))
+ return inet_ntoa (*(struct in_addr *)&addr4);
+
+ if (!inet_ntop (AF_INET6, addr, buf, sizeof (buf)))
+ return "<unknown>";
+ return buf;
+#endif
return inet_ntoa (*(struct in_addr *)addr);
}
int i;
debug_logprintf ("Caching %s =>", host);
for (i = 0; i < al->count; i++)
- debug_logprintf (" %s",
- pretty_print_address (ADDR_LOCATION (al, i)));
+ debug_logprintf (" %s", pretty_print_address (al->addresses + i));
debug_logprintf ("\n");
}
#endif
lookup_host (const char *host, int silent)
{
struct address_list *al = NULL;
- unsigned long addr;
- struct hostent *hptr;
+ unsigned long addr_ipv4; /* #### use a 32-bit type here. */
+ ip_address addr;
- /* If the address is of the form d.d.d.d, no further lookup is
- needed. */
- addr = (unsigned long)inet_addr (host);
- if ((int)addr != -1)
- {
- unsigned char tmpstore[IP4_ADDRESS_LENGTH];
- char *lst[] = { tmpstore, NULL };
+ /* First, try to check whether the address is already a numeric
+ address. */
+#ifdef INET6
+ if (inet_pton (AF_INET6, host, &addr) > 0)
+ return address_list_new_one (&addr);
+#endif
+
+ addr_ipv4 = (unsigned long)inet_addr (host);
+ if ((int)addr_ipv4 != -1)
+ {
/* ADDR is defined to be in network byte order, which is what
this returns, so we can just copy it to STORE_IP. However,
on big endian 64-bit architectures the value will be stored
in the *last*, not first four bytes. OFFSET makes sure that
we copy the correct four bytes. */
- int offset;
+ int offset = 0;
#ifdef WORDS_BIGENDIAN
- offset = sizeof (unsigned long) - IP4_ADDRESS_LENGTH;
-#else
- offset = 0;
+ offset = sizeof (unsigned long) - sizeof (ip_address);
#endif
- memcpy (tmpstore, (char *)&addr + offset, IP4_ADDRESS_LENGTH);
- return address_list_new (lst);
+ map_ipv4_to_ip ((ip4_address *)((char *)&addr_ipv4 + offset), &addr);
+ return address_list_new_one (&addr);
}
- /* By now we know that the host name we got is not of the form
- d.d.d.d. Try to find it in our cache of host names. */
if (host_name_addresses_map)
- al = hash_table_get (host_name_addresses_map, host);
-
- if (al)
{
- DEBUGP (("Found %s in host_name_addresses_map (%p)\n", host, al));
- ++al->refcount;
- return al;
+ al = hash_table_get (host_name_addresses_map, host);
+
+ if (al)
+ {
+ DEBUGP (("Found %s in host_name_addresses_map (%p)\n", host, al));
+ ++al->refcount;
+ return al;
+ }
}
if (!silent)
logprintf (LOG_VERBOSE, _("Resolving %s... "), host);
- /* Look up the host using gethostbyname(). Note that we use
- gethostbyname() rather than ngethostbyname(), because we already
- know that the address is not numerical. */
- hptr = gethostbyname (host);
- if (!hptr)
- {
- if (!silent)
- logprintf (LOG_VERBOSE, _("failed: %s.\n"), herrmsg (h_errno));
- return NULL;
- }
+#ifdef INET6
+ {
+ struct addrinfo hints, *ai;
+ int err;
+
+ memset (&hints, 0, sizeof (hints));
+ hints.ai_family = PF_UNSPEC;
+ hints.ai_socktype = SOCK_STREAM;
+ err = getaddrinfo (host, NULL, &hints, &ai);
+
+ if (err != 0 || ai == NULL)
+ {
+ if (!silent)
+ logprintf (LOG_VERBOSE, _("failed: %s.\n"), gai_strerror (err));
+ return NULL;
+ }
+ al = address_list_from_addrinfo (ai);
+ freeaddrinfo (ai);
+ }
+#else
+ {
+ struct hostent *hptr = gethostbyname (host);
+ if (!hptr)
+ {
+ if (!silent)
+ logprintf (LOG_VERBOSE, _("failed: %s.\n"), herrmsg (h_errno));
+ return NULL;
+ }
+ /* Do all systems have h_addr_list, or is it a newer thing? If
+ the latter, use address_list_new_one. */
+ al = address_list_new (hptr->h_addr_list);
+ }
+#endif
if (!silent)
logprintf (LOG_VERBOSE, _("done.\n"));
- al = address_list_new (hptr->h_addr_list);
-
/* Cache the lookup information. */
cache_host_lookup (host, al);
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