/* #### We should map to *lists* of IP addresses. */
struct hash_table *host_name_address_map;
+\f
+#if 0
-/* The following two tables are obsolete, since we no longer do host
- canonicalization. */
-
-/* Mapping between all known addresses (n.n.n.n) to their hosts. This
- is the inverse of host_name_address_map. These two tables share
- the strdup'ed strings. */
-struct hash_table *host_address_name_map;
-
-/* Mapping between auxilliary (slave) and master host names. */
-struct hash_table *host_slave_master_map;
+/* This function is no longer used. */
/* The same as gethostbyname, but supports internet addresses of the
form `N.N.N.N'. On some systems gethostbyname() knows how to do
hp = gethostbyname (name);
return hp;
}
+#endif
-/* Add host name HOST with the address ADDR_TEXT to the cache.
- Normally this means that the (HOST, ADDR_TEXT) pair will be to
- host_name_address_map and to host_address_name_map. (It is the
- caller's responsibility to make sure that HOST is not already in
- host_name_address_map.)
-
- If the ADDR_TEXT has already been seen and belongs to another host,
- HOST will be added to host_slave_master_map instead. */
+/* Add host name HOST with the address ADDR_TEXT to the cache. */
static void
add_host_to_cache (const char *host, const char *addr_text)
{
- char *canonical_name = hash_table_get (host_address_name_map, addr_text);
- if (canonical_name)
- {
- DEBUGP (("Mapping %s to %s in host_slave_master_map.\n",
- host, canonical_name));
- /* We've already dealt with that host under another name. */
- hash_table_put (host_slave_master_map,
- xstrdup_lower (host),
- xstrdup_lower (canonical_name));
- }
- else
- {
- /* This is really the first time we're dealing with that host. */
- char *h_copy = xstrdup_lower (host);
- char *a_copy = xstrdup (addr_text);
- DEBUGP (("Caching %s <-> %s\n", h_copy, a_copy));
- hash_table_put (host_name_address_map, h_copy, a_copy);
- hash_table_put (host_address_name_map, a_copy, h_copy);
- }
+ DEBUGP (("Caching %s => %s\n", host, addr_text));
+
+ if (!host_name_address_map)
+ host_name_address_map = make_nocase_string_hash_table (0);
+
+ hash_table_put (host_name_address_map,
+ xstrdup_lower (host), xstrdup (addr_text));
}
/* Store the address of HOSTNAME, internet-style (four octets in
Return 1 on successful finding of the hostname, 0 otherwise. */
int
-store_hostaddress (unsigned char *where, const char *hostname)
+lookup_host (const char *hostname, unsigned char *store_ip)
{
unsigned long addr;
- char *addr_text;
- char *canonical_name;
+ char *addr_text = NULL;
struct hostent *hptr;
struct in_addr in;
char *inet_s;
- /* If the address is of the form d.d.d.d, there will be no trouble
- with it. */
+ /* If the address is of the form d.d.d.d, no further lookup is
+ needed. */
addr = (unsigned long)inet_addr (hostname);
- /* If we have the numeric address, just store it. */
if ((int)addr != -1)
{
- /* ADDR is defined to be in network byte order, meaning the code
- works on little and big endian 32-bit architectures without
- change. On big endian 64-bit architectures we need to be
- careful to copy the correct four bytes. */
+ /* 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;
have_addr:
#ifdef WORDS_BIGENDIAN
#else
offset = 0;
#endif
- memcpy (where, (char *)&addr + offset, 4);
+ memcpy (store_ip, (char *)&addr + offset, 4);
return 1;
}
- /* By now we know that the address is not of the form d.d.d.d. Try
- to find it in our cache of host addresses. */
- addr_text = hash_table_get (host_name_address_map, hostname);
+ /* 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_address_map)
+ addr_text = hash_table_get (host_name_address_map, hostname);
+
if (addr_text)
{
DEBUGP (("Found %s in host_name_address_map: %s\n",
goto have_addr;
}
- /* Maybe this host is known to us under another name. If so, we'll
- find it in host_slave_master_map, and use the master name to find
- its address in host_name_address_map. */
- canonical_name = hash_table_get (host_slave_master_map, hostname);
- if (canonical_name)
- {
- addr_text = hash_table_get (host_name_address_map, canonical_name);
- assert (addr_text != NULL);
- DEBUGP (("Found %s as slave of %s -> %s\n",
- hostname, canonical_name, addr_text));
- addr = (unsigned long)inet_addr (addr_text);
- goto have_addr;
- }
-
- /* Since all else has failed, let's try gethostbyname(). Note that
- we use gethostbyname() rather than ngethostbyname(), because we
- already know that the address is not numerical. */
+ /* 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 (hostname);
if (!hptr)
return 0;
- /* Copy the address of the host to socket description. */
- memcpy (where, hptr->h_addr_list[0], hptr->h_length);
+
+ /* Store the IP address to the desired location. */
assert (hptr->h_length == 4);
+ memcpy (store_ip, hptr->h_addr_list[0], hptr->h_length);
+
+ /* Now that we've successfully looked up the host, store this
+ information in the cache. */
- /* Now that we've gone through the truoble of calling
- gethostbyname(), we can store this valuable information to the
- cache. First, we have to look for it by address to know if it's
- already in the cache by another name. */
/* Originally, we copied to in.s_addr, but it appears to be missing
on some systems. */
memcpy (&in, *hptr->h_addr_list, sizeof (in));
inet_s = inet_ntoa (in);
add_host_to_cache (hostname, inet_s);
+
return 1;
}
void
host_cleanup (void)
{
- /* host_name_address_map and host_address_name_map share the
- strings. Because of that, calling free_keys_and_values once
- suffices for both. */
free_keys_and_values (host_name_address_map);
hash_table_destroy (host_name_address_map);
- hash_table_destroy (host_address_name_map);
- free_keys_and_values (host_slave_master_map);
- hash_table_destroy (host_slave_master_map);
-}
-
-void
-host_init (void)
-{
- host_name_address_map = make_string_hash_table (0);
- host_address_name_map = make_string_hash_table (0);
- host_slave_master_map = make_string_hash_table (0);
}
projects / wget / commitdiff