struct address_list *
lookup_host (const char *host, int silent)
{
struct address_list *al = NULL;
uint32_t addr_ipv4;
ip_address addr;
/* First, try to check whether the address is already a numeric
address. */
#ifdef ENABLE_IPV6
if (inet_pton (AF_INET6, host, &addr) > 0)
return address_list_from_single (&addr);
#endif
addr_ipv4 = (uint32_t)inet_addr (host);
if (addr_ipv4 != (uint32_t)-1)
{
/* ADDR is defined to be in network byte order, which is what
this returns, so we can just copy it to STORE_IP. */
map_ipv4_to_ip ((ip4_address *)&addr_ipv4, &addr);
return address_list_from_single (&addr);
}
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;
}
}
if (!silent)
logprintf (LOG_VERBOSE, _("Resolving %s... "), host);
/* Host name lookup goes on below. */
#ifdef HAVE_GETADDRINFO
{
struct addrinfo hints, *ai;
int err;
memset (&hints, 0, sizeof (hints));
if (ip_default_family == AF_INET)
hints.ai_family = AF_INET;
else
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
err = getaddrinfo_with_timeout (host, NULL, &hints, &ai, opt.dns_timeout);
if (err != 0 || ai == NULL)
{
if (!silent)
logprintf (LOG_VERBOSE, _("failed: %s.\n"),
err != EAI_SYSTEM ? gai_strerror (err) : strerror (errno));
return NULL;
}
al = address_list_from_addrinfo (ai);
freeaddrinfo (ai);
}
#else
{
struct hostent *hptr;
hptr = gethostbyname_with_timeout (host, opt.dns_timeout);
if (!hptr)
{
if (!silent)
{
if (errno != ETIMEDOUT)
logprintf (LOG_VERBOSE, _("failed: %s.\n"), herrmsg (h_errno));
else
logputs (LOG_VERBOSE, _("failed: timed out.\n"));
}
return NULL;
}
/* Do all systems have h_addr_list, or is it a newer thing? If
the latter, use address_list_from_single. */
al = address_list_from_vector (hptr->h_addr_list);
}
#endif
/* Print the addresses determined by DNS lookup, but no more than
three. */
if (!silent)
{
int i;
int printmax = al->count <= 3 ? al->count : 3;
for (i = 0; i < printmax; i++)
{
logprintf (LOG_VERBOSE, "%s",
pretty_print_address (al->addresses + i));
if (i < printmax - 1)
logputs (LOG_VERBOSE, ", ");
}
if (printmax != al->count)
logputs (LOG_VERBOSE, ", ...");
logputs (LOG_VERBOSE, "\n");
}
/* Cache the lookup information. */
if (opt.dns_cache)
cache_host_lookup (host, al);
return al;
}
struct address_list *
lookup_host (const char *host, int silent)
{
struct address_list *al = NULL;
unsigned long addr;
struct hostent *hptr;
/* 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)
{
/* 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;
#ifdef WORDS_BIGENDIAN
offset = sizeof (unsigned long) - IP4_ADDRESS_LENGTH;
#else
offset = 0;
#endif
return address_list_new_one ((char *)&addr + offset);
}
/* 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;
}
if (!silent)
logprintf (LOG_VERBOSE, _("Resolving %s... "), host);
/* Look up the host using gethostbyname(). */
hptr = gethostbyname (host);
if (!hptr)
{
if (!silent)
logprintf (LOG_VERBOSE, _("failed: %s.\n"), herrmsg (h_errno));
return NULL;
}
if (!silent)
logprintf (LOG_VERBOSE, _("done.\n"));
/* 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);
/* Cache the lookup information. */
cache_host_lookup (host, al);
return al;
}
