void ares_gethostbyname(ares_channel channel, const char *name, int family,
ares_host_callback callback, void *arg)
{
struct host_query *hquery;
/* Right now we only know how to look up Internet addresses - and unspec
means try both basically. */
switch (family) {
case AF_INET:
case AF_INET6:
case AF_UNSPEC:
break;
default:
callback(arg, ARES_ENOTIMP, 0, NULL);
return;
}
if (fake_hostent(name, family, callback, arg))
return;
/* Allocate and fill in the host query structure. */
hquery = ares_malloc(sizeof(struct host_query));
if (!hquery)
{
callback(arg, ARES_ENOMEM, 0, NULL);
return;
}
hquery->channel = channel;
hquery->name = ares_strdup(name);
hquery->want_family = family;
hquery->sent_family = -1; /* nothing is sent yet */
if (!hquery->name) {
ares_free(hquery);
callback(arg, ARES_ENOMEM, 0, NULL);
return;
}
hquery->callback = callback;
hquery->arg = arg;
hquery->remaining_lookups = channel->lookups;
hquery->timeouts = 0;
/* Start performing lookups according to channel->lookups. */
next_lookup(hquery, ARES_ECONNREFUSED /* initial error code */);
}
void ares_gethostbyname(ares_channel channel, const char *name, int family,
ares_host_callback callback, void *arg)
{
struct host_query *hquery;
/* See if request can be handled by local pseudo-domain DNS */
if (ares_local_gethostbyname(channel, name, family, callback, arg))
{
return;
}
/* Right now we only know how to look up Internet addresses. */
if (family != AF_INET)
{
callback(arg, ARES_ENOTIMP, NULL);
return;
}
if (fake_hostent(name, callback, arg))
return;
/* Allocate and fill in the host query structure. */
hquery = malloc(sizeof(struct host_query));
if (!hquery)
{
callback(arg, ARES_ENOMEM, NULL);
return;
}
hquery->channel = channel;
hquery->name = strdup(name);
if (!hquery->name)
{
free(hquery);
callback(arg, ARES_ENOMEM, NULL);
return;
}
hquery->callback = callback;
hquery->arg = arg;
hquery->remaining_lookups = channel->lookups;
/* Start performing lookups according to channel->lookups. */
next_lookup(hquery);
}
