int gethostbyaddr_r(FAR const void *addr, socklen_t len, int type,
FAR struct hostent *host, FAR char *buf,
size_t buflen, int *h_errnop)
{
FAR FILE *stream;
int herrnocode;
int nread;
DEBUGASSERT(addr != NULL && host != NULL && buf != NULL);
DEBUGASSERT(type == AF_INET || type == AF_INET6);
/* Make sure that the h_errno has a non-error code */
if (h_errnop)
{
*h_errnop = 0;
}
#ifdef CONFIG_NET_LOOPBACK
/* Check for the local loopback address */
if (lib_localhost(addr, len, type, host, buf, buflen, h_errnop) == 0)
{
/* Yes.. we are done */
return OK;
}
#endif
/* TODO:
*
* 1. Look in the DNS cache to see if we have the address mapping already
* in place. If not,
* 2. Perform a reverse DNS lookup. And if that fails as well, then
* finally
* 3. Search the hosts file for a match.
*/
/* Search the hosts file for a match */
return lib_hostfile_lookup(addr, len, type, host, buf, buflen, h_errnop);
}
int gethostbyname_r(FAR const char *name, FAR struct hostent *host,
FAR char *buf, size_t buflen, int *h_errnop)
{
#ifdef CONFIG_NETDB_DNSCLIENT
int ret;
#endif
DEBUGASSERT(name != NULL && host != NULL && buf != NULL);
/* Make sure that the h_errno has a non-error code */
if (h_errnop)
{
*h_errnop = 0;
}
/* Check for a numeric hostname */
if (lib_numeric_address(name, host, buf, buflen) == 0)
{
/* Yes.. we are done */
return OK;
}
#ifdef CONFIG_NET_LOOPBACK
/* Check for the local loopback host name */
if (lib_localhost(name, host, buf, buflen) == 0)
{
/* Yes.. we are done */
return OK;
}
#endif
/* Try to find the name in the HOSTALIASES environment variable */
/* REVISIT: Not implemented */
#ifdef CONFIG_NETDB_DNSCLIENT
#if CONFIG_NETDB_DNSCLIENT_ENTRIES > 0
/* Check if we already have this hostname mapping cached */
ret = lib_find_answer(name, host, buf, buflen);
if (ret >= 0)
{
/* Found the address mapping in the cache */
return OK;
}
#endif
/* Try to get the host address using the DNS name server */
ret = lib_dns_lookup(name, host, buf, buflen);
if (ret >= 0)
{
/* Successful DNS lookup! */
return OK;
}
#endif /* CONFIG_NETDB_DNSCLIENT */
#ifdef CONFIG_NETDB_HOSTFILE
/* Search the hosts file for a match */
return lib_hostfile_lookup(name, host, buf, buflen, h_errnop);
#else
/* The host file file is not supported. The host name mapping was not
* found from any lookup heuristic
*/
if (h_errnop)
{
*h_errnop = HOST_NOT_FOUND;
}
return ERROR;
#endif
}