enum nss_status
_nss_dns_getnetbyname_r (const char *name, struct netent *result,
char *buffer, size_t buflen, int *errnop,
int *herrnop)
{
/* Return entry for network with NAME. */
union
{
querybuf *buf;
u_char *ptr;
} net_buffer;
querybuf *orig_net_buffer;
int anslen;
enum nss_status status;
struct resolv_context *ctx = __resolv_context_get ();
if (ctx == NULL)
{
*errnop = errno;
*herrnop = NETDB_INTERNAL;
return NSS_STATUS_UNAVAIL;
}
net_buffer.buf = orig_net_buffer = (querybuf *) alloca (1024);
anslen = __res_context_search
(ctx, name, C_IN, T_PTR, net_buffer.buf->buf,
1024, &net_buffer.ptr, NULL, NULL, NULL, NULL);
if (anslen < 0)
{
/* Nothing found. */
*errnop = errno;
if (net_buffer.buf != orig_net_buffer)
free (net_buffer.buf);
__resolv_context_put (ctx);
return (errno == ECONNREFUSED
|| errno == EPFNOSUPPORT
|| errno == EAFNOSUPPORT)
? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND;
}
status = getanswer_r (net_buffer.buf, anslen, result, buffer, buflen,
errnop, herrnop, BYNAME);
if (net_buffer.buf != orig_net_buffer)
free (net_buffer.buf);
__resolv_context_put (ctx);
return status;
}
int
__nss_hostname_digits_dots (const char *name, struct hostent *resbuf,
char **buffer, size_t *buffer_size,
size_t buflen, struct hostent **result,
enum nss_status *status, int af, int *h_errnop)
{
/* We have to test for the use of IPv6 which can only be done by
examining `_res'. */
struct resolv_context *ctx = __resolv_context_get ();
if (ctx == NULL)
{
if (h_errnop)
*h_errnop = NETDB_INTERNAL;
if (buffer_size == NULL)
*status = NSS_STATUS_TRYAGAIN;
else
*result = NULL;
return -1;
}
int ret = __nss_hostname_digits_dots_context
(ctx, name, resbuf, buffer, buffer_size, buflen,
result, status, af, h_errnop);
__resolv_context_put (ctx);
return ret;
}
LOOKUP_TYPE *
FUNCTION_NAME (ADD_PARAMS)
{
static size_t buffer_size;
static LOOKUP_TYPE resbuf;
LOOKUP_TYPE *result;
#ifdef NEED_H_ERRNO
int h_errno_tmp = 0;
#endif
#ifdef HANDLE_DIGITS_DOTS
/* Wrap both __nss_hostname_digits_dots and the actual lookup
function call in the same context. */
struct resolv_context *res_ctx = __resolv_context_get ();
if (res_ctx == NULL)
{
# if NEED_H_ERRNO
__set_h_errno (NETDB_INTERNAL);
# endif
return NULL;
}
#endif
/* Get lock. */
__libc_lock_lock (lock);
if (buffer == NULL)
{
buffer_size = BUFLEN;
buffer = (char *) malloc (buffer_size);
}
#ifdef HANDLE_DIGITS_DOTS
if (buffer != NULL)
{
if (__nss_hostname_digits_dots_context
(res_ctx, name, &resbuf, &buffer, &buffer_size, 0, &result, NULL,
AF_VAL, H_ERRNO_VAR_P))
goto done;
}
#endif
while (buffer != NULL
&& (INTERNAL (REENTRANT_NAME) (ADD_VARIABLES, &resbuf, buffer,
buffer_size, &result H_ERRNO_VAR)
== ERANGE)
#ifdef NEED_H_ERRNO
&& h_errno_tmp == NETDB_INTERNAL
#endif
)
{
char *new_buf;
buffer_size *= 2;
new_buf = (char *) realloc (buffer, buffer_size);
if (new_buf == NULL)
{
/* We are out of memory. Free the current buffer so that the
process gets a chance for a normal termination. */
free (buffer);
__set_errno (ENOMEM);
}
buffer = new_buf;
}
if (buffer == NULL)
result = NULL;
#ifdef HANDLE_DIGITS_DOTS
done:
#endif
/* Release lock. */
__libc_lock_unlock (lock);
#ifdef HANDLE_DIGITS_DOTS
__resolv_context_put (res_ctx);
#endif
#ifdef NEED_H_ERRNO
if (h_errno_tmp != 0)
__set_h_errno (h_errno_tmp);
#endif
return result;
}
enum nss_status
_nss_dns_getnetbyaddr_r (uint32_t net, int type, struct netent *result,
char *buffer, size_t buflen, int *errnop,
int *herrnop)
{
/* Return entry for network with NAME. */
enum nss_status status;
union
{
querybuf *buf;
u_char *ptr;
} net_buffer;
querybuf *orig_net_buffer;
unsigned int net_bytes[4];
char qbuf[MAXDNAME];
int cnt, anslen;
uint32_t net2;
int olderr = errno;
/* No net address lookup for IPv6 yet. */
if (type != AF_INET)
return NSS_STATUS_UNAVAIL;
struct resolv_context *ctx = __resolv_context_get ();
if (ctx == NULL)
{
*errnop = errno;
*herrnop = NETDB_INTERNAL;
return NSS_STATUS_UNAVAIL;
}
net2 = (uint32_t) net;
for (cnt = 4; net2 != 0; net2 >>= 8)
net_bytes[--cnt] = net2 & 0xff;
switch (cnt)
{
case 3:
/* Class A network. */
sprintf (qbuf, "0.0.0.%u.in-addr.arpa", net_bytes[3]);
break;
case 2:
/* Class B network. */
sprintf (qbuf, "0.0.%u.%u.in-addr.arpa", net_bytes[3], net_bytes[2]);
break;
case 1:
/* Class C network. */
sprintf (qbuf, "0.%u.%u.%u.in-addr.arpa", net_bytes[3], net_bytes[2],
net_bytes[1]);
break;
case 0:
/* Class D - E network. */
sprintf (qbuf, "%u.%u.%u.%u.in-addr.arpa", net_bytes[3], net_bytes[2],
net_bytes[1], net_bytes[0]);
break;
}
net_buffer.buf = orig_net_buffer = (querybuf *) alloca (1024);
anslen = __res_context_query (ctx, qbuf, C_IN, T_PTR, net_buffer.buf->buf,
1024, &net_buffer.ptr, NULL, NULL, NULL, NULL);
if (anslen < 0)
{
/* Nothing found. */
int err = errno;
__set_errno (olderr);
if (net_buffer.buf != orig_net_buffer)
free (net_buffer.buf);
__resolv_context_put (ctx);
return (err == ECONNREFUSED
|| err == EPFNOSUPPORT
|| err == EAFNOSUPPORT)
? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND;
}
status = getanswer_r (net_buffer.buf, anslen, result, buffer, buflen,
errnop, herrnop, BYADDR);
if (net_buffer.buf != orig_net_buffer)
free (net_buffer.buf);
if (status == NSS_STATUS_SUCCESS)
{
/* Strip trailing zeros. */
unsigned int u_net = net; /* Maybe net should be unsigned? */
while ((u_net & 0xff) == 0 && u_net != 0)
u_net >>= 8;
result->n_net = u_net;
}
