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;
}
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;
char *qbuf;
enum nss_status status;
if (__res_maybe_init (&_res, 0) == -1)
return NSS_STATUS_UNAVAIL;
qbuf = strdupa (name);
net_buffer.buf = orig_net_buffer = (querybuf *) alloca (1024);
anslen = __libc_res_nsearch (&_res, qbuf, 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);
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);
return status;
}
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;
u_int32_t net2;
int olderr = errno;
/* No net address lookup for IPv6 yet. */
if (type != AF_INET)
return NSS_STATUS_UNAVAIL;
if (__res_maybe_init (&_res, 0) == -1)
return NSS_STATUS_UNAVAIL;
net2 = (u_int32_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 = __libc_res_nquery (&_res, 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);
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;
}
