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/* This example shows how to connect to an NBD
* server using the server's NBD URI.
*
* To test this with a recent version of nbdkit
* that supports the '$uri' syntax, do:
*
* nbdkit -U - random 1M \
* --run './connect-uri $uri'
*
* To test connecting to a remote NBD server
* listening on port 10809, do:
*
* ./connect-uri nbd://remote/
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <stdint.h>
#include <inttypes.h>
#include <libnbd.h>
int
main (int argc, char *argv[])
{
struct nbd_handle *nbd;
char *s;
int64_t size;
if (argc != 2) {
fprintf (stderr, "usage: %s URI\n",
argv[0]);
exit (EXIT_FAILURE);
}
/* Create the libnbd handle. */
nbd = nbd_create ();
if (nbd == NULL) {
fprintf (stderr, "%s\n", nbd_get_error ());
exit (EXIT_FAILURE);
}
/* Request full information
* (for nbd_get_canonical_export_name below)
*/
#if LIBNBD_HAVE_NBD_SET_FULL_INFO
if (nbd_set_full_info (nbd, true) == -1) {
fprintf (stderr, "%s\n", nbd_get_error ());
exit (EXIT_FAILURE);
}
#endif
/* Connect to the NBD URI. */
printf ("connecting to %s ...\n", argv[1]);
fflush (stdout);
if (nbd_connect_uri (nbd, argv[1]) == -1) {
fprintf (stderr, "%s\n", nbd_get_error ());
exit (EXIT_FAILURE);
}
printf ("connected\n");
/* Print the URI, export name, size and other info. */
printf ("requested URI: %s\n", argv[1]);
s = nbd_get_uri (nbd);
printf ("generated URI: %s\n", s ? s : "NULL");
free (s);
size = nbd_get_size (nbd);
if (size == -1) {
fprintf (stderr, "%s\n", nbd_get_error ());
exit (EXIT_FAILURE);
}
printf ("size: %" PRIi64 "\n", size);
s = nbd_get_export_name (nbd);
printf ("requested export name: %s\n", s ? s : "NULL");
free (s);
#if LIBNBD_HAVE_NBD_GET_CANONICAL_EXPORT_NAME
s = nbd_get_canonical_export_name (nbd);
printf ("canonical export name: %s\n", s ? s : "NULL");
free (s);
#endif
#if LIBNBD_HAVE_NBD_GET_EXPORT_DESCRIPTION
s = nbd_get_export_description (nbd);
printf ("export description: %s\n", s ? s : "NULL");
free (s);
#endif
/* Close the libnbd handle. */
nbd_close (nbd);
exit (EXIT_SUCCESS);
}
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