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/* NBD client library in userspace
* Copyright Red Hat
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* Check for a requirement or skip the test. */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include "requires.h"
void
requires (const char *cmd)
{
printf ("requires %s\n", cmd);
fflush (stdout);
if (system (cmd) != 0) {
printf ("Test skipped because prerequisite is missing or not working.\n");
exit (77);
}
}
void
requires_not (const char *cmd)
{
printf ("requires_not %s\n", cmd);
fflush (stdout);
if (system (cmd) == 0) {
printf ("Test skipped because prerequisite is missing or not working.\n");
exit (77);
}
}
void
requires_not_exists (const char *filename)
{
printf ("requires_not_exists %s\n", filename);
fflush (stdout);
if (access (filename, F_OK) == 0) {
printf ("Test skipped because file '%s' exists.\n", filename);
exit (77);
}
}
#ifdef QEMU_NBD
/* Check qemu-nbd was compiled with support for TLS. */
void
requires_qemu_nbd_tls_support (void)
{
char cmd[256];
/* Note the qemu-nbd command will fail in some way. We're only
* interested in the error message that it prints.
*/
snprintf (cmd, sizeof cmd,
"! " QEMU_NBD " --object tls-creds-x509,id=tls0 2>&1 \\\n"
" | grep -sq 'TLS credentials support requires GNUTLS'\n");
requires (cmd);
}
/* Check qemu-nbd supports PSK (version 3.0.0 and above). */
void
requires_qemu_nbd_tls_psk_support (void)
{
char cmd[256];
/* Note the qemu-nbd command will fail in some way. We're only
* interested in the error message that it prints.
*/
snprintf (cmd, sizeof cmd,
"! " QEMU_NBD " --object tls-creds-psk,id=tls0 / 2>&1 \\\n"
" | grep -sq 'invalid object type'\n");
requires (cmd);
}
#else /* !QEMU_NBD */
void
requires_qemu_nbd_tls_support (void)
{
fprintf (stderr, "qemu-nbd not available at compile time\n");
exit (77);
}
void
requires_qemu_nbd_tls_psk_support (void)
{
fprintf (stderr, "qemu-nbd not available at compile time\n");
exit (77);
}
#endif
#ifdef NBD_SERVER
/* On some distros, nbd-server is built without support for syslog
* which prevents use of inetd mode. Instead nbd-server will exit with
* this error:
*
* Error: inetd mode requires syslog
* Exiting.
*
* https://listman.redhat.com/archives/libguestfs/2022-January/msg00003.html
*/
void
requires_nbd_server_supports_inetd (void)
{
char cmd[256];
snprintf (cmd, sizeof cmd, "\"%s\" --version", NBD_SERVER);
requires (cmd);
snprintf (cmd, sizeof cmd,
"grep 'inetd mode requires syslog' \"$(command -v \"%s\")\"",
NBD_SERVER);
requires_not (cmd);
}
#else /* !NBD_SERVER */
void
requires_nbd_server_supports_inetd (void)
{
fprintf (stderr, "nbd-server not available at compile time\n");
exit (77);
}
#endif
/* If SERVER_PARAMS contains --tls-verify-peer we must make sure
* that nbdkit supports that option.
*/
void
requires_nbdkit_tls_verify_peer (void)
{
#ifdef NBDKIT
requires (NBDKIT " --tls-verify-peer -U - null --run 'exit 0'");
#else
fprintf (stderr, "nbdkit not available at compile time\n");
exit (77);
#endif
}
/* Check that ssh to localhost will work without any passwords or phrases.
* See nbdkit:tests/test-ssh.sh
*/
void
requires_ssh_localhost (void)
{
requires ("ssh -V");
requires ("ssh -o PreferredAuthentications=none,publickey "
"-o StrictHostKeyChecking=no localhost echo </dev/null");
}
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