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/* nbdkit
* Copyright Red Hat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include "open_memstream.h"
#include "utils.h"
#include "internal.h"
char *uri; /* NBD URI */
char *
make_uri (void)
{
FILE *fp;
size_t len = 0;
char *r = NULL;
const bool tls_required = tls == 2;
const char *scheme;
bool query_appended;
switch (service_mode) {
case SERVICE_MODE_SOCKET_ACTIVATION:
case SERVICE_MODE_LISTEN_STDIN:
/* can't form a URI, uri will be NULL */
goto out;
default: ;
}
/* Work out the scheme. */
switch (service_mode) {
case SERVICE_MODE_TCPIP:
scheme = tls_required ? "nbds" : "nbd";
break;
case SERVICE_MODE_UNIXSOCKET:
scheme = tls_required ? "nbds+unix" : "nbd+unix";
break;
case SERVICE_MODE_VSOCK:
scheme = tls_required ? "nbds+vsock" : "nbd+vsock";
break;
case SERVICE_MODE_SOCKET_ACTIVATION:
case SERVICE_MODE_LISTEN_STDIN:
/* these labels are not-reachable, see above */
/*FALLTHROUGH*/
default:
abort ();
}
/* Open the memory stream to store the URI. */
fp = open_memstream (&r, &len);
if (fp == NULL) {
perror ("uri: open_memstream");
exit (EXIT_FAILURE);
}
fprintf (fp, "%s://", scheme);
switch (service_mode) {
case SERVICE_MODE_UNIXSOCKET:
if (export_name && strcmp (export_name, "") != 0) {
putc ('/', fp);
uri_quote (export_name, fp);
}
fprintf (fp, "?socket=");
uri_quote (unixsocket, fp);
query_appended = true;
break;
case SERVICE_MODE_VSOCK:
/* 1 = VMADDR_CID_LOCAL */
putc ('1', fp);
if (port) {
putc (':', fp);
fputs (port, fp);
}
if (export_name && strcmp (export_name, "") != 0) {
putc ('/', fp);
uri_quote (export_name, fp);
}
query_appended = false;
break;
case SERVICE_MODE_TCPIP:
fputs ("localhost", fp);
if (port) {
putc (':', fp);
fputs (port, fp);
}
if (export_name && strcmp (export_name, "") != 0) {
putc ('/', fp);
uri_quote (export_name, fp);
}
query_appended = false;
break;
case SERVICE_MODE_SOCKET_ACTIVATION:
case SERVICE_MODE_LISTEN_STDIN:
/* these labels are not-reachable, see above */
/*FALLTHROUGH*/
default:
abort ();
}
/* For TLS, append tls-certificates or tls-psk-file. Note that
* tls-certificates requires libnbd >= 1.10 (Sep 2021) and it fails
* strangely with older versions (RHEL 8 is too old). Hopefully
* this will resolve itself over time as people upgrade libnbd.
* Qemu ignores these parameters, see:
* https://lists.libguestfs.org/archives/list/guestfs@lists.libguestfs.org/message/PDXCGDWJD2FHFNQNSFKH752IMVOAW2KI/
*/
if (tls_required && (tls_certificates_dir || tls_psk)) {
putc (query_appended ? '&' : '?', fp);
if (tls_certificates_dir) {
fputs ("tls-certificates=", fp);
uri_quote (tls_certificates_dir, fp);
}
else if (tls_psk) {
fputs ("tls-psk-file=", fp);
uri_quote (tls_psk, fp);
}
}
if (close_memstream (fp) == EOF) {
perror ("uri: close_memstream");
exit (EXIT_FAILURE);
}
out:
if (r)
debug ("NBD URI: %s", r);
else
debug ("no NBD URI because service mode is %s",
service_mode_string (service_mode));
return r;
}
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