/*

 * Copyright (c) 2018 Red Hat Inc

 *

 * 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.

 *     * The names of contributors to this software may not be

 *       used to endorse or promote products derived from this

 *       software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE

 * COPYRIGHT OWNER 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.

 *

 * Author: Daiki Ueno

 */

#include "config.h"

#include "runtime.h"

#include "compat.h"

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#ifdef OS_UNIX

#include <pwd.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <unistd.h>

static const char * const _p11_runtime_bases_default[] = { "/run", "/var/run", NULL };

const char * const *_p11_runtime_bases = _p11_runtime_bases_default;

#endif

CK_RV

p11_get_runtime_directory (char **directoryp)

{

	const char *envvar;

	char *directory;

#ifdef OS_UNIX

	const char * const *bases = _p11_runtime_bases;

	char *prefix;

	uid_t uid;

	struct stat sb;

	struct passwd pwbuf, *pw;

	char buf[1024];

	int i;

#endif

	/* We can't always assume the XDG_RUNTIME_DIR envvar here,

	 * because the PKCS#11 module can be loaded by a program that

	 * calls setuid().  */

	envvar = secure_getenv ("XDG_RUNTIME_DIR");

	if (envvar != NULL && envvar[0] != '\0') {

		directory = strdup (envvar);

		if (!directory)

			return CKR_HOST_MEMORY;

		*directoryp = directory;

		return CKR_OK;

	}

#ifdef OS_UNIX

	uid = getuid ();

	for (i = 0; bases[i] != NULL; i++) {

		if (asprintf (&prefix, "%s/user/%u",

			      bases[i], (unsigned int) uid) < 0)

			return CKR_HOST_MEMORY;

		if (stat (prefix, &sb) != -1 && S_ISDIR (sb.st_mode)) {

			*directoryp = prefix;

			return CKR_OK;

		}

		free (prefix);

	}

#endif

	/* We can't use /run/user/<UID>, fallback to ~/.cache.  */

	envvar = secure_getenv ("XDG_CACHE_HOME");

	if (envvar != NULL && envvar[0] != '\0') {

		directory = strdup (envvar);

		if (!directory)

			return CKR_HOST_MEMORY;

		*directoryp = directory;

		return CKR_OK;

	}

#ifdef OS_UNIX

	if (getpwuid_r (uid, &pwbuf, buf, sizeof buf, &pw) == 0 &&

	    pw != NULL && pw->pw_dir != NULL && *pw->pw_dir == '/') {

		if (asprintf (&directory, "%s/.cache", pw->pw_dir) < 0)

			return CKR_HOST_MEMORY;

		*directoryp = directory;

		return CKR_OK;

	}

#endif

	return CKR_GENERAL_ERROR;

}