[mirror_zfs.git] / lib / libshare / smb.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2011,2012 Turbo Fredriksson <turbo@bayour.com>, based on nfs.c
 *                         by Gunnar Beutner
 *
 * This is an addition to the zfs device driver to add, modify and remove SMB
 * shares using the 'net share' command that comes with Samba.
 *
 * TESTING
 * Make sure that samba listens to 'localhost' (127.0.0.1) and that the options
 * 'usershare max shares' and 'usershare owner only' have been rewied/set
 * accordingly (see zfs(8) for information).
 *
 * Once configuration in samba have been done, test that this
 * works with the following three commands (in this case, my ZFS
 * filesystem is called 'share/Test1'):
 *
 *	(root)# net -U root -S 127.0.0.1 usershare add Test1 /share/Test1 \
 *		"Comment: /share/Test1" "Everyone:F"
 *	(root)# net usershare list | grep -i test
 *	(root)# net -U root -S 127.0.0.1 usershare delete Test1
 *
 * The first command will create a user share that gives everyone full access.
 * To limit the access below that, use normal UNIX commands (chmod, chown etc).
 */

#include <time.h>
#include <stdlib.h>
#include <stdio.h>
#include <strings.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <libzfs.h>
#include <libshare.h>
#include "libshare_impl.h"
#include "smb.h"

static boolean_t smb_available(void);

static sa_fstype_t *smb_fstype;

/*
 * Retrieve the list of SMB shares.
 */
static int
smb_retrieve_shares(void)
{
	int rc = SA_OK;
	char file_path[PATH_MAX], line[512], *token, *key, *value;
	char *dup_value, *path = NULL, *comment = NULL, *name = NULL;
	char *guest_ok = NULL;
	DIR *shares_dir;
	FILE *share_file_fp = NULL;
	struct dirent *directory;
	struct stat eStat;
	smb_share_t *shares, *new_shares = NULL;

	/* opendir(), stat() */
	shares_dir = opendir(SHARE_DIR);
	if (shares_dir == NULL)
		return (SA_SYSTEM_ERR);

	/* Go through the directory, looking for shares */
	while ((directory = readdir(shares_dir))) {
		if (directory->d_name[0] == '.')
			continue;

		snprintf(file_path, sizeof (file_path),
		    "%s/%s", SHARE_DIR, directory->d_name);

		if (stat(file_path, &eStat) == -1) {
			rc = SA_SYSTEM_ERR;
			goto out;
		}

		if (!S_ISREG(eStat.st_mode))
			continue;

		if ((share_file_fp = fopen(file_path, "r")) == NULL) {
			rc = SA_SYSTEM_ERR;
			goto out;
		}

		name = strdup(directory->d_name);
		if (name == NULL) {
			rc = SA_NO_MEMORY;
			goto out;
		}

		while (fgets(line, sizeof (line), share_file_fp)) {
			if (line[0] == '#')
				continue;

			/* Trim trailing new-line character(s). */
			while (line[strlen(line) - 1] == '\r' ||
			    line[strlen(line) - 1] == '\n')
				line[strlen(line) - 1] = '\0';

			/* Split the line in two, separated by '=' */
			token = strchr(line, '=');
			if (token == NULL)
				continue;

			key = line;
			value = token + 1;
			*token = '\0';

			dup_value = strdup(value);
			if (dup_value == NULL) {
				rc = SA_NO_MEMORY;
				goto out;
			}

			if (strcmp(key, "path") == 0)
				path = dup_value;
			if (strcmp(key, "comment") == 0)
				comment = dup_value;
			if (strcmp(key, "guest_ok") == 0)
				guest_ok = dup_value;

			if (path == NULL || comment == NULL || guest_ok == NULL)
				continue; /* Incomplete share definition */
			else {
				shares = (smb_share_t *)
						malloc(sizeof (smb_share_t));
				if (shares == NULL) {
					rc = SA_NO_MEMORY;
					goto out;
				}

				strncpy(shares->name, name,
					sizeof (shares->name));
				shares->name [sizeof (shares->name) - 1] = '\0';

				strncpy(shares->path, path,
				    sizeof (shares->path));
				shares->path [sizeof (shares->path) - 1] = '\0';

				strncpy(shares->comment, comment,
				    sizeof (shares->comment));
				shares->comment[sizeof (shares->comment)-1] =
				    '\0';

				shares->guest_ok = atoi(guest_ok);

				shares->next = new_shares;
				new_shares = shares;

				name = NULL;
				path = NULL;
				comment = NULL;
				guest_ok = NULL;
			}
		}

out:
		if (share_file_fp != NULL)
			fclose(share_file_fp);

		free(name);
		free(path);
		free(comment);
		free(guest_ok);
	}
	closedir(shares_dir);

	smb_shares = new_shares;

	return (rc);
}

/*
 * Used internally by smb_enable_share to enable sharing for a single host.
 */
static int
smb_enable_share_one(const char *sharename, const char *sharepath)
{
	char *argv[10], *pos;
	char name[SMB_NAME_MAX], comment[SMB_COMMENT_MAX];
	int rc;

	/* Support ZFS share name regexp '[[:alnum:]_-.: ]' */
	strncpy(name, sharename, sizeof (name));
	name [sizeof (name)-1] = '\0';

	pos = name;
	while (*pos != '\0') {
		switch (*pos) {
		case '/':
		case '-':
		case ':':
		case ' ':
			*pos = '_';
		}

		++pos;
	}

	/*
	 * CMD: net -S NET_CMD_ARG_HOST usershare add Test1 /share/Test1 \
	 *      "Comment" "Everyone:F"
	 */
	snprintf(comment, sizeof (comment), "Comment: %s", sharepath);

	argv[0] = NET_CMD_PATH;
	argv[1] = (char *)"-S";
	argv[2] = NET_CMD_ARG_HOST;
	argv[3] = (char *)"usershare";
	argv[4] = (char *)"add";
	argv[5] = (char *)name;
	argv[6] = (char *)sharepath;
	argv[7] = (char *)comment;
	argv[8] = "Everyone:F";
	argv[9] = NULL;

	rc = libzfs_run_process(argv[0], argv, 0);
	if (rc < 0)
		return (SA_SYSTEM_ERR);

	/* Reload the share file */
	(void) smb_retrieve_shares();

	return (SA_OK);
}

/*
 * Enables SMB sharing for the specified share.
 */
static int
smb_enable_share(sa_share_impl_t impl_share)
{
	char *shareopts;

	if (!smb_available())
		return (SA_SYSTEM_ERR);

	shareopts = FSINFO(impl_share, smb_fstype)->shareopts;
	if (shareopts == NULL) /* on/off */
		return (SA_SYSTEM_ERR);

	if (strcmp(shareopts, "off") == 0)
		return (SA_OK);

	/* Magic: Enable (i.e., 'create new') share */
	return (smb_enable_share_one(impl_share->dataset,
	    impl_share->sharepath));
}

/*
 * Used internally by smb_disable_share to disable sharing for a single host.
 */
static int
smb_disable_share_one(const char *sharename)
{
	int rc;
	char *argv[7];

	/* CMD: net -S NET_CMD_ARG_HOST usershare delete Test1 */
	argv[0] = NET_CMD_PATH;
	argv[1] = (char *)"-S";
	argv[2] = NET_CMD_ARG_HOST;
	argv[3] = (char *)"usershare";
	argv[4] = (char *)"delete";
	argv[5] = strdup(sharename);
	argv[6] = NULL;

	rc = libzfs_run_process(argv[0], argv, 0);
	if (rc < 0)
		return (SA_SYSTEM_ERR);
	else
		return (SA_OK);
}

/*
 * Disables SMB sharing for the specified share.
 */
static int
smb_disable_share(sa_share_impl_t impl_share)
{
	smb_share_t *shares = smb_shares;

	if (!smb_available()) {
		/*
		 * The share can't possibly be active, so nothing
		 * needs to be done to disable it.
		 */
		return (SA_OK);
	}

	while (shares != NULL) {
		if (strcmp(impl_share->sharepath, shares->path) == 0)
			return (smb_disable_share_one(shares->name));

		shares = shares->next;
	}

	return (SA_OK);
}

/*
 * Checks whether the specified SMB share options are syntactically correct.
 */
static int
smb_validate_shareopts(const char *shareopts)
{
	/* TODO: Accept 'name' and sec/acl (?) */
	if ((strcmp(shareopts, "off") == 0) || (strcmp(shareopts, "on") == 0))
		return (SA_OK);

	return (SA_SYNTAX_ERR);
}

/*
 * Checks whether a share is currently active.
 */
static boolean_t
smb_is_share_active(sa_share_impl_t impl_share)
{
	if (!smb_available())
		return (B_FALSE);

	/* Retrieve the list of (possible) active shares */
	smb_retrieve_shares();

	while (smb_shares != NULL) {
		if (strcmp(impl_share->sharepath, smb_shares->path) == 0)
			return (B_TRUE);

		smb_shares = smb_shares->next;
	}

	return (B_FALSE);
}

/*
 * Called to update a share's options. A share's options might be out of
 * date if the share was loaded from disk and the "sharesmb" dataset
 * property has changed in the meantime. This function also takes care
 * of re-enabling the share if necessary.
 */
static int
smb_update_shareopts(sa_share_impl_t impl_share, const char *resource,
    const char *shareopts)
{
	char *shareopts_dup;
	boolean_t needs_reshare = B_FALSE;
	char *old_shareopts;

	if (!impl_share)
		return (SA_SYSTEM_ERR);

	FSINFO(impl_share, smb_fstype)->active =
	    smb_is_share_active(impl_share);

	old_shareopts = FSINFO(impl_share, smb_fstype)->shareopts;

	if (FSINFO(impl_share, smb_fstype)->active && old_shareopts != NULL &&
		strcmp(old_shareopts, shareopts) != 0) {
		needs_reshare = B_TRUE;
		smb_disable_share(impl_share);
	}

	shareopts_dup = strdup(shareopts);

	if (shareopts_dup == NULL)
		return (SA_NO_MEMORY);

	if (old_shareopts != NULL)
		free(old_shareopts);

	FSINFO(impl_share, smb_fstype)->shareopts = shareopts_dup;

	if (needs_reshare)
		smb_enable_share(impl_share);

	return (SA_OK);
}

/*
 * Clears a share's SMB options. Used by libshare to
 * clean up shares that are about to be free()'d.
 */
static void
smb_clear_shareopts(sa_share_impl_t impl_share)
{
	free(FSINFO(impl_share, smb_fstype)->shareopts);
	FSINFO(impl_share, smb_fstype)->shareopts = NULL;
}

static const sa_share_ops_t smb_shareops = {
	.enable_share = smb_enable_share,
	.disable_share = smb_disable_share,

	.validate_shareopts = smb_validate_shareopts,
	.update_shareopts = smb_update_shareopts,
	.clear_shareopts = smb_clear_shareopts,
};

/*
 * Provides a convenient wrapper for determining SMB availability
 */
static boolean_t
smb_available(void)
{
	struct stat statbuf;

	if (lstat(SHARE_DIR, &statbuf) != 0 ||
	    !S_ISDIR(statbuf.st_mode))
		return (B_FALSE);

	if (access(NET_CMD_PATH, F_OK) != 0)
		return (B_FALSE);

	return (B_TRUE);
}

/*
 * Initializes the SMB functionality of libshare.
 */
void
libshare_smb_init(void)
{
	smb_fstype = register_fstype("smb", &smb_shareops);
}
Commit	Line	Data
645fb9cc TF	1	/*
	2	* CDDL HEADER START
	3	*
	4	* The contents of this file are subject to the terms of the
	5	* Common Development and Distribution License (the "License").
	6	* You may not use this file except in compliance with the License.
	7	*
	8	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	9	* or http://www.opensolaris.org/os/licensing.
	10	* See the License for the specific language governing permissions
	11	* and limitations under the License.
	12	*
	13	* When distributing Covered Code, include this CDDL HEADER in each
	14	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	15	* If applicable, add the following below this CDDL HEADER, with the
	16	* fields enclosed by brackets "[]" replaced with your own identifying
	17	* information: Portions Copyright [yyyy] [name of copyright owner]
	18	*
	19	* CDDL HEADER END
	20	*/
	21
	22	/*
	23	* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
	24	* Copyright (c) 2011,2012 Turbo Fredriksson <turbo@bayour.com>, based on nfs.c
	25	* by Gunnar Beutner
	26	*
	27	* This is an addition to the zfs device driver to add, modify and remove SMB
	28	* shares using the 'net share' command that comes with Samba.
d1d7e268	29	*
645fb9cc TF	30	* TESTING
	31	* Make sure that samba listens to 'localhost' (127.0.0.1) and that the options
	32	* 'usershare max shares' and 'usershare owner only' have been rewied/set
	33	* accordingly (see zfs(8) for information).
	34	*
	35	* Once configuration in samba have been done, test that this
	36	* works with the following three commands (in this case, my ZFS
	37	* filesystem is called 'share/Test1'):
	38	*
	39	* (root)# net -U root -S 127.0.0.1 usershare add Test1 /share/Test1 \
	40	* "Comment: /share/Test1" "Everyone:F"
	41	* (root)# net usershare list \| grep -i test
	42	* (root)# net -U root -S 127.0.0.1 usershare delete Test1
	43	*
	44	* The first command will create a user share that gives everyone full access.
	45	* To limit the access below that, use normal UNIX commands (chmod, chown etc).
	46	*/
	47
	48	#include <time.h>
	49	#include <stdlib.h>
	50	#include <stdio.h>
	51	#include <strings.h>
	52	#include <fcntl.h>
	53	#include <sys/wait.h>
	54	#include <unistd.h>
	55	#include <dirent.h>
	56	#include <sys/types.h>
	57	#include <sys/stat.h>
	58	#include <libzfs.h>
	59	#include <libshare.h>
	60	#include "libshare_impl.h"
	61	#include "smb.h"
	62
	63	static boolean_t smb_available(void);
	64
	65	static sa_fstype_t *smb_fstype;
	66
d1d7e268	67	/*
645fb9cc TF	68	* Retrieve the list of SMB shares.
	69	*/
	70	static int
	71	smb_retrieve_shares(void)
	72	{
	73	int rc = SA_OK;
	74	char file_path[PATH_MAX], line[512], token, key, *value;
	75	char dup_value, path = NULL, comment = NULL, name = NULL;
	76	char *guest_ok = NULL;
	77	DIR *shares_dir;
	78	FILE *share_file_fp = NULL;
	79	struct dirent *directory;
	80	struct stat eStat;
	81	smb_share_t shares, new_shares = NULL;
	82
	83	/* opendir(), stat() */
	84	shares_dir = opendir(SHARE_DIR);
	85	if (shares_dir == NULL)
d1d7e268	86	return (SA_SYSTEM_ERR);
645fb9cc TF	87
	88	/* Go through the directory, looking for shares */
	89	while ((directory = readdir(shares_dir))) {
	90	if (directory->d_name[0] == '.')
	91	continue;
	92
	93	snprintf(file_path, sizeof (file_path),
d1d7e268	94	"%s/%s", SHARE_DIR, directory->d_name);
645fb9cc TF	95
	96	if (stat(file_path, &eStat) == -1) {
	97	rc = SA_SYSTEM_ERR;
	98	goto out;
	99	}
	100
	101	if (!S_ISREG(eStat.st_mode))
	102	continue;
	103
	104	if ((share_file_fp = fopen(file_path, "r")) == NULL) {
	105	rc = SA_SYSTEM_ERR;
	106	goto out;
	107	}
	108
	109	name = strdup(directory->d_name);
	110	if (name == NULL) {
d1d7e268 MK	111	rc = SA_NO_MEMORY;
d1d7e268 MK	112	goto out;
645fb9cc TF	113	}
645fb9cc TF	114
d1d7e268	115	while (fgets(line, sizeof (line), share_file_fp)) {
645fb9cc TF	116	if (line[0] == '#')
	117	continue;
	118
	119	/* Trim trailing new-line character(s). */
	120	while (line[strlen(line) - 1] == '\r' \|\|
d1d7e268	121	line[strlen(line) - 1] == '\n')
645fb9cc TF	122	line[strlen(line) - 1] = '\0';
	123
	124	/* Split the line in two, separated by '=' */
	125	token = strchr(line, '=');
	126	if (token == NULL)
	127	continue;
	128
	129	key = line;
	130	value = token + 1;
	131	*token = '\0';
	132
	133	dup_value = strdup(value);
	134	if (dup_value == NULL) {
	135	rc = SA_NO_MEMORY;
	136	goto out;
	137	}
	138
	139	if (strcmp(key, "path") == 0)
	140	path = dup_value;
	141	if (strcmp(key, "comment") == 0)
	142	comment = dup_value;
	143	if (strcmp(key, "guest_ok") == 0)
	144	guest_ok = dup_value;
	145
	146	if (path == NULL \|\| comment == NULL \|\| guest_ok == NULL)
	147	continue; /* Incomplete share definition */
	148	else {
	149	shares = (smb_share_t *)
	150	malloc(sizeof (smb_share_t));
	151	if (shares == NULL) {
	152	rc = SA_NO_MEMORY;
	153	goto out;
	154	}
	155
	156	strncpy(shares->name, name,
	157	sizeof (shares->name));
d1d7e268	158	shares->name [sizeof (shares->name) - 1] = '\0';
645fb9cc TF	159
645fb9cc TF	160	strncpy(shares->path, path,
d1d7e268 MK	161	sizeof (shares->path));
d1d7e268 MK	162	shares->path [sizeof (shares->path) - 1] = '\0';
645fb9cc TF	163
645fb9cc TF	164	strncpy(shares->comment, comment,
d1d7e268 MK	165	sizeof (shares->comment));
	166	shares->comment[sizeof (shares->comment)-1] =
	167	'\0';
645fb9cc TF	168
	169	shares->guest_ok = atoi(guest_ok);
	170
	171	shares->next = new_shares;
	172	new_shares = shares;
	173
d1d7e268 MK	174	name = NULL;
	175	path = NULL;
	176	comment = NULL;
645fb9cc TF	177	guest_ok = NULL;
	178	}
	179	}
	180
	181	out:
	182	if (share_file_fp != NULL)
	183	fclose(share_file_fp);
	184
	185	free(name);
	186	free(path);
	187	free(comment);
	188	free(guest_ok);
	189	}
	190	closedir(shares_dir);
	191
	192	smb_shares = new_shares;
	193
d1d7e268	194	return (rc);
645fb9cc TF	195	}
645fb9cc TF	196
d1d7e268	197	/*
645fb9cc TF	198	* Used internally by smb_enable_share to enable sharing for a single host.
	199	*/
	200	static int
	201	smb_enable_share_one(const char sharename, const char sharepath)
	202	{
	203	char argv[10], pos;
	204	char name[SMB_NAME_MAX], comment[SMB_COMMENT_MAX];
	205	int rc;
	206
	207	/* Support ZFS share name regexp '[[:alnum:]_-.: ]' */
d1d7e268 MK	208	strncpy(name, sharename, sizeof (name));
d1d7e268 MK	209	name [sizeof (name)-1] = '\0';
645fb9cc TF	210
	211	pos = name;
	212	while (*pos != '\0') {
	213	switch (*pos) {
	214	case '/':
	215	case '-':
	216	case ':':
	217	case ' ':
	218	*pos = '_';
	219	}
	220
	221	++pos;
	222	}
	223
d1d7e268 MK	224	/*
	225	* CMD: net -S NET_CMD_ARG_HOST usershare add Test1 /share/Test1 \
	226	* "Comment" "Everyone:F"
	227	*/
	228	snprintf(comment, sizeof (comment), "Comment: %s", sharepath);
	229
	230	argv[0] = NET_CMD_PATH;
	231	argv[1] = (char *)"-S";
	232	argv[2] = NET_CMD_ARG_HOST;
	233	argv[3] = (char *)"usershare";
	234	argv[4] = (char *)"add";
	235	argv[5] = (char *)name;
	236	argv[6] = (char *)sharepath;
	237	argv[7] = (char *)comment;
645fb9cc TF	238	argv[8] = "Everyone:F";
	239	argv[9] = NULL;
	240
	241	rc = libzfs_run_process(argv[0], argv, 0);
	242	if (rc < 0)
d1d7e268	243	return (SA_SYSTEM_ERR);
645fb9cc TF	244
	245	/* Reload the share file */
	246	(void) smb_retrieve_shares();
	247
d1d7e268	248	return (SA_OK);
645fb9cc TF	249	}
645fb9cc TF	250
d1d7e268	251	/*
645fb9cc TF	252	* Enables SMB sharing for the specified share.
	253	*/
	254	static int
	255	smb_enable_share(sa_share_impl_t impl_share)
	256	{
	257	char *shareopts;
	258
	259	if (!smb_available())
d1d7e268	260	return (SA_SYSTEM_ERR);
645fb9cc TF	261
	262	shareopts = FSINFO(impl_share, smb_fstype)->shareopts;
	263	if (shareopts == NULL) /* on/off */
d1d7e268	264	return (SA_SYSTEM_ERR);
645fb9cc TF	265
645fb9cc TF	266	if (strcmp(shareopts, "off") == 0)
d1d7e268	267	return (SA_OK);
645fb9cc TF	268
645fb9cc TF	269	/* Magic: Enable (i.e., 'create new') share */
d1d7e268 MK	270	return (smb_enable_share_one(impl_share->dataset,
d1d7e268 MK	271	impl_share->sharepath));
645fb9cc TF	272	}
645fb9cc TF	273
d1d7e268	274	/*
645fb9cc TF	275	* Used internally by smb_disable_share to disable sharing for a single host.
	276	*/
	277	static int
	278	smb_disable_share_one(const char *sharename)
	279	{
	280	int rc;
	281	char *argv[7];
	282
	283	/* CMD: net -S NET_CMD_ARG_HOST usershare delete Test1 */
	284	argv[0] = NET_CMD_PATH;
d1d7e268	285	argv[1] = (char *)"-S";
645fb9cc	286	argv[2] = NET_CMD_ARG_HOST;
d1d7e268 MK	287	argv[3] = (char *)"usershare";
d1d7e268 MK	288	argv[4] = (char *)"delete";
645fb9cc TF	289	argv[5] = strdup(sharename);
	290	argv[6] = NULL;
	291
	292	rc = libzfs_run_process(argv[0], argv, 0);
	293	if (rc < 0)
d1d7e268	294	return (SA_SYSTEM_ERR);
645fb9cc	295	else
d1d7e268	296	return (SA_OK);
645fb9cc TF	297	}
645fb9cc TF	298
d1d7e268	299	/*
645fb9cc TF	300	* Disables SMB sharing for the specified share.
	301	*/
	302	static int
	303	smb_disable_share(sa_share_impl_t impl_share)
	304	{
	305	smb_share_t *shares = smb_shares;
	306
	307	if (!smb_available()) {
	308	/*
	309	* The share can't possibly be active, so nothing
	310	* needs to be done to disable it.
	311	*/
d1d7e268	312	return (SA_OK);
645fb9cc TF	313	}
	314
	315	while (shares != NULL) {
	316	if (strcmp(impl_share->sharepath, shares->path) == 0)
d1d7e268	317	return (smb_disable_share_one(shares->name));
645fb9cc TF	318
	319	shares = shares->next;
	320	}
	321
d1d7e268	322	return (SA_OK);
645fb9cc TF	323	}
645fb9cc TF	324
d1d7e268	325	/*
645fb9cc TF	326	* Checks whether the specified SMB share options are syntactically correct.
	327	*/
	328	static int
	329	smb_validate_shareopts(const char *shareopts)
	330	{
	331	/* TODO: Accept 'name' and sec/acl (?) */
	332	if ((strcmp(shareopts, "off") == 0) \|\| (strcmp(shareopts, "on") == 0))
d1d7e268	333	return (SA_OK);
645fb9cc	334
d1d7e268	335	return (SA_SYNTAX_ERR);
645fb9cc TF	336	}
645fb9cc TF	337
d1d7e268	338	/*
645fb9cc TF	339	* Checks whether a share is currently active.
	340	*/
	341	static boolean_t
	342	smb_is_share_active(sa_share_impl_t impl_share)
	343	{
	344	if (!smb_available())
d1d7e268	345	return (B_FALSE);
645fb9cc TF	346
	347	/* Retrieve the list of (possible) active shares */
	348	smb_retrieve_shares();
	349
	350	while (smb_shares != NULL) {
	351	if (strcmp(impl_share->sharepath, smb_shares->path) == 0)
d1d7e268	352	return (B_TRUE);
645fb9cc TF	353
	354	smb_shares = smb_shares->next;
	355	}
	356
d1d7e268	357	return (B_FALSE);
645fb9cc TF	358	}
645fb9cc TF	359
d1d7e268	360	/*
645fb9cc TF	361	* Called to update a share's options. A share's options might be out of
	362	* date if the share was loaded from disk and the "sharesmb" dataset
	363	* property has changed in the meantime. This function also takes care
	364	* of re-enabling the share if necessary.
	365	*/
	366	static int
	367	smb_update_shareopts(sa_share_impl_t impl_share, const char *resource,
	368	const char *shareopts)
	369	{
	370	char *shareopts_dup;
	371	boolean_t needs_reshare = B_FALSE;
	372	char *old_shareopts;
	373
d1d7e268 MK	374	if (!impl_share)
d1d7e268 MK	375	return (SA_SYSTEM_ERR);
645fb9cc TF	376
	377	FSINFO(impl_share, smb_fstype)->active =
	378	smb_is_share_active(impl_share);
	379
	380	old_shareopts = FSINFO(impl_share, smb_fstype)->shareopts;
	381
	382	if (FSINFO(impl_share, smb_fstype)->active && old_shareopts != NULL &&
	383	strcmp(old_shareopts, shareopts) != 0) {
	384	needs_reshare = B_TRUE;
	385	smb_disable_share(impl_share);
	386	}
	387
	388	shareopts_dup = strdup(shareopts);
	389
	390	if (shareopts_dup == NULL)
d1d7e268	391	return (SA_NO_MEMORY);
645fb9cc TF	392
	393	if (old_shareopts != NULL)
	394	free(old_shareopts);
	395
	396	FSINFO(impl_share, smb_fstype)->shareopts = shareopts_dup;
	397
	398	if (needs_reshare)
	399	smb_enable_share(impl_share);
	400
d1d7e268	401	return (SA_OK);
645fb9cc TF	402	}
645fb9cc TF	403
d1d7e268	404	/*
645fb9cc TF	405	* Clears a share's SMB options. Used by libshare to
	406	* clean up shares that are about to be free()'d.
	407	*/
	408	static void
	409	smb_clear_shareopts(sa_share_impl_t impl_share)
	410	{
	411	free(FSINFO(impl_share, smb_fstype)->shareopts);
	412	FSINFO(impl_share, smb_fstype)->shareopts = NULL;
	413	}
	414
	415	static const sa_share_ops_t smb_shareops = {
	416	.enable_share = smb_enable_share,
	417	.disable_share = smb_disable_share,
	418
	419	.validate_shareopts = smb_validate_shareopts,
	420	.update_shareopts = smb_update_shareopts,
	421	.clear_shareopts = smb_clear_shareopts,
	422	};
	423
	424	/*
	425	* Provides a convenient wrapper for determining SMB availability
	426	*/
	427	static boolean_t
	428	smb_available(void)
	429	{
be8bc8c0 TF	430	struct stat statbuf;
	431
	432	if (lstat(SHARE_DIR, &statbuf) != 0 \|\|
	433	!S_ISDIR(statbuf.st_mode))
d1d7e268	434	return (B_FALSE);
be8bc8c0 TF	435
be8bc8c0 TF	436	if (access(NET_CMD_PATH, F_OK) != 0)
d1d7e268	437	return (B_FALSE);
be8bc8c0	438
d1d7e268	439	return (B_TRUE);
645fb9cc TF	440	}
645fb9cc TF	441
d1d7e268	442	/*
645fb9cc TF	443	* Initializes the SMB functionality of libshare.
	444	*/
	445	void
	446	libshare_smb_init(void)
	447	{
	448	smb_fstype = register_fstype("smb", &smb_shareops);
	449	}