[mirror_zfs-debian.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 = NULL, *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) {
				free(path);
				path = dup_value;
			} else if (strcmp(key, "comment") == 0) {
				free(comment);
				comment = dup_value;
			} else if (strcmp(key, "guest_ok") == 0) {
				free(guest_ok);
				guest_ok = dup_value;
			} else
				free(dup_value);

			dup_value = NULL;

			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;
				}

				(void) strlcpy(shares->name, name,
				    sizeof (shares->name));

				(void) strlcpy(shares->path, path,
				    sizeof (shares->path));

				(void) strlcpy(shares->comment, comment,
				    sizeof (shares->comment));

				shares->guest_ok = atoi(guest_ok);

				shares->next = new_shares;
				new_shares = shares;

				free(path);
				free(comment);
				free(guest_ok);

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

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

		free(name);
		free(path);
		free(comment);
		free(guest_ok);

		name = NULL;
		path = NULL;
		comment = NULL;
		guest_ok = NULL;
	}
	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:]_-.: ]' */
	strlcpy(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)
{
	smb_share_t *iter = smb_shares;

	if (!smb_available())
		return (B_FALSE);

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

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

		iter = iter->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.
a08ee875	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
a08ee875	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;
cae5b340	75	char dup_value = NULL, path = NULL, comment = NULL, name = NULL;
645fb9cc TF	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)
a08ee875	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),
a08ee875	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) {
a08ee875 LG	111	rc = SA_NO_MEMORY;
a08ee875 LG	112	goto out;
645fb9cc TF	113	}
645fb9cc TF	114
a08ee875	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' \|\|
a08ee875	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
cae5b340 AX	139	if (strcmp(key, "path") == 0) {
cae5b340 AX	140	free(path);
645fb9cc	141	path = dup_value;
cae5b340 AX	142	} else if (strcmp(key, "comment") == 0) {
cae5b340 AX	143	free(comment);
645fb9cc	144	comment = dup_value;
cae5b340 AX	145	} else if (strcmp(key, "guest_ok") == 0) {
cae5b340 AX	146	free(guest_ok);
645fb9cc	147	guest_ok = dup_value;
cae5b340 AX	148	} else
	149	free(dup_value);
	150
	151	dup_value = NULL;
645fb9cc TF	152
	153	if (path == NULL \|\| comment == NULL \|\| guest_ok == NULL)
	154	continue; /* Incomplete share definition */
	155	else {
	156	shares = (smb_share_t *)
cae5b340	157	malloc(sizeof (smb_share_t));
645fb9cc TF	158	if (shares == NULL) {
	159	rc = SA_NO_MEMORY;
	160	goto out;
	161	}
	162
cae5b340 AX	163	(void) strlcpy(shares->name, name,
cae5b340 AX	164	sizeof (shares->name));
645fb9cc	165
cae5b340	166	(void) strlcpy(shares->path, path,
a08ee875	167	sizeof (shares->path));
645fb9cc	168
cae5b340	169	(void) strlcpy(shares->comment, comment,
a08ee875	170	sizeof (shares->comment));
645fb9cc TF	171
	172	shares->guest_ok = atoi(guest_ok);
	173
	174	shares->next = new_shares;
	175	new_shares = shares;
	176
cae5b340 AX	177	free(path);
	178	free(comment);
	179	free(guest_ok);
	180
a08ee875 LG	181	path = NULL;
a08ee875 LG	182	comment = NULL;
645fb9cc TF	183	guest_ok = NULL;
	184	}
	185	}
	186
	187	out:
cae5b340	188	if (share_file_fp != NULL) {
645fb9cc	189	fclose(share_file_fp);
cae5b340 AX	190	share_file_fp = NULL;
cae5b340 AX	191	}
645fb9cc TF	192
	193	free(name);
	194	free(path);
	195	free(comment);
	196	free(guest_ok);
cae5b340 AX	197
	198	name = NULL;
	199	path = NULL;
	200	comment = NULL;
	201	guest_ok = NULL;
645fb9cc TF	202	}
	203	closedir(shares_dir);
	204
	205	smb_shares = new_shares;
	206
a08ee875	207	return (rc);
645fb9cc TF	208	}
645fb9cc TF	209
a08ee875	210	/*
645fb9cc TF	211	* Used internally by smb_enable_share to enable sharing for a single host.
	212	*/
	213	static int
	214	smb_enable_share_one(const char sharename, const char sharepath)
	215	{
	216	char argv[10], pos;
	217	char name[SMB_NAME_MAX], comment[SMB_COMMENT_MAX];
	218	int rc;
	219
	220	/* Support ZFS share name regexp '[[:alnum:]_-.: ]' */
a07c8b41	221	strlcpy(name, sharename, sizeof (name));
a08ee875	222	name [sizeof (name)-1] = '\0';
645fb9cc TF	223
	224	pos = name;
	225	while (*pos != '\0') {
	226	switch (*pos) {
	227	case '/':
	228	case '-':
	229	case ':':
	230	case ' ':
	231	*pos = '_';
	232	}
	233
	234	++pos;
	235	}
	236
a08ee875 LG	237	/*
	238	* CMD: net -S NET_CMD_ARG_HOST usershare add Test1 /share/Test1 \
	239	* "Comment" "Everyone:F"
	240	*/
	241	snprintf(comment, sizeof (comment), "Comment: %s", sharepath);
	242
	243	argv[0] = NET_CMD_PATH;
	244	argv[1] = (char *)"-S";
	245	argv[2] = NET_CMD_ARG_HOST;
	246	argv[3] = (char *)"usershare";
	247	argv[4] = (char *)"add";
	248	argv[5] = (char *)name;
	249	argv[6] = (char *)sharepath;
	250	argv[7] = (char *)comment;
645fb9cc TF	251	argv[8] = "Everyone:F";
	252	argv[9] = NULL;
	253
	254	rc = libzfs_run_process(argv[0], argv, 0);
	255	if (rc < 0)
a08ee875	256	return (SA_SYSTEM_ERR);
645fb9cc TF	257
	258	/* Reload the share file */
	259	(void) smb_retrieve_shares();
	260
a08ee875	261	return (SA_OK);
645fb9cc TF	262	}
645fb9cc TF	263
a08ee875	264	/*
645fb9cc TF	265	* Enables SMB sharing for the specified share.
	266	*/
	267	static int
	268	smb_enable_share(sa_share_impl_t impl_share)
	269	{
	270	char *shareopts;
	271
	272	if (!smb_available())
a08ee875	273	return (SA_SYSTEM_ERR);
645fb9cc TF	274
	275	shareopts = FSINFO(impl_share, smb_fstype)->shareopts;
	276	if (shareopts == NULL) /* on/off */
a08ee875	277	return (SA_SYSTEM_ERR);
645fb9cc TF	278
645fb9cc TF	279	if (strcmp(shareopts, "off") == 0)
a08ee875	280	return (SA_OK);
645fb9cc TF	281
645fb9cc TF	282	/* Magic: Enable (i.e., 'create new') share */
a08ee875 LG	283	return (smb_enable_share_one(impl_share->dataset,
a08ee875 LG	284	impl_share->sharepath));
645fb9cc TF	285	}
645fb9cc TF	286
a08ee875	287	/*
645fb9cc TF	288	* Used internally by smb_disable_share to disable sharing for a single host.
	289	*/
	290	static int
	291	smb_disable_share_one(const char *sharename)
	292	{
	293	int rc;
	294	char *argv[7];
	295
	296	/* CMD: net -S NET_CMD_ARG_HOST usershare delete Test1 */
	297	argv[0] = NET_CMD_PATH;
a08ee875	298	argv[1] = (char *)"-S";
645fb9cc	299	argv[2] = NET_CMD_ARG_HOST;
a08ee875 LG	300	argv[3] = (char *)"usershare";
a08ee875 LG	301	argv[4] = (char *)"delete";
645fb9cc TF	302	argv[5] = strdup(sharename);
	303	argv[6] = NULL;
	304
	305	rc = libzfs_run_process(argv[0], argv, 0);
	306	if (rc < 0)
a08ee875	307	return (SA_SYSTEM_ERR);
645fb9cc	308	else
a08ee875	309	return (SA_OK);
645fb9cc TF	310	}
645fb9cc TF	311
a08ee875	312	/*
645fb9cc TF	313	* Disables SMB sharing for the specified share.
	314	*/
	315	static int
	316	smb_disable_share(sa_share_impl_t impl_share)
	317	{
	318	smb_share_t *shares = smb_shares;
	319
	320	if (!smb_available()) {
	321	/*
	322	* The share can't possibly be active, so nothing
	323	* needs to be done to disable it.
	324	*/
a08ee875	325	return (SA_OK);
645fb9cc TF	326	}
	327
	328	while (shares != NULL) {
	329	if (strcmp(impl_share->sharepath, shares->path) == 0)
a08ee875	330	return (smb_disable_share_one(shares->name));
645fb9cc TF	331
	332	shares = shares->next;
	333	}
	334
a08ee875	335	return (SA_OK);
645fb9cc TF	336	}
645fb9cc TF	337
a08ee875	338	/*
645fb9cc TF	339	* Checks whether the specified SMB share options are syntactically correct.
	340	*/
	341	static int
	342	smb_validate_shareopts(const char *shareopts)
	343	{
	344	/* TODO: Accept 'name' and sec/acl (?) */
	345	if ((strcmp(shareopts, "off") == 0) \|\| (strcmp(shareopts, "on") == 0))
a08ee875	346	return (SA_OK);
645fb9cc	347
a08ee875	348	return (SA_SYNTAX_ERR);
645fb9cc TF	349	}
645fb9cc TF	350
a08ee875	351	/*
645fb9cc TF	352	* Checks whether a share is currently active.
	353	*/
	354	static boolean_t
	355	smb_is_share_active(sa_share_impl_t impl_share)
	356	{
cae5b340 AX	357	smb_share_t *iter = smb_shares;
cae5b340 AX	358
645fb9cc	359	if (!smb_available())
a08ee875	360	return (B_FALSE);
645fb9cc TF	361
	362	/* Retrieve the list of (possible) active shares */
	363	smb_retrieve_shares();
	364
cae5b340 AX	365	while (iter != NULL) {
cae5b340 AX	366	if (strcmp(impl_share->sharepath, iter->path) == 0)
a08ee875	367	return (B_TRUE);
645fb9cc	368
cae5b340	369	iter = iter->next;
645fb9cc TF	370	}
645fb9cc TF	371
a08ee875	372	return (B_FALSE);
645fb9cc TF	373	}
645fb9cc TF	374
a08ee875	375	/*
645fb9cc TF	376	* Called to update a share's options. A share's options might be out of
	377	* date if the share was loaded from disk and the "sharesmb" dataset
	378	* property has changed in the meantime. This function also takes care
	379	* of re-enabling the share if necessary.
	380	*/
	381	static int
	382	smb_update_shareopts(sa_share_impl_t impl_share, const char *resource,
	383	const char *shareopts)
	384	{
	385	char *shareopts_dup;
	386	boolean_t needs_reshare = B_FALSE;
	387	char *old_shareopts;
	388
a08ee875 LG	389	if (!impl_share)
a08ee875 LG	390	return (SA_SYSTEM_ERR);
645fb9cc TF	391
	392	FSINFO(impl_share, smb_fstype)->active =
	393	smb_is_share_active(impl_share);
	394
	395	old_shareopts = FSINFO(impl_share, smb_fstype)->shareopts;
	396
	397	if (FSINFO(impl_share, smb_fstype)->active && old_shareopts != NULL &&
cae5b340	398	strcmp(old_shareopts, shareopts) != 0) {
645fb9cc TF	399	needs_reshare = B_TRUE;
	400	smb_disable_share(impl_share);
	401	}
	402
	403	shareopts_dup = strdup(shareopts);
	404
	405	if (shareopts_dup == NULL)
a08ee875	406	return (SA_NO_MEMORY);
645fb9cc TF	407
	408	if (old_shareopts != NULL)
	409	free(old_shareopts);
	410
	411	FSINFO(impl_share, smb_fstype)->shareopts = shareopts_dup;
	412
	413	if (needs_reshare)
	414	smb_enable_share(impl_share);
	415
a08ee875	416	return (SA_OK);
645fb9cc TF	417	}
645fb9cc TF	418
a08ee875	419	/*
645fb9cc TF	420	* Clears a share's SMB options. Used by libshare to
	421	* clean up shares that are about to be free()'d.
	422	*/
	423	static void
	424	smb_clear_shareopts(sa_share_impl_t impl_share)
	425	{
	426	free(FSINFO(impl_share, smb_fstype)->shareopts);
	427	FSINFO(impl_share, smb_fstype)->shareopts = NULL;
	428	}
	429
	430	static const sa_share_ops_t smb_shareops = {
	431	.enable_share = smb_enable_share,
	432	.disable_share = smb_disable_share,
	433
	434	.validate_shareopts = smb_validate_shareopts,
	435	.update_shareopts = smb_update_shareopts,
	436	.clear_shareopts = smb_clear_shareopts,
	437	};
	438
	439	/*
	440	* Provides a convenient wrapper for determining SMB availability
	441	*/
	442	static boolean_t
	443	smb_available(void)
	444	{
c06d4368 AX	445	struct stat statbuf;
	446
	447	if (lstat(SHARE_DIR, &statbuf) != 0 \|\|
	448	!S_ISDIR(statbuf.st_mode))
a08ee875	449	return (B_FALSE);
c06d4368 AX	450
c06d4368 AX	451	if (access(NET_CMD_PATH, F_OK) != 0)
a08ee875	452	return (B_FALSE);
c06d4368	453
a08ee875	454	return (B_TRUE);
645fb9cc TF	455	}
645fb9cc TF	456
a08ee875	457	/*
645fb9cc TF	458	* Initializes the SMB functionality of libshare.
	459	*/
	460	void
	461	libshare_smb_init(void)
	462	{
	463	smb_fstype = register_fstype("smb", &smb_shareops);
	464	}