xref: /titanic_51/usr/src/lib/libshare/common/libsharecore.c (revision 5cb0d67909d9970a3e7adbea9422ca3fc88000bf)

/*
 * 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) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2014 Nexenta Systems, Inc.  All rights reserved.
 */

/*
 * core library for common functions across all config store types
 * and file systems to be exported. This includes legacy dfstab/sharetab
 * parsing. Need to eliminate XML where possible.
 */

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <libxml/parser.h>
#include <libxml/tree.h>
#include "libshare.h"
#include "libshare_impl.h"
#include <fcntl.h>
#include <thread.h>
#include <grp.h>
#include <limits.h>
#include <sys/param.h>
#include <signal.h>
#include <libintl.h>
#include <dirent.h>

#include <sharefs/share.h>
#include "sharetab.h"

#define	DFSTAB_NOTICE_LINES	5
static char *notice[DFSTAB_NOTICE_LINES] =	{
	"# Do not modify this file directly.\n",
	"# Use the sharemgr(1m) command for all share management\n",
	"# This file is reconstructed and only maintained for backward\n",
	"# compatibility. Configuration lines could be lost.\n",
	"#\n"
};

#define	STRNCAT(x, y, z)	(xmlChar *)strncat((char *)x, (char *)y, z)

/* will be much smaller, but this handles bad syntax in the file */
#define	MAXARGSFORSHARE	256

static mutex_t sharetab_lock = DEFAULTMUTEX;
extern mutex_t sa_dfstab_lock;

/* used internally only */
typedef
struct sharelist {
    struct sharelist *next;
    int   persist;
    char *path;
    char *resource;
    char *fstype;
    char *options;
    char *description;
    char *group;
    char *origline;
    int lineno;
} xfs_sharelist_t;
static void parse_dfstab(sa_handle_t, char *, xmlNodePtr);
extern char *_sa_get_token(char *);
static void dfs_free_list(xfs_sharelist_t *);
/* prototypes */
void getlegacyconfig(sa_handle_t, char *, xmlNodePtr *);
extern sa_share_t _sa_add_share(sa_group_t, char *, int, int *, uint64_t);
extern sa_group_t _sa_create_group(sa_handle_impl_t, char *);
static void outdfstab(FILE *, xfs_sharelist_t *);
extern int _sa_remove_optionset(sa_optionset_t);
extern int set_node_share(void *, char *, char *);
extern void set_node_attr(void *, char *, char *);

/*
 * sablocksigs(*sigs)
 *
 * block important signals for a critical region. Arg is a pointer to
 * a sigset_t that is used later for the unblock.
 */
void
sablocksigs(sigset_t *sigs)
{
	sigset_t new;

	if (sigs != NULL) {
		(void) sigprocmask(SIG_BLOCK, NULL, &new);
		(void) sigaddset(&new, SIGHUP);
		(void) sigaddset(&new, SIGINT);
		(void) sigaddset(&new, SIGQUIT);
		(void) sigaddset(&new, SIGTSTP);
		(void) sigprocmask(SIG_SETMASK, &new, sigs);
	}
}

/*
 * saunblocksigs(*sigs)
 *
 * unblock previously blocked signals from the sigs arg.
 */
void
saunblocksigs(sigset_t *sigs)
{
	if (sigs != NULL)
		(void) sigprocmask(SIG_SETMASK, sigs, NULL);
}

/*
 * alloc_sharelist()
 *
 * allocator function to return an zfs_sharelist_t
 */

static xfs_sharelist_t *
alloc_sharelist()
{
	xfs_sharelist_t *item;

	item = (xfs_sharelist_t *)malloc(sizeof (xfs_sharelist_t));
	if (item != NULL)
		(void) memset(item, '\0', sizeof (xfs_sharelist_t));
	return (item);
}

/*
 * fix_notice(list)
 *
 * Look at the beginning of the current /etc/dfs/dfstab file and add
 * the do not modify notice if it doesn't exist.
 */

static xfs_sharelist_t *
fix_notice(xfs_sharelist_t *list)
{
	xfs_sharelist_t *item, *prev;
	int i;

	if (list == NULL) {
		/* zero length dfstab */
		list = alloc_sharelist();
		if (list == NULL)
			return (NULL);
		list->description = strdup("#\n");
	}
	if (list->path == NULL && list->description != NULL &&
	    strcmp(list->description, notice[0]) != 0) {
		for (prev = NULL, i = 0; i < DFSTAB_NOTICE_LINES; i++) {
			item = alloc_sharelist();
			if (item != NULL) {
				item->description = strdup(notice[i]);
				if (prev == NULL) {
					item->next = list;
					prev = item;
					list = item;
				} else {
					item->next = prev->next;
					prev->next = item;
					prev = item;
				}
			}
		}
	}
	return (list);
}

/*
 * getdfstab(dfs)
 *
 * Returns an zfs_sharelist_t list of lines from the dfstab file
 * pointed to by the FILE pointer dfs. Each entry is parsed and the
 * original line is also preserved. Used in parsing and updating the
 * dfstab file.
 */

static xfs_sharelist_t *
getdfstab(FILE *dfs)
{
	char buff[_POSIX_ARG_MAX]; /* reasonable size given syntax of share */
	char *bp;
	char *token;
	char *args[MAXARGSFORSHARE];
	int argc;
	int c;
	static int line = 0;
	xfs_sharelist_t *item = NULL, *first = NULL, *last;

	if (dfs != NULL) {
		first = NULL;
		line = 0;
		while (fgets(buff, sizeof (buff), dfs) != NULL) {
			line++;
			bp = buff;
			if (buff[0] == '#') {
				item = alloc_sharelist();
				if (item != NULL) {
					/* if no path, then comment */
					item->lineno = line;
					item->description = strdup(buff);
					if (first == NULL) {
						first = item;
						last = item;
					} else {
						last->next = item;
						last = item;
					}
				} else {
					break;
				}
				continue;
			} else if (buff[0] == '\n') {
				continue;
			}
			optind = 1;
			item = alloc_sharelist();
			if (item == NULL) {
				break;
			} else if (first == NULL) {
				first = item;
				last = item;
			} else {
				last->next = item;
				last = item;
			}
			item->lineno = line;
			item->origline = strdup(buff);
			(void) _sa_get_token(NULL); /* reset to new pointers */
			argc = 0;
			while ((token = _sa_get_token(bp)) != NULL) {
				if (argc < MAXARGSFORSHARE)
					args[argc++] = token;
			}
			while ((c = getopt(argc, args, "F:o:d:pg:")) != -1) {
				switch (c) {
				case 'p':
					item->persist = 1;
					break;
				case 'F':
					item->fstype = strdup(optarg);
					break;
				case 'o':
					item->options = strdup(optarg);
					break;
				case 'd':
					item->description = strdup(optarg);
					break;
				case 'g':
					item->group = strdup(optarg);
					break;
				default:
					break;
				}
			}
			if (optind < argc) {
				item->path = strdup(args[optind]);
				optind++;
				if (optind < argc) {
					char *resource;
					char *optgroup;
					/* resource and/or groupname */
					resource = args[optind];
					optgroup = strchr(resource, '@');
					if (optgroup != NULL)
						*optgroup++ = '\0';
					if (optgroup != NULL)
						item->group = strdup(optgroup);
					if (resource != NULL &&
					    strlen(resource) > 0)
						item->resource =
						    strdup(resource);
				}
			}
			/* NFS is the default if none defined */
			if (item != NULL && item->fstype == NULL)
				item->fstype = strdup("nfs");
		}
	}
	first = fix_notice(first);
	return (first);
}

/*
 * finddfsentry(list, path)
 *
 * Look for path in the zfs_sharelist_t list and return the entry if it
 * exists.
 */

static xfs_sharelist_t *
finddfsentry(xfs_sharelist_t *list, char *path)
{
	xfs_sharelist_t *item;

	for (item = list; item != NULL; item = item->next) {
		if (item->path != NULL && strcmp(item->path, path) == 0)
		return (item);
	}
	return (NULL);
}

/*
 * remdfsentry(list, path, proto)
 *
 * Remove the specified path (with protocol) from the list. This will
 * remove it from dfstab when the file is rewritten.
 */

static xfs_sharelist_t *
remdfsentry(xfs_sharelist_t *list, char *path, char *proto)
{
	xfs_sharelist_t *item, *prev = NULL;


	for (item = prev = list; item != NULL; item = item->next) {
	    /* skip comment entry but don't lose it */
		if (item->path == NULL) {
			prev = item;
			continue;
		}
		/* if proto is NULL, remove all protocols */
		if (proto == NULL || (strcmp(item->path, path) == 0 &&
		    (item->fstype != NULL && strcmp(item->fstype, proto) == 0)))
			break;
		if (item->fstype == NULL &&
		    (proto == NULL || strcmp(proto, "nfs") == 0))
			break;
		prev = item;
	}
	if (item != NULL) {
		if (item == prev)
			list = item->next; /* this must be the first one */
		else
			prev->next = item->next;
		item->next = NULL;
		dfs_free_list(item);
	}
	return (list);
}

/*
 * remdfsline(list, line)
 *
 * Remove the line specified from the list.
 */

static xfs_sharelist_t *
remdfsline(xfs_sharelist_t *list, char *line)
{
	xfs_sharelist_t *item, *prev = NULL;

	for (item = prev = list; item != NULL; item = item->next) {
		/* skip comment entry but don't lose it */
		if (item->path == NULL) {
		prev = item;
		continue;
		}
		if (strcmp(item->origline, line) == 0)
			break;
		prev = item;
	}
	if (item != NULL) {
		if (item == prev)
			list = item->next; /* this must be the first one */
		else
			prev->next = item->next;
		item->next = NULL;
		dfs_free_list(item);
	}
	return (list);
}

/*
 * adddfsentry(list, share, proto)
 *
 * Add an entry to the dfstab list for share (relative to proto). This
 * is used to update dfstab for legacy purposes.
 */

static xfs_sharelist_t *
adddfsentry(xfs_sharelist_t *list, sa_share_t share, char *proto)
{
	xfs_sharelist_t *item, *tmp;
	sa_group_t parent;
	char *groupname;

	item = alloc_sharelist();
	if (item != NULL) {
		parent = sa_get_parent_group(share);
		groupname = sa_get_group_attr(parent, "name");
		if (groupname != NULL && strcmp(groupname, "default") == 0) {
			sa_free_attr_string(groupname);
			groupname = NULL;
		}
		item->path = sa_get_share_attr(share, "path");
		item->resource = sa_get_share_attr(share, "resource");
		item->group = groupname;
		item->fstype = strdup(proto);
		item->options = sa_proto_legacy_format(proto, share, 1);
		if (item->options != NULL && strlen(item->options) == 0) {
			free(item->options);
			item->options = NULL;
		}
		item->description = sa_get_share_description(share);
		if (item->description != NULL &&
		    strlen(item->description) == 0) {
			sa_free_share_description(item->description);
			item->description = NULL;
		}
		if (list == NULL) {
			list = item;
		} else {
			for (tmp = list; tmp->next != NULL; tmp = tmp->next)
				/* do nothing */;
				tmp->next = item;
		}
	}
	return (list);
}

/*
 * outdfstab(dfstab, list)
 *
 * Output the list to dfstab making sure the file is truncated.
 * Comments and errors are preserved.
 */

static void
outdfstab(FILE *dfstab, xfs_sharelist_t *list)
{
	xfs_sharelist_t *item;

	(void) ftruncate(fileno(dfstab), 0);

	for (item = list; item != NULL; item = item->next) {
		if (item->path != NULL) {
			if (*item->path == '/') {
				(void) fprintf(dfstab,
				    "share %s%s%s%s%s%s%s %s%s%s%s%s\n",
				    (item->fstype != NULL) ? "-F " : "",
				    (item->fstype != NULL) ? item->fstype : "",
				    (item->options != NULL) ? " -o " : "",
				    (item->options != NULL) ?
				    item->options : "",
				    (item->description != NULL) ?
				    " -d \"" : "",
				    (item->description != NULL) ?
				    item->description : "",
				    (item->description != NULL) ? "\"" : "",
				    item->path,
				    ((item->resource != NULL) ||
				    (item->group != NULL)) ? " " : "",
				    (item->resource != NULL) ?
				    item->resource : "",
				    item->group != NULL ? "@" : "",
				    item->group != NULL ? item->group : "");
			} else {
				(void) fprintf(dfstab, "%s", item->origline);
			}
		} else {
			if (item->description != NULL)
				(void) fprintf(dfstab, "%s", item->description);
			else
				(void) fprintf(dfstab, "%s", item->origline);
		}
	}
}

/*
 * open_dfstab(file)
 *
 * Open the specified dfstab file. If the owner/group/perms are wrong,
 * fix them.
 */

static FILE *
open_dfstab(char *file)
{
	struct group *grp;
	struct group group;
	char *buff;
	int grsize;
	FILE *dfstab;

	dfstab = fopen(file, "r+");
	if (dfstab == NULL) {
		dfstab = fopen(file, "w+");
	}
	if (dfstab != NULL) {
		grsize = sysconf(_SC_GETGR_R_SIZE_MAX);
		buff = malloc(grsize);
		if (buff != NULL)
			grp = getgrnam_r(SA_DEFAULT_FILE_GRP, &group, buff,
			    grsize);
		else
			grp = getgrnam(SA_DEFAULT_FILE_GRP);
		(void) fchmod(fileno(dfstab), 0644);
		(void) fchown(fileno(dfstab), 0,
		    grp != NULL ? grp->gr_gid : 3);
		if (buff != NULL)
			free(buff);
		rewind(dfstab);
	}
	return (dfstab);
}

/*
 * sa_comment_line(line, err)
 *
 * Add a comment to the dfstab file with err as a prefix to the
 * original line.
 */

static void
sa_comment_line(char *line, char *err)
{
	FILE *dfstab;
	xfs_sharelist_t *list;
	sigset_t old;

	dfstab = open_dfstab(SA_LEGACY_DFSTAB);
	if (dfstab != NULL) {
		(void) setvbuf(dfstab, NULL, _IOLBF, BUFSIZ * 8);
		sablocksigs(&old);
		(void) lockf(fileno(dfstab), F_LOCK, 0);
		(void) mutex_lock(&sa_dfstab_lock);
		list = getdfstab(dfstab);
		rewind(dfstab);
		/*
		 * don't ignore the return since the list could have
		 * gone to NULL if the file only had one line in it.
		 */
		list = remdfsline(list, line);
		outdfstab(dfstab, list);
		(void) fprintf(dfstab, "# Error: %s: %s", err, line);
		(void) fsync(fileno(dfstab));
		(void) mutex_unlock(&sa_dfstab_lock);
		(void) lockf(fileno(dfstab), F_ULOCK, 0);
		(void) fclose(dfstab);
		saunblocksigs(&old);
		if (list != NULL)
			dfs_free_list(list);
	}
}

/*
 * sa_delete_legacy(share, protocol)
 *
 * Delete the specified share from the legacy config file.
 */

int
sa_delete_legacy(sa_share_t share, char *protocol)
{
	FILE *dfstab;
	int err;
	int ret = SA_OK;
	xfs_sharelist_t *list;
	char *path;
	sa_optionset_t optionset;
	sa_group_t parent;
	sigset_t old;

	/*
	 * Protect against shares that don't have paths. This is not
	 * really an error at this point.
	 */
	path = sa_get_share_attr(share, "path");
	if (path == NULL)
		return (ret);

	dfstab = open_dfstab(SA_LEGACY_DFSTAB);
	if (dfstab != NULL) {
		(void) setvbuf(dfstab, NULL, _IOLBF, BUFSIZ * 8);
		sablocksigs(&old);
		parent = sa_get_parent_group(share);
		if (parent != NULL) {
			(void) lockf(fileno(dfstab), F_LOCK, 0);
			(void) mutex_lock(&sa_dfstab_lock);
			list = getdfstab(dfstab);
			rewind(dfstab);
			if (protocol != NULL) {
				if (list != NULL)
					list = remdfsentry(list, path,
					    protocol);
			} else {
				for (optionset = sa_get_optionset(parent, NULL);
				    optionset != NULL;
				    optionset =
				    sa_get_next_optionset(optionset)) {
					char *proto = sa_get_optionset_attr(
					    optionset, "type");

					if (list != NULL && proto != NULL)
						list = remdfsentry(list, path,
						    proto);
					if (proto == NULL)
						ret = SA_NO_MEMORY;
					/*
					 * may want to only do the dfstab if
					 * this call returns NOT IMPLEMENTED
					 * but it shouldn't hurt.
					 */
					if (ret == SA_OK) {
						err = sa_proto_delete_legacy(
						    proto, share);
						if (err != SA_NOT_IMPLEMENTED)
							ret = err;
					}
					if (proto != NULL)
						sa_free_attr_string(proto);
				}
			}
			outdfstab(dfstab, list);
			if (list != NULL)
				dfs_free_list(list);
			(void) fflush(dfstab);
			(void) mutex_unlock(&sa_dfstab_lock);
			(void) lockf(fileno(dfstab), F_ULOCK, 0);
		}
		(void) fsync(fileno(dfstab));
		saunblocksigs(&old);
		(void) fclose(dfstab);
	} else {
		if (errno == EACCES || errno == EPERM)
			ret = SA_NO_PERMISSION;
		else
			ret = SA_CONFIG_ERR;
	}

	if (path != NULL)
		sa_free_attr_string(path);

	return (ret);
}

/*
 * sa_update_legacy(share, proto)
 *
 * There is an assumption that dfstab will be the most common form of
 * legacy configuration file for shares, but not the only one. Because
 * of that, dfstab handling is done in the main code with calls to
 * this function and protocol specific calls to deal with formatting
 * options into dfstab/share compatible syntax. Since not everything
 * will be dfstab, there is a provision for calling a protocol
 * specific plugin interface that allows the protocol plugin to do its
 * own legacy files and skip the dfstab update.
 */

int
sa_update_legacy(sa_share_t share, char *proto)
{
	FILE *dfstab;
	int ret = SA_OK;
	xfs_sharelist_t *list;
	char *path;
	sigset_t old;
	char *persist;
	uint64_t features;

	ret = sa_proto_update_legacy(proto, share);
	if (ret != SA_NOT_IMPLEMENTED)
		return (ret);

	features = sa_proto_get_featureset(proto);
	if (!(features & SA_FEATURE_DFSTAB))
		return (ret);

	/* do the dfstab format */
	persist = sa_get_share_attr(share, "type");
	/*
	 * only update if the share is not transient -- no share type
	 * set or the type is not "transient".
	 */
	if (persist == NULL || strcmp(persist, "transient") != 0) {
		path = sa_get_share_attr(share, "path");
		if (path == NULL) {
			ret = SA_NO_MEMORY;
			goto out;
		}
		dfstab = open_dfstab(SA_LEGACY_DFSTAB);
		if (dfstab != NULL) {
			(void) setvbuf(dfstab, NULL, _IOLBF, BUFSIZ * 8);
			sablocksigs(&old);
			(void) lockf(fileno(dfstab), F_LOCK, 0);
			(void) mutex_lock(&sa_dfstab_lock);
			list = getdfstab(dfstab);
			rewind(dfstab);
			if (list != NULL)
				list = remdfsentry(list, path, proto);
			list = adddfsentry(list, share, proto);
			outdfstab(dfstab, list);
			(void) fflush(dfstab);
			(void) mutex_unlock(&sa_dfstab_lock);
			(void) lockf(fileno(dfstab), F_ULOCK, 0);
			(void) fsync(fileno(dfstab));
			saunblocksigs(&old);
			(void) fclose(dfstab);
			if (list != NULL)
				dfs_free_list(list);
		} else {
			if (errno == EACCES || errno == EPERM)
				ret = SA_NO_PERMISSION;
			else
				ret = SA_CONFIG_ERR;
		}
		sa_free_attr_string(path);
	}
out:
	if (persist != NULL)
		sa_free_attr_string(persist);
	return (ret);
}

/*
 * sa_is_security(optname, proto)
 *
 * Check to see if optname is a security (named optionset) specific
 * property for the specified protocol.
 */

int
sa_is_security(char *optname, char *proto)
{
	int ret = 0;
	if (proto != NULL)
		ret = sa_proto_security_prop(proto, optname);
	return (ret);
}

/*
 * add_syntax_comment(root, line, err, todfstab)
 *
 * Add a comment to the document indicating a syntax error. If
 * todfstab is set, write it back to the dfstab file as well.
 */

static void
add_syntax_comment(xmlNodePtr root, char *line, char *err, int todfstab)
{
	xmlNodePtr node;

	node = xmlNewChild(root, NULL, (xmlChar *)"error", (xmlChar *)line);
	if (node != NULL)
		(void) xmlSetProp(node, (xmlChar *)"type", (xmlChar *)err);
	if (todfstab)
		sa_comment_line(line, err);
}

/*
 * sa_is_share(object)
 *
 * returns true if the object is of type "share".
 */

int
sa_is_share(void *object)
{
	if (object != NULL) {
		if (strcmp((char *)((xmlNodePtr)object)->name, "share") == 0)
		return (1);
	}
	return (0);
}
/*
 * sa_is_resource(object)
 *
 * returns true if the object is of type "resource".
 */

int
sa_is_resource(void *object)
{
	if (object != NULL) {
		if (strcmp((char *)((xmlNodePtr)object)->name, "resource") == 0)
			return (1);
	}
	return (0);
}

/*
 * _sa_remove_property(property)
 *
 * remove a property only from the document.
 */

static void
_sa_remove_property(sa_property_t property)
{
	xmlUnlinkNode((xmlNodePtr)property);
	xmlFreeNode((xmlNodePtr)property);
}

/*
 * _sa_create_dummy_share()
 *
 * Create a share entry suitable for parsing but not tied to any real
 * config tree.  Need to have a parent as well as the node to parse
 * on.  Free using _sa_free_dummy_share(share);
 */

static sa_group_t
_sa_create_dummy_share()
{
	xmlNodePtr parent_node = NULL;
	xmlNodePtr child_node = NULL;

	parent_node = xmlNewNode(NULL, (xmlChar *)"group");
	if (parent_node != NULL) {
		child_node = xmlNewChild(parent_node, NULL, (xmlChar *)"share",
		    NULL);
		if (child_node != NULL) {
			/*
			 * Use a "zfs" tag since that will make sure nothing
			 * really attempts to put values into the
			 * repository. Also ZFS is currently the only user of
			 * this interface.
			 */
			set_node_attr(parent_node, "type", "transient");
			set_node_attr(parent_node, "zfs", "true");
			set_node_attr(child_node, "type", "transient");
			set_node_attr(child_node, "zfs", "true");
		} else {
			xmlFreeNode(parent_node);
		}
	}
	return (child_node);
}

/*
 * _sa_free_dummy_share(share)
 *
 * Free the dummy share and its parent.  It is an error to try and
 * free something that isn't a dummy.
 */

static int
_sa_free_dummy_share(sa_share_t share)
{
	xmlNodePtr node = (xmlNodePtr)share;
	xmlNodePtr parent;
	int ret = SA_OK;
	char *name;

	if (node != NULL) {
		parent = node->parent;
		name = (char *)xmlGetProp(node, (xmlChar *)"path");
		if (name != NULL) {
			/* Real shares always have a path but a dummy doesn't */
			ret = SA_NOT_ALLOWED;
			sa_free_attr_string(name);
		} else {
			/*
			 * If there is a parent, do the free on that since
			 * xmlFreeNode is a recursive function and free's an
			 * child nodes.
			 */
			if (parent != NULL) {
				node = parent;
			}
			xmlUnlinkNode(node);
			xmlFreeNode(node);
		}
	}
	return (ret);
}


/*
 * sa_parse_legacy_options(group, options, proto)
 *
 * In order to support legacy configurations, we allow the protocol
 * specific plugin to parse legacy syntax options (like those in
 * /etc/dfs/dfstab). This adds a new optionset to the group (or
 * share).
 *
 * Once the optionset has been created, we then get the derived
 * optionset of the parent (options from the optionset of the parent
 * and any parent it might have) and remove those from the created
 * optionset. This avoids duplication of options.
 */

int
sa_parse_legacy_options(sa_group_t group, char *options, char *proto)
{
	int ret = SA_INVALID_PROTOCOL;
	sa_group_t parent;
	int using_dummy = B_FALSE;
	char *pvalue;
	sa_optionset_t optionset;
	sa_property_t popt, prop;
	sa_optionset_t localoptions;

	/*
	 * If "group" is NULL, this is just a parse without saving
	 * anything in either SMF or ZFS.  Create a dummy group to
	 * handle this case.
	 */
	if (group == NULL) {
		group = (sa_group_t)_sa_create_dummy_share();
		using_dummy = B_TRUE;
	}

	parent = sa_get_parent_group(group);

	if (proto != NULL)
		ret = sa_proto_legacy_opts(proto, group, options);

	if (using_dummy) {
		/* Since this is a dummy parse, cleanup and quit here */
		(void) _sa_free_dummy_share(parent);
		return (ret);
	}

	if (ret != SA_OK)
		return (ret);

	/*
	 * If in a group, remove the inherited options and security
	 */

	if (parent == NULL)
		return (ret);

	/* Find parent options to remove from child */
	optionset = sa_get_derived_optionset(parent, proto, 1);
	localoptions = sa_get_optionset(group, proto);
	if (optionset != NULL) {
		for (popt = sa_get_property(optionset, NULL);
		    popt != NULL;
		    popt = sa_get_next_property(popt)) {
			char *tag;
			char *value;
			tag = sa_get_property_attr(popt, "type");
			if (tag == NULL)
				continue;
			prop = sa_get_property(localoptions, tag);
			if (prop != NULL) {
				value = sa_get_property_attr(popt,
				    "value");
				pvalue = sa_get_property_attr(prop,
				    "value");
				if (value != NULL && pvalue != NULL &&
				    strcmp(value, pvalue) == 0) {
					/*
					 * Remove the property
					 * from the
					 * child. While we
					 * removed it, we
					 * don't need to reset
					 * as we do below
					 * since we always
					 * search from the
					 * beginning.
					 */
					(void) _sa_remove_property(
					    prop);
				}
				if (value != NULL)
					sa_free_attr_string(value);
				if (pvalue != NULL)
					sa_free_attr_string(pvalue);
			}
			sa_free_attr_string(tag);
		}
		prop = sa_get_property(localoptions, NULL);
		if (prop == NULL && sa_is_share(group)) {
			/*
			 * All properties removed so remove the
			 * optionset if it is on a share
			 */
			(void) _sa_remove_optionset(localoptions);
		}
		sa_free_derived_optionset(optionset);
	}
	/*
	 * Need to remove security here. If there are no
	 * security options on the local group/share, don't
	 * bother since those are the only ones that would be
	 * affected.
	 */
	localoptions = sa_get_all_security_types(group, proto, 0);
	if (localoptions != NULL) {
		for (prop = sa_get_property(localoptions, NULL);
		    prop != NULL;
		    prop = sa_get_next_property(prop)) {
			char *tag;
			sa_security_t security;
			tag = sa_get_property_attr(prop, "type");
			if (tag != NULL) {
				sa_property_t nextpopt = NULL;
				security = sa_get_security(group, tag, proto);
				sa_free_attr_string(tag);
				/*
				 * prop's value only changes outside this loop
				 */
				pvalue = sa_get_property_attr(prop, "value");
				for (popt = sa_get_property(security, NULL);
				    popt != NULL;
				    popt = nextpopt) {
					char *value;
					/*
					 * Need to get the next prop
					 * now since we could break
					 * the list during removal.
					 */
					nextpopt = sa_get_next_property(popt);
					/* remove Duplicates from this level */
					value = sa_get_property_attr(popt,
					    "value");
					if (value != NULL && pvalue != NULL &&
					    strcmp(value, pvalue) == 0) {
						/*
						 * remove the property
						 * from the child
						 */
						(void) _sa_remove_property
						    (popt);
					}
					if (value != NULL)
						sa_free_attr_string(value);
				}
				if (pvalue != NULL)
					sa_free_attr_string(pvalue);
			}
		}
		(void) sa_destroy_optionset(localoptions);
	}
	return (ret);
}

/*
 * dfs_free_list(list)
 *
 * Free the data in each list entry of the list as well as freeing the
 * entries themselves. We need to avoid memory leaks and don't want to
 * dereference any NULL members.
 */

static void
dfs_free_list(xfs_sharelist_t *list)
{
	xfs_sharelist_t *entry;
	for (entry = list; entry != NULL; entry = list) {
		if (entry->path != NULL)
			free(entry->path);
		if (entry->resource != NULL)
			free(entry->resource);
		if (entry->fstype != NULL)
			free(entry->fstype);
		if (entry->options != NULL)
			free(entry->options);
		if (entry->description != NULL)
			free(entry->description);
		if (entry->origline != NULL)
			free(entry->origline);
		if (entry->group != NULL)
			free(entry->group);
		list = list->next;
			free(entry);
	}
}

/*
 * parse_dfstab(dfstab, root)
 *
 * Open and read the existing dfstab, parsing each line and adding it
 * to the internal configuration. Make sure syntax errors, etc are
 * preserved as comments.
 */

static void
parse_dfstab(sa_handle_t handle, char *dfstab, xmlNodePtr root)
{
	sa_share_t share;
	sa_group_t group;
	sa_group_t sgroup = NULL;
	sa_group_t defgroup;
	xfs_sharelist_t *head, *list;
	int err;
	int defined_group;
	FILE *dfs;
	char *oldprops;

	/* read the dfstab format file and fill in the doc tree */

	dfs = fopen(dfstab, "r");
	if (dfs == NULL)
		return;

	defgroup = sa_get_group(handle, "default");

	for (head = list = getdfstab(dfs);
	    list != NULL;
	    list = list->next) {
		share = NULL;
		group = NULL;
		defined_group = 0;
		err = 0;

		if (list->origline == NULL) {
			/*
			 * Comment line that we will likely skip.
			 * If the line has the syntax:
			 *	# error: string: string
			 * It should be preserved until manually deleted.
			 */
			if (list->description != NULL &&
			    strncmp(list->description, "# Error: ", 9) == 0) {
				char *line;
				char *error;
				char *cmd;
				line = strdup(list->description);
				if (line != NULL) {
					error = line + 9;
					cmd = strchr(error, ':');
					if (cmd != NULL) {
						int len;
						*cmd = '\0';
						cmd += 2;
						len = strlen(cmd);
						cmd[len - 1] = '\0';
						add_syntax_comment(root, cmd,
						    error, 0);
					}
					free(line);
				}
			}
			continue;
		}
		if (list->path != NULL && strlen(list->path) > 0 &&
		    *list->path == '/') {
			share = sa_find_share(handle, list->path);
			if (share != NULL)
				sgroup = sa_get_parent_group(share);
			else
				sgroup = NULL;
		} else {
			(void) printf(dgettext(TEXT_DOMAIN,
			    "No share specified in dfstab: "
			    "line %d: %s\n"),
			    list->lineno, list->origline);
			add_syntax_comment(root, list->origline,
			    dgettext(TEXT_DOMAIN, "No share specified"), 1);
			continue;
		}
		if (list->group != NULL && strlen(list->group) > 0) {
			group = sa_get_group(handle, list->group);
			defined_group = 1;
		} else {
			group = defgroup;
		}
		if (defined_group && group == NULL) {
			(void) printf(dgettext(TEXT_DOMAIN,
			    "Unknown group used in dfstab: line %d: %s\n"),
			    list->lineno, list->origline);
			add_syntax_comment(root, list->origline,
			    dgettext(TEXT_DOMAIN, "Unknown group specified"),
			    1);
			continue;
		}
		if (group == NULL) {
			/* Shouldn't happen unless an SMF error */
			err = SA_CONFIG_ERR;
			continue;
		}
		if (share == NULL) {
			if (defined_group || group != defgroup)
				continue;
			/* This is an OK add for legacy */
			share = sa_add_share(defgroup, list->path,
			    SA_SHARE_PERMANENT | SA_SHARE_PARSER, &err);
			if (share != NULL) {
				if (list->description != NULL &&
				    strlen(list->description) > 0)
					(void) sa_set_share_description(share,
					    list->description);
				if (list->options != NULL &&
				    strlen(list->options) > 0) {
					(void) sa_parse_legacy_options(share,
					    list->options, list->fstype);
				}
				if (list->resource != NULL)
					(void) sa_set_share_attr(share,
					    "resource", list->resource);
			} else {
				(void) printf(dgettext(TEXT_DOMAIN,
				    "Error in dfstab: line %d: %s\n"),
				    list->lineno, list->origline);
				if (err != SA_BAD_PATH)
					add_syntax_comment(root, list->origline,
					    dgettext(TEXT_DOMAIN, "Syntax"), 1);
				else
					add_syntax_comment(root, list->origline,
					    dgettext(TEXT_DOMAIN,
					    "Path"), 1);
				continue;
			}
		} else {
			if (group != sgroup) {
				(void) printf(dgettext(TEXT_DOMAIN,
				    "Attempt to change configuration in "
				    "dfstab: line %d: %s\n"),
				    list->lineno, list->origline);
				add_syntax_comment(root, list->origline,
				    dgettext(TEXT_DOMAIN,
				    "Attempt to change configuration"), 1);
				continue;
			}
			/*
			 * It is the same group but could have changed
			 * options. Make sure we include the group's
			 * properties so we don't end up moving them to
			 * the share inadvertantly. The last arg being
			 * true says to get the inherited properties as well
			 * as the local properties.
			 */
			oldprops = sa_proto_legacy_format(list->fstype, share,
			    B_TRUE);

			if (oldprops == NULL)
				continue;

			if (list->options != NULL &&
			    strcmp(oldprops, list->options) != 0) {
				sa_optionset_t opts;
				sa_security_t secs;

				/* possibly different values */
				opts = sa_get_optionset((sa_group_t)
				    share, list->fstype);
				(void) sa_destroy_optionset(opts);

				for (secs = sa_get_security(
				    (sa_group_t)share, NULL, list->fstype);
				    secs != NULL;
				    secs = sa_get_security((sa_group_t)share,
				    NULL, list->fstype)) {
					(void) sa_destroy_security(
					    secs);
				}
				(void) sa_parse_legacy_options(share,
				    list->options, list->fstype);
			}
			sa_format_free(oldprops);
		}
	}
	dfs_free_list(head);
}

/*
 * legacy_removes(group, file)
 *
 * Find any shares that are "missing" from the legacy file. These
 * should be removed from the configuration since they are likely from
 * a legacy app or the admin modified the dfstab file directly. We
 * have to support this even if it is not the recommended way to do
 * things.
 */

static void
legacy_removes(sa_group_t group, char *file)
{
	sa_share_t share;
	char *path;
	xfs_sharelist_t *list, *item;
	FILE *dfstab;

	dfstab = fopen(file, "r");
	if (dfstab != NULL) {
		list = getdfstab(dfstab);
		(void) fclose(dfstab);
retry:
		for (share = sa_get_share(group, NULL);
		    share != NULL;
		    share = sa_get_next_share(share)) {
			/* now see if the share is in the dfstab file */
			path = sa_get_share_attr(share, "path");
			if (path != NULL) {
				item = finddfsentry(list, path);
				sa_free_attr_string(path);
				if (item == NULL) {
					/* The share was removed this way */
					(void) sa_remove_share(share);

					/*
					 * Start over since the list was broken
					 */
					goto retry;
				}
			}
		}
		if (list != NULL)
			dfs_free_list(list);
	}
}

/*
 * getlegacyconfig(path, root)
 *
 * Parse dfstab and build the legacy configuration. This only gets
 * called when a change was detected.
 */

void
getlegacyconfig(sa_handle_t handle, char *path, xmlNodePtr *root)
{
	sa_group_t defgroup;

	if (root != NULL) {
		if (*root == NULL)
			*root = xmlNewNode(NULL, (xmlChar *)"sharecfg");
		if (*root != NULL) {
			if (strcmp(path, SA_LEGACY_DFSTAB) == 0) {
				/*
				 * Walk the default shares and find anything
				 * missing.  we do this first to make sure it
				 * is cleaned up since there may be legacy
				 * code add/del via dfstab and we need to
				 * cleanup SMF.
				 */
				defgroup = sa_get_group(handle, "default");
				if (defgroup != NULL)
					legacy_removes(defgroup, path);
				/* Parse the dfstab and add anything new */
				parse_dfstab(handle, path, *root);
			}
		}
	}
}

/*
 * get_share_list(&err)
 *
 * Get a linked list of all the shares on the system from
 * /etc/dfs/sharetab. This is partially copied from libfsmgt which we
 * can't use due to package dependencies.
 */
static xfs_sharelist_t *
get_share_list(int *errp)
{
	xfs_sharelist_t	*newp;
	xfs_sharelist_t	*headp;
	xfs_sharelist_t	*tailp;
	FILE		*fp;

	headp = NULL;
	tailp = NULL;

	if ((fp = fopen(SHARETAB, "r")) != NULL) {
		struct share	*sharetab_entry;

		(void) lockf(fileno(fp), F_LOCK, 0);
		(void) mutex_lock(&sharetab_lock);

		while (getshare(fp, &sharetab_entry) > 0) {
			newp = alloc_sharelist();
			if (newp == NULL) {
				(void) mutex_unlock(&sharetab_lock);
				(void) lockf(fileno(fp), F_ULOCK, 0);
				goto err;
			}

			/*
			 * Link into the list here so we don't leak
			 * memory on a failure from strdup().
			 */
			if (headp == NULL) {
				headp = newp;
				tailp = newp;
			} else {
				tailp->next = newp;
				tailp = newp;
			}

			newp->path = strdup(sharetab_entry->sh_path);
			newp->resource = strdup(sharetab_entry->sh_res);
			newp->fstype = strdup(sharetab_entry->sh_fstype);
			newp->options = strdup(sharetab_entry->sh_opts);
			newp->description = strdup(sharetab_entry->sh_descr);

			if (newp->path == NULL || newp->resource == NULL ||
			    newp->fstype == NULL || newp->options == NULL ||
			    newp->description == NULL) {
				(void) mutex_unlock(&sharetab_lock);
				(void) lockf(fileno(fp), F_ULOCK, 0);
				goto err;
			}
		}

		(void) mutex_unlock(&sharetab_lock);
		(void) lockf(fileno(fp), F_ULOCK, 0);
		(void) fclose(fp);
	} else {
		*errp = errno;
	}

	/*
	 * Caller must free the mount list
	 */
	return (headp);
err:
	/*
	 * Out of memory so cleanup and leave.
	 */
	dfs_free_list(headp);
	(void) fclose(fp);
	return (NULL);
}

/*
 * parse_sharetab(handle)
 *
 * Read the /etc/dfs/sharetab file and see which entries don't exist
 * in the repository. These shares are marked transient.  We also need
 * to see if they are ZFS shares since ZFS bypasses the SMF
 * repository.
 */

int
parse_sharetab(sa_handle_t handle)
{
	xfs_sharelist_t *list, *tmplist;
	int err = 0;
	sa_share_t share;
	sa_group_t group;
	sa_group_t lgroup;
	char *groupname;
	int legacy = 0;
	char shareopts[MAXNAMLEN];

	list = get_share_list(&err);
	if (list == NULL)
		return (legacy);

	lgroup = sa_get_group(handle, "default");

	for (tmplist = list; tmplist != NULL; tmplist = tmplist->next) {
		group = NULL;
		share = sa_find_share(handle, tmplist->path);
		if (share != NULL) {
			/*
			 * If this is a legacy share, mark as shared so we
			 * only update sharetab appropriately. We also keep
			 * the sharetab options in order to display for legacy
			 * share with no arguments.
			 */
			set_node_attr(share, "shared", "true");
			(void) snprintf(shareopts, MAXNAMLEN, "shareopts-%s",
			    tmplist->fstype);
			set_node_attr(share, shareopts, tmplist->options);
			continue;
		}

		/*
		 * This share is transient so needs to be
		 * added. Initially, this will be under
		 * default(legacy) unless it is a ZFS
		 * share. If zfs, we need a zfs group.
		 */
		if (tmplist->resource != NULL &&
		    (groupname = strchr(tmplist->resource, '@')) != NULL) {
			/* There is a defined group */
			*groupname++ = '\0';
			group = sa_get_group(handle, groupname);
			if (group != NULL) {
				share = _sa_add_share(group, tmplist->path,
				    SA_SHARE_TRANSIENT, &err,
				    (uint64_t)SA_FEATURE_NONE);
			} else {
				/*
				 * While this case shouldn't
				 * occur very often, it does
				 * occur out of a "zfs set
				 * sharenfs=off" when the
				 * dataset is also set to
				 * canmount=off. A warning
				 * will then cause the zfs
				 * command to abort. Since we
				 * add it to the default list,
				 * everything works properly
				 * anyway and the library
				 * doesn't need to give a
				 * warning.
				 */
				share = _sa_add_share(lgroup,
				    tmplist->path, SA_SHARE_TRANSIENT,
				    &err, (uint64_t)SA_FEATURE_NONE);
			}
		} else {
			if (sa_zfs_is_shared(handle, tmplist->path)) {
				group = sa_get_group(handle, "zfs");
				if (group == NULL) {
					group = sa_create_group(handle,
					    "zfs", &err);
					if (group == NULL &&
					    err == SA_NO_PERMISSION) {
						group = _sa_create_group(
						    (sa_handle_impl_t)
						    handle,
						    "zfs");
					}
					if (group != NULL) {
						(void) sa_create_optionset(
						    group, tmplist->fstype);
						(void) sa_set_group_attr(group,
						    "zfs", "true");
					}
				}
				if (group != NULL) {
					share = _sa_add_share(group,
					    tmplist->path, SA_SHARE_TRANSIENT,
					    &err, (uint64_t)SA_FEATURE_NONE);
				}
			} else {
				share = _sa_add_share(lgroup, tmplist->path,
				    SA_SHARE_TRANSIENT, &err,
				    (uint64_t)SA_FEATURE_NONE);
			}
		}
		if (share == NULL)
			(void) printf(dgettext(TEXT_DOMAIN,
			    "Problem with transient: %s\n"), sa_errorstr(err));
		if (share != NULL)
			set_node_attr(share, "shared", "true");
		if (err == SA_OK) {
			if (tmplist->options != NULL &&
			    strlen(tmplist->options) > 0) {
				(void) sa_parse_legacy_options(share,
				    tmplist->options, tmplist->fstype);
			}
			if (tmplist->resource != NULL &&
			    strcmp(tmplist->resource, "-") != 0)
				set_node_attr(share, "resource",
				    tmplist->resource);
			if (tmplist->description != NULL) {
				xmlNodePtr node;
				node = xmlNewChild((xmlNodePtr)share, NULL,
				    (xmlChar *)"description", NULL);
				xmlNodeSetContent(node,
				    (xmlChar *)tmplist->description);
			}
			legacy = 1;
		}
	}
	dfs_free_list(list);
	return (legacy);
}

/*
 * Get the transient shares from the sharetab (or other) file.  since
 * these are transient, they only appear in the working file and not
 * in a repository.
 */
int
gettransients(sa_handle_impl_t ihandle, xmlNodePtr *root)
{
	int legacy = 0;
	int numproto;
	char **protocols = NULL;
	int i;

	if (root != NULL) {
		if (*root == NULL)
			*root = xmlNewNode(NULL, (xmlChar *)"sharecfg");
		if (*root != NULL) {
			legacy = parse_sharetab(ihandle);
			numproto = sa_get_protocols(&protocols);
			for (i = 0; i < numproto; i++)
				legacy |= sa_proto_get_transients(
				    (sa_handle_t)ihandle, protocols[i]);
			if (protocols != NULL)
				free(protocols);
		}
	}
	return (legacy);
}

/*
 * sa_has_prop(optionset, prop)
 *
 * Is the specified property a member of the optionset?
 */

int
sa_has_prop(sa_optionset_t optionset, sa_property_t prop)
{
	char *name;
	sa_property_t otherprop;
	int result = 0;

	if (optionset != NULL) {
		name = sa_get_property_attr(prop, "type");
		if (name != NULL) {
			otherprop = sa_get_property(optionset, name);
			if (otherprop != NULL)
				result = 1;
			sa_free_attr_string(name);
		}
	}
	return (result);
}

/*
 * Update legacy files
 *
 * Provides functions to add/remove/modify individual entries
 * in dfstab and sharetab
 */

void
update_legacy_config(sa_handle_t handle)
{
	/*
	 * no longer used -- this is a placeholder in case we need to
	 * add it back later.
	 */
#ifdef lint
	handle = handle;
#endif
}

/*
 * sa_valid_property(handle, object, proto, property)
 *
 * check to see if the specified property is valid relative to the
 * specified protocol. The protocol plugin is called to do the work.
 */

int
sa_valid_property(sa_handle_t handle, void *object, char *proto,
    sa_property_t property)
{
	int ret = SA_OK;

	if (proto != NULL && property != NULL) {
		ret = sa_proto_valid_prop(handle, proto, property, object);
	}

	return (ret);
}

/*
 * sa_fstype(path)
 *
 * Given path, return the string representing the path's file system
 * type. This is used to discover ZFS shares.
 */

char *
sa_fstype(char *path)
{
	int err;
	struct stat st;

	err = stat(path, &st);
	if (err < 0)
		err = SA_NO_SUCH_PATH;
	else
		err = SA_OK;

	/*
	 * If we have a valid path at this point ret, return the fstype.
	 */
	if (err == SA_OK)
		return (strdup(st.st_fstype));

	return (NULL);
}

void
sa_free_fstype(char *type)
{
	free(type);
}

/*
 * sa_get_derived_optionset(object, proto, hier)
 *
 *	Work backward to the top of the share object tree and start
 *	copying protocol specific optionsets into a newly created
 *	optionset that doesn't have a parent (it will be freed
 *	later). This provides for the property inheritance model. That
 *	is, properties closer to the share take precedence over group
 *	level. This also provides for groups of groups in the future.
 */

sa_optionset_t
sa_get_derived_optionset(void *object, char *proto, int hier)
{
	sa_optionset_t newoptionset;
	sa_optionset_t optionset;
	sa_group_t group;

	if (hier &&
	    (group = sa_get_parent_group((sa_share_t)object)) != NULL) {
		newoptionset = sa_get_derived_optionset((void *)group, proto,
		    hier);
	} else {
		newoptionset = (sa_optionset_t)xmlNewNode(NULL,
		    (xmlChar *)"optionset");
		if (newoptionset != NULL) {
			sa_set_optionset_attr(newoptionset, "type", proto);
		}
	}
	/* Dont' do anything if memory wasn't allocated */
	if (newoptionset == NULL)
		return (NULL);

	/* Found the top so working back down the stack */
	optionset = sa_get_optionset((sa_optionset_t)object, proto);
	if (optionset != NULL) {
		sa_property_t prop;
		/* add optionset to the newoptionset */
		for (prop = sa_get_property(optionset, NULL);
		    prop != NULL;
		    prop = sa_get_next_property(prop)) {
			sa_property_t newprop;
			char *name;
			char *value;
			name = sa_get_property_attr(prop, "type");
			value = sa_get_property_attr(prop, "value");
			if (name == NULL)
				continue;
			newprop = sa_get_property(newoptionset, name);
			/* Replace the value with the new value */
			if (newprop != NULL) {
				/*
				 * Only set if value is non NULL, old value ok
				 * if it is NULL.
				 */
				if (value != NULL)
					set_node_attr(newprop, "value", value);
			} else {
				/* an entirely new property */
				if (value != NULL) {
					newprop = sa_create_property(name,
					    value);
					if (newprop != NULL) {
						newprop = (sa_property_t)
						    xmlAddChild(
						    (xmlNodePtr)newoptionset,
						    (xmlNodePtr)newprop);
					}
				}
			}
			sa_free_attr_string(name);

			if (value != NULL)
				sa_free_attr_string(value);
		}
	}
	return (newoptionset);
}

void
sa_free_derived_optionset(sa_optionset_t optionset)
{
	/* While it shouldn't be linked, it doesn't hurt */
	if (optionset != NULL) {
		xmlUnlinkNode((xmlNodePtr) optionset);
		xmlFreeNode((xmlNodePtr) optionset);
	}
}

/*
 *  sa_get_all_security_types(object, proto, hier)
 *
 *	Find all the security types set for this object.  This is
 *	preliminary to getting a derived security set. The return value is an
 *	optionset containg properties which are the sectype values found by
 *	walking up the XML document structure. The returned optionset
 *	is a derived optionset.
 *
 *	If hier is 0, only look at object. If non-zero, walk up the tree.
 */
sa_optionset_t
sa_get_all_security_types(void *object, char *proto, int hier)
{
	sa_optionset_t options;
	sa_security_t security;
	sa_group_t group;
	sa_property_t prop;

	options = NULL;

	if (hier &&
	    (group = sa_get_parent_group((sa_share_t)object)) != NULL)
		options = sa_get_all_security_types((void *)group, proto, hier);
	else
		options = (sa_optionset_t)xmlNewNode(NULL,
		    (xmlChar *)"optionset");

	if (options == NULL)
		return (options);

	/* Hit the top so collect the security types working back. */
	for (security = sa_get_security((sa_group_t)object, NULL, NULL);
	    security != NULL;
	    security = sa_get_next_security(security)) {
		char *type;
		char *sectype;

		type = sa_get_security_attr(security, "type");
		if (type != NULL) {
			if (strcmp(type, proto) != 0) {
				sa_free_attr_string(type);
				continue;
			}
			sectype = sa_get_security_attr(security, "sectype");
			if (sectype != NULL) {
				/*
				 * Have a security type, check to see if
				 * already present in optionset and add if it
				 * isn't.
				 */
				if (sa_get_property(options, sectype) == NULL) {
					prop = sa_create_property(sectype,
					    "true");
					if (prop != NULL)
						prop = (sa_property_t)
						    xmlAddChild(
						    (xmlNodePtr)options,
						    (xmlNodePtr)prop);
				}
				sa_free_attr_string(sectype);
			}
			sa_free_attr_string(type);
		}
	}

	return (options);
}

/*
 * sa_get_derived_security(object, sectype, proto, hier)
 *
 * Get the derived security(named optionset) for the object given the
 * sectype and proto. If hier is non-zero, walk up the tree to get all
 * properties defined for this object, otherwise just those on the
 * object.
 */

sa_security_t
sa_get_derived_security(void *object, char *sectype, char *proto, int hier)
{
	sa_security_t newsecurity;
	sa_security_t security;
	sa_group_t group;
	sa_property_t prop;

	if (hier &&
	    (group = sa_get_parent_group((sa_share_t)object)) != NULL) {
		newsecurity = sa_get_derived_security((void *)group,
		    sectype, proto, hier);
	} else {
		newsecurity = (sa_security_t)xmlNewNode(NULL,
		    (xmlChar *)"security");
		if (newsecurity != NULL) {
			sa_set_security_attr(newsecurity, "type", proto);
			sa_set_security_attr(newsecurity, "sectype", sectype);
		}
	}
	/* Don't do anything if memory wasn't allocated */
	if (newsecurity == NULL)
		return (newsecurity);

	/* Found the top so working back down the stack. */
	security = sa_get_security((sa_security_t)object, sectype, proto);
	if (security == NULL)
		return (newsecurity);

	/* add security to the newsecurity */
	for (prop = sa_get_property(security, NULL);
	    prop != NULL; prop = sa_get_next_property(prop)) {
		sa_property_t newprop;
		char *name;
		char *value;
		name = sa_get_property_attr(prop, "type");
		value = sa_get_property_attr(prop, "value");
		if (name != NULL) {
			newprop = sa_get_property(newsecurity, name);
			/* Replace the value with the new value */
			if (newprop != NULL) {
				/*
				 * Only set if value is non NULL, old
				 * value ok if it is NULL. The value
				 * must be associated with the "value"
				 * tag within XML.
				 */
				if (value != NULL)
					set_node_attr(newprop, "value", value);
			} else {
				/* An entirely new property */
				if (value != NULL) {
					newprop = sa_create_property(name,
					    value);
					newprop = (sa_property_t)
					    xmlAddChild((xmlNodePtr)newsecurity,
					    (xmlNodePtr)newprop);
				}
			}
			sa_free_attr_string(name);
		}
		if (value != NULL)
			sa_free_attr_string(value);
	}
	return (newsecurity);
}

void
sa_free_derived_security(sa_security_t security)
{
	/* while it shouldn't be linked, it doesn't hurt */
	if (security != NULL) {
		xmlUnlinkNode((xmlNodePtr)security);
		xmlFreeNode((xmlNodePtr)security);
	}
}

/*
 * sharetab utility functions
 *
 * Makes use of the original sharetab.c from fs.d/nfs/lib
 */

/*
 * sa_fillshare(share, proto, sh)
 *
 * Fill the struct share with values obtained from the share object.
 */
void
sa_fillshare(sa_share_t share, char *proto, struct share *sh)
{
	char *groupname = NULL;
	char *value;
	sa_group_t group;
	char *buff;
	char *zfs;
	sa_resource_t resource;
	char *rsrcname = NULL;
	char *defprop;

	/*
	 * We only want to deal with the path level shares for the
	 * sharetab file. If a resource, get the parent.
	 */
	if (sa_is_resource(share)) {
		resource = (sa_resource_t)share;
		share = sa_get_resource_parent(resource);
		rsrcname = sa_get_resource_attr(resource, "name");
	}

	group = sa_get_parent_group(share);
	if (group != NULL) {
		zfs = sa_get_group_attr(group, "zfs");
		groupname = sa_get_group_attr(group, "name");

		if (groupname != NULL &&
		    (strcmp(groupname, "default") == 0 || zfs != NULL)) {
			/*
			 * since the groupname is either "default" or the
			 * group is a ZFS group, we don't want to keep
			 * groupname. We do want it if it is any other type of
			 * group.
			 */
			sa_free_attr_string(groupname);
			groupname = NULL;
		}
		if (zfs != NULL)
			sa_free_attr_string(zfs);
	}

	value = sa_get_share_attr(share, "path");
	if (value != NULL) {
		sh->sh_path = strdup(value);
		sa_free_attr_string(value);
	}

	if (rsrcname != NULL || groupname != NULL) {
		int len = 0;

		if (rsrcname != NULL)
			len += strlen(rsrcname);
		if (groupname != NULL)
			len += strlen(groupname);
		len += 3; /* worst case */
		buff = malloc(len);
		(void) snprintf(buff, len, "%s%s%s",
		    (rsrcname != NULL &&
		    strlen(rsrcname) > 0) ? rsrcname : "-",
		    groupname != NULL ? "@" : "",
		    groupname != NULL ? groupname : "");
		sh->sh_res = buff;
		if (rsrcname != NULL)
			sa_free_attr_string(rsrcname);
		if (groupname != NULL)
			sa_free_attr_string(groupname);
	} else {
		sh->sh_res = strdup("-");
	}

	/*
	 * Get correct default prop string. NFS uses "rw", others use
	 * "".
	 */
	if (strcmp(proto, "nfs") != 0)
		defprop = "\"\"";
	else
		defprop = "rw";

	sh->sh_fstype = strdup(proto);
	value = sa_proto_legacy_format(proto, share, 1);
	if (value != NULL) {
		if (strlen(value) > 0)
			sh->sh_opts = strdup(value);
		else
			sh->sh_opts = strdup(defprop);
		free(value);
	} else {
		sh->sh_opts = strdup(defprop);
	}

	value = sa_get_share_description(share);
	if (value != NULL) {
		sh->sh_descr = strdup(value);
		sa_free_share_description(value);
	} else {
		sh->sh_descr = strdup("");
	}
}

/*
 * sa_emptyshare(sh)
 *
 * Free the strings in the non-NULL members of sh.
 */

void
sa_emptyshare(struct share *sh)
{
	if (sh->sh_path != NULL)
		free(sh->sh_path);
	sh->sh_path = NULL;
	if (sh->sh_res != NULL)
		free(sh->sh_res);
	sh->sh_res = NULL;
	if (sh->sh_fstype != NULL)
		free(sh->sh_fstype);
	sh->sh_fstype = NULL;
	if (sh->sh_opts != NULL)
		free(sh->sh_opts);
	sh->sh_opts = NULL;
	if (sh->sh_descr != NULL)
		free(sh->sh_descr);
	sh->sh_descr = NULL;
}

/*
 * sa_update_sharetab_ts(handle)
 *
 * Update the internal timestamp of when sharetab was last
 * changed. This needs to be public for ZFS to get at it.
 */

void
sa_update_sharetab_ts(sa_handle_t handle)
{
	struct stat st;
	sa_handle_impl_t implhandle = (sa_handle_impl_t)handle;

	if (implhandle != NULL && stat(SA_LEGACY_SHARETAB, &st) == 0)
		implhandle->tssharetab = TSTAMP(st.st_mtim);
}

/*
 * sa_update_sharetab(share, proto)
 *
 * Update the sharetab file with info from the specified share.
 * This could be an update or add.
 */

int
sa_update_sharetab(sa_share_t share, char *proto)
{
	int	ret = SA_OK;
	share_t	sh;
	char	*path;
	sa_handle_t handle;

	path = sa_get_share_attr(share, "path");
	if (path != NULL) {
		(void) memset(&sh, '\0', sizeof (sh));

		handle = sa_find_group_handle((sa_group_t)share);
		if (handle != NULL) {
			/*
			 * Fill in share structure and send it to the kernel.
			 */
			(void) sa_fillshare(share, proto, &sh);
			(void) _sharefs(SHAREFS_ADD, &sh);
			/*
			 * We need the timestamp of the sharetab file right
			 * after the update was done. This lets us detect a
			 * change that made by a different process.
			 */
			sa_update_sharetab_ts(handle);
			sa_emptyshare(&sh);
		} else {
			ret = SA_CONFIG_ERR;
		}
		sa_free_attr_string(path);
	}

	return (ret);
}

/*
 * sa_delete_sharetab(handle, path, proto)
 *
 * remove the specified share from sharetab.
 */

int
sa_delete_sharetab(sa_handle_t handle, char *path, char *proto)
{
	int	ret = SA_OK;
	struct stat st;

	share_t	sh;
	/*
	 * Both the path and the proto are
	 * keys into the sharetab.
	 */
	if (path != NULL && proto != NULL) {
		(void) memset(&sh, '\0', sizeof (sh));
		sh.sh_path = path;
		sh.sh_fstype = proto;

		ret = _sharefs(SHAREFS_REMOVE, &sh);
		if (handle != NULL && stat(SA_LEGACY_SHARETAB, &st) == 0)
			sa_update_sharetab_ts(handle);
	}
	return (ret);
}

/*
 * sa_needs_refresh(handle)
 *
 * Returns B_TRUE if the internal cache needs to be refreshed do to a
 * change by another process.  B_FALSE returned otherwise.
 */
boolean_t
sa_needs_refresh(sa_handle_t handle)
{
	sa_handle_impl_t implhandle = (sa_handle_impl_t)handle;
	struct stat st;
	char *str;
	uint64_t tstamp;
	scf_simple_prop_t *prop;

	if (handle == NULL)
		return (B_TRUE);

	/*
	 * If sharetab has changed, then there was an external
	 * change. Check sharetab first since it is updated by ZFS as
	 * well as sharemgr.  This is where external ZFS changes are
	 * caught.
	 */
	if (stat(SA_LEGACY_SHARETAB, &st) == 0 &&
	    TSTAMP(st.st_mtim) != implhandle->tssharetab)
		return (B_TRUE);

	/*
	 * If sharetab wasn't changed, check whether there were any
	 * SMF transactions that modified the config but didn't
	 * initiate a share.  This is less common but does happen.
	 */
	prop = scf_simple_prop_get(implhandle->scfhandle->handle,
	    (const char *)SA_SVC_FMRI_BASE ":default", "state",
	    "lastupdate");
	if (prop != NULL) {
		str = scf_simple_prop_next_astring(prop);
		if (str != NULL)
			tstamp = strtoull(str, NULL, 0);
		else
			tstamp = 0;
		scf_simple_prop_free(prop);
		if (tstamp != implhandle->tstrans)
			return (B_TRUE);
	}

	return (B_FALSE);
}

/*
 * sa_fix_resource_name(path)
 *
 * Convert invalid characters in a resource name (SMB share name)
 * to underscores ('_').  The list of invalid characters includes
 * control characters and the following:
 *
 *	" / \ [ ] : | < > + ; , ? * =
 *
 * The caller must pass a valid path.  Leading and trailing slashes
 * are stripped from the path before converting invalid characters.
 * Resource names are restricted to SA_MAX_RESOURCE_NAME characters.
 */
void
sa_fix_resource_name(char *path)
{
	char *invalid = "\"/\\[]:|<>+;,?*=";
	char *p = path;
	char *q;
	size_t len;

	assert(path != NULL);

	/*
	 * Strip leading and trailing /'s.
	 */
	p += strspn(p, "/");
	q = strchr(p, '\0');
	if (q != NULL && q != path) {
		while ((--q, *q == '/'))
			*q = '\0';
	}

	if (*p == '\0') {
		(void) strcpy(path, "_");
		return;
	}

	/*
	 * Stride over path components until the remaining
	 * path is no longer than SA_MAX_RESOURCE_NAME.
	 */
	q = p;
	while ((q != NULL) && (strlen(q) > SA_MAX_RESOURCE_NAME)) {
		if ((q = strchr(q, '/')) != NULL) {
			++q;
			p = q;
		}
	}

	/*
	 * If the path is still longer than SA_MAX_RESOURCE_NAME,
	 * take the trailing SA_MAX_RESOURCE_NAME characters.
	 */
	if ((len = strlen(p)) > SA_MAX_RESOURCE_NAME) {
		len = SA_MAX_RESOURCE_NAME;
		p = strchr(p, '\0') - (SA_MAX_RESOURCE_NAME - 1);
	}

	(void) memmove(path, p, len);
	path[len] = '\0';

	for (p = path; *p != '\0'; ++p) {
		if ((iscntrl(*p)) || strchr(invalid, *p))
			*p = '_';
	}
}