/*

* setcifsacl utility

*

* Copyright (C) Shirish Pargaonkar (shirishp@us.ibm.com) 2011

*

* Used to alter entries of an ACL or replace an entire ACL in a

* security descriptor of a file system object that belongs to a

* share mounted using option cifsacl.

*

* This program is free software; you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation; either version 2 of the License, or

* (at your option) any later version.

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

* You should have received a copy of the GNU General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

*/

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif /* HAVE_CONFIG_H */

#include <string.h>

#include <getopt.h>

#include <stdint.h>

#include <stdbool.h>

#include <unistd.h>

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <limits.h>

#include <ctype.h>

#include <sys/xattr.h>

#include "cifsacl.h"

#include "idmap_plugin.h"

enum setcifsacl_actions {

	ActUnknown = -1,

	ActDelete,

	ActModify,

	ActAdd,

	ActSet

};

static void *plugin_handle;

static bool plugin_loaded;

static int

copy_cifs_sid(struct cifs_sid *dst, const struct cifs_sid *src)

{

	int i, size = 0;

	dst->revision = src->revision;

	size += sizeof(uint8_t);

	dst->num_subauth = src->num_subauth;

	size += sizeof(uint8_t);

	for (i = 0; i < NUM_AUTHS; i++)

		dst->authority[i] = src->authority[i];

	size += (sizeof(uint8_t) * NUM_AUTHS);

	for (i = 0; i < src->num_subauth; i++)

		dst->sub_auth[i] = src->sub_auth[i];

	size += (sizeof(uint32_t) * src->num_subauth);

	return size;

}

static ssize_t

copy_sec_desc(const struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd,

		int numaces, int acessize)

{

	int size, osidsoffset, gsidsoffset, dacloffset;

	ssize_t bufsize;

	struct cifs_sid *owner_sid_ptr, *group_sid_ptr;

	struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr;

	struct cifs_ctrl_acl *dacl_ptr, *ndacl_ptr;

	/* copy security descriptor control portion */

	osidsoffset = le32toh(pntsd->osidoffset);

	gsidsoffset = le32toh(pntsd->gsidoffset);

	dacloffset = le32toh(pntsd->dacloffset);

	size = sizeof(struct cifs_ntsd);

	pnntsd->revision = pntsd->revision;

	pnntsd->type = pntsd->type;

	pnntsd->osidoffset = pntsd->osidoffset;

	pnntsd->gsidoffset = pntsd->gsidoffset;

	pnntsd->dacloffset = pntsd->dacloffset;

	bufsize = size;

	dacl_ptr = (struct cifs_ctrl_acl *)((char *)pntsd + dacloffset);

	ndacl_ptr = (struct cifs_ctrl_acl *)((char *)pnntsd + dacloffset);

	size = acessize + sizeof(struct cifs_ctrl_acl);

	ndacl_ptr->revision = dacl_ptr->revision;

	ndacl_ptr->size = htole16(size);

	ndacl_ptr->num_aces = htole32(numaces);

	bufsize += size;

	/* copy owner sid */

	owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + osidsoffset);

	group_sid_ptr = (struct cifs_sid *)((char *)pntsd + gsidsoffset);

	/*

	 * some servers like Azure return the owner and group SIDs at end rather

	 * than at the beginning of the ACL so don't want to overwrite the last ACEs

         */

	if (dacloffset <= osidsoffset) {

		/* owners placed at end of ACL */

		nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + dacloffset + size);

		pnntsd->osidoffset = dacloffset + size;

		size = copy_cifs_sid(nowner_sid_ptr, owner_sid_ptr);

		bufsize += size;

		/* put group SID after owner SID */

		ngroup_sid_ptr = (struct cifs_sid *)((char *)nowner_sid_ptr + size);

		pnntsd->gsidoffset = pnntsd->osidoffset + size;

	} else {

		/*

		 * Most servers put the owner information at the beginning,

		 * before the ACL

		 */

		nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + osidsoffset);

		size = copy_cifs_sid(nowner_sid_ptr, owner_sid_ptr);

		bufsize += size;

		ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + gsidsoffset);

	}

	/* copy group sid */

	size = copy_cifs_sid(ngroup_sid_ptr, group_sid_ptr);

	bufsize += size;

	return bufsize;

}

static int

copy_ace(struct cifs_ace *dace, struct cifs_ace *sace)

{

	dace->type = sace->type;

	dace->flags = sace->flags;

	dace->access_req = sace->access_req;

	copy_cifs_sid(&dace->sid, &sace->sid);

	dace->size = sace->size;

	return le16toh(dace->size);

}

static int

compare_aces(struct cifs_ace *sace, struct cifs_ace *dace, int compflags)

{

	int i;

	if (compflags & COMPSID) {

		if (dace->sid.revision != sace->sid.revision)

			return 0;

		if (dace->sid.num_subauth != sace->sid.num_subauth)

			return 0;

		for (i = 0; i < NUM_AUTHS; i++) {

			if (dace->sid.authority[i] != sace->sid.authority[i])

				return 0;

		}

		for (i = 0; i < sace->sid.num_subauth; i++) {

			if (dace->sid.sub_auth[i] != sace->sid.sub_auth[i])

				return 0;

		}

	}

	if (compflags & COMPTYPE) {

		if (dace->type != sace->type)

			return 0;

	}

	if (compflags & COMPFLAG) {

		if (dace->flags != sace->flags)

			return 0;

	}

	if (compflags & COMPMASK) {

		if (dace->access_req != sace->access_req)

			return 0;

	}

	return 1;

}

static int

alloc_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd **npntsd,

			int aces, size_t *acesoffset)

{

	unsigned int size, acessize, bufsize, dacloffset;

	size = sizeof(struct cifs_ntsd) +

		2 * sizeof(struct cifs_sid) +

		sizeof(struct cifs_ctrl_acl);

	dacloffset = le32toh(pntsd->dacloffset);

	*acesoffset = dacloffset + sizeof(struct cifs_ctrl_acl);

	acessize = aces * sizeof(struct cifs_ace);

	bufsize = size + acessize;

	*npntsd = malloc(bufsize);

	if (!*npntsd) {

		printf("%s: Memory allocation failure", __func__);

		return errno;

	}

	return 0;

}

static int

ace_set(struct cifs_ntsd *pntsd, struct cifs_ntsd **npntsd, ssize_t *bufsize,

			struct cifs_ace **cacesptr, int numcaces)

{

	int i, rc, size = 0, acessize = 0;

	size_t acesoffset;

	char *acesptr;

	rc = alloc_sec_desc(pntsd, npntsd, numcaces, &acesoffset);

	if (rc)

		return rc;

	acesptr = (char *)*npntsd + acesoffset;

	for (i = 0; i < numcaces; ++i) {

		size = copy_ace((struct cifs_ace *)acesptr, cacesptr[i]);

		acessize += size;

		acesptr += size;

	}

	*bufsize = copy_sec_desc(pntsd, *npntsd, numcaces, acessize);

	return 0;

}

static int

ace_add(struct cifs_ntsd *pntsd, struct cifs_ntsd **npntsd, ssize_t *bufsize,

		struct cifs_ace **facesptr, int numfaces,

		struct cifs_ace **cacesptr, int numcaces)

{

	int i, rc, numaces, size, acessize = 0;

	size_t acesoffset;

	char *acesptr;

	numaces = numfaces + numcaces;

	rc = alloc_sec_desc(pntsd, npntsd, numaces, &acesoffset);

	if (rc)

		return rc;

	acesptr = (char *)*npntsd + acesoffset;

	for (i = 0; i < numfaces; ++i) {

		size = copy_ace((struct cifs_ace *)acesptr, facesptr[i]);

		acesptr += size;

		acessize += size;

	}

	for (i = 0; i < numcaces; ++i) {

		size = copy_ace((struct cifs_ace *)acesptr, cacesptr[i]);

		acesptr += size;

		acessize += size;

	}

	*bufsize = copy_sec_desc(pntsd, *npntsd, numaces, acessize);

	return 0;

}

static int

ace_modify(struct cifs_ntsd *pntsd, struct cifs_ntsd **npntsd, ssize_t *bufsize,

		struct cifs_ace **facesptr, int numfaces,

		struct cifs_ace **cacesptr, int numcaces)

{

	int i, j, rc, size, acessize = 0;

	size_t acesoffset;

	char *acesptr;

	if (numfaces == 0) {

		printf("%s: No entries to modify", __func__);

		return -1;

	}

	rc = alloc_sec_desc(pntsd, npntsd, numfaces, &acesoffset);

	if (rc)

		return rc;

	for (j = 0; j < numcaces; ++j) {

		for (i = 0; i < numfaces; ++i) {

			if (compare_aces(facesptr[i], cacesptr[j],

					COMPSID | COMPTYPE)) {

				copy_ace(facesptr[i], cacesptr[j]);

				break;

			}

		}

	}

	acesptr = (char *)*npntsd + acesoffset;

	for (i = 0; i < numfaces; ++i) {

		size = copy_ace((struct cifs_ace *)acesptr, facesptr[i]);

		acesptr += size;

		acessize += size;

	}

	*bufsize = copy_sec_desc(pntsd, *npntsd, numfaces, acessize);

	return 0;

}

static int

ace_delete(struct cifs_ntsd *pntsd, struct cifs_ntsd **npntsd, ssize_t *bufsize,

		struct cifs_ace **facesptr, int numfaces,

		struct cifs_ace **cacesptr, int numcaces)

{

	int i, j, numaces = 0, rc, size, acessize = 0;

	size_t acesoffset;

	char *acesptr;

	if (numfaces == 0) {

		printf("%s: No entries to delete\n", __func__);

		return -1;

	}

	if (numfaces < numcaces) {

		printf("%s: Invalid entries to delete\n", __func__);

		return -1;

	}

	rc = alloc_sec_desc(pntsd, npntsd, numfaces, &acesoffset);

	if (rc)

		return rc;

	acesptr = (char *)*npntsd + acesoffset;

	for (i = 0; i < numfaces; ++i) {

		for (j = 0; j < numcaces; ++j) {

			if (compare_aces(facesptr[i], cacesptr[j], COMPALL))

				break;

		}

		if (j == numcaces) {

			size = copy_ace((struct cifs_ace *)acesptr,

								facesptr[i]);

			acessize += size;

			acesptr += size;

			++numaces;

		}

	}

	if (numaces == numfaces) {

		printf("%s: Nothing to delete\n", __func__);

		return 1;

	}

	*bufsize = copy_sec_desc(pntsd, *npntsd, numaces, acessize);

	return 0;

}

static int

get_numfaces(struct cifs_ntsd *pntsd, ssize_t acl_len,

			struct cifs_ctrl_acl **daclptr)

{

	int numfaces = 0;

	uint32_t dacloffset;

	struct cifs_ctrl_acl *ldaclptr;

	char *end_of_acl = ((char *)pntsd) + acl_len;

	dacloffset = le32toh(pntsd->dacloffset);

	if (!dacloffset)

		return 0;

	ldaclptr = (struct cifs_ctrl_acl *)((char *)pntsd + dacloffset);

	/* validate that we do not go past end of acl */

	if (end_of_acl >= (char *)ldaclptr + le16toh(ldaclptr->size)) {

		numfaces = le32toh(ldaclptr->num_aces);

		*daclptr = ldaclptr;

	}

	return numfaces;

}

static struct cifs_ace **

build_fetched_aces(char *daclptr, int numfaces)

{

	int i, acl_size;

	char *acl_base;

	struct cifs_ace *pace, **facesptr;

	facesptr = calloc(numfaces, sizeof(struct cifs_aces *));

	if (!facesptr) {

		printf("%s: Error %d allocating ACE array",

				__func__, errno);

		return facesptr;

	}

	acl_base = daclptr;

	acl_size = sizeof(struct cifs_ctrl_acl);

	for (i = 0; i < numfaces; ++i) {

		facesptr[i] = malloc(sizeof(struct cifs_ace));

		if (!facesptr[i])

			goto build_fetched_aces_err;

		pace = (struct cifs_ace *) (acl_base + acl_size);

		memcpy(facesptr[i], pace, sizeof(struct cifs_ace));

		acl_base = (char *)pace;

		acl_size = le16toh(pace->size);

	}

	return facesptr;

build_fetched_aces_err:

	printf("%s: Invalid fetched ace\n", __func__);

	for (i = 0; i < numfaces; ++i)

		free(facesptr[i]);

	free(facesptr);

	return NULL;

}

static int

verify_ace_type(char *typestr, uint8_t *typeval)

{

	int i, len;

	char *invaltype;

	if (strstr(typestr, "0x")) { /* hex type value */

		*typeval = strtol(typestr, &invaltype, 16);

		if (!strlen(invaltype)) {

			if (*typeval != ACCESS_ALLOWED &&

				*typeval != ACCESS_DENIED &&

				*typeval != ACCESS_ALLOWED_OBJECT &&

				*typeval != ACCESS_DENIED_OBJECT) {

					printf("%s: Invalid type: %s\n",

						__func__, typestr);

					return 1;

			}

			return 0;

		}

	}

	len = strlen(typestr);

	for (i = 0; i < len; ++i)

		*(typestr + i) = toupper(*(typestr + i));

	if (!strcmp(typestr, "ALLOWED"))

		*typeval = 0x0;

	else if (!strcmp(typestr, "DENIED"))

		*typeval = 0x1;

	else if (!strcmp(typestr, "ALLOWED_OBJECT"))

		*typeval = 0x5;

	else if (!strcmp(typestr, "DENIED_OBJECT"))

		*typeval = 0x6;

	else {

		printf("%s: Invalid type: %s\n", __func__, typestr);

		return 1;

	}

	return 0;

}

static uint8_t

ace_flag_value(char *flagstr)

{

	uint8_t flagval = 0x0;

	char *iflag;

	iflag = strtok(flagstr, "|"); /* everything before | */

	while (iflag) {

		if (!strcmp(iflag, "OI"))

			flagval += 0x1;

		else if (!strcmp(iflag, "CI"))

			flagval += 0x2;

		else if (!strcmp(iflag, "NP"))

			flagval += 0x4;

		else if (!strcmp(iflag, "IO"))

			flagval += 0x8;

		else if (!strcmp(iflag, "I"))

			flagval += 0x10;

		else

			return 0x0; /* Invalid flag */

		iflag = strtok(NULL, "|"); /* everything before | */

	}

	return flagval;

}

static int

verify_ace_flags(char *flagstr, uint8_t *flagval)

{

	char *invalflag;

	if (!strcmp(flagstr, "0") || !strcmp(flagstr, "0x0"))

		return 0;

	if (strstr(flagstr, "0x")) { /* hex flag value */

		*flagval = strtol(flagstr, &invalflag, 16);

		if (strlen(invalflag)) {

			printf("%s: Invalid flags: %s\n", __func__, flagstr);

			return 1;

		}

	} else

		*flagval = ace_flag_value(flagstr);

	if (!*flagval || (*flagval & ~VFLAGS)) {

		printf("%s: Invalid flag %s and value: 0x%x\n",

			__func__, flagstr, *flagval);

		return 1;

	}

	return 0;

}

static uint32_t

ace_mask_value(char *mask)

{

	uint32_t maskval = 0;

	char cur;

	if (!strcmp(mask, "FULL"))

		return FULL_CONTROL;

	if (!strcmp(mask, "CHANGE"))

		return CHANGE;

	if (!strcmp(mask, "READ"))

		return EREAD;

	while((cur = *mask++)) {

		switch(cur) {

		case 'R':

			maskval |= EREAD;

			break;

		case 'W':

			maskval |= EWRITE;

			break;

		case 'X':

			maskval |= EXEC;

			break;

		case 'D':

			maskval |= DELETE;

			break;

		case 'P':

			maskval |= WRITE_DAC;

			break;

		case 'O':

			maskval |= WRITE_OWNER;

			break;

		default:

			return 0;

		}

	}

	return maskval;

}

static int

verify_ace_mask(char *maskstr, uint32_t *maskval)

{

	unsigned long val;

	char *ep;

	errno = 0;

	val = strtoul(maskstr, &ep, 0);

	if (errno == 0 && *ep == '\0')

		*maskval = htole32((uint32_t)val);

	else

		*maskval = htole32(ace_mask_value(maskstr));

	if (!*maskval) {

		printf("%s: Invalid mask %s (value 0x%x)\n", __func__,

			maskstr, *maskval);

		return 1;

	}

	return 0;

}

#define AUTHORITY_MASK (~(0xffffffffffffULL))

static int

raw_str_to_sid(const char *str, struct cifs_sid *csid)

{

	const char *p;

	char *q;

	unsigned long long x;

	/* Sanity check for either "S-" or "s-" */

	if ((str[0] != 'S' && str[0] != 's') || (str[1]!='-')) {

		plugin_errmsg = "SID string does not start with \"S-\"";

		return -EINVAL;

	}

	/* Get the SID revision number */

	p = str + 2;

	x = strtoull(p, &q, 10);

	if (x == 0 || x > UCHAR_MAX || !q || *q != '-') {

		plugin_errmsg = "Invalid SID revision number";

		return -EINVAL;

	}

	csid->revision = (uint8_t)x;

	/*

	 * Next the Identifier Authority. This is stored in big-endian in a

	 * 6 byte array. If the authority value is > UINT_MAX, then it should

	 * be expressed as a hex value.

	 */

	p = q + 1;

	x = strtoull(p, &q, 0);

	if ((x & AUTHORITY_MASK) || !q || *q !='-') {

		plugin_errmsg = "Invalid SID authority";

		return -EINVAL;

	}

	csid->authority[5] = (x & 0x0000000000ffULL);

	csid->authority[4] = (x & 0x00000000ff00ULL) >> 8;

	csid->authority[3] = (x & 0x000000ff0000ULL) >> 16;

	csid->authority[2] = (x & 0x0000ff000000ULL) >> 24;

	csid->authority[1] = (x & 0x00ff00000000ULL) >> 32;

	csid->authority[0] = (x & 0xff0000000000ULL) >> 40;

	/* now read the the subauthorities and store as __le32 vals */

	p = q + 1;

	csid->num_subauth = 0;

	while (csid->num_subauth < SID_MAX_SUB_AUTHORITIES) {

		x = strtoul(p, &q, 10);

		if (p == q)

			break;

		if (x > UINT_MAX) {

			plugin_errmsg = "Invalid sub authority value";

			return -EINVAL;

		}

		csid->sub_auth[csid->num_subauth++] = htole32((uint32_t)x);

		if (*q != '-')

			break;

		p = q + 1;

	}

	/* IF we ended early, then the SID could not be converted */

	if (q && *q != '\0') {

		plugin_errmsg = "Invalid sub authority value";

		return -EINVAL;

	}

	return 0;

}

static int

setcifsacl_str_to_sid(const char *str, struct cifs_sid *sid)

{

	if (plugin_loaded)

		return str_to_sid(plugin_handle, str, sid);

	return raw_str_to_sid(str, sid);

}

static struct cifs_ace **

build_cmdline_aces(char **arrptr, int numcaces)

{

	int i;

	char *acesid, *acetype, *aceflag, *acemask;

	struct cifs_ace **cacesptr;

	cacesptr = calloc(numcaces, sizeof(struct cifs_aces *));

	if (!cacesptr) {

		printf("%s: Error %d allocating ACE array", __func__, errno);

		return NULL;

	}

	for (i = 0; i < numcaces; ++i) {

		acesid = strtok(arrptr[i], ":");

		acetype = strtok(NULL, "/");

		aceflag = strtok(NULL, "/");

		acemask = strtok(NULL, "/");

		if (!acesid || !acetype || !aceflag || !acemask) {

			printf("%s: Incomplete ACE: %s\n", __func__, arrptr[i]);

			goto build_cmdline_aces_ret;

		}

		cacesptr[i] = malloc(sizeof(struct cifs_ace));

		if (!cacesptr[i]) {

			printf("%s: ACE alloc error %d\n", __func__, errno);

			goto build_cmdline_aces_ret;

		}

		if (setcifsacl_str_to_sid(acesid, &cacesptr[i]->sid)) {

			printf("%s: Invalid SID (%s): %s\n", __func__, arrptr[i],

				plugin_errmsg);

			goto build_cmdline_aces_ret;

		}

		if (verify_ace_type(acetype, &cacesptr[i]->type)) {

			printf("%s: Invalid ACE type: %s\n",

					__func__, arrptr[i]);

			goto build_cmdline_aces_ret;

		}

		if (verify_ace_flags(aceflag, &cacesptr[i]->flags)) {

			printf("%s: Invalid ACE flag: %s\n",

				__func__, arrptr[i]);

			goto build_cmdline_aces_ret;

		}

		if (verify_ace_mask(acemask, &cacesptr[i]->access_req)) {

			printf("%s: Invalid ACE mask: %s\n",

				__func__, arrptr[i]);

			goto build_cmdline_aces_ret;

		}

		cacesptr[i]->size = htole16(1 + 1 + 2 + 4 + 1 + 1 + 6 +

					    cacesptr[i]->sid.num_subauth * 4);

	}

	return cacesptr;

build_cmdline_aces_ret:

	for (i = 0; i < numcaces; ++i)

		free(cacesptr[i]);

	free(cacesptr);

	return NULL;

}

static char **

parse_cmdline_aces(char *acelist, int numcaces)

{

	int i = 0;

	char *acestr, *vacestr, **arrptr = NULL;

	arrptr = (char **)malloc(numcaces * sizeof(char *));

	if (!arrptr) {

		printf("%s: Unable to allocate char array\n", __func__);

		return NULL;

	}

	while (i < numcaces) {

		acestr = strtok(acelist, ","); /* everything before , */

		if (!acestr)

			goto parse_cmdline_aces_err;

		vacestr = strstr(acestr, "ACL:"); /* ace as ACL:*" */

		if (!vacestr)

			goto parse_cmdline_aces_err;

		vacestr += 4; /* skip past "ACL:" */

		if (*vacestr) {

			arrptr[i] = vacestr;

			++i;

		}

		acelist = NULL;

	}

	return arrptr;

parse_cmdline_aces_err:

	printf("%s: Error parsing ACEs\n", __func__);

	free(arrptr);

	return NULL;

}

/* How many aces were provided on the command-line? Count the commas. */

static unsigned int

get_numcaces(const char *aces)

{

	unsigned int num = 1;

	const char *current;

	current = aces;

	while((current = strchr(current, ','))) {

		++current;

		++num;

	}

	return num;

}

static int

setacl_action(struct cifs_ntsd *pntsd, struct cifs_ntsd **npntsd,

		ssize_t *bufsize, struct cifs_ace **facesptr, int numfaces,

		struct cifs_ace **cacesptr, int numcaces,

		enum setcifsacl_actions maction)

{

	int rc = 1;

	switch (maction) {

	case ActDelete:

		rc = ace_delete(pntsd, npntsd, bufsize, facesptr,

				numfaces, cacesptr, numcaces);

		break;

	case ActModify:

		rc = ace_modify(pntsd, npntsd, bufsize, facesptr,

				numfaces, cacesptr, numcaces);

		break;

	case ActAdd:

		rc = ace_add(pntsd, npntsd, bufsize, facesptr,

				numfaces, cacesptr, numcaces);

		break;

	case ActSet:

		rc = ace_set(pntsd, npntsd, bufsize, cacesptr, numcaces);

		break;

	default:

		printf("%s: Invalid action: %d\n", __func__, maction);

		break;

	}

	return rc;

}

static void

setcifsacl_usage(const char *prog)

{

	fprintf(stderr,

	"%s: Alter CIFS/NTFS ACL in a security descriptor of a file object\n",

		prog);

	fprintf(stderr, "Usage: %s option <list_of_ACEs> <file_name>\n", prog);

	fprintf(stderr, "Valid options:\n");

	fprintf(stderr, "\t-v	Version of the program\n");

	fprintf(stderr, "\n\t-a	Add ACE(s), separated by a comma, to an ACL\n");

	fprintf(stderr,

	"\tsetcifsacl -a \"ACL:Administrator:ALLOWED/0x0/FULL\" <file_name>\n");

	fprintf(stderr, "\n");

	fprintf(stderr,

	"\t-D	Delete ACE(s), separated by a comma, from an ACL\n");

	fprintf(stderr,

	"\tsetcifsacl -D \"ACL:Administrator:DENIED/0x0/D\" <file_name>\n");

	fprintf(stderr, "\n");

	fprintf(stderr,

	"\t-M	Modify ACE(s), separated by a comma, in an ACL\n");

	fprintf(stderr,

	"\tsetcifsacl -M \"ACL:user1:ALLOWED/0x0/0x1e01ff\" <file_name>\n");

	fprintf(stderr,

	"\n\t-S	Replace existing ACL with ACE(s), separated by a comma\n");

	fprintf(stderr,

	"\tsetcifsacl -S \"ACL:Administrator:ALLOWED/0x0/D\" <file_name>\n");

	fprintf(stderr, "\nRefer to setcifsacl(1) manpage for details\n");

}

int

main(const int argc, char *const argv[])

{

	int i, rc, c, numcaces, numfaces;

	enum setcifsacl_actions maction = ActUnknown;

	ssize_t attrlen, bufsize = BUFSIZE;

	char *ace_list, *filename, *attrval, **arrptr = NULL;

	struct cifs_ctrl_acl *daclptr = NULL;

	struct cifs_ace **cacesptr = NULL, **facesptr = NULL;

	struct cifs_ntsd *ntsdptr = NULL;

	c = getopt(argc, argv, "hvD:M:a:S:");

	switch (c) {

	case 'D':

		maction = ActDelete;

		ace_list = optarg;

		break;

	case 'M':

		maction = ActModify;

		ace_list = optarg;

		break;

	case 'a':

		maction = ActAdd;

		ace_list = optarg;

		break;

	case 'S':

		maction = ActSet;

		ace_list = optarg;

		break;

	case 'h':

		setcifsacl_usage(basename(argv[0]));

		return 0;

	case 'v':

		printf("Version: %s\n", VERSION);

		return 0;

	default:

		setcifsacl_usage(basename(argv[0]));

		return -1;

	}

	/* We expect 1 argument in addition to the option */

	if (argc != 4) {

		setcifsacl_usage(basename(argv[0]));

		return -1;

	}

	filename = argv[3];

	if (!ace_list) {

		printf("%s: No valid ACEs specified\n", __func__);

		return -1;

	}