[apple/libc.git] / sys / statx_np.c

/*
 * Copyright (c) 2004, 2006 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
#include <sys/types.h>
#include <sys/acl.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>

#include <string.h>
#include <stdio.h>

#define ACL_MIN_SIZE_HEURISTIC (sizeof(struct kauth_filesec) + 16 * sizeof(struct kauth_ace))

static int	statx_syscall(void *obj, void  *sbptr, void *fsacl, size_t *fsacl_size);
static int	fstatx_syscall(void *obj, void  *sbptr, void *fsacl, size_t *fsacl_size);
static int	lstatx_syscall(void *obj, void  *sbptr, void *fsacl, size_t *fsacl_size);

static int	statx1(void *obj,
		       int (* stat_syscall)(void *obj, void *sbptr, void *fsacl, size_t *fsacl_size),
		       void *sbptr, filesec_t fsec);

/*
 * Stat interfaces.
 */
int
statx_np(const char *path, struct stat *sb, filesec_t fsec)
{
	if (fsec == NULL)
		return(stat(path, sb));
	return(statx1((void *)&path, statx_syscall, (void *)sb, fsec));
}

int
fstatx_np(int fd, struct stat *sb, filesec_t fsec)
{
	if (fsec == NULL)
		return(fstat(fd, sb));
	return(statx1((void *)&fd, fstatx_syscall, (void *)sb, fsec));
}

int
lstatx_np(const char *path, struct stat *sb, filesec_t fsec)
{
	if (fsec == NULL)
		return(lstat(path, sb));
	return(statx1((void *)&path, lstatx_syscall, (void *)sb, fsec));
}


#if __DARWIN_64_BIT_INO_T
int
statx64_np(const char *path, struct stat64 *sb, filesec_t fsec)
{
	return(statx_np(path, (struct stat *)sb, fsec));
}

int
fstatx64_np(int fd, struct stat64 *sb, filesec_t fsec)
{
	return(fstatx_np(fd, (struct stat *)sb, fsec));
}

int
lstatx64_np(const char *path, struct stat64 *sb, filesec_t fsec)
{
	return(lstatx_np(path, (struct stat *)sb, fsec));
}
#endif /* __DARWIN_64_BIT_INO_T */

/*
 * Stat syscalls
 */
#if __DARWIN_64_BIT_INO_T
extern int __fstat64_extended(int, struct stat *, void *, size_t *);
extern int __lstat64_extended(const char *, struct stat *, void *, size_t *);
extern int __stat64_extended(const char *, struct stat *, void *, size_t *);
#else /* !__DARWIN_64_BIT_INO_T */
extern int __fstat_extended(int, struct stat *, void *, size_t *);
extern int __lstat_extended(const char *, struct stat *, void *, size_t *);
extern int __stat_extended(const char *, struct stat *, void *, size_t *);
#endif /* __DARWIN_64_BIT_INO_T */

static int
statx_syscall(void *obj, void  *sb, void *fsacl, size_t *fsacl_size)
{
	const char *path = *(const char **)obj;
#if __DARWIN_64_BIT_INO_T
	return(__stat64_extended(path, (struct stat *)sb, fsacl, fsacl_size));
#else /* !__DARWIN_64_BIT_INO_T */
	return(__stat_extended(path, (struct stat *)sb, fsacl, fsacl_size));
#endif /* __DARWIN_64_BIT_INO_T */
}

static int
fstatx_syscall(void *obj, void  *sb, void *fsacl, size_t *fsacl_size)
{
	int fd = *(int *)obj;
#if __DARWIN_64_BIT_INO_T
	return(__fstat64_extended(fd, (struct stat *)sb, fsacl, fsacl_size));
#else /* !__DARWIN_64_BIT_INO_T */
	return(__fstat_extended(fd, (struct stat *)sb, fsacl, fsacl_size));
#endif /* __DARWIN_64_BIT_INO_T */
}

static int
lstatx_syscall(void *obj, void  *sb, void *fsacl, size_t *fsacl_size)
{
	const char *path = *(const char **)obj;
#if __DARWIN_64_BIT_INO_T
	return(__lstat64_extended(path, (struct stat *)sb, fsacl, fsacl_size));
#else /* !__DARWIN_64_BIT_INO_T */
	return(__lstat_extended(path, (struct stat *)sb, fsacl, fsacl_size));
#endif /* __DARWIN_64_BIT_INO_T */
}

/*
 * Stat internals
 */
static int
statx1(void *obj,
    int (* stat_syscall)(void *obj, void *sbptr, void *fsacl, size_t *fsacl_size),
    void  *sbptr, filesec_t fsec)
{
	struct kauth_filesec *fsacl, *ofsacl;
	size_t fsacl_size, buffer_size;
	int error;
	struct stat * sb = (struct stat *)0;

	fsacl = NULL;
	error = 0;
	
	sb = (struct stat *)sbptr;
		
	/*
	 * Allocate an initial buffer.
	 */
	if ((fsacl = malloc(ACL_MIN_SIZE_HEURISTIC)) == NULL) {
		error = ENOMEM;
		goto out;
	}		
	buffer_size = ACL_MIN_SIZE_HEURISTIC;

	/*
	 * Loop until we have the ACL.
	 */
	for (;;) {
		fsacl_size = buffer_size;

		if ((error = stat_syscall(obj, sbptr, fsacl, &fsacl_size)) != 0)
			goto out;

		/*
		 * No error, did we get the ACL?
		 */
		if (fsacl_size <= buffer_size)
			break;

		/* no, use supplied buffer size plus some padding */
		ofsacl = fsacl;
		fsacl = realloc(fsacl, fsacl_size + sizeof(struct kauth_ace) * 2);
		if (fsacl == NULL) {
			fsacl = ofsacl;
			errno = ENOMEM;
			goto out;
		}
		buffer_size = fsacl_size;
	}
	
	/* populate filesec with values from stat */
	filesec_set_property(fsec, FILESEC_OWNER, &(sb->st_uid));
	filesec_set_property(fsec, FILESEC_GROUP, &(sb->st_gid));
	filesec_set_property(fsec, FILESEC_MODE, &(sb->st_mode));

	/* if we got a kauth_filesec, take values from there too */
	if (fsacl_size >= sizeof(struct kauth_filesec)) {
		filesec_set_property(fsec, FILESEC_UUID, &fsacl->fsec_owner);
		filesec_set_property(fsec, FILESEC_GRPUUID, &fsacl->fsec_group);
		
		/* check to see whether there's actually an ACL here */
		if (fsacl->fsec_acl.acl_entrycount != KAUTH_FILESEC_NOACL) {
		    filesec_set_property(fsec, FILESEC_ACL_ALLOCSIZE, &fsacl_size);
		    filesec_set_property(fsec, FILESEC_ACL_RAW, &fsacl);
		    fsacl = NULL;	/* avoid freeing it below */
		} else {
		    filesec_set_property(fsec, FILESEC_ACL_ALLOCSIZE, NULL);
		    filesec_set_property(fsec, FILESEC_ACL_RAW, NULL);
		}
	} else {
		filesec_set_property(fsec, FILESEC_UUID, NULL);
		filesec_set_property(fsec, FILESEC_GRPUUID, NULL);
		filesec_set_property(fsec, FILESEC_ACL_ALLOCSIZE, NULL);
		filesec_set_property(fsec, FILESEC_ACL_RAW, NULL);
	}
out:
	if (fsacl != NULL)
		free(fsacl);
	return(error);
}
Commit	Line	Data
3d9156a7	1	/*
224c7076	2	* Copyright (c) 2004, 2006 Apple Computer, Inc. All rights reserved.
3d9156a7 A	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
	12	*
	13	* The Original Code and all software distributed under the License are
	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
	23	#include <sys/types.h>
	24	#include <sys/acl.h>
	25	#include <sys/stat.h>
	26	#include <errno.h>
	27	#include <stdlib.h>
3d9156a7 A	28	#include <unistd.h>
	29	#include <fcntl.h>
	30
	31	#include <string.h>
	32	#include <stdio.h>
	33
	34	#define ACL_MIN_SIZE_HEURISTIC (sizeof(struct kauth_filesec) + 16 * sizeof(struct kauth_ace))
	35
224c7076 A	36	static int statx_syscall(void obj, void sbptr, void fsacl, size_t fsacl_size);
	37	static int fstatx_syscall(void obj, void sbptr, void fsacl, size_t fsacl_size);
	38	static int lstatx_syscall(void obj, void sbptr, void fsacl, size_t fsacl_size);
3d9156a7 A	39
3d9156a7 A	40	static int statx1(void *obj,
224c7076 A	41	int (* stat_syscall)(void obj, void sbptr, void fsacl, size_t fsacl_size),
224c7076 A	42	void *sbptr, filesec_t fsec);
3d9156a7 A	43
	44	/*
	45	* Stat interfaces.
	46	*/
	47	int
	48	statx_np(const char path, struct stat sb, filesec_t fsec)
	49	{
	50	if (fsec == NULL)
	51	return(stat(path, sb));
224c7076	52	return(statx1((void )&path, statx_syscall, (void )sb, fsec));
3d9156a7 A	53	}
	54
	55	int
	56	fstatx_np(int fd, struct stat *sb, filesec_t fsec)
	57	{
	58	if (fsec == NULL)
	59	return(fstat(fd, sb));
224c7076	60	return(statx1((void )&fd, fstatx_syscall, (void )sb, fsec));
3d9156a7 A	61	}
	62
	63	int
	64	lstatx_np(const char path, struct stat sb, filesec_t fsec)
	65	{
	66	if (fsec == NULL)
	67	return(lstat(path, sb));
224c7076	68	return(statx1((void )&path, lstatx_syscall, (void )sb, fsec));
3d9156a7 A	69	}
3d9156a7 A	70
224c7076 A	71
	72	#if __DARWIN_64_BIT_INO_T
	73	int
	74	statx64_np(const char path, struct stat64 sb, filesec_t fsec)
	75	{
	76	return(statx_np(path, (struct stat *)sb, fsec));
	77	}
	78
	79	int
	80	fstatx64_np(int fd, struct stat64 *sb, filesec_t fsec)
	81	{
	82	return(fstatx_np(fd, (struct stat *)sb, fsec));
	83	}
	84
	85	int
	86	lstatx64_np(const char path, struct stat64 sb, filesec_t fsec)
	87	{
	88	return(lstatx_np(path, (struct stat *)sb, fsec));
	89	}
	90	#endif /* __DARWIN_64_BIT_INO_T */
	91
3d9156a7 A	92	/*
	93	* Stat syscalls
	94	*/
224c7076 A	95	#if __DARWIN_64_BIT_INO_T
	96	extern int __fstat64_extended(int, struct stat , void , size_t *);
	97	extern int __lstat64_extended(const char , struct stat , void , size_t );
	98	extern int __stat64_extended(const char , struct stat , void , size_t );
	99	#else /* !__DARWIN_64_BIT_INO_T */
	100	extern int __fstat_extended(int, struct stat , void , size_t *);
	101	extern int __lstat_extended(const char , struct stat , void , size_t );
	102	extern int __stat_extended(const char , struct stat , void , size_t );
	103	#endif /* __DARWIN_64_BIT_INO_T */
	104
3d9156a7	105	static int
224c7076	106	statx_syscall(void obj, void sb, void fsacl, size_t fsacl_size)
3d9156a7 A	107	{
3d9156a7 A	108	const char path = (const char **)obj;
224c7076 A	109	#if __DARWIN_64_BIT_INO_T
	110	return(__stat64_extended(path, (struct stat *)sb, fsacl, fsacl_size));
	111	#else /* !__DARWIN_64_BIT_INO_T */
	112	return(__stat_extended(path, (struct stat *)sb, fsacl, fsacl_size));
	113	#endif /* __DARWIN_64_BIT_INO_T */
3d9156a7 A	114	}
	115
	116	static int
224c7076	117	fstatx_syscall(void obj, void sb, void fsacl, size_t fsacl_size)
3d9156a7 A	118	{
3d9156a7 A	119	int fd = (int )obj;
224c7076 A	120	#if __DARWIN_64_BIT_INO_T
	121	return(__fstat64_extended(fd, (struct stat *)sb, fsacl, fsacl_size));
	122	#else /* !__DARWIN_64_BIT_INO_T */
	123	return(__fstat_extended(fd, (struct stat *)sb, fsacl, fsacl_size));
	124	#endif /* __DARWIN_64_BIT_INO_T */
3d9156a7 A	125	}
	126
	127	static int
224c7076	128	lstatx_syscall(void obj, void sb, void fsacl, size_t fsacl_size)
3d9156a7 A	129	{
3d9156a7 A	130	const char path = (const char **)obj;
224c7076 A	131	#if __DARWIN_64_BIT_INO_T
	132	return(__lstat64_extended(path, (struct stat *)sb, fsacl, fsacl_size));
	133	#else /* !__DARWIN_64_BIT_INO_T */
	134	return(__lstat_extended(path, (struct stat *)sb, fsacl, fsacl_size));
	135	#endif /* __DARWIN_64_BIT_INO_T */
3d9156a7 A	136	}
	137
	138	/*
	139	* Stat internals
	140	*/
	141	static int
	142	statx1(void *obj,
224c7076 A	143	int (* stat_syscall)(void obj, void sbptr, void fsacl, size_t fsacl_size),
224c7076 A	144	void *sbptr, filesec_t fsec)
3d9156a7 A	145	{
	146	struct kauth_filesec fsacl, ofsacl;
	147	size_t fsacl_size, buffer_size;
	148	int error;
224c7076	149	struct stat * sb = (struct stat *)0;
3d9156a7 A	150
	151	fsacl = NULL;
	152	error = 0;
	153
224c7076 A	154	sb = (struct stat *)sbptr;
224c7076 A	155
3d9156a7 A	156	/*
	157	* Allocate an initial buffer.
	158	*/
	159	if ((fsacl = malloc(ACL_MIN_SIZE_HEURISTIC)) == NULL) {
	160	error = ENOMEM;
	161	goto out;
	162	}
	163	buffer_size = ACL_MIN_SIZE_HEURISTIC;
	164
	165	/*
	166	* Loop until we have the ACL.
	167	*/
	168	for (;;) {
	169	fsacl_size = buffer_size;
224c7076 A	170
224c7076 A	171	if ((error = stat_syscall(obj, sbptr, fsacl, &fsacl_size)) != 0)
3d9156a7 A	172	goto out;
	173
	174	/*
	175	* No error, did we get the ACL?
	176	*/
	177	if (fsacl_size <= buffer_size)
	178	break;
	179
	180	/* no, use supplied buffer size plus some padding */
	181	ofsacl = fsacl;
	182	fsacl = realloc(fsacl, fsacl_size + sizeof(struct kauth_ace) * 2);
	183	if (fsacl == NULL) {
	184	fsacl = ofsacl;
	185	errno = ENOMEM;
	186	goto out;
	187	}
	188	buffer_size = fsacl_size;
	189	}
	190
	191	/* populate filesec with values from stat */
	192	filesec_set_property(fsec, FILESEC_OWNER, &(sb->st_uid));
	193	filesec_set_property(fsec, FILESEC_GROUP, &(sb->st_gid));
	194	filesec_set_property(fsec, FILESEC_MODE, &(sb->st_mode));
	195
	196	/* if we got a kauth_filesec, take values from there too */
	197	if (fsacl_size >= sizeof(struct kauth_filesec)) {
	198	filesec_set_property(fsec, FILESEC_UUID, &fsacl->fsec_owner);
	199	filesec_set_property(fsec, FILESEC_GRPUUID, &fsacl->fsec_group);
	200
	201	/* check to see whether there's actually an ACL here */
	202	if (fsacl->fsec_acl.acl_entrycount != KAUTH_FILESEC_NOACL) {
	203	filesec_set_property(fsec, FILESEC_ACL_ALLOCSIZE, &fsacl_size);
	204	filesec_set_property(fsec, FILESEC_ACL_RAW, &fsacl);
	205	fsacl = NULL; /* avoid freeing it below */
	206	} else {
	207	filesec_set_property(fsec, FILESEC_ACL_ALLOCSIZE, NULL);
	208	filesec_set_property(fsec, FILESEC_ACL_RAW, NULL);
	209	}
	210	} else {
	211	filesec_set_property(fsec, FILESEC_UUID, NULL);
	212	filesec_set_property(fsec, FILESEC_GRPUUID, NULL);
	213	filesec_set_property(fsec, FILESEC_ACL_ALLOCSIZE, NULL);
	214	filesec_set_property(fsec, FILESEC_ACL_RAW, NULL);
	215	}
	216	out:
	217	if (fsacl != NULL)
	218	free(fsacl);
	219	return(error);
	220	}