minix/lib/libc/gen/extattr.c

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/* $NetBSD: extattr.c,v 1.4 2012/03/13 21:13:34 christos Exp $ */
/*-
* Copyright (c) 2001 Robert N. M. Watson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* TrustedBSD: Utility functions for extended attributes.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: extattr.c,v 1.4 2012/03/13 21:13:34 christos Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/extattr.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
const int extattr_namespaces[] = {
EXTATTR_NAMESPACE_USER,
EXTATTR_NAMESPACE_SYSTEM,
0,
};
int
extattr_namespace_to_string(int attrnamespace, char **string)
{
switch(attrnamespace) {
case EXTATTR_NAMESPACE_USER:
if (string != NULL) {
if ((*string =
strdup(EXTATTR_NAMESPACE_USER_STRING)) == NULL)
return (-1);
}
return (0);
case EXTATTR_NAMESPACE_SYSTEM:
if (string != NULL)
if ((*string =
strdup(EXTATTR_NAMESPACE_SYSTEM_STRING)) == NULL)
return (-1);
return (0);
default:
errno = EINVAL;
return (-1);
}
}
int
extattr_string_to_namespace(const char *string, int *attrnamespace)
{
if (strcmp(string, EXTATTR_NAMESPACE_USER_STRING) == 0) {
if (attrnamespace != NULL)
*attrnamespace = EXTATTR_NAMESPACE_USER;
return (0);
} else if (strcmp(string, EXTATTR_NAMESPACE_SYSTEM_STRING) == 0) {
if (attrnamespace != NULL)
*attrnamespace = EXTATTR_NAMESPACE_SYSTEM;
return (0);
} else {
errno = EINVAL;
return (-1);
}
}
int
extattr_copy_fd(int from_fd, int to_fd, int namespace)
{
ssize_t llen, vlen, maxvlen;
size_t alen;
void *alist = NULL;
void *aval = NULL;
size_t i;
int error = -1;
llen = extattr_list_fd(from_fd, namespace, NULL, 0);
if (llen == -1) {
/* Silently ignore when EA are not supported */
if (errno == EOPNOTSUPP)
error = 0;
goto out;
}
if (llen == 0) {
error = 0;
goto out;
}
if ((alist = malloc((size_t)llen)) == NULL)
goto out;
llen = extattr_list_fd(from_fd, namespace, alist, (size_t)llen);
if (llen == -1)
goto out;
maxvlen = 1024;
if ((aval = malloc((size_t)maxvlen)) == NULL)
goto out;
for (i = 0; i < (size_t)llen; i += alen + 1) {
char aname[NAME_MAX + 1];
char *ap;
alen = ((uint8_t *)alist)[i];
ap = ((char *)alist) + i + 1;
(void)memcpy(aname, ap, alen);
aname[alen] = '\0';
vlen = extattr_get_fd(from_fd, namespace, aname, NULL, 0);
if (vlen == -1)
goto out;
if (vlen > maxvlen) {
if ((aval = realloc(aval, (size_t)vlen)) == NULL)
goto out;
maxvlen = vlen;
}
if ((vlen = extattr_get_fd(from_fd, namespace, aname,
aval, (size_t)vlen)) == -1)
goto out;
if (extattr_set_fd(to_fd, namespace, aname,
aval, (size_t)vlen) != vlen)
goto out;
}
error = 0;
out:
if (aval != NULL)
free(aval);
if (alist != NULL)
free(alist);
return error;
}
int
extattr_copy_file(const char *from, const char *to, int namespace)
{
ssize_t llen, vlen, maxvlen;
size_t alen;
void *alist = NULL;
void *aval = NULL;
size_t i;
int error = -1;
llen = extattr_list_file(from, namespace, NULL, 0);
if (llen == -1) {
/* Silently ignore when EA are not supported */
if (errno == EOPNOTSUPP)
error = 0;
goto out;
}
if (llen == 0) {
error = 0;
goto out;
}
if ((alist = malloc((size_t)llen)) == NULL)
goto out;
llen = extattr_list_file(from, namespace, alist, (size_t)llen);
if (llen == -1)
goto out;
maxvlen = 1024;
if ((aval = malloc((size_t)maxvlen)) == NULL)
goto out;
for (i = 0; i < (size_t)llen; i += alen + 1) {
char aname[NAME_MAX + 1];
char *ap;
alen = ((uint8_t *)alist)[i];
ap = ((char *)alist) + i + 1;
(void)memcpy(aname, ap, alen);
aname[alen] = '\0';
vlen = extattr_get_file(from, namespace, aname, NULL, 0);
if (vlen == -1)
goto out;
if (vlen > maxvlen) {
if ((aval = realloc(aval, (size_t)vlen)) == NULL)
goto out;
maxvlen = vlen;
}
if ((vlen = extattr_get_file(from, namespace, aname, aval, (size_t)vlen)) == -1)
goto out;
if (extattr_set_file(to, namespace, aname,
aval, (size_t)vlen) != vlen)
goto out;
}
error = 0;
out:
if (aval != NULL)
free(aval);
if (alist != NULL)
free(alist);
return error;
}
int
extattr_copy_link(const char *from, const char *to, int namespace)
{
ssize_t llen, vlen, maxvlen;
size_t alen;
void *alist = NULL;
void *aval = NULL;
size_t i;
int error = -1;
llen = extattr_list_link(from, namespace, NULL, 0);
if (llen == -1) {
/* Silently ignore when EA are not supported */
if (errno == EOPNOTSUPP)
error = 0;
goto out;
}
if (llen == 0) {
error = 0;
goto out;
}
if ((alist = malloc((size_t)llen)) == NULL)
goto out;
llen = extattr_list_link(from, namespace, alist, (size_t)llen);
if (llen == -1)
goto out;
maxvlen = 1024;
if ((aval = malloc((size_t)maxvlen)) == NULL)
goto out;
for (i = 0; i < (size_t)llen; i += alen + 1) {
char aname[NAME_MAX + 1];
char *ap;
alen = ((uint8_t *)alist)[i];
ap = ((char *)alist) + i + 1;
(void)memcpy(aname, ap, alen);
aname[alen] = '\0';
vlen = extattr_get_link(from, namespace, aname, NULL, 0);
if (vlen == -1)
goto out;
if (vlen > maxvlen) {
if ((aval = realloc(aval, (size_t)vlen)) == NULL)
goto out;
maxvlen = vlen;
}
if ((vlen = extattr_get_link(from, namespace, aname,
aval, (size_t)vlen)) == -1)
goto out;
if (extattr_set_link(to, namespace, aname,
aval, (size_t)vlen) != vlen)
goto out;
}
error = 0;
out:
if (aval != NULL)
free(aval);
if (alist != NULL)
free(alist);
return error;
}
static int
extattr_namespace_access(int namespace, int mode)
{
switch (namespace) {
case EXTATTR_NAMESPACE_SYSTEM:
if ((mode & (R_OK|W_OK)) && getuid() != 0)
return -1;
break;
default:
break;
}
return 0;
}
int
fcpxattr(int from_fd, int to_fd)
{
const int *ns;
int error;
for (ns = extattr_namespaces; *ns; ns++) {
if (extattr_namespace_access(*ns, R_OK|W_OK) != 0)
continue;
if ((error = extattr_copy_fd(from_fd, to_fd, *ns)) != 0)
return error;
}
return 0;
}
int
cpxattr(const char *from, const char *to)
{
const int *ns;
int error;
for (ns = extattr_namespaces; *ns; ns++) {
if (extattr_namespace_access(*ns, R_OK|W_OK) != 0)
continue;
if ((error = extattr_copy_file(from, to, *ns)) != 0)
return error;
}
return 0;
}
int
lcpxattr(const char *from, const char *to)
{
const int *ns;
int error;
for (ns = extattr_namespaces; *ns; ns++) {
if (extattr_namespace_access(*ns, R_OK|W_OK) != 0)
continue;
if ((error = extattr_copy_link(from, to, *ns)) != 0)
return error;
}
return 0;
}