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/*
* xattr is a Linux kernel API that has to be mapped to the FreeBSD API
* code below is adopted and simplified from the 'xattr' python module
* https://github.com/xattr/xattr/blob/master/xattr/lib_build.c
*/
#include <sys/types.h>
#ifdef __FreeBSD__
#include <sys/extattr.h>
#endif
#include <string.h>
#include "xattr.h"
#ifdef __FreeBSD__
/* FreeBSD compatibility API */
/* Converts a freebsd format attribute list into a NULL terminated list.
* The first byte is the length of the following attribute.
*/
static void convert_bsd_list(char *namebuf, size_t size)
{
size_t offset = 0;
while(offset < size) {
int length = (int) (unsigned char)namebuf[offset];
memmove(namebuf+offset, namebuf+offset+1, length);
namebuf[offset+length] = '\0';
offset += length+1;
}
}
ssize_t getxattr(const char *path, const char *name,
void *value, ssize_t size, u_int32_t position,
int options)
{
if (position != 0 ||
!(options == 0 || options == XATTR_XATTR_NOFOLLOW)) {
return -1;
}
if (options & XATTR_XATTR_NOFOLLOW) {
return extattr_get_link(path, EXTATTR_NAMESPACE_USER,
name, value, size);
}
else {
return extattr_get_file(path, EXTATTR_NAMESPACE_USER,
name, value, size);
}
}
ssize_t setxattr(const char *path, const char *name,
void *value, ssize_t size, u_int32_t position,
int options)
{
int rv = 0;
int nofollow;
if (position != 0) {
return -1;
}
nofollow = options & XATTR_XATTR_NOFOLLOW;
options &= ~XATTR_XATTR_NOFOLLOW;
if (options == XATTR_XATTR_CREATE ||
options == XATTR_XATTR_REPLACE) {
/* meh. FreeBSD doesn't really have this in its
* API... Oh well.
*/
}
else if (options != 0) {
return -1;
}
if (nofollow) {
rv = extattr_set_link(path, EXTATTR_NAMESPACE_USER,
name, value, size);
}
else {
rv = extattr_set_file(path, EXTATTR_NAMESPACE_USER,
name, value, size);
}
/* freebsd returns the written length on success, not zero. */
if (rv >= 0) {
return 0;
}
else {
return rv;
}
}
ssize_t removexattr(const char *path, const char *name,
int options)
{
if (!(options == 0 ||
options == XATTR_XATTR_NOFOLLOW)) {
return -1;
}
if (options & XATTR_XATTR_NOFOLLOW) {
return extattr_delete_link(path, EXTATTR_NAMESPACE_USER, name);
}
else {
return extattr_delete_file(path, EXTATTR_NAMESPACE_USER, name);
}
}
ssize_t listxattr(const char *path, char *namebuf,
size_t size, int options)
{
ssize_t rv = 0;
if (!(options == 0 ||
options == XATTR_XATTR_NOFOLLOW)) {
return -1;
}
if (options & XATTR_XATTR_NOFOLLOW) {
rv = extattr_list_link(path, EXTATTR_NAMESPACE_USER, namebuf, size);
}
else {
rv = extattr_list_file(path, EXTATTR_NAMESPACE_USER, namebuf, size);
}
if (rv > 0 && namebuf) {
convert_bsd_list(namebuf, rv);
}
return rv;
}
ssize_t fgetxattr(int fd, const char *name, void *value,
ssize_t size, u_int32_t position, int options)
{
if (position != 0 ||
!(options == 0 || options == XATTR_XATTR_NOFOLLOW)) {
return -1;
}
if (options & XATTR_XATTR_NOFOLLOW) {
return -1;
}
else {
return extattr_get_fd(fd, EXTATTR_NAMESPACE_USER, name, value, size);
}
}
ssize_t fsetxattr(int fd, const char *name, void *value,
ssize_t size, u_int32_t position, int options)
{
int rv = 0;
int nofollow;
if (position != 0) {
return -1;
}
nofollow = options & XATTR_XATTR_NOFOLLOW;
options &= ~XATTR_XATTR_NOFOLLOW;
if (options == XATTR_XATTR_CREATE ||
options == XATTR_XATTR_REPLACE) {
/* freebsd noop */
}
else if (options != 0) {
return -1;
}
if (nofollow) {
return -1;
}
else {
rv = extattr_set_fd(fd, EXTATTR_NAMESPACE_USER,
name, value, size);
}
/* freebsd returns the written length on success, not zero. */
if (rv >= 0) {
return 0;
}
else {
return rv;
}
}
ssize_t fremovexattr(int fd, const char *name, int options)
{
if (!(options == 0 ||
options == XATTR_XATTR_NOFOLLOW)) {
return -1;
}
if (options & XATTR_XATTR_NOFOLLOW) {
return -1;
}
else {
return extattr_delete_fd(fd, EXTATTR_NAMESPACE_USER, name);
}
}
ssize_t flistxattr(int fd, char *namebuf, size_t size, int options)
{
ssize_t rv = 0;
if (!(options == 0 ||
options == XATTR_XATTR_NOFOLLOW)) {
return -1;
}
if (options & XATTR_XATTR_NOFOLLOW) {
return -1;
}
else {
rv = extattr_list_fd(fd, EXTATTR_NAMESPACE_USER, namebuf, size);
}
if (rv > 0 && namebuf) {
convert_bsd_list(namebuf, rv);
}
return rv;
}
#endif
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