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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* write_xattr.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "config.h"
#include "sqfs/xattr.h"
#include "sqfs/error.h"
#include "compat.h"
#include <string.h>
#include <stdlib.h>
static const struct {
const char *prefix;
SQFS_XATTR_TYPE type;
} xattr_types[] = {
{ "user.", SQFS_XATTR_USER },
{ "trusted.", SQFS_XATTR_TRUSTED },
{ "security.", SQFS_XATTR_SECURITY },
};
int sqfs_get_xattr_prefix_id(const char *key)
{
size_t i, len;
for (i = 0; i < sizeof(xattr_types) / sizeof(xattr_types[0]); ++i) {
len = strlen(xattr_types[i].prefix);
if (strncmp(key, xattr_types[i].prefix, len) == 0 &&
strlen(key) > len) {
return xattr_types[i].type;
}
}
return SQFS_ERROR_UNSUPPORTED;
}
const char *sqfs_get_xattr_prefix(SQFS_XATTR_TYPE id)
{
size_t i;
for (i = 0; i < sizeof(xattr_types) / sizeof(xattr_types[0]); ++i) {
if (xattr_types[i].type == id)
return xattr_types[i].prefix;
}
return NULL;
}
static sqfs_xattr_t *mkxattr(const char *prefix, const char *key,
const sqfs_u8 *value, size_t value_len)
{
size_t pfx_len = (prefix == NULL) ? 0 : strlen(prefix);
size_t key_len = strlen(key);
sqfs_xattr_t *out;
size_t len;
/* len = pfx_len + (key_len + 1) + (value_len + 1) + sizeof(*out) */
if (SZ_ADD_OV(pfx_len, key_len, &len))
return NULL;
if (SZ_ADD_OV(len, value_len, &len))
return NULL;
if (SZ_ADD_OV(len, 2, &len))
return NULL;
if (SZ_ADD_OV(len, sizeof(*out), &len))
return NULL;
out = calloc(1, len);
if (out != NULL) {
size_t value_offset = pfx_len + key_len + 1;
out->key = (const char *)out->data;
out->value = out->data + value_offset;
out->value_len = value_len;
if (prefix != NULL)
memcpy(out->data, prefix, pfx_len);
memcpy(out->data + pfx_len, key, key_len);
memcpy(out->data + value_offset, value, value_len);
}
return out;
}
sqfs_xattr_t *sqfs_xattr_create(const char *key, const sqfs_u8 *value,
size_t value_len)
{
return mkxattr(NULL, key, value, value_len);
}
int sqfs_xattr_create_prefixed(sqfs_xattr_t **out, sqfs_u16 id,
const char *key, const sqfs_u8 *value,
size_t value_len)
{
const char *prefix = sqfs_get_xattr_prefix(id & (~SQFS_XATTR_FLAG_OOL));
if (prefix == NULL) {
*out = NULL;
return SQFS_ERROR_UNSUPPORTED;
}
*out = mkxattr(prefix, key, value, value_len);
if (*out == NULL)
return SQFS_ERROR_ALLOC;
return 0;
}
sqfs_xattr_t *sqfs_xattr_list_copy(const sqfs_xattr_t *list)
{
sqfs_xattr_t *copy = NULL, *copy_last = NULL;
for (const sqfs_xattr_t *it = list; it != NULL; it = it->next) {
sqfs_xattr_t *new = mkxattr(NULL, it->key,
it->value, it->value_len);
if (new == NULL) {
sqfs_xattr_list_free(copy);
return NULL;
}
if (copy_last == NULL) {
copy = new;
} else {
copy_last->next = new;
}
copy_last = new;
}
return copy;
}
void sqfs_xattr_list_free(sqfs_xattr_t *list)
{
while (list != NULL) {
sqfs_xattr_t *old = list;
list = list->next;
free(old);
}
}
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