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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* apply_xattr.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "mkfs.h"
#ifdef HAVE_SYS_XATTR_H
static char *get_full_path(const char *prefix, tree_node_t *node)
{
char *path = NULL, *new = NULL;
size_t path_len, prefix_len;
int ret;
path = fstree_get_path(node);
if (path == NULL)
goto fail;
ret = canonicalize_name(path);
assert(ret == 0);
path_len = strlen(path);
prefix_len = strlen(prefix);
while (prefix_len > 0 && prefix[prefix_len - 1] == '/')
--prefix_len;
if (prefix_len > 0) {
new = realloc(path, path_len + prefix_len + 2);
if (new == NULL)
goto fail;
path = new;
memmove(path + prefix_len + 1, path, path_len + 1);
memcpy(path, prefix, prefix_len);
path[prefix_len] = '/';
}
return path;
fail:
perror("getting full path for xattr scan");
free(path);
return NULL;
}
static int xattr_from_path(sqfs_xattr_writer_t *xwr, const char *path)
{
char *key, *value = NULL, *buffer = NULL;
ssize_t buflen, vallen, keylen;
int ret;
buflen = llistxattr(path, NULL, 0);
if (buflen < 0) {
fprintf(stderr, "llistxattr %s: %s", path, strerror(errno));
return -1;
}
if (buflen == 0)
return 0;
buffer = malloc(buflen);
if (buffer == NULL) {
perror("xattr name buffer");
return -1;
}
buflen = llistxattr(path, buffer, buflen);
if (buflen == -1) {
fprintf(stderr, "llistxattr %s: %s", path, strerror(errno));
goto fail;
}
key = buffer;
while (buflen > 0) {
vallen = lgetxattr(path, key, NULL, 0);
if (vallen == -1) {
fprintf(stderr, "lgetxattr %s: %s",
path, strerror(errno));
goto fail;
}
if (vallen > 0) {
value = calloc(1, vallen);
if (value == NULL) {
perror("allocating xattr value buffer");
goto fail;
}
vallen = lgetxattr(path, key, value, vallen);
if (vallen == -1) {
fprintf(stderr, "lgetxattr %s: %s\n",
path, strerror(errno));
goto fail;
}
ret = sqfs_xattr_writer_add_kv(xwr, key, value, vallen);
if (ret) {
sqfs_perror(path,
"storing xattr key-value pairs",
ret);
goto fail;
}
free(value);
value = NULL;
}
keylen = strlen(key) + 1;
buflen -= keylen;
key += keylen;
}
free(buffer);
return 0;
fail:
free(value);
free(buffer);
return -1;
}
#endif
static int xattr_xcan_dfs(const char *path_prefix, void *selinux_handle,
sqfs_xattr_writer_t *xwr, bool scan_xattr, void *xattr_map,
tree_node_t *node)
{
char *path = NULL;
int ret;
ret = sqfs_xattr_writer_begin(xwr, 0);
if (ret) {
sqfs_perror(node->name, "recoding xattr key-value pairs\n",
ret);
return -1;
}
#ifdef HAVE_SYS_XATTR_H
if (scan_xattr) {
path = get_full_path(path_prefix, node);
if (path == NULL)
return -1;
ret = xattr_from_path(xwr, path);
free(path);
path = NULL;
if (ret) {
ret = -1;
goto out;
}
}
#else
(void)path_prefix;
#endif
if (selinux_handle != NULL || xattr_map != NULL) {
path = fstree_get_path(node);
if (path == NULL) {
perror("reconstructing absolute path");
ret = -1;
goto out;
}
}
if (xattr_map != NULL) {
ret = xattr_apply_map_file(path, xattr_map, xwr);
if (ret) {
ret = -1;
goto out;
}
}
if (selinux_handle != NULL) {
ret = selinux_relable_node(selinux_handle, xwr, node, path);
if (ret) {
ret = -1;
goto out;
}
}
if (sqfs_xattr_writer_end(xwr, &node->xattr_idx)) {
sqfs_perror(node->name, "completing xattr key-value pairs",
ret);
ret = -1;
goto out;
}
if (S_ISDIR(node->mode)) {
node = node->data.children;
while (node != NULL) {
if (xattr_xcan_dfs(path_prefix, selinux_handle, xwr,
scan_xattr, xattr_map, node)) {
ret = -1;
goto out;
}
node = node->next;
}
}
out:
free(path);
return ret;
}
int apply_xattrs(fstree_t *fs, const char *path, void *selinux_handle,
void *xattr_map, sqfs_xattr_writer_t *xwr, bool scan_xattr)
{
if (xwr == NULL)
return 0;
if (selinux_handle == NULL && !scan_xattr && xattr_map == NULL)
return 0;
return xattr_xcan_dfs(path, selinux_handle, xwr, scan_xattr, xattr_map, fs->root);
}
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