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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* filemap_xattr.c
*
* Copyright (C) 2022 Enno Boland <mail@eboland.de>
*/
#include "mkfs.h"
#define NEW_FILE_START "# file: "
static void print_error(const char *filename, size_t line_num, const char *err)
{
fprintf(stderr, "%s: " PRI_SZ ": %s\n", filename, line_num, err);
}
// Taken from attr-2.5.1/tools/setfattr.c
static sqfs_u8 *decode(const char *filename, size_t line_num,
const char *value, size_t *size)
{
sqfs_u8 *decoded = NULL;
if (*size == 0) {
decoded = (sqfs_u8 *)strdup("");
if (decoded == NULL)
goto fail_alloc;
return decoded;
}
if (value[0] == '0' && (value[1] == 'x' || value[1] == 'X')) {
*size = ((*size) - 2) / 2;
decoded = calloc(1, (*size) + 1);
if (decoded == NULL)
goto fail_alloc;
if (hex_decode(value + 2, (*size) * 2, decoded, *size))
goto fail_encode;
} else if (value[0] == '0' && (value[1] == 's' || value[1] == 'S')) {
size_t input_len = *size - 2;
*size = (input_len / 4) * 3;
decoded = calloc(1, (*size) + 1);
if (decoded == NULL)
goto fail_alloc;
if (base64_decode(value + 2, input_len, decoded, size))
goto fail_encode;
} else {
const char *v = value, *end = value + *size;
sqfs_u8 *d;
if (end > v + 1 && *v == '"' && *(end - 1) == '"') {
v++;
end--;
}
decoded = calloc(1, (*size) + 1);
if (decoded == NULL)
goto fail_alloc;
d = decoded;
while (v < end) {
if (v[0] == '\\') {
if (v[1] == '\\' || v[1] == '"') {
*d++ = *++v;
v++;
} else if (v[1] >= '0' && v[1] <= '7') {
int c = 0;
v++;
c = (*v++ - '0');
if (*v >= '0' && *v <= '7')
c = (c << 3) + (*v++ - '0');
if (*v >= '0' && *v <= '7')
c = (c << 3) + (*v++ - '0');
*d++ = c;
} else
*d++ = *v++;
} else
*d++ = *v++;
}
*size = d - decoded;
}
return decoded;
fail_alloc:
fprintf(stderr, "out of memory\n");
return NULL;
fail_encode:
print_error(filename, line_num, "bad input encoding");
free(decoded);
return NULL;
}
static int parse_file_name(const char *filename, size_t line_num,
char *line, struct XattrMap *map)
{
struct XattrMapPattern *current_file;
char *file_name = strdup(line + strlen(NEW_FILE_START));
if (file_name == NULL)
goto fail_alloc;
current_file = calloc(1, sizeof(struct XattrMapPattern));
if (current_file == NULL)
goto fail_alloc;
current_file->next = map->patterns;
map->patterns = current_file;
if (canonicalize_name(file_name)) {
print_error(filename, line_num, "invalid absolute path");
free(current_file);
free(file_name);
return -1;
}
current_file->path = file_name;
return 0;
fail_alloc:
fprintf(stderr, "out of memory\n");
free(file_name);
return -1;
}
static int parse_xattr(const char *filename, size_t line_num, char *key_start,
char *value_start, struct XattrMap *map)
{
size_t len;
struct XattrMapPattern *current_pattern = map->patterns;
sqfs_xattr_t *current_entry;
sqfs_u8 *value;
if (current_pattern == NULL) {
print_error(filename, line_num, "no file specified yet");
return -1;
}
len = strlen(value_start);
value = decode(filename, line_num, value_start, &len);
if (value == NULL)
return -1;
current_entry = sqfs_xattr_create(key_start, value, len);
free(value);
if (current_entry == NULL) {
print_error(filename, line_num, "out-of-memory");
return -1;
}
current_entry->next = current_pattern->entries;
current_pattern->entries = current_entry;
return 0;
}
void *
xattr_open_map_file(const char *path) {
struct XattrMap *map;
size_t line_num = 1;
char *p = NULL;
sqfs_istream_t *file = NULL;
int ret;
ret = istream_open_file(&file, path);
if (ret) {
sqfs_perror(path, NULL, ret);
return NULL;
}
map = calloc(1, sizeof(struct XattrMap));
if (map == NULL)
goto fail_close;
for (;;) {
char *line = NULL;
int ret = istream_get_line(file, &line, &line_num,
ISTREAM_LINE_LTRIM |
ISTREAM_LINE_RTRIM |
ISTREAM_LINE_SKIP_EMPTY);
if (ret < 0)
goto fail;
if (ret > 0)
break;
if (strncmp(NEW_FILE_START, line, strlen(NEW_FILE_START)) == 0) {
ret = parse_file_name(path, line_num, line, map);
} else if ((p = strchr(line, '='))) {
*(p++) = '\0';
ret = parse_xattr(path, line_num, line, p, map);
} else if (line[0] != '#') {
print_error(path, line_num, "not a key-value pair");
ret = -1;
}
++line_num;
free(line);
if (ret < 0)
goto fail;
}
sqfs_drop(file);
return map;
fail:
xattr_close_map_file(map);
fail_close:
sqfs_drop(file);
return NULL;
}
void
xattr_close_map_file(void *xattr_map) {
struct XattrMap *map = xattr_map;
while (map->patterns != NULL) {
struct XattrMapPattern *file = map->patterns;
map->patterns = file->next;
sqfs_xattr_list_free(file->entries);
free(file->path);
free(file);
}
free(xattr_map);
}
int
xattr_apply_map_file(char *path, void *map, sqfs_xattr_writer_t *xwr) {
struct XattrMap *xattr_map = map;
int ret = 0;
const struct XattrMapPattern *pat;
const sqfs_xattr_t *entry;
for (pat = xattr_map->patterns; pat != NULL; pat = pat->next) {
char *patstr = pat->path;
const char *stripped = path;
if (patstr[0] != '/' && stripped[0] == '/') {
stripped++;
}
if (strcmp(patstr, stripped) == 0) {
printf("Applying xattrs for %s", path);
for (entry = pat->entries; entry != NULL; entry = entry->next) {
printf(" %s = \n", entry->key);
fwrite(entry->value, entry->value_len, 1, stdout);
puts("\n");
ret = sqfs_xattr_writer_add(xwr, entry);
if (ret < 0) {
return ret;
}
}
}
}
return ret;
}
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