mirror of
https://github.com/morgan9e/systemd
synced 2026-04-14 08:25:20 +09:00
87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include "device-nodes.h"
|
|
#include "path-util.h"
|
|
#include "string-util.h"
|
|
#include "utf8.h"
|
|
|
|
int allow_listed_char_for_devnode(char c, const char *additional) {
|
|
return
|
|
ascii_isdigit(c) ||
|
|
ascii_isalpha(c) ||
|
|
strchr("#+-.:=@_", c) ||
|
|
(additional && strchr(additional, c));
|
|
}
|
|
|
|
int encode_devnode_name(const char *str, char *str_enc, size_t len) {
|
|
size_t i, j;
|
|
|
|
if (!str || !str_enc)
|
|
return -EINVAL;
|
|
|
|
for (i = 0, j = 0; str[i] != '\0'; i++) {
|
|
int seqlen;
|
|
|
|
seqlen = utf8_encoded_valid_unichar(str + i, SIZE_MAX);
|
|
if (seqlen > 1) {
|
|
|
|
if (len-j < (size_t) seqlen)
|
|
return -EINVAL;
|
|
|
|
memcpy(&str_enc[j], &str[i], seqlen);
|
|
j += seqlen;
|
|
i += (seqlen-1);
|
|
|
|
} else if (str[i] == '\\' || !allow_listed_char_for_devnode(str[i], NULL)) {
|
|
|
|
if (len-j < 4)
|
|
return -EINVAL;
|
|
|
|
sprintf(&str_enc[j], "\\x%02x", (unsigned char) str[i]);
|
|
j += 4;
|
|
|
|
} else {
|
|
if (len-j < 1)
|
|
return -EINVAL;
|
|
|
|
str_enc[j] = str[i];
|
|
j++;
|
|
}
|
|
}
|
|
|
|
if (len-j < 1)
|
|
return -EINVAL;
|
|
|
|
str_enc[j] = '\0';
|
|
return 0;
|
|
}
|
|
|
|
int devnode_same(const char *a, const char *b) {
|
|
struct stat sa, sb;
|
|
|
|
assert(a);
|
|
assert(b);
|
|
|
|
if (!valid_device_node_path(a) || !valid_device_node_path(b))
|
|
return -EINVAL;
|
|
|
|
if (stat(a, &sa) < 0)
|
|
return -errno;
|
|
if (stat(b, &sb) < 0)
|
|
return -errno;
|
|
|
|
if (!S_ISBLK(sa.st_mode) && !S_ISCHR(sa.st_mode))
|
|
return -ENODEV;
|
|
if (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode))
|
|
return -ENODEV;
|
|
|
|
if (((sa.st_mode ^ sb.st_mode) & S_IFMT) != 0) /* both inode same device node type? */
|
|
return false;
|
|
|
|
return sa.st_rdev == sb.st_rdev;
|
|
}
|