1 #!/usr/bin/awk -f
2 # SPDX-License-Identifier: GPL-2.0
3 #
4 # Copyright © 2020, Microsoft Corporation. All rights reserved.
5 #
6 # Author: Mickaël Salaün <mic@linux.microsoft.com>
7 #
8 # Check that a CONFIG_SYSTEM_BLACKLIST_HASH_LIST file contains a valid array of
9 # hash strings. Such string must start with a prefix ("tbs" or "bin"), then a
10 # colon (":"), and finally an even number of hexadecimal lowercase characters
11 # (up to 128).
12
13 BEGIN {
14 RS = ","
15 }
16 {
17 if (!match($0, "^[ \t\n\r]*\"([^\"]*)\"[ \t\n\r]*$", part1)) {
18 print "Not a string (item " NR "):", $0;
19 exit 1;
20 }
21 if (!match(part1[1], "^(tbs|bin):(.*)$", part2)) {
22 print "Unknown prefix (item " NR "):", part1[1];
23 exit 1;
24 }
25 if (!match(part2[2], "^([0-9a-f]+)$", part3)) {
26 print "Not a lowercase hexadecimal string (item " NR "):", part2[2];
27 exit 1;
28 }
29 if (length(part3[1]) > 128) {
30 print "Hash string too long (item " NR "):", part3[1];
31 exit 1;
32 }
33 if (length(part3[1]) % 2 == 1) {
34 print "Not an even number of hexadecimal characters (item " NR "):", part3[1];
35 exit 1;
36 }
37 }
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