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Diffstat (limited to '')
| -rw-r--r-- | src/basic/dns-def.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/basic/dns-def.h b/src/basic/dns-def.h new file mode 100644 index 0000000..d70220b --- /dev/null +++ b/src/basic/dns-def.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +/* Length of a single label, with all escaping removed, excluding any trailing dot or NUL byte */ +#define DNS_LABEL_MAX 63 + +/* Worst case length of a single label, with all escaping applied and room for a trailing NUL byte. */ +#define DNS_LABEL_ESCAPED_MAX (DNS_LABEL_MAX*4+1) + +/* Maximum length of a full hostname, consisting of a series of unescaped labels, and no trailing dot or NUL byte */ +#define DNS_HOSTNAME_MAX 253 + +/* Maximum length of a full hostname, on the wire, including the final NUL byte */ +#define DNS_WIRE_FORMAT_HOSTNAME_MAX 255 + +/* Maximum number of labels per valid hostname */ +#define DNS_N_LABELS_MAX 127 |