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util: move several DNS related definitions to src/basic/dns-def.h

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DNS_HOSTNAME_MAX is used by sd-resolve, but it was defined in
src/shared/dns-domain.h. The library libsystemd should be independent
of source files under src/shared.
This commit is contained in:
Yu Watanabe 2021-01-01 08:52:52 +09:00
parent af182ae1dc
commit c11e5f43d2
4 changed files with 20 additions and 16 deletions
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17
src/basic/dns-def.h Normal file
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@ -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

1
src/basic/meson.build
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@ -42,6 +42,7 @@ basic_sources = files('''
dirent-util.h
dlfcn-util.c
dlfcn-util.h
dns-def.h
efivars.c
efivars.h
env-file.c

2
src/libsystemd/sd-resolve/sd-resolve.c
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@ -15,7 +15,7 @@
#include "sd-resolve.h"
#include "alloc-util.h"
#include "dns-domain.h"
#include "dns-def.h"
#include "errno-util.h"
#include "fd-util.h"
#include "io-util.h"

16
src/shared/dns-domain.h
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@ -6,24 +6,10 @@
#include <stddef.h>
#include <stdint.h>
#include "dns-def.h"
#include "hashmap.h"
#include "in-addr-util.h"
/* 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
typedef enum DNSLabelFlags {
DNS_LABEL_LDH = 1 << 0, /* Follow the "LDH" rule — only letters, digits, and internal hyphens. */
DNS_LABEL_NO_ESCAPES = 1 << 1, /* Do not treat backslashes specially */