1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include "in-addr-util.h"
#include "list.h"
#include "resolve-util.h"
#include "time-util.h"
typedef struct DnsScope DnsScope;
typedef struct DnsServer DnsServer;
typedef struct DnsStream DnsStream;
typedef struct DnsPacket DnsPacket;
typedef struct Link Link;
typedef struct Manager Manager;
#include "resolved-dnstls.h"
typedef enum DnsServerType {
DNS_SERVER_SYSTEM,
DNS_SERVER_FALLBACK,
DNS_SERVER_LINK,
_DNS_SERVER_TYPE_MAX,
_DNS_SERVER_TYPE_INVALID = -EINVAL,
} DnsServerType;
const char* dns_server_type_to_string(DnsServerType i) _const_;
DnsServerType dns_server_type_from_string(const char *s) _pure_;
typedef enum DnsServerFeatureLevel {
DNS_SERVER_FEATURE_LEVEL_TCP,
DNS_SERVER_FEATURE_LEVEL_UDP,
DNS_SERVER_FEATURE_LEVEL_EDNS0,
DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN,
DNS_SERVER_FEATURE_LEVEL_DO,
DNS_SERVER_FEATURE_LEVEL_TLS_DO,
_DNS_SERVER_FEATURE_LEVEL_MAX,
_DNS_SERVER_FEATURE_LEVEL_INVALID = -EINVAL,
} DnsServerFeatureLevel;
#define DNS_SERVER_FEATURE_LEVEL_WORST 0
#define DNS_SERVER_FEATURE_LEVEL_BEST (_DNS_SERVER_FEATURE_LEVEL_MAX - 1)
#define DNS_SERVER_FEATURE_LEVEL_IS_EDNS0(x) ((x) >= DNS_SERVER_FEATURE_LEVEL_EDNS0)
#define DNS_SERVER_FEATURE_LEVEL_IS_TLS(x) IN_SET(x, DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN, DNS_SERVER_FEATURE_LEVEL_TLS_DO)
#define DNS_SERVER_FEATURE_LEVEL_IS_DNSSEC(x) ((x) >= DNS_SERVER_FEATURE_LEVEL_DO)
#define DNS_SERVER_FEATURE_LEVEL_IS_UDP(x) IN_SET(x, DNS_SERVER_FEATURE_LEVEL_UDP, DNS_SERVER_FEATURE_LEVEL_EDNS0, DNS_SERVER_FEATURE_LEVEL_DO)
const char* dns_server_feature_level_to_string(DnsServerFeatureLevel i) _const_;
DnsServerFeatureLevel dns_server_feature_level_from_string(const char *s) _pure_;
struct DnsServer {
Manager *manager;
unsigned n_ref;
DnsServerType type;
Link *link;
int family;
union in_addr_union address;
int ifindex; /* for IPv6 link-local DNS servers */
uint16_t port;
char *server_name;
char *server_string;
char *server_string_full;
/* The long-lived stream towards this server. */
DnsStream *stream;
#if ENABLE_DNS_OVER_TLS
DnsTlsServerData dnstls_data;
#endif
DnsServerFeatureLevel verified_feature_level;
DnsServerFeatureLevel possible_feature_level;
size_t received_udp_fragment_max; /* largest packet or fragment (without IP/UDP header) we saw so far */
unsigned n_failed_udp;
unsigned n_failed_tcp;
unsigned n_failed_tls;
bool packet_truncated:1; /* Set when TC bit was set on reply */
bool packet_bad_opt:1; /* Set when OPT was missing or otherwise bad on reply */
bool packet_rrsig_missing:1; /* Set when RRSIG was missing */
bool packet_invalid:1; /* Set when we failed to parse a reply */
bool packet_do_off:1; /* Set when the server didn't copy DNSSEC DO flag from request to response */
bool packet_fragmented:1; /* Set when we ever saw a fragmented packet */
usec_t verified_usec;
usec_t features_grace_period_usec;
/* Whether we already warned about downgrading to non-DNSSEC mode for this server */
bool warned_downgrade:1;
/* Used when GC'ing old DNS servers when configuration changes. */
bool marked:1;
/* If linked is set, then this server appears in the servers linked list */
bool linked:1;
LIST_FIELDS(DnsServer, servers);
};
int dns_server_new(
Manager *m,
DnsServer **ret,
DnsServerType type,
Link *link,
int family,
const union in_addr_union *address,
uint16_t port,
int ifindex,
const char *server_string);
DnsServer* dns_server_ref(DnsServer *s);
DnsServer* dns_server_unref(DnsServer *s);
void dns_server_unlink(DnsServer *s);
void dns_server_move_back_and_unmark(DnsServer *s);
void dns_server_packet_received(DnsServer *s, int protocol, DnsServerFeatureLevel level, size_t fragsize);
void dns_server_packet_lost(DnsServer *s, int protocol, DnsServerFeatureLevel level);
void dns_server_packet_truncated(DnsServer *s, DnsServerFeatureLevel level);
void dns_server_packet_rrsig_missing(DnsServer *s, DnsServerFeatureLevel level);
void dns_server_packet_bad_opt(DnsServer *s, DnsServerFeatureLevel level);
void dns_server_packet_rcode_downgrade(DnsServer *s, DnsServerFeatureLevel level);
void dns_server_packet_invalid(DnsServer *s, DnsServerFeatureLevel level);
void dns_server_packet_do_off(DnsServer *s, DnsServerFeatureLevel level);
void dns_server_packet_udp_fragmented(DnsServer *s, size_t fragsize);
DnsServerFeatureLevel dns_server_possible_feature_level(DnsServer *s);
int dns_server_adjust_opt(DnsServer *server, DnsPacket *packet, DnsServerFeatureLevel level);
const char *dns_server_string(DnsServer *server);
const char *dns_server_string_full(DnsServer *server);
int dns_server_ifindex(const DnsServer *s);
uint16_t dns_server_port(const DnsServer *s);
bool dns_server_dnssec_supported(DnsServer *server);
void dns_server_warn_downgrade(DnsServer *server);
DnsServer *dns_server_find(DnsServer *first, int family, const union in_addr_union *in_addr, uint16_t port, int ifindex, const char *name);
void dns_server_unlink_all(DnsServer *first);
bool dns_server_unlink_marked(DnsServer *first);
void dns_server_mark_all(DnsServer *first);
DnsServer *manager_get_first_dns_server(Manager *m, DnsServerType t);
DnsServer *manager_set_dns_server(Manager *m, DnsServer *s);
DnsServer *manager_get_dns_server(Manager *m);
void manager_next_dns_server(Manager *m, DnsServer *if_current);
DnssecMode dns_server_get_dnssec_mode(DnsServer *s);
DnsOverTlsMode dns_server_get_dns_over_tls_mode(DnsServer *s);
size_t dns_server_get_mtu(DnsServer *s);
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsServer*, dns_server_unref);
extern const struct hash_ops dns_server_hash_ops;
void dns_server_flush_cache(DnsServer *s);
void dns_server_reset_features(DnsServer *s);
void dns_server_reset_features_all(DnsServer *s);
void dns_server_dump(DnsServer *s, FILE *f);
void dns_server_unref_stream(DnsServer *s);
DnsScope *dns_server_scope(DnsServer *s);
|
