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
|
/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2022-2023 OpenVPN Inc <sales@openvpn.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef DNS_H
#define DNS_H
#include "buffer.h"
#include "env_set.h"
enum dns_security {
DNS_SECURITY_UNSET,
DNS_SECURITY_NO,
DNS_SECURITY_YES,
DNS_SECURITY_OPTIONAL
};
enum dns_server_transport {
DNS_TRANSPORT_UNSET,
DNS_TRANSPORT_PLAIN,
DNS_TRANSPORT_HTTPS,
DNS_TRANSPORT_TLS
};
struct dns_domain {
struct dns_domain *next;
const char *name;
};
struct dns_server_addr
{
union {
struct in_addr a4;
struct in6_addr a6;
} in;
sa_family_t family;
in_port_t port;
};
struct dns_server {
struct dns_server *next;
long priority;
size_t addr_count;
struct dns_server_addr addr[8];
struct dns_domain *domains;
enum dns_security dnssec;
enum dns_server_transport transport;
const char *sni;
};
struct dns_options {
struct dns_domain *search_domains;
struct dns_server *servers_prepull;
struct dns_server *servers;
struct gc_arena gc;
};
/**
* Parses a string DNS server priority and validates it.
*
* @param priority Pointer to where the priority should be stored
* @param str Priority string to parse
* @param pulled Whether this was pulled from a server
* @return True if priority in string is valid
*/
bool dns_server_priority_parse(long *priority, const char *str, bool pulled);
/**
* Find or create DNS server with priority in a linked list.
* The list is ordered by priority.
*
* @param entry Address of the first list entry pointer
* @param priority Priority of the DNS server to find / create
* @param gc The gc new list items should be allocated in
*/
struct dns_server *dns_server_get(struct dns_server **entry, long priority, struct gc_arena *gc);
/**
* Appends DNS domain parameters to a linked list.
*
* @param entry Address of the first list entry pointer
* @param domains Address of the first domain parameter
* @param gc The gc the new list items should be allocated in
*/
void dns_domain_list_append(struct dns_domain **entry, char **domains, struct gc_arena *gc);
/**
* Parses a string IPv4 or IPv6 address and optional colon separated port,
* into a in_addr or in6_addr respectively plus a in_port_t port.
*
* @param server Pointer to DNS server the address is parsed for
* @param addr Address as string
* @return True if parsing was successful
*/
bool dns_server_addr_parse(struct dns_server *server, const char *addr);
/**
* Checks validity of DNS options
*
* @param msglevel The message level to log errors with
* @param o Pointer to the DNS options to validate
* @return True if no error was found
*/
bool dns_options_verify(int msglevel, const struct dns_options *o);
/**
* Makes a deep copy of the passed DNS options.
*
* @param o Pointer to the DNS options to clone
* @param gc Pointer to the gc_arena to use for the clone
* @return The dns_options clone
*/
struct dns_options clone_dns_options(const struct dns_options o, struct gc_arena *gc);
/**
* Saves and resets the server options, so that pulled ones don't mix in.
*
* @param o Pointer to the DNS options to modify
*/
void dns_options_preprocess_pull(struct dns_options *o);
/**
* Merges pulled DNS servers with static ones into an ordered list.
*
* @param o Pointer to the DNS options to modify
*/
void dns_options_postprocess_pull(struct dns_options *o);
/**
* Puts the DNS options into an environment set.
*
* @param o Pointer to the DNS options to set
* @param es Pointer to the env_set to set the options into
*/
void setenv_dns_options(const struct dns_options *o, struct env_set *es);
/**
* Prints configured DNS options.
*
* @param o Pointer to the DNS options to print
*/
void show_dns_options(const struct dns_options *o);
#endif /* ifndef DNS_H */
|
