1#ifndef HEADER_CURL_DOH_H
2#define HEADER_CURL_DOH_H
3/***************************************************************************
4 * _ _ ____ _
5 * Project ___| | | | _ \| |
6 * / __| | | | |_) | |
7 * | (__| |_| | _ <| |___
8 * \___|\___/|_| \_\_____|
9 *
10 * Copyright (C) 2018 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
11 *
12 * This software is licensed as described in the file COPYING, which
13 * you should have received as part of this distribution. The terms
14 * are also available at https://curl.se/docs/copyright.html.
15 *
16 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
17 * copies of the Software, and permit persons to whom the Software is
18 * furnished to do so, under the terms of the COPYING file.
19 *
20 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
21 * KIND, either express or implied.
22 *
23 ***************************************************************************/
24
25#include "urldata.h"
26#include "curl_addrinfo.h"
27
28#ifndef CURL_DISABLE_DOH
29
30/*
31 * Curl_doh() resolve a name using DoH (DNS-over-HTTPS). It resolves a name
32 * and returns a 'Curl_addrinfo *' with the address information.
33 */
34
35struct Curl_addrinfo *Curl_doh(struct Curl_easy *data,
36 const char *hostname,
37 int port,
38 int *waitp);
39
40CURLcode Curl_doh_is_resolved(struct Curl_easy *data,
41 struct Curl_dns_entry **dns);
42
43int Curl_doh_getsock(struct connectdata *conn, curl_socket_t *socks);
44
45typedef enum {
46 DOH_OK,
47 DOH_DNS_BAD_LABEL, /* 1 */
48 DOH_DNS_OUT_OF_RANGE, /* 2 */
49 DOH_DNS_LABEL_LOOP, /* 3 */
50 DOH_TOO_SMALL_BUFFER, /* 4 */
51 DOH_OUT_OF_MEM, /* 5 */
52 DOH_DNS_RDATA_LEN, /* 6 */
53 DOH_DNS_MALFORMAT, /* 7 */
54 DOH_DNS_BAD_RCODE, /* 8 - no such name */
55 DOH_DNS_UNEXPECTED_TYPE, /* 9 */
56 DOH_DNS_UNEXPECTED_CLASS, /* 10 */
57 DOH_NO_CONTENT, /* 11 */
58 DOH_DNS_BAD_ID, /* 12 */
59 DOH_DNS_NAME_TOO_LONG /* 13 */
60} DOHcode;
61
62typedef enum {
63 DNS_TYPE_A = 1,
64 DNS_TYPE_NS = 2,
65 DNS_TYPE_CNAME = 5,
66 DNS_TYPE_AAAA = 28,
67 DNS_TYPE_DNAME = 39 /* RFC6672 */
68} DNStype;
69
70#define DOH_MAX_ADDR 24
71#define DOH_MAX_CNAME 4
72
73struct dohaddr {
74 int type;
75 union {
76 unsigned char v4[4]; /* network byte order */
77 unsigned char v6[16];
78 } ip;
79};
80
81struct dohentry {
82 struct dynbuf cname[DOH_MAX_CNAME];
83 struct dohaddr addr[DOH_MAX_ADDR];
84 int numaddr;
85 unsigned int ttl;
86 int numcname;
87};
88
89
90#ifdef DEBUGBUILD
91DOHcode doh_encode(const char *host,
92 DNStype dnstype,
93 unsigned char *dnsp, /* buffer */
94 size_t len, /* buffer size */
95 size_t *olen); /* output length */
96DOHcode doh_decode(const unsigned char *doh,
97 size_t dohlen,
98 DNStype dnstype,
99 struct dohentry *d);
100void de_init(struct dohentry *d);
101void de_cleanup(struct dohentry *d);
102#endif
103
104#else /* if DoH is disabled */
105#define Curl_doh(a,b,c,d) NULL
106#define Curl_doh_is_resolved(x,y) CURLE_COULDNT_RESOLVE_HOST
107#endif
108
109#endif /* HEADER_CURL_DOH_H */
110