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