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#ifndef HEADER_CURL_DOH_H
#define HEADER_CURL_DOH_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2018 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "urldata.h"
#include "curl_addrinfo.h"
#ifndef CURL_DISABLE_DOH
typedef enum {
DOH_OK,
DOH_DNS_BAD_LABEL, /* 1 */
DOH_DNS_OUT_OF_RANGE, /* 2 */
DOH_DNS_LABEL_LOOP, /* 3 */
DOH_TOO_SMALL_BUFFER, /* 4 */
DOH_OUT_OF_MEM, /* 5 */
DOH_DNS_RDATA_LEN, /* 6 */
DOH_DNS_MALFORMAT, /* 7 */
DOH_DNS_BAD_RCODE, /* 8 - no such name */
DOH_DNS_UNEXPECTED_TYPE, /* 9 */
DOH_DNS_UNEXPECTED_CLASS, /* 10 */
DOH_NO_CONTENT, /* 11 */
DOH_DNS_BAD_ID, /* 12 */
DOH_DNS_NAME_TOO_LONG /* 13 */
} DOHcode;
typedef enum {
DNS_TYPE_A = 1,
DNS_TYPE_NS = 2,
DNS_TYPE_CNAME = 5,
DNS_TYPE_AAAA = 28,
DNS_TYPE_DNAME = 39 /* RFC6672 */
} DNStype;
/* one of these for each DoH request */
struct dnsprobe {
CURL *easy;
DNStype dnstype;
unsigned char dohbuffer[512];
size_t dohlen;
struct dynbuf serverdoh;
};
struct dohdata {
struct curl_slist *headers;
struct dnsprobe probe[DOH_PROBE_SLOTS];
unsigned int pending; /* still outstanding requests */
int port;
const char *host;
};
/*
* Curl_doh() resolve a name using DoH (DNS-over-HTTPS). It resolves a name
* and returns a 'Curl_addrinfo *' with the address information.
*/
struct Curl_addrinfo *Curl_doh(struct Curl_easy *data,
const char *hostname,
int port,
int *waitp);
CURLcode Curl_doh_is_resolved(struct Curl_easy *data,
struct Curl_dns_entry **dns);
int Curl_doh_getsock(struct connectdata *conn, curl_socket_t *socks);
#define DOH_MAX_ADDR 24
#define DOH_MAX_CNAME 4
struct dohaddr {
int type;
union {
unsigned char v4[4]; /* network byte order */
unsigned char v6[16];
} ip;
};
struct dohentry {
struct dynbuf cname[DOH_MAX_CNAME];
struct dohaddr addr[DOH_MAX_ADDR];
int numaddr;
unsigned int ttl;
int numcname;
};
#ifdef DEBUGBUILD
DOHcode doh_encode(const char *host,
DNStype dnstype,
unsigned char *dnsp, /* buffer */
size_t len, /* buffer size */
size_t *olen); /* output length */
DOHcode doh_decode(const unsigned char *doh,
size_t dohlen,
DNStype dnstype,
struct dohentry *d);
void de_init(struct dohentry *d);
void de_cleanup(struct dohentry *d);
#endif
#else /* if DoH is disabled */
#define Curl_doh(a,b,c,d) NULL
#define Curl_doh_is_resolved(x,y) CURLE_COULDNT_RESOLVE_HOST
#endif
#endif /* HEADER_CURL_DOH_H */
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