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