1 #ifndef HEADER_CURL_DOH_H 2 #define HEADER_CURL_DOH_H 3 /*************************************************************************** 4 * _ _ ____ _ 5 * Project ___| | | | _ \| | 6 * / __| | | | |_) | | 7 * | (__| |_| | _ <| |___ 8 * \___|\___/|_| \_\_____| 9 * 10 * Copyright (C) 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 * SPDX-License-Identifier: curl 24 * 25 ***************************************************************************/ 26 27 #include "urldata.h" 28 #include "curl_addrinfo.h" 29 30 #ifndef CURL_DISABLE_DOH 31 32 typedef enum { 33 DOH_OK, 34 DOH_DNS_BAD_LABEL, /* 1 */ 35 DOH_DNS_OUT_OF_RANGE, /* 2 */ 36 DOH_DNS_LABEL_LOOP, /* 3 */ 37 DOH_TOO_SMALL_BUFFER, /* 4 */ 38 DOH_OUT_OF_MEM, /* 5 */ 39 DOH_DNS_RDATA_LEN, /* 6 */ 40 DOH_DNS_MALFORMAT, /* 7 */ 41 DOH_DNS_BAD_RCODE, /* 8 - no such name */ 42 DOH_DNS_UNEXPECTED_TYPE, /* 9 */ 43 DOH_DNS_UNEXPECTED_CLASS, /* 10 */ 44 DOH_NO_CONTENT, /* 11 */ 45 DOH_DNS_BAD_ID, /* 12 */ 46 DOH_DNS_NAME_TOO_LONG /* 13 */ 47 } DOHcode; 48 49 typedef enum { 50 DNS_TYPE_A = 1, 51 DNS_TYPE_NS = 2, 52 DNS_TYPE_CNAME = 5, 53 DNS_TYPE_AAAA = 28, 54 DNS_TYPE_DNAME = 39 /* RFC6672 */ 55 } DNStype; 56 57 /* one of these for each DoH request */ 58 struct dnsprobe { 59 CURL *easy; 60 DNStype dnstype; 61 unsigned char dohbuffer[512]; 62 size_t dohlen; 63 struct dynbuf serverdoh; 64 }; 65 66 struct dohdata { 67 struct curl_slist *headers; 68 struct dnsprobe probe[DOH_PROBE_SLOTS]; 69 unsigned int pending; /* still outstanding requests */ 70 int port; 71 const char *host; 72 }; 73 74 /* 75 * Curl_doh() resolve a name using DoH (DNS-over-HTTPS). It resolves a name 76 * and returns a 'Curl_addrinfo *' with the address information. 77 */ 78 79 struct Curl_addrinfo *Curl_doh(struct Curl_easy *data, 80 const char *hostname, 81 int port, 82 int *waitp); 83 84 CURLcode Curl_doh_is_resolved(struct Curl_easy *data, 85 struct Curl_dns_entry **dns); 86 87 int Curl_doh_getsock(struct connectdata *conn, curl_socket_t *socks); 88 89 #define DOH_MAX_ADDR 24 90 #define DOH_MAX_CNAME 4 91 92 struct dohaddr { 93 int type; 94 union { 95 unsigned char v4[4]; /* network byte order */ 96 unsigned char v6[16]; 97 } ip; 98 }; 99 100 struct dohentry { 101 struct dynbuf cname[DOH_MAX_CNAME]; 102 struct dohaddr addr[DOH_MAX_ADDR]; 103 int numaddr; 104 unsigned int ttl; 105 int numcname; 106 }; 107 108 109 #ifdef DEBUGBUILD 110 DOHcode doh_encode(const char *host, 111 DNStype dnstype, 112 unsigned char *dnsp, /* buffer */ 113 size_t len, /* buffer size */ 114 size_t *olen); /* output length */ 115 DOHcode doh_decode(const unsigned char *doh, 116 size_t dohlen, 117 DNStype dnstype, 118 struct dohentry *d); 119 void de_init(struct dohentry *d); 120 void de_cleanup(struct dohentry *d); 121 #endif 122 123 #else /* if DoH is disabled */ 124 #define Curl_doh(a,b,c,d) NULL 125 #define Curl_doh_is_resolved(x,y) CURLE_COULDNT_RESOLVE_HOST 126 #endif 127 128 #endif /* HEADER_CURL_DOH_H */ 129