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 35 struct Curl_addrinfo *Curl_doh(struct Curl_easy *data, 36 const char *hostname, 37 int port, 38 int *waitp); 39 40 CURLcode Curl_doh_is_resolved(struct Curl_easy *data, 41 struct Curl_dns_entry **dns); 42 43 int Curl_doh_getsock(struct connectdata *conn, curl_socket_t *socks); 44 45 typedef 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 62 typedef 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 73 struct dohaddr { 74 int type; 75 union { 76 unsigned char v4[4]; /* network byte order */ 77 unsigned char v6[16]; 78 } ip; 79 }; 80 81 struct 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 91 DOHcode 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 */ 96 DOHcode doh_decode(const unsigned char *doh, 97 size_t dohlen, 98 DNStype dnstype, 99 struct dohentry *d); 100 void de_init(struct dohentry *d); 101 void 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