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    1: #ifndef HEADER_CURL_DOH_H
    2: #define HEADER_CURL_DOH_H
    3: /***************************************************************************
    4:  *                                  _   _ ____  _
    5:  *  Project                     ___| | | |  _ \| |
    6:  *                             / __| | | | |_) | |
    7:  *                            | (__| |_| |  _ <| |___
    8:  *                             \___|\___/|_| \_\_____|
    9:  *
   10:  * Copyright (C) 2018 - 2020, 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.haxx.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: Curl_addrinfo *Curl_doh(struct connectdata *conn,
   36:                         const char *hostname,
   37:                         int port,
   38:                         int *waitp);
   39: 
   40: CURLcode Curl_doh_is_resolved(struct connectdata *conn,
   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 cnamestore {
   74:   size_t len;       /* length of cname */
   75:   char *alloc;      /* allocated pointer */
   76:   size_t allocsize; /* allocated size */
   77: };
   78: 
   79: struct dohaddr {
   80:   int type;
   81:   union {
   82:     unsigned char v4[4]; /* network byte order */
   83:     unsigned char v6[16];
   84:   } ip;
   85: };
   86: 
   87: struct dohentry {
   88:   unsigned int ttl;
   89:   int numaddr;
   90:   struct dohaddr addr[DOH_MAX_ADDR];
   91:   int numcname;
   92:   struct cnamestore cname[DOH_MAX_CNAME];
   93: };
   94: 
   95: 
   96: #ifdef DEBUGBUILD
   97: DOHcode doh_encode(const char *host,
   98:                    DNStype dnstype,
   99:                    unsigned char *dnsp, /* buffer */
  100:                    size_t len,  /* buffer size */
  101:                    size_t *olen); /* output length */
  102: DOHcode doh_decode(const unsigned char *doh,
  103:                    size_t dohlen,
  104:                    DNStype dnstype,
  105:                    struct dohentry *d);
  106: void de_cleanup(struct dohentry *d);
  107: #endif
  108: 
  109: #else /* if DOH is disabled */
  110: #define Curl_doh(a,b,c,d) NULL
  111: #define Curl_doh_is_resolved(x,y) CURLE_COULDNT_RESOLVE_HOST
  112: #endif
  113: 
  114: #endif /* HEADER_CURL_DOH_H */