531 lines
14 KiB
C
531 lines
14 KiB
C
/*
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* $Id$
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*
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Copyright (c) 2016-2020 Chung, Hyung-Hwan. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAfRRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _MIO_DNS_H_
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#define _MIO_DNS_H_
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#include <mio.h>
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#include <mio-skad.h>
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#define MIO_DNS_PORT (53)
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enum mio_dns_opcode_t
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{
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MIO_DNS_OPCODE_QUERY = 0, /* standard query */
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MIO_DNS_OPCODE_IQUERY = 1, /* inverse query */
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MIO_DNS_OPCODE_STATUS = 2, /* status request */
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/* 3 unassigned */
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MIO_DNS_OPCODE_NOTIFY = 4,
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MIO_DNS_OPCODE_UPDATE = 5
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};
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typedef enum mio_dns_opcode_t mio_dns_opcode_t;
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enum mio_dns_rcode_t
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{
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MIO_DNS_RCODE_NOERROR = 0,
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MIO_DNS_RCODE_FORMERR = 1, /* format error */
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MIO_DNS_RCODE_SERVFAIL = 2, /* server failure */
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MIO_DNS_RCODE_NXDOMAIN = 3, /* non-existent domain */
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MIO_DNS_RCODE_NOTIMPL = 4, /* not implemented */
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MIO_DNS_RCODE_REFUSED = 5, /* query refused */
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MIO_DNS_RCODE_YXDOMAIN = 6, /* name exists when it should not */
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MIO_DNS_RCODE_YXRRSET = 7, /* RR set exists when it should not */
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MIO_DNS_RCODE_NXRRSET = 8, /* RR set exists when it should not */
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MIO_DNS_RCODE_NOTAUTH = 9, /* not authorized or server not authoritative for zone*/
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MIO_DNS_RCODE_NOTZONE = 10, /* name not contained in zone */
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/* the standard rcode field is 4 bit long. so the max is 15. */
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/* items belows require EDNS0 */
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MIO_DNS_RCODE_BADVERS = 16,
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MIO_DNS_RCODE_BADSIG = 17,
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MIO_DNS_RCODE_BADTIME = 18,
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MIO_DNS_RCODE_BADMODE = 19,
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MIO_DNS_RCODE_BADNAME = 20,
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MIO_DNS_RCODE_BADALG = 21,
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MIO_DNS_RCODE_BADTRUNC = 22,
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MIO_DNS_RCODE_BADCOOKIE = 23
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};
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typedef enum mio_dns_rcode_t mio_dns_rcode_t;
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enum mio_dns_rrt_t
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{
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/*
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* [RFC1035]
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* TYPE fields are used in resource records. Note that these types are a
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* subset of QTYPEs.
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*/
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MIO_DNS_RRT_A = 1,
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MIO_DNS_RRT_NS = 2,
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MIO_DNS_RRT_MD = 3, /* mail destination. RFC973 replaced this with MX*/
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MIO_DNS_RRT_MF = 4, /* mail forwarder. RFC973 replaced this with MX */
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MIO_DNS_RRT_CNAME = 5,
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MIO_DNS_RRT_SOA = 6,
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MIO_DNS_RRT_MB = 7, /* kind of obsoleted. RFC1035, RFC2505 */
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MIO_DNS_RRT_MG = 8, /* kind of obsoleted. RFC1035, RFC2505 */
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MIO_DNS_RRT_MR = 9, /* kind of obsoleted. RFC1035, RFC2505 */
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MIO_DNS_RRT_NULL = 10,
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MIO_DNS_RRT_PTR = 12,
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MIO_DNS_RRT_MINFO = 15, /* kind of obsoleted. RFC1035, RFC2505 */
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MIO_DNS_RRT_MX = 15,
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MIO_DNS_RRT_TXT = 16,
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MIO_DNS_RRT_AAAA = 28,
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MIO_DNS_RRT_EID = 31,
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MIO_DNS_RRT_SRV = 33,
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MIO_DNS_RRT_OPT = 41,
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MIO_DNS_RRT_RRSIG = 46,
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/*
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* [RFC1035]
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* QTYPE fields appear in the question part of a query. QTYPES are a
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* superset of TYPEs, hence all TYPEs are valid QTYPEs. In addition, the
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* following QTYPEs are defined:
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*/
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MIO_DNS_RRT_Q_AFXR = 252, /* A request for a transfer of an entire zone */
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MIO_DNS_RRT_Q_MAILB = 253, /* A request for mailbox-related records (MB, MG or MR) */
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MIO_DNS_RRT_Q_MAILA = 254, /* A request for mail agent RRs (Obsolete - see MX) */
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MIO_DNS_RRT_Q_ANY = 255 /* A request for all records */
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};
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typedef enum mio_dns_rrt_t mio_dns_rrt_t;
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/*
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* CLASS fields appear in resource records. The following CLASS mnemonics
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* and values are defined:
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*/
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enum mio_dns_rrc_t
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{
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MIO_DNS_RRC_IN = 1, /* internet */
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MIO_DNS_RRC_CH = 3, /* chaos */
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MIO_DNS_RRC_HS = 4, /* Hesiod [Dyer 87] */
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MIO_DNS_RRC_NONE = 254,
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/*
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*
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* QCLASS fields appear in the question section of a query. QCLASS values
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* are a superset of CLASS values; every CLASS is a valid QCLASS. In
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* addition to CLASS values, the following QCLASSes are defined:
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*/
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MIO_DNS_RRC_Q_ANY = 255
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};
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typedef enum mio_dns_rrc_t mio_dns_rrc_t;
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enum mio_dns_eopt_code_t
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{
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MIO_DNS_EOPT_NSID = 3,
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MIO_DNS_EOPT_DAU = 5,
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MIO_DNS_EOPT_DHU = 6,
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MIO_DNS_EOPT_N3U = 7,
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MIO_DNS_EOPT_ECS = 8,
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MIO_DNS_EOPT_EXPIRE = 9,
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MIO_DNS_EOPT_COOKIE = 10,
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MIO_DNS_EOPT_TCPKEEPALIVE = 11,
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MIO_DNS_EOPT_PADDING = 12,
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MIO_DNS_EOPT_CHAIN = 13,
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MIO_DNS_EOPT_KEYTAG = 14,
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};
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typedef enum mio_dns_eopt_code_t mio_dns_eopt_code_t;
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/* dns message preamble */
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typedef struct mio_dns_msg_t mio_dns_msg_t;
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struct mio_dns_msg_t
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{
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mio_oow_t msglen;
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mio_oow_t pktlen;
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mio_oow_t pktalilen;
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};
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#include <mio-pac1.h>
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struct mio_dns_pkt_t /* dns packet header */
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{
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mio_uint16_t id;
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#if defined(MIO_ENDIAN_BIG)
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mio_uint16_t qr: 1; /* query(0), answer(1) */
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mio_uint16_t opcode: 4; /* operation type */
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mio_uint16_t aa: 1; /* authoritative answer */
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mio_uint16_t tc: 1; /* truncated. response too large for UDP */
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mio_uint16_t rd: 1; /* recursion desired */
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mio_uint16_t ra: 1; /* recursion available */
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mio_uint16_t unused_1: 1;
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mio_uint16_t ad: 1; /* authentication data - dnssec */
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mio_uint16_t cd: 1; /* checking disabled - dnssec */
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mio_uint16_t rcode: 4; /* reply code - for reply only */
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#else
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mio_uint16_t rd: 1;
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mio_uint16_t tc: 1;
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mio_uint16_t aa: 1;
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mio_uint16_t opcode: 4;
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mio_uint16_t qr: 1;
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mio_uint16_t rcode: 4;
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mio_uint16_t cd: 1;
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mio_uint16_t ad: 1;
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mio_uint16_t unused_1: 1;
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mio_uint16_t ra: 1;
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#endif
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mio_uint16_t qdcount; /* number of questions */
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mio_uint16_t ancount; /* number of answers (answer part) */
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mio_uint16_t nscount; /* number of name servers (authority part. only NS types) */
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mio_uint16_t arcount; /* number of additional resource (additional part) */
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};
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typedef struct mio_dns_pkt_t mio_dns_pkt_t;
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struct mio_dns_pkt_alt_t
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{
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mio_uint16_t id;
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mio_uint16_t flags;
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mio_uint16_t rrcount[4];
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};
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typedef struct mio_dns_pkt_alt_t mio_dns_pkt_alt_t;
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/* question
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* name, qtype, qclass
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* answer
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* name, qtype, qclass, ttl, rlength, rdata
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*/
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/* trailing part after the domain name in a resource record in a question */
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struct mio_dns_qrtr_t
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{
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/* qname upto 64 bytes */
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mio_uint16_t qtype;
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mio_uint16_t qclass;
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};
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typedef struct mio_dns_qrtr_t mio_dns_qrtr_t;
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/* trailing part after the domain name in a resource record in an answer */
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struct mio_dns_rrtr_t
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{
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/* qname upto 64 bytes */
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mio_uint16_t rrtype;
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mio_uint16_t rrclass;
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mio_uint32_t ttl;
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mio_uint16_t dlen; /* data length */
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/* actual data if if dlen > 0 */
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};
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typedef struct mio_dns_rrtr_t mio_dns_rrtr_t;
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struct mio_dns_eopt_t
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{
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mio_uint16_t code;
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mio_uint16_t dlen;
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/* actual data if if dlen > 0 */
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};
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typedef struct mio_dns_eopt_t mio_dns_eopt_t;
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#include <mio-upac.h>
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/* ---------------------------------------------------------------- */
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/*
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#define MIO_DNS_HDR_MAKE_FLAGS(qr,opcode,aa,tc,rd,ra,ad,cd,rcode) \
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((((qr) & 0x01) << 15) | (((opcode) & 0x0F) << 14) | (((aa) & 0x01) << 10) | (((tc) & 0x01) << 9) | \
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(((rd) & 0x01) << 8) | (((ra) & 0x01) << 7) | (((ad) & 0x01) << 5) | (((cd) & 0x01) << 4) | ((rcode) & 0x0F))
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*/
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/* breakdown of the dns message id and flags. it excludes rr count fields.*/
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struct mio_dns_bhdr_t
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{
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mio_int32_t id;
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mio_uint8_t qr; /* query(0), answer(1) */
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mio_uint8_t opcode; /* operation type */
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mio_uint8_t aa; /* authoritative answer */
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mio_uint8_t tc; /* truncated. response too large for UDP */
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mio_uint8_t rd; /* recursion desired */
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mio_uint8_t ra; /* recursion available */
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mio_uint8_t ad; /* authentication data - dnssec */
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mio_uint8_t cd; /* checking disabled - dnssec */
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mio_uint8_t rcode; /* reply code - for reply only */
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};
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typedef struct mio_dns_bhdr_t mio_dns_bhdr_t;
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/* breakdown of question record */
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struct mio_dns_bqr_t
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{
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mio_bch_t* qname;
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mio_uint16_t qtype;
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mio_uint16_t qclass;
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};
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typedef struct mio_dns_bqr_t mio_dns_bqr_t;
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enum mio_dns_rr_part_t
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{
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MIO_DNS_RR_PART_ANSWER,
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MIO_DNS_RR_PART_AUTHORITY,
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MIO_DNS_RR_PART_ADDITIONAL
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};
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typedef enum mio_dns_rr_part_t mio_dns_rr_part_t;
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/* breakdown of resource record */
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struct mio_dns_brr_t
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{
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mio_dns_rr_part_t part;
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mio_bch_t* rrname;
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mio_uint16_t rrtype;
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mio_uint16_t rrclass;
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mio_uint32_t ttl;
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mio_uint16_t dlen;
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void* dptr;
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};
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typedef struct mio_dns_brr_t mio_dns_brr_t;
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#if 0
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/* A RDATA */
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struct mio_dns_brrd_a_t
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{
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};
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typedef struct mio_dns_brrd_a_t mio_dns_brrd_a_t;
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/* 3.3.1 CNAME RDATA format */
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struct mio_dns_brrd_cname_t
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{
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};
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typedef struct mio_dns_brrd_cname_t mio_dns_brc_cname_t;
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/* 3.3.9 MX RDATA format */
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struct mio_dns_brrd_mx_t
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{
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mio_uint16_t preference;
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mio_bch_t* exchange;
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};
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typedef struct mio_dns_brrd_mx_t mio_dns_brrd_mx_t;
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#endif
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struct mio_dns_brrd_soa_t
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{
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mio_bch_t* mname;
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mio_bch_t* rname;
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mio_uint32_t serial;
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mio_uint32_t refresh;
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mio_uint32_t retry;
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mio_uint32_t expire;
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mio_uint32_t minimum;
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};
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typedef struct mio_dns_brrd_soa_t mio_dns_brrd_soa_t;
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struct mio_dns_beopt_t
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{
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mio_uint16_t code;
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mio_uint16_t dlen;
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void* dptr;
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};
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typedef struct mio_dns_beopt_t mio_dns_beopt_t;
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/* the full rcode must be given. the macro takes the upper 8 bits */
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#define MIO_DNS_EDNS_MAKE_TTL(rcode,version,dnssecok) ((((((mio_uint32_t)rcode) >> 4) & 0xFF) << 24) | (((mio_uint32_t)version & 0xFF) << 16) | (((mio_uint32_t)dnssecok & 0x1) << 15))
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struct mio_dns_bedns_t
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{
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mio_uint16_t uplen; /* udp payload len - will be placed in the qclass field of RR. */
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/* the ttl field(32 bits) of RR holds extended rcode, version, dnssecok */
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mio_uint8_t version;
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mio_uint8_t dnssecok;
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mio_oow_t beonum; /* option count */
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mio_dns_beopt_t* beoptr;
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};
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typedef struct mio_dns_bedns_t mio_dns_bedns_t;
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/* ---------------------------------------------------------------- */
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typedef struct mio_svc_dns_t mio_svc_dns_t; /* server service */
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typedef struct mio_svc_dnc_t mio_svc_dnc_t; /* client service */
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typedef struct mio_svc_dnr_t mio_svc_dnr_t; /* recursor service */
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typedef void (*mio_svc_dnc_on_reply_t) (
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mio_svc_dnc_t* dnc,
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mio_dns_msg_t* reqmsg,
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mio_errnum_t status,
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const void* data,
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mio_oow_t len
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);
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typedef void (*mio_svc_dnc_on_resolve_t) (
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mio_svc_dnc_t* dnc,
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mio_dns_msg_t* reqmsg,
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mio_errnum_t status,
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const void* data,
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mio_oow_t len
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);
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#define mio_svc_dns_getmio(svc) mio_svc_getmio(svc)
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#define mio_svc_dnc_getmio(svc) mio_svc_getmio(svc)
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#define mio_svc_dnr_getmio(svc) mio_svc_getmio(svc)
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enum mio_svc_dnc_resolve_flag_t
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{
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MIO_SVC_DNC_RESOLVE_FLAG_BRIEF = (1 << 0)
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};
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typedef enum mio_svc_dnc_resolve_flag_t mio_svc_dnc_resolve_flag_t;
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/* ---------------------------------------------------------------- */
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struct mio_dns_pkt_info_t
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{
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/* the following 5 fields are internal use only */
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mio_uint8_t* _start;
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mio_uint8_t* _end;
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mio_uint8_t* _ptr;
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mio_oow_t _rrdlen; /* length needed to store RRs decoded */
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mio_uint8_t* _rrdptr;
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/* you may access the following fields */
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mio_dns_bhdr_t hdr;
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struct
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{
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int exist;
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mio_uint16_t uplen; /* udp payload len - will be placed in the qclass field of RR. */
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mio_uint8_t version;
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mio_uint8_t dnssecok;
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} edns;
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mio_uint16_t qdcount; /* number of questions */
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mio_uint16_t ancount; /* number of answers (answer part) */
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mio_uint16_t nscount; /* number of name servers (authority part. only NS types) */
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mio_uint16_t arcount; /* number of additional resource (additional part) */
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struct
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{
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mio_dns_bqr_t* qd;
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mio_dns_brr_t* an;
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mio_dns_brr_t* ns;
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mio_dns_brr_t* ar;
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} rr;
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};
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typedef struct mio_dns_pkt_info_t mio_dns_pkt_info_t;
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/* ---------------------------------------------------------------- */
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#if defined(__cplusplus)
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extern "C" {
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#endif
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MIO_EXPORT mio_svc_dnc_t* mio_svc_dnc_start (
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mio_t* mio,
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const mio_skad_t* serv_addr, /* required */
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const mio_skad_t* bind_addr, /* optional. can be MIO_NULL */
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const mio_ntime_t* send_tmout, /* required */
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const mio_ntime_t* reply_tmout, /* required */
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mio_oow_t reply_tmout_max_tries
|
|
);
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|
|
|
MIO_EXPORT void mio_svc_dnc_stop (
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|
mio_svc_dnc_t* dnc
|
|
);
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|
|
|
MIO_EXPORT mio_dns_msg_t* mio_svc_dnc_sendmsg (
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|
mio_svc_dnc_t* dnc,
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|
mio_dns_bhdr_t* bdns,
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|
mio_dns_bqr_t* qr,
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|
mio_oow_t qr_count,
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|
mio_dns_brr_t* rr,
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|
mio_oow_t rr_count,
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|
mio_dns_bedns_t* edns,
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|
mio_svc_dnc_on_reply_t on_reply,
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|
mio_oow_t xtnsize
|
|
);
|
|
|
|
MIO_EXPORT mio_dns_msg_t* mio_svc_dnc_sendreq (
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|
mio_svc_dnc_t* dnc,
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|
mio_dns_bhdr_t* bdns,
|
|
mio_dns_bqr_t* qr,
|
|
mio_dns_bedns_t* edns,
|
|
mio_svc_dnc_on_reply_t on_reply,
|
|
mio_oow_t xtnsize
|
|
);
|
|
|
|
|
|
MIO_EXPORT mio_dns_msg_t* mio_svc_dnc_resolve (
|
|
mio_svc_dnc_t* dnc,
|
|
const mio_bch_t* qname,
|
|
mio_dns_rrt_t qtype,
|
|
int flags,
|
|
mio_svc_dnc_on_resolve_t on_resolve,
|
|
mio_oow_t xtnsize
|
|
);
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
|
|
MIO_EXPORT mio_dns_pkt_info_t* mio_dns_make_packet_info (
|
|
mio_t* mio,
|
|
const mio_dns_pkt_t* pkt,
|
|
mio_oow_t len
|
|
);
|
|
|
|
MIO_EXPORT void mio_dns_free_packet_info (
|
|
mio_t* mio,
|
|
mio_dns_pkt_info_t* pi
|
|
);
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
|
|
#if defined(MIO_HAVE_INLINE)
|
|
static MIO_INLINE mio_dns_pkt_t* mio_dns_msg_to_pkt (mio_dns_msg_t* msg) { return (mio_dns_pkt_t*)(msg + 1); }
|
|
#else
|
|
# define mio_dns_msg_to_pkt(msg) ((mio_dns_pkt_t*)((mio_dns_msg_t*)(msg) + 1))
|
|
#endif
|
|
|
|
MIO_EXPORT mio_dns_msg_t* mio_dns_make_msg (
|
|
mio_t* mio,
|
|
mio_dns_bhdr_t* bhdr,
|
|
mio_dns_bqr_t* qr,
|
|
mio_oow_t qr_count,
|
|
mio_dns_brr_t* rr,
|
|
mio_oow_t rr_count,
|
|
mio_dns_bedns_t* edns,
|
|
mio_oow_t xtnsize
|
|
);
|
|
|
|
MIO_EXPORT void mio_dns_free_msg (
|
|
mio_t* mio,
|
|
mio_dns_msg_t* msg
|
|
);
|
|
|
|
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif
|