+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-#pragma once
-
-/***
- This file is part of systemd.
-
- Copyright 2014 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
- ***/
-
-
-#include "macro.h"
-#include "sparse-endian.h"
-#include "hashmap.h"
-#include "in-addr-util.h"
-
-typedef struct DnsPacketHeader DnsPacketHeader;
-typedef struct DnsPacket DnsPacket;
-
-#include "resolved-dns-rr.h"
-#include "resolved-dns-question.h"
-#include "resolved-dns-answer.h"
-#include "resolved-def.h"
-
-typedef enum DnsProtocol {
- DNS_PROTOCOL_DNS,
- DNS_PROTOCOL_MDNS,
- DNS_PROTOCOL_LLMNR,
- _DNS_PROTOCOL_MAX,
- _DNS_PROTOCOL_INVALID = -1
-} DnsProtocol;
-
-struct DnsPacketHeader {
- uint16_t id;
- be16_t flags;
- be16_t qdcount;
- be16_t ancount;
- be16_t nscount;
- be16_t arcount;
-};
-
-#define DNS_PACKET_HEADER_SIZE sizeof(DnsPacketHeader)
-
-/* The various DNS protocols deviate in how large a packet can grow,
- but the TCP transport has a 16bit size field, hence that appears to
- be the absolute maximum. */
-#define DNS_PACKET_SIZE_MAX 0xFFFF
-
-/* RFC 1035 say 512 is the maximum, for classic unicast DNS */
-#define DNS_PACKET_UNICAST_SIZE_MAX 512
-
-#define DNS_PACKET_SIZE_START 512
-
-struct DnsPacket {
- int n_ref;
- DnsProtocol protocol;
- size_t size, allocated, rindex;
- void *_data; /* don't access directly, use DNS_PACKET_DATA()! */
- Hashmap *names; /* For name compression */
-
- /* Parsed data */
- DnsQuestion *question;
- DnsAnswer *answer;
-
- /* Packet reception meta data */
- int ifindex;
- int family, ipproto;
- union in_addr_union sender, destination;
- uint16_t sender_port, destination_port;
- uint32_t ttl;
-
- bool extracted;
-};
-
-static inline uint8_t* DNS_PACKET_DATA(DnsPacket *p) {
- if (_unlikely_(!p))
- return NULL;
-
- if (p->_data)
- return p->_data;
-
- return ((uint8_t*) p) + ALIGN(sizeof(DnsPacket));
-}
-
-#define DNS_PACKET_HEADER(p) ((DnsPacketHeader*) DNS_PACKET_DATA(p))
-#define DNS_PACKET_ID(p) DNS_PACKET_HEADER(p)->id
-#define DNS_PACKET_QR(p) ((be16toh(DNS_PACKET_HEADER(p)->flags) >> 15) & 1)
-#define DNS_PACKET_OPCODE(p) ((be16toh(DNS_PACKET_HEADER(p)->flags) >> 11) & 15)
-#define DNS_PACKET_RCODE(p) (be16toh(DNS_PACKET_HEADER(p)->flags) & 15)
-#define DNS_PACKET_TC(p) ((be16toh(DNS_PACKET_HEADER(p)->flags) >> 9) & 1)
-#define DNS_PACKET_C(p) ((be16toh(DNS_PACKET_HEADER(p)->flags) >> 10) & 1)
-#define DNS_PACKET_T(p) ((be16toh(DNS_PACKET_HEADER(p)->flags) >> 8) & 1)
-#define DNS_PACKET_QDCOUNT(p) be16toh(DNS_PACKET_HEADER(p)->qdcount)
-#define DNS_PACKET_ANCOUNT(p) be16toh(DNS_PACKET_HEADER(p)->ancount)
-#define DNS_PACKET_NSCOUNT(p) be16toh(DNS_PACKET_HEADER(p)->nscount)
-#define DNS_PACKET_ARCOUNT(p) be16toh(DNS_PACKET_HEADER(p)->arcount)
-
-#define DNS_PACKET_MAKE_FLAGS(qr, opcode, aa, tc, rd, ra, ad, cd, rcode) \
- (((uint16_t) !!qr << 15) | \
- ((uint16_t) (opcode & 15) << 11) | \
- ((uint16_t) !!aa << 10) | \
- ((uint16_t) !!tc << 9) | \
- ((uint16_t) !!rd << 8) | \
- ((uint16_t) !!ra << 7) | \
- ((uint16_t) !!ad << 5) | \
- ((uint16_t) !!cd << 4) | \
- ((uint16_t) (rcode & 15)))
-
-static inline unsigned DNS_PACKET_RRCOUNT(DnsPacket *p) {
- return
- (unsigned) DNS_PACKET_ANCOUNT(p) +
- (unsigned) DNS_PACKET_NSCOUNT(p) +
- (unsigned) DNS_PACKET_ARCOUNT(p);
-}
-
-int dns_packet_new(DnsPacket **p, DnsProtocol protocol, size_t mtu);
-int dns_packet_new_query(DnsPacket **p, DnsProtocol protocol, size_t mtu);
-
-DnsPacket *dns_packet_ref(DnsPacket *p);
-DnsPacket *dns_packet_unref(DnsPacket *p);
-
-DEFINE_TRIVIAL_CLEANUP_FUNC(DnsPacket*, dns_packet_unref);
-
-int dns_packet_validate(DnsPacket *p);
-int dns_packet_validate_reply(DnsPacket *p);
-int dns_packet_validate_query(DnsPacket *p);
-
-int dns_packet_append_blob(DnsPacket *p, const void *d, size_t sz, size_t *start);
-int dns_packet_append_uint8(DnsPacket *p, uint8_t v, size_t *start);
-int dns_packet_append_uint16(DnsPacket *p, uint16_t v, size_t *start);
-int dns_packet_append_uint32(DnsPacket *p, uint32_t v, size_t *start);
-int dns_packet_append_string(DnsPacket *p, const char *s, size_t *start);
-int dns_packet_append_label(DnsPacket *p, const char *s, size_t l, size_t *start);
-int dns_packet_append_name(DnsPacket *p, const char *name,
- bool allow_compression, size_t *start);
-int dns_packet_append_key(DnsPacket *p, const DnsResourceKey *key, size_t *start);
-int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *start);
-
-int dns_packet_read(DnsPacket *p, size_t sz, const void **ret, size_t *start);
-int dns_packet_read_blob(DnsPacket *p, void *d, size_t sz, size_t *start);
-int dns_packet_read_uint8(DnsPacket *p, uint8_t *ret, size_t *start);
-int dns_packet_read_uint16(DnsPacket *p, uint16_t *ret, size_t *start);
-int dns_packet_read_uint32(DnsPacket *p, uint32_t *ret, size_t *start);
-int dns_packet_read_string(DnsPacket *p, char **ret, size_t *start);
-int dns_packet_read_name(DnsPacket *p, char **ret,
- bool allow_compression, size_t *start);
-int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, size_t *start);
-int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start);
-
-void dns_packet_rewind(DnsPacket *p, size_t idx);
-
-int dns_packet_skip_question(DnsPacket *p);
-int dns_packet_extract(DnsPacket *p);
-
-enum {
- DNS_RCODE_SUCCESS = 0,
- DNS_RCODE_FORMERR = 1,
- DNS_RCODE_SERVFAIL = 2,
- DNS_RCODE_NXDOMAIN = 3,
- DNS_RCODE_NOTIMP = 4,
- DNS_RCODE_REFUSED = 5,
- DNS_RCODE_YXDOMAIN = 6,
- DNS_RCODE_YXRRSET = 7,
- DNS_RCODE_NXRRSET = 8,
- DNS_RCODE_NOTAUTH = 9,
- DNS_RCODE_NOTZONE = 10,
- DNS_RCODE_BADVERS = 16,
- DNS_RCODE_BADSIG = 16, /* duplicate value! */
- DNS_RCODE_BADKEY = 17,
- DNS_RCODE_BADTIME = 18,
- DNS_RCODE_BADMODE = 19,
- DNS_RCODE_BADNAME = 20,
- DNS_RCODE_BADALG = 21,
- DNS_RCODE_BADTRUNC = 22,
- _DNS_RCODE_MAX_DEFINED
-};
-
-const char* dns_rcode_to_string(int i) _const_;
-int dns_rcode_from_string(const char *s) _pure_;
-
-const char* dns_protocol_to_string(DnsProtocol p) _const_;
-DnsProtocol dns_protocol_from_string(const char *s) _pure_;
-
-#define LLMNR_MULTICAST_IPV4_ADDRESS ((struct in_addr) { .s_addr = htobe32(224U << 24 | 252U) })
-#define LLMNR_MULTICAST_IPV6_ADDRESS ((struct in6_addr) { .s6_addr = { 0xFF, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x03 } })
-
-#define DNSKEY_FLAG_ZONE_KEY (1u << 8)
-#define DNSKEY_FLAG_SEP (1u << 0)
-
-static inline uint16_t dnskey_to_flags(const DnsResourceRecord *rr) {
- return (rr->dnskey.zone_key_flag * DNSKEY_FLAG_ZONE_KEY |
- rr->dnskey.sep_flag * DNSKEY_FLAG_SEP);
-}
-
-/* http://tools.ietf.org/html/rfc4034#appendix-A.1 */
-enum {
- DNSSEC_ALGORITHM_RSAMD5 = 1,
- DNSSEC_ALGORITHM_DH,
- DNSSEC_ALGORITHM_DSA,
- DNSSEC_ALGORITHM_ECC,
- DNSSEC_ALGORITHM_RSASHA1,
- DNSSEC_ALGORITHM_INDIRECT = 252,
- DNSSEC_ALGORITHM_PRIVATEDNS,
- DNSSEC_ALGORITHM_PRIVATEOID,
- _DNSSEC_ALGORITHM_MAX_DEFINED
-};
-
-const char* dnssec_algorithm_to_string(int i) _const_;
-int dnssec_algorithm_from_string(const char *s) _pure_;
-
-static inline uint64_t SD_RESOLVED_FLAGS_MAKE(DnsProtocol protocol, int family) {
-
- /* Converts a protocol + family into a flags field as used in queries */
-
- if (protocol == DNS_PROTOCOL_DNS)
- return SD_RESOLVED_DNS;
-
- if (protocol == DNS_PROTOCOL_LLMNR)
- return family == AF_INET6 ? SD_RESOLVED_LLMNR_IPV6 : SD_RESOLVED_LLMNR_IPV4;
-
- return 0;
-}
~ianmdlvl / elogind.git / blobdiff