summaryrefslogtreecommitdiff
path: root/src/grp-resolve/systemd-resolved/resolved-dns-packet.h
diff options
context:
space:
mode:
Diffstat (limited to 'src/grp-resolve/systemd-resolved/resolved-dns-packet.h')
-rw-r--r--src/grp-resolve/systemd-resolved/resolved-dns-packet.h270
1 files changed, 0 insertions, 270 deletions
diff --git a/src/grp-resolve/systemd-resolved/resolved-dns-packet.h b/src/grp-resolve/systemd-resolved/resolved-dns-packet.h
deleted file mode 100644
index 2e0eba83b6..0000000000
--- a/src/grp-resolve/systemd-resolved/resolved-dns-packet.h
+++ /dev/null
@@ -1,270 +0,0 @@
-#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 <netinet/ip.h>
-#include <netinet/udp.h>
-
-#include "basic/hashmap.h"
-#include "basic/in-addr-util.h"
-#include "basic/macro.h"
-#include "basic/sparse-endian.h"
-
-typedef struct DnsPacket DnsPacket;
-typedef struct DnsPacketHeader DnsPacketHeader;
-
-#include "resolved-def.h"
-#include "resolved-dns-answer.h"
-#include "resolved-dns-question.h"
-#include "resolved-dns-rr.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)
-#define UDP_PACKET_HEADER_SIZE (sizeof(struct iphdr) + sizeof(struct udphdr))
-
-/* 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
-
-/* With EDNS0 we can use larger packets, default to 4096, which is what is commonly used */
-#define DNS_PACKET_UNICAST_SIZE_LARGE_MAX 4096
-
-#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 */
- size_t opt_start, opt_size;
-
- /* Parsed data */
- DnsQuestion *question;
- DnsAnswer *answer;
- DnsResourceRecord *opt;
-
- /* Packet reception metadata */
- int ifindex;
- int family, ipproto;
- union in_addr_union sender, destination;
- uint16_t sender_port, destination_port;
- uint32_t ttl;
-
- /* For support of truncated packets */
- DnsPacket *more;
-
- bool on_stack:1;
- bool extracted:1;
- bool refuse_compression:1;
- bool canonical_form:1;
-};
-
-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_AA(p) ((be16toh(DNS_PACKET_HEADER(p)->flags) >> 10) & 1)
-#define DNS_PACKET_TC(p) ((be16toh(DNS_PACKET_HEADER(p)->flags) >> 9) & 1)
-#define DNS_PACKET_RD(p) ((be16toh(DNS_PACKET_HEADER(p)->flags) >> 8) & 1)
-#define DNS_PACKET_RA(p) ((be16toh(DNS_PACKET_HEADER(p)->flags) >> 7) & 1)
-#define DNS_PACKET_AD(p) ((be16toh(DNS_PACKET_HEADER(p)->flags) >> 5) & 1)
-#define DNS_PACKET_CD(p) ((be16toh(DNS_PACKET_HEADER(p)->flags) >> 4) & 1)
-
-static inline uint16_t DNS_PACKET_RCODE(DnsPacket *p) {
- uint16_t rcode;
-
- if (p->opt)
- rcode = (uint16_t) (p->opt->ttl >> 24);
- else
- rcode = 0;
-
- return rcode | (be16toh(DNS_PACKET_HEADER(p)->flags) & 15);
-}
-
-/* LLMNR defines some bits differently */
-#define DNS_PACKET_LLMNR_C(p) DNS_PACKET_AA(p)
-#define DNS_PACKET_LLMNR_T(p) DNS_PACKET_RD(p)
-
-#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) | /* on LLMNR: c */ \
- ((uint16_t) !!(tc) << 9) | \
- ((uint16_t) !!(rd) << 8) | /* on LLMNR: t */ \
- ((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, bool dnssec_checking_disabled);
-
-void dns_packet_set_flags(DnsPacket *p, bool dnssec_checking_disabled, bool truncated);
-
-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_is_reply_for(DnsPacket *p, const DnsResourceKey *key);
-
-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_raw_string(DnsPacket *p, const void *s, size_t size, size_t *start);
-int dns_packet_append_label(DnsPacket *p, const char *s, size_t l, bool canonical_candidate, size_t *start);
-int dns_packet_append_name(DnsPacket *p, const char *name, bool allow_compression, bool canonical_candidate, 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, size_t *rdata_start);
-int dns_packet_append_opt(DnsPacket *p, uint16_t max_udp_size, bool edns0_do, size_t *start);
-
-void dns_packet_truncate(DnsPacket *p, size_t sz);
-int dns_packet_truncate_opt(DnsPacket *p);
-
-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_raw_string(DnsPacket *p, const void **ret, size_t *size, 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, bool *ret_cache_flush, size_t *start);
-int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, bool *ret_cache_flush, 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);
-
-static inline bool DNS_PACKET_SHALL_CACHE(DnsPacket *p) {
- /* Never cache data originating from localhost, under the
- * assumption, that it's coming from a locally DNS forwarder
- * or server, that is caching on its own. */
-
- return in_addr_is_localhost(p->family, &p->sender) == 0;
-}
-
-/* https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-6 */
-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 MDNS_MULTICAST_IPV4_ADDRESS ((struct in_addr) { .s_addr = htobe32(224U << 24 | 251U) })
-#define MDNS_MULTICAST_IPV6_ADDRESS ((struct in6_addr) { .s6_addr = { 0xFF, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfb } })
-
-static inline uint64_t SD_RESOLVED_FLAGS_MAKE(DnsProtocol protocol, int family, bool authenticated) {
- uint64_t f;
-
- /* Converts a protocol + family into a flags field as used in queries and responses */
-
- f = authenticated ? SD_RESOLVED_AUTHENTICATED : 0;
-
- switch (protocol) {
- case DNS_PROTOCOL_DNS:
- return f|SD_RESOLVED_DNS;
-
- case DNS_PROTOCOL_LLMNR:
- return f|(family == AF_INET6 ? SD_RESOLVED_LLMNR_IPV6 : SD_RESOLVED_LLMNR_IPV4);
-
- case DNS_PROTOCOL_MDNS:
- return f|(family == AF_INET6 ? SD_RESOLVED_MDNS_IPV6 : SD_RESOLVED_MDNS_IPV4);
-
- default:
- return f;
- }
-}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2025-04-21 19:27:07 +0000