mirror of
https://github.com/pi-hole/dnsmasq.git
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191 lines
6.2 KiB
C
191 lines
6.2 KiB
C
/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 dated June, 1991, or
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(at your option) version 3 dated 29 June, 2007.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define NAMESERVER_PORT 53
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#define TFTP_PORT 69
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#define MIN_PORT 1024 /* first non-reserved port */
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#define MAX_PORT 65535u
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#define IN6ADDRSZ 16
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#define INADDRSZ 4
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#define PACKETSZ 512 /* maximum packet size */
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#define MAXDNAME 1025 /* maximum presentation domain name */
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#define RRFIXEDSZ 10 /* #/bytes of fixed data in r record */
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#define MAXLABEL 63 /* maximum length of domain label */
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#define NOERROR 0 /* no error */
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#define FORMERR 1 /* format error */
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#define SERVFAIL 2 /* server failure */
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#define NXDOMAIN 3 /* non existent domain */
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#define NOTIMP 4 /* not implemented */
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#define REFUSED 5 /* query refused */
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#define QUERY 0 /* opcode */
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#define C_IN 1 /* the arpa internet */
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#define C_CHAOS 3 /* for chaos net (MIT) */
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#define C_HESIOD 4 /* hesiod */
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#define C_ANY 255 /* wildcard match */
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#define T_A 1
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#define T_NS 2
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#define T_MD 3
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#define T_MF 4
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#define T_CNAME 5
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#define T_SOA 6
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#define T_MB 7
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#define T_MG 8
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#define T_MR 9
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#define T_PTR 12
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#define T_MINFO 14
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#define T_MX 15
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#define T_TXT 16
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#define T_RP 17
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#define T_AFSDB 18
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#define T_RT 21
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#define T_SIG 24
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#define T_PX 26
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#define T_AAAA 28
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#define T_NXT 30
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#define T_SRV 33
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#define T_NAPTR 35
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#define T_KX 36
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#define T_DNAME 39
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#define T_OPT 41
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#define T_DS 43
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#define T_RRSIG 46
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#define T_NSEC 47
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#define T_DNSKEY 48
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#define T_NSEC3 50
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#define T_TKEY 249
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#define T_TSIG 250
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#define T_AXFR 252
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#define T_MAILB 253
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#define T_ANY 255
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#define T_CAA 257
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#define EDNS0_OPTION_MAC 65001 /* dyndns.org temporary assignment */
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#define EDNS0_OPTION_CLIENT_SUBNET 8 /* IANA */
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#define EDNS0_OPTION_EDE 15 /* IANA - RFC 8914 */
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#define EDNS0_OPTION_NOMDEVICEID 65073 /* Nominum temporary assignment */
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#define EDNS0_OPTION_NOMCPEID 65074 /* Nominum temporary assignment */
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#define EDNS0_OPTION_UMBRELLA 20292 /* Cisco Umbrella temporary assignment */
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/* RFC-8914 extended errors, negative values are our definitions */
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#define EDE_UNSET -1 /* No extended DNS error available */
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#define EDE_OTHER 0 /* Other */
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#define EDE_USUPDNSKEY 1 /* Unsupported DNSKEY algo */
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#define EDE_USUPDS 2 /* Unsupported DS Digest */
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#define EDE_STALE 3 /* Stale answer */
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#define EDE_FORGED 4 /* Forged answer */
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#define EDE_DNSSEC_IND 5 /* DNSSEC Indeterminate */
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#define EDE_DNSSEC_BOGUS 6 /* DNSSEC Bogus */
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#define EDE_SIG_EXP 7 /* Signature Expired */
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#define EDE_SIG_NYV 8 /* Signature Not Yet Valid */
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#define EDE_NO_DNSKEY 9 /* DNSKEY missing */
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#define EDE_NO_RRSIG 10 /* RRSIGs missing */
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#define EDE_NO_ZONEKEY 11 /* No Zone Key Bit Set */
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#define EDE_NO_NSEC 12 /* NSEC Missing */
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#define EDE_CACHED_ERR 13 /* Cached Error */
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#define EDE_NOT_READY 14 /* Not Ready */
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#define EDE_BLOCKED 15 /* Blocked */
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#define EDE_CENSORED 16 /* Censored */
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#define EDE_FILTERED 17 /* Filtered */
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#define EDE_PROHIBITED 18 /* Prohibited */
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#define EDE_STALE_NXD 19 /* Stale NXDOMAIN */
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#define EDE_NOT_AUTH 20 /* Not Authoritative */
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#define EDE_NOT_SUP 21 /* Not Supported */
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#define EDE_NO_AUTH 22 /* No Reachable Authority */
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#define EDE_NETERR 23 /* Network error */
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#define EDE_INVALID_DATA 24 /* Invalid Data */
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struct dns_header {
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u16 id;
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u8 hb3,hb4;
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u16 qdcount,ancount,nscount,arcount;
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};
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#define HB3_QR 0x80 /* Query */
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#define HB3_OPCODE 0x78
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#define HB3_AA 0x04 /* Authoritative Answer */
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#define HB3_TC 0x02 /* TrunCated */
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#define HB3_RD 0x01 /* Recursion Desired */
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#define HB4_RA 0x80 /* Recursion Available */
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#define HB4_AD 0x20 /* Authenticated Data */
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#define HB4_CD 0x10 /* Checking Disabled */
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#define HB4_RCODE 0x0f
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#define OPCODE(x) (((x)->hb3 & HB3_OPCODE) >> 3)
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#define SET_OPCODE(x, code) (x)->hb3 = ((x)->hb3 & ~HB3_OPCODE) | code
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#define RCODE(x) ((x)->hb4 & HB4_RCODE)
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#define SET_RCODE(x, code) (x)->hb4 = ((x)->hb4 & ~HB4_RCODE) | code
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#define GETSHORT(s, cp) { \
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unsigned char *t_cp = (unsigned char *)(cp); \
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(s) = ((u16)t_cp[0] << 8) \
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| ((u16)t_cp[1]) \
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; \
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(cp) += 2; \
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}
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#define GETLONG(l, cp) { \
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unsigned char *t_cp = (unsigned char *)(cp); \
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(l) = ((u32)t_cp[0] << 24) \
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| ((u32)t_cp[1] << 16) \
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| ((u32)t_cp[2] << 8) \
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| ((u32)t_cp[3]) \
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; \
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(cp) += 4; \
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}
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#define PUTSHORT(s, cp) { \
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u16 t_s = (u16)(s); \
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unsigned char *t_cp = (unsigned char *)(cp); \
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*t_cp++ = t_s >> 8; \
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*t_cp = t_s; \
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(cp) += 2; \
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}
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#define PUTLONG(l, cp) { \
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u32 t_l = (u32)(l); \
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unsigned char *t_cp = (unsigned char *)(cp); \
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*t_cp++ = t_l >> 24; \
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*t_cp++ = t_l >> 16; \
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*t_cp++ = t_l >> 8; \
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*t_cp = t_l; \
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(cp) += 4; \
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}
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#define CHECK_LEN(header, pp, plen, len) \
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((size_t)((pp) - (unsigned char *)(header) + (len)) <= (plen))
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#define ADD_RDLEN(header, pp, plen, len) \
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(!CHECK_LEN(header, pp, plen, len) ? 0 : (((pp) += (len)), 1))
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/* Escape character in our presentation format for names.
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Cannot be '.' or /000 and must be !isprint().
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Note that escaped chars are stored as
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<NAME_ESCAPE> <orig-char+1>
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to ensure that the escaped form of /000 doesn't include /000
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*/
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#define NAME_ESCAPE 1
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