| /* dnsmasq is Copyright (c) 2000-2015 Simon Kelley |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; version 2 dated June, 1991, or |
| (at your option) version 3 dated 29 June, 2007. |
| |
| This program 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 General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #define NAMESERVER_PORT 53 |
| #define TFTP_PORT 69 |
| |
| #define IN6ADDRSZ 16 |
| #define INADDRSZ 4 |
| |
| #define PACKETSZ 512 /* maximum packet size */ |
| #define MAXDNAME 1025 /* maximum presentation domain name */ |
| #define RRFIXEDSZ 10 /* #/bytes of fixed data in r record */ |
| #define MAXLABEL 63 /* maximum length of domain label */ |
| |
| #define NOERROR 0 /* no error */ |
| #define FORMERR 1 /* format error */ |
| #define SERVFAIL 2 /* server failure */ |
| #define NXDOMAIN 3 /* non existent domain */ |
| #define NOTIMP 4 /* not implemented */ |
| #define REFUSED 5 /* query refused */ |
| |
| #define QUERY 0 /* opcode */ |
| |
| #define C_IN 1 /* the arpa internet */ |
| #define C_CHAOS 3 /* for chaos net (MIT) */ |
| #define C_HESIOD 4 /* hesiod */ |
| #define C_ANY 255 /* wildcard match */ |
| |
| #define T_A 1 |
| #define T_NS 2 |
| #define T_MD 3 |
| #define T_MF 4 |
| #define T_CNAME 5 |
| #define T_SOA 6 |
| #define T_MB 7 |
| #define T_MG 8 |
| #define T_MR 9 |
| #define T_PTR 12 |
| #define T_MINFO 14 |
| #define T_MX 15 |
| #define T_TXT 16 |
| #define T_RP 17 |
| #define T_AFSDB 18 |
| #define T_RT 21 |
| #define T_SIG 24 |
| #define T_PX 26 |
| #define T_AAAA 28 |
| #define T_NXT 30 |
| #define T_SRV 33 |
| #define T_NAPTR 35 |
| #define T_KX 36 |
| #define T_DNAME 39 |
| #define T_OPT 41 |
| #define T_DS 43 |
| #define T_RRSIG 46 |
| #define T_NSEC 47 |
| #define T_DNSKEY 48 |
| #define T_NSEC3 50 |
| #define T_TKEY 249 |
| #define T_TSIG 250 |
| #define T_AXFR 252 |
| #define T_MAILB 253 |
| #define T_ANY 255 |
| |
| #define EDNS0_OPTION_MAC 65001 /* dyndns.org temporary assignment */ |
| #define EDNS0_OPTION_CLIENT_SUBNET 8 /* IANA */ |
| |
| struct dns_header { |
| u16 id; |
| u8 hb3,hb4; |
| u16 qdcount,ancount,nscount,arcount; |
| }; |
| |
| #define HB3_QR 0x80 /* Query */ |
| #define HB3_OPCODE 0x78 |
| #define HB3_AA 0x04 /* Authoritative Answer */ |
| #define HB3_TC 0x02 /* TrunCated */ |
| #define HB3_RD 0x01 /* Recursion Desired */ |
| |
| #define HB4_RA 0x80 /* Recursion Available */ |
| #define HB4_AD 0x20 /* Authenticated Data */ |
| #define HB4_CD 0x10 /* Checking Disabled */ |
| #define HB4_RCODE 0x0f |
| |
| #define OPCODE(x) (((x)->hb3 & HB3_OPCODE) >> 3) |
| #define SET_OPCODE(x, code) (x)->hb3 = ((x)->hb3 & ~HB3_OPCODE) | code |
| |
| #define RCODE(x) ((x)->hb4 & HB4_RCODE) |
| #define SET_RCODE(x, code) (x)->hb4 = ((x)->hb4 & ~HB4_RCODE) | code |
| |
| #define GETSHORT(s, cp) { \ |
| unsigned char *t_cp = (unsigned char *)(cp); \ |
| (s) = ((u16)t_cp[0] << 8) \ |
| | ((u16)t_cp[1]) \ |
| ; \ |
| (cp) += 2; \ |
| } |
| |
| #define GETLONG(l, cp) { \ |
| unsigned char *t_cp = (unsigned char *)(cp); \ |
| (l) = ((u32)t_cp[0] << 24) \ |
| | ((u32)t_cp[1] << 16) \ |
| | ((u32)t_cp[2] << 8) \ |
| | ((u32)t_cp[3]) \ |
| ; \ |
| (cp) += 4; \ |
| } |
| |
| #define PUTSHORT(s, cp) { \ |
| u16 t_s = (u16)(s); \ |
| unsigned char *t_cp = (unsigned char *)(cp); \ |
| *t_cp++ = t_s >> 8; \ |
| *t_cp = t_s; \ |
| (cp) += 2; \ |
| } |
| |
| #define PUTLONG(l, cp) { \ |
| u32 t_l = (u32)(l); \ |
| unsigned char *t_cp = (unsigned char *)(cp); \ |
| *t_cp++ = t_l >> 24; \ |
| *t_cp++ = t_l >> 16; \ |
| *t_cp++ = t_l >> 8; \ |
| *t_cp = t_l; \ |
| (cp) += 4; \ |
| } |
| |
| #define CHECK_LEN(header, pp, plen, len) \ |
| ((size_t)((pp) - (unsigned char *)(header) + (len)) <= (plen)) |
| |
| #define ADD_RDLEN(header, pp, plen, len) \ |
| (!CHECK_LEN(header, pp, plen, len) ? 0 : (((pp) += (len)), 1)) |
| |
| /* Escape character in our presentation format for names. |
| Cannot be '.' or /000 and must be !isprint(). |
| Note that escaped chars are stored as |
| <NAME_ESCAPE> <orig-char+1> |
| to ensure that the escaped form of /000 doesn't include /000 |
| */ |
| #define NAME_ESCAPE 1 |