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dnsmasq 2.84

    1: /* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
    2: 
    3:    This program is free software; you can redistribute it and/or modify
    4:    it under the terms of the GNU General Public License as published by
    5:    the Free Software Foundation; version 2 dated June, 1991, or
    6:    (at your option) version 3 dated 29 June, 2007.
    7:  
    8:    This program is distributed in the hope that it will be useful,
    9:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   10:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   11:    GNU General Public License for more details.
   12:      
   13:    You should have received a copy of the GNU General Public License
   14:    along with this program.  If not, see <http://www.gnu.org/licenses/>.
   15: */
   16: 
   17: #define NAMESERVER_PORT 53
   18: #define TFTP_PORT       69
   19: #define MIN_PORT        1024           /* first non-reserved port */
   20: #define MAX_PORT        65535u
   21: 
   22: #define IN6ADDRSZ       16
   23: #define INADDRSZ        4
   24: 
   25: #define PACKETSZ	512		/* maximum packet size */
   26: #define MAXDNAME	1025		/* maximum presentation domain name */
   27: #define RRFIXEDSZ	10		/* #/bytes of fixed data in r record */
   28: #define MAXLABEL        63              /* maximum length of domain label */
   29: 
   30: #define NOERROR		0		/* no error */
   31: #define FORMERR		1		/* format error */
   32: #define SERVFAIL	2		/* server failure */
   33: #define NXDOMAIN	3		/* non existent domain */
   34: #define NOTIMP		4		/* not implemented */
   35: #define REFUSED		5		/* query refused */
   36: 
   37: #define QUERY           0               /* opcode */
   38: 
   39: #define C_IN            1               /* the arpa internet */
   40: #define C_CHAOS         3               /* for chaos net (MIT) */
   41: #define C_HESIOD        4               /* hesiod */
   42: #define C_ANY           255             /* wildcard match */
   43: 
   44: #define T_A		1
   45: #define T_NS            2
   46: #define T_MD            3
   47: #define T_MF            4             
   48: #define T_CNAME		5
   49: #define T_SOA		6
   50: #define T_MB            7
   51: #define T_MG            8
   52: #define T_MR            9
   53: #define T_PTR		12
   54: #define T_MINFO         14
   55: #define T_MX		15
   56: #define T_TXT		16
   57: #define T_RP            17
   58: #define T_AFSDB         18
   59: #define T_RT            21
   60: #define T_SIG		24
   61: #define T_PX            26
   62: #define T_AAAA		28
   63: #define T_NXT           30
   64: #define T_SRV		33
   65: #define T_NAPTR		35
   66: #define T_KX            36
   67: #define T_DNAME         39
   68: #define T_OPT		41
   69: #define T_DS            43
   70: #define T_RRSIG         46
   71: #define T_NSEC          47
   72: #define T_DNSKEY        48
   73: #define T_NSEC3         50
   74: #define	T_TKEY		249		
   75: #define	T_TSIG		250
   76: #define T_AXFR          252
   77: #define T_MAILB		253	
   78: #define T_ANY		255
   79: #define T_CAA           257
   80: 
   81: #define EDNS0_OPTION_MAC            65001 /* dyndns.org temporary assignment */
   82: #define EDNS0_OPTION_CLIENT_SUBNET  8     /* IANA */
   83: #define EDNS0_OPTION_NOMDEVICEID    65073 /* Nominum temporary assignment */
   84: #define EDNS0_OPTION_NOMCPEID       65074 /* Nominum temporary assignment */
   85: 
   86: struct dns_header {
   87:   u16 id;
   88:   u8  hb3,hb4;
   89:   u16 qdcount,ancount,nscount,arcount;
   90: };
   91: 
   92: #define HB3_QR       0x80 /* Query */
   93: #define HB3_OPCODE   0x78
   94: #define HB3_AA       0x04 /* Authoritative Answer */
   95: #define HB3_TC       0x02 /* TrunCated */
   96: #define HB3_RD       0x01 /* Recursion Desired */
   97: 
   98: #define HB4_RA       0x80 /* Recursion Available */
   99: #define HB4_AD       0x20 /* Authenticated Data */
  100: #define HB4_CD       0x10 /* Checking Disabled */
  101: #define HB4_RCODE    0x0f
  102: 
  103: #define OPCODE(x)          (((x)->hb3 & HB3_OPCODE) >> 3)
  104: #define SET_OPCODE(x, code) (x)->hb3 = ((x)->hb3 & ~HB3_OPCODE) | code
  105: 
  106: #define RCODE(x)           ((x)->hb4 & HB4_RCODE)
  107: #define SET_RCODE(x, code) (x)->hb4 = ((x)->hb4 & ~HB4_RCODE) | code
  108:   
  109: #define GETSHORT(s, cp) { \
  110: 	unsigned char *t_cp = (unsigned char *)(cp); \
  111: 	(s) = ((u16)t_cp[0] << 8) \
  112: 	    | ((u16)t_cp[1]) \
  113: 	    ; \
  114: 	(cp) += 2; \
  115: }
  116: 
  117: #define GETLONG(l, cp) { \
  118: 	unsigned char *t_cp = (unsigned char *)(cp); \
  119: 	(l) = ((u32)t_cp[0] << 24) \
  120: 	    | ((u32)t_cp[1] << 16) \
  121: 	    | ((u32)t_cp[2] << 8) \
  122: 	    | ((u32)t_cp[3]) \
  123: 	    ; \
  124: 	(cp) += 4; \
  125: }
  126: 
  127: #define PUTSHORT(s, cp) { \
  128: 	u16 t_s = (u16)(s); \
  129: 	unsigned char *t_cp = (unsigned char *)(cp); \
  130: 	*t_cp++ = t_s >> 8; \
  131: 	*t_cp   = t_s; \
  132: 	(cp) += 2; \
  133: }
  134: 
  135: #define PUTLONG(l, cp) { \
  136: 	u32 t_l = (u32)(l); \
  137: 	unsigned char *t_cp = (unsigned char *)(cp); \
  138: 	*t_cp++ = t_l >> 24; \
  139: 	*t_cp++ = t_l >> 16; \
  140: 	*t_cp++ = t_l >> 8; \
  141: 	*t_cp   = t_l; \
  142: 	(cp) += 4; \
  143: }
  144: 
  145: #define CHECK_LEN(header, pp, plen, len) \
  146:     ((size_t)((pp) - (unsigned char *)(header) + (len)) <= (plen))
  147: 
  148: #define ADD_RDLEN(header, pp, plen, len) \
  149:   (!CHECK_LEN(header, pp, plen, len) ? 0 : (((pp) += (len)), 1))
  150: 
  151: /* Escape character in our presentation format for names.
  152:    Cannot be '.' or /000 and must be !isprint().
  153:    Note that escaped chars are stored as
  154:    <NAME_ESCAPE> <orig-char+1>
  155:    to ensure that the escaped form of /000 doesn't include /000
  156: */
  157: #define NAME_ESCAPE 1