/* * This file is part of PowerDNS or dnsdist. * Copyright -- PowerDNS.COM B.V. and its contributors * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * In addition, for the avoidance of any doubt, permission is granted to * link this program with OpenSSL and to (re)distribute the binaries * produced as the result of such linking. * * 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, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #pragma once #include "qtype.hh" #include "dnsname.hh" #include #include #undef BADSIG // signal.h SIG_ERR struct DNSRecord; class RCode { public: enum rcodes_ { NoError=0, FormErr=1, ServFail=2, NXDomain=3, NotImp=4, Refused=5, YXDomain=6, YXRRSet=7, NXRRSet=8, NotAuth=9, NotZone=10}; static std::string to_s(uint8_t rcode); static std::string to_short_s(uint8_t rcode); const static std::array rcodes_s; }; class ERCode { public: enum rcodes_ { BADVERS=16, BADSIG=16, BADKEY=17, BADTIME=18, BADMODE=19, BADNAME=20, BADALG=21, BADTRUNC=22, BADCOOKIE=23 }; static std::string to_s(uint8_t rcode); }; class Opcode { public: enum { Query=0, IQuery=1, Status=2, Notify=4, Update=5 }; static std::string to_s(uint8_t opcode); }; //! This class represents a resource record class DNSResourceRecord { public: DNSResourceRecord() : last_modified(0), ttl(0), signttl(0), domain_id(-1), qclass(1), scopeMask(0), auth(1), disabled(0) {}; static DNSResourceRecord fromWire(const DNSRecord& d); enum Place : uint8_t {QUESTION=0, ANSWER=1, AUTHORITY=2, ADDITIONAL=3}; //!< Type describing the positioning within, say, a DNSPacket void setContent(const string& content); string getZoneRepresentation(bool noDot=false) const; // data DNSName qname; //!< the name of this record, for example: www.powerdns.com DNSName ordername; DNSName wildcardname; string content; //!< what this record points to. Example: 10.1.2.3 // Aligned on 8-byte boundaries on systems where time_t is 8 bytes and int // is 4 bytes, aka modern linux on x86_64 time_t last_modified; //!< For autocalculating SOA serial numbers - the backend needs to fill this in uint32_t ttl; //!< Time To Live of this record uint32_t signttl; //!< If non-zero, use this TTL as original TTL in the RRSIG int domain_id; //!< If a backend implements this, the domain_id of the zone this record is in QType qtype; //!< qtype of this record, ie A, CNAME, MX etc uint16_t qclass; //!< class of this record uint8_t scopeMask; bool auth; bool disabled; bool operator==(const DNSResourceRecord& rhs); bool operator<(const DNSResourceRecord &b) const { if(qname < b.qname) return true; if(qname == b.qname) return(content < b.content); return false; } }; #define GCCPACKATTRIBUTE __attribute__((packed)) struct dnsrecordheader { uint16_t d_type; uint16_t d_class; uint32_t d_ttl; uint16_t d_clen; } GCCPACKATTRIBUTE; struct EDNS0Record { uint8_t extRCode, version; uint16_t extFlags; } GCCPACKATTRIBUTE; static_assert(sizeof(EDNS0Record) == 4, "EDNS0Record size must be 4"); #if defined(__FreeBSD__) || defined(__APPLE__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__) #include #elif __linux__ || __GNU__ # include #else // with thanks to # define LITTLE_ENDIAN 1234 /* least-significant byte first (vax, pc) */ # define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */ # define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */ #if defined(vax) || defined(ns32000) || defined(sun386) || defined(i386) || \ defined(__i386) || defined(__ia64) || defined(__amd64) || \ defined(MIPSEL) || defined(_MIPSEL) || defined(BIT_ZERO_ON_RIGHT) || \ defined(__alpha__) || defined(__alpha) || \ (defined(__Lynx__) && defined(__x86__)) # define BYTE_ORDER LITTLE_ENDIAN #endif #if defined(sel) || defined(pyr) || defined(mc68000) || defined(sparc) || \ defined(__sparc) || \ defined(is68k) || defined(tahoe) || defined(ibm032) || defined(ibm370) || \ defined(MIPSEB) || defined(_MIPSEB) || defined(_IBMR2) || defined(DGUX) ||\ defined(apollo) || defined(__convex__) || defined(_CRAY) || \ defined(__hppa) || defined(__hp9000) || \ defined(__hp9000s300) || defined(__hp9000s700) || \ defined(__hp3000s900) || defined(MPE) || \ defined(BIT_ZERO_ON_LEFT) || defined(m68k) || \ (defined(__Lynx__) && \ (defined(__68k__) || defined(__sparc__) || defined(__powerpc__))) # define BYTE_ORDER BIG_ENDIAN #endif #endif struct dnsheader { unsigned id :16; /* query identification number */ #if BYTE_ORDER == BIG_ENDIAN /* fields in third byte */ unsigned qr: 1; /* response flag */ unsigned opcode: 4; /* purpose of message */ unsigned aa: 1; /* authoritative answer */ unsigned tc: 1; /* truncated message */ unsigned rd: 1; /* recursion desired */ /* fields in fourth byte */ unsigned ra: 1; /* recursion available */ unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */ unsigned ad: 1; /* authentic data from named */ unsigned cd: 1; /* checking disabled by resolver */ unsigned rcode :4; /* response code */ #elif BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN /* fields in third byte */ unsigned rd :1; /* recursion desired */ unsigned tc :1; /* truncated message */ unsigned aa :1; /* authoritative answer */ unsigned opcode :4; /* purpose of message */ unsigned qr :1; /* response flag */ /* fields in fourth byte */ unsigned rcode :4; /* response code */ unsigned cd: 1; /* checking disabled by resolver */ unsigned ad: 1; /* authentic data from named */ unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */ unsigned ra :1; /* recursion available */ #endif /* remaining bytes */ unsigned qdcount :16; /* number of question entries */ unsigned ancount :16; /* number of answer entries */ unsigned nscount :16; /* number of authority entries */ unsigned arcount :16; /* number of resource entries */ }; static_assert(sizeof(dnsheader) == 12, "dnsheader size must be 12"); class dnsheader_aligned { public: dnsheader_aligned(const void* mem) { if (reinterpret_cast(mem) % sizeof(uint32_t) == 0) { d_p = reinterpret_cast(mem); } else { memcpy(&d_h, mem, sizeof(dnsheader)); d_p = &d_h; } } const dnsheader* get() const { return d_p; } private: dnsheader d_h; const dnsheader *d_p; }; inline uint16_t * getFlagsFromDNSHeader(struct dnsheader * dh) { return (uint16_t*) (((char *) dh) + sizeof(uint16_t)); } #define DNS_TYPE_SIZE (2) #define DNS_CLASS_SIZE (2) #define DNS_TTL_SIZE (4) #define DNS_RDLENGTH_SIZE (2) #define EDNS_EXTENDED_RCODE_SIZE (1) #define EDNS_VERSION_SIZE (1) #define EDNS_OPTION_CODE_SIZE (2) #define EDNS_OPTION_LENGTH_SIZE (2) #if BYTE_ORDER == BIG_ENDIAN #define FLAGS_RD_OFFSET (8) #define FLAGS_CD_OFFSET (12) #elif BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN #define FLAGS_RD_OFFSET (0) #define FLAGS_CD_OFFSET (12) #endif uint32_t hashQuestion(const uint8_t* packet, uint16_t len, uint32_t init, bool& ok); struct TSIGTriplet { DNSName name, algo; string secret; };