/* * Copyright (C) 1996-2023 The Squid Software Foundation and contributors * * Squid software is distributed under GPLv2+ license and includes * contributions from numerous individuals and organizations. * Please see the COPYING and CONTRIBUTORS files for details. */ #ifndef SQUID_SRC_DNS_RFC1035_H #define SQUID_SRC_DNS_RFC1035_H #if HAVE_SYS_TYPES_H #include #endif #if HAVE_NETINET_IN_H #include #endif #if HAVE_ARPA_INET_H #include #endif #include "rfc2181.h" /** \par RFC 1035 Section 3.1: * To simplify implementations, the total length of a domain name (i.e., * label octets and label length octets) is restricted to 255 octets or * less. *\par * Clarified by RFC 2181 Section 11. (RFC2181_MAXHOSTNAMELEN) */ #define RFC1035_MAXHOSTNAMESZ RFC2181_MAXHOSTNAMELEN #define RFC1035_DEFAULT_PACKET_SZ 512 class rfc1035_rr { public: char name[RFC1035_MAXHOSTNAMESZ]; unsigned short type; unsigned short _class; unsigned int ttl; unsigned short rdlength; char *rdata; }; typedef struct _rfc1035_query rfc1035_query; struct _rfc1035_query { char name[RFC1035_MAXHOSTNAMESZ]; unsigned short qtype; unsigned short qclass; }; typedef struct _rfc1035_message rfc1035_message; struct _rfc1035_message { unsigned short id; unsigned int qr:1; unsigned int opcode:4; unsigned int aa:1; unsigned int tc:1; unsigned int rd:1; unsigned int ra:1; unsigned int rcode:4; unsigned short qdcount; unsigned short ancount; unsigned short nscount; unsigned short arcount; rfc1035_query *query; rfc1035_rr *answer; }; ssize_t rfc1035BuildAQuery(const char *hostname, char *buf, size_t sz, unsigned short qid, rfc1035_query * query, ssize_t edns_sz); ssize_t rfc1035BuildPTRQuery(const struct in_addr, char *buf, size_t sz, unsigned short qid, rfc1035_query * query, ssize_t edns_sz); void rfc1035SetQueryID(char *, unsigned short qid); int rfc1035MessageUnpack(const char *buf, size_t sz, rfc1035_message ** answer); int rfc1035QueryCompare(const rfc1035_query *, const rfc1035_query *); void rfc1035RRDestroy(rfc1035_rr ** rr, int n); void rfc1035MessageDestroy(rfc1035_message ** message); const char * rfc1035ErrorMessage(int n); #define RFC1035_TYPE_A 1 #define RFC1035_TYPE_CNAME 5 #define RFC1035_TYPE_PTR 12 #define RFC1035_CLASS_IN 1 /* Child Library RFC3596 Depends on some otherwise internal functions */ int rfc1035HeaderPack(char *buf, size_t sz, rfc1035_message * hdr); int rfc1035HeaderUnpack(const char *buf, size_t sz, unsigned int *off, rfc1035_message * h); int rfc1035QuestionPack(char *buf, size_t sz, const char *name, const unsigned short type, const unsigned short _class); int rfc1035RRPack(char *buf, size_t sz, const rfc1035_rr * RR); #endif /* SQUID_SRC_DNS_RFC1035_H */