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Diffstat (limited to '3rdParty/Ldns/src/include/ldns/packet.h')
| -rw-r--r-- | 3rdParty/Ldns/src/include/ldns/packet.h | 855 |
1 files changed, 855 insertions, 0 deletions
diff --git a/3rdParty/Ldns/src/include/ldns/packet.h b/3rdParty/Ldns/src/include/ldns/packet.h new file mode 100644 index 0000000..687a6a2 --- /dev/null +++ b/3rdParty/Ldns/src/include/ldns/packet.h @@ -0,0 +1,855 @@ +/* + * packet.h + * + * DNS packet definitions + * + * a Net::DNS like library for C + * + * (c) NLnet Labs, 2005-2006 + * + * See the file LICENSE for the license + */ + +/** + * \file + * + * Contains the definition of ldns_pkt and its parts, as well + * as functions to manipulate those. + */ + + +#ifndef LDNS_PACKET_H +#define LDNS_PACKET_H + +#define LDNS_MAX_PACKETLEN 65535 + +/* allow flags to be given to mk_query */ +#define LDNS_QR 1 /* QueRy - query flag */ +#define LDNS_AA 2 /* Authoritative Answer - server flag */ +#define LDNS_TC 4 /* TrunCated - server flag */ +#define LDNS_RD 8 /* Recursion Desired - query flag */ +#define LDNS_CD 16 /* Checking Disabled - query flag */ +#define LDNS_RA 32 /* Recursion Available - server flag */ +#define LDNS_AD 64 /* Authenticated Data - server flag */ + +#include <ldns/error.h> +#include <ldns/common.h> +#include <ldns/rr.h> +#include <sys/time.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/* opcodes for pkt's */ +enum ldns_enum_pkt_opcode { + LDNS_PACKET_QUERY = 0, + LDNS_PACKET_IQUERY = 1, + LDNS_PACKET_STATUS = 2, /* there is no 3?? DNS is weird */ + LDNS_PACKET_NOTIFY = 4, + LDNS_PACKET_UPDATE = 5 +}; +typedef enum ldns_enum_pkt_opcode ldns_pkt_opcode; + +/* rcodes for pkts */ +enum ldns_enum_pkt_rcode { + LDNS_RCODE_NOERROR = 0, + LDNS_RCODE_FORMERR = 1, + LDNS_RCODE_SERVFAIL = 2, + LDNS_RCODE_NXDOMAIN = 3, + LDNS_RCODE_NOTIMPL = 4, + LDNS_RCODE_REFUSED = 5, + LDNS_RCODE_YXDOMAIN = 6, + LDNS_RCODE_YXRRSET = 7, + LDNS_RCODE_NXRRSET = 8, + LDNS_RCODE_NOTAUTH = 9, + LDNS_RCODE_NOTZONE = 10 +}; +typedef enum ldns_enum_pkt_rcode ldns_pkt_rcode; + +/** + * Header of a dns packet + * + * Contains the information about the packet itself, as specified in RFC1035 +<pre> +4.1.1. Header section format + +The header contains the following fields: + + 1 1 1 1 1 1 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 + +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ + | ID | + +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ + |QR| Opcode |AA|TC|RD|RA| Z | RCODE | + +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ + | QDCOUNT | + +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ + | ANCOUNT | + +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ + | NSCOUNT | + +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ + | ARCOUNT | + +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ + +where: + +ID A 16 bit identifier assigned by the program that + generates any kind of query. This identifier is copied + the corresponding reply and can be used by the requester + to match up replies to outstanding queries. + +QR A one bit field that specifies whether this message is a + query (0), or a response (1). + +OPCODE A four bit field that specifies kind of query in this + message. This value is set by the originator of a query + and copied into the response. The values are: + + 0 a standard query (QUERY) + + 1 an inverse query (IQUERY) + + 2 a server status request (STATUS) + + 3-15 reserved for future use + +AA Authoritative Answer - this bit is valid in responses, + and specifies that the responding name server is an + authority for the domain name in question section. + + Note that the contents of the answer section may have + multiple owner names because of aliases. The AA bit + + corresponds to the name which matches the query name, or + the first owner name in the answer section. + +TC TrunCation - specifies that this message was truncated + due to length greater than that permitted on the + transmission channel. + +RD Recursion Desired - this bit may be set in a query and + is copied into the response. If RD is set, it directs + the name server to pursue the query recursively. + Recursive query support is optional. + +RA Recursion Available - this be is set or cleared in a + response, and denotes whether recursive query support is + available in the name server. + +Z Reserved for future use. Must be zero in all queries + and responses. + +RCODE Response code - this 4 bit field is set as part of + responses. The values have the following + interpretation: + + 0 No error condition + + 1 Format error - The name server was + unable to interpret the query. + + 2 Server failure - The name server was + unable to process this query due to a + problem with the name server. + + 3 Name Error - Meaningful only for + responses from an authoritative name + server, this code signifies that the + domain name referenced in the query does + not exist. + + 4 Not Implemented - The name server does + not support the requested kind of query. + + 5 Refused - The name server refuses to + perform the specified operation for + policy reasons. For example, a name + server may not wish to provide the + information to the particular requester, + or a name server may not wish to perform + a particular operation (e.g., zone + + transfer) for particular data. + + 6-15 Reserved for future use. + +QDCOUNT an unsigned 16 bit integer specifying the number of + entries in the question section. + +ANCOUNT an unsigned 16 bit integer specifying the number of + resource records in the answer section. + +NSCOUNT an unsigned 16 bit integer specifying the number of name + server resource records in the authority records + section. + +ARCOUNT an unsigned 16 bit integer specifying the number of + resource records in the additional records section. + +</pre> + */ +struct ldns_struct_hdr +{ + /** Id of a packet */ + uint16_t _id; + /** Query bit (0=query, 1=answer) */ + bool _qr; + /** Authoritative answer */ + bool _aa; + /** Packet truncated */ + bool _tc; + /** Recursion desired */ + bool _rd; + /** Checking disabled */ + bool _cd; + /** Recursion available */ + bool _ra; + /** Authentic data */ + bool _ad; + /** Query type */ + ldns_pkt_opcode _opcode; /* XXX 8 bits? */ + /** Response code */ + uint8_t _rcode; + /** question sec */ + uint16_t _qdcount; + /** answer sec */ + uint16_t _ancount; + /** auth sec */ + uint16_t _nscount; + /** add sec */ + uint16_t _arcount; +}; +typedef struct ldns_struct_hdr ldns_hdr; + +/** + * DNS packet + * + * This structure contains a complete DNS packet (either a query or an answer) + * + * It is the complete representation of what you actually send to a + * nameserver, and what it sends back (assuming you are the client here). + */ +struct ldns_struct_pkt +{ + /** Header section */ + ldns_hdr *_header; + /* extra items needed in a packet */ + /** The size of the wire format of the packet in octets */ + ldns_rdf *_answerfrom; + /** Timestamp of the time the packet was sent or created */ + struct timeval timestamp; + /** The duration of the query this packet is an answer to */ + uint32_t _querytime; + /** The size of the wire format of the packet in octets */ + size_t _size; + /** Optional tsig rr */ + ldns_rr *_tsig_rr; + /** EDNS0 available buffer size, see RFC2671 */ + uint16_t _edns_udp_size; + /** EDNS0 Extended rcode */ + uint8_t _edns_extended_rcode; + /** EDNS Version */ + uint8_t _edns_version; + /** Reserved EDNS data bits */ + uint16_t _edns_z; + /** Arbitrary EDNS rdata */ + ldns_rdf *_edns_data; + /** Question section */ + ldns_rr_list *_question; + /** Answer section */ + ldns_rr_list *_answer; + /** Authority section */ + ldns_rr_list *_authority; + /** Additional section */ + ldns_rr_list *_additional; +}; +typedef struct ldns_struct_pkt ldns_pkt; + +/** + * The sections of a packet + */ +enum ldns_enum_pkt_section { + LDNS_SECTION_QUESTION = 0, + LDNS_SECTION_ANSWER = 1, + LDNS_SECTION_AUTHORITY = 2, + LDNS_SECTION_ADDITIONAL = 3, + /** bogus section, if not interested */ + LDNS_SECTION_ANY = 4, + /** used to get all non-question rrs from a packet */ + LDNS_SECTION_ANY_NOQUESTION = 5 +}; +typedef enum ldns_enum_pkt_section ldns_pkt_section; + +/** + * The different types of packets + */ +enum ldns_enum_pkt_type { + LDNS_PACKET_QUESTION, + LDNS_PACKET_REFERRAL, + LDNS_PACKET_ANSWER, + LDNS_PACKET_NXDOMAIN, + LDNS_PACKET_NODATA, + LDNS_PACKET_UNKNOWN +}; +typedef enum ldns_enum_pkt_type ldns_pkt_type; + +/* prototypes */ + +/* read */ + +/** + * Read the packet id + * \param[in] p the packet + * \return the packet id + */ +uint16_t ldns_pkt_id(const ldns_pkt *p); +/** + * Read the packet's qr bit + * \param[in] p the packet + * \return value of the bit + */ +bool ldns_pkt_qr(const ldns_pkt *p); +/** + * Read the packet's aa bit + * \param[in] p the packet + * \return value of the bit + */ +bool ldns_pkt_aa(const ldns_pkt *p); +/** + * Read the packet's tc bit + * \param[in] p the packet + * \return value of the bit + */ +bool ldns_pkt_tc(const ldns_pkt *p); +/** + * Read the packet's rd bit + * \param[in] p the packet + * \return value of the bit + */ +bool ldns_pkt_rd(const ldns_pkt *p); +/** + * Read the packet's cd bit + * \param[in] p the packet + * \return value of the bit + */ +bool ldns_pkt_cd(const ldns_pkt *p); +/** + * Read the packet's ra bit + * \param[in] p the packet + * \return value of the bit + */ +bool ldns_pkt_ra(const ldns_pkt *p); +/** + * Read the packet's ad bit + * \param[in] p the packet + * \return value of the bit + */ +bool ldns_pkt_ad(const ldns_pkt *p); +/** + * Read the packet's code + * \param[in] p the packet + * \return the opcode + */ +ldns_pkt_opcode ldns_pkt_get_opcode(const ldns_pkt *p); +/** + * Return the packet's respons code + * \param[in] p the packet + * \return the respons code + */ +ldns_pkt_rcode ldns_pkt_get_rcode(const ldns_pkt *p); +/** + * Return the packet's qd count + * \param[in] p the packet + * \return the qd count + */ +uint16_t ldns_pkt_qdcount(const ldns_pkt *p); +/** + * Return the packet's an count + * \param[in] p the packet + * \return the an count + */ +uint16_t ldns_pkt_ancount(const ldns_pkt *p); +/** + * Return the packet's ns count + * \param[in] p the packet + * \return the ns count + */ +uint16_t ldns_pkt_nscount(const ldns_pkt *p); +/** + * Return the packet's ar count + * \param[in] p the packet + * \return the ar count + */ +uint16_t ldns_pkt_arcount(const ldns_pkt *p); + +/** + * Return the packet's answerfrom + * \param[in] p packet + * \return the name of the server + */ +ldns_rdf *ldns_pkt_answerfrom(const ldns_pkt *p); + +/** + * Return the packet's timestamp + * \param[in] p the packet + * \return the timestamp + */ +struct timeval ldns_pkt_timestamp(const ldns_pkt *p); +/** + * Return the packet's querytime + * \param[in] p the packet + * \return the querytime + */ +uint32_t ldns_pkt_querytime(const ldns_pkt *p); + +/** + * Return the packet's size in bytes + * \param[in] p the packet + * \return the size + */ +size_t ldns_pkt_size(const ldns_pkt *p); + +/** + * Return the packet's tsig pseudo rr's + * \param[in] p the packet + * \return the tsig rr + */ +ldns_rr *ldns_pkt_tsig(const ldns_pkt *p); + +/** + * Return the packet's question section + * \param[in] p the packet + * \return the section + */ +ldns_rr_list *ldns_pkt_question(const ldns_pkt *p); +/** + * Return the packet's answer section + * \param[in] p the packet + * \return the section + */ +ldns_rr_list *ldns_pkt_answer(const ldns_pkt *p); +/** + * Return the packet's authority section + * \param[in] p the packet + * \return the section + */ +ldns_rr_list *ldns_pkt_authority(const ldns_pkt *p); +/** + * Return the packet's additional section + * \param[in] p the packet + * \return the section + */ +ldns_rr_list *ldns_pkt_additional(const ldns_pkt *p); +/** + * Return the packet's question, answer, authority and additional sections + * concatenated, in a new rr_list clone. + * \param[in] p the packet + * \return the rrs + */ +ldns_rr_list *ldns_pkt_all(const ldns_pkt *p); +/** + * Return the packet's answer, authority and additional sections concatenated, + * in a new rr_list clone. Like ldns_pkt_all but without the questions. + * \param[in] p the packet + * \return the rrs except the question rrs + */ +ldns_rr_list *ldns_pkt_all_noquestion(const ldns_pkt *p); + +/** + * return all the rr_list's in the packet. Clone the lists, instead + * of returning pointers. + * \param[in] p the packet to look in + * \param[in] s what section(s) to return + * \return ldns_rr_list with the rr's or NULL if none were found + */ +ldns_rr_list *ldns_pkt_get_section_clone(const ldns_pkt *p, ldns_pkt_section s); + +/** + * return all the rr with a specific name from a packet. Optionally + * specify from which section in the packet + * \param[in] p the packet + * \param[in] r the name + * \param[in] s the packet's section + * \return a list with the rr's or NULL if none were found + */ +ldns_rr_list *ldns_pkt_rr_list_by_name(ldns_pkt *p, ldns_rdf *r, ldns_pkt_section s); +/** + * return all the rr with a specific type from a packet. Optionally + * specify from which section in the packet + * \param[in] p the packet + * \param[in] t the type + * \param[in] s the packet's section + * \return a list with the rr's or NULL if none were found + */ +ldns_rr_list *ldns_pkt_rr_list_by_type(const ldns_pkt *p, ldns_rr_type t, ldns_pkt_section s); +/** + * return all the rr with a specific type and type from a packet. Optionally + * specify from which section in the packet + * \param[in] packet the packet + * \param[in] ownername the name + * \param[in] type the type + * \param[in] sec the packet's section + * \return a list with the rr's or NULL if none were found + */ +ldns_rr_list *ldns_pkt_rr_list_by_name_and_type(const ldns_pkt *packet, const ldns_rdf *ownername, ldns_rr_type type, ldns_pkt_section sec); + + +/** + * check to see if an rr exist in the packet + * \param[in] pkt the packet to examine + * \param[in] sec in which section to look + * \param[in] rr the rr to look for + */ +bool ldns_pkt_rr(ldns_pkt *pkt, ldns_pkt_section sec, ldns_rr *rr); + + +/** + * sets the flags in a packet. + * \param[in] pkt the packet to operate on + * \param[in] flags ORed values: LDNS_QR| LDNS_AR for instance + * \return true on success otherwise false + */ +bool ldns_pkt_set_flags(ldns_pkt *pkt, uint16_t flags); + +/** + * Set the packet's id + * \param[in] p the packet + * \param[in] id the id to set + */ +void ldns_pkt_set_id(ldns_pkt *p, uint16_t id); +/** + * Set the packet's id to a random value + * \param[in] p the packet + */ +void ldns_pkt_set_random_id(ldns_pkt *p); +/** + * Set the packet's qr bit + * \param[in] p the packet + * \param[in] b the value to set (boolean) + */ +void ldns_pkt_set_qr(ldns_pkt *p, bool b); +/** + * Set the packet's aa bit + * \param[in] p the packet + * \param[in] b the value to set (boolean) + */ +void ldns_pkt_set_aa(ldns_pkt *p, bool b); +/** + * Set the packet's tc bit + * \param[in] p the packet + * \param[in] b the value to set (boolean) + */ +void ldns_pkt_set_tc(ldns_pkt *p, bool b); +/** + * Set the packet's rd bit + * \param[in] p the packet + * \param[in] b the value to set (boolean) + */ +void ldns_pkt_set_rd(ldns_pkt *p, bool b); +/** + * Set the packet's cd bit + * \param[in] p the packet + * \param[in] b the value to set (boolean) + */ +void ldns_pkt_set_cd(ldns_pkt *p, bool b); +/** + * Set the packet's ra bit + * \param[in] p the packet + * \param[in] b the value to set (boolean) + */ +void ldns_pkt_set_ra(ldns_pkt *p, bool b); +/** + * Set the packet's ad bit + * \param[in] p the packet + * \param[in] b the value to set (boolean) + */ +void ldns_pkt_set_ad(ldns_pkt *p, bool b); + +/** + * Set the packet's opcode + * \param[in] p the packet + * \param[in] c the opcode + */ +void ldns_pkt_set_opcode(ldns_pkt *p, ldns_pkt_opcode c); +/** + * Set the packet's respons code + * \param[in] p the packet + * \param[in] c the rcode + */ +void ldns_pkt_set_rcode(ldns_pkt *p, uint8_t c); +/** + * Set the packet's qd count + * \param[in] p the packet + * \param[in] c the count + */ +void ldns_pkt_set_qdcount(ldns_pkt *p, uint16_t c); +/** + * Set the packet's an count + * \param[in] p the packet + * \param[in] c the count + */ +void ldns_pkt_set_ancount(ldns_pkt *p, uint16_t c); +/** + * Set the packet's ns count + * \param[in] p the packet + * \param[in] c the count + */ +void ldns_pkt_set_nscount(ldns_pkt *p, uint16_t c); +/** + * Set the packet's arcount + * \param[in] p the packet + * \param[in] c the count + */ +void ldns_pkt_set_arcount(ldns_pkt *p, uint16_t c); +/** + * Set the packet's answering server + * \param[in] p the packet + * \param[in] r the address + */ +void ldns_pkt_set_answerfrom(ldns_pkt *p, ldns_rdf *r); +/** + * Set the packet's query time + * \param[in] p the packet + * \param[in] t the querytime in msec + */ +void ldns_pkt_set_querytime(ldns_pkt *p, uint32_t t); +/** + * Set the packet's size + * \param[in] p the packet + * \param[in] s the size + */ +void ldns_pkt_set_size(ldns_pkt *p, size_t s); + +/** + * Set the packet's timestamp + * \param[in] p the packet + * \param[in] timeval the timestamp + */ +void ldns_pkt_set_timestamp(ldns_pkt *p, struct timeval timeval); +/** + * Set a packet's section count to x + * \param[in] p the packet + * \param[in] s the section + * \param[in] x the section count + */ +void ldns_pkt_set_section_count(ldns_pkt *p, ldns_pkt_section s, uint16_t x); +/** + * Set the packet's tsig rr + * \param[in] p the packet + * \param[in] t the tsig rr + */ +void ldns_pkt_set_tsig(ldns_pkt *p, ldns_rr *t); + +/** + * looks inside the packet to determine + * what kind of packet it is, AUTH, NXDOMAIN, REFERRAL, etc. + * \param[in] p the packet to examine + * \return the type of packet + */ +ldns_pkt_type ldns_pkt_reply_type(ldns_pkt *p); + +/** + * return the packet's edns udp size + * \param[in] packet the packet + * \return the size + */ +uint16_t ldns_pkt_edns_udp_size(const ldns_pkt *packet); +/** + * return the packet's edns extended rcode + * \param[in] packet the packet + * \return the rcode + */ +uint8_t ldns_pkt_edns_extended_rcode(const ldns_pkt *packet); +/** + * return the packet's edns version + * \param[in] packet the packet + * \return the version + */ +uint8_t ldns_pkt_edns_version(const ldns_pkt *packet); +/** + * return the packet's edns z value + * \param[in] packet the packet + * \return the z value + */ +uint16_t ldns_pkt_edns_z(const ldns_pkt *packet); +/** + * return the packet's edns data + * \param[in] packet the packet + * \return the data + */ +ldns_rdf *ldns_pkt_edns_data(const ldns_pkt *packet); + +/** + * return the packet's edns do bit + * \param[in] packet the packet + * \return the bit's value + */ +bool ldns_pkt_edns_do(const ldns_pkt *packet); +/** + * Set the packet's edns do bit + * \param[in] packet the packet + * \param[in] value the bit's new value + */ +void ldns_pkt_set_edns_do(ldns_pkt *packet, bool value); + +/** + * returns true if this packet needs and EDNS rr to be sent. + * At the moment the only reason is an expected packet + * size larger than 512 bytes, but for instance dnssec would + * be a good reason too. + * + * \param[in] packet the packet to check + * \return true if packet needs edns rr + */ +bool ldns_pkt_edns(const ldns_pkt *packet); + +/** + * Set the packet's edns udp size + * \param[in] packet the packet + * \param[in] s the size + */ +void ldns_pkt_set_edns_udp_size(ldns_pkt *packet, uint16_t s); +/** + * Set the packet's edns extended rcode + * \param[in] packet the packet + * \param[in] c the code + */ +void ldns_pkt_set_edns_extended_rcode(ldns_pkt *packet, uint8_t c); +/** + * Set the packet's edns version + * \param[in] packet the packet + * \param[in] v the version + */ +void ldns_pkt_set_edns_version(ldns_pkt *packet, uint8_t v); +/** + * Set the packet's edns z value + * \param[in] packet the packet + * \param[in] z the value + */ +void ldns_pkt_set_edns_z(ldns_pkt *packet, uint16_t z); +/** + * Set the packet's edns data + * \param[in] packet the packet + * \param[in] data the data + */ +void ldns_pkt_set_edns_data(ldns_pkt *packet, ldns_rdf *data); + +/** + * allocates and initializes a ldns_pkt structure. + * \return pointer to the new packet + */ +ldns_pkt *ldns_pkt_new(); + +/** + * frees the packet structure and all data that it contains. + * \param[in] packet The packet structure to free + * \return void + */ +void ldns_pkt_free(ldns_pkt *packet); + +/** + * creates a query packet for the given name, type, class. + * \param[out] p the packet to be returned + * \param[in] rr_name the name to query for (as string) + * \param[in] rr_type the type to query for + * \param[in] rr_class the class to query for + * \param[in] flags packet flags + * \return LDNS_STATUS_OK or a ldns_status mesg with the error + */ +ldns_status ldns_pkt_query_new_frm_str(ldns_pkt **p, const char *rr_name, ldns_rr_type rr_type, ldns_rr_class rr_class , uint16_t flags); + +/** + * creates a packet with a query in it for the given name, type and class. + * \param[in] rr_name the name to query for + * \param[in] rr_type the type to query for + * \param[in] rr_class the class to query for + * \param[in] flags packet flags + * \return ldns_pkt* a pointer to the new pkt + */ +ldns_pkt *ldns_pkt_query_new(ldns_rdf *rr_name, ldns_rr_type rr_type, ldns_rr_class rr_class, uint16_t flags); + +/** + * clones the given packet, creating a fully allocated copy + * + * \param[in] pkt the packet to clone + * \return ldns_pkt* pointer to the new packet + */ +ldns_pkt *ldns_pkt_clone(ldns_pkt *pkt); + +/** + * directly set the additional section + * \param[in] p packet to operate on + * \param[in] rr rrlist to set + */ +void ldns_pkt_set_additional(ldns_pkt *p, ldns_rr_list *rr); + +/** + * directly set the answer section + * \param[in] p packet to operate on + * \param[in] rr rrlist to set + */ +void ldns_pkt_set_answer(ldns_pkt *p, ldns_rr_list *rr); + +/** + * directly set the question section + * \param[in] p packet to operate on + * \param[in] rr rrlist to set + */ +void ldns_pkt_set_question(ldns_pkt *p, ldns_rr_list *rr); + +/** + * directly set the auhority section + * \param[in] p packet to operate on + * \param[in] rr rrlist to set + */ +void ldns_pkt_set_authority(ldns_pkt *p, ldns_rr_list *rr); + +/** + * push an rr on a packet + * \param[in] packet packet to operate on + * \param[in] section where to put it + * \param[in] rr rr to push + * \return a boolean which is true when the rr was added + */ +bool ldns_pkt_push_rr(ldns_pkt *packet, ldns_pkt_section section, ldns_rr *rr); + +/** + * push an rr on a packet, provided the RR is not there. + * \param[in] pkt packet to operate on + * \param[in] sec where to put it + * \param[in] rr rr to push + * \return a boolean which is true when the rr was added + */ +bool ldns_pkt_safe_push_rr(ldns_pkt *pkt, ldns_pkt_section sec, ldns_rr *rr); + +/** + * push a rr_list on a packet + * \param[in] packet packet to operate on + * \param[in] section where to put it + * \param[in] list the rr_list to push + * \return a boolean which is true when the rr was added + */ +bool ldns_pkt_push_rr_list(ldns_pkt *packet, ldns_pkt_section section, ldns_rr_list *list); + +/** + * push an rr_list to a packet, provided the RRs are not already there. + * \param[in] pkt packet to operate on + * \param[in] sec where to put it + * \param[in] list the rr_list to push + * \return a boolean which is true when the rr was added + */ +bool ldns_pkt_safe_push_rr_list(ldns_pkt *pkt, ldns_pkt_section sec, ldns_rr_list *list); + +/** + * check if a packet is empty + * \param[in] p packet + * \return true: empty, false: not empty + */ +bool ldns_pkt_empty(ldns_pkt *p); + +#ifdef __cplusplus +} +#endif + +#endif /* LDNS_PACKET_H */ |