17 /* See RFC 1035, 4.1.1 Header section format
18  * DNS Message Header is always 12 bytes
44 /* RFC 1035 '4.1.1. Header section format' defines the following flags:
50 /* These two defines represent the 3rd and 4th bytes of the DNS msg header.
51  * See RFC 1035, 4.1.1. Header section format.
183 /** It returns the ID field in the DNS msg header	*/
184 static inline int dns_header_id(uint8_t *header)  in dns_header_id()  argument
186 	return htons(UNALIGNED_GET((uint16_t *)(header)));  in dns_header_id()
193 static inline int dns_unpack_header_id(uint8_t *header)  in dns_unpack_header_id()  argument
195 	return ntohs(UNALIGNED_GET((uint16_t *)(header)));  in dns_unpack_header_id()
198 /** It returns the QR field in the DNS msg header	*/
199 static inline int dns_header_qr(uint8_t *header)  in dns_header_qr()  argument
201 	return ((*(header + 2)) & 0x80) ? 1 : 0;  in dns_header_qr()
204 /** It returns the OPCODE field in the DNS msg header	*/
205 static inline int dns_header_opcode(uint8_t *header)  in dns_header_opcode()  argument
207 	return ((*(header + 2)) & 0x70) >> 1;  in dns_header_opcode()
210 /** It returns the AA field in the DNS msg header	*/
211 static inline int dns_header_aa(uint8_t *header)  in dns_header_aa()  argument
213 	return ((*(header + 2)) & 0x04) ? 1 : 0;  in dns_header_aa()
216 /** It returns the TC field in the DNS msg header	*/
217 static inline int dns_header_tc(uint8_t *header)  in dns_header_tc()  argument
219 	return ((*(header + 2)) & 0x02) ? 1 : 0;  in dns_header_tc()
222 /** It returns the RD field in the DNS msg header	*/
223 static inline int dns_header_rd(uint8_t *header)  in dns_header_rd()  argument
225 	return ((*(header + 2)) & 0x01) ? 1 : 0;  in dns_header_rd()
228 /** It returns the RA field in the DNS msg header	*/
229 static inline int dns_header_ra(uint8_t *header)  in dns_header_ra()  argument
231 	return ((*(header + 3)) & 0x80) >> 7;  in dns_header_ra()
234 /** It returns the Z field in the DNS msg header	*/
235 static inline int dns_header_z(uint8_t *header)  in dns_header_z()  argument
237 	return ((*(header + 3)) & 0x70) >> 4;  in dns_header_z()
240 /** It returns the RCODE field in the DNS msg header	*/
241 static inline int dns_header_rcode(uint8_t *header)  in dns_header_rcode()  argument
243 	return ((*(header + 3)) & 0x0F);  in dns_header_rcode()
246 /** It returns the QDCOUNT field in the DNS msg header	*/
247 static inline int dns_header_qdcount(uint8_t *header)  in dns_header_qdcount()  argument
249 	return htons(UNALIGNED_GET((uint16_t *)(header + 4)));  in dns_header_qdcount()
252 static inline int dns_unpack_header_qdcount(uint8_t *header)  in dns_unpack_header_qdcount()  argument
254 	return ntohs(UNALIGNED_GET((uint16_t *)(header + 4)));  in dns_unpack_header_qdcount()
257 /** It returns the ANCOUNT field in the DNS msg header	*/
258 static inline int dns_header_ancount(uint8_t *header)  in dns_header_ancount()  argument
260 	return htons(UNALIGNED_GET((uint16_t *)(header + 6)));  in dns_header_ancount()
263 static inline int dns_unpack_header_ancount(uint8_t *header)  in dns_unpack_header_ancount()  argument
265 	return ntohs(UNALIGNED_GET((uint16_t *)(header + 6)));  in dns_unpack_header_ancount()
268 /** It returns the NSCOUNT field in the DNS msg header	*/
269 static inline int dns_header_nscount(uint8_t *header)  in dns_header_nscount()  argument
271 	return htons(UNALIGNED_GET((uint16_t *)(header + 8)));  in dns_header_nscount()
274 /** It returns the ARCOUNT field in the DNS msg header	*/
275 static inline int dns_header_arcount(uint8_t *header)  in dns_header_arcount()  argument
277 	return htons(UNALIGNED_GET((uint16_t *)(header + 10)));  in dns_header_arcount()
352  * @brief Unpacks the header's response.
358  * @retval -ENOMEM if the buffer in msg has no enough space to store the header.
359  *         The header is always 12 bytes length.
360  * @retval -EINVAL if the src_id does not match the header's id, or if the
361  *         header's QR value is not DNS_RESPONSE or if the header's OPCODE
362  *         value is not DNS_QUERY, or if the header's Z value is not 0 or if
392  *          12 bytes i.e., after the message's header. This function computes
432  * @retval -ENOMEM if the buffer in msg has no enough space to store the header.
433  *         The header is always 12 bytes length.
434  * @retval -EINVAL if the src_id does not match the header's id, or if the
435  *         header's QR value is not DNS_RESPONSE or if the header's OPCODE
436  *         value is not DNS_QUERY, or if the header's Z value is not 0 or if