dns_opcode_t
#define dns_opcode_query ((dns_opcode_t)dns_opcode_query)
#define dns_opcode_iquery ((dns_opcode_t)dns_opcode_iquery)
#define dns_opcode_status ((dns_opcode_t)dns_opcode_status)
#define dns_opcode_notify ((dns_opcode_t)dns_opcode_notify)
typedef uint16_t dns_opcode_t;