1 files changed, 42 insertions, 0 deletions
diff --git a/src/packet/header.h b/src/packet/header.h
new file mode 100644
index 0000000..a824ec3
--- /dev/null
+++ b/src/packet/header.h
@@ -0,0 +1,42 @@
+#pragma once
+
+#include "buffer.h"
+
+#include <stdbool.h>
+
+typedef enum {
+    NOERROR,    // 0
+    FORMERR,    // 1
+    SERVFAIL,   // 2
+    NXDOMAIN,   // 3,
+    NOTIMP,     // 4
+    REFUSED,    // 5
+} ResultCode;
+
+uint8_t rescode_to_id(ResultCode code);
+ResultCode rescode_from_id(uint8_t id);
+
+typedef struct {
+    uint16_t id;
+
+    bool recursion_desired;     // 1 bit
+    bool truncated_message;     // 1 bit
+    bool authorative_answer;    // 1 bit
+    uint8_t opcode;               // 4 bits
+    bool response;              // 1 bit
+
+    ResultCode rescode;         // 4 bits
+    bool checking_disabled;     // 1 bit
+    bool authed_data;           // 1 bit
+    bool z;                     // 1 bit
+    bool recursion_available;   // 1 bit
+
+    uint16_t questions;               // 16 bits
+    uint16_t answers;                 // 16 bits
+    uint16_t authoritative_entries;   // 16 bits
+    uint16_t resource_entries;        // 16 bits
+} Header;
+
+void read_header(PacketBuffer* buffer, Header* header);
+void write_header(PacketBuffer* buffer, Header* header);
+const char* str_from_code(ResultCode code);