add infrastrtcur for creating and sending DNS packets

[catta] / dns.h

diff --git a/dns.h b/dns.h
new file mode 100644 (file)
index 0000000..5815a9a
--- /dev/null
+++ b/dns.h
@@ -0,0 +1,55 @@
+#ifndef foodnshfoo
+#define foodnshfoo
+
+#include <glib.h>
+
+#define FLX_DNS_MAX_PACKET_SIZE 9000
+
+typedef struct _flxDnsPacket {
+    guint size, rindex;
+    guint8 data[FLX_DNS_MAX_PACKET_SIZE];
+} flxDnsPacket;
+
+flxDnsPacket* flx_dns_packet_new(void);
+void flx_dns_packet_free(flxDnsPacket *p);
+void flx_dns_packet_set_field(flxDnsPacket *p, guint index, guint16 v);
+guint16 flx_dns_packet_get_field(flxDnsPacket *p, guint index);
+
+guint8 *flx_dns_packet_append_uint16(flxDnsPacket *p, guint16 v);
+guint8 *flx_dns_packet_append_name(flxDnsPacket *p, const gchar *name);
+guint8 *flx_dns_packet_append_name_compressed(flxDnsPacket *p, const gchar *name, guint8 *prev);
+guint8 *flx_dns_packet_extend(flxDnsPacket *p, guint l);
+gint flx_dns_packet_check_valid_response(flxDnsPacket *p);
+gint flx_dns_packet_check_valid(flxDnsPacket *p);
+
+gint flx_dns_packet_consume_name(flxDnsPacket *p, gchar *ret_name, guint l);
+gint flx_dns_packet_consume_uint16(flxDnsPacket *p, guint16 *ret_v);
+gint flx_dns_packet_consume_uint32(flxDnsPacket *p, guint32 *ret_v);
+gint flx_dns_packet_consume_bytes(flxDnsPacket *p, gpointer ret_data, guint l);
+gint flx_dns_packet_skip(flxDnsPacket *p, guint length);
+
+#define DNS_FIELD_ID 0
+#define DNS_FIELD_FLAGS 1
+#define DNS_FIELD_QDCOUNT 2
+#define DNS_FIELD_ANCOUNT 3
+#define DNS_FIELD_NSCOUNT 4
+#define DNS_FIELD_ARCOUNT 5
+
+#define DNS_FLAG_QR (1 << 15)
+#define DNS_FLAG_OPCODE (15 << 11)
+#define DNS_FLAG_RCODE (15)
+
+#define DNS_FLAGS(qr, opcode, aa, tc, rd, ra, z, ad, cd, rcode) \
+        (((guint16) !!qr << 15) |  \
+         ((guint16) (opcode & 15) << 11) | \
+         ((guint16) !!aa << 10) | \
+         ((guint16) !!tc << 9) | \
+         ((guint16) !!rd << 8) | \
+         ((guint16) !!ra << 7) | \
+         ((guint16) !!ad << 5) | \
+         ((guint16) !!cd << 4) | \
+         ((guint16) (rd & 15)))
+         
+
+#endif
+