gnunet/src/vpn/gnunet-vpn-packet.h

#ifndef _GNTUN_PACKET_H_
#define _GNTUN_PACKET_H_

#include "platform.h"
#include "gnunet_common.h"

// Headers
struct pkt_tun {
	unsigned flags:16 GNUNET_PACKED;
	unsigned type:16 GNUNET_PACKED;
};

struct ip6_hdr {
	unsigned tclass_h:4 GNUNET_PACKED;
	unsigned version:4 GNUNET_PACKED;
	unsigned tclass_l:4 GNUNET_PACKED;
	unsigned flowlbl:20 GNUNET_PACKED;
	unsigned paylgth:16 GNUNET_PACKED;
	unsigned nxthdr:8 GNUNET_PACKED;
	unsigned hoplmt:8 GNUNET_PACKED;
	unsigned char sadr[16];
	unsigned char dadr[16];
};

struct ip_hdr {
	unsigned hdr_lngth:4 GNUNET_PACKED;
	unsigned version:4 GNUNET_PACKED;

	unsigned diff_serv:8 GNUNET_PACKED;
	unsigned tot_lngth:16 GNUNET_PACKED;

	unsigned ident:16 GNUNET_PACKED;
	unsigned flags:3 GNUNET_PACKED;
	unsigned frag_off:13 GNUNET_PACKED;

	unsigned ttl:8 GNUNET_PACKED;
	unsigned proto:8 GNUNET_PACKED;
	unsigned chks:16 GNUNET_PACKED;

	unsigned sadr:32 GNUNET_PACKED;
	unsigned dadr:32 GNUNET_PACKED;
};

#define TCP_FLAG_SYN 2

struct tcp_pkt {
	unsigned spt:16 GNUNET_PACKED;
	unsigned dpt:16 GNUNET_PACKED;
	unsigned seq:32 GNUNET_PACKED;
	unsigned ack:32 GNUNET_PACKED;
	unsigned off:4 GNUNET_PACKED;
	unsigned rsv:4 GNUNET_PACKED;
	unsigned flg:8 GNUNET_PACKED;
	unsigned wsz:16 GNUNET_PACKED;
	unsigned crc:16 GNUNET_PACKED;
	unsigned urg:16 GNUNET_PACKED;
};

struct udp_pkt {
	unsigned spt:16 GNUNET_PACKED;
	unsigned dpt:16 GNUNET_PACKED;
	unsigned len:16 GNUNET_PACKED;
	unsigned crc:16 GNUNET_PACKED;
};

struct icmp_hdr {
    unsigned type:8 GNUNET_PACKED;
    unsigned code:8 GNUNET_PACKED;
    unsigned chks:16 GNUNET_PACKED;
};

// DNS-Stuff
struct dns_static {
        uint16_t id GNUNET_PACKED;

	unsigned rd:1 GNUNET_PACKED; // recursion desired (client -> server)
	unsigned tc:1 GNUNET_PACKED; // message is truncated
	unsigned aa:1 GNUNET_PACKED; // authoritative answer
	unsigned op:4 GNUNET_PACKED; // query:0, inverse q.:1, status: 2
	unsigned qr:1 GNUNET_PACKED; // query:0, response:1

	unsigned rcode:4 GNUNET_PACKED; // 0 No error
	                  // 1 Format error
	                  // 2 Server failure
	                  // 3 Name Error
	                  // 4 Not Implemented
	                  // 5 Refused
	unsigned z:3 GNUNET_PACKED;  // reserved
	unsigned ra:1 GNUNET_PACKED; // recursion available (server -> client)

	uint16_t qdcount GNUNET_PACKED; // number of questions
        uint16_t ancount GNUNET_PACKED; // number of answers
	uint16_t nscount GNUNET_PACKED; // number of authority-records
	uint16_t arcount GNUNET_PACKED; // number of additional records
};

struct dns_pkt {
	struct dns_static s;
	unsigned char data[1];
};

struct dns_pkt_parsed {
	struct dns_static s;
	struct dns_query** queries;
	struct dns_record** answers;
	struct dns_record** nameservers;
	struct dns_record** additional;
};

struct dns_query_line {
    unsigned short type;
    unsigned short class;
};

struct dns_query {
	char* name;
	unsigned char namelen;
	unsigned short qtype;
	unsigned short qclass;
};

struct dns_record_line {
    unsigned short type;
    unsigned short class;
    unsigned int ttl;
    unsigned short data_len;
    unsigned char data;
};

struct dns_record {
	char* name;
	unsigned char namelen;
	unsigned short type;
	unsigned short class;
	unsigned int ttl;
	unsigned short data_len;
	unsigned char* data;
};

struct udp_dns {
	struct udp_pkt udp_hdr;
	struct dns_pkt data;
};

// Complete Packets
struct tun_pkt {
	struct GNUNET_MessageHeader shdr;
	struct pkt_tun tun;
};

struct ip6_pkt {
	struct GNUNET_MessageHeader shdr;
	struct pkt_tun tun;
	struct ip6_hdr ip6_hdr;
	unsigned char data[1];
};

struct ip6_tcp {
	struct GNUNET_MessageHeader shdr;
	struct pkt_tun tun;
	struct ip6_hdr ip6_hdr;
	struct tcp_pkt tcp_hdr;
	unsigned char data[1];
};

struct ip6_icmp {
    struct GNUNET_MessageHeader shdr;
    struct pkt_tun tun;
    struct ip6_hdr ip6_hdr;
    struct icmp_hdr icmp_hdr;
};

struct ip6_udp {
	struct GNUNET_MessageHeader shdr;
	struct pkt_tun tun;
	struct ip6_hdr ip6_hdr;
	struct udp_pkt udp_hdr;
	unsigned char data[1];
};

struct ip6_udp_dns {
	struct GNUNET_MessageHeader shdr;
	struct pkt_tun tun;
	struct ip6_hdr ip6_hdr;
	struct udp_dns udp_dns;
};

struct ip_pkt {
	struct GNUNET_MessageHeader shdr;
	struct pkt_tun tun;
	struct ip_hdr ip_hdr;
	unsigned char data[1];
};

struct ip_udp {
	struct GNUNET_MessageHeader shdr;
	struct pkt_tun tun;
	struct ip_hdr ip_hdr;
	struct udp_pkt udp_hdr;
	unsigned char data[1];
};

struct ip_udp_dns {
	struct GNUNET_MessageHeader shdr;
	struct pkt_tun tun;
	struct ip_hdr ip_hdr;
	struct udp_dns udp_dns;
};

struct ip_tcp {
	struct GNUNET_MessageHeader shdr;
	struct pkt_tun tun;
	struct ip_hdr ip_hdr;
	struct tcp_pkt tcp_hdr;
	unsigned char data[1];
};

struct ip_icmp {
    struct GNUNET_MessageHeader shdr;
    struct pkt_tun tun;
    struct ip_hdr ip_hdr;
    struct icmp_hdr icmp_hdr;
};

#endif