mirror of
https://code.semirocket.science/wrapsix
synced 2024-11-10 08:10:59 +02:00
104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
#ifndef WRAPPER_H
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#define WRAPPER_H
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#include <pcap.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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/* Default snap length (maximum bytes per packet to capture) */
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#define SNAP_LEN BUFSIZ
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/* Ethernet headers are always exactly 14 bytes */
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#define SIZE_ETHERNET 14
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/* Ethernet addresses are 6 bytes */
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#define ETHER_ADDR_LEN 6
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/* IPv6 headers are always exactly 40 bytes */
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#define SIZE_IP6 40
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/* Ethernet header */
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struct s_ethernet {
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u_char ether_dhost[ETHER_ADDR_LEN]; /* destination host address */
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u_char ether_shost[ETHER_ADDR_LEN]; /* source host address */
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u_short ether_type; /* IP/ARP/RARP/... */
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};
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/* IPv4 header */
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/* IPv6 header */
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struct s_ip6 {
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unsigned char ver; /* 8 b; version */
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unsigned char traffic_class; /* 8 b; traffic class */
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unsigned short flow_label; /* 16 b; flow label (qos) */
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unsigned short len; /* 16 b; payload length */
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unsigned char next_header; /* 8 b; next header */
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unsigned char hop_limit; /* 8 b; hop limit (replaces ttl) */
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struct in6_addr ip_src; /* 128 b; source address */
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struct in6_addr ip_dest; /* 128 b; destination address */
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};
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/* TCP structure - only needed fields! */
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struct s_tcp {
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unsigned short port_src; /* 16 b; source port */
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unsigned short port_dest; /* 16 b; destination port */
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long double data1; /* 96 b; first data segment */
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unsigned short checksum; /* 16 b */
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unsigned short data2; /* 16 b; the rest (urgent pointer here) */
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};
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/* UDP structure */
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/* ICMP header structure */
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struct s_icmp {
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unsigned char type; /* 8 b; ICMP type */
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unsigned char code; /* 8 b; further specification of ICMP type */
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unsigned short checksum; /* 16 b */
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};
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/* ICMP - ping structure */
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struct s_icmp_ping {
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unsigned short id; /* 16 b; ID value for ECHO REPLY */
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unsigned short seq; /* 16 b; sequence value for ECHO REPLY */
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};
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/* ICMPv6 - NDP NS structure */
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struct s_icmp_ndp_ns {
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unsigned int zeros; /* 32 b; reserved section */
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struct in6_addr target; /* 128 b; target IP address */
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};
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struct s_icmp_ndp_option {
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unsigned char type; /* 8 b; type of the option */
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unsigned char len; /* 8 b; length of the option (including this header!) */
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};
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/* ICMP types */
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#define ICMP4_ECHO_REQUEST 0x8
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#define ICMP4_ECHO_REPLY 0x0
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/* ICMPv6 types */
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#define ICMP6_ECHO_REQUEST 0x80
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#define ICMP6_ECHO_REPLY 0x81
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#define ICMP6_NDP_RS 0x85
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#define ICMP6_NDP_RA 0x86
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#define ICMP6_NDP_NS 0x87
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#define ICMP6_NDP_NA 0x88
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#define ICMP6_NDP_RM 0x89
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/* Prototypes */
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void process_packet6(u_char *args, const struct pcap_pkthdr *header, const u_char *packet);
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void process_icmp6(const struct s_ip6 *ip, const unsigned char *payload);
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void send_there(struct in_addr ip4_addr, unsigned char ttl, unsigned int type, unsigned char *payload, unsigned int paylen);
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unsigned short checksum(const void *_buf, int len);
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#endif
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