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311 lines
10 KiB
311 lines
10 KiB
/*
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* File - dhcp-headers.h
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* dhcp-headers.h - header structure for dhcp packets
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*/
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#ifndef HEADERS_H
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#include<sys/types.h>
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#include<netinet/in.h>
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#define HEADERS_H
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/*
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* Functions used in functions.c
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*/
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int open_socket(); /* Opens PF_PACKET socket*/
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int close_socket(); /* Close PF_PACKET socket */
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int set_promisc();
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int clear_promisc();
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int send_packet(int pkt_type); /* Sends DHCP packet socket*/
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int recv_packet(int pkt_type); /* Receives DHCP packet on socket*/
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int reset_dhopt_size(); /* Resets the dhopt_size to zero */
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int set_rand_dhcp_xid(); /* Sets a random DHCP xid */
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int build_option53(int msg_type); /* Option53: MSGTYPE. Builds option53*/
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int build_option55(); /* Requested parameters list */
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int build_option54(); /* Builds server identifier on DHCP request */
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int build_option50(); /* Option50: Rqstd IP. Builds option50*/
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int build_option51(); /* Option51: Rqstd lease time. Builds option51*/
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int build_option60_vci(); /* Vendor class identifier */
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int build_option12_hostname(); /* Hostname */
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int build_option81_fqdn(); /* FQDN */
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int build_optioneof(); /* End of option */
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int build_dhpacket(int pkt_type); /* Build DHCP disc, req packets */
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int build_packet(int pkt_type); /* Builds ARP and ICMP reply packets */
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int print_buff(u_int8_t *buff, int size);/* Debug routine */
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int map_all_layer_ptr(int pkt_type); /* maps all layer pointer on DHCP packet */
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int check_packet(int pkt_type); /* Checks the packet for DHCP offer & ack */
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int print_dhinfo(int pkt_type); /* Prints DHCP offer & ack informations */
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int log_dhinfo(); /* Logs DHCP IP info to log file */
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int get_dhinfo(); /* Reads log file for mac, ip, serv_ip info */
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char *get_ip_str(u_int32_t ip); /* Convert in_addr to string */
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u_int32_t get_interface_address(); /* Return the IP address of the interface. */
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int set_serv_id_opt50(); /* Sets the server_ip and option50 ip */
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/*
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* Libnet defines header sizes for every builder function exported.
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*/
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#define ETHER_H 0x10 /* Ethernet header: 14 bytes */
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#define ETHER_ADDR_LEN 0x6 /* Ethernet address len: 6 bytes */
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#define IP_ADDR_LEN 0x4
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#define VLAN_H 0x12 /* Ethernet header + vlan header*/
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#define IP_H 0x20 /* IP header: 20 bytes */
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#define UDP_H 0x8 /* UDP header: 8 bytes */
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#define ICMP_H 0x8
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#define ICMP_PAYLOAD 0x3c /* 60 bytes of ICMP payload */
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#define DHCPV4_H 0xf0 /**< DHCP v4 header: 240 bytes */
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#define ARP_H_LEN 0x08
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/*
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* ARP header
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* Address Resolution Protocol
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* Base header size: 8 bytes
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*/
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struct arp_hdr
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{
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u_int16_t ar_hrd; /* format of hardware address */
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#define ARPHRD_NETROM 0 /* from KA9Q: NET/ROM pseudo */
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#define ARPHRD_ETHER 1 /* Ethernet 10Mbps */
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#define ARPHRD_EETHER 2 /* Experimental Ethernet */
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#define ARPHRD_AX25 3 /* AX.25 Level 2 */
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#define ARPHRD_PRONET 4 /* PROnet token ring */
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#define ARPHRD_CHAOS 5 /* Chaosnet */
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#define ARPHRD_IEEE802 6 /* IEEE 802.2 Ethernet/TR/TB */
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#define ARPHRD_ARCNET 7 /* ARCnet */
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#define ARPHRD_APPLETLK 8 /* APPLEtalk */
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#define ARPHRD_LANSTAR 9 /* Lanstar */
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#define ARPHRD_DLCI 15 /* Frame Relay DLCI */
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#define ARPHRD_ATM 19 /* ATM */
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#define ARPHRD_METRICOM 23 /* Metricom STRIP (new IANA id) */
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#define ARPHRD_IPSEC 31 /* IPsec tunnel */
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u_int16_t ar_pro; /* format of protocol address */
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u_int8_t ar_hln; /* length of hardware address */
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u_int8_t ar_pln; /* length of protocol addres */
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u_int16_t ar_op; /* operation type */
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#define ARPOP_REQUEST 1 /* req to resolve address */
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#define ARPOP_REPLY 2 /* resp to previous request */
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#define ARPOP_REVREQUEST 3 /* req protocol address given hardware */
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#define ARPOP_REVREPLY 4 /* resp giving protocol address */
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#define ARPOP_INVREQUEST 8 /* req to identify peer */
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#define ARPOP_INVREPLY 9 /* resp identifying peer */
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u_int8_t sender_mac[ETHER_ADDR_LEN];
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u_int8_t sender_ip[IP_ADDR_LEN];
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u_int8_t target_mac[ETHER_ADDR_LEN];
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u_int8_t target_ip[IP_ADDR_LEN];
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};
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/*
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* Ethernet II header
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* Static header size: 14 bytes
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*/
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struct ethernet_hdr
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{
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u_int8_t ether_dhost[ETHER_ADDR_LEN];/* destination ethernet address */
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u_int8_t ether_shost[ETHER_ADDR_LEN];/* source ethernet address */
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u_int16_t ether_type; /* protocol */
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};
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/**
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* IEEE 802.1Q (Virtual Local Area Network) VLAN header, static header
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* size: 18 bytes
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*/
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struct vlan_hdr
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{
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u_int8_t vlan_dhost[ETHER_ADDR_LEN]; /**< destination ethernet address */
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u_int8_t vlan_shost[ETHER_ADDR_LEN]; /**< source ethernet address */
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u_int16_t vlan_tpi; /**< tag protocol ID */
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u_int16_t vlan_priority_c_vid; /**< priority | VLAN ID */
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#define VLAN_PRIMASK 0x0007 /**< priority mask */
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#define VLAN_CFIMASK 0x0001 /**< CFI mask */
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#define VLAN_VIDMASK 0x0fff /**< vid mask */
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u_int16_t vlan_len; /**< length or type (802.3 / Eth 2) */
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};
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/*
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* IP header included from netinet/ip.h
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*/
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#include<netinet/ip.h>
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/*
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* ICMP header
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* Internet Control Message Protocol
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* Base header size: 4 bytes
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*/
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struct icmp_hdr
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{
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u_int8_t icmp_type; /* ICMP type */
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#define ICMP_ECHOREPLY 0
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#define ICMP_ECHO 8
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u_int8_t icmp_code; /* ICMP code */
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u_int16_t icmp_sum; /* ICMP Checksum */
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u_int16_t id; /* ICMP id */
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u_int16_t seq; /* ICMP sequence number */
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};
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/*
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* UDP header included from netinet/udp.h
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*/
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#include<netinet/udp.h>
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/*
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* DHCP header
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* Dynamic Host Configuration Protocol
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* Static header size: f0 bytes
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*/
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struct dhcpv4_hdr
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{
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u_int8_t dhcp_opcode; /* opcode */
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#define DHCP_REQUEST 0x1
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#define DHCP_REPLY 0x2
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u_int8_t dhcp_htype; /* hardware address type */
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u_int8_t dhcp_hlen; /* hardware address length */
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u_int8_t dhcp_hopcount; /* used by proxy servers */
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u_int32_t dhcp_xid; /* transaction ID */
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u_int16_t dhcp_secs; /* number of seconds since trying to bootstrap */
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u_int16_t dhcp_flags; /* flags for DHCP, unused for BOOTP */
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u_int32_t dhcp_cip; /* client's IP */
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u_int32_t dhcp_yip; /* your IP */
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u_int32_t dhcp_sip; /* server's IP */
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u_int32_t dhcp_gip; /* gateway IP */
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u_int8_t dhcp_chaddr[16]; /* client hardware address */
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u_int8_t dhcp_sname[64]; /* server host name */
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u_int8_t dhcp_file[128]; /* boot file name */
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u_int32_t dhcp_magic; /* BOOTP magic header */
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#define DHCP_MAGIC 0x63825363
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#define BOOTP_MIN_LEN 0x12c
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#define DHCP_PAD 0x00
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#define DHCP_SUBNETMASK 0x01
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#define DHCP_TIMEOFFSET 0x02
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#define DHCP_ROUTER 0x03
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#define DHCP_TIMESERVER 0x04
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#define DHCP_NAMESERVER 0x05
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#define DHCP_DNS 0x06
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#define DHCP_LOGSERV 0x07
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#define DHCP_COOKIESERV 0x08
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#define DHCP_LPRSERV 0x09
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#define DHCP_IMPSERV 0x0a
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#define DHCP_RESSERV 0x0b
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#define DHCP_HOSTNAME 0x0c
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#define DHCP_BOOTFILESIZE 0x0d
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#define DHCP_DUMPFILE 0x0e
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#define DHCP_DOMAINNAME 0x0f
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#define DHCP_SWAPSERV 0x10
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#define DHCP_ROOTPATH 0x11
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#define DHCP_EXTENPATH 0x12
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#define DHCP_IPFORWARD 0x13
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#define DHCP_SRCROUTE 0x14
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#define DHCP_POLICYFILTER 0x15
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#define DHCP_MAXASMSIZE 0x16
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#define DHCP_IPTTL 0x17
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#define DHCP_MTUTIMEOUT 0x18
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#define DHCP_MTUTABLE 0x19
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#define DHCP_MTUSIZE 0x1a
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#define DHCP_LOCALSUBNETS 0x1b
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#define DHCP_BROADCASTADDR 0x1c
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#define DHCP_DOMASKDISCOV 0x1d
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#define DHCP_MASKSUPPLY 0x1e
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#define DHCP_DOROUTEDISC 0x1f
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#define DHCP_ROUTERSOLICIT 0x20
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#define DHCP_STATICROUTE 0x21
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#define DHCP_TRAILERENCAP 0x22
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#define DHCP_ARPTIMEOUT 0x23
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#define DHCP_ETHERENCAP 0x24
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#define DHCP_TCPTTL 0x25
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#define DHCP_TCPKEEPALIVE 0x26
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#define DHCP_TCPALIVEGARBAGE 0x27
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#define DHCP_NISDOMAIN 0x28
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#define DHCP_NISSERVERS 0x29
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#define DHCP_NISTIMESERV 0x2a
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#define DHCP_VENDSPECIFIC 0x2b
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#define DHCP_NBNS 0x2c
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#define DHCP_NBDD 0x2d
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#define DHCP_NBTCPIP 0x2e
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#define DHCP_NBTCPSCOPE 0x2f
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#define DHCP_XFONT 0x30
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#define DHCP_XDISPLAYMGR 0x31
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#define DHCP_REQUESTEDIP 0x32
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#define DHCP_LEASETIME 0x33
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#define DHCP_OPTIONOVERLOAD 0x34
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#define DHCP_MESSAGETYPE 0x35
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#define DHCP_SERVIDENT 0x36
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#define DHCP_PARAMREQUEST 0x37
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#define DHCP_MESSAGE 0x38
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#define DHCP_MAXMSGSIZE 0x39
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#define DHCP_RENEWTIME 0x3a
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#define DHCP_REBINDTIME 0x3b
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#define DHCP_CLASSSID 0x3c
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#define DHCP_CLIENTID 0x3d
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#define DHCP_NISPLUSDOMAIN 0x40
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#define DHCP_NISPLUSSERVERS 0x41
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#define DHCP_MOBILEIPAGENT 0x44
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#define DHCP_SMTPSERVER 0x45
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#define DHCP_POP3SERVER 0x46
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#define DHCP_NNTPSERVER 0x47
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#define DHCP_WWWSERVER 0x48
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#define DHCP_FINGERSERVER 0x49
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#define DHCP_IRCSERVER 0x4a
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#define DHCP_STSERVER 0x4b
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#define DHCP_STDASERVER 0x4c
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#define DHCP_FQDN 0x51
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#define DHCP_END 0xff
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#define DHCP_MSGDISCOVER 0x01
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#define DHCP_MSGOFFER 0x02
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#define DHCP_MSGREQUEST 0x03
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#define DHCP_MSGDECLINE 0x04
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#define DHCP_MSGACK 0x05
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#define DHCP_MSGNACK 0x06
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#define DHCP_MSGRELEASE 0x07
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#define DHCP_MSGINFORM 0x08
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};
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#ifndef ETHERTYPE_IP
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#define ETHERTYPE_IP 0x0800 /* IP protocol */
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#endif
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#ifndef ETHERTYPE_VLAN
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#define ETHERTYPE_VLAN 0x8100 /* IEEE 802.1Q VLAN tagging */
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#endif
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#define ETHERTYPE_ARP 0x806
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#define SOCKET_ERR -1
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#define PACK_SEND_ERR -1
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#define PACK_RECV_ERR -2
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#define DHCP_OFFR_RCVD 1
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#define DHCP_DISC_RESEND 2
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#define UNKNOWN_PACKET 3
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#define DHCP_ACK_RCVD 4
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#define DHCP_REQ_RESEND 5
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#define DHCP_NAK_RCVD 6
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#define ERR_FILE_OPEN 7
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#define ARP_ICMP_RCV 8
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#define ARP_RCVD 9
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#define ARP_MAP 10
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#define ICMP_MAP 11
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#define ICMP_RCVD 12
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#define ARP_SEND 13
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#define ICMP_SEND 14
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#define LISTEN_TIMOUET 15
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/*
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* FQDN options flags
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*/
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#define FQDN_N_FLAG 0x08
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#define FQDN_E_FLAG 0x04
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#define FQDN_O_FLAG 0x02
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#define FQDN_S_FLAG 0x01a
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/*
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* Minimum DHCP packet size
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*/
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#define MINIMUM_PACKET_SIZE 300
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#endif /* __HEADERS_H */
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/* EOF */
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