/* $Header: /cvsroot/dhcp-agent/dhcp-agent/src/dhcp-librawnet.h,v 1.21 2003/07/05 19:18:17 actmodern Exp $ * * Copyright 2002 Thamer Alharbash * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. The names of the authors may not be used to endorse or promote * products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * */#ifndef DHCP_LIBRAWNET_H#define DHCP_LIBRAWNET_H/* type definitions. */typedef uint8_t    dhcp_opt_tag_t;typedef size_t     dhcp_opt_len_t;typedef uint16_t   dhcp_opt_type_t;typedef uint16_t   dhcp_opt_val_type_t;/* forward declare dhcp_opt to typedef function pointers below. */struct dhcp_opt;/* typedef of dhcp option function pointers. *//* converters from external data to internal */typedef int (*dhcp_opt_from_string)(struct dhcp_opt *opt, const char *input);typedef int (*dhcp_opt_from_user_string)(struct dhcp_opt *opt, list_t *input_list);typedef int (*dhcp_opt_from_network)(struct dhcp_opt *opt, const uint8_t *data, size_t len);/* converts from internal data to other data formats. */typedef void *(*dhcp_opt_to_network_data)(struct dhcp_opt *opt);typedef void *(*dhcp_opt_to_host_data)(struct dhcp_opt *opt);typedef char *(*dhcp_opt_to_user_string)(struct dhcp_opt *opt);typedef char *(*dhcp_opt_to_string)(struct dhcp_opt *opt);/* data structures. *//* interface control object: * we store dnet's interface handle,  * and interface_entry structure.  * We need the entry structure */typedef struct {    intf_t *interface_handle;    struct intf_entry *interface_entry;} interface_control_t;/* DHCP fixed header -- before dhcp options. *//* Size of header independant of any padding * sizeof() the structure may return. */#define DHCP_FIXEDHDR_LEN 236typedef struct {    uint8_t op;    uint8_t htype;    uint8_t hlen;    uint8_t hops;    uint32_t xid;    uint16_t secs;    uint16_t flags;    uint32_t ciaddr;    uint32_t yiaddr;    uint32_t siaddr;    uint32_t giaddr;#define DHCP_CHADDR_SIZE 16    unsigned char chaddr[DHCP_CHADDR_SIZE];#define DHCP_SNAME_SIZE 64    unsigned char sname[DHCP_SNAME_SIZE];#define DHCP_FILE_SIZE 128    unsigned char file[DHCP_FILE_SIZE];    /* options go here. */} dhcphdr;/* the data destructor. */typedef void (*dhcp_opt_data_destroy)(struct dhcp_opt *opt);typedef struct dhcp_opt_attr {    dhcp_opt_tag_t      tag;         /* tag                     */    dhcp_opt_len_t      len;         /* member length in octets */    dhcp_opt_val_type_t type;        /* type of opt             */    dhcp_opt_val_type_t val_type;    /* type of val             */    /* data extraction routines. */    dhcp_opt_to_network_data    to_network_data;          /* to network data representation. */    dhcp_opt_to_user_string     to_user_string;           /* to user string representation. */    dhcp_opt_to_string          to_internal_string;       /* to internal string representation. */    /* data creation routines. */    dhcp_opt_from_network       from_network;                /* network data to internal. */    dhcp_opt_from_user_string   from_user_string;            /* user string to internal.  */    dhcp_opt_from_string        from_internal_string;        /* string to internal.       */    dhcp_opt_data_destroy                 destroy;           /* destroy option datum. */} dhcp_opt_attr_t;/* the dhcp option object. */typedef struct dhcp_opt {    void *val;                       /* value        */    size_t num;                      /* num          */    dhcp_opt_attr_t *opt_attr;       /* attributes   */} dhcp_opt_t;/* DHCP object * * for packet assembly/disassembly. */typedef struct {    dhcphdr fixedheader;        /* DHCP fixed header. */    uint32_t magic_cookie;      /* Magic cookie. */    list_t *options;            /* Option list. */} dhcp_obj;/*  * Other packet objects. *  * We use these to create a single interface * for creating custom packeting. *  */typedef struct {    struct eth_hdr header;} eth_obj;typedef struct {    struct ip_hdr header;} ip_obj;typedef struct {    struct arp_hdr header;    struct arp_ethip arp_data;} arp_obj;typedef struct {    struct icmp_hdr icmp_header;    union icmp_msg icmp_msg;} icmp_obj;typedef struct {    struct udp_hdr header;} udp_obj;/*  * DHCP raw network object. *  * We do all our network transmission * through this data structure. *  */typedef struct {    /* we should not interface directly with any of these members     * above the rawnet layer: FIXME -- unfortunately we do. */    pcap_t *pcap;               /* packet capturing device (pcap). */    int pcap_fd;                /* file descriptor we can select on for pcap. */    eth_t *eth;                 /* ethernet device handler (libdnet). */    uint16_t src_port, dst_port; /* udp ports for writing packets. */    char *device;               /* device name. */    char *packet_data;          /* packet data. */    int packet_len;             /* total length of packet. */    struct timeval tstamp;      /* timestamp. */    eth_addr_t chw_addr;        /* our hardware address. */    ip_addr_t cip_addr;         /* our ip address. */    eth_addr_t *fake_hw_addr;   /* our fake hardware address. */    int promiscuous;            /* run in promiscuous mode flag. */    int mtu;                    /* mtu setting. */    interface_control_t    *intf_handle;               /* interface control handle. */    /*      * Data objects     *      * After reception of packets on the wire     * they're aligned and placed into these     * objects.     *      */    uint8_t type;               /* Type of data:                                 * ARP, ICMP DHCP */    char *pcap_filter;          /* low level pcap filter. */    /* Packet data. */    eth_obj *ether_p;    ip_obj *ip_p;    arp_obj *arp_p;    icmp_obj *icmp_p;    udp_obj *udp_p;    dhcp_obj *dhcp_p;} rawnet_t;/* constants. *//* Reasonable defaults in case services db isn't up to date. */#define BOOTP_CLIENT 68#define BOOTP_SERVER 67/* Raw net types for packets. */#define RAWNET_UNKNOWN 0#define RAWNET_ARP 1#define RAWNET_ICMP 2#define RAWNET_DHCP 3/* Raw net return types when * receiving packets. */#define RAWNET_OK 0#define RAWNET_PCAP_ERROR -1#define RAWNET_ERROR -2 /* generic error. */#define RAWNET_MALFORMED_PACKET -3#define RAWNET_UNHANDLED -4#define RAWNET_TIMEOUT -5#define RAWNET_USER_INTERRUPT -6/* DHCP Type messages */# define DHCP_DISCOVER_TM 1# define DHCP_OFFER_TM    2# define DHCP_REQUEST_TM  3# define DHCP_DECLINE_TM  4# define DHCP_DHCPACK_TM  5# define DHCP_DHCPNAK_TM  6# define DHCP_RELEASE_TM  7/* BOOTP Types */#define DHCP_BOOTP_REQUEST 1#define DHCP_BOOTP_REPLY 2/* Flags */#define DHCP_BROADCAST_FLAG 0x8000/* Option tags. *//* (this is me trying to make constant names out of long option * names. let the comedy ensue!) */# define TAG_DHCP_PAD                           0# define TAG_DHCP_SUBNET_MASK                   1# define TAG_DHCP_TIME_OFFSET                   2# define TAG_DHCP_ROUTER                        3# define TAG_DHCP_TIME_SERVER                   4# define TAG_DHCP_NAME_SERVER                   5# define TAG_DHCP_DOMAIN_NAME_SERVER            6# define TAG_DHCP_LOG_SERVER                    7# define TAG_DHCP_COOKIE_SERVER                 8# define TAG_DHCP_LPR_SERVER                    9# define TAG_DHCP_IMPRESS_SERVER               10# define TAG_DHCP_RESOURCE_LOCATION_SERVER     11# define TAG_DHCP_HOST_NAME                    12# define TAG_DHCP_BOOT_FILE_SIZE               13# define TAG_DHCP_MERIT_DUMP_FILE              14# define TAG_DHCP_DOMAIN_NAME                  15# define TAG_DHCP_SWAP_SERVER                  16# define TAG_DHCP_ROOT_PATH                    17# define TAG_DHCP_EXTENSIONS_PATH              18# define TAG_DHCP_IP_FORWARDING                19# define TAG_DHCP_NON_LOCAL_SOURCE_ROUTING     20# define TAG_DHCP_POLICY_FILTER                21# define TAG_DHCP_MAX_DGRAM_REASSUMBLY_SIZE    22# define TAG_DHCP_IP_TIME_TO_LIVE              23# define TAG_DHCP_MTU_AGING_TIMEOUT            24# define TAG_DHCP_MTU_PLATEAU_TABLE            25# define TAG_DHCP_INTERFACE_MTU                26