libnet-functions.h

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    u_long,             /* Original Destination IP Address */
    const u_char *,     /* Pointer to original packet data (or NULL) */
    int,                /* Packet payload size (or 0) */
    u_char *            /* Pointer to packet header memory */
    );

/*
 *  ICMP_REDIRECT packet assembler.
 */

int                     /* -1 on failure (null buf passed in), 1 on success */
libnet_build_icmp_redirect(
    u_char,             /* icmp type */
    u_char,             /* icmp code */
    u_long,             /* Gateway host that should be used */
    u_short,            /* Original Length of packet data */
    u_char,             /* Original IP tos */
    u_short,            /* Original IP ID */
    u_short,            /* Original Fragmentation flags and offset */
    u_char,             /* Original TTL */
    u_char,             /* Original Protocol */
    u_long,             /* Original Source IP Address */
    u_long,             /* Original Destination IP Address */
    const u_char *,     /* Pointer to original packet data (or NULL) */
    int,                /* Packet payload size (or 0) */
    u_char *            /* Pointer to packet header memory */
    );


/*
 *  ICMP_TIMXCEED packet assembler.
 */

int                     /* -1 on failure (null buf passed in), 1 on success */
libnet_build_icmp_timeexceed(
    u_char,             /* icmp type */
    u_char,             /* icmp code */
    u_short,            /* Original Length of packet data */
    u_char,             /* Original IP tos */
    u_short,            /* Original IP ID */
    u_short,            /* Original Fragmentation flags and offset */
    u_char,             /* Original TTL */
    u_char,             /* Original Protocol */
    u_long,             /* Original Source IP Address */
    u_long,             /* Original Destination IP Address */
    const u_char *,     /* Pointer to original packet data (or NULL) */
    int,                /* Packet payload size (or 0) */
    u_char *            /* Pointer to packet header memory */
    );

/*
 *  ICMP_TIMESTAMP packet assembler.
 */

int                     /* -1 on failure (null buf passed in), 1 on success */
libnet_build_icmp_timestamp(
    u_char,             /* icmp type */
    u_char,             /* icmp code */
    u_short,            /* id */
    u_short,            /* sequence number */
    n_time,             /* original timestamp */
    n_time,             /* receive timestamp */
    n_time,             /* transmit timestamp */
    const u_char *,     /* Pointer to packet data (or NULL) */
    int,                /* Packet payload size */
    u_char *            /* Pointer to packet header memory */
    );

/*
 *  IGMP packet assembler.
 */

int                     /* -1 on failure (null buf passed in), 1 on success */
libnet_build_igmp(
    u_char,             /* igmp type */
    u_char,             /* igmp code */
    u_long,             /* ip addr */
    const u_char *,     /* Pointer to packet data (or NULL) */
    int,                /* Packet payload size */
    u_char *            /* Pointer to packet header memory */
    );


/*
 *  IP packet assembler.
 */

int                     /* -1 on failure (null buf passed in), 1 on success */
libnet_build_ip(
    u_short,            /* Length of packet data */
    u_char,             /* IP tos */
    u_short,            /* IP ID */
    u_short,            /* Fragmentation flags and offset */
    u_char,             /* TTL */
    u_char,             /* Protocol */
    u_long,             /* Source IP Address */
    u_long,             /* Destination IP Address */
    const u_char *,     /* Pointer to packet data (or NULL) */
    int,                /* Packet payload size */
    u_char *            /* Pointer to packet header memory */
    );


/*
 *  DNS pacekt assembler.
 */

int                     /* -1 on failure (null buf passed in), 1 on success */
libnet_build_dns(
    u_short,            /* Packet ID */
    u_short,            /* Flags */
    u_short,            /* Number of questions */
    u_short,            /* Number of answer resource records */
    u_short,            /* Number of authority resource records */
    u_short,            /* Number of additional resource records */
    const u_char *,     /* Payload (or NULL) */
    int,                /* Payload size */
    u_char *            /* Header memory */
    );


/*
 *  RIP packet assembler.
 */

int                     /* -1 on failure (null buf passed in), 1 on success */
libnet_build_rip(
    u_char,             /* Command */
    u_char,             /* Version */
    u_short,            /* Zero (v1) or Routing Domain (v2) */
    u_short,            /* Address family */
    u_short,            /* Zero (v1) or Route Tag (v2) */
    u_long,             /* IP address */
    u_long,             /* Zero (v1) or Subnet Mask (v2) */
    u_long,             /* Zero (v1) or Next hop IP address (v2) */
    u_long,             /* Metric */
    const u_char *,     /* Payload (or NULL) */
    int,                /* Payload size */
    u_char *            /* Header memory */
    );


/*
 *  Insert IP options to a prebuilt IP packet.
 */

int                     /* 1 on success, -1 on failure */
libnet_insert_ipo(
    struct ipoption *,  /* Pointer to the ip options structure */ 
    u_char,             /* IP option list size */
    u_char *            /* Pointer to packet buf */
    );

/*
 *  Insert TCP options to a prebuilt IP packet.
 */

int                     /* 1 on success, -1 on failure */
libnet_insert_tcpo(
    struct tcpoption *, /* Pointer to the tcp options structure */ 
    u_char,             /* TCP option list size */
    u_char *            /* Pointer to packet buf */
    );

/*
 *  Writes a prebuild IP packet to the network with a supplied raw socket.
 *  To write a link layer packet, use the write_link_layer function.
 */

int                     /* number of bytes written if successful, -1 on error */
libnet_write_ip(
    int sock,           /* Previously opened raw socket */
    u_char *,           /* Pointer a complete IP datagram */
    int                 /* Packet size */
    );

/*
 *  Writes a prebuild IP/ethernet packet to the network with a supplied
 *  link_layer interface.  To write just an IP packet, use the write_link_layer
 *  function.
 */

int                     /* number of bytes written if successful, -1 on error */
libnet_write_link_layer(
    struct libnet_link_int *,  /* Pointer to a link interface structure */
    const u_char *,     /* Pointer to the device */
    u_char *,           /* Pointer the u_char buf (the packet)to be written */
    int                 /* Packet length */
    );


/*
 *  Opens a link layer interface.  Analogous to open_raw_sock.
 */

struct libnet_link_int *       /* Pointer to a link layer interface struct */
libnet_open_link_interface(
    char *,             /* Device name */
    char *              /* Error buffer */
    );


int                     /* 1 on success, -1 on failure */
libnet_close_link_interface(
    struct libnet_link_int *   /* Pointer to a link layer interface struct */
    );


char *                  /* String error message */
ll_strerror(
    int                 /* Errno */
    );


/*
 *  Returns the IP address of the interface.
 */

u_long                  /* 0 upon error, address upon success */
libnet_get_ipaddr(
    struct libnet_link_int *,  /* Pointer to a link interface structure */
    const u_char *,     /* Device */
    char *              /* Error buf */
    );


/*
 *  Returns the MAC address of the interface.
 */

struct ether_addr *     /* 0 upon error, address upon success */
libnet_get_hwaddr(
    struct libnet_link_int *,  /* Pointer to a link interface structure */
    const u_char *,     /* Device */
    char *              /* Error buf */
    );


/*
 *  Simple interface for initializing a packet.
 *  Basically a malloc wrapper.  
 */

int                     /* -1 on error, 1 on ok */
libnet_init_packet(
    int,                /* 0 and we make a good guess, otherwise you choose. */
    u_char **           /* Pointer to the pointer to the packet */
    );      


/*
 *  Simple interface for destoying a packet.
 *  Don't call this without a corresponding call to init_packet() first.
 */

int                         /* -1 if arena is NULL, 1 if ok */
libnet_destroy_packet(
    u_char **               /* Pointer to the packet addr. */
    );


/*
 *  Memory pool initialization routine.
 */

int
libnet_init_packet_arena(
    struct libnet_arena **, /* Pointer to an arena pointer */
    int,                /* 0 and we make a good guess, otherwise you choose. */
    u_short
    );


/*
 *  Returns the next chunk of memory from the pool.
 */

u_char *
libnet_next_packet_from_arena(
    struct libnet_arena **, /* Pointer to an arena pointer */
    int                 /* 0 and we make a good guess, otherwise you choose. */
    );


/*
 *  Memory pool destructor routine.
 */

int                         /* -1 if arena is NULL, 1 if ok */
libnet_destroy_packet_arena(
    struct libnet_arena **  /* Pointer to an arena pointer */
    );


/* 
 *  More or less taken from tcpdump code.
 */

void
libnet_hex_dump(
    u_char *,               /* Packet to be dumped */
    int,                    /* Packet size (in bytes */
    int,                    /* To swap or not to swap */
    FILE *                  /* Stream pointer to dump to */
    );


#endif  /* __LIBNET_FUNCTIONS_H */

/* EOF */