libnet-functions.h

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/*
 *  $Id: libnet-functions.h,v 1.1 2001/08/07 13:15:12 fygrave Exp $
 *
 *  libnet-functions.h - Network routine library function prototype header file
 *
 *  Copyright (c) 1998, 1999, 2000 Mike D. Schiffman <[e-mail]>
 *  All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#ifndef __LIBNET_FUNCTIONS_H
#define __LIBNET_FUNCTIONS_H


int                                     /* 1 if good, -1 if bad */
libnet_plist_chain_new(
    struct libnet_plist_chain **,       /* pointer to the head of the list */
    char *                              /* token list pointer */
    );


int                                     /* 1 if more nodes, 0 if not */
libnet_plist_chain_next_pair(
    struct libnet_plist_chain *,        /* pointer to the head of the list */
    u_short *bport,                     /* holds bport */
    u_short *eport                      /* holds eport */
    );


int
libnet_plist_chain_dump(
    struct libnet_plist_chain *         /* pointer to the head of the list */
    );


u_char *
libnet_plist_chain_dump_string(
    struct libnet_plist_chain *         /* pointer to the head of the list */
    );


int
libnet_plist_chain_free(
    struct libnet_plist_chain *         /* pointer to the head of the list */
    );

/*
 *  Standard error handling code.
 */

void
libnet_error(
    int,                /* severity */
    char *,             /* error message */
    ...                 /* varargs */
    );


/*
 *  Seeds the pseudorandom number generator with gettimeofday.
 */

int
libnet_seed_prand();


/*
 *  Returns a psuedorandom positive integer.
 */

u_long
libnet_get_prand(
    int                 /* One of the PR* constants */
    );


/*
 *  Calculates IPv4 family checksum on packet headers.
 */

int                     /* 1 on success, -1 on failure */
libnet_do_checksum(
    u_char *,           /* Pointer to the packet buffer */
    int,                /* Protocol */
    int                 /* Packet size */
    );


/*
 *  Network byte order into IP address
 *  Previous versions had a memory leak (returned a strdup'd pointer -- strdup
 *  has an implicit malloc which wasn't getting freed).  This static var hack
 *  thingy was used to preserve existing code without having to change much.
 *  You can simply use the return value of the function directly allowing you
 *  to write tighter, more obvious code (rather then having to do allocate an
 *  additional buffer for the output).
 *  Thanks to Red for the idea.
 */

u_char *                /* Pointer to hostname or dotted decimal IP address */
libnet_host_lookup(
    u_long,             /* Network byte ordered (big endian) IP address */
    u_short             /* Use domain names or no */
    );


/*
 *  Network byte order into IP address
 *  Threadsafe version.
 */

void
libnet_host_lookup_r(
    u_long,             /* Network byte ordered (big endian) IP address */
    u_short,            /* Use domain names or no */
    u_char *            /* Pointer to hostname or dotted decimal IP address */
    );


/*
 *  IP address into network byte order
 */

u_long                  /* Network byte ordered IP address or -1 on error */
libnet_name_resolve(
    u_char *,           /* Pointer the hostname or dotted decimal IP address */
    u_short             /* Use domain names or no */
    );


/*
 *  IP checksum wrapper.
 */

u_short                 /* Standard IP checksum of header and data */
libnet_ip_check(
    u_short *,          /* Pointer to the buffer to be summed */
    int                 /* Packet length */
    );


/*
 *  IP checksum.
 */

int                     /* Standard IP checksum */
libnet_in_cksum(
    u_short *,          /* Pointer to the buffer to be summed */
    int                 /* Packet length */
    );


/*
 *  Opens a socket for writing raw IP datagrams to.  Set IP_HDRINCL to let the 
 *  kernel know we've got it all under control.
 */

int                     /* Opened file desciptor, or -1 on error */
libnet_open_raw_sock(
    int                 /* Protocol of raw socket (from /etc/protocols) */
    );


int                     /* 1 upon success, or -1 on error */
libnet_close_raw_sock(
    int                 /* File descriptor */
    );


int
libnet_select_device(
    struct sockaddr_in *sin,
    u_char **device,
    u_char *ebuf
    );

/*
 *  Ethernet packet assembler.
 */

int                     /* -1 on failure (null buf passed in), 1 on success */
libnet_build_ethernet(
    u_char *,           /* Pointer to a 6 byte ethernet address */
    u_char *,           /* Pointer to a 6 byte ethernet address */
    u_short,            /* Packet IP type */
    const u_char *,     /* Payload (or NULL) */
    int,                /* Payload size */
    u_char *            /* Packet header buffer */
    );


/*
 *  ARP packet assembler.
 */

int                     /* -1 on failure (null buf passed in), 1 on success */
libnet_build_arp(
    u_short,            /* hardware address type */
    u_short,            /* protocol address type */
    u_char,             /* hardware address length */
    u_char,             /* protocol address length */
    u_short,            /* ARP operation type */
    u_char *,           /* sender hardware address */
    u_char *,           /* sender protocol address */
    u_char *,           /* target hardware address */
    u_char *,           /* target protocol address */
    const u_char *,     /* payload or NULL if none */
    int,                /* payload length */
    u_char *            /* packet buffer memory */
    );

/*
 *  TCP packet assembler.
 */

int                     /* -1 on failure (null buf passed in), 1 on success */
libnet_build_tcp(
    u_short,            /* Source port */
    u_short,            /* Destination port */
    u_long,             /* Sequence Number */
    u_long,             /* Acknowledgement Number */
    u_char,             /* Control bits */
    u_short,            /* Advertised Window Size */
    u_short,            /* Urgent Pointer */
    const u_char *,     /* Pointer to packet data (or NULL) */
    int,                /* Packet payload size */
    u_char *            /* Pointer to packet header memory */
    );


/*
 * UDP packet assembler.
 */

int                     /* -1 on failure (null buf passed in), 1 on success */
libnet_build_udp(
    u_short,            /* Source port */
    u_short,            /* Destination port */
    const u_char *,     /* Pointer to packet data (or NULL) */
    int,                /* Packet payload size */
    u_char *            /* Pointer to packet header memory */
    );

/*
 *  ICMP_ECHO packet assembler.
 */

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

/*
 *  ICMP_MASK packet assembler.
 */

int                     /* -1 on failure (null buf passed in), 1 on success */
libnet_build_icmp_mask(
    u_char,             /* icmp type */
    u_char,             /* icmp code */
    u_short,            /* id */
    u_short,            /* sequence number */
    u_long,             /* address mask */
    const u_char *,     /* Pointer to packet data (or NULL) */
    int,                /* Packet payload size */
    u_char *            /* Pointer to packet header memory */
    );


/*
 *  ICMP_UNREACH packet assembler.
 */

int                     /* -1 on failure (null buf passed in), 1 on success */
libnet_build_icmp_unreach(
    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 */