2 * $Id: libnet_build_ip.c,v 1.1.1.1 2000/05/25 00:28:49 route Exp $
5 * libnet_build_ip.c - IP packet assembler
7 * Copyright (c) 1998 - 2001 Mike D. Schiffman <mike@infonexus.com>
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "../include/config.h"
36 #include "../include/libnet.h"
40 libnet_build_ipv4(u_short len, u_char tos, u_short id, u_short frag,
41 u_char ttl, u_char prot, u_long src, u_long dst,
42 const u_char *payload, int payload_s, u_char *buf)
44 return (libnet_build_ip(len, tos, id, frag, ttl, prot, src, dst, payload,
50 libnet_build_ip(u_short len, u_char tos, u_short id, u_short frag, u_char ttl,
51 u_char prot, u_long src, u_long dst, const u_char *payload,
52 int payload_s, u_char *buf)
54 struct libnet_ip_hdr ip_hdr;
61 ip_hdr.ip_v = 4; /* version 4 */
62 ip_hdr.ip_hl = 5; /* 20 byte header */
63 ip_hdr.ip_tos = tos; /* IP tos */
64 ip_hdr.ip_len = htons(LIBNET_IP_H + len); /* total length */
65 ip_hdr.ip_id = htons(id); /* IP ID */
66 ip_hdr.ip_off = htons(frag); /* fragmentation flags */
67 ip_hdr.ip_ttl = ttl; /* time to live */
68 ip_hdr.ip_p = prot; /* transport protocol */
69 ip_hdr.ip_sum = 0; /* do this later */
70 ip_hdr.ip_src.s_addr = src;
71 ip_hdr.ip_dst.s_addr = dst;
72 if (payload && payload_s)
75 * Unchecked runtime error for buf + IP_H + payload to be greater than
76 * the allocated heap memory.
78 memcpy(buf + LIBNET_IP_H, payload, payload_s);
80 memcpy((u_char *)buf, (u_char *)&ip_hdr, sizeof(ip_hdr));