1: /*
2: * $Id: libnet_build_arp.c,v 1.1.1.1 2012/02/21 22:14:23 misho Exp $
3: *
4: * libnet
5: * libnet_build_arp.c - ARP packet assembler
6: *
7: * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
8: * All rights reserved.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
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.
18: *
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
29: * SUCH DAMAGE.
30: *
31: */
32:
33: #if (HAVE_CONFIG_H)
34: #include "../include/config.h"
35: #endif
36: #if (!(_WIN32) || (__CYGWIN__))
37: #include "../include/libnet.h"
38: #else
39: #include "../include/win32/libnet.h"
40: #endif
41:
42:
43: libnet_ptag_t
44: libnet_build_arp(u_int16_t hrd, u_int16_t pro, u_int8_t hln, u_int8_t pln,
45: u_int16_t op, u_int8_t *sha, u_int8_t *spa, u_int8_t *tha, u_int8_t *tpa,
46: u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
47: {
48: u_int32_t n, h;
49: libnet_pblock_t *p;
50: struct libnet_arp_hdr arp_hdr;
51:
52: if (l == NULL)
53: {
54: return (-1);
55: }
56:
57: n = LIBNET_ARP_H + (2 * hln) + (2 * pln) + payload_s;
58: h = 0; /* ARP headers have no checksum */
59:
60: /*
61: * Find the existing protocol block if a ptag is specified, or create
62: * a new one.
63: */
64: p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ARP_H);
65: if (p == NULL)
66: {
67: return (-1);
68: }
69:
70: memset(&arp_hdr, 0, sizeof(arp_hdr));
71: arp_hdr.ar_hrd = htons(hrd); /* hardware address type */
72: arp_hdr.ar_pro = htons(pro); /* protocol address type */
73: arp_hdr.ar_hln = hln; /* hardware address length */
74: arp_hdr.ar_pln = pln; /* protocol address length */
75: arp_hdr.ar_op = htons(op); /* opcode command */
76:
77: n = libnet_pblock_append(l, p, (u_int8_t *)&arp_hdr, LIBNET_ARP_H);
78: if (n == -1)
79: {
80: /* err msg set in libnet_pblock_append() */
81: goto bad;
82: }
83: n = libnet_pblock_append(l, p, sha, hln);
84: if (n == -1)
85: {
86: /* err msg set in libnet_pblock_append() */
87: goto bad;
88: }
89: n = libnet_pblock_append(l, p, spa, pln);
90: if (n == -1)
91: {
92: /* err msg set in libnet_pblock_append() */
93: goto bad;
94: }
95: n = libnet_pblock_append(l, p, tha, hln);
96: if (n == -1)
97: {
98: /* err msg set in libnet_pblock_append() */
99: goto bad;
100: }
101: n = libnet_pblock_append(l, p, tpa, pln);
102: if (n == -1)
103: {
104: /* err msg set in libnet_pblock_append() */
105: goto bad;
106: }
107:
108: if ((payload && !payload_s) || (!payload && payload_s))
109: {
110: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
111: "%s(): payload inconsistency\n", __func__);
112: goto bad;
113: }
114:
115: if (payload && payload_s)
116: {
117: n = libnet_pblock_append(l, p, payload, payload_s);
118: if (n == -1)
119: {
120: /* err msg set in libnet_pblock_append() */
121: goto bad;
122: }
123: }
124:
125: return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_ARP_H));
126: bad:
127: libnet_pblock_delete(l, p);
128: return (-1);
129: }
130:
131: libnet_ptag_t
132: libnet_autobuild_arp(u_int16_t op, u_int8_t *sha, u_int8_t *spa, u_int8_t *tha,
133: u_int8_t *tpa, libnet_t *l)
134: {
135: u_short hrd;
136:
137: switch (l->link_type)
138: {
139: case 1: /* DLT_EN10MB */
140: hrd = ARPHRD_ETHER;
141: break;
142: case 6: /* DLT_IEEE802 */
143: hrd = ARPHRD_IEEE802;
144: break;
145: default:
146: hrd = 0;
147: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
148: "%s(): unsupported link type\n", __func__);
149: return (-1);
150: /* add other link-layers */
151: }
152:
153: return (libnet_build_arp(
154: hrd, /* hardware addr */
155: ETHERTYPE_IP, /* protocol addr */
156: 6, /* hardware addr size */
157: 4, /* protocol addr size */
158: op, /* operation type */
159: sha, /* sender hardware addr */
160: spa, /* sender protocol addr */
161: tha, /* target hardware addr */
162: tpa, /* target protocol addr */
163: NULL, /* payload */
164: 0, /* payload size */
165: l, /* libnet context */
166: 0)); /* libnet id */
167: }
168:
169: /* EOF */
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