Annotation of embedaddon/libnet/src/libnet_build_arp.c, revision 1.1.1.3
1.1 misho 1: /*
1.1.1.2 misho 2: * $Id: libnet_build_arp.c,v 1.13 2004/04/13 17:32:28 mike Exp $
1.1 misho 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:
1.1.1.3 ! misho 33: #include "common.h"
1.1 misho 34:
35:
36: libnet_ptag_t
1.1.1.2 misho 37: libnet_build_arp(uint16_t hrd, uint16_t pro, uint8_t hln, uint8_t pln,
38: uint16_t op, const uint8_t *sha, const uint8_t *spa, const uint8_t *tha, const uint8_t *tpa,
39: const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
1.1 misho 40: {
1.1.1.2 misho 41: uint32_t n, h;
1.1 misho 42: libnet_pblock_t *p;
43: struct libnet_arp_hdr arp_hdr;
44:
45: if (l == NULL)
46: {
47: return (-1);
48: }
49:
50: n = LIBNET_ARP_H + (2 * hln) + (2 * pln) + payload_s;
51: h = 0; /* ARP headers have no checksum */
52:
53: /*
54: * Find the existing protocol block if a ptag is specified, or create
55: * a new one.
56: */
57: p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ARP_H);
58: if (p == NULL)
59: {
60: return (-1);
61: }
62:
63: memset(&arp_hdr, 0, sizeof(arp_hdr));
64: arp_hdr.ar_hrd = htons(hrd); /* hardware address type */
65: arp_hdr.ar_pro = htons(pro); /* protocol address type */
66: arp_hdr.ar_hln = hln; /* hardware address length */
67: arp_hdr.ar_pln = pln; /* protocol address length */
68: arp_hdr.ar_op = htons(op); /* opcode command */
69:
1.1.1.2 misho 70: n = libnet_pblock_append(l, p, (uint8_t *)&arp_hdr, LIBNET_ARP_H);
1.1 misho 71: if (n == -1)
72: {
73: /* err msg set in libnet_pblock_append() */
74: goto bad;
75: }
76: n = libnet_pblock_append(l, p, sha, hln);
77: if (n == -1)
78: {
79: /* err msg set in libnet_pblock_append() */
80: goto bad;
81: }
82: n = libnet_pblock_append(l, p, spa, pln);
83: if (n == -1)
84: {
85: /* err msg set in libnet_pblock_append() */
86: goto bad;
87: }
88: n = libnet_pblock_append(l, p, tha, hln);
89: if (n == -1)
90: {
91: /* err msg set in libnet_pblock_append() */
92: goto bad;
93: }
94: n = libnet_pblock_append(l, p, tpa, pln);
95: if (n == -1)
96: {
97: /* err msg set in libnet_pblock_append() */
98: goto bad;
99: }
100:
1.1.1.2 misho 101: /* boilerplate payload sanity check / append macro */
102: LIBNET_DO_PAYLOAD(l, p);
1.1 misho 103:
104: return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_ARP_H));
105: bad:
106: libnet_pblock_delete(l, p);
107: return (-1);
108: }
109:
110: libnet_ptag_t
1.1.1.2 misho 111: libnet_autobuild_arp(uint16_t op, const uint8_t *sha, const uint8_t *spa, const uint8_t *tha,
1.1.1.3 ! misho 112: const uint8_t *tpa, libnet_t *l)
1.1 misho 113: {
114: u_short hrd;
115:
116: switch (l->link_type)
117: {
118: case 1: /* DLT_EN10MB */
119: hrd = ARPHRD_ETHER;
120: break;
121: case 6: /* DLT_IEEE802 */
122: hrd = ARPHRD_IEEE802;
123: break;
124: default:
125: hrd = 0;
126: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
1.1.1.3 ! misho 127: "%s(): unsupported link type", __func__);
1.1 misho 128: return (-1);
129: /* add other link-layers */
130: }
131:
132: return (libnet_build_arp(
133: hrd, /* hardware addr */
134: ETHERTYPE_IP, /* protocol addr */
135: 6, /* hardware addr size */
136: 4, /* protocol addr size */
137: op, /* operation type */
138: sha, /* sender hardware addr */
1.1.1.2 misho 139: spa, /* sender protocol addr */
1.1 misho 140: tha, /* target hardware addr */
1.1.1.2 misho 141: tpa, /* target protocol addr */
1.1 misho 142: NULL, /* payload */
143: 0, /* payload size */
144: l, /* libnet context */
145: 0)); /* libnet id */
146: }
147:
1.1.1.3 ! misho 148: /**
! 149: * Local Variables:
! 150: * indent-tabs-mode: nil
! 151: * c-file-style: "stroustrup"
! 152: * End:
! 153: */
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