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1 | /* |
2 | * $Id: libnet_build_ethernet.c,v 1.19 2005/11/29 22:50:14 carlosc Exp $ | |
3 | * | |
4 | * libnet | |
5 | * libnet_build_ethernet.c - ethernet 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 | libnet_ptag_t | |
43 | libnet_build_ethernet(u_int8_t *dst, u_int8_t *src, u_int16_t type, u_int8_t *payload, | |
44 | u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag) | |
45 | { | |
46 | u_int32_t n, h; | |
47 | libnet_pblock_t *p; | |
48 | struct libnet_ethernet_hdr eth_hdr; | |
49 | ||
50 | if (l == NULL) | |
51 | { | |
52 | return (-1); | |
53 | } | |
54 | ||
55 | /* sanity check injection type if we're not in advanced mode */ | |
56 | if (l->injection_type != LIBNET_LINK && | |
57 | !(((l->injection_type) & LIBNET_ADV_MASK))) | |
58 | { | |
59 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
60 | "%s(): called with non-link layer wire injection primitive", | |
61 | __func__); | |
62 | p = NULL; | |
63 | goto bad; | |
64 | } | |
65 | ||
66 | n = LIBNET_ETH_H + payload_s; | |
67 | h = 0; | |
68 | ||
69 | /* | |
70 | * Find the existing protocol block if a ptag is specified, or create | |
71 | * a new one. | |
72 | */ | |
73 | p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ETH_H); | |
74 | if (p == NULL) | |
75 | { | |
76 | return (-1); | |
77 | } | |
78 | ||
79 | memset(ð_hdr, 0, sizeof(eth_hdr)); | |
80 | memcpy(eth_hdr.ether_dhost, dst, ETHER_ADDR_LEN); /* destination address */ | |
81 | memcpy(eth_hdr.ether_shost, src, ETHER_ADDR_LEN); /* source address */ | |
82 | eth_hdr.ether_type = htons(type); /* packet type */ | |
83 | ||
84 | n = libnet_pblock_append(l, p, (u_int8_t *)ð_hdr, LIBNET_ETH_H); | |
85 | if (n == -1) | |
86 | { | |
87 | goto bad; | |
88 | } | |
89 | ||
90 | if ((payload && !payload_s) || (!payload && payload_s)) | |
91 | { | |
92 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
93 | "%s(): payload inconsistency\n", __func__); | |
94 | goto bad; | |
95 | } | |
96 | ||
97 | if (payload && payload_s) | |
98 | { | |
99 | n = libnet_pblock_append(l, p, payload, payload_s); | |
100 | if (n == -1) | |
101 | { | |
102 | goto bad; | |
103 | } | |
104 | } | |
105 | ||
106 | return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_ETH_H)); | |
107 | bad: | |
108 | libnet_pblock_delete(l, p); | |
109 | return (-1); | |
110 | } | |
111 | ||
112 | ||
113 | libnet_ptag_t | |
114 | libnet_autobuild_ethernet(u_int8_t *dst, u_int16_t type, libnet_t *l) | |
115 | { | |
116 | u_int32_t n, h; | |
117 | struct libnet_ether_addr *src; | |
118 | libnet_pblock_t *p; | |
119 | libnet_ptag_t ptag; | |
120 | struct libnet_ethernet_hdr eth_hdr; | |
121 | ||
122 | if (l == NULL) | |
123 | { | |
124 | return (-1); | |
125 | } | |
126 | ||
127 | /* sanity check injection type if we're not in advanced mode */ | |
128 | if (l->injection_type != LIBNET_LINK && | |
129 | !(((l->injection_type) & LIBNET_ADV_MASK))) | |
130 | { | |
131 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
132 | "libnet_autobuild_ethernet() called with non-link layer wire" | |
133 | " injection primitive"); | |
134 | p = NULL; | |
135 | goto bad; | |
136 | } | |
137 | ||
138 | n = LIBNET_ETH_H; | |
139 | h = 0; | |
140 | ptag = LIBNET_PTAG_INITIALIZER; | |
141 | src = libnet_get_hwaddr(l); | |
142 | if (src == NULL) | |
143 | { | |
144 | /* err msg set in libnet_get_hwaddr() */ | |
145 | return (-1); | |
146 | } | |
147 | ||
148 | /* | |
149 | * Create a new pblock. | |
150 | */ | |
151 | p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ETH_H); | |
152 | if (p == NULL) | |
153 | { | |
154 | return (-1); | |
155 | } | |
156 | ||
157 | memset(ð_hdr, 0, sizeof(eth_hdr)); | |
158 | memcpy(eth_hdr.ether_dhost, dst, ETHER_ADDR_LEN); /* destination address */ | |
159 | memcpy(eth_hdr.ether_shost, src, ETHER_ADDR_LEN); /* source address */ | |
160 | eth_hdr.ether_type = htons(type); /* packet type */ | |
161 | ||
162 | n = libnet_pblock_append(l, p, (u_int8_t *)ð_hdr, LIBNET_ETH_H); | |
163 | if (n == -1) | |
164 | { | |
165 | goto bad; | |
166 | } | |
167 | ||
168 | return (libnet_pblock_update(l, p, h, LIBNET_PBLOCK_ETH_H)); | |
169 | bad: | |
170 | libnet_pblock_delete(l, p); | |
171 | return (-1); | |
172 | } | |
173 | /* EOF */ |