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1 | /* |
2 | * $Id: libnet_build_cdp.c,v 1.20 2005/11/29 22:10:45 carlosc Exp $ | |
3 | * | |
4 | * libnet | |
5 | * libnet_build_cdp.c - CDP 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_cdp(u_int8_t version, u_int8_t ttl, u_int16_t sum, u_int16_t type, | |
44 | u_int16_t len, u_int8_t *value, u_int8_t *payload, u_int32_t payload_s, | |
45 | libnet_t *l, libnet_ptag_t ptag) | |
46 | { | |
47 | u_int32_t n,h; | |
48 | libnet_pblock_t *p; | |
49 | struct libnet_cdp_hdr cdp_hdr; | |
50 | ||
51 | if (l == NULL) | |
52 | { | |
53 | return (-1); | |
54 | } | |
55 | ||
56 | n = LIBNET_CDP_H + len + payload_s; | |
57 | h = LIBNET_CDP_H + len + payload_s; | |
58 | ||
59 | /* | |
60 | * Find the existing protocol block if a ptag is specified, or create | |
61 | * a new one. | |
62 | */ | |
63 | p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_CDP_H); | |
64 | if (p == NULL) | |
65 | { | |
66 | return (-1); | |
67 | } | |
68 | ||
69 | memset(&cdp_hdr, 0, sizeof(cdp_hdr)); | |
70 | cdp_hdr.cdp_version = version; | |
71 | cdp_hdr.cdp_ttl = ttl; | |
72 | cdp_hdr.cdp_sum = (sum ? htons(sum) : 0); | |
73 | cdp_hdr.cdp_type = htons(type); | |
74 | cdp_hdr.cdp_len = htons(len + 4); /* 4 bytes for len and type */ | |
75 | ||
76 | n = libnet_pblock_append(l, p, (u_int8_t *)&cdp_hdr, LIBNET_CDP_H); | |
77 | if (n == -1) | |
78 | { | |
79 | goto bad; | |
80 | } | |
81 | ||
82 | n = libnet_pblock_append(l, p, value, len); | |
83 | if (n == -1) | |
84 | { | |
85 | /* err msg set in libnet_pblock_append() */ | |
86 | goto bad; | |
87 | } | |
88 | ||
89 | if ((payload && !payload_s) || (!payload && payload_s)) | |
90 | { | |
91 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
92 | "%s(): payload inconsistency\n", __func__); | |
93 | goto bad; | |
94 | } | |
95 | ||
96 | if (payload && payload_s) | |
97 | { | |
98 | n = libnet_pblock_append(l, p, payload, payload_s); | |
99 | if (n == -1) | |
100 | { | |
101 | goto bad; | |
102 | } | |
103 | } | |
104 | ||
105 | if (sum == 0) | |
106 | { | |
107 | /* | |
108 | * If checksum is zero, by default libnet will compute a checksum | |
109 | * for the user. The programmer can override this by calling | |
110 | * libnet_toggle_checksum(l, ptag, 1); | |
111 | */ | |
112 | libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM); | |
113 | } | |
114 | return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_CDP_H)); | |
115 | bad: | |
116 | libnet_pblock_delete(l, p); | |
117 | return (-1); | |
118 | } | |
119 | ||
120 | ||
121 | int | |
122 | /* Not Yet Implemented */ | |
123 | libnet_build_cdp_value(u_int16_t type, u_int16_t len, u_int8_t *value, libnet_t *l, | |
124 | libnet_ptag_t ptag) | |
125 | { | |
126 | u_int32_t n; | |
127 | libnet_pblock_t *p; | |
128 | struct libnet_cdp_value_hdr cdp_value_hdr; | |
129 | ||
130 | if (l == NULL) | |
131 | { | |
132 | return (-1); | |
133 | } | |
134 | ||
135 | /* | |
136 | * Find the existing protocol block. | |
137 | */ | |
138 | p = libnet_pblock_find(l, ptag); | |
139 | if (p == NULL) | |
140 | { | |
141 | /* err msg set in libnet_pblock_find */ | |
142 | return (-1); | |
143 | } | |
144 | if (p->type != LIBNET_PBLOCK_CDP_H) | |
145 | { | |
146 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
147 | "libnet_build_cdp_value: ptag references different type than expected"); | |
148 | return (-1); | |
149 | } | |
150 | ||
151 | memset(&cdp_value_hdr, 0, sizeof(cdp_value_hdr)); | |
152 | cdp_value_hdr.cdp_type = htons(type); | |
153 | cdp_value_hdr.cdp_len = htons(len + 4); /* 4 bytes for len and type */ | |
154 | ||
155 | switch (type) | |
156 | { | |
157 | case LIBNET_CDP_DEVID: | |
158 | break; | |
159 | case LIBNET_CDP_ADDRESS: | |
160 | break; | |
161 | case LIBNET_CDP_PORTID: | |
162 | break; | |
163 | case LIBNET_CDP_CAPABIL: | |
164 | break; | |
165 | case LIBNET_CDP_VERSION: | |
166 | break; | |
167 | case LIBNET_CDP_PLATFORM: | |
168 | break; | |
169 | case LIBNET_CDP_IPPREFIX: | |
170 | break; | |
171 | default: | |
172 | break; | |
173 | } | |
174 | ||
175 | n = libnet_pblock_append(l, p, (u_int8_t *)&cdp_value_hdr, LIBNET_CDP_H); | |
176 | if (n == -1) | |
177 | { | |
178 | return (-1); | |
179 | } | |
180 | ||
181 | n = libnet_pblock_append(l, p, value, len); | |
182 | if (n == -1) | |
183 | { | |
184 | /* err msg set in libnet_pblock_append() */ | |
185 | return (-1); | |
186 | } | |
187 | ||
188 | return (1); | |
189 | } | |
190 | ||
191 | /* EOF */ |