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1 | /* |
2 | * $Id: libnet_build_stp.c,v 1.19 2005/11/29 22:49:48 carlosc Exp $ | |
3 | * | |
4 | * libnet | |
5 | * libnet_build_stp.c - STP 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_stp_conf(u_int16_t id, u_int8_t version, u_int8_t bpdu_type, | |
44 | u_int8_t flags, u_int8_t *root_id, u_int32_t root_pc, u_int8_t *bridge_id, | |
45 | u_int16_t port_id, u_int16_t message_age, u_int16_t max_age, | |
46 | u_int16_t hello_time, u_int16_t f_delay, u_int8_t *payload, | |
47 | u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag) | |
48 | { | |
49 | u_int32_t n, h; | |
50 | libnet_pblock_t *p; | |
51 | ||
52 | /* until we get some data marshalling in place we can't use this */ | |
53 | /* struct libnet_stp_conf_hdr stp_hdr; */ | |
54 | u_int8_t stp_hdr[35]; | |
55 | u_int16_t value_s; | |
56 | u_int32_t value_l; | |
57 | ||
58 | if (l == NULL) | |
59 | { | |
60 | return (-1); | |
61 | } | |
62 | ||
63 | n = LIBNET_STP_CONF_H + payload_s; /* size of memory block */ | |
64 | h = 0; /* no checksum */ | |
65 | ||
66 | /* | |
67 | * Find the existing protocol block if a ptag is specified, or create | |
68 | * a new one. | |
69 | */ | |
70 | p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_STP_CONF_H); | |
71 | if (p == NULL) | |
72 | { | |
73 | return (-1); | |
74 | } | |
75 | ||
76 | /* until we get some data marshalling in place we can't use this */ | |
77 | /* | |
78 | stp_hdr.stp_id = htons(id); | |
79 | stp_hdr.stp_version = version; | |
80 | stp_hdr.stp_bpdu_type = bpdu_type; | |
81 | stp_hdr.stp_flags = flags; | |
82 | memcpy(&stp_hdr.stp_rootid, root_id, 8); | |
83 | stp_hdr.stp_rootpc = htonl(root_pc); | |
84 | memcpy(&stp_hdr.stp_bridgeid, bridge_id, 8); | |
85 | stp_hdr.stp_portid = htons(port_id); | |
86 | stp_hdr.stp_mage = htons(message_age); | |
87 | stp_hdr.stp_maxage = htons(max_age); | |
88 | stp_hdr.stp_hellot = htons(hello_time); | |
89 | stp_hdr.stp_fdelay = htons(f_delay); | |
90 | */ | |
91 | ||
92 | value_s = htons(id); | |
93 | memcpy(stp_hdr, &value_s, 2); | |
94 | stp_hdr[2] = version; | |
95 | stp_hdr[3] = bpdu_type; | |
96 | stp_hdr[4] = flags; | |
97 | memcpy(&stp_hdr[5], root_id, 8); | |
98 | value_l = htonl(root_pc); | |
99 | memcpy(&stp_hdr[13], &value_l, 4); | |
100 | memcpy(&stp_hdr[17], bridge_id, 8); | |
101 | value_s = htons(port_id); | |
102 | memcpy(&stp_hdr[25], &value_s, 2); | |
103 | #if (LIBNET_BIG_ENDIAN == 1) | |
104 | value_s = htons(message_age); | |
105 | #else | |
106 | value_s = message_age; | |
107 | #endif | |
108 | memcpy(&stp_hdr[27], &value_s, 2); | |
109 | #if (LIBNET_BIG_ENDIAN == 1) | |
110 | value_s = htons(max_age); | |
111 | #else | |
112 | value_s = max_age; | |
113 | #endif | |
114 | memcpy(&stp_hdr[29], &value_s, 2); | |
115 | #if (LIBNET_BIG_ENDIAN == 1) | |
116 | value_s = htons(hello_time); | |
117 | #else | |
118 | value_s = hello_time; | |
119 | #endif | |
120 | memcpy(&stp_hdr[31], &value_s, 2); | |
121 | #if (LIBNET_BIG_ENDIAN == 1) | |
122 | value_s = htons(f_delay); | |
123 | #else | |
124 | value_s = f_delay; | |
125 | #endif | |
126 | memcpy(&stp_hdr[33], &value_s, 2); | |
127 | ||
128 | ||
129 | /* until we get some data marshalling in place we can't use this */ | |
130 | /*n = libnet_pblock_append(l, p, (u_int8_t *)&stp_hdr, LIBNET_STP_CONF_H); */ | |
131 | n = libnet_pblock_append(l, p, stp_hdr, LIBNET_STP_CONF_H); | |
132 | if (n == -1) | |
133 | { | |
134 | goto bad; | |
135 | } | |
136 | ||
137 | if ((payload && !payload_s) || (!payload && payload_s)) | |
138 | { | |
139 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
140 | "%s(): payload inconsistency\n", __func__); | |
141 | goto bad; | |
142 | } | |
143 | ||
144 | if (payload && payload_s) | |
145 | { | |
146 | n = libnet_pblock_append(l, p, payload, payload_s); | |
147 | if (n == -1) | |
148 | { | |
149 | goto bad; | |
150 | } | |
151 | } | |
152 | ||
153 | return (ptag ? ptag : libnet_pblock_update(l, p, h, | |
154 | LIBNET_PBLOCK_STP_CONF_H)); | |
155 | bad: | |
156 | libnet_pblock_delete(l, p); | |
157 | return (-1); | |
158 | } | |
159 | ||
160 | ||
161 | libnet_ptag_t | |
162 | libnet_build_stp_tcn(u_int16_t id, u_int8_t version, u_int8_t bpdu_type, | |
163 | u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag) | |
164 | { | |
165 | u_int32_t n, h; | |
166 | libnet_pblock_t *p; | |
167 | ||
168 | struct libnet_stp_tcn_hdr stp_hdr; | |
169 | ||
170 | if (l == NULL) | |
171 | { | |
172 | return (-1); | |
173 | } | |
174 | ||
175 | n = LIBNET_STP_TCN_H + payload_s; /* size of memory block */ | |
176 | h = 0; /* no checksum */ | |
177 | ||
178 | /* | |
179 | * Find the existing protocol block if a ptag is specified, or create | |
180 | * a new one. | |
181 | */ | |
182 | p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_STP_TCN_H); | |
183 | if (p == NULL) | |
184 | { | |
185 | return (-1); | |
186 | } | |
187 | ||
188 | memset(&stp_hdr, 0, sizeof(stp_hdr)); | |
189 | stp_hdr.stp_id = htons(id); | |
190 | stp_hdr.stp_version = version; | |
191 | stp_hdr.stp_bpdu_type = bpdu_type; | |
192 | ||
193 | n = libnet_pblock_append(l, p, (u_int8_t *)&stp_hdr, LIBNET_STP_TCN_H); | |
194 | if (n == -1) | |
195 | { | |
196 | goto bad; | |
197 | } | |
198 | ||
199 | if ((payload && !payload_s) || (!payload && payload_s)) | |
200 | { | |
201 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
202 | "%s(): payload inconsistency\n", __func__); | |
203 | goto bad; | |
204 | } | |
205 | ||
206 | if (payload && payload_s) | |
207 | { | |
208 | n = libnet_pblock_append(l, p, payload, payload_s); | |
209 | if (n == -1) | |
210 | { | |
211 | goto bad; | |
212 | } | |
213 | } | |
214 | ||
215 | return (ptag ? ptag : libnet_pblock_update(l, p, h, | |
216 | LIBNET_PBLOCK_STP_TCN_H)); | |
217 | bad: | |
218 | libnet_pblock_delete(l, p); | |
219 | return (-1); | |
220 | } | |
221 | ||
222 | /* EOF */ |