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1 | /* |
2 | * $Id: libnet_build_isl.c,v 1.20 2005/11/29 22:06:28 carlosc Exp $ | |
3 | * | |
4 | * libnet | |
5 | * libnet_build_isl.c - cisco's inter-switch link 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_isl(u_int8_t *dhost, u_int8_t type, u_int8_t user, u_int8_t *shost, | |
44 | u_int16_t len, u_int8_t *snap, u_int16_t vid, u_int16_t index, | |
45 | u_int16_t reserved, u_int8_t *payload, u_int32_t payload_s, | |
46 | libnet_t *l, libnet_ptag_t ptag) | |
47 | { | |
48 | u_int32_t n, h; | |
49 | libnet_pblock_t *p; | |
50 | struct libnet_isl_hdr isl_hdr; | |
51 | ||
52 | if (l == NULL) | |
53 | { | |
54 | return (-1); | |
55 | } | |
56 | ||
57 | n = LIBNET_ISL_H + payload_s; /* size of memory block */ | |
58 | h = 0; | |
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_ISL_H); | |
65 | if (p == NULL) | |
66 | { | |
67 | return (-1); | |
68 | } | |
69 | ||
70 | memset(&isl_hdr, 0, sizeof(isl_hdr)); | |
71 | memcpy(&isl_hdr.isl_dhost, dhost, 5); | |
72 | isl_hdr.isl_type = type; | |
73 | isl_hdr.isl_user = user; | |
74 | memcpy(&isl_hdr.isl_shost, shost, 6); | |
75 | isl_hdr.isl_len = htons(len); | |
76 | memcpy(&isl_hdr.isl_dhost, snap, 6); | |
77 | isl_hdr.isl_vid = htons(vid); | |
78 | isl_hdr.isl_index = htons(index); | |
79 | isl_hdr.isl_reserved= htons(reserved); | |
80 | ||
81 | n = libnet_pblock_append(l, p, (u_int8_t *)&isl_hdr, LIBNET_ISL_H); | |
82 | if (n == -1) | |
83 | { | |
84 | goto bad; | |
85 | } | |
86 | ||
87 | if ((payload && !payload_s) || (!payload && payload_s)) | |
88 | { | |
89 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
90 | "%s(): payload inconsistency\n", __func__); | |
91 | goto bad; | |
92 | } | |
93 | ||
94 | if (payload && payload_s) | |
95 | { | |
96 | n = libnet_pblock_append(l, p, payload, payload_s); | |
97 | if (n == -1) | |
98 | { | |
99 | goto bad; | |
100 | } | |
101 | } | |
102 | ||
103 | /* we need to compute the CRC for the ethernet frame and the ISL frame */ | |
104 | libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM); | |
105 | return (ptag ? ptag : libnet_pblock_update(l, p, LIBNET_ISL_H, | |
106 | LIBNET_PBLOCK_ISL_H)); | |
107 | bad: | |
108 | libnet_pblock_delete(l, p); | |
109 | return (-1); | |
110 | } | |
111 | ||
112 | ||
113 | /* EOF */ |