1: /*
2: * $Id: libnet_build_cdp.c,v 1.1.1.1 2012/02/21 22:14:23 misho 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 */
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