1: /*
2: * $Id: libnet_build_cdp.c,v 1.1.1.2 2013/07/22 11:54:42 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(uint8_t version, uint8_t ttl, uint16_t sum, uint16_t type,
44: uint16_t len, const uint8_t *value, const uint8_t *payload, uint32_t payload_s,
45: libnet_t *l, libnet_ptag_t ptag)
46: {
47: uint32_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 + LIBNET_CDP_H + len + payload_s;
57: h = LIBNET_CDP_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, (uint8_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: /* boilerplate payload sanity check / append macro */
90: LIBNET_DO_PAYLOAD(l, p);
91:
92: if (sum == 0)
93: {
94: /*
95: * If checksum is zero, by default libnet will compute a checksum
96: * for the user. The programmer can override this by calling
97: * libnet_toggle_checksum(l, ptag, 1);
98: */
99: libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
100: }
101: return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_CDP_H));
102: bad:
103: libnet_pblock_delete(l, p);
104: return (-1);
105: }
106:
107:
108: int
109: /* Not Yet Implemented */
110: libnet_build_cdp_value(uint16_t type, uint16_t len, uint8_t *value, libnet_t *l,
111: libnet_ptag_t ptag)
112: {
113: uint32_t n;
114: libnet_pblock_t *p;
115: struct libnet_cdp_value_hdr cdp_value_hdr;
116:
117: if (l == NULL)
118: {
119: return (-1);
120: }
121:
122: /*
123: * Find the existing protocol block.
124: */
125: p = libnet_pblock_find(l, ptag);
126: if (p == NULL)
127: {
128: /* err msg set in libnet_pblock_find */
129: return (-1);
130: }
131: if (p->type != LIBNET_PBLOCK_CDP_H)
132: {
133: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
134: "libnet_build_cdp_value: ptag references different type than expected");
135: return (-1);
136: }
137:
138: memset(&cdp_value_hdr, 0, sizeof(cdp_value_hdr));
139: cdp_value_hdr.cdp_type = htons(type);
140: cdp_value_hdr.cdp_len = htons(len + LIBNET_CDP_VALUE_H); /* 4 bytes for len and type */
141:
142: switch (type)
143: {
144: case LIBNET_CDP_DEVID:
145: break;
146: case LIBNET_CDP_ADDRESS:
147: break;
148: case LIBNET_CDP_PORTID:
149: break;
150: case LIBNET_CDP_CAPABIL:
151: break;
152: case LIBNET_CDP_VERSION:
153: break;
154: case LIBNET_CDP_PLATFORM:
155: break;
156: case LIBNET_CDP_IPPREFIX:
157: break;
158: default:
159: break;
160: }
161:
162: n = libnet_pblock_append(l, p, (uint8_t *)&cdp_value_hdr, LIBNET_CDP_VALUE_H);
163: if (n == -1)
164: {
165: return (-1);
166: }
167:
168: n = libnet_pblock_append(l, p, value, len);
169: if (n == -1)
170: {
171: /* err msg set in libnet_pblock_append() */
172: return (-1);
173: }
174:
175: return (1);
176: }
177:
178: /* EOF */
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