1: /*
2: *
3: * libnet 1.1.2
4: * Build a HSRP packet
5: *
6: * Copyright (c) 2004 David Barroso Berrueta <tomac@wasahero.org>
7: * All rights reserved.
8: *
9: * Redistribution and use in source and binary forms, with or without
10: * modification, are permitted provided that the following conditions
11: * are met:
12: * 1. Redistributions of source code must retain the above copyright
13: * notice, this list of conditions and the following disclaimer.
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in the
16: * documentation and/or other materials provided with the distribution.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28: * SUCH DAMAGE.
29: *
30: */
31:
32: #if (HAVE_CONFIG_H)
33: #if ((_WIN32) && !(__CYGWIN__))
34: #include "../include/win32/config.h"
35: #else
36: #include "../include/config.h"
37: #endif
38: #endif
39: #include "./libnet_test.h"
40:
41:
42: int
43: main(int argc, char *argv[])
44: {
45: uint8_t version = LIBNET_HSRP_VERSION;
46: uint8_t opcode = LIBNET_HSRP_TYPE_HELLO;
47: uint8_t state = LIBNET_HSRP_STATE_ACTIVE;
48: uint8_t hello_time = 3;
49: uint8_t hold_time = 10;
50: uint8_t priority = 1;
51: uint8_t group = 1;
52: uint8_t reserved = 0;
53: uint8_t authdata[8];
54:
55: libnet_t *l;
56: char *device = NULL;
57: char src[] = "1.1.1.1";
58: char *eth_dst = "DE:AD:00:00:BE:EF";
59: char dst[] = "224.0.0.2";
60: int port = 1985;
61: int c;
62: u_long src_ip, dst_ip;
63: char errbuf[LIBNET_ERRBUF_SIZE];
64: libnet_ptag_t ptag = 0;
65:
66: printf("libnet 1.1.2 packet shaping: HSRP[link]\n");
67:
68: /*
69: * Initialize the library. Root priviledges are required.
70: */
71: l = libnet_init(
72: LIBNET_LINK_ADV, /* injection type */
73: device, /* network interface */
74: errbuf); /* error buffer */
75:
76: if (l == NULL)
77: {
78: fprintf(stderr, "libnet_init() failed: %s", errbuf);
79: exit(EXIT_FAILURE);
80: }
81:
82: printf("Using device %s\n", l->device);
83:
84: if ((dst_ip = libnet_name2addr4(l, dst, LIBNET_RESOLVE)) == (u_long)-1)
85: {
86: fprintf(stderr, "Bad destination IP address: %s\n", dst);
87: exit(EXIT_FAILURE);
88: }
89:
90: if ((src_ip = libnet_name2addr4(l, src, LIBNET_RESOLVE)) == (u_long)-1)
91: {
92: fprintf(stderr, "Bad source IP address: %s\n", src);
93: exit(EXIT_FAILURE);
94: }
95:
96: memset(authdata, 0, 8);
97: strncpy(authdata, "cisco", 5);
98:
99:
100: ptag = libnet_build_hsrp(
101: version,
102: opcode,
103: state,
104: hello_time, /* Recommended hello time */
105: hold_time, /* Recommended hold time */
106: priority, /* Priority */
107: group, /* Group */
108: reserved, /* Reserved */
109: authdata, /* Password */
110: src_ip, /* Virtual IP */
111: NULL,
112: 0,
113: l,
114: 0
115: );
116:
117: if (ptag == -1)
118: {
119: fprintf(stderr, "Can't build HSRP header: %s\n", libnet_geterror(l));
120: goto bad;
121: }
122:
123: ptag = libnet_build_udp(
124: port, /* source port */
125: port, /* destination port */
126: LIBNET_UDP_H + LIBNET_HSRP_H , /* packet length */
127: 0, /* checksum */
128: NULL, /* payload */
129: 0, /* payload size */
130: l, /* libnet handle */
131: 0); /* libnet id */
132:
133: if (ptag == -1)
134: {
135: fprintf(stderr, "Can't build UDP header: %s\n", libnet_geterror(l));
136: goto bad;
137: }
138:
139: ptag = libnet_build_ipv4(
140: LIBNET_IPV4_H + LIBNET_UDP_H + LIBNET_HSRP_H,/* length */
141: 0, /* TOS */
142: 666, /* IP ID */
143: 0, /* IP Frag */
144: 1 , /* TTL */
145: IPPROTO_UDP, /* protocol */
146: 0, /* checksum */
147: src_ip, /* source IP */
148: dst_ip, /* destination IP */
149: NULL, /* payload */
150: 0, /* payload size */
151: l, /* libnet handle */
152: 0); /* libnet id */
153:
154: if (ptag == -1)
155: {
156: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
157: exit(EXIT_FAILURE);
158: }
159:
160:
161: eth_dst = libnet_hex_aton(eth_dst, &c);
162: ptag = libnet_autobuild_ethernet(
163: eth_dst, /* ethernet destination */
164: ETHERTYPE_IP, /* protocol type */
165: l); /* libnet handle */
166:
167: free(eth_dst);
168: if (ptag == -1)
169: {
170: fprintf(stderr, "Can't build ethernet header: %s\n",
171: libnet_geterror(l));
172: goto bad;
173: }
174:
175:
176: /*
177: * write to the wire
178: */
179: c = libnet_write(l);
180: if (c == -1)
181: {
182: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
183: goto bad;
184: }
185: else
186: {
187: fprintf(stderr, "Wrote %d byte HSRP packet; check the wire.\n", c);
188: }
189: libnet_destroy(l);
190: return (EXIT_SUCCESS);
191: bad:
192: libnet_destroy(l);
193: return (EXIT_FAILURE);
194:
195: return 0;
196: }
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