1: /*
2: * $Id: rpc_udp.c,v 1.1.1.3 2023/09/27 11:11:38 misho Exp $
3: *
4: * libnet 1.1
5: * Build an RPC UDP packet
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: #include "./libnet_test.h"
37:
38:
39: int
40: main(int argc, char *argv[])
41: {
42: int c;
43: char *cp;
44: libnet_t *l;
45: libnet_ptag_t t;
46: libnet_ptag_t ip;
47: libnet_ptag_t udp;
48: char *payload;
49: u_short payload_s;
50: u_long src_ip, dst_ip;
51: u_short src_prt, dst_prt;
52: char errbuf[LIBNET_ERRBUF_SIZE];
53:
54: printf("libnet 1.1 packet shaping: RPC + UDP + IP options[raw]\n");
55:
56: /*
57: * Initialize the library. Root priviledges are required.
58: */
59: l = libnet_init(
60: LIBNET_RAW4, /* injection type */
61: NULL, /* network interface */
62: errbuf); /* errbuf */
63:
64: if (l == NULL)
65: {
66: fprintf(stderr, "libnet_init() failed: %s\n", errbuf);
67: exit(EXIT_FAILURE);
68: }
69:
70: src_ip = 0;
71: dst_ip = 0;
72: src_prt = 0;
73: dst_prt = 0;
74: payload = NULL;
75: payload_s = 0;
76: udp = 0;
77: while ((c = getopt(argc, argv, "d:s:p:")) != EOF)
78: {
79: switch (c)
80: {
81: /*
82: * We expect the input to be of the form `ip.ip.ip.ip.port`. We
83: * point cp to the last dot of the IP address/port string and
84: * then seperate them with a NULL byte. The optarg now points to
85: * just the IP address, and cp points to the port.
86: */
87: case 'd':
88: if (!(cp = strrchr(optarg, '.')))
89: {
90: usage(argv[0]);
91: }
92: *cp++ = 0;
93: dst_prt = (u_short)atoi(cp);
94: if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
95: {
96: fprintf(stderr, "Bad destination IP address: %s\n", optarg); exit(EXIT_FAILURE);
97: }
98: break;
99: case 's':
100: if (!(cp = strrchr(optarg, '.')))
101: {
102: usage(argv[0]);
103: }
104: *cp++ = 0;
105: src_prt = (u_short)atoi(cp);
106: if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
107: {
108: fprintf(stderr, "Bad source IP address: %s\n", optarg);
109: exit(EXIT_FAILURE);
110: }
111: break;
112: case 'p':
113: payload = optarg;
114: payload_s = strlen(payload);
115: break;
116: default:
117: exit(EXIT_FAILURE);
118: }
119: }
120:
121: if (!src_ip || !src_prt || !dst_ip || !dst_prt)
122: {
123: usage(argv[0]);
124: exit(EXIT_FAILURE);
125: }
126:
127: t = libnet_build_rpc_call(
128: 0,
129: 0x10e70082,
130: 0x000186a0,
131: 2,
132: 4,
133: 0,
134: 0,
135: NULL,
136: 0,
137: 0,
138: NULL,
139: (uint8_t *)payload,
140: payload_s,
141: l,
142: 0);
143: if (t == -1)
144: {
145: fprintf(stderr, "Can't build RPC header: %s\n", libnet_geterror(l));
146: goto bad;
147: }
148:
149: udp = libnet_build_udp(
150: src_prt, /* source port */
151: dst_prt, /* destination port */
152: LIBNET_UDP_H + 40 +payload_s, /* packet length */
153: 0, /* checksum */
154: NULL, /* payload */
155: 0, /* payload size */
156: l, /* libnet handle */
157: udp); /* libnet id */
158: if (udp == -1)
159: {
160: fprintf(stderr, "Can't build UDP header: %s\n", libnet_geterror(l));
161: goto bad;
162: }
163:
164: ip = libnet_build_ipv4(
165: LIBNET_IPV4_H + 40 + payload_s + LIBNET_UDP_H, /* length */
166: 0, /* TOS */
167: 242, /* IP ID */
168: 0, /* IP Frag */
169: 64, /* TTL */
170: IPPROTO_UDP, /* protocol */
171: 0, /* checksum */
172: src_ip,
173: dst_ip,
174: NULL, /* payload */
175: 0, /* payload size */
176: l, /* libnet handle */
177: 0); /* libnet id */
178: if (ip == -1)
179: {
180: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
181: goto bad;
182: }
183:
184: /*
185: * Write it to the wire.
186: */
187: c = libnet_write(l);
188: if (c == -1)
189: {
190: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
191: goto bad;
192: }
193: else
194: {
195: fprintf(stderr, "Wrote %d byte RPC UDP packet; check the wire.\n", c);
196: }
197:
198: libnet_destroy(l);
199: return (EXIT_SUCCESS);
200: bad:
201: libnet_destroy(l);
202: return (EXIT_FAILURE);
203: }
204:
205: void
206: usage(char *name)
207: {
208: fprintf(stderr,
209: "usage: %s -s source_ip.source_port -d destination_ip.destination_port"
210: " [-p payload]\n",
211: name);
212: }
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