1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2025 Rubicon Communications, LLC (Netgate)
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 */
28
29 #include <err.h>
30 #include <stdio.h>
31 #include <pcap.h>
32 #include <unistd.h>
33
34 static void
callback(u_char * arg __unused,const struct pcap_pkthdr * hdr __unused,const unsigned char * bytes __unused)35 callback(u_char *arg __unused, const struct pcap_pkthdr *hdr __unused,
36 const unsigned char *bytes __unused)
37 {
38 }
39
40 int
main(int argc,const char ** argv)41 main(int argc, const char **argv)
42 {
43 pcap_t *pcap;
44 const char *interface;
45 char errbuf[PCAP_ERRBUF_SIZE] = { 0 };
46 int ret;
47
48 if (argc != 2)
49 err(1, "Usage: %s <interface>\n", argv[0]);
50
51 interface = argv[1];
52
53 pcap = pcap_create(interface, errbuf);
54 if (! pcap)
55 perror("Failed to pcap interface");
56
57 ret = pcap_set_snaplen(pcap, 86);
58 if (ret != 0)
59 perror("Failed to set snaplen");
60
61 ret = pcap_set_timeout(pcap, 100);
62 if (ret != 0)
63 perror("Failed to set timeout");
64
65 ret = pcap_activate(pcap);
66 if (ret != 0)
67 perror("Failed to activate");
68
69 /* So we have two readers on one /dev/bpf fd */
70 fork();
71
72 printf("Interface open\n");
73 pcap_loop(pcap, 0, callback, NULL);
74
75 return (0);
76 }
77