1/*	$NetBSD: sbpf.c,v 1.4 2018/02/04 08:19:42 mrg Exp $	*/
2
3/*
4 * (C)opyright 1995-1998 Darren Reed. (from tcplog)
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 *
8 */
9#include <sys/param.h>
10#include <sys/types.h>
11#include <sys/mbuf.h>
12#include <sys/time.h>
13#include <sys/timeb.h>
14#include <sys/socket.h>
15#include <sys/file.h>
16#include <sys/ioctl.h>
17#if BSD < 199103
18#include <sys/fcntlcom.h>
19#endif
20#if (__FreeBSD_version >= 300000)
21# include <sys/dirent.h>
22#else
23# include <sys/dir.h>
24#endif
25#include <net/bpf.h>
26
27#include <net/if.h>
28#include <netinet/in.h>
29#include <netinet/in_systm.h>
30#include <netinet/ip.h>
31#include <netinet/ip_icmp.h>
32#include <netinet/ip_var.h>
33#include <netinet/udp.h>
34#include <netinet/tcp.h>
35
36#include <stdio.h>
37#include <netdb.h>
38#include <string.h>
39#include <unistd.h>
40#include <stdlib.h>
41#ifdef __NetBSD__
42# include <paths.h>
43#endif
44#include <ctype.h>
45#include <signal.h>
46#include <errno.h>
47
48#include "ip_compat.h"
49#include "ipsend.h"
50
51#if !defined(lint)
52static __attribute__((__used__)) const char sccsid[] = "@(#)sbpf.c	1.3 8/25/95 (C)1995 Darren Reed";
53static __attribute__((__used__)) const char rcsid[] = "@(#)Id: sbpf.c,v 1.1.1.2 2012/07/22 13:44:37 darrenr Exp $";
54#endif
55
56/*
57 * the code herein is dervied from libpcap.
58 */
59static	u_char	*buf = NULL;
60static	int	bufsize = 0, timeout = 1;
61
62
63int	initdevice(device, tout)
64	char	*device;
65	int	tout;
66{
67	struct	bpf_version bv;
68	struct	timeval to;
69	struct	ifreq ifr;
70#ifdef _PATH_BPF
71	char	*bpfname = _PATH_BPF;
72	int	fd;
73
74	if ((fd = open(bpfname, O_RDWR)) < 0)
75	    {
76		fprintf(stderr, "no bpf devices available as /dev/bpfxx\n");
77		return -1;
78	    }
79#else
80	char	bpfname[16];
81	int	fd = 0, i;
82
83	for (i = 0; i < 16; i++)
84	    {
85		(void) sprintf(bpfname, "/dev/bpf%d", i);
86		if ((fd = open(bpfname, O_RDWR)) >= 0)
87			break;
88	    }
89	if (i == 16)
90	    {
91		fprintf(stderr, "no bpf devices available as /dev/bpfxx\n");
92		return -1;
93	    }
94#endif
95
96	if (ioctl(fd, BIOCVERSION, (caddr_t)&bv) < 0)
97	    {
98		perror("BIOCVERSION");
99		return -1;
100	    }
101	if (bv.bv_major != BPF_MAJOR_VERSION ||
102	    bv.bv_minor < BPF_MINOR_VERSION)
103	    {
104		fprintf(stderr, "kernel bpf (v%d.%d) filter out of date:\n",
105			bv.bv_major, bv.bv_minor);
106		fprintf(stderr, "current version: %d.%d\n",
107			BPF_MAJOR_VERSION, BPF_MINOR_VERSION);
108		return -1;
109	    }
110
111	(void) strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
112	if (ioctl(fd, BIOCSETIF, &ifr) == -1)
113	    {
114		fprintf(stderr, "%s(%d):", ifr.ifr_name, fd);
115		perror("BIOCSETIF");
116		exit(1);
117	    }
118	/*
119	 * get kernel buffer size
120	 */
121	if (ioctl(fd, BIOCGBLEN, &bufsize) == -1)
122	    {
123		perror("BIOCSBLEN");
124		exit(-1);
125	    }
126	buf = (u_char*)malloc(bufsize);
127	/*
128	 * set the timeout
129	 */
130	timeout = tout;
131	to.tv_sec = 1;
132	to.tv_usec = 0;
133	if (ioctl(fd, BIOCSRTIMEOUT, (caddr_t)&to) == -1)
134	    {
135		perror("BIOCSRTIMEOUT");
136		exit(-1);
137	    }
138
139	(void) ioctl(fd, BIOCFLUSH, 0);
140	return fd;
141}
142
143
144/*
145 * output an IP packet onto a fd opened for /dev/bpf
146 */
147int	sendip(fd, pkt, len)
148	int	fd, len;
149	char	*pkt;
150{
151	if (write(fd, pkt, len) == -1)
152	    {
153		perror("send");
154		return -1;
155	    }
156
157	return len;
158}
159