1/* $FreeBSD: stable/11/contrib/ipfilter/ipsend/sbpf.c 369277 2021-02-16 00:48:38Z cy $ */
2/*
3 * (C)opyright 1995-1998 Darren Reed. (from tcplog)
4 *
5 * See the IPFILTER.LICENCE file for details on licencing.
6 *
7 */
8#include <sys/param.h>
9#include <sys/types.h>
10#include <sys/mbuf.h>
11#include <sys/time.h>
12#include <sys/socket.h>
13#include <sys/file.h>
14#include <sys/ioctl.h>
15#ifdef __FreeBSD__
16# include <sys/dirent.h>
17#else
18# include <sys/dir.h>
19#endif
20#include <net/bpf.h>
21
22#include <net/if.h>
23#include <netinet/in.h>
24#include <netinet/in_systm.h>
25#include <netinet/ip.h>
26#include <netinet/udp.h>
27#include <netinet/tcp.h>
28
29#include <stdio.h>
30#include <netdb.h>
31#include <string.h>
32#include <unistd.h>
33#include <stdlib.h>
34#ifdef __NetBSD__
35# include <paths.h>
36#endif
37#include <ctype.h>
38#include <signal.h>
39#include <errno.h>
40
41#include "ipsend.h"
42
43#if !defined(lint)
44static const char sccsid[] = "@(#)sbpf.c	1.3 8/25/95 (C)1995 Darren Reed";
45static const char rcsid[] = "@(#)$Id$";
46#endif
47
48/*
49 * the code herein is dervied from libpcap.
50 */
51static	u_char	*buf = NULL;
52static	int	bufsize = 0, timeout = 1;
53
54
55int	initdevice(device, tout)
56	char	*device;
57	int	tout;
58{
59	struct	bpf_version bv;
60	struct	timeval to;
61	struct	ifreq ifr;
62#ifdef _PATH_BPF
63	char	*bpfname = _PATH_BPF;
64	int	fd;
65
66	if ((fd = open(bpfname, O_RDWR)) < 0)
67	    {
68		fprintf(stderr, "no bpf devices available as /dev/bpfxx\n");
69		return -1;
70	    }
71#else
72	char	bpfname[16];
73	int	fd = 0, i;
74
75	for (i = 0; i < 16; i++)
76	    {
77		(void) sprintf(bpfname, "/dev/bpf%d", i);
78		if ((fd = open(bpfname, O_RDWR)) >= 0)
79			break;
80	    }
81	if (i == 16)
82	    {
83		fprintf(stderr, "no bpf devices available as /dev/bpfxx\n");
84		return -1;
85	    }
86#endif
87
88	if (ioctl(fd, BIOCVERSION, (caddr_t)&bv) < 0)
89	    {
90		perror("BIOCVERSION");
91		return -1;
92	    }
93	if (bv.bv_major != BPF_MAJOR_VERSION ||
94	    bv.bv_minor < BPF_MINOR_VERSION)
95	    {
96		fprintf(stderr, "kernel bpf (v%d.%d) filter out of date:\n",
97			bv.bv_major, bv.bv_minor);
98		fprintf(stderr, "current version: %d.%d\n",
99			BPF_MAJOR_VERSION, BPF_MINOR_VERSION);
100		return -1;
101	    }
102
103	(void) strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
104	if (ioctl(fd, BIOCSETIF, &ifr) == -1)
105	    {
106		fprintf(stderr, "%s(%d):", ifr.ifr_name, fd);
107		perror("BIOCSETIF");
108		exit(1);
109	    }
110	/*
111	 * get kernel buffer size
112	 */
113	if (ioctl(fd, BIOCGBLEN, &bufsize) == -1)
114	    {
115		perror("BIOCSBLEN");
116		exit(-1);
117	    }
118	buf = (u_char*)malloc(bufsize);
119	/*
120	 * set the timeout
121	 */
122	timeout = tout;
123	to.tv_sec = 1;
124	to.tv_usec = 0;
125	if (ioctl(fd, BIOCSRTIMEOUT, (caddr_t)&to) == -1)
126	    {
127		perror("BIOCSRTIMEOUT");
128		exit(-1);
129	    }
130
131	(void) ioctl(fd, BIOCFLUSH, 0);
132	return fd;
133}
134
135
136/*
137 * output an IP packet onto a fd opened for /dev/bpf
138 */
139int	sendip(fd, pkt, len)
140	int	fd, len;
141	char	*pkt;
142{
143	if (write(fd, pkt, len) == -1)
144	    {
145		perror("send");
146		return -1;
147	    }
148
149	return len;
150}
151