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)
52 static __attribute__((__used__)) const char sccsid[] = "@(#)sbpf.c 1.3 8/25/95 (C)1995 Darren Reed";
53 static __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 */
59 static u_char *buf = NULL;
60 static int bufsize = 0, timeout = 1;
61
62
initdevice(device,tout)63 int 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104 fprintf(stderr, "kernel bpf (v%d.%d) filter out of date:\n",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 */
sendip(fd,pkt,len)147 int 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