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[FreeBSD/releng/10.2.git] / contrib / ipfilter / ipsend / sbpf.c
1 /* $FreeBSD$ */
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 #if BSD < 199103
16 #include <sys/fcntlcom.h>
17 #endif
18 #if (__FreeBSD_version >= 300000)
19 # include <sys/dirent.h>
20 #else
21 # include <sys/dir.h>
22 #endif
23 #include <net/bpf.h>
24
25 #include <net/if.h>
26 #include <netinet/in.h>
27 #include <netinet/in_systm.h>
28 #include <netinet/ip.h>
29 #include <netinet/udp.h>
30 #include <netinet/tcp.h>
31
32 #include <stdio.h>
33 #include <netdb.h>
34 #include <string.h>
35 #include <unistd.h>
36 #include <stdlib.h>
37 #ifdef __NetBSD__
38 # include <paths.h>
39 #endif
40 #include <ctype.h>
41 #include <signal.h>
42 #include <errno.h>
43
44 #include "ipsend.h"
45
46 #if !defined(lint)
47 static const char sccsid[] = "@(#)sbpf.c        1.3 8/25/95 (C)1995 Darren Reed";
48 static const char rcsid[] = "@(#)$Id$";
49 #endif
50
51 /*
52  * the code herein is dervied from libpcap.
53  */
54 static  u_char  *buf = NULL;
55 static  int     bufsize = 0, timeout = 1;
56
57
58 int     initdevice(device, tout)
59         char    *device;
60         int     tout;
61 {
62         struct  bpf_version bv;
63         struct  timeval to;
64         struct  ifreq ifr;
65 #ifdef _PATH_BPF
66         char    *bpfname = _PATH_BPF;
67         int     fd;
68
69         if ((fd = open(bpfname, O_RDWR)) < 0)
70             {
71                 fprintf(stderr, "no bpf devices available as /dev/bpfxx\n");
72                 return -1;
73             }
74 #else
75         char    bpfname[16];
76         int     fd = 0, i;
77
78         for (i = 0; i < 16; i++)
79             {
80                 (void) sprintf(bpfname, "/dev/bpf%d", i);
81                 if ((fd = open(bpfname, O_RDWR)) >= 0)
82                         break;
83             }
84         if (i == 16)
85             {
86                 fprintf(stderr, "no bpf devices available as /dev/bpfxx\n");
87                 return -1;
88             }
89 #endif
90
91         if (ioctl(fd, BIOCVERSION, (caddr_t)&bv) < 0)
92             {
93                 perror("BIOCVERSION");
94                 return -1;
95             }
96         if (bv.bv_major != BPF_MAJOR_VERSION ||
97             bv.bv_minor < BPF_MINOR_VERSION)
98             {
99                 fprintf(stderr, "kernel bpf (v%d.%d) filter out of date:\n",
100                         bv.bv_major, bv.bv_minor);
101                 fprintf(stderr, "current version: %d.%d\n",
102                         BPF_MAJOR_VERSION, BPF_MINOR_VERSION);
103                 return -1;
104             }
105
106         (void) strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
107         if (ioctl(fd, BIOCSETIF, &ifr) == -1)
108             {
109                 fprintf(stderr, "%s(%d):", ifr.ifr_name, fd);
110                 perror("BIOCSETIF");
111                 exit(1);
112             }
113         /*
114          * get kernel buffer size
115          */
116         if (ioctl(fd, BIOCGBLEN, &bufsize) == -1)
117             {
118                 perror("BIOCSBLEN");
119                 exit(-1);
120             }
121         buf = (u_char*)malloc(bufsize);
122         /*
123          * set the timeout
124          */
125         timeout = tout;
126         to.tv_sec = 1;
127         to.tv_usec = 0;
128         if (ioctl(fd, BIOCSRTIMEOUT, (caddr_t)&to) == -1)
129             {
130                 perror("BIOCSRTIMEOUT");
131                 exit(-1);
132             }
133
134         (void) ioctl(fd, BIOCFLUSH, 0);
135         return fd;
136 }
137
138
139 /*
140  * output an IP packet onto a fd opened for /dev/bpf
141  */
142 int     sendip(fd, pkt, len)
143         int     fd, len;
144         char    *pkt;
145 {
146         if (write(fd, pkt, len) == -1)
147             {
148                 perror("send");
149                 return -1;
150             }
151
152         return len;
153 }