1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/*
* (C)opyright 1995-1998 Darren Reed. (from tcplog)
*
* See the IPFILTER.LICENCE file for details on licencing.
*/
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <ctype.h>
#include <signal.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/time.h>
#include <sys/timeb.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#if BSD < 199103
#include <sys/fcntlcom.h>
#endif
#if (__FreeBSD_version >= 300000)
# include <sys/dirent.h>
#else
# include <sys/dir.h>
#endif
#include <net/bpf.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/tcp.h>
#include "ipsend.h"
#if !defined(lint)
static const char sccsid[] = "@(#)sbpf.c 1.3 8/25/95 (C)1995 Darren Reed";
static const char rcsid[] = "@(#)$Id: sbpf.c,v 2.1.4.2 2001/09/30 04:04:28 darrenr Exp $";
#endif
/*
* the code herein is dervied from libpcap.
*/
static u_char *buf = NULL;
static int bufsize = 0, timeout = 1;
int initdevice(device, sport, tout)
char *device;
int sport, tout;
{
struct bpf_version bv;
struct timeval to;
struct ifreq ifr;
char bpfname[16];
int fd, i;
fd = -1;
for (i = 0; i < 16; i++)
{
(void) sprintf(bpfname, "/dev/bpf%d", i);
if ((fd = open(bpfname, O_RDWR)) >= 0)
break;
}
if (i == 16)
{
fprintf(stderr, "no bpf devices available as /dev/bpfxx\n");
return -1;
}
if (ioctl(fd, BIOCVERSION, (caddr_t)&bv) < 0)
{
perror("BIOCVERSION");
return -1;
}
if (bv.bv_major != BPF_MAJOR_VERSION ||
bv.bv_minor < BPF_MINOR_VERSION)
{
fprintf(stderr, "kernel bpf (v%d.%d) filter out of date:\n",
bv.bv_major, bv.bv_minor);
fprintf(stderr, "current version: %d.%d\n",
BPF_MAJOR_VERSION, BPF_MINOR_VERSION);
return -1;
}
(void) strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
if (ioctl(fd, BIOCSETIF, &ifr) == -1)
{
fprintf(stderr, "%s(%d):", ifr.ifr_name, fd);
perror("BIOCSETIF");
exit(1);
}
/*
* get kernel buffer size
*/
if (ioctl(fd, BIOCGBLEN, &bufsize) == -1)
{
perror("BIOCSBLEN");
exit(-1);
}
buf = (u_char*)malloc(bufsize);
/*
* set the timeout
*/
timeout = tout;
to.tv_sec = 1;
to.tv_usec = 0;
if (ioctl(fd, BIOCSRTIMEOUT, (caddr_t)&to) == -1)
{
perror("BIOCSRTIMEOUT");
exit(-1);
}
(void) ioctl(fd, BIOCFLUSH, 0);
return fd;
}
/*
* output an IP packet onto a fd opened for /dev/bpf
*/
int sendip(fd, pkt, len)
int fd, len;
char *pkt;
{
if (write(fd, pkt, len) == -1)
{
perror("send");
return -1;
}
return len;
}
|