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90 fprintf(stderr, "kernel bpf (v%d.%d) filter out of date:\n",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