1/*	$FreeBSD$	*/
2
3/*
4 * (C)opyright 1992-1998 Darren Reed. (from tcplog)
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 *
8 */
9
10#include <stdio.h>
11#include <netdb.h>
12#include <ctype.h>
13#include <signal.h>
14#include <errno.h>
15#include <sys/types.h>
16#include <sys/time.h>
17#include <sys/timeb.h>
18#include <sys/socket.h>
19#include <sys/file.h>
20#include <sys/ioctl.h>
21#include <net/nit.h>
22#include <sys/fcntlcom.h>
23#include <sys/dir.h>
24#include <net/nit_if.h>
25#include <net/nit_pf.h>
26#include <net/nit_buf.h>
27#include <net/packetfilt.h>
28#include <sys/stropts.h>
29
30#include <net/if.h>
31#include <netinet/in.h>
32#include <netinet/in_systm.h>
33#include <netinet/ip.h>
34#include <netinet/if_ether.h>
35#include <netinet/ip_var.h>
36#include <netinet/udp.h>
37#include <netinet/udp_var.h>
38#include <netinet/tcp.h>
39
40#include "ipsend.h"
41
42#if !defined(lint)
43static const char sccsid[] = "@(#)snit.c	1.5 1/11/96 (C)1995 Darren Reed";
44static const char rcsid[] = "@(#)$Id$";
45#endif
46
47#define	CHUNKSIZE	8192
48#define BUFSPACE	(4*CHUNKSIZE)
49
50/*
51 * Be careful to only include those defined in the flags option for the
52 * interface are included in the header size.
53 */
54#define BUFHDR_SIZE  (sizeof(struct nit_bufhdr))
55#define NIT_HDRSIZE  (BUFHDR_SIZE)
56
57static	int	timeout;
58
59
60int	initdevice(device, tout)
61	char	*device;
62	int	tout;
63{
64	struct	strioctl si;
65	struct	timeval to;
66	struct	ifreq ifr;
67	int	fd;
68
69	if ((fd = open("/dev/nit", O_RDWR)) < 0)
70	    {
71		perror("/dev/nit");
72		exit(-1);
73	    }
74
75	/*
76	 * arrange to get messages from the NIT STREAM and use NIT_BUF option
77	 */
78	ioctl(fd, I_SRDOPT, (char*)RMSGD);
79	ioctl(fd, I_PUSH, "nbuf");
80
81	/*
82	 * set the timeout
83	 */
84	timeout = tout;
85	si.ic_timout = 1;
86	to.tv_sec = 1;
87	to.tv_usec = 0;
88	si.ic_cmd = NIOCSTIME;
89	si.ic_len = sizeof(to);
90	si.ic_dp = (char*)&to;
91	if (ioctl(fd, I_STR, (char*)&si) == -1)
92	    {
93		perror("ioctl: NIT timeout");
94		exit(-1);
95	    }
96
97	/*
98	 * request the interface
99	 */
100	strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
101	ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = ' ';
102	si.ic_cmd = NIOCBIND;
103	si.ic_len = sizeof(ifr);
104	si.ic_dp = (char*)&ifr;
105	if (ioctl(fd, I_STR, (char*)&si) == -1)
106	    {
107		perror(ifr.ifr_name);
108		exit(1);
109	    }
110	return fd;
111}
112
113
114/*
115 * output an IP packet onto a fd opened for /dev/nit
116 */
117int	sendip(fd, pkt, len)
118	int	fd, len;
119	char	*pkt;
120{
121	struct	sockaddr sk, *sa = &sk;
122	struct	strbuf	cbuf, *cp = &cbuf, dbuf, *dp = &dbuf;
123
124	/*
125	 * For ethernet, need at least 802.3 header and IP header.
126	 */
127	if (len < (sizeof(sa->sa_data) + sizeof(struct ip)))
128		return -1;
129	/*
130	 * to avoid any output processing for IP, say we're not.
131	 */
132	sa->sa_family = AF_UNSPEC;
133	bcopy(pkt, sa->sa_data, sizeof(sa->sa_data));
134	pkt += sizeof(sa->sa_data);
135	len -= sizeof(sa->sa_data);
136
137	/*
138	 * construct NIT STREAMS messages, first control then data.
139	 */
140	cp->len = sizeof(*sa);
141	cp->maxlen = sizeof(*sa);
142	cp->buf = (char *)sa;
143
144	dp->buf = pkt;
145	dp->len = len;
146	dp->maxlen = dp->len;
147
148	if (putmsg(fd, cp, dp, 0) == -1)
149	    {
150		perror("putmsg");
151		return -1;
152	    }
153
154	if (ioctl(fd, I_FLUSH, FLUSHW) == -1)
155	    {
156		perror("I_FLUSH");
157		return -1;
158	    }
159	return len;
160}
161