snit.c revision 80486 
1/*
2 * (C)opyright 1992-1998 Darren Reed. (from tcplog)
3 *
4 * See the IPFILTER.LICENCE file for details on licencing.
5 */
6
7#include <stdio.h>
8#include <netdb.h>
9#include <ctype.h>
10#include <signal.h>
11#include <errno.h>
12#include <sys/types.h>
13#include <sys/time.h>
14#include <sys/timeb.h>
15#include <sys/socket.h>
16#include <sys/file.h>
17#include <sys/ioctl.h>
18#include <net/nit.h>
19#include <sys/fcntlcom.h>
20#include <sys/dir.h>
21#include <net/nit_if.h>
22#include <net/nit_pf.h>
23#include <net/nit_buf.h>
24#include <net/packetfilt.h>
25#include <sys/stropts.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/if_ether.h>
32#include <netinet/ip_var.h>
33#include <netinet/udp.h>
34#include <netinet/udp_var.h>
35#include <netinet/tcp.h>
36
37#include "ipsend.h"
38
39#if !defined(lint)
40static const char sccsid[] = "@(#)snit.c	1.5 1/11/96 (C)1995 Darren Reed";
41static const char rcsid[] = "@(#)$Id: snit.c,v 2.1.4.1 2001/06/26 10:43:22 darrenr Exp $";
42#endif
43
44#define	CHUNKSIZE	8192
45#define BUFSPACE	(4*CHUNKSIZE)
46
47/*
48 * Be careful to only include those defined in the flags option for the
49 * interface are included in the header size.
50 */
51#define BUFHDR_SIZE  (sizeof(struct nit_bufhdr))
52#define NIT_HDRSIZE  (BUFHDR_SIZE)
53
54static	int	timeout;
55
56
57int	initdevice(device, sport, tout)
58char	*device;
59int	sport, tout;
60{
61	struct	strioctl si;
62	struct	timeval to;
63	struct	ifreq ifr;
64	int	fd;
65
66	if ((fd = open("/dev/nit", O_RDWR)) < 0)
67	    {
68		perror("/dev/nit");
69		exit(-1);
70	    }
71
72	/*
73	 * arrange to get messages from the NIT STREAM and use NIT_BUF option
74	 */
75	ioctl(fd, I_SRDOPT, (char*)RMSGD);
76	ioctl(fd, I_PUSH, "nbuf");
77
78	/*
79	 * set the timeout
80	 */
81	timeout = tout;
82	si.ic_timout = 1;
83	to.tv_sec = 1;
84	to.tv_usec = 0;
85	si.ic_cmd = NIOCSTIME;
86	si.ic_len = sizeof(to);
87	si.ic_dp = (char*)&to;
88	if (ioctl(fd, I_STR, (char*)&si) == -1)
89	    {
90		perror("ioctl: NIT timeout");
91		exit(-1);
92	    }
93
94	/*
95	 * request the interface
96	 */
97	strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
98	ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = ' ';
99	si.ic_cmd = NIOCBIND;
100	si.ic_len = sizeof(ifr);
101	si.ic_dp = (char*)&ifr;
102	if (ioctl(fd, I_STR, (char*)&si) == -1)
103	    {
104		perror(ifr.ifr_name);
105		exit(1);
106	    }
107	return fd;
108}
109
110
111/*
112 * output an IP packet onto a fd opened for /dev/nit
113 */
114int	sendip(fd, pkt, len)
115int	fd, len;
116char	*pkt;
117{
118	struct	sockaddr sk, *sa = &sk;
119	struct	strbuf	cbuf, *cp = &cbuf, dbuf, *dp = &dbuf;
120
121	/*
122	 * For ethernet, need at least 802.3 header and IP header.
123	 */
124	if (len < (sizeof(sa->sa_data) + sizeof(struct ip)))
125		return -1;
126	/*
127	 * to avoid any output processing for IP, say we're not.
128	 */
129	sa->sa_family = AF_UNSPEC;
130	bcopy(pkt, sa->sa_data, sizeof(sa->sa_data));
131	pkt += sizeof(sa->sa_data);
132	len -= sizeof(sa->sa_data);
133
134	/*
135	 * construct NIT STREAMS messages, first control then data.
136	 */
137	cp->len = sizeof(*sa);
138	cp->maxlen = sizeof(*sa);
139	cp->buf = (char *)sa;
140
141	dp->buf = pkt;
142	dp->len = len;
143	dp->maxlen = dp->len;
144
145	if (putmsg(fd, cp, dp, 0) == -1)
146	    {
147		perror("putmsg");
148		return -1;
149	    }
150
151	if (ioctl(fd, I_FLUSH, FLUSHW) == -1)
152	    {
153		perror("I_FLUSH");
154		return -1;
155	    }
156	return len;
157}
158