snit.c revision 53024 
1/*
2 * (C)opyright 1992-1998 Darren Reed. (from tcplog)
3 *
4 * Redistribution and use in source and binary forms are permitted
5 * provided that this notice is preserved and due credit is given
6 * to the original author and the contributors.
7 */
8
9#include <stdio.h>
10#include <netdb.h>
11#include <ctype.h>
12#include <signal.h>
13#include <errno.h>
14#include <sys/types.h>
15#include <sys/time.h>
16#include <sys/timeb.h>
17#include <sys/socket.h>
18#include <sys/file.h>
19#include <sys/ioctl.h>
20#include <net/nit.h>
21#include <sys/fcntlcom.h>
22#include <sys/dir.h>
23#include <net/nit_if.h>
24#include <net/nit_pf.h>
25#include <net/nit_buf.h>
26#include <net/packetfilt.h>
27#include <sys/stropts.h>
28
29#include <net/if.h>
30#include <netinet/in.h>
31#include <netinet/in_systm.h>
32#include <netinet/ip.h>
33#include <netinet/if_ether.h>
34#include <netinet/ip_var.h>
35#include <netinet/udp.h>
36#include <netinet/udp_var.h>
37#include <netinet/tcp.h>
38
39#include "ipsend.h"
40
41#if !defined(lint)
42static const char sccsid[] = "@(#)snit.c	1.5 1/11/96 (C)1995 Darren Reed";
43static const char rcsid[] = "@(#)$Id: snit.c,v 2.1 1999/08/04 17:31:15 darrenr Exp $";
44#endif
45
46#define	CHUNKSIZE	8192
47#define BUFSPACE	(4*CHUNKSIZE)
48
49/*
50 * Be careful to only include those defined in the flags option for the
51 * interface are included in the header size.
52 */
53#define BUFHDR_SIZE  (sizeof(struct nit_bufhdr))
54#define NIT_HDRSIZE  (BUFHDR_SIZE)
55
56static	int	timeout;
57
58
59int	initdevice(device, sport, tout)
60char	*device;
61int	sport, tout;
62{
63	struct	strioctl si;
64	struct	timeval to;
65	struct	ifreq ifr;
66	int	fd;
67
68	if ((fd = open("/dev/nit", O_RDWR)) < 0)
69	    {
70		perror("/dev/nit");
71		exit(-1);
72	    }
73
74	/*
75	 * arrange to get messages from the NIT STREAM and use NIT_BUF option
76	 */
77	ioctl(fd, I_SRDOPT, (char*)RMSGD);
78	ioctl(fd, I_PUSH, "nbuf");
79
80	/*
81	 * set the timeout
82	 */
83	timeout = tout;
84	si.ic_timout = 1;
85	to.tv_sec = 1;
86	to.tv_usec = 0;
87	si.ic_cmd = NIOCSTIME;
88	si.ic_len = sizeof(to);
89	si.ic_dp = (char*)&to;
90	if (ioctl(fd, I_STR, (char*)&si) == -1)
91	    {
92		perror("ioctl: NIT timeout");
93		exit(-1);
94	    }
95
96	/*
97	 * request the interface
98	 */
99	strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
100	ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = ' ';
101	si.ic_cmd = NIOCBIND;
102	si.ic_len = sizeof(ifr);
103	si.ic_dp = (char*)&ifr;
104	if (ioctl(fd, I_STR, (char*)&si) == -1)
105	    {
106		perror(ifr.ifr_name);
107		exit(1);
108	    }
109	return fd;
110}
111
112
113/*
114 * output an IP packet onto a fd opened for /dev/nit
115 */
116int	sendip(fd, pkt, len)
117int	fd, len;
118char	*pkt;
119{
120	struct	sockaddr sk, *sa = &sk;
121	struct	strbuf	cbuf, *cp = &cbuf, dbuf, *dp = &dbuf;
122
123	/*
124	 * For ethernet, need at least 802.3 header and IP header.
125	 */
126	if (len < (sizeof(sa->sa_data) + sizeof(struct ip)))
127		return -1;
128	/*
129	 * to avoid any output processing for IP, say we're not.
130	 */
131	sa->sa_family = AF_UNSPEC;
132	bcopy(pkt, sa->sa_data, sizeof(sa->sa_data));
133	pkt += sizeof(sa->sa_data);
134	len -= sizeof(sa->sa_data);
135
136	/*
137	 * construct NIT STREAMS messages, first control then data.
138	 */
139	cp->len = sizeof(*sa);
140	cp->maxlen = sizeof(*sa);
141	cp->buf = (char *)sa;
142
143	dp->buf = pkt;
144	dp->len = len;
145	dp->maxlen = dp->len;
146
147	if (putmsg(fd, cp, dp, 0) == -1)
148	    {
149		perror("putmsg");
150		return -1;
151	    }
152
153	if (ioctl(fd, I_FLUSH, FLUSHW) == -1)
154	    {
155		perror("I_FLUSH");
156		return -1;
157	    }
158	return len;
159}
160