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      1 /*	$NetBSD: snit.c,v 1.2 2012/07/22 14:27:36 darrenr Exp $	*/
      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)
     43 static const char sccsid[] = "@(#)snit.c	1.5 1/11/96 (C)1995 Darren Reed";
     44 static const char rcsid[] = "@(#)Id: snit.c,v 1.1.1.2 2012/07/22 13:44:37 darrenr Exp $";
     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 
     57 static	int	timeout;
     58 
     59 
     60 int	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  */
    117 int	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