dist/ipf/ipsend/snit.c

   1 /*      $NetBSD$        */
   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 2.3 2001/06/09 17:09:26 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 }