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1.1.6

    1: /*
    2:  *  $Id: libnet_link_snit.c,v 1.1.1.2 2013/07/22 11:54:42 misho Exp $
    3:  *
    4:  *  libnet
    5:  *  libnet_snit.c - snit routines
    6:  *
    7:  *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
    8:  *  All rights reserved.
    9:  *
   10:  * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996
   11:  *	The Regents of the University of California.  All rights reserved.
   12:  *
   13:  * Redistribution and use in source and binary forms, with or without
   14:  * modification, are permitted provided that: (1) source code distributions
   15:  * retain the above copyright notice and this paragraph in its entirety, (2)
   16:  * distributions including binary code include the above copyright notice and
   17:  * this paragraph in its entirety in the documentation or other materials
   18:  * provided with the distribution, and (3) all advertising materials mentioning
   19:  * features or use of this software display the following acknowledgement:
   20:  * ``This product includes software developed by the University of California,
   21:  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
   22:  * the University nor the names of its contributors may be used to endorse
   23:  * or promote products derived from this software without specific prior
   24:  * written permission.
   25:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
   26:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
   27:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
   28:  *
   29:  * Modifications made to accommodate the new SunOS4.0 NIT facility by
   30:  * Micky Liu, micky@cunixc.cc.columbia.edu, Columbia University in May, 1989.
   31:  * This module now handles the STREAMS based NIT.
   32:  */
   33: 
   34: #if (HAVE_CONFIG_H)
   35: #include "../include/config.h"
   36: #endif
   37: #if (!(_WIN32) || (__CYGWIN__)) 
   38: #include "../include/libnet.h"
   39: #else
   40: #include "../include/win32/libnet.h"
   41: #endif
   42: #include "../include/gnuc.h"
   43: #ifdef HAVE_OS_PROTO_H
   44: #include "../include/os-proto.h"
   45: #endif
   46: 
   47: 
   48: struct libnet_link_int *
   49: libnet_open_link_interface(int8_t *device, int8_t *ebuf)
   50: {
   51:     struct strioctl si;	    /* struct for ioctl() */
   52:     struct ifreq ifr;       /* interface request struct */
   53:     static int8_t dev[] = "/dev/nit";
   54:     register struct libnet_link_int *l;
   55: 
   56:     l = (struct libnet_link_int *)malloc(sizeof(*l));
   57:     if (l == NULL)
   58:     {
   59:         strcpy(ebuf, strerror(errno));
   60:         return (NULL);
   61:     }
   62: 
   63:     memset(l, 0, sizeof(*l));
   64: 
   65:     l->fd  = open(dev, O_RDWR);
   66:     if (l->fd < 0)
   67:     {
   68:         sprintf(ebuf, "%s: %s", dev, strerror(errno));
   69:         goto bad;
   70:     }
   71: 
   72:     /*
   73:      *  arrange to get discrete messages from the STREAM and use NIT_BUF
   74:      */
   75:     if (ioctl(l->fd, I_SRDOPT, (int8_t *)RMSGD) < 0)
   76:     {
   77:         sprintf(ebuf, "I_SRDOPT: %s", strerror(errno));
   78:         goto bad;
   79:     }
   80:     if (ioctl(l->fd, I_PUSH, "nbuf") < 0)
   81:     {
   82:         sprintf(ebuf, "push nbuf: %s", strerror(errno));
   83:         goto bad;
   84:     }
   85:     /*
   86:      *  request the interface
   87:      */
   88:     strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name) -1);
   89:     ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = '\0';
   90:     si.ic_cmd = NIOCBIND;
   91:     si.ic_len = sizeof(ifr);
   92:     si.ic_dp = (int8_t *)&ifr;
   93:     if (ioctl(l->fd, I_STR, (int8_t *)&si) < 0)
   94:     {
   95:         sprintf(ebuf, "NIOCBIND: %s: %s", ifr.ifr_name, strerror(errno));
   96:         goto bad;
   97:     }
   98: 
   99:     ioctl(l->fd, I_FLUSH, (int8_t *)FLUSHR);
  100:     /*
  101:      * NIT supports only ethernets.
  102:      */
  103:     l->linktype = DLT_EN10MB;
  104: 
  105:     return (l);
  106: bad:
  107:     if (l->fd >= 0)
  108:     {
  109:         close(l->fd);
  110:     }
  111:     free(l);
  112:     return (NULL);
  113: }
  114: 
  115: 
  116: int
  117: libnet_close_link_interface(struct libnet_link_int *l)
  118: {
  119:     if (close(l->fd) == 0)
  120:     {
  121:         free(l);
  122:         return (1);
  123:     }
  124:     else
  125:     {
  126:         free(l);
  127:         return (-1);
  128:     }
  129: }
  130: 
  131: 
  132: int
  133: libnet_write_link_layer(struct libnet_link_int *l, const int8_t *device,
  134:             const uint8_t *buf, int len)
  135: {
  136:     int c;
  137:     struct sockaddr sa;
  138: 
  139:     memset(&sa, 0, sizeof(sa));
  140:     strncpy(sa.sa_data, device, sizeof(sa.sa_data));
  141: 
  142:     c = sendto(l->fd, buf, len, 0, &sa, sizeof(sa));
  143:     if (c != len)
  144:     {
  145:         /* err */
  146:         return (-1);
  147:     }
  148:     return (c);
  149: }