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Annotation of embedaddon/libnet/src/libnet_link_snit.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  *  $Id: libnet_link_snit.c,v 1.6 2004/01/03 20:31:02 mike 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 u_int8_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: }