interfaces.c

eCos操作系统源码

        
    /* 
     * This assumes that the table is a 'simple' table.
     *	See the implementation documentation for the meaning of this.
     *	You will need to provide the correct value for the TABLE_SIZE parameter
     *
     * If this table does not meet the requirements for a simple table,
     * you will need to provide the replacement code yourself.
     * Mib2c is not smart enough to write this for you.
     * Again, see the implementation documentation for what is required.
     */
    if ( header_simple_table( vp,name,length,exact,var_len,write_method,
                              interface_count)
         == MATCH_FAILED )
        return NULL;
    
    if_num = name[ (*length)-1 ];
    
    ifp = cyg_snmp_get_if(if_num);
    if (!ifp)
      return NULL;

// This is to assist customers with their own special interfaces; if they
// define IFT_CUSTOMER_SPECIAL to whatever their own device is, then its
// ioctl() will be called to handle these enquiries.
#ifdef IFT_CUSTOMER_SPECIAL
    if ( (ifp->if_type == IFT_CUSTOMER_SPECIAL) && (NULL != ifp->if_ioctl) )
    {
       if( (vp->magic == IFDESCR) || (vp->magic == IFPHYSADDRESS) )
       {
            (*ifp->if_ioctl)(ifp, vp->magic, (caddr_t)string);
	    *var_len = strlen(string);
	    return (unsigned char *) string;
       }
       else
       {
            (*ifp->if_ioctl)(ifp, vp->magic, (caddr_t)&long_ret);
	    return (unsigned char *) &long_ret;
       }
    }
#endif // IFT_CUSTOMER_SPECIAL

    if ( IFT_ETHER == ifp->if_type &&
         ((IFDESCR == vp->magic) ||
          (IFSPEED == vp->magic) ||
          (IFOUTDISCARDS == vp->magic) ||
          (IFOUTQLEN == vp->magic) )
        ) {
        // then acquire up to date information and deal with the relevent
        // keys (only):
        int i = -1;
        struct ether_drv_stats x;
        bzero( &x, sizeof( x ) );

        // Call the ioctl to get all the info.
        // (We KNOW it's an ether dev here, it should have an ioctl())
        if ( NULL != ifp->if_ioctl )
            i = (*ifp->if_ioctl)(ifp, SIOCGIFSTATSUD, (caddr_t)&x);

        switch(vp->magic) {
        case IFDESCR:
            if ( i || 0 == x.description[0] ) 
                strcpy( string, "<Ethernet, details not available>" );
            else
                strcpy( string, x.description );
            *var_len = strlen(string);
            return (unsigned char *) string;

        case IFSPEED:
            long_ret = x.speed;
            return (unsigned char *) &long_ret;

        case IFOUTDISCARDS:
            long_ret = x.tx_dropped;
            return (unsigned char *) &long_ret;

        case IFOUTQLEN:
            long_ret = x.tx_queue_len;
            return (unsigned char *) &long_ret;

        default:
            CYG_FAIL( "Bad magic; shouldn't be in here" );
            break;
        }
    }

    switch(vp->magic) {
    
    case IFINDEX:
        long_ret = name[(*length)-1];
        return (unsigned char *) &long_ret;
        
    case IFDESCR:
        switch ( ifp->if_type ) {
        case IFT_LOOP:
            strcpy( string, "(Loopback device)" );
            break;
        case IFT_PROPVIRTUAL:
            strcpy( string, "(Proprietary Virtual/Internal)" );
            break;
        default:
            strcpy( string, "Some shy network adaptor" );
            break;
        }
        *var_len = strlen(string);
        return (unsigned char *) string;

    case IFTYPE:
        long_ret = ifp->if_type;
        return (unsigned char *) &long_ret;

    case IFMTU:
        long_ret = ifp->if_mtu;
        return (unsigned char *) &long_ret;
        
    case IFSPEED:
        if ( IFT_LOOP == ifp->if_type )
            long_ret = 0;
        else
            long_ret = ifp->if_baudrate;
        return (unsigned char *) &long_ret;

    case IFPHYSADDRESS: {
        if ( IFT_ETHER == ifp->if_type ) {
            struct arpcom *ac = (struct arpcom *)ifp;
            bcopy(&ac->ac_enaddr, string, ETHER_ADDR_LEN);
        }
        else {
            bzero( string, ETHER_ADDR_LEN );
        }
        *var_len = ETHER_ADDR_LEN;
        return (unsigned char *) string;
    }
    case IFADMINSTATUS:
        //NOTSUPPORTED: *write_method = write_ifAdminStatus;
        long_ret = (ifp->if_flags & IFF_RUNNING) ? 1 : 2;
        return (unsigned char *) &long_ret;

    case IFOPERSTATUS:
        long_ret = (ifp->if_flags & IFF_UP) ? 1 : 2;
        return (unsigned char *) &long_ret;

    case IFLASTCHANGE:
        long_ret = 0; //FIXME: ifp->if_lastchange;
        return (unsigned char *) &long_ret;

    case IFINOCTETS:
        long_ret = ifp->if_ibytes;
        return (unsigned char *) &long_ret;

    case IFINUCASTPKTS:
        long_ret = ifp->if_ipackets - ifp->if_imcasts;
        return (unsigned char *) &long_ret;

    case IFINNUCASTPKTS:
        long_ret = ifp->if_imcasts;
        return (unsigned char *) &long_ret;

    case IFINDISCARDS:
        long_ret = ifp->if_iqdrops;
        return (unsigned char *) &long_ret;

    case IFINERRORS:
        long_ret = ifp->if_ierrors;
        return (unsigned char *) &long_ret;

    case IFINUNKNOWNPROTOS:
        long_ret = ifp->if_noproto;
        return (unsigned char *) &long_ret;

    case IFOUTOCTETS:
        long_ret = ifp->if_obytes;
        return (unsigned char *) &long_ret;

    case IFOUTUCASTPKTS:
        long_ret = ifp->if_opackets - ifp->if_omcasts;
        return (unsigned char *) &long_ret;

    case IFOUTNUCASTPKTS:
        long_ret = ifp->if_omcasts;
        return (unsigned char *) &long_ret;

    case IFOUTDISCARDS:
        long_ret = 0; // ETHER case dealt with above
        return (unsigned char *) &long_ret;

    case IFOUTERRORS:
        long_ret = ifp->if_oerrors;
        return (unsigned char *) &long_ret;

    case IFOUTQLEN:
        long_ret = 0; // ETHER case dealt with above
        return (unsigned char *) &long_ret;

    case IFSPECIFIC:
        objid[0] = 0;
        objid[1] = 0;
        *var_len = 2*sizeof(oid);
        return (unsigned char *) objid;
        
    default:
        ERROR_MSG("");
    }
    return NULL;
}



//NOTSUPPORTED: 
#if 0
int
write_ifAdminStatus(int      action,
            u_char   *var_val,
            u_char   var_val_type,
            size_t   var_val_len,
            u_char   *statP,
            oid      *name,
            size_t   name_len)
{
  static long *long_ret;
  int size;


  switch ( action ) {
        case RESERVE1:
          if (var_val_type != ASN_INTEGER){
              fprintf(stderr, "write to ifAdminStatus not ASN_INTEGER\n");
              return SNMP_ERR_WRONGTYPE;
          }
          if (var_val_len > sizeof(long_ret)){
              fprintf(stderr,"write to ifAdminStatus: bad length\n");
              return SNMP_ERR_WRONGLENGTH;
          }
          break;


        case RESERVE2:
          size = var_val_len;
          long_ret = (long *) var_val;


          break;


        case FREE:
             /* Release any resources that have been allocated */
          break;


        case ACTION:
             /* The variable has been stored in long_ret for you to use,
             and you have just been asked to do something with it.  Note
             that anything done here must be reversable in the UNDO case */
          break;


        case UNDO:
             /* Back out any changes made in the ACTION case */
          break;


        case COMMIT:
             /* Things are working well, so it's now safe to make the change
             permanently.  Make sure that anything done here can't fail! */
          break;
  }
  return SNMP_ERR_NOERROR;
}

#endif

// EOF interfaces.c