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//==========================================================================

//

//      ./lib/current/src/snmp.c

//

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//####UCDSNMPCOPYRIGHTBEGIN####

//

// -------------------------------------------

//

// Portions of this software may have been derived from the UCD-SNMP

// project,  <http://ucd-snmp.ucdavis.edu/>  from the University of

// California at Davis, which was originally based on the Carnegie Mellon

// University SNMP implementation.  Portions of this software are therefore

// covered by the appropriate copyright disclaimers included herein.

//

// The release used was version 4.1.2 of May 2000.  "ucd-snmp-4.1.2"

// -------------------------------------------

//

//####UCDSNMPCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    hmt

// Contributors: hmt

// Date:         2000-05-30

// Purpose:      Port of UCD-SNMP distribution to eCos.

// Description:  

//              

//

//####DESCRIPTIONEND####

//

//==========================================================================

/********************************************************************

       Copyright 1989, 1991, 1992 by Carnegie Mellon University

                          Derivative Work -

Copyright 1996, 1998, 1999, 2000 The Regents of the University of California

                         All Rights Reserved

Permission to use, copy, modify and distribute this software and its

documentation for any purpose and without fee is hereby granted,

provided that the above copyright notice appears in all copies and

that both that copyright notice and this permission notice appear in

supporting documentation, and that the name of CMU and The Regents of

the University of California not be used in advertising or publicity

pertaining to distribution of the software without specific written

permission.

CMU AND THE REGENTS OF THE UNIVERSITY OF CALIFORNIA DISCLAIM ALL

WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED

WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL CMU OR

THE REGENTS OF THE UNIVERSITY OF CALIFORNIA BE LIABLE FOR ANY SPECIAL,

INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING

FROM THE LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF

CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN

CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

*********************************************************************/

/*

 * Simple Network Management Protocol (RFC 1067).

 *

 */

/**********************************************************************

        Copyright 1988, 1989, 1991, 1992 by Carnegie Mellon University

                      All Rights Reserved

Permission to use, copy, modify, and distribute this software and its

documentation for any purpose and without fee is hereby granted,

provided that the above copyright notice appear in all copies and that

both that copyright notice and this permission notice appear in

supporting documentation, and that the name of CMU not be

used in advertising or publicity pertaining to distribution of the

software without specific, written prior permission.

CMU DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING

ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL

CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR

ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,

WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,

ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS

SOFTWARE.

******************************************************************/

#include <config.h>

#include <ctype.h>

#ifdef KINETICS

#include "gw.h"

#include "ab.h"

#include "inet.h"

#include "fp4/cmdmacro.h"

#include "fp4/pbuf.h"

#include "glob.h"

#endif

#include <stdio.h>

#include <stdlib.h>

#include <sys/types.h>

#ifdef HAVE_STRING_H

#include <string.h>

#else

#include <strings.h>

#endif

#if HAVE_NETINET_IN_H

#include <netinet/in.h>

#endif

#ifdef HAVE_SYS_SELECT_H

#include <sys/select.h>

#endif

#if HAVE_WINSOCK_H

#include <winsock.h>

#endif

#ifndef NULL

#define NULL 0

#endif

#if HAVE_DMALLOC_H

#include <dmalloc.h>

#endif

#ifdef vms

#include <in.h>

#endif

#include "asn1.h"

#include "snmp.h"

#include "snmp_api.h"

#include "snmp_impl.h"

#include "snmp_logging.h"

#include "mib.h"

void

xdump(const u_char *cp,

      size_t length,

      const char *prefix)

{

    int col, count;

    char *buffer;

    buffer=(char *)malloc(strlen(prefix)+80);

    if (!buffer) {

      snmp_log(LOG_NOTICE, "xdump: malloc failed. packet-dump skipped\n");

      return;

    }

    count = 0;

    while(count < (int)length){

        strcpy(buffer, prefix);

        sprintf (buffer+strlen(buffer), "%.4d: ", count);

        for(col = 0; ((count + col) < (int)length) && col < 16; col++){

            sprintf(buffer+strlen(buffer), "%02X ", cp[count + col]);

            if (col % 4 == 3) strcat(buffer, " ");

        }

        for(;col < 16;col++){   /* pad end of buffer with zeros */

            strcat(buffer, "   ");

            if (col % 4 == 3) strcat(buffer, " ");

        }

        strcat(buffer, "  ");

        for(col = 0; ((count + col) < (int)length) && col < 16; col++){

            buffer[col+60]=isprint(cp[count+col])?cp[count+col]:'.';

        }

        buffer[col+60]='\n';

        buffer[col+60+1]=0;

        snmp_log(LOG_DEBUG, "%s", buffer);

        count += col;

    }

    snmp_log(LOG_DEBUG, "\n");

    free(buffer);

}  /* end xdump() */

/*

   u_char * snmp_parse_var_op(

   u_char *data              IN - pointer to the start of object

   oid *var_name             OUT - object id of variable

   int *var_name_len         IN/OUT - length of variable name

   u_char *var_val_type      OUT - type of variable (int or octet string) (one byte)

   int *var_val_len          OUT - length of variable

   u_char **var_val          OUT - pointer to ASN1 encoded value of variable

   int *listlength          IN/OUT - number of valid bytes left in var_op_list

*/

u_char *

snmp_parse_var_op(u_char *data,

                  oid *var_name,

                  size_t *var_name_len,

                  u_char *var_val_type,

                  size_t *var_val_len,

                  u_char **var_val,

                  size_t *listlength)

{

    u_char          var_op_type;

    size_t                  var_op_len = *listlength;

    u_char          *var_op_start = data;

    data = asn_parse_sequence(data, &var_op_len, &var_op_type,

                        (ASN_SEQUENCE | ASN_CONSTRUCTOR), "var_op");

    if (data == NULL){

        /* msg detail is set */

        return NULL;

    }

    data = asn_parse_objid(data, &var_op_len, &var_op_type, var_name, var_name_len);

    if (data == NULL){

        ERROR_MSG("No OID for variable");

        return NULL;

    }

    if (var_op_type != (u_char)(ASN_UNIVERSAL | ASN_PRIMITIVE | ASN_OBJECT_ID))

        return NULL;

    *var_val = data;    /* save pointer to this object */

    /* find out what type of object this is */

    data = asn_parse_header(data, &var_op_len, var_val_type);

    if (data == NULL){

        ERROR_MSG("No header for value");

        return NULL;

    }

    /* XXX no check for type! */

    *var_val_len = var_op_len;

    data += var_op_len;

    *listlength -= (int)(data - var_op_start);

    return data;

}

/*

        u_char * snmp_build_var_op(

        u_char *data         IN - pointer to the beginning of the output buffer

        oid *var_name        IN - object id of variable

        int *var_name_len    IN - length of object id

        u_char var_val_type  IN - type of variable

        int    var_val_len   IN - length of variable

        u_char *var_val      IN - value of variable

        int *listlength      IN/OUT - number of valid bytes left in

                                   output buffer

*/

u_char *

snmp_build_var_op(u_char *data,

                  oid *var_name,

                  size_t *var_name_len,

                  u_char var_val_type,

                  size_t var_val_len,

                  u_char *var_val,

                  size_t *listlength)

{

    size_t     dummyLen, headerLen;

    u_char    *dataPtr;

    dummyLen = *listlength;

    dataPtr = data;

#if 0

    data = asn_build_sequence(data, &dummyLen,

                              (u_char)(ASN_SEQUENCE | ASN_CONSTRUCTOR), 0);

    if (data == NULL){

        return NULL;

    }

#endif

    if (dummyLen < 4)

        return NULL;

    data += 4;

    dummyLen -=4;

    headerLen = data - dataPtr;

    *listlength -= headerLen;

    data = asn_build_objid(data, listlength,

            (u_char)(ASN_UNIVERSAL | ASN_PRIMITIVE | ASN_OBJECT_ID),

            var_name, *var_name_len);

    if (data == NULL){

        ERROR_MSG("Can't build OID for variable");

        return NULL;

    }

    switch(var_val_type){

        case ASN_INTEGER:

            data = asn_build_int(data, listlength, var_val_type,

                    (long *)var_val, var_val_len);

            break;

        case ASN_GAUGE:

        case ASN_COUNTER:

        case ASN_TIMETICKS:

        case ASN_UINTEGER:

            data = asn_build_unsigned_int(data, listlength, var_val_type,

                                          (u_long *)var_val, var_val_len);

            break;

#ifdef OPAQUE_SPECIAL_TYPES

        case ASN_OPAQUE_COUNTER64:

        case ASN_OPAQUE_U64:

#endif

        case ASN_COUNTER64:

            data = asn_build_unsigned_int64(data, listlength, var_val_type,

                                           (struct counter64 *)var_val,

                                            var_val_len);

            break;

        case ASN_OCTET_STR:

        case ASN_IPADDRESS:

        case ASN_OPAQUE:

        case ASN_NSAP:

            data = asn_build_string(data, listlength, var_val_type,

                    var_val, var_val_len);

            break;

        case ASN_OBJECT_ID:

            data = asn_build_objid(data, listlength, var_val_type,

                    (oid *)var_val, var_val_len / sizeof(oid));

            break;

        case ASN_NULL:

            data = asn_build_null(data, listlength, var_val_type);

            break;

        case ASN_BIT_STR:

            data = asn_build_bitstring(data, listlength, var_val_type,

                    var_val, var_val_len);

            break;

        case SNMP_NOSUCHOBJECT:

        case SNMP_NOSUCHINSTANCE:

        case SNMP_ENDOFMIBVIEW:

            data = asn_build_null(data, listlength, var_val_type);

            break;

#ifdef OPAQUE_SPECIAL_TYPES

      case ASN_OPAQUE_FLOAT:

        data = asn_build_float(data, listlength, var_val_type,

                               (float *) var_val, var_val_len);

        break;

      case ASN_OPAQUE_DOUBLE:

        data = asn_build_double(data, listlength, var_val_type,

                               (double *) var_val, var_val_len);

        break;

      case ASN_OPAQUE_I64:

        data = asn_build_signed_int64(data, listlength, var_val_type,

                                      (struct counter64 *) var_val,

                                      var_val_len);

        break;

#endif /* OPAQUE_SPECIAL_TYPES */

        default:

            ERROR_MSG("wrong type");

            return NULL;

    }

    if (data == NULL){

        ERROR_MSG("Can't build value");

        return NULL;

    }

    dummyLen = (data - dataPtr) - headerLen;

    asn_build_sequence(dataPtr, &dummyLen,

                       (u_char)(ASN_SEQUENCE | ASN_CONSTRUCTOR), dummyLen);

    return data;

}