general.c

wm PNE 3.3 source code, running at more than vxworks6.x version.

/* $Header: /usr/cvsroot/target/src/wrn/wm/demo/unxagent/sun/general.c,v 1.2 2001/11/09 21:49:01 josh Exp $ */

/*
 * Copyright (C) 1999-2005 Wind River Systems, Inc.
 * All rights reserved.  Provided under license only.
 * Distribution or other use of this software is only
 * permitted pursuant to the terms of a license agreement
 * from Wind River Systems (and is otherwise prohibited).
 * Refer to that license agreement for terms of use.
 */


/****************************************************************************
 *  Copyright 1988-1997 Epilogue Technology Corporation.
 *  Copyright 1998 Integrated Systems, Inc.
 *  All rights reserved.
 ****************************************************************************/

/*
 * $Log: general.c,v $
 * Revision 1.2  2001/11/09 21:49:01  josh
 * unxagent demo path adjustment, first pass
 *
 * Revision 1.1.1.1  2001/11/05 17:49:16  tneale
 * Tornado shuffle
 *
 * Revision 7.6  2001/01/19 22:25:01  paul
 * Update copyright.
 *
 * Revision 7.5  2000/03/17 00:15:16  meister
 * Update copyright message
 *
 * Revision 7.4  1998/02/25 04:58:18  sra
 * Update copyrights.
 *
 * Revision 7.3  1997/03/20 06:54:07  sra
 * DFARS-safe copyright text.  Zap!
 *
 * Revision 7.2  1997/02/25 10:58:16  sra
 * Update copyright notice, dust under the bed.
 *
 * Revision 7.1  1997/01/08 23:01:49  sar
 * Updated copyright and modified include files to use envoy/h as
 * appropriate
 *
 * Revision 7.0  1996/03/15  22:07:57  sar
 * Updated revision to 7.0 and copyright to 96
 *
 * Revision 6.1  1995/11/01  01:03:00  sar
 * added pp style argument lists
 * repaginated
 *
 * Revision 6.0  1995/05/31  21:49:42  sra
 * Release 6.0.
 *
 * Revision 5.0  1994/05/16  16:20:43  sar
 * Updated revision to 5.0 and copyright to include 1994
 *
 * Revision 4.0  1993/06/24  17:34:02  sar
 * Updated rev to 4.0 copyright to 93
 *
 * Revision 3.2  1993/06/13  02:53:35  sar
 * Removed sysent.h and libc.h and moved them into envoy.h
 * for mach386.
 *
 * Revision 3.1  1993/05/13  22:20:00  sar
 * Added defines, includes (<sysent.h>, <errno.h>, <libc.h>) and casts
 * (struct sockaddr *) as well as changed memfoo to MEMFOO and objidcmp
 * to llist_cmp to get rid of warnings.
 *
 * Revision 3.0  1992/04/03  19:53:44  dab
 * Release 3.0
 *
 * Revision 2.101  92/02/04  10:46:43  dab
 * Updated for release 3.0 of SNMP.
 * 
 * Revision 2.100  92/02/03  16:46:07  dab
 * Generic unix SNMP agent.
 * 
 * 
 *    Rev 2.0   31 Mar 1990 15:34:20
 * Initial revision.
 * 
*/

/* [clearcase]
modification history
-------------------
01a,19apr05,job  update copyright notices
*/



#include <stdio.h>
#include <nlist.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <netinet/if_ether.h>
#include <errno.h>

#include <wrn/wm/snmp/engine/asn1.h>
#include <wrn/wm/snmp/engine/snmp.h>
#include <wrn/wm/snmp/engine/auxfuncs.h>

#include "../agent.h"
#include "snmpvars.h"
#include "general.h"

/* This routine needs to get into caching in a big way. */
off_t
  find_loc(struct kernel_symbol *sym)
{
    struct nlist syms[2];

    if (sym->flags & KO_FAILED)
      return 0;
    if (sym->flags & KO_VALID)
      return sym->offset;

    memset((char *)syms, 0, sizeof(syms));

    syms[0].n_name = sym->name;

    if (trace_level > 0) {
	printf("Looking up kernel variable `%s'\n", sym->name);
	fflush(stdout);
    }
    nlist(kernel_file, syms);
    if (syms[0].n_value == 0) {
	printf("  Couldn't find kernel variable `%s' in kernel file `%s'\n",
	       sym->name, kernel_file);
	fflush(stdout);
	sym->flags |= KO_FAILED;
	return 0;
    }
    else {
	sym->flags |= KO_VALID;
	if (trace_level > 2) {
	    printf("  Offset is %8.8X(hex)  %d(decimal)\n",
		   syms[0].n_value, syms[0].n_value);
	    fflush(stdout);
	}
	return sym->offset = syms[0].n_value;
    }
}


static int kmem = -2;
static char kmem_file[] = "/dev/kmem";
static char no_kmem[] = "Can not open kernel memory";

int
  read_int(off_t loc)
{
  int ret_value;

  if (kmem == -2) {
    kmem = open(kmem_file, O_RDWR, 777);
    if (kmem == -1) {
      perror(no_kmem);
      exit(1);
      }
    }

  if (kmem >= 0) {
    lseek(kmem, (long)loc, 0);
    read(kmem, &ret_value, sizeof(int));
    return ret_value;
    }
  else
    return 0;
}

int
  read_bytes(off_t loc,
	     char *buf,
	     int   len)
{
  if (kmem == -2)
    kmem = open(kmem_file, O_RDWR, 777);
  if (kmem == -1) {
    perror(no_kmem);
    exit(1);
    }

  if (kmem >= 0) {
    lseek(kmem, (long)loc, 0);
    len = read(kmem, buf, len);
    return len;
    }
  else
    return 0;
}

int
  write_bytes(off_t loc,
	      char *buf,
	      int   len)
{
  if (kmem == -2)
    kmem = open(kmem_file, O_RDWR, 777);
  if (kmem == -1) {
    perror(no_kmem);
    exit(1);
    }

  if (kmem >= 0) {
    lseek(kmem, (long)loc, 0);
    len = write(kmem, buf, len);
    return len;
    }
  else
    return 0;
}