/* *  Embedded SNMP user table and dynamic functions * *  ./software/ch8/emsnmp/user.c * *  mtj@cogitollc.com * */#include <stdio.h>#include <string.h>#include <time.h>#include "emsnmp.h"#include "snmpdata.h"#include "user.h"time_t startTime;static void currentUptime(void *, unsigned char *);static void syncStatus(void *, unsigned char *);static void signalStrength(void *, unsigned char *);dataEntryType snmpData[]={  /* System MIB */    /* SysDescr Entry */    {8, {0x2b, 6, 1, 2, 1, 1, 1, 0},        OCTET_STRING, 17, {"Embedded Computer"},        NULL},      /* SysObjectID Entry */    {8, {0x2b, 6, 1, 2, 1, 1, 2, 0},        OBJECT_IDENTIFIER, 8, {"\x2b\x06\x01\x02\x01\x01\x02\x00"},       NULL},    /* SysUptime Entry */    {8, {0x2b, 6, 1, 2, 1, 1, 3, 0},        TIME_TICKS, 0, {""},       currentUptime},    /* sysContact Entry */    {8, {0x2b, 6, 1, 2, 1, 1, 4, 0},        OCTET_STRING, 15, {"mtj@mtjones.com"},        NULL},    /* sysName Entry */    {8, {0x2b, 6, 1, 2, 1, 1, 5, 0},        OCTET_STRING, 14, {"ec.mtjones.com"},        NULL},    /* Location Entry */    {8, {0x2b, 6, 1, 2, 1, 1, 6, 0},        OCTET_STRING, 5, {"B3B44"},       NULL},    /* SysServices */    {8, {0x2b, 6, 1, 2, 1, 1, 7, 0},        INTEGER, 4, {""},        NULL},  /* Experimental MIB for the Antenna manager */    /* Antenna Azimuth Commanded Position */    {6, {0x2b, 6, 1, 3, 1, 0},      INTEGER, 4, {""},      NULL},    /* Antenna Elevation Commanded Position */    {6, {0x2b, 6, 1, 3, 2, 0},      INTEGER, 4, {""},      NULL},    /* Antenna Receiver Sync Status */    {6, {0x2b, 6, 1, 3, 3, 0},      OCTET_STRING, 0, {""},      syncStatus},    /* Antenna Receiver Signal Strength Status */    {6, {0x2b, 6, 1, 3, 4, 0},      INTEGER, 4, {""},      signalStrength}};const int maxData = (sizeof(snmpData) / sizeof(dataEntryType));/* MIB Initialization */void initTable( void ){  /* Items must be in OID order */  startTime = time(NULL);  /* Note:  The C spec permits the auto-initialization of the first member   * of a union.  Therefore, since the first member of the union is a string,   * we initialize the 'u.intval' elements here.   */  snmpData[6].u.intval = 5; /* System.Services */  snmpData[7].u.intval = 0; /* Azimuth   */  snmpData[8].u.intval = 0; /* Elevation */}/* Dynamic Data Functions */static void currentUptime(void *ptr, unsigned char *len){  time_t curTime = time(NULL);  *(unsigned int *)ptr = (unsigned int)(curTime - startTime) * 100;  *len = 4;}static int sigStr = 0;static void syncStatus(void *ptr, unsigned char *len){  if (snmpData[8].u.intval > 90) {    *len = sprintf((char *)ptr, "detected");    sigStr = 99;  } else {    *len = sprintf((char *)ptr, "no signal");    sigStr = 0;  }}static void signalStrength(void *ptr, unsigned char *len){  *(unsigned int *)ptr = sigStr;  *len = 4;}/* *  Copyright (c) 2002 Charles River Media.  All rights reserved. *  *  Redistribution and use in source and binary forms, with or  *  without modification, is hereby granted without fee provided  *  that the following conditions are met: *  *    1.  Redistributions of source code must retain the above  *        copyright notice, this list of conditions and the  *        following disclaimer. *    2.  Redistributions in binary form must reproduce the above *        copyright notice, this list of conditions and the  *        following disclaimer in the documentation and/or other  *        materials provided with the distribution. *    3.  Neither the name of Charles River Media nor the names of  *        its contributors may be used to endorse or promote products  *        derived from this software without specific prior  *        written permission. *  * THIS SOFTWARE IS PROVIDED BY CHARLES RIVER MEDIA AND CONTRIBUTERS  * 'AS IS' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL CHARLES * RIVER MEDIA OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,  * INCIDENTAL, SPECIAL, EXEMPLARAY, OR CONSEQUENTIAL DAMAGES (INCLUDING,  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE  * POSSIBILITY OF SUCH DAMAGE. */