Re:Re:Re:Re: why ucd-snmp agent can only be get, can't be set always

Oh! I forgot the attached compressed file for my MIB module's figure   
在2007-08-23，ye_cl <[email protected]> 写道：
hi, Using the command of "./snmpd -c /usr/local/share/snmp/snmpd.conf -f &" to run the agent in target board's uClinux, Now I can set the agent from the client. I think the reason is that the snmpd.conf under /usr/local/share/snmp/ dir can't be read by the agent in uClinux by default,we must manually tell the agent where snmpd.conf is. Now I have another question. 
I built my MIB module by tool of MG-SOFT MIB Builder.The MIB module is SMIv2, the attached file is my MIB module's figure in MG-SOFT MIB Builder. I use "env MIBS=”+SCOM-SV260A-MIB” mib2c scomcenter" to produce my module's skeleton source files for node "scomcenter".Now the agent will receive a get request for oid "1.3.6.1.4.1" which is type of OBJECT IDENTIFIER, and then send the value of oid"1.3.6.1.4.1.19176.1.1.20.1.0" to client for response. In my scomcenter.c, I don't know how to implement it, the get request oid and the response oid are not the same, and not the same level in MIB tree. In the mib2c-produced skeleton source files, I can only respond the oid that is from the client's request,and oid's node type must be OBJECT-TYPE.Would you please give me some help? regards,
yecl
   
在2007-08-23，ye_cl <[email protected]> 写道：
 Hi,Dave, I use ./snmpd& to run the agent in mine target board, use "snmpget -v2c -c public 200.162.162.190 .1.3.6.1.4.1.19176.1.1.20.3.0.0" to get,and use "snmpset -v2c -c private 200.162.162.190 .1.3.6.1.4.1.19176.1.1.20.3.0.0 i 333" to set. I find there is always no response UDP packet sent from the agent,and the uClinux on target board will lose some memory every time I do set operation.
my 'my_mib.c' looks like, I only set DESTPORT: #include <config.h>#if TIME_WITH_SYS_TIME
# ifdef WIN32
#  include <sys/timeb.h>
# else
#  include <sys/time.h>
# endif
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif#if HAVE_WINSOCK_H
#include <winsock.h>
#endif#include "mibincl.h"
#include "snmpv3.h"
#include "snmpusm.h"
#include "agent_read_config.h"
#include "util_funcs.h"
#include "my_mib.h"static unsigned long dest_port = 3020;struct variable7 my_mib_variables[] = {
/*  magic number        , variable type , ro/rw , callback fn  , L, oidsuffix */
#define   TSOVERIPSTATUS        1
  { TSOVERIPSTATUS      , ASN_INTEGER   , RWRITE, var_my_mib, 5, { 1,1,20,1,0 } },
#define   DESTIPADDR            2
  { DESTIPADDR          , ASN_OCTET_STR , RWRITE, var_my_mib, 5, { 1,1,20,2,0 } },
#define   DESTPORT              3
  { DESTPORT            , ASN_INTEGER   , RWRITE, var_my_mib, 5, { 1,1,20,3,0 } },
#define   RESET                 4
  { RESET               , ASN_INTEGER   , RWRITE, var_my_mib, 5, { 1,1,20,4,0 } },
#define   DEVICESTATUS          5
  { DEVICESTATUS        , ASN_INTEGER   , RWRITE, var_my_mib, 5, { 1,1,20,5,0 } },
#define   SYSTEMBITRATE         6
  { SYSTEMBITRATE       , ASN_INTEGER   , RWRITE, var_my_mib, 5, { 1,1,20,6,0 } },
#define   EFFECTIVEBITRATE      7
  { EFFECTIVEBITRATE    , ASN_INTEGER   , RWRITE, var_my_mib, 5, { 1,1,20,7,0 } },
#define   UDPUARTPORT           8
  { UDPUARTPORT         , ASN_INTEGER   , RWRITE, var_my_mib, 5, { 1,1,20,8,0 } },
#define   DESCRIPTION           9
  { DESCRIPTION         , ASN_OCTET_STR , RONLY , var_my_mib, 2, { 2,1 } },
#define   LOCATED               10
  { LOCATED             , ASN_OCTET_STR , RONLY , var_my_mib, 2, { 2,2 } },};/* Define the OID pointer to the top of the mib tree that we're
   registering underneath */
oid my_mib_variables_oid[] = { 1,3,6,1,4,1,19176 };//void init_ucdDemoPublic(void) {
void init_my_mib(void) {
  REGISTER_MIB("my_mib", my_mib_variables, variable7,
               my_mib_variables_oid);
}unsigned char *
var_my_mib(struct variable *vp,
                oid     *name,
                size_t  *length,
                int     exact,
                size_t  *var_len,
                WriteMethod **write_method)
{
  /* variables we may use later */
  static long long_ret;
  static u_long ulong_ret;
  static unsigned char string[SPRINT_MAX_LEN];
  static oid objid[MAX_OID_LEN];
  static struct counter64 c64;
  if (header_generic(vp,name,length,exact,var_len,write_method)
                                  == MATCH_FAILED )
    return NULL;
  /*
   * this is where we do the value assignments for the mib results.
   */
  switch(vp->magic) {
    case TSOVERIPSTATUS:
        *write_method = write_tsoveripstatus;
        long_ret = 0;
        return (unsigned char *) &long_ret;    case DESTIPADDR:
        *write_method = write_destipaddr;
        *string = 0;
        *var_len = strlen(string);
        return (unsigned char *) string;    case DESTPORT:
        *write_method = write_destport;
        return (u_char *) & dest_port;    case RESET:
        *write_method = write_reset;
        long_ret = 0;
        return (unsigned char *) &long_ret;    case DEVICESTATUS:
        *write_method = write_devicestatus;
        long_ret = 0;
        return (unsigned char *) &long_ret;    case SYSTEMBITRATE:
        *write_method = write_systembitrate;
        long_ret = 0;
        return (unsigned char *) &long_ret;    case EFFECTIVEBITRATE:
        *write_method = write_effectivebitrate;
        long_ret = 0;
        return (unsigned char *) &long_ret;    case UDPUARTPORT:
        *write_method = write_udpuartport;
        long_ret = 0;
        return (unsigned char *) &long_ret;    case DESCRIPTION:
       
        *string = 0;
        *var_len = strlen(string);
        return (unsigned char *) string;    case LOCATED:
       
        *string = 0;
        *var_len = strlen(string);
        return (unsigned char *) string;
    default:
      ERROR_MSG("");
  }
  return NULL;
}
int
write_destport(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 destport not ASN_INTEGER\n");
              return SNMP_ERR_WRONGTYPE;
          }
          if (var_val_len > sizeof(long_ret)){
              fprintf(stderr,"write to destport: bad length\n");
              return SNMP_ERR_WRONGLENGTH;
          }
        if (var_val < 0) {
            fprintf(stderr, "write to destport: bad value\n");
            return SNMP_ERR_WRONGVALUE;
        }
          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!
          dest_port = (unsigned long)*long_ret;
          break;
  }
  return SNMP_ERR_NOERROR;
}....../*..And other write functions......*/
......
在2007-08-22，"Dave Shield" <[email protected]> 写道：
On 22/08/07, ye_cl <[email protected]> wrote: > I have a question about using ucd-snmp-4.1.2 on uClinux. That's a *VERY* old version of the code, and is no longer being maintained. That shouldn't affect your particular problem, but you should strongly consider upgrading to a more recent version. > When my snmpd is running on uClinux, I can only do get operation, > there is always the response of "request timed out" for set. What is the command that you are running? What does your file 'my_mib.c' look like? Dave ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Net-snmp-users mailing [email protected] Please see the following page to unsubscribe or change other options: https://lists.sourceforge.net/lists/listinfo/net-snmp-users
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