snmpengine.c

Snmp（简单网管协议）软件包。

/* snmpEngine.c: implement's the SNMP-FRAMEWORK-MIB. */

#include <config.h>

#if HAVE_WINSOCK_H
#include <winsock.h>
#endif

#include "mibincl.h"
#include "snmpv3.h"
#include "util_funcs.h"
#include "lcd_time.h"
#include "../mibII/sysORTable.h"
#include "snmpEngine.h"

struct variable2 snmpEngine_variables[] = {
  { SNMPENGINEID        , ASN_OCTET_STR  , RONLY , var_snmpEngine, 1, { 1 } },
#ifdef SNMP_TESTING_CODE 
  { SNMPENGINEBOOTS     , ASN_INTEGER    , RWRITE, var_snmpEngine, 1, { 2 } },
  { SNMPENGINETIME      , ASN_INTEGER    , RWRITE, var_snmpEngine, 1, { 3 } },
#else /* !SNMP_TESTING_CODE */ 
  { SNMPENGINEBOOTS     , ASN_INTEGER    , RONLY , var_snmpEngine, 1, { 2 } },
  { SNMPENGINETIME      , ASN_INTEGER    , RONLY , var_snmpEngine, 1, { 3 } },
#endif /* SNMP_TESTING_CODE */
  { SNMPENGINEMAXMESSAGESIZE, ASN_INTEGER, RONLY , var_snmpEngine, 1, { 4 } },
};

/* now load this mib into the agents mib table */
oid snmpEngine_variables_oid[] = {1,3,6,1,6,3,10,2,1};

void init_snmpEngine (void) {
#ifdef USING_MIBII_SYSORTABLE_MODULE
  static oid reg[] = {1,3,6,1,6,3,10,3,1,1};
  register_sysORTable(reg,10,"The SNMP Management Architecture MIB.");
#endif

  REGISTER_MIB("snmpv3/snmpEngine", snmpEngine_variables, variable2,
		 snmpEngine_variables_oid);

/* place any initialization routines needed here */
}

extern struct timeval starttime;

#ifdef SNMP_TESTING_CODE
int write_engineBoots(int, u_char *,u_char, size_t, u_char *,oid*, size_t);
int write_engineTime(int, u_char *,u_char, size_t, u_char *,oid*, size_t);
#endif /* SNMP_TESTING_CODE */

u_char *
var_snmpEngine(
    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 unsigned char engineID[SNMP_MAXBUF];

  *write_method = 0;           /* assume it isnt writable for the time being */
  *var_len = sizeof(long_ret); /* assume an integer and change later if not */

  if (header_generic(vp,name,length,exact,var_len,write_method))
      return 0;

  /* this is where we do the value assignments for the mib results. */
  switch(vp->magic) {

    case SNMPENGINEID:
      *var_len = snmpv3_get_engineID(engineID, SNMP_MAXBUF);
      /* XXX  Set ERROR_MSG() upon error? */
      return (unsigned char *) engineID;

    case SNMPENGINEBOOTS:
#ifdef SNMP_TESTING_CODE
      *write_method = write_engineBoots;
#endif /* SNMP_TESTING_CODE */
      long_ret = snmpv3_local_snmpEngineBoots();
      return (unsigned char *) &long_ret;

    case SNMPENGINETIME:
#ifdef SNMP_TESTING_CODE
      *write_method = write_engineTime;
#endif /* SNMP_TESTING_CODE */
      long_ret = snmpv3_local_snmpEngineTime();
      return (unsigned char *) &long_ret;

    case SNMPENGINEMAXMESSAGESIZE:
      long_ret = 1500;
      return (unsigned char *) &long_ret;

    default:
      DEBUGMSGTL(("snmpd", "unknown sub-id %d in var_snmpEngine\n", vp->magic));
  }
  return 0;
}

#ifdef SNMP_TESTING_CODE
/* write_engineBoots():

   This is technically not writable a writable mib object, but we
   allow it so we can run some time synchronization tests.
*/
int
write_engineBoots(
   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)
{
  /* variables we may use later */
  static long long_ret;
  size_t size;
  int bigsize=SNMP_MAXBUF_MEDIUM;
  u_char engineIDBuf[SNMP_MAXBUF_MEDIUM];
  int engineIDBufLen = 0;

  if (var_val_type != ASN_INTEGER){
      DEBUGMSGTL(("snmpEngine","write to engineBoots not ASN_INTEGER\n"));
      return SNMP_ERR_WRONGTYPE;
  }
  if (var_val_len > sizeof(long_ret)){
      DEBUGMSGTL(("snmpEngine","write to engineBoots: bad length\n"));
      return SNMP_ERR_WRONGLENGTH;
  }
  long_ret = *((long *) var_val);
  if (action == COMMIT) {
    engineIDBufLen = snmpv3_get_engineID(engineIDBuf, SNMP_MAXBUF_MEDIUM);
    /* set our local engineTime in the LCD timing cache */
    snmpv3_set_engineBootsAndTime(long_ret, snmpv3_local_snmpEngineTime());
    set_enginetime(engineIDBuf, engineIDBufLen, 
                   snmpv3_local_snmpEngineBoots(), 
                   snmpv3_local_snmpEngineTime(),
                   TRUE);
  }
  return SNMP_ERR_NOERROR;
}

/* write_engineTime():

   This is technically not writable a writable mib object, but we
   allow it so we can run some time synchronization tests.
*/
int
write_engineTime(
   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)
{
  /* variables we may use later */
  static long long_ret;
  size_t size;
  int bigsize=SNMP_MAXBUF_MEDIUM;
  u_char engineIDBuf[SNMP_MAXBUF_MEDIUM];
  int engineIDBufLen = 0;

  if (var_val_type != ASN_INTEGER){
      DEBUGMSGTL(("snmpEngine","write to engineTime not ASN_INTEGER\n"));
      return SNMP_ERR_WRONGTYPE;
  }
  if (var_val_len > sizeof(long_ret)){
      DEBUGMSGTL(("snmpEngine","write to engineTime: bad length\n"));
      return SNMP_ERR_WRONGLENGTH;
  }
  long_ret = *((long *) var_val);
  if (action == COMMIT) {
    engineIDBufLen = snmpv3_get_engineID(engineIDBuf, SNMP_MAXBUF_MEDIUM);
    /* set our local engineTime in the LCD timing cache */
    snmpv3_set_engineBootsAndTime(snmpv3_local_snmpEngineBoots(), long_ret);
    set_enginetime(engineIDBuf, engineIDBufLen, 
                   snmpv3_local_snmpEngineBoots(), 
                   snmpv3_local_snmpEngineTime(),
                   TRUE);
  }
  return SNMP_ERR_NOERROR;
}

#endif /* SNMP_TESTING_CODE */