sysortable.c

Snmp（简单网管协议）软件包。

/*
 *  Template MIB group implementation - sysORTable.c
 *
 */
#include <config.h>
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <sys/types.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_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif

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

#if HAVE_DMALLOC_H
#include <dmalloc.h>
#endif

#include "mibincl.h"
#include "system.h"
#include "../struct.h"
#include "../util_funcs.h"
#include "sysORTable.h"
#include "../../snmpd.h"
#include "default_store.h"
#include "ds_agent.h"
#include "callback.h"
#include "agent_callbacks.h"

#ifdef USING_AGENTX_SUBAGENT_MODULE
#include "agentx/subagent.h"
#include "agentx/client.h"
#endif


struct timeval sysOR_lastchange;
static struct sysORTable *table=NULL;
static int numEntries=0;

/* define the structure we're going to ask the agent to register our
   information at */
struct variable2 sysORTable_variables[] = {
    { SYSORTABLEID,      ASN_OBJECT_ID,     RONLY, var_sysORTable, 1, {2}},
    { SYSORTABLEDESCR,   ASN_OCTET_STR,     RONLY, var_sysORTable, 1, {3}},
    { SYSORTABLEUPTIME,  ASN_TIMETICKS,     RONLY, var_sysORTable, 1, {4}}
};

/* Define the OID pointer to the top of the mib tree that we're
   registering underneath */
oid sysORTable_variables_oid[] = { SNMP_OID_MIB2,1,9,1 };
#ifdef USING_MIBII_SYSTEM_MIB_MODULE
extern oid system_module_oid[];
extern int system_module_oid_len;
extern int system_module_count;
#endif

void
init_sysORTable(void) {
  /* register ourselves with the agent to handle our mib tree */

#ifdef USING_AGENTX_SUBAGENT_MODULE
  if ( ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_ROLE) == MASTER_AGENT )
	(void)register_mib_priority("mibII/sysORTable",
		(struct variable *) sysORTable_variables,
		sizeof(struct variable2),
		sizeof(sysORTable_variables)/sizeof(struct variable2),
		sysORTable_variables_oid,
		sizeof(sysORTable_variables_oid)/sizeof(oid), 1);
  else
#endif
    REGISTER_MIB("mibII/sysORTable", sysORTable_variables, variable2, sysORTable_variables_oid);

#ifdef USING_MIBII_SYSTEM_MIB_MODULE
  if ( ++system_module_count == 3 )
	REGISTER_SYSOR_TABLE( system_module_oid, system_module_oid_len,
		"The MIB module for SNMPv2 entities");
#endif

  gettimeofday(&sysOR_lastchange, NULL);
}

	/*********************
	 *
	 *  System specific implementation functions
	 *
	 *********************/

u_char *
var_sysORTable(struct variable *vp,
		oid *name,
		size_t *length,
		int exact,
		size_t *var_len,
		WriteMethod **write_method)
{
  int i;
  struct sysORTable *ptr;

  if (header_simple_table(vp, name, length, exact, var_len, write_method, numEntries))
    return NULL;

  DEBUGMSGTL(("mibII/sysORTable", "sysORTable -- "));
  for(i = 1, ptr=table; ptr != NULL && i < (int)name[*length-1];
      ptr = ptr->next, i++) {
    DEBUGMSGTL(("mibII/sysORTable", "sysORTable -- %d != %d\n",i,name[*length-1]));
  }
  if (ptr == NULL) {
    DEBUGMSGTL(("mibII/sysORTable", "sysORTable -- no match: %d\n",i));
    return NULL;
  }
  DEBUGMSGTL(("mibII/sysORTable", "sysORTable -- match: %d\n",i));
  
  switch (vp->magic){
    case SYSORTABLEID:
      *var_len = ptr->OR_oidlen*sizeof(ptr->OR_oid[0]);
      return (u_char *) ptr->OR_oid;

    case SYSORTABLEDESCR:
      *var_len = strlen(ptr->OR_descr);
      return (u_char *) ptr->OR_descr;

    case SYSORTABLEUPTIME:
      long_return = timeval_uptime( &ptr->OR_uptime );
      return ((u_char *) &long_return);

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


int register_sysORTable_sess(oid *oidin,
			 size_t oidlen,
			 const char *descr,
			 struct snmp_session *ss)
{
  struct sysORTable **ptr=&table;
  struct register_sysOR_parameters reg_sysOR_parms;

    DEBUGMSGTL(("mibII/sysORTable", "sysORTable registering: "));
    DEBUGMSGOID(("mibII/sysORTable", oidin, oidlen));
    DEBUGMSG(("mibII/sysORTable","\n"));

  while(*ptr != NULL)
    ptr = &((*ptr)->next);
  *ptr = (struct sysORTable *) malloc(sizeof(struct sysORTable));
  if ( *ptr == NULL ) {
	return SYS_ORTABLE_REGISTRATION_FAILED;
  }
  (*ptr)->OR_descr = (char *) malloc(strlen(descr)+1);
  if ( (*ptr)->OR_descr == NULL ) {
	free( *ptr );
	return SYS_ORTABLE_REGISTRATION_FAILED;
  }
  strcpy((*ptr)->OR_descr, descr);
  (*ptr)->OR_oidlen = oidlen;
  (*ptr)->OR_oid = (oid *) malloc(sizeof(oid)*oidlen);
  if ( (*ptr)->OR_oid == NULL ) {
	free( *ptr );
	free( (*ptr)->OR_descr );
	return SYS_ORTABLE_REGISTRATION_FAILED;
  }
  memcpy((*ptr)->OR_oid, oidin, sizeof(oid)*oidlen);
  gettimeofday(&((*ptr)->OR_uptime), NULL);
  gettimeofday(&(sysOR_lastchange), NULL);
  (*ptr)->OR_sess = ss;
  (*ptr)->next = NULL;
  numEntries++;

  reg_sysOR_parms.name    = oidin;
  reg_sysOR_parms.namelen = oidlen;
  reg_sysOR_parms.descr   = descr;
  snmp_call_callbacks(SNMP_CALLBACK_APPLICATION, SNMPD_CALLBACK_REG_SYSOR,
                                       &reg_sysOR_parms);

  return SYS_ORTABLE_REGISTERED_OK;
}

int register_sysORTable(oid *oidin,
			 size_t oidlen,
			 const char *descr)
{
    return register_sysORTable_sess( oidin, oidlen, descr, NULL );
}



int unregister_sysORTable_sess(oid *oidin,
			 size_t oidlen,
			 struct snmp_session *ss)
{
  struct sysORTable **ptr=&table, *prev=NULL;
  int found = SYS_ORTABLE_NO_SUCH_REGISTRATION;
  struct register_sysOR_parameters reg_sysOR_parms;

    DEBUGMSGTL(("mibII/sysORTable", "sysORTable unregistering: "));
    DEBUGMSGOID(("mibII/sysORTable", oidin, oidlen));
    DEBUGMSG(("mibII/sysORTable","\n"));

  while(*ptr != NULL) {
    if ( snmp_oid_compare( oidin, oidlen, (*ptr)->OR_oid, (*ptr)->OR_oidlen) == 0 ) {
      if ( (*ptr)->OR_sess != ss )
	continue;	/* different session */
      if ( prev == NULL )
        table      = (*ptr)->next;
      else 
        prev->next = (*ptr)->next;

      free( (*ptr)->OR_descr );
      free( (*ptr)->OR_oid );
      free( (*ptr) );
      numEntries--;
      gettimeofday(&(sysOR_lastchange), NULL);
      found = SYS_ORTABLE_UNREGISTERED_OK;
      break;
    }
    prev = *ptr;
    ptr = &((*ptr)->next);
  }

  reg_sysOR_parms.name    = oidin;
  reg_sysOR_parms.namelen = oidlen;
  snmp_call_callbacks(SNMP_CALLBACK_APPLICATION, SNMPD_CALLBACK_UNREG_SYSOR,
                                       &reg_sysOR_parms);

  return found;
}


int unregister_sysORTable(oid *oidin,
                       size_t oidlen)
{
    return unregister_sysORTable_sess( oidin, oidlen, NULL );
}

void unregister_sysORTable_by_session(struct snmp_session *ss)
{
  struct sysORTable *ptr=table, *prev=NULL, *next;

  while ( ptr != NULL  ) {
    next = ptr->next;
    if (( (ss->flags & SNMP_FLAGS_SUBSESSION) && ptr->OR_sess == ss ) ||
        (!(ss->flags & SNMP_FLAGS_SUBSESSION) && ptr->OR_sess &&
                              ptr->OR_sess->subsession == ss )) {
      if ( prev == NULL )
          table = next;
      else
          prev->next = next;
        free( ptr->OR_descr );
        free( ptr->OR_oid );
        free( ptr );
        numEntries--;
        gettimeofday(&(sysOR_lastchange), NULL);
    } 
    else
      prev = ptr;
    ptr = next;
  }
}