registry.c

ucd-snmp源代码

/*
 *  registry:  displays a list of all loaded mib modules.
 *
 */

#include <config.h>
#include <sys/types.h>
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_WINSOCK_H
#include <winsock.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#endif

#include "mibincl.h"
#include "registry.h"
#include "system.h"

	/*********************
	 *
	 *  Kernel & interface information,
	 *   and internal forward declarations
	 *
	 *********************/

extern int subtree_size;
extern struct subtree *subtrees;

void init_registry(void) 
{

  struct variable2 registry_variables[] = {
    { REGISTRYINDEX,  ASN_OBJECT_ID, RONLY, var_registry, 1, {1}},
    { REGISTRYNAME,   ASN_OCTET_STR, RONLY, var_registry, 1, {2}}
  };

  /* Define the OID pointer to the top of the mib tree that we're
   registering underneath */
  oid registry_variables_oid[] = { 1,3,6,1,4,1,2021,102,1 };

    /* register ourselves with the agent to handle our mib tree */
  REGISTER_MIB("ucd-snmp/registry", registry_variables, variable2,
               registry_variables_oid);

}

static struct subtree *
header_registry(struct variable *vp,
		oid *name,
		size_t *length,
		int exact,
		size_t *var_len,
		WriteMethod **write_method)
{
#define REGISTRY_NAME_LENGTH	10
    oid newname[MAX_OID_LEN];
    struct subtree *mine = NULL;
    
    DEBUGMSGTL(("ucd-snmp/registry", "var_registry: "));
    DEBUGMSGOID(("ucd-snmp/registry", name, *length));
    DEBUGMSG(("ucd-snmp/registry"," %d\n", exact));

    if (*length < REGISTRY_NAME_LENGTH ||
        snmp_oid_compare(name, *length, vp->name, vp->namelen) < 1)
      mine = subtrees;
    else
      mine = find_subtree_next(&(name[REGISTRY_NAME_LENGTH]),
                               *length-REGISTRY_NAME_LENGTH,
                               subtrees);

    if (mine != NULL) {
      memcpy( (char *)newname,(char *)vp->name, (int)vp->namelen * sizeof(oid));
      memcpy( (char *)name,(char *)newname,
              ((int)vp->namelen + 1) * sizeof(oid));
      memcpy((char *)(name+vp->namelen), (char *)mine->start,
            ((int)mine->start_len) * sizeof(oid));
      *length = vp->namelen + mine->start_len;
    }

    DEBUGMSGTL(("ucd-snmp/registry", "var_registry result: "));
    DEBUGMSGOID(("ucd-snmp/registry", name, *length));
    DEBUGMSG(("ucd-snmp/registry","\n"));

    return mine;
}


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

u_char *
var_registry(struct variable *vp,
	     oid *name,
	     size_t *length,
	     int exact,
	     size_t *var_len,
	     WriteMethod **write_method)
{
  struct subtree *tp;
    if ((tp =
         header_registry(vp, name, length, exact, var_len, write_method))
        == NULL )
      return NULL;

    switch (vp->magic){
	case REGISTRYINDEX:
            *var_len = sizeof(oid)*(tp->namelen);
            return (u_char *) tp->name;
        case REGISTRYNAME:
            *var_len = strlen(tp->label);
            return (u_char *) tp->label;
        default:
	    DEBUGMSGTL(("snmpd", "unknown sub-id %d in var_registry\n", vp->magic));
    }
    return NULL;
}