254 UTL_INADDR

The UTL_INADDR package provides a PL/SQL procedures to support internet addressing. It provides an API to retrieve host names and IP addresses of local and remote hosts.

This chapter contains the following topics:

Using UTL_INADDR
- Security Model
- Exceptions
- Examples
Summary of UTL_INADDR Subprograms

Security Model

This package is an invoker's rights package, which means that the invoking user must be granted the connect privilege in the access control list assigned to the remote network host to which he or she wishes to connect.

Note:

For more information about managing fine-grained access, see Oracle Database Security Guide.

Exceptions

Table 254-1 Exception - Internet Address Package

Number	Exception	Description
`ORA-24247`	`NETWORK_ACCESS_DENIED`	Access to network is denied.
`ORA-29257`	`UNKNOWN_HOST`	The host is unknown.

Examples

Retrieve the local host name and IP address.

SET serveroutput on
BEGIN
  DBMS_OUTPUT.PUT_LINE(UTL_INADDR.GET_HOST_NAME);  -- get local host name
  DBMS_OUTPUT.PUT_LINE(UTL_INADDR.GET_HOST_ADDRESS);  -- get local IP addr
END;
/

Summary of UTL_INADDR Subprograms

Table 254-2 UTL_INADDR Package Subprograms

Subprogram	Description
GET_HOST_ADDRESS Function	Retrieves the IP address of the local or remote host given its name
GET_HOST_NAME Function	Retrieves the name of the local or remote host given its IP address

GET_HOST_ADDRESS Function

This function retrieves the IP address of the specified host.

Syntax

UTL_INADDR.GET_HOST_ADDRESS (
   host  IN VARCHAR2 DEFAULT NULL) 
RETURN host_address VARCHAR2;

Parameters

Table 254-3 GET_HOST_ADDRESS Function Parameters

Parameter	Description
`host`	The name of the host to retrieve the IP address.

Return Values

Table 254-4 GET_HOST_ADDRESS Function Return Values

Parameter	Description
`host_address`	The IP address of the specified host, or that of the local host if host is `NULL`.

Exceptions

UNKNOWN_HOST: The specified IP address is unknown

Usage Notes

The permission to obtain the host name or IP address of the current host is controlled by the resolve privilege on LOCALHOST.

GET_HOST_NAME Function

This function retrieves the name of the local or remote host given its IP address.

Syntax

UTL_INADDR.GET_HOST_NAME (
   ip  IN VARCHAR2 DEFAULT NULL)
RETURN host_name VARCHAR2;

Parameters

Table 254-5 GET_HOST_NAME Function Parameters

Parameter	Description
`ip`	The IP address of the host used to determine its host name. If ip is not `NULL,` the official name of the host with its domain name is returned. If this is `NULL,` the name of the local host is returned and the name does not contain the domain to which the local host belongs.

Return Values

Table 254-6 GET_HOST_NAME Function Return Values

Parameter	Description
`host_name`	The name of the local or remote host of the specified IP address.

Exceptions

UNKNOWN_HOST: The specified IP address is unknown

Usage Notes

The permission to obtain the host name or IP address of the current host is controlled by the resolve privilege granted through DBMS_NETWORK_ACL_ADMIN on LOCALHOST.