209 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
- Exceptions
- Examples
Summary of UTL_INADDR Subprograms

Exceptions

Table 209-1 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 209-2 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 209-3 GET_HOST_ADDRESS Function Parameters

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

Return Values

Table 209-4 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.

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 209-5 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 209-6 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