HP X.25/9000 Programmer's Guide

Chapter 2 19

X.25 Addressing

Using Wildcard Addressing

Wildcard addressing lets a single listen socket connect to incoming calls

using a variety of addresses and protocol IDs.

NOTE Wildcard addresses are used in bind() calls only. They cannot be used in

connect() calls.

When an incoming CALL REQUEST packet is received, the x25addrstr

structure ﬁelds are checked in the following order:

x25ifname

x25_host

, and then

x25pid

. Refer to the sections below for instructions

on using wildcards for each of these ﬁelds.

Wildcard Addresses in the x25ifname[] Field

The

x25ifname[]

ﬁeld has only one form of wildcard addressing. If you

specify the null string (“\0”), the speciﬁed address will match the X.121

address of any interface connected to your system. If you specify an

interface name, only calls from that one interface will match.

Wildcard Addresses in the x25_host[] Field

A wildcard address in the

x25_host[]

ﬁeld can be either the null string

or a string composed wholly or partly of wildcard characters. Note that

the null string matches only the X.121 address of the interface on the

receiving end, not the subaddress.

Valid wildcard characters are the question mark (“?”) and the asterisk

(“*”). These characters can be used in combination with the decimal

digits normally speciﬁed in this ﬁeld. When used in the

x25_host

ﬁeld

and matched with an incoming call’s called address ﬁeld, they have the

properties described in table below.

Table 2-1 Wildcard Characters

Character Meaning

36960-90061.bk Page 19 Friday, November 10, 2000 3:42 PM