All addressing information for both the client and server
is contained in the x25addrstr
structure. This structure is defined in the include file x25/ x25addrstr.h.
It is used by the client in the connect()
system call and by the server in the bind()
system call. How the client and server use these calls is described
in Chapter 3 “ Establishing and
Terminating a Socket Connection”
The x25addrstr structure
consists of the following declarations:
struct x25addrstr {
unsigned short x25_family;
unsigned char x25hostlen;
unsigned char x25pidlen;
unsigned char x25pid[8];
unsigned char x25_host[16];
char x25ifname[13];
} /* x25addrstr */ |
x25_family
Specifies the address family and must be set to AF_CCITT,
which is defined in the sys/socket.h
include file.
x25hostlen
Specifies the offset for the end of the numeric string in
the X.121 address specified in the x25_host
field described below. Range: 0 to 15 (including subaddress digits).
x25pidlen
Specifies the offset for the end of the character string that
describes the protocol ID data. This field is not used in connect()
system calls; the protocol ID must be explicitly set in the user
data field by the application. Range: 0 to 8. Set this field to
0 in a connect() system call
or (if protocol IDs are not used) in your application.
x25pid[8]
Specifies the protocol ID data in a bind()
system call. The protocol ID data is located in the call-user data
field of the CALL INDICATION packet. See "Addressing Options
for Servers" below.
x25_host[16]
Specifies a destination X.121 address in a connect()
system call with a decimal string (digits 0-9). In a bind()
system call, this field specifies the range of X.121 addresses that
it will receive with a decimal string and (optionally) with wildcard
characters ("?" and "*"). See
"Addressing Options for Servers" below. This field
may also include a subaddress.
x25ifname[13]
Specifies the name of the X.25 interface set during X.25 configuration.
The null string ("\0") specifies the
default interface in connect()
and all interfaces in bind().
Range: 1 to 12 alphanumeric characters terminated by the null character
("\0").
Refer to the AF_CCITT(7F)
entry in your man pages for more information on the x25addrstr
structure.
