protocol://V.v@addr1,...,W.w@addrN
where V.v
and W.w
are optional protocol
versions for each address. An example of an IIOP endpoint is:
iiop://hostname:port
Sets of endpoints may be specified using multiple
-ORBListenEndpoints
options or by delimiting endpoints with
a semi-colon (;). For example:
-ORBListenEndpoints iiop://localhost:9999 -ORBListenEndpoints uiop:///tmp/mylocalsock -ORBListenEndpoints shmiop://10002
is equivalent to:
-ORBListenEndpoints 'iiop://localhost:9999;uiop:///tmp/mylocalsock;shmiop://10002'
Notice the single quotes (') in the latter option specification.
Single quotes are needed to prevent the shell from interpreting
text after the semi-colon as another command to run.
If an endpoint is specified without an addr
such as
the following:
-ORBListenEndpoints uiop:// -ORBListenEndpoints shmiop://
then a default endpoint will be created for the specified protocol.
This is a server side option.
The -ORBListenEndpoints
options can accept
endpoint-specific options. Specifically, such options will only
apply to the endpoint for which they were specified.
An endpoint-specific option is used as follows:
-ORBListenEndpoints iiop://foo:1234/option=value
Additional options can be specified by separating each option
with an ampersand '&
' as follows:
-ORBListenEndpoints 'iiop://foo:1234/option1=value1&option2=value2'
Notice that the address and the endpoint-specific options are
separated by a forward slash '/
' in this case,
i.e. for IIOP endpoints. This character may differ for other
types of pluggable protocol endpoints. For example, UIOP
endpoint-specific options are separated from the address by a
vertical bar '|
'. Also note that when using more
than option, quotes should be used to prevent the shell from
interpreting the ampersand '&
' as a command to
tell the shell to backgroup a job.
IIOP endpoints in TAO have the form:
-ORBListenEndpoints iiop://V.v@hostname1:port1,...,W.w@hostname2:port2
Where "V.v
" and "W.w
" are the IIOP
protocol versions associated with the given address
(hostname:port pair). Currently supported versions are
1.0
, 1.1
, and 1.2
.
Options are separated from the addresses by a forward slash
'/
'. For instance, if an IIOP endpoint should have
a property foobar of 50 associated with it, then the following
endpoint specification could be used
-ORBListenEndpoints iiop://hostname:port/foobar=50
IIOP addresses are comprised of a hostname (or an IP address) and a TCP port the server should listen on. The hostname is used to select which network interface to set up the endpoint on. It is not used to set the hostname that goes into the generated IOR. This is especially useful if the endpoint should be setup on a specific network interface other than the default network interface.
Suppose a host has the following network interfaces:
To set up an endpoint on the second network interface "eth1," the following endpoint specification could be used:
or:
-ORBListenEndpoints iiop://foo2
-ORBListenEndpoints iiop://foo2.bar.baz
TAO will attempt to ensure that the fully qualified domain name is embedded in the IOR.
In the above example, an available port will be chosen by TAO (actually the operating system kernel), which will then be placed into the IOR.
To set up an endpoint on a specific port, simply use an endpoint of the form:
-ORBListenEndpoints iiop://foo2:1234
where 1234
is the TCP port the endpoint will be
opened on. In this case, an endpoint will be opened on the
network interface associated with the hostname foo2
on port 1234
.
Port names are also accepted. For example, suppose a
UNIX installation has a service called "my_protocol" associated
with port 1234 in the service database in
/etc/services
, then the following would cause an
endpoint to be opened on the port associated with that service:
-ORBListenEndpoints iiop://foo2:my_protocol
Port numbers range from 0
(causes port to be chosen
by operating system) to 65355
. Port numbers less
than 1024
on UNIX systems are considered
privileged, and require super-user privileges to access them.
Also be aware that some ports may already be in use by other
applications.
Suppose an endpoint should be created on each network interface. To do so, simply omit the address from the endpoint specification as follows:
-ORBListenEndpoints iiop://
In this case, an endpoint will be set up on each network interface detected by TAO. The port for each opened endpoint will be chosen automatically. The chosen port will be the same for all endpoints. Each endpoint will be represented in generated IOR as a separate profile.
Note that network interface detection only work on platforms that support this feature. If network interface detection isn't supported, then the default network interface will be chosen.
Now suppose that an endpoint should be created on each detected network interface, but with a specific port. This can be achieved by using an endpoint specification of the form:
-ORBListenEndpoints iiop://:1234
This will create endpoints on each detected network interface,
each with the TCP port 1234
. Notice that there is
a colon ':
' preceeding the port number
1234
. That colon is necessary to make TAO
interpret 1234
as a port. Without the colon, TAO
would interpret 1234
as a hostname associated with
a given network interface.
The hostname part of an endpoint can also be specified as a literal IP address in 'dotted decimal address' form for IPv4 addresses:
For IPv6 addresses a special form is required to specify decimal IP addresses since the decimal separator for IPv6 addresses is identical to the separator used for port numbers; i.e. a colon (':'). To be able to distinguish an endpoint specification for host 01ef::1 and port 123 and one for host 01ef::1:123 and no port number IPv6 decimal addresses need to enclosed by square brackets ('[' and ']'):
-ORBListenEndpoints iiop://192.168.10.24:1234
NOTE: Since IPv6 endpoint are supported only for GIOP/IIOP versions >= 1.2 it is illegal to combine version numbers < 1.2 and IPv6 decimal addresses:
-ORBListenEndpoints iiop://[01ef::1]:123 -ORBListenEndpoints iiop://[01ef::1:123]
-ORBListenEndpoints iiop://1.1@[01ef::1]:123 --> ILLEGAL
TAO supports the following endpoint-specific options that apply only to IIOP endpoints:
Option | Availability | Description |
---|---|---|
portspan
|
TAO 1.1.15
|
The portspan option specifies that an IIOP endpoint
should be opened on the first available port within a
specified span of port numbers, beginning with a specified
initial port. This option is useful when one or more servers
may be restricted to using ports within a given range. The
intention is that the behavior should be similar to using
ephemeral ports except within a restricted user-defined
range.
The format for where initialPort is the initial port number in the range of allowable ports, and span is an integer value indicating the size of the span of allowable ports. Valid values for initialPort include any valid port number. Valid values for span are in the range 1 to 65535 . The
hostname (in [ ] )is optional.
The server's ORB will attempt to create a listening endpoint
beginning with the initial port. If that fails, it will try
the next port in the range. It will continue to try each
port in the range until it
is able to successfully open one for listening or until it has exhausted the range
|
hostname_in_ior
|
TAO 1.2.4
|
The hostname_in_ior option allows one to
specify the hostname that is inserted into the generated
IOR. This option overrides the default (local) hostnames
that TAO normally inserts. This can be useful in
environments where the hostname in use is one whose IP
address changes dynamically.
The format for where local_hostname and port are specified as normal, and overridden_hostname is the hostname that should be put into generated IORs. |
reuse_addr
|
TAO 1.4.8
|
Available in IIOP & SSLIOP the reuse_addr option allows one to
set the SO_REUSEADDR socket option on an endpoint. Doing so bypasses
the TCP TIME_WAIT and can be used to open an endpoint
on a port still in TIME_WAIT state. Use caution using this option. Its not
recommended for the general use-case. Setting
SO_REUSEADDR has been observed to cause unexpected side-effects on some
platforms (e.g. Solaris 5.7 x86 allows programs run as same or different
users to bind to the same port when SO_REUSEADDR is set by all users).
The format for
|
Here are some additional examples of IIOP endoints:
-ORBListenEndpoints iiop://1.0@foo1:0
-ORBListenEndpoints iiop://1.0@foo:0,1.1@bar,baz:3456
-ORBListenEndpoints iiop://1.0@foo:0,1.1@bar,baz:3456/foobar=300
-ORBListenEndpoints iiop:///foobar=2
(notice three slashes "///
")
-ORBListenEndpoints iiop://:2020/foobar=12345
-ORBListenEndpoints iiop://1.1@
-ORBListenEndpoints iiop://1.1@:1234
-ORBListenEndpoints iiop://1.1@,1.0@:1234,1.1@
-ORBListenEndpoints iiop://1.1@foo:2020/portspan=30
-ORBListenEndpoints iiop://foo:2020 -ORBListenEndpoints iiop://foo:10020
SHMIOP endpoints in TAO have the similar form to IIOP endpoints:
-ORBListenEndpoints shmiop://V.v@port1,...,W.w@port2
Where "V.v
" and "W.w
" are the SHMIOP
protocol versions associated with the given address
(port). Currently supported versions are 1.0
,
1.1
, and 1.2
.
SHMIOP addresses are comprised of a port number that the server should listen on.
Port numbers range from 0
(causes port to be chosen
by operating system) to 65335
. Port numbers less
than 1024
on UNIX systems are considered
privileged, and require super-user privileges to access them.
Also be aware that some ports may already be in use by other
applications.
To have TAO automatically choose an address for a given SHMIOP endpoint, simply omit the address from the endpoint specification as follows:
-ORBListenEndpoints shmiop://
In this case, an SHMIOP endpoint will be set up on a port chosen by TAO.
Here are some additional examples of SHMIOP endoints:
-ORBListenEndpoints shmiop://1.0@0
-ORBListenEndpoints shmiop://1.0@0,3456
-ORBListenEndpoints shmiop://1.0@0,3456/foobar=300
-ORBListenEndpoints shmiop:///foobar=2
(notice three slashes "///
")
-ORBListenEndpoints shmiop://2020/foobar=12345
-ORBListenEndpoints shmiop://1.1@
-ORBListenEndpoints shmiop://1.1@1234
-ORBListenEndpoints shmiop://1.1@,1.0@1234,1.1@
You must specify the hostname, however, when using SHMIOP with Interoperable Naming Service as you would with IIOP. This is because SHMIOP uses the hostname to determine the validity of an endpoint. That is, it will not try to connect to a remote SHMIOP endpoint locally. For examples:
-ORBInitRef MyService=corbaloc:shmiop:1.1@hostname:port/service_name
UIOP endpoints in TAO have the form:
-ORBListenEndpoints uiop://V.v@rendezvous_point1,...,W.w@rendezvous_point2
Where "V.v
" and "W.w
" are the UIOP
protocol versions associated with the given rendezvous point.
Currently supported versions are 1.0
and
1.1
.
Options are separated from the addresses by a vertical bar
'|
'. For instance, if an UIOP endpoint should have
a property foobar of 50 associated with it, then the following
endpoint specification could be used
-ORBListenEndpoints 'uiop://1.0@/tmp/my_rendezvous_point|foobar=50'
Notice that the endpoint is quoted to prevent the shell from
interpreting the vertical bar '|
' as the shell
"pipe" character.
UIOP addresses are comprised of a rendezvous point the server should listen on. The rendezvous point is generally the full path to the desired UNIX domain socket filename. Relative paths can be used, their use is discourages. The maximum length of the rendezvous point is 108 characters, as dictated by the POSIX.1g specification for local IPC rendezvous points. TAO will truncate any rendezvous point name longer than 108 characters.
An UIOP endpoint with a rendezvous point with an absolute path could be:
In this example, the optional protocol version and endpoint-specific options have been omitted. The rendezvous point
-ORBListenEndpoints uiop:///tmp/foobar
/tmp/foobar
will be created, in this case.
An UIOP endpoint with a rendezvous point with a relative path could be:
-ORBListenEndpoints uiop://foobar
(DISCOURAGED)
Again, rendezvous points with relative paths are discouraged since it is possible that other rendezvous points with the same basename exist on a given system, giving rise to potential ambiguities.
To make TAO choose a rendezvous point automatically, simply omit the rendezvous point from the endpoint specification as follows:
-ORBListenEndpoints uiop://
This will cause an endpoint to be setup in system temporary
directory. Rendezvous points chosen by TAO are prepended with
"TAO
." TAO will always choose rendezvous points
with absolute paths.
Here are some additional examples of UIOP endoints:
-ORBListenEndpoints uiop://1.0@/tmp/foo1
-ORBListenEndpoints uiop://1.0@/tmp/foo,1.1@/home/bar/baz
-ORBListenEndpoints 'uiop://1.1@/tmp/bar|foobar=300'
-ORBListenEndpoints 'uiop://|foobar=2'
-ORBListenEndpoints uiop://1.1@
-ORBListenEndpoints uiop://1.1@,1.0@/tmp/foo,1.1@
Since DIOP endpoints in TAO have the same form as IIOP endpoints, a detailed description is therefore omitted.
We recommend explicitly setting port numbers for endpoints since TAO does not support automatic selection of free endpoints for UDP sockets. Instead, the ORB will try to use the same default port number in every case.
TAO supports the following endpoint-specific options that apply only to DIOP endpoints:
Option | Availability | Description |
---|---|---|
portspan
|
TAO 2.5.12
|
The portspan option works identically to the
IIOP portspan option documented above.
The format for
|
Here are some additional examples of DIOP endoints:
-ORBListenEndpoints diop://1.0@foo1:2345
-ORBListenEndpoints diop://1.1@:1234
-ORBListenEndpoints diop://1.1@foo:2020/portspan=30
The SSLIOP pluggable protocol will actually create two endpoints: one which is meant to accept plain IIOP requests, and another meant to accept SSLIOP requests. As security measure, IIOP requests will be rejected by default unless the server is configured to accept them (See the SSLIOP documentation for additional details).
SSLIOP endpoints basically have the same format as
IIOP endpoints. The only difference between
the two is that SSLIOP endpoints accept an additional option
that allows one to select the port which will accept TLS
requests. To make a server open a SSLIOP endpoint on a specific
port use the ssl_port
endpoint option:
-ORBListenEndpoints iiop://foo:1234/ssl_port=1235
1234
and a SSLIOP endpoint on port
1235
. If no ssl_port
option is
supplied, a port will automatically be chosen in the same way a
port is automatically chosen for an IIOP
endpoint.
Note that the protocol label in the above example is
iiop
, not ssliop
.
Regardless, a SSLIOP endpoint will be opened if the SSLIOP
pluggable protocol was loaded. Furthermore, the
ssl_port
endpoint option is only valid if the
SSLIOP pluggable protocol is used.