Ubuntu Manpage: amsrc - CCSDS Asynchronous Message Service MIB initialization file

NAME

       amsrc - CCSDS Asynchronous Message Service MIB initialization file

DESCRIPTION

The Management Information Base (MIB) for an AMS communicating entity (either amsd or an
AMS application module) must contain enough information to enable the entity to initiate
participation in AMS message exchange, such as the network location of the configuration
server and the roles and message subjects defined for some venture.

AMS entities automatically load their MIBs from initialization files at startup. When AMS
is built with the -DNOEXPAT compiler option set, the MIB initialization file must conform
to the amsrc syntax described below; otherwise the expat XML parsing library must be
linked into the AMS executable and the MIB initialization file must conform to the amsxml
syntax described in amsxml(5).

The MIB initialization file lists elements of MIB update information, each of which may
have one or more attributes. An element may also have sub-elements that are listed within
the declaration of the parent element, and so on.

The declaration of an element may occupy a single line of text in the MIB initialization
file or may extend across multiple files. A single-line element declaration is indicated
by a '*' in the first character of the line. The beginning of a multi-line element
declaration is indicated by a '+' in the first character of the line, while the end of
that declaration is indicated by a '-' in the first character of the line. In every case,
the type of element must be indicated by an element-type name beginning in the second
character of the line and terminated by whitespace. Every start-of-element line must be
matched by a subsequent end-of-element line that precedes the start of any other element
that is not a nested sub-element of this element.

Attributes are represented by whitespace-terminated <name>=<value> expressions immediately
following the element-type name on a '*' or '+' line. An attribute value that contains
whitespace must be enclosed within a pair of single-quote (') characters.

Two types of elements are recognized in the MIB initialization file: control elements and
configuration elements. A control element establishes the update context within which the
configuration elements nested within it are processed, while a configuration element
declares values for one or more items of AMS configuration information in the MIB.

Note that an aggregate configuration element (i.e., one which may contain other interior
configuration elements; venture, for example) may be presented outside of any control
element, simply to establish the context in which subsequent control elements are to be
interpreted.

CONTROL ELEMENTS

       ams_mib_init
           Initializes an empty MIB.  This element must be declared prior to the declaration of
           any other element.

           Sub-elements: none

           Attributes:

           continuum_nbr
               Identifies the local continuum.

           ptsname
               Identifies the primary transport service for the continuum.  Valid values include
               "dgr" and "udp".

           pubkey
               This is the name of the public key used for validating the digital signatures of
               meta-AMS messages received from the configuration server for this continuum.  The
               value of this attribute (if present) must identify a key that has been loaded into
               the ION security database, nominally by ionsecadmin(1).

           privkey
               This is the name of the private key used for constructing the digital signatures
               of meta-AMS messages sent by the configuration server for this continuum.  This
               attribute should only be present in the MIB initialization file for amsd().  The
               value of this attribute (if present) must identify a key that has been loaded into
               the ION security database, nominally by ionsecadmin(1).

       ams_mib_add
           This element contains a list of configuration items that are to be added to the MIB.

       ams_mib_change
           This element contains a list of configuration items that are to be revised in the MIB.

       ams_mib_delete
           This element contains a list of configuration items that are to be deleted from the
           MIB.

CONFIGURATION ELEMENTS

continuum
Identifies a known remote continuum.

Sub-elements: none

Attributes:

nbr Identifies the local continuum.

name
Identifies the local continuum.

neighbor
1 if the continuum is a neighbor of the local continuum, zero otherwise.

desc
A textual description of this continuum.

csendpoint
Identifies one of the network locations at which the configuration server may be
reachable. If the configuration server might be running at any one of several
locations, the number of other locations that are preferred to this one is noted; in
this case, csendpoints must be listed within the ams_mib_add element in descending
order of preference, i.e., with the most preferred network location listed first.

Sub-elements: none

Attributes:

epspec
Identifies the endpoint at which the configuration server may be reachable. The
endpoint specification must conform the endpoint specification syntax defined for
the continuum's primary transport service; see the AMS Blue Book for details.

after
If present, indicates the number of other configuration server network locations
that are considered preferable to this one. This attribute is used to ensure that
csendpoints are listed in descending order of preference.

amsendpoint
Normally the specifications of the transport service endpoints at which an AMS
application module can receive messages are computed automatically using standard
transport-service-specific rules. However, in some cases it might be necessary for a
module to receive messages at one or more non-standard endpoints; in these cases,
amsendpoint elements can be declared in order to override the standard endpoint
specification rules.

Sub-elements: none

Attributes:

tsname
Identifies the transport service for which a non-standard endpoint specification
is being supplied.

epspec
Identifies an endpoint at which the application module will be reachable, in the
context of the named transport service. The endpoint specification must conform
the endpoint specification syntax defined for the named transport service; see the
AMS Blue Book for details.

application
Identifies one of the applications supported within this continuum.

Sub-elements: none

Attributes:

name
Identifies the application.

pubkey
This is the name of the public key used for validating the digital signatures of
meta-AMS messages received from the registrars for all cells of any message space
in this continuum that is characterized by this application name. The value of
this attribute (if present) must identify a key that has been loaded into the ION
security database, nominally by ionsecadmin(1).

privkey
This is the name of the private key used for constructing the digital signatures
of meta-AMS messages sent by the registrars for all cells of any message space in
this continuum that is characterized by this application name. This attribute
should only be present in the MIB initialization file for amsd(). The value of
this attribute (if present) must identify a key that has been loaded into the ION
security database, nominally by ionsecadmin(1).

venture
Identifies one of the ventures operating within the local continuum.

Sub-elements: role, subject, unit, msgspace

Attributes:

nbr Identifies the venture.

appname
Identifies the application addressed by this venture.

authname
Identifies the authority under which the venture operates, distinguishing this
venture from all other ventures that address the same application.

gweid
Identifies the RAMS network endpoint ID of the RAMS gateway module for this
venture's message space in the local continuum. Gateway endpoint ID is expressed
as <protocol_name>@<eid_string> where protocol_name is either "bp" or "udp". If
protocol name is "bp" then eid_string must be a valid Bundle Protocol endpoint ID;
otherwise, eid_string must be of the form <hostname>:<port_number>. If the gweid
attribute is omitted, the RAMS gateway module's RAMS network endpoint ID defaults
to "bp@ipn:<local_continuum_number>.<venture_number>".

net_config
Has the value "tree" if the RAMS network supporting this venture is configured as
a tree; otherwise "mesh", indicating that the RAMS network supporting this venture
is configured as a mesh.

root_cell_resync_period
Indicates the number of seconds in the period on which resynchronization is
performed for the root cell of this venture's message space in the local
continuum. If this attribute is omitted, resynchronization in that cell is
disabled.

role
Identifies one of the functional roles in the venture that is the element that's
currently being configured.

Sub-elements: none

Attributes:

nbr Identifies the role.

name
Identifies the role.

authname
Identifies the authority under which the venture operates, distinguishing this
venture from all other ventures that address the same application.

pubkey
This is the name of the public key used for validating the digital signatures of
meta-AMS messages received from all application modules that register in this
functional role. The value of this attribute (if present) must identify a key
that has been loaded into the ION security database, nominally by ionsecadmin(1).

privkey
This is the name of the private key used for constructing the digital signatures
of meta-AMS messages sent by all application modules that register in this
functional role. This attribute should only be present in the MIB initialization
file for application modules that register in this role. The value of this
attribute (if present) must identify a key that has been loaded into the ION
security database, nominally by ionsecadmin(1).

subject
Identifies one of the subjects on which messages may be sent, within the venture that
is the element that's currently being configured.

Sub-elements: sender, receiver

Attributes:

nbr Identifies the subject.

name
Identifies the subject.

desc
A textual description of this message subject.

symkey
This is the name of the symmetric key used for both encrypting and decrypting the
content of messages on this subject; if omitted, messages on this subject are not
encrypted by AMS. If authorized senders and receivers are defined for this
subject, then this attribute should only be present in the MIB initialization file
for application modules that register in roles that appear in the subject's lists
of authorized senders and/or receivers. The value of this attribute (if present)
must identify a key that has been loaded into the ION security database, nominally
by ionsecadmin(1).

marshal
This is the name associated with the content marshaling function defined for this
message subject. If present, whenever a message on this subject is issued the
associated function is automatically called to convert the supplied content data
to a platform-independent representation for transmission; this conversion occurs
before any applicable content encryption is performed. If omitted, content data
are transmitted without conversion to a platform-independent representation.
Marshaling functions are defined in the marshalRules table in the marshal.c source
file.

unmarshal
This is the name associated with the content unmarshaling function defined for
this message subject. If present, whenever a message on this subject is received
the associated function is automatically called to convert the transmitted content
to local platform-specific representation; this conversion occurs after any
applicable content decryption is performed. If omitted, received content data are
delivered without conversion to a local platform-specific representation.
Unmarshaling functions are defined in the unmarshalRules table in the marshal.c
source file.

sender
Identifies one of the roles in which application modules must register in order to be
authorized senders of messages on the subject that is the element that's currently
being configured.

Sub-elements: none

Attributes:

name
Identifies the sender. The value of this attribute must be the name of a role
that has been defined for the venture that is currently being configured.

receiver
Identifies one of the roles in which application modules must register in order to be
authorized receivers of messages on the subject that is the element that's currently
being configured.

Sub-elements: none

Attributes:

name
Identifies the receiver. The value of this attribute must be the name of a role
that has been defined for the venture that is currently being configured.

unit
Identifies one of the organizational units within the venture that is the element
that's currently being configured.

Sub-elements: none

Attributes:

nbr Identifies the venture.

name
Identifies the venture.

resync_period
Indicates the number of seconds in the period on which resynchronization is
performed, for the cell of this venture's message space that is the portion of the
indicated unit which resides in the local continuum. If this attribute is
omitted, resynchronization in that cell is disabled.

msgspace
Identifies one of the message spaces in remote continua that are encompassed by the
venture that is the element that's currently being configured.

Sub-elements: none

Attributes:

nbr Identifies the remote continuum within which the message space operates.

gweid
Identifies the RAMS network endpoint ID of the RAMS gateway module for this
message space. Gateway endpoint ID is expressed as <protocol_name>@<eid_string>
where protocol_name is either "bp" or "udp". If protocol name is "bp" then
eid_string must be a valid Bundle Protocol endpoint ID; otherwise, eid_string must
be of the form <hostname>:<port_number>. If the gweid attribute is omitted, the
RAMS network endpoint ID of the message space's RAMS gateway module defaults to
"bp@ipn:<remote_continuum_number>.<venture_number>".

symkey
This is the name of the symmetric key used for both encrypting and decrypting all
messages to and from modules in the remote message space that are forwarded
between the local RAMS gateway server and modules in the local message space; if
omitted, these messages are not encrypted. The value of this attribute (if
present) must identify a key that has been loaded into the ION security database,
nominally by ionsecadmin(1).

EXAMPLE

       *ams_mib_init continuum_nbr=2 ptsname=dgr

       +ams_mib_add

       *continuum nbr=1 name=apl desc=APL

       *csendpoint epspec=beaumont.stepsoncats.com:2357

       *application name=amsdemo

       +venture nbr=1 appname=amsdemo authname=test

       *role nbr=2 name=shell

       *role nbr=3 name=log

       *role nbr=4 name=pitch

       *role nbr=5 name=catch

       *role nbr=6 name=benchs

       *role nbr=7 name=benchr

       *role nbr=96 name=amsd

       *role nbr=97 name=amsmib

       *role nbr=98 name=amsstop

       *subject nbr=1 name=text desc='ASCII text'

       *subject nbr=2 name=noise desc='more ASCII text'

       *subject nbr=3 name=bench desc='numbered msgs'

       *subject nbr=97 name=amsmib desc='MIB updates'

       *subject nbr=98 name=amsstop desc='shutdown'

       *unit nbr=1 name=orbiters

       *unit nbr=2 name=orbiters.near

       *unit nbr=3 name=orbiters.far

       *msgspace nbr=2

       -venture

       -ams_mib_add

NAME

DESCRIPTION

CONTROL ELEMENTS

CONFIGURATION ELEMENTS

EXAMPLE

SEE ALSO