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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 lines. 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 remote continuum.

    • name

      Identifies the remote 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 to 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 to 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 unit.

    • name

      Identifies the unit.

    • 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).

    • neighbor

      Signifies adjacency of the message space with the parent continuum using a Boolean value (i.e. 1 is adjacent, 0 is non-adjacent). Note that in this context message space is analogous to continuum. If the neighbor attribute is omitted the default value is 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=1 neighbor=1

*msgspace nbr=2 neighbor=0

-venture

-ams_mib_add

SEE ALSO

amsxml(5)