ControlCommand » History » Version 21
Alex Afanasyev, 07/23/2014 04:15 PM
| 1 | 13 | Junxiao Shi | # Control Command |
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| 2 | 1 | Junxiao Shi | |
| 3 | 13 | Junxiao Shi | **Control Command** is a mechanism of [[Management|NFD Management protocol]]. |
| 4 | This document defines the request and response format of commands that can alter forwarder state, and how these commands should be signed and authenticated. |
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| 5 | This mechanism is useful for altering forwarder state. |
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| 6 | 1 | Junxiao Shi | |
| 7 | ## Request format |
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| 8 | 9 | Anonymous | |
| 9 | 21 | Alex Afanasyev | Control commands are [[ndn-cxx:SignedInterest|Signed Interests]] under `ndn:/localhost/nfd` prefix. |
| 10 | 11 | Alex Afanasyev | |
| 11 | 20 | Junxiao Shi | /localhost/nfd/<management-module>/<command-verb>/................./......................................... |
| 12 | \______ _______/ \__________________ ___________________/ |
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| 13 | \/ \/ |
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| 14 | ControlParameters Signed Interest additional components |
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| 15 | 1 | Junxiao Shi | |
| 16 | 13 | Junxiao Shi | A request Interest has 9 Name components. |
| 17 | These components are: |
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| 18 | 1 | Junxiao Shi | |
| 19 | 1. "localhost" in UTF-8 |
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| 20 | 2. "nfd" in UTF-8 |
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| 21 | 3. *management-module* in UTF-8, management module to which the command needs to be dispatched |
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| 22 | 4. *command-verb* in UTF-8, command to be executed |
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| 23 | 13 | Junxiao Shi | 5. *...*, a ControlParameters TLV block |
| 24 | 20 | Junxiao Shi | 6. timestamp of [Signed Interest](http://redmine.named-data.net/projects/ndn-cxx/wiki/SignedInterest) |
| 25 | 7. nonce of [Signed Interest](http://redmine.named-data.net/projects/ndn-cxx/wiki/SignedInterest) |
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| 26 | 8. SignatureInfo of [Signed Interest](http://redmine.named-data.net/projects/ndn-cxx/wiki/SignedInterest) |
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| 27 | 9. SignatureValue of [Signed Interest](http://redmine.named-data.net/projects/ndn-cxx/wiki/SignedInterest) |
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| 28 | 1 | Junxiao Shi | |
| 29 | 13 | Junxiao Shi | ### ControlParameters |
| 30 | 1 | Junxiao Shi | |
| 31 | 13 | Junxiao Shi | ControlParameters block contains arguments to the command. |
| 32 | 1 | Junxiao Shi | |
| 33 | 14 | Junxiao Shi | ControlParameters ::= CONTROL-PARAMETERS-TYPE TLV-LENGTH |
| 34 | Name? |
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| 35 | FaceId? |
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| 36 | Uri? |
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| 37 | LocalControlFeature? |
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| 38 | 19 | Junxiao Shi | Origin? |
| 39 | 1 | Junxiao Shi | Cost? |
| 40 | 19 | Junxiao Shi | Flags? |
| 41 | 17 | Junxiao Shi | Strategy? |
| 42 | ExpirationPeriod? |
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| 43 | 13 | Junxiao Shi | |
| 44 | // Name is defined in NDN-TLV spec |
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| 45 | |||
| 46 | 14 | Junxiao Shi | FaceId ::= FACE-ID-TYPE TLV-LENGTH |
| 47 | nonNegativeInteger |
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| 48 | 13 | Junxiao Shi | |
| 49 | 14 | Junxiao Shi | Uri ::= URI-TYPE TLV-LENGTH |
| 50 | RFC3986 URI in UTF-8 encoding |
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| 51 | 13 | Junxiao Shi | |
| 52 | 14 | Junxiao Shi | LocalControlFeature ::= LOCAL-CONTROL-FEATURE-TYPE TLV-LENGTH |
| 53 | nonNegativeInteger |
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| 54 | 13 | Junxiao Shi | |
| 55 | 19 | Junxiao Shi | Origin ::= ORIGIN-TYPE TLV-LENGTH |
| 56 | 17 | Junxiao Shi | nonNegativeInteger |
| 57 | |||
| 58 | 1 | Junxiao Shi | Cost ::= COST-TYPE TLV-LENGTH |
| 59 | nonNegativeInteger |
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| 60 | |||
| 61 | 19 | Junxiao Shi | Flags ::= FLAGS-TYPE TLV-LENGTH |
| 62 | nonNegativeInteger |
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| 63 | |||
| 64 | 17 | Junxiao Shi | Strategy ::= STRATEGY-TYPE TLV-LENGTH |
| 65 | Name |
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| 66 | |||
| 67 | ExpirationPeriod ::= EXPIRATION-PERIOD-TYPE TLV-LENGTH |
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| 68 | nonNegativeInteger |
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| 69 | 13 | Junxiao Shi | |
| 70 | 1 | Junxiao Shi | This definition exhausts all possible fields used in existing commands. |
| 71 | 13 | Junxiao Shi | |
| 72 | 1 | Junxiao Shi | Each individual command MUST specify: |
| 73 | 13 | Junxiao Shi | |
| 74 | * a list of required fields: those fields MUST be present |
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| 75 | * a list of optional fields: those fields MAY be present |
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| 76 | 1 | Junxiao Shi | * the semantics of each required and optional fields |
| 77 | 13 | Junxiao Shi | |
| 78 | 1 | Junxiao Shi | A field that is neither required nor optional for a command MUST NOT be present in a ControlParameter given to that command. |
| 79 | |||
| 80 | 17 | Junxiao Shi | Each individual command MAY impose additional constraints on certain fields. |
| 81 | 1 | Junxiao Shi | |
| 82 | ## Response format |
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| 83 | |||
| 84 | A response from the command interface is a Data that matches the request Interest. |
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| 85 | 13 | Junxiao Shi | The payload of this Data is a ControlResponse block. |
| 86 | 1 | Junxiao Shi | |
| 87 | ControlResponse ::= CONTROL-RESPONSE-TYPE TLV-LENGTH |
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| 88 | StatusCode |
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| 89 | StatusText |
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| 90 | 13 | Junxiao Shi | <body>? |
| 91 | 1 | Junxiao Shi | |
| 92 | StatusCode ::= STATUS-CODE-TYPE TLV-LENGTH |
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| 93 | nonNegativeInteger |
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| 94 | |||
| 95 | 13 | Junxiao Shi | StatusText ::= STATUS-TEXT-TYPE TLV-LENGTH |
| 96 | 2 | Junxiao Shi | string in UTF-8 |
| 97 | 1 | Junxiao Shi | |
| 98 | 20 | Junxiao Shi | <body> ::= zero or more arbitrary TLV blocks |
| 99 | 1 | Junxiao Shi | |
| 100 | 13 | Junxiao Shi | ### StatusCode |
| 101 | 2 | Junxiao Shi | |
| 102 | 16 | Junxiao Shi | StatusCode generally follows HTTP convention \[[RFC2616](http://tools.ietf.org/html/rfc2616#section-10)\]. |
| 103 | |||
| 104 | * Codes between 100 and 399 represents a success. |
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| 105 | * Codes between 400 and 499 represents a client error. |
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| 106 | * Codes between 500 and 599 represents a server error. |
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| 107 | |||
| 108 | 13 | Junxiao Shi | Common codes include: |
| 109 | 1 | Junxiao Shi | |
| 110 | StatusCode | Description |
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| 111 | -----------|------------------------ |
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| 112 | 13 | Junxiao Shi | 200 | OK |
| 113 | 2 | Junxiao Shi | 400 | ControlParameters is incorrect |
| 114 | 16 | Junxiao Shi | 403 | Command Interest is not authorized |
| 115 | 404 | Resource (e.g. face, prefix, ...) not found |
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| 116 | 19 | Junxiao Shi | 501 | Module or verb is not supported |
| 117 | 503 | Service not available |
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| 118 | 1 | Junxiao Shi | |
| 119 | Each individual command MAY define additional codes. |
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| 120 | 13 | Junxiao Shi | |
| 121 | 1 | Junxiao Shi | ### \<body> |
| 122 | 13 | Junxiao Shi | |
| 123 | 2 | Junxiao Shi | Additional elements are allowed at the end of ControlResponse. |
| 124 | 13 | Junxiao Shi | |
| 125 | 1 | Junxiao Shi | Each individual command MAY define the type and meaning of \<body>. |
| 126 | 14 | Junxiao Shi | |
| 127 | 1 | Junxiao Shi | Unless otherwise defined by an individual command, |
| 128 | 14 | Junxiao Shi | \<body> is the ControlParameters passed into this command for all successful responses, |
| 129 | 17 | Junxiao Shi | and \<body> is empty for all failure responses. |
| 130 | 14 | Junxiao Shi | |
| 131 | 1 | Junxiao Shi | ## TLV-TYPE assignments |
| 132 | 13 | Junxiao Shi | |
| 133 | 1 | Junxiao Shi | Type | Assigned value | Assigned value (hex) |
| 134 | ------------------------------------------- | ----------------- | -------------------- |
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| 135 | 13 | Junxiao Shi | ControlParameters | 104 | 0x68 |
| 136 | FaceId | 105 | 0x69 |
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| 137 | 1 | Junxiao Shi | Uri | 114 | 0x72 |
| 138 | 13 | Junxiao Shi | LocalControlFeature | 110 | 0x6e |
| 139 | 19 | Junxiao Shi | Origin | 111 | 0x6f |
| 140 | 1 | Junxiao Shi | Cost | 106 | 0x6a |
| 141 | 19 | Junxiao Shi | Flags | 108 | 0x6c |
| 142 | 17 | Junxiao Shi | Strategy | 107 | 0x6b |
| 143 | ExpirationPeriod | 109 | 0x6d |
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| 144 | 5 | Alex Afanasyev | ControlResponse | 101 | 0x65 |
| 145 | StatusCode | 102 | 0x66 |
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| 146 | StatusText | 103 | 0x67 |
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| 147 | 13 | Junxiao Shi | |
| 148 | These types are assigned from the range reserved for forwarding daemon. |