Introduction Framing Payloads APIs NMSG. Robert Edmonds Internet Systems Consortium, Inc. December 3, 2009
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1 Internet Systems Consortium, Inc. December 3, 2009
2 Introduction is a file and wire format for storing and transmitting blobs of information.
3 Introduction is a file and wire format for storing and transmitting blobs of information. Blobs of information on the order of 10-10,000 octets long.
4 Introduction is a file and wire format for storing and transmitting blobs of information. Blobs of information on the order of 10-10,000 octets long. Network transport optimized for UDP over jumbo frame Ethernet.
5 Introduction is a file and wire format for storing and transmitting blobs of information. Blobs of information on the order of 10-10,000 octets long. Network transport optimized for UDP over jumbo frame Ethernet. encoded using Google Protocol Buffers. Blobs typically encoded using GPB as well.
6 Constant length header part.
7 Constant length header part. Variable length part. One of:
8 Constant length header part. Variable length part. One of: One or more payloads.
9 Constant length header part. Variable length part. One of: One or more payloads. A fragment of a payload.
10 Constant length header part Magic value: N, M, S, G.
11 Constant length header part Magic value: N, M, S, G. Flags octet.
12 Constant length header part Magic value: N, M, S, G. Flags octet. FLAG FRAGMENT
13 Constant length header part Magic value: N, M, S, G. Flags octet. FLAG FRAGMENT FLAG ZLIB
14 Constant length header part Magic value: N, M, S, G. Flags octet. FLAG FRAGMENT FLAG ZLIB Version octet.
15 Constant length header part Magic value: N, M, S, G. Flags octet. FLAG FRAGMENT FLAG ZLIB Version octet. Current version is 2.
16 Constant length header part Magic value: N, M, S, G. Flags octet. FLAG FRAGMENT FLAG ZLIB Version octet. Current version is bit length of the variable length part of the message.
17 Flags FLAG FRAGMENT
18 Flags FLAG FRAGMENT The variable length part of the message is fragmented into multiple frames.
19 Flags FLAG FRAGMENT The variable length part of the message is fragmented into multiple frames. Used when the size of an payload exceeds the buffer size. ( buffer size is typically 8 KB for UDP sockets and 1 MB for files.)
20 Flags FLAG FRAGMENT The variable length part of the message is fragmented into multiple frames. Used when the size of an payload exceeds the buffer size. ( buffer size is typically 8 KB for UDP sockets and 1 MB for files.) Can t use IP fragmentation; max IP datagram size is 64 KB.
21 Flags FLAG FRAGMENT The variable length part of the message is fragmented into multiple frames. Used when the size of an payload exceeds the buffer size. ( buffer size is typically 8 KB for UDP sockets and 1 MB for files.) Can t use IP fragmentation; max IP datagram size is 64 KB. FLAG ZLIB
22 Flags FLAG FRAGMENT The variable length part of the message is fragmented into multiple frames. Used when the size of an payload exceeds the buffer size. ( buffer size is typically 8 KB for UDP sockets and 1 MB for files.) Can t use IP fragmentation; max IP datagram size is 64 KB. FLAG ZLIB The variable length part of the message has been compressed with zlib.
23 Flags FLAG FRAGMENT The variable length part of the message is fragmented into multiple frames. Used when the size of an payload exceeds the buffer size. ( buffer size is typically 8 KB for UDP sockets and 1 MB for files.) Can t use IP fragmentation; max IP datagram size is 64 KB. FLAG ZLIB The variable length part of the message has been compressed with zlib. FLAG FRAGMENT FLAG ZLIB
24 Flags FLAG FRAGMENT The variable length part of the message is fragmented into multiple frames. Used when the size of an payload exceeds the buffer size. ( buffer size is typically 8 KB for UDP sockets and 1 MB for files.) Can t use IP fragmentation; max IP datagram size is 64 KB. FLAG ZLIB The variable length part of the message has been compressed with zlib. FLAG FRAGMENT FLAG ZLIB The variable length part of the message has been compressed, then fragmented.
25 Payload header Vendor ID
26 Payload header Vendor ID Message type
27 Payload header Vendor ID Message type Timestamp
28 Payload header Vendor ID Message type Timestamp Optional classification
29 Payload header Vendor ID Message type Timestamp Optional classification Source
30 Payload header Vendor ID Message type Timestamp Optional classification Source Operator
31 Payload header Vendor ID Message type Timestamp Optional classification Source Operator Group
32 Payload The blob of information.
33 Payload The blob of information. Each (vendor ID, message type) tuple identifies a unique type of message.
34 Payload The blob of information. Each (vendor ID, message type) tuple identifies a unique type of message. Payload blobs can be encoded with GPB, but are not required to be.
35 libnmsg client API C library for applications that want to send, receive, read, write and process messages.
36 libnmsg client API C library for applications that want to send, receive, read, write and process messages. Includes single-threaded and multi-threaded input/output interfaces.
37 libnmsg client API C library for applications that want to send, receive, read, write and process messages. Includes single-threaded and multi-threaded input/output interfaces. Multi-threaded I/O code spreads deserialization load across multiple CPUs when using multiple inputs.
38 libnmsg client API C library for applications that want to send, receive, read, write and process messages. Includes single-threaded and multi-threaded input/output interfaces. Multi-threaded I/O code spreads deserialization load across multiple CPUs when using multiple inputs. Python and Perl bindings under development.
39 libnmsg message module interface Plugins can extend at run-time the messages types that libnmsg understands.
40 libnmsg message module interface Plugins can extend at run-time the messages types that libnmsg understands. Typically just protobuf-c generated object code plus glue.
41 libnmsg message module interface Plugins can extend at run-time the messages types that libnmsg understands. Typically just protobuf-c generated object code plus glue. Can be more complex: the ISC/dns message module uses hooks to pretty print the data fields used in DNS.
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