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brsccla - Online in the Cloud

Run brsccla in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command brsccla that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


brsccla - BRSC-based BP convergence layer adapter (input and output) task

SYNOPSIS


brsccla server_hostname[:server_port_nbr]_own_node_nbr

DESCRIPTION


BRSC is the "client" side of the Bundle Relay Service (BRS) convergence layer protocol for
BP. It is complemented by BRSS, the "server" side of the BRS convergence layer protocol
for BP. BRS clients send bundles directly only to the server, regardless of their final
destinations, and the server forwards them to other clients as necessary.

brsccla is a background "daemon" task comprising three threads: one that connects to the
BRS server, spawns the other threads, and then handles BRSC protocol output by
transmitting bundles over the connected socket to the BRS server; one that simply sends
periodic "keepalive" messages over the connected socket to the server (to assure that
local inactivity doesn't cause the connection to be lost); and one that handles BRSC
protocol input from the connected server.

The output thread connects to the server's TCP socket at server_hostname and
server_port_nbr, sends over the connected socket the client's own_node_nbr (in SDNV
representation) followed by a 32-bit time tag and a 160-bit HMAC-SHA1 digest of that time
tag, to authenticate itself; checks the authenticity of the 160-bit countersign returned
by the server; spawns the keepalive and receiver threads; and then begins extracting
bundles from the queues of bundles ready for transmission via BRSC and transmitting those
bundles over the connected socket to the server. Each transmitted bundle is preceded by
its length, a 32-bit unsigned integer in network byte order. The default value for
server_port_nbr, if omitted, is 80.

The reception thread receives bundles over the connected socket and passes them to the
bundle protocol agent on the local ION node. Each bundle received on the connection is
preceded by its length, a 32-bit unsigned integer in network byte order.

The keepalive thread simply sends a "bundle length" value of zero (a 32-bit unsigned
integer in network byte order) to the server once every 15 seconds.

Note that brsccla is not a "promiscuous" convergence layer daemon: it can transmit bundles
only to the BRS server to which it is connected, so scheme configuration directives that
cite this outduct need only provide the protocol name and the BRSC outduct name as
specified on the command line when brsccla is started.

brsccla is spawned automatically by bpadmin in response to the 's' (START) command that
starts operation of the Bundle Protocol, and it is terminated by bpadmin in response to an
'x' (STOP) command. brsccla can also be spawned and terminated in response to START and
STOP commands that pertain specifically to the BRSC convergence layer protocol.

EXIT STATUS


"0" brsccla terminated normally, for reasons noted in the ion.log file. If this
termination was not commanded, investigate and solve the problem identified in the log
file and use bpadmin to restart the BRSC protocol.

"1" brsccla terminated abnormally, for reasons noted in the ion.log file. Investigate and
solve the problem identified in the log file, then use bpadmin to restart the BRSC
protocol.

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