udp-receiver - receive files broadcast by udp-sender

./udp-receiver [--file file] [--pipe pipe] [--portbase portbase] [--interface net-interface] [--log file] [--ttl time-to-live] [--mcast-all-addr mcast-all-address] [--nokbd] [--exitWait milliseconds]

CWUdp-receiver is used to receive files sent by CWudp-sender (for instance a disk image).

--file file

Writes received data to file. If this parameter is not supplied, received data is written to stdout instead.

--pipe command

Sends data through pipe after receiving it. This is useful for decompressing the data, or for filling in unused filesystem blocks that may have been stripped out by udp-sender. The command gets a direct handle on the output file or device, and thus may seek inside it, if needed. CWUdpcast itself also keeps a handle on the file, which is used for an informational progress display. The command's stdin is a pipe from udp-receiver. Example: CWudp-receiver -p "gzip -dc"

--log file

Logs some stuff into file.

--nosync

Do not open target in synchronous mode. Useful when dumping to an image file on a mounted filesystem, rather than to a raw partition.

--nokbd

Do not read start signal from keyboard, and do not display any message telling the user to press any key to start.

--portbase portbase

Default ports to use for udpcast. Two ports are used: portbase and portbase+1 . Thus, Portbase must be even. Default is CW9000. The same portbase must be specified for both CWudp-sender and CWudp-receiver.

--interface interface

Network interface used to send out the data. Default is CWeth0

--ttl ttl

Time to live for connection request packet (by default connection request is broadcast to the LAN's broadcast address. If ttl is set, the connection request is multicast instead to CW224.0.0.1 with the given ttl, which should enable udpcast to work between LANs. Not tested though.

--mcast-all-addr address

Uses a non-standard multicast address for the control connection (which is used by the sender and receivers to find each other). This is not the address that is used to transfer the data. By default CWmcast-all-addr is the Ethernet broadcast address if CWttl is 1, and CW224.0.0.1 otherwise. This setting should not be used except in very special situations, such as when CW224.0.0.1 cannot be used for policy reasons.

--exitWait milliseconds

When transmission is over, receiver will wait for this time after receiving the final REQACK. This is done in order to guard against loss of the final ACK. Is 500 milliseconds by default.

udp-sender

Alain Knaff