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ReadMe.txt 2014-12-31 6.5 kB 22 weekly downloads
--== UFTP - Encrypted UDP based FTP with multicast ==-- UFTP is an encrypted multicast file transfer program, designed to securely, reliably, and efficiently transfer files to multiple receivers simultaneously. This is useful for distributing large files to a large number of receivers, and is especially useful for data distribution over a satellite link (with two way communication), where the inherent delay makes any TCP based communication highly inefficient. The multicast encryption scheme is based on TLS with extensions to allow multiple receivers to share a common key. UFTP also has the capability to communicate over disjoint networks separated by one or more firewalls (NAT traversal) and without full end-to-end multicast capability (multicast tunneling) through the use of a UFTP proxy server. These proxies also provide scalability by aggregating responses from a group of receivers. --== Building ==-- UNIX-like systems require GNU make and a C compiler such as GCC or equivalent. Windows systems require Visual Studio Express 2010 or later. Non-Windows systems require OpenSSL to be installed if encryption support is enabled. On Linux, Solaris, and BSD systems (including MacOSX), this should be included with the OS. To compile for UNIX-like systems, including MacOSX: make [ OPENSSL={install directory for OpenSSL} ] [ NO_ENCRYPTION=1 ] [ NO_EC=1 ] To compile for Windows (from a Visual Studio command prompt): nmake -f makefile.mak [ OPENSSL={install directory for OpenSSL} ] [ NO_ENCRYPTION=1 ] [ WINXP=1 ] The OPENSSL parameter to make should only need to be specified if OpenSSL is installed in a non-standard location, or on systems where it isn't preinstalled. The NO_ENCRYPTION flag compiles with no encryption support. This can be useful in embedded environments that don't need encryption and want to keep the size of the executable down, and for use in a Windows service that doesn't require encryption. The NO_EC flag compiles without support for Elliptic Curve crypto. This may be required if either you have an older version of OpenSSL or the build of OpenSSL installed wasn't configured with ECC support. The WINXP flag is used on Windows systems to disable features requiring Windows Vista or Windows 7. This includes dual stack IPv4/IPv6 sockets as well as the CNG API which supports Elliptic Curve crypto, larger hash sizes, and authenticated mode ciphers. To install for UNIX-like systems, including MacOSX: make [ DESTDIR={install directory} ] install The DESTDIR parameter allows installing into a fake root directory, which can be useful for packaging utilities such as rpm. --== Tuning ==-- If you find that clients can't receive data fast enough, or if servers communicating with several hundred clients can't handle the flood of STATUS messages that come in, you can increase the UDP send/receive buffer size to help with this. This is set using the -B option on server, client, or proxy. However, many operating systems impose a maximum value of 256K (262144). This limit can be increased, although the method is OS specific. Here are a few common ones: Solaris: ndd -set /dev/udp udp_max_buf {value} Linux: sysctl -w net.core.rmem_max={value} sysctl -w net.core.wmem_max={value} MacOSX / FreeBSD: sysctl -w kern.ipc.maxsockbuf={value} (The actual maximum you can use is 8/9 of this value) While Windows does not have this limitation, Windows XP Service Pack 3 and later does throttle back UDP datagrams larger that 1024 bytes by default (a UFTP packet is 1472 bytes by default). This is most commonly seen when attempting to move data at 100 Mbps or more. You can change this by adding/modifying the following registry value: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AFD\Parameters\FastSendDatagramThreshold Set this DWORD value to 1500 and reboot, and it should take care of the issue. If you're making use of the DSCP/TOS byte in the IP header, this can be modified via the -Q option to the server, client, or proxy. On Windows XP systems, this can't be modified by default using portable libriaries. This can be overridden by adding/modifying the following registry value: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\DisableUserTOSSetting Set this DWORD value to 0 and reboot, and the -Q option should work. Windows Vista and Windows 7 don't support this particular mechanism at all, and each has it's own way of doing it. For now, this option does not work on these OSs. The TOS byte also contains the ECN bits, which are used by the TFMCC congestion control scheme, so restrictions on the TOS byte also affect the sender support for ECN. --== Running under Windows ==-- UFTP was originally written to run in a UNIX/Linux environment, so it doesn't natively do things that other Windows servers do such as run in the background or run as a Windows service. Included with UFTP are hidedos.exe, instsrv.exe, and srvany.exe which allows these things to happen. Hidedos is a utility originally written by LANDesk to allow command line windows programs to run in the background. Instsrv and srvany are components of the Windows Resource Kit which. Instsrv is used to install and remove services, and srvany allows programs not written as windows services to run as such. To run the uftpd client or proxy without leaving a command prompt open (the -d option tells uftpd to run in the foreground, so don't use this option in this case): hidedos uftpd [options] -- or -- hidedos uftpproxyd [options] To run the uftpd client as a Windows service: (steps for the proxy are similar) Copy instsrv.exe and srvany.exe to the system folder (usually C:\Windows\system32) Install the service: instsrv UFTPD c:\windows\system32\srvany.exe Configure the service: Open regedit and go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UFTPD Right-click the UFTPD key and choose New > Key. Name the key Parameters. Right-click the new Parameters key under UFTP and choose New > String Value. Name the string Application. Double-click the Application value and fill in the full command line to uftpd Once configured, the service should start. In the task list, you'll see both srvany.exe and uftpd.exe running while the service is up. If you need to remove the service: instsrv UFTPD remove
Source: ReadMe.txt, updated 2014-12-31