This is tftp-hpa-0.21; this version was put out by H. Peter Anvin
<hpa@zytor.com>.

The latest version of this collection can be found at:

    ftp://ftp.kernel.org/pub/software/network/tftp/

This software can be discussed on the SYSLINUX mailing list.  To
subscribe, send a message containing the word "subscribe" in the body
to <syslinux-request@linux.kernel.org>.

Please note that my main focus in this work is the tftpd
server. Although a tftp client is included, it is by and large the
stock OpenBSD version, with a small handful of portability
improvements.


===> IMPORTANT: SEE THE FILE "README.security" FOR IMPORTANT SECURITY
===> CHANGES ENACTED IN VERSION 0.17!!!!!!!!!

Changes in 0.21:
	Support running in standalone mode, without inetd.

	Even more portability improvements.  Now known to compile and
	run on Linux, Solaris 5, 5.1, 6, 7 and 8, and AIX.  Reports of
	success or failure on other modern systems always appreciated.

	Clean and modernize some really ugly old code.

	Fix a potential illegal memory access when running in "totally
	insecure mode" - no -s, no directories listed.


Changes in 0.20:
	Portability improvements.  Now known to compile and run on
	Solaris 8.


Changes in 0.19:
	Fork before performing tcpwrappers check.

	Don't rely on nonstandard bsd_signal() function, instead
	require that the platform has sigaction().  This is 2001,
	after all.  This may resolve some potential portability
	problems.

	Log a message if memory allocation fails, instead of dying
	silently.

	Clean up the main dispatch loop.

	Use <sysexits.h> for exit codes, if it exists.

	Add support for debugging remapping rulefiles; if logging with
	-vvv tftpd will log all rules actions.

	Correct the error code issued by an "abort" rule.


Changes in 0.18:
	Support (almost) arbitrary filename remappings via regular
	expression-based rulesets.

	Added -v option for more verbose logging.


Changes in 0.17:

	Add support for tcpwrapper checking (/etc/hosts.allow;
	/etc/hosts.deny) in tftpd.

	Compile correctly on glibc 2.1.2.

	Add -u option to specify the user id to run as (default
	"nobody".)

	Operate in "daemon mode" as long as we keep getting requests.
	This should speed up handling large amounts of requests at
	once, as can happen when a client starts up, and avoids inetd
	misconfiguration problems.
	

Changes in 0.16:

	Correct massive lossage from 0.15: apparently 0.15 was based
	on an out-of-date CVS repository, somehow.

	Fix for ACKs in TFTP PUT; patch by Roger Venning.


Changes in 0.15:

	If the operating system allows, try to obtain the local
	address used for the request packet, and reply using the same
	local IP address.  Some embedded TFTP clients are (probably
	incorrectly) picky about this.


Changes in 0.14:

	Hacks to signal handling to avoid "zombie servers."


Changes in 0.13:

	Added the non-standard option "blksize2".  The "blksize"
	option is limited in its usability, since TFTP is designed to
	be implemented in a ROM, and ROM code might find it painful to
	deal with packets that don't meet certain alignment
	restrictions.

	The "blksize2" option tells the server that the block size
	must be a power of 2 to be usable to the client.  The server
	SHALL respond with a block size that is a power of two, up to
	a maximum of 32768, or reject the option.  Furthermore, the
	server SHALL grant a block size that is no smaller than 512
	bytes unless the client explicitly requested a smaller block
	size.  If the client request both options, the server MAY
	accept one or the other, but not both.  At some point I will
	probably write up an IETF draft for this option.


General information on the tftp-hpa series:

This is a conglomerate of a number of versions of the BSD TFTP code,
ported to Linux, although it should work on mostly any POSIX-compliant
OS with sockets.  You may have to use GNU make to build it.

The core software was taken from OpenBSD (CVS source as of
1999-09-21).  I believe this was the most secure source base available
at the time I obtained this code, and it included support for the -s
and -c options.

The un-BSD-ized Makefiles and a lot of the configure macros were taken
from netkit-tftp-0.10 by David Holland; I also followed this example
and modernized the code style throughout.

Patches by Markus Gutschke and Gero Kuhlmann were the basis for the
option negotiation as well as the "blksize" and "tsize" option
support, although I made a fair amount of mostly stylistic changes to
their code.

Adding the -r option (disable a specific option), the "timeout"
option, converting to using autoconf for setup, and any additions
listed in the Changes list above, has all been my own code, as are any
bugs introduced in the merge.

