forked from mirrors/tftp-hpa-google
141 lines
4.4 KiB
Text
141 lines
4.4 KiB
Text
This is tftp-hpa-0.21; this version was put out by H. Peter Anvin
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<hpa@zytor.com>.
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The latest version of this collection can be found at:
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ftp://ftp.kernel.org/pub/software/network/tftp/
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This software can be discussed on the SYSLINUX mailing list. To
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subscribe, send a message containing the word "subscribe" in the body
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to <syslinux-request@linux.kernel.org>.
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Please note that my main focus in this work is the tftpd
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server. Although a tftp client is included, it is by and large the
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stock OpenBSD version, with a small handful of portability
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improvements.
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===> IMPORTANT: SEE THE FILE "README.security" FOR IMPORTANT SECURITY
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===> CHANGES ENACTED IN VERSION 0.17!!!!!!!!!
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Changes in 0.21:
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Support running in standalone mode, without inetd.
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Even more portability improvements. Now known to compile
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and run on Solaris 5, 5.1, 6 and 7 as well as 8.
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Changes in 0.20:
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Portability improvements. Now known to compile and run on
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Solaris 8.
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Changes in 0.19:
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Fork before performing tcpwrappers check.
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Don't rely on nonstandard bsd_signal() function, instead
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require that the platform has sigaction(). This is 2001,
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after all. This may resolve some potential portability
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problems.
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Log a message if memory allocation fails, instead of dying
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silently.
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Clean up the main dispatch loop.
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Use <sysexits.h> for exit codes, if it exists.
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Add support for debugging remapping rulefiles; if logging with
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-vvv tftpd will log all rules actions.
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Correct the error code issued by an "abort" rule.
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Changes in 0.18:
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Support (almost) arbitrary filename remappings via regular
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expression-based rulesets.
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Added -v option for more verbose logging.
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Changes in 0.17:
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Add support for tcpwrapper checking (/etc/hosts.allow;
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/etc/hosts.deny) in tftpd.
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Compile correctly on glibc 2.1.2.
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Add -u option to specify the user id to run as (default
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"nobody".)
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Operate in "daemon mode" as long as we keep getting requests.
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This should speed up handling large amounts of requests at
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once, as can happen when a client starts up, and avoids inetd
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misconfiguration problems.
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Changes in 0.16:
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Correct massive lossage from 0.15: apparently 0.15 was based
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on an out-of-date CVS repository, somehow.
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Fix for ACKs in TFTP PUT; patch by Roger Venning.
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Changes in 0.15:
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If the operating system allows, try to obtain the local
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address used for the request packet, and reply using the same
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local IP address. Some embedded TFTP clients are (probably
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incorrectly) picky about this.
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Changes in 0.14:
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Hacks to signal handling to avoid "zombie servers."
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Changes in 0.13:
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Added the non-standard option "blksize2". The "blksize"
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option is limited in its usability, since TFTP is designed to
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be implemented in a ROM, and ROM code might find it painful to
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deal with packets that don't meet certain alignment
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restrictions.
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The "blksize2" option tells the server that the block size
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must be a power of 2 to be usable to the client. The server
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SHALL respond with a block size that is a power of two, up to
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a maximum of 32768, or reject the option. Furthermore, the
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server SHALL grant a block size that is no smaller than 512
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bytes unless the client explicitly requested a smaller block
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size. If the client request both options, the server MAY
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accept one or the other, but not both. At some point I will
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probably write up an IETF draft for this option.
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General information on the tftp-hpa series:
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This is a conglomerate of a number of versions of the BSD TFTP code,
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ported to Linux, although it should work on mostly any POSIX-compliant
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OS with sockets. You may have to use GNU make to build it.
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The core software was taken from OpenBSD (CVS source as of
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1999-09-21). I believe this was the most secure source base available
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at the time I obtained this code, and it included support for the -s
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and -c options.
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The un-BSD-ized Makefiles and a lot of the configure macros were taken
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from netkit-tftp-0.10 by David Holland; I also followed this example
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and modernized the code style throughout.
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Patches by Markus Gutschke and Gero Kuhlmann were the basis for the
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option negotiation as well as the "blksize" and "tsize" option
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support, although I made a fair amount of mostly stylistic changes to
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their code.
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Adding the -r option (disable a specific option), the "timeout"
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option, converting to using autoconf for setup, and any additions
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listed in the Changes list above, has all been my own code, as are any
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bugs introduced in the merge.
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