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tftpd: try to handle duplicate WRQ packets

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Duplicate WRQ packets can really hurt, since they end up accessing the
same file.  This attempts to lock the file, which should work for the
case where a correctly implemented TFTP stack uses the same session ID
(port number) for each retry; in any other case they look like
multiple sessions to the same file and it is a crapshoot if we end up
with the correct one.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin 2011-05-12 19:16:17 -07:00
parent 05ffcecaa8
commit 2864d83fea
2 changed files with 43 additions and 11 deletions
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6
configure.in
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@ -46,6 +46,7 @@ AC_CHECK_HEADERS(strings.h)
AC_CHECK_HEADERS(sysexits.h)
AC_CHECK_HEADERS(time.h)
AC_CHECK_HEADERS(unistd.h)
AC_CHECK_HEADERS(sys/file.h)
AC_CHECK_HEADERS(sys/filio.h)
AC_CHECK_HEADERS(sys/stat.h)
AC_CHECK_HEADERS(sys/time.h)
@ -140,6 +141,11 @@ PA_HEADER_DEFINES(fcntl.h, int, O_NONBLOCK)
PA_HEADER_DEFINES(fcntl.h, int, O_BINARY)
PA_HEADER_DEFINES(fcntl.h, int, O_TEXT)
PA_HEADER_DEFINES(fcntl.h, int, F_SETLK)
PA_HEADER_DEFINES(sys/file.h, int, LOCK_SH)
PA_HEADER_DEFINES(sys/file.h, int, LOCK_EX)
AH_TEMPLATE([HAVE_SIGSETJMP],
[Define if we have sigsetjmp, siglongjmp and sigjmp_buf.])
PA_SIGSETJMP([AC_DEFINE(HAVE_SIGSETJMP)])