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* fhandler.h (class fhandler_socket): Add saw_reuseaddr status flag.

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* fhandler_socket.cc (fhandler_socket::bind): Set socket to
	SO_EXCLUSIVEADDRUSE if application didn't explicitely set SO_REUSEADDR
	socket option, on systems supporting SO_EXCLUSIVEADDRUSE.
	* net.cc (cygwin_setsockopt): Set fhandler's saw_reuseaddr status flag
	if SO_REUSEADDR socket option has been successsfully set.
	* wincap.h (wincaps::has_exclusiveaddruse): New element.
	* wincap.cc: Implement above element throughout.
This commit is contained in:
Corinna Vinschen
2006-01-29 12:23:44 +00:00
parent 74d3f96faa
commit 5369605f4f
6 changed files with 69 additions and 16 deletions
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29
winsup/cygwin/fhandler_socket.cc
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@@ -661,10 +661,33 @@ fhandler_socket::bind (const struct sockaddr *name, int namelen)
}
#undef un_addr
}
else if (::bind (get_socket (), name, namelen))
set_winsock_errno ();
else
res = 0;
{
/* If the application didn't explicitely call setsockopt (SO_REUSEADDR),
enforce exclusive local address use using the SO_EXCLUSIVEADDRUSE
socket option, to emulate POSIX socket behaviour more closely.
KB 870562: Note that this option is only available since NT4 SP4.
Also note that a bug in Win2K SP1-3 and XP up to SP1 only enables
this option for users in the local administrators group. */
if (wincap.has_exclusiveaddruse ())
{
if (!saw_reuseaddr ())
{
int on = 1;
int ret = ::setsockopt (get_socket (), SOL_SOCKET,
~(SO_REUSEADDR),
(const char *) &on, sizeof on);
debug_printf ("%d = setsockopt (SO_EXCLUSIVEADDRUSE), %E", ret);
}
else
debug_printf ("SO_REUSEADDR set");
}
if (::bind (get_socket (), name, namelen))
set_winsock_errno ();
else
res = 0;
}
out:
return res;