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bpo-32394: Remove some TCP options on old version Windows. (GH-5523)

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animalize 2018-02-27 02:10:36 +08:00 • committed by Steve Dower
parent 3f2e6f15d6
commit 19e7d48ce8
4 changed files with 101 additions and 0 deletions
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70
Modules/socketmodule.c
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@ -305,6 +305,70 @@ http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/net/getaddrinfo.c.diff?r1=1.82&
/* Provides the IsWindows7SP1OrGreater() function */
#include <VersionHelpers.h>
/* remove some flags on older version Windows during run-time.
https://msdn.microsoft.com/en-us/library/windows/desktop/ms738596.aspx */
typedef struct {
DWORD build_number; /* available starting with this Win10 BuildNumber */
const char flag_name[20];
} FlagRuntimeInfo;
/* IMPORTANT: make sure the list ordered by descending build_number */
static FlagRuntimeInfo win_runtime_flags[] = {
/* available starting with Windows 10 1709 */
{16299, "TCP_KEEPIDLE"},
{16299, "TCP_KEEPINTVL"},
/* available starting with Windows 10 1703 */
{15063, "TCP_KEEPCNT"},
/* available starting with Windows 10 1607 */
{14393, "TCP_FASTOPEN"}
};
static void
remove_unusable_flags(PyObject *m)
{
PyObject *dict;
OSVERSIONINFOEX info;
DWORDLONG dwlConditionMask;
dict = PyModule_GetDict(m);
if (dict == NULL) {
return;
}
/* set to Windows 10, except BuildNumber. */
memset(&info, 0, sizeof(info));
info.dwOSVersionInfoSize = sizeof(info);
info.dwMajorVersion = 10;
info.dwMinorVersion = 0;
/* set Condition Mask */
dwlConditionMask = 0;
VER_SET_CONDITION(dwlConditionMask, VER_MAJORVERSION, VER_GREATER_EQUAL);
VER_SET_CONDITION(dwlConditionMask, VER_MINORVERSION, VER_GREATER_EQUAL);
VER_SET_CONDITION(dwlConditionMask, VER_BUILDNUMBER, VER_GREATER_EQUAL);
for (int i=0; i<sizeof(win_runtime_flags)/sizeof(FlagRuntimeInfo); i++) {
info.dwBuildNumber = win_runtime_flags[i].build_number;
/* greater than or equal to the specified version?
Compatibility Mode will not cheat VerifyVersionInfo(...) */
if (VerifyVersionInfo(
&info,
VER_MAJORVERSION|VER_MINORVERSION|VER_BUILDNUMBER,
dwlConditionMask)) {
break;
}
else {
if (PyDict_GetItemString(
dict,
win_runtime_flags[i].flag_name) != NULL) {
PyDict_DelItemString(
dict,
win_runtime_flags[i].flag_name);
}
}
}
}
#endif
#include <stddef.h>
@ -7890,5 +7954,11 @@ PyInit__socket(void)
#if defined(USE_GETHOSTBYNAME_LOCK) || defined(USE_GETADDRINFO_LOCK)
netdb_lock = PyThread_allocate_lock();
#endif
#ifdef MS_WINDOWS
/* remove some flags on older version Windows during run-time */
remove_unusable_flags(m);
#endif
return m;
}