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[Openvpn-devel,S] Change in openvpn[release/2.6]: dco-win: get driver version

Message ID 08742e2cb71d65503bd24b8878488e3ae35e8d79-HTML@gerrit.openvpn.net
State Superseded
Headers show
Series [Openvpn-devel,S] Change in openvpn[release/2.6]: dco-win: get driver version | expand

Commit Message

flichtenheld (Code Review) Oct. 7, 2023, 11:30 a.m. UTC 
Attention is currently required from: flichtenheld.

Hello flichtenheld,

I'd like you to do a code review.
Please visit

    http://gerrit.openvpn.net/c/openvpn/+/367?usp=email

to review the following change.


Change subject: dco-win: get driver version
......................................................................

dco-win: get driver version

Print dco-win driver version using the new ioctl.
Requires dco-win driver 1.0.0 or newer to work.

Change-Id: I1d0d909e7fca3f51b5c848f1a771a989ab040f17
Signed-off-by: Lev Stipakov <lev@openvpn.net>
---
M src/openvpn/dco_win.c
M src/openvpn/ovpn_dco_win.h
2 files changed, 33 insertions(+), 1 deletion(-)



  git pull ssh://gerrit.openvpn.net:29418/openvpn refs/changes/67/367/1
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Patch

diff --git a/src/openvpn/dco_win.c b/src/openvpn/dco_win.c
index 53f1523..75daae2 100644
--- a/src/openvpn/dco_win.c
+++ b/src/openvpn/dco_win.c
@@ -386,7 +386,32 @@ 
 const char *
 dco_version_string(struct gc_arena *gc)
 {
-    return "v0";
+    OVPN_VERSION version;
+    ZeroMemory(&version, sizeof(OVPN_VERSION));
+
+    /* try to open device by symbolic name */
+    HANDLE h = CreateFile("\\\\.\\ovpn-dco", GENERIC_READ | GENERIC_WRITE,
+        0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, NULL);
+
+    if (h == INVALID_HANDLE_VALUE)
+    {
+        return "N/A";
+    }
+
+    DWORD bytes_returned = 0;
+    if (!DeviceIoControl(h, OVPN_IOCTL_GET_VERSION, NULL, 0,
+        &version, sizeof(version), &bytes_returned, NULL))
+    {
+        CloseHandle(h);
+        return "N/A";
+    }
+
+    CloseHandle(h);
+
+    struct buffer out = alloc_buf_gc(256, gc);
+    buf_printf(&out, "%d.%d.%d", version.Major, version.Minor, version.Patch);
+
+    return BSTR(&out);
 }
 
 int
diff --git a/src/openvpn/ovpn_dco_win.h b/src/openvpn/ovpn_dco_win.h
index cbbdf92..ea2a733 100644
--- a/src/openvpn/ovpn_dco_win.h
+++ b/src/openvpn/ovpn_dco_win.h
@@ -100,6 +100,12 @@ 
 	LONG MSS;
 } OVPN_SET_PEER, * POVPN_SET_PEER;
 
+typedef struct _OVPN_VERSION {
+    LONG Major;
+    LONG Minor;
+    LONG Patch;
+} OVPN_VERSION, * POVPN_VERSION;
+
 #define OVPN_IOCTL_NEW_PEER     CTL_CODE(FILE_DEVICE_UNKNOWN, 1, METHOD_BUFFERED, FILE_ANY_ACCESS)
 #define OVPN_IOCTL_GET_STATS    CTL_CODE(FILE_DEVICE_UNKNOWN, 2, METHOD_BUFFERED, FILE_ANY_ACCESS)
 #define OVPN_IOCTL_NEW_KEY      CTL_CODE(FILE_DEVICE_UNKNOWN, 3, METHOD_BUFFERED, FILE_ANY_ACCESS)
@@ -107,3 +113,4 @@ 
 #define OVPN_IOCTL_SET_PEER     CTL_CODE(FILE_DEVICE_UNKNOWN, 5, METHOD_BUFFERED, FILE_ANY_ACCESS)
 #define OVPN_IOCTL_START_VPN    CTL_CODE(FILE_DEVICE_UNKNOWN, 6, METHOD_BUFFERED, FILE_ANY_ACCESS)
 #define OVPN_IOCTL_DEL_PEER     CTL_CODE(FILE_DEVICE_UNKNOWN, 7, METHOD_BUFFERED, FILE_ANY_ACCESS)
+#define OVPN_IOCTL_GET_VERSION  CTL_CODE(FILE_DEVICE_UNKNOWN, 8, METHOD_BUFFERED, FILE_ANY_ACCESS)