extcap: move windows functions into extcap-base

Change-Id: Iec7fed027a24992afd673b09c32470af51739ae5
Reviewed-on: https://code.wireshark.org/review/14075
Reviewed-by: Roland Knall <rknall@gmail.com>

1 files changed, 85 insertions, 0 deletions

diff --git a/extcap/extcap-base.c b/extcap/extcap-base.c
new file mode 100644
index 0000000000..51d2061469
--- /dev/null
+++ b/extcap/extcap-base.c
@@ -0,0 +1,85 @@
+/* extcap_base.c
+ * Base function for extcaps
+ *
+ * Copyright 2015, Dario Lombardo
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "extcap-base.h"
+
+#ifdef _WIN32
+BOOLEAN IsHandleRedirected(DWORD handle)
+{
+	HANDLE h = GetStdHandle(handle);
+	if (h) {
+		BY_HANDLE_FILE_INFORMATION fi;
+		if (GetFileInformationByHandle(h, &fi)) {
+			return TRUE;
+		}
+	}
+	return FALSE;
+}
+
+void attach_parent_console()
+{
+	BOOL outRedirected, errRedirected;
+
+	outRedirected = IsHandleRedirected(STD_OUTPUT_HANDLE);
+	errRedirected = IsHandleRedirected(STD_ERROR_HANDLE);
+
+	if (outRedirected && errRedirected) {
+		/* Both standard output and error handles are redirected.
+		 * There is no point in attaching to parent process console.
+		 */
+		return;
+	}
+
+	if (AttachConsole(ATTACH_PARENT_PROCESS) == 0) {
+		/* Console attach failed. */
+		return;
+	}
+
+	/* Console attach succeeded */
+	if (outRedirected == FALSE) {
+		if (!freopen("CONOUT$", "w", stdout)) {
+			errmsg_print("WARNING: Cannot redirect to stdout.");
+		}
+	}
+
+	if (errRedirected == FALSE) {
+		if (!freopen("CONOUT$", "w", stderr)) {
+			errmsg_print("WARNING: Cannot redirect to strerr.");
+		}
+	}
+}
+#endif
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: t
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=4 noexpandtab:
+ * :indentSize=4:tabSize=4:noTabs=false:
+ */