From 6be86147f292b3178413bc644853ad80b620042e Mon Sep 17 00:00:00 2001
From: marha <marha@users.sourceforge.net>
Date: Fri, 19 Nov 2010 12:14:18 +0000
Subject: Reintegrate tools from trunk

---
 tools/plink/winpgntc.c | 138 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 tools/plink/winpgntc.c

(limited to 'tools/plink/winpgntc.c')

diff --git a/tools/plink/winpgntc.c b/tools/plink/winpgntc.c
new file mode 100644
index 000000000..3bfafc972
--- /dev/null
+++ b/tools/plink/winpgntc.c
@@ -0,0 +1,138 @@
+/*
+ * Pageant client code.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "putty.h"
+
+#define AGENT_COPYDATA_ID 0x804e50ba   /* random goop */
+#define AGENT_MAX_MSGLEN  8192
+
+int agent_exists(void)
+{
+    HWND hwnd;
+    hwnd = FindWindow("Pageant", "Pageant");
+    if (!hwnd)
+	return FALSE;
+    else
+	return TRUE;
+}
+
+/*
+ * Unfortunately, this asynchronous agent request mechanism doesn't
+ * appear to work terribly well. I'm going to comment it out for
+ * the moment, and see if I can come up with a better one :-/
+ */
+#ifdef WINDOWS_ASYNC_AGENT
+
+struct agent_query_data {
+    COPYDATASTRUCT cds;
+    unsigned char *mapping;
+    HANDLE handle;
+    char *mapname;
+    HWND hwnd;
+    void (*callback)(void *, void *, int);
+    void *callback_ctx;
+};
+
+DWORD WINAPI agent_query_thread(LPVOID param)
+{
+    struct agent_query_data *data = (struct agent_query_data *)param;
+    unsigned char *ret;
+    int id, retlen;
+
+    id = SendMessage(data->hwnd, WM_COPYDATA, (WPARAM) NULL,
+		     (LPARAM) &data->cds);
+    ret = NULL;
+    if (id > 0) {
+	retlen = 4 + GET_32BIT(data->mapping);
+	ret = snewn(retlen, unsigned char);
+	if (ret) {
+	    memcpy(ret, data->mapping, retlen);
+	}
+    }
+    if (!ret)
+	retlen = 0;
+    UnmapViewOfFile(data->mapping);
+    CloseHandle(data->handle);
+    sfree(data->mapname);
+
+    agent_schedule_callback(data->callback, data->callback_ctx, ret, retlen);
+
+    return 0;
+}
+
+#endif
+
+int agent_query(void *in, int inlen, void **out, int *outlen,
+		void (*callback)(void *, void *, int), void *callback_ctx)
+{
+    HWND hwnd;
+    char *mapname;
+    HANDLE filemap;
+    unsigned char *p, *ret;
+    int id, retlen;
+    COPYDATASTRUCT cds;
+
+    *out = NULL;
+    *outlen = 0;
+
+    hwnd = FindWindow("Pageant", "Pageant");
+    if (!hwnd)
+	return 1;		       /* *out == NULL, so failure */
+    mapname = dupprintf("PageantRequest%08x", (unsigned)GetCurrentThreadId());
+    filemap = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE,
+				0, AGENT_MAX_MSGLEN, mapname);
+    if (filemap == NULL || filemap == INVALID_HANDLE_VALUE)
+	return 1;		       /* *out == NULL, so failure */
+    p = MapViewOfFile(filemap, FILE_MAP_WRITE, 0, 0, 0);
+    memcpy(p, in, inlen);
+    cds.dwData = AGENT_COPYDATA_ID;
+    cds.cbData = 1 + strlen(mapname);
+    cds.lpData = mapname;
+#ifdef WINDOWS_ASYNC_AGENT
+    if (callback != NULL && !(flags & FLAG_SYNCAGENT)) {
+	/*
+	 * We need an asynchronous Pageant request. Since I know of
+	 * no way to stop SendMessage from blocking the thread it's
+	 * called in, I see no option but to start a fresh thread.
+	 * When we're done we'll PostMessage the result back to our
+	 * main window, so that the callback is done in the primary
+	 * thread to avoid concurrency.
+	 */
+	struct agent_query_data *data = snew(struct agent_query_data);
+	DWORD threadid;
+	data->mapping = p;
+	data->handle = filemap;
+	data->mapname = mapname;
+	data->callback = callback;
+	data->callback_ctx = callback_ctx;
+	data->cds = cds;	       /* structure copy */
+	data->hwnd = hwnd;
+	if (CreateThread(NULL, 0, agent_query_thread, data, 0, &threadid))
+	    return 0;
+	sfree(data);
+    }
+#endif
+
+    /*
+     * The user either passed a null callback (indicating that the
+     * query is required to be synchronous) or CreateThread failed.
+     * Either way, we need a synchronous request.
+     */
+    id = SendMessage(hwnd, WM_COPYDATA, (WPARAM) NULL, (LPARAM) &cds);
+    if (id > 0) {
+	retlen = 4 + GET_32BIT(p);
+	ret = snewn(retlen, unsigned char);
+	if (ret) {
+	    memcpy(ret, p, retlen);
+	    *out = ret;
+	    *outlen = retlen;
+	}
+    }
+    UnmapViewOfFile(p);
+    CloseHandle(filemap);
+    return 1;
+}
-- 
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