diff options
Diffstat (limited to 'tools/plink/winpgntc.c')
| -rw-r--r-- | tools/plink/winpgntc.c | 138 |
1 files changed, 138 insertions, 0 deletions
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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