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-rw-r--r--src/ka-entry-buffer.c229
1 files changed, 229 insertions, 0 deletions
diff --git a/src/ka-entry-buffer.c b/src/ka-entry-buffer.c
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+/* Krb5 Auth Applet -- Acquire and release kerberos tickets
+ *
+ * (C) 2010 Guido Guenther <agx@sigxcpu.org>
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+/* Create an entry buffer that uses the secmem routines for password storage */
+
+#include "config.h"
+
+#include <gtk/gtk.h>
+#include <string.h>
+
+#include "ka-entry-buffer.h"
+#include "memory.h"
+
+struct _KaEntryBuffer {
+ GtkEntryBuffer parent;
+
+ KaEntryBufferPrivate *priv;
+};
+
+struct _KaEntryBufferClass {
+ GtkEntryBufferClass parent_class;
+};
+
+G_DEFINE_TYPE (KaEntryBuffer, ka_entry_buffer, GTK_TYPE_ENTRY_BUFFER)
+
+struct _KaEntryBufferPrivate {
+ gchar *password;
+ gsize password_size;
+ gsize password_bytes;
+ guint password_chars;
+};
+
+
+static const gchar *
+ka_entry_buffer_pw_get_text (GtkEntryBuffer *buffer,
+ gsize * n_bytes)
+{
+ KaEntryBuffer *self = KA_ENTRY_BUFFER(buffer);
+
+ if (n_bytes)
+ *n_bytes = self->priv->password_bytes;
+ if (!self->priv->password)
+ return "";
+ return self->priv->password;
+}
+
+
+static guint
+ka_entry_buffer_pw_get_length (GtkEntryBuffer *buffer)
+{
+ KaEntryBuffer *self = KA_ENTRY_BUFFER(buffer);
+ return self->priv->password_chars;
+}
+
+
+static guint
+ka_entry_buffer_pw_insert_text (GtkEntryBuffer *buffer,
+ guint position,
+ const gchar *chars,
+ guint n_chars)
+{
+ KaEntryBuffer *self = KA_ENTRY_BUFFER(buffer);
+ KaEntryBufferPrivate *pv = self->priv;
+ gsize prev_size;
+ gsize n_bytes;
+ gsize at;
+
+ n_bytes = g_utf8_offset_to_pointer (chars, n_chars) - chars;
+
+ /* Need more memory */
+ if (n_bytes + pv->password_bytes + 1 > pv->password_size) {
+ gchar *et_new;
+
+ prev_size = pv->password_size;
+
+ /* Calculate our new buffer size */
+ while (n_bytes + pv->password_bytes + 1 > pv->password_size) {
+ if (pv->password_size == 0)
+ pv->password_size = PW_MIN_SIZE;
+ else {
+ if (2 * pv->password_size < GTK_ENTRY_BUFFER_MAX_SIZE)
+ pv->password_size *= 2;
+ else {
+ pv->password_size = GTK_ENTRY_BUFFER_MAX_SIZE;
+ if (n_bytes >
+ pv->password_size - pv->password_bytes - 1) {
+ n_bytes =
+ pv->password_size - pv->password_bytes - 1;
+ n_bytes =
+ g_utf8_find_prev_char (chars,
+ chars + n_bytes + 1) -
+ chars;
+ n_chars = g_utf8_strlen (chars, n_bytes);
+ }
+ break;
+ }
+ }
+ }
+
+ et_new = secmem_malloc (pv->password_size);
+ memcpy (et_new, pv->password,
+ MIN (prev_size, pv->password_size));
+ secmem_free (pv->password);
+ pv->password = et_new;
+ }
+
+ /* Actual text insertion */
+ at = g_utf8_offset_to_pointer (pv->password,
+ position) - pv->password;
+ g_memmove (pv->password + at + n_bytes, pv->password + at,
+ pv->password_bytes - at);
+ memcpy (pv->password + at, chars, n_bytes);
+
+ /* Book keeping */
+ pv->password_bytes += n_bytes;
+ pv->password_chars += n_chars;
+ pv->password[pv->password_bytes] = '\0';
+
+ gtk_entry_buffer_emit_inserted_text (GTK_ENTRY_BUFFER(self), position, chars, n_chars);
+ return n_chars;
+}
+
+
+static guint
+ka_entry_buffer_pw_delete_text (GtkEntryBuffer *buffer,
+ guint position, guint n_chars)
+{
+ KaEntryBuffer *self = KA_ENTRY_BUFFER(buffer);
+ KaEntryBufferPrivate *pv = self->priv;
+ gsize start, end;
+
+ if (position > pv->password_chars)
+ position = pv->password_chars;
+ if (position + n_chars > pv->password_chars)
+ n_chars = pv->password_chars - position;
+
+ if (n_chars > 0) {
+ start =
+ g_utf8_offset_to_pointer (pv->password,
+ position) - pv->password;
+ end =
+ g_utf8_offset_to_pointer (pv->password,
+ position + n_chars) - pv->password;
+
+ g_memmove (pv->password + start, pv->password + end,
+ pv->password_bytes + 1 - end);
+ pv->password_chars -= n_chars;
+ pv->password_bytes -= (end - start);
+ gtk_entry_buffer_emit_deleted_text (GTK_ENTRY_BUFFER(self), position, n_chars);
+ }
+ return n_chars;
+}
+
+
+static void
+ka_entry_buffer_dispose (GObject *object)
+{
+ G_OBJECT_CLASS (ka_entry_buffer_parent_class)->dispose (object);
+}
+
+static void
+ka_entry_buffer_finalize (GObject *object)
+{
+ KaEntryBuffer *self = KA_ENTRY_BUFFER(object);
+
+ if (self->priv->password) {
+ secmem_free (self->priv->password);
+ self->priv->password_size = 0;
+ self->priv->password_bytes = 0;
+ self->priv->password_chars = 0;
+ }
+ G_OBJECT_CLASS (ka_entry_buffer_parent_class)->finalize (object);
+}
+
+static void
+ka_entry_buffer_class_init (KaEntryBufferClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GtkEntryBufferClass *eb_class = GTK_ENTRY_BUFFER_CLASS (klass);
+
+ g_type_class_add_private (klass, sizeof (KaEntryBufferPrivate));
+
+ eb_class->get_text = ka_entry_buffer_pw_get_text;
+ eb_class->get_length = ka_entry_buffer_pw_get_length;
+ eb_class->insert_text = ka_entry_buffer_pw_insert_text;
+ eb_class->delete_text = ka_entry_buffer_pw_delete_text;
+
+ object_class->dispose = ka_entry_buffer_dispose;
+ object_class->finalize = ka_entry_buffer_finalize;
+}
+
+static void
+ka_entry_buffer_init (KaEntryBuffer *self)
+{
+ self->priv = G_TYPE_INSTANCE_GET_PRIVATE(self,
+ KA_TYPE_ENTRY_BUFFER,
+ KaEntryBufferPrivate);
+ self->priv->password = NULL;
+ self->priv->password_size = 0;
+ self->priv->password_bytes = 0;
+ self->priv->password_chars = 0;
+}
+
+KaEntryBuffer *
+ka_entry_buffer_new (void)
+{
+ return g_object_new (KA_TYPE_ENTRY_BUFFER, NULL);
+}
+
+/*
+ * vim:ts:sts=4:sw=4:et:
+ */
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