add UsbManager

1 files changed, 109 insertions, 0 deletions

diff --git a/src/usb-manager.cpp b/src/usb-manager.cpp
new file mode 100644
index 0000000..6b40cea
--- /dev/null
+++ b/src/usb-manager.cpp
@@ -0,0 +1,109 @@
+/*
+ * Copyright 2016 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *   Charles Kerr <charles.kerr@canonical.com>
+ */
+
+#include <src/adbd-client.h>
+#include <src/usb-manager.h>
+#include <src/usb-snap.h>
+
+#include <glib.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+class UsbManager::Impl
+{
+public:
+ 
+    explicit Impl(
+        const std::string& socket_path,
+        const std::string& public_keys_filename
+    ):
+        m_adbd_client{std::make_shared<GAdbdClient>(socket_path)},
+        m_public_keys_filename{public_keys_filename}
+    {
+        m_adbd_client->on_pk_request().connect([this](const AdbdClient::PKRequest& req){
+            auto snap = new UsbSnap(req.fingerprint);
+            snap->on_user_response().connect([this,req,snap](AdbdClient::PKResponse response, bool /*FIXME: remember_choice*/){
+                req.respond(response);
+                if (response == AdbdClient::PKResponse::ALLOW)
+                    write_public_key(req.public_key);
+
+                // delete later
+                g_idle_add([](gpointer gsnap){delete static_cast<UsbSnap*>(gsnap); return G_SOURCE_REMOVE;}, snap);
+            });
+        });
+    }
+
+    ~Impl()
+    {
+    }
+
+private:
+
+    void write_public_key(const std::string& public_key)
+    {
+        // confirm the directory exists
+        auto dirname = g_path_get_dirname(m_public_keys_filename.c_str());
+        const auto dir_exists = g_file_test(dirname, G_FILE_TEST_IS_DIR);
+        if (!dir_exists)
+            g_warning("ADB data directory '%s' does not exist", dirname);
+        g_clear_pointer(&dirname, g_free);
+        if (!dir_exists)
+            return;
+
+        // open the file in append mode, with user rw and group r permissions
+        const auto fd = open(
+            m_public_keys_filename.c_str(),
+            O_APPEND|O_CREAT|O_WRONLY,
+            S_IRUSR|S_IWUSR|S_IRGRP
+        );
+        if (fd == -1) {
+            g_warning("Error opening ADB datafile: %s", g_strerror(errno));
+            return;
+        }
+
+        // write the new public key on its own line
+        std::string buf {public_key + '\n'};
+        if (write(fd, buf.c_str(), buf.size()) == -1)
+            g_warning("Error writing ADB datafile: %d %s", errno, g_strerror(errno));
+        close(fd);
+    }
+
+    std::shared_ptr<GAdbdClient> m_adbd_client;
+    const std::string m_public_keys_filename;
+};
+
+/***
+****
+***/
+
+UsbManager::UsbManager(
+    const std::string& socket_path,
+    const std::string& public_keys_filename
+):
+    impl{new Impl{socket_path, public_keys_filename}}
+{
+}
+
+UsbManager::~UsbManager()
+{
+}
+