1 files changed, 396 insertions, 0 deletions
diff --git a/src/bacon-message-connection.c b/src/bacon-message-connection.c
new file mode 100644
index 0000000..c8000de
--- /dev/null
+++ b/src/bacon-message-connection.c
@@ -0,0 +1,396 @@
+/*
+ * Copyright (C) 2003 Bastien Nocera <[email protected]>
+ *
+ * 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.
+ *
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <errno.h>
+
+#include "bacon-message-connection.h"
+
+#ifndef UNIX_PATH_MAX
+#define UNIX_PATH_MAX 108
+#endif
+
+struct BaconMessageConnection {
+ /* A server accepts connections */
+ gboolean is_server;
+
+ /* The socket path itself */
+ char *path;
+
+ /* File descriptor of the socket */
+ int fd;
+ /* Channel to watch */
+ GIOChannel *chan;
+ /* Event id returned by g_io_add_watch() */
+ int conn_id;
+
+ /* Connections accepted by this connection */
+ GSList *accepted_connections;
+
+ /* callback */
+ void (*func) (const char *message, gpointer user_data);
+ gpointer data;
+};
+
+static gboolean
+test_is_socket (const char *path)
+{
+ struct stat s;
+
+ if (stat (path, &s) == -1)
+ return FALSE;
+
+ if (S_ISSOCK (s.st_mode))
+ return TRUE;
+
+ return FALSE;
+}
+
+static gboolean
+is_owned_by_user_and_socket (const char *path)
+{
+ struct stat s;
+
+ if (stat (path, &s) == -1)
+ return FALSE;
+
+ if (s.st_uid != geteuid ())
+ return FALSE;
+
+ if ((s.st_mode & S_IFSOCK) != S_IFSOCK)
+ return FALSE;
+ 
+ return TRUE;
+}
+
+static gboolean server_cb (GIOChannel *source,
+ GIOCondition condition, gpointer data);
+
+static gboolean
+setup_connection (BaconMessageConnection *conn)
+{
+ g_return_val_if_fail (conn->chan == NULL, FALSE);
+
+ conn->chan = g_io_channel_unix_new (conn->fd);
+ if (!conn->chan) {
+ return FALSE;
+ }
+ g_io_channel_set_line_term (conn->chan, "\n", 1);
+ conn->conn_id = g_io_add_watch (conn->chan, G_IO_IN, server_cb, conn);
+
+ return TRUE;
+}
+
+static void
+accept_new_connection (BaconMessageConnection *server_conn)
+{
+ BaconMessageConnection *conn;
+ int alen;
+
+ g_return_if_fail (server_conn->is_server);
+
+ conn = g_new0 (BaconMessageConnection, 1);
+ conn->is_server = FALSE;
+ conn->func = server_conn->func;
+ conn->data = server_conn->data;
+
+ conn->fd = accept (server_conn->fd, NULL, (guint *)&alen);
+
+ server_conn->accepted_connections =
+ g_slist_prepend (server_conn->accepted_connections, conn);
+
+ setup_connection (conn);
+}
+
+static gboolean
+server_cb (GIOChannel *source, GIOCondition condition, gpointer data)
+{
+ BaconMessageConnection *conn = (BaconMessageConnection *)data;
+ char *message, *subs, buf;
+ int cd, rc, offset;
+ gboolean finished;
+
+ offset = 0;
+ if (conn->is_server && conn->fd == g_io_channel_unix_get_fd (source)) {
+ accept_new_connection (conn);
+ return TRUE;
+ }
+ message = g_malloc (1);
+ cd = conn->fd;
+ rc = read (cd, &buf, 1);
+ while (rc > 0 && buf != '\n')
+ {
+ message = g_realloc (message, rc + offset + 1);
+ message[offset] = buf;
+ offset = offset + rc;
+ rc = read (cd, &buf, 1);
+ }
+ if (rc <= 0) {
+ g_io_channel_shutdown (conn->chan, FALSE, NULL);
+ g_io_channel_unref (conn->chan);
+ conn->chan = NULL;
+ close (conn->fd);
+ conn->fd = -1;
+ g_free (message);
+ conn->conn_id = 0;
+
+ return FALSE;
+ }
+ message[offset] = '\0';
+
+ subs = message;
+ finished = FALSE;
+
+ while (finished == FALSE && *subs != '\0')
+ {
+ if (conn->func != NULL)
+ (*conn->func) (subs, conn->data);
+
+ subs += strlen (subs) + 1;
+ if (subs - message >= offset)
+ finished = TRUE;
+ }
+
+ g_free (message);
+
+ return TRUE;
+}
+
+static char *
+find_file_with_pattern (const char *dir, const char *pattern)
+{
+ GDir *filedir;
+ char *found_filename;
+ const char *filename;
+ GPatternSpec *pat;
+
+ filedir = g_dir_open (dir, 0, NULL);
+ if (filedir == NULL)
+ return NULL;
+
+ pat = g_pattern_spec_new (pattern);
+ if (pat == NULL)
+ {
+ g_dir_close (filedir);
+ return NULL;
+ }
+
+ found_filename = NULL;
+
+ while ((filename = g_dir_read_name (filedir)))
+ {
+ if (g_pattern_match_string (pat, filename))
+ {
+ char *tmp = g_build_filename (dir, filename, NULL);
+ if (is_owned_by_user_and_socket (tmp))
+ found_filename = g_strdup (filename);
+ g_free (tmp);
+ }
+
+ if (found_filename != NULL)
+ break;
+ }
+
+ g_pattern_spec_free (pat);
+ g_dir_close (filedir);
+
+ return found_filename;
+}
+
+static char *
+socket_filename (const char *prefix)
+{
+ char *pattern, *newfile, *path, *filename;
+ const char *tmpdir;
+
+ pattern = g_strdup_printf ("%s.%s.*", prefix, g_get_user_name ());
+ tmpdir = g_get_tmp_dir ();
+ filename = find_file_with_pattern (tmpdir, pattern);
+ if (filename == NULL)
+ {
+ newfile = g_strdup_printf ("%s.%s.%u", prefix,
+ g_get_user_name (), g_random_int ());
+ path = g_build_filename (tmpdir, newfile, NULL);
+ g_free (newfile);
+ } else {
+ path = g_build_filename (tmpdir, filename, NULL);
+ g_free (filename);
+ }
+
+ g_free (pattern);
+ return path;
+}
+
+static gboolean
+try_server (BaconMessageConnection *conn)
+{
+ struct sockaddr_un uaddr;
+
+ uaddr.sun_family = AF_UNIX;
+ strncpy (uaddr.sun_path, conn->path,
+ MIN (strlen(conn->path)+1, UNIX_PATH_MAX));
+ conn->fd = socket (PF_UNIX, SOCK_STREAM, 0);
+ if (bind (conn->fd, (struct sockaddr *) &uaddr, sizeof (uaddr)) == -1)
+ {
+ conn->fd = -1;
+ return FALSE;
+ }
+ listen (conn->fd, 5);
+
+ if (!setup_connection (conn))
+ return FALSE;
+ return TRUE;
+}
+
+static gboolean
+try_client (BaconMessageConnection *conn)
+{
+ struct sockaddr_un uaddr;
+
+ uaddr.sun_family = AF_UNIX;
+ strncpy (uaddr.sun_path, conn->path,
+ MIN(strlen(conn->path)+1, UNIX_PATH_MAX));
+ conn->fd = socket (PF_UNIX, SOCK_STREAM, 0);
+ if (connect (conn->fd, (struct sockaddr *) &uaddr,
+ sizeof (uaddr)) == -1)
+ {
+ conn->fd = -1;
+ return FALSE;
+ }
+
+ return setup_connection (conn);
+}
+
+BaconMessageConnection *
+bacon_message_connection_new (const char *prefix)
+{
+ BaconMessageConnection *conn;
+
+ g_return_val_if_fail (prefix != NULL, NULL);
+
+ conn = g_new0 (BaconMessageConnection, 1);
+ conn->path = socket_filename (prefix);
+
+ if (test_is_socket (conn->path) == FALSE)
+ {
+ if (!try_server (conn))
+ {
+ bacon_message_connection_free (conn);
+ return NULL;
+ }
+
+ conn->is_server = TRUE;
+ return conn;
+ }
+
+ if (try_client (conn) == FALSE)
+ {
+ unlink (conn->path);
+ try_server (conn);
+ if (conn->fd == -1)
+ {
+ bacon_message_connection_free (conn);
+ return NULL;
+ }
+
+ conn->is_server = TRUE;
+ return conn;
+ }
+
+ conn->is_server = FALSE;
+ return conn;
+}
+
+void
+bacon_message_connection_free (BaconMessageConnection *conn)
+{
+ GSList *child_conn;
+
+ g_return_if_fail (conn != NULL);
+ /* Only servers can accept other connections */
+ g_return_if_fail (conn->is_server != FALSE ||
+ conn->accepted_connections == NULL);
+
+ child_conn = conn->accepted_connections;
+ while (child_conn != NULL) {
+ bacon_message_connection_free (child_conn->data);
+ child_conn = g_slist_next (child_conn);
+ }
+ g_slist_free (conn->accepted_connections);
+
+ if (conn->conn_id) {
+ g_source_remove (conn->conn_id);
+ conn->conn_id = 0;
+ }
+ if (conn->chan) {
+ g_io_channel_shutdown (conn->chan, FALSE, NULL);
+ g_io_channel_unref (conn->chan);
+ }
+
+ if (conn->is_server != FALSE) {
+ unlink (conn->path);
+ }
+ if (conn->fd != -1) {
+ close (conn->fd);
+ }
+
+ g_free (conn->path);
+ g_free (conn);
+}
+
+void
+bacon_message_connection_set_callback (BaconMessageConnection *conn,
+ BaconMessageReceivedFunc func,
+ gpointer user_data)
+{
+ g_return_if_fail (conn != NULL);
+
+ conn->func = func;
+ conn->data = user_data;
+}
+
+void
+bacon_message_connection_send (BaconMessageConnection *conn,
+ const char *message)
+{
+ g_return_if_fail (conn != NULL);
+ g_return_if_fail (message != NULL);
+
+ g_io_channel_write_chars (conn->chan, message, strlen (message),
+ NULL, NULL);
+ g_io_channel_write_chars (conn->chan, "\n", 1, NULL, NULL);
+ g_io_channel_flush (conn->chan, NULL);
+}
+
+gboolean
+bacon_message_connection_get_is_server (BaconMessageConnection *conn)
+{
+ g_return_val_if_fail (conn != NULL, FALSE);
+
+ return conn->is_server;
+}
+