/*
* Copyright (C) 2003 Bastien Nocera <hadess@hadess.net>
*
* 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.
*
* The Totem project hereby grant permission for non-gpl compatible GStreamer
* plugins to be used and distributed together with GStreamer and Totem. This
* permission are above and beyond the permissions granted by the GPL license
* Totem is covered by.
*
* Monday 7th February 2005: Christian Schaller: Add excemption clause.
* See license_change file for details.
*
*/
#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)
{
int fdflags;
g_return_val_if_fail (conn->chan == NULL, FALSE);
/* Add CLOEXEC flag on the fd to make sure the socket get closed
* if exec is called. */
fdflags = fcntl (conn->fd, F_GETFD, 0);
if (fdflags >= 0) {
fdflags |= FD_CLOEXEC;
fcntl (conn->fd, F_SETFD, fdflags);
}
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);
return setup_connection (conn);
}
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;
}
