397 lines
8.2 KiB
C
397 lines
8.2 KiB
C
/*
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* Copyright (C) 2003 Bastien Nocera <hadess@hadess.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <errno.h>
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#include "bacon-message-connection.h"
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#ifndef UNIX_PATH_MAX
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#define UNIX_PATH_MAX 108
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#endif
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struct BaconMessageConnection {
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/* A server accepts connections */
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gboolean is_server;
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/* The socket path itself */
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char *path;
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/* File descriptor of the socket */
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int fd;
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/* Channel to watch */
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GIOChannel *chan;
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/* Event id returned by g_io_add_watch() */
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int conn_id;
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/* Connections accepted by this connection */
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GSList *accepted_connections;
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/* callback */
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void (*func) (const char *message, gpointer user_data);
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gpointer data;
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};
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static gboolean
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test_is_socket (const char *path)
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{
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struct stat s;
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if (stat (path, &s) == -1)
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return FALSE;
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if (S_ISSOCK (s.st_mode))
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return TRUE;
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return FALSE;
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}
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static gboolean
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is_owned_by_user_and_socket (const char *path)
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{
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struct stat s;
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if (stat (path, &s) == -1)
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return FALSE;
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if (s.st_uid != geteuid ())
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return FALSE;
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if ((s.st_mode & S_IFSOCK) != S_IFSOCK)
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return FALSE;
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return TRUE;
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}
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static gboolean server_cb (GIOChannel *source,
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GIOCondition condition, gpointer data);
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static gboolean
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setup_connection (BaconMessageConnection *conn)
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{
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g_return_val_if_fail (conn->chan == NULL, FALSE);
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conn->chan = g_io_channel_unix_new (conn->fd);
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if (!conn->chan) {
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return FALSE;
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}
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g_io_channel_set_line_term (conn->chan, "\n", 1);
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conn->conn_id = g_io_add_watch (conn->chan, G_IO_IN, server_cb, conn);
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return TRUE;
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}
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static void
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accept_new_connection (BaconMessageConnection *server_conn)
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{
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BaconMessageConnection *conn;
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int alen;
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g_return_if_fail (server_conn->is_server);
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conn = g_new0 (BaconMessageConnection, 1);
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conn->is_server = FALSE;
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conn->func = server_conn->func;
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conn->data = server_conn->data;
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conn->fd = accept (server_conn->fd, NULL, (guint *)&alen);
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server_conn->accepted_connections =
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g_slist_prepend (server_conn->accepted_connections, conn);
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setup_connection (conn);
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}
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static gboolean
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server_cb (GIOChannel *source, GIOCondition condition, gpointer data)
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{
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BaconMessageConnection *conn = (BaconMessageConnection *)data;
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char *message, *subs, buf;
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int cd, rc, offset;
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gboolean finished;
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offset = 0;
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if (conn->is_server && conn->fd == g_io_channel_unix_get_fd (source)) {
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accept_new_connection (conn);
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return TRUE;
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}
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message = g_malloc (1);
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cd = conn->fd;
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rc = read (cd, &buf, 1);
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while (rc > 0 && buf != '\n')
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{
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message = g_realloc (message, rc + offset + 1);
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message[offset] = buf;
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offset = offset + rc;
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rc = read (cd, &buf, 1);
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}
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if (rc <= 0) {
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g_io_channel_shutdown (conn->chan, FALSE, NULL);
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g_io_channel_unref (conn->chan);
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conn->chan = NULL;
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close (conn->fd);
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conn->fd = -1;
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g_free (message);
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conn->conn_id = 0;
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return FALSE;
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}
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message[offset] = '\0';
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subs = message;
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finished = FALSE;
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while (finished == FALSE && *subs != '\0')
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{
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if (conn->func != NULL)
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(*conn->func) (subs, conn->data);
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subs += strlen (subs) + 1;
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if (subs - message >= offset)
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finished = TRUE;
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}
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g_free (message);
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return TRUE;
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}
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static char *
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find_file_with_pattern (const char *dir, const char *pattern)
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{
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GDir *filedir;
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char *found_filename;
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const char *filename;
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GPatternSpec *pat;
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filedir = g_dir_open (dir, 0, NULL);
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if (filedir == NULL)
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return NULL;
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pat = g_pattern_spec_new (pattern);
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if (pat == NULL)
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{
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g_dir_close (filedir);
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return NULL;
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}
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found_filename = NULL;
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while ((filename = g_dir_read_name (filedir)))
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{
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if (g_pattern_match_string (pat, filename))
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{
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char *tmp = g_build_filename (dir, filename, NULL);
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if (is_owned_by_user_and_socket (tmp))
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found_filename = g_strdup (filename);
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g_free (tmp);
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}
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if (found_filename != NULL)
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break;
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}
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g_pattern_spec_free (pat);
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g_dir_close (filedir);
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return found_filename;
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}
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static char *
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socket_filename (const char *prefix)
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{
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char *pattern, *newfile, *path, *filename;
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const char *tmpdir;
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pattern = g_strdup_printf ("%s.%s.*", prefix, g_get_user_name ());
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tmpdir = g_get_tmp_dir ();
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filename = find_file_with_pattern (tmpdir, pattern);
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if (filename == NULL)
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{
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newfile = g_strdup_printf ("%s.%s.%u", prefix,
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g_get_user_name (), g_random_int ());
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path = g_build_filename (tmpdir, newfile, NULL);
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g_free (newfile);
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} else {
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path = g_build_filename (tmpdir, filename, NULL);
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g_free (filename);
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}
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g_free (pattern);
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return path;
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}
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static gboolean
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try_server (BaconMessageConnection *conn)
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{
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struct sockaddr_un uaddr;
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uaddr.sun_family = AF_UNIX;
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strncpy (uaddr.sun_path, conn->path,
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MIN (strlen(conn->path)+1, UNIX_PATH_MAX));
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conn->fd = socket (PF_UNIX, SOCK_STREAM, 0);
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if (bind (conn->fd, (struct sockaddr *) &uaddr, sizeof (uaddr)) == -1)
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{
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conn->fd = -1;
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return FALSE;
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}
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listen (conn->fd, 5);
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if (!setup_connection (conn))
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return FALSE;
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return TRUE;
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}
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static gboolean
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try_client (BaconMessageConnection *conn)
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{
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struct sockaddr_un uaddr;
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uaddr.sun_family = AF_UNIX;
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strncpy (uaddr.sun_path, conn->path,
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MIN(strlen(conn->path)+1, UNIX_PATH_MAX));
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conn->fd = socket (PF_UNIX, SOCK_STREAM, 0);
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if (connect (conn->fd, (struct sockaddr *) &uaddr,
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sizeof (uaddr)) == -1)
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{
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conn->fd = -1;
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return FALSE;
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}
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return setup_connection (conn);
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}
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BaconMessageConnection *
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bacon_message_connection_new (const char *prefix)
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{
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BaconMessageConnection *conn;
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g_return_val_if_fail (prefix != NULL, NULL);
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conn = g_new0 (BaconMessageConnection, 1);
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conn->path = socket_filename (prefix);
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if (test_is_socket (conn->path) == FALSE)
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{
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if (!try_server (conn))
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{
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bacon_message_connection_free (conn);
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return NULL;
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}
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conn->is_server = TRUE;
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return conn;
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}
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if (try_client (conn) == FALSE)
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{
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unlink (conn->path);
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try_server (conn);
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if (conn->fd == -1)
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{
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bacon_message_connection_free (conn);
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return NULL;
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}
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conn->is_server = TRUE;
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return conn;
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}
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conn->is_server = FALSE;
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return conn;
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}
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void
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bacon_message_connection_free (BaconMessageConnection *conn)
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{
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GSList *child_conn;
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g_return_if_fail (conn != NULL);
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/* Only servers can accept other connections */
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g_return_if_fail (conn->is_server != FALSE ||
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conn->accepted_connections == NULL);
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child_conn = conn->accepted_connections;
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while (child_conn != NULL) {
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bacon_message_connection_free (child_conn->data);
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child_conn = g_slist_next (child_conn);
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}
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g_slist_free (conn->accepted_connections);
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if (conn->conn_id) {
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g_source_remove (conn->conn_id);
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conn->conn_id = 0;
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}
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if (conn->chan) {
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g_io_channel_shutdown (conn->chan, FALSE, NULL);
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g_io_channel_unref (conn->chan);
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}
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if (conn->is_server != FALSE) {
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unlink (conn->path);
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}
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if (conn->fd != -1) {
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close (conn->fd);
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}
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g_free (conn->path);
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g_free (conn);
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}
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void
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bacon_message_connection_set_callback (BaconMessageConnection *conn,
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BaconMessageReceivedFunc func,
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gpointer user_data)
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{
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g_return_if_fail (conn != NULL);
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conn->func = func;
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conn->data = user_data;
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}
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void
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bacon_message_connection_send (BaconMessageConnection *conn,
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const char *message)
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{
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g_return_if_fail (conn != NULL);
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g_return_if_fail (message != NULL);
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g_io_channel_write_chars (conn->chan, message, strlen (message),
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NULL, NULL);
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g_io_channel_write_chars (conn->chan, "\n", 1, NULL, NULL);
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g_io_channel_flush (conn->chan, NULL);
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}
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gboolean
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bacon_message_connection_get_is_server (BaconMessageConnection *conn)
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{
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g_return_val_if_fail (conn != NULL, FALSE);
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return conn->is_server;
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}
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