| /* |
| * |
| * BlueZ - Bluetooth protocol stack for Linux |
| * |
| * Copyright (C) 2006-2007 Marcel Holtmann <marcel@holtmann.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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| * |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/wait.h> |
| |
| #include <glib.h> |
| |
| #include "logging.h" |
| #include "process.h" |
| |
| static void child_exit(GPid pid, gint status, gpointer data) |
| { |
| debug("Child with PID %d exits with status %d", pid, status); |
| |
| debug("Exit status %d", WEXITSTATUS(status)); |
| } |
| |
| int create_reader(uid_t uid, const char *pathname, |
| GIOFunc func, gpointer user_data) |
| { |
| pid_t pid; |
| unsigned char buf[512]; |
| int fd, pfd[2], len, written; |
| |
| if (pipe(pfd) < 0) { |
| error("Failed to create new pipe"); |
| return -1; |
| } |
| |
| pid = fork(); |
| if (pid < 0) { |
| error("Failed to fork new process"); |
| close(pfd[0]); |
| close(pfd[1]); |
| return -1; |
| } |
| |
| if (pid > 0) { |
| GIOChannel *io; |
| |
| g_child_watch_add(pid, child_exit, NULL); |
| |
| close(pfd[1]); |
| |
| io = g_io_channel_unix_new(pfd[0]); |
| g_io_channel_set_close_on_unref(io, TRUE); |
| |
| g_io_add_watch(io, G_IO_IN | G_IO_ERR | G_IO_HUP, func, |
| user_data); |
| |
| g_io_channel_unref(io); |
| |
| return 0; |
| } |
| |
| /* Child process */ |
| |
| close(pfd[0]); |
| |
| if (setuid(uid) < 0) { |
| error("Failed to switch to UID %d", uid); |
| close(pfd[1]); |
| exit(EXIT_FAILURE); |
| } |
| |
| fd = open(pathname, O_RDONLY); |
| if (fd < 0) { |
| error("Failed to open file %s: %s", |
| pathname, strerror(errno)); |
| close(pfd[1]); |
| exit(EXIT_FAILURE); |
| } |
| |
| while (1) { |
| len = read(fd, buf, sizeof(buf)); |
| if (len <= 0) { |
| debug("Reading failed"); |
| break; |
| } |
| |
| written = write(pfd[1], buf, len); |
| if (written < len) { |
| debug("Writing failed"); |
| break; |
| } |
| } |
| |
| debug("Reader finished"); |
| |
| close(fd); |
| |
| close(pfd[1]); |
| |
| exit(EXIT_SUCCESS); |
| } |