From 13590ca98ac2fd4939b683adbfdd63392b559f3f Mon Sep 17 00:00:00 2001 From: Matthias Schiffer Date: Sat, 28 Nov 2015 14:58:01 +0100 Subject: Strip down procd to the necessary code, update copyright --- early.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 early.c (limited to 'early.c') diff --git a/early.c b/early.c new file mode 100644 index 0000000..92ec6bd --- /dev/null +++ b/early.c @@ -0,0 +1,84 @@ +/* + * Copyright (C) 2013 Felix Fietkau + * Copyright (C) 2013 John Crispin + * Copyright (C) 2015 Matthias Schiffer + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 + * 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 warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include + +#include +#include +#include +#include + +#include "procd.h" + +static void +early_console(const char *dev) +{ + struct stat s; + int dd; + + if (stat(dev, &s)) { + ERROR("Failed to stat %s\n", dev); + return; + } + + dd = open(dev, O_RDWR); + if (dd < 0) + dd = open("/dev/null", O_RDWR); + + dup2(dd, STDIN_FILENO); + dup2(dd, STDOUT_FILENO); + dup2(dd, STDERR_FILENO); + + if (dd != STDIN_FILENO && + dd != STDOUT_FILENO && + dd != STDERR_FILENO) + close(dd); + + fcntl(STDERR_FILENO, F_SETFL, fcntl(STDERR_FILENO, F_GETFL) | O_NONBLOCK); +} + +static void +early_mounts(void) +{ + unsigned int oldumask = umask(0); + + mount("proc", "/proc", "proc", MS_NOATIME | MS_NODEV | MS_NOEXEC | MS_NOSUID, 0); + mount("sys", "/sys", "sysfs", MS_NOATIME | MS_NODEV | MS_NOEXEC | MS_NOSUID, 0); + mount("cgroup", "/sys/fs/cgroup", "cgroup", MS_NODEV | MS_NOEXEC | MS_NOSUID, "none"); + mount("dev", "/dev", "devtmpfs", MS_NOATIME | MS_NOSUID, "mode=0755,size=512K"); + mkdir("/dev/pts", 0755); + mount("devpts", "/dev/pts", "devpts", MS_NOATIME | MS_NOEXEC | MS_NOSUID, "mode=600"); + mount("tmpfs", "/tmp", "tmpfs", MS_NOSUID | MS_NODEV | MS_NOATIME, 0); + + umask(oldumask); +} + +static void +early_env(void) +{ + setenv("PATH", "/bin:/sbin:/usr/bin:/usr/sbin", 1); +} + +void +procd_early(void) +{ + early_mounts(); + early_console("/dev/console"); + early_env(); + + LOG("Console is alive\n"); +} -- cgit v1.2.3