235 lines
7.2 KiB
C
235 lines
7.2 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
|
|
|
/***
|
|
This file is part of systemd.
|
|
|
|
Copyright 2010 Lennart Poettering
|
|
|
|
systemd is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
systemd 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
***/
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "fd-util.h"
|
|
#include "fileio.h"
|
|
#include "log.h"
|
|
#include "mkdir.h"
|
|
#include "path-util.h"
|
|
#include "process-util.h"
|
|
#include "string-util.h"
|
|
#include "terminal-util.h"
|
|
#include "unit-name.h"
|
|
#include "util.h"
|
|
#include "virt.h"
|
|
|
|
static const char *arg_dest = "/tmp";
|
|
|
|
static int add_symlink(const char *fservice, const char *tservice) {
|
|
char *from, *to;
|
|
int r;
|
|
|
|
assert(fservice);
|
|
assert(tservice);
|
|
|
|
from = strjoina(SYSTEM_DATA_UNIT_PATH "/", fservice);
|
|
to = strjoina(arg_dest, "/getty.target.wants/", tservice);
|
|
|
|
mkdir_parents_label(to, 0755);
|
|
|
|
r = symlink(from, to);
|
|
if (r < 0) {
|
|
/* In case console=hvc0 is passed this will very likely result in EEXIST */
|
|
if (errno == EEXIST)
|
|
return 0;
|
|
|
|
return log_error_errno(errno, "Failed to create symlink %s: %m", to);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int add_serial_getty(const char *tty) {
|
|
_cleanup_free_ char *n = NULL;
|
|
int r;
|
|
|
|
assert(tty);
|
|
|
|
log_debug("Automatically adding serial getty for /dev/%s.", tty);
|
|
|
|
r = unit_name_from_path_instance("serial-getty", tty, ".service", &n);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to generate service name: %m");
|
|
|
|
return add_symlink("serial-getty@.service", n);
|
|
}
|
|
|
|
static int add_container_getty(const char *tty) {
|
|
_cleanup_free_ char *n = NULL;
|
|
int r;
|
|
|
|
assert(tty);
|
|
|
|
log_debug("Automatically adding container getty for /dev/pts/%s.", tty);
|
|
|
|
r = unit_name_from_path_instance("container-getty", tty, ".service", &n);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to generate service name: %m");
|
|
|
|
return add_symlink("container-getty@.service", n);
|
|
}
|
|
|
|
static int verify_tty(const char *name) {
|
|
_cleanup_close_ int fd = -1;
|
|
const char *p;
|
|
|
|
/* Some TTYs are weird and have been enumerated but don't work
|
|
* when you try to use them, such as classic ttyS0 and
|
|
* friends. Let's check that and open the device and run
|
|
* isatty() on it. */
|
|
|
|
p = strjoina("/dev/", name);
|
|
|
|
/* O_NONBLOCK is essential here, to make sure we don't wait
|
|
* for DCD */
|
|
fd = open(p, O_RDWR|O_NONBLOCK|O_NOCTTY|O_CLOEXEC|O_NOFOLLOW);
|
|
if (fd < 0)
|
|
return -errno;
|
|
|
|
errno = 0;
|
|
if (isatty(fd) <= 0)
|
|
return errno ? -errno : -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
|
|
static const char virtualization_consoles[] =
|
|
"hvc0\0"
|
|
"xvc0\0"
|
|
"hvsi0\0"
|
|
"sclp_line0\0"
|
|
"ttysclp0\0"
|
|
"3270!tty1\0";
|
|
|
|
_cleanup_free_ char *active = NULL;
|
|
const char *j;
|
|
int r;
|
|
|
|
if (argc > 1 && argc != 4) {
|
|
log_error("This program takes three or no arguments.");
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
if (argc > 1)
|
|
arg_dest = argv[1];
|
|
|
|
log_set_target(LOG_TARGET_SAFE);
|
|
log_parse_environment();
|
|
log_open();
|
|
|
|
umask(0022);
|
|
|
|
if (detect_container() > 0) {
|
|
_cleanup_free_ char *container_ttys = NULL;
|
|
|
|
log_debug("Automatically adding console shell.");
|
|
|
|
if (add_symlink("console-getty.service", "console-getty.service") < 0)
|
|
return EXIT_FAILURE;
|
|
|
|
/* When $container_ttys is set for PID 1, spawn
|
|
* gettys on all ptys named therein. Note that despite
|
|
* the variable name we only support ptys here. */
|
|
|
|
r = getenv_for_pid(1, "container_ttys", &container_ttys);
|
|
if (r > 0) {
|
|
const char *word, *state;
|
|
size_t l;
|
|
|
|
FOREACH_WORD(word, l, container_ttys, state) {
|
|
const char *t;
|
|
char tty[l + 1];
|
|
|
|
memcpy(tty, word, l);
|
|
tty[l] = 0;
|
|
|
|
/* First strip off /dev/ if it is specified */
|
|
t = path_startswith(tty, "/dev/");
|
|
if (!t)
|
|
t = tty;
|
|
|
|
/* Then, make sure it's actually a pty */
|
|
t = path_startswith(t, "pts/");
|
|
if (!t)
|
|
continue;
|
|
|
|
if (add_container_getty(t) < 0)
|
|
return EXIT_FAILURE;
|
|
}
|
|
}
|
|
|
|
/* Don't add any further magic if we are in a container */
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
|
|
const char *word, *state;
|
|
size_t l;
|
|
|
|
/* Automatically add in a serial getty on all active
|
|
* kernel consoles */
|
|
FOREACH_WORD(word, l, active, state) {
|
|
_cleanup_free_ char *tty = NULL;
|
|
|
|
tty = strndup(word, l);
|
|
if (!tty) {
|
|
log_oom();
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
if (isempty(tty) || tty_is_vc(tty))
|
|
continue;
|
|
|
|
if (verify_tty(tty) < 0)
|
|
continue;
|
|
|
|
/* We assume that gettys on virtual terminals are
|
|
* started via manual configuration and do this magic
|
|
* only for non-VC terminals. */
|
|
|
|
if (add_serial_getty(tty) < 0)
|
|
return EXIT_FAILURE;
|
|
}
|
|
}
|
|
|
|
/* Automatically add in a serial getty on the first
|
|
* virtualizer console */
|
|
NULSTR_FOREACH(j, virtualization_consoles) {
|
|
char *p;
|
|
|
|
p = strjoina("/sys/class/tty/", j);
|
|
if (access(p, F_OK) < 0)
|
|
continue;
|
|
|
|
if (add_serial_getty(j) < 0)
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|