mirror of
https://github.com/systemd/systemd.git
synced 2024-11-08 11:27:32 +03:00
354 lines
8.6 KiB
C
354 lines
8.6 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 General Public License as published by
|
|
the Free Software Foundation; either version 2 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
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
***/
|
|
|
|
#include <utmpx.h>
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
#include <sys/utsname.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <sys/poll.h>
|
|
|
|
#include "macro.h"
|
|
#include "utmp-wtmp.h"
|
|
|
|
int utmp_get_runlevel(int *runlevel, int *previous) {
|
|
struct utmpx lookup, *found;
|
|
int r;
|
|
const char *e;
|
|
|
|
assert(runlevel);
|
|
|
|
/* If these values are set in the environment this takes
|
|
* precedence. Presumably, sysvinit does this to work around a
|
|
* race condition that would otherwise exist where we'd always
|
|
* go to disk and hence might read runlevel data that might be
|
|
* very new and does not apply to the current script being
|
|
* executed. */
|
|
|
|
if ((e = getenv("RUNLEVEL")) && e[0] > 0) {
|
|
*runlevel = e[0];
|
|
|
|
if (previous) {
|
|
/* $PREVLEVEL seems to be an Upstart thing */
|
|
|
|
if ((e = getenv("PREVLEVEL")) && e[0] > 0)
|
|
*previous = e[0];
|
|
else
|
|
*previous = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (utmpxname(_PATH_UTMPX) < 0)
|
|
return -errno;
|
|
|
|
setutxent();
|
|
|
|
zero(lookup);
|
|
lookup.ut_type = RUN_LVL;
|
|
|
|
if (!(found = getutxid(&lookup)))
|
|
r = -errno;
|
|
else {
|
|
int a, b;
|
|
|
|
a = found->ut_pid & 0xFF;
|
|
b = (found->ut_pid >> 8) & 0xFF;
|
|
|
|
if (a < 0 || b < 0)
|
|
r = -EIO;
|
|
else {
|
|
*runlevel = a;
|
|
|
|
if (previous)
|
|
*previous = b;
|
|
r = 0;
|
|
}
|
|
}
|
|
|
|
endutxent();
|
|
|
|
return r;
|
|
}
|
|
|
|
static void init_entry(struct utmpx *store, usec_t t) {
|
|
struct utsname uts;
|
|
|
|
assert(store);
|
|
|
|
zero(*store);
|
|
zero(uts);
|
|
|
|
if (t <= 0)
|
|
t = now(CLOCK_REALTIME);
|
|
|
|
store->ut_tv.tv_sec = t / USEC_PER_SEC;
|
|
store->ut_tv.tv_usec = t % USEC_PER_SEC;
|
|
|
|
if (uname(&uts) >= 0)
|
|
strncpy(store->ut_host, uts.release, sizeof(store->ut_host));
|
|
|
|
strncpy(store->ut_line, "~", sizeof(store->ut_line)); /* or ~~ ? */
|
|
strncpy(store->ut_id, "~~", sizeof(store->ut_id));
|
|
}
|
|
|
|
static int write_entry_utmp(const struct utmpx *store) {
|
|
int r;
|
|
|
|
assert(store);
|
|
|
|
/* utmp is similar to wtmp, but there is only one entry for
|
|
* each entry type resp. user; i.e. basically a key/value
|
|
* table. */
|
|
|
|
if (utmpxname(_PATH_UTMPX) < 0)
|
|
return -errno;
|
|
|
|
setutxent();
|
|
|
|
if (!pututxline(store))
|
|
r = -errno;
|
|
else
|
|
r = 0;
|
|
|
|
endutxent();
|
|
|
|
return r;
|
|
}
|
|
|
|
static int write_entry_wtmp(const struct utmpx *store) {
|
|
assert(store);
|
|
|
|
/* wtmp is a simple append-only file where each entry is
|
|
simply appended to * the end; i.e. basically a log. */
|
|
|
|
errno = 0;
|
|
updwtmpx(_PATH_WTMPX, store);
|
|
return -errno;
|
|
}
|
|
|
|
static int write_entry_both(const struct utmpx *store) {
|
|
int r, s;
|
|
|
|
r = write_entry_utmp(store);
|
|
s = write_entry_wtmp(store);
|
|
|
|
if (r >= 0)
|
|
r = s;
|
|
|
|
/* If utmp/wtmp have been disabled, that's a good thing, hence
|
|
* ignore the errors */
|
|
if (r == -ENOENT)
|
|
r = 0;
|
|
|
|
return r;
|
|
}
|
|
|
|
int utmp_put_shutdown(usec_t t) {
|
|
struct utmpx store;
|
|
|
|
init_entry(&store, t);
|
|
|
|
store.ut_type = RUN_LVL;
|
|
strncpy(store.ut_user, "shutdown", sizeof(store.ut_user));
|
|
|
|
return write_entry_both(&store);
|
|
}
|
|
|
|
int utmp_put_reboot(usec_t t) {
|
|
struct utmpx store;
|
|
|
|
init_entry(&store, t);
|
|
|
|
store.ut_type = BOOT_TIME;
|
|
strncpy(store.ut_user, "reboot", sizeof(store.ut_user));
|
|
|
|
return write_entry_both(&store);
|
|
}
|
|
|
|
int utmp_put_runlevel(usec_t t, int runlevel, int previous) {
|
|
struct utmpx store;
|
|
int r;
|
|
|
|
assert(runlevel > 0);
|
|
|
|
if (previous <= 0) {
|
|
/* Find the old runlevel automatically */
|
|
|
|
if ((r = utmp_get_runlevel(&previous, NULL)) < 0) {
|
|
if (r != -ESRCH)
|
|
return r;
|
|
|
|
previous = 0;
|
|
}
|
|
}
|
|
|
|
if (previous == runlevel)
|
|
return 0;
|
|
|
|
init_entry(&store, t);
|
|
|
|
store.ut_type = RUN_LVL;
|
|
store.ut_pid = (runlevel & 0xFF) | ((previous & 0xFF) << 8);
|
|
strncpy(store.ut_user, "runlevel", sizeof(store.ut_user));
|
|
|
|
return write_entry_both(&store);
|
|
}
|
|
|
|
#define TIMEOUT_MSEC 50
|
|
|
|
static int write_to_terminal(const char *tty, const char *message) {
|
|
int fd, r;
|
|
const char *p;
|
|
size_t left;
|
|
usec_t end;
|
|
|
|
assert(tty);
|
|
assert(message);
|
|
|
|
if ((fd = open(tty, O_WRONLY|O_NDELAY|O_NOCTTY|O_CLOEXEC)) < 0)
|
|
return -errno;
|
|
|
|
if (!isatty(fd)) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
p = message;
|
|
left = strlen(message);
|
|
|
|
end = now(CLOCK_MONOTONIC) + TIMEOUT_MSEC*USEC_PER_MSEC;
|
|
|
|
while (left > 0) {
|
|
ssize_t n;
|
|
struct pollfd pollfd;
|
|
usec_t t;
|
|
int k;
|
|
|
|
t = now(CLOCK_MONOTONIC);
|
|
|
|
if (t >= end) {
|
|
r = -ETIME;
|
|
goto finish;
|
|
}
|
|
|
|
zero(pollfd);
|
|
pollfd.fd = fd;
|
|
pollfd.events = POLLOUT;
|
|
|
|
if ((k = poll(&pollfd, 1, (end - t) / USEC_PER_MSEC)) < 0)
|
|
return -errno;
|
|
|
|
if (k <= 0) {
|
|
r = -ETIME;
|
|
goto finish;
|
|
}
|
|
|
|
if ((n = write(fd, p, left)) < 0) {
|
|
|
|
if (errno == EAGAIN)
|
|
continue;
|
|
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
assert((size_t) n <= left);
|
|
|
|
p += n;
|
|
left -= n;
|
|
}
|
|
|
|
r = 0;
|
|
|
|
finish:
|
|
close_nointr_nofail(fd);
|
|
|
|
return r;
|
|
}
|
|
|
|
int utmp_wall(const char *message) {
|
|
struct utmpx *u;
|
|
char date[FORMAT_TIMESTAMP_MAX];
|
|
char *text = NULL, *hn = NULL, *un = NULL, *tty = NULL;
|
|
int r;
|
|
|
|
if (!(hn = gethostname_malloc()) ||
|
|
!(un = getlogname_malloc())) {
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
|
|
getttyname_malloc(&tty);
|
|
|
|
if (asprintf(&text,
|
|
"\a\r\n"
|
|
"Broadcast message from %s@%s%s%s (%s):\r\n\r\n"
|
|
"%s\r\n\r\n",
|
|
un, hn,
|
|
tty ? " on " : "", strempty(tty),
|
|
format_timestamp(date, sizeof(date), now(CLOCK_REALTIME)),
|
|
message) < 0) {
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
|
|
setutxent();
|
|
|
|
r = 0;
|
|
|
|
while ((u = getutxent())) {
|
|
int q;
|
|
const char *path;
|
|
char *buf = NULL;
|
|
|
|
if (u->ut_type != USER_PROCESS || u->ut_user[0] == 0)
|
|
continue;
|
|
|
|
if (path_startswith(u->ut_line, "/dev/"))
|
|
path = u->ut_line;
|
|
else {
|
|
if (asprintf(&buf, "/dev/%s", u->ut_line) < 0) {
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
|
|
path = buf;
|
|
}
|
|
|
|
if ((q = write_to_terminal(path, text)) < 0)
|
|
r = q;
|
|
|
|
free(buf);
|
|
}
|
|
|
|
finish:
|
|
free(hn);
|
|
free(un);
|
|
free(tty);
|
|
free(text);
|
|
|
|
return r;
|
|
}
|