cb91deaf77
Follow-up for #8824
1443 lines
40 KiB
C
1443 lines
40 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
|
|
/***
|
|
This file is part of systemd.
|
|
|
|
Copyright 2010 Lennart Poettering
|
|
***/
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <limits.h>
|
|
#include <linux/kd.h>
|
|
#include <linux/tiocl.h>
|
|
#include <linux/vt.h>
|
|
#include <poll.h>
|
|
#include <signal.h>
|
|
#include <stdarg.h>
|
|
#include <stddef.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/inotify.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sysmacros.h>
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
#include <sys/utsname.h>
|
|
#include <termios.h>
|
|
#include <unistd.h>
|
|
|
|
#include "alloc-util.h"
|
|
#include "copy.h"
|
|
#include "def.h"
|
|
#include "env-util.h"
|
|
#include "fd-util.h"
|
|
#include "fileio.h"
|
|
#include "fs-util.h"
|
|
#include "io-util.h"
|
|
#include "log.h"
|
|
#include "macro.h"
|
|
#include "pager.h"
|
|
#include "parse-util.h"
|
|
#include "path-util.h"
|
|
#include "proc-cmdline.h"
|
|
#include "process-util.h"
|
|
#include "socket-util.h"
|
|
#include "stat-util.h"
|
|
#include "string-util.h"
|
|
#include "strv.h"
|
|
#include "terminal-util.h"
|
|
#include "time-util.h"
|
|
#include "util.h"
|
|
|
|
static volatile unsigned cached_columns = 0;
|
|
static volatile unsigned cached_lines = 0;
|
|
|
|
static volatile int cached_on_tty = -1;
|
|
static volatile int cached_colors_enabled = -1;
|
|
static volatile int cached_underline_enabled = -1;
|
|
|
|
int chvt(int vt) {
|
|
_cleanup_close_ int fd;
|
|
|
|
/* Switch to the specified vt number. If the VT is specified <= 0 switch to the VT the kernel log messages go,
|
|
* if that's configured. */
|
|
|
|
fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
|
|
if (fd < 0)
|
|
return -errno;
|
|
|
|
if (vt <= 0) {
|
|
int tiocl[2] = {
|
|
TIOCL_GETKMSGREDIRECT,
|
|
0
|
|
};
|
|
|
|
if (ioctl(fd, TIOCLINUX, tiocl) < 0)
|
|
return -errno;
|
|
|
|
vt = tiocl[0] <= 0 ? 1 : tiocl[0];
|
|
}
|
|
|
|
if (ioctl(fd, VT_ACTIVATE, vt) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) {
|
|
struct termios old_termios, new_termios;
|
|
char c, line[LINE_MAX];
|
|
|
|
assert(f);
|
|
assert(ret);
|
|
|
|
if (tcgetattr(fileno(f), &old_termios) >= 0) {
|
|
new_termios = old_termios;
|
|
|
|
new_termios.c_lflag &= ~ICANON;
|
|
new_termios.c_cc[VMIN] = 1;
|
|
new_termios.c_cc[VTIME] = 0;
|
|
|
|
if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
|
|
size_t k;
|
|
|
|
if (t != USEC_INFINITY) {
|
|
if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) {
|
|
tcsetattr(fileno(f), TCSADRAIN, &old_termios);
|
|
return -ETIMEDOUT;
|
|
}
|
|
}
|
|
|
|
k = fread(&c, 1, 1, f);
|
|
|
|
tcsetattr(fileno(f), TCSADRAIN, &old_termios);
|
|
|
|
if (k <= 0)
|
|
return -EIO;
|
|
|
|
if (need_nl)
|
|
*need_nl = c != '\n';
|
|
|
|
*ret = c;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (t != USEC_INFINITY) {
|
|
if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0)
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
errno = 0;
|
|
if (!fgets(line, sizeof(line), f))
|
|
return errno > 0 ? -errno : -EIO;
|
|
|
|
truncate_nl(line);
|
|
|
|
if (strlen(line) != 1)
|
|
return -EBADMSG;
|
|
|
|
if (need_nl)
|
|
*need_nl = false;
|
|
|
|
*ret = line[0];
|
|
return 0;
|
|
}
|
|
|
|
#define DEFAULT_ASK_REFRESH_USEC (2*USEC_PER_SEC)
|
|
|
|
int ask_char(char *ret, const char *replies, const char *fmt, ...) {
|
|
int r;
|
|
|
|
assert(ret);
|
|
assert(replies);
|
|
assert(fmt);
|
|
|
|
for (;;) {
|
|
va_list ap;
|
|
char c;
|
|
bool need_nl = true;
|
|
|
|
if (colors_enabled())
|
|
fputs(ANSI_HIGHLIGHT, stdout);
|
|
|
|
putchar('\r');
|
|
|
|
va_start(ap, fmt);
|
|
vprintf(fmt, ap);
|
|
va_end(ap);
|
|
|
|
if (colors_enabled())
|
|
fputs(ANSI_NORMAL, stdout);
|
|
|
|
fflush(stdout);
|
|
|
|
r = read_one_char(stdin, &c, DEFAULT_ASK_REFRESH_USEC, &need_nl);
|
|
if (r < 0) {
|
|
|
|
if (r == -ETIMEDOUT)
|
|
continue;
|
|
|
|
if (r == -EBADMSG) {
|
|
puts("Bad input, please try again.");
|
|
continue;
|
|
}
|
|
|
|
putchar('\n');
|
|
return r;
|
|
}
|
|
|
|
if (need_nl)
|
|
putchar('\n');
|
|
|
|
if (strchr(replies, c)) {
|
|
*ret = c;
|
|
return 0;
|
|
}
|
|
|
|
puts("Read unexpected character, please try again.");
|
|
}
|
|
}
|
|
|
|
int ask_string(char **ret, const char *text, ...) {
|
|
assert(ret);
|
|
assert(text);
|
|
|
|
for (;;) {
|
|
char line[LINE_MAX];
|
|
va_list ap;
|
|
|
|
if (colors_enabled())
|
|
fputs(ANSI_HIGHLIGHT, stdout);
|
|
|
|
va_start(ap, text);
|
|
vprintf(text, ap);
|
|
va_end(ap);
|
|
|
|
if (colors_enabled())
|
|
fputs(ANSI_NORMAL, stdout);
|
|
|
|
fflush(stdout);
|
|
|
|
errno = 0;
|
|
if (!fgets(line, sizeof(line), stdin))
|
|
return errno > 0 ? -errno : -EIO;
|
|
|
|
if (!endswith(line, "\n"))
|
|
putchar('\n');
|
|
else {
|
|
char *s;
|
|
|
|
if (isempty(line))
|
|
continue;
|
|
|
|
truncate_nl(line);
|
|
s = strdup(line);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
*ret = s;
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
int reset_terminal_fd(int fd, bool switch_to_text) {
|
|
struct termios termios;
|
|
int r = 0;
|
|
|
|
/* Set terminal to some sane defaults */
|
|
|
|
assert(fd >= 0);
|
|
|
|
/* We leave locked terminal attributes untouched, so that
|
|
* Plymouth may set whatever it wants to set, and we don't
|
|
* interfere with that. */
|
|
|
|
/* Disable exclusive mode, just in case */
|
|
(void) ioctl(fd, TIOCNXCL);
|
|
|
|
/* Switch to text mode */
|
|
if (switch_to_text)
|
|
(void) ioctl(fd, KDSETMODE, KD_TEXT);
|
|
|
|
/* Set default keyboard mode */
|
|
(void) vt_reset_keyboard(fd);
|
|
|
|
if (tcgetattr(fd, &termios) < 0) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
/* We only reset the stuff that matters to the software. How
|
|
* hardware is set up we don't touch assuming that somebody
|
|
* else will do that for us */
|
|
|
|
termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
|
|
termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
|
|
termios.c_oflag |= ONLCR;
|
|
termios.c_cflag |= CREAD;
|
|
termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
|
|
|
|
termios.c_cc[VINTR] = 03; /* ^C */
|
|
termios.c_cc[VQUIT] = 034; /* ^\ */
|
|
termios.c_cc[VERASE] = 0177;
|
|
termios.c_cc[VKILL] = 025; /* ^X */
|
|
termios.c_cc[VEOF] = 04; /* ^D */
|
|
termios.c_cc[VSTART] = 021; /* ^Q */
|
|
termios.c_cc[VSTOP] = 023; /* ^S */
|
|
termios.c_cc[VSUSP] = 032; /* ^Z */
|
|
termios.c_cc[VLNEXT] = 026; /* ^V */
|
|
termios.c_cc[VWERASE] = 027; /* ^W */
|
|
termios.c_cc[VREPRINT] = 022; /* ^R */
|
|
termios.c_cc[VEOL] = 0;
|
|
termios.c_cc[VEOL2] = 0;
|
|
|
|
termios.c_cc[VTIME] = 0;
|
|
termios.c_cc[VMIN] = 1;
|
|
|
|
if (tcsetattr(fd, TCSANOW, &termios) < 0)
|
|
r = -errno;
|
|
|
|
finish:
|
|
/* Just in case, flush all crap out */
|
|
(void) tcflush(fd, TCIOFLUSH);
|
|
|
|
return r;
|
|
}
|
|
|
|
int reset_terminal(const char *name) {
|
|
_cleanup_close_ int fd = -1;
|
|
|
|
/* We open the terminal with O_NONBLOCK here, to ensure we
|
|
* don't block on carrier if this is a terminal with carrier
|
|
* configured. */
|
|
|
|
fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
return reset_terminal_fd(fd, true);
|
|
}
|
|
|
|
int open_terminal(const char *name, int mode) {
|
|
unsigned c = 0;
|
|
int fd;
|
|
|
|
/*
|
|
* If a TTY is in the process of being closed opening it might
|
|
* cause EIO. This is horribly awful, but unlikely to be
|
|
* changed in the kernel. Hence we work around this problem by
|
|
* retrying a couple of times.
|
|
*
|
|
* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
|
|
*/
|
|
|
|
if (mode & O_CREAT)
|
|
return -EINVAL;
|
|
|
|
for (;;) {
|
|
fd = open(name, mode, 0);
|
|
if (fd >= 0)
|
|
break;
|
|
|
|
if (errno != EIO)
|
|
return -errno;
|
|
|
|
/* Max 1s in total */
|
|
if (c >= 20)
|
|
return -errno;
|
|
|
|
usleep(50 * USEC_PER_MSEC);
|
|
c++;
|
|
}
|
|
|
|
if (isatty(fd) <= 0) {
|
|
safe_close(fd);
|
|
return -ENOTTY;
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
int acquire_terminal(
|
|
const char *name,
|
|
AcquireTerminalFlags flags,
|
|
usec_t timeout) {
|
|
|
|
_cleanup_close_ int notify = -1, fd = -1;
|
|
usec_t ts = USEC_INFINITY;
|
|
int r, wd = -1;
|
|
|
|
assert(name);
|
|
assert(IN_SET(flags & ~ACQUIRE_TERMINAL_PERMISSIVE, ACQUIRE_TERMINAL_TRY, ACQUIRE_TERMINAL_FORCE, ACQUIRE_TERMINAL_WAIT));
|
|
|
|
/* We use inotify to be notified when the tty is closed. We create the watch before checking if we can actually
|
|
* acquire it, so that we don't lose any event.
|
|
*
|
|
* Note: strictly speaking this actually watches for the device being closed, it does *not* really watch
|
|
* whether a tty loses its controlling process. However, unless some rogue process uses TIOCNOTTY on /dev/tty
|
|
* *after* closing its tty otherwise this will not become a problem. As long as the administrator makes sure to
|
|
* not configure any service on the same tty as an untrusted user this should not be a problem. (Which they
|
|
* probably should not do anyway.) */
|
|
|
|
if ((flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_WAIT) {
|
|
notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0));
|
|
if (notify < 0)
|
|
return -errno;
|
|
|
|
wd = inotify_add_watch(notify, name, IN_CLOSE);
|
|
if (wd < 0)
|
|
return -errno;
|
|
|
|
if (timeout != USEC_INFINITY)
|
|
ts = now(CLOCK_MONOTONIC);
|
|
}
|
|
|
|
for (;;) {
|
|
struct sigaction sa_old, sa_new = {
|
|
.sa_handler = SIG_IGN,
|
|
.sa_flags = SA_RESTART,
|
|
};
|
|
|
|
if (notify >= 0) {
|
|
r = flush_fd(notify);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
/* We pass here O_NOCTTY only so that we can check the return value TIOCSCTTY and have a reliable way
|
|
* to figure out if we successfully became the controlling process of the tty */
|
|
fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
/* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed if we already own the tty. */
|
|
assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
|
|
|
|
/* First, try to get the tty */
|
|
r = ioctl(fd, TIOCSCTTY,
|
|
(flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_FORCE) < 0 ? -errno : 0;
|
|
|
|
/* Reset signal handler to old value */
|
|
assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
|
|
|
|
/* Success? Exit the loop now! */
|
|
if (r >= 0)
|
|
break;
|
|
|
|
/* Any failure besides -EPERM? Fail, regardless of the mode. */
|
|
if (r != -EPERM)
|
|
return r;
|
|
|
|
if (flags & ACQUIRE_TERMINAL_PERMISSIVE) /* If we are in permissive mode, then EPERM is fine, turn this
|
|
* into a success. Note that EPERM is also returned if we
|
|
* already are the owner of the TTY. */
|
|
break;
|
|
|
|
if (flags != ACQUIRE_TERMINAL_WAIT) /* If we are in TRY or FORCE mode, then propagate EPERM as EPERM */
|
|
return r;
|
|
|
|
assert(notify >= 0);
|
|
assert(wd >= 0);
|
|
|
|
for (;;) {
|
|
union inotify_event_buffer buffer;
|
|
struct inotify_event *e;
|
|
ssize_t l;
|
|
|
|
if (timeout != USEC_INFINITY) {
|
|
usec_t n;
|
|
|
|
assert(ts != USEC_INFINITY);
|
|
|
|
n = now(CLOCK_MONOTONIC);
|
|
if (ts + timeout < n)
|
|
return -ETIMEDOUT;
|
|
|
|
r = fd_wait_for_event(notify, POLLIN, ts + timeout - n);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
l = read(notify, &buffer, sizeof(buffer));
|
|
if (l < 0) {
|
|
if (IN_SET(errno, EINTR, EAGAIN))
|
|
continue;
|
|
|
|
return -errno;
|
|
}
|
|
|
|
FOREACH_INOTIFY_EVENT(e, buffer, l) {
|
|
if (e->mask & IN_Q_OVERFLOW) /* If we hit an inotify queue overflow, simply check if the terminal is up for grabs now. */
|
|
break;
|
|
|
|
if (e->wd != wd || !(e->mask & IN_CLOSE)) /* Safety checks */
|
|
return -EIO;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/* We close the tty fd here since if the old session ended our handle will be dead. It's important that
|
|
* we do this after sleeping, so that we don't enter an endless loop. */
|
|
fd = safe_close(fd);
|
|
}
|
|
|
|
return TAKE_FD(fd);
|
|
}
|
|
|
|
int release_terminal(void) {
|
|
static const struct sigaction sa_new = {
|
|
.sa_handler = SIG_IGN,
|
|
.sa_flags = SA_RESTART,
|
|
};
|
|
|
|
_cleanup_close_ int fd = -1;
|
|
struct sigaction sa_old;
|
|
int r;
|
|
|
|
fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
|
|
if (fd < 0)
|
|
return -errno;
|
|
|
|
/* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
|
|
* by our own TIOCNOTTY */
|
|
assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
|
|
|
|
r = ioctl(fd, TIOCNOTTY) < 0 ? -errno : 0;
|
|
|
|
assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
|
|
|
|
return r;
|
|
}
|
|
|
|
int terminal_vhangup_fd(int fd) {
|
|
assert(fd >= 0);
|
|
|
|
if (ioctl(fd, TIOCVHANGUP) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int terminal_vhangup(const char *name) {
|
|
_cleanup_close_ int fd;
|
|
|
|
fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
return terminal_vhangup_fd(fd);
|
|
}
|
|
|
|
int vt_disallocate(const char *name) {
|
|
_cleanup_close_ int fd = -1;
|
|
const char *e, *n;
|
|
unsigned u;
|
|
int r;
|
|
|
|
/* Deallocate the VT if possible. If not possible
|
|
* (i.e. because it is the active one), at least clear it
|
|
* entirely (including the scrollback buffer) */
|
|
|
|
e = path_startswith(name, "/dev/");
|
|
if (!e)
|
|
return -EINVAL;
|
|
|
|
if (!tty_is_vc(name)) {
|
|
/* So this is not a VT. I guess we cannot deallocate
|
|
* it then. But let's at least clear the screen */
|
|
|
|
fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
loop_write(fd,
|
|
"\033[r" /* clear scrolling region */
|
|
"\033[H" /* move home */
|
|
"\033[2J", /* clear screen */
|
|
10, false);
|
|
return 0;
|
|
}
|
|
|
|
n = startswith(e, "tty");
|
|
if (!n)
|
|
return -EINVAL;
|
|
|
|
r = safe_atou(n, &u);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (u <= 0)
|
|
return -EINVAL;
|
|
|
|
/* Try to deallocate */
|
|
fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
r = ioctl(fd, VT_DISALLOCATE, u);
|
|
fd = safe_close(fd);
|
|
|
|
if (r >= 0)
|
|
return 0;
|
|
|
|
if (errno != EBUSY)
|
|
return -errno;
|
|
|
|
/* Couldn't deallocate, so let's clear it fully with
|
|
* scrollback */
|
|
fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
loop_write(fd,
|
|
"\033[r" /* clear scrolling region */
|
|
"\033[H" /* move home */
|
|
"\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */
|
|
10, false);
|
|
return 0;
|
|
}
|
|
|
|
int make_console_stdio(void) {
|
|
int fd, r;
|
|
|
|
/* Make /dev/console the controlling terminal and stdin/stdout/stderr */
|
|
|
|
fd = acquire_terminal("/dev/console", ACQUIRE_TERMINAL_FORCE|ACQUIRE_TERMINAL_PERMISSIVE, USEC_INFINITY);
|
|
if (fd < 0)
|
|
return log_error_errno(fd, "Failed to acquire terminal: %m");
|
|
|
|
r = reset_terminal_fd(fd, true);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to reset terminal, ignoring: %m");
|
|
|
|
r = rearrange_stdio(fd, fd, fd); /* This invalidates 'fd' both on success and on failure. */
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to make terminal stdin/stdout/stderr: %m");
|
|
|
|
reset_terminal_feature_caches();
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool tty_is_vc(const char *tty) {
|
|
assert(tty);
|
|
|
|
return vtnr_from_tty(tty) >= 0;
|
|
}
|
|
|
|
bool tty_is_console(const char *tty) {
|
|
assert(tty);
|
|
|
|
return streq(skip_dev_prefix(tty), "console");
|
|
}
|
|
|
|
int vtnr_from_tty(const char *tty) {
|
|
int i, r;
|
|
|
|
assert(tty);
|
|
|
|
tty = skip_dev_prefix(tty);
|
|
|
|
if (!startswith(tty, "tty") )
|
|
return -EINVAL;
|
|
|
|
if (tty[3] < '0' || tty[3] > '9')
|
|
return -EINVAL;
|
|
|
|
r = safe_atoi(tty+3, &i);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (i < 0 || i > 63)
|
|
return -EINVAL;
|
|
|
|
return i;
|
|
}
|
|
|
|
int resolve_dev_console(char **ret) {
|
|
_cleanup_free_ char *active = NULL;
|
|
char *tty;
|
|
int r;
|
|
|
|
assert(ret);
|
|
|
|
/* Resolve where /dev/console is pointing to, if /sys is actually ours (i.e. not read-only-mounted which is a
|
|
* sign for container setups) */
|
|
|
|
if (path_is_read_only_fs("/sys") > 0)
|
|
return -ENOMEDIUM;
|
|
|
|
r = read_one_line_file("/sys/class/tty/console/active", &active);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* If multiple log outputs are configured the last one is what /dev/console points to */
|
|
tty = strrchr(active, ' ');
|
|
if (tty)
|
|
tty++;
|
|
else
|
|
tty = active;
|
|
|
|
if (streq(tty, "tty0")) {
|
|
active = mfree(active);
|
|
|
|
/* Get the active VC (e.g. tty1) */
|
|
r = read_one_line_file("/sys/class/tty/tty0/active", &active);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
tty = active;
|
|
}
|
|
|
|
if (tty == active)
|
|
*ret = TAKE_PTR(active);
|
|
else {
|
|
char *tmp;
|
|
|
|
tmp = strdup(tty);
|
|
if (!tmp)
|
|
return -ENOMEM;
|
|
|
|
*ret = tmp;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int get_kernel_consoles(char ***ret) {
|
|
_cleanup_strv_free_ char **l = NULL;
|
|
_cleanup_free_ char *line = NULL;
|
|
const char *p;
|
|
int r;
|
|
|
|
assert(ret);
|
|
|
|
/* If /sys is mounted read-only this means we are running in some kind of container environment. In that
|
|
* case /sys would reflect the host system, not us, hence ignore the data we can read from it. */
|
|
if (path_is_read_only_fs("/sys") > 0)
|
|
goto fallback;
|
|
|
|
r = read_one_line_file("/sys/class/tty/console/active", &line);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
p = line;
|
|
for (;;) {
|
|
_cleanup_free_ char *tty = NULL;
|
|
char *path;
|
|
|
|
r = extract_first_word(&p, &tty, NULL, 0);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
break;
|
|
|
|
if (streq(tty, "tty0")) {
|
|
tty = mfree(tty);
|
|
r = read_one_line_file("/sys/class/tty/tty0/active", &tty);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
path = strappend("/dev/", tty);
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
if (access(path, F_OK) < 0) {
|
|
log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path);
|
|
free(path);
|
|
continue;
|
|
}
|
|
|
|
r = strv_consume(&l, path);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
if (strv_isempty(l)) {
|
|
log_debug("No devices found for system console");
|
|
goto fallback;
|
|
}
|
|
|
|
*ret = TAKE_PTR(l);
|
|
|
|
return 0;
|
|
|
|
fallback:
|
|
r = strv_extend(&l, "/dev/console");
|
|
if (r < 0)
|
|
return r;
|
|
|
|
*ret = TAKE_PTR(l);
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool tty_is_vc_resolve(const char *tty) {
|
|
_cleanup_free_ char *resolved = NULL;
|
|
|
|
assert(tty);
|
|
|
|
tty = skip_dev_prefix(tty);
|
|
|
|
if (streq(tty, "console")) {
|
|
if (resolve_dev_console(&resolved) < 0)
|
|
return false;
|
|
|
|
tty = resolved;
|
|
}
|
|
|
|
return tty_is_vc(tty);
|
|
}
|
|
|
|
const char *default_term_for_tty(const char *tty) {
|
|
return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220";
|
|
}
|
|
|
|
int fd_columns(int fd) {
|
|
struct winsize ws = {};
|
|
|
|
if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
|
|
return -errno;
|
|
|
|
if (ws.ws_col <= 0)
|
|
return -EIO;
|
|
|
|
return ws.ws_col;
|
|
}
|
|
|
|
unsigned columns(void) {
|
|
const char *e;
|
|
int c;
|
|
|
|
if (cached_columns > 0)
|
|
return cached_columns;
|
|
|
|
c = 0;
|
|
e = getenv("COLUMNS");
|
|
if (e)
|
|
(void) safe_atoi(e, &c);
|
|
|
|
if (c <= 0)
|
|
c = fd_columns(STDOUT_FILENO);
|
|
|
|
if (c <= 0)
|
|
c = 80;
|
|
|
|
cached_columns = c;
|
|
return cached_columns;
|
|
}
|
|
|
|
int fd_lines(int fd) {
|
|
struct winsize ws = {};
|
|
|
|
if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
|
|
return -errno;
|
|
|
|
if (ws.ws_row <= 0)
|
|
return -EIO;
|
|
|
|
return ws.ws_row;
|
|
}
|
|
|
|
unsigned lines(void) {
|
|
const char *e;
|
|
int l;
|
|
|
|
if (cached_lines > 0)
|
|
return cached_lines;
|
|
|
|
l = 0;
|
|
e = getenv("LINES");
|
|
if (e)
|
|
(void) safe_atoi(e, &l);
|
|
|
|
if (l <= 0)
|
|
l = fd_lines(STDOUT_FILENO);
|
|
|
|
if (l <= 0)
|
|
l = 24;
|
|
|
|
cached_lines = l;
|
|
return cached_lines;
|
|
}
|
|
|
|
/* intended to be used as a SIGWINCH sighandler */
|
|
void columns_lines_cache_reset(int signum) {
|
|
cached_columns = 0;
|
|
cached_lines = 0;
|
|
}
|
|
|
|
void reset_terminal_feature_caches(void) {
|
|
cached_columns = 0;
|
|
cached_lines = 0;
|
|
|
|
cached_colors_enabled = -1;
|
|
cached_underline_enabled = -1;
|
|
cached_on_tty = -1;
|
|
}
|
|
|
|
bool on_tty(void) {
|
|
if (cached_on_tty < 0)
|
|
cached_on_tty = isatty(STDOUT_FILENO) > 0;
|
|
|
|
return cached_on_tty;
|
|
}
|
|
|
|
int getttyname_malloc(int fd, char **ret) {
|
|
size_t l = 100;
|
|
int r;
|
|
|
|
assert(fd >= 0);
|
|
assert(ret);
|
|
|
|
for (;;) {
|
|
char path[l];
|
|
|
|
r = ttyname_r(fd, path, sizeof(path));
|
|
if (r == 0) {
|
|
char *c;
|
|
|
|
c = strdup(skip_dev_prefix(path));
|
|
if (!c)
|
|
return -ENOMEM;
|
|
|
|
*ret = c;
|
|
return 0;
|
|
}
|
|
|
|
if (r != ERANGE)
|
|
return -r;
|
|
|
|
l *= 2;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int getttyname_harder(int fd, char **r) {
|
|
int k;
|
|
char *s = NULL;
|
|
|
|
k = getttyname_malloc(fd, &s);
|
|
if (k < 0)
|
|
return k;
|
|
|
|
if (streq(s, "tty")) {
|
|
free(s);
|
|
return get_ctty(0, NULL, r);
|
|
}
|
|
|
|
*r = s;
|
|
return 0;
|
|
}
|
|
|
|
int get_ctty_devnr(pid_t pid, dev_t *d) {
|
|
int r;
|
|
_cleanup_free_ char *line = NULL;
|
|
const char *p;
|
|
unsigned long ttynr;
|
|
|
|
assert(pid >= 0);
|
|
|
|
p = procfs_file_alloca(pid, "stat");
|
|
r = read_one_line_file(p, &line);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
p = strrchr(line, ')');
|
|
if (!p)
|
|
return -EIO;
|
|
|
|
p++;
|
|
|
|
if (sscanf(p, " "
|
|
"%*c " /* state */
|
|
"%*d " /* ppid */
|
|
"%*d " /* pgrp */
|
|
"%*d " /* session */
|
|
"%lu ", /* ttynr */
|
|
&ttynr) != 1)
|
|
return -EIO;
|
|
|
|
if (major(ttynr) == 0 && minor(ttynr) == 0)
|
|
return -ENXIO;
|
|
|
|
if (d)
|
|
*d = (dev_t) ttynr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
|
|
char fn[STRLEN("/dev/char/") + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL;
|
|
_cleanup_free_ char *s = NULL;
|
|
const char *p;
|
|
dev_t devnr;
|
|
int k;
|
|
|
|
assert(r);
|
|
|
|
k = get_ctty_devnr(pid, &devnr);
|
|
if (k < 0)
|
|
return k;
|
|
|
|
sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr));
|
|
|
|
k = readlink_malloc(fn, &s);
|
|
if (k < 0) {
|
|
|
|
if (k != -ENOENT)
|
|
return k;
|
|
|
|
/* This is an ugly hack */
|
|
if (major(devnr) == 136) {
|
|
if (asprintf(&b, "pts/%u", minor(devnr)) < 0)
|
|
return -ENOMEM;
|
|
} else {
|
|
/* Probably something like the ptys which have no
|
|
* symlink in /dev/char. Let's return something
|
|
* vaguely useful. */
|
|
|
|
b = strdup(fn + 5);
|
|
if (!b)
|
|
return -ENOMEM;
|
|
}
|
|
} else {
|
|
if (startswith(s, "/dev/"))
|
|
p = s + 5;
|
|
else if (startswith(s, "../"))
|
|
p = s + 3;
|
|
else
|
|
p = s;
|
|
|
|
b = strdup(p);
|
|
if (!b)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*r = b;
|
|
if (_devnr)
|
|
*_devnr = devnr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ptsname_malloc(int fd, char **ret) {
|
|
size_t l = 100;
|
|
|
|
assert(fd >= 0);
|
|
assert(ret);
|
|
|
|
for (;;) {
|
|
char *c;
|
|
|
|
c = new(char, l);
|
|
if (!c)
|
|
return -ENOMEM;
|
|
|
|
if (ptsname_r(fd, c, l) == 0) {
|
|
*ret = c;
|
|
return 0;
|
|
}
|
|
if (errno != ERANGE) {
|
|
free(c);
|
|
return -errno;
|
|
}
|
|
|
|
free(c);
|
|
l *= 2;
|
|
}
|
|
}
|
|
|
|
int ptsname_namespace(int pty, char **ret) {
|
|
int no = -1, r;
|
|
|
|
/* Like ptsname(), but doesn't assume that the path is
|
|
* accessible in the local namespace. */
|
|
|
|
r = ioctl(pty, TIOCGPTN, &no);
|
|
if (r < 0)
|
|
return -errno;
|
|
|
|
if (no < 0)
|
|
return -EIO;
|
|
|
|
if (asprintf(ret, "/dev/pts/%i", no) < 0)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int openpt_in_namespace(pid_t pid, int flags) {
|
|
_cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1;
|
|
_cleanup_close_pair_ int pair[2] = { -1, -1 };
|
|
pid_t child;
|
|
int r;
|
|
|
|
assert(pid > 0);
|
|
|
|
r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)
|
|
return -errno;
|
|
|
|
r = safe_fork("(sd-openpt)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0) {
|
|
int master;
|
|
|
|
pair[0] = safe_close(pair[0]);
|
|
|
|
r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd);
|
|
if (r < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC);
|
|
if (master < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (unlockpt(master) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (send_one_fd(pair[1], master, 0) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
_exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
pair[1] = safe_close(pair[1]);
|
|
|
|
r = wait_for_terminate_and_check("(sd-openpt)", child, 0);
|
|
if (r < 0)
|
|
return r;
|
|
if (r != EXIT_SUCCESS)
|
|
return -EIO;
|
|
|
|
return receive_one_fd(pair[0], 0);
|
|
}
|
|
|
|
int open_terminal_in_namespace(pid_t pid, const char *name, int mode) {
|
|
_cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1;
|
|
_cleanup_close_pair_ int pair[2] = { -1, -1 };
|
|
pid_t child;
|
|
int r;
|
|
|
|
r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)
|
|
return -errno;
|
|
|
|
r = safe_fork("(sd-terminal)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0) {
|
|
int master;
|
|
|
|
pair[0] = safe_close(pair[0]);
|
|
|
|
r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd);
|
|
if (r < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC);
|
|
if (master < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (send_one_fd(pair[1], master, 0) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
_exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
pair[1] = safe_close(pair[1]);
|
|
|
|
r = wait_for_terminate_and_check("(sd-terminal)", child, 0);
|
|
if (r < 0)
|
|
return r;
|
|
if (r != EXIT_SUCCESS)
|
|
return -EIO;
|
|
|
|
return receive_one_fd(pair[0], 0);
|
|
}
|
|
|
|
static bool getenv_terminal_is_dumb(void) {
|
|
const char *e;
|
|
|
|
e = getenv("TERM");
|
|
if (!e)
|
|
return true;
|
|
|
|
return streq(e, "dumb");
|
|
}
|
|
|
|
bool terminal_is_dumb(void) {
|
|
if (!on_tty())
|
|
return true;
|
|
|
|
return getenv_terminal_is_dumb();
|
|
}
|
|
|
|
bool colors_enabled(void) {
|
|
|
|
/* Returns true if colors are considered supported on our stdout. For that we check $SYSTEMD_COLORS first
|
|
* (which is the explicit way to turn colors on/off). If that didn't work we turn colors off unless we are on a
|
|
* TTY. And if we are on a TTY we turn it off if $TERM is set to "dumb". There's one special tweak though: if
|
|
* we are PID 1 then we do not check whether we are connected to a TTY, because we don't keep /dev/console open
|
|
* continously due to fear of SAK, and hence things are a bit weird. */
|
|
|
|
if (cached_colors_enabled < 0) {
|
|
int val;
|
|
|
|
val = getenv_bool("SYSTEMD_COLORS");
|
|
if (val >= 0)
|
|
cached_colors_enabled = val;
|
|
else if (getpid_cached() == 1)
|
|
/* PID1 outputs to the console without holding it open all the time */
|
|
cached_colors_enabled = !getenv_terminal_is_dumb();
|
|
else
|
|
cached_colors_enabled = !terminal_is_dumb();
|
|
}
|
|
|
|
return cached_colors_enabled;
|
|
}
|
|
|
|
bool dev_console_colors_enabled(void) {
|
|
_cleanup_free_ char *s = NULL;
|
|
int b;
|
|
|
|
/* Returns true if we assume that color is supported on /dev/console.
|
|
*
|
|
* For that we first check if we explicitly got told to use colors or not, by checking $SYSTEMD_COLORS. If that
|
|
* isn't set we check whether PID 1 has $TERM set, and if not, whether TERM is set on the kernel command
|
|
* line. If we find $TERM set we assume color if it's not set to "dumb", similarly to how regular
|
|
* colors_enabled() operates. */
|
|
|
|
b = getenv_bool("SYSTEMD_COLORS");
|
|
if (b >= 0)
|
|
return b;
|
|
|
|
if (getenv_for_pid(1, "TERM", &s) <= 0)
|
|
(void) proc_cmdline_get_key("TERM", 0, &s);
|
|
|
|
return !streq_ptr(s, "dumb");
|
|
}
|
|
|
|
bool underline_enabled(void) {
|
|
|
|
if (cached_underline_enabled < 0) {
|
|
|
|
/* The Linux console doesn't support underlining, turn it off, but only there. */
|
|
|
|
if (colors_enabled())
|
|
cached_underline_enabled = !streq_ptr(getenv("TERM"), "linux");
|
|
else
|
|
cached_underline_enabled = false;
|
|
}
|
|
|
|
return cached_underline_enabled;
|
|
}
|
|
|
|
int vt_default_utf8(void) {
|
|
_cleanup_free_ char *b = NULL;
|
|
int r;
|
|
|
|
/* Read the default VT UTF8 setting from the kernel */
|
|
|
|
r = read_one_line_file("/sys/module/vt/parameters/default_utf8", &b);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return parse_boolean(b);
|
|
}
|
|
|
|
int vt_reset_keyboard(int fd) {
|
|
int kb;
|
|
|
|
/* If we can't read the default, then default to unicode. It's 2017 after all. */
|
|
kb = vt_default_utf8() != 0 ? K_UNICODE : K_XLATE;
|
|
|
|
if (ioctl(fd, KDSKBMODE, kb) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool urlify_enabled(void) {
|
|
static int cached_urlify_enabled = -1;
|
|
|
|
/* Unfortunately 'less' doesn't support links like this yet 😭, hence let's disable this as long as there's a
|
|
* pager in effect. Let's drop this check as soon as less got fixed a and enough time passed so that it's safe
|
|
* to assume that a link-enabled 'less' version has hit most installations. */
|
|
|
|
if (cached_urlify_enabled < 0) {
|
|
int val;
|
|
|
|
val = getenv_bool("SYSTEMD_URLIFY");
|
|
if (val >= 0)
|
|
cached_urlify_enabled = val;
|
|
else
|
|
cached_urlify_enabled = colors_enabled() && !pager_have();
|
|
}
|
|
|
|
return cached_urlify_enabled;
|
|
}
|
|
|
|
int terminal_urlify(const char *url, const char *text, char **ret) {
|
|
char *n;
|
|
|
|
assert(url);
|
|
|
|
/* Takes an URL and a pretty string and formats it as clickable link for the terminal. See
|
|
* https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda for details. */
|
|
|
|
if (isempty(text))
|
|
text = url;
|
|
|
|
if (urlify_enabled())
|
|
n = strjoin("\x1B]8;;", url, "\a", text, "\x1B]8;;\a");
|
|
else
|
|
n = strdup(text);
|
|
if (!n)
|
|
return -ENOMEM;
|
|
|
|
*ret = n;
|
|
return 0;
|
|
}
|
|
|
|
int terminal_urlify_path(const char *path, const char *text, char **ret) {
|
|
_cleanup_free_ char *absolute = NULL;
|
|
struct utsname u;
|
|
const char *url;
|
|
int r;
|
|
|
|
assert(path);
|
|
|
|
/* Much like terminal_urlify() above, but takes a file system path as input
|
|
* and turns it into a proper file:// URL first. */
|
|
|
|
if (isempty(path))
|
|
return -EINVAL;
|
|
|
|
if (isempty(text))
|
|
text = path;
|
|
|
|
if (!urlify_enabled()) {
|
|
char *n;
|
|
|
|
n = strdup(text);
|
|
if (!n)
|
|
return -ENOMEM;
|
|
|
|
*ret = n;
|
|
return 0;
|
|
}
|
|
|
|
if (uname(&u) < 0)
|
|
return -errno;
|
|
|
|
if (!path_is_absolute(path)) {
|
|
r = path_make_absolute_cwd(path, &absolute);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
path = absolute;
|
|
}
|
|
|
|
/* As suggested by https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda, let's include the local
|
|
* hostname here. Note that we don't use gethostname_malloc() or gethostname_strict() since we are interested
|
|
* in the raw string the kernel has set, whatever it may be, under the assumption that terminals are not overly
|
|
* careful with validating the strings either. */
|
|
|
|
url = strjoina("file://", u.nodename, path);
|
|
|
|
return terminal_urlify(url, text, ret);
|
|
}
|
|
|
|
static int cat_file(const char *filename, bool newline) {
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
int r;
|
|
|
|
f = fopen(filename, "re");
|
|
if (!f)
|
|
return -errno;
|
|
|
|
printf("%s%s# %s%s\n",
|
|
newline ? "\n" : "",
|
|
ansi_highlight_blue(),
|
|
filename,
|
|
ansi_normal());
|
|
fflush(stdout);
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *line = NULL;
|
|
|
|
r = read_line(f, LONG_LINE_MAX, &line);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to read \"%s\": %m", filename);
|
|
if (r == 0)
|
|
break;
|
|
|
|
puts(line);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cat_files(const char *file, char **dropins, CatFlags flags) {
|
|
char **path;
|
|
int r;
|
|
|
|
if (file) {
|
|
r = cat_file(file, false);
|
|
if (r == -ENOENT && (flags & CAT_FLAGS_MAIN_FILE_OPTIONAL))
|
|
printf("%s# config file %s not found%s\n",
|
|
ansi_highlight_magenta(),
|
|
file,
|
|
ansi_normal());
|
|
else if (r < 0)
|
|
return log_warning_errno(r, "Failed to cat %s: %m", file);
|
|
}
|
|
|
|
STRV_FOREACH(path, dropins) {
|
|
r = cat_file(*path, file || path != dropins);
|
|
if (r < 0)
|
|
return log_warning_errno(r, "Failed to cat %s: %m", *path);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void print_separator(void) {
|
|
|
|
/* Outputs a separator line that resolves to whitespace when copied from the terminal. We do that by outputting
|
|
* one line filled with spaces with ANSI underline set, followed by a second (empty) line. */
|
|
|
|
if (underline_enabled()) {
|
|
size_t i, c;
|
|
|
|
c = columns();
|
|
|
|
flockfile(stdout);
|
|
fputs_unlocked(ANSI_UNDERLINE, stdout);
|
|
|
|
for (i = 0; i < c; i++)
|
|
fputc_unlocked(' ', stdout);
|
|
|
|
fputs_unlocked(ANSI_NORMAL "\n\n", stdout);
|
|
funlockfile(stdout);
|
|
} else
|
|
fputs("\n\n", stdout);
|
|
}
|