ddbf960574
Follow-up for: #17702 Alsoe, see earlier review comment: https://github.com/systemd/systemd/pull/17702#pullrequestreview-552329600
1407 lines
41 KiB
C
1407 lines
41 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <linux/kd.h>
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#include <linux/tiocl.h>
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#include <linux/vt.h>
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#include <poll.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <sys/inotify.h>
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#include <sys/ioctl.h>
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#include <sys/sysmacros.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/utsname.h>
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#include <termios.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "copy.h"
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#include "def.h"
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#include "env-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fs-util.h"
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#include "io-util.h"
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#include "log.h"
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#include "macro.h"
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#include "namespace-util.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "proc-cmdline.h"
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#include "process-util.h"
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#include "socket-util.h"
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#include "stat-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "terminal-util.h"
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#include "time-util.h"
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#include "util.h"
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static volatile unsigned cached_columns = 0;
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static volatile unsigned cached_lines = 0;
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static volatile int cached_on_tty = -1;
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static volatile int cached_color_mode = _COLOR_INVALID;
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static volatile int cached_underline_enabled = -1;
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int chvt(int vt) {
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_cleanup_close_ int fd;
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/* Switch to the specified vt number. If the VT is specified <= 0 switch to the VT the kernel log messages go,
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* if that's configured. */
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fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
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if (fd < 0)
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return -errno;
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if (vt <= 0) {
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int tiocl[2] = {
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TIOCL_GETKMSGREDIRECT,
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0
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};
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if (ioctl(fd, TIOCLINUX, tiocl) < 0)
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return -errno;
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vt = tiocl[0] <= 0 ? 1 : tiocl[0];
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}
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if (ioctl(fd, VT_ACTIVATE, vt) < 0)
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return -errno;
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return 0;
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}
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int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) {
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_cleanup_free_ char *line = NULL;
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struct termios old_termios;
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int r, fd;
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assert(f);
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assert(ret);
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/* If this is a terminal, then switch canonical mode off, so that we can read a single
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* character. (Note that fmemopen() streams do not have an fd associated with them, let's handle that
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* nicely.) */
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fd = fileno(f);
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if (fd >= 0 && tcgetattr(fd, &old_termios) >= 0) {
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struct termios new_termios = old_termios;
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new_termios.c_lflag &= ~ICANON;
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new_termios.c_cc[VMIN] = 1;
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new_termios.c_cc[VTIME] = 0;
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if (tcsetattr(fd, TCSADRAIN, &new_termios) >= 0) {
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char c;
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if (t != USEC_INFINITY) {
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if (fd_wait_for_event(fd, POLLIN, t) <= 0) {
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(void) tcsetattr(fd, TCSADRAIN, &old_termios);
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return -ETIMEDOUT;
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}
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}
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r = safe_fgetc(f, &c);
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(void) tcsetattr(fd, TCSADRAIN, &old_termios);
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if (r < 0)
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return r;
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if (r == 0)
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return -EIO;
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if (need_nl)
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*need_nl = c != '\n';
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*ret = c;
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return 0;
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}
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}
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if (t != USEC_INFINITY && fd > 0) {
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/* Let's wait the specified amount of time for input. When we have no fd we skip this, under
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* the assumption that this is an fmemopen() stream or so where waiting doesn't make sense
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* anyway, as the data is either already in the stream or cannot possible be placed there
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* while we access the stream */
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if (fd_wait_for_event(fd, POLLIN, t) <= 0)
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return -ETIMEDOUT;
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}
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/* If this is not a terminal, then read a full line instead */
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r = read_line(f, 16, &line); /* longer than necessary, to eat up UTF-8 chars/vt100 key sequences */
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if (r < 0)
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return r;
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if (r == 0)
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return -EIO;
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if (strlen(line) != 1)
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return -EBADMSG;
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if (need_nl)
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*need_nl = false;
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*ret = line[0];
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return 0;
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}
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#define DEFAULT_ASK_REFRESH_USEC (2*USEC_PER_SEC)
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int ask_char(char *ret, const char *replies, const char *fmt, ...) {
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int r;
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assert(ret);
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assert(replies);
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assert(fmt);
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for (;;) {
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va_list ap;
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char c;
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bool need_nl = true;
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fputs(ansi_highlight(), stdout);
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putchar('\r');
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va_start(ap, fmt);
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vprintf(fmt, ap);
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va_end(ap);
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fputs(ansi_normal(), stdout);
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fflush(stdout);
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r = read_one_char(stdin, &c, DEFAULT_ASK_REFRESH_USEC, &need_nl);
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if (r < 0) {
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if (r == -ETIMEDOUT)
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continue;
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if (r == -EBADMSG) {
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puts("Bad input, please try again.");
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continue;
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}
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putchar('\n');
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return r;
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}
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if (need_nl)
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putchar('\n');
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if (strchr(replies, c)) {
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*ret = c;
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return 0;
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}
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puts("Read unexpected character, please try again.");
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}
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}
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int ask_string(char **ret, const char *text, ...) {
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_cleanup_free_ char *line = NULL;
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va_list ap;
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int r;
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assert(ret);
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assert(text);
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fputs(ansi_highlight(), stdout);
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va_start(ap, text);
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vprintf(text, ap);
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va_end(ap);
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fputs(ansi_normal(), stdout);
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fflush(stdout);
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r = read_line(stdin, LONG_LINE_MAX, &line);
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if (r < 0)
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return r;
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if (r == 0)
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return -EIO;
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*ret = TAKE_PTR(line);
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return 0;
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}
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int reset_terminal_fd(int fd, bool switch_to_text) {
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struct termios termios;
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int r = 0;
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/* Set terminal to some sane defaults */
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assert(fd >= 0);
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/* We leave locked terminal attributes untouched, so that
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* Plymouth may set whatever it wants to set, and we don't
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* interfere with that. */
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/* Disable exclusive mode, just in case */
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(void) ioctl(fd, TIOCNXCL);
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/* Switch to text mode */
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if (switch_to_text)
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(void) ioctl(fd, KDSETMODE, KD_TEXT);
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/* Set default keyboard mode */
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(void) vt_reset_keyboard(fd);
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if (tcgetattr(fd, &termios) < 0) {
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r = -errno;
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goto finish;
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}
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/* We only reset the stuff that matters to the software. How
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* hardware is set up we don't touch assuming that somebody
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* else will do that for us */
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termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
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termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
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termios.c_oflag |= ONLCR;
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termios.c_cflag |= CREAD;
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termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
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termios.c_cc[VINTR] = 03; /* ^C */
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termios.c_cc[VQUIT] = 034; /* ^\ */
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termios.c_cc[VERASE] = 0177;
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termios.c_cc[VKILL] = 025; /* ^X */
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termios.c_cc[VEOF] = 04; /* ^D */
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termios.c_cc[VSTART] = 021; /* ^Q */
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termios.c_cc[VSTOP] = 023; /* ^S */
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termios.c_cc[VSUSP] = 032; /* ^Z */
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termios.c_cc[VLNEXT] = 026; /* ^V */
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termios.c_cc[VWERASE] = 027; /* ^W */
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termios.c_cc[VREPRINT] = 022; /* ^R */
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termios.c_cc[VEOL] = 0;
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termios.c_cc[VEOL2] = 0;
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termios.c_cc[VTIME] = 0;
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termios.c_cc[VMIN] = 1;
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if (tcsetattr(fd, TCSANOW, &termios) < 0)
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r = -errno;
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finish:
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/* Just in case, flush all crap out */
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(void) tcflush(fd, TCIOFLUSH);
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return r;
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}
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int reset_terminal(const char *name) {
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_cleanup_close_ int fd = -1;
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/* We open the terminal with O_NONBLOCK here, to ensure we
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* don't block on carrier if this is a terminal with carrier
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* configured. */
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fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
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if (fd < 0)
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return fd;
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return reset_terminal_fd(fd, true);
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}
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int open_terminal(const char *name, int mode) {
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unsigned c = 0;
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int fd;
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/*
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* If a TTY is in the process of being closed opening it might
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* cause EIO. This is horribly awful, but unlikely to be
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* changed in the kernel. Hence we work around this problem by
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* retrying a couple of times.
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*
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* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
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*/
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if (mode & O_CREAT)
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return -EINVAL;
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for (;;) {
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fd = open(name, mode, 0);
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if (fd >= 0)
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break;
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if (errno != EIO)
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return -errno;
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/* Max 1s in total */
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if (c >= 20)
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return -errno;
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usleep(50 * USEC_PER_MSEC);
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c++;
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}
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if (isatty(fd) <= 0) {
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safe_close(fd);
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return -ENOTTY;
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}
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return fd;
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}
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int acquire_terminal(
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const char *name,
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AcquireTerminalFlags flags,
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usec_t timeout) {
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_cleanup_close_ int notify = -1, fd = -1;
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usec_t ts = USEC_INFINITY;
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int r, wd = -1;
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assert(name);
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assert(IN_SET(flags & ~ACQUIRE_TERMINAL_PERMISSIVE, ACQUIRE_TERMINAL_TRY, ACQUIRE_TERMINAL_FORCE, ACQUIRE_TERMINAL_WAIT));
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/* We use inotify to be notified when the tty is closed. We create the watch before checking if we can actually
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* acquire it, so that we don't lose any event.
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*
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* Note: strictly speaking this actually watches for the device being closed, it does *not* really watch
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* whether a tty loses its controlling process. However, unless some rogue process uses TIOCNOTTY on /dev/tty
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* *after* closing its tty otherwise this will not become a problem. As long as the administrator makes sure to
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* not configure any service on the same tty as an untrusted user this should not be a problem. (Which they
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* probably should not do anyway.) */
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if ((flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_WAIT) {
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notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0));
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if (notify < 0)
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return -errno;
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wd = inotify_add_watch(notify, name, IN_CLOSE);
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if (wd < 0)
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return -errno;
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if (timeout != USEC_INFINITY)
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ts = now(CLOCK_MONOTONIC);
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}
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for (;;) {
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struct sigaction sa_old, sa_new = {
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.sa_handler = SIG_IGN,
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.sa_flags = SA_RESTART,
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};
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if (notify >= 0) {
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r = flush_fd(notify);
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if (r < 0)
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return r;
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}
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/* We pass here O_NOCTTY only so that we can check the return value TIOCSCTTY and have a reliable way
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* to figure out if we successfully became the controlling process of the tty */
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fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
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if (fd < 0)
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return fd;
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/* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed if we already own the tty. */
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assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
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/* First, try to get the tty */
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r = ioctl(fd, TIOCSCTTY,
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(flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_FORCE) < 0 ? -errno : 0;
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/* Reset signal handler to old value */
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assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
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/* Success? Exit the loop now! */
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if (r >= 0)
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break;
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/* Any failure besides -EPERM? Fail, regardless of the mode. */
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if (r != -EPERM)
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return r;
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if (flags & ACQUIRE_TERMINAL_PERMISSIVE) /* If we are in permissive mode, then EPERM is fine, turn this
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* into a success. Note that EPERM is also returned if we
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* already are the owner of the TTY. */
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break;
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if (flags != ACQUIRE_TERMINAL_WAIT) /* If we are in TRY or FORCE mode, then propagate EPERM as EPERM */
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return r;
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assert(notify >= 0);
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assert(wd >= 0);
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for (;;) {
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union inotify_event_buffer buffer;
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struct inotify_event *e;
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ssize_t l;
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if (timeout != USEC_INFINITY) {
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usec_t n;
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assert(ts != USEC_INFINITY);
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n = now(CLOCK_MONOTONIC);
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if (ts + timeout < n)
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return -ETIMEDOUT;
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r = fd_wait_for_event(notify, POLLIN, ts + timeout - n);
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if (r < 0)
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return r;
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if (r == 0)
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return -ETIMEDOUT;
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}
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l = read(notify, &buffer, sizeof(buffer));
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if (l < 0) {
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if (IN_SET(errno, EINTR, EAGAIN))
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continue;
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return -errno;
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}
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FOREACH_INOTIFY_EVENT(e, buffer, l) {
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if (e->mask & IN_Q_OVERFLOW) /* If we hit an inotify queue overflow, simply check if the terminal is up for grabs now. */
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break;
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if (e->wd != wd || !(e->mask & IN_CLOSE)) /* Safety checks */
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return -EIO;
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}
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break;
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}
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/* We close the tty fd here since if the old session ended our handle will be dead. It's important that
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* we do this after sleeping, so that we don't enter an endless loop. */
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fd = safe_close(fd);
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}
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return TAKE_FD(fd);
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}
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int release_terminal(void) {
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static const struct sigaction sa_new = {
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.sa_handler = SIG_IGN,
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.sa_flags = SA_RESTART,
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};
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_cleanup_close_ int fd = -1;
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struct sigaction sa_old;
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int r;
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fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
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if (fd < 0)
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return -errno;
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/* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
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* by our own TIOCNOTTY */
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assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
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r = ioctl(fd, TIOCNOTTY) < 0 ? -errno : 0;
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assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
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return r;
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}
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int terminal_vhangup_fd(int fd) {
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assert(fd >= 0);
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if (ioctl(fd, TIOCVHANGUP) < 0)
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return -errno;
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return 0;
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}
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int terminal_vhangup(const char *name) {
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_cleanup_close_ int fd;
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fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
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if (fd < 0)
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return fd;
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return terminal_vhangup_fd(fd);
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}
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|
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int vt_disallocate(const char *name) {
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const char *e;
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int r;
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|
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/* Deallocate the VT if possible. If not possible
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* (i.e. because it is the active one), at least clear it
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* entirely (including the scrollback buffer). */
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e = path_startswith(name, "/dev/");
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if (!e)
|
|
return -EINVAL;
|
|
|
|
if (tty_is_vc(name)) {
|
|
_cleanup_close_ int fd = -1;
|
|
unsigned u;
|
|
const char *n;
|
|
|
|
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);
|
|
if (r >= 0)
|
|
return 0;
|
|
if (errno != EBUSY)
|
|
return -errno;
|
|
}
|
|
|
|
/* So this is not a VT (in which case we cannot deallocate it),
|
|
* or we failed to deallocate. Let's at least clear the screen. */
|
|
|
|
_cleanup_close_ int fd2 = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
|
if (fd2 < 0)
|
|
return fd2;
|
|
|
|
(void) loop_write(fd2,
|
|
"\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, if we can. If we can't use
|
|
* /dev/null instead. This is particularly useful if /dev/console is turned off, e.g. if console=null
|
|
* is specified on the kernel command line. */
|
|
|
|
fd = acquire_terminal("/dev/console", ACQUIRE_TERMINAL_FORCE|ACQUIRE_TERMINAL_PERMISSIVE, USEC_INFINITY);
|
|
if (fd < 0) {
|
|
log_warning_errno(fd, "Failed to acquire terminal, using /dev/null stdin/stdout/stderr instead: %m");
|
|
|
|
r = make_null_stdio();
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to make /dev/null stdin/stdout/stderr: %m");
|
|
|
|
} else {
|
|
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, *path = NULL;
|
|
|
|
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 = path_join("/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);
|
|
continue;
|
|
}
|
|
|
|
r = strv_consume(&l, TAKE_PTR(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 (fd < 0)
|
|
return -EBADF;
|
|
|
|
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 > USHRT_MAX) {
|
|
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 (fd < 0)
|
|
return -EBADF;
|
|
|
|
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 > USHRT_MAX) {
|
|
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_color_mode = _COLOR_INVALID;
|
|
cached_underline_enabled = -1;
|
|
cached_on_tty = -1;
|
|
}
|
|
|
|
bool on_tty(void) {
|
|
|
|
/* We check both stdout and stderr, so that situations where pipes on the shell are used are reliably
|
|
* recognized, regardless if only the output or the errors are piped to some place. Since on_tty() is generally
|
|
* used to default to a safer, non-interactive, non-color mode of operation it's probably good to be defensive
|
|
* here, and check for both. Note that we don't check for STDIN_FILENO, because it should fine to use fancy
|
|
* terminal functionality when outputting stuff, even if the input is piped to us. */
|
|
|
|
if (cached_on_tty < 0)
|
|
cached_on_tty =
|
|
isatty(STDOUT_FILENO) > 0 &&
|
|
isatty(STDERR_FILENO) > 0;
|
|
|
|
return cached_on_tty;
|
|
}
|
|
|
|
int getttyname_malloc(int fd, char **ret) {
|
|
char path[PATH_MAX], *c; /* PATH_MAX is counted *with* the trailing NUL byte */
|
|
int r;
|
|
|
|
assert(fd >= 0);
|
|
assert(ret);
|
|
|
|
r = ttyname_r(fd, path, sizeof path); /* positive error */
|
|
assert(r >= 0);
|
|
if (r == ERANGE)
|
|
return -ENAMETOOLONG;
|
|
if (r > 0)
|
|
return -r;
|
|
|
|
c = strdup(skip_dev_prefix(path));
|
|
if (!c)
|
|
return -ENOMEM;
|
|
|
|
*ret = c;
|
|
return 0;
|
|
}
|
|
|
|
int getttyname_harder(int fd, char **ret) {
|
|
_cleanup_free_ char *s = NULL;
|
|
int r;
|
|
|
|
r = getttyname_malloc(fd, &s);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (streq(s, "tty"))
|
|
return get_ctty(0, NULL, ret);
|
|
|
|
*ret = TAKE_PTR(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 *ret_devnr, char **ret) {
|
|
_cleanup_free_ char *fn = NULL, *b = NULL;
|
|
dev_t devnr;
|
|
int r;
|
|
|
|
r = get_ctty_devnr(pid, &devnr);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = device_path_make_canonical(S_IFCHR, devnr, &fn);
|
|
if (r < 0) {
|
|
if (r != -ENOENT) /* No symlink for this in /dev/char/? */
|
|
return r;
|
|
|
|
if (major(devnr) == 136) {
|
|
/* This is an ugly hack: PTY devices are not listed in /dev/char/, as they don't follow the
|
|
* Linux device model. This means we have no nice way to match them up against their actual
|
|
* device node. Let's hence do the check by the fixed, assigned major number. Normally we try
|
|
* to avoid such fixed major/minor matches, but there appears to nother nice way to handle
|
|
* this. */
|
|
|
|
if (asprintf(&b, "pts/%u", minor(devnr)) < 0)
|
|
return -ENOMEM;
|
|
} else {
|
|
/* Probably something similar to the ptys which have no symlink in /dev/char/. Let's return
|
|
* something vaguely useful. */
|
|
|
|
r = device_path_make_major_minor(S_IFCHR, devnr, &fn);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
if (!b) {
|
|
const char *w;
|
|
|
|
w = path_startswith(fn, "/dev/");
|
|
if (w) {
|
|
b = strdup(w);
|
|
if (!b)
|
|
return -ENOMEM;
|
|
} else
|
|
b = TAKE_PTR(fn);
|
|
}
|
|
|
|
if (ret)
|
|
*ret = TAKE_PTR(b);
|
|
|
|
if (ret_devnr)
|
|
*ret_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);
|
|
|
|
if (l > SIZE_MAX / 2)
|
|
return -ENOMEM;
|
|
|
|
l *= 2;
|
|
}
|
|
}
|
|
|
|
int openpt_allocate(int flags, char **ret_slave) {
|
|
_cleanup_close_ int fd = -1;
|
|
_cleanup_free_ char *p = NULL;
|
|
int r;
|
|
|
|
fd = posix_openpt(flags|O_NOCTTY|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return -errno;
|
|
|
|
if (ret_slave) {
|
|
r = ptsname_malloc(fd, &p);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (!path_startswith(p, "/dev/pts/"))
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (unlockpt(fd) < 0)
|
|
return -errno;
|
|
|
|
if (ret_slave)
|
|
*ret_slave = TAKE_PTR(p);
|
|
|
|
return TAKE_FD(fd);
|
|
}
|
|
|
|
static 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_allocate_in_namespace(pid_t pid, int flags, char **ret_slave) {
|
|
_cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1, fd = -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 = namespace_fork("(sd-openptns)", "(sd-openpt)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG,
|
|
pidnsfd, mntnsfd, -1, usernsfd, rootfd, &child);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0) {
|
|
pair[0] = safe_close(pair[0]);
|
|
|
|
fd = openpt_allocate(flags, NULL);
|
|
if (fd < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (send_one_fd(pair[1], fd, 0) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
_exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
pair[1] = safe_close(pair[1]);
|
|
|
|
r = wait_for_terminate_and_check("(sd-openptns)", child, 0);
|
|
if (r < 0)
|
|
return r;
|
|
if (r != EXIT_SUCCESS)
|
|
return -EIO;
|
|
|
|
fd = receive_one_fd(pair[0], 0);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
if (ret_slave) {
|
|
r = ptsname_namespace(fd, ret_slave);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
return TAKE_FD(fd);
|
|
}
|
|
|
|
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 = namespace_fork("(sd-terminalns)", "(sd-terminal)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG,
|
|
pidnsfd, mntnsfd, -1, usernsfd, rootfd, &child);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0) {
|
|
int master;
|
|
|
|
pair[0] = safe_close(pair[0]);
|
|
|
|
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-terminalns)", 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();
|
|
}
|
|
|
|
static ColorMode parse_systemd_colors(void) {
|
|
const char *e;
|
|
int r;
|
|
|
|
e = getenv("SYSTEMD_COLORS");
|
|
if (!e)
|
|
return _COLOR_INVALID;
|
|
if (streq(e, "16"))
|
|
return COLOR_16;
|
|
if (streq(e, "256"))
|
|
return COLOR_256;
|
|
r = parse_boolean(e);
|
|
if (r >= 0)
|
|
return r > 0 ? COLOR_ON : COLOR_OFF;
|
|
return _COLOR_INVALID;
|
|
}
|
|
|
|
ColorMode get_color_mode(void) {
|
|
|
|
/* Returns the mode used to choose output colors. The possible modes are COLOR_OFF for no colors,
|
|
* COLOR_16 for only the base 16 ANSI colors, COLOR_256 for more colors and COLOR_ON for unrestricted
|
|
* color output. For that we check $SYSTEMD_COLORS first (which is the explicit way to
|
|
* change the mode). 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 continuously due to fear
|
|
* of SAK, and hence things are a bit weird. */
|
|
ColorMode m;
|
|
|
|
if (cached_color_mode < 0) {
|
|
m = parse_systemd_colors();
|
|
if (m >= 0)
|
|
cached_color_mode = m;
|
|
else if (getenv("NO_COLOR"))
|
|
/* We only check for the presence of the variable; value is ignored. */
|
|
cached_color_mode = COLOR_OFF;
|
|
|
|
else if (getpid_cached() == 1)
|
|
/* PID1 outputs to the console without holding it open all the time.
|
|
*
|
|
* Note that the Linux console can only display 16 colors. We still enable 256 color
|
|
* mode even for PID1 output though (which typically goes to the Linux console),
|
|
* since the Linux console is able to parse the 256 color sequences and automatically
|
|
* map them to the closest color in the 16 color palette (since kernel 3.16). Doing
|
|
* 256 colors is nice for people who invoke systemd in a container or via a serial
|
|
* link or such, and use a true 256 color terminal to do so. */
|
|
cached_color_mode = getenv_terminal_is_dumb() ? COLOR_OFF : COLOR_256;
|
|
else
|
|
cached_color_mode = terminal_is_dumb() ? COLOR_OFF : COLOR_256;
|
|
}
|
|
|
|
return cached_color_mode;
|
|
}
|
|
|
|
bool dev_console_colors_enabled(void) {
|
|
_cleanup_free_ char *s = NULL;
|
|
ColorMode m;
|
|
|
|
/* 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. */
|
|
|
|
m = parse_systemd_colors();
|
|
if (m >= 0)
|
|
return m;
|
|
|
|
if (getenv("NO_COLOR"))
|
|
return false;
|
|
|
|
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;
|
|
}
|
|
|
|
int vt_restore(int fd) {
|
|
static const struct vt_mode mode = {
|
|
.mode = VT_AUTO,
|
|
};
|
|
int r, q = 0;
|
|
|
|
if (ioctl(fd, KDSETMODE, KD_TEXT) < 0)
|
|
q = log_debug_errno(errno, "Failed to set VT in text mode, ignoring: %m");
|
|
|
|
r = vt_reset_keyboard(fd);
|
|
if (r < 0) {
|
|
log_debug_errno(r, "Failed to reset keyboard mode, ignoring: %m");
|
|
if (q >= 0)
|
|
q = r;
|
|
}
|
|
|
|
if (ioctl(fd, VT_SETMODE, &mode) < 0) {
|
|
log_debug_errno(errno, "Failed to set VT_AUTO mode, ignoring: %m");
|
|
if (q >= 0)
|
|
q = -errno;
|
|
}
|
|
|
|
r = fchmod_and_chown(fd, TTY_MODE, 0, (gid_t) -1);
|
|
if (r < 0) {
|
|
log_debug_errno(r, "Failed to chmod()/chown() VT, ignoring: %m");
|
|
if (q >= 0)
|
|
q = r;
|
|
}
|
|
|
|
return q;
|
|
}
|
|
|
|
int vt_release(int fd, bool restore) {
|
|
assert(fd >= 0);
|
|
|
|
/* This function releases the VT by acknowledging the VT-switch signal
|
|
* sent by the kernel and optionally reset the VT in text and auto
|
|
* VT-switching modes. */
|
|
|
|
if (ioctl(fd, VT_RELDISP, 1) < 0)
|
|
return -errno;
|
|
|
|
if (restore)
|
|
return vt_restore(fd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void get_log_colors(int priority, const char **on, const char **off, const char **highlight) {
|
|
/* Note that this will initialize output variables only when there's something to output.
|
|
* The caller must pre-initialize to "" or NULL as appropriate. */
|
|
|
|
if (priority <= LOG_ERR) {
|
|
if (on)
|
|
*on = ansi_highlight_red();
|
|
if (off)
|
|
*off = ANSI_NORMAL;
|
|
if (highlight)
|
|
*highlight = ANSI_HIGHLIGHT;
|
|
|
|
} else if (priority <= LOG_WARNING) {
|
|
if (on)
|
|
*on = ansi_highlight_yellow();
|
|
if (off)
|
|
*off = ANSI_NORMAL;
|
|
if (highlight)
|
|
*highlight = ANSI_HIGHLIGHT;
|
|
|
|
} else if (priority <= LOG_NOTICE) {
|
|
if (on)
|
|
*on = ANSI_HIGHLIGHT;
|
|
if (off)
|
|
*off = ANSI_NORMAL;
|
|
if (highlight)
|
|
*highlight = ansi_highlight_red();
|
|
|
|
} else if (priority >= LOG_DEBUG) {
|
|
if (on)
|
|
*on = ansi_grey();
|
|
if (off)
|
|
*off = ANSI_NORMAL;
|
|
if (highlight)
|
|
*highlight = ansi_highlight_red();
|
|
}
|
|
}
|