209 lines
6.3 KiB
C
209 lines
6.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "errno-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "generator.h"
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#include "log.h"
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#include "mkdir.h"
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#include "path-util.h"
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#include "process-util.h"
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#include "strv.h"
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#include "terminal-util.h"
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#include "unit-name.h"
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#include "util.h"
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#include "virt.h"
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static const char *arg_dest = NULL;
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static int add_symlink(const char *fservice, const char *tservice) {
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char *from, *to;
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int r;
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assert(fservice);
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assert(tservice);
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from = strjoina(SYSTEM_DATA_UNIT_PATH "/", fservice);
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to = strjoina(arg_dest, "/getty.target.wants/", tservice);
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mkdir_parents_label(to, 0755);
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r = symlink(from, to);
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if (r < 0) {
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/* In case console=hvc0 is passed this will very likely result in EEXIST */
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if (errno == EEXIST)
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return 0;
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return log_error_errno(errno, "Failed to create symlink %s: %m", to);
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}
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return 0;
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}
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static int add_serial_getty(const char *tty) {
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_cleanup_free_ char *n = NULL;
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int r;
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assert(tty);
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log_debug("Automatically adding serial getty for /dev/%s.", tty);
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r = unit_name_from_path_instance("serial-getty", tty, ".service", &n);
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if (r < 0)
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return log_error_errno(r, "Failed to generate service name: %m");
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return add_symlink("serial-getty@.service", n);
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}
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static int add_container_getty(const char *tty) {
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_cleanup_free_ char *n = NULL;
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int r;
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assert(tty);
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log_debug("Automatically adding container getty for /dev/pts/%s.", tty);
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r = unit_name_from_path_instance("container-getty", tty, ".service", &n);
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if (r < 0)
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return log_error_errno(r, "Failed to generate service name: %m");
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return add_symlink("container-getty@.service", n);
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}
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static int verify_tty(const char *name) {
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_cleanup_close_ int fd = -1;
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const char *p;
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/* Some TTYs are weird and have been enumerated but don't work
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* when you try to use them, such as classic ttyS0 and
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* friends. Let's check that and open the device and run
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* isatty() on it. */
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p = strjoina("/dev/", name);
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/* O_NONBLOCK is essential here, to make sure we don't wait
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* for DCD */
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fd = open(p, O_RDWR|O_NONBLOCK|O_NOCTTY|O_CLOEXEC|O_NOFOLLOW);
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if (fd < 0)
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return -errno;
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errno = 0;
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if (isatty(fd) <= 0)
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return errno_or_else(EIO);
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return 0;
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}
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static int run(const char *dest, const char *dest_early, const char *dest_late) {
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_cleanup_free_ char *active = NULL;
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const char *j;
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int r;
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assert_se(arg_dest = dest);
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if (detect_container() > 0) {
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_cleanup_free_ char *container_ttys = NULL;
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log_debug("Automatically adding console shell.");
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r = add_symlink("console-getty.service", "console-getty.service");
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if (r < 0)
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return r;
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/* When $container_ttys is set for PID 1, spawn
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* gettys on all ptys named therein. Note that despite
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* the variable name we only support ptys here. */
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r = getenv_for_pid(1, "container_ttys", &container_ttys);
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if (r > 0) {
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const char *word, *state;
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size_t l;
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FOREACH_WORD(word, l, container_ttys, state) {
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const char *t;
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char tty[l + 1];
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memcpy(tty, word, l);
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tty[l] = 0;
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/* First strip off /dev/ if it is specified */
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t = path_startswith(tty, "/dev/");
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if (!t)
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t = tty;
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/* Then, make sure it's actually a pty */
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t = path_startswith(t, "pts/");
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if (!t)
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continue;
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r = add_container_getty(t);
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if (r < 0)
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return r;
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}
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}
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/* Don't add any further magic if we are in a container */
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return 0;
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}
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if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
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const char *word, *state;
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size_t l;
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/* Automatically add in a serial getty on all active
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* kernel consoles */
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FOREACH_WORD(word, l, active, state) {
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_cleanup_free_ char *tty = NULL;
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tty = strndup(word, l);
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if (!tty)
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return log_oom();
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/* We assume that gettys on virtual terminals are
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* started via manual configuration and do this magic
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* only for non-VC terminals. */
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if (isempty(tty) || tty_is_vc(tty))
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continue;
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if (verify_tty(tty) < 0)
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continue;
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r = add_serial_getty(tty);
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if (r < 0)
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return r;
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}
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}
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/* Automatically add in a serial getty on the first
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* virtualizer console */
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FOREACH_STRING(j,
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"hvc0",
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"xvc0",
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"hvsi0",
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"sclp_line0",
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"ttysclp0",
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"3270!tty1") {
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_cleanup_free_ char *p = NULL;
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p = path_join("/sys/class/tty", j);
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if (!p)
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return -ENOMEM;
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if (access(p, F_OK) < 0)
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continue;
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r = add_serial_getty(j);
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if (r < 0)
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return r;
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}
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return 0;
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}
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DEFINE_MAIN_GENERATOR_FUNCTION(run);
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