240 lines
7.8 KiB
Diff
240 lines
7.8 KiB
Diff
---
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src/tty-ask-password-agent/tty-ask-password-agent.c | 171 +++++++++++++++++++-
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1 file changed, 166 insertions(+), 5 deletions(-)
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Index: systemd-221/src/tty-ask-password-agent/tty-ask-password-agent.c
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===================================================================
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--- systemd-221.orig/src/tty-ask-password-agent/tty-ask-password-agent.c
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+++ systemd-221/src/tty-ask-password-agent/tty-ask-password-agent.c
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@@ -31,6 +31,10 @@
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#include <getopt.h>
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#include <sys/signalfd.h>
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#include <fcntl.h>
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+#include <sys/prctl.h>
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+#include <signal.h>
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+#include <sys/wait.h>
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+#include <sys/mman.h>
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#include "util.h"
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#include "mkdir.h"
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@@ -42,6 +46,9 @@
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#include "strv.h"
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#include "build.h"
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#include "def.h"
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+#include "fileio.h"
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+#include "macro.h"
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+#include "list.h"
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#include "process-util.h"
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#include "terminal-util.h"
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#include "signal-util.h"
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@@ -53,6 +60,22 @@ static enum {
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ACTION_WALL
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} arg_action = ACTION_QUERY;
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+struct console {
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+ LIST_FIELDS(struct console, handle);
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+ const char *tty;
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+ pid_t pid;
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+ int id;
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+ char dev[];
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+};
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+
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+static volatile unsigned long *usemask;
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+static volatile sig_atomic_t sigchild;
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+static void chld_handler(int sig)
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+{
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+ (void)sig;
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+ ++sigchild;
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+}
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+
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static bool arg_plymouth = false;
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static bool arg_console = false;
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@@ -211,6 +234,58 @@ static int ask_password_plymouth(
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return 0;
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}
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+static const char *current_dev = "/dev/console";
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+static LIST_HEAD(struct console, consoles);
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+static int collect_consoles(void) {
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+ _cleanup_free_ char *active = NULL;
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+ const char *word, *state;
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+ struct console *con;
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+ size_t len;
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+ int ret, id = 0;
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+
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+ ret = read_one_line_file("/sys/class/tty/console/active", &active);
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+ if (ret < 0)
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+ return ret;
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+ FOREACH_WORD(word, len, active, state) {
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+ _cleanup_free_ char *tty = NULL;
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+
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+ if (strneq(word, "tty0", len) &&
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+ read_one_line_file("/sys/class/tty/tty0/active", &tty) >= 0) {
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+ word = tty;
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+ len = strlen(tty);
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+ }
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+ con = malloc0(sizeof(*con) + strlen("/dev/") + len + 1);
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+ if (con == NULL) {
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+ log_oom();
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+ continue;
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+ }
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+ sprintf(con->dev, "/dev/%.*s", (int)len, word);
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+ con->tty = con->dev;
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+ con->id = id++;
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+ LIST_PREPEND(handle, consoles, con);
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+ }
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+ if (consoles == NULL) {
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+ con = malloc0(sizeof(*con));
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+ if (con == NULL) {
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+ log_oom();
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+ return -ENOMEM;
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+ }
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+ con->tty = current_dev;
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+ con->id = id++;
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+ LIST_PREPEND(handle, consoles, con);
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+ }
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+ return 0;
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+}
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+
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+static void free_consoles(void) {
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+ struct console *c;
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+ LIST_FOREACH(handle, c, consoles) {
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+ LIST_REMOVE(handle, consoles, c);
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+ free(c);
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+ }
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+ LIST_HEAD_INIT(consoles);
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+}
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+
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static int parse_password(const char *filename, char **wall) {
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_cleanup_free_ char *socket_name = NULL, *message = NULL, *packet = NULL;
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uint64_t not_after = 0;
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@@ -311,7 +386,7 @@ static int parse_password(const char *fi
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_cleanup_free_ char *password = NULL;
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if (arg_console) {
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- tty_fd = acquire_terminal("/dev/console", false, false, false, USEC_INFINITY);
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+ tty_fd = acquire_terminal(current_dev, false, false, false, USEC_INFINITY);
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if (tty_fd < 0)
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return tty_fd;
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}
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@@ -615,9 +690,85 @@ static int parse_argv(int argc, char *ar
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return 1;
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}
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+static int zzz(void)
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+{
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+ struct console *con;
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+ struct sigaction sig = {
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+ .sa_handler = chld_handler,
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+ .sa_flags = SA_NOCLDSTOP | SA_RESTART,
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+ };
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+ struct sigaction oldsig;
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+ sigset_t set, oldset;
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+ int status = 0, ret;
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+ pid_t job;
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+
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+ collect_consoles();
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+ if (!consoles->handle_next) {
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+ consoles->pid = 0;
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+ con = consoles;
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+ goto nofork;
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+ }
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+
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+ assert_se(sigemptyset(&set) == 0);
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+ assert_se(sigaddset(&set, SIGHUP) == 0);
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+ assert_se(sigaddset(&set, SIGCHLD) == 0);
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+ assert_se(sigemptyset(&sig.sa_mask) == 0);
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+ assert_se(sigprocmask(SIG_UNBLOCK, &set, &oldset) == 0);
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+ assert_se(sigaction(SIGCHLD, &sig, &oldsig) == 0);
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+ sig.sa_handler = SIG_DFL;
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+ assert_se(sigaction(SIGHUP, &sig, NULL) == 0);
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+
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+ LIST_FOREACH(handle, con, consoles) {
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+ switch ((con->pid = fork())) {
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+ case 0:
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+ if (prctl(PR_SET_PDEATHSIG, SIGHUP) < 0)
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+ _exit(EXIT_FAILURE);
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+ zero(sig);
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+ assert_se(sigprocmask(SIG_UNBLOCK, &oldset, NULL) == 0);
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+ assert_se(sigaction(SIGCHLD, &oldsig, NULL) == 0);
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+ nofork:
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+ setsid();
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+ release_terminal();
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+ *usemask |= 1 << con->id;
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+ current_dev = con->tty;
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+ return con->id; /* child */
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+ case -1:
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+ log_error("Failed to query password: %s", strerror(errno));
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+ exit(EXIT_FAILURE);
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+ default:
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+ break;
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+ }
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+ }
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+
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+ ret = 0;
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+ while ((job = wait(&status)) != 0) {
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+ if (job < 0) {
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+ if (errno != EINTR)
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+ break;
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+ continue;
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+ }
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+ LIST_FOREACH(handle, con, consoles) {
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+ if (con->pid == job || kill(con->pid, 0) < 0) {
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+ *usemask &= ~(1 << con->id);
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+ continue;
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+ }
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+ if (*usemask & (1 << con->id))
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+ continue;
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+ kill(con->pid, SIGHUP);
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+ usleep(50000);
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+ kill(con->pid, SIGKILL);
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+ }
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+ if (WIFEXITED(status) && ret == 0)
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+ ret = WEXITSTATUS(status);
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+ }
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+ free_consoles();
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+ exit(ret != 0 ? EXIT_FAILURE : EXIT_SUCCESS); /* parent */
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+}
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+
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int main(int argc, char *argv[]) {
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- int r;
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+ int r, id = 0;
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+ LIST_HEAD_INIT(consoles);
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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@@ -628,11 +779,19 @@ int main(int argc, char *argv[]) {
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if (r <= 0)
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goto finish;
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+ usemask = mmap(NULL, sizeof(*usemask), PROT_READ | PROT_WRITE,
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+ MAP_ANONYMOUS | MAP_SHARED, -1, 0);
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+ assert_se(usemask != NULL);
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+
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if (arg_console) {
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- setsid();
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- release_terminal();
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+ if (!arg_plymouth && arg_action != ACTION_WALL &&
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+ arg_action != ACTION_LIST) {
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+ id = zzz();
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+ } else {
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+ setsid();
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+ release_terminal();
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+ }
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}
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-
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if (IN_SET(arg_action, ACTION_WATCH, ACTION_WALL))
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r = watch_passwords();
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else
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@@ -641,6 +800,8 @@ int main(int argc, char *argv[]) {
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if (r < 0)
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log_error_errno(r, "Error: %m");
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+ free_consoles();
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+ *usemask &= ~(1 << id);
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finish:
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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