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authorLennart Poettering <lennart@poettering.net>2010-08-17 03:29:46 +0200
committerLennart Poettering <lennart@poettering.net>2010-08-17 03:29:46 +0200
commit5192bd1945f59254b3d260ded15dd9f2b8cc2de7 (patch)
treec9496248fc004d866c40825d4abec9d97cb17b95 /src/auto-console-getty.c
parent16061c20ddd8eba9b9e1ef89149c51114a8084ce (diff)
auto-getty: rework auto console getty logic to work in conjunction with single user mode
Diffstat (limited to 'src/auto-console-getty.c')
-rw-r--r--src/auto-console-getty.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/src/auto-console-getty.c b/src/auto-console-getty.c
new file mode 100644
index 0000000000..44d2eff732
--- /dev/null
+++ b/src/auto-console-getty.c
@@ -0,0 +1,189 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include <dbus/dbus.h>
+
+#include "util.h"
+#include "log.h"
+#include "dbus-common.h"
+
+static int spawn_getty(DBusConnection *bus, const char *console) {
+ DBusMessage *m = NULL, *reply = NULL;
+ DBusError error;
+ const char *fail = "fail";
+ char *name;
+ int r = -EIO;
+
+ dbus_error_init(&error);
+
+ assert(bus);
+ assert(console);
+
+ /* FIXME: we probably should escape the tty name properly here */
+ if (asprintf(&name, "getty@%s.service", console) < 0)
+ return -ENOMEM;
+
+ if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit"))) {
+ log_error("Could not allocate message.");
+ goto finish;
+ }
+
+ if (!dbus_message_append_args(m,
+ DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_STRING, &fail,
+ DBUS_TYPE_INVALID)) {
+ log_error("Could not attach target and flag information to message.");
+ goto finish;
+ }
+
+ if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
+ log_error("Failed to start unit: %s", error.message);
+ goto finish;
+ }
+
+ r = 0;
+
+finish:
+ if (m)
+ dbus_message_unref(m);
+
+ if (reply)
+ dbus_message_unref(reply);
+
+ dbus_error_free(&error);
+
+ free(name);
+
+ return r;
+}
+
+static int parse_proc_cmdline_word(const char *word, char **console) {
+ assert(word);
+
+ if (startswith(word, "console=")) {
+ const char *k;
+ size_t l;
+ char *w = NULL;
+
+ k = word + 8;
+ l = strcspn(k, ",");
+
+ if (l < 4 ||
+ !startswith(k, "tty") ||
+ k[3+strspn(k+3, "0123456789")] != 0) {
+
+ if (!(w = strndup(k, l)))
+ return -ENOMEM;
+
+ }
+
+ free(*console);
+ *console = w;
+ }
+
+ return 0;
+}
+
+static int parse_proc_cmdline(char **console) {
+ char *line;
+ int r;
+ char *w;
+ size_t l;
+ char *state;
+
+ assert(console);
+
+ if ((r = read_one_line_file("/tmp/cmdline", &line)) < 0) {
+ log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
+ return 0;
+ }
+
+ FOREACH_WORD_QUOTED(w, l, line, state) {
+ char *word;
+
+ if (!(word = strndup(w, l))) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ r = parse_proc_cmdline_word(word, console);
+ free(word);
+
+ if (r < 0)
+ goto finish;
+ }
+
+ r = 0;
+
+finish:
+ free(line);
+ return r;
+}
+
+int main(int argc, char *argv[]) {
+ DBusError error;
+ int r = 1;
+ char *console = NULL;
+ DBusConnection *bus = NULL;
+
+ dbus_error_init(&error);
+
+ if (argc > 1) {
+ log_error("This program does not take arguments.");
+ return 1;
+ }
+
+ log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
+ log_parse_environment();
+ log_open();
+
+ if (bus_connect(DBUS_BUS_SYSTEM, &bus, NULL, &error) < 0) {
+ log_error("Failed to get D-Bus connection: %s", error.message);
+ goto finish;
+ }
+
+ if (parse_proc_cmdline(&console) < 0)
+ goto finish;
+
+ if (console)
+ if (spawn_getty(bus, console) < 0)
+ goto finish;
+
+ r = 0;
+
+finish:
+ free(console);
+
+ if (bus) {
+ dbus_connection_close(bus);
+ dbus_connection_unref(bus);
+ }
+
+ dbus_error_free(&error);
+
+ dbus_shutdown();
+
+ return r;
+}