summaryrefslogtreecommitdiff
path: root/src/hostnamed.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/hostnamed.c')
-rw-r--r--src/hostnamed.c689
1 files changed, 689 insertions, 0 deletions
diff --git a/src/hostnamed.c b/src/hostnamed.c
new file mode 100644
index 000000000..4ba1d4a57
--- /dev/null
+++ b/src/hostnamed.c
@@ -0,0 +1,689 @@
+/*-*- 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 <dbus/dbus.h>
+
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "util.h"
+#include "strv.h"
+#include "dbus-common.h"
+
+#define INTROSPECTION \
+ DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE \
+ "<node>\n" \
+ " <interface name=\"org.freedesktop.hostname1\">\n" \
+ " <property name=\"Hostname\" type=\"s\" access=\"read\"/>\n" \
+ " <property name=\"StaticHostname\" type=\"s\" access=\"read\"/>\n" \
+ " <property name=\"PrettyHostname\" type=\"s\" access=\"read\"/>\n" \
+ " <property name=\"IconName\" type=\"s\" access=\"read\"/>\n" \
+ " <method name=\"SetHostname\">\n" \
+ " <arg name=\"name\" type=\"s\" direction=\"in\"/>\n" \
+ " <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
+ " </method>\n" \
+ " <method name=\"SetStaticHostname\">\n" \
+ " <arg name=\"name\" type=\"s\" direction=\"in\"/>\n" \
+ " <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
+ " </method>\n" \
+ " <method name=\"SetPrettyHostname\">\n" \
+ " <arg name=\"name\" type=\"s\" direction=\"in\"/>\n" \
+ " <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
+ " </method>\n" \
+ " <method name=\"SetIconName\">\n" \
+ " <arg name=\"name\" type=\"s\" direction=\"in\"/>\n" \
+ " <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
+ " </method>\n" \
+ " </interface>\n" \
+ BUS_PROPERTIES_INTERFACE \
+ BUS_INTROSPECTABLE_INTERFACE \
+ BUS_PEER_INTERFACE \
+ "</node>\n"
+
+#define INTERFACES_LIST \
+ BUS_GENERIC_INTERFACES_LIST \
+ "org.freedesktop.hostname1\0"
+
+enum {
+ PROP_HOSTNAME,
+ PROP_STATIC_HOSTNAME,
+ PROP_PRETTY_HOSTNAME,
+ PROP_ICON_NAME,
+ _PROP_MAX
+};
+
+static char *data[_PROP_MAX] = {
+ NULL,
+ NULL,
+ NULL,
+ NULL
+};
+
+static void free_data(void) {
+ int p;
+
+ for (p = 0; p < _PROP_MAX; p++) {
+ free(data[p]);
+ data[p] = NULL;
+ }
+}
+
+static int read_data(void) {
+ int r;
+
+ free_data();
+
+ data[PROP_HOSTNAME] = gethostname_malloc();
+ if (!data[PROP_HOSTNAME])
+ return -ENOMEM;
+
+ r = read_one_line_file("/etc/hostname", &data[PROP_STATIC_HOSTNAME]);
+ if (r < 0 && r != -ENOENT)
+ return r;
+
+ r = parse_env_file("/etc/machine-info", NEWLINE,
+ "PRETTY_HOSTNAME", &data[PROP_PRETTY_HOSTNAME],
+ "ICON_NAME", &data[PROP_ICON_NAME],
+ NULL);
+ if (r < 0 && r != -ENOENT)
+ return r;
+
+ return 0;
+}
+
+static const char* fallback_icon_name(void) {
+
+#if defined(__i386__) || defined(__x86_64__)
+ int r;
+ char *type;
+ unsigned t;
+#endif
+
+ if (detect_virtualization(NULL) > 0)
+ return "computer-vm";
+
+#if defined(__i386__) || defined(__x86_64__)
+ r = read_one_line_file("/sys/class/dmi/id/chassis_type", &type);
+ if (r < 0)
+ return NULL;
+
+ r = safe_atou(type, &t);
+ free(type);
+
+ if (r < 0)
+ return NULL;
+
+ /* We only list the really obvious cases here. The DMI data is
+ unreliable enough, so let's not do any additional guesswork
+ on top of that. */
+
+ switch (t) {
+
+ case 0x3:
+ case 0x4:
+ case 0x6:
+ case 0x7:
+ return "computer-desktop";
+
+ case 0x9:
+ case 0xA:
+ case 0xE:
+ return "computer-laptop";
+
+ case 0x11:
+ return "computer-server";
+ }
+
+#endif
+ return NULL;
+}
+
+static int write_data_hostname(void) {
+ const char *hn;
+
+ if (isempty(data[PROP_HOSTNAME]))
+ hn = "localhost";
+ else
+ hn = data[PROP_HOSTNAME];
+
+ if (sethostname(hn, strlen(hn)) < 0)
+ return -errno;
+
+ return 0;
+}
+
+static int write_data_static_hostname(void) {
+
+ if (isempty(data[PROP_STATIC_HOSTNAME])) {
+
+ if (unlink("/etc/hostname") < 0)
+ return errno == ENOENT ? 0 : -errno;
+
+ return 0;
+ }
+
+ return write_one_line_file("/etc/hostname", data[PROP_STATIC_HOSTNAME]);
+}
+
+static int write_data_other(void) {
+ static const char * const name[_PROP_MAX] = {
+ [PROP_PRETTY_HOSTNAME] = "PRETTY_HOSTNAME",
+ [PROP_ICON_NAME] = "ICON_NAME"
+ };
+
+ char **l = NULL;
+ int r, p;
+
+ r = load_env_file("/etc/machine-info", &l);
+ if (r < 0 && r != -ENOENT)
+ return r;
+
+ for (p = 2; p < _PROP_MAX; p++) {
+ char *t, **u;
+
+ assert(name[p]);
+
+ if (isempty(data[p])) {
+ l = strv_env_unset(l, name[p]);
+ continue;
+ }
+
+ if (asprintf(&t, "%s=%s", name[p], strempty(data[p])) < 0) {
+ strv_free(l);
+ return -ENOMEM;
+ }
+
+ u = strv_env_set(l, t);
+ free(t);
+ strv_free(l);
+
+ if (!u)
+ return -ENOMEM;
+ l = u;
+ }
+
+ if (strv_isempty(l)) {
+
+ if (unlink("/etc/machine-info") < 0)
+ return errno == ENOENT ? 0 : -errno;
+
+ return 0;
+ }
+
+ r = write_env_file("/etc/machine-info", l);
+ strv_free(l);
+
+ return r;
+}
+
+/* This mimics dbus_bus_get_unix_user() */
+static pid_t get_unix_process_id(
+ DBusConnection *connection,
+ const char *name,
+ DBusError *error) {
+
+ DBusMessage *m = NULL, *reply = NULL;
+ uint32_t pid = 0;
+
+ m = dbus_message_new_method_call(
+ DBUS_SERVICE_DBUS,
+ DBUS_PATH_DBUS,
+ DBUS_INTERFACE_DBUS,
+ "GetConnectionUnixProcessID");
+ if (!m) {
+ dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, NULL);
+ goto finish;
+ }
+
+ if (!dbus_message_append_args(
+ m,
+ DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_INVALID)) {
+ dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, NULL);
+ goto finish;
+ }
+
+ reply = dbus_connection_send_with_reply_and_block(connection, m, -1, error);
+ if (!reply)
+ goto finish;
+
+ if (dbus_set_error_from_message(error, reply))
+ goto finish;
+
+ if (!dbus_message_get_args(
+ reply, error,
+ DBUS_TYPE_UINT32, &pid,
+ DBUS_TYPE_INVALID))
+ goto finish;
+
+finish:
+ if (m)
+ dbus_message_unref(m);
+
+ if (reply)
+ dbus_message_unref(reply);
+
+ return (pid_t) pid;
+}
+
+static int verify_polkit(
+ DBusConnection *c,
+ DBusMessage *request,
+ const char *action,
+ bool interactive,
+ DBusError *error) {
+
+ DBusMessage *m = NULL, *reply = NULL;
+ const char *unix_process = "unix-process", *pid = "pid", *starttime = "start-time", *cancel_id = "";
+ const char *sender;
+ uint32_t flags = interactive ? 1 : 0;
+ pid_t pid_raw;
+ uint32_t pid_u32;
+ unsigned long long starttime_raw;
+ uint64_t starttime_u64;
+ DBusMessageIter iter_msg, iter_struct, iter_array, iter_dict, iter_variant;
+ int r;
+ dbus_bool_t authorized = FALSE;
+
+ assert(c);
+ assert(request);
+
+ sender = dbus_message_get_sender(request);
+ if (!sender)
+ return -EINVAL;
+
+ pid_raw = get_unix_process_id(c, sender, error);
+ if (pid_raw == 0)
+ return -EINVAL;
+
+ r = get_starttime_of_pid(pid_raw, &starttime_raw);
+ if (r < 0)
+ return r;
+
+ m = dbus_message_new_method_call(
+ "org.freedesktop.PolicyKit1",
+ "/org/freedesktop/PolicyKit1/Authority",
+ "org.freedesktop.PolicyKit1.Authority",
+ "CheckAuthorization");
+ if (!m)
+ return -ENOMEM;
+
+ dbus_message_iter_init_append(m, &iter_msg);
+
+ pid_u32 = (uint32_t) pid_raw;
+ starttime_u64 = (uint64_t) starttime_raw;
+
+ if (!dbus_message_iter_open_container(&iter_msg, DBUS_TYPE_STRUCT, NULL, &iter_struct) ||
+ !dbus_message_iter_append_basic(&iter_struct, DBUS_TYPE_STRING, &unix_process) ||
+ !dbus_message_iter_open_container(&iter_struct, DBUS_TYPE_ARRAY, "{sv}", &iter_array) ||
+ !dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) ||
+ !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &pid) ||
+ !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "u", &iter_variant) ||
+ !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT32, &pid_u32) ||
+ !dbus_message_iter_close_container(&iter_dict, &iter_variant) ||
+ !dbus_message_iter_close_container(&iter_array, &iter_dict) ||
+ !dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) ||
+ !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &starttime) ||
+ !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "t", &iter_variant) ||
+ !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT64, &starttime_u64) ||
+ !dbus_message_iter_close_container(&iter_dict, &iter_variant) ||
+ !dbus_message_iter_close_container(&iter_array, &iter_dict) ||
+ !dbus_message_iter_close_container(&iter_struct, &iter_array) ||
+ !dbus_message_iter_close_container(&iter_msg, &iter_struct) ||
+ !dbus_message_iter_append_basic(&iter_msg, DBUS_TYPE_STRING, &action) ||
+ !dbus_message_iter_open_container(&iter_msg, DBUS_TYPE_ARRAY, "{ss}", &iter_array) ||
+ !dbus_message_iter_close_container(&iter_msg, &iter_array) ||
+ !dbus_message_iter_append_basic(&iter_msg, DBUS_TYPE_UINT32, &flags) ||
+ !dbus_message_iter_append_basic(&iter_msg, DBUS_TYPE_STRING, &cancel_id)) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ reply = dbus_connection_send_with_reply_and_block(c, m, -1, error);
+ if (!reply) {
+ r = -EIO;
+ goto finish;
+ }
+
+ if (dbus_set_error_from_message(error, reply)) {
+ r = -EIO;
+ goto finish;
+ }
+
+ if (!dbus_message_iter_init(reply, &iter_msg) ||
+ dbus_message_iter_get_arg_type(&iter_msg) != DBUS_TYPE_STRUCT) {
+ r = -EIO;
+ goto finish;
+ }
+
+ dbus_message_iter_recurse(&iter_msg, &iter_struct);
+
+ if (dbus_message_iter_get_arg_type(&iter_struct) != DBUS_TYPE_BOOLEAN) {
+ r = -EIO;
+ goto finish;
+ }
+
+ dbus_message_iter_get_basic(&iter_struct, &authorized);
+
+ r = authorized ? 0 : -EPERM;
+
+finish:
+
+ if (m)
+ dbus_message_unref(m);
+
+ if (reply)
+ dbus_message_unref(reply);
+
+ return r;
+}
+
+static int bus_hostname_append_icon_name(DBusMessageIter *i, const char *property, void *userdata) {
+ const char *name;
+
+ assert(i);
+ assert(property);
+
+ if (isempty(data[PROP_ICON_NAME]))
+ name = fallback_icon_name();
+ else
+ name = data[PROP_ICON_NAME];
+
+ return bus_property_append_string(i, property, (void*) name);
+}
+
+static DBusHandlerResult hostname_message_handler(
+ DBusConnection *connection,
+ DBusMessage *message,
+ void *userdata) {
+
+ const BusProperty properties[] = {
+ { "org.freedesktop.hostname1", "Hostname", bus_property_append_string, "s", data[PROP_HOSTNAME]},
+ { "org.freedesktop.hostname1", "StaticHostname", bus_property_append_string, "s", data[PROP_STATIC_HOSTNAME]},
+ { "org.freedesktop.hostname1", "PrettyHostname", bus_property_append_string, "s", data[PROP_PRETTY_HOSTNAME]},
+ { "org.freedesktop.hostname1", "IconName", bus_hostname_append_icon_name, "s", data[PROP_ICON_NAME]},
+ { NULL, NULL, NULL, NULL, NULL }
+ };
+
+ DBusMessage *reply = NULL, *changed = NULL;
+ DBusError error;
+ int r;
+
+ assert(connection);
+ assert(message);
+
+ dbus_error_init(&error);
+
+ if (dbus_message_is_method_call(message, "org.freedesktop.hostname1", "SetHostname")) {
+ const char *name;
+ dbus_bool_t interactive;
+
+ if (!dbus_message_get_args(
+ message,
+ &error,
+ DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_BOOLEAN, &interactive,
+ DBUS_TYPE_INVALID))
+ return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+ if (isempty(name))
+ name = data[PROP_STATIC_HOSTNAME];
+
+ if (isempty(name))
+ name = "localhost";
+
+ if (!hostname_is_valid(name))
+ return bus_send_error_reply(connection, message, NULL, -EINVAL);
+
+ if (!streq_ptr(name, data[PROP_HOSTNAME])) {
+ char *h;
+
+ r = verify_polkit(connection, message, "org.freedesktop.hostname1.set-hostname", interactive, &error);
+ if (r < 0)
+ return bus_send_error_reply(connection, message, &error, r);
+
+ h = strdup(name);
+ if (!h)
+ goto oom;
+
+ free(data[PROP_HOSTNAME]);
+ data[PROP_HOSTNAME] = h;
+
+ r = write_data_hostname();
+ if (r < 0)
+ return bus_send_error_reply(connection, message, NULL, r);
+
+ log_info("Changed host name to '%s'", data[PROP_HOSTNAME]);
+
+ changed = bus_properties_changed_new(
+ "/org/freedesktop/hostname1",
+ "org.freedesktop.hostname1",
+ "Hostname\0");
+ if (!changed)
+ goto oom;
+ }
+
+ } else if (dbus_message_is_method_call(message, "org.freedesktop.hostname1", "SetStaticHostname")) {
+ const char *name;
+ dbus_bool_t interactive;
+
+ if (!dbus_message_get_args(
+ message,
+ &error,
+ DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_BOOLEAN, &interactive,
+ DBUS_TYPE_INVALID))
+ return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+ if (isempty(name))
+ name = NULL;
+
+ if (!streq_ptr(name, data[PROP_STATIC_HOSTNAME])) {
+
+ r = verify_polkit(connection, message, "org.freedesktop.hostname1.set-static-hostname", interactive, &error);
+ if (r < 0)
+ return bus_send_error_reply(connection, message, &error, r);
+
+ if (isempty(name)) {
+ free(data[PROP_STATIC_HOSTNAME]);
+ data[PROP_STATIC_HOSTNAME] = NULL;
+ } else {
+ char *h;
+
+ if (!hostname_is_valid(name))
+ return bus_send_error_reply(connection, message, NULL, -EINVAL);
+
+ h = strdup(name);
+ if (!h)
+ goto oom;
+
+ free(data[PROP_STATIC_HOSTNAME]);
+ data[PROP_STATIC_HOSTNAME] = h;
+ }
+
+ r = write_data_static_hostname();
+ if (r < 0)
+ return bus_send_error_reply(connection, message, NULL, r);
+
+ log_info("Changed static host name to '%s'", data[PROP_HOSTNAME]);
+
+ changed = bus_properties_changed_new(
+ "/org/freedesktop/hostname1",
+ "org.freedesktop.hostname1",
+ "StaticHostname\0");
+ if (!changed)
+ goto oom;
+ }
+
+ } else if (dbus_message_is_method_call(message, "org.freedesktop.hostname1", "SetPrettyHostname") ||
+ dbus_message_is_method_call(message, "org.freedesktop.hostname1", "SetIconName")) {
+
+ const char *name;
+ dbus_bool_t interactive;
+ int k;
+
+ if (!dbus_message_get_args(
+ message,
+ &error,
+ DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_BOOLEAN, &interactive,
+ DBUS_TYPE_INVALID))
+ return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+ if (isempty(name))
+ name = NULL;
+
+ k = streq(dbus_message_get_member(message), "SetPrettyHostname") ? PROP_PRETTY_HOSTNAME : PROP_ICON_NAME;
+
+ if (!streq_ptr(name, data[k])) {
+
+ r = verify_polkit(connection, message, "org.freedesktop.hostname1.set-machine-info", interactive, &error);
+ if (r < 0)
+ return bus_send_error_reply(connection, message, &error, r);
+
+ if (isempty(name)) {
+ free(data[k]);
+ data[k] = NULL;
+ } else {
+ char *h;
+
+ h = strdup(name);
+ if (!h)
+ goto oom;
+
+ free(data[k]);
+ data[k] = h;
+ }
+
+ r = write_data_other();
+ if (r < 0)
+ return bus_send_error_reply(connection, message, NULL, r);
+
+ log_info("Changed %s to '%s'", k == PROP_PRETTY_HOSTNAME ? "pretty host name" : "icon name", data[k]);
+
+ changed = bus_properties_changed_new(
+ "/org/freedesktop/hostname1",
+ "org.freedesktop.hostname1",
+ k == PROP_PRETTY_HOSTNAME ? "PrettyHostname\0" : "IconName\0");
+ if (!changed)
+ goto oom;
+ }
+
+ } else
+ return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties);
+
+ if (!(reply = dbus_message_new_method_return(message)))
+ goto oom;
+
+ if (!dbus_connection_send(connection, reply, NULL))
+ goto oom;
+
+ dbus_message_unref(reply);
+ reply = NULL;
+
+ if (changed) {
+
+ if (!dbus_connection_send(connection, changed, NULL))
+ goto oom;
+
+ dbus_message_unref(changed);
+ }
+
+ return DBUS_HANDLER_RESULT_HANDLED;
+
+oom:
+ if (reply)
+ dbus_message_unref(reply);
+
+ if (changed)
+ dbus_message_unref(changed);
+
+ dbus_error_free(&error);
+
+ return DBUS_HANDLER_RESULT_NEED_MEMORY;
+}
+
+int main(int argc, char *argv[]) {
+ const DBusObjectPathVTable hostname_vtable = {
+ .message_function = hostname_message_handler
+ };
+
+ DBusConnection *bus = NULL;
+ DBusError error;
+ int r;
+
+ dbus_error_init(&error);
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
+
+ if (argc != 1) {
+ log_error("This program takes no arguments.");
+ r = -EINVAL;
+ goto finish;
+ }
+
+ umask(0022);
+
+ r = read_data();
+ if (r < 0) {
+ log_error("Failed to read hostname data: %s", strerror(-r));
+ goto finish;
+ }
+
+ bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
+ if (!bus) {
+ log_error("Failed to get system D-Bus connection: %s", error.message);
+ r = -ECONNREFUSED;
+ goto finish;
+ }
+
+ if (!dbus_connection_register_object_path(bus, "/org/freedesktop/hostname1", &hostname_vtable, NULL)) {
+ log_error("Not enough memory");
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if (dbus_bus_request_name(bus, "org.freedesktop.hostname1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error) < 0) {
+ log_error("Failed to register name on bus: %s", error.message);
+ goto finish;
+ }
+
+ while (dbus_connection_read_write_dispatch(bus, -1))
+ ;
+
+ r = 0;
+
+finish:
+ free_data();
+
+ if (bus) {
+ dbus_connection_flush(bus);
+ dbus_connection_close(bus);
+ dbus_connection_unref(bus);
+ }
+
+ dbus_error_free(&error);
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-03 07:32:41 +0000