| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2011 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 <dlfcn.h> |
| |
| #include "util.h" |
| #include "strv.h" |
| #include "dbus-common.h" |
| #include "polkit.h" |
| |
| #define INTERFACE \ |
| " <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" |
| |
| #define INTROSPECTION \ |
| DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE \ |
| "<node>\n" \ |
| INTERFACE \ |
| BUS_PROPERTIES_INTERFACE \ |
| BUS_INTROSPECTABLE_INTERFACE \ |
| BUS_PEER_INTERFACE \ |
| "</node>\n" |
| |
| #define INTERFACES_LIST \ |
| BUS_GENERIC_INTERFACES_LIST \ |
| "org.freedesktop.hostname1\0" |
| |
| const char hostname_interface[] _introspect_("hostname1") = INTERFACE; |
| |
| 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 bool check_nss(void) { |
| |
| void *dl; |
| |
| if ((dl = dlopen("libnss_myhostname.so.2", RTLD_LAZY))) { |
| dlclose(dl); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| 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. |
| |
| See the SMBIOS Specification 2.7.1 section 7.4.1 for |
| details about the values listed here: |
| |
| http://www.dmtf.org/sites/default/files/standards/documents/DSP0134_2.7.1.pdf |
| */ |
| |
| switch (t) { |
| |
| case 0x3: |
| case 0x4: |
| case 0x6: |
| case 0x7: |
| return "computer-desktop"; |
| |
| case 0x9: |
| case 0xA: |
| case 0xE: |
| return "computer-laptop"; |
| |
| case 0x11: |
| case 0x1C: |
| 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_atomic("/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; |
| } |
| |
| 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) { |
| log_error("Failed to set host name: %s", strerror(-r)); |
| return bus_send_error_reply(connection, message, NULL, r); |
| } |
| |
| log_info("Changed host name to '%s'", strempty(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) { |
| log_error("Failed to write static host name: %s", strerror(-r)); |
| return bus_send_error_reply(connection, message, NULL, r); |
| } |
| |
| log_info("Changed static host name to '%s'", strempty(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])) { |
| |
| /* Since the pretty hostname should always be |
| * changed at the same time as the static one, |
| * use the same policy action for both... */ |
| |
| r = verify_polkit(connection, message, k == PROP_PRETTY_HOSTNAME ? |
| "org.freedesktop.hostname1.set-static-hostname" : |
| "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) { |
| log_error("Failed to write machine info: %s", strerror(-r)); |
| return bus_send_error_reply(connection, message, NULL, r); |
| } |
| |
| log_info("Changed %s to '%s'", k == PROP_PRETTY_HOSTNAME ? "pretty host name" : "icon name", strempty(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; |
| } |
| |
| static int connect_bus(DBusConnection **_bus) { |
| static const DBusObjectPathVTable hostname_vtable = { |
| .message_function = hostname_message_handler |
| }; |
| DBusError error; |
| DBusConnection *bus = NULL; |
| int r; |
| |
| assert(_bus); |
| |
| dbus_error_init(&error); |
| |
| bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error); |
| if (!bus) { |
| log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error)); |
| r = -ECONNREFUSED; |
| goto fail; |
| } |
| |
| if (!dbus_connection_register_object_path(bus, "/org/freedesktop/hostname1", &hostname_vtable, NULL)) { |
| log_error("Not enough memory"); |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| r = dbus_bus_request_name(bus, "org.freedesktop.hostname1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error); |
| if (dbus_error_is_set(&error)) { |
| log_error("Failed to register name on bus: %s", bus_error_message(&error)); |
| r = -EEXIST; |
| goto fail; |
| } |
| |
| if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) { |
| log_error("Failed to acquire name."); |
| r = -EEXIST; |
| goto fail; |
| } |
| |
| if (_bus) |
| *_bus = bus; |
| |
| return 0; |
| |
| fail: |
| dbus_connection_close(bus); |
| dbus_connection_unref(bus); |
| |
| dbus_error_free(&error); |
| |
| return r; |
| } |
| |
| int main(int argc, char *argv[]) { |
| int r; |
| DBusConnection *bus = NULL; |
| |
| log_set_target(LOG_TARGET_AUTO); |
| log_parse_environment(); |
| log_open(); |
| |
| if (argc == 2 && streq(argv[1], "--introspect")) { |
| fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE |
| "<node>\n", stdout); |
| fputs(hostname_interface, stdout); |
| fputs("</node>\n", stdout); |
| return 0; |
| } |
| |
| if (argc != 1) { |
| log_error("This program takes no arguments."); |
| r = -EINVAL; |
| goto finish; |
| } |
| |
| if (!check_nss()) |
| log_warning("Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!"); |
| |
| umask(0022); |
| |
| r = read_data(); |
| if (r < 0) { |
| log_error("Failed to read hostname data: %s", strerror(-r)); |
| goto finish; |
| } |
| |
| r = connect_bus(&bus); |
| if (r < 0) |
| 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); |
| } |
| |
| return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
| } |