/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2012 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <stdlib.h> #include <stdbool.h> #include <unistd.h> #include <getopt.h> #include <locale.h> #include <string.h> #include <sys/timex.h> #include <sys/utsname.h> #include "sd-bus.h" #include "bus-util.h" #include "bus-error.h" #include "util.h" #include "spawn-polkit-agent.h" #include "build.h" #include "hwclock.h" #include "strv.h" #include "sd-id128.h" #include "virt.h" #include "fileio.h" static bool arg_ask_password = true; static BusTransport arg_transport = BUS_TRANSPORT_LOCAL; static char *arg_host = NULL; static bool arg_transient = false; static bool arg_pretty = false; static bool arg_static = false; static void polkit_agent_open_if_enabled(void) { /* Open the polkit agent as a child process if necessary */ if (!arg_ask_password) return; if (arg_transport != BUS_TRANSPORT_LOCAL) return; polkit_agent_open(); } typedef struct StatusInfo { char *hostname; char *static_hostname; char *pretty_hostname; char *icon_name; char *chassis; } StatusInfo; static void print_status_info(StatusInfo *i) { sd_id128_t mid, bid; int r; const char *id = NULL; _cleanup_free_ char *pretty_name = NULL, *cpe_name = NULL; struct utsname u; assert(i); printf(" Static hostname: %s\n", strna(i->static_hostname)); if (!isempty(i->pretty_hostname) && !streq_ptr(i->pretty_hostname, i->static_hostname)) printf(" Pretty hostname: %s\n", strna(i->pretty_hostname)); if (!isempty(i->hostname) && !streq_ptr(i->hostname, i->static_hostname)) printf("Transient hostname: %s\n", strna(i->hostname)); printf(" Icon name: %s\n" " Chassis: %s\n", strna(i->icon_name), strna(i->chassis)); r = sd_id128_get_machine(&mid); if (r >= 0) printf(" Machine ID: " SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(mid)); r = sd_id128_get_boot(&bid); if (r >= 0) printf(" Boot ID: " SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(bid)); if (detect_virtualization(&id) > 0) printf(" Virtualization: %s\n", id); r = parse_env_file("/etc/os-release", NEWLINE, "PRETTY_NAME", &pretty_name, "CPE_NAME", &cpe_name, NULL); if (r < 0) log_warning("Failed to read /etc/os-release: %s", strerror(-r)); if (!isempty(pretty_name)) printf(" Operating System: %s\n", pretty_name); if (!isempty(cpe_name)) printf(" CPE OS Name: %s\n", cpe_name); assert_se(uname(&u) >= 0); printf(" Kernel: %s %s\n" " Architecture: %s\n", u.sysname, u.release, u.machine); } static int show_one_name(sd_bus *bus, const char* attr) { _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; const char *s; int r; r = sd_bus_get_property( bus, "org.freedesktop.hostname1", "/org/freedesktop/hostname1", "org.freedesktop.hostname1", attr, &error, &reply, "s"); if (r < 0) { log_error("Could not get property: %s", bus_error_message(&error, -r)); return r; } r = sd_bus_message_read(reply, "s", &s); if (r < 0) return bus_log_parse_error(r); printf("%s\n", s); return 0; } static int show_all_names(sd_bus *bus) { StatusInfo info = {}; static const struct bus_properties_map map[] = { { "Hostname", "s", NULL, offsetof(StatusInfo, hostname) }, { "StaticHostname", "s", NULL, offsetof(StatusInfo, static_hostname) }, { "PrettyHostname", "s", NULL, offsetof(StatusInfo, pretty_hostname) }, { "IconName", "s", NULL, offsetof(StatusInfo, icon_name) }, { "Chassis", "s", NULL, offsetof(StatusInfo, chassis) }, {} }; int r; r = bus_map_all_properties(bus, "org.freedesktop.hostname1", "/org/freedesktop/hostname1", map, &info); if (r < 0) goto fail; print_status_info(&info); fail: free(info.hostname); free(info.static_hostname); free(info.pretty_hostname); free(info.icon_name); free(info.chassis); return 0; } static int show_status(sd_bus *bus, char **args, unsigned n) { assert(args); if (arg_pretty || arg_static || arg_transient) { const char *attr; if (!!arg_static + !!arg_pretty + !!arg_transient > 1) { log_error("Cannot query more than one name type at a time"); return -EINVAL; } attr = arg_pretty ? "PrettyHostname" : arg_static ? "StaticHostname" : "Hostname"; return show_one_name(bus, attr); } else return show_all_names(bus); } static int set_simple_string(sd_bus *bus, const char *method, const char *value) { _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; int r = 0; polkit_agent_open_if_enabled(); r = sd_bus_call_method( bus, "org.freedesktop.hostname1", "/org/freedesktop/hostname1", "org.freedesktop.hostname1", method, &error, NULL, "sb", value, arg_ask_password); if (r < 0) log_error("Could not set property: %s", bus_error_message(&error, -r)); return r; } static int set_hostname(sd_bus *bus, char **args, unsigned n) { _cleanup_free_ char *h = NULL; const char *hostname = args[1]; int r; assert(args); assert(n == 2); if (!arg_pretty && !arg_static && !arg_transient) arg_pretty = arg_static = arg_transient = true; if (arg_pretty) { const char *p; /* If the passed hostname is already valid, then * assume the user doesn't know anything about pretty * hostnames, so let's unset the pretty hostname, and * just set the passed hostname as static/dynamic * hostname. */ h = strdup(hostname); if (!h) return log_oom(); hostname_cleanup(h, true); if (arg_static && streq(h, hostname)) p = ""; else { p = hostname; hostname = h; } r = set_simple_string(bus, "SetPrettyHostname", p); if (r < 0) return r; } if (arg_static) { r = set_simple_string(bus, "SetStaticHostname", hostname); if (r < 0) return r; } if (arg_transient) { r = set_simple_string(bus, "SetHostname", hostname); if (r < 0) return r; } return 0; } static int set_icon_name(sd_bus *bus, char **args, unsigned n) { assert(args); assert(n == 2); return set_simple_string(bus, "SetIconName", args[1]); } static int set_chassis(sd_bus *bus, char **args, unsigned n) { assert(args); assert(n == 2); return set_simple_string(bus, "SetChasis", args[1]); } static int help(void) { printf("%s [OPTIONS...] COMMAND ...\n\n" "Query or change system hostname.\n\n" " -h --help Show this help\n" " --version Show package version\n" " --transient Only set transient hostname\n" " --static Only set static hostname\n" " --pretty Only set pretty hostname\n" " --no-ask-password Do not prompt for password\n" " -H --host=[USER@]HOST Operate on remote host\n" " -M --machine=CONTAINER Operate on local container\n\n" "Commands:\n" " status Show current hostname settings\n" " set-hostname NAME Set system hostname\n" " set-icon-name NAME Set icon name for host\n" " set-chassis NAME Set chassis type for host\n", program_invocation_short_name); return 0; } static int parse_argv(int argc, char *argv[]) { enum { ARG_VERSION = 0x100, ARG_NO_ASK_PASSWORD, ARG_TRANSIENT, ARG_STATIC, ARG_PRETTY }; static const struct option options[] = { { "help", no_argument, NULL, 'h' }, { "version", no_argument, NULL, ARG_VERSION }, { "transient", no_argument, NULL, ARG_TRANSIENT }, { "static", no_argument, NULL, ARG_STATIC }, { "pretty", no_argument, NULL, ARG_PRETTY }, { "host", required_argument, NULL, 'H' }, { "machine", required_argument, NULL, 'M' }, { "no-ask-password", no_argument, NULL, ARG_NO_ASK_PASSWORD }, {} }; int c; assert(argc >= 0); assert(argv); while ((c = getopt_long(argc, argv, "hH:M:", options, NULL)) >= 0) { switch (c) { case 'h': return help(); case ARG_VERSION: puts(PACKAGE_STRING); puts(SYSTEMD_FEATURES); return 0; case 'H': arg_transport = BUS_TRANSPORT_REMOTE; arg_host = optarg; break; case 'M': arg_transport = BUS_TRANSPORT_CONTAINER; arg_host = optarg; break; case ARG_TRANSIENT: arg_transient = true; break; case ARG_PRETTY: arg_pretty = true; break; case ARG_STATIC: arg_static = true; break; case ARG_NO_ASK_PASSWORD: arg_ask_password = false; break; case '?': return -EINVAL; default: assert_not_reached("Unhandled option"); } } return 1; } static int hostnamectl_main(sd_bus *bus, int argc, char *argv[]) { static const struct { const char* verb; const enum { MORE, LESS, EQUAL } argc_cmp; const int argc; int (* const dispatch)(sd_bus *bus, char **args, unsigned n); } verbs[] = { { "status", LESS, 1, show_status }, { "set-hostname", EQUAL, 2, set_hostname }, { "set-icon-name", EQUAL, 2, set_icon_name }, { "set-chassis", EQUAL, 2, set_chassis }, }; int left; unsigned i; assert(argc >= 0); assert(argv); left = argc - optind; if (left <= 0) /* Special rule: no arguments means "status" */ i = 0; else { if (streq(argv[optind], "help")) { help(); return 0; } for (i = 0; i < ELEMENTSOF(verbs); i++) if (streq(argv[optind], verbs[i].verb)) break; if (i >= ELEMENTSOF(verbs)) { log_error("Unknown operation %s", argv[optind]); return -EINVAL; } } switch (verbs[i].argc_cmp) { case EQUAL: if (left != verbs[i].argc) { log_error("Invalid number of arguments."); return -EINVAL; } break; case MORE: if (left < verbs[i].argc) { log_error("Too few arguments."); return -EINVAL; } break; case LESS: if (left > verbs[i].argc) { log_error("Too many arguments."); return -EINVAL; } break; default: assert_not_reached("Unknown comparison operator."); } return verbs[i].dispatch(bus, argv + optind, left); } int main(int argc, char *argv[]) { _cleanup_bus_unref_ sd_bus *bus = NULL; int r; setlocale(LC_ALL, ""); log_parse_environment(); log_open(); r = parse_argv(argc, argv); if (r <= 0) goto finish; r = bus_open_transport(arg_transport, arg_host, false, &bus); if (r < 0) { log_error("Failed to create bus connection: %s", strerror(-r)); goto finish; } r = hostnamectl_main(bus, argc, argv); finish: return r < 0 ? EXIT_FAILURE : r; }