/*-*- 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 <locale.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <getopt.h>
#include <string.h>
#include <ftw.h>
#include <sys/mman.h>
#include <fcntl.h>

#include "dbus-common.h"
#include "util.h"
#include "spawn-polkit-agent.h"
#include "build.h"
#include "strv.h"
#include "pager.h"
#include "set.h"
#include "path-util.h"

static bool arg_no_pager = false;
static enum transport {
        TRANSPORT_NORMAL,
        TRANSPORT_SSH,
        TRANSPORT_POLKIT
} arg_transport = TRANSPORT_NORMAL;
static bool arg_ask_password = true;
static const char *arg_host = NULL;
static bool arg_convert = true;

static void pager_open_if_enabled(void) {

        if (arg_no_pager)
                return;

        pager_open();
}

static void polkit_agent_open_if_enabled(void) {

        /* Open the polkit agent as a child process if necessary */

        if (!arg_ask_password)
                return;

        polkit_agent_open();
}

typedef struct StatusInfo {
        char **locale;
        const char *vconsole_keymap;
        const char *vconsole_keymap_toggle;
        const char *x11_layout;
        const char *x11_model;
        const char *x11_variant;
        const char *x11_options;
} StatusInfo;

static void print_status_info(StatusInfo *i) {
        assert(i);

        if (strv_isempty(i->locale))
                puts("   System Locale: n/a\n");
        else {
                char **j;

                printf("   System Locale: %s\n", i->locale[0]);
                STRV_FOREACH(j, i->locale + 1)
                        printf("                  %s\n", *j);
        }

        printf("       VC Keymap: %s\n", strna(i->vconsole_keymap));
        if (!isempty(i->vconsole_keymap_toggle))
                printf("VC Toggle Keymap: %s\n", i->vconsole_keymap_toggle);

        printf("      X11 Layout: %s\n", strna(i->x11_layout));
        if (!isempty(i->x11_model))
                printf("       X11 Model: %s\n", i->x11_model);
        if (!isempty(i->x11_variant))
                printf("     X11 Variant: %s\n", i->x11_variant);
        if (!isempty(i->x11_options))
                printf("     X11 Options: %s\n", i->x11_options);
}

static int status_property(const char *name, DBusMessageIter *iter, StatusInfo *i) {
        int r;

        assert(name);
        assert(iter);

        switch (dbus_message_iter_get_arg_type(iter)) {

        case DBUS_TYPE_STRING: {
                const char *s;

                dbus_message_iter_get_basic(iter, &s);
                if (!isempty(s)) {
                        if (streq(name, "VConsoleKeymap"))
                                i->vconsole_keymap = s;
                        else if (streq(name, "VConsoleKeymapToggle"))
                                i->vconsole_keymap_toggle = s;
                        else if (streq(name, "X11Layout"))
                                i->x11_layout = s;
                        else if (streq(name, "X11Model"))
                                i->x11_model = s;
                        else if (streq(name, "X11Variant"))
                                i->x11_variant = s;
                        else if (streq(name, "X11Options"))
                                i->x11_options = s;
                }
                break;
        }

        case DBUS_TYPE_ARRAY:

                if (dbus_message_iter_get_element_type(iter) == DBUS_TYPE_STRING) {
                        char **l;

                        r = bus_parse_strv_iter(iter, &l);
                        if (r < 0)
                                return r;

                        if (streq(name, "Locale")) {
                                strv_free(i->locale);
                                i->locale = l;
                                l = NULL;
                        }

                        strv_free(l);
                }
        }

        return 0;
}

static int show_status(DBusConnection *bus, char **args, unsigned n) {
        _cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
        const char *interface = "";
        int r;
        DBusMessageIter iter, sub, sub2, sub3;
        StatusInfo info;

        assert(args);

        r = bus_method_call_with_reply(
                        bus,
                        "org.freedesktop.locale1",
                        "/org/freedesktop/locale1",
                        "org.freedesktop.DBus.Properties",
                        "GetAll",
                        &reply,
                        NULL,
                        DBUS_TYPE_STRING, &interface,
                        DBUS_TYPE_INVALID);
        if (r < 0)
                return r;

        if (!dbus_message_iter_init(reply, &iter) ||
            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
            dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_DICT_ENTRY)  {
                log_error("Failed to parse reply.");
                return -EIO;
        }

        zero(info);
        dbus_message_iter_recurse(&iter, &sub);

        while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
                const char *name;

                if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_DICT_ENTRY) {
                        log_error("Failed to parse reply.");
                        return -EIO;
                }

                dbus_message_iter_recurse(&sub, &sub2);

                if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &name, true) < 0) {
                        log_error("Failed to parse reply.");
                        return -EIO;
                }

                if (dbus_message_iter_get_arg_type(&sub2) != DBUS_TYPE_VARIANT)  {
                        log_error("Failed to parse reply.");
                        return -EIO;
                }

                dbus_message_iter_recurse(&sub2, &sub3);

                r = status_property(name, &sub3, &info);
                if (r < 0) {
                        log_error("Failed to parse reply.");
                        return r;
                }

                dbus_message_iter_next(&sub);
        }

        print_status_info(&info);
        strv_free(info.locale);
        return 0;
}

static int set_locale(DBusConnection *bus, char **args, unsigned n) {
        _cleanup_dbus_message_unref_ DBusMessage *m = NULL, *reply = NULL;
        dbus_bool_t interactive = true;
        DBusError error;
        DBusMessageIter iter;
        int r;

        assert(bus);
        assert(args);

        dbus_error_init(&error);

        polkit_agent_open_if_enabled();

        m = dbus_message_new_method_call(
                        "org.freedesktop.locale1",
                        "/org/freedesktop/locale1",
                        "org.freedesktop.locale1",
                        "SetLocale");
        if (!m)
                return log_oom();

        dbus_message_iter_init_append(m, &iter);

        r = bus_append_strv_iter(&iter, args + 1);
        if (r < 0)
                return log_oom();

        if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_BOOLEAN, &interactive))
                return log_oom();

        reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
        if (!reply) {
                log_error("Failed to issue method call: %s", bus_error_message(&error));
                r = -EIO;
                goto finish;
        }

        r = 0;

finish:
        dbus_error_free(&error);
        return r;
}

static int add_locales_from_archive(Set *locales) {
        /* Stolen from glibc... */

        struct locarhead {
                uint32_t magic;
                /* Serial number.  */
                uint32_t serial;
                /* Name hash table.  */
                uint32_t namehash_offset;
                uint32_t namehash_used;
                uint32_t namehash_size;
                /* String table.  */
                uint32_t string_offset;
                uint32_t string_used;
                uint32_t string_size;
                /* Table with locale records.  */
                uint32_t locrectab_offset;
                uint32_t locrectab_used;
                uint32_t locrectab_size;
                /* MD5 sum hash table.  */
                uint32_t sumhash_offset;
                uint32_t sumhash_used;
                uint32_t sumhash_size;
        };

        struct namehashent {
                /* Hash value of the name.  */
                uint32_t hashval;
                /* Offset of the name in the string table.  */
                uint32_t name_offset;
                /* Offset of the locale record.  */
                uint32_t locrec_offset;
        };

        const struct locarhead *h;
        const struct namehashent *e;
        const void *p = MAP_FAILED;
        _cleanup_close_ int fd = -1;
        size_t sz = 0;
        struct stat st;
        unsigned i;
        int r;

        fd = open("/usr/lib/locale/locale-archive", O_RDONLY|O_NOCTTY|O_CLOEXEC);
        if (fd < 0) {
                if (errno != ENOENT)
                        log_error("Failed to open locale archive: %m");
                r = -errno;
                goto finish;
        }

        if (fstat(fd, &st) < 0) {
                log_error("fstat() failed: %m");
                r = -errno;
                goto finish;
        }

        if (!S_ISREG(st.st_mode)) {
                log_error("Archive file is not regular");
                r = -EBADMSG;
                goto finish;
        }

        if (st.st_size < (off_t) sizeof(struct locarhead)) {
                log_error("Archive has invalid size");
                r = -EBADMSG;
                goto finish;
        }

        p = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
        if (p == MAP_FAILED) {
                log_error("Failed to map archive: %m");
                r = -errno;
                goto finish;
        }

        h = (const struct locarhead *) p;
        if (h->magic != 0xde020109 ||
            h->namehash_offset + h->namehash_size > st.st_size ||
            h->string_offset + h->string_size > st.st_size ||
            h->locrectab_offset + h->locrectab_size > st.st_size ||
            h->sumhash_offset + h->sumhash_size > st.st_size) {
                log_error("Invalid archive file.");
                r = -EBADMSG;
                goto finish;
        }

        e = (const struct namehashent*) ((const uint8_t*) p + h->namehash_offset);
        for (i = 0; i < h->namehash_size; i++) {
                char *z;

                if (e[i].locrec_offset == 0)
                        continue;

                z = strdup((char*) p + e[i].name_offset);
                if (!z) {
                        r = log_oom();
                        goto finish;
                }

                r = set_put(locales, z);
                if (r < 0) {
                        free(z);
                        log_error("Failed to add locale: %s", strerror(-r));
                        goto finish;
                }
        }

        r = 0;

 finish:
        if (p != MAP_FAILED)
                munmap((void*) p, sz);

        return r;
}

static int add_locales_from_libdir (Set *locales) {
        DIR *dir;
        struct dirent *entry;
        int r;

        dir = opendir("/usr/lib/locale");
        if (!dir) {
                log_error("Failed to open locale directory: %m");
                r = -errno;
                goto finish;
        }

        errno = 0;
        while ((entry = readdir(dir))) {
                char *z;

                if (entry->d_type != DT_DIR)
                        continue;

                if (ignore_file(entry->d_name))
                        continue;

                z = strdup(entry->d_name);
                if (!z) {
                        r = log_oom();
                        goto finish;
                }

                r = set_put(locales, z);
                if (r < 0) {
                        free(z);

                        if (r != -EEXIST) {
                                log_error("Failed to add locale: %s", strerror(-r));
                                goto finish;
                        }
                }

                errno = 0;
        }

        if (errno != 0) {
                log_error("Failed to read locale directory: %m");
                r = -errno;
                goto finish;
        }

        r = 0;

 finish:
        closedir(dir);
        return r;
}

static int list_locales(DBusConnection *bus, char **args, unsigned n) {
        Set *locales;
        _cleanup_strv_free_ char **l = NULL;
        char **j;
        int r;

        locales = set_new(string_hash_func, string_compare_func);
        if (!locales)
                return log_oom();

        r = add_locales_from_archive(locales);
        if (r < 0 && r != -ENOENT)
                goto finish;

        r = add_locales_from_libdir(locales);
        if (r < 0)
                goto finish;

        l = set_get_strv(locales);
        if (!l) {
                r = log_oom();
                goto finish;
        }

        strv_sort(l);

        pager_open_if_enabled();

        STRV_FOREACH(j, l)
                puts(*j);

        r = 0;

finish:
        set_free(locales);

        return r;
}

static int set_vconsole_keymap(DBusConnection *bus, char **args, unsigned n) {
        _cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
        dbus_bool_t interactive = true, b;
        const char *map, *toggle_map;

        assert(bus);
        assert(args);

        if (n > 3) {
                log_error("Too many arguments.");
                return -EINVAL;
        }

        polkit_agent_open_if_enabled();

        map = args[1];
        toggle_map = n > 2 ? args[2] : "";
        b = arg_convert;

        return bus_method_call_with_reply(
                        bus,
                        "org.freedesktop.locale1",
                        "/org/freedesktop/locale1",
                        "org.freedesktop.locale1",
                        "SetVConsoleKeyboard",
                        &reply,
                        NULL,
                        DBUS_TYPE_STRING, &map,
                        DBUS_TYPE_STRING, &toggle_map,
                        DBUS_TYPE_BOOLEAN, &b,
                        DBUS_TYPE_BOOLEAN, &interactive,
                        DBUS_TYPE_INVALID);
}

static Set *keymaps = NULL;

static int nftw_cb(
                const char *fpath,
                const struct stat *sb,
                int tflag,
                struct FTW *ftwbuf) {

        char *p, *e;
        int r;

        if (tflag != FTW_F)
                return 0;

        if (!endswith(fpath, ".map") &&
            !endswith(fpath, ".map.gz"))
                return 0;

        p = strdup(path_get_file_name(fpath));
        if (!p)
                return log_oom();

        e = endswith(p, ".map");
        if (e)
                *e = 0;

        e = endswith(p, ".map.gz");
        if (e)
                *e = 0;

        r = set_put(keymaps, p);
        if (r == -EEXIST)
                free(p);
        else if (r < 0) {
                log_error("Can't add keymap: %s", strerror(-r));
                free(p);
                return r;
        }

        return 0;
}

static int list_vconsole_keymaps(DBusConnection *bus, char **args, unsigned n) {
        char _cleanup_strv_free_ **l = NULL;
        char **i;

        keymaps = set_new(string_hash_func, string_compare_func);
        if (!keymaps)
                return log_oom();

        nftw("/usr/share/kbd/keymaps/", nftw_cb, 20, FTW_MOUNT|FTW_PHYS);
        nftw("/usr/lib/kbd/keymaps/", nftw_cb, 20, FTW_MOUNT|FTW_PHYS);
        nftw("/lib/kbd/keymaps/", nftw_cb, 20, FTW_MOUNT|FTW_PHYS);

        l = set_get_strv(keymaps);
        if (!l) {
                set_free_free(keymaps);
                return log_oom();
        }

        set_free(keymaps);

        if (strv_isempty(l)) {
                log_error("Couldn't find any console keymaps.");
                return -ENOENT;
        }

        strv_sort(l);

        pager_open_if_enabled();

        STRV_FOREACH(i, l)
                puts(*i);


        return 0;
}

static int set_x11_keymap(DBusConnection *bus, char **args, unsigned n) {
        _cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
        dbus_bool_t interactive = true, b;
        const char *layout, *model, *variant, *options;

        assert(bus);
        assert(args);

        if (n > 5) {
                log_error("Too many arguments.");
                return -EINVAL;
        }

        polkit_agent_open_if_enabled();

        layout = args[1];
        model = n > 2 ? args[2] : "";
        variant = n > 3 ? args[3] : "";
        options = n > 4 ? args[4] : "";
        b = arg_convert;

        return bus_method_call_with_reply(
                        bus,
                        "org.freedesktop.locale1",
                        "/org/freedesktop/locale1",
                        "org.freedesktop.locale1",
                        "SetX11Keyboard",
                        &reply,
                        NULL,
                        DBUS_TYPE_STRING, &layout,
                        DBUS_TYPE_STRING, &model,
                        DBUS_TYPE_STRING, &variant,
                        DBUS_TYPE_STRING, &options,
                        DBUS_TYPE_BOOLEAN, &b,
                        DBUS_TYPE_BOOLEAN, &interactive,
                        DBUS_TYPE_INVALID);
}

static int help(void) {

        printf("%s [OPTIONS...] COMMAND ...\n\n"
               "Query or change system time and date settings.\n\n"
               "  -h --help              Show this help\n"
               "     --version           Show package version\n"
               "     --no-convert        Don't convert keyboard mappings\n"
               "     --no-pager          Do not pipe output into a pager\n"
               "     --no-ask-password   Do not prompt for password\n"
               "  -H --host=[USER@]HOST  Operate on remote host\n\n"
               "Commands:\n"
               "  status                 Show current locale settings\n"
               "  set-locale LOCALE...   Set system locale\n"
               "  list-locales           Show known locales\n"
               "  set-keymap MAP [MAP]   Set virtual console keyboard mapping\n"
               "  list-keymaps           Show known virtual console keyboard mappings\n"
               "  set-x11-keymap LAYOUT [MODEL] [VARIANT] [OPTIONS]\n"
               "                         Set X11 keyboard mapping\n",
               program_invocation_short_name);

        return 0;
}

static int parse_argv(int argc, char *argv[]) {

        enum {
                ARG_VERSION = 0x100,
                ARG_NO_PAGER,
                ARG_NO_CONVERT,
                ARG_NO_ASK_PASSWORD
        };

        static const struct option options[] = {
                { "help",                no_argument,       NULL, 'h'                     },
                { "version",             no_argument,       NULL, ARG_VERSION             },
                { "no-pager",            no_argument,       NULL, ARG_NO_PAGER            },
                { "host",                required_argument, NULL, 'H'                     },
                { "privileged",          no_argument,       NULL, 'P'                     },
                { "no-ask-password",     no_argument,       NULL, ARG_NO_ASK_PASSWORD     },
                { "no-convert",          no_argument,       NULL, ARG_NO_CONVERT          },
                { NULL,                  0,                 NULL, 0                       }
        };

        int c;

        assert(argc >= 0);
        assert(argv);

        while ((c = getopt_long(argc, argv, "has:H:P", options, NULL)) >= 0) {

                switch (c) {

                case 'h':
                        help();
                        return 0;

                case ARG_VERSION:
                        puts(PACKAGE_STRING);
                        puts(SYSTEMD_FEATURES);
                        return 0;

                case 'P':
                        arg_transport = TRANSPORT_POLKIT;
                        break;

                case 'H':
                        arg_transport = TRANSPORT_SSH;
                        arg_host = optarg;
                        break;

                case ARG_NO_CONVERT:
                        arg_convert = false;
                        break;

                case ARG_NO_PAGER:
                        arg_no_pager = true;
                        break;

                case '?':
                        return -EINVAL;

                default:
                        log_error("Unknown option code %c", c);
                        return -EINVAL;
                }
        }

        return 1;
}

static int localectl_main(DBusConnection *bus, int argc, char *argv[], DBusError *error) {

        static const struct {
                const char* verb;
                const enum {
                        MORE,
                        LESS,
                        EQUAL
                } argc_cmp;
                const int argc;
                int (* const dispatch)(DBusConnection *bus, char **args, unsigned n);
        } verbs[] = {
                { "status",         LESS,   1, show_status           },
                { "set-locale",     MORE,   2, set_locale            },
                { "list-locales",   EQUAL,  1, list_locales          },
                { "set-keymap",     MORE,   2, set_vconsole_keymap   },
                { "list-keymaps",   EQUAL,  1, list_vconsole_keymaps },
                { "set-x11-keymap", MORE,   2, set_x11_keymap        },
        };

        int left;
        unsigned i;

        assert(argc >= 0);
        assert(argv);
        assert(error);

        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.");
        }

        if (!bus) {
                log_error("Failed to get D-Bus connection: %s", error->message);
                return -EIO;
        }

        return verbs[i].dispatch(bus, argv + optind, left);
}

int main(int argc, char *argv[]) {
        int r, retval = EXIT_FAILURE;
        DBusConnection *bus = NULL;
        DBusError error;

        dbus_error_init(&error);

        setlocale(LC_ALL, "");
        log_parse_environment();
        log_open();

        r = parse_argv(argc, argv);
        if (r < 0)
                goto finish;
        else if (r == 0) {
                retval = EXIT_SUCCESS;
                goto finish;
        }

        if (arg_transport == TRANSPORT_NORMAL)
                bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
        else if (arg_transport == TRANSPORT_POLKIT)
                bus_connect_system_polkit(&bus, &error);
        else if (arg_transport == TRANSPORT_SSH)
                bus_connect_system_ssh(NULL, arg_host, &bus, &error);
        else
                assert_not_reached("Uh, invalid transport...");

        r = localectl_main(bus, argc, argv, &error);
        retval = r < 0 ? EXIT_FAILURE : r;

finish:
        if (bus) {
                dbus_connection_flush(bus);
                dbus_connection_close(bus);
                dbus_connection_unref(bus);
        }

        dbus_error_free(&error);
        dbus_shutdown();

        pager_close();

        return retval;
}