New upstream version 1.29.90 upstream/1.29.90

1 files changed, 649 insertions, 0 deletions

diff --git a/src/core/nm-hostname-manager.c b/src/core/nm-hostname-manager.c
new file mode 100644
index 00000000..c99c8326
--- /dev/null
+++ b/src/core/nm-hostname-manager.c
@@ -0,0 +1,649 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2017 Red Hat, Inc.
+ */
+
+#include "src/core/nm-default-daemon.h"
+
+#include "nm-hostname-manager.h"
+
+#include <sys/stat.h>
+
+#if HAVE_SELINUX
+    #include <selinux/selinux.h>
+    #include <selinux/label.h>
+#endif
+
+#include "nm-libnm-core-intern/nm-common-macros.h"
+#include "nm-dbus-interface.h"
+#include "nm-connection.h"
+#include "nm-utils.h"
+#include "nm-core-internal.h"
+
+#include "NetworkManagerUtils.h"
+
+/*****************************************************************************/
+
+#define HOSTNAMED_SERVICE_NAME      "org.freedesktop.hostname1"
+#define HOSTNAMED_SERVICE_PATH      "/org/freedesktop/hostname1"
+#define HOSTNAMED_SERVICE_INTERFACE "org.freedesktop.hostname1"
+
+#define HOSTNAME_FILE_DEFAULT        "/etc/hostname"
+#define HOSTNAME_FILE_UCASE_HOSTNAME "/etc/HOSTNAME"
+#define HOSTNAME_FILE_GENTOO         "/etc/conf.d/hostname"
+
+#define CONF_DHCP SYSCONFDIR "/sysconfig/network/dhcp"
+
+#if (defined(HOSTNAME_PERSIST_SUSE) + defined(HOSTNAME_PERSIST_SLACKWARE) \
+     + defined(HOSTNAME_PERSIST_GENTOO))                                  \
+    > 1
+    #error "Can only define one of HOSTNAME_PERSIST_*"
+#endif
+
+#if defined(HOSTNAME_PERSIST_SUSE)
+    #define HOSTNAME_FILE HOSTNAME_FILE_UCASE_HOSTNAME
+#elif defined(HOSTNAME_PERSIST_SLACKWARE)
+    #define HOSTNAME_FILE HOSTNAME_FILE_UCASE_HOSTNAME
+#elif defined(HOSTNAME_PERSIST_GENTOO)
+    #define HOSTNAME_FILE HOSTNAME_FILE_GENTOO
+#else
+    #define HOSTNAME_FILE HOSTNAME_FILE_DEFAULT
+#endif
+
+/*****************************************************************************/
+
+NM_GOBJECT_PROPERTIES_DEFINE(NMHostnameManager, PROP_HOSTNAME, );
+
+typedef struct {
+    char *        current_hostname;
+    GFileMonitor *monitor;
+    GFileMonitor *dhcp_monitor;
+    gulong        monitor_id;
+    gulong        dhcp_monitor_id;
+    GDBusProxy *  hostnamed_proxy;
+} NMHostnameManagerPrivate;
+
+struct _NMHostnameManager {
+    GObject                  parent;
+    NMHostnameManagerPrivate _priv;
+};
+
+struct _NMHostnameManagerClass {
+    GObjectClass parent;
+};
+
+G_DEFINE_TYPE(NMHostnameManager, nm_hostname_manager, G_TYPE_OBJECT);
+
+#define NM_HOSTNAME_MANAGER_GET_PRIVATE(self) \
+    _NM_GET_PRIVATE(self, NMHostnameManager, NM_IS_HOSTNAME_MANAGER)
+
+NM_DEFINE_SINGLETON_GETTER(NMHostnameManager, nm_hostname_manager_get, NM_TYPE_HOSTNAME_MANAGER);
+
+/*****************************************************************************/
+
+#define _NMLOG_DOMAIN      LOGD_CORE
+#define _NMLOG(level, ...) __NMLOG_DEFAULT(level, _NMLOG_DOMAIN, "hostname", __VA_ARGS__)
+
+/*****************************************************************************/
+
+#if defined(HOSTNAME_PERSIST_GENTOO)
+static char *
+read_hostname_gentoo(const char *path)
+{
+    gs_free char *     contents  = NULL;
+    gs_strfreev char **all_lines = NULL;
+    const char *       tmp;
+    guint              i;
+
+    if (!g_file_get_contents(path, &contents, NULL, NULL))
+        return NULL;
+
+    all_lines = g_strsplit(contents, "\n", 0);
+    for (i = 0; all_lines[i]; i++) {
+        g_strstrip(all_lines[i]);
+        if (all_lines[i][0] == '#' || all_lines[i][0] == '\0')
+            continue;
+        if (g_str_has_prefix(all_lines[i], "hostname=")) {
+            tmp = &all_lines[i][NM_STRLEN("hostname=")];
+            return g_shell_unquote(tmp, NULL);
+        }
+    }
+    return NULL;
+}
+#endif
+
+#if defined(HOSTNAME_PERSIST_SLACKWARE)
+static char *
+read_hostname_slackware(const char *path)
+{
+    gs_free char *     contents  = NULL;
+    gs_strfreev char **all_lines = NULL;
+    guint              i         = 0;
+
+    if (!g_file_get_contents(path, &contents, NULL, NULL))
+        return NULL;
+
+    all_lines = g_strsplit(contents, "\n", 0);
+    for (i = 0; all_lines[i]; i++) {
+        g_strstrip(all_lines[i]);
+        if (all_lines[i][0] == '#' || all_lines[i][0] == '\0')
+            continue;
+        return g_shell_unquote(&all_lines[i][0], NULL);
+    }
+    return NULL;
+}
+#endif
+
+#if defined(HOSTNAME_PERSIST_SUSE)
+static gboolean
+hostname_is_dynamic(void)
+{
+    GIOChannel *channel;
+    char *      str     = NULL;
+    gboolean    dynamic = FALSE;
+
+    channel = g_io_channel_new_file(CONF_DHCP, "r", NULL);
+    if (!channel)
+        return dynamic;
+
+    while (g_io_channel_read_line(channel, &str, NULL, NULL, NULL) != G_IO_STATUS_EOF) {
+        if (str) {
+            g_strstrip(str);
+            if (g_str_has_prefix(str, "DHCLIENT_SET_HOSTNAME="))
+                dynamic = strcmp(&str[NM_STRLEN("DHCLIENT_SET_HOSTNAME=")], "\"yes\"") == 0;
+            g_free(str);
+        }
+    }
+
+    g_io_channel_shutdown(channel, FALSE, NULL);
+    g_io_channel_unref(channel);
+
+    return dynamic;
+}
+#endif
+
+/* Returns an allocated string which the caller owns and must eventually free */
+char *
+nm_hostname_manager_read_hostname(NMHostnameManager *self)
+{
+    NMHostnameManagerPrivate *priv     = NM_HOSTNAME_MANAGER_GET_PRIVATE(self);
+    char *                    hostname = NULL;
+
+    if (priv->hostnamed_proxy) {
+        hostname = g_strdup(priv->current_hostname);
+        goto out;
+    }
+
+#if defined(HOSTNAME_PERSIST_SUSE)
+    if (priv->dhcp_monitor_id && hostname_is_dynamic())
+        return NULL;
+#endif
+
+#if defined(HOSTNAME_PERSIST_GENTOO)
+    hostname = read_hostname_gentoo(HOSTNAME_FILE);
+#elif defined(HOSTNAME_PERSIST_SLACKWARE)
+    hostname = read_hostname_slackware(HOSTNAME_FILE);
+#else
+    if (g_file_get_contents(HOSTNAME_FILE, &hostname, NULL, NULL))
+        g_strchomp(hostname);
+#endif
+
+out:
+    if (hostname && !hostname[0]) {
+        g_free(hostname);
+        return NULL;
+    }
+
+    return hostname;
+}
+
+/*****************************************************************************/
+
+const char *
+nm_hostname_manager_get_hostname(NMHostnameManager *self)
+{
+    g_return_val_if_fail(NM_IS_HOSTNAME_MANAGER(self), NULL);
+    return NM_HOSTNAME_MANAGER_GET_PRIVATE(self)->current_hostname;
+}
+
+static void
+_set_hostname_take(NMHostnameManager *self, char *hostname)
+{
+    NMHostnameManagerPrivate *priv = NM_HOSTNAME_MANAGER_GET_PRIVATE(self);
+
+    _LOGI("hostname changed from %s%s%s to %s%s%s",
+          NM_PRINT_FMT_QUOTED(priv->current_hostname, "\"", priv->current_hostname, "\"", "(none)"),
+          NM_PRINT_FMT_QUOTED(hostname, "\"", hostname, "\"", "(none)"));
+
+    g_free(priv->current_hostname);
+    priv->current_hostname = hostname;
+    _notify(self, PROP_HOSTNAME);
+}
+
+static void
+_set_hostname(NMHostnameManager *self, const char *hostname)
+{
+    NMHostnameManagerPrivate *priv = NM_HOSTNAME_MANAGER_GET_PRIVATE(self);
+
+    hostname = nm_str_not_empty(hostname);
+    if (!nm_streq0(hostname, priv->current_hostname))
+        _set_hostname_take(self, g_strdup(hostname));
+}
+
+static void
+_set_hostname_read(NMHostnameManager *self)
+{
+    NMHostnameManagerPrivate *priv = NM_HOSTNAME_MANAGER_GET_PRIVATE(self);
+    char *                    hostname;
+
+    if (priv->hostnamed_proxy) {
+        /* read-hostname returns the current hostname with hostnamed. */
+        return;
+    }
+
+    hostname = nm_hostname_manager_read_hostname(self);
+
+    if (nm_streq0(hostname, priv->current_hostname)) {
+        g_free(hostname);
+        return;
+    }
+
+    _set_hostname_take(self, hostname);
+}
+
+/*****************************************************************************/
+
+typedef struct {
+    char *                         hostname;
+    NMHostnameManagerSetHostnameCb cb;
+    gpointer                       user_data;
+} SetHostnameInfo;
+
+static void
+set_transient_hostname_done(GObject *object, GAsyncResult *res, gpointer user_data)
+{
+    GDBusProxy *proxy                 = G_DBUS_PROXY(object);
+    gs_free SetHostnameInfo *info     = user_data;
+    gs_unref_variant GVariant *result = NULL;
+    gs_free_error GError *error       = NULL;
+
+    result = g_dbus_proxy_call_finish(proxy, res, &error);
+
+    if (error) {
+        _LOGW("couldn't set the system hostname to '%s' using hostnamed: %s",
+              info->hostname,
+              error->message);
+    }
+
+    info->cb(info->hostname, !error, info->user_data);
+    g_free(info->hostname);
+}
+
+void
+nm_hostname_manager_set_transient_hostname(NMHostnameManager *            self,
+                                           const char *                   hostname,
+                                           NMHostnameManagerSetHostnameCb cb,
+                                           gpointer                       user_data)
+{
+    NMHostnameManagerPrivate *priv;
+    SetHostnameInfo *         info;
+
+    g_return_if_fail(NM_IS_HOSTNAME_MANAGER(self));
+
+    priv = NM_HOSTNAME_MANAGER_GET_PRIVATE(self);
+
+    if (!priv->hostnamed_proxy) {
+        cb(hostname, FALSE, user_data);
+        return;
+    }
+
+    info            = g_new0(SetHostnameInfo, 1);
+    info->hostname  = g_strdup(hostname);
+    info->cb        = cb;
+    info->user_data = user_data;
+
+    g_dbus_proxy_call(priv->hostnamed_proxy,
+                      "SetHostname",
+                      g_variant_new("(sb)", hostname, FALSE),
+                      G_DBUS_CALL_FLAGS_NONE,
+                      -1,
+                      NULL,
+                      set_transient_hostname_done,
+                      info);
+}
+
+gboolean
+nm_hostname_manager_get_transient_hostname(NMHostnameManager *self, char **hostname)
+{
+    NMHostnameManagerPrivate *priv = NM_HOSTNAME_MANAGER_GET_PRIVATE(self);
+    GVariant *                v_hostname;
+
+    if (!priv->hostnamed_proxy)
+        return FALSE;
+
+    v_hostname = g_dbus_proxy_get_cached_property(priv->hostnamed_proxy, "Hostname");
+    if (!v_hostname) {
+        _LOGT("transient hostname retrieval failed");
+        return FALSE;
+    }
+
+    *hostname = g_variant_dup_string(v_hostname, NULL);
+    g_variant_unref(v_hostname);
+
+    return TRUE;
+}
+
+gboolean
+nm_hostname_manager_write_hostname(NMHostnameManager *self, const char *hostname)
+{
+    NMHostnameManagerPrivate *priv;
+    char *                    hostname_eol;
+    gboolean                  ret;
+    gs_free_error GError *error     = NULL;
+    const char *          file      = HOSTNAME_FILE;
+    gs_free char *        link_path = NULL;
+    gs_unref_variant GVariant *var  = NULL;
+    struct stat                file_stat;
+#if HAVE_SELINUX
+    gboolean fcon_was_set = FALSE;
+    char *   fcon_prev    = NULL;
+#endif
+
+    g_return_val_if_fail(NM_IS_HOSTNAME_MANAGER(self), FALSE);
+
+    priv = NM_HOSTNAME_MANAGER_GET_PRIVATE(self);
+
+    if (priv->hostnamed_proxy) {
+        var = g_dbus_proxy_call_sync(priv->hostnamed_proxy,
+                                     "SetStaticHostname",
+                                     g_variant_new("(sb)", hostname, FALSE),
+                                     G_DBUS_CALL_FLAGS_NONE,
+                                     -1,
+                                     NULL,
+                                     &error);
+        if (error)
+            _LOGW("could not set hostname: %s", error->message);
+
+        return !error;
+    }
+
+    /* If the hostname file is a symbolic link, follow it to find where the
+     * real file is located, otherwise g_file_set_contents will attempt to
+     * replace the link with a plain file.
+     */
+    if (lstat(file, &file_stat) == 0 && S_ISLNK(file_stat.st_mode)
+        && (link_path = nm_utils_read_link_absolute(file, NULL)))
+        file = link_path;
+
+#if defined(HOSTNAME_PERSIST_GENTOO)
+    hostname_eol = g_strdup_printf("#Generated by NetworkManager\n"
+                                   "hostname=\"%s\"\n",
+                                   hostname);
+#else
+    hostname_eol = g_strdup_printf("%s\n", hostname);
+#endif
+
+#if HAVE_SELINUX
+    /* Get default context for hostname file and set it for fscreate */
+    {
+        struct selabel_handle *handle;
+
+        handle = selabel_open(SELABEL_CTX_FILE, NULL, 0);
+        if (handle) {
+            mode_t st_mode = 0;
+            char * fcon    = NULL;
+
+            if (stat(file, &file_stat) == 0)
+                st_mode = file_stat.st_mode;
+
+            if ((selabel_lookup(handle, &fcon, file, st_mode) == 0)
+                && (getfscreatecon(&fcon_prev) == 0)) {
+                setfscreatecon(fcon);
+                fcon_was_set = TRUE;
+            }
+
+            selabel_close(handle);
+            freecon(fcon);
+        }
+    }
+#endif
+
+    ret = g_file_set_contents(file, hostname_eol, -1, &error);
+
+#if HAVE_SELINUX
+    /* Restore previous context and cleanup */
+    if (fcon_was_set)
+        setfscreatecon(fcon_prev);
+    if (fcon_prev)
+        freecon(fcon_prev);
+#endif
+
+    g_free(hostname_eol);
+
+    if (!ret) {
+        _LOGW("could not save hostname to %s: %s", file, error->message);
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+gboolean
+nm_hostname_manager_validate_hostname(const char *hostname)
+{
+    const char *p;
+    gboolean    dot = TRUE;
+
+    if (!hostname || !hostname[0])
+        return FALSE;
+
+    for (p = hostname; *p; p++) {
+        if (*p == '.') {
+            if (dot)
+                return FALSE;
+            dot = TRUE;
+        } else {
+            if (!g_ascii_isalnum(*p) && (*p != '-') && (*p != '_'))
+                return FALSE;
+            dot = FALSE;
+        }
+    }
+
+    if (dot)
+        return FALSE;
+
+    return (p - hostname <= HOST_NAME_MAX);
+}
+
+static void
+hostname_file_changed_cb(GFileMonitor *    monitor,
+                         GFile *           file,
+                         GFile *           other_file,
+                         GFileMonitorEvent event_type,
+                         gpointer          user_data)
+{
+    _set_hostname_read(user_data);
+}
+
+/*****************************************************************************/
+
+static void
+hostnamed_properties_changed(GDBusProxy *proxy,
+                             GVariant *  changed_properties,
+                             char **     invalidated_properties,
+                             gpointer    user_data)
+{
+    NMHostnameManager *       self = user_data;
+    NMHostnameManagerPrivate *priv = NM_HOSTNAME_MANAGER_GET_PRIVATE(self);
+    GVariant *                v_hostname;
+
+    v_hostname = g_dbus_proxy_get_cached_property(priv->hostnamed_proxy, "StaticHostname");
+    if (v_hostname) {
+        _set_hostname(self, g_variant_get_string(v_hostname, NULL));
+        g_variant_unref(v_hostname);
+    }
+}
+
+static void
+setup_hostname_file_monitors(NMHostnameManager *self)
+{
+    NMHostnameManagerPrivate *priv = NM_HOSTNAME_MANAGER_GET_PRIVATE(self);
+    GFileMonitor *            monitor;
+    const char *              path      = HOSTNAME_FILE;
+    char *                    link_path = NULL;
+    struct stat               file_stat;
+    GFile *                   file;
+
+    /* resolve the path to the hostname file if it is a symbolic link */
+    if (lstat(path, &file_stat) == 0 && S_ISLNK(file_stat.st_mode)
+        && (link_path = nm_utils_read_link_absolute(path, NULL))) {
+        path = link_path;
+        if (lstat(link_path, &file_stat) == 0 && S_ISLNK(file_stat.st_mode)) {
+            _LOGW("only one level of symbolic link indirection is allowed when "
+                  "monitoring " HOSTNAME_FILE);
+        }
+    }
+
+    /* monitor changes to hostname file */
+    file    = g_file_new_for_path(path);
+    monitor = g_file_monitor_file(file, G_FILE_MONITOR_NONE, NULL, NULL);
+    g_object_unref(file);
+    g_free(link_path);
+    if (monitor) {
+        priv->monitor_id =
+            g_signal_connect(monitor, "changed", G_CALLBACK(hostname_file_changed_cb), self);
+        priv->monitor = monitor;
+    }
+
+#if defined(HOSTNAME_PERSIST_SUSE)
+    /* monitor changes to dhcp file to know whether the hostname is valid */
+    file    = g_file_new_for_path(CONF_DHCP);
+    monitor = g_file_monitor_file(file, G_FILE_MONITOR_NONE, NULL, NULL);
+    g_object_unref(file);
+    if (monitor) {
+        priv->dhcp_monitor_id =
+            g_signal_connect(monitor, "changed", G_CALLBACK(hostname_file_changed_cb), self);
+        priv->dhcp_monitor = monitor;
+    }
+#endif
+
+    _set_hostname_read(self);
+}
+
+/*****************************************************************************/
+
+static void
+get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
+{
+    NMHostnameManager *self = NM_HOSTNAME_MANAGER(object);
+
+    switch (prop_id) {
+    case PROP_HOSTNAME:
+        g_value_set_string(value, nm_hostname_manager_get_hostname(self));
+        break;
+    default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+        break;
+    }
+}
+
+/*****************************************************************************/
+
+static void
+nm_hostname_manager_init(NMHostnameManager *self)
+{}
+
+static void
+constructed(GObject *object)
+{
+    NMHostnameManager *       self = NM_HOSTNAME_MANAGER(object);
+    NMHostnameManagerPrivate *priv = NM_HOSTNAME_MANAGER_GET_PRIVATE(self);
+    GDBusProxy *              proxy;
+    GVariant *                variant;
+    gs_free_error GError *error = NULL;
+
+    proxy = g_dbus_proxy_new_for_bus_sync(G_BUS_TYPE_SYSTEM,
+                                          0,
+                                          NULL,
+                                          HOSTNAMED_SERVICE_NAME,
+                                          HOSTNAMED_SERVICE_PATH,
+                                          HOSTNAMED_SERVICE_INTERFACE,
+                                          NULL,
+                                          &error);
+    if (proxy) {
+        variant = g_dbus_proxy_get_cached_property(proxy, "StaticHostname");
+        if (variant) {
+            _LOGI("hostname: using hostnamed");
+            priv->hostnamed_proxy = proxy;
+            g_signal_connect(proxy,
+                             "g-properties-changed",
+                             G_CALLBACK(hostnamed_properties_changed),
+                             self);
+            hostnamed_properties_changed(proxy, NULL, NULL, self);
+            g_variant_unref(variant);
+        } else {
+            _LOGI("hostname: couldn't get property from hostnamed");
+            g_object_unref(proxy);
+        }
+    } else {
+        _LOGI("hostname: hostnamed not used as proxy creation failed with: %s", error->message);
+        g_clear_error(&error);
+    }
+
+    if (!priv->hostnamed_proxy)
+        setup_hostname_file_monitors(self);
+
+    G_OBJECT_CLASS(nm_hostname_manager_parent_class)->constructed(object);
+}
+
+static void
+dispose(GObject *object)
+{
+    NMHostnameManager *       self = NM_HOSTNAME_MANAGER(object);
+    NMHostnameManagerPrivate *priv = NM_HOSTNAME_MANAGER_GET_PRIVATE(self);
+
+    if (priv->hostnamed_proxy) {
+        g_signal_handlers_disconnect_by_func(priv->hostnamed_proxy,
+                                             G_CALLBACK(hostnamed_properties_changed),
+                                             self);
+        g_clear_object(&priv->hostnamed_proxy);
+    }
+
+    if (priv->monitor) {
+        if (priv->monitor_id)
+            g_signal_handler_disconnect(priv->monitor, priv->monitor_id);
+
+        g_file_monitor_cancel(priv->monitor);
+        g_clear_object(&priv->monitor);
+    }
+
+    if (priv->dhcp_monitor) {
+        if (priv->dhcp_monitor_id)
+            g_signal_handler_disconnect(priv->dhcp_monitor, priv->dhcp_monitor_id);
+
+        g_file_monitor_cancel(priv->dhcp_monitor);
+        g_clear_object(&priv->dhcp_monitor);
+    }
+
+    nm_clear_g_free(&priv->current_hostname);
+
+    G_OBJECT_CLASS(nm_hostname_manager_parent_class)->dispose(object);
+}
+
+static void
+nm_hostname_manager_class_init(NMHostnameManagerClass *class)
+{
+    GObjectClass *object_class = G_OBJECT_CLASS(class);
+
+    object_class->constructed  = constructed;
+    object_class->get_property = get_property;
+    object_class->dispose      = dispose;
+
+    obj_properties[PROP_HOSTNAME] = g_param_spec_string(NM_HOSTNAME_MANAGER_HOSTNAME,
+                                                        "",
+                                                        "",
+                                                        NULL,
+                                                        G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
+
+    g_object_class_install_properties(object_class, _PROPERTY_ENUMS_LAST, obj_properties);
+}