/* GIO - GLib Input, Output and Streaming Library * * Copyright (C) 2008 Red Hat, Inc. * * This library 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 of the License, or (at your option) any later version. * * This library 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 this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307, USA. * * Author: David Zeuthen */ /* * TODO: - locking * - cancellation */ #include #include #include #include #include #include #include #include #include #include "gvfsdnssdutils.h" #include "gvfsdnssdresolver.h" enum { PROP_0, PROP_ENCODED_TRIPLE, PROP_REQUIRED_TXT_KEYS, PROP_SERVICE_NAME, PROP_SERVICE_TYPE, PROP_DOMAIN, PROP_TIMEOUT_MSEC, PROP_IS_RESOLVED, PROP_ADDRESS, PROP_PORT, PROP_TXT_RECORDS, }; enum { CHANGED, LAST_SIGNAL }; static guint signals[LAST_SIGNAL] = { 0 }; struct _GVfsDnsSdResolver { GObject parent_instance; char *encoded_triple; char *service_name; char *service_type; char *domain; char *required_txt_keys; char **required_txt_keys_broken_out; guint timeout_msec; gboolean is_resolved; char *address; guint port; char **txt_records; AvahiServiceResolver *avahi_resolver; }; struct _GVfsDnsSdResolverClass { GObjectClass parent_class; /* signals */ void (*changed) (GVfsDnsSdResolver *resolver); }; G_DEFINE_TYPE (GVfsDnsSdResolver, g_vfs_dns_sd_resolver, G_TYPE_OBJECT); static gboolean resolver_supports_mdns = FALSE; static AvahiClient *global_client = NULL; static gboolean avahi_initialized = FALSE; static void free_global_avahi_client (void); static AvahiClient *get_global_avahi_client (GError **error); static gboolean ensure_avahi_resolver (GVfsDnsSdResolver *resolver, GError **error); static void service_resolver_cb (AvahiServiceResolver *resolver, AvahiIfIndex interface, AvahiProtocol protocol, AvahiResolverEvent event, const char *name, const char *type, const char *domain, const char *host_name, const AvahiAddress *a, uint16_t port, AvahiStringList *txt, AvahiLookupResultFlags flags, void *user_data); static GList *resolvers = NULL; static void clear_avahi_data (GVfsDnsSdResolver *resolver); static void remove_client_from_resolver (GVfsDnsSdResolver *resolver) { if (resolver->avahi_resolver != NULL) { avahi_service_resolver_free (resolver->avahi_resolver); resolver->avahi_resolver = NULL; } clear_avahi_data (resolver); } static void add_client_to_resolver (GVfsDnsSdResolver *resolver) { ensure_avahi_resolver (resolver, NULL); } /* Callback for state changes on the Client */ static void avahi_client_callback (AvahiClient *client, AvahiClientState state, void *userdata) { if (global_client == NULL) global_client = client; if (state == AVAHI_CLIENT_FAILURE) { if (avahi_client_errno (client) == AVAHI_ERR_DISCONNECTED) { free_global_avahi_client (); /* Attempt to reconnect */ get_global_avahi_client (NULL); } } else if (state == AVAHI_CLIENT_S_RUNNING) { /* Start resolving again */ g_list_foreach (resolvers, (GFunc) add_client_to_resolver, NULL); } } static void free_global_avahi_client (void) { /* Remove current resolvers */ g_list_foreach (resolvers, (GFunc) remove_client_from_resolver, NULL); /* Destroy client */ avahi_client_free (global_client); global_client = NULL; avahi_initialized = FALSE; } static AvahiClient * get_global_avahi_client (GError **error) { static AvahiGLibPoll *glib_poll = NULL; int avahi_error; if (!avahi_initialized) { avahi_initialized = TRUE; if (glib_poll == NULL) { avahi_set_allocator (avahi_glib_allocator ()); glib_poll = avahi_glib_poll_new (NULL, G_PRIORITY_DEFAULT); } /* Create a new AvahiClient instance */ global_client = avahi_client_new (avahi_glib_poll_get (glib_poll), AVAHI_CLIENT_NO_FAIL, avahi_client_callback, glib_poll, &avahi_error); if (global_client == NULL) { g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, _("Error initializing Avahi: %s"), avahi_strerror (avahi_error)); goto out; } } out: return global_client; } static gboolean ensure_avahi_resolver (GVfsDnsSdResolver *resolver, GError **error) { AvahiClient *avahi_client; gboolean ret; ret = FALSE; if (resolver->avahi_resolver != NULL) { ret = TRUE; goto out; } avahi_client = get_global_avahi_client (error); if (avahi_client == NULL) goto out; resolver->avahi_resolver = avahi_service_resolver_new (avahi_client, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, resolver->service_name, resolver->service_type, resolver->domain, AVAHI_PROTO_UNSPEC, 0, /* AvahiLookupFlags */ service_resolver_cb, resolver); if (resolver->avahi_resolver == NULL) { g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, _("Error creating Avahi resolver: %s"), avahi_strerror (avahi_client_errno (avahi_client))); goto out; } ret = TRUE; out: return ret; } static void g_vfs_dns_sd_resolver_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GVfsDnsSdResolver *resolver = G_VFS_DNS_SD_RESOLVER (object); switch (prop_id) { case PROP_ENCODED_TRIPLE: g_value_set_string (value, resolver->encoded_triple); break; case PROP_REQUIRED_TXT_KEYS: g_value_set_string (value, resolver->required_txt_keys); break; case PROP_SERVICE_NAME: g_value_set_string (value, resolver->service_name); break; case PROP_SERVICE_TYPE: g_value_set_string (value, resolver->service_type); break; case PROP_DOMAIN: g_value_set_string (value, resolver->domain); break; case PROP_TIMEOUT_MSEC: g_value_set_uint (value, resolver->timeout_msec); break; case PROP_IS_RESOLVED: g_value_set_boolean (value, resolver->is_resolved); break; case PROP_ADDRESS: g_value_set_string (value, resolver->address); break; case PROP_PORT: g_value_set_uint (value, resolver->port); break; case PROP_TXT_RECORDS: g_value_set_boxed (value, resolver->txt_records); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); } } static void g_vfs_dns_sd_resolver_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GVfsDnsSdResolver *resolver = G_VFS_DNS_SD_RESOLVER (object); switch (prop_id) { case PROP_ENCODED_TRIPLE: resolver->encoded_triple = g_strdup (g_value_get_string (value)); break; case PROP_REQUIRED_TXT_KEYS: resolver->required_txt_keys = g_strdup (g_value_get_string (value)); if (resolver->required_txt_keys != NULL) { /* TODO: maybe support escaping ',' */ resolver->required_txt_keys_broken_out = g_strsplit (resolver->required_txt_keys, ",", 0); } break; case PROP_SERVICE_NAME: resolver->service_name = g_strdup (g_value_get_string (value)); break; case PROP_SERVICE_TYPE: resolver->service_type = g_strdup (g_value_get_string (value)); break; case PROP_DOMAIN: resolver->domain = g_strdup (g_value_get_string (value)); break; case PROP_TIMEOUT_MSEC: resolver->timeout_msec = g_value_get_uint (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); } } static void g_vfs_dns_sd_resolver_finalize (GObject *object) { GVfsDnsSdResolver *resolver; resolver = G_VFS_DNS_SD_RESOLVER (object); g_free (resolver->encoded_triple); g_free (resolver->service_name); g_free (resolver->service_type); g_free (resolver->domain); g_free (resolver->required_txt_keys); g_strfreev (resolver->required_txt_keys_broken_out); g_free (resolver->address); g_strfreev (resolver->txt_records); if (resolver->avahi_resolver != NULL) avahi_service_resolver_free (resolver->avahi_resolver); resolvers = g_list_remove (resolvers, resolver); /* free the global avahi client for the last resolver */ if (resolvers == NULL) { free_global_avahi_client (); } G_OBJECT_CLASS (g_vfs_dns_sd_resolver_parent_class)->finalize (object); } static void g_vfs_dns_sd_resolver_constructed (GObject *object) { GVfsDnsSdResolver *resolver; resolver = G_VFS_DNS_SD_RESOLVER (object); if (resolver->encoded_triple != NULL) { GError *error; if (resolver->service_name != NULL) { g_warning ("Ignoring service-name since encoded-triple is already set"); g_free (resolver->service_name); resolver->service_name = NULL; } if (resolver->service_type != NULL) { g_warning ("Ignoring service-type since encoded-triple is already set"); g_free (resolver->service_type); resolver->service_type = NULL; } if (resolver->domain != NULL) { g_warning ("Ignoring domain since encoded-triple is already set"); g_free (resolver->domain); resolver->domain = NULL; } error = NULL; if (!g_vfs_decode_dns_sd_triple (resolver->encoded_triple, &(resolver->service_name), &(resolver->service_type), &(resolver->domain), &error)) { /* GObject construction can't fail. So whine if the triple isn't valid. */ g_warning ("Malformed construction data passed: %s", error->message); g_error_free (error); g_free (resolver->encoded_triple); g_free (resolver->service_name); g_free (resolver->service_type); g_free (resolver->domain); resolver->encoded_triple = NULL; resolver->service_name = NULL; resolver->service_type = NULL; resolver->domain = NULL; goto out; } } /* Always set encoded triple to what we encode; this is because we can decode * an encoded triple that isn't 100% properly URI encoded, e.g. * * "davidz's public files on quad.fubar.dk._webdav._tcp.local" * * will be properly decoded. But we want to return a properly URI encoded triple * * "davidz%27s%20public%20files%20on%20quad%2efubar%2edk._webdav._tcp.local" * * for e.g. setting the GMountSpec. This is useful because the use can * put the former into the pathbar in a file manager and then it will * be properly rewritten on mount. */ g_free (resolver->encoded_triple); resolver->encoded_triple = g_vfs_encode_dns_sd_triple (resolver->service_name, resolver->service_type, resolver->domain); /* start resolving immediately */ ensure_avahi_resolver (resolver, NULL); resolvers = g_list_prepend (resolvers, resolver); out: if (G_OBJECT_CLASS (g_vfs_dns_sd_resolver_parent_class)->constructed != NULL) G_OBJECT_CLASS (g_vfs_dns_sd_resolver_parent_class)->constructed (object); } static void g_vfs_dns_sd_resolver_class_init (GVfsDnsSdResolverClass *klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); resolver_supports_mdns = (avahi_nss_support () > 0); gobject_class->get_property = g_vfs_dns_sd_resolver_get_property; gobject_class->set_property = g_vfs_dns_sd_resolver_set_property; gobject_class->finalize = g_vfs_dns_sd_resolver_finalize; gobject_class->constructed = g_vfs_dns_sd_resolver_constructed; /** * GVfsDnsSdResolver::changed: * @resolver: The resolver emitting the signal. * * Emitted when resolved data changes. */ signals[CHANGED] = g_signal_new ("changed", G_VFS_TYPE_DNS_SD_RESOLVER, G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GVfsDnsSdResolverClass, changed), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0); /** * GVfsDnsSdResolver:encoded-triple: * * The encoded DNS-SD triple for the resolver. */ g_object_class_install_property (gobject_class, PROP_ENCODED_TRIPLE, g_param_spec_string ("encoded-triple", "Encoded triple", "Encoded triple", NULL, G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GVfsDnsSdResolver:required-txt-keys: * * A comma separated list of keys that must appear in the TXT * records in order to consider the service being resolved. */ g_object_class_install_property (gobject_class, PROP_REQUIRED_TXT_KEYS, g_param_spec_string ("required-txt-keys", "Required TXT keys", "Required TXT keys", NULL, G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GVfsDnsSdResolver:service-name: * * The name of the service for the resolver. */ g_object_class_install_property (gobject_class, PROP_SERVICE_NAME, g_param_spec_string ("service-name", "Service Name", "Service Name", NULL, G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GVfsDnsSdResolver:service-type: * * The type of the service for the resolver. */ g_object_class_install_property (gobject_class, PROP_SERVICE_TYPE, g_param_spec_string ("service-type", "Service Type", "Service Type", NULL, G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GVfsDnsSdResolver:domain: * * The domain for the resolver. */ g_object_class_install_property (gobject_class, PROP_DOMAIN, g_param_spec_string ("domain", "Domain", "Domain", NULL, G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GVfsDnsSdResolver:timeout-msec: * * Timeout in milliseconds to use when resolving. */ g_object_class_install_property (gobject_class, PROP_TIMEOUT_MSEC, g_param_spec_uint ("timeout-msec", "Timeout in milliseconds", "Timeout in milliseconds", 0, G_MAXUINT, 5000, G_PARAM_CONSTRUCT | G_PARAM_READWRITE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GVfsDnsSdResolver:is-resolved: * * Whether the service is resolved. */ g_object_class_install_property (gobject_class, PROP_IS_RESOLVED, g_param_spec_boolean ("is-resolved", "Is resolved", "Is resolved", FALSE, G_PARAM_READABLE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GVfsDnsSdResolver:address: * * The resolved address. */ g_object_class_install_property (gobject_class, PROP_DOMAIN, g_param_spec_string ("address", "Address", "Address", NULL, G_PARAM_READABLE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GVfsDnsSdResolver:port: * * The resolved port. */ g_object_class_install_property (gobject_class, PROP_PORT, g_param_spec_uint ("port", "Port", "Port", 0, 65536, 0, G_PARAM_READABLE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GVfsDnsSdResolver:txt-records: * * The resolved TXT records. */ g_object_class_install_property (gobject_class, PROP_TXT_RECORDS, g_param_spec_boxed ("txt-records", "TXT Records", "TXT Records", G_TYPE_STRV, G_PARAM_READABLE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); } static void g_vfs_dns_sd_resolver_init (GVfsDnsSdResolver *resolver) { } gboolean g_vfs_dns_sd_resolver_is_resolved (GVfsDnsSdResolver *resolver) { g_return_val_if_fail (G_VFS_IS_DNS_SD_RESOLVER (resolver), FALSE); return resolver->is_resolved; } const gchar * g_vfs_dns_sd_resolver_get_encoded_triple (GVfsDnsSdResolver *resolver) { g_return_val_if_fail (G_VFS_IS_DNS_SD_RESOLVER (resolver), NULL); return resolver->encoded_triple; } const gchar * g_vfs_dns_sd_resolver_get_required_txt_keys (GVfsDnsSdResolver *resolver) { g_return_val_if_fail (G_VFS_IS_DNS_SD_RESOLVER (resolver), NULL); return resolver->required_txt_keys; } const gchar * g_vfs_dns_sd_resolver_get_service_name (GVfsDnsSdResolver *resolver) { g_return_val_if_fail (G_VFS_IS_DNS_SD_RESOLVER (resolver), NULL); return resolver->service_name; } const gchar * g_vfs_dns_sd_resolver_get_service_type (GVfsDnsSdResolver *resolver) { g_return_val_if_fail (G_VFS_IS_DNS_SD_RESOLVER (resolver), NULL); return resolver->service_type; } const gchar * g_vfs_dns_sd_resolver_get_domain (GVfsDnsSdResolver *resolver) { g_return_val_if_fail (G_VFS_IS_DNS_SD_RESOLVER (resolver), NULL); return resolver->domain; } gchar * g_vfs_dns_sd_resolver_get_address (GVfsDnsSdResolver *resolver) { g_return_val_if_fail (G_VFS_IS_DNS_SD_RESOLVER (resolver), NULL); return g_strdup (resolver->address); } guint g_vfs_dns_sd_resolver_get_port (GVfsDnsSdResolver *resolver) { g_return_val_if_fail (G_VFS_IS_DNS_SD_RESOLVER (resolver), (guint) -1); return resolver->port; } gchar ** g_vfs_dns_sd_resolver_get_txt_records (GVfsDnsSdResolver *resolver) { g_return_val_if_fail (G_VFS_IS_DNS_SD_RESOLVER (resolver), NULL); return g_strdupv (resolver->txt_records); } gchar * g_vfs_dns_sd_resolver_lookup_txt_record (GVfsDnsSdResolver *resolver, const gchar *key) { gint n; gchar *result; gsize key_len; g_return_val_if_fail (G_VFS_IS_DNS_SD_RESOLVER (resolver), NULL); g_return_val_if_fail (key != NULL, NULL); result = NULL; if (resolver->txt_records == NULL) goto out; key_len = strlen (key); for (n = 0; resolver->txt_records[n] != NULL; n++) { const gchar *s = resolver->txt_records[n]; const gchar *p; p = strchr (s, '='); if (p != NULL && (p - s) == key_len) { if (g_ascii_strncasecmp (s, key, p - s) == 0) { result = g_strdup (p + 1); goto out; } } } out: return result; } GVfsDnsSdResolver * g_vfs_dns_sd_resolver_new_for_encoded_triple (const gchar *encoded_triple, const gchar *required_txt_keys) { g_return_val_if_fail (encoded_triple != NULL, NULL); return G_VFS_DNS_SD_RESOLVER (g_object_new (G_VFS_TYPE_DNS_SD_RESOLVER, "encoded-triple", encoded_triple, "required-txt-keys", required_txt_keys, NULL)); } GVfsDnsSdResolver * g_vfs_dns_sd_resolver_new_for_service (const gchar *service_name, const gchar *service_type, const gchar *domain, const gchar *required_txt_keys) { g_return_val_if_fail (service_name != NULL, NULL); g_return_val_if_fail (service_type != NULL, NULL); g_return_val_if_fail (domain != NULL, NULL); return G_VFS_DNS_SD_RESOLVER (g_object_new (G_VFS_TYPE_DNS_SD_RESOLVER, "service-name", service_name, "service-type", service_type, "domain", domain, "required-txt-keys", required_txt_keys, NULL)); } static int safe_strcmp (const char *a, const char *b) { if (a == NULL) a = ""; if (b == NULL) b = ""; return strcmp (a, b); } static gboolean strv_equal (char **a, char **b) { static char *dummy[1] = {NULL}; int n; gboolean ret; if (a == NULL) a = dummy; if (b == NULL) b = dummy; ret = FALSE; if (g_strv_length (a) != g_strv_length (b)) goto out; for (n = 0; a[n] != NULL && b[n] != NULL; n++) { if (strcmp (a[n], b[n]) != 0) goto out; } ret = TRUE; out: return ret; } static gboolean has_required_txt_keys (GVfsDnsSdResolver *resolver) { gboolean ret; int n; char *value; ret = FALSE; if (resolver->required_txt_keys_broken_out != NULL) { for (n = 0; resolver->required_txt_keys_broken_out[n] != NULL; n++) { value = g_vfs_dns_sd_resolver_lookup_txt_record (resolver, resolver->required_txt_keys_broken_out[n]); if (value == NULL) { /* key is missing */ goto out; } g_free (value); } } ret = TRUE; out: return ret; } static void set_avahi_data (GVfsDnsSdResolver *resolver, const char *host_name, AvahiProtocol protocol, const AvahiAddress *a, uint16_t port, AvahiStringList *txt) { char *address; gboolean changed; AvahiStringList *l; GPtrArray *p; char **txt_records; gboolean is_resolved; changed = FALSE; if (resolver_supports_mdns) { address = g_strdup (host_name); } else { char aa[128]; avahi_address_snprint (aa, sizeof(aa), a); if (protocol == AVAHI_PROTO_INET6) { /* an ipv6 address, follow RFC 2732 */ address = g_strdup_printf ("[%s]", aa); } else { address = g_strdup (aa); } } if (safe_strcmp (resolver->address, address) != 0) { g_free (resolver->address); resolver->address = g_strdup (address); g_object_notify (G_OBJECT (resolver), "address"); changed = TRUE; } g_free (address); if (resolver->port != port) { resolver->port = port; g_object_notify (G_OBJECT (resolver), "port"); changed = TRUE; } p = g_ptr_array_new (); for (l = txt; l != NULL; l = avahi_string_list_get_next (l)) { g_ptr_array_add (p, g_strdup ((const char *) l->text)); } g_ptr_array_add (p, NULL); txt_records = (char **) g_ptr_array_free (p, FALSE); if (strv_equal (resolver->txt_records, txt_records)) { g_strfreev (txt_records); } else { g_strfreev (resolver->txt_records); resolver->txt_records = txt_records; g_object_notify (G_OBJECT (resolver), "txt-records"); changed = TRUE; } is_resolved = has_required_txt_keys (resolver); if (is_resolved != resolver->is_resolved) { resolver->is_resolved = is_resolved; g_object_notify (G_OBJECT (resolver), "is-resolved"); changed = TRUE; } if (changed) g_signal_emit (resolver, signals[CHANGED], 0); } static void clear_avahi_data (GVfsDnsSdResolver *resolver) { gboolean changed; changed = FALSE; if (resolver->is_resolved) { resolver->is_resolved = FALSE; g_object_notify (G_OBJECT (resolver), "is-resolved"); changed = TRUE; } if (resolver->address != NULL) { g_free (resolver->address); resolver->address = NULL; g_object_notify (G_OBJECT (resolver), "address"); changed = TRUE; } if (resolver->port != 0) { resolver->port = 0; g_object_notify (G_OBJECT (resolver), "port"); changed = TRUE; } if (resolver->txt_records != NULL) { resolver->txt_records = NULL; g_object_notify (G_OBJECT (resolver), "txt-records"); changed = TRUE; } if (changed) g_signal_emit (resolver, signals[CHANGED], 0); } static void service_resolver_cb (AvahiServiceResolver *avahi_resolver, AvahiIfIndex interface, AvahiProtocol protocol, AvahiResolverEvent event, const char *name, const char *type, const char *domain, const char *host_name, const AvahiAddress *a, uint16_t port, AvahiStringList *txt, AvahiLookupResultFlags flags, void *user_data) { GVfsDnsSdResolver *resolver = G_VFS_DNS_SD_RESOLVER (user_data); switch (event) { case AVAHI_RESOLVER_FOUND: set_avahi_data (resolver, host_name, protocol, a, port, txt); break; case AVAHI_RESOLVER_FAILURE: clear_avahi_data (resolver); break; } } typedef struct { GVfsDnsSdResolver *resolver; GSimpleAsyncResult *simple; guint timeout_id; } ResolveData; static void service_resolver_changed (GVfsDnsSdResolver *resolver, ResolveData *data); static void resolve_data_free (ResolveData *data) { if (data->timeout_id > 0) g_source_remove (data->timeout_id); g_signal_handlers_disconnect_by_func (data->resolver, service_resolver_changed, data); g_object_unref (data->simple); g_free (data); } static void service_resolver_changed (GVfsDnsSdResolver *resolver, ResolveData *data) { if (resolver->is_resolved) { g_simple_async_result_set_op_res_gboolean (data->simple, TRUE); g_simple_async_result_complete (data->simple); resolve_data_free (data); } else { if (data->resolver->address != NULL) { /* keep going until timeout if we're missing TXT records */ } else { g_simple_async_result_set_error (data->simple, G_IO_ERROR, G_IO_ERROR_FAILED, /* Translators: * - the first %s refers to the service type * - the second %s refers to the service name * - the third %s refers to the domain */ _("Error resolving \"%s\" service \"%s\" on domain \"%s\""), data->resolver->service_type, data->resolver->service_name, data->resolver->domain); g_simple_async_result_complete (data->simple); resolve_data_free (data); } } } static gboolean service_resolver_timed_out (ResolveData *data) { if (data->resolver->address != NULL) { /* special case if one of the required TXT records are missing */ g_simple_async_result_set_error (data->simple, G_IO_ERROR, G_IO_ERROR_FAILED, /* Translators: * - the first %s refers to the service type * - the second %s refers to the service name * - the third %s refers to the domain * - the fourth %s refers to the required TXT keys */ _("Error resolving \"%s\" service \"%s\" on domain \"%s\". " "One or more TXT records are missing. Keys required: \"%s\"."), data->resolver->service_type, data->resolver->service_name, data->resolver->domain, data->resolver->required_txt_keys); } else { g_simple_async_result_set_error (data->simple, G_IO_ERROR, G_IO_ERROR_TIMED_OUT, /* Translators: * - the first %s refers to the service type * - the second %s refers to the service name * - the third %s refers to the domain */ _("Timed out resolving \"%s\" service \"%s\" on domain \"%s\""), data->resolver->service_type, data->resolver->service_name, data->resolver->domain); } g_simple_async_result_complete (data->simple); data->timeout_id = 0; resolve_data_free (data); return FALSE; } gboolean g_vfs_dns_sd_resolver_resolve_finish (GVfsDnsSdResolver *resolver, GAsyncResult *res, GError **error) { GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res); g_return_val_if_fail (G_VFS_IS_DNS_SD_RESOLVER (resolver), FALSE); g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_vfs_dns_sd_resolver_resolve); g_simple_async_result_propagate_error (simple, error); return g_simple_async_result_get_op_res_gboolean (simple); } void g_vfs_dns_sd_resolver_resolve (GVfsDnsSdResolver *resolver, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { ResolveData *data; GSimpleAsyncResult *simple; GError *error; g_return_if_fail (G_VFS_IS_DNS_SD_RESOLVER (resolver)); simple = g_simple_async_result_new (G_OBJECT (resolver), callback, user_data, g_vfs_dns_sd_resolver_resolve); if (resolver->is_resolved) { g_simple_async_result_set_op_res_gboolean (simple, TRUE); g_simple_async_result_complete (simple); g_object_unref (simple); goto out; } error = NULL; if (!ensure_avahi_resolver (resolver, &error)) { g_simple_async_result_set_from_error (simple, error); g_simple_async_result_complete (simple); g_object_unref (simple); g_error_free (error); goto out; } data = g_new0 (ResolveData, 1); data->resolver = resolver; data->simple = simple; data->timeout_id = g_timeout_add (resolver->timeout_msec, (GSourceFunc) service_resolver_timed_out, data); g_signal_connect (resolver, "changed", (GCallback) service_resolver_changed, data); out: ; } typedef struct { GMainLoop *loop; GError *error; gboolean ret; } ResolveDataSync; static void resolve_sync_cb (GVfsDnsSdResolver *resolver, GAsyncResult *res, ResolveDataSync *data) { data->ret = g_vfs_dns_sd_resolver_resolve_finish (resolver, res, &(data->error)); g_main_loop_quit (data->loop); } gboolean g_vfs_dns_sd_resolver_resolve_sync (GVfsDnsSdResolver *resolver, GCancellable *cancellable, GError **error) { ResolveDataSync *data; gboolean ret; g_return_val_if_fail (G_VFS_IS_DNS_SD_RESOLVER (resolver), FALSE); data = g_new0 (ResolveDataSync, 1); data->loop = g_main_loop_new (NULL, FALSE); g_vfs_dns_sd_resolver_resolve (resolver, cancellable, (GAsyncReadyCallback) resolve_sync_cb, data); g_main_loop_run (data->loop); ret = data->ret; if (data->error != NULL) g_propagate_error (error, data->error); g_main_loop_unref (data->loop); g_free (data); return ret; }