pnoltes commented on code in PR #495: URL: https://github.com/apache/celix/pull/495#discussion_r1139185433
########## bundles/remote_services/discovery_zeroconf/src/discovery_zeroconf_announcer.c: ########## @@ -0,0 +1,533 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ +#include <discovery_zeroconf_announcer.h> +#include <discovery_zeroconf_constants.h> +#include <dns_sd.h> +#include <endpoint_listener.h> +#include <remote_constants.h> +#include <celix_utils.h> +#include <celix_properties.h> +#include <celix_constants.h> +#include <celix_threads.h> +#include <celix_bundle_context.h> +#include <celix_string_hash_map.h> +#include <celix_array_list.h> +#include <celix_log_helper.h> +#include <celix_types.h> +#include <celix_errno.h> +#include <celix_build_assert.h> +#include <netinet/in.h> +#include <net/if.h> +#include <sys/eventfd.h> +#include <sys/select.h> +#include <sys/param.h> +#include <sys/socket.h> +#include <sys/ioctl.h> +#include <unistd.h> +#include <stdlib.h> +#include <assert.h> +#include <stdio.h> +#include <stdbool.h> +#include <stdint.h> +#include <stddef.h> +#include <string.h> +#include <errno.h> + + +#define DZC_MAX_CONFLICT_CNT 256 + +//According to rfc6763, Using TXT records larger than 1300 bytes is NOT RECOMMENDED +#define DZC_MAX_TXT_RECORD_SIZE 1300 + +struct discovery_zeroconf_announcer { + celix_bundle_context_t *ctx; + celix_log_helper_t *logHelper; + char fwUuid[64]; + endpoint_listener_t epListener; + long epListenerSvcId; + DNSServiceRef sharedRef; + int eventFd; + celix_thread_t refreshEPThread; + celix_thread_mutex_t mutex;//projects below + bool running; + celix_string_hash_map_t *endpoints;//key:endpoint id, val:announce_endpoint_entry_t* + celix_array_list_t *revokedEndpoints; +}; + +typedef struct announce_endpoint_entry { + celix_properties_t *properties; + DNSServiceRef registerRef; + unsigned int uid; + int ifIndex; + const char *serviceName; + char serviceType[64]; + bool announced; +}announce_endpoint_entry_t; + + +static void discoveryZeroconfAnnouncer_eventNotify(discovery_zeroconf_announcer_t *announcer); +static celix_status_t discoveryZeroconfAnnouncer_endpointAdded(void *handle, endpoint_description_t *endpoint, char *matchedFilter); +static celix_status_t discoveryZeroconfAnnouncer_endpointRemoved(void *handle, endpoint_description_t *endpoint, char *matchedFilter); +static void *discoveryZeroconfAnnouncer_refreshEndpointThread(void *data); + + +celix_status_t discoveryZeroconfAnnouncer_create(celix_bundle_context_t *ctx, celix_log_helper_t *logHelper, discovery_zeroconf_announcer_t **announcerOut) { + celix_status_t status = CELIX_SUCCESS; + discovery_zeroconf_announcer_t *announcer = calloc(1, sizeof(*announcer)); + assert(announcer != NULL); + announcer->ctx = ctx; + announcer->logHelper = logHelper; + announcer->sharedRef = NULL; + + announcer->eventFd = eventfd(0, 0); + if (announcer->eventFd < 0) { + status = CELIX_ERROR_MAKE(CELIX_FACILITY_CERRNO, errno); + celix_logHelper_fatal(logHelper, "Announcer: Failed to open event fd, %d.", errno); + goto eventfd_err; + } + + status = celixThreadMutex_create(&announcer->mutex, NULL); + if (status != CELIX_SUCCESS) { + celix_logHelper_fatal(logHelper, "Announcer: Failed to create mutex, %d.", status); + goto mutex_err; + } + + announcer->endpoints = celix_stringHashMap_create(); + assert(announcer->endpoints != NULL); + announcer->revokedEndpoints = celix_arrayList_create(); + assert(announcer->revokedEndpoints != NULL); + + const char *fwUuid = celix_bundleContext_getProperty(ctx, OSGI_FRAMEWORK_FRAMEWORK_UUID, NULL); + if (fwUuid == NULL || strlen(fwUuid) >= sizeof(announcer->fwUuid)) { + status = CELIX_BUNDLE_EXCEPTION; + celix_logHelper_fatal(logHelper, "Announcer: Failed to get framework uuid."); + goto fw_uuid_err; + } + strcpy(announcer->fwUuid, fwUuid); + + announcer->epListener.handle = announcer; + announcer->epListener.endpointAdded = discoveryZeroconfAnnouncer_endpointAdded; + announcer->epListener.endpointRemoved = discoveryZeroconfAnnouncer_endpointRemoved; + char scope[256] = {0}; + (void)snprintf(scope, sizeof(scope), "(&(%s=*)(%s=%s))", OSGI_FRAMEWORK_OBJECTCLASS, OSGI_RSA_ENDPOINT_FRAMEWORK_UUID, fwUuid); + + celix_properties_t *props = celix_properties_create(); + assert(props != NULL); + celix_properties_set(props, "DISCOVERY", "true"); + celix_properties_set(props, (char *) OSGI_ENDPOINT_LISTENER_SCOPE, scope); + celix_service_registration_options_t opt = CELIX_EMPTY_SERVICE_REGISTRATION_OPTIONS; + opt.serviceName = OSGI_ENDPOINT_LISTENER_SERVICE; + opt.properties = props; + opt.svc = &announcer->epListener; + announcer->epListenerSvcId = celix_bundleContext_registerServiceWithOptionsAsync(ctx, &opt); + if (announcer->epListenerSvcId < 0) { + status = CELIX_BUNDLE_EXCEPTION; + celix_logHelper_fatal(logHelper, "Announcer: Failed to register endpoint listener."); + goto ep_listener_err; + } + + announcer->running = true; + status = celixThread_create(&announcer->refreshEPThread, NULL, discoveryZeroconfAnnouncer_refreshEndpointThread, announcer); + if (status != CELIX_SUCCESS) { + celix_logHelper_fatal(logHelper, "Announcer: Failed to create refreshing endpoint thread, %d.", status); + goto announce_ep_thread_err; + } + celixThread_setName(&announcer->refreshEPThread, "DiscAnnouncer"); + + *announcerOut = announcer; + return CELIX_SUCCESS; +announce_ep_thread_err: + celix_bundleContext_unregisterServiceAsync(ctx, announcer->epListenerSvcId, NULL, NULL); + celix_bundleContext_waitForAsyncUnregistration(ctx, announcer->epListenerSvcId); +ep_listener_err: +fw_uuid_err: + celix_arrayList_destroy(announcer->revokedEndpoints); + celix_stringHashMap_destroy(announcer->endpoints); + celixThreadMutex_destroy(&announcer->mutex); +mutex_err: + close(announcer->eventFd); +eventfd_err: + free(announcer); + return status; +} + +void discoveryZeroconfAnnouncer_destroy(discovery_zeroconf_announcer_t *announcer) { + celixThreadMutex_lock(&announcer->mutex); + announcer->running= false; + celixThreadMutex_unlock(&announcer->mutex); + discoveryZeroconfAnnouncer_eventNotify(announcer); + celixThread_join(announcer->refreshEPThread, NULL); + celix_bundleContext_unregisterServiceAsync(announcer->ctx, announcer->epListenerSvcId, NULL, NULL); + celix_bundleContext_waitForAsyncUnregistration(announcer->ctx, announcer->epListenerSvcId); + + announce_endpoint_entry_t *entry = NULL; + int size = celix_arrayList_size(announcer->revokedEndpoints); + for (int i = 0; i < size; ++i) { + entry = (announce_endpoint_entry_t *)celix_arrayList_get(announcer->revokedEndpoints, i); + celix_properties_destroy(entry->properties); + free(entry); + } + celix_arrayList_destroy(announcer->revokedEndpoints); + + CELIX_STRING_HASH_MAP_ITERATE(announcer->endpoints,iter) { + entry = (announce_endpoint_entry_t *) iter.value.ptrValue; + celix_properties_destroy(entry->properties); + free(entry); + } + celix_stringHashMap_destroy(announcer->endpoints); + + celixThreadMutex_destroy(&announcer->mutex); + close(announcer->eventFd); + free(announcer); + return; +} + +static void discoveryZeroconfAnnouncer_eventNotify(discovery_zeroconf_announcer_t *announcer) { + eventfd_t val = 1; + eventfd_write(announcer->eventFd, val); + return; +} + +static bool isLoopBackNetInterface(int ifIndex) { + if (ifIndex <= 0) { + return false; + } + bool loopBack = false; + int fd = socket(AF_INET, SOCK_DGRAM, 0); + if (fd >= 0) { + struct ifreq ifr; + memset(&ifr, 0, sizeof(ifr)); + if (if_indextoname((unsigned int)ifIndex, ifr.ifr_name) != NULL) { + if (ioctl(fd, SIOCGIFFLAGS, &ifr) == 0) { + loopBack = !!(ifr.ifr_ifru.ifru_flags & IFF_LOOPBACK); + } + } + close(fd); + } + return loopBack; +} + +static celix_status_t discoveryZeroconfAnnouncer_endpointAdded(void *handle, endpoint_description_t *endpoint, char *matchedFilter) { + (void)matchedFilter;//unused + celix_status_t status = CELIX_SUCCESS; + discovery_zeroconf_announcer_t *announcer = (discovery_zeroconf_announcer_t *)handle; + assert(announcer != NULL); + if (endpointDescription_isInvalid(endpoint)) { + celix_logHelper_error(announcer->logHelper, "Announcer: Endpoint is invalid."); + return CELIX_ILLEGAL_ARGUMENT; + } + + celix_logHelper_info(announcer->logHelper, "Announcer: Add endpoint for %s(%s).", endpoint->serviceName, endpoint->id); + + announce_endpoint_entry_t *entry = calloc(1, sizeof(*entry)); + assert(entry != NULL); + entry->registerRef = NULL; + entry->announced = false; + entry->uid = celix_utils_stringHash(endpoint->id); Review Comment: If the usage of mDNS service instance is possible I think this is better, because a hash is not guaranteed to be unique. -- This is an automated message from the Apache Git Service. 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