385 lines
11 KiB
C
385 lines
11 KiB
C
/***
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This file is part of systemd.
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Copyright 2017 Dmitry Rozhkov
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "conf-files.h"
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#include "conf-parser.h"
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#include "resolved-dnssd.h"
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#include "resolved-dns-rr.h"
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#include "resolved-manager.h"
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#include "specifier.h"
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#include "strv.h"
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const char* const dnssd_service_dirs[] = {
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"/etc/systemd/dnssd",
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"/run/systemd/dnssd",
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"/usr/lib/systemd/dnssd",
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#ifdef HAVE_SPLIT_USR
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"/lib/systemd/dnssd",
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#endif
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NULL
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};
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DnssdTxtData *dnssd_txtdata_free(DnssdTxtData *txt_data) {
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if (!txt_data)
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return NULL;
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dns_resource_record_unref(txt_data->rr);
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dns_txt_item_free_all(txt_data->txt);
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return mfree(txt_data);
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}
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DnssdTxtData *dnssd_txtdata_free_all(DnssdTxtData *txt_data) {
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DnssdTxtData *next;
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if (!txt_data)
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return NULL;
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next = txt_data->items_next;
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dnssd_txtdata_free(txt_data);
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return dnssd_txtdata_free_all(next);
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}
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DnssdService *dnssd_service_free(DnssdService *service) {
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if (!service)
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return NULL;
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if (service->manager)
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hashmap_remove(service->manager->dnssd_services, service->name);
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dns_resource_record_unref(service->ptr_rr);
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dns_resource_record_unref(service->srv_rr);
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dnssd_txtdata_free_all(service->txt_data_items);
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free(service->filename);
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free(service->name);
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free(service->type);
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free(service->name_template);
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return mfree(service);
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}
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static int dnssd_service_load(Manager *manager, const char *filename) {
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_cleanup_(dnssd_service_freep) DnssdService *service = NULL;
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_cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL;
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char *d;
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const char *dropin_dirname;
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int r;
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assert(manager);
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assert(filename);
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service = new0(DnssdService, 1);
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if (!service)
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return log_oom();
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service->filename = strdup(filename);
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if (!service->filename)
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return log_oom();
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service->name = strdup(basename(filename));
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if (!service->name)
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return log_oom();
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d = endswith(service->name, ".dnssd");
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if (!d)
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return -EINVAL;
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assert(streq(d, ".dnssd"));
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*d = '\0';
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dropin_dirname = strjoina(service->name, ".dnssd.d");
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r = config_parse_many(filename, dnssd_service_dirs, dropin_dirname,
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"Service\0",
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config_item_perf_lookup, resolved_dnssd_gperf_lookup,
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false, service);
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if (r < 0)
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return r;
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if (!service->name_template) {
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log_error("%s doesn't define service instance name", service->name);
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return -EINVAL;
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}
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if (!service->type) {
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log_error("%s doesn't define service type", service->name);
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return -EINVAL;
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}
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if (LIST_IS_EMPTY(service->txt_data_items)) {
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txt_data = new0(DnssdTxtData, 1);
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if (!txt_data)
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return log_oom();
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r = dns_txt_item_new_empty(&txt_data->txt);
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if (r < 0)
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return r;
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LIST_PREPEND(items, service->txt_data_items, txt_data);
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txt_data = NULL;
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}
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r = hashmap_ensure_allocated(&manager->dnssd_services, &string_hash_ops);
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if (r < 0)
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return r;
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r = hashmap_put(manager->dnssd_services, service->name, service);
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if (r < 0)
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return r;
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service->manager = manager;
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r = dnssd_update_rrs(service);
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if (r < 0)
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return r;
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service = NULL;
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return 0;
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}
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static int specifier_dnssd_host_name(char specifier, void *data, void *userdata, char **ret) {
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DnssdService *s = (DnssdService *) userdata;
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char *n;
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assert(s);
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assert(s->manager);
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assert(s->manager->llmnr_hostname);
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n = strdup(s->manager->llmnr_hostname);
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if (!n)
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return -ENOMEM;
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*ret = n;
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return 0;
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}
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int dnssd_render_instance_name(DnssdService *s, char **ret_name) {
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static const Specifier specifier_table[] = {
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{ 'b', specifier_boot_id, NULL },
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{ 'H', specifier_dnssd_host_name, NULL },
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{ 'm', specifier_machine_id, NULL },
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{ 'v', specifier_kernel_release, NULL },
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{}
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};
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_cleanup_free_ char *name = NULL;
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int r;
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assert(s);
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assert(s->name_template);
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r = specifier_printf(s->name_template, specifier_table, s, &name);
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if (r < 0)
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return log_debug_errno(r, "Failed to replace specifiers: %m");
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if (!dns_service_name_is_valid(name)) {
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log_debug("Service instance name '%s' is invalid.", name);
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return -EINVAL;
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}
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*ret_name = TAKE_PTR(name);
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return 0;
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}
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int dnssd_load(Manager *manager) {
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_cleanup_strv_free_ char **files = NULL;
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char **f;
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int r;
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assert(manager);
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if (manager->mdns_support != RESOLVE_SUPPORT_YES)
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return 0;
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r = conf_files_list_strv(&files, ".dnssd", NULL, 0, dnssd_service_dirs);
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if (r < 0)
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return log_error_errno(r, "Failed to enumerate .dnssd files: %m");
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STRV_FOREACH_BACKWARDS(f, files) {
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r = dnssd_service_load(manager, *f);
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if (r < 0)
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log_warning_errno(r, "Failed to load '%s': %m", *f);;
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}
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return 0;
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}
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int dnssd_update_rrs(DnssdService *s) {
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_cleanup_free_ char *n = NULL;
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_cleanup_free_ char *service_name = NULL;
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_cleanup_free_ char *full_name = NULL;
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DnssdTxtData *txt_data;
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int r;
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assert(s);
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assert(s->txt_data_items);
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assert(s->manager);
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s->ptr_rr = dns_resource_record_unref(s->ptr_rr);
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s->srv_rr = dns_resource_record_unref(s->srv_rr);
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LIST_FOREACH(items, txt_data, s->txt_data_items)
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txt_data->rr = dns_resource_record_unref(txt_data->rr);
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r = dnssd_render_instance_name(s, &n);
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if (r < 0)
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return r;
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r = dns_name_concat(s->type, "local", &service_name);
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if (r < 0)
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return r;
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r = dns_name_concat(n, service_name, &full_name);
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if (r < 0)
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return r;
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LIST_FOREACH(items, txt_data, s->txt_data_items) {
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txt_data->rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_TXT,
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full_name);
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if (!txt_data->rr)
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goto oom;
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txt_data->rr->ttl = MDNS_DEFAULT_TTL;
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txt_data->rr->txt.items = dns_txt_item_copy(txt_data->txt);
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if (!txt_data->rr->txt.items)
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goto oom;
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}
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s->ptr_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_PTR,
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service_name);
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if (!s->ptr_rr)
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goto oom;
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s->ptr_rr->ttl = MDNS_DEFAULT_TTL;
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s->ptr_rr->ptr.name = strdup(full_name);
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if (!s->ptr_rr->ptr.name)
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goto oom;
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s->srv_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_SRV,
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full_name);
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if (!s->srv_rr)
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goto oom;
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s->srv_rr->ttl = MDNS_DEFAULT_TTL;
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s->srv_rr->srv.priority = s->priority;
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s->srv_rr->srv.weight = s->weight;
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s->srv_rr->srv.port = s->port;
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s->srv_rr->srv.name = strdup(s->manager->mdns_hostname);
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if (!s->srv_rr->srv.name)
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goto oom;
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return 0;
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oom:
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LIST_FOREACH(items, txt_data, s->txt_data_items)
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txt_data->rr = dns_resource_record_unref(txt_data->rr);
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s->ptr_rr = dns_resource_record_unref(s->ptr_rr);
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s->srv_rr = dns_resource_record_unref(s->srv_rr);
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return -ENOMEM;
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}
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int dnssd_txt_item_new_from_string(const char *key, const char *value, DnsTxtItem **ret_item) {
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size_t length;
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DnsTxtItem *i;
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length = strlen(key);
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if (!isempty(value))
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length += strlen(value) + 1; /* length of value plus '=' */
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i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */
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if (!i)
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return -ENOMEM;
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memcpy(i->data, key, strlen(key));
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if (!isempty(value)) {
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memcpy(i->data + strlen(key), "=", 1);
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memcpy(i->data + strlen(key) + 1, value, strlen(value));
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}
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i->length = length;
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*ret_item = TAKE_PTR(i);
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return 0;
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}
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int dnssd_txt_item_new_from_data(const char *key, const void *data, const size_t size, DnsTxtItem **ret_item) {
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size_t length;
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DnsTxtItem *i;
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length = strlen(key);
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if (size > 0)
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length += size + 1; /* size of date plus '=' */
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i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */
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if (!i)
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return -ENOMEM;
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memcpy(i->data, key, strlen(key));
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if (size > 0) {
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memcpy(i->data + strlen(key), "=", 1);
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memcpy(i->data + strlen(key) + 1, data, size);
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}
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i->length = length;
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*ret_item = TAKE_PTR(i);
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return 0;
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}
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void dnssd_signal_conflict(Manager *manager, const char *name) {
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Iterator i;
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DnssdService *s;
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int r;
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HASHMAP_FOREACH(s, manager->dnssd_services, i) {
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if (s->withdrawn)
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continue;
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if (dns_name_equal(dns_resource_key_name(s->srv_rr->key), name)) {
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_cleanup_free_ char *path = NULL;
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s->withdrawn = true;
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r = sd_bus_path_encode("/org/freedesktop/resolve1/dnssd", s->name, &path);
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if (r < 0) {
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log_error_errno(r, "Can't get D-BUS object path: %m");
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return;
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}
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r = sd_bus_emit_signal(manager->bus,
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path,
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"org.freedesktop.resolve1.DnssdService",
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"Conflicted",
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NULL);
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if (r < 0) {
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log_error_errno(r, "Cannot emit signal: %m");
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return;
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}
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break;
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}
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}
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}
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