369 lines
11 KiB
C
369 lines
11 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
|
|
|
|
#include "conf-files.h"
|
|
#include "conf-parser.h"
|
|
#include "def.h"
|
|
#include "resolved-dnssd.h"
|
|
#include "resolved-dns-rr.h"
|
|
#include "resolved-manager.h"
|
|
#include "resolved-conf.h"
|
|
#include "specifier.h"
|
|
#include "strv.h"
|
|
|
|
#define DNSSD_SERVICE_DIRS ((const char* const*) CONF_PATHS_STRV("systemd/dnssd"))
|
|
|
|
DnssdTxtData *dnssd_txtdata_free(DnssdTxtData *txt_data) {
|
|
if (!txt_data)
|
|
return NULL;
|
|
|
|
dns_resource_record_unref(txt_data->rr);
|
|
dns_txt_item_free_all(txt_data->txt);
|
|
|
|
return mfree(txt_data);
|
|
}
|
|
|
|
DnssdTxtData *dnssd_txtdata_free_all(DnssdTxtData *txt_data) {
|
|
DnssdTxtData *next;
|
|
|
|
if (!txt_data)
|
|
return NULL;
|
|
|
|
next = txt_data->items_next;
|
|
|
|
dnssd_txtdata_free(txt_data);
|
|
|
|
return dnssd_txtdata_free_all(next);
|
|
}
|
|
|
|
DnssdService *dnssd_service_free(DnssdService *service) {
|
|
if (!service)
|
|
return NULL;
|
|
|
|
if (service->manager)
|
|
hashmap_remove(service->manager->dnssd_services, service->name);
|
|
|
|
dns_resource_record_unref(service->ptr_rr);
|
|
dns_resource_record_unref(service->srv_rr);
|
|
|
|
dnssd_txtdata_free_all(service->txt_data_items);
|
|
|
|
free(service->filename);
|
|
free(service->name);
|
|
free(service->type);
|
|
free(service->name_template);
|
|
|
|
return mfree(service);
|
|
}
|
|
|
|
static int dnssd_service_load(Manager *manager, const char *filename) {
|
|
_cleanup_(dnssd_service_freep) DnssdService *service = NULL;
|
|
_cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL;
|
|
char *d;
|
|
const char *dropin_dirname;
|
|
int r;
|
|
|
|
assert(manager);
|
|
assert(filename);
|
|
|
|
service = new0(DnssdService, 1);
|
|
if (!service)
|
|
return log_oom();
|
|
|
|
service->filename = strdup(filename);
|
|
if (!service->filename)
|
|
return log_oom();
|
|
|
|
service->name = strdup(basename(filename));
|
|
if (!service->name)
|
|
return log_oom();
|
|
|
|
d = endswith(service->name, ".dnssd");
|
|
if (!d)
|
|
return -EINVAL;
|
|
|
|
assert(streq(d, ".dnssd"));
|
|
|
|
*d = '\0';
|
|
|
|
dropin_dirname = strjoina(service->name, ".dnssd.d");
|
|
|
|
r = config_parse_many(
|
|
filename, DNSSD_SERVICE_DIRS, dropin_dirname,
|
|
"Service\0",
|
|
config_item_perf_lookup, resolved_dnssd_gperf_lookup,
|
|
CONFIG_PARSE_WARN,
|
|
service,
|
|
NULL);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (!service->name_template)
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"%s doesn't define service instance name",
|
|
service->name);
|
|
|
|
if (!service->type)
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"%s doesn't define service type",
|
|
service->name);
|
|
|
|
if (LIST_IS_EMPTY(service->txt_data_items)) {
|
|
txt_data = new0(DnssdTxtData, 1);
|
|
if (!txt_data)
|
|
return log_oom();
|
|
|
|
r = dns_txt_item_new_empty(&txt_data->txt);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
LIST_PREPEND(items, service->txt_data_items, txt_data);
|
|
txt_data = NULL;
|
|
}
|
|
|
|
r = hashmap_ensure_allocated(&manager->dnssd_services, &string_hash_ops);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = hashmap_put(manager->dnssd_services, service->name, service);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
service->manager = manager;
|
|
|
|
r = dnssd_update_rrs(service);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
service = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int specifier_dnssd_host_name(char specifier, const void *data, const void *userdata, char **ret) {
|
|
DnssdService *s = (DnssdService *) userdata;
|
|
char *n;
|
|
|
|
assert(s);
|
|
assert(s->manager);
|
|
assert(s->manager->llmnr_hostname);
|
|
|
|
n = strdup(s->manager->llmnr_hostname);
|
|
if (!n)
|
|
return -ENOMEM;
|
|
|
|
*ret = n;
|
|
return 0;
|
|
}
|
|
|
|
int dnssd_render_instance_name(DnssdService *s, char **ret_name) {
|
|
static const Specifier specifier_table[] = {
|
|
{ 'a', specifier_architecture, NULL },
|
|
{ 'b', specifier_boot_id, NULL },
|
|
{ 'B', specifier_os_build_id, NULL },
|
|
{ 'H', specifier_dnssd_host_name, NULL },
|
|
{ 'm', specifier_machine_id, NULL },
|
|
{ 'o', specifier_os_id, NULL },
|
|
{ 'v', specifier_kernel_release, NULL },
|
|
{ 'w', specifier_os_version_id, NULL },
|
|
{ 'W', specifier_os_variant_id, NULL },
|
|
{}
|
|
};
|
|
_cleanup_free_ char *name = NULL;
|
|
int r;
|
|
|
|
assert(s);
|
|
assert(s->name_template);
|
|
|
|
r = specifier_printf(s->name_template, specifier_table, s, &name);
|
|
if (r < 0)
|
|
return log_debug_errno(r, "Failed to replace specifiers: %m");
|
|
|
|
if (!dns_service_name_is_valid(name))
|
|
return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"Service instance name '%s' is invalid.",
|
|
name);
|
|
|
|
*ret_name = TAKE_PTR(name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dnssd_load(Manager *manager) {
|
|
_cleanup_strv_free_ char **files = NULL;
|
|
char **f;
|
|
int r;
|
|
|
|
assert(manager);
|
|
|
|
if (manager->mdns_support != RESOLVE_SUPPORT_YES)
|
|
return 0;
|
|
|
|
r = conf_files_list_strv(&files, ".dnssd", NULL, 0, DNSSD_SERVICE_DIRS);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to enumerate .dnssd files: %m");
|
|
|
|
STRV_FOREACH_BACKWARDS(f, files) {
|
|
r = dnssd_service_load(manager, *f);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to load '%s': %m", *f);;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dnssd_update_rrs(DnssdService *s) {
|
|
_cleanup_free_ char *n = NULL;
|
|
_cleanup_free_ char *service_name = NULL;
|
|
_cleanup_free_ char *full_name = NULL;
|
|
DnssdTxtData *txt_data;
|
|
int r;
|
|
|
|
assert(s);
|
|
assert(s->txt_data_items);
|
|
assert(s->manager);
|
|
|
|
s->ptr_rr = dns_resource_record_unref(s->ptr_rr);
|
|
s->srv_rr = dns_resource_record_unref(s->srv_rr);
|
|
LIST_FOREACH(items, txt_data, s->txt_data_items)
|
|
txt_data->rr = dns_resource_record_unref(txt_data->rr);
|
|
|
|
r = dnssd_render_instance_name(s, &n);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dns_name_concat(s->type, "local", 0, &service_name);
|
|
if (r < 0)
|
|
return r;
|
|
r = dns_name_concat(n, service_name, 0, &full_name);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
LIST_FOREACH(items, txt_data, s->txt_data_items) {
|
|
txt_data->rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_TXT,
|
|
full_name);
|
|
if (!txt_data->rr)
|
|
goto oom;
|
|
|
|
txt_data->rr->ttl = MDNS_DEFAULT_TTL;
|
|
txt_data->rr->txt.items = dns_txt_item_copy(txt_data->txt);
|
|
if (!txt_data->rr->txt.items)
|
|
goto oom;
|
|
}
|
|
|
|
s->ptr_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_PTR,
|
|
service_name);
|
|
if (!s->ptr_rr)
|
|
goto oom;
|
|
|
|
s->ptr_rr->ttl = MDNS_DEFAULT_TTL;
|
|
s->ptr_rr->ptr.name = strdup(full_name);
|
|
if (!s->ptr_rr->ptr.name)
|
|
goto oom;
|
|
|
|
s->srv_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_SRV,
|
|
full_name);
|
|
if (!s->srv_rr)
|
|
goto oom;
|
|
|
|
s->srv_rr->ttl = MDNS_DEFAULT_TTL;
|
|
s->srv_rr->srv.priority = s->priority;
|
|
s->srv_rr->srv.weight = s->weight;
|
|
s->srv_rr->srv.port = s->port;
|
|
s->srv_rr->srv.name = strdup(s->manager->mdns_hostname);
|
|
if (!s->srv_rr->srv.name)
|
|
goto oom;
|
|
|
|
return 0;
|
|
|
|
oom:
|
|
LIST_FOREACH(items, txt_data, s->txt_data_items)
|
|
txt_data->rr = dns_resource_record_unref(txt_data->rr);
|
|
s->ptr_rr = dns_resource_record_unref(s->ptr_rr);
|
|
s->srv_rr = dns_resource_record_unref(s->srv_rr);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
int dnssd_txt_item_new_from_string(const char *key, const char *value, DnsTxtItem **ret_item) {
|
|
size_t length;
|
|
DnsTxtItem *i;
|
|
|
|
length = strlen(key);
|
|
|
|
if (!isempty(value))
|
|
length += strlen(value) + 1; /* length of value plus '=' */
|
|
|
|
i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */
|
|
if (!i)
|
|
return -ENOMEM;
|
|
|
|
memcpy(i->data, key, strlen(key));
|
|
if (!isempty(value)) {
|
|
memcpy(i->data + strlen(key), "=", 1);
|
|
memcpy(i->data + strlen(key) + 1, value, strlen(value));
|
|
}
|
|
i->length = length;
|
|
|
|
*ret_item = TAKE_PTR(i);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dnssd_txt_item_new_from_data(const char *key, const void *data, const size_t size, DnsTxtItem **ret_item) {
|
|
size_t length;
|
|
DnsTxtItem *i;
|
|
|
|
length = strlen(key);
|
|
|
|
if (size > 0)
|
|
length += size + 1; /* size of date plus '=' */
|
|
|
|
i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */
|
|
if (!i)
|
|
return -ENOMEM;
|
|
|
|
memcpy(i->data, key, strlen(key));
|
|
if (size > 0) {
|
|
memcpy(i->data + strlen(key), "=", 1);
|
|
memcpy(i->data + strlen(key) + 1, data, size);
|
|
}
|
|
i->length = length;
|
|
|
|
*ret_item = TAKE_PTR(i);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void dnssd_signal_conflict(Manager *manager, const char *name) {
|
|
DnssdService *s;
|
|
int r;
|
|
|
|
HASHMAP_FOREACH(s, manager->dnssd_services) {
|
|
if (s->withdrawn)
|
|
continue;
|
|
|
|
if (dns_name_equal(dns_resource_key_name(s->srv_rr->key), name)) {
|
|
_cleanup_free_ char *path = NULL;
|
|
|
|
s->withdrawn = true;
|
|
|
|
r = sd_bus_path_encode("/org/freedesktop/resolve1/dnssd", s->name, &path);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Can't get D-BUS object path: %m");
|
|
return;
|
|
}
|
|
|
|
r = sd_bus_emit_signal(manager->bus,
|
|
path,
|
|
"org.freedesktop.resolve1.DnssdService",
|
|
"Conflicted",
|
|
NULL);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Cannot emit signal: %m");
|
|
return;
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|