+/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
#include <poll.h>
#include <sys/ioctl.h>
+#if HAVE_LIBIDN2
+#include <idn2.h>
+#endif
+
#include "af-list.h"
#include "alloc-util.h"
#include "dirent-util.h"
static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
_cleanup_free_ char *h = NULL, *n = NULL;
+#if HAVE_LIBIDN2
+ _cleanup_free_ char *utf8 = NULL;
+#elif HAVE_LIBIDN
+ int k;
+#endif
char label[DNS_LABEL_MAX];
- const char *p;
- int r, k;
+ const char *p, *decoded;
+ int r;
assert(full_hostname);
assert(llmnr_hostname);
assert(mdns_hostname);
- /* Extract and normalize the first label of the locally
- * configured hostname, and check it's not "localhost". */
+ /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */
- h = gethostname_malloc();
- if (!h)
- return log_oom();
+ r = gethostname_strict(&h);
+ if (r < 0)
+ return log_debug_errno(r, "Can't determine system hostname: %m");
p = h;
- r = dns_label_unescape(&p, label, sizeof(label));
+ r = dns_label_unescape(&p, label, sizeof label);
if (r < 0)
return log_error_errno(r, "Failed to unescape host name: %m");
if (r == 0) {
- log_error("Couldn't find a single label in hosntame.");
+ log_error("Couldn't find a single label in hostname.");
return -EINVAL;
}
- k = dns_label_undo_idna(label, r, label, sizeof(label));
+#if HAVE_LIBIDN2
+ r = idn2_to_unicode_8z8z(label, &utf8, 0);
+ if (r != IDN2_OK)
+ return log_error("Failed to undo IDNA: %s", idn2_strerror(r));
+ assert(utf8_is_valid(utf8));
+
+ r = strlen(utf8);
+ decoded = utf8;
+#elif HAVE_LIBIDN
+ k = dns_label_undo_idna(label, r, label, sizeof label);
if (k < 0)
return log_error_errno(k, "Failed to undo IDNA: %m");
if (k > 0)
log_error("System hostname is not UTF-8 clean.");
return -EINVAL;
}
+ decoded = label;
+#else
+ decoded = label; /* no decoding */
+#endif
- r = dns_label_escape_new(label, r, &n);
+ r = dns_label_escape_new(decoded, r, &n);
if (r < 0)
return log_error_errno(r, "Failed to escape host name: %m");
return 0;
}
+static const char *fallback_hostname(void) {
+
+ /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be
+ * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */
+
+ if (is_localhost(FALLBACK_HOSTNAME))
+ return "linux";
+
+ return FALLBACK_HOSTNAME;
+}
+
+static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
+ _cleanup_free_ char *n = NULL, *m = NULL;
+ char label[DNS_LABEL_MAX], *h;
+ const char *p;
+ int r;
+
+ assert(full_hostname);
+ assert(llmnr_hostname);
+ assert(mdns_hostname);
+
+ p = fallback_hostname();
+ r = dns_label_unescape(&p, label, sizeof(label));
+ if (r < 0)
+ return log_error_errno(r, "Failed to unescape fallback host name: %m");
+
+ assert(r > 0); /* The fallback hostname must have at least one label */
+
+ r = dns_label_escape_new(label, r, &n);
+ if (r < 0)
+ return log_error_errno(r, "Failed to escape fallback hostname: %m");
+
+ r = dns_name_concat(n, "local", &m);
+ if (r < 0)
+ return log_error_errno(r, "Failed to concatenate mDNS hostname: %m");
+
+ h = strdup(fallback_hostname());
+ if (!h)
+ return log_oom();
+
+ *llmnr_hostname = n;
+ n = NULL;
+
+ *mdns_hostname = m;
+ m = NULL;
+
+ *full_hostname = h;
+
+ return 0;
+}
+
static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
_cleanup_free_ char *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL;
Manager *m = userdata;
r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
if (r < 0) {
- log_info("Defaulting to hostname 'linux'.");
+ log_info("Defaulting to hostname '%s'.", fallback_hostname());
- m->full_hostname = strdup("linux");
- if (!m->full_hostname)
- return log_oom();
-
- m->llmnr_hostname = strdup("linux");
- if (!m->llmnr_hostname)
- return log_oom();
-
- m->mdns_hostname = strdup("linux.local");
- if (!m->mdns_hostname)
- return log_oom();
+ r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
+ if (r < 0)
+ return r;
} else
log_info("Using system hostname '%s'.", m->full_hostname);
_cleanup_free_ char *buffer = NULL;
_cleanup_fclose_ FILE *f = NULL;
Manager *m = userdata;
+ DnsServer *server;
size_t size = 0;
DnsScope *scope;
+ Iterator i;
+ Link *l;
assert(s);
assert(si);
LIST_FOREACH(scopes, scope, m->dns_scopes)
dns_scope_dump(scope, f);
+ LIST_FOREACH(servers, server, m->dns_servers)
+ dns_server_dump(server, f);
+ LIST_FOREACH(servers, server, m->fallback_dns_servers)
+ dns_server_dump(server, f);
+ HASHMAP_FOREACH(l, m->links, i)
+ LIST_FOREACH(servers, server, l->dns_servers)
+ dns_server_dump(server, f);
+
if (fflush_and_check(f) < 0)
return log_oom();
return 0;
}
+static int manager_sigrtmin1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
+ Manager *m = userdata;
+
+ assert(s);
+ assert(si);
+ assert(m);
+
+ manager_reset_server_features(m);
+ return 0;
+}
+
int manager_new(Manager **ret) {
_cleanup_(manager_freep) Manager *m = NULL;
int r;
m->hostname_fd = -1;
m->llmnr_support = RESOLVE_SUPPORT_YES;
- m->mdns_support = RESOLVE_SUPPORT_NO;
+ m->mdns_support = RESOLVE_SUPPORT_YES;
m->dnssec_mode = DEFAULT_DNSSEC_MODE;
m->enable_cache = true;
m->dns_stub_listener_mode = DNS_STUB_LISTENER_UDP;
r = manager_parse_config_file(m);
if (r < 0)
- return r;
+ log_warning_errno(r, "Failed to parse configuration file: %m");
r = sd_event_default(&m->event);
if (r < 0)
(void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m);
(void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m);
+ (void) sd_event_add_signal(m->event, &m->sigrtmin1_event_source, SIGRTMIN+1, manager_sigrtmin1, m);
manager_cleanup_saved_user(m);
if (r < 0)
return r;
- r = manager_llmnr_start(m);
- if (r < 0)
- return r;
-
- r = manager_mdns_start(m);
- if (r < 0)
- return r;
-
return 0;
}
sd_event_source_unref(m->sigusr1_event_source);
sd_event_source_unref(m->sigusr2_event_source);
+ sd_event_source_unref(m->sigrtmin1_event_source);
sd_event_unref(m->event);
dns_resource_key_unref(m->llmnr_host_ipv4_key);
dns_resource_key_unref(m->llmnr_host_ipv6_key);
+ dns_resource_key_unref(m->mdns_host_ipv4_key);
+ dns_resource_key_unref(m->mdns_host_ipv6_key);
sd_event_source_unref(m->hostname_event_source);
safe_close(m->hostname_fd);
if (ms < 0)
return ms;
- r = dns_packet_new(&p, protocol, ms);
+ r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX);
if (r < 0)
return r;
if (l == 0)
return 0;
if (l < 0) {
- if (errno == EAGAIN || errno == EINTR)
+ if (IN_SET(errno, EAGAIN, EINTR))
return 0;
return -errno;
m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key);
m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key);
+ m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key);
+ m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key);
HASHMAP_FOREACH(l, m->links, i) {
link_add_rrs(l, true);
log_info("Flushed all caches.");
}
+void manager_reset_server_features(Manager *m) {
+ Iterator i;
+ Link *l;
+
+ dns_server_reset_features_all(m->dns_servers);
+ dns_server_reset_features_all(m->fallback_dns_servers);
+
+ HASHMAP_FOREACH(l, m->links, i)
+ dns_server_reset_features_all(l->dns_servers);
+
+ log_info("Resetting learnt feature levels on all servers.");
+}
+
void manager_cleanup_saved_user(Manager *m) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
projects / thirdparty / systemd.git / blobdiff