1 files changed, 101 insertions, 0 deletions
diff --git a/src/network/networkd-ntp.c b/src/network/networkd-ntp.c
new file mode 100644
index 0000000..e764fea
--- /dev/null
+++ b/src/network/networkd-ntp.c
@@ -0,0 +1,101 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "dns-domain.h"
+#include "networkd-network.h"
+#include "networkd-ntp.h"
+#include "parse-util.h"
+#include "strv.h"
+
+/* Let's assume that anything above this number is a user misconfiguration. */
+#define MAX_NTP_SERVERS 128U
+
+bool link_get_use_ntp(Link *link, NetworkConfigSource proto) {
+        int n, c;
+
+        assert(link);
+
+        if (!link->network)
+                return false;
+
+        switch (proto) {
+        case NETWORK_CONFIG_SOURCE_DHCP4:
+                n = link->network->dhcp_use_ntp;
+                c = link->network->compat_dhcp_use_ntp;
+                break;
+        case NETWORK_CONFIG_SOURCE_DHCP6:
+                n = link->network->dhcp6_use_ntp;
+                c = link->network->compat_dhcp_use_ntp;
+                break;
+        default:
+                assert_not_reached();
+        }
+
+        /* If per-network and per-protocol setting is specified, use it. */
+        if (n >= 0)
+                return n;
+
+        /* If compat setting is specified, use it. */
+        if (c >= 0)
+                return c;
+
+        /* Otherwise, defaults to yes. */
+        return true;
+}
+
+int config_parse_ntp(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        char ***l = ASSERT_PTR(data);
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+
+        if (isempty(rvalue)) {
+                *l = strv_free(*l);
+                return 0;
+        }
+
+        for (const char *p = rvalue;;) {
+                _cleanup_free_ char *w = NULL;
+
+                r = extract_first_word(&p, &w, NULL, 0);
+                if (r == -ENOMEM)
+                        return log_oom();
+                if (r < 0) {
+                        log_syntax(unit, LOG_WARNING, filename, line, r,
+                                   "Failed to extract NTP server name, ignoring: %s", rvalue);
+                        return 0;
+                }
+                if (r == 0)
+                        return 0;
+
+                r = dns_name_is_valid_or_address(w);
+                if (r <= 0) {
+                        log_syntax(unit, LOG_WARNING, filename, line, r,
+                                   "%s is not a valid domain name or IP address, ignoring.", w);
+                        continue;
+                }
+
+                if (strv_length(*l) > MAX_NTP_SERVERS) {
+                        log_syntax(unit, LOG_WARNING, filename, line, 0,
+                                   "More than %u NTP servers specified, ignoring \"%s\" and any subsequent entries.",
+                                   MAX_NTP_SERVERS, w);
+                        return 0;
+                }
+
+                r = strv_consume(l, TAKE_PTR(w));
+                if (r < 0)
+                        return log_oom();
+        }
+}