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-rw-r--r--src/resolve/resolved-conf.c403
1 files changed, 403 insertions, 0 deletions
diff --git a/src/resolve/resolved-conf.c b/src/resolve/resolved-conf.c
new file mode 100644
index 0000000..79e388f
--- /dev/null
+++ b/src/resolve/resolved-conf.c
@@ -0,0 +1,403 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include "alloc-util.h"
+#include "conf-parser.h"
+#include "def.h"
+#include "extract-word.h"
+#include "hexdecoct.h"
+#include "parse-util.h"
+#include "resolved-conf.h"
+#include "resolved-dnssd.h"
+#include "specifier.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "utf8.h"
+
+DEFINE_CONFIG_PARSE_ENUM(config_parse_dns_stub_listener_mode, dns_stub_listener_mode, DnsStubListenerMode, "Failed to parse DNS stub listener mode setting");
+
+static const char* const dns_stub_listener_mode_table[_DNS_STUB_LISTENER_MODE_MAX] = {
+ [DNS_STUB_LISTENER_NO] = "no",
+ [DNS_STUB_LISTENER_UDP] = "udp",
+ [DNS_STUB_LISTENER_TCP] = "tcp",
+ [DNS_STUB_LISTENER_YES] = "yes",
+};
+DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(dns_stub_listener_mode, DnsStubListenerMode, DNS_STUB_LISTENER_YES);
+
+int manager_add_dns_server_by_string(Manager *m, DnsServerType type, const char *word) {
+ union in_addr_union address;
+ int family, r, ifindex = 0;
+ DnsServer *s;
+
+ assert(m);
+ assert(word);
+
+ r = in_addr_ifindex_from_string_auto(word, &family, &address, &ifindex);
+ if (r < 0)
+ return r;
+
+ /* Silently filter out 0.0.0.0 and 127.0.0.53 (our own stub DNS listener) */
+ if (!dns_server_address_valid(family, &address))
+ return 0;
+
+ /* Filter out duplicates */
+ s = dns_server_find(manager_get_first_dns_server(m, type), family, &address, ifindex);
+ if (s) {
+ /*
+ * Drop the marker. This is used to find the servers
+ * that ceased to exist, see
+ * manager_mark_dns_servers() and
+ * manager_flush_marked_dns_servers().
+ */
+ dns_server_move_back_and_unmark(s);
+ return 0;
+ }
+
+ return dns_server_new(m, NULL, type, NULL, family, &address, ifindex);
+}
+
+int manager_parse_dns_server_string_and_warn(Manager *m, DnsServerType type, const char *string) {
+ int r;
+
+ assert(m);
+ assert(string);
+
+ for (;;) {
+ _cleanup_free_ char *word = NULL;
+
+ r = extract_first_word(&string, &word, NULL, 0);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ r = manager_add_dns_server_by_string(m, type, word);
+ if (r < 0)
+ log_warning_errno(r, "Failed to add DNS server address '%s', ignoring: %m", word);
+ }
+
+ return 0;
+}
+
+int manager_add_search_domain_by_string(Manager *m, const char *domain) {
+ DnsSearchDomain *d;
+ bool route_only;
+ int r;
+
+ assert(m);
+ assert(domain);
+
+ route_only = *domain == '~';
+ if (route_only)
+ domain++;
+
+ if (dns_name_is_root(domain) || streq(domain, "*")) {
+ route_only = true;
+ domain = ".";
+ }
+
+ r = dns_search_domain_find(m->search_domains, domain, &d);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ dns_search_domain_move_back_and_unmark(d);
+ else {
+ r = dns_search_domain_new(m, &d, DNS_SEARCH_DOMAIN_SYSTEM, NULL, domain);
+ if (r < 0)
+ return r;
+ }
+
+ d->route_only = route_only;
+ return 0;
+}
+
+int manager_parse_search_domains_and_warn(Manager *m, const char *string) {
+ int r;
+
+ assert(m);
+ assert(string);
+
+ for (;;) {
+ _cleanup_free_ char *word = NULL;
+
+ r = extract_first_word(&string, &word, NULL, EXTRACT_QUOTES);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ r = manager_add_search_domain_by_string(m, word);
+ if (r < 0)
+ log_warning_errno(r, "Failed to add search domain '%s', ignoring: %m", word);
+ }
+
+ return 0;
+}
+
+int config_parse_dns_servers(
+ 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) {
+
+ Manager *m = userdata;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(m);
+
+ if (isempty(rvalue))
+ /* Empty assignment means clear the list */
+ dns_server_unlink_all(manager_get_first_dns_server(m, ltype));
+ else {
+ /* Otherwise, add to the list */
+ r = manager_parse_dns_server_string_and_warn(m, ltype, rvalue);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse DNS server string '%s'. Ignoring.", rvalue);
+ return 0;
+ }
+ }
+
+ /* If we have a manual setting, then we stop reading
+ * /etc/resolv.conf */
+ if (ltype == DNS_SERVER_SYSTEM)
+ m->read_resolv_conf = false;
+ if (ltype == DNS_SERVER_FALLBACK)
+ m->need_builtin_fallbacks = false;
+
+ return 0;
+}
+
+int config_parse_search_domains(
+ 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) {
+
+ Manager *m = userdata;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(m);
+
+ if (isempty(rvalue))
+ /* Empty assignment means clear the list */
+ dns_search_domain_unlink_all(m->search_domains);
+ else {
+ /* Otherwise, add to the list */
+ r = manager_parse_search_domains_and_warn(m, rvalue);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse search domains string '%s'. Ignoring.", rvalue);
+ return 0;
+ }
+ }
+
+ /* If we have a manual setting, then we stop reading
+ * /etc/resolv.conf */
+ m->read_resolv_conf = false;
+
+ return 0;
+}
+
+int config_parse_dnssd_service_name(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) {
+ static const Specifier specifier_table[] = {
+ { 'b', specifier_boot_id, NULL },
+ { 'H', specifier_host_name, NULL },
+ { 'm', specifier_machine_id, NULL },
+ { 'v', specifier_kernel_release, NULL },
+ {}
+ };
+ DnssdService *s = userdata;
+ _cleanup_free_ char *name = NULL;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(s);
+
+ if (isempty(rvalue)) {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Service instance name can't be empty. Ignoring.");
+ return -EINVAL;
+ }
+
+ r = free_and_strdup(&s->name_template, rvalue);
+ if (r < 0)
+ return log_oom();
+
+ r = specifier_printf(s->name_template, specifier_table, NULL, &name);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to replace specifiers: %m");
+
+ if (!dns_service_name_is_valid(name)) {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Service instance name template renders to invalid name '%s'. Ignoring.", name);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int config_parse_dnssd_service_type(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) {
+ DnssdService *s = userdata;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(s);
+
+ if (isempty(rvalue)) {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Service type can't be empty. Ignoring.");
+ return -EINVAL;
+ }
+
+ if (!dnssd_srv_type_is_valid(rvalue)) {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Service type is invalid. Ignoring.");
+ return -EINVAL;
+ }
+
+ r = free_and_strdup(&s->type, rvalue);
+ if (r < 0)
+ return log_oom();
+
+ return 0;
+}
+
+int config_parse_dnssd_txt(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) {
+ _cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL;
+ DnssdService *s = userdata;
+ DnsTxtItem *last = NULL;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(s);
+
+ if (isempty(rvalue)) {
+ /* Flush out collected items */
+ s->txt_data_items = dnssd_txtdata_free_all(s->txt_data_items);
+ return 0;
+ }
+
+ txt_data = new0(DnssdTxtData, 1);
+ if (!txt_data)
+ return log_oom();
+
+ for (;;) {
+ _cleanup_free_ char *word = NULL;
+ _cleanup_free_ char *key = NULL;
+ _cleanup_free_ char *value = NULL;
+ _cleanup_free_ void *decoded = NULL;
+ size_t length = 0;
+ DnsTxtItem *i;
+ int r;
+
+ r = extract_first_word(&rvalue, &word, NULL,
+ EXTRACT_QUOTES|EXTRACT_CUNESCAPE|EXTRACT_CUNESCAPE_RELAX);
+ if (r == 0)
+ break;
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r < 0)
+ return log_syntax(unit, LOG_ERR, filename, line, r, "Invalid syntax, ignoring: %s", rvalue);
+
+ r = split_pair(word, "=", &key, &value);
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r == -EINVAL)
+ key = TAKE_PTR(word);
+
+ if (!ascii_is_valid(key)) {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid syntax, ignoring: %s", key);
+ return -EINVAL;
+ }
+
+ switch (ltype) {
+
+ case DNS_TXT_ITEM_DATA:
+ if (value) {
+ r = unbase64mem(value, strlen(value), &decoded, &length);
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r < 0)
+ return log_syntax(unit, LOG_ERR, filename, line, r,
+ "Invalid base64 encoding, ignoring: %s", value);
+ }
+
+ r = dnssd_txt_item_new_from_data(key, decoded, length, &i);
+ if (r < 0)
+ return log_oom();
+ break;
+
+ case DNS_TXT_ITEM_TEXT:
+ r = dnssd_txt_item_new_from_string(key, value, &i);
+ if (r < 0)
+ return log_oom();
+ break;
+
+ default:
+ assert_not_reached("Unknown type of Txt config");
+ }
+
+ LIST_INSERT_AFTER(items, txt_data->txt, last, i);
+ last = i;
+ }
+
+ if (!LIST_IS_EMPTY(txt_data->txt)) {
+ LIST_PREPEND(items, s->txt_data_items, txt_data);
+ txt_data = NULL;
+ }
+
+ return 0;
+}
+
+int manager_parse_config_file(Manager *m) {
+ int r;
+
+ assert(m);
+
+ r = config_parse_many_nulstr(PKGSYSCONFDIR "/resolved.conf",
+ CONF_PATHS_NULSTR("systemd/resolved.conf.d"),
+ "Resolve\0",
+ config_item_perf_lookup, resolved_gperf_lookup,
+ CONFIG_PARSE_WARN, m);
+ if (r < 0)
+ return r;
+
+ if (m->need_builtin_fallbacks) {
+ r = manager_parse_dns_server_string_and_warn(m, DNS_SERVER_FALLBACK, DNS_SERVERS);
+ if (r < 0)
+ return r;
+ }
+
+#if ! HAVE_GCRYPT
+ if (m->dnssec_mode != DNSSEC_NO) {
+ log_warning("DNSSEC option cannot be enabled or set to allow-downgrade when systemd-resolved is built without gcrypt support. Turning off DNSSEC support.");
+ m->dnssec_mode = DNSSEC_NO;
+ }
+#endif
+
+#if ! ENABLE_DNS_OVER_TLS
+ if (m->dns_over_tls_mode != DNS_OVER_TLS_NO) {
+ log_warning("DNS-over-TLS option cannot be set to opportunistic when systemd-resolved is built without DNS-over-TLS support. Turning off DNS-over-TLS support.");
+ m->dns_over_tls_mode = DNS_OVER_TLS_NO;
+ }
+#endif
+ return 0;
+
+}