Adding upstream version 241.upstream/241upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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;
+
+}