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