src/resolve/resolved-conf.c

23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen/***
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen  This file is part of systemd.
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen  Copyright 2014 Tom Gundersen <teg@jklm.no>
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen  systemd is free software; you can redistribute it and/or modify it
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen  under the terms of the GNU Lesser General Public License as published by
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen  the Free Software Foundation; either version 2.1 of the License, or
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen  (at your option) any later version.
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen  systemd is distributed in the hope that it will be useful, but
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen  WITHOUT ANY WARRANTY; without even the implied warranty of
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen  Lesser General Public License for more details.
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen  You should have received a copy of the GNU Lesser General Public License
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen  along with systemd; If not, see <http://www.gnu.org/licenses/>.
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen ***/
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen#include "alloc-util.h"
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen#include "conf-parser.h"
3f6fd1ba65f962702753c4ad284b588e59689a23Lennart Poettering#include "def.h"
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen#include "extract-word.h"
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen#include "parse-util.h"
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen#include "resolved-conf.h"
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen#include "string-util.h"
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersenint manager_add_dns_server_by_string(Manager *m, DnsServerType type, const char *word) {
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        union in_addr_union address;
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        int family, r;
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        DnsServer *s;
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        assert(m);
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        assert(word);
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        r = in_addr_from_string_auto(word, &family, &address);
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        if (r < 0)
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                return r;
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        /* Filter out duplicates */
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        s = dns_server_find(manager_get_first_dns_server(m, type), family, &address);
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        if (s) {
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                /*
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                 * Drop the marker. This is used to find the servers
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                 * that ceased to exist, see
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                 * manager_mark_dns_servers() and
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                 * manager_flush_marked_dns_servers().
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                 */
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                dns_server_move_back_and_unmark(s);
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                return 0;
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        }
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        return dns_server_new(m, NULL, type, NULL, family, &address);
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen}
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersenint manager_parse_dns_server_string_and_warn(Manager *m, DnsServerType type, const char *string) {
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        int r;
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        assert(m);
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        assert(string);
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen        for(;;) {
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                _cleanup_free_ char *word = NULL;
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                r = extract_first_word(&string, &word, NULL, 0);
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                if (r < 0)
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                        return r;
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                if (r == 0)
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                        break;
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen
23fbe14f503c1e98292efc4ba1238adb7dc38d80Tom Gundersen                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.", 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.", 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 manager_parse_config_file(Manager *m) {
        int r;

        assert(m);

        r = config_parse_many(PKGSYSCONFDIR "/resolved.conf",
                              CONF_PATHS_NULSTR("systemd/resolved.conf.d"),
                              "Resolve\0",
                              config_item_perf_lookup, resolved_gperf_lookup,
                              false, 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;
        }

        return 0;

}