1397 lines
45 KiB
C
1397 lines
45 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2014 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "alloc-util.h"
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#include "bus-common-errors.h"
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#include "bus-util.h"
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#include "dns-domain.h"
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#include "resolved-bus.h"
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#include "resolved-def.h"
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static int reply_query_state(DnsQuery *q) {
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_cleanup_free_ char *ip = NULL;
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const char *name;
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int r;
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if (q->request_address_valid) {
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r = in_addr_to_string(q->request_family, &q->request_address, &ip);
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if (r < 0)
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return r;
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name = ip;
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} else
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name = dns_question_first_name(q->question);
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switch (q->state) {
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case DNS_TRANSACTION_NO_SERVERS:
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return sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");
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case DNS_TRANSACTION_TIMEOUT:
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return sd_bus_reply_method_errorf(q->request, SD_BUS_ERROR_TIMEOUT, "Query timed out");
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case DNS_TRANSACTION_ATTEMPTS_MAX_REACHED:
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return sd_bus_reply_method_errorf(q->request, SD_BUS_ERROR_TIMEOUT, "All attempts to contact name servers or networks failed");
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case DNS_TRANSACTION_INVALID_REPLY:
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return sd_bus_reply_method_errorf(q->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
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case DNS_TRANSACTION_RESOURCES:
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return sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_RESOURCES, "Not enough resources");
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case DNS_TRANSACTION_ABORTED:
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return sd_bus_reply_method_errorf(q->request, BUS_ERROR_ABORTED, "Query aborted");
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case DNS_TRANSACTION_DNSSEC_FAILED:
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return sd_bus_reply_method_errorf(q->request, BUS_ERROR_ABORTED, "DNSSEC validation failed: %s",
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dnssec_result_to_string(q->answer_dnssec_result));
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case DNS_TRANSACTION_RCODE_FAILURE: {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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if (q->answer_rcode == DNS_RCODE_NXDOMAIN)
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sd_bus_error_setf(&error, _BUS_ERROR_DNS "NXDOMAIN", "'%s' not found", name);
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else {
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const char *rc, *n;
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char p[3]; /* the rcode is 4 bits long */
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rc = dns_rcode_to_string(q->answer_rcode);
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if (!rc) {
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sprintf(p, "%i", q->answer_rcode);
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rc = p;
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}
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n = strjoina(_BUS_ERROR_DNS, rc);
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sd_bus_error_setf(&error, n, "Could not resolve '%s', server or network returned error %s", name, rc);
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}
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return sd_bus_reply_method_error(q->request, &error);
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}
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case DNS_TRANSACTION_NULL:
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case DNS_TRANSACTION_PENDING:
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case DNS_TRANSACTION_SUCCESS:
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default:
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assert_not_reached("Impossible state");
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}
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}
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static int append_address(sd_bus_message *reply, DnsResourceRecord *rr, int ifindex) {
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int r;
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assert(reply);
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assert(rr);
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r = sd_bus_message_open_container(reply, 'r', "iiay");
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if (r < 0)
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return r;
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r = sd_bus_message_append(reply, "i", ifindex);
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if (r < 0)
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return r;
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if (rr->key->type == DNS_TYPE_A) {
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r = sd_bus_message_append(reply, "i", AF_INET);
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if (r < 0)
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return r;
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r = sd_bus_message_append_array(reply, 'y', &rr->a.in_addr, sizeof(struct in_addr));
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} else if (rr->key->type == DNS_TYPE_AAAA) {
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r = sd_bus_message_append(reply, "i", AF_INET6);
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if (r < 0)
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return r;
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r = sd_bus_message_append_array(reply, 'y', &rr->aaaa.in6_addr, sizeof(struct in6_addr));
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} else
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return -EAFNOSUPPORT;
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if (r < 0)
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return r;
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r = sd_bus_message_close_container(reply);
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if (r < 0)
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return r;
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return 0;
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}
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static void bus_method_resolve_hostname_complete(DnsQuery *q) {
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_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *canonical = NULL;
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_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
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unsigned added = 0;
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int r;
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assert(q);
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if (q->state != DNS_TRANSACTION_SUCCESS) {
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r = reply_query_state(q);
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goto finish;
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}
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r = dns_query_process_cname(q);
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if (r == -ELOOP) {
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r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_first_name(q->question));
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goto finish;
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}
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if (r < 0)
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goto finish;
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if (r > 0) /* This was a cname, and the query was restarted. */
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return;
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r = sd_bus_message_new_method_return(q->request, &reply);
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if (r < 0)
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goto finish;
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r = sd_bus_message_open_container(reply, 'a', "(iiay)");
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if (r < 0)
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goto finish;
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if (q->answer) {
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DnsResourceRecord *rr;
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int ifindex;
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DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {
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r = dns_question_matches_rr(q->question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain));
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if (r < 0)
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goto finish;
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if (r == 0)
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continue;
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r = append_address(reply, rr, ifindex);
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if (r < 0)
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goto finish;
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if (!canonical)
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canonical = dns_resource_record_ref(rr);
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added ++;
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}
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}
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if (added <= 0) {
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r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_question_first_name(q->question));
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goto finish;
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}
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r = sd_bus_message_close_container(reply);
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if (r < 0)
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goto finish;
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/* Return the precise spelling and uppercasing and CNAME target reported by the server */
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assert(canonical);
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r = sd_bus_message_append(
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reply, "st",
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DNS_RESOURCE_KEY_NAME(canonical->key),
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SD_RESOLVED_FLAGS_MAKE(q->answer_protocol, q->answer_family, q->answer_authenticated));
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if (r < 0)
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goto finish;
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r = sd_bus_send(q->manager->bus, reply, NULL);
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finish:
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if (r < 0) {
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log_error_errno(r, "Failed to send hostname reply: %m");
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sd_bus_reply_method_errno(q->request, r, NULL);
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}
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dns_query_free(q);
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}
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static int check_ifindex_flags(int ifindex, uint64_t *flags, uint64_t ok, sd_bus_error *error) {
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assert(flags);
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if (ifindex < 0)
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return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");
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if (*flags & ~(SD_RESOLVED_PROTOCOLS_ALL|SD_RESOLVED_NO_CNAME|ok))
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return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid flags parameter");
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if ((*flags & SD_RESOLVED_PROTOCOLS_ALL) == 0) /* If no protocol is enabled, enable all */
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*flags |= SD_RESOLVED_PROTOCOLS_ALL;
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return 0;
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}
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static int bus_method_resolve_hostname(sd_bus_message *message, void *userdata, sd_bus_error *error) {
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_cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
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Manager *m = userdata;
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const char *hostname;
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int family, ifindex;
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uint64_t flags;
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DnsQuery *q;
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int r;
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assert(message);
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assert(m);
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assert_cc(sizeof(int) == sizeof(int32_t));
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r = sd_bus_message_read(message, "isit", &ifindex, &hostname, &family, &flags);
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if (r < 0)
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return r;
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if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC))
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return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family);
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r = dns_name_is_valid(hostname);
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if (r < 0)
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return r;
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if (r == 0)
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return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", hostname);
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r = check_ifindex_flags(ifindex, &flags, SD_RESOLVED_NO_SEARCH, error);
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if (r < 0)
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return r;
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r = dns_question_new_address(&question, family, hostname);
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if (r < 0)
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return r;
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r = dns_query_new(m, &q, question, ifindex, flags);
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if (r < 0)
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return r;
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q->request = sd_bus_message_ref(message);
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q->request_family = family;
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q->complete = bus_method_resolve_hostname_complete;
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r = dns_query_bus_track(q, message);
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if (r < 0)
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goto fail;
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r = dns_query_go(q);
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if (r < 0)
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goto fail;
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return 1;
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fail:
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dns_query_free(q);
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return r;
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}
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static void bus_method_resolve_address_complete(DnsQuery *q) {
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_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
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DnsResourceRecord *rr;
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unsigned added = 0;
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int ifindex, r;
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assert(q);
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if (q->state != DNS_TRANSACTION_SUCCESS) {
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r = reply_query_state(q);
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goto finish;
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}
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r = dns_query_process_cname(q);
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if (r == -ELOOP) {
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r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_first_name(q->question));
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goto finish;
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}
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if (r < 0)
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goto finish;
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if (r > 0) /* This was a cname, and the query was restarted. */
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return;
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r = sd_bus_message_new_method_return(q->request, &reply);
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if (r < 0)
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goto finish;
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r = sd_bus_message_open_container(reply, 'a', "(is)");
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if (r < 0)
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goto finish;
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if (q->answer) {
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DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {
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r = dns_question_matches_rr(q->question, rr, NULL);
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if (r < 0)
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goto finish;
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if (r == 0)
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continue;
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r = sd_bus_message_append(reply, "(is)", ifindex, rr->ptr.name);
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if (r < 0)
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goto finish;
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added ++;
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}
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}
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if (added <= 0) {
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_cleanup_free_ char *ip = NULL;
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in_addr_to_string(q->request_family, &q->request_address, &ip);
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r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "Address '%s' does not have any RR of requested type", strna(ip));
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goto finish;
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}
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r = sd_bus_message_close_container(reply);
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if (r < 0)
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goto finish;
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r = sd_bus_message_append(reply, "t", SD_RESOLVED_FLAGS_MAKE(q->answer_protocol, q->answer_family, q->answer_authenticated));
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if (r < 0)
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goto finish;
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r = sd_bus_send(q->manager->bus, reply, NULL);
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finish:
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if (r < 0) {
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log_error_errno(r, "Failed to send address reply: %m");
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sd_bus_reply_method_errno(q->request, r, NULL);
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}
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dns_query_free(q);
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}
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static int bus_method_resolve_address(sd_bus_message *message, void *userdata, sd_bus_error *error) {
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_cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
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Manager *m = userdata;
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int family, ifindex;
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uint64_t flags;
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const void *d;
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DnsQuery *q;
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size_t sz;
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int r;
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assert(message);
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assert(m);
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assert_cc(sizeof(int) == sizeof(int32_t));
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r = sd_bus_message_read(message, "ii", &ifindex, &family);
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if (r < 0)
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return r;
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if (!IN_SET(family, AF_INET, AF_INET6))
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return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family);
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r = sd_bus_message_read_array(message, 'y', &d, &sz);
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if (r < 0)
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return r;
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if (sz != FAMILY_ADDRESS_SIZE(family))
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return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid address size");
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r = sd_bus_message_read(message, "t", &flags);
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if (r < 0)
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return r;
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r = check_ifindex_flags(ifindex, &flags, 0, error);
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if (r < 0)
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return r;
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r = dns_question_new_reverse(&question, family, d);
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if (r < 0)
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return r;
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r = dns_query_new(m, &q, question, ifindex, flags|SD_RESOLVED_NO_SEARCH);
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if (r < 0)
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return r;
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|
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q->request = sd_bus_message_ref(message);
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q->request_family = family;
|
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memcpy(&q->request_address, d, sz);
|
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q->complete = bus_method_resolve_address_complete;
|
|
|
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r = dns_query_bus_track(q, message);
|
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if (r < 0)
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goto fail;
|
|
|
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r = dns_query_go(q);
|
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if (r < 0)
|
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goto fail;
|
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|
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return 1;
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|
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fail:
|
|
dns_query_free(q);
|
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return r;
|
|
}
|
|
|
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static int bus_message_append_rr(sd_bus_message *m, DnsResourceRecord *rr, int ifindex) {
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int r;
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|
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assert(m);
|
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assert(rr);
|
|
|
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r = sd_bus_message_open_container(m, 'r', "iqqay");
|
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if (r < 0)
|
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return r;
|
|
|
|
r = sd_bus_message_append(m, "iqq",
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ifindex,
|
|
rr->key->class,
|
|
rr->key->type);
|
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if (r < 0)
|
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return r;
|
|
|
|
r = dns_resource_record_to_wire_format(rr, false);
|
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if (r < 0)
|
|
return r;
|
|
|
|
r = sd_bus_message_append_array(m, 'y', rr->wire_format, rr->wire_format_size);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return sd_bus_message_close_container(m);
|
|
}
|
|
|
|
static void bus_method_resolve_record_complete(DnsQuery *q) {
|
|
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
|
|
unsigned added = 0;
|
|
int r;
|
|
|
|
assert(q);
|
|
|
|
if (q->state != DNS_TRANSACTION_SUCCESS) {
|
|
r = reply_query_state(q);
|
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goto finish;
|
|
}
|
|
|
|
r = dns_query_process_cname(q);
|
|
if (r == -ELOOP) {
|
|
r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_first_name(q->question));
|
|
goto finish;
|
|
}
|
|
if (r < 0)
|
|
goto finish;
|
|
if (r > 0) /* Following a CNAME */
|
|
return;
|
|
|
|
r = sd_bus_message_new_method_return(q->request, &reply);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
r = sd_bus_message_open_container(reply, 'a', "(iqqay)");
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
if (q->answer) {
|
|
DnsResourceRecord *rr;
|
|
int ifindex;
|
|
|
|
DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {
|
|
r = dns_question_matches_rr(q->question, rr, NULL);
|
|
if (r < 0)
|
|
goto finish;
|
|
if (r == 0)
|
|
continue;
|
|
|
|
r = bus_message_append_rr(reply, rr, ifindex);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
added ++;
|
|
}
|
|
}
|
|
|
|
if (added <= 0) {
|
|
r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "Name '%s' does not have any RR of the requested type", dns_question_first_name(q->question));
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_message_close_container(reply);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
r = sd_bus_message_append(reply, "t", SD_RESOLVED_FLAGS_MAKE(q->answer_protocol, q->answer_family, q->answer_authenticated));
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
r = sd_bus_send(q->manager->bus, reply, NULL);
|
|
|
|
finish:
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to send record reply: %m");
|
|
sd_bus_reply_method_errno(q->request, r, NULL);
|
|
}
|
|
|
|
dns_query_free(q);
|
|
}
|
|
|
|
static int bus_method_resolve_record(sd_bus_message *message, void *userdata, sd_bus_error *error) {
|
|
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
|
|
_cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
|
|
Manager *m = userdata;
|
|
uint16_t class, type;
|
|
const char *name;
|
|
int r, ifindex;
|
|
uint64_t flags;
|
|
DnsQuery *q;
|
|
|
|
assert(message);
|
|
assert(m);
|
|
|
|
assert_cc(sizeof(int) == sizeof(int32_t));
|
|
|
|
r = sd_bus_message_read(message, "isqqt", &ifindex, &name, &class, &type, &flags);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dns_name_is_valid(name);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid name '%s'", name);
|
|
|
|
if (!dns_type_is_valid_query(type))
|
|
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid RR type for query %" PRIu16, type);
|
|
|
|
r = check_ifindex_flags(ifindex, &flags, 0, error);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
question = dns_question_new(1);
|
|
if (!question)
|
|
return -ENOMEM;
|
|
|
|
key = dns_resource_key_new(class, type, name);
|
|
if (!key)
|
|
return -ENOMEM;
|
|
|
|
r = dns_question_add(question, key);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dns_query_new(m, &q, question, ifindex, flags|SD_RESOLVED_NO_SEARCH);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
q->request = sd_bus_message_ref(message);
|
|
q->complete = bus_method_resolve_record_complete;
|
|
|
|
r = dns_query_bus_track(q, message);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
r = dns_query_go(q);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
return 1;
|
|
|
|
fail:
|
|
dns_query_free(q);
|
|
return r;
|
|
}
|
|
|
|
static int append_srv(DnsQuery *q, sd_bus_message *reply, DnsResourceRecord *rr) {
|
|
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *canonical = NULL;
|
|
DnsQuery *aux;
|
|
int r;
|
|
|
|
assert(q);
|
|
assert(reply);
|
|
assert(rr);
|
|
assert(rr->key);
|
|
|
|
if (rr->key->type != DNS_TYPE_SRV)
|
|
return 0;
|
|
|
|
if ((q->flags & SD_RESOLVED_NO_ADDRESS) == 0) {
|
|
/* First, let's see if we could find an appropriate A or AAAA
|
|
* record for the SRV record */
|
|
LIST_FOREACH(auxiliary_queries, aux, q->auxiliary_queries) {
|
|
DnsResourceRecord *zz;
|
|
|
|
if (aux->state != DNS_TRANSACTION_SUCCESS)
|
|
continue;
|
|
if (aux->auxiliary_result != 0)
|
|
continue;
|
|
|
|
r = dns_name_equal(dns_question_first_name(aux->question), rr->srv.name);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
continue;
|
|
|
|
DNS_ANSWER_FOREACH(zz, aux->answer) {
|
|
|
|
r = dns_question_matches_rr(aux->question, zz, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
continue;
|
|
|
|
canonical = dns_resource_record_ref(zz);
|
|
break;
|
|
}
|
|
|
|
if (canonical)
|
|
break;
|
|
}
|
|
|
|
/* Is there are successful A/AAAA lookup for this SRV RR? If not, don't add it */
|
|
if (!canonical)
|
|
return 0;
|
|
}
|
|
|
|
r = sd_bus_message_open_container(reply, 'r', "qqqsa(iiay)s");
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_bus_message_append(
|
|
reply,
|
|
"qqqs",
|
|
rr->srv.priority, rr->srv.weight, rr->srv.port, rr->srv.name);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_bus_message_open_container(reply, 'a', "(iiay)");
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if ((q->flags & SD_RESOLVED_NO_ADDRESS) == 0) {
|
|
LIST_FOREACH(auxiliary_queries, aux, q->auxiliary_queries) {
|
|
DnsResourceRecord *zz;
|
|
int ifindex;
|
|
|
|
if (aux->state != DNS_TRANSACTION_SUCCESS)
|
|
continue;
|
|
if (aux->auxiliary_result != 0)
|
|
continue;
|
|
|
|
r = dns_name_equal(dns_question_first_name(aux->question), rr->srv.name);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
continue;
|
|
|
|
DNS_ANSWER_FOREACH_IFINDEX(zz, ifindex, aux->answer) {
|
|
|
|
r = dns_question_matches_rr(aux->question, zz, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
continue;
|
|
|
|
r = append_address(reply, zz, ifindex);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
}
|
|
|
|
r = sd_bus_message_close_container(reply);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* Note that above we appended the hostname as encoded in the
|
|
* SRV, and here the canonical hostname this maps to. */
|
|
r = sd_bus_message_append(reply, "s", canonical ? DNS_RESOURCE_KEY_NAME(canonical->key) : rr->srv.name);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_bus_message_close_container(reply);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int append_txt(sd_bus_message *reply, DnsResourceRecord *rr) {
|
|
DnsTxtItem *i;
|
|
int r;
|
|
|
|
assert(reply);
|
|
assert(rr);
|
|
assert(rr->key);
|
|
|
|
if (rr->key->type != DNS_TYPE_TXT)
|
|
return 0;
|
|
|
|
LIST_FOREACH(items, i, rr->txt.items) {
|
|
|
|
if (i->length <= 0)
|
|
continue;
|
|
|
|
r = sd_bus_message_append_array(reply, 'y', i->data, i->length);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void resolve_service_all_complete(DnsQuery *q) {
|
|
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *canonical = NULL;
|
|
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
|
|
_cleanup_free_ char *name = NULL, *type = NULL, *domain = NULL;
|
|
DnsQuery *aux;
|
|
unsigned added = false;
|
|
int r;
|
|
|
|
assert(q);
|
|
|
|
if (q->block_all_complete > 0)
|
|
return;
|
|
|
|
if ((q->flags & SD_RESOLVED_NO_ADDRESS) == 0) {
|
|
DnsQuery *bad = NULL;
|
|
bool have_success = false;
|
|
|
|
LIST_FOREACH(auxiliary_queries, aux, q->auxiliary_queries) {
|
|
|
|
switch (aux->state) {
|
|
|
|
case DNS_TRANSACTION_PENDING:
|
|
/* If an auxiliary query is still pending, let's wait */
|
|
return;
|
|
|
|
case DNS_TRANSACTION_SUCCESS:
|
|
if (aux->auxiliary_result == 0)
|
|
have_success = true;
|
|
else
|
|
bad = aux;
|
|
break;
|
|
|
|
default:
|
|
bad = aux;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!have_success) {
|
|
/* We can only return one error, hence pick the last error we encountered */
|
|
|
|
assert(bad);
|
|
|
|
if (bad->state == DNS_TRANSACTION_SUCCESS) {
|
|
assert(bad->auxiliary_result != 0);
|
|
|
|
if (bad->auxiliary_result == -ELOOP) {
|
|
r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_first_name(bad->question));
|
|
goto finish;
|
|
}
|
|
|
|
r = bad->auxiliary_result;
|
|
goto finish;
|
|
}
|
|
|
|
r = reply_query_state(bad);
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
r = sd_bus_message_new_method_return(q->request, &reply);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
r = sd_bus_message_open_container(reply, 'a', "(qqqsa(iiay)s)");
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
if (q->answer) {
|
|
DnsResourceRecord *rr;
|
|
|
|
DNS_ANSWER_FOREACH(rr, q->answer) {
|
|
r = dns_question_matches_rr(q->question, rr, NULL);
|
|
if (r < 0)
|
|
goto finish;
|
|
if (r == 0)
|
|
continue;
|
|
|
|
r = append_srv(q, reply, rr);
|
|
if (r < 0)
|
|
goto finish;
|
|
if (r == 0) /* not an SRV record */
|
|
continue;
|
|
|
|
if (!canonical)
|
|
canonical = dns_resource_record_ref(rr);
|
|
|
|
added++;
|
|
}
|
|
}
|
|
|
|
if (added <= 0) {
|
|
r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_question_first_name(q->question));
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_message_close_container(reply);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
r = sd_bus_message_open_container(reply, 'a', "ay");
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
if (q->answer) {
|
|
DnsResourceRecord *rr;
|
|
|
|
DNS_ANSWER_FOREACH(rr, q->answer) {
|
|
r = dns_question_matches_rr(q->question, rr, NULL);
|
|
if (r < 0)
|
|
goto finish;
|
|
if (r == 0)
|
|
continue;
|
|
|
|
r = append_txt(reply, rr);
|
|
if (r < 0)
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
r = sd_bus_message_close_container(reply);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
assert(canonical);
|
|
r = dns_service_split(DNS_RESOURCE_KEY_NAME(canonical->key), &name, &type, &domain);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
r = sd_bus_message_append(
|
|
reply,
|
|
"ssst",
|
|
name, type, domain,
|
|
SD_RESOLVED_FLAGS_MAKE(q->answer_protocol, q->answer_family, q->answer_authenticated));
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
r = sd_bus_send(q->manager->bus, reply, NULL);
|
|
|
|
finish:
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to send service reply: %m");
|
|
sd_bus_reply_method_errno(q->request, r, NULL);
|
|
}
|
|
|
|
dns_query_free(q);
|
|
}
|
|
|
|
static void resolve_service_hostname_complete(DnsQuery *q) {
|
|
int r;
|
|
|
|
assert(q);
|
|
assert(q->auxiliary_for);
|
|
|
|
if (q->state != DNS_TRANSACTION_SUCCESS) {
|
|
resolve_service_all_complete(q->auxiliary_for);
|
|
return;
|
|
}
|
|
|
|
r = dns_query_process_cname(q);
|
|
if (r > 0) /* This was a cname, and the query was restarted. */
|
|
return;
|
|
|
|
/* This auxiliary lookup is finished or failed, let's see if all are finished now. */
|
|
q->auxiliary_result = r;
|
|
resolve_service_all_complete(q->auxiliary_for);
|
|
}
|
|
|
|
static int resolve_service_hostname(DnsQuery *q, DnsResourceRecord *rr, int ifindex) {
|
|
_cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
|
|
DnsQuery *aux;
|
|
int r;
|
|
|
|
assert(q);
|
|
assert(rr);
|
|
assert(rr->key);
|
|
assert(rr->key->type == DNS_TYPE_SRV);
|
|
|
|
/* OK, we found an SRV record for the service. Let's resolve
|
|
* the hostname included in it */
|
|
|
|
r = dns_question_new_address(&question, q->request_family, rr->srv.name);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dns_query_new(q->manager, &aux, question, ifindex, q->flags|SD_RESOLVED_NO_SEARCH);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
aux->request_family = q->request_family;
|
|
aux->complete = resolve_service_hostname_complete;
|
|
|
|
r = dns_query_make_auxiliary(aux, q);
|
|
if (r == -EAGAIN) {
|
|
/* Too many auxiliary lookups? If so, don't complain,
|
|
* let's just not add this one, we already have more
|
|
* than enough */
|
|
|
|
dns_query_free(aux);
|
|
return 0;
|
|
}
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
/* Note that auxiliary queries do not track the original bus
|
|
* client, only the primary request does that. */
|
|
|
|
r = dns_query_go(aux);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
return 1;
|
|
|
|
fail:
|
|
dns_query_free(aux);
|
|
return r;
|
|
}
|
|
|
|
static void bus_method_resolve_service_complete(DnsQuery *q) {
|
|
unsigned found = 0;
|
|
int r;
|
|
|
|
assert(q);
|
|
|
|
if (q->state != DNS_TRANSACTION_SUCCESS) {
|
|
r = reply_query_state(q);
|
|
goto finish;
|
|
}
|
|
|
|
r = dns_query_process_cname(q);
|
|
if (r == -ELOOP) {
|
|
r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_first_name(q->question));
|
|
goto finish;
|
|
}
|
|
if (r < 0)
|
|
goto finish;
|
|
if (r > 0) /* This was a cname, and the query was restarted. */
|
|
return;
|
|
|
|
if (q->answer) {
|
|
DnsResourceRecord *rr;
|
|
int ifindex;
|
|
|
|
DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {
|
|
r = dns_question_matches_rr(q->question, rr, NULL);
|
|
if (r < 0)
|
|
goto finish;
|
|
if (r == 0)
|
|
continue;
|
|
|
|
if (rr->key->type != DNS_TYPE_SRV)
|
|
continue;
|
|
|
|
if ((q->flags & SD_RESOLVED_NO_ADDRESS) == 0) {
|
|
q->block_all_complete ++;
|
|
r = resolve_service_hostname(q, rr, ifindex);
|
|
q->block_all_complete --;
|
|
|
|
if (r < 0)
|
|
goto finish;
|
|
}
|
|
|
|
found++;
|
|
}
|
|
}
|
|
|
|
if (found <= 0) {
|
|
r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_question_first_name(q->question));
|
|
goto finish;
|
|
}
|
|
|
|
/* Maybe we are already finished? check now... */
|
|
resolve_service_all_complete(q);
|
|
return;
|
|
|
|
finish:
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to send service reply: %m");
|
|
sd_bus_reply_method_errno(q->request, r, NULL);
|
|
}
|
|
|
|
dns_query_free(q);
|
|
}
|
|
|
|
static int bus_method_resolve_service(sd_bus_message *message, void *userdata, sd_bus_error *error) {
|
|
_cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
|
|
const char *name, *type, *domain, *joined;
|
|
_cleanup_free_ char *n = NULL;
|
|
Manager *m = userdata;
|
|
int family, ifindex;
|
|
uint64_t flags;
|
|
DnsQuery *q;
|
|
int r;
|
|
|
|
assert(message);
|
|
assert(m);
|
|
|
|
assert_cc(sizeof(int) == sizeof(int32_t));
|
|
|
|
r = sd_bus_message_read(message, "isssit", &ifindex, &name, &type, &domain, &family, &flags);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC))
|
|
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family);
|
|
|
|
if (isempty(name))
|
|
name = NULL;
|
|
else {
|
|
if (!dns_service_name_is_valid(name))
|
|
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid service name '%s'", name);
|
|
}
|
|
|
|
if (isempty(type))
|
|
type = NULL;
|
|
else if (!dns_srv_type_is_valid(type))
|
|
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid SRV service type '%s'", type);
|
|
|
|
r = dns_name_is_valid(domain);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid domain '%s'", domain);
|
|
|
|
if (name && !type)
|
|
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Service name cannot be specified without service type.");
|
|
|
|
r = check_ifindex_flags(ifindex, &flags, SD_RESOLVED_NO_TXT|SD_RESOLVED_NO_ADDRESS, error);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (type) {
|
|
/* If the type is specified, we generate the full domain name to look up ourselves */
|
|
r = dns_service_join(name, type, domain, &n);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
joined = n;
|
|
} else
|
|
/* If no type is specified, we assume the domain
|
|
* contains the full domain name to lookup already */
|
|
joined = domain;
|
|
|
|
r = dns_question_new_service(&question, joined, !(flags & SD_RESOLVED_NO_TXT));
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dns_query_new(m, &q, question, ifindex, flags|SD_RESOLVED_NO_SEARCH);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
q->request = sd_bus_message_ref(message);
|
|
q->request_family = family;
|
|
q->complete = bus_method_resolve_service_complete;
|
|
|
|
r = dns_query_bus_track(q, message);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
r = dns_query_go(q);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
return 1;
|
|
|
|
fail:
|
|
dns_query_free(q);
|
|
return r;
|
|
}
|
|
|
|
static int append_dns_server(sd_bus_message *reply, DnsServer *s) {
|
|
int r;
|
|
|
|
assert(reply);
|
|
assert(s);
|
|
|
|
r = sd_bus_message_open_container(reply, 'r', "iiay");
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_bus_message_append(reply, "ii", s->link ? s->link->ifindex : 0, s->family);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_bus_message_append_array(reply, 'y', &s->address, FAMILY_ADDRESS_SIZE(s->family));
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return sd_bus_message_close_container(reply);
|
|
}
|
|
|
|
static int bus_property_get_dns_servers(
|
|
sd_bus *bus,
|
|
const char *path,
|
|
const char *interface,
|
|
const char *property,
|
|
sd_bus_message *reply,
|
|
void *userdata,
|
|
sd_bus_error *error) {
|
|
|
|
Manager *m = userdata;
|
|
unsigned c = 0;
|
|
DnsServer *s;
|
|
Iterator i;
|
|
Link *l;
|
|
int r;
|
|
|
|
assert(reply);
|
|
assert(m);
|
|
|
|
r = sd_bus_message_open_container(reply, 'a', "(iiay)");
|
|
if (r < 0)
|
|
return r;
|
|
|
|
LIST_FOREACH(servers, s, m->dns_servers) {
|
|
r = append_dns_server(reply, s);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
c++;
|
|
}
|
|
|
|
HASHMAP_FOREACH(l, m->links, i) {
|
|
LIST_FOREACH(servers, s, l->dns_servers) {
|
|
r = append_dns_server(reply, s);
|
|
if (r < 0)
|
|
return r;
|
|
c++;
|
|
}
|
|
}
|
|
|
|
if (c == 0) {
|
|
LIST_FOREACH(servers, s, m->fallback_dns_servers) {
|
|
r = append_dns_server(reply, s);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
return sd_bus_message_close_container(reply);
|
|
}
|
|
|
|
static int bus_property_get_search_domains(
|
|
sd_bus *bus,
|
|
const char *path,
|
|
const char *interface,
|
|
const char *property,
|
|
sd_bus_message *reply,
|
|
void *userdata,
|
|
sd_bus_error *error) {
|
|
|
|
Manager *m = userdata;
|
|
DnsSearchDomain *d;
|
|
Iterator i;
|
|
Link *l;
|
|
int r;
|
|
|
|
assert(reply);
|
|
assert(m);
|
|
|
|
r = sd_bus_message_open_container(reply, 'a', "(is)");
|
|
if (r < 0)
|
|
return r;
|
|
|
|
LIST_FOREACH(domains, d, m->search_domains) {
|
|
r = sd_bus_message_append(reply, "(is)", 0, d->name);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
HASHMAP_FOREACH(l, m->links, i) {
|
|
LIST_FOREACH(domains, d, l->search_domains) {
|
|
r = sd_bus_message_append(reply, "is", l->ifindex, d->name);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
return sd_bus_message_close_container(reply);
|
|
}
|
|
|
|
static int bus_property_get_transaction_statistics(
|
|
sd_bus *bus,
|
|
const char *path,
|
|
const char *interface,
|
|
const char *property,
|
|
sd_bus_message *reply,
|
|
void *userdata,
|
|
sd_bus_error *error) {
|
|
|
|
Manager *m = userdata;
|
|
|
|
assert(reply);
|
|
assert(m);
|
|
|
|
return sd_bus_message_append(reply, "(tt)",
|
|
(uint64_t) hashmap_size(m->dns_transactions),
|
|
(uint64_t) m->n_transactions_total);
|
|
}
|
|
|
|
static int bus_property_get_cache_statistics(
|
|
sd_bus *bus,
|
|
const char *path,
|
|
const char *interface,
|
|
const char *property,
|
|
sd_bus_message *reply,
|
|
void *userdata,
|
|
sd_bus_error *error) {
|
|
|
|
uint64_t size = 0, hit = 0, miss = 0;
|
|
Manager *m = userdata;
|
|
DnsScope *s;
|
|
|
|
assert(reply);
|
|
assert(m);
|
|
|
|
LIST_FOREACH(scopes, s, m->dns_scopes) {
|
|
size += dns_cache_size(&s->cache);
|
|
hit += s->cache.n_hit;
|
|
miss += s->cache.n_miss;
|
|
}
|
|
|
|
return sd_bus_message_append(reply, "(ttt)", size, hit, miss);
|
|
}
|
|
|
|
static int bus_property_get_dnssec_statistics(
|
|
sd_bus *bus,
|
|
const char *path,
|
|
const char *interface,
|
|
const char *property,
|
|
sd_bus_message *reply,
|
|
void *userdata,
|
|
sd_bus_error *error) {
|
|
|
|
Manager *m = userdata;
|
|
|
|
assert(reply);
|
|
assert(m);
|
|
|
|
return sd_bus_message_append(reply, "(tttt)",
|
|
(uint64_t) m->n_dnssec_secure,
|
|
(uint64_t) m->n_dnssec_insecure,
|
|
(uint64_t) m->n_dnssec_bogus,
|
|
(uint64_t) m->n_dnssec_indeterminate);
|
|
}
|
|
|
|
static int bus_method_reset_statistics(sd_bus_message *message, void *userdata, sd_bus_error *error) {
|
|
Manager *m = userdata;
|
|
DnsScope *s;
|
|
|
|
assert(message);
|
|
assert(m);
|
|
|
|
LIST_FOREACH(scopes, s, m->dns_scopes)
|
|
s->cache.n_hit = s->cache.n_miss = 0;
|
|
|
|
m->n_transactions_total = 0;
|
|
m->n_dnssec_secure = m->n_dnssec_insecure = m->n_dnssec_bogus = m->n_dnssec_indeterminate = 0;
|
|
|
|
return sd_bus_reply_method_return(message, NULL);
|
|
}
|
|
|
|
static const sd_bus_vtable resolve_vtable[] = {
|
|
SD_BUS_VTABLE_START(0),
|
|
SD_BUS_PROPERTY("LLMNRHostname", "s", NULL, offsetof(Manager, llmnr_hostname), 0),
|
|
SD_BUS_PROPERTY("DNSServers", "a(iiay)", bus_property_get_dns_servers, 0, 0),
|
|
SD_BUS_PROPERTY("SearchDomains", "a(is)", bus_property_get_search_domains, 0, 0),
|
|
SD_BUS_PROPERTY("TransactionStatistics", "(tt)", bus_property_get_transaction_statistics, 0, 0),
|
|
SD_BUS_PROPERTY("CacheStatistics", "(ttt)", bus_property_get_cache_statistics, 0, 0),
|
|
SD_BUS_PROPERTY("DNSSECStatistics", "(tttt)", bus_property_get_dnssec_statistics, 0, 0),
|
|
|
|
SD_BUS_METHOD("ResolveHostname", "isit", "a(iiay)st", bus_method_resolve_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
|
|
SD_BUS_METHOD("ResolveAddress", "iiayt", "a(is)t", bus_method_resolve_address, SD_BUS_VTABLE_UNPRIVILEGED),
|
|
SD_BUS_METHOD("ResolveRecord", "isqqt", "a(iqqay)t", bus_method_resolve_record, SD_BUS_VTABLE_UNPRIVILEGED),
|
|
SD_BUS_METHOD("ResolveService", "isssit", "a(qqqsa(iiay)s)aayssst", bus_method_resolve_service, SD_BUS_VTABLE_UNPRIVILEGED),
|
|
SD_BUS_METHOD("ResetStatistics", NULL, NULL, bus_method_reset_statistics, 0),
|
|
SD_BUS_VTABLE_END,
|
|
};
|
|
|
|
static int on_bus_retry(sd_event_source *s, usec_t usec, void *userdata) {
|
|
Manager *m = userdata;
|
|
|
|
assert(s);
|
|
assert(m);
|
|
|
|
m->bus_retry_event_source = sd_event_source_unref(m->bus_retry_event_source);
|
|
|
|
manager_connect_bus(m);
|
|
return 0;
|
|
}
|
|
|
|
static int match_prepare_for_sleep(sd_bus_message *message, void *userdata, sd_bus_error *ret_error) {
|
|
Manager *m = userdata;
|
|
int b, r;
|
|
|
|
assert(message);
|
|
assert(m);
|
|
|
|
r = sd_bus_message_read(message, "b", &b);
|
|
if (r < 0) {
|
|
log_debug_errno(r, "Failed to parse PrepareForSleep signal: %m");
|
|
return 0;
|
|
}
|
|
|
|
if (b)
|
|
return 0;
|
|
|
|
log_debug("Coming back from suspend, verifying all RRs...");
|
|
|
|
manager_verify_all(m);
|
|
return 0;
|
|
}
|
|
|
|
int manager_connect_bus(Manager *m) {
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
if (m->bus)
|
|
return 0;
|
|
|
|
r = sd_bus_default_system(&m->bus);
|
|
if (r < 0) {
|
|
/* We failed to connect? Yuck, we must be in early
|
|
* boot. Let's try in 5s again. As soon as we have
|
|
* kdbus we can stop doing this... */
|
|
|
|
log_debug_errno(r, "Failed to connect to bus, trying again in 5s: %m");
|
|
|
|
r = sd_event_add_time(m->event, &m->bus_retry_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + 5*USEC_PER_SEC, 0, on_bus_retry, m);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to install bus reconnect time event: %m");
|
|
|
|
return 0;
|
|
}
|
|
|
|
r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/resolve1", "org.freedesktop.resolve1.Manager", resolve_vtable, m);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to register object: %m");
|
|
|
|
r = sd_bus_request_name(m->bus, "org.freedesktop.resolve1", 0);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to register name: %m");
|
|
|
|
r = sd_bus_attach_event(m->bus, m->event, 0);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to attach bus to event loop: %m");
|
|
|
|
r = sd_bus_add_match(m->bus, &m->prepare_for_sleep_slot,
|
|
"type='signal',"
|
|
"sender='org.freedesktop.login1',"
|
|
"interface='org.freedesktop.login1.Manager',"
|
|
"member='PrepareForSleep',"
|
|
"path='/org/freedesktop/login1'",
|
|
match_prepare_for_sleep,
|
|
m);
|
|
if (r < 0)
|
|
log_error_errno(r, "Failed to add match for PrepareForSleep: %m");
|
|
|
|
return 0;
|
|
}
|