473 lines
16 KiB
C
473 lines
16 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 "bus-errors.h"
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#include "bus-util.h"
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#include "resolved.h"
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#include "resolved-dns-domain.h"
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static void bus_method_resolve_hostname_complete(DnsQuery *q) {
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int r;
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assert(q);
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switch(q->state) {
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case DNS_QUERY_SKIPPED:
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r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_NAME_SERVERS, "Not appropriate name servers or networks found");
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break;
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case DNS_QUERY_TIMEOUT:
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r = sd_bus_reply_method_errorf(q->request, SD_BUS_ERROR_TIMEOUT, "Query timed out");
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break;
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case DNS_QUERY_ATTEMPTS_MAX:
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r = sd_bus_reply_method_errorf(q->request, SD_BUS_ERROR_TIMEOUT, "All attempts to contact name servers or networks failed");
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break;
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case DNS_QUERY_FAILURE: {
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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if (q->rcode == DNS_RCODE_NXDOMAIN)
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sd_bus_error_setf(&error, _BUS_ERROR_DNS "NXDOMAIN", "Hostname %s does not exist", q->request_hostname);
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else {
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const char *rc, *n;
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char p[DECIMAL_STR_MAX(q->rcode)];
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rc = dns_rcode_to_string(q->rcode);
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if (!rc) {
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sprintf(p, "%i", q->rcode);
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rc = p;
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}
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n = strappenda(_BUS_ERROR_DNS, rc);
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sd_bus_error_setf(&error, n, "Could not resolve hostname %s, server or network returned error %s", q->request_hostname, rc);
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}
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r = sd_bus_reply_method_error(q->request, &error);
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break;
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}
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case DNS_QUERY_SUCCESS: {
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_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
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unsigned i, n, added = 0;
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assert(q->packet);
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r = dns_packet_skip_question(q->packet);
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if (r < 0)
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goto parse_fail;
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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', "(yayi)");
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if (r < 0)
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goto finish;
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n = be16toh(DNS_PACKET_HEADER(q->packet)->ancount) +
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be16toh(DNS_PACKET_HEADER(q->packet)->nscount) +
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be16toh(DNS_PACKET_HEADER(q->packet)->arcount);
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for (i = 0; i < n; i++) {
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_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
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r = dns_packet_read_rr(q->packet, &rr, NULL);
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if (r < 0)
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goto parse_fail;
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if (rr->key.class != DNS_CLASS_IN)
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continue;
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if (!(q->request_family != AF_INET6 && rr->key.type == DNS_TYPE_A) &&
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!(q->request_family != AF_INET && rr->key.type == DNS_TYPE_AAAA))
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continue;
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if (!dns_name_equal(rr->key.name, q->request_hostname))
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continue;
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r = sd_bus_message_open_container(reply, 'r', "yayi");
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if (r < 0)
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goto finish;
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if (rr->key.type == DNS_TYPE_A) {
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r = sd_bus_message_append(reply, "y", AF_INET);
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if (r < 0)
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goto finish;
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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 {
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r = sd_bus_message_append(reply, "y", AF_INET6);
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if (r < 0)
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goto finish;
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r = sd_bus_message_append_array(reply, 'y', &rr->aaaa.in6_addr, sizeof(struct in6_addr));
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}
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if (r < 0)
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goto finish;
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r = sd_bus_message_append(reply, "i", q->packet->ifindex);
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if (r < 0)
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goto finish;
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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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added ++;
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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, "Hostname %s does not have RR of this type", q->request_hostname);
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break;
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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_send(q->manager->bus, reply, NULL);
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break;
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}
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parse_fail:
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case DNS_QUERY_INVALID_REPLY:
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r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
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break;
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case DNS_QUERY_NULL:
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case DNS_QUERY_SENT:
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assert_not_reached("Unexpected query state");
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}
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finish:
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if (r < 0)
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log_error("Failed to send bus reply: %s", strerror(-r));
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dns_query_free(q);
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}
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static int bus_method_resolve_hostname(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
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Manager *m = userdata;
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const char *hostname;
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uint8_t family;
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DnsResourceKey keys[2];
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DnsQuery *q;
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unsigned n = 0;
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int r;
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assert(bus);
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assert(message);
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assert(m);
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r = sd_bus_message_read(message, "sy", &hostname, &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, AF_UNSPEC))
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return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %u", family);
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if (!hostname_is_valid(hostname))
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return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", hostname);
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if (family != AF_INET6) {
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keys[n].class = DNS_CLASS_IN;
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keys[n].type = DNS_TYPE_A;
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keys[n].name = (char*) hostname;
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n++;
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}
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if (family != AF_INET) {
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keys[n].class = DNS_CLASS_IN;
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keys[n].type = DNS_TYPE_AAAA;
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keys[n].name = (char*) hostname;
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n++;
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}
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r = dns_query_new(m, &q, keys, n);
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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->request_hostname = hostname;
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q->complete = bus_method_resolve_hostname_complete;
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r = dns_query_start(q);
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if (r < 0) {
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dns_query_free(q);
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return r;
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}
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return 1;
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}
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static void bus_method_resolve_address_complete(DnsQuery *q) {
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_cleanup_free_ char *ip = NULL;
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int r;
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assert(q);
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in_addr_to_string(q->request_family, &q->request_address, &ip);
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switch(q->state) {
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case DNS_QUERY_SKIPPED:
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r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_NAME_SERVERS, "Not appropriate name servers or networks found");
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break;
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case DNS_QUERY_TIMEOUT:
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r = sd_bus_reply_method_errorf(q->request, SD_BUS_ERROR_TIMEOUT, "Query timed out");
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break;
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case DNS_QUERY_ATTEMPTS_MAX:
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r = sd_bus_reply_method_errorf(q->request, SD_BUS_ERROR_TIMEOUT, "All attempts to contact name servers or networks failed");
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break;
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case DNS_QUERY_FAILURE: {
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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if (q->rcode == DNS_RCODE_NXDOMAIN)
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sd_bus_error_setf(&error, _BUS_ERROR_DNS "NXDOMAIN", "No hostname known for address %s ", ip);
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else {
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const char *rc, *n;
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char p[DECIMAL_STR_MAX(q->rcode)];
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rc = dns_rcode_to_string(q->rcode);
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if (!rc) {
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sprintf(p, "%i", q->rcode);
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rc = p;
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}
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n = strappenda(_BUS_ERROR_DNS, rc);
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sd_bus_error_setf(&error, n, "Could not resolve address %s, server or network returned error %s", ip, rc);
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}
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r = sd_bus_reply_method_error(q->request, &error);
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break;
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}
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case DNS_QUERY_SUCCESS: {
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_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
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unsigned i, n, added = 0;
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_cleanup_free_ char *reverse = NULL;
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assert(q->packet);
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r = dns_name_reverse(q->request_family, &q->request_address, &reverse);
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if (r < 0)
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goto finish;
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r = dns_packet_skip_question(q->packet);
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if (r < 0)
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goto parse_fail;
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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', "s");
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if (r < 0)
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goto finish;
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n = be16toh(DNS_PACKET_HEADER(q->packet)->ancount) +
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be16toh(DNS_PACKET_HEADER(q->packet)->nscount) +
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be16toh(DNS_PACKET_HEADER(q->packet)->arcount);
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for (i = 0; i < n; i++) {
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_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
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r = dns_packet_read_rr(q->packet, &rr, NULL);
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if (r < 0)
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goto parse_fail;
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if (rr->key.class != DNS_CLASS_IN)
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continue;
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if (rr->key.type != DNS_TYPE_PTR)
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continue;
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if (!dns_name_equal(rr->key.name, reverse))
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continue;
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r = sd_bus_message_append(reply, "s", 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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if (added <= 0) {
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r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "Address %s does not have RR of this type", ip);
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break;
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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_send(q->manager->bus, reply, NULL);
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break;
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}
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parse_fail:
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case DNS_QUERY_INVALID_REPLY:
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r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
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break;
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case DNS_QUERY_NULL:
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case DNS_QUERY_SENT:
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assert_not_reached("Unexpected query state");
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}
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finish:
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if (r < 0)
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log_error("Failed to send bus reply: %s", strerror(-r));
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dns_query_free(q);
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}
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static int bus_method_resolve_address(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
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_cleanup_(dns_resource_key_free) DnsResourceKey key = {};
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Manager *m = userdata;
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uint8_t family;
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const void *d;
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int ifindex;
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DnsQuery *q;
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size_t sz;
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int r;
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assert(bus);
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assert(message);
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assert(m);
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r = sd_bus_message_read(message, "y", &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 %u", 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 ((family == AF_INET && sz != sizeof(struct in_addr)) ||
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(family == AF_INET6 && sz != sizeof(struct in6_addr)))
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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, "i", &ifindex);
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if (r < 0)
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return r;
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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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key.class = DNS_CLASS_IN;
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key.type = DNS_TYPE_PTR;
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r = dns_name_reverse(family, d, &key.name);
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if (r < 0)
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return r;
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r = dns_query_new(m, &q, &key, 1);
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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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memcpy(&q->request_address, d, sz);
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q->complete = bus_method_resolve_address_complete;
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r = dns_query_start(q);
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if (r < 0) {
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dns_query_free(q);
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return r;
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}
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return 1;
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}
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static const sd_bus_vtable resolve_vtable[] = {
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SD_BUS_VTABLE_START(0),
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SD_BUS_METHOD("ResolveHostname", "sy", "a(yayi)", bus_method_resolve_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
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SD_BUS_METHOD("ResolveAddress", "yayi", "as", bus_method_resolve_address, SD_BUS_VTABLE_UNPRIVILEGED),
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SD_BUS_VTABLE_END,
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};
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static int on_bus_retry(sd_event_source *s, usec_t usec, void *userdata) {
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Manager *m = userdata;
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assert(s);
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assert(m);
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m->bus_retry_event_source = sd_event_source_unref(m->bus_retry_event_source);
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manager_connect_bus(m);
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return 0;
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}
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int manager_connect_bus(Manager *m) {
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int r;
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assert(m);
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if (m->bus)
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return 0;
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r = sd_bus_default_system(&m->bus);
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if (r < 0) {
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/* We failed to connect? Yuck, we must be in early
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* boot. Let's try in 5s again. As soon as we have
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* kdbus we can stop doing this... */
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log_debug("Failed to connect to bus, trying again in 5s: %s", strerror(-r));
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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);
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if (r < 0) {
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log_error("Failed to install bus reconnect time event: %s", strerror(-r));
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return r;
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}
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return 0;
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}
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r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/resolve1", "org.freedesktop.resolve1.Manager", resolve_vtable, m);
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if (r < 0) {
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log_error("Failed to register object: %s", strerror(-r));
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return r;
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}
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r = sd_bus_request_name(m->bus, "org.freedesktop.resolve1", 0);
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if (r < 0) {
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log_error("Failed to register name: %s", strerror(-r));
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return r;
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}
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r = sd_bus_attach_event(m->bus, m->event, 0);
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if (r < 0) {
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log_error("Failed to attach bus to event loop: %s", strerror(-r));
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return r;
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}
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return 0;
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}
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