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third-party-mirror / systemd / 2398d87694e8af48e92ff8fb5f9cf273f706fb00 / . / src / resolve / resolved-bus.c
blob: 61d4b50c5b4e4d5f259eb2ccaf25123f90a72bc1 [file] [log] [blame]
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "alloc-util.h"
#include "bus-common-errors.h"
#include "bus-get-properties.h"
#include "bus-log-control-api.h"
#include "bus-message-util.h"
#include "bus-polkit.h"
#include "dns-domain.h"
#include "format-util.h"
#include "memory-util.h"
#include "missing_capability.h"
#include "resolved-bus.h"
#include "resolved-def.h"
#include "resolved-dns-synthesize.h"
#include "resolved-dnssd-bus.h"
#include "resolved-dnssd.h"
#include "resolved-link-bus.h"
#include "resolved-resolv-conf.h"
#include "socket-netlink.h"
#include "stdio-util.h"
#include "strv.h"
#include "syslog-util.h"
#include "user-util.h"
#include "utf8.h"
BUS_DEFINE_PROPERTY_GET_ENUM(bus_property_get_resolve_support, resolve_support, ResolveSupport);
static int query_on_bus_track(sd_bus_track *t, void *userdata) {
DnsQuery *q = userdata;
assert(t);
assert(q);
if (!DNS_TRANSACTION_IS_LIVE(q->state))
return 0;
log_debug("Client of active query vanished, aborting query.");
dns_query_complete(q, DNS_TRANSACTION_ABORTED);
return 0;
}
static int dns_query_bus_track(DnsQuery *q, sd_bus_message *m) {
int r;
assert(q);
assert(m);
if (!q->bus_track) {
r = sd_bus_track_new(sd_bus_message_get_bus(m), &q->bus_track, query_on_bus_track, q);
if (r < 0)
return r;
}
r = sd_bus_track_add_sender(q->bus_track, m);
if (r < 0)
return r;
return 0;
}
static int reply_query_state(DnsQuery *q) {
assert(q);
assert(q->bus_request);
switch (q->state) {
case DNS_TRANSACTION_NO_SERVERS:
return sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");
case DNS_TRANSACTION_TIMEOUT:
return sd_bus_reply_method_errorf(q->bus_request, SD_BUS_ERROR_TIMEOUT, "Query timed out");
case DNS_TRANSACTION_ATTEMPTS_MAX_REACHED:
return sd_bus_reply_method_errorf(q->bus_request, SD_BUS_ERROR_TIMEOUT, "All attempts to contact name servers or networks failed");
case DNS_TRANSACTION_INVALID_REPLY:
return sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
case DNS_TRANSACTION_ERRNO:
return sd_bus_reply_method_errnof(q->bus_request, q->answer_errno, "Lookup failed due to system error: %m");
case DNS_TRANSACTION_ABORTED:
return sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_ABORTED, "Query aborted");
case DNS_TRANSACTION_DNSSEC_FAILED:
return sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_DNSSEC_FAILED, "DNSSEC validation failed: %s",
dnssec_result_to_string(q->answer_dnssec_result));
case DNS_TRANSACTION_NO_TRUST_ANCHOR:
return sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_NO_TRUST_ANCHOR, "No suitable trust anchor known");
case DNS_TRANSACTION_RR_TYPE_UNSUPPORTED:
return sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_RR_TYPE_UNSUPPORTED, "Server does not support requested resource record type");
case DNS_TRANSACTION_NETWORK_DOWN:
return sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_NETWORK_DOWN, "Network is down");
case DNS_TRANSACTION_NOT_FOUND:
/* We return this as NXDOMAIN. This is only generated when a host doesn't implement LLMNR/TCP, and we
* thus quickly know that we cannot resolve an in-addr.arpa or ip6.arpa address. */
return sd_bus_reply_method_errorf(q->bus_request, _BUS_ERROR_DNS "NXDOMAIN", "'%s' not found", dns_query_string(q));
case DNS_TRANSACTION_NO_SOURCE:
return sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_NO_SOURCE, "All suitable resolution sources turned off");
case DNS_TRANSACTION_STUB_LOOP:
return sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_STUB_LOOP, "Configured DNS server loops back to us");
case DNS_TRANSACTION_RCODE_FAILURE: {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
if (q->answer_rcode == DNS_RCODE_NXDOMAIN)
sd_bus_error_setf(&error, _BUS_ERROR_DNS "NXDOMAIN", "'%s' not found", dns_query_string(q));
else {
const char *rc, *n;
char p[DECIMAL_STR_MAX(q->answer_rcode)];
rc = dns_rcode_to_string(q->answer_rcode);
if (!rc) {
xsprintf(p, "%i", q->answer_rcode);
rc = p;
}
n = strjoina(_BUS_ERROR_DNS, rc);
sd_bus_error_setf(&error, n, "Could not resolve '%s', server or network returned error %s", dns_query_string(q), rc);
}
return sd_bus_reply_method_error(q->bus_request, &error);
}
case DNS_TRANSACTION_NULL:
case DNS_TRANSACTION_PENDING:
case DNS_TRANSACTION_VALIDATING:
case DNS_TRANSACTION_SUCCESS:
default:
assert_not_reached("Impossible state");
}
}
static int append_address(sd_bus_message *reply, DnsResourceRecord *rr, int ifindex) {
int r;
assert(reply);
assert(rr);
r = sd_bus_message_open_container(reply, 'r', "iiay");
if (r < 0)
return r;
r = sd_bus_message_append(reply, "i", ifindex);
if (r < 0)
return r;
if (rr->key->type == DNS_TYPE_A) {
r = sd_bus_message_append(reply, "i", AF_INET);
if (r < 0)
return r;
r = sd_bus_message_append_array(reply, 'y', &rr->a.in_addr, sizeof(struct in_addr));
} else if (rr->key->type == DNS_TYPE_AAAA) {
r = sd_bus_message_append(reply, "i", AF_INET6);
if (r < 0)
return r;
r = sd_bus_message_append_array(reply, 'y', &rr->aaaa.in6_addr, sizeof(struct in6_addr));
} else
return -EAFNOSUPPORT;
if (r < 0)
return r;
r = sd_bus_message_close_container(reply);
if (r < 0)
return r;
return 0;
}
static void bus_method_resolve_hostname_complete(DnsQuery *query) {
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *canonical = NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_(dns_query_freep) DnsQuery *q = query;
_cleanup_free_ char *normalized = NULL;
DnsQuestion *question;
DnsResourceRecord *rr;
unsigned added = 0;
int ifindex, r;
assert(q);
if (q->state != DNS_TRANSACTION_SUCCESS) {
r = reply_query_state(q);
goto finish;
}
r = dns_query_process_cname_many(q);
if (r == -ELOOP) {
r = sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_query_string(q));
goto finish;
}
if (r < 0)
goto finish;
if (r == DNS_QUERY_CNAME) {
/* This was a cname, and the query was restarted. */
TAKE_PTR(q);
return;
}
r = sd_bus_message_new_method_return(q->bus_request, &reply);
if (r < 0)
goto finish;
r = sd_bus_message_open_container(reply, 'a', "(iiay)");
if (r < 0)
goto finish;
question = dns_query_question_for_protocol(q, q->answer_protocol);
DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {
r = dns_question_matches_rr(question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain));
if (r < 0)
goto finish;
if (r == 0)
continue;
r = append_address(reply, rr, ifindex);
if (r < 0)
goto finish;
if (!canonical)
canonical = dns_resource_record_ref(rr);
added++;
}
if (added <= 0) {
r = sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_query_string(q));
goto finish;
}
r = sd_bus_message_close_container(reply);
if (r < 0)
goto finish;
/* The key names are not necessarily normalized, make sure that they are when we return them to our
* bus clients. */
assert(canonical);
r = dns_name_normalize(dns_resource_key_name(canonical->key), 0, &normalized);
if (r < 0)
goto finish;
/* Return the precise spelling and uppercasing and CNAME target reported by the server */
r = sd_bus_message_append(
reply, "st",
normalized,
dns_query_reply_flags_make(q));
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 hostname reply: %m");
sd_bus_reply_method_errno(q->bus_request, r, NULL);
}
}
static int validate_and_mangle_flags(
const char *name,
uint64_t *flags,
uint64_t ok,
sd_bus_error *error) {
assert(flags);
/* Checks that the client supplied interface index and flags parameter actually are valid and make
* sense in our method call context. Specifically:
*
* 1. Checks that the interface index is either 0 (meaning *all* interfaces) or positive
*
* 2. Only the protocols flags and a bunch of NO_XYZ flags are set, at most. Plus additional flags
* specific to our method, passed in the "ok" parameter.
*
* 3. If zero protocol flags are specified it is automatically turned into *all* protocols. This way
* clients can simply pass 0 as flags and all will work as it should. They can also use this so
* that clients don't have to know all the protocols resolved implements, but can just specify 0
* to mean "all supported protocols".
*/
if (*flags & ~(SD_RESOLVED_PROTOCOLS_ALL|
SD_RESOLVED_NO_CNAME|
SD_RESOLVED_NO_VALIDATE|
SD_RESOLVED_NO_SYNTHESIZE|
SD_RESOLVED_NO_CACHE|
SD_RESOLVED_NO_ZONE|
SD_RESOLVED_NO_TRUST_ANCHOR|
SD_RESOLVED_NO_NETWORK|
ok))
return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid flags parameter");
if ((*flags & SD_RESOLVED_PROTOCOLS_ALL) == 0) /* If no protocol is enabled, enable all */
*flags |= SD_RESOLVED_PROTOCOLS_ALL;
/* Imply SD_RESOLVED_NO_SEARCH if permitted and name is dot suffixed. */
if (name && FLAGS_SET(ok, SD_RESOLVED_NO_SEARCH) && dns_name_dot_suffixed(name) > 0)
*flags |= SD_RESOLVED_NO_SEARCH;
return 0;
}
static int parse_as_address(sd_bus_message *m, int ifindex, const char *hostname, int family, uint64_t flags) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_free_ char *canonical = NULL;
union in_addr_union parsed;
int r, ff, parsed_ifindex = 0;
/* Check if the hostname is actually already an IP address formatted as string. In that case just parse it,
* let's not attempt to look it up. */
r = in_addr_ifindex_from_string_auto(hostname, &ff, &parsed, &parsed_ifindex);
if (r < 0) /* not an address */
return 0;
if (family != AF_UNSPEC && ff != family)
return sd_bus_reply_method_errorf(m, BUS_ERROR_NO_SUCH_RR, "The specified address is not of the requested family.");
if (ifindex > 0 && parsed_ifindex > 0 && parsed_ifindex != ifindex)
return sd_bus_reply_method_errorf(m, BUS_ERROR_NO_SUCH_RR, "The specified address interface index does not match requested interface.");
if (parsed_ifindex > 0)
ifindex = parsed_ifindex;
r = sd_bus_message_new_method_return(m, &reply);
if (r < 0)
return r;
r = sd_bus_message_open_container(reply, 'a', "(iiay)");
if (r < 0)
return r;
r = sd_bus_message_open_container(reply, 'r', "iiay");
if (r < 0)
return r;
r = sd_bus_message_append(reply, "ii", ifindex, ff);
if (r < 0)
return r;
r = sd_bus_message_append_array(reply, 'y', &parsed, FAMILY_ADDRESS_SIZE(ff));
if (r < 0)
return r;
r = sd_bus_message_close_container(reply);
if (r < 0)
return r;
r = sd_bus_message_close_container(reply);
if (r < 0)
return r;
/* When an IP address is specified we just return it as canonical name, in order to avoid a DNS
* look-up. However, we reformat it to make sure it's in a truly canonical form (i.e. on IPv6 the inner
* omissions are always done the same way). */
r = in_addr_ifindex_to_string(ff, &parsed, ifindex, &canonical);
if (r < 0)
return r;
r = sd_bus_message_append(reply, "st", canonical,
SD_RESOLVED_FLAGS_MAKE(dns_synthesize_protocol(flags), ff, true, true) |
SD_RESOLVED_SYNTHETIC);
if (r < 0)
return r;
return sd_bus_send(sd_bus_message_get_bus(m), reply, NULL);
}
void bus_client_log(sd_bus_message *m, const char *what) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
const char *comm = NULL;
uid_t uid = UID_INVALID;
pid_t pid = 0;
int r;
assert(m);
assert(what);
if (!DEBUG_LOGGING)
return;
r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_PID|SD_BUS_CREDS_UID|SD_BUS_CREDS_COMM|SD_BUS_CREDS_AUGMENT, &creds);
if (r < 0)
return (void) log_debug_errno(r, "Failed to query client credentials, ignoring: %m");
(void) sd_bus_creds_get_uid(creds, &uid);
(void) sd_bus_creds_get_pid(creds, &pid);
(void) sd_bus_creds_get_comm(creds, &comm);
log_debug("D-Bus %s request from client PID " PID_FMT " (%s) with UID " UID_FMT,
what, pid, strna(comm), uid);
}
static int bus_method_resolve_hostname(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(dns_question_unrefp) DnsQuestion *question_idna = NULL, *question_utf8 = NULL;
_cleanup_(dns_query_freep) DnsQuery *q = NULL;
Manager *m = userdata;
const char *hostname;
int family, ifindex;
uint64_t flags;
int r;
assert(message);
assert(m);
assert_cc(sizeof(int) == sizeof(int32_t));
r = sd_bus_message_read(message, "isit", &ifindex, &hostname, &family, &flags);
if (r < 0)
return r;
if (ifindex < 0)
return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");
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);
r = validate_and_mangle_flags(hostname, &flags, SD_RESOLVED_NO_SEARCH, error);
if (r < 0)
return r;
r = parse_as_address(message, ifindex, hostname, family, flags);
if (r != 0)
return r;
r = dns_name_is_valid(hostname);
if (r < 0)
return r;
if (r == 0)
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", hostname);
r = dns_question_new_address(&question_utf8, family, hostname, false);
if (r < 0)
return r;
r = dns_question_new_address(&question_idna, family, hostname, true);
if (r < 0 && r != -EALREADY)
return r;
bus_client_log(message, "hostname resolution");
r = dns_query_new(m, &q, question_utf8, question_idna ?: question_utf8, NULL, ifindex, flags);
if (r < 0)
return r;
q->bus_request = sd_bus_message_ref(message);
q->request_family = family;
q->complete = bus_method_resolve_hostname_complete;
r = dns_query_bus_track(q, message);
if (r < 0)
return r;
r = dns_query_go(q);
if (r < 0)
return r;
TAKE_PTR(q);
return 1;
}
static void bus_method_resolve_address_complete(DnsQuery *query) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_(dns_query_freep) DnsQuery *q = query;
DnsQuestion *question;
DnsResourceRecord *rr;
unsigned added = 0;
int ifindex, r;
assert(q);
if (q->state != DNS_TRANSACTION_SUCCESS) {
r = reply_query_state(q);
goto finish;
}
r = dns_query_process_cname_many(q);
if (r == -ELOOP) {
r = sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_query_string(q));
goto finish;
}
if (r < 0)
goto finish;
if (r == DNS_QUERY_CNAME) {
/* This was a cname, and the query was restarted. */
TAKE_PTR(q);
return;
}
r = sd_bus_message_new_method_return(q->bus_request, &reply);
if (r < 0)
goto finish;
r = sd_bus_message_open_container(reply, 'a', "(is)");
if (r < 0)
goto finish;
question = dns_query_question_for_protocol(q, q->answer_protocol);
DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {
_cleanup_free_ char *normalized = NULL;
r = dns_question_matches_rr(question, rr, NULL);
if (r < 0)
goto finish;
if (r == 0)
continue;
r = dns_name_normalize(rr->ptr.name, 0, &normalized);
if (r < 0)
goto finish;
r = sd_bus_message_append(reply, "(is)", ifindex, normalized);
if (r < 0)
goto finish;
added++;
}
if (added <= 0) {
_cleanup_free_ char *ip = NULL;
(void) in_addr_to_string(q->request_family, &q->request_address, &ip);
r = sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_NO_SUCH_RR,
"Address '%s' does not have any RR of requested type", strnull(ip));
goto finish;
}
r = sd_bus_message_close_container(reply);
if (r < 0)
goto finish;
r = sd_bus_message_append(reply, "t", dns_query_reply_flags_make(q));
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 address reply: %m");
sd_bus_reply_method_errno(q->bus_request, r, NULL);
}
}
static int bus_method_resolve_address(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
_cleanup_(dns_query_freep) DnsQuery *q = NULL;
Manager *m = userdata;
union in_addr_union a;
int family, ifindex;
uint64_t flags;
int r;
assert(message);
assert(m);
assert_cc(sizeof(int) == sizeof(int32_t));
r = sd_bus_message_read(message, "i", &ifindex);
if (r < 0)
return r;
r = bus_message_read_in_addr_auto(message, error, &family, &a);
if (r < 0)
return r;
r = sd_bus_message_read(message, "t", &flags);
if (r < 0)
return r;
if (ifindex < 0)
return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");
r = validate_and_mangle_flags(NULL, &flags, 0, error);
if (r < 0)
return r;
r = dns_question_new_reverse(&question, family, &a);
if (r < 0)
return r;
bus_client_log(message, "address resolution");
r = dns_query_new(m, &q, question, question, NULL, ifindex, flags|SD_RESOLVED_NO_SEARCH);
if (r < 0)
return r;
q->bus_request = sd_bus_message_ref(message);
q->request_family = family;
q->request_address = a;
q->complete = bus_method_resolve_address_complete;
r = dns_query_bus_track(q, message);
if (r < 0)
return r;
r = dns_query_go(q);
if (r < 0)
return r;
TAKE_PTR(q);
return 1;
}
static int bus_message_append_rr(sd_bus_message *m, DnsResourceRecord *rr, int ifindex) {
int r;
assert(m);
assert(rr);
r = sd_bus_message_open_container(m, 'r', "iqqay");
if (r < 0)
return r;
r = sd_bus_message_append(m, "iqq",
ifindex,
rr->key->class,
rr->key->type);
if (r < 0)
return r;
r = dns_resource_record_to_wire_format(rr, false);
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 *query) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_(dns_query_freep) DnsQuery *q = query;
DnsResourceRecord *rr;
DnsQuestion *question;
unsigned added = 0;
int ifindex;
int r;
assert(q);
if (q->state != DNS_TRANSACTION_SUCCESS) {
r = reply_query_state(q);
goto finish;
}
r = dns_query_process_cname_many(q);
if (r == -ELOOP) {
r = sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_query_string(q));
goto finish;
}
if (r < 0)
goto finish;
if (r == DNS_QUERY_CNAME) {
/* This was a cname, and the query was restarted. */
TAKE_PTR(q);
return;
}
r = sd_bus_message_new_method_return(q->bus_request, &reply);
if (r < 0)
goto finish;
r = sd_bus_message_open_container(reply, 'a', "(iqqay)");
if (r < 0)
goto finish;
question = dns_query_question_for_protocol(q, q->answer_protocol);
DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {
r = dns_question_matches_rr(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->bus_request, BUS_ERROR_NO_SUCH_RR, "Name '%s' does not have any RR of the requested type", dns_query_string(q));
goto finish;
}
r = sd_bus_message_close_container(reply);
if (r < 0)
goto finish;
r = sd_bus_message_append(reply, "t", dns_query_reply_flags_make(q));
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->bus_request, r, NULL);
}
}
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;
_cleanup_(dns_query_freep) DnsQuery *q = NULL;
Manager *m = userdata;
uint16_t class, type;
const char *name;
int r, ifindex;
uint64_t flags;
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;
if (ifindex < 0)
return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");
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, "Specified resource record type %" PRIu16 " may not be used in a query.", type);
if (dns_type_is_zone_transer(type))
return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Zone transfers not permitted via this programming interface.");
if (dns_type_is_obsolete(type))
return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Specified DNS resource record type %" PRIu16 " is obsolete.", type);
r = validate_and_mangle_flags(name, &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, 0);
if (r < 0)
return r;
bus_client_log(message, "resource record resolution");
/* Setting SD_RESOLVED_CLAMP_TTL: let's request that the TTL is fixed up for locally cached entries,
* after all we return it in the wire format blob. */
r = dns_query_new(m, &q, question, question, NULL, ifindex, flags|SD_RESOLVED_NO_SEARCH|SD_RESOLVED_CLAMP_TTL);
if (r < 0)
return r;
q->bus_request = sd_bus_message_ref(message);
q->complete = bus_method_resolve_record_complete;
r = dns_query_bus_track(q, message);
if (r < 0)
return r;
r = dns_query_go(q);
if (r < 0)
return r;
TAKE_PTR(q);
return 1;
}
static int append_srv(DnsQuery *q, sd_bus_message *reply, DnsResourceRecord *rr) {
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *canonical = NULL;
_cleanup_free_ char *normalized = 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;
DnsQuestion *question;
if (aux->state != DNS_TRANSACTION_SUCCESS)
continue;
if (aux->auxiliary_result != 0)
continue;
question = dns_query_question_for_protocol(aux, aux->answer_protocol);
r = dns_name_equal(dns_question_first_name(question), rr->srv.name);
if (r < 0)
return r;
if (r == 0)
continue;
DNS_ANSWER_FOREACH(zz, aux->answer) {
r = dns_question_matches_rr(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 = dns_name_normalize(rr->srv.name, 0, &normalized);
if (r < 0)
return r;
r = sd_bus_message_append(
reply,
"qqqs",
rr->srv.priority, rr->srv.weight, rr->srv.port, normalized);
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;
DnsQuestion *question;
int ifindex;
if (aux->state != DNS_TRANSACTION_SUCCESS)
continue;
if (aux->auxiliary_result != 0)
continue;
question = dns_query_question_for_protocol(aux, aux->answer_protocol);
r = dns_name_equal(dns_question_first_name(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(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;
if (canonical) {
normalized = mfree(normalized);
r = dns_name_normalize(dns_resource_key_name(canonical->key), 0, &normalized);
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", normalized);
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 *query) {
_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;
_cleanup_(dns_query_freep) DnsQuery *q = query;
DnsQuestion *question;
DnsResourceRecord *rr;
unsigned added = 0;
DnsQuery *aux;
int r;
assert(q);
if (q->block_all_complete > 0) {
TAKE_PTR(q);
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 */
TAKE_PTR(q);
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->bus_request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_query_string(bad));
goto finish;
}
assert(bad->auxiliary_result < 0);
r = bad->auxiliary_result;
goto finish;
}
r = reply_query_state(bad);
goto finish;
}
}
r = sd_bus_message_new_method_return(q->bus_request, &reply);
if (r < 0)
goto finish;
r = sd_bus_message_open_container(reply, 'a', "(qqqsa(iiay)s)");
if (r < 0)
goto finish;
question = dns_query_question_for_protocol(q, q->answer_protocol);
DNS_ANSWER_FOREACH(rr, q->answer) {
r = dns_question_matches_rr(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->bus_request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_query_string(q));
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;
DNS_ANSWER_FOREACH(rr, q->answer) {
r = dns_question_matches_rr(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,
dns_query_reply_flags_make(q));
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->bus_request, r, NULL);
}
}
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_many(q);
if (r == DNS_QUERY_CNAME) /* 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 < 0 ? r : 0;
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;
_cleanup_(dns_query_freep) DnsQuery *aux = NULL;
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, false);
if (r < 0)
return r;
r = dns_query_new(q->manager, &aux, question, question, NULL, ifindex, q->flags|SD_RESOLVED_NO_SEARCH);
if (r < 0)
return r;
aux->bus_request = sd_bus_message_ref(q->bus_request);
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 */
return 0;
if (r < 0)
return r;
/* 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)
return r;
TAKE_PTR(aux);
return 1;
}
static void bus_method_resolve_service_complete(DnsQuery *query) {
_cleanup_(dns_query_freep) DnsQuery *q = query;
bool has_root_domain = false;
DnsResourceRecord *rr;
DnsQuestion *question;
unsigned found = 0;
int ifindex, r;
assert(q);
if (q->state != DNS_TRANSACTION_SUCCESS) {
r = reply_query_state(q);
goto finish;
}
r = dns_query_process_cname_many(q);
if (r == -ELOOP) {
r = sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_query_string(q));
goto finish;
}
if (r < 0)
goto finish;
if (r == DNS_QUERY_CNAME) {
/* This was a cname, and the query was restarted. */
TAKE_PTR(q);
return;
}
question = dns_query_question_for_protocol(q, q->answer_protocol);
DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {
r = dns_question_matches_rr(question, rr, NULL);
if (r < 0)
goto finish;
if (r == 0)
continue;
if (rr->key->type != DNS_TYPE_SRV)
continue;
if (dns_name_is_root(rr->srv.name)) {
has_root_domain = true;
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 (has_root_domain && found <= 0) {
/* If there's exactly one SRV RR and it uses
* the root domain as hostname, then the
* service is explicitly not offered on the
* domain. Report this as a recognizable
* error. See RFC 2782, Section "Usage
* Rules". */
r = sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_NO_SUCH_SERVICE, "'%s' does not provide the requested service", dns_query_string(q));
goto finish;
}
if (found <= 0) {
r = sd_bus_reply_method_errorf(q->bus_request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_query_string(q));
goto finish;
}
/* Maybe we are already finished? check now... */
resolve_service_all_complete(TAKE_PTR(q));
return;
finish:
if (r < 0) {
log_error_errno(r, "Failed to send service reply: %m");
sd_bus_reply_method_errno(q->bus_request, r, NULL);
}
}
static int bus_method_resolve_service(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(dns_question_unrefp) DnsQuestion *question_idna = NULL, *question_utf8 = NULL;
_cleanup_(dns_query_freep) DnsQuery *q = NULL;
const char *name, *type, *domain;
Manager *m = userdata;
int family, ifindex;
uint64_t flags;
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 (ifindex < 0)
return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");
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_set(error, SD_BUS_ERROR_INVALID_ARGS, "Service name cannot be specified without service type.");
r = validate_and_mangle_flags(name, &flags, SD_RESOLVED_NO_TXT|SD_RESOLVED_NO_ADDRESS, error);
if (r < 0)
return r;
r = dns_question_new_service(&question_utf8, name, type, domain, !(flags & SD_RESOLVED_NO_TXT), false);
if (r < 0)
return r;
r = dns_question_new_service(&question_idna, name, type, domain, !(flags & SD_RESOLVED_NO_TXT), true);
if (r < 0)
return r;
bus_client_log(message, "service resolution");
r = dns_query_new(m, &q, question_utf8, question_idna, NULL, ifindex, flags|SD_RESOLVED_NO_SEARCH);
if (r < 0)
return r;
q->bus_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)
return r;
r = dns_query_go(q);
if (r < 0)
return r;
TAKE_PTR(q);
return 1;
}
int bus_dns_server_append(sd_bus_message *reply, DnsServer *s, bool with_ifindex, bool extended) {
int r;
assert(reply);
if (!s) {
if (with_ifindex) {
if (extended)
return sd_bus_message_append(reply, "(iiayqs)", 0, AF_UNSPEC, 0, 0, NULL);
else
return sd_bus_message_append(reply, "(iiay)", 0, AF_UNSPEC, 0);
} else {
if (extended)
return sd_bus_message_append(reply, "(iayqs)", AF_UNSPEC, 0, 0, NULL);
else
return sd_bus_message_append(reply, "(iay)", AF_UNSPEC, 0);
}
}
r = sd_bus_message_open_container(reply, 'r', with_ifindex ? (extended ? "iiayqs" : "iiay") : (extended ? "iayqs" : "iay"));
if (r < 0)
return r;
if (with_ifindex) {
r = sd_bus_message_append(reply, "i", dns_server_ifindex(s));
if (r < 0)
return r;
}
r = sd_bus_message_append(reply, "i", 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;
if (extended) {
r = sd_bus_message_append(reply, "q", s->port);
if (r < 0)
return r;
r = sd_bus_message_append(reply, "s", s->server_name);
if (r < 0)
return r;
}
return sd_bus_message_close_container(reply);
}
static int bus_property_get_dns_servers_internal(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error,
bool extended) {
Manager *m = userdata;
DnsServer *s;
Link *l;
int r;
assert(reply);
assert(m);
r = sd_bus_message_open_container(reply, 'a', extended ? "(iiayqs)" : "(iiay)");
if (r < 0)
return r;
LIST_FOREACH(servers, s, m->dns_servers) {
r = bus_dns_server_append(reply, s, true, extended);
if (r < 0)
return r;
}
HASHMAP_FOREACH(l, m->links)
LIST_FOREACH(servers, s, l->dns_servers) {
r = bus_dns_server_append(reply, s, true, extended);
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) {
return bus_property_get_dns_servers_internal(bus, path, interface, property, reply, userdata, error, false);
}
static int bus_property_get_dns_servers_ex(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
return bus_property_get_dns_servers_internal(bus, path, interface, property, reply, userdata, error, true);
}
static int bus_property_get_fallback_dns_servers_internal(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error,
bool extended) {
DnsServer *s, **f = userdata;
int r;
assert(reply);
assert(f);
r = sd_bus_message_open_container(reply, 'a', extended ? "(iiayqs)" : "(iiay)");
if (r < 0)
return r;
LIST_FOREACH(servers, s, *f) {
r = bus_dns_server_append(reply, s, true, extended);
if (r < 0)
return r;
}
return sd_bus_message_close_container(reply);
}
static int bus_property_get_fallback_dns_servers(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
return bus_property_get_fallback_dns_servers_internal(bus, path, interface, property, reply, userdata, error, false);
}
static int bus_property_get_fallback_dns_servers_ex(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
return bus_property_get_fallback_dns_servers_internal(bus, path, interface, property, reply, userdata, error, true);
}
static int bus_property_get_current_dns_server_internal(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error,
bool extended) {
DnsServer *s;
assert(reply);
assert(userdata);
s = *(DnsServer **) userdata;
return bus_dns_server_append(reply, s, true, extended);
}
static int bus_property_get_current_dns_server(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
return bus_property_get_current_dns_server_internal(bus, path, interface, property, reply, userdata, error, false);
}
static int bus_property_get_current_dns_server_ex(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
return bus_property_get_current_dns_server_internal(bus, path, interface, property, reply, userdata, error, true);
}
static int bus_property_get_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;
Link *l;
int r;
assert(reply);
assert(m);
r = sd_bus_message_open_container(reply, 'a', "(isb)");
if (r < 0)
return r;
LIST_FOREACH(domains, d, m->search_domains) {
r = sd_bus_message_append(reply, "(isb)", 0, d->name, d->route_only);
if (r < 0)
return r;
}
HASHMAP_FOREACH(l, m->links) {
LIST_FOREACH(domains, d, l->search_domains) {
r = sd_bus_message_append(reply, "(isb)", l->ifindex, d->name, d->route_only);
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_verdict[DNSSEC_SECURE],
(uint64_t) m->n_dnssec_verdict[DNSSEC_INSECURE],
(uint64_t) m->n_dnssec_verdict[DNSSEC_BOGUS],
(uint64_t) m->n_dnssec_verdict[DNSSEC_INDETERMINATE]);
}
static int bus_property_get_ntas(
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;
const char *domain;
int r;
assert(reply);
assert(m);
r = sd_bus_message_open_container(reply, 'a', "s");
if (r < 0)
return r;
SET_FOREACH(domain, m->trust_anchor.negative_by_name) {
r = sd_bus_message_append(reply, "s", domain);
if (r < 0)
return r;
}
return sd_bus_message_close_container(reply);
}
static BUS_DEFINE_PROPERTY_GET_ENUM(bus_property_get_dns_stub_listener_mode, dns_stub_listener_mode, DnsStubListenerMode);
static BUS_DEFINE_PROPERTY_GET(bus_property_get_dnssec_supported, "b", Manager, manager_dnssec_supported);
static BUS_DEFINE_PROPERTY_GET2(bus_property_get_dnssec_mode, "s", Manager, manager_get_dnssec_mode, dnssec_mode_to_string);
static BUS_DEFINE_PROPERTY_GET2(bus_property_get_dns_over_tls_mode, "s", Manager, manager_get_dns_over_tls_mode, dns_over_tls_mode_to_string);
static int bus_property_get_resolv_conf_mode(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
int r;
assert(reply);
r = resolv_conf_mode();
if (r < 0) {
log_warning_errno(r, "Failed to test /etc/resolv.conf mode, ignoring: %m");
return sd_bus_message_append(reply, "s", NULL);
}
return sd_bus_message_append(reply, "s", resolv_conf_mode_to_string(r));
}
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);
bus_client_log(message, "statistics reset");
LIST_FOREACH(scopes, s, m->dns_scopes)
s->cache.n_hit = s->cache.n_miss = 0;
m->n_transactions_total = 0;
zero(m->n_dnssec_verdict);
return sd_bus_reply_method_return(message, NULL);
}
static int get_any_link(Manager *m, int ifindex, Link **ret, sd_bus_error *error) {
Link *l;
assert(m);
assert(ret);
l = hashmap_get(m->links, INT_TO_PTR(ifindex));
if (!l)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_LINK, "Link %i not known", ifindex);
*ret = l;
return 0;
}
static int call_link_method(Manager *m, sd_bus_message *message, sd_bus_message_handler_t handler, sd_bus_error *error) {
int ifindex, r;
Link *l;
assert(m);
assert(message);
assert(handler);
r = bus_message_read_ifindex(message, error, &ifindex);
if (r < 0)
return r;
r = get_any_link(m, ifindex, &l, error);
if (r < 0)
return r;
return handler(message, l, error);
}
static int bus_method_set_link_dns_servers(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return call_link_method(userdata, message, bus_link_method_set_dns_servers, error);
}
static int bus_method_set_link_dns_servers_ex(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return call_link_method(userdata, message, bus_link_method_set_dns_servers_ex, error);
}
static int bus_method_set_link_domains(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return call_link_method(userdata, message, bus_link_method_set_domains, error);
}
static int bus_method_set_link_default_route(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return call_link_method(userdata, message, bus_link_method_set_default_route, error);
}
static int bus_method_set_link_llmnr(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return call_link_method(userdata, message, bus_link_method_set_llmnr, error);
}
static int bus_method_set_link_mdns(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return call_link_method(userdata, message, bus_link_method_set_mdns, error);
}
static int bus_method_set_link_dns_over_tls(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return call_link_method(userdata, message, bus_link_method_set_dns_over_tls, error);
}
static int bus_method_set_link_dnssec(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return call_link_method(userdata, message, bus_link_method_set_dnssec, error);
}
static int bus_method_set_link_dnssec_negative_trust_anchors(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return call_link_method(userdata, message, bus_link_method_set_dnssec_negative_trust_anchors, error);
}
static int bus_method_revert_link(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return call_link_method(userdata, message, bus_link_method_revert, error);
}
static int bus_method_get_link(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_free_ char *p = NULL;
Manager *m = userdata;
int r, ifindex;
Link *l;
assert(message);
assert(m);
r = bus_message_read_ifindex(message, error, &ifindex);
if (r < 0)
return r;
r = get_any_link(m, ifindex, &l, error);
if (r < 0)
return r;
p = link_bus_path(l);
if (!p)
return -ENOMEM;
return sd_bus_reply_method_return(message, "o", p);
}
static int bus_method_flush_caches(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
assert(message);
assert(m);
bus_client_log(message, "cache flush");
manager_flush_caches(m, LOG_INFO);
return sd_bus_reply_method_return(message, NULL);
}
static int bus_method_reset_server_features(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
assert(message);
assert(m);
bus_client_log(message, "server feature reset");
manager_reset_server_features(m);
return sd_bus_reply_method_return(message, NULL);
}
static int dnssd_service_on_bus_track(sd_bus_track *t, void *userdata) {
DnssdService *s = userdata;
assert(t);
assert(s);
log_debug("Client of active request vanished, destroying DNS-SD service.");
dnssd_service_free(s);
return 0;
}
static int bus_method_register_service(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
_cleanup_(dnssd_service_freep) DnssdService *service = NULL;
_cleanup_(sd_bus_track_unrefp) sd_bus_track *bus_track = NULL;
_cleanup_free_ char *path = NULL;
_cleanup_free_ char *instance_name = NULL;
Manager *m = userdata;
DnssdService *s = NULL;
const char *name;
const char *name_template;
const char *type;
uid_t euid;
int r;
assert(message);
assert(m);
if (m->mdns_support != RESOLVE_SUPPORT_YES)
return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Support for MulticastDNS is disabled");
service = new0(DnssdService, 1);
if (!service)
return log_oom();
r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
if (r < 0)
return r;
r = sd_bus_creds_get_euid(creds, &euid);
if (r < 0)
return r;
service->originator = euid;
r = sd_bus_message_read(message, "sssqqq", &name, &name_template, &type,
&service->port, &service->priority,
&service->weight);
if (r < 0)
return r;
s = hashmap_get(m->dnssd_services, name);
if (s)
return sd_bus_error_setf(error, BUS_ERROR_DNSSD_SERVICE_EXISTS, "DNS-SD service '%s' exists already", name);
if (!dnssd_srv_type_is_valid(type))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "DNS-SD service type '%s' is invalid", type);
service->name = strdup(name);
if (!service->name)
return log_oom();
service->name_template = strdup(name_template);
if (!service->name_template)
return log_oom();
service->type = strdup(type);
if (!service->type)
return log_oom();
r = dnssd_render_instance_name(service, &instance_name);
if (r < 0)
return r;
r = sd_bus_message_enter_container(message, SD_BUS_TYPE_ARRAY, "a{say}");
if (r < 0)
return r;
while ((r = sd_bus_message_enter_container(message, SD_BUS_TYPE_ARRAY, "{say}")) > 0) {
_cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL;
DnsTxtItem *last = NULL;
txt_data = new0(DnssdTxtData, 1);
if (!txt_data)
return log_oom();
while ((r = sd_bus_message_enter_container(message, SD_BUS_TYPE_DICT_ENTRY, "say")) > 0) {
const char *key;
const void *value;
size_t size;
DnsTxtItem *i;
r = sd_bus_message_read(message, "s", &key);
if (r < 0)
return r;
if (isempty(key))
return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Keys in DNS-SD TXT RRs can't be empty");
if (!ascii_is_valid(key))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "TXT key '%s' contains non-ASCII symbols", key);
r = sd_bus_message_read_array(message, 'y', &value, &size);
if (r < 0)
return r;
r = dnssd_txt_item_new_from_data(key, value, size, &i);
if (r < 0)
return r;
LIST_INSERT_AFTER(items, txt_data->txt, last, i);
last = i;
r = sd_bus_message_exit_container(message);
if (r < 0)
return r;
}
if (r < 0)
return r;
r = sd_bus_message_exit_container(message);
if (r < 0)
return r;
if (txt_data->txt) {
LIST_PREPEND(items, service->txt_data_items, txt_data);
txt_data = NULL;
}
}
if (r < 0)
return r;
r = sd_bus_message_exit_container(message);
if (r < 0)
return r;
if (!service->txt_data_items) {
_cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL;
txt_data = new0(DnssdTxtData, 1);
if (!txt_data)
return log_oom();
r = dns_txt_item_new_empty(&txt_data->txt);
if (r < 0)
return r;
LIST_PREPEND(items, service->txt_data_items, txt_data);
txt_data = NULL;
}
r = sd_bus_path_encode("/org/freedesktop/resolve1/dnssd", service->name, &path);
if (r < 0)
return r;
r = bus_verify_polkit_async(message, CAP_SYS_ADMIN,
"org.freedesktop.resolve1.register-service",
NULL, false, UID_INVALID,
&m->polkit_registry, error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Polkit will call us back */
r = hashmap_ensure_put(&m->dnssd_services, &string_hash_ops, service->name, service);
if (r < 0)
return r;
r = sd_bus_track_new(sd_bus_message_get_bus(message), &bus_track, dnssd_service_on_bus_track, service);
if (r < 0)
return r;
r = sd_bus_track_add_sender(bus_track, message);
if (r < 0)
return r;
service->manager = m;
service = NULL;
manager_refresh_rrs(m);
return sd_bus_reply_method_return(message, "o", path);
}
static int call_dnssd_method(Manager *m, sd_bus_message *message, sd_bus_message_handler_t handler, sd_bus_error *error) {
_cleanup_free_ char *name = NULL;
DnssdService *s = NULL;
const char *path;
int r;
assert(m);
assert(message);
assert(handler);
r = sd_bus_message_read(message, "o", &path);
if (r < 0)
return r;
r = sd_bus_path_decode(path, "/org/freedesktop/resolve1/dnssd", &name);
if (r == 0)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_DNSSD_SERVICE, "DNS-SD service with object path '%s' does not exist", path);
if (r < 0)
return r;
s = hashmap_get(m->dnssd_services, name);
if (!s)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_DNSSD_SERVICE, "DNS-SD service '%s' not known", name);
return handler(message, s, error);
}
static int bus_method_unregister_service(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
assert(message);
assert(m);
return call_dnssd_method(m, message, bus_dnssd_method_unregister, error);
}
static const sd_bus_vtable resolve_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_PROPERTY("LLMNRHostname", "s", NULL, offsetof(Manager, llmnr_hostname), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("LLMNR", "s", bus_property_get_resolve_support, offsetof(Manager, llmnr_support), 0),
SD_BUS_PROPERTY("MulticastDNS", "s", bus_property_get_resolve_support, offsetof(Manager, mdns_support), 0),
SD_BUS_PROPERTY("DNSOverTLS", "s", bus_property_get_dns_over_tls_mode, 0, 0),
SD_BUS_PROPERTY("DNS", "a(iiay)", bus_property_get_dns_servers, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("DNSEx", "a(iiayqs)", bus_property_get_dns_servers_ex, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("FallbackDNS", "a(iiay)", bus_property_get_fallback_dns_servers, offsetof(Manager, fallback_dns_servers), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("FallbackDNSEx", "a(iiayqs)", bus_property_get_fallback_dns_servers_ex, offsetof(Manager, fallback_dns_servers), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("CurrentDNSServer", "(iiay)", bus_property_get_current_dns_server, offsetof(Manager, current_dns_server), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("CurrentDNSServerEx", "(iiayqs)", bus_property_get_current_dns_server_ex, offsetof(Manager, current_dns_server), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("Domains", "a(isb)", bus_property_get_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("DNSSEC", "s", bus_property_get_dnssec_mode, 0, 0),
SD_BUS_PROPERTY("DNSSECStatistics", "(tttt)", bus_property_get_dnssec_statistics, 0, 0),
SD_BUS_PROPERTY("DNSSECSupported", "b", bus_property_get_dnssec_supported, 0, 0),
SD_BUS_PROPERTY("DNSSECNegativeTrustAnchors", "as", bus_property_get_ntas, 0, 0),
SD_BUS_PROPERTY("DNSStubListener", "s", bus_property_get_dns_stub_listener_mode, offsetof(Manager, dns_stub_listener_mode), 0),
SD_BUS_PROPERTY("ResolvConfMode", "s", bus_property_get_resolv_conf_mode, 0, 0),
SD_BUS_METHOD_WITH_ARGS("ResolveHostname",
SD_BUS_ARGS("i", ifindex, "s", name, "i", family, "t", flags),
SD_BUS_RESULT("a(iiay)", addresses, "s", canonical, "t", flags),
bus_method_resolve_hostname,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("ResolveAddress",
SD_BUS_ARGS("i", ifindex, "i", family, "ay", address, "t", flags),
SD_BUS_RESULT("a(is)", names, "t", flags),
bus_method_resolve_address,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("ResolveRecord",
SD_BUS_ARGS("i", ifindex, "s", name, "q", class, "q", type, "t", flags),
SD_BUS_RESULT("a(iqqay)", records, "t", flags),
bus_method_resolve_record,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("ResolveService",
SD_BUS_ARGS("i", ifindex,
"s", name,
"s", type,
"s", domain,
"i", family,
"t", flags),
SD_BUS_RESULT("a(qqqsa(iiay)s)", srv_data,
"aay", txt_data,
"s", canonical_name,
"s", canonical_type,
"s", canonical_domain,
"t", flags),
bus_method_resolve_service,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("GetLink",
SD_BUS_ARGS("i", ifindex),
SD_BUS_RESULT("o", path),
bus_method_get_link,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("SetLinkDNS",
SD_BUS_ARGS("i", ifindex, "a(iay)", addresses),
SD_BUS_NO_RESULT,
bus_method_set_link_dns_servers,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("SetLinkDNSEx",
SD_BUS_ARGS("i", ifindex, "a(iayqs)", addresses),
SD_BUS_NO_RESULT,
bus_method_set_link_dns_servers_ex,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("SetLinkDomains",
SD_BUS_ARGS("i", ifindex, "a(sb)", domains),
SD_BUS_NO_RESULT,
bus_method_set_link_domains,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("SetLinkDefaultRoute",
SD_BUS_ARGS("i", ifindex, "b", enable),
SD_BUS_NO_RESULT,
bus_method_set_link_default_route,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("SetLinkLLMNR",
SD_BUS_ARGS("i", ifindex, "s", mode),
SD_BUS_NO_RESULT,
bus_method_set_link_llmnr,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("SetLinkMulticastDNS",
SD_BUS_ARGS("i", ifindex, "s", mode),
SD_BUS_NO_RESULT,
bus_method_set_link_mdns,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("SetLinkDNSOverTLS",
SD_BUS_ARGS("i", ifindex, "s", mode),
SD_BUS_NO_RESULT,
bus_method_set_link_dns_over_tls,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("SetLinkDNSSEC",
SD_BUS_ARGS("i", ifindex, "s", mode),
SD_BUS_NO_RESULT,
bus_method_set_link_dnssec,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("SetLinkDNSSECNegativeTrustAnchors",
SD_BUS_ARGS("i", ifindex, "as", names),
SD_BUS_NO_RESULT,
bus_method_set_link_dnssec_negative_trust_anchors,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("RevertLink",
SD_BUS_ARGS("i", ifindex),
SD_BUS_NO_RESULT,
bus_method_revert_link,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("RegisterService",
SD_BUS_ARGS("s", name,
"s", name_template,
"s", type,
"q", service_port,
"q", service_priority,
"q", service_weight,
"aa{say}", txt_datas),
SD_BUS_RESULT("o", service_path),
bus_method_register_service,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("UnregisterService",
SD_BUS_ARGS("o", service_path),
SD_BUS_NO_RESULT,
bus_method_unregister_service,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("ResetStatistics",
SD_BUS_NO_ARGS,
SD_BUS_NO_RESULT,
bus_method_reset_statistics,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("FlushCaches",
SD_BUS_NO_ARGS,
SD_BUS_NO_RESULT,
bus_method_flush_caches,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("ResetServerFeatures",
SD_BUS_NO_ARGS,
SD_BUS_NO_RESULT,
bus_method_reset_server_features,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_VTABLE_END,
};
const BusObjectImplementation manager_object = {
"/org/freedesktop/resolve1",
"org.freedesktop.resolve1.Manager",
.vtables = BUS_VTABLES(resolve_vtable),
.children = BUS_IMPLEMENTATIONS(&link_object,
&dnssd_object),
};
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) {
bus_log_parse_error(r);
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 = bus_open_system_watch_bind_with_description(&m->bus, "bus-api-resolve");
if (r < 0)
return log_error_errno(r, "Failed to connect to system bus: %m");
r = bus_add_implementation(m->bus, &manager_object, m);
if (r < 0)
return r;
r = bus_log_control_api_register(m->bus);
if (r < 0)
return r;
r = sd_bus_request_name_async(m->bus, NULL, "org.freedesktop.resolve1", 0, NULL, NULL);
if (r < 0)
return log_error_errno(r, "Failed to request 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_match_signal_async(
m->bus,
NULL,
"org.freedesktop.login1",
"/org/freedesktop/login1",
"org.freedesktop.login1.Manager",
"PrepareForSleep",
match_prepare_for_sleep,
NULL,
m);
if (r < 0)
log_warning_errno(r, "Failed to request match for PrepareForSleep, ignoring: %m");
return 0;
}
int _manager_send_changed(Manager *manager, const char *property, ...) {
assert(manager);
if (sd_bus_is_ready(manager->bus) <= 0)
return 0;
char **l = strv_from_stdarg_alloca(property);
int r = sd_bus_emit_properties_changed_strv(
manager->bus,
"/org/freedesktop/resolve1",
"org.freedesktop.resolve1.Manager",
l);
if (r < 0)
log_notice_errno(r, "Failed to emit notification about changed property %s: %m", property);
return r;
}