/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2014 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see . ***/ #include "alloc-util.h" #include "bus-common-errors.h" #include "bus-util.h" #include "dns-domain.h" #include "resolved-bus.h" #include "resolved-def.h" static int reply_query_state(DnsQuery *q) { _cleanup_free_ char *ip = NULL; const char *name; int r; if (q->request_address_valid) { r = in_addr_to_string(q->request_family, &q->request_address, &ip); if (r < 0) return r; name = ip; } else name = dns_question_first_name(q->question); switch (q->state) { case DNS_TRANSACTION_NO_SERVERS: return sd_bus_reply_method_errorf(q->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->request, SD_BUS_ERROR_TIMEOUT, "Query timed out"); case DNS_TRANSACTION_ATTEMPTS_MAX_REACHED: return sd_bus_reply_method_errorf(q->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->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply"); case DNS_TRANSACTION_RESOURCES: return sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_RESOURCES, "Not enough resources"); case DNS_TRANSACTION_CONNECTION_FAILURE: return sd_bus_reply_method_errorf(q->request, BUS_ERROR_CONNECTION_FAILURE, "DNS server connection failure"); case DNS_TRANSACTION_ABORTED: return sd_bus_reply_method_errorf(q->request, BUS_ERROR_ABORTED, "Query aborted"); case DNS_TRANSACTION_DNSSEC_FAILED: return sd_bus_reply_method_errorf(q->request, BUS_ERROR_DNSSEC_FAILED, "DNSSEC validation failed: %s", dnssec_result_to_string(q->answer_dnssec_result)); 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", name); else { const char *rc, *n; char p[3]; /* the rcode is 4 bits long */ rc = dns_rcode_to_string(q->answer_rcode); if (!rc) { sprintf(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", name, rc); } return sd_bus_reply_method_error(q->request, &error); } case DNS_TRANSACTION_NULL: case DNS_TRANSACTION_PENDING: 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 *q) { _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *canonical = NULL; _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); 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; r = sd_bus_message_new_method_return(q->request, &reply); if (r < 0) goto finish; r = sd_bus_message_open_container(reply, 'a', "(iiay)"); 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, 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->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; /* Return the precise spelling and uppercasing and CNAME target reported by the server */ assert(canonical); r = sd_bus_message_append( reply, "st", DNS_RESOURCE_KEY_NAME(canonical->key), 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 hostname reply: %m"); sd_bus_reply_method_errno(q->request, r, NULL); } dns_query_free(q); } static int check_ifindex_flags(int ifindex, uint64_t *flags, uint64_t ok, sd_bus_error *error) { assert(flags); if (ifindex < 0) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index"); if (*flags & ~(SD_RESOLVED_PROTOCOLS_ALL|SD_RESOLVED_NO_CNAME|ok)) return sd_bus_error_setf(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; return 0; } static int bus_method_resolve_hostname(sd_bus_message *message, void *userdata, sd_bus_error *error) { _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL; Manager *m = userdata; const char *hostname; 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, "isit", &ifindex, &hostname, &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); 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 = check_ifindex_flags(ifindex, &flags, SD_RESOLVED_NO_SEARCH, error); if (r < 0) return r; r = dns_question_new_address(&question, family, hostname); if (r < 0) return r; r = dns_query_new(m, &q, question, ifindex, flags); if (r < 0) return r; q->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) goto fail; r = dns_query_go(q); if (r < 0) goto fail; return 1; fail: dns_query_free(q); return r; } static void bus_method_resolve_address_complete(DnsQuery *q) { _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; 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(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; r = sd_bus_message_new_method_return(q->request, &reply); if (r < 0) goto finish; r = sd_bus_message_open_container(reply, 'a', "(is)"); if (r < 0) goto finish; if (q->answer) { 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 = sd_bus_message_append(reply, "(is)", ifindex, rr->ptr.name); if (r < 0) goto finish; added ++; } } if (added <= 0) { _cleanup_free_ char *ip = NULL; in_addr_to_string(q->request_family, &q->request_address, &ip); 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)); 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 address reply: %m"); sd_bus_reply_method_errno(q->request, r, NULL); } dns_query_free(q); } static int bus_method_resolve_address(sd_bus_message *message, void *userdata, sd_bus_error *error) { _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL; Manager *m = userdata; int family, ifindex; uint64_t flags; const void *d; DnsQuery *q; size_t sz; int r; assert(message); assert(m); assert_cc(sizeof(int) == sizeof(int32_t)); r = sd_bus_message_read(message, "ii", &ifindex, &family); if (r < 0) return r; if (!IN_SET(family, AF_INET, AF_INET6)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family); r = sd_bus_message_read_array(message, 'y', &d, &sz); if (r < 0) return r; if (sz != FAMILY_ADDRESS_SIZE(family)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid address size"); r = sd_bus_message_read(message, "t", &flags); if (r < 0) return r; r = check_ifindex_flags(ifindex, &flags, 0, error); if (r < 0) return r; r = dns_question_new_reverse(&question, family, d); 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; memcpy(&q->request_address, d, sz); q->complete = bus_method_resolve_address_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 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 *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); 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) { bool has_root_domain = false; 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 (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 host name, 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->request, BUS_ERROR_NO_SUCH_SERVICE, "'%s' does not provide the requested service", dns_question_first_name(q->question)); goto finish; } } 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; }