resolved: add API for resolving specific RRs

4 files changed, 470 insertions, 80 deletions

diff --git a/src/resolve-host/resolve-host.c b/src/resolve-host/resolve-host.c
index 122c2622cf..1b1edaf6ec 100644
--- a/src/resolve-host/resolve-host.c
+++ b/src/resolve-host/resolve-host.c
@@ -31,10 +31,14 @@
 #include "af-list.h"
 #include "build.h"
 
+#include "resolved-dns-packet.h"
+
 #define DNS_CALL_TIMEOUT_USEC (45*USEC_PER_SEC)
 
 static int arg_family = AF_UNSPEC;
 static int arg_ifindex = 0;
+static uint16_t arg_type = 0;
+static uint16_t arg_class = 0;
 
 static int resolve_host(sd_bus *bus, const char *name) {
 
@@ -286,6 +290,103 @@ static int parse_address(const char *s, int *family, union in_addr_union *addres
         return 0;
 }
 
+static int resolve_record(sd_bus *bus, const char *name) {
+
+        _cleanup_bus_message_unref_ sd_bus_message *req = NULL, *reply = NULL;
+        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+        unsigned n = 0;
+        int r;
+
+        assert(name);
+
+        log_debug("Resolving %s %s %s.", name, dns_class_to_string(arg_class), dns_type_to_string(arg_type));
+
+        r = sd_bus_message_new_method_call(
+                        bus,
+                        &req,
+                        "org.freedesktop.resolve1",
+                        "/org/freedesktop/resolve1",
+                        "org.freedesktop.resolve1.Manager",
+                        "ResolveRecord");
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_message_set_auto_start(req, false);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_message_append(req, "sqq", name, arg_class, arg_type);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_call(bus, req, DNS_CALL_TIMEOUT_USEC, &error, &reply);
+        if (r < 0) {
+                log_error("%s: resolve call failed: %s", name, bus_error_message(&error, r));
+                return r;
+        }
+
+        r = sd_bus_message_enter_container(reply, 'a', "(qqay)");
+        if (r < 0)
+                return bus_log_parse_error(r);
+
+        while ((r = sd_bus_message_enter_container(reply, 'r', "qqay")) > 0) {
+                _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
+                _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
+                _cleanup_free_ char *s = NULL;
+                uint16_t c, t;
+                const void *d;
+                size_t l;
+
+                r = sd_bus_message_read(reply, "qq", &c, &t);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = sd_bus_message_read_array(reply, 'y', &d, &l);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = sd_bus_message_exit_container(reply);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = dns_packet_new(&p, DNS_PROTOCOL_DNS, 0);
+                if (r < 0)
+                        return log_oom();
+
+                r = dns_packet_append_blob(p, d, l, NULL);
+                if (r < 0)
+                        return log_oom();
+
+                r = dns_packet_read_rr(p, &rr, NULL);
+                if (r < 0) {
+                        log_error("Failed to parse RR.");
+                        return r;
+                }
+
+                r = dns_resource_record_to_string(rr, &s);
+                if (r < 0) {
+                        log_error("Failed to format RR.");
+                        return r;
+                }
+
+                printf("%s\n", s);
+                n++;
+        }
+        if (r < 0)
+                return bus_log_parse_error(r);
+
+        r = sd_bus_message_exit_container(reply);
+        if (r < 0)
+                return bus_log_parse_error(r);
+
+        if (n == 0) {
+                log_error("%s: no records found", name);
+                return -ESRCH;
+        }
+
+        return 0;
+}
+
 static void help(void) {
         printf("%s [OPTIONS...]\n\n"
                "Resolve IPv4 or IPv6 addresses.\n\n"
@@ -294,6 +395,8 @@ static void help(void) {
                "  -4                    Resolve IPv4 addresses\n"
                "  -6                    Resolve IPv6 addresses\n"
                "  -i INTERFACE          Filter by interface\n"
+               "  -t --type=TYPE        Query RR with DNS type\n"
+               "  -c --class=CLASS      Query RR with DNS class\n"
                , program_invocation_short_name);
 }
 
@@ -305,15 +408,17 @@ static int parse_argv(int argc, char *argv[]) {
         static const struct option options[] = {
                 { "help",        no_argument,       NULL, 'h'           },
                 { "version",     no_argument,       NULL, ARG_VERSION   },
+                { "type",        no_argument,       NULL, 't'           },
+                { "class",       no_argument,       NULL, 'c'           },
                 {}
         };
 
-        int c;
+        int c, r;
 
         assert(argc >= 0);
         assert(argv);
 
-        while ((c = getopt_long(argc, argv, "h46i:", options, NULL)) >= 0) {
+        while ((c = getopt_long(argc, argv, "h46i:t:c:", options, NULL)) >= 0) {
                 switch(c) {
 
                 case 'h':
@@ -337,7 +442,23 @@ static int parse_argv(int argc, char *argv[]) {
                         arg_ifindex = if_nametoindex(optarg);
                         if (arg_ifindex <= 0) {
                                 log_error("Unknown interfaces %s: %m", optarg);
-                                return -EINVAL;
+                                return -errno;
+                        }
+                        break;
+
+                case 't':
+                        r = dns_type_from_string(optarg, &arg_type);
+                        if (r < 0) {
+                                log_error("Failed to parse RR record type %s", optarg);
+                                return r;
+                        }
+                        break;
+
+                case 'c':
+                        r = dns_class_from_string(optarg, &arg_class);
+                        if (r < 0) {
+                                log_error("Failed to parse RR record class %s", optarg);
+                                return r;
                         }
                         break;
 
@@ -349,6 +470,14 @@ static int parse_argv(int argc, char *argv[]) {
                 }
         }
 
+        if (arg_type == 0 && arg_class != 0) {
+                log_error("--class= may only be used in conjunction with --type=");
+                return -EINVAL;
+        }
+
+        if (arg_type != 0 && arg_class == 0)
+                arg_class = DNS_CLASS_IN;
+
         return 1 /* work to do */;
 }
 
@@ -379,11 +508,15 @@ int main(int argc, char **argv) {
                 int family, ifindex, k;
                 union in_addr_union a;
 
-                k = parse_address(argv[optind], &family, &a, &ifindex);
-                if (k >= 0)
-                        k = resolve_address(bus, family, &a, ifindex);
-                else
-                        k = resolve_host(bus, argv[optind]);
+                if (arg_type != 0)
+                        k = resolve_record(bus, argv[optind]);
+                else {
+                        k = parse_address(argv[optind], &family, &a, &ifindex);
+                        if (k >= 0)
+                                k = resolve_address(bus, family, &a, ifindex);
+                        else
+                                k = resolve_host(bus, argv[optind]);
+                }
 
                 if (r == 0)
                         r = k;
diff --git a/src/resolve/resolved-bus.c b/src/resolve/resolved-bus.c
index d0c21894e3..0b8ecf1b82 100644
--- a/src/resolve/resolved-bus.c
+++ b/src/resolve/resolved-bus.c
@@ -157,13 +157,13 @@ static void bus_method_resolve_hostname_complete(DnsQuery *q) {
                 for (i = 0; i < answer->n_rrs; i++) {
                         r = dns_question_matches_rr(q->question, answer->rrs[i]);
                         if (r < 0)
-                                goto parse_fail;
+                                goto finish;
                         if (r == 0) {
                                 /* Hmm, if this is not an address record,
                                    maybe it's a cname? If so, remember this */
                                 r = dns_question_matches_cname(q->question, answer->rrs[i]);
                                 if (r < 0)
-                                        goto parse_fail;
+                                        goto finish;
                                 if (r > 0)
                                         cname = dns_resource_record_ref(answer->rrs[i]);
 
@@ -204,7 +204,7 @@ static void bus_method_resolve_hostname_complete(DnsQuery *q) {
                 for (i = 0; i < answer->n_rrs; i++) {
                         r = dns_question_matches_rr(q->question, answer->rrs[i]);
                         if (r < 0)
-                                goto parse_fail;
+                                goto finish;
                         if (r == 0)
                                 continue;
 
@@ -230,6 +230,7 @@ static void bus_method_resolve_hostname_complete(DnsQuery *q) {
                                 r = sd_bus_reply_method_errno(q->request, -r, NULL);
                                 goto finish;
                         }
+
                         return;
                 }
         }
@@ -245,14 +246,12 @@ static void bus_method_resolve_hostname_complete(DnsQuery *q) {
                 goto finish;
 
         r = sd_bus_send(q->manager->bus, reply, NULL);
-        goto finish;
-
-parse_fail:
-        r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
 
 finish:
-        if (r < 0)
-                log_error("Failed to send bus reply: %s", strerror(-r));
+        if (r < 0) {
+                log_error("Failed to send hostname reply: %s", strerror(-r));
+                sd_bus_reply_method_errno(q->request, -r, NULL);
+        }
 
         dns_query_free(q);
 }
@@ -356,7 +355,7 @@ static void bus_method_resolve_address_complete(DnsQuery *q) {
                 for (i = 0; i < answer->n_rrs; i++) {
                         r = dns_question_matches_rr(q->question, answer->rrs[i]);
                         if (r < 0)
-                                goto parse_fail;
+                                goto finish;
                         if (r == 0)
                                 continue;
 
@@ -382,14 +381,12 @@ static void bus_method_resolve_address_complete(DnsQuery *q) {
                 goto finish;
 
         r = sd_bus_send(q->manager->bus, reply, NULL);
-        goto finish;
-
-parse_fail:
-        r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
 
 finish:
-        if (r < 0)
-                log_error("Failed to send bus reply: %s", strerror(-r));
+        if (r < 0) {
+                log_error("Failed to send address reply: %s", strerror(-r));
+                sd_bus_reply_method_errno(q->request, -r, NULL);
+        }
 
         dns_query_free(q);
 }
@@ -469,10 +466,144 @@ static int bus_method_resolve_address(sd_bus *bus, sd_bus_message *message, void
         return 1;
 }
 
+static void bus_method_resolve_record_complete(DnsQuery *q) {
+        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
+        unsigned added = 0, i;
+        int r;
+
+        assert(q);
+
+        if (q->state != DNS_QUERY_SUCCESS) {
+                r = reply_query_state(q);
+                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', "(qqay)");
+        if (r < 0)
+                goto finish;
+
+        if (q->answer) {
+                answer = dns_answer_ref(q->answer);
+
+                for (i = 0; i < answer->n_rrs; i++) {
+                        _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
+                        size_t start;
+
+                        r = dns_question_matches_rr(q->question, answer->rrs[i]);
+                        if (r < 0)
+                                goto finish;
+                        if (r == 0)
+                                continue;
+
+                        r = dns_packet_new(&p, DNS_PROTOCOL_DNS, 0);
+                        if (r < 0)
+                                goto finish;
+
+                        r = dns_packet_append_rr(p, answer->rrs[i], &start);
+                        if (r < 0)
+                                goto finish;
+
+                        r = sd_bus_message_open_container(reply, 'r', "qqay");
+                        if (r < 0)
+                                goto finish;
+
+                        r = sd_bus_message_append(reply, "qq", answer->rrs[i]->key->class, answer->rrs[i]->key->type);
+                        if (r < 0)
+                                goto finish;
+
+                        r = sd_bus_message_append_array(reply, 'y', DNS_PACKET_DATA(p) + start, p->size - start);
+                        if (r < 0)
+                                goto finish;
+
+                        r = sd_bus_message_close_container(reply);
+                        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", q->request_hostname);
+                goto finish;
+        }
+
+        r = sd_bus_message_close_container(reply);
+        if (r < 0)
+                goto finish;
+
+        r = sd_bus_send(q->manager->bus, reply, NULL);
+
+finish:
+        if (r < 0) {
+                log_error("Failed to send record reply: %s", strerror(-r));
+                sd_bus_reply_method_errno(q->request, -r, NULL);
+        }
+
+        dns_query_free(q);
+}
+
+static int bus_method_resolve_record(sd_bus *bus, 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_free_ char *reverse = NULL;
+        Manager *m = userdata;
+        DnsQuery *q;
+        int r;
+        uint16_t class, type;
+        const char *name;
+
+        assert(bus);
+        assert(message);
+        assert(m);
+
+        r = sd_bus_message_read(message, "sqq", &name, &class, &type);
+        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);
+        if (r < 0)
+                return r;
+
+        q->request = sd_bus_message_ref(message);
+        q->request_hostname = name;
+        q->complete = bus_method_resolve_record_complete;
+
+        r = dns_query_go(q);
+        if (r < 0) {
+                dns_query_free(q);
+
+                if (r == -ESRCH)
+                        sd_bus_error_setf(error, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");
+
+                return r;
+        }
+
+        return 1;
+}
+
 static const sd_bus_vtable resolve_vtable[] = {
         SD_BUS_VTABLE_START(0),
         SD_BUS_METHOD("ResolveHostname", "si", "a(iayi)s", bus_method_resolve_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("ResolveAddress", "iayi", "as", bus_method_resolve_address, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("ResolveRecord", "sqq", "a(qqay)", bus_method_resolve_record, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_VTABLE_END,
 };
 
diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c
index 8b8858848c..e1200c9bc0 100644
--- a/src/resolve/resolved-dns-rr.c
+++ b/src/resolve/resolved-dns-rr.c
@@ -159,6 +159,31 @@ int dns_resource_key_compare_func(const void *a, const void *b) {
         return 0;
 }
 
+int dns_resource_key_to_string(const DnsResourceKey *key, char **ret) {
+        char cbuf[DECIMAL_STR_MAX(uint16_t)], tbuf[DECIMAL_STR_MAX(uint16_t)];
+        const char *c, *t;
+        char *s;
+
+        c = dns_class_to_string(key->class);
+        if (!c) {
+                sprintf(cbuf, "%i", key->class);
+                c = cbuf;
+        }
+
+        t = dns_type_to_string(key->type);
+        if (!t){
+                sprintf(tbuf, "%i", key->type);
+                t = tbuf;
+        }
+
+        s = strjoin(DNS_RESOURCE_KEY_NAME(key), " ", c, " ", t, NULL);
+        if (!s)
+                return -ENOMEM;
+
+        *ret = s;
+        return 0;
+}
+
 DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key) {
         DnsResourceRecord *rr;
 
@@ -267,16 +292,24 @@ int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecor
         if (r <= 0)
                 return r;
 
-        if (IN_SET(a->key->type, DNS_TYPE_PTR, DNS_TYPE_NS, DNS_TYPE_CNAME))
+        switch (a->key->type) {
+
+        case DNS_TYPE_PTR:
+        case DNS_TYPE_NS:
+        case DNS_TYPE_CNAME:
                 return dns_name_equal(a->ptr.name, b->ptr.name);
-        else if (a->key->type == DNS_TYPE_HINFO)
-                return strcasecmp(a->hinfo.cpu, b->hinfo.cpu) == 0 &&
-                       strcasecmp(a->hinfo.os, b->hinfo.os) == 0;
-        else if (a->key->type == DNS_TYPE_A)
+
+        case DNS_TYPE_HINFO:
+                return strcaseeq(a->hinfo.cpu, b->hinfo.cpu) &&
+                       strcaseeq(a->hinfo.os, b->hinfo.os);
+
+        case DNS_TYPE_A:
                 return memcmp(&a->a.in_addr, &b->a.in_addr, sizeof(struct in_addr)) == 0;
-        else if (a->key->type == DNS_TYPE_AAAA)
+
+        case DNS_TYPE_AAAA:
                 return memcmp(&a->aaaa.in6_addr, &b->aaaa.in6_addr, sizeof(struct in6_addr)) == 0;
-        else if (a->key->type == DNS_TYPE_SOA) {
+
+        case DNS_TYPE_SOA:
                 r = dns_name_equal(a->soa.mname, b->soa.mname);
                 if (r <= 0)
                         return r;
@@ -289,83 +322,171 @@ int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecor
                        a->soa.retry   == b->soa.retry &&
                        a->soa.expire  == b->soa.expire &&
                        a->soa.minimum == b->soa.minimum;
-        } else
+        default:
                 return a->generic.size == b->generic.size &&
                         memcmp(a->generic.data, b->generic.data, a->generic.size) == 0;
+        }
 }
 
-const char *dns_class_to_string(uint16_t class) {
+int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
+        _cleanup_free_ char *k = NULL;
+        char *s;
+        int r;
 
-        switch (class) {
+        assert(rr);
 
-        case DNS_CLASS_IN:
-                return "IN";
+        r = dns_resource_key_to_string(rr->key, &k);
+        if (r < 0)
+                return r;
 
-        case DNS_CLASS_ANY:
-                return "ANY";
-        }
+        switch (rr->key->type) {
 
-        return NULL;
-}
+        case DNS_TYPE_PTR:
+        case DNS_TYPE_NS:
+        case DNS_TYPE_CNAME:
+                s = strjoin(k, " ", rr->ptr.name, NULL);
+                if (!s)
+                        return -ENOMEM;
 
-const char *dns_type_to_string(uint16_t type) {
+                break;
 
-        switch (type) {
+        case DNS_TYPE_HINFO:
+                s = strjoin(k, " ", rr->hinfo.cpu, " ", rr->hinfo.os, NULL);
+                if (!s)
+                        return -ENOMEM;
+                break;
 
-        case DNS_TYPE_A:
-                return "A";
+        case DNS_TYPE_A: {
+                _cleanup_free_ char *x = NULL;
 
-        case DNS_TYPE_NS:
-                return "NS";
+                r = in_addr_to_string(AF_INET, (const union in_addr_union*) &rr->a.in_addr, &x);
+                if (r < 0)
+                        return r;
 
-        case DNS_TYPE_CNAME:
-                return "CNAME";
+                s = strjoin(k, " ", x, NULL);
+                if (!s)
+                        return -ENOMEM;
+                break;
+        }
 
-        case DNS_TYPE_SOA:
-                return "SOA";
+        case DNS_TYPE_AAAA: {
+                _cleanup_free_ char *x = NULL;
 
-        case DNS_TYPE_PTR:
-                return "PTR";
+                r = in_addr_to_string(AF_INET6, (const union in_addr_union*) &rr->aaaa.in6_addr, &x);
+                if (r < 0)
+                        return r;
 
-        case DNS_TYPE_HINFO:
-                return "HINFO";
+                s = strjoin(k, " ", x, NULL);
+                if (!s)
+                        return -ENOMEM;
+                break;
+        }
 
-        case DNS_TYPE_MX:
-                return "MX";
+        case DNS_TYPE_SOA:
+                r = asprintf(&s, "%s %s %s %u %u %u %u %u",
+                             k,
+                             strna(rr->soa.mname),
+                             strna(rr->soa.rname),
+                             rr->soa.serial,
+                             rr->soa.refresh,
+                             rr->soa.retry,
+                             rr->soa.expire,
+                             rr->soa.minimum);
+                if (r < 0)
+                        return -ENOMEM;
+                break;
+
+        default: {
+                _cleanup_free_ char *x = NULL;
+
+                x = hexmem(rr->generic.data, rr->generic.size);
+                if (!x)
+                        return -ENOMEM;
+
+                s = strjoin(k, " ", x, NULL);
+                if (!s)
+                        return -ENOMEM;
+                break;
+        }}
+
+        *ret = s;
+        return 0;
+}
 
-        case DNS_TYPE_TXT:
-                return "TXT";
+const char *dns_class_to_string(uint16_t class) {
 
-        case DNS_TYPE_AAAA:
-                return "AAAA";
+        switch (class) {
 
-        case DNS_TYPE_SRV:
-                return "SRV";
+        case DNS_CLASS_IN:
+                return "IN";
 
-        case DNS_TYPE_SSHFP:
-                return "SSHFP";
+        case DNS_CLASS_ANY:
+                return "ANY";
+        }
 
-        case DNS_TYPE_DNAME:
-                return "DNAME";
+        return NULL;
+}
 
-        case DNS_TYPE_ANY:
-                return "ANY";
+int dns_class_from_string(const char *s, uint16_t *class) {
+        assert(s);
+        assert(class);
+
+        if (strcaseeq(s, "IN"))
+                *class = DNS_CLASS_IN;
+        else if (strcaseeq(s, "ANY"))
+                *class = DNS_TYPE_ANY;
+        else
+                return -EINVAL;
 
-        case DNS_TYPE_OPT:
-                return "OPT";
+        return 0;
+}
 
-        case DNS_TYPE_TKEY:
-                return "TKEY";
+static const struct {
+        uint16_t type;
+        const char *name;
+} dns_types[] = {
+        { DNS_TYPE_A,     "A"     },
+        { DNS_TYPE_NS,    "NS"    },
+        { DNS_TYPE_CNAME, "CNAME" },
+        { DNS_TYPE_SOA,   "SOA"   },
+        { DNS_TYPE_PTR,   "PTR"   },
+        { DNS_TYPE_HINFO, "HINFO" },
+        { DNS_TYPE_MX,    "MX"    },
+        { DNS_TYPE_TXT,   "TXT"   },
+        { DNS_TYPE_AAAA,  "AAAA"  },
+        { DNS_TYPE_SRV,   "SRV"   },
+        { DNS_TYPE_SSHFP, "SSHFP" },
+        { DNS_TYPE_DNAME, "DNAME" },
+        { DNS_TYPE_ANY,   "ANY"   },
+        { DNS_TYPE_OPT,   "OPT"   },
+        { DNS_TYPE_TKEY,  "TKEY"  },
+        { DNS_TYPE_TSIG,  "TSIG"  },
+        { DNS_TYPE_IXFR,  "IXFR"  },
+        { DNS_TYPE_AXFR,  "AXFR"  },
+};
 
-        case DNS_TYPE_TSIG:
-                return "TSIG";
 
-        case DNS_TYPE_IXFR:
-                return "IXFR";
+const char *dns_type_to_string(uint16_t type) {
+        unsigned i;
 
-        case DNS_TYPE_AXFR:
-                return "AXFR";
-        }
+        for (i = 0; i < ELEMENTSOF(dns_types); i++)
+                if (dns_types[i].type == type)
+                        return dns_types[i].name;
 
         return NULL;
 }
+
+int dns_type_from_string(const char *s, uint16_t *type) {
+        unsigned i;
+
+        assert(s);
+        assert(type);
+
+        for (i = 0; i < ELEMENTSOF(dns_types); i++)
+                if (strcaseeq(dns_types[i].name, s)) {
+                        *type = dns_types[i].type;
+                        return 0;
+                }
+
+        return -EINVAL;
+}
diff --git a/src/resolve/resolved-dns-rr.h b/src/resolve/resolved-dns-rr.h
index 50bb74c67b..524630071d 100644
--- a/src/resolve/resolved-dns-rr.h
+++ b/src/resolve/resolved-dns-rr.h
@@ -137,6 +137,7 @@ int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord
 int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr);
 unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]);
 int dns_resource_key_compare_func(const void *a, const void *b);
+int dns_resource_key_to_string(const DnsResourceKey *key, char **ret);
 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref);
 
 DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key);
@@ -145,7 +146,11 @@ DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr);
 DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr);
 int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *name);
 int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b);
+int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret);
 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);
 
 const char *dns_type_to_string(uint16_t type);
+int dns_type_from_string(const char *name, uint16_t *type);
+
 const char *dns_class_to_string(uint16_t type);
+int dns_class_from_string(const char *name, uint16_t *class);