resolved: add a DNS client stub resolver

Let's turn resolved into a something truly useful: a fully asynchronous
DNS stub resolver that subscribes to network changes.

(More to come: caching, LLMNR, mDNS/DNS-SD, DNSSEC, IDN, NSS module)

20 files changed, 4225 insertions, 165 deletions

diff --git a/src/resolve/resolved-bus.c b/src/resolve/resolved-bus.c
new file mode 100644
index 0000000000..4a011efc4d
--- /dev/null
+++ b/src/resolve/resolved-bus.c
@@ -0,0 +1,468 @@
+/*-*- 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 <http://www.gnu.org/licenses/>.
+***/
+
+#include "bus-errors.h"
+#include "bus-util.h"
+
+#include "resolved.h"
+#include "resolved-dns-domain.h"
+
+static void bus_method_resolve_hostname_complete(DnsQuery *q) {
+        int r;
+
+        assert(q);
+
+        switch(q->state) {
+
+        case DNS_QUERY_SKIPPED:
+                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_NAME_SERVERS, "Not appropriate name servers or networks found");
+                break;
+
+        case DNS_QUERY_TIMEOUT:
+                r = sd_bus_reply_method_errorf(q->request, SD_BUS_ERROR_TIMEOUT, "Query timed out");
+                break;
+
+        case DNS_QUERY_ATTEMPTS_MAX:
+                r = sd_bus_reply_method_errorf(q->request, SD_BUS_ERROR_TIMEOUT, "All attempts to contact name servers or networks failed");
+                break;
+
+        case DNS_QUERY_FAILURE: {
+                _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+
+                if (q->rcode == DNS_RCODE_NXDOMAIN)
+                        sd_bus_error_setf(&error, _BUS_ERROR_DNS "NXDOMAIN", "Hostname %s does not exist", q->request_hostname);
+                else {
+                        const char *rc, *n;
+                        char p[DECIMAL_STR_MAX(q->rcode)];
+
+                        rc = dns_rcode_to_string(q->rcode);
+                        if (!rc) {
+                                sprintf(p, "%i", q->rcode);
+                                rc = p;
+                        }
+
+                        n = strappenda(_BUS_ERROR_DNS, rc);
+
+                        sd_bus_error_setf(&error, n, "Could not resolve hostname %s, server or network returned error %s", q->request_hostname, rc);
+                }
+
+                r = sd_bus_reply_method_error(q->request, &error);
+                break;
+        }
+
+        case DNS_QUERY_SUCCESS: {
+                _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+                unsigned i, n, added = 0;
+
+                assert(q->packet);
+
+                r = dns_packet_skip_question(q->packet);
+                if (r < 0)
+                        goto parse_fail;
+
+                r = sd_bus_message_new_method_return(q->request, &reply);
+                if (r < 0)
+                        goto finish;
+
+                r = sd_bus_message_open_container(reply, 'a', "(yayi)");
+                if (r < 0)
+                        goto finish;
+
+                n = be16toh(DNS_PACKET_HEADER(q->packet)->ancount) +
+                    be16toh(DNS_PACKET_HEADER(q->packet)->nscount) +
+                    be16toh(DNS_PACKET_HEADER(q->packet)->arcount);
+
+                for (i = 0; i < n; i++) {
+                        _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
+
+                        r = dns_packet_read_rr(q->packet, &rr, NULL);
+                        if (r < 0)
+                                goto parse_fail;
+
+                        if (rr->key.class != DNS_CLASS_IN)
+                                continue;
+
+                        if (!(q->request_family != AF_INET6 && rr->key.type == DNS_TYPE_A) &&
+                            !(q->request_family != AF_INET && rr->key.type == DNS_TYPE_AAAA))
+                                continue;
+
+                        if (!dns_name_equal(rr->key.name, q->request_hostname))
+                                continue;
+
+                        r = sd_bus_message_open_container(reply, 'r', "yayi");
+                        if (r < 0)
+                                goto finish;
+
+                        if (rr->key.type == DNS_TYPE_A) {
+                                r = sd_bus_message_append(reply, "y", AF_INET);
+                                if (r < 0)
+                                        goto finish;
+
+                                r = sd_bus_message_append_array(reply, 'y', &rr->a.in_addr, sizeof(struct in_addr));
+                        } else {
+                                r = sd_bus_message_append(reply, "y", AF_INET6);
+                                if (r < 0)
+                                        goto finish;
+
+                                r = sd_bus_message_append_array(reply, 'y', &rr->aaaa.in6_addr, sizeof(struct in6_addr));
+                        }
+                        if (r < 0)
+                                goto finish;
+
+                        r = sd_bus_message_append(reply, "i", q->packet->ifindex);
+                        if (r < 0)
+                                goto finish;
+
+                        r = sd_bus_message_close_container(reply);
+                        if (r < 0)
+                                goto finish;
+
+                        added ++;
+                }
+
+                if (added <= 0)
+                        goto parse_fail;
+
+                r = sd_bus_message_close_container(reply);
+                if (r < 0)
+                        goto finish;
+
+                r = sd_bus_send(q->manager->bus, reply, NULL);
+                break;
+        }
+
+        parse_fail:
+        case DNS_QUERY_INVALID_REPLY:
+                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
+                break;
+
+        case DNS_QUERY_NULL:
+        case DNS_QUERY_SENT:
+                assert_not_reached("Unexpected query state");
+        }
+
+finish:
+        if (r < 0)
+                log_error("Failed to send bus reply: %s", strerror(-r));
+
+        dns_query_free(q);
+}
+
+static int bus_method_resolve_hostname(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        Manager *m = userdata;
+        const char *hostname;
+        uint8_t family;
+        DnsResourceKey keys[2];
+        DnsQuery *q;
+        unsigned n = 0;
+        int r;
+
+        assert(bus);
+        assert(message);
+        assert(m);
+
+        r = sd_bus_message_read(message, "sy", &hostname, &family);
+        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 %u", family);
+
+        if (!hostname_is_valid(hostname))
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", hostname);
+
+        if (family != AF_INET6) {
+                keys[n].class = DNS_CLASS_IN;
+                keys[n].type = DNS_TYPE_A;
+                keys[n].name = (char*) hostname;
+                n++;
+        }
+
+        if (family != AF_INET) {
+                keys[n].class = DNS_CLASS_IN;
+                keys[n].type = DNS_TYPE_AAAA;
+                keys[n].name = (char*) hostname;
+                n++;
+        }
+
+        r = dns_query_new(m, &q, keys, n);
+        if (r < 0)
+                return r;
+
+        q->request = sd_bus_message_ref(message);
+        q->request_family = family;
+        q->request_hostname = hostname;
+        q->complete = bus_method_resolve_hostname_complete;
+
+        r = dns_query_start(q);
+        if (r < 0) {
+                dns_query_free(q);
+                return r;
+        }
+
+        return 1;
+}
+
+static void bus_method_resolve_address_complete(DnsQuery *q) {
+        _cleanup_free_ char *ip = NULL;
+        int r;
+
+        assert(q);
+
+        in_addr_to_string(q->request_family, &q->request_address, &ip);
+
+        switch(q->state) {
+
+        case DNS_QUERY_SKIPPED:
+                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_NAME_SERVERS, "Not appropriate name servers or networks found");
+                break;
+
+        case DNS_QUERY_TIMEOUT:
+                r = sd_bus_reply_method_errorf(q->request, SD_BUS_ERROR_TIMEOUT, "Query timed out");
+                break;
+
+        case DNS_QUERY_ATTEMPTS_MAX:
+                r = sd_bus_reply_method_errorf(q->request, SD_BUS_ERROR_TIMEOUT, "All attempts to contact name servers or networks failed");
+                break;
+
+        case DNS_QUERY_FAILURE: {
+                _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+
+                if (q->rcode == DNS_RCODE_NXDOMAIN)
+                        sd_bus_error_setf(&error, _BUS_ERROR_DNS "NXDOMAIN", "No hostname known for address %s ", ip);
+                else {
+                        const char *rc, *n;
+                        char p[DECIMAL_STR_MAX(q->rcode)];
+
+                        rc = dns_rcode_to_string(q->rcode);
+                        if (!rc) {
+                                sprintf(p, "%i", q->rcode);
+                                rc = p;
+                        }
+
+                        n = strappenda(_BUS_ERROR_DNS, rc);
+
+                        sd_bus_error_setf(&error, n, "Could not resolve address %s, server or network returned error %s", ip, rc);
+                }
+
+                r = sd_bus_reply_method_error(q->request, &error);
+                break;
+        }
+
+        case DNS_QUERY_SUCCESS: {
+                _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+                unsigned i, n, added = 0;
+                _cleanup_free_ char *reverse = NULL;
+
+                assert(q->packet);
+
+                r = dns_name_reverse(q->request_family, &q->request_address, &reverse);
+                if (r < 0)
+                        goto finish;
+
+                r = dns_packet_skip_question(q->packet);
+                if (r < 0)
+                        goto parse_fail;
+
+                r = sd_bus_message_new_method_return(q->request, &reply);
+                if (r < 0)
+                        goto finish;
+
+                r = sd_bus_message_open_container(reply, 'a', "s");
+                if (r < 0)
+                        goto finish;
+
+                n = be16toh(DNS_PACKET_HEADER(q->packet)->ancount) +
+                    be16toh(DNS_PACKET_HEADER(q->packet)->nscount) +
+                    be16toh(DNS_PACKET_HEADER(q->packet)->arcount);
+
+                for (i = 0; i < n; i++) {
+                        _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
+
+                        r = dns_packet_read_rr(q->packet, &rr, NULL);
+                        if (r < 0)
+                                goto parse_fail;
+
+                        if (rr->key.class != DNS_CLASS_IN)
+                                continue;
+                        if (rr->key.type != DNS_TYPE_PTR)
+                                continue;
+                        if (!dns_name_equal(rr->key.name, reverse))
+                                continue;
+
+                        r = sd_bus_message_append(reply, "s", rr->ptr.name);
+                        if (r < 0)
+                                goto finish;
+
+                        added ++;
+                }
+
+                if (added <= 0)
+                        goto parse_fail;
+
+                r = sd_bus_message_close_container(reply);
+                if (r < 0)
+                        goto finish;
+
+                r = sd_bus_send(q->manager->bus, reply, NULL);
+                break;
+        }
+
+        parse_fail:
+        case DNS_QUERY_INVALID_REPLY:
+                r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
+                break;
+
+        case DNS_QUERY_NULL:
+        case DNS_QUERY_SENT:
+                assert_not_reached("Unexpected query state");
+        }
+
+finish:
+        if (r < 0)
+                log_error("Failed to send bus reply: %s", strerror(-r));
+
+        dns_query_free(q);
+}
+
+static int bus_method_resolve_address(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        _cleanup_(dns_resource_key_free) DnsResourceKey key = {};
+        Manager *m = userdata;
+        uint8_t family;
+        const void *d;
+        int ifindex;
+        DnsQuery *q;
+        size_t sz;
+        int r;
+
+        assert(bus);
+        assert(message);
+        assert(m);
+
+        r = sd_bus_message_read(message, "y", &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 %u", family);
+
+        r = sd_bus_message_read_array(message, 'y', &d, &sz);
+        if (r < 0)
+                return r;
+
+        if ((family == AF_INET && sz != sizeof(struct in_addr)) ||
+            (family == AF_INET6 && sz != sizeof(struct in6_addr)))
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid address size");
+
+        r = sd_bus_message_read(message, "i", &ifindex);
+        if (r < 0)
+                return r;
+        if (ifindex < 0)
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");
+
+        key.class = DNS_CLASS_IN;
+        key.type = DNS_TYPE_PTR;
+        r = dns_name_reverse(family, d, &key.name);
+        if (r < 0)
+                return r;
+
+        r = dns_query_new(m, &q, &key, 1);
+        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_start(q);
+        if (r < 0) {
+                dns_query_free(q);
+                return r;
+        }
+
+        return 1;
+}
+
+static const sd_bus_vtable resolve_vtable[] = {
+        SD_BUS_VTABLE_START(0),
+        SD_BUS_METHOD("ResolveHostname", "sy", "a(yayi)", bus_method_resolve_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("ResolveAddress", "yayi", "as", bus_method_resolve_address, SD_BUS_VTABLE_UNPRIVILEGED),
+        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;
+}
+
+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("Failed to connect to bus, trying again in 5s: %s", strerror(-r));
+
+                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) {
+                        log_error("Failed to install bus reconnect time event: %s", strerror(-r));
+                        return r;
+                }
+
+                return 0;
+        }
+
+        r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/resolve1", "org.freedesktop.resolve1", resolve_vtable, m);
+        if (r < 0) {
+                log_error("Failed to register object: %s", strerror(-r));
+                return r;
+        }
+
+        r = sd_bus_request_name(m->bus, "org.freedesktop.resolve1", 0);
+        if (r < 0) {
+                log_error("Failed to register name: %s", strerror(-r));
+                return r;
+        }
+
+        r = sd_bus_attach_event(m->bus, m->event, 0);
+        if (r < 0) {
+                log_error("Failed to attach bus to event loop: %s", strerror(-r));
+                return r;
+        }
+
+        return 0;
+}
diff --git a/src/resolve/resolved-dns-domain.c b/src/resolve/resolved-dns-domain.c
new file mode 100644
index 0000000000..94ffc0fac4
--- /dev/null
+++ b/src/resolve/resolved-dns-domain.c
@@ -0,0 +1,381 @@
+/*-*- 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 <http://www.gnu.org/licenses/>.
+ ***/
+
+#include "resolved-dns-domain.h"
+
+int dns_label_unescape(const char **name, char *dest, size_t sz) {
+        const char *n;
+        char *d;
+        int r = 0;
+
+        assert(name);
+        assert(*name);
+        assert(dest);
+
+        n = *name;
+        d = dest;
+
+        for (;;) {
+                if (*n == '.') {
+                        n++;
+                        break;
+                }
+
+                if (*n == 0)
+                        break;
+
+                if (sz <= 0)
+                        return -ENOSPC;
+
+                if (*n == '\\') {
+                        /* Escaped character */
+
+                        n++;
+
+                        if (*n == 0)
+                                /* Ending NUL */
+                                return -EINVAL;
+
+                        else if (*n == '\\' || *n == '.') {
+                                /* Escaped backslash or dot */
+                                *(d++) = *(n++);
+                                sz--;
+                                r++;
+
+                        } else if (n[0] >= '0' && n[0] <= '9') {
+                                unsigned k;
+
+                                /* Escaped literal ASCII character */
+
+                                if (!(n[1] >= '0' && n[1] <= '9') ||
+                                    !(n[2] >= '0' && n[2] <= '9'))
+                                        return -EINVAL;
+
+                                k = ((unsigned) (n[0] - '0') * 100) +
+                                        ((unsigned) (n[1] - '0') * 10) +
+                                        ((unsigned) (n[2] - '0'));
+
+                                /* Don't allow CC characters or anything that doesn't fit in 8bit */
+                                if (k < ' ' || k > 255 || k == 127)
+                                        return -EINVAL;
+
+                                *(d++) = (char) k;
+                                sz--;
+                                r++;
+
+                                n += 3;
+                        } else
+                                return -EINVAL;
+
+                } else if (*n >= ' ' && *n != 127) {
+
+                        /* Normal character */
+                        *(d++) = *(n++);
+                        sz--;
+                        r++;
+                } else
+                        return -EINVAL;
+        }
+
+        /* Empty label that is not at the end? */
+        if (r == 0 && *n)
+                return -EINVAL;
+
+        if (sz >= 1)
+                *d = 0;
+
+        *name = n;
+        return r;
+}
+
+int dns_label_escape(const char *p, size_t l, char **ret) {
+        _cleanup_free_ char *s = NULL;
+        char *q;
+        int r;
+
+        assert(p);
+        assert(ret);
+
+        s = malloc(l * 4 + 1);
+        if (!s)
+                return -ENOMEM;
+
+        q = s;
+        while (l > 0) {
+
+                if (*p == '.' || *p == '\\') {
+
+                        /* Dot or backslash */
+                        *(q++) = '\\';
+                        *(q++) = *p;
+
+                } else if (*p == '_' ||
+                           *p == '-' ||
+                           (*p >= '0' && *p <= '9') ||
+                           (*p >= 'a' && *p <= 'z') ||
+                           (*p >= 'A' && *p <= 'Z')) {
+
+                        /* Proper character */
+                        *(q++) = *p;
+                } else if (*p >= ' ' && *p != 127) {
+
+                        /* Everything else */
+                        *(q++) = '\\';
+                        *(q++) = '0' + (char) ((unsigned) *p / 100);
+                        *(q++) = '0' + (char) (((unsigned) *p / 10) % 10);
+                        *(q++) = '0' + (char) ((unsigned) *p % 10);
+
+                } else
+                        return -EINVAL;
+
+                p++;
+                l--;
+        }
+
+        *q = 0;
+        *ret = s;
+        r = q - s;
+        s = NULL;
+
+        return r;
+}
+
+int dns_name_normalize(const char *s, char **_ret) {
+        _cleanup_free_ char *ret = NULL;
+        size_t n = 0, allocated = 0;
+        const char *p = s;
+        bool first = true;
+        int r;
+
+        assert(s);
+        assert(_ret);
+
+        for (;;) {
+                _cleanup_free_ char *t = NULL;
+                char label[DNS_LABEL_MAX];
+
+                r = dns_label_unescape(&p, label, sizeof(label));
+                if (r < 0)
+                        return r;
+                if (r == 0) {
+                        if (*p != 0)
+                                return -EINVAL;
+                        break;
+                }
+
+                r = dns_label_escape(label, r, &t);
+                if (r < 0)
+                        return r;
+
+                if (!GREEDY_REALLOC(ret, allocated, n + !first + strlen(t) + 1))
+                        return -ENOMEM;
+
+                if (!first)
+                        ret[n++] = '.';
+                else
+                        first = false;
+
+                memcpy(ret + n, t, r);
+                n += r;
+        }
+
+        if (!GREEDY_REALLOC(ret, allocated, n + 1))
+                return -ENOMEM;
+
+        ret[n] = 0;
+        *_ret = ret;
+        ret = NULL;
+
+        return 0;
+}
+
+unsigned long dns_name_hash_func(const void *s, const uint8_t hash_key[HASH_KEY_SIZE]) {
+        const char *p = s;
+        unsigned long ul = 0;
+        int r;
+
+        assert(p);
+
+        while (*p) {
+                char label[DNS_LABEL_MAX+1];
+
+                r = dns_label_unescape(&p, label, sizeof(label));
+                if (r < 0)
+                        break;
+
+                label[r] = 0;
+                ascii_strlower(label);
+
+                ul = hash_key[0] * ul + ul + string_hash_func(label, hash_key);
+        }
+
+        return ul;
+}
+
+int dns_name_compare_func(const void *a, const void *b) {
+        const char *x = a, *y = b;
+        int r, q;
+
+        assert(a);
+        assert(b);
+
+        for (;;) {
+                char la[DNS_LABEL_MAX+1], lb[DNS_LABEL_MAX+1];
+
+                if (*x == 0 && *y == 0)
+                        return 0;
+
+                r = dns_label_unescape(&x, la, sizeof(la));
+                q = dns_label_unescape(&y, lb, sizeof(lb));
+                if (r < 0 || q < 0)
+                        return r - q;
+
+                la[r] = lb[q] = 0;
+                r = strcasecmp(la, lb);
+                if (r != 0)
+                        return r;
+        }
+}
+
+int dns_name_equal(const char *x, const char *y) {
+        int r, q;
+
+        assert(x);
+        assert(y);
+
+        for (;;) {
+                char la[DNS_LABEL_MAX+1], lb[DNS_LABEL_MAX+1];
+
+                if (*x == 0 && *y == 0)
+                        return true;
+
+                r = dns_label_unescape(&x, la, sizeof(la));
+                if (r < 0)
+                        return r;
+
+                q = dns_label_unescape(&y, lb, sizeof(lb));
+                if (q < 0)
+                        return q;
+
+                la[r] = lb[q] = 0;
+                if (strcasecmp(la, lb))
+                        return false;
+        }
+}
+
+int dns_name_endswith(const char *name, const char *suffix) {
+        const char *n, *s, *saved_n = NULL;
+        int r, q;
+
+        assert(name);
+        assert(suffix);
+
+        n = name;
+        s = suffix;
+
+        for (;;) {
+                char ln[DNS_LABEL_MAX+1], ls[DNS_LABEL_MAX+1];
+
+                r = dns_label_unescape(&n, ln, sizeof(ln));
+                if (r < 0)
+                        return r;
+
+                if (!saved_n)
+                        saved_n = n;
+
+                q = dns_label_unescape(&s, ls, sizeof(ls));
+                if (r < 0)
+                        return r;
+
+                if (r == 0 && q == 0)
+                        return true;
+                if (r == 0 && saved_n == n)
+                        return false;
+
+                ln[r] = ls[q] = 0;
+
+                if (r != q || strcasecmp(ln, ls)) {
+
+                        /* Not the same, let's jump back, and try with the next label again */
+                        s = suffix;
+                        n = saved_n;
+                        saved_n = NULL;
+                }
+        }
+}
+
+int dns_name_reverse(int family, const union in_addr_union *a, char **ret) {
+        const uint8_t *p;
+        int r;
+
+        assert(a);
+        assert(ret);
+
+        p = (const uint8_t*) a;
+
+        if (family == AF_INET)
+                r = asprintf(ret, "%u.%u.%u.%u.in-addr.arpa", p[3], p[2], p[1], p[0]);
+        else if (family == AF_INET6)
+                r = asprintf(ret, "%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.ip6.arpa",
+                             hexchar(p[15]), hexchar(p[14]), hexchar(p[13]), hexchar(p[12]),
+                             hexchar(p[11]), hexchar(p[10]), hexchar(p[ 9]), hexchar(p[ 8]),
+                             hexchar(p[ 7]), hexchar(p[ 6]), hexchar(p[ 5]), hexchar(p[ 4]),
+                             hexchar(p[ 3]), hexchar(p[ 2]), hexchar(p[ 1]), hexchar(p[ 0]));
+        else
+                return -EAFNOSUPPORT;
+        if (r < 0)
+                return -ENOMEM;
+
+        return 0;
+}
+
+int dns_name_root(const char *name) {
+        char label[DNS_LABEL_MAX+1];
+        int r;
+
+        assert(name);
+
+        r = dns_label_unescape(&name, label, sizeof(label));
+        if (r < 0)
+                return r;
+
+        return r == 0 && *name == 0;
+}
+
+int dns_name_single_label(const char *name) {
+        char label[DNS_LABEL_MAX+1];
+        int r;
+
+        assert(name);
+
+        r = dns_label_unescape(&name, label, sizeof(label));
+        if (r < 0)
+                return r;
+
+        if (r == 0)
+                return 0;
+
+        r = dns_label_unescape(&name, label, sizeof(label));
+        if (r < 0)
+                return r;
+
+        return r == 0 && *name == 0;
+}
diff --git a/src/resolve/resolved-dns-domain.h b/src/resolve/resolved-dns-domain.h
new file mode 100644
index 0000000000..d6b4bdd083
--- /dev/null
+++ b/src/resolve/resolved-dns-domain.h
@@ -0,0 +1,43 @@
+/*-*- 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 <http://www.gnu.org/licenses/>.
+ ***/
+
+#include <sys/types.h>
+
+#include "hashmap.h"
+#include "in-addr-util.h"
+
+#define DNS_LABEL_MAX 63
+
+int dns_label_unescape(const char **name, char *dest, size_t sz);
+int dns_label_escape(const char *p, size_t l, char **ret);
+
+int dns_name_normalize(const char *s, char **_ret);
+
+unsigned long dns_name_hash_func(const void *s, const uint8_t hash_key[HASH_KEY_SIZE]);
+int dns_name_compare_func(const void *a, const void *b);
+
+int dns_name_equal(const char *x, const char *y);
+int dns_name_endswith(const char *name, const char *suffix);
+
+int dns_name_reverse(int family, const union in_addr_union *a, char **ret);
+
+int dns_name_root(const char *name);
+int dns_name_single_label(const char *name);
diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
new file mode 100644
index 0000000000..2a666924b0
--- /dev/null
+++ b/src/resolve/resolved-dns-packet.c
@@ -0,0 +1,734 @@
+/*-*- 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 <http://www.gnu.org/licenses/>.
+ ***/
+
+#include "utf8.h"
+
+#include "resolved-dns-domain.h"
+#include "resolved-dns-packet.h"
+
+int dns_packet_new(DnsPacket **ret, size_t mtu) {
+        DnsPacket *p;
+        size_t a;
+
+        assert(ret);
+
+        if (mtu <= 0)
+                a = DNS_PACKET_SIZE_START;
+        else
+                a = mtu;
+
+        if (a < DNS_PACKET_HEADER_SIZE)
+                a = DNS_PACKET_HEADER_SIZE;
+
+        p = malloc0(ALIGN(sizeof(DnsPacket)) + a);
+        if (!p)
+                return -ENOMEM;
+
+        p->size = p->rindex = DNS_PACKET_HEADER_SIZE;
+        p->allocated = a;
+        p->n_ref = 1;
+
+        *ret = p;
+
+        return 0;
+}
+
+int dns_packet_new_query(DnsPacket **ret, size_t mtu) {
+        DnsPacket *p;
+        DnsPacketHeader *h;
+        int r;
+
+        assert(ret);
+
+        r = dns_packet_new(&p, mtu);
+        if (r < 0)
+                return r;
+
+        h = DNS_PACKET_HEADER(p);
+        h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0, 0, 0, 0, 1, 0, 0, 0, 0));
+
+        *ret = p;
+        return 0;
+}
+
+DnsPacket *dns_packet_ref(DnsPacket *p) {
+
+        if (!p)
+                return NULL;
+
+        assert(p->n_ref > 0);
+        p->n_ref++;
+        return p;
+}
+
+static void dns_packet_free(DnsPacket *p) {
+        char *s;
+
+        assert(p);
+
+        while ((s = hashmap_steal_first_key(p->names)))
+                free(s);
+        hashmap_free(p->names);
+
+        free(p->data);
+        free(p);
+}
+
+DnsPacket *dns_packet_unref(DnsPacket *p) {
+        if (!p)
+                return NULL;
+
+        assert(p->n_ref > 0);
+
+        if (p->n_ref == 1)
+                dns_packet_free(p);
+        else
+                p->n_ref--;
+
+        return NULL;
+}
+
+int dns_packet_validate(DnsPacket *p) {
+        assert(p);
+
+        if (p->size < DNS_PACKET_HEADER_SIZE)
+                return -EBADMSG;
+
+        return 0;
+}
+
+int dns_packet_validate_reply(DnsPacket *p) {
+        DnsPacketHeader *h;
+        int r;
+
+        assert(p);
+
+        r = dns_packet_validate(p);
+        if (r < 0)
+                return r;
+
+        h = DNS_PACKET_HEADER(p);
+
+        /* Check QR field */
+        if ((be16toh(h->flags) & 1) == 0)
+                return -EBADMSG;
+
+        /* Check opcode field */
+        if (((be16toh(h->flags) >> 1) & 15) != 0)
+                return -EBADMSG;
+
+        return 0;
+}
+
+static int dns_packet_extend(DnsPacket *p, size_t add, void **ret, size_t *start) {
+        assert(p);
+
+        if (p->size + add > p->allocated)
+                return -ENOMEM;
+
+        if (start)
+                *start = p->size;
+
+        if (ret)
+                *ret = (uint8_t*) DNS_PACKET_DATA(p) + p->size;
+
+        p->size += add;
+        return 0;
+}
+
+static void dns_packet_truncate(DnsPacket *p, size_t sz) {
+        Iterator i;
+        char *s;
+        void *n;
+
+        assert(p);
+
+        if (p->size <= sz)
+                return;
+
+        HASHMAP_FOREACH_KEY(s, n, p->names, i) {
+
+                if (PTR_TO_SIZE(n) < sz)
+                        continue;
+
+                hashmap_remove(p->names, s);
+                free(s);
+        }
+
+        p->size = sz;
+}
+
+int dns_packet_append_uint8(DnsPacket *p, uint8_t v, size_t *start) {
+        void *d;
+        int r;
+
+        assert(p);
+
+        r = dns_packet_extend(p, sizeof(uint8_t), &d, start);
+        if (r < 0)
+                return r;
+
+        ((uint8_t*) d)[0] = v;
+
+        return 0;
+}
+
+int dns_packet_append_uint16(DnsPacket *p, uint16_t v, size_t *start) {
+        void *d;
+        int r;
+
+        assert(p);
+
+        r = dns_packet_extend(p, sizeof(uint16_t), &d, start);
+        if (r < 0)
+                return r;
+
+        ((uint8_t*) d)[0] = (uint8_t) (v >> 8);
+        ((uint8_t*) d)[1] = (uint8_t) (v & 255);
+
+        return 0;
+}
+
+int dns_packet_append_string(DnsPacket *p, const char *s, size_t *start) {
+        void *d;
+        size_t l;
+        int r;
+
+        assert(p);
+        assert(s);
+
+        l = strlen(s);
+        if (l > 255)
+                return -E2BIG;
+
+        r = dns_packet_extend(p, 1 + l, &d, start);
+        if (r < 0)
+                return r;
+
+        ((uint8_t*) d)[0] = (uint8_t) l;
+        memcpy(((uint8_t*) d) + 1, s, l);
+
+        return 0;
+}
+
+int dns_packet_append_label(DnsPacket *p, const char *d, size_t l, size_t *start) {
+        void *w;
+        int r;
+
+        assert(p);
+        assert(d);
+
+        if (l > DNS_LABEL_MAX)
+                return -E2BIG;
+
+        r = dns_packet_extend(p, 1 + l, &w, start);
+        if (r < 0)
+                return r;
+
+        ((uint8_t*) w)[0] = (uint8_t) l;
+        memcpy(((uint8_t*) w) + 1, d, l);
+
+        return 0;
+}
+
+int dns_packet_append_name(DnsPacket *p, const char *name, size_t *start) {
+        size_t saved_size;
+        int r;
+
+        assert(p);
+        assert(name);
+
+        saved_size = p->size;
+
+        while (*name) {
+                _cleanup_free_ char *s = NULL;
+                char label[DNS_LABEL_MAX];
+                size_t n;
+
+                n = PTR_TO_SIZE(hashmap_get(p->names, name));
+                if (n > 0) {
+                        assert(n < p->size);
+
+                        if (n < 0x4000) {
+                                r = dns_packet_append_uint16(p, 0xC000 | n, NULL);
+                                if (r < 0)
+                                        goto fail;
+
+                                goto done;
+                        }
+                }
+
+                s = strdup(name);
+                if (!s) {
+                        r = -ENOMEM;
+                        goto fail;
+                }
+
+                r = dns_label_unescape(&name, label, sizeof(label));
+                if (r < 0)
+                        goto fail;
+
+                r = dns_packet_append_label(p, label, r, &n);
+                if (r < 0)
+                        goto fail;
+
+                r = hashmap_ensure_allocated(&p->names, dns_name_hash_func, dns_name_compare_func);
+                if (r < 0)
+                        goto fail;
+
+                r = hashmap_put(p->names, s, SIZE_TO_PTR(n));
+                if (r < 0)
+                        goto fail;
+
+                s = NULL;
+        }
+
+        r = dns_packet_append_uint8(p, 0, NULL);
+        if (r < 0)
+                return r;
+
+done:
+        if (start)
+                *start = saved_size;
+
+        return 0;
+
+fail:
+        dns_packet_truncate(p, saved_size);
+        return r;
+}
+
+int dns_packet_append_key(DnsPacket *p, const DnsResourceKey *k, size_t *start) {
+        size_t saved_size;
+        int r;
+
+        assert(p);
+        assert(k);
+
+        saved_size = p->size;
+
+        r = dns_packet_append_name(p, k->name, NULL);
+        if (r < 0)
+                goto fail;
+
+        r = dns_packet_append_uint16(p, k->type, NULL);
+        if (r < 0)
+                goto fail;
+
+        r = dns_packet_append_uint16(p, k->class, NULL);
+        if (r < 0)
+                goto fail;
+
+        if (start)
+                *start = saved_size;
+
+        return 0;
+
+fail:
+        dns_packet_truncate(p, saved_size);
+        return r;
+}
+
+int dns_packet_read(DnsPacket *p, size_t sz, const void **ret, size_t *start) {
+        assert(p);
+
+        if (p->rindex + sz > p->size)
+                return -EMSGSIZE;
+
+        if (ret)
+                *ret = (uint8_t*) DNS_PACKET_DATA(p) + p->rindex;
+
+        if (start)
+                *start = p->rindex;
+
+        p->rindex += sz;
+        return 0;
+}
+
+static void dns_packet_rewind(DnsPacket *p, size_t idx) {
+        assert(p);
+        assert(idx <= p->size);
+        assert(idx >= DNS_PACKET_HEADER_SIZE);
+
+        p->rindex = idx;
+}
+
+int dns_packet_read_uint8(DnsPacket *p, uint8_t *ret, size_t *start) {
+        const void *d;
+        int r;
+
+        assert(p);
+
+        r = dns_packet_read(p, sizeof(uint8_t), &d, start);
+        if (r < 0)
+                return r;
+
+        *ret = ((uint8_t*) d)[0];
+        return 0;
+}
+
+int dns_packet_read_uint16(DnsPacket *p, uint16_t *ret, size_t *start) {
+        const void *d;
+        int r;
+
+        assert(p);
+
+        r = dns_packet_read(p, sizeof(uint16_t), &d, start);
+        if (r < 0)
+                return r;
+
+        *ret = (((uint16_t) ((uint8_t*) d)[0]) << 8) |
+                ((uint16_t) ((uint8_t*) d)[1]);
+        return 0;
+}
+
+int dns_packet_read_uint32(DnsPacket *p, uint32_t *ret, size_t *start) {
+        const void *d;
+        int r;
+
+        assert(p);
+
+        r = dns_packet_read(p, sizeof(uint32_t), &d, start);
+        if (r < 0)
+                return r;
+
+        *ret = (((uint32_t) ((uint8_t*) d)[0]) << 24) |
+               (((uint32_t) ((uint8_t*) d)[1]) << 16) |
+               (((uint32_t) ((uint8_t*) d)[2]) << 8) |
+                ((uint32_t) ((uint8_t*) d)[3]);
+
+        return 0;
+}
+
+int dns_packet_read_string(DnsPacket *p, char **ret, size_t *start) {
+        size_t saved_rindex;
+        const void *d;
+        char *t;
+        uint8_t c;
+        int r;
+
+        assert(p);
+
+        saved_rindex = p->rindex;
+
+        r = dns_packet_read_uint8(p, &c, NULL);
+        if (r < 0)
+                goto fail;
+
+        r = dns_packet_read(p, c, &d, NULL);
+        if (r < 0)
+                goto fail;
+
+        if (memchr(d, 0, c)) {
+                r = -EBADMSG;
+                goto fail;
+        }
+
+        t = strndup(d, c);
+        if (!t) {
+                r = -ENOMEM;
+                goto fail;
+        }
+
+        if (!utf8_is_valid(t)) {
+                free(t);
+                r = -EBADMSG;
+                goto fail;
+        }
+
+        *ret = t;
+
+        if (start)
+                *start = saved_rindex;
+
+        return 0;
+
+fail:
+        dns_packet_rewind(p, saved_rindex);
+        return r;
+}
+
+int dns_packet_read_name(DnsPacket *p, char **_ret, size_t *start) {
+        size_t saved_rindex, after_rindex = 0;
+        _cleanup_free_ char *ret = NULL;
+        size_t n = 0, allocated = 0;
+        bool first = true;
+        int r;
+
+        assert(p);
+        assert(_ret);
+
+        saved_rindex = p->rindex;
+
+        for (;;) {
+                uint8_t c, d;
+
+                r = dns_packet_read_uint8(p, &c, NULL);
+                if (r < 0)
+                        goto fail;
+
+                if (c == 0)
+                        /* End of name */
+                        break;
+                else if (c <= 63) {
+                        _cleanup_free_ char *t = NULL;
+                        const char *label;
+
+                        /* Literal label */
+                        r = dns_packet_read(p, c, (const void**) &label, NULL);
+                        if (r < 0)
+                                goto fail;
+
+                        r = dns_label_escape(label, c, &t);
+                        if (r < 0)
+                                goto fail;
+
+                        if (!GREEDY_REALLOC(ret, allocated, n + !first + strlen(t) + 1)) {
+                                r = -ENOMEM;
+                                goto fail;
+                        }
+
+                        if (!first)
+                                ret[n++] = '.';
+                        else
+                                first = false;
+
+                        memcpy(ret + n, t, c);
+                        n += r;
+                        continue;
+                } else if ((c & 0xc0) == 0xc0) {
+                        uint16_t ptr;
+
+                        /* Pointer */
+                        r = dns_packet_read_uint8(p, &d, NULL);
+                        if (r < 0)
+                                goto fail;
+
+                        ptr = (uint16_t) (c & ~0xc0) << 8 | (uint16_t) d;
+                        if (ptr < DNS_PACKET_HEADER_SIZE || ptr >= saved_rindex) {
+                                r = -EBADMSG;
+                                goto fail;
+                        }
+
+                        if (after_rindex == 0)
+                                after_rindex = p->rindex;
+
+                        p->rindex = ptr;
+                } else
+                        goto fail;
+        }
+
+        if (!GREEDY_REALLOC(ret, allocated, n + 1)) {
+                r = -ENOMEM;
+                goto fail;
+        }
+
+        ret[n] = 0;
+
+        if (after_rindex != 0)
+                p->rindex= after_rindex;
+
+        *_ret = ret;
+        ret = NULL;
+
+        if (start)
+                *start = saved_rindex;
+
+        return 0;
+
+fail:
+        dns_packet_rewind(p, saved_rindex);
+        return r;
+}
+
+int dns_packet_read_key(DnsPacket *p, DnsResourceKey *ret, size_t *start) {
+        _cleanup_(dns_resource_key_free) DnsResourceKey k = {};
+        size_t saved_rindex;
+        int r;
+
+        assert(p);
+        assert(ret);
+
+        saved_rindex = p->rindex;
+
+        r = dns_packet_read_name(p, &k.name, NULL);
+        if (r < 0)
+                goto fail;
+
+        r = dns_packet_read_uint16(p, &k.type, NULL);
+        if (r < 0)
+                goto fail;
+
+        r = dns_packet_read_uint16(p, &k.class, NULL);
+        if (r < 0)
+                goto fail;
+
+        *ret = k;
+        zero(k);
+
+        if (start)
+                *start = saved_rindex;
+
+        return 0;
+fail:
+        dns_packet_rewind(p, saved_rindex);
+        return r;
+}
+
+int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
+        _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
+        size_t saved_rindex, offset;
+        uint16_t rdlength;
+        const void *d;
+        int r;
+
+        assert(p);
+        assert(ret);
+
+        saved_rindex = p->rindex;
+
+        rr = dns_resource_record_new();
+        if (!rr)
+                goto fail;
+
+        r = dns_packet_read_key(p, &rr->key, NULL);
+        if (r < 0)
+                goto fail;
+
+        r = dns_packet_read_uint32(p, &rr->ttl, NULL);
+        if (r < 0)
+                goto fail;
+
+        r = dns_packet_read_uint16(p, &rdlength, NULL);
+        if (r < 0)
+                goto fail;
+
+        if (p->rindex + rdlength > p->size) {
+                r = -EBADMSG;
+                goto fail;
+        }
+
+        offset = p->rindex;
+
+        switch (rr->key.type) {
+
+        case DNS_TYPE_PTR:
+        case DNS_TYPE_NS:
+        case DNS_TYPE_CNAME:
+                r = dns_packet_read_name(p, &rr->ptr.name, NULL);
+                break;
+
+        case DNS_TYPE_HINFO:
+                r = dns_packet_read_string(p, &rr->hinfo.cpu, NULL);
+                if (r < 0)
+                        goto fail;
+
+                r = dns_packet_read_string(p, &rr->hinfo.os, NULL);
+                break;
+
+        case DNS_TYPE_A:
+                r = dns_packet_read(p, sizeof(struct in_addr), &d, NULL);
+                if (r < 0)
+                        goto fail;
+
+                memcpy(&rr->a.in_addr, d, sizeof(struct in_addr));
+                break;
+
+        case DNS_TYPE_AAAA:
+                r = dns_packet_read(p, sizeof(struct in6_addr), &d, NULL);
+                if (r < 0)
+                        goto fail;
+
+                memcpy(&rr->aaaa.in6_addr, d, sizeof(struct in6_addr));
+                break;
+
+        default:
+                r = dns_packet_read(p, rdlength, &d, NULL);
+                if (r < 0)
+                        goto fail;
+
+                rr->generic.data = memdup(d, rdlength);
+                if (!rr->generic.data) {
+                        r = -ENOMEM;
+                        goto fail;
+                }
+
+                rr->generic.size = rdlength;
+                break;
+        }
+        if (r < 0)
+                goto fail;
+        if (p->rindex != offset + rdlength) {
+                r = -EBADMSG;
+                goto fail;
+        }
+
+        *ret = rr;
+        rr = NULL;
+
+        if (start)
+                *start = saved_rindex;
+
+        return 0;
+fail:
+        dns_packet_rewind(p, saved_rindex);
+        return r;
+}
+
+int dns_packet_skip_question(DnsPacket *p) {
+        int r;
+
+        unsigned i, n;
+        assert(p);
+
+        n = be16toh(DNS_PACKET_HEADER(p)->qdcount);
+        for (i = 0; i < n; i++) {
+                _cleanup_(dns_resource_key_free) DnsResourceKey key = {};
+
+                r = dns_packet_read_key(p, &key, NULL);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}
+
+static const char* const dns_rcode_table[_DNS_RCODE_MAX_DEFINED] = {
+        [DNS_RCODE_SUCCESS] = "SUCCESS",
+        [DNS_RCODE_FORMERR] = "FORMERR",
+        [DNS_RCODE_SERVFAIL] = "SERVFAIL",
+        [DNS_RCODE_NXDOMAIN] = "NXDOMAIN",
+        [DNS_RCODE_NOTIMP] = "NOTIMP",
+        [DNS_RCODE_REFUSED] = "REFUSED",
+        [DNS_RCODE_YXDOMAIN] = "YXDOMAIN",
+        [DNS_RCODE_YXRRSET] = "YRRSET",
+        [DNS_RCODE_NXRRSET] = "NXRRSET",
+        [DNS_RCODE_NOTAUTH] = "NOTAUTH",
+        [DNS_RCODE_NOTZONE] = "NOTZONE",
+        [DNS_RCODE_BADVERS] = "BADVERS",
+        [DNS_RCODE_BADKEY] = "BADKEY",
+        [DNS_RCODE_BADTIME] = "BADTIME",
+        [DNS_RCODE_BADMODE] = "BADMODE",
+        [DNS_RCODE_BADNAME] = "BADNAME",
+        [DNS_RCODE_BADALG] = "BADALG",
+        [DNS_RCODE_BADTRUNC] = "BADTRUNC",
+};
+DEFINE_STRING_TABLE_LOOKUP(dns_rcode, int);
diff --git a/src/resolve/resolved-dns-packet.h b/src/resolve/resolved-dns-packet.h
new file mode 100644
index 0000000000..18ed4ba0d7
--- /dev/null
+++ b/src/resolve/resolved-dns-packet.h
@@ -0,0 +1,132 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  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 <http://www.gnu.org/licenses/>.
+ ***/
+
+typedef struct DnsPacketHeader DnsPacketHeader;
+typedef struct DnsPacket DnsPacket;
+
+#include <inttypes.h>
+
+#include "macro.h"
+#include "sparse-endian.h"
+#include "hashmap.h"
+#include "resolved-dns-rr.h"
+
+struct DnsPacketHeader {
+        uint16_t id;
+        be16_t flags;
+        be16_t qdcount;
+        be16_t ancount;
+        be16_t nscount;
+        be16_t arcount;
+};
+
+#define DNS_PACKET_HEADER_SIZE sizeof(DnsPacketHeader)
+#define DNS_PACKET_SIZE_START 512
+
+struct DnsPacket {
+        int n_ref;
+        size_t size, allocated, rindex;
+        Hashmap *names; /* For name compression */
+        void *data;
+        int ifindex;
+};
+
+static inline uint8_t* DNS_PACKET_DATA(DnsPacket *p) {
+        if (_unlikely_(!p))
+                return NULL;
+
+        if (p->data)
+                return p->data;
+
+        return ((uint8_t*) p) + ALIGN(sizeof(DnsPacket));
+}
+
+#define DNS_PACKET_HEADER(p) ((DnsPacketHeader*) DNS_PACKET_DATA(p))
+
+int dns_packet_new(DnsPacket **p, size_t mtu);
+int dns_packet_new_query(DnsPacket **p, size_t mtu);
+
+DnsPacket *dns_packet_ref(DnsPacket *p);
+DnsPacket *dns_packet_unref(DnsPacket *p);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(DnsPacket*, dns_packet_unref);
+
+int dns_packet_validate(DnsPacket *p);
+int dns_packet_validate_reply(DnsPacket *p);
+
+int dns_packet_append_uint8(DnsPacket *p, uint8_t v, size_t *start);
+int dns_packet_append_uint16(DnsPacket *p, uint16_t v, size_t *start);
+int dns_packet_append_string(DnsPacket *p, const char *s, size_t *start);
+int dns_packet_append_label(DnsPacket *p, const char *s, size_t l, size_t *start);
+int dns_packet_append_name(DnsPacket *p, const char *name, size_t *start);
+int dns_packet_append_key(DnsPacket *p, const DnsResourceKey *k, size_t *start);
+
+int dns_packet_read(DnsPacket *p, size_t sz, const void **ret, size_t *start);
+int dns_packet_read_uint8(DnsPacket *p, uint8_t *ret, size_t *start);
+int dns_packet_read_uint16(DnsPacket *p, uint16_t *ret, size_t *start);
+int dns_packet_read_uint32(DnsPacket *p, uint32_t *ret, size_t *start);
+int dns_packet_read_string(DnsPacket *p, char **ret, size_t *start);
+int dns_packet_read_name(DnsPacket *p, char **ret, size_t *start);
+int dns_packet_read_key(DnsPacket *p, DnsResourceKey *ret, size_t *start);
+int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start);
+
+int dns_packet_skip_question(DnsPacket *p);
+
+#define DNS_PACKET_MAKE_FLAGS(qr, opcode, aa, tc, rd, ra, ad, cd, rcode) \
+        (((uint16_t) !!qr << 15) |  \
+         ((uint16_t) (opcode & 15) << 11) | \
+         ((uint16_t) !!aa << 10) | \
+         ((uint16_t) !!tc << 9) | \
+         ((uint16_t) !!rd << 8) | \
+         ((uint16_t) !!ra << 7) | \
+         ((uint16_t) !!ad << 5) | \
+         ((uint16_t) !!cd << 4) | \
+         ((uint16_t) (rcode & 15)))
+
+#define DNS_PACKET_RCODE(p) (be16toh(DNS_PACKET_HEADER(p)->flags) & 15)
+
+enum {
+        DNS_RCODE_SUCCESS = 0,
+        DNS_RCODE_FORMERR = 1,
+        DNS_RCODE_SERVFAIL = 2,
+        DNS_RCODE_NXDOMAIN = 3,
+        DNS_RCODE_NOTIMP = 4,
+        DNS_RCODE_REFUSED = 5,
+        DNS_RCODE_YXDOMAIN = 6,
+        DNS_RCODE_YXRRSET = 7,
+        DNS_RCODE_NXRRSET = 8,
+        DNS_RCODE_NOTAUTH = 9,
+        DNS_RCODE_NOTZONE = 10,
+        DNS_RCODE_BADVERS = 16,
+        DNS_RCODE_BADSIG = 16, /* duplicate value! */
+        DNS_RCODE_BADKEY = 17,
+        DNS_RCODE_BADTIME = 18,
+        DNS_RCODE_BADMODE = 19,
+        DNS_RCODE_BADNAME = 20,
+        DNS_RCODE_BADALG = 21,
+        DNS_RCODE_BADTRUNC = 22,
+        _DNS_RCODE_MAX_DEFINED
+};
+
+const char* dns_rcode_to_string(int i) _const_;
+int dns_rcode_from_string(const char *s) _pure_;
diff --git a/src/resolve/resolved-dns-query.c b/src/resolve/resolved-dns-query.c
new file mode 100644
index 0000000000..a9880524e6
--- /dev/null
+++ b/src/resolve/resolved-dns-query.c
@@ -0,0 +1,408 @@
+/*-*- 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 <http://www.gnu.org/licenses/>.
+***/
+
+#include "resolved-dns-query.h"
+#include "resolved-dns-domain.h"
+
+#define TRANSACTION_TIMEOUT_USEC (5 * USEC_PER_SEC)
+#define QUERY_TIMEOUT_USEC (30 * USEC_PER_SEC)
+#define ATTEMPTS_MAX 8
+
+DnsQueryTransaction* dns_query_transaction_free(DnsQueryTransaction *t) {
+        if (!t)
+                return NULL;
+
+        sd_event_source_unref(t->timeout_event_source);
+        dns_packet_unref(t->packet);
+
+        if (t->query) {
+                LIST_REMOVE(transactions_by_query, t->query->transactions, t);
+                hashmap_remove(t->query->manager->dns_query_transactions, UINT_TO_PTR(t->id));
+        }
+
+        if (t->scope)
+                LIST_REMOVE(transactions_by_scope, t->scope->transactions, t);
+
+        free(t);
+        return NULL;
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQueryTransaction*, dns_query_transaction_free);
+
+static int dns_query_transaction_new(DnsQuery *q, DnsQueryTransaction **ret, DnsScope *s) {
+        _cleanup_(dns_query_transaction_freep) DnsQueryTransaction *t = NULL;
+        int r;
+
+        assert(q);
+        assert(s);
+
+        r = hashmap_ensure_allocated(&q->manager->dns_query_transactions, NULL, NULL);
+        if (r < 0)
+                return r;
+
+        t = new0(DnsQueryTransaction, 1);
+        if (!t)
+                return -ENOMEM;
+
+        do
+                random_bytes(&t->id, sizeof(t->id));
+        while (t->id == 0 ||
+               hashmap_get(q->manager->dns_query_transactions, UINT_TO_PTR(t->id)));
+
+        r = hashmap_put(q->manager->dns_query_transactions, UINT_TO_PTR(t->id), t);
+        if (r < 0) {
+                t->id = 0;
+                return r;
+        }
+
+        LIST_PREPEND(transactions_by_query, q->transactions, t);
+        t->query = q;
+
+        LIST_PREPEND(transactions_by_scope, s->transactions, t);
+        t->scope = s;
+
+        if (ret)
+                *ret = t;
+
+        t = NULL;
+
+        return 0;
+}
+
+static void dns_query_transaction_set_state(DnsQueryTransaction *t, DnsQueryState state) {
+        assert(t);
+
+        if (t->state == state)
+                return;
+
+        t->state = state;
+
+        if (state != DNS_QUERY_SENT)
+                t->timeout_event_source = sd_event_source_unref(t->timeout_event_source);
+
+        dns_query_finish(t->query);
+}
+
+int dns_query_transaction_reply(DnsQueryTransaction *t, DnsPacket *p) {
+        assert(t);
+        assert(p);
+
+        t->packet = dns_packet_ref(p);
+
+        if (DNS_PACKET_RCODE(p) == DNS_RCODE_SUCCESS) {
+                if( be16toh(DNS_PACKET_HEADER(p)->ancount) > 0)
+                        dns_query_transaction_set_state(t, DNS_QUERY_SUCCESS);
+                else
+                        dns_query_transaction_set_state(t, DNS_QUERY_INVALID_REPLY);
+        } else
+                dns_query_transaction_set_state(t, DNS_QUERY_FAILURE);
+
+        return 0;
+}
+
+static int on_transaction_timeout(sd_event_source *s, usec_t usec, void *userdata) {
+        DnsQueryTransaction *t = userdata;
+        int r;
+
+        assert(s);
+        assert(t);
+
+        /* Timeout reached? Try again, with a new server */
+        dns_scope_next_dns_server(t->scope);
+
+        r = dns_query_transaction_start(t);
+        if (r < 0)
+                dns_query_transaction_set_state(t, DNS_QUERY_FAILURE);
+
+        return 0;
+}
+
+int dns_query_transaction_start(DnsQueryTransaction *t) {
+        _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
+        unsigned n;
+        int r;
+
+        assert(t);
+
+        t->timeout_event_source = sd_event_source_unref(t->timeout_event_source);
+
+        if (t->n_attempts >= ATTEMPTS_MAX) {
+                dns_query_transaction_set_state(t, DNS_QUERY_ATTEMPTS_MAX);
+                return 0;
+        }
+
+        t->n_attempts++;
+
+        r = dns_packet_new_query(&p, 0);
+        if (r < 0)
+                return r;
+
+        for (n = 0; n < t->query->n_keys; n++) {
+                r = dns_packet_append_key(p, &t->query->keys[n], NULL);
+                if (r < 0)
+                        return r;
+        }
+
+        DNS_PACKET_HEADER(p)->qdcount = htobe16(t->query->n_keys);
+        DNS_PACKET_HEADER(p)->id = t->id;
+
+        r = dns_scope_send(t->scope, p);
+        if (r < 0) {
+                /* Couldn't send? Try immediately again, with a new server */
+                dns_scope_next_dns_server(t->scope);
+
+                return dns_query_transaction_start(t);
+        }
+
+        if (r > 0) {
+                int q;
+
+                q = sd_event_add_time(t->query->manager->event, &t->timeout_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + TRANSACTION_TIMEOUT_USEC, 0, on_transaction_timeout, t);
+                if (q < 0)
+                        return q;
+
+                dns_query_transaction_set_state(t, DNS_QUERY_SENT);
+        } else
+                dns_query_transaction_set_state(t, DNS_QUERY_SKIPPED);
+
+        return r;
+}
+
+DnsQuery *dns_query_free(DnsQuery *q) {
+        unsigned n;
+
+        if (!q)
+                return NULL;
+
+        sd_bus_message_unref(q->request);
+        dns_packet_unref(q->packet);
+        sd_event_source_unref(q->timeout_event_source);
+
+        while (q->transactions)
+                dns_query_transaction_free(q->transactions);
+
+        if (q->manager)
+                LIST_REMOVE(queries, q->manager->dns_queries, q);
+
+        for (n = 0; n < q->n_keys; n++)
+                free(q->keys[n].name);
+        free(q->keys);
+        free(q);
+
+        return NULL;
+}
+
+int dns_query_new(Manager *m, DnsQuery **ret, DnsResourceKey *keys, unsigned n_keys) {
+        _cleanup_(dns_query_freep) DnsQuery *q = NULL;
+        DnsScope *s, *first = NULL;
+        DnsScopeMatch found = DNS_SCOPE_NO;
+        const char *name = NULL;
+        int n, r;
+
+        assert(m);
+
+        if (n_keys <= 0 || n_keys >= 65535)
+                return -EINVAL;
+
+        assert(keys);
+
+        q = new0(DnsQuery, 1);
+        if (!q)
+                return -ENOMEM;
+
+        q->keys = new(DnsResourceKey, n_keys);
+        if (!q->keys)
+                return -ENOMEM;
+
+        for (q->n_keys = 0; q->n_keys < n_keys; q->n_keys++) {
+                q->keys[q->n_keys].class = keys[q->n_keys].class;
+                q->keys[q->n_keys].type = keys[q->n_keys].type;
+                q->keys[q->n_keys].name = strdup(keys[q->n_keys].name);
+                if (!q->keys[q->n_keys].name)
+                        return -ENOMEM;
+
+                if (!name)
+                        name = q->keys[q->n_keys].name;
+                else if (!dns_name_equal(name, q->keys[q->n_keys].name))
+                        return -EINVAL;
+        }
+
+        LIST_PREPEND(queries, m->dns_queries, q);
+        q->manager = m;
+
+        LIST_FOREACH(scopes, s, m->dns_scopes) {
+                DnsScopeMatch match;
+
+                match = dns_scope_test(s, name);
+                if (match < 0)
+                        return match;
+
+                if (match == DNS_SCOPE_NO)
+                        continue;
+
+                found = match;
+
+                if (match == DNS_SCOPE_YES) {
+                        first = s;
+                        break;
+                } else {
+                        assert(match == DNS_SCOPE_MAYBE);
+
+                        if (!first)
+                                first = s;
+                }
+        }
+
+        if (found == DNS_SCOPE_NO)
+                return -ENETDOWN;
+
+        r = dns_query_transaction_new(q, NULL, first);
+        if (r < 0)
+                return r;
+
+        n = 1;
+        LIST_FOREACH(scopes, s, first->scopes_next) {
+                DnsScopeMatch match;
+
+                match = dns_scope_test(s, name);
+                if (match < 0)
+                        return match;
+
+                if (match != found)
+                        continue;
+
+                r = dns_query_transaction_new(q, NULL, s);
+                if (r < 0)
+                        return r;
+
+                n++;
+        }
+
+        if (ret)
+                *ret = q;
+        q = NULL;
+
+        return n;
+}
+
+static void dns_query_set_state(DnsQuery *q, DnsQueryState state) {
+        assert(q);
+
+        if (q->state == state)
+                return;
+
+        q->state = state;
+
+        if (state == DNS_QUERY_SENT)
+                return;
+
+        q->timeout_event_source = sd_event_source_unref(q->timeout_event_source);
+
+        while (q->transactions)
+                dns_query_transaction_free(q->transactions);
+
+        if (q->complete)
+                q->complete(q);
+}
+
+static int on_query_timeout(sd_event_source *s, usec_t usec, void *userdata) {
+        DnsQuery *q = userdata;
+
+        assert(s);
+        assert(q);
+
+        dns_query_set_state(q, DNS_QUERY_TIMEOUT);
+        return 0;
+}
+
+int dns_query_start(DnsQuery *q) {
+        DnsQueryTransaction *t;
+        int r;
+
+        assert(q);
+        assert(q->state == DNS_QUERY_NULL);
+
+        if (!q->transactions)
+                return -ENETDOWN;
+
+        r = sd_event_add_time(q->manager->event, &q->timeout_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + QUERY_TIMEOUT_USEC, 0, on_query_timeout, q);
+        if (r < 0)
+                goto fail;
+
+        dns_query_set_state(q, DNS_QUERY_SENT);
+
+        LIST_FOREACH(transactions_by_query, t, q->transactions) {
+
+                r = dns_query_transaction_start(t);
+                if (r < 0)
+                        goto fail;
+
+                if (q->state != DNS_QUERY_SENT)
+                        break;
+        }
+
+        return 0;
+
+fail:
+        while (q->transactions)
+                dns_query_transaction_free(q->transactions);
+
+        return r;
+}
+
+void dns_query_finish(DnsQuery *q) {
+        DnsQueryTransaction *t;
+        DnsQueryState state = DNS_QUERY_SKIPPED;
+        uint16_t rcode = 0;
+
+        assert(q);
+
+        if (q->state != DNS_QUERY_SENT)
+                return;
+
+        LIST_FOREACH(transactions_by_query, t, q->transactions) {
+
+                /* One of the transactions is still going on, let's wait for it */
+                if (t->state == DNS_QUERY_SENT || t->state == DNS_QUERY_NULL)
+                        return;
+
+                /* One of the transactions is sucecssful, let's use it */
+                if (t->state == DNS_QUERY_SUCCESS) {
+                        q->packet = dns_packet_ref(t->packet);
+                        dns_query_set_state(q, DNS_QUERY_SUCCESS);
+                        return;
+                }
+
+                if (t->state == DNS_QUERY_FAILURE) {
+                        state = DNS_QUERY_FAILURE;
+
+                        if (rcode == 0 && t->packet)
+                                rcode = DNS_PACKET_RCODE(t->packet);
+
+                } else if (state == DNS_QUERY_SKIPPED && t->state != DNS_QUERY_SKIPPED)
+                        state = t->state;
+        }
+
+        if (state == DNS_QUERY_FAILURE)
+                q->rcode = rcode;
+
+        dns_query_set_state(q, state);
+}
diff --git a/src/resolve/resolved-dns-query.h b/src/resolve/resolved-dns-query.h
new file mode 100644
index 0000000000..a07f174706
--- /dev/null
+++ b/src/resolve/resolved-dns-query.h
@@ -0,0 +1,97 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  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 <http://www.gnu.org/licenses/>.
+***/
+
+#include <inttypes.h>
+
+#include "sd-bus.h"
+#include "util.h"
+
+typedef struct DnsQuery DnsQuery;
+typedef struct DnsQueryTransaction DnsQueryTransaction;
+
+#include "resolved.h"
+#include "resolved-dns-scope.h"
+#include "resolved-dns-rr.h"
+#include "resolved-dns-packet.h"
+
+typedef enum DnsQueryState {
+        DNS_QUERY_NULL,
+        DNS_QUERY_SENT,
+        DNS_QUERY_FAILURE,
+        DNS_QUERY_SUCCESS,
+        DNS_QUERY_SKIPPED,
+        DNS_QUERY_TIMEOUT,
+        DNS_QUERY_ATTEMPTS_MAX,
+        DNS_QUERY_INVALID_REPLY,
+} DnsQueryState;
+
+struct DnsQueryTransaction {
+        DnsQuery *query;
+        DnsScope *scope;
+
+        DnsQueryState state;
+        uint16_t id;
+
+        sd_event_source *timeout_event_source;
+        unsigned n_attempts;
+
+        DnsPacket *packet;
+
+        LIST_FIELDS(DnsQueryTransaction, transactions_by_query);
+        LIST_FIELDS(DnsQueryTransaction, transactions_by_scope);
+};
+
+struct DnsQuery {
+        Manager *manager;
+
+        DnsResourceKey *keys;
+        unsigned n_keys;
+
+        DnsQueryState state;
+
+        sd_event_source *timeout_event_source;
+
+        uint16_t rcode;
+        DnsPacket *packet;
+
+        sd_bus_message *request;
+        unsigned char request_family;
+        const char *request_hostname;
+        union in_addr_union request_address;
+
+        void (*complete)(DnsQuery* q);
+
+        LIST_HEAD(DnsQueryTransaction, transactions);
+        LIST_FIELDS(DnsQuery, queries);
+};
+
+int dns_query_new(Manager *m, DnsQuery **q, DnsResourceKey *keys, unsigned n_keys);
+DnsQuery *dns_query_free(DnsQuery *q);
+int dns_query_start(DnsQuery *q);
+void dns_query_finish(DnsQuery *q);
+
+DnsQueryTransaction* dns_query_transaction_free(DnsQueryTransaction *t);
+int dns_query_transaction_start(DnsQueryTransaction *t);
+int dns_query_transaction_reply(DnsQueryTransaction *t, DnsPacket *p);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQuery*, dns_query_free);
diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c
new file mode 100644
index 0000000000..cb555cb4ef
--- /dev/null
+++ b/src/resolve/resolved-dns-rr.c
@@ -0,0 +1,76 @@
+/*-*- 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 <http://www.gnu.org/licenses/>.
+***/
+
+#include "resolved-dns-rr.h"
+
+void dns_resource_key_free(DnsResourceKey *key) {
+        if (!key)
+                return;
+
+        free(key->name);
+        zero(*key);
+}
+
+DnsResourceRecord* dns_resource_record_new(void) {
+        DnsResourceRecord *rr;
+
+        rr = new0(DnsResourceRecord, 1);
+        if (!rr)
+                return NULL;
+
+        rr->n_ref = 1;
+        return rr;
+}
+
+DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr) {
+        if (!rr)
+                return NULL;
+
+        assert(rr->n_ref > 0);
+        rr->n_ref++;
+
+        return rr;
+}
+
+DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) {
+        if (!rr)
+                return NULL;
+
+        assert(rr->n_ref > 0);
+
+        if (rr->n_ref > 1) {
+                rr->n_ref--;
+                return NULL;
+        }
+
+        if (IN_SET(rr->key.type, DNS_TYPE_PTR, DNS_TYPE_NS, DNS_TYPE_CNAME))
+                free(rr->ptr.name);
+        else if (rr->key.type == DNS_TYPE_HINFO) {
+                free(rr->hinfo.cpu);
+                free(rr->hinfo.os);
+        } else if (!IN_SET(rr->key.type, DNS_TYPE_A, DNS_TYPE_AAAA))
+                free(rr->generic.data);
+
+        dns_resource_key_free(&rr->key);
+        free(rr);
+
+        return NULL;
+}
diff --git a/src/resolve/resolved-dns-rr.h b/src/resolve/resolved-dns-rr.h
new file mode 100644
index 0000000000..144fffa3e0
--- /dev/null
+++ b/src/resolve/resolved-dns-rr.h
@@ -0,0 +1,114 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  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 <http://www.gnu.org/licenses/>.
+ ***/
+
+#include <inttypes.h>
+#include <netinet/in.h>
+
+#include "util.h"
+
+typedef struct DnsResourceKey DnsResourceKey;
+typedef struct DnsResourceRecord DnsResourceRecord;
+
+/* DNS record classes, see RFC 1035 */
+enum {
+        DNS_CLASS_IN   = 0x01,
+};
+
+/* DNS record types, see RFC 1035 */
+enum {
+        /* Normal records */
+        DNS_TYPE_A     = 0x01,
+        DNS_TYPE_NS    = 0x02,
+        DNS_TYPE_CNAME = 0x05,
+        DNS_TYPE_SOA   = 0x06,
+        DNS_TYPE_PTR   = 0x0C,
+        DNS_TYPE_HINFO = 0x0D,
+        DNS_TYPE_MX    = 0x0F,
+        DNS_TYPE_TXT   = 0x10,
+        DNS_TYPE_AAAA  = 0x1C,
+        DNS_TYPE_SRV   = 0x21,
+
+        /* Special records */
+        DNS_TYPE_ANY   = 0xFF,
+        DNS_TYPE_OPT   = 0x29,      /* EDNS0 option */
+        DNS_TYPE_TKEY  = 0xF9,
+        DNS_TYPE_TSIG  = 0xFA,
+        DNS_TYPE_IXFR  = 0xFB,
+        DNS_TYPE_AXFR  = 0xFC,
+};
+
+struct DnsResourceKey {
+        uint16_t class;
+        uint16_t type;
+        char *name;
+};
+
+struct DnsResourceRecord {
+        unsigned n_ref;
+
+        DnsResourceKey key;
+        uint32_t ttl;
+
+        union {
+                struct {
+                        void *data;
+                        uint16_t size;
+                } generic;
+
+                /* struct { */
+                /*         uint16_t priority; */
+                /*         uint16_t weight; */
+                /*         uint16_t port; */
+                /*         char *name; */
+                /* } srv; */
+
+                struct {
+                        char *name;
+                } ptr, ns, cname;
+
+                struct {
+                        char *cpu;
+                        char *os;
+                } hinfo;
+
+                /* struct { */
+                /*         char **list; */
+                /* } txt; */
+
+                struct {
+                        struct in_addr in_addr;
+                } a;
+
+                struct {
+                        struct in6_addr in6_addr;
+                } aaaa;
+        };
+};
+
+void dns_resource_key_free(DnsResourceKey *key);
+
+DnsResourceRecord* dns_resource_record_new(void);
+DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr);
+DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);
diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c
new file mode 100644
index 0000000000..4e0a742768
--- /dev/null
+++ b/src/resolve/resolved-dns-scope.c
@@ -0,0 +1,147 @@
+/*-*- 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 <http://www.gnu.org/licenses/>.
+***/
+
+#include "strv.h"
+#include "resolved-dns-domain.h"
+#include "resolved-dns-scope.h"
+
+#define SEND_TIMEOUT_USEC (2*USEC_PER_SEC)
+
+int dns_scope_new(Manager *m, DnsScope **ret, DnsScopeType t) {
+        DnsScope *s;
+
+        assert(m);
+        assert(ret);
+
+        s = new0(DnsScope, 1);
+        if (!s)
+                return -ENOMEM;
+
+        s->manager = m;
+        s->type = t;
+
+        LIST_PREPEND(scopes, m->dns_scopes, s);
+
+        *ret = s;
+        return 0;
+}
+
+DnsScope* dns_scope_free(DnsScope *s) {
+        if (!s)
+                return NULL;
+
+        while (s->transactions) {
+                DnsQuery *q;
+
+                q = s->transactions->query;
+                dns_query_transaction_free(s->transactions);
+
+                dns_query_finish(q);
+        }
+
+        LIST_REMOVE(scopes, s->manager->dns_scopes, s);
+        strv_free(s->domains);
+        free(s);
+
+        return NULL;
+}
+
+DnsServer *dns_scope_get_server(DnsScope *s) {
+        assert(s);
+
+        if (s->link)
+                return link_get_dns_server(s->link);
+        else
+                return manager_get_dns_server(s->manager);
+}
+
+void dns_scope_next_dns_server(DnsScope *s) {
+        assert(s);
+
+        if (s->link)
+                link_next_dns_server(s->link);
+        else
+                manager_next_dns_server(s->manager);
+}
+
+int dns_scope_send(DnsScope *s, DnsPacket *p) {
+        int ifindex = 0;
+        DnsServer *srv;
+        int r;
+
+        assert(s);
+        assert(p);
+
+        srv = dns_scope_get_server(s);
+        if (!srv)
+                return 0;
+
+        if (s->link)
+                ifindex = s->link->ifindex;
+
+        if (srv->family == AF_INET)
+                r = manager_dns_ipv4_send(s->manager, srv, ifindex, p);
+        else if (srv->family == AF_INET6)
+                r = manager_dns_ipv6_send(s->manager, srv, ifindex, p);
+        else
+                return -EAFNOSUPPORT;
+
+        if (r < 0)
+                return r;
+
+        return 1;
+}
+
+DnsScopeMatch dns_scope_test(DnsScope *s, const char *domain) {
+        char **i;
+
+        assert(s);
+        assert(domain);
+
+        STRV_FOREACH(i, s->domains)
+                if (dns_name_endswith(domain, *i))
+                        return DNS_SCOPE_YES;
+
+        if (dns_name_root(domain))
+                return DNS_SCOPE_NO;
+
+        if (s->type == DNS_SCOPE_MDNS) {
+                if (dns_name_endswith(domain, "254.169.in-addr.arpa") ||
+                    dns_name_endswith(domain, "0.8.e.f.ip6.arpa"))
+                        return DNS_SCOPE_YES;
+                else if (dns_name_endswith(domain, "local") ||
+                         !dns_name_single_label(domain))
+                        return DNS_SCOPE_MAYBE;
+
+                return DNS_SCOPE_NO;
+        }
+
+        if (s->type == DNS_SCOPE_DNS) {
+                if (dns_name_endswith(domain, "254.169.in-addr.arpa") ||
+                    dns_name_endswith(domain, "0.8.e.f.ip6.arpa") ||
+                    dns_name_single_label(domain))
+                        return DNS_SCOPE_NO;
+
+                return DNS_SCOPE_MAYBE;
+        }
+
+        assert_not_reached("Unknown scope type");
+}
diff --git a/src/resolve/resolved-dns-scope.h b/src/resolve/resolved-dns-scope.h
new file mode 100644
index 0000000000..50f1106bf1
--- /dev/null
+++ b/src/resolve/resolved-dns-scope.h
@@ -0,0 +1,69 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  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 <http://www.gnu.org/licenses/>.
+***/
+
+#include "list.h"
+
+typedef struct DnsScope DnsScope;
+
+#include "resolved.h"
+#include "resolved-link.h"
+#include "resolved-dns-server.h"
+#include "resolved-dns-packet.h"
+#include "resolved-dns-query.h"
+
+typedef enum DnsScopeType {
+        DNS_SCOPE_DNS,
+        DNS_SCOPE_MDNS,
+} DnsScopeType;
+
+typedef enum DnsScopeMatch {
+        DNS_SCOPE_NO,
+        DNS_SCOPE_MAYBE,
+        DNS_SCOPE_YES,
+        _DNS_SCOPE_MATCH_MAX,
+        _DNS_SCOPE_INVALID = -1
+} DnsScopeMatch;
+
+struct DnsScope {
+        Manager *manager;
+
+        DnsScopeType type;
+        unsigned char family;
+
+        Link *link;
+
+        char **domains;
+
+        LIST_HEAD(DnsQueryTransaction, transactions);
+
+        LIST_FIELDS(DnsScope, scopes);
+};
+
+int dns_scope_new(Manager *m, DnsScope **ret, DnsScopeType t);
+DnsScope* dns_scope_free(DnsScope *s);
+
+int dns_scope_send(DnsScope *s, DnsPacket *p);
+DnsScopeMatch dns_scope_test(DnsScope *s, const char *domain);
+
+DnsServer *dns_scope_get_server(DnsScope *s);
+void dns_scope_next_dns_server(DnsScope *s);
diff --git a/src/resolve/resolved-dns-server.c b/src/resolve/resolved-dns-server.c
new file mode 100644
index 0000000000..4e0220b7d8
--- /dev/null
+++ b/src/resolve/resolved-dns-server.c
@@ -0,0 +1,98 @@
+/*-*- 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 <http://www.gnu.org/licenses/>.
+***/
+
+#include "resolved-dns-server.h"
+
+int dns_server_new(
+                Manager *m,
+                DnsServer **ret,
+                DnsServerSource source,
+                Link *l,
+                unsigned char family,
+                union in_addr_union *in_addr) {
+
+        DnsServer *s, *tail;
+
+        assert(m);
+        assert(in_addr);
+        assert(source < _DNS_SERVER_SOURCE_MAX);
+
+        s = new0(DnsServer, 1);
+        if (!s)
+                return -ENOMEM;
+
+        s->source = source;
+        s->family = family;
+        s->address = *in_addr;
+
+        if (source == DNS_SERVER_LINK) {
+                assert(l);
+                LIST_FIND_TAIL(servers, l->link_dns_servers, tail);
+                LIST_INSERT_AFTER(servers, l->link_dns_servers, tail, s);
+                s->link = l;
+        } else if (source == DNS_SERVER_DHCP) {
+                assert(l);
+                LIST_FIND_TAIL(servers, l->dhcp_dns_servers, tail);
+                LIST_INSERT_AFTER(servers, l->dhcp_dns_servers, tail, s);
+                s->link = l;
+        } else {
+                assert(!l);
+                LIST_FIND_TAIL(servers, m->dns_servers, tail);
+                LIST_INSERT_AFTER(servers, m->dns_servers, tail, s);
+        }
+
+        s->manager = m;
+
+        if (ret)
+                *ret = s;
+
+        return 0;
+}
+
+DnsServer* dns_server_free(DnsServer *s)  {
+        if (!s)
+                return NULL;
+
+        if (s->source == DNS_SERVER_LINK) {
+
+                if (s->link)
+                        LIST_REMOVE(servers, s->link->link_dns_servers, s);
+        } else if (s->source == DNS_SERVER_DHCP) {
+
+                if (s->link)
+                        LIST_REMOVE(servers, s->link->dhcp_dns_servers, s);
+
+        } else if (s->source == DNS_SERVER_SYSTEM) {
+
+                if (s->manager)
+                        LIST_REMOVE(servers, s->manager->dns_servers, s);
+        }
+
+        if (s->link && s->link->current_dns_server == s)
+                s->link->current_dns_server = NULL;
+
+        if (s->manager && s->manager->current_dns_server == s)
+                s->manager->current_dns_server = NULL;
+
+        free(s);
+
+        return NULL;
+}
diff --git a/src/resolve/resolved-dns-server.h b/src/resolve/resolved-dns-server.h
new file mode 100644
index 0000000000..adceb868a3
--- /dev/null
+++ b/src/resolve/resolved-dns-server.h
@@ -0,0 +1,61 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  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 <http://www.gnu.org/licenses/>.
+***/
+
+typedef struct DnsServer DnsServer;
+typedef enum DnsServerSource DnsServerSource;
+
+#include "in-addr-util.h"
+#include "resolved.h"
+#include "resolved-link.h"
+#include "resolved-dns-server.h"
+
+enum DnsServerSource {
+        DNS_SERVER_SYSTEM,
+        DNS_SERVER_LINK,
+        DNS_SERVER_DHCP,
+        _DNS_SERVER_SOURCE_MAX
+};
+
+struct DnsServer {
+        Manager *manager;
+        DnsServerSource source;
+
+        unsigned char family;
+        union in_addr_union address;
+
+        bool marked;
+
+        Link *link;
+
+        LIST_FIELDS(DnsServer, servers);
+};
+
+int dns_server_new(
+                Manager *m,
+                DnsServer **s,
+                DnsServerSource source,
+                Link *l,
+                unsigned char family,
+                union in_addr_union *in_addr);
+
+DnsServer* dns_server_free(DnsServer *s);
diff --git a/src/resolve/resolved-gperf.gperf b/src/resolve/resolved-gperf.gperf
index 71e998051a..051ccec708 100644
--- a/src/resolve/resolved-gperf.gperf
+++ b/src/resolve/resolved-gperf.gperf
@@ -14,4 +14,4 @@ struct ConfigPerfItem;
 %struct-type
 %includes
 %%
-Resolve.DNS,                    config_parse_dnsv,     0, offsetof(Manager, fallback_dns)
+Resolve.DNS,                    config_parse_dnsv,     0, 0
diff --git a/src/resolve/resolved-link.c b/src/resolve/resolved-link.c
new file mode 100644
index 0000000000..27477de7b5
--- /dev/null
+++ b/src/resolve/resolved-link.c
@@ -0,0 +1,378 @@
+/*-*- 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 <http://www.gnu.org/licenses/>.
+***/
+
+#include <net/if.h>
+
+#include "sd-network.h"
+#include "dhcp-lease-internal.h"
+#include "strv.h"
+#include "resolved-link.h"
+
+int link_new(Manager *m, Link **ret, int ifindex) {
+        _cleanup_(link_freep) Link *l = NULL;
+        int r;
+
+        assert(m);
+        assert(ifindex > 0);
+
+        r = hashmap_ensure_allocated(&m->links, NULL, NULL);
+        if (r < 0)
+                return r;
+
+        l = new0(Link, 1);
+        if (!l)
+                return -ENOMEM;
+
+        l->ifindex = ifindex;
+
+        r = hashmap_put(m->links, INT_TO_PTR(ifindex), l);
+        if (r < 0)
+                return r;
+
+        l->manager = m;
+
+        if (ret)
+                *ret = l;
+        l = NULL;
+
+        return 0;
+}
+
+Link *link_free(Link *l) {
+
+        if (!l)
+                return NULL;
+
+        while (l->addresses)
+                link_address_free(l->addresses);
+
+        if (l->manager)
+                hashmap_remove(l->manager->links, INT_TO_PTR(l->ifindex));
+
+        dns_scope_free(l->unicast_scope);
+        dns_scope_free(l->mdns_ipv4_scope);
+        dns_scope_free(l->mdns_ipv6_scope);
+
+        while (l->dhcp_dns_servers)
+                dns_server_free(l->dhcp_dns_servers);
+
+        while (l->link_dns_servers)
+                dns_server_free(l->link_dns_servers);
+
+        free(l);
+        return NULL;
+ }
+
+int link_update_rtnl(Link *l, sd_rtnl_message *m) {
+        int r;
+
+        assert(l);
+        assert(m);
+
+        r = sd_rtnl_message_link_get_flags(m, &l->flags);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+static int update_dhcp_dns_servers(Link *l) {
+        _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
+        _cleanup_free_ struct in_addr *nameservers = NULL;
+        DnsServer *s, *nx;
+        unsigned i;
+        size_t n;
+        int r;
+
+        assert(l);
+
+        r = sd_network_dhcp_use_dns(l->ifindex);
+        if (r <= 0)
+                goto clear;
+
+        r = sd_network_get_dhcp_lease(l->ifindex, &lease);
+        if (r < 0)
+                goto clear;
+
+        LIST_FOREACH(servers, s, l->dhcp_dns_servers)
+                s->marked = true;
+
+        r = sd_dhcp_lease_get_dns(lease, &nameservers, &n);
+        if (r < 0)
+                goto clear;
+
+        for (i = 0; i < n; i++) {
+                union in_addr_union a = { .in = nameservers[i] };
+
+                s = link_find_dns_server(l, DNS_SERVER_DHCP, AF_INET, &a);
+                if (s)
+                        s->marked = false;
+                else {
+                        r = dns_server_new(l->manager, NULL, DNS_SERVER_DHCP, l, AF_INET, &a);
+                        if (r < 0)
+                                goto clear;
+                }
+        }
+
+        LIST_FOREACH_SAFE(servers, s, nx, l->dhcp_dns_servers)
+                if (s->marked)
+                        dns_server_free(s);
+
+        return 0;
+
+clear:
+        while (l->dhcp_dns_servers)
+                dns_server_free(l->dhcp_dns_servers);
+
+        return r;
+}
+
+static int update_link_dns_servers(Link *l) {
+        _cleanup_free_ struct in_addr *nameservers = NULL;
+        _cleanup_free_ struct in6_addr *nameservers6 = NULL;
+        DnsServer *s, *nx;
+        unsigned i;
+        size_t n;
+        int r;
+
+        assert(l);
+
+        LIST_FOREACH(servers, s, l->link_dns_servers)
+                s->marked = true;
+
+        r = sd_network_get_dns(l->ifindex, &nameservers, &n);
+        if (r < 0)
+                goto clear;
+
+        for (i = 0; i < n; i++) {
+                union in_addr_union a = { .in = nameservers[i] };
+
+                s = link_find_dns_server(l, DNS_SERVER_LINK, AF_INET, &a);
+                if (s)
+                        s->marked = false;
+                else {
+                        r = dns_server_new(l->manager, NULL, DNS_SERVER_LINK, l, AF_INET, &a);
+                        if (r < 0)
+                                goto clear;
+                }
+        }
+
+        r = sd_network_get_dns6(l->ifindex, &nameservers6, &n);
+        if (r < 0)
+                goto clear;
+
+        for (i = 0; i < n; i++) {
+                union in_addr_union a = { .in6 = nameservers6[i] };
+
+                s = link_find_dns_server(l, DNS_SERVER_LINK, AF_INET6, &a);
+                if (s)
+                        s->marked = false;
+                else {
+                        r = dns_server_new(l->manager, NULL, DNS_SERVER_LINK, l, AF_INET6, &a);
+                        if (r < 0)
+                                goto clear;
+                }
+        }
+
+        LIST_FOREACH_SAFE(servers, s, nx, l->link_dns_servers)
+                if (s->marked)
+                        dns_server_free(s);
+
+        return 0;
+
+clear:
+        while (l->link_dns_servers)
+                dns_server_free(l->link_dns_servers);
+
+        return r;
+}
+
+int link_update_monitor(Link *l) {
+        assert(l);
+
+        free(l->operational_state);
+        l->operational_state = NULL;
+
+        sd_network_get_link_operational_state(l->ifindex, &l->operational_state);
+
+        update_dhcp_dns_servers(l);
+        update_link_dns_servers(l);
+
+        return 0;
+}
+
+bool link_relevant(Link *l) {
+        LinkAddress *a;
+
+        assert(l);
+
+        /* A link is relevant if it isn't a loopback device and has at
+         * least one relevant IP address */
+
+        if (l->flags & IFF_LOOPBACK)
+                return false;
+
+        if (l->operational_state && !STR_IN_SET(l->operational_state, "unknown", "degraded", "routable"))
+                return false;
+
+        LIST_FOREACH(addresses, a, l->addresses)
+                if (link_address_relevant(a))
+                        return true;
+
+        return false;
+}
+
+LinkAddress *link_find_address(Link *l, unsigned char family, union in_addr_union *in_addr) {
+        LinkAddress *a;
+
+        assert(l);
+
+        LIST_FOREACH(addresses, a, l->addresses) {
+
+                if (a->family == family &&
+                    in_addr_equal(family, &a->in_addr, in_addr))
+                        return a;
+        }
+
+        return NULL;
+}
+
+DnsServer* link_find_dns_server(Link *l, DnsServerSource source, unsigned char family, union in_addr_union *in_addr) {
+        DnsServer *first, *s;
+
+        assert(l);
+
+        first = source == DNS_SERVER_DHCP ? l->dhcp_dns_servers : l->link_dns_servers;
+
+        LIST_FOREACH(servers, s, first) {
+
+                if (s->family == family &&
+                    in_addr_equal(family, &s->address, in_addr))
+                        return s;
+        }
+
+        return NULL;
+}
+
+DnsServer *link_get_dns_server(Link *l) {
+        assert(l);
+
+        if (!l->current_dns_server)
+                l->current_dns_server = l->link_dns_servers;
+        if (!l->current_dns_server)
+                l->current_dns_server = l->dhcp_dns_servers;
+
+        return l->current_dns_server;
+}
+
+void link_next_dns_server(Link *l) {
+        assert(l);
+
+        /* Switch to the next DNS server */
+
+        if (!l->current_dns_server) {
+                l->current_dns_server = l->link_dns_servers;
+                if (l->current_dns_server)
+                        return;
+        }
+
+        if (!l->current_dns_server) {
+                l->current_dns_server = l->dhcp_dns_servers;
+                if (l->current_dns_server)
+                        return;
+        }
+
+        if (!l->current_dns_server)
+                return;
+
+        if (l->current_dns_server->servers_next) {
+                l->current_dns_server = l->current_dns_server->servers_next;
+                return;
+        }
+
+        if (l->current_dns_server->source == DNS_SERVER_LINK)
+                l->current_dns_server = l->dhcp_dns_servers;
+        else {
+                assert(l->current_dns_server->source == DNS_SERVER_DHCP);
+                l->current_dns_server = l->link_dns_servers;
+        }
+}
+
+int link_address_new(Link *l, LinkAddress **ret, unsigned char family, union in_addr_union *in_addr) {
+        LinkAddress *a;
+
+        assert(l);
+        assert(in_addr);
+
+        a = new0(LinkAddress, 1);
+        if (!a)
+                return -ENOMEM;
+
+        a->family = family;
+        a->in_addr = *in_addr;
+
+        a->link = l;
+        LIST_PREPEND(addresses, l->addresses, a);
+
+        if (ret)
+                *ret = a;
+
+        return 0;
+}
+
+LinkAddress *link_address_free(LinkAddress *a) {
+        if (!a)
+                return NULL;
+
+        if (a->link)
+                LIST_REMOVE(addresses, a->link->addresses, a);
+
+        free(a);
+        return NULL;
+}
+
+int link_address_update_rtnl(LinkAddress *a, sd_rtnl_message *m) {
+        int r;
+        assert(a);
+        assert(m);
+
+        r = sd_rtnl_message_addr_get_flags(m, &a->flags);
+        if (r < 0)
+                return r;
+
+        r = sd_rtnl_message_addr_get_scope(m, &a->scope);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+bool link_address_relevant(LinkAddress *a) {
+        assert(a);
+
+        if (a->flags & IFA_F_DEPRECATED)
+                return false;
+
+        if (IN_SET(a->scope, RT_SCOPE_HOST, RT_SCOPE_NOWHERE))
+                return false;
+
+        return true;
+}
diff --git a/src/resolve/resolved-link.h b/src/resolve/resolved-link.h
new file mode 100644
index 0000000000..07f68ab41c
--- /dev/null
+++ b/src/resolve/resolved-link.h
@@ -0,0 +1,84 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  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 <http://www.gnu.org/licenses/>.
+***/
+
+#include "in-addr-util.h"
+#include "ratelimit.h"
+
+typedef struct Link Link;
+typedef struct LinkAddress LinkAddress;
+
+#include "resolved.h"
+#include "resolved-dns-server.h"
+#include "resolved-dns-scope.h"
+
+struct LinkAddress {
+        Link *link;
+
+        unsigned char family;
+        union in_addr_union in_addr;
+
+        unsigned char flags, scope;
+
+        LIST_FIELDS(LinkAddress, addresses);
+};
+
+struct Link {
+        Manager *manager;
+
+        int ifindex;
+        unsigned flags;
+
+        LIST_HEAD(LinkAddress, addresses);
+
+        LIST_HEAD(DnsServer, link_dns_servers);
+        LIST_HEAD(DnsServer, dhcp_dns_servers);
+        DnsServer *current_dns_server;
+
+        DnsScope *unicast_scope;
+        DnsScope *mdns_ipv4_scope;
+        DnsScope *mdns_ipv6_scope;
+
+        size_t mtu;
+
+        char *operational_state;
+
+        RateLimit mdns_ratelimit;
+};
+
+int link_new(Manager *m, Link **ret, int ifindex);
+Link *link_free(Link *l);
+int link_update_rtnl(Link *l, sd_rtnl_message *m);
+int link_update_monitor(Link *l);
+bool link_relevant(Link *l);
+LinkAddress* link_find_address(Link *l, unsigned char family, union in_addr_union *in_addr);
+
+DnsServer* link_find_dns_server(Link *l, DnsServerSource source, unsigned char family, union in_addr_union *in_addr);
+DnsServer* link_get_dns_server(Link *l);
+void link_next_dns_server(Link *l);
+
+int link_address_new(Link *l, LinkAddress **ret, unsigned char family, union in_addr_union *in_addr);
+LinkAddress *link_address_free(LinkAddress *a);
+int link_address_update_rtnl(LinkAddress *a, sd_rtnl_message *m);
+bool link_address_relevant(LinkAddress *l);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_free);
diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c
index b4f4d07147..dc6deeb7e5 100644
--- a/src/resolve/resolved-manager.c
+++ b/src/resolve/resolved-manager.c
@@ -22,16 +22,286 @@
 #include <arpa/inet.h>
 #include <resolv.h>
 #include <linux/if.h>
+#include <sys/ioctl.h>
+#include <sys/poll.h>
+#include <netinet/in.h>
 
-#include "resolved.h"
+#include "rtnl-util.h"
 #include "event-util.h"
 #include "network-util.h"
 #include "sd-dhcp-lease.h"
 #include "dhcp-lease-internal.h"
 #include "network-internal.h"
 #include "conf-parser.h"
+#include "socket-util.h"
+#include "resolved.h"
+
+#define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
+
+static int manager_process_link(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) {
+        Manager *m = userdata;
+        uint16_t type;
+        Link *l;
+        int ifindex, r;
+
+        assert(rtnl);
+        assert(m);
+        assert(mm);
+
+        r = sd_rtnl_message_get_type(mm, &type);
+        if (r < 0)
+                goto fail;
+
+        r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
+        if (r < 0)
+                goto fail;
+
+        l = hashmap_get(m->links, INT_TO_PTR(ifindex));
+
+        switch (type) {
+
+        case RTM_NEWLINK:
+                if (!l) {
+                        log_debug("Found link %i", ifindex);
+
+                        r = link_new(m, &l, ifindex);
+                        if (r < 0)
+                                goto fail;
+                }
+
+                r = link_update_rtnl(l, mm);
+                if (r < 0)
+                        goto fail;
+
+                break;
+
+        case RTM_DELLINK:
+                if (l) {
+                        log_debug("Removing link %i", l->ifindex);
+                        link_free(l);
+                }
+
+                break;
+        }
+
+        return 0;
+
+fail:
+        log_warning("Failed to process RTNL link message: %s", strerror(-r));
+        return 0;
+}
+
+static int manager_process_address(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) {
+        Manager *m = userdata;
+        union in_addr_union address;
+        unsigned char family;
+        uint16_t type;
+        int r, ifindex;
+        LinkAddress *a;
+        Link *l;
+
+        assert(rtnl);
+        assert(mm);
+        assert(m);
+
+        r = sd_rtnl_message_get_type(mm, &type);
+        if (r < 0)
+                goto fail;
+
+        r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex);
+        if (r < 0)
+                goto fail;
+
+        l = hashmap_get(m->links, INT_TO_PTR(ifindex));
+        if (!l)
+                return 0;
+
+        r = sd_rtnl_message_addr_get_family(mm, &family);
+        if (r < 0)
+                goto fail;
+
+        switch (family) {
+
+        case AF_INET:
+                r = sd_rtnl_message_read_in_addr(mm, IFA_LOCAL, &address.in);
+                if (r < 0) {
+                        r = sd_rtnl_message_read_in_addr(mm, IFA_ADDRESS, &address.in);
+                        if (r < 0)
+                                goto fail;
+                }
+
+                break;
+
+        case AF_INET6:
+                r = sd_rtnl_message_read_in6_addr(mm, IFA_LOCAL, &address.in6);
+                if (r < 0) {
+                        r = sd_rtnl_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6);
+                        if (r < 0)
+                                goto fail;
+                }
+
+                break;
+
+        default:
+                return 0;
+        }
+
+        a = link_find_address(l, family, &address);
+
+        switch (type) {
+
+        case RTM_NEWADDR:
+
+                if (!a) {
+                        r = link_address_new(l, &a, family, &address);
+                        if (r < 0)
+                                return r;
+                }
+
+                r = link_address_update_rtnl(a, mm);
+                if (r < 0)
+                        return r;
+
+                break;
+
+        case RTM_DELADDR:
+                if (a)
+                        link_address_free(a);
+                break;
+        }
+
+        return 0;
+
+fail:
+        log_warning("Failed to process RTNL address message: %s", strerror(-r));
+        return 0;
+}
+
+
+static int manager_rtnl_listen(Manager *m) {
+        _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
+        sd_rtnl_message *i;
+        int r;
+
+        assert(m);
+
+        /* First, subscibe to interfaces coming and going */
+        r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR);
+        if (r < 0)
+                return r;
+
+        r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
+        if (r < 0)
+                return r;
+
+        r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m);
+        if (r < 0)
+                return r;
+
+        r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m);
+        if (r < 0)
+                return r;
+
+        r = sd_rtnl_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m);
+        if (r < 0)
+                return r;
 
-static int set_fallback_dns(Manager *m, const char *string) {
+        r = sd_rtnl_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m);
+        if (r < 0)
+                return r;
+
+        /* Then, enumerate all links */
+        r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
+        if (r < 0)
+                return r;
+
+        r = sd_rtnl_message_request_dump(req, true);
+        if (r < 0)
+                return r;
+
+        r = sd_rtnl_call(m->rtnl, req, 0, &reply);
+        if (r < 0)
+                return r;
+
+        for (i = reply; i; i = sd_rtnl_message_next(i)) {
+                r = manager_process_link(m->rtnl, i, m);
+                if (r < 0)
+                        return r;
+        }
+
+        req = sd_rtnl_message_unref(req);
+        reply = sd_rtnl_message_unref(reply);
+
+        /* Finally, enumerate all addresses, too */
+        r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
+        if (r < 0)
+                return r;
+
+        r = sd_rtnl_message_request_dump(req, true);
+        if (r < 0)
+                return r;
+
+        r = sd_rtnl_call(m->rtnl, req, 0, &reply);
+        if (r < 0)
+                return r;
+
+        for (i = reply; i; i = sd_rtnl_message_next(i)) {
+                r = manager_process_address(m->rtnl, i, m);
+                if (r < 0)
+                        return r;
+        }
+
+        return r;
+}
+
+static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+        Manager *m = userdata;
+        Iterator i;
+        Link *l;
+        int r;
+
+        assert(m);
+
+        sd_network_monitor_flush(m->network_monitor);
+
+        HASHMAP_FOREACH(l, m->links, i) {
+                r = link_update_monitor(l);
+                if (r < 0)
+                        log_warning("Failed to update monitor information for %i: %s", l->ifindex, strerror(-r));
+        }
+
+        r = manager_write_resolv_conf(m);
+        if (r < 0)
+                log_warning("Could not update resolv.conf: %s", strerror(-r));
+
+        return 0;
+}
+
+static int manager_network_monitor_listen(Manager *m) {
+        int r, fd, events;
+
+        assert(m);
+
+        r = sd_network_monitor_new(NULL, &m->network_monitor);
+        if (r < 0)
+                return r;
+
+        fd = sd_network_monitor_get_fd(m->network_monitor);
+        if (fd < 0)
+                return fd;
+
+        events = sd_network_monitor_get_events(m->network_monitor);
+        if (events < 0)
+                return events;
+
+        r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+static int parse_dns_server_string(Manager *m, const char *string) {
         char *word, *state;
         size_t length;
         int r;
@@ -40,27 +310,26 @@ static int set_fallback_dns(Manager *m, const char *string) {
         assert(string);
 
         FOREACH_WORD_QUOTED(word, length, string, state) {
-                _cleanup_free_ Address *address = NULL;
-                Address *tail;
-                _cleanup_free_ char *addrstr = NULL;
-
-                address = new0(Address, 1);
-                if (!address)
-                        return -ENOMEM;
+                char buffer[length+1];
+                unsigned family;
+                union in_addr_union addr;
 
-                addrstr = strndup(word, length);
-                if (!addrstr)
-                        return -ENOMEM;
+                memcpy(buffer, word, length);
+                buffer[length] = 0;
 
-                r = net_parse_inaddr(addrstr, &address->family, &address->in_addr);
+                r = in_addr_from_string_auto(buffer, &family, &addr);
                 if (r < 0) {
-                        log_debug("Ignoring invalid DNS address '%s'", addrstr);
+                        log_warning("Ignoring invalid DNS address '%s'", buffer);
                         continue;
                 }
 
-                LIST_FIND_TAIL(addresses, m->fallback_dns, tail);
-                LIST_INSERT_AFTER(addresses, m->fallback_dns, tail, address);
-                address = NULL;
+                /* filter out duplicates */
+                if (manager_find_dns_server(m, family, &addr))
+                        continue;
+
+                r = dns_server_new(m, NULL, DNS_SERVER_SYSTEM, NULL, family, &addr);
+                if (r < 0)
+                        return r;
         }
 
         return 0;
@@ -79,39 +348,48 @@ int config_parse_dnsv(
                 void *userdata) {
 
         Manager *m = userdata;
-        Address *address;
+        int r;
 
         assert(filename);
         assert(lvalue);
         assert(rvalue);
         assert(m);
 
-        while ((address = m->fallback_dns)) {
-                LIST_REMOVE(addresses, m->fallback_dns, address);
-                free(address);
+        /* Empty assignment means clear the list */
+        if (isempty(rvalue)) {
+                while (m->dns_servers)
+                        dns_server_free(m->dns_servers);
+
+                return 0;
         }
 
-        set_fallback_dns(m, rvalue);
+        r = parse_dns_server_string(m, rvalue);
+        if (r < 0) {
+                log_error("Failed to parse DNS server string");
+                return r;
+        }
 
         return 0;
 }
 
-static int manager_parse_config_file(Manager *m) {
+int manager_parse_config_file(Manager *m) {
         int r;
 
         assert(m);
 
-        r = config_parse(NULL, "/etc/systemd/resolved.conf", NULL,
-                         "Resolve\0", config_item_perf_lookup, (void*) resolved_gperf_lookup,
+        r = config_parse(NULL,
+                         "/etc/systemd/resolved.conf", NULL,
+                         "Resolve\0",
+                         config_item_perf_lookup, (void*) resolved_gperf_lookup,
                          false, false, m);
         if (r < 0)
                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 
-        return r;
+        return 0;
 }
 
 int manager_new(Manager **ret) {
-        _cleanup_manager_free_ Manager *m = NULL;
+        _cleanup_(manager_freep) Manager *m = NULL;
         int r;
 
         assert(ret);
@@ -120,11 +398,9 @@ int manager_new(Manager **ret) {
         if (!m)
                 return -ENOMEM;
 
-        r = set_fallback_dns(m, DNS_SERVERS);
-        if (r < 0)
-                return r;
+        m->dns_ipv4_fd = m->dns_ipv6_fd = -1;
 
-        r = manager_parse_config_file(m);
+        r = parse_dns_server_string(m, /* "172.31.0.125 2001:4860:4860::8888 2001:4860:4860::8889" */ DNS_SERVERS);
         if (r < 0)
                 return r;
 
@@ -137,61 +413,96 @@ int manager_new(Manager **ret) {
 
         sd_event_set_watchdog(m->event, true);
 
+        r = dns_scope_new(m, &m->unicast_scope, DNS_SCOPE_DNS);
+        if (r < 0)
+                return r;
+
+        r = manager_network_monitor_listen(m);
+        if (r < 0)
+                return r;
+
+        r = manager_rtnl_listen(m);
+        if (r < 0)
+                return r;
+
+        r = manager_connect_bus(m);
+        if (r < 0)
+                return r;
+
         *ret = m;
         m = NULL;
 
         return 0;
 }
 
-void manager_free(Manager *m) {
-        Address *address;
+Manager *manager_free(Manager *m) {
+        Link *l;
 
         if (!m)
-                return;
+                return NULL;
+
+        while (m->dns_queries)
+                dns_query_free(m->dns_queries);
+
+        hashmap_free(m->dns_query_transactions);
+
+        while ((l = hashmap_first(m->links)))
+               link_free(l);
+        hashmap_free(m->links);
+
+        dns_scope_free(m->unicast_scope);
+
+        while (m->dns_servers)
+                dns_server_free(m->dns_servers);
 
         sd_event_source_unref(m->network_event_source);
         sd_network_monitor_unref(m->network_monitor);
-        sd_event_unref(m->event);
 
-        while ((address = m->fallback_dns)) {
-                LIST_REMOVE(addresses, m->fallback_dns, address);
-                free(address);
-        }
+        sd_event_source_unref(m->dns_ipv4_event_source);
+        sd_event_source_unref(m->dns_ipv6_event_source);
+
+        safe_close(m->dns_ipv4_fd);
+        safe_close(m->dns_ipv6_fd);
+
+        sd_event_source_unref(m->bus_retry_event_source);
+        sd_bus_unref(m->bus);
 
+        sd_event_unref(m->event);
         free(m);
+
+        return NULL;
 }
 
-static void append_dns(FILE *f, void *dns, unsigned char family, unsigned *count) {
-        char buf[INET6_ADDRSTRLEN];
-        const char *address;
+static void write_resolve_conf_server(DnsServer *s, FILE *f, unsigned *count) {
+        _cleanup_free_ char *t  = NULL;
+        int r;
 
+        assert(s);
         assert(f);
-        assert(dns);
         assert(count);
 
-        address = inet_ntop(family, dns, buf, INET6_ADDRSTRLEN);
-        if (!address) {
+        r = in_addr_to_string(s->family, &s->address, &t);
+        if (r < 0) {
                 log_warning("Invalid DNS address. Ignoring.");
                 return;
         }
 
         if (*count == MAXNS)
-                fputs("# Too many DNS servers configured, the following entries "
-                      "may be ignored\n", f);
-
-        fprintf(f, "nameserver %s\n", address);
+                fputs("# Too many DNS servers configured, the following entries may be ignored\n", f);
 
+        fprintf(f, "nameserver %s\n", t);
         (*count) ++;
 }
 
-int manager_update_resolv_conf(Manager *m) {
+int manager_write_resolv_conf(Manager *m) {
         const char *path = "/run/systemd/resolve/resolv.conf";
         _cleanup_free_ char *temp_path = NULL;
         _cleanup_fclose_ FILE *f = NULL;
-         _cleanup_free_ unsigned *indices = NULL;
-        Address *address;
         unsigned count = 0;
-        int n, r, i;
+        DnsServer *s;
+        Iterator i;
+        Link *l;
+        int r;
 
         assert(m);
 
@@ -207,108 +518,368 @@ int manager_update_resolv_conf(Manager *m) {
               "# resolv.conf(5) in a different way, replace the symlink by a\n"
               "# static file or a different symlink.\n\n", f);
 
-        n = sd_network_get_ifindices(&indices);
-        if (n < 0)
-                n = 0;
-
-        for (i = 0; i < n; i++) {
-                _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
-                struct in_addr *nameservers;
-                struct in6_addr *nameservers6;
-                size_t nameservers_size;
-
-                r = sd_network_dhcp_use_dns(indices[i]);
-                if (r > 0) {
-                        r = sd_network_get_dhcp_lease(indices[i], &lease);
-                        if (r >= 0) {
-                                r = sd_dhcp_lease_get_dns(lease, &nameservers, &nameservers_size);
-                                if (r >= 0) {
-                                        unsigned j;
-
-                                        for (j = 0; j < nameservers_size; j++)
-                                                append_dns(f, &nameservers[j], AF_INET, &count);
-                                }
-                        }
-                }
+        HASHMAP_FOREACH(l, m->links, i) {
+                LIST_FOREACH(servers, s, l->link_dns_servers)
+                        write_resolve_conf_server(s, f, &count);
 
-                r = sd_network_get_dns(indices[i], &nameservers, &nameservers_size);
-                if (r >= 0) {
-                        unsigned j;
+                LIST_FOREACH(servers, s, l->dhcp_dns_servers)
+                        write_resolve_conf_server(s, f, &count);
+        }
 
-                        for (j = 0; j < nameservers_size; j++)
-                                append_dns(f, &nameservers[j], AF_INET, &count);
+        LIST_FOREACH(servers, s, m->dns_servers)
+                write_resolve_conf_server(s, f, &count);
 
-                        free(nameservers);
-                }
+        r = fflush_and_check(f);
+        if (r < 0)
+                goto fail;
+
+        if (rename(temp_path, path) < 0) {
+                r = -errno;
+                goto fail;
+        }
 
-                r = sd_network_get_dns6(indices[i], &nameservers6, &nameservers_size);
-                if (r >= 0) {
-                        unsigned j;
+        return 0;
 
-                        for (j = 0; j < nameservers_size; j++)
-                                append_dns(f, &nameservers6[j], AF_INET6, &count);
+fail:
+        unlink(path);
+        unlink(temp_path);
+        return r;
+}
 
-                        free(nameservers6);
-                }
+int manager_dns_ipv4_recv(Manager *m, DnsPacket **ret) {
+        _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
+        struct msghdr mh = {};
+        int fd, ms = 0, r;
+        struct iovec iov;
+        ssize_t l;
+
+        assert(m);
+        assert(ret);
+
+        fd = manager_dns_ipv4_fd(m);
+        if (fd < 0)
+                return fd;
+
+        r = ioctl(fd, FIONREAD, &ms);
+        if (r < 0)
+                return -errno;
+        if (ms < 0)
+                return -EIO;
+
+        r = dns_packet_new(&p, ms);
+        if (r < 0)
+                return r;
+
+        iov.iov_base = DNS_PACKET_DATA(p);
+        iov.iov_len = p->allocated;
+
+        mh.msg_iov = &iov;
+        mh.msg_iovlen = 1;
+
+        l = recvmsg(fd, &mh, 0);
+        if (l < 0) {
+                if (errno == EAGAIN)
+                        return 0;
+
+                return -errno;
         }
 
-        LIST_FOREACH(addresses, address, m->fallback_dns)
-                append_dns(f, &address->in_addr, address->family, &count);
+        if (l <= 0)
+                return -EIO;
 
-        fflush(f);
+        p->size = (size_t) l;
 
-        if (ferror(f) || rename(temp_path, path) < 0) {
-                r = -errno;
-                unlink(path);
-                unlink(temp_path);
+        *ret = p;
+        p = NULL;
+
+        return 1;
+}
+
+int manager_dns_ipv6_recv(Manager *m, DnsPacket **ret) {
+        _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
+        struct msghdr mh = {};
+        struct iovec iov;
+        int fd, ms = 0, r;
+        ssize_t l;
+
+        assert(m);
+        assert(ret);
+
+        fd = manager_dns_ipv6_fd(m);
+        if (fd < 0)
+                return fd;
+
+        r = ioctl(fd, FIONREAD, &ms);
+        if (r < 0)
+                return -errno;
+        if (ms < 0)
+                return -EIO;
+
+        r = dns_packet_new(&p, ms);
+        if (r < 0)
                 return r;
+
+        iov.iov_base = DNS_PACKET_DATA(p);
+        iov.iov_len = p->allocated;
+
+        mh.msg_iov = &iov;
+        mh.msg_iovlen = 1;
+
+        l = recvmsg(fd, &mh, 0);
+        if (l < 0) {
+                if (errno == EAGAIN)
+                        return 0;
+
+                return -errno;
         }
 
-        return 0;
+        if (l <= 0)
+                return -EIO;
+
+        p->size = (size_t) l;
+
+        *ret = p;
+        p = NULL;
+
+        return 1;
+}
+
+static int on_dns_ipv4_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+        _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
+        DnsQueryTransaction *t = NULL;
+        Manager *m = userdata;
+        int r;
+
+        r = manager_dns_ipv4_recv(m, &p);
+        if (r <= 0)
+                return r;
+
+        t = hashmap_get(m->dns_query_transactions, UINT_TO_PTR(DNS_PACKET_HEADER(p)->id));
+        if (!t)
+                return 0;
+
+        return dns_query_transaction_reply(t, p);
 }
 
-static int manager_network_event_handler(sd_event_source *s, int fd, uint32_t revents,
-                                         void *userdata) {
+static int on_dns_ipv6_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+        _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
+        DnsQueryTransaction *t = NULL;
         Manager *m = userdata;
         int r;
 
+        r = manager_dns_ipv6_recv(m, &p);
+        if (r <= 0)
+                return r;
+
+        t = hashmap_get(m->dns_query_transactions, UINT_TO_PTR(DNS_PACKET_HEADER(p)->id));
+        if (!t)
+                return 0;
+
+        return dns_query_transaction_reply(t, p);
+}
+
+int manager_dns_ipv4_fd(Manager *m) {
+        int r;
+
         assert(m);
 
-        r = manager_update_resolv_conf(m);
-        if (r < 0)
-                log_warning("Could not update resolv.conf: %s", strerror(-r));
+        if (m->dns_ipv4_fd >= 0)
+                return m->dns_ipv4_fd;
 
-        sd_network_monitor_flush(m->network_monitor);
+        m->dns_ipv4_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+        if (m->dns_ipv4_fd < 0)
+                return -errno;
 
-        return 0;
+        r = sd_event_add_io(m->event, &m->dns_ipv4_event_source, m->dns_ipv4_fd, EPOLLIN, on_dns_ipv4_packet, m);
+        if (r < 0)
+                return r;
+
+        return m->dns_ipv4_fd;
 }
 
-int manager_network_monitor_listen(Manager *m) {
-        _cleanup_event_source_unref_ sd_event_source *event_source = NULL;
-        _cleanup_network_monitor_unref_ sd_network_monitor *monitor = NULL;
-        int r, fd, events;
+int manager_dns_ipv6_fd(Manager *m) {
+        int r;
+
+        assert(m);
 
-        r = sd_network_monitor_new(NULL, &monitor);
+        if (m->dns_ipv6_fd >= 0)
+                return m->dns_ipv6_fd;
+
+        m->dns_ipv6_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+        if (m->dns_ipv6_fd < 0)
+                return -errno;
+
+        r = sd_event_add_io(m->event, &m->dns_ipv6_event_source, m->dns_ipv6_fd, EPOLLIN, on_dns_ipv6_packet, m);
         if (r < 0)
                 return r;
 
-        fd = sd_network_monitor_get_fd(monitor);
+        return m->dns_ipv6_fd;
+}
+
+static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
+        int r;
+
+        assert(fd >= 0);
+        assert(mh);
+
+        for (;;) {
+                if (sendmsg(fd, mh, flags) >= 0)
+                        return 0;
+
+                if (errno == EINTR)
+                        continue;
+
+                if (errno != EAGAIN)
+                        return -errno;
+
+                r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
+                if (r < 0)
+                        return r;
+                if (r == 0)
+                        return -ETIMEDOUT;
+        }
+}
+
+int manager_dns_ipv4_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p) {
+        union sockaddr_union sa = {
+                .in.sin_family = AF_INET,
+                .in.sin_port = htobe16(53),
+        };
+        struct msghdr mh = {};
+        struct iovec iov;
+        uint8_t control[CMSG_SPACE(sizeof(struct in_pktinfo))];
+        int fd;
+
+        assert(m);
+        assert(srv);
+        assert(p);
+
+        fd = manager_dns_ipv4_fd(m);
         if (fd < 0)
                 return fd;
 
-        events = sd_network_monitor_get_events(monitor);
-        if (events < 0)
-                return events;
+        iov.iov_base = DNS_PACKET_DATA(p);
+        iov.iov_len = p->size;
 
-        r = sd_event_add_io(m->event, &event_source, fd, events,
-                            &manager_network_event_handler, m);
-        if (r < 0)
-                return r;
+        sa.in.sin_addr = srv->address.in;
 
-        m->network_monitor = monitor;
-        m->network_event_source = event_source;
-        monitor = NULL;
-        event_source = NULL;
+        mh.msg_iov = &iov;
+        mh.msg_iovlen = 1;
+        mh.msg_name = &sa.sa;
+        mh.msg_namelen = sizeof(sa.in);
 
-        return 0;
+        if (ifindex > 0) {
+                struct cmsghdr *cmsg;
+                struct in_pktinfo *pi;
+
+                zero(control);
+
+                mh.msg_control = control;
+                mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo));
+
+                cmsg = CMSG_FIRSTHDR(&mh);
+                cmsg->cmsg_len = mh.msg_controllen;
+                cmsg->cmsg_level = IPPROTO_IP;
+                cmsg->cmsg_type = IP_PKTINFO;
+
+                pi = (struct in_pktinfo*) CMSG_DATA(cmsg);
+                pi->ipi_ifindex = ifindex;
+        }
+
+        return sendmsg_loop(fd, &mh, 0);
+}
+
+int manager_dns_ipv6_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p) {
+        union sockaddr_union sa = {
+                .in6.sin6_family = AF_INET6,
+                .in6.sin6_port = htobe16(53),
+        };
+
+        struct msghdr mh = {};
+        struct iovec iov;
+        uint8_t control[CMSG_SPACE(sizeof(struct in6_pktinfo))];
+        int fd;
+
+        assert(m);
+        assert(srv);
+        assert(p);
+
+        fd = manager_dns_ipv6_fd(m);
+        if (fd < 0)
+                return fd;
+
+        iov.iov_base = DNS_PACKET_DATA(p);
+        iov.iov_len = p->size;
+
+        sa.in6.sin6_addr = srv->address.in6;
+        sa.in6.sin6_scope_id = ifindex;
+
+        mh.msg_iov = &iov;
+        mh.msg_iovlen = 1;
+        mh.msg_name = &sa.sa;
+        mh.msg_namelen = sizeof(sa.in6);
+
+        if (ifindex > 0) {
+                struct cmsghdr *cmsg;
+                struct in6_pktinfo *pi;
+
+                zero(control);
+
+                mh.msg_control = control;
+                mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo));
+
+                cmsg = CMSG_FIRSTHDR(&mh);
+                cmsg->cmsg_len = mh.msg_controllen;
+                cmsg->cmsg_level = IPPROTO_IPV6;
+                cmsg->cmsg_type = IPV6_PKTINFO;
+
+                pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);
+                pi->ipi6_ifindex = ifindex;
+        }
+
+        return sendmsg_loop(fd, &mh, 0);
+}
+
+DnsServer* manager_find_dns_server(Manager *m, unsigned char family, union in_addr_union *in_addr) {
+        DnsServer *s;
+
+        assert(m);
+        assert(in_addr);
+
+        LIST_FOREACH(servers, s, m->dns_servers) {
+
+                if (s->family == family &&
+                    in_addr_equal(family, &s->address, in_addr))
+                        return s;
+        }
+
+        return NULL;
+}
+
+DnsServer *manager_get_dns_server(Manager *m) {
+        assert(m);
+
+        if (!m->current_dns_server)
+                m->current_dns_server = m->dns_servers;
+
+        return m->current_dns_server;
+}
+
+void manager_next_dns_server(Manager *m) {
+        assert(m);
+
+        if (!m->current_dns_server) {
+                m->current_dns_server = m->dns_servers;
+                return;
+        }
+
+        if (!m->current_dns_server)
+                return;
+
+        if (m->current_dns_server->servers_next) {
+                m->current_dns_server = m->current_dns_server->servers_next;
+                return;
+        }
+
+        m->current_dns_server = m->dns_servers;
 }
diff --git a/src/resolve/resolved.c b/src/resolve/resolved.c
index 53f09db73b..275f99c924 100644
--- a/src/resolve/resolved.c
+++ b/src/resolve/resolved.c
@@ -28,7 +28,7 @@
 #include "capability.h"
 
 int main(int argc, char *argv[]) {
-        _cleanup_manager_free_ Manager *m = NULL;
+        _cleanup_(manager_freep) Manager *m = NULL;
         const char *user = "systemd-resolve";
         uid_t uid;
         gid_t gid;
@@ -43,13 +43,13 @@ int main(int argc, char *argv[]) {
         if (argc != 1) {
                 log_error("This program takes no arguments.");
                 r = -EINVAL;
-                goto out;
+                goto finish;
         }
 
         r = get_user_creds(&user, &uid, &gid, NULL, NULL);
         if (r < 0) {
                 log_error("Cannot resolve user name %s: %s", user, strerror(-r));
-                goto out;
+                goto finish;
         }
 
         /* Always create the directory where resolv.conf will live */
@@ -57,33 +57,31 @@ int main(int argc, char *argv[]) {
         if (r < 0) {
                 log_error("Could not create runtime directory: %s",
                           strerror(-r));
-                goto out;
+                goto finish;
         }
 
         r = drop_privileges(uid, gid, 0);
         if (r < 0)
-                goto out;
+                goto finish;
 
         assert_se(sigprocmask_many(SIG_BLOCK, SIGTERM, SIGINT, -1) == 0);
 
         r = manager_new(&m);
         if (r < 0) {
                 log_error("Could not create manager: %s", strerror(-r));
-                goto out;
+                goto finish;
         }
 
-        r = manager_network_monitor_listen(m);
-        if (r < 0) {
-                log_error("Could not listen for network events: %s", strerror(-r));
-                goto out;
-        }
+        r = manager_parse_config_file(m);
+        if (r < 0)
+                return r;
 
-        /* write out default resolv.conf to avoid a
-         * dangling symlink */
-        r = manager_update_resolv_conf(m);
+        /* write finish default resolv.conf to avoid a dangling
+         * symlink */
+        r = manager_write_resolv_conf(m);
         if (r < 0) {
                 log_error("Could not create resolv.conf: %s", strerror(-r));
-                goto out;
+                goto finish;
         }
 
         sd_notify(false,
@@ -93,12 +91,11 @@ int main(int argc, char *argv[]) {
         r = sd_event_loop(m->event);
         if (r < 0) {
                 log_error("Event loop failed: %s", strerror(-r));
-                goto out;
+                goto finish;
         }
 
-out:
-        sd_notify(false,
-                  "STATUS=Shutting down...");
+finish:
+        sd_notify(false, "STATUS=Shutting down...");
 
         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 }
diff --git a/src/resolve/resolved.h b/src/resolve/resolved.h
index ad49c63a41..438730be6e 100644
--- a/src/resolve/resolved.h
+++ b/src/resolve/resolved.h
@@ -1,5 +1,7 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
+#pragma once
+
 /***
   This file is part of systemd.
 
@@ -19,49 +21,76 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#pragma once
-
 #include "sd-event.h"
 #include "sd-network.h"
-
+#include "sd-rtnl.h"
 #include "util.h"
 #include "list.h"
 #include "in-addr-util.h"
+#include "hashmap.h"
 
-typedef struct Address Address;
 typedef struct Manager Manager;
 
-struct Address {
-        unsigned char family;
-
-        union in_addr_union in_addr;
-
-        LIST_FIELDS(Address, addresses);
-};
+#include "resolved-dns-query.h"
+#include "resolved-dns-server.h"
+#include "resolved-dns-scope.h"
 
 struct Manager {
         sd_event *event;
 
-        LIST_HEAD(Address, fallback_dns);
-
         /* network */
-        sd_event_source *network_event_source;
+        Hashmap *links;
+
+        sd_rtnl *rtnl;
+        sd_event_source *rtnl_event_source;
+
         sd_network_monitor *network_monitor;
+        sd_event_source *network_event_source;
+
+        /* unicast dns */
+        int dns_ipv4_fd;
+        int dns_ipv6_fd;
+
+        sd_event_source *dns_ipv4_event_source;
+        sd_event_source *dns_ipv6_event_source;
+
+        Hashmap *dns_query_transactions;
+        LIST_HEAD(DnsQuery, dns_queries);
+
+        LIST_HEAD(DnsServer, dns_servers);
+        DnsServer *current_dns_server;
+
+        LIST_HEAD(DnsScope, dns_scopes);
+        DnsScope *unicast_scope;
+
+        /* dbus */
+        sd_bus *bus;
+        sd_event_source *bus_retry_event_source;
 };
 
 /* Manager */
 
 int manager_new(Manager **ret);
-void manager_free(Manager *m);
+Manager* manager_free(Manager *m);
+
+int manager_parse_config_file(Manager *m);
+int manager_write_resolv_conf(Manager *m);
+
+DnsServer* manager_find_dns_server(Manager *m, unsigned char family, union in_addr_union *in_addr);
+DnsServer *manager_get_dns_server(Manager *m);
+void manager_next_dns_server(Manager *m);
 
-int manager_update_resolv_conf(Manager *m);
-int manager_network_monitor_listen(Manager *m);
+int manager_dns_ipv4_fd(Manager *m);
+int manager_dns_ipv4_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p);
+int manager_dns_ipv4_recv(Manager *m, DnsPacket **ret);
+
+int manager_dns_ipv6_fd(Manager *m);
+int manager_dns_ipv6_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p);
+int manager_dns_ipv6_recv(Manager *m, DnsPacket **ret);
+
+int manager_connect_bus(Manager *m);
 
 DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
-#define _cleanup_manager_free_ _cleanup_(manager_freep)
 
 const struct ConfigPerfItem* resolved_gperf_lookup(const char *key, unsigned length);
-
-int config_parse_dnsv(const char *unit, const char *filename, unsigned line,
-                     const char *section, unsigned section_line, const char *lvalue,
-                     int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_dnsv(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
diff --git a/src/resolve/test-dns-domain.c b/src/resolve/test-dns-domain.c
new file mode 100644
index 0000000000..bd53402be8
--- /dev/null
+++ b/src/resolve/test-dns-domain.c
@@ -0,0 +1,173 @@
+/*-*- 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 <http://www.gnu.org/licenses/>.
+ ***/
+
+#include "log.h"
+#include "resolved-dns-domain.h"
+
+static void test_dns_label_unescape_one(const char *what, const char *expect, size_t buffer_sz, int ret) {
+        char buffer[buffer_sz];
+        int r;
+
+        r = dns_label_unescape(&what, buffer, buffer_sz);
+        assert_se(r == ret);
+
+        if (r < 0)
+                return;
+
+        assert_se(streq(buffer, expect));
+}
+
+static void test_dns_label_unescape(void) {
+        test_dns_label_unescape_one("hallo", "hallo", 6, 5);
+        test_dns_label_unescape_one("hallo", "hallo", 4, -ENOSPC);
+        test_dns_label_unescape_one("", "", 10, 0);
+        test_dns_label_unescape_one("hallo\\.foobar", "hallo.foobar", 20, 12);
+        test_dns_label_unescape_one("hallo.foobar", "hallo", 10, 5);
+        test_dns_label_unescape_one("hallo\n.foobar", "hallo", 20, -EINVAL);
+        test_dns_label_unescape_one("hallo\\", "hallo", 20, -EINVAL);
+        test_dns_label_unescape_one("hallo\\032 ", "hallo  ", 20, 7);
+        test_dns_label_unescape_one(".", "", 20, 0);
+        test_dns_label_unescape_one("..", "", 20, -EINVAL);
+        test_dns_label_unescape_one(".foobar", "", 20, -EINVAL);
+        test_dns_label_unescape_one("foobar.", "foobar", 20, 6);
+}
+
+static void test_dns_label_escape_one(const char *what, size_t l, const char *expect, int ret) {
+        _cleanup_free_ char *t = NULL;
+        int r;
+
+        r = dns_label_escape(what, l, &t);
+        assert(r == ret);
+
+        if (r < 0)
+                return;
+
+        assert_se(streq_ptr(expect, t));
+}
+
+static void test_dns_label_escape(void) {
+        test_dns_label_escape_one("", 0, "", 0);
+        test_dns_label_escape_one("hallo", 5, "hallo", 5);
+        test_dns_label_escape_one("hallo", 6, NULL, -EINVAL);
+        test_dns_label_escape_one("hallo hallo.foobar,waldi", 24, "hallo\\032hallo\\.foobar\\044waldi", 31);
+}
+
+static void test_dns_name_normalize_one(const char *what, const char *expect, int ret) {
+        _cleanup_free_ char *t = NULL;
+        int r;
+
+        r = dns_name_normalize(what, &t);
+        assert_se(r == ret);
+
+        if (r < 0)
+                return;
+
+        assert_se(streq_ptr(expect, t));
+}
+
+static void test_dns_name_normalize(void) {
+        test_dns_name_normalize_one("", "", 0);
+        test_dns_name_normalize_one("f", "f", 0);
+        test_dns_name_normalize_one("f.waldi", "f.waldi", 0);
+        test_dns_name_normalize_one("f \\032.waldi", "f\\032\\032.waldi", 0);
+        test_dns_name_normalize_one("\\000", NULL, -EINVAL);
+        test_dns_name_normalize_one("..", NULL, -EINVAL);
+        test_dns_name_normalize_one(".foobar", NULL, -EINVAL);
+        test_dns_name_normalize_one("foobar.", "foobar", 0);
+        test_dns_name_normalize_one(".", "", 0);
+}
+
+static void test_dns_name_equal_one(const char *a, const char *b, int ret) {
+        int r;
+
+        r = dns_name_equal(a, b);
+        assert_se(r == ret);
+
+        r = dns_name_equal(b, a);
+        assert_se(r == ret);
+}
+
+static void test_dns_name_equal(void) {
+        test_dns_name_equal_one("", "", true);
+        test_dns_name_equal_one("x", "x", true);
+        test_dns_name_equal_one("x", "x.", true);
+        test_dns_name_equal_one("abc.def", "abc.def", true);
+        test_dns_name_equal_one("abc.def", "ABC.def", true);
+        test_dns_name_equal_one("abc.def", "CBA.def", false);
+        test_dns_name_equal_one("", "xxx", false);
+        test_dns_name_equal_one("ab", "a", false);
+        test_dns_name_equal_one("\\000", "xxxx", -EINVAL);
+        test_dns_name_equal_one(".", "", true);
+        test_dns_name_equal_one(".", ".", true);
+        test_dns_name_equal_one("..", "..", -EINVAL);
+}
+
+static void test_dns_name_endswith_one(const char *a, const char *b, int ret) {
+        assert_se(dns_name_endswith(a, b) == ret);
+}
+
+static void test_dns_name_endswith(void) {
+        test_dns_name_endswith_one("", "", true);
+        test_dns_name_endswith_one("", "xxx", false);
+        test_dns_name_endswith_one("xxx", "", true);
+        test_dns_name_endswith_one("x", "x", true);
+        test_dns_name_endswith_one("x", "y", false);
+        test_dns_name_endswith_one("x.y", "y", true);
+        test_dns_name_endswith_one("x.y", "Y", true);
+        test_dns_name_endswith_one("x.y", "x", false);
+        test_dns_name_endswith_one("x.y.z", "Z", true);
+        test_dns_name_endswith_one("x.y.z", "y.Z", true);
+        test_dns_name_endswith_one("x.y.z", "x.y.Z", true);
+        test_dns_name_endswith_one("x.y.z", "waldo", false);
+        test_dns_name_endswith_one("x.y.z.u.v.w", "y.z", false);
+        test_dns_name_endswith_one("x.y.z.u.v.w", "u.v.w", true);
+        test_dns_name_endswith_one("x.y\001.z", "waldo", -EINVAL);
+}
+
+static void test_dns_name_root(void) {
+        assert_se(dns_name_root("") == true);
+        assert_se(dns_name_root(".") == true);
+        assert_se(dns_name_root("xxx") == false);
+        assert_se(dns_name_root("xxx.") == false);
+        assert_se(dns_name_root("..") == -EINVAL);
+}
+
+static void test_dns_name_single_label(void) {
+        assert_se(dns_name_single_label("") == false);
+        assert_se(dns_name_single_label(".") == false);
+        assert_se(dns_name_single_label("..") == -EINVAL);
+        assert_se(dns_name_single_label("x") == true);
+        assert_se(dns_name_single_label("x.") == true);
+        assert_se(dns_name_single_label("xx.yy") == false);
+}
+
+int main(int argc, char *argv[]) {
+
+        test_dns_label_unescape();
+        test_dns_label_escape();
+        test_dns_name_normalize();
+        test_dns_name_equal();
+        test_dns_name_endswith();
+        test_dns_name_root();
+        test_dns_name_single_label();
+
+        return 0;
+}