#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) {

r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "Hostname %s does not have RR of this type", q->request_hostname);

break;

}

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) {

r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "Address %s does not have RR of this type", ip);

break;

}

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

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;

}