#include <ctype.h>

#include <net/if.h>

#include "alloc-util.h"

#include "conf-files.h"

#include "conf-parser.h"

#include "dns-domain.h"

#include "fd-util.h"

#include "hostname-util.h"

#include "network-internal.h"

#include "networkd-network.h"

#include "networkd.h"

#include "parse-util.h"

#include "set.h"

#include "stat-util.h"

#include "string-table.h"

#include "string-util.h"

#include "util.h"

static int network_load_one(Manager *manager, const char *filename) {

_cleanup_network_free_ Network *network = NULL;

_cleanup_fclose_ FILE *file = NULL;

char *d;

Route *route;

Address *address;

int r;

assert(manager);

assert(filename);

file = fopen(filename, "re");

if (!file) {

if (errno == ENOENT)

return 0;

else

return -errno;

}

if (null_or_empty_fd(fileno(file))) {

log_debug("Skipping empty file: %s", filename);

return 0;

}

network = new0(Network, 1);

if (!network)

return log_oom();

network->manager = manager;

LIST_HEAD_INIT(network->static_addresses);

LIST_HEAD_INIT(network->static_routes);

LIST_HEAD_INIT(network->static_fdb_entries);

network->stacked_netdevs = hashmap_new(&string_hash_ops);

if (!network->stacked_netdevs)

return log_oom();

network->addresses_by_section = hashmap_new(NULL);

if (!network->addresses_by_section)

return log_oom();

network->routes_by_section = hashmap_new(NULL);

if (!network->routes_by_section)

return log_oom();

network->fdb_entries_by_section = hashmap_new(NULL);

if (!network->fdb_entries_by_section)

return log_oom();

network->filename = strdup(filename);

if (!network->filename)

return log_oom();

network->name = strdup(basename(filename));

if (!network->name)

return log_oom();

d = strrchr(network->name, '.');

if (!d)

return -EINVAL;

assert(streq(d, ".network"));

*d = '\0';

network->dhcp = ADDRESS_FAMILY_NO;

network->dhcp_use_ntp = true;

network->dhcp_use_dns = true;

network->dhcp_use_hostname = true;

network->dhcp_use_routes = true;

network->dhcp_send_hostname = true;

network->dhcp_route_metric = DHCP_ROUTE_METRIC;

network->dhcp_client_identifier = DHCP_CLIENT_ID_DUID;

network->dhcp_server_emit_dns = true;

network->dhcp_server_emit_ntp = true;

network->dhcp_server_emit_timezone = true;

network->use_bpdu = true;

network->allow_port_to_be_root = true;

network->unicast_flood = true;

network->llmnr = RESOLVE_SUPPORT_YES;

network->mdns = RESOLVE_SUPPORT_NO;

network->dnssec_mode = _DNSSEC_MODE_INVALID;

network->link_local = ADDRESS_FAMILY_IPV6;

network->ipv6_privacy_extensions = IPV6_PRIVACY_EXTENSIONS_NO;

network->ipv6_accept_ra = -1;

network->ipv6_dad_transmits = -1;

network->ipv6_hop_limit = -1;

r = config_parse(NULL, filename, file,

"Match\0"

"Link\0"

"Network\0"

"Address\0"

"Route\0"

"DHCP\0"

"DHCPv4\0" /* compat */

"DHCPServer\0"

"Bridge\0"

"BridgeFDB\0",

config_item_perf_lookup, network_network_gperf_lookup,

false, false, true, network);

if (r < 0)

return r;

/* IPMasquerade=yes implies IPForward=yes */

if (network->ip_masquerade)

network->ip_forward |= ADDRESS_FAMILY_IPV4;

LIST_PREPEND(networks, manager->networks, network);

r = hashmap_ensure_allocated(&manager->networks_by_name, &string_hash_ops);

if (r < 0)

return r;

r = hashmap_put(manager->networks_by_name, network->name, network);

if (r < 0)

return r;

LIST_FOREACH(routes, route, network->static_routes) {

if (!route->family) {

log_warning("Route section without Gateway field configured in %s. "

"Ignoring", filename);

return 0;

}

}

LIST_FOREACH(addresses, address, network->static_addresses) {

if (!address->family) {

log_warning("Address section without Address field configured in %s. "

"Ignoring", filename);

return 0;

}

}

network = NULL;

return 0;

}

int network_load(Manager *manager) {

Network *network;

_cleanup_strv_free_ char **files = NULL;

char **f;

int r;

assert(manager);

while ((network = manager->networks))

network_free(network);

r = conf_files_list_strv(&files, ".network", NULL, network_dirs);

if (r < 0)

return log_error_errno(r, "Failed to enumerate network files: %m");

STRV_FOREACH_BACKWARDS(f, files) {

r = network_load_one(manager, *f);

if (r < 0)

return r;

}

return 0;

}

void network_free(Network *network) {

NetDev *netdev;

Route *route;

Address *address;

FdbEntry *fdb_entry;

Iterator i;

if (!network)

return;

free(network->filename);

free(network->match_mac);

strv_free(network->match_path);

strv_free(network->match_driver);

strv_free(network->match_type);

strv_free(network->match_name);

free(network->description);

free(network->dhcp_vendor_class_identifier);

free(network->dhcp_hostname);

free(network->mac);

strv_free(network->ntp);

strv_free(network->dns);

strv_free(network->search_domains);

strv_free(network->route_domains);

strv_free(network->bind_carrier);

netdev_unref(network->bridge);

netdev_unref(network->bond);

HASHMAP_FOREACH(netdev, network->stacked_netdevs, i) {

hashmap_remove(network->stacked_netdevs, netdev->ifname);

netdev_unref(netdev);

}

hashmap_free(network->stacked_netdevs);

while ((route = network->static_routes))

route_free(route);

while ((address = network->static_addresses))

address_free(address);

while ((fdb_entry = network->static_fdb_entries))

fdb_entry_free(fdb_entry);

hashmap_free(network->addresses_by_section);

hashmap_free(network->routes_by_section);

hashmap_free(network->fdb_entries_by_section);

if (network->manager) {

if (network->manager->networks)

LIST_REMOVE(networks, network->manager->networks, network);

if (network->manager->networks_by_name)

hashmap_remove(network->manager->networks_by_name, network->name);

}

free(network->name);

condition_free_list(network->match_host);

condition_free_list(network->match_virt);

condition_free_list(network->match_kernel);

condition_free_list(network->match_arch);

free(network->dhcp_server_timezone);

free(network->dhcp_server_dns);

free(network->dhcp_server_ntp);

set_free_free(network->dnssec_negative_trust_anchors);

free(network);

}

int network_get_by_name(Manager *manager, const char *name, Network **ret) {

Network *network;

assert(manager);

assert(name);

assert(ret);

network = hashmap_get(manager->networks_by_name, name);

if (!network)

return -ENOENT;

*ret = network;

return 0;

}

int network_get(Manager *manager, struct udev_device *device,

const char *ifname, const struct ether_addr *address,

Network **ret) {

Network *network;

struct udev_device *parent;

const char *path = NULL, *parent_driver = NULL, *driver = NULL, *devtype = NULL;

assert(manager);

assert(ret);

if (device) {

path = udev_device_get_property_value(device, "ID_PATH");

parent = udev_device_get_parent(device);

if (parent)

parent_driver = udev_device_get_driver(parent);

driver = udev_device_get_property_value(device, "ID_NET_DRIVER");

devtype = udev_device_get_devtype(device);

}

LIST_FOREACH(networks, network, manager->networks) {

if (net_match_config(network->match_mac, network->match_path,

network->match_driver, network->match_type,

network->match_name, network->match_host,

network->match_virt, network->match_kernel,

network->match_arch,

address, path, parent_driver, driver,

devtype, ifname)) {

if (network->match_name && device) {

const char *attr;

uint8_t name_assign_type = NET_NAME_UNKNOWN;

attr = udev_device_get_sysattr_value(device, "name_assign_type");

if (attr)

(void) safe_atou8(attr, &name_assign_type);

if (name_assign_type == NET_NAME_ENUM)

log_warning("%s: found matching network '%s', based on potentially unpredictable ifname",

ifname, network->filename);

else

log_debug("%s: found matching network '%s'", ifname, network->filename);

} else

log_debug("%s: found matching network '%s'", ifname, network->filename);

*ret = network;

return 0;

}

}

*ret = NULL;

return -ENOENT;

}

int network_apply(Manager *manager, Network *network, Link *link) {

int r;

assert(manager);

assert(network);

assert(link);

link->network = network;

if (network->ipv4ll_route) {

Route *route;

r = route_new_static(network, 0, &route);

if (r < 0)

return r;

r = inet_pton(AF_INET, "169.254.0.0", &route->dst.in);

if (r == 0)

return -EINVAL;

if (r < 0)

return -errno;

route->family = AF_INET;

route->dst_prefixlen = 16;

route->scope = RT_SCOPE_LINK;

route->priority = IPV4LL_ROUTE_METRIC;

route->protocol = RTPROT_STATIC;

}

if (!strv_isempty(network->dns) ||

!strv_isempty(network->ntp) ||

!strv_isempty(network->search_domains) ||

!strv_isempty(network->route_domains)) {

manager_dirty(manager);

link_dirty(link);

}

return 0;

}

int config_parse_netdev(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) {

Network *network = userdata;

_cleanup_free_ char *kind_string = NULL;

char *p;

NetDev *netdev;

NetDevKind kind;

int r;

assert(filename);

assert(lvalue);

assert(rvalue);

assert(data);

kind_string = strdup(lvalue);

if (!kind_string)

return log_oom();

/* the keys are CamelCase versions of the kind */

for (p = kind_string; *p; p++)

*p = tolower(*p);

kind = netdev_kind_from_string(kind_string);

if (kind == _NETDEV_KIND_INVALID) {

log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid NetDev kind: %s", lvalue);

return 0;

}

r = netdev_get(network->manager, rvalue, &netdev);

if (r < 0) {

log_syntax(unit, LOG_ERR, filename, line, r, "%s could not be found, ignoring assignment: %s", lvalue, rvalue);

return 0;

}

if (netdev->kind != kind) {

log_syntax(unit, LOG_ERR, filename, line, 0, "NetDev is not a %s, ignoring assignment: %s", lvalue, rvalue);

return 0;

}

switch (kind) {

case NETDEV_KIND_BRIDGE:

network->bridge = netdev;

break;

case NETDEV_KIND_BOND:

network->bond = netdev;

break;

case NETDEV_KIND_VLAN:

case NETDEV_KIND_MACVLAN:

case NETDEV_KIND_MACVTAP:

case NETDEV_KIND_IPVLAN:

case NETDEV_KIND_VXLAN:

r = hashmap_put(network->stacked_netdevs, netdev->ifname, netdev);

if (r < 0) {

log_syntax(unit, LOG_ERR, filename, line, r, "Can not add VLAN '%s' to network: %m", rvalue);

return 0;

}

break;

default:

assert_not_reached("Can not parse NetDev");

}

netdev_ref(netdev);

return 0;

}

int config_parse_domains(

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) {

const char *p;

Network *n = data;

int r;

assert(n);

assert(lvalue);

assert(rvalue);

if (isempty(rvalue)) {

n->search_domains = strv_free(n->search_domains);

n->route_domains = strv_free(n->route_domains);

return 0;

}

p = rvalue;

for (;;) {

_cleanup_free_ char *w = NULL, *normalized = NULL;

const char *domain;

bool is_route;

r = extract_first_word(&p, &w, NULL, 0);

if (r < 0) {

log_syntax(unit, LOG_ERR, filename, line, r, "Failed to extract search or route domain, ignoring: %s", rvalue);

break;

}

if (r == 0)

break;

is_route = w[0] == '~';

domain = is_route ? w + 1 : w;

if (dns_name_is_root(domain) || streq(domain, "*")) {

/* If the root domain appears as is, or the special token "*" is found, we'll consider this as

is_route = true;

domain = "."; /* make sure we don't allow empty strings, thus write the root domain as "." */

} else {

r = dns_name_normalize(domain, &normalized);

if (r < 0) {

log_syntax(unit, LOG_ERR, filename, line, r, "'%s' is not a valid domain name, ignoring.", domain);

continue;

}

domain = normalized;

if (is_localhost(domain)) {

log_syntax(unit, LOG_ERR, filename, line, 0, "'localhost' domain names may not be configure as search or route domains, ignoring assignment: %s", domain);

continue;

}

}

if (is_route) {

r = strv_extend(&n->route_domains, domain);

if (r < 0)

return log_oom();

} else {

r = strv_extend(&n->search_domains, domain);

if (r < 0)

return log_oom();

}

}

strv_uniq(n->route_domains);

strv_uniq(n->search_domains);

return 0;

}

int config_parse_tunnel(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) {

Network *network = userdata;

NetDev *netdev;

int r;

assert(filename);

assert(lvalue);

assert(rvalue);

assert(data);

r = netdev_get(network->manager, rvalue, &netdev);

if (r < 0) {

log_syntax(unit, LOG_ERR, filename, line, r, "Tunnel is invalid, ignoring assignment: %s", rvalue);

return 0;

}

if (netdev->kind != NETDEV_KIND_IPIP &&

netdev->kind != NETDEV_KIND_SIT &&

netdev->kind != NETDEV_KIND_GRE &&

netdev->kind != NETDEV_KIND_GRETAP &&

netdev->kind != NETDEV_KIND_IP6GRE &&

netdev->kind != NETDEV_KIND_IP6GRETAP &&

netdev->kind != NETDEV_KIND_VTI &&

netdev->kind != NETDEV_KIND_VTI6 &&

netdev->kind != NETDEV_KIND_IP6TNL

) {

log_syntax(unit, LOG_ERR, filename, line, 0,

"NetDev is not a tunnel, ignoring assignment: %s", rvalue);

return 0;

}

r = hashmap_put(network->stacked_netdevs, netdev->ifname, netdev);

if (r < 0) {

log_syntax(unit, LOG_ERR, filename, line, r, "Cannot add VLAN '%s' to network, ignoring: %m", rvalue);

return 0;

}

netdev_ref(netdev);

return 0;

}

int config_parse_ipv4ll(

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) {

AddressFamilyBoolean *link_local = data;

assert(filename);

assert(lvalue);

assert(rvalue);

assert(data);

/* Note that this is mostly like

if (parse_boolean(rvalue))

*link_local |= ADDRESS_FAMILY_IPV4;

else

*link_local &= ~ADDRESS_FAMILY_IPV4;

return 0;

}

int config_parse_dhcp(

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) {

AddressFamilyBoolean *dhcp = data, s;

assert(filename);

assert(lvalue);

assert(rvalue);

assert(data);

/* Note that this is mostly like

s = address_family_boolean_from_string(rvalue);

if (s < 0) {

/* Previously, we had a slightly different enum here,

if (streq(rvalue, "none"))

s = ADDRESS_FAMILY_NO;

else if (streq(rvalue, "v4"))

s = ADDRESS_FAMILY_IPV4;

else if (streq(rvalue, "v6"))

s = ADDRESS_FAMILY_IPV6;

else if (streq(rvalue, "both"))

s = ADDRESS_FAMILY_YES;

else {

log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse DHCP option, ignoring: %s", rvalue);

return 0;

}

}

*dhcp = s;

return 0;

}

static const char* const dhcp_client_identifier_table[_DHCP_CLIENT_ID_MAX] = {

[DHCP_CLIENT_ID_MAC] = "mac",

[DHCP_CLIENT_ID_DUID] = "duid"

};

DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(dhcp_client_identifier, DCHPClientIdentifier);

DEFINE_CONFIG_PARSE_ENUM(config_parse_dhcp_client_identifier, dhcp_client_identifier, DCHPClientIdentifier, "Failed to parse client identifier type");

int config_parse_ipv6token(

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) {

union in_addr_union buffer;

struct in6_addr *token = data;

int r;

assert(filename);

assert(lvalue);

assert(rvalue);

assert(token);

r = in_addr_from_string(AF_INET6, rvalue, &buffer);

if (r < 0) {

log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse IPv6 token, ignoring: %s", rvalue);

return 0;

}

r = in_addr_is_null(AF_INET6, &buffer);

if (r != 0) {

log_syntax(unit, LOG_ERR, filename, line, r, "IPv6 token can not be the ANY address, ignoring: %s", rvalue);

return 0;

}

if ((buffer.in6.s6_addr32[0] | buffer.in6.s6_addr32[1]) != 0) {

log_syntax(unit, LOG_ERR, filename, line, 0, "IPv6 token can not be longer than 64 bits, ignoring: %s", rvalue);

return 0;

}

*token = buffer.in6;

return 0;

}

static const char* const ipv6_privacy_extensions_table[_IPV6_PRIVACY_EXTENSIONS_MAX] = {

[IPV6_PRIVACY_EXTENSIONS_NO] = "no",

[IPV6_PRIVACY_EXTENSIONS_PREFER_PUBLIC] = "prefer-public",

[IPV6_PRIVACY_EXTENSIONS_YES] = "yes",

};

DEFINE_STRING_TABLE_LOOKUP(ipv6_privacy_extensions, IPv6PrivacyExtensions);

int config_parse_ipv6_privacy_extensions(

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) {

IPv6PrivacyExtensions *ipv6_privacy_extensions = data;

int k;

assert(filename);

assert(lvalue);

assert(rvalue);

assert(ipv6_privacy_extensions);

/* Our enum shall be a superset of booleans, hence first try

k = parse_boolean(rvalue);

if (k > 0)

*ipv6_privacy_extensions = IPV6_PRIVACY_EXTENSIONS_YES;

else if (k == 0)

*ipv6_privacy_extensions = IPV6_PRIVACY_EXTENSIONS_NO;

else {

IPv6PrivacyExtensions s;

s = ipv6_privacy_extensions_from_string(rvalue);

if (s < 0) {

if (streq(rvalue, "kernel"))

s = _IPV6_PRIVACY_EXTENSIONS_INVALID;

else {

log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse IPv6 privacy extensions option, ignoring: %s", rvalue);

return 0;

}

}

*ipv6_privacy_extensions = s;

}

return 0;

}

int config_parse_hostname(

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) {

char **hostname = data, *hn = NULL;

int r;

assert(filename);

assert(lvalue);

assert(rvalue);

r = config_parse_string(unit, filename, line, section, section_line, lvalue, ltype, rvalue, &hn, userdata);

if (r < 0)

return r;

if (!hostname_is_valid(hn, false)) {

log_syntax(unit, LOG_ERR, filename, line, 0, "Hostname is not valid, ignoring assignment: %s", rvalue);

free(hn);

return 0;

}

free(*hostname);

*hostname = hostname_cleanup(hn);

return 0;

}

int config_parse_timezone(

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) {

char **datap = data, *tz = NULL;

int r;

assert(filename);

assert(lvalue);

assert(rvalue);

r = config_parse_string(unit, filename, line, section, section_line, lvalue, ltype, rvalue, &tz, userdata);

if (r < 0)

return r;

if (!timezone_is_valid(tz)) {

log_syntax(unit, LOG_ERR, filename, line, 0, "Timezone is not valid, ignoring assignment: %s", rvalue);

free(tz);

return 0;

}

free(*datap);

*datap = tz;

return 0;

}

int config_parse_dhcp_server_dns(

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) {

Network *n = data;

const char *p = rvalue;

int r;

assert(filename);

assert(lvalue);

assert(rvalue);

for (;;) {

_cleanup_free_ char *w = NULL;

struct in_addr a, *m;

r = extract_first_word(&p, &w, NULL, 0);

if (r < 0) {

log_syntax(unit, LOG_ERR, filename, line, r, "Failed to extract word, ignoring: %s", rvalue);

return 0;

}

if (r == 0)

return 0;

if (inet_pton(AF_INET, w, &a) <= 0) {

log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse DNS server address, ignoring: %s", w);

continue;

}

m = realloc(n->dhcp_server_dns, (n->n_dhcp_server_dns + 1) * sizeof(struct in_addr));

if (!m)

return log_oom();

m[n->n_dhcp_server_dns++] = a;

n->dhcp_server_dns = m;

}

}

int config_parse_dhcp_server_ntp(

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) {

Network *n = data;

const char *p = rvalue;

int r;

assert(filename);

assert(lvalue);

assert(rvalue);

for (;;) {

_cleanup_free_ char *w = NULL;

struct in_addr a, *m;

r = extract_first_word(&p, &w, NULL, 0);

if (r < 0) {

log_syntax(unit, LOG_ERR, filename, line, r, "Failed to extract word, ignoring: %s", rvalue);

return 0;

}

if (r == 0)

return 0;

if (inet_pton(AF_INET, w, &a) <= 0) {

log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse NTP server address, ignoring: %s", w);

continue;

}

m = realloc(n->dhcp_server_ntp, (n->n_dhcp_server_ntp + 1) * sizeof(struct in_addr));

if (!m)

return log_oom();

m[n->n_dhcp_server_ntp++] = a;

n->dhcp_server_ntp = m;

}

}

int config_parse_dnssec_negative_trust_anchors(

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) {

const char *p = rvalue;

Network *n = data;

int r;

assert(n);

assert(lvalue);

assert(rvalue);

if (isempty(rvalue)) {

n->dnssec_negative_trust_anchors = set_free_free(n->dnssec_negative_trust_anchors);

return 0;

}

for (;;) {

_cleanup_free_ char *w = NULL;

r = extract_first_word(&p, &w, NULL, 0);

if (r < 0) {

log_syntax(unit, LOG_ERR, filename, line, r, "Failed to extract negative trust anchor domain, ignoring: %s", rvalue);

break;

}

if (r == 0)

break;

r = dns_name_is_valid(w);

if (r <= 0) {

log_syntax(unit, LOG_ERR, filename, line, r, "%s is not a valid domain name, ignoring.", w);

continue;

}

r = set_put(n->dnssec_negative_trust_anchors, w);

if (r < 0)

return log_oom();

if (r > 0)

w = NULL;

}

return 0;

}

DEFINE_CONFIG_PARSE_ENUM(config_parse_dhcp_use_domains, dhcp_use_domains, DHCPUseDomains, "Failed to parse DHCP use domains setting");

static const char* const dhcp_use_domains_table[_DHCP_USE_DOMAINS_MAX] = {

[DHCP_USE_DOMAINS_NO] = "no",

[DHCP_USE_DOMAINS_ROUTE] = "route",

[DHCP_USE_DOMAINS_YES] = "yes",

};

DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(dhcp_use_domains, DHCPUseDomains, DHCP_USE_DOMAINS_YES);