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networkd: send hostname to dhcp server
Send hostname (option 12) in DISCOVER and REQUEST messages so the DHCP server could use it to register with dynamic DNS and such. To opt-out of this behaviour set SendHostname to false in [DHCP] section of .network file [tomegun: rebased, made sure a failing set_hostname is a noop and moved config from DHCPv4 to DHCP]
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@ -404,6 +404,13 @@
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be used on the current link. Defaults to false.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SendHostname=</varname></term>
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<listitem>
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<para>When true (the default), the machine's hostname will be sent to the DHCP
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server</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>UseHostname=</varname></term>
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<listitem>
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@ -56,6 +56,7 @@ struct sd_dhcp_client {
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uint8_t type;
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struct ether_addr mac_addr;
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} _packed_ client_id;
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char *hostname;
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uint32_t xid;
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usec_t start_time;
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uint16_t secs;
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@ -178,6 +179,27 @@ int sd_dhcp_client_set_mac(sd_dhcp_client *client,
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return 0;
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}
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int sd_dhcp_client_set_hostname(sd_dhcp_client *client,
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const char *hostname) {
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char *new_hostname = NULL;
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assert_return(client, -EINVAL);
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if (streq_ptr(client->hostname, hostname))
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return 0;
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if (hostname) {
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new_hostname = strdup(hostname);
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if (!new_hostname)
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return -ENOMEM;
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}
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free(client->hostname);
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client->hostname = new_hostname;
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return 0;
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}
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int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) {
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assert_return(client, -EINVAL);
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assert_return(ret, -EINVAL);
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@ -386,6 +408,17 @@ static int client_send_discover(sd_dhcp_client *client) {
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return r;
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}
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/* it is unclear from RFC 2131 if client should send hostname in
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DHCPDISCOVER but dhclient does and so we do as well
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*/
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if (client->hostname) {
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r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
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DHCP_OPTION_HOST_NAME,
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strlen(client->hostname), client->hostname);
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if (r < 0)
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return r;
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}
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r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
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DHCP_OPTION_END, 0, NULL);
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if (r < 0)
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@ -477,6 +510,14 @@ static int client_send_request(sd_dhcp_client *client) {
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return -EINVAL;
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}
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if (client->hostname) {
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r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
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DHCP_OPTION_HOST_NAME,
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strlen(client->hostname), client->hostname);
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if (r < 0)
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return r;
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}
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r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
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DHCP_OPTION_END, 0, NULL);
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if (r < 0)
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@ -1364,6 +1405,7 @@ sd_dhcp_client *sd_dhcp_client_unref(sd_dhcp_client *client) {
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sd_dhcp_lease_unref(client->lease);
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free(client->req_opts);
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free(client->hostname);
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free(client);
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}
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@ -21,6 +21,7 @@
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#include <netinet/ether.h>
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#include <linux/if.h>
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#include <unistd.h>
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#include "networkd.h"
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#include "libudev-private.h"
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@ -1927,6 +1928,18 @@ static int link_enter_enslave(Link *link) {
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return 0;
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}
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/* make sure the hostname is not "localhost" */
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static bool is_localhost(const char *hostname) {
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assert(hostname);
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return streq(hostname, "localhost") ||
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streq(hostname, "localhost.") ||
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endswith(hostname, ".localhost") ||
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endswith(hostname, ".localhost.") ||
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endswith(hostname, ".localdomain") ||
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endswith(hostname, ".localdomain.");
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}
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static int link_configure(Link *link) {
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int r;
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@ -1992,6 +2005,7 @@ static int link_configure(Link *link) {
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if (r < 0)
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return r;
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}
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if (link->network->dhcp_routes) {
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r = sd_dhcp_client_set_request_option(link->dhcp_client, DHCP_OPTION_STATIC_ROUTE);
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if (r < 0)
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@ -2000,6 +2014,18 @@ static int link_configure(Link *link) {
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if (r < 0)
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return r;
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}
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if (link->network->dhcp_sendhost) {
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_cleanup_free_ char *hostname = gethostname_malloc();
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if (!hostname)
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return -ENOMEM;
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if (!is_localhost(hostname)) {
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r = sd_dhcp_client_set_hostname(link->dhcp_client, hostname);
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if (r < 0)
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return r;
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}
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}
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}
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if (link->network->dhcp_server) {
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@ -47,11 +47,12 @@ DHCP.UseDNS, config_parse_bool, 0,
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DHCP.UseMTU, config_parse_bool, 0, offsetof(Network, dhcp_mtu)
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DHCP.UseHostname, config_parse_bool, 0, offsetof(Network, dhcp_hostname)
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DHCP.UseDomainName, config_parse_bool, 0, offsetof(Network, dhcp_domainname)
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DHCP.UseRoutes, config_parse_bool, 0, offsetof(Network, dhcp_routes)
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DHCP.SendHostname, config_parse_bool, 0, offsetof(Network, dhcp_sendhost)
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DHCP.CriticalConnection, config_parse_bool, 0, offsetof(Network, dhcp_critical)
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/* backwards compatibility */
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/* backwards compatibility: do not add new entries to this section */
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DHCPv4.UseDNS, config_parse_bool, 0, offsetof(Network, dhcp_dns)
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DHCPv4.UseMTU, config_parse_bool, 0, offsetof(Network, dhcp_mtu)
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DHCPv4.UseHostname, config_parse_bool, 0, offsetof(Network, dhcp_hostname)
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DHCPv4.UseDomainName, config_parse_bool, 0, offsetof(Network, dhcp_domainname)
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DHCPv4.UseRoutes, config_parse_bool, 0, offsetof(Network, dhcp_routes)
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DHCPv4.CriticalConnection, config_parse_bool, 0, offsetof(Network, dhcp_critical)
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@ -90,6 +90,7 @@ static int network_load_one(Manager *manager, const char *filename) {
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network->dhcp_hostname = true;
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network->dhcp_domainname = true;
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network->dhcp_routes = true;
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network->dhcp_sendhost = true;
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r = config_parse(NULL, filename, file, "Match\0Network\0Address\0Route\0DHCPv4\0", config_item_perf_lookup,
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(void*) network_network_gperf_lookup, false, false, network);
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@ -169,6 +169,7 @@ struct Network {
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bool dhcp_mtu;
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bool dhcp_hostname;
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bool dhcp_domainname;
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bool dhcp_sendhost;
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bool dhcp_critical;
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bool dhcp_routes;
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bool ipv4ll;
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@ -51,6 +51,7 @@ int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
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int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index);
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int sd_dhcp_client_set_mac(sd_dhcp_client *client,
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const struct ether_addr *addr);
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int sd_dhcp_client_set_hostname(sd_dhcp_client *client, const char *hostname);
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int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret);
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int sd_dhcp_client_stop(sd_dhcp_client *client);
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