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network/dhcpv4: add ability to use BOOTP
BOOTP can be used to sign a static IP to clients. Instead of using the four message exchange, and Option 53 (DHCP Message Type) there is only a two message exchange. Add the following network option to enable BOOTP: [DHCPv4] Bootp=yes This will allow a two message request / reply sequence that doesn't require DHCP message types.
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@ -14,19 +14,13 @@
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#define DHCP_CLIENT_MIN_OPTIONS_SIZE 312
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int dhcp_message_init(
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int bootp_message_init(
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DHCPMessage *message,
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uint8_t op,
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uint32_t xid,
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uint8_t type,
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uint16_t arp_type,
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uint8_t hlen,
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const uint8_t *chaddr,
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size_t optlen,
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size_t *optoffset) {
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size_t offset = 0;
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int r;
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const uint8_t *chaddr) {
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assert(IN_SET(op, BOOTREQUEST, BOOTREPLY));
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assert(chaddr || hlen == 0);
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@ -51,6 +45,27 @@ int dhcp_message_init(
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message->xid = htobe32(xid);
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message->magic = htobe32(DHCP_MAGIC_COOKIE);
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return 0;
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}
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int dhcp_message_init(
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DHCPMessage *message,
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uint8_t op,
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uint32_t xid,
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uint8_t type,
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uint16_t arp_type,
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uint8_t hlen,
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const uint8_t *chaddr,
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size_t optlen,
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size_t *optoffset) {
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size_t offset = 0;
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int r;
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r = bootp_message_init(message, op, xid, arp_type, hlen, chaddr);
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if (r < 0)
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return r;
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r = dhcp_option_append(message, optlen, &offset, 0,
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SD_DHCP_OPTION_MESSAGE_TYPE, 1, &type);
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if (r < 0)
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@ -6,6 +6,14 @@
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#include "dhcp-protocol.h"
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int bootp_message_init(
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DHCPMessage *message,
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uint8_t op,
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uint32_t xid,
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uint16_t arp_type,
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uint8_t hlen,
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const uint8_t *chaddr);
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int dhcp_message_init(
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DHCPMessage *message,
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uint8_t op,
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@ -105,6 +105,7 @@ struct sd_dhcp_client {
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int socket_priority;
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bool socket_priority_set;
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bool ipv6_acquired;
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bool bootp;
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};
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static const uint8_t default_req_opts[] = {
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@ -656,6 +657,15 @@ int sd_dhcp_client_set_fallback_lease_lifetime(sd_dhcp_client *client, uint64_t
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return 0;
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}
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int sd_dhcp_client_set_bootp(sd_dhcp_client *client, bool bootp) {
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assert_return(client, -EINVAL);
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assert_return(!sd_dhcp_client_is_running(client), -EBUSY);
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client->bootp = bootp;
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return 0;
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}
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static void client_set_state(sd_dhcp_client *client, DHCPState state) {
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assert(client);
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@ -793,9 +803,15 @@ static int client_message_init(
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if (!packet)
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return -ENOMEM;
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r = dhcp_message_init(&packet->dhcp, BOOTREQUEST, client->xid, type,
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client->arp_type, client->hw_addr.length, client->hw_addr.bytes,
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optlen, &optoffset);
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if (client->bootp) {
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r = bootp_message_init(&packet->dhcp, BOOTREQUEST, client->xid, client->arp_type,
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client->hw_addr.length, client->hw_addr.bytes);
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} else {
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r = dhcp_message_init(&packet->dhcp, BOOTREQUEST, client->xid, type,
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client->arp_type, client->hw_addr.length, client->hw_addr.bytes,
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optlen, &optoffset);
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}
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if (r < 0)
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return r;
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@ -825,14 +841,16 @@ static int client_message_init(
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if (client->request_broadcast || client->arp_type != ARPHRD_ETHER)
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packet->dhcp.flags = htobe16(0x8000);
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/* Some DHCP servers will refuse to issue an DHCP lease if the Client
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Identifier option is not set */
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r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0,
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SD_DHCP_OPTION_CLIENT_IDENTIFIER,
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client->client_id.size,
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client->client_id.raw);
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if (r < 0)
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return r;
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if (!client->bootp) {
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/* Some DHCP servers will refuse to issue an DHCP lease if the Client
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Identifier option is not set */
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r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0,
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SD_DHCP_OPTION_CLIENT_IDENTIFIER,
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client->client_id.size,
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client->client_id.raw);
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if (r < 0)
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return r;
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}
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/* RFC2131 section 3.5:
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in its initial DHCPDISCOVER or DHCPREQUEST message, a
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@ -1509,13 +1527,15 @@ static int client_parse_message(
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}
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r = dhcp_option_parse(message, len, dhcp_lease_parse_options, lease, &error_message);
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if (r < 0)
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if (r == -ENOMSG && client->bootp)
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log_dhcp_client(client, "No DHCP options found in bootp message, continuing.");
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else if (r < 0)
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return log_dhcp_client_errno(client, r, "Failed to parse DHCP options, ignoring: %m");
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switch (client->state) {
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case DHCP_STATE_SELECTING:
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if (r == DHCP_ACK) {
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if (!client->rapid_commit)
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if (!client->rapid_commit && !client->bootp)
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return log_dhcp_client_errno(client, SYNTHETIC_ERRNO(ENOMSG),
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"received unexpected ACK, ignoring.");
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if (!lease->rapid_commit)
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@ -1532,8 +1552,11 @@ static int client_parse_message(
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if (lease->lifetime == 0 && client->fallback_lease_lifetime > 0)
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lease->lifetime = client->fallback_lease_lifetime;
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} else
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return log_dhcp_client_errno(client, SYNTHETIC_ERRNO(ENOMSG),
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"received unexpected message, ignoring.");
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if (client->bootp)
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log_dhcp_client(client, "Ignoring return value %d for bootp message", r);
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else
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return log_dhcp_client_errno(client, SYNTHETIC_ERRNO(ENOMSG),
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"received unexpected message, ignoring.");
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break;
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@ -1561,6 +1584,9 @@ static int client_parse_message(
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lease->next_server = message->siaddr;
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lease->address = message->yiaddr;
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if (client->bootp)
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lease->lifetime = USEC_INFINITY;
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if (lease->address == 0 ||
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lease->server_address == 0 ||
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lease->lifetime == 0)
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@ -1601,7 +1627,7 @@ static int client_handle_offer_or_rapid_ack(sd_dhcp_client *client, DHCPMessage
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dhcp_lease_unref_and_replace(client->lease, lease);
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if (client->lease->rapid_commit) {
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if (client->lease->rapid_commit || client->bootp) {
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log_dhcp_client(client, "ACK");
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return SD_DHCP_CLIENT_EVENT_IP_ACQUIRE;
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}
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@ -2007,7 +2033,7 @@ static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message, s
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if (r < 0)
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return 0; /* invalid message, let's ignore it */
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if (client->lease->rapid_commit)
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if (client->lease->rapid_commit || client->bootp)
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/* got a successful rapid commit */
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return client_enter_bound(client, r);
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@ -1485,6 +1485,10 @@ static int dhcp4_configure(Link *link) {
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if (r < 0)
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return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to allocate DHCPv4 client: %m");
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r = sd_dhcp_client_set_bootp(link->dhcp_client, link->network->dhcp_send_bootp);
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if (r < 0)
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return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set BOOTP flag: %m");
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r = sd_dhcp_client_attach_event(link->dhcp_client, link->manager->event, 0);
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if (r < 0)
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return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to attach event to DHCPv4 client: %m");
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@ -243,6 +243,7 @@ DHCPv4.QuickAck, config_parse_bool,
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DHCPv4.RequestOptions, config_parse_dhcp_request_options, AF_INET, 0
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DHCPv4.Anonymize, config_parse_bool, 0, offsetof(Network, dhcp_anonymize)
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DHCPv4.SendHostname, config_parse_dhcp_send_hostname, AF_INET, 0
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DHCPv4.Bootp, config_parse_bool, 0, offsetof(Network, dhcp_send_bootp)
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DHCPv4.Hostname, config_parse_hostname, 0, offsetof(Network, dhcp_hostname)
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DHCPv4.Label, config_parse_dhcp_label, 0, offsetof(Network, dhcp_label)
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DHCPv4.RequestBroadcast, config_parse_tristate, 0, offsetof(Network, dhcp_broadcast)
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@ -405,6 +405,7 @@ int network_load_one(Manager *manager, OrderedHashmap **networks, const char *fi
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.dhcp_broadcast = -1,
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.dhcp_ipv6_only_mode = -1,
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.dhcp_6rd_prefix_route_type = RTN_UNREACHABLE,
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.dhcp_send_bootp = false,
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.dhcp6_use_address = true,
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.dhcp6_use_pd_prefix = true,
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@ -179,6 +179,7 @@ struct Network {
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OrderedHashmap *dhcp_client_send_vendor_options;
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char *dhcp_netlabel;
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NFTSetContext dhcp_nft_set_context;
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bool dhcp_send_bootp;
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/* DHCPv6 Client support */
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bool dhcp6_use_address;
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@ -147,6 +147,9 @@ int sd_dhcp_client_set_socket_priority(
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int sd_dhcp_client_set_fallback_lease_lifetime(
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sd_dhcp_client *client,
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uint64_t fallback_lease_lifetime);
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int sd_dhcp_client_set_bootp(
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sd_dhcp_client *client,
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bool bootp);
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int sd_dhcp_client_add_option(sd_dhcp_client *client, sd_dhcp_option *v);
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int sd_dhcp_client_add_vendor_option(sd_dhcp_client *client, sd_dhcp_option *v);
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