#include <stdio.h>
#include <net/ethernet.h>
#include <net/if_arp.h>
+#include <linux/if_infiniband.h>
+#include <netinet/ether.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include "util.h"
#include "list.h"
#include "refcnt.h"
+#include "async.h"
#include "dhcp-protocol.h"
#include "dhcp-internal.h"
#include "dhcp-lease-internal.h"
#include "sd-dhcp-client.h"
+#define MAX_CLIENT_ID_LEN 64 /* Arbitrary limit */
+#define MAX_MAC_ADDR_LEN INFINIBAND_ALEN
+
struct sd_dhcp_client {
RefCount n_ref;
int fd;
union sockaddr_union link;
sd_event_source *receive_message;
+ bool request_broadcast;
uint8_t *req_opts;
size_t req_opts_allocated;
size_t req_opts_size;
be32_t last_addr;
- struct {
- uint8_t type;
- struct ether_addr mac_addr;
- } _packed_ client_id;
+ uint8_t mac_addr[MAX_MAC_ADDR_LEN];
+ size_t mac_addr_len;
+ uint16_t arp_type;
+ union {
+ struct {
+ uint8_t type; /* 0: Generic (non-LL) (RFC 2132) */
+ uint8_t data[MAX_CLIENT_ID_LEN];
+ } _packed_ gen;
+ struct {
+ uint8_t type; /* 1: Ethernet Link-Layer (RFC 2132) */
+ uint8_t haddr[ETH_ALEN];
+ } _packed_ eth;
+ struct {
+ uint8_t type; /* 2 - 254: ARP/Link-Layer (RFC 2132) */
+ uint8_t haddr[0];
+ } _packed_ ll;
+ struct {
+ uint8_t type; /* 255: Node-specific (RFC 4361) */
+ uint8_t iaid[4];
+ uint8_t duid[MAX_CLIENT_ID_LEN - 4];
+ } _packed_ ns;
+ struct {
+ uint8_t type;
+ uint8_t data[MAX_CLIENT_ID_LEN];
+ } _packed_ raw;
+ } client_id;
+ size_t client_id_len;
+ char *hostname;
+ char *vendor_class_identifier;
+ uint32_t mtu;
uint32_t xid;
usec_t start_time;
- uint16_t secs;
unsigned int attempt;
usec_t request_sent;
sd_event_source *timeout_t1;
uint32_t revents, void *userdata);
static int client_receive_message_udp(sd_event_source *s, int fd,
uint32_t revents, void *userdata);
-static sd_dhcp_client *client_stop(sd_dhcp_client *client, int error);
+static void client_stop(sd_dhcp_client *client, int error);
int sd_dhcp_client_set_callback(sd_dhcp_client *client, sd_dhcp_client_cb_t cb,
void *userdata) {
return 0;
}
+int sd_dhcp_client_set_request_broadcast(sd_dhcp_client *client, int broadcast) {
+ assert_return(client, -EINVAL);
+
+ client->request_broadcast = !!broadcast;
+
+ return 0;
+}
+
int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) {
size_t i;
assert_return(client, -EINVAL);
- assert_return (client->state == DHCP_STATE_INIT, -EBUSY);
+ assert_return (IN_SET(client->state, DHCP_STATE_INIT,
+ DHCP_STATE_STOPPED), -EBUSY);
switch(option) {
case DHCP_OPTION_PAD:
int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
const struct in_addr *last_addr) {
assert_return(client, -EINVAL);
- assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
+ assert_return (IN_SET(client->state, DHCP_STATE_INIT,
+ DHCP_STATE_STOPPED), -EBUSY);
if (last_addr)
client->last_addr = last_addr->s_addr;
int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index) {
assert_return(client, -EINVAL);
- assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
- assert_return(interface_index >= -1, -EINVAL);
+ assert_return (IN_SET(client->state, DHCP_STATE_INIT,
+ DHCP_STATE_STOPPED), -EBUSY);
+ assert_return(interface_index > 0, -EINVAL);
client->index = interface_index;
return 0;
}
-int sd_dhcp_client_set_mac(sd_dhcp_client *client,
- const struct ether_addr *addr) {
+int sd_dhcp_client_set_mac(sd_dhcp_client *client, const uint8_t *addr,
+ size_t addr_len, uint16_t arp_type) {
+ DHCP_CLIENT_DONT_DESTROY(client);
bool need_restart = false;
assert_return(client, -EINVAL);
assert_return(addr, -EINVAL);
+ assert_return(addr_len > 0 && addr_len <= MAX_MAC_ADDR_LEN, -EINVAL);
+ assert_return(arp_type > 0, -EINVAL);
+
+ if (arp_type == ARPHRD_ETHER)
+ assert_return(addr_len == ETH_ALEN, -EINVAL);
+ else if (arp_type == ARPHRD_INFINIBAND)
+ assert_return(addr_len == INFINIBAND_ALEN, -EINVAL);
+ else
+ return -EINVAL;
- if (memcmp(&client->client_id.mac_addr, addr, ETH_ALEN) == 0)
+ if (client->mac_addr_len == addr_len &&
+ memcmp(&client->mac_addr, addr, addr_len) == 0)
return 0;
- if (client->state != DHCP_STATE_INIT) {
+ if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) {
log_dhcp_client(client, "Changing MAC address on running DHCP "
"client, restarting");
need_restart = true;
- client = client_stop(client, DHCP_EVENT_STOP);
+ client_stop(client, DHCP_EVENT_STOP);
}
- if (!client)
+ memcpy(&client->mac_addr, addr, addr_len);
+ client->mac_addr_len = addr_len;
+ client->arp_type = arp_type;
+
+ if (need_restart && client->state != DHCP_STATE_STOPPED)
+ sd_dhcp_client_start(client);
+
+ return 0;
+}
+
+int sd_dhcp_client_get_client_id(sd_dhcp_client *client, uint8_t *type,
+ const uint8_t **data, size_t *data_len) {
+
+ assert_return(client, -EINVAL);
+ assert_return(type, -EINVAL);
+ assert_return(data, -EINVAL);
+ assert_return(data_len, -EINVAL);
+
+ *type = 0;
+ *data = NULL;
+ *data_len = 0;
+ if (client->client_id_len) {
+ *type = client->client_id.raw.type;
+ *data = client->client_id.raw.data;
+ *data_len = client->client_id_len -
+ sizeof (client->client_id.raw.type);
+ }
+
+ return 0;
+}
+
+int sd_dhcp_client_set_client_id(sd_dhcp_client *client, uint8_t type,
+ const uint8_t *data, size_t data_len) {
+ DHCP_CLIENT_DONT_DESTROY(client);
+ bool need_restart = false;
+
+ assert_return(client, -EINVAL);
+ assert_return(data, -EINVAL);
+ assert_return(data_len > 0 && data_len <= MAX_CLIENT_ID_LEN, -EINVAL);
+
+ switch (type) {
+ case ARPHRD_ETHER:
+ if (data_len != ETH_ALEN)
+ return -EINVAL;
+ break;
+ case ARPHRD_INFINIBAND:
+ if (data_len != INFINIBAND_ALEN)
+ return -EINVAL;
+ break;
+ default:
+ break;
+ }
+
+ if (client->client_id_len == data_len + sizeof (client->client_id.raw.type) &&
+ client->client_id.raw.type == type &&
+ memcmp(&client->client_id.raw.data, data, data_len) == 0)
return 0;
- memcpy(&client->client_id.mac_addr, addr, ETH_ALEN);
- client->client_id.type = 0x01;
+ if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) {
+ log_dhcp_client(client, "Changing client ID on running DHCP "
+ "client, restarting");
+ need_restart = true;
+ client_stop(client, DHCP_EVENT_STOP);
+ }
- if (need_restart)
+ client->client_id.raw.type = type;
+ memcpy(&client->client_id.raw.data, data, data_len);
+ client->client_id_len = data_len + sizeof (client->client_id.raw.type);
+
+ if (need_restart && client->state != DHCP_STATE_STOPPED)
sd_dhcp_client_start(client);
return 0;
}
+int sd_dhcp_client_set_hostname(sd_dhcp_client *client,
+ const char *hostname) {
+ char *new_hostname = NULL;
+
+ assert_return(client, -EINVAL);
+
+ if (streq_ptr(client->hostname, hostname))
+ return 0;
+
+ if (hostname) {
+ new_hostname = strdup(hostname);
+ if (!new_hostname)
+ return -ENOMEM;
+ }
+
+ free(client->hostname);
+ client->hostname = new_hostname;
+
+ return 0;
+}
+
+int sd_dhcp_client_set_vendor_class_identifier(sd_dhcp_client *client,
+ const char *vci) {
+ char *new_vci = NULL;
+
+ assert_return(client, -EINVAL);
+
+ new_vci = strdup(vci);
+ if (!new_vci)
+ return -ENOMEM;
+
+ free(client->vendor_class_identifier);
+
+ client->vendor_class_identifier = new_vci;
+
+ return 0;
+}
+
+int sd_dhcp_client_set_mtu(sd_dhcp_client *client, uint32_t mtu) {
+ assert_return(client, -EINVAL);
+ assert_return(mtu >= DHCP_DEFAULT_MIN_SIZE, -ERANGE);
+
+ client->mtu = mtu;
+
+ return 0;
+}
+
int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) {
assert_return(client, -EINVAL);
assert_return(ret, -EINVAL);
return 0;
}
-static sd_dhcp_client *client_notify(sd_dhcp_client *client, int event) {
- if (client->cb) {
- client = sd_dhcp_client_ref(client);
+static void client_notify(sd_dhcp_client *client, int event) {
+ if (client->cb)
client->cb(client, event, client->userdata);
- client = sd_dhcp_client_unref(client);
- }
-
- return client;
}
static int client_initialize(sd_dhcp_client *client) {
client->receive_message =
sd_event_source_unref(client->receive_message);
- client->fd = safe_close(client->fd);
+ client->fd = asynchronous_close(client->fd);
client->timeout_resend = sd_event_source_unref(client->timeout_resend);
return 0;
}
-static sd_dhcp_client *client_stop(sd_dhcp_client *client, int error) {
- assert_return(client, NULL);
-
- log_dhcp_client(client, "STOPPED %d", error);
+static void client_stop(sd_dhcp_client *client, int error) {
+ assert(client);
- client = client_notify(client, error);
+ if (error < 0)
+ log_dhcp_client(client, "STOPPED: %s", strerror(-error));
+ else if (error == DHCP_EVENT_STOP)
+ log_dhcp_client(client, "STOPPED");
+ else
+ log_dhcp_client(client, "STOPPED: Unknown event");
- if (client)
- client_initialize(client);
+ client_notify(client, error);
- return client;
+ client_initialize(client);
}
-static int client_message_init(sd_dhcp_client *client, DHCPMessage *message,
- uint8_t type, uint8_t **opt, size_t *optlen) {
+static int client_message_init(sd_dhcp_client *client, DHCPPacket **ret,
+ uint8_t type, size_t *_optlen, size_t *_optoffset) {
+ _cleanup_free_ DHCPPacket *packet;
+ size_t optlen, optoffset, size;
+ be16_t max_size;
+ usec_t time_now;
+ uint16_t secs;
int r;
assert(client);
- assert(client->secs);
- assert(message);
- assert(opt);
- assert(optlen);
+ assert(client->start_time);
+ assert(ret);
+ assert(_optlen);
+ assert(_optoffset);
+ assert(type == DHCP_DISCOVER || type == DHCP_REQUEST);
- r = dhcp_message_init(message, BOOTREQUEST, client->xid, type, opt,
- optlen);
+ optlen = DHCP_MIN_OPTIONS_SIZE;
+ size = sizeof(DHCPPacket) + optlen;
+
+ packet = malloc0(size);
+ if (!packet)
+ return -ENOMEM;
+
+ r = dhcp_message_init(&packet->dhcp, BOOTREQUEST, client->xid, type,
+ client->arp_type, optlen, &optoffset);
if (r < 0)
return r;
/* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
refuse to issue an DHCP lease if 'secs' is set to zero */
- message->secs = htobe16(client->secs);
-
- memcpy(&message->chaddr, &client->client_id.mac_addr, ETH_ALEN);
+ r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now);
+ if (r < 0)
+ return r;
+ assert(time_now >= client->start_time);
- if (client->state == DHCP_STATE_RENEWING ||
- client->state == DHCP_STATE_REBINDING)
- message->ciaddr = client->lease->address;
+ /* seconds between sending first and last DISCOVER
+ * must always be strictly positive to deal with broken servers */
+ secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1;
+ packet->dhcp.secs = htobe16(secs);
+
+ /* RFC2132 section 4.1
+ A client that cannot receive unicast IP datagrams until its protocol
+ software has been configured with an IP address SHOULD set the
+ BROADCAST bit in the 'flags' field to 1 in any DHCPDISCOVER or
+ DHCPREQUEST messages that client sends. The BROADCAST bit will
+ provide a hint to the DHCP server and BOOTP relay agent to broadcast
+ any messages to the client on the client's subnet.
+
+ Note: some interfaces needs this to be enabled, but some networks
+ needs this to be disabled as broadcasts are filteretd, so this
+ needs to be configurable */
+ if (client->request_broadcast || client->arp_type != ARPHRD_ETHER)
+ packet->dhcp.flags = htobe16(0x8000);
+
+ /* RFC2132 section 4.1.1:
+ The client MUST include its hardware address in the ’chaddr’ field, if
+ necessary for delivery of DHCP reply messages. Non-Ethernet
+ interfaces will leave 'chaddr' empty and use the client identifier
+ instead (eg, RFC 4390 section 2.1).
+ */
+ if (client->arp_type == ARPHRD_ETHER)
+ memcpy(&packet->dhcp.chaddr, &client->mac_addr, ETH_ALEN);
+
+ /* If no client identifier exists, construct one from an ethernet
+ address if present */
+ if (client->client_id_len == 0 && client->arp_type == ARPHRD_ETHER) {
+ client->client_id.eth.type = ARPHRD_ETHER;
+ memcpy(&client->client_id.eth.haddr, &client->mac_addr, ETH_ALEN);
+ client->client_id_len = sizeof (client->client_id.eth);
+ }
/* Some DHCP servers will refuse to issue an DHCP lease if the Client
Identifier option is not set */
- r = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER,
- sizeof(client->client_id), &client->client_id);
+ if (client->client_id_len) {
+ r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0,
+ DHCP_OPTION_CLIENT_IDENTIFIER,
+ client->client_id_len,
+ &client->client_id.raw);
+ if (r < 0)
+ return r;
+ }
+
+ /* RFC2131 section 3.5:
+ in its initial DHCPDISCOVER or DHCPREQUEST message, a
+ client may provide the server with a list of specific
+ parameters the client is interested in. If the client
+ includes a list of parameters in a DHCPDISCOVER message,
+ it MUST include that list in any subsequent DHCPREQUEST
+ messages.
+ */
+ r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0,
+ DHCP_OPTION_PARAMETER_REQUEST_LIST,
+ client->req_opts_size, client->req_opts);
if (r < 0)
return r;
- if (type == DHCP_DISCOVER || type == DHCP_REQUEST) {
- be16_t max_size;
-
- r = dhcp_option_append(opt, optlen,
- DHCP_OPTION_PARAMETER_REQUEST_LIST,
- client->req_opts_size,
- client->req_opts);
- if (r < 0)
- return r;
+ /* RFC2131 section 3.5:
+ The client SHOULD include the ’maximum DHCP message size’ option to
+ let the server know how large the server may make its DHCP messages.
+
+ Note (from ConnMan): Some DHCP servers will send bigger DHCP packets
+ than the defined default size unless the Maximum Messge Size option
+ is explicitely set
+
+ RFC3442 "Requirements to Avoid Sizing Constraints":
+ Because a full routing table can be quite large, the standard 576
+ octet maximum size for a DHCP message may be too short to contain
+ some legitimate Classless Static Route options. Because of this,
+ clients implementing the Classless Static Route option SHOULD send a
+ Maximum DHCP Message Size [4] option if the DHCP client's TCP/IP
+ stack is capable of receiving larger IP datagrams. In this case, the
+ client SHOULD set the value of this option to at least the MTU of the
+ interface that the client is configuring. The client MAY set the
+ value of this option higher, up to the size of the largest UDP packet
+ it is prepared to accept. (Note that the value specified in the
+ Maximum DHCP Message Size option is the total maximum packet size,
+ including IP and UDP headers.)
+ */
+ max_size = htobe16(size);
+ r = dhcp_option_append(&packet->dhcp, client->mtu, &optoffset, 0,
+ DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
+ 2, &max_size);
+ if (r < 0)
+ return r;
- /* Some DHCP servers will send bigger DHCP packets than the
- defined default size unless the Maximum Messge Size option
- is explicitely set */
- max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE +
- DHCP_MIN_OPTIONS_SIZE);
- r = dhcp_option_append(opt, optlen,
- DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
- 2, &max_size);
- if (r < 0)
- return r;
- }
+ *_optlen = optlen;
+ *_optoffset = optoffset;
+ *ret = packet;
+ packet = NULL;
return 0;
}
static int client_send_discover(sd_dhcp_client *client) {
_cleanup_free_ DHCPPacket *discover = NULL;
- size_t optlen, len;
- uint8_t *opt;
- usec_t time_now;
+ size_t optoffset, optlen;
int r;
assert(client);
+ assert(client->state == DHCP_STATE_INIT ||
+ client->state == DHCP_STATE_SELECTING);
- r = sd_event_now(client->event, CLOCK_MONOTONIC, &time_now);
+ r = client_message_init(client, &discover, DHCP_DISCOVER,
+ &optlen, &optoffset);
if (r < 0)
return r;
- assert(time_now >= client->start_time);
- /* seconds between sending first and last DISCOVER
- * must always be strictly positive to deal with broken servers */
- client->secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1;
-
- optlen = DHCP_MIN_OPTIONS_SIZE;
- len = sizeof(DHCPPacket) + optlen;
-
- discover = malloc0(len);
- if (!discover)
- return -ENOMEM;
+ /* the client may suggest values for the network address
+ and lease time in the DHCPDISCOVER message. The client may include
+ the ’requested IP address’ option to suggest that a particular IP
+ address be assigned, and may include the ’IP address lease time’
+ option to suggest the lease time it would like.
+ */
+ if (client->last_addr != INADDR_ANY) {
+ r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
+ DHCP_OPTION_REQUESTED_IP_ADDRESS,
+ 4, &client->last_addr);
+ if (r < 0)
+ return r;
+ }
- r = client_message_init(client, &discover->dhcp, DHCP_DISCOVER,
- &opt, &optlen);
- if (r < 0)
- return r;
+ /* it is unclear from RFC 2131 if client should send hostname in
+ DHCPDISCOVER but dhclient does and so we do as well
+ */
+ if (client->hostname) {
+ r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
+ DHCP_OPTION_HOST_NAME,
+ strlen(client->hostname), client->hostname);
+ if (r < 0)
+ return r;
+ }
- if (client->last_addr != INADDR_ANY) {
- r = dhcp_option_append(&opt, &optlen,
- DHCP_OPTION_REQUESTED_IP_ADDRESS,
- 4, &client->last_addr);
+ if (client->vendor_class_identifier) {
+ r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
+ DHCP_OPTION_VENDOR_CLASS_IDENTIFIER,
+ strlen(client->vendor_class_identifier),
+ client->vendor_class_identifier);
if (r < 0)
return r;
}
- r = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
+ r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
+ DHCP_OPTION_END, 0, NULL);
if (r < 0)
return r;
- r = dhcp_client_send_raw(client, discover, len - optlen);
+ /* We currently ignore:
+ The client SHOULD wait a random time between one and ten seconds to
+ desynchronize the use of DHCP at startup.
+ */
+ r = dhcp_client_send_raw(client, discover, sizeof(DHCPPacket) + optoffset);
if (r < 0)
return r;
}
static int client_send_request(sd_dhcp_client *client) {
- _cleanup_free_ DHCPPacket *request;
- size_t optlen, len;
- uint8_t *opt;
+ _cleanup_free_ DHCPPacket *request = NULL;
+ size_t optoffset, optlen;
int r;
- optlen = DHCP_MIN_OPTIONS_SIZE;
- len = sizeof(DHCPPacket) + optlen;
-
- request = malloc0(len);
- if (!request)
- return -ENOMEM;
-
- r = client_message_init(client, &request->dhcp, DHCP_REQUEST, &opt,
- &optlen);
+ r = client_message_init(client, &request, DHCP_REQUEST,
+ &optlen, &optoffset);
if (r < 0)
return r;
switch (client->state) {
+ /* See RFC2131 section 4.3.2 (note that there is a typo in the RFC,
+ SELECTING should be REQUESTING)
+ */
- case DHCP_STATE_INIT_REBOOT:
- r = dhcp_option_append(&opt, &optlen,
- DHCP_OPTION_REQUESTED_IP_ADDRESS,
- 4, &client->last_addr);
+ case DHCP_STATE_REQUESTING:
+ /* Client inserts the address of the selected server in ’server
+ identifier’, ’ciaddr’ MUST be zero, ’requested IP address’ MUST be
+ filled in with the yiaddr value from the chosen DHCPOFFER.
+ */
+
+ r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
+ DHCP_OPTION_SERVER_IDENTIFIER,
+ 4, &client->lease->server_address);
if (r < 0)
return r;
- break;
- case DHCP_STATE_REQUESTING:
- r = dhcp_option_append(&opt, &optlen,
+ r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
DHCP_OPTION_REQUESTED_IP_ADDRESS,
4, &client->lease->address);
if (r < 0)
return r;
- r = dhcp_option_append(&opt, &optlen,
- DHCP_OPTION_SERVER_IDENTIFIER,
- 4, &client->lease->server_address);
+ break;
+
+ case DHCP_STATE_INIT_REBOOT:
+ /* ’server identifier’ MUST NOT be filled in, ’requested IP address’
+ option MUST be filled in with client’s notion of its previously
+ assigned address. ’ciaddr’ MUST be zero.
+ */
+ r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
+ DHCP_OPTION_REQUESTED_IP_ADDRESS,
+ 4, &client->last_addr);
if (r < 0)
return r;
break;
+ case DHCP_STATE_RENEWING:
+ /* ’server identifier’ MUST NOT be filled in, ’requested IP address’
+ option MUST NOT be filled in, ’ciaddr’ MUST be filled in with
+ client’s IP address.
+ */
+
+ /* fall through */
+ case DHCP_STATE_REBINDING:
+ /* ’server identifier’ MUST NOT be filled in, ’requested IP address’
+ option MUST NOT be filled in, ’ciaddr’ MUST be filled in with
+ client’s IP address.
+
+ This message MUST be broadcast to the 0xffffffff IP broadcast address.
+ */
+ request->dhcp.ciaddr = client->lease->address;
+
+ break;
+
case DHCP_STATE_INIT:
case DHCP_STATE_SELECTING:
case DHCP_STATE_REBOOTING:
case DHCP_STATE_BOUND:
- case DHCP_STATE_RENEWING:
- case DHCP_STATE_REBINDING:
+ case DHCP_STATE_STOPPED:
+ return -EINVAL;
+ }
- break;
+ if (client->hostname) {
+ r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
+ DHCP_OPTION_HOST_NAME,
+ strlen(client->hostname), client->hostname);
+ if (r < 0)
+ return r;
}
- r = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
+ r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
+ DHCP_OPTION_END, 0, NULL);
if (r < 0)
return r;
client->lease->server_address,
DHCP_PORT_SERVER,
&request->dhcp,
- len - optlen - DHCP_IP_UDP_SIZE);
+ sizeof(DHCPMessage) + optoffset);
} else {
- r = dhcp_client_send_raw(client, request, len - optlen);
+ r = dhcp_client_send_raw(client, request, sizeof(DHCPPacket) + optoffset);
}
if (r < 0)
return r;
- log_dhcp_client(client, "REQUEST");
+ switch (client->state) {
+ case DHCP_STATE_REQUESTING:
+ log_dhcp_client(client, "REQUEST (requesting)");
+ break;
+ case DHCP_STATE_INIT_REBOOT:
+ log_dhcp_client(client, "REQUEST (init-reboot)");
+ break;
+ case DHCP_STATE_RENEWING:
+ log_dhcp_client(client, "REQUEST (renewing)");
+ break;
+ case DHCP_STATE_REBINDING:
+ log_dhcp_client(client, "REQUEST (rebinding)");
+ break;
+ default:
+ log_dhcp_client(client, "REQUEST (invalid)");
+ break;
+ }
return 0;
}
+static int client_start(sd_dhcp_client *client);
+
static int client_timeout_resend(sd_event_source *s, uint64_t usec,
void *userdata) {
sd_dhcp_client *client = userdata;
+ DHCP_CLIENT_DONT_DESTROY(client);
usec_t next_timeout = 0;
uint64_t time_now;
uint32_t time_left;
assert(client);
assert(client->event);
- r = sd_event_now(client->event, CLOCK_MONOTONIC, &time_now);
+ r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now);
if (r < 0)
goto error;
case DHCP_STATE_REBOOTING:
/* start over as we did not receive a timely ack or nak */
- client->state = DHCP_STATE_INIT;
- client->attempt = 1;
- client->xid = random_u32();
+ r = client_initialize(client);
+ if (r < 0)
+ goto error;
+
+ r = client_start(client);
+ if (r < 0)
+ goto error;
+ else {
+ log_dhcp_client(client, "REBOOTED");
+ return 0;
+ }
- /* fall through */
case DHCP_STATE_INIT:
case DHCP_STATE_INIT_REBOOT:
case DHCP_STATE_SELECTING:
next_timeout = time_now + (client->attempt - 1) * USEC_PER_SEC;
break;
+
+ case DHCP_STATE_STOPPED:
+ r = -EINVAL;
+ goto error;
}
next_timeout += (random_u32() & 0x1fffff);
r = sd_event_add_time(client->event,
&client->timeout_resend,
- CLOCK_MONOTONIC,
+ clock_boottime_or_monotonic(),
next_timeout, 10 * USEC_PER_MSEC,
client_timeout_resend, client);
if (r < 0)
if (r < 0)
goto error;
+ r = sd_event_source_set_description(client->timeout_resend, "dhcp4-resend-timer");
+ if (r < 0)
+ goto error;
+
switch (client->state) {
case DHCP_STATE_INIT:
r = client_send_discover(client);
case DHCP_STATE_BOUND:
break;
+
+ case DHCP_STATE_STOPPED:
+ r = -EINVAL;
+ goto error;
}
return 0;
return 0;
}
-static int client_initialize_events(sd_dhcp_client *client,
- sd_event_io_handler_t io_callback) {
+static int client_initialize_io_events(sd_dhcp_client *client,
+ sd_event_io_handler_t io_callback) {
int r;
assert(client);
if (r < 0)
goto error;
+ r = sd_event_source_set_description(client->receive_message, "dhcp4-receive-message");
+ if (r < 0)
+ goto error;
+
+error:
+ if (r < 0)
+ client_stop(client, r);
+
+ return 0;
+}
+
+static int client_initialize_time_events(sd_dhcp_client *client) {
+ int r;
+
+ assert(client);
+ assert(client->event);
+
client->timeout_resend = sd_event_source_unref(client->timeout_resend);
r = sd_event_add_time(client->event,
&client->timeout_resend,
- CLOCK_MONOTONIC,
+ clock_boottime_or_monotonic(),
0, 0,
client_timeout_resend, client);
if (r < 0)
r = sd_event_source_set_priority(client->timeout_resend,
client->event_priority);
+ r = sd_event_source_set_description(client->timeout_resend, "dhcp4-resend-timer");
+ if (r < 0)
+ goto error;
+
error:
if (r < 0)
client_stop(client, r);
}
+static int client_initialize_events(sd_dhcp_client *client,
+ sd_event_io_handler_t io_callback) {
+ client_initialize_io_events(client, io_callback);
+ client_initialize_time_events(client);
+
+ return 0;
+}
+
static int client_start(sd_dhcp_client *client) {
int r;
client->xid = random_u32();
- r = dhcp_network_bind_raw_socket(client->index, &client->link, client->xid);
-
+ r = dhcp_network_bind_raw_socket(client->index, &client->link,
+ client->xid, client->mac_addr,
+ client->mac_addr_len, client->arp_type);
if (r < 0) {
client_stop(client, r);
return r;
}
client->fd = r;
- if (client->state == DHCP_STATE_INIT) {
- client->start_time = now(CLOCK_MONOTONIC);
- client->secs = 0;
- }
-
- log_dhcp_client(client, "STARTED");
+ if (client->state == DHCP_STATE_INIT || client->state == DHCP_STATE_INIT_REBOOT)
+ client->start_time = now(clock_boottime_or_monotonic());
return client_initialize_events(client, client_receive_message_raw);
}
static int client_timeout_expire(sd_event_source *s, uint64_t usec,
void *userdata) {
sd_dhcp_client *client = userdata;
+ DHCP_CLIENT_DONT_DESTROY(client);
log_dhcp_client(client, "EXPIRED");
- client = client_notify(client, DHCP_EVENT_EXPIRED);
+ client_notify(client, DHCP_EVENT_EXPIRED);
- /* lease was lost, start over if not freed */
- if (client) {
+ /* lease was lost, start over if not freed or stopped in callback */
+ if (client->state != DHCP_STATE_STOPPED) {
client_initialize(client);
client_start(client);
}
static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) {
sd_dhcp_client *client = userdata;
+ DHCP_CLIENT_DONT_DESTROY(client);
int r;
client->receive_message = sd_event_source_unref(client->receive_message);
- client->fd = safe_close(client->fd);
+ client->fd = asynchronous_close(client->fd);
client->state = DHCP_STATE_REBINDING;
client->attempt = 1;
- r = dhcp_network_bind_raw_socket(client->index, &client->link, client->xid);
+ r = dhcp_network_bind_raw_socket(client->index, &client->link,
+ client->xid, client->mac_addr,
+ client->mac_addr_len, client->arp_type);
if (r < 0) {
client_stop(client, r);
return 0;
}
-
client->fd = r;
- log_dhcp_client(client, "TIMEOUT T2");
-
return client_initialize_events(client, client_receive_message_raw);
}
static int client_timeout_t1(sd_event_source *s, uint64_t usec,
void *userdata) {
sd_dhcp_client *client = userdata;
- int r;
+ DHCP_CLIENT_DONT_DESTROY(client);
client->state = DHCP_STATE_RENEWING;
client->attempt = 1;
- r = dhcp_network_bind_udp_socket(client->index,
- client->lease->address,
- DHCP_PORT_CLIENT);
- if (r < 0) {
- client_stop(client, r);
- return 0;
- }
-
- client->fd = r;
-
- log_dhcp_client(client, "TIMEOUT T1");
-
- return client_initialize_events(client, client_receive_message_udp);
+ return client_initialize_time_events(client);
}
static int client_handle_offer(sd_dhcp_client *client, DHCPMessage *offer,
if (r < 0)
return r;
+ if (client->client_id_len) {
+ r = dhcp_lease_set_client_id(lease,
+ (uint8_t *) &client->client_id.raw,
+ client->client_id_len);
+ if (r < 0)
+ return r;
+ }
+
r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease);
if (r != DHCP_OFFER) {
- log_dhcp_client(client, "receieved message was not an OFFER, ignoring");
+ log_dhcp_client(client, "received message was not an OFFER, ignoring");
return -ENOMSG;
}
if (lease->address == INADDR_ANY ||
lease->server_address == INADDR_ANY ||
lease->lifetime == 0) {
- log_dhcp_client(client, "receieved lease lacks address, server "
+ log_dhcp_client(client, "received lease lacks address, server "
"address or lease lifetime, ignoring");
return -ENOMSG;
}
if (lease->subnet_mask == INADDR_ANY) {
r = dhcp_lease_set_default_subnet_mask(lease);
if (r < 0) {
- log_dhcp_client(client, "receieved lease lacks subnet "
+ log_dhcp_client(client, "received lease lacks subnet "
"mask, and a fallback one can not be "
"generated, ignoring");
return -ENOMSG;
}
}
+ sd_dhcp_lease_unref(client->lease);
client->lease = lease;
lease = NULL;
return 0;
}
+static int client_handle_forcerenew(sd_dhcp_client *client, DHCPMessage *force,
+ size_t len) {
+ int r;
+
+ r = dhcp_option_parse(force, len, NULL, NULL);
+ if (r != DHCP_FORCERENEW)
+ return -ENOMSG;
+
+ log_dhcp_client(client, "FORCERENEW");
+
+ return 0;
+}
+
static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack,
size_t len) {
_cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
if (r < 0)
return r;
+ if (client->client_id_len) {
+ r = dhcp_lease_set_client_id(lease,
+ (uint8_t *) &client->client_id.raw,
+ client->client_id_len);
+ if (r < 0)
+ return r;
+ }
+
r = dhcp_option_parse(ack, len, dhcp_lease_parse_options, lease);
if (r == DHCP_NAK) {
log_dhcp_client(client, "NAK");
- return DHCP_EVENT_NO_LEASE;
+ return -EADDRNOTAVAIL;
}
if (r != DHCP_ACK) {
- log_dhcp_client(client, "receieved message was not an ACK, ignoring");
+ log_dhcp_client(client, "received message was not an ACK, ignoring");
return -ENOMSG;
}
if (lease->address == INADDR_ANY ||
lease->server_address == INADDR_ANY ||
lease->lifetime == 0) {
- log_dhcp_client(client, "receieved lease lacks address, server "
+ log_dhcp_client(client, "received lease lacks address, server "
"address or lease lifetime, ignoring");
return -ENOMSG;
}
if (lease->subnet_mask == INADDR_ANY) {
r = dhcp_lease_set_default_subnet_mask(lease);
if (r < 0) {
- log_dhcp_client(client, "receieved lease lacks subnet "
+ log_dhcp_client(client, "received lease lacks subnet "
"mask, and a fallback one can not be "
"generated, ignoring");
return -ENOMSG;
client->lease->subnet_mask != lease->subnet_mask ||
client->lease->router != lease->router) {
r = DHCP_EVENT_IP_CHANGE;
- }
+ } else
+ r = DHCP_EVENT_RENEW;
client->lease = sd_dhcp_lease_unref(client->lease);
}
if (client->lease->lifetime == 0xffffffff)
return 0;
- r = sd_event_now(client->event, CLOCK_MONOTONIC, &time_now);
+ r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now);
if (r < 0)
return r;
assert(client->request_sent <= time_now);
/* arm lifetime timeout */
r = sd_event_add_time(client->event, &client->timeout_expire,
- CLOCK_MONOTONIC,
+ clock_boottime_or_monotonic(),
lifetime_timeout, 10 * USEC_PER_MSEC,
client_timeout_expire, client);
if (r < 0)
if (r < 0)
return r;
+ r = sd_event_source_set_description(client->timeout_expire, "dhcp4-lifetime");
+ if (r < 0)
+ return r;
+
log_dhcp_client(client, "lease expires in %s",
format_timespan(time_string, FORMAT_TIMESPAN_MAX,
lifetime_timeout - time_now, 0));
/* arm T2 timeout */
r = sd_event_add_time(client->event,
&client->timeout_t2,
- CLOCK_MONOTONIC,
+ clock_boottime_or_monotonic(),
t2_timeout,
10 * USEC_PER_MSEC,
client_timeout_t2, client);
if (r < 0)
return r;
+ r = sd_event_source_set_description(client->timeout_t2, "dhcp4-t2-timeout");
+ if (r < 0)
+ return r;
+
log_dhcp_client(client, "T2 expires in %s",
format_timespan(time_string, FORMAT_TIMESPAN_MAX,
t2_timeout - time_now, 0));
/* arm T1 timeout */
r = sd_event_add_time(client->event,
&client->timeout_t1,
- CLOCK_MONOTONIC,
+ clock_boottime_or_monotonic(),
t1_timeout, 10 * USEC_PER_MSEC,
client_timeout_t1, client);
if (r < 0)
if (r < 0)
return r;
+ r = sd_event_source_set_description(client->timeout_t1, "dhcp4-t1-timer");
+ if (r < 0)
+ return r;
+
log_dhcp_client(client, "T1 expires in %s",
format_timespan(time_string, FORMAT_TIMESPAN_MAX,
t1_timeout - time_now, 0));
static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message,
int len) {
+ DHCP_CLIENT_DONT_DESTROY(client);
int r = 0, notify_event = 0;
assert(client);
assert(client->event);
assert(message);
- if (be32toh(message->magic) != DHCP_MAGIC_COOKIE) {
- log_dhcp_client(client, "not a DHCP message: ignoring");
- return 0;
- }
-
- if (message->op != BOOTREPLY) {
- log_dhcp_client(client, "not a BOOTREPLY message: ignoring");
- return 0;
- }
-
- if (be32toh(message->xid) != client->xid) {
- log_dhcp_client(client, "received xid (%u) does not match "
- "expected (%u): ignoring",
- be32toh(message->xid), client->xid);
- return 0;
- }
-
- if (message->htype != ARPHRD_ETHER || message->hlen != ETHER_ADDR_LEN) {
- log_dhcp_client(client, "not an ethernet packet");
- return 0;
- }
-
- if (memcmp(&message->chaddr[0], &client->client_id.mac_addr,
- ETH_ALEN)) {
- log_dhcp_client(client, "received chaddr does not match "
- "expected: ignoring");
- return 0;
- }
-
switch (client->state) {
case DHCP_STATE_SELECTING:
r = sd_event_add_time(client->event,
&client->timeout_resend,
- CLOCK_MONOTONIC,
+ clock_boottime_or_monotonic(),
0, 0,
client_timeout_resend, client);
if (r < 0)
client->event_priority);
if (r < 0)
goto error;
+
+ r = sd_event_source_set_description(client->timeout_resend, "dhcp4-resend-timer");
+ if (r < 0)
+ goto error;
} else if (r == -ENOMSG)
/* invalid message, let's ignore it */
return 0;
case DHCP_STATE_REBINDING:
r = client_handle_ack(client, message, len);
- if (r == DHCP_EVENT_NO_LEASE) {
-
- client->timeout_resend =
- sd_event_source_unref(client->timeout_resend);
-
- if (client->state == DHCP_STATE_REBOOTING) {
- r = client_initialize(client);
- if (r < 0)
- goto error;
-
- r = client_start(client);
- if (r < 0)
- goto error;
- }
-
- goto error;
- } else if (r >= 0) {
+ if (r >= 0) {
client->timeout_resend =
sd_event_source_unref(client->timeout_resend);
+ client->receive_message =
+ sd_event_source_unref(client->receive_message);
+ client->fd = asynchronous_close(client->fd);
if (IN_SET(client->state, DHCP_STATE_REQUESTING,
DHCP_STATE_REBOOTING))
client->last_addr = client->lease->address;
r = client_set_lease_timeouts(client);
- if (r < 0)
+ if (r < 0) {
+ log_dhcp_client(client, "could not set lease timeouts");
goto error;
+ }
+
+ r = dhcp_network_bind_udp_socket(client->lease->address,
+ DHCP_PORT_CLIENT);
+ if (r < 0) {
+ log_dhcp_client(client, "could not bind UDP socket");
+ goto error;
+ }
+
+ client->fd = r;
+
+ client_initialize_io_events(client, client_receive_message_udp);
if (notify_event) {
- client = client_notify(client, notify_event);
- if (!client)
+ client_notify(client, notify_event);
+ if (client->state == DHCP_STATE_STOPPED)
return 0;
}
- client->receive_message =
- sd_event_source_unref(client->receive_message);
- client->fd = safe_close(client->fd);
+ } else if (r == -EADDRNOTAVAIL) {
+ /* got a NAK, let's restart the client */
+ client->timeout_resend =
+ sd_event_source_unref(client->timeout_resend);
+
+ r = client_initialize(client);
+ if (r < 0)
+ goto error;
+
+ r = client_start(client);
+ if (r < 0)
+ goto error;
+
+ log_dhcp_client(client, "REBOOTED");
+
+ return 0;
+ } else if (r == -ENOMSG)
+ /* invalid message, let's ignore it */
+ return 0;
+
+ break;
+
+ case DHCP_STATE_BOUND:
+ r = client_handle_forcerenew(client, message, len);
+ if (r >= 0) {
+ r = client_timeout_t1(NULL, 0, client);
+ if (r < 0)
+ goto error;
} else if (r == -ENOMSG)
/* invalid message, let's ignore it */
return 0;
case DHCP_STATE_INIT:
case DHCP_STATE_INIT_REBOOT:
- case DHCP_STATE_BOUND:
break;
+
+ case DHCP_STATE_STOPPED:
+ r = -EINVAL;
+ goto error;
}
error:
- if (r < 0 || r == DHCP_EVENT_NO_LEASE)
+ if (r < 0)
client_stop(client, r);
return r;
sd_dhcp_client *client = userdata;
_cleanup_free_ DHCPMessage *message = NULL;
int buflen = 0, len, r;
+ const struct ether_addr zero_mac = { { 0, 0, 0, 0, 0, 0 } };
+ const struct ether_addr *expected_chaddr = NULL;
+ uint8_t expected_hlen = 0;
assert(s);
assert(client);
r = ioctl(fd, FIONREAD, &buflen);
- if (r < 0 || buflen <= 0)
- buflen = sizeof(DHCPMessage) + DHCP_MIN_OPTIONS_SIZE;
+ if (r < 0)
+ return r;
+
+ if (buflen < 0)
+ /* this can't be right */
+ return -EIO;
message = malloc0(buflen);
if (!message)
len = read(fd, message, buflen);
if (len < 0) {
log_dhcp_client(client, "could not receive message from UDP "
- "socket: %s", strerror(errno));
+ "socket: %m");
+ return 0;
+ } else if ((size_t)len < sizeof(DHCPMessage)) {
+ log_dhcp_client(client, "too small to be a DHCP message: ignoring");
return 0;
- } else if ((size_t)len < sizeof(DHCPMessage))
+ }
+
+ if (be32toh(message->magic) != DHCP_MAGIC_COOKIE) {
+ log_dhcp_client(client, "not a DHCP message: ignoring");
return 0;
+ }
+
+ if (message->op != BOOTREPLY) {
+ log_dhcp_client(client, "not a BOOTREPLY message: ignoring");
+ return 0;
+ }
+
+ if (message->htype != client->arp_type) {
+ log_dhcp_client(client, "packet type does not match client type");
+ return 0;
+ }
+
+ if (client->arp_type == ARPHRD_ETHER) {
+ expected_hlen = ETH_ALEN;
+ expected_chaddr = (const struct ether_addr *) &client->mac_addr;
+ } else {
+ /* Non-ethernet links expect zero chaddr */
+ expected_hlen = 0;
+ expected_chaddr = &zero_mac;
+ }
+
+ if (message->hlen != expected_hlen) {
+ log_dhcp_client(client, "unexpected packet hlen %d", message->hlen);
+ return 0;
+ }
+
+ if (memcmp(&message->chaddr[0], expected_chaddr, ETH_ALEN)) {
+ log_dhcp_client(client, "received chaddr does not match "
+ "expected: ignoring");
+ return 0;
+ }
+
+ if (client->state != DHCP_STATE_BOUND &&
+ be32toh(message->xid) != client->xid) {
+ /* in BOUND state, we may receive FORCERENEW with xid set by server,
+ so ignore the xid in this case */
+ log_dhcp_client(client, "received xid (%u) does not match "
+ "expected (%u): ignoring",
+ be32toh(message->xid), client->xid);
+ return 0;
+ }
return client_handle_message(client, message, len);
}
assert(client);
r = ioctl(fd, FIONREAD, &buflen);
- if (r < 0 || buflen <= 0)
- buflen = sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE;
+ if (r < 0)
+ return r;
+
+ if (buflen < 0)
+ /* this can't be right */
+ return -EIO;
packet = malloc0(buflen);
if (!packet)
len = recvmsg(fd, &msg, 0);
if (len < 0) {
log_dhcp_client(client, "could not receive message from raw "
- "socket: %s", strerror(errno));
+ "socket: %m");
return 0;
} else if ((size_t)len < sizeof(DHCPPacket))
return 0;
if (client->last_addr)
client->state = DHCP_STATE_INIT_REBOOT;
- return client_start(client);
+ r = client_start(client);
+ if (r >= 0)
+ log_dhcp_client(client, "STARTED on ifindex %u", client->index);
+
+ return r;
}
int sd_dhcp_client_stop(sd_dhcp_client *client) {
+ DHCP_CLIENT_DONT_DESTROY(client);
+
assert_return(client, -EINVAL);
client_stop(client, DHCP_EVENT_STOP);
+ client->state = DHCP_STATE_STOPPED;
return 0;
}
sd_dhcp_client *sd_dhcp_client_unref(sd_dhcp_client *client) {
if (client && REFCNT_DEC(client->n_ref) <= 0) {
- log_dhcp_client(client, "UNREF");
+ log_dhcp_client(client, "FREE");
client_initialize(client);
sd_dhcp_client_detach_event(client);
+ sd_dhcp_lease_unref(client->lease);
+
free(client->req_opts);
+ free(client->hostname);
+ free(client->vendor_class_identifier);
free(client);
-
- return NULL;
}
- return client;
+ return NULL;
}
-DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp_client*, sd_dhcp_client_unref);
-#define _cleanup_dhcp_client_free_ _cleanup_(sd_dhcp_client_unrefp)
-
int sd_dhcp_client_new(sd_dhcp_client **ret) {
- _cleanup_dhcp_client_free_ sd_dhcp_client *client = NULL;
+ _cleanup_dhcp_client_unref_ sd_dhcp_client *client = NULL;
assert_return(ret, -EINVAL);
client->index = -1;
client->fd = -1;
client->attempt = 1;
+ client->mtu = DHCP_DEFAULT_MIN_SIZE;
client->req_opts_size = ELEMENTSOF(default_req_opts);
~ianmdlvl / elogind.git / blobdiff