#include "event-util.h"
#include "hostname-util.h"
#include "io-util.h"
+#include "memory-util.h"
#include "random-util.h"
#include "string-util.h"
#include "strv.h"
-#include "util.h"
#define MAX_CLIENT_ID_LEN (sizeof(uint32_t) + MAX_DUID_LEN) /* Arbitrary limit */
#define MAX_MAC_ADDR_LEN CONST_MAX(INFINIBAND_ALEN, ETH_ALEN)
uint32_t mtu;
uint32_t xid;
usec_t start_time;
- unsigned attempt;
+ uint64_t attempt;
+ uint64_t max_attempts;
usec_t request_sent;
sd_event_source *timeout_t1;
sd_event_source *timeout_t2;
*/
/* NOTE: using PRL options that Windows 10 RFC7844 implementation uses */
static const uint8_t default_req_opts_anonymize[] = {
- SD_DHCP_OPTION_SUBNET_MASK, /* 1 */
- SD_DHCP_OPTION_ROUTER, /* 3 */
- SD_DHCP_OPTION_DOMAIN_NAME_SERVER, /* 6 */
- SD_DHCP_OPTION_DOMAIN_NAME, /* 15 */
- SD_DHCP_OPTION_ROUTER_DISCOVER, /* 31 */
- SD_DHCP_OPTION_STATIC_ROUTE, /* 33 */
- SD_DHCP_OPTION_VENDOR_SPECIFIC, /* 43 */
- SD_DHCP_OPTION_NETBIOS_NAMESERVER, /* 44 */
- SD_DHCP_OPTION_NETBIOS_NODETYPE, /* 46 */
- SD_DHCP_OPTION_NETBIOS_SCOPE, /* 47 */
- SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE, /* 121 */
- SD_DHCP_OPTION_PRIVATE_CLASSLESS_STATIC_ROUTE, /* 249 */
- SD_DHCP_OPTION_PRIVATE_PROXY_AUTODISCOVERY, /* 252 */
+ SD_DHCP_OPTION_SUBNET_MASK, /* 1 */
+ SD_DHCP_OPTION_ROUTER, /* 3 */
+ SD_DHCP_OPTION_DOMAIN_NAME_SERVER, /* 6 */
+ SD_DHCP_OPTION_DOMAIN_NAME, /* 15 */
+ SD_DHCP_OPTION_ROUTER_DISCOVER, /* 31 */
+ SD_DHCP_OPTION_STATIC_ROUTE, /* 33 */
+ SD_DHCP_OPTION_VENDOR_SPECIFIC, /* 43 */
+ SD_DHCP_OPTION_NETBIOS_NAMESERVER, /* 44 */
+ SD_DHCP_OPTION_NETBIOS_NODETYPE, /* 46 */
+ SD_DHCP_OPTION_NETBIOS_SCOPE, /* 47 */
+ SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE, /* 121 */
+ SD_DHCP_OPTION_PRIVATE_CLASSLESS_STATIC_ROUTE, /* 249 */
+ SD_DHCP_OPTION_PRIVATE_PROXY_AUTODISCOVERY, /* 252 */
};
static int client_receive_message_raw(
size_t len;
assert_return(client, -EINVAL);
- assert_return(duid_len == 0 || duid != NULL, -EINVAL);
+ assert_return(duid_len == 0 || duid, -EINVAL);
- if (duid != NULL) {
- r = dhcp_validate_duid_len(duid_type, duid_len);
+ if (duid) {
+ r = dhcp_validate_duid_len(duid_type, duid_len, true);
if (r < 0)
return r;
}
}
}
- if (duid != NULL) {
+ if (duid) {
client->client_id.ns.duid.type = htobe16(duid_type);
memcpy(&client->client_id.ns.duid.raw.data, duid, duid_len);
len = sizeof(client->client_id.ns.duid.type) + duid_len;
return 0;
}
+int sd_dhcp_client_set_max_attempts(sd_dhcp_client *client, uint64_t max_attempts) {
+ assert_return(client, -EINVAL);
+
+ client->max_attempts = max_attempts;
+
+ return 0;
+}
+
int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) {
assert_return(client, -EINVAL);
- if (!IN_SET(client->state, DHCP_STATE_BOUND, DHCP_STATE_RENEWING, DHCP_STATE_REBINDING))
+ if (!IN_SET(client->state, DHCP_STATE_SELECTING, DHCP_STATE_BOUND, DHCP_STATE_RENEWING, DHCP_STATE_REBINDING))
return -EADDRNOTAVAIL;
if (ret)
return 0;
}
-static void client_notify(sd_dhcp_client *client, int event) {
+static int client_notify(sd_dhcp_client *client, int event) {
assert(client);
if (client->callback)
- client->callback(client, event, client->userdata);
+ return client->callback(client, event, client->userdata);
+
+ return 0;
}
static int client_initialize(sd_dhcp_client *client) {
(void) event_source_disable(client->timeout_t2);
(void) event_source_disable(client->timeout_expire);
- client->attempt = 1;
+ client->attempt = 0;
client->state = DHCP_STATE_INIT;
client->xid = 0;
assert(ret);
assert(_optlen);
assert(_optoffset);
- assert(IN_SET(type, DHCP_DISCOVER, DHCP_REQUEST));
+ assert(IN_SET(type, DHCP_DISCOVER, DHCP_REQUEST, DHCP_RELEASE));
optlen = DHCP_MIN_OPTIONS_SIZE;
size = sizeof(DHCPPacket) + optlen;
MAY contain the Parameter Request List option. */
/* NOTE: in case that there would be an option to do not send
* any PRL at all, the size should be checked before sending */
- if (client->req_opts_size > 0) {
+ if (client->req_opts_size > 0 && type != DHCP_RELEASE) {
r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0,
SD_DHCP_OPTION_PARAMETER_REQUEST_LIST,
client->req_opts_size, client->req_opts);
*/
/* RFC7844 section 3:
SHOULD NOT contain any other option. */
- if (!client->anonymize) {
+ if (!client->anonymize && type != DHCP_RELEASE) {
max_size = htobe16(size);
r = dhcp_option_append(&packet->dhcp, client->mtu, &optoffset, 0,
SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
return 0;
}
+static int client_send_release(sd_dhcp_client *client) {
+ _cleanup_free_ DHCPPacket *release = NULL;
+ size_t optoffset, optlen;
+ int r;
+
+ assert(client);
+ assert(!IN_SET(client->state, DHCP_STATE_STOPPED));
+
+ r = client_message_init(client, &release, DHCP_RELEASE,
+ &optlen, &optoffset);
+ if (r < 0)
+ return r;
+
+ /* Fill up release IP and MAC */
+ release->dhcp.ciaddr = client->lease->address;
+ memcpy(&release->dhcp.chaddr, &client->mac_addr, client->mac_addr_len);
+
+ r = dhcp_option_append(&release->dhcp, optlen, &optoffset, 0,
+ SD_DHCP_OPTION_END, 0, NULL);
+ if (r < 0)
+ return r;
+
+ r = dhcp_network_send_udp_socket(client->fd,
+ client->lease->server_address,
+ DHCP_PORT_SERVER,
+ &release->dhcp,
+ sizeof(DHCPMessage) + optoffset);
+ if (r < 0)
+ return r;
+
+ log_dhcp_client(client, "RELEASE");
+
+ return 0;
+}
+
static int client_send_request(sd_dhcp_client *client) {
_cleanup_free_ DHCPPacket *request = NULL;
size_t optoffset, optlen;
case DHCP_STATE_REQUESTING:
case DHCP_STATE_BOUND:
- if (client->attempt < 64)
- client->attempt *= 2;
+ if (client->attempt < client->max_attempts)
+ client->attempt++;
+ else
+ goto error;
- next_timeout = time_now + (client->attempt - 1) * USEC_PER_SEC;
+ next_timeout = time_now + ((UINT64_C(1) << MIN(client->attempt, (uint64_t) 6)) - 1) * USEC_PER_SEC;
break;
r = client_send_discover(client);
if (r >= 0) {
client->state = DHCP_STATE_SELECTING;
- client->attempt = 1;
- } else {
- if (client->attempt >= 64)
- goto error;
- }
+ client->attempt = 0;
+ } else if (client->attempt >= client->max_attempts)
+ goto error;
break;
case DHCP_STATE_SELECTING:
r = client_send_discover(client);
- if (r < 0 && client->attempt >= 64)
+ if (r < 0 && client->attempt >= client->max_attempts)
goto error;
break;
case DHCP_STATE_RENEWING:
case DHCP_STATE_REBINDING:
r = client_send_request(client);
- if (r < 0 && client->attempt >= 64)
+ if (r < 0 && client->attempt >= client->max_attempts)
goto error;
if (client->state == DHCP_STATE_INIT_REBOOT)
client->fd = asynchronous_close(client->fd);
client->state = DHCP_STATE_REBINDING;
- client->attempt = 1;
+ client->attempt = 0;
r = dhcp_network_bind_raw_socket(client->ifindex, &client->link,
client->xid, client->mac_addr,
DHCP_CLIENT_DONT_DESTROY(client);
client->state = DHCP_STATE_RENEWING;
- client->attempt = 1;
+ client->attempt = 0;
return client_initialize_time_events(client);
}
sd_dhcp_lease_unref(client->lease);
client->lease = TAKE_PTR(lease);
+ if (client_notify(client, SD_DHCP_CLIENT_EVENT_SELECTING) < 0)
+ return -ENOMSG;
+
log_dhcp_client(client, "OFFER");
return 0;
return 0;
}
+static bool lease_equal(const sd_dhcp_lease *a, const sd_dhcp_lease *b) {
+ if (a->address != b->address)
+ return false;
+
+ if (a->subnet_mask != b->subnet_mask)
+ return false;
+
+ if (a->router_size != b->router_size)
+ return false;
+
+ for (size_t i = 0; i < a->router_size; i++)
+ if (a->router[i].s_addr != b->router[i].s_addr)
+ return false;
+
+ return true;
+}
+
static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack, size_t len) {
_cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL;
_cleanup_free_ char *error_message = NULL;
r = SD_DHCP_CLIENT_EVENT_IP_ACQUIRE;
if (client->lease) {
- if (client->lease->address != lease->address ||
- client->lease->subnet_mask != lease->subnet_mask ||
- client->lease->router != lease->router) {
- r = SD_DHCP_CLIENT_EVENT_IP_CHANGE;
- } else
+ if (lease_equal(client->lease, lease))
r = SD_DHCP_CLIENT_EVENT_RENEW;
+ else
+ r = SD_DHCP_CLIENT_EVENT_IP_CHANGE;
client->lease = sd_dhcp_lease_unref(client->lease);
}
if (r >= 0) {
client->state = DHCP_STATE_REQUESTING;
- client->attempt = 1;
+ client->attempt = 0;
r = event_reset_time(client->event, &client->timeout_resend,
clock_boottime_or_monotonic(),
notify_event = r;
client->state = DHCP_STATE_BOUND;
- client->attempt = 1;
+ client->attempt = 0;
client->last_addr = client->lease->address;
sd_dhcp_client *client = userdata;
_cleanup_free_ DHCPMessage *message = NULL;
- const struct ether_addr zero_mac = {};
- const struct ether_addr *expected_chaddr = NULL;
+ const uint8_t *expected_chaddr = NULL;
uint8_t expected_hlen = 0;
ssize_t len, buflen;
assert(client);
buflen = next_datagram_size_fd(fd);
+ if (buflen == -ENETDOWN) {
+ /* the link is down. Don't return an error or the I/O event
+ source will be disconnected and we won't be able to receive
+ packets again when the link comes back. */
+ return 0;
+ }
if (buflen < 0)
return buflen;
len = recv(fd, message, buflen, 0);
if (len < 0) {
- if (IN_SET(errno, EAGAIN, EINTR))
+ /* see comment above for why we shouldn't error out on ENETDOWN. */
+ if (IN_SET(errno, EAGAIN, EINTR, ENETDOWN))
return 0;
return log_dhcp_client_errno(client, errno,
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;
+ expected_chaddr = &client->mac_addr[0];
}
if (message->hlen != expected_hlen) {
return 0;
}
- if (memcmp(&message->chaddr[0], expected_chaddr, ETH_ALEN)) {
+ if (expected_hlen > 0 && memcmp(&message->chaddr[0], expected_chaddr, expected_hlen)) {
log_dhcp_client(client, "Received chaddr does not match expected: ignoring");
return 0;
}
assert(client);
buflen = next_datagram_size_fd(fd);
+ if (buflen == -ENETDOWN)
+ return 0;
if (buflen < 0)
return buflen;
len = recvmsg(fd, &msg, 0);
if (len < 0) {
- if (IN_SET(errno, EAGAIN, EINTR))
+ if (IN_SET(errno, EAGAIN, EINTR, ENETDOWN))
return 0;
return log_dhcp_client_errno(client, errno,
} else if ((size_t)len < sizeof(DHCPPacket))
return 0;
- CMSG_FOREACH(cmsg, &msg) {
+ CMSG_FOREACH(cmsg, &msg)
if (cmsg->cmsg_level == SOL_PACKET &&
cmsg->cmsg_type == PACKET_AUXDATA &&
cmsg->cmsg_len == CMSG_LEN(sizeof(struct tpacket_auxdata))) {
checksum = !(aux->tp_status & TP_STATUS_CSUMNOTREADY);
break;
}
- }
r = dhcp_packet_verify_headers(packet, len, checksum, client->port);
if (r < 0)
return r;
}
+int sd_dhcp_client_send_release(sd_dhcp_client *client) {
+ assert_return(client, -EINVAL);
+
+ client_send_release(client);
+
+ return 0;
+}
+
int sd_dhcp_client_stop(sd_dhcp_client *client) {
DHCP_CLIENT_DONT_DESTROY(client);
.state = DHCP_STATE_INIT,
.ifindex = -1,
.fd = -1,
- .attempt = 1,
.mtu = DHCP_DEFAULT_MIN_SIZE,
.port = DHCP_PORT_CLIENT,
.anonymize = !!anonymize,
+ .max_attempts = (uint64_t) -1,
};
/* NOTE: this could be moved to a function. */
if (anonymize) {
projects / thirdparty / systemd.git / blobdiff