along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
-#include <stdlib.h>
#include <errno.h>
-#include <string.h>
-#include <stdio.h>
#include <net/ethernet.h>
#include <net/if_arp.h>
-#include <linux/if_infiniband.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
#include <sys/ioctl.h>
+#include <linux/if_infiniband.h>
-#include "util.h"
-#include "random-util.h"
-#include "async.h"
+#include "sd-dhcp-client.h"
-#include "dhcp-protocol.h"
+#include "alloc-util.h"
+#include "async.h"
+#include "dhcp-identifier.h"
#include "dhcp-internal.h"
#include "dhcp-lease-internal.h"
-#include "dhcp-identifier.h"
-#include "sd-dhcp-client.h"
+#include "dhcp-protocol.h"
+#include "dns-domain.h"
+#include "hostname-util.h"
+#include "random-util.h"
+#include "string-util.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)
DHCP_OPTION_HOST_NAME,
DHCP_OPTION_DOMAIN_NAME,
DHCP_OPTION_DOMAIN_NAME_SERVER,
- DHCP_OPTION_NTP_SERVER,
};
static int client_receive_message_raw(sd_event_source *s, int fd,
log_dhcp_client(client, "Changing MAC address on running DHCP "
"client, restarting");
need_restart = true;
- client_stop(client, DHCP_EVENT_STOP);
+ client_stop(client, SD_DHCP_CLIENT_EVENT_STOP);
}
memcpy(&client->mac_addr, addr, addr_len);
log_dhcp_client(client, "Changing client ID on running DHCP "
"client, restarting");
need_restart = true;
- client_stop(client, DHCP_EVENT_STOP);
+ client_stop(client, SD_DHCP_CLIENT_EVENT_STOP);
}
client->client_id.type = type;
assert_return(client, -EINVAL);
+ if (!hostname_is_valid(hostname, false) && !dns_name_is_valid(hostname))
+ return -EINVAL;
+
if (streq_ptr(client->hostname, hostname))
return 0;
if (error < 0)
log_dhcp_client(client, "STOPPED: %s", strerror(-error));
- else if (error == DHCP_EVENT_STOP)
+ else if (error == SD_DHCP_CLIENT_EVENT_STOP)
log_dhcp_client(client, "STOPPED");
else
log_dhcp_client(client, "STOPPED: Unknown event");
return 0;
}
+static int client_append_fqdn_option(DHCPMessage *message, size_t optlen, size_t *optoffset,
+ const char *fqdn) {
+ uint8_t buffer[3 + DHCP_MAX_FQDN_LENGTH];
+ int r;
+
+ buffer[0] = DHCP_FQDN_FLAG_S | /* Request server to perform A RR DNS updates */
+ DHCP_FQDN_FLAG_E; /* Canonical wire format */
+ buffer[1] = 0; /* RCODE1 (deprecated) */
+ buffer[2] = 0; /* RCODE2 (deprecated) */
+
+ r = dns_name_to_wire_format(fqdn, buffer + 3, sizeof(buffer) - 3);
+ if (r > 0)
+ r = dhcp_option_append(message, optlen, optoffset, 0,
+ DHCP_OPTION_FQDN, 3 + r, buffer);
+
+ return r;
+}
+
static int dhcp_client_send_raw(sd_dhcp_client *client, DHCPPacket *packet,
size_t len) {
dhcp_packet_append_ip_headers(packet, INADDR_ANY, DHCP_PORT_CLIENT,
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);
+ /* According to RFC 4702 "clients that send the Client FQDN option in
+ their messages MUST NOT also send the Host Name option". Just send
+ one of the two depending on the hostname type.
+ */
+ if (dns_name_is_single_label(client->hostname)) {
+ /* it is unclear from RFC 2131 if client should send hostname in
+ DHCPDISCOVER but dhclient does and so we do as well
+ */
+ r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
+ DHCP_OPTION_HOST_NAME,
+ strlen(client->hostname), client->hostname);
+ } else
+ r = client_append_fqdn_option(&discover->dhcp, optlen, &optoffset,
+ client->hostname);
if (r < 0)
return r;
}
}
if (client->hostname) {
- r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
- DHCP_OPTION_HOST_NAME,
- strlen(client->hostname), client->hostname);
+ if (dns_name_is_single_label(client->hostname))
+ r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
+ DHCP_OPTION_HOST_NAME,
+ strlen(client->hostname), client->hostname);
+ else
+ r = client_append_fqdn_option(&request->dhcp, optlen, &optoffset,
+ client->hostname);
if (r < 0)
return r;
}
log_dhcp_client(client, "EXPIRED");
- client_notify(client, DHCP_EVENT_EXPIRED);
+ client_notify(client, SD_DHCP_CLIENT_EVENT_EXPIRED);
/* lease was lost, start over if not freed or stopped in callback */
if (client->state != DHCP_STATE_STOPPED) {
return r;
}
- r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease);
+ r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease, NULL);
if (r != DHCP_OFFER) {
log_dhcp_client(client, "received message was not an OFFER, ignoring");
return -ENOMSG;
size_t len) {
int r;
- r = dhcp_option_parse(force, len, NULL, NULL);
+ r = dhcp_option_parse(force, len, NULL, NULL, NULL);
if (r != DHCP_FORCERENEW)
return -ENOMSG;
static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack,
size_t len) {
_cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
+ _cleanup_free_ char *error_message = NULL;
int r;
r = dhcp_lease_new(&lease);
return r;
}
- r = dhcp_option_parse(ack, len, dhcp_lease_parse_options, lease);
+ r = dhcp_option_parse(ack, len, dhcp_lease_parse_options, lease, &error_message);
if (r == DHCP_NAK) {
- log_dhcp_client(client, "NAK");
+ log_dhcp_client(client, "NAK: %s", strna(error_message));
return -EADDRNOTAVAIL;
}
}
}
- r = DHCP_EVENT_IP_ACQUIRE;
+ 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 = DHCP_EVENT_IP_CHANGE;
+ r = SD_DHCP_CLIENT_EVENT_IP_CHANGE;
} else
- r = DHCP_EVENT_RENEW;
+ r = SD_DHCP_CLIENT_EVENT_RENEW;
client->lease = sd_dhcp_lease_unref(client->lease);
}
return r;
}
-static uint64_t client_compute_timeout(sd_dhcp_client *client,
- uint32_t lifetime, double factor) {
+static uint64_t client_compute_timeout(sd_dhcp_client *client, uint32_t lifetime, double factor) {
assert(client);
assert(client->request_sent);
- assert(lifetime);
+ assert(lifetime > 0);
+
+ if (lifetime > 3)
+ lifetime -= 3;
+ else
+ lifetime = 0;
- return client->request_sent + ((lifetime - 3) * USEC_PER_SEC * factor) +
+ return client->request_sent + (lifetime * USEC_PER_SEC * factor) +
+ (random_u32() & 0x1fffff);
}
/* convert the various timeouts from relative (secs) to absolute (usecs) */
lifetime_timeout = client_compute_timeout(client, client->lease->lifetime, 1);
- if (client->lease->t1 && client->lease->t2) {
+ if (client->lease->t1 > 0 && client->lease->t2 > 0) {
/* both T1 and T2 are given */
if (client->lease->t1 < client->lease->t2 &&
client->lease->t2 < client->lease->lifetime) {
t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5);
client->lease->t1 = client->lease->lifetime / 2;
}
- } else if (client->lease->t2 && client->lease->t2 < client->lease->lifetime) {
+ } else if (client->lease->t2 > 0 && client->lease->t2 < client->lease->lifetime) {
/* only T2 is given, and it is valid */
t2_timeout = client_compute_timeout(client, client->lease->t2, 1);
t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5);
t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0);
client->lease->t2 = (client->lease->lifetime * 7) / 8;
}
- } else if (client->lease->t1 && client->lease->t1 < client->lease->lifetime) {
+ } else if (client->lease->t1 > 0 && client->lease->t1 < client->lease->lifetime) {
/* only T1 is given, and it is valid */
t1_timeout = client_compute_timeout(client, client->lease->t1, 1);
t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0);
return r;
log_dhcp_client(client, "lease expires in %s",
- format_timespan(time_string, FORMAT_TIMESPAN_MAX,
- lifetime_timeout - time_now, 0));
+ format_timespan(time_string, FORMAT_TIMESPAN_MAX, lifetime_timeout - time_now, USEC_PER_SEC));
/* don't arm earlier timeouts if this has already expired */
if (lifetime_timeout <= time_now)
return r;
log_dhcp_client(client, "T2 expires in %s",
- format_timespan(time_string, FORMAT_TIMESPAN_MAX,
- t2_timeout - time_now, 0));
+ format_timespan(time_string, FORMAT_TIMESPAN_MAX, t2_timeout - time_now, USEC_PER_SEC));
/* don't arm earlier timeout if this has already expired */
if (t2_timeout <= time_now)
return r;
log_dhcp_client(client, "T1 expires in %s",
- format_timespan(time_string, FORMAT_TIMESPAN_MAX,
- t1_timeout - time_now, 0));
+ format_timespan(time_string, FORMAT_TIMESPAN_MAX, t1_timeout - time_now, USEC_PER_SEC));
return 0;
}
if (IN_SET(client->state, DHCP_STATE_REQUESTING,
DHCP_STATE_REBOOTING))
- notify_event = DHCP_EVENT_IP_ACQUIRE;
- else if (r != DHCP_EVENT_IP_ACQUIRE)
+ notify_event = SD_DHCP_CLIENT_EVENT_IP_ACQUIRE;
+ else if (r != SD_DHCP_CLIENT_EVENT_IP_ACQUIRE)
notify_event = r;
client->state = DHCP_STATE_BOUND;
r = ioctl(fd, FIONREAD, &buflen);
if (r < 0)
- return r;
-
- if (buflen < 0)
+ return -errno;
+ else if (buflen < 0)
/* this can't be right */
return -EIO;
len = read(fd, message, buflen);
if (len < 0) {
- log_dhcp_client(client, "could not receive message from UDP "
- "socket: %m");
- return 0;
+ if (errno == EAGAIN || errno == EINTR)
+ return 0;
+
+ log_dhcp_client(client, "Could not receive message from UDP socket: %m");
+ return -errno;
} else if ((size_t)len < sizeof(DHCPMessage)) {
- log_dhcp_client(client, "too small to be a DHCP message: ignoring");
+ log_dhcp_client(client, "Too small to be a DHCP message: ignoring");
return 0;
}
if (be32toh(message->magic) != DHCP_MAGIC_COOKIE) {
- log_dhcp_client(client, "not a DHCP message: ignoring");
+ log_dhcp_client(client, "Not a DHCP message: ignoring");
return 0;
}
if (message->op != BOOTREPLY) {
- log_dhcp_client(client, "not a BOOTREPLY message: ignoring");
+ 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");
+ log_dhcp_client(client, "Packet type does not match client type");
return 0;
}
expected_hlen = ETH_ALEN;
expected_chaddr = (const struct ether_addr *) &client->mac_addr;
} else {
- /* Non-ethernet links expect zero chaddr */
+ /* 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);
+ 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");
+ log_dhcp_client(client, "Received chaddr does not match expected: ignoring");
return 0;
}
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",
+ log_dhcp_client(client, "Received xid (%u) does not match expected (%u): ignoring",
be32toh(message->xid), client->xid);
return 0;
}
r = ioctl(fd, FIONREAD, &buflen);
if (r < 0)
- return r;
-
- if (buflen < 0)
+ return -errno;
+ else if (buflen < 0)
/* this can't be right */
return -EIO;
len = recvmsg(fd, &msg, 0);
if (len < 0) {
- log_dhcp_client(client, "could not receive message from raw "
- "socket: %m");
- return 0;
+ if (errno == EAGAIN || errno == EINTR)
+ return 0;
+
+ log_dhcp_client(client, "Could not receive message from raw socket: %m");
+
+ return -errno;
} else if ((size_t)len < sizeof(DHCPPacket))
return 0;
assert_return(client, -EINVAL);
- client_stop(client, DHCP_EVENT_STOP);
+ client_stop(client, SD_DHCP_CLIENT_EVENT_STOP);
client->state = DHCP_STATE_STOPPED;
return 0;
projects / thirdparty / systemd.git / blobdiff