+/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
#include "dhcp6-internal.h"
#include "dhcp6-lease-internal.h"
#include "dhcp6-protocol.h"
+#include "dns-domain.h"
#include "fd-util.h"
+#include "hostname-util.h"
#include "in-addr-util.h"
#include "network-internal.h"
#include "random-util.h"
enum DHCP6State state;
sd_event *event;
int event_priority;
- int index;
+ int ifindex;
struct in6_addr local_address;
uint8_t mac_addr[MAX_MAC_ADDR_LEN];
size_t mac_addr_len;
be16_t *req_opts;
size_t req_opts_allocated;
size_t req_opts_len;
+ char *fqdn;
sd_event_source *receive_message;
usec_t retransmit_time;
uint8_t retransmit_count;
sd_event_source *timeout_resend;
sd_event_source *timeout_resend_expire;
- sd_dhcp6_client_cb_t cb;
+ sd_dhcp6_client_callback_t callback;
void *userdata;
struct duid duid;
size_t duid_len;
static int client_start(sd_dhcp6_client *client, enum DHCP6State state);
-int sd_dhcp6_client_set_callback(sd_dhcp6_client *client, sd_dhcp6_client_cb_t cb, void *userdata) {
+int sd_dhcp6_client_set_callback(
+ sd_dhcp6_client *client,
+ sd_dhcp6_client_callback_t cb,
+ void *userdata) {
+
assert_return(client, -EINVAL);
- client->cb = cb;
+ client->callback = cb;
client->userdata = userdata;
return 0;
}
-int sd_dhcp6_client_set_index(sd_dhcp6_client *client, int interface_index) {
- assert_return(client, -EINVAL);
- assert_return(interface_index >= -1, -EINVAL);
+int sd_dhcp6_client_set_ifindex(sd_dhcp6_client *client, int ifindex) {
+ assert_return(client, -EINVAL);
+ assert_return(ifindex >= -1, -EINVAL);
assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY);
- client->index = interface_index;
-
+ client->ifindex = ifindex;
return 0;
}
-int sd_dhcp6_client_set_local_address(sd_dhcp6_client *client, const struct in6_addr *local_address) {
+int sd_dhcp6_client_set_local_address(
+ sd_dhcp6_client *client,
+ const struct in6_addr *local_address) {
+
assert_return(client, -EINVAL);
assert_return(local_address, -EINVAL);
assert_return(in_addr_is_link_local(AF_INET6, (const union in_addr_union *) local_address) > 0, -EINVAL);
return dhcp_identifier_set_duid_en(&client->duid, &client->duid_len);
}
+/**
+ * Sets DUID. If duid is non-null, the DUID is set to duid_type + duid
+ * without further modification. Otherwise, if duid_type is supported, DUID
+ * is set based on that type. Otherwise, an error is returned.
+ */
int sd_dhcp6_client_set_duid(
sd_dhcp6_client *client,
- uint16_t type,
- uint8_t *duid, size_t duid_len) {
- assert_return(client, -EINVAL);
- assert_return(duid, -EINVAL);
- assert_return(duid_len > 0 && duid_len <= MAX_DUID_LEN, -EINVAL);
+ uint16_t duid_type,
+ const void *duid,
+ size_t duid_len) {
+ int r;
+ assert_return(client, -EINVAL);
+ assert_return(duid_len == 0 || duid != NULL, -EINVAL);
assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY);
- switch (type) {
- case DHCP6_DUID_LLT:
- if (duid_len <= sizeof(client->duid.llt))
- return -EINVAL;
- break;
- case DHCP6_DUID_EN:
- if (duid_len != sizeof(client->duid.en))
- return -EINVAL;
- break;
- case DHCP6_DUID_LL:
- if (duid_len <= sizeof(client->duid.ll))
- return -EINVAL;
- break;
- case DHCP6_DUID_UUID:
- if (duid_len != sizeof(client->duid.uuid))
- return -EINVAL;
- break;
- default:
- /* accept unknown type in order to be forward compatible */
- break;
+ if (duid != NULL) {
+ r = dhcp_validate_duid_len(duid_type, duid_len);
+ if (r < 0)
+ return r;
}
- client->duid.type = htobe16(type);
- memcpy(&client->duid.raw.data, duid, duid_len);
- client->duid_len = duid_len + sizeof(client->duid.type);
+ if (duid != NULL) {
+ client->duid.type = htobe16(duid_type);
+ memcpy(&client->duid.raw.data, duid, duid_len);
+ client->duid_len = sizeof(client->duid.type) + duid_len;
+ } else if (duid_type == DUID_TYPE_EN) {
+ r = dhcp_identifier_set_duid_en(&client->duid, &client->duid_len);
+ if (r < 0)
+ return r;
+ } else
+ return -EOPNOTSUPP;
return 0;
}
+int sd_dhcp6_client_set_iaid(sd_dhcp6_client *client, uint32_t iaid) {
+ assert_return(client, -EINVAL);
+ assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY);
+
+ client->ia_na.id = htobe32(iaid);
+
+ return 0;
+}
+
+int sd_dhcp6_client_set_fqdn(
+ sd_dhcp6_client *client,
+ const char *fqdn) {
+
+ assert_return(client, -EINVAL);
+
+ /* Make sure FQDN qualifies as DNS and as Linux hostname */
+ if (fqdn &&
+ !(hostname_is_valid(fqdn, false) && dns_name_is_valid(fqdn) > 0))
+ return -EINVAL;
+
+ return free_and_strdup(&client->fqdn, fqdn);
+}
+
int sd_dhcp6_client_set_information_request(sd_dhcp6_client *client, int enabled) {
assert_return(client, -EINVAL);
assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY);
assert_return(client->state == DHCP6_STATE_STOPPED, -EBUSY);
switch(option) {
+
case SD_DHCP6_OPTION_DNS_SERVERS:
case SD_DHCP6_OPTION_DOMAIN_LIST:
case SD_DHCP6_OPTION_SNTP_SERVERS:
}
static void client_notify(sd_dhcp6_client *client, int event) {
- if (client->cb)
- client->cb(client, event, client->userdata);
+ assert(client);
+
+ if (client->callback)
+ client->callback(client, event, client->userdata);
}
static void client_set_lease(sd_dhcp6_client *client, sd_dhcp6_lease *lease) {
+ assert(client);
+
if (client->lease) {
dhcp6_lease_clear_timers(&client->lease->ia);
sd_dhcp6_lease_unref(client->lease);
}
+
client->lease = lease;
}
static int client_reset(sd_dhcp6_client *client) {
- assert_return(client, -EINVAL);
+ assert(client);
client_set_lease(client, NULL);
usec_t elapsed_usec;
be16_t elapsed_time;
+ assert(client);
+
len = sizeof(DHCP6Message) + optlen;
message = malloc0(len);
if (r < 0)
return r;
+ if (client->fqdn) {
+ r = dhcp6_option_append_fqdn(&opt, &optlen, client->fqdn);
+ if (r < 0)
+ return r;
+ }
+
break;
case DHCP6_STATE_REQUEST:
if (r < 0)
return r;
+ if (client->fqdn) {
+ r = dhcp6_option_append_fqdn(&opt, &optlen, client->fqdn);
+ if (r < 0)
+ return r;
+ }
+
break;
case DHCP6_STATE_REBIND:
if (r < 0)
return r;
+ if (client->fqdn) {
+ r = dhcp6_option_append_fqdn(&opt, &optlen, client->fqdn);
+ if (r < 0)
+ return r;
+ }
+
break;
case DHCP6_STATE_STOPPED:
if (r < 0)
return r;
- assert (client->duid_len);
+ assert(client->duid_len);
r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_CLIENTID,
client->duid_len, &client->duid);
if (r < 0)
return 0;
}
-static int client_timeout_t2(sd_event_source *s, uint64_t usec,
- void *userdata) {
+static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) {
sd_dhcp6_client *client = userdata;
- assert_return(s, -EINVAL);
- assert_return(client, -EINVAL);
- assert_return(client->lease, -EINVAL);
+ assert(s);
+ assert(client);
+ assert(client->lease);
client->lease->ia.timeout_t2 =
sd_event_source_unref(client->lease->ia.timeout_t2);
return 0;
}
-static int client_timeout_t1(sd_event_source *s, uint64_t usec,
- void *userdata) {
+static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) {
sd_dhcp6_client *client = userdata;
- assert_return(s, -EINVAL);
- assert_return(client, -EINVAL);
- assert_return(client->lease, -EINVAL);
+ assert(s);
+ assert(client);
+ assert(client->lease);
client->lease->ia.timeout_t1 =
sd_event_source_unref(client->lease->ia.timeout_t1);
return 0;
}
-static int client_timeout_resend_expire(sd_event_source *s, uint64_t usec,
- void *userdata) {
+static int client_timeout_resend_expire(sd_event_source *s, uint64_t usec, void *userdata) {
sd_dhcp6_client *client = userdata;
DHCP6_CLIENT_DONT_DESTROY(client);
enum DHCP6State state;
(random_u32() % (2 * USEC_PER_SEC)) * val / 10 / USEC_PER_SEC;
}
-static int client_timeout_resend(sd_event_source *s, uint64_t usec,
- void *userdata) {
+static int client_timeout_resend(sd_event_source *s, uint64_t usec, void *userdata) {
int r = 0;
sd_dhcp6_client *client = userdata;
usec_t time_now, init_retransmit_time = 0, max_retransmit_time = 0;
if (client->ia_na.id)
return 0;
- r = dhcp_identifier_set_iaid(client->index, client->mac_addr, client->mac_addr_len, &client->ia_na.id);
+ r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, client->mac_addr_len, &client->ia_na.id);
if (r < 0)
return r;
return 0;
}
-static int client_parse_message(sd_dhcp6_client *client,
- DHCP6Message *message, size_t len,
- sd_dhcp6_lease *lease) {
+static int client_parse_message(
+ sd_dhcp6_client *client,
+ DHCP6Message *message,
+ size_t len,
+ sd_dhcp6_lease *lease) {
int r;
uint8_t *optval, *option, *id = NULL;
uint16_t optcode, status;
bool clientid = false;
be32_t iaid_lease;
+ assert(client);
+ assert(message);
+ assert(len >= sizeof(DHCP6Message));
+ assert(lease);
+
option = (uint8_t *)message + sizeof(DHCP6Message);
len -= sizeof(DHCP6Message);
}
static int client_receive_reply(sd_dhcp6_client *client, DHCP6Message *reply, size_t len) {
- int r;
_cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL;
bool rapid_commit;
+ int r;
+
+ assert(client);
+ assert(reply);
if (reply->type != DHCP6_REPLY)
return 0;
}
static int client_receive_advertise(sd_dhcp6_client *client, DHCP6Message *advertise, size_t len) {
- int r;
_cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL;
uint8_t pref_advertise = 0, pref_lease = 0;
+ int r;
if (advertise->type != DHCP6_ADVERTISE)
return 0;
return r;
}
-static int client_receive_message(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+static int client_receive_message(
+ sd_event_source *s,
+ int fd, uint32_t
+ revents,
+ void *userdata) {
+
sd_dhcp6_client *client = userdata;
DHCP6_CLIENT_DONT_DESTROY(client);
_cleanup_free_ DHCP6Message *message = NULL;
if (!message)
return -ENOMEM;
- len = read(fd, message, buflen);
+ len = recv(fd, message, buflen, 0);
if (len < 0) {
- if (errno == EAGAIN || errno == EINTR)
+ if (IN_SET(errno, EAGAIN, EINTR))
return 0;
- log_dhcp6_client(client, "Could not receive message from UDP socket: %m");
+ return log_dhcp6_client_errno(client, errno, "Could not receive message from UDP socket: %m");
- return -errno;
- } else if ((size_t)len < sizeof(DHCP6Message))
+ }
+ if ((size_t) len < sizeof(DHCP6Message)) {
+ log_dhcp6_client(client, "Too small to be DHCP6 message: ignoring");
return 0;
+ }
switch(message->type) {
case DHCP6_SOLICIT:
break;
default:
- log_dhcp6_client(client, "unknown message type %d",
- message->type);
+ log_dhcp6_client(client, "Unknown message type %d", message->type);
return 0;
}
break;
}
- /* fall through for Soliciation Rapid Commit option check */
+ /* fall through */ /* for Soliciation Rapid Commit option check */
case DHCP6_STATE_REQUEST:
case DHCP6_STATE_RENEW:
case DHCP6_STATE_REBIND:
return 0;
}
- if (r >= 0) {
+ if (r >= 0)
log_dhcp6_client(client, "Recv %s",
dhcp6_message_type_to_string(message->type));
- }
return 0;
}
assert_return(client, -EINVAL);
assert_return(client->event, -EINVAL);
- assert_return(client->index > 0, -EINVAL);
+ assert_return(client->ifindex > 0, -EINVAL);
assert_return(client->state != state, -EINVAL);
client->timeout_resend_expire =
if (client->lease->ia.lifetime_t1 == 0xffffffff ||
client->lease->ia.lifetime_t2 == 0xffffffff) {
- log_dhcp6_client(client, "infinite T1 0x%08x or T2 0x%08x",
+ log_dhcp6_client(client, "Infinite T1 0x%08x or T2 0x%08x",
be32toh(client->lease->ia.lifetime_t1),
be32toh(client->lease->ia.lifetime_t2));
}
int sd_dhcp6_client_start(sd_dhcp6_client *client) {
- int r = 0;
enum DHCP6State state = DHCP6_STATE_SOLICITATION;
+ int r = 0;
assert_return(client, -EINVAL);
assert_return(client->event, -EINVAL);
- assert_return(client->index > 0, -EINVAL);
+ assert_return(client->ifindex > 0, -EINVAL);
assert_return(in_addr_is_link_local(AF_INET6, (const union in_addr_union *) &client->local_address) > 0, -EINVAL);
if (!IN_SET(client->state, DHCP6_STATE_STOPPED))
if (r < 0)
return r;
- r = dhcp6_network_bind_udp_socket(client->index, &client->local_address);
- if (r < 0)
- return r;
+ r = dhcp6_network_bind_udp_socket(client->ifindex, &client->local_address);
+ if (r < 0) {
+ _cleanup_free_ char *p = NULL;
+
+ (void) in_addr_to_string(AF_INET6, (const union in_addr_union*) &client->local_address, &p);
+ return log_dhcp6_client_errno(client, r,
+ "Failed to bind to UDP socket at address %s: %m", strna(p));
+ }
client->fd = r;
goto error;
r = sd_event_source_set_description(client->receive_message,
- "dhcp6-receive-message");
+ "dhcp6-receive-message");
if (r < 0)
goto error;
state = DHCP6_STATE_INFORMATION_REQUEST;
log_dhcp6_client(client, "Started in %s mode",
- client->information_request? "Information request":
- "Managed");
+ client->information_request? "Information request":
+ "Managed");
return client_start(client, state);
return r;
}
-int sd_dhcp6_client_attach_event(sd_dhcp6_client *client, sd_event *event, int priority) {
+int sd_dhcp6_client_attach_event(sd_dhcp6_client *client, sd_event *event, int64_t priority) {
int r;
assert_return(client, -EINVAL);
}
sd_event *sd_dhcp6_client_get_event(sd_dhcp6_client *client) {
- if (!client)
- return NULL;
+ assert_return(client, NULL);
return client->event;
}
sd_dhcp6_client_detach_event(client);
free(client->req_opts);
- free(client);
-
- return NULL;
+ free(client->fqdn);
+ return mfree(client);
}
int sd_dhcp6_client_new(sd_dhcp6_client **ret) {
return -ENOMEM;
client->n_ref = 1;
-
client->ia_na.type = SD_DHCP6_OPTION_IA_NA;
-
- client->index = -1;
-
+ client->ifindex = -1;
client->fd = -1;
client->req_opts_len = ELEMENTSOF(default_req_opts);
-
client->req_opts = new0(be16_t, client->req_opts_len);
if (!client->req_opts)
return -ENOMEM;
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