#include "random-util.h"
#include "string-util.h"
#include "strv.h"
+#include "utf8.h"
+#include "web-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)
#define RESTART_AFTER_NAK_MIN_USEC (1 * USEC_PER_SEC)
#define RESTART_AFTER_NAK_MAX_USEC (30 * USEC_PER_MINUTE)
+typedef struct sd_dhcp_client_id {
+ uint8_t type;
+ union {
+ struct {
+ /* 0: Generic (non-LL) (RFC 2132) */
+ uint8_t data[MAX_CLIENT_ID_LEN];
+ } _packed_ gen;
+ struct {
+ /* 1: Ethernet Link-Layer (RFC 2132) */
+ uint8_t haddr[ETH_ALEN];
+ } _packed_ eth;
+ struct {
+ /* 2 - 254: ARP/Link-Layer (RFC 2132) */
+ uint8_t haddr[0];
+ } _packed_ ll;
+ struct {
+ /* 255: Node-specific (RFC 4361) */
+ be32_t iaid;
+ struct duid duid;
+ } _packed_ ns;
+ struct {
+ uint8_t data[MAX_CLIENT_ID_LEN];
+ } _packed_ raw;
+ };
+} _packed_ sd_dhcp_client_id;
+
struct sd_dhcp_client {
unsigned n_ref;
uint8_t mac_addr[MAX_MAC_ADDR_LEN];
size_t mac_addr_len;
uint16_t arp_type;
- struct {
- uint8_t type;
- union {
- struct {
- /* 0: Generic (non-LL) (RFC 2132) */
- uint8_t data[MAX_CLIENT_ID_LEN];
- } _packed_ gen;
- struct {
- /* 1: Ethernet Link-Layer (RFC 2132) */
- uint8_t haddr[ETH_ALEN];
- } _packed_ eth;
- struct {
- /* 2 - 254: ARP/Link-Layer (RFC 2132) */
- uint8_t haddr[0];
- } _packed_ ll;
- struct {
- /* 255: Node-specific (RFC 4361) */
- be32_t iaid;
- struct duid duid;
- } _packed_ ns;
- struct {
- uint8_t data[MAX_CLIENT_ID_LEN];
- } _packed_ raw;
- };
- } _packed_ client_id;
+ sd_dhcp_client_id client_id;
size_t client_id_len;
char *hostname;
char *vendor_class_identifier;
+ char *mudurl;
char **user_class;
uint32_t mtu;
+ uint32_t fallback_lease_lifetime;
uint32_t xid;
usec_t start_time;
uint64_t attempt;
uint64_t max_attempts;
- OrderedHashmap *options;
+ OrderedHashmap *extra_options;
+ OrderedHashmap *vendor_options;
usec_t request_sent;
sd_event_source *timeout_t1;
sd_event_source *timeout_t2;
void *userdata);
static void client_stop(sd_dhcp_client *client, int error);
+int sd_dhcp_client_id_to_string(const void *data, size_t len, char **ret) {
+ const sd_dhcp_client_id *client_id = data;
+ _cleanup_free_ char *t = NULL;
+ int r = 0;
+
+ assert_return(data, -EINVAL);
+ assert_return(len >= 1, -EINVAL);
+ assert_return(ret, -EINVAL);
+
+ len -= 1;
+ if (len > MAX_CLIENT_ID_LEN)
+ return -EINVAL;
+
+ switch (client_id->type) {
+ case 0:
+ if (utf8_is_printable((char *) client_id->gen.data, len))
+ r = asprintf(&t, "%.*s", (int) len, client_id->gen.data);
+ else
+ r = asprintf(&t, "DATA");
+ break;
+ case 1:
+ if (len != sizeof_field(sd_dhcp_client_id, eth))
+ return -EINVAL;
+
+ r = asprintf(&t, "%x:%x:%x:%x:%x:%x",
+ client_id->eth.haddr[0],
+ client_id->eth.haddr[1],
+ client_id->eth.haddr[2],
+ client_id->eth.haddr[3],
+ client_id->eth.haddr[4],
+ client_id->eth.haddr[5]);
+ break;
+ case 2 ... 254:
+ r = asprintf(&t, "ARP/LL");
+ break;
+ case 255:
+ if (len < 6)
+ return -EINVAL;
+
+ uint32_t iaid = be32toh(client_id->ns.iaid);
+ uint16_t duid_type = be16toh(client_id->ns.duid.type);
+ if (dhcp_validate_duid_len(duid_type, len - 6, true) < 0)
+ return -EINVAL;
+
+ r = asprintf(&t, "IAID:0x%x/DUID", iaid);
+ break;
+ }
+
+ if (r < 0)
+ return -ENOMEM;
+ *ret = TAKE_PTR(t);
+ return 0;
+}
+
int sd_dhcp_client_set_callback(
sd_dhcp_client *client,
sd_dhcp_client_callback_t cb,
/* For hardware types, log debug message about unexpected data length.
*
* Note that infiniband's INFINIBAND_ALEN is 20 bytes long, but only
- * last last 8 bytes of the address are stable and suitable to put into
+ * the last 8 bytes of the address are stable and suitable to put into
* the client-id. The caller is advised to account for that. */
if ((type == ARPHRD_ETHER && data_len != ETH_ALEN) ||
(type == ARPHRD_INFINIBAND && data_len != 8))
return free_and_strdup(&client->vendor_class_identifier, vci);
}
+int sd_dhcp_client_set_mud_url(
+ sd_dhcp_client *client,
+ const char *mudurl) {
+
+ assert_return(client, -EINVAL);
+ assert_return(mudurl, -EINVAL);
+ assert_return(strlen(mudurl) <= 255, -EINVAL);
+ assert_return(http_url_is_valid(mudurl), -EINVAL);
+
+ return free_and_strdup(&client->mudurl, mudurl);
+}
+
int sd_dhcp_client_set_user_class(
sd_dhcp_client *client,
const char* const* user_class) {
return 0;
}
-int sd_dhcp_client_set_dhcp_option(sd_dhcp_client *client, sd_dhcp_option *v) {
+int sd_dhcp_client_add_option(sd_dhcp_client *client, sd_dhcp_option *v) {
int r;
assert_return(client, -EINVAL);
assert_return(v, -EINVAL);
- r = ordered_hashmap_ensure_allocated(&client->options, &dhcp_option_hash_ops);
+ r = ordered_hashmap_ensure_allocated(&client->extra_options, &dhcp_option_hash_ops);
if (r < 0)
return r;
- r = ordered_hashmap_put(client->options, UINT_TO_PTR(v->option), v);
+ r = ordered_hashmap_put(client->extra_options, UINT_TO_PTR(v->option), v);
if (r < 0)
return r;
return 0;
}
+int sd_dhcp_client_add_vendor_option(sd_dhcp_client *client, sd_dhcp_option *v) {
+ int r;
+
+ assert_return(client, -EINVAL);
+ assert_return(v, -EINVAL);
+
+ r = ordered_hashmap_ensure_allocated(&client->vendor_options, &dhcp_option_hash_ops);
+ if (r < 0)
+ return -ENOMEM;
+
+ r = ordered_hashmap_put(client->vendor_options, v, v);
+ if (r < 0)
+ return r;
+
+ sd_dhcp_option_ref(v);
+
+ return 1;
+}
+
int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) {
assert_return(client, -EINVAL);
return 0;
}
+int sd_dhcp_client_set_fallback_lease_lifetime(sd_dhcp_client *client, uint32_t fallback_lease_lifetime) {
+ assert_return(client, -EINVAL);
+ assert_return(fallback_lease_lifetime > 0, -EINVAL);
+
+ client->fallback_lease_lifetime = fallback_lease_lifetime;
+
+ return 0;
+}
+
static int client_notify(sd_dhcp_client *client, int event) {
assert(client);
packet, len);
}
-static int client_send_discover(sd_dhcp_client *client) {
- _cleanup_free_ DHCPPacket *discover = NULL;
- size_t optoffset, optlen;
+static int client_append_common_discover_request_options(sd_dhcp_client *client, DHCPPacket *packet, size_t *optoffset, size_t optlen) {
sd_dhcp_option *j;
Iterator i;
int r;
assert(client);
- assert(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_SELECTING));
-
- r = client_message_init(client, &discover, DHCP_DISCOVER,
- &optlen, &optoffset);
- if (r < 0)
- return r;
-
- /* 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.
- */
- /* RFC7844 section 3:
- SHOULD NOT contain any other option. */
- if (!client->anonymize && client->last_addr != INADDR_ANY) {
- r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
- SD_DHCP_OPTION_REQUESTED_IP_ADDRESS,
- 4, &client->last_addr);
- if (r < 0)
- return r;
- }
if (client->hostname) {
/* According to RFC 4702 "clients that send the Client FQDN option in
/* 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,
+ r = dhcp_option_append(&packet->dhcp, optlen, optoffset, 0,
SD_DHCP_OPTION_HOST_NAME,
strlen(client->hostname), client->hostname);
} else
- r = client_append_fqdn_option(&discover->dhcp, optlen, &optoffset,
+ r = client_append_fqdn_option(&packet->dhcp, optlen, optoffset,
client->hostname);
if (r < 0)
return r;
}
if (client->vendor_class_identifier) {
- r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
+ r = dhcp_option_append(&packet->dhcp, optlen, optoffset, 0,
SD_DHCP_OPTION_VENDOR_CLASS_IDENTIFIER,
strlen(client->vendor_class_identifier),
client->vendor_class_identifier);
return r;
}
+ if (client->mudurl) {
+ r = dhcp_option_append(&packet->dhcp, optlen, optoffset, 0,
+ SD_DHCP_OPTION_MUD_URL,
+ strlen(client->mudurl),
+ client->mudurl);
+ if (r < 0)
+ return r;
+ }
+
if (client->user_class) {
- r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
+ r = dhcp_option_append(&packet->dhcp, optlen, optoffset, 0,
SD_DHCP_OPTION_USER_CLASS,
strv_length(client->user_class),
client->user_class);
return r;
}
- ORDERED_HASHMAP_FOREACH(j, client->options, i) {
- r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
+ ORDERED_HASHMAP_FOREACH(j, client->extra_options, i) {
+ r = dhcp_option_append(&packet->dhcp, optlen, optoffset, 0,
j->option, j->length, j->data);
if (r < 0)
return r;
}
+ if (!ordered_hashmap_isempty(client->vendor_options)) {
+ r = dhcp_option_append(
+ &packet->dhcp, optlen, optoffset, 0,
+ SD_DHCP_OPTION_VENDOR_SPECIFIC,
+ ordered_hashmap_size(client->vendor_options), client->vendor_options);
+ if (r < 0)
+ return r;
+ }
+
+
+ return 0;
+}
+
+static int client_send_discover(sd_dhcp_client *client) {
+ _cleanup_free_ DHCPPacket *discover = NULL;
+ size_t optoffset, optlen;
+ int r;
+
+ assert(client);
+ assert(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_SELECTING));
+
+ r = client_message_init(client, &discover, DHCP_DISCOVER,
+ &optlen, &optoffset);
+ if (r < 0)
+ return r;
+
+ /* 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.
+ */
+ /* RFC7844 section 3:
+ SHOULD NOT contain any other option. */
+ if (!client->anonymize && client->last_addr != INADDR_ANY) {
+ r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
+ SD_DHCP_OPTION_REQUESTED_IP_ADDRESS,
+ 4, &client->last_addr);
+ if (r < 0)
+ return r;
+ }
+
+ r = client_append_common_discover_request_options(client, discover, &optoffset, optlen);
+ if (r < 0)
+ return r;
+
r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
SD_DHCP_OPTION_END, 0, NULL);
if (r < 0)
return -EINVAL;
}
- if (client->hostname) {
- if (dns_name_is_single_label(client->hostname))
- r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
- SD_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;
- }
-
- if (client->vendor_class_identifier) {
- r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
- SD_DHCP_OPTION_VENDOR_CLASS_IDENTIFIER,
- strlen(client->vendor_class_identifier),
- client->vendor_class_identifier);
- if (r < 0)
- return r;
- }
+ r = client_append_common_discover_request_options(client, request, &optoffset, optlen);
+ if (r < 0)
+ return r;
r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
SD_DHCP_OPTION_END, 0, NULL);
sd_dhcp_client *client = userdata;
DHCP_CLIENT_DONT_DESTROY(client);
- client->state = DHCP_STATE_RENEWING;
+ if (client->lease)
+ client->state = DHCP_STATE_RENEWING;
+ else if (client->state != DHCP_STATE_INIT)
+ client->state = DHCP_STATE_INIT_REBOOT;
client->attempt = 0;
return client_initialize_time_events(client);
lease->next_server = offer->siaddr;
lease->address = offer->yiaddr;
+ if (lease->lifetime == 0 && client->fallback_lease_lifetime > 0)
+ lease->lifetime = client->fallback_lease_lifetime;
+
if (lease->address == 0 ||
lease->server_address == 0 ||
lease->lifetime == 0) {
sd_dhcp_client *client = userdata;
_cleanup_free_ DHCPPacket *packet = NULL;
- uint8_t cmsgbuf[CMSG_LEN(sizeof(struct tpacket_auxdata))];
+ CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct tpacket_auxdata))) control;
struct iovec iov = {};
struct msghdr msg = {
.msg_iov = &iov,
.msg_iovlen = 1,
- .msg_control = cmsgbuf,
- .msg_controllen = sizeof(cmsgbuf),
+ .msg_control = &control,
+ .msg_controllen = sizeof(control),
};
struct cmsghdr *cmsg;
bool checksum = true;
iov = IOVEC_MAKE(packet, buflen);
- len = recvmsg(fd, &msg, 0);
- if (len < 0) {
- if (IN_SET(errno, EAGAIN, EINTR, ENETDOWN))
- return 0;
-
- return log_dhcp_client_errno(client, errno,
- "Could not receive message from raw socket: %m");
- } else if ((size_t)len < sizeof(DHCPPacket))
+ len = recvmsg_safe(fd, &msg, 0);
+ if (IN_SET(len, -EAGAIN, -EINTR, -ENETDOWN))
return 0;
+ if (len < 0)
+ return log_dhcp_client_errno(client, len,
+ "Could not receive message from raw socket: %m");
- CMSG_FOREACH(cmsg, &msg)
- if (cmsg->cmsg_level == SOL_PACKET &&
- cmsg->cmsg_type == PACKET_AUXDATA &&
- cmsg->cmsg_len == CMSG_LEN(sizeof(struct tpacket_auxdata))) {
- struct tpacket_auxdata *aux = (struct tpacket_auxdata*)CMSG_DATA(cmsg);
+ if ((size_t) len < sizeof(DHCPPacket))
+ return 0;
- checksum = !(aux->tp_status & TP_STATUS_CSUMNOTREADY);
- break;
- }
+ cmsg = cmsg_find(&msg, SOL_PACKET, PACKET_AUXDATA, CMSG_LEN(sizeof(struct tpacket_auxdata)));
+ if (cmsg) {
+ struct tpacket_auxdata *aux = (struct tpacket_auxdata*) CMSG_DATA(cmsg);
+ checksum = !(aux->tp_status & TP_STATUS_CSUMNOTREADY);
+ }
r = dhcp_packet_verify_headers(packet, len, checksum, client->port);
if (r < 0)
assert_return(client, -EINVAL);
assert_return(client->fd >= 0, -EINVAL);
+ if (!client->lease)
+ return 0;
+
client->start_delay = 0;
client->attempt = 1;
client->state = DHCP_STATE_RENEWING;
free(client->req_opts);
free(client->hostname);
free(client->vendor_class_identifier);
+ free(client->mudurl);
client->user_class = strv_free(client->user_class);
- ordered_hashmap_free(client->options);
+ ordered_hashmap_free(client->extra_options);
+ ordered_hashmap_free(client->vendor_options);
return mfree(client);
}
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