#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)
*/
/* 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(
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.type) &&
client->client_id.type == type &&
memcmp(&client->client_id.raw.data, data, data_len) == 0)
return 0;
+ /* 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 client-id. The caller is advised to account for that. */
+ if ((type == ARPHRD_ETHER && data_len != ETH_ALEN) ||
+ (type == ARPHRD_INFINIBAND && data_len != 8))
+ log_dhcp_client(client, "Changing client ID to hardware type %u with "
+ "unexpected address length %zu",
+ type, data_len);
+
if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) {
log_dhcp_client(client, "Changing client ID on running DHCP "
"client, restarting");
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;
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)
projects / thirdparty / systemd.git / blobdiff