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-rw-r--r--src/libsystemd-network/sd-dhcp-client.c62
1 files changed, 32 insertions, 30 deletions
diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c
index e6225642eb..64c67b477c 100644
--- a/src/libsystemd-network/sd-dhcp-client.c
+++ b/src/libsystemd-network/sd-dhcp-client.c
@@ -1129,35 +1129,6 @@ static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message,
assert(client->event);
assert(message);
- if (be32toh(message->magic) != DHCP_MAGIC_COOKIE) {
- log_dhcp_client(client, "not a DHCP message: ignoring");
- return 0;
- }
-
- if (message->op != BOOTREPLY) {
- log_dhcp_client(client, "not a BOOTREPLY message: ignoring");
- return 0;
- }
-
- if (be32toh(message->xid) != client->xid) {
- log_dhcp_client(client, "received xid (%u) does not match "
- "expected (%u): ignoring",
- be32toh(message->xid), client->xid);
- return 0;
- }
-
- if (message->htype != ARPHRD_ETHER || message->hlen != ETHER_ADDR_LEN) {
- log_dhcp_client(client, "not an ethernet packet");
- return 0;
- }
-
- if (memcmp(&message->chaddr[0], &client->client_id.mac_addr,
- ETH_ALEN)) {
- log_dhcp_client(client, "received chaddr does not match "
- "expected: ignoring");
- return 0;
- }
-
switch (client->state) {
case DHCP_STATE_SELECTING:
@@ -1290,8 +1261,39 @@ static int client_receive_message_udp(sd_event_source *s, int fd,
log_dhcp_client(client, "could not receive message from UDP "
"socket: %m");
return 0;
- } else if ((size_t)len < sizeof(DHCPMessage))
+ } else if ((size_t)len < sizeof(DHCPMessage)) {
+ 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");
+ return 0;
+ }
+
+ if (message->op != BOOTREPLY) {
+ log_dhcp_client(client, "not a BOOTREPLY message: ignoring");
+ return 0;
+ }
+
+ if (be32toh(message->xid) != client->xid) {
+ log_dhcp_client(client, "received xid (%u) does not match "
+ "expected (%u): ignoring",
+ be32toh(message->xid), client->xid);
+ return 0;
+ }
+
+ if (message->htype != ARPHRD_ETHER || message->hlen != ETHER_ADDR_LEN) {
+ log_dhcp_client(client, "not an ethernet packet");
+ return 0;
+ }
+
+ if (memcmp(&message->chaddr[0], &client->client_id.mac_addr,
+ ETH_ALEN)) {
+ log_dhcp_client(client, "received chaddr does not match "
+ "expected: ignoring");
+ return 0;
+ }
return client_handle_message(client, message, len);
}