enet: Sync with upstream commit c44b7d0

https://github.com/lsalzman/enet/commit/c44b7d0f7ff21edb702745e4c019d0537928c373

thirdparty/README.md

@@ -194,7 +194,7 @@ commits.
 ## enet
 
 - Upstream: https://github.com/lsalzman/enet
-- Version: git (ea4607a90dbfbcf4da2669ea998585253d8e70b1, 2023)
+- Version: git (c44b7d0f7ff21edb702745e4c019d0537928c373, 2024)
 - License: MIT
 
 Files extracted from upstream source:

thirdparty/enet/patches/godot_socket.patch

@@ -1,5 +1,5 @@
 diff --git a/thirdparty/enet/enet/enet.h b/thirdparty/enet/enet/enet.h
-index fc45cbd0c9..77f8004b80 100644
+index 4a207041b3..5232f8a869 100644
 --- a/thirdparty/enet/enet/enet.h
 +++ b/thirdparty/enet/enet/enet.h
 @@ -10,13 +10,19 @@ extern "C"
@@ -22,7 +22,7 @@ index fc45cbd0c9..77f8004b80 100644
  
  #include "enet/types.h"
  #include "enet/protocol.h"
-@@ -86,11 +92,15 @@ typedef enum _ENetSocketShutdown
+@@ -87,11 +93,15 @@ typedef enum _ENetSocketShutdown
   * but not for enet_host_create.  Once a server responds to a broadcast, the
   * address is updated from ENET_HOST_BROADCAST to the server's actual IP address.
   */
@@ -38,7 +38,7 @@ index fc45cbd0c9..77f8004b80 100644
  
  /**
   * Packet flag bit constants.
-@@ -604,6 +614,10 @@ ENET_API size_t enet_range_coder_decompress (void *, const enet_uint8 *, size_t,
+@@ -608,6 +618,10 @@ ENET_API size_t enet_range_coder_decompress (void *, const enet_uint8 *, size_t,
     
  extern size_t enet_protocol_command_size (enet_uint8);
  
@@ -50,7 +50,7 @@ index fc45cbd0c9..77f8004b80 100644
  }
  #endif
 diff --git a/thirdparty/enet/host.c b/thirdparty/enet/host.c
-index 3b2180f7fd..21ab27e247 100644
+index fff946a392..adb3533cf1 100644
 --- a/thirdparty/enet/host.c
 +++ b/thirdparty/enet/host.c
 @@ -87,7 +87,7 @@ enet_host_create (const ENetAddress * address, size_t peerCount, size_t channelL
@@ -63,10 +63,10 @@ index 3b2180f7fd..21ab27e247 100644
      host -> receivedData = NULL;
      host -> receivedDataLength = 0;
 diff --git a/thirdparty/enet/protocol.c b/thirdparty/enet/protocol.c
-index 9d654f1d96..d7fe80f117 100644
+index 843a719af3..5f18700599 100644
 --- a/thirdparty/enet/protocol.c
 +++ b/thirdparty/enet/protocol.c
-@@ -309,7 +309,7 @@ enet_protocol_handle_connect (ENetHost * host, ENetProtocolHeader * header, ENet
+@@ -318,7 +318,7 @@ enet_protocol_handle_connect (ENetHost * host, ENetProtocolHeader * header, ENet
          }
          else 
          if (currentPeer -> state != ENET_PEER_STATE_CONNECTING &&
@@ -75,7 +75,7 @@ index 9d654f1d96..d7fe80f117 100644
          {
              if (currentPeer -> address.port == host -> receivedAddress.port &&
                  currentPeer -> connectID == command -> connect.connectID)
-@@ -1031,9 +1031,8 @@ enet_protocol_handle_incoming_commands (ENetHost * host, ENetEvent * event)
+@@ -1043,9 +1043,8 @@ enet_protocol_handle_incoming_commands (ENetHost * host, ENetEvent * event)
  
         if (peer -> state == ENET_PEER_STATE_DISCONNECTED ||
             peer -> state == ENET_PEER_STATE_ZOMBIE ||
@@ -87,7 +87,7 @@ index 9d654f1d96..d7fe80f117 100644
             (peer -> outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID &&
              sessionID != peer -> incomingSessionID))
           return 0;
-@@ -1075,7 +1074,7 @@ enet_protocol_handle_incoming_commands (ENetHost * host, ENetEvent * event)
+@@ -1090,7 +1089,7 @@ enet_protocol_handle_incoming_commands (ENetHost * host, ENetEvent * event)
         
      if (peer != NULL)
      {

thirdparty/enet/protocol.c

@@ -1071,11 +1071,14 @@ enet_protocol_handle_incoming_commands (ENetHost * host, ENetEvent * event)
 
     if (host -> checksum != NULL)
     {
-        enet_uint32 * checksum = (enet_uint32 *) & host -> receivedData [headerSize - sizeof (enet_uint32)],
-                    desiredChecksum = * checksum;
+        enet_uint32 * checksum = (enet_uint32 *) & host -> receivedData [headerSize - sizeof (enet_uint32)];
+        enet_uint32 desiredChecksum, newChecksum;
         ENetBuffer buffer;
+        /* Checksum may be an unaligned pointer, use memcpy to avoid undefined behaviour. */
+        memcpy (& desiredChecksum, checksum, sizeof (enet_uint32));
 
-        * checksum = peer != NULL ? peer -> connectID : 0;
+        newChecksum = peer != NULL ? peer -> connectID : 0;
+        memcpy (checksum, & newChecksum, sizeof (enet_uint32));
 
         buffer.data = host -> receivedData;
         buffer.dataLength = host -> receivedDataLength;
@@ -1703,9 +1706,12 @@ enet_protocol_send_outgoing_commands (ENetHost * host, ENetEvent * event, int ch
         if (host -> checksum != NULL)
         {
             enet_uint32 * checksum = (enet_uint32 *) & headerData [host -> buffers -> dataLength];
-            * checksum = currentPeer -> outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID ? currentPeer -> connectID : 0;
+            enet_uint32 newChecksum = currentPeer -> outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID ? currentPeer -> connectID : 0;
+            /* Checksum may be unaligned, use memcpy to avoid undefined behaviour. */
+            memcpy(checksum, & newChecksum, sizeof (enet_uint32));
             host -> buffers -> dataLength += sizeof (enet_uint32);
-            * checksum = host -> checksum (host -> buffers, host -> bufferCount);
+            newChecksum = host -> checksum (host -> buffers, host -> bufferCount);
+            memcpy(checksum, & newChecksum, sizeof (enet_uint32));
         }
 
         if (shouldCompress > 0)