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[3.x] [Net/ENet] Better handle truncated socket messages #79704

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Aug 2, 2023
Merged

[3.x] [Net/ENet] Better handle truncated socket messages #79704

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c783dd4
[Net] Explicitly handle buffer errors in send/recv
Faless Jul 19, 2023
6aedce4
[ENet] Update to upstream master.
Faless Jul 19, 2023
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18 changes: 18 additions & 0 deletions drivers/unix/net_socket_posix.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -195,6 +195,9 @@ NetSocketPosix::NetError NetSocketPosix::_get_socket_error() const {
return ERR_NET_IN_PROGRESS;
if (err == WSAEWOULDBLOCK)
return ERR_NET_WOULD_BLOCK;
if (err == WSAEMSGSIZE || err == WSAENOBUFS) {
return ERR_NET_BUFFER_TOO_SMALL;
}
print_verbose("Socket error: " + itos(err));
return ERR_NET_OTHER;
#else
Expand All @@ -207,6 +210,9 @@ NetSocketPosix::NetError NetSocketPosix::_get_socket_error() const {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
return ERR_NET_WOULD_BLOCK;
}
if (errno == ENOBUFS) {
return ERR_NET_BUFFER_TOO_SMALL;
}
print_verbose("Socket error: " + itos(errno));
return ERR_NET_OTHER;
#endif
Expand Down Expand Up @@ -535,6 +541,9 @@ Error NetSocketPosix::recv(uint8_t *p_buffer, int p_len, int &r_read) {
if (err == ERR_NET_WOULD_BLOCK) {
return ERR_BUSY;
}
if (err == ERR_NET_BUFFER_TOO_SMALL) {
return ERR_OUT_OF_MEMORY;
}

return FAILED;
}
Expand All @@ -556,6 +565,9 @@ Error NetSocketPosix::recvfrom(uint8_t *p_buffer, int p_len, int &r_read, IP_Add
if (err == ERR_NET_WOULD_BLOCK) {
return ERR_BUSY;
}
if (err == ERR_NET_BUFFER_TOO_SMALL) {
return ERR_OUT_OF_MEMORY;
}

return FAILED;
}
Expand Down Expand Up @@ -592,6 +604,9 @@ Error NetSocketPosix::send(const uint8_t *p_buffer, int p_len, int &r_sent) {
if (err == ERR_NET_WOULD_BLOCK) {
return ERR_BUSY;
}
if (err == ERR_NET_BUFFER_TOO_SMALL) {
return ERR_OUT_OF_MEMORY;
}

return FAILED;
}
Expand All @@ -611,6 +626,9 @@ Error NetSocketPosix::sendto(const uint8_t *p_buffer, int p_len, int &r_sent, IP
if (err == ERR_NET_WOULD_BLOCK) {
return ERR_BUSY;
}
if (err == ERR_NET_BUFFER_TOO_SMALL) {
return ERR_OUT_OF_MEMORY;
}

return FAILED;
}
Expand Down
1 change: 1 addition & 0 deletions drivers/unix/net_socket_posix.h
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Original file line number Diff line number Diff line change
Expand Up @@ -54,6 +54,7 @@ class NetSocketPosix : public NetSocket {
ERR_NET_WOULD_BLOCK,
ERR_NET_IS_CONNECTED,
ERR_NET_IN_PROGRESS,
ERR_NET_BUFFER_TOO_SMALL,
ERR_NET_OTHER
};

Expand Down
2 changes: 1 addition & 1 deletion thirdparty/README.md
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Expand Up @@ -71,7 +71,7 @@ commits.
## enet

- Upstream: http://enet.bespin.org
- Version: 1.3.17 (e0e7045b7e056b454b5093cb34df49dc4cee0bee, 2020)
- Version: git (ea4607a90dbfbcf4da2669ea998585253d8e70b1, 2023)
- License: MIT

Files extracted from upstream source:
Expand Down
16 changes: 10 additions & 6 deletions thirdparty/enet/enet/enet.h
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Original file line number Diff line number Diff line change
Expand Up @@ -68,7 +68,8 @@ typedef enum _ENetSocketOption
ENET_SOCKOPT_RCVTIMEO = 6,
ENET_SOCKOPT_SNDTIMEO = 7,
ENET_SOCKOPT_ERROR = 8,
ENET_SOCKOPT_NODELAY = 9
ENET_SOCKOPT_NODELAY = 9,
ENET_SOCKOPT_TTL = 10
} ENetSocketOption;

typedef enum _ENetSocketShutdown
Expand Down Expand Up @@ -179,7 +180,7 @@ typedef struct _ENetOutgoingCommand
enet_uint16 unreliableSequenceNumber;
enet_uint32 sentTime;
enet_uint32 roundTripTimeout;
enet_uint32 roundTripTimeoutLimit;
enet_uint32 queueTime;
enet_uint32 fragmentOffset;
enet_uint16 fragmentLength;
enet_uint16 sendAttempts;
Expand Down Expand Up @@ -222,7 +223,7 @@ enum
ENET_HOST_RECEIVE_BUFFER_SIZE = 256 * 1024,
ENET_HOST_SEND_BUFFER_SIZE = 256 * 1024,
ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL = 1000,
ENET_HOST_DEFAULT_MTU = 1400,
ENET_HOST_DEFAULT_MTU = 1392,
ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE = 32 * 1024 * 1024,
ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,

Expand Down Expand Up @@ -262,7 +263,8 @@ typedef struct _ENetChannel

typedef enum _ENetPeerFlag
{
ENET_PEER_FLAG_NEEDS_DISPATCH = (1 << 0)
ENET_PEER_FLAG_NEEDS_DISPATCH = (1 << 0),
ENET_PEER_FLAG_CONTINUE_SENDING = (1 << 1)
} ENetPeerFlag;

/**
Expand Down Expand Up @@ -322,7 +324,7 @@ typedef struct _ENetPeer
enet_uint16 outgoingReliableSequenceNumber;
ENetList acknowledgements;
ENetList sentReliableCommands;
ENetList sentUnreliableCommands;
ENetList outgoingSendReliableCommands;
ENetList outgoingCommands;
ENetList dispatchedCommands;
enet_uint16 flags;
Expand Down Expand Up @@ -385,7 +387,7 @@ typedef struct _ENetHost
size_t channelLimit; /**< maximum number of channels allowed for connected peers */
enet_uint32 serviceTime;
ENetList dispatchQueue;
int continueSending;
enet_uint32 totalQueued;
size_t packetSize;
enet_uint16 headerFlags;
ENetProtocol commands [ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS];
Expand Down Expand Up @@ -585,6 +587,7 @@ ENET_API void enet_host_channel_limit (ENetHost *, size_t);
ENET_API void enet_host_bandwidth_limit (ENetHost *, enet_uint32, enet_uint32);
extern void enet_host_bandwidth_throttle (ENetHost *);
extern enet_uint32 enet_host_random_seed (void);
extern enet_uint32 enet_host_random (ENetHost *);

ENET_API int enet_peer_send (ENetPeer *, enet_uint8, ENetPacket *);
ENET_API ENetPacket * enet_peer_receive (ENetPeer *, enet_uint8 * channelID);
Expand All @@ -598,6 +601,7 @@ ENET_API void enet_peer_disconnect_later (ENetPeer *, enet_uint32
ENET_API void enet_peer_throttle_configure (ENetPeer *, enet_uint32, enet_uint32, enet_uint32);
extern int enet_peer_throttle (ENetPeer *, enet_uint32);
extern void enet_peer_reset_queues (ENetPeer *);
extern int enet_peer_has_outgoing_commands (ENetPeer *);
extern void enet_peer_setup_outgoing_command (ENetPeer *, ENetOutgoingCommand *);
extern ENetOutgoingCommand * enet_peer_queue_outgoing_command (ENetPeer *, const ENetProtocol *, ENetPacket *, enet_uint32, enet_uint16);
extern ENetIncomingCommand * enet_peer_queue_incoming_command (ENetPeer *, const ENetProtocol *, const void *, size_t, enet_uint32, enet_uint32);
Expand Down
16 changes: 14 additions & 2 deletions thirdparty/enet/host.c
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Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,7 @@ enet_host_create (const ENetAddress * address, size_t peerCount, size_t channelL
host -> totalSentPackets = 0;
host -> totalReceivedData = 0;
host -> totalReceivedPackets = 0;
host -> totalQueued = 0;

host -> connectedPeers = 0;
host -> bandwidthLimitedPeers = 0;
Expand Down Expand Up @@ -123,8 +124,8 @@ enet_host_create (const ENetAddress * address, size_t peerCount, size_t channelL

enet_list_clear (& currentPeer -> acknowledgements);
enet_list_clear (& currentPeer -> sentReliableCommands);
enet_list_clear (& currentPeer -> sentUnreliableCommands);
enet_list_clear (& currentPeer -> outgoingCommands);
enet_list_clear (& currentPeer -> outgoingSendReliableCommands);
enet_list_clear (& currentPeer -> dispatchedCommands);

enet_peer_reset (currentPeer);
Expand Down Expand Up @@ -160,6 +161,16 @@ enet_host_destroy (ENetHost * host)
enet_free (host);
}

enet_uint32
enet_host_random (ENetHost * host)
{
/* Mulberry32 by Tommy Ettinger */
enet_uint32 n = (host -> randomSeed += 0x6D2B79F5U);
n = (n ^ (n >> 15)) * (n | 1U);
n ^= n + (n ^ (n >> 7)) * (n | 61U);
return n ^ (n >> 14);
}

/** Initiates a connection to a foreign host.
@param host host seeking the connection
@param address destination for the connection
Expand Down Expand Up @@ -199,7 +210,8 @@ enet_host_connect (ENetHost * host, const ENetAddress * address, size_t channelC
currentPeer -> channelCount = channelCount;
currentPeer -> state = ENET_PEER_STATE_CONNECTING;
currentPeer -> address = * address;
currentPeer -> connectID = ++ host -> randomSeed;
currentPeer -> connectID = enet_host_random (host);
currentPeer -> mtu = host -> mtu;

if (host -> outgoingBandwidth == 0)
currentPeer -> windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
Expand Down
77 changes: 35 additions & 42 deletions thirdparty/enet/packet.c
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Expand Up @@ -98,53 +98,46 @@ enet_packet_resize (ENetPacket * packet, size_t dataLength)
return 0;
}

static int initializedCRC32 = 0;
static enet_uint32 crcTable [256];

static enet_uint32
reflect_crc (int val, int bits)
static const enet_uint32 crcTable [256] =
{
int result = 0, bit;

for (bit = 0; bit < bits; bit ++)
{
if(val & 1) result |= 1 << (bits - 1 - bit);
val >>= 1;
}

return result;
}

static void
initialize_crc32 (void)
{
int byte;

for (byte = 0; byte < 256; ++ byte)
{
enet_uint32 crc = reflect_crc (byte, 8) << 24;
int offset;
0, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x5005713,
0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0xBDBDF21,
0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
};

for(offset = 0; offset < 8; ++ offset)
{
if (crc & 0x80000000)
crc = (crc << 1) ^ 0x04c11db7;
else
crc <<= 1;
}

crcTable [byte] = reflect_crc (crc, 32);
}

initializedCRC32 = 1;
}

enet_uint32
enet_crc32 (const ENetBuffer * buffers, size_t bufferCount)
{
enet_uint32 crc = 0xFFFFFFFF;

if (! initializedCRC32) initialize_crc32 ();

while (bufferCount -- > 0)
{
Expand All @@ -153,7 +146,7 @@ enet_crc32 (const ENetBuffer * buffers, size_t bufferCount)

while (data < dataEnd)
{
crc = (crc >> 8) ^ crcTable [(crc & 0xFF) ^ *data++];
crc = (crc >> 8) ^ crcTable [(crc & 0xFF) ^ *data++];
}

++ buffers;
Expand Down
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