feat: allow for larger incoming NGC packets

Author: zoff99

other/bootstrap_daemon/docker/tox-bootstrapd.sha256

@@ -1 +1 @@
-a5b7485734edb8ce54146f95391d7e14ea9cce4dbc92ded64230e1933a3371e8  /usr/local/bin/tox-bootstrapd
+b2996d73cab7c7453dc10ccf7ad733622558de3b1ad0db824a379cf96f500379  /usr/local/bin/tox-bootstrapd

toxcore/group_chats.c

@@ -108,17 +108,29 @@ static_assert(GCC_BUFFER_SIZE <= UINT16_MAX,
 static_assert(MAX_GC_PACKET_CHUNK_SIZE < MAX_GC_PACKET_SIZE,
               "MAX_GC_PACKET_CHUNK_SIZE must be < MAX_GC_PACKET_SIZE");
 
+static_assert(MAX_GC_PACKET_INCOMING_CHUNK_SIZE < MAX_GC_PACKET_SIZE,
+              "MAX_GC_PACKET_INCOMING_CHUNK_SIZE must be < MAX_GC_PACKET_SIZE");
+
+static_assert(MAX_GC_PACKET_INCOMING_CHUNK_SIZE >= MAX_GC_PACKET_CHUNK_SIZE,
+              "MAX_GC_PACKET_INCOMING_CHUNK_SIZE must be >= MAX_GC_PACKET_CHUNK_SIZE");
+
 // size of a lossless handshake packet - lossless packets can't/shouldn't be split up
 static_assert(MAX_GC_PACKET_CHUNK_SIZE >= 171,
               "MAX_GC_PACKET_CHUNK_SIZE must be >= 171");
 
+static_assert(MAX_GC_PACKET_INCOMING_CHUNK_SIZE >= 171,
+              "MAX_GC_PACKET_INCOMING_CHUNK_SIZE must be >= 171");
+
 // group_moderation constants assume this is the max packet size.
 static_assert(MAX_GC_PACKET_SIZE >= 50000,
               "MAX_GC_PACKET_SIZE doesn't match constants in group_moderation.h");
 
 static_assert(MAX_GC_PACKET_SIZE <= UINT16_MAX - MAX_GC_PACKET_CHUNK_SIZE,
               "MAX_GC_PACKET_SIZE must be <= UINT16_MAX - MAX_GC_PACKET_CHUNK_SIZE");
 
+static_assert(MAX_GC_PACKET_SIZE <= UINT16_MAX - MAX_GC_PACKET_INCOMING_CHUNK_SIZE,
+              "MAX_GC_PACKET_SIZE must be <= UINT16_MAX - MAX_GC_PACKET_INCOMING_CHUNK_SIZE");
+
 /** Types of broadcast messages. */
 typedef enum Group_Message_Type {
     GC_MESSAGE_TYPE_NORMAL = 0x00,
@@ -6255,13 +6267,13 @@ static int handle_gc_tcp_packet(void *object, int id, const uint8_t *packet, uin
 
     if (length <= MIN_TCP_PACKET_SIZE) {
         LOGGER_WARNING(m->log, "Got tcp packet with invalid length: %u (expected %u to %u)", length,
-                       MIN_TCP_PACKET_SIZE, MAX_GC_PACKET_CHUNK_SIZE + MIN_TCP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE);
+                       MIN_TCP_PACKET_SIZE, MAX_GC_PACKET_INCOMING_CHUNK_SIZE + MIN_TCP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE);
         return -1;
     }
 
-    if (length > MAX_GC_PACKET_CHUNK_SIZE + MIN_TCP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE) {
+    if (length > MAX_GC_PACKET_INCOMING_CHUNK_SIZE + MIN_TCP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE) {
         LOGGER_WARNING(m->log, "Got tcp packet with invalid length: %u (expected %u to %u)", length,
-                       MIN_TCP_PACKET_SIZE, MAX_GC_PACKET_CHUNK_SIZE + MIN_TCP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE);
+                       MIN_TCP_PACKET_SIZE, MAX_GC_PACKET_INCOMING_CHUNK_SIZE + MIN_TCP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE);
         return -1;
     }
 
@@ -6336,13 +6348,13 @@ static int handle_gc_tcp_oob_packet(void *object, const uint8_t *public_key, uns
 
     if (length <= GC_MIN_HS_PACKET_PAYLOAD_SIZE) {
         LOGGER_WARNING(m->log, "Got tcp oob packet with invalid length: %u (expected %u to %u)", length,
-                       GC_MIN_HS_PACKET_PAYLOAD_SIZE, MAX_GC_PACKET_CHUNK_SIZE + CRYPTO_MAC_SIZE + CRYPTO_NONCE_SIZE);
+                       GC_MIN_HS_PACKET_PAYLOAD_SIZE, MAX_GC_PACKET_INCOMING_CHUNK_SIZE + CRYPTO_MAC_SIZE + CRYPTO_NONCE_SIZE);
         return -1;
     }
 
-    if (length > MAX_GC_PACKET_CHUNK_SIZE + CRYPTO_MAC_SIZE + CRYPTO_NONCE_SIZE) {
+    if (length > MAX_GC_PACKET_INCOMING_CHUNK_SIZE + CRYPTO_MAC_SIZE + CRYPTO_NONCE_SIZE) {
         LOGGER_WARNING(m->log, "Got tcp oob packet with invalid length: %u (expected %u to %u)", length,
-                       GC_MIN_HS_PACKET_PAYLOAD_SIZE, MAX_GC_PACKET_CHUNK_SIZE + CRYPTO_MAC_SIZE + CRYPTO_NONCE_SIZE);
+                       GC_MIN_HS_PACKET_PAYLOAD_SIZE, MAX_GC_PACKET_INCOMING_CHUNK_SIZE + CRYPTO_MAC_SIZE + CRYPTO_NONCE_SIZE);
         return -1;
     }
 
@@ -6392,13 +6404,13 @@ static int handle_gc_udp_packet(void *object, const IP_Port *ipp, const uint8_t
 
     if (length <= MIN_UDP_PACKET_SIZE) {
         LOGGER_WARNING(m->log, "Got UDP packet with invalid length: %u (expected %u to %u)", length,
-                       MIN_UDP_PACKET_SIZE, MAX_GC_PACKET_CHUNK_SIZE + MIN_UDP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE);
+                       MIN_UDP_PACKET_SIZE, MAX_GC_PACKET_INCOMING_CHUNK_SIZE + MIN_UDP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE);
         return -1;
     }
 
-    if (length > MAX_GC_PACKET_CHUNK_SIZE + MIN_UDP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE) {
+    if (length > MAX_GC_PACKET_INCOMING_CHUNK_SIZE + MIN_UDP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE) {
         LOGGER_WARNING(m->log, "Got UDP packet with invalid length: %u (expected %u to %u)", length,
-                       MIN_UDP_PACKET_SIZE, MAX_GC_PACKET_CHUNK_SIZE + MIN_UDP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE);
+                       MIN_UDP_PACKET_SIZE, MAX_GC_PACKET_INCOMING_CHUNK_SIZE + MIN_UDP_PACKET_SIZE + ENC_PUBLIC_KEY_SIZE);
         return -1;
     }
 

toxcore/group_common.h

@@ -28,6 +28,8 @@
  * For an explanation on why this value was chosen, see the following link: https://archive.ph/vsCOG
  */
 #define MAX_GC_PACKET_CHUNK_SIZE 500
+/* Max size of an incoming packet chunk that is allowed */
+#define MAX_GC_PACKET_INCOMING_CHUNK_SIZE 1372
 
 #define MAX_GC_MESSAGE_SIZE GROUP_MAX_MESSAGE_LENGTH
 #define MAX_GC_MESSAGE_RAW_SIZE (MAX_GC_MESSAGE_SIZE + GC_MESSAGE_PSEUDO_ID_SIZE)

toxcore/group_connection.c

@@ -366,7 +366,7 @@ static uint16_t reassemble_packet(const Logger *log, GC_Connection *gconn, uint8
     // search backwards in recv array until we find an empty slot or a non-fragment packet type
     while (!array_entry_is_empty(entry) && entry->packet_type == GP_FRAGMENT) {
         assert(entry->data != nullptr);
-        assert(entry->data_length <= MAX_GC_PACKET_CHUNK_SIZE);
+        assert(entry->data_length <= MAX_GC_PACKET_INCOMING_CHUNK_SIZE);
 
         const uint16_t diff = packet_length + entry->data_length;