fix: correct INIT padding — include SC_NONCE_SIZE + SC_CRC32_SIZE in formula

REQUEST: s_max = mtu - SC_NONCE_SIZE - 3 - SC_CRC32_SIZE - SC_TAG_SIZE
                 - SC_PUBKEY_ENC_SIZE + UDP_SC_HDR_SIZE (= mtu-78, was mtu-61)
RESPONSE: s_max = mtu (noencrypt=0, simple cap)

Removed debug logs.

src/etcp_connections.c

@@ -133,9 +133,8 @@ static void etcp_link_send_init(struct ETCP_LINK* link, uint8_t reset) {
 
     // padding
     int s = rand() % (link->handshake_maxsize - link->handshake_minsize) + link->handshake_minsize;
-    int s_max = (int)(link->mtu) - 3 - (int)SC_TAG_SIZE + (int)UDP_SC_HDR_SIZE - (int)SC_PUBKEY_ENC_SIZE;
+    int s_max = (int)(link->mtu) - (int)SC_NONCE_SIZE - 3 - (int)SC_CRC32_SIZE - (int)SC_TAG_SIZE - (int)SC_PUBKEY_ENC_SIZE + (int)UDP_SC_HDR_SIZE;
-    DEBUG_ERROR(DEBUG_CATEGORY_CONNECTION, "INIT_REQ: mtu=%d s=%d s_max=%d offset=%zu", (int)link->mtu, s, s_max, offset);
+    if (s > s_max) s = s_max;
-    if (s > s_max) { DEBUG_ERROR(DEBUG_CATEGORY_CONNECTION, "INIT_REQ capped s=%d -> %d", s, s_max); s = s_max; }
     if (s < 0) s = 0;
 
     int to_add=s-offset-UDP_HDR_SIZE - UDP_SC_HDR_SIZE;
@@ -162,8 +161,6 @@ static void etcp_link_send_init(struct ETCP_LINK* link, uint8_t reset) {
 
 
     dgram->data_len = offset;
-    DEBUG_ERROR(DEBUG_CATEGORY_CONNECTION, "INIT_REQ final: offset=%zu s=%d to_add=%d data_len=%d noenc=%d",
-                offset, s, to_add, (int)dgram->data_len, (int)dgram->noencrypt_len);
     
     DEBUG_INFO(DEBUG_CATEGORY_CONNECTION, "Sending INIT request to link, node_id=%016llx, retry=%d", (unsigned long long)node_id, link->init_retry_count);
     
@@ -1534,12 +1531,8 @@ void etcp_connections_read_callback_socket(socket_t sock, void* arg) {
     int xoffset=sizeof(*ack_repl_hdr);
     // padding
     int s = rand() % (link->handshake_maxsize - link->handshake_minsize) + link->handshake_minsize;
-    int s_max = (int)(link->mtu) - 3 - (int)SC_TAG_SIZE + (int)UDP_SC_HDR_SIZE;
+    if (s > (int)(link->mtu)) s = (int)(link->mtu);
-    DEBUG_ERROR(DEBUG_CATEGORY_CONNECTION, "INIT_RESP: mtu=%d s=%d s_max=%d xoffset=%d", (int)link->mtu, s, s_max, xoffset);
-    if (s > s_max) { DEBUG_ERROR(DEBUG_CATEGORY_CONNECTION, "INIT_RESP capped s=%d -> %d", s, s_max); s = s_max; }
     if (s < 0) s = 0;
-    // Remove old hardcoded caps
-    // if (s > 1472 + 26) s = 1472 + 26;
 
     int to_add=s - xoffset - UDP_HDR_SIZE - UDP_SC_HDR_SIZE;
     if (to_add<0) to_add=0;
@@ -1548,9 +1541,6 @@ void etcp_connections_read_callback_socket(socket_t sock, void* arg) {
     for (int i=0; i<to_add; i++) pkt->data[xoffset++]=rand();// fill pad
     // padding end
     pkt->data_len=xoffset;
-    DEBUG_ERROR(DEBUG_CATEGORY_CONNECTION, "INIT_RESP final: xoffset=%d s=%d to_add=%d data_len=%d noenc=%d",
-                xoffset, s, to_add, (int)pkt->data_len, (int)pkt->noencrypt_len);
-
     DEBUG_DEBUG(DEBUG_CATEGORY_CONNECTION, "Sending INIT RESPONSE, link=%p, local_link_id=%d, remote_link_id=%d", link, link->local_link_id, link->remote_link_id);
     DEBUG_INFO(DEBUG_CATEGORY_ETCP, "[ETCP DEBUG] Send INIT RESPONSE");
     etcp_encrypt_send(pkt);