Squashed 'external/toxcore/c-toxcore/' content from commit 67badf69

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: 67badf69416a74e74f6d7eb51dd96f37282b8455

toxcore/TCP_common.h

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+/* SPDX-License-Identifier: GPL-3.0-or-later
+ * Copyright © 2016-2018 The TokTok team.
+ * Copyright © 2014 Tox project.
+ */
+
+#ifndef C_TOXCORE_TOXCORE_TCP_COMMON_H
+#define C_TOXCORE_TOXCORE_TCP_COMMON_H
+
+#include "crypto_core.h"
+#include "network.h"
+
+typedef struct TCP_Priority_List TCP_Priority_List;
+struct TCP_Priority_List {
+    TCP_Priority_List *next;
+    uint16_t size;
+    uint16_t sent;
+    uint8_t *data;
+};
+
+nullable(1)
+void wipe_priority_list(TCP_Priority_List *p);
+
+#define NUM_RESERVED_PORTS 16
+#define NUM_CLIENT_CONNECTIONS (256 - NUM_RESERVED_PORTS)
+
+#ifdef USE_TEST_NETWORK
+#define TCP_PACKET_FORWARD_REQUEST 11
+#define TCP_PACKET_FORWARDING 10
+#define TCP_PACKET_ROUTING_REQUEST  9
+#define TCP_PACKET_ROUTING_RESPONSE 8
+#define TCP_PACKET_CONNECTION_NOTIFICATION 7
+#define TCP_PACKET_DISCONNECT_NOTIFICATION 6
+#define TCP_PACKET_PING 5
+#define TCP_PACKET_PONG 4
+#define TCP_PACKET_OOB_SEND 3
+#define TCP_PACKET_OOB_RECV 2
+#define TCP_PACKET_ONION_REQUEST  1
+#define TCP_PACKET_ONION_RESPONSE 0
+#else
+#define TCP_PACKET_ROUTING_REQUEST  0
+#define TCP_PACKET_ROUTING_RESPONSE 1
+#define TCP_PACKET_CONNECTION_NOTIFICATION 2
+#define TCP_PACKET_DISCONNECT_NOTIFICATION 3
+#define TCP_PACKET_PING 4
+#define TCP_PACKET_PONG 5
+#define TCP_PACKET_OOB_SEND 6
+#define TCP_PACKET_OOB_RECV 7
+#define TCP_PACKET_ONION_REQUEST  8
+#define TCP_PACKET_ONION_RESPONSE 9
+#define TCP_PACKET_FORWARD_REQUEST 10
+#define TCP_PACKET_FORWARDING 11
+#endif  // test network
+
+#define TCP_HANDSHAKE_PLAIN_SIZE (CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE)
+#define TCP_SERVER_HANDSHAKE_SIZE (CRYPTO_NONCE_SIZE + TCP_HANDSHAKE_PLAIN_SIZE + CRYPTO_MAC_SIZE)
+#define TCP_CLIENT_HANDSHAKE_SIZE (CRYPTO_PUBLIC_KEY_SIZE + TCP_SERVER_HANDSHAKE_SIZE)
+#define TCP_MAX_OOB_DATA_LENGTH 1024
+
+/** frequency to ping connected nodes and timeout in seconds */
+#define TCP_PING_FREQUENCY 30
+#define TCP_PING_TIMEOUT 10
+
+#define MAX_PACKET_SIZE 2048
+
+typedef struct TCP_Connection {
+    const Random *rng;
+    const Network *ns;
+    Socket sock;
+    IP_Port ip_port;  // for debugging.
+    uint8_t sent_nonce[CRYPTO_NONCE_SIZE]; /* Nonce of sent packets. */
+    uint8_t shared_key[CRYPTO_SHARED_KEY_SIZE];
+    uint8_t last_packet[2 + MAX_PACKET_SIZE];
+    uint16_t last_packet_length;
+    uint16_t last_packet_sent;
+
+    TCP_Priority_List *priority_queue_start;
+    TCP_Priority_List *priority_queue_end;
+} TCP_Connection;
+
+/**
+ * @retval 0 if pending data was sent completely
+ * @retval -1 if it wasn't
+ */
+non_null()
+int send_pending_data_nonpriority(const Logger *logger, TCP_Connection *con);
+
+/**
+ * @retval 0 if pending data was sent completely
+ * @retval -1 if it wasn't
+ */
+non_null()
+int send_pending_data(const Logger *logger, TCP_Connection *con);
+
+/**
+ * @retval 1 on success.
+ * @retval 0 if could not send packet.
+ * @retval -1 on failure (connection must be killed).
+ */
+non_null()
+int write_packet_TCP_secure_connection(
+        const Logger *logger, TCP_Connection *con, const uint8_t *data, uint16_t length,
+        bool priority);
+
+/** @brief Read length bytes from socket.
+ *
+ * return length on success
+ * return -1 on failure/no data in buffer.
+ */
+non_null()
+int read_TCP_packet(
+        const Logger *logger, const Network *ns, Socket sock, uint8_t *data, uint16_t length, const IP_Port *ip_port);
+
+/**
+ * @return length of received packet on success.
+ * @retval 0 if could not read any packet.
+ * @retval -1 on failure (connection must be killed).
+ */
+non_null()
+int read_packet_TCP_secure_connection(
+        const Logger *logger, const Network *ns, Socket sock, uint16_t *next_packet_length,
+        const uint8_t *shared_key, uint8_t *recv_nonce, uint8_t *data,
+        uint16_t max_len, const IP_Port *ip_port);
+
+#endif