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+/*
+ * Authored by Alex Hultman, 2018-2019.
+ * Intellectual property of third-party.
+
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+
+ * http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef us_malloc
+#define us_malloc malloc
+#endif
+
+#ifndef us_realloc
+#define us_realloc realloc
+#endif
+
+#ifndef us_free
+#define us_free free
+#endif
+
+#ifndef LIBUSOCKETS_H
+#define LIBUSOCKETS_H
+
+
+/* 512kb shared receive buffer */
+#define LIBUS_RECV_BUFFER_LENGTH 524288
+/* A timeout granularity of 4 seconds means give or take 4 seconds from set timeout */
+#define LIBUS_TIMEOUT_GRANULARITY 4
+/* 32 byte padding of receive buffer ends */
+#define LIBUS_RECV_BUFFER_PADDING 32
+/* Guaranteed alignment of extension memory */
+#define LIBUS_EXT_ALIGNMENT 16
+
+/* Define what a socket descriptor is based on platform */
+#ifdef _WIN32
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+#include <winsock2.h>
+#define LIBUS_SOCKET_DESCRIPTOR SOCKET
+#else
+#define LIBUS_SOCKET_DESCRIPTOR int
+#endif
+
+#include "stddef.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum {
+ /* No meaning, default listen option */
+ LIBUS_LISTEN_DEFAULT,
+ /* We exclusively own this port, do not share it */
+ LIBUS_LISTEN_EXCLUSIVE_PORT
+};
+
+/* Library types publicly available */
+struct us_socket_t;
+struct us_timer_t;
+struct us_socket_context_t;
+struct us_loop_t;
+struct us_poll_t;
+struct us_udp_socket_t;
+struct us_udp_packet_buffer_t;
+
+
+struct us_cert_string_t {
+ const char* str;
+ size_t len;
+};
+
+/* Public interface for UDP sockets */
+
+/* Peeks data and length of UDP payload */
+char *us_udp_packet_buffer_payload(struct us_udp_packet_buffer_t *buf, int index);
+int us_udp_packet_buffer_payload_length(struct us_udp_packet_buffer_t *buf, int index);
+
+/* Copies out local (received destination) ip (4 or 16 bytes) of received packet */
+int us_udp_packet_buffer_local_ip(struct us_udp_packet_buffer_t *buf, int index, char *ip);
+
+/* Get the bound port in host byte order */
+int us_udp_socket_bound_port(struct us_udp_socket_t *s);
+
+/* Peeks peer addr (sockaddr) of received packet */
+char *us_udp_packet_buffer_peer(struct us_udp_packet_buffer_t *buf, int index);
+
+/* Peeks ECN of received packet */
+int us_udp_packet_buffer_ecn(struct us_udp_packet_buffer_t *buf, int index);
+
+/* Receives a set of packets into specified packet buffer */
+int us_udp_socket_receive(struct us_udp_socket_t *s, struct us_udp_packet_buffer_t *buf);
+
+void us_udp_buffer_set_packet_payload(struct us_udp_packet_buffer_t *send_buf, int index, int offset, void *payload, int length, void *peer_addr);
+
+int us_udp_socket_send(struct us_udp_socket_t *s, struct us_udp_packet_buffer_t *buf, int num);
+
+/* Allocates a packet buffer that is reuable per thread. Mutated by us_udp_socket_receive. */
+struct us_udp_packet_buffer_t *us_create_udp_packet_buffer();
+
+/* Creates a (heavy-weight) UDP socket with a user space ring buffer. Again, this one is heavy weight and
+ * shoud be reused. One entire QUIC server can be implemented using only one single UDP socket so weight
+ * is not a concern as is the case for TCP sockets which are 1-to-1 with TCP connections. */
+//struct us_udp_socket_t *us_create_udp_socket(struct us_loop_t *loop, void (*read_cb)(struct us_udp_socket_t *), unsigned short port);
+
+//struct us_udp_socket_t *us_create_udp_socket(struct us_loop_t *loop, void (*data_cb)(struct us_udp_socket_t *, struct us_udp_packet_buffer_t *, int), void (*drain_cb)(struct us_udp_socket_t *), char *host, unsigned short port);
+
+struct us_udp_socket_t *us_create_udp_socket(struct us_loop_t *loop, struct us_udp_packet_buffer_t *buf, void (*data_cb)(struct us_udp_socket_t *, struct us_udp_packet_buffer_t *, int), void (*drain_cb)(struct us_udp_socket_t *), const char *host, unsigned short port, void *user);
+
+/* This one is ugly, should be ext! not user */
+void *us_udp_socket_user(struct us_udp_socket_t *s);
+
+/* Binds the UDP socket to an interface and port */
+int us_udp_socket_bind(struct us_udp_socket_t *s, const char *hostname, unsigned int port);
+
+/* Public interfaces for timers */
+
+/* Create a new high precision, low performance timer. May fail and return null */
+struct us_timer_t *us_create_timer(struct us_loop_t *loop, int fallthrough, unsigned int ext_size);
+
+/* Returns user data extension for this timer */
+void *us_timer_ext(struct us_timer_t *timer);
+
+/* */
+void us_timer_close(struct us_timer_t *timer);
+
+/* Arm a timer with a delay from now and eventually a repeat delay.
+ * Specify 0 as repeat delay to disable repeating. Specify both 0 to disarm. */
+void us_timer_set(struct us_timer_t *timer, void (*cb)(struct us_timer_t *t), int ms, int repeat_ms);
+
+/* Returns the loop for this timer */
+struct us_loop_t *us_timer_loop(struct us_timer_t *t);
+
+/* Public interfaces for contexts */
+
+struct us_socket_context_options_t {
+ const char *key_file_name;
+ const char *cert_file_name;
+ const char *passphrase;
+ const char *dh_params_file_name;
+ const char *ca_file_name;
+ const char *ssl_ciphers;
+ int ssl_prefer_low_memory_usage; /* Todo: rename to prefer_low_memory_usage and apply for TCP as well */
+};
+
+struct us_socket_events_t {
+ struct us_socket_t *(*on_open)(struct us_socket_t *, int is_client, char *ip, int ip_length);
+ struct us_socket_t *(*on_data)(struct us_socket_t *, char *data, int length);
+ struct us_socket_t *(*on_writable)(struct us_socket_t *);
+ struct us_socket_t *(*on_close)(struct us_socket_t *, int code, void *reason);
+ //void (*on_timeout)(struct us_socket_context *);
+ struct us_socket_t *(*on_timeout)(struct us_socket_t *);
+ struct us_socket_t *(*on_long_timeout)(struct us_socket_t *);
+ struct us_socket_t *(*on_end)(struct us_socket_t *);
+ struct us_socket_t *(*on_connect_error)(struct us_socket_t *, int code);
+ void (*on_handshake)(struct us_socket_t*, int success, struct us_bun_verify_error_t verify_error, void* custom_data);
+};
+
+struct us_bun_verify_error_t {
+ long error;
+ const char* code;
+ const char* reason;
+};
+
+struct us_bun_socket_context_options_t {
+ const char *key_file_name;
+ const char *cert_file_name;
+ const char *passphrase;
+ const char *dh_params_file_name;
+ const char *ca_file_name;
+ const char *ssl_ciphers;
+ int ssl_prefer_low_memory_usage; /* Todo: rename to prefer_low_memory_usage and apply for TCP as well */
+ const char **key;
+ unsigned int key_count;
+ const char **cert;
+ unsigned int cert_count;
+ const char **ca;
+ unsigned int ca_count;
+ unsigned int secure_options;
+ int reject_unauthorized;
+ int request_cert;
+};
+
+/* Return 15-bit timestamp for this context */
+unsigned short us_socket_context_timestamp(int ssl, struct us_socket_context_t *context);
+
+/* Adds SNI domain and cert in asn1 format */
+void us_socket_context_add_server_name(int ssl, struct us_socket_context_t *context, const char *hostname_pattern, struct us_socket_context_options_t options, void *user);
+void us_bun_socket_context_add_server_name(int ssl, struct us_socket_context_t *context, const char *hostname_pattern, struct us_bun_socket_context_options_t options, void *user);
+void us_socket_context_remove_server_name(int ssl, struct us_socket_context_t *context, const char *hostname_pattern);
+void us_socket_context_on_server_name(int ssl, struct us_socket_context_t *context, void (*cb)(struct us_socket_context_t *, const char *hostname));
+void *us_socket_server_name_userdata(int ssl, struct us_socket_t *s);
+void *us_socket_context_find_server_name_userdata(int ssl, struct us_socket_context_t *context, const char *hostname_pattern);
+
+/* Returns the underlying SSL native handle, such as SSL_CTX or nullptr */
+void *us_socket_context_get_native_handle(int ssl, struct us_socket_context_t *context);
+
+/* A socket context holds shared callbacks and user data extension for associated sockets */
+struct us_socket_context_t *us_create_socket_context(int ssl, struct us_loop_t *loop,
+ int ext_size, struct us_socket_context_options_t options);
+struct us_socket_context_t *us_create_bun_socket_context(int ssl, struct us_loop_t *loop,
+ int ext_size, struct us_bun_socket_context_options_t options);
+
+/* Delete resources allocated at creation time. */
+void us_socket_context_free(int ssl, struct us_socket_context_t *context);
+struct us_bun_verify_error_t us_socket_verify_error(int ssl, struct us_socket_t *context);
+/* Setters of various async callbacks */
+void us_socket_context_on_open(int ssl, struct us_socket_context_t *context,
+ struct us_socket_t *(*on_open)(struct us_socket_t *s, int is_client, char *ip, int ip_length));
+void us_socket_context_on_close(int ssl, struct us_socket_context_t *context,
+ struct us_socket_t *(*on_close)(struct us_socket_t *s, int code, void *reason));
+void us_socket_context_on_data(int ssl, struct us_socket_context_t *context,
+ struct us_socket_t *(*on_data)(struct us_socket_t *s, char *data, int length));
+void us_socket_context_on_writable(int ssl, struct us_socket_context_t *context,
+ struct us_socket_t *(*on_writable)(struct us_socket_t *s));
+void us_socket_context_on_timeout(int ssl, struct us_socket_context_t *context,
+ struct us_socket_t *(*on_timeout)(struct us_socket_t *s));
+void us_socket_context_on_long_timeout(int ssl, struct us_socket_context_t *context,
+ struct us_socket_t *(*on_timeout)(struct us_socket_t *s));
+/* This one is only used for when a connecting socket fails in a late stage. */
+void us_socket_context_on_connect_error(int ssl, struct us_socket_context_t *context,
+ struct us_socket_t *(*on_connect_error)(struct us_socket_t *s, int code));
+
+void us_socket_context_on_handshake(int ssl, struct us_socket_context_t *context, void (*on_handshake)(struct us_socket_context_t *, int success, struct us_bun_verify_error_t verify_error, void* custom_data), void* custom_data);
+
+/* Emitted when a socket has been half-closed */
+void us_socket_context_on_end(int ssl, struct us_socket_context_t *context, struct us_socket_t *(*on_end)(struct us_socket_t *s));
+
+/* Returns user data extension for this socket context */
+void *us_socket_context_ext(int ssl, struct us_socket_context_t *context);
+
+/* Closes all open sockets, including listen sockets. Does not invalidate the socket context. */
+void us_socket_context_close(int ssl, struct us_socket_context_t *context);
+
+/* Listen for connections. Acts as the main driving cog in a server. Will call set async callbacks. */
+struct us_listen_socket_t *us_socket_context_listen(int ssl, struct us_socket_context_t *context,
+ const char *host, int port, int options, int socket_ext_size);
+
+struct us_listen_socket_t *us_socket_context_listen_unix(int ssl, struct us_socket_context_t *context,
+ const char *path, int options, int socket_ext_size);
+
+/* listen_socket.c/.h */
+void us_listen_socket_close(int ssl, struct us_listen_socket_t *ls);
+
+/* Land in on_open or on_connection_error or return null or return socket */
+struct us_socket_t *us_socket_context_connect(int ssl, struct us_socket_context_t *context,
+ const char *host, int port, const char *source_host, int options, int socket_ext_size);
+
+struct us_socket_t *us_socket_context_connect_unix(int ssl, struct us_socket_context_t *context,
+ const char *server_path, int options, int socket_ext_size);
+
+/* Is this socket established? Can be used to check if a connecting socket has fired the on_open event yet.
+ * Can also be used to determine if a socket is a listen_socket or not, but you probably know that already. */
+int us_socket_is_established(int ssl, struct us_socket_t *s);
+
+/* Cancel a connecting socket. Can be used together with us_socket_timeout to limit connection times.
+ * Entirely destroys the socket - this function works like us_socket_close but does not trigger on_close event since
+ * you never got the on_open event first. */
+struct us_socket_t *us_socket_close_connecting(int ssl, struct us_socket_t *s);
+
+/* Returns the loop for this socket context. */
+struct us_loop_t *us_socket_context_loop(int ssl, struct us_socket_context_t *context);
+
+/* Invalidates passed socket, returning a new resized socket which belongs to a different socket context.
+ * Used mainly for "socket upgrades" such as when transitioning from HTTP to WebSocket. */
+struct us_socket_t *us_socket_context_adopt_socket(int ssl, struct us_socket_context_t *context, struct us_socket_t *s, int ext_size);
+
+/* Create a child socket context which acts much like its own socket context with its own callbacks yet still relies on the
+ * parent socket context for some shared resources. Child socket contexts should be used together with socket adoptions and nothing else. */
+struct us_socket_context_t *us_create_child_socket_context(int ssl, struct us_socket_context_t *context, int context_ext_size);
+
+/* Public interfaces for loops */
+
+/* Returns a new event loop with user data extension */
+struct us_loop_t *us_create_loop(void *hint, void (*wakeup_cb)(struct us_loop_t *loop),
+ void (*pre_cb)(struct us_loop_t *loop), void (*post_cb)(struct us_loop_t *loop), unsigned int ext_size);
+
+/* Frees the loop immediately */
+void us_loop_free(struct us_loop_t *loop);
+
+/* Returns the loop user data extension */
+void *us_loop_ext(struct us_loop_t *loop);
+
+/* Blocks the calling thread and drives the event loop until no more non-fallthrough polls are scheduled */
+void us_loop_run(struct us_loop_t *loop);
+
+
+/* Signals the loop from any thread to wake up and execute its wakeup handler from the loop's own running thread.
+ * This is the only fully thread-safe function and serves as the basis for thread safety */
+void us_wakeup_loop(struct us_loop_t *loop);
+
+/* Hook up timers in existing loop */
+void us_loop_integrate(struct us_loop_t *loop);
+
+/* Returns the loop iteration number */
+long long us_loop_iteration_number(struct us_loop_t *loop);
+
+/* Public interfaces for polls */
+
+/* A fallthrough poll does not keep the loop running, it falls through */
+struct us_poll_t *us_create_poll(struct us_loop_t *loop, int fallthrough, unsigned int ext_size);
+
+/* After stopping a poll you must manually free the memory */
+void us_poll_free(struct us_poll_t *p, struct us_loop_t *loop);
+
+/* Associate this poll with a socket descriptor and poll type */
+void us_poll_init(struct us_poll_t *p, LIBUS_SOCKET_DESCRIPTOR fd, int poll_type);
+
+/* Start, change and stop polling for events */
+void us_poll_start(struct us_poll_t *p, struct us_loop_t *loop, int events);
+void us_poll_change(struct us_poll_t *p, struct us_loop_t *loop, int events);
+void us_poll_stop(struct us_poll_t *p, struct us_loop_t *loop);
+
+/* Return what events we are polling for */
+int us_poll_events(struct us_poll_t *p);
+
+/* Returns the user data extension of this poll */
+void *us_poll_ext(struct us_poll_t *p);
+
+/* Get associated socket descriptor from a poll */
+LIBUS_SOCKET_DESCRIPTOR us_poll_fd(struct us_poll_t *p);
+
+/* Resize an active poll */
+struct us_poll_t *us_poll_resize(struct us_poll_t *p, struct us_loop_t *loop, unsigned int ext_size);
+
+/* Public interfaces for sockets */
+
+/* Returns the underlying native handle for a socket, such as SSL or file descriptor.
+ * In the case of file descriptor, the value of pointer is fd. */
+void *us_socket_get_native_handle(int ssl, struct us_socket_t *s);
+
+/* Write up to length bytes of data. Returns actual bytes written.
+ * Will call the on_writable callback of active socket context on failure to write everything off in one go.
+ * Set hint msg_more if you have more immediate data to write. */
+int us_socket_write(int ssl, struct us_socket_t *s, const char *data, int length, int msg_more);
+
+/* Set a low precision, high performance timer on a socket. A socket can only have one single active timer
+ * at any given point in time. Will remove any such pre set timer */
+void us_socket_timeout(int ssl, struct us_socket_t *s, unsigned int seconds);
+
+/* Set a low precision, high performance timer on a socket. Suitable for per-minute precision. */
+void us_socket_long_timeout(int ssl, struct us_socket_t *s, unsigned int minutes);
+
+/* Return the user data extension of this socket */
+void *us_socket_ext(int ssl, struct us_socket_t *s);
+
+/* Return the socket context of this socket */
+struct us_socket_context_t *us_socket_context(int ssl, struct us_socket_t *s);
+
+/* Withdraw any msg_more status and flush any pending data */
+void us_socket_flush(int ssl, struct us_socket_t *s);
+
+/* Shuts down the connection by sending FIN and/or close_notify */
+void us_socket_shutdown(int ssl, struct us_socket_t *s);
+
+/* Shuts down the connection in terms of read, meaning next event loop
+ * iteration will catch the socket being closed. Can be used to defer closing
+ * to next event loop iteration. */
+void us_socket_shutdown_read(int ssl, struct us_socket_t *s);
+
+/* Returns whether the socket has been shut down or not */
+int us_socket_is_shut_down(int ssl, struct us_socket_t *s);
+
+/* Returns whether this socket has been closed. Only valid if memory has not yet been released. */
+int us_socket_is_closed(int ssl, struct us_socket_t *s);
+
+/* Immediately closes the socket */
+struct us_socket_t *us_socket_close(int ssl, struct us_socket_t *s, int code, void *reason);
+
+/* Returns local port or -1 on failure. */
+int us_socket_local_port(int ssl, struct us_socket_t *s);
+
+/* Copy remote (IP) address of socket, or fail with zero length. */
+void us_socket_remote_address(int ssl, struct us_socket_t *s, char *buf, int *length);
+
+/* Bun extras */
+struct us_socket_t *us_socket_detach(int ssl, struct us_socket_t *s);
+struct us_socket_t *us_socket_attach(int ssl, LIBUS_SOCKET_DESCRIPTOR client_fd, struct us_socket_context_t *ctx, int flags, int socket_ext_size);
+struct us_socket_t *us_socket_wrap_with_tls(int ssl, struct us_socket_t *s, struct us_bun_socket_context_options_t options, struct us_socket_events_t events, int socket_ext_size);
+int us_socket_raw_write(int ssl, struct us_socket_t *s, const char *data, int length, int msg_more);
+struct us_socket_t* us_socket_open(int ssl, struct us_socket_t * s, int is_client, char* ip, int ip_length);
+int us_raw_root_certs(struct us_cert_string_t**out);
+
+#ifdef __cplusplus
+}
+#endif
+
+/* Decide what eventing system to use by default */
+#if !defined(LIBUS_USE_EPOLL) && !defined(LIBUS_USE_LIBUV) && !defined(LIBUS_USE_GCD) && !defined(LIBUS_USE_KQUEUE) && !defined(LIBUS_USE_ASIO)
+#if defined(_WIN32)
+#define LIBUS_USE_LIBUV
+#elif defined(__APPLE__) || defined(__FreeBSD__)
+#define LIBUS_USE_KQUEUE
+#else
+#define LIBUS_USE_EPOLL
+#endif
+#endif
+
+#endif // LIBUSOCKETS_H