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+/* Copyright (C) 2015 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <sys/socket.h>
+
+/*!
+ * \brief Network interface flags.
+ */
+enum net_flags {
+ NET_BIND_NONLOCAL = (1 << 0), //!< Allow to bind unavailable address.
+ NET_BIND_MULTIPLE = (1 << 1), //!< Allow to bind address multiple times.
+};
+
+/*!
+ * \brief Create unbound socket of given family and type.
+ *
+ * \note The socket is set to non-blocking mode.
+ *
+ * \param type Socket transport type (SOCK_STREAM, SOCK_DGRAM).
+ * \param sa Socket address.
+ *
+ * \return socket or error code
+ */
+int net_unbound_socket(int type, const struct sockaddr *sa);
+
+/*!
+ * \brief Create socket bound to given address.
+ *
+ * The socket is set to non-blocking mode.
+ *
+ * \param type Socket transport type (SOCK_STREAM, SOCK_DGRAM).
+ * \param sa Socket address.
+ * \param flags Socket binding options.
+ *
+ * \return socket or error code
+ */
+int net_bound_socket(int type, const struct sockaddr *sa, enum net_flags flags);
+
+/*!
+ * \brief Create socket connected (asynchronously) to destination address.
+ *
+ * \note The socket is set to non-blocking mode.
+ *
+ * \param type Socket transport type (SOCK_STREAM, SOCK_DGRAM).
+ * \param dst_addr Destination address.
+ * \param src_addr Source address (can be NULL).
+ *
+ * \return socket or error code
+ */
+int net_connected_socket(int type, const struct sockaddr *dst_addr,
+ const struct sockaddr *src_addr);
+
+/*!
+ * \brief Return true if the socket is fully connected.
+ *
+ * \param sock Socket.
+ *
+ * \return true if connected
+ */
+bool net_is_connected(int sock);
+
+/*!
+ * \brief Get socket type (e.g. \a SOCK_STREAM).
+ *
+ * \param sock Socket.
+ */
+int net_socktype(int sock);
+
+/*!
+ * \brief Check if socket is a SOCK_STREAM socket.
+ */
+bool net_is_stream(int sock);
+
+/*!
+ * \brief Accept a connection on a listening socket.
+ *
+ * \brief The socket is set to non-blocking mode.
+ *
+ * \param sock Socket
+ * \param addr Remote address (can be NULL).
+ *
+ * \return socket or error code
+ */
+int net_accept(int sock, struct sockaddr_storage *addr);
+
+/*!
+ * \brief Send a message on a socket.
+ *
+ * The socket can be SOCK_STREAM or SOCK_DGRAM.
+ *
+ * The implementation handles partial-writes automatically.
+ *
+ * \param[in] sock Socket.
+ * \param[in] buffer Message buffer.
+ * \param[in] size Size of the message.
+ * \param[in] addr Remote address (ignored for SOCK_STREAM).
+ * \param[in] timeout_ms Write timeout in miliseconds (-1 for infinity,
+ * not valid for SOCK_DGRAM).
+ *
+ * \return Number of bytes sent or negative error code.
+ */
+ssize_t net_send(int sock, const uint8_t *buffer, size_t size,
+ const struct sockaddr *addr, int timeout_ms);
+
+/*!
+ * \brief Receive a message from a socket.
+ *
+ * \param[in] sock Socket.
+ * \param[out] buffer Receiving buffer.
+ * \param[in] size Capacity of the receiving buffer.
+ * \param[out] addr Remote address (can be NULL).
+ * \param[in] timeout_ms Read timeout in miliseconds (-1 for infinity).
+ *
+ * \return Number of bytes read or negative error code.
+ */
+ssize_t net_recv(int sock, uint8_t *buffer, size_t size,
+ struct sockaddr_storage *addr, int timeout_ms);
+
+/*!
+ * \brief Send a message on a SOCK_DGRAM socket.
+ *
+ * \see net_send
+ */
+ssize_t net_dgram_send(int sock, const uint8_t *buffer, size_t size,
+ const struct sockaddr *addr);
+
+/*!
+ * \brief Receive a message from a SOCK_DGRAM socket.
+ *
+ * \see net_recv
+ */
+ssize_t net_dgram_recv(int sock, uint8_t *buffer, size_t size, int timeout_ms);
+
+/*!
+ * \brief Send a message on a SOCK_STREAM socket.
+ *
+ * \see net_send
+ */
+ssize_t net_stream_send(int sock, const uint8_t *buffer, size_t size, int timeout_ms);
+
+/*!
+ * \brief Receive a message from a SOCK_STREAM socket.
+ *
+ * \see net_recv
+ */
+ssize_t net_stream_recv(int sock, uint8_t *buffer, size_t size, int timeout_ms);
+
+/*!
+ * \brief Send a DNS message on a TCP socket.
+ *
+ * The outgoing message is prefixed with a two-byte value carrying the DNS
+ * message size according to the specification. These two bytes are not
+ * reflected in the return value.
+ *
+ * \see net_send
+ */
+ssize_t net_dns_tcp_send(int sock, const uint8_t *buffer, size_t size, int timeout_ms);
+
+/*!
+ * \brief Receive a DNS message from a TCP socket.
+ *
+ * The first two bytes of the incoming message are interpreted as a DNS message
+ * size according to the specification. These two bytes are not included in
+ * the returned size. Only a complete DNS message is retrieved.
+ *
+ * \see net_recv
+ */
+ssize_t net_dns_tcp_recv(int sock, uint8_t *buffer, size_t size, int timeout_ms);