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Diffstat (limited to '')
| -rw-r--r-- | src/contrib/net.h | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/src/contrib/net.h b/src/contrib/net.h new file mode 100644 index 0000000..1b6b527 --- /dev/null +++ b/src/contrib/net.h @@ -0,0 +1,185 @@ +/* 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); |