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Diffstat (limited to '')
| -rw-r--r-- | src/utils/common/netio.h | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/src/utils/common/netio.h b/src/utils/common/netio.h new file mode 100644 index 0000000..d861149 --- /dev/null +++ b/src/utils/common/netio.h @@ -0,0 +1,229 @@ +/* Copyright (C) 2017 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/>. + */ +/*! + * \file + * + * \brief Networking abstraction for utilities. + * + * \addtogroup knot_utils + * @{ + */ + +#pragma once + +#include <netdb.h> +#include <stdint.h> +#include <sys/socket.h> + +#include "utils/common/params.h" +#include "utils/common/tls.h" + +/*! \brief Structure containing server information. */ +typedef struct { + /*! List node (for list container). */ + node_t n; + /*! Name or address of the server. */ + char *name; + /*! Name or number of the service. */ + char *service; +} srv_info_t; + +typedef enum { + NET_FLAGS_NONE = 0, + NET_FLAGS_FASTOPEN = 1 << 0, +} net_flags_t; + +typedef struct { + /*! Socket descriptor. */ + int sockfd; + + /*! IP protocol type. */ + int iptype; + /*! Socket type. */ + int socktype; + /*! Timeout for all network operations. */ + int wait; + /*! Connection flags. */ + net_flags_t flags; + + /*! Local interface parameters. */ + const srv_info_t *local; + /*! Remote server parameters. */ + const srv_info_t *remote; + + /*! Local description string (used for logging). */ + char *local_str; + /*! Remote description string (used for logging). */ + char *remote_str; + + /*! Output from getaddrinfo for remote server. If the server is + * specified using domain name, this structure may contain more + * results. + */ + struct addrinfo *remote_info; + /*! Currently used result from remote_info. */ + struct addrinfo *srv; + /*! Output from getaddrinfo for local address. Only first result is + * used. + */ + struct addrinfo *local_info; + + /*! TLS context. */ + tls_ctx_t tls; +} net_t; + +/*! + * \brief Creates and fills server structure. + * + * \param name Address or host name. + * \param service Port number or service name. + * + * \retval server if success. + * \retval NULL if error. + */ +srv_info_t *srv_info_create(const char *name, const char *service); + +/*! + * \brief Destroys server structure. + * + * \param server Server structure to destroy. + */ +void srv_info_free(srv_info_t *server); + +/*! + * \brief Translates enum IP version type to int version. + * + * \param ip IP version to convert. + * + * \retval AF_INET, AF_INET6 or AF_UNSPEC. + */ +int get_iptype(const ip_t ip); + +/*! + * \brief Translates enum IP protocol type to int version in context to the + * current DNS query type. + * + * \param proto IP protocol type to convert. + * \param type DNS query type number. + * + * \retval SOCK_STREAM or SOCK_DGRAM. + */ +int get_socktype(const protocol_t proto, const uint16_t type); + +/*! + * \brief Translates int socket type to the common string one. + * + * \param socktype Socket type (SOCK_STREAM or SOCK_DGRAM). + * + * \retval "TCP" or "UDP". + */ +const char *get_sockname(const int socktype); + +/*! + * \brief Translates int socket type to the common string one. + * + * \param ss Socket address storage. + * \param socktype Socket type (SOCK_STREAM or SOCK_DGRAM). + * \param dst Output string. + */ +void get_addr_str(const struct sockaddr_storage *ss, + const int socktype, + char **dst); + +/*! + * \brief Initializes network structure and resolves local and remote addresses. + * + * \param local Local address and service description. + * \param remote Remote address and service description. + * \param iptype IP version. + * \param socktype Socket type. + * \param wait Network timeout interval. + * \param tls_params TLS parameters. + * \param flags Connection flags. + * \param net Network structure to initialize. + * + * \retval KNOT_EOK if success. + * \retval errcode if error. + */ +int net_init(const srv_info_t *local, + const srv_info_t *remote, + const int iptype, + const int socktype, + const int wait, + const net_flags_t flags, + const tls_params_t *tls_params, + net_t *net); + +/*! + * \brief Creates socket and connects (if TCP) to remote address specified + * by net->srv. + * + * \param net Connection parameters. + * + * \retval KNOT_EOK if success. + * \retval errcode if error. + */ +int net_connect(net_t *net); + +/*! + * \brief Fills in local address information. + * + * \param net Connection parameters. + * + * \retval KNOT_EOK if success. + * \retval errcode if error. + */ +int net_set_local_info(net_t *net); + +/*! + * \brief Sends data to connected remote server. + * + * \param net Connection parameters. + * \param buf Data to send. + * \param buf_len Length of the data to send. + * + * \retval KNOT_EOK if success. + * \retval errcode if error. + */ +int net_send(const net_t *net, const uint8_t *buf, const size_t buf_len); + +/*! + * \brief Receives data from connected remote server. + * + * \param net Connection parameters. + * \param buf Buffer for incoming data. + * \param buf_len Length of the buffer. + * + * \retval >=0 length of successfully received data. + * \retval errcode if error. + */ +int net_receive(const net_t *net, uint8_t *buf, const size_t buf_len); + +/*! + * \brief Closes current network connection. + * + * \param net Connection parameters. + */ +void net_close(net_t *net); + +/*! + * \brief Cleans up network structure. + * + * \param net Connection parameters. + */ +void net_clean(net_t *net); + +/*! @} */ |