/**************************************************************************** * net/local/loal.h * * Copyright (C) 2015 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ #ifndef __NET_LOCAL_LOCAL_H #define __NET_LOCAL_LOCAL_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #ifdef CONFIG_NET_LOCAL /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Packet format in FIFO: * * 1. Sync bytes (7 at most) * 2. End/Start byte * 3. 16-bit packet length (in host order) * 4. Packet data (in host order) */ #define LOCAL_SYNC_BYTE 0x42 /* Byte in sync sequence */ #define LOCAL_END_BYTE 0xbd /* End of sync seqence */ /**************************************************************************** * Public Type Definitions ****************************************************************************/ /* Local, Unix domain socket types */ enum local_type_e { LOCAL_TYPE_UNTYPED = 0, /* Type is not determined until the socket is bound */ LOCAL_TYPE_UNNAMED, /* A Unix socket that is not bound to any name */ LOCAL_TYPE_PATHNAME, /* lc_path holds a null terminated string */ LOCAL_TYPE_ABSTRACT /* lc_path is length zero */ }; /* The state of a Unix socket */ enum local_state_s { /* Common states */ LOCAL_STATE_UNBOUND = 0, /* Created by socket, but not bound */ LOCAL_STATE_BOUND, /* Bound to an path */ /* SOCK_STREAM server only */ LOCAL_STATE_LISTENING, /* Server listening for connections */ /* SOCK_STREAM peers only */ LOCAL_STATE_ACCEPT, /* Client waiting for a connection */ LOCAL_STATE_CONNECTED, /* Peer connected */ LOCAL_STATE_DISCONNECTED /* Peer disconnected */ }; /* Representation of a local connection. There are four types of * connection structures: * * 1. Server. A SOCK_STREAM that only listens for and accepts * connections from server. * 2. Client. A SOCK_STREAM peer that connects via the server. * 3. Peer. A connected SOCK_STREAM that sends() and recvs() packets. * May either be the client that connect with the server of the * new peer connect generated with the connection was accepted by * the server. * * And * * 4. Connectionless. Like a peer but using a connectionless datagram * style of communication. SOCK_DRAM support has not yet been * implemented. */ struct local_conn_s { /* lc_node supports a doubly linked list: Listening SOCK_STREAM servers * will be linked into a list of listeners; SOCK_STREAM clients will be * linked to the lc_waiters and lc_conn lists. */ dq_entry_t lc_node; /* Supports a doubly linked list */ /* Fields common to SOCK_STREAM and SOCK_DGRAM */ uint8_t lc_crefs; /* Reference counts on this instance */ uint8_t lc_proto; /* SOCK_STREAM or SOCK_DGRAM */ uint8_t lc_type; /* See enum local_type_e */ uint8_t lc_state; /* See enum local_state_e */ int16_t lc_infd; /* File descriptor of read-only FIFO (peers) */ int16_t lc_outfd; /* File descriptor of write-only FIFO (peers) */ char lc_path[UNIX_PATH_MAX]; /* Path assigned by bind() */ /* SOCK_STREAM fields common to both client and server */ sem_t lc_waitsem; /* Use to wait for a connection to be accepted */ /* Union of fields unique to SOCK_STREAM client, server, and connected * peers. */ union { /* Fields unique to the SOCK_STREAM server side */ struct { uint8_t lc_pending; /* Number of pending connections */ uint8_t lc_backlog; /* Maximum number of pending connections */ dq_queue_t lc_waiters; /* List of connections waiting to be accepted */ } server; /* Fields unique to the connecting client side */ struct { uint16_t lc_remaining; /* (For binary compatibility with peer) */ volatile int lc_result; /* Result of the connection operation (client)*/ } client; /* Fields common to connected peers (connected or accepted) */ struct { uint16_t lc_remaining; /* Bytes remaining in the incoming stream */ } peer; } u; }; /**************************************************************************** * Public Data ****************************************************************************/ #ifdef __cplusplus # define EXTERN extern "C" extern "C" { #else # define EXTERN extern #endif /* A list of all SOCK_STREAM listener connections */ EXTERN dq_queue_t g_local_listeners; /**************************************************************************** * Public Function Prototypes ****************************************************************************/ struct sockaddr; /* Forward reference */ struct socket; /* Forward reference */ /**************************************************************************** * Name: local_initialize * * Description: * Initialize the local, Unix domain connection structures. Called once * and only from the common network initialization logic. * ****************************************************************************/ void local_initialize(void); /**************************************************************************** * Name: local_alloc * * Description: * Allocate a new, uninitialized local connection structure. This is * normally something done by the implementation of the socket() API * ****************************************************************************/ FAR struct local_conn_s *local_alloc(void); /**************************************************************************** * Name: local_free * * Description: * Free a local connection structure that is no longer in use. This should * be done by the implementation of close(). * ****************************************************************************/ void local_free(FAR struct local_conn_s *conn); /**************************************************************************** * Name: psock_local_bind * * Description: * This function implements the low-level parts of the standard local * bind()operation. * ****************************************************************************/ int psock_local_bind(FAR struct socket *psock, FAR const struct sockaddr *addr, socklen_t addrlen); /**************************************************************************** * Name: local_connect * * Description: * This function sets up a new local connection. The function will * automatically allocate an unused local port for the new * connection. However, another port can be chosen by using the * psock_local_bind() call, after the local_connect() function has been * called. * * This function is called as part of the implementation of sendto * and recvfrom. * * Input Parameters: * client - A reference to the client-side local connection structure * addr - The address of the remote host. * ****************************************************************************/ int local_connect(FAR struct local_conn_s *client, FAR const struct sockaddr *addr); /**************************************************************************** * Name: local_release * * Description: * If the local, Unix domain socket is in the connected state, then * disconnect it. Release the local connection structure in any event * * Input Parameters: * conn - A reference to local connection structure * ****************************************************************************/ int local_release(FAR struct local_conn_s *conn); /**************************************************************************** * Name: local_listen * * Description: * Listen for a new connection of a SOCK_STREAM Unix domain socket. * * This function is called as part of the implementation of listen(); * * Input Parameters: * server - A reference to the server-side local connection structure * backlog - Maximum number of pending connections. * * Returned Value: * Zero (OK) on success; a negated errno value on failure. * * Assumptions: * The network is NOT locked * ****************************************************************************/ int local_listen(FAR struct local_conn_s *server, int backlog); /**************************************************************************** * Function: psock_local_accept * * Description: * This function implements accept() for Unix domain sockets. See the * description of accept() for further information. * * Parameters: * psock The listening Unix domain socket structure * addr Receives the address of the connecting client * addrlen Input: allocated size of 'addr', Return: returned size of 'addr' * newconn The new, accepted Unix domain connection structure * * Returned Value: * Returns zero (OK) on success or a negated errno value on failure. * See the description of accept of the possible errno values in the * description of accept(). * * Assumptions: * Network is NOT locked. * ****************************************************************************/ int psock_local_accept(FAR struct socket *psock, FAR struct sockaddr *addr, FAR socklen_t *addrlen, FAR void **newconn); /**************************************************************************** * Name: psock_local_send * * Description: * Send a local packet as a stream. * * Parameters: * psock An instance of the internal socket structure. * buf Data to send * len Length of data to send * flags Send flags (ignored for now) * * Return: * On success, returns the number of characters sent. On error, * -1 is returned, and errno is set appropriately (see send() for the * list of errno numbers). * ****************************************************************************/ ssize_t psock_local_send(FAR struct socket *psock, FAR const void *buf, size_t len, int flags); /**************************************************************************** * Function: psock_local_sendto * * Description: * This function implements the Unix domain-specific logic of the * standard sendto() socket operation. * * Input Parameters: * psock A pointer to a NuttX-specific, internal socket structure * buf Data to send * len Length of data to send * flags Send flags * to Address of recipient * tolen The length of the address structure * * NOTE: All input parameters were verified by sendto() before this * function was called. * * Returned Value: * On success, returns the number of characters sent. On error, * a negated errno value is returned. See the description in * net/socket/sendto.c for the list of appropriate return value. * ****************************************************************************/ ssize_t psock_local_sendto(FAR struct socket *psock, FAR const void *buf, size_t len, int flags, FAR const struct sockaddr *to, socklen_t tolen); /**************************************************************************** * Name: local_send_packet * * Description: * Send a packet on the write-only FIFO. * * Parameters: * fd File descriptor of write-only FIFO. * buf Data to send * len Length of data to send * * Return: * Zero is returned on success; a negated errno value is returned on any * failure. * ****************************************************************************/ int local_send_packet(int fd, FAR const uint8_t *buf, size_t len); /**************************************************************************** * Function: psock_recvfrom * * Description: * recvfrom() receives messages from a local socket, and may be used to * receive data on a socket whether or not it is connection-oriented. * * If from is not NULL, and the underlying protocol provides the source * address, this source address is filled in. The argument fromlen * initialized to the size of the buffer associated with from, and modified * on return to indicate the actual size of the address stored there. * * Parameters: * psock A pointer to a NuttX-specific, internal socket structure * buf Buffer to receive data * len Length of buffer * flags Receive flags (ignored for now) * from Address of source (may be NULL) * fromlen The length of the address structure * * Returned Value: * On success, returns the number of characters sent. If no data is * available to be received and the peer has performed an orderly shutdown, * recv() will return 0. Otherwise, on errors, -1 is returned, and errno * is set appropriately (see receivefrom for the complete list). * ****************************************************************************/ ssize_t psock_local_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len, int flags, FAR struct sockaddr *from, FAR socklen_t *fromlen); /**************************************************************************** * Name: local_fifo_read * * Description: * Read a data from the read-only FIFO. * * Parameters: * fd - File descriptor of read-only FIFO. * buf - Local to store the received data * len - Length of data to receive [in] * Length of data actually received [out] * * Return: * Zero is returned on success; a negated errno value is returned on any * failure. If -ECONNRESET is received, then the sending side has closed * the FIFO. In this case, the returned data may still be valid (if the * returned len > 0). * ****************************************************************************/ int local_fifo_read(int fd, FAR uint8_t *buf, size_t *len); /**************************************************************************** * Name: local_getaddr * * Description: * Return the Unix domain address of a connection. * * Parameters: * conn - The connection * addr - The location to return the address * addrlen - The size of the memory allocat by the caller to receive the * address. * * Return: * Zero (OK) on success; a negated errno value on failure. * ****************************************************************************/ int local_getaddr(FAR struct local_conn_s *conn, FAR struct sockaddr *addr, FAR socklen_t *addrlen); /**************************************************************************** * Name: local_sync * * Description: * Read a sync bytes until the start of the packet is found. * * Parameters: * fd - File descriptor of read-only FIFO. * * Return: * The non-zero size of the following packet is returned on success; a * negated errno value is returned on any failure. * ****************************************************************************/ int local_sync(int fd); /**************************************************************************** * Name: local_create_fifos * * Description: * Create the FIFO pair needed for a connection. * ****************************************************************************/ int local_create_fifos(FAR struct local_conn_s *client); /**************************************************************************** * Name: local_destroy_fifos * * Description: * Destroy the FIFO pair used for a connection. * ****************************************************************************/ int local_destroy_fifos(FAR struct local_conn_s *client); /**************************************************************************** * Name: local_open_client_rx * * Description: * Only the client-side Rx FIFO. * ****************************************************************************/ int local_open_client_rx(FAR struct local_conn_s *client); /**************************************************************************** * Name: local_open_client_tx * * Description: * Only the client-side Tx FIFO. * ****************************************************************************/ int local_open_client_tx(FAR struct local_conn_s *client); /**************************************************************************** * Name: local_open_server_rx * * Description: * Only the server-side Rx FIFO. * ****************************************************************************/ int local_open_server_rx(FAR struct local_conn_s *server); /**************************************************************************** * Name: local_open_server_tx * * Description: * Only the server-side Tx FIFO. * ****************************************************************************/ int local_open_server_tx(FAR struct local_conn_s *server); #undef EXTERN #ifdef __cplusplus } #endif #endif /* CONFIG_NET_LOCAL */ #endif /* __NET_LOCAL_LOCAL_H */