274 lines
8.4 KiB
C
274 lines
8.4 KiB
C
/*
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* util/tube.h - pipe service
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*
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* Copyright (c) 2008, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains pipe service functions.
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*/
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#ifndef UTIL_TUBE_H
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#define UTIL_TUBE_H
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struct comm_reply;
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struct comm_point;
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struct comm_base;
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struct tube;
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struct tube_res_list;
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#ifdef USE_WINSOCK
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#include "util/locks.h"
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#include "util/winsock_event.h"
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#endif
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/**
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* Callback from pipe listen function
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* void mycallback(tube, msg, len, error, user_argument);
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* if error is true (NETEVENT_*), msg is probably NULL.
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*/
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typedef void tube_callback_t(struct tube*, uint8_t*, size_t, int, void*);
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/**
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* A pipe
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*/
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struct tube {
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#ifndef USE_WINSOCK
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/** pipe end to read from */
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int sr;
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/** pipe end to write on */
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int sw;
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/** listen commpoint */
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struct comm_point* listen_com;
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/** listen callback */
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tube_callback_t* listen_cb;
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/** listen callback user arg */
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void* listen_arg;
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/** are we currently reading a command, 0 if not, else bytecount */
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size_t cmd_read;
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/** size of current read command, may be partially read */
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uint32_t cmd_len;
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/** the current read command content, malloced, can be partially read*/
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uint8_t* cmd_msg;
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/** background write queue, commpoint to write results back */
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struct comm_point* res_com;
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/** are we curently writing a result, 0 if not, else bytecount into
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* the res_list first entry. */
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size_t res_write;
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/** list of outstanding results to be written back */
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struct tube_res_list* res_list;
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/** last in list */
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struct tube_res_list* res_last;
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#else /* USE_WINSOCK */
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/** listen callback */
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tube_callback_t* listen_cb;
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/** listen callback user arg */
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void* listen_arg;
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/** the windows sockets event (signaled if items in pipe) */
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WSAEVENT event;
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/** winsock event storage when registered with event base */
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struct event ev_listen;
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/** lock on the list of outstanding items */
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lock_basic_t res_lock;
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/** list of outstanding results on pipe */
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struct tube_res_list* res_list;
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/** last in list */
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struct tube_res_list* res_last;
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#endif /* USE_WINSOCK */
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};
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/**
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* List of results (arbitrary command serializations) to write back
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*/
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struct tube_res_list {
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/** next in list */
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struct tube_res_list* next;
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/** serialized buffer to write */
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uint8_t* buf;
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/** length to write */
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uint32_t len;
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};
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/**
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* Create a pipe
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* @return: new tube struct or NULL on error.
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*/
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struct tube* tube_create(void);
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/**
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* Delete and destroy a pipe
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* @param tube: to delete
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*/
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void tube_delete(struct tube* tube);
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/**
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* Write length bytes followed by message.
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* @param tube: the tube to write on.
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* If that tube is a pipe, its write fd is used as
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* the socket to write on. Is nonblocking.
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* Set to blocking by the function,
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* and back to non-blocking at exit of function.
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* @param buf: the message.
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* @param len: length of message.
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* @param nonblock: if set to true, the first write is nonblocking.
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* If the first write fails the function returns -1.
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* If set false, the first write is blocking.
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* @return: all remainder writes are nonblocking.
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* return 0 on error, in that case blocking/nonblocking of socket is
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* unknown.
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* return 1 if all OK.
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*/
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int tube_write_msg(struct tube* tube, uint8_t* buf, uint32_t len,
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int nonblock);
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/**
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* Read length bytes followed by message.
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* @param tube: The tube to read on.
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* If that tube is a pipe, its read fd is used as
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* the socket to read on. Is nonblocking.
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* Set to blocking by the function,
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* and back to non-blocking at exit of function.
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* @param buf: the message, malloced.
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* @param len: length of message, returned.
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* @param nonblock: if set to true, the first read is nonblocking.
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* If the first read fails the function returns -1.
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* If set false, the first read is blocking.
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* @return: all remainder reads are nonblocking.
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* return 0 on error, in that case blocking/nonblocking of socket is
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* unknown. On EOF 0 is returned.
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* return 1 if all OK.
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*/
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int tube_read_msg(struct tube* tube, uint8_t** buf, uint32_t* len,
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int nonblock);
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/**
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* Close read part of the pipe.
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* The tube can no longer be read from.
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* @param tube: tube to operate on.
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*/
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void tube_close_read(struct tube* tube);
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/**
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* Close write part of the pipe.
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* The tube can no longer be written to.
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* @param tube: tube to operate on.
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*/
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void tube_close_write(struct tube* tube);
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/**
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* See if data is ready for reading on the tube without blocking.
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* @param tube: tube to check for readable items
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* @return true if readable items are present. False if not (or error).
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* true on pipe_closed.
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*/
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int tube_poll(struct tube* tube);
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/**
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* Wait for data to be ready for reading on the tube. is blocking.
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* No timeout.
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* @param tube: the tube to wait on.
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* @return: if there was something to read (false on error).
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* true on pipe_closed.
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*/
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int tube_wait(struct tube* tube);
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/**
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* Get FD that is readable when new information arrives.
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* @param tube
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* @return file descriptor.
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*/
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int tube_read_fd(struct tube* tube);
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/**
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* Start listening for information over the pipe.
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* Background registration of a read listener, callback when read completed.
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* Do not mix with tube_read_msg style direct reads from the pipe.
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* @param tube: tube to listen on
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* @param base: what base to register event callback.
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* @param cb: callback routine.
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* @param arg: user argument for callback routine.
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* @return true if successful, false on error.
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*/
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int tube_setup_bg_listen(struct tube* tube, struct comm_base* base,
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tube_callback_t* cb, void* arg);
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/**
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* Remove bg listen setup from event base.
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* @param tube: what tube to cleanup
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*/
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void tube_remove_bg_listen(struct tube* tube);
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/**
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* Start background write handler for the pipe.
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* Do not mix with tube_write_msg style direct writes to the pipe.
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* @param tube: tube to write on
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* @param base: what base to register event handler on.
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* @return true if successful, false on error.
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*/
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int tube_setup_bg_write(struct tube* tube, struct comm_base* base);
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/**
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* Remove bg write setup from event base.
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* @param tube: what tube to cleanup
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*/
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void tube_remove_bg_write(struct tube* tube);
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/**
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* Append data item to background list of writes.
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* Mallocs a list entry behind the scenes.
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* Not locked behind the scenes, call from one thread or lock on outside.
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* @param tube: what tube to queue on.
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* @param msg: memory message to send. Is free()d after use.
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* Put at the end of the to-send queue.
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* @param len: length of item.
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* @return 0 on failure (msg freed).
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*/
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int tube_queue_item(struct tube* tube, uint8_t* msg, size_t len);
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/** for fptr wlist, callback function */
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int tube_handle_listen(struct comm_point* c, void* arg, int error,
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struct comm_reply* reply_info);
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/** for fptr wlist, callback function */
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int tube_handle_write(struct comm_point* c, void* arg, int error,
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struct comm_reply* reply_info);
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/** for fptr wlist, winsock signal event callback function */
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void tube_handle_signal(int fd, short events, void* arg);
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#endif /* UTIL_TUBE_H */
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