273 lines
8.4 KiB
C
273 lines
8.4 KiB
C
/*
|
|
* util/tube.h - pipe service
|
|
*
|
|
* Copyright (c) 2008, NLnet Labs. All rights reserved.
|
|
*
|
|
* This software is open source.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
*
|
|
* 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.
|
|
*
|
|
* Neither the name of the NLNET LABS 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
|
|
* HOLDER 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.
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
*
|
|
* This file contains pipe service functions.
|
|
*/
|
|
|
|
#ifndef UTIL_TUBE_H
|
|
#define UTIL_TUBE_H
|
|
struct comm_reply;
|
|
struct comm_point;
|
|
struct comm_base;
|
|
struct tube;
|
|
struct tube_res_list;
|
|
#ifdef USE_WINSOCK
|
|
#include "util/locks.h"
|
|
#endif
|
|
|
|
/**
|
|
* Callback from pipe listen function
|
|
* void mycallback(tube, msg, len, error, user_argument);
|
|
* if error is true (NETEVENT_*), msg is probably NULL.
|
|
*/
|
|
typedef void tube_callback_type(struct tube*, uint8_t*, size_t, int, void*);
|
|
|
|
/**
|
|
* A pipe
|
|
*/
|
|
struct tube {
|
|
#ifndef USE_WINSOCK
|
|
/** pipe end to read from */
|
|
int sr;
|
|
/** pipe end to write on */
|
|
int sw;
|
|
|
|
/** listen commpoint */
|
|
struct comm_point* listen_com;
|
|
/** listen callback */
|
|
tube_callback_type* listen_cb;
|
|
/** listen callback user arg */
|
|
void* listen_arg;
|
|
/** are we currently reading a command, 0 if not, else bytecount */
|
|
size_t cmd_read;
|
|
/** size of current read command, may be partially read */
|
|
uint32_t cmd_len;
|
|
/** the current read command content, malloced, can be partially read*/
|
|
uint8_t* cmd_msg;
|
|
|
|
/** background write queue, commpoint to write results back */
|
|
struct comm_point* res_com;
|
|
/** are we currently writing a result, 0 if not, else bytecount into
|
|
* the res_list first entry. */
|
|
size_t res_write;
|
|
/** list of outstanding results to be written back */
|
|
struct tube_res_list* res_list;
|
|
/** last in list */
|
|
struct tube_res_list* res_last;
|
|
|
|
#else /* USE_WINSOCK */
|
|
/** listen callback */
|
|
tube_callback_type* listen_cb;
|
|
/** listen callback user arg */
|
|
void* listen_arg;
|
|
/** the windows sockets event (signaled if items in pipe) */
|
|
WSAEVENT event;
|
|
/** winsock event storage when registered with event base */
|
|
struct ub_event* ev_listen;
|
|
|
|
/** lock on the list of outstanding items */
|
|
lock_basic_type res_lock;
|
|
/** list of outstanding results on pipe */
|
|
struct tube_res_list* res_list;
|
|
/** last in list */
|
|
struct tube_res_list* res_last;
|
|
#endif /* USE_WINSOCK */
|
|
};
|
|
|
|
/**
|
|
* List of results (arbitrary command serializations) to write back
|
|
*/
|
|
struct tube_res_list {
|
|
/** next in list */
|
|
struct tube_res_list* next;
|
|
/** serialized buffer to write */
|
|
uint8_t* buf;
|
|
/** length to write */
|
|
uint32_t len;
|
|
};
|
|
|
|
/**
|
|
* Create a pipe
|
|
* @return: new tube struct or NULL on error.
|
|
*/
|
|
struct tube* tube_create(void);
|
|
|
|
/**
|
|
* Delete and destroy a pipe
|
|
* @param tube: to delete
|
|
*/
|
|
void tube_delete(struct tube* tube);
|
|
|
|
/**
|
|
* Write length bytes followed by message.
|
|
* @param tube: the tube to write on.
|
|
* If that tube is a pipe, its write fd is used as
|
|
* the socket to write on. Is nonblocking.
|
|
* Set to blocking by the function,
|
|
* and back to non-blocking at exit of function.
|
|
* @param buf: the message.
|
|
* @param len: length of message.
|
|
* @param nonblock: if set to true, the first write is nonblocking.
|
|
* If the first write fails the function returns -1.
|
|
* If set false, the first write is blocking.
|
|
* @return: all remainder writes are nonblocking.
|
|
* return 0 on error, in that case blocking/nonblocking of socket is
|
|
* unknown.
|
|
* return 1 if all OK.
|
|
*/
|
|
int tube_write_msg(struct tube* tube, uint8_t* buf, uint32_t len,
|
|
int nonblock);
|
|
|
|
/**
|
|
* Read length bytes followed by message.
|
|
* @param tube: The tube to read on.
|
|
* If that tube is a pipe, its read fd is used as
|
|
* the socket to read on. Is nonblocking.
|
|
* Set to blocking by the function,
|
|
* and back to non-blocking at exit of function.
|
|
* @param buf: the message, malloced.
|
|
* @param len: length of message, returned.
|
|
* @param nonblock: if set to true, the first read is nonblocking.
|
|
* If the first read fails the function returns -1.
|
|
* If set false, the first read is blocking.
|
|
* @return: all remainder reads are nonblocking.
|
|
* return 0 on error, in that case blocking/nonblocking of socket is
|
|
* unknown. On EOF 0 is returned.
|
|
* return 1 if all OK.
|
|
*/
|
|
int tube_read_msg(struct tube* tube, uint8_t** buf, uint32_t* len,
|
|
int nonblock);
|
|
|
|
/**
|
|
* Close read part of the pipe.
|
|
* The tube can no longer be read from.
|
|
* @param tube: tube to operate on.
|
|
*/
|
|
void tube_close_read(struct tube* tube);
|
|
|
|
/**
|
|
* Close write part of the pipe.
|
|
* The tube can no longer be written to.
|
|
* @param tube: tube to operate on.
|
|
*/
|
|
void tube_close_write(struct tube* tube);
|
|
|
|
/**
|
|
* See if data is ready for reading on the tube without blocking.
|
|
* @param tube: tube to check for readable items
|
|
* @return true if readable items are present. False if not (or error).
|
|
* true on pipe_closed.
|
|
*/
|
|
int tube_poll(struct tube* tube);
|
|
|
|
/**
|
|
* Wait for data to be ready for reading on the tube. is blocking.
|
|
* No timeout.
|
|
* @param tube: the tube to wait on.
|
|
* @return: if there was something to read (false on error).
|
|
* true on pipe_closed.
|
|
*/
|
|
int tube_wait(struct tube* tube);
|
|
|
|
/**
|
|
* Get FD that is readable when new information arrives.
|
|
* @param tube
|
|
* @return file descriptor.
|
|
*/
|
|
int tube_read_fd(struct tube* tube);
|
|
|
|
/**
|
|
* Start listening for information over the pipe.
|
|
* Background registration of a read listener, callback when read completed.
|
|
* Do not mix with tube_read_msg style direct reads from the pipe.
|
|
* @param tube: tube to listen on
|
|
* @param base: what base to register event callback.
|
|
* @param cb: callback routine.
|
|
* @param arg: user argument for callback routine.
|
|
* @return true if successful, false on error.
|
|
*/
|
|
int tube_setup_bg_listen(struct tube* tube, struct comm_base* base,
|
|
tube_callback_type* cb, void* arg);
|
|
|
|
/**
|
|
* Remove bg listen setup from event base.
|
|
* @param tube: what tube to cleanup
|
|
*/
|
|
void tube_remove_bg_listen(struct tube* tube);
|
|
|
|
/**
|
|
* Start background write handler for the pipe.
|
|
* Do not mix with tube_write_msg style direct writes to the pipe.
|
|
* @param tube: tube to write on
|
|
* @param base: what base to register event handler on.
|
|
* @return true if successful, false on error.
|
|
*/
|
|
int tube_setup_bg_write(struct tube* tube, struct comm_base* base);
|
|
|
|
/**
|
|
* Remove bg write setup from event base.
|
|
* @param tube: what tube to cleanup
|
|
*/
|
|
void tube_remove_bg_write(struct tube* tube);
|
|
|
|
|
|
/**
|
|
* Append data item to background list of writes.
|
|
* Mallocs a list entry behind the scenes.
|
|
* Not locked behind the scenes, call from one thread or lock on outside.
|
|
* @param tube: what tube to queue on.
|
|
* @param msg: memory message to send. Is free()d after use.
|
|
* Put at the end of the to-send queue.
|
|
* @param len: length of item.
|
|
* @return 0 on failure (msg freed).
|
|
*/
|
|
int tube_queue_item(struct tube* tube, uint8_t* msg, size_t len);
|
|
|
|
/** for fptr wlist, callback function */
|
|
int tube_handle_listen(struct comm_point* c, void* arg, int error,
|
|
struct comm_reply* reply_info);
|
|
|
|
/** for fptr wlist, callback function */
|
|
int tube_handle_write(struct comm_point* c, void* arg, int error,
|
|
struct comm_reply* reply_info);
|
|
|
|
/** for fptr wlist, winsock signal event callback function */
|
|
void tube_handle_signal(int fd, short events, void* arg);
|
|
|
|
#endif /* UTIL_TUBE_H */
|