mirror of
https://git.wownero.com/wownero/wownero.git
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728 lines
18 KiB
C
728 lines
18 KiB
C
/*
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* util/tube.c - 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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#include "config.h"
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#include "util/tube.h"
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#include "util/log.h"
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#include "util/net_help.h"
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#include "util/netevent.h"
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#include "util/fptr_wlist.h"
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#ifndef USE_WINSOCK
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/* on unix */
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#ifndef HAVE_SOCKETPAIR
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/** no socketpair() available, like on Minix 3.1.7, use pipe */
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#define socketpair(f, t, p, sv) pipe(sv)
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#endif /* HAVE_SOCKETPAIR */
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struct tube* tube_create(void)
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{
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struct tube* tube = (struct tube*)calloc(1, sizeof(*tube));
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int sv[2];
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if(!tube) {
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int err = errno;
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log_err("tube_create: out of memory");
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errno = err;
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return NULL;
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}
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tube->sr = -1;
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tube->sw = -1;
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if(socketpair(AF_UNIX, SOCK_STREAM, 0, sv) == -1) {
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int err = errno;
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log_err("socketpair: %s", strerror(errno));
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free(tube);
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errno = err;
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return NULL;
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}
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tube->sr = sv[0];
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tube->sw = sv[1];
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if(!fd_set_nonblock(tube->sr) || !fd_set_nonblock(tube->sw)) {
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int err = errno;
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log_err("tube: cannot set nonblocking");
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tube_delete(tube);
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errno = err;
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return NULL;
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}
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return tube;
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}
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void tube_delete(struct tube* tube)
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{
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if(!tube) return;
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tube_remove_bg_listen(tube);
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tube_remove_bg_write(tube);
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/* close fds after deleting commpoints, to be sure.
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* Also epoll does not like closing fd before event_del */
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tube_close_read(tube);
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tube_close_write(tube);
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free(tube);
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}
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void tube_close_read(struct tube* tube)
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{
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if(tube->sr != -1) {
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close(tube->sr);
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tube->sr = -1;
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}
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}
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void tube_close_write(struct tube* tube)
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{
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if(tube->sw != -1) {
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close(tube->sw);
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tube->sw = -1;
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}
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}
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void tube_remove_bg_listen(struct tube* tube)
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{
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if(tube->listen_com) {
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comm_point_delete(tube->listen_com);
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tube->listen_com = NULL;
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}
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if(tube->cmd_msg) {
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free(tube->cmd_msg);
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tube->cmd_msg = NULL;
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}
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}
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void tube_remove_bg_write(struct tube* tube)
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{
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if(tube->res_com) {
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comm_point_delete(tube->res_com);
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tube->res_com = NULL;
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}
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if(tube->res_list) {
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struct tube_res_list* np, *p = tube->res_list;
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tube->res_list = NULL;
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tube->res_last = NULL;
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while(p) {
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np = p->next;
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free(p->buf);
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free(p);
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p = np;
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}
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}
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}
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int
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tube_handle_listen(struct comm_point* c, void* arg, int error,
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struct comm_reply* ATTR_UNUSED(reply_info))
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{
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struct tube* tube = (struct tube*)arg;
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ssize_t r;
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if(error != NETEVENT_NOERROR) {
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fptr_ok(fptr_whitelist_tube_listen(tube->listen_cb));
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(*tube->listen_cb)(tube, NULL, 0, error, tube->listen_arg);
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return 0;
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}
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if(tube->cmd_read < sizeof(tube->cmd_len)) {
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/* complete reading the length of control msg */
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r = read(c->fd, ((uint8_t*)&tube->cmd_len) + tube->cmd_read,
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sizeof(tube->cmd_len) - tube->cmd_read);
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if(r==0) {
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/* error has happened or */
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/* parent closed pipe, must have exited somehow */
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fptr_ok(fptr_whitelist_tube_listen(tube->listen_cb));
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(*tube->listen_cb)(tube, NULL, 0, NETEVENT_CLOSED,
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tube->listen_arg);
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return 0;
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}
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if(r==-1) {
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if(errno != EAGAIN && errno != EINTR) {
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log_err("rpipe error: %s", strerror(errno));
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}
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/* nothing to read now, try later */
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return 0;
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}
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tube->cmd_read += r;
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if(tube->cmd_read < sizeof(tube->cmd_len)) {
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/* not complete, try later */
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return 0;
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}
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tube->cmd_msg = (uint8_t*)calloc(1, tube->cmd_len);
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if(!tube->cmd_msg) {
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log_err("malloc failure");
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tube->cmd_read = 0;
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return 0;
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}
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}
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/* cmd_len has been read, read remainder */
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r = read(c->fd, tube->cmd_msg+tube->cmd_read-sizeof(tube->cmd_len),
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tube->cmd_len - (tube->cmd_read - sizeof(tube->cmd_len)));
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if(r==0) {
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/* error has happened or */
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/* parent closed pipe, must have exited somehow */
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fptr_ok(fptr_whitelist_tube_listen(tube->listen_cb));
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(*tube->listen_cb)(tube, NULL, 0, NETEVENT_CLOSED,
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tube->listen_arg);
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return 0;
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}
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if(r==-1) {
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/* nothing to read now, try later */
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if(errno != EAGAIN && errno != EINTR) {
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log_err("rpipe error: %s", strerror(errno));
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}
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return 0;
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}
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tube->cmd_read += r;
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if(tube->cmd_read < sizeof(tube->cmd_len) + tube->cmd_len) {
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/* not complete, try later */
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return 0;
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}
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tube->cmd_read = 0;
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fptr_ok(fptr_whitelist_tube_listen(tube->listen_cb));
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(*tube->listen_cb)(tube, tube->cmd_msg, tube->cmd_len,
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NETEVENT_NOERROR, tube->listen_arg);
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/* also frees the buf */
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tube->cmd_msg = NULL;
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return 0;
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}
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int
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tube_handle_write(struct comm_point* c, void* arg, int error,
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struct comm_reply* ATTR_UNUSED(reply_info))
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{
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struct tube* tube = (struct tube*)arg;
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struct tube_res_list* item = tube->res_list;
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ssize_t r;
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if(error != NETEVENT_NOERROR) {
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log_err("tube_handle_write net error %d", error);
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return 0;
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}
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if(!item) {
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comm_point_stop_listening(c);
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return 0;
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}
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if(tube->res_write < sizeof(item->len)) {
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r = write(c->fd, ((uint8_t*)&item->len) + tube->res_write,
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sizeof(item->len) - tube->res_write);
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if(r == -1) {
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if(errno != EAGAIN && errno != EINTR) {
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log_err("wpipe error: %s", strerror(errno));
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}
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return 0; /* try again later */
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}
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if(r == 0) {
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/* error on pipe, must have exited somehow */
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/* cannot signal this to pipe user */
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return 0;
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}
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tube->res_write += r;
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if(tube->res_write < sizeof(item->len))
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return 0;
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}
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r = write(c->fd, item->buf + tube->res_write - sizeof(item->len),
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item->len - (tube->res_write - sizeof(item->len)));
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if(r == -1) {
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if(errno != EAGAIN && errno != EINTR) {
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log_err("wpipe error: %s", strerror(errno));
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}
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return 0; /* try again later */
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}
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if(r == 0) {
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/* error on pipe, must have exited somehow */
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/* cannot signal this to pipe user */
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return 0;
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}
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tube->res_write += r;
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if(tube->res_write < sizeof(item->len) + item->len)
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return 0;
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/* done this result, remove it */
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free(item->buf);
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item->buf = NULL;
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tube->res_list = tube->res_list->next;
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free(item);
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if(!tube->res_list) {
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tube->res_last = NULL;
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comm_point_stop_listening(c);
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}
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tube->res_write = 0;
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return 0;
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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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ssize_t r, d;
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int fd = tube->sw;
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/* test */
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if(nonblock) {
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r = write(fd, &len, sizeof(len));
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if(r == -1) {
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if(errno==EINTR || errno==EAGAIN)
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return -1;
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log_err("tube msg write failed: %s", strerror(errno));
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return -1; /* can still continue, perhaps */
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}
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} else r = 0;
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if(!fd_set_block(fd))
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return 0;
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/* write remainder */
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d = r;
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while(d != (ssize_t)sizeof(len)) {
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if((r=write(fd, ((char*)&len)+d, sizeof(len)-d)) == -1) {
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log_err("tube msg write failed: %s", strerror(errno));
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(void)fd_set_nonblock(fd);
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return 0;
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}
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d += r;
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}
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d = 0;
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while(d != (ssize_t)len) {
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if((r=write(fd, buf+d, len-d)) == -1) {
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log_err("tube msg write failed: %s", strerror(errno));
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(void)fd_set_nonblock(fd);
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return 0;
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}
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d += r;
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}
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if(!fd_set_nonblock(fd))
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return 0;
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return 1;
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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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ssize_t r, d;
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int fd = tube->sr;
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/* test */
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*len = 0;
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if(nonblock) {
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r = read(fd, len, sizeof(*len));
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if(r == -1) {
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if(errno==EINTR || errno==EAGAIN)
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return -1;
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log_err("tube msg read failed: %s", strerror(errno));
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return -1; /* we can still continue, perhaps */
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}
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if(r == 0) /* EOF */
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return 0;
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} else r = 0;
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if(!fd_set_block(fd))
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return 0;
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/* read remainder */
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d = r;
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while(d != (ssize_t)sizeof(*len)) {
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if((r=read(fd, ((char*)len)+d, sizeof(*len)-d)) == -1) {
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log_err("tube msg read failed: %s", strerror(errno));
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(void)fd_set_nonblock(fd);
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return 0;
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}
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if(r == 0) /* EOF */ {
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(void)fd_set_nonblock(fd);
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return 0;
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}
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d += r;
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}
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log_assert(*len < 65536*2);
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*buf = (uint8_t*)malloc(*len);
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if(!*buf) {
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log_err("tube read out of memory");
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(void)fd_set_nonblock(fd);
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return 0;
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}
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d = 0;
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while(d < (ssize_t)*len) {
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if((r=read(fd, (*buf)+d, (size_t)((ssize_t)*len)-d)) == -1) {
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log_err("tube msg read failed: %s", strerror(errno));
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(void)fd_set_nonblock(fd);
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free(*buf);
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return 0;
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}
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if(r == 0) { /* EOF */
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(void)fd_set_nonblock(fd);
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free(*buf);
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return 0;
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}
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d += r;
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}
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if(!fd_set_nonblock(fd)) {
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free(*buf);
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return 0;
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}
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return 1;
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}
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/** perform a select() on the fd */
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static int
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pollit(int fd, struct timeval* t)
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{
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fd_set r;
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#ifndef S_SPLINT_S
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FD_ZERO(&r);
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FD_SET(FD_SET_T fd, &r);
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#endif
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if(select(fd+1, &r, NULL, NULL, t) == -1) {
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return 0;
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}
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errno = 0;
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return (int)(FD_ISSET(fd, &r));
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}
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int tube_poll(struct tube* tube)
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{
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struct timeval t;
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memset(&t, 0, sizeof(t));
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return pollit(tube->sr, &t);
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}
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int tube_wait(struct tube* tube)
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{
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return pollit(tube->sr, NULL);
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}
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int tube_read_fd(struct tube* tube)
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{
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return tube->sr;
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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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tube->listen_cb = cb;
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tube->listen_arg = arg;
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if(!(tube->listen_com = comm_point_create_raw(base, tube->sr,
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0, tube_handle_listen, tube))) {
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int err = errno;
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log_err("tube_setup_bg_l: commpoint creation failed");
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errno = err;
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return 0;
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}
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return 1;
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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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if(!(tube->res_com = comm_point_create_raw(base, tube->sw,
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1, tube_handle_write, tube))) {
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int err = errno;
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log_err("tube_setup_bg_w: commpoint creation failed");
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errno = err;
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return 0;
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}
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return 1;
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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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{
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struct tube_res_list* item =
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(struct tube_res_list*)malloc(sizeof(*item));
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if(!item) {
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free(msg);
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log_err("out of memory for async answer");
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return 0;
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}
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item->buf = msg;
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item->len = len;
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item->next = NULL;
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/* add at back of list, since the first one may be partially written */
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if(tube->res_last)
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tube->res_last->next = item;
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else tube->res_list = item;
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tube->res_last = item;
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if(tube->res_list == tube->res_last) {
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/* first added item, start the write process */
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comm_point_start_listening(tube->res_com, -1, -1);
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}
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return 1;
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}
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void tube_handle_signal(int ATTR_UNUSED(fd), short ATTR_UNUSED(events),
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void* ATTR_UNUSED(arg))
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{
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log_assert(0);
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}
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#else /* USE_WINSOCK */
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/* on windows */
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struct tube* tube_create(void)
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{
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/* windows does not have forks like unix, so we only support
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* threads on windows. And thus the pipe need only connect
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* threads. We use a mutex and a list of datagrams. */
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struct tube* tube = (struct tube*)calloc(1, sizeof(*tube));
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if(!tube) {
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int err = errno;
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log_err("tube_create: out of memory");
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errno = err;
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return NULL;
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}
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tube->event = WSACreateEvent();
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if(tube->event == WSA_INVALID_EVENT) {
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free(tube);
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log_err("WSACreateEvent: %s", wsa_strerror(WSAGetLastError()));
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}
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if(!WSAResetEvent(tube->event)) {
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log_err("WSAResetEvent: %s", wsa_strerror(WSAGetLastError()));
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}
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lock_basic_init(&tube->res_lock);
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verbose(VERB_ALGO, "tube created");
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return tube;
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}
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void tube_delete(struct tube* tube)
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{
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if(!tube) return;
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tube_remove_bg_listen(tube);
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tube_remove_bg_write(tube);
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tube_close_read(tube);
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tube_close_write(tube);
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if(!WSACloseEvent(tube->event))
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log_err("WSACloseEvent: %s", wsa_strerror(WSAGetLastError()));
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lock_basic_destroy(&tube->res_lock);
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verbose(VERB_ALGO, "tube deleted");
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free(tube);
|
|
}
|
|
|
|
void tube_close_read(struct tube* ATTR_UNUSED(tube))
|
|
{
|
|
verbose(VERB_ALGO, "tube close_read");
|
|
}
|
|
|
|
void tube_close_write(struct tube* ATTR_UNUSED(tube))
|
|
{
|
|
verbose(VERB_ALGO, "tube close_write");
|
|
/* wake up waiting reader with an empty queue */
|
|
if(!WSASetEvent(tube->event)) {
|
|
log_err("WSASetEvent: %s", wsa_strerror(WSAGetLastError()));
|
|
}
|
|
}
|
|
|
|
void tube_remove_bg_listen(struct tube* tube)
|
|
{
|
|
verbose(VERB_ALGO, "tube remove_bg_listen");
|
|
winsock_unregister_wsaevent(&tube->ev_listen);
|
|
}
|
|
|
|
void tube_remove_bg_write(struct tube* tube)
|
|
{
|
|
verbose(VERB_ALGO, "tube remove_bg_write");
|
|
if(tube->res_list) {
|
|
struct tube_res_list* np, *p = tube->res_list;
|
|
tube->res_list = NULL;
|
|
tube->res_last = NULL;
|
|
while(p) {
|
|
np = p->next;
|
|
free(p->buf);
|
|
free(p);
|
|
p = np;
|
|
}
|
|
}
|
|
}
|
|
|
|
int tube_write_msg(struct tube* tube, uint8_t* buf, uint32_t len,
|
|
int ATTR_UNUSED(nonblock))
|
|
{
|
|
uint8_t* a;
|
|
verbose(VERB_ALGO, "tube write_msg len %d", (int)len);
|
|
a = (uint8_t*)memdup(buf, len);
|
|
if(!a) {
|
|
log_err("out of memory in tube_write_msg");
|
|
return 0;
|
|
}
|
|
/* always nonblocking, this pipe cannot get full */
|
|
return tube_queue_item(tube, a, len);
|
|
}
|
|
|
|
int tube_read_msg(struct tube* tube, uint8_t** buf, uint32_t* len,
|
|
int nonblock)
|
|
{
|
|
struct tube_res_list* item = NULL;
|
|
verbose(VERB_ALGO, "tube read_msg %s", nonblock?"nonblock":"blocking");
|
|
*buf = NULL;
|
|
if(!tube_poll(tube)) {
|
|
verbose(VERB_ALGO, "tube read_msg nodata");
|
|
/* nothing ready right now, wait if we want to */
|
|
if(nonblock)
|
|
return -1; /* would block waiting for items */
|
|
if(!tube_wait(tube))
|
|
return 0;
|
|
}
|
|
lock_basic_lock(&tube->res_lock);
|
|
if(tube->res_list) {
|
|
item = tube->res_list;
|
|
tube->res_list = item->next;
|
|
if(tube->res_last == item) {
|
|
/* the list is now empty */
|
|
tube->res_last = NULL;
|
|
verbose(VERB_ALGO, "tube read_msg lastdata");
|
|
if(!WSAResetEvent(tube->event)) {
|
|
log_err("WSAResetEvent: %s",
|
|
wsa_strerror(WSAGetLastError()));
|
|
}
|
|
}
|
|
}
|
|
lock_basic_unlock(&tube->res_lock);
|
|
if(!item)
|
|
return 0; /* would block waiting for items */
|
|
*buf = item->buf;
|
|
*len = item->len;
|
|
free(item);
|
|
verbose(VERB_ALGO, "tube read_msg len %d", (int)*len);
|
|
return 1;
|
|
}
|
|
|
|
int tube_poll(struct tube* tube)
|
|
{
|
|
struct tube_res_list* item = NULL;
|
|
lock_basic_lock(&tube->res_lock);
|
|
item = tube->res_list;
|
|
lock_basic_unlock(&tube->res_lock);
|
|
if(item)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
int tube_wait(struct tube* tube)
|
|
{
|
|
/* block on eventhandle */
|
|
DWORD res = WSAWaitForMultipleEvents(
|
|
1 /* one event in array */,
|
|
&tube->event /* the event to wait for, our pipe signal */,
|
|
0 /* wait for all events is false */,
|
|
WSA_INFINITE /* wait, no timeout */,
|
|
0 /* we are not alertable for IO completion routines */
|
|
);
|
|
if(res == WSA_WAIT_TIMEOUT) {
|
|
return 0;
|
|
}
|
|
if(res == WSA_WAIT_IO_COMPLETION) {
|
|
/* a bit unexpected, since we were not alertable */
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int tube_read_fd(struct tube* ATTR_UNUSED(tube))
|
|
{
|
|
/* nothing sensible on Windows */
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
tube_handle_listen(struct comm_point* ATTR_UNUSED(c), void* ATTR_UNUSED(arg),
|
|
int ATTR_UNUSED(error), struct comm_reply* ATTR_UNUSED(reply_info))
|
|
{
|
|
log_assert(0);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
tube_handle_write(struct comm_point* ATTR_UNUSED(c), void* ATTR_UNUSED(arg),
|
|
int ATTR_UNUSED(error), struct comm_reply* ATTR_UNUSED(reply_info))
|
|
{
|
|
log_assert(0);
|
|
return 0;
|
|
}
|
|
|
|
int tube_setup_bg_listen(struct tube* tube, struct comm_base* base,
|
|
tube_callback_t* cb, void* arg)
|
|
{
|
|
tube->listen_cb = cb;
|
|
tube->listen_arg = arg;
|
|
if(!comm_base_internal(base))
|
|
return 1; /* ignore when no comm base - testing */
|
|
return winsock_register_wsaevent(comm_base_internal(base),
|
|
&tube->ev_listen, tube->event, &tube_handle_signal, tube);
|
|
}
|
|
|
|
int tube_setup_bg_write(struct tube* ATTR_UNUSED(tube),
|
|
struct comm_base* ATTR_UNUSED(base))
|
|
{
|
|
/* the queue item routine performs the signaling */
|
|
return 1;
|
|
}
|
|
|
|
int tube_queue_item(struct tube* tube, uint8_t* msg, size_t len)
|
|
{
|
|
struct tube_res_list* item =
|
|
(struct tube_res_list*)malloc(sizeof(*item));
|
|
verbose(VERB_ALGO, "tube queue_item len %d", (int)len);
|
|
if(!item) {
|
|
free(msg);
|
|
log_err("out of memory for async answer");
|
|
return 0;
|
|
}
|
|
item->buf = msg;
|
|
item->len = len;
|
|
item->next = NULL;
|
|
lock_basic_lock(&tube->res_lock);
|
|
/* add at back of list, since the first one may be partially written */
|
|
if(tube->res_last)
|
|
tube->res_last->next = item;
|
|
else tube->res_list = item;
|
|
tube->res_last = item;
|
|
/* signal the eventhandle */
|
|
if(!WSASetEvent(tube->event)) {
|
|
log_err("WSASetEvent: %s", wsa_strerror(WSAGetLastError()));
|
|
}
|
|
lock_basic_unlock(&tube->res_lock);
|
|
return 1;
|
|
}
|
|
|
|
void tube_handle_signal(int ATTR_UNUSED(fd), short ATTR_UNUSED(events),
|
|
void* arg)
|
|
{
|
|
struct tube* tube = (struct tube*)arg;
|
|
uint8_t* buf;
|
|
uint32_t len = 0;
|
|
verbose(VERB_ALGO, "tube handle_signal");
|
|
while(tube_poll(tube)) {
|
|
if(tube_read_msg(tube, &buf, &len, 1)) {
|
|
fptr_ok(fptr_whitelist_tube_listen(tube->listen_cb));
|
|
(*tube->listen_cb)(tube, buf, len, NETEVENT_NOERROR,
|
|
tube->listen_arg);
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif /* USE_WINSOCK */
|