//
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// Copyright 2020 Staysail Systems, Inc. <info@staysail.tech>
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// Copyright 2018 Capitar IT Group BV <info@capitar.com>
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// Copyright 2018 Devolutions <info@devolutions.net>
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//
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// This software is supplied under the terms of the MIT License, a
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// copy of which should be located in the distribution where this
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// file was obtained (LICENSE.txt). A copy of the license may also be
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// found online at https://opensource.org/licenses/MIT.
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//
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#include "core/nng_impl.h"
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#include <arpa/inet.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <unistd.h>
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#ifndef SOCK_CLOEXEC
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#define SOCK_CLOEXEC 0
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#endif
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#include "posix_tcp.h"
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struct nni_tcp_listener {
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nni_posix_pfd *pfd;
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nni_list acceptq;
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bool started;
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bool closed;
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bool nodelay;
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bool keepalive;
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nni_mtx mtx;
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};
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int
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nni_tcp_listener_init(nni_tcp_listener **lp)
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{
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nni_tcp_listener *l;
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if ((l = NNI_ALLOC_STRUCT(l)) == NULL) {
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return (NNG_ENOMEM);
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}
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nni_mtx_init(&l->mtx);
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l->pfd = NULL;
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l->closed = false;
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l->started = false;
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nni_aio_list_init(&l->acceptq);
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*lp = l;
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return (0);
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}
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static void
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tcp_listener_doclose(nni_tcp_listener *l)
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{
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nni_aio *aio;
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l->closed = true;
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while ((aio = nni_list_first(&l->acceptq)) != NULL) {
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nni_aio_list_remove(aio);
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nni_aio_finish_error(aio, NNG_ECLOSED);
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}
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if (l->pfd != NULL) {
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nni_posix_pfd_close(l->pfd);
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}
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}
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void
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nni_tcp_listener_close(nni_tcp_listener *l)
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{
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nni_mtx_lock(&l->mtx);
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tcp_listener_doclose(l);
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nni_mtx_unlock(&l->mtx);
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}
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static void
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tcp_listener_doaccept(nni_tcp_listener *l)
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{
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nni_aio *aio;
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while ((aio = nni_list_first(&l->acceptq)) != NULL) {
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int newfd;
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int fd;
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int rv;
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int nd;
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int ka;
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nni_posix_pfd *pfd;
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nni_tcp_conn * c;
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fd = nni_posix_pfd_fd(l->pfd);
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#ifdef NNG_USE_ACCEPT4
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newfd = accept4(fd, NULL, NULL, SOCK_CLOEXEC);
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if ((newfd < 0) && ((errno == ENOSYS) || (errno == ENOTSUP))) {
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newfd = accept(fd, NULL, NULL);
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}
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#else
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newfd = accept(fd, NULL, NULL);
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#endif
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if (newfd < 0) {
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switch (errno) {
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case EAGAIN:
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#ifdef EWOULDBLOCK
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#if EWOULDBLOCK != EAGAIN
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case EWOULDBLOCK:
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#endif
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#endif
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rv = nni_posix_pfd_arm(l->pfd, NNI_POLL_IN);
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if (rv != 0) {
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nni_aio_list_remove(aio);
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nni_aio_finish_error(aio, rv);
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continue;
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}
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// Come back later...
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return;
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case ECONNABORTED:
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case ECONNRESET:
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// Eat them, they aren't interesting.
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continue;
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default:
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// Error this one, but keep moving to the next.
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rv = nni_plat_errno(errno);
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NNI_ASSERT(rv != 0);
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nni_aio_list_remove(aio);
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nni_aio_finish_error(aio, rv);
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continue;
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}
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}
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if ((rv = nni_posix_tcp_alloc(&c, NULL)) != 0) {
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close(newfd);
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nni_aio_list_remove(aio);
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nni_aio_finish_error(aio, rv);
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continue;
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}
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if ((rv = nni_posix_pfd_init(&pfd, newfd)) != 0) {
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close(newfd);
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nng_stream_free(&c->stream);
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nni_aio_list_remove(aio);
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nni_aio_finish_error(aio, rv);
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continue;
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}
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nni_posix_tcp_init(c, pfd);
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ka = l->keepalive ? 1 : 0;
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nd = l->nodelay ? 1 : 0;
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nni_aio_list_remove(aio);
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nni_posix_tcp_start(c, nd, ka);
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nni_aio_set_output(aio, 0, c);
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nni_aio_finish(aio, 0, 0);
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}
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}
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static void
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tcp_listener_cb(nni_posix_pfd *pfd, unsigned events, void *arg)
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{
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nni_tcp_listener *l = arg;
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NNI_ARG_UNUSED(pfd);
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nni_mtx_lock(&l->mtx);
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if ((events & NNI_POLL_INVAL) != 0) {
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tcp_listener_doclose(l);
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nni_mtx_unlock(&l->mtx);
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return;
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}
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// Anything else will turn up in accept.
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tcp_listener_doaccept(l);
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nni_mtx_unlock(&l->mtx);
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}
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static void
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tcp_listener_cancel(nni_aio *aio, void *arg, int rv)
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{
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nni_tcp_listener *l = arg;
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// This is dead easy, because we'll ignore the completion if there
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// isn't anything to do the accept on!
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NNI_ASSERT(rv != 0);
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nni_mtx_lock(&l->mtx);
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if (nni_aio_list_active(aio)) {
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nni_aio_list_remove(aio);
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nni_aio_finish_error(aio, rv);
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}
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nni_mtx_unlock(&l->mtx);
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}
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int
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nni_tcp_listener_listen(nni_tcp_listener *l, const nni_sockaddr *sa)
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{
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socklen_t len;
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struct sockaddr_storage ss;
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int rv;
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int fd;
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nni_posix_pfd * pfd;
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if (((len = nni_posix_nn2sockaddr(&ss, sa)) == 0) ||
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((ss.ss_family != AF_INET) && (ss.ss_family != AF_INET6))) {
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return (NNG_EADDRINVAL);
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}
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nni_mtx_lock(&l->mtx);
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if (l->started) {
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nni_mtx_unlock(&l->mtx);
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return (NNG_ESTATE);
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}
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if (l->closed) {
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nni_mtx_unlock(&l->mtx);
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return (NNG_ECLOSED);
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}
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if ((fd = socket(ss.ss_family, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0) {
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nni_mtx_unlock(&l->mtx);
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return (nni_plat_errno(errno));
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}
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if ((rv = nni_posix_pfd_init(&pfd, fd)) != 0) {
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nni_mtx_unlock(&l->mtx);
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(void) close(fd);
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return (rv);
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}
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// On the Windows Subsystem for Linux, SO_REUSEADDR behaves like Windows
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// SO_REUSEADDR, which is almost completely different (and wrong!) from
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// traditional SO_REUSEADDR.
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#if defined(SO_REUSEADDR) && !defined(NNG_PLATFORM_WSL)
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{
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int on = 1;
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// If for some reason this doesn't work, it's probably ok.
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// Second bind will fail.
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(void) setsockopt(
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fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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}
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#endif
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if (bind(fd, (struct sockaddr *) &ss, len) < 0) {
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rv = nni_plat_errno(errno);
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nni_mtx_unlock(&l->mtx);
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nni_posix_pfd_fini(pfd);
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return (rv);
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}
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// Listen -- 128 depth is probably sufficient. If it isn't, other
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// bad things are going to happen.
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if (listen(fd, 128) != 0) {
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rv = nni_plat_errno(errno);
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nni_mtx_unlock(&l->mtx);
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nni_posix_pfd_fini(pfd);
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return (rv);
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}
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nni_posix_pfd_set_cb(pfd, tcp_listener_cb, l);
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l->pfd = pfd;
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l->started = true;
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nni_mtx_unlock(&l->mtx);
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return (0);
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}
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void
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nni_tcp_listener_fini(nni_tcp_listener *l)
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{
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nni_posix_pfd *pfd;
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nni_mtx_lock(&l->mtx);
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tcp_listener_doclose(l);
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pfd = l->pfd;
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nni_mtx_unlock(&l->mtx);
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if (pfd != NULL) {
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nni_posix_pfd_fini(pfd);
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}
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nni_mtx_fini(&l->mtx);
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NNI_FREE_STRUCT(l);
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}
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void
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nni_tcp_listener_accept(nni_tcp_listener *l, nni_aio *aio)
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{
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int rv;
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// Accept is simpler than the connect case. With accept we just
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// need to wait for the socket to be readable to indicate an incoming
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// connection is ready for us. There isn't anything else for us to
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// do really, as that will have been done in listen.
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if (nni_aio_begin(aio) != 0) {
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return;
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}
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nni_mtx_lock(&l->mtx);
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if (!l->started) {
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nni_mtx_unlock(&l->mtx);
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nni_aio_finish_error(aio, NNG_ESTATE);
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return;
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}
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if (l->closed) {
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nni_mtx_unlock(&l->mtx);
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nni_aio_finish_error(aio, NNG_ECLOSED);
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return;
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}
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if ((rv = nni_aio_schedule(aio, tcp_listener_cancel, l)) != 0) {
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nni_mtx_unlock(&l->mtx);
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nni_aio_finish_error(aio, rv);
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return;
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}
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nni_aio_list_append(&l->acceptq, aio);
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if (nni_list_first(&l->acceptq) == aio) {
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tcp_listener_doaccept(l);
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}
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nni_mtx_unlock(&l->mtx);
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}
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static int
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tcp_listener_get_locaddr(void *arg, void *buf, size_t *szp, nni_type t)
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{
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nni_tcp_listener *l = arg;
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nng_sockaddr sa;
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nni_mtx_lock(&l->mtx);
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if (l->started) {
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struct sockaddr_storage ss;
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socklen_t len = sizeof(ss);
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(void) getsockname(
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nni_posix_pfd_fd(l->pfd), (void *) &ss, &len);
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(void) nni_posix_sockaddr2nn(&sa, &ss, len);
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} else {
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sa.s_family = NNG_AF_UNSPEC;
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}
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nni_mtx_unlock(&l->mtx);
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return (nni_copyout_sockaddr(&sa, buf, szp, t));
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}
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static int
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tcp_listener_set_nodelay(void *arg, const void *buf, size_t sz, nni_type t)
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{
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nni_tcp_listener *l = arg;
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int rv;
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bool b;
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if (((rv = nni_copyin_bool(&b, buf, sz, t)) != 0) || (l == NULL)) {
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return (rv);
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}
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nni_mtx_lock(&l->mtx);
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l->nodelay = b;
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nni_mtx_unlock(&l->mtx);
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return (0);
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}
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static int
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tcp_listener_get_nodelay(void *arg, void *buf, size_t *szp, nni_type t)
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{
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bool b;
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nni_tcp_listener *l = arg;
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nni_mtx_lock(&l->mtx);
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b = l->nodelay;
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nni_mtx_unlock(&l->mtx);
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return (nni_copyout_bool(b, buf, szp, t));
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}
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static int
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tcp_listener_set_keepalive(void *arg, const void *buf, size_t sz, nni_type t)
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{
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nni_tcp_listener *l = arg;
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int rv;
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bool b;
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if (((rv = nni_copyin_bool(&b, buf, sz, t)) != 0) || (l == NULL)) {
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return (rv);
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}
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nni_mtx_lock(&l->mtx);
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l->keepalive = b;
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nni_mtx_unlock(&l->mtx);
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return (0);
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}
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static int
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tcp_listener_get_keepalive(void *arg, void *buf, size_t *szp, nni_type t)
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{
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bool b;
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nni_tcp_listener *l = arg;
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nni_mtx_lock(&l->mtx);
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b = l->keepalive;
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nni_mtx_unlock(&l->mtx);
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return (nni_copyout_bool(b, buf, szp, t));
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}
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static const nni_option tcp_listener_options[] = {
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{
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.o_name = NNG_OPT_LOCADDR,
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.o_get = tcp_listener_get_locaddr,
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},
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{
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.o_name = NNG_OPT_TCP_NODELAY,
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.o_set = tcp_listener_set_nodelay,
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.o_get = tcp_listener_get_nodelay,
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},
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{
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.o_name = NNG_OPT_TCP_KEEPALIVE,
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.o_set = tcp_listener_set_keepalive,
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.o_get = tcp_listener_get_keepalive,
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},
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{
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.o_name = NULL,
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},
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};
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int
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nni_tcp_listener_get(
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nni_tcp_listener *l, const char *name, void *buf, size_t *szp, nni_type t)
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{
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return (nni_getopt(tcp_listener_options, name, l, buf, szp, t));
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}
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int
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nni_tcp_listener_set(nni_tcp_listener *l, const char *name, const void *buf,
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size_t sz, nni_type t)
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{
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return (nni_setopt(tcp_listener_options, name, l, buf, sz, t));
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}
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