//
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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 "win_tcp.h"
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#include <malloc.h>
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#include <stdio.h>
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struct nni_tcp_dialer {
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LPFN_CONNECTEX connectex; // looked up name via ioctl
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nni_list aios; // in flight connections
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bool closed;
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bool nodelay; // initial value for child conns
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bool keepalive; // initial value for child conns
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SOCKADDR_STORAGE src; // source address
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size_t srclen;
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nni_mtx mtx;
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nni_reap_node reap;
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};
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int
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nni_tcp_dialer_init(nni_tcp_dialer **dp)
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{
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nni_tcp_dialer *d;
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int rv;
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SOCKET s;
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DWORD nbytes;
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GUID guid = WSAID_CONNECTEX;
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if ((d = NNI_ALLOC_STRUCT(d)) == NULL) {
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return (NNG_ENOMEM);
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}
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ZeroMemory(d, sizeof(*d));
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nni_mtx_init(&d->mtx);
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nni_aio_list_init(&d->aios);
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// Create a scratch socket for use with ioctl.
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s = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
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if (s == INVALID_SOCKET) {
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rv = nni_win_error(GetLastError());
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nni_tcp_dialer_fini(d);
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return (rv);
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}
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// Look up the function pointer.
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if (WSAIoctl(s, SIO_GET_EXTENSION_FUNCTION_POINTER, &guid,
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sizeof(guid), &d->connectex, sizeof(d->connectex), &nbytes,
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NULL, NULL) == SOCKET_ERROR) {
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rv = nni_win_error(GetLastError());
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closesocket(s);
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nni_tcp_dialer_fini(d);
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return (rv);
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}
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closesocket(s);
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*dp = d;
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return (0);
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}
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void
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nni_tcp_dialer_close(nni_tcp_dialer *d)
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{
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nni_mtx_lock(&d->mtx);
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if (!d->closed) {
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nni_aio *aio;
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d->closed = true;
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NNI_LIST_FOREACH (&d->aios, aio) {
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nni_tcp_conn *c;
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if ((c = nni_aio_get_prov_extra(aio, 0)) != NULL) {
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c->conn_rv = NNG_ECLOSED;
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CancelIoEx((HANDLE) c->s, &c->conn_io.olpd);
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}
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}
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}
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nni_mtx_unlock(&d->mtx);
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}
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static nni_reap_list tcp_dialer_reap_list = {
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.rl_offset = offsetof(nni_tcp_dialer, reap),
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.rl_func = (nni_cb) nni_tcp_dialer_fini,
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};
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void
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nni_tcp_dialer_fini(nni_tcp_dialer *d)
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{
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nni_tcp_dialer_close(d);
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nni_mtx_lock(&d->mtx);
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if (!nni_list_empty(&d->aios)) {
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nni_mtx_unlock(&d->mtx);
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nni_reap(&tcp_dialer_reap_list, nni_tcp_dialer_fini);
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return;
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}
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nni_mtx_unlock(&d->mtx);
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nni_mtx_fini(&d->mtx);
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NNI_FREE_STRUCT(d);
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}
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static void
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tcp_dial_cancel(nni_aio *aio, void *arg, int rv)
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{
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nni_tcp_dialer *d = arg;
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nni_tcp_conn * c;
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nni_mtx_lock(&d->mtx);
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if ((c = nni_aio_get_prov_extra(aio, 0)) != NULL) {
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if (c->conn_rv == 0) {
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c->conn_rv = rv;
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}
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CancelIoEx((HANDLE) c->s, &c->conn_io.olpd);
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}
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nni_mtx_unlock(&d->mtx);
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}
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static void
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tcp_dial_cb(nni_win_io *io, int rv, size_t cnt)
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{
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nni_tcp_conn * c = io->ptr;
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nni_tcp_dialer *d = c->dialer;
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nni_aio * aio = c->conn_aio;
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BOOL ka;
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BOOL nd;
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NNI_ARG_UNUSED(cnt);
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nni_mtx_lock(&d->mtx);
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if ((aio = c->conn_aio) == NULL) {
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// This should never occur.
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nni_mtx_unlock(&d->mtx);
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return;
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}
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c->conn_aio = NULL;
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nni_aio_set_prov_extra(aio, 0, NULL);
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nni_aio_list_remove(aio);
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if (c->conn_rv != 0) {
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rv = c->conn_rv;
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}
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nd = d->nodelay ? TRUE : FALSE;
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ka = d->keepalive ? TRUE : FALSE;
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nni_mtx_unlock(&d->mtx);
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if (rv != 0) {
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nng_stream_free(&c->ops);
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nni_aio_finish_error(aio, rv);
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} else {
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DWORD yes = 1;
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int len;
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(void) setsockopt(c->s, SOL_SOCKET, SO_UPDATE_CONNECT_CONTEXT,
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(char *) &yes, sizeof(yes));
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(void) setsockopt(
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c->s, SOL_SOCKET, SO_KEEPALIVE, (char *) &ka, sizeof(ka));
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(void) setsockopt(
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c->s, IPPROTO_TCP, TCP_NODELAY, (char *) &nd, sizeof(nd));
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len = sizeof(SOCKADDR_STORAGE);
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(void) getsockname(c->s, (SOCKADDR *) &c->sockname, &len);
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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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void
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nni_tcp_dial(nni_tcp_dialer *d, const nni_sockaddr *sa, nni_aio *aio)
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{
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SOCKET s;
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SOCKADDR_STORAGE ss;
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int len;
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nni_tcp_conn * c;
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int rv;
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if (nni_aio_begin(aio) != 0) {
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return;
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}
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if ((len = nni_win_nn2sockaddr(&ss, sa)) <= 0) {
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nni_aio_finish_error(aio, NNG_EADDRINVAL);
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return;
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}
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if ((s = socket(ss.ss_family, SOCK_STREAM, 0)) == INVALID_SOCKET) {
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nni_aio_finish_error(aio, nni_win_error(GetLastError()));
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return;
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}
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if ((rv = nni_win_tcp_init(&c, s)) != 0) {
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nng_stream_free(&c->ops);
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nni_aio_finish_error(aio, rv);
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return;
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}
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c->peername = ss;
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if ((rv = nni_win_io_init(&c->conn_io, tcp_dial_cb, c)) != 0) {
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nni_aio_finish_error(aio, rv);
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return;
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}
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nni_mtx_lock(&d->mtx);
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if (d->closed) {
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nni_mtx_unlock(&d->mtx);
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nng_stream_free(&c->ops);
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nni_aio_finish_error(aio, NNG_ECLOSED);
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return;
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}
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// Windows ConnectEx requires the socket to be bound
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// first. We just bind to an ephemeral address in the
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// same family, unless a different default was requested.
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if (d->srclen != 0) {
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len = (int) d->srclen;
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memcpy(&c->sockname, &d->src, len);
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} else {
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ZeroMemory(&c->sockname, sizeof(c->sockname));
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c->sockname.ss_family = ss.ss_family;
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}
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if (bind(s, (SOCKADDR *) &c->sockname, len) != 0) {
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rv = nni_win_error(GetLastError());
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nni_mtx_unlock(&d->mtx);
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nng_stream_free(&c->ops);
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nni_aio_finish_error(aio, rv);
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return;
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}
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c->dialer = d;
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nni_aio_set_prov_extra(aio, 0, c);
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if ((rv = nni_aio_schedule(aio, tcp_dial_cancel, d)) != 0) {
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nni_mtx_unlock(&d->mtx);
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nng_stream_free(&c->ops);
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nni_aio_finish_error(aio, rv);
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return;
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}
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c->conn_aio = aio;
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nni_aio_list_append(&d->aios, aio);
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// dialing is concurrent.
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if (!d->connectex(s, (struct sockaddr *) &c->peername, len, NULL, 0,
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NULL, &c->conn_io.olpd)) {
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if ((rv = GetLastError()) != ERROR_IO_PENDING) {
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nni_aio_list_remove(aio);
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nni_mtx_unlock(&d->mtx);
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nng_stream_free(&c->ops);
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nni_aio_finish_error(aio, rv);
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return;
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}
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}
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nni_mtx_unlock(&d->mtx);
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}
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static int
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tcp_dialer_set_nodelay(void *arg, const void *buf, size_t sz, nni_type t)
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{
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nni_tcp_dialer *d = 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) || (d == NULL)) {
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return (rv);
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}
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nni_mtx_lock(&d->mtx);
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d->nodelay = b;
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nni_mtx_unlock(&d->mtx);
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return (0);
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}
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static int
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tcp_dialer_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_dialer *d = arg;
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nni_mtx_lock(&d->mtx);
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b = d->nodelay;
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nni_mtx_unlock(&d->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_dialer_set_keepalive(void *arg, const void *buf, size_t sz, nni_type t)
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{
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nni_tcp_dialer *d = 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) || (d == NULL)) {
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return (rv);
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}
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nni_mtx_lock(&d->mtx);
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d->keepalive = b;
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nni_mtx_unlock(&d->mtx);
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return (0);
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}
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static int
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tcp_dialer_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_dialer *d = arg;
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nni_mtx_lock(&d->mtx);
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b = d->keepalive;
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nni_mtx_unlock(&d->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_dialer_get_locaddr(void *arg, void *buf, size_t *szp, nni_type t)
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{
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nni_tcp_dialer *d = arg;
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nng_sockaddr sa;
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nni_mtx_lock(&d->mtx);
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if (nni_win_sockaddr2nn(&sa, &d->src) != 0) {
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sa.s_family = NNG_AF_UNSPEC;
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}
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nni_mtx_unlock(&d->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_dialer_set_locaddr(void *arg, const void *buf, size_t sz, nni_type t)
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{
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nni_tcp_dialer * d = arg;
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nng_sockaddr sa;
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SOCKADDR_STORAGE ss;
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struct sockaddr_in * sin;
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struct sockaddr_in6 *sin6;
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size_t sslen;
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int rv;
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if ((rv = nni_copyin_sockaddr(&sa, buf, sz, t)) != 0) {
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return (rv);
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}
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if ((sslen = nni_win_nn2sockaddr(&ss, &sa)) == 0) {
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return (NNG_EADDRINVAL);
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}
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// Ensure we are either IPv4 or IPv6, and port is not set. (We
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// do not allow binding to a specific port.)
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switch (ss.ss_family) {
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case AF_INET:
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sin = (void *) &ss;
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if (sin->sin_port != 0) {
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return (NNG_EADDRINVAL);
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}
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break;
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case AF_INET6:
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sin6 = (void *) &ss;
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if (sin6->sin6_port != 0) {
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return (NNG_EADDRINVAL);
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}
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break;
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default:
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return (NNG_EADDRINVAL);
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}
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if (d != NULL) {
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nni_mtx_lock(&d->mtx);
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if (d->closed) {
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nni_mtx_unlock(&d->mtx);
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return (NNG_ECLOSED);
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}
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d->src = ss;
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d->srclen = sslen;
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nni_mtx_unlock(&d->mtx);
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}
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return (0);
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}
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static const nni_option tcp_dialer_options[] = {
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{
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.o_name = NNG_OPT_LOCADDR,
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.o_get = tcp_dialer_get_locaddr,
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.o_set = tcp_dialer_set_locaddr,
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},
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{
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.o_name = NNG_OPT_TCP_NODELAY,
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.o_get = tcp_dialer_get_nodelay,
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.o_set = tcp_dialer_set_nodelay,
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},
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{
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.o_name = NNG_OPT_TCP_KEEPALIVE,
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.o_get = tcp_dialer_get_keepalive,
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.o_set = tcp_dialer_set_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_dialer_get(
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nni_tcp_dialer *d, const char *name, void *buf, size_t *szp, nni_type t)
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{
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return (nni_getopt(tcp_dialer_options, name, d, buf, szp, t));
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}
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int
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nni_tcp_dialer_set(nni_tcp_dialer *d, 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_dialer_options, name, d, buf, sz, t));
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}
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