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//
// Copyright 2025 Staysail Systems, Inc. <info@staysail.tech>
// Copyright 2018 Capitar IT Group BV <info@capitar.com>
// Copyright 2019 Devolutions <info@devolutions.net>
//
// This software is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "core/nng_impl.h"
#include "tls_common.h"
#include "tls_engine.h"
#include "tls_stream.h"
typedef struct {
nng_stream_dialer ops;
nng_stream_dialer *d; // underlying TCP dialer
nng_tls_config *cfg;
bool started;
nni_mtx lk; // protects the config
} tls_dialer;
static void
tls_dialer_close(void *arg)
{
tls_dialer *d = arg;
nng_stream_dialer_close(d->d);
}
static void
tls_dialer_free(void *arg)
{
tls_dialer *d;
if ((d = arg) != NULL) {
nng_stream_dialer_free(d->d);
nng_tls_config_free(d->cfg);
nni_mtx_fini(&d->lk);
NNI_FREE_STRUCT(d);
}
}
static void
tls_dialer_stop(void *arg)
{
tls_dialer *d = arg;
nng_stream_dialer_stop(d->d);
}
// Dialer cancel is called when the user has indicated that they no longer
// want to wait for the connection to establish.
static void
tls_dialer_cancel(nni_aio *aio, void *arg, nng_err rv)
{
tls_stream *ts = arg;
NNI_ARG_UNUSED(aio);
// Just pass this down. If the connection is already done, this
// will have no effect.
nni_aio_abort(&ts->conn_aio, rv);
}
static void
tls_dialer_dial(void *arg, nng_aio *aio)
{
tls_dialer *d = arg;
tls_stream *ts;
int rv;
nni_aio_reset(aio);
if ((rv = nni_tls_stream_alloc(&ts, d->cfg, aio)) != 0) {
nni_aio_finish_error(aio, rv);
return;
}
if (!nni_aio_start(aio, tls_dialer_cancel, ts)) {
nni_tls_stream_free(ts);
return;
}
nni_mtx_lock(&d->lk);
d->started = true;
nni_mtx_unlock(&d->lk);
nng_stream_dialer_dial(d->d, &ts->conn_aio);
}
static int
tls_dialer_set_tls(void *arg, nng_tls_config *cfg)
{
tls_dialer *d = arg;
nng_tls_config *old;
if (cfg == NULL) {
return (NNG_EINVAL);
}
nng_tls_config_hold(cfg);
nni_mtx_lock(&d->lk);
if (d->started) {
nni_mtx_unlock(&d->lk);
nng_tls_config_free(cfg);
return (NNG_EBUSY);
}
old = d->cfg;
d->cfg = cfg;
nni_mtx_unlock(&d->lk);
nng_tls_config_free(old);
return (0);
}
static int
tls_dialer_get_tls(void *arg, nng_tls_config **cfg)
{
tls_dialer *d = arg;
nni_mtx_lock(&d->lk);
*cfg = d->cfg;
nni_mtx_unlock(&d->lk);
return (0);
}
static int
tls_dialer_get(void *arg, const char *name, void *buf, size_t *szp, nni_type t)
{
tls_dialer *d = arg;
return (nni_stream_dialer_get(d->d, name, buf, szp, t));
}
static int
tls_dialer_set(
void *arg, const char *name, const void *buf, size_t sz, nni_type t)
{
tls_dialer *d = arg;
return (nni_stream_dialer_set(d->d, name, buf, sz, t));
}
nng_err
nni_tls_dialer_alloc(nng_stream_dialer **dp, const nng_url *url)
{
tls_dialer *d;
nng_err rv;
nng_url my_url;
memcpy(&my_url, url, sizeof(my_url));
if (strncmp(my_url.u_scheme, "tls+", 4) == 0) {
my_url.u_scheme += 4;
}
if ((d = NNI_ALLOC_STRUCT(d)) == NULL) {
return (NNG_ENOMEM);
}
nni_mtx_init(&d->lk);
if ((rv = nng_stream_dialer_alloc_url(&d->d, &my_url)) != NNG_OK) {
nni_mtx_fini(&d->lk);
NNI_FREE_STRUCT(d);
return (rv);
}
if ((rv = nng_tls_config_alloc(&d->cfg, NNG_TLS_MODE_CLIENT)) !=
NNG_OK) {
nng_stream_dialer_free(d->d);
nni_mtx_fini(&d->lk);
NNI_FREE_STRUCT(d);
return (rv);
}
// Set the expected outbound hostname
nng_tls_config_server_name(d->cfg, url->u_hostname);
d->ops.sd_close = tls_dialer_close;
d->ops.sd_free = tls_dialer_free;
d->ops.sd_stop = tls_dialer_stop;
d->ops.sd_dial = tls_dialer_dial;
d->ops.sd_get = tls_dialer_get;
d->ops.sd_set = tls_dialer_set;
d->ops.sd_get_tls = tls_dialer_get_tls;
d->ops.sd_set_tls = tls_dialer_set_tls;
*dp = (void *) d;
return (rv);
}
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