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//
// Copyright 2019 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 "core/nng_impl.h"
#ifdef NNG_TRANSPORT_INPROC
#include "nng/transport/inproc/inproc.h"
#endif
#ifdef NNG_TRANSPORT_IPC
#include "nng/transport/ipc/ipc.h"
#endif
#ifdef NNG_TRANSPORT_TCP
#include "nng/transport/tcp/tcp.h"
#endif
#ifdef NNG_TRANSPORT_TLS
#include "nng/transport/tls/tls.h"
#endif
#ifdef NNG_TRANSPORT_WS
#include "nng/transport/ws/websocket.h"
#endif
#ifdef NNG_TRANSPORT_ZEROTIER
#include "nng/transport/zerotier/zerotier.h"
#endif
#include <stdio.h>
#include <string.h>
// For now the list of transports is hard-wired. Adding new transports
// to the system dynamically is something that might be considered later.
extern nni_tran nni_tcp_tran;
extern nni_tran nni_ipc_tran;
typedef struct nni_transport {
nni_tran t_tran;
nni_list_node t_node;
} nni_transport;
static nni_list nni_tran_list;
static nni_mtx nni_tran_lk;
static int nni_tran_inited;
int
nni_tran_register(const nni_tran *tran)
{
nni_transport *t;
int rv;
// Its entirely possible that we are called before any sockets
// are opened. Make sure we are initialized. This has to be
// protected by a guard to prevent infinite recursion, since
// nni_init also winds up calling us.
if (!nni_tran_inited) {
nni_init();
}
if (tran->tran_version != NNI_TRANSPORT_VERSION) {
return (NNG_ENOTSUP);
}
nni_mtx_lock(&nni_tran_lk);
// Check to see if the transport is already registered...
NNI_LIST_FOREACH (&nni_tran_list, t) {
if (strcmp(tran->tran_scheme, t->t_tran.tran_scheme) == 0) {
if (tran->tran_init == t->t_tran.tran_init) {
// duplicate.
nni_mtx_unlock(&nni_tran_lk);
return (0);
}
nni_mtx_unlock(&nni_tran_lk);
return (NNG_ESTATE);
}
}
if ((t = NNI_ALLOC_STRUCT(t)) == NULL) {
nni_mtx_unlock(&nni_tran_lk);
return (NNG_ENOMEM);
}
t->t_tran = *tran;
if ((rv = t->t_tran.tran_init()) != 0) {
nni_mtx_unlock(&nni_tran_lk);
NNI_FREE_STRUCT(t);
return (rv);
}
nni_list_append(&nni_tran_list, t);
nni_mtx_unlock(&nni_tran_lk);
return (0);
}
nni_tran *
nni_tran_find(nni_url *url)
{
// address is of the form "<scheme>://blah..."
nni_transport *t;
nni_mtx_lock(&nni_tran_lk);
NNI_LIST_FOREACH (&nni_tran_list, t) {
if (strcmp(url->u_scheme, t->t_tran.tran_scheme) == 0) {
nni_mtx_unlock(&nni_tran_lk);
return (&t->t_tran);
}
}
nni_mtx_unlock(&nni_tran_lk);
return (NULL);
}
int
nni_tran_chkopt(const char *name, const void *v, size_t sz, int typ)
{
nni_transport *t;
int rv = NNG_ENOTSUP;
nni_mtx_lock(&nni_tran_lk);
NNI_LIST_FOREACH (&nni_tran_list, t) {
const nni_tran_dialer_ops * dops;
const nni_tran_listener_ops *lops;
const nni_option * o;
// Check option entry point is cleaner than endpoint hacks.
if (t->t_tran.tran_checkopt != NULL) {
rv = t->t_tran.tran_checkopt(name, v, sz, typ);
if (rv != NNG_ENOTSUP) {
nni_mtx_unlock(&nni_tran_lk);
return (rv);
}
continue;
}
// Generally we look for endpoint options. We check both
// dialers and listeners.
dops = t->t_tran.tran_dialer;
if ((dops->d_setopt != NULL) &&
((rv = dops->d_setopt(NULL, name, v, sz, typ)) !=
NNG_ENOTSUP)) {
nni_mtx_unlock(&nni_tran_lk);
return (rv);
}
for (o = dops->d_options; o && o->o_name != NULL; o++) {
if (strcmp(name, o->o_name) != 0) {
continue;
}
if (o->o_set == NULL) {
nni_mtx_unlock(&nni_tran_lk);
return (NNG_EREADONLY);
}
nni_mtx_unlock(&nni_tran_lk);
rv = o->o_set(NULL, v, sz, typ);
return (rv);
}
lops = t->t_tran.tran_listener;
if ((lops->l_setopt != NULL) &&
((rv = lops->l_setopt(NULL, name, v, sz, typ)) !=
NNG_ENOTSUP)) {
nni_mtx_unlock(&nni_tran_lk);
return (rv);
}
for (o = lops->l_options; o && o->o_name != NULL; o++) {
if (strcmp(name, o->o_name) != 0) {
continue;
}
if (o->o_set == NULL) {
nni_mtx_unlock(&nni_tran_lk);
return (NNG_EREADONLY);
}
nni_mtx_unlock(&nni_tran_lk);
rv = o->o_set(NULL, v, sz, typ);
return (rv);
}
}
nni_mtx_unlock(&nni_tran_lk);
return (rv);
}
// nni_tran_sys_init initializes the entire transport subsystem, including
// each individual transport.
typedef int (*nni_tran_ctor)(void);
// These are just the statically compiled in constructors.
// In the future we might want to support dynamic additions.
static nni_tran_ctor nni_tran_ctors[] = {
#ifdef NNG_TRANSPORT_INPROC
nng_inproc_register,
#endif
#ifdef NNG_TRANSPORT_IPC
nng_ipc_register,
#endif
#ifdef NNG_TRANSPORT_TCP
nng_tcp_register,
#endif
#ifdef NNG_TRANSPORT_TLS
nng_tls_register,
#endif
#ifdef NNG_TRANSPORT_WS
nng_ws_register,
#endif
#ifdef NNG_TRANSPORT_WSS
nng_wss_register,
#endif
#ifdef NNG_TRANSPORT_ZEROTIER
nng_zt_register,
#endif
NULL,
};
int
nni_tran_sys_init(void)
{
int i;
nni_tran_inited = 1;
NNI_LIST_INIT(&nni_tran_list, nni_transport, t_node);
nni_mtx_init(&nni_tran_lk);
for (i = 0; nni_tran_ctors[i] != NULL; i++) {
int rv;
if ((rv = (nni_tran_ctors[i])()) != 0) {
nni_tran_sys_fini();
return (rv);
}
}
return (0);
}
// nni_tran_sys_fini finalizes the entire transport system, including all
// transports.
void
nni_tran_sys_fini(void)
{
nni_transport *t;
while ((t = nni_list_first(&nni_tran_list)) != NULL) {
nni_list_remove(&nni_tran_list, t);
t->t_tran.tran_fini();
NNI_FREE_STRUCT(t);
}
nni_mtx_fini(&nni_tran_lk);
nni_tran_inited = 0;
}
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