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//
// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
// Copyright 2018 Capitar IT Group BV <info@capitar.com>
//
// 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 <ctype.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include "core/nng_impl.h"
#include "supplemental/tls/tls.h"
#include "http.h"
struct nng_http_client {
nni_list aios;
nni_mtx mtx;
bool closed;
nng_tls_config * tls;
nni_aio * connaio;
nni_plat_tcp_ep *tep;
};
static void
http_conn_start(nni_http_client *c)
{
nni_plat_tcp_ep_connect(c->tep, c->connaio);
}
static void
http_conn_done(void *arg)
{
nni_http_client * c = arg;
nni_aio * aio;
int rv;
nni_plat_tcp_pipe *p;
nni_http_conn * conn;
nni_mtx_lock(&c->mtx);
rv = nni_aio_result(c->connaio);
p = rv == 0 ? nni_aio_get_output(c->connaio, 0) : NULL;
if ((aio = nni_list_first(&c->aios)) == NULL) {
if (p != NULL) {
nni_plat_tcp_pipe_fini(p);
}
nni_mtx_unlock(&c->mtx);
return;
}
nni_aio_list_remove(aio);
if (rv != 0) {
nni_aio_finish_error(aio, rv);
nni_mtx_unlock(&c->mtx);
return;
}
if (c->tls != NULL) {
rv = nni_http_conn_init_tls(&conn, c->tls, p);
} else {
rv = nni_http_conn_init_tcp(&conn, p);
}
if (rv != 0) {
nni_aio_finish_error(aio, rv);
nni_mtx_unlock(&c->mtx);
return;
}
nni_aio_set_output(aio, 0, conn);
nni_aio_finish(aio, 0, 0);
if (!nni_list_empty(&c->aios)) {
http_conn_start(c);
}
nni_mtx_unlock(&c->mtx);
}
void
nni_http_client_fini(nni_http_client *c)
{
nni_aio_fini(c->connaio);
nni_plat_tcp_ep_fini(c->tep);
nni_mtx_fini(&c->mtx);
#ifdef NNG_SUPP_TLS
if (c->tls != NULL) {
nni_tls_config_fini(c->tls);
}
#endif
NNI_FREE_STRUCT(c);
}
int
nni_http_client_init(nni_http_client **cp, const nni_url *url)
{
int rv;
nni_http_client *c;
nni_aio * aio;
nni_sockaddr sa;
char * host;
char * port;
if (strlen(url->u_hostname) == 0) {
// We require a valid hostname.
return (NNG_EADDRINVAL);
}
if ((strcmp(url->u_scheme, "http") != 0) &&
#ifdef NNG_SUPP_TLS
(strcmp(url->u_scheme, "https") != 0) &&
(strcmp(url->u_scheme, "wss") != 0) &&
#endif
(strcmp(url->u_scheme, "ws") != 0)) {
return (NNG_EADDRINVAL);
}
// For now we are looking up the address. We would really like
// to do this later, but we need TcP support for this. One
// imagines the ability to create a tcp dialer that does the
// necessary DNS lookups, etc. all asynchronously.
if ((rv = nni_aio_init(&aio, NULL, NULL)) != 0) {
return (rv);
}
nni_aio_set_input(aio, 0, &sa);
host = (strlen(url->u_hostname) != 0) ? url->u_hostname : NULL;
port = (strlen(url->u_port) != 0) ? url->u_port : NULL;
nni_plat_tcp_resolv(host, port, NNG_AF_UNSPEC, false, aio);
nni_aio_wait(aio);
rv = nni_aio_result(aio);
nni_aio_fini(aio);
if (rv != 0) {
return (rv);
}
if ((c = NNI_ALLOC_STRUCT(c)) == NULL) {
return (NNG_ENOMEM);
}
nni_mtx_init(&c->mtx);
nni_aio_list_init(&c->aios);
#ifdef NNG_SUPP_TLS
if ((strcmp(url->u_scheme, "https") == 0) ||
(strcmp(url->u_scheme, "wss") == 0)) {
rv = nni_tls_config_init(&c->tls, NNG_TLS_MODE_CLIENT);
if (rv != 0) {
nni_http_client_fini(c);
return (rv);
}
// Take the server name right from the client URL. We only
// consider the name, as the port is never part of the
// certificate.
rv = nng_tls_config_server_name(c->tls, url->u_hostname);
if (rv != 0) {
nni_http_client_fini(c);
return (rv);
}
// Note that the application has to supply the location of
// certificates. We could probably use a default based
// on environment or common locations used by OpenSSL, but
// as there is no way to *unload* the cert file, lets not
// do that. (We might want to consider a mode to reset.)
}
#endif
rv = nni_plat_tcp_ep_init(&c->tep, NULL, &sa, NNI_EP_MODE_DIAL);
if (rv != 0) {
nni_http_client_fini(c);
return (rv);
}
if ((rv = nni_aio_init(&c->connaio, http_conn_done, c)) != 0) {
nni_http_client_fini(c);
return (rv);
}
*cp = c;
return (0);
}
int
nni_http_client_set_tls(nni_http_client *c, nng_tls_config *tls)
{
#ifdef NNG_SUPP_TLS
nng_tls_config *old;
nni_mtx_lock(&c->mtx);
old = c->tls;
c->tls = tls;
if (tls != NULL) {
nni_tls_config_hold(tls);
}
nni_mtx_unlock(&c->mtx);
if (old != NULL) {
nni_tls_config_fini(old);
}
return (0);
#else
NNI_ARG_UNUSED(c);
NNI_ARG_UNUSED(tls);
return (NNG_EINVAL);
#endif
}
int
nni_http_client_get_tls(nni_http_client *c, nng_tls_config **tlsp)
{
#ifdef NNG_SUPP_TLS
nni_mtx_lock(&c->mtx);
if (c->tls == NULL) {
nni_mtx_unlock(&c->mtx);
return (NNG_EINVAL);
}
*tlsp = c->tls;
nni_mtx_unlock(&c->mtx);
return (0);
#else
NNI_ARG_UNUSED(c);
NNI_ARG_UNUSED(tlsp);
return (NNG_ENOTSUP);
#endif
}
static void
http_connect_cancel(nni_aio *aio, int rv)
{
nni_http_client *c = nni_aio_get_prov_data(aio);
nni_mtx_lock(&c->mtx);
if (nni_aio_list_active(aio)) {
nni_aio_list_remove(aio);
nni_aio_finish_error(aio, rv);
}
if (nni_list_empty(&c->aios)) {
nni_aio_abort(c->connaio, rv);
}
nni_mtx_unlock(&c->mtx);
}
void
nni_http_client_connect(nni_http_client *c, nni_aio *aio)
{
if (nni_aio_start(aio, http_connect_cancel, aio) != 0) {
return;
}
nni_mtx_lock(&c->mtx);
nni_list_append(&c->aios, aio);
if (nni_list_first(&c->aios) == aio) {
http_conn_start(c);
}
nni_mtx_unlock(&c->mtx);
}
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