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/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010 - 2020 Andy Green <andy@warmcat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <private-lib-core.h>
static int
rops_handle_POLLIN_raw_skt(struct lws_context_per_thread *pt, struct lws *wsi,
struct lws_pollfd *pollfd)
{
#if defined(LWS_WITH_SOCKS5)
const char *cce = NULL;
#endif
struct lws_tokens ebuf;
int n = 0, buffered = 0;
/* pending truncated sends have uber priority */
if (lws_has_buffered_out(wsi)) {
if (!(pollfd->revents & LWS_POLLOUT))
return LWS_HPI_RET_HANDLED;
/* drain the output buflist */
if (lws_issue_raw(wsi, NULL, 0) < 0)
goto fail;
/*
* we can't afford to allow input processing to send
* something new, so spin around he event loop until
* he doesn't have any partials
*/
return LWS_HPI_RET_HANDLED;
}
#if defined(LWS_WITH_SERVER)
if (!lwsi_role_client(wsi) && lwsi_state(wsi) != LRS_ESTABLISHED) {
lwsl_wsi_debug(wsi, "wsistate 0x%x\n", (int)wsi->wsistate);
if (lwsi_state(wsi) != LRS_SSL_INIT)
if (lws_server_socket_service_ssl(wsi,
LWS_SOCK_INVALID,
!!(pollfd->revents & pollfd->events & LWS_POLLIN)))
return LWS_HPI_RET_PLEASE_CLOSE_ME;
return LWS_HPI_RET_HANDLED;
}
#endif
if ((pollfd->revents & pollfd->events & LWS_POLLIN) &&
!(wsi->favoured_pollin &&
(pollfd->revents & pollfd->events & LWS_POLLOUT))) {
lwsl_wsi_debug(wsi, "POLLIN: state 0x%x", lwsi_state(wsi));
switch (lwsi_state(wsi)) {
/* any tunnel has to have been established... */
case LRS_SSL_ACK_PENDING:
goto nope;
/* we are actually connected */
case LRS_WAITING_CONNECT:
goto nope;
#if defined(LWS_WITH_SOCKS5)
/* SOCKS Greeting Reply */
case LRS_WAITING_SOCKS_GREETING_REPLY:
case LRS_WAITING_SOCKS_AUTH_REPLY:
case LRS_WAITING_SOCKS_CONNECT_REPLY:
switch (lws_socks5c_handle_state(wsi, pollfd, &cce)) {
case LW5CHS_RET_RET0:
goto nope;
case LW5CHS_RET_BAIL3:
lws_inform_client_conn_fail(wsi, (void *)cce, strlen(cce));
goto fail;
case LW5CHS_RET_STARTHS:
lwsi_set_state(wsi, LRS_ESTABLISHED);
lws_client_connect_4_established(wsi, NULL, 0);
/*
* Now we got the socks5 connection, we need to
* go down the tls path on it now if that's what
* we want
*/
goto post_rx;
default:
break;
}
goto post_rx;
#endif
default:
ebuf.token = NULL;
ebuf.len = 0;
buffered = lws_buflist_aware_read(pt, wsi, &ebuf, 1, __func__);
switch (ebuf.len) {
case 0:
if (wsi->unix_skt)
break;
lwsl_wsi_info(wsi, "read 0 len");
wsi->seen_zero_length_recv = 1;
if (lws_change_pollfd(wsi, LWS_POLLIN, 0))
goto fail;
/*
* we need to go to fail here, since it's the only
* chance we get to understand that the socket has
* closed
*/
// goto try_pollout;
goto fail;
case LWS_SSL_CAPABLE_ERROR:
goto fail;
case LWS_SSL_CAPABLE_MORE_SERVICE:
goto try_pollout;
}
#if defined(LWS_WITH_UDP)
if (lws_fi(&wsi->fic, "udp_rx_loss")) {
n = ebuf.len;
goto post_rx;
}
#endif
n = user_callback_handle_rxflow(wsi->a.protocol->callback,
wsi, LWS_CALLBACK_RAW_RX,
wsi->user_space, ebuf.token,
(unsigned int)ebuf.len);
#if defined(LWS_WITH_UDP) || defined(LWS_WITH_SOCKS5)
post_rx:
#endif
if (n < 0) {
lwsl_wsi_info(wsi, "LWS_CALLBACK_RAW_RX_fail");
goto fail;
}
if (lws_buflist_aware_finished_consuming(wsi, &ebuf, ebuf.len,
buffered, __func__))
return LWS_HPI_RET_PLEASE_CLOSE_ME;
goto try_pollout;
}
}
nope:
if (wsi->favoured_pollin &&
(pollfd->revents & pollfd->events & LWS_POLLOUT))
/* we balanced the last favouring of pollin */
wsi->favoured_pollin = 0;
try_pollout:
if (!(pollfd->revents & LWS_POLLOUT))
return LWS_HPI_RET_HANDLED;
#if defined(LWS_WITH_CLIENT)
if (lwsi_state(wsi) == LRS_WAITING_CONNECT &&
!lws_client_connect_3_connect(wsi, NULL, NULL, 0, NULL))
return LWS_HPI_RET_WSI_ALREADY_DIED;
#endif
/* one shot */
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
lwsl_notice("%s a\n", __func__);
goto fail;
}
/* clear back-to-back write detection */
wsi->could_have_pending = 0;
n = user_callback_handle_rxflow(wsi->a.protocol->callback,
wsi, LWS_CALLBACK_RAW_WRITEABLE,
wsi->user_space, NULL, 0);
if (n < 0) {
lwsl_info("writeable_fail\n");
goto fail;
}
return LWS_HPI_RET_HANDLED;
fail:
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS, "raw svc fail");
return LWS_HPI_RET_WSI_ALREADY_DIED;
}
#if defined(LWS_WITH_SERVER)
static int
rops_adoption_bind_raw_skt(struct lws *wsi, int type, const char *vh_prot_name)
{
// lwsl_notice("%s: bind type %d\n", __func__, type);
/* no http but socket... must be raw skt */
if ((type & LWS_ADOPT_HTTP) || !(type & LWS_ADOPT_SOCKET) ||
((type & _LWS_ADOPT_FINISH) && (!(type & LWS_ADOPT_FLAG_UDP))))
return 0; /* no match */
#if defined(LWS_WITH_UDP)
if ((type & LWS_ADOPT_FLAG_UDP) && !wsi->udp) {
/*
* these can be >128 bytes, so just alloc for UDP
*/
wsi->udp = lws_malloc(sizeof(*wsi->udp), "udp struct");
if (!wsi->udp)
return 0;
memset(wsi->udp, 0, sizeof(*wsi->udp));
}
#endif
lws_role_transition(wsi, 0, (type & LWS_ADOPT_ALLOW_SSL) ? LRS_SSL_INIT :
LRS_ESTABLISHED, &role_ops_raw_skt);
if (vh_prot_name)
lws_bind_protocol(wsi, wsi->a.protocol, __func__);
else
/* this is the only time he will transition */
lws_bind_protocol(wsi,
&wsi->a.vhost->protocols[wsi->a.vhost->raw_protocol_index],
__func__);
return 1; /* bound */
}
#endif
#if defined(LWS_WITH_CLIENT)
static int
rops_client_bind_raw_skt(struct lws *wsi,
const struct lws_client_connect_info *i)
{
if (!i) {
/* finalize */
if (!wsi->user_space && wsi->stash->cis[CIS_METHOD])
if (lws_ensure_user_space(wsi))
return 1;
return 0;
}
/* we are a fallback if nothing else matched */
if (!i->local_protocol_name ||
strcmp(i->local_protocol_name, "raw-proxy"))
lws_role_transition(wsi, LWSIFR_CLIENT, LRS_UNCONNECTED,
&role_ops_raw_skt);
return 1; /* matched */
}
#endif
static const lws_rops_t rops_table_raw_skt[] = {
/* 1 */ { .handle_POLLIN = rops_handle_POLLIN_raw_skt },
#if defined(LWS_WITH_SERVER)
/* 2 */ { .adoption_bind = rops_adoption_bind_raw_skt },
#else
/* 2 */ { .adoption_bind = NULL },
#endif
#if defined(LWS_WITH_CLIENT)
/* 3 */ { .client_bind = rops_client_bind_raw_skt },
#endif
};
const struct lws_role_ops role_ops_raw_skt = {
/* role name */ "raw-skt",
/* alpn id */ NULL,
/* rops_table */ rops_table_raw_skt,
/* rops_idx */ {
/* LWS_ROPS_check_upgrades */
/* LWS_ROPS_pt_init_destroy */ 0x00,
/* LWS_ROPS_init_vhost */
/* LWS_ROPS_destroy_vhost */ 0x00,
/* LWS_ROPS_service_flag_pending */
/* LWS_ROPS_handle_POLLIN */ 0x01,
/* LWS_ROPS_handle_POLLOUT */
/* LWS_ROPS_perform_user_POLLOUT */ 0x00,
/* LWS_ROPS_callback_on_writable */
/* LWS_ROPS_tx_credit */ 0x00,
/* LWS_ROPS_write_role_protocol */
/* LWS_ROPS_encapsulation_parent */ 0x00,
/* LWS_ROPS_alpn_negotiated */
/* LWS_ROPS_close_via_role_protocol */ 0x00,
/* LWS_ROPS_close_role */
/* LWS_ROPS_close_kill_connection */ 0x00,
/* LWS_ROPS_destroy_role */
#if defined(LWS_WITH_SERVER)
/* LWS_ROPS_adoption_bind */ 0x02,
#else
/* LWS_ROPS_adoption_bind */ 0x00,
#endif
#if defined(LWS_WITH_CLIENT)
/* LWS_ROPS_client_bind */
/* LWS_ROPS_issue_keepalive */ 0x30,
#else
/* LWS_ROPS_client_bind */
/* LWS_ROPS_issue_keepalive */ 0x00,
#endif
},
/* adoption_cb clnt, srv */ { LWS_CALLBACK_RAW_CONNECTED,
LWS_CALLBACK_RAW_ADOPT },
/* rx_cb clnt, srv */ { LWS_CALLBACK_RAW_RX,
LWS_CALLBACK_RAW_RX },
/* writeable cb clnt, srv */ { LWS_CALLBACK_RAW_WRITEABLE,
LWS_CALLBACK_RAW_WRITEABLE},
/* close cb clnt, srv */ { LWS_CALLBACK_RAW_CLOSE,
LWS_CALLBACK_RAW_CLOSE },
/* protocol_bind cb c, srv */ { LWS_CALLBACK_RAW_SKT_BIND_PROTOCOL,
LWS_CALLBACK_RAW_SKT_BIND_PROTOCOL },
/* protocol_unbind cb c, srv */ { LWS_CALLBACK_RAW_SKT_DROP_PROTOCOL,
LWS_CALLBACK_RAW_SKT_DROP_PROTOCOL },
/* file_handle */ 0,
};
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