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minimal-ws-raw-proxy

This commit is contained in:
Andy Green 2021-03-04 21:21:25 +00:00
parent fecf496ef9
commit f22f7d91a2
10 changed files with 828 additions and 0 deletions

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project(lws-minimal-ws-raw-proxy C)
cmake_minimum_required(VERSION 2.8.12)
find_package(libwebsockets CONFIG REQUIRED)
list(APPEND CMAKE_MODULE_PATH ${LWS_CMAKE_DIR})
include(CheckCSourceCompiles)
include(LwsCheckRequirements)
set(SAMP lws-minimal-ws-raw-proxy)
set(SRCS minimal-ws-raw-proxy.c)
set(requirements 1)
require_lws_config(LWS_ROLE_WS 1 requirements)
require_lws_config(LWS_WITH_SERVER 1 requirements)
require_lws_config(LWS_WITH_CLIENT 1 requirements)
if (requirements)
add_executable(${SAMP} ${SRCS})
if (websockets_shared)
target_link_libraries(${SAMP} websockets_shared ${LIBWEBSOCKETS_DEP_LIBS})
add_dependencies(${SAMP} websockets_shared)
else()
target_link_libraries(${SAMP} websockets ${LIBWEBSOCKETS_DEP_LIBS})
endif()
endif()

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# lws minimal ws - raw proxy
This demonstrates how to use a proxy connection object to bind together two or
more connections in a proxy. This particular example has a ws server that
creates an onward "raw" client connection to 127.0.0.1:1234.
You can make a suitable "raw server" with
```
$ nc -l 127.0.0.1 1234
```
## build
```
$ cmake . && make
```
## Commandline Options
Option|Meaning
---|---
-d|Set logging verbosity
## usage
```
$ ./lws-minimal-ws-raw-proxy
[2021/03/04 21:14:45:0540] U: LWS minimal ws-raw proxy | visit http://localhost:7681 (-s = use TLS / https)
[2021/03/04 21:14:45:0898] N: LWS: 4.1.99-v4.1.0-294-g2776b4ce65, loglevel 1031
[2021/03/04 21:14:45:0902] N: NET CLI SRV H1 H2 WS SS-JSON-POL SSPROX IPV6-on
[2021/03/04 21:14:45:1146] N: ++ [3224086|wsi|0|pipe] (1)
[2021/03/04 21:14:45:1203] N: ++ [3224086|vh|0|netlink] (1)
[2021/03/04 21:14:45:1284] N: ++ [3224086|vh|1|localhost||7681] (2)
[2021/03/04 21:14:45:1401] N: lws_socket_bind: nowsi: source ads ::
[2021/03/04 21:14:45:1425] N: ++ [3224086|wsi|1|listen|localhost||7681] (2)
[2021/03/04 21:14:46:1164] N: ++ [3224086|wsisrv|0|adopted] (1)
[2021/03/04 21:14:46:2771] N: ++ [3224086|wsisrv|1|adopted] (2)
[2021/03/04 21:14:46:3159] N: ++ [3224086|wsicli|0|RAW/raw-skt/127.0.0.1] (1)
[2021/03/04 21:14:46:3451] N: ++ [3224086|wsisrv|2|adopted] (3)
```
Visit http://localhost:7681 in a browser... it loads JS that opens a ws
connection to the proxy's ws server side. That causes the proxy to open a
raw client connection to 127.0.0.1:1234, and forward anything you type in the
browser to the raw server, and anything typed in the raw server (you must
press enter on netcat to get it sent) is proxied back to the browser.
The proxy can handle many ws connections each with their individual onward
raw client connections, so you could open multiple browser windows. But you
will need a better "raw server" than netcat, which is restricted to just the
one peer at a time.

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-----END CERTIFICATE-----

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@ -0,0 +1,52 @@
-----BEGIN PRIVATE KEY-----
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-----END PRIVATE KEY-----

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/*
* lws-minimal-ws-raw-proxy
*
* Written in 2010-2021 by Andy Green <andy@warmcat.com>
*
* This file is made available under the Creative Commons CC0 1.0
* Universal Public Domain Dedication.
*
* This demonstrates a ws (server) -> raw (client) proxy, it's a ws server
* that accepts connections, creates an onward client connection to some other
* no-protocol server, eg, nc -l 127.0.0.1 1234
*
* The idea is to show the general approach for making async proxies using lws
* that are robust and valgrind-clean.
*
* There's no vhd or pss on either side. Instead when the ws server gets an
* incoming connection and negotiates the ws link, he creates an object
* representing the proxied connection, it is not destroyed automatically when
* any particular wsi is closed, instead the last wsi that is part of the
* proxied connection destroys it when he is closed.
*/
#include <libwebsockets.h>
#include <string.h>
#include <signal.h>
#include <string.h>
/* one of these created for each pending message that is to be forwarded */
typedef struct proxy_msg {
lws_dll2_t list;
size_t len;
/*
* the packet content is overallocated here, if p is a pointer to
* this struct, you can get a pointer to the message contents by
* ((uint8_t)&p[1]) + LWS_PRE.
*
* Notice we additionally take care to overallocate LWS_PRE before the
* actual message data, so we can simplify sending it.
*/
} proxy_msg_t;
/*
* One of these is created when a inbound ws connection joins, it represents
* the proxy action provoked by that.
*/
typedef struct proxy_conn {
struct lws *wsi_ws; /* wsi for the inbound ws conn */
struct lws *wsi_raw; /* wsi for the outbound raw conn */
lws_dll2_owner_t pending_msg_to_ws;
lws_dll2_owner_t pending_msg_to_raw;
} proxy_conn_t;
static int
proxy_ws_raw_msg_destroy(struct lws_dll2 *d, void *user)
{
proxy_msg_t *msg = lws_container_of(d, proxy_msg_t, list);
lws_dll2_remove(d);
free(msg);
return 0;
}
/*
* First the ws server side
*/
static int
callback_proxy_ws_server(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
proxy_conn_t *pc = (proxy_conn_t *)lws_get_opaque_user_data(wsi);
struct lws_client_connect_info i;
proxy_msg_t *msg;
uint8_t *data;
int m, a;
switch (reason) {
case LWS_CALLBACK_ESTABLISHED:
/* so let's create the proxy connection object */
pc = malloc(sizeof(*pc));
memset(pc, 0, sizeof(*pc));
/* mark this accepted ws connection with the proxy conn obj */
lws_set_opaque_user_data(wsi, pc);
/* tell the proxy conn object that we are the ws side of it */
pc->wsi_ws = wsi;
/*
* For this example proxy, our job is to create a new, onward,
* raw client connection to proxy stuff on to
*/
memset(&i, 0, sizeof(i));
i.method = "RAW";
i.context = lws_get_context(wsi);
i.port = 1234;
i.address = "127.0.0.1";
i.ssl_connection = 0;
i.local_protocol_name = "lws-ws-raw-raw";
/* also mark the onward, raw client conn with the proxy_conn */
i.opaque_user_data = pc;
/* if it succeeds, set the wsi into the proxy_conn */
i.pwsi = &pc->wsi_raw;
if (!lws_client_connect_via_info(&i)) {
lwsl_warn("%s: onward connection failed\n", __func__);
return -1; /* hang up on the ws client, triggering
* _CLOSE flow */
}
break;
case LWS_CALLBACK_CLOSED:
/*
* Clean up any pending messages to us that are never going
* to get delivered now, we are in the middle of closing
*/
lws_dll2_foreach_safe(&pc->pending_msg_to_ws, NULL,
proxy_ws_raw_msg_destroy);
/*
* Remove our pointer from the proxy_conn... we are about to
* be destroyed.
*/
pc->wsi_ws = NULL;
lws_set_opaque_user_data(wsi, NULL);
if (!pc->wsi_raw) {
/*
* The onward raw conn either never got started or is
* already closed... then we are the last guy still
* holding on to the proxy_conn... and we're going away
* so let's destroy it
*/
free(pc);
break;
}
/*
* Onward conn still alive...
* does he have stuff left to deliver?
*/
if (pc->pending_msg_to_raw.count) {
/*
* Yes, let him get on with trying to send
* the remaining pieces... but put a time limit
* on how hard he will try now the ws part is
* disappearing... give him 3s
*/
lws_set_timeout(pc->wsi_raw,
PENDING_TIMEOUT_KILLED_BY_PROXY_CLIENT_CLOSE, 3);
break;
}
/*
* Onward raw client conn doesn't have anything left
* to do, let's close him right after this, he will take care to
* destroy the proxy_conn when he goes down after he sees we
* have already been closed
*/
lws_wsi_close(pc->wsi_raw, LWS_TO_KILL_ASYNC);
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
if (!pc || !pc->pending_msg_to_ws.count)
break;
msg = lws_container_of(pc->pending_msg_to_ws.head,
proxy_msg_t, list);
data = (uint8_t *)&msg[1] + LWS_PRE;
/* notice we allowed for LWS_PRE in the payload already */
m = lws_write(wsi, data, msg->len, LWS_WRITE_TEXT);
a = (int)msg->len;
lws_dll2_remove(&msg->list);
free(msg);
if (m < a) {
lwsl_err("ERROR %d writing to ws\n", m);
return -1;
}
/*
* If more to do...
*/
if (pc->pending_msg_to_ws.count)
lws_callback_on_writable(wsi);
break;
case LWS_CALLBACK_RECEIVE:
if (!pc || !pc->wsi_raw)
break;
/* notice we over-allocate by LWS_PRE + rx len */
msg = (proxy_msg_t *)malloc(sizeof(*msg) + LWS_PRE + len);
data = (uint8_t *)&msg[1] + LWS_PRE;
if (!msg) {
lwsl_user("OOM: dropping\n");
break;
}
memset(msg, 0, sizeof(*msg));
msg->len = len;
memcpy(data, in, len);
/* add us on to the list of packets to send to the onward conn */
lws_dll2_add_tail(&msg->list, &pc->pending_msg_to_raw);
/* ask to send on the onward proxy client conn */
lws_callback_on_writable(pc->wsi_raw);
break;
default:
break;
}
return 0;
}
/*
* Then the onward, raw client side
*/
static int
callback_proxy_raw_client(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
proxy_conn_t *pc = (proxy_conn_t *)lws_get_opaque_user_data(wsi);
proxy_msg_t *msg;
uint8_t *data;
int m, a;
switch (reason) {
case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
lwsl_warn("%s: onward raw connection failed\n", __func__);
pc->wsi_raw = NULL;
break;
case LWS_CALLBACK_RAW_ADOPT:
lwsl_user("LWS_CALLBACK_RAW_ADOPT\n");
pc->wsi_raw = wsi;
lws_callback_on_writable(wsi);
break;
case LWS_CALLBACK_RAW_CLOSE:
lwsl_user("LWS_CALLBACK_RAW_CLOSE\n");
/*
* Clean up any pending messages to us that are never going
* to get delivered now, we are in the middle of closing
*/
lws_dll2_foreach_safe(&pc->pending_msg_to_raw, NULL,
proxy_ws_raw_msg_destroy);
/*
* Remove our pointer from the proxy_conn... we are about to
* be destroyed.
*/
pc->wsi_raw = NULL;
lws_set_opaque_user_data(wsi, NULL);
if (!pc->wsi_ws) {
/*
* The original ws conn is already closed... then we are
* the last guy still holding on to the proxy_conn...
* and we're going away, so let's destroy it
*/
free(pc);
break;
}
/*
* Original ws conn still alive...
* does he have stuff left to deliver?
*/
if (pc->pending_msg_to_ws.count) {
/*
* Yes, let him get on with trying to send
* the remaining pieces... but put a time limit
* on how hard he will try now the raw part is
* disappearing... give him 3s
*/
lws_set_timeout(pc->wsi_ws,
PENDING_TIMEOUT_KILLED_BY_PROXY_CLIENT_CLOSE, 3);
break;
}
/*
* Original ws client conn doesn't have anything left
* to do, let's close him right after this, he will take care to
* destroy the proxy_conn when he goes down after he sees we
* have already been closed
*/
lws_wsi_close(pc->wsi_ws, LWS_TO_KILL_ASYNC);
break;
case LWS_CALLBACK_RAW_RX:
lwsl_user("LWS_CALLBACK_RAW_RX (%d)\n", (int)len);
if (!pc || !pc->wsi_ws)
break;
/* notice we over-allocate by LWS_PRE + rx len */
msg = (proxy_msg_t *)malloc(sizeof(*msg) + LWS_PRE + len);
data = (uint8_t *)&msg[1] + LWS_PRE;
if (!msg) {
lwsl_user("OOM: dropping\n");
break;
}
memset(msg, 0, sizeof(*msg));
msg->len = len;
memcpy(data, in, len);
/* add us on to the list of packets to send to the onward conn */
lws_dll2_add_tail(&msg->list, &pc->pending_msg_to_ws);
/* ask to send on the onward proxy client conn */
lws_callback_on_writable(pc->wsi_ws);
break;
case LWS_CALLBACK_RAW_WRITEABLE:
lwsl_user("LWS_CALLBACK_RAW_WRITEABLE\n");
if (!pc || !pc->pending_msg_to_raw.count)
break;
msg = lws_container_of(pc->pending_msg_to_raw.head,
proxy_msg_t, list);
data = (uint8_t *)&msg[1] + LWS_PRE;
/* notice we allowed for LWS_PRE in the payload already */
m = lws_write(wsi, data, msg->len, LWS_WRITE_TEXT);
a = (int)msg->len;
lws_dll2_remove(&msg->list);
free(msg);
if (m < a) {
lwsl_err("ERROR %d writing to raw\n", m);
return -1;
}
/*
* If more to do...
*/
if (pc->pending_msg_to_raw.count)
lws_callback_on_writable(wsi);
break;
default:
break;
}
return 0;
}
static struct lws_protocols protocols[] = {
{ "http", lws_callback_http_dummy, 0, 0 },
{ "lws-ws-raw-ws", callback_proxy_ws_server, 0, 1024 },
{ "lws-ws-raw-raw", callback_proxy_raw_client, 0, 1024 },
{ NULL, NULL, 0, 0 } /* terminator */
};
static const lws_retry_bo_t retry = {
.secs_since_valid_ping = 3,
.secs_since_valid_hangup = 10,
};
static int interrupted;
static const struct lws_http_mount mount = {
/* .mount_next */ NULL, /* linked-list "next" */
/* .mountpoint */ "/", /* mountpoint URL */
/* .origin */ "./mount-origin", /* serve from dir */
/* .def */ "index.html", /* default filename */
/* .protocol */ NULL,
/* .cgienv */ NULL,
/* .extra_mimetypes */ NULL,
/* .interpret */ NULL,
/* .cgi_timeout */ 0,
/* .cache_max_age */ 0,
/* .auth_mask */ 0,
/* .cache_reusable */ 0,
/* .cache_revalidate */ 0,
/* .cache_intermediaries */ 0,
/* .origin_protocol */ LWSMPRO_FILE, /* files in a dir */
/* .mountpoint_len */ 1, /* char count */
/* .basic_auth_login_file */ NULL,
};
void sigint_handler(int sig)
{
interrupted = 1;
}
int main(int argc, const char **argv)
{
struct lws_context_creation_info info;
struct lws_context *context;
const char *p;
int n = 0, logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE
/* for LLL_ verbosity above NOTICE to be built into lws,
* lws must have been configured and built with
* -DCMAKE_BUILD_TYPE=DEBUG instead of =RELEASE */
/* | LLL_INFO */ /* | LLL_PARSER */ /* | LLL_HEADER */
/* | LLL_EXT */ /* | LLL_CLIENT */ /* | LLL_LATENCY */
/* | LLL_DEBUG */;
signal(SIGINT, sigint_handler);
if ((p = lws_cmdline_option(argc, argv, "-d")))
logs = atoi(p);
lws_set_log_level(logs, NULL);
lwsl_user("LWS minimal ws-raw proxy | visit http://localhost:7681 (-s = use TLS / https)\n");
memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
info.port = 7681;
info.mounts = &mount;
info.protocols = protocols;
info.vhost_name = "localhost";
info.options =
LWS_SERVER_OPTION_HTTP_HEADERS_SECURITY_BEST_PRACTICES_ENFORCE;
#if defined(LWS_WITH_TLS)
if (lws_cmdline_option(argc, argv, "-s")) {
lwsl_user("Server using TLS\n");
info.options |= LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
info.ssl_cert_filepath = "localhost-100y.cert";
info.ssl_private_key_filepath = "localhost-100y.key";
}
#endif
if (lws_cmdline_option(argc, argv, "-h"))
info.options |= LWS_SERVER_OPTION_VHOST_UPG_STRICT_HOST_CHECK;
if (lws_cmdline_option(argc, argv, "-v"))
info.retry_and_idle_policy = &retry;
context = lws_create_context(&info);
if (!context) {
lwsl_err("lws init failed\n");
return 1;
}
while (n >= 0 && !interrupted)
n = lws_service(context, 0);
lws_context_destroy(context);
return 0;
}

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function get_appropriate_ws_url(extra_url)
{
var pcol;
var u = document.URL;
/*
* We open the websocket encrypted if this page came on an
* https:// url itself, otherwise unencrypted
*/
if (u.substring(0, 5) === "https") {
pcol = "wss://";
u = u.substr(8);
} else {
pcol = "ws://";
if (u.substring(0, 4) === "http")
u = u.substr(7);
}
u = u.split("/");
/* + "/xxx" bit is for IE10 workaround */
return pcol + u[0] + "/" + extra_url;
}
function new_ws(urlpath, protocol)
{
return new WebSocket(urlpath, protocol);
}
document.addEventListener("DOMContentLoaded", function() {
var ws = new_ws(get_appropriate_ws_url(""), "lws-ws-raw-ws");
try {
ws.onopen = function() {
document.getElementById("m").disabled = 0;
document.getElementById("b").disabled = 0;
};
ws.onmessage =function got_packet(msg) {
document.getElementById("r").value =
document.getElementById("r").value + msg.data + "\n";
document.getElementById("r").scrollTop =
document.getElementById("r").scrollHeight;
};
ws.onclose = function(){
document.getElementById("m").disabled = 1;
document.getElementById("b").disabled = 1;
};
} catch(exception) {
alert("<p>Error " + exception);
}
function sendmsg()
{
ws.send(document.getElementById("m").value);
document.getElementById("m").value = "";
}
document.getElementById("b").addEventListener("click", sendmsg);
}, false);

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<html>
<head>
<meta charset=utf-8 http-equiv="Content-Language" content="en"/>
<script src="/example.js"></script>
</head>
<body>
<img src="libwebsockets.org-logo.svg">
<img src="strict-csp.svg"><br>
LWS chat <b>minimal ws server example</b>.<br>
Chat is sent to all browsers open on this page.
<br>
<br>
<textarea id=r readonly cols=40 rows=10></textarea><br>
<input type="text" id=m cols=40 rows=1>
<button id=b>Send</button>
</body>
</html>

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