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/* Simple WebSocket relay facilitating client-to-client connections.
*
* Author: Steffen Vogel <post@steffenvogel.de>
* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
* SPDX-License-Identifier: Apache-2.0
*/
#include <cstring>
#include <iostream>
#include <queue>
#include <string>
#include <unordered_map>
#include <utility>
#include <jansson.h>
#include <unistd.h>
#include <villas/compat.hpp>
#include <villas/log.hpp>
#include <villas/node/config.hpp>
#include <villas/node/memory.hpp>
#include <villas/tool.hpp>
#include <villas/uuid.hpp>
#include <villas/web.hpp>
#include "villas-relay.hpp"
using namespace villas;
using namespace villas::node;
namespace villas {
namespace node {
namespace tools {
RelaySession::RelaySession(Relay *r, Identifier sid)
: identifier(sid), connects(0) {
auto loggerName = fmt::format("relay:{}", sid);
logger = villas::Log::get(loggerName);
logger->info("Session created: {}", identifier);
sessions[sid] = this;
created = time(nullptr);
uuid::generateFromString(uuid, identifier, r->uuid);
}
RelaySession::~RelaySession() {
logger->info("Session destroyed: {}", identifier);
sessions.erase(identifier);
}
RelaySession *RelaySession::get(Relay *r, lws *wsi) {
char uri[64];
/* We use the URI to associate this connection to a session
* Example: ws://example.com/node_1
* Will select the session with the name 'node_1'
*/
// Get path of incoming request
lws_hdr_copy(wsi, uri, sizeof(uri), WSI_TOKEN_GET_URI);
if (strlen(uri) <= 1)
throw InvalidUrlException();
Identifier sid = uri + 1;
auto it = sessions.find(sid);
if (it == sessions.end()) {
auto *rs = new RelaySession(r, sid);
if (!rs)
throw MemoryAllocationError();
return rs;
} else {
auto logger = Log::get("villas-relay");
logger->info("Found existing session: {}", sid);
return it->second;
}
}
json_t *RelaySession::toJson() const {
json_t *json_connections = json_array();
for (auto it : connections) {
auto conn = it.second;
json_array_append(json_connections, conn->toJson());
}
return json_pack("{ s: s, s: s, s: o, s: I, s: i }", "identifier",
identifier.c_str(), "uuid", uuid::toString(uuid).c_str(),
"connections", json_connections, "created", created,
"connects", connects);
}
std::unordered_map<std::string, RelaySession *> RelaySession::sessions;
RelayConnection::RelayConnection(Relay *r, lws *w, bool lo)
: wsi(w), currentFrame(std::make_shared<Frame>()), outgoingFrames(),
bytes_recv(0), bytes_sent(0), frames_recv(0), frames_sent(0),
loopback(lo) {
session = RelaySession::get(r, wsi);
session->connections[wsi] = this;
session->connects++;
lws_get_peer_addresses(wsi, lws_get_socket_fd(wsi), name, sizeof(name), ip,
sizeof(ip));
created = time(nullptr);
session->logger->info("New connection established: {} ({})", name, ip);
}
RelayConnection::~RelayConnection() {
session->logger->info("Connection closed: {} ({})", name, ip);
session->connections.erase(wsi);
if (session->connections.empty())
delete session;
}
json_t *RelayConnection::toJson() const {
return json_pack("{ s: s, s: s, s: I, s: I, s: I, s: I, s: I }", "name", name,
"ip", ip, "created", created, "bytes_recv", bytes_recv,
"bytes_sent", bytes_sent, "frames_recv", frames_recv,
"frames_sent", frames_sent);
}
void RelayConnection::write() {
if (outgoingFrames.empty())
return;
auto fr = outgoingFrames.front();
int ret = lws_write(wsi, fr->data(), fr->size(), LWS_WRITE_BINARY);
if (ret < 0)
return;
bytes_sent += fr->size();
frames_sent++;
outgoingFrames.pop();
if (outgoingFrames.size() > 0)
lws_callback_on_writable(wsi);
}
void RelayConnection::read(void *in, size_t len) {
currentFrame->insert(currentFrame->end(), (uint8_t *)in, (uint8_t *)in + len);
bytes_recv += len;
if (lws_is_final_fragment(wsi)) {
frames_recv++;
session->logger->debug("Received frame, relaying to {} connections",
session->connections.size() - (loopback ? 0 : 1));
for (auto p : session->connections) {
auto c = p.second;
/* We skip the current connection in order
* to avoid receiving our own data */
if (loopback == false && c == this)
continue;
c->outgoingFrames.push(currentFrame);
lws_callback_on_writable(c->wsi);
}
currentFrame = std::make_shared<Frame>();
}
}
Relay::Relay(int argc, char *argv[])
: Tool(argc, argv, "relay"), stop(false), context(nullptr), vhost(nullptr),
loopback(false), port(8088), protocol("live") {
int ret;
char hname[128];
ret = gethostname(hname, sizeof(hname));
if (ret)
throw SystemError("Failed to get hostname");
hostname = hname;
// Default UUID is derived from hostname
uuid::generateFromString(uuid, hname);
ret = memory::init(0);
if (ret)
throw RuntimeError("Failed to initialize memory");
// Initialize logging
lws_set_log_level(Web::lwsLogLevel(Log::getInstance().getLevel()),
Web::lwsLogger);
protocols = {{.name = "http",
.callback = lws_callback_http_dummy,
.per_session_data_size = 0,
.rx_buffer_size = 1024},
{.name = "http-api",
.callback = httpProtocolCallback,
.per_session_data_size = 0,
.rx_buffer_size = 1024},
{.name = "live",
.callback = protocolCallback,
.per_session_data_size = sizeof(RelayConnection),
.rx_buffer_size = 0},
{nullptr /* terminator */}};
}
int Relay::httpProtocolCallback(lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len) {
int ret;
lws_context *ctx = lws_get_context(wsi);
void *user_ctx = lws_context_user(ctx);
Relay *r = reinterpret_cast<Relay *>(user_ctx);
switch (reason) {
case LWS_CALLBACK_HTTP: {
unsigned char buf[LWS_PRE + 2048], *start = &buf[LWS_PRE],
*end = &buf[sizeof(buf) - LWS_PRE - 1],
*p = start;
if (lws_add_http_common_headers(
wsi, HTTP_STATUS_OK, "application/json",
LWS_ILLEGAL_HTTP_CONTENT_LEN, // no content len
&p, end))
return 1;
if (lws_finalize_write_http_header(wsi, start, &p, end))
return 1;
// Write the body separately
lws_callback_on_writable(wsi);
return 0;
}
case LWS_CALLBACK_HTTP_WRITEABLE: {
size_t len;
std::vector<char> buf;
json_t *json_sessions, *json_body;
json_sessions = json_array();
for (auto it : RelaySession::sessions) {
auto &session = it.second;
json_array_append(json_sessions, session->toJson());
}
json_body = json_pack("{ s: o, s: s, s: s, s: s, s: { s: b, s: i, s: s } }",
"sessions", json_sessions, //
"version", PROJECT_VERSION, //
"hostname", r->hostname.c_str(), //
"uuid", uuid::toString(r->uuid).c_str(), //
"options", "loopback", r->loopback, //
"port", r->port, //
"protocol", r->protocol.c_str());
if (!json_body)
return -1;
len = 1024;
do {
buf.resize(LWS_PRE + len);
len = json_dumpb(json_body, buf.data() + LWS_PRE, buf.size() - LWS_PRE,
JSON_INDENT(4));
if (len == 0)
return -1;
} while (len > buf.size() - LWS_PRE);
ret = lws_write(wsi, (unsigned char *)(buf.data() + LWS_PRE), len,
LWS_WRITE_HTTP_FINAL);
if (ret < 0)
return ret;
r->logger->info("Handled API request");
return -1;
}
default:
break;
}
return lws_callback_http_dummy(wsi, reason, user, in, len);
}
int Relay::protocolCallback(lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len) {
lws_context *ctx = lws_get_context(wsi);
void *user_ctx = lws_context_user(ctx);
Relay *r = reinterpret_cast<Relay *>(user_ctx);
RelayConnection *c = reinterpret_cast<RelayConnection *>(user);
switch (reason) {
case LWS_CALLBACK_ESTABLISHED:
try {
new (c) RelayConnection(r, wsi, r->loopback);
} catch (const InvalidUrlException &e) {
lws_close_reason(wsi, LWS_CLOSE_STATUS_PROTOCOL_ERR,
(unsigned char *)"Invalid URL", strlen("Invalid URL"));
return -1;
}
break;
case LWS_CALLBACK_CLOSED:
c->~RelayConnection();
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
c->write();
break;
case LWS_CALLBACK_RECEIVE:
c->read(in, len);
break;
default:
break;
}
return 0;
}
void Relay::usage() {
std::cout << "Usage: villas-relay [OPTIONS]" << std::endl
<< " OPTIONS is one or more of the following options:" << std::endl
<< " -d LVL set debug level" << std::endl
<< " -p PORT the port number to listen on" << std::endl
<< " -P PROT the websocket protocol" << std::endl
<< " -l enable loopback of own data" << std::endl
<< " -u UUID unique instance id" << std::endl
<< " -V show version and exit" << std::endl
<< " -h show usage and exit" << std::endl
<< std::endl;
printCopyright();
}
void Relay::parse() {
int ret;
char c, *endptr;
while ((c = getopt(argc, argv, "hVp:P:ld:u:")) != -1) {
switch (c) {
case 'd':
Log::getInstance().setLevel(optarg);
lws_set_log_level(Web::lwsLogLevel(Log::getInstance().getLevel()),
Web::lwsLogger);
break;
case 'p':
port = strtoul(optarg, &endptr, 10);
goto check;
case 'P':
protocol = optarg;
break;
case 'l':
loopback = true;
break;
case 'u':
ret = uuid_parse(optarg, uuid);
if (ret) {
logger->error("Failed to parse UUID: {}", optarg);
exit(EXIT_FAILURE);
}
break;
case 'V':
printVersion();
exit(EXIT_SUCCESS);
case 'h':
case '?':
usage();
exit(c == '?' ? EXIT_FAILURE : EXIT_SUCCESS);
}
continue;
check:
if (optarg == endptr) {
logger->error("Failed to parse parse option argument '-{} {}'", c,
optarg);
exit(EXIT_FAILURE);
}
}
if (argc - optind < 0) {
usage();
exit(EXIT_FAILURE);
}
}
int Relay::main() {
// Start server
lws_context_creation_info ctx_info = {0};
protocols[2].name = protocol.c_str();
ctx_info.options =
LWS_SERVER_OPTION_EXPLICIT_VHOSTS | LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
ctx_info.gid = -1;
ctx_info.uid = -1;
ctx_info.protocols = protocols.data();
#ifndef LWS_WITHOUT_EXTENSIONS
ctx_info.extensions = extensions.data();
#endif
ctx_info.port = port;
ctx_info.mounts = &mount;
ctx_info.user = (void *)this;
auto lwsLogger = Log::get("lws");
context = lws_create_context(&ctx_info);
if (context == nullptr) {
lwsLogger->error("Failed to initialize server context");
exit(EXIT_FAILURE);
}
vhost = lws_create_vhost(context, &ctx_info);
if (vhost == nullptr) {
lwsLogger->error("Failed to initialize virtual host");
exit(EXIT_FAILURE);
}
while (!stop)
lws_service(context, 100);
return 0;
}
const std::vector<lws_extension> Relay::extensions = {
#ifdef LWS_DEFLATE_FOUND
{"permessage-deflate", lws_extension_callback_pm_deflate,
"permessage-deflate"},
{"deflate-frame", lws_extension_callback_pm_deflate, "deflate_frame"},
#endif // LWS_DEFLATE_FOUND
{nullptr /* terminator */}};
const lws_http_mount Relay::mount = {
.mount_next = nullptr, // linked-list "next"
.mountpoint = "/api/v1", // mountpoint URL
.origin = nullptr, // protocol
.def = nullptr,
.protocol = "http-api",
.cgienv = nullptr,
.extra_mimetypes = nullptr,
.interpret = nullptr,
.cgi_timeout = 0,
.cache_max_age = 0,
.auth_mask = 0,
.cache_reusable = 0,
.cache_revalidate = 0,
.cache_intermediaries = 0,
.origin_protocol = LWSMPRO_CALLBACK, // dynamic
.mountpoint_len = 7, // char count
.basic_auth_login_file = nullptr,
};
} // namespace tools
} // namespace node
} // namespace villas
int main(int argc, char *argv[]) {
villas::node::tools::Relay t(argc, argv);
return t.run();
}
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