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import { LOG_FETCH } from "../const.js";
import { h } from "../lib.js";
import { dbg_log } from "../log.js";
import {
create_eth_encoder_buf,
handle_fake_networking,
TCPConnection,
TCP_STATE_SYN_RECEIVED,
fake_tcp_connect,
fake_tcp_probe
} from "./fake_network.js";
// For Types Only
import { BusConnector } from "../bus.js";
/**
* @constructor
*
* @param {BusConnector} bus
* @param {*=} config
*/
export function FetchNetworkAdapter(bus, config)
{
config = config || {};
this.bus = bus;
this.id = config.id || 0;
this.router_mac = new Uint8Array((config.router_mac || "52:54:0:1:2:3").split(":").map(function(x) { return parseInt(x, 16); }));
this.router_ip = new Uint8Array((config.router_ip || "192.168.86.1").split(".").map(function(x) { return parseInt(x, 10); }));
this.vm_ip = new Uint8Array((config.vm_ip || "192.168.86.100").split(".").map(function(x) { return parseInt(x, 10); }));
this.masquerade = config.masquerade === undefined || !!config.masquerade;
this.vm_mac = new Uint8Array(6);
this.dns_method = config.dns_method || "static";
this.doh_server = config.doh_server;
this.tcp_conn = {};
this.eth_encoder_buf = create_eth_encoder_buf();
this.fetch = (...args) => fetch(...args);
// Ex: 'https://corsproxy.io/?'
this.cors_proxy = config.cors_proxy;
this.bus.register("net" + this.id + "-mac", function(mac) {
this.vm_mac = new Uint8Array(mac.split(":").map(function(x) { return parseInt(x, 16); }));
}, this);
this.bus.register("net" + this.id + "-send", function(data)
{
this.send(data);
}, this);
}
FetchNetworkAdapter.prototype.destroy = function()
{
};
FetchNetworkAdapter.prototype.on_tcp_connection = function(packet, tuple)
{
if(packet.tcp.dport === 80) {
let conn = new TCPConnection();
conn.state = TCP_STATE_SYN_RECEIVED;
conn.net = this;
conn.on("data", on_data_http);
conn.tuple = tuple;
conn.accept(packet);
this.tcp_conn[tuple] = conn;
return true;
}
return false;
};
FetchNetworkAdapter.prototype.connect = function(port)
{
return fake_tcp_connect(port, this);
};
FetchNetworkAdapter.prototype.tcp_probe = function(port)
{
return fake_tcp_probe(port, this);
};
/**
* @this {TCPConnection}
* @param {!ArrayBuffer} data
*/
async function on_data_http(data)
{
this.read = this.read || "";
this.read += new TextDecoder().decode(data);
if(this.read && this.read.indexOf("\r\n\r\n") !== -1) {
let offset = this.read.indexOf("\r\n\r\n");
let headers = this.read.substring(0, offset).split(/\r\n/);
let data = this.read.substring(offset + 4);
this.read = "";
let first_line = headers[0].split(" ");
let target;
if(/^https?:/.test(first_line[1])) {
// HTTP proxy
target = new URL(first_line[1]);
}
else {
target = new URL("http://host" + first_line[1]);
}
if(typeof window !== "undefined" && target.protocol === "http:" && window.location.protocol === "https:") {
// fix "Mixed Content" errors
target.protocol = "https:";
}
let req_headers = new Headers();
for(let i = 1; i < headers.length; ++i) {
const header = this.net.parse_http_header(headers[i]);
if(!header) {
console.warn('The request contains an invalid header: "%s"', headers[i]);
this.net.respond_text_and_close(this, 400, "Bad Request", `Invalid header in request: ${headers[i]}`);
return;
}
if( header.key.toLowerCase() === "host" ) target.host = header.value;
else req_headers.append(header.key, header.value);
}
if(!this.net.cors_proxy && /^\d+\.external$/.test(target.hostname)) {
dbg_log("Request to localhost: " + target.href, LOG_FETCH);
const localport = parseInt(target.hostname.split(".")[0], 10);
if(!isNaN(localport) && localport > 0 && localport < 65536) {
target.protocol = "http:";
target.hostname = "localhost";
target.port = localport.toString(10);
} else {
console.warn('Unknown port for localhost: "%s"', target.href);
this.net.respond_text_and_close(this, 400, "Bad Request", `Unknown port for localhost: ${target.href}`);
return;
}
}
dbg_log("HTTP Dispatch: " + target.href, LOG_FETCH);
this.name = target.href;
let opts = {
method: first_line[0],
headers: req_headers,
};
if(["put", "post"].indexOf(opts.method.toLowerCase()) !== -1) {
opts.body = data;
}
const fetch_url = this.net.cors_proxy ? this.net.cors_proxy + encodeURIComponent(target.href) : target.href;
const encoder = new TextEncoder();
let response_started = false;
this.net.fetch(fetch_url, opts).then((resp) => {
let resp_headers = new Headers(resp.headers);
resp_headers.delete("content-encoding");
resp_headers.delete("keep-alive");
resp_headers.delete("content-length");
resp_headers.delete("transfer-encoding");
resp_headers.set("x-was-fetch-redirected", `${!!resp.redirected}`);
resp_headers.set("x-fetch-resp-url", resp.url);
resp_headers.set("connection", "close");
this.write(this.net.form_response_head(resp.status, resp.statusText, resp_headers));
response_started = true;
if(resp.body && resp.body.getReader) {
const resp_reader = resp.body.getReader();
const pump = ({ value, done }) => {
if(value) {
this.write(value);
}
if(done) {
this.close();
}
else {
return resp_reader.read().then(pump);
}
};
resp_reader.read().then(pump);
} else {
resp.arrayBuffer().then(buffer => {
this.write(new Uint8Array(buffer));
this.close();
});
}
})
.catch((e) => {
console.warn("Fetch Failed: " + fetch_url + "\n" + e);
if(!response_started) {
this.net.respond_text_and_close(this, 502, "Fetch Error", `Fetch ${fetch_url} failed:\n\n${e.stack || e.message}`);
}
this.close();
});
}
}
FetchNetworkAdapter.prototype.fetch = async function(url, options)
{
if(this.cors_proxy) url = this.cors_proxy + encodeURIComponent(url);
try
{
const resp = await fetch(url, options);
const ab = await resp.arrayBuffer();
return [resp, ab];
}
catch(e)
{
console.warn("Fetch Failed: " + url + "\n" + e);
return [
{
status: 502,
statusText: "Fetch Error",
headers: new Headers({ "Content-Type": "text/plain" }),
},
new TextEncoder().encode(`Fetch ${url} failed:\n\n${e.stack}`).buffer
];
}
};
FetchNetworkAdapter.prototype.form_response_head = function(status_code, status_text, headers)
{
let lines = [
`HTTP/1.1 ${status_code} ${status_text}`
];
for(const [key, value] of headers.entries()) {
lines.push(`${key}: ${value}`);
}
return new TextEncoder().encode(lines.join("\r\n") + "\r\n\r\n");
};
FetchNetworkAdapter.prototype.respond_text_and_close = function(conn, status_code, status_text, body)
{
const headers = new Headers({
"content-type": "text/plain",
"content-length": body.length.toString(10),
"connection": "close"
});
conn.writev([this.form_response_head(status_code, status_text, headers), new TextEncoder().encode(body)]);
conn.close();
};
FetchNetworkAdapter.prototype.parse_http_header = function(header)
{
const parts = header.match(/^([^:]*):(.*)$/);
if(!parts) {
dbg_log("Unable to parse HTTP header", LOG_FETCH);
return;
}
const key = parts[1];
const value = parts[2].trim();
if(key.length === 0)
{
dbg_log("Header key is empty, raw header", LOG_FETCH);
return;
}
if(value.length === 0)
{
dbg_log("Header value is empty", LOG_FETCH);
return;
}
if(!/^[\w-]+$/.test(key))
{
dbg_log("Header key contains forbidden characters", LOG_FETCH);
return;
}
if(!/^[\x20-\x7E]+$/.test(value))
{
dbg_log("Header value contains forbidden characters", LOG_FETCH);
return;
}
return { key, value };
};
/**
* @param {Uint8Array} data
*/
FetchNetworkAdapter.prototype.send = function(data)
{
handle_fake_networking(data, this);
};
/**
* @param {Uint8Array} data
*/
FetchNetworkAdapter.prototype.receive = function(data)
{
this.bus.send("net" + this.id + "-receive", new Uint8Array(data));
};
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