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i2pd/libi2pd_client/HTTPProxy.cpp

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/*
* Copyright (c) 2013-2024, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
#include <cstring>
#include <cassert>
#include <string>
#include <string_view>
#include <atomic>
#include <memory>
#include <set>
#include <boost/asio.hpp>
#include <boost/algorithm/string/predicate.hpp>
#include <mutex>
#include "I2PService.h"
#include "Destination.h"
#include "HTTPProxy.h"
#include "util.h"
#include "Identity.h"
#include "Streaming.h"
#include "Destination.h"
#include "ClientContext.h"
#include "I2PEndian.h"
#include "I2PTunnel.h"
#include "Config.h"
#include "HTTP.h"
#include "I18N.h"
#include "Socks5.h"
namespace i2p {
namespace proxy {
static const std::vector<std::string> jumporder = {
"reg.i2p",
"stats.i2p",
"identiguy.i2p",
"notbob.i2p"
};
static const std::map<std::string, std::string> jumpservices = {
{ "reg.i2p", "http://shx5vqsw7usdaunyzr2qmes2fq37oumybpudrd4jjj4e4vk4uusa.b32.i2p/jump/" },
{ "identiguy.i2p", "http://3mzmrus2oron5fxptw7hw2puho3bnqmw2hqy7nw64dsrrjwdilva.b32.i2p/cgi-bin/query?hostname=" },
{ "stats.i2p", "http://7tbay5p4kzeekxvyvbf6v7eauazemsnnl2aoyqhg5jzpr5eke7tq.b32.i2p/cgi-bin/jump.cgi?a=" },
{ "notbob.i2p", "http://nytzrhrjjfsutowojvxi7hphesskpqqr65wpistz6wa7cpajhp7a.b32.i2p/cgi-bin/jump.cgi?q=" }
};
static const char *pageHead =
"<head>\r\n"
" <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\r\n"
" <title>I2Pd HTTP proxy</title>\r\n"
" <style type=\"text/css\">\r\n"
" body { font: 100%/1.5em sans-serif; margin: 0; padding: 1.5em; background: #FAFAFA; color: #103456; }\r\n"
" h1 { font-size: 1.7em; color: #894C84; }\r\n"
" @media screen and (max-width: 980px) { h1 { font-size: 1.7em; text-align: center; color: #894C84; }}\r\n"
" </style>\r\n"
"</head>\r\n"
;
static bool str_rmatch(std::string & str, const char *suffix)
{
auto pos = str.rfind (suffix);
if (pos == std::string::npos)
return false; /* not found */
if (str.length() == (pos + std::strlen(suffix)))
return true; /* match */
return false;
}
class HTTPReqHandler: public i2p::client::I2PServiceHandler, public std::enable_shared_from_this<HTTPReqHandler>
{
private:
bool HandleRequest();
void HandleSockRecv(const boost::system::error_code & ecode, std::size_t bytes_transfered);
void Terminate();
void AsyncSockRead();
static bool ExtractAddressHelper(i2p::http::URL& url, std::string& jump, bool& confirm);
static bool VerifyAddressHelper (std::string_view jump);
void SanitizeHTTPRequest(i2p::http::HTTPReq& req);
void SentHTTPFailed(const boost::system::error_code & ecode);
void HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream);
/* error helpers */
void GenericProxyError(const std::string& title, const std::string& description);
void GenericProxyInfo(const std::string& title, const std::string& description);
void HostNotFound(const std::string& host);
void SendProxyError(const std::string& content);
void SendRedirect(const std::string& address);
void ForwardToUpstreamProxy();
void HandleUpstreamHTTPProxyConnect(const boost::system::error_code & ec);
void HandleUpstreamSocksProxyConnect(const boost::system::error_code & ec);
void HTTPConnect(const std::string & host, uint16_t port);
void HandleHTTPConnectStreamRequestComplete(std::shared_ptr<i2p::stream::Stream> stream);
typedef std::function<void(boost::asio::ip::tcp::endpoint)> ProxyResolvedHandler;
void HandleUpstreamProxyResolved(const boost::system::error_code & ecode, boost::asio::ip::tcp::resolver::results_type endpoints, ProxyResolvedHandler handler);
void SocksProxySuccess();
void HandoverToUpstreamProxy();
uint8_t m_recv_chunk[8192];
std::string m_recv_buf; // from client
std::string m_send_buf; // to upstream
std::shared_ptr<boost::asio::ip::tcp::socket> m_sock;
std::shared_ptr<boost::asio::ip::tcp::socket> m_proxysock;
boost::asio::ip::tcp::resolver m_proxy_resolver;
std::string m_OutproxyUrl, m_Response;
bool m_Addresshelper, m_SendUserAgent;
i2p::http::URL m_ProxyURL;
i2p::http::URL m_RequestURL;
int m_req_len;
i2p::http::URL m_ClientRequestURL;
i2p::http::HTTPReq m_ClientRequest;
i2p::http::HTTPRes m_ClientResponse;
std::stringstream m_ClientRequestBuffer;
public:
HTTPReqHandler(HTTPProxy * parent, std::shared_ptr<boost::asio::ip::tcp::socket> sock) :
I2PServiceHandler(parent), m_sock(sock),
m_proxysock(std::make_shared<boost::asio::ip::tcp::socket>(parent->GetService())),
m_proxy_resolver(parent->GetService()),
m_OutproxyUrl(parent->GetOutproxyURL()),
m_Addresshelper(parent->GetHelperSupport()),
m_SendUserAgent (parent->GetSendUserAgent ()) {}
~HTTPReqHandler() { Terminate(); }
void Handle () { AsyncSockRead(); } /* overload */
};
void HTTPReqHandler::AsyncSockRead()
{
LogPrint(eLogDebug, "HTTPProxy: Async sock read");
if (!m_sock) {
LogPrint(eLogError, "HTTPProxy: No socket for read");
return;
}
m_sock->async_read_some(boost::asio::buffer(m_recv_chunk, sizeof(m_recv_chunk)),
std::bind(&HTTPReqHandler::HandleSockRecv, shared_from_this(),
std::placeholders::_1, std::placeholders::_2));
}
void HTTPReqHandler::Terminate() {
if (Kill()) return;
if (m_sock)
{
LogPrint(eLogDebug, "HTTPProxy: Close sock");
m_sock->close();
m_sock = nullptr;
}
if(m_proxysock)
{
LogPrint(eLogDebug, "HTTPProxy: Close proxysock");
if(m_proxysock->is_open())
m_proxysock->close();
m_proxysock = nullptr;
}
Done(shared_from_this());
}
void HTTPReqHandler::GenericProxyError(const std::string& title, const std::string& description) {
std::stringstream ss;
ss << "<h1>" << tr("Proxy error") << ": " << title << "</h1>\r\n";
ss << "<p>" << description << "</p>\r\n";
std::string content = ss.str();
SendProxyError(content);
}
void HTTPReqHandler::GenericProxyInfo(const std::string& title, const std::string& description) {
std::stringstream ss;
ss << "<h1>" << tr("Proxy info") << ": " << title << "</h1>\r\n";
ss << "<p>" << description << "</p>\r\n";
std::string content = ss.str();
SendProxyError(content);
}
void HTTPReqHandler::HostNotFound(const std::string& host)
{
std::stringstream ss;
ss << "<h1>" << tr("Proxy error: Host not found") << "</h1>\r\n"
<< "<p>" << tr("Remote host not found in router's addressbook") << "</p>\r\n"
<< "<p>" << tr("You may try to find this host on jump services below") << ":</p>\r\n"
<< "<ul>\r\n";
for (const auto& jump : jumporder)
{
auto js = jumpservices.find (jump);
if (js != jumpservices.end())
ss << " <li><a href=\"" << js->second << host << "\">" << js->first << "</a></li>\r\n";
}
ss << "</ul>\r\n";
std::string content = ss.str();
SendProxyError(content);
}
void HTTPReqHandler::SendProxyError(const std::string& content)
{
i2p::http::HTTPRes res;
res.code = 500;
res.add_header("Content-Type", "text/html; charset=UTF-8");
res.add_header("Connection", "close");
std::stringstream ss;
ss << "<html>\r\n" << pageHead
<< "<body>" << content << "</body>\r\n"
<< "</html>\r\n";
res.body = ss.str();
m_Response = res.to_string();
boost::asio::async_write(*m_sock, boost::asio::buffer(m_Response), boost::asio::transfer_all(),
std::bind(&HTTPReqHandler::SentHTTPFailed, shared_from_this(), std::placeholders::_1));
}
void HTTPReqHandler::SendRedirect(const std::string& address)
{
i2p::http::HTTPRes res;
res.code = 302;
res.add_header("Location", address);
res.add_header("Connection", "close");
m_Response = res.to_string();
boost::asio::async_write(*m_sock, boost::asio::buffer(m_Response), boost::asio::transfer_all(),
std::bind(&HTTPReqHandler::SentHTTPFailed, shared_from_this(), std::placeholders::_1));
}
bool HTTPReqHandler::ExtractAddressHelper(i2p::http::URL& url, std::string& jump, bool& confirm)
{
confirm = false;
const char *param = "i2paddresshelper=";
std::size_t pos = url.query.find(param);
std::size_t len = std::strlen(param);
std::map<std::string, std::string> params;
if (pos == std::string::npos)
return false; /* not found */
if (!url.parse_query(params))
return false;
std::string value = params["i2paddresshelper"];
len += value.length();
jump = i2p::http::UrlDecode(value);
if (!VerifyAddressHelper (jump))
{
LogPrint (eLogError, "HTTPProxy: Malformed jump link ", jump);
return false;
}
// if we need update exists, request formed with update param
if (params["update"] == "true")
{
len += std::strlen("&update=true");
confirm = true;
}
// if helper is not only one query option and it placed after user's query
if (pos != 0 && url.query[pos-1] == '&')
{
pos--;
len++;
}
// if helper is not only one query option and it placed before user's query
else if (pos == 0 && url.query.length () > len && url.query[len] == '&')
{
// we don't touch the '?' but remove the trailing '&'
len++;
}
else
{
// there is no more query options, resetting hasquery flag
url.hasquery = false;
}
// reset hasquery flag and remove addresshelper from URL
url.query.replace(pos, len, "");
return true;
}
bool HTTPReqHandler::VerifyAddressHelper (std::string_view jump)
{
auto pos = jump.find(".b32.i2p");
if (pos != std::string::npos)
{
auto b32 = jump.substr (0, pos);
for (auto& ch: b32)
if (!i2p::data::IsBase32(ch)) return false;
return true;
}
else
{
bool padding = false;
for (auto& ch: jump)
{
if (ch == '=')
padding = true;
else
{
if (padding) return false; // other chars after padding
if (!i2p::data::IsBase64(ch)) return false;
}
}
return true;
}
return false;
}
void HTTPReqHandler::SanitizeHTTPRequest(i2p::http::HTTPReq& req)
{
/* drop common headers */
req.RemoveHeader("Via");
req.RemoveHeader("From");
req.RemoveHeader("Forwarded");
req.RemoveHeader("DNT"); // Useless DoNotTrack flag
req.RemoveHeader("Accept", "Accept-Encoding"); // Accept*, but Accept-Encoding
/* drop proxy-disclosing headers */
req.RemoveHeader("X-Forwarded");
req.RemoveHeader("Proxy-"); // Proxy-*
/* replace headers */
if (!m_SendUserAgent)
req.UpdateHeader("User-Agent", "MYOB/6.66 (AN/ON)");
/**
* i2pd PR #1816:
* Android Webview send this with the value set to the application ID, so we drop it,
* but only if it does not belong to an AJAX request (*HttpRequest, like XMLHttpRequest).
*/
if(req.GetHeader("X-Requested-With") != "") {
auto h = req.GetHeader ("X-Requested-With");
auto x = h.find("HttpRequest");
if (x == std::string::npos) // not found
req.RemoveHeader("X-Requested-With");
}
/**
* according to i2p ticket #1862:
* leave Referer if requested URL with same schema, host and port,
* otherwise, drop it.
*/
if(req.GetHeader("Referer") != "") {
i2p::http::URL reqURL; reqURL.parse(req.uri);
i2p::http::URL refURL; refURL.parse(req.GetHeader("Referer"));
if(!boost::iequals(reqURL.schema, refURL.schema) || !boost::iequals(reqURL.host, refURL.host) || reqURL.port != refURL.port)
req.RemoveHeader("Referer");
}
/* add headers */
/* close connection, if not Connection: (U|u)pgrade (for websocket) */
auto h = req.GetHeader ("Connection");
auto x = h.find("pgrade");
if (!(x != std::string::npos && std::tolower(h[x - 1]) == 'u'))
req.UpdateHeader("Connection", "close");
}
/**
* @brief Try to parse request from @a m_recv_buf
* If parsing success, rebuild request and store to @a m_send_buf
* with remaining data tail
* @return true on processed request or false if more data needed
*/
bool HTTPReqHandler::HandleRequest()
{
m_req_len = m_ClientRequest.parse(m_recv_buf);
if (m_req_len == 0)
return false; /* need more data */
if (m_req_len < 0) {
LogPrint(eLogError, "HTTPProxy: Unable to parse request");
GenericProxyError(tr("Invalid request"), tr("Proxy unable to parse your request"));
return true; /* parse error */
}
/* parsing success, now let's look inside request */
LogPrint(eLogDebug, "HTTPProxy: Requested: ", m_ClientRequest.uri);
m_RequestURL.parse(m_ClientRequest.uri);
bool m_Confirm;
std::string jump;
if (ExtractAddressHelper(m_RequestURL, jump, m_Confirm))
{
if (!m_Addresshelper || !i2p::client::context.GetAddressBook ().IsEnabled ())
{
LogPrint(eLogWarning, "HTTPProxy: Addresshelper request rejected");
GenericProxyError(tr("Invalid request"), tr("Addresshelper is not supported"));
return true;
}
if (i2p::client::context.GetAddressBook ().RecordExists (m_RequestURL.host, jump))
{
std::string full_url = m_RequestURL.to_string();
SendRedirect(full_url);
return true;
}
else if (!i2p::client::context.GetAddressBook ().FindAddress (m_RequestURL.host) || m_Confirm)
{
const std::string referer_raw = m_ClientRequest.GetHeader("Referer");
i2p::http::URL referer_url;
if (!referer_raw.empty ())
{
referer_url.parse (referer_raw);
}
if (m_RequestURL.host != referer_url.host)
{
if (m_Confirm) // Attempt to forced overwriting by link with "&update=true" from harmful URL
{
LogPrint (eLogWarning, "HTTPProxy: Address update from addresshelper rejected for ", m_RequestURL.host, " (referer is ", m_RequestURL.host.empty() ? "empty" : "harmful", ")");
std::string full_url = m_RequestURL.to_string();
std::stringstream ss;
ss << tr("Host %s is <font color=red>already in router's addressbook</font>. <b>Be careful: source of this URL may be harmful!</b> Click here to update record: <a href=\"%s%s%s&update=true\">Continue</a>.",
m_RequestURL.host.c_str(), full_url.c_str(), (full_url.find('?') != std::string::npos ? "&i2paddresshelper=" : "?i2paddresshelper="), jump.c_str());
GenericProxyInfo(tr("Addresshelper forced update rejected"), ss.str());
}
else // Preventing unauthorized additions to the address book
{
LogPrint (eLogDebug, "HTTPProxy: Adding address from addresshelper for ", m_RequestURL.host, " (generate refer-base page)");
std::string full_url = m_RequestURL.to_string();
std::stringstream ss;
ss << tr("To add host <b>%s</b> in router's addressbook, click here: <a href=\"%s%s%s\">Continue</a>.",
m_RequestURL.host.c_str(), full_url.c_str(), (full_url.find('?') != std::string::npos ? "&i2paddresshelper=" : "?i2paddresshelper="), jump.c_str());
GenericProxyInfo(tr("Addresshelper request"), ss.str());
}
return true; /* request processed */
}
i2p::client::context.GetAddressBook ().InsertAddress (m_RequestURL.host, jump);
LogPrint (eLogInfo, "HTTPProxy: Added address from addresshelper for ", m_RequestURL.host);
std::string full_url = m_RequestURL.to_string();
std::stringstream ss;
ss << tr("Host %s added to router's addressbook from helper. Click here to proceed: <a href=\"%s\">Continue</a>.",
m_RequestURL.host.c_str(), full_url.c_str());
GenericProxyInfo(tr("Addresshelper adding"), ss.str());
return true; /* request processed */
}
else
{
std::string full_url = m_RequestURL.to_string();
std::stringstream ss;
ss << tr("Host %s is <font color=red>already in router's addressbook</font>. Click here to update record: <a href=\"%s%s%s&update=true\">Continue</a>.",
m_RequestURL.host.c_str(), full_url.c_str(), (full_url.find('?') != std::string::npos ? "&i2paddresshelper=" : "?i2paddresshelper="), jump.c_str());
GenericProxyInfo(tr("Addresshelper update"), ss.str());
return true; /* request processed */
}
}
std::string dest_host;
uint16_t dest_port;
bool useConnect = false;
if(m_ClientRequest.method == "CONNECT")
{
const std::string& uri = m_ClientRequest.uri;
auto pos = uri.find(":");
if(pos == std::string::npos || pos == uri.size() - 1)
{
GenericProxyError(tr("Invalid request"), tr("Invalid request URI"));
return true;
}
else
{
useConnect = true;
dest_port = std::stoi(uri.substr(pos+1));
dest_host = uri.substr(0, pos);
}
}
else
{
SanitizeHTTPRequest(m_ClientRequest);
dest_host = m_RequestURL.host;
dest_port = m_RequestURL.port;
/* always set port, even if missing in request */
if (!dest_port)
dest_port = (m_RequestURL.schema == "https") ? 443 : 80;
/* detect dest_host, set proper 'Host' header in upstream request */
if (dest_host != "")
{
/* absolute url, replace 'Host' header */
std::string h = dest_host;
if (dest_port != 0 && dest_port != 80)
h += ":" + std::to_string(dest_port);
m_ClientRequest.UpdateHeader("Host", h);
}
else
{
auto h = m_ClientRequest.GetHeader ("Host");
if (h.length () > 0)
{
/* relative url and 'Host' header provided. transparent proxy mode? */
i2p::http::URL u;
std::string t = "http://" + h;
u.parse(t);
dest_host = u.host;
dest_port = u.port;
}
else
{
/* relative url and missing 'Host' header */
GenericProxyError(tr("Invalid request"), tr("Can't detect destination host from request"));
return true;
}
}
}
/* check dest_host really exists and inside I2P network */
if (str_rmatch(dest_host, ".i2p")) {
if (!i2p::client::context.GetAddressBook ().GetAddress (dest_host)) {
HostNotFound(dest_host);
return true; /* request processed */
}
} else {
if(m_OutproxyUrl.size()) {
LogPrint (eLogDebug, "HTTPProxy: Using outproxy ", m_OutproxyUrl);
if(m_ProxyURL.parse(m_OutproxyUrl))
ForwardToUpstreamProxy();
else
GenericProxyError(tr("Outproxy failure"), tr("Bad outproxy settings"));
} else {
LogPrint (eLogWarning, "HTTPProxy: Outproxy failure for ", dest_host, ": no outproxy enabled");
std::stringstream ss; ss << tr("Host %s is not inside I2P network, but outproxy is not enabled", dest_host.c_str());
GenericProxyError(tr("Outproxy failure"), ss.str());
}
return true;
}
if(useConnect)
{
HTTPConnect(dest_host, dest_port);
return true;
}
/* make relative url */
m_RequestURL.schema = "";
m_RequestURL.host = "";
m_ClientRequest.uri = m_RequestURL.to_string();
/* drop original request from recv buffer */
m_recv_buf.erase(0, m_req_len);
/* build new buffer from modified request and data from original request */
m_send_buf = m_ClientRequest.to_string();
m_send_buf.append(m_recv_buf);
/* connect to destination */
LogPrint(eLogDebug, "HTTPProxy: Connecting to host ", dest_host, ":", dest_port);
GetOwner()->CreateStream (std::bind (&HTTPReqHandler::HandleStreamRequestComplete,
shared_from_this(), std::placeholders::_1), dest_host, dest_port);
return true;
}
void HTTPReqHandler::ForwardToUpstreamProxy()
{
LogPrint(eLogDebug, "HTTPProxy: Forwarded to upstream");
/* build http request */
m_ClientRequestURL = m_RequestURL;
LogPrint(eLogDebug, "HTTPProxy: ", m_ClientRequestURL.host);
m_ClientRequestURL.schema = "";
m_ClientRequestURL.host = "";
std::string origURI = m_ClientRequest.uri; // TODO: what do we need to change uri for?
m_ClientRequest.uri = m_ClientRequestURL.to_string();
/* update User-Agent to ESR version of Firefox, same as Tor Browser below version 13, for non-HTTPS connections */
if(m_ClientRequest.method != "CONNECT" && !m_SendUserAgent)
m_ClientRequest.UpdateHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; rv:109.0) Gecko/20100101 Firefox/115.0");
m_ClientRequest.write(m_ClientRequestBuffer);
m_ClientRequestBuffer << m_recv_buf.substr(m_req_len);
/* assume http if empty schema */
if (m_ProxyURL.schema == "" || m_ProxyURL.schema == "http")
{
/* handle upstream http proxy */
if (!m_ProxyURL.port) m_ProxyURL.port = 80;
if (m_ProxyURL.is_i2p())
{
m_ClientRequest.uri = origURI;
auto auth = i2p::http::CreateBasicAuthorizationString (m_ProxyURL.user, m_ProxyURL.pass);
if (!auth.empty ())
{
/* remove existing authorization if any */
m_ClientRequest.RemoveHeader("Proxy-");
/* add own http proxy authorization */
m_ClientRequest.AddHeader("Proxy-Authorization", auth);
}
m_send_buf = m_ClientRequest.to_string();
m_recv_buf.erase(0, m_req_len);
m_send_buf.append(m_recv_buf);
GetOwner()->CreateStream (std::bind (&HTTPReqHandler::HandleStreamRequestComplete,
shared_from_this(), std::placeholders::_1), m_ProxyURL.host, m_ProxyURL.port);
}
else
{
m_proxy_resolver.async_resolve(m_ProxyURL.host, std::to_string(m_ProxyURL.port), std::bind(&HTTPReqHandler::HandleUpstreamProxyResolved, this,
std::placeholders::_1, std::placeholders::_2, [&](boost::asio::ip::tcp::endpoint ep)
{
m_proxysock->async_connect(ep, std::bind(&HTTPReqHandler::HandleUpstreamHTTPProxyConnect, this, std::placeholders::_1));
}));
}
}
else if (m_ProxyURL.schema == "socks")
{
/* handle upstream socks proxy */
if (!m_ProxyURL.port) m_ProxyURL.port = 9050; // default to tor default if not specified
m_proxy_resolver.async_resolve(m_ProxyURL.host, std::to_string(m_ProxyURL.port), std::bind(&HTTPReqHandler::HandleUpstreamProxyResolved, this,
std::placeholders::_1, std::placeholders::_2, [&](boost::asio::ip::tcp::endpoint ep)
{
m_proxysock->async_connect(ep, std::bind(&HTTPReqHandler::HandleUpstreamSocksProxyConnect, this, std::placeholders::_1));
}));
}
else
{
/* unknown type, complain */
GenericProxyError(tr("Unknown outproxy URL"), m_ProxyURL.to_string());
}
}
void HTTPReqHandler::HandleUpstreamProxyResolved(const boost::system::error_code & ec, boost::asio::ip::tcp::resolver::results_type endpoints, ProxyResolvedHandler handler)
{
if(ec) GenericProxyError(tr("Cannot resolve upstream proxy"), ec.message());
else handler(*endpoints.begin ());
}
void HTTPReqHandler::HandleUpstreamSocksProxyConnect(const boost::system::error_code & ec)
{
if(!ec)
{
if(m_RequestURL.host.size() > 255)
{
GenericProxyError(tr("Hostname is too long"), m_RequestURL.host);
return;
}
uint16_t port = m_RequestURL.port;
if(!port) port = 80;
LogPrint(eLogDebug, "HTTPProxy: Connected to SOCKS upstream");
std::string host = m_RequestURL.host;
auto s = shared_from_this ();
i2p::transport::Socks5Handshake (*m_proxysock, std::make_pair(host, port),
[s](const boost::system::error_code& ec)
{
if (!ec)
s->SocksProxySuccess();
else
s->GenericProxyError(tr("SOCKS proxy error"), ec.message ());
});
}
else
GenericProxyError(tr("Cannot connect to upstream SOCKS proxy"), ec.message());
}
void HTTPReqHandler::HandoverToUpstreamProxy()
{
LogPrint(eLogDebug, "HTTPProxy: Handover to SOCKS proxy");
auto connection = CreateSocketsPipe (GetOwner(), m_proxysock, m_sock);
m_sock = nullptr;
m_proxysock = nullptr;
GetOwner()->AddHandler(connection);
connection->Start();
Terminate();
}
void HTTPReqHandler::HTTPConnect(const std::string & host, uint16_t port)
{
LogPrint(eLogDebug, "HTTPProxy: CONNECT ",host, ":", port);
std::string hostname(host);
if(str_rmatch(hostname, ".i2p"))
GetOwner()->CreateStream (std::bind (&HTTPReqHandler::HandleHTTPConnectStreamRequestComplete,
shared_from_this(), std::placeholders::_1), host, port);
else
ForwardToUpstreamProxy();
}
void HTTPReqHandler::HandleHTTPConnectStreamRequestComplete(std::shared_ptr<i2p::stream::Stream> stream)
{
if(stream)
{
m_ClientResponse.code = 200;
m_ClientResponse.status = "OK";
m_send_buf = m_ClientResponse.to_string();
m_sock->send(boost::asio::buffer(m_send_buf));
auto connection = std::make_shared<i2p::client::I2PTunnelConnection>(GetOwner(), m_sock, stream);
GetOwner()->AddHandler(connection);
connection->I2PConnect();
m_sock = nullptr;
Terminate();
}
else
{
GenericProxyError(tr("CONNECT error"), tr("Failed to connect"));
}
}
void HTTPReqHandler::SocksProxySuccess()
{
if(m_ClientRequest.method == "CONNECT") {
m_ClientResponse.code = 200;
m_send_buf = m_ClientResponse.to_string();
boost::asio::async_write(*m_sock, boost::asio::buffer(m_send_buf), boost::asio::transfer_all(), [&] (const boost::system::error_code & ec, std::size_t transferred)
{
if(ec) GenericProxyError(tr("SOCKS proxy error"), ec.message());
else HandoverToUpstreamProxy();
});
} else {
m_send_buf = m_ClientRequestBuffer.str();
LogPrint(eLogDebug, "HTTPProxy: Send ", m_send_buf.size(), " bytes");
boost::asio::async_write(*m_proxysock, boost::asio::buffer(m_send_buf), boost::asio::transfer_all(), [&](const boost::system::error_code & ec, std::size_t transferred)
{
if(ec) GenericProxyError(tr("Failed to send request to upstream"), ec.message());
else HandoverToUpstreamProxy();
});
}
}
void HTTPReqHandler::HandleUpstreamHTTPProxyConnect(const boost::system::error_code & ec)
{
if(!ec) {
LogPrint(eLogDebug, "HTTPProxy: Connected to http upstream");
GenericProxyError(tr("Cannot connect"), tr("HTTP out proxy not implemented"));
} else GenericProxyError(tr("Cannot connect to upstream HTTP proxy"), ec.message());
}
/* will be called after some data received from client */
void HTTPReqHandler::HandleSockRecv(const boost::system::error_code & ecode, std::size_t len)
{
LogPrint(eLogDebug, "HTTPProxy: Sock recv: ", len, " bytes, recv buf: ", m_recv_buf.length(), ", send buf: ", m_send_buf.length());
if(ecode)
{
LogPrint(eLogWarning, "HTTPProxy: Sock recv got error: ", ecode);
Terminate();
return;
}
m_recv_buf.append(reinterpret_cast<const char *>(m_recv_chunk), len);
if (HandleRequest()) {
m_recv_buf.clear();
return;
}
AsyncSockRead();
}
void HTTPReqHandler::SentHTTPFailed(const boost::system::error_code & ecode)
{
if (ecode)
LogPrint (eLogError, "HTTPProxy: Closing socket after sending failure because: ", ecode.message ());
Terminate();
}
void HTTPReqHandler::HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream)
{
if (!stream) {
LogPrint (eLogError, "HTTPProxy: Error when creating the stream, check the previous warnings for more info");
GenericProxyError(tr("Host is down"), tr("Can't create connection to requested host, it may be down. Please try again later."));
return;
}
if (Kill())
return;
LogPrint (eLogDebug, "HTTPProxy: Created new I2PTunnel stream, sSID=", stream->GetSendStreamID(), ", rSID=", stream->GetRecvStreamID());
auto connection = std::make_shared<i2p::client::I2PClientTunnelConnectionHTTP>(GetOwner(), m_sock, stream);
GetOwner()->AddHandler (connection);
connection->I2PConnect (reinterpret_cast<const uint8_t*>(m_send_buf.data()), m_send_buf.length());
Done (shared_from_this());
}
HTTPProxy::HTTPProxy(const std::string& name, const std::string& address, uint16_t port,
const std::string & outproxy, bool addresshelper, bool senduseragent, std::shared_ptr<i2p::client::ClientDestination> localDestination):
TCPIPAcceptor (address, port, localDestination ? localDestination : i2p::client::context.GetSharedLocalDestination ()),
m_Name (name), m_OutproxyUrl (outproxy), m_Addresshelper (addresshelper), m_SendUserAgent (senduseragent)
{
}
std::shared_ptr<i2p::client::I2PServiceHandler> HTTPProxy::CreateHandler(std::shared_ptr<boost::asio::ip::tcp::socket> socket)
{
return std::make_shared<HTTPReqHandler> (this, socket);
}
} // http
} // i2p