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opendht/src/http.cpp
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/*
* Copyright (C) 2014-2020 Savoir-faire Linux Inc.
* Author: Vsevolod Ivanov <vsevolod.ivanov@savoirfairelinux.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "http.h"
#include "log_enable.h"
#include "crypto.h"
#include "base64.h"
#include "compat/os_cert.h"
#include <asio.hpp>
#include <restinio/impl/tls_socket.hpp>
#include <http_parser.h>
#include <json/json.h>
#include <openssl/ocsp.h>
#include <openssl/ssl.h>
#include <openssl/asn1.h>
#include <openssl/x509.h>
#define MAXAGE_SEC (14*24*60*60)
#define JITTER_SEC (60)
#define OCSP_MAX_RESPONSE_SIZE (20480)
namespace dht {
namespace http {
constexpr const char HTTP_HEADER_CONTENT_TYPE_JSON[] = "application/json";
constexpr const char HTTP_HEADER_DELIM[] = "\r\n\r\n";
constexpr const char HTTP_PROTOCOL[] = "http://";
constexpr const char HTTPS_PROTOCOL[] = "https://";
constexpr const char ORIGIN_PROTOCOL[] = "//";
constexpr unsigned MAX_REDIRECTS {5};
Url::Url(const std::string& url): url(url)
{
size_t addr_begin = 0;
// protocol
const size_t proto_end = url.find("://");
if (proto_end != std::string::npos){
addr_begin = proto_end + 3;
if (url.substr(0, proto_end) == "https"){
protocol = "https";
}
}
// host and service
size_t addr_size = url.substr(addr_begin).find("/");
if (addr_size == std::string::npos)
addr_size = url.size() - addr_begin;
auto host_service = splitPort(url.substr(addr_begin, addr_size));
host = host_service.first;
if (!host_service.second.empty())
service = host_service.second;
// target, query and fragment
size_t query_begin = url.find("?");
auto addr_end = addr_begin + addr_size;
if (addr_end < url.size())
target = url.substr(addr_end);
size_t fragment_begin = url.find("#");
if (fragment_begin == std::string::npos){
query = url.substr(query_begin + 1);
} else {
target = url.substr(addr_end, fragment_begin - addr_end);
query = url.substr(query_begin + 1, fragment_begin - query_begin - 1);
fragment = url.substr(fragment_begin);
}
}
std::string
Url::toString() const
{
std::stringstream ss;
if (not protocol.empty()) {
ss << protocol << "://";
}
ss << host;
if (not service.empty()) {
ss << ':' << service;
}
ss << target;
return ss.str();
}
// connection
std::atomic_uint Connection::ids_ {1};
std::shared_ptr<asio::ssl::context>
newTlsClientContext(const std::shared_ptr<dht::Logger>& logger)
{
auto ctx = std::make_shared<asio::ssl::context>(asio::ssl::context::tls_client);
ctx->set_verify_mode(asio::ssl::verify_peer | asio::ssl::verify_fail_if_no_peer_cert);
if (char* path = getenv("CA_ROOT_FILE")) {
if (logger)
logger->d("[connection:%i] using CA file: %s", path);
ctx->load_verify_file(path);
} else if (char* path = getenv("CA_ROOT_PATH")) {
if (logger)
logger->d("[connection:%i] using CA path: %s", path);
ctx->add_verify_path(path);
} else {
#ifdef __ANDROID__
if (logger)
logger->d("[connection:%i] using CA path: /system/etc/security/cacerts");
ctx->add_verify_path("/system/etc/security/cacerts");
#elif defined(WIN32) || defined(__APPLE__)
PEMCache::instance(logger).fillX509Store(ctx->native_handle());
#else
if (logger)
logger->d("[connection:%i] using default CA path");
ctx->set_default_verify_paths();
#endif
}
return ctx;
}
Connection::Connection(asio::io_context& ctx, const bool ssl, std::shared_ptr<dht::Logger> l)
: id_(Connection::ids_++), ctx_(ctx), istream_(&read_buf_), logger_(l)
{
if (ssl) {
ssl_ctx_ = newTlsClientContext(l);
ssl_socket_ = std::make_unique<ssl_socket_t>(ctx_, ssl_ctx_);
if (logger_)
logger_->d("[connection:%i] start https session", id_);
}
else {
socket_ = std::make_unique<socket_t>(ctx);
if (logger_)
logger_->d("[connection:%i] start http session", id_);
}
}
Connection::Connection(asio::io_context& ctx, std::shared_ptr<dht::crypto::Certificate> server_ca,
const dht::crypto::Identity& identity, std::shared_ptr<dht::Logger> l)
: id_(Connection::ids_++), ctx_(ctx), istream_(&read_buf_), logger_(l)
{
asio::error_code ec;
if (server_ca) {
ssl_ctx_ = std::make_shared<asio::ssl::context>(asio::ssl::context::tls_client);
ssl_ctx_->set_verify_mode(asio::ssl::verify_peer | asio::ssl::verify_fail_if_no_peer_cert);
auto ca = server_ca->toString(false/*chain*/);
ssl_ctx_->add_certificate_authority(asio::const_buffer{ca.data(), ca.size()}, ec);
if (ec)
throw std::runtime_error("Error adding certificate authority: " + ec.message());
else if (logger_)
logger_->d("[connection:%i] certficate authority %s", id_, server_ca->getUID().c_str());
} else {
ssl_ctx_ = newTlsClientContext(l);
}
if (identity.first){
auto key = identity.first->serialize();
ssl_ctx_->use_private_key(asio::const_buffer{key.data(), key.size()},
asio::ssl::context::file_format::pem, ec);
if (ec)
throw std::runtime_error("Error setting client private key: " + ec.message());
}
if (identity.second){
auto cert = identity.second->toString(true/*chain*/);
ssl_ctx_->use_certificate_chain(asio::const_buffer{cert.data(), cert.size()}, ec);
if (ec)
throw std::runtime_error("Error adding client certificate: " + ec.message());
else if (logger_)
logger_->d("[connection:%i] client certificate %s", id_, identity.second->getUID().c_str());
}
ssl_socket_ = std::make_unique<ssl_socket_t>(ctx_, ssl_ctx_);
}
Connection::~Connection() {
close();
}
void
Connection::close()
{
std::lock_guard<std::mutex> lock(mutex_);
asio::error_code ec;
if (ssl_socket_) {
if (ssl_socket_->is_open())
ssl_socket_->close(ec);
}
else if (socket_) {
if (socket_->is_open())
socket_->close(ec);
}
if (ec and logger_)
logger_->e("[connection:%i] error closing: %s", id_, ec.message().c_str());
}
bool
Connection::is_open() const
{
if (ssl_socket_) return ssl_socket_->is_open();
else if (socket_) return socket_->is_open();
else return false;
}
bool
Connection::is_ssl() const
{
return ssl_ctx_ ? true : false;
}
static time_t
parse_ocsp_time(ASN1_GENERALIZEDTIME* gt)
{
struct tm tm;
time_t rv = -1;
if (gt == nullptr)
return -1;
// RFC 6960 specifies that all times in OCSP must be GENERALIZEDTIME
if (ASN1_time_parse((const char*)gt->data, gt->length, &tm, V_ASN1_GENERALIZEDTIME) == -1)
return -1;
if ((rv = timegm(&tm)) == -1)
return -1;
return rv;
}
static inline X509*
cert_from_chain(STACK_OF(X509)* fullchain)
{
return sk_X509_value(fullchain, 0);
}
static X509*
issuer_from_chain(STACK_OF(X509)* fullchain)
{
X509 *cert, *issuer;
X509_NAME *issuer_name;
cert = cert_from_chain(fullchain);
if ((issuer_name = X509_get_issuer_name(cert)) == nullptr)
return nullptr;
issuer = X509_find_by_subject(fullchain, issuer_name);
return issuer;
}
using OscpRequestPtr = std::unique_ptr<OCSP_REQUEST, decltype(&OCSP_REQUEST_free)>;
struct OscpRequestInfo {
OscpRequestPtr req {nullptr, &OCSP_REQUEST_free};
std::vector<uint8_t> data;
std::string url;
};
static std::unique_ptr<OscpRequestInfo>
ocspRequestFromCert(STACK_OF(X509)* fullchain, const std::shared_ptr<Logger>& logger, bool nonce = false)
{
if (fullchain == nullptr)
return {};
if (sk_X509_num(fullchain) <= 1) {
if (logger)
logger->e("Cert does not contain a cert chain");
return {};
}
X509* cert = cert_from_chain(fullchain);
if (cert == nullptr) {
if (logger)
logger->e("No certificate found");
return {};
}
X509* issuer = issuer_from_chain(fullchain);
if (issuer == nullptr) {
if (logger)
logger->e("Unable to find issuer for cert");
return {};
}
auto urls = X509_get1_ocsp(cert);
if (urls == nullptr || sk_OPENSSL_STRING_num(urls) <= 0) {
if (logger)
logger->e("Certificate contains no OCSP url");
return {};
}
auto url = sk_OPENSSL_STRING_value(urls, 0);
if (url == nullptr)
return {};
auto request = std::make_unique<OscpRequestInfo>();
request->req = OscpRequestPtr(OCSP_REQUEST_new(), &OCSP_REQUEST_free);
request->url = strdup(url);
X509_email_free(urls);
OCSP_CERTID* id = OCSP_cert_to_id(EVP_sha1(), cert, issuer);
if (id == nullptr) {
if (logger)
logger->e("Unable to get certificate id from cert");
return {};
}
if (OCSP_request_add0_id(request->req.get(), id) == nullptr) {
if (logger)
logger->e("Unable to add certificate id to request");
return {};
}
if (nonce)
OCSP_request_add1_nonce(request->req.get(), nullptr, -1);
int size;
uint8_t* data {nullptr};
if ((size = i2d_OCSP_REQUEST(request->req.get(), &data)) <= 0) {
if (logger)
logger->e("Unable to encode ocsp request");
return {};
}
if (data == nullptr) {
if (logger)
logger->e("Unable to allocte memory");
return {};
}
request->data = std::vector<uint8_t>(data, data+size);
free(data);
return request;
}
bool
ocspValidateResponse(const OscpRequestInfo& info, STACK_OF(X509)* fullchain, const std::string& response, X509_STORE *store, const std::shared_ptr<Logger>& logger)
{
ASN1_GENERALIZEDTIME *revtime = nullptr, *thisupd = nullptr, *nextupd = nullptr;
const uint8_t* p = (const uint8_t*)response.data();
int status, cert_status=0, crl_reason=0;
time_t now, rev_t = -1, this_t, next_t;
OCSP_RESPONSE *resp;
OCSP_BASICRESP *bresp;
OCSP_CERTID *cid;
X509* cert = cert_from_chain(fullchain);
if (cert == nullptr) {
if (logger)
logger->e("No certificate found");
return false;
}
X509* issuer = issuer_from_chain(fullchain);
if (issuer == nullptr) {
if (logger)
logger->e("Unable to find issuer for cert");
return false;
}
if ((cid = OCSP_cert_to_id(nullptr, cert, issuer)) == nullptr) {
if (logger)
logger->e("Unable to get issuer cert/CID");
return false;
}
if ((resp = d2i_OCSP_RESPONSE(nullptr, &p, response.size())) == nullptr) {
if (logger)
logger->e("OCSP response unserializable");
return false;
}
if ((bresp = OCSP_response_get1_basic(resp)) == nullptr) {
if (logger)
logger->e("Failed to load OCSP response");
return false;
}
if (OCSP_basic_verify(bresp, fullchain, store, OCSP_TRUSTOTHER) != 1) {
if (logger)
logger->w("OCSP verify failed");
return false;
}
printf("OCSP response signature validated\n");
status = OCSP_response_status(resp);
if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
if (logger)
logger->w("OCSP Failure: code %d (%s)", status, OCSP_response_status_str(status));
return false;
}
// Check the nonce if we sent one
if (OCSP_check_nonce(info.req.get(), bresp) <= 0) {
if (logger)
logger->w("No OCSP nonce, or mismatch");
return false;
}
if (OCSP_resp_find_status(bresp, cid, &cert_status, &crl_reason,
&revtime, &thisupd, &nextupd) != 1) {
if (logger)
logger->w("OCSP verify failed: no result for cert");
return false;
}
if (revtime && (rev_t = parse_ocsp_time(revtime)) == -1) {
if (logger)
logger->w("Unable to parse revocation time in OCSP reply");
return false;
}
// Belt and suspenders, Treat it as revoked if there is either
// a revocation time, or status revoked.
if (rev_t != -1 || cert_status == V_OCSP_CERTSTATUS_REVOKED) {
if (logger)
logger->w("Invalid OCSP reply: certificate is revoked");
if (rev_t != -1) {
if (logger)
logger->w("Certificate revoked at: %s", ctime(&rev_t));
}
return false;
}
if ((this_t = parse_ocsp_time(thisupd)) == -1) {
if (logger)
logger->w("unable to parse this update time in OCSP reply");
return false;
}
if ((next_t = parse_ocsp_time(nextupd)) == -1) {
if (logger)
logger->w("unable to parse next update time in OCSP reply");
return false;
}
// Don't allow this update to precede next update
if (this_t >= next_t) {
if (logger)
logger->w("Invalid OCSP reply: this update >= next update");
return false;
}
now = time(nullptr);
// Check that this update is not more than JITTER seconds in the future.
if (this_t > now + JITTER_SEC) {
if (logger)
logger->e("Invalid OCSP reply: this update is in the future (%s)", ctime(&this_t));
return false;
}
// Check that this update is not more than MAXSEC in the past.
if (this_t < now - MAXAGE_SEC) {
if (logger)
logger->e("Invalid OCSP reply: this update is too old (%s)", ctime(&this_t));
return false;
}
// Check that next update is still valid
if (next_t < now - JITTER_SEC) {
if (logger)
logger->w("Invalid OCSP reply: reply has expired (%s)", ctime(&next_t));
return false;
}
if (logger) {
logger->d("OCSP response validated");
logger->d(" This Update: %s", ctime(&this_t));
logger->d(" Next Update: %s", ctime(&next_t));
}
return true;
}
void
Connection::set_ssl_verification(const std::string& hostname, const asio::ssl::verify_mode verify_mode)
{
std::lock_guard<std::mutex> lock(mutex_);
if (ssl_socket_) {
// Set SNI Hostname (many hosts need this to handshake successfully)
SSL_set_tlsext_host_name(ssl_socket_->asio_ssl_stream().native_handle(), hostname.c_str());
ssl_socket_->asio_ssl_stream().set_verify_mode(verify_mode);
if (verify_mode != asio::ssl::verify_none) {
ssl_socket_->asio_ssl_stream().set_verify_callback([
id = id_, logger = logger_, hostname
] (bool preverified, asio::ssl::verify_context& ctx) -> bool {
X509* cert = X509_STORE_CTX_get_current_cert(ctx.native_handle());
if (logger) {
char subject_name[1024];
X509_NAME_oneline(X509_get_subject_name(cert), subject_name, 1024);
logger->d("[connection:%i] verify %s compliance to RFC 2818:\n%s", id, hostname.c_str(), subject_name);
}
// starts from CA and goes down the presented chain
auto verifier = asio::ssl::rfc2818_verification(hostname);
bool verified = verifier(preverified, ctx);
auto verify_ec = X509_STORE_CTX_get_error(ctx.native_handle());
if (verify_ec != 0 /*X509_V_OK*/ and logger)
logger->e("[http::connection:%i] ssl verification error=%i %d", id, verify_ec, verified);
if (verified) {
auto chain = X509_STORE_CTX_get1_chain(ctx.native_handle());
if (auto ocspInfo = ocspRequestFromCert(chain, logger)) {
if (logger)
logger->w("[http::connection:%i] TLS OCSP server: %s, request size: %zu", id, ocspInfo->url.c_str(), ocspInfo->data.size());
bool ocspVerified = false;
asio::io_context io_ctx;
auto ocspReq = std::make_shared<Request>(io_ctx, ocspInfo->url, [&](const Response& ocspResp){
if (ocspResp.status_code == 200) {
ocspVerified = ocspValidateResponse(*ocspInfo, chain, ocspResp.body, ctx.native_handle()->ctx, logger);
} else {
if (logger)
logger->w("[http::connection:%i] TLS OCSP check error", id);
}
}, logger);
ocspReq->set_method(restinio::http_method_post());
ocspReq->set_header_field(restinio::http_field_t::content_type, "application/ocsp-request");
ocspReq->set_body({ocspInfo->data.begin(), ocspInfo->data.end()});
ocspReq->send();
io_ctx.run();
if (not ocspVerified)
return false;
}
}
return verified;
}
);
}
}
}
asio::streambuf&
Connection::input()
{
return write_buf_;
}
std::string
Connection::read_bytes(size_t bytes)
{
std::lock_guard<std::mutex> lock(mutex_);
if (bytes == 0)
bytes = read_buf_.in_avail();
std::string content;
content.resize(bytes);
auto rb = istream_.readsome(&content[0], bytes);
content.resize(rb);
return content;
}
std::string
Connection::read_until(const char delim)
{
std::string content;
std::getline(istream_, content, delim);
return content;
}
void
Connection::async_connect(std::vector<asio::ip::tcp::endpoint>&& endpoints, ConnectHandlerCb cb)
{
std::lock_guard<std::mutex> lock(mutex_);
if (ssl_socket_)
asio::async_connect(ssl_socket_->lowest_layer(), std::move(endpoints), wrapCallabck(std::move(cb)));
else if (socket_)
asio::async_connect(*socket_, std::move(endpoints), wrapCallabck(std::move(cb)));
else if (cb)
cb(asio::error::operation_aborted, {});
}
void
Connection::async_handshake(HandlerCb cb)
{
std::lock_guard<std::mutex> lock(mutex_);
if (ssl_socket_) {
std::weak_ptr<Connection> wthis = shared_from_this();
ssl_socket_->async_handshake(asio::ssl::stream<asio::ip::tcp::socket>::client,
[wthis, cb](const asio::error_code& ec)
{
if (ec == asio::error::operation_aborted)
return;
if (auto sthis = wthis.lock()) {
auto& this_ = *sthis;
auto verify_ec = SSL_get_verify_result(this_.ssl_socket_->asio_ssl_stream().native_handle());
if (this_.logger_) {
if (verify_ec == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT /*18*/
|| verify_ec == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN /*19*/)
this_.logger_->d("[connection:%i] self-signed certificate in handshake: %i", this_.id_, verify_ec);
else if (verify_ec != X509_V_OK)
this_.logger_->e("[connection:%i] verify handshake error: %i", this_.id_, verify_ec);
else
this_.logger_->w("[connection:%i] verify handshake success", this_.id_);
}
}
if (cb)
cb(ec);
});
}
else if (socket_)
cb(asio::error::no_protocol_option);
else if (cb)
cb(asio::error::operation_aborted);
}
void
Connection::async_write(BytesHandlerCb cb)
{
std::lock_guard<std::mutex> lock(mutex_);
if (!is_open()) {
if (cb) ctx_.post([cb](){ cb(asio::error::broken_pipe, 0); });
return;
}
if (ssl_socket_) asio::async_write(*ssl_socket_, write_buf_, wrapCallabck(std::move(cb)));
else if (socket_) asio::async_write(*socket_, write_buf_, wrapCallabck(std::move(cb)));
else if (cb) ctx_.post([cb](){ cb(asio::error::operation_aborted, 0); });
}
void
Connection::async_read_until(const char* delim, BytesHandlerCb cb)
{
std::lock_guard<std::mutex> lock(mutex_);
if (!is_open()) {
if (cb) ctx_.post([cb](){ cb(asio::error::broken_pipe, 0); });
return;
}
if (ssl_socket_) asio::async_read_until(*ssl_socket_, read_buf_, delim, wrapCallabck(std::move(cb)));
else if (socket_) asio::async_read_until(*socket_, read_buf_, delim, wrapCallabck(std::move(cb)));
else if (cb) ctx_.post([cb](){ cb(asio::error::operation_aborted, 0); });
}
void
Connection::async_read_until(char delim, BytesHandlerCb cb)
{
std::lock_guard<std::mutex> lock(mutex_);
if (!is_open()) {
if (cb) ctx_.post([cb](){ cb(asio::error::broken_pipe, 0); });
return;
}
if (ssl_socket_) asio::async_read_until(*ssl_socket_, read_buf_, delim, wrapCallabck(std::move(cb)));
else if (socket_) asio::async_read_until(*socket_, read_buf_, delim, wrapCallabck(std::move(cb)));
else if (cb) ctx_.post([cb](){ cb(asio::error::operation_aborted, 0); });
}
void
Connection::async_read(size_t bytes, BytesHandlerCb cb)
{
std::lock_guard<std::mutex> lock(mutex_);
if (!is_open()) {
if (cb) ctx_.post([cb](){ cb(asio::error::broken_pipe, 0); });
return;
}
if (ssl_socket_) asio::async_read(*ssl_socket_, read_buf_, asio::transfer_exactly(bytes), wrapCallabck(std::move(cb)));
else if (socket_) asio::async_read(*socket_, read_buf_, asio::transfer_exactly(bytes), wrapCallabck(std::move(cb)));
else if (cb) ctx_.post([cb](){ cb(asio::error::operation_aborted, 0); });
}
void
Connection::async_read_some(size_t bytes, BytesHandlerCb cb)
{
std::lock_guard<std::mutex> lock(mutex_);
if (!is_open()) {
if (cb) ctx_.post([cb](){ cb(asio::error::broken_pipe, 0); });
return;
}
auto buf = read_buf_.prepare(bytes);
auto onEnd = [this_=shared_from_this(), cb=std::move(cb)](const asio::error_code& ec, size_t t){
this_->read_buf_.commit(t);
cb(ec, t);
};
if (ssl_socket_) ssl_socket_->async_read_some(buf, onEnd);
else socket_->async_read_some(buf, onEnd);
}
void
Connection::timeout(const std::chrono::seconds timeout, HandlerCb cb)
{
if (!is_open()){
if (logger_)
logger_->e("[connection:%i] closed, can't timeout", id_);
if (cb)
cb(asio::error::operation_aborted);
return;
}
if (!timeout_timer_)
timeout_timer_ = std::make_unique<asio::steady_timer>(ctx_);
timeout_timer_->expires_at(std::chrono::steady_clock::now() + timeout);
timeout_timer_->async_wait([id=id_, logger=logger_, cb](const asio::error_code &ec){
if (ec == asio::error::operation_aborted)
return;
else if (ec){
if (logger)
logger->e("[connection:%i] timeout error: %s", id, ec.message().c_str());
}
if (cb)
cb(ec);
});
}
// Resolver
Resolver::Resolver(asio::io_context& ctx, const std::string& url, std::shared_ptr<dht::Logger> logger)
: url_(url), resolver_(ctx), destroyed_(std::make_shared<bool>(false)), logger_(logger)
{
resolve(url_.host, url_.service.empty() ? url_.protocol : url_.service);
}
Resolver::Resolver(asio::io_context& ctx, const std::string& host, const std::string& service,
const bool ssl, std::shared_ptr<dht::Logger> logger)
: resolver_(ctx), destroyed_(std::make_shared<bool>(false)), logger_(logger)
{
url_.host = host;
url_.service = service;
url_.protocol = (ssl ? "https" : "http");
resolve(url_.host, url_.service.empty() ? url_.protocol : url_.service);
}
Resolver::Resolver(asio::io_context& ctx, std::vector<asio::ip::tcp::endpoint> endpoints, const bool ssl,
std::shared_ptr<dht::Logger> logger)
: resolver_(ctx), destroyed_(std::make_shared<bool>(false)), logger_(logger)
{
url_.protocol = (ssl ? "https" : "http");
endpoints_ = std::move(endpoints);
completed_ = true;
}
Resolver::~Resolver()
{
decltype(cbs_) cbs;
{
std::lock_guard<std::mutex> lock(mutex_);
cbs = std::move(cbs_);
}
while (not cbs.empty()){
auto cb = cbs.front();
if (cb)
cb(asio::error::operation_aborted, {});
cbs.pop();
}
*destroyed_ = true;
}
inline
std::vector<asio::ip::tcp::endpoint>
filter(const std::vector<asio::ip::tcp::endpoint>& epts, sa_family_t family)
{
if (family == AF_UNSPEC)
return epts;
std::vector<asio::ip::tcp::endpoint> ret;
for (const auto& ep : epts) {
if (family == AF_INET && ep.address().is_v4())
ret.emplace_back(ep);
else if (family == AF_INET6 && ep.address().is_v6())
ret.emplace_back(ep);
}
return ret;
}
void
Resolver::add_callback(ResolverCb cb, sa_family_t family)
{
std::lock_guard<std::mutex> lock(mutex_);
if (!completed_)
cbs_.emplace(family == AF_UNSPEC ? std::move(cb) : [cb, family](const asio::error_code& ec, const std::vector<asio::ip::tcp::endpoint>& endpoints){
if (ec)
cb(ec, endpoints);
else
cb(ec, filter(endpoints, family));
});
else
cb(ec_, family == AF_UNSPEC ? endpoints_ : filter(endpoints_, family));
}
void
Resolver::resolve(const std::string& host, const std::string& service)
{
asio::ip::tcp::resolver::query query_(host, service);
resolver_.async_resolve(query_, [this, host, service, destroyed = destroyed_]
(const asio::error_code& ec, asio::ip::tcp::resolver::results_type endpoints)
{
if (ec == asio::error::operation_aborted or *destroyed)
return;
if (logger_) {
if (ec)
logger_->e("[http:client] [resolver] error for %s:%s: %s",
host.c_str(), service.c_str(), ec.message().c_str());
}
decltype(cbs_) cbs;
{
std::lock_guard<std::mutex> lock(mutex_);
ec_ = ec;
endpoints_ = std::vector<asio::ip::tcp::endpoint>{endpoints.begin(), endpoints.end()};
completed_ = true;
cbs = std::move(cbs_);
}
while (not cbs.empty()){
auto cb = cbs.front();
if (cb)
cb(ec, endpoints_);
cbs.pop();
}
});
}
// Request
std::atomic_uint Request::ids_ {1};
Request::Request(asio::io_context& ctx, const std::string& url, const Json::Value& json, OnJsonCb jsoncb,
std::shared_ptr<dht::Logger> logger)
: logger_(std::move(logger)), id_(Request::ids_++), ctx_(ctx),
resolver_(std::make_shared<Resolver>(ctx, url, logger))
{
init_default_headers();
set_header_field(restinio::http_field_t::content_type, HTTP_HEADER_CONTENT_TYPE_JSON);
set_header_field(restinio::http_field_t::accept, HTTP_HEADER_CONTENT_TYPE_JSON);
Json::StreamWriterBuilder wbuilder;
set_method(restinio::http_method_post());
set_body(Json::writeString(wbuilder, json));
add_on_done_callback([this, jsoncb](const Response& response){
Json::Value json;
if (response.status_code != 0) {
std::string err;
Json::CharReaderBuilder rbuilder;
auto reader = std::unique_ptr<Json::CharReader>(rbuilder.newCharReader());
if (!reader->parse(response.body.data(), response.body.data() + response.body.size(), &json, &err) and logger_)
logger_->e("[http:request:%i] can't parse response to json", id_, err.c_str());
}
if (jsoncb)
jsoncb(std::move(json), response);
});
}
Request::Request(asio::io_context& ctx, const std::string& url, OnJsonCb jsoncb, std::shared_ptr<dht::Logger> logger)
: logger_(std::move(logger)), id_(Request::ids_++), ctx_(ctx),
resolver_(std::make_shared<Resolver>(ctx, url, logger))
{
init_default_headers();
set_header_field(restinio::http_field_t::accept, HTTP_HEADER_CONTENT_TYPE_JSON);
Json::StreamWriterBuilder wbuilder;
set_method(restinio::http_method_get());
add_on_done_callback([this, jsoncb](const Response& response) {
Json::Value json;
if (response.status_code != 0) {
std::string err;
Json::CharReaderBuilder rbuilder;
auto reader = std::unique_ptr<Json::CharReader>(rbuilder.newCharReader());
if (!reader->parse(response.body.data(), response.body.data() + response.body.size(), &json, &err) and logger_)
logger_->e("[http:request:%i] can't parse response to json", id_, err.c_str());
}
if (jsoncb)
jsoncb(std::move(json), response);
});
}
Request::Request(asio::io_context& ctx, const std::string& url, std::shared_ptr<dht::Logger> logger)
: logger_(logger), id_(Request::ids_++), ctx_(ctx),
resolver_(std::make_shared<Resolver>(ctx, url, logger))
{
init_default_headers();
}
Request::Request(asio::io_context& ctx, const std::string& url, OnDoneCb onDone, std::shared_ptr<dht::Logger> logger)
: logger_(logger), id_(Request::ids_++), ctx_(ctx), resolver_(std::make_shared<Resolver>(ctx, url, logger))
{
init_default_headers();
add_on_done_callback(std::move(onDone));
}
Request::Request(asio::io_context& ctx, const std::string& host, const std::string& service,
const bool ssl, std::shared_ptr<dht::Logger> logger)
: logger_(logger), id_(Request::ids_++), ctx_(ctx),
resolver_(std::make_shared<Resolver>(ctx, host, service, ssl, logger))
{
init_default_headers();
}
Request::Request(asio::io_context& ctx, std::shared_ptr<Resolver> resolver, sa_family_t family)
: logger_(resolver->getLogger()), id_(Request::ids_++), ctx_(ctx), family_(family), resolver_(resolver)
{
init_default_headers();
}
Request::Request(asio::io_context& ctx, std::vector<asio::ip::tcp::endpoint>&& endpoints, const bool ssl,
std::shared_ptr<dht::Logger> logger)
: logger_(logger), id_(Request::ids_++), ctx_(ctx),
resolver_(std::make_shared<Resolver>(ctx, std::move(endpoints), ssl, logger))
{
init_default_headers();
}
Request::Request(asio::io_context& ctx, std::shared_ptr<Resolver> resolver, const std::string& target, sa_family_t family)
: logger_(resolver->getLogger()), id_(Request::ids_++), ctx_(ctx), family_(family), resolver_(resolver)
{
set_header_field(restinio::http_field_t::host, get_url().host + ":" + get_url().service);
set_target(Url(target).target);
}
Request::~Request()
{
resolver_.reset();
terminate(asio::error::connection_aborted);
}
void
Request::init_default_headers()
{
const auto& url = resolver_->get_url();
set_header_field(restinio::http_field_t::user_agent, "Mozilla/5.0");
set_header_field(restinio::http_field_t::accept, "text/html");
set_target(url.target);
}
void
Request::cancel()
{
if (auto c = conn_)
c->close();
}
void
Request::set_connection(std::shared_ptr<Connection> connection) {
conn_ = std::move(connection);
}
std::shared_ptr<Connection>
Request::get_connection() const {
return conn_;
}
void
Request::set_certificate_authority(std::shared_ptr<dht::crypto::Certificate> certificate) {
server_ca_ = certificate;
}
void
Request::set_identity(const dht::crypto::Identity& identity) {
client_identity_ = identity;
}
void
Request::set_logger(std::shared_ptr<dht::Logger> logger) {
logger_ = logger;
}
void
Request::set_header(restinio::http_request_header_t header)
{
header_ = header;
}
void
Request::set_method(restinio::http_method_id_t method) {
header_.method(method);
}
void
Request::set_target(std::string target) {
header_.request_target(target.empty() ? "/" : std::move(target));
}
void
Request::set_header_field(restinio::http_field_t field, std::string value) {
headers_[field] = std::move(value);
}
void
Request::set_connection_type(restinio::http_connection_header_t connection) {
connection_type_ = connection;
}
void
Request::set_body(std::string body) {
body_ = std::move(body);
}
void
Request::set_auth(const std::string& username, const std::string& password)
{
std::vector<uint8_t> creds;
creds.reserve(username.size() + password.size() + 1);
creds.insert(creds.end(), username.begin(), username.end());
creds.emplace_back(':');
creds.insert(creds.end(), password.begin(), password.end());
set_header_field(restinio::http_field_t::authorization, "Basic " + base64_encode(creds));
}
void
Request::build()
{
std::stringstream request;
bool append_body = !body_.empty();
// first header
request << header_.method().c_str() << " " << header_.request_target() << " " <<
"HTTP/" << header_.http_major() << "." << header_.http_minor() << "\r\n";
// other headers
for (auto header: headers_){
request << restinio::field_to_string(header.first) << ": " << header.second << "\r\n";
if (header.first == restinio::http_field_t::expect and header.second == "100-continue")
append_body = false;
}
// last connection header
const char* conn_str = nullptr;
switch (connection_type_){
case restinio::http_connection_header_t::keep_alive:
conn_str = "keep-alive";
break;
case restinio::http_connection_header_t::upgrade:
if (logger_)
logger_->e("Unsupported connection type 'upgrade', fallback to 'close'");
// fallthrough
case restinio::http_connection_header_t::close:
conn_str = "close"; // default
break;
}
if (conn_str)
request << "Connection: " << conn_str << "\r\n";
// body & content-length
if (append_body) {
request << "Content-Length: " << body_.size() << "\r\n\r\n"
<< body_;
} else
request << "\r\n";
request_ = request.str();
}
void
Request::add_on_status_callback(OnStatusCb cb) {
cbs_.on_status = std::move(cb);
}
void
Request::add_on_body_callback(OnDataCb cb) {
cbs_.on_body = std::move(cb);
}
void
Request::add_on_state_change_callback(OnStateChangeCb cb) {
cbs_.on_state_change = std::move(cb);
}
void
Request::add_on_done_callback(OnDoneCb cb) {
add_on_state_change_callback([onDone=std::move(cb)](State state, const Response& response){
if (state == Request::State::DONE)
onDone(response);
});
}
void
Request::notify_state_change(State state) {
state_ = state;
if (cbs_.on_state_change)
cbs_.on_state_change(state, response_);
}
void
Request::init_parser()
{
response_.request = shared_from_this();
if (!parser_)
parser_ = std::make_unique<http_parser>();
http_parser_init(parser_.get(), HTTP_RESPONSE);
parser_->data = static_cast<void*>(this);
if (!parser_s_)
parser_s_ = std::make_unique<http_parser_settings>();
http_parser_settings_init(parser_s_.get());
cbs_.on_status = [this, statusCb = std::move(cbs_.on_status)](unsigned int status_code){
response_.status_code = status_code;
if (statusCb)
statusCb(status_code);
};
auto header_field = std::make_shared<std::string>();
cbs_.on_header_field = [header_field](const char* at, size_t length) {
*header_field = std::string(at, length);
};
cbs_.on_header_value = [this, header_field](const char* at, size_t length) {
response_.headers[*header_field] = std::string(at, length);
};
// http_parser raw c callback (note: no context can be passed into them)
parser_s_->on_status = [](http_parser* parser, const char* /*at*/, size_t /*length*/) -> int {
static_cast<Request*>(parser->data)->cbs_.on_status(parser->status_code);
return 0;
};
parser_s_->on_header_field = [](http_parser* parser, const char* at, size_t length) -> int {
static_cast<Request*>(parser->data)->cbs_.on_header_field(at, length);
return 0;
};
parser_s_->on_header_value = [](http_parser* parser, const char* at, size_t length) -> int {
static_cast<Request*>(parser->data)->cbs_.on_header_value(at, length);
return 0;
};
parser_s_->on_body = [](http_parser* parser, const char* at, size_t length) -> int {
static_cast<Request*>(parser->data)->onBody(at, length);
return 0;
};
parser_s_->on_headers_complete = [](http_parser* parser) -> int {
static_cast<Request*>(parser->data)->onHeadersComplete();
return 0;
};
parser_s_->on_message_complete = [](http_parser* parser) -> int {
static_cast<Request*>(parser->data)->onComplete();
return 0;
};
}
void
Request::connect(std::vector<asio::ip::tcp::endpoint>&& endpoints, HandlerCb cb)
{
if (endpoints.empty()){
if (logger_)
logger_->e("[http:request:%i] connect: no endpoints provided", id_);
if (cb)
cb(asio::error::connection_aborted);
return;
}
if (logger_){
std::string eps = "";
for (const auto& endpoint : endpoints)
eps.append(endpoint.address().to_string() + ":" + std::to_string(endpoint.port()) + " ");
logger_->d("[http:request:%i] connect begin: %s", id_, eps.c_str());
}
bool isHttps = get_url().protocol == "https";
if (isHttps) {
if (server_ca_ or client_identity_.first)
conn_ = std::make_shared<Connection>(ctx_, server_ca_, client_identity_, logger_);
else
conn_ = std::make_shared<Connection>(ctx_, true/*ssl*/, logger_);
conn_->set_ssl_verification(get_url().host, asio::ssl::verify_peer | asio::ssl::verify_fail_if_no_peer_cert);
}
else
conn_ = std::make_shared<Connection>(ctx_, false/*ssl*/, logger_);
// try to connect to any until one works
std::weak_ptr<Request> wthis = shared_from_this();
conn_->async_connect(std::move(endpoints), [wthis, cb, isHttps]
(const asio::error_code& ec, const asio::ip::tcp::endpoint& endpoint){
auto sthis = wthis.lock();
if (not sthis)
return;
auto& this_ = *sthis;
std::lock_guard<std::mutex> lock(this_.mutex_);
if (ec == asio::error::operation_aborted){
this_.terminate(ec);
return;
}
else if (ec) {
if (this_.logger_)
this_.logger_->e("[http:request:%i] connect failed with all endpoints: %s", this_.id_, ec.message().c_str());
} else {
const auto& url = this_.get_url();
auto port = endpoint.port();
if ((!isHttps && port == (in_port_t)80)
|| (isHttps && port == (in_port_t)443))
this_.set_header_field(restinio::http_field_t::host, url.host);
else
this_.set_header_field(restinio::http_field_t::host, url.host + ":" + std::to_string(port));
if (isHttps) {
if (this_.conn_ and this_.conn_->is_open() and this_.conn_->is_ssl()) {
this_.conn_->async_handshake([id = this_.id_, cb, logger = this_.logger_](const asio::error_code& ec){
if (ec == asio::error::operation_aborted)
return;
if (ec and logger)
logger->e("[http:request:%i] handshake error: %s", id, ec.message().c_str());
//else if (logger)
// logger->d("[http:request:%i] handshake success", id);
if (cb)
cb(ec);
});
}
else if (cb)
cb(asio::error::operation_aborted);
return;
}
}
if (cb)
cb(ec);
});
}
void
Request::send()
{
notify_state_change(State::CREATED);
std::weak_ptr<Request> wthis = shared_from_this();
resolver_->add_callback([wthis](const asio::error_code& ec,
std::vector<asio::ip::tcp::endpoint> endpoints) {
if (auto sthis = wthis.lock()) {
auto& this_ = *sthis;
std::lock_guard<std::mutex> lock(this_.mutex_);
if (ec){
if (this_.logger_)
this_.logger_->e("[http:request:%i] resolve error: %s", this_.id_, ec.message().c_str());
this_.terminate(asio::error::connection_aborted);
}
else if (!this_.conn_ or !this_.conn_->is_open()) {
this_.connect(std::move(endpoints), [wthis](const asio::error_code &ec) {
if (auto sthis = wthis.lock()) {
if (ec)
sthis->terminate(asio::error::not_connected);
else
sthis->post();
}
});
}
else
this_.post();
}
}, family_);
}
void
Request::post()
{
if (!conn_ or !conn_->is_open()){
terminate(asio::error::not_connected);
return;
}
build();
init_parser();
if (logger_)
logger_->d("[http:request:%i] sending %zu bytes", id_, request_.size());
// write the request to buffer
std::ostream request_stream(&conn_->input());
request_stream << request_;
// send the request
notify_state_change(State::SENDING);
std::weak_ptr<Request> wthis = shared_from_this();
conn_->async_write([wthis](const asio::error_code& ec, size_t) {
if (auto sthis = wthis.lock())
sthis->handle_request(ec);
});
}
void
Request::terminate(const asio::error_code& ec)
{
if (finishing_.exchange(true))
return;
response_.aborted = ec == asio::error::operation_aborted;
if (logger_) {
if (ec and ec != asio::error::eof and ec != asio::error::operation_aborted)
logger_->e("[http:request:%i] end with error: %s", id_, ec.message().c_str());
else
logger_->d("[http:request:%i] done with status code %u", id_, response_.status_code);
}
if (!parser_ or !http_should_keep_alive(parser_.get()))
if (auto c = conn_)
c->close();
notify_state_change(State::DONE);
}
void
Request::handle_request(const asio::error_code& ec)
{
std::lock_guard<std::mutex> lock(mutex_);
if (ec and ec != asio::error::eof){
terminate(ec);
return;
}
if (!conn_->is_open()){
terminate(asio::error::not_connected);
return;
}
// if (logger_)
// logger_->d("[http:request:%i] send success", id_);
// read response
notify_state_change(State::RECEIVING);
std::weak_ptr<Request> wthis = shared_from_this();
conn_->async_read_until(HTTP_HEADER_DELIM, [wthis](const asio::error_code& ec, size_t n_bytes){
if (auto sthis = wthis.lock())
sthis->handle_response(ec, n_bytes);
});
}
void
Request::handle_response(const asio::error_code& ec, size_t /* n_bytes */)
{
std::lock_guard<std::mutex> lock(mutex_);
if (ec && ec != asio::error::eof){
terminate(ec);
return;
}
auto request = (ec == asio::error::eof) ? std::string{} : conn_->read_bytes();
size_t ret = http_parser_execute(parser_.get(), parser_s_.get(), request.c_str(), request.size());
if (ret != request.size()) {
if (logger_)
logger_->e("Error parsing HTTP: %zu %s %s", ret,
http_errno_name(HTTP_PARSER_ERRNO(parser_)),
http_errno_description(HTTP_PARSER_ERRNO(parser_)));
terminate(asio::error::basic_errors::broken_pipe);
return;
}
if (state_ != State::DONE and parser_ and not http_body_is_final(parser_.get())) {
auto toRead = parser_->content_length ? std::min<uint64_t>(parser_->content_length, 64 * 1024) : 64 * 1024;
std::weak_ptr<Request> wthis = shared_from_this();
conn_->async_read_some(toRead, [wthis](const asio::error_code& ec, size_t bytes){
if (auto sthis = wthis.lock())
sthis->handle_response(ec, bytes);
});
}
}
void
Request::onBody(const char* at, size_t length)
{
if (cbs_.on_body)
cbs_.on_body(at, length);
else
response_.body.insert(response_.body.end(), at, at+length);
}
void
Request::onComplete() {
terminate(asio::error::eof);
}
void
Request::onHeadersComplete() {
notify_state_change(State::HEADER_RECEIVED);
if (response_.status_code == restinio::status_code::moved_permanently.raw_code() or
response_.status_code == restinio::status_code::found.raw_code())
{
auto location_it = response_.headers.find(restinio::field_to_string(restinio::http_field_t::location));
if (location_it == response_.headers.end()){
if (logger_)
logger_->e("[http:client] [request:%i] got redirect without location", id_);
terminate(asio::error::connection_aborted);
}
if (follow_redirect and num_redirect < MAX_REDIRECTS) {
auto newUrl = getRelativePath(get_url(), location_it->second);
if (logger_)
logger_->w("[http:client] [request:%i] redirect to %s", id_, newUrl.c_str());
auto next = std::make_shared<Request>(ctx_, newUrl, logger_);
next->set_method(header_.method());
next->headers_ = std::move(headers_);
next->body_ = std::move(body_);
next->cbs_ = std::move(cbs_);
next->num_redirect = num_redirect + 1;
next_ = next;
next->prev_ = shared_from_this();
next->send();
} else {
if (logger_)
logger_->e("[http:client] [request:%i] got redirect without location", id_);
terminate(asio::error::connection_aborted);
}
} else {
auto expect_it = headers_.find(restinio::http_field_t::expect);
if (expect_it != headers_.end() and (expect_it->second == "100-continue") and response_.status_code != 200){
notify_state_change(State::SENDING);
request_.append(body_);
std::ostream request_stream(&conn_->input());
request_stream << body_ << "\r\n";
std::weak_ptr<Request> wthis = shared_from_this();
conn_->async_write([wthis](const asio::error_code& ec, size_t) {
if (auto sthis = wthis.lock())
sthis->handle_request(ec);
});
}
}
}
bool startsWith(const std::string& haystack, const std::string& needle) {
return needle.length() <= haystack.length()
&& std::equal(needle.begin(), needle.end(), haystack.begin());
}
std::string
Request::getRelativePath(const Url& origin, const std::string& path)
{
if (startsWith(path, HTTP_PROTOCOL)
|| startsWith(path, HTTPS_PROTOCOL)
|| startsWith(path, ORIGIN_PROTOCOL)) {
// Absolute path
return path;
}
Url newPath = origin;
if (not path.empty() and path[0] == '/') {
newPath.target = path;
} else {
if (newPath.target.empty())
newPath.target.push_back('/');
newPath.target += path;
}
return newPath.toString();
}
const Response&
Request::await()
{
std::mutex mtx;
std::unique_lock<std::mutex> lock(mtx);
std::condition_variable cv;
bool ok {false};
add_on_done_callback([&](const Response& resp){
std::lock_guard<std::mutex> lk(mtx);
ok = true;
cv.notify_all();
});
cv.wait(lock, [&]{ return ok; });
return response_;
}
} // namespace http
} // namespace dht
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