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-rw-r--r--src/network/tcp_socket_handler.cpp572
1 files changed, 0 insertions, 572 deletions
diff --git a/src/network/tcp_socket_handler.cpp b/src/network/tcp_socket_handler.cpp
deleted file mode 100644
index e9984e3..0000000
--- a/src/network/tcp_socket_handler.cpp
+++ /dev/null
@@ -1,572 +0,0 @@
-#include <network/tcp_socket_handler.hpp>
-#include <network/dns_handler.hpp>
-
-#include <utils/timed_events.hpp>
-#include <utils/scopeguard.hpp>
-#include <network/poller.hpp>
-
-#include <logger/logger.hpp>
-#include <sys/socket.h>
-#include <sys/types.h>
-#include <stdexcept>
-#include <unistd.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <netdb.h>
-#include <cstring>
-#include <fcntl.h>
-#include <stdio.h>
-
-#include <iostream>
-
-#ifdef BOTAN_FOUND
-# include <botan/hex.h>
-
-Botan::AutoSeeded_RNG TCPSocketHandler::rng;
-Permissive_Credentials_Manager TCPSocketHandler::credential_manager;
-Botan::TLS::Policy TCPSocketHandler::policy;
-Botan::TLS::Session_Manager_In_Memory TCPSocketHandler::session_manager(TCPSocketHandler::rng);
-
-#endif
-
-#ifndef UIO_FASTIOV
-# define UIO_FASTIOV 8
-#endif
-
-using namespace std::string_literals;
-using namespace std::chrono_literals;
-
-namespace ph = std::placeholders;
-
-TCPSocketHandler::TCPSocketHandler(std::shared_ptr<Poller> poller):
- SocketHandler(poller, -1),
- use_tls(false),
- connected(false),
- connecting(false)
-#ifdef CARES_FOUND
- ,resolved(false),
- resolved4(false),
- resolved6(false),
- cares_addrinfo(nullptr),
- cares_error()
-#endif
-{}
-
-TCPSocketHandler::~TCPSocketHandler()
-{
-#ifdef CARES_FOUND
- this->free_cares_addrinfo();
-#endif
-}
-
-void TCPSocketHandler::init_socket(const struct addrinfo* rp)
-{
- if ((this->socket = ::socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) == -1)
- throw std::runtime_error("Could not create socket: "s + strerror(errno));
- int optval = 1;
- if (::setsockopt(this->socket, SOL_SOCKET, SO_KEEPALIVE, &optval, sizeof(optval)) == -1)
- log_warning("Failed to enable TCP keepalive on socket: " << strerror(errno));
- // Set the socket on non-blocking mode. This is useful to receive a EAGAIN
- // error when connect() would block, to not block the whole process if a
- // remote is not responsive.
- const int existing_flags = ::fcntl(this->socket, F_GETFL, 0);
- if ((existing_flags == -1) ||
- (::fcntl(this->socket, F_SETFL, existing_flags | O_NONBLOCK) == -1))
- throw std::runtime_error("Could not initialize socket: "s + strerror(errno));
-}
-
-void TCPSocketHandler::connect(const std::string& address, const std::string& port, const bool tls)
-{
- this->address = address;
- this->port = port;
- this->use_tls = tls;
-
- utils::ScopeGuard sg;
-
- struct addrinfo* addr_res;
-
- if (!this->connecting)
- {
- // Get the addrinfo from getaddrinfo (or ares_gethostbyname), only if
- // this is the first call of this function.
-#ifdef CARES_FOUND
- if (!this->resolved)
- {
- log_info("Trying to connect to " << address << ":" << port);
- // Start the asynchronous process of resolving the hostname. Once
- // the addresses have been found and `resolved` has been set to true
- // (but connecting will still be false), TCPSocketHandler::connect()
- // needs to be called, again.
- DNSHandler::instance.gethostbyname(address, this, AF_INET6);
- DNSHandler::instance.gethostbyname(address, this, AF_INET);
- return;
- }
- else
- {
- // The c-ares resolved the hostname and the available addresses
- // where saved in the cares_addrinfo linked list. Now, just use
- // this list to try to connect.
- addr_res = this->cares_addrinfo;
- if (!addr_res)
- {
- this->close();
- this->on_connection_failed(this->cares_error);
- return ;
- }
- }
-#else
- log_info("Trying to connect to " << address << ":" << port);
- struct addrinfo hints;
- memset(&hints, 0, sizeof(struct addrinfo));
- hints.ai_flags = 0;
- hints.ai_family = AF_UNSPEC;
- hints.ai_socktype = SOCK_STREAM;
- hints.ai_protocol = 0;
-
- const int res = ::getaddrinfo(address.c_str(), port.c_str(), &hints, &addr_res);
-
- if (res != 0)
- {
- log_warning("getaddrinfo failed: "s + gai_strerror(res));
- this->close();
- this->on_connection_failed(gai_strerror(res));
- return ;
- }
- // Make sure the alloced structure is always freed at the end of the
- // function
- sg.add_callback([&addr_res](){ freeaddrinfo(addr_res); });
-#endif
- }
- else
- { // This function is called again, use the saved addrinfo structure,
- // instead of re-doing the whole getaddrinfo process.
- addr_res = &this->addrinfo;
- }
-
- for (struct addrinfo* rp = addr_res; rp; rp = rp->ai_next)
- {
- if (!this->connecting)
- {
- try {
- this->init_socket(rp);
- }
- catch (const std::runtime_error& error) {
- log_error("Failed to init socket: " << error.what());
- break;
- }
- }
- if (::connect(this->socket, rp->ai_addr, rp->ai_addrlen) == 0
- || errno == EISCONN)
- {
- log_info("Connection success.");
- TimedEventsManager::instance().cancel("connection_timeout"s +
- std::to_string(this->socket));
- this->poller->add_socket_handler(this);
- this->connected = true;
- this->connecting = false;
-#ifdef BOTAN_FOUND
- if (this->use_tls)
- this->start_tls();
-#endif
- this->on_connected();
- return ;
- }
- else if (errno == EINPROGRESS || errno == EALREADY)
- { // retry this process later, when the socket
- // is ready to be written on.
- this->connecting = true;
- this->poller->add_socket_handler(this);
- this->poller->watch_send_events(this);
- // Save the addrinfo structure, to use it on the next call
- this->ai_addrlen = rp->ai_addrlen;
- memcpy(&this->ai_addr, rp->ai_addr, this->ai_addrlen);
- memcpy(&this->addrinfo, rp, sizeof(struct addrinfo));
- this->addrinfo.ai_addr = reinterpret_cast<struct sockaddr*>(&this->ai_addr);
- this->addrinfo.ai_next = nullptr;
- // If the connection has not succeeded or failed in 5s, we consider
- // it to have failed
- TimedEventsManager::instance().add_event(
- TimedEvent(std::chrono::steady_clock::now() + 5s,
- std::bind(&TCPSocketHandler::on_connection_timeout, this),
- "connection_timeout"s + std::to_string(this->socket)));
- return ;
- }
- log_info("Connection failed:" << strerror(errno));
- }
- log_error("All connection attempts failed.");
- this->close();
- this->on_connection_failed(strerror(errno));
- return ;
-}
-
-void TCPSocketHandler::on_connection_timeout()
-{
- this->close();
- this->on_connection_failed("connection timed out");
-}
-
-void TCPSocketHandler::connect()
-{
- this->connect(this->address, this->port, this->use_tls);
-}
-
-void TCPSocketHandler::on_recv()
-{
-#ifdef BOTAN_FOUND
- if (this->use_tls)
- this->tls_recv();
- else
-#endif
- this->plain_recv();
-}
-
-void TCPSocketHandler::plain_recv()
-{
- static constexpr size_t buf_size = 4096;
- char buf[buf_size];
- void* recv_buf = this->get_receive_buffer(buf_size);
-
- if (recv_buf == nullptr)
- recv_buf = buf;
-
- const ssize_t size = this->do_recv(recv_buf, buf_size);
-
- if (size > 0)
- {
- if (buf == recv_buf)
- {
- // data needs to be placed in the in_buf string, because no buffer
- // was provided to receive that data directly. The in_buf buffer
- // will be handled in parse_in_buffer()
- this->in_buf += std::string(buf, size);
- }
- this->parse_in_buffer(size);
- }
-}
-
-ssize_t TCPSocketHandler::do_recv(void* recv_buf, const size_t buf_size)
-{
- ssize_t size = ::recv(this->socket, recv_buf, buf_size, 0);
- if (0 == size)
- {
- this->on_connection_close("");
- this->close();
- }
- else if (-1 == size)
- {
- log_warning("Error while reading from socket: " << strerror(errno));
- // Remember if we were connecting, or already connected when this
- // happened, because close() sets this->connecting to false
- const auto were_connecting = this->connecting;
- this->close();
- if (were_connecting)
- this->on_connection_failed(strerror(errno));
- else
- this->on_connection_close(strerror(errno));
- }
- return size;
-}
-
-void TCPSocketHandler::on_send()
-{
- struct iovec msg_iov[UIO_FASTIOV] = {};
- struct msghdr msg{nullptr, 0,
- msg_iov,
- 0, nullptr, 0, 0};
- for (std::string& s: this->out_buf)
- {
- // unconsting the content of s is ok, sendmsg will never modify it
- msg_iov[msg.msg_iovlen].iov_base = const_cast<char*>(s.data());
- msg_iov[msg.msg_iovlen].iov_len = s.size();
- if (++msg.msg_iovlen == UIO_FASTIOV)
- break;
- }
- ssize_t res = ::sendmsg(this->socket, &msg, MSG_NOSIGNAL);
- if (res < 0)
- {
- log_error("sendmsg failed: " << strerror(errno));
- this->on_connection_close(strerror(errno));
- this->close();
- }
- else
- {
- // remove all the strings that were successfully sent.
- for (auto it = this->out_buf.begin();
- it != this->out_buf.end();)
- {
- if (static_cast<size_t>(res) >= (*it).size())
- {
- res -= (*it).size();
- it = this->out_buf.erase(it);
- }
- else
- {
- // If one string has partially been sent, we use substr to
- // crop it
- if (res > 0)
- (*it) = (*it).substr(res, std::string::npos);
- break;
- }
- }
- if (this->out_buf.empty())
- this->poller->stop_watching_send_events(this);
- }
-}
-
-void TCPSocketHandler::close()
-{
- TimedEventsManager::instance().cancel("connection_timeout"s +
- std::to_string(this->socket));
- if (this->connected || this->connecting)
- this->poller->remove_socket_handler(this->get_socket());
- if (this->socket != -1)
- {
- ::close(this->socket);
- this->socket = -1;
- }
- this->connected = false;
- this->connecting = false;
- this->in_buf.clear();
- this->out_buf.clear();
- this->port.clear();
-}
-
-void TCPSocketHandler::send_data(std::string&& data)
-{
-#ifdef BOTAN_FOUND
- if (this->use_tls)
- this->tls_send(std::move(data));
- else
-#endif
- this->raw_send(std::move(data));
-}
-
-void TCPSocketHandler::raw_send(std::string&& data)
-{
- if (data.empty())
- return ;
- this->out_buf.emplace_back(std::move(data));
- if (this->connected)
- this->poller->watch_send_events(this);
-}
-
-void TCPSocketHandler::send_pending_data()
-{
- if (this->connected && !this->out_buf.empty())
- this->poller->watch_send_events(this);
-}
-
-bool TCPSocketHandler::is_connected() const
-{
- return this->connected;
-}
-
-bool TCPSocketHandler::is_connecting() const
-{
-#ifdef CARES_FOUND
- return this->connecting || !this->resolved;
-#else
- return this->connecting;
-#endif
-}
-
-void* TCPSocketHandler::get_receive_buffer(const size_t) const
-{
- return nullptr;
-}
-
-#ifdef BOTAN_FOUND
-void TCPSocketHandler::start_tls()
-{
- Botan::TLS::Server_Information server_info(this->address, "irc", std::stoul(this->port));
- this->tls = std::make_unique<Botan::TLS::Client>(
- std::bind(&TCPSocketHandler::tls_output_fn, this, ph::_1, ph::_2),
- std::bind(&TCPSocketHandler::tls_data_cb, this, ph::_1, ph::_2),
- std::bind(&TCPSocketHandler::tls_alert_cb, this, ph::_1, ph::_2, ph::_3),
- std::bind(&TCPSocketHandler::tls_handshake_cb, this, ph::_1),
- session_manager, credential_manager, policy,
- rng, server_info, Botan::TLS::Protocol_Version::latest_tls_version());
-}
-
-void TCPSocketHandler::tls_recv()
-{
- static constexpr size_t buf_size = 4096;
- char recv_buf[buf_size];
-
- const ssize_t size = this->do_recv(recv_buf, buf_size);
- if (size > 0)
- {
- const bool was_active = this->tls->is_active();
- this->tls->received_data(reinterpret_cast<const Botan::byte*>(recv_buf),
- static_cast<size_t>(size));
- if (!was_active && this->tls->is_active())
- this->on_tls_activated();
- }
-}
-
-void TCPSocketHandler::tls_send(std::string&& data)
-{
- if (this->tls->is_active())
- {
- const bool was_active = this->tls->is_active();
- if (!this->pre_buf.empty())
- {
- this->tls->send(reinterpret_cast<const Botan::byte*>(this->pre_buf.data()),
- this->pre_buf.size());
- this->pre_buf = "";
- }
- if (!data.empty())
- this->tls->send(reinterpret_cast<const Botan::byte*>(data.data()),
- data.size());
- if (!was_active && this->tls->is_active())
- this->on_tls_activated();
- }
- else
- this->pre_buf += data;
-}
-
-void TCPSocketHandler::tls_data_cb(const Botan::byte* data, size_t size)
-{
- this->in_buf += std::string(reinterpret_cast<const char*>(data),
- size);
- if (!this->in_buf.empty())
- this->parse_in_buffer(size);
-}
-
-void TCPSocketHandler::tls_output_fn(const Botan::byte* data, size_t size)
-{
- this->raw_send(std::string(reinterpret_cast<const char*>(data), size));
-}
-
-void TCPSocketHandler::tls_alert_cb(Botan::TLS::Alert alert, const Botan::byte*, size_t)
-{
- log_debug("tls_alert: " << alert.type_string());
-}
-
-bool TCPSocketHandler::tls_handshake_cb(const Botan::TLS::Session& session)
-{
- log_debug("Handshake with " << session.server_info().hostname() << " complete."
- << " Version: " << session.version().to_string()
- << " using " << session.ciphersuite().to_string());
- if (!session.session_id().empty())
- log_debug("Session ID " << Botan::hex_encode(session.session_id()));
- if (!session.session_ticket().empty())
- log_debug("Session ticket " << Botan::hex_encode(session.session_ticket()));
- return true;
-}
-
-void TCPSocketHandler::on_tls_activated()
-{
- this->send_data("");
-}
-
-#endif // BOTAN_FOUND
-
-#ifdef CARES_FOUND
-
-void TCPSocketHandler::on_hostname4_resolved(int status, struct hostent* hostent)
-{
- this->resolved4 = true;
- if (status == ARES_SUCCESS)
- this->fill_ares_addrinfo4(hostent);
- else
- this->cares_error = ::ares_strerror(status);
-
- if (this->resolved4 && this->resolved6)
- {
- this->resolved = true;
- this->connect();
- }
-}
-
-void TCPSocketHandler::on_hostname6_resolved(int status, struct hostent* hostent)
-{
- this->resolved6 = true;
- if (status == ARES_SUCCESS)
- this->fill_ares_addrinfo6(hostent);
- else
- this->cares_error = ::ares_strerror(status);
-
- if (this->resolved4 && this->resolved6)
- {
- this->resolved = true;
- this->connect();
- }
-}
-
-void TCPSocketHandler::fill_ares_addrinfo4(const struct hostent* hostent)
-{
- struct addrinfo* prev = this->cares_addrinfo;
- struct in_addr** address = reinterpret_cast<struct in_addr**>(hostent->h_addr_list);
-
- while (*address)
- {
- // Create a new addrinfo list element, and fill it
- struct addrinfo* current = new struct addrinfo;
- current->ai_flags = 0;
- current->ai_family = hostent->h_addrtype;
- current->ai_socktype = SOCK_STREAM;
- current->ai_protocol = 0;
- current->ai_addrlen = sizeof(struct sockaddr_in);
-
- struct sockaddr_in* addr = new struct sockaddr_in;
- addr->sin_family = hostent->h_addrtype;
- addr->sin_port = htons(strtoul(this->port.data(), nullptr, 10));
- addr->sin_addr.s_addr = (*address)->s_addr;
-
- current->ai_addr = reinterpret_cast<struct sockaddr*>(addr);
- current->ai_next = nullptr;
- current->ai_canonname = nullptr;
-
- current->ai_next = prev;
- this->cares_addrinfo = current;
- prev = current;
- ++address;
- }
-}
-
-void TCPSocketHandler::fill_ares_addrinfo6(const struct hostent* hostent)
-{
- struct addrinfo* prev = this->cares_addrinfo;
- struct in6_addr** address = reinterpret_cast<struct in6_addr**>(hostent->h_addr_list);
-
- while (*address)
- {
- // Create a new addrinfo list element, and fill it
- struct addrinfo* current = new struct addrinfo;
- current->ai_flags = 0;
- current->ai_family = hostent->h_addrtype;
- current->ai_socktype = SOCK_STREAM;
- current->ai_protocol = 0;
- current->ai_addrlen = sizeof(struct sockaddr_in6);
-
- struct sockaddr_in6* addr = new struct sockaddr_in6;
- addr->sin6_family = hostent->h_addrtype;
- addr->sin6_port = htons(strtoul(this->port.data(), nullptr, 10));
- ::memcpy(addr->sin6_addr.s6_addr, (*address)->s6_addr, 16);
- addr->sin6_flowinfo = 0;
- addr->sin6_scope_id = 0;
-
- current->ai_addr = reinterpret_cast<struct sockaddr*>(addr);
- current->ai_next = nullptr;
- current->ai_canonname = nullptr;
-
- current->ai_next = prev;
- this->cares_addrinfo = current;
- prev = current;
- ++address;
- }
-}
-
-void TCPSocketHandler::free_cares_addrinfo()
-{
- while (this->cares_addrinfo)
- {
- delete this->cares_addrinfo->ai_addr;
- auto next = this->cares_addrinfo->ai_next;
- delete this->cares_addrinfo;
- this->cares_addrinfo = next;
- }
-}
-
-#endif // CARES_FOUND