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Remove all the libs that are now in louloulibs

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This commit is contained in:
Florent Le Coz
2015-02-27 12:26:48 +01:00
parent 1028d4d549
commit d600a2843f
51 changed files with 714 additions and 4917 deletions
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src/network/dns_handler.cpp
-112
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@@ -1,112 +0,0 @@
#include <config.h>
#ifdef CARES_FOUND
#include <network/dns_socket_handler.hpp>
#include <network/tcp_socket_handler.hpp>
#include <network/dns_handler.hpp>
#include <network/poller.hpp>
#include <algorithm>
#include <stdexcept>
DNSHandler DNSHandler::instance;
using namespace std::string_literals;
void on_hostname4_resolved(void* arg, int status, int, struct hostent* hostent)
{
TCPSocketHandler* socket_handler = static_cast<TCPSocketHandler*>(arg);
socket_handler->on_hostname4_resolved(status, hostent);
}
void on_hostname6_resolved(void* arg, int status, int, struct hostent* hostent)
{
TCPSocketHandler* socket_handler = static_cast<TCPSocketHandler*>(arg);
socket_handler->on_hostname6_resolved(status, hostent);
}
DNSHandler::DNSHandler()
{
int ares_error;
if ((ares_error = ::ares_library_init(ARES_LIB_INIT_ALL)) != 0)
throw std::runtime_error("Failed to initialize c-ares lib: "s + ares_strerror(ares_error));
if ((ares_error = ::ares_init(&this->channel)) != ARES_SUCCESS)
throw std::runtime_error("Failed to initialize c-ares channel: "s + ares_strerror(ares_error));
}
ares_channel& DNSHandler::get_channel()
{
return this->channel;
}
void DNSHandler::destroy()
{
this->socket_handlers.clear();
::ares_destroy(this->channel);
::ares_library_cleanup();
}
void DNSHandler::gethostbyname(const std::string& name,
TCPSocketHandler* socket_handler, int family)
{
socket_handler->free_cares_addrinfo();
if (family == AF_INET)
::ares_gethostbyname(this->channel, name.data(), family,
&::on_hostname4_resolved, socket_handler);
else
::ares_gethostbyname(this->channel, name.data(), family,
&::on_hostname6_resolved, socket_handler);
}
void DNSHandler::watch_dns_sockets(std::shared_ptr<Poller>& poller)
{
fd_set readers;
fd_set writers;
FD_ZERO(&readers);
FD_ZERO(&writers);
int ndfs = ::ares_fds(this->channel, &readers, &writers);
// For each existing DNS socket, see if we are still supposed to watch it,
// if not then erase it
this->socket_handlers.erase(
std::remove_if(this->socket_handlers.begin(), this->socket_handlers.end(),
[&readers](const auto& dns_socket)
{
return !FD_ISSET(dns_socket->get_socket(), &readers);
}),
this->socket_handlers.end());
for (auto i = 0; i < ndfs; ++i)
{
bool read = FD_ISSET(i, &readers);
bool write = FD_ISSET(i, &writers);
// Look for the DNSSocketHandler with this fd
auto it = std::find_if(this->socket_handlers.begin(),
this->socket_handlers.end(),
[i](const auto& socket_handler)
{
return i == socket_handler->get_socket();
});
if (!read && !write) // No need to read or write to it
{ // If found, erase it and stop watching it because it is not
// needed anymore
if (it != this->socket_handlers.end())
// The socket destructor removes it from the poller
this->socket_handlers.erase(it);
}
else // We need to write and/or read to it
{ // If not found, create it because we need to watch it
if (it == this->socket_handlers.end())
{
this->socket_handlers.emplace_front(std::make_unique<DNSSocketHandler>(poller, i));
it = this->socket_handlers.begin();
}
poller->add_socket_handler(it->get());
if (write)
poller->watch_send_events(it->get());
}
}
}
#endif /* CARES_FOUND */
src/network/dns_handler.hpp
-62
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#ifndef DNS_HANDLER_HPP_INCLUDED
#define DNS_HANDLER_HPP_INCLUDED
#include <config.h>
#ifdef CARES_FOUND
class TCPSocketHandler;
class Poller;
class DNSSocketHandler;
# include <ares.h>
# include <memory>
# include <string>
# include <list>
void on_hostname4_resolved(void* arg, int status, int, struct hostent* hostent);
void on_hostname6_resolved(void* arg, int status, int, struct hostent* hostent);
/**
* Class managing DNS resolution. It should only be statically instanciated
* once in SocketHandler. It manages ares channel and calls various
* functions of that library.
*/
class DNSHandler
{
public:
DNSHandler();
~DNSHandler() = default;
void gethostbyname(const std::string& name, TCPSocketHandler* socket_handler,
int family);
/**
* Call ares_fds to know what fd needs to be watched by the poller, create
* or destroy DNSSocketHandlers depending on the result.
*/
void watch_dns_sockets(std::shared_ptr<Poller>& poller);
/**
* Destroy and stop watching all the DNS sockets. Then de-init the channel
* and library.
*/
void destroy();
ares_channel& get_channel();
static DNSHandler instance;
private:
/**
* The list of sockets that needs to be watched, according to the last
* call to ares_fds. DNSSocketHandlers are added to it or removed from it
* in the watch_dns_sockets() method
*/
std::list<std::unique_ptr<DNSSocketHandler>> socket_handlers;
ares_channel channel;
DNSHandler(const DNSHandler&) = delete;
DNSHandler(DNSHandler&&) = delete;
DNSHandler& operator=(const DNSHandler&) = delete;
DNSHandler& operator=(DNSHandler&&) = delete;
};
#endif /* CARES_FOUND */
#endif /* DNS_HANDLER_HPP_INCLUDED */
src/network/dns_socket_handler.cpp
-45
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@@ -1,45 +0,0 @@
#include <config.h>
#ifdef CARES_FOUND
#include <network/dns_socket_handler.hpp>
#include <network/dns_handler.hpp>
#include <network/poller.hpp>
#include <ares.h>
DNSSocketHandler::DNSSocketHandler(std::shared_ptr<Poller> poller,
const socket_t socket):
SocketHandler(poller, socket)
{
}
DNSSocketHandler::~DNSSocketHandler()
{
}
void DNSSocketHandler::connect()
{
}
void DNSSocketHandler::on_recv()
{
// always stop watching send and read events. We will re-watch them if the
// next call to ares_fds tell us to
this->poller->remove_socket_handler(this->socket);
::ares_process_fd(DNSHandler::instance.get_channel(), this->socket, ARES_SOCKET_BAD);
}
void DNSSocketHandler::on_send()
{
// always stop watching send and read events. We will re-watch them if the
// next call to ares_fds tell us to
this->poller->remove_socket_handler(this->socket);
::ares_process_fd(DNSHandler::instance.get_channel(), ARES_SOCKET_BAD, this->socket);
}
bool DNSSocketHandler::is_connected() const
{
return true;
}
#endif /* CARES_FOUND */
src/network/dns_socket_handler.hpp
-46
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@@ -1,46 +0,0 @@
#ifndef DNS_SOCKET_HANDLER_HPP
# define DNS_SOCKET_HANDLER_HPP
#include <config.h>
#ifdef CARES_FOUND
#include <network/socket_handler.hpp>
#include <ares.h>
/**
* Manage a socket returned by ares_fds. We do not create, open or close the
* socket ourself: this is done by c-ares. We just call ares_process_fd()
* with the correct parameters, depending on what can be done on that socket
* (Poller reported it to be writable or readeable)
*/
class DNSSocketHandler: public SocketHandler
{
public:
explicit DNSSocketHandler(std::shared_ptr<Poller> poller, const socket_t socket);
~DNSSocketHandler();
/**
* Just call dns_process_fd, c-ares will do its work of send()ing or
* recv()ing the data it wants on that socket.
*/
void on_recv() override final;
void on_send() override final;
/**
* Do nothing, because we are always considered to be connected, since the
* connection is done by c-ares and not by us.
*/
void connect() override final;
/**
* Always true, see the comment for connect()
*/
bool is_connected() const override final;
private:
DNSSocketHandler(const DNSSocketHandler&) = delete;
DNSSocketHandler(DNSSocketHandler&&) = delete;
DNSSocketHandler& operator=(const DNSSocketHandler&) = delete;
DNSSocketHandler& operator=(DNSSocketHandler&&) = delete;
};
#endif // CARES_FOUND
#endif // DNS_SOCKET_HANDLER_HPP
src/network/poller.cpp
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#include <network/poller.hpp>
#include <logger/logger.hpp>
#include <utils/timed_events.hpp>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <cstring>
#include <iostream>
#include <stdexcept>
Poller::Poller()
{
#if POLLER == POLL
this->nfds = 0;
#elif POLLER == EPOLL
this->epfd = ::epoll_create1(0);
if (this->epfd == -1)
{
log_error("epoll failed: " << strerror(errno));
throw std::runtime_error("Could not create epoll instance");
}
#endif
}
Poller::~Poller()
{
}
void Poller::add_socket_handler(SocketHandler* socket_handler)
{
// Don't do anything if the socket is already managed
const auto it = this->socket_handlers.find(socket_handler->get_socket());
if (it != this->socket_handlers.end())
return ;
this->socket_handlers.emplace(socket_handler->get_socket(), socket_handler);
// We always watch all sockets for receive events
#if POLLER == POLL
this->fds[this->nfds].fd = socket_handler->get_socket();
this->fds[this->nfds].events = POLLIN;
this->nfds++;
#endif
#if POLLER == EPOLL
struct epoll_event event = {EPOLLIN, {socket_handler}};
const int res = ::epoll_ctl(this->epfd, EPOLL_CTL_ADD, socket_handler->get_socket(), &event);
if (res == -1)
{
log_error("epoll_ctl failed: " << strerror(errno));
throw std::runtime_error("Could not add socket to epoll");
}
#endif
}
void Poller::remove_socket_handler(const socket_t socket)
{
const auto it = this->socket_handlers.find(socket);
if (it == this->socket_handlers.end())
throw std::runtime_error("Trying to remove a SocketHandler that is not managed");
this->socket_handlers.erase(it);
#if POLLER == POLL
for (size_t i = 0; i < this->nfds; i++)
{
if (this->fds[i].fd == socket)
{
// Move all subsequent pollfd by one on the left, erasing the
// value of the one we remove
for (size_t j = i; j < this->nfds - 1; ++j)
{
this->fds[j].fd = this->fds[j+1].fd;
this->fds[j].events= this->fds[j+1].events;
}
this->nfds--;
}
}
#elif POLLER == EPOLL
const int res = ::epoll_ctl(this->epfd, EPOLL_CTL_DEL, socket, nullptr);
if (res == -1)
{
log_error("epoll_ctl failed: " << strerror(errno));
throw std::runtime_error("Could not remove socket from epoll");
}
#endif
}
void Poller::watch_send_events(SocketHandler* socket_handler)
{
#if POLLER == POLL
for (size_t i = 0; i <= this->nfds; ++i)
{
if (this->fds[i].fd == socket_handler->get_socket())
{
this->fds[i].events = POLLIN|POLLOUT;
return;
}
}
throw std::runtime_error("Cannot watch a non-registered socket for send events");
#elif POLLER == EPOLL
struct epoll_event event = {EPOLLIN|EPOLLOUT, {socket_handler}};
const int res = ::epoll_ctl(this->epfd, EPOLL_CTL_MOD, socket_handler->get_socket(), &event);
if (res == -1)
{
log_error("epoll_ctl failed: " << strerror(errno));
throw std::runtime_error("Could not modify socket flags in epoll");
}
#endif
}
void Poller::stop_watching_send_events(SocketHandler* socket_handler)
{
#if POLLER == POLL
for (size_t i = 0; i <= this->nfds; ++i)
{
if (this->fds[i].fd == socket_handler->get_socket())
{
this->fds[i].events = POLLIN;
return;
}
}
throw std::runtime_error("Cannot watch a non-registered socket for send events");
#elif POLLER == EPOLL
struct epoll_event event = {EPOLLIN, {socket_handler}};
const int res = ::epoll_ctl(this->epfd, EPOLL_CTL_MOD, socket_handler->get_socket(), &event);
if (res == -1)
{
log_error("epoll_ctl failed: " << strerror(errno));
throw std::runtime_error("Could not modify socket flags in epoll");
}
#endif
}
int Poller::poll(const std::chrono::milliseconds& timeout)
{
if (this->socket_handlers.empty() && timeout == utils::no_timeout)
return -1;
#if POLLER == POLL
int nb_events = ::poll(this->fds, this->nfds, timeout.count());
if (nb_events < 0)
{
if (errno == EINTR)
return true;
log_error("poll failed: " << strerror(errno));
throw std::runtime_error("Poll failed");
}
// We cannot possibly have more ready events than the number of fds we are
// watching
assert(static_cast<unsigned int>(nb_events) <= this->nfds);
for (size_t i = 0; i <= this->nfds && nb_events != 0; ++i)
{
if (this->fds[i].revents == 0)
continue;
else if (this->fds[i].revents & POLLIN)
{
auto socket_handler = this->socket_handlers.at(this->fds[i].fd);
socket_handler->on_recv();
nb_events--;
}
else if (this->fds[i].revents & POLLOUT)
{
auto socket_handler = this->socket_handlers.at(this->fds[i].fd);
if (socket_handler->is_connected())
socket_handler->on_send();
else
socket_handler->connect();
nb_events--;
}
}
return 1;
#elif POLLER == EPOLL
static const size_t max_events = 12;
struct epoll_event revents[max_events];
const int nb_events = ::epoll_wait(this->epfd, revents, max_events, timeout.count());
if (nb_events == -1)
{
if (errno == EINTR)
return 0;
log_error("epoll wait: " << strerror(errno));
throw std::runtime_error("Epoll_wait failed");
}
for (int i = 0; i < nb_events; ++i)
{
auto socket_handler = static_cast<SocketHandler*>(revents[i].data.ptr);
if (revents[i].events & EPOLLIN)
socket_handler->on_recv();
else if (revents[i].events & EPOLLOUT)
{
if (socket_handler->is_connected())
socket_handler->on_send();
else
socket_handler->connect();
}
}
return nb_events;
#endif
}
size_t Poller::size() const
{
return this->socket_handlers.size();
}
src/network/poller.hpp
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#ifndef POLLER_INCLUDED
# define POLLER_INCLUDED
#include <network/socket_handler.hpp>
#include <unordered_map>
#include <memory>
#include <chrono>
#define POLL 1
#define EPOLL 2
#define KQUEUE 3
#include <config.h>
#ifndef POLLER
#define POLLER POLL
#endif
#if POLLER == POLL
#include <poll.h>
#define MAX_POLL_FD_NUMBER 4096
#elif POLLER == EPOLL
#include <sys/epoll.h>
#else
#error Invalid POLLER value
#endif
/**
* We pass some SocketHandlers to this Poller, which uses
* poll/epoll/kqueue/select etc to wait for events on these SocketHandlers,
* and call the callbacks when event occurs.
*
* TODO: support these pollers:
* - kqueue(2)
*/
class Poller
{
public:
explicit Poller();
~Poller();
/**
* Add a SocketHandler to be monitored by this Poller. All receive events
* are always automatically watched.
*/
void add_socket_handler(SocketHandler* socket_handler);
/**
* Remove (and stop managing) a SocketHandler, designated by the given socket_t.
*/
void remove_socket_handler(const socket_t socket);
/**
* Signal the poller that he needs to watch for send events for the given
* SocketHandler.
*/
void watch_send_events(SocketHandler* socket_handler);
/**
* Signal the poller that he needs to stop watching for send events for
* this SocketHandler.
*/
void stop_watching_send_events(SocketHandler* socket_handler);
/**
* Wait for all watched events, and call the SocketHandlers' callbacks
* when one is ready. Returns if nothing happened before the provided
* timeout. If the timeout is 0, it waits forever. If there is no
* watched event, returns -1 immediately, ignoring the timeout value.
* Otherwise, returns the number of event handled. If 0 is returned this
* means that we were interrupted by a signal, or the timeout occured.
*/
int poll(const std::chrono::milliseconds& timeout);
/**
* Returns the number of SocketHandlers managed by the poller.
*/
size_t size() const;
private:
/**
* A "list" of all the SocketHandlers that we manage, indexed by socket,
* because that's what is returned by select/poll/etc when an event
* occures.
*/
std::unordered_map<socket_t, SocketHandler*> socket_handlers;
#if POLLER == POLL
struct pollfd fds[MAX_POLL_FD_NUMBER];
nfds_t nfds;
#elif POLLER == EPOLL
int epfd;
#endif
Poller(const Poller&) = delete;
Poller(Poller&&) = delete;
Poller& operator=(const Poller&) = delete;
Poller& operator=(Poller&&) = delete;
};
#endif // POLLER_INCLUDED
src/network/socket_handler.hpp
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#ifndef SOCKET_HANDLER_HPP
# define SOCKET_HANDLER_HPP
#include <config.h>
#include <memory>
class Poller;
typedef int socket_t;
class SocketHandler
{
public:
explicit SocketHandler(std::shared_ptr<Poller> poller, const socket_t socket):
poller(poller),
socket(socket)
{}
virtual ~SocketHandler() {}
virtual void on_recv() = 0;
virtual void on_send() = 0;
virtual void connect() = 0;
virtual bool is_connected() const = 0;
socket_t get_socket() const
{ return this->socket; }
protected:
/**
* A pointer to the poller that manages us, because we need to communicate
* with it.
*/
std::shared_ptr<Poller> poller;
/**
* The handled socket.
*/
socket_t socket;
private:
SocketHandler(const SocketHandler&) = delete;
SocketHandler(SocketHandler&&) = delete;
SocketHandler& operator=(const SocketHandler&) = delete;
SocketHandler& operator=(SocketHandler&&) = delete;
};
#endif // SOCKET_HANDLER_HPP
src/network/tcp_socket_handler.cpp
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@@ -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
src/network/tcp_socket_handler.hpp
-297
View File
@@ -1,297 +0,0 @@
#ifndef SOCKET_HANDLER_INCLUDED
# define SOCKET_HANDLER_INCLUDED
#include <network/socket_handler.hpp>
#include <logger/logger.hpp>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <utility>
#include <memory>
#include <string>
#include <list>
#include "config.h"
#ifdef CARES_FOUND
# include <ares.h>
#endif
#ifdef BOTAN_FOUND
# include <botan/botan.h>
# include <botan/tls_client.h>
/**
* A very simple credential manager that accepts any certificate.
*/
class Permissive_Credentials_Manager: public Botan::Credentials_Manager
{
public:
void verify_certificate_chain(const std::string& type, const std::string& purported_hostname, const std::vector<Botan::X509_Certificate>&)
{ // TODO: Offer the admin to disallow connection on untrusted
// certificates
log_debug("Checking remote certificate (" << type << ") for hostname " << purported_hostname);
}
};
#endif // BOTAN_FOUND
/**
* An interface, with a series of callbacks that should be implemented in
* subclasses that deal with a socket. These callbacks are called on various events
* (read/write/timeout, etc) when they are notified to a poller
* (select/poll/epoll etc)
*/
class TCPSocketHandler: public SocketHandler
{
protected:
~TCPSocketHandler();
public:
explicit TCPSocketHandler(std::shared_ptr<Poller> poller);
/**
* Connect to the remote server, and call on_connected() if this
* succeeds. If tls is true, we set use_tls to true and will also call
* start_tls() when the connection succeeds.
*/
void connect(const std::string& address, const std::string& port, const bool tls);
void connect() override final;
/**
* Reads raw data from the socket. And pass it to parse_in_buffer()
* If we are using TLS on this connection, we call tls_recv()
*/
void on_recv() override final;
/**
* Write as much data from out_buf as possible, in the socket.
*/
void on_send() override final;
/**
* Add the given data to out_buf and tell our poller that we want to be
* notified when a send event is ready.
*
* This can be overriden if we want to modify the data before sending
* it. For example if we want to encrypt it.
*/
void send_data(std::string&& data);
/**
* Watch the socket for send events, if our out buffer is not empty.
*/
void send_pending_data();
/**
* Close the connection, remove us from the poller
*/
void close();
/**
* Called by a TimedEvent, when the connection did not succeed or fail
* after a given time.
*/
void on_connection_timeout();
/**
* Called when the connection is successful.
*/
virtual void on_connected() = 0;
/**
* Called when the connection fails. Not when it is closed later, just at
* the connect() call.
*/
virtual void on_connection_failed(const std::string& reason) = 0;
/**
* Called when we detect a disconnection from the remote host.
*/
virtual void on_connection_close(const std::string& error) = 0;
/**
* Handle/consume (some of) the data received so far. The data to handle
* may be in the in_buf buffer, or somewhere else, depending on what
* get_receive_buffer() returned. If some data is used from in_buf, it
* should be truncated, only the unused data should be left untouched.
*
* The size argument is the size of the last chunk of data that was added to the buffer.
*/
virtual void parse_in_buffer(const size_t size) = 0;
bool is_connected() const override final;
bool is_connecting() const;
#ifdef CARES_FOUND
void on_hostname4_resolved(int status, struct hostent* hostent);
void on_hostname6_resolved(int status, struct hostent* hostent);
void free_cares_addrinfo();
void fill_ares_addrinfo4(const struct hostent* hostent);
void fill_ares_addrinfo6(const struct hostent* hostent);
#endif
private:
/**
* Initialize the socket with the parameters contained in the given
* addrinfo structure.
*/
void init_socket(const struct addrinfo* rp);
/**
* Reads from the socket into the provided buffer. If an error occurs
* (read returns <= 0), the handling of the error is done here (close the
* connection, log a message, etc).
*
* Returns the value returned by ::recv(), so the buffer should not be
* used if it’s not positive.
*/
ssize_t do_recv(void* recv_buf, const size_t buf_size);
/**
* Reads data from the socket and calls parse_in_buffer with it.
*/
void plain_recv();
/**
* Mark the given data as ready to be sent, as-is, on the socket, as soon
* as we can.
*/
void raw_send(std::string&& data);
#ifdef BOTAN_FOUND
/**
* Create the TLS::Client object, with all the callbacks etc. This must be
* called only when we know we are able to send TLS-encrypted data over
* the socket.
*/
void start_tls();
/**
* An additional step to pass the data into our tls object to decrypt it
* before passing it to parse_in_buffer.
*/
void tls_recv();
/**
* Pass the data to the tls object in order to encrypt it. The tls object
* will then call raw_send as a callback whenever data as been encrypted
* and can be sent on the socket.
*/
void tls_send(std::string&& data);
/**
* Called by the tls object that some data has been decrypt. We call
* parse_in_buffer() to handle that unencrypted data.
*/
void tls_data_cb(const Botan::byte* data, size_t size);
/**
* Called by the tls object to indicate that some data has been encrypted
* and is now ready to be sent on the socket as is.
*/
void tls_output_fn(const Botan::byte* data, size_t size);
/**
* Called by the tls object to indicate that a TLS alert has been
* received. We don’t use it, we just log some message, at the moment.
*/
void tls_alert_cb(Botan::TLS::Alert alert, const Botan::byte*, size_t);
/**
* Called by the tls object at the end of the TLS handshake. We don't do
* anything here appart from logging the TLS session information.
*/
bool tls_handshake_cb(const Botan::TLS::Session& session);
/**
* Called whenever the tls session goes from inactive to active. This
* means that the handshake has just been successfully done, and we can
* now proceed to send any available data into our tls object.
*/
void on_tls_activated();
#endif // BOTAN_FOUND
/**
* Where data is added, when we want to send something to the client.
*/
std::list<std::string> out_buf;
/**
* Keep the details of the addrinfo that triggered a EINPROGRESS error when
* connect()ing to it, to reuse it directly when connect() is called
* again.
*/
struct addrinfo addrinfo;
struct sockaddr_in6 ai_addr;
socklen_t ai_addrlen;
protected:
/**
* Where data read from the socket is added until we can extract a full
* and meaningful “message” from it.
*
* TODO: something more efficient than a string.
*/
std::string in_buf;
/**
* Whether we are using TLS on this connection or not.
*/
bool use_tls;
/**
* Provide a buffer in which data can be directly received. This can be
* used to avoid copying data into in_buf before using it. If no buffer
* needs to be provided, nullptr is returned (the default implementation
* does that), in that case our internal in_buf will be used to save the
* data until it can be used by parse_in_buffer().
*/
virtual void* get_receive_buffer(const size_t size) const;
/**
* Hostname we are connected/connecting to
*/
std::string address;
/**
* Port we are connected/connecting to
*/
std::string port;
bool connected;
bool connecting;
#ifdef CARES_FOUND
/**
* Whether or not the DNS resolution was successfully done
*/
bool resolved;
bool resolved4;
bool resolved6;
/**
* When using c-ares to resolve the host asynchronously, we need the
* c-ares callback to fill a structure (a struct addrinfo, for
* compatibility with getaddrinfo and the rest of the code that works when
* c-ares is not used) with all returned values (for example an IPv6 and
* an IPv4). The next call of connect() will then try all these values
* (exactly like we do with the result of getaddrinfo) and save the one
* that worked (or returned EINPROGRESS) in the other struct addrinfo (see
* the members addrinfo, ai_addrlen, and ai_addr).
*/
struct addrinfo* cares_addrinfo;
std::string cares_error;
#endif // CARES_FOUND
private:
TCPSocketHandler(const TCPSocketHandler&) = delete;
TCPSocketHandler(TCPSocketHandler&&) = delete;
TCPSocketHandler& operator=(const TCPSocketHandler&) = delete;
TCPSocketHandler& operator=(TCPSocketHandler&&) = delete;
#ifdef BOTAN_FOUND
/**
* Botan stuff to manipulate a TLS session.
*/
static Botan::AutoSeeded_RNG rng;
static Permissive_Credentials_Manager credential_manager;
static Botan::TLS::Policy policy;
static Botan::TLS::Session_Manager_In_Memory session_manager;
/**
* We use a unique_ptr because we may not want to create the object at
* all. The Botan::TLS::Client object generates a handshake message as
* soon and calls the output_fn callback with it as soon as it is
* created. Therefore, we do not want to create it if do not intend to do
* send any TLS-encrypted message. We create the object only when needed
* (for example after we have negociated a TLS session using a STARTTLS
* message, or stuf like that).
*
* See start_tls for the method where this object is created.
*/
std::unique_ptr<Botan::TLS::Client> tls;
/**
* An additional buffer to keep data that the user wants to send, but
* cannot because the handshake is not done.
*/
std::string pre_buf;
#endif // BOTAN_FOUND
};
#endif // SOCKET_HANDLER_INCLUDED