diff options
Diffstat (limited to 'src/network')
| -rw-r--r-- | src/network/dns_handler.cpp | 112 | ||||
| -rw-r--r-- | src/network/dns_handler.hpp | 62 | ||||
| -rw-r--r-- | src/network/dns_socket_handler.cpp | 45 | ||||
| -rw-r--r-- | src/network/dns_socket_handler.hpp | 46 | ||||
| -rw-r--r-- | src/network/poller.cpp | 203 | ||||
| -rw-r--r-- | src/network/poller.hpp | 95 | ||||
| -rw-r--r-- | src/network/socket_handler.hpp | 45 | ||||
| -rw-r--r-- | src/network/tcp_socket_handler.cpp | 572 | ||||
| -rw-r--r-- | src/network/tcp_socket_handler.hpp | 297 |
9 files changed, 0 insertions, 1477 deletions
diff --git a/src/network/dns_handler.cpp b/src/network/dns_handler.cpp deleted file mode 100644 index 45bf626..0000000 --- a/src/network/dns_handler.cpp +++ /dev/null @@ -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 */ diff --git a/src/network/dns_handler.hpp b/src/network/dns_handler.hpp deleted file mode 100644 index ec5b2fa..0000000 --- a/src/network/dns_handler.hpp +++ /dev/null @@ -1,62 +0,0 @@ -#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 */ diff --git a/src/network/dns_socket_handler.cpp b/src/network/dns_socket_handler.cpp deleted file mode 100644 index 6563894..0000000 --- a/src/network/dns_socket_handler.cpp +++ /dev/null @@ -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 */ diff --git a/src/network/dns_socket_handler.hpp b/src/network/dns_socket_handler.hpp deleted file mode 100644 index beb47d9..0000000 --- a/src/network/dns_socket_handler.hpp +++ /dev/null @@ -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 diff --git a/src/network/poller.cpp b/src/network/poller.cpp deleted file mode 100644 index ffc4f2d..0000000 --- a/src/network/poller.cpp +++ /dev/null @@ -1,203 +0,0 @@ -#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(); -} diff --git a/src/network/poller.hpp b/src/network/poller.hpp deleted file mode 100644 index c674e4c..0000000 --- a/src/network/poller.hpp +++ /dev/null @@ -1,95 +0,0 @@ -#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 diff --git a/src/network/socket_handler.hpp b/src/network/socket_handler.hpp deleted file mode 100644 index 0858474..0000000 --- a/src/network/socket_handler.hpp +++ /dev/null @@ -1,45 +0,0 @@ -#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 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 diff --git a/src/network/tcp_socket_handler.hpp b/src/network/tcp_socket_handler.hpp deleted file mode 100644 index 7f10cff..0000000 --- a/src/network/tcp_socket_handler.hpp +++ /dev/null @@ -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 |