mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-11-13 01:10:24 +00:00
356 lines
8.3 KiB
C++
356 lines
8.3 KiB
C++
#include <ev/ev.h>
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#include <util/logic.hpp>
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#include <util/mem.hpp>
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#include <util/string_view.hpp>
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#include <stddef.h>
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// apparently current Solaris will emulate epoll.
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#if __linux__ || __sun__
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#include <ev/ev_epoll.hpp>
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#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
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|| (__APPLE__ && __MACH__)
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#include <ev/ev_kqueue.hpp>
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#elif defined(_WIN32) || defined(_WIN64) || defined(__NT__)
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#include <ev/ev_win32.hpp>
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#else
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#error No async event loop for your platform, subclass llarp_ev_loop
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#endif
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void
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llarp_ev_loop_alloc(struct llarp_ev_loop **ev)
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{
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#if __linux__ || __sun__
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*ev = new llarp_epoll_loop;
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#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
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|| (__APPLE__ && __MACH__)
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*ev = new llarp_kqueue_loop;
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#elif defined(_WIN32) || defined(_WIN64) || defined(__NT__)
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*ev = new llarp_win32_loop;
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#else
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// TODO: fall back to a generic select-based event loop
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#error no event loop subclass
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#endif
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(*ev)->init();
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(*ev)->_now = llarp::time_now_ms();
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}
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void
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llarp_ev_loop_free(struct llarp_ev_loop **ev)
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{
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delete *ev;
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*ev = nullptr;
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#ifdef _WIN32
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exit_tun_loop();
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#endif
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}
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int
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llarp_ev_loop_run(struct llarp_ev_loop *ev, llarp::Logic *logic)
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{
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while(ev->running())
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{
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ev->_now = llarp::time_now_ms();
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ev->tick(EV_TICK_INTERVAL);
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if(ev->running())
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logic->tick(ev->_now);
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}
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return 0;
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}
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int
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llarp_fd_promise_wait_for_value(struct llarp_fd_promise *p)
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{
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return p->Get();
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}
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void
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llarp_ev_loop_run_single_process(struct llarp_ev_loop *ev,
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struct llarp_threadpool *tp,
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llarp::Logic *logic)
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{
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while(ev->running())
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{
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ev->_now = llarp::time_now_ms();
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ev->tick(EV_TICK_INTERVAL);
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if(ev->running())
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{
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ev->_now = llarp::time_now_ms();
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logic->tick_async(ev->_now);
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llarp_threadpool_tick(tp);
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}
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}
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}
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int
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llarp_ev_add_udp(struct llarp_ev_loop *ev, struct llarp_udp_io *udp,
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const struct sockaddr *src)
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{
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udp->parent = ev;
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if(ev->udp_listen(udp, src))
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return 0;
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return -1;
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}
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int
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llarp_ev_close_udp(struct llarp_udp_io *udp)
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{
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if(udp->parent->udp_close(udp))
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return 0;
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return -1;
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}
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llarp_time_t
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llarp_ev_loop_time_now_ms(struct llarp_ev_loop *loop)
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{
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if(loop)
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return loop->_now;
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return llarp::time_now_ms();
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}
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void
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llarp_ev_loop_stop(struct llarp_ev_loop *loop)
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{
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loop->stop();
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}
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int
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llarp_ev_udp_sendto(struct llarp_udp_io *udp, const sockaddr *to,
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const llarp_buffer_t &buf)
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{
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auto ret =
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static_cast< llarp::ev_io * >(udp->impl)->sendto(to, buf.base, buf.sz);
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#ifndef _WIN32
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if(ret == -1 && errno != 0)
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{
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#else
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if(ret == -1 && WSAGetLastError())
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{
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#endif
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#ifndef _WIN32
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llarp::LogWarn("sendto failed ", strerror(errno));
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errno = 0;
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}
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#else
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char ebuf[1024];
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int err = WSAGetLastError();
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FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, err, LANG_NEUTRAL, ebuf,
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1024, nullptr);
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llarp::LogWarn("sendto failed: ", ebuf);
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WSASetLastError(0);
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}
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#endif
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return ret;
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}
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#ifndef _WIN32
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#include <string.h>
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bool
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llarp_ev_add_tun(struct llarp_ev_loop *loop, struct llarp_tun_io *tun)
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{
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// llarp::LogInfo("ev creating tunnel ", tun->ifaddr, " on ", tun->ifname);
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if(strcmp(tun->ifaddr, "") == 0 || strcmp(tun->ifaddr, "auto") == 0)
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{
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std::string ifaddr = llarp::findFreePrivateRange();
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auto pos = ifaddr.find("/");
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if(pos == std::string::npos)
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{
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llarp::LogWarn("Auto ifaddr didn't return a netmask: ", ifaddr);
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return false;
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}
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int num;
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std::string part = ifaddr.substr(pos + 1);
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#if defined(ANDROID) || defined(RPI)
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num = atoi(part.c_str());
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#else
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num = std::stoi(part);
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#endif
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if(num <= 0)
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{
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llarp::LogError("bad ifaddr netmask value: ", ifaddr);
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return false;
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}
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tun->netmask = num;
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const std::string addr = ifaddr.substr(0, pos);
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std::copy_n(addr.begin(), std::min(sizeof(tun->ifaddr), addr.size()),
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tun->ifaddr);
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llarp::LogInfo("IfAddr autodetect: ", tun->ifaddr, "/", tun->netmask);
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}
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if(strcmp(tun->ifname, "") == 0 || strcmp(tun->ifname, "auto") == 0)
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{
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std::string ifname = llarp::findFreeLokiTunIfName();
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std::copy_n(ifname.begin(), std::min(sizeof(tun->ifname), ifname.size()),
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tun->ifname);
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llarp::LogInfo("IfName autodetect: ", tun->ifname);
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}
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llarp::LogDebug("Tun Interface will use the following settings:");
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llarp::LogDebug("IfAddr: ", tun->ifaddr);
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llarp::LogDebug("IfName: ", tun->ifname);
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llarp::LogDebug("IfNMsk: ", tun->netmask);
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auto dev = loop->create_tun(tun);
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tun->impl = dev;
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if(dev)
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{
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return loop->add_ev(dev, false);
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}
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llarp::LogWarn("Loop could not create tun");
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return false;
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}
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#else
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// OK, now it's time to do it my way.
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// we're not even going to use the existing llarp::tun
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// we still use the llarp_tun_io struct
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// since we still need to branch to the
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// packet processing functions
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bool
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llarp_ev_add_tun(llarp_ev_loop *loop, llarp_tun_io *tun)
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{
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UNREFERENCED_PARAMETER(loop);
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auto dev = new win32_tun_io(tun);
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tun->impl = dev;
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// We're not even going to add this to the socket event loop
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if(dev)
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{
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dev->setup();
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return dev->add_ev(); // start up tun and add to event queue
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}
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return false;
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}
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#endif
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#ifndef _WIN32
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bool
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llarp_ev_tun_async_write(struct llarp_tun_io *tun, const llarp_buffer_t &buf)
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{
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if(buf.sz > EV_WRITE_BUF_SZ)
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{
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llarp::LogWarn("packet too big, ", buf.sz, " > ", EV_WRITE_BUF_SZ);
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return false;
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}
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return static_cast< llarp::tun * >(tun->impl)->queue_write(buf.base, buf.sz);
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}
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#else
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bool
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llarp_ev_tun_async_write(struct llarp_tun_io *tun, const llarp_buffer_t &buf)
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{
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if(buf.sz > EV_WRITE_BUF_SZ)
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{
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llarp::LogWarn("packet too big, ", buf.sz, " > ", EV_WRITE_BUF_SZ);
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return false;
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}
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return static_cast< win32_tun_io * >(tun->impl)->queue_write(buf.base,
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buf.sz);
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}
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#endif
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bool
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llarp_tcp_conn_async_write(struct llarp_tcp_conn *conn, const llarp_buffer_t &b)
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{
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ManagedBuffer buf{b};
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llarp::tcp_conn *impl = static_cast< llarp::tcp_conn * >(conn->impl);
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if(impl->_shouldClose)
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{
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llarp::LogError("write on closed connection");
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return false;
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}
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size_t sz = buf.underlying.sz;
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buf.underlying.cur = buf.underlying.base;
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while(sz > EV_WRITE_BUF_SZ)
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{
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if(!impl->queue_write(buf.underlying.cur, EV_WRITE_BUF_SZ))
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{
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return false;
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}
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buf.underlying.cur += EV_WRITE_BUF_SZ;
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sz -= EV_WRITE_BUF_SZ;
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}
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return impl->queue_write(buf.underlying.cur, sz);
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}
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void
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llarp_tcp_async_try_connect(struct llarp_ev_loop *loop,
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struct llarp_tcp_connecter *tcp)
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{
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tcp->loop = loop;
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llarp::string_view addr_str, port_str;
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// try parsing address
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const char *begin = tcp->remote;
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const char *ptr = strstr(tcp->remote, ":");
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// get end of address
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if(ptr == nullptr)
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{
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llarp::LogError("bad address: ", tcp->remote);
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if(tcp->error)
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tcp->error(tcp);
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return;
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}
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const char *end = ptr;
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while(*end && ((end - begin) < static_cast< ptrdiff_t >(sizeof tcp->remote)))
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{
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++end;
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}
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addr_str = llarp::string_view(begin, ptr - begin);
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++ptr;
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port_str = llarp::string_view(ptr, end - ptr);
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// actually parse address
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llarp::Addr addr(addr_str, port_str);
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if(!loop->tcp_connect(tcp, addr))
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{
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llarp::LogError("async connect failed");
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if(tcp->error)
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tcp->error(tcp);
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}
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}
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bool
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llarp_tcp_serve(struct llarp_ev_loop *loop, struct llarp_tcp_acceptor *tcp,
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const struct sockaddr *bindaddr)
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{
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tcp->loop = loop;
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llarp::ev_io *impl = loop->bind_tcp(tcp, bindaddr);
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if(impl)
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{
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return loop->add_ev(impl, false);
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}
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return false;
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}
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void
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llarp_tcp_acceptor_close(struct llarp_tcp_acceptor *tcp)
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{
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llarp::ev_io *impl = static_cast< llarp::ev_io * >(tcp->user);
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tcp->impl = nullptr;
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tcp->loop->close_ev(impl);
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if(tcp->closed)
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tcp->closed(tcp);
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// dont free acceptor because it may be stack allocated
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}
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void
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llarp_tcp_conn_close(struct llarp_tcp_conn *conn)
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{
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static_cast< llarp::tcp_conn * >(conn->impl)->_shouldClose = true;
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}
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namespace llarp
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{
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bool
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tcp_conn::tick()
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{
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if(_shouldClose)
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{
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if(tcp.closed)
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tcp.closed(&tcp);
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return false;
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}
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else if(tcp.tick)
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tcp.tick(&tcp);
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return true;
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}
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} // namespace llarp
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