mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-11-17 15:25:35 +00:00
533 lines
10 KiB
C++
533 lines
10 KiB
C++
#include <ev/ev_epoll.hpp>
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#ifdef ANDROID
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/** TODO: correct this value */
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#define SOCK_NONBLOCK (0)
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#endif
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namespace llarp
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{
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inline int
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tcp_conn::read(byte_t* buf, size_t sz)
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{
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if(_shouldClose)
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return -1;
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ssize_t amount = ::read(fd, buf, sz);
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if(amount > 0)
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{
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if(tcp.read)
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tcp.read(&tcp, llarp_buffer_t(buf, amount));
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}
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else
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{
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// error
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_shouldClose = true;
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return -1;
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}
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return 0;
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}
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inline void
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tcp_conn::flush_write()
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{
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connected();
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ev_io::flush_write();
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}
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inline ssize_t
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tcp_conn::do_write(void* buf, size_t sz)
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{
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if(_shouldClose)
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return -1;
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// pretty much every UNIX system still extant, _including_ solaris
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// (on both sides of the fork) can ignore SIGPIPE....except
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// the other vendored systems... -rick
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return ::send(fd, buf, sz, MSG_NOSIGNAL); // ignore sigpipe
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}
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inline void
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tcp_conn::connect()
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{
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socklen_t slen = sizeof(sockaddr_in);
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if(_addr.ss_family == AF_UNIX)
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slen = sizeof(sockaddr_un);
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else if(_addr.ss_family == AF_INET6)
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slen = sizeof(sockaddr_in6);
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int result = ::connect(fd, (const sockaddr*)&_addr, slen);
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if(result == 0)
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{
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llarp::LogDebug("connected immedidately");
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connected();
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}
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else if(errno == EINPROGRESS)
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{
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// in progress
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llarp::LogDebug("connect in progress");
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errno = 0;
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return;
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}
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else if(_conn->error)
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{
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// wtf?
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llarp::LogError("error connecting ", strerror(errno));
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_conn->error(_conn);
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}
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}
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inline int
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tcp_serv::read(byte_t*, size_t)
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{
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int new_fd = ::accept(fd, nullptr, nullptr);
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if(new_fd == -1)
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{
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llarp::LogError("failed to accept on ", fd, ":", strerror(errno));
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return -1;
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}
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// build handler
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llarp::tcp_conn* connimpl = new tcp_conn(loop, new_fd);
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if(loop->add_ev(connimpl, true))
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{
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// call callback
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if(tcp->accepted)
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tcp->accepted(tcp, &connimpl->tcp);
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return 0;
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}
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// cleanup error
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delete connimpl;
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return -1;
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}
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bool
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udp_listener::tick()
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{
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if(udp->tick)
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udp->tick(udp);
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return true;
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}
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int
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udp_listener::read(byte_t* buf, size_t sz)
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{
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llarp_buffer_t b;
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b.base = buf;
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b.cur = b.base;
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sockaddr_in6 src;
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socklen_t slen = sizeof(sockaddr_in6);
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sockaddr* addr = (sockaddr*)&src;
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ssize_t ret = ::recvfrom(fd, b.base, sz, 0, addr, &slen);
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if(ret < 0)
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return -1;
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if(static_cast< size_t >(ret) > sz)
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return -1;
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b.sz = ret;
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udp->recvfrom(udp, addr, ManagedBuffer{b});
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return 0;
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}
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int
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udp_listener::sendto(const sockaddr* to, const void* data, size_t sz)
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{
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socklen_t slen;
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switch(to->sa_family)
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{
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case AF_INET:
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slen = sizeof(struct sockaddr_in);
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break;
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case AF_INET6:
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slen = sizeof(struct sockaddr_in6);
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break;
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default:
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return -1;
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}
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ssize_t sent = ::sendto(fd, data, sz, SOCK_NONBLOCK, to, slen);
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if(sent == -1)
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{
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llarp::LogWarn(strerror(errno));
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}
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return sent;
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}
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int
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tun::sendto(__attribute__((unused)) const sockaddr* to,
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__attribute__((unused)) const void* data,
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__attribute__((unused)) size_t sz)
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{
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return -1;
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}
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bool
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tun::tick()
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{
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if(t->tick)
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t->tick(t);
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flush_write();
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return true;
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}
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void
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tun::flush_write()
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{
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if(t->before_write)
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t->before_write(t);
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ev_io::flush_write();
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}
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int
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tun::read(byte_t* buf, size_t sz)
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{
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ssize_t ret = tuntap_read(tunif, buf, sz);
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if(ret > 0 && t->recvpkt)
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{
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// does not have pktinfo
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t->recvpkt(t, llarp_buffer_t(buf, ret));
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}
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return ret;
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}
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int
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tun::wait_for_fd_promise(struct device* dev)
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{
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llarp::tun* t = static_cast< llarp::tun* >(dev->user);
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if(t->t->get_fd_promise)
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{
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struct llarp_fd_promise* promise = t->t->get_fd_promise(t->t);
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if(promise)
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return llarp_fd_promise_wait_for_value(promise);
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}
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return -1;
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}
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bool
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tun::setup()
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{
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// for android
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if(t->get_fd_promise)
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{
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tunif->obtain_fd = &wait_for_fd_promise;
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tunif->user = this;
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}
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llarp::LogDebug("set ifname to ", t->ifname);
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strncpy(tunif->if_name, t->ifname, sizeof(tunif->if_name));
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if(tuntap_start(tunif, TUNTAP_MODE_TUNNEL, 0) == -1)
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{
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llarp::LogWarn("failed to start interface");
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return false;
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}
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if(t->get_fd_promise == nullptr)
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{
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if(tuntap_up(tunif) == -1)
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{
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llarp::LogWarn("failed to put interface up: ", strerror(errno));
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return false;
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}
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if(tuntap_set_ip(tunif, t->ifaddr, t->ifaddr, t->netmask) == -1)
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{
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llarp::LogWarn("failed to set ip");
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return false;
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}
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}
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fd = tunif->tun_fd;
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if(fd == -1)
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return false;
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// set non blocking
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int flags = fcntl(fd, F_GETFL, 0);
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if(flags == -1)
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return false;
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return fcntl(fd, F_SETFL, flags | O_NONBLOCK) != -1;
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}
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}; // namespace llarp
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bool
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llarp_epoll_loop::tcp_connect(struct llarp_tcp_connecter* tcp,
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const sockaddr* remoteaddr)
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{
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// create socket
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int fd = ::socket(remoteaddr->sa_family, SOCK_STREAM, 0);
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if(fd == -1)
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return false;
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// set non blocking
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int flags = fcntl(fd, F_GETFL, 0);
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if(flags == -1)
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{
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::close(fd);
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return false;
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}
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if(fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
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{
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::close(fd);
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return false;
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}
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llarp::tcp_conn* conn = new llarp::tcp_conn(this, fd, remoteaddr, tcp);
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add_ev(conn, true);
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conn->connect();
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return true;
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}
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llarp::ev_io*
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llarp_epoll_loop::bind_tcp(llarp_tcp_acceptor* tcp, const sockaddr* bindaddr)
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{
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int fd = ::socket(bindaddr->sa_family, SOCK_STREAM, 0);
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if(fd == -1)
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return nullptr;
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socklen_t sz = sizeof(sockaddr_in);
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if(bindaddr->sa_family == AF_INET6)
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{
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sz = sizeof(sockaddr_in6);
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}
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else if(bindaddr->sa_family == AF_UNIX)
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{
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sz = sizeof(sockaddr_un);
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}
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if(::bind(fd, bindaddr, sz) == -1)
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{
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::close(fd);
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return nullptr;
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}
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if(::listen(fd, 5) == -1)
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{
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::close(fd);
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return nullptr;
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}
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return new llarp::tcp_serv(this, fd, tcp);
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}
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bool
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llarp_epoll_loop::udp_listen(llarp_udp_io* l, const sockaddr* src)
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{
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auto ev = create_udp(l, src);
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if(ev)
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l->fd = ev->fd;
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return ev && add_ev(ev, false);
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}
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bool
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llarp_epoll_loop::running() const
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{
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return epollfd != -1;
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}
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bool
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llarp_epoll_loop::init()
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{
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if(epollfd == -1)
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epollfd = epoll_create(1);
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return false;
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}
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int
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llarp_epoll_loop::tick(int ms)
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{
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epoll_event events[1024];
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int result;
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result = epoll_wait(epollfd, events, 1024, ms);
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if(result > 0)
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{
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int idx = 0;
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while(idx < result)
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{
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llarp::ev_io* ev = static_cast< llarp::ev_io* >(events[idx].data.ptr);
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if(ev)
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{
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llarp::LogDebug(idx, " of ", result,
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" events=", std::to_string(events[idx].events));
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if(events[idx].events & EPOLLERR)
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{
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ev->error();
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}
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else
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{
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if(events[idx].events & EPOLLIN)
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{
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ev->read(readbuf, sizeof(readbuf));
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}
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if(events[idx].events & EPOLLOUT)
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{
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ev->flush_write();
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}
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}
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}
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++idx;
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}
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}
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if(result != -1)
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tick_listeners();
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return result;
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}
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int
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llarp_epoll_loop::run()
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{
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epoll_event events[1024];
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int result;
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do
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{
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result = epoll_wait(epollfd, events, 1024, EV_TICK_INTERVAL);
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if(result > 0)
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{
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int idx = 0;
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while(idx < result)
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{
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llarp::ev_io* ev = static_cast< llarp::ev_io* >(events[idx].data.ptr);
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if(ev)
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{
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if(events[idx].events & EPOLLERR)
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{
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ev->error();
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}
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else
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{
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if(events[idx].events & EPOLLIN)
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{
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ev->read(readbuf, sizeof(readbuf));
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}
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if(events[idx].events & EPOLLOUT)
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{
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ev->flush_write();
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}
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}
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}
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++idx;
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}
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}
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if(result != -1)
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tick_listeners();
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} while(epollfd != -1);
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return result;
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}
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int
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llarp_epoll_loop::udp_bind(const sockaddr* addr)
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{
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socklen_t slen;
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switch(addr->sa_family)
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{
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case AF_INET:
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slen = sizeof(struct sockaddr_in);
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break;
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case AF_INET6:
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slen = sizeof(struct sockaddr_in6);
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break;
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default:
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return -1;
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}
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int fd = socket(addr->sa_family, SOCK_DGRAM, 0);
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if(fd == -1)
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{
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perror("socket()");
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return -1;
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}
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if(addr->sa_family == AF_INET6)
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{
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// enable dual stack explicitly
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int dual = 1;
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if(setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &dual, sizeof(dual)) == -1)
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{
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// failed
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perror("setsockopt()");
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close(fd);
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return -1;
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}
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}
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llarp::Addr a(*addr);
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llarp::LogDebug("bind to ", a);
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if(bind(fd, addr, slen) == -1)
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{
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perror("bind()");
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close(fd);
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return -1;
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}
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return fd;
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}
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bool
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llarp_epoll_loop::close_ev(llarp::ev_io* ev)
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{
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return epoll_ctl(epollfd, EPOLL_CTL_DEL, ev->fd, nullptr) != -1;
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}
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llarp::ev_io*
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llarp_epoll_loop::create_tun(llarp_tun_io* tun)
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{
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llarp::tun* t = new llarp::tun(tun, this);
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if(tun->get_fd_promise)
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{
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}
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else if(t->setup())
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{
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return t;
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}
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delete t;
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return nullptr;
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}
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llarp::ev_io*
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llarp_epoll_loop::create_udp(llarp_udp_io* l, const sockaddr* src)
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{
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int fd = udp_bind(src);
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if(fd == -1)
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return nullptr;
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llarp::ev_io* listener = new llarp::udp_listener(fd, l);
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l->impl = listener;
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return listener;
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}
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bool
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llarp_epoll_loop::add_ev(llarp::ev_io* e, bool write)
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{
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epoll_event ev;
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ev.data.ptr = e;
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ev.events = EPOLLIN | EPOLLERR;
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if(write)
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ev.events |= EPOLLOUT;
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if(epoll_ctl(epollfd, EPOLL_CTL_ADD, e->fd, &ev) == -1)
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{
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delete e;
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return false;
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}
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handlers.emplace_back(e);
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return true;
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}
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bool
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llarp_epoll_loop::udp_close(llarp_udp_io* l)
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{
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bool ret = false;
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llarp::udp_listener* listener = static_cast< llarp::udp_listener* >(l->impl);
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if(listener)
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{
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close_ev(listener);
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// remove handler
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auto itr = handlers.begin();
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while(itr != handlers.end())
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{
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if(itr->get() == listener)
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itr = handlers.erase(itr);
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else
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++itr;
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}
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l->impl = nullptr;
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ret = true;
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}
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return ret;
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}
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void
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llarp_epoll_loop::stop()
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{
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// close all handlers before closing the epoll fd
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auto itr = handlers.begin();
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while(itr != handlers.end())
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{
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close_ev(itr->get());
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itr = handlers.erase(itr);
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}
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if(epollfd != -1)
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close(epollfd);
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epollfd = -1;
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} |