mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-11-13 01:10:24 +00:00
371 lines
6.9 KiB
C++
371 lines
6.9 KiB
C++
#ifndef EV_EPOLL_HPP
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#define EV_EPOLL_HPP
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#include <fcntl.h>
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#include <llarp/buffer.h>
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#include <llarp/net.h>
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#include <signal.h>
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#include <sys/epoll.h>
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#include <tuntap.h>
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#include <unistd.h>
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#include <cstdio>
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#include "buffer.hpp"
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#include "ev.hpp"
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#include "llarp/net.hpp"
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#include "logger.hpp"
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#include "mem.hpp"
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namespace llarp
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{
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struct tcp_serv : public ev_io
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{
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};
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struct tcp_conn : public ev_io
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{
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};
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struct udp_listener : public ev_io
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{
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llarp_udp_io* udp;
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udp_listener(int fd, llarp_udp_io* u) : ev_io(fd), udp(u){};
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~udp_listener()
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{
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}
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virtual void
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tick()
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{
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if(udp->tick)
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udp->tick(udp);
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}
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virtual int
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read(void* buf, size_t sz)
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{
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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, buf, sz, 0, addr, &slen);
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if(ret == -1)
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return -1;
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if(ret > sz)
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return -1;
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udp->recvfrom(udp, addr, buf, ret);
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return 0;
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}
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virtual int
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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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};
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struct tun : public ev_io
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{
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llarp_tun_io* t;
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device* tunif;
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tun(llarp_tun_io* tio)
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: ev_io(-1)
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, t(tio)
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, tunif(tuntap_init())
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{
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};
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int
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sendto(const sockaddr* to, const void* data, size_t sz)
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{
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return -1;
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}
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virtual void
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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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}
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void
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flush_write()
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{
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if(t->before_write)
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{
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t->before_write(t);
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}
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ev_io::flush_write();
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}
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int
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read(void* 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, buf, ret);
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}
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return ret;
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}
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bool
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setup()
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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(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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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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~tun()
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{
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}
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};
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}; // namespace llarp
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struct llarp_epoll_loop : public llarp_ev_loop
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{
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int epollfd;
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llarp_epoll_loop() : epollfd(-1)
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{
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}
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~llarp_epoll_loop()
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{
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if(epollfd != -1)
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close(epollfd);
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}
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bool
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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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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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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(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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++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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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(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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++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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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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close_ev(llarp::ev_io* ev)
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{
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if(epoll_ctl(epollfd, EPOLL_CTL_DEL, ev->fd, nullptr) == -1)
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return false;
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// deallocate
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std::remove_if(handlers.begin(), handlers.end(),
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[ev](const std::unique_ptr< llarp::ev_io >& i) -> bool {
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return i.get() == ev;
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});
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return true;
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}
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llarp::ev_io*
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create_tun(llarp_tun_io* tun)
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{
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llarp::tun* t = new llarp::tun(tun);
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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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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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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;
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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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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 =
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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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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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stop()
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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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}
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};
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#endif
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