/
Accepter.cc
315 lines (260 loc) · 8.29 KB
/
Accepter.cc
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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include <sys/socket.h>
#include <netinet/tcp.h>
#include <sys/uio.h>
#include <limits.h>
#include <poll.h>
#include "msg/Message.h"
#include "Accepter.h"
#include "Pipe.h"
#include "SimpleMessenger.h"
#include "common/debug.h"
#include "common/errno.h"
#define dout_subsys ceph_subsys_ms
#undef dout_prefix
#define dout_prefix *_dout << "accepter."
/********************************************
* Accepter
*/
static int set_close_on_exec(int fd)
{
int flags = fcntl(fd, F_GETFD, 0);
if (flags < 0) {
return errno;
}
if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC)) {
return errno;
}
return 0;
}
int Accepter::bind(const entity_addr_t &bind_addr, const set<int>& avoid_ports)
{
const md_config_t *conf = msgr->cct->_conf;
// bind to a socket
ldout(msgr->cct,10) << "accepter.bind" << dendl;
int family;
switch (bind_addr.get_family()) {
case AF_INET:
case AF_INET6:
family = bind_addr.get_family();
break;
default:
// bind_addr is empty
family = conf->ms_bind_ipv6 ? AF_INET6 : AF_INET;
}
/* socket creation */
listen_sd = ::socket(family, SOCK_STREAM, 0);
if (listen_sd < 0) {
lderr(msgr->cct) << "accepter.bind unable to create socket: "
<< cpp_strerror(errno) << dendl;
return -errno;
}
if (set_close_on_exec(listen_sd)) {
lderr(msgr->cct) << "accepter.bind unable to set_close_exec(): "
<< cpp_strerror(errno) << dendl;
}
// use whatever user specified (if anything)
entity_addr_t listen_addr = bind_addr;
listen_addr.set_family(family);
/* bind to port */
int rc = -1;
int r = -1;
for (int i = 0; i < conf->ms_bind_retry_count; i++) {
if (i > 0) {
lderr(msgr->cct) << "accepter.bind was unable to bind. Trying again in " << conf->ms_bind_retry_delay << " seconds " << dendl;
sleep(conf->ms_bind_retry_delay);
}
if (listen_addr.get_port()) {
// specific port
// reuse addr+port when possible
int on = 1;
rc = ::setsockopt(listen_sd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
if (rc < 0) {
lderr(msgr->cct) << "accepter.bind unable to setsockopt: "
<< cpp_strerror(errno) << dendl;
r = -errno;
continue;
}
rc = ::bind(listen_sd, listen_addr.get_sockaddr(),
listen_addr.get_sockaddr_len());
if (rc < 0) {
lderr(msgr->cct) << "accepter.bind unable to bind to " << listen_addr
<< ": " << cpp_strerror(errno) << dendl;
r = -errno;
continue;
}
} else {
// try a range of ports
for (int port = msgr->cct->_conf->ms_bind_port_min; port <= msgr->cct->_conf->ms_bind_port_max; port++) {
if (avoid_ports.count(port))
continue;
listen_addr.set_port(port);
rc = ::bind(listen_sd, listen_addr.get_sockaddr(),
listen_addr.get_sockaddr_len());
if (rc == 0)
break;
}
if (rc < 0) {
lderr(msgr->cct) << "accepter.bind unable to bind to " << listen_addr
<< " on any port in range " << msgr->cct->_conf->ms_bind_port_min
<< "-" << msgr->cct->_conf->ms_bind_port_max
<< ": " << cpp_strerror(errno)
<< dendl;
r = -errno;
listen_addr.set_port(0); //Clear port before retry, otherwise we shall fail again.
continue;
}
ldout(msgr->cct,10) << "accepter.bind bound on random port " << listen_addr << dendl;
}
if (rc == 0)
break;
}
// It seems that binding completely failed, return with that exit status
if (rc < 0) {
lderr(msgr->cct) << "accepter.bind was unable to bind after " << conf->ms_bind_retry_count << " attempts: " << cpp_strerror(errno) << dendl;
return r;
}
// what port did we get?
sockaddr_storage ss;
socklen_t llen = sizeof(ss);
rc = getsockname(listen_sd, (sockaddr*)&ss, &llen);
if (rc < 0) {
rc = -errno;
lderr(msgr->cct) << "accepter.bind failed getsockname: " << cpp_strerror(rc) << dendl;
return rc;
}
listen_addr.set_sockaddr((sockaddr*)&ss);
if (msgr->cct->_conf->ms_tcp_rcvbuf) {
int size = msgr->cct->_conf->ms_tcp_rcvbuf;
rc = ::setsockopt(listen_sd, SOL_SOCKET, SO_RCVBUF, (void*)&size, sizeof(size));
if (rc < 0) {
rc = -errno;
lderr(msgr->cct) << "accepter.bind failed to set SO_RCVBUF to " << size << ": " << cpp_strerror(rc) << dendl;
return rc;
}
}
ldout(msgr->cct,10) << "accepter.bind bound to " << listen_addr << dendl;
// listen!
rc = ::listen(listen_sd, 128);
if (rc < 0) {
rc = -errno;
lderr(msgr->cct) << "accepter.bind unable to listen on " << listen_addr
<< ": " << cpp_strerror(rc) << dendl;
return rc;
}
msgr->set_myaddr(bind_addr);
if (bind_addr != entity_addr_t())
msgr->learned_addr(bind_addr);
else
assert(msgr->get_need_addr()); // should still be true.
if (msgr->get_myaddr().get_port() == 0) {
msgr->set_myaddr(listen_addr);
}
entity_addr_t addr = msgr->get_myaddr();
addr.nonce = nonce;
msgr->set_myaddr(addr);
msgr->init_local_connection();
ldout(msgr->cct,1) << "accepter.bind my_inst.addr is " << msgr->get_myaddr()
<< " need_addr=" << msgr->get_need_addr() << dendl;
return 0;
}
int Accepter::rebind(const set<int>& avoid_ports)
{
ldout(msgr->cct,1) << "accepter.rebind avoid " << avoid_ports << dendl;
entity_addr_t addr = msgr->get_myaddr();
set<int> new_avoid = avoid_ports;
new_avoid.insert(addr.get_port());
addr.set_port(0);
// adjust the nonce; we want our entity_addr_t to be truly unique.
nonce += 1000000;
msgr->my_inst.addr.nonce = nonce;
ldout(msgr->cct,10) << " new nonce " << nonce << " and inst " << msgr->my_inst << dendl;
ldout(msgr->cct,10) << " will try " << addr << " and avoid ports " << new_avoid << dendl;
int r = bind(addr, new_avoid);
if (r == 0)
start();
return r;
}
int Accepter::start()
{
ldout(msgr->cct,1) << "accepter.start" << dendl;
// start thread
create("ms_accepter");
return 0;
}
void *Accepter::entry()
{
ldout(msgr->cct,10) << "accepter starting" << dendl;
int errors = 0;
struct pollfd pfd;
pfd.fd = listen_sd;
pfd.events = POLLIN | POLLERR | POLLNVAL | POLLHUP;
while (!done) {
ldout(msgr->cct,20) << "accepter calling poll" << dendl;
int r = poll(&pfd, 1, -1);
if (r < 0)
break;
ldout(msgr->cct,20) << "accepter poll got " << r << dendl;
if (pfd.revents & (POLLERR | POLLNVAL | POLLHUP))
break;
ldout(msgr->cct,10) << "pfd.revents=" << pfd.revents << dendl;
if (done) break;
// accept
sockaddr_storage ss;
socklen_t slen = sizeof(ss);
int sd = ::accept(listen_sd, (sockaddr*)&ss, &slen);
if (sd >= 0) {
int r = set_close_on_exec(sd);
if (r) {
ldout(msgr->cct,0) << "accepter set_close_on_exec() failed "
<< cpp_strerror(r) << dendl;
}
errors = 0;
ldout(msgr->cct,10) << "accepted incoming on sd " << sd << dendl;
msgr->add_accept_pipe(sd);
} else {
ldout(msgr->cct,0) << "accepter no incoming connection? sd = " << sd
<< " errno " << errno << " " << cpp_strerror(errno) << dendl;
if (++errors > 4)
break;
}
}
ldout(msgr->cct,20) << "accepter closing" << dendl;
// don't close socket, in case we start up again? blech.
if (listen_sd >= 0) {
::close(listen_sd);
listen_sd = -1;
}
ldout(msgr->cct,10) << "accepter stopping" << dendl;
return 0;
}
void Accepter::stop()
{
done = true;
ldout(msgr->cct,10) << "stop accepter" << dendl;
if (listen_sd >= 0) {
::shutdown(listen_sd, SHUT_RDWR);
}
// wait for thread to stop before closing the socket, to avoid
// racing against fd re-use.
if (is_started()) {
join();
}
if (listen_sd >= 0) {
::close(listen_sd);
listen_sd = -1;
}
done = false;
}