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/*
ctdb over TCP
Copyright (C) Andrew Tridgell 2006
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "includes.h"
#include "lib/events/events.h"
#include "lib/tdb/include/tdb.h"
#include "system/network.h"
#include "system/filesys.h"
#include "../include/ctdb_private.h"
#include "ctdb_tcp.h"
static void set_nonblocking(int fd)
{
unsigned v;
v = fcntl(fd, F_GETFL, 0);
fcntl(fd, F_SETFL, v | O_NONBLOCK);
}
/*
called when a complete packet has come in - should not happen on this socket
*/
void ctdb_tcp_tnode_cb(uint8_t *data, size_t cnt, void *private_data)
{
struct ctdb_node *node = talloc_get_type(private_data, struct ctdb_node);
struct ctdb_tcp_node *tnode = talloc_get_type(
node->private_data, struct ctdb_tcp_node);
/* start a new connect cycle to try to re-establish the
link */
close(tnode->fd);
ctdb_queue_set_fd(tnode->queue, -1);
tnode->fd = -1;
event_add_timed(node->ctdb->ev, node, timeval_zero(),
ctdb_tcp_node_connect, node);
}
/*
called when socket becomes writeable on connect
*/
static void ctdb_node_connect_write(struct event_context *ev, struct fd_event *fde,
uint16_t flags, void *private_data)
{
struct ctdb_node *node = talloc_get_type(private_data,
struct ctdb_node);
struct ctdb_tcp_node *tnode = talloc_get_type(node->private_data,
struct ctdb_tcp_node);
struct ctdb_context *ctdb = node->ctdb;
int error = 0;
socklen_t len = sizeof(error);
int one = 1;
if (getsockopt(tnode->fd, SOL_SOCKET, SO_ERROR, &error, &len) != 0 ||
error != 0) {
talloc_free(fde);
close(tnode->fd);
tnode->fd = -1;
event_add_timed(ctdb->ev, node, timeval_current_ofs(1, 0),
ctdb_tcp_node_connect, node);
return;
}
talloc_free(fde);
setsockopt(tnode->fd,IPPROTO_TCP,TCP_NODELAY,(char *)&one,sizeof(one));
ctdb_queue_set_fd(tnode->queue, tnode->fd);
/* tell the ctdb layer we are connected */
node->ctdb->upcalls->node_connected(node);
}
static int ctdb_tcp_get_address(struct ctdb_context *ctdb,
const char *address, struct in_addr *addr)
{
if (inet_pton(AF_INET, address, addr) <= 0) {
struct hostent *he = gethostbyname(address);
if (he == NULL || he->h_length > sizeof(*addr)) {
ctdb_set_error(ctdb, "invalid nework address '%s'\n",
address);
return -1;
}
memcpy(addr, he->h_addr, he->h_length);
}
return 0;
}
/*
called when we should try and establish a tcp connection to a node
*/
void ctdb_tcp_node_connect(struct event_context *ev, struct timed_event *te,
struct timeval t, void *private_data)
{
struct ctdb_node *node = talloc_get_type(private_data,
struct ctdb_node);
struct ctdb_tcp_node *tnode = talloc_get_type(node->private_data,
struct ctdb_tcp_node);
struct ctdb_context *ctdb = node->ctdb;
struct sockaddr_in sock_in;
struct sockaddr_in sock_out;
tnode->fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
set_nonblocking(tnode->fd);
if (ctdb_tcp_get_address(ctdb, node->address.address, &sock_out.sin_addr) != 0) {
return;
}
sock_out.sin_port = htons(node->address.port);
sock_out.sin_family = PF_INET;
/* Bind our side of the socketpair to the same address we use to listen
* on incoming CTDB traffic.
* We must specify this address to make sure that the address we expose to
* the remote side is actually routable in case CTDB traffic will run on
* a dedicated non-routeable network.
*/
if (ctdb_tcp_get_address(ctdb, ctdb->address.address, &sock_in.sin_addr) != 0) {
return;
}
sock_in.sin_port = htons(0); /* INPORT_ANY is not always available */
sock_in.sin_family = PF_INET;
bind(tnode->fd, (struct sockaddr *)&sock_in, sizeof(sock_in));
if (connect(tnode->fd, (struct sockaddr *)&sock_out, sizeof(sock_out)) != 0 &&
errno != EINPROGRESS) {
/* try again once a second */
close(tnode->fd);
event_add_timed(ctdb->ev, node, timeval_current_ofs(1, 0),
ctdb_tcp_node_connect, node);
return;
}
/* non-blocking connect - wait for write event */
event_add_fd(node->ctdb->ev, node, tnode->fd, EVENT_FD_WRITE|EVENT_FD_READ,
ctdb_node_connect_write, node);
}
/*
destroy a ctdb_incoming structure
*/
static int ctdb_incoming_destructor(struct ctdb_incoming *in)
{
close(in->fd);
in->fd = -1;
return 0;
}
/*
called when we get contacted by another node
currently makes no attempt to check if the connection is really from a ctdb
node in our cluster
*/
static void ctdb_listen_event(struct event_context *ev, struct fd_event *fde,
uint16_t flags, void *private_data)
{
struct ctdb_context *ctdb;
struct ctdb_tcp *ctcp;
struct sockaddr_in addr;
socklen_t len;
int fd;
struct ctdb_incoming *in;
ctdb = talloc_get_type(private_data, struct ctdb_context);
ctcp = talloc_get_type(ctdb->private_data, struct ctdb_tcp);
memset(&addr, 0, sizeof(addr));
len = sizeof(addr);
fd = accept(ctcp->listen_fd, (struct sockaddr *)&addr, &len);
if (fd == -1) return;
in = talloc_zero(ctdb, struct ctdb_incoming);
in->fd = fd;
in->ctdb = ctdb;
set_nonblocking(in->fd);
in->queue = ctdb_queue_setup(ctdb, in, in->fd, CTDB_TCP_ALIGNMENT,
ctdb_tcp_read_cb, in);
talloc_set_destructor(in, ctdb_incoming_destructor);
}
/*
listen on our own address
*/
int ctdb_tcp_listen(struct ctdb_context *ctdb)
{
struct ctdb_tcp *ctcp = talloc_get_type(ctdb->private_data,
struct ctdb_tcp);
struct sockaddr_in sock;
int one = 1;
sock.sin_port = htons(ctdb->address.port);
sock.sin_family = PF_INET;
if (ctdb_tcp_get_address(ctdb, ctdb->address.address, &sock.sin_addr) != 0) {
return -1;
}
ctcp->listen_fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (ctcp->listen_fd == -1) {
ctdb_set_error(ctdb, "socket failed\n");
return -1;
}
setsockopt(ctcp->listen_fd,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one));
if (bind(ctcp->listen_fd, (struct sockaddr * )&sock, sizeof(sock)) != 0) {
ctdb_set_error(ctdb, "bind failed\n");
close(ctcp->listen_fd);
ctcp->listen_fd = -1;
return -1;
}
if (listen(ctcp->listen_fd, 10) == -1) {
ctdb_set_error(ctdb, "listen failed\n");
close(ctcp->listen_fd);
ctcp->listen_fd = -1;
return -1;
}
event_add_fd(ctdb->ev, ctdb, ctcp->listen_fd, EVENT_FD_READ,
ctdb_listen_event, ctdb);
return 0;
}
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