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samba-mirror/ctdb/tcp/tcp_connect.c

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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 "system/network.h"
#include "system/filesys.h"
#include "ctdb_private.h"
#include "ctdb_tcp.h"
/*
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)
{
struct ctdb_node *node = talloc_get_type(private, struct ctdb_node);
struct ctdb_tcp_node *tnode = talloc_get_type(node->private,
struct ctdb_tcp_node);
struct ctdb_context *ctdb = node->ctdb;
int error;
socklen_t len;
if (getsockopt(tnode->fd, SOL_SOCKET, SO_ERROR, &error, &len) != 0 ||
error != 0) {
if (error == EINPROGRESS) {
printf("connect in progress\n");
return;
}
printf("getsockopt errno=%s\n", strerror(errno));
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;
}
printf("Established connection to %s:%u\n",
node->address.address, node->address.port);
talloc_free(fde);
event_add_fd(node->ctdb->ev, node, tnode->fd, EVENT_FD_READ,
ctdb_tcp_node_read, node);
}
/*
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)
{
struct ctdb_node *node = talloc_get_type(private, struct ctdb_node);
struct ctdb_tcp_node *tnode = talloc_get_type(node->private,
struct ctdb_tcp_node);
struct ctdb_context *ctdb = node->ctdb;
unsigned v;
struct sockaddr_in sock_out;
tnode->fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
v = fcntl(tnode->fd, F_GETFL, 0);
fcntl(tnode->fd, F_SETFL, v | O_NONBLOCK);
inet_pton(AF_INET, node->address.address, &sock_out.sin_addr);
sock_out.sin_port = htons(node->address.port);
sock_out.sin_family = PF_INET;
if (connect(tnode->fd, &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,
ctdb_node_connect_write, node);
}
/*
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)
{
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, struct ctdb_context);
ctcp = talloc_get_type(ctdb->private, 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(ctdb, struct ctdb_incoming);
in->fd = fd;
in->ctdb = ctdb;
event_add_fd(ctdb->ev, in, in->fd, EVENT_FD_READ,
ctdb_tcp_incoming_read, in);
printf("New incoming socket %d\n", in->fd);
}
/*
listen on our own address
*/
int ctdb_tcp_listen(struct ctdb_context *ctdb)
{
struct ctdb_tcp *ctcp = talloc_get_type(ctdb->private, struct ctdb_tcp);
struct sockaddr_in sock;
int one = 1;
sock.sin_port = htons(ctdb->address.port);
sock.sin_family = PF_INET;
inet_pton(AF_INET, ctdb->address.address, &sock.sin_addr);
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;
}