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samba-mirror/ctdb/tcp/tcp_connect.c
Martin Schwenke 80a2bb84e7 ctdbd: Remove debug option --node-ip, use --listen instead
This effectively reverts d96cb02c2c24f9eabbc53d3d38e90dea49cff3e0

Signed-off-by: Martin Schwenke <martin@meltin.net>
Pair-programmed-with: Amitay Isaacs <amitay@gmail.com>

(This used to be ctdb commit 496387a585b2c5778c808cf02b8e1435abde4c3e)
2013-01-07 10:35:39 +11:00

488 lines
13 KiB
C

/*
ctdb over TCP
Copyright (C) Andrew Tridgell 2006
Copyright (C) Ronnie Sahlberg 2008
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "lib/tdb/include/tdb.h"
#include "system/network.h"
#include "system/filesys.h"
#include "../include/ctdb_private.h"
#include "ctdb_tcp.h"
/*
stop any connecting (established or pending) to a node
*/
void ctdb_tcp_stop_connection(struct ctdb_node *node)
{
struct ctdb_tcp_node *tnode = talloc_get_type(
node->private_data, struct ctdb_tcp_node);
ctdb_queue_set_fd(tnode->out_queue, -1);
talloc_free(tnode->connect_te);
talloc_free(tnode->connect_fde);
tnode->connect_fde = NULL;
tnode->connect_te = NULL;
if (tnode->fd != -1) {
close(tnode->fd);
tnode->fd = -1;
}
}
/*
called when a complete packet has come in - should not happen on this socket
unless the other side closes the connection with RST or FIN
*/
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);
if (data == NULL) {
node->ctdb->upcalls->node_dead(node);
}
ctdb_tcp_stop_connection(node);
tnode->connect_te = event_add_timed(node->ctdb->ev, tnode,
timeval_current_ofs(3, 0),
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;
talloc_free(tnode->connect_te);
tnode->connect_te = NULL;
if (getsockopt(tnode->fd, SOL_SOCKET, SO_ERROR, &error, &len) != 0 ||
error != 0) {
ctdb_tcp_stop_connection(node);
tnode->connect_te = event_add_timed(ctdb->ev, tnode,
timeval_current_ofs(1, 0),
ctdb_tcp_node_connect, node);
return;
}
talloc_free(tnode->connect_fde);
tnode->connect_fde = NULL;
setsockopt(tnode->fd,IPPROTO_TCP,TCP_NODELAY,(char *)&one,sizeof(one));
setsockopt(tnode->fd,SOL_SOCKET,SO_KEEPALIVE,(char *)&one,sizeof(one));
ctdb_queue_set_fd(tnode->out_queue, tnode->fd);
/* the queue subsystem now owns this fd */
tnode->fd = -1;
}
static int ctdb_tcp_get_address(struct ctdb_context *ctdb,
const char *address, ctdb_sock_addr *addr)
{
if (parse_ip(address, NULL, 0, addr) == 0) {
DEBUG(DEBUG_CRIT, (__location__ " Unparsable address : %s.\n", address));
return -1;
}
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;
ctdb_sock_addr sock_in;
int sockin_size;
int sockout_size;
ctdb_sock_addr sock_out;
ctdb_tcp_stop_connection(node);
ZERO_STRUCT(sock_out);
#ifdef HAVE_SOCK_SIN_LEN
sock_out.ip.sin_len = sizeof(sock_out);
#endif
if (ctdb_tcp_get_address(ctdb, node->address.address, &sock_out) != 0) {
return;
}
switch (sock_out.sa.sa_family) {
case AF_INET:
sock_out.ip.sin_port = htons(node->address.port);
break;
case AF_INET6:
sock_out.ip6.sin6_port = htons(node->address.port);
break;
default:
DEBUG(DEBUG_ERR, (__location__ " unknown family %u\n",
sock_out.sa.sa_family));
return;
}
tnode->fd = socket(sock_out.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
set_nonblocking(tnode->fd);
set_close_on_exec(tnode->fd);
DEBUG(DEBUG_DEBUG, (__location__ " Created TCP SOCKET FD:%d\n", tnode->fd));
/* 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.
*/
ZERO_STRUCT(sock_in);
if (ctdb_tcp_get_address(ctdb, ctdb->address.address, &sock_in) != 0) {
DEBUG(DEBUG_ERR, (__location__ " Failed to find our address. Failing bind.\n"));
close(tnode->fd);
return;
}
/* AIX libs check to see if the socket address and length
arguments are consistent with each other on calls like
connect(). Can not get by with just sizeof(sock_in),
need sizeof(sock_in.ip).
*/
switch (sock_in.sa.sa_family) {
case AF_INET:
sockin_size = sizeof(sock_in.ip);
sockout_size = sizeof(sock_out.ip);
break;
case AF_INET6:
sockin_size = sizeof(sock_in.ip6);
sockout_size = sizeof(sock_out.ip6);
break;
default:
DEBUG(DEBUG_ERR, (__location__ " unknown family %u\n",
sock_in.sa.sa_family));
close(tnode->fd);
return;
}
#ifdef HAVE_SOCK_SIN_LEN
sock_in.ip.sin_len = sockin_size;
sock_out.ip.sin_len = sockout_size;
#endif
bind(tnode->fd, (struct sockaddr *)&sock_in, sockin_size);
if (connect(tnode->fd, (struct sockaddr *)&sock_out, sockout_size) != 0 &&
errno != EINPROGRESS) {
ctdb_tcp_stop_connection(node);
tnode->connect_te = event_add_timed(ctdb->ev, tnode,
timeval_current_ofs(1, 0),
ctdb_tcp_node_connect, node);
return;
}
/* non-blocking connect - wait for write event */
tnode->connect_fde = event_add_fd(node->ctdb->ev, tnode, tnode->fd,
EVENT_FD_WRITE|EVENT_FD_READ,
ctdb_node_connect_write, node);
/* don't give it long to connect - retry in one second. This ensures
that we find a node is up quickly (tcp normally backs off a syn reply
delay by quite a lot) */
tnode->connect_te = event_add_timed(ctdb->ev, tnode, timeval_current_ofs(1, 0),
ctdb_tcp_node_connect, 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_data)
{
struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
struct ctdb_tcp *ctcp = talloc_get_type(ctdb->private_data, struct ctdb_tcp);
ctdb_sock_addr addr;
socklen_t len;
int fd, nodeid;
struct ctdb_incoming *in;
int one = 1;
const char *incoming_node;
memset(&addr, 0, sizeof(addr));
len = sizeof(addr);
fd = accept(ctcp->listen_fd, (struct sockaddr *)&addr, &len);
if (fd == -1) return;
incoming_node = ctdb_addr_to_str(&addr);
nodeid = ctdb_ip_to_nodeid(ctdb, incoming_node);
if (nodeid == -1) {
DEBUG(DEBUG_ERR, ("Refused connection from unknown node %s\n", incoming_node));
close(fd);
return;
}
in = talloc_zero(ctcp, struct ctdb_incoming);
in->fd = fd;
in->ctdb = ctdb;
set_nonblocking(in->fd);
set_close_on_exec(in->fd);
DEBUG(DEBUG_DEBUG, (__location__ " Created SOCKET FD:%d to incoming ctdb connection\n", fd));
setsockopt(in->fd,SOL_SOCKET,SO_KEEPALIVE,(char *)&one,sizeof(one));
in->queue = ctdb_queue_setup(ctdb, in, in->fd, CTDB_TCP_ALIGNMENT,
ctdb_tcp_read_cb, in, "ctdbd-%s", incoming_node);
}
/*
automatically find which address to listen on
*/
static int ctdb_tcp_listen_automatic(struct ctdb_context *ctdb)
{
struct ctdb_tcp *ctcp = talloc_get_type(ctdb->private_data,
struct ctdb_tcp);
ctdb_sock_addr sock;
int lock_fd, i;
const char *lock_path = "/tmp/.ctdb_socket_lock";
struct flock lock;
int one = 1;
int sock_size;
struct tevent_fd *fde;
/* If there are no nodes, then it won't be possible to find
* the first one. Log a failure and short circuit the whole
* process.
*/
if (ctdb->num_nodes == 0) {
DEBUG(DEBUG_CRIT,("No nodes available to attempt bind to - is the nodes file empty?\n"));
return -1;
}
/* in order to ensure that we don't get two nodes with the
same adddress, we must make the bind() and listen() calls
atomic. The SO_REUSEADDR setsockopt only prevents double
binds if the first socket is in LISTEN state */
lock_fd = open(lock_path, O_RDWR|O_CREAT, 0666);
if (lock_fd == -1) {
DEBUG(DEBUG_CRIT,("Unable to open %s\n", lock_path));
return -1;
}
lock.l_type = F_WRLCK;
lock.l_whence = SEEK_SET;
lock.l_start = 0;
lock.l_len = 1;
lock.l_pid = 0;
if (fcntl(lock_fd, F_SETLKW, &lock) != 0) {
DEBUG(DEBUG_CRIT,("Unable to lock %s\n", lock_path));
close(lock_fd);
return -1;
}
for (i=0; i < ctdb->num_nodes; i++) {
if (ctdb->nodes[i]->flags & NODE_FLAGS_DELETED) {
continue;
}
ZERO_STRUCT(sock);
if (ctdb_tcp_get_address(ctdb,
ctdb->nodes[i]->address.address,
&sock) != 0) {
continue;
}
switch (sock.sa.sa_family) {
case AF_INET:
sock.ip.sin_port = htons(ctdb->nodes[i]->address.port);
sock_size = sizeof(sock.ip);
break;
case AF_INET6:
sock.ip6.sin6_port = htons(ctdb->nodes[i]->address.port);
sock_size = sizeof(sock.ip6);
break;
default:
DEBUG(DEBUG_ERR, (__location__ " unknown family %u\n",
sock.sa.sa_family));
continue;
}
#ifdef HAVE_SOCK_SIN_LEN
sock.ip.sin_len = sock_size;
#endif
ctcp->listen_fd = socket(sock.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
if (ctcp->listen_fd == -1) {
ctdb_set_error(ctdb, "socket failed\n");
continue;
}
set_close_on_exec(ctcp->listen_fd);
setsockopt(ctcp->listen_fd,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one));
if (bind(ctcp->listen_fd, (struct sockaddr * )&sock, sock_size) == 0) {
break;
}
if (errno == EADDRNOTAVAIL) {
DEBUG(DEBUG_DEBUG,(__location__ " Failed to bind() to socket. %s(%d)\n",
strerror(errno), errno));
} else {
DEBUG(DEBUG_ERR,(__location__ " Failed to bind() to socket. %s(%d)\n",
strerror(errno), errno));
}
}
if (i == ctdb->num_nodes) {
DEBUG(DEBUG_CRIT,("Unable to bind to any of the node addresses - giving up\n"));
goto failed;
}
ctdb->address.address = talloc_strdup(ctdb, ctdb->nodes[i]->address.address);
ctdb->address.port = ctdb->nodes[i]->address.port;
ctdb->name = talloc_asprintf(ctdb, "%s:%u",
ctdb->address.address,
ctdb->address.port);
ctdb->pnn = ctdb->nodes[i]->pnn;
ctdb->nodes[i]->flags &= ~NODE_FLAGS_DISCONNECTED;
DEBUG(DEBUG_INFO,("ctdb chose network address %s:%u pnn %u\n",
ctdb->address.address,
ctdb->address.port,
ctdb->pnn));
/* do we start out in DISABLED mode? */
if (ctdb->start_as_disabled != 0) {
DEBUG(DEBUG_INFO, ("This node is configured to start in DISABLED state\n"));
ctdb->nodes[i]->flags |= NODE_FLAGS_DISABLED;
}
/* do we start out in STOPPED mode? */
if (ctdb->start_as_stopped != 0) {
DEBUG(DEBUG_INFO, ("This node is configured to start in STOPPED state\n"));
ctdb->nodes[i]->flags |= NODE_FLAGS_STOPPED;
}
if (listen(ctcp->listen_fd, 10) == -1) {
goto failed;
}
fde = event_add_fd(ctdb->ev, ctcp, ctcp->listen_fd, EVENT_FD_READ,
ctdb_listen_event, ctdb);
tevent_fd_set_auto_close(fde);
close(lock_fd);
return 0;
failed:
close(lock_fd);
close(ctcp->listen_fd);
ctcp->listen_fd = -1;
return -1;
}
/*
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);
ctdb_sock_addr sock;
int sock_size;
int one = 1;
struct tevent_fd *fde;
/* we can either auto-bind to the first available address, or we can
use a specified address */
if (!ctdb->address.address) {
return ctdb_tcp_listen_automatic(ctdb);
}
ZERO_STRUCT(sock);
if (ctdb_tcp_get_address(ctdb, ctdb->address.address,
&sock) != 0) {
goto failed;
}
switch (sock.sa.sa_family) {
case AF_INET:
sock.ip.sin_port = htons(ctdb->address.port);
sock_size = sizeof(sock.ip);
break;
case AF_INET6:
sock.ip6.sin6_port = htons(ctdb->address.port);
sock_size = sizeof(sock.ip6);
break;
default:
DEBUG(DEBUG_ERR, (__location__ " unknown family %u\n",
sock.sa.sa_family));
goto failed;
}
#ifdef HAVE_SOCK_SIN_LEN
sock.ip.sin_len = sock_size;
#endif
ctcp->listen_fd = socket(sock.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
if (ctcp->listen_fd == -1) {
ctdb_set_error(ctdb, "socket failed\n");
return -1;
}
set_close_on_exec(ctcp->listen_fd);
setsockopt(ctcp->listen_fd,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one));
if (bind(ctcp->listen_fd, (struct sockaddr * )&sock, sock_size) != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to bind() to socket. %s(%d)\n", strerror(errno), errno));
goto failed;
}
if (listen(ctcp->listen_fd, 10) == -1) {
goto failed;
}
fde = event_add_fd(ctdb->ev, ctcp, ctcp->listen_fd, EVENT_FD_READ,
ctdb_listen_event, ctdb);
tevent_fd_set_auto_close(fde);
return 0;
failed:
if (ctcp->listen_fd != -1) {
close(ctcp->listen_fd);
}
ctcp->listen_fd = -1;
return -1;
}