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,
+ 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
- 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
+ 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/events/events.h"
+#include "lib/tevent/tevent.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)
+/*
+ stop any connecting (established or pending) to a node
+ */
+void ctdb_tcp_stop_connection(struct ctdb_node *node)
{
- unsigned v;
- v = fcntl(fd, F_GETFL, 0);
- fcntl(fd, F_SETFL, v | O_NONBLOCK);
+ 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)
{
node->ctdb->upcalls->node_dead(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);
+ 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);
}
/*
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) {
- 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);
+ 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(fde);
-
+ 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->queue, tnode->fd);
+ ctdb_queue_set_fd(tnode->out_queue, tnode->fd);
- /* tell the ctdb layer we are connected */
- node->ctdb->upcalls->node_connected(node);
+ /* the queue subsystem now owns this fd */
+ tnode->fd = -1;
}
static int ctdb_tcp_get_address(struct ctdb_context *ctdb,
- const char *address, struct in_addr *addr)
+ const char *address, ctdb_sock_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);
+ if (parse_ip(address, NULL, 0, addr) == 0) {
+ DEBUG(DEBUG_CRIT, (__location__ " Unparsable address : %s.\n", address));
+ return -1;
}
return 0;
}
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) {
+ 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;
}
- sock_out.sin_port = htons(node->address.port);
- sock_out.sin_family = PF_INET;
+ 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.
* 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) {
+ 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;
}
- 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 */
+ /* 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);
- event_add_timed(ctdb->ev, node, timeval_current_ofs(1, 0),
- ctdb_tcp_node_connect, node);
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);
- /* 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);
-}
+ 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;
+ }
-/*
- destroy a ctdb_incoming structure
-*/
-static int ctdb_incoming_destructor(struct ctdb_incoming *in)
-{
- close(in->fd);
- in->fd = -1;
- return 0;
+ /* 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);
}
/*
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;
+ 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;
+ int fd, nodeid;
struct ctdb_incoming *in;
+ int one = 1;
+ const char *incoming_node;
- 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);
+ 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);
+ 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;
+
+ /* 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;
+ }
- talloc_set_destructor(in, ctdb_incoming_destructor);
+ /* if node_ip is specified we will only try to bind to that
+ ip.
+ */
+ if (ctdb->node_ip != NULL) {
+ if (strcmp(ctdb->node_ip, ctdb->nodes[i]->address.address)) {
+ 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;
}
{
struct ctdb_tcp *ctcp = talloc_get_type(ctdb->private_data,
struct ctdb_tcp);
- struct sockaddr_in sock;
+ ctdb_sock_addr sock;
+ int sock_size;
int one = 1;
+ struct tevent_fd *fde;
- 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;
+ /* 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);
}
- ctcp->listen_fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
- if (ctcp->listen_fd == -1) {
+ 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, sizeof(sock)) != 0) {
- ctdb_set_error(ctdb, "bind failed\n");
- close(ctcp->listen_fd);
- ctcp->listen_fd = -1;
- return -1;
- }
+ 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) {
- ctdb_set_error(ctdb, "listen failed\n");
- close(ctcp->listen_fd);
- ctcp->listen_fd = -1;
- return -1;
+ goto failed;
}
- event_add_fd(ctdb->ev, ctdb, ctcp->listen_fd, EVENT_FD_READ,
+ 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;
}
git.samba.org / sahlberg / ctdb.git / blobdiff