Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 599 insertions, 0 deletions

diff --git a/ctdb/tcp/tcp_connect.c b/ctdb/tcp/tcp_connect.c
new file mode 100644
index 0000000..f7703b7
--- /dev/null
+++ b/ctdb/tcp/tcp_connect.c
@@ -0,0 +1,599 @@
+/* 
+   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 "replace.h"
+#include "system/network.h"
+#include "system/filesys.h"
+
+#include <talloc.h>
+#include <tevent.h>
+
+#include "lib/util/debug.h"
+#include "lib/util/time.h"
+#include "lib/util/blocking.h"
+
+#include "ctdb_private.h"
+
+#include "common/system.h"
+#include "common/common.h"
+#include "common/logging.h"
+
+#include "ctdb_tcp.h"
+
+/*
+  stop any outgoing connection (established or pending) to a node
+ */
+void ctdb_tcp_stop_outgoing(struct ctdb_node *node)
+{
+	struct ctdb_tcp_node *tnode = talloc_get_type(
+		node->transport_data, struct ctdb_tcp_node);
+
+	TALLOC_FREE(tnode->out_queue);
+	TALLOC_FREE(tnode->connect_te);
+	TALLOC_FREE(tnode->connect_fde);
+	if (tnode->out_fd != -1) {
+		close(tnode->out_fd);
+		tnode->out_fd = -1;
+	}
+}
+
+/*
+  stop incoming connection to a node
+ */
+void ctdb_tcp_stop_incoming(struct ctdb_node *node)
+{
+	struct ctdb_tcp_node *tnode = talloc_get_type(
+		node->transport_data, struct ctdb_tcp_node);
+
+	TALLOC_FREE(tnode->in_queue);
+}
+
+/*
+  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);
+
+	node->ctdb->upcalls->node_dead(node);
+
+	TALLOC_FREE(data);
+}
+
+/*
+  called when socket becomes writeable on connect
+*/
+static void ctdb_node_connect_write(struct tevent_context *ev,
+				    struct tevent_fd *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->transport_data,
+						      struct ctdb_tcp_node);
+	struct ctdb_context *ctdb = node->ctdb;
+	int error = 0;
+	socklen_t len = sizeof(error);
+	int one = 1;
+	int ret;
+
+	TALLOC_FREE(tnode->connect_te);
+
+	ret = getsockopt(tnode->out_fd, SOL_SOCKET, SO_ERROR, &error, &len);
+	if (ret != 0 || error != 0) {
+		ctdb_tcp_stop_outgoing(node);
+		tnode->connect_te = tevent_add_timer(ctdb->ev, tnode,
+						    timeval_current_ofs(1, 0),
+						    ctdb_tcp_node_connect, node);
+		return;
+	}
+
+	TALLOC_FREE(tnode->connect_fde);
+
+	ret = setsockopt(tnode->out_fd,
+			 IPPROTO_TCP,
+			 TCP_NODELAY,
+			 (char *)&one,
+			 sizeof(one));
+	if (ret == -1) {
+		DBG_WARNING("Failed to set TCP_NODELAY on fd - %s\n",
+			  strerror(errno));
+	}
+	ret = setsockopt(tnode->out_fd,
+			 SOL_SOCKET,
+			 SO_KEEPALIVE,(char *)&one,
+			 sizeof(one));
+	if (ret == -1) {
+		DBG_WARNING("Failed to set KEEPALIVE on fd - %s\n",
+			    strerror(errno));
+	}
+
+	tnode->out_queue = ctdb_queue_setup(node->ctdb,
+					    tnode,
+					    tnode->out_fd,
+					    CTDB_TCP_ALIGNMENT,
+					    ctdb_tcp_tnode_cb,
+					    node,
+					    "to-node-%s",
+					    node->name);
+	if (tnode->out_queue == NULL) {
+		DBG_ERR("Failed to set up outgoing queue\n");
+		ctdb_tcp_stop_outgoing(node);
+		tnode->connect_te = tevent_add_timer(ctdb->ev,
+						     tnode,
+						     timeval_current_ofs(1, 0),
+						     ctdb_tcp_node_connect,
+						     node);
+		return;
+	}
+
+	/* the queue subsystem now owns this fd */
+	tnode->out_fd = -1;
+
+	/*
+	 * Mark the node to which this connection has been established
+	 * as connected, but only if the corresponding listening
+	 * socket is also connected
+	 */
+	if (tnode->in_queue != NULL) {
+		node->ctdb->upcalls->node_connected(node);
+	}
+}
+
+
+static void ctdb_tcp_node_connect_timeout(struct tevent_context *ev,
+					  struct tevent_timer *te,
+					  struct timeval t,
+					  void *private_data);
+
+/*
+  called when we should try and establish a tcp connection to a node
+*/
+static void ctdb_tcp_start_outgoing(struct ctdb_node *node)
+{
+	struct ctdb_tcp_node *tnode = talloc_get_type(node->transport_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;
+	int ret;
+
+	sock_out = node->address;
+
+	tnode->out_fd = socket(sock_out.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
+	if (tnode->out_fd == -1) {
+		DBG_ERR("Failed to create socket\n");
+		goto failed;
+	}
+
+	ret = set_blocking(tnode->out_fd, false);
+	if (ret != 0) {
+		DBG_ERR("Failed to set socket non-blocking (%s)\n",
+			strerror(errno));
+		goto failed;
+	}
+
+	set_close_on_exec(tnode->out_fd);
+
+	DBG_DEBUG("Created TCP SOCKET FD:%d\n", tnode->out_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.
+	 */
+	sock_in = *ctdb->address;
+
+	/* 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:
+		sock_in.ip.sin_port = 0 /* Any port */;
+		sockin_size = sizeof(sock_in.ip);
+		sockout_size = sizeof(sock_out.ip);
+		break;
+	case AF_INET6:
+		sock_in.ip6.sin6_port = 0 /* Any port */;
+		sockin_size = sizeof(sock_in.ip6);
+		sockout_size = sizeof(sock_out.ip6);
+		break;
+	default:
+		DBG_ERR("Unknown address family %u\n", sock_in.sa.sa_family);
+		/* Can't happen to due to address parsing restrictions */
+		goto failed;
+	}
+
+	ret = bind(tnode->out_fd, (struct sockaddr *)&sock_in, sockin_size);
+	if (ret == -1) {
+		DBG_ERR("Failed to bind socket (%s)\n", strerror(errno));
+		goto failed;
+	}
+
+	ret = connect(tnode->out_fd,
+		      (struct sockaddr *)&sock_out,
+		      sockout_size);
+	if (ret != 0 && errno != EINPROGRESS) {
+		goto failed;
+	}
+
+	/* non-blocking connect - wait for write event */
+	tnode->connect_fde = tevent_add_fd(node->ctdb->ev,
+					   tnode,
+					   tnode->out_fd,
+					   TEVENT_FD_WRITE|TEVENT_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 = tevent_add_timer(ctdb->ev,
+					     tnode,
+					     timeval_current_ofs(1, 0),
+					     ctdb_tcp_node_connect_timeout,
+					     node);
+
+	return;
+
+failed:
+	ctdb_tcp_stop_outgoing(node);
+	tnode->connect_te = tevent_add_timer(ctdb->ev,
+					     tnode,
+					     timeval_current_ofs(1, 0),
+					     ctdb_tcp_node_connect,
+					     node);
+}
+
+void ctdb_tcp_node_connect(struct tevent_context *ev,
+			   struct tevent_timer *te,
+			   struct timeval t,
+			   void *private_data)
+{
+	struct ctdb_node *node = talloc_get_type_abort(private_data,
+						       struct ctdb_node);
+
+	ctdb_tcp_start_outgoing(node);
+}
+
+static void ctdb_tcp_node_connect_timeout(struct tevent_context *ev,
+					  struct tevent_timer *te,
+					  struct timeval t,
+					  void *private_data)
+{
+	struct ctdb_node *node = talloc_get_type_abort(private_data,
+						       struct ctdb_node);
+
+	ctdb_tcp_stop_outgoing(node);
+	ctdb_tcp_start_outgoing(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 tevent_context *ev, struct tevent_fd *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->transport_data,
+						struct ctdb_tcp);
+	ctdb_sock_addr addr;
+	socklen_t len;
+	int fd;
+	struct ctdb_node *node;
+	struct ctdb_tcp_node *tnode;
+	int one = 1;
+	int ret;
+
+	memset(&addr, 0, sizeof(addr));
+	len = sizeof(addr);
+	fd = accept(ctcp->listen_fd, (struct sockaddr *)&addr, &len);
+	if (fd == -1) return;
+	smb_set_close_on_exec(fd);
+
+	node = ctdb_ip_to_node(ctdb, &addr);
+	if (node == NULL) {
+		D_ERR("Refused connection from unknown node %s\n",
+		      ctdb_addr_to_str(&addr));
+		close(fd);
+		return;
+	}
+
+	tnode = talloc_get_type_abort(node->transport_data,
+				      struct ctdb_tcp_node);
+	if (tnode == NULL) {
+		/* This can't happen - see ctdb_tcp_initialise() */
+		DBG_ERR("INTERNAL ERROR setting up connection from node %s\n",
+			ctdb_addr_to_str(&addr));
+		close(fd);
+		return;
+	}
+
+	if (tnode->in_queue != NULL) {
+		DBG_ERR("Incoming queue active, rejecting connection from %s\n",
+			ctdb_addr_to_str(&addr));
+		close(fd);
+		return;
+	}
+
+	ret = set_blocking(fd, false);
+	if (ret != 0) {
+		DBG_ERR("Failed to set socket non-blocking (%s)\n",
+			strerror(errno));
+		close(fd);
+		return;
+	}
+
+	set_close_on_exec(fd);
+
+	DBG_DEBUG("Created SOCKET FD:%d to incoming ctdb connection\n", fd);
+
+	ret = setsockopt(fd,
+			 SOL_SOCKET,
+			 SO_KEEPALIVE,
+			 (char *)&one,
+			 sizeof(one));
+	if (ret == -1) {
+		DBG_WARNING("Failed to set KEEPALIVE on fd - %s\n",
+			    strerror(errno));
+	}
+
+	tnode->in_queue = ctdb_queue_setup(ctdb,
+					   tnode,
+					   fd,
+					   CTDB_TCP_ALIGNMENT,
+					   ctdb_tcp_read_cb,
+					   node,
+					   "ctdbd-%s",
+					   ctdb_addr_to_str(&addr));
+	if (tnode->in_queue == NULL) {
+		DBG_ERR("Failed to set up incoming queue\n");
+		close(fd);
+		return;
+	}
+
+       /*
+	* Mark the connecting node as connected, but only if the
+	* corresponding outbound connected is also up
+	*/
+	if (tnode->out_queue != NULL) {
+		node->ctdb->upcalls->node_connected(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->transport_data,
+						struct ctdb_tcp);
+        ctdb_sock_addr sock;
+	int lock_fd;
+	unsigned int i;
+	const char *lock_path = CTDB_RUNDIR "/.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;
+		}
+		sock = ctdb->nodes[i]->address;
+
+		switch (sock.sa.sa_family) {
+		case AF_INET:
+			sock_size = sizeof(sock.ip);
+			break;
+		case AF_INET6:
+			sock_size = sizeof(sock.ip6);
+			break;
+		default:
+			DEBUG(DEBUG_ERR, (__location__ " unknown family %u\n",
+				sock.sa.sa_family));
+			continue;
+		}
+
+		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);
+
+	        if (setsockopt(ctcp->listen_fd,SOL_SOCKET,SO_REUSEADDR,
+			       (char *)&one,sizeof(one)) == -1) {
+			DEBUG(DEBUG_WARNING, ("Failed to set REUSEADDR on fd - %s\n",
+					      strerror(errno)));
+		}
+
+		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));
+		}
+
+		close(ctcp->listen_fd);
+		ctcp->listen_fd = -1;
+	}
+
+	if (i == ctdb->num_nodes) {
+		DEBUG(DEBUG_CRIT,("Unable to bind to any of the node addresses - giving up\n"));
+		goto failed;
+	}
+	ctdb->address = talloc_memdup(ctdb,
+				      &ctdb->nodes[i]->address,
+				      sizeof(ctdb_sock_addr));
+	if (ctdb->address == NULL) {
+		ctdb_set_error(ctdb, "Out of memory at %s:%d",
+			       __FILE__, __LINE__);
+		goto failed;
+	}
+
+	ctdb->name = talloc_asprintf(ctdb, "%s:%u",
+				     ctdb_addr_to_str(ctdb->address),
+				     ctdb_addr_to_port(ctdb->address));
+	if (ctdb->name == NULL) {
+		ctdb_set_error(ctdb, "Out of memory at %s:%d",
+			       __FILE__, __LINE__);
+		goto failed;
+	}
+	DEBUG(DEBUG_INFO,("ctdb chose network address %s\n", ctdb->name));
+
+	if (listen(ctcp->listen_fd, 10) == -1) {
+		goto failed;
+	}
+
+	fde = tevent_add_fd(ctdb->ev, ctcp, ctcp->listen_fd, TEVENT_FD_READ,
+			    ctdb_listen_event, ctdb);
+	tevent_fd_set_auto_close(fde);
+
+	close(lock_fd);
+
+	return 0;
+
+failed:
+	close(lock_fd);
+	if (ctcp->listen_fd != -1) {
+		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->transport_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) {
+		return ctdb_tcp_listen_automatic(ctdb);
+	}
+
+	sock = *ctdb->address;
+
+	switch (sock.sa.sa_family) {
+	case AF_INET:
+		sock_size = sizeof(sock.ip);
+		break;
+	case AF_INET6:
+		sock_size = sizeof(sock.ip6);
+		break;
+	default:
+		DEBUG(DEBUG_ERR, (__location__ " unknown family %u\n",
+			sock.sa.sa_family));
+		goto failed;
+	}
+
+	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);
+
+        if (setsockopt(ctcp->listen_fd,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one)) == -1) {
+		DEBUG(DEBUG_WARNING, ("Failed to set REUSEADDR on fd - %s\n",
+				      strerror(errno)));
+	}
+
+	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 = tevent_add_fd(ctdb->ev, ctcp, ctcp->listen_fd, TEVENT_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;
+}
+