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4647787773
This groups function prototypes for common client/server functions in common/common.h and removes them from ctdb_private.h. Signed-off-by: Amitay Isaacs <amitay@gmail.com> Reviewed-by: Martin Schwenke <martin@meltin.net>
473 lines
13 KiB
C
473 lines
13 KiB
C
/*
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ctdb over TCP
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Copyright (C) Andrew Tridgell 2006
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Copyright (C) Ronnie Sahlberg 2008
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "replace.h"
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#include "system/network.h"
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#include "system/filesys.h"
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#include <talloc.h>
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#include <tevent.h>
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#include "lib/util/debug.h"
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#include "lib/util/time.h"
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#include "ctdb_logging.h"
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#include "ctdb_private.h"
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#include "common/system.h"
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#include "common/common.h"
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#include "ctdb_tcp.h"
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/*
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stop any connecting (established or pending) to a node
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*/
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void ctdb_tcp_stop_connection(struct ctdb_node *node)
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{
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struct ctdb_tcp_node *tnode = talloc_get_type(
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node->private_data, struct ctdb_tcp_node);
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ctdb_queue_set_fd(tnode->out_queue, -1);
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talloc_free(tnode->connect_te);
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talloc_free(tnode->connect_fde);
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tnode->connect_fde = NULL;
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tnode->connect_te = NULL;
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if (tnode->fd != -1) {
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close(tnode->fd);
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tnode->fd = -1;
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}
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}
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/*
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called when a complete packet has come in - should not happen on this socket
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unless the other side closes the connection with RST or FIN
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*/
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void ctdb_tcp_tnode_cb(uint8_t *data, size_t cnt, void *private_data)
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{
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struct ctdb_node *node = talloc_get_type(private_data, struct ctdb_node);
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struct ctdb_tcp_node *tnode = talloc_get_type(
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node->private_data, struct ctdb_tcp_node);
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if (data == NULL) {
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node->ctdb->upcalls->node_dead(node);
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}
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ctdb_tcp_stop_connection(node);
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tnode->connect_te = tevent_add_timer(node->ctdb->ev, tnode,
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timeval_current_ofs(3, 0),
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ctdb_tcp_node_connect, node);
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}
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/*
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called when socket becomes writeable on connect
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*/
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static void ctdb_node_connect_write(struct tevent_context *ev,
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struct tevent_fd *fde,
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uint16_t flags, void *private_data)
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{
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struct ctdb_node *node = talloc_get_type(private_data,
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struct ctdb_node);
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struct ctdb_tcp_node *tnode = talloc_get_type(node->private_data,
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struct ctdb_tcp_node);
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struct ctdb_context *ctdb = node->ctdb;
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int error = 0;
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socklen_t len = sizeof(error);
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int one = 1;
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talloc_free(tnode->connect_te);
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tnode->connect_te = NULL;
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if (getsockopt(tnode->fd, SOL_SOCKET, SO_ERROR, &error, &len) != 0 ||
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error != 0) {
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ctdb_tcp_stop_connection(node);
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tnode->connect_te = tevent_add_timer(ctdb->ev, tnode,
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timeval_current_ofs(1, 0),
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ctdb_tcp_node_connect, node);
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return;
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}
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talloc_free(tnode->connect_fde);
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tnode->connect_fde = NULL;
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if (setsockopt(tnode->fd,IPPROTO_TCP,TCP_NODELAY,(char *)&one,sizeof(one)) == -1) {
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DEBUG(DEBUG_WARNING, ("Failed to set TCP_NODELAY on fd - %s\n",
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strerror(errno)));
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}
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if (setsockopt(tnode->fd,SOL_SOCKET,SO_KEEPALIVE,(char *)&one,sizeof(one)) == -1) {
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DEBUG(DEBUG_WARNING, ("Failed to set KEEPALIVE on fd - %s\n",
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strerror(errno)));
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}
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ctdb_queue_set_fd(tnode->out_queue, tnode->fd);
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/* the queue subsystem now owns this fd */
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tnode->fd = -1;
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}
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/*
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called when we should try and establish a tcp connection to a node
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*/
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void ctdb_tcp_node_connect(struct tevent_context *ev, struct tevent_timer *te,
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struct timeval t, void *private_data)
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{
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struct ctdb_node *node = talloc_get_type(private_data,
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struct ctdb_node);
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struct ctdb_tcp_node *tnode = talloc_get_type(node->private_data,
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struct ctdb_tcp_node);
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struct ctdb_context *ctdb = node->ctdb;
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ctdb_sock_addr sock_in;
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int sockin_size;
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int sockout_size;
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ctdb_sock_addr sock_out;
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ctdb_tcp_stop_connection(node);
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sock_out = node->address;
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tnode->fd = socket(sock_out.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
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if (tnode->fd == -1) {
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DEBUG(DEBUG_ERR, (__location__ "Failed to create socket\n"));
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return;
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}
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set_nonblocking(tnode->fd);
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set_close_on_exec(tnode->fd);
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DEBUG(DEBUG_DEBUG, (__location__ " Created TCP SOCKET FD:%d\n", tnode->fd));
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/* Bind our side of the socketpair to the same address we use to listen
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* on incoming CTDB traffic.
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* We must specify this address to make sure that the address we expose to
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* the remote side is actually routable in case CTDB traffic will run on
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* a dedicated non-routeable network.
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*/
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sock_in = *ctdb->address;
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/* AIX libs check to see if the socket address and length
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arguments are consistent with each other on calls like
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connect(). Can not get by with just sizeof(sock_in),
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need sizeof(sock_in.ip).
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*/
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switch (sock_in.sa.sa_family) {
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case AF_INET:
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sock_in.ip.sin_port = 0 /* Any port */;
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sockin_size = sizeof(sock_in.ip);
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sockout_size = sizeof(sock_out.ip);
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break;
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case AF_INET6:
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sock_in.ip6.sin6_port = 0 /* Any port */;
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sockin_size = sizeof(sock_in.ip6);
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sockout_size = sizeof(sock_out.ip6);
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break;
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default:
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DEBUG(DEBUG_ERR, (__location__ " unknown family %u\n",
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sock_in.sa.sa_family));
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close(tnode->fd);
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return;
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}
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if (bind(tnode->fd, (struct sockaddr *)&sock_in, sockin_size) == -1) {
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DEBUG(DEBUG_ERR, (__location__ "Failed to bind socket %s(%d)\n",
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strerror(errno), errno));
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close(tnode->fd);
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return;
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}
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if (connect(tnode->fd, (struct sockaddr *)&sock_out, sockout_size) != 0 &&
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errno != EINPROGRESS) {
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ctdb_tcp_stop_connection(node);
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tnode->connect_te = tevent_add_timer(ctdb->ev, tnode,
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timeval_current_ofs(1, 0),
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ctdb_tcp_node_connect, node);
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return;
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}
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/* non-blocking connect - wait for write event */
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tnode->connect_fde = tevent_add_fd(node->ctdb->ev, tnode, tnode->fd,
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TEVENT_FD_WRITE|TEVENT_FD_READ,
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ctdb_node_connect_write, node);
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/* don't give it long to connect - retry in one second. This ensures
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that we find a node is up quickly (tcp normally backs off a syn reply
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delay by quite a lot) */
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tnode->connect_te = tevent_add_timer(ctdb->ev, tnode,
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timeval_current_ofs(1, 0),
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ctdb_tcp_node_connect, node);
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}
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/*
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called when we get contacted by another node
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currently makes no attempt to check if the connection is really from a ctdb
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node in our cluster
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*/
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static void ctdb_listen_event(struct tevent_context *ev, struct tevent_fd *fde,
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uint16_t flags, void *private_data)
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{
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struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
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struct ctdb_tcp *ctcp = talloc_get_type(ctdb->private_data, struct ctdb_tcp);
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ctdb_sock_addr addr;
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socklen_t len;
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int fd, nodeid;
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struct ctdb_incoming *in;
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int one = 1;
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memset(&addr, 0, sizeof(addr));
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len = sizeof(addr);
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fd = accept(ctcp->listen_fd, (struct sockaddr *)&addr, &len);
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if (fd == -1) return;
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nodeid = ctdb_ip_to_nodeid(ctdb, &addr);
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if (nodeid == -1) {
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DEBUG(DEBUG_ERR, ("Refused connection from unknown node %s\n", ctdb_addr_to_str(&addr)));
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close(fd);
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return;
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}
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in = talloc_zero(ctcp, struct ctdb_incoming);
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in->fd = fd;
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in->ctdb = ctdb;
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set_nonblocking(in->fd);
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set_close_on_exec(in->fd);
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DEBUG(DEBUG_DEBUG, (__location__ " Created SOCKET FD:%d to incoming ctdb connection\n", fd));
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if (setsockopt(in->fd,SOL_SOCKET,SO_KEEPALIVE,(char *)&one,sizeof(one)) == -1) {
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DEBUG(DEBUG_WARNING, ("Failed to set KEEPALIVE on fd - %s\n",
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strerror(errno)));
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}
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in->queue = ctdb_queue_setup(ctdb, in, in->fd, CTDB_TCP_ALIGNMENT,
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ctdb_tcp_read_cb, in, "ctdbd-%s", ctdb_addr_to_str(&addr));
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}
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/*
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automatically find which address to listen on
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*/
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static int ctdb_tcp_listen_automatic(struct ctdb_context *ctdb)
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{
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struct ctdb_tcp *ctcp = talloc_get_type(ctdb->private_data,
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struct ctdb_tcp);
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ctdb_sock_addr sock;
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int lock_fd, i;
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const char *lock_path = CTDB_RUNDIR "/.socket_lock";
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struct flock lock;
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int one = 1;
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int sock_size;
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struct tevent_fd *fde;
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/* If there are no nodes, then it won't be possible to find
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* the first one. Log a failure and short circuit the whole
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* process.
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*/
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if (ctdb->num_nodes == 0) {
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DEBUG(DEBUG_CRIT,("No nodes available to attempt bind to - is the nodes file empty?\n"));
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return -1;
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}
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/* in order to ensure that we don't get two nodes with the
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same adddress, we must make the bind() and listen() calls
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atomic. The SO_REUSEADDR setsockopt only prevents double
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binds if the first socket is in LISTEN state */
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lock_fd = open(lock_path, O_RDWR|O_CREAT, 0666);
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if (lock_fd == -1) {
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DEBUG(DEBUG_CRIT,("Unable to open %s\n", lock_path));
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return -1;
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}
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lock.l_type = F_WRLCK;
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lock.l_whence = SEEK_SET;
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lock.l_start = 0;
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lock.l_len = 1;
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lock.l_pid = 0;
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if (fcntl(lock_fd, F_SETLKW, &lock) != 0) {
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DEBUG(DEBUG_CRIT,("Unable to lock %s\n", lock_path));
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close(lock_fd);
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return -1;
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}
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for (i=0; i < ctdb->num_nodes; i++) {
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if (ctdb->nodes[i]->flags & NODE_FLAGS_DELETED) {
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continue;
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}
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sock = ctdb->nodes[i]->address;
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switch (sock.sa.sa_family) {
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case AF_INET:
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sock_size = sizeof(sock.ip);
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break;
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case AF_INET6:
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sock_size = sizeof(sock.ip6);
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break;
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default:
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DEBUG(DEBUG_ERR, (__location__ " unknown family %u\n",
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sock.sa.sa_family));
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continue;
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}
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ctcp->listen_fd = socket(sock.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
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if (ctcp->listen_fd == -1) {
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ctdb_set_error(ctdb, "socket failed\n");
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continue;
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}
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set_close_on_exec(ctcp->listen_fd);
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if (setsockopt(ctcp->listen_fd,SOL_SOCKET,SO_REUSEADDR,
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(char *)&one,sizeof(one)) == -1) {
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DEBUG(DEBUG_WARNING, ("Failed to set REUSEADDR on fd - %s\n",
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strerror(errno)));
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}
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if (bind(ctcp->listen_fd, (struct sockaddr * )&sock, sock_size) == 0) {
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break;
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}
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if (errno == EADDRNOTAVAIL) {
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DEBUG(DEBUG_DEBUG,(__location__ " Failed to bind() to socket. %s(%d)\n",
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strerror(errno), errno));
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} else {
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DEBUG(DEBUG_ERR,(__location__ " Failed to bind() to socket. %s(%d)\n",
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strerror(errno), errno));
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}
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close(ctcp->listen_fd);
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ctcp->listen_fd = -1;
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}
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if (i == ctdb->num_nodes) {
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DEBUG(DEBUG_CRIT,("Unable to bind to any of the node addresses - giving up\n"));
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goto failed;
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}
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ctdb->address = talloc_memdup(ctdb,
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&ctdb->nodes[i]->address,
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sizeof(ctdb_sock_addr));
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if (ctdb->address == NULL) {
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ctdb_set_error(ctdb, "Out of memory at %s:%d",
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__FILE__, __LINE__);
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goto failed;
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}
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ctdb->name = talloc_asprintf(ctdb, "%s:%u",
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ctdb_addr_to_str(ctdb->address),
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ctdb_addr_to_port(ctdb->address));
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if (ctdb->name == NULL) {
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ctdb_set_error(ctdb, "Out of memory at %s:%d",
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__FILE__, __LINE__);
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goto failed;
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}
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DEBUG(DEBUG_INFO,("ctdb chose network address %s\n", ctdb->name));
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if (listen(ctcp->listen_fd, 10) == -1) {
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goto failed;
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}
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fde = tevent_add_fd(ctdb->ev, ctcp, ctcp->listen_fd, TEVENT_FD_READ,
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ctdb_listen_event, ctdb);
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tevent_fd_set_auto_close(fde);
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close(lock_fd);
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return 0;
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failed:
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close(lock_fd);
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if (ctcp->listen_fd != -1) {
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close(ctcp->listen_fd);
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ctcp->listen_fd = -1;
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}
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return -1;
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}
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/*
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listen on our own address
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*/
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int ctdb_tcp_listen(struct ctdb_context *ctdb)
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{
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struct ctdb_tcp *ctcp = talloc_get_type(ctdb->private_data,
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struct ctdb_tcp);
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ctdb_sock_addr sock;
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int sock_size;
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int one = 1;
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struct tevent_fd *fde;
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/* we can either auto-bind to the first available address, or we can
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use a specified address */
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if (!ctdb->address) {
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return ctdb_tcp_listen_automatic(ctdb);
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}
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sock = *ctdb->address;
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switch (sock.sa.sa_family) {
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case AF_INET:
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sock_size = sizeof(sock.ip);
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break;
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case AF_INET6:
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sock_size = sizeof(sock.ip6);
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break;
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default:
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DEBUG(DEBUG_ERR, (__location__ " unknown family %u\n",
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sock.sa.sa_family));
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goto failed;
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}
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ctcp->listen_fd = socket(sock.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
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if (ctcp->listen_fd == -1) {
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ctdb_set_error(ctdb, "socket failed\n");
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return -1;
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}
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set_close_on_exec(ctcp->listen_fd);
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if (setsockopt(ctcp->listen_fd,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one)) == -1) {
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DEBUG(DEBUG_WARNING, ("Failed to set REUSEADDR on fd - %s\n",
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strerror(errno)));
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}
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if (bind(ctcp->listen_fd, (struct sockaddr * )&sock, sock_size) != 0) {
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DEBUG(DEBUG_ERR,(__location__ " Failed to bind() to socket. %s(%d)\n", strerror(errno), errno));
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goto failed;
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}
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if (listen(ctcp->listen_fd, 10) == -1) {
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goto failed;
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}
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fde = tevent_add_fd(ctdb->ev, ctcp, ctcp->listen_fd, TEVENT_FD_READ,
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ctdb_listen_event, ctdb);
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tevent_fd_set_auto_close(fde);
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return 0;
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failed:
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if (ctcp->listen_fd != -1) {
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close(ctcp->listen_fd);
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}
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ctcp->listen_fd = -1;
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return -1;
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}
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