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/*
* Soft: Keepalived is a failover program for the LVS project
* <www.linuxvirtualserver.org>. It monitor & manipulate
* a loadbalanced server pool using multi-layer checks.
*
* Part: TCP checker.
*
* Version: $Id: check_tcp.c,v 1.1.17 2009/03/05 01:31:12 acassen Exp $
*
* Author: Alexandre Cassen, <acassen@linux-vs.org>
*
* 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.
*
* 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
* 2 of the License, or (at your option) any later version.
*
* Copyright (C) 2001-2009 Alexandre Cassen, <acassen@freebox.fr>
*/
#include "check_tcp.h"
#include "check_api.h"
#include "memory.h"
#include "ipwrapper.h"
#include "layer4.h"
#include "logger.h"
#include "smtp.h"
#include "utils.h"
#include "parser.h"
int tcp_connect_thread(thread *);
/* Configuration stream handling */
void
free_tcp_check(void *data)
{
tcp_checker *tcp_chk = CHECKER_DATA(data);
FREE(tcp_chk);
FREE(data);
}
void
dump_tcp_check(void *data)
{
tcp_checker *tcp_chk = CHECKER_DATA(data);
log_message(LOG_INFO, " Keepalive method = TCP_CHECK");
if (tcp_chk->connection_port)
log_message(LOG_INFO, " Connection port = %d",
ntohs(tcp_chk->connection_port));
if (tcp_chk->bindto)
log_message(LOG_INFO, " Bind to = %s", inet_ntop2(tcp_chk->bindto));
log_message(LOG_INFO, " Connection timeout = %d", tcp_chk->connection_to/TIMER_HZ);
}
void
tcp_check_handler(vector strvec)
{
tcp_checker *tcp_chk = (tcp_checker *) MALLOC(sizeof (tcp_checker));
/* queue new checker */
queue_checker(free_tcp_check, dump_tcp_check, tcp_connect_thread,
tcp_chk);
}
void
connect_port_handler(vector strvec)
{
tcp_checker *tcp_chk = CHECKER_GET();
tcp_chk->connection_port = htons(CHECKER_VALUE_INT(strvec));
}
void
bind_handler(vector strvec)
{
tcp_checker *tcp_chk = CHECKER_GET();
inet_ston(VECTOR_SLOT(strvec, 1), &tcp_chk->bindto);
}
void
connect_timeout_handler(vector strvec)
{
tcp_checker *tcp_chk = CHECKER_GET();
tcp_chk->connection_to = CHECKER_VALUE_INT(strvec) * TIMER_HZ;
}
void
install_tcp_check_keyword(void)
{
install_keyword("TCP_CHECK", &tcp_check_handler);
install_sublevel();
install_keyword("connect_port", &connect_port_handler);
install_keyword("bindto", &bind_handler);
install_keyword("connect_timeout", &connect_timeout_handler);
install_sublevel_end();
}
int
tcp_check_thread(thread * thread_obj)
{
checker *checker_obj;
tcp_checker *tcp_check;
uint16_t addr_port;
int status;
checker_obj = THREAD_ARG(thread_obj);
tcp_check = CHECKER_ARG(checker_obj);
addr_port = CHECKER_RPORT(checker_obj);
if (tcp_check->connection_port)
addr_port = tcp_check->connection_port;
status = tcp_socket_state(thread_obj->u.fd, thread_obj, CHECKER_RIP(checker_obj)
, addr_port, tcp_check_thread);
/* If status = connect_success, TCP connection to remote host is established.
* Otherwise we have a real connection error or connection timeout.
*/
if (status == connect_success) {
close(thread_obj->u.fd);
if (!svr_checker_up(checker_obj->id, checker_obj->rs)) {
log_message(LOG_INFO, "TCP connection to [%s:%d] success.",
inet_ntop2(CHECKER_RIP(checker_obj))
, ntohs(addr_port));
smtp_alert(checker_obj->rs, NULL, NULL,
"UP",
"=> TCP CHECK succeed on service <=");
update_svr_checker_state(UP, checker_obj->id
, checker_obj->vs
, checker_obj->rs);
}
} else {
if (svr_checker_up(checker_obj->id, checker_obj->rs)) {
log_message(LOG_INFO, "TCP connection to [%s:%d] failed !!!",
inet_ntop2(CHECKER_RIP(checker_obj))
, ntohs(addr_port));
smtp_alert(checker_obj->rs, NULL, NULL,
"DOWN",
"=> TCP CHECK failed on service <=");
update_svr_checker_state(DOWN, checker_obj->id
, checker_obj->vs
, checker_obj->rs);
}
}
/* Register next timer checker */
if (status != connect_in_progress)
thread_add_timer(thread_obj->master, tcp_connect_thread, checker_obj,
checker_obj->vs->delay_loop);
return 0;
}
int
tcp_connect_thread(thread * thread_obj)
{
checker *checker_obj = THREAD_ARG(thread_obj);
tcp_checker *tcp_check = CHECKER_ARG(checker_obj);
int fd;
uint16_t addr_port;
int status;
/*
* Register a new checker thread & return
* if checker is disabled
*/
if (!CHECKER_ENABLED(checker_obj)) {
thread_add_timer(thread_obj->master, tcp_connect_thread, checker_obj,
checker_obj->vs->delay_loop);
return 0;
}
if ((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
DBG("TCP connect fail to create socket.");
return 0;
}
addr_port = CHECKER_RPORT(checker_obj);
if (tcp_check->connection_port)
addr_port = tcp_check->connection_port;
status = tcp_bind_connect(fd, CHECKER_RIP(checker_obj), addr_port
, tcp_check->bindto);
/* handle tcp connection status & register check worker thread */
tcp_connection_state(fd, status, thread_obj, tcp_check_thread,
tcp_check->connection_to);
return 0;
}
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