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/* $OpenBSD: check_tcp.c,v 1.2 2006/12/16 12:42:14 reyk Exp $ */
/*
* Copyright (c) 2006 Pierre-Yves Ritschard <pyr@spootnik.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <net/if.h>
#include <limits.h>
#include <event.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "hostated.h"
int
check_tcp(struct host *host, struct table *table)
{
int sock;
if ((sock = tcp_connect(host, table)) <= 0)
return (sock);
close(sock);
return (HOST_UP);
}
int
tcp_connect(struct host *host, struct table *table)
{
int s;
socklen_t len;
struct timeval tv;
struct sockaddr sa;
fd_set fdset;
switch (host->ss.ss_family) {
case AF_INET:
((struct sockaddr_in *)&host->ss)->sin_port =
htons(table->port);
break;
case AF_INET6:
((struct sockaddr_in6 *)&host->ss)->sin6_port =
htons(table->port);
break;
}
len = ((struct sockaddr *)&host->ss)->sa_len;
if ((s = socket(host->ss.ss_family, SOCK_STREAM, 0)) == -1)
fatal("check_tcp: cannot create socket");
if (fcntl(s, F_SETFL, O_NONBLOCK) == -1)
fatal("check_tcp: cannot set non blocking socket");
if (connect(s, (struct sockaddr *)&host->ss, len) == -1) {
if (errno != EINPROGRESS && errno != EWOULDBLOCK) {
close(s);
return (HOST_DOWN);
}
} else
return (s);
tv.tv_sec = table->timeout / 1000;
tv.tv_usec = table->timeout % 1000;
FD_ZERO(&fdset);
FD_SET(s, &fdset);
/* XXX This needs to be rewritten */
switch (select(s + 1, NULL, &fdset, NULL, &tv)) {
case -1:
if (errno != EINTR)
fatal("check_tcp: select");
else
return (HOST_UNKNOWN);
case 0:
close(s);
return (HOST_DOWN);
default:
if (getpeername(s, &sa, &len) == -1) {
if (errno == ENOTCONN) {
close(s);
return (HOST_DOWN);
} else {
log_debug("check_tcp: unknown peername");
close(s);
return (HOST_UNKNOWN);
}
} else
return (s);
}
return (HOST_UNKNOWN);
}
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