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/* $OpenBSD: check_icmp.c,v 1.2 2006/12/16 11:59:12 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_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/icmp6.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <limits.h>
#include <event.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include "hostated.h"
int check_icmp6(struct host *, int, int);
int check_icmp4(struct host *, int, int);
int in_cksum(u_short *, int);
int check_icmp(struct host *host, int s, int s6, int timeout)
{
if (host->ss.ss_family == AF_INET)
return (check_icmp4(host, s, timeout));
else
return (check_icmp6(host, s6, timeout));
}
int check_icmp6(struct host *host, int s, int timeout)
{
struct sockaddr *to;
struct icmp6_hdr *icp;
int ident;
ssize_t i;
int cc;
int datalen = (64 - 8);
u_char packet[datalen];
fd_set fdset;
socklen_t len;
struct timeval tv;
to = (struct sockaddr *)&host->ss;
ident = getpid() & 0xFFFF;
len = sizeof(struct sockaddr_in6);
bzero(&packet, sizeof(packet));
icp = (struct icmp6_hdr *)packet;
icp->icmp6_type = ICMP6_ECHO_REQUEST;
icp->icmp6_code = 0;
icp->icmp6_seq = 1;
icp->icmp6_id = ident;
memset((packet + sizeof(*icp)), 'X', datalen);
cc = datalen + 8;
i = sendto(s, packet, cc, 0, to, len);
if (i < 0 || i != cc) {
log_warn("check_icmp6: cannot send ping");
return (HOST_UNKNOWN);
}
tv.tv_sec = timeout / 1000;
tv.tv_usec = timeout % 1000;
FD_ZERO(&fdset);
FD_SET(s, &fdset);
switch (select(s + 1, &fdset, NULL, NULL, &tv)) {
case -1:
if (errno == EINTR) {
log_warnx("check_icmp6: interrupted");
return (HOST_UNKNOWN);
} else
fatal("check_icmp6: select");
case 0:
log_debug("check_icmp6: timeout");
return (HOST_DOWN);
default:
bzero(&packet, sizeof(packet));
i = recvfrom(s, packet, cc, 0, to, &len);
if (i < 0 || i != cc) {
log_warn("check_icmp6: did not receive valid ping");
return (HOST_DOWN);
}
icp = (struct icmp6_hdr *)(packet);
if (icp->icmp6_id != ident) {
log_warnx("check_icmp6: did not receive valid ident");
return (HOST_DOWN);
}
break;
}
return (HOST_UP);
}
int check_icmp4(struct host *host, int s, int timeout)
{
struct sockaddr *to;
struct icmp *icp;
int ident;
ssize_t i;
int cc;
int datalen = (64 - 8);
u_char packet[datalen];
fd_set fdset;
socklen_t len;
struct timeval tv;
to = (struct sockaddr *)&host->ss;
ident = getpid() & 0xFFFF;
len = sizeof(struct sockaddr_in);
bzero(&packet, sizeof(packet));
icp = (struct icmp *)packet;
icp->icmp_type = htons(ICMP_ECHO);
icp->icmp_code = 0;
icp->icmp_seq = htons(1);
icp->icmp_id = htons(ident);
icp->icmp_cksum = 0;
memset(icp->icmp_data, 'X', datalen);
cc = datalen + 8;
icp->icmp_cksum = in_cksum((u_short *)icp, cc);
i = sendto(s, packet, cc, 0, to, len);
if (i < 0 || i != cc) {
log_warn("check_icmp4: cannot send ping");
return (HOST_UNKNOWN);
}
tv.tv_sec = timeout / 1000;
tv.tv_usec = timeout % 1000;
FD_ZERO(&fdset);
FD_SET(s, &fdset);
switch (select(s + 1, &fdset, NULL, NULL, &tv)) {
case -1:
if (errno == EINTR) {
log_warnx("check_icmp4: ping interrupted");
return (HOST_UNKNOWN);
} else
fatal("check_icmp4: select");
case 0:
log_debug("check_icmp4: timeout");
return (HOST_DOWN);
default:
bzero(&packet, sizeof(packet));
i = recvfrom(s, packet, cc, 0, to, &len);
if (i < 0 || i != cc) {
log_warn("check_icmp4: did not receive valid ping");
return (HOST_DOWN);
}
icp = (struct icmp *)(packet + sizeof(struct ip));
if (ntohs(icp->icmp_id) != ident) {
log_warnx("check_icmp4: did not receive valid ident");
return (HOST_DOWN);
}
break;
}
return (HOST_UP);
}
/* in_cksum from ping.c --
* Checksum routine for Internet Protocol family headers (C Version)
*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Mike Muuss.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
int
in_cksum(u_short *addr, int len)
{
int nleft = len;
u_short *w = addr;
int sum = 0;
u_short answer = 0;
/*
* Our algorithm is simple, using a 32 bit accumulator (sum), we add
* sequential 16 bit words to it, and at the end, fold back all the
* carry bits from the top 16 bits into the lower 16 bits.
*/
while (nleft > 1) {
sum += *w++;
nleft -= 2;
}
/* mop up an odd byte, if necessary */
if (nleft == 1) {
*(u_char *)(&answer) = *(u_char *)w ;
sum += answer;
}
/* add back carry outs from top 16 bits to low 16 bits */
sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
sum += (sum >> 16); /* add carry */
answer = ~sum; /* truncate to 16 bits */
return (answer);
}
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