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ping.c
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/*
ex: set tabstop=4 shiftwidth=4 autoindent:
+-------------------------------------------------------------------------+
| Copyright (C) 2004-2019 The Cacti Group |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301, USA |
| |
+-------------------------------------------------------------------------+
| spine: a backend data gatherer for cacti |
+-------------------------------------------------------------------------+
| This poller would not have been possible without: |
| - Larry Adams (current development and enhancements) |
| - Rivo Nurges (rrd support, mysql poller cache, misc functions) |
| - RTG (core poller code, pthreads, snmp, autoconf examples) |
| - Brady Alleman/Doug Warner (threading ideas, implimentation details) |
+-------------------------------------------------------------------------+
| - Cacti - http://www.cacti.net/ |
+-------------------------------------------------------------------------+
*/
#include "common.h"
#include "spine.h"
/*! \fn int ping_host(host_t *host, ping_t *ping)
* \brief ping a host to determine if it is reachable for polling
* \param host a pointer to the current host structure
* \param ping a pointer to the current hosts ping structure
*
* This function pings a host using the method specified within the system
* configuration and then returns the host status to the calling function.
*
* \return HOST_UP if the host is reachable, HOST_DOWN otherwise.
*/
int ping_host(host_t *host, ping_t *ping) {
int ping_result;
int snmp_result;
/* snmp pinging has been selected at a minimum */
ping_result = 0;
snmp_result = 0;
/* icmp/tcp/udp ping test */
if ((host->availability_method == AVAIL_SNMP_AND_PING) ||
(host->availability_method == AVAIL_PING) ||
(host->availability_method == AVAIL_SNMP_OR_PING)) {
if (host->ping_method == PING_ICMP) {
if (set.icmp_avail == FALSE) {
SPINE_LOG(("Device[%i] DEBUG Falling back to UDP Ping Due to SetUID Issues", host->id));
host->ping_method = PING_UDP;
}
}
if (!strstr(host->hostname, "localhost")) {
if (host->ping_method == PING_ICMP) {
ping_result = ping_icmp(host, ping);
} else if (host->ping_method == PING_UDP) {
ping_result = ping_udp(host, ping);
} else if (host->ping_method == PING_TCP) {
ping_result = ping_tcp(host, ping);
}
} else {
snprintf(ping->ping_status, 50, "0.000");
snprintf(ping->ping_response, SMALL_BUFSIZE, "PING: Device does not require ping");
ping_result = HOST_UP;
}
}
/* snmp test */
if ((host->availability_method == AVAIL_SNMP) ||
(host->availability_method == AVAIL_SNMP_GET_SYSDESC) ||
(host->availability_method == AVAIL_SNMP_GET_NEXT) ||
(host->availability_method == AVAIL_SNMP_AND_PING) ||
((host->availability_method == AVAIL_SNMP_OR_PING) && (ping_result != HOST_UP))) {
snmp_result = ping_snmp(host, ping);
}
switch (host->availability_method) {
case AVAIL_SNMP_AND_PING:
if ((strlen(host->snmp_community) == 0) && (host->snmp_version < 3)) {
if (ping_result == HOST_UP) {
return HOST_UP;
} else {
return HOST_DOWN;
}
}
if ((snmp_result == HOST_UP) && (ping_result == HOST_UP)) {
return HOST_UP;
} else {
return HOST_DOWN;
}
case AVAIL_SNMP_OR_PING:
if ((strlen(host->snmp_community) == 0) && (host->snmp_version < 3)) {
if (ping_result == HOST_UP) {
return HOST_UP;
} else {
return HOST_DOWN;
}
}
if (snmp_result == HOST_UP) {
return HOST_UP;
}
if (ping_result == HOST_UP) {
return HOST_UP;
} else {
return HOST_DOWN;
}
case AVAIL_SNMP:
case AVAIL_SNMP_GET_NEXT:
case AVAIL_SNMP_GET_SYSDESC:
if (snmp_result == HOST_UP) {
return HOST_UP;
} else {
return HOST_DOWN;
}
case AVAIL_PING:
if (ping_result == HOST_UP) {
return HOST_UP;
} else {
return HOST_DOWN;
}
case AVAIL_NONE:
return HOST_UP;
default:
return HOST_DOWN;
}
}
/*! \fn int ping_snmp(host_t *host, ping_t *ping)
* \brief ping a host using snmp sysUptime
* \param host a pointer to the current host structure
* \param ping a pointer to the current hosts ping structure
*
* This function pings a host using snmp. It polls sysUptime by default.
* It will modify the ping structure to include the specifics of the ping results.
*
* \return HOST_UP if the host is reachable, HOST_DOWN otherwise.
*
*/
int ping_snmp(host_t *host, ping_t *ping) {
char *poll_result;
char *oid;
double begin_time, end_time, total_time;
double one_thousand = 1000.00;
if (is_debug_device(host->id)) {
SPINE_LOG(("Device[%i] DEBUG: Entering SNMP Ping", host->id));
} else {
SPINE_LOG_DEBUG(("Device[%i] DEBUG: Entering SNMP Ping", host->id));
}
if (host->snmp_session) {
if ((strlen(host->snmp_community) != 0) || (host->snmp_version == 3)) {
/* by default, we look at sysUptime */
if (host->availability_method == AVAIL_SNMP_GET_NEXT) {
oid = strdup(".1.3");
} else if (host->availability_method == AVAIL_SNMP_GET_SYSDESC) {
oid = strdup(".1.3.6.1.2.1.1.1.0");
} else {
oid = strdup(".1.3.6.1.2.1.1.3.0");
}
if (oid == NULL) die("ERROR: malloc(): strdup() oid ping.c failed");
/* record start time */
begin_time = get_time_as_double();
if (host->availability_method == AVAIL_SNMP_GET_NEXT) {
poll_result = snmp_getnext(host, oid);
} else {
poll_result = snmp_get(host, oid);
}
/* record end time */
end_time = get_time_as_double();
free(oid);
total_time = (end_time - begin_time) * one_thousand;
/* do positive test cases first */
if (host->snmp_status == SNMPERR_UNKNOWN_OBJID) {
snprintf(ping->snmp_response, SMALL_BUFSIZE, "Device responded to SNMP");
snprintf(ping->snmp_status, 50, "%.5f", total_time);
free(poll_result);
return HOST_UP;
} else if (host->snmp_status != SNMPERR_SUCCESS) {
if (is_debug_device(host->id)) {
if (host->snmp_status == STAT_TIMEOUT) {
SPINE_LOG(("Device[%i] SNMP Ping Timeout", host->id));
} else {
SPINE_LOG(("Device[%i] SNMP Ping Unknown Error", host->id));
}
} else {
if (host->snmp_status == STAT_TIMEOUT) {
SPINE_LOG_MEDIUM(("Device[%i] SNMP Ping Timeout", host->id));
} else {
SPINE_LOG_MEDIUM(("Device[%i] SNMP Ping Unknown Error", host->id));
}
}
snprintf(ping->snmp_response, SMALL_BUFSIZE, "Device did not respond to SNMP");
free(poll_result);
return HOST_DOWN;
} else {
snprintf(ping->snmp_response, SMALL_BUFSIZE, "Device responded to SNMP");
snprintf(ping->snmp_status, 50, "%.5f", total_time);
free(poll_result);
return HOST_UP;
}
} else {
snprintf(ping->snmp_status, 50, "0.00");
snprintf(ping->snmp_response, SMALL_BUFSIZE, "Device does not require SNMP");
return HOST_UP;
}
} else {
snprintf(ping->snmp_status, 50, "0.00");
snprintf(ping->snmp_response, SMALL_BUFSIZE, "Invalid SNMP Session");
return HOST_DOWN;
}
}
/*! \fn int ping_icmp(host_t *host, ping_t *ping)
* \brief ping a host using an ICMP packet
* \param host a pointer to the current host structure
* \param ping a pointer to the current hosts ping structure
*
* This function pings a host using ICMP. The ICMP packet contains a marker
* to the "Cacti" application so that firewall's can be configured to allow.
* It will modify the ping structure to include the specifics of the ping results.
*
* \return HOST_UP if the host is reachable, HOST_DOWN otherwise.
*
*/
int ping_icmp(host_t *host, ping_t *ping) {
int icmp_socket;
double begin_time, end_time, total_time;
double host_timeout;
double one_thousand = 1000.00;
struct timeval timeout;
struct sockaddr_in recvname;
struct sockaddr_in fromname;
char socket_reply[BUFSIZE];
int retry_count;
char *cacti_msg = "cacti-monitoring-system\0";
int packet_len;
socklen_t fromlen;
ssize_t return_code;
fd_set socket_fds;
static unsigned int seq = 0;
struct icmp *icmp;
struct ip *ip;
struct icmp *pkt;
unsigned char *packet;
char *new_hostname;
if (is_debug_device(host->id)) {
SPINE_LOG(("Device[%i] DEBUG: Entering ICMP Ping", host->id));
} else {
SPINE_LOG_DEBUG(("Device[%i] DEBUG: Entering ICMP Ping", host->id));
}
/* remove "tcp:" from hostname */
new_hostname = remove_tcp_udp_from_hostname(host->hostname);
/* get ICMP socket */
retry_count = 0;
while (TRUE) {
#if !(defined(__CYGWIN__) && !defined(SOLAR_PRIV))
if (hasCaps() != TRUE) {
thread_mutex_lock(LOCK_SETEUID);
if (seteuid(0) == -1) {
SPINE_LOG_DEBUG(("WARNING: Spine unable to obtain root privileges."));
}
}
#endif
if ((icmp_socket = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP)) == -1) {
usleep(500000);
retry_count++;
if (retry_count > 4) {
snprintf(ping->ping_response, SMALL_BUFSIZE, "ICMP: Ping unable to create ICMP Socket");
snprintf(ping->ping_status, 50, "down");
free(new_hostname);
#if !(defined(__CYGWIN__) && !defined(SOLAR_PRIV))
if (hasCaps() != TRUE) {
if (seteuid(getuid()) == -1) {
SPINE_LOG_DEBUG(("WARNING: Spine unable to drop from root to local user."));
}
thread_mutex_unlock(LOCK_SETEUID);
}
#endif
return HOST_DOWN;
break;
}
} else {
break;
}
}
#if !(defined(__CYGWIN__) && !defined(SOLAR_PRIV))
if (hasCaps() != TRUE) {
if (seteuid(getuid()) == -1) {
SPINE_LOG_DEBUG(("WARNING: Spine unable to drop from root to local user."));
}
thread_mutex_unlock(LOCK_SETEUID);
}
#endif
/* convert the host timeout to a double precision number in seconds */
host_timeout = host->ping_timeout;
/* allocate the packet in memory */
packet_len = ICMP_HDR_SIZE + strlen(cacti_msg);
if (!(packet = malloc(packet_len))) {
die("ERROR: Fatal malloc error: ping.c ping_icmp!");
}
memset(packet, 0, packet_len);
/* set the memory of the ping address */
memset(&fromname, 0, sizeof(struct sockaddr_in));
memset(&recvname, 0, sizeof(struct sockaddr_in));
icmp = (struct icmp*) packet;
icmp->icmp_type = ICMP_ECHO;
icmp->icmp_code = 0;
icmp->icmp_id = getpid() & 0xFFFF;
/* lock set/get the sequence and unlock */
thread_mutex_lock(LOCK_GHBN);
icmp->icmp_seq = seq++;
thread_mutex_unlock(LOCK_GHBN);
icmp->icmp_cksum = 0;
memcpy(packet+ICMP_HDR_SIZE, cacti_msg, strlen(cacti_msg));
icmp->icmp_cksum = get_checksum(packet, packet_len);
/* hostname must be nonblank */
if ((strlen(host->hostname) != 0) && (icmp_socket != -1)) {
/* initialize variables */
snprintf(ping->ping_status, 50, "down");
snprintf(ping->ping_response, SMALL_BUFSIZE, "default");
/* get address of hostname */
if (init_sockaddr(&fromname, new_hostname, 7)) {
retry_count = 0;
total_time = 0;
begin_time = get_time_as_double();
/* initialize file descriptor to review for input/output */
FD_ZERO(&socket_fds);
FD_SET(icmp_socket,&socket_fds);
while (1) {
if (retry_count > host->ping_retries) {
snprintf(ping->ping_response, SMALL_BUFSIZE, "ICMP: Ping timed out");
snprintf(ping->ping_status, 50, "down");
free(new_hostname);
free(packet);
close(icmp_socket);
return HOST_DOWN;
}
/* decrement the timeout value by the total time */
timeout.tv_sec = rint((host_timeout - total_time) / 1000);
timeout.tv_usec = ((int) (host_timeout - total_time) % 1000) * 1000;
/* set the socket send and receive timeout */
setsockopt(icmp_socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeout, sizeof(timeout));
setsockopt(icmp_socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeout, sizeof(timeout));
/* send packet to destination */
return_code = sendto(icmp_socket, packet, packet_len, 0, (struct sockaddr *) &fromname, sizeof(fromname));
fromlen = sizeof(fromname);
/* wait for a response on the socket */
keep_listening:
return_code = select(FD_SETSIZE, &socket_fds, NULL, NULL, &timeout);
/* record end time */
end_time = get_time_as_double();
/* caculate total time */
total_time = (end_time - begin_time) * one_thousand;
if (total_time < host_timeout) {
#if !(defined(__CYGWIN__))
return_code = recvfrom(icmp_socket, socket_reply, BUFSIZE, MSG_WAITALL, (struct sockaddr *) &recvname, &fromlen);
#else
return_code = recvfrom(icmp_socket, socket_reply, BUFSIZE, MSG_PEEK, (struct sockaddr *) &recvname, &fromlen);
#endif
if (return_code < 0) {
if (errno == EINTR) {
/* call was interrupted by some system event */
if (is_debug_device(host->id)) {
SPINE_LOG(("Device[%i] DEBUG: Received EINTR", host->id));
} else {
SPINE_LOG_DEBUG(("Device[%i] DEBUG: Received EINTR", host->id));
}
goto keep_listening;
}
} else {
ip = (struct ip *) socket_reply;
pkt = (struct icmp *) (socket_reply + (ip->ip_hl << 2));
if (fromname.sin_addr.s_addr == recvname.sin_addr.s_addr) {
if (pkt->icmp_type == ICMP_ECHOREPLY) {
if (is_debug_device(host->id)) {
SPINE_LOG(("Device[%i] DEBUG: ICMP Device Alive, Try Count:%i, Time:%.4f ms", host->id, retry_count+1, (total_time)));
} else {
SPINE_LOG_DEBUG(("Device[%i] DEBUG: ICMP Device Alive, Try Count:%i, Time:%.4f ms", host->id, retry_count+1, (total_time)));
}
snprintf(ping->ping_response, SMALL_BUFSIZE, "ICMP: Device is Alive");
snprintf(ping->ping_status, 50, "%.5f", total_time);
free(new_hostname);
free(packet);
#if !(defined(__CYGWIN__) && !defined(SOLAR_PRIV))
if (hasCaps() != TRUE) {
thread_mutex_lock(LOCK_SETEUID);
if (seteuid(0) == -1) {
SPINE_LOG_DEBUG(("WARNING: Spine unable to obtain root privileges."));
}
}
#endif
close(icmp_socket);
#if !(defined(__CYGWIN__) && !defined(SOLAR_PRIV))
if (hasCaps() != TRUE) {
if (seteuid(getuid()) == -1) {
SPINE_LOG_DEBUG(("WARNING: Spine unable to drop from root to local user."));
}
thread_mutex_unlock(LOCK_SETEUID);
}
#endif
return HOST_UP;
} else {
/* received a response other than an echo reply */
if (total_time > host_timeout) {
retry_count++;
total_time = 0;
}
continue;
}
} else {
/* another host responded */
goto keep_listening;
}
}
} else {
if (is_debug_device(host->id)) {
SPINE_LOG(("Device[%i] DEBUG: Exceeded Device Timeout, Retrying", host->id));
} else {
SPINE_LOG_DEBUG(("Device[%i] DEBUG: Exceeded Device Timeout, Retrying", host->id));
}
}
total_time = 0;
retry_count++;
#ifndef SOLAR_THREAD
usleep(1000);
#endif
}
} else {
snprintf(ping->ping_response, SMALL_BUFSIZE, "ICMP: Destination hostname invalid");
snprintf(ping->ping_status, 50, "down");
free(new_hostname);
free(packet);
#if !(defined(__CYGWIN__) && !defined(SOLAR_PRIV))
if (hasCaps() != TRUE) {
thread_mutex_lock(LOCK_SETEUID);
if (seteuid(0) == -1) {
SPINE_LOG_DEBUG(("WARNING: Spine unable to obtain root privileges."));
}
}
#endif
close(icmp_socket);
#if !(defined(__CYGWIN__) && !defined(SOLAR_PRIV))
if (hasCaps() != TRUE) {
if (seteuid(getuid()) == -1) {
SPINE_LOG_DEBUG(("WARNING: Spine unable to drop from root to local user."));
}
thread_mutex_unlock(LOCK_SETEUID);
}
#endif
return HOST_DOWN;
}
} else {
snprintf(ping->ping_response, SMALL_BUFSIZE, "ICMP: Destination address not specified");
snprintf(ping->ping_status, 50, "down");
free(new_hostname);
free(packet);
if (icmp_socket != -1) {
#if !(defined(__CYGWIN__) && !defined(SOLAR_PRIV))
if (hasCaps() != TRUE) {
thread_mutex_lock(LOCK_SETEUID);
if (seteuid(0) == -1) {
SPINE_LOG_DEBUG(("WARNING: Spine unable to obtain root privileges."));
}
}
#endif
close(icmp_socket);
#if !(defined(__CYGWIN__) && !defined(SOLAR_PRIV))
if (hasCaps() != TRUE) {
if (seteuid(getuid()) == -1) {
SPINE_LOG_DEBUG(("WARNING: Spine unable to drop from root to local user."));
}
thread_mutex_unlock(LOCK_SETEUID);
}
#endif
}
return HOST_DOWN;
}
}
/*! \fn int ping_udp(host_t *host, ping_t *ping)
* \brief ping a host using an UDP datagram
* \param host a pointer to the current host structure
* \param ping a pointer to the current hosts ping structure
*
* This function pings a host using UDP. The UDP datagram contains a marker
* to the "Cacti" application so that firewall's can be configured to allow.
* It will modify the ping structure to include the specifics of the ping results.
*
* \return HOST_UP if the host is reachable, HOST_DOWN otherwise.
*
*/
int ping_udp(host_t *host, ping_t *ping) {
double begin_time, end_time, total_time;
double host_timeout;
double one_thousand = 1000.00;
struct timeval timeout;
int udp_socket;
struct sockaddr_in servername;
char socket_reply[BUFSIZE];
int retry_count;
char request[BUFSIZE];
int request_len;
int return_code;
fd_set socket_fds;
char *new_hostname;
if (is_debug_device(host->id)) {
SPINE_LOG(("Device[%i] DEBUG: Entering UDP Ping", host->id));
} else {
SPINE_LOG_DEBUG(("Device[%i] DEBUG: Entering UDP Ping", host->id));
}
/* set total time */
total_time = 0;
begin_time = get_time_as_double();
/* remove "udp:" from hostname */
new_hostname = remove_tcp_udp_from_hostname(host->hostname);
/* convert the host timeout to a double precision number in seconds */
host_timeout = host->ping_timeout;
/* initilize the socket */
udp_socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
/* hostname must be nonblank */
if ((strlen(host->hostname) != 0) && (udp_socket != -1)) {
/* initialize variables */
snprintf(ping->ping_status, 50, "down");
snprintf(ping->ping_response, SMALL_BUFSIZE, "default");
/* get address of hostname */
if (init_sockaddr(&servername, new_hostname, host->ping_port)) {
if (connect(udp_socket, (struct sockaddr *) &servername, sizeof(servername)) < 0) {
snprintf(ping->ping_status, 50, "down");
snprintf(ping->ping_response, SMALL_BUFSIZE, "UDP: Cannot connect to host");
free(new_hostname);
close(udp_socket);
return HOST_DOWN;
}
/* format packet */
snprintf(request, BUFSIZE, "cacti-monitoring-system"); /* the actual test data */
request_len = strlen(request);
retry_count = 0;
/* initialize file descriptor to review for input/output */
FD_ZERO(&socket_fds);
FD_SET(udp_socket,&socket_fds);
while (1) {
if (retry_count > host->ping_retries) {
snprintf(ping->ping_response, SMALL_BUFSIZE, "UDP: Ping timed out");
snprintf(ping->ping_status, 50, "down");
free(new_hostname);
close(udp_socket);
return HOST_DOWN;
}
/* record start time */
if (total_time == 0) {
/* establish timeout value */
timeout.tv_sec = rint(host_timeout / 1000);
timeout.tv_usec = rint((int) host_timeout % 1000) * 1000;
/* set the socket send and receive timeout */
setsockopt(udp_socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeout, sizeof(timeout));
setsockopt(udp_socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeout, sizeof(timeout));
} else {
/* decrement the timeout value by the total time */
timeout.tv_sec = rint((host_timeout - total_time) / 1000);
timeout.tv_usec = ((int) (host_timeout - total_time) % 1000) * 1000;
/* set the socket send and receive timeout */
setsockopt(udp_socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeout, sizeof(timeout));
setsockopt(udp_socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeout, sizeof(timeout));
}
/* send packet to destination */
send(udp_socket, request, request_len, 0);
/* wait for a response on the socket */
wait_more:
return_code = select(FD_SETSIZE, &socket_fds, NULL, NULL, &timeout);
/* record end time */
end_time = get_time_as_double();
/* caculate total time */
total_time = (end_time - begin_time) * one_thousand;
/* check to see which socket talked */
if (return_code > 0) {
if (FD_ISSET(udp_socket, &socket_fds)) {
return_code = read(udp_socket, socket_reply, BUFSIZE);
if (return_code == -1 && (errno == EHOSTUNREACH || errno == ECONNRESET || errno == ECONNREFUSED)) {
if (is_debug_device(host->id)) {
SPINE_LOG(("Device[%i] DEBUG: UDP Device Alive, Try Count:%i, Time:%.4f ms", host->id, retry_count+1, (total_time)));
} else {
SPINE_LOG_DEBUG(("Device[%i] DEBUG: UDP Device Alive, Try Count:%i, Time:%.4f ms", host->id, retry_count+1, (total_time)));
}
snprintf(ping->ping_response, SMALL_BUFSIZE, "UDP: Device is Alive");
snprintf(ping->ping_status, 50, "%.5f", total_time);
free(new_hostname);
close(udp_socket);
return HOST_UP;
}
}
} else if (return_code == -1) {
if (errno == EINTR) {
/* interrupted, try again */
usleep(10000);
goto wait_more;
} else {
snprintf(ping->ping_response, SMALL_BUFSIZE, "UDP: Device is Down");
snprintf(ping->ping_status, 50, "%.5f", total_time);
free(new_hostname);
close(udp_socket);
return HOST_DOWN;
}
} else {
/* timeout */
}
if (is_debug_device(host->id)) {
SPINE_LOG(("Device[%i] DEBUG: UDP Timeout, Try Count:%i, Time:%.4f ms", host->id, retry_count+1, (total_time)));
} else {
SPINE_LOG_DEBUG(("Device[%i] DEBUG: UDP Timeout, Try Count:%i, Time:%.4f ms", host->id, retry_count+1, (total_time)));
}
retry_count++;
#ifndef SOLAR_THREAD
usleep(1000);
#endif
}
} else {
snprintf(ping->ping_response, SMALL_BUFSIZE, "UDP: Destination hostname invalid");
snprintf(ping->ping_status, 50, "down");
free(new_hostname);
close(udp_socket);
return HOST_DOWN;
}
} else {
snprintf(ping->ping_response, SMALL_BUFSIZE, "UDP: Destination address invalid or unable to create socket");
snprintf(ping->ping_status, 50, "down");
free(new_hostname);
if (udp_socket != -1) close(udp_socket);
return HOST_DOWN;
}
}
/*! \fn int ping_tcp(host_t *host, ping_t *ping)
* \brief ping a host using an TCP syn
* \param host a pointer to the current host structure
* \param ping a pointer to the current hosts ping structure
*
* This function pings a host using TCP. The TCP socket contains a marker
* to the "Cacti" application so that firewall's can be configured to allow.
* It will modify the ping structure to include the specifics of the ping results.
*
* \return HOST_UP if the host is reachable, HOST_DOWN otherwise.
*
*/
int ping_tcp(host_t *host, ping_t *ping) {
double begin_time, end_time, total_time;
double host_timeout;
double one_thousand = 1000.00;
struct timeval timeout;
int tcp_socket;
struct sockaddr_in servername;
int retry_count;
int return_code;
char *new_hostname;
if (is_debug_device(host->id)) {
SPINE_LOG(("Device[%i] DEBUG: Entering TCP Ping", host->id));
} else {
SPINE_LOG_DEBUG(("Device[%i] DEBUG: Entering TCP Ping", host->id));
}
/* remove "tcp:" from hostname */
new_hostname = remove_tcp_udp_from_hostname(host->hostname);
/* convert the host timeout to a double precision number in seconds */
host_timeout = host->ping_timeout;
/* initilize the socket */
tcp_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
/* initialize total time */
total_time = 0;
/* initialize begin time */
begin_time = get_time_as_double();
/* hostname must be nonblank */
if ((strlen(host->hostname) != 0) && (tcp_socket != -1)) {
/* initialize variables */
snprintf(ping->ping_status, 50, "down");
snprintf(ping->ping_response, SMALL_BUFSIZE, "default");
/* get address of hostname */
if (init_sockaddr(&servername, new_hostname, host->ping_port)) {
/* first attempt a connect */
retry_count = 0;
while (1) {
/* establish timeout value */
timeout.tv_sec = rint(host_timeout / 1000);
timeout.tv_usec = ((int) host_timeout % 1000) * 1000;
/* set the socket send and receive timeout */
setsockopt(tcp_socket, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeout, sizeof(timeout));
setsockopt(tcp_socket, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeout, sizeof(timeout));
/* make the connection */
return_code = connect(tcp_socket, (struct sockaddr *) &servername, sizeof(servername));
/* record end time */
end_time = get_time_as_double();
/* caculate total time */
total_time = (end_time - begin_time) * one_thousand;
if ((return_code == -1 && errno == ECONNREFUSED) || return_code == 0) {
if (is_debug_device(host->id)) {
SPINE_LOG(("Device[%i] DEBUG: TCP Device Alive, Try Count:%i, Time:%.4f ms", host->id, retry_count+1, (total_time)));
} else {
SPINE_LOG_DEBUG(("Device[%i] DEBUG: TCP Device Alive, Try Count:%i, Time:%.4f ms", host->id, retry_count+1, (total_time)));
}
snprintf(ping->ping_response, SMALL_BUFSIZE, "TCP: Device is Alive");
snprintf(ping->ping_status, 50, "%.5f", total_time);
free(new_hostname);
close(tcp_socket);
return HOST_UP;
} else {
#if defined(__CYGWIN__)
snprintf(ping->ping_status, 50, "down");
snprintf(ping->ping_response, SMALL_BUFSIZE, "TCP: Cannot connect to host");
free(new_hostname);
close(tcp_socket);
return HOST_DOWN;
#else
if (retry_count > host->ping_retries) {
snprintf(ping->ping_status, 50, "down");
snprintf(ping->ping_response, SMALL_BUFSIZE, "TCP: Cannot connect to host");
free(new_hostname);
close(tcp_socket);
return HOST_DOWN;
} else {
retry_count++;
}
#endif
}
}
} else {
snprintf(ping->ping_response, SMALL_BUFSIZE, "TCP: Destination hostname invalid");
snprintf(ping->ping_status, 50, "down");
free(new_hostname);
close(tcp_socket);
return HOST_DOWN;
}
} else {
snprintf(ping->ping_response, SMALL_BUFSIZE, "TCP: Destination address invalid or unable to create socket");
snprintf(ping->ping_status, 50, "down");
free(new_hostname);
if (tcp_socket != -1) close(tcp_socket);
return HOST_DOWN;
}
}
/*! \fn int init_sockaddr(struct sockaddr_in *name, const char *hostname, unsigned short int port)
* \brief converts a hostname to an internet address
*
* \return TRUE if successful, FALSE otherwise.
*
*/
int init_sockaddr(struct sockaddr_in *name, const char *hostname, unsigned short int port) {
struct hostent *hostinfo;
int retry_count;
#if !defined(H_ERRNO_DECLARED) && !defined(_AIX)
extern int h_errno;
#endif
name->sin_family = AF_INET;
name->sin_port = htons (port);
retry_count = 0;
#ifdef HAVE_THREADSAFE_GETHOSTBYNAME
retry:
hostinfo = gethostbyname(hostname);
if (!hostinfo) {
if (h_errno == TRY_AGAIN && retry_count < 3) {
retry_count++;
usleep(50000);
goto retry;
} else {
return NULL;
}
} else {
name->sin_addr = *(struct in_addr *) hostinfo->h_addr;
}
#else
#ifdef HAVE_GETHOSTBYNAME_R_GLIBC
struct hostent result_buf;
size_t len = 1024;
char *buf;
int herr;
int rv;
buf = malloc(len*sizeof(char));
memset(buf, 0, len*sizeof(char));
while (1) {
rv = gethostbyname_r(hostname, &result_buf, buf, len,
&hostinfo, &herr);
if (!hostinfo) {
if (rv == ERANGE) {
len *= 2;
buf = realloc(buf, len*sizeof(char));
continue;
} else if (herr == TRY_AGAIN && retry_count < 3) {
retry_count++;
usleep(50000);
continue;
} else {
free(buf);
return FALSE;
}
} else {
break;
}
}
name->sin_addr = *(struct in_addr *) hostinfo->h_addr;
free(buf);
#else
#ifdef HAVE_GETHOSTBYNAME_R_SOLARIS
size_t len = 8192;
char *buf = NULL;
struct hostent result;
buf = malloc(len*sizeof(char));
memset(buf, 0, sizeof(buf));
while (1) {
hostinfo = gethostbyname_r(hostname, &result, buf, len, &h_errno);
if (!hostinfo) {
if (errno == ERANGE) {
len += 1024;
buf = realloc(buf, len*sizeof(char));
memset(buf, 0, sizeof(buf));
continue;
} else if (h_errno == TRY_AGAIN && retry_count < 3) {
retry_count++;
usleep(50000);
continue;
} else {
free(buf);
return NULL;
}
} else {
break;
}
}
name->sin_addr = *(struct in_addr *) hostinfo->h_addr;
free(buf);
#else
#ifdef HAVE_GETHOSTBYNAME_R_HPUX
struct hostent hostent;
struct hostent_data buf;
int rv;
rv = gethostbyname_r(hostname, &hostent, &buf);
if (!rv) {
name->sin_addr = *(struct in_addr *) hostent->h_addr;
}
#else
retry:
thread_mutex_lock(LOCK_GHBN);
hostinfo = gethostbyname(hostname);
if (!hostinfo) {
thread_mutex_unlock(LOCK_GHBN);
if (h_errno == TRY_AGAIN && retry_count < 3) {
retry_count++;
usleep(50000);
goto retry;
} else {
hostinfo = NULL;
}
} else {
name->sin_addr = *(struct in_addr *) hostinfo->h_addr;
thread_mutex_unlock(LOCK_GHBN);
}
#endif
#endif
#endif
#endif
if (hostinfo == NULL) {
SPINE_LOG(("WARNING: Unknown host %s", hostname));
return FALSE;
} else {
return TRUE;
}
}
/*! \fn char *remove_tcp_udp_from_hostname(char *hostname)
* \brief removes 'TCP[6]:' or 'UDP[6]:' from a hostname required to ping
*
* \return char hostname a trimmed hostname
*
*/
char *remove_tcp_udp_from_hostname(char *hostname) {
char *cleaned_hostname;
if (!(cleaned_hostname = (char *) malloc(strlen(hostname)+1))) {
die("ERROR: Fatal malloc error: ping.c remove_tcp_udp_from_hostname");
}
if (!strncasecmp(hostname, "TCP:", 4) ||
!strncasecmp(hostname, "UDP:", 4)) {
memcpy(cleaned_hostname, hostname+4, strlen(hostname)-4);
cleaned_hostname[strlen(hostname)-4] = '\0';