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/**
* collectd - src/hddtemp.c
* Copyright (C) 2005,2006 Vincent Stehlé
* Copyright (C) 2006-2010 Florian octo Forster
* Copyright (C) 2008 Sebastian Harl
* Copyright (C) 2014 Carnegie Mellon University
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors:
* Vincent Stehlé <vincent.stehle at free.fr>
* Florian octo Forster <octo at collectd.org>
* Sebastian Harl <sh at tokkee.org>
* Benjamin Gilbert <bgilbert at backtick.net>
*
* TODO:
* Do a pass, some day, and spare some memory. We consume too much for now
* in string buffers and the like.
*
**/
#include "collectd.h"
#include "common.h"
#include "plugin.h"
#include <assert.h>
#include <libgen.h> /* for basename */
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#if HAVE_LINUX_MAJOR_H
#include <linux/major.h>
#endif
#define HDDTEMP_DEF_HOST "127.0.0.1"
#define HDDTEMP_DEF_PORT "7634"
#define HDDTEMP_MAX_RECV_BUF (1 << 20)
static const char *config_keys[] = {"Host", "Port"};
static int config_keys_num = STATIC_ARRAY_SIZE(config_keys);
static char *hddtemp_host;
static char hddtemp_port[16];
/*
* NAME
* hddtemp_query_daemon
*
* DESCRIPTION
* Connect to the hddtemp daemon and receive data.
*
* ARGUMENTS:
* `buffer' The buffer where we put the received ascii string.
* `buffer_size' Size of the buffer
*
* RETURN VALUE:
* >= 0 if ok, < 0 otherwise.
*
* NOTES:
* Example of possible strings, as received from daemon:
* |/dev/hda|ST340014A|36|C|
* |/dev/hda|ST380011A|46|C||/dev/hdd|ST340016A|SLP|*|
*
* FIXME:
* we need to create a new socket each time. Is there another way?
* Hm, maybe we can re-use the `sockaddr' structure? -octo
*/
static char *hddtemp_query_daemon(void) {
int fd;
ssize_t status;
char *buffer;
int buffer_size;
int buffer_fill;
char *new_buffer;
const char *host;
const char *port;
struct addrinfo *ai_list;
int ai_return;
host = hddtemp_host;
if (host == NULL)
host = HDDTEMP_DEF_HOST;
port = hddtemp_port;
if (strlen(port) == 0)
port = HDDTEMP_DEF_PORT;
struct addrinfo ai_hints = {.ai_flags = AI_ADDRCONFIG,
.ai_family = AF_UNSPEC,
.ai_protocol = IPPROTO_TCP,
.ai_socktype = SOCK_STREAM};
if ((ai_return = getaddrinfo(host, port, &ai_hints, &ai_list)) != 0) {
ERROR("hddtemp plugin: getaddrinfo (%s, %s): %s", host, port,
(ai_return == EAI_SYSTEM) ? STRERRNO : gai_strerror(ai_return));
return NULL;
}
fd = -1;
for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL;
ai_ptr = ai_ptr->ai_next) {
/* create our socket descriptor */
fd = socket(ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
if (fd < 0) {
ERROR("hddtemp plugin: socket: %s", STRERRNO);
continue;
}
/* connect to the hddtemp daemon */
if (connect(fd, (struct sockaddr *)ai_ptr->ai_addr, ai_ptr->ai_addrlen)) {
INFO("hddtemp plugin: connect (%s, %s) failed: %s", host, port, STRERRNO);
close(fd);
fd = -1;
continue;
}
/* A socket could be opened and connecting succeeded. We're
* done. */
break;
}
freeaddrinfo(ai_list);
if (fd < 0) {
ERROR("hddtemp plugin: Could not connect to daemon.");
return NULL;
}
/* receive data from the hddtemp daemon */
buffer = NULL;
buffer_size = 0;
buffer_fill = 0;
while (1) {
if ((buffer_size == 0) || (buffer_fill >= buffer_size - 1)) {
if (buffer_size == 0)
buffer_size = 1024;
else
buffer_size *= 2;
if (buffer_size > HDDTEMP_MAX_RECV_BUF) {
WARNING("hddtemp plugin: Message from hddtemp has been "
"truncated.");
break;
}
new_buffer = realloc(buffer, buffer_size);
if (new_buffer == NULL) {
close(fd);
free(buffer);
ERROR("hddtemp plugin: Allocation failed.");
return NULL;
}
buffer = new_buffer;
}
status = read(fd, buffer + buffer_fill, buffer_size - buffer_fill - 1);
if (status == 0) {
break;
} else if (status == -1) {
if ((errno == EAGAIN) || (errno == EINTR))
continue;
ERROR("hddtemp plugin: Error reading from socket: %s", STRERRNO);
close(fd);
free(buffer);
return NULL;
}
buffer_fill += status;
}
if (buffer_fill == 0) {
WARNING("hddtemp plugin: Peer has unexpectedly shut down "
"the socket. Buffer: `%s'",
buffer);
close(fd);
free(buffer);
return NULL;
}
assert(buffer_fill < buffer_size);
buffer[buffer_fill] = '\0';
close(fd);
return buffer;
}
static int hddtemp_config(const char *key, const char *value) {
if (strcasecmp(key, "Host") == 0) {
if (hddtemp_host != NULL)
free(hddtemp_host);
hddtemp_host = strdup(value);
} else if (strcasecmp(key, "Port") == 0) {
int port = (int)(atof(value));
if ((port > 0) && (port <= 65535))
snprintf(hddtemp_port, sizeof(hddtemp_port), "%i", port);
else
sstrncpy(hddtemp_port, value, sizeof(hddtemp_port));
} else {
return -1;
}
return 0;
}
static void hddtemp_submit(char *type_instance, double value) {
value_list_t vl = VALUE_LIST_INIT;
vl.values = &(value_t){.gauge = value};
vl.values_len = 1;
sstrncpy(vl.plugin, "hddtemp", sizeof(vl.plugin));
sstrncpy(vl.type, "temperature", sizeof(vl.type));
sstrncpy(vl.type_instance, type_instance, sizeof(vl.type_instance));
plugin_dispatch_values(&vl);
}
static int hddtemp_read(void) {
char *buf;
char *ptr;
char *saveptr;
char *name;
char *model;
char *temperature;
char *mode;
/* get data from daemon */
buf = hddtemp_query_daemon();
if (buf == NULL)
return -1;
/* NB: strtok_r will eat up "||" and leading "|"'s */
ptr = buf;
saveptr = NULL;
while ((name = strtok_r(ptr, "|", &saveptr)) != NULL &&
(model = strtok_r(NULL, "|", &saveptr)) != NULL &&
(temperature = strtok_r(NULL, "|", &saveptr)) != NULL &&
(mode = strtok_r(NULL, "|", &saveptr)) != NULL) {
double temperature_value;
ptr = NULL;
/* Skip non-temperature information */
if (mode[0] != 'C' && mode[0] != 'F')
continue;
name = basename(name);
temperature_value = atof(temperature);
/* Convert farenheit to celsius */
if (mode[0] == 'F')
temperature_value = (temperature_value - 32.0) * 5.0 / 9.0;
hddtemp_submit(name, temperature_value);
}
free(buf);
return 0;
} /* int hddtemp_read */
/* module_register
Register collectd plugin. */
void module_register(void) {
plugin_register_config("hddtemp", hddtemp_config, config_keys,
config_keys_num);
plugin_register_read("hddtemp", hddtemp_read);
}