src/backend/mk-livestatus.c

   1 /*
   2  * syscollector - src/backend/mk-livestatus.c
   3  * Copyright (C) 2012 Sebastian 'tokkee' Harl <sh@tokkee.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  16  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  17  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  18  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
  19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "syscollector.h"
  29 #include "core/plugin.h"
  30 #include "core/store.h"
  31 #include "utils/string.h"
  32 #include "utils/unixsock.h"
  33
  34 #include "liboconfig/utils.h"
  35
  36 #include <assert.h>
  37
  38 #include <errno.h>
  39
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43
  44 SC_PLUGIN_MAGIC;
  45
  46 /*
  47  * private helper functions
  48  */
  49
  50 static int
  51 sc_livestatus_get_data(sc_unixsock_client_t __attribute__((unused)) *client,
  52                 size_t n, sc_data_t *data, sc_object_t __attribute__((unused)) *user_data)
  53 {
  54         char *hostname = NULL;
  55         sc_time_t timestamp = 0;
  56
  57         sc_host_t host = SC_HOST_INIT;
  58
  59         int status;
  60
  61         assert(n == 2);
  62         assert((data[0].type == SC_TYPE_STRING)
  63                         && (data[1].type == SC_TYPE_DATETIME));
  64
  65         hostname  = strdup(data[0].data.string);
  66         timestamp = data[1].data.datetime;
  67
  68         host.host_name = hostname;
  69         host.host_last_update = timestamp;
  70
  71         status = sc_store_host(&host);
  72
  73         if (status < 0) {
  74                 fprintf(stderr, "MK Livestatus backend: Failed to store/update "
  75                                 "host '%s'.\n", hostname);
  76                 free(hostname);
  77                 return -1;
  78         }
  79         else if (status > 0) /* value too old */
  80                 return 0;
  81
  82         fprintf(stderr, "MK Livestatus backend: Added/updated host '%s' "
  83                         "(last update timestamp = %"PRIscTIME").\n",
  84                         hostname, timestamp);
  85         free(hostname);
  86         return 0;
  87 } /* sc_livestatus_get_data */
  88
  89 /*
  90  * plugin API
  91  */
  92
  93 static int
  94 sc_livestatus_init(sc_object_t *user_data)
  95 {
  96         sc_unixsock_client_t *client;
  97
  98         if (! user_data)
  99                 return -1;
 100
 101         client = SC_OBJ_WRAPPER(user_data)->data;
 102         if (sc_unixsock_client_connect(client)) {
 103                 fprintf(stderr, "MK Livestatus backend: "
 104                                 "Failed to connect to livestatus @ %s.\n",
 105                                 sc_unixsock_client_path(client));
 106                 return -1;
 107         }
 108
 109         fprintf(stderr, "MK Livestatus backend: Successfully "
 110                         "connected to livestatus @ %s.\n",
 111                         sc_unixsock_client_path(client));
 112         return 0;
 113 } /* sc_livestatus_init */
 114
 115 static int
 116 sc_livestatus_collect(sc_object_t *user_data)
 117 {
 118         sc_unixsock_client_t *client;
 119
 120         int status;
 121
 122         if (! user_data)
 123                 return -1;
 124
 125         client = SC_OBJ_WRAPPER(user_data)->data;
 126
 127         status = sc_unixsock_client_send(client, "GET hosts\r\n"
 128                         "Columns: name last_check");
 129         if (status <= 0) {
 130                 fprintf(stderr, "MK Livestatus backend: Failed to send "
 131                                 "'GET hosts' command to livestatus @ %s.\n",
 132                                 sc_unixsock_client_path(client));
 133                 return -1;
 134         }
 135
 136         sc_unixsock_client_shutdown(client, SHUT_WR);
 137
 138         if (sc_unixsock_client_process_lines(client, sc_livestatus_get_data,
 139                                 /* user data */ NULL, /* -> EOF */ -1, /* delim */ ";",
 140                                 /* column count */ 2, SC_TYPE_STRING, SC_TYPE_DATETIME)) {
 141                 fprintf(stderr, "MK Livestatus backend: Failed to read response "
 142                                 "from livestatus @ %s.\n", sc_unixsock_client_path(client));
 143                 return -1;
 144         }
 145
 146         if ((! sc_unixsock_client_eof(client))
 147                         || sc_unixsock_client_error(client)) {
 148                 char errbuf[1024];
 149                 fprintf(stderr, "MK Livestatus backend: Failed to read host "
 150                                 "from livestatus @ %s: %s\n",
 151                                 sc_unixsock_client_path(client),
 152                                 sc_strerror(errno, errbuf, sizeof(errbuf)));
 153                 return -1;
 154         }
 155         return 0;
 156 } /* sc_livestatus_collect */
 157
 158 static int
 159 sc_livestatus_config_instance(oconfig_item_t *ci)
 160 {
 161         char *name = NULL;
 162         char *socket = NULL;
 163
 164         char cb_name[1024];
 165
 166         sc_object_t *user_data;
 167         sc_unixsock_client_t *client;
 168
 169         int i;
 170
 171         if (oconfig_get_string(ci, &name)) {
 172                 fprintf(stderr, "MK Livestatus backend: Instance requires a single "
 173                                 "string argument\n\tUsage: <Instance NAME>\n");
 174                 return -1;
 175         }
 176
 177         for (i = 0; i < ci->children_num; ++i) {
 178                 oconfig_item_t *child = ci->children + i;
 179
 180                 if (! strcasecmp(child->key, "Socket"))
 181                         oconfig_get_string(child, &socket);
 182                 else
 183                         fprintf(stderr, "MK Livestatus backend: Ignoring unknown config "
 184                                         "option '%s' inside <Instance %s>.\n",
 185                                         child->key, name);
 186         }
 187
 188         if (! socket) {
 189                 fprintf(stderr, "MK Livestatus backend: Instance '%s' missing "
 190                                 "the 'Socket' option.\n", name);
 191                 return -1;
 192         }
 193
 194         snprintf(cb_name, sizeof(cb_name), "mk-livestatus-%s", name);
 195         cb_name[sizeof(cb_name) - 1] = '\0';
 196
 197         client = sc_unixsock_client_create(socket);
 198         if (! client) {
 199                 char errbuf[1024];
 200                 fprintf(stderr, "MK Livestatus backend: Failed to create unixsock "
 201                                 "client: %s\n", sc_strerror(errno, errbuf, sizeof(errbuf)));
 202                 return -1;
 203         }
 204
 205         user_data = sc_object_create_wrapper(client,
 206                         (void (*)(void *))sc_unixsock_client_destroy);
 207         if (! user_data) {
 208                 sc_unixsock_client_destroy(client);
 209                 fprintf(stderr, "MK Livestatus backend: Failed to "
 210                                 "allocate sc_object_t\n");
 211                 return -1;
 212         }
 213
 214         sc_plugin_register_init(cb_name, sc_livestatus_init, user_data);
 215         sc_plugin_register_collector(cb_name, sc_livestatus_collect,
 216                         /* interval */ NULL, user_data);
 217
 218         /* pass control to the list */
 219         sc_object_deref(user_data);
 220         return 0;
 221 } /* sc_livestatus_config_instance */
 222
 223 static int
 224 sc_livestatus_config(oconfig_item_t *ci)
 225 {
 226         int i;
 227
 228         for (i = 0; i < ci->children_num; ++i) {
 229                 oconfig_item_t *child = ci->children + i;
 230
 231                 if (! strcasecmp(child->key, "Instance"))
 232                         sc_livestatus_config_instance(child);
 233                 else
 234                         fprintf(stderr, "MK Livestatus backend: Ignoring unknown config "
 235                                         "option '%s'.\n", child->key);
 236         }
 237         return 0;
 238 } /* sc_livestatus_config */
 239
 240 int
 241 sc_module_init(sc_plugin_info_t *info)
 242 {
 243         sc_plugin_set_info(info, SC_PLUGIN_INFO_NAME, "MK-Livestatus");
 244         sc_plugin_set_info(info, SC_PLUGIN_INFO_DESC,
 245                         "backend accessing Nagios/Icinga/Shinken using MK Livestatus");
 246         sc_plugin_set_info(info, SC_PLUGIN_INFO_COPYRIGHT,
 247                         "Copyright (C) 2012 Sebastian 'tokkee' Harl <sh@tokkee.org>");
 248         sc_plugin_set_info(info, SC_PLUGIN_INFO_LICENSE, "BSD");
 249         sc_plugin_set_info(info, SC_PLUGIN_INFO_VERSION, SC_VERSION);
 250         sc_plugin_set_info(info, SC_PLUGIN_INFO_PLUGIN_VERSION, SC_VERSION);
 251
 252         sc_plugin_register_config("mk-livestatus", sc_livestatus_config);
 253         return 0;
 254 } /* sc_version_extra */
 255
 256 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 257