├── COPYING ├── README.rst ├── knot_exporter └── knot_exporter.service /COPYING: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. 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Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | 676 | In addition, as a special exception, the copyright holders give 677 | permission to link the code of portions of this program with the 678 | OpenSSL library under certain conditions as described in each 679 | individual source file, and distribute linked combinations including 680 | the two. 681 | You must obey the GNU General Public License in all respects for all 682 | of the code used other than OpenSSL. If you modify file(s) with this 683 | exception, you may extend this exception to your version of the 684 | file(s), but you are not obligated to do so. If you do not wish to do 685 | so, delete this exception statement from your version. If you delete 686 | this exception statement from all source files in the program, then 687 | also delete it here. 688 | -------------------------------------------------------------------------------- /README.rst: -------------------------------------------------------------------------------- 1 | > :warning: The Knot project provides an official exporter_ now, so this project has been archived. 2 | 3 | .. _exporter: https://github.com/CZ-NIC/knot/tree/master/python/knot_exporter 4 | 5 | knot_exporter 6 | ============= 7 | 8 | knot_exporter is a Prometheus exporter for Knot_'s server and query statistics. 9 | 10 | .. _Knot: https://www.knot-dns.cz/ 11 | 12 | Getting Started 13 | --------------- 14 | 15 | knot_exporter uses Knot's control unix socket, so Knot has to be installed 16 | on the same machine as knot_exporter, and knot_exporter must be executed 17 | by a user with access to Knot's socket path. 18 | 19 | The Knot instance also needs to be configured to collect per-zone query 20 | statistic. This can be done by enabling and configuring the `stats module`_. 21 | 22 | .. _`stats module`: https://www.knot-dns.cz/docs/2.6/html/modules.html?highlight=mod%20stats#stats-query-statistics 23 | 24 | Once everything is in place, knot_exporter can be started like so: 25 | 26 | .. code-block:: bash 27 | 28 | $ ./knot_exporter --knot-library-path /path/to/libknot.so 29 | 30 | To get a complete list of the available options, run: 31 | 32 | .. code-block:: bash 33 | 34 | $ ./knot_exporter --help 35 | 36 | Copyright 37 | --------- 38 | 39 | Copyright (C) 2018 Alessandro Ghedini 40 | 41 | Copyright (C) 2018 CZ.NIC, z.s.p.o. 42 | 43 | The Python bindings for libknot were adapted from the code available in the 44 | official `Knot repo`_. 45 | 46 | See COPYING_ for the license. 47 | 48 | .. _COPYING: https://github.com/ghedo/pflask/tree/master/COPYING 49 | .. _`Knot repo`: https://github.com/CZ-NIC/knot/blob/master/python/libknot/control.py 50 | -------------------------------------------------------------------------------- /knot_exporter: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python3 2 | 3 | from ctypes import cdll, c_void_p, c_int, c_char_p, c_uint, byref 4 | from enum import IntEnum 5 | 6 | import argparse 7 | import http.server 8 | 9 | from prometheus_client.core import REGISTRY 10 | from prometheus_client.core import GaugeMetricFamily 11 | from prometheus_client.exposition import MetricsHandler 12 | 13 | CTL_ALLOC = None 14 | CTL_FREE = None 15 | CTL_SET_TIMEOUT = None 16 | CTL_CONNECT = None 17 | CTL_CLOSE = None 18 | CTL_SEND = None 19 | CTL_RECEIVE = None 20 | CTL_ERROR = None 21 | 22 | def load_lib(path=None): 23 | """Loads the libknot library.""" 24 | 25 | LIB = cdll.LoadLibrary(path) 26 | 27 | global CTL_ALLOC 28 | CTL_ALLOC = LIB.knot_ctl_alloc 29 | CTL_ALLOC.restype = c_void_p 30 | 31 | global CTL_FREE 32 | CTL_FREE = LIB.knot_ctl_free 33 | CTL_FREE.argtypes = [c_void_p] 34 | 35 | global CTL_SET_TIMEOUT 36 | CTL_SET_TIMEOUT = LIB.knot_ctl_set_timeout 37 | CTL_SET_TIMEOUT.argtypes = [c_void_p, c_int] 38 | 39 | global CTL_CONNECT 40 | CTL_CONNECT = LIB.knot_ctl_connect 41 | CTL_CONNECT.restype = c_int 42 | CTL_CONNECT.argtypes = [c_void_p, c_char_p] 43 | 44 | global CTL_CLOSE 45 | CTL_CLOSE = LIB.knot_ctl_close 46 | CTL_CLOSE.argtypes = [c_void_p] 47 | 48 | global CTL_SEND 49 | CTL_SEND = LIB.knot_ctl_send 50 | CTL_SEND.restype = c_int 51 | CTL_SEND.argtypes = [c_void_p, c_uint, c_void_p] 52 | 53 | global CTL_RECEIVE 54 | CTL_RECEIVE = LIB.knot_ctl_receive 55 | CTL_RECEIVE.restype = c_int 56 | CTL_RECEIVE.argtypes = [c_void_p, c_void_p, c_void_p] 57 | 58 | global CTL_ERROR 59 | CTL_ERROR = LIB.knot_strerror 60 | CTL_ERROR.restype = c_char_p 61 | CTL_ERROR.argtypes = [c_int] 62 | 63 | 64 | class KnotCtlError(Exception): 65 | """Libknot server control error.""" 66 | 67 | def __init__(self, message, data=None): 68 | """ 69 | @type message: str 70 | @type data: KnotCtlData 71 | """ 72 | 73 | self.message = message 74 | self.data = data 75 | 76 | def __str__(self): 77 | return "%s (data: %s)" % (self.message, self.data) 78 | 79 | 80 | class KnotCtlType(IntEnum): 81 | """Libknot server control data unit types.""" 82 | 83 | END = 0 84 | DATA = 1 85 | EXTRA = 2 86 | BLOCK = 3 87 | 88 | 89 | class KnotCtlDataIdx(IntEnum): 90 | """Libknot server control data unit indices.""" 91 | 92 | COMMAND = 0 93 | FLAGS = 1 94 | ERROR = 2 95 | SECTION = 3 96 | ITEM = 4 97 | ID = 5 98 | ZONE = 6 99 | OWNER = 7 100 | TTL = 8 101 | TYPE = 9 102 | DATA = 10 103 | FILTER = 11 104 | 105 | 106 | class KnotCtlData(object): 107 | """Libknot server control data unit.""" 108 | 109 | DataArray = c_char_p * len(KnotCtlDataIdx) 110 | 111 | def __init__(self): 112 | self.data = self.DataArray() 113 | 114 | def __str__(self): 115 | string = str() 116 | 117 | for idx in KnotCtlDataIdx: 118 | if self.data[idx]: 119 | if string: 120 | string += ", " 121 | string += "%s = %s" % (idx.name, self.data[idx]) 122 | 123 | return string 124 | 125 | def __getitem__(self, index): 126 | """Data unit item getter. 127 | 128 | @type index: KnotCtlDataIdx 129 | @rtype: str 130 | """ 131 | 132 | value = self.data[index] 133 | if not value: 134 | value = str() 135 | return value if isinstance(value, str) else value.decode() 136 | 137 | def __setitem__(self, index, value): 138 | """Data unit item setter. 139 | 140 | @type index: KnotCtlDataIdx 141 | @type value: str 142 | """ 143 | 144 | self.data[index] = c_char_p(value.encode()) if value else c_char_p() 145 | 146 | class KnotCtl(object): 147 | """Libknot server control interface.""" 148 | 149 | def __init__(self, lib_path): 150 | if not CTL_ALLOC: 151 | load_lib(path=lib_path) 152 | 153 | self.obj = CTL_ALLOC() 154 | 155 | def __del__(self): 156 | CTL_FREE(self.obj) 157 | 158 | def set_timeout(self, timeout): 159 | """Sets control socket operations timeout in seconds. 160 | 161 | @type timeout: int 162 | """ 163 | 164 | CTL_SET_TIMEOUT(self.obj, timeout * 1000) 165 | 166 | def connect(self, path): 167 | """Connect to a specified control UNIX socket. 168 | 169 | @type path: str 170 | """ 171 | 172 | ret = CTL_CONNECT(self.obj, path.encode()) 173 | if ret != 0: 174 | err = CTL_ERROR(ret) 175 | raise KnotCtlError(err if isinstance(err, str) else err.decode()) 176 | 177 | def close(self): 178 | """Disconnects from the current control socket.""" 179 | 180 | CTL_CLOSE(self.obj) 181 | 182 | def send(self, data_type, data=None): 183 | """Sends a data unit to the connected control socket. 184 | 185 | @type data_type: KnotCtlType 186 | @type data: KnotCtlData 187 | """ 188 | 189 | ret = CTL_SEND(self.obj, data_type, 190 | data.data if data else c_char_p()) 191 | if ret != 0: 192 | err = CTL_ERROR(ret) 193 | raise KnotCtlError(err if isinstance(err, str) else err.decode()) 194 | 195 | def receive(self, data=None): 196 | """Receives a data unit from the connected control socket. 197 | 198 | @type data: KnotCtlData 199 | @rtype: KnotCtlType 200 | """ 201 | 202 | data_type = c_uint() 203 | ret = CTL_RECEIVE(self.obj, byref(data_type), 204 | data.data if data else c_char_p()) 205 | if ret != 0: 206 | err = CTL_ERROR(ret) 207 | raise KnotCtlError(err if isinstance(err, str) else err.decode()) 208 | return KnotCtlType(data_type.value) 209 | 210 | def send_block(self, cmd, section=None, item=None, identifier=None, zone=None, 211 | owner=None, ttl=None, rtype=None, data=None, flags=None, 212 | filter=None): 213 | """Sends a control query block. 214 | 215 | @type cmd: str 216 | @type section: str 217 | @type item: str 218 | @type identifier: str 219 | @type zone: str 220 | @type owner: str 221 | @type ttl: str 222 | @type rtype: str 223 | @type data: str 224 | @type filter: str 225 | """ 226 | 227 | query = KnotCtlData() 228 | query[KnotCtlDataIdx.COMMAND] = cmd 229 | query[KnotCtlDataIdx.SECTION] = section 230 | query[KnotCtlDataIdx.ITEM] = item 231 | query[KnotCtlDataIdx.ID] = identifier 232 | query[KnotCtlDataIdx.ZONE] = zone 233 | query[KnotCtlDataIdx.OWNER] = owner 234 | query[KnotCtlDataIdx.TTL] = ttl 235 | query[KnotCtlDataIdx.TYPE] = rtype 236 | query[KnotCtlDataIdx.DATA] = data 237 | query[KnotCtlDataIdx.FLAGS] = flags 238 | query[KnotCtlDataIdx.FILTER] = filter 239 | 240 | self.send(KnotCtlType.DATA, query) 241 | self.send(KnotCtlType.BLOCK) 242 | 243 | def _receive_conf(self, out, reply): 244 | 245 | section = reply[KnotCtlDataIdx.SECTION] 246 | ident = reply[KnotCtlDataIdx.ID] 247 | item = reply[KnotCtlDataIdx.ITEM] 248 | data = reply[KnotCtlDataIdx.DATA] 249 | 250 | # Add the section if not exists. 251 | if section not in out: 252 | out[section] = dict() 253 | 254 | # Add the identifier if not exists. 255 | if ident and ident not in out[section]: 256 | out[section][ident] = dict() 257 | 258 | # Return if no item/value. 259 | if not item: 260 | return 261 | 262 | item_level = out[section][ident] if ident else out[section] 263 | 264 | # Treat alone identifier item differently. 265 | if item in ["id", "domain", "target"]: 266 | if data not in out[section]: 267 | out[section][data] = dict() 268 | else: 269 | if item not in item_level: 270 | item_level[item] = list() 271 | 272 | if data: 273 | item_level[item].append(data) 274 | 275 | def _receive_zone_status(self, out, reply): 276 | 277 | zone = reply[KnotCtlDataIdx.ZONE] 278 | rtype = reply[KnotCtlDataIdx.TYPE] 279 | data = reply[KnotCtlDataIdx.DATA] 280 | 281 | # Add the zone if not exists. 282 | if zone not in out: 283 | out[zone] = dict() 284 | 285 | out[zone][rtype] = data 286 | 287 | def _receive_zone(self, out, reply): 288 | 289 | zone = reply[KnotCtlDataIdx.ZONE] 290 | owner = reply[KnotCtlDataIdx.OWNER] 291 | ttl = reply[KnotCtlDataIdx.TTL] 292 | rtype = reply[KnotCtlDataIdx.TYPE] 293 | data = reply[KnotCtlDataIdx.DATA] 294 | 295 | # Add the zone if not exists. 296 | if zone not in out: 297 | out[zone] = dict() 298 | 299 | if owner not in out[zone]: 300 | out[zone][owner] = dict() 301 | 302 | if rtype not in out[zone][owner]: 303 | out[zone][owner][rtype] = dict() 304 | 305 | # Add the key/value. 306 | out[zone][owner][rtype]["ttl"] = ttl 307 | 308 | if not "data" in out[zone][owner][rtype]: 309 | out[zone][owner][rtype]["data"] = [data] 310 | else: 311 | out[zone][owner][rtype]["data"].append(data) 312 | 313 | def _receive_stats(self, out, reply): 314 | 315 | zone = reply[KnotCtlDataIdx.ZONE] 316 | section = reply[KnotCtlDataIdx.SECTION] 317 | item = reply[KnotCtlDataIdx.ITEM] 318 | idx = reply[KnotCtlDataIdx.ID] 319 | data = int(reply[KnotCtlDataIdx.DATA]) 320 | 321 | # Add the zone if not exists. 322 | if zone: 323 | if "zone" not in out: 324 | out["zone"] = dict() 325 | 326 | if zone not in out["zone"]: 327 | out["zone"][zone] = dict() 328 | 329 | section_level = out["zone"][zone] if zone else out 330 | 331 | if section not in section_level: 332 | section_level[section] = dict() 333 | 334 | if idx: 335 | if item not in section_level[section]: 336 | section_level[section][item] = dict() 337 | 338 | section_level[section][item][idx] = data 339 | else: 340 | section_level[section][item] = data 341 | 342 | def receive_stats(self): 343 | """Receives statistics answer and returns it as a structured dictionary. 344 | 345 | @rtype: dict 346 | """ 347 | 348 | out = dict() 349 | err_reply = None 350 | 351 | while True: 352 | reply = KnotCtlData() 353 | reply_type = self.receive(reply) 354 | 355 | # Stop if not data type. 356 | if reply_type not in [KnotCtlType.DATA, KnotCtlType.EXTRA]: 357 | break 358 | 359 | # Check for an error. 360 | if reply[KnotCtlDataIdx.ERROR]: 361 | err_reply = reply 362 | continue 363 | 364 | self._receive_stats(out, reply) 365 | 366 | if err_reply: 367 | raise KnotCtlError(err_reply[KnotCtlDataIdx.ERROR], err_reply) 368 | 369 | return out 370 | 371 | def receive_block(self): 372 | """Receives a control answer and returns it as a structured dictionary. 373 | 374 | @rtype: dict 375 | """ 376 | 377 | out = dict() 378 | err_reply = None 379 | 380 | while True: 381 | reply = KnotCtlData() 382 | reply_type = self.receive(reply) 383 | 384 | # Stop if not data type. 385 | if reply_type not in [KnotCtlType.DATA, KnotCtlType.EXTRA]: 386 | break 387 | 388 | # Check for an error. 389 | if reply[KnotCtlDataIdx.ERROR]: 390 | err_reply = reply 391 | continue 392 | 393 | # Check for config data. 394 | if reply[KnotCtlDataIdx.SECTION]: 395 | self._receive_conf(out, reply) 396 | # Check for zone data. 397 | elif reply[KnotCtlDataIdx.ZONE]: 398 | if reply[KnotCtlDataIdx.OWNER]: 399 | self._receive_zone(out, reply) 400 | else: 401 | self._receive_zone_status(out, reply) 402 | else: 403 | continue 404 | 405 | if err_reply: 406 | raise KnotCtlError(err_reply[KnotCtlDataIdx.ERROR], err_reply) 407 | 408 | return out 409 | 410 | class KnotCollector(object): 411 | def __init__(self, lib, sock, ttl): 412 | self._lib = lib 413 | self._sock = sock 414 | self._ttl = ttl 415 | 416 | def collect(self): 417 | ctl = KnotCtl(lib_path=self._lib) 418 | ctl.connect(self._sock) 419 | ctl.set_timeout(self._ttl) 420 | 421 | # Get global metrics. 422 | ctl.send_block(cmd="stats", flags="F") 423 | global_stats = ctl.receive_stats() 424 | 425 | for section, section_data in global_stats.items(): 426 | for item, item_data in section_data.items(): 427 | if type(item_data) == dict: 428 | for kind, value in item_data.items(): 429 | kind_sect = kind.lower() 430 | yield GaugeMetricFamily( 431 | (f"knot_{section}_{item}_{kind_sect}").replace('-', '_'), 432 | '', 433 | value 434 | ) 435 | else: 436 | name = ('knot_' + section + '_' + item).replace('-', '_') 437 | yield GaugeMetricFamily(name, '', value=item_data) 438 | 439 | # Get zone metrics. 440 | ctl.send_block(cmd="zone-stats", flags="F") 441 | zone_stats = ctl.receive_stats() 442 | 443 | if "zone" in zone_stats: 444 | for zone, zone_data in zone_stats["zone"].items(): 445 | for section, section_data in zone_data.items(): 446 | for item, item_data in section_data.items(): 447 | for kind, kind_data in item_data.items(): 448 | if kind_data == 0: 449 | continue 450 | 451 | name = ('knot_' + item).replace('-', '_') 452 | m = GaugeMetricFamily(name, '', 453 | labels=['zone', 'section', 'type']) 454 | m.add_metric([zone, section, kind], kind_data) 455 | yield m 456 | 457 | if __name__ == '__main__': 458 | parser = argparse.ArgumentParser( 459 | formatter_class = argparse.ArgumentDefaultsHelpFormatter, 460 | ) 461 | 462 | parser.add_argument( 463 | "--web-listen-addr", 464 | default="127.0.0.1", 465 | help="address on which to expose metrics." 466 | ) 467 | 468 | parser.add_argument( 469 | "--web-listen-port", 470 | type=int, 471 | default=9433, 472 | help="port on which to expose metrics." 473 | ) 474 | 475 | parser.add_argument( 476 | "--knot-library-path", 477 | default="libknot.so", 478 | help="path to libknot." 479 | ) 480 | 481 | parser.add_argument( 482 | "--knot-socket-path", 483 | default="/run/knot/knot.sock", 484 | help="path to knot control socket." 485 | ) 486 | 487 | parser.add_argument( 488 | "--knot-socket-timeout", 489 | type=int, 490 | default=2000, 491 | help="timeout for Knot control socket operations." 492 | ) 493 | 494 | args = parser.parse_args() 495 | 496 | REGISTRY.register(KnotCollector( 497 | args.knot_library_path, 498 | args.knot_socket_path, 499 | args.knot_socket_timeout, 500 | )) 501 | 502 | httpd = http.server.HTTPServer( 503 | (args.web_listen_addr, args.web_listen_port), 504 | MetricsHandler, 505 | ) 506 | 507 | httpd.serve_forever() 508 | -------------------------------------------------------------------------------- /knot_exporter.service: -------------------------------------------------------------------------------- 1 | [Unit] 2 | Description=Prometheus exporter for Knot DNS 3 | Documentation=https://github.com/ghedo/knot_exporter 4 | After=knot.service 5 | Requires=knot.service 6 | 7 | [Service] 8 | Restart=always 9 | User=prometheus 10 | Group=knot 11 | EnvironmentFile=/etc/default/knot_exporter 12 | ExecStart=/usr/bin/knot_exporter $ARGS 13 | TimeoutStopSec=20s 14 | SendSIGKILL=no 15 | 16 | [Install] 17 | WantedBy=multi-user.target 18 | --------------------------------------------------------------------------------