src/chrony.c

   1 /* chrony plugin for collectd
   2    (c) 2015 by Claudius M Zingerli, ZSeng
   3    Internas roughly based on the ntpd plugin
   4    License: GPL2
   5 */
   6 /* TODO:
   7  *      - More robust udp parsing (using offsets instead of structs?)
   8  *      - Plausibility checks on values received
   9  *
  10  *
  11  */
  12
  13 /* getaddrinfo */
  14 #include <sys/types.h>
  15 #include <sys/socket.h>
  16 #include <netdb.h>
  17
  18 #include "collectd.h"
  19 #include "common.h" /* auxiliary functions */
  20 #include "plugin.h" /* plugin_register_*, plugin_dispatch_values */
  21
  22 static const char *g_config_keys[] =
  23 {
  24         "Host",
  25         "Port",
  26         "Timeout"
  27 };
  28
  29 static int g_config_keys_num = STATIC_ARRAY_SIZE (g_config_keys);
  30
  31 # define CHRONY_DEFAULT_HOST "localhost"
  32 # define CHRONY_DEFAULT_PORT "323"
  33 # define CHRONY_DEFAULT_TIMEOUT 2
  34
  35 /* Copied from chrony/candm.h */
  36 /*BEGIN*/
  37 #define PROTO_VERSION_NUMBER 6
  38
  39 #define REQ_N_SOURCES 14
  40 #define REQ_SOURCE_DATA 15
  41 #define REQ_SOURCE_STATS 34
  42
  43 #define PKT_TYPE_CMD_REQUEST 1
  44 #define PKT_TYPE_CMD_REPLY 2
  45
  46 #define RPY_NULL 1
  47 #define RPY_N_SOURCES 2
  48 #define RPY_SOURCE_DATA 3
  49 #define RPY_MANUAL_TIMESTAMP 4
  50 #define RPY_TRACKING 5
  51 #define RPY_SOURCE_STATS 6
  52 #define RPY_RTC 7
  53
  54 #define IPADDR_UNSPEC 0
  55 #define IPADDR_INET4 1
  56 #define IPADDR_INET6 2
  57
  58 #define ATTRIB_PACKED __attribute__((packed))
  59 typedef struct ATTRIB_PACKED
  60 {
  61         int32_t f;
  62 } Float;
  63 /*END*/
  64
  65 typedef enum
  66 {
  67         STT_SUCCESS = 0,
  68         STT_FAILED  = 1,
  69         STT_UNAUTH  = 2,
  70         STT_INVALID = 3,
  71         STT_NOSUCHSOURCE = 4,
  72         STT_INVALIDTS  = 5,
  73         STT_NOTENABLED = 6,
  74         STT_BADSUBNET  = 7,
  75         STT_ACCESSALLOWED = 8,
  76         STT_ACCESSDENIED  = 9,
  77         STT_NOHOSTACCESS  = 10,
  78         STT_SOURCEALREADYKNOWN = 11,
  79         STT_TOOMANYSOURCES = 12,
  80         STT_NORTC      = 13,
  81         STT_BADRTCFILE = 14,
  82         STT_INACTIVE   = 15,
  83         STT_BADSAMPLE  = 16,
  84         STT_INVALIDAF  = 17,
  85         STT_BADPKTVERSION = 18,
  86         STT_BADPKTLENGTH = 19,
  87 } eChrony_Status;
  88
  89 typedef struct ATTRIB_PACKED
  90 {
  91         uint32_t f_n_sources;
  92 } tChrony_N_Sources;
  93
  94 typedef struct ATTRIB_PACKED
  95 {
  96         int32_t f_index;
  97         uint8_t f_dummy0[44];
  98 } tChrony_Req_Source_data;
  99
 100 typedef struct ATTRIB_PACKED
 101 {
 102         int32_t f_index;
 103         uint8_t f_dummy0[56];
 104 } tChrony_Req_Source_stats;
 105
 106 #define IPV6_STR_MAX_SIZE 40
 107 typedef struct ATTRIB_PACKED
 108 {
 109         union
 110         {
 111                 uint32_t ip4;
 112                 uint8_t ip6[16];
 113         } addr;
 114         uint16_t f_family;
 115 } tChrony_IPAddr;
 116
 117 typedef struct ATTRIB_PACKED
 118 {
 119         tChrony_IPAddr addr;
 120         uint16_t dummy; /* FIXME: Strange dummy space. Needed on gcc 4.8.3 on x86_64 */
 121         int16_t  f_poll;
 122         uint16_t f_stratum;
 123         uint16_t f_state;
 124         uint16_t f_mode;
 125         uint16_t f_flags;
 126         uint16_t f_reachability;
 127
 128         uint32_t f_since_sample;
 129         Float f_origin_latest_meas;
 130         Float f_latest_meas;
 131         Float f_latest_meas_err;
 132 } tChrony_Resp_Source_data;
 133
 134 typedef struct ATTRIB_PACKED
 135 {
 136         uint32_t f_ref_id;
 137         tChrony_IPAddr addr;
 138         uint16_t dummy; /* FIXME: Strange dummy space. Needed on gcc 4.8.3 on x86_64 */
 139         uint32_t f_n_samples; //Number of measurements done
 140         uint32_t f_n_runs; //How many measurements to come
 141         uint32_t f_span_seconds; //For how long we're measuring
 142         Float f_rtc_seconds_fast;
 143         Float f_rtc_gain_rate_ppm; //Estimated relative frequency error
 144         Float f_skew_ppm; //Clock skew
 145         Float f_est_offset; //Estimated offset of source
 146         Float f_est_offset_err; //Error of estimation
 147 } tChrony_Resp_Source_stats;
 148
 149
 150 typedef struct ATTRIB_PACKED
 151 {
 152         struct
 153         {
 154                 uint8_t f_version;
 155                 uint8_t f_type;
 156                 uint8_t f_dummy0;
 157                 uint8_t f_dummy1;
 158                 uint16_t f_cmd;
 159                 uint16_t f_cmd_try;
 160                 uint32_t f_seq;
 161
 162                 uint32_t f_dummy2;
 163                 uint32_t f_dummy3;
 164         } header; /* Packed: 20Bytes */
 165         union
 166         {
 167                 tChrony_N_Sources n_sources; /* Packed: 4 Bytes */
 168                 tChrony_Req_Source_data source_data;
 169                 tChrony_Req_Source_stats source_stats;
 170         } body;
 171         uint8_t padding[4+16]; /* Padding to match minimal response size */
 172 } tChrony_Request;
 173
 174 typedef struct ATTRIB_PACKED
 175 {
 176         struct
 177         {
 178                 uint8_t f_version;
 179                 uint8_t f_type;
 180                 uint8_t f_dummy0;
 181                 uint8_t f_dummy1;
 182                 uint16_t f_cmd;
 183                 uint16_t f_reply;
 184                 uint16_t f_status;
 185                 uint16_t f_dummy2;
 186                 uint16_t f_dummy3;
 187                 uint16_t f_dummy4;
 188                 uint32_t f_seq;
 189                 uint32_t f_dummy5;
 190                 uint32_t f_dummy6;
 191         } header; /* Packed: 28 Bytes */
 192
 193         /*uint32_t EOR;*/
 194
 195         union
 196         {
 197                 tChrony_N_Sources n_sources;
 198                 tChrony_Resp_Source_data source_data;
 199                 tChrony_Resp_Source_stats source_stats;
 200         } body;
 201
 202         uint8_t padding[1024];
 203 } tChrony_Response;
 204
 205 static int g_is_connected = 0;
 206 static int g_chrony_socket = -1;
 207 static time_t g_chrony_timeout = 0;
 208 static char *g_chrony_host = NULL;
 209 static char *g_chrony_port = NULL;
 210 static uint32_t g_chrony_seq = 0;
 211
 212 /*****************************************************************************/
 213 /* Internal functions */
 214 /*****************************************************************************/
 215 /* Code from: http://long.ccaba.upc.edu/long/045Guidelines/eva/ipv6.html#daytimeClient6 */
 216 /*BEGIN*/
 217 static int
 218 connect_client (const char *hostname,
 219                 const char *service,
 220                 int         family,
 221                 int         socktype)
 222 {
 223         struct addrinfo hints, *res, *ressave;
 224         int n, sockfd;
 225
 226         memset(&hints, 0, sizeof(struct addrinfo));
 227
 228         hints.ai_family = family;
 229         hints.ai_socktype = socktype;
 230
 231         n = getaddrinfo(hostname, service, &hints, &res);
 232
 233         if (n <0)
 234         {
 235                 ERROR ("chrony plugin: getaddrinfo error:: [%s]", gai_strerror(n));
 236                 return -1;
 237         }
 238
 239         ressave = res;
 240
 241         sockfd=-1;
 242         while (res)
 243         {
 244                 sockfd = socket(res->ai_family,
 245                 res->ai_socktype,
 246                 res->ai_protocol);
 247
 248                 if (!(sockfd < 0))
 249                 {
 250                         if (connect(sockfd, res->ai_addr, res->ai_addrlen) == 0)
 251                         {
 252                                 break;
 253                         }
 254
 255                         close(sockfd);
 256                         sockfd=-1;
 257                 }
 258                 res=res->ai_next;
 259         }
 260
 261         freeaddrinfo(ressave);
 262         return sockfd;
 263 }
 264 /*Code originally from: https://github.com/mlichvar/chrony/blob/master/util.c */
 265 /*char * UTI_IPToString(IPAddr *addr)*/
 266 char * niptoha(const tChrony_IPAddr *addr,char *p_buf, size_t p_buf_size)
 267 {
 268         unsigned long a, b, c, d, ip;
 269         const uint8_t *ip6;
 270
 271         switch (ntohs(addr->f_family))
 272         {
 273         case IPADDR_UNSPEC:
 274                 snprintf(p_buf, p_buf_size, "[UNSPEC]");
 275         break;
 276         case IPADDR_INET4:
 277                 ip = ntohl(addr->addr.ip4);
 278                 a = (ip>>24) & 0xff;
 279                 b = (ip>>16) & 0xff;
 280                 c = (ip>> 8) & 0xff;
 281                 d = (ip>> 0) & 0xff;
 282                 snprintf(p_buf, p_buf_size, "%ld.%ld.%ld.%ld", a, b, c, d);
 283         break;
 284         case IPADDR_INET6:
 285                 ip6 = addr->addr.ip6;
 286 #if 0
 287 /* FIXME: Detect little endian systems */
 288                 snprintf(p_buf, p_buf_size, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x",
 289                         ip6[0], ip6[1], ip6[2], ip6[3], ip6[4], ip6[5], ip6[6], ip6[7],
 290                         ip6[8], ip6[9], ip6[10], ip6[11], ip6[12], ip6[13], ip6[14], ip6[15]);
 291 #else
 292                 snprintf(p_buf, p_buf_size, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x",
 293                         ip6[5], ip6[4], ip6[3], ip6[2], ip6[1], ip6[0], ip6[9], ip6[8],
 294                         ip6[7], ip6[6], ip6[5], ip6[4], ip6[3], ip6[2], ip6[1], ip6[0]);
 295 #endif
 296         break;
 297         default:
 298                 snprintf(p_buf, p_buf_size, "[UNKNOWN]");
 299         }
 300         return p_buf;
 301 }
 302 /*END*/
 303
 304 static int chrony_set_timeout()
 305 {
 306         struct timeval tv;
 307         tv.tv_sec  = g_chrony_timeout;
 308         tv.tv_usec = 0;
 309
 310         assert(g_chrony_socket>=0);
 311         if (setsockopt(g_chrony_socket, SOL_SOCKET, SO_RCVTIMEO, (char *)&tv,sizeof(struct timeval)) < 0)
 312         {
 313                 return (1);
 314         }
 315         return (0);
 316 }
 317
 318 static int chrony_connect()
 319 {
 320         if (g_chrony_host == NULL)
 321         {
 322                 g_chrony_host = strdup(CHRONY_DEFAULT_HOST);
 323         }
 324         if (g_chrony_port == NULL)
 325         {
 326                 g_chrony_port = strdup(CHRONY_DEFAULT_PORT);
 327         }
 328         if (g_chrony_timeout <= 0)
 329         {
 330                 g_chrony_timeout = CHRONY_DEFAULT_TIMEOUT;
 331         }
 332
 333
 334         DEBUG("chrony plugin: Connecting to %s:%s", g_chrony_host, g_chrony_port);
 335         int socket = connect_client(g_chrony_host, g_chrony_port,  AF_UNSPEC, SOCK_DGRAM);
 336         if (socket < 0)
 337         {
 338                 ERROR ("chrony plugin: Error connecting to daemon. Errno = %d", errno);
 339                 return (1);
 340         }
 341         DEBUG("chrony plugin: Connected");
 342         g_chrony_socket = socket;
 343
 344         if (chrony_set_timeout())
 345         {
 346                 ERROR ("chrony plugin: Error setting timeout to %lds. Errno = %d", g_chrony_timeout, errno);
 347                 return (1);
 348         }
 349         return (0);
 350 }
 351
 352 static int chrony_send_request(const tChrony_Request *p_req, size_t p_req_size)
 353 {
 354         if (send(g_chrony_socket,p_req,p_req_size,0) < 0)
 355         {
 356                 ERROR ("chrony plugin: Error sending packet. Errno = %d", errno);
 357                 return (1);
 358         } else {
 359                 return (0);
 360         }
 361 }
 362
 363 static int chrony_recv_response(tChrony_Response *p_resp, size_t p_resp_max_size, size_t *p_resp_size)
 364 {
 365         ssize_t rc = recv(g_chrony_socket,p_resp,p_resp_max_size,0);
 366         if (rc <= 0)
 367         {
 368                 ERROR ("chrony plugin: Error receiving packet. Errno = %d", errno);
 369                 return (1);
 370         } else {
 371 #if 0
 372                 if (rc < p_resp_max_size)
 373                 {
 374                         ERROR ("chrony plugin: Received too small response packet. (Should: %ld, was: %ld)", p_resp_max_size, rc);
 375                         return (1);
 376                 }
 377 #endif
 378                 *p_resp_size = rc;
 379                 return (0);
 380         }
 381 }
 382
 383 static int chrony_query(int p_command, tChrony_Request *p_req, tChrony_Response *p_resp, size_t *p_resp_size)
 384 {
 385         /* Check connection. We simply perform one try as collectd already handles retries */
 386         assert(p_req);
 387         assert(p_resp);
 388         assert(p_resp_size);
 389         if (g_is_connected == 0)
 390         {
 391                 if (chrony_connect() == 0)
 392                 {
 393                         g_is_connected = 1;
 394                 } else {
 395                         ERROR ("chrony plugin: Unable to connect. Errno = %d", errno);
 396                         return 1;
 397                 }
 398         }
 399
 400
 401         do
 402         {
 403                 int valid_command = 0;
 404                 size_t req_size = sizeof(p_req->header) + sizeof(p_req->padding);
 405                 size_t resp_size = sizeof(p_resp->header);
 406                 uint16_t resp_code = RPY_NULL;
 407                 switch (p_command)
 408                 {
 409                 case REQ_N_SOURCES:
 410                         req_size  += sizeof(p_req->body.n_sources);
 411                         resp_size += sizeof(p_resp->body.n_sources);
 412                         resp_code = RPY_N_SOURCES;
 413                         valid_command = 1;
 414                         break;
 415                 case REQ_SOURCE_DATA:
 416                         req_size  += sizeof(p_req->body.source_data);
 417                         resp_size += sizeof(p_resp->body.source_data);
 418                         resp_code = RPY_SOURCE_DATA;
 419                         valid_command = 1;
 420                         break;
 421                 case REQ_SOURCE_STATS:
 422                         req_size  += sizeof(p_req->body.source_stats);
 423                         resp_size += sizeof(p_resp->body.source_stats);
 424                         resp_code = RPY_SOURCE_STATS;
 425                         valid_command = 1;
 426                         break;
 427                 default:
 428                         ERROR ("chrony plugin: Unknown request command (Was: %d)", p_command);
 429                         break;
 430                 }
 431
 432                 if (valid_command == 0)
 433                 {
 434                         break;
 435                 }
 436
 437                 p_req->header.f_cmd     = htons(p_command);
 438                 p_req->header.f_cmd_try = 0;
 439                 p_req->header.f_seq     = htonl(g_chrony_seq++);
 440
 441                 DEBUG("chrony plugin: Sending request");
 442                 if (chrony_send_request(p_req,req_size) != 0)
 443                 {
 444                         break;
 445                 }
 446
 447                 DEBUG("chrony plugin: Waiting for response");
 448                 if (chrony_recv_response(p_resp,resp_size,p_resp_size) != 0)
 449                 {
 450                         break;
 451                 }
 452                 DEBUG("chrony plugin: Received response: .version = %u, .type = %u, .cmd = %u, .reply = %u, .status = %u, .seq = %u",p_resp->header.f_version,p_resp->header.f_type,ntohs(p_resp->header.f_cmd),ntohs(p_resp->header.f_reply),ntohs(p_resp->header.f_status),ntohl(p_resp->header.f_seq));
 453
 454                 if (p_resp->header.f_version != p_req->header.f_version)
 455                 {
 456                         ERROR("chrony plugin: Wrong protocol version (Was: %d, expected: %d)", p_resp->header.f_version, p_req->header.f_version);
 457                         return 1;
 458                 }
 459                 if (p_resp->header.f_type != PKT_TYPE_CMD_REPLY)
 460                 {
 461                         ERROR("chrony plugin: Wrong packet type (Was: %d, expected: %d)", p_resp->header.f_type, PKT_TYPE_CMD_REPLY);
 462                         return 1;
 463                 }
 464                 if (p_resp->header.f_seq != p_req->header.f_seq)
 465                 {
 466                         /* FIXME: Implement sequence number handling */
 467                         ERROR("chrony plugin: Unexpected sequence number (Was: %d, expected: %d)", p_resp->header.f_seq, p_req->header.f_seq);
 468                         return 1;
 469                 }
 470                 if (p_resp->header.f_cmd != p_req->header.f_cmd)
 471                 {
 472                         ERROR("chrony plugin: Wrong reply command (Was: %d, expected: %d)", p_resp->header.f_cmd, p_req->header.f_cmd);
 473                         return 1;
 474                 }
 475
 476                 if (ntohs(p_resp->header.f_reply) !=  resp_code)
 477                 {
 478                         ERROR("chrony plugin: Wrong reply code (Was: %d, expected: %d)", ntohs(p_resp->header.f_reply), p_command);
 479                         return 1;
 480                 }
 481
 482                 switch (p_resp->header.f_status)
 483                 {
 484                 case STT_SUCCESS:
 485                         DEBUG("chrony plugin: Reply packet status STT_SUCCESS");
 486                         break;
 487                 default:
 488                         ERROR("chrony plugin: Reply packet contains error status: %d (expected: %d)", p_resp->header.f_status, STT_SUCCESS);
 489                         return (1);
 490                 }
 491                 return (0);
 492         } while (0);
 493
 494         return (1);
 495 }
 496
 497 static void chrony_init_req(tChrony_Request *p_req)
 498 {
 499         DEBUG("chrony plugin: Clearing %ld bytes",sizeof(*p_req));
 500         memset(p_req,0,sizeof(*p_req));
 501         p_req->header.f_version = PROTO_VERSION_NUMBER;
 502         p_req->header.f_type    = PKT_TYPE_CMD_REQUEST;
 503         p_req->header.f_dummy0  = 0;
 504         p_req->header.f_dummy1  = 0;
 505         p_req->header.f_dummy2  = 0;
 506         p_req->header.f_dummy3  = 0;
 507 }
 508
 509 /* Code from: https://github.com/mlichvar/chrony/blob/master/util.c (GPLv2) */
 510 /*BEGIN*/
 511 #define FLOAT_EXP_BITS 7
 512 #define FLOAT_EXP_MIN (-(1 << (FLOAT_EXP_BITS - 1)))
 513 #define FLOAT_EXP_MAX (-FLOAT_EXP_MIN - 1)
 514 #define FLOAT_COEF_BITS ((int)sizeof (int32_t) * 8 - FLOAT_EXP_BITS)
 515 #define FLOAT_COEF_MIN (-(1 << (FLOAT_COEF_BITS - 1)))
 516 #define FLOAT_COEF_MAX (-FLOAT_COEF_MIN - 1)
 517
 518 /* double UTI_FloatNetworkToHost(Float f) */
 519 double ntohf(Float f)
 520 {
 521   int32_t exp, coef, x;
 522
 523   x = ntohl(f.f);
 524   exp = (x >> FLOAT_COEF_BITS) - FLOAT_COEF_BITS;
 525   coef = x << FLOAT_EXP_BITS >> FLOAT_EXP_BITS;
 526   return coef * pow(2.0, exp);
 527 }
 528 /*END*/
 529
 530 /* Code from: collectd/src/ntpd.c (MIT) */
 531 /*BEGIN*/
 532 static void chrony_push_data(char *type, char *type_inst, double value)
 533 {
 534         value_t values[1];
 535         value_list_t vl = VALUE_LIST_INIT;
 536
 537         values[0].gauge = value;
 538
 539         vl.values = values;
 540         vl.values_len = 1;
 541         sstrncpy (vl.host, hostname_g, sizeof (vl.host));
 542         sstrncpy (vl.plugin, "chrony", sizeof (vl.plugin));
 543         sstrncpy (vl.plugin_instance, "", sizeof (vl.plugin_instance));
 544         sstrncpy (vl.type, type, sizeof (vl.type));
 545         sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
 546
 547         plugin_dispatch_values (&vl);
 548 }
 549 /*END*/
 550
 551 /*****************************************************************************/
 552 /* Exported functions */
 553 /*****************************************************************************/
 554 static int chrony_config(const char *p_key, const char *p_value)
 555 {
 556         assert(p_key);
 557         assert(p_value);
 558         /* Parse config variables */
 559         if (strcasecmp(p_key, "Host") == 0)
 560         {
 561                 if (g_chrony_host != NULL)
 562                 {
 563                         free (g_chrony_host);
 564                 }
 565                 if ((g_chrony_host = strdup (p_value)) == NULL)
 566                 {
 567                         ERROR ("chrony plugin: Error duplicating host name");
 568                         return (1);
 569                 }
 570         } else if (strcasecmp(p_key, "Port") == 0)
 571         {
 572                 if (g_chrony_port != NULL)
 573                 {
 574                         free (g_chrony_port);
 575                 }
 576                 if ((g_chrony_port = strdup (p_value)) == NULL)
 577                 {
 578                         ERROR ("chrony plugin: Error duplicating port name");
 579                         return (1);
 580                 }
 581         } else if (strcasecmp(p_key, "Timeout") == 0)
 582         {
 583                 time_t tosec = strtol(p_value,NULL,0);
 584                 g_chrony_timeout = tosec;
 585         } else {
 586                 WARNING("chrony plugin: Unknown configuration variable: %s %s",p_key,p_value);
 587                 return (1);
 588         }
 589         return (0);
 590 }
 591
 592 static int chrony_read (void)
 593 {
 594         int status,now_src;
 595         char ip_addr_str0[ IPV6_STR_MAX_SIZE];
 596         char ip_addr_str1[IPV6_STR_MAX_SIZE];
 597
 598         size_t chrony_resp_size;
 599         tChrony_Request  chrony_req,chrony_req1;
 600         tChrony_Response chrony_resp,chrony_resp1;
 601
 602         DEBUG("chrony plugin: Requesting data");
 603         chrony_init_req(&chrony_req);
 604         status = chrony_query (REQ_N_SOURCES, &chrony_req, &chrony_resp, &chrony_resp_size);
 605         if (status != 0)
 606         {
 607                 ERROR ("chrony plugin: chrony_query (REQ_N_SOURCES) failed with status %i", status);
 608                 return (status);
 609         }
 610
 611         int n_sources = ntohl(chrony_resp.body.n_sources.f_n_sources);
 612         DEBUG("chrony plugin: Getting data of %d clock sources", n_sources);
 613
 614         for (now_src = 0; now_src < n_sources; ++now_src)
 615         {
 616                 chrony_init_req(&chrony_req);
 617                 chrony_init_req(&chrony_req1);
 618                 chrony_req.body.source_data.f_index = htonl(now_src);
 619                 chrony_req1.body.source_stats.f_index = htonl(now_src);
 620                 status = chrony_query(REQ_SOURCE_DATA, &chrony_req, &chrony_resp, &chrony_resp_size);
 621                 if (status != 0)
 622                 {
 623                         ERROR ("chrony plugin: chrony_query (REQ_SOURCE_DATA) failed with status %i", status);
 624                         return (status);
 625                 }
 626                 status = chrony_query(REQ_SOURCE_STATS, &chrony_req1, &chrony_resp1, &chrony_resp_size);
 627                 if (status != 0)
 628                 {
 629                         ERROR ("chrony plugin: chrony_query (REQ_SOURCE_STATS) failed with status %i", status);
 630                         return (status);
 631                 }
 632                 memset(ip_addr_str0,0,sizeof(ip_addr_str0));
 633                 niptoha(&chrony_resp.body.source_data.addr,ip_addr_str0,sizeof(ip_addr_str0));
 634                 DEBUG("chrony plugin: Source[%d] data: .addr = %s, .poll = %u, .stratum = %u, .state = %u, .mode = %u, .flags = %u, .reach = %u, .latest_meas_ago = %u, .orig_latest_meas = %f, .latest_meas = %f, .latest_meas_err = %f",
 635                         now_src,
 636                         ip_addr_str0,
 637                         ntohs(chrony_resp.body.source_data.f_poll),
 638                         ntohs(chrony_resp.body.source_data.f_stratum),
 639                         ntohs(chrony_resp.body.source_data.f_state),
 640                         ntohs(chrony_resp.body.source_data.f_mode),
 641                         ntohs(chrony_resp.body.source_data.f_flags),
 642                         ntohs(chrony_resp.body.source_data.f_reachability),
 643                         ntohl(chrony_resp.body.source_data.f_since_sample),
 644                         ntohf(chrony_resp.body.source_data.f_origin_latest_meas),
 645                         ntohf(chrony_resp.body.source_data.f_latest_meas),
 646                         ntohf(chrony_resp.body.source_data.f_latest_meas_err));
 647 #if 1
 648                 memset(ip_addr_str1,0,sizeof(ip_addr_str1));
 649                 niptoha(&chrony_resp1.body.source_stats.addr,ip_addr_str1,sizeof(ip_addr_str1));
 650                 DEBUG("chrony plugin: Source[%d] stat: .addr = %s, .ref_id= %u, .n_samples = %u, .n_runs = %u, .span_seconds = %u, .rtc_seconds_fast = %f, .rtc_gain_rate_ppm = %f, .skew_ppm= %f, .est_offset = %f, .est_offset_err = %f",
 651                         now_src,
 652                         ip_addr_str1,
 653                         ntohl(chrony_resp1.body.source_stats.f_ref_id),
 654                         ntohl(chrony_resp1.body.source_stats.f_n_samples),
 655                         ntohl(chrony_resp1.body.source_stats.f_n_runs),
 656                         ntohl(chrony_resp1.body.source_stats.f_span_seconds),
 657                         ntohf(chrony_resp1.body.source_stats.f_rtc_seconds_fast),
 658                         ntohf(chrony_resp1.body.source_stats.f_rtc_gain_rate_ppm),
 659                         ntohf(chrony_resp1.body.source_stats.f_skew_ppm),
 660                         ntohf(chrony_resp1.body.source_stats.f_est_offset),
 661                         ntohf(chrony_resp1.body.source_stats.f_est_offset_err));
 662 #endif
 663 #if 1
 664                 chrony_push_data("clock_stratum",     ip_addr_str0,ntohs(chrony_resp.body.source_data.f_stratum));
 665                 chrony_push_data("clock_state",       ip_addr_str0,ntohs(chrony_resp.body.source_data.f_state));
 666                 chrony_push_data("clock_mode",        ip_addr_str0,ntohs(chrony_resp.body.source_data.f_mode));
 667                 chrony_push_data("clock_reachability",ip_addr_str0,ntohs(chrony_resp.body.source_data.f_reachability));
 668                 chrony_push_data("clock_last_meas",   ip_addr_str0,ntohs(chrony_resp.body.source_data.f_since_sample));
 669                 chrony_push_data("clock_skew_ppm",    ip_addr_str1,ntohf(chrony_resp1.body.source_stats.f_skew_ppm));
 670                 chrony_push_data("frequency_error",   ip_addr_str1,ntohf(chrony_resp1.body.source_stats.f_rtc_gain_rate_ppm)); /* unit: ppm */
 671                 chrony_push_data("time_offset",       ip_addr_str1,ntohf(chrony_resp1.body.source_stats.f_est_offset)); /* unit: s */
 672 #endif
 673         }
 674         return (0);
 675 }
 676
 677 static int chrony_shutdown()
 678 {
 679         if (g_is_connected != 0)
 680         {
 681                 close(g_chrony_socket);
 682                 g_is_connected = 0;
 683         }
 684         if (g_chrony_host != NULL)
 685         {
 686                 free (g_chrony_host);
 687                 g_chrony_host = NULL;
 688         }
 689         if (g_chrony_port != NULL)
 690         {
 691                 free (g_chrony_port);
 692                 g_chrony_port = NULL;
 693         }
 694         return (0);
 695 }
 696
 697 void module_register (void)
 698 {
 699         plugin_register_config ("chrony", chrony_config, g_config_keys, g_config_keys_num);
 700         plugin_register_read ("chrony", chrony_read);
 701         plugin_register_shutdown ("chrony", chrony_shutdown);
 702 }