src/server/server.c

   1 /*
   2  * Copyright (C) 2010-2014 jeanfi@gmail.com
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301 USA
  18  */
  19 #define _LARGEFILE_SOURCE 1
  20 #include "config.h"
  21
  22 #include <locale.h>
  23 #include <libintl.h>
  24 #define _(str) gettext(str)
  25
  26 #include <limits.h>
  27 #include <stdarg.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <sys/stat.h>
  32 #include <sys/types.h>
  33 #include <sys/select.h>
  34 #include <sys/socket.h>
  35 #include <getopt.h>
  36 #include <stdint.h>
  37 #include <pthread.h>
  38 #include <unistd.h>
  39 #include <microhttpd.h>
  40
  41 #ifdef HAVE_GTOP
  42 #include "sysinfo.h"
  43 #include <pgtop2.h>
  44 #endif
  45
  46 #include <hdd.h>
  47 #include <lmsensor.h>
  48 #include <plog.h>
  49 #include "psensor_json.h"
  50 #include <pmutex.h>
  51 #include "url.h"
  52 #include "server.h"
  53 #include "slog.h"
  54
  55 static const char *DEFAULT_LOG_FILE = "/var/log/psensor-server.log";
  56
  57 #define HTML_STOP_REQUESTED \
  58 (_("<html><body><p>Server stop requested</p></body></html>"))
  59
  60 static const char *program_name;
  61
  62 static const int DEFAULT_PORT = 3131;
  63
  64 #define PAGE_NOT_FOUND (_("<html><body><p>"\
  65 "Page not found - Go to <a href='/'>Main page</a></p></body>"))
  66
  67 static struct option long_options[] = {
  68         {"version", no_argument, NULL, 'v'},
  69         {"help", no_argument, NULL, 'h'},
  70         {"port", required_argument, NULL, 'p'},
  71         {"wdir", required_argument, NULL, 'w'},
  72         {"debug", required_argument, NULL, 'd'},
  73         {"log-file", required_argument, NULL, 'l'},
  74         {"sensor-log-file", required_argument, NULL, 0},
  75         {"sensor-log-interval", required_argument, NULL, 0},
  76         {NULL, 0, NULL, 0}
  77 };
  78
  79 static struct server_data server_data;
  80
  81 static pthread_mutex_t mutex;
  82
  83 static int server_stop_requested;
  84
  85 static void print_version(void)
  86 {
  87         printf("psensor-server %s\n", VERSION);
  88         printf(_("Copyright (C) %s jeanfi@gmail.com\n"
  89                  "License GPLv2: GNU GPL version 2 or later "
  90                  "<http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>\n"
  91                  "This is free software: you are free to change and redistribute it.\n"
  92                  "There is NO WARRANTY, to the extent permitted by law.\n"),
  93                "2010-2012");
  94 }
  95
  96 static void print_help(void)
  97 {
  98         printf(_("Usage: %s [OPTION]...\n"), program_name);
  99
 100         puts(_("psensor-server is an HTTP server for monitoring hardware "
 101                "sensors remotely."));
 102
 103         puts("");
 104         puts("Options:");
 105         puts(_("  -h, --help            display this help and exit\n"
 106                "  -v, --version         display version information and exit"));
 107
 108         puts("");
 109         puts(_("  -p,--port=PORT        webserver port\n"
 110                "  -w,--wdir=DIR         directory containing webserver pages"));
 111
 112         puts("");
 113         puts(_("  -d, --debug=LEVEL     "
 114                "set the debug level, integer between 0 and 3"));
 115         puts(_("  -l, --log-file=PATH   set the log file to PATH"));
 116         puts(_("  --sensor-log-file=PATH set the sensor log file to PATH"));
 117         puts(_("  --sensor-log-interval=S "
 118                "set the sensor log interval to S (seconds)"));
 119
 120         puts("");
 121         printf(_("Report bugs to: %s\n"), PACKAGE_BUGREPORT);
 122         puts("");
 123         printf(_("%s home page: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
 124 }
 125
 126 /*
 127  * Returns the file path corresponding to a given URL
 128  */
 129 static char *get_path(const char *url, const char *www_dir)
 130 {
 131         const char *p;
 132         char *res;
 133
 134         if (!strlen(url) || !strcmp(url, ".") || !strcmp(url, "/"))
 135                 p = "/index.html";
 136         else
 137                 p = url;
 138
 139         res = malloc(strlen(www_dir)+strlen(p)+1);
 140
 141         strcpy(res, www_dir);
 142         strcat(res, p);
 143
 144         return res;
 145 }
 146
 147 #if MHD_VERSION >= 0x00090200
 148 static ssize_t
 149 file_reader(void *cls, uint64_t pos, char *buf, size_t max)
 150 #else
 151 static int
 152 file_reader(void *cls, uint64_t pos, char *buf, int max)
 153 #endif
 154 {
 155         FILE *file = cls;
 156
 157         fseeko(file, pos, SEEK_SET);
 158         return fread(buf, 1, max, file);
 159 }
 160
 161 static struct MHD_Response *
 162 create_response_api(const char *nurl, const char *method, unsigned int *rp_code)
 163 {
 164         struct MHD_Response *resp;
 165         struct psensor *s;
 166         char *page = NULL;
 167
 168         if (!strcmp(nurl, URL_BASE_API_1_1_SENSORS))  {
 169                 page = sensors_to_json_string(server_data.sensors);
 170 #ifdef HAVE_GTOP
 171         } else if (!strcmp(nurl, URL_API_1_1_SYSINFO)) {
 172                 page = sysinfo_to_json_string(&server_data.psysinfo);
 173         } else if (!strcmp(nurl, URL_API_1_1_CPU_USAGE)) {
 174                 page = sensor_to_json_string(server_data.cpu_usage);
 175 #endif
 176         } else if (!strncmp(nurl, URL_BASE_API_1_1_SENSORS,
 177                             strlen(URL_BASE_API_1_1_SENSORS))
 178                    && nurl[strlen(URL_BASE_API_1_1_SENSORS)] == '/') {
 179
 180                 const char *sid = nurl + strlen(URL_BASE_API_1_1_SENSORS) + 1;
 181
 182                 s = psensor_list_get_by_id(server_data.sensors, sid);
 183
 184                 if (s)
 185                         page = sensor_to_json_string(s);
 186
 187         } else if (!strcmp(nurl, URL_API_1_1_SERVER_STOP)) {
 188
 189                 server_stop_requested = 1;
 190                 page = strdup(HTML_STOP_REQUESTED);
 191         }
 192
 193         if (page) {
 194                 *rp_code = MHD_HTTP_OK;
 195
 196                 resp = MHD_create_response_from_data(strlen(page), page,
 197                                                      MHD_YES, MHD_NO);
 198
 199                 MHD_add_response_header(resp, MHD_HTTP_HEADER_CONTENT_TYPE,
 200                                         "application/json");
 201
 202                 return resp;
 203         }
 204
 205         return NULL;
 206 }
 207
 208 static struct MHD_Response *create_response_file(const char *nurl,
 209                                                  const char *method,
 210                                                  unsigned int *rp_code,
 211                                                  const char *fpath)
 212 {
 213         struct stat st;
 214         int ret;
 215         FILE *file;
 216
 217         ret = stat(fpath, &st);
 218
 219         if (!ret && (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))) {
 220                 file = fopen(fpath, "rb");
 221
 222                 if (file) {
 223                         *rp_code = MHD_HTTP_OK;
 224
 225                         if (!st.st_size) {
 226                                 fclose(file);
 227                                 return MHD_create_response_from_data
 228                                         (0, NULL, MHD_NO, MHD_NO);
 229                         }
 230
 231                         return MHD_create_response_from_callback
 232                                 (st.st_size,
 233                                  32 * 1024,
 234                                  &file_reader,
 235                                  file,
 236                                  (MHD_ContentReaderFreeCallback)&fclose);
 237
 238                 } else {
 239                         log_err("Failed to open: %s.", fpath);
 240                 }
 241         }
 242
 243         return NULL;
 244 }
 245
 246 static struct MHD_Response *
 247 create_response(const char *nurl, const char *method, unsigned int *rp_code)
 248 {
 249         char *page, *fpath, *rpath;
 250         struct MHD_Response *resp = NULL;
 251         int n;
 252
 253         if (!strncmp(nurl, URL_BASE_API_1_1, strlen(URL_BASE_API_1_1))) {
 254                 resp = create_response_api(nurl, method, rp_code);
 255         } else {
 256                 fpath = get_path(nurl, server_data.www_dir);
 257
 258                 rpath = realpath(fpath, NULL);
 259                 if (rpath) {
 260                         n = strlen(server_data.www_dir);
 261                         if (!strncmp(server_data.www_dir, rpath, n))
 262                                 resp = create_response_file(nurl,
 263                                                             method,
 264                                                             rp_code,
 265                                                             fpath);
 266                         free(rpath);
 267                 }
 268
 269                 free(fpath);
 270         }
 271
 272         if (resp)
 273                 return resp;
 274
 275         page = strdup(PAGE_NOT_FOUND);
 276         *rp_code = MHD_HTTP_NOT_FOUND;
 277
 278         return MHD_create_response_from_data(strlen(page),
 279                                              page,
 280                                              MHD_YES,
 281                                              MHD_NO);
 282 }
 283
 284 static int cbk_http_request(void *cls,
 285                             struct MHD_Connection *connection,
 286                             const char *url,
 287                             const char *method,
 288                             const char *version,
 289                             const char *upload_data,
 290                             size_t *upload_data_size,
 291                             void **ptr)
 292 {
 293         static int dummy;
 294         struct MHD_Response *response;
 295         int ret;
 296         char *nurl;
 297         unsigned int resp_code;
 298
 299         if (strcmp(method, "GET"))
 300                 return MHD_NO;
 301
 302         if (&dummy != *ptr) {
 303                 /* The first time only the headers are valid, do not
 304                    respond in the first round... */
 305                 *ptr = &dummy;
 306                 return MHD_YES;
 307         }
 308
 309         if (*upload_data_size)
 310                 return MHD_NO;
 311
 312         *ptr = NULL;            /* clear context pointer */
 313
 314         log_debug(_("HTTP Request: %s"), url);
 315
 316         nurl = url_normalize(url);
 317
 318         pmutex_lock(&mutex);
 319         response = create_response(nurl, method, &resp_code);
 320         pmutex_unlock(&mutex);
 321
 322         ret = MHD_queue_response(connection, resp_code, response);
 323         MHD_destroy_response(response);
 324
 325         free(nurl);
 326
 327         return ret;
 328 }
 329
 330 int main(int argc, char *argv[])
 331 {
 332         struct MHD_Daemon *d;
 333         int port, opti, optc, cmdok, ret, slog_interval;
 334         char *log_file, *slog_file;
 335
 336         program_name = argv[0];
 337
 338         setlocale(LC_ALL, "");
 339
 340 #if ENABLE_NLS
 341         bindtextdomain(PACKAGE, LOCALEDIR);
 342         textdomain(PACKAGE);
 343 #endif
 344
 345         server_data.www_dir = NULL;
 346 #ifdef HAVE_GTOP
 347         server_data.psysinfo.interfaces = NULL;
 348 #endif
 349         log_file = NULL;
 350         slog_file = NULL;
 351         slog_interval = 300;
 352         port = DEFAULT_PORT;
 353         cmdok = 1;
 354
 355         while ((optc = getopt_long(argc,
 356                                    argv,
 357                                    "vhp:w:d:l:",
 358                                    long_options,
 359                                    &opti)) != -1) {
 360                 switch (optc) {
 361                 case 'w':
 362                         if (optarg)
 363                                 server_data.www_dir = realpath(optarg, NULL);
 364                         break;
 365                 case 'p':
 366                         if (optarg)
 367                                 port = atoi(optarg);
 368                         break;
 369                 case 'h':
 370                         print_help();
 371                         exit(EXIT_SUCCESS);
 372                 case 'v':
 373                         print_version();
 374                         exit(EXIT_SUCCESS);
 375                 case 'd':
 376                         log_level = atoi(optarg);
 377                         log_info(_("Enables debug mode: %d"), log_level);
 378                         break;
 379                 case 'l':
 380                         if (optarg)
 381                                 log_file = strdup(optarg);
 382                         break;
 383                 case 0:
 384                         if (!strcmp(long_options[opti].name, "sensor-log-file"))
 385                                 slog_file = strdup(optarg);
 386                         else if (!strcmp(long_options[opti].name,
 387                                          "sensor-log-interval"))
 388                                 slog_interval = atoi(optarg);
 389                         break;
 390                 default:
 391                         cmdok = 0;
 392                         break;
 393                 }
 394         }
 395
 396         if (!cmdok || optind != argc) {
 397                 fprintf(stderr, _("Try `%s --help' for more information.\n"),
 398                         program_name);
 399                 exit(EXIT_FAILURE);
 400         }
 401
 402         if (!server_data.www_dir) {
 403                 server_data.www_dir = realpath(DEFAULT_WWW_DIR, NULL);
 404                 if (!server_data.www_dir) {
 405                         fprintf(stderr,
 406                                 _("Webserver directory does not exist.\n"));
 407                         exit(EXIT_FAILURE);
 408                 }
 409         }
 410
 411         if (!log_file)
 412                 log_file = strdup(DEFAULT_LOG_FILE);
 413
 414         pmutex_init(&mutex);
 415
 416         log_open(log_file);
 417
 418         hddtemp_psensor_list_append(&server_data.sensors, 600);
 419
 420         lmsensor_psensor_list_append(&server_data.sensors, 600);
 421
 422 #ifdef HAVE_GTOP
 423         server_data.cpu_usage = create_cpu_usage_sensor(600);
 424 #endif
 425
 426         if (!*server_data.sensors)
 427                 log_err(_("No sensors detected."));
 428
 429         d = MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION,
 430                              port,
 431                              NULL, NULL, &cbk_http_request, server_data.sensors,
 432                              MHD_OPTION_END);
 433         if (!d) {
 434                 log_err(_("Failed to create Web server."));
 435                 exit(EXIT_FAILURE);
 436         }
 437
 438         log_info(_("Web server started on port: %d"), port);
 439         log_info(_("WWW directory: %s"), server_data.www_dir);
 440         log_info(_("URL: http://localhost:%d"), port);
 441
 442         if (slog_file) {
 443                 if (slog_interval <= 0)
 444                         slog_interval = 300;
 445                 ret = slog_activate(slog_file,
 446                                     server_data.sensors,
 447                                     &mutex,
 448                                     slog_interval);
 449                 if (!ret)
 450                         log_err(_("Failed to activate logging of sensors."));
 451         }
 452
 453         while (!server_stop_requested) {
 454                 pmutex_lock(&mutex);
 455
 456 #ifdef HAVE_GTOP
 457                 sysinfo_update(&server_data.psysinfo);
 458                 cpu_usage_sensor_update(server_data.cpu_usage);
 459 #endif
 460
 461 #ifdef HAVE_ATASMART
 462                 atasmart_psensor_list_update(server_data.sensors);
 463 #endif
 464
 465                 hddtemp_psensor_list_update(server_data.sensors);
 466
 467                 lmsensor_psensor_list_update(server_data.sensors);
 468
 469                 psensor_log_measures(server_data.sensors);
 470
 471                 pmutex_unlock(&mutex);
 472                 sleep(5);
 473         }
 474
 475         slog_close();
 476
 477         MHD_stop_daemon(d);
 478
 479         /* sanity cleanup for valgrind */
 480         psensor_list_free(server_data.sensors);
 481 #ifdef HAVE_GTOP
 482         psensor_free(server_data.cpu_usage);
 483 #endif
 484         free(server_data.www_dir);
 485         lmsensor_cleanup();
 486
 487 #ifdef HAVE_GTOP
 488         sysinfo_cleanup();
 489 #endif
 490
 491         if (log_file != DEFAULT_LOG_FILE)
 492                 free(log_file);
 493
 494         return EXIT_SUCCESS;
 495 }