aboutsummaryrefslogtreecommitdiffstats
path: root/hicn-light/src/command_line/daemon/hicnLightDaemon_main.c
blob: f6d52171161ec89f3c985a716d8839d63e224080 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
/*
 * Copyright (c) 2017-2019 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <errno.h>
#include <fcntl.h>
#include <src/config.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/stat.h>
#include <unistd.h>

#include <parc/algol/parc_FileOutputStream.h>
#include <parc/logging/parc_LogLevel.h>
#include <parc/logging/parc_LogReporterFile.h>
#include <parc/logging/parc_LogReporterTextStdout.h>

#include <parc/assert/parc_Assert.h>

#include <src/core/dispatcher.h>
#include <src/core/forwarder.h>

static void _displayForwarderLogo(void){
  const char cli_banner [] =
  "\033[0;31m   ____ ___      _       \033[0m  __    _               __ _        __   __\n"
  "\033[0;31m  / __// _ \\    (_)___  \033[0m  / /   (_)____ ___ ____/ /(_)___ _ / /  / /_\n"
  "\033[0;31m / _/ / // /_  / // _ \\ \033[0m / _ \\ / // __// _ \\___/ // // _ `// _ \\/ __/\n"
  "\033[0;31m/_/  /____/(_)/_/ \\___/ \033[0m/_//_//_/ \\__//_//_/  /_//_/ \\_, //_//_/\\__/\n"
  "                                                    /___/            \n";
  printf("%s", cli_banner);
  printf("\n");
}

static void _usage(int exitCode) {
  printf(
      "Usage: daemon [--port port] [--daemon] [--capacity objectStoreSize] "
      "[--log facility=level] [--log-file filename] [--config file]\n");
  printf("\n");
  printf(
      "hicn-light run as a daemon is the program to launch the forwarder, "
      "either as a console program\n");
  printf(
      "or a background daemon (detatched from console).  Once running, use the "
      "program controller to\n");
  printf("configure hicn-light.\n");
  printf("\n");
  printf(
      "The configuration file contains configuration lines as per "
      "controller\n");
  printf(
      "If logging level or content store capacity is set in the configuraiton "
      "file, it overrides the command_line\n");
  printf(
      "When a configuration file is specified, no default listeners on 'port' "
      "are setup.  Only 'add listener' lines\n");
  printf("in the configuration file matter.\n");
  printf("\n");
  printf(
      "If no configuration file is specified, daemon will listen on TCP and "
      "UDP ports specified by\n");
  printf(
      "the --port flag (or default port).  It will listen on both IPv4 and "
      "IPv6 if available.\n");
  printf("\n");
  printf("Options:\n");
  printf("--port            = tcp port for in-bound connections\n");
  printf("--daemon          = start as daemon process\n");
  printf("--objectStoreSize = maximum number of content objects to cache\n");
  printf(
      "--log             = sets a facility to a given log level.  You can have "
      "multiple of these.\n");
  printf(
      "                    facilities: all, config, core, io, message, "
      "processor\n");
  printf(
      "                    levels: debug, info, notice, warning, error, "
      "critical, alert, off\n");
  printf("                    example: daemon --log io=debug --log core=off\n");
  printf(
      "--log-file        = file to write log messages to (required in daemon "
      "mode)\n");
  printf("--config           = configuration filename\n");
  printf("\n");
  exit(exitCode);
}

static void _setLogLevelToLevel(int logLevelArray[LoggerFacility_END],
                                LoggerFacility facility,
                                const char *levelString) {
  PARCLogLevel level = parcLogLevel_FromString(levelString);

  if (level < PARCLogLevel_All) {
    // we have a good facility and level
    logLevelArray[facility] = level;
  } else {
    printf("Invalid log level string %s\n", levelString);
    _usage(EXIT_FAILURE);
  }
}

/**
 * string: "facility=level"
 * Set the right thing in the logger
 */
static void _setLogLevel(int logLevelArray[LoggerFacility_END],
                         const char *string) {
  char *tofree = parcMemory_StringDuplicate(string, strlen(string));
  char *p = tofree;

  char *facilityString = strsep(&p, "=");
  if (facilityString) {
    char *levelString = p;

    if (strcasecmp(facilityString, "all") == 0) {
      for (LoggerFacility facility = 0; facility < LoggerFacility_END;
           facility++) {
        _setLogLevelToLevel(logLevelArray, facility, levelString);
      }
    } else {
      LoggerFacility facility;
      for (facility = 0; facility < LoggerFacility_END; facility++) {
        if (strcasecmp(facilityString, logger_FacilityString(facility)) == 0) {
          break;
        }
      }

      if (facility < LoggerFacility_END) {
        _setLogLevelToLevel(logLevelArray, facility, levelString);
      } else {
        printf("Invalid facility string %s\n", facilityString);
        _usage(EXIT_FAILURE);
      }
    }
  }

  parcMemory_Deallocate((void **)&tofree);
}

static void _daemonize(void) {
  if (getppid() == 1) {
    // already a daemon
    return;
  }

  int forkReturn = fork();
  parcTrapUnexpectedStateIf(forkReturn < 0, "Fork error");

  if (forkReturn > 0) {
    // parent exits
    exit(EXIT_SUCCESS);
  }

  // Child daemon detaches
  printf("child continuing, pid = %u\n", getpid());

  // get a new process group independent from old parent
  setsid();

  /* close all descriptors */
  for (int i = getdtablesize(); i >= 0; --i) {
    close(i);
  }

  // reset errno because it might be seg to EBADF from the close calls above
  errno = 0;

  // Redirect stdin and stdout and stderr to /dev/null
  const char *devnull = "/dev/null";
  int nullfile = open(devnull, O_RDWR);
  parcAssertTrue(nullfile >= 0, "Error opening file '%s': (%d) %s", devnull,
                 errno, strerror(errno));

  int ret;
  ret = dup(nullfile);
  parcAssertTrue(ret == 1, "Error duping fd 1 got %d file: (%d) %s", ret, errno,
                 strerror(errno));
  ret = dup(nullfile);
  parcAssertTrue(ret == 2, "Error duping fd 2, got %d file: (%d) %s", ret,
                 errno, strerror(errno));

  // forwarder will capture signals
}

static Logger *_createLogfile(const char *logfile) {
  int logfd = open(logfile, O_WRONLY | O_APPEND | O_CREAT, S_IWUSR | S_IRUSR);
  if (logfd < 0) {
    fprintf(stderr, "Error opening %s for writing: (%d) %s\n", logfile, errno,
            strerror(errno));
    exit(EXIT_FAILURE);
  }

  chmod(logfile, S_IRWXU);

  PARCFileOutputStream *fos = parcFileOutputStream_Create(logfd);
  PARCOutputStream *pos = parcFileOutputStream_AsOutputStream(fos);
  PARCLogReporter *reporter = parcLogReporterFile_Create(pos);

  Logger *logger = logger_Create(reporter, parcClock_Wallclock());

  parcOutputStream_Release(&pos);
  parcLogReporter_Release(&reporter);

  return logger;
}

int main(int argc, const char *argv[]) {
  _displayForwarderLogo();

  uint16_t port = PORT_NUMBER;
  uint16_t configurationPort = 2001;
  bool daemon = false;
  int capacity = -1;
  const char *configFileName = NULL;

  char *logfile = NULL;

  if (argc == 2 && strcasecmp(argv[1], "-h") == 0) {
    _usage(EXIT_SUCCESS);
  }

  int logLevelArray[LoggerFacility_END];
  for (int i = 0; i < LoggerFacility_END; i++) {
    logLevelArray[i] = -1;
  }

  for (int i = 0; i < argc; i++) {
    if (argv[i][0] == '-') {
      if (strcmp(argv[i], "--config") == 0) {
        configFileName = argv[i + 1];
        i++;
      } else if (strcmp(argv[i], "--port") == 0) {
        port = atoi(argv[i + 1]);
        i++;
      } else if (strcmp(argv[i], "--daemon") == 0) {
        daemon = true;
      } else if (strcmp(argv[i], "--capacity") == 0 ||
                 strcmp(argv[i], "-c") == 0) {
        capacity = atoi(argv[i + 1]);
        i++;
      } else if (strcmp(argv[i], "--log") == 0) {
        _setLogLevel(logLevelArray, argv[i + 1]);
        i++;
      } else if (strcmp(argv[i], "--log-file") == 0) {
        if (logfile) {
          // error cannot repeat
          fprintf(stderr, "Cannot specify --log-file more than once\n");
          _usage(EXIT_FAILURE);
        }

        logfile = parcMemory_StringDuplicate(argv[i + 1], strlen(argv[i + 1]));
        i++;
      } else {
        _usage(EXIT_FAILURE);
      }
    }
  }

  // set restrictive umask, in case we create any files
  umask(027);

  if (daemon && (logfile == NULL)) {
    fprintf(stderr, "Must specify a logfile when running in daemon mode\n");
    _usage(EXIT_FAILURE);
  }

  if (daemon) {
    // inside this call, parent will EXIT_SUCCESS and child will continue
    _daemonize();
  }

  Logger *logger = NULL;
  if (logfile) {
    logger = _createLogfile(logfile);
    parcMemory_Deallocate((void **)&logfile);
  } else {
    PARCLogReporter *stdoutReporter = parcLogReporterTextStdout_Create();
    logger = logger_Create(stdoutReporter, parcClock_Wallclock());
    parcLogReporter_Release(&stdoutReporter);
  }

  for (int i = 0; i < LoggerFacility_END; i++) {
    if (logLevelArray[i] > -1) {
      logger_SetLogLevel(logger, i, logLevelArray[i]);
    }
  }

  // this will update the clock to the tick clock
  Forwarder *forwarder = forwarder_Create(logger);

  Configuration *configuration = forwarder_GetConfiguration(forwarder);

  if (capacity > -1) {
    configuration_SetObjectStoreSize(configuration, capacity);
  }

  if (configFileName) {
    forwarder_SetupAllListeners(forwarder, port, NULL);
    forwarder_SetupFromConfigFile(forwarder, configFileName);
  } else {
    // NULL to not setup AF_UNIX
    forwarder_SetupAllListeners(forwarder, port, NULL);
  }

  Dispatcher *dispatcher = forwarder_GetDispatcher(forwarder);

  logger_Log(logger, LoggerFacility_Core, PARCLogLevel_Alert, "daemon",
             "hicn-light running port %d configuration-port %d", port,
             configurationPort);

  dispatcher_Run(dispatcher);

  logger_Log(logger, LoggerFacility_Core, PARCLogLevel_Alert, "daemon",
             "hicn-light exiting port %d", port);

  forwarder_Destroy(&forwarder);

  sleep(2);

  logger_Release(&logger);
  return 0;
}