summaryrefslogtreecommitdiffstats
path: root/src/main.c
blob: 774a5f0e428efd1fc958c4ae3ad5dc3c19de599b (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
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
/*
 * Copyright (C) 2015, 2016, 2017 "IoT.bzh"
 * Author "Fulup Ar Foll"
 * Author José Bollo <jose.bollo@iot.bzh>
 *
 * 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.
 */

#define _GNU_SOURCE
#define NO_BINDING_VERBOSE_MACRO

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/wait.h>

#include <systemd/sd-event.h>

#include "afb-config.h"
#include "afb-hswitch.h"
#include "afb-apis.h"
#include "afb-api-so.h"
#include "afb-api-dbus.h"
#include "afb-api-ws.h"
#include "afb-hsrv.h"
#include "afb-context.h"
#include "afb-hreq.h"
#include "afb-sig-handler.h"
#include "afb-thread.h"
#include "afb-session.h"
#include "verbose.h"
#include "afb-common.h"
#include "afb-hook.h"

#include <afb/afb-binding.h>

/*
   if SELF_PGROUP == 0 the launched command is the group leader
   if SELF_PGROUP != 0 afb-daemon is the group leader
*/
#define SELF_PGROUP 1

static struct afb_config *config;
static pid_t childpid;

/*----------------------------------------------------------
 |   helpers for handling list of arguments
 +--------------------------------------------------------- */

/*
 * Calls the callback 'run' for each value of the 'list'
 * until the callback returns 0 or the end of the list is reached.
 * Returns either NULL if the end of the list is reached or a pointer
 * to the item whose value made 'run' return 0.
 * 'closure' is used for passing user data.
 */
static struct afb_config_list *run_for_list(struct afb_config_list *list,
					    int (*run) (void *closure, char *value),
					    void *closure)
{
	while (list && run(closure, list->value))
		list = list->next;
	return list;
}

static int run_start(void *closure, char *value)
{
	int (*starter) (const char *value) = closure;
	return starter(value) >= 0;
}

static void start_list(struct afb_config_list *list,
		       int (*starter) (const char *value), const char *message)
{
	list = run_for_list(list, run_start, starter);
	if (list) {
		ERROR("can't start %s %s", message, list->value);
		exit(1);
	}
}

/*----------------------------------------------------------
 | exit_handler
 |   Handles on exit specific actions
 +--------------------------------------------------------- */
static void exit_handler()
{
	/* TODO: check whether using SIGHUP isn't better */
	if (SELF_PGROUP)
		killpg(0, SIGKILL);
	else if (childpid > 0)
		killpg(childpid, SIGKILL);
}

/*----------------------------------------------------------
 | daemonize
 |   set the process in background
 +--------------------------------------------------------- */
static void daemonize()
{
	int consoleFD;
	int pid;

	// open /dev/console to redirect output messAFBes
	consoleFD = open(config->console, O_WRONLY | O_APPEND | O_CREAT, 0640);
	if (consoleFD < 0) {
		ERROR("AFB-daemon cannot open /dev/console (use --foreground)");
		exit(1);
	}
	// fork process when running background mode
	pid = fork();

	// if fail nothing much to do
	if (pid == -1) {
		ERROR("AFB-daemon Failed to fork son process");
		exit(1);
	}
	// if in father process, just leave
	if (pid != 0)
		_exit(0);

	// son process get all data in standalone mode
	NOTICE("background mode [pid:%d console:%s]", getpid(),
	       config->console);

	// redirect default I/O on console
	close(2);
	dup(consoleFD);		// redirect stderr
	close(1);
	dup(consoleFD);		// redirect stdout
	close(0);		// no need for stdin
	close(consoleFD);

#if 0
	setsid();		// allow father process to fully exit
	sleep(2);		// allow main to leave and release port
#endif
}

/*---------------------------------------------------------
 | http server
 |   Handles the HTTP server
 +--------------------------------------------------------- */
static int init_alias(void *closure, char *spec)
{
	struct afb_hsrv *hsrv = closure;
	char *path = strchr(spec, ':');

	if (path == NULL) {
		ERROR("Missing ':' in alias %s. Alias ignored", spec);
		return 1;
	}
	*path++ = 0;
	INFO("Alias for url=%s to path=%s", spec, path);
	return afb_hsrv_add_alias(hsrv, spec, afb_common_rootdir_get_fd(), path,
				  0, 0);
}

static int init_http_server(struct afb_hsrv *hsrv)
{
	if (!afb_hsrv_add_handler
	    (hsrv, config->rootapi, afb_hswitch_websocket_switch, NULL, 20))
		return 0;

	if (!afb_hsrv_add_handler
	    (hsrv, config->rootapi, afb_hswitch_apis, NULL, 10))
		return 0;

	if (run_for_list(config->aliases, init_alias, hsrv))
		return 0;

	if (config->roothttp != NULL) {
		if (!afb_hsrv_add_alias
		    (hsrv, "", afb_common_rootdir_get_fd(), config->roothttp,
		     -10, 1))
			return 0;
	}

	if (!afb_hsrv_add_handler
	    (hsrv, config->rootbase, afb_hswitch_one_page_api_redirect, NULL,
	     -20))
		return 0;

	return 1;
}

static struct afb_hsrv *start_http_server()
{
	int rc;
	struct afb_hsrv *hsrv;

	if (afb_hreq_init_download_path(config->uploaddir)) {
		ERROR("unable to set the upload directory %s", config->uploaddir);
		return NULL;
	}

	hsrv = afb_hsrv_create();
	if (hsrv == NULL) {
		ERROR("memory allocation failure");
		return NULL;
	}

	if (!afb_hsrv_set_cache_timeout(hsrv, config->cacheTimeout)
	    || !init_http_server(hsrv)) {
		ERROR("initialisation of httpd failed");
		afb_hsrv_put(hsrv);
		return NULL;
	}

	NOTICE("Waiting port=%d rootdir=%s", config->httpdPort, config->rootdir);
	NOTICE("Browser URL= http:/*localhost:%d", config->httpdPort);

	rc = afb_hsrv_start(hsrv, (uint16_t) config->httpdPort, 15);
	if (!rc) {
		ERROR("starting of httpd failed");
		afb_hsrv_put(hsrv);
		return NULL;
	}

	return hsrv;
}

/*---------------------------------------------------------
 | execute_command
 |   
 +--------------------------------------------------------- */

static void on_sigchld(int signum, siginfo_t *info, void *uctx)
{
	if (info->si_pid == childpid) {
		switch (info->si_code) {
		case CLD_EXITED:
		case CLD_KILLED:
		case CLD_DUMPED:
			childpid = 0;
			if (!SELF_PGROUP)
				killpg(info->si_pid, SIGKILL);
			waitpid(info->si_pid, NULL, 0);
			exit(0);
		}
	}
}

/*
# @@ @
# @p port
# @t token
*/

#define SUBST_CHAR  '@'
#define SUBST_STR   "@"

static int instanciate_command_args()
{
	char *orig, *repl, *sub, *val, port[20];
	int i, rc, r;
	size_t s, l;

	rc = snprintf(port, sizeof port, "%d", config->httpdPort);
	if (rc < 0 || rc >= (int)(sizeof port))
		return -1;

	for (i = 0 ; (orig = config->exec[i]) ; i++) {
		repl = 0;
		s = 0;
		for(;;) {
			sub = strchrnul(orig, SUBST_CHAR);
			l = sub - orig;
			if (repl)
				repl = mempcpy(repl, orig, l);
			else
				s += l;
			if (!*sub) {
				/* at end */
				if (repl || orig == config->exec[i])
					break;
				repl = malloc(1 + s);
				if (!repl)
					return -1;
				orig = config->exec[i];
				config->exec[i] = repl;
				repl[s] = 0;
			} else {
				r = 2;
				switch(sub[1]) {
				case 'p': val = port;  break;
				case 't': val = config->token ? : ""; break;
				default: r = 1;
				case SUBST_CHAR: val = SUBST_STR; break;
				}
				orig = &sub[r];
				l = strlen(val);
				if (repl)
					repl = mempcpy(repl, val, l);
				else
					s += l;
			}
		}
	}
	return 0;
}

static int execute_command()
{
	struct sigaction siga;

	/* check whether a command is to execute or not */
	if (!config->exec || !config->exec[0])
		return 0;

	if (SELF_PGROUP)
		setpgid(0, 0);

	/* install signal handler */
	memset(&siga, 0, sizeof siga);
	siga.sa_sigaction = on_sigchld;
	siga.sa_flags = SA_SIGINFO;
	sigaction(SIGCHLD, &siga, NULL);

	/* fork now */
	childpid = fork();
	if (childpid)
		return 0;

	/* makes arguments */
	if (instanciate_command_args() >= 0) {
		if (!SELF_PGROUP)
			setpgid(0, 0);
		execv(config->exec[0], config->exec);
		ERROR("can't launch %s: %m", config->exec[0]);
	}
	exit(1);
	return -1;
}

/*---------------------------------------------------------
 | main
 |   Parse option and launch action
 +--------------------------------------------------------- */

int main(int argc, char *argv[])
{
	struct afb_hsrv *hsrv;
	struct sd_event *eventloop;

	LOGAUTH("afb-daemon");

	// ------------- Build session handler & init config -------
	config = afb_config_parse_arguments(argc, argv);
	atexit(exit_handler);

	// ------------------ sanity check ----------------------------------------
	if (config->httpdPort <= 0) {
		ERROR("no port is defined");
		exit(1);
	}

	mkdir(config->workdir, S_IRWXU | S_IRGRP | S_IXGRP);
	if (chdir(config->workdir) < 0) {
		ERROR("Can't enter working dir %s", config->workdir);
		exit(1);
	}

	afb_session_init(config->nbSessionMax, config->cntxTimeout, config->token, afb_apis_count());

	afb_api_so_set_timeout(config->apiTimeout);
	start_list(config->dbus_clients, afb_api_dbus_add_client, "the afb-dbus client");
	start_list(config->ws_clients, afb_api_ws_add_client, "the afb-websocket client");
	start_list(config->ldpaths, afb_api_so_add_pathset, "the binding path set");
	start_list(config->so_bindings, afb_api_so_add_binding, "the binding");
	start_list(config->dbus_servers, afb_api_dbus_add_server, "the afb-dbus service");
	start_list(config->ws_servers, afb_api_ws_add_server, "the afb-websocket service");

	if (!afb_hreq_init_cookie(config->httpdPort, config->rootapi, config->cntxTimeout)) {
		ERROR("initialisation of cookies failed");
		exit(1);
	}

	if (afb_sig_handler_init() < 0) {
		ERROR("failed to initialise signal handlers");
		return 1;
	}

	// set the root dir
	if (afb_common_rootdir_set(config->rootdir) < 0) {
		ERROR("failed to set common root directory");
		return 1;
	}

	if (afb_thread_init(3, 1, 20) < 0) {
		ERROR("failed to initialise threading");
		return 1;
	}
	// let's run this program with a low priority
	nice(20);

	// ------------------ Finaly Process Commands -----------------------------
	// let's not take the risk to run as ROOT
	//if (getuid() == 0)  goto errorNoRoot;

	DEBUG("Init config done");

	// --------- run -----------
	if (config->background) {
		// --------- in background mode -----------
		INFO("entering background mode");
		daemonize();
	} else {
		// ---- in foreground mode --------------------
		INFO("entering foreground mode");
	}

	/* ignore any SIGPIPE */
	signal(SIGPIPE, SIG_IGN);

	/* install trace of requests */
	if (config->tracereq)
		afb_hook_req_create(NULL, NULL, NULL, config->tracereq, NULL, NULL);

	/* start the services */
	if (afb_apis_start_all_services(1) < 0)
		exit(1);

	/* start the HTTP server */
	if (!config->noHttpd) {
		hsrv = start_http_server();
		if (hsrv == NULL)
			exit(1);
	}

	/* run the command */
	if (execute_command() < 0)
		exit(1);

	/* signal that ready */
	if (config->readyfd != 0) {
		static const char readystr[] = "READY=1";
		write(config->readyfd, readystr, sizeof(readystr) - 1);
		close(config->readyfd);
	}

	// infinite loop
	eventloop = afb_common_get_event_loop();
	for (;;)
		sd_event_run(eventloop, 30000000);

	WARNING("hoops returned from infinite loop [report bug]");

	return 0;
}