aboutsummaryrefslogtreecommitdiff
path: root/src/ping903.c
blob: efc6246cd3fe7dea6478f1532f5ffe995f7299e2 (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
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
/* This file is part of Ping903
   Copyright (C) 2020 Sergey Poznyakoff
  
   Ping903 is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.
  
   Ping903 is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
  
   You should have received a copy of the GNU General Public License
   along with Ping903.  If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <syslog.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <microhttpd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include "ping903.h"
#include "json.h"
#include "defs.h"

char *httpd_addr;
int httpd_access_log = 0;
int httpd_log_verbose = 0;

static int
open_node(char const *node, char const *serv, struct sockaddr **saddr)
{
	struct addrinfo hints;
	struct addrinfo *res;
	int reuse;
	int fd;
	int rc;

	memset(&hints, 0, sizeof(hints));
	hints.ai_family = AF_INET;
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_protocol = IPPROTO_TCP;
	rc = getaddrinfo(node, serv, &hints, &res);
	if (rc) {
		error("%s: %s", node, gai_strerror(rc));
		exit(1);
	}

	fd = socket(res->ai_family, res->ai_socktype, 0);
	if (fd == -1) {
		error("socket: %s", strerror(errno));
		exit(1);
	}
	reuse = 1;
	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
		   &reuse, sizeof(reuse));
	if (bind(fd, res->ai_addr, res->ai_addrlen) == -1) {
		error("bind: %s", strerror(errno));
		exit(1);
	}

	if (listen(fd, 8) == -1) {
		error("listen: %s", strerror(errno));
		exit(1);
	}

	if (saddr) {
		*saddr = emalloc(res->ai_addrlen);
		memcpy(*saddr, res->ai_addr, res->ai_addrlen);
	}
	freeaddrinfo(res);

	return fd;
}

static int
open_listener(char const *addr, struct sockaddr **saddr)
{
	size_t len;
	int fd;

	if (!addr)
		return open_node(DEFAULT_ADDRESS, DEFAULT_SERVICE, saddr);
	
	len = strcspn(addr, ":");
	if (len == 0)
		fd = open_node(DEFAULT_ADDRESS, addr + 1, saddr);
	else if (addr[len] == 0)
		fd = open_node(addr, DEFAULT_SERVICE, saddr);
	else {
		char *node;
		node = emalloc(len + 1);
		memcpy(node, addr, len);
		node[len] = 0;
		fd = open_node(node, addr + len + 1, saddr);
		free(node);
	}
	return fd;
}

static void
p903_httpd_logger(void *arg, const char *fmt, va_list ap)
{
	vlogger(LOG_ERR, fmt, ap);
}

static void
p903_httpd_panic(void *cls, const char *file, unsigned int line,
		 const char *reason)
{
	if (reason)
		fatal("%s:%d: MHD PANIC: %s", file, line, reason);
	else
		fatal("%s:%d: MHD PANIC", file, line);
	abort();
}

#if HAVE_LIBWRAP
extern int p903_httpd_acl(void *cls, const struct sockaddr *addr,
			  socklen_t addrlen);
#else
# define p903_httpd_acl NULL
#endif

static void
http_log(struct MHD_Connection *connection,
	 char const *method, char const *url,
	 int status, char const *str)
{
	char *ipstr;
	char const *host, *referer, *user_agent;
	time_t t;
	struct tm *tm;
	char tbuf[30];

	if (!httpd_access_log)
		return;
	if (!httpd_log_verbose)
		str = NULL;
	ipstr = get_remote_ip(connection);

	host = MHD_lookup_connection_value(connection,
					   MHD_HEADER_KIND,
					   MHD_HTTP_HEADER_HOST);
	referer = MHD_lookup_connection_value(connection,
					      MHD_HEADER_KIND,
					      MHD_HTTP_HEADER_REFERER);
	user_agent = MHD_lookup_connection_value(connection,
						 MHD_HEADER_KIND,
						 MHD_HTTP_HEADER_USER_AGENT);
	t = time(NULL);
	tm = localtime(&t);
	strftime(tbuf, sizeof(tbuf), "[%d/%b/%Y:%H:%M:%S %z]", tm);

	info("%s %s - - %s \"%s %s\" \"%.1024s\" %3d \"%s\" \"%s\"",
	     host, ipstr, tbuf, method, url, str ? str : "", status,
	     referer ? referer : "",
	     user_agent ? user_agent : "");
	free(ipstr);
}
	

static int
http_error(struct MHD_Connection *conn,
	   char const *method, char const *url, int status)
{
	int ret;
	struct MHD_Response *resp =
		MHD_create_response_from_buffer(0,
						NULL,
						MHD_RESPMEM_PERSISTENT);
	http_log(conn, method, url, status, NULL);
	ret = MHD_queue_response(conn, status, resp);
	MHD_destroy_response(resp);
	return ret;
}

struct strbuf {
	char *base;
	size_t off;
	size_t size;
	int err;
};

static void
strbuf_writer(void *closure, char const *text, size_t len)
{
	struct strbuf *sb = closure;
	if (sb->err)
		return;
	while (sb->off + len >= sb->size) {
		char *p = json_2nrealloc(sb->base, &sb->size, 1);
		if (!p) {
			error("not enough memory trying to format reply");
			sb->err = 1;
			return;
		}
		sb->base = p;
	}
	memcpy(sb->base + sb->off, text, len);
	sb->off += len;
}
	
static char *
json_to_str(struct json_value *obj)
{
	struct strbuf sb;
	struct json_format fmt = {
		.indent = 0,
		.precision = 5,
		.write = strbuf_writer,
		.data = &sb
	};

	memset(&sb, 0, sizeof(sb));
	json_value_format(obj, &fmt, 0);
	strbuf_writer(&sb, "", 1);

	if (sb.err) {
		free(sb.base);
		return NULL;
	}
	return sb.base;
}

static int
httpd_json_response(struct MHD_Connection *conn,
		    char const *url, char const *method,
		    struct json_value *val)
{
	char *reply;
	struct MHD_Response *resp;
	int ret;
	
	reply = json_to_str(val);
	json_value_free(val);
	if (!reply)
		return http_error(conn, method, url,
				  MHD_HTTP_INTERNAL_SERVER_ERROR);
	
	resp = MHD_create_response_from_buffer(strlen(reply),
					       reply, MHD_RESPMEM_MUST_COPY);
	http_log(conn, method, url, MHD_HTTP_OK, reply);
	free(reply);
	MHD_add_response_header(resp,
				MHD_HTTP_HEADER_CONTENT_TYPE,
				"application/json");
	ret = MHD_queue_response(conn, MHD_HTTP_OK, resp);
	MHD_destroy_response(resp);
	return ret;
}

static int
ept_config(struct MHD_Connection *conn,
	   const char *url, const char *method, const char *suffix)
{
	struct json_value *val;
	
	while (*suffix == '/')
		suffix++;

	val = config_to_json();
	if (!val)
		return http_error(conn, method, url,
				  MHD_HTTP_INTERNAL_SERVER_ERROR);
	
	if (*suffix) {
		struct json_value *jv, *cp;
		int ret;
		
		if (json_object_get(val, suffix, &jv)) {
			ret = http_error(conn, method, url,
					 (errno == ENOENT)
					   ? MHD_HTTP_NOT_FOUND
					   : MHD_HTTP_INTERNAL_SERVER_ERROR);
			json_value_free(val);
			return ret;
		}

		if (json_value_copy(jv, &cp)) {
			ret = http_error(conn, method, url,
					 MHD_HTTP_INTERNAL_SERVER_ERROR);
			json_value_free(val);
			return ret;
		}
		json_value_free(val);
		val = cp;
	}
		
	return httpd_json_response(conn, url, method, val);
}

static int
ept_ip_delete(struct MHD_Connection *conn,
	      const char *url, const char *method, const char *suffix)
{
	int ret;
	struct MHD_Response *resp;
	
	while (*suffix == '/')
		suffix++;
	if (!*suffix)
		return http_error(conn, method, url, MHD_HTTP_FORBIDDEN);
	if (hostping_delete_by_name(suffix))
		return http_error(conn, method, url, MHD_HTTP_NOT_FOUND);
		
	resp = MHD_create_response_from_buffer(0,
					       NULL,
					       MHD_RESPMEM_PERSISTENT);
	http_log(conn, method, url, MHD_HTTP_OK, NULL);
	ret = MHD_queue_response(conn, MHD_HTTP_OK, resp);
	MHD_destroy_response(resp);
	return ret;
}

static int
ept_ip_put(struct MHD_Connection *conn,
	   const char *url, const char *method, const char *suffix)
{
	int ret;
	struct MHD_Response *resp;
	
	while (*suffix == '/')
		suffix++;
	if (!*suffix)
		return http_error(conn, method, url, MHD_HTTP_FORBIDDEN);
	if (hostping_add_name(suffix))
		//FIXME
		return http_error(conn, method, url, MHD_HTTP_FORBIDDEN);
	resp = MHD_create_response_from_buffer(0,
					       NULL,
					       MHD_RESPMEM_PERSISTENT);
	http_log(conn, method, url, MHD_HTTP_CREATED, NULL);
	ret = MHD_queue_response(conn, MHD_HTTP_CREATED, resp);
	MHD_destroy_response(resp);
	return ret;
}

static int
ept_host_stat(struct MHD_Connection *conn,
	      const char *url, const char *method, const char *suffix)
{
	struct json_value *val;
	int rc;

	while (*suffix == '/')
		suffix++;
	
	if (suffix[0] == 0) {
		rc = get_all_host_stat(&val);
	} else {
		rc = get_hostname_stat(suffix, &val);
	}
	if (rc)
		return http_error(conn, method, url,
				  MHD_HTTP_INTERNAL_SERVER_ERROR);
		
	return httpd_json_response(conn, url, method, val);	
}

static int
ept_ip_stat(struct MHD_Connection *conn,
	    const char *url, const char *method, const char *suffix)
{
	struct json_value *val;
	int rc;

	while (*suffix == '/')
		suffix++;
	
	if (suffix[0] == 0) {
		return http_error(conn, method, url, MHD_HTTP_FORBIDDEN);
	} else {
		int ret;
		struct addrinfo hints, *res;
		memset(&hints, 0, sizeof(hints));
		hints.ai_family = AF_INET;
		hints.ai_protocol = IPPROTO_TCP;
		rc = getaddrinfo(suffix, NULL, &hints, &res);
		if (rc)
			return http_error(conn, method, url,
					  MHD_HTTP_NOT_FOUND);
		rc = get_ipaddr_stat(res->ai_addr, res->ai_addrlen, &val);
		if (rc)
			ret = http_error(conn, method, url,
					 MHD_HTTP_INTERNAL_SERVER_ERROR);
		else if (val)
			ret = httpd_json_response(conn, url, method, val);
		else
			ret = http_error(conn, method, url, MHD_HTTP_FORBIDDEN);
		freeaddrinfo(res);
		return ret;
	}
}

static int
ept_ip_match(struct MHD_Connection *conn,
	    const char *url, const char *method, const char *suffix)
{
	struct json_value *val;
	int rc;
	int ret;
	struct addrinfo hints, *res;

	while (*suffix == '/')
		suffix++;
	
	if (suffix[0] == 0)
		return http_error(conn, method, url, MHD_HTTP_FORBIDDEN);

	memset(&hints, 0, sizeof(hints));
	hints.ai_family = AF_INET;
	hints.ai_protocol = IPPROTO_TCP;
	rc = getaddrinfo(suffix, NULL, &hints, &res);
	if (rc)
		return http_error(conn, method, url, MHD_HTTP_NOT_FOUND);
	rc = get_host_matches(&res, &val);
	if (rc)
		ret = http_error(conn, method, url,
				 MHD_HTTP_INTERNAL_SERVER_ERROR);
	else
		ret = httpd_json_response(conn, url, method, val);
	freeaddrinfo(res);
	return ret;
}


typedef int (*ENDPOINT_HANDLER)(struct MHD_Connection *,
				const char *, const char *, const char *);

enum {
	EPT_EXACT  = 0x01,
	EPT_PREFIX = 0x02
};

struct endpoint {
	char *url;
	int flags;
	char *method;
	ENDPOINT_HANDLER handler;
};

static struct endpoint endpoint[] = {
	{ "/config/ip-list", EPT_PREFIX, MHD_HTTP_METHOD_PUT, ept_ip_put },
	{ "/config/ip-list", EPT_PREFIX, MHD_HTTP_METHOD_DELETE, ept_ip_delete },
	{ "/config", EPT_PREFIX, MHD_HTTP_METHOD_GET, ept_config },
	{ "/host",   EPT_PREFIX, MHD_HTTP_METHOD_GET, ept_host_stat },
	{ "/ip",     EPT_PREFIX, MHD_HTTP_METHOD_GET, ept_ip_stat },
	{ "/match",  EPT_PREFIX, MHD_HTTP_METHOD_GET, ept_ip_match },
	{ NULL }
};

static ENDPOINT_HANDLER
find_endpoint_handler(char const *url, char const *method, char const **suffix)
{
	struct endpoint *ept;
	for (ept = endpoint; ept->url; ept++) {
		if (strcmp(ept->method, method))
			continue;
		if (ept->flags & EPT_EXACT) {
			if (strcmp(ept->url, url) == 0) {
				*suffix = url + strlen(url);
				return ept->handler;
			}
		} else {
			size_t len = strlen(ept->url);
			if (strncmp(url, ept->url, len) == 0
			    && (url[len] == '/' || url[len] == 0)) {
				*suffix = url + len;
				return ept->handler;
			}
		}
	}
	return NULL;
}

static int
p903_httpd_handler(void *cls,
		   struct MHD_Connection *conn,
		   const char *url, const char *method,
		   const char *version,
		   const char *upload_data, size_t *upload_data_size,
		   void **con_cls)
{
	ENDPOINT_HANDLER handler;
	char const *suffix;
	
	handler = find_endpoint_handler(url, method, &suffix);
	if (handler)
		return handler(conn, url, method, suffix);
			       
        if (strcmp(method, MHD_HTTP_METHOD_GET))
		return http_error(conn, method, url,
				  MHD_HTTP_METHOD_NOT_ALLOWED);
	return http_error(conn, method, url, MHD_HTTP_FORBIDDEN);
}

void
ping903(void)
{
	struct MHD_Daemon *mhd;
	sigset_t sigs;
	int i;
	pthread_t tid;
        int fd = -1;
	struct sockaddr *server_addr;

	p903_init();
	
	fd = open_listener(httpd_addr, &server_addr);
	
	/* Block the 'fatal signals' and SIGPIPE in the handling thread */
	sigemptyset(&sigs);
	for (i = 0; fatal_signals[i]; i++)
		sigaddset(&sigs, fatal_signals[i]);
	sigaddset(&sigs, SIGPIPE);

	pthread_sigmask(SIG_BLOCK, &sigs, NULL);
	MHD_set_panic_func(p903_httpd_panic, NULL);
	mhd = MHD_start_daemon(MHD_USE_INTERNAL_POLLING_THREAD
			       | MHD_USE_ERROR_LOG, 0,
			       p903_httpd_acl, server_addr,
			       p903_httpd_handler, NULL,
			       MHD_OPTION_LISTEN_SOCKET, fd,
			       MHD_OPTION_EXTERNAL_LOGGER, p903_httpd_logger, NULL,
			       MHD_OPTION_END);
	
	/* Unblock only the fatal signals */
	sigdelset(&sigs, SIGPIPE);
	pthread_sigmask(SIG_UNBLOCK, &sigs, NULL);

	/* Start the Receiver thread */
	pthread_create(&tid, NULL, p903_receiver, NULL);
	/* Start the Sender thread */
	pthread_create(&tid, NULL, p903_sender, NULL);
	/* Start the Scheduler thread */
	pthread_create(&tid, NULL, p903_scheduler, NULL);

	/* Wait for signal to arrive */
	sigwait(&sigs, &i);
	MHD_stop_daemon(mhd);
}

Return to:

Send suggestions and report system problems to the System administrator.