summaryrefslogtreecommitdiffstats
path: root/nanohttp/nanohttp-client.c
blob: 22571c6ea41b11326c722f9e8fe8bfba15a259f7 (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
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
/******************************************************************
*  $Id: nanohttp-client.c,v 1.16 2004/08/30 15:26:53 snowdrop Exp $
*
* CSOAP Project:  A http client/server library in C
* Copyright (C) 2003  Ferhat Ayaz
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA  02111-1307, USA.
* 
* Email: ayaz@jprogrammer.net
******************************************************************/
#include <nanohttp/nanohttp-client.h>

#ifdef WIN32
#include "wsockcompat.h"
#include <winsock2.h>
#define close(s) closesocket(s)
#endif

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <time.h>
#include <stdio.h>
#include <stdlib.h>


#ifdef WIN32

#include <string.h>

static struct tm *localtime_r(const time_t *const timep, struct tm *p_tm)
{
	static struct tm* tmp;
	tmp = localtime(timep);
	if (tmp) {
		memcpy(p_tm, tmp, sizeof(struct tm));
		tmp = p_tm;
	}    
	return tmp;
}

#endif

/*--------------------------------------------------
FUNCTION: httpc_init
DESC: Initialize http client connection 
NOTE: This will be called from soap_client_init_args()
----------------------------------------------------*/
int httpc_init(int argc, char *argv[])
{
	hsocket_module_init();
	return 0;
}

/*--------------------------------------------------
FUNCTION: httpc_new
DESC: Creates a new http client connection object
You need to create at least 1 http client connection
to communicate via http.
----------------------------------------------------*/
httpc_conn_t* httpc_new()
{
	httpc_conn_t* res = (httpc_conn_t*)malloc(sizeof(httpc_conn_t));

	hsocket_init(&res->sock);
	res->header = NULL;
	res->url = NULL;

	return res;
}


/*--------------------------------------------------
FUNCTION: httpc_free
DESC: Free the given http client object.
----------------------------------------------------*/
void httpc_free(httpc_conn_t* conn)
{
	hpair_t *tmp;

	if (conn != NULL) {
		hsocket_free(conn->sock);

		while (conn->header != NULL) {    
			tmp = conn->header;
			conn->header = conn->header->next;
			hpairnode_free(tmp);
		}

		free(conn);
	}
}


/*--------------------------------------------------
FUNCTION: httpc_set_header
DESC: Adds a new (key, value) pair to the header
or modifies the old pair if this function will 
finds another pair with the same 'key' value.
----------------------------------------------------*/
int httpc_set_header(httpc_conn_t *conn, const char* key, const char* value)
{
	hpair_t *p;

	if (conn == NULL) {
		log_warn1("Connection object is NULL");
		return 0;
	}

	p = conn->header;
	while (p != NULL) {
		if (p->key != NULL) {
			if (!strcmp(p->key, key)) {
				free(p->value);
				p->value = (char*)malloc(strlen(value)+1);
				strcpy(p->value, value);
				return 1;
			}
		}
		p = p->next;
	}

	conn->header = hpairnode_new(key, value, conn->header);
	return 0;
}


/*--------------------------------------------------
FUNCTION: httpc_header_add_date
DESC: Adds the current date to the header. 
----------------------------------------------------*/
static 
void httpc_header_add_date(httpc_conn_t *conn)
{
	char buffer[255];
	time_t nw;
	struct tm stm;

	/* Set date */
	nw = time(NULL);
	localtime_r(&nw, &stm);
	strftime(buffer, 255, "%a, %d %b %y %T GMT", &stm);
	httpc_set_header(conn, HEADER_DATE, buffer); 

}


/*--------------------------------------------------
FUNCTION: httpc_send_header
DESC: Sends the current header information stored
in conn through conn->sock.
----------------------------------------------------*/
int httpc_send_header(httpc_conn_t *conn)
{
	hpair_t *p;
	int status;
	char buffer[1024];

	p = conn->header;
	while (p != NULL) {
		if (p->key && p->value) {
			sprintf(buffer, "%s: %s\r\n", p->key, p->value);
			status = hsocket_send(conn->sock, buffer);
			if (status != HSOCKET_OK)
				return status;
		}
		p = p->next;
	}

	status = hsocket_send(conn->sock, "\r\n");
	return status;
}

static
hresponse_t *httpc_receive_header(hsocket_t sock)
{
	hresponse_t *res;
	int done;
	int i;
	int status;
	char buffer[HSOCKET_MAX_BUFSIZE];
	char *response;
	char *rest;
	int rsize;
	int restsize;

	/* Receive Response incl. header */
	rsize = restsize = 0;
	response = rest = NULL;
	done = 0;

	while (!done) {

		status = hsocket_read(sock, buffer, HSOCKET_MAX_BUFSIZE, 0);

		if (status <= 0) {
			log_error2("Can not receive response (status:%d)", status); 
			return NULL;
		} 


		for (i=0;i<status-2;i++) {

			/*  log_debug5("%d -> '%c' (%d, %d)", buffer[i], buffer[i], 
			buffer[i+1], buffer[i+2]);
			*/
			if (buffer[i] == '\n') {
				if (buffer[i+1] == '\n') {

					response = (char*)realloc(response, rsize+i+1);
					strncpy(&response[rsize], buffer, i);
					response[rsize+i] = '\0';
					rsize += i;

					restsize = status - i - 2;
					rest = (char*)malloc(restsize+1);
					strncpy(rest, &buffer[i+2], restsize);
					rest[restsize] = '\0';
					done = 1;
					break;

				} else if (buffer[i+1] == '\r' &&  buffer[i+2] == '\n') {

					response = (char*)realloc(response, rsize+i+1);
					strncpy(&response[rsize], buffer, i);
					response[rsize+i] = '\0';
					rsize += i;

					restsize = status - i - 3;
					rest = (char*)malloc(restsize+1);
					strncpy(rest, &buffer[i+3], restsize);
					rest[restsize] = '\0';
					done = 1;
					break;
				}
			}
		}

		if (!done)
			rsize += status;
	}


	if (response == NULL) {
		log_error1("Header too long!");
		return NULL;
	}

	res = hresponse_new_from_buffer(response);
	if (res == NULL) {
		log_error1("Can't create response");
		return NULL;
	}

	res->bodysize = restsize;
	res->body = rest;

	if (res->errcode == 100) { /* continue */
		hresponse_free(res);
		res = httpc_receive_header(sock);
	}
	return res;
}


static
int httpc_receive_with_connection_closed(httpc_conn_t *conn,
										 hresponse_t *res,
										 httpc_response_callback cb, 
										 void *userdata)
{
	/* connection closed */
	char *connection_status;
	int status;
	char buffer[HSOCKET_MAX_BUFSIZE];
	int counter;

	counter = 0;

	/* ================================================= */
	/*   Retreive with only "Connection: close"          */ 
	/* ================================================= */
	connection_status = 
		hpairnode_get(res->header, HEADER_CONNECTION);

	if (connection_status != NULL && 
		!strcmp(connection_status, "close")) { 

			log_debug1("Server communicates with 'Connection: close' !");

			/* Invoke callback for rest */
			if (res->bodysize > 0)
				cb(0, conn, userdata, res->bodysize, res->body);


			while (1) {

				status = hsocket_read(conn->sock, buffer, HSOCKET_MAX_BUFSIZE, 0);

				if (status == 0) { /* close connection */
					close(conn->sock);
					return 0; 
				}

				if (status < 0) { /* error */
					log_error2("Can nor read from socket (status: %d)", status);
					return 11;
				}

				/* Invoke callback */ 
				cb(counter++, conn, userdata, status, buffer);
			}

			return 0;
		}

		return -1;
}

static
int httpc_receive_with_chunked_encoding(httpc_conn_t *conn,
										hresponse_t *res,
										httpc_response_callback cb, 
										void *userdata)
{
	/* chunked encoding */
	char *transfer_encoding;
	char *chunk_buffer;
	int chunk_size;
	hbufsocket_t bufsock;
	char chunk_size_str[25];
	int chunk_size_cur;
	int counter;
	char buffer[2];

	counter = 0;
	/* ================================================= */
	/*   Retreive with chunked encoding                  */ 
	/* ================================================= */

	/* Check if server communicates with chunked encoding */
	transfer_encoding = 
		hpairnode_get(res->header, HEADER_TRANSFER_ENCODING);

	if (transfer_encoding != NULL && 
		!strcmp(transfer_encoding, "chunked")) { 

			log_debug1("Server communicates with chunked encoding !");

			/* initialize buffered socket */
			bufsock.sock = conn->sock;
			bufsock.cur = 0;
			bufsock.buffer = (char *)res->body;
			bufsock.bufsize = res->bodysize;

			chunk_size = 1;
			while (chunk_size > 0) {

				/* read chunk size */
				chunk_size_cur = 0;
				while (1) {


					if (hbufsocket_read(&bufsock, &chunk_size_str[chunk_size_cur], 1)) {
						log_error1("Can not read from socket");
						return 9;
					}

					log_debug2("chunk_size_str[chunk_size_cur] = '%c'", 
						chunk_size_str[chunk_size_cur]);

					if (chunk_size_str[chunk_size_cur] == '\n') {
						chunk_size_str[chunk_size_cur] = '\0';
						break;
					}

					if (chunk_size_str[chunk_size_cur] != '\r'
						&& chunk_size_str[chunk_size_cur] != ';') {
							chunk_size_cur++;
						}

				} /* while (1) */

				chunk_size = strtol(chunk_size_str,(char**)NULL, 16); /* hex to dec */
				log_debug3("chunk_size: '%s' as dec: '%d'", 
					chunk_size_str, chunk_size);

				if (chunk_size <= 0) break;

				chunk_buffer = (char*)malloc(chunk_size+1);
				if (hbufsocket_read(&bufsock, chunk_buffer, chunk_size)) {
					log_error1("Can not read from socket");
					return 9;
				}
				cb(counter++, conn, userdata, chunk_size, chunk_buffer);
				free(chunk_buffer);

				/* skip new line */
				buffer[0] = 0; /* reset buffer[0] */
				while (buffer[0] != '\n') {
					hbufsocket_read(&bufsock, &buffer[0], 1);
				}

			} /* while (chunk_size > 0) */

			/* rest and response are no longer required */

			return 0;

		} /* if transfer_encodig */

		return -1;
}

/*
returns -1 if server does not communicate with 
content-length;
*/
static 
int httpc_receive_with_content_length(httpc_conn_t *conn,
									  hresponse_t *res,
									  httpc_response_callback cb, 
									  void *userdata)
{
	int counter;
	int content_length;
	int remain_length;
	int recvSize;
	char *content_length_str;
	char buffer[HSOCKET_MAX_BUFSIZE];

	/* ================================================= */
	/*   Retreive with content-length                    */ 
	/* ================================================= */

	/* Check if server communicates with content-length */
	content_length_str = 
		hpairnode_get_ignore_case(res->header, HEADER_CONTENT_LENGTH);

	if (content_length_str != NULL) {

		log_debug1("Server communicates with content-length!");

		/* Invoke callback for rest */
		if (res->bodysize > 0)
			cb(0, conn, userdata, res->bodysize, (char *)res->body);

		/* content length */
		content_length = atol(content_length_str);

		counter = 1;
		remain_length = content_length - res->bodysize;
		while (remain_length > 0) {
			if (remain_length >= HSOCKET_MAX_BUFSIZE) {
				recvSize = HSOCKET_MAX_BUFSIZE;
			} else {
				recvSize = remain_length;
			}

			if (hsocket_read(conn->sock, buffer, recvSize,1)) {
				log_error1("Can not read from socket!");
				return 9;
			} else {
				cb(counter++, conn, userdata, recvSize, buffer);
			}

			remain_length -= HSOCKET_MAX_BUFSIZE;

		} /* while */

		/* rest and response are no longer required */

		return 0;

	} /* if content length */

	return -1;
}

static
int httpc_receive_response(httpc_conn_t *conn, 
						   httpc_response_start_callback start_cb,
						   httpc_response_callback cb, void *userdata)
{
	hresponse_t *res;
	int status;

	/* receive header */
	log_verbose1("receiving header");
	res = httpc_receive_header(conn->sock);
	if (res == NULL) return 1;
	log_verbose1("header ok");

	/* Invoke callback */
	start_cb(conn, userdata, res->header, res->spec, 
		res->errcode, res->desc);

	/* try to receive with content length */
	status = httpc_receive_with_content_length(conn, res, 
		cb, userdata);
	if (status != -1) {
		hresponse_free(res);
		return status;
	}

	status = httpc_receive_with_chunked_encoding(conn, res,
		cb, userdata);

	if (status != -1) {
		hresponse_free(res);
		return status;
	}

	status = httpc_receive_with_connection_closed(conn, res,
		cb, userdata);
	if (status != -1) {
		hresponse_free(res);
		return status;
	}

	log_error1("Unknown server response retreive type!");
	return -1;
}

/*--------------------------------------------------
FUNCTION: httpc_talk_to_server
DESC: This function is the heart of the httpc 
module. It will send the request and process the
response. 

Here the parameters:

method:
the request method. This can be HTTP_REQUEST_POST and 
HTTP_REQUEST_GET.

conn: 
the connection object (created with httpc_new())

urlstr:
the complete url in string format.
http://<host>:<port>/<context>
where <port> is not mendatory.

start_cb:
a callback function, which will be called when
the response header is completely arrives.

cb:
a callback function, which will be called everytime
when data arrives.

content_size:
size of content to send. 
(only if method is HTTP_REQUEST_POST)

content:
the content data to send. 
(only if method is HTTP_REQUEST_POST)

userdata:
a user define data, which will be passed to the
start_cb and cb callbacks as a parameter. This
can also be NULL.


If success, this function will return 0. 
>0 otherwise.
----------------------------------------------------*/
static
int httpc_talk_to_server(hreq_method method, httpc_conn_t *conn, 
						 const char *urlstr)
{
	hurl_t *url;
	char buffer[4096];
	int status;

#ifdef WIN32
	unsigned long iMode = HSOCKET_NONBLOCKMODE;
#endif


	if (conn == NULL) {
		log_error1("Connection object is NULL");
		return 1;
	}

	/* Build request header */
	httpc_header_add_date(conn);

	/* Create url */
	url = hurl_new(urlstr);
	if (url == NULL) {
		log_error2("Can not parse URL '%s'", SAVE_STR(urlstr));
		return 2;
	}

	/* Set hostname  */
	httpc_set_header(conn, HEADER_HOST, url->host);

	/* Open connection */
	status = hsocket_open(&conn->sock, url->host, url->port);
	if (status != HSOCKET_OK) {
		log_error3("Can not open connection to '%s' (status:%d)", 
			SAVE_STR(url->host), status);
		return 3;
	}

#ifndef WIN32
	/* Try always non block mode
	#if HSOCKET_BLOCKMODE!=0*/
		fcntl(conn->sock, F_SETFL, O_NONBLOCK);
	/*#endif*/
#else
	iMode = HSOCKET_NONBLOCKMODE;
	if(ioctlsocket(conn->sock, FIONBIO, (u_long FAR*) &iMode) == INVALID_SOCKET)
	{
		log_error1("ioctlsocket error");
		return -1;
	}

#endif

	/* check method */
	if (method == HTTP_REQUEST_GET) {

		/* Set GET Header  */
		sprintf(buffer, "GET %s HTTP/1.1\r\n", 
			(url->context)?url->context:("/"));

	} else if (method == HTTP_REQUEST_POST) {

		/* Set POST Header  */
		sprintf(buffer, "POST %s HTTP/1.1\r\n", 
			(url->context)?url->context:("/"));
	} else {

		log_error1("Unknown method type!");
		return 15;
	}

	status = hsocket_send(conn->sock, buffer);
	if (status != HSOCKET_OK) {
		log_error2("Can not send request (status:%d)", status);
		hsocket_close(conn->sock);
		return 4;
	}

	/* Send Header */
	status = httpc_send_header(conn);
	if (status != HSOCKET_OK) {
		log_error2("Can not send header (status:%d)", status);
		hsocket_close(conn->sock);
		return 5;
	}

	return status;

}


/*--------------------------------------------------
FUNCTION: httpc_get_cb
DESC: Wraps the httpc_talk_to_server() function
to communicate with GET method. 

See the documentation of httpc_talk_to_server()
for more information.
----------------------------------------------------*/
int httpc_get_cb(httpc_conn_t *conn, const char *urlstr, 
				 httpc_response_start_callback start_cb,
				 httpc_response_callback cb, void *userdata)
{
	int status;

	status = httpc_talk_to_server(HTTP_REQUEST_GET, conn, urlstr);

	if (status != HSOCKET_OK)
		return status;

	status = httpc_receive_response(conn, start_cb, cb, userdata);
	return status;
}



/*--------------------------------------------------
FUNCTION: httpc_post_cb
DESC: Wraps the httpc_talk_to_server() function
to communicate with POST method. 

See the documentation of httpc_talk_to_server()
for more information.

TODO: Add post content rutine
----------------------------------------------------*/
int httpc_post_cb(httpc_conn_t *conn, const char *urlstr, 
				  httpc_response_start_callback start_cb,
				  httpc_response_callback cb, int content_size, 
				  char *content,  void *userdata)
{
	int status;
	char buffer[255];

	sprintf(buffer, "%d", content_size);
	httpc_set_header(conn, HEADER_CONTENT_LENGTH, buffer);

	status = httpc_talk_to_server(HTTP_REQUEST_POST, conn, urlstr);
	if (status != HSOCKET_OK) 
		return status; 

	status = hsocket_nsend(conn->sock, content, content_size);
	if (status != HSOCKET_OK)
		return status;

	status = httpc_receive_response(conn, start_cb, cb, userdata); 
	return status; 
}


/*======================================================
The following  functions are used internally to wrap 
the httpc_x_cb (x = get|post)  functions. 
======================================================*/
static
void httpc_custom_res_callback(int counter, httpc_conn_t* conn,
							   void *userdata, int size, char *buffer)
{
	hresponse_t *res;

	/* get response object */
	res = (hresponse_t*)userdata;

	/* allocate buffersize */

	res->bodysize += size;
	res->body = (char *)realloc(res->body, res->bodysize + 1);

	memcpy(&(res->body[res->bodysize-size]), buffer, size);
	res->body[res->bodysize]='\0';
}


static 
void httpc_custom_start_callback(httpc_conn_t *conn, void *userdata, 
								 hpair_t *header, const char *spec,
								 int errcode, const char *desc)
{
	hresponse_t *res;

	/* get response object */
	res = (hresponse_t*)userdata;

	/* set spec */
	if (spec != NULL) {
		strcpy(res->spec, spec);
	}

	/* set errcode */
	res->errcode = errcode;

	/* set desc */
	if (desc != NULL) {
		res->desc = (char*)malloc(strlen(desc)+1);
		strcpy(res->desc, desc);
	}

	/* set header */
	if (header == NULL) {
		log_warn1("header is NULL!");
	}

	res->header = hpairnode_copy_deep(header);
}


/*--------------------------------------------------
FUNCTION: httpc_get
----------------------------------------------------*/
hresponse_t *httpc_get(httpc_conn_t *conn, const char *url)
{
	int status;
	hresponse_t *res;

	res = hresponse_new();
	status = httpc_get_cb(conn, url, httpc_custom_start_callback,
		httpc_custom_res_callback, res);

	if (status != 0) {
		hresponse_free(res);
		return NULL;
	}

	return res;
} 


/*--------------------------------------------------
FUNCTION: httpc_post
----------------------------------------------------*/
hresponse_t *httpc_post(httpc_conn_t *conn, const char *url, 
						int content_size, const char *content)
{ 
	int status;
	hresponse_t *res;

	res = hresponse_new();
	status = httpc_post_cb(conn, url, httpc_custom_start_callback,
		httpc_custom_res_callback, content_size,
		(char *)content, res);

	if (status != 0) {
		hresponse_free(res);
		return NULL;
	}

	return res;
} 



/*
POST Module
*/



/*--------------------------------------------------
FUNCTION: httpc_post_open
----------------------------------------------------*/
int httpc_post_open(httpc_conn_t *conn, const char *urlstr)
{
	int status;

	httpc_set_header(conn, HEADER_TRANSFER_ENCODING, "chunked");

	status = httpc_talk_to_server(HTTP_REQUEST_POST, conn, urlstr);
	return status;
}


/*--------------------------------------------------
FUNCTION: httpc_post_send
----------------------------------------------------*/
int httpc_post_send(httpc_conn_t *conn, 
					const char* buffer, 
					int bufsize)
{
	char hexsize[100]; /* chunk size in hex */
	int status;

	sprintf(hexsize, "%x\r\n", bufsize); 

	status = hsocket_send(conn->sock, hexsize);
	if (status != HSOCKET_OK) 
		return status;

	status = hsocket_nsend(conn->sock, buffer, bufsize);
	if (status != HSOCKET_OK) 
		return status;

	status = hsocket_send(conn->sock, "\r\n");

	return status;
}

/*--------------------------------------------------
FUNCTION: httpc_post_finish_cb
----------------------------------------------------*/
int httpc_post_finish_cb(httpc_conn_t *conn, 
						 httpc_response_start_callback start_cb,
						 httpc_response_callback cb, 
						 void *userdata)
{
	int status;

	status = hsocket_send(conn->sock, "0\r\n\r\n");
	if (status != HSOCKET_OK) return status;

	status = httpc_receive_response(conn, start_cb, cb, userdata); 
	return status; 
}

/*--------------------------------------------------
FUNCTION: httpc_post_finish
----------------------------------------------------*/
hresponse_t *httpc_post_finish(httpc_conn_t *conn)
{
	int status;
	hresponse_t *res;

	res = hresponse_new();
	status = httpc_post_finish_cb(conn, httpc_custom_start_callback,
		httpc_custom_res_callback, res);

	if (status != 0) {
		hresponse_free(res);
		return NULL;
	}

	return res;  
}