-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathmg_core.c
More file actions
2454 lines (2135 loc) · 76.5 KB
/
mg_core.c
File metadata and controls
2454 lines (2135 loc) · 76.5 KB
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
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// Copyright (c) 2004-2013 Sergey Lyubka
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include "mg_core.h"
const char *mg_version(void) {
return MONGOOSE_VERSION;
}
#define REPLACE_MG_LIBC_C "mg_libc.c"
#define REPLACE_MG_STRING_C "mg_string.c"
#define REPLACE_MG_SOCKET_C "mg_socket.c"
#define REPLACE_MG_FILE_C "mg_file.c"
REPLACE_STATIC void *call_user(struct mg_connection *conn, enum mg_event event) {
if (conn != NULL && conn->ctx != NULL) {
conn->request_info.user_data = conn->ctx->user_data;
}
return conn == NULL || conn->ctx == NULL || conn->ctx->user_callback == NULL ?
NULL : conn->ctx->user_callback(event, conn);
}
// Print error message to the opened error log stream.
void cry(struct mg_connection *conn, const char *fmt, ...) {
char buf[MG_BUF_LEN], src_addr[20];
va_list ap;
FILE *fp;
time_t timestamp;
va_start(ap, fmt);
(void) vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
// Do not lock when getting the callback value, here and below.
// I suppose this is fine, since function cannot disappear in the
// same way string option can.
conn->request_info.ev_data = buf;
if (call_user(conn, MG_EVENT_LOG) == NULL) {
fp = conn->ctx == NULL || conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");
if (fp != NULL) {
flockfile(fp);
timestamp = time(NULL);
sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp,
src_addr);
if (conn->request_info.request_method != NULL) {
fprintf(fp, "%s %s: ", conn->request_info.request_method,
conn->request_info.uri);
}
fprintf(fp, "%s", buf);
fputc('\n', fp);
funlockfile(fp);
fclose(fp);
}
}
conn->request_info.ev_data = NULL;
}
// Return fake connection structure. Used for logging, if connection
// is not applicable at the moment of logging.
REPLACE_STATIC struct mg_connection *fc(struct mg_context *ctx) {
static struct mg_connection fake_connection;
fake_connection.ctx = ctx;
return &fake_connection;
}
struct mg_request_info *mg_get_request_info(struct mg_connection *conn) {
return &conn->request_info;
}
// Return HTTP header value, or NULL if not found.
REPLACE_STATIC const char *get_header(const struct mg_request_info *ri,
const char *name) {
int i;
for (i = 0; i < ri->num_headers; i++)
if (!mg_strcasecmp(name, ri->http_headers[i].name))
return ri->http_headers[i].value;
return NULL;
}
const char *mg_get_header(const struct mg_connection *conn, const char *name) {
return get_header(&conn->request_info, name);
}
// HTTP 1.1 assumes keep alive if "Connection:" header is not set
// This function must tolerate situations when connection info is not
// set up, for example if request parsing failed.
static int should_keep_alive(const struct mg_connection *conn) {
const char *http_version = conn->request_info.http_version;
const char *header = mg_get_header(conn, "Connection");
if (conn->must_close ||
conn->status_code == 401 ||
mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 ||
(header != NULL && mg_strcasecmp(header, "keep-alive") != 0) ||
(header == NULL && http_version && strcmp(http_version, "1.1"))) {
return 0;
}
return 1;
}
static const char *suggest_connection_header(const struct mg_connection *conn) {
return should_keep_alive(conn) ? "keep-alive" : "close";
}
REPLACE_STATIC void send_http_error(struct mg_connection *conn, int status,
const char *reason, const char *fmt, ...) {
char buf[MG_BUF_LEN];
va_list ap;
int len;
conn->status_code = status;
conn->request_info.ev_data = (void *) (long) status;
if (call_user(conn, MG_HTTP_ERROR) == NULL) {
buf[0] = '\0';
len = 0;
// Errors 1xx, 204 and 304 MUST NOT send a body
if (status > 199 && status != 204 && status != 304) {
len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);
buf[len++] = '\n';
va_start(ap, fmt);
len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);
va_end(ap);
}
DEBUG_TRACE(("[%s]", buf));
mg_printf(conn, "HTTP/1.1 %d %s\r\n"
"Content-Length: %d\r\n"
"Connection: %s\r\n\r\n", status, reason, len,
suggest_connection_header(conn));
conn->num_bytes_sent += mg_printf(conn, "%s", buf);
}
}
#if defined(_WIN32) && !defined(__SYMBIAN32__)
#define REPLACE_MG_OS_C "mg_win32.c"
#else
#define REPLACE_MG_OS_C "mg_unix.c"
#endif // _WIN32
// Write data to the IO channel - opened file descriptor, socket or SSL
// descriptor. Return number of bytes written.
static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
int64_t len) {
int64_t sent;
int n, k;
sent = 0;
while (sent < len) {
// How many bytes we send in this iteration
k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
if (ssl != NULL) {
n = SSL_write(ssl, buf + sent, k);
} else if (fp != NULL) {
n = (int) fwrite(buf + sent, 1, (size_t) k, fp);
if (ferror(fp))
n = -1;
} else {
n = send(sock, buf + sent, (size_t) k, MSG_NOSIGNAL);
}
if (n < 0)
break;
sent += n;
}
return sent;
}
// This function is needed to prevent Mongoose to be stuck in a blocking
// socket read when user requested exit. To do that, we sleep in select
// with a timeout, and when returned, check the context for the stop flag.
// If it is set, we return 0, and this means that we must not continue
// reading, must give up and close the connection and exit serving thread.
static int wait_until_socket_is_readable(struct mg_connection *conn) {
int result;
struct timeval tv;
fd_set set;
do {
tv.tv_sec = 0;
tv.tv_usec = 300 * 1000;
FD_ZERO(&set);
FD_SET(conn->client.sock, &set);
result = select(conn->client.sock + 1, &set, NULL, NULL, &tv);
if(result == 0 && conn->ssl != NULL) {
result = SSL_pending(conn->ssl);
}
} while ((result == 0 || (result < 0 && ERRNO == EINTR)) &&
conn->ctx->stop_flag == 0);
return conn->ctx->stop_flag || result < 0 ? 0 : 1;
}
// Read from IO channel - opened file descriptor, socket, or SSL descriptor.
// Return negative value on error, or number of bytes read on success.
static int pull(FILE *fp, struct mg_connection *conn, char *buf, int len) {
int nread;
if (fp != NULL) {
// Use read() instead of fread(), because if we're reading from the CGI
// pipe, fread() may block until IO buffer is filled up. We cannot afford
// to block and must pass all read bytes immediately to the client.
nread = read(fileno(fp), buf, (size_t) len);
} else if (!conn->must_close && !wait_until_socket_is_readable(conn)) {
nread = -1;
} else if (conn->ssl != NULL) {
nread = SSL_read(conn->ssl, buf, len);
} else {
nread = recv(conn->client.sock, buf, (size_t) len, 0);
}
return conn->ctx->stop_flag ? -1 : nread;
}
int mg_read(struct mg_connection *conn, void *buf, size_t len) {
int n, buffered_len, nread;
const char *body;
nread = 0;
if (conn->consumed_content < conn->content_len) {
// Adjust number of bytes to read.
int64_t to_read = conn->content_len - conn->consumed_content;
if (to_read < (int64_t) len) {
len = (size_t) to_read;
}
// Return buffered data
body = conn->buf + conn->request_len + conn->consumed_content;
buffered_len = &conn->buf[conn->data_len] - body;
if (buffered_len > 0) {
if (len < (size_t) buffered_len) {
buffered_len = (int) len;
}
memcpy(buf, body, (size_t) buffered_len);
len -= buffered_len;
conn->consumed_content += buffered_len;
nread += buffered_len;
buf = (char *) buf + buffered_len;
}
// We have returned all buffered data. Read new data from the remote socket.
while (len > 0) {
n = pull(NULL, conn, (char *) buf, (int) len);
if (n < 0) {
nread = n; // Propagate the error
break;
} else if (n == 0) {
break; // No more data to read
} else {
buf = (char *) buf + n;
conn->consumed_content += n;
nread += n;
len -= n;
}
}
}
return nread;
}
int mg_write(struct mg_connection *conn, const void *buf, size_t len) {
time_t now;
int64_t n, total, allowed;
if (conn->throttle > 0) {
if ((now = time(NULL)) != conn->last_throttle_time) {
conn->last_throttle_time = now;
conn->last_throttle_bytes = 0;
}
allowed = conn->throttle - conn->last_throttle_bytes;
if (allowed > (int64_t) len) {
allowed = len;
}
if ((total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
(int64_t) allowed)) == allowed) {
buf = (char *) buf + total;
conn->last_throttle_bytes += total;
while (total < (int64_t) len && conn->ctx->stop_flag == 0) {
allowed = conn->throttle > (int64_t) len - total ?
(int64_t) len - total : conn->throttle;
if ((n = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
(int64_t) allowed)) != allowed) {
break;
}
sleep(1);
conn->last_throttle_bytes = allowed;
conn->last_throttle_time = time(NULL);
buf = (char *) buf + n;
total += n;
}
}
} else {
total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
(int64_t) len);
}
return (int) total;
}
int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
char mem[MG_BUF_LEN], *buf = mem;
int len;
va_list ap;
// Print in a local buffer first, hoping that it is large enough to
// hold the whole message
va_start(ap, fmt);
len = vsnprintf(mem, sizeof(mem), fmt, ap);
va_end(ap);
if (len == 0) {
// Do nothing. mg_printf(conn, "%s", "") was called.
} else if (len < 0) {
// vsnprintf() error, give up
len = -1;
cry(conn, "%s(%s, ...): vsnprintf() error", __func__, fmt);
} else if (len > (int) sizeof(mem) && (buf = (char *) malloc(len + 1)) != NULL) {
// Local buffer is not large enough, allocate big buffer on heap
va_start(ap, fmt);
vsnprintf(buf, len + 1, fmt, ap);
va_end(ap);
len = mg_write(conn, buf, (size_t) len);
free(buf);
} else if (len > (int) sizeof(mem)) {
// Failed to allocate large enough buffer, give up
cry(conn, "%s(%s, ...): Can't allocate %d bytes, not printing anything",
__func__, fmt, len);
len = -1;
} else {
// Copy to the local buffer succeeded
len = mg_write(conn, buf, (size_t) len);
}
return len;
}
int mg_get_var(const char *data, size_t data_len, const char *name,
char *dst, size_t dst_len) {
const char *p, *e, *s;
size_t name_len;
int len;
if (dst == NULL || dst_len == 0) {
len = -2;
} else if (data == NULL || name == NULL || data_len == 0) {
len = -1;
dst[0] = '\0';
} else {
name_len = strlen(name);
e = data + data_len;
len = -1;
dst[0] = '\0';
// data is "var1=val1&var2=val2...". Find variable first
for (p = data; p + name_len < e; p++) {
if ((p == data || p[-1] == '&') && p[name_len] == '=' &&
!mg_strncasecmp(name, p, name_len)) {
// Point p to variable value
p += name_len + 1;
// Point s to the end of the value
s = (const char *) memchr(p, '&', (size_t)(e - p));
if (s == NULL) {
s = e;
}
assert(s >= p);
// Decode variable into destination buffer
len = url_decode(p, (size_t)(s - p), dst, dst_len, 1);
// Redirect error code from -1 to -2 (destination buffer too small).
if (len == -1) {
len = -2;
}
break;
}
}
}
return len;
}
int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name,
char *dst, size_t dst_size) {
const char *s, *p, *end;
int name_len, len = -1;
if (dst == NULL || dst_size == 0) {
len = -2;
} else if (cookie_name == NULL || (s = mg_get_header(conn, "Cookie")) == NULL) {
len = -1;
dst[0] = '\0';
} else {
name_len = (int) strlen(cookie_name);
end = s + strlen(s);
dst[0] = '\0';
for (; (s = strstr(s, cookie_name)) != NULL; s += name_len) {
if (s[name_len] == '=') {
s += name_len + 1;
if ((p = strchr(s, ' ')) == NULL)
p = end;
if (p[-1] == ';')
p--;
if (*s == '"' && p[-1] == '"' && p > s + 1) {
s++;
p--;
}
if ((size_t) (p - s) < dst_size) {
len = p - s;
mg_strlcpy(dst, s, (size_t) len + 1);
} else {
len = -2;
}
break;
}
}
}
return len;
}
static void convert_uri_to_file_name(struct mg_connection *conn, char *buf,
size_t buf_len, struct file *filep) {
struct vec a, b;
const char *rewrite, *uri = conn->request_info.uri;
char *p;
int match_len;
// Using buf_len - 1 because memmove() for PATH_INFO may shift part
// of the path one byte on the right.
mg_snprintf(conn, buf, buf_len - 1, "%s%s", conn->ctx->config[DOCUMENT_ROOT],
uri);
rewrite = conn->ctx->config[REWRITE];
while ((rewrite = next_option(rewrite, &a, &b)) != NULL) {
if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) {
mg_snprintf(conn, buf, buf_len - 1, "%.*s%s", (int) b.len, b.ptr,
uri + match_len);
break;
}
}
if (!mg_stat(conn, buf, filep)) {
// Support PATH_INFO for CGI scripts.
for (p = buf + strlen(buf); p > buf + 1; p--) {
if (*p == '/') {
*p = '\0';
if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
strlen(conn->ctx->config[CGI_EXTENSIONS]), buf) > 0 &&
mg_stat(conn, buf, filep)) {
// Shift PATH_INFO block one character right, e.g.
// "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00"
// conn->path_info is pointing to the local variable "path" declared
// in handle_request(), so PATH_INFO is not valid after
// handle_request returns.
conn->path_info = p + 1;
memmove(p + 2, p + 1, strlen(p + 1) + 1); // +1 is for trailing \0
p[1] = '/';
break;
} else {
*p = '/';
}
}
}
}
}
static int sslize(struct mg_connection *conn, SSL_CTX *s, int (*func)(SSL *)) {
return (conn->ssl = SSL_new(s)) != NULL &&
SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
func(conn->ssl) == 1;
}
static const struct {
const char *extension;
size_t ext_len;
const char *mime_type;
} builtin_mime_types[] = {
{".html", 5, "text/html"},
{".htm", 4, "text/html"},
{".shtm", 5, "text/html"},
{".shtml", 6, "text/html"},
{".css", 4, "text/css"},
{".js", 3, "application/x-javascript"},
{".ico", 4, "image/x-icon"},
{".gif", 4, "image/gif"},
{".jpg", 4, "image/jpeg"},
{".jpeg", 5, "image/jpeg"},
{".png", 4, "image/png"},
{".svg", 4, "image/svg+xml"},
{".txt", 4, "text/plain"},
{".torrent", 8, "application/x-bittorrent"},
{".wav", 4, "audio/x-wav"},
{".mp3", 4, "audio/x-mp3"},
{".mid", 4, "audio/mid"},
{".m3u", 4, "audio/x-mpegurl"},
{".ogg", 4, "audio/ogg"},
{".ram", 4, "audio/x-pn-realaudio"},
{".xml", 4, "text/xml"},
{".json", 5, "text/json"},
{".xslt", 5, "application/xml"},
{".xsl", 4, "application/xml"},
{".ra", 3, "audio/x-pn-realaudio"},
{".doc", 4, "application/msword"},
{".exe", 4, "application/octet-stream"},
{".zip", 4, "application/x-zip-compressed"},
{".xls", 4, "application/excel"},
{".tgz", 4, "application/x-tar-gz"},
{".tar", 4, "application/x-tar"},
{".gz", 3, "application/x-gunzip"},
{".arj", 4, "application/x-arj-compressed"},
{".rar", 4, "application/x-arj-compressed"},
{".rtf", 4, "application/rtf"},
{".pdf", 4, "application/pdf"},
{".swf", 4, "application/x-shockwave-flash"},
{".mpg", 4, "video/mpeg"},
{".webm", 5, "video/webm"},
{".mpeg", 5, "video/mpeg"},
{".mp4", 4, "video/mp4"},
{".m4v", 4, "video/x-m4v"},
{".asf", 4, "video/x-ms-asf"},
{".avi", 4, "video/x-msvideo"},
{".bmp", 4, "image/bmp"},
{NULL, 0, NULL}
};
const char *mg_get_builtin_mime_type(const char *path) {
const char *ext;
size_t i, path_len;
path_len = strlen(path);
for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
ext = path + (path_len - builtin_mime_types[i].ext_len);
if (path_len > builtin_mime_types[i].ext_len &&
mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
return builtin_mime_types[i].mime_type;
}
}
return "text/plain";
}
// Look at the "path" extension and figure what mime type it has.
// Store mime type in the vector.
static void get_mime_type(struct mg_context *ctx, const char *path,
struct vec *vec) {
struct vec ext_vec, mime_vec;
const char *list, *ext;
size_t path_len;
path_len = strlen(path);
// Scan user-defined mime types first, in case user wants to
// override default mime types.
list = ctx->config[EXTRA_MIME_TYPES];
while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
// ext now points to the path suffix
ext = path + path_len - ext_vec.len;
if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
*vec = mime_vec;
return;
}
}
vec->ptr = mg_get_builtin_mime_type(path);
vec->len = strlen(vec->ptr);
}
// Check the user's password, return 1 if OK
static int check_password(const char *method, const char *ha1, const char *uri,
const char *nonce, const char *nc, const char *cnonce,
const char *qop, const char *response) {
char ha2[32 + 1], expected_response[32 + 1];
// Some of the parameters may be NULL
if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL ||
qop == NULL || response == NULL) {
return 0;
}
// NOTE(lsm): due to a bug in MSIE, we do not compare the URI
// TODO(lsm): check for authentication timeout
if (// strcmp(dig->uri, c->ouri) != 0 ||
strlen(response) != 32
// || now - strtoul(dig->nonce, NULL, 10) > 3600
) {
return 0;
}
mg_md5(ha2, method, ":", uri, NULL);
mg_md5(expected_response, ha1, ":", nonce, ":", nc,
":", cnonce, ":", qop, ":", ha2, NULL);
return mg_strcasecmp(response, expected_response) == 0;
}
// Use the global passwords file, if specified by auth_gpass option,
// or search for .htpasswd in the requested directory.
static void open_auth_file(struct mg_connection *conn, const char *path,
struct file *filep) {
char name[PATH_MAX];
const char *p, *e, *gpass = conn->ctx->config[GLOBAL_PASSWORDS_FILE];
if (gpass != NULL) {
// Use global passwords file
if (!mg_fopen(conn, gpass, "r", filep)) {
cry(conn, "fopen(%s): %s", gpass, strerror(ERRNO));
}
} else if (mg_stat(conn, path, filep) && filep->is_directory) {
mg_snprintf(conn, name, sizeof(name), "%s%c%s",
path, '/', PASSWORDS_FILE_NAME);
mg_fopen(conn, name, "r", filep);
} else {
// Try to find .htpasswd in requested directory.
for (p = path, e = p + strlen(p) - 1; e > p; e--)
if (e[0] == '/')
break;
mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
(int) (e - p), p, '/', PASSWORDS_FILE_NAME);
mg_fopen(conn, name, "r", filep);
}
}
// Parsed Authorization header
struct ah {
char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
};
// Return 1 on success. Always initializes the ah structure.
static int parse_auth_header(struct mg_connection *conn, char *buf,
size_t buf_size, struct ah *ah) {
char *name, *value, *s;
const char *auth_header;
(void) memset(ah, 0, sizeof(*ah));
if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
return 0;
}
// Make modifiable copy of the auth header
(void) mg_strlcpy(buf, auth_header + 7, buf_size);
s = buf;
// Parse authorization header
for (;;) {
// Gobble initial spaces
while (isspace(* (unsigned char *) s)) {
s++;
}
name = skip_quoted(&s, "=", " ", 0);
// Value is either quote-delimited, or ends at first comma or space.
if (s[0] == '\"') {
s++;
value = skip_quoted(&s, "\"", " ", '\\');
if (s[0] == ',') {
s++;
}
} else {
value = skip_quoted(&s, ", ", " ", 0); // IE uses commas, FF uses spaces
}
if (*name == '\0') {
break;
}
if (!strcmp(name, "username")) {
ah->user = value;
} else if (!strcmp(name, "cnonce")) {
ah->cnonce = value;
} else if (!strcmp(name, "response")) {
ah->response = value;
} else if (!strcmp(name, "uri")) {
ah->uri = value;
} else if (!strcmp(name, "qop")) {
ah->qop = value;
} else if (!strcmp(name, "nc")) {
ah->nc = value;
} else if (!strcmp(name, "nonce")) {
ah->nonce = value;
}
}
// CGI needs it as REMOTE_USER
if (ah->user != NULL) {
conn->request_info.remote_user = mg_strdup(ah->user);
} else {
return 0;
}
return 1;
}
// Authorize against the opened passwords file. Return 1 if authorized.
static int authorize(struct mg_connection *conn, struct file *filep) {
struct ah ah;
char line[256], f_user[256], ha1[256], f_domain[256], buf[MG_BUF_LEN], *p;
if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {
return 0;
}
// Loop over passwords file
p = (char *) filep->membuf;
while (mg_fgets(line, sizeof(line), filep, &p) != NULL) {
if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {
continue;
}
if (!strcmp(ah.user, f_user) &&
!strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))
return check_password(conn->request_info.request_method, ha1, ah.uri,
ah.nonce, ah.nc, ah.cnonce, ah.qop, ah.response);
}
return 0;
}
// Return 1 if request is authorised, 0 otherwise.
static int check_authorization(struct mg_connection *conn, const char *path) {
char fname[PATH_MAX];
struct vec uri_vec, filename_vec;
const char *list;
struct file file = STRUCT_FILE_INITIALIZER;
int authorized = 1;
list = conn->ctx->config[PROTECT_URI];
while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
mg_snprintf(conn, fname, sizeof(fname), "%.*s",
(int) filename_vec.len, filename_vec.ptr);
if (!mg_fopen(conn, fname, "r", &file)) {
cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));
}
break;
}
}
if (!is_file_opened(&file)) {
open_auth_file(conn, path, &file);
}
if (is_file_opened(&file)) {
authorized = authorize(conn, &file);
mg_fclose(&file);
}
return authorized;
}
static void send_authorization_request(struct mg_connection *conn) {
conn->status_code = 401;
mg_printf(conn,
"HTTP/1.1 401 Unauthorized\r\n"
"Content-Length: 0\r\n"
"WWW-Authenticate: Digest qop=\"auth\", "
"realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
conn->ctx->config[AUTHENTICATION_DOMAIN],
(unsigned long) time(NULL));
}
static int is_authorized_for_put(struct mg_connection *conn) {
struct file file = STRUCT_FILE_INITIALIZER;
const char *passfile = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE];
int ret = 0;
if (passfile != NULL && mg_fopen(conn, passfile, "r", &file)) {
ret = authorize(conn, &file);
mg_fclose(&file);
}
return ret;
}
int mg_modify_passwords_file(const char *fname, const char *domain,
const char *user, const char *pass) {
int found;
char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];
FILE *fp, *fp2;
found = 0;
fp = fp2 = NULL;
// Regard empty password as no password - remove user record.
if (pass != NULL && pass[0] == '\0') {
pass = NULL;
}
(void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
// Create the file if does not exist
if ((fp = fopen(fname, "a+")) != NULL) {
(void) fclose(fp);
}
// Open the given file and temporary file
if ((fp = fopen(fname, "r")) == NULL) {
return 0;
} else if ((fp2 = fopen(tmp, "w+")) == NULL) {
fclose(fp);
return 0;
}
// Copy the stuff to temporary file
while (fgets(line, sizeof(line), fp) != NULL) {
if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {
continue;
}
if (!strcmp(u, user) && !strcmp(d, domain)) {
found++;
if (pass != NULL) {
mg_md5(ha1, user, ":", domain, ":", pass, NULL);
fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
}
} else {
fprintf(fp2, "%s", line);
}
}
// If new user, just add it
if (!found && pass != NULL) {
mg_md5(ha1, user, ":", domain, ":", pass, NULL);
fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
}
// Close files
fclose(fp);
fclose(fp2);
// Put the temp file in place of real file
remove(fname);
rename(tmp, fname);
return 1;
}
// Send len bytes from the opened file to the client.
REPLACE_STATIC void send_file_data(struct mg_connection *conn, struct file *filep,
int64_t offset, int64_t len) {
char buf[MG_BUF_LEN];
int to_read, num_read, num_written;
if (len > 0 && filep->membuf != NULL && filep->size > 0) {
if (len > filep->size - offset) {
len = filep->size - offset;
}
mg_write(conn, filep->membuf + offset, (size_t) len);
} else if (len > 0 && filep->fp != NULL) {
fseeko(filep->fp, offset, SEEK_SET);
while (len > 0) {
// Calculate how much to read from the file in the buffer
to_read = sizeof(buf);
if ((int64_t) to_read > len) {
to_read = (int) len;
}
// Read from file, exit the loop on error
if ((num_read = fread(buf, 1, (size_t) to_read, filep->fp)) <= 0) {
break;
}
// Send read bytes to the client, exit the loop on error
if ((num_written = mg_write(conn, buf, (size_t) num_read)) != num_read) {
break;
}
// Both read and were successful, adjust counters
conn->num_bytes_sent += num_written;
len -= num_written;
}
}
}
static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
}
static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
}
static void construct_etag(char *buf, size_t buf_len,
const struct file *filep) {
snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
(unsigned long) filep->modification_time, filep->size);
}
static void handle_file_request(struct mg_connection *conn, const char *path,
struct file *filep) {
char date[64], lm[64], etag[64], range[64];
const char *msg = "OK", *hdr;
time_t curtime = time(NULL);
int64_t cl, r1, r2;
struct vec mime_vec;
int n;
get_mime_type(conn->ctx, path, &mime_vec);
cl = filep->size;
conn->status_code = 200;
range[0] = '\0';
if (!mg_fopen(conn, path, "rb", filep)) {
send_http_error(conn, 500, http_500_error,
"fopen(%s): %s", path, strerror(ERRNO));
return;
}
fclose_on_exec(filep);
// If Range: header specified, act accordingly
r1 = r2 = 0;
hdr = mg_get_header(conn, "Range");
if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 &&
r1 >= 0 && r2 > 0) {
conn->status_code = 206;
cl = n == 2 ? (r2 > cl ? cl : r2) - r1 + 1: cl - r1;
mg_snprintf(conn, range, sizeof(range),
"Content-Range: bytes "
"%" INT64_FMT "-%"
INT64_FMT "/%" INT64_FMT "\r\n",
r1, r1 + cl - 1, filep->size);
msg = "Partial Content";
}
// Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
gmt_time_string(date, sizeof(date), &curtime);
gmt_time_string(lm, sizeof(lm), &filep->modification_time);
construct_etag(etag, sizeof(etag), filep);
(void) mg_printf(conn,
"HTTP/1.1 %d %s\r\n"
"Date: %s\r\n"
"Last-Modified: %s\r\n"
"Etag: %s\r\n"
"Content-Type: %.*s\r\n"
"Content-Length: %" INT64_FMT "\r\n"
"Connection: %s\r\n"
"Accept-Ranges: bytes\r\n"
"%s\r\n",
conn->status_code, msg, date, lm, etag, (int) mime_vec.len,
mime_vec.ptr, cl, suggest_connection_header(conn), range);
if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
send_file_data(conn, filep, r1, cl);
}
mg_fclose(filep);
}
void mg_send_file(struct mg_connection *conn, const char *path) {
struct file file;
if (mg_stat(conn, path, &file)) {
handle_file_request(conn, path, &file);
} else {
send_http_error(conn, 404, "Not Found", "%s", "File not found");
}
}
// Parse HTTP headers from the given buffer, advance buffer to the point
// where parsing stopped.
REPLACE_STATIC void parse_http_headers(char **buf, struct mg_request_info *ri) {
int i;
for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
ri->http_headers[i].value = skip(buf, "\r\n");
if (ri->http_headers[i].name[0] == '\0')
break;
ri->num_headers = i + 1;