summaryrefslogtreecommitdiffstats
path: root/cpukit/mghttpd/mongoose.c
blob: 24ce2cae0af10001c7562949fd2a2277db4a4f99 (plain) (blame)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
/*
 * Copyright (c) 2004-2009 Sergey Lyubka
 * Portions Copyright (c) 2009 Gilbert Wellisch
 *
 * 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.
 */

#if HAVE_CONFIG_H
#include "config.h"
#endif

#if defined(_WIN32)
#define _CRT_SECURE_NO_WARNINGS	/* Disable deprecation warning in VS2005 */
#endif /* _WIN32 */

#ifndef _WIN32_WCE /* Some ANSI #includes are not available on Windows CE */
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#endif /* !_WIN32_WCE */

#include <time.h>
#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>

#if defined(_WIN32)		/* Windows specific #includes and #defines */
#define	_WIN32_WINNT	0x0400	/* To make it link in VS2005 */
#include <windows.h>

#ifndef _WIN32_WCE
#include <process.h>
#include <direct.h>
#include <io.h>
#else /* _WIN32_WCE */
/* Windows CE-specific definitions */
#include <winsock2.h>
#define NO_CGI	/* WinCE has no pipes */
#define NO_SSI	/* WinCE has no pipes */

#define FILENAME_MAX	MAX_PATH
#define BUFSIZ		4096
typedef long off_t;

#define errno			GetLastError()
#define strerror(x)		_ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10)
#endif /* _WIN32_WCE */

#define EPOCH_DIFF	0x019DB1DED53E8000 /* 116444736000000000 nsecs */
#define RATE_DIFF	10000000 /* 100 nsecs */
#define MAKEUQUAD(lo, hi)	((uint64_t)(((uint32_t)(lo)) | \
				((uint64_t)((uint32_t)(hi))) << 32))
#define	SYS2UNIX_TIME(lo, hi) \
	(time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF)

/*
 * Visual Studio 6 does not know __func__ or __FUNCTION__
 * The rest of MS compilers use __FUNCTION__, not C99 __func__
 * Also use _strtoui64 on modern M$ compilers
 */
#if defined(_MSC_VER) && _MSC_VER < 1300
#define	STRX(x)			#x
#define	STR(x)			STRX(x)
#define	__func__		"line " STR(__LINE__)
#define	strtoull(x, y, z)	strtoul(x, y, z)
#else
#define	__func__		__FUNCTION__
#define	strtoull(x, y, z)	_strtoui64(x, y, z)
#endif /* _MSC_VER */

#define	ERRNO			GetLastError()
#define	NO_SOCKLEN_T
#define	SSL_LIB			"ssleay32.dll"
#define	CRYPTO_LIB		"libeay32.dll"
#define	DIRSEP			'\\'
#define	IS_DIRSEP_CHAR(c)	((c) == '/' || (c) == '\\')
#define	O_NONBLOCK		0
#define	EWOULDBLOCK		WSAEWOULDBLOCK
#define	_POSIX_
#define INT64_FMT		"I64"

#define	SHUT_WR			1
#define	snprintf		_snprintf
#define	vsnprintf		_vsnprintf
#define	sleep(x)		Sleep((x) * 1000)

#define	popen(x, y)		_popen(x, y)
#define	pclose(x)		_pclose(x)
#define	close(x)		_close(x)
#define	dlsym(x,y)		GetProcAddress((HINSTANCE) (x), (y))
#define	RTLD_LAZY		0
#define	fseeko(x, y, z)		fseek((x), (y), (z))
#define	fdopen(x, y)		_fdopen((x), (y))
#define	write(x, y, z)		_write((x), (y), (unsigned) z)
#define	read(x, y, z)		_read((x), (y), (unsigned) z)
#define	flockfile(x)		(void) 0
#define	funlockfile(x)		(void) 0

#if !defined(fileno)
#define	fileno(x)		_fileno(x)
#endif /* !fileno MINGW #defines fileno */

typedef HANDLE pthread_mutex_t;
typedef HANDLE pthread_cond_t;
typedef DWORD pthread_t;
#define pid_t HANDLE	/* MINGW typedefs pid_t to int. Using #define here. */

struct timespec {
	long tv_nsec;
	long tv_sec;
};

static int pthread_mutex_lock(pthread_mutex_t *);
static int pthread_mutex_unlock(pthread_mutex_t *);

#if defined(HAVE_STDINT)
#include <stdint.h>
#else
typedef unsigned int		uint32_t;
typedef unsigned short		uint16_t;
typedef unsigned __int64	uint64_t;
typedef __int64			int64_t;
#define	INT64_MAX		9223372036854775807
#endif /* HAVE_STDINT */

/*
 * POSIX dirent interface
 */
struct dirent {
	char	d_name[FILENAME_MAX];
};

typedef struct DIR {
	HANDLE			handle;
	WIN32_FIND_DATAW	info;
	struct dirent		result;
} DIR;

#else				/* UNIX  specific	*/
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/select.h>
#if HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#if defined(__rtems__)
#define	flockfile(x)		(void) 0
#define	funlockfile(x)		(void) 0
#endif
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <stdint.h>
#include <inttypes.h>

#include <pwd.h>
#include <unistd.h>
#include <dirent.h>
#if HAVE_DLFCN_H
#include <dlfcn.h>
#endif
#include <pthread.h>
#define	SSL_LIB			"libssl.so"
#define	CRYPTO_LIB		"libcrypto.so"
#define	DIRSEP			'/'
#define	IS_DIRSEP_CHAR(c)	((c) == '/')
#define	O_BINARY		0
#define	closesocket(a)		close(a)
#define	mg_fopen(x, y)		fopen(x, y)
#define	mg_mkdir(x, y)		mkdir(x, y)
#define	mg_remove(x)		remove(x)
#define	mg_rename(x, y)		rename(x, y)
#define	ERRNO			errno
#define	INVALID_SOCKET		(-1)
#define INT64_FMT		PRId64
typedef int SOCKET;

#endif /* End of Windows and UNIX specific includes */

#include "mongoose.h"

#define	MONGOOSE_VERSION	"2.9"
#define	PASSWORDS_FILE_NAME	".htpasswd"
#define	CGI_ENVIRONMENT_SIZE	4096
#define	MAX_CGI_ENVIR_VARS	64
#define	MAX_REQUEST_SIZE	8192
#define	MAX_LISTENING_SOCKETS	10
#define	MAX_CALLBACKS		20
#define	ARRAY_SIZE(array)	(sizeof(array) / sizeof(array[0]))
#define	DEBUG_MGS_PREFIX	"*** Mongoose debug *** "

#if defined(DEBUG)
#define	DEBUG_TRACE(x) do {printf x; putchar('\n'); fflush(stdout);} while (0)
#else
#define DEBUG_TRACE(x)
#endif /* DEBUG */

/*
 * Darwin prior to 7.0 and Win32 do not have socklen_t
 */
#ifdef NO_SOCKLEN_T
typedef int socklen_t;
#endif /* NO_SOCKLEN_T */

#if !defined(FALSE)
enum {FALSE, TRUE};
#endif /* !FALSE */

typedef int bool_t;
typedef void * (*mg_thread_func_t)(void *);

static const char *http_500_error = "Internal Server Error";

/*
 * Snatched from OpenSSL includes. I put the prototypes here to be independent
 * from the OpenSSL source installation. Having this, mongoose + SSL can be
 * built on any system with binary SSL libraries installed.
 */
typedef struct ssl_st SSL;
typedef struct ssl_method_st SSL_METHOD;
typedef struct ssl_ctx_st SSL_CTX;

#define	SSL_ERROR_WANT_READ	2
#define	SSL_ERROR_WANT_WRITE	3
#define SSL_FILETYPE_PEM	1
#define	CRYPTO_LOCK		1

/*
 * Dynamically loaded SSL functionality
 */
struct ssl_func {
	const char	*name;		/* SSL function name	*/
	void		(*ptr)(void);	/* Function pointer	*/
};

#define	SSL_free(x)	(* (void (*)(SSL *)) ssl_sw[0].ptr)(x)
#define	SSL_accept(x)	(* (int (*)(SSL *)) ssl_sw[1].ptr)(x)
#define	SSL_connect(x)	(* (int (*)(SSL *)) ssl_sw[2].ptr)(x)
#define	SSL_read(x,y,z)	(* (int (*)(SSL *, void *, int)) 		\
				ssl_sw[3].ptr)((x),(y),(z))
#define	SSL_write(x,y,z) (* (int (*)(SSL *, const void *,int))		\
				ssl_sw[4].ptr)((x), (y), (z))
#define	SSL_get_error(x,y)(* (int (*)(SSL *, int)) ssl_sw[5])((x), (y))
#define	SSL_set_fd(x,y)	(* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)((x), (y))
#define	SSL_new(x)	(* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)(x)
#define	SSL_CTX_new(x)	(* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)(x)
#define	SSLv23_server_method()	(* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)()
#define	SSL_library_init() (* (int (*)(void)) ssl_sw[10].ptr)()
#define	SSL_CTX_use_PrivateKey_file(x,y,z)	(* (int (*)(SSL_CTX *, \
		const char *, int)) ssl_sw[11].ptr)((x), (y), (z))
#define	SSL_CTX_use_certificate_file(x,y,z)	(* (int (*)(SSL_CTX *, \
		const char *, int)) ssl_sw[12].ptr)((x), (y), (z))
#define SSL_CTX_set_default_passwd_cb(x,y) \
	(* (void (*)(SSL_CTX *, mg_spcb_t)) ssl_sw[13].ptr)((x),(y))
#define SSL_CTX_free(x) (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)(x)

#define CRYPTO_num_locks() (* (int (*)(void)) crypto_sw[0].ptr)()
#define CRYPTO_set_locking_callback(x)					\
		(* (void (*)(void (*)(int, int, const char *, int)))	\
	 	crypto_sw[1].ptr)(x)
#define CRYPTO_set_id_callback(x)					\
	(* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)(x)

/*
 * set_ssl_option() function when called, updates this array.
 * It loads SSL library dynamically and changes NULLs to the actual addresses
 * of respective functions. The macros above (like SSL_connect()) are really
 * just calling these functions indirectly via the pointer.
 */
static struct ssl_func	ssl_sw[] = {
	{"SSL_free",			NULL},
	{"SSL_accept",			NULL},
	{"SSL_connect",			NULL},
	{"SSL_read",			NULL},
	{"SSL_write",			NULL},
	{"SSL_get_error",		NULL},
	{"SSL_set_fd",			NULL},
	{"SSL_new",			NULL},
	{"SSL_CTX_new",			NULL},
	{"SSLv23_server_method",	NULL},
	{"SSL_library_init",		NULL},
	{"SSL_CTX_use_PrivateKey_file",	NULL},
	{"SSL_CTX_use_certificate_file",NULL},
	{"SSL_CTX_set_default_passwd_cb",NULL},
	{"SSL_CTX_free",		NULL},
	{NULL,				NULL}
};

#if !defined(NO_SSL)
/*
 * Similar array as ssl_sw. These functions are located in different lib.
 */
static struct ssl_func	crypto_sw[] = {
	{"CRYPTO_num_locks",		NULL},
	{"CRYPTO_set_locking_callback",	NULL},
	{"CRYPTO_set_id_callback",	NULL},
	{NULL,				NULL}
};
#endif

/*
 * Month names
 */
static const char *month_names[] = {
	"Jan", "Feb", "Mar", "Apr", "May", "Jun",
	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};

/*
 * Unified socket address. For IPv6 support, add IPv6 address structure
 * in the union u.
 */
struct usa {
	socklen_t len;
	union {
		struct sockaddr	sa;
		struct sockaddr_in sin;
	} u;
};

/*
 * Specifies a string (chunk of memory).
 * Used to traverse comma separated lists of options.
 */
struct vec {
	const char	*ptr;
	size_t		len;
};

/*
 * Structure used by mg_stat() function. Uses 64 bit file length.
 */
struct mgstat {
	bool_t		is_directory;	/* Directory marker		*/
	int64_t		size;		/* File size			*/
	time_t		mtime;		/* Modification time		*/
};

struct mg_option {
	const char	*name;
	const char	*description;
	const char	*default_value;
	int		index;
	bool_t (*setter)(struct mg_context *, const char *);
};

/*
 * Numeric indexes for the option values in context, ctx->options
 */
enum mg_option_index {
	OPT_ROOT, OPT_INDEX_FILES, OPT_PORTS, OPT_DIR_LIST, OPT_CGI_EXTENSIONS,
	OPT_CGI_INTERPRETER, OPT_CGI_ENV, OPT_SSI_EXTENSIONS, OPT_AUTH_DOMAIN,
	OPT_AUTH_GPASSWD, OPT_AUTH_PUT, OPT_ACCESS_LOG, OPT_ERROR_LOG,
	OPT_SSL_CERTIFICATE, OPT_ALIASES, OPT_ACL, OPT_UID, OPT_PROTECT,
	OPT_SERVICE, OPT_HIDE, OPT_ADMIN_URI, OPT_MAX_THREADS, OPT_IDLE_TIME,
	OPT_MIME_TYPES,
	NUM_OPTIONS
};

/*
 * Structure used to describe listening socket, or socket which was
 * accept()-ed by the master thread and queued for future handling
 * by the worker thread.
 */
struct socket {
	SOCKET		sock;		/* Listening socket		*/
	struct usa	lsa;		/* Local socket address		*/
	struct usa	rsa;		/* Remote socket address	*/
	bool_t		is_ssl;		/* Is socket SSL-ed		*/
};

/*
 * Callback function, and where it is bound to
 */
struct callback {
	char		*uri_regex;	/* URI regex to handle		*/
	mg_callback_t	func;		/* user callback		*/
	bool_t		is_auth;	/* func is auth checker		*/
	int		status_code;	/* error code to handle		*/
	void		*user_data;	/* opaque user data		*/
};

/*
 * Mongoose context
 */
struct mg_context {
	int		stop_flag;	/* Should we stop event loop	*/
	SSL_CTX		*ssl_ctx;	/* SSL context			*/

	FILE		*access_log;	/* Opened access log		*/
	FILE		*error_log;	/* Opened error log		*/

	struct socket	listeners[MAX_LISTENING_SOCKETS];
	int		num_listeners;

	struct callback	callbacks[MAX_CALLBACKS];
	int		num_callbacks;

	char		*options[NUM_OPTIONS];	/* Configured opions	*/
	pthread_mutex_t	opt_mutex[NUM_OPTIONS];	/* Option protector	*/

	int		max_threads;	/* Maximum number of threads	*/
	int		num_threads;	/* Number of threads		*/
	int		num_idle;	/* Number of idle threads	*/
	pthread_mutex_t	thr_mutex;	/* Protects (max|num)_threads	*/
	pthread_cond_t	thr_cond;
	pthread_mutex_t	bind_mutex;	/* Protects bind operations	*/

	struct socket	queue[20];	/* Accepted sockets		*/
	int		sq_head;	/* Head of the socket queue	*/
	int		sq_tail;	/* Tail of the socket queue	*/
	pthread_cond_t	empty_cond;	/* Socket queue empty condvar	*/
	pthread_cond_t	full_cond;	/* Socket queue full condvar	*/

	mg_spcb_t	ssl_password_callback;
	mg_callback_t	log_callback;
};

/*
 * Client connection.
 */
struct mg_connection {
	struct mg_request_info	request_info;
	struct mg_context *ctx;		/* Mongoose context we belong to*/
	SSL		*ssl;		/* SSL descriptor		*/
	struct socket	client;		/* Connected client		*/
	time_t		birth_time;	/* Time connection was accepted	*/
	bool_t		free_post_data;	/* post_data was malloc-ed	*/
	bool_t		embedded_auth;	/* Used for authorization	*/
	int64_t		num_bytes_sent;	/* Total bytes sent to client	*/
};

/*
 * Print error message to the opened error log stream.
 */
static void
cry(struct mg_connection *conn, const char *fmt, ...)
{
	char	buf[BUFSIZ];
	va_list	ap;

	va_start(ap, fmt);
	(void) vsnprintf(buf, sizeof(buf), fmt, ap);
	conn->ctx->log_callback(conn, &conn->request_info, buf);
	va_end(ap);
}

/*
 * Return fake connection structure. Used for logging, if connection
 * is not applicable at the moment of logging.
 */
static struct mg_connection *
fc(struct mg_context *ctx)
{
	static struct mg_connection fake_connection;
	fake_connection.ctx = ctx;
	return (&fake_connection);
}

/*
 * If an embedded code does not intercept logging by calling
 * mg_set_log_callback(), this function is used for logging. It prints
 * stuff to the conn->error_log, which is stderr unless "error_log"
 * option was set.
 */
static void
builtin_error_log(struct mg_connection *conn,
		const struct mg_request_info *request_info, void *message)
{
	FILE	*fp;
	time_t	timestamp;

	fp = conn->ctx->error_log;
	flockfile(fp);

	timestamp = time(NULL);

	(void) fprintf(fp,
	    "[%010lu] [error] [client %s] ",
	    (unsigned long) timestamp,
	    inet_ntoa(conn->client.rsa.u.sin.sin_addr));

	if (request_info->request_method != NULL)
		(void) fprintf(fp, "%s %s: ",
		    request_info->request_method,
		    request_info->uri);

	(void) fprintf(fp, "%s", (char *) message);

	fputc('\n', fp);

	funlockfile(fp);
}

const char *
mg_version(void)
{
	return (MONGOOSE_VERSION);
}

static void
mg_strlcpy(register char *dst, register const char *src, size_t n)
{
	for (; *src != '\0' && n > 1; n--)
		*dst++ = *src++;
	*dst = '\0';
}

static int
lowercase(const char *s)
{
	return (tolower(* (unsigned char *) s));
}

static int
mg_strncasecmp(const char *s1, const char *s2, size_t len)
{
	int	diff = 0;

	if (len > 0)
		do {
			diff = lowercase(s1++) - lowercase(s2++);
		} while (diff == 0 && s1[-1] != '\0' && --len > 0);

	return (diff);
}

static int
mg_strcasecmp(const char *s1, const char *s2)
{
	int	diff;

	do {
		diff = lowercase(s1++) - lowercase(s2++);
	} while (diff == 0 && s1[-1] != '\0');

	return (diff);
}

static char *
mg_strndup(const char *ptr, size_t len)
{
	char	*p;

	if ((p = (char *) malloc(len + 1)) != NULL)
		mg_strlcpy(p, ptr, len + 1);

	return (p);

}

static char *
mg_strdup(const char *str)
{
	return (mg_strndup(str, strlen(str)));
}

/*
 * Like snprintf(), but never returns negative value, or the value
 * that is larger than a supplied buffer.
 * Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
 * in his audit report.
 */
static int
mg_vsnprintf(struct mg_connection *conn,
		char *buf, size_t buflen, const char *fmt, va_list ap)
{
	int	n;

	if (buflen == 0)
		return (0);

	n = vsnprintf(buf, buflen, fmt, ap);

	if (n < 0) {
		cry(conn, "vsnprintf error");
		n = 0;
	} else if (n >= (int) buflen) {
		cry(conn, "truncating vsnprintf buffer: [%.*s]",
		    n > 200 ? 200 : n, buf);
		n = (int) buflen - 1;
	}
	buf[n] = '\0';

	return (n);
}

static int
mg_snprintf(struct mg_connection *conn,
		char *buf, size_t buflen, const char *fmt, ...)
{
	va_list	ap;
	int	n;

	va_start(ap, fmt);
	n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
	va_end(ap);

	return (n);
}

/*
 * Convert string representing a boolean value to a boolean value
 */
static bool_t
is_true(const char *str)
{
	static const char	*trues[] = {"1", "yes", "true", "ja", NULL};
	int			i;

	for (i = 0; trues[i] != NULL; i++)
		if (str != NULL && mg_strcasecmp(str, trues[i]) == 0)
			return (TRUE);

	return (FALSE);
}

/*
 * Skip the characters until one of the delimiters characters found.
 * 0-terminate resulting word. Skip the rest of the delimiters if any.
 * Advance pointer to buffer to the next word. Return found 0-terminated word.
 */
static char *
skip(char **buf, const char *delimiters)
{
	char	*p, *begin_word, *end_word, *end_delimiters;

	begin_word = *buf;
	end_word = begin_word + strcspn(begin_word, delimiters);
	end_delimiters = end_word + strspn(end_word, delimiters);

	for (p = end_word; p < end_delimiters; p++)
		*p = '\0';

	*buf = end_delimiters;

	return (begin_word);
}

/*
 * Return HTTP header value, or NULL if not found.
 */
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));
}

/*
 * A helper function for traversing comma separated list of values.
 * It returns a list pointer shifted to the next value, of NULL if the end
 * of the list found.
 * Value is stored in val vector. If value has form "x=y", then eq_val
 * vector is initialized to point to the "y" part, and val vector length
 * is adjusted to point only to "x".
 */
static const char *
next_option(const char *list, struct vec *val, struct vec *eq_val)
{
	if (list == NULL || *list == '\0') {
		/* End of the list */
		list = NULL;
	} else {
		val->ptr = list;
		if ((list = strchr(val->ptr, ',')) != NULL) {
			/* Comma found. Store length and shift the list ptr */
			val->len = list - val->ptr;
			list++;
		} else {
			/* This value is the last one */
			list = val->ptr + strlen(val->ptr);
			val->len = list - val->ptr;
		}

		if (eq_val != NULL) {
			/*
			 * Value has form "x=y", adjust pointers and lengths
			 * so that val points to "x", and eq_val points to "y".
			 */
			eq_val->len = 0;
			eq_val->ptr = memchr(val->ptr, '=', val->len);
			if (eq_val->ptr != NULL) {
				eq_val->ptr++;  /* Skip over '=' character */
				eq_val->len = val->ptr + val->len - eq_val->ptr;
				val->len = (eq_val->ptr - val->ptr) - 1;
			}
		}
	}

	return (list);
}

#if !(defined(NO_CGI) && defined(NO_SSI))
/*
 * Verify that given file has certain extension
 */
static bool_t
match_extension(const char *path, const char *ext_list)
{
	struct vec	ext_vec;
	size_t		path_len;

	path_len = strlen(path);

	while ((ext_list = next_option(ext_list, &ext_vec, NULL)) != NULL)
		if (ext_vec.len < path_len &&
		    mg_strncasecmp(path + path_len - ext_vec.len,
			    ext_vec.ptr, ext_vec.len) == 0)
			return (TRUE);

	return (FALSE);
}
#endif /* !(NO_CGI && NO_SSI) */

/*
 * Return TRUE if "uri" matches "regexp".
 * '*' in the regexp means zero or more characters.
 */
static bool_t
match_regex(const char *uri, const char *regexp)
{
	if (*regexp == '\0')
		return (*uri == '\0');

	if (*regexp == '*')
		do {
			if (match_regex(uri, regexp + 1))
				return (TRUE);
		} while (*uri++ != '\0');

	if (*uri != '\0' && *regexp == *uri)
		return (match_regex(uri + 1, regexp + 1));

	return (FALSE);
}

static const struct callback *
find_callback(struct mg_context *ctx, bool_t is_auth,
		const char *uri, int status_code)
{
	const struct callback	*cb, *found;
	int			i;

	found = NULL;
	pthread_mutex_lock(&ctx->bind_mutex);
	for (i = 0; i < ctx->num_callbacks; i++) {
		cb = ctx->callbacks + i;
		if ((uri != NULL && cb->uri_regex != NULL &&
		    ((is_auth && cb->is_auth) || (!is_auth && !cb->is_auth)) &&
		    match_regex(uri, cb->uri_regex)) || (uri == NULL &&
		     (cb->status_code == 0 ||
		      cb->status_code == status_code))) {
			found = cb;
			break;
		}
	}
	pthread_mutex_unlock(&ctx->bind_mutex);

	return (found);
}

/*
 * For use by external application. This sets custom logging function.
 */
void
mg_set_log_callback(struct mg_context *ctx, mg_callback_t log_callback)
{
	/* If NULL is specified as a callback, revert back to the default */
	if (log_callback == NULL)
		ctx->log_callback = &builtin_error_log;
	else
		ctx->log_callback = log_callback;
}

/*
 * Send error message back to the client.
 */
static void
send_error(struct mg_connection *conn, int status, const char *reason,
		const char *fmt, ...)
{
	const struct callback	*cb;
	char		buf[BUFSIZ];
	va_list		ap;
	int		len;

	conn->request_info.status_code = status;

	/* If error handler is set, call it. Otherwise, send error message */
	if ((cb = find_callback(conn->ctx, FALSE, NULL, status)) != NULL) {
		cb->func(conn, &conn->request_info, cb->user_data);
	} else {
		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\n", status, reason);
			cry(conn, "%s", buf);

			va_start(ap, fmt);
			len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len,
			    fmt, ap);
			va_end(ap);
			conn->num_bytes_sent = len;
		}

		(void) mg_printf(conn,
		    "HTTP/1.1 %d %s\r\n"
		    "Content-Type: text/plain\r\n"
		    "Content-Length: %d\r\n"
		    "Connection: close\r\n"
		    "\r\n%s", status, reason, len, buf);
	}
}

#ifdef _WIN32
static int
pthread_mutex_init(pthread_mutex_t *mutex, void *unused)
{
	unused = NULL;
	*mutex = CreateMutex(NULL, FALSE, NULL);
	return (*mutex == NULL ? -1 : 0);
}

static int
pthread_mutex_destroy(pthread_mutex_t *mutex)
{
	return (CloseHandle(*mutex) == 0 ? -1 : 0);
}

static int
pthread_mutex_lock(pthread_mutex_t *mutex)
{
	return (WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1);
}

static int
pthread_mutex_unlock(pthread_mutex_t *mutex)
{
	return (ReleaseMutex(*mutex) == 0 ? -1 : 0);
}

static int
pthread_cond_init(pthread_cond_t *cv, const void *unused)
{
	unused = NULL;
	*cv = CreateEvent(NULL, FALSE, FALSE, NULL);
	return (*cv == NULL ? -1 : 0);
}

static int
pthread_cond_timedwait(pthread_cond_t *cv, pthread_mutex_t *mutex,
	const struct timespec *ts)
{
	DWORD	status;
	DWORD	msec = INFINITE;
	time_t	now;
	
	if (ts != NULL) {
		now = time(NULL);
		msec = 1000 * (now > ts->tv_sec ? 0 : ts->tv_sec - now);
	}

	(void) ReleaseMutex(*mutex);
	status = WaitForSingleObject(*cv, msec);
	(void) WaitForSingleObject(*mutex, INFINITE);
	
	return (status == WAIT_OBJECT_0 ? 0 : -1);
}

static int
pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex)
{
	return (pthread_cond_timedwait(cv, mutex, NULL));
}

static int
pthread_cond_signal(pthread_cond_t *cv)
{
	return (SetEvent(*cv) == 0 ? -1 : 0);
}

static int
pthread_cond_destroy(pthread_cond_t *cv)
{
	return (CloseHandle(*cv) == 0 ? -1 : 0);
}

static pthread_t
pthread_self(void)
{
	return (GetCurrentThreadId());
}

/*
 * Change all slashes to backslashes. It is Windows.
 */
static void
fix_directory_separators(char *path)
{
	int	i;

	for (i = 0; path[i] != '\0'; i++) {
		if (path[i] == '/')
			path[i] = '\\';
		/* i > 0 check is to preserve UNC paths, \\server\file.txt */
		if (path[i] == '\\' && i > 0)
			while (path[i + 1] == '\\' || path[i + 1] == '/')
				(void) memmove(path + i + 1,
				    path + i + 2, strlen(path + i + 1));
	}
}

/*
 * Encode 'path' which is assumed UTF-8 string, into UNICODE string.
 * wbuf and wbuf_len is a target buffer and its length.
 */
static void
to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len)
{
	char	buf[FILENAME_MAX], *p;

	mg_strlcpy(buf, path, sizeof(buf));
	fix_directory_separators(buf);

	/* Point p to the end of the file name */
	p = buf + strlen(buf) - 1;

	/* Trim trailing backslash character */
	while (p > buf && *p == '\\' && p[-1] != ':')
		*p-- = '\0';

	/*
	 * Protect from CGI code disclosure.
	 * This is very nasty hole. Windows happily opens files with
	 * some garbage in the end of file name. So fopen("a.cgi    ", "r")
	 * actually opens "a.cgi", and does not return an error!
	 */
	if (*p == 0x20 ||               /* No space at the end */
	    (*p == 0x2e && p > buf) ||  /* No '.' but allow '.' as full path */
	    *p == 0x2b ||               /* No '+' */
	    (*p & ~0x7f)) {             /* And generally no non-ascii chars */
		(void) fprintf(stderr, "Rejecting suspicious path: [%s]", buf);
		buf[0] = '\0';
	}

	(void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
}

#if defined(_WIN32_WCE)

static time_t
time(time_t *ptime)
{
	time_t		t;
	SYSTEMTIME	st;
	FILETIME	ft;

	GetSystemTime(&st);
	SystemTimeToFileTime(&st, &ft);
	t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);

	if (ptime != NULL)
		*ptime = t;

	return (t);
}

static time_t
mktime(struct tm *ptm)
{
	SYSTEMTIME	st;
	FILETIME	ft, lft;

	st.wYear = ptm->tm_year + 1900;
	st.wMonth = ptm->tm_mon + 1;
	st.wDay = ptm->tm_mday;
	st.wHour = ptm->tm_hour;
	st.wMinute = ptm->tm_min;
	st.wSecond = ptm->tm_sec;
	st.wMilliseconds = 0;

	SystemTimeToFileTime(&st, &ft);
	LocalFileTimeToFileTime(&ft, &lft);
	return (time_t)((MAKEUQUAD(lft.dwLowDateTime, lft.dwHighDateTime) -
	    EPOCH_DIFF) / RATE_DIFF);
}

static struct tm *
localtime(const time_t *ptime, struct tm *ptm)
{
	int64_t	t = ((int64_t)*ptime) * RATE_DIFF + EPOCH_DIFF;
	FILETIME	ft, lft;
	SYSTEMTIME	st;
	TIME_ZONE_INFORMATION	tzinfo;

	if (ptm == NULL)
		return NULL;

	* (int64_t *) &ft = t;
	FileTimeToLocalFileTime(&ft, &lft);
	FileTimeToSystemTime(&lft, &st);
	ptm->tm_year = st.wYear - 1900;
	ptm->tm_mon = st.wMonth - 1;
	ptm->tm_wday = st.wDayOfWeek;
	ptm->tm_mday = st.wDay;
	ptm->tm_hour = st.wHour;
	ptm->tm_min = st.wMinute;
	ptm->tm_sec = st.wSecond;
	ptm->tm_yday = 0; // hope nobody uses this
	ptm->tm_isdst = ((GetTimeZoneInformation(&tzinfo) ==
	    TIME_ZONE_ID_DAYLIGHT) ? 1 : 0);

	return ptm;
}

static size_t
strftime(char *dst, size_t dst_size, const char *fmt, const struct tm *tm)
{
	(void) snprintf(dst, dst_size, "implement strftime() for WinCE");
	return (0);
}	
#endif

static int
mg_rename(const char* oldname, const char* newname)
{
	wchar_t	woldbuf[FILENAME_MAX];
	wchar_t	wnewbuf[FILENAME_MAX];

	to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf));
	to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf));

	return (MoveFileW(woldbuf, wnewbuf) ? 0 : -1);
}


static FILE *
mg_fopen(const char *path, const char *mode)
{
	wchar_t	wbuf[FILENAME_MAX], wmode[20];

	to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
	MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));

	return (_wfopen(wbuf, wmode));
}

static int
mg_stat(const char *path, struct mgstat *stp)
{
	int				ok = -1; /* Error */
	wchar_t				wbuf[FILENAME_MAX];
	WIN32_FILE_ATTRIBUTE_DATA	info;

	to_unicode(path, wbuf, ARRAY_SIZE(wbuf));

	if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
		stp->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
		stp->mtime = SYS2UNIX_TIME(info.ftLastWriteTime.dwLowDateTime,
		    info.ftLastWriteTime.dwHighDateTime);
		stp->is_directory =
		    info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
		ok = 0;  /* Success */
	}

	return (ok);
}

static int
mg_remove(const char *path)
{
	wchar_t	wbuf[FILENAME_MAX];

	to_unicode(path, wbuf, ARRAY_SIZE(wbuf));

	return (DeleteFileW(wbuf) ? 0 : -1);
}

static int
mg_mkdir(const char *path, int mode)
{
	char	buf[FILENAME_MAX];
	wchar_t	wbuf[FILENAME_MAX];

	mode = 0; /* Unused */
	mg_strlcpy(buf, path, sizeof(buf));
	fix_directory_separators(buf);

	(void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, sizeof(wbuf));

	return (CreateDirectoryW(wbuf, NULL) ? 0 : -1);
}

/*
 * Implementation of POSIX opendir/closedir/readdir for Windows.
 */
static DIR *
opendir(const char *name)
{
	DIR	*dir = NULL;
	wchar_t	wpath[FILENAME_MAX];
	DWORD attrs;

	if (name == NULL) {
		SetLastError(ERROR_BAD_ARGUMENTS);
	} else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
		SetLastError(ERROR_NOT_ENOUGH_MEMORY);
	} else {
		to_unicode(name, wpath, ARRAY_SIZE(wpath));
		attrs = GetFileAttributesW(wpath);
		if (attrs != 0xFFFFFFFF &&
		    ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
			(void) wcscat(wpath, L"\\*");
			dir->handle = FindFirstFileW(wpath, &dir->info);
			dir->result.d_name[0] = '\0';
		} else {
			free(dir);
			dir = NULL;
		}
	}

	return (dir);
}

static int
closedir(DIR *dir)
{
	int result = 0;

	if (dir != NULL) {
		if (dir->handle != INVALID_HANDLE_VALUE)
			result = FindClose(dir->handle) ? 0 : -1;

		free(dir);
	} else {
		result = -1;
		SetLastError(ERROR_BAD_ARGUMENTS);
	}

	return (result);
}

struct dirent *
readdir(DIR *dir)
{
	struct dirent *result = 0;

	if (dir) {
		if (dir->handle != INVALID_HANDLE_VALUE) {
			result = &dir->result;
			(void) WideCharToMultiByte(CP_UTF8, 0,
			    dir->info.cFileName, -1, result->d_name,
			    sizeof(result->d_name), NULL, NULL);

			if (!FindNextFileW(dir->handle, &dir->info)) {
				(void) FindClose(dir->handle);
				dir->handle = INVALID_HANDLE_VALUE;
			}

		} else {
			SetLastError(ERROR_FILE_NOT_FOUND);
		}
	} else {
		SetLastError(ERROR_BAD_ARGUMENTS);
	}

	return (result);
}

#define	set_close_on_exec(fd)	/* No FD_CLOEXEC on Windows */

static int
start_thread(struct mg_context *ctx, mg_thread_func_t func, void *param)
{
	HANDLE	hThread;

	ctx = NULL;	/* Unused */
	
	hThread = CreateThread(NULL, 0,
	    (LPTHREAD_START_ROUTINE) func, param, 0, NULL);

	if (hThread != NULL)
		(void) CloseHandle(hThread);

	return (hThread == NULL ? -1 : 0);
}

static HANDLE
dlopen(const char *dll_name, int flags)
{
	wchar_t	wbuf[FILENAME_MAX];

	flags = 0; /* Unused */
	to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));

	return (LoadLibraryW(wbuf));
}

#if !defined(NO_CGI)
static int
kill(pid_t pid, int sig_num)
{
	(void) TerminateProcess(pid, sig_num);
	(void) CloseHandle(pid);
	return (0);
}

static pid_t
spawn_process(struct mg_connection *conn, const char *prog, char *envblk,
		char *envp[], int fd_stdin, int fd_stdout, const char *dir)
{
	HANDLE	me;
	char	*p, *interp, cmdline[FILENAME_MAX], line[FILENAME_MAX];
	FILE	*fp;
	STARTUPINFOA		si;
	PROCESS_INFORMATION	pi;

	envp = NULL; /* Unused */

	(void) memset(&si, 0, sizeof(si));
	(void) memset(&pi, 0, sizeof(pi));

	/* XXX redirect CGI errors to the error log file */
	si.cb		= sizeof(si);
	si.dwFlags	= STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
	si.wShowWindow	= SW_HIDE;

	me = GetCurrentProcess();
	(void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me,
	    &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
	(void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me,
	    &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);

	/* If CGI file is a script, try to read the interpreter line */
	interp = conn->ctx->options[OPT_CGI_INTERPRETER];
	if (interp == NULL) {
		line[2] = '\0';
		(void) mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%c%s",
		    dir, DIRSEP, prog);
		if ((fp = fopen(cmdline, "r")) != NULL) {
			(void) fgets(line, sizeof(line), fp);
			if (memcmp(line, "#!", 2) != 0)
				line[2] = '\0';
			/* Trim whitespaces from interpreter name */
			for (p = &line[strlen(line) - 1]; p > line &&
			    isspace(*p); p--)
				*p = '\0';
			(void) fclose(fp);
		}
		interp = line + 2;
	}

	if ((p = (char *) strrchr(prog, '/')) != NULL)
		prog = p + 1;

	(void) mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s",
	    interp, interp[0] == '\0' ? "" : " ", prog);

	(void) mg_snprintf(conn, line, sizeof(line), "%s", dir);
	fix_directory_separators(line);

	DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: Running [%s]", __func__, cmdline));
	if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
	    CREATE_NEW_PROCESS_GROUP, envblk, line, &si, &pi) == 0) {
		cry(conn, "%s: CreateProcess(%s): %d",
		    __func__, cmdline, ERRNO);
		pi.hProcess = (pid_t) -1;
	} else {
		(void) close(fd_stdin);
		(void) close(fd_stdout);
	}

	(void) CloseHandle(si.hStdOutput);
	(void) CloseHandle(si.hStdInput);
	(void) CloseHandle(pi.hThread);

	return ((pid_t) pi.hProcess);
}

static int
pipe(int *fds)
{
	return (_pipe(fds, BUFSIZ, _O_BINARY));
}
#endif /* !NO_CGI */

static int
set_non_blocking_mode(struct mg_connection *conn, SOCKET sock)
{
	unsigned long	on = 1;

	conn = NULL; /* unused */
	return (ioctlsocket(sock, FIONBIO, &on));
}

#else

static int
mg_stat(const char *path, struct mgstat *stp)
{
	struct stat	st;
	int		ok;

	if (stat(path, &st) == 0) {
		ok = 0;
		stp->size = st.st_size;
		stp->mtime = st.st_mtime;
		stp->is_directory = S_ISDIR(st.st_mode);
	} else {
		ok = -1;
	}

	return (ok);
}

static void
set_close_on_exec(int fd)
{
	(void) fcntl(fd, F_SETFD, FD_CLOEXEC);
}

static int
start_thread(struct mg_context *ctx, mg_thread_func_t func, void *param)
{
	pthread_t	thread_id;
	pthread_attr_t	attr;
	int		retval;

	(void) pthread_attr_init(&attr);
	(void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);

	if ((retval = pthread_create(&thread_id, &attr, func, param)) != 0)
		cry(fc(ctx), "%s: %s", __func__, strerror(retval));

	return (retval);
}

#ifndef NO_CGI
static pid_t
spawn_process(struct mg_connection *conn, const char *prog, char *envblk,
		char *envp[], int fd_stdin, int fd_stdout, const char *dir)
{
	pid_t		pid;
	const char	*interp;

	envblk = NULL;	/* unused */

	if ((pid = fork()) == -1) {
		/* Parent */
		send_error(conn, 500, http_500_error,
		    "fork(): %s", strerror(ERRNO));
	} else if (pid == 0) {
		/* Child */
		if (chdir(dir) != 0) {
			cry(conn, "%s: chdir(%s): %s",
			    __func__, dir, strerror(ERRNO));
		} else if (dup2(fd_stdin, 0) == -1) {
			cry(conn, "%s: dup2(stdin, %d): %s",
			    __func__, fd_stdin, strerror(ERRNO));
		} else if (dup2(fd_stdout, 1) == -1) {
			cry(conn, "%s: dup2(stdout, %d): %s",
			    __func__, fd_stdout, strerror(ERRNO));
		} else {
			/* If error file is specified, send errors there */
			if (conn->ctx->error_log != NULL)
				(void) dup2(fileno(conn->ctx->error_log), 2);

			(void) close(fd_stdin);
			(void) close(fd_stdout);

			/* Execute CGI program */
			interp = conn->ctx->options[OPT_CGI_INTERPRETER];
			if (interp == NULL) {
				(void) execle(prog, prog, NULL, envp);
				cry(conn, "%s: execle(%s): %s",
				    __func__, prog, strerror(ERRNO));
			} else {
				(void) execle(interp, interp, prog, NULL, envp);
				cry(conn, "%s: execle(%s %s): %s",
				    __func__, interp, prog, strerror(ERRNO));
			}
		}
		exit(EXIT_FAILURE);
	} else {
		/* Parent. Close stdio descriptors */
		(void) close(fd_stdin);
		(void) close(fd_stdout);
	}

	return (pid);
}
#endif /* !NO_CGI */

static int
set_non_blocking_mode(struct mg_connection *conn, SOCKET sock)
{
	int	flags, ok = -1;

	if ((flags = fcntl(sock, F_GETFL, 0)) == -1) {
		cry(conn, "%s: fcntl(F_GETFL): %d", __func__, ERRNO);
	} else if (fcntl(sock, F_SETFL, flags | O_NONBLOCK) != 0) {
		cry(conn, "%s: fcntl(F_SETFL): %d", __func__, ERRNO);
	} else {
		ok = 0;	/* Success */
	}

	return (ok);
}
#endif /* _WIN32 */

static void
lock_option(struct mg_context *ctx, int opt_index)
{
	if (pthread_mutex_lock(&ctx->opt_mutex[opt_index]) != 0)
		cry(fc(ctx), "pthread_mutex_lock: %s", strerror(ERRNO));
}

static void
unlock_option(struct mg_context *ctx, int opt_index)
{
	if (pthread_mutex_unlock(&ctx->opt_mutex[opt_index]) != 0)
		cry(fc(ctx), "pthread_mutex_unlock: %s", strerror(ERRNO));
}

/*
 * 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 = fwrite(buf + sent, 1, k, fp);
			if (ferror(fp))
				n = -1;
		} else {
			n = send(sock, buf + sent, k, 0);
		}

		if (n < 0)
			break;

		sent += n;
	}

	return (sent);
}

/*
 * Read from IO channel - opened file descriptor, socket, or SSL descriptor.
 * Return number of bytes read.
 */
static int
pull(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int len)
{
	int	nread;

	if (ssl != NULL) {
		nread = SSL_read(ssl, buf, len);
	} else if (fp != NULL) {
		nread = fread(buf, 1, (size_t) len, fp);
		if (ferror(fp))
			nread = -1;
	} else {
		nread = recv(sock, buf, (size_t) len, 0);
	}

	return (nread);
}

int
mg_write(struct mg_connection *conn, const void *buf, int len)
{
	assert(len >= 0);
	return ((int) push(NULL, conn->client.sock, conn->ssl,
				(const char *) buf, (int64_t) len));
}

int
mg_printf(struct mg_connection *conn, const char *fmt, ...)
{
	char	buf[MAX_REQUEST_SIZE];
	int	len;
	va_list	ap;

	va_start(ap, fmt);
	len = mg_vsnprintf(conn, buf, sizeof(buf), fmt, ap);
	va_end(ap);

	return (mg_write(conn, buf, len));
}

/*
 * Return content length of the request, or -1 constant if
 * Content-Length header is not set.
 */
static int64_t
get_content_length(const struct mg_connection *conn)
{
	const char *cl = mg_get_header(conn, "Content-Length");
	return (cl == NULL ? -1 : strtoll(cl, NULL, 10));
}

/*
 * URL-decode input buffer into destination buffer.
 * 0-terminate the destination buffer. Return the length of decoded data.
 * form-url-encoded data differs from URI encoding in a way that it
 * uses '+' as character for space, see RFC 1866 section 8.2.1
 * http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt
 */
static size_t
url_decode(const char *src, size_t src_len, char *dst, size_t dst_len,
		bool_t is_form_url_encoded)
{
	size_t	i, j;
	int	a, b;
#define	HEXTOI(x)	(isdigit(x) ? x - '0' : x - 'W')

	for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
		if (src[i] == '%' &&
		    isxdigit(* (unsigned char *) (src + i + 1)) &&
		    isxdigit(* (unsigned char *) (src + i + 2))) {
			a = tolower(* (unsigned char *) (src + i + 1));
			b = tolower(* (unsigned char *) (src + i + 2));
			dst[j] = ((HEXTOI(a) << 4) | HEXTOI(b)) & 0xff;
			i += 2;
		} else if (is_form_url_encoded && src[i] == '+') {
			dst[j] = ' ';
		} else {
			dst[j] = src[i];
		}
	}

	dst[j] = '\0';	/* Null-terminate the destination */

	return (j);
}

/*
 * Search for a form variable in a given buffer.
 * Semantic is the same as for mg_get_var().
 */
static char *
get_var(const char *name, const char *buf, size_t buf_len)
{
	const char	*p, *e, *s;
	char		*val;
	size_t		var_len, len;

	var_len = strlen(name);
	e = buf + buf_len;
	val = NULL;

	/* buf is "var1=val1&var2=val2...". Find variable first */
	for (p = buf; p + var_len < e; p++)
		if ((p == buf || p[-1] == '&') && p[var_len] == '=' &&
		    !mg_strncasecmp(name, p, var_len)) {

			/* Point p to variable value */
			p += var_len + 1;

			/* Point s to the end of the value */
			s = (const char *) memchr(p, '&', e - p);
			if (s == NULL)
				s = e;

			/* Try to allocate the buffer */
			len = s - p;
			if ((val = (char *) malloc(len + 1)) != NULL)
				(void) url_decode(p, len, val, len + 1, TRUE);
			break;
		}

	return (val);
}

/*
 * Free the pointer returned by mg_get_var(). This is needed for languages
 * like python, to have an ability to free allocated data without
 * loading C runtime library and calling free().
 */
void
mg_free(char *data)
{
	free(data);
}

/*
 * Return form data variable.
 * It can be specified in query string, or in the POST data.
 * Return NULL if the variable not found, or allocated 0-terminated value.
 * It is caller's responsibility to free the returned value.
 */
char *
mg_get_var(const struct mg_connection *conn, const char *name)
{
	const struct mg_request_info	*ri = &conn->request_info;
	char				*v1, *v2;

	v1 = v2 = NULL;

	/* Look in both query_string and POST data */
	if (ri->query_string != NULL)
		v1 = get_var(name, ri->query_string, strlen(ri->query_string));
	if (ri->post_data_len > 0)
		v2 = get_var(name, ri->post_data, ri->post_data_len);

	/* If they both have queried variable, POST data wins */
	if (v1 != NULL && v2 != NULL)
		free(v1);

	return (v2 == NULL ? v1 : v2);
}

/*
 * Transform URI to the file name.
 */
static void
convert_uri_to_file_name(struct mg_connection *conn, const char *uri,
		char *buf, size_t buf_len)
{
	struct mg_context	*ctx = conn->ctx;
	struct vec		uri_vec, path_vec;
	const char		*list;

	lock_option(ctx, OPT_ROOT);
	mg_snprintf(conn, buf, buf_len, "%s%s", ctx->options[OPT_ROOT], uri);
	unlock_option(ctx, OPT_ROOT);

	/* If requested URI has aliased prefix, use alternate root */
	lock_option(ctx, OPT_ALIASES);
	list = ctx->options[OPT_ALIASES];

	while ((list = next_option(list, &uri_vec, &path_vec)) != NULL) {
		if (memcmp(uri, uri_vec.ptr, uri_vec.len) == 0) {
			(void) mg_snprintf(conn, buf, buf_len, "%.*s%s",
			    path_vec.len, path_vec.ptr, uri + uri_vec.len);
			break;
		}
	}
	unlock_option(ctx, OPT_ALIASES);

#ifdef _WIN32
	fix_directory_separators(buf);
#endif /* _WIN32 */

	DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: [%s] -> [%s]", __func__, uri, buf));
}

/*
 * Setup listening socket on given address, return socket.
 * Address format: [local_ip_address:]port_number
 */
static SOCKET
mg_open_listening_port(struct mg_context *ctx, const char *str, struct usa *usa)
{
	SOCKET		sock;
	int		on = 1, a, b, c, d, port;

	/* MacOS needs that. If we do not zero it, bind() will fail. */
	(void) memset(usa, 0, sizeof(*usa));

	if (sscanf(str, "%d.%d.%d.%d:%d", &a, &b, &c, &d, &port) == 5) {
		/* IP address to bind to is specified */
		usa->u.sin.sin_addr.s_addr =
		    htonl(((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | (uint32_t)d);
	} else if (sscanf(str, "%d", &port) == 1) {
		/* Only port number is specified. Bind to all addresses */
		usa->u.sin.sin_addr.s_addr = htonl(INADDR_ANY);
	} else {
		return (INVALID_SOCKET);
	}

	usa->len			= sizeof(usa->u.sin);
	usa->u.sin.sin_family		= AF_INET;
	usa->u.sin.sin_port		= htons((uint16_t) port);

	if ((sock = socket(PF_INET, SOCK_STREAM, 6)) != INVALID_SOCKET &&
	    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
	    (char *) &on, sizeof(on)) == 0 &&
	    bind(sock, &usa->u.sa, usa->len) == 0 &&
	    listen(sock, 20) == 0) {
		/* Success */
		set_close_on_exec(sock);
	} else {
		/* Error */
		cry(fc(ctx), "%s(%d): %s", __func__, port, strerror(ERRNO));
		if (sock != INVALID_SOCKET)
			(void) closesocket(sock);
		sock = INVALID_SOCKET;
	}

	return (sock);
}

/*
 * Check whether full request is buffered. Return:
 *   -1         if request is malformed
 *    0         if request is not yet fully buffered
 *   >0         actual request length, including last \r\n\r\n
 */
static int
get_request_len(const char *buf, size_t buflen)
{
	const char	*s, *e;
	int		len = 0;

	for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
		/* Control characters are not allowed but >=128 is. */
		if (!isprint(* (unsigned char *) s) && *s != '\r' &&
		    *s != '\n' && * (unsigned char *) s < 128)
			len = -1;
		else if (s[0] == '\n' && s[1] == '\n')
			len = (int) (s - buf) + 2;
		else if (s[0] == '\n' && &s[1] < e &&
		    s[1] == '\r' && s[2] == '\n')
			len = (int) (s - buf) + 3;

	return (len);
}

/*
 * Convert month to the month number. Return -1 on error, or month number
 */
static int
montoi(const char *s)
{
	size_t	i;

	for (i = 0; i < sizeof(month_names) / sizeof(month_names[0]); i++)
		if (!strcmp(s, month_names[i]))
			return ((int) i);

	return (-1);
}

/*
 * Parse date-time string, and return the corresponding time_t value
 */
static time_t
date_to_epoch(const char *s)
{
	time_t		current_time;
	struct tm	tm, *tmp;
	char		mon[32];
	int		sec, min, hour, mday, month, year;

	(void) memset(&tm, 0, sizeof(tm));
	sec = min = hour = mday = month = year = 0;

	if (((sscanf(s, "%d/%3s/%d %d:%d:%d",
	    &mday, mon, &year, &hour, &min, &sec) == 6) ||
	    (sscanf(s, "%d %3s %d %d:%d:%d",
	    &mday, mon, &year, &hour, &min, &sec) == 6) ||
	    (sscanf(s, "%*3s, %d %3s %d %d:%d:%d",
	    &mday, mon, &year, &hour, &min, &sec) == 6) ||
	    (sscanf(s, "%d-%3s-%d %d:%d:%d",
	    &mday, mon, &year, &hour, &min, &sec) == 6)) &&
	    (month = montoi(mon)) != -1) {
		tm.tm_mday	= mday;
		tm.tm_mon	= month;
		tm.tm_year	= year;
		tm.tm_hour	= hour;
		tm.tm_min	= min;
		tm.tm_sec	= sec;
	}

	if (tm.tm_year > 1900)
		tm.tm_year -= 1900;
	else if (tm.tm_year < 70)
		tm.tm_year += 100;

	/* Set Daylight Saving Time field */
	current_time = time(NULL);
	tmp = localtime(&current_time);
	tm.tm_isdst = tmp->tm_isdst;

	return (mktime(&tm));
}

/*
 * Protect against directory disclosure attack by removing '..',
 * excessive '/' and '\' characters
 */
static void
remove_double_dots_and_double_slashes(char *s)
{
	char	*p = s;

	while (*s != '\0') {
		*p++ = *s++;
		if (s[-1] == '/' || s[-1] == '\\') {
			/* Skip all following slashes and backslashes */
			while (*s == '/' || *s == '\\')
				s++;

			/* Skip all double-dots */
			while (*s == '.' && s[1] == '.')
				s += 2;
		}
	}
	*p = '\0';
}

/*
 * Built-in mime types
 */
static const struct {
	const char	*extension;
	size_t		ext_len;
	const char	*mime_type;
	size_t		mime_type_len;
} mime_types[] = {
	{".html",	5,	"text/html",			9},
	{".htm",	4,	"text/html",			9},
	{".shtm",	5,	"text/html",			9},
	{".shtml",	6,	"text/html",			9},
	{".css",	4,	"text/css",			8},
	{".js",		3,	"application/x-javascript",	24},
	{".ico",	4,	"image/x-icon",			12},
	{".gif",	4,	"image/gif",			9},
	{".jpg",	4,	"image/jpeg",			10},
	{".jpeg",	5,	"image/jpeg",			10},
	{".png",	4,	"image/png",			9},
	{".svg",	4,	"image/svg+xml",		13},
	{".torrent",	8,	"application/x-bittorrent",	24},
	{".wav",	4,	"audio/x-wav",			11},
	{".mp3",	4,	"audio/x-mp3",			11},
	{".mid",	4,	"audio/mid",			9},
	{".m3u",	4,	"audio/x-mpegurl",		15},
	{".ram",	4,	"audio/x-pn-realaudio",		20},
	{".xml",	4,	"text/xml",			8},
	{".xslt",	5,	"application/xml",		15},
	{".ra",		3,	"audio/x-pn-realaudio",		20},
	{".doc",	4,	"application/msword",		19},
	{".exe",	4,	"application/octet-stream",	24},
	{".zip",	4,	"application/x-zip-compressed",	28},
	{".xls",	4,	"application/excel",		17},
	{".tgz",	4,	"application/x-tar-gz",		20},
	{".tar",	4,	"application/x-tar",		17},
	{".gz",		3,	"application/x-gunzip",		20},
	{".arj",	4,	"application/x-arj-compressed",	28},
	{".rar",	4,	"application/x-arj-compressed",	28},
	{".rtf",	4,	"application/rtf",		15},
	{".pdf",	4,	"application/pdf",		15},
	{".swf",	4,	"application/x-shockwave-flash",29},
	{".mpg",	4,	"video/mpeg",			10},
	{".mpeg",	5,	"video/mpeg",			10},
	{".asf",	4,	"video/x-ms-asf",		14},
	{".avi",	4,	"video/x-msvideo",		15},
	{".bmp",	4,	"image/bmp",			9},
	{NULL,		0,	NULL,				0}
};

/*
 * 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		i, path_len;

	path_len = strlen(path);

	/*
	 * Scan user-defined mime types first, in case user wants to
	 * override default mime types.
	 */
	lock_option(ctx, OPT_MIME_TYPES);
	list = ctx->options[OPT_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;
			unlock_option(ctx, OPT_MIME_TYPES);
			return;
		}
	}
	unlock_option(ctx, OPT_MIME_TYPES);

	/* Now scan built-in mime types */
	for (i = 0; mime_types[i].extension != NULL; i++) {
		ext = path + (path_len - mime_types[i].ext_len);
		if (path_len > mime_types[i].ext_len &&
		    mg_strcasecmp(ext, mime_types[i].extension) == 0) {
			vec->ptr = mime_types[i].mime_type;
			vec->len = mime_types[i].mime_type_len;
			return;
		}
	}

	/* Nothing found. Fall back to text/plain */
	vec->ptr = "text/plain";
	vec->len = 10;
}

#ifndef HAVE_MD5
typedef struct MD5Context {
	uint32_t	buf[4];
	uint32_t	bits[2];
	unsigned char	in[64];
} MD5_CTX;

#if __BYTE_ORDER == 1234
#define byteReverse(buf, len)	/* Nothing */
#else
/*
 * Note: this code is harmless on little-endian machines.
 */
static void
byteReverse(unsigned char *buf, unsigned longs)
{
	uint32_t t;
	do {
		t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
			((unsigned) buf[1] << 8 | buf[0]);
		*(uint32_t *) buf = t;
		buf += 4;
	} while (--longs);
}
#endif /* __BYTE_ORDER */

/* The four core functions - F1 is optimized somewhat */

/* #define F1(x, y, z) (x & y | ~x & z) */
#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))

/* This is the central step in the MD5 algorithm. */
#define MD5STEP(f, w, x, y, z, data, s) \
( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )

/*
 * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
 * initialization constants.
 */
static void
MD5Init(MD5_CTX *ctx)
{
	ctx->buf[0] = 0x67452301;
	ctx->buf[1] = 0xefcdab89;
	ctx->buf[2] = 0x98badcfe;
	ctx->buf[3] = 0x10325476;

	ctx->bits[0] = 0;
	ctx->bits[1] = 0;
}

/*
 * The core of the MD5 algorithm, this alters an existing MD5 hash to
 * reflect the addition of 16 longwords of new data.  MD5Update blocks
 * the data and converts bytes into longwords for this routine.
 */
static void
MD5Transform(uint32_t buf[4], uint32_t const in[16])
{
	register uint32_t a, b, c, d;

	a = buf[0];
	b = buf[1];
	c = buf[2];
	d = buf[3];

	MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
	MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
	MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
	MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
	MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
	MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
	MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
	MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
	MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
	MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
	MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
	MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
	MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
	MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
	MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
	MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);

	MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
	MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
	MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
	MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
	MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
	MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
	MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
	MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
	MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
	MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
	MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
	MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
	MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
	MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
	MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
	MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);

	MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
	MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
	MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
	MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
	MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
	MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
	MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
	MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
	MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
	MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
	MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
	MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
	MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
	MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
	MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
	MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);

	MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
	MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
	MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
	MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
	MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
	MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
	MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
	MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
	MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
	MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
	MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
	MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
	MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
	MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
	MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
	MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);

	buf[0] += a;
	buf[1] += b;
	buf[2] += c;
	buf[3] += d;
}

/*
 * Update context to reflect the concatenation of another buffer full
 * of bytes.
 */
static void
MD5Update(MD5_CTX *ctx, unsigned char const *buf, uint32_t len)
{
	uint32_t t;

	/* Update bitcount */

	t = ctx->bits[0];
	if ((ctx->bits[0] = t + (len << 3)) < t)
		ctx->bits[1]++;		/* Carry from low to high */
	ctx->bits[1] += len >> 29;

	t = (t >> 3) & 0x3f;	/* Bytes already in shsInfo->data */

	/* Handle any leading odd-sized chunks */

	if (t) {
		unsigned char *p = (unsigned char *) ctx->in + t;

		t = 64 - t;
		if (len < t) {
			memcpy(p, buf, len);
			return;
		}
		memcpy(p, buf, t);
		byteReverse(ctx->in, 16);
		MD5Transform(ctx->buf, (uint32_t *) ctx->in);
		buf += t;
		len -= t;
	}
	/* Process data in 64-byte chunks */

	while (len >= 64) {
		memcpy(ctx->in, buf, 64);
		byteReverse(ctx->in, 16);
		MD5Transform(ctx->buf, (uint32_t *) ctx->in);
		buf += 64;
		len -= 64;
	}

	/* Handle any remaining bytes of data. */

	memcpy(ctx->in, buf, len);
}

/*
 * Final wrapup - pad to 64-byte boundary with the bit pattern
 * 1 0* (64-bit count of bits processed, MSB-first)
 */
static void
MD5Final(unsigned char digest[16], MD5_CTX *ctx)
{
	unsigned count;
	unsigned char *p;

	/* Compute number of bytes mod 64 */
	count = (ctx->bits[0] >> 3) & 0x3F;

	/* Set the first char of padding to 0x80.  This is safe since there is
	   always at least one byte free */
	p = ctx->in + count;
	*p++ = 0x80;

	/* Bytes of padding needed to make 64 bytes */
	count = 64 - 1 - count;

	/* Pad out to 56 mod 64 */
	if (count < 8) {
		/* Two lots of padding:  Pad the first block to 64 bytes */
		memset(p, 0, count);
		byteReverse(ctx->in, 16);
		MD5Transform(ctx->buf, (uint32_t *) ctx->in);

		/* Now fill the next block with 56 bytes */
		memset(ctx->in, 0, 56);
	} else {
		/* Pad block to 56 bytes */
		memset(p, 0, count - 8);
	}
	byteReverse(ctx->in, 14);

	/* Append length in bits and transform */
	((uint32_t *) ctx->in)[14] = ctx->bits[0];
	((uint32_t *) ctx->in)[15] = ctx->bits[1];

	MD5Transform(ctx->buf, (uint32_t *) ctx->in);
	byteReverse((unsigned char *) ctx->buf, 4);
	memcpy(digest, ctx->buf, 16);
	memset((char *) ctx, 0, sizeof(ctx));	/* In case it's sensitive */
}
#endif /* !HAVE_MD5 */

/*
 * Stringify binary data. Output buffer must be twice as big as input,
 * because each byte takes 2 bytes in string representation
 */
static void
bin2str(char *to, const unsigned char *p, size_t len)
{
	static const char *hex = "0123456789abcdef";

	for (; len--; p++) {
		*to++ = hex[p[0] >> 4];
		*to++ = hex[p[0] & 0x0f];
	}
	*to = '\0';
}

/*
 * Return stringified MD5 hash for list of vectors.
 * buf must point to 33-bytes long buffer
 */
static void
mg_md5(char *buf, ...)
{
	unsigned char	hash[16];
	const char	*p;
	va_list		ap;
	MD5_CTX		ctx;

	MD5Init(&ctx);

	va_start(ap, buf);
	while ((p = va_arg(ap, const char *)) != NULL)
		MD5Update(&ctx, (unsigned char *) p, strlen(p));
	va_end(ap);

	MD5Final(hash, &ctx);
	bin2str(buf, hash, sizeof(hash));
}

/*
 * Check the user's password, return 1 if OK
 */
static bool_t
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];

	/* XXX  Due to a bug in MSIE, we do not compare the URI	 */
	/* Also, we do not check for authentication timeout */
	if (/*strcmp(dig->uri, c->ouri) != 0 || */
	    strlen(response) != 32 /*||
	    now - strtoul(dig->nonce, NULL, 10) > 3600 */)
		return (FALSE);

	mg_md5(ha2, method, ":", uri, NULL);
	mg_md5(expected_response, ha1, ":", nonce, ":", nc,
	    ":", cnonce, ":", qop, ":", ha2, NULL);

	return (!mg_strcasecmp(response, expected_response));
}

/*
 * Use the global passwords file, if specified by auth_gpass option,
 * or search for .htpasswd in the requested directory.
 */
static FILE *
open_auth_file(struct mg_connection *conn, const char *path)
{
	struct mg_context	*ctx = conn->ctx;
	char 			name[FILENAME_MAX];
	const char		*p, *e;
	struct mgstat		st;
	FILE			*fp;

	if (ctx->options[OPT_AUTH_GPASSWD] != NULL) {
		/* Use global passwords file */
		fp =  mg_fopen(ctx->options[OPT_AUTH_GPASSWD], "r");
		if (fp == NULL)
			cry(fc(ctx), "fopen(%s): %s",
			    ctx->options[OPT_AUTH_GPASSWD], strerror(ERRNO));
	} else if (!mg_stat(path, &st) && st.is_directory) {
		(void) mg_snprintf(conn, name, sizeof(name), "%s%c%s",
		    path, DIRSEP, PASSWORDS_FILE_NAME);
		fp = mg_fopen(name, "r");
	} else {
		/*
		 * Try to find .htpasswd in requested directory.
		 * Given the path, create the path to .htpasswd file
		 * in the same directory. Find the right-most
		 * directory separator character first. That would be the
		 * directory name. If directory separator character is not
		 * found, 'e' will point to 'p'.
		 */
		for (p = path, e = p + strlen(p) - 1; e > p; e--)
			if (IS_DIRSEP_CHAR(*e))
				break;

		/*
		 * Make up the path by concatenating directory name and
		 * .htpasswd file name.
		 */
		(void) mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
		    (int) (e - p), p, DIRSEP, PASSWORDS_FILE_NAME);
		fp = mg_fopen(name, "r");
	}

	return (fp);
}

/*
 * Parsed Authorization: header
 */
struct ah {
	char	*user, *uri, *cnonce, *response, *qop, *nc, *nonce;
};

static bool_t
parse_auth_header(struct mg_connection *conn, char *buf, size_t buf_size,
		struct ah *ah)
{
	char		*name, *value, *s;
	const char	*auth_header;

	if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
	    mg_strncasecmp(auth_header, "Digest ", 7) != 0)
		return (FALSE);

	/* Make modifiable copy of the auth header */
	(void) mg_strlcpy(buf, auth_header + 7, buf_size);

	s = buf;
	(void) memset(ah, 0, sizeof(*ah));

	/* Gobble initial spaces */
	while (isspace(* (unsigned char *) s))
		s++;

	/* Parse authorization header */
	for (;;) {
		name = skip(&s, "=");
		value = skip(&s, ", ");

		if (*value == '"') {
			value++;
			value[strlen(value) - 1] = '\0';
		} else if (*value == '\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);

	return (TRUE);
}

/*
 * Authorize against the opened passwords file. Return 1 if authorized.
 */
static bool_t
authorize(struct mg_connection *conn, FILE *fp)
{
	struct ah	ah;
	char		line[256], f_user[256], domain[256], ha1[256],
			buf[MAX_REQUEST_SIZE];

	if (!parse_auth_header(conn, buf, sizeof(buf), &ah))
		return (FALSE);

	/* Loop over passwords file */
	while (fgets(line, sizeof(line), fp) != NULL) {

		if (sscanf(line, "%[^:]:%[^:]:%s", f_user, domain, ha1) != 3)
			continue;

		if (!strcmp(ah.user, f_user) &&
		    !strcmp(domain, conn->ctx->options[OPT_AUTH_DOMAIN]))
			return (check_password(
			    conn->request_info.request_method, ha1,
			    ah.uri, ah.nonce, ah.nc, ah.cnonce,
			    ah.qop, ah.response));
	}

	return (FALSE);
}

/*
 * Return TRUE if request is authorised, FALSE otherwise.
 */
static bool_t
check_authorization(struct mg_connection *conn, const char *path)
{
	FILE		*fp;
	char		fname[FILENAME_MAX];
	struct vec	uri_vec, filename_vec;
	const char	*list;
	bool_t		authorized;

	fp = NULL;
	authorized = TRUE;

	lock_option(conn->ctx, OPT_PROTECT);
	list = conn->ctx->options[OPT_PROTECT];
	while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
		if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
			(void) mg_snprintf(conn, fname, sizeof(fname), "%.*s",
			    filename_vec.len, filename_vec.ptr);
			if ((fp = mg_fopen(fname, "r")) == NULL)
				cry(conn, "%s: cannot open %s: %s",
				    __func__, fname, strerror(errno));
			break;
		}
	}
	unlock_option(conn->ctx, OPT_PROTECT);

	if (fp == NULL)
		fp = open_auth_file(conn, path);

	if (fp != NULL) {
		authorized = authorize(conn, fp);
		(void) fclose(fp);
	}

	return (authorized);
}

static void
send_authorization_request(struct mg_connection *conn)
{
	conn->request_info.status_code = 401;
	(void) mg_printf(conn,
	    "HTTP/1.1 401 Unauthorized\r\n"
	    "WWW-Authenticate: Digest qop=\"auth\", "
	    "realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
	    conn->ctx->options[OPT_AUTH_DOMAIN], (unsigned long) time(NULL));
}

static bool_t
is_authorized_for_put(struct mg_connection *conn)
{
	FILE	*fp;
	int	ret = FALSE;

	if ((fp = mg_fopen(conn->ctx->options[OPT_AUTH_PUT], "r")) != NULL) {
		set_close_on_exec(fileno(fp));
		ret = authorize(conn, fp);
		(void) fclose(fp);
	}

	return (ret);
}

int
mg_modify_passwords_file(struct mg_context *ctx, const char *fname,
		const char *user, const char *pass)
{
	int		found;
	char		line[512], u[512], d[512], ha1[33], tmp[FILENAME_MAX];
	const char	*domain;
	FILE		*fp, *fp2;

	found = 0;
	fp = fp2 = NULL;
	domain = ctx->options[OPT_AUTH_DOMAIN];

	/* Regard empty password as no password - remove user record. */
	if (pass[0] == '\0')
		pass = NULL;

	(void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);

	/* Create the file if does not exist */
	if ((fp = mg_fopen(fname, "a+")) != NULL)
		(void) fclose(fp);

	/* Open the given file and temporary file */
	if ((fp = mg_fopen(fname, "r")) == NULL) {
		cry(fc(ctx), "Cannot open %s: %s", fname, strerror(errno));
		return (0);
	} else if ((fp2 = mg_fopen(tmp, "w+")) == NULL) {
		cry(fc(ctx), "Cannot open %s: %s", tmp, strerror(errno));
		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 {
			(void) fprintf(fp2, "%s", line);
		}
	}

	/* If new user, just add it */
	if (!found && pass != NULL) {
		mg_md5(ha1, user, ":", domain, ":", pass, NULL);
		(void) fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
	}

	/* Close files */
	(void) fclose(fp);
	(void) fclose(fp2);

	/* Put the temp file in place of real file */
	(void) mg_remove(fname);
	(void) mg_rename(tmp, fname);

	return (0);
}

struct de {
	struct mg_connection	*conn;
	char			*file_name;
	struct mgstat		st;
};

static void
url_encode(const char *src, char *dst, size_t dst_len)
{
	const char	*dont_escape = "._-$,;~()";
	const char	*hex = "0123456789abcdef";
	const char	*end = dst + dst_len - 1;
	
	for (; *src != '\0' && dst < end; src++, dst++) {
		if (isalnum(*(unsigned char *) src) ||
		    strchr(dont_escape, * (unsigned char *) src) != NULL) {
			*dst = *src;
		} else if (dst + 2 < end) {
			dst[0] = '%';
			dst[1] = hex[(* (unsigned char *) src) >> 4];
			dst[2] = hex[(* (unsigned char *) src) & 0xf];
			dst += 2;
		}
	}

	*dst = '\0';
}

/*
 * This function is called from send_directory() and prints out
 * single directory entry.
 */
static void
print_dir_entry(struct de *de)
{
	char		size[64], mod[64], href[FILENAME_MAX];

	if (de->st.is_directory) {
		(void) mg_snprintf(de->conn,
		    size, sizeof(size), "%s", "[DIRECTORY]");
	} else {
		/*
		 * We use (signed) cast below because MSVC 6 compiler cannot
		 * convert unsigned __int64 to double. Sigh.
		 */
		if (de->st.size < 1024)
			(void) mg_snprintf(de->conn, size, sizeof(size),
			    "%lu", (unsigned long) de->st.size);
		else if (de->st.size < 0x100000 /* 1024 * 1024 */)
			(void) mg_snprintf(de->conn, size, sizeof(size),
			    "%.1fk", (double) de->st.size / 1024.0);
		else if (de->st.size < 0x40000000 /* 1024 * 1024 * 1024 */)
			(void) mg_snprintf(de->conn, size, sizeof(size),
			    "%.1fM", (double) de->st.size / 1048576);
		else
			(void) mg_snprintf(de->conn, size, sizeof(size),
			  "%.1fG", (double) de->st.size / 1073741824);
	}
	(void) strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M",
		localtime(&de->st.mtime));

	url_encode(de->file_name, href, sizeof(href));

	de->conn->num_bytes_sent += mg_printf(de->conn,
	    "<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
	    "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
	    de->conn->request_info.uri, href, de->st.is_directory ? "/" : "",
	    de->file_name, de->st.is_directory ? "/" : "", mod, size);
}

/*
 * This function is called from send_directory() and used for
 * sorting direcotory entries by size, or name, or modification time.
 */
static int
compare_dir_entries(const void *p1, const void *p2)
{
	const struct de	*a = (struct de *) p1, *b = (struct de *) p2;
	const char	*query_string = a->conn->request_info.query_string;
	int		cmp_result = 0;

	if (query_string == NULL)
		query_string = "na";

	if (a->st.is_directory && !b->st.is_directory) {
		return (-1);  /* Always put directories on top */
	} else if (!a->st.is_directory && b->st.is_directory) {
		return (1);   /* Always put directories on top */
	} else if (*query_string == 'n') {
		cmp_result = strcmp(a->file_name, b->file_name);
	} else if (*query_string == 's') {
		cmp_result = a->st.size == b->st.size ? 0 :
			a->st.size > b->st.size ? 1 : -1;
	} else if (*query_string == 'd') {
		cmp_result = a->st.mtime == b->st.mtime ? 0 :
			a->st.mtime > b->st.mtime ? 1 : -1;
	}

	return (query_string[1] == 'd' ? -cmp_result : cmp_result);
}

/*
 * Send directory contents.
 */
static void
send_directory(struct mg_connection *conn, const char *dir)
{
	struct dirent	*dp;
	DIR		*dirp;
	struct de	*entries = NULL;
	char		path[FILENAME_MAX];
	int		i, sort_direction, num_entries = 0, arr_size = 128;

	if ((dirp = opendir(dir)) == NULL) {
		send_error(conn, 500, "Cannot open directory",
		    "Error: opendir(%s): %s", path, strerror(ERRNO));
		return;
	}

	(void) mg_printf(conn, "%s",
	    "HTTP/1.1 200 OK\r\n"
	    "Connection: close\r\n"
	    "Content-Type: text/html; charset=utf-8\r\n\r\n");

	sort_direction = conn->request_info.query_string != NULL &&
	    conn->request_info.query_string[1] == 'd' ? 'a' : 'd';

	while ((dp = readdir(dirp)) != NULL) {

		/* Do not show current dir and passwords file */
		if (!strcmp(dp->d_name, ".") ||
		    !strcmp(dp->d_name, "..") ||
		    !strcmp(dp->d_name, PASSWORDS_FILE_NAME))
			continue;

		if (entries == NULL || num_entries >= arr_size) {
			arr_size *= 2;
			entries = (struct de *) realloc(entries,
			    arr_size * sizeof(entries[0]));
		}

		if (entries == NULL) {
			send_error(conn, 500, "Cannot open directory",
			    "%s", "Error: cannot allocate memory");
			return;
		}

		(void) mg_snprintf(conn, path, sizeof(path), "%s%c%s",
		    dir, DIRSEP, dp->d_name);

		/*
		 * If we don't memset stat structure to zero, mtime will have
		 * garbage and strftime() will segfault later on in
		 * print_dir_entry(). memset is required only if mg_stat()
		 * fails. For more details, see
		 * http://code.google.com/p/mongoose/issues/detail?id=79
		 */
		if (mg_stat(path, &entries[num_entries].st) != 0)
			(void) memset(&entries[num_entries].st, 0,
			    sizeof(entries[num_entries].st));

		entries[num_entries].conn = conn;
		entries[num_entries].file_name = mg_strdup(dp->d_name);
		num_entries++;
	}
	(void) closedir(dirp);

	conn->num_bytes_sent += mg_printf(conn,
	    "<html><head><title>Index of %s</title>"
	    "<style>th {text-align: left;}</style></head>"
	    "<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
	    "<tr><th><a href=\"?n%c\">Name</a></th>"
	    "<th><a href=\"?d%c\">Modified</a></th>"
	    "<th><a href=\"?s%c\">Size</a></th></tr>"
	    "<tr><td colspan=\"3\"><hr></td></tr>",
	    conn->request_info.uri, conn->request_info.uri,
	    sort_direction, sort_direction, sort_direction);

	/* Print first entry - link to a parent directory */
	conn->num_bytes_sent += mg_printf(conn,
	    "<tr><td><a href=\"%s%s\">%s</a></td>"
	    "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
	    conn->request_info.uri, "..", "Parent directory", "-", "-");

	/* Sort and print directory entries */
	qsort(entries, num_entries, sizeof(entries[0]), compare_dir_entries);
	for (i = 0; i < num_entries; i++) {
		print_dir_entry(&entries[i]);
		free(entries[i].file_name);
	}
	free(entries);

	conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
	conn->request_info.status_code = 200;
}

/*
 * Send len bytes from the opened file to the client.
 */
static void
send_opened_file_stream(struct mg_connection *conn, FILE *fp, int64_t len)
{
	char	buf[BUFSIZ];
	int	to_read, num_read, num_written;

	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, to_read, fp)) == 0)
			break;

		/* Send read bytes to the client, exit the loop on error */
		if ((num_written = mg_write(conn, buf, num_read)) != num_read)
			break;

		/* Both read and were successful, adjust counters */
		conn->num_bytes_sent += num_written;
		len -= num_written;
	}
}

/*
 * Send regular file contents.
 */
static void
send_file(struct mg_connection *conn, const char *path, struct mgstat *stp)
{
	char		date[64], lm[64], etag[64], range[64];
	const char	*fmt = "%a, %d %b %Y %H:%M:%S %Z", *msg = "OK", *hdr;
	time_t		curtime = time(NULL);
	int64_t		cl, r1, r2;
	struct vec	mime_vec;
	FILE		*fp;
	int		n;

	get_mime_type(conn->ctx, path, &mime_vec);
	cl = stp->size;
	conn->request_info.status_code = 200;
	range[0] = '\0';

	if ((fp = mg_fopen(path, "rb")) == NULL) {
		send_error(conn, 500, http_500_error,
		    "fopen(%s): %s", path, strerror(ERRNO));
		return;
	}
	set_close_on_exec(fileno(fp));

	/* If Range: header specified, act accordingly */
	r1 = r2 = 0;
	hdr = mg_get_header(conn, "Range");
	if (hdr != NULL && (n = sscanf(hdr,
	    "bytes=%" INT64_FMT "-%" INT64_FMT, &r1, &r2)) > 0) {
		conn->request_info.status_code = 206;
		(void) fseeko(fp, (off_t) r1, SEEK_SET);
		cl = n == 2 ? r2 - r1 + 1: cl - r1;
		(void) mg_snprintf(conn, range, sizeof(range),
		    "Content-Range: bytes "
		    "%" INT64_FMT "-%"
		    INT64_FMT "/%" INT64_FMT "\r\n",
		    r1, r1 + cl - 1, stp->size);
		msg = "Partial Content";
	}

	/* Prepare Etag, Date, Last-Modified headers */
	(void) strftime(date, sizeof(date), fmt, localtime(&curtime));
	(void) strftime(lm, sizeof(lm), fmt, localtime(&stp->mtime));
	(void) mg_snprintf(conn, etag, sizeof(etag), "%lx.%lx",
	    (unsigned long) stp->mtime, (unsigned long) stp->size);

	(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: close\r\n"
	    "Accept-Ranges: bytes\r\n"
	    "%s\r\n",
	    conn->request_info.status_code, msg, date, lm, etag,
	    mime_vec.len, mime_vec.ptr, cl, range);

	if (strcmp(conn->request_info.request_method, "HEAD") != 0)
		send_opened_file_stream(conn, fp, cl);
	(void) fclose(fp);
}

/*
 * Parse HTTP headers from the given buffer, advance buffer to the point
 * where parsing stopped.
 */
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(buf, ": ");
		ri->http_headers[i].value = skip(buf, "\r\n");
		if (ri->http_headers[i].name[0] == '\0')
			break;
		ri->num_headers = i + 1;
	}
}

static bool_t
is_valid_http_method(const char *method)
{
	return (!strcmp(method, "GET") ||
	    !strcmp(method, "POST") ||
	    !strcmp(method, "HEAD") ||
	    !strcmp(method, "PUT") ||
	    !strcmp(method, "DELETE"));
}

/*
 * Parse HTTP request, fill in mg_request_info structure.
 */
static bool_t
parse_http_request(char *buf, struct mg_request_info *ri, const struct usa *usa)
{
	int	success_code = FALSE;

	ri->request_method = skip(&buf, " ");
	ri->uri = skip(&buf, " ");
	ri->http_version = skip(&buf, "\r\n");

	if (is_valid_http_method(ri->request_method) &&
	    ri->uri[0] == '/' &&
	    strncmp(ri->http_version, "HTTP/", 5) == 0) {
		ri->http_version += 5;   /* Skip "HTTP/" */
		parse_http_headers(&buf, ri);
		ri->remote_port = ntohs(usa->u.sin.sin_port);
		(void) memcpy(&ri->remote_ip, &usa->u.sin.sin_addr.s_addr, 4);
		ri->remote_ip = ntohl(ri->remote_ip);
		success_code = TRUE;
	}

	return (success_code);
}

/*
 * Keep reading the input (either opened file descriptor fd, or socket sock,
 * or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
 * buffer (which marks the end of HTTP request). Buffer buf may already
 * have some data. The length of the data is stored in nread.
 * Upon every read operation, increase nread by the number of bytes read.
 */
static int
read_request(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int bufsiz, int *nread)
{
	int	n, request_len;

	request_len = 0;
	while (*nread < bufsiz && request_len == 0) {
		n = pull(fp, sock, ssl, buf + *nread, bufsiz - *nread);
		if (n <= 0) {
			break;
		} else {
			*nread += n;
			request_len = get_request_len(buf, (size_t) *nread);
		}
	}

	return (request_len);
}

/*
 * For given directory path, substitute it to valid index file.
 * Return 0 if index file has been found, -1 if not found.
 * If the file is found, it's stats is returned in stp.
 */
static bool_t
substitute_index_file(struct mg_connection *conn,
		char *path, size_t path_len, struct mgstat *stp)
{
	const char	*list;
	struct mgstat	st;
	struct vec	filename_vec;
	size_t		n;
	bool_t		found;

	n = strlen(path);

	/*
	 * The 'path' given to us points to the directory. Remove all trailing
	 * directory separator characters from the end of the path, and
	 * then append single directory separator character.
	 */
	while (n > 0 && IS_DIRSEP_CHAR(path[n - 1]))
		n--;
	path[n] = DIRSEP;

	/*
	 * Traverse index files list. For each entry, append it to the given
	 * path and see if the file exists. If it exists, break the loop
	 */
	lock_option(conn->ctx, OPT_INDEX_FILES);
	list = conn->ctx->options[OPT_INDEX_FILES];
	found = FALSE;

	while ((list = next_option(list, &filename_vec, NULL)) != NULL) {

		/* Ignore too long entries that may overflow path buffer */
		if (filename_vec.len > path_len - n)
			continue;

		/* Prepare full path to the index file  */
		(void) mg_strlcpy(path + n + 1,
		    filename_vec.ptr, filename_vec.len + 1);

		/* Does it exist ? */
		if (mg_stat(path, &st) == 0) {
			/* Yes it does, break the loop */
			*stp = st;
			found = TRUE;
			break;
		}
	}
	unlock_option(conn->ctx, OPT_INDEX_FILES);

	/* If no index file exists, restore directory path */
	if (found == FALSE)
		path[n] = '\0';

	return (found);
}

static void
remove_callback(struct mg_context *ctx,
		const char *uri_regex, int status_code, bool_t is_auth)
{
	struct callback	*cb;
	int		i;

	for (i = 0; i < ctx->num_callbacks; i++) {
		cb = ctx->callbacks + i;
		if ((uri_regex != NULL && cb->uri_regex != NULL &&
		    ((is_auth && cb->is_auth) || (!is_auth && !cb->is_auth)) &&
		    !strcmp(uri_regex, cb->uri_regex)) || (uri_regex == NULL &&
		     (cb->status_code == 0 ||
		      cb->status_code == status_code))) {
			(void) memmove(cb, cb + 1,
			    (char *) (ctx->callbacks + ctx->num_callbacks) -
			    (char *) (cb + 1));
			break;
		}
	}
}

static void
add_callback(struct mg_context *ctx, const char *uri_regex, int status_code,
		mg_callback_t func, bool_t is_auth, void *user_data)
{
	struct callback	*cb;

	pthread_mutex_lock(&ctx->bind_mutex);
	if (func == NULL) {
		remove_callback(ctx, uri_regex, status_code, is_auth);
	} else if (ctx->num_callbacks >= (int) ARRAY_SIZE(ctx->callbacks) - 1) {
		cry(fc(ctx), "Too many callbacks! Increase MAX_CALLBACKS.");
	} else {
		cb = &ctx->callbacks[ctx->num_callbacks];
		cb->uri_regex = uri_regex ? mg_strdup(uri_regex) : NULL;
		cb->func = func;
		cb->is_auth = is_auth;
		cb->status_code = status_code;
		cb->user_data = user_data;
		ctx->num_callbacks++;
		DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: uri %s code %d",
		    __func__, uri_regex ? uri_regex : "NULL", status_code));
	}
	pthread_mutex_unlock(&ctx->bind_mutex);
}

void
mg_set_uri_callback(struct mg_context *ctx, const char *uri_regex,
		mg_callback_t func, void *user_data)
{
	assert(uri_regex != NULL);
	add_callback(ctx, uri_regex, -1, func, FALSE, user_data);
}

void
mg_set_error_callback(struct mg_context *ctx, int error_code,
		mg_callback_t func, void *user_data)
{
	assert(error_code >= 0 && error_code < 1000);
	add_callback(ctx, NULL, error_code, func, FALSE, user_data);
}

void
mg_set_auth_callback(struct mg_context *ctx, const char *uri_regex,
		mg_callback_t func, void *user_data)
{
	assert(uri_regex != NULL);
	add_callback(ctx, uri_regex, -1, func, TRUE, user_data);
}

/*
 * Return True if we should reply 304 Not Modified.
 */
static bool_t
is_not_modified(const struct mg_connection *conn, const struct mgstat *stp)
{
	const char *ims = mg_get_header(conn, "If-Modified-Since");
	return (ims != NULL && stp->mtime < date_to_epoch(ims));
}

static bool_t
append_chunk(struct mg_request_info *ri, FILE *fp, const char *buf, int len)
{
	bool_t	ret_code = TRUE;

	if (fp == NULL) {
		/* TODO: check for NULL here */
		ri->post_data = (char *) realloc(ri->post_data,
		    ri->post_data_len + len);
		(void) memcpy(ri->post_data + ri->post_data_len, buf, len);
		ri->post_data_len += len;
	} else if (push(fp, INVALID_SOCKET,
	    NULL, buf, (int64_t) len) != (int64_t) len) {
		ret_code = FALSE;
	}

	return (ret_code);
}

static bool_t
handle_request_body(struct mg_connection *conn, FILE *fp)
{
	struct mg_request_info	*ri = &conn->request_info;
	const char	*expect, *tmp;
	int64_t		content_len;
	char		buf[BUFSIZ];
	int		to_read, nread, already_read;
	bool_t		success_code = FALSE;

	content_len = get_content_length(conn);
	expect = mg_get_header(conn, "Expect");

	if (content_len == -1) {
		send_error(conn, 411, "Length Required", "");
	} else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
		send_error(conn, 417, "Expectation Failed", "");
	} else {
		if (expect != NULL)
			(void) mg_printf(conn, "HTTP/1.1 100 Continue\r\n\r\n");

		already_read = ri->post_data_len;
		assert(already_read >= 0);

		if (content_len <= (int64_t) already_read) {
			ri->post_data_len = (int) content_len;
			/*
			 * If fp is NULL, this is embedded mode, and we do not
			 * have to do anything: POST data is already there,
			 * no need to allocate a buffer and copy it in.
			 * If fp != NULL, we need to write the data.
			 */
			success_code = fp == NULL || (push(fp, INVALID_SOCKET,
			    NULL, ri->post_data, content_len) == content_len) ?
			    TRUE : FALSE;
		} else {

			if (fp == NULL) {
				conn->free_post_data = TRUE;
				tmp = ri->post_data;
				/* +1 in case if already_read == 0 */
				ri->post_data = (char*)malloc(already_read + 1);
				(void) memcpy(ri->post_data, tmp, already_read);
			} else {
				(void) push(fp, INVALID_SOCKET, NULL,
				    ri->post_data, (int64_t) already_read);
			}

			content_len -= already_read;

			while (content_len > 0) {
				to_read = sizeof(buf);
				if ((int64_t) to_read > content_len)
					to_read = (int) content_len;
				nread = pull(NULL, conn->client.sock,
				    conn->ssl, buf, to_read);
				if (nread <= 0)
					break;
				if (!append_chunk(ri, fp, buf, nread))
					break;
				content_len -= nread;
			}
			success_code = content_len == 0 ? TRUE : FALSE;
		}

		/* Each error code path in this function must send an error */
		if (success_code != TRUE)
			send_error(conn, 577, http_500_error,
			    "%s", "Error handling body data");
	}

	return (success_code);
}

#if !defined(NO_CGI)

/*
 * This structure helps to create an environment for the spawned CGI program.
 * Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
 * last element must be NULL.
 * However, on Windows there is a requirement that all these VARIABLE=VALUE\0
 * strings must reside in a contiguous buffer. The end of the buffer is
 * marked by two '\0' characters.
 * We satisfy both worlds: we create an envp array (which is vars), all
 * entries are actually pointers inside buf.
 */
struct cgi_env_block {
	struct mg_connection *conn;
	char	buf[CGI_ENVIRONMENT_SIZE];	/* Environment buffer	*/
	int	len;				/* Space taken		*/
	char	*vars[MAX_CGI_ENVIR_VARS];	/* char **envp		*/
	int	nvars;				/* Number of variables	*/
};

/*
 * Append VARIABLE=VALUE\0 string to the buffer, and add a respective
 * pointer into the vars array.
 */
static char *
addenv(struct cgi_env_block *block, const char *fmt, ...)
{
	int	n, space;
	char	*added;
	va_list	ap;

	/* Calculate how much space is left in the buffer */
	space = sizeof(block->buf) - block->len - 2;
	assert(space >= 0);

	/* Make a pointer to the free space int the buffer */
	added = block->buf + block->len;

	/* Copy VARIABLE=VALUE\0 string into the free space */
	va_start(ap, fmt);
	n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
	va_end(ap);

	/* Make sure we do not overflow buffer and the envp array */
	if (n > 0 && n < space &&
	    block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
		/* Append a pointer to the added string into the envp array */
		block->vars[block->nvars++] = block->buf + block->len;
		/* Bump up used length counter. Include \0 terminator */
		block->len += n + 1;
	}

	return (added);
}

static void
prepare_cgi_environment(struct mg_connection *conn, const char *prog,
		struct cgi_env_block *blk)
{
	const char	*s, *script_filename, *root, *slash;
	struct vec	var_vec;
	char		*p;
	int		i;

	blk->len = blk->nvars = 0;
	blk->conn = conn;

	/* SCRIPT_FILENAME */
	script_filename = prog;
	if ((s = strrchr(prog, '/')) != NULL)
		script_filename = s + 1;

	lock_option(conn->ctx, OPT_ROOT);
	root = conn->ctx->options[OPT_ROOT];
	addenv(blk, "SERVER_NAME=%s", conn->ctx->options[OPT_AUTH_DOMAIN]);
	unlock_option(conn->ctx, OPT_ROOT);

	/* Prepare the environment block */
	addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
	addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
	addenv(blk, "%s", "REDIRECT_STATUS=200");	/* PHP */
	addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.u.sin.sin_port));
	addenv(blk, "SERVER_ROOT=%s", root);
	addenv(blk, "DOCUMENT_ROOT=%s", root);
	addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
	addenv(blk, "REMOTE_ADDR=%s",
	    inet_ntoa(conn->client.rsa.u.sin.sin_addr));
	addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
	addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);

	slash = strrchr(conn->request_info.uri, '/');
	addenv(blk, "SCRIPT_NAME=%.*s%s",
	    (slash - conn->request_info.uri) + 1, conn->request_info.uri,
	    script_filename);

	addenv(blk, "SCRIPT_FILENAME=%s", script_filename);	/* PHP */
	addenv(blk, "PATH_TRANSLATED=%s", prog);
	addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");

	if ((s = mg_get_header(conn, "Content-Type")) != NULL)
		addenv(blk, "CONTENT_TYPE=%s", s);

	if (conn->request_info.query_string != NULL)
		addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);

	if ((s = mg_get_header(conn, "Content-Length")) != NULL)
		addenv(blk, "CONTENT_LENGTH=%s", s);

	if ((s = getenv("PATH")) != NULL)
		addenv(blk, "PATH=%s", s);

#if defined(_WIN32)
	if ((s = getenv("COMSPEC")) != NULL)
		addenv(blk, "COMSPEC=%s", s);
	if ((s = getenv("SYSTEMROOT")) != NULL)
		addenv(blk, "SYSTEMROOT=%s", s);
#else
	if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
		addenv(blk, "LD_LIBRARY_PATH=%s", s);
#endif /* _WIN32 */

	if ((s = getenv("PERLLIB")) != NULL)
		addenv(blk, "PERLLIB=%s", s);

	if (conn->request_info.remote_user != NULL) {
		addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
		addenv(blk, "%s", "AUTH_TYPE=Digest");
	}

	/* Add all headers as HTTP_* variables */
	for (i = 0; i < conn->request_info.num_headers; i++) {
		p = addenv(blk, "HTTP_%s=%s",
		    conn->request_info.http_headers[i].name,
		    conn->request_info.http_headers[i].value);

		/* Convert variable name into uppercase, and change - to _ */
		for (; *p != '=' && *p != '\0'; p++) {
			if (*p == '-')
				*p = '_';
			*p = (char) toupper(* (unsigned char *) p);
		}
	}

	/* Add user-specified variables */
	lock_option(conn->ctx, OPT_CGI_ENV);
	s = conn->ctx->options[OPT_CGI_ENV];
	while ((s = next_option(s, &var_vec, NULL)) != NULL)
		addenv(blk, "%.*s", var_vec.len, var_vec.ptr);
	unlock_option(conn->ctx, OPT_CGI_ENV);

	blk->vars[blk->nvars++] = NULL;
	blk->buf[blk->len++] = '\0';

	assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
	assert(blk->len > 0);
	assert(blk->len < (int) sizeof(blk->buf));
}

static void
send_cgi(struct mg_connection *conn, const char *prog)
{
	int			headers_len, data_len, i;
	const char		*status;
	char			buf[MAX_REQUEST_SIZE], *pbuf;
	struct mg_request_info	ri;
	struct cgi_env_block	blk;
	char			dir[FILENAME_MAX], *p;
	int			fd_stdin[2], fd_stdout[2];
	FILE			*in, *out;
	pid_t			pid;

	prepare_cgi_environment(conn, prog, &blk);

	/* CGI must be executed in its own directory */
	(void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
	if ((p = strrchr(dir, DIRSEP)) != NULL)
		*p++ = '\0';

	pid = (pid_t) -1;
	fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1;
	in = out = NULL;

	if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) {
		send_error(conn, 500, http_500_error,
		    "Cannot create CGI pipe: %s", strerror(ERRNO));
		goto done;
	} else if ((pid = spawn_process(conn, p, blk.buf, blk.vars,
	    fd_stdin[0], fd_stdout[1], dir)) == (pid_t) -1) {
		goto done;
	} else if ((in = fdopen(fd_stdin[1], "wb")) == NULL ||
	    (out = fdopen(fd_stdout[0], "rb")) == NULL) {
		send_error(conn, 500, http_500_error,
		    "fopen: %s", strerror(ERRNO));
		goto done;
	}

	setbuf(in, NULL);
	setbuf(out, NULL);

	/*
	 * spawn_process() must close those!
	 * If we don't mark them as closed, close() attempt before
	 * return from this function throws an exception on Windows.
	 * Windows does not like when closed descriptor is closed again.
	 */
	fd_stdin[0] = fd_stdout[1] = -1;

	/* Send POST data to the CGI process if needed */
	if (!strcmp(conn->request_info.request_method, "POST") &&
	    !handle_request_body(conn, in)) {
		goto done;
	}

	/*
	 * Now read CGI reply into a buffer. We need to set correct
	 * status code, thus we need to see all HTTP headers first.
	 * Do not send anything back to client, until we buffer in all
	 * HTTP headers.
	 */
	data_len = 0;
	headers_len = read_request(out, INVALID_SOCKET, NULL,
	    buf, sizeof(buf), &data_len);
	if (headers_len <= 0) {
		send_error(conn, 500, http_500_error,
		    "CGI program sent malformed HTTP headers: [%.*s]",
		    data_len, buf);
		goto done;
	}
	pbuf = buf;
	buf[headers_len - 1] = '\0';
	parse_http_headers(&pbuf, &ri);

	/* Make up and send the status line */
	status = get_header(&ri, "Status");
	conn->request_info.status_code = status == NULL ? 200 : atoi(status);
	(void) mg_printf(conn, "HTTP/1.1 %d OK\r\n",
	    conn->request_info.status_code);

	/* Send headers */
	for (i = 0; i < ri.num_headers; i++)
		(void) mg_printf(conn, "%s: %s\r\n",
		    ri.http_headers[i].name,
		    ri.http_headers[i].value);
	(void) mg_write(conn, "\r\n", 2);

	/* Send chunk of data that may be read after the headers */
	conn->num_bytes_sent += mg_write(conn,
	    buf + headers_len, data_len - headers_len);

	/* Read the rest of CGI output and send to the client */
	send_opened_file_stream(conn, out, INT64_MAX);

done:
	if (pid != (pid_t) -1)
		kill(pid, SIGTERM);
	if (fd_stdin[0] != -1)
		(void) close(fd_stdin[0]);
	if (fd_stdout[1] != -1)
		(void) close(fd_stdout[1]);

	if (in != NULL)
		(void) fclose(in);
	else if (fd_stdin[1] != -1)
		(void) close(fd_stdin[1]);

	if (out != NULL)
		(void) fclose(out);
	else if (fd_stdout[0] != -1)
		(void) close(fd_stdout[0]);
}
#endif /* !NO_CGI */

/*
 * For a given PUT path, create all intermediate subdirectories
 * for given path. Return 0 if the path itself is a directory,
 * or -1 on error, 1 if OK.
 */
static int
put_dir(const char *path)
{
	char		buf[FILENAME_MAX];
	const char	*s, *p;
	struct mgstat	st;
	size_t		len;

	for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
		len = p - path;
		assert(len < sizeof(buf));
		(void) memcpy(buf, path, len);
		buf[len] = '\0';

		/* Try to create intermediate directory */
		if (mg_stat(buf, &st) == -1 && mg_mkdir(buf, 0755) != 0)
			return (-1);

		/* Is path itself a directory ? */
		if (p[1] == '\0')
			return (0);
	}

	return (1);
}

static void
put_file(struct mg_connection *conn, const char *path)
{
	struct mgstat	st;
	FILE		*fp;
	int		rc;

	conn->request_info.status_code = mg_stat(path, &st) == 0 ? 200 : 201;

	if (mg_get_header(conn, "Range")) {
		send_error(conn, 501, "Not Implemented",
		    "%s", "Range support for PUT requests is not implemented");
	} else if ((rc = put_dir(path)) == 0) {
		(void) mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n",
		    conn->request_info.status_code);
	} else if (rc == -1) {
		send_error(conn, 500, http_500_error,
		    "put_dir(%s): %s", path, strerror(ERRNO));
	} else if ((fp = mg_fopen(path, "wb+")) == NULL) {
		send_error(conn, 500, http_500_error,
		    "fopen(%s): %s", path, strerror(ERRNO));
	} else {
		set_close_on_exec(fileno(fp));
		if (handle_request_body(conn, fp))
			(void) mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n",
			    conn->request_info.status_code);
		(void) fclose(fp);
	}
}

#if !defined(NO_SSI)
static void send_ssi_file(struct mg_connection *, const char *, FILE *, int);

static void
do_ssi_include(struct mg_connection *conn, const char *ssi, char *tag,
		int include_level)
{
	char	file_name[BUFSIZ], path[FILENAME_MAX], *p;
	FILE	*fp;

	/*
	 * sscanf() is safe here, since send_ssi_file() also uses buffer
	 * of size BUFSIZ to get the tag. So strlen(tag) is always < BUFSIZ.
	 */
	if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
		/* File name is relative to the webserver root */
		lock_option(conn->ctx, OPT_ROOT);
		(void) mg_snprintf(conn, path, sizeof(path), "%s%c%s",
		    conn->ctx->options[OPT_ROOT], DIRSEP, file_name);
		unlock_option(conn->ctx, OPT_ROOT);
	} else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1) {
		/*
		 * File name is relative to the webserver working directory
		 * or it is absolute system path
		 */
		(void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
	} else if (sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
		/* File name is relative to the currect document */
		(void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
		if ((p = strrchr(path, DIRSEP)) != NULL)
			p[1] = '\0';
		(void) mg_snprintf(conn, path + strlen(path),
		    sizeof(path) - strlen(path), "%s", file_name);
	} else {
		cry(conn, "Bad SSI #include: [%s]", tag);
		return;
	}

	if ((fp = mg_fopen(path, "rb")) == NULL) {
		cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
		    tag, path, strerror(ERRNO));
	} else {
		set_close_on_exec(fileno(fp));
		if (match_extension(path,
		    conn->ctx->options[OPT_SSI_EXTENSIONS])) {
			send_ssi_file(conn, path, fp, include_level + 1);
		} else {
			send_opened_file_stream(conn, fp, INT64_MAX);
		}
		(void) fclose(fp);
	}
}

static void
do_ssi_exec(struct mg_connection *conn, char *tag)
{
	char	cmd[BUFSIZ];
	FILE	*fp;

	if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
		cry(conn, "Bad SSI #exec: [%s]", tag);
	} else if ((fp = popen(cmd, "r")) == NULL) {
		cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
	} else {
		send_opened_file_stream(conn, fp, INT64_MAX);
		(void) pclose(fp);
	}
}

static void
send_ssi_file(struct mg_connection *conn, const char *path, FILE *fp,
		int include_level)
{
	char	buf[BUFSIZ];
	int	ch, len, in_ssi_tag;

	if (include_level > 10) {
		cry(conn, "SSI #include level is too deep (%s)", path);
		return;
	}

	in_ssi_tag = FALSE;
	len = 0;

	while ((ch = fgetc(fp)) != EOF) {
		if (in_ssi_tag && ch == '>') {
			in_ssi_tag = FALSE;
			buf[len++] = ch & 0xff;
			buf[len] = '\0';
			assert(len <= (int) sizeof(buf));
			if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
				/* Not an SSI tag, pass it */
				(void) mg_write(conn, buf, len);
			} else {
				if (!memcmp(buf + 5, "include", 7)) {
					do_ssi_include(conn, path, buf + 12,
					    include_level);
				} else if (!memcmp(buf + 5, "exec", 4)) {
					do_ssi_exec(conn, buf + 9);
				} else {
					cry(conn, "%s: unknown SSI "
					    "command: \"%s\"", path, buf);
				}
			}
			len = 0;
		} else if (in_ssi_tag) {
			if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
				/* Not an SSI tag */
				in_ssi_tag = FALSE;
			} else if (len == (int) sizeof(buf) - 2) {
				cry(conn, "%s: SSI tag is too large", path);
				len = 0;
			}
			buf[len++] = ch & 0xff;
		} else if (ch == '<') {
			in_ssi_tag = TRUE;
			if (len > 0)
				(void) mg_write(conn, buf, len);
			len = 0;
			buf[len++] = ch & 0xff;
		} else {
			buf[len++] = ch & 0xff;
			if (len == (int) sizeof(buf)) {
				(void) mg_write(conn, buf, len);
				len = 0;
			}
		}
	}

	/* Send the rest of buffered data */
	if (len > 0)
		(void) mg_write(conn, buf, len);

}

static void
send_ssi(struct mg_connection *conn, const char *path)
{
	FILE	*fp;

	if ((fp = mg_fopen(path, "rb")) == NULL) {
		send_error(conn, 500, http_500_error,
		    "fopen(%s): %s", path, strerror(ERRNO));
	} else {
		set_close_on_exec(fileno(fp));
		(void) mg_printf(conn, "%s", "HTTP/1.1 200 OK\r\n"
		    "Content-Type: text/html\r\nConnection: close\r\n\r\n");
		send_ssi_file(conn, path, fp, 0);
		(void) fclose(fp);
	}
}
#endif /* !NO_SSI */

void
mg_authorize(struct mg_connection *conn)
{
	conn->embedded_auth = TRUE;
}

static bool_t
check_embedded_authorization(struct mg_connection *conn)
{
	const struct callback	*cb;
	bool_t			authorized;

	authorized = TRUE;
	cb = find_callback(conn->ctx, TRUE, conn->request_info.uri, -1);

	if (cb != NULL) {
		cb->func(conn, &conn->request_info, cb->user_data);
		authorized = conn->embedded_auth;
	}

	return (authorized);
}

/*
 * This is the heart of the Mongoose's logic.
 * This function is called when the request is read, parsed and validated,
 * and Mongoose must decide what action to take: serve a file, or
 * a directory, or call embedded function, etcetera.
 */
static void
analyze_request(struct mg_connection *conn)
{
	struct mg_request_info *ri = &conn->request_info;
	char			path[FILENAME_MAX], *uri = ri->uri;
	struct mgstat		st;
	const struct callback	*cb;

	if ((conn->request_info.query_string = strchr(uri, '?')) != NULL)
		* conn->request_info.query_string++ = '\0';

	(void) url_decode(uri, (int) strlen(uri), uri, strlen(uri) + 1, FALSE);
	remove_double_dots_and_double_slashes(uri);
	convert_uri_to_file_name(conn, uri, path, sizeof(path));

	if (!check_authorization(conn, path)) {
		send_authorization_request(conn);
	} else if (check_embedded_authorization(conn) == FALSE) {
		/*
		 * Embedded code failed authorization. Do nothing here, since
		 * an embedded code must handle this itself by either
		 * showing proper error message, or redirecting to some
		 * sort of login page, or something else.
		 */
	} else if ((cb = find_callback(conn->ctx, FALSE, uri, -1)) != NULL) {
		if ((strcmp(ri->request_method, "POST") != 0 &&
		    strcmp(ri->request_method, "PUT") != 0) ||
		    handle_request_body(conn, NULL))
			cb->func(conn, &conn->request_info, cb->user_data);
	} else if (strstr(path, PASSWORDS_FILE_NAME)) {
		/* Do not allow to view passwords files */
		send_error(conn, 403, "Forbidden", "Access Forbidden");
	} else if ((!strcmp(ri->request_method, "PUT") ||
	    !strcmp(ri->request_method, "DELETE")) &&
	    (conn->ctx->options[OPT_AUTH_PUT] == NULL ||
	     !is_authorized_for_put(conn))) {
		send_authorization_request(conn);
	} else if (!strcmp(ri->request_method, "PUT")) {
		put_file(conn, path);
	} else if (!strcmp(ri->request_method, "DELETE")) {
		if (mg_remove(path) == 0)
			send_error(conn, 200, "OK", "");
		else
			send_error(conn, 500, http_500_error,
			    "remove(%s): %s", path, strerror(ERRNO));
	} else if (mg_stat(path, &st) != 0) {
		send_error(conn, 404, "Not Found", "%s", "File not found");
	} else if (st.is_directory && uri[strlen(uri) - 1] != '/') {
		(void) mg_printf(conn,
		    "HTTP/1.1 301 Moved Permanently\r\n"
		    "Location: %s/\r\n\r\n", uri);
	} else if (st.is_directory &&
	    substitute_index_file(conn, path, sizeof(path), &st) == FALSE) {
		if (is_true(conn->ctx->options[OPT_DIR_LIST])) {
			send_directory(conn, path);
		} else {
			send_error(conn, 403, "Directory Listing Denied",
			    "Directory listing denied");
		}
#if !defined(NO_CGI)
	} else if (match_extension(path,
	    conn->ctx->options[OPT_CGI_EXTENSIONS])) {
		if (strcmp(ri->request_method, "POST") &&
		    strcmp(ri->request_method, "GET")) {
			send_error(conn, 501, "Not Implemented",
			    "Method %s is not implemented", ri->request_method);
		} else {
			send_cgi(conn, path);
		}
#endif /* NO_CGI */
#if !defined(NO_SSI)
	} else if (match_extension(path,
	    conn->ctx->options[OPT_SSI_EXTENSIONS])) {
		send_ssi(conn, path);
#endif /* NO_SSI */
	} else if (is_not_modified(conn, &st)) {
		send_error(conn, 304, "Not Modified", "");
	} else {
		send_file(conn, path, &st);
	}
}

static void
close_all_listening_sockets(struct mg_context *ctx)
{
	int	i;

	for (i = 0; i < ctx->num_listeners; i++)
		(void) closesocket(ctx->listeners[i].sock);
	ctx->num_listeners = 0;
}

static bool_t
set_ports_option(struct mg_context *ctx, const char *list)
{
	SOCKET		sock;
	int		is_ssl;
	struct vec	vec;
	struct socket	*listener;

	close_all_listening_sockets(ctx);
	assert(ctx->num_listeners == 0);

	while ((list = next_option(list, &vec, NULL)) != NULL) {

		is_ssl	= vec.ptr[vec.len - 1] == 's' ? TRUE : FALSE;
		listener = ctx->listeners + ctx->num_listeners;

		if (ctx->num_listeners >=
		    (int) (ARRAY_SIZE(ctx->listeners) - 1)) {
			cry(fc(ctx), "%s", "Too many listeninig sockets");
			return (FALSE);
		} else if ((sock = mg_open_listening_port(ctx,
		    vec.ptr, &listener->lsa)) == INVALID_SOCKET) {
			cry(fc(ctx), "cannot bind to %.*s", vec.len, vec.ptr);
			return (FALSE);
		} else if (is_ssl == TRUE && ctx->ssl_ctx == NULL) {
			(void) closesocket(sock);
			cry(fc(ctx), "cannot add SSL socket, please specify "
			    "-ssl_cert option BEFORE -ports option");
			return (FALSE);
		} else {
			listener->sock = sock;
			listener->is_ssl = is_ssl;
			ctx->num_listeners++;
		}
	}

	return (TRUE);
}

static void
log_header(const struct mg_connection *conn, const char *header, FILE *fp)
{
	const char	*header_value;

	if ((header_value = mg_get_header(conn, header)) == NULL) {
		(void) fprintf(fp, "%s", " -");
	} else {
		(void) fprintf(fp, " \"%s\"", header_value);
	}
}

static void
log_access(const struct mg_connection *conn)
{
	const struct mg_request_info *ri;
	char		date[64];

	if (conn->ctx->access_log == NULL)
		return;

	(void) strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
	    localtime(&conn->birth_time));

	ri = &conn->request_info;

	flockfile(conn->ctx->access_log);

	(void) fprintf(conn->ctx->access_log,
	    "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
	    inet_ntoa(conn->client.rsa.u.sin.sin_addr),
	    ri->remote_user == NULL ? "-" : ri->remote_user,
	    date,
	    ri->request_method ? ri->request_method : "-",
	    ri->uri ? ri->uri : "-",
	    ri->http_version,
	    conn->request_info.status_code, conn->num_bytes_sent);
	log_header(conn, "Referer", conn->ctx->access_log);
	log_header(conn, "User-Agent", conn->ctx->access_log);
	(void) fputc('\n', conn->ctx->access_log);
	(void) fflush(conn->ctx->access_log);

	funlockfile(conn->ctx->access_log);
}

static bool_t
isbyte(int n) {
	return (n >= 0 && n <= 255);
}

/*
 * Verify given socket address against the ACL.
 * Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
 */
static int
check_acl(struct mg_context *ctx, const char *list, const struct usa *usa)
{
	int		a, b, c, d, n, mask, allowed;
	char		flag;
	uint32_t	acl_subnet, acl_mask, remote_ip;
	struct vec	vec;

	(void) memcpy(&remote_ip, &usa->u.sin.sin_addr, sizeof(remote_ip));

	/* If any ACL is set, deny by default */
	allowed = '-';

	while ((list = next_option(list, &vec, NULL)) != NULL) {

		mask = 32;

		if (sscanf(vec.ptr, "%c%d.%d.%d.%d%n",
		    &flag, &a, &b, &c, &d, &n) != 5) {
			cry(fc(ctx),
			    "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
			return (-1);
		} else if (flag != '+' && flag != '-') {
			cry(fc(ctx), "%s: flag must be + or -: [%s]",
			    __func__, vec.ptr);
			return (-1);
		} else if (!isbyte(a)||!isbyte(b)||!isbyte(c)||!isbyte(d)) {
			cry(fc(ctx),
			    "%s: bad ip address: [%s]", __func__, vec.ptr);
			return (-1);
		} else if (sscanf(vec.ptr + n, "/%d", &mask) == 0) {
			/* Do nothing, no mask specified */
		} else if (mask < 0 || mask > 32) {
			cry(fc(ctx), "%s: bad subnet mask: %d [%s]",
			    __func__, n, vec.ptr);
			return (-1);
		}

		acl_subnet = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | (uint32_t)d;
		acl_mask = mask ? 0xffffffffU << (32 - mask) : 0;

		if (acl_subnet == (ntohl(remote_ip) & acl_mask))
			allowed = flag;
	}

	return (allowed == '+' ? 1 : 0);
}

static void
add_to_set(SOCKET fd, fd_set *set, int *max_fd)
{
	FD_SET(fd, set);
	if (fd > (SOCKET) *max_fd)
		*max_fd = (int) fd;
}

/*
 * Deallocate mongoose context, free up the resources
 */
static void
mg_fini(struct mg_context *ctx)
{
	int	i;

	close_all_listening_sockets(ctx);

	/* Wait until all threads finish */
	(void) pthread_mutex_lock(&ctx->thr_mutex);
	while (ctx->num_threads > 0)
		(void) pthread_cond_wait(&ctx->thr_cond, &ctx->thr_mutex);
	(void) pthread_mutex_unlock(&ctx->thr_mutex);

	/* Deallocate all registered callbacks */
	for (i = 0; i < ctx->num_callbacks; i++)
		if (ctx->callbacks[i].uri_regex != NULL)
			free(ctx->callbacks[i].uri_regex);

	/* Deallocate all options */
	for (i = 0; i < NUM_OPTIONS; i++)
		if (ctx->options[i] != NULL)
			free(ctx->options[i]);

	/* Close log files */
	if (ctx->access_log)
		(void) fclose(ctx->access_log);
	if (ctx->error_log)
		(void) fclose(ctx->error_log);

	/* Deallocate SSL context */
	if (ctx->ssl_ctx)
		SSL_CTX_free(ctx->ssl_ctx);

	/* Deallocate mutexes and condvars */
	for (i = 0; i < NUM_OPTIONS; i++)
		(void) pthread_mutex_destroy(&ctx->opt_mutex[i]);

	(void) pthread_mutex_destroy(&ctx->thr_mutex);
	(void) pthread_mutex_destroy(&ctx->bind_mutex);
	(void) pthread_cond_destroy(&ctx->thr_cond);
	(void) pthread_cond_destroy(&ctx->empty_cond);
	(void) pthread_cond_destroy(&ctx->full_cond);

	/* Signal mg_stop() that we're done */
	ctx->stop_flag = 2;
}

#if !defined(_WIN32)
static bool_t
set_uid_option(struct mg_context *ctx, const char *uid)
{
	struct passwd	*pw;
	int		retval = FALSE;

	if ((pw = getpwnam(uid)) == NULL)
		cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
	else if (setgid(pw->pw_gid) == -1)
		cry(fc(ctx), "%s: setgid(%s): %s",
		    __func__, uid, strerror(errno));
	else if (setuid(pw->pw_uid) == -1)
		cry(fc(ctx), "%s: setuid(%s): %s",
		    __func__, uid, strerror(errno));
	else
		retval = TRUE;

	return (retval);
}
#endif /* !_WIN32 */

#if !defined(NO_SSL)
void
mg_set_ssl_password_callback(struct mg_context *ctx, mg_spcb_t func)
{
	ctx->ssl_password_callback = func;
}

static pthread_mutex_t *ssl_mutexes;

static void
ssl_locking_callback(int mode, int mutex_num, const char *file, int line)
{
	line = 0;	/* Unused */
	file = NULL;	/* Unused */

	if (mode & CRYPTO_LOCK)
		(void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);
	else
		(void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
}

static unsigned long
ssl_id_callback(void)
{
	return ((unsigned long) pthread_self());
}

static bool_t
load_dll(struct mg_context *ctx, const char *dll_name, struct ssl_func *sw)
{
	union {void *p; void (*fp)(void);} u;
	void		*dll_handle;
	struct ssl_func	*fp;

	if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
		cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
		return (FALSE);
	}

	for (fp = sw; fp->name != NULL; fp++) {
#ifdef _WIN32
		/* GetProcAddress() returns pointer to function */
		u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);
#else
		/*
		 * dlsym() on UNIX returns void *.
		 * ISO C forbids casts of data pointers to function
		 * pointers. We need to use a union to make a cast.
		 */
		u.p = dlsym(dll_handle, fp->name);
#endif /* _WIN32 */
		if (u.fp == NULL) {
			cry(fc(ctx), "%s: cannot find %s", __func__, fp->name);
			return (FALSE);
		} else {
			fp->ptr = u.fp;
		}
	}

	return (TRUE);
}

/*
 * Dynamically load SSL library. Set up ctx->ssl_ctx pointer.
 */
static bool_t
set_ssl_option(struct mg_context *ctx, const char *pem)
{
	SSL_CTX		*CTX;
	int		i, size, retval = FALSE;

	if (load_dll(ctx, SSL_LIB, ssl_sw) == FALSE ||
	    load_dll(ctx, CRYPTO_LIB, crypto_sw) == FALSE)
		return (FALSE);

	/* Initialize SSL crap */
	SSL_library_init();

	if ((CTX = SSL_CTX_new(SSLv23_server_method())) == NULL)
		cry(fc(ctx), "SSL_CTX_new error");
	else if (ctx->ssl_password_callback != NULL)
		SSL_CTX_set_default_passwd_cb(CTX, ctx->ssl_password_callback);

	if (CTX != NULL && SSL_CTX_use_certificate_file(
	    CTX, pem, SSL_FILETYPE_PEM) == 0)
		cry(fc(ctx), "%s: cannot open %s", __func__, pem);
	else if (CTX != NULL && SSL_CTX_use_PrivateKey_file(
	    CTX, pem, SSL_FILETYPE_PEM) == 0)
		cry(fc(ctx), "%s: cannot open %s", NULL, pem);
	else
		retval = TRUE;

	/*
	 * Initialize locking callbacks, needed for thread safety.
	 * http://www.openssl.org/support/faq.html#PROG1
	 */
	size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
	if ((ssl_mutexes = (pthread_mutex_t *) malloc(size)) == NULL) {
		cry(fc(ctx), "%s: cannot allocate mutexes", __func__);
		return (FALSE);
	}

	for (i = 0; i < CRYPTO_num_locks(); i++)
		pthread_mutex_init(&ssl_mutexes[i], NULL);

	CRYPTO_set_locking_callback(&ssl_locking_callback);
	CRYPTO_set_id_callback(&ssl_id_callback);

	/* Done with everything. Save the context. */
	ctx->ssl_ctx = CTX;

	return (retval);
}
#endif /* !NO_SSL */

static bool_t
open_log_file(struct mg_context *ctx, FILE **fpp, const char *path)
{
	bool_t	retval = TRUE;

	if (*fpp != NULL)
		(void) fclose(*fpp);

	if (path == NULL) {
		*fpp = NULL;
	} else if ((*fpp = mg_fopen(path, "a")) == NULL) {
		cry(fc(ctx), "%s(%s): %s", __func__, path, strerror(errno));
		retval = FALSE;
	} else {
		set_close_on_exec(fileno(*fpp));
	}

	return (retval);
}

static bool_t
set_alog_option(struct mg_context *ctx, const char *path)
{
	return (open_log_file(ctx, &ctx->access_log, path));
}

static bool_t
set_elog_option(struct mg_context *ctx, const char *path)
{
	return (open_log_file(ctx, &ctx->error_log, path));
}

static bool_t
set_gpass_option(struct mg_context *ctx, const char *path)
{
	struct mgstat	mgstat;
	ctx = NULL;
	return (mg_stat(path, &mgstat) == 0);
}

static bool_t
set_max_threads_option(struct mg_context *ctx, const char *str)
{
	ctx->max_threads = atoi(str);
	return (TRUE);
}

static bool_t
set_acl_option(struct mg_context *ctx, const char *acl)
{
	struct usa	fake;

	return (check_acl(ctx, acl, &fake) != -1);
}

static void admin_page(struct mg_connection *,
		const struct mg_request_info *, void *);
static bool_t
set_admin_uri_option(struct mg_context *ctx, const char *uri)
{
	mg_set_uri_callback(ctx, uri, &admin_page, NULL);
	return (TRUE);
}

/*
 * Check if the comma-separated list of options has a format of key-value
 * pairs: "k1=v1,k2=v2". Return FALSE if any entry has invalid key or value.
 */
static bool_t
set_kv_list_option(struct mg_context *ctx, const char *str)
{
	const char	*list;
	struct vec	key, value;

	list = str;
	while ((list = next_option(list, &key, &value)) != NULL)
		if (key.len == 0 || value.len == 0) {
			cry(fc(ctx), "Invalid list specified: [%s], "
			    "expecting key1=value1,key2=value2,...", str);
			return (FALSE);
		}

	return (TRUE);
}

static const struct mg_option known_options[] = {
	{"root", "\tWeb root directory", ".", OPT_ROOT, NULL},
	{"index_files",	"Index files", "index.html,index.htm,index.cgi",
		OPT_INDEX_FILES, NULL},
#if !defined(NO_SSL)
	{"ssl_cert", "SSL certificate file", NULL,
		OPT_SSL_CERTIFICATE, &set_ssl_option},
#endif /* !NO_SSL */
	{"ports", "Listening ports", NULL,
		OPT_PORTS, &set_ports_option},
	{"dir_list", "Directory listing", "yes",
		OPT_DIR_LIST, NULL},
	{"protect", "URI to htpasswd mapping", NULL,
		OPT_PROTECT, &set_kv_list_option},
#if !defined(NO_CGI)
	{"cgi_ext", "CGI extensions", ".cgi,.pl,.php",
		OPT_CGI_EXTENSIONS, NULL},
	{"cgi_interp", "CGI interpreter to use with all CGI scripts", NULL,
		OPT_CGI_INTERPRETER, NULL},
	{"cgi_env", "Custom CGI enviroment variables", NULL,
		OPT_CGI_ENV, &set_kv_list_option},
#endif /* NO_CGI */
	{"ssi_ext", "SSI extensions", ".shtml,.shtm",
		OPT_SSI_EXTENSIONS, NULL},
	{"auth_realm", "Authentication domain name", "mydomain.com",
		OPT_AUTH_DOMAIN, NULL},
	{"auth_gpass", "Global passwords file", NULL,
		OPT_AUTH_GPASSWD, &set_gpass_option},
	{"auth_PUT", "PUT,DELETE auth file", NULL,
		OPT_AUTH_PUT, NULL},
#if !defined(_WIN32)
	{"uid", "\tRun as user", NULL, OPT_UID, &set_uid_option},
#endif /* !_WIN32 */
	{"access_log", "Access log file", NULL,
		OPT_ACCESS_LOG, &set_alog_option},
	{"error_log", "Error log file", NULL,
		OPT_ERROR_LOG, &set_elog_option},
	{"aliases", "Path=URI mappings", NULL,
		OPT_ALIASES, &set_kv_list_option},
	{"admin_uri", "Administration page URI", NULL,
		OPT_ADMIN_URI, &set_admin_uri_option},
	{"acl", "\tAllow/deny IP addresses/subnets", NULL,
		OPT_ACL, &set_acl_option},
	{"max_threads", "Maximum simultaneous threads to spawn", "100",
		OPT_MAX_THREADS, &set_max_threads_option},
	{"idle_time", "Time in seconds connection stays idle", "10",
		OPT_IDLE_TIME, NULL},
	{"mime_types", "Comma separated list of ext=mime_type pairs", NULL,
		OPT_MIME_TYPES, &set_kv_list_option},
	{NULL, NULL, NULL, 0, NULL}
};

static const struct mg_option *
find_opt(const char *opt_name)
{
	int	i;

	for (i = 0; known_options[i].name != NULL; i++)
		if (!strcmp(opt_name, known_options[i].name))
			return (known_options + i);

	return (NULL);
}

int
mg_set_option(struct mg_context *ctx, const char *opt, const char *val)
{
	const struct mg_option	*option;
	int			i, retval;

	DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: [%s]->[%s]", __func__, opt, val));
	if (opt != NULL && (option = find_opt(opt)) != NULL) {
		i = (int) (option - known_options);
		lock_option(ctx, i);

		if (option->setter != NULL)
			retval = option->setter(ctx, val);
		else
			retval = TRUE;

		/* Free old value if any */
		if (ctx->options[option->index] != NULL)
			free(ctx->options[option->index]);

		/* Set new option value */
		ctx->options[option->index] = val ? mg_strdup(val) : NULL;
		unlock_option(ctx, i);

		if (retval == FALSE)
			cry(fc(ctx), "%s(%s): failure", __func__, opt);
	} else {
		cry(fc(ctx), "%s: No such option: [%s]", __func__, opt);
		retval = -1;
	}

	return (retval);
}

void
mg_show_usage_string(FILE *fp)
{
	const struct mg_option	*o;

	(void) fprintf(stderr,
	    "Mongoose version %s (c) Sergey Lyubka\n"
	    "usage: mongoose [options] [config_file]\n", mg_version());

	fprintf(fp, "  -A <htpasswd_file> <realm> <user> <passwd>\n");

	for (o = known_options; o->name != NULL; o++) {
		(void) fprintf(fp, "  -%s\t%s", o->name, o->description);
		if (o->default_value != NULL)
			fprintf(fp, " (default: \"%s\")", o->default_value);
		fputc('\n', fp);
	}
}

const char *
mg_get_option(const struct mg_context *ctx, const char *option_name)
{
	const struct mg_option	*option;

	if ((option = find_opt(option_name)) != NULL)
		return (ctx->options[option->index]);
	else
		return (NULL);
}

static void
admin_page(struct mg_connection *conn, const struct mg_request_info *ri,
			   void *user_data)
{
	const struct mg_option	*option;
	const char		*option_name, *option_value;

	user_data = NULL; /* Unused */

	(void) mg_printf(conn,
	"HTTP/1.1 200 OK\r\n"
			"Content-Type: text/html\r\n\r\n"
			"<html><body><h1>Mongoose v. %s</h1>", mg_version());

	if (!strcmp(ri->request_method, "POST")) {
		option_name = mg_get_var(conn, "o");
		option_value = mg_get_var(conn, "v");
		if (mg_set_option(conn->ctx,
		    option_name, option_value) == -1) {
			(void) mg_printf(conn,
			    "<p style=\"background: red\">Error setting "
			    "option \"%s\"</p>",
			    option_name ? option_name : "(null)");
		} else {
			(void) mg_printf(conn,
			    "<p style=\"color: green\">Saved: %s=%s</p>",
			    option_name, option_value ? option_value : "NULL");
		}
	}

	/* Print table with all options */
	(void) mg_printf(conn, "%s", "<table border=\"1\""
			"<tr><th>Option</th><th>Description</th>"
					"<th colspan=2>Value</th></tr>");

	for (option = known_options; option->name != NULL; option++) {
		option_value = mg_get_option(conn->ctx, option->name);
		if (option_value == NULL)
			option_value = "";
		(void) mg_printf(conn,
		    "<form method=post><tr><td>%s</td><td>%s</td>"
		    "<input type=hidden name=o value='%s'>"
		    "<td><input type=text name=v value='%s'></td>"
		    "<td><input type=submit value=save></td></form></tr>",
		    option->name, option->description,
		    option->name, option_value);
	}

	(void) mg_printf(conn, "%s", "</table></body></html>");
}

static void
reset_per_request_attributes(struct mg_connection *conn)
{
	if (conn->request_info.remote_user != NULL) {
		free((void *) conn->request_info.remote_user);
		conn->request_info.remote_user = NULL;
	}
	if (conn->free_post_data && conn->request_info.post_data != NULL) {
		free((void *) conn->request_info.post_data);
		conn->request_info.post_data = NULL;
	}
}

static void
close_socket_gracefully(struct mg_connection *conn, SOCKET sock)
{
	char	buf[BUFSIZ];
	int	n;

	/* Send FIN to the client */
	(void) shutdown(sock, SHUT_WR);
	set_non_blocking_mode(conn, sock);

	/*
	 * Read and discard pending data. If we do not do that and close the
	 * socket, the data in the send buffer may be discarded. This
	 * behaviour is seen on Windows, when client keeps sending data
	 * when server decide to close the connection; then when client
	 * does recv() it gets no data back.
	 */
	do {
		n = pull(NULL, sock, NULL, buf, sizeof(buf));
	} while (n > 0);

	/* Now we know that our FIN is ACK-ed, safe to close */
	(void) closesocket(sock);
}

static void
close_connection(struct mg_connection *conn)
{
	reset_per_request_attributes(conn);

	if (conn->ssl)
		SSL_free(conn->ssl);

	if (conn->client.sock != INVALID_SOCKET)
		close_socket_gracefully(conn, conn->client.sock);
}

static void
reset_connection_attributes(struct mg_connection *conn)
{
	reset_per_request_attributes(conn);
	conn->free_post_data = FALSE;
	conn->request_info.status_code = -1;
	conn->num_bytes_sent = 0;
	(void) memset(&conn->request_info, 0, sizeof(conn->request_info));
}

static void
shift_to_next(struct mg_connection *conn, char *buf, int req_len, int *nread)
{
	int64_t	cl;
	int	over_len, body_len;

	cl = get_content_length(conn);
	over_len = *nread - req_len;
	assert(over_len >= 0);

	if (cl == -1) {
		body_len = 0;
	} else if (cl < (int64_t) over_len) {
		body_len = (int) cl;
	} else {
		body_len = over_len;
	}

	*nread -= req_len + body_len;
	(void) memmove(buf, buf + req_len + body_len, *nread);
}

static void
process_new_connection(struct mg_connection *conn)
{
	struct mg_request_info *ri = &conn->request_info;
	char	buf[MAX_REQUEST_SIZE];
	int	request_len, nread;

	nread = 0;
	reset_connection_attributes(conn);

	/* If next request is not pipelined, read it in */
	if ((request_len = get_request_len(buf, (size_t) nread)) == 0)
		request_len = read_request(NULL, conn->client.sock,
		    conn->ssl, buf, sizeof(buf), &nread);
	assert(nread >= request_len);

	if (request_len <= 0)
		return;	/* Remote end closed the connection */

	/* 0-terminate the request: parse_request uses sscanf */
	buf[request_len - 1] = '\0';

	if (parse_http_request(buf, ri, &conn->client.rsa)) {
		if (strcmp(ri->http_version, "1.0") != 0 &&
		    strcmp(ri->http_version, "1.1") != 0) {
			send_error(conn, 505,
			    "HTTP version not supported",
			    "%s", "Weird HTTP version");
			log_access(conn);
		} else {
			ri->post_data = buf + request_len;
			ri->post_data_len = nread - request_len;
			conn->birth_time = time(NULL);
			analyze_request(conn);
			log_access(conn);
			shift_to_next(conn, buf, request_len, &nread);
		}
	} else {
		/* Do not put garbage in the access log */
		send_error(conn, 400, "Bad Request",
		    "Can not parse request: [%.*s]", nread, buf);
	}

}

/*
 * Worker threads take accepted socket from the queue
 */
static bool_t
get_socket(struct mg_context *ctx, struct socket *sp)
{
	struct timespec	ts;

	(void) pthread_mutex_lock(&ctx->thr_mutex);
	DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: thread %p: going idle",
	    __func__, (void *) pthread_self()));

	/* If the queue is empty, wait. We're idle at this point. */
	ctx->num_idle++;
	while (ctx->sq_head == ctx->sq_tail) {
		ts.tv_nsec = 0;
		ts.tv_sec = time(NULL) + atoi(ctx->options[OPT_IDLE_TIME]) + 1;
		if (pthread_cond_timedwait(&ctx->empty_cond,
		    &ctx->thr_mutex, &ts) != 0) {
			/* Timeout! release the mutex and return */
			(void) pthread_mutex_unlock(&ctx->thr_mutex);
			return (FALSE);
		}
	}
	assert(ctx->sq_head > ctx->sq_tail);

	/* We're going busy now: got a socket to process! */
	ctx->num_idle--;

	/* Copy socket from the queue and increment tail */
	*sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
	ctx->sq_tail++;
	DEBUG_TRACE((DEBUG_MGS_PREFIX
	    "%s: thread %p grabbed socket %d, going busy",
	    __func__, (void *) pthread_self(), sp->sock));

	/* Wrap pointers if needed */
	while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
		ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
		ctx->sq_head -= ARRAY_SIZE(ctx->queue);
	}

	pthread_cond_signal(&ctx->full_cond);
	(void) pthread_mutex_unlock(&ctx->thr_mutex);

	return (TRUE);
}

static void
worker_thread(struct mg_context *ctx)
{
	struct mg_connection	conn;

	DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: thread %p starting",
	    __func__, (void *) pthread_self()));

	(void) memset(&conn, 0, sizeof(conn));

	while (get_socket(ctx, &conn.client) == TRUE) {
		conn.birth_time = time(NULL);
		conn.ctx = ctx;

		if (conn.client.is_ssl &&
		    (conn.ssl = SSL_new(conn.ctx->ssl_ctx)) == NULL) {
			cry(&conn, "%s: SSL_new: %d", __func__, ERRNO);
		} else if (conn.client.is_ssl &&
		    SSL_set_fd(conn.ssl, conn.client.sock) != 1) {
			cry(&conn, "%s: SSL_set_fd: %d", __func__, ERRNO);
		} else if (conn.client.is_ssl && SSL_accept(conn.ssl) != 1) {
			cry(&conn, "%s: SSL handshake error", __func__);
		} else {
			process_new_connection(&conn);
		}

		close_connection(&conn);
	}

	/* Signal master that we're done with connection and exiting */
	pthread_mutex_lock(&ctx->thr_mutex);
	ctx->num_threads--;
	ctx->num_idle--;
	pthread_cond_signal(&ctx->thr_cond);
	assert(ctx->num_threads >= 0);
	pthread_mutex_unlock(&ctx->thr_mutex);

	DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: thread %p exiting",
	    __func__, (void *) pthread_self()));
}

/*
 * Master thread adds accepted socket to a queue
 */
static void
put_socket(struct mg_context *ctx, const struct socket *sp)
{
	(void) pthread_mutex_lock(&ctx->thr_mutex);

	/* If the queue is full, wait */
	while (ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue))
		(void) pthread_cond_wait(&ctx->full_cond, &ctx->thr_mutex);
	assert(ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue));

	/* Copy socket to the queue and increment head */
	ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
	ctx->sq_head++;
	DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: queued socket %d",
	    __func__, sp->sock));

	/* If there are no idle threads, start one */
	if (ctx->num_idle == 0 && ctx->num_threads < ctx->max_threads) {
		if (start_thread(ctx,
		    (mg_thread_func_t) worker_thread, ctx) != 0)
			cry(fc(ctx), "Cannot start thread: %d", ERRNO);
		else
			ctx->num_threads++;
	}

	pthread_cond_signal(&ctx->empty_cond);
	(void) pthread_mutex_unlock(&ctx->thr_mutex);
}

static void
accept_new_connection(const struct socket *listener, struct mg_context *ctx)
{
	struct socket	accepted;

	accepted.rsa.len = sizeof(accepted.rsa.u.sin);
	accepted.lsa = listener->lsa;
	if ((accepted.sock = accept(listener->sock,
	    &accepted.rsa.u.sa, &accepted.rsa.len)) == INVALID_SOCKET)
		return;

	lock_option(ctx, OPT_ACL);
	if (ctx->options[OPT_ACL] != NULL &&
	    !check_acl(ctx, ctx->options[OPT_ACL], &accepted.rsa)) {
		cry(fc(ctx), "%s: %s is not allowed to connect",
		    __func__, inet_ntoa(accepted.rsa.u.sin.sin_addr));
		(void) closesocket(accepted.sock);
		unlock_option(ctx, OPT_ACL);
		return;
	}
	unlock_option(ctx, OPT_ACL);

	/* Put accepted socket structure into the queue */
	DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: accepted socket %d",
	    __func__, accepted.sock));
	accepted.is_ssl = listener->is_ssl;
	put_socket(ctx, &accepted);
}

static void
master_thread(struct mg_context *ctx)
{
	fd_set		read_set;
	struct timeval	tv;
	int		i, max_fd;

	while (ctx->stop_flag == 0) {
		FD_ZERO(&read_set);
		max_fd = -1;

		/* Add listening sockets to the read set */
		lock_option(ctx, OPT_PORTS);
		for (i = 0; i < ctx->num_listeners; i++)
			add_to_set(ctx->listeners[i].sock, &read_set, &max_fd);
		unlock_option(ctx, OPT_PORTS);

		tv.tv_sec = 1;
		tv.tv_usec = 0;

		if (select(max_fd + 1, &read_set, NULL, NULL, &tv) < 0) {
#ifdef _WIN32
			/*
			 * On windows, if read_set and write_set are empty,
			 * select() returns "Invalid parameter" error
			 * (at least on my Windows XP Pro). So in this case,
			 * we sleep here.
			 */
			sleep(1);
#endif /* _WIN32 */
		} else {
			lock_option(ctx, OPT_PORTS);
			for (i = 0; i < ctx->num_listeners; i++)
				if (FD_ISSET(ctx->listeners[i].sock, &read_set))
					accept_new_connection(
					    ctx->listeners + i, ctx);
			unlock_option(ctx, OPT_PORTS);
		}
	}

	/* Stop signal received: somebody called mg_stop. Quit. */
	mg_fini(ctx);
}

void
mg_stop(struct mg_context *ctx)
{
	ctx->stop_flag = 1;

	/* Wait until mg_fini() stops */
	while (ctx->stop_flag != 2)
		(void) sleep(1);

	assert(ctx->num_threads == 0);
	free(ctx);

#if defined(_WIN32)
	(void) WSACleanup();
#endif /* _WIN32 */
}

struct mg_context *
mg_start(void)
{
	struct mg_context	*ctx;
	const struct mg_option	*option;
	int			i;

#if defined(_WIN32)
	WSADATA data;
	WSAStartup(MAKEWORD(2,2), &data);
#endif /* _WIN32 */

	if ((ctx = (struct mg_context *) calloc(1, sizeof(*ctx))) == NULL) {
		cry(fc(ctx), "cannot allocate mongoose context");
		return (NULL);
	}

	ctx->error_log = stderr;
	mg_set_log_callback(ctx, builtin_error_log);

	/* Initialize options. First pass: set default option values */
	for (option = known_options; option->name != NULL; option++)
		ctx->options[option->index] = option->default_value == NULL ?
			NULL : mg_strdup(option->default_value);

	/* Call setter functions */
	for (option = known_options; option->name != NULL; option++)
		if (option->setter != NULL &&
		    ctx->options[option->index] != NULL)
			if (option->setter(ctx,
			    ctx->options[option->index]) == FALSE) {
				mg_fini(ctx);
				return (NULL);
			}

	DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: root [%s]",
	    __func__, ctx->options[OPT_ROOT]));

#if !defined(_WIN32)
	/*
	 * Ignore SIGPIPE signal, so if browser cancels the request, it
	 * won't kill the whole process.
	 */
	(void) signal(SIGPIPE, SIG_IGN);
#endif /* _WIN32 */

	/* Initialize options mutexes */
	for (i = 0; i < NUM_OPTIONS; i++)
		(void) pthread_mutex_init(&ctx->opt_mutex[i], NULL);

	(void) pthread_mutex_init(&ctx->thr_mutex, NULL);
	(void) pthread_mutex_init(&ctx->bind_mutex, NULL);
	(void) pthread_cond_init(&ctx->thr_cond, NULL);
	(void) pthread_cond_init(&ctx->empty_cond, NULL);
	(void) pthread_cond_init(&ctx->full_cond, NULL);

	/* Start master (listening) thread */
	start_thread(ctx, (mg_thread_func_t) master_thread, ctx);

	return (ctx);
}