aboutsummaryrefslogtreecommitdiff
path: root/lib/http.c
blob: 9523da38f158f44d4f7966ee1f000f67d91afb0e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
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
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at http://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * $Id$
 ***************************************************************************/

#include "setup.h"

#ifndef CURL_DISABLE_HTTP
/* -- WIN32 approved -- */
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <ctype.h>

#ifdef WIN32
#include <time.h>
#include <io.h>
#else
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif

#ifdef HAVE_TIME_H
#ifdef TIME_WITH_SYS_TIME
#include <time.h>
#endif
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif

#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif

#endif

#include "urldata.h"
#include <curl/curl.h>
#include "transfer.h"
#include "sendf.h"
#include "easyif.h" /* for Curl_convert_... prototypes */
#include "formdata.h"
#include "progress.h"
#include "curl_base64.h"
#include "cookie.h"
#include "strequal.h"
#include "sslgen.h"
#include "http_digest.h"
#include "http_ntlm.h"
#include "http_negotiate.h"
#include "url.h"
#include "share.h"
#include "hostip.h"
#include "http.h"
#include "curl_memory.h"
#include "select.h"
#include "parsedate.h" /* for the week day and month names */
#include "strtoofft.h"
#include "multiif.h"
#include "rawstr.h"
#include "content_encoding.h"

#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>

/* The last #include file should be: */
#include "memdebug.h"

/* Default proxy timeout in milliseconds */
#define PROXY_TIMEOUT (3600*1000)

/*
 * Forward declarations.
 */

static int http_getsock_do(struct connectdata *conn,
                           curl_socket_t *socks,
                           int numsocks);
#ifdef USE_SSL
static CURLcode https_connecting(struct connectdata *conn, bool *done);
static int https_getsock(struct connectdata *conn,
                         curl_socket_t *socks,
                         int numsocks);
#else
#define https_connecting(x,y) CURLE_COULDNT_CONNECT
#endif

/*
 * HTTP handler interface.
 */
const struct Curl_handler Curl_handler_http = {
  "HTTP",                               /* scheme */
  ZERO_NULL,                            /* setup_connection */
  Curl_http,                            /* do_it */
  Curl_http_done,                       /* done */
  ZERO_NULL,                            /* do_more */
  Curl_http_connect,                    /* connect_it */
  ZERO_NULL,                            /* connecting */
  ZERO_NULL,                            /* doing */
  ZERO_NULL,                            /* proto_getsock */
  http_getsock_do,                      /* doing_getsock */
  ZERO_NULL,                            /* perform_getsock */
  ZERO_NULL,                            /* disconnect */
  PORT_HTTP,                            /* defport */
  PROT_HTTP,                            /* protocol */
};

#ifdef USE_SSL
/*
 * HTTPS handler interface.
 */
const struct Curl_handler Curl_handler_https = {
  "HTTPS",                              /* scheme */
  ZERO_NULL,                            /* setup_connection */
  Curl_http,                            /* do_it */
  Curl_http_done,                       /* done */
  ZERO_NULL,                            /* do_more */
  Curl_http_connect,                    /* connect_it */
  https_connecting,                     /* connecting */
  ZERO_NULL,                            /* doing */
  https_getsock,                        /* proto_getsock */
  http_getsock_do,                      /* doing_getsock */
  ZERO_NULL,                            /* perform_getsock */
  ZERO_NULL,                            /* disconnect */
  PORT_HTTPS,                           /* defport */
  PROT_HTTP | PROT_HTTPS | PROT_SSL     /* protocol */
};
#endif


/*
 * checkheaders() checks the linked list of custom HTTP headers for a
 * particular header (prefix).
 *
 * Returns a pointer to the first matching header or NULL if none matched.
 */
static char *checkheaders(struct SessionHandle *data, const char *thisheader)
{
  struct curl_slist *head;
  size_t thislen = strlen(thisheader);

  for(head = data->set.headers; head; head=head->next) {
    if(Curl_raw_nequal(head->data, thisheader, thislen))
      return head->data;
  }
  return NULL;
}

/*
 * Strip off leading and trailing whitespace from the value in the
 * given HTTP header line and return a strdupped copy. Returns NULL in
 * case of allocation failure. Returns an empty string if the header value
 * consists entirely of whitespace.
 */
char *Curl_copy_header_value(const char *h)
{
  const char *start;
  const char *end;
  char *value;
  size_t len;

  DEBUGASSERT(h);

  /* Find the end of the header name */
  while (*h && (*h != ':'))
    ++h;

  if (*h)
    /* Skip over colon */
    ++h;

  /* Find the first non-space letter */
  start = h;
  while(*start && ISSPACE(*start))
    start++;

  /* data is in the host encoding so
     use '\r' and '\n' instead of 0x0d and 0x0a */
  end = strchr(start, '\r');
  if(!end)
    end = strchr(start, '\n');
  if(!end)
    end = strchr(start, '\0');
  if(!end)
    return NULL;

  /* skip all trailing space letters */
  while((end > start) && ISSPACE(*end))
    end--;

  /* get length of the type */
  len = end-start+1;

  value = malloc(len + 1);
  if(!value)
    return NULL;

  memcpy(value, start, len);
  value[len] = 0; /* zero terminate */

  return value;
}

/*
 * http_output_basic() sets up an Authorization: header (or the proxy version)
 * for HTTP Basic authentication.
 *
 * Returns CURLcode.
 */
static CURLcode http_output_basic(struct connectdata *conn, bool proxy)
{
  char *authorization;
  struct SessionHandle *data=conn->data;
  char **userp;
  const char *user;
  const char *pwd;

  if(proxy) {
    userp = &conn->allocptr.proxyuserpwd;
    user = conn->proxyuser;
    pwd = conn->proxypasswd;
  }
  else {
    userp = &conn->allocptr.userpwd;
    user = conn->user;
    pwd = conn->passwd;
  }

  snprintf(data->state.buffer, sizeof(data->state.buffer), "%s:%s", user, pwd);
  if(Curl_base64_encode(data, data->state.buffer,
                        strlen(data->state.buffer),
                        &authorization) > 0) {
    if(*userp)
      free(*userp);
    *userp = aprintf( "%sAuthorization: Basic %s\r\n",
                      proxy?"Proxy-":"",
                      authorization);
    free(authorization);
    if(!*userp)
      return CURLE_OUT_OF_MEMORY;
  }
  else
    return CURLE_OUT_OF_MEMORY;
  return CURLE_OK;
}

/* pickoneauth() selects the most favourable authentication method from the
 * ones available and the ones we want.
 *
 * return TRUE if one was picked
 */
static bool pickoneauth(struct auth *pick)
{
  bool picked;
  /* only deal with authentication we want */
  long avail = pick->avail & pick->want;
  picked = TRUE;

  /* The order of these checks is highly relevant, as this will be the order
     of preference in case of the existence of multiple accepted types. */
  if(avail & CURLAUTH_GSSNEGOTIATE)
    pick->picked = CURLAUTH_GSSNEGOTIATE;
  else if(avail & CURLAUTH_DIGEST)
    pick->picked = CURLAUTH_DIGEST;
  else if(avail & CURLAUTH_NTLM)
    pick->picked = CURLAUTH_NTLM;
  else if(avail & CURLAUTH_BASIC)
    pick->picked = CURLAUTH_BASIC;
  else {
    pick->picked = CURLAUTH_PICKNONE; /* we select to use nothing */
    picked = FALSE;
  }
  pick->avail = CURLAUTH_NONE; /* clear it here */

  return picked;
}

/*
 * Curl_http_perhapsrewind()
 *
 * If we are doing POST or PUT {
 *   If we have more data to send {
 *     If we are doing NTLM {
 *       Keep sending since we must not disconnect
 *     }
 *     else {
 *       If there is more than just a little data left to send, close
 *       the current connection by force.
 *     }
 *   }
 *   If we have sent any data {
 *     If we don't have track of all the data {
 *       call app to tell it to rewind
 *     }
 *     else {
 *       rewind internally so that the operation can restart fine
 *     }
 *   }
 * }
 */
CURLcode Curl_http_perhapsrewind(struct connectdata *conn)
{
  struct SessionHandle *data = conn->data;
  struct HTTP *http = data->state.proto.http;
  curl_off_t bytessent;
  curl_off_t expectsend = -1; /* default is unknown */

  if(!http || !(conn->protocol & PROT_HTTP))
    /* If this is still NULL, we have not reach very far and we can
       safely skip this rewinding stuff, or this is attempted to get used
       when HTTP isn't activated */
    return CURLE_OK;

  switch(data->set.httpreq) {
  case HTTPREQ_GET:
  case HTTPREQ_HEAD:
    return CURLE_OK;
  default:
    break;
  }

  bytessent = http->writebytecount;

  if(conn->bits.authneg)
    /* This is a state where we are known to be negotiating and we don't send
       any data then. */
    expectsend = 0;
  else {
    /* figure out how much data we are expected to send */
    switch(data->set.httpreq) {
    case HTTPREQ_POST:
      if(data->set.postfieldsize != -1)
        expectsend = data->set.postfieldsize;
      else if(data->set.postfields)
        expectsend = (curl_off_t)strlen(data->set.postfields);
      break;
    case HTTPREQ_PUT:
      if(data->set.infilesize != -1)
        expectsend = data->set.infilesize;
      break;
    case HTTPREQ_POST_FORM:
      expectsend = http->postsize;
      break;
    default:
      break;
    }
  }

  conn->bits.rewindaftersend = FALSE; /* default */

  if((expectsend == -1) || (expectsend > bytessent)) {
    /* There is still data left to send */
    if((data->state.authproxy.picked == CURLAUTH_NTLM) ||
       (data->state.authhost.picked == CURLAUTH_NTLM)) {
      if(((expectsend - bytessent) < 2000) ||
         (conn->ntlm.state != NTLMSTATE_NONE)) {
        /* The NTLM-negotiation has started *OR* there is just a little (<2K)
           data left to send, keep on sending. */

        /* rewind data when completely done sending! */
        if(!conn->bits.authneg)
          conn->bits.rewindaftersend = TRUE;

        return CURLE_OK;
      }
      if(conn->bits.close)
        /* this is already marked to get closed */
        return CURLE_OK;

      infof(data, "NTLM send, close instead of sending %" FORMAT_OFF_T
            " bytes\n", (curl_off_t)(expectsend - bytessent));
    }

    /* This is not NTLM or NTLM with many bytes left to send: close
     */
    conn->bits.close = TRUE;
    data->req.size = 0; /* don't download any more than 0 bytes */

    /* There still is data left to send, but this connection is marked for
       closure so we can safely do the rewind right now */
  }

  if(bytessent)
    /* we rewind now at once since if we already sent something */
    return Curl_readrewind(conn);

  return CURLE_OK;
}

/*
 * Curl_http_auth_act() gets called when all HTTP headers have been received
 * and it checks what authentication methods that are available and decides
 * which one (if any) to use. It will set 'newurl' if an auth method was
 * picked.
 */

CURLcode Curl_http_auth_act(struct connectdata *conn)
{
  struct SessionHandle *data = conn->data;
  bool pickhost = FALSE;
  bool pickproxy = FALSE;
  CURLcode code = CURLE_OK;

  if(100 <= data->req.httpcode && 199 >= data->req.httpcode)
    /* this is a transient response code, ignore */
    return CURLE_OK;

  if(data->state.authproblem)
    return data->set.http_fail_on_error?CURLE_HTTP_RETURNED_ERROR:CURLE_OK;

  if(conn->bits.user_passwd &&
     ((data->req.httpcode == 401) ||
      (conn->bits.authneg && data->req.httpcode < 300))) {
    pickhost = pickoneauth(&data->state.authhost);
    if(!pickhost)
      data->state.authproblem = TRUE;
  }
  if(conn->bits.proxy_user_passwd &&
     ((data->req.httpcode == 407) ||
      (conn->bits.authneg && data->req.httpcode < 300))) {
    pickproxy = pickoneauth(&data->state.authproxy);
    if(!pickproxy)
      data->state.authproblem = TRUE;
  }

  if(pickhost || pickproxy) {
    /* In case this is GSS auth, the newurl field is already allocated so
       we must make sure to free it before allocating a new one. As figured
       out in bug #2284386 */
    Curl_safefree(data->req.newurl);
    data->req.newurl = strdup(data->change.url); /* clone URL */
    if(!data->req.newurl)
      return CURLE_OUT_OF_MEMORY;

    if((data->set.httpreq != HTTPREQ_GET) &&
       (data->set.httpreq != HTTPREQ_HEAD) &&
       !conn->bits.rewindaftersend) {
      code = Curl_http_perhapsrewind(conn);
      if(code)
        return code;
    }
  }

  else if((data->req.httpcode < 300) &&
          (!data->state.authhost.done) &&
          conn->bits.authneg) {
    /* no (known) authentication available,
       authentication is not "done" yet and
       no authentication seems to be required and
       we didn't try HEAD or GET */
    if((data->set.httpreq != HTTPREQ_GET) &&
       (data->set.httpreq != HTTPREQ_HEAD)) {
      data->req.newurl = strdup(data->change.url); /* clone URL */
      if(!data->req.newurl)
        return CURLE_OUT_OF_MEMORY;
      data->state.authhost.done = TRUE;
    }
  }
  if(Curl_http_should_fail(conn)) {
    failf (data, "The requested URL returned error: %d",
           data->req.httpcode);
    code = CURLE_HTTP_RETURNED_ERROR;
  }

  return code;
}


/*
 * Output the correct authentication header depending on the auth type
 * and whether or not it is to a proxy.
 */
static CURLcode
output_auth_headers(struct connectdata *conn,
                    struct auth *authstatus,
                    const char *request,
                    const char *path,
                    bool proxy)
{
  struct SessionHandle *data = conn->data;
  const char *auth=NULL;
  CURLcode result = CURLE_OK;
#ifdef HAVE_GSSAPI
  struct negotiatedata *negdata = proxy?
    &data->state.proxyneg:&data->state.negotiate;
#endif

#ifdef CURL_DISABLE_CRYPTO_AUTH
  (void)request;
  (void)path;
#endif

#ifdef HAVE_GSSAPI
  if((authstatus->picked == CURLAUTH_GSSNEGOTIATE) &&
     negdata->context && !GSS_ERROR(negdata->status)) {
    auth="GSS-Negotiate";
    result = Curl_output_negotiate(conn, proxy);
    if(result)
      return result;
    authstatus->done = TRUE;
    negdata->state = GSS_AUTHSENT;
  }
  else
#endif
#ifdef USE_NTLM
  if(authstatus->picked == CURLAUTH_NTLM) {
    auth="NTLM";
    result = Curl_output_ntlm(conn, proxy);
    if(result)
      return result;
  }
  else
#endif
#ifndef CURL_DISABLE_CRYPTO_AUTH
  if(authstatus->picked == CURLAUTH_DIGEST) {
    auth="Digest";
    result = Curl_output_digest(conn,
                                proxy,
                                (const unsigned char *)request,
                                (const unsigned char *)path);
    if(result)
      return result;
  }
  else
#endif
  if(authstatus->picked == CURLAUTH_BASIC) {
    /* Basic */
    if((proxy && conn->bits.proxy_user_passwd &&
       !checkheaders(data, "Proxy-authorization:")) ||
       (!proxy && conn->bits.user_passwd &&
       !checkheaders(data, "Authorization:"))) {
      auth="Basic";
      result = http_output_basic(conn, proxy);
      if(result)
        return result;
    }
    /* NOTE: this function should set 'done' TRUE, as the other auth
       functions work that way */
    authstatus->done = TRUE;
  }

  if(auth) {
    infof(data, "%s auth using %s with user '%s'\n",
          proxy?"Proxy":"Server", auth,
          proxy?(conn->proxyuser?conn->proxyuser:""):
                (conn->user?conn->user:""));
    authstatus->multi = (bool)(!authstatus->done);
  }
  else
    authstatus->multi = FALSE;

  return CURLE_OK;
}

/**
 * Curl_http_output_auth() setups the authentication headers for the
 * host/proxy and the correct authentication
 * method. conn->data->state.authdone is set to TRUE when authentication is
 * done.
 *
 * @param conn all information about the current connection
 * @param request pointer to the request keyword
 * @param path pointer to the requested path
 * @param proxytunnel boolean if this is the request setting up a "proxy
 * tunnel"
 *
 * @returns CURLcode
 */
static CURLcode
http_output_auth(struct connectdata *conn,
                 const char *request,
                 const char *path,
                 bool proxytunnel) /* TRUE if this is the request setting
                                      up the proxy tunnel */
{
  CURLcode result = CURLE_OK;
  struct SessionHandle *data = conn->data;
  struct auth *authhost;
  struct auth *authproxy;

  DEBUGASSERT(data);

  authhost = &data->state.authhost;
  authproxy = &data->state.authproxy;

  if((conn->bits.httpproxy && conn->bits.proxy_user_passwd) ||
     conn->bits.user_passwd)
    /* continue please */ ;
  else {
    authhost->done = TRUE;
    authproxy->done = TRUE;
    return CURLE_OK; /* no authentication with no user or password */
  }

  if(authhost->want && !authhost->picked)
    /* The app has selected one or more methods, but none has been picked
       so far by a server round-trip. Then we set the picked one to the
       want one, and if this is one single bit it'll be used instantly. */
    authhost->picked = authhost->want;

  if(authproxy->want && !authproxy->picked)
    /* The app has selected one or more methods, but none has been picked so
       far by a proxy round-trip. Then we set the picked one to the want one,
       and if this is one single bit it'll be used instantly. */
    authproxy->picked = authproxy->want;

#ifndef CURL_DISABLE_PROXY
  /* Send proxy authentication header if needed */
  if(conn->bits.httpproxy &&
      (conn->bits.tunnel_proxy == proxytunnel)) {
    result = output_auth_headers(conn, authproxy, request, path, TRUE);
    if(result)
      return result;
  }
  else
#else
  (void)proxytunnel;
#endif /* CURL_DISABLE_PROXY */
    /* we have no proxy so let's pretend we're done authenticating
       with it */
    authproxy->done = TRUE;

  /* To prevent the user+password to get sent to other than the original
     host due to a location-follow, we do some weirdo checks here */
  if(!data->state.this_is_a_follow ||
     conn->bits.netrc ||
     !data->state.first_host ||
     data->set.http_disable_hostname_check_before_authentication ||
     Curl_raw_equal(data->state.first_host, conn->host.name)) {
    result = output_auth_headers(conn, authhost, request, path, FALSE);
  }
  else
    authhost->done = TRUE;

  return result;
}


/*
 * Curl_http_input_auth() deals with Proxy-Authenticate: and WWW-Authenticate:
 * headers. They are dealt with both in the transfer.c main loop and in the
 * proxy CONNECT loop.
 */

CURLcode Curl_http_input_auth(struct connectdata *conn,
                              int httpcode,
                              const char *header) /* the first non-space */
{
  /*
   * This resource requires authentication
   */
  struct SessionHandle *data = conn->data;

  long *availp;
  const char *start;
  struct auth *authp;

  if(httpcode == 407) {
    start = header+strlen("Proxy-authenticate:");
    availp = &data->info.proxyauthavail;
    authp = &data->state.authproxy;
  }
  else {
    start = header+strlen("WWW-Authenticate:");
    availp = &data->info.httpauthavail;
    authp = &data->state.authhost;
  }

  /* pass all white spaces */
  while(*start && ISSPACE(*start))
    start++;

  /*
   * Here we check if we want the specific single authentication (using ==) and
   * if we do, we initiate usage of it.
   *
   * If the provided authentication is wanted as one out of several accepted
   * types (using &), we OR this authentication type to the authavail
   * variable.
   *
   * Note:
   *
   * ->picked is first set to the 'want' value (one or more bits) before the
   * request is sent, and then it is again set _after_ all response 401/407
   * headers have been received but then only to a single preferred method
   * (bit).
   *
   */

#ifdef HAVE_GSSAPI
  if(checkprefix("GSS-Negotiate", start) ||
      checkprefix("Negotiate", start)) {
    int neg;
    *availp |= CURLAUTH_GSSNEGOTIATE;
    authp->avail |= CURLAUTH_GSSNEGOTIATE;

    if(data->state.negotiate.state == GSS_AUTHSENT) {
      /* if we sent GSS authentication in the outgoing request and we get this
         back, we're in trouble */
      infof(data, "Authentication problem. Ignoring this.\n");
      data->state.authproblem = TRUE;
    }
    else {
      neg = Curl_input_negotiate(conn, (bool)(httpcode == 407), start);
      if(neg == 0) {
        DEBUGASSERT(!data->req.newurl);
        data->req.newurl = strdup(data->change.url);
        if(!data->req.newurl)
          return CURLE_OUT_OF_MEMORY;
        data->state.authproblem = FALSE;
        /* we received GSS auth info and we dealt with it fine */
        data->state.negotiate.state = GSS_AUTHRECV;
      }
    }
  }
  else
#endif
#ifdef USE_NTLM
    /* NTLM support requires the SSL crypto libs */
    if(checkprefix("NTLM", start)) {
      *availp |= CURLAUTH_NTLM;
      authp->avail |= CURLAUTH_NTLM;
      if(authp->picked == CURLAUTH_NTLM) {
        /* NTLM authentication is picked and activated */
        CURLntlm ntlm =
          Curl_input_ntlm(conn, (bool)(httpcode == 407), start);

        if(CURLNTLM_BAD != ntlm)
          data->state.authproblem = FALSE;
        else {
          infof(data, "Authentication problem. Ignoring this.\n");
          data->state.authproblem = TRUE;
        }
      }
    }
    else
#endif
#ifndef CURL_DISABLE_CRYPTO_AUTH
      if(checkprefix("Digest", start)) {
        if((authp->avail & CURLAUTH_DIGEST) != 0) {
          infof(data, "Ignoring duplicate digest auth header.\n");
        }
        else {
          CURLdigest dig;
          *availp |= CURLAUTH_DIGEST;
          authp->avail |= CURLAUTH_DIGEST;

          /* We call this function on input Digest headers even if Digest
           * authentication isn't activated yet, as we need to store the
           * incoming data from this header in case we are gonna use Digest. */
          dig = Curl_input_digest(conn, (bool)(httpcode == 407), start);

          if(CURLDIGEST_FINE != dig) {
            infof(data, "Authentication problem. Ignoring this.\n");
            data->state.authproblem = TRUE;
          }
        }
      }
      else
#endif
      if(checkprefix("Basic", start)) {
        *availp |= CURLAUTH_BASIC;
        authp->avail |= CURLAUTH_BASIC;
        if(authp->picked == CURLAUTH_BASIC) {
          /* We asked for Basic authentication but got a 40X back
             anyway, which basically means our name+password isn't
             valid. */
          authp->avail = CURLAUTH_NONE;
          infof(data, "Authentication problem. Ignoring this.\n");
          data->state.authproblem = TRUE;
        }
      }

  return CURLE_OK;
}

/**
 * Curl_http_should_fail() determines whether an HTTP response has gotten us
 * into an error state or not.
 *
 * @param conn all information about the current connection
 *
 * @retval 0 communications should continue
 *
 * @retval 1 communications should not continue
 */
int Curl_http_should_fail(struct connectdata *conn)
{
  struct SessionHandle *data;
  int httpcode;

  DEBUGASSERT(conn);
  data = conn->data;
  DEBUGASSERT(data);

  httpcode = data->req.httpcode;

  /*
  ** If we haven't been asked to fail on error,
  ** don't fail.
  */
  if(!data->set.http_fail_on_error)
    return 0;

  /*
  ** Any code < 400 is never terminal.
  */
  if(httpcode < 400)
    return 0;

  if(data->state.resume_from &&
     (data->set.httpreq==HTTPREQ_GET) &&
     (httpcode == 416)) {
    /* "Requested Range Not Satisfiable", just proceed and
       pretend this is no error */
    return 0;
  }

  /*
  ** Any code >= 400 that's not 401 or 407 is always
  ** a terminal error
  */
  if((httpcode != 401) &&
      (httpcode != 407))
    return 1;

  /*
  ** All we have left to deal with is 401 and 407
  */
  DEBUGASSERT((httpcode == 401) || (httpcode == 407));

  /*
  ** Examine the current authentication state to see if this
  ** is an error.  The idea is for this function to get
  ** called after processing all the headers in a response
  ** message.  So, if we've been to asked to authenticate a
  ** particular stage, and we've done it, we're OK.  But, if
  ** we're already completely authenticated, it's not OK to
  ** get another 401 or 407.
  **
  ** It is possible for authentication to go stale such that
  ** the client needs to reauthenticate.  Once that info is
  ** available, use it here.
  */
#if 0 /* set to 1 when debugging this functionality */
  infof(data,"%s: authstage = %d\n",__FUNCTION__,data->state.authstage);
  infof(data,"%s: authwant = 0x%08x\n",__FUNCTION__,data->state.authwant);
  infof(data,"%s: authavail = 0x%08x\n",__FUNCTION__,data->state.authavail);
  infof(data,"%s: httpcode = %d\n",__FUNCTION__,k->httpcode);
  infof(data,"%s: authdone = %d\n",__FUNCTION__,data->state.authdone);
  infof(data,"%s: newurl = %s\n",__FUNCTION__,data->req.newurl ?
        data->req.newurl : "(null)");
  infof(data,"%s: authproblem = %d\n",__FUNCTION__,data->state.authproblem);
#endif

  /*
  ** Either we're not authenticating, or we're supposed to
  ** be authenticating something else.  This is an error.
  */
  if((httpcode == 401) && !conn->bits.user_passwd)
    return TRUE;
  if((httpcode == 407) && !conn->bits.proxy_user_passwd)
    return TRUE;

  return data->state.authproblem;
}

/*
 * readmoredata() is a "fread() emulation" to provide POST and/or request
 * data. It is used when a huge POST is to be made and the entire chunk wasn't
 * sent in the first send(). This function will then be called from the
 * transfer.c loop when more data is to be sent to the peer.
 *
 * Returns the amount of bytes it filled the buffer with.
 */
static size_t readmoredata(char *buffer,
                           size_t size,
                           size_t nitems,
                           void *userp)
{
  struct connectdata *conn = (struct connectdata *)userp;
  struct HTTP *http = conn->data->state.proto.http;
  size_t fullsize = size * nitems;

  if(0 == http->postsize)
    /* nothing to return */
    return 0;

  /* make sure that a HTTP request is never sent away chunked! */
  conn->data->req.forbidchunk = (bool)(http->sending == HTTPSEND_REQUEST);

  if(http->postsize <= (curl_off_t)fullsize) {
    memcpy(buffer, http->postdata, (size_t)http->postsize);
    fullsize = (size_t)http->postsize;

    if(http->backup.postsize) {
      /* move backup data into focus and continue on that */
      http->postdata = http->backup.postdata;
      http->postsize = http->backup.postsize;
      conn->fread_func = http->backup.fread_func;
      conn->fread_in = http->backup.fread_in;

      http->sending++; /* move one step up */

      http->backup.postsize=0;
    }
    else
      http->postsize = 0;

    return fullsize;
  }

  memcpy(buffer, http->postdata, fullsize);
  http->postdata += fullsize;
  http->postsize -= fullsize;

  return fullsize;
}

/* ------------------------------------------------------------------------- */
/*
 * The add_buffer series of functions are used to build one large memory chunk
 * from repeated function invokes. Used so that the entire HTTP request can
 * be sent in one go.
 */

struct send_buffer {
  char *buffer;
  size_t size_max;
  size_t size_used;
};
typedef struct send_buffer send_buffer;

static CURLcode add_custom_headers(struct connectdata *conn,
                                   send_buffer *req_buffer);
static CURLcode
 add_buffer(send_buffer *in, const void *inptr, size_t size);

/*
 * add_buffer_init() sets up and returns a fine buffer struct
 */
static
send_buffer *add_buffer_init(void)
{
  return calloc(sizeof(send_buffer), 1);
}

/*
 * add_buffer_send() sends a header buffer and frees all associated memory.
 * Body data may be appended to the header data if desired.
 *
 * Returns CURLcode
 */
static
CURLcode add_buffer_send(send_buffer *in,
                         struct connectdata *conn,
                         long *bytes_written, /* add the number of sent bytes
                                                 to this counter */
                         size_t included_body_bytes, /* how much of the buffer
                                                        contains body data */
                         int socketindex)

{
  ssize_t amount;
  CURLcode res;
  char *ptr;
  size_t size;
  struct HTTP *http = conn->data->state.proto.http;
  size_t sendsize;
  curl_socket_t sockfd;
  size_t headersize;

  DEBUGASSERT(socketindex <= SECONDARYSOCKET);

  sockfd = conn->sock[socketindex];

  /* The looping below is required since we use non-blocking sockets, but due
     to the circumstances we will just loop and try again and again etc */

  ptr = in->buffer;
  size = in->size_used;

  headersize = size - included_body_bytes; /* the initial part that isn't body
                                              is header */

  DEBUGASSERT(size > included_body_bytes);

#ifdef CURL_DOES_CONVERSIONS
  res = Curl_convert_to_network(conn->data, ptr, headersize);
  /* Curl_convert_to_network calls failf if unsuccessful */
  if(res != CURLE_OK) {
    /* conversion failed, free memory and return to the caller */
    if(in->buffer)
      free(in->buffer);
    free(in);
    return res;
  }
#endif /* CURL_DOES_CONVERSIONS */

  if(conn->protocol & PROT_HTTPS) {
    /* We never send more than CURL_MAX_WRITE_SIZE bytes in one single chunk
       when we speak HTTPS, as if only a fraction of it is sent now, this data
       needs to fit into the normal read-callback buffer later on and that
       buffer is using this size.
    */

    sendsize= (size > CURL_MAX_WRITE_SIZE)?CURL_MAX_WRITE_SIZE:size;

    /* OpenSSL is very picky and we must send the SAME buffer pointer to the
       library when we attempt to re-send this buffer. Sending the same data
       is not enough, we must use the exact same address. For this reason, we
       must copy the data to the uploadbuffer first, since that is the buffer
       we will be using if this send is retried later.
    */
    memcpy(conn->data->state.uploadbuffer, ptr, sendsize);
    ptr = conn->data->state.uploadbuffer;
  }
  else
    sendsize = size;

  res = Curl_write(conn, sockfd, ptr, sendsize, &amount);

  if(CURLE_OK == res) {
    /*
     * Note that we may not send the entire chunk at once, and we have a set
     * number of data bytes at the end of the big buffer (out of which we may
     * only send away a part).
     */
    /* how much of the header that was sent */
    size_t headlen = (size_t)amount>headersize?headersize:(size_t)amount;
    size_t bodylen = amount - headlen;

    if(conn->data->set.verbose) {
      /* this data _may_ contain binary stuff */
      Curl_debug(conn->data, CURLINFO_HEADER_OUT, ptr, headlen, conn);
      if((size_t)amount > headlen) {
        /* there was body data sent beyond the initial header part, pass that
           on to the debug callback too */
        Curl_debug(conn->data, CURLINFO_DATA_OUT,
                   ptr+headlen, bodylen, conn);
      }
    }
    if(bodylen)
      /* since we sent a piece of the body here, up the byte counter for it
         accordingly */
      http->writebytecount += bodylen;

    *bytes_written += amount;

    if(http) {
      if((size_t)amount != size) {
        /* The whole request could not be sent in one system call. We must
           queue it up and send it later when we get the chance. We must not
           loop here and wait until it might work again. */

        size -= amount;

        ptr = in->buffer + amount;

        /* backup the currently set pointers */
        http->backup.fread_func = conn->fread_func;
        http->backup.fread_in = conn->fread_in;
        http->backup.postdata = http->postdata;
        http->backup.postsize = http->postsize;

        /* set the new pointers for the request-sending */
        conn->fread_func = (curl_read_callback)readmoredata;
        conn->fread_in = (void *)conn;
        http->postdata = ptr;
        http->postsize = (curl_off_t)size;

        http->send_buffer = in;
        http->sending = HTTPSEND_REQUEST;

        return CURLE_OK;
      }
      http->sending = HTTPSEND_BODY;
      /* the full buffer was sent, clean up and return */
    }
    else {
      if((size_t)amount != size)
        /* We have no continue-send mechanism now, fail. This can only happen
           when this function is used from the CONNECT sending function. We
           currently (stupidly) assume that the whole request is always sent
           away in the first single chunk.

           This needs FIXing.
        */
        return CURLE_SEND_ERROR;
      else
        conn->writechannel_inuse = FALSE;
    }
  }
  if(in->buffer)
    free(in->buffer);
  free(in);

  return res;
}


/*
 * add_bufferf() add the formatted input to the buffer.
 */
static
CURLcode add_bufferf(send_buffer *in, const char *fmt, ...)
{
  char *s;
  va_list ap;
  va_start(ap, fmt);
  s = vaprintf(fmt, ap); /* this allocs a new string to append */
  va_end(ap);

  if(s) {
    CURLcode result = add_buffer(in, s, strlen(s));
    free(s);
    return result;
  }
  /* If we failed, we cleanup the whole buffer and return error */
  if(in->buffer)
    free(in->buffer);
  free(in);
  return CURLE_OUT_OF_MEMORY;
}

/*
 * add_buffer() appends a memory chunk to the existing buffer
 */
static
CURLcode add_buffer(send_buffer *in, const void *inptr, size_t size)
{
  char *new_rb;
  size_t new_size;

  if(~size < in->size_used) {
    /* If resulting used size of send buffer would wrap size_t, cleanup
       the whole buffer and return error. Otherwise the required buffer
       size will fit into a single allocatable memory chunk */
    Curl_safefree(in->buffer);
    free(in);
    return CURLE_OUT_OF_MEMORY;
  }

  if(!in->buffer ||
     ((in->size_used + size) > (in->size_max - 1))) {

    /* If current buffer size isn't enough to hold the result, use a
       buffer size that doubles the required size. If this new size
       would wrap size_t, then just use the largest possible one */

    if((size > (size_t)-1/2) || (in->size_used > (size_t)-1/2) ||
       (~(size*2) < (in->size_used*2)))
      new_size = (size_t)-1;
    else
      new_size = (in->size_used+size)*2;

    if(in->buffer)
      /* we have a buffer, enlarge the existing one */
      new_rb = realloc(in->buffer, new_size);
    else
      /* create a new buffer */
      new_rb = malloc(new_size);

    if(!new_rb) {
      /* If we failed, we cleanup the whole buffer and return error */
      Curl_safefree(in->buffer);
      free(in);
      return CURLE_OUT_OF_MEMORY;
    }

    in->buffer = new_rb;
    in->size_max = new_size;
  }
  memcpy(&in->buffer[in->size_used], inptr, size);

  in->size_used += size;

  return CURLE_OK;
}

/* end of the add_buffer functions */
/* ------------------------------------------------------------------------- */

/*
 * Curl_compareheader()
 *
 * Returns TRUE if 'headerline' contains the 'header' with given 'content'.
 * Pass headers WITH the colon.
 */
bool
Curl_compareheader(const char *headerline, /* line to check */
                   const char *header,  /* header keyword _with_ colon */
                   const char *content) /* content string to find */
{
  /* RFC2616, section 4.2 says: "Each header field consists of a name followed
   * by a colon (":") and the field value. Field names are case-insensitive.
   * The field value MAY be preceded by any amount of LWS, though a single SP
   * is preferred." */

  size_t hlen = strlen(header);
  size_t clen;
  size_t len;
  const char *start;
  const char *end;

  if(!Curl_raw_nequal(headerline, header, hlen))
    return FALSE; /* doesn't start with header */

  /* pass the header */
  start = &headerline[hlen];

  /* pass all white spaces */
  while(*start && ISSPACE(*start))
    start++;

  /* find the end of the header line */
  end = strchr(start, '\r'); /* lines end with CRLF */
  if(!end) {
    /* in case there's a non-standard compliant line here */
    end = strchr(start, '\n');

    if(!end)
      /* hm, there's no line ending here, use the zero byte! */
      end = strchr(start, '\0');
  }

  len = end-start; /* length of the content part of the input line */
  clen = strlen(content); /* length of the word to find */

  /* find the content string in the rest of the line */
  for(;len>=clen;len--, start++) {
    if(Curl_raw_nequal(start, content, clen))
      return TRUE; /* match! */
  }

  return FALSE; /* no match */
}

#ifndef CURL_DISABLE_PROXY
/*
 * Curl_proxyCONNECT() requires that we're connected to a HTTP proxy. This
 * function will issue the necessary commands to get a seamless tunnel through
 * this proxy. After that, the socket can be used just as a normal socket.
 *
 * This badly needs to be rewritten. CONNECT should be sent and dealt with
 * like any ordinary HTTP request, and not specially crafted like this. This
 * function only remains here like this for now since the rewrite is a bit too
 * much work to do at the moment.
 *
 * This function is BLOCKING which is nasty for all multi interface using apps.
 */

CURLcode Curl_proxyCONNECT(struct connectdata *conn,
                           int sockindex,
                           const char *hostname,
                           unsigned short remote_port)
{
  int subversion=0;
  struct SessionHandle *data=conn->data;
  struct SingleRequest *k = &data->req;
  CURLcode result;
  int res;
  long timeout =
    data->set.timeout?data->set.timeout:PROXY_TIMEOUT; /* in milliseconds */
  curl_socket_t tunnelsocket = conn->sock[sockindex];
  curl_off_t cl=0;
  bool closeConnection = FALSE;
  bool chunked_encoding = FALSE;
  long check;

#define SELECT_OK      0
#define SELECT_ERROR   1
#define SELECT_TIMEOUT 2
  int error = SELECT_OK;

  conn->bits.proxy_connect_closed = FALSE;

  do {
    if(!conn->bits.tunnel_connecting) { /* BEGIN CONNECT PHASE */
      char *host_port;
      send_buffer *req_buffer;

      infof(data, "Establish HTTP proxy tunnel to %s:%d\n",
            hostname, remote_port);

      if(data->req.newurl) {
        /* This only happens if we've looped here due to authentication
           reasons, and we don't really use the newly cloned URL here
           then. Just free() it. */
        free(data->req.newurl);
        data->req.newurl = NULL;
      }

      /* initialize a dynamic send-buffer */
      req_buffer = add_buffer_init();

      if(!req_buffer)
        return CURLE_OUT_OF_MEMORY;

      host_port = aprintf("%s:%d", hostname, remote_port);
      if(!host_port) {
        free(req_buffer);
        return CURLE_OUT_OF_MEMORY;
      }

      /* Setup the proxy-authorization header, if any */
      result = http_output_auth(conn, "CONNECT", host_port, TRUE);

      if(CURLE_OK == result) {
        char *host=(char *)"";
        const char *proxyconn="";
        const char *useragent="";
        const char *http = (conn->proxytype == CURLPROXY_HTTP_1_0) ?
          "1.0" : "1.1";

        if(!checkheaders(data, "Host:")) {
          host = aprintf("Host: %s\r\n", host_port);
          if(!host) {
            free(req_buffer);
            free(host_port);
            return CURLE_OUT_OF_MEMORY;
          }
        }
        if(!checkheaders(data, "Proxy-Connection:"))
          proxyconn = "Proxy-Connection: Keep-Alive\r\n";

        if(!checkheaders(data, "User-Agent:") &&
           data->set.str[STRING_USERAGENT])
          useragent = conn->allocptr.uagent;

        /* Send the connect request to the proxy */
        /* BLOCKING */
        result =
          add_bufferf(req_buffer,
                      "CONNECT %s:%d HTTP/%s\r\n"
                      "%s"  /* Host: */
                      "%s"  /* Proxy-Authorization */
                      "%s"  /* User-Agent */
                      "%s", /* Proxy-Connection */
                      hostname, remote_port, http,
                      host,
                      conn->allocptr.proxyuserpwd?
                      conn->allocptr.proxyuserpwd:"",
                      useragent,
                      proxyconn);

        if(host && *host)
          free(host);

        if(CURLE_OK == result)
          result = add_custom_headers(conn, req_buffer);

        if(CURLE_OK == result)
          /* CRLF terminate the request */
          result = add_bufferf(req_buffer, "\r\n");

        if(CURLE_OK == result) {
          /* Now send off the request */
          result = add_buffer_send(req_buffer, conn,
                                   &data->info.request_size, 0, sockindex);
        }
        req_buffer = NULL;
        if(result)
          failf(data, "Failed sending CONNECT to proxy");
      }
      free(host_port);
      Curl_safefree(req_buffer);
      if(result)
        return result;

      conn->bits.tunnel_connecting = TRUE;
    } /* END CONNECT PHASE */

    /* now we've issued the CONNECT and we're waiting to hear back -
       we try not to block here in multi-mode because that might be a LONG
       wait if the proxy cannot connect-through to the remote host. */

    /* if timeout is requested, find out how much remaining time we have */
    check = timeout - /* timeout time */
      Curl_tvdiff(Curl_tvnow(), conn->now); /* spent time */
    if(check <= 0) {
      failf(data, "Proxy CONNECT aborted due to timeout");
      return CURLE_RECV_ERROR;
    }

    /* if we're in multi-mode and we would block, return instead for a retry */
    if(Curl_if_multi == data->state.used_interface) {
      if(0 == Curl_socket_ready(tunnelsocket, CURL_SOCKET_BAD, 0))
        /* return so we'll be called again polling-style */
        return CURLE_OK;
      else {
        DEBUGF(infof(data,
                     "Multi mode finished polling for response from "
                     "proxy CONNECT."));
      }
    }
    else {
      DEBUGF(infof(data, "Easy mode waiting for response from proxy CONNECT."));
    }

    /* at this point, either:
       1) we're in easy-mode and so it's okay to block waiting for a CONNECT
       response
       2) we're in multi-mode and we didn't block - it's either an error or we
       now have some data waiting.
       In any case, the tunnel_connecting phase is over. */
    conn->bits.tunnel_connecting = FALSE;

    { /* BEGIN NEGOTIATION PHASE */
      size_t nread;   /* total size read */
      int perline; /* count bytes per line */
      int keepon=TRUE;
      ssize_t gotbytes;
      char *ptr;
      char *line_start;

      ptr=data->state.buffer;
      line_start = ptr;

      nread=0;
      perline=0;
      keepon=TRUE;

      while((nread<BUFSIZE) && (keepon && !error)) {

        /* if timeout is requested, find out how much remaining time we have */
        check = timeout - /* timeout time */
          Curl_tvdiff(Curl_tvnow(), conn->now); /* spent time */
        if(check <= 0) {
          failf(data, "Proxy CONNECT aborted due to timeout");
          error = SELECT_TIMEOUT; /* already too little time */
          break;
        }

        /* loop every second at least, less if the timeout is near */
        switch (Curl_socket_ready(tunnelsocket, CURL_SOCKET_BAD,
                            check<1000L?(int)check:1000)) {
        case -1: /* select() error, stop reading */
          error = SELECT_ERROR;
          failf(data, "Proxy CONNECT aborted due to select/poll error");
          break;
        case 0: /* timeout */
          break;
        default:
          DEBUGASSERT(ptr+BUFSIZE-nread <= data->state.buffer+BUFSIZE+1);
          res = Curl_read(conn, tunnelsocket, ptr, BUFSIZE-nread, &gotbytes);
          if(res< 0)
            /* EWOULDBLOCK */
            continue; /* go loop yourself */
          else if(res)
            keepon = FALSE;
          else if(gotbytes <= 0) {
            keepon = FALSE;
            if(data->set.proxyauth && data->state.authproxy.avail) {
              /* proxy auth was requested and there was proxy auth available,
                 then deem this as "mere" proxy disconnect */
              conn->bits.proxy_connect_closed = TRUE;
            }
            else {
              error = SELECT_ERROR;
              failf(data, "Proxy CONNECT aborted");
            }
          }
          else {
            /*
             * We got a whole chunk of data, which can be anything from one
             * byte to a set of lines and possibly just a piece of the last
             * line.
             */
            int i;

            nread += gotbytes;

            if(keepon > TRUE) {
              /* This means we are currently ignoring a response-body */

              nread = 0; /* make next read start over in the read buffer */
              ptr=data->state.buffer;
              if(cl) {
                /* A Content-Length based body: simply count down the counter
                   and make sure to break out of the loop when we're done! */
                cl -= gotbytes;
                if(cl<=0) {
                  keepon = FALSE;
                  break;
                }
              }
              else {
                /* chunked-encoded body, so we need to do the chunked dance
                   properly to know when the end of the body is reached */
                CHUNKcode r;
                ssize_t tookcareof=0;

                /* now parse the chunked piece of data so that we can
                   properly tell when the stream ends */
                r = Curl_httpchunk_read(conn, ptr, gotbytes, &tookcareof);
                if(r == CHUNKE_STOP) {
                  /* we're done reading chunks! */
                  infof(data, "chunk reading DONE\n");
                  keepon = FALSE;
                }
                else
                  infof(data, "Read %d bytes of chunk, continue\n",
                        tookcareof);
              }
            }
            else
              for(i = 0; i < gotbytes; ptr++, i++) {
                perline++; /* amount of bytes in this line so far */
                if(*ptr == 0x0a) {
                  char letter;
                  int writetype;

#ifdef CURL_DOES_CONVERSIONS
                  /* convert from the network encoding */
                  result = Curl_convert_from_network(data, line_start, perline);
                  /* Curl_convert_from_network calls failf if unsuccessful */
                  if(result)
                    return result;
#endif /* CURL_DOES_CONVERSIONS */

                  /* output debug if that is requested */
                  if(data->set.verbose)
                    Curl_debug(data, CURLINFO_HEADER_IN,
                               line_start, (size_t)perline, conn);

                  /* send the header to the callback */
                  writetype = CLIENTWRITE_HEADER;
                  if(data->set.include_header)
                    writetype |= CLIENTWRITE_BODY;

                  result = Curl_client_write(conn, writetype, line_start,
                                             perline);
                  if(result)
                    return result;

                  /* Newlines are CRLF, so the CR is ignored as the line isn't
                     really terminated until the LF comes. Treat a following CR
                     as end-of-headers as well.*/

                  if(('\r' == line_start[0]) ||
                     ('\n' == line_start[0])) {
                    /* end of response-headers from the proxy */
                    nread = 0; /* make next read start over in the read
                                  buffer */
                    ptr=data->state.buffer;
                    if((407 == k->httpcode) && !data->state.authproblem) {
                      /* If we get a 407 response code with content length
                         when we have no auth problem, we must ignore the
                         whole response-body */
                      keepon = 2;

                      if(cl) {

                        infof(data, "Ignore %" FORMAT_OFF_T
                              " bytes of response-body\n", cl);
                        /* remove the remaining chunk of what we already
                           read */
                        cl -= (gotbytes - i);

                        if(cl<=0)
                          /* if the whole thing was already read, we are done!
                           */
                          keepon=FALSE;
                      }
                      else if(chunked_encoding) {
                        CHUNKcode r;
                        /* We set ignorebody true here since the chunked
                           decoder function will acknowledge that. Pay
                           attention so that this is cleared again when this
                           function returns! */
                        k->ignorebody = TRUE;
                        infof(data, "%d bytes of chunk left\n", gotbytes-i);

                        if(line_start[1] == '\n') {
                          /* this can only be a LF if the letter at index 0
                             was a CR */
                          line_start++;
                          i++;
                        }

                        /* now parse the chunked piece of data so that we can
                           properly tell when the stream ends */
                        r = Curl_httpchunk_read(conn, line_start+1,
                                                  gotbytes -i, &gotbytes);
                        if(r == CHUNKE_STOP) {
                          /* we're done reading chunks! */
                          infof(data, "chunk reading DONE\n");
                          keepon = FALSE;
                        }
                        else
                          infof(data, "Read %d bytes of chunk, continue\n",
                                gotbytes);
                      }
                      else {
                        /* without content-length or chunked encoding, we
                           can't keep the connection alive since the close is
                           the end signal so we bail out at once instead */
                        keepon=FALSE;
                      }
                    }
                    else
                      keepon = FALSE;
                    break; /* breaks out of for-loop, not switch() */
                  }

                  /* keep a backup of the position we are about to blank */
                  letter = line_start[perline];
                  line_start[perline]=0; /* zero terminate the buffer */
                  if((checkprefix("WWW-Authenticate:", line_start) &&
                      (401 == k->httpcode)) ||
                     (checkprefix("Proxy-authenticate:", line_start) &&
                      (407 == k->httpcode))) {
                    result = Curl_http_input_auth(conn, k->httpcode,
                                                  line_start);
                    if(result)
                      return result;
                  }
                  else if(checkprefix("Content-Length:", line_start)) {
                    cl = curlx_strtoofft(line_start + strlen("Content-Length:"),
                                         NULL, 10);
                  }
                  else if(Curl_compareheader(line_start,
                                             "Connection:", "close"))
                    closeConnection = TRUE;
                  else if(Curl_compareheader(line_start,
                                             "Transfer-Encoding:", "chunked")) {
                    infof(data, "CONNECT responded chunked\n");
                    chunked_encoding = TRUE;
                    /* init our chunky engine */
                    Curl_httpchunk_init(conn);
                  }
                  else if(Curl_compareheader(line_start,
                                             "Proxy-Connection:", "close"))
                    closeConnection = TRUE;
                  else if(2 == sscanf(line_start, "HTTP/1.%d %d",
                                      &subversion,
                                      &k->httpcode)) {
                    /* store the HTTP code from the proxy */
                    data->info.httpproxycode = k->httpcode;
                  }
                  /* put back the letter we blanked out before */
                  line_start[perline]= letter;

                  perline=0; /* line starts over here */
                  line_start = ptr+1; /* this skips the zero byte we wrote */
                }
              }
          }
          break;
        } /* switch */
        if(Curl_pgrsUpdate(conn))
          return CURLE_ABORTED_BY_CALLBACK;
      } /* while there's buffer left and loop is requested */

      if(error)
        return CURLE_RECV_ERROR;

      if(data->info.httpproxycode != 200) {
        /* Deal with the possibly already received authenticate
           headers. 'newurl' is set to a new URL if we must loop. */
        result = Curl_http_auth_act(conn);
        if(result)
          return result;

        if(conn->bits.close)
          /* the connection has been marked for closure, most likely in the
             Curl_http_auth_act() function and thus we can kill it at once
             below
          */
          closeConnection = TRUE;
      }

      if(closeConnection && data->req.newurl) {
        /* Connection closed by server. Don't use it anymore */
        sclose(conn->sock[sockindex]);
        conn->sock[sockindex] = CURL_SOCKET_BAD;
        break;
      }
    } /* END NEGOTIATION PHASE */
  } while(data->req.newurl);

  if(200 != data->req.httpcode) {
    failf(data, "Received HTTP code %d from proxy after CONNECT",
          data->req.httpcode);

    if(closeConnection && data->req.newurl)
      conn->bits.proxy_connect_closed = TRUE;

    return CURLE_RECV_ERROR;
  }

  /* If a proxy-authorization header was used for the proxy, then we should
     make sure that it isn't accidentally used for the document request
     after we've connected. So let's free and clear it here. */
  Curl_safefree(conn->allocptr.proxyuserpwd);
  conn->allocptr.proxyuserpwd = NULL;

  data->state.authproxy.done = TRUE;

  infof (data, "Proxy replied OK to CONNECT request\n");
  data->req.ignorebody = FALSE; /* put it (back) to non-ignore state */
  return CURLE_OK;
}
#endif /* CURL_DISABLE_PROXY */

/*
 * Curl_http_connect() performs HTTP stuff to do at connect-time, called from
 * the generic Curl_connect().
 */
CURLcode Curl_http_connect(struct connectdata *conn, bool *done)
{
  struct SessionHandle *data;
  CURLcode result;

  data=conn->data;

  /* We default to persistent connections. We set this already in this connect
     function to make the re-use checks properly be able to check this bit. */
  conn->bits.close = FALSE;

#ifndef CURL_DISABLE_PROXY
  /* If we are not using a proxy and we want a secure connection, perform SSL
   * initialization & connection now.  If using a proxy with https, then we
   * must tell the proxy to CONNECT to the host we want to talk to.  Only
   * after the connect has occurred, can we start talking SSL
   */
  if(conn->bits.tunnel_proxy && conn->bits.httpproxy) {

    /* either SSL over proxy, or explicitly asked for */
    result = Curl_proxyCONNECT(conn, FIRSTSOCKET,
                               conn->host.name,
                               conn->remote_port);
    if(CURLE_OK != result)
      return result;
  }

  if(conn->bits.tunnel_connecting) {
    /* nothing else to do except wait right now - we're not done here. */
    return CURLE_OK;
  }
#endif /* CURL_DISABLE_PROXY */

  if(!data->state.this_is_a_follow) {
    /* this is not a followed location, get the original host name */
    if(data->state.first_host)
      /* Free to avoid leaking memory on multiple requests*/
      free(data->state.first_host);

    data->state.first_host = strdup(conn->host.name);
    if(!data->state.first_host)
      return CURLE_OUT_OF_MEMORY;
  }

  if(conn->protocol & PROT_HTTPS) {
    /* perform SSL initialization */
    if(data->state.used_interface == Curl_if_multi) {
      result = https_connecting(conn, done);
      if(result)
        return result;
    }
    else {
      /* BLOCKING */
      result = Curl_ssl_connect(conn, FIRSTSOCKET);
      if(result)
        return result;
      *done = TRUE;
    }
  }
  else {
    *done = TRUE;
  }

  return CURLE_OK;
}

/* this returns the socket to wait for in the DO and DOING state for the multi
   interface and then we're always _sending_ a request and thus we wait for
   the single socket to become writable only */
static int http_getsock_do(struct connectdata *conn,
                           curl_socket_t *socks,
                           int numsocks)
{
  /* write mode */
  (void)numsocks; /* unused, we trust it to be at least 1 */
  socks[0] = conn->sock[FIRSTSOCKET];
  return GETSOCK_WRITESOCK(0);
}

#ifdef USE_SSL
static CURLcode https_connecting(struct connectdata *conn, bool *done)
{
  CURLcode result;
  DEBUGASSERT((conn) && (conn->protocol & PROT_HTTPS));

  /* perform SSL initialization for this socket */
  result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, done);
  if(result)
    conn->bits.close = TRUE; /* a failed connection is marked for closure
                                to prevent (bad) re-use or similar */
  return result;
}
#endif

#ifdef USE_SSLEAY
/* This function is OpenSSL-specific. It should be made to query the generic
   SSL layer instead. */
static int https_getsock(struct connectdata *conn,
                         curl_socket_t *socks,
                         int numsocks)
{
  if(conn->protocol & PROT_HTTPS) {
    struct ssl_connect_data *connssl = &conn->ssl[FIRSTSOCKET];

    if(!numsocks)
      return GETSOCK_BLANK;

    if(connssl->connecting_state == ssl_connect_2_writing) {
      /* write mode */
      socks[0] = conn->sock[FIRSTSOCKET];
      return GETSOCK_WRITESOCK(0);
    }
    else if(connssl->connecting_state == ssl_connect_2_reading) {
      /* read mode */
      socks[0] = conn->sock[FIRSTSOCKET];
      return GETSOCK_READSOCK(0);
    }
  }
  return CURLE_OK;
}
#else
#ifdef USE_GNUTLS
static int https_getsock(struct connectdata *conn,
                         curl_socket_t *socks,
                         int numsocks)
{
  (void)conn;
  (void)socks;
  (void)numsocks;
  return GETSOCK_BLANK;
}
#else
#ifdef USE_NSS
static int https_getsock(struct connectdata *conn,
                         curl_socket_t *socks,
                         int numsocks)
{
  (void)conn;
  (void)socks;
  (void)numsocks;
  return GETSOCK_BLANK;
}
#else
#ifdef USE_QSOSSL
static int https_getsock(struct connectdata *conn,
                         curl_socket_t *socks,
                         int numsocks)
{
  (void)conn;
  (void)socks;
  (void)numsocks;
  return GETSOCK_BLANK;
}
#endif
#endif
#endif
#endif

/*
 * Curl_http_done() gets called from Curl_done() after a single HTTP request
 * has been performed.
 */

CURLcode Curl_http_done(struct connectdata *conn,
                        CURLcode status, bool premature)
{
  struct SessionHandle *data = conn->data;
  struct HTTP *http =data->state.proto.http;
  (void)premature; /* not used */

  Curl_unencode_cleanup(conn);

  /* set the proper values (possibly modified on POST) */
  conn->fread_func = data->set.fread_func; /* restore */
  conn->fread_in = data->set.in; /* restore */
  conn->seek_func = data->set.seek_func; /* restore */
  conn->seek_client = data->set.seek_client; /* restore */

  if(http == NULL)
    return CURLE_OK;

  if(http->send_buffer) {
    send_buffer *buff = http->send_buffer;

    free(buff->buffer);
    free(buff);
    http->send_buffer = NULL; /* clear the pointer */
  }

  if(HTTPREQ_POST_FORM == data->set.httpreq) {
    data->req.bytecount = http->readbytecount + http->writebytecount;

    Curl_formclean(&http->sendit); /* Now free that whole lot */
    if(http->form.fp) {
      /* a file being uploaded was left opened, close it! */
      fclose(http->form.fp);
      http->form.fp = NULL;
    }
  }
  else if(HTTPREQ_PUT == data->set.httpreq)
    data->req.bytecount = http->readbytecount + http->writebytecount;

  if(status != CURLE_OK)
    return (status);

  if(!premature && /* this check is pointless when DONE is called before the
                      entire operation is complete */
     !conn->bits.retry &&
     ((http->readbytecount +
       data->req.headerbytecount -
       data->req.deductheadercount)) <= 0) {
    /* If this connection isn't simply closed to be retried, AND nothing was
       read from the HTTP server (that counts), this can't be right so we
       return an error here */
    failf(data, "Empty reply from server");
    return CURLE_GOT_NOTHING;
  }

  return CURLE_OK;
}


/* Determine if we should use HTTP 1.1 for this request. Reasons to avoid it
are if the user specifically requested HTTP 1.0, if the server we are
connected to only supports 1.0, or if any server previously contacted to
handle this request only supports 1.0. */
static bool use_http_1_1(const struct SessionHandle *data,
                         const struct connectdata *conn)
{
  return (bool)((data->set.httpversion == CURL_HTTP_VERSION_1_1) ||
         ((data->set.httpversion != CURL_HTTP_VERSION_1_0) &&
          ((conn->httpversion == 11) ||
           ((conn->httpversion != 10) &&
            (data->state.httpversion != 10)))));
}

/* check and possibly add an Expect: header */
static CURLcode expect100(struct SessionHandle *data,
                          struct connectdata *conn,
                          send_buffer *req_buffer)
{
  CURLcode result = CURLE_OK;
  data->state.expect100header = FALSE; /* default to false unless it is set
                                          to TRUE below */
  if(use_http_1_1(data, conn) && !checkheaders(data, "Expect:")) {
    /* if not doing HTTP 1.0 or disabled explicitly, we add a Expect:
       100-continue to the headers which actually speeds up post
       operations (as there is one packet coming back from the web
       server) */
    result = add_bufferf(req_buffer,
                         "Expect: 100-continue\r\n");
    if(result == CURLE_OK)
      data->state.expect100header = TRUE;
  }
  return result;
}

static CURLcode add_custom_headers(struct connectdata *conn,
                                   send_buffer *req_buffer)
{
  char *ptr;
  struct curl_slist *headers=conn->data->set.headers;

  while(headers) {
    ptr = strchr(headers->data, ':');
    if(ptr) {
      /* we require a colon for this to be a true header */

      ptr++; /* pass the colon */
      while(*ptr && ISSPACE(*ptr))
        ptr++;

      if(*ptr) {
        /* only send this if the contents was non-blank */

        if(conn->allocptr.host &&
           /* a Host: header was sent already, don't pass on any custom Host:
              header as that will produce *two* in the same request! */
           checkprefix("Host:", headers->data))
          ;
        else if(conn->data->set.httpreq == HTTPREQ_POST_FORM &&
                /* this header (extended by formdata.c) is sent later */
                checkprefix("Content-Type:", headers->data))
          ;
        else if(conn->bits.authneg &&
                /* while doing auth neg, don't allow the custom length since
                   we will force length zero then */
                checkprefix("Content-Length", headers->data))
          ;
        else {
          CURLcode result = add_bufferf(req_buffer, "%s\r\n", headers->data);
          if(result)
            return result;
        }
      }
    }
    headers = headers->next;
  }
  return CURLE_OK;
}

/*
 * Curl_http() gets called from the generic Curl_do() function when a HTTP
 * request is to be performed. This creates and sends a properly constructed
 * HTTP request.
 */
CURLcode Curl_http(struct connectdata *conn, bool *done)
{
  struct SessionHandle *data=conn->data;
  char *buf = data->state.buffer; /* this is a short cut to the buffer */
  CURLcode result=CURLE_OK;
  struct HTTP *http;
  const char *ppath = data->state.path;
  bool paste_ftp_userpwd = FALSE;
  char ftp_typecode[sizeof(";type=?")] = "";
  const char *host = conn->host.name;
  const char *te = ""; /* transfer-encoding */
  const char *ptr;
  const char *request;
  Curl_HttpReq httpreq = data->set.httpreq;
  char *addcookies = NULL;
  curl_off_t included_body = 0;
  const char *httpstring;
  send_buffer *req_buffer;
  curl_off_t postsize; /* off_t type to be able to hold a large file size */
  int seekerr = CURL_SEEKFUNC_OK;

  /* Always consider the DO phase done after this function call, even if there
     may be parts of the request that is not yet sent, since we can deal with
     the rest of the request in the PERFORM phase. */
  *done = TRUE;

  /* If there already is a protocol-specific struct allocated for this
     sessionhandle, deal with it */
  Curl_reset_reqproto(conn);

  if(!data->state.proto.http) {
    /* Only allocate this struct if we don't already have it! */

    http = calloc(sizeof(struct HTTP), 1);
    if(!http)
      return CURLE_OUT_OF_MEMORY;
    data->state.proto.http = http;
  }
  else
    http = data->state.proto.http;

  if( (conn->protocol&(PROT_HTTP|PROT_FTP)) &&
       data->set.upload) {
    httpreq = HTTPREQ_PUT;
  }

  /* Now set the 'request' pointer to the proper request string */
  if(data->set.str[STRING_CUSTOMREQUEST])
    request = data->set.str[STRING_CUSTOMREQUEST];
  else {
    if(data->set.opt_no_body)
      request = "HEAD";
    else {
      DEBUGASSERT((httpreq > HTTPREQ_NONE) && (httpreq < HTTPREQ_LAST));
      switch(httpreq) {
      case HTTPREQ_POST:
      case HTTPREQ_POST_FORM:
        request = "POST";
        break;
      case HTTPREQ_PUT:
        request = "PUT";
        break;
      default: /* this should never happen */
      case HTTPREQ_GET:
        request = "GET";
        break;
      case HTTPREQ_HEAD:
        request = "HEAD";
        break;
      }
    }
  }

  /* The User-Agent string might have been allocated in url.c already, because
     it might have been used in the proxy connect, but if we have got a header
     with the user-agent string specified, we erase the previously made string
     here. */
  if(checkheaders(data, "User-Agent:") && conn->allocptr.uagent) {
    free(conn->allocptr.uagent);
    conn->allocptr.uagent=NULL;
  }

  /* setup the authentication headers */
  result = http_output_auth(conn, request, ppath, FALSE);
  if(result)
    return result;

  if((data->state.authhost.multi || data->state.authproxy.multi) &&
     (httpreq != HTTPREQ_GET) &&
     (httpreq != HTTPREQ_HEAD)) {
    /* Auth is required and we are not authenticated yet. Make a PUT or POST
       with content-length zero as a "probe". */
    conn->bits.authneg = TRUE;
  }
  else
    conn->bits.authneg = FALSE;

  Curl_safefree(conn->allocptr.ref);
  if(data->change.referer && !checkheaders(data, "Referer:"))
    conn->allocptr.ref = aprintf("Referer: %s\r\n", data->change.referer);
  else
    conn->allocptr.ref = NULL;

  if(data->set.str[STRING_COOKIE] && !checkheaders(data, "Cookie:"))
    addcookies = data->set.str[STRING_COOKIE];

  if(!checkheaders(data, "Accept-Encoding:") &&
     data->set.str[STRING_ENCODING]) {
    Curl_safefree(conn->allocptr.accept_encoding);
    conn->allocptr.accept_encoding =
      aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]);
    if(!conn->allocptr.accept_encoding)
      return CURLE_OUT_OF_MEMORY;
  }

  ptr = checkheaders(data, "Transfer-Encoding:");
  if(ptr) {
    /* Some kind of TE is requested, check if 'chunked' is chosen */
    data->req.upload_chunky =
      Curl_compareheader(ptr, "Transfer-Encoding:", "chunked");
  }
  else {
    if((conn->protocol&PROT_HTTP) &&
        data->set.upload &&
        (data->set.infilesize == -1)) {
      if (use_http_1_1(data, conn)) {
        /* HTTP, upload, unknown file size and not HTTP 1.0 */
        data->req.upload_chunky = TRUE;
      } else {
        failf(data, "Chunky upload is not supported by HTTP 1.0");
        return CURLE_UPLOAD_FAILED;
      }
    }
    else {
      /* else, no chunky upload */
      data->req.upload_chunky = FALSE;
    }

    if(data->req.upload_chunky)
      te = "Transfer-Encoding: chunked\r\n";
  }

  Curl_safefree(conn->allocptr.host);

  ptr = checkheaders(data, "Host:");
  if(ptr && (!data->state.this_is_a_follow ||
             Curl_raw_equal(data->state.first_host, conn->host.name))) {
#if !defined(CURL_DISABLE_COOKIES)
    /* If we have a given custom Host: header, we extract the host name in
       order to possibly use it for cookie reasons later on. We only allow the
       custom Host: header if this is NOT a redirect, as setting Host: in the
       redirected request is being out on thin ice. Except if the host name
       is the same as the first one! */
    char *cookiehost = Curl_copy_header_value(ptr);
    if (!cookiehost)
      return CURLE_OUT_OF_MEMORY;
    if (!*cookiehost)
      /* ignore empty data */
      free(cookiehost);
    else {
      char *colon = strchr(cookiehost, ':');
      if (colon)
        *colon = 0; /* The host must not include an embedded port number */
      Curl_safefree(conn->allocptr.cookiehost);
      conn->allocptr.cookiehost = cookiehost;
    }
#endif

    conn->allocptr.host = NULL;
  }
  else {
    /* When building Host: headers, we must put the host name within
       [brackets] if the host name is a plain IPv6-address. RFC2732-style. */

    if(((conn->protocol&PROT_HTTPS) && (conn->remote_port == PORT_HTTPS)) ||
       (!(conn->protocol&PROT_HTTPS) && (conn->remote_port == PORT_HTTP)) )
      /* if(HTTPS on port 443) OR (non-HTTPS on port 80) then don't include
         the port number in the host string */
      conn->allocptr.host = aprintf("Host: %s%s%s\r\n",
                                    conn->bits.ipv6_ip?"[":"",
                                    host,
                                    conn->bits.ipv6_ip?"]":"");
    else
      conn->allocptr.host = aprintf("Host: %s%s%s:%d\r\n",
                                    conn->bits.ipv6_ip?"[":"",
                                    host,
                                    conn->bits.ipv6_ip?"]":"",
                                    conn->remote_port);

    if(!conn->allocptr.host)
      /* without Host: we can't make a nice request */
      return CURLE_OUT_OF_MEMORY;
  }

#ifndef CURL_DISABLE_PROXY
  if(conn->bits.httpproxy && !conn->bits.tunnel_proxy)  {
    /* Using a proxy but does not tunnel through it */

    /* The path sent to the proxy is in fact the entire URL. But if the remote
       host is a IDN-name, we must make sure that the request we produce only
       uses the encoded host name! */
    if(conn->host.dispname != conn->host.name) {
      char *url = data->change.url;
      ptr = strstr(url, conn->host.dispname);
      if(ptr) {
        /* This is where the display name starts in the URL, now replace this
           part with the encoded name. TODO: This method of replacing the host
           name is rather crude as I believe there's a slight risk that the
           user has entered a user name or password that contain the host name
           string. */
        size_t currlen = strlen(conn->host.dispname);
        size_t newlen = strlen(conn->host.name);
        size_t urllen = strlen(url);

        char *newurl;

        newurl = malloc(urllen + newlen - currlen + 1);
        if(newurl) {
          /* copy the part before the host name */
          memcpy(newurl, url, ptr - url);
          /* append the new host name instead of the old */
          memcpy(newurl + (ptr - url), conn->host.name, newlen);
          /* append the piece after the host name */
          memcpy(newurl + newlen + (ptr - url),
                 ptr + currlen, /* copy the trailing zero byte too */
                 urllen - (ptr-url) - currlen + 1);
          if(data->change.url_alloc)
            free(data->change.url);
          data->change.url = newurl;
          data->change.url_alloc = TRUE;
        }
        else
          return CURLE_OUT_OF_MEMORY;
      }
    }
    ppath = data->change.url;
    if(checkprefix("ftp://", ppath)) {
      if (data->set.proxy_transfer_mode) {
        /* when doing ftp, append ;type=<a|i> if not present */
        char *p = strstr(ppath, ";type=");
        if(p && p[6] && p[7] == 0) {
          switch (Curl_raw_toupper(p[6])) {
          case 'A':
          case 'D':
          case 'I':
            break;
          default:
            p = NULL;
          }
        }
        if(!p)
          snprintf(ftp_typecode, sizeof(ftp_typecode), ";type=%c",
                   data->set.prefer_ascii ? 'a' : 'i');
      }
      if (conn->bits.user_passwd && !conn->bits.userpwd_in_url)
        paste_ftp_userpwd = TRUE;
    }
  }
#endif /* CURL_DISABLE_PROXY */

  if(HTTPREQ_POST_FORM == httpreq) {
    /* we must build the whole darned post sequence first, so that we have
       a size of the whole shebang before we start to send it */
     result = Curl_getFormData(&http->sendit, data->set.httppost,
                               checkheaders(data, "Content-Type:"),
                               &http->postsize);
     if(CURLE_OK != result) {
       /* Curl_getFormData() doesn't use failf() */
       failf(data, "failed creating formpost data");
       return result;
     }
  }


  http->p_accept = checkheaders(data, "Accept:")?NULL:"Accept: */*\r\n";

  if(( (HTTPREQ_POST == httpreq) ||
       (HTTPREQ_POST_FORM == httpreq) ||
       (HTTPREQ_PUT == httpreq) ) &&
     data->state.resume_from) {
    /**********************************************************************
     * Resuming upload in HTTP means that we PUT or POST and that we have
     * got a resume_from value set. The resume value has already created
     * a Range: header that will be passed along. We need to "fast forward"
     * the file the given number of bytes and decrease the assume upload
     * file size before we continue this venture in the dark lands of HTTP.
     *********************************************************************/

    if(data->state.resume_from < 0 ) {
      /*
       * This is meant to get the size of the present remote-file by itself.
       * We don't support this now. Bail out!
       */
       data->state.resume_from = 0;
    }

    if(data->state.resume_from && !data->state.this_is_a_follow) {
      /* do we still game? */

      /* Now, let's read off the proper amount of bytes from the
         input. */
      if(conn->seek_func) {
        seekerr = conn->seek_func(conn->seek_client, data->state.resume_from,
                                  SEEK_SET);
      }

      if(seekerr != CURL_SEEKFUNC_OK) {
        if(seekerr != CURL_SEEKFUNC_CANTSEEK) {
          failf(data, "Could not seek stream");
          return CURLE_READ_ERROR;
        }
        /* when seekerr == CURL_SEEKFUNC_CANTSEEK (can't seek to offset) */
        else {
          curl_off_t passed=0;

          do {
            size_t readthisamountnow = (size_t)(data->state.resume_from -
                                                passed);
            size_t actuallyread;

            if(readthisamountnow > BUFSIZE)
              readthisamountnow = BUFSIZE;

            actuallyread = data->set.fread_func(data->state.buffer, 1,
                                                (size_t)readthisamountnow,
                                                data->set.in);

            passed += actuallyread;
            if(actuallyread != readthisamountnow) {
              failf(data, "Could only read %" FORMAT_OFF_T
                    " bytes from the input",
                    passed);
              return CURLE_READ_ERROR;
            }
          } while(passed != data->state.resume_from); /* loop until done */
        }
      }

      /* now, decrease the size of the read */
      if(data->set.infilesize>0) {
        data->set.infilesize -= data->state.resume_from;

        if(data->set.infilesize <= 0) {
          failf(data, "File already completely uploaded");
          return CURLE_PARTIAL_FILE;
        }
      }
      /* we've passed, proceed as normal */
    }
  }
  if(data->state.use_range) {
    /*
     * A range is selected. We use different headers whether we're downloading
     * or uploading and we always let customized headers override our internal
     * ones if any such are specified.
     */
    if(((httpreq == HTTPREQ_GET) || (httpreq == HTTPREQ_HEAD)) &&
       !checkheaders(data, "Range:")) {
      /* if a line like this was already allocated, free the previous one */
      if(conn->allocptr.rangeline)
        free(conn->allocptr.rangeline);
      conn->allocptr.rangeline = aprintf("Range: bytes=%s\r\n",
                                         data->state.range);
    }
    else if((httpreq != HTTPREQ_GET) &&
            !checkheaders(data, "Content-Range:")) {

      /* if a line like this was already allocated, free the previous one */
      if(conn->allocptr.rangeline)
        free(conn->allocptr.rangeline);

      if(data->set.set_resume_from < 0) {
        /* Upload resume was asked for, but we don't know the size of the
           remote part so we tell the server (and act accordingly) that we
           upload the whole file (again) */
        conn->allocptr.rangeline =
          aprintf("Content-Range: bytes 0-%" FORMAT_OFF_T
                  "/%" FORMAT_OFF_T "\r\n",
                  data->set.infilesize - 1, data->set.infilesize);

      }
      else if(data->state.resume_from) {
        /* This is because "resume" was selected */
        curl_off_t total_expected_size=
          data->state.resume_from + data->set.infilesize;
        conn->allocptr.rangeline =
            aprintf("Content-Range: bytes %s%" FORMAT_OFF_T
                    "/%" FORMAT_OFF_T "\r\n",
                    data->state.range, total_expected_size-1,
                    total_expected_size);
      }
      else {
        /* Range was selected and then we just pass the incoming range and
           append total size */
        conn->allocptr.rangeline =
            aprintf("Content-Range: bytes %s/%" FORMAT_OFF_T "\r\n",
                    data->state.range, data->set.infilesize);
      }
      if(!conn->allocptr.rangeline)
        return CURLE_OUT_OF_MEMORY;
    }
  }

  /* Use 1.1 unless the user specifically asked for 1.0 or the server only
     supports 1.0 */
  httpstring= use_http_1_1(data, conn)?"1.1":"1.0";

  /* initialize a dynamic send-buffer */
  req_buffer = add_buffer_init();

  if(!req_buffer)
    return CURLE_OUT_OF_MEMORY;

  /* add the main request stuff */
  /* GET/HEAD/POST/PUT */
  result = add_bufferf(req_buffer, "%s ", request);
  if (result)
    return result;

  /* url */
  if (paste_ftp_userpwd)
    result = add_bufferf(req_buffer, "ftp://%s:%s@%s",
        conn->user, conn->passwd, ppath + sizeof("ftp://") - 1);
  else
    result = add_buffer(req_buffer, ppath, strlen(ppath));
  if (result)
    return result;

  result = add_bufferf(req_buffer,
                "%s" /* ftp typecode (;type=x) */
                " HTTP/%s\r\n" /* HTTP version */
                "%s" /* proxyuserpwd */
                "%s" /* userpwd */
                "%s" /* range */
                "%s" /* user agent */
                "%s" /* host */
                "%s" /* accept */
                "%s" /* accept-encoding */
                "%s" /* referer */
                "%s" /* Proxy-Connection */
                "%s",/* transfer-encoding */

                ftp_typecode,
                httpstring,
                conn->allocptr.proxyuserpwd?
                conn->allocptr.proxyuserpwd:"",
                conn->allocptr.userpwd?conn->allocptr.userpwd:"",
                (data->state.use_range && conn->allocptr.rangeline)?
                conn->allocptr.rangeline:"",
                (data->set.str[STRING_USERAGENT] &&
                 *data->set.str[STRING_USERAGENT] && conn->allocptr.uagent)?
                conn->allocptr.uagent:"",
                (conn->allocptr.host?conn->allocptr.host:""), /* Host: host */
                http->p_accept?http->p_accept:"",
                (data->set.str[STRING_ENCODING] &&
                 *data->set.str[STRING_ENCODING] &&
                 conn->allocptr.accept_encoding)?
                conn->allocptr.accept_encoding:"",
                (data->change.referer && conn->allocptr.ref)?
                conn->allocptr.ref:"" /* Referer: <data> */,
                (conn->bits.httpproxy &&
                 !conn->bits.tunnel_proxy &&
                 !checkheaders(data, "Proxy-Connection:"))?
                "Proxy-Connection: Keep-Alive\r\n":"",
                te
      );

  /*
   * Free userpwd now --- cannot reuse this for Negotiate and possibly NTLM
   * with basic and digest, it will be freed anyway by the next request
   */

  Curl_safefree (conn->allocptr.userpwd);
  conn->allocptr.userpwd = NULL;

  if(result)
    return result;

#if !defined(CURL_DISABLE_COOKIES)
  if(data->cookies || addcookies) {
    struct Cookie *co=NULL; /* no cookies from start */
    int count=0;

    if(data->cookies) {
      Curl_share_lock(data, CURL_LOCK_DATA_COOKIE, CURL_LOCK_ACCESS_SINGLE);
      co = Curl_cookie_getlist(data->cookies,
                               conn->allocptr.cookiehost?
                               conn->allocptr.cookiehost:host,
                               data->state.path,
                               (bool)(conn->protocol&PROT_HTTPS?TRUE:FALSE));
      Curl_share_unlock(data, CURL_LOCK_DATA_COOKIE);
    }
    if(co) {
      struct Cookie *store=co;
      /* now loop through all cookies that matched */
      while(co) {
        if(co->value) {
          if(0 == count) {
            result = add_bufferf(req_buffer, "Cookie: ");
            if(result)
              break;
          }
          result = add_bufferf(req_buffer,
                               "%s%s=%s", count?"; ":"",
                               co->name, co->value);
          if(result)
            break;
          count++;
        }
        co = co->next; /* next cookie please */
      }
      Curl_cookie_freelist(store, FALSE); /* free the cookie list */
    }
    if(addcookies && (CURLE_OK == result)) {
      if(!count)
        result = add_bufferf(req_buffer, "Cookie: ");
      if(CURLE_OK == result) {
        result = add_bufferf(req_buffer, "%s%s",
                             count?"; ":"",
                             addcookies);
        count++;
      }
    }
    if(count && (CURLE_OK == result))
      result = add_buffer(req_buffer, "\r\n", 2);

    if(result)
      return result;
  }
#endif

  if(data->set.timecondition) {
    struct tm *tm;

    /* The If-Modified-Since header family should have their times set in
     * GMT as RFC2616 defines: "All HTTP date/time stamps MUST be
     * represented in Greenwich Mean Time (GMT), without exception. For the
     * purposes of HTTP, GMT is exactly equal to UTC (Coordinated Universal
     * Time)." (see page 20 of RFC2616).
     */

#ifdef HAVE_GMTIME_R
    /* thread-safe version */
    struct tm keeptime;
    tm = (struct tm *)gmtime_r(&data->set.timevalue, &keeptime);
#else
    tm = gmtime(&data->set.timevalue);
#endif

    /* format: "Tue, 15 Nov 1994 12:45:26 GMT" */
    snprintf(buf, BUFSIZE-1,
             "%s, %02d %s %4d %02d:%02d:%02d GMT",
             Curl_wkday[tm->tm_wday?tm->tm_wday-1:6],
             tm->tm_mday,
             Curl_month[tm->tm_mon],
             tm->tm_year + 1900,
             tm->tm_hour,
             tm->tm_min,
             tm->tm_sec);

    switch(data->set.timecondition) {
    case CURL_TIMECOND_IFMODSINCE:
    default:
      result = add_bufferf(req_buffer,
                           "If-Modified-Since: %s\r\n", buf);
      break;
    case CURL_TIMECOND_IFUNMODSINCE:
      result = add_bufferf(req_buffer,
                           "If-Unmodified-Since: %s\r\n", buf);
      break;
    case CURL_TIMECOND_LASTMOD:
      result = add_bufferf(req_buffer,
                           "Last-Modified: %s\r\n", buf);
      break;
    }
    if(result)
      return result;
  }

  result = add_custom_headers(conn, req_buffer);
  if(result)
    return result;

  http->postdata = NULL;  /* nothing to post at this point */
  Curl_pgrsSetUploadSize(data, 0); /* upload size is 0 atm */

  /* If 'authdone' is FALSE, we must not set the write socket index to the
     Curl_transfer() call below, as we're not ready to actually upload any
     data yet. */

  switch(httpreq) {

  case HTTPREQ_POST_FORM:
    if(!http->sendit || conn->bits.authneg) {
      /* nothing to post! */
      result = add_bufferf(req_buffer, "Content-Length: 0\r\n\r\n");
      if(result)
        return result;

      result = add_buffer_send(req_buffer, conn,
                               &data->info.request_size, 0, FIRSTSOCKET);
      if(result)
        failf(data, "Failed sending POST request");
      else
        /* setup variables for the upcoming transfer */
        result = Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
                                     &http->readbytecount,
                                     -1, NULL);
      break;
    }

    if(Curl_FormInit(&http->form, http->sendit)) {
      failf(data, "Internal HTTP POST error!");
      return CURLE_HTTP_POST_ERROR;
    }

    /* Get the currently set callback function pointer and store that in the
       form struct since we might want the actual user-provided callback later
       on. The conn->fread_func pointer itself will be changed for the
       multipart case to the function that returns a multipart formatted
       stream. */
    http->form.fread_func = conn->fread_func;

    /* Set the read function to read from the generated form data */
    conn->fread_func = (curl_read_callback)Curl_FormReader;
    conn->fread_in = &http->form;

    http->sending = HTTPSEND_BODY;

    if(!data->req.upload_chunky) {
      /* only add Content-Length if not uploading chunked */
      result = add_bufferf(req_buffer,
                           "Content-Length: %" FORMAT_OFF_T "\r\n",
                           http->postsize);
      if(result)
        return result;
    }

    result = expect100(data, conn, req_buffer);
    if(result)
      return result;

    {

      /* Get Content-Type: line from Curl_formpostheader.
       */
      char *contentType;
      size_t linelength=0;
      contentType = Curl_formpostheader((void *)&http->form,
                                        &linelength);
      if(!contentType) {
        failf(data, "Could not get Content-Type header line!");
        return CURLE_HTTP_POST_ERROR;
      }

      result = add_buffer(req_buffer, contentType, linelength);
      if(result)
        return result;
    }

    /* make the request end in a true CRLF */
    result = add_buffer(req_buffer, "\r\n", 2);
    if(result)
      return result;

    /* set upload size to the progress meter */
    Curl_pgrsSetUploadSize(data, http->postsize);

    /* fire away the whole request to the server */
    result = add_buffer_send(req_buffer, conn,
                             &data->info.request_size, 0, FIRSTSOCKET);
    if(result)
      failf(data, "Failed sending POST request");
    else
      /* setup variables for the upcoming transfer */
      result = Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
                                   &http->readbytecount,
                                   FIRSTSOCKET,
                                   &http->writebytecount);

    if(result) {
      Curl_formclean(&http->sendit); /* free that whole lot */
      return result;
    }
#ifdef CURL_DOES_CONVERSIONS
/* time to convert the form data... */
    result = Curl_formconvert(data, http->sendit);
    if(result) {
      Curl_formclean(&http->sendit); /* free that whole lot */
      return result;
    }
#endif /* CURL_DOES_CONVERSIONS */
    break;

  case HTTPREQ_PUT: /* Let's PUT the data to the server! */

    if(conn->bits.authneg)
      postsize = 0;
    else
      postsize = data->set.infilesize;

    if((postsize != -1) && !data->req.upload_chunky) {
      /* only add Content-Length if not uploading chunked */
      result = add_bufferf(req_buffer,
                           "Content-Length: %" FORMAT_OFF_T "\r\n",
                           postsize );
      if(result)
        return result;
    }

    result = expect100(data, conn, req_buffer);
    if(result)
      return result;

    result = add_buffer(req_buffer, "\r\n", 2); /* end of headers */
    if(result)
      return result;

    /* set the upload size to the progress meter */
    Curl_pgrsSetUploadSize(data, postsize);

    /* this sends the buffer and frees all the buffer resources */
    result = add_buffer_send(req_buffer, conn,
                             &data->info.request_size, 0, FIRSTSOCKET);
    if(result)
      failf(data, "Failed sending PUT request");
    else
      /* prepare for transfer */
      result = Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
                                   &http->readbytecount,
                                   postsize?FIRSTSOCKET:-1,
                                   postsize?&http->writebytecount:NULL);
    if(result)
      return result;
    break;

  case HTTPREQ_POST:
    /* this is the simple POST, using x-www-form-urlencoded style */

    if(conn->bits.authneg)
      postsize = 0;
    else {
      /* figure out the size of the postfields */
      postsize = (data->set.postfieldsize != -1)?
        data->set.postfieldsize:
        (data->set.postfields? (curl_off_t)strlen(data->set.postfields):0);
    }
    if(!data->req.upload_chunky) {
      /* We only set Content-Length and allow a custom Content-Length if
         we don't upload data chunked, as RFC2616 forbids us to set both
         kinds of headers (Transfer-Encoding: chunked and Content-Length) */

      if(conn->bits.authneg || !checkheaders(data, "Content-Length:")) {
        /* we allow replacing this header if not during auth negotiation,
           although it isn't very wise to actually set your own */
        result = add_bufferf(req_buffer,
                             "Content-Length: %" FORMAT_OFF_T"\r\n",
                             postsize);
        if(result)
          return result;
      }
    }

    if(!checkheaders(data, "Content-Type:")) {
      result = add_bufferf(req_buffer,
                           "Content-Type: application/x-www-form-urlencoded\r\n");
      if(result)
        return result;
    }

    /* For really small posts we don't use Expect: headers at all, and for
       the somewhat bigger ones we allow the app to disable it. Just make
       sure that the expect100header is always set to the preferred value
       here. */
    if(postsize > TINY_INITIAL_POST_SIZE) {
      result = expect100(data, conn, req_buffer);
      if(result)
        return result;
    }
    else
      data->state.expect100header = FALSE;

    if(data->set.postfields) {

      if(!data->state.expect100header &&
         (postsize < MAX_INITIAL_POST_SIZE))  {
        /* if we don't use expect: 100  AND
           postsize is less than MAX_INITIAL_POST_SIZE

           then append the post data to the HTTP request header. This limit
           is no magic limit but only set to prevent really huge POSTs to
           get the data duplicated with malloc() and family. */

        result = add_buffer(req_buffer, "\r\n", 2); /* end of headers! */
        if(result)
          return result;

        if(!data->req.upload_chunky) {
          /* We're not sending it 'chunked', append it to the request
             already now to reduce the number if send() calls */
          result = add_buffer(req_buffer, data->set.postfields,
                              (size_t)postsize);
          included_body = postsize;
        }
        else {
          /* Append the POST data chunky-style */
          result = add_bufferf(req_buffer, "%x\r\n", (int)postsize);
          if(CURLE_OK == result)
            result = add_buffer(req_buffer, data->set.postfields,
                                (size_t)postsize);
          if(CURLE_OK == result)
            result = add_buffer(req_buffer,
                                "\x0d\x0a\x30\x0d\x0a\x0d\x0a", 7);
          /* CR  LF   0  CR  LF  CR  LF */
          included_body = postsize + 7;
        }
        if(result)
          return result;
      }
      else {
        /* A huge POST coming up, do data separate from the request */
        http->postsize = postsize;
        http->postdata = data->set.postfields;

        http->sending = HTTPSEND_BODY;

        conn->fread_func = (curl_read_callback)readmoredata;
        conn->fread_in = (void *)conn;

        /* set the upload size to the progress meter */
        Curl_pgrsSetUploadSize(data, http->postsize);

        result = add_buffer(req_buffer, "\r\n", 2); /* end of headers! */
        if(result)
          return result;
      }
    }
    else {
      result = add_buffer(req_buffer, "\r\n", 2); /* end of headers! */
      if(result)
        return result;

      if(data->set.postfieldsize) {
        /* set the upload size to the progress meter */
        Curl_pgrsSetUploadSize(data, postsize?postsize:-1);

        /* set the pointer to mark that we will send the post body using the
           read callback, but only if we're not in authenticate
           negotiation  */
        if(!conn->bits.authneg) {
          http->postdata = (char *)&http->postdata;
          http->postsize = postsize;
        }
      }
    }
    /* issue the request */
    result = add_buffer_send(req_buffer, conn, &data->info.request_size,
                             (size_t)included_body, FIRSTSOCKET);

    if(result)
      failf(data, "Failed sending HTTP POST request");
    else
      result =
        Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
                            &http->readbytecount,
                            http->postdata?FIRSTSOCKET:-1,
                            http->postdata?&http->writebytecount:NULL);
    break;

  default:
    result = add_buffer(req_buffer, "\r\n", 2);
    if(result)
      return result;

    /* issue the request */
    result = add_buffer_send(req_buffer, conn,
                             &data->info.request_size, 0, FIRSTSOCKET);

    if(result)
      failf(data, "Failed sending HTTP request");
    else
      /* HTTP GET/HEAD download: */
      result = Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
                                   &http->readbytecount,
                                   http->postdata?FIRSTSOCKET:-1,
                                   http->postdata?&http->writebytecount:NULL);
  }
  if(result)
    return result;

  if(http->writebytecount) {
    /* if a request-body has been sent off, we make sure this progress is noted
       properly */
    Curl_pgrsSetUploadCounter(data, http->writebytecount);
    if(Curl_pgrsUpdate(conn))
      result = CURLE_ABORTED_BY_CALLBACK;
  }

  return result;
}
#endif