aboutsummaryrefslogtreecommitdiff
path: root/lib/http.c
blob: 0dcaf78664c202412cc501753140fe67c4732dc2 (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
/***************************************************************************
 *                                  _   _ ____  _     
 *  Project                     ___| | | |  _ \| |    
 *                             / __| | | | |_) | |    
 *                            | (__| |_| |  _ <| |___ 
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2004, 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>
#include <sys/types.h>
#include <sys/stat.h>

#include <errno.h>

#if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
#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
#include <sys/time.h>

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

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

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

#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif


#endif

#include "urldata.h"
#include <curl/curl.h>
#include "transfer.h"
#include "sendf.h"
#include "formdata.h"
#include "progress.h"
#include "base64.h"
#include "cookie.h"
#include "strequal.h"
#include "ssluse.h"
#include "http_digest.h"
#include "http_ntlm.h"
#include "http_negotiate.h"
#include "url.h"
#include "share.h"
#include "http.h"

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

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

static CURLcode Curl_output_basic_proxy(struct connectdata *conn);

/*
 * This function checks the linked list of custom HTTP headers for a particular
 * header (prefix).
 */
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(strnequal(head->data, thisheader, thislen))
      return head->data;
  }
  return NULL;
}

static CURLcode Curl_output_basic(struct connectdata *conn)
{
  char *authorization;
  struct SessionHandle *data=conn->data;

  sprintf(data->state.buffer, "%s:%s", conn->user, conn->passwd);
  if(Curl_base64_encode(data->state.buffer, strlen(data->state.buffer),
                        &authorization) >= 0) {
    if(conn->allocptr.userpwd)
      free(conn->allocptr.userpwd);
    conn->allocptr.userpwd = aprintf( "Authorization: Basic %s\015\012",
                                      authorization);
    free(authorization);
  }
  else
    return CURLE_OUT_OF_MEMORY;
  return CURLE_OK;
}

static CURLcode Curl_output_basic_proxy(struct connectdata *conn)
{
  char *authorization;
  struct SessionHandle *data=conn->data;

  sprintf(data->state.buffer, "%s:%s",
          conn->proxyuser, conn->proxypasswd);
  if(Curl_base64_encode(data->state.buffer, strlen(data->state.buffer),
                        &authorization) >= 0) {
    Curl_safefree(conn->allocptr.proxyuserpwd);
    conn->allocptr.proxyuserpwd =
      aprintf("Proxy-authorization: Basic %s\015\012", authorization);
    free(authorization);
  }
  else
    return CURLE_OUT_OF_MEMORY;
  return CURLE_OK;
}

/*
 * Curl_http_auth_act() checks what authentication methods that are available
 * and decides which one (if any) to use. It will set 'newurl' if an auth
 * metod was picked.
 */

void Curl_http_auth_act(struct connectdata *conn)
{
  struct SessionHandle *data = conn->data;

  if(data->state.authavail) {
    /* The order of these checks is highly relevant, as this will be the order
       of preference in case of the existance of multiple accepted types. */
    if(data->state.authavail & CURLAUTH_GSSNEGOTIATE)
      data->state.authwant = CURLAUTH_GSSNEGOTIATE;
    else if(data->state.authavail & CURLAUTH_DIGEST)
      data->state.authwant = CURLAUTH_DIGEST;
    else if(data->state.authavail & CURLAUTH_NTLM)
      data->state.authwant = CURLAUTH_NTLM;
    else if(data->state.authavail & CURLAUTH_BASIC)
      data->state.authwant = CURLAUTH_BASIC;
    else
      data->state.authwant = CURLAUTH_NONE; /* clear it */

    if(data->state.authwant)
      conn->newurl = strdup(data->change.url); /* clone URL */
    data->state.authavail = CURLAUTH_NONE; /* clear it here */
  }
}

/*
 * Setup the authentication headers for the host/proxy and the correct
 * authentication method.
 */

CURLcode http_auth_headers(struct connectdata *conn,
                           char *request,
                           char *path,
                           bool *ready) /* set TRUE when the auth phase is
                                           done and ready to do the *actual*
                                           request */
{
  CURLcode result = CURLE_OK;
  struct SessionHandle *data = conn->data;
  char *auth=NULL;

  *ready = FALSE; /* default is no */

  if(!data->state.authstage) {
    if(conn->bits.httpproxy && conn->bits.proxy_user_passwd)
      Curl_http_auth_stage(data, 407);
    else if(conn->bits.user_passwd)
      Curl_http_auth_stage(data, 401);
    else {
      *ready = TRUE;
      return CURLE_OK; /* no authentication with no user or password */
    }
  }

  /* 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 ||
     !data->state.auth_host ||
     curl_strequal(data->state.auth_host, conn->hostname) ||
     data->set.http_disable_hostname_check_before_authentication) {

  /* Send proxy authentication header if needed */
    if (data->state.authstage == 407) {
#ifdef USE_SSLEAY
      if(data->state.authwant == CURLAUTH_NTLM) {
        auth=(char *)"NTLM";
        result = Curl_output_ntlm(conn, TRUE, ready);
        if(result)
          return result;
      }
      else
#endif
      if(data->state.authwant == CURLAUTH_BASIC) {
        /* Basic */
        if(conn->bits.proxy_user_passwd &&
           !checkheaders(data, "Proxy-authorization:")) {
          auth=(char *)"Basic";
          result = Curl_output_basic_proxy(conn);
          if(result)
            return result;
        }
        *ready = TRUE;
        /* Switch to web authentication after proxy authentication is done */
        Curl_http_auth_stage(data, 401);
      }
      infof(data, "Proxy auth using %s with user '%s'\n",
            auth, conn->proxyuser?conn->proxyuser:"");
    }
    /* Send web authentication header if needed */
    if (data->state.authstage == 401) {
      auth = NULL;
#ifdef HAVE_GSSAPI
      if((data->state.authwant == CURLAUTH_GSSNEGOTIATE) &&
         data->state.negotiate.context && 
         !GSS_ERROR(data->state.negotiate.status)) {
        auth=(char *)"GSS-Negotiate";
        result = Curl_output_negotiate(conn);
        if (result)
          return result;
        *ready = TRUE;
      }
      else
#endif
#ifdef USE_SSLEAY
      if(data->state.authwant == CURLAUTH_NTLM) {
        auth=(char *)"NTLM";
        result = Curl_output_ntlm(conn, FALSE, ready);
        if(result)
          return result;
      }
      else
#endif
      {
        if((data->state.authwant == CURLAUTH_DIGEST) &&
           data->state.digest.nonce) {
          auth=(char *)"Digest";
          result = Curl_output_digest(conn,
                                      (unsigned char *)request,
                                      (unsigned char *)path);
          if(result)
            return result;
          *ready = TRUE;
        }
        else if(data->state.authwant == CURLAUTH_BASIC) {/* Basic */
          if(conn->bits.user_passwd &&
             !checkheaders(data, "Authorization:")) {
            auth=(char *)"Basic";
            result = Curl_output_basic(conn);
            if(result)
              return result;
          }
          /* basic is always ready */
          *ready = TRUE;
        }
      }
      if(auth)
        infof(data, "Server auth using %s with user '%s'\n",
              auth, conn->user);
    }
  }
  else
    *ready = TRUE;

  return result;
}


/*
 * Curl_http_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_auth(struct connectdata *conn,
                        int httpcode,
                        char *header) /* pointing to the first non-space */
{
  /*
   * This resource requires authentication
   */
  struct SessionHandle *data = conn->data;

  long *availp;
  char *start;

  if (httpcode == 407) {
    start = header+strlen("Proxy-authenticate:");
    availp = &data->info.proxyauthavail;
  }
  else {
    start = header+strlen("WWW-Authenticate:");
    availp = &data->info.httpauthavail;
  }
  /*
   * Switch from proxy to web authentication and back if needed
   */
  if (httpcode == 407 && data->state.authstage != 407)
    Curl_http_auth_stage(data, 407);
              
  else if (httpcode == 401 && data->state.authstage != 401)
    Curl_http_auth_stage(data, 401);

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

  /*
   * Here we check if we want the specific single authentiction (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 authenticaion type to the authavail
   * variable.
   */
  
#ifdef HAVE_GSSAPI
  if (checkprefix("GSS-Negotiate", start) ||
      checkprefix("Negotiate", start)) {
    *availp |= CURLAUTH_GSSNEGOTIATE;
    if(data->state.authwant == CURLAUTH_GSSNEGOTIATE) {
      /* if exactly this is wanted, go */
      int neg = Curl_input_negotiate(conn, start);
      if (neg == 0)
        conn->newurl = strdup(data->change.url);
    }
    else
      if(data->state.authwant & CURLAUTH_GSSNEGOTIATE)
        data->state.authavail |= CURLAUTH_GSSNEGOTIATE;
  }
  else
#endif
#ifdef USE_SSLEAY
    /* NTLM support requires the SSL crypto libs */
    if(checkprefix("NTLM", start)) {
      *availp |= CURLAUTH_NTLM;
      if(data->state.authwant == CURLAUTH_NTLM) {
        /* NTLM authentication is activated */
        CURLntlm ntlm =
          Curl_input_ntlm(conn, (bool)(httpcode == 407), start);
                  
        if(CURLNTLM_BAD != ntlm)
          conn->newurl = strdup(data->change.url); /* clone string */
        else
          infof(data, "Authentication problem. Ignoring this.\n");
      }
      else
        if(data->state.authwant & CURLAUTH_NTLM)
          data->state.authavail |= CURLAUTH_NTLM;
    }
    else
#endif
      if(checkprefix("Digest", start)) {
        *availp |= CURLAUTH_DIGEST;
        if(data->state.authwant == CURLAUTH_DIGEST) {
          /* Digest authentication is activated */
          CURLdigest dig = CURLDIGEST_BAD;

          if(data->state.digest.nonce)
            infof(data, "Authentication problem. Ignoring this.\n");
          else
            dig = Curl_input_digest(conn, start);
          
          if(CURLDIGEST_FINE == dig)
            /* We act on it. Store our new url, which happens to be
               the same one we already use! */
            conn->newurl = strdup(data->change.url); /* clone string */
        }
        else
          if(data->state.authwant & CURLAUTH_DIGEST) {
            /* We don't know if Digest is what we're gonna use, but we
               call this function anyway to store the digest data that
               is provided on this line, to skip the extra round-trip
               we need to do otherwise. We must sure to free this
               data! */
            Curl_input_digest(conn, start);
            data->state.authavail |= CURLAUTH_DIGEST;
          }
      }
      else if(checkprefix("Basic", start)) {
        *availp |= CURLAUTH_BASIC;
        if((data->state.authwant == CURLAUTH_BASIC) &&
           (httpcode == data->state.authstage)) {
          /* We asked for Basic authentication but got a 40X back
             anyway, which basicly means our name+password isn't
             valid. */
          data->state.authavail = CURLAUTH_NONE;
          infof(data, "Authentication problem. Ignoring this.\n");
        }
        else if(data->state.authwant & CURLAUTH_BASIC) {
          data->state.authavail |= CURLAUTH_BASIC;
        }
      }
  return CURLE_OK;
}


/* fread() emulation to provide POST and/or request data */
static int readmoredata(char *buffer,
                        size_t size,
                        size_t nitems,
                        void *userp)
{
  struct connectdata *conn = (struct connectdata *)userp;
  struct HTTP *http = conn->proto.http;
  int fullsize = size * nitems;

  if(0 == http->postsize)
    /* nothing to return */
    return 0;
  
  /* make sure that a HTTP request is never sent away chunked! */
  conn->bits.forbidchunk= (http->sending == HTTPSEND_REQUEST)?TRUE:FALSE;

  if(http->postsize <= fullsize) {
    memcpy(buffer, http->postdata, http->postsize);
    fullsize = 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 =    http->backup.fread;
      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_buffer(send_buffer *in, const void *inptr, size_t size);

/*
 * add_buffer_init() returns a fine buffer struct
 */
static
send_buffer *add_buffer_init(void)
{
  send_buffer *blonk;
  blonk=(send_buffer *)malloc(sizeof(send_buffer));
  if(blonk) {
    memset(blonk, 0, sizeof(send_buffer));
    return blonk;
  }
  return NULL; /* failed, go home */
}

/*
 * add_buffer_send() sends a buffer and frees all associated memory.
 */
static
CURLcode add_buffer_send(send_buffer *in,
                         struct connectdata *conn,
                         long *bytes_written) /* add the number of sent
                                                 bytes to this counter */
{
  ssize_t amount;
  CURLcode res;
  char *ptr;
  int size;
  struct HTTP *http = conn->proto.http;
  int sendsize;
  int sockfd = conn->sock[FIRSTSOCKET];

  /* 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;

  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) {

    if(conn->data->set.verbose)
      /* this data _may_ contain binary stuff */
      Curl_debug(conn->data, CURLINFO_HEADER_OUT, ptr, amount);

    *bytes_written += amount;
    
    if(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 = conn->fread;
      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 = (curl_read_callback)readmoredata;
      conn->fread_in = (void *)conn;
      http->postdata = ptr;
      http->postsize = 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 */
  }
  if(in->buffer)
    free(in->buffer);
  free(in);

  return res;
}


/* 
 * add_bufferf() builds a buffer from the formatted input
 */
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);
    if(CURLE_OK == result)
      return CURLE_OK;
  }
  /* 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 one
 */
static
CURLcode add_buffer(send_buffer *in, const void *inptr, size_t size)
{
  char *new_rb;
  int new_size;

  if(!in->buffer ||
     ((in->size_used + size) > (in->size_max - 1))) {
    new_size = (in->size_used+size)*2;
    if(in->buffer)
      /* we have a buffer, enlarge the existing one */
      new_rb = (char *)realloc(in->buffer, new_size);
    else
      /* create a new buffer */
      new_rb = (char *)malloc(new_size);

    if(!new_rb)
      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(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;
  char *start;
  char *end;

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

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

  /* pass all white spaces */
  while(*start && isspace((int)*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(strnequal(start, content, clen))
      return TRUE; /* match! */
  }

  return FALSE; /* no match */
}

/*
 * ConnectHTTPProxyTunnel() 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.
 */

CURLcode Curl_ConnectHTTPProxyTunnel(struct connectdata *conn,
                                     int sockindex,
                                     char *hostname,
                                     int remote_port)
{
  int httpcode=0;
  int subversion=0;
  struct SessionHandle *data=conn->data;
  CURLcode result;
  int res;

  int nread;   /* total size read */
  int perline; /* count bytes per line */
  bool keepon=TRUE;
  ssize_t gotbytes;
  char *ptr;
  int timeout = 3600; /* default timeout in seconds */
  struct timeval interval;
  fd_set rkeepfd;
  fd_set readfd;
  char *line_start;
  char *host_port;
  int tunnelsocket = conn->sock[sockindex];

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

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

  do {
    bool auth; /* we don't really have to know when the auth phase is done,
                  but this variable will be set to true then */

    if(conn->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(conn->newurl); 
      conn->newurl = NULL;
    }

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

    /* Setup the proxy-authorization header, if any */
    result = http_auth_headers(conn, (char *)"CONNECT", host_port, &auth);
    if(CURLE_OK == result) {

      /* OK, now send the connect request to the proxy */
      result =
        Curl_sendf(tunnelsocket, conn,
                   "CONNECT %s:%d HTTP/1.0\015\012"
                   "%s"
                   "%s"
                   "\r\n",
                   hostname, remote_port,
                   conn->bits.proxy_user_passwd?
                   conn->allocptr.proxyuserpwd:"",
                   data->set.useragent?conn->allocptr.uagent:""
                   );
      if(result)
        failf(data, "Failed sending CONNECT to proxy");
    }
    free(host_port);
    if(result)
      return result;

    FD_ZERO (&readfd);		/* clear it */
    FD_SET (tunnelsocket, &readfd);     /* read socket */

    /* get this in a backup variable to be able to restore it on each lap in
       the select() loop */
    rkeepfd = readfd;

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

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

    while((nread<BUFSIZE) && (keepon && !error)) {
      readfd = rkeepfd;     /* set every lap */
      interval.tv_sec = 1;  /* timeout each second and check the timeout */
      interval.tv_usec = 0;

      if(data->set.timeout) {
        /* if timeout is requested, find out how much remaining time we have */
        timeout = data->set.timeout - /* timeout time */
          Curl_tvdiff(Curl_tvnow(), conn->now)/1000; /* spent time */
        if(timeout <=0 ) {
          failf(data, "Proxy connection aborted due to timeout");
          error = SELECT_TIMEOUT; /* already too little time */
          break;
        }
      }
      
      switch (select (tunnelsocket+1, &readfd, NULL, NULL, &interval)) {
      case -1: /* select() error, stop reading */
        error = SELECT_ERROR;
        failf(data, "Proxy CONNECT aborted due to select() error");
        break;
      case 0: /* timeout */
        break;
      default:
        /*
         * This code previously didn't use the kerberos sec_read() code
         * to read, but when we use Curl_read() it may do so. Do confirm
         * that this is still ok and then remove this comment!
         */
        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;
          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.
           *
           * TODO: To make this code work less error-prone, we need to make
           * sure that we read and create full lines before we compare them,
           * as there is really nothing that stops the proxy from delivering
           * the response lines in multiple parts, each part consisting of
           * only a little piece of the line(s).  */
          int i;

          nread += gotbytes;
          for(i = 0; i < gotbytes; ptr++, i++) {
            perline++; /* amount of bytes in this line so far */
            if(*ptr=='\n') {
              char letter;
              int writetype;
            
              /* output debug output if that is requested */
              if(data->set.verbose)
                Curl_debug(data, CURLINFO_HEADER_IN, line_start, perline);

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

              result = Curl_client_write(data, 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 */
                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 == httpcode)) ||
                 (checkprefix("Proxy-authenticate:", line_start) &&
                  (407 == httpcode))) {
                result = Curl_http_auth(conn, httpcode, line_start);
                if(result)
                  return result;
              }
              else if(2 == sscanf(line_start, "HTTP/1.%d %d",
                                  &subversion,
                                  &httpcode)) {
                /* store the HTTP code */
                data->info.httpproxycode = 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 */
    } /* while there's buffer left and loop is requested */

    if(error)
      return CURLE_RECV_ERROR;

    /* Deal with the possibly already received authenticate headers. 'newurl'
       is set to a new URL if we must loop. */
    Curl_http_auth_act(conn);
  
  } while(conn->newurl);

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

  Curl_http_auth_stage(data, 401); /* move on to the host auth */

  infof (data, "Proxy replied OK to CONNECT request\n");
  return CURLE_OK;
}

/*
 * HTTP stuff to do at connect-time.
 */
CURLcode Curl_http_connect(struct connectdata *conn)
{
  struct SessionHandle *data;
  CURLcode result;

  data=conn->data;

  /* 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
   * us to the host we want to talk to.  Only after the connect
   * has occured, can we start talking SSL
   */

  if(conn->bits.httpproxy &&
     ((conn->protocol & PROT_HTTPS) || data->set.tunnel_thru_httpproxy)) {

    /* either HTTPS over proxy, OR explicitly asked for a tunnel */
    result = Curl_ConnectHTTPProxyTunnel(conn, FIRSTSOCKET,
                                         conn->hostname, conn->remote_port);
    if(CURLE_OK != result)
      return result;
  }    

  if(conn->protocol & PROT_HTTPS) {
    /* now, perform the SSL initialization for this socket */
    result = Curl_SSLConnect(conn, FIRSTSOCKET);
    if(result)
      return result;
  }

  if(conn->bits.user_passwd && !data->state.this_is_a_follow) {
    /* Authorization: is requested, this is not a followed location, get the
       original host name */
    if (data->state.auth_host)
      /* Free to avoid leaking memory on multiple requests*/
      free(data->state.auth_host);

    data->state.auth_host = strdup(conn->hostname);
  }

  return CURLE_OK;
}

CURLcode Curl_http_done(struct connectdata *conn)
{
  struct SessionHandle *data;
  struct HTTP *http;

  data=conn->data;
  http=conn->proto.http;

  /* set the proper values (possibly modified on POST) */
  conn->fread = data->set.fread; /* restore */
  conn->fread_in = data->set.in; /* 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; /* cleaer the pointer */
  }

  if(HTTPREQ_POST_FORM == data->set.httpreq) {
    conn->bytecount = http->readbytecount + http->writebytecount;
      
    Curl_formclean(http->sendit); /* Now free that whole lot */
  }
  else if(HTTPREQ_PUT == data->set.httpreq)
    conn->bytecount = http->readbytecount + http->writebytecount;

  if(0 == (http->readbytecount + conn->headerbytecount)) {
    /* nothing was read from the HTTP server, this can't be right
       so we return an error here */
    failf(data, "Empty reply from server");
    return CURLE_GOT_NOTHING;
  }

  return CURLE_OK;
}

void Curl_http_auth_stage(struct SessionHandle *data,
                          int stage)
{
  curlassert((stage == 401) || (stage == 407));

  /* We set none, one or more bits for which authentication types we accept
     for this stage. */
  data->state.authwant = (stage == 401)?
    data->set.httpauth:data->set.proxyauth;

  data->state.authstage = stage;
  data->state.authavail = CURLAUTH_NONE; /* no type available yet */
}

CURLcode Curl_http(struct connectdata *conn)
{
  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;
  struct Cookie *co=NULL; /* no cookies from start */
  char *ppath = conn->ppath; /* three previous function arguments */
  char *host = conn->name;
  const char *te = ""; /* tranfer-encoding */
  char *ptr;
  char *request;
  bool authdone=TRUE; /* if the authentication phase is done */
  Curl_HttpReq httpreq;  /* type of HTTP request */

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

    http = (struct HTTP *)malloc(sizeof(struct HTTP));
    if(!http)
      return CURLE_OUT_OF_MEMORY;
    memset(http, 0, sizeof(struct HTTP));
    conn->proto.http = http;
  }
  else
    http = conn->proto.http;

  /* We default to persistant connections */
  conn->bits.close = FALSE;

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

  request = data->set.customrequest?
    data->set.customrequest:
    (data->set.no_body?(char *)"HEAD":
     ((HTTPREQ_POST == data->set.httpreq) ||
      (HTTPREQ_POST_FORM == data->set.httpreq))?(char *)"POST":
     (HTTPREQ_PUT == data->set.httpreq)?(char *)"PUT":(char *)"GET");
  
  /* The User-Agent string has been built 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_auth_headers(conn, request, ppath, &authdone);
  if(result)
    return result;

  Curl_safefree(conn->allocptr.ref);
  if(data->change.referer && !checkheaders(data, "Referer:"))
    conn->allocptr.ref = aprintf("Referer: %s\015\012", data->change.referer);
  else
    conn->allocptr.ref = NULL;

  Curl_safefree(conn->allocptr.cookie);
  if(data->set.cookie && !checkheaders(data, "Cookie:"))
    conn->allocptr.cookie = aprintf("Cookie: %s\015\012", data->set.cookie);
  else
    conn->allocptr.cookie = NULL;

  if(!conn->bits.upload_chunky && (data->set.httpreq != HTTPREQ_GET)) {
    /* not a chunky transfer but data is to be sent */
    ptr = checkheaders(data, "Transfer-Encoding:");
    if(ptr) {
      /* Some kind of TE is requested, check if 'chunked' is chosen */
      if(Curl_compareheader(ptr, "Transfer-Encoding:", "chunked"))
        /* we have been told explicitly to upload chunky so deal with it! */
        conn->bits.upload_chunky = TRUE;
    }
  }

  if(conn->bits.upload_chunky) {
    /* RFC2616 section 4.4:
       Messages MUST NOT include both a Content-Length header field and a
       non-identity transfer-coding. If the message does include a non-
       identity transfer-coding, the Content-Length MUST be ignored. */

    if(!checkheaders(data, "Transfer-Encoding:")) {
      te = "Transfer-Encoding: chunked\r\n";
    }
    else {
      /* The "Transfer-Encoding:" header was already added. */
      te = "";
    }
  }

  ptr = checkheaders(data, "Host:");
  if(ptr) {
    /* If we have a given custom Host: header, we extract the host name
       in order to possibly use it for cookie reasons later on. */
    char *start = ptr+strlen("Host:");
    while(*start && isspace((int)*start ))
      start++;
    ptr = start; /* start host-scanning here */

    /* scan through the string to find the end (space or colon) */
    while(*ptr && !isspace((int)*ptr) && !(':'==*ptr))
      ptr++;
    
    if(ptr != start) {
      int len=ptr-start;
      conn->allocptr.cookiehost = malloc(len+1);
      if(!conn->allocptr.cookiehost)
        return CURLE_OUT_OF_MEMORY;
      memcpy(conn->allocptr.cookiehost, start, len);
      conn->allocptr.cookiehost[len]=0;
    }
  }    
  else {
    /* if ptr_host is already set, it is almost OK since we only re-use
       connections to the very same host and port, but when we use a HTTP
       proxy we have a persistant connect and yet we must change the Host:
       header! */

    if(conn->allocptr.host)
      free(conn->allocptr.host);

    /* 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;
  }

  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, ppath,
                             (bool)(conn->protocol&PROT_HTTPS?TRUE:FALSE));
    Curl_share_unlock(data, CURL_LOCK_DATA_COOKIE);
  }

  if (conn->bits.httpproxy &&
      !data->set.tunnel_thru_httpproxy &&
      !(conn->protocol&PROT_HTTPS))  {
    /* The path sent to the proxy is in fact the entire URL */
    ppath = data->change.url;
  }
  if(HTTPREQ_POST_FORM == data->set.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,
                               &http->postsize);
     if(CURLE_OK != result) {
       /* Curl_getFormData() doesn't use failf() */
       failf(data, "failed creating formpost data");
       return result;
     }
  }


  if(!checkheaders(data, "Pragma:"))
    http->p_pragma = "Pragma: no-cache\r\n";

  if(!checkheaders(data, "Accept:"))
    http->p_accept = "Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, */*\r\n";

  if(( (HTTPREQ_POST == data->set.httpreq) ||
       (HTTPREQ_POST_FORM == data->set.httpreq) ||
       (HTTPREQ_PUT == data->set.httpreq) ) &&
     conn->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(conn->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!
       */
       conn->resume_from = 0;
    }

    if(conn->resume_from) {
      /* do we still game? */
      curl_off_t passed=0;

      /* Now, let's read off the proper amount of bytes from the
         input. If we knew it was a proper file we could've just
         fseek()ed but we only have a stream here */
      do {
        curl_off_t readthisamountnow = (conn->resume_from - passed);
        curl_off_t actuallyread;

        if(readthisamountnow > BUFSIZE)
          readthisamountnow = BUFSIZE;

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

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

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

        if(data->set.infilesize <= 0) {
          failf(data, "File already completely uploaded");
          return CURLE_PARTIAL_FILE;
        }
      }
      /* we've passed, proceed as normal */
    }
  }
  if(conn->bits.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((data->set.httpreq == HTTPREQ_GET) &&
       !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", conn->range);
    }
    else if((data->set.httpreq != HTTPREQ_GET) &&
            !checkheaders(data, "Content-Range:")) {

      if(conn->resume_from) {
        /* This is because "resume" was selected */
        curl_off_t total_expected_size=
          conn->resume_from + data->set.infilesize;
        conn->allocptr.rangeline =
	    aprintf("Content-Range: bytes %s%Od/%Od\r\n",
		    conn->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/%Od\r\n",
		    conn->range, data->set.infilesize);
      }
    }
  }

  {
    /* Use 1.1 unless the use specificly asked for 1.0 */
    const char *httpstring=
      data->set.httpversion==CURL_HTTP_VERSION_1_0?"1.0":"1.1";

    send_buffer *req_buffer;
    struct curl_slist *headers=data->set.headers;
    size_t postsize;

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

    if(!req_buffer)
      return CURLE_OUT_OF_MEMORY;

    /* add the main request stuff */
    result =
      add_bufferf(req_buffer,
                  "%s " /* GET/HEAD/POST/PUT */
                  "%s HTTP/%s\r\n" /* path + HTTP version */
                  "%s" /* proxyuserpwd */
                  "%s" /* userpwd */
                  "%s" /* range */
                  "%s" /* user agent */
                  "%s" /* cookie */
                  "%s" /* host */
                  "%s" /* pragma */
                  "%s" /* accept */
                  "%s" /* accept-encoding */
                  "%s" /* referer */
                  "%s",/* transfer-encoding */

                request,
                ppath,
                httpstring,
                (conn->bits.httpproxy && conn->allocptr.proxyuserpwd)?
                conn->allocptr.proxyuserpwd:"",
                conn->allocptr.userpwd?conn->allocptr.userpwd:"",
                (conn->bits.use_range && conn->allocptr.rangeline)?
                conn->allocptr.rangeline:"",
                (data->set.useragent && *data->set.useragent && conn->allocptr.uagent)?
                conn->allocptr.uagent:"",
                (conn->allocptr.cookie?conn->allocptr.cookie:""), /* Cookie: <data> */
                (conn->allocptr.host?conn->allocptr.host:""), /* Host: host */
                http->p_pragma?http->p_pragma:"",
                http->p_accept?http->p_accept:"",
                (data->set.encoding && *data->set.encoding && conn->allocptr.accept_encoding)?
                conn->allocptr.accept_encoding:"", /* 08/28/02 jhrg */
                (data->change.referer && conn->allocptr.ref)?conn->allocptr.ref:"" /* Referer: <data> <CRLF> */,
                te
                );

    if(result)
      return result;

    if(co) {
      int count=0;
      struct Cookie *store=co;
      /* now loop through all cookies that matched */
      while(co) {
        if(co->value) {
          if(0 == count) {
            add_bufferf(req_buffer, "Cookie: ");
          }
          add_bufferf(req_buffer,
                      "%s%s=%s", count?"; ":"", co->name, co->value);
          count++;
        }
        co = co->next; /* next cookie please */
      }
      if(count) {
        add_buffer(req_buffer, "\r\n", 2);
      }
      Curl_cookie_freelist(store); /* free the cookie list */
      co=NULL;
    }

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

      /* Phil Karn (Fri, 13 Apr 2001) pointed out that 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;
      thistime = (struct tm *)gmtime_r(&data->set.timevalue, &keeptime);
#else
      thistime = gmtime(&data->set.timevalue);
#endif

#ifdef HAVE_STRFTIME
      /* format: "Tue, 15 Nov 1994 12:45:26 GMT" */
      strftime(buf, BUFSIZE-1, "%a, %d %b %Y %H:%M:%S GMT", thistime);
#else
      /* TODO: Right, we *could* write a replacement here */
      strcpy(buf, "no strftime() support");
#endif
      switch(data->set.timecondition) {
      case CURL_TIMECOND_IFMODSINCE:
      default:
        add_bufferf(req_buffer,
                    "If-Modified-Since: %s\r\n", buf);
        break;
      case CURL_TIMECOND_IFUNMODSINCE:
        add_bufferf(req_buffer,
                    "If-Unmodified-Since: %s\r\n", buf);
        break;
      case CURL_TIMECOND_LASTMOD:
        add_bufferf(req_buffer,
                    "Last-Modified: %s\r\n", buf);
        break;
      }
    }

    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((int)*ptr))
          ptr++;

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

          add_bufferf(req_buffer, "%s\r\n", headers->data);
        }
      }
      headers = headers->next;
    }

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

    if(!authdone)
      /* until the auth is done, pretend we only do GET */
      httpreq = HTTPREQ_GET;
    else
      httpreq = data->set.httpreq;

    switch(httpreq) {

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

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

      http->sending = HTTPSEND_BODY;

      if(!conn->bits.upload_chunky)
        /* only add Content-Length if not uploading chunked */
        add_bufferf(req_buffer,
                    "Content-Length: %d\r\n", http->postsize);

      if(!checkheaders(data, "Expect:")) {
        /* if not 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) */
        add_bufferf(req_buffer,
                    "Expect: 100-continue\r\n");
        data->set.expect100header = TRUE;
      }

      if(!checkheaders(data, "Content-Type:")) {
        /* Get Content-Type: line from Curl_FormReadOneLine, which happens
           to always be the first line. We can know this for sure since
           we always build the formpost linked list the same way!

           The Content-Type header line also contains the MIME boundary
           string etc why disabling this header is likely to not make things
           work, but we support it anyway.
        */
        char contentType[256];
        int linelength=0;
        linelength = Curl_FormReadOneLine (contentType,
                                           sizeof(contentType),
                                           1,
                                           (FILE *)&http->form);
        if(linelength == -1) {
          failf(data, "Could not get Content-Type header line!");
          return CURLE_HTTP_POST_ERROR;
        }
        add_buffer(req_buffer, contentType, linelength);
      }

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

      /* 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);
      if(result)
        failf(data, "Failed sending POST request");
      else
        /* setup variables for the upcoming transfer */
        result = Curl_Transfer(conn, FIRSTSOCKET, -1, TRUE,
                               &http->readbytecount,
                               FIRSTSOCKET,
                               &http->writebytecount);
      if(result) {
        Curl_formclean(http->sendit); /* free that whole lot */
        return result;
      }
      break;

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

      if((data->set.infilesize>0) && !conn->bits.upload_chunky)
        /* only add Content-Length if not uploading chunked */
        add_bufferf(req_buffer,
                    "Content-Length: %Od\r\n", /* file size */
                    data->set.infilesize );

      add_bufferf(req_buffer, "\r\n");

      /* set the upload size to the progress meter */
      Curl_pgrsSetUploadSize(data, (double)data->set.infilesize);

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

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

      /* store the size of the postfields */
      postsize = data->set.postfieldsize?
        data->set.postfieldsize:
        (data->set.postfields?strlen(data->set.postfields):0);
      
      if(!conn->bits.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(!checkheaders(data, "Content-Length:"))
          /* we allow replacing this header, although it isn't very wise to
             actually set your own */
          add_bufferf(req_buffer, "Content-Length: %d\r\n", postsize);
      }

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

      add_buffer(req_buffer, "\r\n", 2);

      if(data->set.postfields) {

        if(postsize < (100*1024)) {
          /* The post data is less than 100K, then append it to the header.
             This limit is no magic limit but only set to prevent really huge
             POSTs to get the data duplicated with malloc() and family. */

          if(!conn->bits.upload_chunky)
            /* We're not sending it 'chunked', append it to the request
               already now to reduce the number if send() calls */
            add_buffer(req_buffer, data->set.postfields, postsize);
          else {
            /* Append the POST data chunky-style */
            add_bufferf(req_buffer, "%x\r\n", postsize);
            add_buffer(req_buffer, data->set.postfields, postsize);
            add_buffer(req_buffer, "\r\n0\r\n", 5); /* end of a chunked
                                                       transfer stream */
          }
        }
        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 = (curl_read_callback)readmoredata;
          conn->fread_in = (void *)conn;

          /* set the upload size to the progress meter */
          Curl_pgrsSetUploadSize(data, http->postsize);
        }
      }
      else {
        /* set the upload size to the progress meter */
        Curl_pgrsSetUploadSize(data, (double)data->set.infilesize);

        /* set the pointer to mark that we will send the post body using
           the read callback */
        http->postdata = (char *)&http->postdata;
      }
      /* issue the request */
      result = add_buffer_send(req_buffer, conn,
                               &data->info.request_size);

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

    default:
      add_buffer(req_buffer, "\r\n", 2);
      
      /* issue the request */
      result = add_buffer_send(req_buffer, conn,
                               &data->info.request_size);

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

  return CURLE_OK;
}
#endif