Newer
Older
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
}
return APR_EGENERAL;
}
/*
* Determine the protocol to use for the response. Potentially downgrade
* to HTTP/1.0 in some situations and/or turn off keepalives.
*
* also prepare r->status_line.
*/
static void basic_http_header_check(request_rec *r,
const char **protocol)
{
apr_status_t rv;
if (r->assbackwards) {
/* no such thing as a response protocol */
return;
}
rv = validate_status_line(r);
if (!r->status_line) {
r->status_line = ap_get_status_line(r->status);
} else if (rv != APR_SUCCESS) {
/* Status line is OK but our own reason phrase
* would be preferred if defined
*/
const char *tmp = ap_get_status_line(r->status);
if (!strncmp(tmp, r->status_line, 3)) {
r->status_line = tmp;
}
}
/* Note that we must downgrade before checking for force responses. */
if (r->proto_num > HTTP_VERSION(1,0)
&& apr_table_get(r->subprocess_env, "downgrade-1.0")) {
r->proto_num = HTTP_VERSION(1,0);
}
/* kludge around broken browsers when indicated by force-response-1.0
*/
if (r->proto_num == HTTP_VERSION(1,0)
&& apr_table_get(r->subprocess_env, "force-response-1.0")) {
*protocol = "HTTP/1.0";
r->connection->keepalive = AP_CONN_CLOSE;
}
else {
*protocol = AP_SERVER_PROTOCOL;
}
}
/* fill "bb" with a barebones/initial HTTP response header */
static void basic_http_header(request_rec *r, apr_bucket_brigade *bb,
const char *protocol)
{
char *date = NULL;
const char *proxy_date = NULL;
const char *server = NULL;
const char *us = ap_get_server_banner();
header_struct h;
struct iovec vec[4];
if (r->assbackwards) {
/* there are no headers to send */
return;
}
/* Output the HTTP/1.x Status-Line and the Date and Server fields */
vec[0].iov_base = (void *)protocol;
vec[0].iov_len = strlen(protocol);
vec[1].iov_base = (void *)" ";
vec[1].iov_len = sizeof(" ") - 1;
vec[2].iov_base = (void *)(r->status_line);
vec[2].iov_len = strlen(r->status_line);
vec[3].iov_base = (void *)CRLF;
vec[3].iov_len = sizeof(CRLF) - 1;
#if APR_CHARSET_EBCDIC
{
char *tmp;
apr_size_t len;
tmp = apr_pstrcatv(r->pool, vec, 4, &len);
ap_xlate_proto_to_ascii(tmp, len);
apr_brigade_write(bb, NULL, NULL, tmp, len);
}
#else
apr_brigade_writev(bb, NULL, NULL, vec, 4);
#endif
h.pool = r->pool;
h.bb = bb;
/*
* keep the set-by-proxy server and date headers, otherwise
* generate a new server header / date header
*/
if (r->proxyreq != PROXYREQ_NONE) {
proxy_date = apr_table_get(r->headers_out, "Date");
if (!proxy_date) {
/*
* proxy_date needs to be const. So use date for the creation of
* our own Date header and pass it over to proxy_date later to
* avoid a compiler warning.
*/
date = apr_palloc(r->pool, APR_RFC822_DATE_LEN);
ap_recent_rfc822_date(date, r->request_time);
}
server = apr_table_get(r->headers_out, "Server");
}
else {
date = apr_palloc(r->pool, APR_RFC822_DATE_LEN);
ap_recent_rfc822_date(date, r->request_time);
}
form_header_field(&h, "Date", proxy_date ? proxy_date : date );
if (!server && *us)
server = us;
if (server)
form_header_field(&h, "Server", server);
if (APLOGrtrace3(r)) {
ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, r,
"Response sent with status %d%s",
r->status,
APLOGrtrace4(r) ? ", headers:" : "");
/*
* Date and Server are less interesting, use TRACE5 for them while
* using TRACE4 for the other headers.
*/
ap_log_rerror(APLOG_MARK, APLOG_TRACE5, 0, r, " Date: %s",
proxy_date ? proxy_date : date );
if (server)
ap_log_rerror(APLOG_MARK, APLOG_TRACE5, 0, r, " Server: %s",
server);
}
/* unset so we don't send them again */
apr_table_unset(r->headers_out, "Date"); /* Avoid bogosity */
if (server) {
apr_table_unset(r->headers_out, "Server");
}
}
AP_DECLARE(void) ap_basic_http_header(request_rec *r, apr_bucket_brigade *bb)
{
const char *protocol = NULL;
basic_http_header_check(r, &protocol);
basic_http_header(r, bb, protocol);
}
static void terminate_header(apr_bucket_brigade *bb)
{
char crlf[] = CRLF;
apr_size_t buflen;
buflen = strlen(crlf);
ap_xlate_proto_to_ascii(crlf, buflen);
apr_brigade_write(bb, NULL, NULL, crlf, buflen);
}
AP_DECLARE_NONSTD(int) ap_send_http_trace(request_rec *r)
{
core_server_config *conf;
int rv;
apr_bucket_brigade *bb;
header_struct h;
apr_bucket *b;
int body;
char *bodyread = NULL, *bodyoff;
apr_size_t bodylen = 0;
apr_size_t bodybuf;
long res = -1; /* init to avoid gcc -Wall warning */
if (r->method_number != M_TRACE) {
return DECLINED;
}
/* Get the original request */
while (r->prev) {
r = r->prev;
}
conf = ap_get_core_module_config(r->server->module_config);
if (conf->trace_enable == AP_TRACE_DISABLE) {
apr_table_setn(r->notes, "error-notes",
"TRACE denied by server configuration");
return HTTP_METHOD_NOT_ALLOWED;
}
if (conf->trace_enable == AP_TRACE_EXTENDED)
/* XXX: should be = REQUEST_CHUNKED_PASS */
body = REQUEST_CHUNKED_DECHUNK;
else
body = REQUEST_NO_BODY;
if ((rv = ap_setup_client_block(r, body))) {
if (rv == HTTP_REQUEST_ENTITY_TOO_LARGE)
apr_table_setn(r->notes, "error-notes",
"TRACE with a request body is not allowed");
return rv;
}
if (ap_should_client_block(r)) {
if (r->remaining > 0) {
if (r->remaining > 65536) {
apr_table_setn(r->notes, "error-notes",
"Extended TRACE request bodies cannot exceed 64k\n");
return HTTP_REQUEST_ENTITY_TOO_LARGE;
}
/* always 32 extra bytes to catch chunk header exceptions */
bodybuf = (apr_size_t)r->remaining + 32;
}
else {
/* Add an extra 8192 for chunk headers */
bodybuf = 73730;
}
bodyoff = bodyread = apr_palloc(r->pool, bodybuf);
/* only while we have enough for a chunked header */
while ((!bodylen || bodybuf >= 32) &&
(res = ap_get_client_block(r, bodyoff, bodybuf)) > 0) {
bodylen += res;
bodybuf -= res;
bodyoff += res;
}
if (res > 0 && bodybuf < 32) {
/* discard_rest_of_request_body into our buffer */
while (ap_get_client_block(r, bodyread, bodylen) > 0)
;
apr_table_setn(r->notes, "error-notes",
"Extended TRACE request bodies cannot exceed 64k\n");
return HTTP_REQUEST_ENTITY_TOO_LARGE;
}
if (res < 0) {
return HTTP_BAD_REQUEST;
}
}
ap_set_content_type(r, "message/http");
/* Now we recreate the request, and echo it back */
bb = apr_brigade_create(r->pool, r->connection->bucket_alloc);
#if APR_CHARSET_EBCDIC
{
char *tmp;
apr_size_t len;
len = strlen(r->the_request);
tmp = apr_pmemdup(r->pool, r->the_request, len);
ap_xlate_proto_to_ascii(tmp, len);
apr_brigade_putstrs(bb, NULL, NULL, tmp, CRLF_ASCII, NULL);
}
#else
apr_brigade_putstrs(bb, NULL, NULL, r->the_request, CRLF, NULL);
#endif
h.pool = r->pool;
h.bb = bb;
apr_table_do((int (*) (void *, const char *, const char *))
form_header_field, (void *) &h, r->headers_in, NULL);
apr_brigade_puts(bb, NULL, NULL, CRLF_ASCII);
/* If configured to accept a body, echo the body */
if (bodylen) {
b = apr_bucket_pool_create(bodyread, bodylen,
r->pool, bb->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(bb, b);
}
ap_pass_brigade(r->output_filters, bb);
return DONE;
}
typedef struct header_filter_ctx {
int headers_sent;
} header_filter_ctx;
AP_CORE_DECLARE_NONSTD(apr_status_t) ap_http_header_filter(ap_filter_t *f,
apr_bucket_brigade *b)
{
request_rec *r = f->r;
conn_rec *c = r->connection;
const char *clheader;
const char *protocol = NULL;
apr_bucket *e;
apr_bucket_brigade *b2;
header_struct h;
header_filter_ctx *ctx = f->ctx;
const char *ctype;
ap_bucket_error *eb = NULL;
apr_status_t rv = APR_SUCCESS;
int recursive_error = 0;
AP_DEBUG_ASSERT(!r->main);
if (!ctx) {
ctx = f->ctx = apr_pcalloc(r->pool, sizeof(header_filter_ctx));
}
else if (ctx->headers_sent) {
/* Eat body if response must not have one. */
if (r->header_only || r->status == HTTP_NO_CONTENT) {
apr_brigade_cleanup(b);
return APR_SUCCESS;
}
}
for (e = APR_BRIGADE_FIRST(b);
e != APR_BRIGADE_SENTINEL(b);
e = APR_BUCKET_NEXT(e))
{
if (AP_BUCKET_IS_ERROR(e) && !eb) {
eb = e->data;
continue;
}
/*
* If we see an EOC bucket it is a signal that we should get out
* of the way doing nothing.
*/
if (AP_BUCKET_IS_EOC(e)) {
ap_remove_output_filter(f);
return ap_pass_brigade(f->next, b);
}
}
if (!ctx->headers_sent && !check_headers(r)) {
/* We may come back here from ap_die() below,
* so clear anything from this response.
*/
apr_table_clear(r->headers_out);
apr_table_clear(r->err_headers_out);
apr_brigade_cleanup(b);
/* Don't recall ap_die() if we come back here (from its own internal
* redirect or error response), otherwise we can end up in infinite
* recursion; better fall through with 500, minimal headers and an
* empty body (EOS only).
*/
if (!check_headers_recursion(r)) {
ap_die(HTTP_INTERNAL_SERVER_ERROR, r);
return AP_FILTER_ERROR;
}
r->status = HTTP_INTERNAL_SERVER_ERROR;
e = ap_bucket_eoc_create(c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(b, e);
e = apr_bucket_eos_create(c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(b, e);
r->content_type = r->content_encoding = NULL;
r->content_languages = NULL;
ap_set_content_length(r, 0);
recursive_error = 1;
}
else if (eb) {
int status;
status = eb->status;
apr_brigade_cleanup(b);
ap_die(status, r);
return AP_FILTER_ERROR;
}
if (r->assbackwards) {
r->sent_bodyct = 1;
ap_remove_output_filter(f);
rv = ap_pass_brigade(f->next, b);
goto out;
}
/*
* Now that we are ready to send a response, we need to combine the two
* header field tables into a single table. If we don't do this, our
* later attempts to set or unset a given fieldname might be bypassed.
*/
if (!apr_is_empty_table(r->err_headers_out)) {
r->headers_out = apr_table_overlay(r->pool, r->err_headers_out,
r->headers_out);
}
/*
* Remove the 'Vary' header field if the client can't handle it.
* Since this will have nasty effects on HTTP/1.1 caches, force
* the response into HTTP/1.0 mode.
*
* Note: the force-response-1.0 should come before the call to
* basic_http_header_check()
*/
if (apr_table_get(r->subprocess_env, "force-no-vary") != NULL) {
apr_table_unset(r->headers_out, "Vary");
r->proto_num = HTTP_VERSION(1,0);
apr_table_setn(r->subprocess_env, "force-response-1.0", "1");
}
else {
fixup_vary(r);
}
/*
* Now remove any ETag response header field if earlier processing
* says so (such as a 'FileETag None' directive).
*/
if (apr_table_get(r->notes, "no-etag") != NULL) {
apr_table_unset(r->headers_out, "ETag");
}
/* determine the protocol and whether we should use keepalives. */
basic_http_header_check(r, &protocol);
ap_set_keepalive(r);
if (r->chunked) {
apr_table_mergen(r->headers_out, "Transfer-Encoding", "chunked");
apr_table_unset(r->headers_out, "Content-Length");
}
if (r->status == HTTP_NO_CONTENT) {
apr_table_unset(r->headers_out, "Content-Length");
}
ctype = ap_make_content_type(r, r->content_type);
if (ctype) {
apr_table_setn(r->headers_out, "Content-Type", ctype);
}
if (r->content_encoding) {
apr_table_setn(r->headers_out, "Content-Encoding",
r->content_encoding);
}
if (!apr_is_empty_array(r->content_languages)) {
int i;
char *token;
char **languages = (char **)(r->content_languages->elts);
const char *field = apr_table_get(r->headers_out, "Content-Language");
while (field && (token = ap_get_list_item(r->pool, &field)) != NULL) {
for (i = 0; i < r->content_languages->nelts; ++i) {
if (!strcasecmp(token, languages[i]))
break;
}
if (i == r->content_languages->nelts) {
*((char **) apr_array_push(r->content_languages)) = token;
}
}
field = apr_array_pstrcat(r->pool, r->content_languages, ',');
apr_table_setn(r->headers_out, "Content-Language", field);
}
/*
* Control cachability for non-cacheable responses if not already set by
* some other part of the server configuration.
*/
if (r->no_cache && !apr_table_get(r->headers_out, "Expires")) {
char *date = apr_palloc(r->pool, APR_RFC822_DATE_LEN);
ap_recent_rfc822_date(date, r->request_time);
apr_table_addn(r->headers_out, "Expires", date);
}
/* This is a hack, but I can't find anyway around it. The idea is that
* we don't want to send out 0 Content-Lengths if it is a head request.
* This happens when modules try to outsmart the server, and return
* if they see a HEAD request. Apache 1.3 handlers were supposed to
* just return in that situation, and the core handled the HEAD. In
* 2.0, if a handler returns, then the core sends an EOS bucket down
* the filter stack, and the content-length filter computes a C-L of
* zero and that gets put in the headers, and we end up sending a
* zero C-L to the client. We can't just remove the C-L filter,
* because well behaved 2.0 handlers will send their data down the stack,
* and we will compute a real C-L for the head request. RBB
*/
if (r->header_only
&& (clheader = apr_table_get(r->headers_out, "Content-Length"))
&& !strcmp(clheader, "0")) {
apr_table_unset(r->headers_out, "Content-Length");
}
b2 = apr_brigade_create(r->pool, c->bucket_alloc);
basic_http_header(r, b2, protocol);
h.pool = r->pool;
h.bb = b2;
if (r->status == HTTP_NOT_MODIFIED) {
apr_table_do((int (*)(void *, const char *, const char *)) form_header_field,
(void *) &h, r->headers_out,
"Connection",
"Keep-Alive",
"ETag",
"Content-Location",
"Expires",
"Cache-Control",
"Vary",
"Warning",
"WWW-Authenticate",
"Proxy-Authenticate",
"Set-Cookie",
"Set-Cookie2",
NULL);
}
else {
send_all_header_fields(&h, r);
}
terminate_header(b2);
rv = ap_pass_brigade(f->next, b2);
if (rv != APR_SUCCESS) {
goto out;
}
ctx->headers_sent = 1;
if (r->header_only || r->status == HTTP_NO_CONTENT) {
apr_brigade_cleanup(b);
goto out;
}
r->sent_bodyct = 1; /* Whatever follows is real body stuff... */
if (r->chunked) {
/* We can't add this filter until we have already sent the headers.
* If we add it before this point, then the headers will be chunked
* as well, and that is just wrong.
*/
ap_add_output_filter("CHUNK", NULL, r, r->connection);
}
/* Don't remove this filter until after we have added the CHUNK filter.
* Otherwise, f->next won't be the CHUNK filter and thus the first
* brigade won't be chunked properly.
*/
ap_remove_output_filter(f);
rv = ap_pass_brigade(f->next, b);
out:
if (recursive_error) {
return AP_FILTER_ERROR;
}
return rv;
}
/*
* Map specific APR codes returned by the filter stack to HTTP error
* codes, or the default status code provided. Use it as follows:
*
* return ap_map_http_request_error(rv, HTTP_BAD_REQUEST);
*
* If the filter has already handled the error, AP_FILTER_ERROR will
* be returned, which is cleanly passed through.
*
* These mappings imply that the filter stack is reading from the
* downstream client, the proxy will map these codes differently.
*/
AP_DECLARE(int) ap_map_http_request_error(apr_status_t rv, int status)
{
switch (rv) {
case AP_FILTER_ERROR:
return AP_FILTER_ERROR;
case APR_ENOSPC:
return HTTP_REQUEST_ENTITY_TOO_LARGE;
case APR_ENOTIMPL:
return HTTP_NOT_IMPLEMENTED;
case APR_TIMEUP:
case APR_ETIMEDOUT:
return HTTP_REQUEST_TIME_OUT;
default:
return status;
}
}
/* In HTTP/1.1, any method can have a body. However, most GET handlers
* wouldn't know what to do with a request body if they received one.
* This helper routine tests for and reads any message body in the request,
* simply discarding whatever it receives. We need to do this because
* failing to read the request body would cause it to be interpreted
* as the next request on a persistent connection.
*
* Since we return an error status if the request is malformed, this
* routine should be called at the beginning of a no-body handler, e.g.,
*
* if ((retval = ap_discard_request_body(r)) != OK) {
* return retval;
* }
*/
AP_DECLARE(int) ap_discard_request_body(request_rec *r)
{
apr_bucket_brigade *bb;
int seen_eos;
apr_status_t rv;
/* Sometimes we'll get in a state where the input handling has
* detected an error where we want to drop the connection, so if
* that's the case, don't read the data as that is what we're trying
* to avoid.
*
* This function is also a no-op on a subrequest.
*/
if (r->main || r->connection->keepalive == AP_CONN_CLOSE ||
ap_status_drops_connection(r->status)) {
return OK;
}
bb = apr_brigade_create(r->pool, r->connection->bucket_alloc);
seen_eos = 0;
do {
apr_bucket *bucket;
rv = ap_get_brigade(r->input_filters, bb, AP_MODE_READBYTES,
APR_BLOCK_READ, HUGE_STRING_LEN);
if (rv != APR_SUCCESS) {
apr_brigade_destroy(bb);
return ap_map_http_request_error(rv, HTTP_BAD_REQUEST);
}
for (bucket = APR_BRIGADE_FIRST(bb);
bucket != APR_BRIGADE_SENTINEL(bb);
bucket = APR_BUCKET_NEXT(bucket))
{
const char *data;
apr_size_t len;
if (APR_BUCKET_IS_EOS(bucket)) {
seen_eos = 1;
break;
}
/* These are metadata buckets. */
if (bucket->length == 0) {
continue;
}
/* We MUST read because in case we have an unknown-length
* bucket or one that morphs, we want to exhaust it.
*/
rv = apr_bucket_read(bucket, &data, &len, APR_BLOCK_READ);
if (rv != APR_SUCCESS) {
apr_brigade_destroy(bb);
return HTTP_BAD_REQUEST;
}
}
apr_brigade_cleanup(bb);
} while (!seen_eos);
return OK;
}
/* Here we deal with getting the request message body from the client.
* Whether or not the request contains a body is signaled by the presence
* of a non-zero Content-Length or by a Transfer-Encoding: chunked.
*
* Note that this is more complicated than it was in Apache 1.1 and prior
* versions, because chunked support means that the module does less.
*
* The proper procedure is this:
*
* 1. Call ap_setup_client_block() near the beginning of the request
* handler. This will set up all the necessary properties, and will
* return either OK, or an error code. If the latter, the module should
* return that error code. The second parameter selects the policy to
* apply if the request message indicates a body, and how a chunked
* transfer-coding should be interpreted. Choose one of
*
* REQUEST_NO_BODY Send 413 error if message has any body
* REQUEST_CHUNKED_ERROR Send 411 error if body without Content-Length
* REQUEST_CHUNKED_DECHUNK If chunked, remove the chunks for me.
* REQUEST_CHUNKED_PASS If chunked, pass the chunk headers with body.
*
* In order to use the last two options, the caller MUST provide a buffer
* large enough to hold a chunk-size line, including any extensions.
*
* 2. When you are ready to read a body (if any), call ap_should_client_block().
* This will tell the module whether or not to read input. If it is 0,
* the module should assume that there is no message body to read.
*
* 3. Finally, call ap_get_client_block in a loop. Pass it a buffer and its size.
* It will put data into the buffer (not necessarily a full buffer), and
* return the length of the input block. When it is done reading, it will
* return 0 if EOF, or -1 if there was an error.
* If an error occurs on input, we force an end to keepalive.
*
* This step also sends a 100 Continue response to HTTP/1.1 clients if appropriate.
*/
AP_DECLARE(int) ap_setup_client_block(request_rec *r, int read_policy)
{
const char *tenc = apr_table_get(r->headers_in, "Transfer-Encoding");
const char *lenp = apr_table_get(r->headers_in, "Content-Length");
r->read_body = read_policy;
r->read_chunked = 0;
r->remaining = 0;
if (tenc) {
if (strcasecmp(tenc, "chunked")) {
ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(01592)
"Unknown Transfer-Encoding %s", tenc);
return HTTP_NOT_IMPLEMENTED;
}
if (r->read_body == REQUEST_CHUNKED_ERROR) {
ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(01593)
"chunked Transfer-Encoding forbidden: %s", r->uri);
return (lenp) ? HTTP_BAD_REQUEST : HTTP_LENGTH_REQUIRED;
}
r->read_chunked = 1;
}
else if (lenp) {
char *endstr;
if (apr_strtoff(&r->remaining, lenp, &endstr, 10)
|| *endstr || r->remaining < 0) {
r->remaining = 0;
ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(01594)
"Invalid Content-Length");
return HTTP_BAD_REQUEST;
}
}
if ((r->read_body == REQUEST_NO_BODY)
&& (r->read_chunked || (r->remaining > 0))) {
ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(01595)
"%s with body is not allowed for %s", r->method, r->uri);
return HTTP_REQUEST_ENTITY_TOO_LARGE;
}
#ifdef AP_DEBUG
{
/* Make sure ap_getline() didn't leave any droppings. */
core_request_config *req_cfg =
(core_request_config *)ap_get_core_module_config(r->request_config);
AP_DEBUG_ASSERT(APR_BRIGADE_EMPTY(req_cfg->bb));
}
#endif
return OK;
}
AP_DECLARE(int) ap_should_client_block(request_rec *r)
{
/* First check if we have already read the request body */
if (r->read_length || (!r->read_chunked && (r->remaining <= 0))) {
return 0;
}
return 1;
}
/* get_client_block is called in a loop to get the request message body.
* This is quite simple if the client includes a content-length
* (the normal case), but gets messy if the body is chunked. Note that
* r->remaining is used to maintain state across calls and that
* r->read_length is the total number of bytes given to the caller
* across all invocations. It is messy because we have to be careful not
* to read past the data provided by the client, since these reads block.
* Returns 0 on End-of-body, -1 on error or premature chunk end.
*
*/
AP_DECLARE(long) ap_get_client_block(request_rec *r, char *buffer,
apr_size_t bufsiz)
{
apr_status_t rv;
apr_bucket_brigade *bb;
if (r->remaining < 0 || (!r->read_chunked && r->remaining == 0)) {
return 0;
}
bb = apr_brigade_create(r->pool, r->connection->bucket_alloc);
if (bb == NULL) {
r->connection->keepalive = AP_CONN_CLOSE;
return -1;
}
rv = ap_get_brigade(r->input_filters, bb, AP_MODE_READBYTES,
APR_BLOCK_READ, bufsiz);
/* We lose the failure code here. This is why ap_get_client_block should
* not be used.
*/
if (rv == AP_FILTER_ERROR) {
/* AP_FILTER_ERROR means a filter has responded already,
* we are DONE.
*/
apr_brigade_destroy(bb);
return -1;
}
if (rv != APR_SUCCESS) {
/* if we actually fail here, we want to just return and
* stop trying to read data from the client.
*/
r->connection->keepalive = AP_CONN_CLOSE;
apr_brigade_destroy(bb);
return -1;
}
/* If this fails, it means that a filter is written incorrectly and that
* it needs to learn how to properly handle APR_BLOCK_READ requests by
* returning data when requested.
*/
AP_DEBUG_ASSERT(!APR_BRIGADE_EMPTY(bb));
/* Check to see if EOS in the brigade.
*
* If so, we have to leave a nugget for the *next* ap_get_client_block
* call to return 0.
*/
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(bb))) {
if (r->read_chunked) {
r->remaining = -1;
}
else {
r->remaining = 0;
}
}
rv = apr_brigade_flatten(bb, buffer, &bufsiz);
if (rv != APR_SUCCESS) {
apr_brigade_destroy(bb);
return -1;
}
/* XXX yank me? */
r->read_length += bufsiz;
apr_brigade_destroy(bb);
return bufsiz;
}
/* Context struct for ap_http_outerror_filter */
typedef struct {
int seen_eoc;
} outerror_filter_ctx_t;
/* Filter to handle any error buckets on output */
apr_status_t ap_http_outerror_filter(ap_filter_t *f,
apr_bucket_brigade *b)
{
request_rec *r = f->r;
outerror_filter_ctx_t *ctx = (outerror_filter_ctx_t *)(f->ctx);
apr_bucket *e;
/* Create context if none is present */
if (!ctx) {
ctx = apr_pcalloc(r->pool, sizeof(outerror_filter_ctx_t));
f->ctx = ctx;
}
for (e = APR_BRIGADE_FIRST(b);
e != APR_BRIGADE_SENTINEL(b);
e = APR_BUCKET_NEXT(e))
{
if (AP_BUCKET_IS_ERROR(e)) {
/*
* Start of error handling state tree. Just one condition
* right now :)
*/
if (((ap_bucket_error *)(e->data))->status == HTTP_BAD_GATEWAY) {
/* stream aborted and we have not ended it yet */
r->connection->keepalive = AP_CONN_CLOSE;
}
continue;
}
/* Detect EOC buckets and memorize this in the context. */
if (AP_BUCKET_IS_EOC(e)) {
ctx->seen_eoc = 1;
}
}
/*
* Remove all data buckets that are in a brigade after an EOC bucket
* was seen, as an EOC bucket tells us that no (further) resource
* and protocol data should go out to the client. OTOH meta buckets
* are still welcome as they might trigger needed actions down in
* the chain (e.g. in network filters like SSL).
* Remark 1: It is needed to dump ALL data buckets in the brigade
* since an filter in between might have inserted data
* buckets BEFORE the EOC bucket sent by the original
* sender and we do NOT want this data to be sent.
* Remark 2: Dumping all data buckets here does not necessarily mean
* that no further data is send to the client as:
* 1. Network filters like SSL can still be triggered via
* meta buckets to talk with the client e.g. for a
* clean shutdown.
* 2. There could be still data that was buffered before
* down in the chain that gets flushed by a FLUSH or an
* EOS bucket.
*/
if (ctx->seen_eoc) {
for (e = APR_BRIGADE_FIRST(b);
e != APR_BRIGADE_SENTINEL(b);
e = APR_BUCKET_NEXT(e))
{
if (!APR_BUCKET_IS_METADATA(e)) {
APR_BUCKET_REMOVE(e);
}
}
}
return ap_pass_brigade(f->next, b);
}