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
|
/*
* ProFTPD - mod_proxy reverse datastore implementation
* Copyright (c) 2012-2025 TJ Saunders
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
*
* As a special exemption, TJ Saunders and other respective copyright holders
* give permission to link this program with OpenSSL, and distribute the
* resulting executable, without including the source code for OpenSSL in the
* source distribution.
*/
#include "mod_proxy.h"
#include "proxy/db.h"
#include "proxy/conn.h"
#include "proxy/reverse.h"
#include "proxy/reverse/db.h"
#include "proxy/random.h"
#include "proxy/tls.h"
#include "proxy/ftp/ctrl.h"
#include <sqlite3.h>
extern xaset_t *server_list;
#define PROXY_REVERSE_DB_SCHEMA_NAME "proxy_reverse"
#define PROXY_REVERSE_DB_SCHEMA_VERSION 6
/* PerHost/PerUser/PerGroup table limits */
#define PROXY_REVERSE_DB_PERHOST_MAX_ENTRIES 8192
#define PROXY_REVERSE_DB_PERUSER_MAX_ENTRIES 8192
#define PROXY_REVERSE_DB_PERGROUP_MAX_ENTRIES 8192
static array_header *db_backends = NULL;
static const char *trace_channel = "proxy.reverse.db";
static unsigned int str2hash(const void *key, size_t keysz) {
unsigned int i = 0;
size_t sz = !keysz ? strlen((const char *) key) : keysz;
while (sz--) {
const char *k = key;
unsigned int c;
pr_signals_handle();
c = k[sz];
i = (i * 33) + c;
}
return i;
}
static int reverse_db_add_schema(pool *p, struct proxy_dbh *dbh,
const char *db_path) {
int res;
const char *stmt, *errstr = NULL;
/* CREATE TABLE proxy_vhosts (
* vhost_id INTEGER NOT NULL PRIMARY KEY,
* vhost_name TEXT NOT NULL
* );
*/
stmt = "CREATE TABLE IF NOT EXISTS proxy_vhosts (vhost_id INTEGER NOT NULL PRIMARY KEY, vhost_name TEXT NOT NULL);";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
/* TODO: Add these columns:
* unhealthy BOOLEAN,
* unhealthy_ms BIGINT,
* unhealthy_reason TEXT
*/
/* CREATE TABLE proxy_vhost_backends (
* vhost_id INTEGER NOT NULL,
* backend_id INTEGER NOT NULL,
* backend_uri TEXT NOT NULL,
* conn_count INTEGER NOT NULL,
* connect_ms INTEGER
* );
*
* Note: while it might be tempting to have a FOREIGN KEY constraint on
* vhost_id to the proxy_vhosts.vhost_id column, doing so also means that
* vhost_id MUST be unique. And there will be vhosts that have MULTIPLE
* backend URIs, which would violate that uniqueness constraint. Thus we
* create our own separate index on the vhost_id column.
*/
stmt = "CREATE TABLE IF NOT EXISTS proxy_vhost_backends (vhost_id INTEGER NOT NULL, backend_id INTEGER NOT NULL, backend_uri TEXT NOT NULL, conn_count INTEGER NOT NULL, connect_ms INTEGER);";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
/* CREATE INDEX proxy_vhost_backends_vhost_id_idx */
stmt = "CREATE INDEX IF NOT EXISTS proxy_vhost_backends_vhost_id_idx ON proxy_vhost_backends (vhost_id);";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
/* CREATE TABLE proxy_vhost_reverse_roundrobin (
* vhost_id INTEGER NOT NULL,
* current_backend_id INTEGER NOT NULL,
* FOREIGN KEY (vhost_id) REFERENCES proxy_vhosts (vhost_id),
* FOREIGN KEY (current_backend_id) REFERENCES proxy_vhost_backends (backend_id)
* );
*/
stmt = "CREATE TABLE IF NOT EXISTS proxy_vhost_reverse_roundrobin (vhost_id INTEGER NOT NULL, current_backend_id INTEGER NOT NULL, FOREIGN KEY (vhost_id) REFERENCES proxy_vhosts (vhost_id), FOREIGN KEY (current_backend_id) REFERENCES proxy_vhost_backends (backend_id));";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
/* CREATE TABLE proxy_vhost_reverse_shuffle (
* vhost_id INTEGER NOT NULL,
* avail_backend_id INTEGER NOT NULL,
* FOREIGN KEY (vhost_id) REFERENCES proxy_vhosts (vhost_id),
* FOREIGN KEY (avail_backend_id) REFERENCES proxy_vhost_backends (backend_id)
* );
*/
stmt = "CREATE TABLE IF NOT EXISTS proxy_vhost_reverse_shuffle (vhost_id INTEGER NOT NULL, avail_backend_id INTEGER NOT NULL, FOREIGN KEY (vhost_id) REFERENCES proxy_vhosts (vhost_id), FOREIGN KEY (avail_backend_id) REFERENCES proxy_vhost_backends (backend_id));";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
/* CREATE TABLE proxy_vhost_reverse_per_user (
* vhost_id INTEGER NOT NULL,
* user_name TEXT NOT NULL,
* backend_uri TEXT,
* FOREIGN KEY (vhost_id) REFERENCES proxy_vhosts (vhost_id),
* UNIQUE (vhost_id, user_name)
* );
*/
stmt = "CREATE TABLE IF NOT EXISTS proxy_vhost_reverse_per_user (vhost_id INTEGER NOT NULL, user_name TEXT NOT NULL, backend_uri TEXT, FOREIGN KEY (vhost_id) REFERENCES proxy_vhosts (vhost_id), UNIQUE (vhost_id, user_name));";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
/* CREATE INDEX proxy_vhost_reverse_per_user_name_idx */
stmt = "CREATE INDEX IF NOT EXISTS proxy_vhost_reverse_per_user_name_idx ON proxy_vhost_reverse_per_user (user_name);";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
/* CREATE TABLE proxy_vhost_reverse_per_group (
* vhost_id INTEGER NOT NULL,
* group_name TEXT NOT NULL,
* backend_uri TEXT,
* FOREIGN KEY (vhost_id) REFERENCES proxy_vhosts (vhost_id),
* UNIQUE (vhost_id, group_name)
* );
*/
stmt = "CREATE TABLE IF NOT EXISTS proxy_vhost_reverse_per_group (vhost_id INTEGER NOT NULL, group_name TEXT NOT NULL, backend_uri TEXT, FOREIGN KEY (vhost_id) REFERENCES proxy_vhosts (vhost_id), UNIQUE (vhost_id, group_name));";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
/* CREATE INDEX proxy_vhost_reverse_per_group_name_idx */
stmt = "CREATE INDEX IF NOT EXISTS proxy_vhost_reverse_per_group_name_idx ON proxy_vhost_reverse_per_group (group_name);";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
/* CREATE TABLE proxy_vhost_reverse_per_host (
* vhost_id INTEGER NOT NULL,
* ip_addr TEXT NOT NULL,
* backend_uri TEXT,
* FOREIGN KEY (vhost_id) REFERENCES proxy_vhosts (vhost_id),
* UNIQUE (vhost_id, ip_addr)
* );
*/
stmt = "CREATE TABLE IF NOT EXISTS proxy_vhost_reverse_per_host (vhost_id INTEGER NOT NULL, ip_addr TEXT NOT NULL, backend_uri TEXT, FOREIGN KEY (vhost_id) REFERENCES proxy_vhosts (vhost_id), UNIQUE (vhost_id, ip_addr));";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
/* CREATE INDEX proxy_vhost_reverse_per_host_ipaddr_idx */
stmt = "CREATE INDEX IF NOT EXISTS proxy_vhost_reverse_per_host_ipaddr_idx ON proxy_vhost_reverse_per_host (ip_addr);";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
return 0;
}
static int reverse_db_truncate_tables(pool *p, struct proxy_dbh *dbh) {
int res;
const char *index_name, *stmt, *errstr = NULL;
stmt = "DELETE FROM proxy_vhosts;";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
stmt = "DELETE FROM proxy_vhost_backends;";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
stmt = "DELETE FROM proxy_vhost_reverse_roundrobin;";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
stmt = "DELETE FROM proxy_vhost_reverse_shuffle;";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
stmt = "DELETE FROM proxy_vhost_reverse_per_user;";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
stmt = "DELETE FROM proxy_vhost_reverse_per_group;";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
stmt = "DELETE FROM proxy_vhost_reverse_per_host;";
res = proxy_db_exec_stmt(p, dbh, stmt, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr);
errno = EPERM;
return -1;
}
/* Note: don't forget to rebuild the indices, too! */
index_name = "proxy_vhost_backends_vhost_id_idx";
res = proxy_db_reindex(p, dbh, index_name, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error reindexing '%s': %s", index_name, errstr);
errno = EPERM;
return -1;
}
index_name = "proxy_vhost_reverse_per_user_name_idx";
res = proxy_db_reindex(p, dbh, index_name, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error reindexing '%s': %s", index_name, errstr);
errno = EPERM;
return -1;
}
index_name = "proxy_vhost_reverse_per_group_name_idx";
res = proxy_db_reindex(p, dbh, index_name, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error reindexing '%s': %s", index_name, errstr);
errno = EPERM;
return -1;
}
index_name = "proxy_vhost_reverse_per_host_ipaddr_idx";
res = proxy_db_reindex(p, dbh, index_name, &errstr);
if (res < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error reindexing '%s': %s", index_name, errstr);
errno = EPERM;
return -1;
}
return 0;
}
static int reverse_db_add_vhost(pool *p, struct proxy_dbh *dbh, server_rec *s) {
int res, xerrno = 0;
const char *stmt, *errstr = NULL;
array_header *results;
stmt = "INSERT INTO proxy_vhosts (vhost_id, vhost_name) VALUES (?, ?);";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
xerrno = errno;
(void) pr_log_debug(DEBUG3, MOD_PROXY_VERSION
": error preparing statement '%s': %s", stmt, strerror(xerrno));
errno = xerrno;
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &(s->sid), 0);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 2, PROXY_DB_BIND_TYPE_TEXT,
(void *) s->ServerName, -1);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
return 0;
}
static int reverse_db_add_backend(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, const char *backend_uri, int backend_id) {
int res;
const char *stmt, *errstr = NULL;
array_header *results;
stmt = "INSERT INTO proxy_vhost_backends (vhost_id, backend_uri, backend_id, conn_count) VALUES (?, ?, ?, 0);";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 2, PROXY_DB_BIND_TYPE_TEXT,
(void *) backend_uri, -1);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 3, PROXY_DB_BIND_TYPE_INT,
(void *) &backend_id, 0);
if (res < 0) {
return -1;
}
pr_trace_msg(trace_channel, 13,
"adding backend '%.100s' to database table at index %d", backend_uri,
backend_id);
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
return 0;
}
static int reverse_db_add_backends(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, array_header *backends) {
register unsigned int i;
for (i = 0; i < backends->nelts; i++) {
int res;
struct proxy_conn *pconn;
const char *backend_uri;
pconn = ((struct proxy_conn **) backends->elts)[i];
backend_uri = proxy_conn_get_uri(pconn);
res = reverse_db_add_backend(p, dbh, vhost_id, backend_uri, i);
if (res < 0) {
int xerrno = errno;
pr_trace_msg(trace_channel, 6,
"error adding database entry for backend '%.100s': %s", backend_uri,
strerror(xerrno));
errno = xerrno;
return -1;
}
pr_trace_msg(trace_channel, 18,
"added database entry for backend '%.100s' (ID %u)", backend_uri, i);
}
return 0;
}
/* ProxyReverseConnectPolicy: Shuffle */
static int reverse_db_add_shuffle(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, int backend_id) {
int res;
const char *stmt, *errstr = NULL;
array_header *results;
stmt = "INSERT INTO proxy_vhost_reverse_shuffle (vhost_id, avail_backend_id) VALUES (?, ?);";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 2, PROXY_DB_BIND_TYPE_INT,
(void *) &backend_id, 0);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
return 0;
}
static int reverse_db_shuffle_init(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, array_header *backends) {
register unsigned int i;
for (i = 0; i < backends->nelts; i++) {
int res;
res = reverse_db_add_shuffle(p, dbh, vhost_id, i);
if (res < 0) {
int xerrno = errno;
pr_trace_msg(trace_channel, 6,
"error adding shuffle database entry for ID %d: %s", i,
strerror(xerrno));
errno = xerrno;
return -1;
}
}
return 0;
}
static int reverse_db_shuffle_next(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id) {
int backend_id = -1, res;
const char *stmt, *errstr = NULL;
array_header *results;
unsigned int nrows = 0;
stmt = "SELECT COUNT(*) FROM proxy_vhost_reverse_shuffle WHERE vhost_id = ?;";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
if (results->nelts != 1) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"expected 1 result from statement '%s', got %d", stmt,
results->nelts);
errno = EINVAL;
return -1;
}
nrows = atoi(((char **) results->elts)[0]);
if (nrows == 0) {
res = reverse_db_shuffle_init(p, dbh, vhost_id, db_backends);
if (res < 0) {
return -1;
}
nrows = db_backends->nelts;
}
backend_id = (int) proxy_random_next(0, nrows-1);
return backend_id;
}
static int reverse_db_shuffle_used(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, int backend_id) {
int res, xerrno = 0;
const char *stmt, *errstr = NULL;
array_header *results;
stmt = "DELETE FROM proxy_vhost_reverse_shuffle WHERE vhost_id = ? AND avail_backend_id = ?;";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
xerrno = errno;
(void) pr_log_debug(DEBUG3, MOD_PROXY_VERSION
": error preparing statement '%s': %s", stmt, strerror(xerrno));
errno = xerrno;
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 2, PROXY_DB_BIND_TYPE_INT,
(void *) &backend_id, 0);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
return 0;
}
/* ProxyReverseConnectPolicy: RoundRobin */
static int reverse_db_roundrobin_update(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, int backend_id) {
int res;
const char *stmt, *errstr = NULL;
array_header *results;
stmt = "UPDATE proxy_vhost_reverse_roundrobin SET current_backend_id = ? WHERE vhost_id = ?;";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &backend_id, 0);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 2, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
return 0;
}
static int reverse_db_roundrobin_init(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, int backend_id) {
int res;
const char *stmt, *errstr = NULL;
array_header *results;
stmt = "INSERT INTO proxy_vhost_reverse_roundrobin (vhost_id, current_backend_id) VALUES (?, ?);";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 2, PROXY_DB_BIND_TYPE_INT,
(void *) &backend_id, 0);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
return 0;
}
static int reverse_db_roundrobin_next(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id) {
int backend_id = 0, res;
const char *stmt, *errstr = NULL;
array_header *results;
stmt = "SELECT current_backend_id FROM proxy_vhost_reverse_roundrobin WHERE vhost_id = ?;";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
if (results->nelts != 1) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"expected 1 result from statement '%s', got %d", stmt,
results->nelts);
errno = EINVAL;
return -1;
}
backend_id = atoi(((char **) results->elts)[0]);
/* If the current backend ID is the last one, wrap around to index 0. */
if (backend_id == ((int) db_backends->nelts-1)) {
backend_id = 0;
} else {
backend_id++;
}
return backend_id;
}
static int reverse_db_roundrobin_used(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, int backend_id) {
return reverse_db_roundrobin_update(p, dbh, vhost_id, backend_id);
}
/* ProxyReverseConnectPolicy: LeastConns */
static int reverse_db_leastconns_next(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id) {
int backend_id = 0, res;
const char *stmt, *errstr = NULL;
array_header *results;
stmt = "SELECT backend_id FROM proxy_vhost_backends WHERE vhost_id = ? ORDER BY conn_count ASC LIMIT 1;";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
if (results->nelts == 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"expected results from statement '%s', got %d", stmt,
results->nelts);
errno = EINVAL;
return -1;
}
/* Just pick the first index/backend returned. */
backend_id = atoi(((char **) results->elts)[0]);
return backend_id;
}
static int reverse_db_leastconns_used(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, int backend_id) {
/* TODO: anything to do here? */
return 0;
}
/* ProxyReverseConnectPolicy: LeastResponseTime */
/* Note: "least response time" is determined by calculating the following
* for each backend server:
*
* N = connection count * connect time (ms)
*
* and choosing the backend with the lowest value for N. If there are no
* backend servers with connect time values, choose the one with the lowest
* connection count.
*/
static int reverse_db_leastresponsetime_next(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id) {
int backend_id = 0, res;
const char *stmt, *errstr = NULL;
array_header *results;
stmt = "SELECT backend_id FROM proxy_vhost_backends WHERE vhost_id = ? ORDER BY (conn_count * connect_ms) ASC LIMIT 1;";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
if (results->nelts == 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"expected results from statement '%s', got %d", stmt,
results->nelts);
errno = EINVAL;
return -1;
}
/* Just pick the first index/backend returned. */
backend_id = atoi(((char **) results->elts)[0]);
return backend_id;
}
static int reverse_db_leastresponsetime_used(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, int backend_id) {
/* TODO: anything to do here? */
return 0;
}
/* ProxyReverseConnectPolicy: PerUser */
static array_header *reverse_db_peruser_get(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, const char *user) {
int res;
const char *stmt, *errstr = NULL;
array_header *results;
stmt = "SELECT backend_uri FROM proxy_vhost_reverse_per_user WHERE vhost_id = ? AND user_name = ?;";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return NULL;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return NULL;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 2, PROXY_DB_BIND_TYPE_TEXT,
(void *) user, -1);
if (res < 0) {
return NULL;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return NULL;
}
return results;
}
static const struct proxy_conn *reverse_db_peruser_init(pool *p,
struct proxy_dbh *dbh, unsigned int vhost_id, const char *user) {
const struct proxy_conn *pconn = NULL;
struct proxy_conn **conns = NULL;
int backend_count = 0, res;
const char *stmt, *uri, *errstr = NULL;
array_header *backends, *results;
backends = proxy_reverse_pername_backends(p, user, TRUE);
if (backends == NULL) {
return NULL;
}
backend_count = backends->nelts;
conns = backends->elts;
if (backend_count == 1) {
pconn = conns[0];
} else {
size_t user_len;
unsigned int h;
int idx;
user_len = strlen(user);
h = str2hash(user, user_len);
idx = h % backend_count;
pconn = conns[idx];
}
/* TODO: What happens if the chosen backend URI cannot be used, e.g.
* because it is down/unreachable? In reverse_try_connect(), we'll know
* that it failed to connect, but how to tunnel that back down here, to
* choose another?
*/
stmt = "INSERT OR IGNORE INTO proxy_vhost_reverse_per_user (vhost_id, user_name, backend_uri) VALUES (?, ?, ?);";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return NULL;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return NULL;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 2, PROXY_DB_BIND_TYPE_TEXT,
(void *) user, -1);
if (res < 0) {
return NULL;
}
uri = proxy_conn_get_uri(pconn);
res = proxy_db_bind_stmt(p, dbh, stmt, 3, PROXY_DB_BIND_TYPE_TEXT,
(void *) uri, -1);
if (res < 0) {
return NULL;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return NULL;
}
return pconn;
}
static const struct proxy_conn *reverse_db_peruser_next(pool *p,
struct proxy_dbh *dbh, unsigned int vhost_id, const char *user) {
array_header *results;
const struct proxy_conn *pconn = NULL;
pconn = reverse_db_peruser_init(p, dbh, vhost_id, user);
if (pconn == NULL &&
errno != ENOENT) {
results = reverse_db_peruser_get(p, dbh, vhost_id, user);
if (results != NULL &&
results->nelts > 0) {
char **vals;
vals = results->elts;
pconn = proxy_conn_create(p, vals[0], 0);
}
}
if (pconn != NULL) {
return pconn;
}
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error preparing database for ProxyReverseConnectPolicy PerUser for "
"user '%s': %s", user, strerror(ENOENT));
errno = EPERM;
return NULL;
}
static int reverse_db_peruser_used(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, int backend_id) {
int count, res;
const char *stmt, *errstr = NULL;
array_header *results;
/* To prevent database bloating too much, delete all of the entries
* in the table if we're over our limit.
*/
stmt = "SELECT COUNT(*) FROM proxy_vhost_reverse_per_user;";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
if (results->nelts != 1) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"expected 1 result from statement '%s', got %d", stmt,
results->nelts);
errno = EINVAL;
return -1;
}
count = atoi(((char **) results->elts)[0]);
if (count <= PROXY_REVERSE_DB_PERUSER_MAX_ENTRIES) {
return 0;
}
pr_trace_msg(trace_channel, 5,
"PerUser entry count (%d) exceeds max (%d), purging", count,
PROXY_REVERSE_DB_PERUSER_MAX_ENTRIES);
stmt = "DELETE FROM proxy_vhost_reverse_per_user;";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
return 0;
}
/* ProxyReverseConnectPolicy: PerGroup */
static array_header *reverse_db_pergroup_get(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, const char *group) {
int res;
const char *stmt, *errstr = NULL;
array_header *results;
stmt = "SELECT backend_uri FROM proxy_vhost_reverse_per_group WHERE vhost_id = ? AND group_name = ?;";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return NULL;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return NULL;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 2, PROXY_DB_BIND_TYPE_TEXT,
(void *) group, -1);
if (res < 0) {
return NULL;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return NULL;
}
return results;
}
static const struct proxy_conn *reverse_db_pergroup_init(pool *p,
struct proxy_dbh *dbh, unsigned int vhost_id, const char *group) {
const struct proxy_conn *pconn = NULL;
struct proxy_conn **conns = NULL;
int backend_count = 0, res;
const char *stmt, *uri, *errstr = NULL;
array_header *backends, *results;
backends = proxy_reverse_pername_backends(p, group, FALSE);
if (backends == NULL) {
return NULL;
}
backend_count = backends->nelts;
conns = backends->elts;
if (backend_count == 1) {
pconn = conns[0];
} else {
size_t group_len;
unsigned int h;
int idx;
group_len = strlen(group);
h = str2hash(group, group_len);
idx = h % backend_count;
pconn = conns[idx];
}
/* TODO: What happens if the chosen backend URI cannot be used, e.g.
* because it is down/unreachable? In reverse_try_connect(), we'll know
* that it failed to connect, but how to tunnel that back down here, to
* choose another?
*/
stmt = "INSERT OR IGNORE INTO proxy_vhost_reverse_per_group (vhost_id, group_name, backend_uri) VALUES (?, ?, ?);";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return NULL;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return NULL;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 2, PROXY_DB_BIND_TYPE_TEXT,
(void *) group, -1);
if (res < 0) {
return NULL;
}
uri = proxy_conn_get_uri(pconn);
res = proxy_db_bind_stmt(p, dbh, stmt, 3, PROXY_DB_BIND_TYPE_TEXT,
(void *) uri, -1);
if (res < 0) {
return NULL;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return NULL;
}
return pconn;
}
static const struct proxy_conn *reverse_db_pergroup_next(pool *p,
struct proxy_dbh *dbh, unsigned int vhost_id, const char *group) {
array_header *results;
const struct proxy_conn *pconn = NULL;
pconn = reverse_db_pergroup_init(p, dbh, vhost_id, group);
if (pconn == NULL &&
errno != ENOENT) {
results = reverse_db_pergroup_get(p, dbh, vhost_id, group);
if (results != NULL &&
results->nelts > 0) {
char **vals;
vals = results->elts;
pconn = proxy_conn_create(p, vals[0], 0);
}
}
if (pconn != NULL) {
return pconn;
}
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error preparing database for ProxyReverseConnectPolicy PerGroup for "
"group '%s': %s", group, strerror(ENOENT));
errno = EPERM;
return NULL;
}
static int reverse_db_pergroup_used(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, int backend_id) {
int count, res;
const char *stmt, *errstr = NULL;
array_header *results;
/* To prevent database bloating too much, delete all of the entries
* in the table if we're over our limit.
*/
stmt = "SELECT COUNT(*) FROM proxy_vhost_reverse_per_group;";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
if (results->nelts != 1) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"expected 1 result from statement '%s', got %d", stmt,
results->nelts);
errno = EINVAL;
return -1;
}
count = atoi(((char **) results->elts)[0]);
if (count <= PROXY_REVERSE_DB_PERGROUP_MAX_ENTRIES) {
return 0;
}
pr_trace_msg(trace_channel, 5,
"PerGroup entry count (%d) exceeds max (%d), purging", count,
PROXY_REVERSE_DB_PERGROUP_MAX_ENTRIES);
stmt = "DELETE FROM proxy_vhost_reverse_per_group;";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
return 0;
}
/* ProxyReverseConnectPolicy: PerHost */
static array_header *reverse_db_perhost_get(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, const pr_netaddr_t *addr) {
int res;
const char *stmt, *errstr = NULL, *ip;
array_header *results;
stmt = "SELECT backend_uri FROM proxy_vhost_reverse_per_host WHERE vhost_id = ? AND ip_addr = ?;";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return NULL;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return NULL;
}
ip = pr_netaddr_get_ipstr(addr);
res = proxy_db_bind_stmt(p, dbh, stmt, 2, PROXY_DB_BIND_TYPE_TEXT,
(void *) ip, -1);
if (res < 0) {
return NULL;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return NULL;
}
return results;
}
static const struct proxy_conn *reverse_db_perhost_init(pool *p,
struct proxy_dbh *dbh, unsigned int vhost_id, array_header *backends,
const pr_netaddr_t *addr) {
const struct proxy_conn *pconn = NULL;
struct proxy_conn **conns;
int res;
const char *ip, *stmt, *uri, *errstr = NULL;
array_header *results;
ip = pr_netaddr_get_ipstr(addr);
conns = backends->elts;
if (backends->nelts == 1) {
pconn = conns[0];
} else {
size_t iplen;
unsigned int h;
int idx;
iplen = strlen(ip);
h = str2hash(ip, iplen);
idx = h % backends->nelts;
pconn = conns[idx];
}
stmt = "INSERT OR IGNORE INTO proxy_vhost_reverse_per_host (vhost_id, ip_addr, backend_uri) VALUES (?, ?, ?);";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return NULL;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 1, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return NULL;
}
res = proxy_db_bind_stmt(p, dbh, stmt, 2, PROXY_DB_BIND_TYPE_TEXT,
(void *) ip, -1);
if (res < 0) {
return NULL;
}
uri = proxy_conn_get_uri(pconn);
res = proxy_db_bind_stmt(p, dbh, stmt, 3, PROXY_DB_BIND_TYPE_TEXT,
(void *) uri, -1);
if (res < 0) {
return NULL;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return NULL;
}
return pconn;
}
static const struct proxy_conn *reverse_db_perhost_next(pool *p,
struct proxy_dbh *dbh, unsigned int vhost_id, const pr_netaddr_t *addr) {
array_header *results;
const struct proxy_conn *pconn = NULL;
results = reverse_db_perhost_get(p, dbh, vhost_id, addr);
if (results == NULL) {
return NULL;
}
if (results->nelts == 0) {
/* This can happen the very first time; perform an on-demand discovery
* of the backends for this host, and try again.
*/
pconn = reverse_db_perhost_init(p, dbh, vhost_id, db_backends, addr);
if (pconn == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error preparing database for ProxyReverseConnectPolicy "
"PerHost for host '%s': %s", pr_netaddr_get_ipstr(addr),
strerror(errno));
errno = EPERM;
return NULL;
}
} else {
char **vals;
vals = results->elts;
pconn = proxy_conn_create(p, vals[0], 0);
}
return pconn;
}
static int reverse_db_perhost_used(pool *p, struct proxy_dbh *dbh,
unsigned int vhost_id, int backend_id) {
int count, res;
const char *stmt, *errstr = NULL;
array_header *results;
/* To prevent database bloating too much, delete all of the entries
* in the table if we're over our limit.
*/
stmt = "SELECT COUNT(*) FROM proxy_vhost_reverse_per_host;";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
if (results->nelts != 1) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"expected 1 result from statement '%s', got %d", stmt,
results->nelts);
errno = EINVAL;
return -1;
}
count = atoi(((char **) results->elts)[0]);
if (count <= PROXY_REVERSE_DB_PERHOST_MAX_ENTRIES) {
return 0;
}
pr_trace_msg(trace_channel, 5,
"PerHost entry count (%d) exceeds max (%d), purging", count,
PROXY_REVERSE_DB_PERHOST_MAX_ENTRIES);
stmt = "DELETE FROM proxy_vhost_reverse_per_host;";
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
return 0;
}
/* ProxyReverseServers API/handling */
static int reverse_db_policy_init(pool *p, void *dbh, int policy_id,
unsigned int vhost_id, array_header *backends, unsigned long opts) {
int res, xerrno;
switch (policy_id) {
case PROXY_REVERSE_CONNECT_POLICY_RANDOM:
case PROXY_REVERSE_CONNECT_POLICY_LEAST_CONNS:
case PROXY_REVERSE_CONNECT_POLICY_LEAST_RESPONSE_TIME:
case PROXY_REVERSE_CONNECT_POLICY_PER_USER:
case PROXY_REVERSE_CONNECT_POLICY_PER_HOST:
/* No preparation needed at this time. */
res = 0;
break;
case PROXY_REVERSE_CONNECT_POLICY_ROUND_ROBIN: {
int backend_id = 0;
if (backends != NULL) {
backend_id = backends->nelts-1;
}
res = reverse_db_roundrobin_init(p, dbh, vhost_id, backend_id);
if (res < 0) {
xerrno = errno;
pr_log_debug(DEBUG3, MOD_PROXY_VERSION
": error preparing database for ProxyReverseConnectPolicy "
"RoundRobin: %s", strerror(xerrno));
errno = xerrno;
}
break;
}
case PROXY_REVERSE_CONNECT_POLICY_SHUFFLE:
if (backends != NULL) {
res = reverse_db_shuffle_init(p, dbh, vhost_id, backends);
if (res < 0) {
xerrno = errno;
pr_log_debug(DEBUG3, MOD_PROXY_VERSION
": error preparing database for ProxyReverseConnectPolicy "
"Shuffle: %s", strerror(xerrno));
errno = xerrno;
}
} else {
res = 0;
}
break;
case PROXY_REVERSE_CONNECT_POLICY_PER_GROUP:
if (!(opts & PROXY_OPT_USE_REVERSE_PROXY_AUTH)) {
pr_log_pri(PR_LOG_NOTICE, MOD_PROXY_VERSION
": PerGroup ProxyReverseConnectPolicy requires the "
"UseReverseProxyAuth ProxyOption");
errno = EPERM;
res = -1;
} else {
res = 0;
}
break;
default:
errno = EINVAL;
res = -1;
break;
}
return res;
}
static const struct proxy_conn *reverse_db_policy_next_backend(pool *p,
void *dbh, int policy_id, unsigned int vhost_id,
array_header *default_backends, const void *policy_data, int *backend_id) {
const struct proxy_conn *pconn = NULL;
struct proxy_conn **conns = NULL;
int idx = -1, nelts = 0;
if (db_backends != NULL) {
conns = db_backends->elts;
nelts = db_backends->nelts;
}
if (proxy_reverse_policy_is_sticky(policy_id) != TRUE) {
if (conns == NULL &&
db_backends == NULL) {
if (default_backends != NULL) {
conns = default_backends->elts;
nelts = default_backends->nelts;
} else {
/* Prevent possible null pointer dereferences later due to missing
* default URIs for non-sticky ConnectPolicy configurations.
*/
pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"missing required default/global ProxyReverseServers");
errno = EPERM;
return NULL;
}
}
}
switch (policy_id) {
case PROXY_REVERSE_CONNECT_POLICY_RANDOM:
idx = (int) proxy_random_next(0, nelts-1);
if (idx >= 0) {
pr_trace_msg(trace_channel, 11, "%s policy: selected index %d of %u",
proxy_reverse_policy_name(policy_id), idx, nelts-1);
pconn = conns[idx];
}
break;
case PROXY_REVERSE_CONNECT_POLICY_ROUND_ROBIN:
idx = reverse_db_roundrobin_next(p, dbh, vhost_id);
if (idx >= 0) {
pr_trace_msg(trace_channel, 11, "%s policy: selected index %d of %u",
proxy_reverse_policy_name(policy_id), idx, nelts-1);
pconn = conns[idx];
}
break;
case PROXY_REVERSE_CONNECT_POLICY_SHUFFLE:
idx = reverse_db_shuffle_next(p, dbh, vhost_id);
if (idx >= 0) {
pr_trace_msg(trace_channel, 11, "%s policy: selected index %d of %u",
proxy_reverse_policy_name(policy_id), idx, nelts-1);
pconn = conns[idx];
}
break;
case PROXY_REVERSE_CONNECT_POLICY_LEAST_CONNS:
idx = reverse_db_leastconns_next(p, dbh, vhost_id);
if (idx >= 0) {
pr_trace_msg(trace_channel, 11, "%s policy: selected index %d of %u",
proxy_reverse_policy_name(policy_id), idx, nelts-1);
pconn = conns[idx];
}
break;
case PROXY_REVERSE_CONNECT_POLICY_LEAST_RESPONSE_TIME:
idx = reverse_db_leastresponsetime_next(p, dbh, vhost_id);
if (idx >= 0) {
pr_trace_msg(trace_channel, 11, "%s policy: selected index %d of %u",
proxy_reverse_policy_name(policy_id), idx, nelts-1);
pconn = conns[idx];
}
break;
case PROXY_REVERSE_CONNECT_POLICY_PER_USER:
pconn = reverse_db_peruser_next(p, dbh, vhost_id, policy_data);
if (pconn != NULL) {
pr_trace_msg(trace_channel, 11,
"%s policy: selected backend '%.100s' for user '%s'",
proxy_reverse_policy_name(policy_id), proxy_conn_get_uri(pconn),
(const char *) policy_data);
}
break;
case PROXY_REVERSE_CONNECT_POLICY_PER_GROUP:
pconn = reverse_db_pergroup_next(p, dbh, vhost_id, policy_data);
if (pconn != NULL) {
pr_trace_msg(trace_channel, 11,
"%s policy: selected backend '%.100s' for user '%s'",
proxy_reverse_policy_name(policy_id), proxy_conn_get_uri(pconn),
(const char *) policy_data);
}
break;
case PROXY_REVERSE_CONNECT_POLICY_PER_HOST:
pconn = reverse_db_perhost_next(p, dbh, vhost_id, session.c->remote_addr);
if (pconn != NULL) {
pr_trace_msg(trace_channel, 11,
"%s policy: selected backend '%.100s' for host '%s'",
proxy_reverse_policy_name(policy_id), proxy_conn_get_uri(pconn),
pr_netaddr_get_ipstr(session.c->remote_addr));
}
break;
default:
errno = ENOSYS;
return NULL;
}
if (backend_id != NULL) {
*backend_id = idx;
}
return pconn;
}
static int reverse_db_policy_update_backend(pool *p, void *dbh, int policy_id,
unsigned vhost_id, int backend_id, int conn_incr, long connect_ms) {
/* Increment the conn count for this backend ID. */
int res, idx = 1;
const char *stmt, *errstr = NULL;
array_header *results;
/* If our ReverseConnectPolicy is one of PerUser, PerGroup, or PerHost,
* we can skip this step: those policies do not use the connection count/time.
* This also helps avoid database contention under load for these policies.
*/
if (proxy_reverse_policy_is_sticky(policy_id) == TRUE) {
pr_trace_msg(trace_channel, 17,
"sticky policy %s does not require updates, skipping",
proxy_reverse_policy_name(policy_id));
return 0;
}
/* TODO: Right now, we simply overwrite/track the very latest connect ms.
* But this could unfairly skew policies such as LeastResponseTime, as when
* the server in question had higher latency for that particular connection,
* due to e.g. OCSP response cache expiration.
*
* Another way would to be average the given connect ms with the previous
* one (if present), and store that. Something to ponder for the future.
*/
if (connect_ms > 0) {
stmt = "UPDATE proxy_vhost_backends SET conn_count = conn_count + ?, connect_ms = ? WHERE vhost_id = ? AND backend_id = ?;";
} else {
stmt = "UPDATE proxy_vhost_backends SET conn_count = conn_count + ? WHERE vhost_id = ? AND backend_id = ?;";
}
res = proxy_db_prepare_stmt(p, dbh, stmt);
if (res < 0) {
return -1;
}
res = proxy_db_bind_stmt(p, dbh, stmt, idx, PROXY_DB_BIND_TYPE_INT,
(void *) &conn_incr, 0);
if (res < 0) {
return -1;
}
idx++;
if (connect_ms > 0) {
res = proxy_db_bind_stmt(p, dbh, stmt, idx, PROXY_DB_BIND_TYPE_LONG,
(void *) &connect_ms, 0);
if (res < 0) {
return -1;
}
idx++;
}
res = proxy_db_bind_stmt(p, dbh, stmt, idx, PROXY_DB_BIND_TYPE_INT,
(void *) &vhost_id, 0);
if (res < 0) {
return -1;
}
idx++;
res = proxy_db_bind_stmt(p, dbh, stmt, idx, PROXY_DB_BIND_TYPE_INT,
(void *) &backend_id, 0);
if (res < 0) {
return -1;
}
results = proxy_db_exec_prepared_stmt(p, dbh, stmt, &errstr);
if (results == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error executing '%s': %s", stmt, errstr ? errstr : strerror(errno));
errno = EPERM;
return -1;
}
return 0;
}
static int reverse_db_policy_used_backend(pool *p, void *dbh, int policy_id,
unsigned int vhost_id, int idx) {
int res;
switch (policy_id) {
case PROXY_REVERSE_CONNECT_POLICY_RANDOM:
res = 0;
break;
case PROXY_REVERSE_CONNECT_POLICY_ROUND_ROBIN:
res = reverse_db_roundrobin_used(p, dbh, vhost_id, idx);
break;
case PROXY_REVERSE_CONNECT_POLICY_SHUFFLE:
res = reverse_db_shuffle_used(p, dbh, vhost_id, idx);
break;
case PROXY_REVERSE_CONNECT_POLICY_LEAST_CONNS:
res = reverse_db_leastconns_used(p, dbh, vhost_id, idx);
break;
case PROXY_REVERSE_CONNECT_POLICY_LEAST_RESPONSE_TIME:
res = reverse_db_leastresponsetime_used(p, dbh, vhost_id, idx);
break;
case PROXY_REVERSE_CONNECT_POLICY_PER_USER:
res = reverse_db_peruser_used(p, dbh, vhost_id, idx);
break;
case PROXY_REVERSE_CONNECT_POLICY_PER_GROUP:
res = reverse_db_pergroup_used(p, dbh, vhost_id, idx);
break;
case PROXY_REVERSE_CONNECT_POLICY_PER_HOST:
res = reverse_db_perhost_used(p, dbh, vhost_id, idx);
break;
default:
errno = ENOSYS;
return -1;
}
if (res < 0) {
int xerrno = errno;
errno = xerrno;
return -1;
}
return 0;
}
static void *reverse_db_init(pool *p, const char *tables_path, int flags) {
int db_flags, res, xerrno = 0;
const char *db_path = NULL;
server_rec *s;
struct proxy_dbh *dbh;
if (tables_path == NULL) {
errno = EINVAL;
return NULL;
}
db_path = pdircat(p, tables_path, "proxy-reverse.db", NULL);
db_flags = PROXY_DB_OPEN_FL_SCHEMA_VERSION_CHECK|PROXY_DB_OPEN_FL_INTEGRITY_CHECK|PROXY_DB_OPEN_FL_VACUUM;
if (flags & PROXY_DB_OPEN_FL_SKIP_VACUUM) {
/* If the caller needs us to skip the vacuum, we will. */
db_flags &= ~PROXY_DB_OPEN_FL_VACUUM;
}
PRIVS_ROOT
dbh = proxy_db_open_with_version(p, db_path, PROXY_REVERSE_DB_SCHEMA_NAME,
PROXY_REVERSE_DB_SCHEMA_VERSION, db_flags);
xerrno = errno;
PRIVS_RELINQUISH
if (dbh == NULL) {
(void) pr_log_pri(PR_LOG_NOTICE, MOD_PROXY_VERSION
": error opening database '%s' for schema '%s', version %u: %s",
db_path, PROXY_REVERSE_DB_SCHEMA_NAME, PROXY_REVERSE_DB_SCHEMA_VERSION,
strerror(xerrno));
errno = xerrno;
return NULL;
}
res = reverse_db_add_schema(p, dbh, db_path);
if (res < 0) {
xerrno = errno;
(void) pr_log_debug(DEBUG0, MOD_PROXY_VERSION
": error creating schema in database '%s' for '%s': %s", db_path,
PROXY_REVERSE_DB_SCHEMA_NAME, strerror(xerrno));
(void) proxy_db_close(p, dbh);
errno = xerrno;
return NULL;
}
res = reverse_db_truncate_tables(p, dbh);
if (res < 0) {
xerrno = errno;
(void) proxy_db_close(p, dbh);
errno = xerrno;
return NULL;
}
for (s = (server_rec *) server_list->xas_list; s; s = s->next) {
config_rec *c;
array_header *backends = NULL;
res = reverse_db_add_vhost(p, dbh, s);
if (res < 0) {
xerrno = errno;
(void) pr_log_debug(DEBUG0, MOD_PROXY_VERSION
": error adding database entry for server '%s' in schema '%s': %s",
s->ServerName, PROXY_REVERSE_DB_SCHEMA_NAME, strerror(xerrno));
(void) proxy_db_close(p, dbh);
errno = xerrno;
return NULL;
}
c = find_config(s->conf, CONF_PARAM, "ProxyReverseServers", FALSE);
while (c != NULL) {
const char *uri;
pr_signals_handle();
uri = c->argv[1];
if (uri != NULL) {
int defer = FALSE;
/* Handling of sql:// URIs is done later, in the session init
* call, assuming we've connected to a SQL server.
*/
if (strncmp(uri, "sql:/", 5) == 0) {
defer = TRUE;
}
/* Skip any %U- or %g-bearing URIs. */
if (defer == FALSE &&
(strstr(uri, "%U") != NULL ||
strstr(uri, "%g") != NULL)) {
defer = TRUE;
}
if (defer) {
c = find_config_next(c, c->next, CONF_PARAM, "ProxyReverseServers",
FALSE);
continue;
}
}
if (backends == NULL) {
backends = c->argv[0];
} else {
array_cat(backends, c->argv[0]);
}
c = find_config_next(c, c->next, CONF_PARAM, "ProxyReverseServers",
FALSE);
}
/* What if ALL of the ProxyReverseServers are deferred? In that case, we
* have no backend servers to add at this time.
*/
if (backends != NULL) {
res = reverse_db_add_backends(p, dbh, s->sid, backends);
if (res < 0) {
xerrno = errno;
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error adding database entries for ProxyReverseServers: %s",
strerror(xerrno));
(void) proxy_db_close(p, dbh);
errno = xerrno;
return NULL;
}
}
}
return dbh;
}
static int reverse_db_close(pool *p, void *dbh) {
if (p == NULL) {
errno = EINVAL;
return -1;
}
/* TODO: Implement any necessary cleanup */
if (dbh != NULL) {
if (proxy_db_close(p, dbh) < 0) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error detaching database with schema '%s': %s",
PROXY_REVERSE_DB_SCHEMA_NAME, strerror(errno));
}
}
return 0;
}
static void *reverse_db_open(pool *p, const char *tables_path,
array_header *backends) {
int xerrno = 0;
struct proxy_dbh *dbh;
const char *db_path;
db_path = pdircat(p, tables_path, "proxy-reverse.db", NULL);
/* Make sure we have our own per-session database handle, per SQLite3
* recommendation.
*/
PRIVS_ROOT
dbh = proxy_db_open_with_version(p, db_path, PROXY_REVERSE_DB_SCHEMA_NAME,
PROXY_REVERSE_DB_SCHEMA_VERSION, 0);
xerrno = errno;
PRIVS_RELINQUISH
if (dbh == NULL) {
(void) pr_log_writefile(proxy_logfd, MOD_PROXY_VERSION,
"error opening database '%s' for schema '%s', version %u: %s",
db_path, PROXY_REVERSE_DB_SCHEMA_NAME, PROXY_REVERSE_DB_SCHEMA_VERSION,
strerror(xerrno));
errno = xerrno;
return NULL;
}
db_backends = backends;
return dbh;
}
int proxy_reverse_db_as_datastore(struct proxy_reverse_datastore *ds,
void *ds_data, size_t ds_datasz) {
if (ds == NULL) {
errno = EINVAL;
return -1;
}
(void) ds_data;
(void) ds_datasz;
ds->policy_init = reverse_db_policy_init;
ds->policy_next_backend = reverse_db_policy_next_backend;
ds->policy_used_backend = reverse_db_policy_used_backend;
ds->policy_update_backend = reverse_db_policy_update_backend;
ds->init = reverse_db_init;
ds->open = reverse_db_open;
ds->close = reverse_db_close;
return 0;
}
|