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
|
#include "nmap.h"
#include "nbase.h"
#include "nmap_error.h"
#include "portlist.h"
#include "nsock.h"
#include "NmapOps.h"
#include "timing.h"
#include "Target.h"
#include "nmap_tty.h"
#include "xml.h"
#include "nse_main.h"
#include "nse_utility.h"
#include "nse_fs.h"
#include "nse_nsock.h"
#include "nse_nmaplib.h"
#include "nse_bit.h"
#include "nse_binlib.h"
#include "nse_pcrelib.h"
#include "nse_openssl.h"
#include "nse_debug.h"
#define NSE_MAIN "NSE_MAIN" /* the main function */
/* Script Scan phases */
#define NSE_PRE_SCAN "NSE_PRE_SCAN"
#define NSE_SCAN "NSE_SCAN"
#define NSE_POST_SCAN "NSE_POST_SCAN"
/* These are indices into the registry, for data shared with nse_main.lua. The
definitions here must match those in nse_main.lua. */
#define NSE_YIELD "NSE_YIELD"
#define NSE_BASE "NSE_BASE"
#define NSE_WAITING_TO_RUNNING "NSE_WAITING_TO_RUNNING"
#define NSE_DESTRUCTOR "NSE_DESTRUCTOR"
#define NSE_SELECTED_BY_NAME "NSE_SELECTED_BY_NAME"
#define NSE_CURRENT_HOSTS "NSE_CURRENT_HOSTS"
#define NSE_FORMAT_TABLE "NSE_FORMAT_TABLE"
#define NSE_FORMAT_XML "NSE_FORMAT_XML"
#ifndef MAXPATHLEN
# define MAXPATHLEN 2048
#endif
extern NmapOps o;
/* global object to store Pre-Scan and Post-Scan script results */
static ScriptResults script_scan_results;
static int timedOut (lua_State *L)
{
Target *target = nseU_gettarget(L, 1);
lua_pushboolean(L, target->timedOut(NULL));
return 1;
}
static int startTimeOutClock (lua_State *L)
{
Target *target = nseU_gettarget(L, 1);
if (!target->timeOutClockRunning())
target->startTimeOutClock(NULL);
return 0;
}
static int stopTimeOutClock (lua_State *L)
{
Target *target = nseU_gettarget(L, 1);
if (target->timeOutClockRunning())
target->stopTimeOutClock(NULL);
return 0;
}
static int next_port (lua_State *L)
{
lua_settop(L, 2);
lua_pushvalue(L, lua_upvalueindex(1));
lua_pushvalue(L, 2);
if (lua_next(L, -2) == 0)
return 0;
else {
lua_pop(L, 1); /* pop boolean value */
return 1;
}
}
static int ports (lua_State *L)
{
static const int states[] = {
PORT_OPEN,
PORT_OPENFILTERED,
PORT_UNFILTERED,
PORT_HIGHEST_STATE /* last one marks end */
};
Target *target = nseU_gettarget(L, 1);
PortList *plist = &(target->ports);
Port *current = NULL;
Port port;
lua_newtable(L);
for (int i = 0; states[i] != PORT_HIGHEST_STATE; i++)
while ((current = plist->nextPort(current, &port, TCPANDUDPANDSCTP,
states[i])) != NULL)
{
lua_newtable(L);
set_portinfo(L, target, current);
lua_pushboolean(L, 1);
lua_rawset(L, -3);
}
lua_pushcclosure(L, next_port, 1);
lua_pushnil(L);
lua_pushnil(L);
return 3;
}
static int script_set_output (lua_State *L)
{
ScriptResult sr;
sr.set_id(luaL_checkstring(L, 1));
sr.set_output_tab(L, 2);
if (!lua_isnil(L, 3)) {
lua_len(L, 3);
sr.set_output_str(luaL_checkstring(L, 3), luaL_checkint(L,-1));
}
script_scan_results.push_back(sr);
return 0;
}
static int host_set_output (lua_State *L)
{
ScriptResult sr;
Target *target = nseU_gettarget(L, 1);
sr.set_id(luaL_checkstring(L, 2));
sr.set_output_tab(L, 3);
if (!lua_isnil(L, 4)) {
lua_len(L, 4);
sr.set_output_str(luaL_checkstring(L, 4), luaL_checkint(L,-1));
}
target->scriptResults.push_back(sr);
return 0;
}
static int port_set_output (lua_State *L)
{
Port *p;
Port port;
ScriptResult sr;
Target *target = nseU_gettarget(L, 1);
p = nseU_getport(L, target, &port, 2);
sr.set_id(luaL_checkstring(L, 3));
sr.set_output_tab(L, 4);
if (!lua_isnil(L, 5)) {
lua_len(L, 5);
sr.set_output_str(luaL_checkstring(L, 5), luaL_checkint(L,-1));
}
target->ports.addScriptResult(p->portno, p->proto, sr);
target->ports.numscriptresults++;
return 0;
}
static int key_was_pressed (lua_State *L)
{
lua_pushboolean(L, keyWasPressed());
return 1;
}
static int scp (lua_State *L)
{
static const char * const ops[] = {"printStats", "printStatsIfNecessary",
"mayBePrinted", "endTask", NULL};
ScanProgressMeter *progress =
(ScanProgressMeter *) lua_touserdata(L, lua_upvalueindex(1));
switch (luaL_checkoption(L, 1, NULL, ops))
{
case 0: /* printStats */
progress->printStats((double) luaL_checknumber(L, 2), NULL);
break;
case 1:
progress->printStatsIfNecessary((double) luaL_checknumber(L, 2), NULL);
break;
case 2: /*mayBePrinted */
lua_pushboolean(L, progress->mayBePrinted(NULL));
return 1;
case 3: /* endTask */
progress->endTask(NULL, NULL);
delete progress;
break;
}
return 0;
}
static int scan_progress_meter (lua_State *L)
{
lua_pushlightuserdata(L, new ScanProgressMeter(luaL_checkstring(L, 1)));
lua_pushcclosure(L, scp, 1);
return 1;
}
/* This is like nmap.log_write, but doesn't append "NSE:" to the beginning of
messages. It is only used internally by nse_main.lua and is not available to
scripts. */
static int l_log_write(lua_State *L)
{
static const char *const ops[] = {"stdout", "stderr", NULL};
static const int logs[] = {LOG_STDOUT, LOG_STDERR};
int log = logs[luaL_checkoption(L, 1, NULL, ops)];
log_write(log, "%s", luaL_checkstring(L, 2));
return 0;
}
static int l_xml_start_tag(lua_State *L)
{
const char *name;
name = luaL_checkstring(L, 1);
xml_open_start_tag(name);
if (lua_isnoneornil(L, 2)) {
lua_newtable(L);
lua_replace(L, 2);
}
for (lua_pushnil(L); lua_next(L, 2); lua_pop(L, 1))
xml_attribute(luaL_checkstring(L, -2), "%s", luaL_checkstring(L, -1));
xml_close_start_tag();
return 0;
}
static int l_xml_end_tag(lua_State *L)
{
xml_end_tag();
return 0;
}
static int l_xml_write_escaped(lua_State *L)
{
const char *text;
text = luaL_checkstring(L, 1);
xml_write_escaped("%s", text);
return 0;
}
static int l_xml_newline(lua_State *L)
{
xml_newline();
return 0;
}
static int l_protect_xml(lua_State *L)
{
const char *text;
size_t len;
std::string output;
text = luaL_checklstring(L, 1, &len);
output = protect_xml(std::string(text, len));
lua_pushlstring(L, output.c_str(), output.size());
return 1;
}
static int nse_fetch (lua_State *L, int (*fetch)(char *, size_t, const char *))
{
char path[MAXPATHLEN];
switch (fetch(path, sizeof(path), luaL_checkstring(L, 1)))
{
case 0: // no such path
lua_pushnil(L);
lua_pushfstring(L, "no path to file/directory: %s", lua_tostring(L, 1));
break;
case 1: // file returned
lua_pushliteral(L, "file");
lua_pushstring(L, path);
break;
case 2: // directory returned
lua_pushliteral(L, "directory");
lua_pushstring(L, path);
break;
default:
return luaL_error(L, "nse_fetch returned bad code");
}
return 2;
}
static bool filename_is_absolute(const char *file) {
if (file[0] == '/')
return true;
#ifdef WIN32
if ((file[0] != '\0' && file[1] == ':') || file[0] == '\\')
return true;
#endif
return false;
}
/* This is a modification of nmap_fetchfile that first looks for an
* absolute file name.
*/
static int nse_fetchfile_absolute(char *path, size_t path_len, const char *file) {
if (filename_is_absolute(file)) {
if (o.debugging > 1)
log_write(LOG_STDOUT, "%s: Trying absolute path %s\n", SCRIPT_ENGINE, file);
Strncpy(path, file, path_len);
return file_is_readable(file);
}
return nmap_fetchfile(path, path_len, file);
}
/* This is a modification of nmap_fetchfile specialized to look for files
* in the scripts subdirectory. If the path is absolute, it is always tried
* verbatim. Otherwise, the file is looked for under scripts/, and then finally
* in the current directory.
*/
static int nse_fetchscript(char *path, size_t path_len, const char *file) {
std::string scripts_path = std::string(SCRIPT_ENGINE_LUA_DIR) + std::string(file);
int type;
if (filename_is_absolute(file)) {
if (o.debugging > 1)
log_write(LOG_STDOUT, "%s: Trying absolute path %s\n", SCRIPT_ENGINE, file);
Strncpy(path, file, path_len);
return file_is_readable(file);
}
// lets look in <path>/scripts
type = nmap_fetchfile(path, path_len, scripts_path.c_str());
if (type == 0) {
// current directory
Strncpy(path, file, path_len);
return file_is_readable(file);
}
return type;
}
static int fetchscript (lua_State *L)
{
return nse_fetch(L, nse_fetchscript);
}
static int fetchfile_absolute (lua_State *L)
{
return nse_fetch(L, nse_fetchfile_absolute);
}
static void open_cnse (lua_State *L)
{
static const luaL_Reg nse[] = {
{"fetchfile_absolute", fetchfile_absolute},
{"fetchscript", fetchscript},
{"key_was_pressed", key_was_pressed},
{"scan_progress_meter", scan_progress_meter},
{"timedOut", timedOut},
{"startTimeOutClock", startTimeOutClock},
{"stopTimeOutClock", stopTimeOutClock},
{"ports", ports},
{"script_set_output", script_set_output},
{"host_set_output", host_set_output},
{"port_set_output", port_set_output},
{"log_write", l_log_write},
{"xml_start_tag", l_xml_start_tag},
{"xml_end_tag", l_xml_end_tag},
{"xml_write_escaped", l_xml_write_escaped},
{"xml_newline", l_xml_newline},
{"protect_xml", l_protect_xml},
{NULL, NULL}
};
luaL_newlib(L, nse);
/* Add some other fields */
nseU_setbfield(L, -1, "default", o.script == 1);
nseU_setbfield(L, -1, "scriptversion", o.scriptversion == 1);
nseU_setbfield(L, -1, "scriptupdatedb", o.scriptupdatedb == 1);
nseU_setbfield(L, -1, "scripthelp", o.scripthelp);
nseU_setsfield(L, -1, "script_dbpath", SCRIPT_ENGINE_DATABASE);
nseU_setsfield(L, -1, "scriptargs", o.scriptargs);
nseU_setsfield(L, -1, "scriptargsfile", o.scriptargsfile);
nseU_setsfield(L, -1, "NMAP_URL", NMAP_URL);
}
/* Global persistent Lua state used by the engine. */
static lua_State *L_NSE = NULL;
void ScriptResult::clear (void)
{
if (o.debugging > 3)
log_write(LOG_STDOUT, "ScriptResult::clear %d id %s\n", output_ref, get_id());
luaL_unref(L_NSE, LUA_REGISTRYINDEX, output_ref);
output_ref = LUA_NOREF;
}
void ScriptResult::set_output_tab (lua_State *L, int pos)
{
clear();
lua_pushvalue(L, pos);
output_ref = luaL_ref(L_NSE, LUA_REGISTRYINDEX);
if (o.debugging > 3)
log_write(LOG_STDOUT, "ScriptResult::set_output_tab %d id %s\n", output_ref, get_id());
}
void ScriptResult::set_output_str (const char *out)
{
output_str = std::string(out);
}
void ScriptResult::set_output_str (const char *out, size_t len)
{
output_str = std::string(out, len);
}
static std::string format_obj(lua_State *L, int pos)
{
std::string output;
pos = lua_absindex(L, pos);
/* Look up the FORMAT_TABLE function from nse_main.lua and call it. */
lua_getfield(L, LUA_REGISTRYINDEX, NSE_FORMAT_TABLE);
if (lua_isnil(L, -1)) {
log_write(LOG_STDOUT, "%s: Cannot find function _R[\"%s\"] that should be in nse_main.lua\n",
SCRIPT_ENGINE, NSE_FORMAT_TABLE);
lua_pop(L, 1);
return output;
}
lua_pushvalue(L, pos);
if (lua_pcall(L, 1, 1, 0) != 0) {
if (o.debugging)
log_write(LOG_STDOUT, "%s: Error in FORMAT_TABLE: %s\n", SCRIPT_ENGINE, lua_tostring(L, -1));
lua_pop(L, 1);
return output;
}
lua_len(L, -1);
output = std::string(lua_tostring(L, -2), luaL_checkint(L, -1));
lua_pop(L, 1);
return output;
}
std::string ScriptResult::get_output_str (void) const
{
std::string output;
/* Explicit string output? */
if (!output_str.empty())
return output_str;
/* Auto-formatted table output? */
lua_rawgeti(L_NSE, LUA_REGISTRYINDEX, output_ref);
if (!lua_isnil(L_NSE, -1))
output = format_obj(L_NSE, -1);
lua_pop(L_NSE, 1);
return output;
}
void ScriptResult::set_id (const char *ident)
{
id = std::string(ident);
}
const char *ScriptResult::get_id (void) const
{
return id.c_str();
}
ScriptResults *get_script_scan_results_obj (void)
{
return &script_scan_results;
}
static void format_xml(lua_State *L, int pos)
{
pos = lua_absindex(L, pos);
/* Look up the FORMAT_XML function from nse_main.lua and call it. */
lua_getfield(L, LUA_REGISTRYINDEX, NSE_FORMAT_XML);
if (lua_isnil(L, -1)) {
log_write(LOG_STDOUT, "%s: Cannot find function _R[\"%s\"] that should be in nse_main.lua\n",
SCRIPT_ENGINE, NSE_FORMAT_XML);
lua_pop(L, 1);
return;
}
lua_pushvalue(L, pos);
if (lua_pcall(L, 1, 1, 0) != 0) {
if (o.debugging)
log_write(LOG_STDOUT, "%s: Error in FORMAT_XML: %s\n", SCRIPT_ENGINE, lua_tostring(L, -1));
lua_pop(L, 1);
return;
}
}
void ScriptResult::write_xml() const
{
std::string output_str;
xml_open_start_tag("script");
xml_attribute("id", "%s", get_id());
output_str = get_output_str();
if (!output_str.empty())
xml_attribute("output", "%s", protect_xml(output_str).c_str());
/* Any table output? */
lua_rawgeti(L_NSE, LUA_REGISTRYINDEX, output_ref);
if (!lua_isnil(L_NSE, -1)) {
xml_close_start_tag();
format_xml(L_NSE, -1);
xml_end_tag();
} else {
xml_close_empty_tag();
}
lua_pop(L_NSE, 1);
}
/* int panic (lua_State *L)
*
* Panic function set via lua_atpanic().
*/
static int panic (lua_State *L)
{
const char *err = lua_tostring(L, 1);
fatal("Unprotected error in Lua:\n%s\n", err);
return 0;
}
static void set_nmap_libraries (lua_State *L)
{
static const luaL_Reg libs[] = {
{NSE_PCRELIBNAME, luaopen_pcrelib},
{NSE_NMAPLIBNAME, luaopen_nmap},
{NSE_BINLIBNAME, luaopen_binlib},
{BITLIBNAME, luaopen_bit},
{LFSLIBNAME, luaopen_lfs},
#ifdef HAVE_OPENSSL
{OPENSSLLIBNAME, luaopen_openssl},
#endif
{NULL, NULL}
};
for (int i = 0; libs[i].name; i++) {
luaL_requiref(L, libs[i].name, libs[i].func, 1);
lua_pop(L, 1);
}
}
static int init_main (lua_State *L)
{
char path[MAXPATHLEN];
std::vector<std::string> *rules = (std::vector<std::string> *)
lua_touserdata(L, 1);
/* Load some basic libraries */
luaL_openlibs(L);
set_nmap_libraries(L);
lua_newtable(L);
lua_setfield(L, LUA_REGISTRYINDEX, NSE_CURRENT_HOSTS);
if (nmap_fetchfile(path, sizeof(path), "nse_main.lua") != 1)
luaL_error(L, "could not locate nse_main.lua");
if (luaL_loadfile(L, path) != 0)
luaL_error(L, "could not load nse_main.lua: %s", lua_tostring(L, -1));
/* The first argument to the NSE Main Lua code is the private nse
* library table which exposes certain necessary C functions to
* the Lua engine.
*/
open_cnse(L); /* first argument */
/* The second argument is the script rules, including the
* files/directories/categories passed as the userdata to this function.
*/
lua_createtable(L, rules->size(), 0); /* second argument */
for (std::vector<std::string>::iterator si = rules->begin(); si != rules->end(); si++)
nseU_appendfstr(L, -1, "%s", si->c_str());
lua_call(L, 2, 1); /* returns the NSE main function */
lua_setfield(L, LUA_REGISTRYINDEX, NSE_MAIN);
return 0;
}
static int run_main (lua_State *L)
{
std::vector<Target *> *targets = (std::vector<Target*> *)
lua_touserdata(L, 1);
/* New host group */
lua_newtable(L);
lua_setfield(L, LUA_REGISTRYINDEX, NSE_CURRENT_HOSTS);
lua_getfield(L, LUA_REGISTRYINDEX, NSE_MAIN);
assert(lua_isfunction(L, -1));
/* The first argument to the NSE main function is the list of targets. This
* has all the target names, 1-N, in a list.
*/
lua_createtable(L, targets->size(), 0);
int targets_table = lua_gettop(L);
lua_getfield(L, LUA_REGISTRYINDEX, NSE_CURRENT_HOSTS);
int current_hosts = lua_gettop(L);
for (std::vector<Target *>::iterator ti = targets->begin(); ti != targets->end(); ti++)
{
Target *target = (Target *) *ti;
const char *TargetName = target->TargetName();
const char *targetipstr = target->targetipstr();
lua_newtable(L);
set_hostinfo(L, target);
lua_rawseti(L, targets_table, lua_rawlen(L, targets_table) + 1);
if (TargetName != NULL && strcmp(TargetName, "") != 0)
lua_pushstring(L, TargetName);
else
lua_pushstring(L, targetipstr);
lua_pushlightuserdata(L, target);
lua_rawset(L, current_hosts); /* add to NSE_CURRENT_HOSTS */
}
lua_settop(L, targets_table);
/* Push script scan phase type. Second argument to NSE main function */
switch (o.current_scantype)
{
case SCRIPT_PRE_SCAN:
lua_pushliteral(L, NSE_PRE_SCAN);
break;
case SCRIPT_SCAN:
lua_pushliteral(L, NSE_SCAN);
break;
case SCRIPT_POST_SCAN:
lua_pushliteral(L, NSE_POST_SCAN);
break;
default:
fatal("%s: failed to set the script scan phase.\n", SCRIPT_ENGINE);
}
lua_call(L, 2, 0);
return 0;
}
/* int nse_yield (lua_State *L, int ctx, lua_CFunction k) [-?, +?, e]
*
* This function will yield the running thread back to NSE, even across script
* auxiliary coroutines. All NSE initiated yields must use this function. The
* correct and only way to call is as a tail call:
* return nse_yield(L, 0, NULL);
*/
int nse_yield (lua_State *L, int ctx, lua_CFunction k)
{
lua_getfield(L, LUA_REGISTRYINDEX, NSE_YIELD);
lua_pushthread(L);
lua_call(L, 1, 1); /* returns NSE_YIELD_VALUE */
return lua_yieldk(L, 1, ctx, k); /* yield with NSE_YIELD_VALUE */
}
/* void nse_restore (lua_State *L, int number) [-, -, e]
*
* Restore the thread 'L' back into the running NSE queue. 'number' is the
* number of values on the stack to be passed when the thread is resumed. This
* function may cause a panic due to extraordinary and unavoidable
* circumstances.
*/
void nse_restore (lua_State *L, int number)
{
luaL_checkstack(L, 5, "nse_restore: stack overflow");
lua_pushthread(L);
lua_getfield(L, LUA_REGISTRYINDEX, NSE_WAITING_TO_RUNNING);
lua_insert(L, -(number+2)); /* move WAITING_TO_RUNNING down below the args */
lua_insert(L, -(number+1)); /* move thread above WAITING_TO_RUNNING */
/* Call WAITING_TO_RUNNING (defined in nse_main.lua) on the thread and any
other arguments. */
if (lua_pcall(L, number+1, 0, 0) != 0)
fatal("%s: WAITING_TO_RUNNING error!\n%s", __func__, lua_tostring(L, -1));
}
/* void nse_destructor (lua_State *L, char what) [-(1|2), +0, e]
*
* This function adds (what = 'a') or removes (what = 'r') a destructor from
* the Thread owning the running Lua thread (L). A destructor is called when
* the thread finishes for any reason (including error). A unique key is used
* to associate with the destructor so it is removable later.
*
* what == 'r', destructor key on stack
* what == 'a', destructor key and destructor function on stack
*/
void nse_destructor (lua_State *L, char what)
{
assert(what == 'a' || what == 'r');
lua_getfield(L, LUA_REGISTRYINDEX, NSE_DESTRUCTOR);
lua_pushstring(L, what == 'a' ? "add" : "remove");
lua_pushthread(L);
if (what == 'a')
{
lua_pushvalue(L, -5); /* destructor key */
lua_pushvalue(L, -5); /* destructor */
}
else
{
lua_pushvalue(L, -4); /* destructor key */
lua_pushnil(L); /* no destructor, we are removing */
}
if (lua_pcall(L, 4, 0, 0) != 0)
fatal("%s: NSE_DESTRUCTOR error!\n%s", __func__, lua_tostring(L, -1));
lua_pop(L, what == 'a' ? 2 : 1);
}
/* void nse_base (lua_State *L) [-0, +1, e]
*
* Returns the base Lua thread (coroutine) for the running thread. The base
* thread is resumed by NSE (runs the action function). Other coroutines being
* used by the base thread may be in a chain of resumes, we use the base thread
* as the "holder" of resources (for the Nsock binding in particular).
*/
void nse_base (lua_State *L)
{
lua_getfield(L, LUA_REGISTRYINDEX, NSE_BASE);
lua_call(L, 0, 1); /* returns base thread */
}
/* void nse_selectedbyname (lua_State *L) [-0, +1, e]
*
* Returns a boolean signaling whether the running script was selected by name
* on the command line (--script).
*/
void nse_selectedbyname (lua_State *L)
{
lua_getfield(L, LUA_REGISTRYINDEX, NSE_SELECTED_BY_NAME);
if (lua_isnil(L, -1)) {
lua_pushboolean(L, 0);
lua_replace(L, -2);
} else {
lua_call(L, 0, 1);
}
}
/* void nse_gettarget (lua_State *L) [-0, +1, -]
*
* Given the index to a string on the stack identifying the host, an ip or a
* targetname (host name specified on the command line, see Target.h), returns
* a lightuserdatum that points to the host's Target (see Target.h). If the
* host cannot be found, nil is returned.
*/
void nse_gettarget (lua_State *L, int index)
{
lua_pushvalue(L, index);
lua_getfield(L, LUA_REGISTRYINDEX, NSE_CURRENT_HOSTS);
lua_insert(L, -2);
lua_rawget(L, -2);
lua_replace(L, -2);
}
void open_nse (void)
{
if (L_NSE == NULL)
{
/*
Set the random seed value on behalf of scripts. Since Lua uses the
C rand and srand functions, which have a static seed for the entire
program, we don't want scripts doing this themselves.
*/
srand(get_random_uint());
const lua_Number *version = lua_version(NULL);
double major = (*version) / 100.0;
double minor = fmod(*version, 10.0);
if (o.debugging >= 1)
log_write(LOG_STDOUT, "%s: Using Lua %.0f.%.0f.\n", SCRIPT_ENGINE, major, minor);
if (*version < 502)
fatal("%s: This version of NSE only works with Lua 5.2 or greater.", SCRIPT_ENGINE);
if ((L_NSE = luaL_newstate()) == NULL)
fatal("%s: failed to open a Lua state!", SCRIPT_ENGINE);
lua_atpanic(L_NSE, panic);
lua_settop(L_NSE, 0);
lua_pushcfunction(L_NSE, nseU_traceback);
lua_pushcfunction(L_NSE, init_main);
lua_pushlightuserdata(L_NSE, &o.chosenScripts);
if (lua_pcall(L_NSE, 1, 0, 1))
fatal("%s: failed to initialize the script engine:\n%s\n", SCRIPT_ENGINE, lua_tostring(L_NSE, -1));
lua_settop(L_NSE, 0);
}
}
void script_scan (std::vector<Target *> &targets, stype scantype)
{
o.current_scantype = scantype;
assert(L_NSE != NULL);
lua_settop(L_NSE, 0); /* clear the stack */
lua_pushcfunction(L_NSE, nseU_traceback);
lua_pushcfunction(L_NSE, run_main);
lua_pushlightuserdata(L_NSE, &targets);
if (lua_pcall(L_NSE, 1, 0, 1))
error("%s: Script Engine Scan Aborted.\nAn error was thrown by the "
"engine: %s", SCRIPT_ENGINE, lua_tostring(L_NSE, -1));
lua_settop(L_NSE, 0);
}
void close_nse (void)
{
if (L_NSE != NULL)
{
lua_close(L_NSE);
L_NSE = NULL;
}
}
|