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nse_main.cc

#include "nse_main.h"

#include "nse_init.h"
#include "nse_nsock.h"
#include "nse_nmaplib.h"
#include "nse_debug.h"
#include "nse_macros.h"

#include "nmap.h"
#include "nmap_error.h"
#include "portlist.h"
#include "nsock.h"
#include "NmapOps.h"
#include "timing.h"
#include "Target.h"
#include "nmap_tty.h"

extern NmapOps o;

struct run_record {
      short type; // 0 - hostrule; 1 - portrule
      Port* port;
      Target* host;
};

struct thread_record {
      lua_State* thread;
      int resume_arguments;
      unsigned int registry_idx; // index in the main state registry
      double runlevel;
      struct run_record rr;
};

int current_hosts = 0;
int errfunc = 0;
std::list<std::list<struct thread_record> > torun_scripts;
std::list<struct thread_record> running_scripts;
std::list<struct thread_record> waiting_scripts;

class CompareRunlevels {
public:
      bool operator() (const struct thread_record& lhs, const struct thread_record& rhs) {
            return lhs.runlevel < rhs.runlevel;
      }
};

// prior execution
int process_preparerunlevels(std::list<struct thread_record> torun_threads);
int process_preparehost(lua_State* L, Target* target, std::list<struct thread_record>& torun_threads);
int process_preparethread(lua_State* L, struct thread_record* tr);

// helper functions
int process_getScriptId(lua_State* L, ScriptResult * ssr);
int process_pickScriptsForPort(
            lua_State* L, 
            Target* target, 
            Port* port,
            std::list<thread_record>& torun_threads);

// execution
int process_mainloop(lua_State* L);
int process_waiting2running(lua_State* L, int resume_arguments);
int process_finalize(lua_State* L, unsigned int registry_idx);

// post execution
int cleanup_threads(std::list<struct thread_record> trs);

void ScriptResult::set_output (const char *out)
{
  output = std::string(out);
}

std::string ScriptResult::get_output (void)
{
  return output;
}

void ScriptResult::set_id (const char *ident)
{
  id = std::string(ident);
}

std::string ScriptResult::get_id (void)
{
  return id;
}

/* 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;
}

/* size_t table_length (lua_State *L, int index)
 *
 * Returns the length of the table at index index.
 * This length is the number of elements, not just array elements.
 */
size_t table_length (lua_State *L, int index)
{
  size_t len = 0;
  lua_pushvalue(L, index);
  lua_pushnil(L);
  while (lua_next(L, -2) != 0)
  {
    len++;
    lua_pop(L, 1);
  }
  lua_pop(L, 1); // table
  return len;
}

/* int escape_char (lua_State *L)
 *
 * This function is called via Lua through string.gsub. Its purpose is to
 * escape characters. So the first sole character is changed to "\xFF" (hex).
 */
static int escape_char (lua_State *L)
{
  char hold[10];
  const char *str = luaL_checkstring(L, 1);
  int size = sprintf(hold, "\\x%02X", *str & 0xff);
  lua_pushlstring(L, hold, size);
  return 1;
}

int script_updatedb (void)
{
  int status;
  int ret = SCRIPT_ENGINE_SUCCESS;
  lua_State *L;

  SCRIPT_ENGINE_VERBOSE(
      log_write(LOG_STDOUT, "%s: Updating rule database.\n", 
        SCRIPT_ENGINE);
      )

  L = luaL_newstate();
  if (L == NULL)
  {
    error("%s: Failed luaL_newstate()", SCRIPT_ENGINE);
    return 0;
  }
  lua_atpanic(L, panic);
  
  status = lua_cpcall(L, init_lua, NULL);
  if (status != 0)
  {
    error("%s: error while initializing Lua State:\n%s\n",
        SCRIPT_ENGINE, lua_tostring(L, -1));
    ret = SCRIPT_ENGINE_ERROR;
    goto finishup;
  }
  
  lua_settop(L, 0); // safety, is 0 anyway
  lua_rawgeti(L, LUA_REGISTRYINDEX, errfunc); // index 1

  lua_pushcclosure(L, init_updatedb, 0);
  status = lua_pcall(L, 0, 0, 1);
  if(status != 0)
  {
    error("%s: error while updating Script Database:\n%s\n",
        SCRIPT_ENGINE, lua_tostring(L, -1));
    ret = SCRIPT_ENGINE_ERROR;
    goto finishup;
  }
  
  log_write(LOG_STDOUT, "NSE script database updated successfully.\n");
  
  finishup:
    lua_close(L);
    if (ret != SCRIPT_ENGINE_SUCCESS)
    {
      error("%s: Aborting database update.\n", SCRIPT_ENGINE);
      return SCRIPT_ENGINE_ERROR;
    }
    else
      return SCRIPT_ENGINE_SUCCESS;
}

/* check the script-arguments provided to nmap (--script-args) before
 * scanning starts - otherwise the whole scan will run through and be
 * aborted before script-scanning 
 */
int script_check_args (void)
{
  int ret = SCRIPT_ENGINE_SUCCESS, status;
  lua_State* L = luaL_newstate();

  if (L == NULL)
    fatal("Error opening lua, for checking arguments\n");
  lua_atpanic(L, panic);

  /* set all global libraries (we'll need the string-lib) */
  status = lua_cpcall(L, init_lua, NULL);
  if (status != 0)
  {
    error("%s: error while initializing Lua State:\n%s\n",
        SCRIPT_ENGINE, lua_tostring(L, -1));
    ret = SCRIPT_ENGINE_ERROR;
    goto finishup;
  }

  lua_pushcclosure(L, init_parseargs, 0);
  lua_pushstring(L, o.scriptargs);
  lua_pcall(L, 1, 1, 0);

  if (!lua_isfunction(L, -1))
    ret = SCRIPT_ENGINE_ERROR;

  finishup:
      lua_close(L);
      return ret;
}

/* open a lua instance
 * open the lua standard libraries
 * open all the scripts and prepare them for execution
 *    (export nmap bindings, add them to host/port rulesets etc.)
 * apply all scripts on all hosts
 * */
int script_scan(std::vector<Target*> &targets) {
      int status;
      std::vector<Target*>::iterator target_iter;
      std::list<std::list<struct thread_record> >::iterator runlevel_iter;
      std::list<struct thread_record>::iterator thr_iter;
      std::list<struct thread_record> torun_threads;
    std::vector<std::string>::iterator script_iter;
      lua_State* L;

      o.current_scantype = SCRIPT_SCAN;

      SCRIPT_ENGINE_VERBOSE(
                  log_write(LOG_STDOUT, "%s: Initiating script scanning.\n", SCRIPT_ENGINE);
                  )

      SCRIPT_ENGINE_DEBUGGING(
            unsigned int tlen = targets.size();
            char targetstr[128];
            if(tlen > 1)
                  log_write(LOG_STDOUT, "%s: Script scanning %d hosts.\n", 
                        SCRIPT_ENGINE, tlen);
            else
                  log_write(LOG_STDOUT, "%s: Script scanning %s.\n", 
                        SCRIPT_ENGINE, (*targets.begin())->NameIP(targetstr, sizeof(targetstr)));
      )

      L = luaL_newstate();
      if (L == NULL) {
            error("%s: Failed luaL_newstate()", SCRIPT_ENGINE);
        return SCRIPT_ENGINE_ERROR;
      }
    lua_atpanic(L, panic);

    status = lua_cpcall(L, init_lua, NULL);
    if (status != 0)
    {
      error("%s: error while initializing Lua State:\n%s\n",
          SCRIPT_ENGINE, lua_tostring(L, -1));
      status = SCRIPT_ENGINE_ERROR;
      goto finishup;
    }

      //set the arguments - if provided
    status = lua_cpcall(L, init_setargs, NULL);
    if (status != 0)
    {
      error("%s: error while setting arguments for scripts:\n%s\n",
          SCRIPT_ENGINE, lua_tostring(L, -1));
      status = SCRIPT_ENGINE_ERROR;
      goto finishup;
    }

    lua_settop(L, 0); // safety, is 0 anyway
    lua_rawgeti(L, LUA_REGISTRYINDEX, errfunc); // index 1

    if (!lua_checkstack(L, o.chosenScripts.size() + 1))
    {
      error("%s: stack overflow at %s:%d", SCRIPT_ENGINE, __FILE__, __LINE__);
      status = SCRIPT_ENGINE_ERROR;
      goto finishup;
    }
    lua_pushcclosure(L, init_rules, 0);
    for (script_iter = o.chosenScripts.begin();
         script_iter != o.chosenScripts.end();
         script_iter++)
      lua_pushstring(L, script_iter->c_str());
    status = lua_pcall(L, o.chosenScripts.size(), 0, 1);
    if (status != 0)
    {
      error("%s: error while initializing script rules:\n%s\n",
          SCRIPT_ENGINE, lua_tostring(L, -1));
      status = SCRIPT_ENGINE_ERROR;
      goto finishup;
    }

      SCRIPT_ENGINE_DEBUGGING(log_write(LOG_STDOUT, "%s: Matching rules.\n", SCRIPT_ENGINE);)

      for(target_iter = targets.begin(); target_iter != targets.end(); target_iter++) {
            std::string key = ((Target*) (*target_iter))->targetipstr();
        lua_rawgeti(L, LUA_REGISTRYINDEX, current_hosts);
        lua_pushstring(L, key.c_str());
        lua_pushlightuserdata(L, (void *) *target_iter);
        lua_settable(L, -3);
        lua_pop(L, 1);

            status = process_preparehost(L, *target_iter, torun_threads);
            if(status != SCRIPT_ENGINE_SUCCESS){
                  goto finishup;
            }
      }

      status = process_preparerunlevels(torun_threads);
      if(status != SCRIPT_ENGINE_SUCCESS) {
            goto finishup;
      }

      SCRIPT_ENGINE_DEBUGGING(log_write(LOG_STDOUT, "%s: Running scripts.\n", SCRIPT_ENGINE);)
      
      for(runlevel_iter = torun_scripts.begin(); runlevel_iter != torun_scripts.end(); runlevel_iter++) {
            running_scripts = (*runlevel_iter);

            SCRIPT_ENGINE_DEBUGGING(log_write(LOG_STDOUT, "%s: Runlevel: %f\n", 
                              SCRIPT_ENGINE,
                              running_scripts.front().runlevel);)

            /* Start the time-out clocks for targets with scripts in this
             * runlevel.  The clock is stopped in process_finalize().
             */
            for (thr_iter = running_scripts.begin();
                 thr_iter != running_scripts.end();
                 thr_iter++)
                  if (!thr_iter->rr.host->timeOutClockRunning())
                        thr_iter->rr.host->startTimeOutClock(NULL);

            status = process_mainloop(L);
            if(status != SCRIPT_ENGINE_SUCCESS){
                  goto finishup;
            }
      }
      

finishup:
      SCRIPT_ENGINE_DEBUGGING(
                  log_write(LOG_STDOUT, "%s: Script scanning completed.\n", SCRIPT_ENGINE);
                  )
      lua_close(L);
      torun_scripts.clear();
      if(status != SCRIPT_ENGINE_SUCCESS) {
            error("%s: Aborting script scan.", SCRIPT_ENGINE);
            return SCRIPT_ENGINE_ERROR;
      } else {
            return SCRIPT_ENGINE_SUCCESS;
      }
}

int process_mainloop(lua_State *L) {
      int state;
      int unfinished = running_scripts.size() + waiting_scripts.size(); 
      struct thread_record current;
      ScanProgressMeter progress = ScanProgressMeter(SCRIPT_ENGINE);

      double total = (double) unfinished;
      double done = 0;

      std::list<struct thread_record>::iterator iter;
      struct timeval now;

      // while there are scripts in running or waiting state, we loop.
      // we rely on nsock_loop to protect us from busy loops when 
      // all scripts are waiting.
      while( unfinished > 0 ) {

            if(l_nsock_loop(50) == NSOCK_LOOP_ERROR) {
                  error("%s: An error occured in the nsock loop", SCRIPT_ENGINE);
                  return SCRIPT_ENGINE_ERROR;
            }

            unfinished = running_scripts.size() + waiting_scripts.size();

            if (keyWasPressed()) {
                  done = 1.0 - (((double) unfinished) / total);
                  if (o.verbose > 1 || o.debugging) {
                        log_write(LOG_STDOUT, "Active NSE scripts: %d\n", unfinished);
                        log_flush(LOG_STDOUT);
                  }
                  progress.printStats(done, NULL);
            }

            SCRIPT_ENGINE_VERBOSE(
                  if(progress.mayBePrinted(NULL)) { 
                        done = 1.0 - (((double) unfinished) / total);
                        if(o.verbose > 1 || o.debugging)
                              progress.printStats(done, NULL);
                        else
                              progress.printStatsIfNeccessary(done, NULL);
                  })

            gettimeofday(&now, NULL);

            for(iter = waiting_scripts.begin(); iter != waiting_scripts.end(); iter++)
                  if (iter->rr.host->timedOut(&now)) {
                        running_scripts.push_front((*iter));
                        waiting_scripts.erase(iter);
                        iter = waiting_scripts.begin();
                  }

       // Run the garbage collecter. FIXME: This can error in a __gc metamethod
       lua_gc(L, LUA_GCSTEP, 5);

        while (!running_scripts.empty()) {
                  current = *(running_scripts.begin());

                  if (current.rr.host->timedOut(&now))
                        state = LUA_ERRRUN;
                  else
                        state = lua_resume(current.thread, current.resume_arguments);
      
                  if(state == LUA_YIELD) {
                        // this script has performed a network io operation
                        // we put it in the waiting
                        // when the network io operation has completed,
                        // a callback from the nsock library will put the
                        // script back into the running state
                        
                        waiting_scripts.push_back(current);
                        running_scripts.pop_front();
                  } else if( state == 0) {
                        // this script has finished
                        // we first check if it produced output
                        // then we release the thread and remove it from the
                        // running_scripts list
      
                        if(lua_isstring (current.thread, 2)) { // FIXME
                    ScriptResult sr;
                    lua_State *thread = current.thread;
                              SCRIPT_ENGINE_TRY(process_getScriptId(thread, &sr));
                    lua_getfield(thread, 2, "gsub");
                    lua_pushvalue(thread, 2); // output FIXME
                    lua_pushliteral(thread, "[^%w%s%p]");
                    lua_pushcclosure(thread, escape_char, 0);
                    lua_call(thread, 3, 1);
                              sr.set_output(lua_tostring(thread, -1));
                              if(current.rr.type == 0) {
                                    current.rr.host->scriptResults.push_back(sr);
                              } else if(current.rr.type == 1) {
                                    current.rr.port->scriptResults.push_back(sr);
                                    current.rr.host->ports.numscriptresults++;
                              }
                              lua_pop(thread, 2);
                        }
      
                        SCRIPT_ENGINE_TRY(process_finalize(L, current.registry_idx));
                  } else {
                        // this script returned because of an error
                        // print the failing reason if the verbose level is high enough   
                        SCRIPT_ENGINE_DEBUGGING(
                              const char* errmsg = lua_tostring(current.thread, -1);
                              log_write(LOG_STDOUT, "%s: %s\n", SCRIPT_ENGINE, errmsg);
                        )
                        SCRIPT_ENGINE_TRY(process_finalize(L, current.registry_idx));
                  }
            } // while
      }

      progress.endTask(NULL, NULL);

      return SCRIPT_ENGINE_SUCCESS;
}

// If the target still has scripts in either running_scripts
// or waiting_scripts then it is still running.  This only
// pertains to scripts in the current runlevel.

int has_target_finished(Target *target) {
      std::list<struct thread_record>::iterator iter;

      for (iter = waiting_scripts.begin(); iter != waiting_scripts.end(); iter++)
            if (target == iter->rr.host) return 0;

      for (iter = running_scripts.begin(); iter != running_scripts.end(); iter++)
            if (target == iter->rr.host) return 0;

      return 1;
}

int process_finalize(lua_State* L, unsigned int registry_idx) {
      luaL_unref(L, LUA_REGISTRYINDEX, registry_idx);
      struct thread_record thr = running_scripts.front();

      running_scripts.pop_front();

      if (has_target_finished(thr.rr.host))
            thr.rr.host->stopTimeOutClock(NULL);

      return SCRIPT_ENGINE_SUCCESS;
}

int process_waiting2running(lua_State* L, int resume_arguments) {
      std::list<struct thread_record>::iterator iter;

      // find the lua state which has received i/o
      for(  iter = waiting_scripts.begin(); 
            (*iter).thread != L;
            iter++) {

            // It is very unlikely that a thread which
            // is not in the waiting queue tries to
            // continue
            // it does happen when they try to do socket i/o
            // inside a pcall

            // This also happens when we timeout a script
            // In this case, the script is still in the waiting
            // queue and we will have manually removed it from
            // the waiting queue so we just return.

            if(iter == waiting_scripts.end())
                  return SCRIPT_ENGINE_SUCCESS;
      }

      (*iter).resume_arguments = resume_arguments;

      // put the thread back into the running
      // queue
      //running_scripts.push_front((*iter));
      running_scripts.push_back((*iter));
      waiting_scripts.erase(iter);

      return SCRIPT_ENGINE_SUCCESS;
}

/* Tries to get the script id and store it in the script scan result structure
 * if no 'id' field is found, the filename field is used which we set in the 
 * setup phase. If someone changed the filename field to a nonstring we complain
 * */
int process_getScriptId(lua_State* L, ScriptResult *sr) {

      lua_getfield(L, 1, ID);
      lua_getfield(L, 1, FILENAME);

      if(lua_isstring(L, -2)) {
            sr->set_id(lua_tostring (L, -2));
      } else if(lua_isstring(L, -1)) {
            sr->set_id(lua_tostring (L, -1));
      } else {
            error("%s: The script has no 'id' entry, the 'filename' entry was changed to:",
                  SCRIPT_ENGINE);
            l_dumpValue(L, -1);
            return SCRIPT_ENGINE_ERROR;
      }

      lua_pop(L, 2);

      return SCRIPT_ENGINE_SUCCESS;
}

/* try all host and all port rules against the 
 * state of the current target
 * make a list with run records for the scripts
 * which want to run
 * process all scripts in the list
 * */
int process_preparehost(lua_State* L, Target* target, std::list<struct thread_record>& torun_threads) {
      PortList* plist = &(target->ports);
      Port* current = NULL;

      /* find the matching hostrules
       * */
      lua_getfield(L, LUA_REGISTRYINDEX, HOSTTESTS);
    lua_pushnil(L);
    while (lua_next(L, -2) != 0)
    {
      // Hostrule function & file closure on stack
      lua_pushvalue(L, -2); // hostrule function (key)
      lua_newtable(L);
      set_hostinfo(L, target); // hostrule argument
      SCRIPT_ENGINE_LUA_TRY(lua_pcall(L, 1, 1, 0));

      if (lua_isboolean(L, -1) && lua_toboolean(L, -1))
      {
          struct thread_record tr;
        tr.rr.type = 0;
        tr.rr.port = NULL;
        tr.rr.host = target;

        SCRIPT_ENGINE_TRY(process_preparethread(L, &tr));

        torun_threads.push_back(tr);

        SCRIPT_ENGINE_DEBUGGING(
            lua_getfenv(L, -2); // file closure environment
            lua_getfield(L, -1, FILENAME);
            log_write(LOG_STDOUT, "%s: Will run %s against %s\n",
              SCRIPT_ENGINE,
              lua_tostring(L, -1),
              target->targetipstr());
            lua_pop(L, 2);
            )
      }
      lua_pop(L, 2); // boolean and file closure
    }

      /* find the matching port rules
       * */
      lua_getfield(L, LUA_REGISTRYINDEX, PORTTESTS);

      /* because of the port iteration API we need to awkwardly iterate
       * over the kinds of ports we're interested in explictely.
       * */
      current = NULL;
      while((current = plist->nextPort(current, TCPANDUDP, PORT_OPEN)) != NULL) {
            SCRIPT_ENGINE_TRY(process_pickScriptsForPort(L, target, current, torun_threads));
      }

      while((current = plist->nextPort(current, TCPANDUDP, PORT_OPENFILTERED)) != NULL) {
            SCRIPT_ENGINE_TRY(process_pickScriptsForPort(L, target, current, torun_threads));
      }

      while((current = plist->nextPort(current, TCPANDUDP, PORT_UNFILTERED)) != NULL) {
            SCRIPT_ENGINE_TRY(process_pickScriptsForPort(L, target, current, torun_threads));
      }

      lua_pop(L, 2); // Hostrules, Portrules

      return SCRIPT_ENGINE_SUCCESS;
}

int process_preparerunlevels(std::list<struct thread_record> torun_threads) {
      std::list<struct thread_record> current_runlevel;
      std::list<struct thread_record>::iterator runlevel_iter;
      double runlevel_idx = 0.0;
      
      torun_threads.sort(CompareRunlevels());

      for(  runlevel_iter = torun_threads.begin(); 
            runlevel_iter != torun_threads.end(); 
            runlevel_iter++) {

            if(runlevel_idx < (*runlevel_iter).runlevel) {
                  runlevel_idx = (*runlevel_iter).runlevel;
                  current_runlevel.clear();
                  //push_back an empty list in which we store all scripts of the 
                  //current runlevel...
                  torun_scripts.push_back(current_runlevel);
            }

            torun_scripts.back().push_back(*runlevel_iter);
      }

      return SCRIPT_ENGINE_SUCCESS;
}

/* Because we can't iterate over all ports of interest in one go
 * we need to do port matching in a separate function (unlike host
 * rule matching)
 * Note that we assume that at -1 on the stack we can find the portrules
 * */
int process_pickScriptsForPort(lua_State* L, Target* target, Port* port, std::list<thread_record>& torun_threads) {
    lua_pushnil(L);
    while (lua_next(L, -2) != 0)
    {
      // Portrule function & file closure on stack
      lua_pushvalue(L, -2); // portrule function (key)
      lua_newtable(L);
      set_hostinfo(L, target); // portrule argument 1
      lua_newtable(L);
      set_portinfo(L, port); // portrule argument 2
      SCRIPT_ENGINE_LUA_TRY(lua_pcall(L, 2, 1, 0));

      if (lua_isboolean(L, -1) && lua_toboolean(L, -1))
      {
          struct thread_record tr;
        tr.rr.type = 1;
        tr.rr.port = port;
        tr.rr.host = target;

        SCRIPT_ENGINE_TRY(process_preparethread(L, &tr));

        torun_threads.push_back(tr);
        
        SCRIPT_ENGINE_DEBUGGING(
            lua_getfenv(L, -2); // file closure environment
            lua_getfield(L, -1, FILENAME);
            log_write(LOG_STDOUT, "%s: Will run %s against %s\n",
              SCRIPT_ENGINE,
              lua_tostring(L, -1),
              target->targetipstr());
            lua_pop(L, 2);
            )
      }
      lua_pop(L, 2); // boolean and file closure
    }
      return SCRIPT_ENGINE_SUCCESS;
}

/* Create a new lua thread and prepare it for execution
 * we store target info in the thread so that the mainloop
 * knows where to put the script result. File closure is expected
 * at stack index -2.
 * */
int process_preparethread(lua_State* L, struct thread_record *tr){

      lua_State *thread = lua_newthread(L);
      tr->registry_idx = luaL_ref(L, LUA_REGISTRYINDEX); // store thread
    tr->thread = thread;

    lua_pushvalue(L, -2); // File closure
    lua_getfenv(L, -1); // get script file environment
    lua_getfield(L, -1, FILENAME); // get its filename
 
    lua_createtable(L, 0, 11); // new environment
    lua_pushvalue(L, -2); // script filename
    lua_setfield(L, -2, FILENAME);
    lua_pushnumber(L, 1.0); // set a default RUNLEVEL
    lua_setfield(L, -2, RUNLEVEL);
    lua_createtable(L, 0, 1); // metatable for env
    lua_pushvalue(L, LUA_GLOBALSINDEX);
    lua_setfield(L, -2, "__index"); // global access
    lua_setmetatable(L, -2);

    lua_pushvalue(L, -4); // script file closure
    lua_pushvalue(L, -2); // script env
    lua_setfenv(L, -2);
    SCRIPT_ENGINE_LUA_TRY(
        lua_pcall(L, 0, 0, 0) // file closure loads globals (action, id, etc.)
        );

      lua_getfield(L, -1, RUNLEVEL);
      tr->runlevel = lua_tonumber(L, -1);
      lua_pop(L, 1);

      // move the script action closure into the thread
    lua_getfield(L, -1, ACTION); // action closure
      lua_xmove(L, thread, 2); 
    lua_pop(L, 1); // filename
    lua_setfenv(L, -2); // reset old env
    lua_pop(L, 1); // file closure

      // make the info table
      lua_newtable(thread); 
      set_hostinfo(thread, tr->rr.host);

      /* if this is a host rule we don't have
       * a port state
       * */
      if(tr->rr.port != NULL) {
            lua_newtable(thread);
            set_portinfo(thread, tr->rr.port);
            tr->resume_arguments = 2;
      }
    else
        tr->resume_arguments = 1;

      return SCRIPT_ENGINE_SUCCESS;
}

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