mirror of
https://github.com/falcosecurity/falco.git
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6445cdb950
* Use correct copyright years. Also include the start year. * Improve copyright notices. Use the proper start year instead of just 2018. Add the right owner Draios dba Sysdig. Add copyright notices to some files that were missing them.
124 lines
2.7 KiB
C++
124 lines
2.7 KiB
C++
/*
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Copyright (C) 2016-2018 Draios Inc dba Sysdig.
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This file is part of falco.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include <fstream>
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#include "config_falco_engine.h"
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#include "falco_common.h"
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std::vector<std::string> falco_common::priority_names = {
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"Emergency",
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"Alert",
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"Critical",
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"Error",
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"Warning",
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"Notice",
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"Informational",
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"Debug"};
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falco_common::falco_common()
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{
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m_ls = lua_open();
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if(!m_ls)
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{
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throw falco_exception("Cannot open lua");
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}
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luaL_openlibs(m_ls);
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}
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falco_common::~falco_common()
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{
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if(m_ls)
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{
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lua_close(m_ls);
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}
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}
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void falco_common::set_inspector(sinsp *inspector)
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{
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m_inspector = inspector;
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}
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void falco_common::init(const char *lua_main_filename, const char *source_dir)
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{
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ifstream is;
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string lua_dir = FALCO_ENGINE_LUA_DIR;
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string lua_main_path = lua_dir + lua_main_filename;
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is.open(lua_main_path);
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if (!is.is_open())
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{
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lua_dir = source_dir;
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lua_main_path = lua_dir + lua_main_filename;
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is.open(lua_main_path);
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if (!is.is_open())
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{
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throw falco_exception("Could not find Falco Lua entrypoint (tried " +
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string(FALCO_ENGINE_LUA_DIR) + lua_main_filename + ", " +
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string(source_dir) + lua_main_filename + ")");
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}
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}
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// Initialize Lua interpreter
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add_lua_path(lua_dir);
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// Load the main program, which defines all the available functions.
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string scriptstr((istreambuf_iterator<char>(is)),
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istreambuf_iterator<char>());
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if(luaL_loadstring(m_ls, scriptstr.c_str()) || lua_pcall(m_ls, 0, 0, 0))
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{
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throw falco_exception("Failed to load script " +
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lua_main_path + ": " + lua_tostring(m_ls, -1));
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}
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}
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void falco_common::add_lua_path(string &path)
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{
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string cpath = string(path);
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path += "?.lua";
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cpath += "?.so";
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lua_getglobal(m_ls, "package");
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lua_getfield(m_ls, -1, "path");
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string cur_path = lua_tostring(m_ls, -1 );
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cur_path += ';';
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lua_pop(m_ls, 1);
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cur_path.append(path.c_str());
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lua_pushstring(m_ls, cur_path.c_str());
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lua_setfield(m_ls, -2, "path");
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lua_getfield(m_ls, -1, "cpath");
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string cur_cpath = lua_tostring(m_ls, -1 );
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cur_cpath += ';';
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lua_pop(m_ls, 1);
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cur_cpath.append(cpath.c_str());
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lua_pushstring(m_ls, cur_cpath.c_str());
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lua_setfield(m_ls, -2, "cpath");
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lua_pop(m_ls, 1);
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}
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