mirror of
https://github.com/falcosecurity/falco.git
synced 2025-10-31 09:09:45 +00:00
f547dc97ab
Move the c++ and lua code implementing falco engine/falco common to its own directory userspace/engine. It's compiled as a static library libfalco_engine.a, and has its own CMakeLists.txt so it can be included by other projects. The engine's CMakeLists.txt has a add_subdirectory for the falco rules directory, so including the engine also builds the rules. The variables you need to set to use the engine's CMakeLists.txt are: - CMAKE_INSTALL_PREFIX: the root directory below which everything is installed. - FALCO_ETC_DIR: where to install the rules file. - FALCO_SHARE_DIR: where to install lua code, relative to the - install/package root. - LUAJIT_INCLUDE: where to find header files for lua. - FALCO_SINSP_LIBRARY: the library containing sinsp code. It will be - considered a dependency of the engine. - LPEG_LIB/LYAML_LIB/LIBYAML_LIB: locations for third-party libraries. - FALCO_COMPONENT: if set, will be included as a part of any install() commands. Instead of specifying /usr/share/falco in config_falco_*.h.in, use CMAKE_INSTALL_PREFIX and FALCO_SHARE_DIR. The lua code for the engine has also moved, so the two lua source directories (userspace/engine/lua and userspace/falco/lua) need to be available separately via falco_common, so make it an argument to falco_common::init. As a part of making it easy to include in another project, also clean up LPEG build/defs. Modify build-lpeg to add a PREFIX argument to allow for object files/libraries being in an alternate location, and when building lpeg, put object files in a build/ subdirectory.
91 lines
1.9 KiB
C++
91 lines
1.9 KiB
C++
#include <fstream>
|
|
|
|
#include "config_falco_engine.h"
|
|
#include "falco_common.h"
|
|
|
|
falco_common::falco_common()
|
|
{
|
|
m_ls = lua_open();
|
|
luaL_openlibs(m_ls);
|
|
}
|
|
|
|
falco_common::~falco_common()
|
|
{
|
|
if(m_ls)
|
|
{
|
|
lua_close(m_ls);
|
|
}
|
|
}
|
|
|
|
void falco_common::set_inspector(sinsp *inspector)
|
|
{
|
|
m_inspector = inspector;
|
|
}
|
|
|
|
void falco_common::init(const char *lua_main_filename, const char *source_dir)
|
|
{
|
|
ifstream is;
|
|
string lua_dir = FALCO_ENGINE_LUA_DIR;
|
|
string lua_main_path = lua_dir + lua_main_filename;
|
|
|
|
is.open(lua_main_path);
|
|
if (!is.is_open())
|
|
{
|
|
lua_dir = source_dir;
|
|
lua_main_path = lua_dir + lua_main_filename;
|
|
|
|
is.open(lua_main_path);
|
|
if (!is.is_open())
|
|
{
|
|
throw falco_exception("Could not find Falco Lua entrypoint (tried " +
|
|
string(FALCO_ENGINE_LUA_DIR) + lua_main_filename + ", " +
|
|
string(source_dir) + lua_main_filename + ")");
|
|
}
|
|
}
|
|
|
|
// Initialize Lua interpreter
|
|
add_lua_path(lua_dir);
|
|
|
|
// Load the main program, which defines all the available functions.
|
|
string scriptstr((istreambuf_iterator<char>(is)),
|
|
istreambuf_iterator<char>());
|
|
|
|
if(luaL_loadstring(m_ls, scriptstr.c_str()) || lua_pcall(m_ls, 0, 0, 0))
|
|
{
|
|
throw falco_exception("Failed to load script " +
|
|
lua_main_path + ": " + lua_tostring(m_ls, -1));
|
|
}
|
|
}
|
|
|
|
void falco_common::add_lua_path(string &path)
|
|
{
|
|
string cpath = string(path);
|
|
path += "?.lua";
|
|
cpath += "?.so";
|
|
|
|
lua_getglobal(m_ls, "package");
|
|
|
|
lua_getfield(m_ls, -1, "path");
|
|
string cur_path = lua_tostring(m_ls, -1 );
|
|
cur_path += ';';
|
|
lua_pop(m_ls, 1);
|
|
|
|
cur_path.append(path.c_str());
|
|
|
|
lua_pushstring(m_ls, cur_path.c_str());
|
|
lua_setfield(m_ls, -2, "path");
|
|
|
|
lua_getfield(m_ls, -1, "cpath");
|
|
string cur_cpath = lua_tostring(m_ls, -1 );
|
|
cur_cpath += ';';
|
|
lua_pop(m_ls, 1);
|
|
|
|
cur_cpath.append(cpath.c_str());
|
|
|
|
lua_pushstring(m_ls, cur_cpath.c_str());
|
|
lua_setfield(m_ls, -2, "cpath");
|
|
|
|
lua_pop(m_ls, 1);
|
|
}
|
|
|