// Initializes a lua chisel
bool sinsp_chisel::init_lua_chisel(chisel_desc &cd, string const &fpath)
{
lua_State* ls = lua_open();
luaL_openlibs(ls);
//
// Load our own lua libs
//
luaL_openlib(ls, "sysdig", ll_sysdig, 0);
luaL_openlib(ls, "chisel", ll_chisel, 0);
luaL_openlib(ls, "evt", ll_evt, 0);
//
// Add our chisel paths to package.path
//
for(vector<chiseldir_info>::const_iterator it = g_chisel_dirs->begin();
it != g_chisel_dirs->end(); ++it)
{
string path(it->m_dir);
path += "?.lua";
add_lua_package_path(ls, path.c_str());
}
//
// Load the script
//
if(luaL_loadfile(ls, fpath.c_str()) || lua_pcall(ls, 0, 0, 0))
{
goto failure;
}
//
// Extract the description
//
lua_getglobal(ls, "description");
if(!lua_isstring(ls, -1))
{
goto failure;
}
cd.m_description = lua_tostring(ls, -1);
//
// Extract the short description
//
lua_getglobal(ls, "short_description");
if(!lua_isstring(ls, -1))
{
goto failure;
}
cd.m_shortdesc = lua_tostring(ls, -1);
//
// Extract the category
//
cd.m_category = "";
lua_getglobal(ls, "category");
if(lua_isstring(ls, -1))
{
cd.m_category = lua_tostring(ls, -1);
}
//
// Extract the hidden flag and skip the chisel if it's set
//
lua_getglobal(ls, "hidden");
if(lua_isboolean(ls, -1))
{
int sares = lua_toboolean(ls, -1);
if(sares)
{
goto failure;
}
}
//
// Extract the args
//
lua_getglobal(ls, "args");
try
{
parse_lua_chisel_args(ls, &cd);
}
catch(...)
{
goto failure;
}
return true;
failure:
lua_close(ls);
return false;
}
void sinsp_chisel::load(string cmdstr)
{
m_filename = cmdstr;
trim(cmdstr);
ifstream is;
//
// Try to open the file as is
//
if(!openfile(m_filename, &is))
{
//
// Try to add the .sc extension
//
if(!openfile(m_filename + ".sc", &is))
{
if(!openfile(m_filename + ".lua", &is))
{
throw sinsp_exception("can't open file " + m_filename);
}
}
}
//
// Bring the file into a string
//
string docstr((istreambuf_iterator<char>(is)),
istreambuf_iterator<char>());
#ifdef HAS_LUA_CHISELS
//
// Rewind the stream
//
is.seekg(0);
//
// Load the file
//
std::istreambuf_iterator<char> eos;
std::string scriptstr(std::istreambuf_iterator<char>(is), eos);
//
// Open the script
//
m_ls = lua_open();
luaL_openlibs(m_ls);
//
// Load our own lua libs
//
luaL_openlib(m_ls, "sysdig", ll_sysdig, 0);
luaL_openlib(m_ls, "chisel", ll_chisel, 0);
luaL_openlib(m_ls, "evt", ll_evt, 0);
//
// Add our chisel paths to package.path
//
for(uint32_t j = 0; j < g_chisel_dirs->size(); j++)
{
string path(g_chisel_dirs->at(j).m_dir);
path += "?.lua";
add_lua_package_path(m_ls, path.c_str());
}
//
// Load the script
//
if(luaL_loadstring(m_ls, scriptstr.c_str()) || lua_pcall(m_ls, 0, 0, 0))
{
throw sinsp_exception("Failed to load chisel " +
m_filename + ": " + lua_tostring(m_ls, -1));
}
//
// Allocate the chisel context for the script
//
m_lua_cinfo = new chiselinfo(m_inspector);
//
// Set the context globals
//
lua_pushlightuserdata(m_ls, this);
lua_setglobal(m_ls, "sichisel");
//
// Extract the args
//
lua_getglobal(m_ls, "args");
if(!lua_istable(m_ls, -1))
{
throw sinsp_exception("Failed to load chisel " +
m_filename + ": args table missing");
}
try
{
parse_lua_chisel_args(m_ls, &m_lua_script_info);
}
catch(sinsp_exception& e)
{
throw e;
}
//
// Check if the script has an on_event
//
lua_getglobal(m_ls, "on_event");
if(lua_isfunction(m_ls, -1))
{
m_lua_has_handle_evt = true;
lua_pop(m_ls, 1);
}
#endif
is.close();
}
//
// 1. Iterates through the chisel files on disk (.sc and .lua)
// 2. Opens them and extracts the fields (name, description, etc)
// 3. Adds them to the chisel_descs vector.
//
void sinsp_chisel::get_chisel_list(vector<chisel_desc>* chisel_descs)
{
uint32_t j;
for(j = 0; j < g_chisel_dirs->size(); j++)
{
if(string(g_chisel_dirs->at(j).m_dir) == "")
{
continue;
}
tinydir_dir dir;
tinydir_open(&dir, g_chisel_dirs->at(j).m_dir);
while(dir.has_next)
{
tinydir_file file;
tinydir_readfile(&dir, &file);
string fname(file.name);
string fpath(file.path);
if(fname.find(".sc") == fname.size() - 3)
{
try
{
sinsp_chisel ch(NULL, fpath);
chisel_desc cd;
cd.m_name = fname.substr(0, fname.rfind('.'));
cd.m_description = ch.m_description;
const Json::Value args = (*ch.m_root)["info"]["arguments"];
for(uint32_t k = 0; k < args.size(); k++)
{
cd.m_args.push_back(chiselarg_desc(
args[k]["name"].asString(),
args[k]["type"].asString(),
args[k]["description"].asString()
));
}
chisel_descs->push_back(cd);
}
catch(...)
{
//
// If there was an error opening the chisel, skip to the next one
//
goto next_file;
}
}
#ifdef HAS_LUA_CHISELS
if(fname.find(".lua") == fname.size() - 4)
{
chisel_desc cd;
cd.m_name = fname.substr(0, fname.rfind('.'));
lua_State* ls = lua_open();
luaL_openlibs(ls);
//
// Load our own lua libs
//
luaL_openlib(ls, "sysdig", ll_sysdig, 0);
luaL_openlib(ls, "chisel", ll_chisel, 0);
luaL_openlib(ls, "evt", ll_evt, 0);
//
// Add our chisel paths to package.path
//
for(uint32_t k = 0; k < g_chisel_dirs->size(); k++)
{
string path(g_chisel_dirs->at(k).m_dir);
path += "?.lua";
add_lua_package_path(ls, path.c_str());
}
//
// Load the script
//
if(luaL_loadfile(ls, fpath.c_str()) || lua_pcall(ls, 0, 0, 0))
{
goto next_lua_file;
}
//
// Extract the description
//
lua_getglobal(ls, "description");
if(!lua_isstring(ls, -1))
{
goto next_lua_file;
}
cd.m_description = lua_tostring(ls, -1);
//
// Extract the short description
//
lua_getglobal(ls, "short_description");
if(!lua_isstring(ls, -1))
{
goto next_lua_file;
}
cd.m_shortdesc = lua_tostring(ls, -1);
//
// Extract the category
//
cd.m_category = "";
lua_getglobal(ls, "category");
if(lua_isstring(ls, -1))
{
cd.m_category = lua_tostring(ls, -1);
}
//
// Extract the hidden flag and skip the chisel if it's set
//
lua_getglobal(ls, "hidden");
if(lua_isboolean(ls, -1))
{
int sares = lua_toboolean(ls, -1);
if(sares)
{
goto next_lua_file;
}
}
//
// Extract the args
//
lua_getglobal(ls, "args");
try
{
parse_lua_chisel_args(ls, &cd);
}
catch(...)
{
goto next_lua_file;
}
chisel_descs->push_back(cd);
next_lua_file:
lua_close(ls);
}
#endif
next_file:
tinydir_next(&dir);
}
tinydir_close(&dir);
}
}