added luaclient

1 files changed, 256 insertions, 0 deletions

diff --git a/luaclient.c b/luaclient.c
new file mode 100644
index 0000000..f77dbe0
--- /dev/null
+++ b/luaclient.c
@@ -0,0 +1,256 @@
+/*
+ *  rhctl
+ *
+ *  Copyright (C) 2009 Christian Pointner <equinox@spreadspace.org>
+ *
+ *  This file is part of rhctl.
+ *
+ *  rhctl is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  any later version.
+ *
+ *  rhctl is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with rhctl. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "datatypes.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <lua.h>
+#include <lualib.h>
+#include <lauxlib.h>
+
+#include "l_log.h"
+#include "l_sig_handler.h"
+
+#include "log.h"
+#include "options.h"
+
+#include "daemon.h"
+#include "utils.h"
+
+int process_cmd(const char* cmd, int fd, cmd_t **cmd_q, client_t* client_lst, options_t* opt)
+{
+  return 0;
+}
+
+#define LUA_MAIN_LOOP_FUNC "main_loop"
+
+static const luaL_Reg anylike_lualibs[] = {
+  {"", luaopen_base},
+  {LUA_LOADLIBNAME, luaopen_package},  
+  {LUA_TABLIBNAME, luaopen_table},
+  {LUA_STRLIBNAME, luaopen_string},
+  {LUA_MATHLIBNAME, luaopen_math},
+  {LUA_SIGNALLIBNAME, luaopen_signal},
+  {LUA_LOGLIBNAME, luaopen_log},
+  {NULL, NULL}
+};
+
+int init_main_loop(lua_State *L, const char* filename)
+{
+  const luaL_Reg *lib = anylike_lualibs;
+  for (; lib->func; lib++) {
+    lua_pushcfunction(L, lib->func);
+    lua_pushstring(L, lib->name);
+    lua_call(L, 1, 0);
+  }
+
+  int ret = luaL_loadfile(L, filename);
+  if(ret) {
+    const char* err_str = luaL_checkstring(L, -1);
+    switch(ret) {
+    case LUA_ERRSYNTAX: log_printf(ERROR, "luaL_loadfile(%s) syntax error: %s", filename, err_str); break;
+    case LUA_ERRMEM: log_printf(ERROR, "luaL_loadfile(%s) malloc error: %s", filename, err_str); break;
+    case LUA_ERRFILE: log_printf(ERROR, "luaL_loadfile(%s) file access error: %s", filename, err_str); break;
+    default: log_printf(ERROR, "luaL_loadfile(%s) unknown error: %s", filename, err_str); break;
+    }
+    return -1;
+  }
+
+  ret = lua_pcall(L, 0, 0, 0);
+  if(ret) {
+    const char* err_str = luaL_checkstring(L, -1);
+    switch(ret) {
+    case LUA_ERRRUN: log_printf(ERROR, "lua_pcall() runtime error: %s", err_str); break;
+    case LUA_ERRMEM: log_printf(ERROR, "lua_pcall() malloc error: %s", err_str); break;
+    case LUA_ERRERR: log_printf(ERROR, "lua_pcall() error at error handler function: %s", err_str); break;
+    }
+    return -1;
+  }
+
+  return 0;
+}
+
+int call_main_loop(lua_State* L, int cmd_fd, options_t* opt)
+{
+  lua_getglobal(L, LUA_MAIN_LOOP_FUNC);
+  if(!lua_isfunction(L, -1)) {
+    log_printf(ERROR, "there is no function '%s' inside the load file", LUA_MAIN_LOOP_FUNC);
+    return -1;
+  };
+
+  options_lua_push(opt, L);
+
+  int ret = lua_pcall(L, 1, LUA_MULTRET, 0);
+  if(ret) {
+    const char* err_str = luaL_checkstring(L, -1);
+    switch(ret) {
+    case LUA_ERRRUN: log_printf(ERROR, "lua_pcall(%s) runtime error: %s", LUA_MAIN_LOOP_FUNC, err_str); break;
+    case LUA_ERRMEM: log_printf(ERROR, "lua_pcall(%s) malloc error: %s", LUA_MAIN_LOOP_FUNC, err_str); break;
+    case LUA_ERRERR: log_printf(ERROR, "lua_pcall(%s) error at error handler function: %s", LUA_MAIN_LOOP_FUNC, err_str); break;
+    }
+    return -1;
+  }
+
+  int n = lua_gettop(L);
+  log_printf(DEBUG, "%s returned %d values", LUA_MAIN_LOOP_FUNC, n);
+  int i;
+  for (i = 1; i <= n; i++)
+    log_printf(DEBUG, "return value [%d] = '%s'", i, luaL_checkstring(L, i));
+
+  ret = lua_tointeger(L, 1);
+  return ret;
+}
+
+int main_loop(int cmd_fd, options_t* opt)
+{
+  lua_State *L;
+  L = luaL_newstate();
+  if(!L) {
+    log_printf(ERROR, "error creating lua state");
+    return -1;
+  }
+
+  int ret = init_main_loop(L, opt->lua_file_);
+  if(!ret)
+    ret = call_main_loop(L, cmd_fd, opt);
+  
+  lua_close(L);
+  return ret;
+}
+
+int main(int argc, char* argv[])
+{
+  log_init();
+
+  options_t opt;
+  int ret = options_parse(&opt, argc, argv);
+  if(ret) {
+    if(ret > 0) {
+      fprintf(stderr, "syntax error near: %s\n\n", argv[ret]);
+    }
+    if(ret == -2) {
+      fprintf(stderr, "memory error on options_parse, exiting\n");
+    }
+
+    if(ret != -2)
+      options_print_usage();
+
+    options_clear(&opt);
+    log_close();
+    exit(ret);
+  }
+  string_list_element_t* tmp = opt.log_targets_.first_;
+  if(!tmp) {
+    log_add_target("syslog:3,luaclient,daemon");
+  }
+  else {
+    while(tmp) {
+      ret = log_add_target(tmp->string_);
+      if(ret) {
+        switch(ret) {
+        case -2: fprintf(stderr, "memory error on log_add_target, exitting\n"); break;
+        case -3: fprintf(stderr, "unknown log target: '%s', exitting\n", tmp->string_); break;
+        case -4: fprintf(stderr, "this log target is only allowed once: '%s', exitting\n", tmp->string_); break;
+        default: fprintf(stderr, "syntax error near: '%s', exitting\n", tmp->string_); break;
+        }
+        
+        options_clear(&opt);
+        log_close();
+        exit(ret);
+      }
+      tmp = tmp->next_;
+    }
+  }
+  log_printf(NOTICE, "just started...");
+  if(options_parse_post(&opt)) {
+    options_clear(&opt);
+    log_close();
+    exit(-1);
+  }
+
+  priv_info_t priv;
+  if(opt.username_)
+    if(priv_init(&priv, opt.username_, opt.groupname_)) {
+      options_clear(&opt);
+      log_close();
+      exit(-1);
+    }
+
+  FILE* pid_file = NULL;
+  if(opt.pid_file_) {
+    pid_file = fopen(opt.pid_file_, "w");
+    if(!pid_file) {
+      log_printf(WARNING, "unable to open pid file: %s", strerror(errno));
+    }
+  }
+
+  if(opt.chroot_dir_)
+    if(do_chroot(opt.chroot_dir_)) {
+      options_clear(&opt);
+      log_close();
+      exit(-1);
+    }
+  if(opt.username_)
+    if(priv_drop(&priv)) {
+      options_clear(&opt);
+      log_close();
+      exit(-1);
+    }
+
+  if(opt.daemonize_) {
+    pid_t oldpid = getpid();
+    daemonize();
+    log_printf(INFO, "running in background now (old pid: %d)", oldpid);
+  }
+
+  if(pid_file) {
+    pid_t pid = getpid();
+    fprintf(pid_file, "%d", pid);
+    fclose(pid_file);
+  }
+
+  int cmd_fd = connect_command_socket(opt.command_sock_);
+  if(cmd_fd < 0) {
+    options_clear(&opt);
+    log_close();
+    exit(-1);
+  }
+
+  ret = main_loop(cmd_fd, &opt);
+
+  close(cmd_fd);
+
+  if(!ret)
+    log_printf(NOTICE, "normal shutdown");
+  else if(ret < 0)
+    log_printf(NOTICE, "shutdown after error");
+  else
+    log_printf(NOTICE, "shutdown after signal");
+
+  options_clear(&opt);
+  log_close();
+
+  return ret;
+}