lua/lua.c

   1 /* Lua bindings for Newserv */
   2
   3 /* Copyright (C) Chris Porter 2005 */
   4 /* ALL RIGHTS RESERVED. */
   5 /* Don't put this into the SVN repo. */
   6
   7 #include "../core/config.h"
   8 #include "../core/error.h"
   9 #include "../core/hooks.h"
  10 #include "../lib/array.h"
  11 #include "../lib/irc_string.h"
  12 #include "../core/schedule.h"
  13 #include "../lib/version.h"
  14
  15 #include "lua.h"
  16
  17 MODULE_VERSION(LUA_FULLVERSION);
  18
  19 #ifdef LUA_DEBUGSOCKET
  20
  21 #include <sys/types.h>
  22 #include <sys/socket.h>
  23 #include <netinet/in.h>
  24 #include <arpa/inet.h>
  25 #include <netdb.h>
  26 #include <unistd.h>
  27 #include <stdarg.h>
  28
  29 #endif
  30
  31 void lua_startup(void *arg);
  32 void lua_loadscripts(void);
  33 void lua_registercommands(lua_State *l);
  34 void lua_registerdbcommands(lua_State *l);
  35 void lua_initnickpusher(void);
  36 void lua_initchanpusher(void);
  37 void lua_loadlibs(lua_State *l);
  38 void lua_require(lua_State *l, char *module);
  39
  40 void lua_startbot(void *arg);
  41 void lua_destroybot(void);
  42 void lua_startcontrol(void);
  43 void lua_destroycontrol(void);
  44
  45 void lua_onunload(lua_State *l);
  46 void lua_onload(lua_State *l);
  47
  48 void lua_setpath(lua_State *l);
  49
  50 void lua_setupdebugsocket(void);
  51 void lua_freedebugsocket(void);
  52
  53 void lua_deregisternicks(lua_list *l);
  54 void lua_registerlocalcommands(lua_State *ps);
  55 void lua_registerdebug(lua_State *ps);
  56 void lua_socket_closeall(lua_list *l);
  57 void lua_registersocketcommands(lua_State *ps);
  58 void lua_registercryptocommands(lua_State *ps);
  59
  60 #ifdef LUA_DEBUGSOCKET
  61
  62 struct sockaddr_in debugsocketdest;
  63 int debugsocket = -1;
  64
  65 #endif
  66
  67 lua_list *lua_head = NULL, *lua_tail = NULL;
  68
  69 sstring *cpath = NULL, *suffix = NULL;
  70
  71 void *startsched = NULL;
  72
  73 int loaded = 0;
  74
  75 struct rusage r_usages;
  76 struct rusage r_usagee;
  77
  78 static const luaL_Reg ourlibs[] = {
  79   {"", luaopen_base},
  80   {LUA_LOADLIBNAME, luaopen_package},
  81   {LUA_TABLIBNAME, luaopen_table},
  82   {LUA_IOLIBNAME, luaopen_io},
  83   {LUA_OSLIBNAME, luaopen_os},
  84   {LUA_STRLIBNAME, luaopen_string},
  85   {LUA_MATHLIBNAME, luaopen_math},
  86 #ifdef LUA_USEJIT
  87   {LUA_JITLIBNAME, luaopen_jit},
  88 #endif
  89   {NULL, NULL}
  90 };
  91
  92 lua_list dummy;
  93
  94 void _init() {
  95   lua_setupdebugsocket();
  96   lua_initnickpusher();
  97   lua_initchanpusher();
  98
  99   dummy.name = getsstring("???", 10);
 100   if(!dummy.name) {
 101     Error("lua", ERR_ERROR, "Cannot set dummy name.");
 102     return;
 103   }
 104
 105   cpath = getcopyconfigitem("lua", "scriptdir", "", 500);
 106
 107   if(!cpath || !cpath->content || !cpath->content[0]) {
 108     Error("lua", ERR_ERROR, "Error loading path.");
 109     return;
 110   }
 111
 112   suffix = getcopyconfigitem("lua", "scriptsuffix", ".lua", 10);
 113   if(!suffix) {
 114     Error("lua", ERR_ERROR, "Error loading suffix.");
 115     return;
 116   }
 117
 118   loaded = 1;
 119
 120   startsched = scheduleoneshot(time(NULL) + 1, &lua_startup, NULL);
 121 }
 122
 123 void lua_startup(void *arg) {
 124   startsched = NULL;
 125
 126   lua_startcontrol();
 127   lua_startbot(NULL);
 128
 129   lua_loadscripts();
 130 }
 131
 132 #ifdef BROKEN_DLCLOSE
 133 void __fini() {
 134 #else
 135 void _fini() {
 136 #endif
 137
 138   if(loaded) {
 139     if(startsched)
 140       deleteschedule(startsched, &lua_startup, NULL);
 141
 142     while(lua_head)
 143       lua_unloadscript(lua_head);
 144
 145     lua_destroybot();
 146     lua_destroycontrol();
 147   }
 148
 149   freesstring(cpath);
 150   freesstring(suffix);
 151   freesstring(dummy.name);
 152
 153   lua_freedebugsocket();
 154 }
 155
 156 void lua_loadscripts(void) {
 157   array *ls;
 158
 159   ls = getconfigitems("lua", "script");
 160   if(!ls) {
 161     Error("lua", ERR_INFO, "No scripts loaded.");
 162   } else {
 163     sstring **scripts = (sstring **)(ls->content);
 164     int i;
 165     for(i=0;i<ls->cursi;i++)
 166       lua_loadscript(scripts[i]->content);
 167   }
 168 }
 169
 170 /* taken from the lua manual, modified to use nsmalloc */
 171 static void *lua_nsmalloc(void *ud, void *ptr, size_t osize, size_t nsize) {
 172   if(nsize == 0) {
 173     if(ptr != NULL)
 174       luafree(ptr);
 175     return NULL;
 176   }
 177
 178   return luarealloc(ptr, nsize);
 179 }
 180
 181 lua_State *lua_loadscript(char *file) {
 182   char fullpath[LUA_PATHLEN];
 183   int top;
 184   lua_State *l;
 185   lua_list *n;
 186
 187   if(!cpath || !suffix)
 188     return NULL;
 189
 190   delchars(file, "./\\;");
 191
 192   if(lua_scriptloaded(file))
 193     return NULL;
 194
 195   l = lua_newstate(lua_nsmalloc, NULL);
 196   if(!l)
 197     return NULL;
 198
 199   n = (lua_list *)luamalloc(sizeof(lua_list));;
 200   if(!n) {
 201     Error("lua", ERR_ERROR, "Error allocing list for %s.", file);
 202     return NULL;
 203   }
 204
 205   n->name = getsstring(file, LUA_PATHLEN);
 206   if(!n->name) {
 207     Error("lua", ERR_ERROR, "Error allocing name item for %s.", file);
 208     luafree(n);
 209     return NULL;
 210   }
 211   n->calls = 0;
 212
 213   timerclear(&n->ru_utime);
 214   timerclear(&n->ru_stime);
 215
 216   lua_loadlibs(l);
 217   lua_registerdebug(l);
 218   lua_registercommands(l);
 219   lua_registerlocalcommands(l);
 220   lua_registerdbcommands(l);
 221   lua_registersocketcommands(l);
 222   lua_registercryptocommands(l);
 223
 224   lua_setpath(l);
 225
 226 #ifdef LUA_USEJIT
 227   lua_require(l, "lib/jit");
 228 #endif
 229
 230   lua_require(l, "lib/bootstrap");
 231
 232   snprintf(fullpath, sizeof(fullpath), "%s/%s%s", cpath->content, file, suffix->content);
 233   if(luaL_loadfile(l, fullpath)) {
 234     Error("lua", ERR_ERROR, "Error loading %s.", file);
 235     lua_close(l);
 236     freesstring(n->name);
 237     luafree(n);
 238     return NULL;
 239   }
 240
 241   n->l = l;
 242
 243   n->next = NULL;
 244   n->prev = lua_tail;
 245   n->nicks = NULL;
 246   n->sockets = NULL;
 247
 248   if(!lua_head) {
 249     lua_head = n;
 250   } else {
 251     lua_tail->next = n;
 252   }
 253
 254   lua_tail = n;
 255
 256   top = lua_gettop(l);
 257
 258   if(lua_pcall(l, 0, 0, 0)) {
 259     Error("lua", ERR_ERROR, "Error pcalling: %s.", file);
 260     lua_close(l);
 261     freesstring(n->name);
 262     luafree(n);
 263     return NULL;
 264   }
 265
 266   lua_settop(l, top);
 267
 268   Error("lua", ERR_INFO, "Loaded %s.", file);
 269   lua_onload(l);
 270
 271   return l;
 272 }
 273
 274 void lua_unloadscript(lua_list *l) {
 275   lua_onunload(l->l);
 276   lua_deregisternicks(l);
 277   lua_socket_closeall(l);
 278   lua_close(l->l);
 279   freesstring(l->name);
 280
 281   /* well, at least it's O(1) */
 282
 283   if(!l->prev) { /* head */
 284     lua_head = l->next;
 285     if(!lua_head) {
 286       lua_tail = NULL;
 287     } else {
 288       lua_head->prev = NULL;
 289     }
 290   } else {
 291     if(!l->next) { /* tail */
 292       lua_tail = lua_tail->prev;
 293       if(!lua_tail) {
 294         lua_head = NULL;
 295       } else {
 296         lua_tail->next = NULL;
 297       }
 298     } else {
 299       l->prev->next = l->next;
 300       l->next->prev = l->prev;
 301      }
 302   }
 303
 304   luafree(l);
 305 }
 306
 307 void lua_setpath(lua_State *l) {
 308   char fullpath[LUA_PATHLEN], *prev = NULL;
 309
 310   int top = lua_gettop(l);
 311
 312   lua_getglobal(l, "package");
 313   if(!lua_istable(l, 1)) {
 314     Error("lua", ERR_ERROR, "Unable to set package.path (package is not a table).");
 315     return;
 316   }
 317
 318   lua_pushstring(l, "path");
 319   lua_gettable(l, -2);
 320
 321   if(lua_isstring(l, -1))
 322     prev = (char *)lua_tostring(l, -1);
 323
 324   if(prev) {
 325     snprintf(fullpath, sizeof(fullpath), "%s;%s/?%s", prev, cpath->content, suffix->content);
 326   } else {
 327     snprintf(fullpath, sizeof(fullpath), "%s/?%s", cpath->content, suffix->content);
 328   }
 329
 330   /* pop broke! */
 331
 332   lua_getglobal(l, "package");
 333   if(!lua_istable(l, 1)) {
 334     Error("lua", ERR_ERROR, "Unable to set package.path (package is not a table).");
 335     return;
 336   }
 337
 338   lua_pushstring(l, "path");
 339
 340   lua_pushstring(l, fullpath);
 341   lua_settable(l, -3);
 342
 343   lua_settop(l, top);
 344 }
 345
 346 lua_list *lua_scriptloaded(char *name) {
 347   lua_list *l;
 348
 349   for(l=lua_head;l;l=l->next)
 350     if(!strcmp(l->name->content, name))
 351       return l;
 352
 353   return NULL;
 354 }
 355
 356 void lua_loadlibs(lua_State *l) {
 357   const luaL_Reg *lib = ourlibs;
 358
 359   for (;lib->func;lib++) {
 360     lua_pushcfunction(l, lib->func);
 361     lua_pushstring(l, lib->name);
 362     lua_call(l, 1, 0);
 363   }
 364 }
 365
 366 void lua_require(lua_State *l, char *module) {
 367   int top = lua_gettop(l);
 368
 369   lua_getglobal(l, "require");
 370   lua_pushstring(l, module);
 371
 372   if(lua_pcall(l, 1, 1, 0))
 373     Error("lua", ERR_ERROR, "Error requiring %s: %s", module, lua_tostring(l, -1));
 374
 375   lua_settop(l, top);
 376 }
 377
 378 void lua_setupdebugsocket(void) {
 379 #ifdef LUA_DEBUGSOCKET
 380
 381   debugsocket = socket(AF_INET, SOCK_DGRAM, 0);
 382   if(debugsocket < 0) {
 383     debugsocket = -1;
 384     Error("lua", ERR_ERROR, "Cannot create debug socket.");
 385
 386     return;
 387   }
 388
 389   memset(&debugsocketdest, 0, sizeof(debugsocketdest));
 390
 391   debugsocketdest.sin_family = AF_INET;
 392   debugsocketdest.sin_port = htons(LUA_DEBUGSOCKET_PORT);
 393   debugsocketdest.sin_addr.s_addr = inet_addr(LUA_DEBUGSOCKET_ADDRESS);
 394
 395 #endif
 396 }
 397
 398 void lua_freedebugsocket(void) {
 399 #ifdef LUA_DEBUGSOCKET
 400
 401   if(debugsocket == -1)
 402     return;
 403
 404   close(debugsocket);
 405
 406
 407   debugsocket = -1;
 408
 409 #endif
 410 }
 411
 412 #ifdef LUA_DEBUGSOCKET
 413 void lua_debugoutput(char *format, ...) {
 414   char buf[1024];
 415   va_list va;
 416   int size;
 417
 418   if(debugsocket == -1)
 419     return;
 420
 421   va_start(va, format);
 422   size = vsnprintf(buf, sizeof(buf), format, va);
 423   va_end(va);
 424
 425   if(size >= sizeof(buf))
 426     size = sizeof(buf) - 1;
 427
 428   if(size > 0)
 429     sendto(debugsocket, buf, size, 0, (struct sockaddr *)&debugsocketdest, sizeof(debugsocketdest));
 430 }
 431 #endif
 432
 433 lua_list *lua_listfromstate(lua_State *l) {
 434   lua_list *i = lua_head;
 435   for(;i;i=i->next)
 436     if(i->l == l)
 437       return i;
 438
 439   return &dummy;
 440 }
 441
 442 int lua_listexists(lua_list *l) {
 443   lua_list *i;
 444
 445   for(i=lua_head;i;i=i->next)
 446     if(i == l)
 447       return 1;
 448
 449   return 0;
 450 }
 451
 452 int lua_lineok(const char *data) {
 453   if(strchr(data, '\r') || strchr(data, '\n'))
 454     return 0;
 455   return 1;
 456 }
 457
 458 INLINE int lua_debugpcall(lua_State *l, char *message, int a, int b, int c) {
 459   lua_list *l2 = lua_listfromstate(l);
 460   int ret;
 461
 462 #ifdef LUA_DEBUGSOCKET
 463   DEBUGOUT("%s: %s\n", l2->name->content, message);
 464 #endif
 465
 466 #ifdef LUA_PROFILE
 467   ACCOUNTING_START(l2);
 468 #endif
 469
 470   ret = lua_pcall(l, a, b, c);
 471
 472 #ifdef LUA_PROFILE
 473   ACCOUNTING_STOP(l2);
 474 #endif
 475
 476   return ret;
 477 }
 478