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 #define _POSIX_C_SOURCE 200112L
   8 #include <stdlib.h>
   9
  10 #include "../core/config.h"
  11 #include "../core/error.h"
  12 #include "../core/hooks.h"
  13 #include "../lib/array.h"
  14 #include "../lib/irc_string.h"
  15 #include "../core/schedule.h"
  16 #include "../lib/version.h"
  17 #include "../lib/strlfunc.h"
  18 #include "lua.h"
  19
  20 MODULE_VERSION(LUA_SMALLVERSION);
  21
  22 #ifdef LUA_DEBUGSOCKET
  23
  24 #include <sys/types.h>
  25 #include <sys/socket.h>
  26 #include <netinet/in.h>
  27 #include <arpa/inet.h>
  28 #include <netdb.h>
  29 #include <unistd.h>
  30 #include <stdarg.h>
  31
  32 #endif
  33
  34 void lua_startup(void *arg);
  35 void lua_loadscripts(void);
  36 void lua_registercommands(lua_State *l);
  37 void lua_registerdbcommands(lua_State *l);
  38 void lua_initnickpusher(void);
  39 void lua_initchanpusher(void);
  40 void lua_loadlibs(lua_State *l);
  41 void lua_require(lua_State *l, char *module);
  42
  43 void lua_startbot(void *arg);
  44 void lua_destroybot(void);
  45 void lua_startcontrol(void);
  46 void lua_destroycontrol(void);
  47
  48 void lua_onunload(lua_State *l);
  49 void lua_onload(lua_State *l);
  50
  51 void lua_setpath(void);
  52
  53 void lua_setupdebugsocket(void);
  54 void lua_freedebugsocket(void);
  55
  56 void lua_deregisternicks(lua_list *l);
  57 void lua_registerlocalcommands(lua_State *ps);
  58 void lua_registerdebug(lua_State *ps);
  59 void lua_socket_closeall(lua_list *l);
  60 void lua_scheduler_freeall(lua_list *l);
  61 void lua_registersocketcommands(lua_State *ps);
  62 void lua_registercryptocommands(lua_State *ps);
  63 void lua_registerschedulercommands(lua_State *ps);
  64
  65 #ifdef LUA_DEBUGSOCKET
  66
  67 struct sockaddr_in debugsocketdest;
  68 int debugsocket = -1;
  69
  70 #endif
  71
  72 lua_list *lua_head = NULL, *lua_tail = NULL;
  73
  74 sstring *cpath = NULL, *suffix = NULL;
  75
  76 void *startsched = NULL;
  77
  78 int loaded = 0;
  79
  80 struct rusage r_usages;
  81 struct rusage r_usagee;
  82
  83 static const luaL_Reg ourlibs[] = {
  84   {"", luaopen_base},
  85   {LUA_LOADLIBNAME, luaopen_package},
  86   {LUA_TABLIBNAME, luaopen_table},
  87   {LUA_IOLIBNAME, luaopen_io},
  88   {LUA_OSLIBNAME, luaopen_os},
  89   {LUA_STRLIBNAME, luaopen_string},
  90   {LUA_MATHLIBNAME, luaopen_math},
  91 #ifdef LUA_USEJIT
  92   {LUA_JITLIBNAME, luaopen_jit},
  93 #endif
  94   {NULL, NULL}
  95 };
  96
  97 lua_list dummy;
  98
  99 void _init() {
 100   lua_setupdebugsocket();
 101   lua_initnickpusher();
 102   lua_initchanpusher();
 103
 104   dummy.name = getsstring("???", 10);
 105   if(!dummy.name) {
 106     Error("lua", ERR_ERROR, "Cannot set dummy name.");
 107     return;
 108   }
 109
 110   cpath = getcopyconfigitem("lua", "scriptdir", "", 500);
 111
 112   if(!cpath || !cpath->content || !cpath->content[0]) {
 113     Error("lua", ERR_ERROR, "Error loading path.");
 114     return;
 115   }
 116
 117   suffix = getcopyconfigitem("lua", "scriptsuffix", ".lua", 10);
 118   if(!suffix) {
 119     Error("lua", ERR_ERROR, "Error loading suffix.");
 120     return;
 121   }
 122
 123   lua_setpath();
 124
 125   loaded = 1;
 126
 127   startsched = scheduleoneshot(time(NULL) + 1, &lua_startup, NULL);
 128 }
 129
 130 void lua_startup(void *arg) {
 131   startsched = NULL;
 132
 133   lua_startcontrol();
 134   lua_startbot(NULL);
 135
 136   lua_loadscripts();
 137 }
 138
 139 #ifdef BROKEN_DLCLOSE
 140 void __fini() {
 141 #else
 142 void _fini() {
 143 #endif
 144
 145   if(loaded) {
 146     if(startsched)
 147       deleteschedule(startsched, &lua_startup, NULL);
 148
 149     while(lua_head)
 150       lua_unloadscript(lua_head);
 151
 152     lua_destroybot();
 153     lua_destroycontrol();
 154   }
 155
 156   freesstring(cpath);
 157   freesstring(suffix);
 158   freesstring(dummy.name);
 159
 160   lua_freedebugsocket();
 161   nscheckfreeall(POOL_LUA);
 162 }
 163
 164 void lua_loadscripts(void) {
 165   array *ls;
 166
 167   ls = getconfigitems("lua", "script");
 168   if(!ls) {
 169     Error("lua", ERR_INFO, "No scripts loaded.");
 170   } else {
 171     sstring **scripts = (sstring **)(ls->content);
 172     int i;
 173     for(i=0;i<ls->cursi;i++)
 174       lua_loadscript(scripts[i]->content);
 175   }
 176 }
 177
 178 /* taken from the lua manual, modified to use nsmalloc */
 179 static void *lua_nsmalloc(void *ud, void *ptr, size_t osize, size_t nsize) {
 180   if(nsize == 0) {
 181     if(ptr != NULL)
 182       luafree(ptr);
 183     return NULL;
 184   }
 185
 186   return luarealloc(ptr, nsize);
 187 }
 188
 189 lua_State *lua_loadscript(char *file) {
 190   char fullpath[LUA_PATHLEN];
 191   int top;
 192   lua_State *l;
 193   lua_list *n;
 194   char buf[1024];
 195
 196   if(!cpath || !suffix)
 197     return NULL;
 198
 199   strlcpy(buf, file, sizeof(buf));
 200
 201   delchars(buf, "./\\;");
 202
 203   if(lua_scriptloaded(buf))
 204     return NULL;
 205
 206   l = lua_newstate(lua_nsmalloc, NULL);
 207   if(!l)
 208     return NULL;
 209
 210   n = (lua_list *)luamalloc(sizeof(lua_list));;
 211   if(!n) {
 212     Error("lua", ERR_ERROR, "Error allocing list for %s.", buf);
 213     return NULL;
 214   }
 215
 216   n->name = getsstring(buf, LUA_PATHLEN);
 217   if(!n->name) {
 218     Error("lua", ERR_ERROR, "Error allocing name item for %s.", buf);
 219     luafree(n);
 220     return NULL;
 221   }
 222   n->calls = 0;
 223
 224   timerclear(&n->ru_utime);
 225   timerclear(&n->ru_stime);
 226
 227   lua_loadlibs(l);
 228   lua_registerdebug(l);
 229   lua_registercommands(l);
 230   lua_registerlocalcommands(l);
 231   lua_registerdbcommands(l);
 232   lua_registersocketcommands(l);
 233   lua_registercryptocommands(l);
 234   lua_registerschedulercommands(l);
 235
 236 #ifdef LUA_USEJIT
 237   lua_require(l, "lib/jit");
 238 #endif
 239
 240   lua_require(l, "lib/bootstrap");
 241
 242   snprintf(fullpath, sizeof(fullpath), "%s/%s%s", cpath->content, file, suffix->content);
 243   if(luaL_loadfile(l, fullpath)) {
 244     Error("lua", ERR_ERROR, "Error loading %s.", file);
 245     lua_close(l);
 246     freesstring(n->name);
 247     luafree(n);
 248     return NULL;
 249   }
 250
 251   n->l = l;
 252
 253   n->next = NULL;
 254   n->prev = lua_tail;
 255   n->nicks = NULL;
 256   n->sockets = NULL;
 257   n->schedulers = NULL;
 258
 259   if(!lua_head) {
 260     lua_head = n;
 261   } else {
 262     lua_tail->next = n;
 263   }
 264
 265   lua_tail = n;
 266
 267   top = lua_gettop(l);
 268
 269   if(lua_pcall(l, 0, 0, 0)) {
 270     Error("lua", ERR_ERROR, "Error pcalling: %s.", file);
 271     lua_close(l);
 272     freesstring(n->name);
 273
 274     if(lua_head == n)
 275       lua_head = NULL;
 276
 277     lua_tail = n->prev;
 278     if(lua_tail)
 279       lua_tail->next = NULL;
 280
 281     luafree(n);
 282     return NULL;
 283   }
 284
 285   lua_settop(l, top);
 286
 287   Error("lua", ERR_INFO, "Loaded %s.", file);
 288   lua_onload(l);
 289
 290   return l;
 291 }
 292
 293 void lua_unloadscript(lua_list *l) {
 294   lua_onunload(l->l);
 295   lua_deregisternicks(l);
 296   lua_socket_closeall(l);
 297   lua_scheduler_freeall(l);
 298   lua_close(l->l);
 299   freesstring(l->name);
 300
 301   /* well, at least it's O(1) */
 302
 303   if(!l->prev) { /* head */
 304     lua_head = l->next;
 305     if(!lua_head) {
 306       lua_tail = NULL;
 307     } else {
 308       lua_head->prev = NULL;
 309     }
 310   } else {
 311     if(!l->next) { /* tail */
 312       lua_tail = lua_tail->prev;
 313       if(!lua_tail) {
 314         lua_head = NULL;
 315       } else {
 316         lua_tail->next = NULL;
 317       }
 318     } else {
 319       l->prev->next = l->next;
 320       l->next->prev = l->prev;
 321      }
 322   }
 323
 324   luafree(l);
 325 }
 326
 327 void lua_setpath(void) {
 328   char fullpath[LUA_PATHLEN];
 329
 330   snprintf(fullpath, sizeof(fullpath), "%s/?%s", cpath->content, suffix->content);
 331   setenv("LUA_PATH", fullpath, 1);
 332 }
 333
 334 lua_list *lua_scriptloaded(char *name) {
 335   lua_list *l;
 336
 337   for(l=lua_head;l;l=l->next)
 338     if(!strcmp(l->name->content, name))
 339       return l;
 340
 341   return NULL;
 342 }
 343
 344 void lua_loadlibs(lua_State *l) {
 345   const luaL_Reg *lib = ourlibs;
 346
 347   for (;lib->func;lib++) {
 348     lua_pushcfunction(l, lib->func);
 349     lua_pushstring(l, lib->name);
 350     lua_call(l, 1, 0);
 351   }
 352 }
 353
 354 void lua_require(lua_State *l, char *module) {
 355   int top = lua_gettop(l);
 356
 357   lua_getglobal(l, "require");
 358   lua_pushstring(l, module);
 359
 360   if(lua_pcall(l, 1, 1, 0))
 361     Error("lua", ERR_ERROR, "Error requiring %s: %s", module, lua_tostring(l, -1));
 362
 363   lua_settop(l, top);
 364 }
 365
 366 void lua_setupdebugsocket(void) {
 367 #ifdef LUA_DEBUGSOCKET
 368
 369   debugsocket = socket(AF_INET, SOCK_DGRAM, 0);
 370   if(debugsocket < 0) {
 371     debugsocket = -1;
 372     Error("lua", ERR_ERROR, "Cannot create debug socket.");
 373
 374     return;
 375   }
 376
 377   memset(&debugsocketdest, 0, sizeof(debugsocketdest));
 378
 379   debugsocketdest.sin_family = AF_INET;
 380   debugsocketdest.sin_port = htons(LUA_DEBUGSOCKET_PORT);
 381   debugsocketdest.sin_addr.s_addr = inet_addr(LUA_DEBUGSOCKET_ADDRESS);
 382
 383 #endif
 384 }
 385
 386 void lua_freedebugsocket(void) {
 387 #ifdef LUA_DEBUGSOCKET
 388
 389   if(debugsocket == -1)
 390     return;
 391
 392   close(debugsocket);
 393
 394
 395   debugsocket = -1;
 396
 397 #endif
 398 }
 399
 400 #ifdef LUA_DEBUGSOCKET
 401 void lua_debugoutput(char *format, ...) {
 402   char buf[1024];
 403   va_list va;
 404   int size;
 405
 406   if(debugsocket == -1)
 407     return;
 408
 409   va_start(va, format);
 410   size = vsnprintf(buf, sizeof(buf), format, va);
 411   va_end(va);
 412
 413   if(size >= sizeof(buf))
 414     size = sizeof(buf) - 1;
 415
 416   if(size > 0)
 417     sendto(debugsocket, buf, size, 0, (struct sockaddr *)&debugsocketdest, sizeof(debugsocketdest));
 418 }
 419 #endif
 420
 421 lua_list *lua_listfromstate(lua_State *l) {
 422   lua_list *i = lua_head;
 423   for(;i;i=i->next)
 424     if(i->l == l)
 425       return i;
 426
 427   return &dummy;
 428 }
 429
 430 int lua_listexists(lua_list *l) {
 431   lua_list *i;
 432
 433   for(i=lua_head;i;i=i->next)
 434     if(i == l)
 435       return 1;
 436
 437   return 0;
 438 }
 439
 440 int lua_lineok(const char *data) {
 441   if(strchr(data, '\r') || strchr(data, '\n'))
 442     return 0;
 443   return 1;
 444 }
 445
 446 int lua_debugpcall(lua_State *l, char *message, int a, int b, int c) {
 447   lua_list *l2 = lua_listfromstate(l);
 448   int ret;
 449
 450 #ifdef LUA_DEBUGSOCKET
 451   DEBUGOUT("%s: %s\n", l2->name->content, message);
 452 #endif
 453
 454 #ifdef LUA_PROFILE
 455   ACCOUNTING_START(l2);
 456 #endif
 457
 458   ret = lua_pcall(l, a, b, c);
 459
 460 #ifdef LUA_PROFILE
 461   ACCOUNTING_STOP(l2);
 462 #endif
 463
 464   return ret;
 465 }
 466