/* Prosody IM -- Copyright (C) 2008-2010 Matthew Wild -- Copyright (C) 2008-2010 Waqas Hussain -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- */ /* * encodings.c * Lua library for base64, stringprep and idna encodings */ // Newer MSVC compilers deprecate strcpy as unsafe, but we use it in a safe way #define _CRT_SECURE_NO_DEPRECATE #include <string.h> #include <stdlib.h> #include "lua.h" #include "lauxlib.h" /***************** BASE64 *****************/ static const char code[]= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; static void base64_encode(luaL_Buffer *b, unsigned int c1, unsigned int c2, unsigned int c3, int n) { unsigned long tuple=c3+256UL*(c2+256UL*c1); int i; char s[4]; for (i=0; i<4; i++) { s[3-i] = code[tuple % 64]; tuple /= 64; } for (i=n+1; i<4; i++) s[i]='='; luaL_addlstring(b,s,4); } static int Lbase64_encode(lua_State *L) /** encode(s) */ { size_t l; const unsigned char *s=(const unsigned char*)luaL_checklstring(L,1,&l); luaL_Buffer b; int n; luaL_buffinit(L,&b); for (n=l/3; n--; s+=3) base64_encode(&b,s[0],s[1],s[2],3); switch (l%3) { case 1: base64_encode(&b,s[0],0,0,1); break; case 2: base64_encode(&b,s[0],s[1],0,2); break; } luaL_pushresult(&b); return 1; } static void base64_decode(luaL_Buffer *b, int c1, int c2, int c3, int c4, int n) { unsigned long tuple=c4+64L*(c3+64L*(c2+64L*c1)); char s[3]; switch (--n) { case 3: s[2]=(char) tuple; case 2: s[1]=(char) (tuple >> 8); case 1: s[0]=(char) (tuple >> 16); } luaL_addlstring(b,s,n); } static int Lbase64_decode(lua_State *L) /** decode(s) */ { size_t l; const char *s=luaL_checklstring(L,1,&l); luaL_Buffer b; int n=0; char t[4]; luaL_buffinit(L,&b); for (;;) { int c=*s++; switch (c) { const char *p; default: p=strchr(code,c); if (p==NULL) return 0; t[n++]= (char) (p-code); if (n==4) { base64_decode(&b,t[0],t[1],t[2],t[3],4); n=0; } break; case '=': switch (n) { case 1: base64_decode(&b,t[0],0,0,0,1); break; case 2: base64_decode(&b,t[0],t[1],0,0,2); break; case 3: base64_decode(&b,t[0],t[1],t[2],0,3); break; } n=0; break; case 0: luaL_pushresult(&b); return 1; case '\n': case '\r': case '\t': case ' ': case '\f': case '\b': break; } } } static const luaL_Reg Reg_base64[] = { { "encode", Lbase64_encode }, { "decode", Lbase64_decode }, { NULL, NULL } }; /***************** STRINGPREP *****************/ #include <stringprep.h> static int stringprep_prep(lua_State *L, const Stringprep_profile *profile) { size_t len; const char *s; char string[1024]; int ret; if(!lua_isstring(L, 1)) { lua_pushnil(L); return 1; } s = lua_tolstring(L, 1, &len); if (len >= 1024) { lua_pushnil(L); return 1; // TODO return error message } strcpy(string, s); ret = stringprep(string, 1024, 0, profile); if (ret == STRINGPREP_OK) { lua_pushstring(L, string); return 1; } else { lua_pushnil(L); return 1; // TODO return error message } } #define MAKE_PREP_FUNC(myFunc, prep) \ static int myFunc(lua_State *L) { return stringprep_prep(L, prep); } MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep) /** stringprep.nameprep(s) */ MAKE_PREP_FUNC(Lstringprep_nodeprep, stringprep_xmpp_nodeprep) /** stringprep.nodeprep(s) */ MAKE_PREP_FUNC(Lstringprep_resourceprep, stringprep_xmpp_resourceprep) /** stringprep.resourceprep(s) */ MAKE_PREP_FUNC(Lstringprep_saslprep, stringprep_saslprep) /** stringprep.saslprep(s) */ static const luaL_Reg Reg_stringprep[] = { { "nameprep", Lstringprep_nameprep }, { "nodeprep", Lstringprep_nodeprep }, { "resourceprep", Lstringprep_resourceprep }, { "saslprep", Lstringprep_saslprep }, { NULL, NULL } }; /***************** IDNA *****************/ #include <idna.h> #include <idn-free.h> static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */ { size_t len; const char *s = luaL_checklstring(L, 1, &len); char* output = NULL; int ret = idna_to_ascii_8z(s, &output, IDNA_USE_STD3_ASCII_RULES); if (ret == IDNA_SUCCESS) { lua_pushstring(L, output); idn_free(output); return 1; } else { lua_pushnil(L); idn_free(output); return 1; // TODO return error message } } static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */ { size_t len; const char *s = luaL_checklstring(L, 1, &len); char* output = NULL; int ret = idna_to_unicode_8z8z(s, &output, 0); if (ret == IDNA_SUCCESS) { lua_pushstring(L, output); idn_free(output); return 1; } else { lua_pushnil(L); idn_free(output); return 1; // TODO return error message } } static const luaL_Reg Reg_idna[] = { { "to_ascii", Lidna_to_ascii }, { "to_unicode", Lidna_to_unicode }, { NULL, NULL } }; /***************** end *****************/ static const luaL_Reg Reg[] = { { NULL, NULL } }; LUALIB_API int luaopen_util_encodings(lua_State *L) { luaL_register(L, "encodings", Reg); lua_pushliteral(L, "base64"); lua_newtable(L); luaL_register(L, NULL, Reg_base64); lua_settable(L,-3); lua_pushliteral(L, "stringprep"); lua_newtable(L); luaL_register(L, NULL, Reg_stringprep); lua_settable(L,-3); lua_pushliteral(L, "idna"); lua_newtable(L); luaL_register(L, NULL, Reg_idna); lua_settable(L,-3); lua_pushliteral(L, "version"); /** version */ lua_pushliteral(L, "-3.14"); lua_settable(L,-3); return 1; }