/* Prosody IM -- Copyright (C) 2008-2010 Matthew Wild -- Copyright (C) 2008-2010 Waqas Hussain -- Copyright (C) 1994-2015 Lua.org, PUC-Rio. -- -- 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" #if (LUA_VERSION_NUM == 501) #define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R) #endif /***************** 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 } }; /******************* UTF-8 ********************/ /* * Adapted from Lua 5.3 * Needed because libidn does not validate that input is valid UTF-8 */ #define MAXUNICODE 0x10FFFF /* * Decode one UTF-8 sequence, returning NULL if byte sequence is invalid. */ static const char* utf8_decode(const char* o, int* val) { static unsigned int limits[] = {0xFF, 0x7F, 0x7FF, 0xFFFF}; const unsigned char* s = (const unsigned char*)o; unsigned int c = s[0]; unsigned int res = 0; /* final result */ if(c < 0x80) { /* ascii? */ res = c; } else { int count = 0; /* to count number of continuation bytes */ while(c & 0x40) { /* still have continuation bytes? */ int cc = s[++count]; /* read next byte */ if((cc & 0xC0) != 0x80) { /* not a continuation byte? */ return NULL; /* invalid byte sequence */ } res = (res << 6) | (cc & 0x3F); /* add lower 6 bits from cont. byte */ c <<= 1; /* to test next bit */ } res |= ((c & 0x7F) << (count * 5)); /* add first byte */ if(count > 3 || res > MAXUNICODE || res <= limits[count] || (0xd800 <= res && res <= 0xdfff)) { return NULL; /* invalid byte sequence */ } s += count; /* skip continuation bytes read */ } if(val) { *val = res; } return (const char*)s + 1; /* +1 to include first byte */ } /* * Check that a string is valid UTF-8 * Returns NULL if not */ const char* check_utf8(lua_State* L, int idx, size_t* l) { size_t pos, len; const char* s = luaL_checklstring(L, 1, &len); pos = 0; while(pos <= len) { const char* s1 = utf8_decode(s + pos, NULL); if(s1 == NULL) { /* conversion error? */ return NULL; } pos = s1 - s; } if(l != NULL) { *l = len; } return s; } static int Lutf8_valid(lua_State* L) { lua_pushboolean(L, check_utf8(L, 1, NULL) != NULL); return 1; } static int Lutf8_length(lua_State* L) { size_t len; if(!check_utf8(L, 1, &len)) { lua_pushnil(L); lua_pushliteral(L, "invalid utf8"); return 2; } lua_pushinteger(L, len); return 1; } static const luaL_Reg Reg_utf8[] = { { "valid", Lutf8_valid }, { "length", Lutf8_length }, { NULL, NULL } }; /***************** STRINGPREP *****************/ #ifdef USE_STRINGPREP_ICU #include <unicode/usprep.h> #include <unicode/ustring.h> #include <unicode/utrace.h> static int icu_stringprep_prep(lua_State* L, const UStringPrepProfile* profile) { size_t input_len; int32_t unprepped_len, prepped_len, output_len; const char* input; char output[1024]; UChar unprepped[1024]; /* Temporary unicode buffer (1024 characters) */ UChar prepped[1024]; UErrorCode err = U_ZERO_ERROR; if(!lua_isstring(L, 1)) { lua_pushnil(L); return 1; } input = lua_tolstring(L, 1, &input_len); if(input_len >= 1024) { lua_pushnil(L); return 1; } u_strFromUTF8(unprepped, 1024, &unprepped_len, input, input_len, &err); if(U_FAILURE(err)) { lua_pushnil(L); return 1; } prepped_len = usprep_prepare(profile, unprepped, unprepped_len, prepped, 1024, 0, NULL, &err); if(U_FAILURE(err)) { lua_pushnil(L); return 1; } else { u_strToUTF8(output, 1024, &output_len, prepped, prepped_len, &err); if(U_SUCCESS(err) && output_len < 1024) { lua_pushlstring(L, output, output_len); } else { lua_pushnil(L); } return 1; } } UStringPrepProfile* icu_nameprep; UStringPrepProfile* icu_nodeprep; UStringPrepProfile* icu_resourceprep; UStringPrepProfile* icu_saslprep; /* initialize global ICU stringprep profiles */ void init_icu() { UErrorCode err = U_ZERO_ERROR; utrace_setLevel(UTRACE_VERBOSE); icu_nameprep = usprep_openByType(USPREP_RFC3491_NAMEPREP, &err); icu_nodeprep = usprep_openByType(USPREP_RFC3920_NODEPREP, &err); icu_resourceprep = usprep_openByType(USPREP_RFC3920_RESOURCEPREP, &err); icu_saslprep = usprep_openByType(USPREP_RFC4013_SASLPREP, &err); if(U_FAILURE(err)) { fprintf(stderr, "[c] util.encodings: error: %s\n", u_errorName((UErrorCode)err)); } } #define MAKE_PREP_FUNC(myFunc, prep) \ static int myFunc(lua_State *L) { return icu_stringprep_prep(L, prep); } MAKE_PREP_FUNC(Lstringprep_nameprep, icu_nameprep) /** stringprep.nameprep(s) */ MAKE_PREP_FUNC(Lstringprep_nodeprep, icu_nodeprep) /** stringprep.nodeprep(s) */ MAKE_PREP_FUNC(Lstringprep_resourceprep, icu_resourceprep) /** stringprep.resourceprep(s) */ MAKE_PREP_FUNC(Lstringprep_saslprep, icu_saslprep) /** stringprep.saslprep(s) */ static const luaL_Reg Reg_stringprep[] = { { "nameprep", Lstringprep_nameprep }, { "nodeprep", Lstringprep_nodeprep }, { "resourceprep", Lstringprep_resourceprep }, { "saslprep", Lstringprep_saslprep }, { NULL, NULL } }; #else /* USE_STRINGPREP_ICU */ /****************** libidn ********************/ #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 = check_utf8(L, 1, &len); if(s == NULL || len >= 1024 || len != strlen(s)) { lua_pushnil(L); return 1; /* TODO return error message */ } strcpy(string, s); ret = stringprep(string, 1024, (Stringprep_profile_flags)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 } }; #endif /***************** IDNA *****************/ #ifdef USE_STRINGPREP_ICU #include <unicode/ustdio.h> #include <unicode/uidna.h> /* IDNA2003 or IDNA2008 ? ? ? */ static int Lidna_to_ascii(lua_State* L) { /** idna.to_ascii(s) */ size_t len; int32_t ulen, dest_len, output_len; const char* s = luaL_checklstring(L, 1, &len); UChar ustr[1024]; UErrorCode err = U_ZERO_ERROR; UChar dest[1024]; char output[1024]; u_strFromUTF8(ustr, 1024, &ulen, s, len, &err); if(U_FAILURE(err)) { lua_pushnil(L); return 1; } dest_len = uidna_IDNToASCII(ustr, ulen, dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err); if(U_FAILURE(err)) { lua_pushnil(L); return 1; } else { u_strToUTF8(output, 1024, &output_len, dest, dest_len, &err); if(U_SUCCESS(err) && output_len < 1024) { lua_pushlstring(L, output, output_len); } else { lua_pushnil(L); } return 1; } } static int Lidna_to_unicode(lua_State* L) { /** idna.to_unicode(s) */ size_t len; int32_t ulen, dest_len, output_len; const char* s = luaL_checklstring(L, 1, &len); UChar ustr[1024]; UErrorCode err = U_ZERO_ERROR; UChar dest[1024]; char output[1024]; u_strFromUTF8(ustr, 1024, &ulen, s, len, &err); if(U_FAILURE(err)) { lua_pushnil(L); return 1; } dest_len = uidna_IDNToUnicode(ustr, ulen, dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err); if(U_FAILURE(err)) { lua_pushnil(L); return 1; } else { u_strToUTF8(output, 1024, &output_len, dest, dest_len, &err); if(U_SUCCESS(err) && output_len < 1024) { lua_pushlstring(L, output, output_len); } else { lua_pushnil(L); } return 1; } } #else /* USE_STRINGPREP_ICU */ /****************** libidn ********************/ #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 = check_utf8(L, 1, &len); char* output = NULL; int ret; if(s == NULL || len != strlen(s)) { lua_pushnil(L); return 1; /* TODO return error message */ } 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 */ } } #endif static const luaL_Reg Reg_idna[] = { { "to_ascii", Lidna_to_ascii }, { "to_unicode", Lidna_to_unicode }, { NULL, NULL } }; /***************** end *****************/ LUALIB_API int luaopen_util_encodings(lua_State* L) { #ifdef USE_STRINGPREP_ICU init_icu(); #endif lua_newtable(L); lua_newtable(L); luaL_setfuncs(L, Reg_base64, 0); lua_setfield(L, -2, "base64"); lua_newtable(L); luaL_setfuncs(L, Reg_stringprep, 0); lua_setfield(L, -2, "stringprep"); lua_newtable(L); luaL_setfuncs(L, Reg_idna, 0); lua_setfield(L, -2, "idna"); lua_newtable(L); luaL_setfuncs(L, Reg_utf8, 0); lua_setfield(L, -2, "utf8"); lua_pushliteral(L, "-3.14"); lua_setfield(L, -2, "version"); return 1; }