X-Git-Url: https://git.enpas.org/?a=blobdiff_plain;f=util-src%2Fencodings.c;h=5fa9706b63bbe306c09ed96fe0cfd3417f85528b;hb=e79fcdc14be15b1625b0730499b40c4fc214e252;hp=5fe2c805ed58f720dc8e693b6329508ec54cedfd;hpb=c00e989679061329be7431b6f9df96886f7bbf06;p=prosody.git

diff --git a/util-src/encodings.c b/util-src/encodings.c
index 5fe2c805..5fa9706b 100644
--- a/util-src/encodings.c
+++ b/util-src/encodings.c
@@ -1,227 +1,481 @@
-/*
-* 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;
-				}
-			case 0:
-				luaL_pushresult(&b);
-				return 1;
-			case '\n': case '\r': case '\t': case ' ': case '\f': case '\b':
-				break;
-		}
-	}
-	return 0;
-}
-
-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 = luaL_checklstring(L, 1, &len);
-	char string[1024];
-	int ret;
-	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>
-
-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, 0);
-	if (ret == IDNA_SUCCESS) {
-		lua_pushstring(L, output);
-		if (output) free(output);
-		return 1;
-	} else {
-		lua_pushnil(L);
-		if (output) 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);
-		if (output) free(output);
-		return 1;
-	} else {
-		lua_pushnil(L);
-		if (output) 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;
-}
+/* 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 == 502)
+#define luaL_register(L, N, R) luaL_setfuncs(L, R, 0)
+#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);
+	if (s == NULL || len != strlen(s)) {
+		lua_pushnil(L);
+		return 1; /* TODO return error message */
+	}
+	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 */
+	}
+}
+#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_register(L, NULL, Reg_base64);
+	lua_setfield(L, -2, "base64");
+
+	lua_newtable(L);
+	luaL_register(L, NULL, Reg_stringprep);
+	lua_setfield(L, -2, "stringprep");
+
+	lua_newtable(L);
+	luaL_register(L, NULL, Reg_idna);
+	lua_setfield(L, -2, "idna");
+
+	lua_newtable(L);
+	luaL_register(L, NULL, Reg_utf8);
+	lua_setfield(L, -2, "utf8");
+
+	lua_pushliteral(L, "-3.14");
+	lua_setfield(L, -2, "version");
+	return 1;
+}