mirror of
https://github.com/bjc/prosody.git
synced 2025-04-03 21:27:38 +03:00
386 lines
9.3 KiB
C
386 lines
9.3 KiB
C
/* Prosody IM
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-- Copyright (C) 2008-2010 Matthew Wild
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-- Copyright (C) 2008-2010 Waqas Hussain
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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*/
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/*
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* encodings.c
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* Lua library for base64, stringprep and idna encodings
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*/
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/* Newer MSVC compilers deprecate strcpy as unsafe, but we use it in a safe way */
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#define _CRT_SECURE_NO_DEPRECATE
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#include <string.h>
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#include <stdlib.h>
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#include "lua.h"
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#include "lauxlib.h"
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/***************** BASE64 *****************/
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static const char code[]=
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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static void base64_encode(luaL_Buffer *b, unsigned int c1, unsigned int c2, unsigned int c3, int n)
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{
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unsigned long tuple=c3+256UL*(c2+256UL*c1);
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int i;
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char s[4];
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for (i=0; i<4; i++) {
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s[3-i] = code[tuple % 64];
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tuple /= 64;
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}
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for (i=n+1; i<4; i++) s[i]='=';
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luaL_addlstring(b,s,4);
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}
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static int Lbase64_encode(lua_State *L) /** encode(s) */
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{
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size_t l;
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const unsigned char *s=(const unsigned char*)luaL_checklstring(L,1,&l);
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luaL_Buffer b;
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int n;
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luaL_buffinit(L,&b);
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for (n=l/3; n--; s+=3) base64_encode(&b,s[0],s[1],s[2],3);
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switch (l%3)
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{
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case 1: base64_encode(&b,s[0],0,0,1); break;
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case 2: base64_encode(&b,s[0],s[1],0,2); break;
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}
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luaL_pushresult(&b);
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return 1;
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}
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static void base64_decode(luaL_Buffer *b, int c1, int c2, int c3, int c4, int n)
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{
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unsigned long tuple=c4+64L*(c3+64L*(c2+64L*c1));
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char s[3];
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switch (--n)
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{
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case 3: s[2]=(char) tuple;
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case 2: s[1]=(char) (tuple >> 8);
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case 1: s[0]=(char) (tuple >> 16);
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}
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luaL_addlstring(b,s,n);
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}
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static int Lbase64_decode(lua_State *L) /** decode(s) */
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{
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size_t l;
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const char *s=luaL_checklstring(L,1,&l);
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luaL_Buffer b;
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int n=0;
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char t[4];
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luaL_buffinit(L,&b);
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for (;;)
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{
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int c=*s++;
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switch (c)
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{
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const char *p;
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default:
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p=strchr(code,c); if (p==NULL) return 0;
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t[n++]= (char) (p-code);
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if (n==4)
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{
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base64_decode(&b,t[0],t[1],t[2],t[3],4);
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n=0;
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}
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break;
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case '=':
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switch (n)
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{
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case 1: base64_decode(&b,t[0],0,0,0,1); break;
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case 2: base64_decode(&b,t[0],t[1],0,0,2); break;
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case 3: base64_decode(&b,t[0],t[1],t[2],0,3); break;
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}
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n=0;
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break;
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case 0:
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luaL_pushresult(&b);
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return 1;
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case '\n': case '\r': case '\t': case ' ': case '\f': case '\b':
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break;
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}
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}
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}
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static const luaL_Reg Reg_base64[] =
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{
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{ "encode", Lbase64_encode },
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{ "decode", Lbase64_decode },
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{ NULL, NULL }
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};
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/***************** STRINGPREP *****************/
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#ifdef USE_STRINGPREP_ICU
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#include <unicode/usprep.h>
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#include <unicode/ustring.h>
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#include <unicode/utrace.h>
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static int icu_stringprep_prep(lua_State *L, const UStringPrepProfile *profile)
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{
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size_t input_len;
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int32_t unprepped_len, prepped_len, output_len;
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const char *input;
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char output[1024];
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UChar unprepped[1024]; /* Temporary unicode buffer (1024 characters) */
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UChar prepped[1024];
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UErrorCode err = U_ZERO_ERROR;
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if(!lua_isstring(L, 1)) {
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lua_pushnil(L);
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return 1;
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}
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input = lua_tolstring(L, 1, &input_len);
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if (input_len >= 1024) {
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lua_pushnil(L);
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return 1;
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}
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u_strFromUTF8(unprepped, 1024, &unprepped_len, input, input_len, &err);
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if (U_FAILURE(err)) {
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lua_pushnil(L);
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return 1;
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}
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prepped_len = usprep_prepare(profile, unprepped, unprepped_len, prepped, 1024, 0, NULL, &err);
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if (U_FAILURE(err)) {
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lua_pushnil(L);
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return 1;
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} else {
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u_strToUTF8(output, 1024, &output_len, prepped, prepped_len, &err);
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if (U_SUCCESS(err) && output_len < 1024)
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lua_pushlstring(L, output, output_len);
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else
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lua_pushnil(L);
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return 1;
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}
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}
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UStringPrepProfile *icu_nameprep;
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UStringPrepProfile *icu_nodeprep;
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UStringPrepProfile *icu_resourceprep;
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UStringPrepProfile *icu_saslprep;
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/* initialize global ICU stringprep profiles */
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void init_icu()
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{
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UErrorCode err = U_ZERO_ERROR;
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utrace_setLevel(UTRACE_VERBOSE);
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icu_nameprep = usprep_openByType(USPREP_RFC3491_NAMEPREP, &err);
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icu_nodeprep = usprep_openByType(USPREP_RFC3920_NODEPREP, &err);
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icu_resourceprep = usprep_openByType(USPREP_RFC3920_RESOURCEPREP, &err);
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icu_saslprep = usprep_openByType(USPREP_RFC4013_SASLPREP, &err);
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if (U_FAILURE(err)) fprintf(stderr, "[c] util.encodings: error: %s\n", u_errorName((UErrorCode)err));
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}
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#define MAKE_PREP_FUNC(myFunc, prep) \
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static int myFunc(lua_State *L) { return icu_stringprep_prep(L, prep); }
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MAKE_PREP_FUNC(Lstringprep_nameprep, icu_nameprep) /** stringprep.nameprep(s) */
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MAKE_PREP_FUNC(Lstringprep_nodeprep, icu_nodeprep) /** stringprep.nodeprep(s) */
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MAKE_PREP_FUNC(Lstringprep_resourceprep, icu_resourceprep) /** stringprep.resourceprep(s) */
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MAKE_PREP_FUNC(Lstringprep_saslprep, icu_saslprep) /** stringprep.saslprep(s) */
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static const luaL_Reg Reg_stringprep[] =
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{
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{ "nameprep", Lstringprep_nameprep },
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{ "nodeprep", Lstringprep_nodeprep },
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{ "resourceprep", Lstringprep_resourceprep },
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{ "saslprep", Lstringprep_saslprep },
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{ NULL, NULL }
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};
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#else /* USE_STRINGPREP_ICU */
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/****************** libidn ********************/
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#include <stringprep.h>
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static int stringprep_prep(lua_State *L, const Stringprep_profile *profile)
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{
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size_t len;
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const char *s;
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char string[1024];
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int ret;
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if(!lua_isstring(L, 1)) {
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lua_pushnil(L);
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return 1;
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}
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s = lua_tolstring(L, 1, &len);
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if (len >= 1024) {
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lua_pushnil(L);
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return 1; /* TODO return error message */
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}
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strcpy(string, s);
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ret = stringprep(string, 1024, (Stringprep_profile_flags)0, profile);
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if (ret == STRINGPREP_OK) {
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lua_pushstring(L, string);
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return 1;
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} else {
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lua_pushnil(L);
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return 1; /* TODO return error message */
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}
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}
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#define MAKE_PREP_FUNC(myFunc, prep) \
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static int myFunc(lua_State *L) { return stringprep_prep(L, prep); }
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MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep) /** stringprep.nameprep(s) */
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MAKE_PREP_FUNC(Lstringprep_nodeprep, stringprep_xmpp_nodeprep) /** stringprep.nodeprep(s) */
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MAKE_PREP_FUNC(Lstringprep_resourceprep, stringprep_xmpp_resourceprep) /** stringprep.resourceprep(s) */
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MAKE_PREP_FUNC(Lstringprep_saslprep, stringprep_saslprep) /** stringprep.saslprep(s) */
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static const luaL_Reg Reg_stringprep[] =
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{
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{ "nameprep", Lstringprep_nameprep },
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{ "nodeprep", Lstringprep_nodeprep },
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{ "resourceprep", Lstringprep_resourceprep },
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{ "saslprep", Lstringprep_saslprep },
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{ NULL, NULL }
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};
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#endif
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/***************** IDNA *****************/
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#ifdef USE_STRINGPREP_ICU
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#include <unicode/ustdio.h>
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#include <unicode/uidna.h>
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/* IDNA2003 or IDNA2008 ? ? ? */
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static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */
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{
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size_t len;
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int32_t ulen, dest_len, output_len;
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const char *s = luaL_checklstring(L, 1, &len);
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UChar ustr[1024];
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UErrorCode err = U_ZERO_ERROR;
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UChar dest[1024];
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char output[1024];
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u_strFromUTF8(ustr, 1024, &ulen, s, len, &err);
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if (U_FAILURE(err)) {
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lua_pushnil(L);
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return 1;
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}
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dest_len = uidna_IDNToASCII(ustr, ulen, dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err);
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if (U_FAILURE(err)) {
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lua_pushnil(L);
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return 1;
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} else {
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u_strToUTF8(output, 1024, &output_len, dest, dest_len, &err);
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if (U_SUCCESS(err) && output_len < 1024)
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lua_pushlstring(L, output, output_len);
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else
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lua_pushnil(L);
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return 1;
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}
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}
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static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */
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{
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size_t len;
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int32_t ulen, dest_len, output_len;
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const char *s = luaL_checklstring(L, 1, &len);
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UChar ustr[1024];
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UErrorCode err = U_ZERO_ERROR;
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UChar dest[1024];
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char output[1024];
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u_strFromUTF8(ustr, 1024, &ulen, s, len, &err);
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if (U_FAILURE(err)) {
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lua_pushnil(L);
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return 1;
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}
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dest_len = uidna_IDNToUnicode(ustr, ulen, dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err);
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if (U_FAILURE(err)) {
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lua_pushnil(L);
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return 1;
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} else {
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u_strToUTF8(output, 1024, &output_len, dest, dest_len, &err);
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if (U_SUCCESS(err) && output_len < 1024)
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lua_pushlstring(L, output, output_len);
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else
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lua_pushnil(L);
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return 1;
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}
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}
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#else /* USE_STRINGPREP_ICU */
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/****************** libidn ********************/
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#include <idna.h>
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#include <idn-free.h>
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static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */
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{
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size_t len;
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const char *s = luaL_checklstring(L, 1, &len);
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char* output = NULL;
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int ret = idna_to_ascii_8z(s, &output, IDNA_USE_STD3_ASCII_RULES);
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if (ret == IDNA_SUCCESS) {
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lua_pushstring(L, output);
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idn_free(output);
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return 1;
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} else {
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lua_pushnil(L);
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idn_free(output);
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return 1; /* TODO return error message */
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}
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}
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static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */
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{
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size_t len;
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const char *s = luaL_checklstring(L, 1, &len);
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char* output = NULL;
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int ret = idna_to_unicode_8z8z(s, &output, 0);
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if (ret == IDNA_SUCCESS) {
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lua_pushstring(L, output);
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idn_free(output);
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return 1;
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} else {
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lua_pushnil(L);
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idn_free(output);
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return 1; /* TODO return error message */
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}
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}
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#endif
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static const luaL_Reg Reg_idna[] =
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{
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{ "to_ascii", Lidna_to_ascii },
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{ "to_unicode", Lidna_to_unicode },
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{ NULL, NULL }
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};
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/***************** end *****************/
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LUALIB_API int luaopen_util_encodings(lua_State *L)
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{
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#ifdef USE_STRINGPREP_ICU
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init_icu();
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#endif
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lua_newtable(L);
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lua_newtable(L);
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luaL_register(L, NULL, Reg_base64);
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lua_setfield(L, -2, "base64");
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lua_newtable(L);
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luaL_register(L, NULL, Reg_stringprep);
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lua_setfield(L, -2, "stringprep");
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lua_newtable(L);
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luaL_register(L, NULL, Reg_idna);
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lua_setfield(L, -2, "idna");
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lua_pushliteral(L, "-3.14");
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lua_setfield(L, -2, "version");
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return 1;
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}
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