/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) Daniel Stenberg, , et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at https://curl.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * * SPDX-License-Identifier: curl * ***************************************************************************/ /* * IDN conversions */ #include "curl_setup.h" #include "urldata.h" #include "idn.h" #include "sendf.h" #include "curl_multibyte.h" #include "warnless.h" #ifdef USE_LIBIDN2 #include #if defined(_WIN32) && defined(UNICODE) #define IDN2_LOOKUP(name, host, flags) \ idn2_lookup_u8((const uint8_t *)name, (uint8_t **)host, flags) #else #define IDN2_LOOKUP(name, host, flags) \ idn2_lookup_ul((const char *)name, (char **)host, flags) #endif #endif /* USE_LIBIDN2 */ /* The last 3 #include files should be in this order */ #include "curl_printf.h" #include "curl_memory.h" #include "memdebug.h" #ifdef USE_WIN32_IDN /* using Windows kernel32 and normaliz libraries. */ #if !defined(_WIN32_WINNT) || _WIN32_WINNT < 0x600 WINBASEAPI int WINAPI IdnToAscii(DWORD dwFlags, const WCHAR *lpUnicodeCharStr, int cchUnicodeChar, WCHAR *lpASCIICharStr, int cchASCIIChar); WINBASEAPI int WINAPI IdnToUnicode(DWORD dwFlags, const WCHAR *lpASCIICharStr, int cchASCIIChar, WCHAR *lpUnicodeCharStr, int cchUnicodeChar); #endif #define IDN_MAX_LENGTH 255 static CURLcode win32_idn_to_ascii(const char *in, char **out) { wchar_t *in_w = curlx_convert_UTF8_to_wchar(in); *out = NULL; if(in_w) { wchar_t punycode[IDN_MAX_LENGTH]; int chars = IdnToAscii(0, in_w, (int)(wcslen(in_w) + 1), punycode, IDN_MAX_LENGTH); curlx_unicodefree(in_w); if(chars) { char *mstr = curlx_convert_wchar_to_UTF8(punycode); if(mstr) { *out = strdup(mstr); curlx_unicodefree(mstr); if(!*out) return CURLE_OUT_OF_MEMORY; } else return CURLE_OUT_OF_MEMORY; } else return CURLE_URL_MALFORMAT; } else return CURLE_URL_MALFORMAT; return CURLE_OK; } static CURLcode win32_ascii_to_idn(const char *in, char **output) { char *out = NULL; wchar_t *in_w = curlx_convert_UTF8_to_wchar(in); if(in_w) { WCHAR idn[IDN_MAX_LENGTH]; /* stores a UTF-16 string */ int chars = IdnToUnicode(0, in_w, (int)(wcslen(in_w) + 1), idn, IDN_MAX_LENGTH); if(chars) { /* 'chars' is "the number of characters retrieved" */ char *mstr = curlx_convert_wchar_to_UTF8(idn); if(mstr) { out = strdup(mstr); curlx_unicodefree(mstr); if(!out) return CURLE_OUT_OF_MEMORY; } } else return CURLE_URL_MALFORMAT; } else return CURLE_URL_MALFORMAT; *output = out; return CURLE_OK; } #endif /* USE_WIN32_IDN */ /* * Helpers for IDNA conversions. */ bool Curl_is_ASCII_name(const char *hostname) { /* get an UNSIGNED local version of the pointer */ const unsigned char *ch = (const unsigned char *)hostname; if(!hostname) /* bad input, consider it ASCII! */ return TRUE; while(*ch) { if(*ch++ & 0x80) return FALSE; } return TRUE; } #ifdef USE_IDN /* * Curl_idn_decode() returns an allocated IDN decoded string if it was * possible. NULL on error. * * CURLE_URL_MALFORMAT - the host name could not be converted * CURLE_OUT_OF_MEMORY - memory problem * */ static CURLcode idn_decode(const char *input, char **output) { char *decoded = NULL; CURLcode result = CURLE_OK; #ifdef USE_LIBIDN2 if(idn2_check_version(IDN2_VERSION)) { int flags = IDN2_NFC_INPUT #if IDN2_VERSION_NUMBER >= 0x00140000 /* IDN2_NFC_INPUT: Normalize input string using normalization form C. IDN2_NONTRANSITIONAL: Perform Unicode TR46 non-transitional processing. */ | IDN2_NONTRANSITIONAL #endif ; int rc = IDN2_LOOKUP(input, &decoded, flags); if(rc != IDN2_OK) /* fallback to TR46 Transitional mode for better IDNA2003 compatibility */ rc = IDN2_LOOKUP(input, &decoded, IDN2_TRANSITIONAL); if(rc != IDN2_OK) result = CURLE_URL_MALFORMAT; } else /* a too old libidn2 version */ result = CURLE_NOT_BUILT_IN; #elif defined(USE_WIN32_IDN) result = win32_idn_to_ascii(input, &decoded); #endif if(!result) *output = decoded; return result; } static CURLcode idn_encode(const char *puny, char **output) { char *enc = NULL; #ifdef USE_LIBIDN2 int rc = idn2_to_unicode_8z8z(puny, &enc, 0); if(rc != IDNA_SUCCESS) return rc == IDNA_MALLOC_ERROR ? CURLE_OUT_OF_MEMORY : CURLE_URL_MALFORMAT; #elif defined(USE_WIN32_IDN) CURLcode result = win32_ascii_to_idn(puny, &enc); if(result) return result; #endif *output = enc; return CURLE_OK; } CURLcode Curl_idn_decode(const char *input, char **output) { char *d = NULL; CURLcode result = idn_decode(input, &d); #ifdef USE_LIBIDN2 if(!result) { char *c = strdup(d); idn2_free(d); if(c) d = c; else result = CURLE_OUT_OF_MEMORY; } #endif if(!result) *output = d; return result; } CURLcode Curl_idn_encode(const char *puny, char **output) { char *d = NULL; CURLcode result = idn_encode(puny, &d); #ifdef USE_LIBIDN2 if(!result) { char *c = strdup(d); idn2_free(d); if(c) d = c; else result = CURLE_OUT_OF_MEMORY; } #endif if(!result) *output = d; return result; } /* * Frees data allocated by idnconvert_hostname() */ void Curl_free_idnconverted_hostname(struct hostname *host) { Curl_safefree(host->encalloc); } #endif /* USE_IDN */ /* * Perform any necessary IDN conversion of hostname */ CURLcode Curl_idnconvert_hostname(struct hostname *host) { /* set the name we use to display the host name */ host->dispname = host->name; #ifdef USE_IDN /* Check name for non-ASCII and convert hostname if we can */ if(!Curl_is_ASCII_name(host->name)) { char *decoded; CURLcode result = Curl_idn_decode(host->name, &decoded); if(result) return result; /* successful */ host->name = host->encalloc = decoded; } #endif return CURLE_OK; }