idn: rename the files to idn.[ch] and hold all IDN functions

Closes #10094
2026-08-24 19:23:38 +03:00 · 2022-12-14 14:49:59 +01:00 · 2022-12-14 14:49:59 +01:00 · cc0aaf6e82
commit cc0aaf6e82
parent 301812bec2
7 changed files with 220 additions and 221 deletions
--- a/lib/idn.c
+++ b/lib/idn.c
@ -0,0 +1,193 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, 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 <idn2.h>
+
+#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
+
+bool Curl_win32_idn_to_ascii(const char *in, char **out)
+{
+  bool success = FALSE;
+
+  wchar_t *in_w = curlx_convert_UTF8_to_wchar(in);
+  if(in_w) {
+    wchar_t punycode[IDN_MAX_LENGTH];
+    int chars = IdnToAscii(0, 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)
+          success = TRUE;
+      }
+    }
+  }
+
+  return success;
+}
+
+#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.
+ */
+static char *Curl_idn_decode(const char *input)
+{
+  char *decoded = NULL;
+#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)
+      decoded = NULL;
+  }
+#elif defined(USE_WIN32_IDN)
+  if(!Curl_win32_idn_to_ascii(input, &decoded))
+    decoded = NULL;
+#endif
+  return decoded;
+}
+
+/*
+ * Frees data allocated by idnconvert_hostname()
+ */
+void Curl_free_idnconverted_hostname(struct hostname *host)
+{
+#if defined(USE_LIBIDN2)
+  if(host->encalloc) {
+    idn2_free(host->encalloc); /* must be freed with idn2_free() since this was
+                                  allocated by libidn */
+    host->encalloc = NULL;
+  }
+#elif defined(USE_WIN32_IDN)
+  free(host->encalloc); /* must be freed with free() since this was
+                           allocated by Curl_win32_idn_to_ascii */
+  host->encalloc = NULL;
+#else
+  (void)host;
+#endif
+}
+
+#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 = Curl_idn_decode(host->name);
+    if(decoded) {
+      /* successful */
+      host->encalloc = decoded;
+      /* change the name pointer to point to the encoded hostname */
+      host->name = host->encalloc;
+    }
+    else
+      return CURLE_URL_MALFORMAT;
+  }
+#endif
+  return CURLE_OK;
+}
+