examples/example5.c

   1 /* example5.c --- Example TLD checking.
   2  * Copyright (C) 2004, 2005, 2006, 2007  Simon Josefsson
   3  *
   4  * This file is part of GNU Libidn.
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 /* Get stringprep_locale_charset, etc. */
  26 #include <stringprep.h>
  27
  28 /* Get idna_to_ascii_8z, etc. */
  29 #include <idna.h>
  30
  31 /* Get tld_check_4z. */
  32 #include <tld.h>
  33
  34 /*
  35  * Compiling using libtool and pkg-config is recommended:
  36  *
  37  * $ libtool cc -o example5 example5.c `pkg-config --cflags --libs libidn`
  38  * $ ./example5
  39  * Input domain encoded as `UTF-8': fooß.no
  40  * Read string (length 8): 66 6f 6f c3 9f 2e 6e 6f
  41  * ToASCII string (length 8): fooss.no
  42  * ToUnicode string: U+0066 U+006f U+006f U+0073 U+0073 U+002e U+006e U+006f
  43  * Domain accepted by TLD check
  44  *
  45  * $ ./example5
  46  * Input domain encoded as `UTF-8': gr€€n.no
  47  * Read string (length 12): 67 72 e2 82 ac e2 82 ac 6e 2e 6e 6f
  48  * ToASCII string (length 16): xn--grn-l50aa.no
  49  * ToUnicode string: U+0067 U+0072 U+20ac U+20ac U+006e U+002e U+006e U+006f
  50  * Domain rejected by TLD check, Unicode position 2
  51  *
  52  */
  53
  54 int
  55 main (int argc, char *argv[])
  56 {
  57   char buf[BUFSIZ];
  58   char *p;
  59   uint32_t *r;
  60   int rc;
  61   size_t errpos, i;
  62
  63   printf ("Input domain encoded as `%s': ", stringprep_locale_charset ());
  64   fflush (stdout);
  65   fgets (buf, BUFSIZ, stdin);
  66   buf[strlen (buf) - 1] = '\0';
  67
  68   printf ("Read string (length %d): ", strlen (buf));
  69   for (i = 0; i < strlen (buf); i++)
  70     printf ("%02x ", buf[i] & 0xFF);
  71   printf ("\n");
  72
  73   p = stringprep_locale_to_utf8 (buf);
  74   if (p)
  75     {
  76       strcpy (buf, p);
  77       free (p);
  78     }
  79   else
  80     printf ("Could not convert string to UTF-8, continuing anyway...\n");
  81
  82   rc = idna_to_ascii_8z (buf, &p, 0);
  83   if (rc != IDNA_SUCCESS)
  84     {
  85       printf ("idna_to_ascii_8z failed (%d): %s\n", rc, idna_strerror (rc));
  86       return 2;
  87     }
  88
  89   printf ("ToASCII string (length %d): %s\n", strlen (p), p);
  90
  91   rc = idna_to_unicode_8z4z (p, &r, 0);
  92   free (p);
  93   if (rc != IDNA_SUCCESS)
  94     {
  95       printf ("idna_to_unicode_8z4z failed (%d): %s\n",
  96               rc, idna_strerror (rc));
  97       return 2;
  98     }
  99
 100   printf ("ToUnicode string: ");
 101   for (i = 0; r[i]; i++)
 102     printf ("U+%04x ", r[i]);
 103   printf ("\n");
 104
 105   rc = tld_check_4z (r, &errpos, NULL);
 106   free (r);
 107   if (rc == TLD_INVALID)
 108     {
 109       printf ("Domain rejected by TLD check, Unicode position %d\n", errpos);
 110       return 1;
 111     }
 112   else if (rc != TLD_SUCCESS)
 113     {
 114       printf ("tld_check_4z() failed (%d): %s\n", rc, tld_strerror (rc));
 115       return 2;
 116     }
 117
 118   printf ("Domain accepted by TLD check\n");
 119
 120   return 0;
 121 }