src/shared/idn-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #if HAVE_LIBIDN2
   4 #  include <idn2.h>
   5 #elif HAVE_LIBIDN
   6 #  include <idna.h>
   7 #  include <stringprep.h>
   8 #endif
   9
  10 #include "alloc-util.h"
  11 #include "dlfcn-util.h"
  12 #include "idn-util.h"
  13
  14 #if HAVE_LIBIDN || HAVE_LIBIDN2
  15 static void* idn_dl = NULL;
  16 #endif
  17
  18 #if HAVE_LIBIDN2
  19 int (*sym_idn2_lookup_u8)(const uint8_t* src, uint8_t** lookupname, int flags) = NULL;
  20 const char *(*sym_idn2_strerror)(int rc) = NULL;
  21 int (*sym_idn2_to_unicode_8z8z)(const char * input, char ** output, int flags) = NULL;
  22
  23 int dlopen_idn(void) {
  24         _cleanup_(dlclosep) void *dl = NULL;
  25         int r;
  26
  27         if (idn_dl)
  28                 return 0; /* Already loaded */
  29
  30         dl = dlopen("libidn2.so.0", RTLD_LAZY);
  31         if (!dl)
  32                 return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
  33                                        "libidn2 support is not installed: %s", dlerror());
  34
  35         r = dlsym_many_and_warn(
  36                         dl,
  37                         LOG_DEBUG,
  38                         &sym_idn2_lookup_u8, "idn2_lookup_u8",
  39                         &sym_idn2_strerror, "idn2_strerror",
  40                         &sym_idn2_to_unicode_8z8z, "idn2_to_unicode_8z8z",
  41                         NULL);
  42         if (r < 0)
  43                 return r;
  44
  45         /* Note that we never release the reference here, because there's no real reason to, after all this
  46          * was traditionally a regular shared library dependency which lives forever too. */
  47         idn_dl = TAKE_PTR(dl);
  48
  49         return 1;
  50 }
  51 #endif
  52
  53 #if HAVE_LIBIDN
  54 int (*sym_idna_to_ascii_4i)(const uint32_t * in, size_t inlen, char *out, int flags);
  55 int (*sym_idna_to_unicode_44i)(const uint32_t * in, size_t inlen,uint32_t * out, size_t * outlen, int flags);
  56 char* (*sym_stringprep_ucs4_to_utf8)(const uint32_t * str, ssize_t len, size_t * items_read, size_t * items_written);
  57 uint32_t* (*sym_stringprep_utf8_to_ucs4)(const char *str, ssize_t len, size_t *items_written);
  58
  59 int dlopen_idn(void) {
  60         _cleanup_(dlclosep) void *dl = NULL;
  61         int r;
  62
  63         if (idn_dl)
  64                 return 0; /* Already loaded */
  65
  66         dl = dlopen("libidn.so.12", RTLD_LAZY);
  67         if (!dl) {
  68                 /* libidn broke ABI in 1.34, but not in a way we care about (a new field got added to an
  69                  * open-coded struct we do not use), hence support both versions. */
  70                 dl = dlopen("libidn.so.11", RTLD_LAZY);
  71                 if (!dl)
  72                         return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
  73                                                "libidn support is not installed: %s", dlerror());
  74         }
  75
  76         r = dlsym_many_and_warn(
  77                         dl,
  78                         LOG_DEBUG,
  79                         &sym_idna_to_ascii_4i, "idna_to_ascii_4i",
  80                         &sym_idna_to_unicode_44i, "idna_to_unicode_44i",
  81                         &sym_stringprep_ucs4_to_utf8, "stringprep_ucs4_to_utf8",
  82                         &sym_stringprep_utf8_to_ucs4, "stringprep_utf8_to_ucs4",
  83                         NULL);
  84         if (r < 0)
  85                 return r;
  86
  87         idn_dl = TAKE_PTR(dl);
  88
  89         return 1;
  90 }
  91 #endif