src/journal/pcre2-dlopen.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include "alloc-util.h"
   4 #include "dlfcn-util.h"
   5 #include "pcre2-dlopen.h"
   6
   7 #if HAVE_PCRE2
   8 static void *pcre2_dl = NULL;
   9
  10 pcre2_match_data* (*sym_pcre2_match_data_create)(uint32_t, pcre2_general_context *);
  11 void (*sym_pcre2_match_data_free)(pcre2_match_data *);
  12 void (*sym_pcre2_code_free)(pcre2_code *);
  13 pcre2_code* (*sym_pcre2_compile)(PCRE2_SPTR, PCRE2_SIZE, uint32_t, int *, PCRE2_SIZE *, pcre2_compile_context *);
  14 int (*sym_pcre2_get_error_message)(int, PCRE2_UCHAR *, PCRE2_SIZE);
  15 int (*sym_pcre2_match)(const pcre2_code *, PCRE2_SPTR, PCRE2_SIZE, PCRE2_SIZE, uint32_t, pcre2_match_data *, pcre2_match_context *);
  16 PCRE2_SIZE* (*sym_pcre2_get_ovector_pointer)(pcre2_match_data *);
  17
  18 int dlopen_pcre2(void) {
  19         _cleanup_(dlclosep) void *dl = NULL;
  20         int r;
  21
  22         if (pcre2_dl)
  23                 return 0; /* Already loaded */
  24
  25         dl = dlopen("libpcre2-8.so.0", RTLD_LAZY);
  26         if (!dl)
  27                 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
  28                                        "PCRE2 support is not installed: %s", dlerror());
  29
  30         r = dlsym_many_and_warn(
  31                         dl,
  32                         LOG_ERR,
  33                         &sym_pcre2_match_data_create, "pcre2_match_data_create_8",
  34                         &sym_pcre2_match_data_free, "pcre2_match_data_free_8",
  35                         &sym_pcre2_code_free, "pcre2_code_free_8",
  36                         &sym_pcre2_compile, "pcre2_compile_8",
  37                         &sym_pcre2_get_error_message, "pcre2_get_error_message_8",
  38                         &sym_pcre2_match, "pcre2_match_8",
  39                         &sym_pcre2_get_ovector_pointer, "pcre2_get_ovector_pointer_8",
  40                         NULL);
  41         if (r < 0)
  42                 return r;
  43
  44         /* Note that we never release the reference here, because there's no real reason to, after all this
  45          * was traditionally a regular shared library dependency which lives forever too. */
  46         pcre2_dl = TAKE_PTR(dl);
  47
  48         return 1;
  49 }
  50
  51 #else
  52
  53 int dlopen_pcre2(void) {
  54         return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
  55                                "PCRE2 support is not compiled in.");
  56 }
  57 #endif