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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "dlfcn-util.h"
#include "log.h"
#include "pcre2-util.h"
#if HAVE_PCRE2
static void *pcre2_dl = NULL;
DLSYM_FUNCTION(pcre2_match_data_create);
DLSYM_FUNCTION(pcre2_match_data_free);
DLSYM_FUNCTION(pcre2_code_free);
DLSYM_FUNCTION(pcre2_compile);
DLSYM_FUNCTION(pcre2_get_error_message);
DLSYM_FUNCTION(pcre2_match);
DLSYM_FUNCTION(pcre2_get_ovector_pointer);
DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(
pcre2_code_hash_ops_free,
pcre2_code,
(void (*)(const pcre2_code *, struct siphash*))trivial_hash_func,
(int (*)(const pcre2_code *, const pcre2_code*))trivial_compare_func,
sym_pcre2_code_free);
#else
const struct hash_ops pcre2_code_hash_ops_free = {};
#endif
int dlopen_pcre2(void) {
#if HAVE_PCRE2
ELF_NOTE_DLOPEN("pcre2",
"Support for regular expressions",
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
"libpcre2-8.so.0");
/* So here's something weird: PCRE2 actually renames the symbols exported by the library via C
* macros, so that the exported symbols carry a suffix "_8" but when used from C the suffix is
* gone. In the argument list below we ignore this mangling. Surprisingly (at least to me), we
* actually get away with that. That's because DLSYM_ARG() useses STRINGIFY() to generate a string
* version of the symbol name, and that resolves the macro mapping implicitly already, so that the
* string actually contains the "_8" suffix already due to that and we don't have to append it
* manually anymore. C is weird. 🤯 */
return dlopen_many_sym_or_warn(
&pcre2_dl, "libpcre2-8.so.0", LOG_ERR,
DLSYM_ARG(pcre2_match_data_create),
DLSYM_ARG(pcre2_match_data_free),
DLSYM_ARG(pcre2_code_free),
DLSYM_ARG(pcre2_compile),
DLSYM_ARG(pcre2_get_error_message),
DLSYM_ARG(pcre2_match),
DLSYM_ARG(pcre2_get_ovector_pointer));
#else
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "PCRE2 support is not compiled in.");
#endif
}
int pattern_compile_and_log(const char *pattern, PatternCompileCase case_, pcre2_code **ret) {
#if HAVE_PCRE2
PCRE2_SIZE erroroffset;
_cleanup_(sym_pcre2_code_freep) pcre2_code *p = NULL;
unsigned flags = 0;
int errorcode, r;
assert(pattern);
r = dlopen_pcre2();
if (r < 0)
return r;
if (case_ == PATTERN_COMPILE_CASE_INSENSITIVE)
flags = PCRE2_CASELESS;
else if (case_ == PATTERN_COMPILE_CASE_AUTO) {
_cleanup_(sym_pcre2_match_data_freep) pcre2_match_data *md = NULL;
bool has_case;
_cleanup_(sym_pcre2_code_freep) pcre2_code *cs = NULL;
md = sym_pcre2_match_data_create(1, NULL);
if (!md)
return log_oom();
r = pattern_compile_and_log("[[:upper:]]", PATTERN_COMPILE_CASE_SENSITIVE, &cs);
if (r < 0)
return r;
r = sym_pcre2_match(cs, (PCRE2_SPTR8) pattern, PCRE2_ZERO_TERMINATED, 0, 0, md, NULL);
has_case = r >= 0;
flags = !has_case * PCRE2_CASELESS;
}
log_debug("Doing case %s matching based on %s",
flags & PCRE2_CASELESS ? "insensitive" : "sensitive",
case_ != PATTERN_COMPILE_CASE_AUTO ? "request" : "pattern casing");
p = sym_pcre2_compile((PCRE2_SPTR8) pattern,
PCRE2_ZERO_TERMINATED, flags, &errorcode, &erroroffset, NULL);
if (!p) {
unsigned char buf[LINE_MAX];
r = sym_pcre2_get_error_message(errorcode, buf, sizeof buf);
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Bad pattern \"%s\": %s", pattern,
r < 0 ? "unknown error" : (char *)buf);
}
if (ret)
*ret = TAKE_PTR(p);
return 0;
#else
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "PCRE2 support is not compiled in.");
#endif
}
int pattern_matches_and_log(pcre2_code *compiled_pattern, const char *message, size_t size, size_t *ret_ovec) {
#if HAVE_PCRE2
_cleanup_(sym_pcre2_match_data_freep) pcre2_match_data *md = NULL;
int r;
assert(compiled_pattern);
assert(message);
/* pattern_compile_and_log() must be called before this function is called and that function already
* dlopens pcre2 so we can assert on it being available here. */
assert(pcre2_dl);
md = sym_pcre2_match_data_create(1, NULL);
if (!md)
return log_oom();
r = sym_pcre2_match(compiled_pattern,
(const unsigned char *)message,
size,
0, /* start at offset 0 in the subject */
0, /* default options */
md,
NULL);
if (r == PCRE2_ERROR_NOMATCH)
return false;
if (r < 0) {
unsigned char buf[LINE_MAX];
r = sym_pcre2_get_error_message(r, buf, sizeof(buf));
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Pattern matching failed: %s",
r < 0 ? "unknown error" : (char*) buf);
}
if (ret_ovec) {
ret_ovec[0] = sym_pcre2_get_ovector_pointer(md)[0];
ret_ovec[1] = sym_pcre2_get_ovector_pointer(md)[1];
}
return true;
#else
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "PCRE2 support is not compiled in.");
#endif
}
void *pattern_free(pcre2_code *p) {
#if HAVE_PCRE2
if (!p)
return NULL;
assert(pcre2_dl);
sym_pcre2_code_free(p);
return NULL;
#else
assert(p == NULL);
return NULL;
#endif
}
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