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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
commit55944e5e40b1be2afc4855d8d2baf4b73d1876b5 (patch)
tree33f869f55a1b149e9b7c2b7e201867ca5dd52992 /src/shared/pcre2-util.c
parentInitial commit. (diff)
downloadsystemd-55944e5e40b1be2afc4855d8d2baf4b73d1876b5.tar.xz
systemd-55944e5e40b1be2afc4855d8d2baf4b73d1876b5.zip
Adding upstream version 255.4.upstream/255.4
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/shared/pcre2-util.c')
-rw-r--r--src/shared/pcre2-util.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/src/shared/pcre2-util.c b/src/shared/pcre2-util.c
new file mode 100644
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+++ b/src/shared/pcre2-util.c
@@ -0,0 +1,166 @@
+/* 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;
+
+pcre2_match_data* (*sym_pcre2_match_data_create)(uint32_t, pcre2_general_context *);
+void (*sym_pcre2_match_data_free)(pcre2_match_data *);
+void (*sym_pcre2_code_free)(pcre2_code *);
+pcre2_code* (*sym_pcre2_compile)(PCRE2_SPTR, PCRE2_SIZE, uint32_t, int *, PCRE2_SIZE *, pcre2_compile_context *);
+int (*sym_pcre2_get_error_message)(int, PCRE2_UCHAR *, PCRE2_SIZE);
+int (*sym_pcre2_match)(const pcre2_code *, PCRE2_SPTR, PCRE2_SIZE, PCRE2_SIZE, uint32_t, pcre2_match_data *, pcre2_match_context *);
+PCRE2_SIZE* (*sym_pcre2_get_ovector_pointer)(pcre2_match_data *);
+
+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
+ /* 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
+}