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-rw-r--r--src/main/regex.c279
1 files changed, 279 insertions, 0 deletions
diff --git a/src/main/regex.c b/src/main/regex.c
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+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+/*
+ * $Id$
+ *
+ * @file main/regex.c
+ * @brief Regular expression functions used by the server library.
+ *
+ * @copyright 2014 The FreeRADIUS server project
+ */
+
+RCSID("$Id$")
+
+#include <freeradius-devel/radiusd.h>
+#include <freeradius-devel/rad_assert.h>
+
+#ifdef HAVE_REGEX
+
+#define REQUEST_DATA_REGEX (0xadbeef00)
+
+typedef struct regcapture {
+#ifdef HAVE_PCRE
+ regex_t *preg; //!< Compiled pattern.
+#endif
+ char const *value; //!< Original string.
+ regmatch_t *rxmatch; //!< Match vectors.
+ size_t nmatch; //!< Number of match vectors.
+} regcapture_t;
+
+/** Adds subcapture values to request data
+ *
+ * Allows use of %{n} expansions.
+ *
+ * @note After calling regex_sub_to_request *preg may no longer be valid and
+ * should be passed to talloc_free.
+ *
+ * @param request Current request.
+ * @param preg Compiled pattern. May be set to NULL if reparented to the regcapture struct.
+ * @param value The original value.
+ * @param rxmatch Pointers into value.
+ * @param nmatch Sizeof rxmatch.
+ */
+void regex_sub_to_request(REQUEST *request, regex_t **preg, char const *value, size_t len,
+ regmatch_t rxmatch[], size_t nmatch)
+{
+ regcapture_t *old_sc, *new_sc; /* lldb doesn't like new *sigh* */
+ char *p;
+
+ /*
+ * Clear out old_sc matches
+ */
+ old_sc = request_data_get(request, request, REQUEST_DATA_REGEX);
+ if (old_sc) {
+ DEBUG4("Clearing %zu old matches", old_sc->nmatch);
+ talloc_free(old_sc);
+ } else {
+ DEBUG4("No old matches");
+ }
+
+ if (nmatch == 0) return;
+
+ rad_assert(preg && *preg);
+ rad_assert(rxmatch);
+
+ DEBUG4("Adding %zu matches", nmatch);
+
+ /*
+ * Add new_sc matches
+ */
+ MEM(new_sc = talloc(request, regcapture_t));
+
+ MEM(new_sc->rxmatch = talloc_memdup(new_sc, rxmatch, sizeof(rxmatch[0]) * nmatch));
+ talloc_set_type(new_sc->rxmatch, regmatch_t[]);
+
+ MEM(p = talloc_array(new_sc, char, len + 1));
+ memcpy(p, value, len);
+ p[len] = '\0';
+ new_sc->value = p;
+ new_sc->nmatch = nmatch;
+
+#ifdef HAVE_PCRE
+ if (!(*preg)->precompiled) {
+ new_sc->preg = talloc_steal(new_sc, *preg);
+ *preg = NULL;
+ } else {
+ new_sc->preg = *preg;
+ }
+#endif
+
+ request_data_add(request, request, REQUEST_DATA_REGEX, new_sc, true);
+}
+
+# ifdef HAVE_PCRE
+/** Extract a subcapture value from the request
+ *
+ * @note This is the PCRE variant of the function.
+ *
+ * @param ctx To allocate subcapture buffer in.
+ * @param out Where to write the subcapture string.
+ * @param request to extract.
+ * @param num Subcapture index (0 for entire match).
+ * @return 0 on success, -1 on notfound.
+ */
+int regex_request_to_sub(TALLOC_CTX *ctx, char **out, REQUEST *request, uint32_t num)
+{
+ regcapture_t *cap;
+ char const *p;
+ int ret;
+
+ cap = request_data_reference(request, request, REQUEST_DATA_REGEX);
+ if (!cap) {
+ RDEBUG4("No subcapture data found");
+ *out = NULL;
+ return -1;
+ }
+
+ ret = pcre_get_substring(cap->value, (int *)cap->rxmatch, (int)cap->nmatch, num, &p);
+ switch (ret) {
+ case PCRE_ERROR_NOMEMORY:
+ MEM(NULL);
+ /* FALL-THROUGH */
+
+ /*
+ * Not finding a substring is fine
+ */
+ case PCRE_ERROR_NOSUBSTRING:
+ RDEBUG4("%i/%zu Not found", num, cap->nmatch);
+ *out = NULL;
+ return -1;
+
+ default:
+ if (ret < 0) {
+ *out = NULL;
+ return -1;
+ }
+
+ /*
+ * Check libpcre really is using our overloaded
+ * malloc/free talloc wrappers.
+ */
+ p = (char *)talloc_get_type_abort(p, uint8_t);
+ talloc_set_type(p, char *);
+ talloc_steal(ctx, p);
+ memcpy(out, &p, sizeof(*out));
+
+ RDEBUG4("%i/%zu Found: %s (%zu)", num, cap->nmatch, p, talloc_array_length(p));
+
+ return 0;
+ }
+}
+
+/** Extract a named subcapture value from the request
+ *
+ * @note This is the PCRE variant of the function.
+ *
+ * @param ctx To allocate subcapture buffer in.
+ * @param out Where to write the subcapture string.
+ * @param request to extract.
+ * @param name of subcapture.
+ * @return 0 on success, -1 on notfound.
+ */
+int regex_request_to_sub_named(TALLOC_CTX *ctx, char **out, REQUEST *request, char const *name)
+{
+ regcapture_t *cap;
+ char const *p;
+ int ret;
+
+ cap = request_data_reference(request, request, REQUEST_DATA_REGEX);
+ if (!cap) {
+ RDEBUG4("No subcapture data found");
+ *out = NULL;
+ return -1;
+ }
+
+ ret = pcre_get_named_substring(cap->preg->compiled, cap->value,
+ (int *)cap->rxmatch, (int)cap->nmatch, name, &p);
+ switch (ret) {
+ case PCRE_ERROR_NOMEMORY:
+ MEM(NULL);
+ /* FALL-THROUGH */
+
+ /*
+ * Not finding a substring is fine
+ */
+ case PCRE_ERROR_NOSUBSTRING:
+ RDEBUG4("No named capture group \"%s\"", name);
+ *out = NULL;
+ return -1;
+
+ default:
+ if (ret < 0) {
+ *out = NULL;
+ return -1;
+ }
+
+ /*
+ * Check libpcre really is using our overloaded
+ * malloc/free talloc wrappers.
+ */
+ p = (char *)talloc_get_type_abort(p, uint8_t);
+ talloc_set_type(p, char *);
+ talloc_steal(ctx, p);
+ memcpy(out, &p, sizeof(*out));
+
+ RDEBUG4("Found \"%s\": %s (%zu)", name, p, talloc_array_length(p));
+
+ return 0;
+ }
+}
+# else
+/** Extract a subcapture value from the request
+ *
+ * @note This is the POSIX variant of the function.
+ *
+ * @param ctx To allocate subcapture buffer in.
+ * @param out Where to write the subcapture string.
+ * @param request to extract.
+ * @param num Subcapture index (0 for entire match).
+ * @return 0 on success, -1 on notfound.
+ */
+int regex_request_to_sub(TALLOC_CTX *ctx, char **out, REQUEST *request, uint32_t num)
+{
+ regcapture_t *cap;
+ char *p;
+ char const *start;
+ size_t len;
+
+ cap = request_data_reference(request, request, REQUEST_DATA_REGEX);
+ if (!cap) {
+ RDEBUG4("No subcapture data found");
+ *out = NULL;
+ return -1;
+ }
+
+ /*
+ * Greater than our capture array
+ *
+ * -1 means no value in this capture group.
+ */
+ if ((num >= cap->nmatch) || (cap->rxmatch[num].rm_eo == -1) || (cap->rxmatch[num].rm_so == -1)) {
+ RDEBUG4("%i/%zu Not found", num, cap->nmatch);
+ *out = NULL;
+ return -1;
+ }
+
+ /*
+ * Sanity checks on the offsets
+ */
+ rad_assert(cap->rxmatch[num].rm_eo <= (regoff_t)talloc_array_length(cap->value));
+ rad_assert(cap->rxmatch[num].rm_so <= (regoff_t)talloc_array_length(cap->value));
+
+ start = cap->value + cap->rxmatch[num].rm_so;
+ len = cap->rxmatch[num].rm_eo - cap->rxmatch[num].rm_so;
+
+ RDEBUG4("%i/%zu Found: %.*s (%zu)", num, cap->nmatch, (int)len, start, len);
+ MEM(p = talloc_array(ctx, char, len + 1));
+ memcpy(p, start, len);
+ p[len] = '\0';
+
+ *out = p;
+
+ return 0;
+}
+# endif
+#endif
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