Adding upstream version 3.2.3+dfsg.upstream/3.2.3+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 279 insertions, 0 deletions

diff --git a/src/main/regex.c b/src/main/regex.c
new file mode 100644
index 0000000..f66414c
--- /dev/null
+++ b/src/main/regex.c
@@ -0,0 +1,279 @@
+/*
+ *   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