start of the ykpiv library

2014-06-16 10:22:05 +02:00
parent f19405fdb1
commit 1a42870615
10 changed files with 466 additions and 1 deletions
@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) 2014 Yubico AB
+ * All rights reserved.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Additional permission under GNU GPL version 3 section 7
+ *
+ * If you modify this program, or any covered work, by linking or
+ * combining it with the OpenSSL project's OpenSSL library (or a
+ * modified version of that library), containing parts covered by the
+ * terms of the OpenSSL or SSLeay licenses, We grant you additional 
+ * permission to convey the resulting work. Corresponding Source for a
+ * non-source form of such a combination shall include the source code
+ * for the parts of OpenSSL used as well as that of the covered work.
+ *
+ */
+
+#include "ykpiv-version.h"
+
+#include <stddef.h>
+
+#include <string.h>
+
+/* From http://article.gmane.org/gmane.os.freebsd.devel.hackers/23606 */
+static int my_strverscmp (const char *s1, const char *s2)
+{
+  static const char *digits = "0123456789";
+  int ret, lz1, lz2;
+  size_t p1, p2;
+
+  p1 = strcspn (s1, digits);
+  p2 = strcspn (s2, digits);
+  while (p1 == p2 && s1[p1] != '\0' && s2[p2] != '\0') {
+    /* Different prefix */
+    if ((ret = strncmp (s1, s2, p1)) != 0)
+      return ret;
+
+    s1 += p1;
+    s2 += p2;
+
+    lz1 = lz2 = 0;
+    if (*s1 == '0')
+      lz1 = 1;
+    if (*s2 == '0')
+      lz2 = 1;
+
+    if (lz1 > lz2)
+      return -1;
+    else if (lz1 < lz2)
+      return 1;
+    else if (lz1 == 1) {
+      /*
+       * If the common prefix for s1 and s2 consists only of zeros, then the
+       * "longer" number has to compare less. Otherwise the comparison needs
+       * to be numerical (just fallthrough). See
+       * http://refspecs.freestandards.org/LSB_2.0.1/LSB-generic/
+       *                                 LSB-generic/baselib-strverscmp.html
+       */
+      while (*s1 == '0' && *s2 == '0') {
+	++s1;
+	++s2;
+      }
+
+      p1 = strspn (s1, digits);
+      p2 = strspn (s2, digits);
+
+      /* Catch empty strings */
+      if (p1 == 0 && p2 > 0)
+	return 1;
+      else if (p2 == 0 && p1 > 0)
+	return -1;
+
+      /* Prefixes are not same */
+      if (*s1 != *s2 && *s1 != '0' && *s2 != '0') {
+	if (p1 < p2)
+	  return 1;
+	else if (p1 > p2)
+	  return -1;
+      } else {
+	if (p1 < p2)
+	  ret = strncmp (s1, s2, p1);
+	else if (p1 > p2)
+	  ret = strncmp (s1, s2, p2);
+	if (ret != 0)
+	  return ret;
+      }
+    }
+
+    p1 = strspn (s1, digits);
+    p2 = strspn (s2, digits);
+
+    if (p1 < p2)
+      return -1;
+    else if (p1 > p2)
+      return 1;
+    else if ((ret = strncmp (s1, s2, p1)) != 0)
+      return ret;
+
+    /* Numbers are equal or not present, try with next ones. */
+    s1 += p1;
+    s2 += p2;
+    p1 = strcspn (s1, digits);
+    p2 = strcspn (s2, digits);
+  }
+
+  return strcmp (s1, s2);
+}
+
+/**
+ * ykpiv_check_version:
+ * @req_version: Required version number, or NULL.
+ *
+ * Check that the version of the library is at minimum the requested
+ * one and return the version string; return NULL if the condition is
+ * not satisfied.  If a NULL is passed to this function, no check is
+ * done, but the version string is simply returned.
+ *
+ * See %YKPIV_VERSION_STRING for a suitable @req_version string.
+ *
+ * Return value: Version string of run-time library, or NULL if the
+ * run-time library does not meet the required version number.
+ */
+const char * ykpiv_check_version (const char *req_version)
+{
+  if (!req_version
+      || my_strverscmp (req_version, YKPIV_VERSION_STRING) <= 0)
+    return YKPIV_VERSION_STRING;
+
+  return NULL;
+}