admin, resolve ops bugfix: initialize tag in resop early.

[tripe] / servutil.c

diff --git a/servutil.c b/servutil.c
index 951df2d7e63d3e411adf20e7c2f905a36bb59b15..92a5f775f03b456a0068317508db70294bedcb77 100644 (file)
--- a/servutil.c
+++ b/servutil.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: servutil.c,v 1.1 2001/02/03 20:26:37 mdw Exp $
+ * $Id$
  *
  * Various handy server-only utilities
  *
@@ -26,18 +26,14 @@
  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */
 
-/*----- Revision history --------------------------------------------------* 
- *
- * $Log: servutil.c,v $
- * Revision 1.1  2001/02/03 20:26:37  mdw
- * Initial checkin.
- *
- */
-
 /*----- Header files ------------------------------------------------------*/
 
 #include "tripe.h"
 
+/*----- Global variables --------------------------------------------------*/
+
+octet buf_i[PKBUFSZ], buf_o[PKBUFSZ], buf_t[PKBUFSZ];
+
 /*----- Main code ---------------------------------------------------------*/
 
 /* --- @mpstr@ --- *
@@ -47,14 +43,101 @@
  * Returns:    A pointer to the integer's textual representation.
  *
  * Use:                Converts a multiprecision integer to a string.  Corrupts
- *             @buf_o@.
+ *             @buf_t@.
  */
 
 const char *mpstr(mp *m)
 {
-  if (mp_writestring(m, (char *)buf_o, sizeof(buf_o), 10))
+  if (mp_writestring(m, (char *)buf_t, sizeof(buf_t), 10))
     return ("<failed>");
-  return ((const char *)buf_o);
+  return ((const char *)buf_t);
+}
+
+/* --- @gestr@ --- *
+ *
+ * Arguments:  @group *g@ = a group
+ *             @ge *x@ = a group element
+ *
+ * Returns:    A pointer to the element's textual representation.
+ *
+ * Use:                Converts a group element to a string.  Corrupts
+ *             @buf_t@.
+ */
+
+const char *gestr(group *g, ge *x)
+{
+  if (group_writestring(g, x, (char *)buf_t, sizeof(buf_t)))
+    return ("<failed>");
+  return ((const char *)buf_t);
+}
+
+/* --- @timestr@ --- *
+ *
+ * Arguments:  @time_t t@ = a time to convert
+ *
+ * Returns:    A pointer to a textual representation of the time.
+ *
+ * Use:                Converts a time to a textual representation.  Corrupts
+ *             @buf_t@.
+ */
+
+const char *timestr(time_t t)
+{
+  struct tm *tm;
+  if (!t)
+    return ("NEVER");
+  tm = localtime(&t);
+  strftime((char *)buf_t, sizeof(buf_t), "%Y-%m-%dT%H:%M:%S", tm);
+  return ((const char *)buf_t);
+}
+
+/* --- @seq_reset@ --- *
+ *
+ * Arguments:  @seqwin *s@ = sequence-checking window
+ *
+ * Returns:    ---
+ *
+ * Use:                Resets a sequence number window.
+ */
+
+void seq_reset(seqwin *s) { s->seq = 0; s->win = 0; }
+
+/* --- @seq_check@ --- *
+ *
+ * Arguments:  @seqwin *s@ = sequence-checking window
+ *             @uint32 q@ = sequence number to check
+ *             @const char *service@ = service to report message from
+ *
+ * Returns:    Zero on success, nonzero if the sequence number was bad.
+ *
+ * Use:                Checks a sequence number against the window, updating things
+ *             as necessary.
+ */
+
+int seq_check(seqwin *s, uint32 q, const char *service)
+{
+  uint32 qbit;
+  uint32 n;
+
+  if (q < s->seq) {
+    a_warn(service, "replay", "old-sequence", A_END);
+    return (-1);
+  }
+  if (q >= s->seq + SEQ_WINSZ) {
+    n = q - (s->seq + SEQ_WINSZ - 1);
+    if (n < SEQ_WINSZ)
+      s->win >>= n;
+    else
+      s->win = 0;
+    s->seq += n;
+  }
+  qbit = 1 << (q - s->seq);
+  if (s->win & qbit) {
+    a_warn(service, "replay", "duplicated-sequence", A_END);
+    return (-1);
+  }
+  s->win |= qbit;
+  return (0);
 }
 
 /*----- That's all, folks -------------------------------------------------*/