1 files changed, 80 insertions, 0 deletions
diff --git a/kerberosIV/krb/krb_equiv.c b/kerberosIV/krb/krb_equiv.c
new file mode 100644
index 00000000000..0cc13a61a84
--- /dev/null
+++ b/kerberosIV/krb/krb_equiv.c
@@ -0,0 +1,80 @@
+/*
+ * int krb_equiv(u_int32_t ipaddr_a, u_int32_t ipaddr_b);
+ *
+ * Given two IP adresses return true if they match
+ * or are considered to belong to the same host.
+ *
+ * For example if /etc/krb.equiv looks like
+ *
+ *    130.237.223.3   192.16.126.3    # alv alv1
+ *    130.237.223.4   192.16.126.4    # byse byse1
+ *    130.237.228.152 192.16.126.9    # topsy topsy1
+ *
+ * krb_equiv(alv, alv1) would return true but
+ * krb_equiv(alv, byse1) would not.
+ *
+ * A comment starts with an '#' and ends with '\n'.
+ *
+ */
+#include "krb_locl.h"
+
+int
+krb_equiv(a, b)
+	u_int32_t a;
+	u_int32_t b;
+{
+#ifdef NO_IPADDR_CHECK
+  return 1;
+#else
+
+  FILE *fil;
+  int result = 0;
+  char line[256];
+  
+  if (a == b)			/* trivial match */
+    return 1;
+  
+  fil = fopen(KRB_EQUIV, "r");
+  if (fil == NULL)		/* open failed */
+    return 0;
+  
+  while (fgets(line, sizeof(line)-1, fil) != NULL) /* for each line */
+    {
+      int hit_a = 0, hit_b = 0;
+      char *t = line;
+      
+      /* for each item on this line */
+      while (*t != 0)		/* more addresses on this line? */
+	if (*t == '#')		/* rest is comment */
+	  *t = 0;
+	else if (isspace(*t))	/* skip space */
+	  t++;
+	else if (isdigit(*t))	/* an address? */
+	  {
+	    u_int32_t tmp = inet_addr(t);
+	    if (tmp == -1)
+	      ;			/* not an address (or broadcast) */
+	    else if (tmp == a)
+	      hit_a = 1;
+	    else if (tmp == b)
+	      hit_b = 1;
+	    
+	    while (*t == '.' || isdigit(*t)) /* done with this address */
+	      t++;
+	  }
+	else
+	  *t = 0;		/* garbage on this line, skip it */
+
+      /* line is now parsed, if we found 2 matches were done */
+      if (hit_a && hit_b)
+	{
+	  result = 1;
+	  goto done;
+	}
+    }
+
+ done:
+  fclose(fil);
+  return result;
+#endif /* !NO_IPADDR_CHECK */
+}