1 files changed, 42 insertions, 21 deletions

diff --git a/src/lib/libc/net/res_comp.c b/src/lib/libc/net/res_comp.c
index 9d7bbecdda..2d81327aaf 100644
--- a/src/lib/libc/net/res_comp.c
+++ b/src/lib/libc/net/res_comp.c
@@ -1,4 +1,4 @@
-/*      $NetBSD: res_comp.c,v 1.6 1995/02/25 06:20:55 cgd Exp $ */
+/*      $NetBSD: res_comp.c,v 1.7 1996/02/02 15:22:26 mrg Exp $ */
 
 /*-
  * Copyright (c) 1985, 1993
@@ -56,9 +56,9 @@
 #if defined(LIBC_SCCS) && !defined(lint)
 #if 0
 static char sccsid[] = "@(#)res_comp.c  8.1 (Berkeley) 6/4/93";
-static char rcsid[] = "$Id: res_comp.c,v 4.9.1.1 1993/05/02 22:43:03 vixie Rel ";
+static char rcsid[] = "$Id: res_comp.c,v 8.3 1995/12/06 20:34:50 vixie Exp ";
 #else
-static char rcsid[] = "$NetBSD: res_comp.c,v 1.6 1995/02/25 06:20:55 cgd Exp $";
+static char rcsid[] = "$NetBSD: res_comp.c,v 1.7 1996/02/02 15:22:26 mrg Exp $";
 #endif
 #endif /* LIBC_SCCS and not lint */
 
@@ -67,8 +67,11 @@ static char rcsid[] = "$NetBSD: res_comp.c,v 1.6 1995/02/25 06:20:55 cgd Exp $";
 #include <netinet/in.h>
 #include <resolv.h>
 #include <stdio.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <string.h>
 
-static int dn_find();
+static int dn_find __P((u_char *, u_char *, u_char **, u_char **));
 
 /*
  * Expand compressed domain name 'comp_dn' to full domain name.
@@ -77,18 +80,20 @@ static int dn_find();
  * 'exp_dn' is a pointer to a buffer of size 'length' for the result.
  * Return size of compressed name or -1 if there was an error.
  */
+int
 dn_expand(msg, eomorig, comp_dn, exp_dn, length)
         const u_char *msg, *eomorig, *comp_dn;
-        u_char *exp_dn;
+        char *exp_dn;
         int length;
 {
-        register u_char *cp, *dn;
+        register const u_char *cp;
+        register char *dn;
         register int n, c;
-        u_char *eom;
+        char *eom;
         int len = -1, checked = 0;
 
         dn = exp_dn;
-        cp = (u_char *)comp_dn;
+        cp = comp_dn;
         eom = exp_dn + length;
         /*
          * fetch next label in domain name
@@ -108,23 +113,23 @@ dn_expand(msg, eomorig, comp_dn, exp_dn, length)
                                 return (-1);
                         checked += n + 1;
                         while (--n >= 0) {
-                                if ((c = *cp++) == '.') {
+                                if ((c = *cp++) == '.' || c == '\\') {
                                         if (dn + n + 2 >= eom)
                                                 return (-1);
                                         *dn++ = '\\';
                                 }
                                 *dn++ = c;
                                 if (cp >= eomorig)      /* out of range */
-                                        return(-1);
+                                        return (-1);
                         }
                         break;
 
                 case INDIR_MASK:
                         if (len < 0)
                                 len = cp - comp_dn + 1;
-                        cp = (u_char *)msg + (((n & 0x3f) << 8) | (*cp & 0xff));
+                        cp = msg + (((n & 0x3f) << 8) | (*cp & 0xff));
                         if (cp < msg || cp >= eomorig)  /* out of range */
-                                return(-1);
+                                return (-1);
                         checked += 2;
                         /*
                          * Check for loops in the compressed name;
@@ -140,6 +145,9 @@ dn_expand(msg, eomorig, comp_dn, exp_dn, length)
                 }
         }
         *dn = '\0';
+        for (dn = exp_dn; (c = *dn) != '\0'; dn++)
+                if (isascii(c) && isspace(c))
+                        return (-1);
         if (len < 0)
                 len = cp - comp_dn;
         return (len);
@@ -157,8 +165,9 @@ dn_expand(msg, eomorig, comp_dn, exp_dn, length)
  * If 'dnptr' is NULL, we don't try to compress names. If 'lastdnptr'
  * is NULL, we don't update the list.
  */
+int
 dn_comp(exp_dn, comp_dn, length, dnptrs, lastdnptr)
-        const u_char *exp_dn;
+        const char *exp_dn;
         u_char *comp_dn, **dnptrs, **lastdnptr;
         int length;
 {
@@ -170,6 +179,7 @@ dn_comp(exp_dn, comp_dn, length, dnptrs, lastdnptr)
         dn = (u_char *)exp_dn;
         cp = comp_dn;
         eob = cp + length;
+        lpp = cpp = NULL;
         if (dnptrs != NULL) {
                 if ((msg = *dnptrs++) != NULL) {
                         for (cpp = dnptrs; *cpp != NULL; cpp++)
@@ -235,13 +245,14 @@ dn_comp(exp_dn, comp_dn, length, dnptrs, lastdnptr)
 /*
  * Skip over a compressed domain name. Return the size or -1.
  */
+int
 __dn_skipname(comp_dn, eom)
         const u_char *comp_dn, *eom;
 {
-        register u_char *cp;
+        register const u_char *cp;
         register int n;
 
-        cp = (u_char *)comp_dn;
+        cp = comp_dn;
         while (cp < eom && (n = *cp++)) {
                 /*
                  * check for indirection
@@ -263,6 +274,15 @@ __dn_skipname(comp_dn, eom)
         return (cp - comp_dn);
 }
 
+static int
+mklower(ch)
+        register int ch;
+{
+        if (isascii(ch) && isupper(ch))
+                return (tolower(ch));
+        return (ch);
+}
+
 /*
  * Search for expanded name from a list of previously compressed names.
  * Return the offset from msg if found or -1.
@@ -292,7 +312,7 @@ dn_find(exp_dn, msg, dnptrs, lastdnptr)
                                                 goto next;
                                         if (*dn == '\\')
                                                 dn++;
-                                        if (*dn++ != *cp++)
+                                        if (mklower(*dn++) != mklower(*cp++))
                                                 goto next;
                                 }
                                 if ((n = *dn++) == '\0' && *cp == '\0')
@@ -301,11 +321,12 @@ dn_find(exp_dn, msg, dnptrs, lastdnptr)
                                         continue;
                                 goto next;
 
-                        default:        /* illegal type */
-                                return (-1);
-
                         case INDIR_MASK:        /* indirection */
                                 cp = msg + (((n & 0x3f) << 8) | *cp);
+                                break;
+
+                        default:        /* illegal type */
+                                return (-1);
                         }
                 }
                 if (*dn == '\0')
@@ -325,7 +346,7 @@ dn_find(exp_dn, msg, dnptrs, lastdnptr)
 
 u_short
 _getshort(msgp)
-        register u_char *msgp;
+        register const u_char *msgp;
 {
         register u_int16_t u;
 
@@ -335,7 +356,7 @@ _getshort(msgp)
 
 u_int32_t
 _getlong(msgp)
-        register u_char *msgp;
+        register const u_char *msgp;
 {
         register u_int32_t u;