1 files changed, 152 insertions, 22 deletions

diff --git a/src/lib/libc/net/res_comp.c b/src/lib/libc/net/res_comp.c
index f64a81d7ce..2e98003b85 100644
--- a/src/lib/libc/net/res_comp.c
+++ b/src/lib/libc/net/res_comp.c
@@ -1,7 +1,11 @@
-/*-
+/*      $OpenBSD: res_comp.c,v 1.4 1997/03/13 19:07:35 downsj Exp $     */
+
+/*
+ * ++Copyright++ 1985, 1993
+ * -
  * Copyright (c) 1985, 1993
- *      The Regents of the University of California.  All rights reserved.
- *
+ *    The Regents of the University of California.  All rights reserved.
+ * 
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -12,12 +16,12 @@
  *    documentation and/or other materials provided with the distribution.
  * 3. All advertising materials mentioning features or use of this software
  *    must display the following acknowledgement:
- *      This product includes software developed by the University of
- *      California, Berkeley and its contributors.
+ *      This product includes software developed by the University of
+ *      California, Berkeley and its contributors.
  * 4. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
- *
+ * 
  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
@@ -52,19 +56,28 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: res_comp.c,v 1.3 1996/08/19 08:29:42 tholo Exp $";
+#if 0
+static char sccsid[] = "@(#)res_comp.c  8.1 (Berkeley) 6/4/93";
+static char rcsid[] = "$From: res_comp.c,v 8.11 1996/12/02 09:17:22 vixie Exp $";
+#else
+static char rcsid[] = "$OpenBSD: res_comp.c,v 1.4 1997/03/13 19:07:35 downsj Exp $";
+#endif
 #endif /* LIBC_SCCS and not lint */
 
+#include <sys/types.h>
 #include <sys/param.h>
-#include <arpa/nameser.h>
 #include <netinet/in.h>
-#include <resolv.h>
+#include <arpa/nameser.h>
+
 #include <stdio.h>
+#include <resolv.h>
 #include <ctype.h>
+
 #include <unistd.h>
 #include <string.h>
 
-static int dn_find __P((u_char *, u_char *, u_char **, u_char **));
+static int      dn_find __P((u_char *exp_dn, u_char *msg,
+                             u_char **dnptrs, u_char **lastdnptr));
 
 /*
  * Expand compressed domain name 'comp_dn' to full domain name.
@@ -106,7 +119,7 @@ dn_expand(msg, eomorig, comp_dn, exp_dn, length)
                                 return (-1);
                         checked += n + 1;
                         while (--n >= 0) {
-                                if ((c = *cp++) == '.' || c == '\\') {
+                                if (((c = *cp++) == '.') || (c == '\\')) {
                                         if (dn + n + 2 >= eom)
                                                 return (-1);
                                         *dn++ = '\\';
@@ -138,9 +151,6 @@ 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);
@@ -263,7 +273,7 @@ __dn_skipname(comp_dn, eom)
                 break;
         }
         if (cp > eom)
-                return -1;
+                return (-1);
         return (cp - comp_dn);
 }
 
@@ -330,14 +340,122 @@ dn_find(exp_dn, msg, dnptrs, lastdnptr)
 }
 
 /*
- * Routines to insert/extract short/long's. Must account for byte
- * order and non-alignment problems. This code at least has the
- * advantage of being portable.
- *
- * used by sendmail.
+ * Verify that a domain name uses an acceptable character set.
  */
 
-u_short
+/*
+ * Note the conspicuous absence of ctype macros in these definitions.  On
+ * non-ASCII hosts, we can't depend on string literals or ctype macros to
+ * tell us anything about network-format data.  The rest of the BIND system
+ * is not careful about this, but for some reason, we're doing it right here.
+ */
+#define PERIOD 0x2e
+#define hyphenchar(c) ((c) == 0x2d)
+#define bslashchar(c) ((c) == 0x5c)
+#define periodchar(c) ((c) == PERIOD)
+#define asterchar(c) ((c) == 0x2a)
+#define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
+                   || ((c) >= 0x61 && (c) <= 0x7a))
+#define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
+
+#define borderchar(c) (alphachar(c) || digitchar(c))
+#define middlechar(c) (borderchar(c) || hyphenchar(c))
+#define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
+
+int
+res_hnok(dn)
+        const char *dn;
+{
+        int ppch = '\0', pch = PERIOD, ch = *dn++;
+
+        while (ch != '\0') {
+                int nch = *dn++;
+
+                if (periodchar(ch)) {
+                        NULL;
+                } else if (periodchar(pch)) {
+                        if (!borderchar(ch))
+                                return (0);
+                } else if (periodchar(nch) || nch == '\0') {
+                        if (!borderchar(ch))
+                                return (0);
+                } else {
+                        if (!middlechar(ch))
+                                return (0);
+                }
+                ppch = pch, pch = ch, ch = nch;
+        }
+        return (1);
+}
+
+/*
+ * hostname-like (A, MX, WKS) owners can have "*" as their first label
+ * but must otherwise be as a host name.
+ */
+int
+res_ownok(dn)
+        const char *dn;
+{
+        if (asterchar(dn[0])) {
+                if (periodchar(dn[1]))
+                        return (res_hnok(dn+2));
+                if (dn[1] == '\0')
+                        return (1);
+        }
+        return (res_hnok(dn));
+}
+
+/*
+ * SOA RNAMEs and RP RNAMEs can have any printable character in their first
+ * label, but the rest of the name has to look like a host name.
+ */
+int
+res_mailok(dn)
+        const char *dn;
+{
+        int ch, escaped = 0;
+
+        /* "." is a valid missing representation */
+        if (*dn == '\0')
+                return(1);
+
+        /* otherwise <label>.<hostname> */
+        while ((ch = *dn++) != '\0') {
+                if (!domainchar(ch))
+                        return (0);
+                if (!escaped && periodchar(ch))
+                        break;
+                if (escaped)
+                        escaped = 0;
+                else if (bslashchar(ch))
+                        escaped = 1;
+        }
+        if (periodchar(ch))
+                return (res_hnok(dn));
+        return(0);
+}
+
+/*
+ * This function is quite liberal, since RFC 1034's character sets are only
+ * recommendations.
+ */
+int
+res_dnok(dn)
+        const char *dn;
+{
+        int ch;
+
+        while ((ch = *dn++) != '\0')
+                if (!domainchar(ch))
+                        return (0);
+        return (1);
+}
+
+/*
+ * Routines to insert/extract short/long's.
+ */
+
+u_int16_t
 _getshort(msgp)
         register const u_char *msgp;
 {
@@ -347,6 +465,18 @@ _getshort(msgp)
         return (u);
 }
 
+#ifdef NeXT
+/*
+ * nExt machines have some funky library conventions, which we must maintain.
+ */
+u_int16_t
+res_getshort(msgp)
+        register const u_char *msgp;
+{
+        return (_getshort(msgp));
+}
+#endif
+
 u_int32_t
 _getlong(msgp)
         register const u_char *msgp;
@@ -359,7 +489,7 @@ _getlong(msgp)
 
 void
 #if defined(__STDC__) || defined(__cplusplus)
-__putshort(register u_int16_t s, register u_char *msgp)
+__putshort(register u_int16_t s, register u_char *msgp) /* must match proto */
 #else
 __putshort(s, msgp)
         register u_int16_t s;