1 files changed, 148 insertions, 0 deletions
diff --git a/src/lib/krb5/os/dnsglue.h b/src/lib/krb5/os/dnsglue.h
new file mode 100644
index 0000000..d2d1927
--- /dev/null
+++ b/src/lib/krb5/os/dnsglue.h
@@ -0,0 +1,148 @@
+/*
+ * lib/krb5/os/dnsglue.h
+ *
+ * Copyright 2004 by the Massachusetts Institute of Technology.
+ * All Rights Reserved.
+ *
+ * Export of this software from the United States of America may
+ *   require a specific license from the United States Government.
+ *   It is the responsibility of any person or organization contemplating
+ *   export to obtain such a license before exporting.
+ * 
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ *
+ * Glue layer for DNS resolver, to make parsing of replies easier
+ * whether we are using BIND 4, 8, or 9.
+ */
+
+/*
+ * BIND 4 doesn't have the ns_initparse() API, so we need to do some
+ * manual parsing via the HEADER struct.  BIND 8 does have
+ * ns_initparse(), but has enums for the various protocol constants
+ * rather than the BIND 4 macros.  BIND 9 (at least on Mac OS X
+ * Panther) appears to disable res_nsearch() if BIND_8_COMPAT is
+ * defined (which is necessary to obtain the HEADER struct).
+ *
+ * We use ns_initparse() if available at all, and never define
+ * BIND_8_COMPAT.  If there is no ns_initparse(), we do manual parsing
+ * by using the HEADER struct.
+ */
+
+#ifndef KRB5_DNSGLUE_H
+#define KRB5_DNSGLUE_H
+
+#ifdef KRB5_DNS_LOOKUP
+
+#define NEED_SOCKETS
+#include "k5-int.h"
+#include "os-proto.h"
+#ifdef WSHELPER
+#include <wshelper.h>
+#else /* WSHELPER */
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+#include <resolv.h>
+#include <netdb.h>
+#endif /* WSHELPER */
+
+#if HAVE_SYS_PARAM_H
+#include <sys/param.h>		/* for MAXHOSTNAMELEN */
+#endif
+
+#ifndef MAXHOSTNAMELEN
+#define MAXHOSTNAMELEN 64	/* if we can't find it elswhere */
+#endif
+
+#ifndef MAXDNAME
+
+#ifdef NS_MAXDNAME
+#define MAXDNAME NS_MAXDNAME
+#else
+#ifdef MAXLABEL
+#define MAXDNAME (16 * MAXLABEL)
+#else
+#define MAXDNAME (16 * MAXHOSTNAMELEN)
+#endif
+#endif
+
+#endif
+
+#if HAVE_RES_NSEARCH
+/*
+ * Some BIND 8 / BIND 9 implementations disable the BIND 4 style
+ * constants.
+ */
+#ifndef C_IN
+#define C_IN ns_c_in
+#endif
+#ifndef T_SRV
+#define T_SRV ns_t_srv
+#endif
+#ifndef T_TXT
+#define T_TXT ns_t_txt
+#endif
+
+#else  /* !HAVE_RES_NSEARCH */
+
+/*
+ * Some BIND implementations might be old enough to lack these.
+ */
+#ifndef T_TXT
+#define T_TXT 15
+#endif
+#ifndef T_SRV
+#define T_SRV 33
+#endif
+
+#endif /* HAVE_RES_NSEARCH */
+
+/*
+ * INCR_OK
+ *
+ * Given moving pointer PTR offset from BASE, return true if adding
+ * INCR to PTR doesn't move it PTR than MAX bytes from BASE.
+ */
+#define INCR_OK(base, max, ptr, incr)				\
+    ((incr) <= (max) - ((const unsigned char *)(ptr)		\
+			- (const unsigned char *)(base)))
+
+/*
+ * SAFE_GETUINT16
+ *
+ * Given PTR offset from BASE, if at least INCR bytes are safe to
+ * read, get network byte order uint16 into S, and increment PTR.  On
+ * failure, goto LABEL.
+ */
+
+#define SAFE_GETUINT16(base, max, ptr, incr, s, label)	\
+    do {						\
+	if (!INCR_OK(base, max, ptr, incr)) goto label;	\
+	(s) = (unsigned short)(p)[0] << 8		\
+	    | (unsigned short)(p)[1];			\
+	(p) += (incr);					\
+    } while (0)
+
+struct krb5int_dns_state;
+
+int krb5int_dns_init(struct krb5int_dns_state **, char *, int, int);
+int krb5int_dns_nextans(struct krb5int_dns_state *,
+			const unsigned char **, int *);
+int krb5int_dns_expand(struct krb5int_dns_state *,
+		       const unsigned char *, char *, int);
+void krb5int_dns_fini(struct krb5int_dns_state *);
+
+#endif /* KRB5_DNS_LOOKUP */
+#endif /* !defined(KRB5_DNSGLUE_H) */