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authorRich Felker <dalias@aerifal.cx>2014-12-17 14:40:35 -0500
committerRich Felker <dalias@aerifal.cx>2014-12-17 14:40:35 -0500
commitaac59c116456f8ce617d5b218e7ee4f044f56e6c (patch)
tree617a8c8a94e03de65db4435b649a61e446b3aa6e /include/arpa/nameser.h
parentd42269d7c85308abdbf8cee38b1a1097249eb38b (diff)
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add basic dns record parsing functions
based on patch by Timo Teräs, with some corrections to bounds checking code and other minor changes. while they are borderline scope creep, the functions added are fairly small and are roughly the minimum code needed to use the results of the res_query API without re-implementing error-prone DNS packet parsing, and they are used in practice by some kerberos related software and possibly other things. at this time there is no intent to implement further nameser.h API functions.
Diffstat (limited to 'include/arpa/nameser.h')
-rw-r--r--include/arpa/nameser.h58
1 files changed, 23 insertions, 35 deletions
diff --git a/include/arpa/nameser.h b/include/arpa/nameser.h
index b9ee6659..581925a4 100644
--- a/include/arpa/nameser.h
+++ b/include/arpa/nameser.h
@@ -1,6 +1,11 @@
#ifndef _ARPA_NAMESER_H
#define _ARPA_NAMESER_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stddef.h>
#include <stdint.h>
#define __NAMESER 19991006
@@ -48,6 +53,8 @@ extern const struct _ns_flagdata _ns_flagdata[];
#define ns_msg_end(handle) ((handle)._eom + 0)
#define ns_msg_size(handle) ((handle)._eom - (handle)._msg)
#define ns_msg_count(handle, section) ((handle)._counts[section] + 0)
+#define ns_msg_getflag(handle, flag) \
+ (((handle)._flags & _ns_flagdata[flag].mask) >> _ns_flagdata[flag].shift)
typedef struct __ns_rr {
char name[NS_MAXDNAME];
@@ -296,43 +303,20 @@ typedef enum __ns_cert_types {
#define NS_OPT_DNSSEC_OK 0x8000U
#define NS_OPT_NSID 3
-#define NS_GET16(s, cp) do { \
- register const unsigned char *t_cp = (const unsigned char *)(cp); \
- (s) = ((uint16_t)t_cp[0] << 8) \
- | ((uint16_t)t_cp[1]) \
- ; \
- (cp) += NS_INT16SZ; \
-} while (0)
-
-#define NS_GET32(l, cp) do { \
- register const unsigned char *t_cp = (const unsigned char *)(cp); \
- (l) = ((uint32_t)t_cp[0] << 24) \
- | ((uint32_t)t_cp[1] << 16) \
- | ((uint32_t)t_cp[2] << 8) \
- | ((uint32_t)t_cp[3]) \
- ; \
- (cp) += NS_INT32SZ; \
-} while (0)
-
-#define NS_PUT16(s, cp) do { \
- register uint16_t t_s = (uint16_t)(s); \
- register unsigned char *t_cp = (unsigned char *)(cp); \
- *t_cp++ = t_s >> 8; \
- *t_cp = t_s; \
- (cp) += NS_INT16SZ; \
-} while (0)
-
-#define NS_PUT32(l, cp) do { \
- register uint32_t t_l = (uint32_t)(l); \
- register unsigned char *t_cp = (unsigned char *)(cp); \
- *t_cp++ = t_l >> 24; \
- *t_cp++ = t_l >> 16; \
- *t_cp++ = t_l >> 8; \
- *t_cp = t_l; \
- (cp) += NS_INT32SZ; \
-} while (0)
+#define NS_GET16(s, cp) (void)((s) = ns_get16(((cp)+=2)-2))
+#define NS_GET32(l, cp) (void)((l) = ns_get32(((cp)+=4)-4))
+#define NS_PUT16(s, cp) ns_put16((s), ((cp)+=2)-2)
+#define NS_PUT32(l, cp) ns_put32((l), ((cp)+=4)-4)
+unsigned ns_get16(const unsigned char *);
+unsigned long ns_get32(const unsigned char *);
+void ns_put16(unsigned, unsigned char *);
+void ns_put32(unsigned long, unsigned char *);
+int ns_initparse(const unsigned char *, int, ns_msg *);
+int ns_parserr(ns_msg *, ns_sect, int, ns_rr *);
+int ns_skiprr(const unsigned char *, const unsigned char *, ns_sect, int);
+int ns_name_uncompress(const unsigned char *, const unsigned char *, const unsigned char *, char *, size_t);
#define __BIND 19950621
@@ -464,4 +448,8 @@ typedef struct {
#define PUTSHORT NS_PUT16
#define PUTLONG NS_PUT32
+#ifdef __cplusplus
+}
+#endif
+
#endif