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/*
* dns/reslib.h
*
* $Id: reslib.h 446 2006-02-12 02:46:54Z db $
*/
#ifndef __MOWGLI_DNS_RESLIB_H__
#define __MOWGLI_DNS_RESLIB_H__
/* Here we define some values lifted from nameser.h */
#define MOWGLI_DNS_NS_NOTIFY_OP 4
#define MOWGLI_DNS_NS_INT16SIZE 2
#define MOWGLI_DNS_NS_IN6ADDRSIZE 16
#define MOWGLI_DNS_NS_INADDRSIZE 4
#define MOWGLI_DNS_NS_INT32SIZE 4
#define MOWGLI_DNS_NS_CMPRSFLAGS 0xc0
#define MOWGLI_DNS_NS_MAXCDNAME 255
#define MOWGLI_DNS_QUERY 0
#define MOWGLI_DNS_IQUERY 1
#define MOWGLI_DNS_NO_ERRORS 0
#define MOWGLI_DNS_SERVFAIL 2
#define MOWGLI_DNS_NXDOMAIN 3
#define MOWGLI_DNS_C_IN 1
#define MOWGLI_DNS_QFIXEDSIZE 4
#define MOWGLI_DNS_RRFIXEDSIZE 10
#define MOWGLI_DNS_HFIXEDSIZE 12
typedef struct
{
unsigned id:16; /* query identification number */
#ifdef WORDS_BIGENDIAN
/* fields in third byte */
unsigned qr:1; /* response flag */
unsigned opcode:4; /* purpose of message */
unsigned aa:1; /* authoritive answer */
unsigned tc:1; /* truncated message */
unsigned rd:1; /* recursion desired */
/* fields in fourth byte */
unsigned ra:1; /* recursion available */
unsigned unused:1; /* unused bits (MBZ as of 4.9.3a3) */
unsigned ad:1; /* authentic data from named */
unsigned cd:1; /* checking disabled by resolver */
unsigned rcode:4; /* response code */
#else
/* fields in third byte */
unsigned rd:1; /* recursion desired */
unsigned tc:1; /* truncated message */
unsigned aa:1; /* authoritive answer */
unsigned opcode:4; /* purpose of message */
unsigned qr:1; /* response flag */
/* fields in fourth byte */
unsigned rcode:4; /* response code */
unsigned cd:1; /* checking disabled by resolver */
unsigned ad:1; /* authentic data from named */
unsigned unused:1; /* unused bits (MBZ as of 4.9.3a3) */
unsigned ra:1; /* recursion available */
#endif
/* remaining bytes */
unsigned qdcount:16; /* number of question entries */
unsigned ancount:16; /* number of answer entries */
unsigned nscount:16; /* number of authority entries */
unsigned arcount:16; /* number of resource entries */
} mowgli_dns_resheader_t;
/*
* Inline versions of get/put short/long. Pointer is advanced.
*/
#define MOWGLI_DNS_NS_GET16(s, cp) { \
const unsigned char *t_cp = (const unsigned char *)(cp); \
(s) = ((uint16_t)t_cp[0] << 8) \
| ((uint16_t)t_cp[1]) \
; \
(cp) += MOWGLI_DNS_NS_INT16SIZE; \
}
#define MOWGLI_DNS_NS_GET32(l, cp) { \
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) += MOWGLI_DNS_NS_INT32SIZE; \
}
#define MOWGLI_DNS_NS_PUT16(s, cp) { \
uint16_t t_s = (uint16_t)(s); \
unsigned char *t_cp = (unsigned char *)(cp); \
*t_cp++ = t_s >> 8; \
*t_cp = t_s; \
(cp) += MOWGLI_DNS_NS_INT16SIZE; \
}
#define MOWGLI_DNS_NS_PUT32(l, cp) { \
uint32_t t_l = (uint32_t)(l); \
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) += MOWGLI_DNS_NS_INT32SIZE; \
}
extern int mowgli_dns_dn_expand(const unsigned char *msg, const unsigned char *eom, const unsigned char *src, char *dst, int dstsiz);
extern int mowgli_dns_dn_skipname(const unsigned char *ptr, const unsigned char *eom);
extern unsigned int mowgli_dns_ns_get16(const unsigned char *src);
extern unsigned long mowgli_dns_ns_get32(const unsigned char *src);
extern void mowgli_dns_ns_put16(unsigned int src, unsigned char *dst);
extern void mowgli_dns_ns_put32(unsigned long src, unsigned char *dst);
extern int mowgli_dns_res_mkquery(const char *dname, int query_class, int type, unsigned char *buf, int buflen);
#endif
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