elemental-ircd/include/reslib.h

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/*
* include/irc_reslib.h
*
* $Id: reslib.h 446 2006-02-12 02:46:54Z db $
*/
#ifndef _CHARYBDIS_RESLIB_H
#define _CHARYBDIS_RESLIB_H
/* Longest hostname we're willing to work with.
* Due to DNSBLs this is more than HOSTLEN.
*/
#define IRCD_RES_HOSTLEN 255
/* Here we define some values lifted from nameser.h */
#define NS_NOTIFY_OP 4
#define NS_INT16SZ 2
#define NS_IN6ADDRSZ 16
#define NS_INADDRSZ 4
#define NS_INT32SZ 4
#define NS_CMPRSFLGS 0xc0
#define NS_MAXCDNAME 255
#define QUERY 0
#define IQUERY 1
#define NO_ERRORS 0
#define SERVFAIL 2
#define NXDOMAIN 3
#define T_A 1
#define T_AAAA 28
#define T_PTR 12
#define T_CNAME 5
#define T_NULL 10
#define C_IN 1
#define QFIXEDSZ 4
#define RRFIXEDSZ 10
#define HFIXEDSZ 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 */
} HEADER;
/*
* Inline versions of get/put short/long. Pointer is advanced.
*/
#define IRC_NS_GET16(s, cp) { \
const unsigned char *t_cp = (const unsigned char *)(cp); \
(s) = ((u_int16_t)t_cp[0] << 8) \
| ((u_int16_t)t_cp[1]) \
; \
(cp) += NS_INT16SZ; \
}
#define IRC_NS_GET32(l, cp) { \
const unsigned char *t_cp = (const unsigned char *)(cp); \
(l) = ((u_int32_t)t_cp[0] << 24) \
| ((u_int32_t)t_cp[1] << 16) \
| ((u_int32_t)t_cp[2] << 8) \
| ((u_int32_t)t_cp[3]) \
; \
(cp) += NS_INT32SZ; \
}
#define IRC_NS_PUT16(s, cp) { \
u_int16_t t_s = (u_int16_t)(s); \
unsigned char *t_cp = (unsigned char *)(cp); \
*t_cp++ = t_s >> 8; \
*t_cp = t_s; \
(cp) += NS_INT16SZ; \
}
#define IRC_NS_PUT32(l, cp) { \
u_int32_t t_l = (u_int32_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) += NS_INT32SZ; \
}
extern int irc_res_init(void);
extern int irc_dn_expand(const unsigned char *msg, const unsigned char *eom, const unsigned char *src, char *dst, int dstsiz);
extern int irc_dn_skipname(const unsigned char *ptr, const unsigned char *eom);
extern unsigned int irc_ns_get16(const unsigned char *src);
extern unsigned long irc_ns_get32(const unsigned char *src);
extern void irc_ns_put16(unsigned int src, unsigned char *dst);
extern void irc_ns_put32(unsigned long src, unsigned char *dst);
extern int irc_res_mkquery(const char *dname, int class, int type, unsigned char *buf, int buflen);
extern char irc_domain[IRCD_RES_HOSTLEN + 1];
#endif