mirror of
https://github.com/matrix-construct/construct
synced 2024-08-24 18:42:16 +02:00
127 lines
4.2 KiB
C
127 lines
4.2 KiB
C
/*
|
|
* include/irc_reslib.h
|
|
*
|
|
*/
|
|
|
|
#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 NOTIMP 4
|
|
#define REFUSED 5
|
|
#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) = ((uint16_t)t_cp[0] << 8) \
|
|
| ((uint16_t)t_cp[1]) \
|
|
; \
|
|
(cp) += NS_INT16SZ; \
|
|
}
|
|
|
|
#define IRC_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) += NS_INT32SZ; \
|
|
}
|
|
|
|
#define IRC_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) += NS_INT16SZ; \
|
|
}
|
|
|
|
#define IRC_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) += 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
|