mirror of
https://github.com/matrix-construct/construct
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126 lines
4.2 KiB
C
126 lines
4.2 KiB
C
/*
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* include/irc_reslib.h
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*
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*/
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#ifndef _CHARYBDIS_RESLIB_H
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#define _CHARYBDIS_RESLIB_H
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/* Longest hostname we're willing to work with.
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* Due to DNSBLs this is more than HOSTLEN.
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*/
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#define IRCD_RES_HOSTLEN 255
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/* Here we define some values lifted from nameser.h */
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#define NS_NOTIFY_OP 4
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#define NS_INT16SZ 2
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#define NS_IN6ADDRSZ 16
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#define NS_INADDRSZ 4
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#define NS_INT32SZ 4
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#define NS_CMPRSFLGS 0xc0
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#define NS_MAXCDNAME 255
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#define QUERY 0
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#define IQUERY 1
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#define NO_ERRORS 0
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#define SERVFAIL 2
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#define NXDOMAIN 3
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#define NOTIMP 4
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#define REFUSED 5
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#define T_A 1
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#define T_AAAA 28
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#define T_PTR 12
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#define T_CNAME 5
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#define T_NULL 10
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#define C_IN 1
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#define QFIXEDSZ 4
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#define RRFIXEDSZ 10
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#define HFIXEDSZ 12
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typedef struct
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{
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unsigned id :16; /* query identification number */
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#ifdef WORDS_BIGENDIAN
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/* fields in third byte */
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unsigned qr: 1; /* response flag */
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unsigned opcode: 4; /* purpose of message */
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unsigned aa: 1; /* authoritive answer */
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unsigned tc: 1; /* truncated message */
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unsigned rd: 1; /* recursion desired */
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/* fields in fourth byte */
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unsigned ra: 1; /* recursion available */
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unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */
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unsigned ad: 1; /* authentic data from named */
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unsigned cd: 1; /* checking disabled by resolver */
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unsigned rcode :4; /* response code */
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#else
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/* fields in third byte */
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unsigned rd :1; /* recursion desired */
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unsigned tc :1; /* truncated message */
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unsigned aa :1; /* authoritive answer */
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unsigned opcode :4; /* purpose of message */
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unsigned qr :1; /* response flag */
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/* fields in fourth byte */
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unsigned rcode :4; /* response code */
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unsigned cd: 1; /* checking disabled by resolver */
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unsigned ad: 1; /* authentic data from named */
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unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */
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unsigned ra :1; /* recursion available */
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#endif
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/* remaining bytes */
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unsigned qdcount :16; /* number of question entries */
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unsigned ancount :16; /* number of answer entries */
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unsigned nscount :16; /* number of authority entries */
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unsigned arcount :16; /* number of resource entries */
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} HEADER;
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/*
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* Inline versions of get/put short/long. Pointer is advanced.
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*/
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#define IRC_NS_GET16(s, cp) { \
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const unsigned char *t_cp = (const unsigned char *)(cp); \
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(s) = ((uint16_t)t_cp[0] << 8) \
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| ((uint16_t)t_cp[1]) \
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; \
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(cp) += NS_INT16SZ; \
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}
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#define IRC_NS_GET32(l, cp) { \
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const unsigned char *t_cp = (const unsigned char *)(cp); \
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(l) = ((uint32_t)t_cp[0] << 24) \
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| ((uint32_t)t_cp[1] << 16) \
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| ((uint32_t)t_cp[2] << 8) \
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| ((uint32_t)t_cp[3]) \
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; \
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(cp) += NS_INT32SZ; \
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}
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#define IRC_NS_PUT16(s, cp) { \
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uint16_t t_s = (uint16_t)(s); \
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unsigned char *t_cp = (unsigned char *)(cp); \
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*t_cp++ = t_s >> 8; \
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*t_cp = t_s; \
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(cp) += NS_INT16SZ; \
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}
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#define IRC_NS_PUT32(l, cp) { \
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uint32_t t_l = (uint32_t)(l); \
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unsigned char *t_cp = (unsigned char *)(cp); \
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*t_cp++ = t_l >> 24; \
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*t_cp++ = t_l >> 16; \
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*t_cp++ = t_l >> 8; \
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*t_cp = t_l; \
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(cp) += NS_INT32SZ; \
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}
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extern int irc_res_init(void);
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extern int irc_dn_expand(const unsigned char *msg, const unsigned char *eom, const unsigned char *src, char *dst, int dstsiz);
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extern int irc_dn_skipname(const unsigned char *ptr, const unsigned char *eom);
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extern unsigned int irc_ns_get16(const unsigned char *src);
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extern unsigned long irc_ns_get32(const unsigned char *src);
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extern void irc_ns_put16(unsigned int src, unsigned char *dst);
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extern void irc_ns_put32(unsigned long src, unsigned char *dst);
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extern int irc_res_mkquery(const char *dname, int class_, int type, unsigned char *buf, int buflen);
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extern char irc_domain[IRCD_RES_HOSTLEN + 1];
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#endif
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