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/* |
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* include/irc_reslib.h (C)opyright 1992 Darren Reed. |
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* |
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* $Id$ |
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*/ |
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|
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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 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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|
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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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/* |
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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) = ((u_int16_t)t_cp[0] << 8) \ |
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| ((u_int16_t)t_cp[1]) \ |
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; \ |
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(cp) += NS_INT16SZ; \ |
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} |
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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) = ((u_int32_t)t_cp[0] << 24) \ |
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| ((u_int32_t)t_cp[1] << 16) \ |
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| ((u_int32_t)t_cp[2] << 8) \ |
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| ((u_int32_t)t_cp[3]) \ |
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; \ |
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(cp) += NS_INT32SZ; \ |
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} |
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|
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#define IRC_NS_PUT16(s, cp) { \ |
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u_int16_t t_s = (u_int16_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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|
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#define IRC_NS_PUT32(l, cp) { \ |
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u_int32_t t_l = (u_int32_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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|
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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); |
