include/reslib.h

   1 /*
   2  * include/irc_reslib.h
   3  *
   4  * $Id: reslib.h 181 2006-12-18 02:56:07Z beu $
   5  */
   6
   7 #ifndef _SEVEN_RESLIB_H
   8 #define _SEVEN_RESLIB_H
   9
  10 /* Here we define some values lifted from nameser.h */
  11 #define NS_NOTIFY_OP 4
  12 #define NS_INT16SZ 2
  13 #define NS_IN6ADDRSZ    16
  14 #define NS_INADDRSZ      4
  15 #define NS_INT32SZ 4
  16 #define NS_CMPRSFLGS    0xc0
  17 #define NS_MAXCDNAME 255
  18 #define QUERY 0
  19 #define IQUERY 1
  20 #define NO_ERRORS 0
  21 #define SERVFAIL 2
  22 #define NXDOMAIN 3
  23 #define T_A 1
  24 #define T_AAAA 28
  25 #define T_PTR 12
  26 #define T_CNAME 5
  27 #define T_NULL 10
  28 #define C_IN 1
  29 #define QFIXEDSZ 4
  30 #define RRFIXEDSZ 10
  31 #define HFIXEDSZ 12
  32
  33 typedef struct
  34 {
  35         unsigned        id :16;         /* query identification number */
  36 #ifdef WORDS_BIGENDIAN
  37                         /* fields in third byte */
  38         unsigned        qr: 1;          /* response flag */
  39         unsigned        opcode: 4;      /* purpose of message */
  40         unsigned        aa: 1;          /* authoritive answer */
  41         unsigned        tc: 1;          /* truncated message */
  42         unsigned        rd: 1;          /* recursion desired */
  43                         /* fields in fourth byte */
  44         unsigned        ra: 1;          /* recursion available */
  45         unsigned        unused :1;      /* unused bits (MBZ as of 4.9.3a3) */
  46         unsigned        ad: 1;          /* authentic data from named */
  47         unsigned        cd: 1;          /* checking disabled by resolver */
  48         unsigned        rcode :4;       /* response code */
  49 #else
  50                         /* fields in third byte */
  51         unsigned        rd :1;          /* recursion desired */
  52         unsigned        tc :1;          /* truncated message */
  53         unsigned        aa :1;          /* authoritive answer */
  54         unsigned        opcode :4;      /* purpose of message */
  55         unsigned        qr :1;          /* response flag */
  56                         /* fields in fourth byte */
  57         unsigned        rcode :4;       /* response code */
  58         unsigned        cd: 1;          /* checking disabled by resolver */
  59         unsigned        ad: 1;          /* authentic data from named */
  60         unsigned        unused :1;      /* unused bits (MBZ as of 4.9.3a3) */
  61         unsigned        ra :1;          /* recursion available */
  62 #endif
  63                         /* remaining bytes */
  64         unsigned        qdcount :16;    /* number of question entries */
  65         unsigned        ancount :16;    /* number of answer entries */
  66         unsigned        nscount :16;    /* number of authority entries */
  67         unsigned        arcount :16;    /* number of resource entries */
  68 } HEADER;
  69
  70 /*
  71  * Inline versions of get/put short/long.  Pointer is advanced.
  72  */
  73 #define IRC_NS_GET16(s, cp) { \
  74         const unsigned char *t_cp = (const unsigned char *)(cp); \
  75         (s) = ((u_int16_t)t_cp[0] << 8) \
  76             | ((u_int16_t)t_cp[1]) \
  77             ; \
  78         (cp) += NS_INT16SZ; \
  79 }
  80
  81 #define IRC_NS_GET32(l, cp) { \
  82         const unsigned char *t_cp = (const unsigned char *)(cp); \
  83         (l) = ((u_int32_t)t_cp[0] << 24) \
  84             | ((u_int32_t)t_cp[1] << 16) \
  85             | ((u_int32_t)t_cp[2] << 8) \
  86             | ((u_int32_t)t_cp[3]) \
  87             ; \
  88         (cp) += NS_INT32SZ; \
  89 }
  90
  91 #define IRC_NS_PUT16(s, cp) { \
  92         u_int16_t t_s = (u_int16_t)(s); \
  93         unsigned char *t_cp = (unsigned char *)(cp); \
  94         *t_cp++ = t_s >> 8; \
  95         *t_cp   = t_s; \
  96         (cp) += NS_INT16SZ; \
  97 }
  98
  99 #define IRC_NS_PUT32(l, cp) { \
 100         u_int32_t t_l = (u_int32_t)(l); \
 101         unsigned char *t_cp = (unsigned char *)(cp); \
 102         *t_cp++ = t_l >> 24; \
 103         *t_cp++ = t_l >> 16; \
 104         *t_cp++ = t_l >> 8; \
 105         *t_cp   = t_l; \
 106         (cp) += NS_INT32SZ; \
 107 }
 108
 109 extern int irc_res_init(void);
 110 extern int irc_dn_expand(const unsigned char *msg, const unsigned char *eom, const unsigned char *src, char *dst, int dstsiz);
 111 extern int irc_dn_skipname(const unsigned char *ptr, const unsigned char *eom);
 112 extern unsigned int irc_ns_get16(const unsigned char *src);
 113 extern unsigned long irc_ns_get32(const unsigned char *src);
 114 extern void irc_ns_put16(unsigned int src, unsigned char *dst);
 115 extern void irc_ns_put32(unsigned long src, unsigned char *dst);
 116 extern int irc_res_mkquery(const char *dname, int class, int type, unsigned char *buf, int buflen);
 117
 118 #endif