include/reslib.h

   1 /*
   2  * include/irc_reslib.h
   3  *
   4  */
   5
   6 #ifndef _CHARYBDIS_RESLIB_H
   7 #define _CHARYBDIS_RESLIB_H
   8
   9 /* Longest hostname we're willing to work with.
  10  * Due to DNSBLs this is more than HOSTLEN.
  11  */
  12 #define IRCD_RES_HOSTLEN 255
  13
  14 /* Here we define some values lifted from nameser.h */
  15 #define NS_NOTIFY_OP 4
  16 #define NS_INT16SZ 2
  17 #define NS_IN6ADDRSZ    16
  18 #define NS_INADDRSZ      4
  19 #define NS_INT32SZ 4
  20 #define NS_CMPRSFLGS    0xc0
  21 #define NS_MAXCDNAME 255
  22 #define QUERY 0
  23 #define IQUERY 1
  24 #define NO_ERRORS 0
  25 #define SERVFAIL 2
  26 #define NXDOMAIN 3
  27 #define T_A 1
  28 #define T_AAAA 28
  29 #define T_PTR 12
  30 #define T_CNAME 5
  31 #define T_NULL 10
  32 #define C_IN 1
  33 #define QFIXEDSZ 4
  34 #define RRFIXEDSZ 10
  35 #define HFIXEDSZ 12
  36
  37 typedef struct
  38 {
  39         unsigned        id :16;         /* query identification number */
  40 #ifdef WORDS_BIGENDIAN
  41                         /* fields in third byte */
  42         unsigned        qr: 1;          /* response flag */
  43         unsigned        opcode: 4;      /* purpose of message */
  44         unsigned        aa: 1;          /* authoritive answer */
  45         unsigned        tc: 1;          /* truncated message */
  46         unsigned        rd: 1;          /* recursion desired */
  47                         /* fields in fourth byte */
  48         unsigned        ra: 1;          /* recursion available */
  49         unsigned        unused :1;      /* unused bits (MBZ as of 4.9.3a3) */
  50         unsigned        ad: 1;          /* authentic data from named */
  51         unsigned        cd: 1;          /* checking disabled by resolver */
  52         unsigned        rcode :4;       /* response code */
  53 #else
  54                         /* fields in third byte */
  55         unsigned        rd :1;          /* recursion desired */
  56         unsigned        tc :1;          /* truncated message */
  57         unsigned        aa :1;          /* authoritive answer */
  58         unsigned        opcode :4;      /* purpose of message */
  59         unsigned        qr :1;          /* response flag */
  60                         /* fields in fourth byte */
  61         unsigned        rcode :4;       /* response code */
  62         unsigned        cd: 1;          /* checking disabled by resolver */
  63         unsigned        ad: 1;          /* authentic data from named */
  64         unsigned        unused :1;      /* unused bits (MBZ as of 4.9.3a3) */
  65         unsigned        ra :1;          /* recursion available */
  66 #endif
  67                         /* remaining bytes */
  68         unsigned        qdcount :16;    /* number of question entries */
  69         unsigned        ancount :16;    /* number of answer entries */
  70         unsigned        nscount :16;    /* number of authority entries */
  71         unsigned        arcount :16;    /* number of resource entries */
  72 } HEADER;
  73
  74 /*
  75  * Inline versions of get/put short/long.  Pointer is advanced.
  76  */
  77 #define IRC_NS_GET16(s, cp) { \
  78         const unsigned char *t_cp = (const unsigned char *)(cp); \
  79         (s) = ((u_int16_t)t_cp[0] << 8) \
  80             | ((u_int16_t)t_cp[1]) \
  81             ; \
  82         (cp) += NS_INT16SZ; \
  83 }
  84
  85 #define IRC_NS_GET32(l, cp) { \
  86         const unsigned char *t_cp = (const unsigned char *)(cp); \
  87         (l) = ((u_int32_t)t_cp[0] << 24) \
  88             | ((u_int32_t)t_cp[1] << 16) \
  89             | ((u_int32_t)t_cp[2] << 8) \
  90             | ((u_int32_t)t_cp[3]) \
  91             ; \
  92         (cp) += NS_INT32SZ; \
  93 }
  94
  95 #define IRC_NS_PUT16(s, cp) { \
  96         u_int16_t t_s = (u_int16_t)(s); \
  97         unsigned char *t_cp = (unsigned char *)(cp); \
  98         *t_cp++ = t_s >> 8; \
  99         *t_cp   = t_s; \
 100         (cp) += NS_INT16SZ; \
 101 }
 102
 103 #define IRC_NS_PUT32(l, cp) { \
 104         u_int32_t t_l = (u_int32_t)(l); \
 105         unsigned char *t_cp = (unsigned char *)(cp); \
 106         *t_cp++ = t_l >> 24; \
 107         *t_cp++ = t_l >> 16; \
 108         *t_cp++ = t_l >> 8; \
 109         *t_cp   = t_l; \
 110         (cp) += NS_INT32SZ; \
 111 }
 112
 113 extern int irc_res_init(void);
 114 extern int irc_dn_expand(const unsigned char *msg, const unsigned char *eom, const unsigned char *src, char *dst, int dstsiz);
 115 extern int irc_dn_skipname(const unsigned char *ptr, const unsigned char *eom);
 116 extern unsigned int irc_ns_get16(const unsigned char *src);
 117 extern unsigned long irc_ns_get32(const unsigned char *src);
 118 extern void irc_ns_put16(unsigned int src, unsigned char *dst);
 119 extern void irc_ns_put32(unsigned long src, unsigned char *dst);
 120 extern int irc_res_mkquery(const char *dname, int class, int type, unsigned char *buf, int buflen);
 121
 122 extern char irc_domain[IRCD_RES_HOSTLEN + 1];
 123
 124 #endif