?? domain.h
字號:
/* domain.h - dn_cat */
#ifndef NSERVER
#define NSERVER "128.10.3.8:53" /* Server IP address & UDP port */
#endif
/* Definitions of bits in the operation and parameter field */
#define DN_QR 0100000 /* Query (0) or request (1) bit */
#define DN_OPCDE 0074000 /* operation code for query: */
/* 0 => standard query */
/* 1 => inverse query, */
/* 2 => completion query, */
/* 3 => completion (1 answer), */
/* 4-15 => reserved. */
#define DN_AA 0002000 /* 1 if authoritative answer */
#define DN_TR 0001000 /* 1 if message truncated */
#define DN_RD 0000400 /* 1 if recursion desired */
#define DN_RA 0000200 /* 1 if recursion available */
#define DN_RESVD 0000160 /* reserved */
#define DN_RESP 0000017 /* response code: */
/* 0 => no errors in query */
/* 1 => format error in query */
/* 2 => server failure */
/* 3 => name does not exist */
struct dn_mesg { /* domain system message format */
short dn_id; /* message id */
short dn_opparm; /* operation and parmameter bits*/
short dn_qcount; /* # entries in question seciton*/
short dn_acount; /* # RRs in answer section */
short dn_ncount; /* # RRs in nameserver section */
short dn_dcount; /* # RRs in additional section */
char dn_qaaa[1]; /* start of rest of the message */
/* remaining fields of the domain name message are of variable */
/* length, and consist of (1) a question section, (2) an answer */
/* section, (3) an authority section (which says where to find */
/* answers when they cannot be supplied), and (4) an addition */
/* information section. Entries in these are Resource Records. */
};
struct dn_qsuf { /* question section name suffix */
short dn_type; /* type of this name */
short dn_clas; /* class of this name */
};
#define DN_MLEN 128 /* message length (small query) */
#define dn_cat(t,f) {*t++ =(char)strlen(f);strcpy(t,f);t+=strlen(f);}
/* Query type codes */
#define DN_QTHA 1 /* Host address */
#define DN_QTNS 2 /* Authoratative name server */
#define DN_QTMD 3 /* Mail destination (obsolete) */
#define DN_QTMF 4 /* Mail forwarder (obsolete) */
#define DN_QTCN 5 /* Canonical name for an alias */
#define DN_QTSZ 6 /* Start of zone of authority */
#define DN_QTMB 7 /* Mailbox domain name */
#define DN_QTMG 8 /* Mail group member */
#define DN_QTMR 9 /* Mail rename domain name */
#define DN_QTNL 10 /* Null resource record */
#define DN_QTWK 11 /* Well-known service descriptor*/
#define DN_QTPR 12 /* Domain name pointer */
#define DN_QTHI 13 /* Host information */
#define DN_QTMI 14 /* Mailbox or mail list info. */
#define DN_QTMX 15 /* Mail, replaces MD & MF */
/* Query class codes */
#define DN_QCIN 1 /* The DARPA Internet */
#define DN_QCCS 2 /* CSNET (now obsolete) */
#define DN_QCHA 3 /* Chaos network */
#define DN_CMPRS 0300 /* Compressed format is pointer */
#define DN_CPTR 037777 /* Compressed format bits of ptr*/
#define DN_RLEN 10 /* resource record heading len. */
int dnparse(char *, IPaddr *, unsigned short *);
IPaddr dot2ip(const char *);
char *ip2dot(char *, IPaddr);
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