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- /*
- * Copyright (c) 1985 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that: (1) source distributions retain this entire copyright
- * notice and comment, and (2) distributions including binaries display
- * the following acknowledgement: ``This product includes software
- * developed by the University of California, Berkeley and its contributors''
- * in the documentation or other materials provided with the distribution
- * and in all advertising materials mentioning features or use of this
- * software. Neither the name of the University nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-
- #if defined(LIBC_SCCS) && !defined(lint)
- static char sccsid[] = "@(#)res_mkquery.c 6.12 (Berkeley) 6/1/90";
- #endif /* LIBC_SCCS and not lint */
-
- #include <stdio.h>
- #include <sys/types.h>
- #include <netinet/in.h>
- #include "config.h"
- #include "sys.h"
- #include "nameser.h"
- #include "resolv.h"
-
- /*
- * Form all types of queries.
- * Returns the size of the result or -1.
- */
- res_mkquery(op, dname, class, type, data, datalen, newrr, buf, buflen)
- int op; /* opcode of query */
- char *dname; /* domain name */
- int class, type; /* class and type of query */
- char *data; /* resource record data */
- int datalen; /* length of data */
- struct rrec *newrr; /* new rr for modify or append */
- char *buf; /* buffer to put query */
- int buflen; /* size of buffer */
- {
- register HEADER *hp;
- register char *cp;
- register int n;
- char *dnptrs[10], **dpp, **lastdnptr;
-
- #ifdef DEBUG
- if (_res.options & RES_DEBUG)
- printf("res_mkquery(%d, %s, %d, %d)\n", op, dname, class, type);
- #endif /*DEBUG*/
- /*
- * Initialize header fields.
- */
- if ((buf == NULL) || (buflen < sizeof(HEADER)))
- return(-1);
- bzero(buf, sizeof(HEADER));
- hp = (HEADER *) buf;
- hp->id = htons(++_res.id);
- hp->opcode = op;
- hp->pr = (_res.options & RES_PRIMARY) != 0;
- hp->rd = (_res.options & RES_RECURSE) != 0;
- hp->rcode = NOERROR;
- cp = buf + sizeof(HEADER);
- buflen -= sizeof(HEADER);
- dpp = dnptrs;
- *dpp++ = buf;
- *dpp++ = NULL;
- lastdnptr = dnptrs + sizeof(dnptrs)/sizeof(dnptrs[0]);
- /*
- * perform opcode specific processing
- */
- switch (op) {
- case QUERY:
- if ((buflen -= QFIXEDSZ) < 0)
- return(-1);
- if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
- return (-1);
- cp += n;
- buflen -= n;
- putshort(type, cp);
- cp += sizeof(u_short);
- putshort(class, cp);
- cp += sizeof(u_short);
- hp->qdcount = htons(1);
- if (op == QUERY || data == NULL)
- break;
- /*
- * Make an additional record for completion domain.
- */
- buflen -= RRFIXEDSZ;
- if ((n = dn_comp(data, cp, buflen, dnptrs, lastdnptr)) < 0)
- return (-1);
- cp += n;
- buflen -= n;
- putshort(T_NULL, cp);
- cp += sizeof(u_short);
- putshort(class, cp);
- cp += sizeof(u_short);
- putlong(0, cp);
- cp += sizeof(u_long);
- putshort(0, cp);
- cp += sizeof(u_short);
- hp->arcount = htons(1);
- break;
-
- case IQUERY:
- /*
- * Initialize answer section
- */
- if (buflen < 1 + RRFIXEDSZ + datalen)
- return (-1);
- *cp++ = '\0'; /* no domain name */
- putshort(type, cp);
- cp += sizeof(u_short);
- putshort(class, cp);
- cp += sizeof(u_short);
- putlong(0, cp);
- cp += sizeof(u_long);
- putshort(datalen, cp);
- cp += sizeof(u_short);
- if (datalen) {
- bcopy(data, cp, datalen);
- cp += datalen;
- }
- hp->ancount = htons(1);
- break;
-
- #ifdef ALLOW_UPDATES
- /*
- * For UPDATEM/UPDATEMA, do UPDATED/UPDATEDA followed by UPDATEA
- * (Record to be modified is followed by its replacement in msg.)
- */
- case UPDATEM:
- case UPDATEMA:
-
- case UPDATED:
- /*
- * The res code for UPDATED and UPDATEDA is the same; user
- * calls them differently: specifies data for UPDATED; server
- * ignores data if specified for UPDATEDA.
- */
- case UPDATEDA:
- buflen -= RRFIXEDSZ + datalen;
- if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
- return (-1);
- cp += n;
- putshort(type, cp);
- cp += sizeof(u_short);
- putshort(class, cp);
- cp += sizeof(u_short);
- putlong(0, cp);
- cp += sizeof(u_long);
- putshort(datalen, cp);
- cp += sizeof(u_short);
- if (datalen) {
- bcopy(data, cp, datalen);
- cp += datalen;
- }
- if ( (op == UPDATED) || (op == UPDATEDA) ) {
- hp->ancount = htons(0);
- break;
- }
- /* Else UPDATEM/UPDATEMA, so drop into code for UPDATEA */
-
- case UPDATEA: /* Add new resource record */
- buflen -= RRFIXEDSZ + datalen;
- if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
- return (-1);
- cp += n;
- putshort(newrr->r_type, cp);
- cp += sizeof(u_short);
- putshort(newrr->r_class, cp);
- cp += sizeof(u_short);
- putlong(0, cp);
- cp += sizeof(u_long);
- putshort(newrr->r_size, cp);
- cp += sizeof(u_short);
- if (newrr->r_size) {
- bcopy(newrr->r_data, cp, newrr->r_size);
- cp += newrr->r_size;
- }
- hp->ancount = htons(0);
- break;
-
- #endif /* ALLOW_UPDATES */
- }
- return (cp - buf);
- }
-