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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /resolv/res_mkquery.c
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+/*
+ * ++Copyright++ 1985, 1993
+ * -
+ * Copyright (c) 1985, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * -
+ * Portions Copyright (c) 1993 by Digital Equipment Corporation.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies, and that
+ * the name of Digital Equipment Corporation not be used in advertising or
+ * publicity pertaining to distribution of the document or software without
+ * specific, written prior permission.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
+ * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ * -
+ * --Copyright--
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
+static char rcsid[] = "$Id$";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/param.h>
+#include <netinet/in.h>
+#include <arpa/nameser.h>
+
+#include <stdio.h>
+#include <resolv.h>
+#if defined(BSD) && (BSD >= 199103)
+# include <string.h>
+#else
+# include "../conf/portability.h"
+#endif
+
+#if defined(USE_OPTIONS_H)
+# include <../conf/options.h>
+#endif
+
+/*
+ * Form all types of queries.
+ * Returns the size of the result or -1.
+ */
+int
+res_mkquery(op, dname, class, type, data, datalen, newrr_in, buf, buflen)
+ int op; /* opcode of query */
+ const char *dname; /* domain name */
+ int class, type; /* class and type of query */
+ const u_char *data; /* resource record data */
+ int datalen; /* length of data */
+ const u_char *newrr_in; /* new rr for modify or append */
+ u_char *buf; /* buffer to put query */
+ int buflen; /* size of buffer */
+{
+ register HEADER *hp;
+ register u_char *cp;
+ register int n;
+ struct rrec *newrr = (struct rrec *) newrr_in;
+ u_char *dnptrs[20], **dpp, **lastdnptr;
+
+#ifdef DEBUG
+ if (_res.options & RES_DEBUG)
+ printf(";; res_mkquery(%d, %s, %d, %d)\n",
+ op, dname, class, type);
+#endif
+ if (!(_res.options & RES_INIT)) {
+ if (res_init() == -1)
+ return (-1);
+ }
+ /*
+ * Initialize header fields.
+ */
+ if ((buf == NULL) || (buflen < HFIXEDSZ))
+ return (-1);
+ bzero(buf, HFIXEDSZ);
+ 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 + HFIXEDSZ;
+ buflen -= HFIXEDSZ;
+ dpp = dnptrs;
+ *dpp++ = buf;
+ *dpp++ = NULL;
+ lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
+ /*
+ * perform opcode specific processing
+ */
+ switch (op) {
+ case QUERY: /*FALLTHROUGH*/
+ case NS_NOTIFY_OP:
+ 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 += INT16SZ;
+ __putshort(class, cp);
+ cp += INT16SZ;
+ hp->qdcount = htons(1);
+ if (op == QUERY || data == NULL)
+ break;
+ /*
+ * Make an additional record for completion domain.
+ */
+ buflen -= RRFIXEDSZ;
+ n = dn_comp((char *)data, cp, buflen, dnptrs, lastdnptr);
+ if (n < 0)
+ return (-1);
+ cp += n;
+ buflen -= n;
+ __putshort(T_NULL, cp);
+ cp += INT16SZ;
+ __putshort(class, cp);
+ cp += INT16SZ;
+ __putlong(0, cp);
+ cp += INT32SZ;
+ __putshort(0, cp);
+ cp += INT16SZ;
+ 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 += INT16SZ;
+ __putshort(class, cp);
+ cp += INT16SZ;
+ __putlong(0, cp);
+ cp += INT32SZ;
+ __putshort(datalen, cp);
+ cp += INT16SZ;
+ 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 += INT16SZ;
+ __putshort(class, cp);
+ cp += INT16SZ;
+ __putlong(0, cp);
+ cp += INT32SZ;
+ __putshort(datalen, cp);
+ cp += INT16SZ;
+ 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 += INT16SZ;
+ __putshort(newrr->r_class, cp);
+ cp += INT16SZ;
+ __putlong(0, cp);
+ cp += INT32SZ;
+ __putshort(newrr->r_size, cp);
+ cp += INT16SZ;
+ if (newrr->r_size) {
+ bcopy(newrr->r_data, cp, newrr->r_size);
+ cp += newrr->r_size;
+ }
+ hp->ancount = htons(0);
+ break;
+#endif /* ALLOW_UPDATES */
+ default:
+ return (-1);
+ }
+ return (cp - buf);
+}