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37 * Permission to use, copy, modify, and distribute this software for any
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55 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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71 #if defined(LIBC_SCCS) && !defined(lint)
72 static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
73 static const char rcsid[] = "$Id: res_mkquery.c,v 1.1.2.4 2004/03/16 12:35:35 marka Exp $";
74 #endif /* LIBC_SCCS and not lint */
76 #include "port_before.h"
77 #include <sys/types.h>
78 #include <sys/param.h>
79 #include <netinet/in.h>
80 #include <arpa/nameser.h>
85 #include "port_after.h"
87 /* Options. Leave them on. */
90 extern const char *_res_opcodes[];
93 * Form all types of queries.
94 * Returns the size of the result or -1.
97 res_nmkquery(res_state statp,
98 int op, /* opcode of query */
99 const char *dname, /* domain name */
100 int class, int type, /* class and type of query */
101 const u_char *data, /* resource record data */
102 int datalen, /* length of data */
103 const u_char *newrr_in, /* new rr for modify or append */
104 u_char *buf, /* buffer to put query */
105 int buflen) /* size of buffer */
108 register u_char *cp, *ep;
110 u_char *dnptrs[20], **dpp, **lastdnptr;
115 if (statp->options & RES_DEBUG)
116 printf(";; res_nmkquery(%s, %s, %s, %s)\n",
117 _res_opcodes[op], dname, p_class(class), p_type(type));
120 * Initialize header fields.
122 if ((buf == NULL) || (buflen < HFIXEDSZ))
124 memset(buf, 0, HFIXEDSZ);
126 hp->id = htons(++statp->id);
128 hp->rd = (statp->options & RES_RECURSE) != 0U;
135 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
137 * perform opcode specific processing
140 case QUERY: /*FALLTHROUGH*/
142 if (ep - cp < QFIXEDSZ)
144 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
152 hp->qdcount = htons(1);
153 if (op == QUERY || data == NULL)
156 * Make an additional record for completion domain.
158 if ((ep - cp) < RRFIXEDSZ)
160 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,
165 ns_put16(T_NULL, cp);
173 hp->arcount = htons(1);
178 * Initialize answer section
180 if (ep - cp < 1 + RRFIXEDSZ + datalen)
182 *cp++ = '\0'; /* no domain name */
189 ns_put16(datalen, cp);
192 memcpy(cp, data, datalen);
195 hp->ancount = htons(1);
205 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
211 res_nopt(res_state statp,
212 int n0, /* current offset in buffer */
213 u_char *buf, /* buffer to put query */
214 int buflen, /* size of buffer */
215 int anslen) /* UDP answer buffer size */
218 register u_char *cp, *ep;
222 if ((statp->options & RES_DEBUG) != 0U)
223 printf(";; res_nopt()\n");
230 if ((ep - cp) < 1 + RRFIXEDSZ)
235 ns_put16(T_OPT, cp); /* TYPE */
237 ns_put16(anslen & 0xffff, cp); /* CLASS = UDP payload size */
239 *cp++ = NOERROR; /* extended RCODE */
240 *cp++ = 0; /* EDNS version */
241 if (statp->options & RES_USE_DNSSEC) {
243 if (statp->options & RES_DEBUG)
244 printf(";; res_opt()... ENDS0 DNSSEC\n");
246 flags |= NS_OPT_DNSSEC_OK;
250 ns_put16(0, cp); /* RDLEN */
252 hp->arcount = htons(ntohs(hp->arcount) + 1);