2 * Copyright (c) 1985, 1993
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33 * @(#)res_mkquery.c 8.1 (Berkeley) 6/4/93
34 * $From: Id: res_mkquery.c,v 8.9 1997/04/24 22:22:36 vixie Exp $
35 * $FreeBSD: src/lib/libc/net/res_mkquery.c,v 1.15.2.2 2002/09/20 10:45:35 nectar Exp $
36 * $DragonFly: src/lib/libcr/net/Attic/res_mkquery.c,v 1.3 2004/10/25 19:38:25 drhodus Exp $
40 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
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55 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
60 * Portions Copyright (c) 1996 by Internet Software Consortium.
62 * Permission to use, copy, modify, and distribute this software for any
63 * purpose with or without fee is hereby granted, provided that the above
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76 #include <sys/types.h>
77 #include <sys/param.h>
78 #include <netinet/in.h>
79 #include <arpa/nameser.h>
85 #include "res_config.h"
88 * Form all types of queries.
89 * Returns the size of the result or -1.
92 res_mkquery(op, dname, class, type, data, datalen, newrr_in, buf, buflen)
93 int op; /* opcode of query */
94 const char *dname; /* domain name */
95 int class, type; /* class and type of query */
96 const u_char *data; /* resource record data */
97 int datalen; /* length of data */
98 const u_char *newrr_in; /* new rr for modify or append */
99 u_char *buf; /* buffer to put query */
100 int buflen; /* size of buffer */
105 u_char *dnptrs[20], **dpp, **lastdnptr;
107 if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
108 h_errno = NETDB_INTERNAL;
112 if (_res.options & RES_DEBUG)
113 printf(";; res_mkquery(%d, %s, %d, %d)\n",
114 op, dname, class, type);
117 * Initialize header fields.
119 if ((buf == NULL) || (buflen < HFIXEDSZ))
121 memset(buf, 0, HFIXEDSZ);
123 hp->id = htons(++_res.id);
125 hp->rd = (_res.options & RES_RECURSE) != 0;
132 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
134 * perform opcode specific processing
137 case QUERY: /*FALLTHROUGH*/
139 if ((buflen -= QFIXEDSZ) < 0)
141 if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
145 __putshort(type, cp);
147 __putshort(class, cp);
149 hp->qdcount = htons(1);
150 if (op == QUERY || data == NULL)
153 * Make an additional record for completion domain.
156 n = dn_comp((char *)data, cp, buflen, dnptrs, lastdnptr);
161 __putshort(T_NULL, cp);
163 __putshort(class, cp);
169 hp->arcount = htons(1);
174 * Initialize answer section
176 if (buflen < 1 + RRFIXEDSZ + datalen)
178 *cp++ = '\0'; /* no domain name */
179 __putshort(type, cp);
181 __putshort(class, cp);
185 __putshort(datalen, cp);
188 memcpy(cp, data, datalen);
191 hp->ancount = htons(1);
201 * Weak aliases for applications that use certain private entry points,
202 * and fail to include <resolv.h>.
205 __weak_reference(__res_mkquery, res_mkquery);
207 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
209 res_opt(n0, buf, buflen, anslen)
211 u_char *buf; /* buffer to put query */
212 int buflen; /* size of buffer */
213 int anslen; /* answer buffer length */
222 if (buflen < 1 + RRFIXEDSZ)
228 __putshort(T_OPT, cp); /* TYPE */
231 anslen = 0xffff; /* limit to 16bit value */
232 __putshort(anslen & 0xffff, cp); /* CLASS = UDP payload size */
234 *cp++ = NOERROR; /* extended RCODE */
235 *cp++ = 0; /* EDNS version */
236 __putshort(0, cp); /* MBZ */
238 __putshort(0, cp); /* RDLEN */
240 hp->arcount = htons(ntohs(hp->arcount) + 1);