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60 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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69 #if defined(LIBC_SCCS) && !defined(lint)
70 static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
71 static const char rcsid[] = "$Id: res_mkquery.c,v 1.10 2008/12/11 09:59:00 marka Exp $";
72 #endif /* LIBC_SCCS and not lint */
73 #include <sys/cdefs.h>
74 __FBSDID("$FreeBSD$");
76 #include "port_before.h"
77 #include <sys/param.h>
78 #include <netinet/in.h>
79 #include <arpa/nameser.h>
84 #include "port_after.h"
86 /* Options. Leave them on. */
91 extern const char *_res_opcodes[];
94 * Form all types of queries.
95 * Returns the size of the result or -1.
98 res_nmkquery(res_state statp,
99 int op, /*!< opcode of query */
100 const char *dname, /*!< domain name */
101 int class, int type, /*!< class and type of query */
102 const u_char *data, /*!< resource record data */
103 int datalen, /*!< length of data */
104 const u_char *newrr_in, /*!< new rr for modify or append */
105 u_char *buf, /*!< buffer to put query */
106 int buflen) /*!< size of buffer */
111 u_char *dnptrs[20], **dpp, **lastdnptr;
116 if (statp->options & RES_DEBUG)
117 printf(";; res_nmkquery(%s, %s, %s, %s)\n",
118 _res_opcodes[op], dname, p_class(class), p_type(type));
121 * Initialize header fields.
123 if ((buf == NULL) || (buflen < HFIXEDSZ))
125 memset(buf, 0, HFIXEDSZ);
127 statp->id = res_nrandomid(statp);
128 hp->id = htons(statp->id);
130 hp->rd = (statp->options & RES_RECURSE) != 0U;
137 lastdnptr = dnptrs + nitems(dnptrs);
139 * perform opcode specific processing
142 case QUERY: /*FALLTHROUGH*/
144 if (ep - cp < QFIXEDSZ)
146 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
154 hp->qdcount = htons(1);
155 if (op == QUERY || data == NULL)
158 * Make an additional record for completion domain.
160 if ((ep - cp) < RRFIXEDSZ)
162 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,
167 ns_put16(T_NULL, cp);
175 hp->arcount = htons(1);
180 * Initialize answer section
182 if (ep - cp < 1 + RRFIXEDSZ + datalen)
184 *cp++ = '\0'; /*%< no domain name */
191 ns_put16(datalen, cp);
194 memcpy(cp, data, datalen);
197 hp->ancount = htons(1);
207 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
210 res_nopt(res_state statp,
211 int n0, /*%< current offset in buffer */
212 u_char *buf, /*%< buffer to put query */
213 int buflen, /*%< size of buffer */
214 int anslen) /*%< UDP answer buffer size */
221 if ((statp->options & RES_DEBUG) != 0U)
222 printf(";; res_nopt()\n");
229 if ((ep - cp) < 1 + RRFIXEDSZ)
232 *cp++ = 0; /*%< "." */
233 ns_put16(ns_t_opt, cp); /*%< TYPE */
236 anslen = 0xffff; /* limit to 16bit value */
237 ns_put16(anslen & 0xffff, cp); /*%< CLASS = UDP payload size */
239 *cp++ = NOERROR; /*%< extended RCODE */
240 *cp++ = 0; /*%< EDNS version */
242 if (statp->options & RES_USE_DNSSEC) {
244 if (statp->options & RES_DEBUG)
245 printf(";; res_opt()... ENDS0 DNSSEC\n");
247 flags |= NS_OPT_DNSSEC_OK;
252 ns_put16(0U, cp); /*%< RDLEN */
255 hp->arcount = htons(ntohs(hp->arcount) + 1);
261 * Construct variable data (RDATA) block for OPT psuedo-RR, append it
262 * to the buffer, then update the RDLEN field (previously set to zero by
263 * res_nopt()) with the new RDATA length.
266 res_nopt_rdata(res_state statp,
267 int n0, /*%< current offset in buffer */
268 u_char *buf, /*%< buffer to put query */
269 int buflen, /*%< size of buffer */
270 u_char *rdata, /*%< ptr to start of opt rdata */
271 u_short code, /*%< OPTION-CODE */
272 u_short len, /*%< OPTION-LENGTH */
273 u_char *data) /*%< OPTION_DATA */
275 register u_char *cp, *ep;
278 if ((statp->options & RES_DEBUG) != 0U)
279 printf(";; res_nopt_rdata()\n");
285 if ((ep - cp) < (4 + len))
288 if (rdata < (buf + 2) || rdata >= ep)
297 memcpy(cp, data, len);
301 ns_put16(len, rdata - 2); /* Update RDLEN field */