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67 #if defined(LIBC_SCCS) && !defined(lint)
68 static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93";
69 static const char rcsid[] = "$Id: res_mkquery.c,v 1.10 2008/12/11 09:59:00 marka Exp $";
70 #endif /* LIBC_SCCS and not lint */
71 #include <sys/cdefs.h>
72 __FBSDID("$FreeBSD$");
74 #include "port_before.h"
75 #include <sys/param.h>
76 #include <netinet/in.h>
77 #include <arpa/nameser.h>
82 #include "port_after.h"
84 /* Options. Leave them on. */
89 extern const char *_res_opcodes[];
92 * Form all types of queries.
93 * Returns the size of the result or -1.
96 res_nmkquery(res_state statp,
97 int op, /*!< opcode of query */
98 const char *dname, /*!< domain name */
99 int class, int type, /*!< class and type of query */
100 const u_char *data, /*!< resource record data */
101 int datalen, /*!< length of data */
102 const u_char *newrr_in, /*!< new rr for modify or append */
103 u_char *buf, /*!< buffer to put query */
104 int buflen) /*!< size of buffer */
109 u_char *dnptrs[20], **dpp, **lastdnptr;
114 if (statp->options & RES_DEBUG)
115 printf(";; res_nmkquery(%s, %s, %s, %s)\n",
116 _res_opcodes[op], dname, p_class(class), p_type(type));
119 * Initialize header fields.
121 if ((buf == NULL) || (buflen < HFIXEDSZ))
123 memset(buf, 0, HFIXEDSZ);
125 statp->id = res_nrandomid(statp);
126 hp->id = htons(statp->id);
128 hp->rd = (statp->options & RES_RECURSE) != 0U;
135 lastdnptr = dnptrs + nitems(dnptrs);
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). */
208 res_nopt(res_state statp,
209 int n0, /*%< current offset in buffer */
210 u_char *buf, /*%< buffer to put query */
211 int buflen, /*%< size of buffer */
212 int anslen) /*%< UDP answer buffer size */
219 if ((statp->options & RES_DEBUG) != 0U)
220 printf(";; res_nopt()\n");
227 if ((ep - cp) < 1 + RRFIXEDSZ)
230 *cp++ = 0; /*%< "." */
231 ns_put16(ns_t_opt, cp); /*%< TYPE */
234 anslen = 0xffff; /* limit to 16bit value */
235 ns_put16(anslen & 0xffff, cp); /*%< CLASS = UDP payload size */
237 *cp++ = NOERROR; /*%< extended RCODE */
238 *cp++ = 0; /*%< EDNS version */
240 if (statp->options & RES_USE_DNSSEC) {
242 if (statp->options & RES_DEBUG)
243 printf(";; res_opt()... ENDS0 DNSSEC\n");
245 flags |= NS_OPT_DNSSEC_OK;
250 ns_put16(0U, cp); /*%< RDLEN */
253 hp->arcount = htons(ntohs(hp->arcount) + 1);
259 * Construct variable data (RDATA) block for OPT psuedo-RR, append it
260 * to the buffer, then update the RDLEN field (previously set to zero by
261 * res_nopt()) with the new RDATA length.
264 res_nopt_rdata(res_state statp,
265 int n0, /*%< current offset in buffer */
266 u_char *buf, /*%< buffer to put query */
267 int buflen, /*%< size of buffer */
268 u_char *rdata, /*%< ptr to start of opt rdata */
269 u_short code, /*%< OPTION-CODE */
270 u_short len, /*%< OPTION-LENGTH */
271 u_char *data) /*%< OPTION_DATA */
273 register u_char *cp, *ep;
276 if ((statp->options & RES_DEBUG) != 0U)
277 printf(";; res_nopt_rdata()\n");
283 if ((ep - cp) < (4 + len))
286 if (rdata < (buf + 2) || rdata >= ep)
295 memcpy(cp, data, len);
299 ns_put16(len, rdata - 2); /* Update RDLEN field */