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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/types.h>
76 #include <sys/param.h>
77 #include <netinet/in.h>
78 #include <arpa/nameser.h>
83 #include "port_after.h"
85 /* 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 */
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 statp->id = res_nrandomid(statp);
127 hp->id = htons(statp->id);
129 hp->rd = (statp->options & RES_RECURSE) != 0U;
136 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
138 * perform opcode specific processing
141 case QUERY: /*FALLTHROUGH*/
143 if (ep - cp < QFIXEDSZ)
145 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
153 hp->qdcount = htons(1);
154 if (op == QUERY || data == NULL)
157 * Make an additional record for completion domain.
159 if ((ep - cp) < RRFIXEDSZ)
161 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,
166 ns_put16(T_NULL, cp);
174 hp->arcount = htons(1);
179 * Initialize answer section
181 if (ep - cp < 1 + RRFIXEDSZ + datalen)
183 *cp++ = '\0'; /*%< no domain name */
190 ns_put16(datalen, cp);
193 memcpy(cp, data, datalen);
196 hp->ancount = htons(1);
206 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
209 res_nopt(res_state statp,
210 int n0, /*%< current offset in buffer */
211 u_char *buf, /*%< buffer to put query */
212 int buflen, /*%< size of buffer */
213 int anslen) /*%< UDP answer buffer size */
220 if ((statp->options & RES_DEBUG) != 0U)
221 printf(";; res_nopt()\n");
228 if ((ep - cp) < 1 + RRFIXEDSZ)
231 *cp++ = 0; /*%< "." */
232 ns_put16(ns_t_opt, cp); /*%< TYPE */
235 anslen = 0xffff; /* limit to 16bit value */
236 ns_put16(anslen & 0xffff, cp); /*%< CLASS = UDP payload size */
238 *cp++ = NOERROR; /*%< extended RCODE */
239 *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;
251 ns_put16(0U, cp); /*%< RDLEN */
254 hp->arcount = htons(ntohs(hp->arcount) + 1);
260 * Construct variable data (RDATA) block for OPT psuedo-RR, append it
261 * to the buffer, then update the RDLEN field (previously set to zero by
262 * res_nopt()) with the new RDATA length.
265 res_nopt_rdata(res_state statp,
266 int n0, /*%< current offset in buffer */
267 u_char *buf, /*%< buffer to put query */
268 int buflen, /*%< size of buffer */
269 u_char *rdata, /*%< ptr to start of opt rdata */
270 u_short code, /*%< OPTION-CODE */
271 u_short len, /*%< OPTION-LENGTH */
272 u_char *data) /*%< OPTION_DATA */
274 register u_char *cp, *ep;
277 if ((statp->options & RES_DEBUG) != 0U)
278 printf(";; res_nopt_rdata()\n");
284 if ((ep - cp) < (4 + len))
287 if (rdata < (buf + 2) || rdata >= ep)
296 memcpy(cp, data, len);
300 ns_put16(len, rdata - 2); /* Update RDLEN field */