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60 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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69 #include "port_before.h"
70 #include <sys/param.h>
71 #include <netinet/in.h>
72 #include <arpa/nameser.h>
77 #include "port_after.h"
79 /* Options. Leave them on. */
84 extern const char *_res_opcodes[];
87 * Form all types of queries.
88 * Returns the size of the result or -1.
91 res_nmkquery(res_state statp,
92 int op, /*!< opcode of query */
93 const char *dname, /*!< domain name */
94 int class, int type, /*!< class and type of query */
95 const u_char *data, /*!< resource record data */
96 int datalen, /*!< length of data */
97 const u_char *newrr_in, /*!< new rr for modify or append */
98 u_char *buf, /*!< buffer to put query */
99 int buflen) /*!< size of buffer */
104 u_char *dnptrs[20], **dpp, **lastdnptr;
109 if (statp->options & RES_DEBUG)
110 printf(";; res_nmkquery(%s, %s, %s, %s)\n",
111 _res_opcodes[op], dname, p_class(class), p_type(type));
114 * Initialize header fields.
116 if ((buf == NULL) || (buflen < HFIXEDSZ))
118 memset(buf, 0, HFIXEDSZ);
120 statp->id = res_nrandomid(statp);
121 hp->id = htons(statp->id);
123 hp->rd = (statp->options & RES_RECURSE) != 0U;
130 lastdnptr = dnptrs + nitems(dnptrs);
132 * perform opcode specific processing
135 case QUERY: /*FALLTHROUGH*/
137 if (ep - cp < QFIXEDSZ)
139 if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
147 hp->qdcount = htons(1);
148 if (op == QUERY || data == NULL)
151 * Make an additional record for completion domain.
153 if ((ep - cp) < RRFIXEDSZ)
155 n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,
160 ns_put16(T_NULL, cp);
168 hp->arcount = htons(1);
173 * Initialize answer section
175 if (ep - cp < 1 + RRFIXEDSZ + datalen)
177 *cp++ = '\0'; /*%< no domain name */
184 ns_put16(datalen, cp);
187 memcpy(cp, data, datalen);
190 hp->ancount = htons(1);
200 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
203 res_nopt(res_state statp,
204 int n0, /*%< current offset in buffer */
205 u_char *buf, /*%< buffer to put query */
206 int buflen, /*%< size of buffer */
207 int anslen) /*%< UDP answer buffer size */
214 if ((statp->options & RES_DEBUG) != 0U)
215 printf(";; res_nopt()\n");
222 if ((ep - cp) < 1 + RRFIXEDSZ)
225 *cp++ = 0; /*%< "." */
226 ns_put16(ns_t_opt, cp); /*%< TYPE */
229 anslen = 0xffff; /* limit to 16bit value */
230 ns_put16(anslen & 0xffff, cp); /*%< CLASS = UDP payload size */
232 *cp++ = NOERROR; /*%< extended RCODE */
233 *cp++ = 0; /*%< EDNS version */
235 if (statp->options & RES_USE_DNSSEC) {
237 if (statp->options & RES_DEBUG)
238 printf(";; res_opt()... ENDS0 DNSSEC\n");
240 flags |= NS_OPT_DNSSEC_OK;
245 ns_put16(0U, cp); /*%< RDLEN */
248 hp->arcount = htons(ntohs(hp->arcount) + 1);
254 * Construct variable data (RDATA) block for OPT pseudo-RR, append it
255 * to the buffer, then update the RDLEN field (previously set to zero by
256 * res_nopt()) with the new RDATA length.
259 res_nopt_rdata(res_state statp,
260 int n0, /*%< current offset in buffer */
261 u_char *buf, /*%< buffer to put query */
262 int buflen, /*%< size of buffer */
263 u_char *rdata, /*%< ptr to start of opt rdata */
264 u_short code, /*%< OPTION-CODE */
265 u_short len, /*%< OPTION-LENGTH */
266 u_char *data) /*%< OPTION_DATA */
268 register u_char *cp, *ep;
271 if ((statp->options & RES_DEBUG) != 0U)
272 printf(";; res_nopt_rdata()\n");
278 if ((ep - cp) < (4 + len))
281 if (rdata < (buf + 2) || rdata >= ep)
290 memcpy(cp, data, len);
294 ns_put16(len, rdata - 2); /* Update RDLEN field */