libc/resolv/res_query.c

111 res_nquery(res_state statp,
123 	oflags = statp->_flags;
128 	if (statp->options & RES_DEBUG)
132 	n = res_nmkquery(statp, QUERY, name, class, type, NULL, 0, NULL,
135 	if (n > 0 && (statp->_flags & RES_F_EDNS0ERR) == 0 &&
136 	    (statp->options & (RES_USE_EDNS0|RES_USE_DNSSEC|RES_NSID))) {
137 		n = res_nopt(statp, n, buf, sizeof(buf), anslen);
138 		if (n > 0 && (statp->options & RES_NSID) != 0U) {
140 			n = res_nopt_rdata(statp, n, buf, sizeof(buf), rdata,
147 		if (statp->options & RES_DEBUG)
150 		RES_SET_H_ERRNO(statp, NO_RECOVERY);
154 	n = res_nsend(statp, buf, n, answer, anslen);
158 		if ((statp->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U &&
159 		    ((oflags ^ statp->_flags) & RES_F_EDNS0ERR) != 0) {
160 			statp->_flags |= RES_F_EDNS0ERR;
161 			if (statp->options & RES_DEBUG)
167 		if (statp->options & RES_DEBUG)
170 		RES_SET_H_ERRNO(statp, TRY_AGAIN);
176 		if (statp->options & RES_DEBUG)
185 			RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
188 			RES_SET_H_ERRNO(statp, TRY_AGAIN);
191 			RES_SET_H_ERRNO(statp, NO_DATA);
197 			RES_SET_H_ERRNO(statp, NO_RECOVERY);
212 res_nsearch(res_state statp,
228 	RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);  /*%< True if we never query. */
237 	if (!dots && (cp = res_hostalias(statp, name, tmp, sizeof tmp))!= NULL)
238 		return (res_nquery(statp, cp, class, type, answer, anslen));
246 	if (dots >= statp->ndots || trailing_dot) {
247 		ret = res_nquerydomain(statp, name, NULL, class, type,
252 			RES_SET_H_ERRNO(statp, TRY_AGAIN);
255 		switch (statp->res_h_errno) {
266 		saved_herrno = statp->res_h_errno;
276 	if ((!dots && (statp->options & RES_DEFNAMES) != 0U) ||
277 	    (dots && !trailing_dot && (statp->options & RES_DNSRCH) != 0U)) {
280 		for (domain = (const char * const *)statp->dnsrch;
292 			ret = res_nquerydomain(statp, name, *domain,
312 				RES_SET_H_ERRNO(statp, TRY_AGAIN);
316 			switch (statp->res_h_errno) {
355 			if ((statp->options & RES_DNSRCH) == 0U)
360 	switch (statp->res_h_errno) {
376 	if ((dots || !searched || (statp->options & RES_NOTLDQUERY) == 0U) &&
378 		ret = res_nquerydomain(statp, name, NULL, class, type,
393 		RES_SET_H_ERRNO(statp, saved_herrno);
395 		RES_SET_H_ERRNO(statp, NO_DATA);
397 		RES_SET_H_ERRNO(statp, TRY_AGAIN);
406 res_nquerydomain(res_state statp,
418 	if (statp->options & RES_DEBUG)
429 			RES_SET_H_ERRNO(statp, NO_RECOVERY);
442 			RES_SET_H_ERRNO(statp, NO_RECOVERY);
447 	return (res_nquery(statp, longname, class, type, answer, anslen));
451 res_hostalias(const res_state statp, const char *name, char *dst, size_t siz) {
456 	if (statp->options & RES_NOALIASES)