1 files changed, 331 insertions, 0 deletions
diff --git a/lib/libc/resolv/res_data.c b/lib/libc/resolv/res_data.c
new file mode 100644
index 000000000000..b6e3008c4e35
--- /dev/null
+++ b/lib/libc/resolv/res_data.c
@@ -0,0 +1,331 @@
+/*-
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 1995-1999 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+ * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "port_before.h"
+
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+
+#include <ctype.h>
+#include <netdb.h>
+#include <resolv.h>
+#include <res_update.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "port_after.h"
+
+const char *_res_opcodes[] = {
+	"QUERY",
+	"IQUERY",
+	"CQUERYM",
+	"CQUERYU",	/*%< experimental */
+	"NOTIFY",	/*%< experimental */
+	"UPDATE",
+	"6",
+	"7",
+	"8",
+	"9",
+	"10",
+	"11",
+	"12",
+	"13",
+	"ZONEINIT",
+	"ZONEREF",
+};
+
+#ifdef BIND_UPDATE
+const char *_res_sectioncodes[] = {
+	"ZONE",
+	"PREREQUISITES",
+	"UPDATE",
+	"ADDITIONAL",
+};
+#endif
+
+#ifndef __BIND_NOSTATIC
+
+/* Proto. */
+
+int  res_ourserver_p(const res_state, const struct sockaddr_in *);
+
+__noinline int
+res_init(void) {
+	extern int __res_vinit(res_state, int);
+	res_state statp = &_res;
+
+	/*
+	 * These three fields used to be statically initialized.  This made
+	 * it hard to use this code in a shared library.  It is necessary,
+	 * now that we're doing dynamic initialization here, that we preserve
+	 * the old semantics: if an application modifies one of these three
+	 * fields of _res before res_init() is called, res_init() will not
+	 * alter them.  Of course, if an application is setting them to
+	 * _zero_ before calling res_init(), hoping to override what used
+	 * to be the static default, we can't detect it and unexpected results
+	 * will follow.  Zero for any of these fields would make no sense,
+	 * so one can safely assume that the applications were already getting
+	 * unexpected results.
+	 *
+	 * _res.options is tricky since some apps were known to diddle the bits
+	 * before res_init() was first called. We can't replicate that semantic
+	 * with dynamic initialization (they may have turned bits off that are
+	 * set in RES_DEFAULT).  Our solution is to declare such applications
+	 * "broken".  They could fool us by setting RES_INIT but none do (yet).
+	 */
+	if (!statp->retrans)
+		statp->retrans = RES_TIMEOUT;
+	if (!statp->retry)
+		statp->retry = RES_DFLRETRY;
+	if (!(statp->options & RES_INIT))
+		statp->options = RES_DEFAULT;
+
+	return (__res_vinit(statp, 1));
+}
+
+void
+p_query(const u_char *msg) {
+	fp_query(msg, stdout);
+}
+
+void
+fp_query(const u_char *msg, FILE *file) {
+	fp_nquery(msg, PACKETSZ, file);
+}
+
+void
+fp_nquery(const u_char *msg, int len, FILE *file) {
+	res_state statp = &_res;
+	if ((statp->options & RES_INIT) == 0U && res_init() == -1)
+		return;
+
+	res_pquery(statp, msg, len, file);
+}
+
+int
+res_mkquery(int op,			/*!< opcode of query  */
+	    const char *dname,		/*!< domain name  */
+	    int class, int type,	/*!< class and type of query  */
+	    const u_char *data,		/*!< resource record data  */
+	    int datalen,		/*!< length of data  */
+	    const u_char *newrr_in,	/*!< new rr for modify or append  */
+	    u_char *buf,		/*!< buffer to put query  */
+	    int buflen)			/*!< size of buffer  */
+{
+	res_state statp = &_res;
+	if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
+		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
+		return (-1);
+	}
+	return (res_nmkquery(statp, op, dname, class, type,
+			     data, datalen,
+			     newrr_in, buf, buflen));
+}
+
+int
+res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
+	res_state statp = &_res;
+	if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
+		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
+		return (-1);
+	}
+
+	return (res_nmkupdate(statp, rrecp_in, buf, buflen));
+}
+
+int
+res_query(const char *name,	/*!< domain name  */
+	  int class, int type,	/*!< class and type of query  */
+	  u_char *answer,	/*!< buffer to put answer  */
+	  int anslen)		/*!< size of answer buffer  */
+{
+	res_state statp = &_res;
+	if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
+		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
+		return (-1);
+	}
+	return (res_nquery(statp, name, class, type, answer, anslen));
+}
+
+#ifndef _LIBC
+void
+res_send_setqhook(res_send_qhook hook) {
+	_res.qhook = hook;
+}
+
+void
+res_send_setrhook(res_send_rhook hook) {
+	_res.rhook = hook;
+}
+#endif
+
+int
+res_isourserver(const struct sockaddr_in *inp) {
+	return (res_ourserver_p(&_res, inp));
+}
+
+int
+res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
+	res_state statp = &_res;
+	if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
+		/* errno should have been set by res_init() in this case. */
+		return (-1);
+	}
+
+	return (res_nsend(statp, buf, buflen, ans, anssiz));
+}
+
+#ifndef _LIBC
+int
+res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
+	       u_char *ans, int anssiz)
+{
+	res_state statp = &_res;
+	if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
+		/* errno should have been set by res_init() in this case. */
+		return (-1);
+	}
+
+	return (res_nsendsigned(statp, buf, buflen, key, ans, anssiz));
+}
+#endif
+
+void
+res_close(void) {
+	res_nclose(&_res);
+}
+
+int
+res_update(ns_updrec *rrecp_in) {
+	res_state statp = &_res;
+	if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
+		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
+		return (-1);
+	}
+
+	return (res_nupdate(statp, rrecp_in, NULL));
+}
+
+int
+res_search(const char *name,	/*!< domain name  */
+	   int class, int type,	/*!< class and type of query  */
+	   u_char *answer,	/*!< buffer to put answer  */
+	   int anslen)		/*!< size of answer  */
+{
+	res_state statp = &_res;
+	if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
+		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
+		return (-1);
+	}
+
+	return (res_nsearch(statp, name, class, type, answer, anslen));
+}
+
+int
+res_querydomain(const char *name,
+		const char *domain,
+		int class, int type,	/*!< class and type of query  */
+		u_char *answer,		/*!< buffer to put answer  */
+		int anslen)		/*!< size of answer  */
+{
+	res_state statp = &_res;
+	if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
+		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
+		return (-1);
+	}
+
+	return (res_nquerydomain(statp, name, domain,
+				 class, type,
+				 answer, anslen));
+}
+
+u_int
+res_randomid(void) {
+	res_state statp = &_res;
+	if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
+		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
+		return (-1);
+	}
+
+	return (res_nrandomid(statp));
+}
+
+int
+res_opt(int n0, u_char *buf, int buflen, int anslen)
+{
+	return (res_nopt(&_res, n0, buf, buflen, anslen));
+}
+
+const char *
+hostalias(const char *name) {
+	static char abuf[MAXDNAME];
+
+	return (res_hostalias(&_res, name, abuf, sizeof abuf));
+}
+
+#ifdef ultrix
+int
+local_hostname_length(const char *hostname) {
+	int len_host, len_domain;
+	res_state statp;
+
+	statp = &_res;
+	if (!*statp->defdname)
+		res_init();
+	len_host = strlen(hostname);
+	len_domain = strlen(statp->defdname);
+	if (len_host > len_domain &&
+	    !strcasecmp(hostname + len_host - len_domain, statp->defdname) &&
+	    hostname[len_host - len_domain - 1] == '.')
+		return (len_host - len_domain - 1);
+	return (0);
+}
+#endif /*ultrix*/
+
+/*
+ * Weak aliases for applications that use certain private entry points,
+ * and fail to include <resolv.h>.
+ */
+#undef res_init
+__weak_reference(__res_init, res_init);
+#undef p_query
+__weak_reference(__p_query, p_query);
+#undef res_mkquery
+__weak_reference(__res_mkquery, res_mkquery);
+#undef res_query
+__weak_reference(__res_query, res_query);
+#undef res_send
+__weak_reference(__res_send, res_send);
+#undef res_close
+__weak_reference(__res_close, _res_close);
+#undef res_search
+__weak_reference(__res_search, res_search);
+#undef res_querydomain
+__weak_reference(__res_querydomain, res_querydomain);
+
+#endif
+
+/*! \file */