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-rw-r--r--libc/netbsd/nameser/ns_parse.c209
1 files changed, 209 insertions, 0 deletions
diff --git a/libc/netbsd/nameser/ns_parse.c b/libc/netbsd/nameser/ns_parse.c
new file mode 100644
index 0000000..fd94860
--- /dev/null
+++ b/libc/netbsd/nameser/ns_parse.c
@@ -0,0 +1,209 @@
+/* $NetBSD: ns_parse.c,v 1.2 2004/05/20 20:35:05 christos Exp $ */
+
+/*
+ * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 1996,1999 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 <sys/cdefs.h>
+#ifndef lint
+#ifdef notdef
+static const char rcsid[] = "Id: ns_parse.c,v 1.3.2.1.4.1 2004/03/09 08:33:44 marka Exp";
+#else
+__RCSID("$NetBSD: ns_parse.c,v 1.2 2004/05/20 20:35:05 christos Exp $");
+#endif
+#endif
+
+/* Import. */
+
+#include <sys/types.h>
+
+#include <netinet/in.h>
+#include "arpa_nameser.h"
+
+#include <errno.h>
+#ifdef ANDROID_CHANGES
+#include "resolv_private.h"
+#else
+#include <resolv.h>
+#endif
+#include <string.h>
+
+/* Forward. */
+
+static void setsection(ns_msg *msg, ns_sect sect);
+
+/* Macros. */
+
+#define RETERR(err) do { errno = (err); return (-1); } while (/*NOTREACHED*//*CONSTCOND*/0)
+
+/* Public. */
+
+/* These need to be in the same order as the nres.h:ns_flag enum. */
+const struct _ns_flagdata _ns_flagdata[16] = {
+ { 0x8000, 15 }, /* qr. */
+ { 0x7800, 11 }, /* opcode. */
+ { 0x0400, 10 }, /* aa. */
+ { 0x0200, 9 }, /* tc. */
+ { 0x0100, 8 }, /* rd. */
+ { 0x0080, 7 }, /* ra. */
+ { 0x0040, 6 }, /* z. */
+ { 0x0020, 5 }, /* ad. */
+ { 0x0010, 4 }, /* cd. */
+ { 0x000f, 0 }, /* rcode. */
+ { 0x0000, 0 }, /* expansion (1/6). */
+ { 0x0000, 0 }, /* expansion (2/6). */
+ { 0x0000, 0 }, /* expansion (3/6). */
+ { 0x0000, 0 }, /* expansion (4/6). */
+ { 0x0000, 0 }, /* expansion (5/6). */
+ { 0x0000, 0 }, /* expansion (6/6). */
+};
+
+int ns_msg_getflag(ns_msg handle, int flag) {
+ return((u_int32_t)((handle)._flags & _ns_flagdata[flag].mask) >> _ns_flagdata[flag].shift);
+}
+
+int
+ns_skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) {
+ const u_char *optr = ptr;
+
+ for (; count > 0; count--) {
+ int b, rdlength;
+
+ b = dn_skipname(ptr, eom);
+ if (b < 0)
+ RETERR(EMSGSIZE);
+ ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
+ if (section != ns_s_qd) {
+ if (ptr + NS_INT32SZ + NS_INT16SZ > eom)
+ RETERR(EMSGSIZE);
+ ptr += NS_INT32SZ/*TTL*/;
+ NS_GET16(rdlength, ptr);
+ ptr += rdlength/*RData*/;
+ }
+ }
+ if (ptr > eom)
+ RETERR(EMSGSIZE);
+ return (ptr - optr);
+}
+
+int
+ns_initparse(const u_char *msg, int msglen, ns_msg *handle) {
+ const u_char *eom = msg + msglen;
+ int i;
+
+ memset(handle, 0x5e, sizeof *handle);
+ handle->_msg = msg;
+ handle->_eom = eom;
+ if (msg + NS_INT16SZ > eom)
+ RETERR(EMSGSIZE);
+ NS_GET16(handle->_id, msg);
+ if (msg + NS_INT16SZ > eom)
+ RETERR(EMSGSIZE);
+ NS_GET16(handle->_flags, msg);
+ for (i = 0; i < ns_s_max; i++) {
+ if (msg + NS_INT16SZ > eom)
+ RETERR(EMSGSIZE);
+ NS_GET16(handle->_counts[i], msg);
+ }
+ for (i = 0; i < ns_s_max; i++)
+ if (handle->_counts[i] == 0)
+ handle->_sections[i] = NULL;
+ else {
+ int b = ns_skiprr(msg, eom, (ns_sect)i,
+ handle->_counts[i]);
+
+ if (b < 0)
+ return (-1);
+ handle->_sections[i] = msg;
+ msg += b;
+ }
+ if (msg != eom)
+ RETERR(EMSGSIZE);
+ setsection(handle, ns_s_max);
+ return (0);
+}
+
+int
+ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) {
+ int b;
+
+ /* Make section right. */
+ if ((unsigned)section >= (unsigned)ns_s_max)
+ RETERR(ENODEV);
+ if (section != handle->_sect)
+ setsection(handle, section);
+
+ /* Make rrnum right. */
+ if (rrnum == -1)
+ rrnum = handle->_rrnum;
+ if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
+ RETERR(ENODEV);
+ if (rrnum < handle->_rrnum)
+ setsection(handle, section);
+ if (rrnum > handle->_rrnum) {
+ b = ns_skiprr(handle->_msg_ptr, handle->_eom, section,
+ rrnum - handle->_rrnum);
+
+ if (b < 0)
+ return (-1);
+ handle->_msg_ptr += b;
+ handle->_rrnum = rrnum;
+ }
+
+ /* Do the parse. */
+ b = dn_expand(handle->_msg, handle->_eom,
+ handle->_msg_ptr, rr->name, NS_MAXDNAME);
+ if (b < 0)
+ return (-1);
+ handle->_msg_ptr += b;
+ if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
+ RETERR(EMSGSIZE);
+ NS_GET16(rr->type, handle->_msg_ptr);
+ NS_GET16(rr->rr_class, handle->_msg_ptr);
+ if (section == ns_s_qd) {
+ rr->ttl = 0;
+ rr->rdlength = 0;
+ rr->rdata = NULL;
+ } else {
+ if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
+ RETERR(EMSGSIZE);
+ NS_GET32(rr->ttl, handle->_msg_ptr);
+ NS_GET16(rr->rdlength, handle->_msg_ptr);
+ if (handle->_msg_ptr + rr->rdlength > handle->_eom)
+ RETERR(EMSGSIZE);
+ rr->rdata = handle->_msg_ptr;
+ handle->_msg_ptr += rr->rdlength;
+ }
+ if (++handle->_rrnum > handle->_counts[(int)section])
+ setsection(handle, (ns_sect)((int)section + 1));
+
+ /* All done. */
+ return (0);
+}
+
+/* Private. */
+
+static void
+setsection(ns_msg *msg, ns_sect sect) {
+ msg->_sect = sect;
+ if (sect == ns_s_max) {
+ msg->_rrnum = -1;
+ msg->_msg_ptr = NULL;
+ } else {
+ msg->_rrnum = 0;
+ msg->_msg_ptr = msg->_sections[(int)sect];
+ }
+}