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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 18:24:20 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 18:24:20 +0000
commit483eb2f56657e8e7f419ab1a4fab8dce9ade8609 (patch)
treee5d88d25d870d5dedacb6bbdbe2a966086a0a5cf /src/c-ares/ares_parse_ns_reply.c
parentInitial commit. (diff)
downloadceph-483eb2f56657e8e7f419ab1a4fab8dce9ade8609.tar.xz
ceph-483eb2f56657e8e7f419ab1a4fab8dce9ade8609.zip
Adding upstream version 14.2.21.upstream/14.2.21upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/c-ares/ares_parse_ns_reply.c')
-rw-r--r--src/c-ares/ares_parse_ns_reply.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/src/c-ares/ares_parse_ns_reply.c b/src/c-ares/ares_parse_ns_reply.c
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+/* Copyright 1998 by the Massachusetts Institute of Technology.
+ *
+ * Permission to use, copy, modify, and distribute this
+ * software and its documentation for any purpose and without
+ * fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting
+ * documentation, and that the name of M.I.T. not be used in
+ * advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose. It is provided "as is"
+ * without express or implied warranty.
+ */
+
+/*
+ * ares_parse_ns_reply created by Vlad Dinulescu <vlad.dinulescu@avira.com>
+ * on behalf of AVIRA Gmbh - http://www.avira.com
+ */
+
+#include "ares_setup.h"
+
+#ifdef HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif
+#ifdef HAVE_NETDB_H
+# include <netdb.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+# include <arpa/inet.h>
+#endif
+#ifdef HAVE_ARPA_NAMESER_H
+# include <arpa/nameser.h>
+#else
+# include "nameser.h"
+#endif
+#ifdef HAVE_ARPA_NAMESER_COMPAT_H
+# include <arpa/nameser_compat.h>
+#endif
+
+#include "ares.h"
+#include "ares_dns.h"
+#include "ares_private.h"
+
+int ares_parse_ns_reply( const unsigned char* abuf, int alen,
+ struct hostent** host )
+{
+ unsigned int qdcount, ancount;
+ int status, i, rr_type, rr_class, rr_len;
+ int nameservers_num;
+ long len;
+ const unsigned char *aptr;
+ char* hostname, *rr_name, *rr_data, **nameservers;
+ struct hostent *hostent;
+
+ /* Set *host to NULL for all failure cases. */
+ *host = NULL;
+
+ /* Give up if abuf doesn't have room for a header. */
+ if ( alen < HFIXEDSZ )
+ return ARES_EBADRESP;
+
+ /* Fetch the question and answer count from the header. */
+ qdcount = DNS_HEADER_QDCOUNT( abuf );
+ ancount = DNS_HEADER_ANCOUNT( abuf );
+ if ( qdcount != 1 )
+ return ARES_EBADRESP;
+
+ /* Expand the name from the question, and skip past the question. */
+ aptr = abuf + HFIXEDSZ;
+ status = ares__expand_name_for_response( aptr, abuf, alen, &hostname, &len);
+ if ( status != ARES_SUCCESS )
+ return status;
+ if ( aptr + len + QFIXEDSZ > abuf + alen )
+ {
+ ares_free( hostname );
+ return ARES_EBADRESP;
+ }
+ aptr += len + QFIXEDSZ;
+
+ /* Allocate nameservers array; ancount gives an upper bound */
+ nameservers = ares_malloc( ( ancount + 1 ) * sizeof( char * ) );
+ if ( !nameservers )
+ {
+ ares_free( hostname );
+ return ARES_ENOMEM;
+ }
+ nameservers_num = 0;
+
+ /* Examine each answer resource record (RR) in turn. */
+ for ( i = 0; i < ( int ) ancount; i++ )
+ {
+ /* Decode the RR up to the data field. */
+ status = ares__expand_name_for_response( aptr, abuf, alen, &rr_name, &len );
+ if ( status != ARES_SUCCESS )
+ break;
+ aptr += len;
+ if ( aptr + RRFIXEDSZ > abuf + alen )
+ {
+ status = ARES_EBADRESP;
+ ares_free(rr_name);
+ break;
+ }
+ rr_type = DNS_RR_TYPE( aptr );
+ rr_class = DNS_RR_CLASS( aptr );
+ rr_len = DNS_RR_LEN( aptr );
+ aptr += RRFIXEDSZ;
+ if (aptr + rr_len > abuf + alen)
+ {
+ ares_free(rr_name);
+ status = ARES_EBADRESP;
+ break;
+ }
+
+ if ( rr_class == C_IN && rr_type == T_NS )
+ {
+ /* Decode the RR data and add it to the nameservers list */
+ status = ares__expand_name_for_response( aptr, abuf, alen, &rr_data,
+ &len);
+ if ( status != ARES_SUCCESS )
+ {
+ ares_free(rr_name);
+ break;
+ }
+
+ nameservers[nameservers_num] = ares_malloc(strlen(rr_data)+1);
+
+ if (nameservers[nameservers_num]==NULL)
+ {
+ ares_free(rr_name);
+ ares_free(rr_data);
+ status=ARES_ENOMEM;
+ break;
+ }
+ strcpy(nameservers[nameservers_num],rr_data);
+ ares_free(rr_data);
+
+ nameservers_num++;
+ }
+
+ ares_free( rr_name );
+
+ aptr += rr_len;
+ if ( aptr > abuf + alen )
+ { /* LCOV_EXCL_START: already checked above */
+ status = ARES_EBADRESP;
+ break;
+ } /* LCOV_EXCL_STOP */
+ }
+
+ if ( status == ARES_SUCCESS && nameservers_num == 0 )
+ {
+ status = ARES_ENODATA;
+ }
+ if ( status == ARES_SUCCESS )
+ {
+ /* We got our answer. Allocate memory to build the host entry. */
+ nameservers[nameservers_num] = NULL;
+ hostent = ares_malloc( sizeof( struct hostent ) );
+ if ( hostent )
+ {
+ hostent->h_addr_list = ares_malloc( 1 * sizeof( char * ) );
+ if ( hostent->h_addr_list )
+ {
+ /* Fill in the hostent and return successfully. */
+ hostent->h_name = hostname;
+ hostent->h_aliases = nameservers;
+ hostent->h_addrtype = AF_INET;
+ hostent->h_length = sizeof( struct in_addr );
+ hostent->h_addr_list[0] = NULL;
+ *host = hostent;
+ return ARES_SUCCESS;
+ }
+ ares_free( hostent );
+ }
+ status = ARES_ENOMEM;
+ }
+ for ( i = 0; i < nameservers_num; i++ )
+ ares_free( nameservers[i] );
+ ares_free( nameservers );
+ ares_free( hostname );
+ return status;
+}