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authorRemko Tronçon <git@el-tramo.be>2009-12-03 20:06:33 (GMT)
committerRemko Tronçon <git@el-tramo.be>2009-12-03 20:06:33 (GMT)
commit5df50c35e1baeee517a0895a2c8a2cc2052b087f (patch)
treeb9d90fd123ec251ebb930cfcfaa2ffc805433812 /3rdParty/CAres/src/ares_parse_ns_reply.c
parent9b3edba27b8683f1a87ad66ee05802dd93bbbdfc (diff)
downloadswift-contrib-5df50c35e1baeee517a0895a2c8a2cc2052b087f.zip
swift-contrib-5df50c35e1baeee517a0895a2c8a2cc2052b087f.tar.bz2
Added C-Ares.
Diffstat (limited to '3rdParty/CAres/src/ares_parse_ns_reply.c')
-rw-r--r--3rdParty/CAres/src/ares_parse_ns_reply.c182
1 files changed, 182 insertions, 0 deletions
diff --git a/3rdParty/CAres/src/ares_parse_ns_reply.c b/3rdParty/CAres/src/ares_parse_ns_reply.c
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+++ b/3rdParty/CAres/src/ares_parse_ns_reply.c
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+/* $Id */
+
+/* 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_SYS_SOCKET_H
+# include <sys/socket.h>
+#endif
+#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 <stdlib.h>
+#include <string.h>
+#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 )
+ {
+ free( hostname );
+ return ARES_EBADRESP;
+ }
+ aptr += len + QFIXEDSZ;
+
+ /* Allocate nameservers array; ancount gives an upper bound */
+ nameservers = malloc( ( ancount + 1 ) * sizeof( char * ) );
+ if ( !nameservers )
+ {
+ 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;
+ break;
+ }
+ rr_type = DNS_RR_TYPE( aptr );
+ rr_class = DNS_RR_CLASS( aptr );
+ rr_len = DNS_RR_LEN( aptr );
+ aptr += RRFIXEDSZ;
+
+ 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 )
+ {
+ break;
+ }
+
+ nameservers[nameservers_num] = malloc(strlen(rr_data)+1);
+
+ if (nameservers[nameservers_num]==NULL)
+ {
+ free(rr_name);
+ free(rr_data);
+ status=ARES_ENOMEM;
+ break;
+ }
+ strcpy(nameservers[nameservers_num],rr_data);
+ free(rr_data);
+
+ nameservers_num++;
+ }
+
+ free( rr_name );
+
+ aptr += rr_len;
+ if ( aptr > abuf + alen )
+ {
+ status = ARES_EBADRESP;
+ break;
+ }
+ }
+
+ 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 = malloc( sizeof( struct hostent ) );
+ if ( hostent )
+ {
+ hostent->h_addr_list = 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;
+ }
+ free( hostent );
+ }
+ status = ARES_ENOMEM;
+ }
+ for ( i = 0; i < nameservers_num; i++ )
+ free( nameservers[i] );
+ free( nameservers );
+ free( hostname );
+ return status;
+}