Adding upstream version 2.4.1.upstream/2.4.1 upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
author: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-13 12:15:43 +0000
committer: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-13 12:15:43 +0000
commit: f5f56e1a1c4d9e9496fcb9d81131066a964ccd23 (patch)
tree: 49e44c6f87febed37efb953ab5485aa49f6481a7 /src/lib/asiodns
parent: Initial commit. (diff)
download: isc-kea-f5f56e1a1c4d9e9496fcb9d81131066a964ccd23.tar.xz
isc-kea-f5f56e1a1c4d9e9496fcb9d81131066a964ccd23.zip
14 files changed, 3911 insertions, 0 deletions
diff --git a/src/lib/asiodns/Makefile.am b/src/lib/asiodns/Makefile.am
new file mode 100644
index 0000000..2897989
--- /dev/null
+++ b/src/lib/asiodns/Makefile.am
@@ -0,0 +1,72 @@
+SUBDIRS = . tests
+
+AM_CPPFLAGS = -I$(top_srcdir)/src/lib -I$(top_builddir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+CLEANFILES = *.gcno *.gcda
+
+lib_LTLIBRARIES = libkea-asiodns.la
+
+libkea_asiodns_la_LDFLAGS = -no-undefined -version-info 35:0:0
+
+libkea_asiodns_la_SOURCES = io_fetch.cc io_fetch.h
+libkea_asiodns_la_SOURCES += logger.h logger.cc
+libkea_asiodns_la_SOURCES += asiodns_messages.cc asiodns_messages.h
+
+EXTRA_DIST = asiodns_messages.mes
+
+# Note: the ordering matters: -Wno-... must follow -Wextra (defined in
+# KEA_CXXFLAGS)
+libkea_asiodns_la_CXXFLAGS = $(AM_CXXFLAGS)
+libkea_asiodns_la_CPPFLAGS = $(AM_CPPFLAGS)
+libkea_asiodns_la_LIBADD  = $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+libkea_asiodns_la_LIBADD += $(top_builddir)/src/lib/dns/libkea-dns++.la
+libkea_asiodns_la_LIBADD += $(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la
+libkea_asiodns_la_LIBADD += $(top_builddir)/src/lib/log/libkea-log.la
+libkea_asiodns_la_LIBADD += $(top_builddir)/src/lib/util/libkea-util.la
+libkea_asiodns_la_LIBADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+libkea_asiodns_la_LIBADD += $(BOOST_LIBS)
+libkea_asiodns_la_LIBADD += $(LOG4CPLUS_LIBS)
+
+# If we want to get rid of all generated messages files, we need to use
+# make maintainer-clean. The proper way to introduce custom commands for
+# that operation is to define maintainer-clean-local target. However,
+# make maintainer-clean also removes Makefile, so running configure script
+# is required.  To make it easy to rebuild messages without going through
+# reconfigure, a new target messages-clean has been added.
+maintainer-clean-local:
+	rm -f asiodns_messages.h asiodns_messages.cc
+
+# To regenerate messages files, one can do:
+#
+# make messages-clean
+# make messages
+#
+# This is needed only when a .mes file is modified.
+messages-clean: maintainer-clean-local
+
+if GENERATE_MESSAGES
+
+# Define rule to build logging source files from message file
+messages: asiodns_messages.h asiodns_messages.cc
+	@echo Message files regenerated
+
+asiodns_messages.h asiodns_messages.cc: asiodns_messages.mes
+	$(top_builddir)/src/lib/log/compiler/kea-msg-compiler $(top_srcdir)/src/lib/asiodns/asiodns_messages.mes
+
+else
+
+messages asiodns_messages.h asiodns_messages.cc:
+	@echo Messages generation disabled. Configure with --enable-generate-messages to enable it.
+
+endif
+
+# Specify the headers for copying into the installation directory tree.
+libkea_asiodns_includedir = $(pkgincludedir)/asiodns
+libkea_asiodns_include_HEADERS = \
+	asiodns_messages.h \
+	io_fetch.h \
+	logger.h
+
diff --git a/src/lib/asiodns/Makefile.in b/src/lib/asiodns/Makefile.in
new file mode 100644
index 0000000..dda9b26
--- /dev/null
+++ b/src/lib/asiodns/Makefile.in
@@ -0,0 +1,1022 @@
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+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-recursive
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+	@list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    $(am__make_dryrun) \
+	      || test -d "$(distdir)/$$subdir" \
+	      || $(MKDIR_P) "$(distdir)/$$subdir" \
+	      || exit 1; \
+	    dir1=$$subdir; dir2="$(distdir)/$$subdir"; \
+	    $(am__relativize); \
+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
+	    $(am__relativize); \
+	    new_top_distdir=$$reldir; \
+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
+	    ($(am__cd) $$subdir && \
+	      $(MAKE) $(AM_MAKEFLAGS) \
+	        top_distdir="$$new_top_distdir" \
+	        distdir="$$new_distdir" \
+		am__remove_distdir=: \
+		am__skip_length_check=: \
+		am__skip_mode_fix=: \
+	        distdir) \
+	      || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-recursive
+all-am: Makefile $(LTLIBRARIES) $(HEADERS)
+installdirs: installdirs-recursive
+installdirs-am:
+	for dir in "$(DESTDIR)$(libdir)" "$(DESTDIR)$(libkea_asiodns_includedir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: install-recursive
+install-exec: install-exec-recursive
+install-data: install-data-recursive
+uninstall: uninstall-recursive
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libLTLIBRARIES clean-libtool \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/libkea_asiodns_la-asiodns_messages.Plo
+	-rm -f ./$(DEPDIR)/libkea_asiodns_la-io_fetch.Plo
+	-rm -f ./$(DEPDIR)/libkea_asiodns_la-logger.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
+
+info-am:
+
+install-data-am: install-libkea_asiodns_includeHEADERS
+
+install-dvi: install-dvi-recursive
+
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+
+install-exec-am: install-libLTLIBRARIES
+
+install-html: install-html-recursive
+
+install-html-am:
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+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/libkea_asiodns_la-asiodns_messages.Plo
+	-rm -f ./$(DEPDIR)/libkea_asiodns_la-io_fetch.Plo
+	-rm -f ./$(DEPDIR)/libkea_asiodns_la-logger.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic \
+	maintainer-clean-local
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am: uninstall-libLTLIBRARIES \
+	uninstall-libkea_asiodns_includeHEADERS
+
+.MAKE: $(am__recursive_targets) install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-am clean clean-generic \
+	clean-libLTLIBRARIES clean-libtool cscopelist-am ctags \
+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-libLTLIBRARIES \
+	install-libkea_asiodns_includeHEADERS install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs installdirs-am \
+	maintainer-clean maintainer-clean-generic \
+	maintainer-clean-local mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am uninstall-libLTLIBRARIES \
+	uninstall-libkea_asiodns_includeHEADERS
+
+.PRECIOUS: Makefile
+
+
+# If we want to get rid of all generated messages files, we need to use
+# make maintainer-clean. The proper way to introduce custom commands for
+# that operation is to define maintainer-clean-local target. However,
+# make maintainer-clean also removes Makefile, so running configure script
+# is required.  To make it easy to rebuild messages without going through
+# reconfigure, a new target messages-clean has been added.
+maintainer-clean-local:
+	rm -f asiodns_messages.h asiodns_messages.cc
+
+# To regenerate messages files, one can do:
+#
+# make messages-clean
+# make messages
+#
+# This is needed only when a .mes file is modified.
+messages-clean: maintainer-clean-local
+
+# Define rule to build logging source files from message file
+@GENERATE_MESSAGES_TRUE@messages: asiodns_messages.h asiodns_messages.cc
+@GENERATE_MESSAGES_TRUE@	@echo Message files regenerated
+
+@GENERATE_MESSAGES_TRUE@asiodns_messages.h asiodns_messages.cc: asiodns_messages.mes
+@GENERATE_MESSAGES_TRUE@	$(top_builddir)/src/lib/log/compiler/kea-msg-compiler $(top_srcdir)/src/lib/asiodns/asiodns_messages.mes
+
+@GENERATE_MESSAGES_FALSE@messages asiodns_messages.h asiodns_messages.cc:
+@GENERATE_MESSAGES_FALSE@	@echo Messages generation disabled. Configure with --enable-generate-messages to enable it.
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/asiodns/README b/src/lib/asiodns/README
new file mode 100644
index 0000000..e785845
--- /dev/null
+++ b/src/lib/asiodns/README
@@ -0,0 +1,154 @@
+The asiodns library is intended to provide an abstraction layer between
+BIND10 modules and asiolink library.
+
+These DNS server and client routines are written using the "stackless
+coroutine" pattern invented by Chris Kohlhoff and described at
+http://blog.think-async.com/2010/03/potted-guide-to-stackless-coroutines.html.
+This is intended to simplify development a bit, since it allows the
+routines to be written in a straightforward step-step-step fashion rather
+than as a complex chain of separate handler functions.
+
+Coroutine objects (i.e., UDPServer, TCPServer and IOFetch) are objects
+with reentrant operator() members.  When an instance of one of these
+classes is called as a function, it resumes at the position where it left
+off.  Thus, a UDPServer can issue an asynchronous I/O call and specify
+itself as the handler object; when the call completes, the UDPServer
+carries on at the same position.  As a result, the code can look as
+if it were using synchronous, not asynchronous, I/O, providing some of
+the benefit of threading but with minimal switching overhead.
+
+So, in simplified form, the behavior of a DNS Server is:
+
+  REENTER:
+    while true:
+      YIELD packet = read_packet
+      FORK
+      if not parent:
+        break
+
+    YIELD answer = DNSLookup(packet, this)
+    response = DNSAnswer(answer)
+    YIELD send(response)
+
+At each "YIELD" point, the coroutine initiates an asynchronous operation,
+then pauses and turns over control to some other task on the ASIO service
+queue.  When the operation completes, the coroutine resumes.
+
+DNSLookup and DNSAnswer define callback methods
+used by a DNS Server to communicate with the module that called it.
+They are abstract-only classes whose concrete implementations
+are supplied by the calling module.
+
+The DNSLookup callback always runs asynchronously.  Concrete
+implementations must be sure to call the server's "resume" method when
+it is finished.
+
+In an authoritative server, the DNSLookup implementation would examine
+the query, look up the answer, then call "resume".  (See the diagram
+in doc/auth_process.jpg.)
+
+In a recursive server, the DNSLookup implementation would initiate a
+DNSQuery, which in turn would be responsible for calling the server's
+"resume" method.  (See the diagram in doc/recursive_process.jpg.)
+
+A DNSQuery object is intended to handle resolution of a query over
+the network when the local authoritative data sources or cache are not
+sufficient.  The plan is that it will make use of subsidiary DNSFetch
+calls to get data from particular authoritative servers, and when it has
+gotten a complete answer, it calls "resume".
+
+In current form, however, DNSQuery is much simpler; it forwards queries
+to a single upstream resolver and passes the answers back to the client.
+It is constructed with the address of the forward server.  Queries are
+initiated with the question to ask the forward server, a buffer into
+which to write the answer, and a pointer to the coroutine to be resumed
+when the answer has arrived.  In simplified form, the DNSQuery routine is:
+
+  REENTER:
+    render the question into a wire-format query packet
+    YIELD send(query)
+    YIELD response = read_packet
+    server->resume
+
+Currently, DNSQuery is only implemented for UDP queries.  In future work
+it will be necessary to write code to fall back to TCP when circumstances
+require it.
+
+
+Upstream Fetches
+================
+Upstream fetches (queries by the resolver on behalf of a client) are made
+using a slightly-modified version of the pattern described above.
+
+Sockets
+-------
+First, it will be useful to understand the class hierarchy used in the
+fetch logic:
+
+        IOSocket
+           |
+      IOAsioSocket
+           |
+     +-----+-----+
+     |           |
+UDPSocket    TCPSocket
+
+IOSocket is a wrapper class for a socket and is used by the authoritative
+server code.  It is an abstract base class, providing little more that the ability to hold the socket and to return the protocol in use.
+
+Built on this is IOAsioSocket, which adds the open, close, asyncSend and
+asyncReceive methods.  This is a template class, which takes as template
+argument the class of the object that will be used as the callback when the
+asynchronous operation completes. This object can be of any type, but must
+include an operator() method with the signature:
+
+   operator()(boost::system::error_code ec, size_t length)
+
+... the two arguments being the status of the completed I/O operation and
+the number of bytes transferred. (In the case of the open method, the second
+argument will be zero.)
+
+Finally, the TCPSocket and UDPSocket classes provide the body of the
+asynchronous operations.
+
+Fetch Sequence
+--------------
+The fetch is implemented by the IOFetch class, which takes as argument the
+protocol to use.  The sequence is:
+
+  REENTER:
+    render the question into a wire-format query packet
+    open()                           // Open socket and optionally connect
+    if (! synchronous) {
+        YIELD;
+    }
+    YIELD asyncSend(query)           // Send query
+    do {
+        YIELD asyncReceive(response) // Read response
+    } while (! complete(response))
+    close()                          // Drop connection and close socket
+    server->resume
+
+The open() method opens a socket for use.  On TCP, it also makes a
+connection to the remote end.  So under UDP the operation will complete
+immediately, but under TCP it could take a long time.  One solution would be
+for the open operation to post an event to the I/O queue; then both cases
+could be regarded as being equivalent, with the completion being signalled
+by the posting of the completion event.  However UDP is the most common case
+and that would involve extra overhead.  So the open() returns a status
+indicating whether the operation completed asynchronously.  If it did, the
+code yields back to the coroutine; if not the yield is bypassed.
+
+The asynchronous send is straightforward, invoking the underlying ASIO
+function.  (Note that the address/port is supplied to both the open() and
+asyncSend() methods - it is used by the TCPSocket in open() and by the
+UDPSocket in asyncSend().)
+
+The asyncReceive() method issues an asynchronous read and waits for completion.
+The fetch object keeps track of the amount of data received so far and when
+the receive completes it calls a method on the socket to determine if the
+entire message has been received.  (This will always be the case for UDP.  On
+TCP though, the message is preceded by a count field as several reads may be
+required to read all the data.)  The fetch loops until all the data is read.
+
+Finally, the socket is closed and the server called to resume operation.
diff --git a/src/lib/asiodns/asiodns_messages.cc b/src/lib/asiodns/asiodns_messages.cc
new file mode 100644
index 0000000..7900294
--- /dev/null
+++ b/src/lib/asiodns/asiodns_messages.cc
@@ -0,0 +1,73 @@
+// File created from ../../../src/lib/asiodns/asiodns_messages.mes
+
+#include <cstddef>
+#include <log/message_types.h>
+#include <log/message_initializer.h>
+
+namespace isc {
+namespace asiodns {
+
+extern const isc::log::MessageID ASIODNS_FD_ADD_TCP = "ASIODNS_FD_ADD_TCP";
+extern const isc::log::MessageID ASIODNS_FD_ADD_UDP = "ASIODNS_FD_ADD_UDP";
+extern const isc::log::MessageID ASIODNS_FETCH_COMPLETED = "ASIODNS_FETCH_COMPLETED";
+extern const isc::log::MessageID ASIODNS_FETCH_STOPPED = "ASIODNS_FETCH_STOPPED";
+extern const isc::log::MessageID ASIODNS_OPEN_SOCKET = "ASIODNS_OPEN_SOCKET";
+extern const isc::log::MessageID ASIODNS_READ_DATA = "ASIODNS_READ_DATA";
+extern const isc::log::MessageID ASIODNS_READ_TIMEOUT = "ASIODNS_READ_TIMEOUT";
+extern const isc::log::MessageID ASIODNS_SEND_DATA = "ASIODNS_SEND_DATA";
+extern const isc::log::MessageID ASIODNS_SYNC_UDP_CLOSE_FAIL = "ASIODNS_SYNC_UDP_CLOSE_FAIL";
+extern const isc::log::MessageID ASIODNS_TCP_ACCEPT_FAIL = "ASIODNS_TCP_ACCEPT_FAIL";
+extern const isc::log::MessageID ASIODNS_TCP_CLEANUP_CLOSE_FAIL = "ASIODNS_TCP_CLEANUP_CLOSE_FAIL";
+extern const isc::log::MessageID ASIODNS_TCP_CLOSE_ACCEPTOR_FAIL = "ASIODNS_TCP_CLOSE_ACCEPTOR_FAIL";
+extern const isc::log::MessageID ASIODNS_TCP_CLOSE_FAIL = "ASIODNS_TCP_CLOSE_FAIL";
+extern const isc::log::MessageID ASIODNS_TCP_CLOSE_NORESP_FAIL = "ASIODNS_TCP_CLOSE_NORESP_FAIL";
+extern const isc::log::MessageID ASIODNS_TCP_GETREMOTE_FAIL = "ASIODNS_TCP_GETREMOTE_FAIL";
+extern const isc::log::MessageID ASIODNS_TCP_READDATA_FAIL = "ASIODNS_TCP_READDATA_FAIL";
+extern const isc::log::MessageID ASIODNS_TCP_READLEN_FAIL = "ASIODNS_TCP_READLEN_FAIL";
+extern const isc::log::MessageID ASIODNS_TCP_WRITE_FAIL = "ASIODNS_TCP_WRITE_FAIL";
+extern const isc::log::MessageID ASIODNS_UDP_ASYNC_SEND_FAIL = "ASIODNS_UDP_ASYNC_SEND_FAIL";
+extern const isc::log::MessageID ASIODNS_UDP_CLOSE_FAIL = "ASIODNS_UDP_CLOSE_FAIL";
+extern const isc::log::MessageID ASIODNS_UDP_RECEIVE_FAIL = "ASIODNS_UDP_RECEIVE_FAIL";
+extern const isc::log::MessageID ASIODNS_UDP_SYNC_RECEIVE_FAIL = "ASIODNS_UDP_SYNC_RECEIVE_FAIL";
+extern const isc::log::MessageID ASIODNS_UDP_SYNC_SEND_FAIL = "ASIODNS_UDP_SYNC_SEND_FAIL";
+extern const isc::log::MessageID ASIODNS_UNKNOWN_ORIGIN = "ASIODNS_UNKNOWN_ORIGIN";
+extern const isc::log::MessageID ASIODNS_UNKNOWN_RESULT = "ASIODNS_UNKNOWN_RESULT";
+
+} // namespace asiodns
+} // namespace isc
+
+namespace {
+
+const char* values[] = {
+    "ASIODNS_FD_ADD_TCP", "adding a new TCP server by opened fd %1",
+    "ASIODNS_FD_ADD_UDP", "adding a new UDP server by opened fd %1",
+    "ASIODNS_FETCH_COMPLETED", "upstream fetch to %1(%2) has now completed",
+    "ASIODNS_FETCH_STOPPED", "upstream fetch to %1(%2) has been stopped",
+    "ASIODNS_OPEN_SOCKET", "error %1 opening %2 socket to %3(%4)",
+    "ASIODNS_READ_DATA", "error %1 reading %2 data from %3(%4)",
+    "ASIODNS_READ_TIMEOUT", "receive timeout while waiting for data from %1(%2)",
+    "ASIODNS_SEND_DATA", "error %1 sending data using %2 to %3(%4)",
+    "ASIODNS_SYNC_UDP_CLOSE_FAIL", "failed to close a DNS/UDP socket: %1",
+    "ASIODNS_TCP_ACCEPT_FAIL", "failed to accept TCP DNS connection: %1",
+    "ASIODNS_TCP_CLEANUP_CLOSE_FAIL", "failed to close a DNS/TCP socket on port cleanup: %1",
+    "ASIODNS_TCP_CLOSE_ACCEPTOR_FAIL", "failed to close listening TCP socket: %1",
+    "ASIODNS_TCP_CLOSE_FAIL", "failed to close DNS/TCP socket with a client: %1",
+    "ASIODNS_TCP_CLOSE_NORESP_FAIL", "failed to close DNS/TCP socket with a client: %1",
+    "ASIODNS_TCP_GETREMOTE_FAIL", "failed to get remote address of a DNS TCP connection: %1",
+    "ASIODNS_TCP_READDATA_FAIL", "failed to get DNS data on a TCP socket: %1",
+    "ASIODNS_TCP_READLEN_FAIL", "failed to get DNS data length on a TCP socket: %1",
+    "ASIODNS_TCP_WRITE_FAIL", "failed to send DNS message over a TCP socket: %1",
+    "ASIODNS_UDP_ASYNC_SEND_FAIL", "Error sending UDP packet to %1: %2",
+    "ASIODNS_UDP_CLOSE_FAIL", "failed to close a DNS/UDP socket: %1",
+    "ASIODNS_UDP_RECEIVE_FAIL", "failed to receive UDP DNS packet: %1",
+    "ASIODNS_UDP_SYNC_RECEIVE_FAIL", "failed to receive UDP DNS packet: %1",
+    "ASIODNS_UDP_SYNC_SEND_FAIL", "Error sending UDP packet to %1: %2",
+    "ASIODNS_UNKNOWN_ORIGIN", "unknown origin for ASIO error code %1 (protocol: %2, address %3)",
+    "ASIODNS_UNKNOWN_RESULT", "unknown result (%1) when IOFetch::stop() was executed for I/O to %2(%3)",
+    NULL
+};
+
+const isc::log::MessageInitializer initializer(values);
+
+} // Anonymous namespace
+
diff --git a/src/lib/asiodns/asiodns_messages.h b/src/lib/asiodns/asiodns_messages.h
new file mode 100644
index 0000000..b3dab48
--- /dev/null
+++ b/src/lib/asiodns/asiodns_messages.h
@@ -0,0 +1,40 @@
+// File created from ../../../src/lib/asiodns/asiodns_messages.mes
+
+#ifndef ASIODNS_MESSAGES_H
+#define ASIODNS_MESSAGES_H
+
+#include <log/message_types.h>
+
+namespace isc {
+namespace asiodns {
+
+extern const isc::log::MessageID ASIODNS_FD_ADD_TCP;
+extern const isc::log::MessageID ASIODNS_FD_ADD_UDP;
+extern const isc::log::MessageID ASIODNS_FETCH_COMPLETED;
+extern const isc::log::MessageID ASIODNS_FETCH_STOPPED;
+extern const isc::log::MessageID ASIODNS_OPEN_SOCKET;
+extern const isc::log::MessageID ASIODNS_READ_DATA;
+extern const isc::log::MessageID ASIODNS_READ_TIMEOUT;
+extern const isc::log::MessageID ASIODNS_SEND_DATA;
+extern const isc::log::MessageID ASIODNS_SYNC_UDP_CLOSE_FAIL;
+extern const isc::log::MessageID ASIODNS_TCP_ACCEPT_FAIL;
+extern const isc::log::MessageID ASIODNS_TCP_CLEANUP_CLOSE_FAIL;
+extern const isc::log::MessageID ASIODNS_TCP_CLOSE_ACCEPTOR_FAIL;
+extern const isc::log::MessageID ASIODNS_TCP_CLOSE_FAIL;
+extern const isc::log::MessageID ASIODNS_TCP_CLOSE_NORESP_FAIL;
+extern const isc::log::MessageID ASIODNS_TCP_GETREMOTE_FAIL;
+extern const isc::log::MessageID ASIODNS_TCP_READDATA_FAIL;
+extern const isc::log::MessageID ASIODNS_TCP_READLEN_FAIL;
+extern const isc::log::MessageID ASIODNS_TCP_WRITE_FAIL;
+extern const isc::log::MessageID ASIODNS_UDP_ASYNC_SEND_FAIL;
+extern const isc::log::MessageID ASIODNS_UDP_CLOSE_FAIL;
+extern const isc::log::MessageID ASIODNS_UDP_RECEIVE_FAIL;
+extern const isc::log::MessageID ASIODNS_UDP_SYNC_RECEIVE_FAIL;
+extern const isc::log::MessageID ASIODNS_UDP_SYNC_SEND_FAIL;
+extern const isc::log::MessageID ASIODNS_UNKNOWN_ORIGIN;
+extern const isc::log::MessageID ASIODNS_UNKNOWN_RESULT;
+
+} // namespace asiodns
+} // namespace isc
+
+#endif // ASIODNS_MESSAGES_H
diff --git a/src/lib/asiodns/asiodns_messages.mes b/src/lib/asiodns/asiodns_messages.mes
new file mode 100644
index 0000000..1f7f35e
--- /dev/null
+++ b/src/lib/asiodns/asiodns_messages.mes
@@ -0,0 +1,167 @@
+# Copyright (C) 2011-2015 Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+$NAMESPACE isc::asiodns
+
+% ASIODNS_FD_ADD_TCP adding a new TCP server by opened fd %1
+A debug message informing about installing a file descriptor as a server.
+The file descriptor number is noted.
+
+% ASIODNS_FD_ADD_UDP adding a new UDP server by opened fd %1
+A debug message informing about installing a file descriptor as a server.
+The file descriptor number is noted.
+
+% ASIODNS_FETCH_COMPLETED upstream fetch to %1(%2) has now completed
+A debug message, this records that the upstream fetch (a query made by the
+resolver on behalf of its client) to the specified address has completed.
+
+% ASIODNS_FETCH_STOPPED upstream fetch to %1(%2) has been stopped
+An external component has requested the halting of an upstream fetch.  This
+is an allowed operation, and the message should only appear if debug is
+enabled.
+
+% ASIODNS_OPEN_SOCKET error %1 opening %2 socket to %3(%4)
+The asynchronous I/O code encountered an error when trying to open a socket
+of the specified protocol in order to send a message to the target address.
+The number of the system error that caused the problem is given in the
+message.
+
+% ASIODNS_READ_DATA error %1 reading %2 data from %3(%4)
+The asynchronous I/O code encountered an error when trying to read data from
+the specified address on the given protocol.  The number of the system
+error that caused the problem is given in the message.
+
+% ASIODNS_READ_TIMEOUT receive timeout while waiting for data from %1(%2)
+An upstream fetch from the specified address timed out.  This may happen for
+any number of reasons and is most probably a problem at the remote server
+or a problem on the network.  The message will only appear if debug is
+enabled.
+
+% ASIODNS_SEND_DATA error %1 sending data using %2 to %3(%4)
+The asynchronous I/O code encountered an error when trying to send data to
+the specified address on the given protocol.  The number of the system
+error that caused the problem is given in the message.
+
+% ASIODNS_SYNC_UDP_CLOSE_FAIL failed to close a DNS/UDP socket: %1
+This is the same to ASIODNS_UDP_CLOSE_FAIL but happens on the
+"synchronous UDP server", mainly used for the authoritative DNS server
+daemon.
+
+% ASIODNS_TCP_ACCEPT_FAIL failed to accept TCP DNS connection: %1
+Accepting a TCP connection from a DNS client failed due to an error
+that could happen but should be rare.  The reason for the error is
+included in the log message.  The server still keeps accepting new
+connections, so unless it happens often it's probably okay to ignore
+this error.  If the shown error indicates something like "too many
+open files", it's probably because the run time environment is too
+restrictive on this limitation, so consider adjusting the limit using
+a tool such as ulimit.  If you see other types of errors too often,
+there may be something overlooked; please file a bug report in that case.
+
+% ASIODNS_TCP_CLEANUP_CLOSE_FAIL failed to close a DNS/TCP socket on port cleanup: %1
+A TCP DNS server tried to close a TCP socket (one created on accepting
+a new connection or is already unused) as a step of cleaning up the
+corresponding listening port, but it failed to do that.  This is
+generally an unexpected event and so is logged as an error.
+See also the description of ASIODNS_TCP_CLOSE_ACCEPTOR_FAIL.
+
+% ASIODNS_TCP_CLOSE_ACCEPTOR_FAIL failed to close listening TCP socket: %1
+A TCP DNS server tried to close a listening TCP socket (for accepting
+new connections) as a step of cleaning up the corresponding listening
+port (e.g., on server shutdown or updating port configuration), but it
+failed to do that.  This is generally an unexpected event and so is
+logged as an error.  See ASIODNS_TCP_CLOSE_FAIL on the implication of
+related system resources.
+
+% ASIODNS_TCP_CLOSE_FAIL failed to close DNS/TCP socket with a client: %1
+A TCP DNS server tried to close a TCP socket used to communicate with
+a client, but it failed to do that.  While closing a socket should
+normally be an error-free operation, there have been known cases where
+this happened with a "connection reset by peer" error.  This might be
+because of some odd client behavior, such as sending a TCP RST after
+establishing the connection and before the server closes the socket,
+but how exactly this could happen seems to be system dependent (i.e,
+it's not part of the standard socket API), so it's difficult to
+provide a general explanation.  In any case, it is believed that an
+error on closing a socket doesn't mean leaking system resources (the
+kernel should clean up any internal resource related to the socket,
+just reporting an error detected in the close call), but, again, it
+seems to be system dependent.  This message is logged at a debug level
+as it's known to happen and could be triggered by a remote node and it
+would be better to not be too verbose, but you might want to increase
+the log level and make sure there's no resource leak or other system
+level troubles when it's logged.
+
+% ASIODNS_TCP_CLOSE_NORESP_FAIL failed to close DNS/TCP socket with a client: %1
+A TCP DNS server tried to close a TCP socket used to communicate with
+a client without returning an answer (which normally happens for zone
+transfer requests), but it failed to do that.  See ASIODNS_TCP_CLOSE_FAIL
+for more details.
+
+% ASIODNS_TCP_GETREMOTE_FAIL failed to get remote address of a DNS TCP connection: %1
+A TCP DNS server tried to get the address and port of a remote client
+on a connected socket but failed.  It's expected to be rare but can
+still happen.  See also ASIODNS_TCP_READLEN_FAIL.
+
+% ASIODNS_TCP_READDATA_FAIL failed to get DNS data on a TCP socket: %1
+A TCP DNS server tried to read a DNS message (that follows a 2-byte
+length field) but failed.  It's expected to be rare but can still happen.
+See also ASIODNS_TCP_READLEN_FAIL.
+
+% ASIODNS_TCP_READLEN_FAIL failed to get DNS data length on a TCP socket: %1
+A TCP DNS server tried to get the length field of a DNS message (the first
+2 bytes of a new chunk of data) but failed.  This is generally expected to
+be rare but can still happen, e.g, due to an unexpected reset of the
+connection.  A specific reason for the failure is included in the log
+message.
+
+% ASIODNS_TCP_WRITE_FAIL failed to send DNS message over a TCP socket: %1
+A TCP DNS server tried to send a DNS message to a remote client but
+failed.  It's expected to be rare but can still happen.  See also
+ASIODNS_TCP_READLEN_FAIL.
+
+% ASIODNS_UDP_ASYNC_SEND_FAIL Error sending UDP packet to %1: %2
+The low-level ASIO library reported an error when trying to send a UDP
+packet in asynchronous UDP mode. This can be any error reported by
+send_to(), and can indicate problems such as too high a load on the network,
+or a problem in the underlying library or system.
+This packet is dropped and will not be sent, but service should resume
+normally.
+If you see a single occurrence of this message, it probably does not
+indicate any significant problem, but if it is logged often, it is probably
+a good idea to inspect your network traffic.
+
+% ASIODNS_UDP_CLOSE_FAIL failed to close a DNS/UDP socket: %1
+A UDP DNS server tried to close its UDP socket, but failed to do that.
+This is generally an unexpected event and so is logged as an error.
+
+% ASIODNS_UDP_RECEIVE_FAIL failed to receive UDP DNS packet: %1
+Receiving a UDP packet from a DNS client failed due to an error that
+could happen but should be very rare.  The server still keeps
+receiving UDP packets on this socket.  The reason for the error is
+included in the log message.  This log message is basically not
+expected to appear at all in practice; if it does, there may be some
+system level failure and other system logs may have to be checked.
+
+% ASIODNS_UDP_SYNC_RECEIVE_FAIL failed to receive UDP DNS packet: %1
+This is the same to ASIODNS_UDP_RECEIVE_FAIL but happens on the
+"synchronous UDP server", mainly used for the authoritative DNS server
+daemon.
+
+% ASIODNS_UDP_SYNC_SEND_FAIL Error sending UDP packet to %1: %2
+The low-level ASIO library reported an error when trying to send a UDP
+packet in synchronous UDP mode. See ASIODNS_UDP_ASYNC_SEND_FAIL for
+more information.
+
+% ASIODNS_UNKNOWN_ORIGIN unknown origin for ASIO error code %1 (protocol: %2, address %3)
+An internal consistency check on the origin of a message from the
+asynchronous I/O module failed. This may indicate an internal error;
+please submit a bug report.
+
+% ASIODNS_UNKNOWN_RESULT unknown result (%1) when IOFetch::stop() was executed for I/O to %2(%3)
+An internal error indicating that the termination method of the resolver's
+upstream fetch class was called with an unknown result code (which is
+given in the message).  Please submit a bug report.
diff --git a/src/lib/asiodns/io_fetch.cc b/src/lib/asiodns/io_fetch.cc
new file mode 100644
index 0000000..980a600
--- /dev/null
+++ b/src/lib/asiodns/io_fetch.cc
@@ -0,0 +1,402 @@
+// Copyright (C) 2011-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/io_address.h>
+#include <asiolink/io_asio_socket.h>
+#include <asiolink/io_endpoint.h>
+#include <asiolink/io_service.h>
+#include <asiolink/tcp_endpoint.h>
+#include <asiolink/tcp_socket.h>
+#include <asiolink/udp_endpoint.h>
+#include <asiolink/udp_socket.h>
+#include <asiodns/io_fetch.h>
+#include <asiodns/logger.h>
+#include <dns/messagerenderer.h>
+#include <dns/opcode.h>
+#include <dns/qid_gen.h>
+#include <dns/rcode.h>
+#include <util/buffer.h>
+
+#include <boost/scoped_ptr.hpp>
+#include <boost/date_time/posix_time/posix_time_types.hpp>
+
+#include <functional>
+#include <unistd.h>             // for some IPC/network system calls
+#include <netinet/in.h>
+#include <stdint.h>
+#include <sys/socket.h>
+
+using namespace boost::asio;
+using namespace isc::asiolink;
+using namespace isc::dns;
+using namespace isc::util;
+using namespace isc::log;
+using namespace std;
+
+namespace isc {
+namespace asiodns {
+
+// Log debug verbosity
+
+const int DBG_IMPORTANT = DBGLVL_TRACE_BASIC;
+const int DBG_COMMON = DBGLVL_TRACE_DETAIL;
+const int DBG_ALL = DBGLVL_TRACE_DETAIL + 20;
+
+/// \brief IOFetch Data
+///
+/// The data for IOFetch is held in a separate struct pointed to by a shared_ptr
+/// object.  This is because the IOFetch object will be copied often (it is used
+/// as a coroutine and passed as callback to many async_*() functions) and we
+/// want keep the same data).  Organising the data in this way keeps copying to
+/// a minimum.
+struct IOFetchData {
+
+    // The first two members are shared pointers to a base class because what is
+    // actually instantiated depends on whether the fetch is over UDP or TCP,
+    // which is not known until construction of the IOFetch.  Use of a shared
+    // pointer here is merely to ensure deletion when the data object is deleted.
+    boost::scoped_ptr<IOAsioSocket<IOFetch> > socket;
+                                             ///< Socket to use for I/O
+    boost::scoped_ptr<IOEndpoint> remote_snd;///< Where the fetch is sent
+    boost::scoped_ptr<IOEndpoint> remote_rcv;///< Where the response came from
+    OutputBufferPtr   msgbuf;      ///< Wire buffer for question
+    OutputBufferPtr   received;    ///< Received data put here
+    IOFetch::Callback*          callback;    ///< Called on I/O Completion
+    boost::asio::deadline_timer timer;       ///< Timer to measure timeouts
+    IOFetch::Protocol           protocol;    ///< Protocol being used
+    size_t                      cumulative;  ///< Cumulative received amount
+    size_t                      expected;    ///< Expected amount of data
+    size_t                      offset;      ///< Offset to receive data
+    bool                        stopped;     ///< Have we stopped running?
+    int                         timeout;     ///< Timeout in ms
+    bool                        packet;      ///< true if packet was supplied
+
+    // In case we need to log an error, the origin of the last asynchronous
+    // I/O is recorded.  To save time and simplify the code, this is recorded
+    // as the ID of the error message that would be generated if the I/O failed.
+    // This means that we must make sure that all possible "origins" take the
+    // same arguments in their message in the same order.
+    isc::log::MessageID         origin;     ///< Origin of last asynchronous I/O
+    uint8_t                     staging[IOFetch::STAGING_LENGTH];
+                                            ///< Temporary array for received data
+    isc::dns::qid_t             qid;         ///< The QID set in the query
+
+    /// \brief Constructor
+    ///
+    /// Just fills in the data members of the IOFetchData structure
+    ///
+    /// \param proto Either IOFetch::TCP or IOFetch::UDP.
+    /// \param service I/O Service object to handle the asynchronous
+    ///        operations.
+    /// \param address IP address of upstream server
+    /// \param port Port to use for the query
+    /// \param buff Output buffer into which the response (in wire format)
+    ///        is written (if a response is received).
+    /// \param cb Callback object containing the callback to be called
+    ///        when we terminate.  The caller is responsible for managing this
+    ///        object and deleting it if necessary.
+    /// \param wait Timeout for the fetch (in ms).
+    ///
+    /// TODO: May need to alter constructor (see comment 4 in Trac ticket #554)
+    IOFetchData(IOFetch::Protocol proto, IOService& service,
+        const IOAddress& address, uint16_t port, OutputBufferPtr& buff,
+        IOFetch::Callback* cb, int wait) :
+        socket((proto == IOFetch::UDP) ?
+            static_cast<IOAsioSocket<IOFetch>*>(
+                new UDPSocket<IOFetch>(service)) :
+            static_cast<IOAsioSocket<IOFetch>*>(
+                new TCPSocket<IOFetch>(service))
+            ),
+        remote_snd((proto == IOFetch::UDP) ?
+            static_cast<IOEndpoint*>(new UDPEndpoint(address, port)) :
+            static_cast<IOEndpoint*>(new TCPEndpoint(address, port))
+            ),
+        remote_rcv((proto == IOFetch::UDP) ?
+            static_cast<IOEndpoint*>(new UDPEndpoint(address, port)) :
+            static_cast<IOEndpoint*>(new TCPEndpoint(address, port))
+            ),
+        msgbuf(new OutputBuffer(512)),
+        received(buff),
+        callback(cb),
+        timer(service.get_io_service()),
+        protocol(proto),
+        cumulative(0),
+        expected(0),
+        offset(0),
+        stopped(false),
+        timeout(wait),
+        packet(false),
+        origin(ASIODNS_UNKNOWN_ORIGIN),
+        staging(),
+        qid(QidGenerator::getInstance().generateQid())
+    {}
+
+    // Checks if the response we received was ok;
+    // - data contains the buffer we read, as well as the address
+    // we sent to and the address we received from.
+    // length is provided by the operator() in IOFetch.
+    // Addresses must match, number of octets read must be at least
+    // 2, and the first two octets must match the qid of the message
+    // we sent.
+    bool responseOK() {
+        return (*remote_snd == *remote_rcv && cumulative >= 2 &&
+                readUint16(received->getData(), received->getLength()) == qid);
+    }
+};
+
+/// IOFetch Constructor - just initialize the private data
+
+IOFetch::IOFetch(Protocol protocol, IOService& service,
+    const isc::dns::Question& question, const IOAddress& address,
+    uint16_t port, OutputBufferPtr& buff, Callback* cb, int wait, bool edns) {
+    MessagePtr query_msg(new Message(Message::RENDER));
+    initIOFetch(query_msg, protocol, service, question, address, port, buff,
+                cb, wait, edns);
+}
+
+IOFetch::IOFetch(Protocol protocol, IOService& service,
+    OutputBufferPtr& outpkt, const IOAddress& address, uint16_t port,
+    OutputBufferPtr& buff, Callback* cb, int wait) :
+    data_(new IOFetchData(protocol, service,
+          address, port, buff, cb, wait)) {
+    data_->msgbuf = outpkt;
+    data_->packet = true;
+}
+
+IOFetch::IOFetch(Protocol protocol, IOService& service,
+    ConstMessagePtr query_message, const IOAddress& address, uint16_t port,
+    OutputBufferPtr& buff, Callback* cb, int wait) {
+    MessagePtr msg(new Message(Message::RENDER));
+
+    msg->setHeaderFlag(Message::HEADERFLAG_RD,
+                       query_message->getHeaderFlag(Message::HEADERFLAG_RD));
+    msg->setHeaderFlag(Message::HEADERFLAG_CD,
+                       query_message->getHeaderFlag(Message::HEADERFLAG_CD));
+
+    initIOFetch(msg, protocol, service,
+                **(query_message->beginQuestion()),
+                address, port, buff, cb, wait);
+}
+
+void
+IOFetch::initIOFetch(MessagePtr& query_msg, Protocol protocol,
+                     IOService& service,
+                     const isc::dns::Question& question,
+                     const IOAddress& address, uint16_t port,
+                     OutputBufferPtr& buff, Callback* cb, int wait, bool edns) {
+    data_ = boost::shared_ptr<IOFetchData>(new IOFetchData(
+        protocol, service, address, port, buff, cb, wait));
+
+    query_msg->setQid(data_->qid);
+    query_msg->setOpcode(Opcode::QUERY());
+    query_msg->setRcode(Rcode::NOERROR());
+    query_msg->setHeaderFlag(Message::HEADERFLAG_RD);
+    query_msg->addQuestion(question);
+
+    if (edns) {
+        EDNSPtr edns_query(new EDNS());
+        edns_query->setUDPSize(Message::DEFAULT_MAX_EDNS0_UDPSIZE);
+        query_msg->setEDNS(edns_query);
+    }
+
+    MessageRenderer renderer;
+    renderer.setBuffer(data_->msgbuf.get());
+    query_msg->toWire(renderer);
+    renderer.setBuffer(NULL);
+}
+
+// Return protocol in use.
+
+IOFetch::Protocol
+IOFetch::getProtocol() const {
+    return (data_->protocol);
+}
+
+/// The function operator is implemented with the "stackless coroutine"
+/// pattern; see boost/asio/coroutine.hpp for details.
+
+void
+IOFetch::operator()(boost::system::error_code ec, size_t length) {
+    if (data_->stopped) {
+        return;
+
+    // On Debian it has been often observed that boost::asio async
+    // operations result in EINPROGRESS. This doesn't necessarily
+    // indicate an issue. Thus, we continue as if no error occurred.
+    } else if (ec && (ec.value() != boost::asio::error::in_progress)) {
+        logIOFailure(ec);
+        return;
+    }
+
+    BOOST_ASIO_CORO_REENTER (this) {
+
+        /// Generate the upstream query and render it to wire format
+        /// This is done in a different scope to allow inline variable
+        /// declarations.
+        {
+            if (data_->packet) {
+                // A packet was given, overwrite the QID (which is in the
+                // first two bytes of the packet).
+                data_->msgbuf->writeUint16At(data_->qid, 0);
+
+            }
+        }
+
+        // If we timeout, we stop, which cancels outstanding I/O operations and
+        // shuts down everything.
+        if (data_->timeout != -1) {
+            data_->timer.expires_from_now(boost::posix_time::milliseconds(
+                data_->timeout));
+            data_->timer.async_wait(std::bind(&IOFetch::stop, *this,
+                TIME_OUT));
+        }
+
+        // Open a connection to the target system.  For speed, if the operation
+        // is synchronous (i.e. UDP operation) we bypass the yield.
+        data_->origin = ASIODNS_OPEN_SOCKET;
+        if (data_->socket->isOpenSynchronous()) {
+            data_->socket->open(data_->remote_snd.get(), *this);
+        } else {
+            BOOST_ASIO_CORO_YIELD data_->socket->open(data_->remote_snd.get(), *this);
+        }
+
+        do {
+            // Begin an asynchronous send, and then yield.  When the send completes,
+            // we will resume immediately after this point.
+            data_->origin = ASIODNS_SEND_DATA;
+            BOOST_ASIO_CORO_YIELD data_->socket->asyncSend(data_->msgbuf->getData(),
+                data_->msgbuf->getLength(), data_->remote_snd.get(), *this);
+
+            // Now receive the response.  Since TCP may not receive the entire
+            // message in one operation, we need to loop until we have received
+            // it. (This can't be done within the asyncReceive() method because
+            // each I/O operation will be done asynchronously and between each one
+            // we need to yield ... and we *really* don't want to set up another
+            // coroutine within that method.)  So after each receive (and yield),
+            // we check if the operation is complete and if not, loop to read again.
+            //
+            // Another concession to TCP is that the amount of is contained in the
+            // first two bytes.  This leads to two problems:
+            //
+            // a) We don't want those bytes in the return buffer.
+            // b) They may not both arrive in the first I/O.
+            //
+            // So... we need to loop until we have at least two bytes, then store
+            // the expected amount of data.  Then we need to loop until we have
+            // received all the data before copying it back to the user's buffer.
+            // And we want to minimize the amount of copying...
+
+            data_->origin = ASIODNS_READ_DATA;
+            data_->cumulative = 0;          // No data yet received
+            data_->offset = 0;              // First data into start of buffer
+            data_->received->clear();       // Clear the receive buffer
+            do {
+                BOOST_ASIO_CORO_YIELD data_->socket->asyncReceive(data_->staging,
+                                        static_cast<size_t>(STAGING_LENGTH),
+                                        data_->offset,
+                                        data_->remote_rcv.get(), *this);
+            } while (!data_->socket->processReceivedData(data_->staging, length,
+                                        data_->cumulative, data_->offset,
+                                        data_->expected, data_->received));
+        } while (!data_->responseOK());
+
+        // Finished with this socket, so close it.  This will not generate an
+        // I/O error, but reset the origin to unknown in case we change this.
+        data_->origin = ASIODNS_UNKNOWN_ORIGIN;
+        data_->socket->close();
+
+        /// We are done
+        stop(SUCCESS);
+    }
+}
+
+// Function that stops the coroutine sequence.  It is called either when the
+// query finishes or when the timer times out.  Either way, it sets the
+// "stopped_" flag and cancels anything that is in progress.
+//
+// As the function may be entered multiple times as things wind down, it checks
+// if the stopped_ flag is already set.  If it is, the call is a no-op.
+
+void
+IOFetch::stop(Result result) {
+    if (!data_->stopped) {
+
+        // Mark the fetch as stopped to prevent other completion callbacks
+        // (invoked because of the calls to cancel()) from executing the
+        // cancel calls again.
+        //
+        // In a single threaded environment, the callbacks won't be invoked
+        // until this one completes. In a multi-threaded environment, they may
+        // well be, in which case the testing (and setting) of the stopped_
+        // variable should be done inside a mutex (and the stopped_ variable
+        // declared as "volatile").
+        //
+        // TODO: Update testing of stopped_ if threads are used.
+        data_->stopped = true;
+        switch (result) {
+            case TIME_OUT:
+                LOG_DEBUG(logger, DBG_COMMON, ASIODNS_READ_TIMEOUT).
+                    arg(data_->remote_snd->getAddress().toText()).
+                    arg(data_->remote_snd->getPort());
+                break;
+
+            case SUCCESS:
+                LOG_DEBUG(logger, DBG_ALL, ASIODNS_FETCH_COMPLETED).
+                    arg(data_->remote_rcv->getAddress().toText()).
+                    arg(data_->remote_rcv->getPort());
+                break;
+
+            case STOPPED:
+                // Fetch has been stopped for some other reason.  This is
+                // allowed but as it is unusual it is logged, but with a lower
+                // debug level than a timeout (which is totally normal).
+                LOG_DEBUG(logger, DBG_IMPORTANT, ASIODNS_FETCH_STOPPED).
+                    arg(data_->remote_snd->getAddress().toText()).
+                    arg(data_->remote_snd->getPort());
+                break;
+
+            default:
+                LOG_ERROR(logger, ASIODNS_UNKNOWN_RESULT).
+                    arg(data_->remote_snd->getAddress().toText()).
+                    arg(data_->remote_snd->getPort());
+        }
+
+        // Stop requested, cancel and I/O's on the socket and shut it down,
+        // and cancel the timer.
+        data_->socket->cancel();
+        data_->socket->close();
+
+        data_->timer.cancel();
+
+        // Execute the I/O completion callback (if present).
+        if (data_->callback) {
+            (*(data_->callback))(result);
+        }
+    }
+}
+
+// Log an error - called on I/O failure
+
+void IOFetch::logIOFailure(boost::system::error_code ec) {
+    // Should only get here with a known error code.
+    if ((data_->origin != ASIODNS_OPEN_SOCKET) &&
+        (data_->origin != ASIODNS_SEND_DATA) &&
+        (data_->origin != ASIODNS_READ_DATA) &&
+        (data_->origin != ASIODNS_UNKNOWN_ORIGIN)) {
+        isc_throw(isc::Unexpected, "impossible error code " << data_->origin);
+    }
+
+    LOG_ERROR(logger, data_->origin).arg(ec.value()).
+        arg((data_->remote_snd->getProtocol() == IPPROTO_TCP) ?
+                     "TCP" : "UDP").
+        arg(data_->remote_snd->getAddress().toText()).
+        arg(data_->remote_snd->getPort());
+}
+
+} // namespace asiodns
+} // namespace isc {
diff --git a/src/lib/asiodns/io_fetch.h b/src/lib/asiodns/io_fetch.h
new file mode 100644
index 0000000..4b247ab
--- /dev/null
+++ b/src/lib/asiodns/io_fetch.h
@@ -0,0 +1,246 @@
+// Copyright (C) 2010-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef IO_FETCH_H
+#define IO_FETCH_H 1
+
+#include <config.h>
+
+#include <boost/shared_array.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/date_time/posix_time/posix_time_types.hpp>
+
+// We want to use coroutine.hpp from the system's boost headers if possible.
+// However, very old Boost versions (provided by RHEL 7 or CentOS 7) didn't have
+// this header. So we can resort to our bundled version, but only if necessary.
+#ifdef HAVE_BOOST_ASIO_COROUTINE_HPP
+#include <boost/asio/coroutine.hpp>
+#else
+#include <ext/coroutine/coroutine.hpp>
+#endif
+
+#include <boost/system/error_code.hpp>
+#include <asiolink/io_address.h>
+#include <asiolink/io_service.h>
+
+#include <util/buffer.h>
+#include <dns/question.h>
+#include <dns/message.h>
+
+namespace isc {
+namespace asiodns {
+
+// Forward declarations
+struct IOFetchData;
+
+/// \brief Upstream Fetch Processing
+///
+/// IOFetch is the class used to send upstream fetches and to handle responses.
+///
+/// \param E Endpoint type to use.
+
+class IOFetch : public boost::asio::coroutine {
+public:
+    /// \brief Protocol to use on the fetch
+    enum Protocol {
+        UDP = 0,
+        TCP = 1
+    };
+
+    /// \brief Origin of Asynchronous I/O Call
+    ///
+    /// Indicates what initiated an asynchronous I/O call and used in deciding
+    /// what error message to output if the I/O fails.
+    enum Origin {
+        NONE = 0,           ///< No asynchronous call outstanding
+        OPEN = 1,
+        SEND = 2,
+        RECEIVE = 3,
+        CLOSE = 4
+    };
+
+    /// \brief Result of Upstream Fetch
+    ///
+    /// Note that this applies to the status of I/Os in the fetch - a fetch
+    /// that resulted in a packet being received from the server is a SUCCESS,
+    /// even if the contents of the packet indicate that some error occurred.
+    enum Result {
+        SUCCESS = 0,        ///< Success, fetch completed
+        TIME_OUT = 1,       ///< Failure, fetch timed out
+        STOPPED = 2,        ///< Control code, fetch has been stopped
+        NOTSET = 3          ///< For testing, indicates value not set
+    };
+
+    // The next enum is a "trick" to allow constants to be defined in a class
+    // declaration.
+
+    /// \brief Integer Constants
+    enum {
+        STAGING_LENGTH = 8192   ///< Size of staging buffer
+    };
+
+    /// \brief I/O Fetch Callback
+    ///
+    /// Class of callback object for when the fetch itself has completed - an
+    /// object of this class is passed to the IOFetch constructor and its
+    /// operator() method called when the fetch completes.
+    ///
+    /// Note the difference between the two operator() methods:
+    /// - IOFetch::operator() callback is called when an asynchronous I/O has
+    ///   completed.
+    /// - IOFetch::Callback::operator() is called when an upstream fetch - which
+    ///   may have involved several asynchronous I/O operations - has completed.
+    ///
+    /// This is an abstract class.
+    class Callback {
+    public:
+        /// \brief Default Constructor
+        Callback()
+        {}
+
+        /// \brief Virtual Destructor
+        virtual ~Callback()
+        {}
+
+        /// \brief Callback method
+        ///
+        /// This is the method called when the fetch completes.
+        ///
+        /// \param result Result of the fetch
+        virtual void operator()(Result result) = 0;
+    };
+
+    /// \brief Constructor.
+    ///
+    /// Creates the object that will handle the upstream fetch.
+    ///
+    /// \param protocol Fetch protocol, either IOFetch::TCP or IOFetch::UDP
+    /// \param service I/O Service object to handle the asynchronous
+    ///        operations.
+    /// \param question DNS question to send to the upstream server.
+    /// \param address IP address of upstream server
+    /// \param port Port to which to connect on the upstream server
+    /// \param buff Output buffer into which the response (in wire format)
+    ///        is written (if a response is received).
+    /// \param cb Callback object containing the callback to be called when we
+    ///        terminate.  The caller is responsible for managing this object
+    ///        and deleting it if necessary.
+    /// \param wait Timeout for the fetch (in ms).  The default value of
+    ///        -1 indicates no timeout.
+    /// \param edns true if the request should be EDNS. The default value is
+    ///        true.
+    IOFetch(Protocol protocol, isc::asiolink::IOService& service,
+            const isc::dns::Question& question,
+            const isc::asiolink::IOAddress& address,
+            uint16_t port, isc::util::OutputBufferPtr& buff, Callback* cb,
+            int wait = -1,
+            bool edns = true);
+
+    /// \brief Constructor
+    ///  This constructor has one parameter "query_message", which
+    ///  is the shared_ptr to a full query message. It's different
+    ///  with above constructor which has only question section. All
+    ///  other parameters are same.
+    ///
+    /// \param protocol Fetch protocol, either IOFetch::TCP or IOFetch::UDP
+    /// \param service I/O Service object to handle the asynchronous
+    ///        operations.
+    /// \param query_message the shared_ptr to a full query message
+    ///        got from a query client.
+    /// \param address IP address of upstream server
+    /// \param port Port to which to connect on the upstream server
+    /// \param buff Output buffer into which the response (in wire format)
+    ///        is written (if a response is received).
+    /// \param cb Callback object containing the callback to be called when we
+    ///        terminate.  The caller is responsible for managing this object
+    ///        and deleting it if necessary.
+    /// \param wait Timeout for the fetch (in ms).  The default value of
+    ///        -1 indicates no timeout.
+    IOFetch(Protocol protocol, isc::asiolink::IOService& service,
+            isc::dns::ConstMessagePtr query_message,
+            const isc::asiolink::IOAddress& address,
+            uint16_t port, isc::util::OutputBufferPtr& buff, Callback* cb,
+            int wait = -1);
+
+    /// \brief Constructor.
+    ///
+    /// Creates the object that will handle the upstream fetch.
+    ///
+    /// \param protocol Fetch protocol, either IOFetch::TCP or IOFetch::UDP
+    /// \param service I/O Service object to handle the asynchronous
+    ///     operations.
+    /// \param outpkt Packet to send to upstream server.  Note that the
+    ///     QID (first two bytes of the packet) may be altered in the sending.
+    /// \param buff Output buffer into which the response (in wire format)
+    ///     is written (if a response is received).
+    /// \param cb Callback object containing the callback to be called
+    ///     when we terminate.  The caller is responsible for managing this
+    ///     object and deleting it if necessary.
+    /// \param address IP address of upstream server
+    /// \param port Port to which to connect on the upstream server
+    /// (default = 53)
+    /// \param wait Timeout for the fetch (in ms).  The default value of
+    ///     -1 indicates no timeout.
+    IOFetch(Protocol protocol, isc::asiolink::IOService& service,
+            isc::util::OutputBufferPtr& outpkt,
+            const isc::asiolink::IOAddress& address,
+            uint16_t port, isc::util::OutputBufferPtr& buff, Callback* cb,
+            int wait = -1);
+
+    /// \brief Return Current Protocol
+    ///
+    /// \return Protocol associated with this IOFetch object.
+    Protocol getProtocol() const;
+
+    /// \brief Coroutine entry point
+    ///
+    /// The operator() method is the method in which the coroutine code enters
+    /// this object when an operation has been completed.
+    ///
+    /// \param ec Error code, the result of the last asynchronous I/O operation.
+    /// \param length Amount of data received on the last asynchronous read
+    void operator()(boost::system::error_code ec = boost::system::error_code(), size_t length = 0);
+
+    /// \brief Terminate query
+    ///
+    /// This method can be called at any point.  It terminates the current
+    /// query with the specified reason.
+    ///
+    /// \param reason Reason for terminating the query
+    void stop(Result reason = STOPPED);
+
+private:
+    /// \brief IOFetch Initialization Function.
+    /// All the parameters are same with the constructor, except
+    /// parameter "query_message"
+    /// \param query_message the message to be sent out.
+    void initIOFetch(isc::dns::MessagePtr& query_message, Protocol protocol,
+                     isc::asiolink::IOService& service,
+                     const isc::dns::Question& question,
+                     const isc::asiolink::IOAddress& address, uint16_t port,
+                     isc::util::OutputBufferPtr& buff, Callback* cb, int wait,
+                     bool edns = true);
+
+    /// \brief Log I/O Failure
+    ///
+    /// Records an I/O failure to the log file
+    ///
+    /// \param ec ASIO error code
+    void logIOFailure(boost::system::error_code ec);
+
+    // Member variables.  All data is in a structure pointed to by a shared
+    // pointer.  The IOFetch object is copied a number of times during its
+    // life, and only requiring a pointer to be copied reduces overhead.
+    boost::shared_ptr<IOFetchData> data_;   ///< Private data
+};
+
+/// \brief Defines a pointer to an IOFetch.
+typedef boost::shared_ptr<IOFetch> IOFetchPtr;
+
+} // namespace asiodns
+} // namespace isc
+
+#endif // IO_FETCH_H
diff --git a/src/lib/asiodns/logger.cc b/src/lib/asiodns/logger.cc
new file mode 100644
index 0000000..b14701c
--- /dev/null
+++ b/src/lib/asiodns/logger.cc
@@ -0,0 +1,19 @@
+// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <asiodns/logger.h>
+
+namespace isc {
+namespace asiodns {
+
+/// Use the ASIO logger
+
+isc::log::Logger logger("asiodns");
+
+}
+}
diff --git a/src/lib/asiodns/logger.h b/src/lib/asiodns/logger.h
new file mode 100644
index 0000000..e2d88e2
--- /dev/null
+++ b/src/lib/asiodns/logger.h
@@ -0,0 +1,18 @@
+// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <log/logger.h>
+#include <log/macros.h>
+#include <log/log_dbglevels.h>
+#include <asiodns/asiodns_messages.h>
+
+namespace isc {
+namespace asiodns {
+
+extern isc::log::Logger logger;
+
+}
+}
diff --git a/src/lib/asiodns/tests/Makefile.am b/src/lib/asiodns/tests/Makefile.am
new file mode 100644
index 0000000..74517c1
--- /dev/null
+++ b/src/lib/asiodns/tests/Makefile.am
@@ -0,0 +1,43 @@
+AM_CPPFLAGS = -I$(top_srcdir)/src/lib -I$(top_builddir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+if USE_STATIC_LINK
+AM_LDFLAGS = -static
+endif
+
+CLEANFILES = *.gcno *.gcda
+
+TESTS_ENVIRONMENT = $(LIBTOOL) --mode=execute $(VALGRIND_COMMAND)
+
+TESTS =
+if HAVE_GTEST
+TESTS += run_unittests
+run_unittests_SOURCES  = run_unittests.cc
+run_unittests_SOURCES += io_fetch_unittest.cc
+
+run_unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES)
+
+run_unittests_LDADD  = $(top_builddir)/src/lib/asiodns/libkea-asiodns.la
+run_unittests_LDADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+run_unittests_LDADD += $(top_builddir)/src/lib/dns/libkea-dns++.la
+run_unittests_LDADD += $(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la
+run_unittests_LDADD += $(top_builddir)/src/lib/log/libkea-log.la
+run_unittests_LDADD += $(top_builddir)/src/lib/util/unittests/libutil_unittests.la
+run_unittests_LDADD += $(top_builddir)/src/lib/util/libkea-util.la
+run_unittests_LDADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+run_unittests_LDADD += $(LOG4CPLUS_LIBS) $(CRYPTO_LIBS)
+run_unittests_LDADD += $(BOOST_LIBS) $(GTEST_LDADD)
+
+run_unittests_LDFLAGS = $(AM_LDFLAGS) $(CRYPTO_LDFLAGS) $(GTEST_LDFLAGS)
+
+# Note: the ordering matters: -Wno-... must follow -Wextra (defined in
+# KEA_CXXFLAGS)
+run_unittests_CXXFLAGS = $(AM_CXXFLAGS)
+if USE_GXX
+run_unittests_CXXFLAGS += -Wno-unused-parameter
+endif
+endif
+
+noinst_PROGRAMS = $(TESTS)
diff --git a/src/lib/asiodns/tests/Makefile.in b/src/lib/asiodns/tests/Makefile.in
new file mode 100644
index 0000000..56728c7
--- /dev/null
+++ b/src/lib/asiodns/tests/Makefile.in
@@ -0,0 +1,896 @@
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+
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+
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+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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+
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+
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diff --git a/src/lib/asiodns/tests/io_fetch_unittest.cc b/src/lib/asiodns/tests/io_fetch_unittest.cc
new file mode 100644
index 0000000..628e8fd
--- /dev/null
+++ b/src/lib/asiodns/tests/io_fetch_unittest.cc
@@ -0,0 +1,738 @@
+// Copyright (C) 2011-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/io_address.h>
+#include <asiolink/io_endpoint.h>
+#include <asiolink/io_service.h>
+#include <asiodns/io_fetch.h>
+#include <dns/question.h>
+#include <dns/message.h>
+#include <dns/messagerenderer.h>
+#include <dns/opcode.h>
+#include <dns/name.h>
+#include <dns/rcode.h>
+#include <util/buffer.h>
+#include <util/io_utilities.h>
+
+#include <gtest/gtest.h>
+#include <boost/date_time/posix_time/posix_time_types.hpp>
+
+#include <algorithm>
+#include <cstdlib>
+#include <functional>
+#include <string>
+#include <iostream>
+#include <iomanip>
+#include <iterator>
+#include <vector>
+
+using namespace boost::asio::ip;
+using namespace boost::asio;
+using namespace isc::asiolink;
+using namespace isc::dns;
+using namespace isc::util;
+using namespace std;
+namespace ph = std::placeholders;
+
+namespace isc {
+namespace asiodns {
+
+const boost::asio::ip::address TEST_HOST(boost::asio::ip::address::from_string("127.0.0.1"));
+const uint16_t TEST_PORT(5301);
+const int SEND_INTERVAL = 250;      // Interval in ms between TCP sends
+const size_t MAX_SIZE = 64 * 1024;  // Should be able to take 64kB
+
+// The tests are complex, so debug output has been left in (although disabled).
+// Set this to true to enable it.
+const bool DEBUG = false;
+
+/// \brief Test fixture for the asiolink::IOFetch.
+class IOFetchTest : public virtual ::testing::Test, public virtual IOFetch::Callback
+{
+public:
+    IOService       service_;       ///< Service to run the query
+    IOFetch::Result expected_;      ///< Expected result of the callback
+    bool            run_;           ///< Did the callback run already?
+    Question        question_;      ///< What to ask
+    OutputBufferPtr result_buff_;   ///< Buffer to hold result of fetch
+    OutputBufferPtr msgbuf_;        ///< Buffer corresponding to known question
+    IOFetch         udp_fetch_;     ///< For UDP query test
+    IOFetch         tcp_fetch_;     ///< For TCP query test
+    IOFetch::Protocol protocol_;    ///< Protocol being tested
+    size_t          cumulative_;    ///< Cumulative data received by "server".
+    deadline_timer  timer_;         ///< Timer to measure timeouts
+
+    // The next member is the buffer in which the "server" (implemented by the
+    // response handler methods in this class) receives the question sent by the
+    // fetch object.
+    uint8_t         receive_buffer_[MAX_SIZE]; ///< Server receive buffer
+    OutputBufferPtr expected_buffer_;          ///< Data we expect to receive
+    vector<uint8_t> send_buffer_;           ///< Server send buffer
+    uint16_t        send_cumulative_;       ///< Data sent so far
+
+    // Other data.
+    string          return_data_;           ///< Data returned by server
+    string          test_data_;             ///< Large string - here for convenience
+    bool            debug_;                 ///< true to enable debug output
+    size_t          tcp_send_size_;         ///< Max size of TCP send
+    uint8_t         qid_0;                  ///< First octet of qid
+    uint8_t         qid_1;                  ///< Second octet of qid
+
+    bool            tcp_short_send_;        ///< If set to true, we do not send
+                                            ///  all data in the tcp response
+
+    /// \brief Constructor
+    IOFetchTest() :
+        service_(),
+        expected_(IOFetch::NOTSET),
+        run_(false),
+        question_(Name("example.net"), RRClass::IN(), RRType::A()),
+        result_buff_(new OutputBuffer(512)),
+        msgbuf_(new OutputBuffer(512)),
+        udp_fetch_(IOFetch::UDP, service_, question_, IOAddress(TEST_HOST),
+            TEST_PORT, result_buff_, this, 100),
+        tcp_fetch_(IOFetch::TCP, service_, question_, IOAddress(TEST_HOST),
+            TEST_PORT, result_buff_, this, (24 * SEND_INTERVAL)),
+                                        // Timeout interval chosen to ensure no timeout
+        protocol_(IOFetch::TCP),        // for initialization - will be changed
+        cumulative_(0),
+        timer_(service_.get_io_service()),
+        receive_buffer_(),
+        expected_buffer_(new OutputBuffer(512)),
+        send_buffer_(),
+        send_cumulative_(0),
+        return_data_(""),
+        test_data_(""),
+        debug_(DEBUG),
+        tcp_send_size_(0),
+        qid_0(0),
+        qid_1(0),
+        tcp_short_send_(false)
+    {
+        // Construct the data buffer for question we expect to receive.
+        Message msg(Message::RENDER);
+        msg.setQid(0);
+        msg.setOpcode(Opcode::QUERY());
+        msg.setRcode(Rcode::NOERROR());
+        msg.setHeaderFlag(Message::HEADERFLAG_RD);
+        msg.addQuestion(question_);
+        EDNSPtr msg_edns(new EDNS());
+        msg_edns->setUDPSize(Message::DEFAULT_MAX_EDNS0_UDPSIZE);
+        msg.setEDNS(msg_edns);
+
+        MessageRenderer renderer;
+        renderer.setBuffer(msgbuf_.get());
+        msg.toWire(renderer);
+        renderer.setBuffer(NULL);
+
+        renderer.setBuffer(expected_buffer_.get());
+        msg.toWire(renderer);
+        renderer.setBuffer(NULL);
+
+        // Initialize the test data to be returned: tests will return a
+        // substring of this data. (It's convenient to have this as a member of
+        // the class.)
+        //
+        // We could initialize the data with a single character, but as an added
+        // check we'll make ssre that it has some structure.
+
+        test_data_.clear();
+        test_data_.reserve(MAX_SIZE);
+        while (test_data_.size() < MAX_SIZE) {
+            test_data_ += "A message to be returned to the client that has "
+                          "some sort of structure.";
+        }
+    }
+
+    /// \brief UDP Response handler (the "remote UDP DNS server")
+    ///
+    /// When IOFetch is sending data, this response handler emulates the remote
+    /// DNS server.  It checks that the data sent by the IOFetch object is what
+    /// was expected to have been sent, then sends back a known buffer of data.
+    ///
+    /// \param remote Endpoint to which to send the answer
+    /// \param socket Socket to use to send the answer
+    /// \param ec ASIO error code, completion code of asynchronous I/O issued
+    ///        by the "server" to receive data.
+    /// \param bad_qid If set to true, the QID in the response will be mangled
+    /// \param second_send If set to true, (and bad_qid is too), after the
+    ///        mangled qid response has been sent, a second packet will be
+    ///        sent with the correct QID.
+    /// \param length Amount of data received.
+    void udpReceiveHandler(udp::endpoint* remote, udp::socket* socket,
+                           boost::system::error_code ec = boost::system::error_code(),
+                           size_t length = 0, bool bad_qid = false,
+                           bool second_send = false)
+    {
+        if (debug_) {
+            cout << "udpReceiveHandler(): error = " << ec.value() <<
+                    ", length = " << length << endl;
+        }
+
+        // The QID in the incoming data is random so set it to 0 for the
+        // data comparison check. (It is set to 0 in the buffer containing
+        // the expected data.)
+        qid_0 = receive_buffer_[0];
+        qid_1 = receive_buffer_[1];
+        receive_buffer_[0] = receive_buffer_[1] = 0;
+
+        // Check that length of the received data and the expected data are
+        // identical, then check that the data is identical as well.
+        EXPECT_EQ(msgbuf_->getLength(), length);
+        EXPECT_TRUE(equal(receive_buffer_, (receive_buffer_ + length - 1),
+        static_cast<const uint8_t*>(msgbuf_->getData())));
+
+        // Return a message back to the IOFetch object.
+        if (!bad_qid) {
+            expected_buffer_->writeUint8At(qid_0, 0);
+            expected_buffer_->writeUint8At(qid_1, 1);
+        } else {
+            expected_buffer_->writeUint8At(qid_0 + 1, 0);
+            expected_buffer_->writeUint8At(qid_1 + 1, 1);
+        }
+        socket->send_to(boost::asio::buffer(expected_buffer_->getData(), length), *remote);
+
+        if (bad_qid && second_send) {
+            expected_buffer_->writeUint8At(qid_0, 0);
+            expected_buffer_->writeUint8At(qid_1, 1);
+            socket->send_to(boost::asio::buffer(expected_buffer_->getData(),
+                            expected_buffer_->getLength()), *remote);
+        }
+        if (debug_) {
+            cout << "udpReceiveHandler(): returned " << expected_buffer_->getLength() <<
+                    " bytes to the client" << endl;
+        }
+    }
+
+    /// \brief Completion Handler for accepting TCP data
+    ///
+    /// Called when the remote system connects to the "server".  It issues
+    /// an asynchronous read on the socket to read data.
+    ///
+    /// \param socket Socket on which data will be received
+    /// \param ec Boost error code, value should be zero.
+    void tcpAcceptHandler(tcp::socket* socket,
+                          boost::system::error_code ec = boost::system::error_code())
+    {
+        if (debug_) {
+            cout << "tcpAcceptHandler(): error = " << ec.value() << endl;
+        }
+
+        // Expect that the accept completed without a problem.
+        EXPECT_EQ(0, ec.value());
+
+        // Work out the maximum size of data we can send over it when we
+        // respond, then subtract 1kB or so for safety.
+        tcp::socket::send_buffer_size send_size;
+        socket->get_option(send_size);
+        if (send_size.value() < (2 * 1024)) {
+            FAIL() << "TCP send size is less than 2kB";
+        } else {
+            tcp_send_size_ = send_size.value() - 1024;
+            if (debug_) {
+                cout << "tcpacceptHandler(): will use send size = " << tcp_send_size_ << endl;
+            }
+        }
+
+        // Initiate a read on the socket.
+        cumulative_ = 0;
+        socket->async_receive(boost::asio::buffer(receive_buffer_, sizeof(receive_buffer_)),
+            std::bind(&IOFetchTest::tcpReceiveHandler, this, socket, ph::_1, ph::_2));
+    }
+
+    /// \brief Completion handler for receiving TCP data
+    ///
+    /// When IOFetch is sending data, this response handler emulates the remote
+    /// DNS server.  It that all the data sent by the IOFetch object has been
+    /// received, issuing another read if not.  If the data is complete, it is
+    /// compared to what is expected and a reply sent back to the IOFetch.
+    ///
+    /// \param socket Socket to use to send the answer
+    /// \param ec ASIO error code, completion code of asynchronous I/O issued
+    ///        by the "server" to receive data.
+    /// \param length Amount of data received.
+    void tcpReceiveHandler(tcp::socket* socket,
+                           boost::system::error_code ec = boost::system::error_code(),
+                           size_t length = 0)
+    {
+        if (debug_) {
+            cout << "tcpReceiveHandler(): error = " << ec.value() <<
+                    ", length = " << length << endl;
+        }
+        // Expect that the receive completed without a problem.
+        EXPECT_EQ(0, ec.value());
+
+        // If we haven't received all the data, issue another read.
+        cumulative_ += length;
+        bool complete = false;
+        if (cumulative_ > 2) {
+            uint16_t dns_length = readUint16(receive_buffer_,
+                                             sizeof(receive_buffer_));
+            complete = ((dns_length + 2) == cumulative_);
+        }
+
+        if (!complete) {
+            socket->async_receive(boost::asio::buffer((receive_buffer_ + cumulative_),
+                (sizeof(receive_buffer_) - cumulative_)),
+                std::bind(&IOFetchTest::tcpReceiveHandler, this, socket, ph::_1, ph::_2));
+            return;
+        }
+
+        // Check that length of the DNS message received is that expected, then
+        // compare buffers, zeroing the QID in the received buffer to match
+        // that set in our expected question.  Note that due to the length
+        // field the QID in the received buffer is in the third and fourth
+        // bytes.
+        EXPECT_EQ(msgbuf_->getLength() + 2, cumulative_);
+        qid_0 = receive_buffer_[2];
+        qid_1 = receive_buffer_[3];
+
+        receive_buffer_[2] = receive_buffer_[3] = 0;
+        EXPECT_TRUE(equal((receive_buffer_ + 2), (receive_buffer_ + cumulative_ - 2),
+            static_cast<const uint8_t*>(msgbuf_->getData())));
+
+        // ... and return a message back.  This has to be preceded by a two-byte
+        // count field.
+
+        send_buffer_.clear();
+        send_buffer_.push_back(0);
+        send_buffer_.push_back(0);
+        // send_buffer_.capacity() seems more logical below, but the
+        // code above fills in the first two bytes and size() becomes 2
+        // (sizeof uint16_t).
+        writeUint16(return_data_.size(), &send_buffer_[0], send_buffer_.size());
+        copy(return_data_.begin(), return_data_.end(), back_inserter(send_buffer_));
+        if (return_data_.size() >= 2) {
+            send_buffer_[2] = qid_0;
+            send_buffer_[3] = qid_1;
+        }
+        // Send the data.  This is done in multiple writes with a delay between
+        // each to check that the reassembly of TCP packets from fragments works.
+        send_cumulative_ = 0;
+        tcpSendData(socket);
+    }
+
+    /// \brief Sent Data Over TCP
+    ///
+    /// Send the TCP data back to the IOFetch object.  The data is sent in
+    /// three chunks - two of 16 bytes and the remainder, with a 250ms gap
+    /// between each. (Amounts of data smaller than one 32 bytes are sent in
+    /// one or two packets.)
+    ///
+    /// \param socket Socket over which send should take place
+    void tcpSendData(tcp::socket* socket) {
+        if (debug_) {
+            cout << "tcpSendData()" << endl;
+        }
+
+        // Decide what to send based on the cumulative count.  At most we'll do
+        // two chunks of 16 bytes (with a 250ms gap between) and then the
+        // remainder.
+        uint8_t* send_ptr = &send_buffer_[send_cumulative_];
+                                    // Pointer to data to send
+        size_t amount = 16;         // Amount of data to send
+        if (send_cumulative_ < (2 * amount)) {
+
+            // First or second time through, send at most 16 bytes
+            amount = min(amount, (send_buffer_.size() - send_cumulative_));
+
+        } else {
+
+            // For all subsequent times, send the remainder, maximised to
+            // whatever we have chosen for the maximum send size.
+            amount = min(tcp_send_size_,
+                        (send_buffer_.size() - send_cumulative_));
+        }
+
+        // This is for the short send test; reduce the actual amount of
+        // data we send
+        if (tcp_short_send_) {
+            if (debug_) {
+                cout << "tcpSendData(): sending incomplete data (" <<
+                        (amount - 1) << " of " << amount << " bytes)" <<
+                        endl;
+            }
+            --amount;
+        } else {
+            if (debug_) {
+                cout << "tcpSendData(): sending " << amount << " bytes" << endl;
+            }
+        }
+
+        // ... and send it.  The amount sent is also passed as the first
+        // argument of the send callback, as a check.
+        socket->async_send(boost::asio::buffer(send_ptr, amount),
+                           std::bind(&IOFetchTest::tcpSendHandler, this,
+                                     amount, socket, ph::_1, ph::_2));
+    }
+
+    /// \brief Completion Handler for Sending TCP data
+    ///
+    /// Called when the asynchronous send of data back to the IOFetch object
+    /// by the TCP "server" in this class has completed.  (This send has to
+    /// be asynchronous because control needs to return to the caller in order
+    /// for the IOService "run()" method to be called to run the handlers.)
+    ///
+    /// If not all the data has been sent, a short delay is instigated (during
+    /// which control returns to the IOService).  This should force the queued
+    /// data to actually be sent and the IOFetch receive handler to be triggered.
+    /// In this way, the ability of IOFetch to handle fragmented TCP packets
+    /// should be checked.
+    ///
+    /// \param expected Number of bytes that were expected to have been sent.
+    /// \param socket Socket over which the send took place.  Only used to
+    ///        pass back to the send method.
+    /// \param ec Boost error code, value should be zero.
+    /// \param length Number of bytes sent.
+    void tcpSendHandler(size_t expected, tcp::socket* socket,
+                        boost::system::error_code ec = boost::system::error_code(),
+                        size_t length = 0)
+    {
+        if (debug_) {
+            cout << "tcpSendHandler(): error = " << ec.value() <<
+                    ", length = " << length << endl;
+        }
+
+        EXPECT_EQ(0, ec.value());       // Expect no error
+        EXPECT_EQ(expected, length);    // And that amount sent is as expected
+
+        // Do we need to send more?
+        send_cumulative_ += length;
+        if (send_cumulative_ < send_buffer_.size()) {
+
+            // Yes - set up a timer:  the callback handler for the timer is
+            // tcpSendData, which will then send the next chunk.  We pass the
+            // socket over which data should be sent as an argument to that
+            // function.
+            timer_.expires_from_now(boost::posix_time::milliseconds(SEND_INTERVAL));
+            timer_.async_wait(std::bind(&IOFetchTest::tcpSendData, this,
+                                        socket));
+        }
+    }
+
+    /// \brief Fetch completion callback
+    ///
+    /// This is the callback's operator() method which is called when the fetch
+    /// is complete.  It checks that the data received is the wire format of the
+    /// data sent back by the server.
+    ///
+    /// \param result Result indicated by the callback
+    void operator()(IOFetch::Result result) {
+        if (debug_) {
+            cout << "operator()(): result = " << result << endl;
+        }
+
+        EXPECT_EQ(expected_, result);   // Check correct result returned
+        EXPECT_FALSE(run_);             // Check it is run only once
+        run_ = true;                    // Note success
+
+        // If the expected result for SUCCESS, then this should have been called
+        // when one of the "servers" in this class has sent back return_data_.
+        // Check the data is as expected/
+        if (expected_ == IOFetch::SUCCESS) {
+            // In the case of UDP, we actually send back a real looking packet
+            // in the case of TCP, we send back a 'random' string
+            if (protocol_ == IOFetch::UDP) {
+                EXPECT_EQ(expected_buffer_->getLength(), result_buff_->getLength());
+                EXPECT_EQ(0, memcmp(expected_buffer_->getData(), result_buff_->getData(),
+                          expected_buffer_->getLength()));
+            } else {
+                EXPECT_EQ(return_data_.size(), result_buff_->getLength());
+                // Overwrite the random qid with our own data for the
+                // comparison to succeed
+                if (result_buff_->getLength() >= 2) {
+                    result_buff_->writeUint8At(return_data_[0], 0);
+                    result_buff_->writeUint8At(return_data_[1], 1);
+                }
+                const uint8_t* start = static_cast<const uint8_t*>(result_buff_->getData());
+                EXPECT_TRUE(equal(return_data_.begin(), return_data_.end(), start));
+            }
+        }
+
+        // ... and cause the run loop to exit.
+        service_.stop();
+    }
+
+    // The next set of methods are the tests themselves.  A number of the TCP
+    // and UDP tests are very similar.
+
+    /// \brief Check for stop()
+    ///
+    /// Test that when we run the query and stop it after it was run, it returns
+    /// "stopped" correctly. (That is why stop() is posted to the service_ as
+    /// well instead of calling it.)
+    ///
+    /// \param protocol Test protocol
+    /// \param fetch Fetch object being tested
+    void stopTest(IOFetch::Protocol protocol, IOFetch& fetch) {
+        protocol_ = protocol;
+        expected_ = IOFetch::STOPPED;
+
+        // Post the query
+        service_.get_io_service().post(fetch);
+
+        // Post query_.stop() (yes, the std::bind thing is just
+        // query_.stop()).
+        service_.get_io_service().post(
+            std::bind(&IOFetch::stop, fetch, IOFetch::STOPPED));
+
+        // Run both of them.  run() returns when everything in the I/O service
+        // queue has completed.
+        service_.run();
+        EXPECT_TRUE(run_);
+    }
+
+    /// \brief Premature stop test
+    ///
+    /// Test that when we queue the query to service_ and call stop() before it
+    /// gets executed, it acts sanely as well (eg. has the same result as
+    /// running stop() after - calls the callback).
+    ///
+    /// \param protocol Test protocol
+    /// \param fetch Fetch object being tested
+    void prematureStopTest(IOFetch::Protocol protocol, IOFetch& fetch) {
+        protocol_ = protocol;
+        expected_ = IOFetch::STOPPED;
+
+        // Stop before it is started
+        fetch.stop();
+        service_.get_io_service().post(fetch);
+
+        service_.run();
+        EXPECT_TRUE(run_);
+    }
+
+    /// \brief Timeout test
+    ///
+    /// Test that fetch times out when no answer arrives.
+    ///
+    /// \param protocol Test protocol
+    /// \param fetch Fetch object being tested
+    void timeoutTest(IOFetch::Protocol protocol, IOFetch& fetch) {
+        protocol_ = protocol;
+        expected_ = IOFetch::TIME_OUT;
+
+        service_.get_io_service().post(fetch);
+        service_.run();
+        EXPECT_TRUE(run_);
+    }
+
+    /// \brief Send/Receive Test
+    ///
+    /// Send a query to the server then receives a response.
+    ///
+    /// \param Test data to return to client
+    /// \param short_send If true, do not send all data
+    ///                   (should result in timeout)
+    void tcpSendReturnTest(const std::string& return_data, bool short_send = false) {
+        if (debug_) {
+            cout << "tcpSendReturnTest(): data size = " << return_data.size() << endl;
+        }
+        return_data_ = return_data;
+        protocol_ = IOFetch::TCP;
+        if (short_send) {
+            tcp_short_send_ = true;
+            expected_ = IOFetch::TIME_OUT;
+        } else {
+            expected_ = IOFetch::SUCCESS;
+        }
+
+        // Socket into which the connection will be accepted.
+        tcp::socket socket(service_.get_io_service());
+
+        // Acceptor object - called when the connection is made, the handler
+        // will initiate a read on the socket.
+        tcp::acceptor acceptor(service_.get_io_service(),
+                               tcp::endpoint(tcp::v4(), TEST_PORT));
+        acceptor.async_accept(socket,
+            std::bind(&IOFetchTest::tcpAcceptHandler, this, &socket, ph::_1));
+
+        // Post the TCP fetch object to send the query and receive the response.
+        service_.get_io_service().post(tcp_fetch_);
+
+        // ... and execute all the callbacks.  This exits when the fetch
+        // completes.
+        service_.run();
+        EXPECT_TRUE(run_);  // Make sure the callback did execute
+
+        // Tidy up
+        socket.close();
+    }
+
+    /// Perform a send/receive test over UDP
+    ///
+    /// \param bad_qid If true, do the test where the QID is mangled
+    ///                in the response
+    /// \param second_send If true, do the test where the QID is
+    ///                    mangled in the response, but a second
+    ///                    (correct) packet is used
+    void udpSendReturnTest(bool bad_qid, bool second_send) {
+        protocol_ = IOFetch::UDP;
+
+        // Set up the server.
+        udp::socket socket(service_.get_io_service(), udp::v4());
+        socket.set_option(socket_base::reuse_address(true));
+        socket.bind(udp::endpoint(TEST_HOST, TEST_PORT));
+        return_data_ = "Message returned to the client";
+
+        udp::endpoint remote;
+        socket.async_receive_from(boost::asio::buffer(receive_buffer_,
+                                               sizeof(receive_buffer_)),
+                                  remote,
+                                  std::bind(&IOFetchTest::udpReceiveHandler,
+                                            this, &remote, &socket,
+                                            ph::_1, ph::_2, bad_qid, second_send));
+        service_.get_io_service().post(udp_fetch_);
+        if (debug_) {
+            cout << "udpSendReceive: async_receive_from posted,"
+                "waiting for callback" << endl;
+        }
+        service_.run();
+
+        socket.close();
+
+        EXPECT_TRUE(run_);
+    }
+};
+
+// Check the protocol
+TEST_F(IOFetchTest, Protocol) {
+    EXPECT_EQ(IOFetch::UDP, udp_fetch_.getProtocol());
+    EXPECT_EQ(IOFetch::TCP, tcp_fetch_.getProtocol());
+}
+
+// UDP Stop test - see IOFetchTest::stopTest() header.
+TEST_F(IOFetchTest, UdpStop) {
+    stopTest(IOFetch::UDP, udp_fetch_);
+}
+
+// UDP premature stop test - see IOFetchTest::prematureStopTest() header.
+TEST_F(IOFetchTest, UdpPrematureStop) {
+    prematureStopTest(IOFetch::UDP, udp_fetch_);
+}
+
+// UDP premature stop test - see IOFetchTest::timeoutTest() header.
+TEST_F(IOFetchTest, UdpTimeout) {
+    timeoutTest(IOFetch::UDP, udp_fetch_);
+}
+
+// UDP SendReceive test.  Set up a UDP server then ports a UDP fetch object.
+// This will send question_ to the server and receive the answer back from it.
+TEST_F(IOFetchTest, UdpSendReceive) {
+    expected_ = IOFetch::SUCCESS;
+
+    udpSendReturnTest(false, false);
+
+    EXPECT_TRUE(run_);;
+}
+
+TEST_F(IOFetchTest, UdpSendReceiveBadQid) {
+    expected_ = IOFetch::TIME_OUT;
+
+    udpSendReturnTest(true, false);
+
+    EXPECT_TRUE(run_);;
+}
+
+TEST_F(IOFetchTest, UdpSendReceiveBadQidResend) {
+    expected_ = IOFetch::SUCCESS;
+
+    udpSendReturnTest(true, true);
+
+    EXPECT_TRUE(run_);;
+}
+
+// Do the same tests for TCP transport
+
+TEST_F(IOFetchTest, TcpStop) {
+    stopTest(IOFetch::TCP, tcp_fetch_);
+}
+
+TEST_F(IOFetchTest, TcpPrematureStop) {
+    prematureStopTest(IOFetch::TCP, tcp_fetch_);
+}
+
+TEST_F(IOFetchTest, TcpTimeout) {
+    timeoutTest(IOFetch::TCP, tcp_fetch_);
+}
+
+// Test with values at or near 2, then at or near the chunk size (16 and 32
+// bytes, the sizes of the first two packets) then up to 65535.  These are done
+// in separate tests because in practice a new IOFetch is created for each
+// query/response exchange and we don't want to confuse matters in the test
+// by running the test with an IOFetch that has already done one exchange.
+//
+// Don't do 0 or 1; the server would not accept the packet
+// (since the length is too short to check the qid)
+TEST_F(IOFetchTest, TcpSendReceive2) {
+    tcpSendReturnTest(test_data_.substr(0, 2));
+}
+
+TEST_F(IOFetchTest, TcpSendReceive3) {
+    tcpSendReturnTest(test_data_.substr(0, 3));
+}
+
+TEST_F(IOFetchTest, TcpSendReceive15) {
+    tcpSendReturnTest(test_data_.substr(0, 15));
+}
+
+TEST_F(IOFetchTest, TcpSendReceive16) {
+    tcpSendReturnTest(test_data_.substr(0, 16));
+}
+
+TEST_F(IOFetchTest, TcpSendReceive17) {
+    tcpSendReturnTest(test_data_.substr(0, 17));
+}
+
+TEST_F(IOFetchTest, TcpSendReceive31) {
+    tcpSendReturnTest(test_data_.substr(0, 31));
+}
+
+TEST_F(IOFetchTest, TcpSendReceive32) {
+    tcpSendReturnTest(test_data_.substr(0, 32));
+}
+
+TEST_F(IOFetchTest, TcpSendReceive33) {
+    tcpSendReturnTest(test_data_.substr(0, 33));
+}
+
+TEST_F(IOFetchTest, TcpSendReceive4096) {
+    tcpSendReturnTest(test_data_.substr(0, 4096));
+}
+
+TEST_F(IOFetchTest, TcpSendReceive8192) {
+    tcpSendReturnTest(test_data_.substr(0, 8192));
+}
+
+TEST_F(IOFetchTest, TcpSendReceive16384) {
+    tcpSendReturnTest(test_data_.substr(0, 16384));
+}
+
+TEST_F(IOFetchTest, TcpSendReceive32768) {
+    tcpSendReturnTest(test_data_.substr(0, 32768));
+}
+
+TEST_F(IOFetchTest, TcpSendReceive65535) {
+    tcpSendReturnTest(test_data_.substr(0, 65535));
+}
+
+TEST_F(IOFetchTest, TcpSendReceive2ShortSend) {
+    tcpSendReturnTest(test_data_.substr(0, 2), true);
+}
+
+TEST_F(IOFetchTest, TcpSendReceive15ShortSend) {
+    tcpSendReturnTest(test_data_.substr(0, 15), true);
+}
+
+TEST_F(IOFetchTest, TcpSendReceive8192ShortSend) {
+    tcpSendReturnTest(test_data_.substr(0, 8192), true);
+}
+
+
+} // namespace asiodns
+} // namespace isc
diff --git a/src/lib/asiodns/tests/run_unittests.cc b/src/lib/asiodns/tests/run_unittests.cc
new file mode 100644
index 0000000..5d71cc9
--- /dev/null
+++ b/src/lib/asiodns/tests/run_unittests.cc
@@ -0,0 +1,21 @@
+// Copyright (C) 2009-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+#include <util/unittests/run_all.h>
+
+#include <log/logger_support.h>
+
+int
+main(int argc, char* argv[])
+{
+    ::testing::InitGoogleTest(&argc, argv);         // Initialize Google test
+    isc::log::initLogger();                         // Initialize logging
+
+    return (isc::util::unittests::run_all());
+}
author	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-13 12:15:43 +0000
committer	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-13 12:15:43 +0000
commit	f5f56e1a1c4d9e9496fcb9d81131066a964ccd23 (patch)
tree	49e44c6f87febed37efb953ab5485aa49f6481a7 /src/lib/asiodns
parent	Initial commit. (diff)
download	isc-kea-f5f56e1a1c4d9e9496fcb9d81131066a964ccd23.tar.xz isc-kea-f5f56e1a1c4d9e9496fcb9d81131066a964ccd23.zip