started dns protocol implementation

mio/Makefile.in

@@ -347,7 +347,6 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
-runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
@@ -578,7 +577,7 @@ distdir: $(DISTFILES)
 	  ! -type d ! -perm -444 -exec $(install_sh) -c -m a+r {} {} \; \
 	|| chmod -R a+r "$(distdir)"
 dist-gzip: distdir
-	tardir=$(distdir) && $(am__tar) | GZIP=$(GZIP_ENV) gzip -c >$(distdir).tar.gz
+	tardir=$(distdir) && $(am__tar) | eval GZIP= gzip $(GZIP_ENV) -c >$(distdir).tar.gz
 	$(am__post_remove_distdir)
 
 dist-bzip2: distdir
@@ -604,7 +603,7 @@ dist-shar: distdir
 	@echo WARNING: "Support for shar distribution archives is" \
 	               "deprecated." >&2
 	@echo WARNING: "It will be removed altogether in Automake 2.0" >&2
-	shar $(distdir) | GZIP=$(GZIP_ENV) gzip -c >$(distdir).shar.gz
+	shar $(distdir) | eval GZIP= gzip $(GZIP_ENV) -c >$(distdir).shar.gz
 	$(am__post_remove_distdir)
 
 dist-zip: distdir
@@ -622,7 +621,7 @@ dist dist-all:
 distcheck: dist
 	case '$(DIST_ARCHIVES)' in \
 	*.tar.gz*) \
-	  GZIP=$(GZIP_ENV) gzip -dc $(distdir).tar.gz | $(am__untar) ;;\
+	  eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).tar.gz | $(am__untar) ;;\
 	*.tar.bz2*) \
 	  bzip2 -dc $(distdir).tar.bz2 | $(am__untar) ;;\
 	*.tar.lz*) \
@@ -632,7 +631,7 @@ distcheck: dist
 	*.tar.Z*) \
 	  uncompress -c $(distdir).tar.Z | $(am__untar) ;;\
 	*.shar.gz*) \
-	  GZIP=$(GZIP_ENV) gzip -dc $(distdir).shar.gz | unshar ;;\
+	  eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).shar.gz | unshar ;;\
 	*.zip*) \
 	  unzip $(distdir).zip ;;\
 	esac

mio/configure

@@ -771,7 +771,6 @@ infodir
 docdir
 oldincludedir
 includedir
-runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -862,7 +861,6 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
-runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1115,15 +1113,6 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
-  -runstatedir | --runstatedir | --runstatedi | --runstated \
-  | --runstate | --runstat | --runsta | --runst | --runs \
-  | --run | --ru | --r)
-    ac_prev=runstatedir ;;
-  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
-  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
-  | --run=* | --ru=* | --r=*)
-    runstatedir=$ac_optarg ;;
-
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1261,7 +1250,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir runstatedir
+		libdir localedir mandir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1414,7 +1403,6 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
-  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]

mio/lib/Makefile.am

@@ -22,6 +22,7 @@ LIBADD_LIB_COMMON = $(LIBM) $(LIBLTDL)
 include_HEADERS = \
 	mio-cfg.h \
 	mio-cmn.h \
+	mio-dns.h \
 	mio-pro.h \
 	mio-sck.h \
 	mio-utl.h \

mio/lib/Makefile.in

@@ -365,7 +365,6 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
-runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
@@ -395,6 +394,7 @@ LIBADD_LIB_COMMON = $(LIBM) $(LIBLTDL)
 include_HEADERS = \
 	mio-cfg.h \
 	mio-cmn.h \
+	mio-dns.h \
 	mio-pro.h \
 	mio-sck.h \
 	mio-utl.h \

mio/lib/mio-dns.h

@@ -0,0 +1,90 @@
+/*
+ * $Id$
+ *
+    Copyright (c) 2015-2016 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAfRRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _MIO_DNS_H_
+#define _MIO_DNS_H_
+
+#include <mio.h>
+
+#define MIO_DNS_PORT (53)
+
+enum mio_dns_opcode_t
+{
+	MIO_DNS_OPCODE_QUERY = 0, /* standard query */
+	MIO_DNS_OPCODE_IQUERY = 1, /* inverse query */
+	MIO_DNS_OPCODE_STATUS = 2, /* status request */
+	/* 3 unassigned */
+	MIO_DNS_OPCODE_NOTIFY = 4,
+	MIO_DNS_OPCODE_UPDATE = 5
+};
+typedef enum mio_dns_opcode_t mio_dns_opcode_t;
+
+enum mio_dns_rcode_t
+{
+	MIO_DNS_RCODE_NOERROR   = 0,
+	MIO_DNS_RCODE_FORMERR   = 1,  /* format error */
+	MIO_DNS_RCODE_SERVFAIL  = 2,  /* server failure */
+	MIO_DNS_RCODE_NXDOMAIN  = 3,  /* non-existent domain */
+	MIO_DNS_RCODE_NOTIMPL   = 4,  /* not implemented */
+	MIO_DNS_RCODE_REFUSED   = 5,  /* query refused */
+	MIO_DNS_RCODE_YXDOMAIN  = 6,  /* name exists when it should not */
+	MIO_DNS_RCODE_YXRRSET   = 7,  /* RR set exists when it should not */
+	MIO_DNS_RCODE_NXRRSET   = 8,  /* RR set exists when it should not */
+	MIO_DNS_RCODE_NOTAUTH   = 9,  /* not authorized or server not authoritative for zone*/
+	MIO_DNS_RCODE_NOTZONE   = 10, /* name not contained in zone */
+	MIO_DNS_RCODE_BADVERS   = 16,
+	MIO_DNS_RCODE_BADSIG    = 17,
+	MIO_DNS_RCODE_BADTIME   = 18,
+	MIO_DNS_RCODE_BADMODE   = 19,
+	MIO_DNS_RCODE_BADNAME   = 20,
+	MIO_DNS_RCODE_BADALG    = 21,
+	MIO_DNS_RCODE_BADTRUNC  = 22,
+	MIO_DNS_RCODE_BADCOOKIE = 23
+};
+typedef enum mio_dns_rcode_t mio_dns_rcode_t;
+
+struct mio_dns_msg_t
+{
+	mio_uint16_t id;
+	mio_uint16_t qr: 1; /* query(0), answer(1) */
+	mio_uint16_t opcode: 4; /* operation type */
+	mio_uint16_t aa: 1; /* authoritative answer */
+	mio_uint16_t tc: 1; /* truncated. response too large for UDP */
+	mio_uint16_t rd: 1; /* recursion desired */
+	mio_uint16_t ra: 1; /* recursion available */
+	mio_uint16_t unused_1: 1;
+	mio_uint16_t ad: 1; /* authentication data - dnssec */
+	mio_uint16_t cd: 1; /* checking disabled - dnssec */
+	mio_uint16_t rcode: 4;
+	mio_uint16_t qdcount;
+	mio_uint16_t ancount;
+	mio_uint16_t nscount;
+	mio_uint16_t arcount;
+};
+
+typedef struct mio_dns_msg_t mio-dns
+
+#endif