Import Debian changes 1:0.88-3

ucspi-tcp (1:0.88-3) unstable; urgency=low * ucspi-tcp-ipv6/diff/0001-rblsmtpd.c...diff, 0002-Makefile...diff, 0003-Apply-fefe-s-ucspi-tcp-0.88-ipv6.diff19-ipv6-patch.diff: new: ucspi-tcp with IPv6 support added. * debian/control: new package ucspi-tcp-ipv6: ucspi-tcp with IPv6 support added (thx fefe; closes: #534925). * debian/rules: build and install new package ucspi-tcp-ipv6.
author: Gerrit Pape <pape@smarden.org> 2009-10-13 22:57:51 +0000
committer: Dmitry Bogatov <KAction@debian.org> 2018-11-29 05:18:33 +0000
commit: 14d23cfcb6ead69c05e2e36c854b33e27aa44787 (patch)
tree: da65c5de16bc0779936fa6bf8c28be1a596569e9
parent: d98777c7f350bf18c2673e312ae1f9adb4d16eec (diff)
6 files changed, 4966 insertions, 9 deletions
diff --git a/debian/changelog b/debian/changelog
index 9ff4269..79c1399 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,14 @@
+ucspi-tcp (1:0.88-3) unstable; urgency=low
+
+  * ucspi-tcp-ipv6/diff/0001-rblsmtpd.c...diff, 0002-Makefile...diff,
+    0003-Apply-fefe-s-ucspi-tcp-0.88-ipv6.diff19-ipv6-patch.diff: new:
+    ucspi-tcp with IPv6 support added.
+  * debian/control: new package ucspi-tcp-ipv6: ucspi-tcp with IPv6
+    support added (thx fefe; closes: #534925).
+  * debian/rules: build and install new package ucspi-tcp-ipv6.
+
+ -- Gerrit Pape <pape@smarden.org>  Tue, 13 Oct 2009 22:57:51 +0000
+
 ucspi-tcp (1:0.88-2) unstable; urgency=low
 
   * debian/rules: install: force remove also auto_home.c before re-doing
diff --git a/debian/control b/debian/control
index 069b760..4e38073 100644
--- a/debian/control
+++ b/debian/control
@@ -35,3 +35,38 @@ Description: command-line tools for building TCP client-server applications
  tcpserver and tcpclient conform to UCSPI, the UNIX Client-Server Program
  Interface, using the TCP protocol. UCSPI tools are
  available for several different networks.
+
+Package: ucspi-tcp-ipv6
+Architecture: any
+Depends: ${shlibs:Depends}
+Replaces: ucspi-tcp-doc
+Conflicts: ucspi-tcp
+Provides: ucspi-tcp
+Description: command-line tools for building TCP client-server applications (IPv6)
+ ucspi-tcp-ipv6 is the ucspi-tcp package with IPv6 support added.
+ .
+ tcpserver waits for incoming connections and, for each connection, runs a
+ program of your choice. Your program receives environment variables showing
+ the local and remote host names, IP addresses, and port numbers.
+ .
+ tcpserver offers a concurrency limit to protect you from running out of
+ processes and memory. When you are handling 40 (by default) simultaneous
+ connections, tcpserver smoothly defers acceptance of new connections.
+ .
+ tcpserver also provides TCP access control features, similar to
+ tcp-wrappers/tcpd's hosts.allow but much faster. Its access control rules
+ are compiled into a hashed format with cdb, so it can easily deal with
+ thousands of different hosts.
+ .
+ This package includes a recordio tool that monitors all the input and output
+ of a server.
+ .
+ tcpclient makes a TCP connection and runs a program of your choice. It sets
+ up the same environment variables as tcpserver.
+ .
+ This package includes several sample clients built on top of tcpclient:
+ who@, date@, finger@, http@, tcpcat, and mconnect.
+ .
+ tcpserver and tcpclient conform to UCSPI, the UNIX Client-Server Program
+ Interface, using the TCP protocol. UCSPI tools are
+ available for several different networks.
diff --git a/debian/rules b/debian/rules
index fbd14ee..fde562a 100755
--- a/debian/rules
+++ b/debian/rules
@@ -6,32 +6,55 @@ ifneq (,$(findstring nostrip,$(DEB_BUILD_OPTIONS)))
 endif
 
 DIR=$(shell pwd)/debian/ucspi-tcp
+DIRIPV6=$(shell pwd)/debian/ucspi-tcp-ipv6
 
-patch: deb-checkdir patch-stamp
-patch-stamp:
+configure: deb-checkdir configure-stamp
+configure-stamp:
+	for i in `cat FILES`; do \
+	  test -r ucspi-tcp-ipv6/$$i || \
+	  cp -p $$i ucspi-tcp-ipv6/$$i || exit 1; \
+	done
+	touch configure-stamp
+
+patch: deb-checkdir patch-stamp ucspi-tcp-ipv6/patch-stamp
+patch-stamp: configure-stamp
 	for i in `ls -1 debian/diff/*.diff || :`; do \
 	  patch -p1 <$$i || exit 1; \
 	done
 	touch patch-stamp
+ucspi-tcp-ipv6/patch-stamp: configure-stamp
+	for i in `ls -1 ucspi-tcp-ipv6/diff/*.diff || :`; do \
+	  (cd ucspi-tcp-ipv6/ && patch -p1) <$$i || exit 1; \
+	done
+	touch ucspi-tcp-ipv6/patch-stamp
 
-build: deb-checkdir build-stamp
+build: deb-checkdir build-stamp ucspi-tcp-ipv6/build-stamp
 build-stamp: patch-stamp
 	test -r conf-home'{orig}' || cp -f conf-home conf-home'{orig}'
 	echo /usr >conf-home
 	$(MAKE)
 	touch build-stamp
+ucspi-tcp-ipv6/build-stamp: ucspi-tcp-ipv6/patch-stamp
+	test -r ucspi-tcp-ipv6/conf-home'{orig}' || \
+	  cp -f ucspi-tcp-ipv6/conf-home ucspi-tcp-ipv6/conf-home'{orig}'
+	echo /usr >ucspi-tcp-ipv6/conf-home
+	$(MAKE) -Cucspi-tcp-ipv6/
+	touch ucspi-tcp-ipv6/build-stamp
 
 clean: deb-checkdir deb-checkuid
 	rm -f `cat TARGETS`
+	for i in ucspi-tcp-ipv6/*; do test -d $$i || rm -f $$i; done
 	test ! -e patch-stamp || \
 	  for i in `ls -1r debian/diff/*.diff || :`; do patch -p1 -R <$$i; done
-	rm -f patch-stamp build-stamp
-	rm -rf '$(DIR)'
+	rm -f configure-stamp patch-stamp build-stamp \
+	  ucspi-tcp-ipv6/patch-stamp ucspi-tcp-ipv6/build-stamp
+	rm -rf '$(DIR)' '$(DIRIPV6)'
 	rm -f debian/files debian/substvars changelog
 	test ! -r conf-home'{orig}' || mv -f conf-home'{orig}' conf-home
 
-install: deb-checkdir deb-checkuid build-stamp
-	rm -rf '$(DIR)'
+install: deb-checkdir deb-checkuid build-stamp ucspi-tcp-ipv6/build-stamp
+	rm -rf '$(DIR)' '$(DIRIPV6)'
+	# ucspi-tcp
 	# programs
 	install -d -m0755 '$(DIR)'/usr/bin
 	test -r conf-home'{orig}' || cp conf-home conf-home'{orig}'
@@ -55,16 +78,56 @@ install: deb-checkdir deb-checkuid build-stamp
 	  install -m0644 $$i '$(DIR)'/usr/share/man/man1/ && \
 	  gzip -9 '$(DIR)'/usr/share/man/man1/$${i##*/} || exit 1; \
 	done
+	# ucspi-tcp-ipv6
+	# programs
+	install -d -m0755 '$(DIRIPV6)'/usr/bin
+	test -r ucspi-tcp-ipv6/conf-home'{orig}' || \
+	  cp ucspi-tcp-ipv6/conf-home ucspi-tcp-ipv6/conf-home'{orig}'
+	echo '$(DIRIPV6)'/usr >ucspi-tcp-ipv6/conf-home
+	for i in install instcheck install.o instcheck.o hier.o auto_home.c \
+	 auto_home.o; do \
+	  rm -f ucspi-tcp-ipv6/$$i; \
+	done
+	$(MAKE) -Cucspi-tcp-ipv6/ install instcheck
+	mv -f ucspi-tcp-ipv6/conf-home'{orig}' ucspi-tcp-ipv6/conf-home
+	(cd ucspi-tcp-ipv6/ && ./install)
+	(cd ucspi-tcp-ipv6/ && ./instcheck)
+	# fix up permissions
+	chmod g-s '$(DIRIPV6)'/usr '$(DIRIPV6)'/usr/bin \
+	  '$(DIRIPV6)'/usr/man '$(DIRIPV6)'/usr/man/man1
+	# strip
+	for i in addcr argv0 delcr fixcrio mconnect-io rblsmtpd recordio \
+	 tcpclient tcprules tcprulescheck tcpserver; do \
+	  $(STRIP) -R .comment -R .note '$(DIRIPV6)'/usr/bin/$$i || exit 1; \
+	done
+	# manpages
+	install -d -m0755 '$(DIRIPV6)'/usr/share
+	rm -rf '$(DIRIPV6)'/usr/man/man5  # don't include tcp-environ(5)
+	mv '$(DIRIPV6)'/usr/man '$(DIRIPV6)'/usr/share/
+	for i in fixcrio.1 rblsmtpd.1 tcpcat.1; do \
+	  install -m0644 debian/ucspi-tcp-man/$$i \
+	    '$(DIRIPV6)'/usr/share/man/man1/; \
+	done
+	for i in '$(DIRIPV6)'/usr/share/man/man1/*.1; do \
+	  gzip -9 $$i || exit 1; \
+	done
 	# changelog
 	test -r changelog || ln -s CHANGES changelog
 
 binary: binary-arch binary-indep
-binary-arch: install ucspi-tcp.deb
+binary-arch: install ucspi-tcp.deb ucspi-tcp-ipv6.deb
+	rm -f debian/substvars
 	dpkg-shlibdeps '$(DIR)'/usr/bin/*
 	dpkg-gencontrol -isp -pucspi-tcp -P'$(DIR)'
 	dpkg -b '$(DIR)' ..
+	rm -f debian/substvars
+	dpkg-shlibdeps '$(DIRIPV6)'/usr/bin/*
+	dpkg-gencontrol -isp -pucspi-tcp-ipv6 -P'$(DIRIPV6)'
+	dpkg -b '$(DIRIPV6)' ..
+
 binary-indep:
 
-.PHONY: patch build clean install binary-indep binary-arch binary
+.PHONY: configure patch ucspi-tcp-ipv6/patch build ucspi-tcp-ipv6/build \
+  clean install binary-indep binary-arch binary
 
 include debian/implicit
diff --git a/ucspi-tcp-ipv6/diff/0001-rblsmtpd.c-don-t-use-a-the-default-rbl.maps.vix.com.diff b/ucspi-tcp-ipv6/diff/0001-rblsmtpd.c-don-t-use-a-the-default-rbl.maps.vix.com.diff
new file mode 100644
index 0000000..d984f18
--- /dev/null
+++ b/ucspi-tcp-ipv6/diff/0001-rblsmtpd.c-don-t-use-a-the-default-rbl.maps.vix.com.diff
@@ -0,0 +1,43 @@
+From d0327e3325837b4aa22198ac090530a3060952ef Mon Sep 17 00:00:00 2001
+From: Gerrit Pape <pape@smarden.org>
+Date: Wed, 9 Jan 2008 07:16:42 +0000
+Subject: [PATCH] rblsmtpd.c: don't use a the default rbl.maps.vix.com if run without -r switch.
+
+rbl.maps.vix.com is obsolete, so don't use it as default rbl if run
+without the -r switch; default to no rbl instead.
+---
+ rblsmtpd.c |    4 +---
+ 1 files changed, 1 insertions(+), 3 deletions(-)
+
+diff --git a/rblsmtpd.c b/rblsmtpd.c
+index cc8ba2e..9695d9e 100644
+--- a/rblsmtpd.c
++++ b/rblsmtpd.c
+@@ -155,7 +155,6 @@ void rblsmtpd(void)
+ 
+ main(int argc,char **argv,char **envp)
+ {
+-  int flagwantdefaultrbl = 1;
+   char *x;
+   int opt;
+ 
+@@ -182,7 +181,7 @@ main(int argc,char **argv,char **envp)
+       case 'c': flagfailclosed = 1; break;
+       case 'C': flagfailclosed = 0; break;
+       case 't': scan_ulong(optarg,&timeout); break;
+-      case 'r': rbl(optarg); flagwantdefaultrbl = 0; break;
++      case 'r': rbl(optarg); break;
+       case 'a': antirbl(optarg); break;
+       default: usage();
+     }
+@@ -190,7 +189,6 @@ main(int argc,char **argv,char **envp)
+   argv += optind;
+   if (!*argv) usage();
+ 
+-  if (flagwantdefaultrbl) rbl("rbl.maps.vix.com");
+   if (decision >= 2) rblsmtpd();
+ 
+   pathexec_run(*argv,argv,envp);
+-- 
+1.6.0.3
+
diff --git a/ucspi-tcp-ipv6/diff/0002-Makefile-target-choose-do-not-depend-on-conf-home.diff b/ucspi-tcp-ipv6/diff/0002-Makefile-target-choose-do-not-depend-on-conf-home.diff
new file mode 100644
index 0000000..d9b4f22
--- /dev/null
+++ b/ucspi-tcp-ipv6/diff/0002-Makefile-target-choose-do-not-depend-on-conf-home.diff
@@ -0,0 +1,27 @@
+From 3be7db918230dde2ce4937f7329d6461b0702d6d Mon Sep 17 00:00:00 2001
+From: Gerrit Pape <pape@smarden.org>
+Date: Wed, 16 Apr 2008 20:56:00 +0000
+Subject: [PATCH] Makefile: target choose: do not depend on conf-home
+
+---
+ Makefile |    3 +--
+ 1 files changed, 1 insertions(+), 2 deletions(-)
+
+diff --git a/Makefile b/Makefile
+index a67b0cb..bcf5bd5 100644
+--- a/Makefile
++++ b/Makefile
+@@ -145,9 +145,8 @@ compile chkshsgr.c exit.h
+ 	./compile chkshsgr.c
+ 
+ choose: \
+-warn-auto.sh choose.sh conf-home
++warn-auto.sh choose.sh
+ 	cat warn-auto.sh choose.sh \
+-	| sed s}HOME}"`head -1 conf-home`"}g \
+ 	> choose
+ 	chmod 755 choose
+ 
+-- 
+1.6.0.3
+
diff --git a/ucspi-tcp-ipv6/diff/0003-Apply-fefe-s-ucspi-tcp-0.88-ipv6.diff19-ipv6-patch.diff b/ucspi-tcp-ipv6/diff/0003-Apply-fefe-s-ucspi-tcp-0.88-ipv6.diff19-ipv6-patch.diff
new file mode 100644
index 0000000..7563bd7
--- /dev/null
+++ b/ucspi-tcp-ipv6/diff/0003-Apply-fefe-s-ucspi-tcp-0.88-ipv6.diff19-ipv6-patch.diff
@@ -0,0 +1,4778 @@
+From 79799b389703e8775f90e9728fa7e9d0dca26739 Mon Sep 17 00:00:00 2001
+From: Gerrit Pape <pape@smarden.org>
+Date: Tue, 13 Oct 2009 22:38:01 +0000
+Subject: [PATCH] Apply fefe's ucspi-tcp-0.88-ipv6.diff19 ipv6 patch
+
+What is ucspi-tcp and why does it need IPv6?
+
+Please see http://cr.yp.to/ucspi-tcp.html for an explanation what
+ucspi-tcp is. Basically, many people use it to replace inetd. It
+consists of tcpserver and tcpclient. tcpserver can listen on sockets and
+start programs in an inetd like fashion except that information like the
+IP address and remote port are communicated via environment variables,
+so writing a server is very easy and the servers are also more portable
+since they don't have to use the socket API directly.
+
+What does your diff do?
+
+The current version adds simple IPv6 support for tcpserver and
+tcpclient.
+
+Note that IPv6 has inherent IPv4 compatibility, so IPv4 connections are
+still possible without having to start a second tcpserver or something
+like that. But since some systems may have IPv6 support in their libc
+but not in the kernel, my tcpserver will always try to create an IPv6
+listening socket but will fall back to transparent IPv4 support. Note
+that this is done by the socket wrappers, not explicitly by tcpserver,
+so to tcpserver the connections look like a normal IPv4 mapped IPv6
+connection.
+
+If a client connects via IPv4 (and you don't use the new -6 option),
+tcpserver will make the environment variables look just like the
+unpatched version. tcpclient also has a -6 option now with the same
+effect.
+
+IPv6 connections use $PROTO=TCP6, so clients can use this to see how
+they should try to parse the IP numbers given in the environment, should
+they feel the need to do so.
+
+There is a new -4 option to tcpclient. I updated the resolver so that
+you can request an IPv6 address for a machine that has only an A record.
+If the lookup for an AAAA record fails, dns_ip6 will do an A lookup and
+convert the address(es) to IP4-mapped IPv6 addresses. If you want
+tcpclient to connect to the IPv4 address even if there is an AAAA
+record, you can use the -4 option to tcpclient.
+
+What does not work yet?
+
+There are quite a few servers using tcpserver out there. If they try to
+parse the IP addresses, they are not IPv6 ready and need to be touched.
+
+Amend:
+	rm -rf usr/
+---
+ FILES                   |   37 +++++++
+ Makefile                |  184 ++++++++++++++++++++++++++++-----
+ TARGETS                 |   28 +++++
+ addcr.1                 |   22 ++++
+ argv0.1                 |   47 ++++++++
+ date@.1                 |   32 ++++++
+ delcr.1                 |   30 ++++++
+ dns.h                   |   63 +++++++-----
+ dns_dfd.c               |   11 +-
+ dns_domain.c            |   36 ++++--
+ dns_dtda.c              |    2 +-
+ dns_ip.c                |    4 +-
+ dns_ip6.c               |  103 ++++++++++++++++++
+ dns_ipq.c               |    6 +-
+ dns_ipq6.c              |   72 +++++++++++++
+ dns_name.c              |   19 +++-
+ dns_nd.c                |    2 +-
+ dns_nd6.c               |   28 +++++
+ dns_packet.c            |    9 +-
+ dns_random.c            |    3 +-
+ dns_rcip.c              |   29 +++---
+ dns_rcrw.c              |    5 +-
+ dns_resolve.c           |    7 +-
+ dns_sortip6.c           |   20 ++++
+ dns_transmit.c          |   71 +++++++------
+ dns_txt.c               |    4 +-
+ error.h                 |    2 +-
+ finger@.1               |   45 ++++++++
+ fixcr.1                 |   11 ++
+ fmt_xlong.c             |   22 ++++
+ haveip6.h1              |    1 +
+ haveip6.h2              |    1 +
+ hier.c                  |   19 ++++
+ http@.1                 |   52 +++++++++
+ ip4.h                   |    2 +
+ ip6.h                   |   28 +++++
+ ip6_fmt.c               |   64 +++++++++++
+ mconnect.1              |   36 +++++++
+ old-rules.c             |  101 ++++++++++++++++++
+ pathexec.h              |    2 +-
+ pathexec_env.c          |    3 +-
+ recordio.1              |   75 +++++++++++++
+ remoteinfo.h            |    1 +
+ remoteinfo6.c           |   98 +++++++++++++++++
+ rules.c                 |    2 +-
+ scan_ip6.c              |   87 +++++++++++++++
+ scan_xlong.c            |   23 ++++
+ socket.h                |   39 ++++++-
+ socket_accept6.c        |   44 ++++++++
+ socket_bind.c           |    4 +-
+ socket_bind6.c          |   45 ++++++++
+ socket_conn.c           |    2 +-
+ socket_conn6.c          |   38 +++++++
+ socket_getifidx.c       |    8 ++
+ socket_getifname.c      |   14 +++
+ socket_ip4loopback.c    |    2 +
+ socket_local6.c         |   39 +++++++
+ socket_recv6.c          |   44 ++++++++
+ socket_remote6.c        |   39 +++++++
+ socket_send6.c          |   40 +++++++
+ socket_tcp6.c           |   44 ++++++++
+ socket_udp6.c           |   38 +++++++
+ socket_v4mappedprefix.c |    2 +
+ socket_v6any.c          |    2 +
+ socket_v6loopback.c     |    2 +
+ str.h                   |   14 ++--
+ str_chr.c               |    4 +-
+ str_diff.c              |    2 +-
+ str_len.c               |    4 +-
+ str_start.c             |    2 +-
+ stralloc.h              |   12 ++-
+ stralloc_catb.c         |    2 +-
+ stralloc_cats.c         |    2 +-
+ stralloc_opyb.c         |    2 +-
+ stralloc_opys.c         |    2 +-
+ tcp-environ.5           |   66 ++++++++++++
+ tcpcat.1                |   20 ++++
+ tcpclient.1             |  173 ++++++++++++++++++++++++++++++
+ tcpclient.c             |   73 ++++++++-----
+ tcprules.1              |  221 +++++++++++++++++++++++++++++++++++++++
+ tcprules.c              |   11 ++-
+ tcprulescheck.1         |   25 +++++
+ tcpserver.1             |  266 +++++++++++++++++++++++++++++++++++++++++++++++
+ tcpserver.c             |  112 ++++++++++++++------
+ timeoutconn.h           |    2 +
+ timeoutconn6.c          |   34 ++++++
+ tryip6.c                |    8 ++
+ who@.1                  |   32 ++++++
+ 88 files changed, 2849 insertions(+), 235 deletions(-)
+ create mode 100644 addcr.1
+ create mode 100644 argv0.1
+ create mode 100644 date@.1
+ create mode 100644 delcr.1
+ create mode 100644 dns_ip6.c
+ create mode 100644 dns_ipq6.c
+ create mode 100644 dns_nd6.c
+ create mode 100644 dns_sortip6.c
+ create mode 100644 finger@.1
+ create mode 100644 fixcr.1
+ create mode 100644 fmt_xlong.c
+ create mode 100644 haveip6.h1
+ create mode 100644 haveip6.h2
+ create mode 100644 http@.1
+ create mode 100644 ip6.h
+ create mode 100644 ip6_fmt.c
+ create mode 100644 mconnect.1
+ create mode 100644 old-rules.c
+ create mode 100644 recordio.1
+ create mode 100644 remoteinfo6.c
+ create mode 100644 scan_ip6.c
+ create mode 100644 scan_xlong.c
+ create mode 100644 socket_accept6.c
+ create mode 100644 socket_bind6.c
+ create mode 100644 socket_conn6.c
+ create mode 100644 socket_getifidx.c
+ create mode 100644 socket_getifname.c
+ create mode 100644 socket_ip4loopback.c
+ create mode 100644 socket_local6.c
+ create mode 100644 socket_recv6.c
+ create mode 100644 socket_remote6.c
+ create mode 100644 socket_send6.c
+ create mode 100644 socket_tcp6.c
+ create mode 100644 socket_udp6.c
+ create mode 100644 socket_v4mappedprefix.c
+ create mode 100644 socket_v6any.c
+ create mode 100644 socket_v6loopback.c
+ create mode 100644 tcp-environ.5
+ create mode 100644 tcpcat.1
+ create mode 100644 tcpclient.1
+ create mode 100644 tcprules.1
+ create mode 100644 tcprulescheck.1
+ create mode 100644 tcpserver.1
+ create mode 100644 timeoutconn6.c
+ create mode 100644 tryip6.c
+ create mode 100644 who@.1
+
+diff --git a/FILES b/FILES
+index cfb38a5..142aed9 100644
+--- a/FILES
++++ b/FILES
+@@ -216,3 +216,40 @@ wait_pid.c
+ warn-auto.sh
+ warn-shsgr
+ x86cpuid.c
++dns_ip6.c
++dns_ipq6.c
++dns_nd6.c
++dns_sortip6.c
++fmt_xlong.c
++ip6_fmt.c
++ip6_scan.c
++scan_0x.c
++socket_accept6.c
++socket_bind6.c
++socket_conn6.c
++socket_local6.c
++socket_recv6.c
++socket_remote6.c
++socket_send6.c
++socket_tcp6.c
++timeoutconn6.c
++tryip6.c
++haveip6.h2
++haveip6.h1
++remoteinfo6.c
++addcr.1
++argv0.1
++date@.1
++delcr.1
++finger@.1
++fixcr.1
++http@.1
++mconnect.1
++recordio.1
++tcp-environ.5
++tcpcat.1
++tcpclient.1
++tcprules.1
++tcprulescheck.1
++tcpserver.1
++who@.1
+diff --git a/Makefile b/Makefile
+index bcf5bd5..9dc6844 100644
+--- a/Makefile
++++ b/Makefile
+@@ -76,12 +76,14 @@ byte.a: \
+ makelib byte_chr.o byte_copy.o byte_cr.o byte_diff.o byte_rchr.o \
+ byte_zero.o case_diffb.o case_diffs.o fmt_ulong.o ip4_fmt.o \
+ ip4_scan.o scan_ulong.o str_chr.o str_diff.o str_len.o str_start.o \
+-uint16_pack.o uint16_unpack.o uint32_pack.o uint32_unpack.o
++uint16_pack.o uint16_unpack.o uint32_pack.o uint32_unpack.o \
++ip6_fmt.o scan_ip6.o scan_xlong.o fmt_xlong.o
+ 	./makelib byte.a byte_chr.o byte_copy.o byte_cr.o \
+ 	byte_diff.o byte_rchr.o byte_zero.o case_diffb.o \
+ 	case_diffs.o fmt_ulong.o ip4_fmt.o ip4_scan.o scan_ulong.o \
+ 	str_chr.o str_diff.o str_len.o str_start.o uint16_pack.o \
+-	uint16_unpack.o uint32_pack.o uint32_unpack.o
++	uint16_unpack.o uint32_pack.o uint32_unpack.o ip6_fmt.o \
++	scan_ip6.o scan_xlong.o fmt_xlong.o
+ 
+ byte_chr.o: \
+ compile byte_chr.c byte.h
+@@ -180,11 +182,13 @@ compile delcr.c buffer.h exit.h
+ dns.a: \
+ makelib dns_dfd.o dns_domain.o dns_dtda.o dns_ip.o dns_ipq.o \
+ dns_name.o dns_nd.o dns_packet.o dns_random.o dns_rcip.o dns_rcrw.o \
+-dns_resolve.o dns_sortip.o dns_transmit.o dns_txt.o
++dns_resolve.o dns_sortip.o dns_transmit.o dns_txt.o dns_ip6.o \
++dns_sortip6.o dns_nd6.o dns_ipq6.o
+ 	./makelib dns.a dns_dfd.o dns_domain.o dns_dtda.o dns_ip.o \
+ 	dns_ipq.o dns_name.o dns_nd.o dns_packet.o dns_random.o \
+ 	dns_rcip.o dns_rcrw.o dns_resolve.o dns_sortip.o \
+-	dns_transmit.o dns_txt.o
++	dns_transmit.o dns_txt.o dns_ip6.o dns_sortip6.o dns_nd6.o \
++	dns_ipq6.o
+ 
+ dns_dfd.o: \
+ compile dns_dfd.c error.h alloc.h byte.h dns.h stralloc.h gen_alloc.h \
+@@ -256,7 +260,7 @@ taia.h tai.h uint64.h taia.h
+ dns_transmit.o: \
+ compile dns_transmit.c socket.h uint16.h alloc.h error.h byte.h \
+ readwrite.h uint16.h dns.h stralloc.h gen_alloc.h iopause.h taia.h \
+-tai.h uint64.h taia.h
++tai.h uint64.h taia.h uint32.h
+ 	./compile dns_transmit.c
+ 
+ dns_txt.o: \
+@@ -497,9 +501,15 @@ exit.h fmt.h iopause.h taia.h tai.h uint64.h pathexec.h
+ remoteinfo.o: \
+ compile remoteinfo.c fmt.h buffer.h socket.h uint16.h error.h \
+ iopause.h taia.h tai.h uint64.h timeoutconn.h uint16.h remoteinfo.h \
+-stralloc.h gen_alloc.h uint16.h
++stralloc.h gen_alloc.h uint16.h uint32.h
+ 	./compile remoteinfo.c
+ 
++remoteinfo6.o: \
++compile remoteinfo6.c fmt.h buffer.h socket.h uint16.h error.h \
++iopause.h taia.h tai.h uint64.h timeoutconn.h uint16.h remoteinfo.h \
++stralloc.h gen_alloc.h uint16.h uint32.h
++	./compile remoteinfo6.c
++
+ rts: \
+ warn-auto.sh rts.sh conf-home
+ 	cat warn-auto.sh rts.sh \
+@@ -556,43 +566,43 @@ trylsock.c compile load
+ 	rm -f trylsock.o trylsock
+ 
+ socket_accept.o: \
+-compile socket_accept.c byte.h socket.h uint16.h
++compile socket_accept.c byte.h socket.h uint16.h uint32.h
+ 	./compile socket_accept.c
+ 
+ socket_bind.o: \
+-compile socket_bind.c byte.h socket.h uint16.h
++compile socket_bind.c byte.h socket.h uint16.h uint32.h
+ 	./compile socket_bind.c
+ 
+ socket_conn.o: \
+-compile socket_conn.c readwrite.h byte.h socket.h uint16.h
++compile socket_conn.c readwrite.h byte.h socket.h uint16.h uint32.h
+ 	./compile socket_conn.c
+ 
+ socket_delay.o: \
+-compile socket_delay.c socket.h uint16.h
++compile socket_delay.c socket.h uint16.h uint32.h
+ 	./compile socket_delay.c
+ 
+ socket_listen.o: \
+-compile socket_listen.c socket.h uint16.h
++compile socket_listen.c socket.h uint16.h uint32.h
+ 	./compile socket_listen.c
+ 
+ socket_local.o: \
+-compile socket_local.c byte.h socket.h uint16.h
++compile socket_local.c byte.h socket.h uint16.h uint32.h
+ 	./compile socket_local.c
+ 
+ socket_opts.o: \
+-compile socket_opts.c socket.h uint16.h
++compile socket_opts.c socket.h uint16.h uint32.h
+ 	./compile socket_opts.c
+ 
+ socket_remote.o: \
+-compile socket_remote.c byte.h socket.h uint16.h
++compile socket_remote.c byte.h socket.h uint16.h uint32.h
+ 	./compile socket_remote.c
+ 
+ socket_tcp.o: \
+-compile socket_tcp.c ndelay.h socket.h uint16.h
++compile socket_tcp.c ndelay.h socket.h uint16.h uint32.h
+ 	./compile socket_tcp.c
+ 
+ socket_udp.o: \
+-compile socket_udp.c ndelay.h socket.h uint16.h
++compile socket_udp.c ndelay.h socket.h uint16.h uint32.h
+ 	./compile socket_udp.c
+ 
+ str_chr.o: \
+@@ -709,9 +719,9 @@ warn-auto.sh tcpcat.sh conf-home
+ 	chmod 755 tcpcat
+ 
+ tcpclient: \
+-load tcpclient.o remoteinfo.o timeoutconn.o dns.a time.a unix.a \
+-byte.a socket.lib
+-	./load tcpclient remoteinfo.o timeoutconn.o dns.a time.a \
++load tcpclient.o remoteinfo6.o dns.a time.a unix.a \
++byte.a socket.lib byte.h timeoutconn6.o
++	./load tcpclient remoteinfo6.o timeoutconn6.o dns.a time.a \
+ 	unix.a byte.a  `cat socket.lib`
+ 
+ tcpclient.o: \
+@@ -719,7 +729,7 @@ compile tcpclient.c sig.h exit.h sgetopt.h subgetopt.h uint16.h fmt.h \
+ scan.h str.h ip4.h uint16.h socket.h uint16.h fd.h stralloc.h \
+ gen_alloc.h buffer.h error.h strerr.h pathexec.h timeoutconn.h \
+ uint16.h remoteinfo.h stralloc.h uint16.h dns.h stralloc.h iopause.h \
+-taia.h tai.h uint64.h taia.h
++taia.h tai.h uint64.h taia.h uint32.h
+ 	./compile tcpclient.c
+ 
+ tcprules: \
+@@ -741,9 +751,9 @@ stralloc.h gen_alloc.h
+ 	./compile tcprulescheck.c
+ 
+ tcpserver: \
+-load tcpserver.o rules.o remoteinfo.o timeoutconn.o cdb.a dns.a \
++load tcpserver.o rules.o remoteinfo6.o timeoutconn6.o cdb.a dns.a \
+ time.a unix.a byte.a socket.lib
+-	./load tcpserver rules.o remoteinfo.o timeoutconn.o cdb.a \
++	./load tcpserver rules.o remoteinfo6.o timeoutconn6.o cdb.a \
+ 	dns.a time.a unix.a byte.a  `cat socket.lib`
+ 
+ tcpserver.o: \
+@@ -752,7 +762,7 @@ exit.h env.h prot.h open.h wait.h readwrite.h stralloc.h gen_alloc.h \
+ alloc.h buffer.h error.h strerr.h sgetopt.h subgetopt.h pathexec.h \
+ socket.h uint16.h ndelay.h remoteinfo.h stralloc.h uint16.h rules.h \
+ stralloc.h sig.h dns.h stralloc.h iopause.h taia.h tai.h uint64.h \
+-taia.h
++taia.h uint32.h
+ 	./compile tcpserver.c
+ 
+ time.a: \
+@@ -764,9 +774,14 @@ taia_less.o taia_now.o taia_pack.o taia_sub.o taia_uint.o
+ 
+ timeoutconn.o: \
+ compile timeoutconn.c ndelay.h socket.h uint16.h iopause.h taia.h \
+-tai.h uint64.h error.h timeoutconn.h uint16.h
++tai.h uint64.h error.h timeoutconn.h uint16.h uint32.h
+ 	./compile timeoutconn.c
+ 
++timeoutconn6.o: \
++compile timeoutconn6.c ndelay.h socket.h uint16.h iopause.h taia.h \
++tai.h uint64.h error.h timeoutconn.h uint16.h uint32.h
++	./compile timeoutconn6.c
++
+ uint16_pack.o: \
+ compile uint16_pack.c uint16.h
+ 	./compile uint16_pack.c
+@@ -805,7 +820,12 @@ socket_conn.o socket_delay.o socket_listen.o socket_local.o \
+ socket_opts.o socket_remote.o socket_tcp.o socket_udp.o \
+ stralloc_cat.o stralloc_catb.o stralloc_cats.o stralloc_copy.o \
+ stralloc_eady.o stralloc_opyb.o stralloc_opys.o stralloc_pend.o \
+-strerr_die.o strerr_sys.o subgetopt.o wait_nohang.o wait_pid.o
++strerr_die.o strerr_sys.o subgetopt.o wait_nohang.o wait_pid.o \
++socket_conn6.o socket_bind6.o socket_accept6.o socket_recv6.o \
++socket_send6.o socket_local6.o socket_remote6.o socket_tcp6.o \
++socket_getifname.o socket_getifidx.o socket_v4mappedprefix.o \
++socket_ip4loopback.o socket_v6any.o socket_v6loopback.o \
++socket_udp6.o
+ 	./makelib unix.a alloc.o alloc_re.o buffer.o buffer_0.o \
+ 	buffer_1.o buffer_2.o buffer_copy.o buffer_get.o \
+ 	buffer_put.o env.o error.o error_str.o fd_copy.o fd_move.o \
+@@ -818,7 +838,12 @@ strerr_die.o strerr_sys.o subgetopt.o wait_nohang.o wait_pid.o
+ 	socket_udp.o stralloc_cat.o stralloc_catb.o stralloc_cats.o \
+ 	stralloc_copy.o stralloc_eady.o stralloc_opyb.o \
+ 	stralloc_opys.o stralloc_pend.o strerr_die.o strerr_sys.o \
+-	subgetopt.o wait_nohang.o wait_pid.o
++	subgetopt.o wait_nohang.o wait_pid.o socket_conn6.o \
++	socket_bind6.o socket_accept6.o socket_recv6.o socket_send6.o \
++	socket_local6.o socket_remote6.o socket_tcp6.o \
++	socket_getifname.o socket_getifidx.o socket_v4mappedprefix.o \
++	socket_ip4loopback.o socket_v6any.o socket_v6loopback.o \
++	socket_udp6.o
+ 
+ wait_nohang.o: \
+ compile wait_nohang.c haswaitp.h
+@@ -834,3 +859,110 @@ warn-auto.sh who@.sh conf-home
+ 	| sed s}HOME}"`head -1 conf-home`"}g \
+ 	> who@
+ 	chmod 755 who@
++
++socket_conn6.o: \
++compile socket_conn6.c socket.h uint16.h haveip6.h error.h ip6.h \
++uint32.h
++	./compile socket_conn6.c
++
++socket_bind6.o: \
++compile socket_bind6.c socket.h uint16.h haveip6.h error.h ip6.h \
++uint32.h
++	./compile socket_bind6.c
++
++socket_accept6.o: \
++compile socket_accept6.c socket.h uint16.h haveip6.h error.h ip6.h \
++uint32.h
++	./compile socket_accept6.c
++
++socket_recv6.o: \
++compile socket_recv6.c socket.h uint16.h haveip6.h error.h ip6.h \
++uint32.h
++	./compile socket_recv6.c
++
++socket_send6.o: \
++compile socket_send6.c socket.h uint16.h haveip6.h error.h uint32.h
++	./compile socket_send6.c
++
++socket_local6.o: \
++compile socket_local6.c socket.h uint16.h haveip6.h error.h uint32.h
++	./compile socket_local6.c
++
++socket_remote6.o: \
++compile socket_remote6.c socket.h uint16.h haveip6.h error.h uint32.h
++	./compile socket_remote6.c
++
++dns_sortip6.o: \
++compile dns_sortip6.c byte.h dns.h stralloc.h gen_alloc.h iopause.h \
++taia.h tai.h uint64.h taia.h
++	./compile dns_sortip6.c
++
++dns_nd6.o: \
++compile dns_nd6.c byte.h fmt.h dns.h stralloc.h gen_alloc.h iopause.h \
++taia.h tai.h uint64.h taia.h
++	./compile dns_nd6.c
++
++dns_ipq6.o: \
++compile dns_ipq6.c stralloc.h gen_alloc.h case.h byte.h str.h dns.h \
++stralloc.h iopause.h taia.h tai.h uint64.h taia.h ip6.h
++	./compile dns_ipq6.c
++
++dns_ip6.o: \
++compile dns_ip6.c stralloc.h gen_alloc.h uint16.h byte.h dns.h \
++stralloc.h iopause.h taia.h tai.h uint64.h taia.h
++	./compile dns_ip6.c
++
++fmt_xlong.o: \
++compile fmt_xlong.c scan.h
++	./compile fmt_xlong.c
++
++scan_xlong.o: \
++compile scan_xlong.c scan.h
++	./compile scan_xlong.c
++
++ip6_fmt.o: \
++compile ip6_fmt.c fmt.h ip6.h
++	./compile ip6_fmt.c
++
++scan_ip6.o: \
++compile scan_ip6.c scan.h ip6.h
++	./compile scan_ip6.c
++
++socket_tcp6.o: \
++compile socket_tcp6.c ndelay.h socket.h uint16.h haveip6.h uint32.h
++	./compile socket_tcp6.c
++
++socket_udp6.o: \
++compile socket_udp6.c ndelay.h socket.h uint16.h haveip6.h uint32.h
++	./compile socket_udp6.c
++
++haveip6.h: \
++tryip6.c choose compile haveip6.h1 haveip6.h2
++	./choose c tryip6 haveip6.h1 haveip6.h2 > haveip6.h
++
++socket_getifname.o: \
++compile socket_getifname.c socket.h uint16.h uint32.h
++	./compile socket_getifname.c
++
++socket_getifidx.o: \
++compile socket_getifidx.c socket.h uint16.h uint32.h
++	./compile socket_getifidx.c
++
++socket_ip4loopback.o: \
++compile socket_ip4loopback.c
++	./compile socket_ip4loopback.c
++
++socket_v4mappedprefix.o: \
++compile socket_v4mappedprefix.c
++	./compile socket_v4mappedprefix.c
++
++socket_v6any.o: \
++compile socket_v6any.c
++	./compile socket_v6any.c
++
++socket_v6loopback.o: \
++compile socket_v6loopback.c
++	./compile socket_v6loopback.c
++
++clean:
++	rm -f `cat TARGETS`
+diff --git a/TARGETS b/TARGETS
+index 4d1f2a0..0385f96 100644
+--- a/TARGETS
++++ b/TARGETS
+@@ -169,3 +169,31 @@ instcheck
+ it
+ setup
+ check
++dns_ip6.o
++dns_ipq6.o
++dns_nd6.o
++dns_sortip6.o
++fmt_xlong.o
++ip6_fmt.o
++ip6_scan.o
++scan_0x.o
++socket_accept6.o
++socket_bind6.o
++socket_conn6.o
++socket_local6.o
++socket_recv6.o
++socket_remote6.o
++socket_send6.o
++socket_tcp6.o
++timeoutconn6.o
++haveip6.h
++remoteinfo6.o
++socket_getifidx.o
++socket_getifname.o
++scan_ip6.o
++scan_xlong.o
++socket_ip4loopback.o
++socket_udp6.o
++socket_v4mappedprefix.o
++socket_v6any.o
++socket_v6loopback.o
+diff --git a/addcr.1 b/addcr.1
+new file mode 100644
+index 0000000..3bae1f7
+--- /dev/null
++++ b/addcr.1
+@@ -0,0 +1,22 @@
++.TH addcr 1
++.SH NAME
++addcr \- add a CR before each LF
++.SH SYNOPSIS
++.B addcr
++.SH DESCRIPTION
++.B addcr
++inserts CR at the end of each line of input.
++It does not insert CR at the end of a partial final line.
++.SH COMPATIBILITY
++Some vendors ship
++.B unix2dos
++or
++.B bsd2dos
++tools similar to
++.BR addcr .
++Those tools often blow up on long lines and nulls.
++.B addcr
++has no trouble with long lines and nulls.
++.SH "SEE ALSO"
++delcr(1),
++fixcr(1)
+diff --git a/argv0.1 b/argv0.1
+new file mode 100644
+index 0000000..ad9634d
+--- /dev/null
++++ b/argv0.1
+@@ -0,0 +1,47 @@
++.TH argv0 1
++.SH NAME
++argv0 \- run a program with a specified 0th argument
++.SH SYNOPSIS
++.B argv0
++.I realname
++.I zero
++[
++.I arg ...
++]
++.SH DESCRIPTION
++.B argv0
++runs
++the program stored as
++.I realname
++on disk,
++with the given
++arguments.
++It sets the 0th argument of
++the program to
++.IR zero .
++
++For example,
++
++.EX
++     argv0 /bin/csh -bin/csh
++.EE
++
++runs
++.B /bin/csh
++with a 0th argument of
++.BR -bin/csh .
++.B csh
++will think it is a login shell
++and behave accordingly.
++
++.B argv0
++can be used to run some
++.B inetd
++wrappers under
++.BR tcpserver .
++.SH "SEE ALSO"
++csh(1),
++tcpserver(1),
++execve(2),
++execvp(3),
++inetd(8)
+diff --git a/date@.1 b/date@.1
+new file mode 100644
+index 0000000..fa0ba98
+--- /dev/null
++++ b/date@.1
+@@ -0,0 +1,32 @@
++.TH date@ 1
++.SH NAME
++date@ \- print the date on a host
++.SH SYNTAX
++.B date@
++[
++.I host
++]
++.SH DESCRIPTION
++.B date@
++connects to TCP port 13 (Daytime) on
++.I host
++and prints any data it receives.
++It removes CR and converts unprintable characters to a visible format.
++
++If
++.I host
++is not supplied,
++.B date@
++connects to the local host.
++
++Some computers respond to port 13 with a human-readable date.
++For example, they may be running
++
++.EX
++     tcpserver 0 13 date &
++.EE
++.SH "SEE ALSO"
++cat(1),
++delcr(1),
++tcpclient(1),
++tcpserver(1)
+diff --git a/delcr.1 b/delcr.1
+new file mode 100644
+index 0000000..18ea736
+--- /dev/null
++++ b/delcr.1
+@@ -0,0 +1,30 @@
++.TH delcr 1
++.SH NAME
++delcr \- remove a CR before each LF
++.SH SYNOPSIS
++.B delcr
++.SH DESCRIPTION
++.B delcr
++removes a CR at the end of each line of input,
++if a CR is present.
++It also removes a CR at the end of a partial final line.
++
++The pipeline
++
++.EX
++     addcr | delcr
++.EE
++
++prints an exact copy of its input.
++.SH COMPATIBILITY
++Some vendors ship
++.B dos2unix
++or
++.B dos2bsd
++tools similar to
++.BR delcr .
++Those tools often blow up on long lines and nulls.
++.B delcr
++has no trouble with long lines and nulls.
++.SH "SEE ALSO"
++addcr(1)
+diff --git a/dns.h b/dns.h
+index 0948b1a..f06c5a8 100644
+--- a/dns.h
++++ b/dns.h
+@@ -34,51 +34,60 @@ struct dns_transmit {
+   unsigned int curserver;
+   struct taia deadline;
+   unsigned int pos;
+-  char *servers;
+-  char localip[4];
++  const char *servers;
++  char localip[16];
++  unsigned int scope_id;
+   char qtype[2];
+ } ;
+ 
+-extern void dns_random_init(char *);
++extern void dns_random_init(const char *);
+ extern unsigned int dns_random(unsigned int);
+ 
+ extern void dns_sortip(char *,unsigned int);
++extern void dns_sortip6(char *,unsigned int);
+ 
+ extern void dns_domain_free(char **);
+-extern int dns_domain_copy(char **,char *);
+-extern unsigned int dns_domain_length(char *);
+-extern int dns_domain_equal(char *,char *);
+-extern char *dns_domain_suffix(char *,char *);
+-extern int dns_domain_fromdot(char **,char *,unsigned int);
+-extern int dns_domain_todot_cat(stralloc *,char *);
++extern int dns_domain_copy(char **,const char *);
++extern unsigned int dns_domain_length(const char *);
++extern int dns_domain_equal(const char *,const char *);
++extern int dns_domain_suffix(const char *,const char *);
++extern unsigned int dns_domain_suffixpos(const char *,const char *);
++extern int dns_domain_fromdot(char **,const char *,unsigned int);
++extern int dns_domain_todot_cat(stralloc *,const char *);
+ 
+-extern unsigned int dns_packet_copy(char *,unsigned int,unsigned int,char *,unsigned int);
+-extern unsigned int dns_packet_getname(char *,unsigned int,unsigned int,char **);
+-extern unsigned int dns_packet_skipname(char *,unsigned int,unsigned int);
+-extern int dns_packet_nameequal(char *,unsigned int,unsigned int,char *,unsigned int,unsigned int);
++extern unsigned int dns_packet_copy(const char *,unsigned int,unsigned int,char *,unsigned int);
++extern unsigned int dns_packet_getname(const char *,unsigned int,unsigned int,char **);
++extern unsigned int dns_packet_skipname(const char *,unsigned int,unsigned int);
+ 
+-extern int dns_transmit_start(struct dns_transmit *,char *,int,char *,char *,char *);
++extern int dns_transmit_start(struct dns_transmit *,const char *,int,const char *,const char *,const char *);
+ extern void dns_transmit_free(struct dns_transmit *);
+ extern void dns_transmit_io(struct dns_transmit *,iopause_fd *,struct taia *);
+-extern int dns_transmit_get(struct dns_transmit *,iopause_fd *,struct taia *);
++extern int dns_transmit_get(struct dns_transmit *,const iopause_fd *,const struct taia *);
+ 
+ extern int dns_resolvconfip(char *);
+-extern int dns_resolve(char *,char *);
++extern int dns_resolve(const char *,const char *);
+ extern struct dns_transmit dns_resolve_tx;
+ 
+-extern int dns_ip4_packet(stralloc *,char *,unsigned int);
+-extern int dns_ip4(stralloc *,stralloc *);
+-extern int dns_name_packet(stralloc *,char *,unsigned int);
+-extern void dns_name4_domain(char *,char *);
++extern int dns_ip4_packet(stralloc *,const char *,unsigned int);
++extern int dns_ip4(stralloc *,const stralloc *);
++extern int dns_ip6_packet(stralloc *,const char *,unsigned int);
++extern int dns_ip6(stralloc *,stralloc *);
++extern int dns_name_packet(stralloc *,const char *,unsigned int);
++extern void dns_name4_domain(char *,const char *);
+ #define DNS_NAME4_DOMAIN 31
+-extern int dns_name4(stralloc *,char *);
+-extern int dns_txt_packet(stralloc *,char *,unsigned int);
+-extern int dns_txt(stralloc *,stralloc *);
+-extern int dns_mx_packet(stralloc *,char *,unsigned int);
+-extern int dns_mx(stralloc *,stralloc *);
++extern int dns_name4(stralloc *,const char *);
++extern int dns_txt_packet(stralloc *,const char *,unsigned int);
++extern int dns_txt(stralloc *,const stralloc *);
++extern int dns_mx_packet(stralloc *,const char *,unsigned int);
++extern int dns_mx(stralloc *,const stralloc *);
+ 
+ extern int dns_resolvconfrewrite(stralloc *);
+-extern int dns_ip4_qualify_rules(stralloc *,stralloc *,stralloc *,stralloc *);
+-extern int dns_ip4_qualify(stralloc *,stralloc *,stralloc *);
++extern int dns_ip4_qualify_rules(stralloc *,stralloc *,const stralloc *,const stralloc *);
++extern int dns_ip4_qualify(stralloc *,stralloc *,const stralloc *);
++extern int dns_ip6_qualify_rules(stralloc *,stralloc *,const stralloc *,const stralloc *);
++extern int dns_ip6_qualify(stralloc *,stralloc *,const stralloc *);
++
++extern int dns_name6_domain(char *,char *);
++#define DNS_NAME6_DOMAIN (4*16+11)
+ 
+ #endif
+diff --git a/dns_dfd.c b/dns_dfd.c
+index 14a29d8..c924718 100644
+--- a/dns_dfd.c
++++ b/dns_dfd.c
+@@ -1,9 +1,10 @@
+-#include "error.h"
+-#include "alloc.h"
++#include <stdlib.h>
++#include <errno.h>
+ #include "byte.h"
+ #include "dns.h"
++#include "error.h"
+ 
+-int dns_domain_fromdot(char **out,char *buf,unsigned int n)
++int dns_domain_fromdot(char **out,const char *buf,unsigned int n)
+ {
+   char label[63];
+   unsigned int labellen = 0; /* <= sizeof label */
+@@ -59,11 +60,11 @@ int dns_domain_fromdot(char **out,char *buf,unsigned int n)
+   if (namelen + 1 > sizeof name) return 0;
+   name[namelen++] = 0;
+ 
+-  x = alloc(namelen);
++  x = malloc(namelen);
+   if (!x) return 0;
+   byte_copy(x,namelen,name);
+ 
+-  if (*out) alloc_free(*out);
++  if (*out) free(*out);
+   *out = x;
+   return 1;
+ }
+diff --git a/dns_domain.c b/dns_domain.c
+index f898485..80ac5ea 100644
+--- a/dns_domain.c
++++ b/dns_domain.c
+@@ -1,16 +1,15 @@
+-#include "error.h"
+-#include "alloc.h"
++#include <stdlib.h>
+ #include "case.h"
+ #include "byte.h"
+ #include "dns.h"
+ 
+-unsigned int dns_domain_length(char *dn)
++unsigned int dns_domain_length(const char *dn)
+ {
+-  char *x;
++  const char *x;
+   unsigned char c;
+ 
+   x = dn;
+-  while (c = *x++)
++  while ((c = *x++))
+     x += (unsigned int) c;
+   return x - dn;
+ }
+@@ -18,26 +17,26 @@ unsigned int dns_domain_length(char *dn)
+ void dns_domain_free(char **out)
+ {
+   if (*out) {
+-    alloc_free(*out);
++    free(*out);
+     *out = 0;
+   }
+ }
+ 
+-int dns_domain_copy(char **out,char *in)
++int dns_domain_copy(char **out,const char *in)
+ {
+   unsigned int len;
+   char *x;
+ 
+   len = dns_domain_length(in);
+-  x = alloc(len);
++  x = malloc(len);
+   if (!x) return 0;
+   byte_copy(x,len,in);
+-  if (*out) alloc_free(*out);
++  if (*out) free(*out);
+   *out = x;
+   return 1;
+ }
+ 
+-int dns_domain_equal(char *dn1,char *dn2)
++int dns_domain_equal(const char *dn1,const char *dn2)
+ {
+   unsigned int len;
+ 
+@@ -48,12 +47,25 @@ int dns_domain_equal(char *dn1,char *dn2)
+   return 1;
+ }
+ 
+-char *dns_domain_suffix(char *big,char *little)
++int dns_domain_suffix(const char *big,const char *little)
++{
++  unsigned char c;
++
++  for (;;) {
++    if (dns_domain_equal(big,little)) return 1;
++    c = *big++;
++    if (!c) return 0;
++    big += c;
++  }
++}
++
++unsigned int dns_domain_suffixpos(const char *big,const char *little)
+ {
++  const char *orig = big;
+   unsigned char c;
+ 
+   for (;;) {
+-    if (dns_domain_equal(big,little)) return big;
++    if (dns_domain_equal(big,little)) return big - orig;
+     c = *big++;
+     if (!c) return 0;
+     big += c;
+diff --git a/dns_dtda.c b/dns_dtda.c
+index 00b41a1..ba1db4f 100644
+--- a/dns_dtda.c
++++ b/dns_dtda.c
+@@ -1,7 +1,7 @@
+ #include "stralloc.h"
+ #include "dns.h"
+ 
+-int dns_domain_todot_cat(stralloc *out,char *d)
++int dns_domain_todot_cat(stralloc *out,const char *d)
+ {
+   char ch;
+   char ch2;
+diff --git a/dns_ip.c b/dns_ip.c
+index fb0526c..e7c3a9a 100644
+--- a/dns_ip.c
++++ b/dns_ip.c
+@@ -3,7 +3,7 @@
+ #include "byte.h"
+ #include "dns.h"
+ 
+-int dns_ip4_packet(stralloc *out,char *buf,unsigned int len)
++int dns_ip4_packet(stralloc *out,const char *buf,unsigned int len)
+ {
+   unsigned int pos;
+   char header[12];
+@@ -36,7 +36,7 @@ int dns_ip4_packet(stralloc *out,char *buf,unsigned int len)
+ 
+ static char *q = 0;
+ 
+-int dns_ip4(stralloc *out,stralloc *fqdn)
++int dns_ip4(stralloc *out,const stralloc *fqdn)
+ {
+   unsigned int i;
+   char code;
+diff --git a/dns_ip6.c b/dns_ip6.c
+new file mode 100644
+index 0000000..1a2ce08
+--- /dev/null
++++ b/dns_ip6.c
+@@ -0,0 +1,103 @@
++#include "stralloc.h"
++#include "uint16.h"
++#include "byte.h"
++#include "dns.h"
++#include "ip4.h"
++#include "ip6.h"
++
++static int dns_ip6_packet_add(stralloc *out,const char *buf,unsigned int len)
++{
++  unsigned int pos;
++  char header[16];
++  uint16 numanswers;
++  uint16 datalen;
++
++  pos = dns_packet_copy(buf,len,0,header,12); if (!pos) return -1;
++  uint16_unpack_big(header + 6,&numanswers);
++  pos = dns_packet_skipname(buf,len,pos); if (!pos) return -1;
++  pos += 4;
++
++  while (numanswers--) {
++    pos = dns_packet_skipname(buf,len,pos); if (!pos) return -1;
++    pos = dns_packet_copy(buf,len,pos,header,10); if (!pos) return -1;
++    uint16_unpack_big(header + 8,&datalen);
++    if (byte_equal(header,2,DNS_T_AAAA)) {
++      if (byte_equal(header + 2,2,DNS_C_IN))
++        if (datalen == 16) {
++	  if (!dns_packet_copy(buf,len,pos,header,16)) return -1;
++	  if (!stralloc_catb(out,header,16)) return -1;
++	}
++    } else if (byte_equal(header,2,DNS_T_A))
++      if (byte_equal(header + 2,2,DNS_C_IN))
++        if (datalen == 4) {
++	  byte_copy(header,12,V4mappedprefix);
++	  if (!dns_packet_copy(buf,len,pos,header+12,4)) return -1;
++	  if (!stralloc_catb(out,header,16)) return -1;
++	}
++    pos += datalen;
++  }
++
++  dns_sortip6(out->s,out->len);
++  return 0;
++}
++
++int dns_ip6_packet(stralloc *out,const char *buf,unsigned int len) {
++  if (!stralloc_copys(out,"")) return -1;
++  return dns_ip6_packet_add(out,buf,len);
++}
++
++static char *q = 0;
++
++int dns_ip6(stralloc *out,stralloc *fqdn)
++{
++  unsigned int i;
++  char code;
++  char ch;
++  char ip[16];
++
++  if (!stralloc_copys(out,"")) return -1;
++  if (!stralloc_readyplus(fqdn,1)) return -1;
++  fqdn->s[fqdn->len]=0;
++  if ((i=scan_ip6(fqdn->s,ip))) {
++    if (fqdn->s[i]) return -1;
++    stralloc_copyb(out,ip,16);
++    return 0;
++  }
++  code = 0;
++  for (i = 0;i <= fqdn->len;++i) {
++    if (i < fqdn->len)
++      ch = fqdn->s[i];
++    else
++      ch = '.';
++
++    if ((ch == '[') || (ch == ']')) continue;
++    if (ch == '.') {
++      if (!stralloc_append(out,&code)) return -1;
++      code = 0;
++      continue;
++    }
++    if ((ch >= '0') && (ch <= '9')) {
++      code *= 10;
++      code += ch - '0';
++      continue;
++    }
++
++    if (!dns_domain_fromdot(&q,fqdn->s,fqdn->len)) return -1;
++    if (!stralloc_copys(out,"")) return -1;
++    if (dns_resolve(q,DNS_T_AAAA) != -1)
++      if (dns_ip6_packet_add(out,dns_resolve_tx.packet,dns_resolve_tx.packetlen) != -1) {
++	dns_transmit_free(&dns_resolve_tx);
++	dns_domain_free(&q);
++      }
++    if (!dns_domain_fromdot(&q,fqdn->s,fqdn->len)) return -1;
++    if (dns_resolve(q,DNS_T_A) != -1)
++      if (dns_ip6_packet_add(out,dns_resolve_tx.packet,dns_resolve_tx.packetlen) != -1) {
++	dns_transmit_free(&dns_resolve_tx);
++	dns_domain_free(&q);
++      }
++    return out->a>0?0:-1;
++  }
++
++  out->len &= ~3;
++  return 0;
++}
+diff --git a/dns_ipq.c b/dns_ipq.c
+index 8181ab7..5b65e23 100644
+--- a/dns_ipq.c
++++ b/dns_ipq.c
+@@ -4,7 +4,7 @@
+ #include "str.h"
+ #include "dns.h"
+ 
+-static int doit(stralloc *work,char *rule)
++static int doit(stralloc *work,const char *rule)
+ {
+   char ch;
+   unsigned int colon;
+@@ -30,7 +30,7 @@ static int doit(stralloc *work,char *rule)
+   return stralloc_cats(work,rule + colon + 1);
+ }
+ 
+-int dns_ip4_qualify_rules(stralloc *out,stralloc *fqdn,stralloc *in,stralloc *rules)
++int dns_ip4_qualify_rules(stralloc *out,stralloc *fqdn,const stralloc *in,const stralloc *rules)
+ {
+   unsigned int i;
+   unsigned int j;
+@@ -63,7 +63,7 @@ int dns_ip4_qualify_rules(stralloc *out,stralloc *fqdn,stralloc *in,stralloc *ru
+   }
+ }
+ 
+-int dns_ip4_qualify(stralloc *out,stralloc *fqdn,stralloc *in)
++int dns_ip4_qualify(stralloc *out,stralloc *fqdn,const stralloc *in)
+ {
+   static stralloc rules;
+   if (dns_resolvconfrewrite(&rules) == -1) return -1;
+diff --git a/dns_ipq6.c b/dns_ipq6.c
+new file mode 100644
+index 0000000..d5cea12
+--- /dev/null
++++ b/dns_ipq6.c
+@@ -0,0 +1,72 @@
++#include "stralloc.h"
++#include "case.h"
++#include "byte.h"
++#include "str.h"
++#include "dns.h"
++
++static int doit(stralloc *work,const char *rule)
++{
++  char ch;
++  unsigned int colon;
++  unsigned int prefixlen;
++
++  ch = *rule++;
++  if ((ch != '?') && (ch != '=') && (ch != '*') && (ch != '-')) return 1;
++  colon = str_chr(rule,':');
++  if (!rule[colon]) return 1;
++
++  if (work->len < colon) return 1;
++  prefixlen = work->len - colon;
++  if ((ch == '=') && prefixlen) return 1;
++  if (case_diffb(rule,colon,work->s + prefixlen)) return 1;
++  if (ch == '?') {
++    if (byte_chr(work->s,prefixlen,'.') < prefixlen) return 1;
++    if (byte_chr(work->s,prefixlen,':') < prefixlen) return 1;
++    if (byte_chr(work->s,prefixlen,'[') < prefixlen) return 1;
++    if (byte_chr(work->s,prefixlen,']') < prefixlen) return 1;
++  }
++
++  work->len = prefixlen;
++  if (ch == '-') work->len = 0;
++  return stralloc_cats(work,rule + colon + 1);
++}
++
++int dns_ip6_qualify_rules(stralloc *out,stralloc *fqdn,const stralloc *in,const stralloc *rules)
++{
++  unsigned int i;
++  unsigned int j;
++  unsigned int plus;
++  unsigned int fqdnlen;
++
++  if (!stralloc_copy(fqdn,in)) return -1;
++
++  for (j = i = 0;j < rules->len;++j)
++    if (!rules->s[j]) {
++      if (!doit(fqdn,rules->s + i)) return -1;
++      i = j + 1;
++    }
++
++  fqdnlen = fqdn->len;
++  plus = byte_chr(fqdn->s,fqdnlen,'+');
++  if (plus >= fqdnlen)
++    return dns_ip6(out,fqdn);
++
++  i = plus + 1;
++  for (;;) {
++    j = byte_chr(fqdn->s + i,fqdnlen - i,'+');
++    byte_copy(fqdn->s + plus,j,fqdn->s + i);
++    fqdn->len = plus + j;
++    if (dns_ip6(out,fqdn) == -1) return -1;
++    if (out->len) return 0;
++    i += j;
++    if (i >= fqdnlen) return 0;
++    ++i;
++  }
++}
++
++int dns_ip6_qualify(stralloc *out,stralloc *fqdn,const stralloc *in)
++{
++  static stralloc rules;
++  if (dns_resolvconfrewrite(&rules) == -1) return -1;
++  return dns_ip6_qualify_rules(out,fqdn,in,&rules);
++}
+diff --git a/dns_name.c b/dns_name.c
+index dcb10c7..1f03186 100644
+--- a/dns_name.c
++++ b/dns_name.c
+@@ -2,10 +2,11 @@
+ #include "uint16.h"
+ #include "byte.h"
+ #include "dns.h"
++#include "ip6.h"
+ 
+ static char *q = 0;
+ 
+-int dns_name_packet(stralloc *out,char *buf,unsigned int len)
++int dns_name_packet(stralloc *out,const char *buf,unsigned int len)
+ {
+   unsigned int pos;
+   char header[12];
+@@ -35,7 +36,7 @@ int dns_name_packet(stralloc *out,char *buf,unsigned int len)
+   return 0;
+ }
+ 
+-int dns_name4(stralloc *out,char ip[4])
++int dns_name4(stralloc *out,const char ip[4])
+ {
+   char name[DNS_NAME4_DOMAIN];
+ 
+@@ -46,3 +47,17 @@ int dns_name4(stralloc *out,char ip[4])
+   dns_domain_free(&q);
+   return 0;
+ }
++
++int dns_name6(stralloc *out,char ip[16])
++{
++  char name[DNS_NAME6_DOMAIN];
++
++  if (ip6_isv4mapped(ip))
++    return dns_name4(out,ip+12);
++  dns_name6_domain(name,ip);
++  if (dns_resolve(name,DNS_T_PTR) == -1) return -1;
++  if (dns_name_packet(out,dns_resolve_tx.packet,dns_resolve_tx.packetlen) == -1) return -1;
++  dns_transmit_free(&dns_resolve_tx);
++  dns_domain_free(&q);
++  return 0;
++}
+diff --git a/dns_nd.c b/dns_nd.c
+index 279d74d..aa54e5d 100644
+--- a/dns_nd.c
++++ b/dns_nd.c
+@@ -2,7 +2,7 @@
+ #include "fmt.h"
+ #include "dns.h"
+ 
+-void dns_name4_domain(char name[DNS_NAME4_DOMAIN],char ip[4])
++void dns_name4_domain(char name[DNS_NAME4_DOMAIN],const char ip[4])
+ {
+   unsigned int namelen;
+   unsigned int i;
+diff --git a/dns_nd6.c b/dns_nd6.c
+new file mode 100644
+index 0000000..fb1da88
+--- /dev/null
++++ b/dns_nd6.c
+@@ -0,0 +1,28 @@
++#include "byte.h"
++#include "fmt.h"
++#include "dns.h"
++
++/* RFC1886:
++ *   4321:0:1:2:3:4:567:89ab
++ * ->
++ *   b.a.9.8.7.6.5.0.4.0.0.0.3.0.0.0.2.0.0.0.1.0.0.0.0.0.0.0.1.2.3.4.IP6.INT.
++ */
++
++static inline char tohex(char c) {
++  return c>=10?c-10+'a':c+'0';
++}
++
++int dns_name6_domain(char name[DNS_NAME6_DOMAIN],char ip[16])
++{
++  unsigned int j;
++
++  for (j=0; j<16; j++) {
++    name[j*4]=1;
++    name[j*4+1]=tohex(ip[15-j] & 15);
++    name[j*4+2]=1;
++    name[j*4+3]=tohex((unsigned char)ip[15-j] >> 4);
++  }
++  byte_copy(name + 4*16,10,"\3ip6\4arpa\0");
++  return 4*16+10;
++}
++
+diff --git a/dns_packet.c b/dns_packet.c
+index 04a2cc8..72cfb35 100644
+--- a/dns_packet.c
++++ b/dns_packet.c
+@@ -2,10 +2,11 @@
+ DNS should have used LZ77 instead of its own sophomoric compression algorithm.
+ */
+ 
+-#include "error.h"
++#include <errno.h>
+ #include "dns.h"
++#include "error.h"
+ 
+-unsigned int dns_packet_copy(char *buf,unsigned int len,unsigned int pos,char *out,unsigned int outlen)
++unsigned int dns_packet_copy(const char *buf,unsigned int len,unsigned int pos,char *out,unsigned int outlen)
+ {
+   while (outlen) {
+     if (pos >= len) { errno = error_proto; return 0; }
+@@ -15,7 +16,7 @@ unsigned int dns_packet_copy(char *buf,unsigned int len,unsigned int pos,char *o
+   return pos;
+ }
+ 
+-unsigned int dns_packet_skipname(char *buf,unsigned int len,unsigned int pos)
++unsigned int dns_packet_skipname(const char *buf,unsigned int len,unsigned int pos)
+ {
+   unsigned char ch;
+ 
+@@ -32,7 +33,7 @@ unsigned int dns_packet_skipname(char *buf,unsigned int len,unsigned int pos)
+   return 0;
+ }
+ 
+-unsigned int dns_packet_getname(char *buf,unsigned int len,unsigned int pos,char **d)
++unsigned int dns_packet_getname(const char *buf,unsigned int len,unsigned int pos,char **d)
+ {
+   unsigned int loop = 0;
+   unsigned int state = 0;
+diff --git a/dns_random.c b/dns_random.c
+index b9892b4..2158ed4 100644
+--- a/dns_random.c
++++ b/dns_random.c
+@@ -1,3 +1,4 @@
++#include <unistd.h>
+ #include "dns.h"
+ #include "taia.h"
+ #include "uint32.h"
+@@ -29,7 +30,7 @@ static void surf(void)
+   }
+ }
+ 
+-void dns_random_init(char data[128])
++void dns_random_init(const char data[128])
+ {
+   int i;
+   struct taia t;
+diff --git a/dns_rcip.c b/dns_rcip.c
+index 2356c8b..794f6be 100644
+--- a/dns_rcip.c
++++ b/dns_rcip.c
+@@ -2,12 +2,13 @@
+ #include "openreadclose.h"
+ #include "byte.h"
+ #include "ip4.h"
+-#include "env.h"
++#include "ip6.h"
+ #include "dns.h"
++#include "env.h"
+ 
+ static stralloc data = {0};
+ 
+-static int init(char ip[64])
++static int init(char ip[256])
+ {
+   int i;
+   int j;
+@@ -16,15 +17,16 @@ static int init(char ip[64])
+ 
+   x = env_get("DNSCACHEIP");
+   if (x)
+-    while (iplen <= 60)
++    while (iplen <= 60) {
+       if (*x == '.')
+ 	++x;
+       else {
+-        i = ip4_scan(x,ip + iplen);
++        i = scan_ip6(x,ip + iplen);
+ 	if (!i) break;
+ 	x += i;
+-	iplen += 4;
++	iplen += 16;
+       }
++    }
+ 
+   if (!iplen) {
+     i = openreadclose("/etc/resolv.conf",&data,64);
+@@ -39,8 +41,9 @@ static int init(char ip[64])
+             while ((data.s[i] == ' ') || (data.s[i] == '\t'))
+               ++i;
+             if (iplen <= 60)
+-              if (ip4_scan(data.s + i,ip + iplen))
+-                iplen += 4;
++              if (scan_ip6(data.s + i,ip + iplen)) {
++                iplen += 16;
++	      }
+           }
+           i = j + 1;
+         }
+@@ -48,19 +51,19 @@ static int init(char ip[64])
+   }
+ 
+   if (!iplen) {
+-    byte_copy(ip,4,"\177\0\0\1");
+-    iplen = 4;
++    byte_copy(ip,16,"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1");
++    iplen = 16;
+   }
+-  byte_zero(ip + iplen,64 - iplen);
++  byte_zero(ip + iplen,256 - iplen);
+   return 0;
+ }
+ 
+ static int ok = 0;
+ static unsigned int uses;
+ static struct taia deadline;
+-static char ip[64]; /* defined if ok */
++static char ip[256]; /* defined if ok */
+ 
+-int dns_resolvconfip(char s[64])
++int dns_resolvconfip(char s[256])
+ {
+   struct taia now;
+ 
+@@ -77,6 +80,6 @@ int dns_resolvconfip(char s[64])
+   }
+ 
+   --uses;
+-  byte_copy(s,64,ip);
++  byte_copy(s,256,ip);
+   return 0;
+ }
+diff --git a/dns_rcrw.c b/dns_rcrw.c
+index 6f215ac..b0c8e6d 100644
+--- a/dns_rcrw.c
++++ b/dns_rcrw.c
+@@ -1,16 +1,17 @@
++#include <unistd.h>
+ #include "taia.h"
+-#include "env.h"
+ #include "byte.h"
+ #include "str.h"
+ #include "openreadclose.h"
+ #include "dns.h"
++#include "env.h"
+ 
+ static stralloc data = {0};
+ 
+ static int init(stralloc *rules)
+ {
+   char host[256];
+-  char *x;
++  const char *x;
+   int i;
+   int j;
+   int k;
+diff --git a/dns_resolve.c b/dns_resolve.c
+index 3365c00..82b5bbb 100644
+--- a/dns_resolve.c
++++ b/dns_resolve.c
+@@ -2,19 +2,20 @@
+ #include "taia.h"
+ #include "byte.h"
+ #include "dns.h"
++#include "ip6.h"
+ 
+ struct dns_transmit dns_resolve_tx = {0};
+ 
+-int dns_resolve(char *q,char qtype[2])
++int dns_resolve(const char *q,const char qtype[2])
+ {
+   struct taia stamp;
+   struct taia deadline;
+-  char servers[64];
++  char servers[256];
+   iopause_fd x[1];
+   int r;
+ 
+   if (dns_resolvconfip(servers) == -1) return -1;
+-  if (dns_transmit_start(&dns_resolve_tx,servers,1,q,qtype,"\0\0\0\0") == -1) return -1;
++  if (dns_transmit_start(&dns_resolve_tx,servers,1,q,qtype,V6any) == -1) return -1;
+ 
+   for (;;) {
+     taia_now(&stamp);
+diff --git a/dns_sortip6.c b/dns_sortip6.c
+new file mode 100644
+index 0000000..7e752e9
+--- /dev/null
++++ b/dns_sortip6.c
+@@ -0,0 +1,20 @@
++#include "byte.h"
++#include "dns.h"
++
++/* XXX: sort servers by configurable notion of closeness? */
++/* XXX: pay attention to competence of each server? */
++
++void dns_sortip6(char *s,unsigned int n)
++{
++  unsigned int i;
++  char tmp[16];
++
++  n >>= 4;
++  while (n > 1) {
++    i = dns_random(n);
++    --n;
++    byte_copy(tmp,16,s + (i << 4));
++    byte_copy(s + (i << 4),16,s + (n << 4));
++    byte_copy(s + (n << 4),16,tmp);
++  }
++}
+diff --git a/dns_transmit.c b/dns_transmit.c
+index df12826..9511511 100644
+--- a/dns_transmit.c
++++ b/dns_transmit.c
+@@ -1,12 +1,15 @@
++#include <sys/types.h>
++#include <sys/socket.h>
++#include <unistd.h>
++#include <stdlib.h>
+ #include "socket.h"
+-#include "alloc.h"
+-#include "error.h"
++#include <errno.h>
+ #include "byte.h"
+-#include "readwrite.h"
+ #include "uint16.h"
+ #include "dns.h"
++#include "ip6.h"
+ 
+-static int serverwantstcp(char *buf,unsigned int len)
++static int serverwantstcp(const char *buf,unsigned int len)
+ {
+   char out[12];
+ 
+@@ -15,7 +18,7 @@ static int serverwantstcp(char *buf,unsigned int len)
+   return 0;
+ }
+ 
+-static int serverfailed(char *buf,unsigned int len)
++static int serverfailed(const char *buf,unsigned int len)
+ {
+   char out[12];
+   unsigned int rcode;
+@@ -23,11 +26,11 @@ static int serverfailed(char *buf,unsigned int len)
+   if (!dns_packet_copy(buf,len,0,out,12)) return 1;
+   rcode = out[3];
+   rcode &= 15;
+-  if (rcode && (rcode != 3)) { errno = error_again; return 1; }
++  if (rcode && (rcode != 3)) { errno = EAGAIN; return 1; }
+   return 0;
+ }
+ 
+-static int irrelevant(struct dns_transmit *d,char *buf,unsigned int len)
++static int irrelevant(const struct dns_transmit *d,const char *buf,unsigned int len)
+ {
+   char out[12];
+   char *dn;
+@@ -40,8 +43,8 @@ static int irrelevant(struct dns_transmit *d,char *buf,unsigned int len)
+ 
+   dn = 0;
+   pos = dns_packet_getname(buf,len,pos,&dn); if (!pos) return 1;
+-  if (!dns_domain_equal(dn,d->query + 14)) { alloc_free(dn); return 1; }
+-  alloc_free(dn);
++  if (!dns_domain_equal(dn,d->query + 14)) { free(dn); return 1; }
++  free(dn);
+ 
+   pos = dns_packet_copy(buf,len,pos,out,4); if (!pos) return 1;
+   if (byte_diff(out,2,d->qtype)) return 1;
+@@ -53,14 +56,14 @@ static int irrelevant(struct dns_transmit *d,char *buf,unsigned int len)
+ static void packetfree(struct dns_transmit *d)
+ {
+   if (!d->packet) return;
+-  alloc_free(d->packet);
++  free(d->packet);
+   d->packet = 0;
+ }
+ 
+ static void queryfree(struct dns_transmit *d)
+ {
+   if (!d->query) return;
+-  alloc_free(d->query);
++  free(d->query);
+   d->query = 0;
+ }
+ 
+@@ -83,9 +86,9 @@ static int randombind(struct dns_transmit *d)
+   int j;
+ 
+   for (j = 0;j < 10;++j)
+-    if (socket_bind4(d->s1 - 1,d->localip,1025 + dns_random(64510)) == 0)
++    if (socket_bind6(d->s1 - 1,d->localip,1025 + dns_random(64510),d->scope_id) == 0)
+       return 0;
+-  if (socket_bind4(d->s1 - 1,d->localip,0) == 0)
++  if (socket_bind6(d->s1 - 1,d->localip,0,d->scope_id) == 0)
+     return 0;
+   return -1;
+ }
+@@ -94,22 +97,22 @@ static const int timeouts[4] = { 1, 3, 11, 45 };
+ 
+ static int thisudp(struct dns_transmit *d)
+ {
+-  char *ip;
++  const char *ip;
+ 
+   socketfree(d);
+ 
+   while (d->udploop < 4) {
+     for (;d->curserver < 16;++d->curserver) {
+-      ip = d->servers + 4 * d->curserver;
+-      if (byte_diff(ip,4,"\0\0\0\0")) {
++      ip = d->servers + 16 * d->curserver;
++      if (byte_diff(ip,16,V6any)) {
+ 	d->query[2] = dns_random(256);
+ 	d->query[3] = dns_random(256);
+   
+-        d->s1 = 1 + socket_udp();
++        d->s1 = 1 + socket_udp6();
+         if (!d->s1) { dns_transmit_free(d); return -1; }
+ 	if (randombind(d) == -1) { dns_transmit_free(d); return -1; }
+ 
+-        if (socket_connect4(d->s1 - 1,ip,53) == 0)
++        if (socket_connect6(d->s1 - 1,ip,53,d->scope_id) == 0)
+           if (send(d->s1 - 1,d->query + 2,d->querylen - 2,0) == d->querylen - 2) {
+             struct taia now;
+             taia_now(&now);
+@@ -145,29 +148,29 @@ static int nextudp(struct dns_transmit *d)
+ static int thistcp(struct dns_transmit *d)
+ {
+   struct taia now;
+-  char *ip;
++  const char *ip;
+ 
+   socketfree(d);
+   packetfree(d);
+ 
+   for (;d->curserver < 16;++d->curserver) {
+-    ip = d->servers + 4 * d->curserver;
+-    if (byte_diff(ip,4,"\0\0\0\0")) {
++    ip = d->servers + 16 * d->curserver;
++    if (byte_diff(ip,16,V6any)) {
+       d->query[2] = dns_random(256);
+       d->query[3] = dns_random(256);
+ 
+-      d->s1 = 1 + socket_tcp();
++      d->s1 = 1 + socket_tcp6();
+       if (!d->s1) { dns_transmit_free(d); return -1; }
+       if (randombind(d) == -1) { dns_transmit_free(d); return -1; }
+   
+       taia_now(&now);
+       taia_uint(&d->deadline,10);
+       taia_add(&d->deadline,&d->deadline,&now);
+-      if (socket_connect4(d->s1 - 1,ip,53) == 0) {
++      if (socket_connect6(d->s1 - 1,ip,53,d->scope_id) == 0) {
+         d->tcpstate = 2;
+         return 0;
+       }
+-      if ((errno == error_inprogress) || (errno == error_wouldblock)) {
++      if ((errno == EINPROGRESS) || (errno == EWOULDBLOCK)) {
+         d->tcpstate = 1;
+         return 0;
+       }
+@@ -191,16 +194,16 @@ static int nexttcp(struct dns_transmit *d)
+   return thistcp(d);
+ }
+ 
+-int dns_transmit_start(struct dns_transmit *d,char servers[64],int flagrecursive,char *q,char qtype[2],char localip[4])
++int dns_transmit_start(struct dns_transmit *d,const char servers[256],int flagrecursive,const char *q,const char qtype[2],const char localip[16])
+ {
+   unsigned int len;
+ 
+   dns_transmit_free(d);
+-  errno = error_io;
++  errno = EIO;
+ 
+   len = dns_domain_length(q);
+   d->querylen = len + 18;
+-  d->query = alloc(d->querylen);
++  d->query = malloc(d->querylen);
+   if (!d->query) return -1;
+ 
+   uint16_pack_big(d->query,len + 16);
+@@ -211,7 +214,7 @@ int dns_transmit_start(struct dns_transmit *d,char servers[64],int flagrecursive
+ 
+   byte_copy(d->qtype,2,qtype);
+   d->servers = servers;
+-  byte_copy(d->localip,4,localip);
++  byte_copy(d->localip,16,localip);
+ 
+   d->udploop = flagrecursive ? 1 : 0;
+ 
+@@ -236,19 +239,19 @@ void dns_transmit_io(struct dns_transmit *d,iopause_fd *x,struct taia *deadline)
+     *deadline = d->deadline;
+ }
+ 
+-int dns_transmit_get(struct dns_transmit *d,iopause_fd *x,struct taia *when)
++int dns_transmit_get(struct dns_transmit *d,const iopause_fd *x,const struct taia *when)
+ {
+   char udpbuf[513];
+   unsigned char ch;
+   int r;
+   int fd;
+ 
+-  errno = error_io;
++  errno = EIO;
+   fd = d->s1 - 1;
+ 
+   if (!x->revents) {
+     if (taia_less(when,&d->deadline)) return 0;
+-    errno = error_timeout;
++    errno = ETIMEDOUT;
+     if (d->tcpstate == 0) return nextudp(d);
+     return nexttcp(d);
+   }
+@@ -260,7 +263,7 @@ have sent query to curserver on UDP socket s
+ */
+     r = recv(fd,udpbuf,sizeof udpbuf,0);
+     if (r <= 0) {
+-      if (d->udploop == 2) return 0;
++      if (errno == ECONNREFUSED) if (d->udploop == 2) return 0;
+       return nextudp(d);
+     }
+     if (r + 1 > sizeof udpbuf) return 0;
+@@ -274,7 +277,7 @@ have sent query to curserver on UDP socket s
+     socketfree(d);
+ 
+     d->packetlen = r;
+-    d->packet = alloc(d->packetlen);
++    d->packet = malloc(d->packetlen);
+     if (!d->packet) { dns_transmit_free(d); return -1; }
+     byte_copy(d->packet,d->packetlen,udpbuf);
+     queryfree(d);
+@@ -334,7 +337,7 @@ have received one byte of packet length into packetlen
+     d->packetlen += ch;
+     d->tcpstate = 5;
+     d->pos = 0;
+-    d->packet = alloc(d->packetlen);
++    d->packet = malloc(d->packetlen);
+     if (!d->packet) { dns_transmit_free(d); return -1; }
+     return 0;
+   }
+diff --git a/dns_txt.c b/dns_txt.c
+index 263b641..44deafe 100644
+--- a/dns_txt.c
++++ b/dns_txt.c
+@@ -3,7 +3,7 @@
+ #include "byte.h"
+ #include "dns.h"
+ 
+-int dns_txt_packet(stralloc *out,char *buf,unsigned int len)
++int dns_txt_packet(stralloc *out,const char *buf,unsigned int len)
+ {
+   unsigned int pos;
+   char header[12];
+@@ -48,7 +48,7 @@ int dns_txt_packet(stralloc *out,char *buf,unsigned int len)
+ 
+ static char *q = 0;
+ 
+-int dns_txt(stralloc *out,stralloc *fqdn)
++int dns_txt(stralloc *out,const stralloc *fqdn)
+ {
+   if (!dns_domain_fromdot(&q,fqdn->s,fqdn->len)) return -1;
+   if (dns_resolve(q,DNS_T_TXT) == -1) return -1;
+diff --git a/error.h b/error.h
+index d5f3c7e..f660d93 100644
+--- a/error.h
++++ b/error.h
+@@ -1,7 +1,7 @@
+ #ifndef ERROR_H
+ #define ERROR_H
+ 
+-extern int errno;
++#include <errno.h>
+ 
+ extern int error_intr;
+ extern int error_nomem;
+diff --git a/finger@.1 b/finger@.1
+new file mode 100644
+index 0000000..93b6288
+--- /dev/null
++++ b/finger@.1
+@@ -0,0 +1,45 @@
++.TH finger@ 1
++.SH NAME
++finger@ \- get user information from a host
++.SH SYNTAX
++.B finger@
++[
++.I host
++[
++.I user
++]
++]
++.SH DESCRIPTION
++.B finger@
++connects to TCP port 79 (Finger) on
++.IR host ,
++sends
++.I user
++(with an extra CR)
++to
++.IR host ,
++and prints any data it receives.
++It removes CR and converts unprintable characters to a visible format.
++Some computers respond to port 79 with information about
++.IR user .
++
++If
++.I user
++is not supplied,
++.B finger@
++sends a blank line to
++.IR host .
++Some computers respond with information about
++all the users who are logged in.
++
++If
++.I host
++is not supplied,
++.B finger@
++connects to the local host.
++.SH "SEE ALSO"
++addcr(1),
++cat(1),
++delcr(1),
++finger(1),
++tcpclient(1)
+diff --git a/fixcr.1 b/fixcr.1
+new file mode 100644
+index 0000000..ebb8b53
+--- /dev/null
++++ b/fixcr.1
+@@ -0,0 +1,11 @@
++.TH fixcr 1
++.SH NAME
++fixcr \- make sure that there is a CR before each LF
++.SH SYNOPSIS
++.B fixcr
++.SH DESCRIPTION
++.B fixcr
++inserts CR at the end of each line of input where a CR is not already present.
++It does not insert CR at the end of a partial final line.
++.SH "SEE ALSO"
++addcr(1)
+diff --git a/fmt_xlong.c b/fmt_xlong.c
+new file mode 100644
+index 0000000..332fc9a
+--- /dev/null
++++ b/fmt_xlong.c
+@@ -0,0 +1,22 @@
++#include "fmt.h"
++
++char tohex(char num) {
++  if (num<10)
++    return num+'0';
++  else if (num<16)
++    return num-10+'a';
++  else
++    return -1;
++}
++
++unsigned int fmt_xlong(register char *s,register unsigned long u)
++{
++  register unsigned int len; register unsigned long q;
++  len = 1; q = u;
++  while (q > 15) { ++len; q /= 16; }
++  if (s) {
++    s += len;
++    do { *--s = tohex(u % 16); u /= 16; } while(u); /* handles u == 0 */
++  }
++  return len;
++}
+diff --git a/haveip6.h1 b/haveip6.h1
+new file mode 100644
+index 0000000..8b13789
+--- /dev/null
++++ b/haveip6.h1
+@@ -0,0 +1 @@
++
+diff --git a/haveip6.h2 b/haveip6.h2
+new file mode 100644
+index 0000000..5564de9
+--- /dev/null
++++ b/haveip6.h2
+@@ -0,0 +1 @@
++#define LIBC_HAS_IP6 1
+diff --git a/hier.c b/hier.c
+index 5663ada..546cc6d 100644
+--- a/hier.c
++++ b/hier.c
+@@ -4,6 +4,9 @@ void hier()
+ {
+   h(auto_home,-1,-1,02755);
+   d(auto_home,"bin",-1,-1,02755);
++  d(auto_home,"man",-1,-1,02755);
++  d(auto_home,"man/man1",-1,-1,02755);
++  d(auto_home,"man/man5",-1,-1,02755);
+ 
+   c(auto_home,"bin","tcpserver",-1,-1,0755);
+   c(auto_home,"bin","tcprules",-1,-1,0755);
+@@ -22,4 +25,20 @@ void hier()
+   c(auto_home,"bin","delcr",-1,-1,0755);
+   c(auto_home,"bin","fixcrio",-1,-1,0755);
+   c(auto_home,"bin","rblsmtpd",-1,-1,0755);
++
++  c(auto_home,"man/man1","tcpclient.1",-1,-1,0644);
++  c(auto_home,"man/man1","tcpserver.1",-1,-1,0644);
++  c(auto_home,"man/man1","tcprules.1",-1,-1,0644);
++  c(auto_home,"man/man1","tcprulescheck.1",-1,-1,0644);
++  c(auto_home,"man/man1","fixcr.1",-1,-1,0644);
++  c(auto_home,"man/man1","addcr.1",-1,-1,0644);
++  c(auto_home,"man/man1","delcr.1",-1,-1,0644);
++  c(auto_home,"man/man1","who@.1",-1,-1,0644);
++  c(auto_home,"man/man1","date@.1",-1,-1,0644);
++  c(auto_home,"man/man1","finger@.1",-1,-1,0644);
++  c(auto_home,"man/man1","http@.1",-1,-1,0644);
++  c(auto_home,"man/man1","mconnect.1",-1,-1,0644);
++  c(auto_home,"man/man1","argv0.1",-1,-1,0644);
++  c(auto_home,"man/man1","recordio.1",-1,-1,0644);
++  c(auto_home,"man/man5","tcp-environ.5",-1,-1,0644);
+ }
+diff --git a/http@.1 b/http@.1
+new file mode 100644
+index 0000000..4861b34
+--- /dev/null
++++ b/http@.1
+@@ -0,0 +1,52 @@
++.TH http@ 1
++.SH NAME
++http@ \- get a web page from a host through HTTP
++.SH SYNTAX
++.B http@
++[
++.I host
++[
++.I page
++[
++.I port
++]
++]
++]
++.SH DESCRIPTION
++.B http@
++connects to
++.I port
++on
++.IR host ,
++sends
++.B GET /\fIpage
++(with an extra CR)
++to
++.IR host ,
++and prints any data it receives,
++removing CR from the end of each line.
++
++If
++.I port
++is not supplied,
++.B http@
++uses port 80 (HTTP).
++
++If
++.I page
++is not supplied,
++.B http@
++sends
++.B GET /
++to
++.IR host .
++
++If
++.I host
++is not supplied,
++.B http@
++connects to the local host.
++.SH "SEE ALSO"
++addcr(1),
++delcr(1),
++tcpclient(1)
+diff --git a/ip4.h b/ip4.h
+index 64a7c1e..b906557 100644
+--- a/ip4.h
++++ b/ip4.h
+@@ -6,4 +6,6 @@ extern unsigned int ip4_fmt(char *,char *);
+ 
+ #define IP4_FMT 20
+ 
++extern const char ip4loopback[4]; /* = {127,0,0,1}; */
++
+ #endif
+diff --git a/ip6.h b/ip6.h
+new file mode 100644
+index 0000000..88ff120
+--- /dev/null
++++ b/ip6.h
+@@ -0,0 +1,28 @@
++#ifndef IP6_H
++#define IP6_H
++
++#include "byte.h"
++
++extern unsigned int scan_ip6(const char *src,char *ip);
++extern unsigned int fmt_ip6(char *dest,const char *ip);
++
++extern unsigned int scan_ip6_flat(const char *src,char *);
++extern unsigned int fmt_ip6_flat(char *dest,const char *);
++
++/*
++ ip6 address syntax: (h = hex digit), no leading '0' required
++   1. hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh
++   2. any number of 0000 may be abbreviated as "::", but only once
++ flat ip6 address syntax:
++   hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
++ */
++
++#define IP6_FMT 40
++
++extern const unsigned char V4mappedprefix[12]; /*={0,0,0,0,0,0,0,0,0,0,0xff,0xff}; */
++extern const unsigned char V6loopback[16]; /*={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1}; */
++extern const unsigned char V6any[16]; /*={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; */
++
++#define ip6_isv4mapped(ip) (byte_equal(ip,12,V4mappedprefix))
++
++#endif
+diff --git a/ip6_fmt.c b/ip6_fmt.c
+new file mode 100644
+index 0000000..d7c010a
+--- /dev/null
++++ b/ip6_fmt.c
+@@ -0,0 +1,64 @@
++#include "fmt.h"
++#include "byte.h"
++#include "ip4.h"
++#include "ip6.h"
++
++unsigned int ip6_fmt(char *s,char ip[16])
++{
++  unsigned long len,temp, k, pos0=0,len0=0, pos1=0, compr=0;
++
++  for (k=0; k<16; k+=2) {
++    if (ip[k]==0 && ip[k+1]==0) {
++      if (!compr) {
++        compr=1;
++        pos1=k;
++      }
++      if (k==14) { k=16; goto last; }
++    } else if (compr) {
++    last:
++      if ((temp=k-pos1) > len0) {
++        len0=temp;
++        pos0=pos1;
++      }
++      compr=0;
++    }
++  }
++
++  for (len=0,k=0; k<16; k+=2) {
++    if (k==12 && ip6_isv4mapped(ip)) {
++      len += ip4_fmt(s,ip+12);
++      break;
++    }
++    if (pos0==k && len0) {
++      if (k==0) { ++len; if (s) *s++ = ':'; }
++      ++len; if (s) *s++ = ':';
++      k += len0-2;
++      continue;
++    }
++    temp = ((unsigned long) (unsigned char) ip[k] << 8) +
++            (unsigned long) (unsigned char) ip[k+1];
++    temp = fmt_xlong(s,temp); len += temp; if (s) s += temp;
++    if (k<14) { ++len; if (s) *s++ = ':'; }
++  }
++
++  return len;
++}
++
++static char tohex(char num) {
++  if (num<10)
++    return num+'0';
++  else if (num<16)
++    return num-10+'a';
++  else
++    return -1;
++}
++
++unsigned int ip6_fmt_flat(char *s,char ip[16])
++{
++  int i;
++  for (i=0; i<16; i++) {
++    *s++=tohex((unsigned char)ip[i] >> 4);
++    *s++=tohex((unsigned char)ip[i] & 15);
++  }
++  return 32;
++}
+diff --git a/mconnect.1 b/mconnect.1
+new file mode 100644
+index 0000000..6648367
+--- /dev/null
++++ b/mconnect.1
+@@ -0,0 +1,36 @@
++.TH mconnect 1
++.SH NAME
++mconnect \- connect to the SMTP server on a host
++.SH SYNTAX
++.B mconnect
++[
++.I host
++[
++.I port
++]
++]
++.SH DESCRIPTION
++.B mconnect
++connects to
++.I port
++on
++.IR host .
++It sends its input to
++.IR host ,
++adding a CR to each line.
++Meanwhile it prints anything it receives from
++.IR host .
++
++If
++.I port
++is not supplied,
++.B mconnect
++uses port 25 (SMTP).
++
++If
++.I host
++is not supplied,
++.B mconnect
++connects to the local host.
++.SH "SEE ALSO"
++tcpclient(1)
+diff --git a/old-rules.c b/old-rules.c
+new file mode 100644
+index 0000000..7225115
+--- /dev/null
++++ b/old-rules.c
+@@ -0,0 +1,101 @@
++#include "alloc.h"
++#include "stralloc.h"
++#include "open.h"
++#include "cdb.h"
++#include "rules.h"
++
++stralloc rules_name = {0};
++
++static struct cdb c;
++
++static int dorule(void (*callback)(char *,unsigned int))
++{
++  char *data;
++  unsigned int datalen;
++
++  switch(cdb_find(&c,rules_name.s,rules_name.len)) {
++    case -1: return -1;
++    case 0: return 0;
++  }
++
++  datalen = cdb_datalen(&c);
++  data = alloc(datalen);
++  if (!data) return -1;
++  if (cdb_read(&c,data,datalen,cdb_datapos(&c)) == -1) {
++    alloc_free(data);
++    return -1;
++  }
++
++  callback(data,datalen);
++  alloc_free(data);
++  return 1;
++}
++
++static int doit(void (*callback)(char *,unsigned int),char *ip,char *host,char *info)
++{
++  int r;
++
++  if (info) {
++    if (!stralloc_copys(&rules_name,info)) return -1;
++    if (!stralloc_cats(&rules_name,"@")) return -1;
++    if (!stralloc_cats(&rules_name,ip)) return -1;
++    r = dorule(callback);
++    if (r) return r;
++
++    if (host) {
++      if (!stralloc_copys(&rules_name,info)) return -1;
++      if (!stralloc_cats(&rules_name,"@=")) return -1;
++      if (!stralloc_cats(&rules_name,host)) return -1;
++      r = dorule(callback);
++      if (r) return r;
++    }
++  }
++
++  if (!stralloc_copys(&rules_name,ip)) return -1;
++  r = dorule(callback);
++  if (r) return r;
++
++  if (host) {
++    if (!stralloc_copys(&rules_name,"=")) return -1;
++    if (!stralloc_cats(&rules_name,host)) return -1;
++    r = dorule(callback);
++    if (r) return r;
++  }
++
++  if (!stralloc_copys(&rules_name,ip)) return -1;
++  while (rules_name.len > 0) {
++    if (ip[rules_name.len - 1] == '.' ||
++	(ip[rules_name.len-1]==':' && rules_name.len>1)) {
++      r = dorule(callback);
++      if (r) return r;
++    }
++    --rules_name.len;
++  }
++
++  if (host) {
++    while (*host) {
++      if (*host == '.') {
++        if (!stralloc_copys(&rules_name,"=")) return -1;
++        if (!stralloc_cats(&rules_name,host)) return -1;
++	r = dorule(callback);
++	if (r) return r;
++      }
++      ++host;
++    }
++    if (!stralloc_copys(&rules_name,"=")) return -1;
++    r = dorule(callback);
++    if (r) return r;
++  }
++
++  rules_name.len = 0;
++  return dorule(callback);
++}
++
++int rules(void (*callback)(char *,unsigned int),int fd,char *ip,char *host,char *info)
++{
++  int r;
++  cdb_init(&c,fd);
++  r = doit(callback,ip,host,info);
++  cdb_free(&c);
++  return r;
++}
+diff --git a/pathexec.h b/pathexec.h
+index 6fcbb89..bef93b4 100644
+--- a/pathexec.h
++++ b/pathexec.h
+@@ -2,7 +2,7 @@
+ #define PATHEXEC_H
+ 
+ extern void pathexec_run(char *,char **,char **);
+-extern int pathexec_env(char *,char *);
++extern int pathexec_env(const char *,const char *);
+ extern void pathexec(char **);
+ 
+ #endif
+diff --git a/pathexec_env.c b/pathexec_env.c
+index 48bba7e..157e71b 100644
+--- a/pathexec_env.c
++++ b/pathexec_env.c
+@@ -8,7 +8,7 @@
+ static stralloc plus;
+ static stralloc tmp;
+ 
+-int pathexec_env(char *s,char *t)
++int pathexec_env(const char *s,const char *t)
+ {
+   if (!s) return 1;
+   if (!stralloc_copys(&tmp,s)) return 0;
+@@ -22,7 +22,6 @@ int pathexec_env(char *s,char *t)
+ 
+ void pathexec(char **argv)
+ {
+-  char *path;
+   char **e;
+   unsigned int elen;
+   unsigned int i;
+diff --git a/recordio.1 b/recordio.1
+new file mode 100644
+index 0000000..e056776
+--- /dev/null
++++ b/recordio.1
+@@ -0,0 +1,75 @@
++.TH recordio 1
++.SH NAME
++recordio \- record the input and output of a program
++.SH SYNTAX
++.B recordio
++.I program
++[
++.I arg ...
++]
++.SH DESCRIPTION
++.B recordio
++runs
++.I program
++with the given arguments.
++It prints lines to stderr
++showing the input and output of
++.IR program .
++
++At the beginning of each line on stderr,
++.B recordio
++inserts the
++.I program
++process ID,
++along with
++.B <
++for input or
++.B >
++for output.
++At the end of each line it inserts a space, a plus sign, or [EOF];
++a space indicates that there was a newline in the input or output,
++and [EOF] indicates the end of input or output.
++
++.B recordio
++prints every packet of input and output immediately.
++It does not attempt to combine packets into coherent stderr lines.
++For example,
++
++.EX
++     recordio sh -c 'cat /dev/fd/8 2>&1' > /dev/null
++.EE
++
++could produce
++
++.EX
++     5135 > cat: /dev/fd/8: Bad file descriptor 
++.br
++     5135 > [EOF]
++.EE
++
++or
++
++.EX
++     5135 > cat: +
++.br
++     5135 > /dev/fd/8+
++.br
++     5135 > : +
++.br
++     5135 > Bad file descriptor 
++.br
++     5135 > [EOF]
++.EE
++
++.B recordio
++uses several lines for long packets
++to guarantee that each line is printed atomically to stderr.
++
++.B recordio
++runs as a child of
++.IR program .
++It exits when it sees the end of
++.IR program 's
++output.
++.SH "SEE ALSO"
++tcpserver(1)
+diff --git a/remoteinfo.h b/remoteinfo.h
+index 2ca779d..0884cc1 100644
+--- a/remoteinfo.h
++++ b/remoteinfo.h
+@@ -5,5 +5,6 @@
+ #include "uint16.h"
+ 
+ extern int remoteinfo(stralloc *,char *,uint16,char *,uint16,unsigned int);
++extern int remoteinfo6(stralloc *,char *,uint16,char *,uint16,unsigned int,uint32);
+ 
+ #endif
+diff --git a/remoteinfo6.c b/remoteinfo6.c
+new file mode 100644
+index 0000000..cf3b7c1
+--- /dev/null
++++ b/remoteinfo6.c
+@@ -0,0 +1,98 @@
++#include "fmt.h"
++#include "buffer.h"
++#include "socket.h"
++#include "error.h"
++#include "iopause.h"
++#include "timeoutconn.h"
++#include "remoteinfo.h"
++
++static struct taia now;
++static struct taia deadline;
++
++static int mywrite(int fd,char *buf,int len)
++{
++  iopause_fd x;
++
++  x.fd = fd;
++  x.events = IOPAUSE_WRITE;
++  for (;;) {
++    taia_now(&now);
++    iopause(&x,1,&deadline,&now);
++    if (x.revents) break;
++    if (taia_less(&deadline,&now)) {
++      errno = error_timeout;
++      return -1;
++    }
++  }
++  return write(fd,buf,len);
++}
++
++static int myread(int fd,char *buf,int len)
++{
++  iopause_fd x;
++
++  x.fd = fd;
++  x.events = IOPAUSE_READ;
++  for (;;) {
++    taia_now(&now);
++    iopause(&x,1,&deadline,&now);
++    if (x.revents) break;
++    if (taia_less(&deadline,&now)) {
++      errno = error_timeout;
++      return -1;
++    }
++  }
++  return read(fd,buf,len);
++}
++
++static int doit(stralloc *out,int s,char ipremote[16],uint16 portremote,char iplocal[16],uint16 portlocal,unsigned int timeout,uint32 netif)
++{
++  buffer b;
++  char bspace[128];
++  char strnum[FMT_ULONG];
++  int numcolons;
++  char ch;
++
++  if (socket_bind6(s,iplocal,0,netif) == -1) return -1;
++  if (timeoutconn6(s,ipremote,113,timeout,netif) == -1) return -1;
++
++  buffer_init(&b,mywrite,s,bspace,sizeof bspace);
++  buffer_put(&b,strnum,fmt_ulong(strnum,portremote));
++  buffer_put(&b," , ",3);
++  buffer_put(&b,strnum,fmt_ulong(strnum,portlocal));
++  buffer_put(&b,"\r\n",2);
++  if (buffer_flush(&b) == -1) return -1;
++
++  buffer_init(&b,myread,s,bspace,sizeof bspace);
++  numcolons = 0;
++  for (;;) {
++    if (buffer_get(&b,&ch,1) != 1) return -1;
++    if ((ch == ' ') || (ch == '\t') || (ch == '\r')) continue;
++    if (ch == '\n') return 0;
++    if (numcolons < 3) {
++      if (ch == ':') ++numcolons;
++    }
++    else {
++      if (!stralloc_append(out,&ch)) return -1;
++      if (out->len > 256) return 0;
++    }
++  }
++}
++
++int remoteinfo6(stralloc *out,char ipremote[16],uint16 portremote,char iplocal[16],uint16 portlocal,unsigned int timeout,uint32 netif)
++{
++  int s;
++  int r;
++
++  if (!stralloc_copys(out,"")) return -1;
++
++  taia_now(&now);
++  taia_uint(&deadline,timeout);
++  taia_add(&deadline,&now,&deadline);
++
++  s = socket_tcp6();
++  if (s == -1) return -1;
++  r = doit(out,s,ipremote,portremote,iplocal,portlocal,timeout,netif);
++  close(s);
++  return r;
++}
+diff --git a/rules.c b/rules.c
+index 1840360..4fc2354 100644
+--- a/rules.c
++++ b/rules.c
+@@ -64,7 +64,7 @@ static int doit(void (*callback)(char *,unsigned int),char *ip,char *host,char *
+ 
+   if (!stralloc_copys(&rules_name,ip)) return -1;
+   while (rules_name.len > 0) {
+-    if (ip[rules_name.len - 1] == '.') {
++    if (ip[rules_name.len - 1] == '.' || ip[rules_name.len - 1] == ':') {
+       r = dorule(callback);
+       if (r) return r;
+     }
+diff --git a/scan_ip6.c b/scan_ip6.c
+new file mode 100644
+index 0000000..ee239fd
+--- /dev/null
++++ b/scan_ip6.c
+@@ -0,0 +1,87 @@
++#include "scan.h"
++#include "ip4.h"
++#include "ip6.h"
++
++/*
++ * IPv6 addresses are really ugly to parse.
++ * Syntax: (h = hex digit)
++ *   1. hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh
++ *   2. any number of 0000 may be abbreviated as "::", but only once
++ *   3. The last two words may be written as IPv4 address
++ */
++
++unsigned int scan_ip6(const char *s,char ip[16])
++{
++  unsigned int i;
++  unsigned int len=0;
++  unsigned long u;
++
++  char suffix[16];
++  int prefixlen=0;
++  int suffixlen=0;
++
++  if ((i=ip4_scan((char*)s,ip+12))) {
++    for (len=0; len<12; ++len) ip[len]=V4mappedprefix[len];
++    return i;
++  }
++  for (i=0; i<16; i++) ip[i]=0;
++  for (;;) {
++    if (*s == ':') {
++      len++;
++      if (s[1] == ':') {	/* Found "::", skip to part 2 */
++	s+=2;
++	len++;
++	break;
++      }
++      s++;
++    }
++    i = scan_xlong((char*)s,&u);
++    if (!i) return 0;
++    if (prefixlen==12 && s[i]=='.') {
++      /* the last 4 bytes may be written as IPv4 address */
++      i=ip4_scan((char*)s,ip+12);
++      if (i)
++	return i+len;
++      else
++	return 0;
++    }
++    ip[prefixlen++] = (u >> 8);
++    ip[prefixlen++] = (u & 255);
++    s += i; len += i;
++    if (prefixlen==16)
++      return len;
++  }
++
++/* part 2, after "::" */
++  for (;;) {
++    if (*s == ':') {
++      if (suffixlen==0)
++	break;
++      s++;
++      len++;
++    } else if (suffixlen!=0)
++      break;
++    i = scan_xlong((char*)s,&u);
++    if (!i) {
++      len--;
++      break;
++    }
++    if (suffixlen+prefixlen<=12 && s[i]=='.') {
++      int j=ip4_scan((char*)s,suffix+suffixlen);
++      if (j) {
++	suffixlen+=4;
++	len+=j;
++	break;
++      } else
++	prefixlen=12-suffixlen;	/* make end-of-loop test true */
++    }
++    suffix[suffixlen++] = (u >> 8);
++    suffix[suffixlen++] = (u & 255);
++    s += i; len += i;
++    if (prefixlen+suffixlen==16)
++      break;
++  }
++  for (i=0; i<suffixlen; i++)
++    ip[16-suffixlen+i] = suffix[i];
++  return len;
++}
+diff --git a/scan_xlong.c b/scan_xlong.c
+new file mode 100644
+index 0000000..6e46d74
+--- /dev/null
++++ b/scan_xlong.c
+@@ -0,0 +1,23 @@
++#include "scan.h"
++
++static int fromhex(unsigned char c) {
++  if (c>='0' && c<='9')
++    return c-'0';
++  else if (c>='A' && c<='F')
++    return c-'A'+10;
++  else if (c>='a' && c<='f')
++    return c-'a'+10;
++  return -1;
++}
++
++unsigned int scan_xlong(char *src,unsigned long *dest) {
++  register const char *tmp=src;
++  register int l=0;
++  register unsigned char c;
++  while ((c=fromhex(*tmp))<16) {
++    l=(l<<4)+c;
++    ++tmp;
++  }
++  *dest=l;
++  return tmp-src;
++}
+diff --git a/socket.h b/socket.h
+index 80fb260..4fba762 100644
+--- a/socket.h
++++ b/socket.h
+@@ -2,21 +2,52 @@
+ #define SOCKET_H
+ 
+ #include "uint16.h"
++#include "uint32.h"
+ 
+ extern int socket_tcp(void);
+ extern int socket_udp(void);
++extern int socket_tcp6(void);
++extern int socket_udp6(void);
+ 
+-extern int socket_connect4(int,char *,uint16);
++extern int socket_connect4(int,const char *,uint16);
++extern int socket_connect6(int s,const char *ip,uint16 port,uint32 scope_id);
+ extern int socket_connected(int);
+-extern int socket_bind4(int,char *,uint16);
+-extern int socket_bind4_reuse(int,char *,uint16);
++extern int socket_bind4(int,const char *,uint16);
++extern int socket_bind4_reuse(int,const char *,uint16);
++extern int socket_bind6(int s,const char *ip,uint16 port,uint32 scope_id);
++extern int socket_bind6_reuse(int s,const char *ip,uint16 port,uint32 scope_id);
+ extern int socket_listen(int,int);
+ extern int socket_accept4(int,char *,uint16 *);
++extern int socket_accept6(int s,char *ip,uint16 *port,uint32 *scope_id);
+ extern int socket_recv4(int,char *,int,char *,uint16 *);
+-extern int socket_send4(int,char *,int,char *,uint16);
++extern int socket_send4(int,const char *,int,const char *,uint16);
++extern int socket_recv6(int s,char *buf,unsigned int len,char *ip,uint16 *port,uint32 *scope_id);
++extern int socket_send6(int s,const char *buf,unsigned int len,const char *ip,uint16 port,uint32 scope_id);
+ extern int socket_local4(int,char *,uint16 *);
+ extern int socket_remote4(int,char *,uint16 *);
++extern int socket_local6(int s,char *ip,uint16 *port,uint32 *scope_id);
++extern int socket_remote6(int s,char *ip,uint16 *port,uint32 *scope_id);
++
++/* enable sending udp packets to the broadcast address */
++extern int socket_broadcast(int);
++/* join a multicast group on the given interface */
++extern int socket_mcjoin4(int,char *,char *);
++extern int socket_mcjoin6(int,char *,int);
++/* leave a multicast group on the given interface */
++extern int socket_mcleave4(int,char *);
++extern int socket_mcleave6(int,char *);
++/* set multicast TTL/hop count for outgoing packets */
++extern int socket_mcttl4(int,char);
++extern int socket_mcttl6(int,char);
++/* enable multicast loopback */
++extern int socket_mcloop4(int,char);
++extern int socket_mcloop6(int,char);
++
++extern const char* socket_getifname(uint32 interface);
++extern uint32 socket_getifidx(const char *ifname);
+ 
+ extern void socket_tryreservein(int,int);
+ 
++extern int noipv6;
++
+ #endif
+diff --git a/socket_accept6.c b/socket_accept6.c
+new file mode 100644
+index 0000000..a8a9a07
+--- /dev/null
++++ b/socket_accept6.c
+@@ -0,0 +1,44 @@
++#include <sys/types.h>
++#include <sys/param.h>
++#include <sys/socket.h>
++#include <netinet/in.h>
++#include "byte.h"
++#include "socket.h"
++#include "ip6.h"
++#include "haveip6.h"
++#include "error.h"
++
++int socket_accept6(int s,char ip[16],uint16 *port,uint32 *scope_id)
++{
++#ifdef LIBC_HAS_IP6
++  struct sockaddr_in6 sa;
++#else
++  struct sockaddr_in sa;
++#endif
++  unsigned int dummy = sizeof sa;
++  int fd;
++
++  fd = accept(s,(struct sockaddr *) &sa,&dummy);
++  if (fd == -1) return -1;
++
++#ifdef LIBC_HAS_IP6
++  if (sa.sin6_family==AF_INET) {
++    struct sockaddr_in *sa4=(struct sockaddr_in*)&sa;
++    byte_copy(ip,12,V4mappedprefix);
++    byte_copy(ip+12,4,(char *) &sa4->sin_addr);
++    uint16_unpack_big((char *) &sa4->sin_port,port);
++    return fd;
++  }
++  byte_copy(ip,16,(char *) &sa.sin6_addr);
++  uint16_unpack_big((char *) &sa.sin6_port,port);
++  if (scope_id) *scope_id=sa.sin6_scope_id;
++
++  return fd;
++#else
++  byte_copy(ip,12,V4mappedprefix);
++  byte_copy(ip+12,4,(char *) &sa.sin_addr);
++  uint16_unpack_big((char *) &sa.sin_port,port);
++  if (scope_id) *scope_id=0;
++  return fd;
++#endif
++}
+diff --git a/socket_bind.c b/socket_bind.c
+index 20830a4..067b4a8 100644
+--- a/socket_bind.c
++++ b/socket_bind.c
+@@ -5,7 +5,7 @@
+ #include "byte.h"
+ #include "socket.h"
+ 
+-int socket_bind4(int s,char ip[4],uint16 port)
++int socket_bind4(int s,const char ip[4],uint16 port)
+ {
+   struct sockaddr_in sa;
+ 
+@@ -17,7 +17,7 @@ int socket_bind4(int s,char ip[4],uint16 port)
+   return bind(s,(struct sockaddr *) &sa,sizeof sa);
+ }
+ 
+-int socket_bind4_reuse(int s,char ip[4],uint16 port)
++int socket_bind4_reuse(int s,const char ip[4],uint16 port)
+ {
+   int opt = 1;
+   setsockopt(s,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof opt);
+diff --git a/socket_bind6.c b/socket_bind6.c
+new file mode 100644
+index 0000000..8a5a7cd
+--- /dev/null
++++ b/socket_bind6.c
+@@ -0,0 +1,45 @@
++#include <sys/types.h>
++#include <sys/param.h>
++#include <sys/socket.h>
++#include <netinet/in.h>
++#include "byte.h"
++#include "socket.h"
++#include "ip6.h"
++#include "haveip6.h"
++#include "error.h"
++
++int socket_bind6(int s,const char ip[16],uint16 port,uint32 scope_id)
++{
++#ifdef LIBC_HAS_IP6
++  struct sockaddr_in6 sa;
++
++  if (noipv6) {
++#endif
++    int i;
++    for (i=0; i<16; i++)
++      if (ip[i]!=0) break;
++    if (i==16 || ip6_isv4mapped(ip))
++      return socket_bind4(s,ip+12,port);
++#ifdef LIBC_HAS_IP6
++  }
++  byte_zero(&sa,sizeof sa);
++  sa.sin6_family = AF_INET6;
++  uint16_pack_big((char *) &sa.sin6_port,port);
++/*  implicit: sa.sin6_flowinfo = 0; */
++  byte_copy((char *) &sa.sin6_addr,16,ip);
++  sa.sin6_scope_id=scope_id;
++
++  return bind(s,(struct sockaddr *) &sa,sizeof sa);
++#else
++  errno=error_proto;
++  return -1;
++#endif
++}
++
++int socket_bind6_reuse(int s,const char ip[16],uint16 port,uint32 scope_id)
++{
++  int opt = 1;
++  setsockopt(s,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof opt);
++  return socket_bind6(s,ip,port,scope_id);
++}
++
+diff --git a/socket_conn.c b/socket_conn.c
+index 35adac4..dcc93ac 100644
+--- a/socket_conn.c
++++ b/socket_conn.c
+@@ -6,7 +6,7 @@
+ #include "byte.h"
+ #include "socket.h"
+ 
+-int socket_connect4(int s,char ip[4],uint16 port)
++int socket_connect4(int s,const char ip[4],uint16 port)
+ {
+   struct sockaddr_in sa;
+ 
+diff --git a/socket_conn6.c b/socket_conn6.c
+new file mode 100644
+index 0000000..0ad886d
+--- /dev/null
++++ b/socket_conn6.c
+@@ -0,0 +1,38 @@
++#include <sys/param.h>
++#include <sys/types.h>
++#include <sys/socket.h>
++#include <netinet/in.h>
++#include <errno.h>
++#include "byte.h"
++#include "socket.h"
++#include "ip6.h"
++#include "haveip6.h"
++#include "uint32.h"
++#include "ip4.h"
++
++int socket_connect6(int s,const char ip[16],uint16 port,uint32 scope_id)
++{
++#ifdef LIBC_HAS_IP6
++  struct sockaddr_in6 sa;
++
++  if (noipv6) {
++#endif
++    if (ip6_isv4mapped(ip))
++      return socket_connect4(s,ip+12,port);
++    if (byte_equal(ip,16,V6loopback))
++      return socket_connect4(s,ip4loopback,port);
++#ifdef LIBC_HAS_IP6
++  }
++  byte_zero(&sa,sizeof sa);
++  sa.sin6_family = PF_INET6;
++  uint16_pack_big((char *) &sa.sin6_port,port);
++  sa.sin6_flowinfo = 0;
++  sa.sin6_scope_id = scope_id;
++  byte_copy((char *) &sa.sin6_addr,16,ip);
++
++  return connect(s,(struct sockaddr *) &sa,sizeof sa);
++#else
++  errno=EPROTONOSUPPORT;
++  return -1;
++#endif
++}
+diff --git a/socket_getifidx.c b/socket_getifidx.c
+new file mode 100644
+index 0000000..452d6d7
+--- /dev/null
++++ b/socket_getifidx.c
+@@ -0,0 +1,8 @@
++#include <sys/types.h>
++#include <sys/socket.h>
++#include <net/if.h>
++#include "socket.h"
++
++uint32 socket_getifidx(const char* ifname) {
++  return if_nametoindex(ifname);
++}
+diff --git a/socket_getifname.c b/socket_getifname.c
+new file mode 100644
+index 0000000..77edff9
+--- /dev/null
++++ b/socket_getifname.c
+@@ -0,0 +1,14 @@
++#include <sys/types.h>
++#include <sys/socket.h>
++#include <net/if.h>
++#include "socket.h"
++
++static char ifname[IFNAMSIZ];
++
++const char* socket_getifname(uint32 interface) {
++  char *tmp=if_indextoname(interface,ifname);
++  if (tmp)
++    return tmp;
++  else
++    return "[unknown]";
++}
+diff --git a/socket_ip4loopback.c b/socket_ip4loopback.c
+new file mode 100644
+index 0000000..1bbbe95
+--- /dev/null
++++ b/socket_ip4loopback.c
+@@ -0,0 +1,2 @@
++
++const char ip4loopback[4] = {127,0,0,1};
+diff --git a/socket_local6.c b/socket_local6.c
+new file mode 100644
+index 0000000..23427c3
+--- /dev/null
++++ b/socket_local6.c
+@@ -0,0 +1,39 @@
++#include <sys/types.h>
++#include <sys/param.h>
++#include <sys/socket.h>
++#include <netinet/in.h>
++#include "byte.h"
++#include "socket.h"
++#include "ip6.h"
++#include "haveip6.h"
++#include "error.h"
++
++int socket_local6(int s,char ip[16],uint16 *port,uint32 *scope_id)
++{
++#ifdef LIBC_HAS_IP6
++  struct sockaddr_in6 sa;
++#else
++  struct sockaddr_in sa;
++#endif
++  unsigned int dummy = sizeof sa;
++
++  if (getsockname(s,(struct sockaddr *) &sa,&dummy) == -1) return -1;
++#ifdef LIBC_HAS_IP6
++  if (sa.sin6_family==AF_INET) {
++    struct sockaddr_in *sa4=(struct sockaddr_in*)&sa;
++    byte_copy(ip,12,V4mappedprefix);
++    byte_copy(ip+12,4,(char *) &sa4->sin_addr);
++    uint16_unpack_big((char *) &sa4->sin_port,port);
++    return 0;
++  }
++  byte_copy(ip,16,(char *) &sa.sin6_addr);
++  uint16_unpack_big((char *) &sa.sin6_port,port);
++  if (scope_id) *scope_id=sa.sin6_scope_id;
++#else
++  byte_copy(ip,12,V4mappedprefix);
++  byte_copy(ip+12,4,(char *) &sa.sin_addr);
++  uint16_unpack_big((char *) &sa.sin_port,port);
++  if (scope_id) *scope_id=0;
++#endif
++  return 0;
++}
+diff --git a/socket_recv6.c b/socket_recv6.c
+new file mode 100644
+index 0000000..a86ca96
+--- /dev/null
++++ b/socket_recv6.c
+@@ -0,0 +1,44 @@
++#include <sys/types.h>
++#include <sys/param.h>
++#include <sys/socket.h>
++#include <netinet/in.h>
++#include "byte.h"
++#include "socket.h"
++#include "ip6.h"
++#include "haveip6.h"
++#include "error.h"
++
++int socket_recv6(int s,char *buf,unsigned int len,char ip[16],uint16 *port,uint32 *scope_id)
++{
++#ifdef LIBC_HAS_IP6
++  struct sockaddr_in6 sa;
++#else
++  struct sockaddr_in sa;
++#endif
++  unsigned int dummy = sizeof sa;
++  int r;
++
++  byte_zero(&sa,dummy);
++  r = recvfrom(s,buf,len,0,(struct sockaddr *) &sa,&dummy);
++  if (r == -1) return -1;
++
++#ifdef LIBC_HAS_IP6
++  if (noipv6) {
++    struct sockaddr_in *sa4=(struct sockaddr_in *)&sa;
++    byte_copy(ip,12,V4mappedprefix);
++    byte_copy(ip+12,4,(char *) &sa4->sin_addr);
++    uint16_unpack_big((char *) &sa4->sin_port,port);
++    return r;
++  }
++  byte_copy(ip,16,(char *) &sa.sin6_addr);
++  uint16_unpack_big((char *) &sa.sin6_port,port);
++  if (scope_id) *scope_id=sa.sin6_scope_id;
++#else
++  byte_copy(ip,12,(char *)V4mappedprefix);
++  byte_copy(ip+12,4,(char *) &sa.sin_addr);
++  uint16_unpack_big((char *) &sa.sin_port,port);
++  if (scope_id) *scope_id=0;
++#endif
++
++  return r;
++}
+diff --git a/socket_remote6.c b/socket_remote6.c
+new file mode 100644
+index 0000000..e60a539
+--- /dev/null
++++ b/socket_remote6.c
+@@ -0,0 +1,39 @@
++#include <sys/types.h>
++#include <sys/param.h>
++#include <sys/socket.h>
++#include <netinet/in.h>
++#include "byte.h"
++#include "socket.h"
++#include "ip6.h"
++#include "haveip6.h"
++#include "error.h"
++
++int socket_remote6(int s,char ip[16],uint16 *port,uint32 *scope_id)
++{
++#ifdef LIBC_HAS_IP6
++  struct sockaddr_in6 sa;
++#else
++  struct sockaddr_in sa;
++#endif
++  unsigned int dummy = sizeof sa;
++
++  if (getpeername(s,(struct sockaddr *) &sa,&dummy) == -1) return -1;
++#ifdef LIBC_HAS_IP6
++  if (sa.sin6_family==AF_INET) {
++    struct sockaddr_in *sa4=(struct sockaddr_in*)&sa;
++    byte_copy(ip,12,V4mappedprefix);
++    byte_copy(ip+12,4,(char *) &sa4->sin_addr);
++    uint16_unpack_big((char *) &sa4->sin_port,port);
++    return 0;
++  }
++  byte_copy(ip,16,(char *) &sa.sin6_addr);
++  uint16_unpack_big((char *) &sa.sin6_port,port);
++  if (scope_id) *scope_id=sa.sin6_scope_id;
++#else
++  byte_copy(ip,12,V4mappedprefix);
++  byte_copy(ip+12,4,(char *) &sa.sin_addr);
++  uint16_unpack_big((char *) &sa.sin_port,port);
++  if (scope_id) *scope_id=0;
++#endif
++  return 0;
++}
+diff --git a/socket_send6.c b/socket_send6.c
+new file mode 100644
+index 0000000..4b2d1e8
+--- /dev/null
++++ b/socket_send6.c
+@@ -0,0 +1,40 @@
++#include <sys/types.h>
++#include <sys/param.h>
++#include <sys/socket.h>
++#include <netinet/in.h>
++#include "byte.h"
++#include "socket.h"
++#include "ip4.h"
++#include "ip6.h"
++#include "haveip6.h"
++#include "error.h"
++
++int socket_send6(int s,const char *buf,unsigned int len,const char ip[16],uint16 port,uint32 scope_id)
++{
++#ifdef LIBC_HAS_IP6
++  struct sockaddr_in6 sa;
++#else
++  struct sockaddr_in sa;
++#endif
++
++  byte_zero(&sa,sizeof sa);
++#ifdef LIBC_HAS_IP6
++  if (noipv6) {
++#endif
++    if (ip6_isv4mapped(ip))
++      return socket_send4(s,buf,len,ip+12,port);
++    if (byte_equal(ip,16,V6loopback))
++      return socket_send4(s,buf,len,ip4loopback,port);
++#ifdef LIBC_HAS_IP6
++    errno=error_proto;
++    return -1;
++  }
++  sa.sin6_family = AF_INET6;
++  uint16_pack_big((char *) &sa.sin6_port,port);
++  byte_copy((char *) &sa.sin6_addr,16,ip);
++  return sendto(s,buf,len,0,(struct sockaddr *) &sa,sizeof sa);
++#else
++  errno=error_proto;
++  return -1;
++#endif
++}
+diff --git a/socket_tcp6.c b/socket_tcp6.c
+new file mode 100644
+index 0000000..74099e2
+--- /dev/null
++++ b/socket_tcp6.c
+@@ -0,0 +1,44 @@
++#include <sys/types.h>
++#include <sys/param.h>
++#include <sys/socket.h>
++#include <netinet/in.h>
++#include <errno.h>
++#include "ndelay.h"
++#include "socket.h"
++#include "haveip6.h"
++#include "error.h"
++
++#ifdef LIBC_HAS_IP6
++int noipv6=0;
++#else
++int noipv6=1;
++#endif
++
++int socket_tcp6(void)
++{
++#ifdef LIBC_HAS_IP6
++  int s;
++
++  if (noipv6) goto compat;
++  s = socket(PF_INET6,SOCK_STREAM,0);
++  if (s == -1) {
++    if (errno == EINVAL || errno == EAFNOSUPPORT) {
++compat:
++      s=socket(AF_INET,SOCK_STREAM,0);
++      noipv6=1;
++      if (s==-1) return -1;
++    } else
++    return -1;
++  }
++  if (ndelay_on(s) == -1) { close(s); return -1; }
++#ifdef IPV6_V6ONLY
++  {
++    int zero=0;
++    setsockopt(s,IPPROTO_IPV6,IPV6_V6ONLY,(void*)&zero,sizeof(zero));
++  }
++#endif
++  return s;
++#else
++  return socket_tcp();
++#endif
++}
+diff --git a/socket_udp6.c b/socket_udp6.c
+new file mode 100644
+index 0000000..3769b1d
+--- /dev/null
++++ b/socket_udp6.c
+@@ -0,0 +1,38 @@
++#include <sys/types.h>
++#include <sys/socket.h>
++#include <netinet/in.h>
++#include <errno.h>
++#include "haveip6.h"
++#include "socket.h"
++
++#ifndef EAFNOSUPPORT
++#define EAFNOSUPPORT EINVAL
++#endif
++
++int socket_udp6(void)
++{
++#ifdef LIBC_HAS_IP6
++  int s;
++
++  if (noipv6) goto compat;
++  s = socket(PF_INET6,SOCK_DGRAM,0);
++  if (s == -1) {
++    if (errno == EINVAL || errno == EAFNOSUPPORT) {
++compat:
++      s=socket(AF_INET,SOCK_DGRAM,0);
++      noipv6=1;
++      if (s==-1) return -1;
++    } else
++    return -1;
++  }
++#ifdef IPV6_V6ONLY
++  {
++    int zero=0;
++    setsockopt(s,IPPROTO_IPV6,IPV6_V6ONLY,(void*)&zero,sizeof(zero));
++  }
++#endif
++  return s;
++#else
++  return socket_udp();
++#endif
++}
+diff --git a/socket_v4mappedprefix.c b/socket_v4mappedprefix.c
+new file mode 100644
+index 0000000..dbed824
+--- /dev/null
++++ b/socket_v4mappedprefix.c
+@@ -0,0 +1,2 @@
++
++const unsigned char V4mappedprefix[12]={0,0,0,0,0,0,0,0,0,0,0xff,0xff};
+diff --git a/socket_v6any.c b/socket_v6any.c
+new file mode 100644
+index 0000000..c6d0cbb
+--- /dev/null
++++ b/socket_v6any.c
+@@ -0,0 +1,2 @@
++
++const unsigned char V6any[16]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+diff --git a/socket_v6loopback.c b/socket_v6loopback.c
+new file mode 100644
+index 0000000..b81ee65
+--- /dev/null
++++ b/socket_v6loopback.c
+@@ -0,0 +1,2 @@
++
++const unsigned char V6loopback[16]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};
+diff --git a/str.h b/str.h
+index ab4aedd..a2a4b75 100644
+--- a/str.h
++++ b/str.h
+@@ -1,13 +1,13 @@
+ #ifndef STR_H
+ #define STR_H
+ 
+-extern unsigned int str_copy(char *,char *);
+-extern int str_diff(char *,char *);
+-extern int str_diffn(char *,char *,unsigned int);
+-extern unsigned int str_len(char *);
+-extern unsigned int str_chr(char *,int);
+-extern unsigned int str_rchr(char *,int);
+-extern int str_start(char *,char *);
++extern unsigned int str_copy(char *,const char *);
++extern int str_diff(const char *,const char *);
++extern int str_diffn(const char *,const char *,unsigned int);
++extern unsigned int str_len(const char *);
++extern unsigned int str_chr(const char *,int);
++extern unsigned int str_rchr(const char *,int);
++extern int str_start(const char *,const char *);
+ 
+ #define str_equal(s,t) (!str_diff((s),(t)))
+ 
+diff --git a/str_chr.c b/str_chr.c
+index 886d6b6..042dfa2 100644
+--- a/str_chr.c
++++ b/str_chr.c
+@@ -1,9 +1,9 @@
+ #include "str.h"
+ 
+-unsigned int str_chr(register char *s,int c)
++unsigned int str_chr(register const char *s,int c)
+ {
+   register char ch;
+-  register char *t;
++  register const char *t;
+ 
+   ch = c;
+   t = s;
+diff --git a/str_diff.c b/str_diff.c
+index 037dcdf..071e7f5 100644
+--- a/str_diff.c
++++ b/str_diff.c
+@@ -1,6 +1,6 @@
+ #include "str.h"
+ 
+-int str_diff(register char *s,register char *t)
++int str_diff(register const char *s,register const char *t)
+ {
+   register char x;
+ 
+diff --git a/str_len.c b/str_len.c
+index 5bd3f62..8411ebf 100644
+--- a/str_len.c
++++ b/str_len.c
+@@ -1,8 +1,8 @@
+ #include "str.h"
+ 
+-unsigned int str_len(char *s)
++unsigned int str_len(const char *s)
+ {
+-  register char *t;
++  register const char *t;
+ 
+   t = s;
+   for (;;) {
+diff --git a/str_start.c b/str_start.c
+index 43430bb..757189d 100644
+--- a/str_start.c
++++ b/str_start.c
+@@ -1,6 +1,6 @@
+ #include "str.h"
+ 
+-int str_start(register char *s,register char *t)
++int str_start(register const char *s,register const char *t)
+ {
+   register char x;
+ 
+diff --git a/stralloc.h b/stralloc.h
+index 7866812..cc17048 100644
+--- a/stralloc.h
++++ b/stralloc.h
+@@ -9,18 +9,20 @@ extern int stralloc_ready(stralloc *,unsigned int);
+ extern int stralloc_readyplus(stralloc *,unsigned int);
+ extern int stralloc_copy(stralloc *,stralloc *);
+ extern int stralloc_cat(stralloc *,stralloc *);
+-extern int stralloc_copys(stralloc *,char *);
+-extern int stralloc_cats(stralloc *,char *);
+-extern int stralloc_copyb(stralloc *,char *,unsigned int);
+-extern int stralloc_catb(stralloc *,char *,unsigned int);
++extern int stralloc_copys(stralloc *,const char *);
++extern int stralloc_cats(stralloc *,const char *);
++extern int stralloc_copyb(stralloc *,const char *,unsigned int);
++extern int stralloc_catb(stralloc *,const char *,unsigned int);
+ extern int stralloc_append(stralloc *,char *); /* beware: this takes a pointer to 1 char */
+-extern int stralloc_starts(stralloc *,char *);
++extern int stralloc_starts(stralloc *,const char *);
+ 
+ #define stralloc_0(sa) stralloc_append(sa,"")
+ 
+ extern int stralloc_catulong0(stralloc *,unsigned long,unsigned int);
+ extern int stralloc_catlong0(stralloc *,long,unsigned int);
+ 
++extern void stralloc_free(stralloc *);
++
+ #define stralloc_catlong(sa,l) (stralloc_catlong0((sa),(l),0))
+ #define stralloc_catuint0(sa,i,n) (stralloc_catulong0((sa),(i),(n)))
+ #define stralloc_catint0(sa,i,n) (stralloc_catlong0((sa),(i),(n)))
+diff --git a/stralloc_catb.c b/stralloc_catb.c
+index b739bed..b606e32 100644
+--- a/stralloc_catb.c
++++ b/stralloc_catb.c
+@@ -1,7 +1,7 @@
+ #include "stralloc.h"
+ #include "byte.h"
+ 
+-int stralloc_catb(stralloc *sa,char *s,unsigned int n)
++int stralloc_catb(stralloc *sa,const char *s,unsigned int n)
+ {
+   if (!sa->s) return stralloc_copyb(sa,s,n);
+   if (!stralloc_readyplus(sa,n + 1)) return 0;
+diff --git a/stralloc_cats.c b/stralloc_cats.c
+index 8b11e94..92cb66e 100644
+--- a/stralloc_cats.c
++++ b/stralloc_cats.c
+@@ -2,7 +2,7 @@
+ #include "str.h"
+ #include "stralloc.h"
+ 
+-int stralloc_cats(stralloc *sa,char *s)
++int stralloc_cats(stralloc *sa,const char *s)
+ {
+   return stralloc_catb(sa,s,str_len(s));
+ }
+diff --git a/stralloc_opyb.c b/stralloc_opyb.c
+index 46b99fc..593029d 100644
+--- a/stralloc_opyb.c
++++ b/stralloc_opyb.c
+@@ -1,7 +1,7 @@
+ #include "stralloc.h"
+ #include "byte.h"
+ 
+-int stralloc_copyb(stralloc *sa,char *s,unsigned int n)
++int stralloc_copyb(stralloc *sa,const char *s,unsigned int n)
+ {
+   if (!stralloc_ready(sa,n + 1)) return 0;
+   byte_copy(sa->s,n,s);
+diff --git a/stralloc_opys.c b/stralloc_opys.c
+index 78594b0..860c7e0 100644
+--- a/stralloc_opys.c
++++ b/stralloc_opys.c
+@@ -2,7 +2,7 @@
+ #include "str.h"
+ #include "stralloc.h"
+ 
+-int stralloc_copys(stralloc *sa,char *s)
++int stralloc_copys(stralloc *sa,const char *s)
+ {
+   return stralloc_copyb(sa,s,str_len(s));
+ }
+diff --git a/tcp-environ.5 b/tcp-environ.5
+new file mode 100644
+index 0000000..fecad70
+--- /dev/null
++++ b/tcp-environ.5
+@@ -0,0 +1,66 @@
++.TH tcp-environ 5
++.SH NAME
++tcp-environ \- TCP-related environment variables
++.SH DESCRIPTION
++The following environment variables
++describe a TCP connection.
++They are set up by
++.BR tcp-env ,
++.BR tcpclient ,
++and
++.BR tcpserver .
++Note that
++.BR TCPLOCALHOST ,
++.BR TCPREMOTEHOST ,
++and
++.B TCPREMOTEINFO
++can contain arbitrary characters.
++.TP 5
++PROTO
++The string
++.BR TCP .
++.TP 5
++TCPLOCALHOST
++The domain name of the local host,
++with uppercase letters converted to lowercase.
++If there is no currently available domain name
++for the local IP address,
++.B TCPLOCALHOST
++is not set.
++.TP 5
++TCPLOCALIP
++The IP address of the local host, in dotted-decimal form.
++.TP 5
++TCPLOCALPORT
++The local TCP port number, in decimal.
++.TP 5
++TCPREMOTEHOST
++The domain name of the remote host,
++with uppercase letters converted to lowercase.
++If there is no currently available domain name
++for the remote IP address,
++.B TCPREMOTEHOST
++is not set.
++.TP 5
++TCPREMOTEINFO
++A connection-specific string, perhaps a username,
++supplied by the remote host
++via 931/1413/IDENT/TAP.
++If the remote host did not supply connection information,
++.B TCPREMOTEINFO
++is not set.
++.TP 5
++TCPREMOTEIP
++The IP address of the remote host.
++.TP 5
++TCPREMOTEPORT
++The remote TCP port number.
++.TP 5
++TCPINTERFACE
++The interface name ("eth0") for IPv6 connections using link-local
++addresses.
++.SH "SEE ALSO"
++tcpclient(1),
++tcpserver(1),
++tcp-env(1),
++tcp(4)
+diff --git a/tcpcat.1 b/tcpcat.1
+new file mode 100644
+index 0000000..4c51ed5
+--- /dev/null
++++ b/tcpcat.1
+@@ -0,0 +1,20 @@
++.TH tcpcat 1
++.SH NAME
++tcpcat \- print data from a TCP port
++.SH SYNTAX
++.B tcpcat
++.I host
++.I port
++.SH DESCRIPTION
++.B tcpcat
++connects to
++.I port
++on
++.I host
++and prints any data it receives.
++
++.B tcpcat
++can be used to transfer binary data.
++It does no conversions.
++.SH "SEE ALSO"
++tcpclient(1)
+diff --git a/tcpclient.1 b/tcpclient.1
+new file mode 100644
+index 0000000..f82f6b3
+--- /dev/null
++++ b/tcpclient.1
+@@ -0,0 +1,173 @@
++.TH tcpclient 1
++.SH NAME
++tcpclient \- create an outgoing TCP connection
++.SH SYNOPSIS
++.B tcpclient
++[
++.B \-46hHrRdDqQv
++]
++[
++.B \-i\fIlocalip
++]
++[
++.B \-p\fIlocalport
++]
++[
++.B \-T\fItimeoutconn
++]
++[
++.B \-l\fIlocalname
++]
++[
++.B \-t\fItimeoutinfo
++]
++[
++.B \-I\fIinterface
++]
++.I host
++.I port
++.I program
++[
++.I arg ...
++]
++.SH DESCRIPTION
++.B tcpclient
++attempts to connect to a TCP server.
++If it is successful, it runs
++.I program
++with the given arguments,
++with descriptor 6 reading from the network
++and descriptor 7 writing to the network.
++
++The server's address is given by
++.I host
++and
++.IR port .
++.I host
++may be 0, referring to the local machine,
++or a dotted-decimal IP address,
++or a host name;
++if a host has several IP addresses,
++.B tcpclient
++tries each in turn.
++.I port
++may be a numeric port number
++or a port name.
++
++.B tcpclient
++sets up several environment variables,
++as described in
++.B tcp-environ(5).
++.SH OPTIONS
++.TP
++.B \-i\fIlocalip
++Use
++.I localip
++as the IP address for the local side of the connection;
++quit if
++.I localip
++is not available.
++.TP
++.B \-p\fIlocalport
++Use
++.I localport
++as the port number for the local side of the connection;
++quit if
++.I localport
++is not available.
++.TP
++.B \-I\fIinterface
++Use
++.I interface
++as the local network interface.  This is only defined for IPv6 sockets
++and needed if you use link-local IPv6 addresses.
++.TP
++.B \-T\fItimeoutconn
++Give up on the
++connection attempt
++after
++.I timeoutconn
++seconds. Default: 60.
++This timeout applies to each IP address tried.
++.TP
++.B \-d
++(Default.)
++Delay sending data for a fraction of a second whenever the
++remote host is responding slowly,
++to make better use of the network.
++.TP
++.B \-D
++Never delay sending data;
++enable TCP_NODELAY.
++This is appropriate for interactive connections.
++.TP
++.B \-q
++Quiet.
++Do not print any messages.
++.TP
++.B \-Q
++(Default.)
++Print error messages.
++.TP
++.B \-v
++Verbose.
++Print all available messages.
++.SH "DATA-GATHERING OPTIONS"
++.TP
++.B \-h
++(Default.)
++Look up the remote host name for
++.BR TCPREMOTEHOST .
++.TP
++.B \-H
++Do not look up the remote host name;
++unset
++.BR TCPREMOTEHOST .
++.TP
++.B \-l\fIlocalname
++Do not look up the local host name;
++use
++.I localname
++for
++.BR TCPLOCALHOST .
++.TP
++.B \-r
++(Default.)
++Attempt to obtain
++.B TCPREMOTEINFO
++from the remote host.
++.TP
++.B \-R
++Do not attempt to obtain
++.B TCPREMOTEINFO
++from the remote host.
++.TP
++.B \-t\fItimeoutinfo
++Give up on the 
++.B TCPREMOTEINFO
++connection attempt
++after
++.I timeoutinfo
++seconds. Default: 26.
++.TP
++.B \-4
++Fall back to IPv4 sockets.  This is necessary for terminally broken
++systems like OpenBSD which will not let IPv6 sockets connect to
++V4-mapped IPv6 addresses.  Please note that this also applies to DNS
++lookups, so you will have to use an DNS resolver with an IPv6 address to
++connect to IPv6 systems.  Use \fBDNSCACHEIP\fR to set the DNS resolver
++IP dynamically.
++.TP
++.B \-6
++Force IPv6 mode in UCSPI environment variables, even for
++IPv4 connections.  This will set \fB$PROTO\fR to \fBTCP6\fR and put
++IPv4-mapped IPv6 addresses in \fBTCPLOCALIP\fR and \fBTCPREMOTEIP\fR.
++.SH "SEE ALSO"
++date@(1),
++finger@(1),
++http@(1),
++mconnect(1),
++tcpcat(1),
++tcpserver(1),
++who@(1),
++tcp-environ(5)
+diff --git a/tcpclient.c b/tcpclient.c
+index 9f6d7f2..77b1ad5 100644
+--- a/tcpclient.c
++++ b/tcpclient.c
+@@ -9,6 +9,7 @@
+ #include "scan.h"
+ #include "str.h"
+ #include "ip4.h"
++#include "ip6.h"
+ #include "uint16.h"
+ #include "socket.h"
+ #include "fd.h"
+@@ -20,6 +21,7 @@
+ #include "timeoutconn.h"
+ #include "remoteinfo.h"
+ #include "dns.h"
++#include "byte.h"
+ 
+ #define FATAL "tcpclient: fatal: "
+ #define CONNECT "tcpclient: unable to connect to "
+@@ -31,27 +33,30 @@ void nomem(void)
+ void usage(void)
+ {
+   strerr_die1x(100,"tcpclient: usage: tcpclient \
+-[ -hHrRdDqQv ] \
++[ -46hHrRdDqQv ] \
+ [ -i localip ] \
+ [ -p localport ] \
+ [ -T timeoutconn ] \
+ [ -l localname ] \
+ [ -t timeoutinfo ] \
++[ -I interface ] \
+ host port program");
+ }
+ 
++int forcev6 = 0;
+ int verbosity = 1;
+ int flagdelay = 1;
+ int flagremoteinfo = 1;
+ int flagremotehost = 1;
+ unsigned long itimeout = 26;
+ unsigned long ctimeout[2] = { 2, 58 };
++uint32 netif = 0;
+ 
+-char iplocal[4] = { 0,0,0,0 };
++char iplocal[16] = { 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 };
+ uint16 portlocal = 0;
+ char *forcelocal = 0;
+ 
+-char ipremote[4];
++char ipremote[16];
+ uint16 portremote;
+ 
+ char *hostname;
+@@ -61,12 +66,13 @@ static stralloc moreaddresses;
+ static stralloc tmp;
+ static stralloc fqdn;
+ char strnum[FMT_ULONG];
+-char ipstr[IP4_FMT];
++char ipstr[IP6_FMT];
+ 
+ char seed[128];
+ 
+ main(int argc,char **argv)
+ {
++  int fakev4=0;
+   unsigned long u;
+   int opt;
+   char *x;
+@@ -80,8 +86,10 @@ main(int argc,char **argv)
+   close(7);
+   sig_ignore(sig_pipe);
+  
+-  while ((opt = getopt(argc,argv,"dDvqQhHrRi:p:t:T:l:")) != opteof)
++  while ((opt = getopt(argc,argv,"46dDvqQhHrRi:p:t:T:l:I:")) != opteof)
+     switch(opt) {
++      case '4': noipv6 = 1; break;
++      case '6': forcev6 = 1; break;
+       case 'd': flagdelay = 1; break;
+       case 'D': flagdelay = 0; break;
+       case 'v': verbosity = 2; break;
+@@ -97,7 +105,8 @@ main(int argc,char **argv)
+ 		if (optarg[j] == '+') ++j;
+ 		scan_ulong(optarg + j,&ctimeout[1]);
+ 		break;
+-      case 'i': if (!ip4_scan(optarg,iplocal)) usage(); break;
++      case 'i': if (!scan_ip6(optarg,iplocal)) usage(); break;
++      case 'I': netif=socket_getifidx(optarg); break;
+       case 'p': scan_ulong(optarg,&u); portlocal = u; break;
+       default: usage();
+     }
+@@ -108,8 +117,8 @@ main(int argc,char **argv)
+ 
+   hostname = *argv;
+   if (!hostname) usage();
+-  if (str_equal(hostname,"")) hostname = "127.0.0.1";
+-  if (str_equal(hostname,"0")) hostname = "127.0.0.1";
++  if (!hostname[0] || str_equal(hostname,"0"))
++    hostname = (noipv6?"127.0.0.1":"::1");
+ 
+   x = *++argv;
+   if (!x) usage();
+@@ -127,33 +136,36 @@ main(int argc,char **argv)
+   if (!*++argv) usage();
+ 
+   if (!stralloc_copys(&tmp,hostname)) nomem();
+-  if (dns_ip4_qualify(&addresses,&fqdn,&tmp) == -1)
++  if (dns_ip6_qualify(&addresses,&fqdn,&tmp) == -1)
+     strerr_die4sys(111,FATAL,"temporarily unable to figure out IP address for ",hostname,": ");
+-  if (addresses.len < 4)
++  if (addresses.len < 16)
+     strerr_die3x(111,FATAL,"no IP address for ",hostname);
+ 
+-  if (addresses.len == 4) {
++  if (addresses.len == 16) {
+     ctimeout[0] += ctimeout[1];
+     ctimeout[1] = 0;
+   }
+ 
+   for (cloop = 0;cloop < 2;++cloop) {
+     if (!stralloc_copys(&moreaddresses,"")) nomem();
+-    for (j = 0;j + 4 <= addresses.len;j += 4) {
+-      s = socket_tcp();
++    for (j = 0;j + 16 <= addresses.len;j += 4) {
++      s = socket_tcp6();
+       if (s == -1)
+         strerr_die2sys(111,FATAL,"unable to create socket: ");
+-      if (socket_bind4(s,iplocal,portlocal) == -1)
++      if (socket_bind6(s,iplocal,portlocal,netif) == -1)
+         strerr_die2sys(111,FATAL,"unable to bind socket: ");
+-      if (timeoutconn(s,addresses.s + j,portremote,ctimeout[cloop]) == 0)
++      if (timeoutconn6(s,addresses.s + j,portremote,ctimeout[cloop],netif) == 0)
+         goto CONNECTED;
+       close(s);
+       if (!cloop && ctimeout[1] && (errno == error_timeout)) {
+-	if (!stralloc_catb(&moreaddresses,addresses.s + j,4)) nomem();
++	if (!stralloc_catb(&moreaddresses,addresses.s + j,16)) nomem();
+       }
+       else {
+         strnum[fmt_ulong(strnum,portremote)] = 0;
+-        ipstr[ip4_fmt(ipstr,addresses.s + j)] = 0;
++	if (ip6_isv4mapped(addresses.s+j))
++	  ipstr[ip4_fmt(ipstr,addresses.s + j + 12)] = 0;
++	else
++	  ipstr[ip6_fmt(ipstr,addresses.s + j)] = 0;
+         strerr_warn5(CONNECT,ipstr," port ",strnum,": ",&strerr_sys);
+       }
+     }
+@@ -169,37 +181,46 @@ main(int argc,char **argv)
+   if (!flagdelay)
+     socket_tcpnodelay(s); /* if it fails, bummer */
+ 
+-  if (!pathexec_env("PROTO","TCP")) nomem();
+-
+-  if (socket_local4(s,iplocal,&portlocal) == -1)
++  if (socket_local6(s,iplocal,&portlocal,&netif) == -1)
+     strerr_die2sys(111,FATAL,"unable to get local address: ");
+ 
++  if (!forcev6 && (ip6_isv4mapped(iplocal) || byte_equal(iplocal,16,V6any)))
++    fakev4=1;
++
++  if (!pathexec_env("PROTO",fakev4?"TCP":"TCP6")) nomem();
++
+   strnum[fmt_ulong(strnum,portlocal)] = 0;
+   if (!pathexec_env("TCPLOCALPORT",strnum)) nomem();
+-  ipstr[ip4_fmt(ipstr,iplocal)] = 0;
++  if (fakev4)
++    ipstr[ip4_fmt(ipstr,iplocal+12)] = 0;
++  else
++    ipstr[ip6_fmt(ipstr,iplocal)] = 0;
+   if (!pathexec_env("TCPLOCALIP",ipstr)) nomem();
+ 
+   x = forcelocal;
+   if (!x)
+-    if (dns_name4(&tmp,iplocal) == 0) {
++    if (dns_name6(&tmp,iplocal) == 0) {
+       if (!stralloc_0(&tmp)) nomem();
+       x = tmp.s;
+     }
+   if (!pathexec_env("TCPLOCALHOST",x)) nomem();
+ 
+-  if (socket_remote4(s,ipremote,&portremote) == -1)
++  if (socket_remote6(s,ipremote,&portremote,&netif) == -1)
+     strerr_die2sys(111,FATAL,"unable to get remote address: ");
+ 
+   strnum[fmt_ulong(strnum,portremote)] = 0;
+   if (!pathexec_env("TCPREMOTEPORT",strnum)) nomem();
+-  ipstr[ip4_fmt(ipstr,ipremote)] = 0;
++  if (fakev4)
++    ipstr[ip4_fmt(ipstr,ipremote+12)] = 0;
++  else
++    ipstr[ip6_fmt(ipstr,ipremote)] = 0;
+   if (!pathexec_env("TCPREMOTEIP",ipstr)) nomem();
+   if (verbosity >= 2)
+     strerr_warn4("tcpclient: connected to ",ipstr," port ",strnum,0);
+ 
+   x = 0;
+   if (flagremotehost)
+-    if (dns_name4(&tmp,ipremote) == 0) {
++    if (dns_name6(&tmp,ipremote) == 0) {
+       if (!stralloc_0(&tmp)) nomem();
+       x = tmp.s;
+     }
+@@ -207,7 +228,7 @@ main(int argc,char **argv)
+ 
+   x = 0;
+   if (flagremoteinfo)
+-    if (remoteinfo(&tmp,ipremote,portremote,iplocal,portlocal,itimeout) == 0) {
++    if (remoteinfo6(&tmp,ipremote,portremote,iplocal,portlocal,itimeout,netif) == 0) {
+       if (!stralloc_0(&tmp)) nomem();
+       x = tmp.s;
+     }
+diff --git a/tcprules.1 b/tcprules.1
+new file mode 100644
+index 0000000..084165b
+--- /dev/null
++++ b/tcprules.1
+@@ -0,0 +1,221 @@
++.TH tcprules 1
++.SH NAME
++tcprules \- compile rules for tcpserver
++.SH SYNOPSIS
++.B tcprules
++.I rules.cdb
++.I rules.tmp
++.SH OVERVIEW
++.B tcpserver
++optionally follows rules to decide whether a TCP connection is acceptable.
++For example, a rule of
++
++.EX
++   18.23.0.32:deny
++.EE
++
++prohibits connections from IP address 18.23.0.32.
++
++.B tcprules
++reads rules from its standard input
++and writes them into
++.I rules.cdb
++in a binary format suited
++for quick access by
++.BR tcpserver .
++
++.B tcprules
++can be used while
++.B tcpserver
++is running:
++it ensures that
++.I rules.cdb
++is updated atomically.
++It does this by first writing the rules to
++.I rules.tmp
++and then moving
++.I rules.tmp
++on top of
++.IR rules.cdb .
++If
++.I rules.tmp
++already exists, it is destroyed.
++The directories containing
++.I rules.cdb
++and
++.I rules.tmp
++must be writable to
++.BR tcprules ;
++they must also be on the same filesystem.
++
++If there is a problem with the input,
++.B tcprules
++complains and leaves
++.I rules.cdb
++alone.
++
++The binary
++.I rules.cdb
++format is portable across machines.
++.SH "RULE FORMAT"
++A rule takes up one line.
++A file containing rules
++may also contain comments: lines beginning with # are ignored.
++
++Each rule contains an
++.BR address ,
++a colon,
++and a list of
++.BR instructions ,
++with no extra spaces.
++When
++.B tcpserver
++receives a connection from that address,
++it follows the instructions.
++.SH "ADDRESSES"
++.B tcpserver
++starts by looking for a rule with address
++.IR TCPREMOTEINFO\fB@\fITCPREMOTEIP .
++If it doesn't find one, or if
++.I TCPREMOTEINFO
++is not set, it tries the address
++.IR TCPREMOTEIP .
++If that doesn't work, it tries shorter and shorter prefixes of
++.I TCPREMOTEIP
++ending with a dot.
++If none of them work, it tries the empty string.
++
++For example, here are some rules:
++
++.EX
++   joe@127.0.0.1:first
++.br
++   18.23.0.32:second
++.br
++   127.:third
++.br
++   :fourth
++.br
++   ::1:fifth
++.EE
++
++If
++.I TCPREMOTEIP
++is
++.BR 10.119.75.38 ,
++.B tcpserver
++will follow the
++.B fourth
++instructions.
++
++If
++.I TCPREMOTEIP
++is
++.BR ::1 ,
++.B tcpserver
++will follow the
++.B fifth
++instructions.  Note that you cannot detect IPv4 mapped addresses by
++matching "::ffff", as those addresses will be converted to IPv4 before
++looking at the rules.
++
++If
++.I TCPREMOTEIP
++is
++.BR 18.23.0.32 ,
++.B tcpserver
++will follow the
++.B second
++instructions.
++
++If
++.I TCPREMOTEINFO
++is
++.B bill
++and
++.I TCPREMOTEIP
++is
++.BR 127.0.0.1 ,
++.B tcpserver
++will follow the
++.B third
++instructions.
++
++If
++.I TCPREMOTEINFO
++is
++.B joe
++and
++.I TCPREMOTEIP
++is
++.BR 127.0.0.1 ,
++.B tcpserver
++will follow the
++.B first
++instructions.
++.SH "ADDRESS RANGES"
++.B tcprules
++treats
++.B 1.2.3.37-53:ins
++as an abbreviation
++for the rules
++.BR 1.2.3.37:ins ,
++.BR 1.2.3.38:ins ,
++and so on up through
++.BR 1.2.3.53:ins .
++Similarly,
++.BR 10.2-3.:ins
++is an abbreviation for
++.B 10.2.:ins
++and
++.BR 10.3.:ins .
++.SH "INSTRUCTIONS"
++The instructions in a rule must begin with either
++.B allow
++or
++.BR deny .
++.B deny
++tells
++.B tcpserver
++to drop the connection without running anything.
++For example, the rule
++
++.EX
++   :deny
++.EE
++
++tells
++.B tcpserver
++to drop all connections that aren't handled by more specific rules.
++
++The instructions may continue with some environment variables,
++in the format
++.IR ,VAR="VALUE" .
++.B tcpserver
++adds
++.I VAR=VALUE
++to the current environment.
++For example,
++
++.EX
++   10.0.:allow,RELAYCLIENT="@fix.me"
++.EE
++
++adds
++.B RELAYCLIENT=@fix.me
++to the environment.
++The quotes here may be replaced by any repeated character:
++
++.EX
++   10.0.:allow,RELAYCLIENT=/@fix.me/
++.EE
++
++Any number of variables may be listed:
++
++.EX
++   127.0.0.1:allow,RELAYCLIENT="",TCPLOCALHOST="movie.edu"
++.EE
++.SH "SEE ALSO"
++tcprulescheck(1),
++tcpserver(1),
++tcp-environ(5)
+diff --git a/tcprules.c b/tcprules.c
+index a684ac5..83519c8 100644
+--- a/tcprules.c
++++ b/tcprules.c
+@@ -123,8 +123,15 @@ main(int argc,char **argv)
+     }
+     line.len = len; /* for die_bad() */
+ 
+-    colon = byte_chr(x,len,':');
+-    if (colon == len) continue;
++    colon = 0;
++    for (;;) {
++      int tmp;
++      tmp = byte_chr(x + colon,len - colon,':');
++      colon += tmp;
++      if (colon == len) continue;
++      if (byte_equal(x+colon+1,4,"deny") || byte_equal(x+colon+1,5,"allow")) break;
++      ++colon;
++    }
+ 
+     if (!stralloc_copyb(&address,x,colon)) nomem();
+     if (!stralloc_copys(&data,"")) nomem();
+diff --git a/tcprulescheck.1 b/tcprulescheck.1
+new file mode 100644
+index 0000000..3f0de24
+--- /dev/null
++++ b/tcprulescheck.1
+@@ -0,0 +1,25 @@
++.TH tcprulescheck 1
++.SH NAME
++tcprulescheck \- try out rules for tcpserver
++.SH SYNTAX
++.B tcprulescheck
++.I rules.cdb
++.I tcpremoteip
++[
++.I tcpremoteinfo
++]
++.SH DESCRIPTION
++.B tcprulescheck
++says what
++.B tcpserver
++will do with a connection from
++IP address
++.IR tcpremoteip ,
++following the rules compiled into
++.I rules.cdb
++by
++.BR tcprules .
++.SH "SEE ALSO"
++tcprules(1),
++tcpserver(1),
++tcp-environ(5)
+diff --git a/tcpserver.1 b/tcpserver.1
+new file mode 100644
+index 0000000..72c5ca0
+--- /dev/null
++++ b/tcpserver.1
+@@ -0,0 +1,266 @@
++.TH tcpserver 1
++.SH NAME
++tcpserver \- accept incoming TCP connections
++.SH SYNOPSIS
++.B tcpserver
++[
++.B \-146jpPhHrRoOdDqQv
++]
++[
++.B \-c\fIlimit
++]
++[
++.B \-x\fIrules.cdb
++]
++[
++.B \-B\fIbanner
++]
++[
++.B \-g\fIgid
++]
++[
++.B \-u\fIuid
++]
++[
++.B \-b\fIbacklog
++]
++[
++.B \-l\fIlocalname
++]
++[
++.B \-t\fItimeout
++]
++[
++.B \-I\fIinterface
++]
++.I host
++.I port
++.I program
++[
++.I arg ...
++]
++.SH DESCRIPTION
++.B tcpserver
++waits for connections from TCP clients.
++For each connection, it runs
++.I program
++with the given arguments,
++with descriptor 0 reading from the network
++and descriptor 1 writing to the network.
++
++The server's address is given by
++.I host
++and
++.IR port .
++.I host
++can be 0, allowing connections from any host;
++or a particular IP address,
++allowing connections only to that address;
++or a host name, allowing connections to the first IP address
++for that host.
++.I port
++may be a numeric port number
++or a port name.
++If
++.I port
++is 0,
++.B tcpserver
++will choose a free port.
++
++.B tcpserver
++sets up several environment variables,
++as described in
++.B tcp-environ(5).
++
++.B tcpserver
++exits when it receives SIGTERM.
++.SH "OPTIONS"
++.TP
++.B \-c\fIlimit
++Do not handle more than
++.I limit
++simultaneous connections.
++If there are
++.I limit
++simultaneous copies of
++.I program
++running, defer acceptance of a new connection
++until one copy finishes.
++.I limit
++must be a positive integer.
++Default: 40.
++.TP
++.B \-x\fIrules.cdb
++Follow the rules compiled into
++.I rules.cdb
++by
++.BR tcprules .
++These rules may specify setting environment variables
++or rejecting connections from bad sources.
++
++.B tcpserver
++does not read
++.I rules.cdb
++into memory;
++you can rerun
++.B tcprules
++to change
++.BR tcpserver 's
++behavior on the fly.
++.TP
++.B \-B\fIbanner
++Write
++.I banner
++to the network immediately after each connection is made.
++.B tcpserver
++writes
++.I banner
++before looking up
++.BR TCPREMOTEHOST ,
++before looking up
++.BR TCPREMOTEINFO ,
++and before checking
++.IR rules.cdb .
++
++This feature can be used to reduce latency in protocols
++where the client waits for a greeting from the server.
++.TP
++.B \-g\fIgid
++Switch group ID to
++.I gid
++after preparing to receive connections.
++.I gid
++must be a positive integer.
++.TP
++.B \-u\fIuid
++Switch user ID to 
++.I uid
++after preparing to receive connections.
++.I uid
++must be a positive integer.
++.TP
++.B \-1
++After preparing to receive connections,
++print the local port number to standard output.
++.TP
++.B \-4
++Fall back to IPv4 sockets.  This is necessary for terminally broken
++systems like OpenBSD which will not let IPv6 sockets connect to
++V4-mapped IPv6 addresses.  Please note that this also applies to DNS
++lookups, so you will have to use an DNS resolver with an IPv6 address to
++accept IPv6 connections.  Use \fBDNSCACHEIP\fR to set the DNS resolver
++IP dynamically.
++.TP
++.B \-6
++Force IPv6 mode in UCSPI environment variables, even for
++IPv4 connections.  This will set \fB$PROTO\fR to \fBTCP6\fR and put
++IPv4-mapped IPv6 addresses in \fBTCPLOCALIP\fR and \fBTCPREMOTEIP\fR.
++.TP
++.B \-I\fIinterface
++Bind to the network interface
++.I interface
++("eth0" on Linux, for example).  This is only defined and needed for
++IPv6 link-local addresses.
++.TP
++.B \-b\fIbacklog
++Allow up to
++.I backlog
++simultaneous SYN_RECEIVEDs.
++Default: 20.
++On some systems,
++.I backlog
++is silently limited to 5.
++See
++.BR listen (2)
++for more details.
++.TP
++.B \-o
++Leave IP options alone.
++If the client is sending packets along an IP source route,
++send packets back along the same route.
++.TP
++.B \-O
++(Default.)
++Kill IP options.
++A client can still use source routing to connect and to send data,
++but packets will be sent back along the default route.
++.TP
++.B \-d
++(Default.)
++Delay sending data for a fraction of a second whenever the
++remote host is responding slowly,
++to make better use of the network.
++.TP
++.B \-D
++Never delay sending data;
++enable TCP_NODELAY.
++This is appropriate for interactive connections.
++.TP
++.B \-q
++Quiet.
++Do not print any messages.
++.TP
++.B \-Q
++(Default.)
++Print error messages.
++.TP
++.B \-v
++Verbose.
++Print all available messages.
++.SH "DATA-GATHERING OPTIONS"
++.TP
++.B \-p
++Paranoid.
++After looking up the remote host name,
++look up the IP addresses for that name,
++and make sure one of them matches
++.BR TCPREMOTEIP .
++If none of them do,
++unset
++.BR TCPREMOTEHOST .
++.TP
++.B \-P
++(Default.)
++Not paranoid.
++.TP
++.B \-h
++(Default.)
++Look up the remote host name and set
++.BR TCPREMOTEHOST .
++.TP
++.B \-H
++Do not look up the remote host name.
++.TP
++.B \-l\fIlocalname
++Do not look up the local host name;
++use
++.I localname
++for
++.BR TCPLOCALHOST .
++.TP
++.B \-r
++(Default.)
++Attempt to obtain
++.B TCPREMOTEINFO
++from the remote host.
++.TP
++.B \-R
++Do not attempt to obtain
++.B TCPREMOTEINFO
++from the remote host.
++.TP
++.B \-t\fItimeout
++Give up on the 
++.B TCPREMOTEINFO
++connection attempt
++after
++.I timeout
++seconds. Default: 26.
++.SH "SEE ALSO"
++argv0(1),
++fixcr(1),
++recordio(1),
++tcpclient(1),
++tcprules(1),
++listen(2),
++tcp-environ(5)
+diff --git a/tcpserver.c b/tcpserver.c
+index 979a0be..aab637f 100644
+--- a/tcpserver.c
++++ b/tcpserver.c
+@@ -7,6 +7,7 @@
+ #include "fmt.h"
+ #include "scan.h"
+ #include "ip4.h"
++#include "ip6.h"
+ #include "fd.h"
+ #include "exit.h"
+ #include "env.h"
+@@ -28,6 +29,7 @@
+ #include "sig.h"
+ #include "dns.h"
+ 
++int forcev6 = 0;
+ int verbosity = 1;
+ int flagkillopts = 1;
+ int flagdelay = 1;
+@@ -36,20 +38,21 @@ int flagremoteinfo = 1;
+ int flagremotehost = 1;
+ int flagparanoid = 0;
+ unsigned long timeout = 26;
++uint32 netif = 0;
+ 
+ static stralloc tcpremoteinfo;
+ 
+ uint16 localport;
+ char localportstr[FMT_ULONG];
+-char localip[4];
+-char localipstr[IP4_FMT];
++char localip[16];
++char localipstr[IP6_FMT];
+ static stralloc localhostsa;
+ char *localhost = 0;
+ 
+ uint16 remoteport;
+ char remoteportstr[FMT_ULONG];
+-char remoteip[4];
+-char remoteipstr[IP4_FMT];
++char remoteip[16];
++char remoteipstr[IP6_FMT];
+ static stralloc remotehostsa;
+ char *remotehost = 0;
+ 
+@@ -96,12 +99,12 @@ void safecats(char *s)
+     if (ch < 33) ch = '?';
+     if (ch > 126) ch = '?';
+     if (ch == '%') ch = '?'; /* logger stupidity */
+-    if (ch == ':') ch = '?';
++/*    if (ch == ':') ch = '?'; */
+     append(&ch);
+   }
+   cats("...");
+ }
+-void env(char *s,char *t)
++void env(const char *s,const char *t)
+ {
+   if (!pathexec_env(s,t)) drop_nomem();
+ }
+@@ -135,9 +138,16 @@ void found(char *data,unsigned int datalen)
+ 
+ void doit(int t)
+ {
++  int fakev4=0;
+   int j;
++  uint32 scope_id;
+ 
+-  remoteipstr[ip4_fmt(remoteipstr,remoteip)] = 0;
++  if (!forcev6 && ip6_isv4mapped(remoteip))
++    fakev4=1;
++  if (fakev4)
++    remoteipstr[ip4_fmt(remoteipstr,remoteip+12)] = 0;
++  else
++    remoteipstr[ip6_fmt(remoteipstr,remoteip)] = 0;
+ 
+   if (verbosity >= 2) {
+     strnum[fmt_ulong(strnum,getpid())] = 0;
+@@ -155,30 +165,40 @@ void doit(int t)
+       strerr_die2sys(111,DROP,"unable to print banner: ");
+   }
+ 
+-  if (socket_local4(t,localip,&localport) == -1)
++  if (socket_local6(t,localip,&localport,&scope_id) == -1)
+     strerr_die2sys(111,DROP,"unable to get local address: ");
+ 
+-  localipstr[ip4_fmt(localipstr,localip)] = 0;
++  if (fakev4)
++    localipstr[ip4_fmt(localipstr,localip+12)] = 0;
++  else
++    localipstr[ip6_fmt(localipstr,localip)] = 0;
+   remoteportstr[fmt_ulong(remoteportstr,remoteport)] = 0;
+ 
+   if (!localhost)
+-    if (dns_name4(&localhostsa,localip) == 0)
++    if (dns_name6(&localhostsa,localip) == 0)
+       if (localhostsa.len) {
+ 	if (!stralloc_0(&localhostsa)) drop_nomem();
+ 	localhost = localhostsa.s;
+       }
+-  env("PROTO","TCP");
++  env("PROTO",fakev4?"TCP":"TCP6");
+   env("TCPLOCALIP",localipstr);
++  localipstr[ip6_fmt(localipstr,localip)]=0;
++  env("TCP6LOCALIP",localipstr);
++
+   env("TCPLOCALPORT",localportstr);
++  env("TCP6LOCALPORT",localportstr);
+   env("TCPLOCALHOST",localhost);
++  env("TCP6LOCALHOST",localhost);
++  if (!fakev4 && scope_id)
++    env("TCP6INTERFACE",socket_getifname(scope_id));
+ 
+   if (flagremotehost)
+-    if (dns_name4(&remotehostsa,remoteip) == 0)
++    if (dns_name6(&remotehostsa,remoteip) == 0)
+       if (remotehostsa.len) {
+ 	if (flagparanoid)
+-	  if (dns_ip4(&tmp,&remotehostsa) == 0)
+-	    for (j = 0;j + 4 <= tmp.len;j += 4)
+-	      if (byte_equal(remoteip,4,tmp.s + j)) {
++	  if (dns_ip6(&tmp,&remotehostsa) == 0)
++	    for (j = 0;j + 16 <= tmp.len;j += 16)
++	      if (byte_equal(remoteip,16,tmp.s + j)) {
+ 		flagparanoid = 0;
+ 		break;
+ 	      }
+@@ -188,15 +208,20 @@ void doit(int t)
+ 	}
+       }
+   env("TCPREMOTEIP",remoteipstr);
++  remoteipstr[ip6_fmt(remoteipstr,remoteip)]=0;
++  env("TCP6REMOTEIP",remoteipstr);
+   env("TCPREMOTEPORT",remoteportstr);
++  env("TCP6REMOTEPORT",remoteportstr);
+   env("TCPREMOTEHOST",remotehost);
++  env("TCP6REMOTEHOST",remotehost);
+ 
+   if (flagremoteinfo) {
+-    if (remoteinfo(&tcpremoteinfo,remoteip,remoteport,localip,localport,timeout) == -1)
++    if (remoteinfo6(&tcpremoteinfo,remoteip,remoteport,localip,localport,timeout,netif) == -1)
+       flagremoteinfo = 0;
+     if (!stralloc_0(&tcpremoteinfo)) drop_nomem();
+   }
+   env("TCPREMOTEINFO",flagremoteinfo ? tcpremoteinfo.s : 0);
++  env("TCP6REMOTEINFO",flagremoteinfo ? tcpremoteinfo.s : 0);
+ 
+   if (fnrules) {
+     int fdrules;
+@@ -206,7 +231,15 @@ void doit(int t)
+       if (!flagallownorules) drop_rules();
+     }
+     else {
+-      if (rules(found,fdrules,remoteipstr,remotehost,flagremoteinfo ? tcpremoteinfo.s : 0) == -1) drop_rules();
++      int fakev4=0;
++      char* temp;
++      if (!forcev6 && ip6_isv4mapped(remoteip))
++	fakev4=1;
++      if (fakev4)
++	temp=remoteipstr+7;
++      else
++	temp=remoteipstr;
++      if (rules(found,fdrules,temp,remotehost,flagremoteinfo ? tcpremoteinfo.s : 0) == -1) drop_rules();
+       close(fdrules);
+     }
+   }
+@@ -240,7 +273,7 @@ void usage(void)
+ {
+   strerr_warn1("\
+ tcpserver: usage: tcpserver \
+-[ -1UXpPhHrRoOdDqQv ] \
++[ -461UXpPhHrRoOdDqQv ] \
+ [ -c limit ] \
+ [ -x rules.cdb ] \
+ [ -B banner ] \
+@@ -249,6 +282,7 @@ tcpserver: usage: tcpserver \
+ [ -b backlog ] \
+ [ -l localname ] \
+ [ -t timeout ] \
++[ -I interface ] \
+ host port program",0);
+   _exit(100);
+ }
+@@ -299,8 +333,8 @@ main(int argc,char **argv)
+   unsigned long u;
+   int s;
+   int t;
+- 
+-  while ((opt = getopt(argc,argv,"dDvqQhHrR1UXx:t:u:g:l:b:B:c:pPoO")) != opteof)
++
++  while ((opt = getopt(argc,argv,"46dDvqQhHrR1UXx:t:u:g:l:b:B:c:I:pPoO")) != opteof)
+     switch(opt) {
+       case 'b': scan_ulong(optarg,&backlog); break;
+       case 'c': scan_ulong(optarg,&limit); break;
+@@ -325,7 +359,10 @@ main(int argc,char **argv)
+ 		x = env_get("GID"); if (x) scan_ulong(x,&gid); break;
+       case 'u': scan_ulong(optarg,&uid); break;
+       case 'g': scan_ulong(optarg,&gid); break;
++      case 'I': netif=socket_getifidx(optarg); break;
+       case '1': flag1 = 1; break;
++      case '4': noipv6 = 1; break;
++      case '6': forcev6 = 1; break;
+       case 'l': localhost = optarg; break;
+       default: usage();
+     }
+@@ -337,8 +374,7 @@ main(int argc,char **argv)
+  
+   hostname = *argv++;
+   if (!hostname) usage();
+-  if (str_equal(hostname,"")) hostname = "0.0.0.0";
+-  if (str_equal(hostname,"0")) hostname = "0.0.0.0";
++  if (str_equal(hostname,"")) hostname = "0";
+ 
+   x = *argv++;
+   if (!x) usage();
+@@ -348,7 +384,7 @@ main(int argc,char **argv)
+     se = getservbyname(x,"tcp");
+     if (!se)
+       strerr_die3x(111,FATAL,"unable to figure out port number for ",x);
+-    localport = ntohs(se->s_port);
++    uint16_unpack_big((char*)&se->s_port,&localport);
+   }
+ 
+   if (!*argv) usage();
+@@ -358,20 +394,26 @@ main(int argc,char **argv)
+   sig_catch(sig_term,sigterm);
+   sig_ignore(sig_pipe);
+  
+-  if (!stralloc_copys(&tmp,hostname))
+-    strerr_die2x(111,FATAL,"out of memory");
+-  if (dns_ip4_qualify(&addresses,&fqdn,&tmp) == -1)
+-    strerr_die4sys(111,FATAL,"temporarily unable to figure out IP address for ",hostname,": ");
+-  if (addresses.len < 4)
+-    strerr_die3x(111,FATAL,"no IP address for ",hostname);
+-  byte_copy(localip,4,addresses.s);
+-
+-  s = socket_tcp();
++  if (str_equal(hostname,"0")) {
++    byte_zero(localip,sizeof localip);
++  } else {
++    if (!stralloc_copys(&tmp,hostname))
++      strerr_die2x(111,FATAL,"out of memory");
++    if (dns_ip6_qualify(&addresses,&fqdn,&tmp) == -1)
++      strerr_die4sys(111,FATAL,"temporarily unable to figure out IP address for ",hostname,": ");
++    if (addresses.len < 16)
++      strerr_die3x(111,FATAL,"no IP address for ",hostname);
++    byte_copy(localip,16,addresses.s);
++    if (ip6_isv4mapped(localip))
++      noipv6=1;
++  }
++
++  s = socket_tcp6();
+   if (s == -1)
+     strerr_die2sys(111,FATAL,"unable to create socket: ");
+-  if (socket_bind4_reuse(s,localip,localport) == -1)
++  if (socket_bind6_reuse(s,localip,localport,netif) == -1)
+     strerr_die2sys(111,FATAL,"unable to bind: ");
+-  if (socket_local4(s,localip,&localport) == -1)
++  if (socket_local6(s,localip,&localport,&netif) == -1)
+     strerr_die2sys(111,FATAL,"unable to get local address: ");
+   if (socket_listen(s,backlog) == -1)
+     strerr_die2sys(111,FATAL,"unable to listen: ");
+@@ -399,7 +441,7 @@ main(int argc,char **argv)
+     while (numchildren >= limit) sig_pause();
+ 
+     sig_unblock(sig_child);
+-    t = socket_accept4(s,remoteip,&remoteport);
++    t = socket_accept6(s,remoteip,&remoteport,&netif);
+     sig_block(sig_child);
+ 
+     if (t == -1) continue;
+diff --git a/timeoutconn.h b/timeoutconn.h
+index 7f9dcc9..01e6a75 100644
+--- a/timeoutconn.h
++++ b/timeoutconn.h
+@@ -2,7 +2,9 @@
+ #define TIMEOUTCONN_H
+ 
+ #include "uint16.h"
++#include "uint32.h"
+ 
+ extern int timeoutconn(int,char *,uint16,unsigned int);
++extern int timeoutconn6(int,char *,uint16,unsigned int,uint32);
+ 
+ #endif
+diff --git a/timeoutconn6.c b/timeoutconn6.c
+new file mode 100644
+index 0000000..75e9f5a
+--- /dev/null
++++ b/timeoutconn6.c
+@@ -0,0 +1,34 @@
++#include "ndelay.h"
++#include "socket.h"
++#include "iopause.h"
++#include "error.h"
++#include "timeoutconn.h"
++
++int timeoutconn6(int s,char ip[16],uint16 port,unsigned int timeout,uint32 netif)
++{
++  struct taia now;
++  struct taia deadline;
++  iopause_fd x;
++
++  if (socket_connect6(s,ip,port,netif) == -1) {
++    if ((errno != error_wouldblock) && (errno != error_inprogress)) return -1;
++    x.fd = s;
++    x.events = IOPAUSE_WRITE;
++    taia_now(&now);
++    taia_uint(&deadline,timeout);
++    taia_add(&deadline,&now,&deadline);
++    for (;;) {
++      taia_now(&now);
++      iopause(&x,1,&deadline,&now);
++      if (x.revents) break;
++      if (taia_less(&deadline,&now)) {
++	errno = error_timeout; /* note that connect attempt is continuing */
++	return -1;
++      }
++    }
++    if (!socket_connected(s)) return -1;
++  }
++
++  if (ndelay_off(s) == -1) return -1;
++  return 0;
++}
+diff --git a/tryip6.c b/tryip6.c
+new file mode 100644
+index 0000000..e0d7cfb
+--- /dev/null
++++ b/tryip6.c
+@@ -0,0 +1,8 @@
++#include <sys/types.h>
++#include <sys/socket.h>
++#include <netinet/in.h>
++
++main() {
++  struct sockaddr_in6 sa;
++  sa.sin6_family = PF_INET6;
++}
+diff --git a/who@.1 b/who@.1
+new file mode 100644
+index 0000000..0c13f84
+--- /dev/null
++++ b/who@.1
+@@ -0,0 +1,32 @@
++.TH who@ 1
++.SH NAME
++who@ \- print list of active users on a host
++.SH SYNTAX
++.B who@
++[
++.I host
++]
++.SH DESCRIPTION
++.B who@
++connects to TCP port 11 (Systat) on
++.I host
++and prints any data it receives.
++It removes CR and converts unprintable characters to a visible format.
++
++If
++.I host
++is not supplied,
++.B who@
++connects to the local host.
++
++Some computers respond to port 11 with a list of active users.
++For example, they may be running
++
++.EX
++     tcpserver 0 11 who &
++.EE
++.SH "SEE ALSO"
++cat(1),
++delcr(1),
++tcpclient(1),
++tcpserver(1)
+-- 
+1.6.0.3
+
author	Gerrit Pape <pape@smarden.org>	2009-10-13 22:57:51 +0000
committer	Dmitry Bogatov <KAction@debian.org>	2018-11-29 05:18:33 +0000
commit	14d23cfcb6ead69c05e2e36c854b33e27aa44787 (patch)
tree	da65c5de16bc0779936fa6bf8c28be1a596569e9
parent	d98777c7f350bf18c2673e312ae1f9adb4d16eec (diff)