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Tom Gundersen 2013-01-07 15:14:01 +01:00
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README
.deps
.libs
*.cache
configure
Makefile
stamp-*
*.la
*.lo
*.log
*.so.2
Makefile.in
aclocal.m4
config.guess
config.h
config.h.in
config.rpath
config.status
config.sub
depcomp
install-sh
libtool
ltmain.sh
missing

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GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999
Copyright (C) 1991, 1999 Free Software Foundation, Inc.
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
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# This file is part of nss-myhostname.
#
# Copyright 2008 Lennart Poettering
#
# nss-myhostname is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public License
# as published by the Free Software Foundation, either version 2.1 of
# the License, or (at your option) any later version.
#
# nss-myhostname is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with nss-myhostname. If not, If not, see
# <http://www.gnu.org/licenses/>.
ACLOCAL_AMFLAGS = -I m4
lib_LTLIBRARIES = libnss_myhostname.la
EXTRA_DIST=bootstrap.sh README LICENSE
SUBDIRS=doc
AM_CPPFLAGS = -include $(top_builddir)/config.h
MAINTAINERCLEANFILES=README
noinst_DATA = README
README:
rm -f README
$(MAKE) -C doc README
cd $(srcdir) && ln -s doc/README README
homepage: all dist
test -d $$HOME/homepage/private
mkdir -p $$HOME/homepage/private/projects/nss-myhostname
cp nss-myhostname-@PACKAGE_VERSION@.tar.gz doc/README.html doc/style.css $$HOME/homepage/private/projects/nss-myhostname
ln -sf README.html $$HOME/homepage/private/projects/nss-myhostname/index.html
.PHONY: homepage
libnss_myhostname_la_SOURCES = \
nss-myhostname.c \
ifconf.h
if LEGACY
libnss_myhostname_la_SOURCES += legacy.c
else
libnss_myhostname_la_SOURCES += netlink.c
endif
libnss_myhostname_la_LDFLAGS = \
-avoid-version \
-module \
-export-dynamic \
-shrext .so.2
install-exec-hook:
rm -f $(DESTDIR)$(libdir)/libnss_myhostname.la
rm -f $(DESTDIR)$(libdir)/libnss_myhostname_minimal.la
uninstall-hook:
rm -f $(DESTDIR)$(libdir)/libnss_myhostname.so.2
rm -f $(DESTDIR)$(libdir)/libnss_myhostname_minimal.so.2

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#!/bin/bash
# This file is part of nss-myhostname.
#
# Copyright 2008 Lennart Poettering
#
# nss-myhostname is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public License
# as published by the Free Software Foundation, either version 2.1 of
# the License, or (at your option) any later version.
#
# nss-myhostname is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with nss-myhostname. If not, If not, see
# <http://www.gnu.org/licenses/>.
VERSION=1.9
run_versioned() {
local P
local V
V=$(echo "$2" | sed -e 's,\.,,g')
if [ -e "`which $1$V 2> /dev/null`" ] ; then
P="$1$V"
else
if [ -e "`which $1-$2 2> /dev/null`" ] ; then
P="$1-$2"
else
P="$1"
fi
fi
shift 2
"$P" "$@"
}
set -ex
if [ "x$1" = "xam" ] ; then
run_versioned automake "$VERSION" -a -c --foreign
./config.status
else
rm -rf autom4te.cache
rm -f config.cache
touch config.rpath
test "x$LIBTOOLIZE" = "x" && LIBTOOLIZE=libtoolize
mkdir -p m4
"$LIBTOOLIZE" -c --force
run_versioned aclocal "$VERSION" -I m4
run_versioned autoconf 2.59 -Wall
run_versioned autoheader 2.59
run_versioned automake "$VERSION" --copy --foreign --add-missing
if test "x$NOCONFIGURE" = "x"; then
CFLAGS="-g -O0" ./configure --sysconfdir=/etc --localstatedir=/var "$@"
make clean
fi
fi

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# -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.
# This file is part of nss-myhostname.
#
# Copyright 2008 Lennart Poettering
#
# nss-myhostname is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public License
# as published by the Free Software Foundation, either version 2.1 of
# the License, or (at your option) any later version.
#
# nss-myhostname is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with nss-myhostname. If not, If not, see
# <http://www.gnu.org/licenses/>.
AC_PREREQ(2.62)
AC_INIT([nss-myhostname],[0.3],[mzzlubfganzr (at) 0pointer (dot) de])
AC_CONFIG_SRCDIR([nss-myhostname.c])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_MACRO_DIR(m4)
AC_USE_SYSTEM_EXTENSIONS
AC_SYS_LARGEFILE
AM_INIT_AUTOMAKE([foreign 1.9 -Wall -Wno-portability silent-rules tar-pax subdir-objects dist-bzip2])
AC_SUBST(PACKAGE_URL, [http://0pointer.de/lennart/projects/nss-myhostname/])
ac_default_prefix="/"
AC_CANONICAL_HOST
case "$host_os" in
linux*) legacy=false ;;
*) legacy=true ;;
esac
AM_CONDITIONAL([LEGACY], [test x$legacy = xtrue])
# Checks for programs.
AC_PROG_CC
AC_PROG_CC_C99
AC_PROG_CPP
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_MAKE_SET
# GCC flags
DESIRED_FLAGS="-Wall -W -Wextra -pedantic -pipe -Wformat -Wold-style-definition -Wdeclaration-after-statement -Wfloat-equal -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wredundant-decls -Wmissing-noreturn -Wshadow -Wendif-labels -Wpointer-arith -Wcast-align -Wwrite-strings -Winline -Wno-unused-parameter -ffast-math -fvisibility=hidden -fdiagnostics-show-option"
for flag in $DESIRED_FLAGS ; do
CC_CHECK_CFLAGS([$flag], [CFLAGS="$CFLAGS $flag"])
done
# libtool stuff
AC_DISABLE_STATIC
LT_PREREQ(2.2)
LT_INIT
# Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS([arpa/inet.h fcntl.h inttypes.h netdb.h netinet/in.h stdlib.h string.h sys/socket.h sys/time.h unistd.h nss.h sys/ioctl.h])
# Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_TYPE_SIZE_T
AC_HEADER_TIME
# Checks for library functions.
AC_FUNC_MALLOC
AC_FUNC_SELECT_ARGTYPES
AC_CHECK_FUNCS([gethostbyaddr gethostbyname gettimeofday inet_ntoa memset select socket strcspn strdup strerror strncasecmp strcasecmp strspn])
# LYNX documentation generation
ZP_LYNX_DOC
AC_CONFIG_FILES([Makefile doc/Makefile doc/README.html ])
AC_OUTPUT

2
src/nss-myhostname/doc/.gitignore vendored Normal file
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@ -0,0 +1,2 @@
README
README.html

38
src/nss-myhostname/doc/Makefile.am Normal file
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# This file is part of nss-myhostname.
#
# Copyright 2008 Lennart Poettering
#
# nss-myhostname is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public License
# as published by the Free Software Foundation, either version 2.1 of
# the License, or (at your option) any later version.
#
# nss-myhostname is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with nss-myhostname. If not, If not, see
# <http://www.gnu.org/licenses/>.
dist_html_DATA = README.html style.css
EXTRA_DIST = README.html.in
MAINTAINERCLEANFILES = README.html
CLEANFILES =
if USE_LYNX
dist_doc_DATA = README
MAINTAINERCLEANFILES += README
README: README.html
lynx --dump $^ | sed 's,file://localhost/.*/doc/README.html,README,' > $@
CLEANFILES += README
endif
tidy: README.html
tidy -qe < README.html ; true
.PHONY: tidy

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<?xml version="1.0" encoding="iso-8859-1"?> <!-- -*-html-helper-*- -->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>nss-myhostname @PACKAGE_VERSION@</title>
<link rel="stylesheet" type="text/css" href="style.css" />
</head>
<body>
<h1><a name="top">nss-myhostname @PACKAGE_VERSION@</a></h1>
<p><i>Copyright 2005-2011 Lennart Poettering &lt;@PACKAGE_BUGREPORT@&gt;</i></p>
<ul class="toc">
<li><a href="#license">License</a></li>
<li><a href="#news">News</a></li>
<li><a href="#overview">Overview</a></li>
<li><a href="#status">Current Status</a></li>
<li><a href="#documentation">Documentation</a></li>
<li><a href="#requirements">Requirements</a></li>
<li><a href="#installation">Installation</a></li>
<li><a href="#acks">Acknowledgements</a></li>
<li><a href="#download">Download</a></li>
</ul>
<h2><a name="license">License</a></h2>
<p>This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 2.1 of the
License, or (at your option) any later version.</p>
<p>This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.</p>
<h2><a name="news">News</a></h2>
<div class="news-date">Mon May 9 2011: </div>
<p class="news-text"><a href="@PACKAGE_URL@nss-myhostname-0.3.tar.gz">Version
0.3</a> released. Changes include: Always return locally configured IP
addresses first, use 127.0.0.2/::1 only as fallback if no addresses
are configured.</p>
<div class="news-date">Mon Oct 27 2008: </div>
<p class="news-text"><a
href="@PACKAGE_URL@nss-myhostname-0.2.tar.gz">Version 0.2</a>
released. Changes include: Update for IPv6 and newest glibc NSS interfaces</p>
<div class="news-date">Sat Nov 19 2005: </div>
<p class="news-text"><a
href="@PACKAGE_URL@nss-myhostname-0.1.tar.gz">Version 0.1</a>
released. Initial release.</p>
<h2><a name="overview">Overview</a></h2>
<p><tt>nss-myhostname</tt> is a plugin for the GNU Name Service Switch
(NSS) functionality of the GNU C Library (<tt>glibc</tt>) providing
host name resolution for the locally configured system hostname as
returned by <tt>gethostname(2)</tt>. Various software relies on an
always resolvable local host name. When using dynamic hostnames this
is usually achieved by patching <tt>/etc/hosts</tt> at the same time
as changing the host name. This however is not ideal since it requires
a writable <tt>/etc</tt> file system and is fragile because the file
might be edited by the administrator at the same
time. <tt>nss-myhostname</tt> simply returns all locally configure
public IP addresses, or -- if none are configured -- the IPv4
address <tt>127.0.0.2</tt> (wich is on the local loopback) and the
IPv6 address <tt>::1</tt> (which is the local host) for whatever
system hostname is configured locally. Patching <tt>/etc/hosts</tt>
is thus no longer necessary.</p>
<h2><a name="status">Current Status</a></h2>
<p>It works!</p>
<h2><a name="documentation">Documentation</a></h2>
<p>After compiling and installing <tt>nss-myhostname</tt> you'll find a
new NSS modules in <tt>/lib</tt>:</p>
<ul>
<li><tt>libnss_myhostname.so.2</tt></li>
</ul>
<p>To activate the NSS modules you have to edit
<tt>/etc/nsswitch.conf</tt> and add <tt>myhostname</tt> to the
line starting with "<tt>hosts:</tt>". On Debian this looks like
this:</p>
<pre># /etc/nsswitch.conf
passwd: compat
group: compat
shadow: compat
hosts: files dns <b>myhostname</b>
networks: files
protocols: db files
services: db files
ethers: db files
rpc: db files
netgroup: nis</pre>
<p>That's it. You should now always be able to resolve your local
system hostname. For a quick check
use <tt>glibc</tt>'s <tt>getent</tt> tool:
<pre>$ getent ahosts `hostname`
::1 STREAM omega
::1 DGRAM
::1 RAW
127.0.0.2 STREAM
127.0.0.2 DGRAM
127.0.0.2 RAW
</pre>
<p>In this case the local host name is <i>omega</i>.</p>
<p>It is recommended to put <tt>myhostname</tt> last in
the <tt>nsswitch.conf</tt> line to make sure that this mapping is only
used as fallback, and any DNS or <tt>/etc/hosts</tt> based mapping takes
precedence.</p>
<h2><a name="requirements">Requirements</a></h2>
<p><tt>nss-myhostname</tt> uses NSS interfaces that are specific to modern <tt>glibc</tt>'s.</p>
<p><tt>nss-myhostname</tt> was developed and tested on Fedora 15 from
May 2011, it should work on most other Linux distributions since it
uses GNU autoconf and GNU libtool for source code configuration and
shared library management.</p>
<h2><a name="installation">Installation</a></h2>
<p>As this package is made with the GNU autotools you should run
<tt>./configure</tt> inside the distribution directory for configuring
the source tree. After that you should run <tt>make</tt> for
compilation and <tt>make install</tt> (as root) for installation of
<tt>nss-myhostname</tt>.</p>
<h2><a name="acks">Acknowledgements</a></h2>
<p>None so far.</p>
<h2><a name="download">Download</a></h2>
<p>The newest release is always available from <a href="@PACKAGE_URL@">@PACKAGE_URL@</a></p>
<p>The current release is <a href="@PACKAGE_URL@nss-myhostname-@PACKAGE_VERSION@.tar.gz">@PACKAGE_VERSION@</a></p>
<p>Get <tt>nss-myhostname</tt>'s development sources from the <a href="http://git.or.cz/">GIT</a> <a href="git://git.0pointer.de/nss-myhostname">repository</a> (<a href="http://git.0pointer.de/?p=nss-myhostname.git">gitweb</a>): </p>
<pre>git clone git://git.0pointer.de/nss-myhostname</pre>
<hr/>
<address class="grey">Lennart Poettering &lt;@PACKAGE_BUGREPORT@&gt;, May 2011</address>
</body>
</html>

25
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@ -0,0 +1,25 @@
/***
This file is part of nss-myhostname.
Copyright 2008 Lennart Poettering
nss-myhostname is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation, either version 2.1
of the License, or (at your option) any later version.
nss-myhostname is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with nss-myhostname. If not, If not, see
<http://www.gnu.org/licenses/>.
***/
body { color: black; background-color: white; }
a:link, a:visited { color: #900000; }
div.news-date { font-size: 80%; font-style: italic; }
pre { background-color: #f0f0f0; padding: 0.4cm; }
.grey { color: #8f8f8f; font-size: 80%; }

74
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
#ifndef fooifconfhfoo
#define fooifconfhfoo
#include <sys/socket.h>
/***
This file is part of nss-myhostname.
Copyright 2008-2011 Lennart Poettering
nss-myhostname is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation; either version 2.1 of
the License, or (at your option) any later version.
nss-myhostname is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with nss-myhostname; If not, see
<http://www.gnu.org/licenses/>.
***/
#include <inttypes.h>
#include <sys/types.h>
#include <assert.h>
struct address {
unsigned char family;
uint8_t address[16];
unsigned char scope;
int ifindex;
};
#define _public_ __attribute__ ((visibility("default")))
#define _hidden_ __attribute__ ((visibility("hidden")))
int ifconf_acquire_addresses(struct address **_list, unsigned *_n_list) _hidden_;
static inline size_t PROTO_ADDRESS_SIZE(int proto) {
assert(proto == AF_INET || proto == AF_INET6);
return proto == AF_INET6 ? 16 : 4;
}
static inline int address_compare(const void *_a, const void *_b) {
const struct address *a = _a, *b = _b;
/* Order lowest scope first, IPv4 before IPv6, lowest interface index first */
if (a->scope < b->scope)
return -1;
if (a->scope > b->scope)
return 1;
if (a->family == AF_INET && b->family == AF_INET6)
return -1;
if (a->family == AF_INET6 && b->family == AF_INET)
return 1;
if (a->ifindex < b->ifindex)
return -1;
if (a->ifindex > b->ifindex)
return 1;
return 0;
}
#endif

92
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@ -0,0 +1,92 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of nss-myhostname.
Copyright 2008-2011 Lennart Poettering
Copyright 2011 Robert millan
nss-myhostname is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation; either version 2.1 of
the License, or (at your option) any later version.
nss-myhostname is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with nss-myhostname; If not, see
<http://www.gnu.org/licenses/>.
***/
#include <sys/types.h>
#include <errno.h>
#include <ifaddrs.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include "ifconf.h"
int ifconf_acquire_addresses(struct address **_list, unsigned *_n_list) {
struct address *list = NULL;
unsigned n_list = 0;
struct ifaddrs *ifa = NULL;
int r = 1;
struct ifaddrs *i;
int ifindex = 0;
if (getifaddrs(&ifa) == -1) {
r = -errno;
goto finish;
}
for (i = ifa; i != NULL; i = i->ifa_next) {
int af;
const void *cp;
struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) i->ifa_addr;
struct sockaddr_in *in = (struct sockaddr_in *) i->ifa_addr;
if (! i->ifa_addr)
continue;
af = i->ifa_addr->sa_family;
if (af != AF_INET && af != AF_INET6)
continue;
list = realloc(list, (n_list+1) * sizeof(struct address));
if (!list) {
r = -ENOMEM;
goto finish;
}
if (af == AF_INET6)
cp = &in6->sin6_addr;
else
cp = &in->sin_addr;
list[n_list].family = af;
list[n_list].scope = 0;
memcpy(list[n_list].address, cp, PROTO_ADDRESS_SIZE(af));
list[n_list].ifindex = ifindex++;
n_list++;
}
finish:
if (ifa)
freeifaddrs(ifa);
if (r < 0)
free(list);
else {
qsort(list, n_list, sizeof(struct address), address_compare);
*_list = list;
*_n_list = n_list;
}
return r;
}

258
src/nss-myhostname/m4/attributes.m4 Normal file
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@ -0,0 +1,258 @@
dnl Macros to check the presence of generic (non-typed) symbols.
dnl Copyright (c) 2006-2007 Diego Pettenò <flameeyes@gmail.com>
dnl Copyright (c) 2006-2007 xine project
dnl
dnl This program is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 2, or (at your option)
dnl any later version.
dnl
dnl This program is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
dnl GNU General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with this program; if not, write to the Free Software
dnl Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
dnl 02110-1301, USA.
dnl
dnl As a special exception, the copyright owners of the
dnl macro gives unlimited permission to copy, distribute and modify the
dnl configure scripts that are the output of Autoconf when processing the
dnl Macro. You need not follow the terms of the GNU General Public
dnl License when using or distributing such scripts, even though portions
dnl of the text of the Macro appear in them. The GNU General Public
dnl License (GPL) does govern all other use of the material that
dnl constitutes the Autoconf Macro.
dnl
dnl This special exception to the GPL applies to versions of the
dnl Autoconf Macro released by this project. When you make and
dnl distribute a modified version of the Autoconf Macro, you may extend
dnl this special exception to the GPL to apply to your modified version as
dnl well.
AC_DEFUN([CC_CHECK_CFLAGS_SILENT], [
AC_CACHE_VAL(AS_TR_SH([cc_cv_cflags_$1]),
[ac_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $1"
AC_COMPILE_IFELSE([int a;],
[eval "AS_TR_SH([cc_cv_cflags_$1])='yes'"],
[eval "AS_TR_SH([cc_cv_cflags_$1])='no'"])
CFLAGS="$ac_save_CFLAGS"
])
AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes],
[$2], [$3])
])
AC_DEFUN([CC_CHECK_CFLAGS], [
AC_CACHE_CHECK([if $CC supports $1 flag],
AS_TR_SH([cc_cv_cflags_$1]),
CC_CHECK_CFLAGS_SILENT([$1]) dnl Don't execute actions here!
)
AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes],
[$2], [$3])
])
AC_DEFUN([CC_CHECK_LDFLAGS], [
AC_CACHE_CHECK([if $CC supports $1 flag],
AS_TR_SH([cc_cv_ldflags_$1]),
[ac_save_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS $1"
AC_LINK_IFELSE([int main() { return 1; }],
[eval "AS_TR_SH([cc_cv_ldflags_$1])='yes'"],
[eval "AS_TR_SH([cc_cv_ldflags_$1])="])
LDFLAGS="$ac_save_LDFLAGS"
])
AS_IF([eval test x$]AS_TR_SH([cc_cv_ldflags_$1])[ = xyes],
[$2], [$3])
])
dnl Check for a -Werror flag or equivalent. -Werror is the GCC
dnl and ICC flag that tells the compiler to treat all the warnings
dnl as fatal. We usually need this option to make sure that some
dnl constructs (like attributes) are not simply ignored.
dnl
dnl Other compilers don't support -Werror per se, but they support
dnl an equivalent flag:
dnl - Sun Studio compiler supports -errwarn=%all
AC_DEFUN([CC_CHECK_WERROR], [
AC_CACHE_CHECK(
[for $CC way to treat warnings as errors],
[cc_cv_werror],
[CC_CHECK_CFLAGS_SILENT([-Werror], [cc_cv_werror=-Werror],
[CC_CHECK_CFLAGS_SILENT([-errwarn=%all], [cc_cv_werror=-errwarn=%all])])
])
])
AC_DEFUN([CC_CHECK_ATTRIBUTE], [
AC_REQUIRE([CC_CHECK_WERROR])
AC_CACHE_CHECK([if $CC supports __attribute__(( ifelse([$2], , [$1], [$2]) ))],
AS_TR_SH([cc_cv_attribute_$1]),
[ac_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $cc_cv_werror"
AC_COMPILE_IFELSE([$3],
[eval "AS_TR_SH([cc_cv_attribute_$1])='yes'"],
[eval "AS_TR_SH([cc_cv_attribute_$1])='no'"])
CFLAGS="$ac_save_CFLAGS"
])
AS_IF([eval test x$]AS_TR_SH([cc_cv_attribute_$1])[ = xyes],
[AC_DEFINE(
AS_TR_CPP([SUPPORT_ATTRIBUTE_$1]), 1,
[Define this if the compiler supports __attribute__(( ifelse([$2], , [$1], [$2]) ))]
)
$4],
[$5])
])
AC_DEFUN([CC_ATTRIBUTE_CONSTRUCTOR], [
CC_CHECK_ATTRIBUTE(
[constructor],,
[void __attribute__((constructor)) ctor() { int a; }],
[$1], [$2])
])
AC_DEFUN([CC_ATTRIBUTE_FORMAT], [
CC_CHECK_ATTRIBUTE(
[format], [format(printf, n, n)],
[void __attribute__((format(printf, 1, 2))) printflike(const char *fmt, ...) { fmt = (void *)0; }],
[$1], [$2])
])
AC_DEFUN([CC_ATTRIBUTE_FORMAT_ARG], [
CC_CHECK_ATTRIBUTE(
[format_arg], [format_arg(printf)],
[char *__attribute__((format_arg(1))) gettextlike(const char *fmt) { fmt = (void *)0; }],
[$1], [$2])
])
AC_DEFUN([CC_ATTRIBUTE_VISIBILITY], [
CC_CHECK_ATTRIBUTE(
[visibility_$1], [visibility("$1")],
[void __attribute__((visibility("$1"))) $1_function() { }],
[$2], [$3])
])
AC_DEFUN([CC_ATTRIBUTE_NONNULL], [
CC_CHECK_ATTRIBUTE(
[nonnull], [nonnull()],
[void __attribute__((nonnull())) some_function(void *foo, void *bar) { foo = (void*)0; bar = (void*)0; }],
[$1], [$2])
])
AC_DEFUN([CC_ATTRIBUTE_UNUSED], [
CC_CHECK_ATTRIBUTE(
[unused], ,
[void some_function(void *foo, __attribute__((unused)) void *bar);],
[$1], [$2])
])
AC_DEFUN([CC_ATTRIBUTE_SENTINEL], [
CC_CHECK_ATTRIBUTE(
[sentinel], ,
[void some_function(void *foo, ...) __attribute__((sentinel));],
[$1], [$2])
])
AC_DEFUN([CC_ATTRIBUTE_DEPRECATED], [
CC_CHECK_ATTRIBUTE(
[deprecated], ,
[void some_function(void *foo, ...) __attribute__((deprecated));],
[$1], [$2])
])
AC_DEFUN([CC_ATTRIBUTE_ALIAS], [
CC_CHECK_ATTRIBUTE(
[alias], [weak, alias],
[void other_function(void *foo) { }
void some_function(void *foo) __attribute__((weak, alias("other_function")));],
[$1], [$2])
])
AC_DEFUN([CC_ATTRIBUTE_MALLOC], [
CC_CHECK_ATTRIBUTE(
[malloc], ,
[void * __attribute__((malloc)) my_alloc(int n);],
[$1], [$2])
])
AC_DEFUN([CC_ATTRIBUTE_PACKED], [
CC_CHECK_ATTRIBUTE(
[packed], ,
[struct astructure { char a; int b; long c; void *d; } __attribute__((packed));],
[$1], [$2])
])
AC_DEFUN([CC_ATTRIBUTE_CONST], [
CC_CHECK_ATTRIBUTE(
[const], ,
[int __attribute__((const)) twopow(int n) { return 1 << n; } ],
[$1], [$2])
])
AC_DEFUN([CC_FLAG_VISIBILITY], [
AC_REQUIRE([CC_CHECK_WERROR])
AC_CACHE_CHECK([if $CC supports -fvisibility=hidden],
[cc_cv_flag_visibility],
[cc_flag_visibility_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $cc_cv_werror"
CC_CHECK_CFLAGS_SILENT([-fvisibility=hidden],
cc_cv_flag_visibility='yes',
cc_cv_flag_visibility='no')
CFLAGS="$cc_flag_visibility_save_CFLAGS"])
AS_IF([test "x$cc_cv_flag_visibility" = "xyes"],
[AC_DEFINE([SUPPORT_FLAG_VISIBILITY], 1,
[Define this if the compiler supports the -fvisibility flag])
$1],
[$2])
])
AC_DEFUN([CC_FUNC_EXPECT], [
AC_REQUIRE([CC_CHECK_WERROR])
AC_CACHE_CHECK([if compiler has __builtin_expect function],
[cc_cv_func_expect],
[ac_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $cc_cv_werror"
AC_COMPILE_IFELSE(
[int some_function() {
int a = 3;
return (int)__builtin_expect(a, 3);
}],
[cc_cv_func_expect=yes],
[cc_cv_func_expect=no])
CFLAGS="$ac_save_CFLAGS"
])
AS_IF([test "x$cc_cv_func_expect" = "xyes"],
[AC_DEFINE([SUPPORT__BUILTIN_EXPECT], 1,
[Define this if the compiler supports __builtin_expect() function])
$1],
[$2])
])
AC_DEFUN([CC_ATTRIBUTE_ALIGNED], [
AC_REQUIRE([CC_CHECK_WERROR])
AC_CACHE_CHECK([highest __attribute__ ((aligned ())) supported],
[cc_cv_attribute_aligned],
[ac_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $cc_cv_werror"
for cc_attribute_align_try in 64 32 16 8 4 2; do
AC_COMPILE_IFELSE([
int main() {
static char c __attribute__ ((aligned($cc_attribute_align_try))) = 0;
return c;
}], [cc_cv_attribute_aligned=$cc_attribute_align_try; break])
done
CFLAGS="$ac_save_CFLAGS"
])
if test "x$cc_cv_attribute_aligned" != "x"; then
AC_DEFINE_UNQUOTED([ATTRIBUTE_ALIGNED_MAX], [$cc_cv_attribute_aligned],
[Define the highest alignment supported])
fi
])

24
src/nss-myhostname/m4/zp_lynx_doc.m4 Normal file
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@ -0,0 +1,24 @@
dnl Macro for enabling LYNX-based documentation generation
AC_DEFUN([ZP_LYNX_DOC], [
AC_ARG_ENABLE(lynx,
AS_HELP_STRING([--disable-lynx],
[Turn off lynx usage for documentation generation]),,
[enable_lynx=yes])
case "${enable_lynx}" in
yes)
AC_CHECK_PROG(have_lynx, lynx, yes, no)
if test x$have_lynx = xno ; then
AC_MSG_WARN([*** lynx not found, plain text README will not be built ***])
fi
;;
no)
have_lynx=no ;;
*)
AC_MSG_ERROR(bad value ${enableval} for --disable-lynx) ;;
esac
AM_CONDITIONAL([USE_LYNX], [test "x$have_lynx" = xyes])
])

209
src/nss-myhostname/netlink.c Normal file
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@ -0,0 +1,209 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of nss-myhostname.
Copyright 2008-2011 Lennart Poettering
nss-myhostname is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation; either version 2.1 of
the License, or (at your option) any later version.
nss-myhostname is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with nss-myhostname; If not, see
<http://www.gnu.org/licenses/>.
***/
#include <sys/socket.h>
#include <sys/un.h>
#include <asm/types.h>
#include <inttypes.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <inttypes.h>
#include <stdlib.h>
#include "ifconf.h"
int ifconf_acquire_addresses(struct address **_list, unsigned *_n_list) {
struct {
struct nlmsghdr hdr;
struct rtgenmsg gen;
} req;
struct rtgenmsg *gen;
int fd, r, on = 1;
uint32_t seq = 4711;
struct address *list = NULL;
unsigned n_list = 0;
fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
if (fd < 0)
return -errno;
if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {
r = -errno;
goto finish;
}
memset(&req, 0, sizeof(req));
req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
req.hdr.nlmsg_type = RTM_GETADDR;
req.hdr.nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP|NLM_F_ACK;
req.hdr.nlmsg_seq = seq;
req.hdr.nlmsg_pid = 0;
gen = NLMSG_DATA(&req.hdr);
gen->rtgen_family = AF_UNSPEC;
if (send(fd, &req, req.hdr.nlmsg_len, 0) < 0) {
r = -errno;
goto finish;
}
for (;;) {
ssize_t bytes;
struct msghdr msg;
struct cmsghdr *cmsg;
struct ucred *ucred;
struct iovec iov;
struct nlmsghdr *p;
uint8_t cred_buffer[CMSG_SPACE(sizeof(struct ucred))];
struct {
struct nlmsghdr hdr;
struct ifaddrmsg ifaddrmsg;
uint8_t payload[16*1024];
} resp;
memset(&iov, 0, sizeof(iov));
iov.iov_base = &resp;
iov.iov_len = sizeof(resp);
memset(&msg, 0, sizeof(msg));
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = cred_buffer;
msg.msg_controllen = sizeof(cred_buffer);
msg.msg_flags = 0;
bytes = recvmsg(fd, &msg, 0);
if (bytes < 0) {
r = -errno;
goto finish;
}
cmsg = CMSG_FIRSTHDR(&msg);
if (!cmsg || cmsg->cmsg_type != SCM_CREDENTIALS) {
r = -EIO;
goto finish;
}
ucred = (struct ucred*) CMSG_DATA(cmsg);
if (ucred->uid != 0 || ucred->pid != 0)
continue;
for (p = &resp.hdr; bytes > 0; p = NLMSG_NEXT(p, bytes)) {
struct ifaddrmsg *ifaddrmsg;
struct rtattr *a;
size_t l;
void *local = NULL, *address = NULL;
if (!NLMSG_OK(p, (size_t) bytes)) {
r = -EIO;
goto finish;
}
if (p->nlmsg_seq != seq)
continue;
if (p->nlmsg_type == NLMSG_DONE) {
r = 0;
goto finish;
}
if (p->nlmsg_type == NLMSG_ERROR) {
struct nlmsgerr *nlmsgerr;
nlmsgerr = NLMSG_DATA(p);
r = -nlmsgerr->error;
goto finish;
}
if (p->nlmsg_type != RTM_NEWADDR)
continue;
ifaddrmsg = NLMSG_DATA(p);
if (ifaddrmsg->ifa_family != AF_INET &&
ifaddrmsg->ifa_family != AF_INET6)
continue;
if (ifaddrmsg->ifa_scope == RT_SCOPE_HOST ||
ifaddrmsg->ifa_scope == RT_SCOPE_NOWHERE)
continue;
if (ifaddrmsg->ifa_flags & IFA_F_DEPRECATED)
continue;
l = NLMSG_PAYLOAD(p, sizeof(struct ifaddrmsg));
a = IFA_RTA(ifaddrmsg);
while (RTA_OK(a, l)) {
if (a->rta_type == IFA_ADDRESS)
address = RTA_DATA(a);
else if (a->rta_type == IFA_LOCAL)
local = RTA_DATA(a);
a = RTA_NEXT(a, l);
}
if (local)
address = local;
if (!address)
continue;
list = realloc(list, (n_list+1) * sizeof(struct address));
if (!list) {
r = -ENOMEM;
goto finish;
}
list[n_list].family = ifaddrmsg->ifa_family;
list[n_list].scope = ifaddrmsg->ifa_scope;
memcpy(list[n_list].address, address, ifaddrmsg->ifa_family == AF_INET ? 4 : 16);
list[n_list].ifindex = ifaddrmsg->ifa_index;
n_list++;
}
}
finish:
close(fd);
if (r < 0)
free(list);
else {
qsort(list, n_list, sizeof(struct address), address_compare);
*_list = list;
*_n_list = n_list;
}
return r;
}

451
src/nss-myhostname/nss-myhostname.c Normal file
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@ -0,0 +1,451 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of nss-myhostname.
Copyright 2008-2011 Lennart Poettering
nss-myhostname is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation; either version 2.1 of
the License, or (at your option) any later version.
nss-myhostname is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with nss-myhostname; If not, see
<http://www.gnu.org/licenses/>.
***/
#include <limits.h>
#include <nss.h>
#include <sys/types.h>
#include <netdb.h>
#include <errno.h>
#include <string.h>
#include <assert.h>
#include <unistd.h>
#include <net/if.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include "ifconf.h"
/* We use 127.0.0.2 as IPv4 address. This has the advantage over
* 127.0.0.1 that it can be translated back to the local hostname. For
* IPv6 we use ::1 which unfortunately will not translate back to the
* hostname but instead something like "localhost6" or so. */
#define LOCALADDRESS_IPV4 (htonl(0x7F000002))
#define LOCALADDRESS_IPV6 &in6addr_loopback
#define LOOPBACK_INTERFACE "lo"
#define ALIGN(a) (((a+sizeof(void*)-1)/sizeof(void*))*sizeof(void*))
enum nss_status _nss_myhostname_gethostbyname4_r(
const char *name,
struct gaih_addrtuple **pat,
char *buffer, size_t buflen,
int *errnop, int *h_errnop,
int32_t *ttlp) _public_;
enum nss_status _nss_myhostname_gethostbyname3_r(
const char *name,
int af,
struct hostent *host,
char *buffer, size_t buflen,
int *errnop, int *h_errnop,
int32_t *ttlp,
char **canonp) _public_;
enum nss_status _nss_myhostname_gethostbyname2_r(
const char *name,
int af,
struct hostent *host,
char *buffer, size_t buflen,
int *errnop, int *h_errnop) _public_;
enum nss_status _nss_myhostname_gethostbyname_r(
const char *name,
struct hostent *host,
char *buffer, size_t buflen,
int *errnop, int *h_errnop) _public_;
enum nss_status _nss_myhostname_gethostbyaddr2_r(
const void* addr, socklen_t len,
int af,
struct hostent *host,
char *buffer, size_t buflen,
int *errnop, int *h_errnop,
int32_t *ttlp) _public_;
enum nss_status _nss_myhostname_gethostbyaddr_r(
const void* addr, socklen_t len,
int af,
struct hostent *host,
char *buffer, size_t buflen,
int *errnop, int *h_errnop) _public_;
enum nss_status _nss_myhostname_gethostbyname4_r(
const char *name,
struct gaih_addrtuple **pat,
char *buffer, size_t buflen,
int *errnop, int *h_errnop,
int32_t *ttlp) {
unsigned lo_ifi;
char hn[HOST_NAME_MAX+1];
size_t l, idx, ms;
char *r_name;
struct gaih_addrtuple *r_tuple, *r_tuple_prev = NULL;
struct address *addresses = NULL, *a;
unsigned n_addresses = 0, n;
memset(hn, 0, sizeof(hn));
if (gethostname(hn, sizeof(hn)-1) < 0) {
*errnop = errno;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
}
if (strcasecmp(name, hn) != 0) {
*errnop = ENOENT;
*h_errnop = HOST_NOT_FOUND;
return NSS_STATUS_NOTFOUND;
}
/* If this fails, n_addresses is 0. Which is fine */
ifconf_acquire_addresses(&addresses, &n_addresses);
/* If this call fails we fill in 0 as scope. Which is fine */
lo_ifi = if_nametoindex(LOOPBACK_INTERFACE);
l = strlen(hn);
ms = ALIGN(l+1)+ALIGN(sizeof(struct gaih_addrtuple))*(n_addresses > 0 ? n_addresses : 2);
if (buflen < ms) {
*errnop = ENOMEM;
*h_errnop = NO_RECOVERY;
free(addresses);
return NSS_STATUS_TRYAGAIN;
}
/* First, fill in hostname */
r_name = buffer;
memcpy(r_name, hn, l+1);
idx = ALIGN(l+1);
if (n_addresses <= 0) {
/* Second, fill in IPv6 tuple */
r_tuple = (struct gaih_addrtuple*) (buffer + idx);
r_tuple->next = r_tuple_prev;
r_tuple->name = r_name;
r_tuple->family = AF_INET6;
memcpy(r_tuple->addr, LOCALADDRESS_IPV6, 16);
r_tuple->scopeid = (uint32_t) lo_ifi;
idx += ALIGN(sizeof(struct gaih_addrtuple));
r_tuple_prev = r_tuple;
/* Third, fill in IPv4 tuple */
r_tuple = (struct gaih_addrtuple*) (buffer + idx);
r_tuple->next = r_tuple_prev;
r_tuple->name = r_name;
r_tuple->family = AF_INET;
*(uint32_t*) r_tuple->addr = LOCALADDRESS_IPV4;
r_tuple->scopeid = (uint32_t) lo_ifi;
idx += ALIGN(sizeof(struct gaih_addrtuple));
r_tuple_prev = r_tuple;
}
/* Fourth, fill actual addresses in, but in backwards order */
for (a = addresses + n_addresses - 1, n = 0; n < n_addresses; n++, a--) {
r_tuple = (struct gaih_addrtuple*) (buffer + idx);
r_tuple->next = r_tuple_prev;
r_tuple->name = r_name;
r_tuple->family = a->family;
r_tuple->scopeid = a->ifindex;
memcpy(r_tuple->addr, a->address, 16);
idx += ALIGN(sizeof(struct gaih_addrtuple));
r_tuple_prev = r_tuple;
}
/* Verify the size matches */
assert(idx == ms);
*pat = r_tuple_prev;
if (ttlp)
*ttlp = 0;
free(addresses);
return NSS_STATUS_SUCCESS;
}
static enum nss_status fill_in_hostent(
const char *hn,
int af,
struct hostent *result,
char *buffer, size_t buflen,
int *errnop, int *h_errnop,
int32_t *ttlp,
char **canonp) {
size_t l, idx, ms;
char *r_addr, *r_name, *r_aliases, *r_addr_list;
size_t alen;
struct address *addresses = NULL, *a;
unsigned n_addresses = 0, n, c;
alen = PROTO_ADDRESS_SIZE(af);
ifconf_acquire_addresses(&addresses, &n_addresses);
for (a = addresses, n = 0, c = 0; n < n_addresses; a++, n++)
if (af == a->family)
c++;
l = strlen(hn);
ms = ALIGN(l+1)+
sizeof(char*)+
(c > 0 ? c : 1)*ALIGN(alen)+
(c > 0 ? c+1 : 2)*sizeof(char*);
if (buflen < ms) {
*errnop = ENOMEM;
*h_errnop = NO_RECOVERY;
free(addresses);
return NSS_STATUS_TRYAGAIN;
}
/* First, fill in hostname */
r_name = buffer;
memcpy(r_name, hn, l+1);
idx = ALIGN(l+1);
/* Second, create (empty) aliases array */
r_aliases = buffer + idx;
*(char**) r_aliases = NULL;
idx += sizeof(char*);
/* Third, add addresses */
r_addr = buffer + idx;
if (c > 0) {
unsigned i = 0;
for (a = addresses, n = 0; n < n_addresses; a++, n++) {
if (af != a->family)
continue;
memcpy(r_addr + i*ALIGN(alen), a->address, alen);
i++;
}
assert(i == c);
idx += c*ALIGN(alen);
} else {
if (af == AF_INET)
*(uint32_t*) r_addr = LOCALADDRESS_IPV4;
else
memcpy(r_addr, LOCALADDRESS_IPV6, 16);
idx += ALIGN(alen);
}
/* Fourth, add address pointer array */
r_addr_list = buffer + idx;
if (c > 0) {
unsigned i = 0;
for (a = addresses, n = 0; n < n_addresses; a++, n++) {
if (af != a->family)
continue;
((char**) r_addr_list)[i] = (r_addr + i*ALIGN(alen));
i++;
}
assert(i == c);
((char**) r_addr_list)[c] = NULL;
idx += (c+1)*sizeof(char*);
} else {
((char**) r_addr_list)[0] = r_addr;
((char**) r_addr_list)[1] = NULL;
idx += 2*sizeof(char*);
}
/* Verify the size matches */
assert(idx == ms);
result->h_name = r_name;
result->h_aliases = (char**) r_aliases;
result->h_addrtype = af;
result->h_length = alen;
result->h_addr_list = (char**) r_addr_list;
if (ttlp)
*ttlp = 0;
if (canonp)
*canonp = r_name;
free(addresses);
return NSS_STATUS_SUCCESS;
}
enum nss_status _nss_myhostname_gethostbyname3_r(
const char *name,
int af,
struct hostent *host,
char *buffer, size_t buflen,
int *errnop, int *h_errnop,
int32_t *ttlp,
char **canonp) {
char hn[HOST_NAME_MAX+1];
if (af == AF_UNSPEC)
af = AF_INET;
if (af != AF_INET && af != AF_INET6) {
*errnop = EAFNOSUPPORT;
*h_errnop = NO_DATA;
return NSS_STATUS_UNAVAIL;
}
memset(hn, 0, sizeof(hn));
if (gethostname(hn, sizeof(hn)-1) < 0) {
*errnop = errno;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
}
if (strcasecmp(name, hn) != 0) {
*errnop = ENOENT;
*h_errnop = HOST_NOT_FOUND;
return NSS_STATUS_NOTFOUND;
}
return fill_in_hostent(hn, af, host, buffer, buflen, errnop, h_errnop, ttlp, canonp);
}
enum nss_status _nss_myhostname_gethostbyname2_r(
const char *name,
int af,
struct hostent *host,
char *buffer, size_t buflen,
int *errnop, int *h_errnop) {
return _nss_myhostname_gethostbyname3_r(
name,
af,
host,
buffer, buflen,
errnop, h_errnop,
NULL,
NULL);
}
enum nss_status _nss_myhostname_gethostbyname_r(
const char *name,
struct hostent *host,
char *buffer, size_t buflen,
int *errnop, int *h_errnop) {
return _nss_myhostname_gethostbyname3_r(
name,
AF_UNSPEC,
host,
buffer, buflen,
errnop, h_errnop,
NULL,
NULL);
}
enum nss_status _nss_myhostname_gethostbyaddr2_r(
const void* addr, socklen_t len,
int af,
struct hostent *host,
char *buffer, size_t buflen,
int *errnop, int *h_errnop,
int32_t *ttlp) {
char hn[HOST_NAME_MAX+1];
struct address *addresses = NULL, *a;
unsigned n_addresses = 0, n;
if (len != PROTO_ADDRESS_SIZE(af)) {
*errnop = EINVAL;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
}
if (af == AF_INET) {
if ((*(uint32_t*) addr) == LOCALADDRESS_IPV4)
goto found;
} else if (af == AF_INET6) {
if (memcmp(addr, LOCALADDRESS_IPV6, 16) == 0)
goto found;
} else {
*errnop = EAFNOSUPPORT;
*h_errnop = NO_DATA;
return NSS_STATUS_UNAVAIL;
}
ifconf_acquire_addresses(&addresses, &n_addresses);
for (a = addresses, n = 0; n < n_addresses; n++, a++) {
if (af != a->family)
continue;
if (memcmp(addr, a->address, PROTO_ADDRESS_SIZE(af)) == 0)
goto found;
}
*errnop = ENOENT;
*h_errnop = HOST_NOT_FOUND;
free(addresses);
return NSS_STATUS_NOTFOUND;
found:
free(addresses);
memset(hn, 0, sizeof(hn));
if (gethostname(hn, sizeof(hn)-1) < 0) {
*errnop = errno;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
}
return fill_in_hostent(hn, af, host, buffer, buflen, errnop, h_errnop, ttlp, NULL);
}
enum nss_status _nss_myhostname_gethostbyaddr_r(
const void* addr, socklen_t len,
int af,
struct hostent *host,
char *buffer, size_t buflen,
int *errnop, int *h_errnop) {
return _nss_myhostname_gethostbyaddr2_r(
addr, len,
af,
host,
buffer, buflen,
errnop, h_errnop,
NULL);
}