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| -rw-r--r-- | src/nss-myhostname/.gitignore | 24 | ||||
| -rw-r--r-- | src/nss-myhostname/LICENSE | 510 | ||||
| -rw-r--r-- | src/nss-myhostname/Makefile.am | 66 | ||||
| -rwxr-xr-x | src/nss-myhostname/bootstrap.sh | 66 | ||||
| -rw-r--r-- | src/nss-myhostname/configure.ac | 84 | ||||
| -rw-r--r-- | src/nss-myhostname/doc/.gitignore | 2 | ||||
| -rw-r--r-- | src/nss-myhostname/doc/Makefile.am | 38 | ||||
| -rw-r--r-- | src/nss-myhostname/doc/README.html.in | 166 | ||||
| -rw-r--r-- | src/nss-myhostname/doc/style.css | 25 | ||||
| -rw-r--r-- | src/nss-myhostname/ifconf.h | 74 | ||||
| -rw-r--r-- | src/nss-myhostname/legacy.c | 92 | ||||
| -rw-r--r-- | src/nss-myhostname/m4/attributes.m4 | 258 | ||||
| -rw-r--r-- | src/nss-myhostname/m4/zp_lynx_doc.m4 | 24 | ||||
| -rw-r--r-- | src/nss-myhostname/netlink.c | 209 | ||||
| -rw-r--r-- | src/nss-myhostname/nss-myhostname.c | 451 |
15 files changed, 2089 insertions, 0 deletions
diff --git a/src/nss-myhostname/.gitignore b/src/nss-myhostname/.gitignore new file mode 100644 index 0000000000..b35d629834 --- /dev/null +++ b/src/nss-myhostname/.gitignore @@ -0,0 +1,24 @@ +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 diff --git a/src/nss-myhostname/LICENSE b/src/nss-myhostname/LICENSE new file mode 100644 index 0000000000..2d2d780e60 --- /dev/null +++ b/src/nss-myhostname/LICENSE @@ -0,0 +1,510 @@ + + 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 + of this license document, but changing it is not allowed. + +[This is the first released version of the Lesser GPL. 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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 diff --git a/src/nss-myhostname/bootstrap.sh b/src/nss-myhostname/bootstrap.sh new file mode 100755 index 0000000000..d224f31fb5 --- /dev/null +++ b/src/nss-myhostname/bootstrap.sh @@ -0,0 +1,66 @@ +#!/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 diff --git a/src/nss-myhostname/configure.ac b/src/nss-myhostname/configure.ac new file mode 100644 index 0000000000..30ebc44a80 --- /dev/null +++ b/src/nss-myhostname/configure.ac @@ -0,0 +1,84 @@ +# -*- 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 diff --git a/src/nss-myhostname/doc/.gitignore b/src/nss-myhostname/doc/.gitignore new file mode 100644 index 0000000000..bc63974b07 --- /dev/null +++ b/src/nss-myhostname/doc/.gitignore @@ -0,0 +1,2 @@ +README +README.html diff --git a/src/nss-myhostname/doc/Makefile.am b/src/nss-myhostname/doc/Makefile.am new file mode 100644 index 0000000000..4f773ac2c6 --- /dev/null +++ b/src/nss-myhostname/doc/Makefile.am @@ -0,0 +1,38 @@ +# 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 diff --git a/src/nss-myhostname/doc/README.html.in b/src/nss-myhostname/doc/README.html.in new file mode 100644 index 0000000000..f78618298c --- /dev/null +++ b/src/nss-myhostname/doc/README.html.in @@ -0,0 +1,166 @@ +<?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 <@PACKAGE_BUGREPORT@></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 <@PACKAGE_BUGREPORT@>, May 2011</address> + +</body> +</html> diff --git a/src/nss-myhostname/doc/style.css b/src/nss-myhostname/doc/style.css new file mode 100644 index 0000000000..5cc21fd510 --- /dev/null +++ b/src/nss-myhostname/doc/style.css @@ -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%; } diff --git a/src/nss-myhostname/ifconf.h b/src/nss-myhostname/ifconf.h new file mode 100644 index 0000000000..6b2c83f91e --- /dev/null +++ b/src/nss-myhostname/ifconf.h @@ -0,0 +1,74 @@ +/*-*- 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 diff --git a/src/nss-myhostname/legacy.c b/src/nss-myhostname/legacy.c new file mode 100644 index 0000000000..9c0bcadb65 --- /dev/null +++ b/src/nss-myhostname/legacy.c @@ -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; +} diff --git a/src/nss-myhostname/m4/attributes.m4 b/src/nss-myhostname/m4/attributes.m4 new file mode 100644 index 0000000000..9c4a0c89a5 --- /dev/null +++ b/src/nss-myhostname/m4/attributes.m4 @@ -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 +]) diff --git a/src/nss-myhostname/m4/zp_lynx_doc.m4 b/src/nss-myhostname/m4/zp_lynx_doc.m4 new file mode 100644 index 0000000000..955a6ca0af --- /dev/null +++ b/src/nss-myhostname/m4/zp_lynx_doc.m4 @@ -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]) +]) diff --git a/src/nss-myhostname/netlink.c b/src/nss-myhostname/netlink.c new file mode 100644 index 0000000000..29f38e3a00 --- /dev/null +++ b/src/nss-myhostname/netlink.c @@ -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; +} diff --git a/src/nss-myhostname/nss-myhostname.c b/src/nss-myhostname/nss-myhostname.c new file mode 100644 index 0000000000..83180ad805 --- /dev/null +++ b/src/nss-myhostname/nss-myhostname.c @@ -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); +} |