From 3e05cdd09405cc6133ebf38ea9ee9afc50fb280f Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Mon, 4 Aug 2003 22:45:25 +0000 Subject: Initial checkin git-svn-id: file:///home/lennart/svn/public/ifmetric/trunk@3 b1ab5a0b-19c4-0310-9d9a-ef184d715f50 --- LICENSE | 340 ++++++++++++++++++++++++++++++++++++++++++++++++++ Makefile.am | 35 ++++++ bootstrap.sh | 39 ++++++ configure.ac | 86 +++++++++++++ doc/Makefile.am | 36 ++++++ doc/README.html.in | 133 ++++++++++++++++++++ doc/style.css | 12 ++ man/Makefile.am | 30 +++++ man/ifmetric.8.xml.in | 73 +++++++++++ src/Makefile.am | 23 ++++ src/getifn.c | 77 ++++++++++++ src/getifn.h | 7 ++ src/ifmetric.c | 204 ++++++++++++++++++++++++++++++ src/nlrequest.c | 139 +++++++++++++++++++++ src/nlrequest.h | 20 +++ 15 files changed, 1254 insertions(+) create mode 100644 LICENSE create mode 100644 Makefile.am create mode 100755 bootstrap.sh create mode 100644 configure.ac create mode 100644 doc/Makefile.am create mode 100644 doc/README.html.in create mode 100644 doc/style.css create mode 100644 man/Makefile.am create mode 100644 man/ifmetric.8.xml.in create mode 100644 src/Makefile.am create mode 100644 src/getifn.c create mode 100644 src/getifn.h create mode 100644 src/ifmetric.c create mode 100644 src/nlrequest.c create mode 100644 src/nlrequest.h diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..d60c31a --- /dev/null +++ b/LICENSE @@ -0,0 +1,340 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Library General +Public License instead of this License. diff --git a/Makefile.am b/Makefile.am new file mode 100644 index 0000000..4d0daf7 --- /dev/null +++ b/Makefile.am @@ -0,0 +1,35 @@ +# $Id$ + +# This file is part of ifmetric. +# +# ifmetric is free software; you can redistribute it and/or modify it +# under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# ifmetric 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 +# General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with ifmetric; if not, write to the Free Software Foundation, +# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + +EXTRA_DIST=bootstrap.sh README LICENSE +SUBDIRS=src man doc + +MAINTAINERCLEANFILES = README +noinst_DATA = README + +README: + rm -f README + $(MAKE) -C doc README + ln -s doc/README README + +homepage: + test -d $$HOME/homepage/lennart + mkdir -p $$HOME/homepage/lennart/projects/ifmetric + cp *.tar.gz $$HOME/homepage/lennart/projects/ifmetric + cp doc/README.html doc/style.css doc/NEWS $$HOME/homepage/lennart/projects/ifmetric + cp $$HOME/homepage/lennart/projects/ifmetric/README.html $$HOME/homepage/lennart/projects/ifmetric/index.html diff --git a/bootstrap.sh b/bootstrap.sh new file mode 100755 index 0000000..3ccd6e9 --- /dev/null +++ b/bootstrap.sh @@ -0,0 +1,39 @@ +#!/bin/sh +# $Id$ + +# This file is part of ifmetric. +# +# ifmetric is free software; you can redistribute it and/or modify it +# under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# ifmetric 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 +# General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with ifmetric; if not, write to the Free Software Foundation, +# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + +if [ "x$1" = "xam" ] ; then + set -ex + automake -a -c + ./config.status +else + set -ex + + make maintainer-clean || true + + rm -rf autom4te.cache + rm -f config.cache + + aclocal + autoheader + automake -a -c + autoconf -Wall + + ./configure "$@" +fi + diff --git a/configure.ac b/configure.ac new file mode 100644 index 0000000..913787a --- /dev/null +++ b/configure.ac @@ -0,0 +1,86 @@ +# -*- Autoconf -*- +# Process this file with autoconf to produce a configure script. + +# $Id$ + +# This file is part of ifmetric. +# +# ifmetric is free software; you can redistribute it and/or modify it +# under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# ifmetric 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 +# General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with ifmetric; if not, write to the Free Software Foundation, +# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + +AC_PREREQ(2.57) +AC_INIT([ifmetric], [0.1], [mzvszrgevp@itaparica.org]) +AC_CONFIG_SRCDIR([src/ifmetric.c]) +AC_CONFIG_HEADERS([config.h]) +AM_INIT_AUTOMAKE([foreign -Wall]) +AM_MAINTAINER_MODE + +# Checks for programs. +AC_PROG_CC +AC_CHECK_FUNCS([memset socket strerror strrchr]) +AC_CHECK_HEADERS([stdlib.h string.h sys/socket.h unistd.h]) +AC_FUNC_MALLOC +AC_FUNC_REALLOC +AC_HEADER_STDC +AC_PROG_LN_S +AC_TYPE_PID_T + +AC_CHECK_HEADER([linux/version.h],, [AC_MSG_ERROR([*** Sorry, you have to install the kernel header files ***])]) + +# If using GCC specifiy some additional parameters +if test "x$GCC" = "xyes" ; then + CFLAGS="$CFLAGS -pipe -Wall" +fi + +# LYNX documentation generation +AC_ARG_ENABLE(lynx, + AC_HELP_STRING([--disable-lynx], [Turn off lynx usage for documentation generation]), +[case "${enableval}" in + yes) lynx=yes ;; + no) lynx=no ;; + *) AC_MSG_ERROR(bad value ${enableval} for --disable-lynx) ;; +esac],[lynx=yes]) + +if test x$lynx = xyes ; then + AC_CHECK_PROG(have_lynx, lynx, yes, no) + + if test x$have_lynx = xno ; then + AC_MSG_ERROR([*** Sorry, you have to install lynx or use --disable-lynx ***]) + fi +fi + +AM_CONDITIONAL([USE_LYNX], [test "x$lynx" = xyes]) + +# XMLTOMAN manpage generation +AC_ARG_ENABLE(xmltoman, + AC_HELP_STRING([--disable-xmltoman], [Disable rebuilding of man pages with xmltoman]), +[case "${enableval}" in + yes) xmltoman=yes ;; + no) xmltoman=no ;; + *) AC_MSG_ERROR([bad value ${enableval} for --disable-xmltoman]) ;; +esac],[xmltoman=yes]) + +if test x$xmltoman = xyes ; then + AC_CHECK_PROG(have_xmltoman, xmltoman, yes, no) + + if test x$have_xmltoman = xno ; then + AC_MSG_WARN([*** Not rebuilding man pages as xmltoman is not found ***]) + xmltoman=no + fi +fi + +AM_CONDITIONAL([USE_XMLTOMAN], [test "x$xmltoman" = xyes]) + +AC_CONFIG_FILES([src/Makefile Makefile man/Makefile doc/Makefile doc/README.html]) +AC_OUTPUT diff --git a/doc/Makefile.am b/doc/Makefile.am new file mode 100644 index 0000000..7b7836e --- /dev/null +++ b/doc/Makefile.am @@ -0,0 +1,36 @@ +# $Id$ + +# This file is part of ifmetric. +# +# ifmetric is free software; you can redistribute it and/or modify it +# under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# ifmetric 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 +# General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with ifmetric; if not, write to the Free Software Foundation, +# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + +noinst_DATA = README.html README +EXTRA_DIST = $(noinst_DATA) style.css README.html.in + +MAINTAINERCLEANFILES = README README.html +CLEANFILES = + +if USE_LYNX +README: README.html + lynx --dump $^ | sed 's,file://localhost/.*/doc/README.html,README,' > $@ + +CLEANFILES += README +endif + +tidy: README.html + tidy -e < README.html + +.PHONY: tidy + diff --git a/doc/README.html.in b/doc/README.html.in new file mode 100644 index 0000000..46f4a23 --- /dev/null +++ b/doc/README.html.in @@ -0,0 +1,133 @@ + + + + + +ifmetric @PACKAGE_VERSION@ + + + + +

ifmetric @PACKAGE_VERSION@

+ +

Copyright 2003 Lennart Poettering <mzvszrgevp [at] itaparica.org>

+ + + +

License

+ +

This program is free software; you can redistribute it and/or +modify it under the terms of the GNU General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version.

+ +

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 +General Public License for more details.

+ +

You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

+ +

News

+ +
Mon Aug 4 2003:

Version +0.1 released

+ +

Overview

+ +

ifmetric is a Linux tool for setting the metrics of all +IPv4 routes attached to a given network interface at once. This +may be used to change the priority of routing IPv4 traffic over +the interface. Lower metrics correlate with higher +priorities.

+ +

Status

+ +

Version @PACKAGE_VERSION@ is stable and feature complete.

+ +

Documentation

+ +

ifmetric's purpose

+ +

Sometimes two network interfaces of different speeds with equal +routes are available at the same time. (e.g. a laptop with both a +wireless and a copper LAN card) The one with the greater througput +should be preferred over the other. To achieve this, you may use the +route's metric field. Routes with lower metrics are preferred over +those with higher. Unfortunately many network configurators (like DHCP +clients) do not support to set the metric for a +route. ifmetric may be used to manipulate the metrics of +routes a posteriori. The default metric for a route in the Linux +kernel is 0, meaning the highest priority.

+ +

ifmetric makes use of the NETLINK interface of the Linux +kernel for manipulating the routes. Thus, ifmetric is +compatible with complex routes created with iproute2.

+ +

ifmetric doesn't modify the routes atomically. The is due +to the NETLINK API. However, this should not hurt since +ifmetric makes sure that not routes are ever lost while +modifying them.

+ +

Usage

+ +

To give all other interfaces a higher priority than wlan0 simply run:

+ +
ifmetric wlan0 1
+ +

To reset the metrics of the routes attached to wlan0 simply run: + +

ifmetric wlan0 0
+ +

Requirements

+ +

A newer Linux Kernel supporting the NETLINK API. (I think 2.2 is +good enough).

+ +

ifmetric was developed and tested on Debian GNU/Linux +"testing" from August 2003, it should work on most other Linux +distributions since it uses GNU autoconf for +source code configuration.

+ +

Installation

+ +

As this package is made with the GNU autotools you should run +./configure inside the distribution directory for configuring +the source tree. After that you should run make for +compilation and make install (as root) for installation of +ifmetric.

+ +

The Linux kernel headers have to be available during compilation.

+ +

Acknowledgements

+ +

For the developers of iproute2 and zebra, since I looked +on their source codes for learning how to use NETLINK.

+ +

Download

+ +

The newest release is always available from http://www.stud.uni-hamburg.de/~lennart/projects/ifmetric/

+ +

The current release is @PACKAGE_VERSION@

+ +
+ +
Lennart Poettering <mzvszrgevp [at] itaparica.org>, July 2003
+ +
$Id$
+ + + diff --git a/doc/style.css b/doc/style.css new file mode 100644 index 0000000..0a40aef --- /dev/null +++ b/doc/style.css @@ -0,0 +1,12 @@ +/* $Id$ */ +body { color: black; background-color: white; margin: 0.5cm; } +a:link, a:visited { color: #900000; } +p { margin-left: 0.5cm; margin-right: 0.5cm; } +div.news-date { margin-left: 0.5cm; font-size: 80%; color: #4f0000; } +p.news-text { margin-left: 1cm; } +ul { margin-left: .5cm; } +ol { margin-left: .5cm; } +h1 { color: #00009F; } +h2 { color: #00009F; } +h3 { color: #00004F; margin-left: 0.5cm; } +pre { margin-left: .5cm; background-color: #f0f0f0; padding: 0.4cm;} diff --git a/man/Makefile.am b/man/Makefile.am new file mode 100644 index 0000000..26be22c --- /dev/null +++ b/man/Makefile.am @@ -0,0 +1,30 @@ +# $Id$ + +# This file is part of ifmetric. +# +# ifmetric is free software; you can redistribute it and/or modify it +# under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# ifmetric 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 +# General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with ifmetric; if not, write to the Free Software Foundation, +# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + +man_MANS = ifmetric.8 + +EXTRA_DIST = $(man_MANS) ifmetric.8.xml.in + +if USE_XMLTOMAN + +CLEANFILES = $(man_MANS) + +ifmetric.8: ifmetric.8.xml.in Makefile + sed -e 's,@sysconfdir\@,$(sysconfdir),g' -e 's,@sbindir\@,$(sbindir),g' -e 's,@PACKAGE_BUGREPORT\@,$(PACKAGE_BUGREPORT),g' $< | xmltoman - > $@ + +endif diff --git a/man/ifmetric.8.xml.in b/man/ifmetric.8.xml.in new file mode 100644 index 0000000..050cb4d --- /dev/null +++ b/man/ifmetric.8.xml.in @@ -0,0 +1,73 @@ + + + + + + + + + + + ifmetric INTERFACE [METRIC] + + +

ifmetric is a Linux tool for setting the metrics of all + IPv4 routes attached to a given network interface at once. This + may be used to change the priority of routing IPv4 traffic over + the interface. Lower metrics correlate with higher + priorities.

+ +

ifmetric uses the Linux NETLINK interface to manipulate the + routes. Because of that it is compatible with routes created with + the new iproute2 utility.

+ + + + +

You should specify the interface name as first parameter. The + second parameter should be the new metric. If ommited the metric + 0 (highest) is used.

+ + + +
+

0 Success

+

1 Failure

+
+ +
+

ifmetric was written by Lennart Poettering + <@PACKAGE_BUGREPORT@>. ifmetric is available + at +

+
+ +
+

+ , iproute2 +

+
+ +
+

This man page was written using by Oliver Kurth.

+
+ + diff --git a/src/Makefile.am b/src/Makefile.am new file mode 100644 index 0000000..ff501ea --- /dev/null +++ b/src/Makefile.am @@ -0,0 +1,23 @@ +# $Id$ + +# This file is part of ifmetric. +# +# ifmetric is free software; you can redistribute it and/or modify it +# under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# ifmetric 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 +# General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with ifmetric; if not, write to the Free Software Foundation, +# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + + +sbin_PROGRAMS = ifmetric + +ifmetric_SOURCES = ifmetric.c getifn.h getifn.c nlrequest.h nlrequest.c + diff --git a/src/getifn.c b/src/getifn.c new file mode 100644 index 0000000..74dfc72 --- /dev/null +++ b/src/getifn.c @@ -0,0 +1,77 @@ +#include +#include + +#include "getifn.h" +#include "nlrequest.h" + +struct getifn_info { + char ifname[IFNAMSIZ+1]; + int idx; +}; + +int getifn_callback(struct nlmsghdr *n, void *u) { + struct rtattr *a = NULL; + int l; + struct getifn_info *gi = (struct getifn_info*) u; + struct ifinfomsg *i; + + if (n->nlmsg_type != RTM_NEWLINK) { + fprintf(stderr, "NETLINK: Got response for wrong request.\n"); + return -1; + } + + i = NLMSG_DATA(n); + l = NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg)); + a = IFLA_RTA(i); + + while(RTA_OK(a, l)) { + + switch(a->rta_type) { + case IFLA_IFNAME: + if (strncmp(RTA_DATA(a), gi->ifname, IFNAMSIZ) == 0) { + gi->idx = i->ifi_index; + return 0; + } + } + a = RTA_NEXT(a, l); + } + + return 0; +} + +int getifn(int s, char *iface) { + struct getifn_info gi; + + struct { + struct nlmsghdr n; + struct ifinfomsg i; + char a[1024]; + } req; + + memset(&req, 0, sizeof(req)); + req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)); + req.n.nlmsg_flags = NLM_F_REQUEST|NLM_F_MATCH; + req.n.nlmsg_type = RTM_GETLINK; + + req.i.ifi_family = AF_UNSPEC; + req.i.ifi_change = -1; + + memset(&gi, 0, sizeof(gi)); + strncpy(gi.ifname, iface, IFNAMSIZ); + gi.idx = -1; + + if (addattr_l(&req.n, sizeof(req), IFLA_IFNAME, gi.ifname, IFNAMSIZ+1) < 0) { + fprintf(stderr, "Failed to add attribute to netlink message\n"); + return -1; + } + + if (netlink_request(s, (struct nlmsghdr*) &req, getifn_callback, &gi) < 0) + return -1; + + if (gi.idx < 0) { + fprintf(stderr, "Interface '%s' not existent.\n", iface); + return -1; + } + + return gi.idx; +} diff --git a/src/getifn.h b/src/getifn.h new file mode 100644 index 0000000..3c4cff8 --- /dev/null +++ b/src/getifn.h @@ -0,0 +1,7 @@ +#ifndef foogetifnhfoo +#define foogetifnhfoo + +/* Return the kernel index for the given interface. */ +int getifn(int s, char *iface); + +#endif diff --git a/src/ifmetric.c b/src/ifmetric.c new file mode 100644 index 0000000..a232061 --- /dev/null +++ b/src/ifmetric.c @@ -0,0 +1,204 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "nlrequest.h" +#include "getifn.h" + +#define MAX_ROUTES 64 + +struct nlmsghdr* routes[MAX_ROUTES]; +int n_routes = 0; + +int enumerate_callback(struct nlmsghdr *n, void *u) { + struct rtmsg *r; + struct rtattr *a = NULL; + int l, *ifn = u; + + if (n->nlmsg_type != RTM_NEWROUTE) { + fprintf(stderr, "NETLINK: Got response for wrong request.\n"); + return -1; + } + + r = NLMSG_DATA(n); + l = NLMSG_PAYLOAD(n, sizeof(struct rtmsg)); + a = RTM_RTA(r); + + if (r->rtm_table != RT_TABLE_MAIN) + return 0; + + while(RTA_OK(a, l)) { + switch(a->rta_type) { + case RTA_OIF: + + if (RTA_PAYLOAD(a) != sizeof(int)) { + fprintf(stderr, "NETLINK: Recieved corrupt RTA_OIF payload.\n"); + return -1; + } + + if (*((int*) RTA_DATA(a)) == *ifn) { + + if (n_routes < MAX_ROUTES) { + struct nlmsghdr* copy; + + if (!(copy = malloc(n->nlmsg_len))) { + fprintf(stderr, "Could not allocate memory.\n"); + return -1; + } + + memcpy(copy, n, n->nlmsg_len); + routes[n_routes++] = copy; + + } else + fprintf(stderr, "Found too many routes.\n"); + + break; + } + + + } + + a = RTA_NEXT(a, l); + } + + return 0; +} + +int enumerate(int s, int ifn) { + struct { + struct nlmsghdr n; + struct rtmsg r; + char a[1024]; + } req; + + memset(&req, 0, sizeof(req)); + req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); + req.n.nlmsg_flags = NLM_F_REQUEST|NLM_F_MATCH; + req.n.nlmsg_type = RTM_GETROUTE; + + req.r.rtm_family = AF_INET; + req.r.rtm_table = RT_TABLE_MAIN; + + return netlink_request(s, (struct nlmsghdr*) &req, enumerate_callback, &ifn); +} + +struct nlmsghdr* set_route_metric(struct nlmsghdr* n, int metric) { + struct rtmsg *r; + struct rtattr *a = NULL; + int l, t; + + r = NLMSG_DATA(n); + l = NLMSG_PAYLOAD(n, sizeof(struct rtmsg)); + a = RTM_RTA(r); + + while(RTA_OK(a, l)) { + switch(a->rta_type) { + case RTA_PRIORITY: + + if (RTA_PAYLOAD(a) != sizeof(int)) { + fprintf(stderr, "NETLINK: Recieved corrupt RTA_PRIORITY payload.\n"); + return NULL; + } + + *((int*) RTA_DATA(a)) = metric; + return n; + } + + a = RTA_NEXT(a, l); + } + + if ((n = realloc(n, (t = n->nlmsg_len+1024)))) + addattr32(n, t, RTA_PRIORITY, metric); + else + fprintf(stderr, "realloc() failed.\n"); + + return n; +} + +int delete_route(int s, struct nlmsghdr* n) { + assert(s >= 0 && n); + + n->nlmsg_type = RTM_DELROUTE; + n->nlmsg_flags = NLM_F_REQUEST; + + return netlink_request(s, n, NULL, NULL); +} + +int add_route(int s, struct nlmsghdr* n) { + assert(s >= 0 && n); + + n->nlmsg_type = RTM_NEWROUTE; + n->nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE; + + return netlink_request(s, n, NULL, NULL); +} + + +int go(char *iface, int metric) { + int r = -1, j; + int s = -1, ifn; + + if ((s = netlink_open()) < 0) + return -1; + + if ((ifn = getifn(s, iface)) < 0) + goto finish; + + n_routes = 0; + if (enumerate(s, ifn) < 0) + goto finish; + + if (n_routes) { + for (j = 0; j < n_routes; j++) { + if (delete_route(s, routes[j]) >= 0) + if ((routes[j] = set_route_metric(routes[j], metric))) + add_route(s, routes[j]); + + free(routes[j]); + } + } + + r = 0; + +finish: + + if (s >= 0) + close(s); + + return r; +} + +int main(int argc, char *argv[]) { + char *iface; + int metric; + + if (argc <= 1 || (argc > 1 && (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")))) { + char *b; + + if ((b = strrchr(argv[0], '/'))) + b++; + else + b = argv[0]; + + printf("Usage: %s [metric]\n" + "\n" + "%s is a tool for setting the metrics of all IPv4 routes\n" + "attached to a given network interface at once.\n" + "\n" + " The interface\n" + " The new metric (default: 0)\n", b, b); + return 0; + } + + iface = argv[1]; + metric = argc > 2 ? atoi(argv[2]) : 0; + + return go(iface, metric) < 0 ? 1 : 0; + +} diff --git a/src/nlrequest.c b/src/nlrequest.c new file mode 100644 index 0000000..1f72357 --- /dev/null +++ b/src/nlrequest.c @@ -0,0 +1,139 @@ +#include +#include +#include +#include +#include + +#include "nlrequest.h" + +int netlink_open(void) { + struct sockaddr_nl addr; + int s; + + if ((s = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE)) < 0) { + fprintf(stderr, "socket(PF_NETLINK): %s\n", strerror(errno)); + return -1; + } + + memset(&addr, 0, sizeof(addr)); + addr.nl_family = AF_NETLINK; + addr.nl_groups = 0; + addr.nl_pid = getpid(); + + if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) { + fprintf(stderr, "bind(): %s\n", strerror(errno)); + return -1; + } + + return s; +} + + +int netlink_request(int s, struct nlmsghdr *n, int (*callback) (struct nlmsghdr *n, void *u), void *u) { + static int seq = 0; + pid_t pid = getpid(); + assert(s >= 0 && n); + + n->nlmsg_seq = seq++; + n->nlmsg_flags |= NLM_F_ACK; + + if (send(s, n, n->nlmsg_len, 0) < 0) { + fprintf(stderr, "NETLINK: send(): %s\n", strerror(errno)); + return -1; + } + + for (;;) { + int bytes; + char replybuf[1024]; + struct nlmsghdr *p = (struct nlmsghdr *) replybuf; + + if ((bytes = recv(s, &replybuf, sizeof(replybuf), 0)) < 0) { + fprintf(stderr, "recv(): %s\n", strerror(errno)); + return -1; + } + + for (; bytes > 0; p = NLMSG_NEXT(p, bytes)) { + int ret; + + if (!NLMSG_OK(p, bytes) || bytes < sizeof(struct nlmsghdr) || bytes < p->nlmsg_len) { + fprintf(stderr, "NETLINK: Packet too small or truncated!\n"); + return -1; + } + + if (p->nlmsg_type == NLMSG_DONE) + return 0; + + if (p->nlmsg_type == NLMSG_ERROR) { + struct nlmsgerr *e = (struct nlmsgerr *) NLMSG_DATA (p); + + if (e->error) { + fprintf(stderr, "NETLINK: Error: %s\n", strerror(-e->error)); + return -1; + } else + return 0; + } + + if (p->nlmsg_pid != pid) + continue; + + if (p->nlmsg_seq != n->nlmsg_seq) { + fprintf(stderr, "NETLINK: Received message with bogus sequence number!\n"); + continue; + } + + if (callback) + if ((ret = callback(p, u)) < 0) + return ret; + } + } + + return 0; +} + +/* + * Utility function comes from iproute2. + * Author: Alexey Kuznetsov, + */ + +int addattr_l(struct nlmsghdr *n, int maxlen, int type, void *data, int alen) { + int len; + struct rtattr *rta; + + len = RTA_LENGTH(alen); + + if (NLMSG_ALIGN(n->nlmsg_len) + len > maxlen) + return -1; + + rta = (struct rtattr*) (((char*)n) + NLMSG_ALIGN (n->nlmsg_len)); + rta->rta_type = type; + rta->rta_len = len; + memcpy (RTA_DATA(rta), data, alen); + n->nlmsg_len = NLMSG_ALIGN (n->nlmsg_len) + len; + + return 0; +} + +/* + * Utility function comes from iproute2. + * Author: Alexey Kuznetsov, + */ + + +int addattr32(struct nlmsghdr *n, int maxlen, int type, int data) { + int len; + struct rtattr *rta; + + len = RTA_LENGTH(4); + + if (NLMSG_ALIGN (n->nlmsg_len) + len > maxlen) + return -1; + + rta = (struct rtattr*) (((char*)n) + NLMSG_ALIGN (n->nlmsg_len)); + rta->rta_type = type; + rta->rta_len = len; + memcpy (RTA_DATA(rta), &data, 4); + n->nlmsg_len = NLMSG_ALIGN (n->nlmsg_len) + len; + + return 0; +} + diff --git a/src/nlrequest.h b/src/nlrequest.h new file mode 100644 index 0000000..efe3450 --- /dev/null +++ b/src/nlrequest.h @@ -0,0 +1,20 @@ +#ifndef foonlrequesthfoo +#define foonlrequesthfoo + +#include +#include +#include +#include +#include + +/* Issue a netlink message and wait for a response, calling 'callback' for every response message */ +int netlink_request(int s, struct nlmsghdr *n, int (*callback) (struct nlmsghdr *n, void*u), void *u); + +int addattr32(struct nlmsghdr *n, int maxlen, int type, int data); +int addattr_l(struct nlmsghdr *n, int maxlen, int type, void *data, int alen); + +int netlink_open(void); + + +#endif + -- cgit