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Add force_bind
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40
src/force_bind/PKGBUILD
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40
src/force_bind/PKGBUILD
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# Maintainer: Kevin MacMartin <prurigro@gmail.com>
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pkgname=force_bind
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pkgver=0.13
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pkgrel=1
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pkgdesc='Force binding on a specific IP and/or port, change TTL/TOS/KA/MSS/REUSEADDR/FWMARK/PRIORITY. Works with both IPv4 and IPv6. Also, you can enforce bandwidth per process or per socket'
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url='http://kernel.embedromix.ro/us/'
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license=('GPL3')
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arch=('i686' 'x86_64' 'armv6h' 'armv7h')
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depends=('glibc')
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source=(
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"http://kernel.embedromix.ro/us/$pkgname/$pkgname-$pkgver.tar.gz"
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"$pkgname.1"
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"${pkgname}_null-to-strcmp-fix.patch"
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)
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sha512sums=(
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'37aaac1407118bbeb2ec484318afb1d517979c620ace9eca87b609cf99e7c9cfdc03863d42f017f28567fcbb7f8a23fac33aa70fad379c7841da31be16143da1'
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'4eac471df6329f09ba4f8e66fbdd12daaff58221fbbfacf37d10d5017d9afcf8dd79d9330ca3044310c7c7cf4106f645fea81329d32f76cc15c8524d2677b0ad'
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'3e33eb1158dd89737fa62c018ff5af0419a3900315875363f30194c8ae0cceecd943d2c8e1f139127f5b092c428597f1a570ff072c0c29a60082bc6b990f4be9'
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)
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prepare() {
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cd $pkgname-$pkgver
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patch -p1 < ../${pkgname}_null-to-strcmp-fix.patch
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}
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build() {
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cd $pkgname-$pkgver
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./configure --prefix=/usr
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make
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}
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package() {
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install -Dm644 $pkgname.1 "$pkgdir/usr/share/man/man1/$pkgname.1"
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cd $pkgname-$pkgver
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make DESTDIR="$pkgdir" install
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mv "$pkgdir/usr/lib64" "$pkgdir/usr/lib"
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}
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187
src/force_bind/force_bind.1
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187
src/force_bind/force_bind.1
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.TH FORCE_BIND "1"
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.SH NAME
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FORCE_BIND
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.SH AUTHOR
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Catalin(ux) M. BOIE \- catab at embedromix dot ro
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.SH DESCRIPTION
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Force an application to bind on a specific IP and/or port. Plus forcing setsockopt calls on the socket. Works with both IPv4 and IPv6.
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.TP
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It is useful if you have a binary application without sources and without the possibility to configure address or port to bind to.
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.SH LICENSE
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GPLv3
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.SH HOW IT WORKS
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force_bind is a shared object that is loaded with LD_PRELOAD and hooks 'bind' function. Forcing an IP/port to bind to is done with environments variables.
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.SH EXAMPLES
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0. Output debug stuff in a log file (for debugging):
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.TP
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\fB export FORCE_NET_VERBOSE=999
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.TP
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\fB export FORCE_NET_LOG="xxx.log"
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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.TP
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1. Force bind to 127.0.0.1, port 33, verbose operations:
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.TP
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\fB export FORCE_NET_VERBOSE=1
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.TP
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\fB export FORCE_BIND_ADDRESS_V4=127.0.0.1
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.TP
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\fB export FORCE_BIND_PORT_V4=33
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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.TP
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2. Force binding to 127.0.0.2, port unchanged
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.TP
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\fB export FORCE_BIND_ADDRESS_V4=127.0.0.2
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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.TP
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3. Force binding to ::1 (IPv6), port unchanged
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.TP
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\fB export FORCE_BIND_ADDRESS_V6=::1
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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.TP
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4. Changing TOS on all sockets to 30
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.TP
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\fB export FORCE_NET_TOS=30
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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.TP
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5. Force Keep alive to 60 seconds:
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.TP
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\fB export FORCE_NET_KA=60
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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.TP
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6. Force MSS to 1400
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.TP
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\fB export FORCE_NET_MSS=1400
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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.TP
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7. Force bandwidth to 1000 bytes/s for _all_ connections, cumulated
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.TP
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\fB export FORCE_NET_BW=1000
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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.TP
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8. Force bandwidth to 20000 bytes/s per socket
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.TP
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\fB export FORCE_NET_BW_PER_SOCKET=20000
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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.TP
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9. Force REUSEADDR
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.TP
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\fB export FORCE_NET_REUSEADDR=1
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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.TP
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10. Force NODELAY
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.TP
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\fB export FORCE_NET_NODELAY=1
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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.TP
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11. Force client connections (for example 'telnet', 'ssh', 'firefox') to connect from a specified address, not the auto selected one:
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.TP
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\fB export FORCE_NET_VERBOSE=1
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.TP
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\fB export FORCE_BIND_ADDRESS_V4=127.0.0.2
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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.TP
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12. Set a FLOWINFO (flow label + class) for a client connection:
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.TP
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\fB export FORCE_NET_VERBOSE=1
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.TP
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\fB export FORCE_NET_FLOWINFO=0x7812345 # class 0x78, label 0x12345
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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.TP
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13. Force FWMARK on a connection (only root can do it):
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.TP
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\fB export FORCE_NET_VERBOSE=1
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.TP
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\fB export FORCE_NET_FWMARK=0x1234
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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.TP
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14. Force priority (between 0 and 6 for non-root users). You can use 'tc' command from iproute to set-up 'prio' qdisc and to assign prio to queues:
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.TP
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\fB # 0. setup
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.TP
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\fB export FORCE_NET_VERBOSE=1
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB # 1. Make sure you have a 'prio' qdisc attached to eth0, for example:
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.TP
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\fB tc qdisc add ev eth0 root handle 1: prio
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.TP
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\fB # 2. Assign applications to classed (bands):
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.TP
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\fB export FORCE_NET_PRIO=6 # interactive, band 0
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.TP
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\fB your_voip_program_here
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.TP
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\fB export FORCE_NET_PRIO=0 # best effort, band 1
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.TP
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\fB your_mail_program_here
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.TP
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\fB export FORCE_NET_PRIO=2 # bulk, band 2
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.TP
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\fB your_remote_backup_program_here
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.TP
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\fB # 3. Run tc statistics so you can see the classification:
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.TP
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\fB tc -s class show dev eth0
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.TP
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15. Deny binding to any IPv4 sockets. The bind syscall will return -1 and errno will be set to EACCES.
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.TP
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\fB export FORCE_NET_VERBOSE=1
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.TP
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\fB export FORCE_BIND_ADDRESS_V4=deny
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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.TP
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16. Silent fake binding to any IPv6 sockets. The bind will return success, but will never accept any connection.
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.TP
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\fB export FORCE_NET_VERBOSE=1
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.TP
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\fB export FORCE_BIND_ADDRESS_V6=fake
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.TP
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\fB export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
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.TP
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\fB your_program_here
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14
src/force_bind/force_bind_null-to-strcmp-fix.patch
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14
src/force_bind/force_bind_null-to-strcmp-fix.patch
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diff --git a/force_bind.c b/force_bind.c
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index 644e3a7..5656a05 100644
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--- a/force_bind.c
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+++ b/force_bind.c
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@@ -916,6 +916,9 @@ int bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen)
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case AF_INET6: force_address = force_address_v6; break;
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}
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+ if (force_address == NULL)
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+ break;
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+
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/* Test if we should deny the bind */
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if (strcmp(force_address, "deny") == 0) {
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xlog(1, "\tDeny binding to %s\n", tmp);
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