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View Code? Open in Web Editor NEWExperimental library to force socket bind syscalls to use a specific IP address. Use at your own risk!
License: GNU General Public License v3.0
force_bind's Introduction
Name: force_bind
Author: Catali(ux) M. BOIE - catab at embedromix dot ro
Start date: 2010-10-26
Description: Force binding on a specific IP and/or port.
Works with both IPv4 and IPv6.
It is useful if you have a binary application without sources
and without the possibility to configure address or port to
bind to.
License: GPLv3
How it works: 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.
Examples:
0. Output debug stuff in a log file (for debugging):
export FORCE_NET_VERBOSE=999
export FORCE_NET_LOG="xxx.log"
your_program_here
1. Force bind to 127.0.0.1, port 33, verbose operations:
export FORCE_NET_VERBOSE=1
export FORCE_BIND_ADDRESS_V4=127.0.0.1
export FORCE_BIND_PORT_V4=33
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
your_program_here
2. Force binding to 127.0.0.2, port unchanged
export FORCE_BIND_ADDRESS_V4=127.0.0.2
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
your_program_here
3. Force binding to ::1 (IPv6), port unchanged
export FORCE_BIND_ADDRESS_V6=::1
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
your_program_here
4. Changing TOS on all sockets to 30
export FORCE_NET_TOS=30
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
your_program_here
5. Force Keep alive to 60 seconds:
export FORCE_NET_KA=60
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
your_program_here
6. Force MSS to 1400
export FORCE_NET_MSS=1400
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
your_program_here
7. Force bandwidth to 1000 bytes/s for _all_ connections, cumulated
export FORCE_NET_BW=1000
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
your_program_here
8. Force bandwidth to 20000 bytes/s per socket
export FORCE_NET_BW_PER_SOCKET=20000
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
scp root@machine1:/image.iso .
9. Force REUSEADDR
export FORCE_NET_REUSEADDR=1
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
your_program_here
10. Force NODELAY
export FORCE_NET_NODELAY=1
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
your_program_here
11. Force client connections (for example 'telnet', 'ssh',
'firefox') to connect from a specified address, not the auto
selected one:
export FORCE_NET_VERBOSE=1
export FORCE_BIND_ADDRESS_V4=127.0.0.2
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
your_program_here
12. Set a FLOWINFO (flow label + class) for a client connection:
export FORCE_NET_VERBOSE=1
export FORCE_NET_FLOWINFO=0x7812345 # class 0x78, label 0x12345
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
your_program_here
A tcpdump of a connection will look like:
00:00:00:00:00:00 > 00:00:00:00:00:00, ethertype IPv6 (0x86dd),
length 94: (class 0x78, flowlabel 0x12345, hlim 64, next-header TCP (6) payload length: 40)
::1.56981 > ::1.krb524: Flags [S], cksum 0x0030 (incorrect -> 0x91cf),
seq 1154252590, win 32752, options [mss 16376,sackOK,TS val 28395104 ecr 0,nop,wscale 4], length 0
13. Force FWMARK on a connection (only root is allowed):
export FORCE_NET_VERBOSE=1
export FORCE_NET_FWMARK=0x1234
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
your_program_here
14: Force priority (between 0 and 6 for non-root users). You can
use 'tc' command from iproute to set-up 'prio' qdisc and to
assign prio to queues:
# 0. setup
export FORCE_NET_VERBOSE=1
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
# 1. Make sure you have a 'prio' qdisc attached to eth0, for example:
tc qdisc add ev eth0 root handle 1: prio
# 2. Assign applications to classed (bands):
export FORCE_NET_PRIO=6 # interactive, band 0
your_voip_program_here
export FORCE_NET_PRIO=0 # best effort, band 1
your_mail_program_here
export FORCE_NET_PRIO=2 # bulk, band 2
your_remote_backup_program_here
# 3. Run tc statistics so you can see the classification:
tc -s class show dev eth0
15: Deny binding to any IPv4 sockets. The bind syscall
will return -1 and errno will be set to EACCES.
export FORCE_NET_VERBOSE=1
export FORCE_BIND_ADDRESS_V4=deny
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
your_program_here
16: Silent fake binding to any IPv6 sockets. The bind will
return success, but will never accept any connection.
export FORCE_NET_VERBOSE=1
export FORCE_BIND_ADDRESS_V6=fake
export LD_PRELOAD=${LD_PRELOAD}:/usr/lib/force_bind.so
your_program_here
Installation:
- ./configure
- make
- make install
force_bind's People
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raidum gabrielnicolasavellaneda tuian intika-linux-firewall-alternative mc-linhx q1352013520 alexandregz vorticity-flux lf-devjourney alxbnctforce_bind's Issues
Segfaults when using force_bind
Hi,
I have some segfaults when using some basic commands (less, man, cat), while having force_bind.so in LD_PRELOAD.
This produces segfault :
user@host:~$ cd /tmp/
user@host:/tmp$ export LD_PRELOAD=force_bind.so:
user@host:/tmp$ touch foo
user@host:/tmp$ less foo
Segmentation fault
user@host:/tmp$
Here is an strace when running less foo :
execve("/usr/bin/less", ["less", "foo"], [/* 19 vars */]) = 0
brk(0) = 0xad6000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4c31a57000
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=21754, ...}) = 0
mmap(NULL, 21754, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f4c31a51000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/tls/x86_64/force_bind.so", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/lib/x86_64-linux-gnu/tls/x86_64", 0x7fff7b7724b0) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/tls/force_bind.so", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/lib/x86_64-linux-gnu/tls", 0x7fff7b7724b0) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/x86_64/force_bind.so", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/lib/x86_64-linux-gnu/x86_64", 0x7fff7b7724b0) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/force_bind.so", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/lib/x86_64-linux-gnu", {st_mode=S_IFDIR|0755, st_size=12288, ...}) = 0
open("/usr/lib/x86_64-linux-gnu/tls/x86_64/force_bind.so", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/lib/x86_64-linux-gnu/tls/x86_64", 0x7fff7b7724b0) = -1 ENOENT (No such file or directory)
open("/usr/lib/x86_64-linux-gnu/tls/force_bind.so", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/lib/x86_64-linux-gnu/tls", 0x7fff7b7724b0) = -1 ENOENT (No such file or directory)
open("/usr/lib/x86_64-linux-gnu/x86_64/force_bind.so", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/lib/x86_64-linux-gnu/x86_64", 0x7fff7b7724b0) = -1 ENOENT (No such file or directory)
open("/usr/lib/x86_64-linux-gnu/force_bind.so", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/lib/x86_64-linux-gnu", {st_mode=S_IFDIR|0755, st_size=12288, ...}) = 0
open("/lib/tls/x86_64/force_bind.so", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/lib/tls/x86_64", 0x7fff7b7724b0) = -1 ENOENT (No such file or directory)
open("/lib/tls/force_bind.so", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/lib/tls", 0x7fff7b7724b0) = -1 ENOENT (No such file or directory)
open("/lib/x86_64/force_bind.so", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/lib/x86_64", 0x7fff7b7724b0) = -1 ENOENT (No such file or directory)
open("/lib/force_bind.so", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/lib", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
open("/usr/lib/tls/x86_64/force_bind.so", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/lib/tls/x86_64", 0x7fff7b7724b0) = -1 ENOENT (No such file or directory)
open("/usr/lib/tls/force_bind.so", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/lib/tls", 0x7fff7b7724b0) = -1 ENOENT (No such file or directory)
open("/usr/lib/x86_64/force_bind.so", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/lib/x86_64", 0x7fff7b7724b0) = -1 ENOENT (No such file or directory)
open("/usr/lib/force_bind.so", O_RDONLY) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\16\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|S_ISUID|S_ISGID|0755, st_size=127107, ...}) = 0
mmap(NULL, 2116864, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f4c31635000
mprotect(0x7f4c3163a000, 2093056, PROT_NONE) = 0
mmap(0x7f4c31839000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0x7f4c31839000
close(3) = 0
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libtinfo.so.5", O_RDONLY) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\323\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=167952, ...}) = 0
mmap(NULL, 2264608, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f4c3140c000
mprotect(0x7f4c31431000, 2093056, PROT_NONE) = 0
mmap(0x7f4c31630000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x24000) = 0x7f4c31630000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\357\1\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1595408, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4c31a50000
mmap(NULL, 3709016, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f4c31082000
mprotect(0x7f4c31202000, 2097152, PROT_NONE) = 0
mmap(0x7f4c31402000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x180000) = 0x7f4c31402000
mmap(0x7f4c31407000, 18520, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f4c31407000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libdl.so.2", O_RDONLY) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\r\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=14768, ...}) = 0
mmap(NULL, 2109696, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f4c30e7e000
mprotect(0x7f4c30e80000, 2097152, PROT_NONE) = 0
mmap(0x7f4c31080000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f4c31080000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4c31a4f000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4c31a4e000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4c31a4d000
arch_prctl(ARCH_SET_FS, 0x7f4c31a4e700) = 0
mprotect(0x7f4c31080000, 4096, PROT_READ) = 0
mprotect(0x7f4c31402000, 16384, PROT_READ) = 0
mprotect(0x7f4c31630000, 16384, PROT_READ) = 0
mprotect(0x620000, 4096, PROT_READ) = 0
mprotect(0x7f4c31a59000, 4096, PROT_READ) = 0
munmap(0x7f4c31a51000, 21754) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
brk(0) = 0xad6000
brk(0xaf7000) = 0xaf7000
stat("/home/nicolas/.terminfo", 0x7fff7b771290) = -1 ENOENT (No such file or directory)
stat("/etc/terminfo", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
access("/etc/terminfo/x/xterm", R_OK) = -1 ENOENT (No such file or directory)
stat("/lib/terminfo", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
access("/lib/terminfo/x/xterm", R_OK) = 0
open("/lib/terminfo/x/xterm", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=3315, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4c31a56000
read(3, "\32\1)\0&\0\17\0\235\1Z\5xterm|xterm-debian|X"..., 4096) = 3315
read(3, "", 4096) = 0
close(3) = 0
munmap(0x7f4c31a56000, 4096) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(1, TIOCGWINSZ, {ws_row=72, ws_col=270, ws_xpixel=0, ws_ypixel=0}) = 0
ioctl(2, TIOCGWINSZ, {ws_row=72, ws_col=270, ws_xpixel=0, ws_ypixel=0}) = 0
open("/usr/bin/.sysless", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/etc/sysless", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/home/nicolas/.less", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/locale-archive", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2031648, ...}) = 0
mmap(NULL, 2031648, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f4c3185c000
close(3) = 0
open("/home/nicolas/.lesshst", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0600, st_size=277, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4c31a56000
read(3, ".less-history-file:\n.search\n\"log"..., 4096) = 277
read(3, "", 4096) = 0
close(3) = 0
munmap(0x7f4c31a56000, 4096) = 0
open("/dev/tty", O_RDONLY) = 3
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
fsync(3) = -1 EINVAL (Invalid argument)
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(3, SNDCTL_TMR_STOP or TCSETSW, {B38400 opost isig -icanon -echo ...}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig -icanon -echo ...}) = 0
rt_sigaction(SIGINT, {0x414760, [INT], SA_RESTORER|SA_RESTART, 0x7f4c310b44f0}, {SIG_DFL, [], 0}, 8) = 0
rt_sigaction(SIGTSTP, {0x4146e0, [TSTP], SA_RESTORER|SA_RESTART, 0x7f4c310b44f0}, {SIG_DFL, [], 0}, 8) = 0
rt_sigaction(SIGWINCH, {0x414720, [WINCH], SA_RESTORER|SA_RESTART, 0x7f4c310b44f0}, {SIG_DFL, [], 0}, 8) = 0
rt_sigaction(SIGQUIT, {SIG_IGN, [QUIT], SA_RESTORER|SA_RESTART, 0x7f4c310b44f0}, {SIG_DFL, [], 0}, 8) = 0
stat("foo", {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
stat("foo", {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
open("foo", O_RDONLY) = 4
lseek(4, 1, SEEK_SET) = 1
lseek(4, 0, SEEK_SET) = 0
read(4, "", 256) = 0
lseek(4, 1, SEEK_SET) = 1
fstat(4, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
lseek(4, 0, SEEK_SET) = 0
stat("foo", {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++
Segmentation fault
Force bind is compiled from latest git, on a machine running Debian Wheezy amd64.
Regards,
N-Mi.
undefined symbol: dlsym
I am trying to run here with firefox/chromium browser @ Ubuntu 16.04 but after compile and try to run the first time I only got this message:
LD_PRELOAD="${LD_PRELOAD}:./force_bind.so"
export FORCE_BIND_ADDRESS_V6=2001:xxxx
firefox
/bin/sh: symbol lookup error: ./force_bind.so: undefined symbol: dlsym
Any idea/suggestion ?
force_bind doesn't work with UDP
Hi,
I don't know if you still maintain this code, but in doubt I fill this issue here.
I just compiled and installed force_bind from latest git, and could successfully use telnet and ping (after setuid the .so file).
I then tried to do some snmpget/snmpwalk on an equipment, and this doesn't work, while telnet and ping use the bind address configured in force_bind variables.
I checked with tcpdump and can observe that outgoing traffic for snmp requests are sourced with default interface IP, instead of the one declared in FORCE_BIND_ADDRESS_V4.
Here is the content of log file using verbose level 999 :
Init started...
Version: 0.11
Force bind to IPv4 address "172.21.17.38".
Init ended.
close(fd=3)
del(fd=3)
list...
socket(domain=IPv4, type=dgram, protocol=0)
socket_create_callback(3, IPv4, dgram)
add(fd=3, ...)
list...
fd= 3 type=dgram flags=0001 limit=0 rest=0 last=0.000000 dest=0/?/?
sendmsg(sockfd=3, ..., flags=0x4040)
change_local_binding(sockfd=3)
alter_sa(sockfd=3, ...)
bw(sockfd=3, bytes=45)
sendmsg(sockfd=3, ..., flags=0x4040)
change_local_binding(sockfd=3)
bw(sockfd=3, bytes=45)
sendmsg(sockfd=3, ..., flags=0x4040)
change_local_binding(sockfd=3)
bw(sockfd=3, bytes=45)
sendmsg(sockfd=3, ..., flags=0x4040)
change_local_binding(sockfd=3)
bw(sockfd=3, bytes=45)
sendmsg(sockfd=3, ..., flags=0x4040)
change_local_binding(sockfd=3)
bw(sockfd=3, bytes=45)
sendmsg(sockfd=3, ..., flags=0x4040)
change_local_binding(sockfd=3)
bw(sockfd=3, bytes=45)
close(fd=3)
del(fd=3)
list...
We can see in this trace that force_bind is loaded, and tries to bind on given address, but traffic is actually sent with another address.
I had the same behaviour trying to perform a DNS request using nslookup, so I believe the problem is with UDP in general.
Regard,
N-Mi.
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