Write man pages and do some misc cleanup on old files.
Add more documentation to the README.
This commit is contained in:
Nicholas J. Kain
parent
2a1885bab4
commit
24db573005
85
README
85
README
@ -1,14 +1,12 @@
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ndhc + ifchd, copyright (c) 2004-2011 Nicholas Kain. Licensed under GNU GPL2.
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ndhc + ifchd, Copyright (C) 2004-2011 Nicholas J. Kain.
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Licensed under GNU GPL v2.
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Requirements:
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Requirements:
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Linux kernel (tested: 2.4, 2.6)
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Linux kernel (2.4 used to work long ago, but I only test 2.6 now)
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* libcap is required (available via ftp.kernel.org)
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C99-compliant C compiler (any recent GCC will work)
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GNU Make (tested: 3.82) or CMake (tested: 2.8)
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C99-compliant C compiler (for C99 struct subobject init)
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libcap (available via ftp.kernel.org)
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* any modern GCC should be sufficient
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CMake (tested: 2.8)
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Tested with glibc. dietlibc is not compatible. I have not tested uclibc.
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Tested with glibc. dietlibc is not compatible. I have not tested uclibc.
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@ -51,6 +49,42 @@ explicitly deconfigured. This functionality can be useful on wired networks
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when transient carrier downtimes occur (or cables are changed), but it is
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when transient carrier downtimes occur (or cables are changed), but it is
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particularly useful on wireless networks.
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particularly useful on wireless networks.
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FEATURES
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--------
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Privilege-seperated. Neither ifchd or ndhc runs as full root, and capabilities
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are divided between the programs. Both programs run in a chroot.
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Robust. ndhc performs no runtime heap allocations -- malloc() is never called
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(and neither is brk(), mmap(), etc), and ndhc never performs recursive calls
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and only stack-allocates fixed-length types, so stack depth is bounded, too.
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ifchd lightly uses malloc(), but no heap allocations have long lifetimes, and
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are bounded from being large.
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Active defense of IP address and IP collision avoidance. ndhc fully implements
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RFC5227. It is capable of both a normal level of tenacity in defense, where
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it will eventually back off and request a new lease if a peer won't relent
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in the case of a conflict, and of relentlessly defending a lease forever. In
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either mode, it rate-limits defense messages, so it can't be tricked into
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flooding by a hostile peer or DHCP server, either.
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Small. Both ndhc and ifchd avoid outside dependencies and are written in
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plain C.
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Fast. ndhc filters input using the BPF/LPF mechanism so that uninteresting
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packets are dropped by the operating system before ndhc even sees the data.
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ndhc also only listens to DHCP traffic when it's necessary.
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Flexible. ndhc can request particular IPs, send user-specified client IDs,
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write a file that contains the current lease IP, write PID files, etc. One
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ifchd session can service multiple ndhc sessions.
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Aware of the hardware link status. If you disconnect an interface on which
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ndhc is providing dhcp service, it will be aware. When the link status
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returns, ndhc will fingerprint the reconnected network and make sure that it
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corresponds to the one on which it has a lease. If the new network is
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different, it will forget about the old lease and request a new one.
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USAGE
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USAGE
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-----
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-----
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@ -153,8 +187,10 @@ be used multiple times to allow multiple interfaces.
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PORTING NOTES
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PORTING NOTES
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-------------
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-------------
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ndhc is rather platform-dependent, and it extensively uses Linux-specific
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DHCP clients aren't naturally very portable. It's necessary to perform a lot
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features. Some of these features are also available on the BSDs.
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of tasks that are platform-specific. ndhc is rather platform-dependent, and it
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extensively uses Linux-specific features. Some of these features are also
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available on the BSDs.
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1) Both ndhc and ifchd use the SO_PEERCRED flag of getsockopt() to discriminate
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1) Both ndhc and ifchd use the SO_PEERCRED flag of getsockopt() to discriminate
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authorized connections by uid, gid, and pid. Similar functionality exists in
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authorized connections by uid, gid, and pid. Similar functionality exists in
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@ -265,5 +301,34 @@ Make sure that CONFIG_GRKERNSEC_CHROOT_CAPS is disabled. Otherwise, ifchd will
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lose its capabilities (in particular, the ability to reconfigure interfaces)
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lose its capabilities (in particular, the ability to reconfigure interfaces)
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when it chroots.
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when it chroots.
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DHCP PROTOCOL QUIRKS
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--------------------
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Send a packet that has an options field set to:
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'DHCP-OPTION-OVERLOAD:3'
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Then in the file and sname fields:
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'DHCP-OPTION-OVERLOAD:3'
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I suspect some bad dhcp programs will hang given this input.
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Options concatenation is a minefield of poor specification. There's a
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follow-up RFC to make proper behavior somewhat more defined, but it's still
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overly complex.
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DHCP explicitly specifies that there is no minimum lease time and also
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specifies that the minimum default rebinding time is leasetime*0.875 and
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the minimum default renewing time is leasetime*0.500. All times are relative
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to the instant when the lease is bound and are specified in seconds. Taken
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together, this means that a client strictly implementing the RFC should
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accept a lease that either is perpetually rebinding (lease == 1s) or instantly
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expires (lease == 0s). ndhc ignores the RFC and specifies a minimum lease
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time of one minute.
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Renew and rebind times are optionally specified and may take on any value.
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This means that a malicious server could demand a rebind time before a renew
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time, or make these times ridiculously short, or specify both times past
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that of the lease duration. ndhc avoids all of this nonsense by simply
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ignoring these options and using the default values specified by the RFC.
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There are other quirks, but these are just several interesting ones that
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immediately occur to me while I'm writing this document.
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@ -1,64 +0,0 @@
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20040906
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accept_conns() trivial correctness fix: EINTR return from accept should
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force continue rather than break in handling loop.
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fail_on_fdne() is now file_exists() with a slightly different API.
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20040818
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Use inet_aton rather than custom function; daemon.[ch] removed.
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20040817
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ifchd no longer logs a "FATAL - select returned an error!" when it
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is -KILL'ed.
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20040626
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pending_exit is now static volatile sig_atomic_t rather than
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static volatile int for pedantic correctness issues.
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20040614
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Added --interface (-i) option that allows one to restrict the
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interfaces that ifchd clients are allowed to modify. I
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reccomend that this flag be used to further mitigate the possible
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effects of a compromised client. By default, all interfaces
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may be modified by clients.
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Minor cleanups.
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Clear corresponding namesvrs and domains on socket disconnection.
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20040613
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Factor out Linux-specific code into linux.c.
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Nameservers and search domains now tracked per-connection to
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prevent races where a client could force a writeout of data
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provided by another client.
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Interface name now cleared on connection close.
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Make all headers idempotent.
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Minor improvements to error messages.
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20040612
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Removed iffd[] array; this change makes the state machine action
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functions (perform_*) depend on less external state.
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HOSTNAME command now supported; it is not enabled by default.
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If you wish for remote daemons to be able to change the hostname
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of the local machine, use the --hostname (-o) option.
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20040610
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Added MTU support.
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20040609
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Robustify so that suicide() isn't called at every possible failure.
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Harmless failures will now simply print an error to the log. Risky
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or severe errors still suicide().
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20040608
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Added support for resolv.conf, namely "nameserver" and "search" entries.
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Make strlist more robust and paranoid.
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20040607
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Improved accept() code to be much more robust; it can now properly error
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recover. I hope this will fix the elusive random-exit problem that
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plagues machines running the 2.6 kernel.
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Refactored dispatch_work() to be cleaner.
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91
ifchd/ifchd.8
Normal file
91
ifchd/ifchd.8
Normal file
@ -0,0 +1,91 @@
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.TH IFCHD 8 2011-07-12 Linux "Linux Administrator's Manual"
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.SH NAME
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ifchd \- interface change daemon
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.SH SYNOPSIS
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.B ifchd
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.RI [ OPTION ]...
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.SH DESCRIPTION
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The ifchd daemon changes network interface configuration information
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(such as the IP address, broadcast address, subnet, etc) as well as
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resolv.conf, the machine hostname, and other similar system configuration
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bits on the request of authorized clients such as ndhc instances.
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.SH OPTIONS
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.TP
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.BR \-d ,\ \-\-detach
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Immediately fork into the background. This is the default behavior.
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.TP
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.BR \-n ,\ \-\-nodetach
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Do not fork into the background. Useful for debugging or initial setup.
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.TP
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.BR \-q ,\ \-\-quiet
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Don't print to standard out, standard error, or syslog.
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.TP
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.BI \-c\ CHROOTDIR ,\ \-\-chroot= CHROOTDIR
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This option specifies the directory to which ifchd should confine itself via
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chroot() after startup. This directory should be shared with associated ndhc
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daemons, and should have access to dev/urandom and dev/null. For logging to
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work, a dev/log socket or device should also exist.
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.TP
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.BI \-r\ RESOLVCONF ,\ \-\-resolve= RESOLVCONF
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Specifies the path to the system resolv.conf. This file will typically be in
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/etc/resolv.conf. If this option is specified, ndhc will update the contents
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of this file to match the DNS servers specified by the remote DHCP server. If
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this option is not specified, ifchd will never change the system DNS resolution
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configuration.
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.TP
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.BR \-o ,\ \-\-hostname
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If specified, ifchd will update the system host name in response to any
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hostname option field provided by a remote DHCP server on the request of
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a ndhc client. If this option is not specified, ifchd will never change
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the system hostname.
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.TP
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.BI \-p\ PIDFILE ,\ \-\-pidfile= PIDFILE
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Write the process id number of the ifchd instance into the specified file name.
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The default is to not write the process id number into any file at all.
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.TP
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.BI \-u\ USER ,\ \-\-user= USER
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This option specifies the user name or user id that ifchd will change to after
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startup. This user should be unique to the ifchd daemon.
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.TP
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.BI \-g\ GROUP ,\ \-\-group= GROUP
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This option specifies the group name or group id that ifchd will change to
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after startup.
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.TP
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.BI \-U\ CLIENTUSER ,\ \-\-cuser= CLIENTUSER
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This option specifies the user name or user id that will be required of
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processes that wish to make interface change requests of ifchd. Any other
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users will be denied a connection to the ifchange socket.
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.TP
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.BI \-G\ CLIENTGROUP ,\ \-\-cgroup= CLIENTGROUP
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This option specifies the group name or group id that will be required of
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processes that wish to make interface change requests of ifchd. Any other
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groups will be denied a connection to the ifchange socket.
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.TP
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.BI \-P\ CLIENTPID ,\ \-\-cpid= CLIENTPID
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This option specifies the process id that will be required to make interface
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change requests of ifchd. Any process that has a process id that does not
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equal this value will be denied a connection to the ifchange socket.
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.TP
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.BI \-i\ INTERFACE ,\ \-\-interface= INTERFACE
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Specifies an interface by name (such as 'eth0') on which ifchd is allowed to
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make configuration changes (such as IP address, subnet mask, etc). Multiple
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interfaces may be whitelisted by using this switch multiple times.
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.TP
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.BR \-V ,\ \-\-verbose
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Print detailed messages. Useful for debugging or setup.
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.TP
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.BR \-h ,\ \-\-help
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Print basic help information and exit.
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.TP
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.BR \-v ,\ \-\-version
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Display the ifchd version number and copyright information.
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.SH SIGNALS
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It is not necessary to sleep between sending signals, as signals received are
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processed sequentially in the order they are received. ifchd does not
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perform any unusual behavior on receipt of signals.
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.SH NOTES
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ifchd is rather minimal and doesn't do exotic things like change NTP server
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configuration. This is intentional, since it needs to run as CAP_NET_ADMIN,
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which although far less powerful than root, still gives it a fair amount
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of privileged behavior.
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339
ndhc/COPYING
339
ndhc/COPYING
@ -1,339 +0,0 @@
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GNU GENERAL PUBLIC LICENSE
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Version 2, June 1991
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Copyright (C) 1989, 1991 Free Software Foundation, Inc.
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||||||
675 Mass Ave, Cambridge, MA 02139, USA
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Everyone is permitted to copy and distribute verbatim copies
|
|
||||||
of this license document, but changing it is not allowed.
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Preamble
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||||||
The licenses for most software are designed to take away your
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||||||
freedom to share and change it. By contrast, the GNU General Public
|
|
||||||
License is intended to guarantee your freedom to share and change free
|
|
||||||
software--to make sure the software is free for all its users. This
|
|
||||||
General Public License applies to most of the Free Software
|
|
||||||
Foundation's software and to any other program whose authors commit to
|
|
||||||
using it. (Some other Free Software Foundation software is covered by
|
|
||||||
the GNU Library General Public License instead.) You can apply it to
|
|
||||||
your programs, too.
|
|
||||||
|
|
||||||
When we speak of free software, we are referring to freedom, not
|
|
||||||
price. Our General Public Licenses are designed to make sure that you
|
|
||||||
have the freedom to distribute copies of free software (and charge for
|
|
||||||
this service if you wish), that you receive source code or can get it
|
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||||||
if you want it, that you can change the software or use pieces of it
|
|
||||||
in new free programs; and that you know you can do these things.
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|
||||||
|
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||||||
To protect your rights, we need to make restrictions that forbid
|
|
||||||
anyone to deny you these rights or to ask you to surrender the rights.
|
|
||||||
These restrictions translate to certain responsibilities for you if you
|
|
||||||
distribute copies of the software, or if you modify it.
|
|
||||||
|
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||||||
For example, if you distribute copies of such a program, whether
|
|
||||||
gratis or for a fee, you must give the recipients all the rights that
|
|
||||||
you have. You must make sure that they, too, receive or can get the
|
|
||||||
source code. And you must show them these terms so they know their
|
|
||||||
rights.
|
|
||||||
|
|
||||||
We protect your rights with two steps: (1) copyright the software, and
|
|
||||||
(2) offer you this license which gives you legal permission to copy,
|
|
||||||
distribute and/or modify the software.
|
|
||||||
|
|
||||||
Also, for each author's protection and ours, we want to make certain
|
|
||||||
that everyone understands that there is no warranty for this free
|
|
||||||
software. If the software is modified by someone else and passed on, we
|
|
||||||
want its recipients to know that what they have is not the original, so
|
|
||||||
that any problems introduced by others will not reflect on the original
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|
||||||
authors' reputations.
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|
||||||
|
|
||||||
Finally, any free program is threatened constantly by software
|
|
||||||
patents. We wish to avoid the danger that redistributors of a free
|
|
||||||
program will individually obtain patent licenses, in effect making the
|
|
||||||
program proprietary. To prevent this, we have made it clear that any
|
|
||||||
patent must be licensed for everyone's free use or not licensed at all.
|
|
||||||
|
|
||||||
The precise terms and conditions for copying, distribution and
|
|
||||||
modification follow.
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|
||||||
|
|
||||||
GNU GENERAL PUBLIC LICENSE
|
|
||||||
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
|
|
||||||
|
|
||||||
0. This License applies to any program or other work which contains
|
|
||||||
a notice placed by the copyright holder saying it may be distributed
|
|
||||||
under the terms of this General Public License. The "Program", below,
|
|
||||||
refers to any such program or work, and a "work based on the Program"
|
|
||||||
means either the Program or any derivative work under copyright law:
|
|
||||||
that is to say, a work containing the Program or a portion of it,
|
|
||||||
either verbatim or with modifications and/or translated into another
|
|
||||||
language. (Hereinafter, translation is included without limitation in
|
|
||||||
the term "modification".) Each licensee is addressed as "you".
|
|
||||||
|
|
||||||
Activities other than copying, distribution and modification are not
|
|
||||||
covered by this License; they are outside its scope. The act of
|
|
||||||
running the Program is not restricted, and the output from the Program
|
|
||||||
is covered only if its contents constitute a work based on the
|
|
||||||
Program (independent of having been made by running the Program).
|
|
||||||
Whether that is true depends on what the Program does.
|
|
||||||
|
|
||||||
1. You may copy and distribute verbatim copies of the Program's
|
|
||||||
source code as you receive it, in any medium, provided that you
|
|
||||||
conspicuously and appropriately publish on each copy an appropriate
|
|
||||||
copyright notice and disclaimer of warranty; keep intact all the
|
|
||||||
notices that refer to this License and to the absence of any warranty;
|
|
||||||
and give any other recipients of the Program a copy of this License
|
|
||||||
along with the Program.
|
|
||||||
|
|
||||||
You may charge a fee for the physical act of transferring a copy, and
|
|
||||||
you may at your option offer warranty protection in exchange for a fee.
|
|
||||||
|
|
||||||
2. You may modify your copy or copies of the Program or any portion
|
|
||||||
of it, thus forming a work based on the Program, and copy and
|
|
||||||
distribute such modifications or work under the terms of Section 1
|
|
||||||
above, provided that you also meet all of these conditions:
|
|
||||||
|
|
||||||
a) You must cause the modified files to carry prominent notices
|
|
||||||
stating that you changed the files and the date of any change.
|
|
||||||
|
|
||||||
b) You must cause any work that you distribute or publish, that in
|
|
||||||
whole or in part contains or is derived from the Program or any
|
|
||||||
part thereof, to be licensed as a whole at no charge to all third
|
|
||||||
parties under the terms of this License.
|
|
||||||
|
|
||||||
c) If the modified program normally reads commands interactively
|
|
||||||
when run, you must cause it, when started running for such
|
|
||||||
interactive use in the most ordinary way, to print or display an
|
|
||||||
announcement including an appropriate copyright notice and a
|
|
||||||
notice that there is no warranty (or else, saying that you provide
|
|
||||||
a warranty) and that users may redistribute the program under
|
|
||||||
these conditions, and telling the user how to view a copy of this
|
|
||||||
License. (Exception: if the Program itself is interactive but
|
|
||||||
does not normally print such an announcement, your work based on
|
|
||||||
the Program is not required to print an announcement.)
|
|
||||||
|
|
||||||
These requirements apply to the modified work as a whole. If
|
|
||||||
identifiable sections of that work are not derived from the Program,
|
|
||||||
and can be reasonably considered independent and separate works in
|
|
||||||
themselves, then this License, and its terms, do not apply to those
|
|
||||||
sections when you distribute them as separate works. But when you
|
|
||||||
distribute the same sections as part of a whole which is a work based
|
|
||||||
on the Program, the distribution of the whole must be on the terms of
|
|
||||||
this License, whose permissions for other licensees extend to the
|
|
||||||
entire whole, and thus to each and every part regardless of who wrote it.
|
|
||||||
|
|
||||||
Thus, it is not the intent of this section to claim rights or contest
|
|
||||||
your rights to work written entirely by you; rather, the intent is to
|
|
||||||
exercise the right to control the distribution of derivative or
|
|
||||||
collective works based on the Program.
|
|
||||||
|
|
||||||
In addition, mere aggregation of another work not based on the Program
|
|
||||||
with the Program (or with a work based on the Program) on a volume of
|
|
||||||
a storage or distribution medium does not bring the other work under
|
|
||||||
the scope of this License.
|
|
||||||
|
|
||||||
3. You may copy and distribute the Program (or a work based on it,
|
|
||||||
under Section 2) in object code or executable form under the terms of
|
|
||||||
Sections 1 and 2 above provided that you also do one of the following:
|
|
||||||
|
|
||||||
a) Accompany it with the complete corresponding machine-readable
|
|
||||||
source code, which must be distributed under the terms of Sections
|
|
||||||
1 and 2 above on a medium customarily used for software interchange; or,
|
|
||||||
|
|
||||||
b) Accompany it with a written offer, valid for at least three
|
|
||||||
years, to give any third party, for a charge no more than your
|
|
||||||
cost of physically performing source distribution, a complete
|
|
||||||
machine-readable copy of the corresponding source code, to be
|
|
||||||
distributed under the terms of Sections 1 and 2 above on a medium
|
|
||||||
customarily used for software interchange; or,
|
|
||||||
|
|
||||||
c) Accompany it with the information you received as to the offer
|
|
||||||
to distribute corresponding source code. (This alternative is
|
|
||||||
allowed only for noncommercial distribution and only if you
|
|
||||||
received the program in object code or executable form with such
|
|
||||||
an offer, in accord with Subsection b above.)
|
|
||||||
|
|
||||||
The source code for a work means the preferred form of the work for
|
|
||||||
making modifications to it. For an executable work, complete source
|
|
||||||
code means all the source code for all modules it contains, plus any
|
|
||||||
associated interface definition files, plus the scripts used to
|
|
||||||
control compilation and installation of the executable. However, as a
|
|
||||||
special exception, the source code distributed need not include
|
|
||||||
anything that is normally distributed (in either source or binary
|
|
||||||
form) with the major components (compiler, kernel, and so on) of the
|
|
||||||
operating system on which the executable runs, unless that component
|
|
||||||
itself accompanies the executable.
|
|
||||||
|
|
||||||
If distribution of executable or object code is made by offering
|
|
||||||
access to copy from a designated place, then offering equivalent
|
|
||||||
access to copy the source code from the same place counts as
|
|
||||||
distribution of the source code, even though third parties are not
|
|
||||||
compelled to copy the source along with the object code.
|
|
||||||
|
|
||||||
4. You may not copy, modify, sublicense, or distribute the Program
|
|
||||||
except as expressly provided under this License. Any attempt
|
|
||||||
otherwise to copy, modify, sublicense or distribute the Program is
|
|
||||||
void, and will automatically terminate your rights under this License.
|
|
||||||
However, parties who have received copies, or rights, from you under
|
|
||||||
this License will not have their licenses terminated so long as such
|
|
||||||
parties remain in full compliance.
|
|
||||||
|
|
||||||
5. You are not required to accept this License, since you have not
|
|
||||||
signed it. However, nothing else grants you permission to modify or
|
|
||||||
distribute the Program or its derivative works. These actions are
|
|
||||||
prohibited by law if you do not accept this License. Therefore, by
|
|
||||||
modifying or distributing the Program (or any work based on the
|
|
||||||
Program), you indicate your acceptance of this License to do so, and
|
|
||||||
all its terms and conditions for copying, distributing or modifying
|
|
||||||
the Program or works based on it.
|
|
||||||
|
|
||||||
6. Each time you redistribute the Program (or any work based on the
|
|
||||||
Program), the recipient automatically receives a license from the
|
|
||||||
original licensor to copy, distribute or modify the Program subject to
|
|
||||||
these terms and conditions. You may not impose any further
|
|
||||||
restrictions on the recipients' exercise of the rights granted herein.
|
|
||||||
You are not responsible for enforcing compliance by third parties to
|
|
||||||
this License.
|
|
||||||
|
|
||||||
7. If, as a consequence of a court judgment or allegation of patent
|
|
||||||
infringement or for any other reason (not limited to patent issues),
|
|
||||||
conditions are imposed on you (whether by court order, agreement or
|
|
||||||
otherwise) that contradict the conditions of this License, they do not
|
|
||||||
excuse you from the conditions of this License. If you cannot
|
|
||||||
distribute so as to satisfy simultaneously your obligations under this
|
|
||||||
License and any other pertinent obligations, then as a consequence you
|
|
||||||
may not distribute the Program at all. For example, if a patent
|
|
||||||
license would not permit royalty-free redistribution of the Program by
|
|
||||||
all those who receive copies directly or indirectly through you, then
|
|
||||||
the only way you could satisfy both it and this License would be to
|
|
||||||
refrain entirely from distribution of the Program.
|
|
||||||
|
|
||||||
If any portion of this section is held invalid or unenforceable under
|
|
||||||
any particular circumstance, the balance of the section is intended to
|
|
||||||
apply and the section as a whole is intended to apply in other
|
|
||||||
circumstances.
|
|
||||||
|
|
||||||
It is not the purpose of this section to induce you to infringe any
|
|
||||||
patents or other property right claims or to contest validity of any
|
|
||||||
such claims; this section has the sole purpose of protecting the
|
|
||||||
integrity of the free software distribution system, which is
|
|
||||||
implemented by public license practices. Many people have made
|
|
||||||
generous contributions to the wide range of software distributed
|
|
||||||
through that system in reliance on consistent application of that
|
|
||||||
system; it is up to the author/donor to decide if he or she is willing
|
|
||||||
to distribute software through any other system and a licensee cannot
|
|
||||||
impose that choice.
|
|
||||||
|
|
||||||
This section is intended to make thoroughly clear what is believed to
|
|
||||||
be a consequence of the rest of this License.
|
|
||||||
|
|
||||||
8. If the distribution and/or use of the Program is restricted in
|
|
||||||
certain countries either by patents or by copyrighted interfaces, the
|
|
||||||
original copyright holder who places the Program under this License
|
|
||||||
may add an explicit geographical distribution limitation excluding
|
|
||||||
those countries, so that distribution is permitted only in or among
|
|
||||||
countries not thus excluded. In such case, this License incorporates
|
|
||||||
the limitation as if written in the body of this License.
|
|
||||||
|
|
||||||
9. The Free Software Foundation may publish revised and/or new versions
|
|
||||||
of the General Public License from time to time. Such new versions will
|
|
||||||
be similar in spirit to the present version, but may differ in detail to
|
|
||||||
address new problems or concerns.
|
|
||||||
|
|
||||||
Each version is given a distinguishing version number. If the Program
|
|
||||||
specifies a version number of this License which applies to it and "any
|
|
||||||
later version", you have the option of following the terms and conditions
|
|
||||||
either of that version or of any later version published by the Free
|
|
||||||
Software Foundation. If the Program does not specify a version number of
|
|
||||||
this License, you may choose any version ever published by the Free Software
|
|
||||||
Foundation.
|
|
||||||
|
|
||||||
10. If you wish to incorporate parts of the Program into other free
|
|
||||||
programs whose distribution conditions are different, write to the author
|
|
||||||
to ask for permission. For software which is copyrighted by the Free
|
|
||||||
Software Foundation, write to the Free Software Foundation; we sometimes
|
|
||||||
make exceptions for this. Our decision will be guided by the two goals
|
|
||||||
of preserving the free status of all derivatives of our free software and
|
|
||||||
of promoting the sharing and reuse of software generally.
|
|
||||||
|
|
||||||
NO WARRANTY
|
|
||||||
|
|
||||||
11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
|
|
||||||
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
|
|
||||||
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
|
|
||||||
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
|
|
||||||
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
||||||
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
|
|
||||||
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
|
|
||||||
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
|
|
||||||
REPAIR OR CORRECTION.
|
|
||||||
|
|
||||||
12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
|
|
||||||
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
|
|
||||||
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
|
|
||||||
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
|
|
||||||
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
|
|
||||||
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
|
|
||||||
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
|
|
||||||
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
|
|
||||||
POSSIBILITY OF SUCH DAMAGES.
|
|
||||||
|
|
||||||
END OF TERMS AND CONDITIONS
|
|
||||||
|
|
||||||
Appendix: How to Apply These Terms to Your New Programs
|
|
||||||
|
|
||||||
If you develop a new program, and you want it to be of the greatest
|
|
||||||
possible use to the public, the best way to achieve this is to make it
|
|
||||||
free software which everyone can redistribute and change under these terms.
|
|
||||||
|
|
||||||
To do so, attach the following notices to the program. It is safest
|
|
||||||
to attach them to the start of each source file to most effectively
|
|
||||||
convey the exclusion of warranty; and each file should have at least
|
|
||||||
the "copyright" line and a pointer to where the full notice is found.
|
|
||||||
|
|
||||||
<one line to give the program's name and a brief idea of what it does.>
|
|
||||||
Copyright (C) 19yy <name of author>
|
|
||||||
|
|
||||||
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.
|
|
||||||
|
|
||||||
Also add information on how to contact you by electronic and paper mail.
|
|
||||||
|
|
||||||
If the program is interactive, make it output a short notice like this
|
|
||||||
when it starts in an interactive mode:
|
|
||||||
|
|
||||||
Gnomovision version 69, Copyright (C) 19yy name of author
|
|
||||||
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
|
|
||||||
This is free software, and you are welcome to redistribute it
|
|
||||||
under certain conditions; type `show c' for details.
|
|
||||||
|
|
||||||
The hypothetical commands `show w' and `show c' should show the appropriate
|
|
||||||
parts of the General Public License. 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.
|
|
||||||
|
|
||||||
<signature of Ty Coon>, 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.
|
|
||||||
64
ndhc/README
64
ndhc/README
@ -1,64 +0,0 @@
|
|||||||
ndhc client
|
|
||||||
--------------------
|
|
||||||
|
|
||||||
The ndhc client negotiates a lease with the DHCP server and notifies
|
|
||||||
ifchd when a leases is obtained or lost.
|
|
||||||
|
|
||||||
|
|
||||||
command line options
|
|
||||||
-------------------
|
|
||||||
|
|
||||||
The command line options for the ndhc client are:
|
|
||||||
|
|
||||||
-c, --clientid=CLIENTID Client identifier
|
|
||||||
-H, --hostname=HOSTNAME Client hostname
|
|
||||||
-h, Alias for -H
|
|
||||||
-f, --foreground Do not fork after getting lease
|
|
||||||
-b, --background Fork to background if lease cannot be
|
|
||||||
immediately negotiated.
|
|
||||||
-i, --interface=INTERFACE Interface to use (default: eth0)
|
|
||||||
-n, --now Exit with failure if lease cannot be
|
|
||||||
immediately negotiated.
|
|
||||||
-q, --quit Quit after obtaining lease
|
|
||||||
-r, --request=IP IP address to request (default: none)
|
|
||||||
-v, --version Display version
|
|
||||||
|
|
||||||
|
|
||||||
If the requested IP address cannot be obtained, the client accepts the
|
|
||||||
address that the server offers.
|
|
||||||
|
|
||||||
|
|
||||||
note on ndhc's random seed
|
|
||||||
---------------------------
|
|
||||||
|
|
||||||
ndhc will seed its random number generator (used for generating xids)
|
|
||||||
by reading /dev/urandom. If you have a lot of embedded systems on the same
|
|
||||||
network, with no entropy, you can either seed /dev/urandom by a method of
|
|
||||||
your own, or doing the following on startup:
|
|
||||||
|
|
||||||
ifconfig eth0 > /dev/urandom
|
|
||||||
|
|
||||||
in order to seed /dev/urandom with some data (mac address) unique to your
|
|
||||||
system. If reading /dev/urandom fails, ndhc will fall back to its old
|
|
||||||
behavior of seeding with time(0).
|
|
||||||
|
|
||||||
|
|
||||||
signals accepted by ndhc
|
|
||||||
-------------------------
|
|
||||||
|
|
||||||
ndhc also responds to SIGUSR1 and SIGUSR2. SIGUSR1 will force a renew state,
|
|
||||||
and SIGUSR2 will force a release of the current lease, and cause ndhc to
|
|
||||||
go into an inactive state (until it is killed, or receives a SIGUSR1). You do
|
|
||||||
not need to sleep between sending signals, as signals received are processed
|
|
||||||
sequentially in the order they are received.
|
|
||||||
|
|
||||||
DHCP pitfalls
|
|
||||||
-------------
|
|
||||||
|
|
||||||
Send a packet that has an options field set to:
|
|
||||||
DHCP-OPTION-OVERLOAD:3
|
|
||||||
|
|
||||||
Then in the file and sname fields:
|
|
||||||
DHCP-OPTION-OVERLOAD:3
|
|
||||||
|
|
||||||
I suspect some bad dhcp programs will hang given this input.
|
|
||||||
113
ndhc/ndhc.8
113
ndhc/ndhc.8
@ -1,46 +1,93 @@
|
|||||||
.TH NDHC 8 2004-02-25 Linux "Linux Administrator's Manual"
|
.TH NDHC 8 2011-07-12 Linux "Linux Administrator's Manual"
|
||||||
.SH NAME
|
.SH NAME
|
||||||
ndhc \- secure DHCP client
|
ndhc \- secure DHCP client
|
||||||
.SH SYNOPSIS
|
.SH SYNOPSIS
|
||||||
.B ndhc
|
.B ndhc
|
||||||
.RI [ OPTION ]...
|
.RI [ OPTION ]...
|
||||||
.SH DESCRIPTION
|
.SH DESCRIPTION
|
||||||
The ndhc client negotiates a lease with the DHCP server and
|
The ndhc client negotiates a lease with the DHCP server and informs ifchd of
|
||||||
informs ifchd of the change when it is obtained or lost.
|
the change when it is obtained or lost. It also defends the assigned IP
|
||||||
|
address against hostile imposters and requests a new lease if it detects that
|
||||||
|
the interface has been connected to a new network. It requires a cooperating
|
||||||
|
ifchd server to properly perform its duties.
|
||||||
.SH OPTIONS
|
.SH OPTIONS
|
||||||
.TP
|
.TP
|
||||||
.BI \-c\ CLIENTID ,\ \-\-clientid= CLIENTID
|
.BI \-c\ CLIENTID ,\ \-\-clientid= CLIENTID
|
||||||
Send the client identifier
|
Specifies the client identifier that will be sent to the remote server. This
|
||||||
.IR CLIENTID .
|
can be any (reasonably sized, <64byte or so) text string, or an ethernet
|
||||||
|
MAC address in a form similar to 'aa:bb:cc:dd:ee:ff'. ndhc is smart enough
|
||||||
|
to recognize MAC addresses. ISP DHCP servers commonly check the value of this
|
||||||
|
field before providing a lease. The default value is the MAC address of
|
||||||
|
the network interface to which ndhc is bound.
|
||||||
.TP
|
.TP
|
||||||
.BR -f ,\ \-\-foreground
|
.BI \-h\ HOSTNAME ,\ \-\-hostname= HOSTNAME
|
||||||
Do not fork after obtaining a lease.
|
Send the specified client hostname to the remote DHCP server. This option
|
||||||
|
should not be necessary in most instances, but may perhaps be useful for odd
|
||||||
|
DHCP servers that perform some kind of authentication against the hostname
|
||||||
|
option field. The default is to send no hostname option at all.
|
||||||
.TP
|
.TP
|
||||||
.BI \-H\ HOSTNAME ,\ \-\-hostname= HOSTNAME
|
.BI \-v\ VENDORID ,\ \-\-vendorid= VENDORID
|
||||||
Send the client hostname
|
Send the specified vendor identification string to the remote DHCP server.
|
||||||
.IR HOSTNAME .
|
This option should not be necessary in most instances, but may perhaps be
|
||||||
|
useful for odd DHCP servers that perform some kind of authentication against
|
||||||
|
the vendor id option field. The default is to send the string 'ndhc'.
|
||||||
.TP
|
.TP
|
||||||
.BI \-h\ HOSTNAME
|
.BR \-f ,\ \-\-foreground
|
||||||
Alias for -H
|
Do not fork into the background after obtaining a lease.
|
||||||
.IR HOSTNAME .
|
.TP
|
||||||
|
.BR \-b ,\ \-\-background
|
||||||
|
Immediately fork into the background, even before obtaining a lease.
|
||||||
|
.TP
|
||||||
|
.BI \-p\ PIDFILE ,\ \-\-pidfile= PIDFILE
|
||||||
|
Write the process id number of the ndhc instance into the specified file name.
|
||||||
|
The default is to not write the process id number into any file at all.
|
||||||
|
.TP
|
||||||
|
.BI \-l\ LEASEFILE ,\ \-\-leasefile= LEASEFILE
|
||||||
|
Write the IP address of the currently held DHCP lease into the specified file
|
||||||
|
name. The default is to not write the lease IP address into any file at all.
|
||||||
|
This file can be quite useful for reacting to changes in IP address -- one
|
||||||
|
can listen for changes to it using fanotify() or inotify() on Linux.
|
||||||
.TP
|
.TP
|
||||||
.BI \-i\ INTERFACE ,\ \-\-interface= INTERFACE
|
.BI \-i\ INTERFACE ,\ \-\-interface= INTERFACE
|
||||||
Configure
|
Act as a DHCP client for the specified interface. A single ndhc daemon can
|
||||||
.IR INTERFACE .
|
only act as a DHCP client for a single interface. Specify the interface it
|
||||||
|
should use by name. The default is to listen on 'eth0'.
|
||||||
.TP
|
.TP
|
||||||
.BR -n ,\ \-\-now
|
.BR \-n ,\ \-\-now
|
||||||
Exit with failure if a lease cannot be obtained.
|
Exit with failure if a lease cannot be obtained. Useful for some init scripts.
|
||||||
.TP
|
.TP
|
||||||
.BR -q ,\ \-\-quit
|
.BR \-q ,\ \-\-quit
|
||||||
Exit after obtaining a lease.
|
Exit after obtaining a lease. Useful for some init scripts.
|
||||||
.TP
|
.TP
|
||||||
.BI \-r\ ADDRESS ,\ \-\-request= ADDRESS
|
.BI \-r\ IP ,\ \-\-request= IP
|
||||||
Request IP address
|
Request the specified IP address from the remote DHCP server. The DHCP server
|
||||||
.IR ADDRESS .
|
has no obligation to provide us with this IP, but it may acquiesce to the
|
||||||
|
request if it would not conflict with another host.
|
||||||
.TP
|
.TP
|
||||||
.BR -v ,\ \-\-version
|
.BI \-u\ USER ,\ \-\-user= USER
|
||||||
Display version.
|
This option specifies the user name or user id that ndhc will change to after
|
||||||
.SH NOTES
|
startup. ndhc will also change its group to match the default group of this
|
||||||
|
user. This user should have the ability to write to the ifchd socket of the
|
||||||
|
associated ifchd daemon. In practice, this requirement means that this user
|
||||||
|
should belong to the same group as the ifchd user.
|
||||||
|
.TP
|
||||||
|
.BI \-C\ CHROOTDIR ,\ \-\-chroot= CHROOTDIR
|
||||||
|
This option specifies the directory to which ndhc should confine itself via
|
||||||
|
chroot() after startup. This directory should be shared with the associated
|
||||||
|
ifchd daemon, and should have access to dev/urandom and dev/null. For
|
||||||
|
logging to work, a dev/log socket or device should also exist.
|
||||||
|
.TP
|
||||||
|
.BR \-d ,\ \-\-relentless-defense
|
||||||
|
If specified, ndhc will never back down in defending the IP address that it
|
||||||
|
has been assigned by the remote DHCP server. This behavior should not be
|
||||||
|
specified for average machines, but is useful for servers or routers where
|
||||||
|
the IP address of the machine must remain fixed for proper operation.
|
||||||
|
.TP
|
||||||
|
.BR \-v ,\ \-\-version
|
||||||
|
Display the ndhc version number.
|
||||||
|
.SH SIGNALS
|
||||||
|
It is not necessary to sleep between sending signals, as signals received are
|
||||||
|
processed sequentially in the order they are received.
|
||||||
.B ndhc
|
.B ndhc
|
||||||
responds to the following signals:
|
responds to the following signals:
|
||||||
.TP
|
.TP
|
||||||
@ -51,6 +98,18 @@ to renew the current lease or, if it does not have one, obtain a
|
|||||||
new lease.
|
new lease.
|
||||||
.TP
|
.TP
|
||||||
.B SIGUSR2
|
.B SIGUSR2
|
||||||
This signal caused
|
This signal causes
|
||||||
.B ndhc
|
.B ndhc
|
||||||
to release the current lease.
|
to release the current lease and go to sleep until it receives a SIGUSR1.
|
||||||
|
.SH NOTES
|
||||||
|
ndhc will seed its random number generator (used for generating xids)
|
||||||
|
by reading /dev/urandom. If you have a lot of embedded systems on the same
|
||||||
|
network, with no entropy, you can either seed /dev/urandom by a method of
|
||||||
|
your own, or doing the following on startup:
|
||||||
|
|
||||||
|
ifconfig eth0 > /dev/urandom
|
||||||
|
|
||||||
|
in order to seed /dev/urandom with some data (mac address) unique to your
|
||||||
|
system. If reading /dev/urandom fails, ndhc will fall back to seeding with
|
||||||
|
time(0).
|
||||||
|
|
||||||
|
|||||||
@ -79,6 +79,8 @@ struct client_config_t client_config = {
|
|||||||
static void show_usage(void)
|
static void show_usage(void)
|
||||||
{
|
{
|
||||||
printf(
|
printf(
|
||||||
|
"ndhc " VERSION ", dhcp client. Licensed under GNU GPL.\n"
|
||||||
|
"Copyright (C) 2004-2011 Nicholas J. Kain\n"
|
||||||
"Usage: ndhc [OPTIONS]\n\n"
|
"Usage: ndhc [OPTIONS]\n\n"
|
||||||
" -c, --clientid=CLIENTID Client identifier\n"
|
" -c, --clientid=CLIENTID Client identifier\n"
|
||||||
" -h, --hostname=HOSTNAME Client hostname\n"
|
" -h, --hostname=HOSTNAME Client hostname\n"
|
||||||
@ -312,7 +314,12 @@ int main(int argc, char **argv)
|
|||||||
arp_relentless_def = 1;
|
arp_relentless_def = 1;
|
||||||
break;
|
break;
|
||||||
case 'v':
|
case 'v':
|
||||||
printf("ndhc, version " VERSION "\n\n");
|
printf(
|
||||||
|
"ndhc %s, dhcp client. Licensed under GNU GPL.\n", VERSION);
|
||||||
|
printf(
|
||||||
|
"Copyright (C) 2004-2011 Nicholas J. Kain\n"
|
||||||
|
"This is free software; see the source for copying conditions. There is NO\n"
|
||||||
|
"WARRANTY; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n");
|
||||||
exit(EXIT_SUCCESS);
|
exit(EXIT_SUCCESS);
|
||||||
break;
|
break;
|
||||||
case 'V':
|
case 'V':
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user