macos – OS X Mountain Lion上的homebrew socat,sctp“不支持协议”

我正在努力开发一个涉及SCTP协议的爱好程序,掌握基础知识,我尝试使用 homebrew安装 socat,socat是一个类似netcat的工具,用于测试各种protoco.但到目前为止,在OS X Mountain Lion上没有取得任何成功.这是安装&错误日志:

$brew install socat
==> Installing socat dependency: readline
==> Downloading http://ftpmirror.gnu.org/readline/readline-6.2.tar.gz
######################################################################## 100.0%
tar: Failed to set default locale
==> Patching
patching file callback.c
patching file input.c
patching file patchlevel
patching file support/shobj-conf
patching file vi_mode.c
==> ./configure --prefix=/usr/local/Cellar/readline/6.2.4 --mandir=/usr/local/Ce
==> make install
==> Caveats
This formula is keg-only: so it was not symlinked into /usr/local.

OS X provides the BSD libedit library, which shadows libreadline.
In order to prevent conflicts when programs look for libreadline we are
defaulting this GNU Readline installation to keg-only.

Generally there are no consequences of this for you. If you build your
own software and it requires this formula, you'll need to add to your
build variables:

    LDFLAGS:  -L/usr/local/opt/readline/lib
    CPPFLAGS: -I/usr/local/opt/readline/include

==> Summary
??  /usr/local/Cellar/readline/6.2.4: 31 files, 1.6M, built in 34 seconds
==> Installing socat
==> Downloading http://www.dest-unreach.org/socat/download/socat-1.7.2.1.tar.bz2
######################################################################## 100.0%
tar: Failed to set default locale
==> Downloading patches
######################################################################## 100.0%
==> Patching
patching file xioexit.c
==> ./configure --prefix=/usr/local/Cellar/socat/1.7.2.1 --mandir=/usr/local/Cel
==> make install
  /usr/local/Cellar/socat/1.7.2.1: 8 files, 624K, built in 41 seconds

你看,自制软件完成编译并成功安装了socat.验证是否已启用SCTP

$socat -V
socat by Gerhard Rieger - see www.dest-unreach.org
socat version 1.7.2.1 on Mar 25 2013 08:43:00
   running on Darwin version Darwin Kernel Version 12.2.1: Thu Oct 18 12:13:47 PDT 2012; root:xnu-2050.20.9~1/RELEASE_X86_64, release 12.2.1, machine x86_64
features:
  #define WITH_STDIO 1
  #define WITH_FDNUM 1
  #define WITH_FILE 1
  #define WITH_CREAT 1
  #define WITH_GOPEN 1
  #define WITH_TERMIOS 1
  #define WITH_PIPE 1
  #define WITH_UNIX 1
  #undef WITH_ABSTRACT_UNIXSOCKET
  #define WITH_IP4 1
  #define WITH_IP6 1
  #define WITH_RAWIP 1
  #define WITH_GENERICSOCKET 1
  #undef WITH_INTERFACE
  #define WITH_TCP 1
  #define WITH_UDP 1
  #define WITH_SCTP 1
  #define WITH_LISTEN 1
  #define WITH_SOCKS4 1
  #define WITH_SOCKS4A 1
  #define WITH_PROXY 1
  #define WITH_SYSTEM 1
  #define WITH_EXEC 1
  #define WITH_READLINE 1
  #undef WITH_TUN
  #define WITH_PTY 1
  #define WITH_OPENSSL 1
  #undef WITH_FIPS
  #undef WITH_LIBWRAP
  #define WITH_SYCLS 1
  #define WITH_FILAN 1
  #define WITH_RETRY 1
  #define WITH_MSGLEVEL 0 /*debug*/

尝试简单的SCTP连接

$socat -  sctp4:my_server:19191
2013/03/25 08:45:46 socat[18838] E socket(2, 1, 132): Protocol not supported

它失败了.在socat主页上,它声明了OS X支持,但显然不是sctp.也许只有极少数人使用sctp,我在各处搜索了这个错误,但却找不到任何有用的东西.

我在Gentoo / Debian服务器上尝试了同样的事情,它们都运行良好,我只是无法在OS X下运行.我对OS X世界还不熟悉,有什么提示吗?

看起来OS X头文件知道SCTP协议,但库实际上并没有实现它.您可以使用第三方扩展来破解它.

我在OS X 10.8.3上获得相同的结果.安装socat时,它会在configure中检测SCTP支持并设置WITH_SCTP定义.

$./configure | grep -i sctp
configure: WARNING: include file netpacket/packet.h not found, disabling interface
checking whether to include SCTP support... yes
checking for IPPROTO_SCTP... yes

但是,如果您查看configure,这是一个非常简单的测试. “是否包括SCTP支持”是指定了–enable-sctp,默认情况下是否启用. “检查IPPROTO_SCTP”只是定义是否在头文件中定义了协议常量.也就是说,标头可以知道该协议并具有表示它的值,但底层系统可能无法实际使用.我认为就是这种情况:OS X内核不提供SCTP实现.

在较新版本的OS X:https://nplab.fh-muenster.de/groups/wiki/wiki/f366c/下,SCTP具有“初步”第三方支持.安装此功能使SCTP在homebrew的socat中为我工作.

[@ in ~]
$socat -d -d sctp-listen:99999 -
2013/04/24 22:19:38 socat[270] E socket(2, 1, 132): Protocol not supported
2013/04/24 22:19:38 socat[270] N exit(1)
[✘ @ in ~]
$sudo kextload /System/Library/Extensions/SCTP.kext
[✘ @ in ~]
$socat -d -d -d sctp-listen:99999 -
[...snip...]
2013/04/24 22:20:51 socat[291] I socket(2, 1, 132) -> 3
2013/04/24 22:20:51 socat[291] I starting accept loop
2013/04/24 22:20:51 socat[291] N listening on LEN=16 AF=2 0.0.0.0:34463

注意:这是第三方内核扩展,它是“初步的”,没有大量的文档,我不能保证来源.这可能很脆弱,也许很难从错误中恢复过来.我会在虚拟机中执行此操作,而不是在主机中执行此操作.虚拟机非常适合尝试低级别的东西和各种机器配置. (举个例子:弄清楚这个问题我做了一堆搞乱我的机器和一些有问题的东西作为root,然后,我将我的VM恢复为快照,它就像它从未发生过.)

另一种选择是查看libusrsctp中的“userland”(非内核)SCTP支持,可以在Homebrew中找到.这不会让socat与SCTP一起工作,但可能会支持你的其他业余爱好编程.

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