blocks|key|5530114|text|正如我在ltrace-ing+iptables+-L的评论中所说的那样，我发现我的Debian/Sid上有一个包含libipq和相关库的iptables-dev包。您可能想要使用它。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5530115|entityMap|0|LINK|mutability|MUTABLE|url|http://linux.die.net/man/3/libipq^0|4|6|F|B|1W|C|1L|6|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@$9|U|A|V|1|W]]|E|$]]|$1|F|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

As I said in a comment, by <code>ltrace</code>-ing <code>iptables -L</code>, I fould that there is an <code>iptables-dev</code> package on my Debian/Sid with <a href="http://linux.die.net/man/3/libipq" rel="nofollow">libipq</a> and related libraries. You probably might want to use it.

blocks|key|3914946|text|我将使用/+proc+/net/下的proc-fileystem查看http://www.netfilter.org/documentation/FAQ/netfilter-faq-3.html#ss3.9并查找proc(在不同的问题中)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3914947|entityMap|0|LINK|mutability|MUTABLE|url|http://www.netfilter.org/documentation/FAQ/netfilter-faq-3.html#ss3.9^0|Y|1X|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I would use the proc-fileystem under /proc/net/
Have a look at <a href="http://www.netfilter.org/documentation/FAQ/netfilter-faq-3.html#ss3.9" rel="nofollow">http://www.netfilter.org/documentation/FAQ/netfilter-faq-3.html#ss3.9</a> and look for proc (in different questions)

blocks|key|3914995|text|嗯，为什么他不研究iptables的来源来获得一个想法呢？如果源代码只包含所需的代码，我不明白为什么要使用strace来解决这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3914996|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Hm why shouln't he look into the sources of iptables to get an idea? I can not see why one would use strace to figure it out if the sources just contains the needed code.

blocks|key|1189011|text|所以它看起来没有任何方法，并且已经被Netfilter小组确认了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1189012|请参阅SO问题，How+can+I+programmatically+manage+iptables+rules+on+the+fly?|offset|length|1189013|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/109553/how-can-i-programatically-manage-iptables-rules-on-the-fly^0|0|8|1O|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

So it looks like there isn't any way and it's been acknowledged by Netfilter group. 

See SO question, <a href="https://stackoverflow.com/questions/109553/how-can-i-programatically-manage-iptables-rules-on-the-fly">How can I programmatically manage iptables rules on the fly?</a>

blocks|key|1186349|text|您可以与名为libiptc.的iptables库进行交互|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|1186350|这就是我如何创建到iptables的Perl接口：CPAN+IPTables::libiptc|1186351|但是libiptc库只为您提供了一个基本链结构的应用编程接口。访问和解析各个规则要复杂一些，因为它依赖于dyn-loading各个目标/匹配模块的共享库。|1186352|在我的CPAN+module中，我的方法是从iptables.c链接到do_command()，以进行规则更改。|1186353|你需要知道的另一件事是：|1186354|单个iptables调用执行以下操作：|1186355|libiptc将整个规则集从内核复制到userspace|1186356|Parse，然后进行一次或多次更改(通常只需通过iptables将其更改为内核|unordered-list-item|1186357|
|1186358|格式，通过libiptc|1186359|1186360|将整个(新)规则集从用户空间复制到内核。|1186361|1186362|因此，如果您每次只做一次更改，那么这将是一个繁重的过程。但您也可以利用这一点，一次执行许多更改，并让这些更改显示为内核的单个原子更改。|1186363|entityMap|0|LINK|mutability|MUTABLE|url|http://search.cpan.org/perldoc?IPTables::libiptc|1^0|6|7|6|7|F|8|0|9|8|P|M|0|0|2|7|1G|B|0|M|A|Z|C|3|B|1|0|0|B|0|2|8|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1E|8|@$9|1F|A|1G|B|C]|$9|1H|A|1I|B|D]|$9|1J|A|1K|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|1L|8|@$9|1M|A|1N|B|D]]|E|@$9|1O|A|1P|1|1Q]]|F|$]]|$1|I|3|J|5|6|7|1R|8|@$9|1S|A|1T|B|D]|$9|1U|A|1V|B|D]]|E|@]|F|$]]|$1|K|3|L|5|6|7|1W|8|@$9|1X|A|1Y|B|D]|$9|1Z|A|20|B|D]]|E|@$9|21|A|22|1|23]]|F|$]]|$1|M|3|N|5|6|7|24|8|@$9|25|A|26|B|C]]|E|@]|F|$]]|$1|O|3|P|5|6|7|27|8|@$9|28|A|29|B|D]]|E|@]|F|$]]|$1|Q|3|R|5|6|7|2A|8|@]|E|@]|F|$]]|$1|S|3|T|5|U|7|2B|8|@]|E|@]|F|$]]|$1|V|3|W|5|6|7|2C|8|@]|E|@]|F|$]]|$1|X|3|Y|5|U|7|2D|8|@]|E|@]|F|$]]|$1|Z|3|W|5|6|7|2E|8|@]|E|@]|F|$]]|$1|10|3|11|5|U|7|2F|8|@]|E|@]|F|$]]|$1|12|3|-4|5|6|7|2G|8|@]|E|@]|F|$]]|$1|13|3|14|5|6|7|2H|8|@]|E|@]|F|$]]|$1|15|3|-4|5|6|7|2I|8|@]|E|@]|F|$]]]|16|$17|$5|18|19|1A|F|$1B|1C]]|1D|$5|18|19|1A|F|$1B|1C]]]]

You can interface with the <code>iptables</code> library called <code>libiptc</code>.

That's how I have created my Perl interface to <code>iptables</code>: <a href="http://search.cpan.org/perldoc?IPTables::libiptc" rel="nofollow noreferrer">CPAN IPTables::libiptc</a>

But the <code>libiptc</code> library only gives you an API to the basic chain structures.
Accessing and parsing the individual rules is a bit more complicated, as it depends on <code>dyn-loading</code> the shared libs of the individual target/match modules.

My approach in my <a href="http://search.cpan.org/perldoc?IPTables::libiptc" rel="nofollow noreferrer">CPAN module</a> is that I have linked with <code>do_command()</code> from <code>iptables.c</code>, for doing rule changes.

Another thing you need to know is: 

That a single <code>iptables</code> call, perform these actions:

<ol>
<li>Copy the entire ruleset from the kernel to userspace</li>
<li>Parse it with <code>libiptc</code></li>
<li>Perform one or several changes (usually just one change via iptables cmd)</li>
<li>Transform it to kernel blob format, by libiptc</li>
<li>Copy the entire (new) ruleset from userspace to kernel.</li>
</ol>

Thus, a heavy process, if you only make a single change each time.
But you can also use this to your advantage, and perform many changes at once, and have these appear as a single atomic change, by/for the kernel.

Is there a way we can query iptables programmatically without making use of shell script? I don't have liberty of using shell script to run iptables command and grep output. Is there a native (API) level access to iptables using GNU C? At the bare minimum I would like to query default policy of iptables. 

I was hoping to use /proc file system but I don't think its <a href="http://www.lowth.com/rope/ProcFileSystem" rel="nofollow">implemented yet.</a>

How to programmatically access iptables?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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有没有一种方法可以不用shell脚本就能以编程方式查询iptables？我没有使用shell脚本运行iptables命令和grep输出的权限。是否存在对使用GNU C的iptables的本机(API)级别访问？至少我想查询iptables的默认策略。我希望使用/proc文件系统，但我不认为它是

问如何以编程方式访问iptables？
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问如何以编程方式访问iptables？EN