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iptables常用的防御功能实例

醉酒当歌 提交于 2020-04-25 13:23:23
一、使用 connlimit 模块, 控制 并发访问(CC / DOS )量: iptables -I INPUT -p tcp --dport 80 -m connlimit --connlimit-above 10 -j LOG --log-prefix "WEB Attack" 示例配置 如下: *filter -A INPUT -p tcp --dport 80 -m connlimit --connlimit-above 10 -j LOG --log-prefix "WEB Attack" -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -p tcp --dport 22 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT 结果 图: 效果图: sudo

spring学习3-Ioc和DI的简单介绍

孤街醉人 提交于 2020-03-04 22:21:27
控制反转(Inversion of Control,英文缩写为IoC)是一个重要的 面向对象编程 的法则来削减计算机程序的耦合问题,也是轻量级的Spring框架的核心。 控制反转还有一个名字叫做依赖注入(Dependency Injection)。简称 DI 。 以上是来自于百度百科中关于IOC和DI的简单介绍,从中我们可以看到ioc的主要作用是减少类与类之间的耦合程度,在spring中,ioc的表现为类的实例化由原本程序员自己创建对象的动作转为由spring容器创建对象。 在不使用IOC的情况下,我们实例化一个类 IEngine engine = new QiyouEngine(); 在这个语句中我们用到了IEngine接口和其实现类QiyouEngine,这样这个类就需要引用这两个类,如果需要改动实现类,则需要修改代码,这就违反了面向对象设计中的”开闭原则“。想要解耦这段代码,一般的解决可以使用工厂模式对其解耦 1 public class Main{ 2 public static void main(String args[]){ 3 IEngine engine = EngineFactory.getEngine(); 4 engine.doSomething(); 5 } 6 } 7 8 9 public class EngineFactory{ 10 public

C comparing char to “\n” warning: comparison between pointer and integer

╄→гoц情女王★ 提交于 2020-01-20 08:10:55
问题 I have the following part of C code: char c; int n = 0; while ( (c = getchar()) != EOF ){ if (c == "\n"){ n++; } } during compilation, compiler tells me warning: comparison between pointer and integer [enabled by default] The thing is that if to substitute "\n" with '\n' there are no warnings at all. Can anyone explain me the reason? Another strange thing is that I am not using pointers at all. I am aware of the following questions warning: comparison between pointer and integer [enabled by

pandas入门: 数据选择

断了今生、忘了曾经 提交于 2020-01-10 02:34:14
关于pandas数据选择的知识点总结。 首先,创建一个dataframe df = pd.DataFrame({'A': [3, 4, 8, 9], 'B': [1.2, 2.4, 4.5, 7.3], 'C': ["aa", "bb", "cc", "dd"]}) 创建的dataframe信息如下: A B C 0 3 1.2 aa 1 4 2.4 bb 2 8 4.5 cc 3 9 7.3 dd 选择一列 df1 = df['A'] # 根据列名选取一列,以Series的形式返回列 df1 = df.A # 与上面写法效果相同 结果如下: 0 3 1 4 2 8 3 9 根据列名的列表选择多列 df1 = df[['A', 'B']] 结果如下: A B 0 3 1.2 1 4 2.4 2 8 4.5 3 9 7.3 选择前n行 df[0:2] # 选择前三行 结果如下: A B C 0 3 1.2 aa 1 4 2.4 bb 选择某一行 df.iloc[0,:] # 选择第一行 结果如下: A 3 B 1.2 C aa Name: 0, dtype: object 选择某行某列的元素 df.iloc[0, 0] # 选择第一行第一列的元素 结果如下: 3 在多个轴上选择数据 df.loc[:, ['B', 'C']] # 选择B C列的所有行 print("=========

Make error: I want the make file to use gcc compiler flags but originally it uses intel

天大地大妈咪最大 提交于 2020-01-06 20:58:11
问题 I also tried make -icpc="CXX" make -icc="cc" gives the error. make: invalid option -- 'c' make: invalid option -- 'c' make: invalid option -- '=' make: invalid option -- 'c' make: invalid option -- 'c' Currently Loaded Module files: gcc make python/2.7.11 openmpi/1.10.1-gnu hdf5/1.8.10-intel boost/1.60.0-gnu5 mkl/2013.5.192 mpich/3.1.2-gnu 来源: https://stackoverflow.com/questions/43528646/make-error-i-want-the-make-file-to-use-gcc-compiler-flags-but-originally-it-use

Modifying a makefile to compile .cc and .cpp files

独自空忆成欢 提交于 2020-01-06 03:18:41
问题 I am trying to modify my makefile to support .cpp and .cc, however, I keep getting an error such as target `source/systemFuncs.cpp' doesn't match the target pattern I am modifying an existing makefile that support .cc and I want to make it also compile .cpp, but I am unsure how. This was originally a make file for a nacl project. How can I compile both .cpp and .cc? Related content to the makefile: x86_32_OBJS:=$(patsubst %.cc,%_32.o,$(CXX_SOURCES)) $(x86_32_OBJS) : %_32.o : %.cc $(THIS_MAKE)

How to get CMake to use the default compiler on system PATH?

拜拜、爱过 提交于 2020-01-03 16:46:20
问题 There is the same question and the answer. The problem is that the answer seems to be wrong (actually is not the answer to the asked question). Can I re-ask the question? The problem: $ echo $PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games $ whereis gcc cc: /usr/bin/gcc /usr/lib/gcc /usr/local/bin/gcc /usr/libexec/gcc $ which gcc /usr/local/bin/gcc $ /usr/bin/gcc -v gcc version 4.1.2 $ /usr/local/bin/gcc -v gcc version 4.8.4 $ gcc -v gcc version 4

Woocommerce: Adding second email address not working, unless recipient is admin

China☆狼群 提交于 2019-12-31 06:58:07
问题 I have tried several methods to add additional recipients to Woocommerce emails, but it only seems to work on test orders where the primary recipient is the admin. These are the snippets I've tried. If the customer for the order is the admin, the email is sent both addresses. If the order contains a customer email address, it is only send to that email address and not the CC. Here are the code snippets I've tried: add_filter( 'woocommerce_email_recipient_customer_processing_order', 'my_email

Undefined reference to 'pow' even though -lm is a compile flag. [C]

让人想犯罪 __ 提交于 2019-12-28 23:48:05
问题 Any reason cc -g -lm -DBLITZ_HOST_IS_LITTLE_ENDIAN would produce an error with code using math.h ? Is it possible there's a difference between GCC version 4.0.3 (documented working version) and version 4.6.3 (my current version)? makefile and asm.c @ https://gist.github.com/3801291 This is on ubuntu 12.04 My terminal output is a comment in the gist. 回答1: Instead of cc -g -lm -DBLITZ_HOST_IS_LITTLE_ENDIAN foo.c Try: cc -g -DBLITZ_HOST_IS_LITTLE_ENDIAN foo.c -lm When the linker searches a

Why cc cannot find lgomp while gcc can

旧街凉风 提交于 2019-12-25 05:25:29
问题 on Mac OS X 10.7 I run this command on this file http://www.imagemagick.org/source/wand.c as they said here http://www.imagemagick.org/script/magick-wand.php cc -o wand `pkg-config --cflags --libs MagickWand` wand.c An error occurred: ld: library not found for -lgomp clang: error: linker command failed with exit code 1 (use -v to see invocation) But gcc works fine: gcc -o wand `pkg-config --cflags --libs MagickWand` wand.c Why was that? I want to know what different between gcc and cc on this