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Efficiently test if a port is open on Linux?
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A surprise I found out recently is that Bash natively supports tcp connections as file descriptors. To use:
exec 6<>/dev/tcp/ip.addr.of.server/445
echo -e "GET / HTTP/1.0\n" >&6
cat <&6
I'm using 6 as the file descriptor because 0,1,2 are stdin, stdout, and stderr....
What ports does RabbitMQ use?
....0.0.1)
Host is up (0.00041s latency).
PORT STATE SERVICE
443/tcp open https
5672/tcp open amqp
15672/tcp open unknown
35102/tcp open unknown
59440/tcp open unknown
Oh look, 5672, and 15672
Use netstat:
netstat -lntu
Active Internet connections (only servers)...
2016电商“死亡”名单（上半年） - 资讯 - 清泛网 - 专注IT技能提升
...进行了反思：A轮融资后开始盲目扩张，大幅增员，大量使用猎头招聘所谓的行业“大牛”、顶尖技术人才，盲目相信某某大公司背景、相信所谓专业性人才和经验，盲目制定战略，在毫无供应链经验的时候，涉足供应链，大量...
What are named pipes?
...d default exists (much like port 80 for HTTP, SQL server uses port 1433 in TCP/IP; \\.\pipe\sql\query for a named pipe).
By setting up additional named pipes, you can have multiple DB servers running, each with its own request listeners.
The advantage of named pipes is that it is usually much fas...
Web安全测试之XSS - 更多技术 - 清泛网 - 专注C/C++及内核技术
...览器会阻止XSS。 例如下图
如果需要做测试， 最好使用IE7。
ASP.NET中的XSS安全机制
ASP.NET中有防范XSS的机制，对提交的表单会自动检查是否存在XSS，当用户试图输入XSS代码的时候，ASP.NET会抛出一个错误如下图
很多程序...
Command line for looking at specific port
... -np <protocol> | find "port #"
So for example to check port 80 on TCP, you can do this: netstat -np TCP | find "80"
Which ends up giving the following kind of output:
TCP 192.168.0.105:50466 64.34.119.101:80 ESTABLISHED
TCP 192.168.0.105:50496 64.34.119.101:80 ESTAB...
How many socket connections can a web server handle?
...edicated hosting, I read somewhere a server/machine can only handle 64,000 TCP connections at one time, is this true? How many could any type of hosting handle regardless of bandwidth? I'm assuming HTTP works over TCP.
...
LVN_ITEMCHANGED通知会响应多次的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
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为了CListCtrl能响应 单击选中事件 和 键盘上下键 事件，使用 ON_NOTIFY 的 LVN_ITEMCHANGED 事件似乎可以解决问题， 但是由于 LVN_ITEMCHANGED 能响应太多行为致使函数被多次触发(如: 由没选中到选中触发一次；由选中一行到选中另一行...
xpath路径表达式笔记 - C/C++ - 清泛网 - 专注C/C++及内核技术
...除了绝对路径以外的其他写法，比如 step/step，也就是不使用"/"起首。
# "."表示当前节点。
# ".."表示当前节点的父节点
二、选择节点的基本规则
- nodename（节点名称）：表示选择该节点的所有子节点
- "/"：表...
ON_COMMAND_EX、ON_COMMAND区别 - C/C++ - 清泛网 - 专注C/C++及内核技术
...对应的ON_NOTIFY_EX_RANGE
ON_COMMAND_RANGE对应的ON_COMMAND_EX_RANGE
使用这些宏的目的在于利用扩展宏的第二个功能：实现消息的多次处理。
ON_COMMAND_EX ON_COMMAND 区别