netstat | 易学教程

How to do like “netstat -p”, but faster?

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问题 Both "netstat -p" and "lsof -n -i -P" seems to readlinking all processes fd's, like stat /proc/*/fd/* . How to do it more efficiently? My program wants to know what process is connecting to it. Traversing all processes again and again seems too ineffective. Ways suggesting iptables things or kernel patches are welcome too. 回答1: Take a look at this answer, where various methods and programs that perform socket to process mappings are mentioned. You might also try several additional techniques

How to do like “netstat -p”, but faster?

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Getting routing table on MACOSX (programmatically)

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问题 The question is how can I get routing table on MACOSX? I don’t mean netstat -nr . I mean how to do it programmatically using C . The first of all I have downloaded netstat source codes from opensource.apple.com. I have found void mroutepr(void) function in mroute.c . This function looks like function which get routing table but I am not sure. There is a array declaration: struct vif viftable[CONFIG_MAXVIFS]; But when I tried to compile mroutepr I revealed that struct vif is not declared in

Linux 套接字编程中的 5 个隐患

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http://www.ibm.com/developerworks/cn/linux/l-sockpit/ 在 4.2 BSD UNIX® 操作系统中首次引入，Sockets API 现在是任何操作系统的标准特性。事实上，很难找到一种不支持 Sockets API 的现代语言。该 API 相当简单，但新的开发人员仍然会遇到一些常见的隐患。本文识别那些隐患并向您显示如何避开它们。隐患 1．忽略返回状态第一个隐患很明显，但它是开发新手最容易犯的一个错误。如果您忽略函数的返回状态，当它们失败或部分成功的时候，您也许会迷失。反过来，这可能传播错误，使定位问题的源头变得困难。捕获并检查每一个返回状态，而不是忽略它们。考虑清单 1 显示的例子，一个套接字 send 函数。清单 1. 忽略 API 函数返回状态 int status, sock, mode; /* Create a new stream (TCP) socket */ sock = socket( AF_INET, SOCK_STREAM, 0 ); ... status = send( sock, buffer, buflen, MSG_DONTWAIT ); if (status == -1) { /* send failed */ printf( "send failed: %s\n", strerror

Linux 套接字编程中的 5 个隐患

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Linux 套接字编程中的 5 个隐患 (2011-05-03 17:50) 分类： Socket编程在 4.2 BSD UNIX® 操作系统中首次引入，Sockets API 现在是任何操作系统的标准特性。事实上，很难找到一种不支持 Sockets API 的现代语言。该 API 相当简单，但新的开发人员仍然会遇到一些常见的隐患。本文识别那些隐患并向您显示如何避开它们。隐患 1．忽略返回状态第一个隐患很明显，但它是开发新手最容易犯的一个错误。如果您忽略函数的返回状态，当它们失败或部分成功的时候，您也许会迷失。反过来，这可能传播错误，使定位问题的源头变得困难。捕获并检查每一个返回状态，而不是忽略它们。考虑清单 1 显示的例子，一个套接字 send 函数。清单 1. 忽略 API 函数返回状态 int status, sock, mode;/* Create a new stream (TCP) socket */sock = socket( AF_INET, SOCK_STREAM, 0 );...status = send( sock, buffer, buflen, MSG_DONTWAIT );if (status == -1) { /* send failed */ printf( "send failed: %s\n", strerror(errno) )

Linux 套接字编程中的 5 个隐患

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转自:http://www.ibm.com/developerworks/cn/linux/l-sockpit/ 在 4.2 BSD UNIX® 操作系统中首次引入，Sockets API 现在是任何操作系统的标准特性。事实上，很难找到一种不支持 Sockets API 的现代语言。该 API 相当简单，但新的开发人员仍然会遇到一些常见的隐患。本文识别那些隐患并向您显示如何避开它们。隐患 1．忽略返回状态第一个隐患很明显，但它是开发新手最容易犯的一个错误。如果您忽略函数的返回状态，当它们失败或部分成功的时候，您也许会迷失。反过来，这可能传播错误，使定位问题的源头变得困难。捕获并检查每一个返回状态，而不是忽略它们。考虑清单 1 显示的例子，一个套接字 send 函数。清单 1. 忽略 API 函数返回状态 int status, sock, mode; /* Create a new stream (TCP) socket */ sock = socket( AF_INET, SOCK_STREAM, 0 ); ... status = send( sock, buffer, buflen, MSG_DONTWAIT ); if (status == -1) { /* send failed */ printf( "send failed: %s\n", strerror

TCP connection owned by pid zero

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问题 I'm trying to ensure that a Windows service program (running on top of .NET) is properly releasing its network connections. When running the service locally I know that it will create a lot of HTTP connections to localhost on port 57300. I'm using netstat to monitor whether they are released properly. I was suprised to see that many connections to this port are owned by the "System Idle process" (PID=0). Here we can see that only three of those connections are owned by the service program

常见实用的linux命令

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上传和下载 yum install -y lrzsz rz 上传 sz [filename] 下载增加别名 alias [newbash]=[oldbash] 如 alias lampp='/opt/lampp/lampp' alias命令增加的别名重启后会失效,使其永久有效办法在centos中编辑vim /root/.bashrc新增一行 alias lampp='/opt/lampp/lampp' 实时监控日志 tail -f [filename] tailf [filename] less [filename] 查看端口信息 netstat -ntulp netstat -ntulp |grep [port] 查看固定端口来源： CSDN 作者： Kdiy 链接： https://blog.csdn.net/a906904948/article/details/103586968

How do I access netstat data in Python?

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问题 I'm trying to need to access/parse all outgoing connections on a particular port number on a Linux machine using a Python script. The simplest implementation seems to be to open a subprocess for netstat and parse its stdout. I imagine someone somewhere has had this problem before, and am surprised not to find any netstat parsers online. Is this just not big enough of a problem for people to feel the need to share? 回答1: If you want to control the connection opened by a certain process you can

How to check if a network port is open on linux?

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问题 How can I know if a certain port is open/closed on linux ubuntu, not a remote system, using python? How can I list these open ports in python? Netstat: Is there a way to integrate netstat output with python? 回答1: You can using the socket module to simply check if a port is open or not. It would look something like this. import socket sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) result = sock.connect_ex(('127.0.0.1',80)) if result == 0: print "Port is open" else: print "Port is not

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