Linux 我可以在不使用 system() 命令的情况下用 C 读/写路由表吗？
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can I read/write the routing table in C without using system() command?
提问by cateof
I have code written in C. I want to get using C code information that is stored in routing table. Is it possible?
我有用 C 编写的代码。我想使用存储在路由表中的 C 代码信息。是否可以？
采纳答案by Keith
You can open a netlink socket and send route update messages. There is an articleabout how to do this.
回答by Nemo
You can also run "strace route add ..." to see how the routecommand does it.
您还可以运行“strace route add ...”来查看route命令是如何执行的。
On my system, it uses ioctlwith SIOCADDRT. A little searching turns up some sample code.
在我的系统上，它ioctl与SIOCADDRT. 稍微搜索一下就会出现一些示例代码。
Oddly, the best documentation I have found is from IBM's AS400 man pages.
奇怪的是，我找到的最好的文档来自IBM 的 AS400 手册页。
If you just want to read the routing table, you can open and read /proc/net/route. (Again, straceshows that this is how the routecommand does it.) The hex numbers are 32-bit IP addresses in machine-endian form. Try cat /proc/net/route.
如果只想读取路由表，可以打开读取/proc/net/route。（再次strace表明route命令就是这样做的。）十六进制数是机器端格式的 32 位 IP 地址。试试cat /proc/net/route。
回答by Jones
If you want to query the routing table only, try to read the file /proc/net/route. It works in my system.
如果只想查询路由表，请尝试读取文件/proc/net/route。它适用于我的系统。
