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This is a Go parser for ssh_config
files. Importantly, this parser attempts
to preserve comments in a given file, so you can manipulate a ssh_config
file
from a program, if your heart desires.
It's designed to be used with the excellent
x/crypto/ssh package, which handles SSH
negotiation but isn't very easy to configure.
The ssh_config
Get()
and GetStrict()
functions will attempt to read values
from $HOME/.ssh/config
and fall back to /etc/ssh/ssh_config
. The first
argument is the host name to match on, and the second argument is the key you
want to retrieve.
port := ssh_config.Get("myhost", "Port")
You can also load a config file and read values from it.
var config = `
Host *.test
Compression yes
`
cfg, err := ssh_config.Decode(strings.NewReader(config))
fmt.Println(cfg.Get("example.test", "Port"))
Some SSH arguments have default values - for example, the default value for
KeyboardAuthentication
is "yes"
. If you call Get(), and no value for the
given Host/keyword pair exists in the config, we'll return a default for the
keyword if one exists.
Here's how you can manipulate an SSH config file, and then write it back to
disk.
f, _ := os.Open(filepath.Join(os.Getenv("HOME"), ".ssh", "config"))
cfg, _ := ssh_config.Decode(f)
for _, host := range cfg.Hosts {
fmt.Println("patterns:", host.Patterns)
for _, node := range host.Nodes {
// Manipulate the nodes as you see fit, or use a type switch to
// distinguish between Empty, KV, and Include nodes.
fmt.Println(node.String())
}
}
// Print the config to stdout:
fmt.Println(cfg.String())
Wherever possible we try to implement the specification as documented in
the ssh_config
manpage. Unimplemented features should be present in the
issues list.
Notably, the Match
directive is currently unsupported.
This is the second comment-preserving configuration parser I've written, after
an /etc/hosts parser. Eventually, I will write one for every Linux
file format.
Donations free up time to make improvements to the library, and respond to
bug reports. You can send donations via Paypal's "Send Money" feature to
kev@inburke.com. Donations are not tax deductible in the USA.
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Thank you for your continuous support to the Openl Qizhi Community AI Collaboration Platform. In order to protect your usage rights and ensure network security, we updated the Openl Qizhi Community AI Collaboration Platform Usage Agreement in January 2024. The updated agreement specifies that users are prohibited from using intranet penetration tools. After you click "Agree and continue", you can continue to use our services. Thank you for your cooperation and understanding.
For more agreement content, please refer to the《Openl Qizhi Community AI Collaboration Platform Usage Agreement》