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138 lines
6.1 KiB
Fish
138 lines
6.1 KiB
Fish
function __fish_print_hostnames -d "Print a list of known hostnames"
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# This function used to primarily query `getent hosts` and only read from `/etc/hosts` if
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# `getent` did not exist or `getent hosts` failed, based off the (documented) assumption that
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# the former *might* return more hosts than the latter, which has never been officially noted
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# to be the case. As `getent` is several times slower, involves shelling out, and is not
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# available on some platforms (Cygwin and at least some versions of macOS, such as 10.10), that
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# order is now reversed and `getent hosts` is only used if the hosts file is not found at
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# `/etc/hosts` for portability reasons.
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begin
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test -r /etc/hosts && read -z </etc/hosts
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or type -q getent && getent hosts 2>/dev/null
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end |
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# Ignore comments, own IP addresses (127.*, 0.0[.0[.0]], ::1), non-host IPs (fe00::*, ff00::*),
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# and leading/trailing whitespace. Split results on whitespace to handle multiple aliases for
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# one IP.
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string replace -irf '^\s*?(?!(?:#|0\.|127\.|ff0|fe0|::1))\S+\s*(.*?)\s*$' '$1' |
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string split ' '
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# Print nfs servers from /etc/fstab
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if test -r /etc/fstab
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string match -r '^\s*[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3]:|^[a-zA-Z\.]*:' </etc/fstab |
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string replace -r ':.*' ''
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end
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# Check hosts known to ssh.
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# Yes, seriously - the default specifies both with and without "2".
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# Termux puts these in the android data directory if not rooted.
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# The directory is available as $PREFIX/etc, but that variable name is so generic that
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# it would cause false-positives.
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# Also, some people might use /usr/local/etc.
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set -l known_hosts ~/.ssh/known_hosts{,2} \
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{/data/data/com.termux/files/usr,/usr/local,}/etc/ssh/{,ssh_}known_hosts{,2}
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# Check default ssh configs.
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set -l ssh_config ~/.ssh/config
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# Inherit settings and parameters from `ssh` aliases, if any
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if functions -q ssh
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# Get alias and commandline options.
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set -l ssh_func_tokens (functions ssh | string match '*command ssh *' | string split ' ')
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set -l ssh_command $ssh_func_tokens (commandline -cpo)
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# Extract ssh config path from last -F short option.
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if contains -- -F $ssh_command
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set -l ssh_config_path_is_next 1
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for token in $ssh_command
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if contains -- -F $token
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set ssh_config_path_is_next 0
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else if test $ssh_config_path_is_next -eq 0
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set ssh_config (eval "echo $token")
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set ssh_config_path_is_next 1
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end
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end
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end
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end
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# Extract ssh config paths from Include option
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function _ssh_include --argument-names ssh_config
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# Relative paths in Include directive use /etc/ssh or ~/.ssh depending on
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# system or user level config. -F will not override this behaviour
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set -l relative_path $HOME/.ssh
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if string match '/etc/ssh/*' -- $ssh_config
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set relative_path /etc/ssh
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end
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function _recursive --no-scope-shadowing
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set -l paths
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for config in $argv
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if test -r "$config" -a -f "$config"
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set paths $paths (
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# Keep only Include lines and remove Include syntax
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string replace -rfi '^\s*Include\s+' '' <$config \
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# Normalize whitespace
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| string trim | string replace -r -a '\s+' ' ')
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end
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end
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set -l new_paths
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for path in $paths
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set -l expanded_path
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# Scope "relative" paths in accordance to ssh path resolution
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if string match -qrv '^[~/]' $path
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set path $relative_path/$path
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end
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# Use `eval` to expand paths (eg ~/.ssh/../test/* to /home/<user>/test/file1 /home/<user>/test/file2),
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# and `set` will prevent "No matches for wildcard" messages
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eval set expanded_path $path
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for path in $expanded_path
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# Skip unusable paths.
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test -r "$path" -a -f "$path"
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or continue
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echo $path
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set new_paths $new_paths $path
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end
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end
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if test -n "$new_paths"
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_recursive $new_paths
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end
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end
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_recursive $ssh_config
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end
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set -l ssh_configs /etc/ssh/ssh_config (_ssh_include /etc/ssh/ssh_config) $ssh_config (_ssh_include $ssh_config)
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for file in $ssh_configs
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if test -r $file
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# Don't read from $file twice. We could use `while read` instead, but that is extremely
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# slow.
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read -alz -d \n contents <$file
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# Print hosts from system wide ssh configuration file
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# Multiple names for a single host can be given separated by spaces, so just split it explicitly (#6698).
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string replace -rfi '^\s*Host\s+(\S.*?)\s*$' '$1' -- $contents | string split " " | string match -rv '[\*\?]'
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# Also extract known_host paths.
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set known_hosts $known_hosts (string replace -rfi '.*KnownHostsFile\s*' '' -- $contents)
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end
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end
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# Read all files and operate on their combined content
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for file in $known_hosts
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if test -r $file
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read -z <$file
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end
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end |
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# Ignore hosts that are hashed, commented or @-marked and strip the key
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# Handle multiple comma-separated hostnames sharing a key, too.
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#
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# This one regex does everything we need, finding all matches including comma-separated
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# values, but fish does not let us print only a capturing group without the entire match,
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# and we can't use `string replace` instead (because CSV then fails).
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# string match -ar "(?:^|,)(?![@|*!])\[?([^ ,:\]]+)\]?"
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#
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# Instead, manually piece together the regular expressions
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string match -v -r '^\s*[!*|@#]' | string replace -rf '^\s*(\S+) .*' '$1' |
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string split ',' | string replace -r '\[?([^\]]+).*' '$1'
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return 0
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end
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