Add sshi(1)

1 files changed, 28 insertions, 0 deletions

diff --git a/bin/sshi b/bin/sshi
new file mode 100755
index 00000000..2f11a61d
--- /dev/null
+++ b/bin/sshi
@@ -0,0 +1,28 @@
+#!/bin/sh
+# Print some human-readable information from SSH_CONNECTION
+
+# Check we have an SSH_CONNECTION variable
+if [ -z "$SSH_CONNECTION" ] ; then
+    printf >&2 'sshi: SSH_CONNECTION appears empty\n'
+    exit 2
+fi
+
+# Print the two variables into a subshell so we can chop them up with read
+printf '%s\n' "$SSH_CONNECTION" "${SSH_TTY:-unknown}" | (
+
+    # Read connection details from first line
+    read -r ci cp si sp
+
+    # Read TTY from second line
+    read -r tty
+
+    # Try to resolve the client and server IPs
+    ch=$(dig -x "$ci" +short 2>/dev/null | sed 1q)
+    sh=$(dig -x "$si" +short 2>/dev/null | sed 1q)
+
+    # Print the results in a human-readable format
+    printf "%s:%u -> %s:%u (%s)\n" \
+        "${ch:-"$ci"}" "$cp" \
+        "${sh:-"$si"}" "$sp" \
+        "$tty"
+)