smtp-check

scripts/smtp-check

@@ -0,0 +1,63 @@
+#!/bin/bash
+
+function usage {
+    echo 'usage: <SERVER> [USERNAME PASSWORD]'
+    exit 1
+}
+
+function connect_server {
+    openssl s_client -starttls smtp -connect "$server:587" -ign_eof 2>/dev/null <<EOF
+quit
+EOF
+}
+
+function auth_server {
+    base64=$(echo -ne "\0$username\0$password" | base64)
+    openssl s_client -starttls smtp -connect "$server:587" -ign_eof 2>/dev/null <<EOF
+ehlo .
+auth plain $base64
+quit
+EOF
+}
+
+function check_smtp_connection {
+    echo -n "check smtp server <$server> port 587 ... "
+    if connect_server | grep -q CONNECTED; then
+        echo SUCCESS
+    else
+        echo FAILURE && exit 1
+    fi
+}
+
+function check_smtp_auth {
+    echo -n "check smtp authentication <$server> port 587 username=<$username> ... "
+    set +e
+    output=$(auth_server)
+    if echo "$output" | grep -q CONNECTED; then
+        if echo "$output" | grep -q "Authentication successful"; then
+            echo OK
+        else
+            echo wrong username or password! && exit 2
+        fi
+    else
+        echo wrong server connection! && exit 1
+    fi
+    set -e
+}
+
+### MAIN
+
+set -Eeuo pipefail
+
+server=${1:-}
+username=${2:-}
+password=${3:-}
+
+[[ -z "$server" ]] && usage
+
+if [[ -z "$username" ]]; then
+    check_smtp_connection
+else
+    [[ -z "$password" ]] && usage
+    check_smtp_auth
+fi