Add checksmtp functionality for SMTP configuration verification (#231)

bitwarden.sh

@@ -190,6 +190,57 @@ function compressLogs() {
     rm $tempfile
 }
 
+function checkSmtp() {
+    CONFIG_FILE="$1/env/global.override.env"
+
+    if [ ! -f "$CONFIG_FILE" ]; then
+        echo "Configuration file not found at $CONFIG_FILE"
+        exit 1
+    fi
+
+    if ! command -v openssl &> /dev/null; then
+        echo "OpenSSL is not available but is required for this check."
+        exit 1
+    fi
+
+    host=$(grep 'globalSettings__mail__smtp__host=' "$CONFIG_FILE" | cut -d '=' -f2)
+    port=$(grep 'globalSettings__mail__smtp__port=' "$CONFIG_FILE" | cut -d '=' -f2)
+    ssl=$(grep 'globalSettings__mail__smtp__ssl=' "$CONFIG_FILE" | cut -d '=' -f2)
+    username=$(grep 'globalSettings__mail__smtp__username=' "$CONFIG_FILE" | cut -d '=' -f2)
+    password=$(grep 'globalSettings__mail__smtp__password=' "$CONFIG_FILE" | cut -d '=' -f2)
+
+    if [ "$ssl" == "true" ]; then
+        ssl_command="-ssl"
+    else
+        ssl_command="-starttls smtp"
+    fi
+
+    set +e
+    SMTP_RESPONSE=$(
+        {
+            echo "EHLO localhost"
+            if [ "$ssl_command" != "-ssl" ]; then
+                echo "STARTTLS"
+                sleep 2
+                echo "EHLO localhost"
+            fi
+            # Check if username and password are set before proceeding
+            if [[ -n "$username" && -n "$password" ]]; then
+                echo "AUTH LOGIN"
+                echo "$(echo -ne "$username" | base64)"
+                echo "$(echo -ne "$password" | base64)"
+            fi
+            echo "QUIT"
+        } | openssl s_client -connect $host:$port $ssl_command -ign_eof 2>/dev/null
+    )
+
+    if echo "$SMTP_RESPONSE" | grep -q "^2[0-9][0-9] "; then
+        echo -e "SMTP settings are correct."
+    else
+        echo "SMTP authentication failed or connection error occurred."
+    fi
+}
+
 function listCommands() {
 cat << EOT
 Available commands:
@@ -267,6 +318,10 @@ case $1 in
         checkOutputDirExists
         compressLogs $OUTPUT $2 $3
         ;;
+    "checksmtp")
+        checkOutputDirExists
+        checkSmtp $OUTPUT
+        ;;
     "help")
         listCommands
         ;;