select which transport to use by default

ssh-notify/ssh-notify.sh

@@ -91,9 +91,47 @@ else
     exit 1
 fi
 
-# Ensure required config variables are set
-if [[ -z "$EMAIL_RECIPIENT" || -z "$EMAIL_API_ENDPOINT" || -z "$TELEGRAM_BOT_TOKEN" || -z "$TELEGRAM_CHAT_ID" || -z "$LOG_FILE" ]]; then
-    ERR_MSG="ssh-notify Error: One or more required variables are missing in $CONFIG_FILE."
+# Set default for PAM_TRANSPORTS if not specified
+if [[ -z "$PAM_TRANSPORTS" ]]; then
+    PAM_TRANSPORTS="telegram email"
+fi
+
+# Validate and parse PAM_TRANSPORTS
+ENABLE_EMAIL=false
+ENABLE_TELEGRAM=false
+for transport in $PAM_TRANSPORTS; do
+    case "$transport" in
+        email)
+            ENABLE_EMAIL=true
+            ;;
+        telegram)
+            ENABLE_TELEGRAM=true
+            ;;
+        *)
+            ERR_MSG="ssh-notify Warning: Unknown transport '$transport' in PAM_TRANSPORTS. Valid options: email, telegram"
+            echo "$ERR_MSG" | systemd-cat -p warning -t 'ssh-notify'
+            echo "$ERR_MSG" >&2
+            ;;
+    esac
+done
+
+# Ensure required config variables are set based on enabled transports
+if [[ "$ENABLE_EMAIL" == true && ( -z "$EMAIL_RECIPIENT" || -z "$EMAIL_API_ENDPOINT" ) ]]; then
+    ERR_MSG="ssh-notify Error: Email transport enabled but EMAIL_RECIPIENT or EMAIL_API_ENDPOINT missing in $CONFIG_FILE."
+    echo "$ERR_MSG" | systemd-cat -p err -t 'ssh-notify'
+    echo "$ERR_MSG" >&2
+    exit 1
+fi
+
+if [[ "$ENABLE_TELEGRAM" == true && ( -z "$TELEGRAM_BOT_TOKEN" || -z "$TELEGRAM_CHAT_ID" ) ]]; then
+    ERR_MSG="ssh-notify Error: Telegram transport enabled but TELEGRAM_BOT_TOKEN or TELEGRAM_CHAT_ID missing in $CONFIG_FILE."
+    echo "$ERR_MSG" | systemd-cat -p err -t 'ssh-notify'
+    echo "$ERR_MSG" >&2
+    exit 1
+fi
+
+if [[ -z "$LOG_FILE" ]]; then
+    ERR_MSG="ssh-notify Error: LOG_FILE missing in $CONFIG_FILE."
     echo "$ERR_MSG" | systemd-cat -p err -t 'ssh-notify'
     echo "$ERR_MSG" >&2
     exit 1
@@ -162,8 +200,8 @@ send_telegram() {
         [[ "$TEST_TYPE" == "both" || "$TEST_TYPE" == "email" ]] && send_email
         [[ "$TEST_TYPE" == "both" || "$TEST_TYPE" == "telegram" ]] && send_telegram
     else
-        send_email
-        send_telegram
+        [[ "$ENABLE_EMAIL" == true ]] && send_email
+        [[ "$ENABLE_TELEGRAM" == true ]] && send_telegram
     fi
 ) &