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Detect SSH port and set previous port for rollback

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buildplan
2025-10-17 20:11:42 +01:00
parent c85452bd73
commit 1edb75d271
1 changed files with 20 additions and 5 deletions
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25
du_setup.sh
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@@ -1328,10 +1328,13 @@ collect_config() {
if validate_hostname "$SERVER_NAME"; then break; else print_error "Invalid hostname."; fi
done
read -rp "$(printf '%s' "${CYAN}Enter a 'pretty' hostname (optional): ${NC}")" PRETTY_NAME
local INITIAL_DETECTED_PORT
INITIAL_DETECTED_PORT=$(ss -tlpn | grep sshd | grep -oP ':\K\d+' | head -n 1)
local PROMPT_DEFAULT_PORT=${INITIAL_DETECTED_PORT:-2222}
[[ -z "$PRETTY_NAME" ]] && PRETTY_NAME="$SERVER_NAME"
while true; do
read -rp "$(printf '%s' "${CYAN}Enter custom SSH port (1024-65535) [2222]: ${NC}")" SSH_PORT
SSH_PORT=${SSH_PORT:-2222}
read -rp "$(printf '%s' "${CYAN}Enter custom SSH port (1024-65535) [$PROMPT_DEFAULT_PORT]: ${NC}")" SSH_PORT
SSH_PORT=${SSH_PORT:-$PROMPT_DEFAULT_PORT}
if validate_port "$SSH_PORT"; then break; else print_error "Invalid port number."; fi
done
SERVER_IP_V4=$(curl -4 -s https://ifconfig.me 2>/dev/null || echo "unknown")
@@ -1345,7 +1348,13 @@ collect_config() {
printf '\n%s\n' "${YELLOW}Configuration Summary:${NC}"
printf " %-15s %s\n" "Username:" "$USERNAME"
printf " %-15s %s\n" "Hostname:" "$SERVER_NAME"
printf " %-15s %s\n" "SSH Port:" "$SSH_PORT"
if [[ -n "$INITIAL_DETECTED_PORT" && "$SSH_PORT" != "$INITIAL_DETECTED_PORT" ]]; then
printf " %-15s %s (changed from current: %s)\n" "SSH Port:" "$SSH_PORT" "$INITIAL_DETECTED_PORT"
else
printf " %-15s %s\n" "SSH Port:" "$SSH_PORT"
fi
if [[ "$SERVER_IP_V4" != "unknown" ]]; then
printf " %-15s %s\n" "Server IPv4:" "$SERVER_IP_V4"
fi
@@ -1686,8 +1695,14 @@ configure_ssh() {
SSHD_BACKUP_FILE="$BACKUP_DIR/sshd_config.backup_$(date +%Y%m%d_%H%M%S)"
cp /etc/ssh/sshd_config "$SSHD_BACKUP_FILE"
# Store the current active port as the previous port
PREVIOUS_SSH_PORT=$(ss -tuln | grep -E ":(22|.*$SSH_SERVICE.*)" | awk '{print $5}' | cut -d':' -f2 | head -n1 || echo "22")
# Store the current active port as the previous port for rollback purposes
PREVIOUS_SSH_PORT=$(ss -tlpn | grep sshd | grep -oP ':\K\d+' | head -n 1)
if [[ -z "$PREVIOUS_SSH_PORT" ]]; then
print_warning "Could not detect an active SSH port. Assuming port 22 for the initial test."
log "Could not detect active SSH port, fell back to 22."
PREVIOUS_SSH_PORT="22"
fi
CURRENT_SSH_PORT=$PREVIOUS_SSH_PORT
USER_HOME=$(getent passwd "$USERNAME" | cut -d: -f6)
SSH_DIR="$USER_HOME/.ssh"