ip_summary.sh

#!/bin/bash

# Colors
BOLD="\033[1m"
BLUE="\033[1;34m"
CYAN="\033[1;36m"
YELLOW="\033[1;33m"
MAGENTA="\033[1;35m"
WHITE="\033[1;37m"
DARKRED="\033[0;31m"
NC="\033[0m"

# ─────────────────────────────────────────────
echo -e "${BOLD}${BLUE}SYSTEM INFO${NC}"

echo -e "${CYAN}Hostname:     ${YELLOW}$(hostname)${NC}"
echo -e "${CYAN}FQDN:         ${YELLOW}$(hostname -f)${NC}"

default_gw=$(ip route | awk '/^default/ {print $3; exit}')
[[ -n "$default_gw" ]] && echo -e "${CYAN}Default GW:   ${YELLOW}$default_gw${NC}"

# ─────────────────────────────────────────────
echo -e "\n${BOLD}${BLUE}NAME SERVICES${NC}"

found=0
for svc in \
    systemd-resolved dnsmasq nscd named \
    unbound pdns-recursor dnscrypt-proxy coredns avahi-daemon; do

    if systemctl is-active --quiet "$svc"; then
        echo -e "${CYAN}Service:      ${YELLOW}$svc${NC}"
        found=1
    fi
done

[[ $found -eq 0 ]] && echo -e "${CYAN}Service:      ${YELLOW}<none active>${NC}"

# ─────────────────────────────────────────────
echo -e "\n${BOLD}${BLUE}DNS SERVERS${NC}"

if command -v resolvectl >/dev/null 2>&1; then
    resolvectl dns | tail -n +2 | awk '{print "  \033[1;36mDNS:\033[0m \033[1;33m" $2 "\033[0m"}'
else
    grep '^nameserver' /etc/resolv.conf | awk '{print "  \033[1;36mDNS:\033[0m \033[1;33m" $2 "\033[0m"}'
fi

# ─────────────────────────────────────────────
echo -e "\n${BOLD}${BLUE}INTERFACES${NC}"

# Build associative array of MAC addresses
declare -A macs
while IFS= read -r line; do
    ifname=$(echo "$line" | awk -F: '{print $2}' | xargs)
    mac=$(echo "$line" | grep -oP 'link/\w+ \K([0-9a-f]{2}:){5}[0-9a-f]{2}')
    [[ -n "$ifname" && -n "$mac" ]] && macs["$ifname"]="$mac"
done < <(ip -o link)

# Show interface info
ip -brief address | while read -r line; do
    iface=$(echo "$line" | awk '{print $1}')
    state=$(echo "$line" | awk '{print $2}')
    addrs=$(echo "$line" | cut -d' ' -f3-)

    ipv4=$(echo "$addrs" | grep -oP '\d+\.\d+\.\d+\.\d+/\d+' | head -n1)
    ipv6=$(echo "$addrs" | grep -oP '([a-fA-F0-9:]+:+)+[a-fA-F0-9]*/\d+' | head -n1)
    mac="${macs[$iface]}"

    if [[ -n "$mac" ]]; then
        echo -e "${CYAN}Interface:    ${YELLOW}$iface ${WHITE}[$mac]${NC}"
    else
        echo -e "${CYAN}Interface:    ${YELLOW}$iface${NC}"
    fi

    if [[ "$state" == "DOWN" ]]; then
        echo -e "${CYAN}  Status:     ${DARKRED}DOWN${NC}"
        continue
    fi

    [[ -n "$ipv4" ]] && echo -e "${CYAN}  IPv4:       ${YELLOW}$ipv4${NC}"
    [[ -n "$ipv6" ]] && echo -e "${CYAN}  IPv6:       ${MAGENTA}$ipv6${NC}"
done