35 lines
1.2 KiB
Bash
Executable File
35 lines
1.2 KiB
Bash
Executable File
#!/bin/bash
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# identify-hosts.sh — identify all live hosts on a network via DNS/SNMP/SSH
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# Usage: bash identify-hosts.sh <hosts-file-or-subnet>
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# bash identify-hosts.sh 192.168.0.0/22
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# bash identify-hosts.sh /tmp/live-hosts.txt
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set -u
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COMMUNITY="${SNMP_COMMUNITY:-kn3lmgmt}"
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if [ -f "${1:-}" ]; then
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HOSTS=$(cat "$1")
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elif [ -n "${1:-}" ]; then
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HOSTS=$(nmap -sn -n "$1" 2>/dev/null | grep 'Nmap scan report' | awk '{print $5}')
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else
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echo "Usage: $0 <hosts-file-or-subnet>"
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exit 1
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fi
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printf "%-16s %-30s %-25s %-20s\n" "IP" "DNS_NAME" "SNMP_SYSDESCR" "SSH_BANNER"
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printf "%-16s %-30s %-25s %-20s\n" "--" "-------" "-------------" "----------"
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for ip in $HOSTS; do
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# DNS reverse
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rdns=$(dig +short -x "$ip" 2>/dev/null | head -1 | sed 's/\.$//')
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[ -z "$rdns" ] && rdns="(no-ptr)"
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# SNMP sysDescr (first 25 chars)
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snmp=$(timeout 3 snmpget -Oqv -v2c -c "$COMMUNITY" "$ip" 1.3.6.1.2.1.1.1.0 2>/dev/null | head -1 | tr -d '"' | cut -c1-25)
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[ -z "$snmp" ] && snmp="-"
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# SSH banner (quick)
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ssh_banner=$(timeout 3 bash -c "echo > /dev/tcp/$ip/22" 2>/dev/null && echo "ssh:open" || echo "-")
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printf "%-16s %-30s %-25s %-20s\n" "$ip" "$rdns" "$snmp" "$ssh_banner"
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done
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