53 lines
1002 B
Bash
Executable File
53 lines
1002 B
Bash
Executable File
#!/bin/bash
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usage() {
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echo "Usage: $0 -i <IP checker service> -d <domain to resolve> -r <DNS server to query>"
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exit 3
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}
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IP_CHECKER=""
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DOMAIN=""
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DNS_SERVER=""
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while getopts "i:d:r:" opt; do
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case ${opt} in
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i )
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IP_CHECKER=$OPTARG
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;;
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d )
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DOMAIN=$OPTARG
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;;
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r )
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DNS_SERVER=$OPTARG
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;;
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\? )
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echo "Invalid option: $OPTARG" 1>&2
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usage
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exit 1
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;;
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: )
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echo "Invalid option: $OPTARG requires an argument" 1>&2
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usage
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exit 1
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;;
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esac
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done
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shift $((OPTIND -1))
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if [ -z "$IP_CHECKER" ] || [ -z "$DOMAIN" ] || [ -z "$DNS_SERVER" ]; then
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echo "All parameters are required"
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usage
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exit 1
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fi
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CURRENT_IP=$(curl -s "$IP_CHECKER")
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RESOLVED_IP=$(dig +short @$DNS_SERVER $DOMAIN | head -n 1)
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if [ "$CURRENT_IP" == "$RESOLVED_IP" ]; then
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echo "OK - $DOMAIN resolves to $CURRENT_IP"
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exit 0
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else
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echo "CRITICAL - $DOMAIN does not resolve to $CURRENT_IP. Resolved: $RESOLVED_IP"
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exit 2
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fi
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