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27 lines
682 B
Bash
27 lines
682 B
Bash
#!/usr/bin/env sh
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# Sources:
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# - https://superuser.com/questions/621870/test-if-a-port-on-a-remote-system-is-reachable-without-telnet
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# TCP
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nc -vz -w '3' 'localhost' '80'
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nc -nvz -w '3' '127.0.0.1' '80'
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nc 'localhost' '22' -e true # busybox's nc
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timeout '3' cat < '/dev/tcp/localhost/80'
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timeout '3' cat < '/dev/tcp/127.0.0.1/80'
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curl -fsS -o '/dev/null' -w "%{http_code}" --connect-timeout '3' 'http://www.example.org/'
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curl -fksS -o '/dev/null' -w "%{http_code}" --connect-timeout '3' 'https://www.example.org/'
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# UDP
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nc -uvz -w '3' 'localhost' '25'
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nc -nuvz -w '3' '127.0.0.1' '25'
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timeout '3' cat < '/dev/udp/localhost/80'
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timeout '3' cat < '/dev/udp/127.0.0.1/25'
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