58 lines
2.4 KiB
Bash
58 lines
2.4 KiB
Bash
# Install the 'host', 'sed', and and 'nc' tools. This script is run before
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# the rest of the system setup so we may not yet have things installed.
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apt_get_quiet install bind9-host sed netcat-openbsd
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# Stop if the PRIMARY_HOSTNAME is listed in the Spamhaus Domain Block List.
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# The user might have chosen a name that was previously in use by a spammer
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# and will not be able to reliably send mail. Do this after any automatic
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# choices made above.
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if host $PRIMARY_HOSTNAME.dbl.spamhaus.org > /dev/null; then
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echo
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echo "The hostname you chose '$PRIMARY_HOSTNAME' is listed in the"
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echo "Spamhaus Domain Block List. See http://www.spamhaus.org/dbl/"
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echo "and http://www.spamhaus.org/query/domain/$PRIMARY_HOSTNAME."
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echo
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echo "You will not be able to send mail using this domain name, so"
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echo "setup cannot continue."
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echo
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exit 1
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fi
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# Stop if the IPv4 address is listed in the ZEN Spamhouse Block List.
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# The user might have ended up on an IP address that was previously in use
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# by a spammer, or the user may be deploying on a residential network. We
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# will not be able to reliably send mail in these cases.
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REVERSED_IPV4=$(echo $PUBLIC_IP | sed "s/\([0-9]*\).\([0-9]*\).\([0-9]*\).\([0-9]*\)/\4.\3.\2.\1/")
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if host $REVERSED_IPV4.zen.spamhaus.org > /dev/null; then
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echo
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echo "The IP address $PUBLIC_IP is listed in the Spamhaus Block List."
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echo "See http://www.spamhaus.org/query/ip/$PUBLIC_IP."
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echo
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echo "You will not be able to send mail using this machine, so setup"
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echo "cannot continue."
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echo
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echo "Associate a different IP address with this machine if possible."
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echo "Many residential network IP addresses are listed, so Mail-in-a-Box"
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echo "typically cannot be used on a residential Internet connection."
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echo
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exit 1
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fi
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# Stop if we cannot make an outbound connection on port 25. Many residential
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# networks block outbound port 25 to prevent their network from sending spam.
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# See if we can reach one of Google's MTAs with a 5-second timeout.
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if ! nc -z -w5 aspmx.l.google.com 25; then
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echo
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echo "Outbound mail (port 25) seems to be blocked by your network."
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echo
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echo "You will not be able to send mail using this machine, so setup"
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echo "cannot continue."
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echo
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echo "Many residential networks block port 25 to prevent hijacked"
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echo "machines from being able to send spam. I just tried to connect"
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echo "to Google's mail server on port 25 but the connection did not"
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echo "succeed."
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echo
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exit 1
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fi
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