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November 21, 2019 22:10
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Shell script to run a program with a fake DNS
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| #!/bin/bash | |
| # Usage: | |
| # fake_dns 12.23.45.67 fakedomain.com <program> [args...] | |
| set -e | |
| IP=$1 | |
| HOST=$2 | |
| shift 2 | |
| unshare -m | |
| mount --make-private /etc | |
| NEWHOSTS=$(mktemp) | |
| cat /etc/hosts - >$NEWHOSTS <<<"$IP $HOST" | |
| mount --bind $NEWHOSTS /etc/hosts | |
| exec $@ |
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