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Fix wordlist handling, updated documentation #6

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Fix wordlist handling, updated documentation #6

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eb7b193
Fix hard-coded wordlist reference
TheRealJohnDavies Sep 4, 2019
cf7176e
Added environment variable section to the README
TheRealJohnDavies Sep 4, 2019
39a97bd
Look for wordlist in genhost directory
TheRealJohnDavies Sep 4, 2019
a3d0f96
Allow specifying different word lists via an environment variable
TheRealJohnDavies Sep 4, 2019
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16 changes: 16 additions & 0 deletions README.md
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Expand Up @@ -40,3 +40,19 @@ a shared Git repository so names do not get reused:
$ git add wordlist
$ git commit
$ git push

### Environment Variables
| Variable | Description | Default |
|----------|-------------|---------|
| `GENHOST_DOMAIN` | The domain name to append to generated hostnames | example.com |
| `GENHOST_WORDLIST` | Filename of the word list to use, relative to genhost directory | wordlist |

$ export GENHOST_DOMAIN=github.com
$ ./genhost 3
cover.github.com
kilo.github.com
open.github.com

$ export GENHOST_WORDLIST=colors.txt
$ ./genhost 1
yellow.github.com
15 changes: 13 additions & 2 deletions genhost
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Expand Up @@ -4,9 +4,20 @@
# genhost - generate unused hostnames by randomly picking from a word list
#

readonly wordlist='wordlist'
# script path variables
readonly script=$(realpath $0)
readonly script_name=$(basename $script)
readonly script_dir=$(dirname $script)

readonly wordlist=${GENHOST_WORDLIST:-wordlist}
readonly domain=${GENHOST_DOMAIN:-example.com}

# validate path to word list file
if [[ "$wordlist" == *".."* ]] || [ "$(basename $wordlist)" == "$script_name" ]; then
printf 'genhost: invalid word list file: %s\n' $wordlist
exit 1
fi

# http://mywiki.wooledge.org/BashFAQ/026

# returns random number from 0 to ($1-1) in global var 'r'.
Expand Down Expand Up @@ -75,7 +86,7 @@ else
;;
esac
elif [[ $1 == "list" ]]; then
grep "#" wordlist | sed 's/#//'
grep "#" "$wordlist" | sed 's/#//'
else
printf 'genhost: invalid input\n' >&2
exit 1
Expand Down