Allow custom massdns path

.env.default

@@ -3,3 +3,4 @@ CACHE_SIZE=536870912
 MASSDNS_HASHMAP_SIZE=1000
 PROFILE=0
 SINGLE_PROCESS=0
+MASSDNS_BINARY=massdns

resolve_subdomains.sh

@@ -17,7 +17,7 @@ pv subdomains/*.list | ./validate_list.py --domain | rev | sort -u | rev > temp/
 
 log "Resolving subdomain…"
 date +%s > "last_updates/massdns.txt"
-massdns --output Snrql --retry REFUSED,SERVFAIL --hashmap-size "$MASSDNS_HASHMAP_SIZE" --resolvers temp/all_nameservers_ip4.list --outfile temp/all_resolved.txt temp/all_subdomains.list
+"$MASSDNS_BINARY" --output Snrql --retry REFUSED,SERVFAIL --hashmap-size "$MASSDNS_HASHMAP_SIZE" --resolvers temp/all_nameservers_ip4.list --outfile temp/all_resolved.txt temp/all_subdomains.list
 
 log "Importing into database…"
 [ $SINGLE_PROCESS -eq 1 ] && EXTRA_ARGS="--single-process"