3 # this set of functions serve the main purpose of adding new domains or subdomains to the bind9 DNS server on the current host.
4 # it is currently highly specific to running a bunch of domains on a linux VM, where the VM has one IP address.
5 # note that bind 'named' must already be configured.
6 # also, it is assumed that if a subdomain is being added, then the containing domain has already been configured and is
7 # configured in a file similar to "blah.com.conf" in /etc/bind.
9 # Author: Chris Koeritz
11 # some defaults that are convenient for current purposes.
12 # hmmm: these would need to be parameterized somehow for this script to become really general.
14 # in our scheme, the single IP address that all our domains map to.
15 IP_ADDRESS="10.28.42.20"
16 # the email address (where first dot is replaced by @) for the administrator of the domain.
17 SERVER_ADMIN="fred.cakelampvm.com"
18 # the name of the name server for the new domains (should already be configured).
19 MAIN_NAME_SERVER="ns.cakelampvm.com"
20 # the name of the mail server for a new domain (should already be configured).
21 MAIL_SERVER="mail.cakelampvm.com"
22 # the distribution name to be listed in info for the new domain or subdomain.
25 # creates a totally new domain config file for DNS.
26 function write_new_domain_file()
28 local domain_name="$1"; shift
30 local domain_file="/etc/bind/${domain_name}.conf"
32 echo "adding a totally new domain called $domain_name"
33 echo "using the config file: $domain_file"
35 if [ -f $domain_file ]; then
36 echo "The domain configuration file already exists at:"
38 echo "Please remove this file before proceeding, if it is junk. For example:"
39 echo " sudo rm $domain_file"
45 @ IN SOA @ ${SERVER_ADMIN}. (
52 IN NS ${MAIN_NAME_SERVER}.
53 IN MX 10 ${MAIL_SERVER}.
55 ${domain}. IN A ${IP_ADDRESS}
56 IN HINFO \"linux server\" \"${DISTRO}\"
62 function add_zone_for_new_domain()
64 local domain_name="$1"; shift
66 local domain_file="/etc/bind/${domain_name}.conf"
68 echo "adding a new domain configured by ${domain_file} into"
69 echo "the named.conf.local configuration file."
71 # need to write the reference to the new conf file in the zone list.
74 zone \"${domain_name}\" in {
75 file \"${domain_file}\";
81 #>> /etc/bind9/named.conf.local
85 # adds a new subdomain under a containing domain.
86 function add_new_subdomain()
88 local new_domain="$1"; shift
90 # split up the full domain name into subdomain portion and containing domain.
91 local subdomain="${new_domain%.*.*}"
92 local containing_domain="${new_domain#*.}"
94 echo "adding a subdomain $subdomain to containing domain $containing_domain"
96 local domain_file="/etc/bind/${containing_domain}.conf"
97 # see if config file already exists; if not, complain.
98 if [ ! -f "$domain_file" ]; then
99 echo "The domain configuration file for $new_domain is missing."
100 echo "It should already be present in: $domain_file"
101 echo "Please add the containing domain before trying to add a subdomain."
105 # see if subdomain already present in config.
106 if [ $(grep -q "$new_domain" "$domain_file") ]; then
107 echo "The subdomain $subdomain already seems to exist in the domain"
108 echo "configuration file: $domain_file"
109 echo "Please edit the config file to remove the subdomain before trying"
110 echo "to re-add the subdomain."
114 # append the new subdomain into the config file.
116 ${subdomain}.${containing_domain}. IN A ${IP_ADDRESS}
117 IN HINFO \"linux server\" \"${DISTRO}\"
120 #>> /etc/bind/${containing_domain}.conf
124 function restart_bind()
126 echo restarting DNS server.
127 service bind9 restart
128 if [ $? -ne 0 ]; then
129 echo "The bind service did not restart properly. Please check the error logs."
132 echo DNS server restarted.
135 # main body of script.
137 if (( $EUID != 0 )); then
138 echo "This script must be run as root or sudo."
142 new_domain="$1"; shift
144 if [ -z "$new_domain" ]; then
145 echo "This script needs a domain name to add to DNS."
149 # if domain name has three or more components, then add a subdomain.
150 # otherwise, add a full new domain.
151 if [[ $new_domain == *"."*"."* ]]; then
152 # add a subdomain to the containing domain.
153 add_new_subdomain "$new_domain"
156 # create a totally new domain in DNS.
157 write_new_domain_file "$new_domain"
158 add_zone_for_new_domain "$new_domain"