Script to set a Global IP address for resellers

[Panormitis]

Hello,
I'm using DirectAdmin & Blesta and I think I'm encountering some bugs on both of them.
I want when creating a reseller account with no additional IP addresses to use a specified IP address (Global IP in my case).
However no matter what I do, the Server IP gets picked up, (I don't want that) or a free IP gets used together with the Server IP as additional (I don't want to waste free IP addresses). If no IPv4 are free, an IPv6 IP address gets picked up. I also don't want to use the server's main IP address.
On my server I use both IPv4 & IPv6 addresses (some IPv6 addresses are linked to IPv4 addresses some are free) perhaps this amplifies the Issues I'm having with reseller packages. In any case Global IPs are not getting picked up, which is frustrating. Regular hosting packages on the other hand works like a charm.

I wanted a way for reseller accounts to use a predetermined Global IP Address to be shared among them, and if some reseller wanted a dedicated IP address, this could be setup manually later. While we are at it, let's make virtual nameservers for the reseller accounts too (ns1.domain.com & ns2.domain.com).

So I created a script to do these things automatically. In case you find it useful, feel free to use it.
Create a file named user_create_post_confirmed.sh in /usr/local/directadmin/scripts/custom and set it to 700 permissions.

#!/bin/bash

# This script will do the following:
# 1. Create virtual nameservers (ns1.domain.com & ns2.domain.com) automatically for a newly created reseller.
# 2. Set the reseller IP address to the one we specify.
# 3. Executes an API call to rewrite the DNS records of the reseller's domain.
# 4. Add AAAA records for the virtual nameservers.
# 5. Create a reseller.conf.virtualns file, for the other script to use.

# DirectAdmin provides these environment variables when this script runs: $username, $usertype, $domain.
USERNAME="$username"
USER_TYPE="$usertype"
DOMAIN="$domain"
DA_ADMIN="admin" # Set your administrator username here, for the API call.
TQ="/usr/local/directadmin/data/task.queue"
DTQ="/usr/local/directadmin/dataskq"
USER_DATA_DIR="/usr/local/directadmin/data/users/${USERNAME}"
DOMAIN_DATA_DIR="${USER_DATA_DIR}/domains"
RESET_DN_CALL="$(da api-url --user=${DA_ADMIN})/CMD_API_DNS_ADMIN?domain=${DOMAIN}&action=select&reset=anything"
LOG_FILE="/var/log/directadmin/user_create_post_confirmed.log"


NEW_RESELLER_IP="1.22.333.444" # Set Main IP of reseller.
NS_IPV6="1234:abcd:ffff:ced:0:0:0:444" # Linked IP to the one above, for the AAAA nameserver records.

# Ensure the user is a reseller before doing anything.
if [ "${USER_TYPE}" = "reseller" ]; then
    echo "$(date): Starting script for reseller ${USERNAME}." >> ${LOG_FILE}

    # Get the default server IP.
    SERVER_IP=$(grep "*:" /etc/virtual/domainips | cut -d: -f2)
    ESCAPED_SERVER_IP=$(echo "${SERVER_IP}" | sed 's/\./\\./g')

    # Replace existing ns1 and ns2 entries with new ones in user.conf file.
    sed -i "s/^ns1=.*/ns1=${DOMAIN}/" "${USER_DATA_DIR}/user.conf"
    sed -i "s/^ns2=.*/ns2=${DOMAIN}/" "${USER_DATA_DIR}/user.conf"
    echo "$(date): Replaced old ns1 and ns2 values with the new ones in user.conf file." >> ${LOG_FILE}

    # Server IP keeps being added as additional IP. Let's remove it...
    if grep -q "^${SERVER_IP}" "${USER_DATA_DIR}/user_ip.list"; then
        sed -i "/^${ESCAPED_SERVER_IP}/d" "${USER_DATA_DIR}/user_ip.list"
        echo "$(date): Removed ${SERVER_IP} as additional IP for reseller ${USERNAME}." >> ${LOG_FILE}
    fi

    # Server IP keeps being added as domain IP too. Let's remove it...
    if grep -q "^ip=${SERVER_IP}" "${DOMAIN_DATA_DIR}/${DOMAIN}.conf"; then
        sed -i "s/${ESCAPED_SERVER_IP}/${NEW_RESELLER_IP}/" "${DOMAIN_DATA_DIR}/${DOMAIN}.conf"
        [ -f "${DOMAIN_DATA_DIR}/${DOMAIN}.ftp" ]     && sed -i "s/${ESCAPED_SERVER_IP}/${NEW_RESELLER_IP}/" "${DOMAIN_DATA_DIR}/${DOMAIN}.ftp"
        [ -f "${DOMAIN_DATA_DIR}/${DOMAIN}.ip_list" ] && sed -i "s/${ESCAPED_SERVER_IP}/${NEW_RESELLER_IP}/" "${DOMAIN_DATA_DIR}/${DOMAIN}.ip_list"
        echo "$(date): Replaced ${SERVER_IP} with ${NEW_RESELLER_IP} for ${DOMAIN} of reseller ${USERNAME}." >> ${LOG_FILE}
    fi

    # We need to set which shared IP is going to be used for domains...
    echo "${NEW_RESELLER_IP}" > "${USER_DATA_DIR}/ip.list"
    echo "$(date): Set ${NEW_RESELLER_IP} to the reseller's ip.list file, to be used for domains." >> ${LOG_FILE}

    # Replace reseller's Main IP with the one we specified.
    sed -i "s/${ESCAPED_SERVER_IP}/${NEW_RESELLER_IP}/" "${USER_DATA_DIR}/user.conf"
    echo "$(date): Replaced IP address with ${NEW_RESELLER_IP} for reseller ${USERNAME} in the file user.conf." >> ${LOG_FILE}

    # Let's reset the domain.
    curl -s -XPOST "${RESET_DN_CALL}" > /dev/null
    echo "$(date): Domain ${DOMAIN} of reseller ${USERNAME} has been reset." >> ${LOG_FILE}

    # Delete any old AAAA records for nameservers, just in case they exist.
    echo "action=dns&do=delete&domain=${DOMAIN}&type=AAAA&name=ns1.${DOMAIN}.&value=*" >> ${TQ}.cb;
    echo "action=dns&do=delete&domain=${DOMAIN}&type=AAAA&name=ns2.${DOMAIN}.&value=*" >> ${TQ}.cb; ${DTQ} --custombuild

    # Add the new AAAA records for the virtual nameservers.
    echo "action=dns&do=add&domain=${DOMAIN}&type=AAAA&name=ns1.${DOMAIN}.&value=${NS_IPV6}" >> ${TQ}.cb;
    echo "action=dns&do=add&domain=${DOMAIN}&type=AAAA&name=ns2.${DOMAIN}.&value=${NS_IPV6}" >> ${TQ}.cb; ${DTQ} --custombuild
    echo "$(date): Added AAAA records for the virtual nameservers of ${DOMAIN}." >> ${LOG_FILE}

    # Set named to reload.
    echo 'action=named&value=reload' >> ${TQ}

    # Finally, let's create a reseller.conf.virtualns file, for the virtual nameservers we created. Cron will apply the modifications afterwards.
    echo "NS_1=ns1.${DOMAIN}" > "${USER_DATA_DIR}/reseller.conf.virtualns"
    echo "NS_2=ns2.${DOMAIN}" >> "${USER_DATA_DIR}/reseller.conf.virtualns"
    echo "DOMAIN=${DOMAIN}" >> "${USER_DATA_DIR}/reseller.conf.virtualns"
    echo "$(date): Modifications file created at: ${USER_DATA_DIR}/reseller.conf.virtualns, now it's up to Cron to apply them." >> ${LOG_FILE}
fi

echo "$(date): Script completed successfully for reseller ${USERNAME}." >> ${LOG_FILE}
exit 0

One more script is needed, to edit reseller.conf and rewrite reseller's domain httpd configuration. Give it any name you like and set a cronjob for it to run periodically, every couple of minutes or so.

#!/bin/bash

# Apply reseller.conf modifications if they are present, in case the script user_create_post_confirmed.sh generated any.
# Then do an httpd configuration rewrite.

USER_DATA_DIR="/usr/local/directadmin/data/users"

# Loop through each user/reseller directory and apply reseller.conf.virtualns changes to reseller.conf file.
for USER_NAME in "${USER_DATA_DIR}"/*/; do
    RESELLER_CONF_FILE="${USER_NAME}reseller.conf"
    RESELLER_NS_FILE="${USER_NAME}reseller.conf.virtualns"

    # Check if both files reseller.conf and reseller.conf.virtualns exist first.
    if [[ -f "${RESELLER_CONF_FILE}" && -f "${RESELLER_NS_FILE}" ]]; then
        source "${RESELLER_NS_FILE}"
        /usr/bin/sed -i "s/^ns1=.*/ns1=${NS_1}/" "${RESELLER_CONF_FILE}"
        /usr/bin/sed -i "s/^ns2=.*/ns2=${NS_2}/" "${RESELLER_CONF_FILE}"
        /usr/bin/rm -f "${RESELLER_NS_FILE}"
        /usr/bin/echo "action=rewrite&value=httpd&domain=${DOMAIN}" >> /usr/local/directadmin/data/task.queue
        /usr/bin/echo "Virtual Nameservers applied to ${RESELLER_CONF_FILE}."
        /usr/bin/echo "Requested an httpd configuration rewrite of ${DOMAIN}."
    fi
done
exit 0

EDIT 1: Updated the script, curl no longer needs username & password for the API call. Thanks to Roman's advice from DA Support.
EDIT 2: Added second script.