From 564b2469405464ade77e64891f2114c5da7bb4cc Mon Sep 17 00:00:00 2001
From: Eric Renfro <psi-jack@linux-help.org>
Date: Mon, 23 Aug 2021 10:36:23 -0400
Subject: [PATCH] Added linode-v4 agent

---
 src/agents.d/update-dns-linode-v4 | 137 ++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100755 src/agents.d/update-dns-linode-v4

diff --git a/src/agents.d/update-dns-linode-v4 b/src/agents.d/update-dns-linode-v4
new file mode 100755
index 0000000..5a86809
--- /dev/null
+++ b/src/agents.d/update-dns-linode-v4
@@ -0,0 +1,137 @@
+#!/bin/bash
+
+# Internal Initialization
+
+source "${DIP_FUNCTIONS}"
+
+if [[ -r "${DIP_BASE_DIR}/conf.d/${DIP_AGENT_NAME}.conf" ]]; then
+    source "${DIP_BASE_DIR}/conf.d/${DIP_AGENT_NAME}.conf"
+fi
+
+if [[ -r "${DIP_BASE_DIR}/conf.d/${DIP_AGENT_EXEC}.conf" ]]; then
+    source "${DIP_BASE_DIR}/conf.d/${DIP_AGENT_EXEC}.conf"
+fi
+
+if [[ -z "$agent_update_dns_linode_v4_token" ]]; then
+    logerr "ERROR: Need 'agent_update_dns_linode_v4_token' to be defined to your Linode API Access Token"
+    exit 99
+fi
+
+# Get Domain Name
+
+_update_dns_linode_v4_get_domain() {
+    local domain_id
+    local response
+    local page
+    local total_pages
+    local i=2
+    local p=1
+
+    while read -r response
+    do
+        if [[ -n "$(echo "$response" | jq "select(.errors != null)")" ]]
+        then
+            return 1
+        fi
+
+        page=$(echo "$response" | jq ".page")
+        total_pages=$(echo "$response" | jq ".pages")
+
+        while true
+        do
+            h=$(printf "%s" "$DIP_RECORD" | cut -d . -f $i-100)
+
+            if [[ -z "$h" ]]
+            then
+                return 1
+            fi
+
+            domain_id="$(sed -e 's/^"//' -e 's/"$//' <<<"$(echo "$response" | jq --arg domain="$h" '.data[] | select(.domain==$domain).id')")"
+
+            if [[ -n "$domain_id" ]]
+            then
+                _sub_domain=$(printf "%s" "$DIP_RECORD" | cut -d . -f-$p)
+                _domain=$h
+                _domain_id=$domain_id
+                return 0
+            fi
+            p=$i
+            (( i++ )) || true
+        done
+
+        if [[ $page -ge $total_pages ]]
+        then
+            return 1
+        fi
+    done <<< "$(curl --silent -X GET -H "Content-Type: application/json" -H "Authorization: Bearer $agent_update_dns_linode_v4_token" "https://api.linode.com/v4/domains/")"    
+    return 1
+}
+
+_update_dns_linode_v4_get_record_id() {
+    local domain=$1
+    local dtype=$2
+    local subdomain=$3
+    local response
+    local record_id
+
+    if [[ "${#subdomain}" -gt "${#domain}" ]]; then
+        subdomain="${subdomain:0:${#subdomain}-${#domain}-1}"
+    else
+        subdomain="@"
+    fi
+
+    response=$(curl \
+        --silent \
+        -X GET \
+        -H "Content-Type: application/json" \
+        -H "Authorization: Bearer $agent_update_dns_linode_v4_token" \
+        "https://api.linode.com/v4/domains/$domain/records")
+    
+    #sed -e 's/^"//' -e 's/"$//' <<<"$(echo "$response" | jq ".domain_names[].name" )"
+    record_id="$(echo "$response" | jq --arg subdomain "$subdomain" --arg dtype "$dtype" '.data[] | select(.name==$subdomain and .type==$dtype).id')"
+
+    if [[ -z "$record_id" ]]
+    then
+        return 1
+    else
+        _record_id=$record_id
+        return 0
+    fi
+}
+
+if _update_dns_linode_v4_get_domain; then
+    if valid_ipv4 "$DIP_CUR_IP"; then
+        log "Updating Linode DNS IPv4 Record: ${DIP_RECORD} to ${DIP_CUR_IP}"
+
+        if _update_dns_do_get_record_id "$_domain_id" "A" "$_sub_domain"
+        then
+            curl --silent \
+                -X PUT \
+                -H "Content-Type: application/json" \
+                -H "Authorization: Bearer $agent_update_dns_linode_v4_token" \
+                -d '{"target":"'$DIP_CUR_IP'"}' \
+                "https://api.linode.com/v4/domains/$_domain_id/records/$_record_id" > /dev/null;
+        else
+            logerr "WARN: No A record exists for $DIP_RECORD"
+        fi
+    fi
+
+    if valid_ipv6 "$DIP_CUR_IP"; then
+        log "Updating Linux DNS IPv6 Record: ${DIP_RECORD} to ${DIP_CUR_IP}"
+
+        if _update_dns_do_get_record_id "$_domain_id" "AAAA" "$_sub_domain"
+        then
+            curl --silent \
+                -X PUT \
+                -H "Content-Type: application/json" \
+                -H "Authorization: Bearer $agent_update_dns_linode_v4_token" \
+                -d '{"target":"'$DIP_CUR_IP'"}' \
+                "https://api.linode.com/v4/domains/$_domain_id/records/$_record_id" > /dev/null;
+        else
+            logerr "WARN: No AAAA record exists for $DIP_RECORD"
+        fi
+    fi
+else
+    logerr "ERROR: Cannot find domain in DigitalOcean DNS API"
+    exit 99
+fi