Unix: update a-record script
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@ -206,16 +206,15 @@ domain! Of course, make sure your router's ports are forwarding to your
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computer.
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computer.
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We now need to make your computer update Cloudflare's DNS, whenever the IP
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We now need to make your computer update Cloudflare's DNS, whenever the IP
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changes. I use the script below to do this. Fill in the `HOST`, `DOMAIN`,
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changes. I use the script below to do this. Fill in the `HOST4`, `HOST6`,
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`TOKEN`, `ZONE_ID`. The `TOKEN` is your Cloudflare application token:
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`TOKEN`, `ZONE_ID`. The `TOKEN` is your Cloudflare application token:
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```bash
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```bash
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#!/usr/bin/env bash
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#!/usr/bin/env bash
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declare wan_ip_record wan_ip cf_records host_record cf_host_ip cf_rec_id
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declare wan_ip_record wan_ip cf_records host_record cf_host_ip cf_rec_id
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declare -r HOST4='mycomputer'
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declare -r HOST4='mycomputer.example.com'
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declare -r HOST6='mycomputer6'
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declare -r HOST6='mycomputer6.example.com'
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declare -r DOMAIN='example.com'
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declare -r TOKEN='CLOUDFLARE_TOKEN_HERE'
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declare -r TOKEN='CLOUDFLARE_TOKEN_HERE'
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declare -r ZONE_ID='CLOUDFLARE_ZONEID_HERE'
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declare -r ZONE_ID='CLOUDFLARE_ZONEID_HERE'
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@ -223,17 +222,47 @@ utc_date() {
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date -u +'%Y-%m-%d_%H-%M-%S_UTC'
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date -u +'%Y-%m-%d_%H-%M-%S_UTC'
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}
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}
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#╔─────────────────────────────────────────────────────────────────────────────╗
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cf_update_ip() {
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#│ Gετ WΛN IP |
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local -r my_ip="$1"
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#╚─────────────────────────────────────────────────────────────────────────────╝
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local -r cf_ip="$2"
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# Comment out as needed. Many home networks don't have ipv6 support
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local -r cf_id="$3"
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if ! wan_ipv4="$(curl -s https://api4.ipify.org)"; then
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local -r host="$4"
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echo "Request for ipv4 WAN timed out" >&2
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exit 1
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if [[ -z "$my_ip" || "$my_ip" == null ]]; then
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elif ! wan_ipv6="$(curl -s https://api6.ipify.org)"; then
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echo "Failed to find local WAN ip: $my_ip" >&2
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echo "Request for ipv6 WAN timed out" >&2
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return 1
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exit 1
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elif [[ -z "$cf_ip" || "$cf_ip" == null ]]; then
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echo "Failed to find content of A record for $host" >&2
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return 1
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elif [[ -z "$cf_id" || "$cf_id" == null ]]; then
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echo "Failed to find A record ID for $host" >&2
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return 1
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elif [[ "$my_ip" == "$cf_ip" ]]; then
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echo "Cloudflare for $host is up to date @ $(utc_date)" >&2
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else
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echo "Updating Cloudflare's for $host from $cf_ip to $my_ip" >&2
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patch_response="$(curl -s --request PATCH \
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--url "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records/${cf_id}" \
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--header 'Content-Type: application/json' \
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--header "Authorization: Bearer $TOKEN" \
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--data '{
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"comment": "'"${host} @ $(utc_date)"'",
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"content": "'"$my_ip"'",
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"name": "'"$host"'",
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"proxied": false,
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"ttl": 1
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}')"
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if [[ "$(echo "$patch_response" | jq -r '.success')" == true ]]; then
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echo "Update to $my_ip for $host succeeded @ $(utc_date)" >&2
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else
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echo "Failed to update $host. DUMP:"
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echo "$patch_response"
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return 1
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fi
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fi
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fi
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}
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#╔─────────────────────────────────────────────────────────────────────────────╗
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#╔─────────────────────────────────────────────────────────────────────────────╗
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#│ Gετ Λ rεcδrd δη Clδμdflαrε |
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#│ Gετ Λ rεcδrd δη Clδμdflαrε |
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@ -248,64 +277,31 @@ then
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fi
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fi
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declare -r cf_ipv4_record="$(echo "$cf_records" |
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declare -r cf_ipv4_record="$(echo "$cf_records" |
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jq '.result[] | select(.name == "'"${HOST4}.${DOMAIN}"'")')"
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jq '.result[] | select(.name == "'"$HOST4"'")')"
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declare -r cf_ipv4_ip="$(echo "$cf_ipv4_record" | jq --raw-output '.content')"
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declare -r cf_ipv4_ip="$(echo "$cf_ipv4_record" | jq --raw-output '.content')"
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declare -r cf_ipv4_id="$(echo "$cf_ipv4_record" | jq --raw-output '.id')"
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declare -r cf_ipv4_id="$(echo "$cf_ipv4_record" | jq --raw-output '.id')"
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declare -r cf_ipv6_record="$(echo $cf_records |
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declare -r cf_ipv6_record="$(echo $cf_records |
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jq --raw-output '.result[] | select(.name == "'"${HOST6}.${DOMAIN}"'")')"
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jq --raw-output '.result[] | select(.name == "'"$HOST6"'")')"
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declare -r cf_ipv6_ip="$(echo "$cf_ipv6_record" | jq --raw-output '.content')"
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declare -r cf_ipv6_ip="$(echo "$cf_ipv6_record" | jq --raw-output '.content')"
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declare -r cf_ipv6_id="$(echo "$cf_ipv6_record" | jq --raw-output '.id')"
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declare -r cf_ipv6_id="$(echo "$cf_ipv6_record" | jq --raw-output '.id')"
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#╔─────────────────────────────────────────────────────────────────────────────╗
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#╔─────────────────────────────────────────────────────────────────────────────╗
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#│ Sετ Λ rεcδrd τδ cμrrεητ WΛN |
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#│ Sετ Λ rεcδrd τδ cμrrεητ WΛN |
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#╚─────────────────────────────────────────────────────────────────────────────╝
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#╚─────────────────────────────────────────────────────────────────────────────╝
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cf_update_ip() {
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if wan_ipv4="$(curl -s https://api4.ipify.org)"; then
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local -r my_ip="$1"
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echo "ipv4 record: $wan_ipv4"
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local -r cf_ip="$2"
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cf_update_ip "$wan_ipv4" "$cf_ipv4_ip" "$cf_ipv4_id" "$HOST4"
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local -r cf_id="$3"
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local -r host="$4"
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local -r domain="$5"
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local -r url="${host}.${domain}"
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if [[ -z "$my_ip" || "$my_ip" == null ]]; then
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echo "Failed to find local WAN ip: $my_ip" >&2
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return 1
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elif [[ -z "$cf_ip" || "$cf_ip" == null ]]; then
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echo "Failed to find content of A record for $url" >&2
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return 1
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elif [[ -z "$cf_id" || "$cf_id" == null ]]; then
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echo "Failed to find A record ID for $url" >&2
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return 1
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elif [[ "$my_ip" == "$cf_ip" ]]; then
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echo "Cloudflare for $url is up to date @ $(utc_date)" >&2
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else
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else
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echo "Updating Cloudflare's for $url from $cf_ip to $my_ip" >&2
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echo "Hosts timed out on ipv4. Not updating ipv4 A record" >&2
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fi
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patch_response="$(curl -s --request PATCH \
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if wan_ipv6="$(curl -s https://api6.ipify.org)"; then
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--url "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records/${cf_id}" \
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echo "ipv6 record: $wan_ipv6"
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--header 'Content-Type: application/json' \
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cf_update_ip "$wan_ipv6" "$cf_ipv6_ip" "$cf_ipv6_id" "$HOST6"
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--header "Authorization: Bearer $TOKEN" \
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--data '{
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"comment": "'"${host} @ $(utc_date)"'",
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"content": "'"$my_ip"'",
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"name": "'"$url"'",
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"proxied": false,
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"ttl": 1
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}')"
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if [[ "$(echo "$patch_response" | jq -r '.success')" == true ]]; then
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echo "Update to $my_ip for $url succeeded @ $(utc_date)" >&2
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else
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else
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echo "Failed to update $url. DUMP:"
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echo "Hosts timed out on ipv6. Not updating ipv6 AAAA record" >&2
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echo "$patch_response"
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exit 1
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fi
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fi
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fi
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}
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cf_update_ip "$wan_ipv4" "$cf_ipv4_ip" "$cf_ipv4_id" "$HOST4" "$DOMAIN"
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cf_update_ip "$wan_ipv6" "$cf_ipv6_ip" "$cf_ipv6_id" "$HOST6" "$DOMAIN"
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```
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```
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Now we need a systemd-timer to run this script. I run it once every 15 minutes.
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Now we need a systemd-timer to run this script. I run it once every 15 minutes.
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