cloudflare-dns-updater/src/main.rs

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use cloudflare::{Instance, CloudflareDnsType};
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use reqwest::blocking::get;
use serde_derive::{Deserialize, Serialize};
use std::{fs, thread::{sleep}};
use chrono::{Utc, Duration};
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mod cloudflare;
fn default_key() -> String {
return "".to_string();
}
#[derive(Clone)]
struct ChangeTracker {
created: u16,
updated: u16,
unchanged: u16,
error: u16
}
impl ChangeTracker {
fn new() -> ChangeTracker {
ChangeTracker {
created: 0,
updated: 0,
unchanged: 0,
error: 0
}
}
fn print(&self, f: &str) {
match f {
"" => {
self.print("simple");
}
"simple" => {
println!("{} created", self.created);
println!("{} updated", self.updated);
println!("{} unchanged", self.unchanged);
println!("{} errors", self.error);
}
&_ => {
println!("unknown format pattern '{}', defaulting to 'simple'", f);
self.print("simple");
}
}
}
}
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#[derive(Serialize, Deserialize)]
struct DnsEntry {
name: String,
type4: bool,
type6: bool,
interface: Option<String>,
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}
impl DnsEntry {
/// Updates a single DNS Entry
///
/// * `change4` : IPv4 DNS change tracker, used to print details about the results of the update run after it concludes
/// * `change6` : Same as `change4` but for IPv6
/// * `ips` : Enum of current IPv4 and IPv6 base, used to check against and update the DNS record
/// * `agent` : Cloudflare Auth Agent, provides the needed Authentication headers for the API Calls
/// * `zone_id` : Cloudfalre ID of the Zone this DNS entry resides in, needed for the API Calls
///
/// * `return` : Returns true if the DNS Update failed due to an Error, otherwise returns false
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fn update(
&self,
change4: &mut ChangeTracker,
change6: &mut ChangeTracker,
ips: &Ips,
agent: &Instance,
zone_id: &String
) -> bool {
let mut found4 = false;
let mut found6 = false;
// Loops over every Entry in the List fetched from the Cloudflare API
// If the entry is in this List we need to update it, if not it needs to be created
for cloudflare_entry in &agent.dns_entries {
if cloudflare_entry.is_equal(&self.name) {
// Update IPv4 Entry
if cloudflare_entry.r#type == CloudflareDnsType::A && self.type4 {
found4 = true;
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if cloudflare_entry.is_ip_new(&ips.ipv4) {
match agent.update_entry(cloudflare_entry, &ips.ipv4) {
Ok(success) => {
if success {
change4.updated += 1;
}
else {
change4.error += 1;
}
},
Err(_e) => { return true } // if an error is detected any subsequent calls are likely to fail as well
};
}
else {
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change4.unchanged += 1;
}
}
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// Update IPv6 Entry
else if cloudflare_entry.r#type == CloudflareDnsType::AAAA && self.type6 {
found6 = true;
let ipv6 = ips.ipv6base.clone() + self.interface.as_ref().unwrap();
if cloudflare_entry.is_ip_new(&ipv6) {
match agent.update_entry(cloudflare_entry, &ipv6) {
Ok(success) => {
if success {
change6.updated += 1
}
else {
change6.error += 1
}
},
Err(_e) => { return true } // if an error is detected any subsequent calls are likely to fail as well
};
}
else {
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change6.unchanged += 1;
}
}
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// ignore otherwise
else {}
}
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}
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if !found4 && self.type4 {
match agent.create_entry(zone_id, "A", &self.name, &ips.ipv4) {
Ok(success) => {
if success {
change4.created += 1;
}
else {
change4.error += 1;
};
},
Err(_e) => { return true } // early return since if an error is detected any subsequent calls are likely to fail as well
}
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}
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if !found6 && self.type6 {
let ipv6 = ips.ipv6base.clone() + self.interface.as_ref().unwrap();
match agent.create_entry(zone_id, "AAAA", &self.name, &ipv6) {
Ok(success) => {
if success {
change6.created += 1;
}
else {
change6.error += 1;
};
},
Err(_e) => { return true } // if an error is detected any subsequent calls are likely to fail as well
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};
}
return false; // If this point is reached no error has been caught therefore returning false
}
}
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#[derive(Serialize, Deserialize)]
struct DnsZone {
email: String,
name: String,
id: String,
dns_entries: Vec<DnsEntry>,
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}
impl DnsZone {
/// Attempts to Update the DNS Entries of the Zone with a new IP
///
/// * `change4` : IPv4 DNS change tracker, used to print details about the results of the update run after it concludes
/// * `change6` : Same as `change4` but for IPv6
/// * `ips` : Enum of current IPv4 and IPv6 base, used to check against and update the DNS record
/// * `key` : API Key needed to create the Auth Agent for the API
///
/// * `return` : Returns true if the DNS Updates failed due to an Error, false otherwise
fn update(
&self,
change4: &mut ChangeTracker,
change6: &mut ChangeTracker,
ips: &Ips,
key: &String
) -> bool {
let mut agent = Instance::new(key);
match agent.load_entries(&self.email, &self.id) {
Ok(_) => {
let mut results = Vec::<bool>::new();
for entry in &self.dns_entries {
let result = entry.update(change4, change6, &ips, &agent, &self.id);
results.append(&mut vec!(result));
if result {
break; // if one update fails all others are likely to fail as well
}
}
let result = results.contains(&true);
return result;
},
Err(_e) => { return true }, // Early return since an Error likely means subsequent calls will also fail
}
}
}
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#[derive(Serialize, Deserialize)]
struct DnsConfig {
ipv6_interface: String,
#[serde(default = "default_key")]
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api_key: String,
zones: Vec<DnsZone>,
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}
impl DnsConfig {
fn new() -> DnsConfig {
DnsConfig {
ipv6_interface: "".to_string(),
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api_key: "".to_string(),
zones: Vec::new(),
}
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}
fn load(&mut self) {
let file_contents = match fs::read_to_string("config.json") {
Ok(data) => data,
Err(e) => panic!("{:#?}", e),
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};
let config_parse: DnsConfig = match serde_json::from_str(&file_contents) {
Ok(data) => data,
Err(e) => panic!("{:#?}", e),
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};
let key_file_contents = match fs::read_to_string("api-key.json") {
Ok(data) => data,
Err(e) => panic!("{:#?}", e),
};
let api_key_parse: serde_json::Value = match serde_json::from_str(&key_file_contents) {
Ok(data) => data,
Err(e) => panic!("{:#?}", e),
};
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*self = config_parse;
self.api_key = api_key_parse["api_key"].as_str().unwrap().to_owned();
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}
}
struct Ips {
ipv4: String,
ipv6base: String,
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}
impl Ips {
fn new() -> Ips {
Ips {
ipv4: "0.0.0.0".to_string(),
ipv6base: ":".to_string(),
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}
}
/// Get the current IPv4 address and IPv6 prefix from Mullvad API
///
/// Returns true if the get succeeded and false if it failed.
/// The IPv6 Prefix is generated by removing the IPv6 Interface from the fetched IPv6 address
fn get(&mut self, ipv6_interface: &str) -> bool {
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let ipv4uri = "https://am.i.mullvad.net/ip";
let ipv6uri = "https://ipv6.am.i.mullvad.net/ip";
let mut ret;
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match get(ipv4uri) {
Ok(data) => {
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if data.status() == 200 {
self.ipv4 = data.text().expect("0.0.0.0").trim_end().to_owned();
ret = true;
}
else {
ret = false;
}
},
Err(_e) => {
println!("Could not fetch IPv4");
ret = false;
return ret; // Early return since a fail on IPv4 means a likely fail on IPv6
}
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}
match get(ipv6uri) {
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Ok(data) => {
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if data.status() == 200 {
let ipv6 = match data.text() {
Ok(ip) => {ip},
Err(_) => {panic!("Expected IP, found none")},
};
let stripped = match ipv6.trim_end().strip_suffix(ipv6_interface) {
Some(string) => string.to_string(),
None => ":".to_string(),
};
self.ipv6base = stripped;
ret = true && ret; // Only set ret to true if previous ret is also true
}
else {
ret = false;
}
}
Err(_e) => {
println!("Could not fetch IPv6");
ret = false;
}
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}
return ret;
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}
}
/// Loops over all DNS Entries in the config and calls an update on them
fn update_dns() {
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let mut config = DnsConfig::new();
config.load();
let mut ips = Ips::new();
if ips.get(&config.ipv6_interface) {
println!("Current IPv4: {}", ips.ipv4);
println!("Current IPv6: {}{}", ips.ipv6base, &config.ipv6_interface);
let mut change4 = ChangeTracker::new();
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let mut change6 = ChangeTracker::new();
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let mut update_results = Vec::<bool>::new();
// Iterator does not work here
for zone in &config.zones {
let error = zone.update(&mut change4, &mut change6, &ips, &config.api_key);
update_results.append(&mut vec!(error));
if error {
break; // if one update fails all others are likely to fail as well
}
}
if update_results.contains(&true) {
println!("DNS Update failed due to Network Error")
}
else {
println!("++++A Records+++");
change4.print("simple");
println!("++AAAA Records++");
change6.print("simple")
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}
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}
}
fn main() {
let mut now = Utc::now() - Duration::seconds(59);
let mut current = now;
loop {
now = Utc::now();
if now >= current + Duration::seconds(60) {
current = now;
print!("\x1B[2J\x1B[1;1H");
println!("Starting DNS Update at {} {}", now.format("%H:%M:%S"), now.timezone());
update_dns();
}
else {
sleep(std::time::Duration::from_millis(500));
}
}
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}