X-Git-Url: http://git.euphorik.ch/?a=blobdiff_plain;f=src%2Fmain.rs;h=67c251a9b668376c6eaf081fa6151b63160bedbd;hb=f66ea654402cb0a44d075466a1a55a89b5512e4a;hp=1509a258bdc164947a62b401f399128f636cc15d;hpb=829a38c408dad553be65663ffad2094d8ec76510;p=gandi_dns_update.git

diff --git a/src/main.rs b/src/main.rs
index 1509a25..67c251a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,19 +1,181 @@
-// API Reference: https://api.gandi.net/docs/livedns/
-// Some inspiration: https://github.com/rmarchant/gandi-ddns/blob/master/gandi_ddns.py
+/*
+ * API Reference: https://api.gandi.net/docs/livedns/
+ * Some similar implementations:
+ * - https://github.com/rmarchant/gandi-ddns/blob/master/gandi_ddns.py
+ * - https://github.com/brianhp2/gandi-automatic-dns
+ *
+ * TODO:
+ * - Log to stdout with (at least) timestamps.
+ * - Renew function.
+ */
 
+#![cfg_attr(debug_assertions, allow(unused_variables, unused_imports, dead_code))]
 
-fn main() {
-    println!("Hello, world!");
+use std::{ fs::File, net::{ IpAddr, Ipv4Addr }, thread, time };
+use ron::{ de::from_reader, ser::to_writer };
+use serde::{ Deserialize, Serialize };
+use serde_json::{ Value, json };
+
+// A generic result of type 'T'.
+type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
+
+#[derive(Debug)]
+struct Error {
+    message: String
 }
 
-fn get_real_ip() {
+impl std::fmt::Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "Error: {}", &self.message)
+    }
+}
 
+impl std::error::Error for Error { }
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+struct Config {
+    delay_between_check: time::Duration,
+    api_key: String,
+    fqdn: String,
+    domains: Vec<String>,
+    ttl: i32
 }
 
-fn get_current_record_ip() {
+impl Config {
+    fn default() -> Self {
+        Config { delay_between_check: time::Duration::from_secs(120), api_key: String::from(""), fqdn: String::from(""), domains: Vec::new(), ttl: 300 }
+    }
+
+    fn read(file_path: &str) -> Result<Config> {
+        match File::open(file_path) {
+            Ok(file) => from_reader(file).map_err(|e| e.into()),
+            // The file doesn't exit -> create it with default values.
+            Err(_) => {
+                let file = File::create(file_path)?;
+                let default_config = Config::default();
+                to_writer(file, &default_config)?;
+                Ok(default_config)
+            }
+        }
+    }
+}
+
+const FILE_CONF: &str = "config.ron";
+
+fn main() -> Result<()> {
+
+    println!("GANDI DynDNS");
 
+    let config = Config::read(FILE_CONF)?;
+
+    println!("Configuration: {:?}", Config { api_key: String::from("*****"), ..config.clone() });
+
+    loop {
+        let time_beginning_loop = time::Instant::now();
+
+        if let Err(err) = check_and_update_dns(&config.api_key, &config.fqdn, &config.domains, config.ttl) {
+            println!("!! Error: {}", err);
+        }
+
+        let elapsed = time::Instant::now() - time_beginning_loop;
+
+        if elapsed < config.delay_between_check {
+            let to_wait = config.delay_between_check - elapsed;
+            thread::sleep(to_wait);
+        }
+    }
 }
 
-fn update_record_ip() {
+fn check_and_update_dns(api_key: &str, fqdn: &str, domains: &Vec<String>, ttl: i32) -> Result<()> {
+    let real_ip = get_real_ip()?;
+
+    for domain in domains {
+        let current_ip = get_current_record_ip(api_key, domain, fqdn)?;
+
+        if real_ip != current_ip {
+            println!("IP addresses don't match for domain {}: real = {}, dns = {}. Renewing DNS...", domain, real_ip, current_ip);
+            update_record_ip(api_key, domain, fqdn, real_ip, ttl)?;
+            println!("Renewing of {} successfully", domain);
+        }
+    }
+
+    Ok(())
+}
+
+fn get_real_ip() -> Result<Ipv4Addr> {
+
+    let url = "https://api.ipify.org";
+    let client = reqwest::blocking::Client::new();
+
+    match client.get(url).send() {
+        Ok(resp) =>
+            if resp.status().is_success() {
+                let content = resp.text().unwrap();
+                match content.parse::<IpAddr>() {
+                    Ok(IpAddr::V4(ip_v4)) => Ok(ip_v4),
+                    _ => Err(Box::new(Error { message: String::from("Can't parse IPv4 from ipify") }))
+                }
+            } else {
+                Err(Box::new(Error { message: format!("Request unsuccessful: {:#?}", resp) }))
+            },
+
+        Err(error) => {
+            Err(Box::new(Error { message: format!("Error during request: {:?}", error) }))
+        }
+    }
+}
+
+enum Method {
+    Put(String),
+    Get
+}
+
+fn request_livedns_gandi(api_key: &str, url_fragment: &str, method: Method) -> Result<Value> {
+    let url = format!("https://api.gandi.net/v5/livedns/{}", url_fragment);
+    let client = reqwest::blocking::Client::new();
+
+    let request_builder =
+        match method {
+            Method::Put(body) => client.put(url).body(body),
+            Method::Get => client.get(url)
+        };
+
+    match request_builder.header("Authorization", format!("Apikey {}", api_key)).send() {
+        Ok(resp) =>
+            if resp.status().is_success() {
+                let content = resp.text().unwrap();
+                Ok(serde_json::from_str(&content).unwrap())
+            } else {
+                Err(Box::new(Error { message: format!("Request unsuccessful: {:#?}", resp) }))
+            },
+        Err(error) =>
+            Err(Box::new(Error { message: format!("Error during request: {:?}", error) }))
+    }
+}
+
+fn get_current_record_ip(api_key: &str, name: &str, fqdn: &str) -> Result<Ipv4Addr> {
+    let json_value = request_livedns_gandi(api_key, &format!("domains/{}/records/{}/A", fqdn, name), Method::Get)?;
+
+    match &json_value["rrset_values"][0] {
+        Value::String(ip_str) =>
+            Ok(ip_str.parse()?),
+        _ =>
+            Result::Err(Box::new(Error { message: format!("Unable to extract the IP from the JSON answer: {}", json_value) }))
+    }
+}
+
+fn update_record_ip(api_key: &str, name: &str, fqdn: &str, ip: Ipv4Addr, ttl: i32) -> Result<()> {
+    let json_body =
+        json!(
+            {
+                "rrset_values": [ format!("{}", ip) ],
+                "rrset_ttl": ttl
+            }
+        );
+
+    let json_value = request_livedns_gandi(api_key, &format!("domains/{}/records/{}/A", fqdn, name), Method::Put(json_body.to_string()))?;
+
+    println!("Update response: {}", json_value);
 
+    Ok(())
 }