Add Android support to iptables platform guard

src/lib.rs

@@ -92,14 +92,14 @@ pub struct IPTables {
     pub is_numeric: bool,
 }
 
-/// Returns `None` because iptables only works on linux
-#[cfg(not(target_os = "linux"))]
-pub fn new(is_ipv6: bool) -> Result<IPTables, Box<dyn Error>> {
-    Err(error_from_str("iptables only works on Linux"))
+/// Returns an error because iptables only works on Linux-based systems
+#[cfg(not(any(target_os = "linux", target_os = "android")))]
+pub fn new(_is_ipv6: bool) -> Result<IPTables, Box<dyn Error>> {
+    Err(error_from_str("iptables only works on Linux-based systems"))
 }
 
 /// Creates a new `IPTables` Result with the command of 'iptables' if `is_ipv6` is `false`, otherwise the command is 'ip6tables'.
-#[cfg(target_os = "linux")]
+#[cfg(any(target_os = "linux", target_os = "android"))]
 pub fn new(is_ipv6: bool) -> Result<IPTables, Box<dyn Error>> {
     let cmd = if is_ipv6 { "ip6tables" } else { "iptables" };
 
@@ -184,7 +184,7 @@ impl IPTables {
 
     /// Checks for the existence of the `rule` in the table/chain.
     /// Returns true if the rule exists.
-    #[cfg(target_os = "linux")]
+    #[cfg(any(target_os = "linux", target_os = "android"))]
     pub fn exists(&self, table: &str, chain: &str, rule: &str) -> Result<bool, Box<dyn Error>> {
         if !self.has_check {
             return self.exists_old_version(table, chain, rule);
@@ -196,7 +196,7 @@ impl IPTables {
 
     /// Checks for the existence of the `chain` in the table.
     /// Returns true if the chain exists.
-    #[cfg(target_os = "linux")]
+    #[cfg(any(target_os = "linux", target_os = "android"))]
     pub fn chain_exists(&self, table: &str, chain: &str) -> Result<bool, Box<dyn Error>> {
         match self.is_numeric {
             false => self