Added support to parse ipv6 address

Author: pdhanoyasplunk

src/client/options.rs

@@ -23,6 +23,7 @@ use serde::{de::Unexpected, Deserialize, Deserializer, Serialize};
 use serde_with::skip_serializing_none;
 use strsim::jaro_winkler;
 use typed_builder::TypedBuilder;
+use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
 
 #[cfg(any(
     feature = "zstd-compression",
@@ -197,64 +198,78 @@ impl ServerAddress {
                 });
             }
         }
-        let mut parts = address.split(':');
-        let hostname = match parts.next() {
-            Some(part) => {
-                if part.is_empty() {
+
+        // Check if the address is IPv6, indicated by square brackets
+        let (hostname, port_str) = if address.starts_with('[') {
+            match address.rfind(']') {
+                Some(bracket_pos) => {
+                    let addr_without_brackets = &address[1..bracket_pos];
+                    let port = if bracket_pos + 1 < address.len() {
+                        if !address[bracket_pos + 1..].starts_with(':') {
+                            return Err(ErrorKind::InvalidArgument {
+                                message: format!("invalid IPv6 address format: expected ':' after ']' in \"{}\"", address),
+                            }.into());
+                        }
+                        Some(&address[bracket_pos + 2..])
+                    } else {
+                        None
+                    }; 
+                    (addr_without_brackets, port)
+                },
+                None => {
                     return Err(ErrorKind::InvalidArgument {
-                        message: format!(
-                            "invalid server address: \"{}\"; hostname cannot be empty",
-                            address
-                        ),
-                    }
-                    .into());
+                        message: format!("invalid IPv6 address format: missing closing bracket in \"{}\"", address),
+                    }.into());
                 }
-                part
             }
-            None => {
-                return Err(ErrorKind::InvalidArgument {
-                    message: format!("invalid server address: \"{}\"", address),
+        } else {
+            match address.rsplit_once(':') {
+                Some((host, port)) => (host, Some(port)),
+                None => {
+                    return Err(ErrorKind::InvalidArgument {
+                        message: format!("invalid server address: \"{}\"; port is required", address),
+                    }.into())
                 }
-                .into())
             }
         };
 
-        let port = match parts.next() {
-            Some(part) => {
-                let port = u16::from_str(part).map_err(|_| ErrorKind::InvalidArgument {
-                    message: format!(
-                        "port must be valid 16-bit unsigned integer, instead got: {}",
-                        part
-                    ),
-                })?;
+        // Validate that the hostname is either a valid IPv4 or IPv6 address
+        let is_ipv4 = Ipv4Addr::from_str(hostname).is_ok();
+        let is_ipv6 = Ipv6Addr::from_str(hostname).is_ok();
+        let localhost_v4 = IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1));
+        let localhost_v6 = IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
+        if !is_ipv4 && !is_ipv6 && "127.0.0.1".parse() != Ok(localhost_v4) && "::1".parse() != Ok(localhost_v6) {
+             return Err(ErrorKind::InvalidArgument {
+                    message: format!("invalid hostname: \"{}\"", hostname),
+                }
+                .into())
+        }
 
-                if port == 0 {
+        // Validate port
+        let port = match port_str {
+            None => {
+                return Err(ErrorKind::InvalidArgument {
+                    message: format!("invalid server address: \"{}\"; port is required", address),
+                }.into())
+            }
+            Some(port_str) => match port_str.parse::<u16>() {
+                Ok(0) => {
                     return Err(ErrorKind::InvalidArgument {
-                        message: format!(
-                            "invalid server address: \"{}\"; port must be non-zero",
-                            address
-                        ),
-                    }
-                    .into());
+                        message: format!("invalid server address: \"{}\"; port cannot be 0", address),
+                    }.into())
                 }
-                if parts.next().is_some() {
+                Ok(port) => port,
+                Err(_) => {
                     return Err(ErrorKind::InvalidArgument {
-                        message: format!(
-                            "address \"{}\" contains more than one unescaped ':'",
-                            address
-                        ),
-                    }
-                    .into());
+                        message: format!("invalid server address: \"{}\"; invalid port number", address),
+                    }.into())
                 }
-
-                Some(port)
             }
-            None => None,
         };
 
         Ok(ServerAddress::Tcp {
             host: hostname.to_lowercase(),
-            port,
+            port: Some(port),
         })
     }
 
@@ -266,6 +281,7 @@ impl ServerAddress {
             Self::Unix { path } => path.to_string_lossy(),
         }
     }
+    }
 }
 
 impl fmt::Display for ServerAddress {