From e6c8b8f480712d346c9b92f06217b4c56c15610c Mon Sep 17 00:00:00 2001
From: Murarth <murarth@gmail.com>
Date: Sun, 28 Dec 2014 15:44:25 -0700
Subject: Added `get_address_name`, an interface to `getnameinfo`

---
 src/libstd/sys/common/net.rs  | 38 ++++++++++++++++++++++++++++++++++++++
 src/libstd/sys/unix/mod.rs    |  1 +
 src/libstd/sys/windows/mod.rs |  1 +
 3 files changed, 40 insertions(+)

(limited to 'src/libstd/sys')

diff --git a/src/libstd/sys/common/net.rs b/src/libstd/sys/common/net.rs
index 382f6875b28..d1373db9a72 100644
--- a/src/libstd/sys/common/net.rs
+++ b/src/libstd/sys/common/net.rs
@@ -13,6 +13,7 @@ use self::InAddr::*;
 
 use alloc::arc::Arc;
 use libc::{mod, c_char, c_int};
+use c_str::CString;
 use mem;
 use num::Int;
 use ptr::{mod, null, null_mut};
@@ -290,6 +291,43 @@ pub fn get_host_addresses(host: Option<&str>, servname: Option<&str>,
     Ok(addrs)
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// get_address_name
+////////////////////////////////////////////////////////////////////////////////
+
+extern "system" {
+    fn getnameinfo(sa: *const libc::sockaddr, salen: libc::socklen_t,
+        host: *mut c_char, hostlen: libc::size_t,
+        serv: *mut c_char, servlen: libc::size_t,
+        flags: c_int) -> c_int;
+}
+
+const NI_MAXHOST: uint = 1025;
+
+pub fn get_address_name(addr: IpAddr) -> Result<String, IoError> {
+    let addr = SocketAddr{ip: addr, port: 0};
+
+    let mut storage: libc::sockaddr_storage = unsafe { mem::zeroed() };
+    let len = addr_to_sockaddr(addr, &mut storage);
+
+    let mut hostbuf = [0 as c_char, ..NI_MAXHOST];
+
+    let res = unsafe {
+        getnameinfo(&storage as *const _ as *const libc::sockaddr, len,
+            hostbuf.as_mut_ptr(), NI_MAXHOST as libc::size_t,
+            ptr::null_mut(), 0,
+            0)
+    };
+
+    if res != 0 {
+        return Err(last_gai_error(res));
+    }
+
+    unsafe {
+        Ok(CString::new(hostbuf.as_ptr(), false).as_str().unwrap().to_string())
+    }
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Timeout helpers
 //
diff --git a/src/libstd/sys/unix/mod.rs b/src/libstd/sys/unix/mod.rs
index f3babca3287..51526f1f023 100644
--- a/src/libstd/sys/unix/mod.rs
+++ b/src/libstd/sys/unix/mod.rs
@@ -56,6 +56,7 @@ pub mod udp;
 
 pub mod addrinfo {
     pub use sys_common::net::get_host_addresses;
+    pub use sys_common::net::get_address_name;
 }
 
 // FIXME: move these to c module
diff --git a/src/libstd/sys/windows/mod.rs b/src/libstd/sys/windows/mod.rs
index 6924687d8c4..4a8db917387 100644
--- a/src/libstd/sys/windows/mod.rs
+++ b/src/libstd/sys/windows/mod.rs
@@ -57,6 +57,7 @@ pub mod udp;
 
 pub mod addrinfo {
     pub use sys_common::net::get_host_addresses;
+    pub use sys_common::net::get_address_name;
 }
 
 // FIXME: move these to c module
-- 
cgit 1.4.1-3-g733a5