From 57469e62d95605f240097a963ce09d8a39cab3b6 Mon Sep 17 00:00:00 2001
From: Daniel Bevenius <daniel.bevenius@gmail.com>
Date: Wed, 13 Feb 2019 04:59:48 +0100
Subject: [PATCH] src: extract common sockaddr creation code

This commit extracts code to create sockaddr which is shared by both
UDPWrap::DoBind and UDPWrap::DoSend.

PR-URL: https://github.com/nodejs/node/pull/26070
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
---
 src/udp_wrap.cc | 51 ++++++++++++++++++-------------------------------
 1 file changed, 19 insertions(+), 32 deletions(-)

diff --git a/src/udp_wrap.cc b/src/udp_wrap.cc
index 04d65c3635737e..e17dea0e0e31df 100644
--- a/src/udp_wrap.cc
+++ b/src/udp_wrap.cc
@@ -165,6 +165,19 @@ void UDPWrap::GetFD(const FunctionCallbackInfo<Value>& args) {
   args.GetReturnValue().Set(fd);
 }
 
+int sockaddr_for_family(int address_family,
+                        const char* address,
+                        const unsigned short port,
+                        struct sockaddr_storage* addr) {
+  switch (address_family) {
+  case AF_INET:
+    return uv_ip4_addr(address, port, reinterpret_cast<sockaddr_in*>(addr));
+  case AF_INET6:
+    return uv_ip6_addr(address, port, reinterpret_cast<sockaddr_in6*>(addr));
+  default:
+    CHECK(0 && "unexpected address family");
+  }
+}
 
 void UDPWrap::DoBind(const FunctionCallbackInfo<Value>& args, int family) {
   UDPWrap* wrap;
@@ -181,24 +194,11 @@ void UDPWrap::DoBind(const FunctionCallbackInfo<Value>& args, int family) {
   if (!args[1]->Uint32Value(ctx).To(&port) ||
       !args[2]->Uint32Value(ctx).To(&flags))
     return;
-  char addr[sizeof(sockaddr_in6)];
-  int err;
-
-  switch (family) {
-  case AF_INET:
-    err = uv_ip4_addr(*address, port, reinterpret_cast<sockaddr_in*>(&addr));
-    break;
-  case AF_INET6:
-    err = uv_ip6_addr(*address, port, reinterpret_cast<sockaddr_in6*>(&addr));
-    break;
-  default:
-    CHECK(0 && "unexpected address family");
-    ABORT();
-  }
-
+  struct sockaddr_storage addr_storage;
+  int err = sockaddr_for_family(family, address.out(), port, &addr_storage);
   if (err == 0) {
     err = uv_udp_bind(&wrap->handle_,
-                      reinterpret_cast<const sockaddr*>(&addr),
+                      reinterpret_cast<const sockaddr*>(&addr_storage),
                       flags);
   }
 
@@ -369,27 +369,14 @@ void UDPWrap::DoSend(const FunctionCallbackInfo<Value>& args, int family) {
 
   req_wrap->msg_size = msg_size;
 
-  char addr[sizeof(sockaddr_in6)];
-  int err;
-
-  switch (family) {
-  case AF_INET:
-    err = uv_ip4_addr(*address, port, reinterpret_cast<sockaddr_in*>(&addr));
-    break;
-  case AF_INET6:
-    err = uv_ip6_addr(*address, port, reinterpret_cast<sockaddr_in6*>(&addr));
-    break;
-  default:
-    CHECK(0 && "unexpected address family");
-    ABORT();
-  }
-
+  struct sockaddr_storage addr_storage;
+  int err = sockaddr_for_family(family, address.out(), port, &addr_storage);
   if (err == 0) {
     err = req_wrap->Dispatch(uv_udp_send,
                              &wrap->handle_,
                              *bufs,
                              count,
-                             reinterpret_cast<const sockaddr*>(&addr),
+                             reinterpret_cast<const sockaddr*>(&addr_storage),
                              OnSend);
   }