Convert closesocket 'compat wrapper' to function in netbase

Simpler alternative to #4348.

The current setup with closesocket() is strange. It poses
as a compatibility wrapper but adds functionality.

Rename it and make it a documented utility function in netbase.

Code movement only, zero effect on the functionality.

1 files changed, 33 insertions, 20 deletions

diff --git a/src/netbase.cpp b/src/netbase.cpp
index 067cfa024b..e9f3515456 100644
--- a/src/netbase.cpp
+++ b/src/netbase.cpp
@@ -218,7 +218,7 @@ bool static Socks5(string strDest, int port, SOCKET& hSocket)
     LogPrintf("SOCKS5 connecting %s\n", strDest);
     if (strDest.size() > 255)
     {
-        closesocket(hSocket);
+        CloseSocket(hSocket);
         return error("Hostname too long");
     }
     char pszSocks5Init[] = "\5\1\0";
@@ -227,18 +227,18 @@ bool static Socks5(string strDest, int port, SOCKET& hSocket)
     ssize_t ret = send(hSocket, pszSocks5Init, nSize, MSG_NOSIGNAL);
     if (ret != nSize)
     {
-        closesocket(hSocket);
+        CloseSocket(hSocket);
         return error("Error sending to proxy");
     }
     char pchRet1[2];
     if (recv(hSocket, pchRet1, 2, 0) != 2)
     {
-        closesocket(hSocket);
+        CloseSocket(hSocket);
         return error("Error reading proxy response");
     }
     if (pchRet1[0] != 0x05 || pchRet1[1] != 0x00)
     {
-        closesocket(hSocket);
+        CloseSocket(hSocket);
         return error("Proxy failed to initialize");
     }
     string strSocks5("\5\1");
@@ -250,23 +250,23 @@ bool static Socks5(string strDest, int port, SOCKET& hSocket)
     ret = send(hSocket, strSocks5.c_str(), strSocks5.size(), MSG_NOSIGNAL);
     if (ret != (ssize_t)strSocks5.size())
     {
-        closesocket(hSocket);
+        CloseSocket(hSocket);
         return error("Error sending to proxy");
     }
     char pchRet2[4];
     if (recv(hSocket, pchRet2, 4, 0) != 4)
     {
-        closesocket(hSocket);
+        CloseSocket(hSocket);
         return error("Error reading proxy response");
     }
     if (pchRet2[0] != 0x05)
     {
-        closesocket(hSocket);
+        CloseSocket(hSocket);
         return error("Proxy failed to accept request");
     }
     if (pchRet2[1] != 0x00)
     {
-        closesocket(hSocket);
+        CloseSocket(hSocket);
         switch (pchRet2[1])
         {
             case 0x01: return error("Proxy error: general failure");
@@ -282,7 +282,7 @@ bool static Socks5(string strDest, int port, SOCKET& hSocket)
     }
     if (pchRet2[2] != 0x00)
     {
-        closesocket(hSocket);
+        CloseSocket(hSocket);
         return error("Error: malformed proxy response");
     }
     char pchRet3[256];
@@ -294,23 +294,23 @@ bool static Socks5(string strDest, int port, SOCKET& hSocket)
         {
             ret = recv(hSocket, pchRet3, 1, 0) != 1;
             if (ret) {
-                closesocket(hSocket);
+                CloseSocket(hSocket);
                 return error("Error reading from proxy");
             }
             int nRecv = pchRet3[0];
             ret = recv(hSocket, pchRet3, nRecv, 0) != nRecv;
             break;
         }
-        default: closesocket(hSocket); return error("Error: malformed proxy response");
+        default: CloseSocket(hSocket); return error("Error: malformed proxy response");
     }
     if (ret)
     {
-        closesocket(hSocket);
+        CloseSocket(hSocket);
         return error("Error reading from proxy");
     }
     if (recv(hSocket, pchRet3, 2, 0) != 2)
     {
-        closesocket(hSocket);
+        CloseSocket(hSocket);
         return error("Error reading from proxy");
     }
     LogPrintf("SOCKS5 connected %s\n", strDest);
@@ -344,7 +344,7 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe
     if (fcntl(hSocket, F_SETFL, fFlags | O_NONBLOCK) == -1)
 #endif
     {
-        closesocket(hSocket);
+        CloseSocket(hSocket);
         return false;
     }
 
@@ -365,13 +365,13 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe
             if (nRet == 0)
             {
                 LogPrint("net", "connection to %s timeout\n", addrConnect.ToString());
-                closesocket(hSocket);
+                CloseSocket(hSocket);
                 return false;
             }
             if (nRet == SOCKET_ERROR)
             {
                 LogPrintf("select() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
-                closesocket(hSocket);
+                CloseSocket(hSocket);
                 return false;
             }
             socklen_t nRetSize = sizeof(nRet);
@@ -382,13 +382,13 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe
 #endif
             {
                 LogPrintf("getsockopt() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
-                closesocket(hSocket);
+                CloseSocket(hSocket);
                 return false;
             }
             if (nRet != 0)
             {
                 LogPrintf("connect() to %s failed after select(): %s\n", addrConnect.ToString(), NetworkErrorString(nRet));
-                closesocket(hSocket);
+                CloseSocket(hSocket);
                 return false;
             }
         }
@@ -399,7 +399,7 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe
 #endif
         {
             LogPrintf("connect() to %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
-            closesocket(hSocket);
+            CloseSocket(hSocket);
             return false;
         }
     }
@@ -415,7 +415,7 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe
     if (fcntl(hSocket, F_SETFL, fFlags & ~O_NONBLOCK) == SOCKET_ERROR)
 #endif
     {
-        closesocket(hSocket);
+        CloseSocket(hSocket);
         return false;
     }
 
@@ -1258,3 +1258,16 @@ std::string NetworkErrorString(int err)
     return strprintf("%s (%d)", s, err);
 }
 #endif
+
+bool CloseSocket(SOCKET& hSocket)
+{
+    if (hSocket == INVALID_SOCKET)
+        return false;
+#ifdef WIN32
+    int ret = closesocket(hSocket);
+#else
+    int ret = close(hSocket);
+#endif
+    hSocket = INVALID_SOCKET;
+    return ret != SOCKET_ERROR;
+}