config-win32: add support for if_nametoindex and getsockname

Closes https://github.com/curl/curl/pull/3923

lib/config-win32.h

@@ -154,6 +154,11 @@
 #define HAVE_WS2TCPIP_H 1
 #endif
 
+/* Define if you have the <Iphlpapi.h> header file. */
+#ifndef __SALFORDC__
+#define HAVE_IPHLPAPI_H 1
+#endif
+
 /* ---------------------------------------------------------------- */
 /*                        OTHER HEADER INFO                         */
 /* ---------------------------------------------------------------- */
@@ -188,6 +193,9 @@
 /* Define to 1 if you have the `getpeername' function. */
 #define HAVE_GETPEERNAME 1
 
+/* Define to 1 if you have the getsockname function. */
+#define HAVE_GETSOCKNAME 1
+
 /* Define if you have the gethostbyaddr function. */
 #define HAVE_GETHOSTBYADDR 1
 
@@ -582,8 +590,9 @@ Vista
 #  endif
 #endif
 
-/* Availability of freeaddrinfo, getaddrinfo and getnameinfo functions is
-   quite convoluted, compiler dependent and even build target dependent. */
+/* Availability of freeaddrinfo, getaddrinfo, getnameinfo and if_nametoindex
+   functions is quite convoluted, compiler dependent and even build target
+   dependent. */
 #if defined(HAVE_WS2TCPIP_H)
 #  if defined(__POCC__)
 #    define HAVE_FREEADDRINFO           1
@@ -602,6 +611,11 @@ Vista
 #    define HAVE_GETNAMEINFO            1
 #  endif
 #endif
+#if defined(HAVE_IPHLPAPI_H)
+  #if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600)
+    #define HAVE_IF_NAMETOINDEX 1
+  #endif
+#endif
 
 #if defined(__POCC__)
 #  ifndef _MSC_VER

lib/url.c

@@ -34,10 +34,12 @@
 #ifdef HAVE_NET_IF_H
 #include <net/if.h>
 #endif
+#ifdef HAVE_IPHLPAPI_H
+#include <Iphlpapi.h>
+#endif
 #ifdef HAVE_SYS_IOCTL_H
 #include <sys/ioctl.h>
 #endif
-
 #ifdef HAVE_SYS_PARAM_H
 #include <sys/param.h>
 #endif