wsutil: add enumeration of local ip addresses in Windows.

Routine used by ssh-based extcaps.

Change-Id: I06d8e1e1444cd03a0508dc0c7cb91d340a451c58
Reviewed-on: https://code.wireshark.org/review/17308
Petri-Dish: Dario Lombardo <lomato@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Roland Knall <rknall@gmail.com>
Reviewed-by: João Valverde <j@v6e.pt>
Reviewed-by: Dario Lombardo <lomato@gmail.com>

1 files changed, 71 insertions, 2 deletions

diff --git a/wsutil/interface.c b/wsutil/interface.c
index 4cd8b5954c..11104f1eba 100644
--- a/wsutil/interface.c
+++ b/wsutil/interface.c
@@ -49,10 +49,18 @@
 	#include <ifaddrs.h>
 #endif
 
-GSList *local_interfaces_to_list(void)
+#ifdef _WIN32
+	#include <winsock2.h>
+	#include <iphlpapi.h>
+	#include <Ws2tcpip.h>
+#endif
+
+#define WORKING_BUFFER_SIZE 15000
+
+#ifdef HAVE_GETIFADDRS
+static GSList* local_interfaces_to_list_nix(void)
 {
 	GSList *interfaces = NULL;
-#ifdef HAVE_GETIFADDRS
 	struct ifaddrs *ifap;
 	struct ifaddrs *ifa;
 	int family;
@@ -99,9 +107,70 @@ GSList *local_interfaces_to_list(void)
 	}
 	freeifaddrs(ifap);
 end:
+	return interfaces;
+}
 #endif /* HAVE_GETIFADDRS */
+
+#ifdef _WIN32
+static GSList* local_interfaces_to_list_win(void)
+{
+	GSList *interfaces = NULL;
+	PIP_ADAPTER_ADDRESSES pAddresses = NULL;
+	ULONG outBufLen = WORKING_BUFFER_SIZE;
+	ULONG family = AF_UNSPEC;
+	PIP_ADAPTER_ADDRESSES pCurrAddresses = NULL;
+	PIP_ADAPTER_UNICAST_ADDRESS pUnicast = NULL;
+	char ip[100];
+	guint iplen = 100;
+
+	pAddresses = (IP_ADAPTER_ADDRESSES *)g_malloc0(outBufLen);
+	if (pAddresses == NULL)
+		return NULL;
+
+	if (GetAdaptersAddresses(family, 0, NULL, pAddresses, &outBufLen) != NO_ERROR)
+		goto end;
+
+	pCurrAddresses = pAddresses;
+	while (pCurrAddresses) {
+
+		for (pUnicast = pCurrAddresses->FirstUnicastAddress; pUnicast != NULL; pUnicast = pUnicast->Next) {
+			if (pUnicast->Address.lpSockaddr->sa_family == AF_INET) {
+				SOCKADDR_IN* sa_in = (SOCKADDR_IN *)pUnicast->Address.lpSockaddr;
+				ws_inet_ntop4(&(sa_in->sin_addr), ip, iplen);
+				if (!g_strcmp0(ip, "127.0.0.1"))
+					continue;
+				if (*ip)
+					interfaces = g_slist_prepend(interfaces, g_strdup(ip));
+			}
+			if (pUnicast->Address.lpSockaddr->sa_family == AF_INET6) {
+				SOCKADDR_IN6* sa_in6 = (SOCKADDR_IN6 *)pUnicast->Address.lpSockaddr;
+				ws_inet_ntop6(&(sa_in6->sin6_addr), ip, iplen);
+				if (!g_strcmp0(ip, "::1"))
+					continue;
+				if (*ip)
+					interfaces = g_slist_prepend(interfaces, g_strdup(ip));
+			}
+		}
+		pCurrAddresses = pCurrAddresses->Next;
+	}
+end:
+	if (pAddresses)
+		g_free(pAddresses);
+
 	return interfaces;
 }
+#endif /* _WIN32 */
+
+GSList* local_interfaces_to_list(void)
+{
+#if defined(_WIN32)
+	return local_interfaces_to_list_win();
+#elif defined(HAVE_GETIFADDRS)
+	return local_interfaces_to_list_nix();
+#else
+	return NULL;
+#endif
+}
 
 /*
  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html