Fixed #47, support any TAP device name

CHANGELOG

@@ -7,6 +7,7 @@ CHANGES:
 
 20xx-xx-xx: x.y.z
 	- Fixed tunnel not working on Windows.
+	- Any device name is now supported on Windows, fixes #47.
 
 2009-06-01: 0.5.2 "WifiFree"
 	- Fixed client segfault on OS X, #57

README-win32.txt

@@ -15,14 +15,12 @@ Extra README file for Win32 related stuff
 
 2. Have one TAP32 interface installed
 
-3. Name the interface "dns"
+3. Make sure the interface does not have a default gateway set
 
-4. Make sure the interface does not have a default gateway set
-
-5. Run iodine/iodined as normal (see the main README file).
+4. Run iodine/iodined as normal (see the main README file).
    You may have to run it as administrator depending on user privileges.
 
-6. Enjoy!
+5. Enjoy!
 
 
 == Building on Windows:
@@ -50,7 +48,6 @@ cross-compile.
 == Results of crappy Win32 API:
 The following fixable limitations apply:
 - Exactly one TAP32 interface must be installed
-- The TAP32 interface must be named "dns" and be version 0801 or 0901
 - Server cannot read packet destination address
 
 The following (probably) un-fixable limitations apply:

src/iodine.c

@@ -740,7 +740,8 @@ handshake_raw_udp(int dns_fd, int seed)
 		r = select(dns_fd + 1, &fds, NULL, NULL, &tv);
 
 		if(r > 0) {
-			len = read(dns_fd, in, sizeof(in));
+			/* recv() needed for windows, dont change to read() */
+			len = recv(dns_fd, in, sizeof(in), 0);
 			if (len >= (17 + RAW_HDR_LEN)) {
 				char hash[16];
 				login_calculate(hash, 16, password, seed - 1);

src/tun.c

@@ -37,6 +37,7 @@ struct tun_data data;
 #define TAP_IOCTL_SET_MEDIA_STATUS TAP_CONTROL_CODE(6, METHOD_BUFFERED)
 
 #define TAP_ADAPTER_KEY "SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
+#define NETWORK_KEY "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
 #define TAP_DEVICE_SPACE "\\\\.\\Global\\"
 #define TAP_VERSION_ID_0801 "tap0801"
 #define TAP_VERSION_ID_0901 "tap0901"
@@ -53,7 +54,7 @@ struct tun_data data;
 #include "tun.h"
 #include "common.h"
 
-char if_name[50];
+char if_name[250];
 
 #ifndef WINDOWS32
 #ifdef LINUX
@@ -227,6 +228,36 @@ next:
 	RegCloseKey(adapter_key);
 }
 
+static void
+get_name(char *dev_name)
+{
+	char path[256];
+	char name_str[256] = "Name";
+	LONG status;
+	HKEY conn_key;
+	DWORD len;
+	DWORD datatype;
+
+	memset(if_name, 0, sizeof(if_name));
+
+	snprintf(path, sizeof(path), NETWORK_KEY "\\%s\\Connection", dev_name);
+	status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, path, 0, KEY_READ, &conn_key);
+	printf("%s ?? %s\n", path, dev_name);
+	if (status != ERROR_SUCCESS) {
+		fprintf(stderr, "Could not look up name of interface %s: error opening key\n", dev_name);
+		RegCloseKey(conn_key);
+		return;
+	}
+	len = sizeof(if_name);
+	status = RegQueryValueEx(conn_key, name_str, NULL, &datatype, (LPBYTE)if_name, &len);
+	if (status != ERROR_SUCCESS || datatype != REG_SZ) {
+		fprintf(stderr, "Could not look up name of interface %s: error reading value\n", dev_name);
+		RegCloseKey(conn_key);
+		return;
+	}
+	RegCloseKey(conn_key);
+}
+
 DWORD WINAPI tun_reader(LPVOID arg)
 {
 	struct tun_data *tun = arg;
@@ -265,8 +296,9 @@ open_tun(const char *tun_device)
 
 	memset(adapter, 0, sizeof(adapter));
 	get_device(adapter, sizeof(adapter));
+	get_name(adapter); /* Copies interface 'human name' to if_name */
 
-	if (strlen(adapter) == 0) {
+	if (strlen(adapter) == 0 || strlen(if_name) == 0) {
 		warnx("No TAP adapters found. See README-win32.txt for help.\n");
 		return -1;
 	}
@@ -278,9 +310,6 @@ open_tun(const char *tun_device)
 		return -1;
 	}
 
-	/* TODO get name of interface */
-	strncpy(if_name, "dns", MIN(4, sizeof(if_name)));
-
 	/* Use a UDP connection to forward packets from tun,
 	 * so we can still use select() in main code.
 	 * A thread does blocking reads on tun device and