FreeBSD works, and some documentation fixes.

BUILDING.md

@@ -1,17 +1,18 @@
-Building ZeroTier One on different platforms:
+Building ZeroTier One From Source
+======
 
-(See RUNNING.txt for what to do next.)
+(See RUNNING.md for what to do next.)
 
 Developers note: there is currently no management of dependencies on *nix
 platforms, so you should make clean ; make if you change a header. Will
 do this eventually.
 
--- Linux
+### Linux and FreeBSD
 
 Just type 'make'. You'll need gcc and g++ installed, but ZeroTier One requires
 no other third party libraries beyond the standard libc, libstdc++, and libm.
 
--- MacOS
+### MacOS
 
 make
 
@@ -32,6 +33,7 @@ be symbolically linked into "Qt" in the parent directory of the ZeroTier
 One source tree. Then you can type "make mac-ui" and the UI should build.
 You can also load the UI in Qt Creator and build/test it that way.
 
--- Windows
+### Windows
 
-Here be dragons.
+There's a Visual Studio 2012 solution file in windows/ that can be used.
+I've never tried it with MinGW, but theoretically this should be possible.

RUNNING.md

@@ -1,10 +1,13 @@
-This guide is for those building and running from source. See BUILDING.txt
+Running ZeroTier One
+======
+
+This guide is for those building and running from source. See BUILDING.md
 first.
 
 The wiki at GitHub contains several pages that are probably also of interest:
   https://github.com/zerotier/ZeroTierOne/wiki
 
---- MacOS
+### MacOS
 
 On Mac, the default ZeroTier home is:
 
@@ -24,7 +27,7 @@ If run with no options, it will use the default home directory above.
 
 sudo ./zerotier-one &
 
---- LINUX
+### LINUX
 
 On Linux, the default ZeroTier home is:
 
@@ -56,11 +59,18 @@ sudo ufw allow 9993/udp
 
 You should now be able to ping and browse earth.zerotier.net
 
---- WINDOWS
+### FreeBSD
 
-A windows port is in progress.
+FreeBSD is identical to Linux except that the default home is
+/var/db/zerotier-one instead of /var/lib.
 
---- ONCE IT'S RUNNING:
+### WINDOWS
+
+Run zerotier-one.exe -h for help. There's a command to install the current
+binary as a service to run it that way, and another option to run it from
+the Windows console.
+
+### Once you're up and running...
 
 To use the command line interface, see this guide:
   https://github.com/zerotier/ZeroTierOne/wiki/Command-Line-Interface
@@ -68,7 +78,7 @@ To use the command line interface, see this guide:
 If you want to test by joining the Earth network, try:
   sudo ./zerotier-cli join 8056c2e21c000001
 
-An interface called 'zt0' should appear and should get an IP address in
+An interface called 'zt####' should appear and should get an IP address in
 the 28.0.0.0/7 range (28.* or 29.*) within a few seconds or so. Then try
 pinging earth.zerotier.net or navigating to http://earth.zerotier.net/ in
 a web browser.

node/Defaults.cpp

@@ -51,14 +51,24 @@ static inline std::string _mkDefaultHomePath()
 #ifdef __UNIX_LIKE__
 
 #ifdef __APPLE__
+	// /Library/... on Apple
 	return std::string("/Library/Application Support/ZeroTier/One");
 #else
+
+#ifdef __FreeBSD__
+	// FreeBSD likes /var/db instead of /var/lib
+	return std::string("/var/db/zerotier-one");
+#else
+	// Use /var/lib for Linux and other *nix
 	return std::string("/var/lib/zerotier-one");
 #endif
 
+#endif
+
 #else // not __UNIX_LIKE__
 
 #ifdef __WINDOWS__
+	// Look up app data folder on Windows, e.g. C:\ProgramData\...
 	char buf[16384];
 	if (SUCCEEDED(SHGetFolderPathA(NULL,CSIDL_COMMON_APPDATA,NULL,0,buf)))
 		return (std::string(buf) + "\\ZeroTier\\One");

osnet/BSDEthernetTap.cpp

@@ -117,10 +117,11 @@ BSDEthernetTap::BSDEthernetTap(
 
 	// On BSD we create taps and they can have high numbers, so use ones starting
 	// at 9993 to not conflict with other stuff. Then we rename it to zt<base32 of nwid>
-	for(int i=9993;i<500;++i) {
+	std::map<std::string,bool> devFiles(Utils::listDirectory("/dev"));
+	for(int i=9993;i<(9993+128);++i) {
 		Utils::snprintf(tmpdevname,sizeof(tmpdevname),"tap%d",i);
 		Utils::snprintf(devpath,sizeof(devpath),"/dev/%s",tmpdevname);
-		if (stat(devpath,&stattmp)) {
+		if (devFiles.count(std::string(tmpdevname)) == 0) {
 			long cpid = (long)vfork();
 			if (cpid == 0) {
 				::execl("/sbin/ifconfig","/sbin/ifconfig",tmpdevname,"create",(const char *)0);
@@ -146,6 +147,8 @@ BSDEthernetTap::BSDEthernetTap(
 				if (_fd > 0)
 					break;
 				else throw std::runtime_error("unable to open created tap device");
+			} else {
+				throw std::runtime_error("cannot find /dev node for newly created tap device");
 			}
 		}
 	}
@@ -190,6 +193,15 @@ BSDEthernetTap::~BSDEthernetTap()
 	::close(_fd);
 	::close(_shutdownSignalPipe[0]);
 	::close(_shutdownSignalPipe[1]);
+
+	long cpid = (long)vfork();
+	if (cpid == 0) {
+		::execl("/sbin/ifconfig","/sbin/ifconfig",_dev.c_str(),"destroy",(const char *)0);
+		::_exit(-1);
+	} else if (cpid > 0) {
+		int exitcode = -1;
+		::waitpid(cpid,&exitcode,0);
+	}
 }
 
 void BSDEthernetTap::setEnabled(bool en)