Shelve pcap-with-bridge OSX experiment -- apparently pcap_inject does not work with bridge devices. Still have to use a kext.

attic/OSXEthernetTap.cpp.pcap-with-bridge-test

@@ -0,0 +1,651 @@
+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2015  ZeroTier, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * --
+ *
+ * ZeroTier may be used and distributed under the terms of the GPLv3, which
+ * are available at: http://www.gnu.org/licenses/gpl-3.0.html
+ *
+ * If you would like to embed ZeroTier into a commercial application or
+ * redistribute it in a modified binary form, please contact ZeroTier Networks
+ * LLC. Start here: http://www.zerotier.com/
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <unistd.h>
+#include <signal.h>
+
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/wait.h>
+#include <sys/select.h>
+#include <sys/cdefs.h>
+#include <sys/uio.h>
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <net/route.h>
+#include <net/if.h>
+#include <net/if_arp.h>
+#include <net/if_dl.h>
+#include <net/if_media.h>
+#include <netinet6/in6_var.h>
+#include <netinet/in_var.h>
+#include <netinet/icmp6.h>
+
+#include <pcap/pcap.h>
+
+// OSX compile fix... in6_var defines this in a struct which namespaces it for C++ ... why?!?
+struct prf_ra {
+	u_char onlink : 1;
+	u_char autonomous : 1;
+	u_char reserved : 6;
+} prf_ra;
+
+#include <netinet6/nd6.h>
+#include <ifaddrs.h>
+
+// These are KERNEL_PRIVATE... why?
+#ifndef SIOCAUTOCONF_START
+#define SIOCAUTOCONF_START _IOWR('i', 132, struct in6_ifreq)    /* accept rtadvd on this interface */
+#endif
+#ifndef SIOCAUTOCONF_STOP
+#define SIOCAUTOCONF_STOP _IOWR('i', 133, struct in6_ifreq)    /* stop accepting rtadv for this interface */
+#endif
+
+#ifndef ETH_ALEN
+#define ETH_ALEN 6
+#endif
+
+// --------------------------------------------------------------------------
+// --------------------------------------------------------------------------
+// This source is from:
+// http://www.opensource.apple.com/source/Libinfo/Libinfo-406.17/gen.subproj/getifmaddrs.c?txt
+// It's here because OSX 10.6 does not have this convenience function.
+
+#define	SALIGN	(sizeof(uint32_t) - 1)
+#define	SA_RLEN(sa)	((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : \
+(SALIGN + 1))
+#define	MAX_SYSCTL_TRY	5
+#define	RTA_MASKS	(RTA_GATEWAY | RTA_IFP | RTA_IFA)
+
+/* FreeBSD uses NET_RT_IFMALIST and RTM_NEWMADDR from <sys/socket.h> */
+/* We can use NET_RT_IFLIST2 and RTM_NEWMADDR2 on Darwin */
+//#define DARWIN_COMPAT
+
+//#ifdef DARWIN_COMPAT
+#define GIM_SYSCTL_MIB NET_RT_IFLIST2
+#define GIM_RTM_ADDR RTM_NEWMADDR2
+//#else
+//#define GIM_SYSCTL_MIB NET_RT_IFMALIST
+//#define GIM_RTM_ADDR RTM_NEWMADDR
+//#endif
+
+// Not in 10.6 includes so use our own
+struct _intl_ifmaddrs {
+	struct _intl_ifmaddrs *ifma_next;
+	struct sockaddr *ifma_name;
+	struct sockaddr *ifma_addr;
+	struct sockaddr *ifma_lladdr;
+};
+
+static inline int _intl_getifmaddrs(struct _intl_ifmaddrs **pif)
+{
+	int icnt = 1;
+	int dcnt = 0;
+	int ntry = 0;
+	size_t len;
+	size_t needed;
+	int mib[6];
+	int i;
+	char *buf;
+	char *data;
+	char *next;
+	char *p;
+	struct ifma_msghdr2 *ifmam;
+	struct _intl_ifmaddrs *ifa, *ift;
+	struct rt_msghdr *rtm;
+	struct sockaddr *sa;
+
+	mib[0] = CTL_NET;
+	mib[1] = PF_ROUTE;
+	mib[2] = 0;             /* protocol */
+	mib[3] = 0;             /* wildcard address family */
+	mib[4] = GIM_SYSCTL_MIB;
+	mib[5] = 0;             /* no flags */
+	do {
+		if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
+			return (-1);
+		if ((buf = (char *)malloc(needed)) == NULL)
+			return (-1);
+		if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
+			if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) {
+				free(buf);
+				return (-1);
+			}
+			free(buf);
+			buf = NULL;
+		}
+	} while (buf == NULL);
+
+	for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
+		rtm = (struct rt_msghdr *)(void *)next;
+		if (rtm->rtm_version != RTM_VERSION)
+			continue;
+		switch (rtm->rtm_type) {
+			case GIM_RTM_ADDR:
+				ifmam = (struct ifma_msghdr2 *)(void *)rtm;
+				if ((ifmam->ifmam_addrs & RTA_IFA) == 0)
+					break;
+				icnt++;
+				p = (char *)(ifmam + 1);
+				for (i = 0; i < RTAX_MAX; i++) {
+					if ((RTA_MASKS & ifmam->ifmam_addrs &
+						 (1 << i)) == 0)
+						continue;
+					sa = (struct sockaddr *)(void *)p;
+					len = SA_RLEN(sa);
+					dcnt += len;
+					p += len;
+				}
+				break;
+		}
+	}
+
+	data = (char *)malloc(sizeof(struct _intl_ifmaddrs) * icnt + dcnt);
+	if (data == NULL) {
+		free(buf);
+		return (-1);
+	}
+
+	ifa = (struct _intl_ifmaddrs *)(void *)data;
+	data += sizeof(struct _intl_ifmaddrs) * icnt;
+
+	memset(ifa, 0, sizeof(struct _intl_ifmaddrs) * icnt);
+	ift = ifa;
+
+	for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
+		rtm = (struct rt_msghdr *)(void *)next;
+		if (rtm->rtm_version != RTM_VERSION)
+			continue;
+
+		switch (rtm->rtm_type) {
+			case GIM_RTM_ADDR:
+				ifmam = (struct ifma_msghdr2 *)(void *)rtm;
+				if ((ifmam->ifmam_addrs & RTA_IFA) == 0)
+					break;
+
+				p = (char *)(ifmam + 1);
+				for (i = 0; i < RTAX_MAX; i++) {
+					if ((RTA_MASKS & ifmam->ifmam_addrs &
+						 (1 << i)) == 0)
+						continue;
+					sa = (struct sockaddr *)(void *)p;
+					len = SA_RLEN(sa);
+					switch (i) {
+						case RTAX_GATEWAY:
+							ift->ifma_lladdr =
+							(struct sockaddr *)(void *)data;
+							memcpy(data, p, len);
+							data += len;
+							break;
+
+						case RTAX_IFP:
+							ift->ifma_name =
+							(struct sockaddr *)(void *)data;
+							memcpy(data, p, len);
+							data += len;
+							break;
+
+						case RTAX_IFA:
+							ift->ifma_addr =
+							(struct sockaddr *)(void *)data;
+							memcpy(data, p, len);
+							data += len;
+							break;
+
+						default:
+							data += len;
+							break;
+					}
+					p += len;
+				}
+				ift->ifma_next = ift + 1;
+				ift = ift->ifma_next;
+				break;
+		}
+	}
+
+	free(buf);
+
+	if (ift > ifa) {
+		ift--;
+		ift->ifma_next = NULL;
+		*pif = ifa;
+	} else {
+		*pif = NULL;
+		free(ifa);
+	}
+	return (0);
+}
+
+static inline void _intl_freeifmaddrs(struct _intl_ifmaddrs *ifmp)
+{
+	free(ifmp);
+}
+
+// --------------------------------------------------------------------------
+// --------------------------------------------------------------------------
+
+#include <string>
+#include <map>
+#include <set>
+#include <algorithm>
+
+#include "../node/Constants.hpp"
+#include "../node/Utils.hpp"
+#include "../node/Mutex.hpp"
+#include "../node/Dictionary.hpp"
+#include "OSUtils.hpp"
+#include "OSXEthernetTap.hpp"
+
+// ff:ff:ff:ff:ff:ff with no ADI
+static const ZeroTier::MulticastGroup _blindWildcardMulticastGroup(ZeroTier::MAC(0xff),0);
+
+static inline bool _setIpv6Stuff(const char *ifname,bool performNUD,bool acceptRouterAdverts)
+{
+	struct in6_ndireq nd;
+	struct in6_ifreq ifr;
+
+	int s = socket(AF_INET6,SOCK_DGRAM,0);
+	if (s <= 0)
+		return false;
+
+	memset(&nd,0,sizeof(nd));
+	strncpy(nd.ifname,ifname,sizeof(nd.ifname));
+
+	if (ioctl(s,SIOCGIFINFO_IN6,&nd)) {
+		close(s);
+		return false;
+	}
+
+	unsigned long oldFlags = (unsigned long)nd.ndi.flags;
+
+	if (performNUD)
+		nd.ndi.flags |= ND6_IFF_PERFORMNUD;
+	else nd.ndi.flags &= ~ND6_IFF_PERFORMNUD;
+
+	if (oldFlags != (unsigned long)nd.ndi.flags) {
+		if (ioctl(s,SIOCSIFINFO_FLAGS,&nd)) {
+			close(s);
+			return false;
+		}
+	}
+
+	memset(&ifr,0,sizeof(ifr));
+	strncpy(ifr.ifr_name,ifname,sizeof(ifr.ifr_name));
+	if (ioctl(s,acceptRouterAdverts ? SIOCAUTOCONF_START : SIOCAUTOCONF_STOP,&ifr)) {
+		close(s);
+		return false;
+	}
+
+	close(s);
+	return true;
+}
+
+namespace ZeroTier {
+
+static std::set<std::string> globalDeviceNames;
+static Mutex globalTapCreateLock;
+
+OSXEthernetTap::OSXEthernetTap(
+	const char *homePath,
+	const MAC &mac,
+	unsigned int mtu,
+	unsigned int metric,
+	uint64_t nwid,
+	const char *friendlyName,
+	void (*handler)(void *,uint64_t,const MAC &,const MAC &,unsigned int,unsigned int,const void *data,unsigned int len),
+	void *arg) :
+	_handler(handler),
+	_arg(arg),
+	_pcap((void *)0),
+	_nwid(nwid),
+	_mac(mac),
+	_homePath(homePath),
+	_mtu(mtu),
+	_metric(metric),
+	_enabled(true)
+{
+	char errbuf[PCAP_ERRBUF_SIZE];
+	char devname[64],ethaddr[64],mtustr[32],metstr[32],nwids[32];
+
+	Utils::snprintf(nwids,sizeof(nwids),"%.16llx",nwid);
+
+	if (mtu > 2800)
+		throw std::runtime_error("max tap MTU is 2800");
+
+	Mutex::Lock _gl(globalTapCreateLock);
+
+	std::string desiredDevice;
+	Dictionary devmap;
+	{
+		std::string devmapbuf;
+		if (OSUtils::readFile((_homePath + ZT_PATH_SEPARATOR_S + "devicemap").c_str(),devmapbuf)) {
+			devmap.fromString(devmapbuf);
+			desiredDevice = devmap.get(nwids,"");
+		}
+	}
+
+	if ((desiredDevice.length() >= 9)&&(desiredDevice.substr(0,6) == "bridge")) {
+		// length() >= 9 matches bridge### or bridge####
+		_dev = desiredDevice;
+	} else {
+		if (globalDeviceNames.size() >= (10000 - 128)) // sanity check... this would be nuts
+			throw std::runtime_error("too many devices!");
+		unsigned int pseudoBridgeNo = (unsigned int)((nwid ^ (nwid >> 32)) % (10000 - 128)) + 128; // range: bridge128 to bridge9999
+		sprintf(devname,"bridge%u",pseudoBridgeNo);
+		while (globalDeviceNames.count(std::string(devname)) > 0) {
+			++pseudoBridgeNo;
+			if (pseudoBridgeNo > 9999)
+				pseudoBridgeNo = 64;
+			sprintf(devname,"bridge%u",pseudoBridgeNo);
+		}
+		_dev = devname;
+	}
+
+	// Configure MAC address and MTU, bring interface up
+	long cpid = (long)vfork();
+	if (cpid == 0) {
+		::execl("/sbin/ifconfig","/sbin/ifconfig",_dev.c_str(),"create",(const char *)0);
+		::_exit(-1);
+	} else if (cpid > 0) {
+		int exitcode = -1;
+		::waitpid(cpid,&exitcode,0);
+		if (exitcode != 0)
+			throw std::runtime_error("ifconfig failure setting link-layer address and activating tap interface");
+	} else throw std::runtime_error("unable to fork()");
+	Utils::snprintf(ethaddr,sizeof(ethaddr),"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",(int)mac[0],(int)mac[1],(int)mac[2],(int)mac[3],(int)mac[4],(int)mac[5]);
+	Utils::snprintf(mtustr,sizeof(mtustr),"%u",_mtu);
+	Utils::snprintf(metstr,sizeof(metstr),"%u",_metric);
+	cpid = (long)vfork();
+	if (cpid == 0) {
+		::execl("/sbin/ifconfig","/sbin/ifconfig",_dev.c_str(),"lladdr",ethaddr,"mtu",mtustr,"metric",metstr,"up",(const char *)0);
+		::_exit(-1);
+	} else if (cpid > 0) {
+		int exitcode = -1;
+		::waitpid(cpid,&exitcode,0);
+		if (exitcode != 0)
+			throw std::runtime_error("ifconfig failure setting link-layer address and activating tap interface");
+	} else throw std::runtime_error("unable to fork()");
+
+	_setIpv6Stuff(_dev.c_str(),true,false);
+
+	_pcap = (void *)pcap_create(_dev.c_str(),errbuf);
+	if (!_pcap) {
+		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);
+		}
+		throw std::runtime_error((std::string("pcap_create() on new bridge device failed: ") + errbuf).c_str());
+	}
+	pcap_set_promisc(reinterpret_cast<pcap_t *>(_pcap),1);
+	pcap_set_timeout(reinterpret_cast<pcap_t *>(_pcap),120000);
+	pcap_set_immediate_mode(reinterpret_cast<pcap_t *>(_pcap),1);
+	if (pcap_set_buffer_size(reinterpret_cast<pcap_t *>(_pcap),1024 * 1024 * 16) != 0) // 16MB
+		fprintf(stderr,"WARNING: pcap_set_buffer_size() failed!\n");
+	if (pcap_set_snaplen(reinterpret_cast<pcap_t *>(_pcap),4096) != 0)
+		fprintf(stderr,"WARNING: pcap_set_snaplen() failed!\n");
+	if (pcap_activate(reinterpret_cast<pcap_t *>(_pcap)) != 0) {
+		pcap_close(reinterpret_cast<pcap_t *>(_pcap));
+		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);
+		}
+		throw std::runtime_error("pcap_activate() on new bridge device failed.");
+	}
+
+	globalDeviceNames.insert(_dev);
+
+	devmap[nwids] = _dev;
+	OSUtils::writeFile((_homePath + ZT_PATH_SEPARATOR_S + "devicemap").c_str(),devmap.toString());
+
+	_thread = Thread::start(this);
+}
+
+OSXEthernetTap::~OSXEthernetTap()
+{
+	_enabled = false;
+
+	Mutex::Lock _gl(globalTapCreateLock);
+	globalDeviceNames.erase(_dev);
+
+	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);
+		if (exitcode == 0) {
+			// Destroying the interface nukes pcap and terminates the thread.
+			Thread::join(_thread);
+		}
+	}
+
+	pcap_close(reinterpret_cast<pcap_t *>(_pcap));
+}
+
+static bool ___removeIp(const std::string &_dev,const InetAddress &ip)
+{
+	long cpid = (long)vfork();
+	if (cpid == 0) {
+		execl("/sbin/ifconfig","/sbin/ifconfig",_dev.c_str(),"inet",ip.toIpString().c_str(),"-alias",(const char *)0);
+		_exit(-1);
+	} else if (cpid > 0) {
+		int exitcode = -1;
+		waitpid(cpid,&exitcode,0);
+		return (exitcode == 0);
+	}
+	return false; // never reached, make compiler shut up about return value
+}
+
+bool OSXEthernetTap::addIp(const InetAddress &ip)
+{
+	if (!ip)
+		return false;
+
+	std::vector<InetAddress> allIps(ips());
+	if (std::binary_search(allIps.begin(),allIps.end(),ip))
+		return true;
+
+	// Remove and reconfigure if address is the same but netmask is different
+	for(std::vector<InetAddress>::iterator i(allIps.begin());i!=allIps.end();++i) {
+		if ((i->ipsEqual(ip))&&(i->netmaskBits() != ip.netmaskBits())) {
+			if (___removeIp(_dev,*i))
+				break;
+		}
+	}
+
+	long cpid = (long)vfork();
+	if (cpid == 0) {
+		::execl("/sbin/ifconfig","/sbin/ifconfig",_dev.c_str(),ip.isV4() ? "inet" : "inet6",ip.toString().c_str(),"alias",(const char *)0);
+		::_exit(-1);
+	} else if (cpid > 0) {
+		int exitcode = -1;
+		::waitpid(cpid,&exitcode,0);
+		return (exitcode == 0);
+	} // else return false...
+
+	return false;
+}
+
+bool OSXEthernetTap::removeIp(const InetAddress &ip)
+{
+	if (!ip)
+		return true;
+	std::vector<InetAddress> allIps(ips());
+	if (!std::binary_search(allIps.begin(),allIps.end(),ip)) {
+		if (___removeIp(_dev,ip))
+			return true;
+	}
+	return false;
+}
+
+std::vector<InetAddress> OSXEthernetTap::ips() const
+{
+	struct ifaddrs *ifa = (struct ifaddrs *)0;
+	if (getifaddrs(&ifa))
+		return std::vector<InetAddress>();
+
+	std::vector<InetAddress> r;
+
+	struct ifaddrs *p = ifa;
+	while (p) {
+		if ((!strcmp(p->ifa_name,_dev.c_str()))&&(p->ifa_addr)&&(p->ifa_netmask)&&(p->ifa_addr->sa_family == p->ifa_netmask->sa_family)) {
+			switch(p->ifa_addr->sa_family) {
+				case AF_INET: {
+					struct sockaddr_in *sin = (struct sockaddr_in *)p->ifa_addr;
+					struct sockaddr_in *nm = (struct sockaddr_in *)p->ifa_netmask;
+					r.push_back(InetAddress(&(sin->sin_addr.s_addr),4,Utils::countBits((uint32_t)nm->sin_addr.s_addr)));
+				}	break;
+				case AF_INET6: {
+					struct sockaddr_in6 *sin = (struct sockaddr_in6 *)p->ifa_addr;
+					struct sockaddr_in6 *nm = (struct sockaddr_in6 *)p->ifa_netmask;
+					uint32_t b[4];
+					memcpy(b,nm->sin6_addr.s6_addr,sizeof(b));
+					r.push_back(InetAddress(sin->sin6_addr.s6_addr,16,Utils::countBits(b[0]) + Utils::countBits(b[1]) + Utils::countBits(b[2]) + Utils::countBits(b[3])));
+				}	break;
+			}
+		}
+		p = p->ifa_next;
+	}
+
+	if (ifa)
+		freeifaddrs(ifa);
+
+	std::sort(r.begin(),r.end());
+	std::unique(r.begin(),r.end());
+
+	return r;
+}
+
+void OSXEthernetTap::put(const MAC &from,const MAC &to,unsigned int etherType,const void *data,unsigned int len)
+{
+	char putBuf[4096];
+	if ((len <= _mtu)&&(_enabled)) {
+		to.copyTo(putBuf,6);
+		from.copyTo(putBuf + 6,6);
+		*((uint16_t *)(putBuf + 12)) = htons((uint16_t)etherType);
+		memcpy(putBuf + 14,data,len);
+		len += 14;
+		int r = pcap_inject(reinterpret_cast<pcap_t *>(_pcap),putBuf,len);
+		if (r <= 0) {
+			printf("%s: pcap_inject() failed\n",_dev.c_str());
+			return;
+		}
+		printf("%s: inject %s -> %s etherType==%u len=%u r==%d\n",_dev.c_str(),from.toString().c_str(),to.toString().c_str(),etherType,len,r);
+	}
+}
+
+std::string OSXEthernetTap::deviceName() const
+{
+	return _dev;
+}
+
+void OSXEthernetTap::setFriendlyName(const char *friendlyName)
+{
+}
+
+void OSXEthernetTap::scanMulticastGroups(std::vector<MulticastGroup> &added,std::vector<MulticastGroup> &removed)
+{
+	std::vector<MulticastGroup> newGroups;
+
+	struct _intl_ifmaddrs *ifmap = (struct _intl_ifmaddrs *)0;
+	if (!_intl_getifmaddrs(&ifmap)) {
+		struct _intl_ifmaddrs *p = ifmap;
+		while (p) {
+			if (p->ifma_addr->sa_family == AF_LINK) {
+				struct sockaddr_dl *in = (struct sockaddr_dl *)p->ifma_name;
+				struct sockaddr_dl *la = (struct sockaddr_dl *)p->ifma_addr;
+				if ((la->sdl_alen == 6)&&(in->sdl_nlen <= _dev.length())&&(!memcmp(_dev.data(),in->sdl_data,in->sdl_nlen)))
+					newGroups.push_back(MulticastGroup(MAC(la->sdl_data + la->sdl_nlen,6),0));
+			}
+			p = p->ifma_next;
+		}
+		_intl_freeifmaddrs(ifmap);
+	}
+
+	std::vector<InetAddress> allIps(ips());
+	for(std::vector<InetAddress>::iterator ip(allIps.begin());ip!=allIps.end();++ip)
+		newGroups.push_back(MulticastGroup::deriveMulticastGroupForAddressResolution(*ip));
+
+	std::sort(newGroups.begin(),newGroups.end());
+	std::unique(newGroups.begin(),newGroups.end());
+
+	for(std::vector<MulticastGroup>::iterator m(newGroups.begin());m!=newGroups.end();++m) {
+		if (!std::binary_search(_multicastGroups.begin(),_multicastGroups.end(),*m))
+			added.push_back(*m);
+	}
+	for(std::vector<MulticastGroup>::iterator m(_multicastGroups.begin());m!=_multicastGroups.end();++m) {
+		if (!std::binary_search(newGroups.begin(),newGroups.end(),*m))
+			removed.push_back(*m);
+	}
+
+	_multicastGroups.swap(newGroups);
+}
+
+static void _pcapHandler(u_char *ptr,const struct pcap_pkthdr *hdr,const u_char *data)
+{
+	OSXEthernetTap *tap = reinterpret_cast<OSXEthernetTap *>(ptr);
+	if (hdr->caplen > 14) {
+		MAC to(data,6);
+		MAC from(data + 6,6);
+		if (from == tap->_mac) {
+			unsigned int etherType = ntohs(((const uint16_t *)data)[6]);
+			printf("%s: %s -> %s etherType==%u len==%u\n",tap->_dev.c_str(),from.toString().c_str(),to.toString().c_str(),etherType,(unsigned int)hdr->caplen);
+			// TODO: VLAN support
+			tap->_handler(tap->_arg,tap->_nwid,from,to,etherType,0,(const void *)(data + 14),hdr->len - 14);
+		}
+	}
+}
+
+void OSXEthernetTap::threadMain()
+	throw()
+{
+	pcap_loop(reinterpret_cast<pcap_t *>(_pcap),-1,&_pcapHandler,reinterpret_cast<u_char *>(this));
+}
+
+} // namespace ZeroTier

attic/OSXEthernetTap.hpp.pcap-with-bridge-test

@@ -0,0 +1,96 @@
+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2015  ZeroTier, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * --
+ *
+ * ZeroTier may be used and distributed under the terms of the GPLv3, which
+ * are available at: http://www.gnu.org/licenses/gpl-3.0.html
+ *
+ * If you would like to embed ZeroTier into a commercial application or
+ * redistribute it in a modified binary form, please contact ZeroTier Networks
+ * LLC. Start here: http://www.zerotier.com/
+ */
+
+#ifndef ZT_OSXETHERNETTAP_HPP
+#define ZT_OSXETHERNETTAP_HPP
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+#include "../node/Constants.hpp"
+#include "../node/MAC.hpp"
+#include "../node/InetAddress.hpp"
+#include "../node/MulticastGroup.hpp"
+
+#include "Thread.hpp"
+
+namespace ZeroTier {
+
+/**
+ * OSX Ethernet tap using ZeroTier kernel extension zt# devices
+ */
+class OSXEthernetTap
+{
+public:
+	OSXEthernetTap(
+		const char *homePath,
+		const MAC &mac,
+		unsigned int mtu,
+		unsigned int metric,
+		uint64_t nwid,
+		const char *friendlyName,
+		void (*handler)(void *,uint64_t,const MAC &,const MAC &,unsigned int,unsigned int,const void *,unsigned int),
+		void *arg);
+
+	~OSXEthernetTap();
+
+	inline void setEnabled(bool en) { _enabled = en; }
+	inline bool enabled() const { return _enabled; }
+	bool addIp(const InetAddress &ip);
+	bool removeIp(const InetAddress &ip);
+	std::vector<InetAddress> ips() const;
+	void put(const MAC &from,const MAC &to,unsigned int etherType,const void *data,unsigned int len);
+	std::string deviceName() const;
+	void setFriendlyName(const char *friendlyName);
+	void scanMulticastGroups(std::vector<MulticastGroup> &added,std::vector<MulticastGroup> &removed);
+
+	void threadMain()
+		throw();
+
+	// Private members of OSXEthernetTap have public visibility to be accessable
+	// from an internal bounce function; don't modify directly.
+	void (*_handler)(void *,uint64_t,const MAC &,const MAC &,unsigned int,unsigned int,const void *,unsigned int);
+	void *_arg;
+	void *_pcap; // pcap_t *
+	uint64_t _nwid;
+	MAC _mac;
+	Thread _thread;
+	std::string _homePath;
+	std::string _dev;
+	std::vector<MulticastGroup> _multicastGroups;
+	unsigned int _mtu;
+	unsigned int _metric;
+	volatile bool _enabled;
+};
+
+} // namespace ZeroTier
+
+#endif