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Diffstat (limited to 'node/osdep/OSXEthernetTap.cpp')
-rw-r--r--node/osdep/OSXEthernetTap.cpp698
1 files changed, 698 insertions, 0 deletions
diff --git a/node/osdep/OSXEthernetTap.cpp b/node/osdep/OSXEthernetTap.cpp
new file mode 100644
index 00000000..d5d02f40
--- /dev/null
+++ b/node/osdep/OSXEthernetTap.cpp
@@ -0,0 +1,698 @@
+/*
+ * ZeroTier One - Global Peer to Peer Ethernet
+ * Copyright (C) 2011-2014 ZeroTier Networks LLC
+ *
+ * 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 <netinet6/nd6.h>
+#include <ifaddrs.h>
+
+// OSX compile fix... in6_var defines this in a struct which namespaces it for C++
+struct prf_ra {
+ u_char onlink : 1;
+ u_char autonomous : 1;
+ u_char reserved : 6;
+} prf_ra;
+
+// 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
+
+// --------------------------------------------------------------------------
+// --------------------------------------------------------------------------
+// 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 "../Constants.hpp"
+#include "../Utils.hpp"
+#include "../Mutex.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 {
+
+// Only permit one tap to be opened concurrently across the entire process
+static Mutex __tapCreateLock;
+
+OSXEthernetTap::OSXEthernetTap(
+ const RuntimeEnvironment *renv,
+ const char *tryToGetDevice,
+ const MAC &mac,
+ unsigned int mtu,
+ void (*handler)(void *,const MAC &,const MAC &,unsigned int,const Buffer<4096> &),
+ void *arg)
+ throw(std::runtime_error) :
+ EthernetTap("OSXEthernetTap",mac,mtu,metric),
+ _r(renv),
+ _handler(handler),
+ _arg(arg),
+ _fd(0),
+ _enabled(true)
+{
+ char devpath[64],ethaddr[64],mtustr[16],tmp[4096];
+ struct stat stattmp;
+ Mutex::Lock _l(__tapCreateLock); // create only one tap at a time, globally
+
+ if (mtu > 2800)
+ throw std::runtime_error("max tap MTU is 2800");
+
+ // Check for existence of ZT tap devices, try to load module if not there
+ const char *kextload = UNIX_COMMANDS[ZT_MAC_KEXTLOAD_COMMAND];
+ if ((stat("/dev/zt0",&stattmp))&&(kextload)) {
+ strcpy(tmp,_r->homePath.c_str());
+ long kextpid = (long)vfork();
+ if (kextpid == 0) {
+ chdir(tmp);
+ execl(kextload,kextload,"-q","-repository",tmp,"tap.kext",(const char *)0);
+ _exit(-1);
+ } else if (kextpid > 0) {
+ int exitcode = -1;
+ waitpid(kextpid,&exitcode,0);
+ usleep(500);
+ } else throw std::runtime_error("unable to create subprocess with fork()");
+ }
+ if (stat("/dev/zt0",&stattmp))
+ throw std::runtime_error("/dev/zt# tap devices do not exist and unable to load kernel extension");
+
+ // Try to reopen the last device we had, if we had one and it's still unused.
+ bool recalledDevice = false;
+ if ((tryToGetDevice)&&(tryToGetDevice[0])) {
+ Utils::snprintf(devpath,sizeof(devpath),"/dev/%s",tryToGetDevice);
+ if (stat(devpath,&stattmp) == 0) {
+ _fd = ::open(devpath,O_RDWR);
+ if (_fd > 0) {
+ _dev = tryToGetDevice;
+ recalledDevice = true;
+ }
+ }
+ }
+
+ // Open the first unused tap device if we didn't recall a previous one.
+ if (!recalledDevice) {
+ for(int i=0;i<256;++i) {
+ Utils::snprintf(devpath,sizeof(devpath),"/dev/zt%d",i);
+ if (stat(devpath,&stattmp))
+ throw std::runtime_error("no more TAP devices available");
+ _fd = ::open(devpath,O_RDWR);
+ if (_fd > 0) {
+ char foo[16];
+ Utils::snprintf(foo,sizeof(foo),"zt%d",i);
+ _dev = foo;
+ break;
+ }
+ }
+ }
+
+ if (_fd <= 0)
+ throw std::runtime_error("unable to open TAP device or no more devices available");
+
+ if (fcntl(_fd,F_SETFL,fcntl(_fd,F_GETFL) & ~O_NONBLOCK) == -1) {
+ ::close(_fd);
+ throw std::runtime_error("unable to set flags on file descriptor for TAP device");
+ }
+
+ const char *ifconfig = UNIX_COMMANDS[ZT_UNIX_IFCONFIG_COMMAND];
+ if (!ifconfig) {
+ ::close(_fd);
+ throw std::runtime_error("unable to find 'ifconfig' command on system");
+ }
+
+ // Configure MAC address and MTU, bring interface up
+ 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);
+ long cpid;
+ if ((cpid = (long)vfork()) == 0) {
+ execl(ifconfig,ifconfig,_dev.c_str(),"lladdr",ethaddr,"mtu",mtustr,"up",(const char *)0);
+ _exit(-1);
+ } else {
+ int exitcode = -1;
+ waitpid(cpid,&exitcode,0);
+ if (exitcode) {
+ ::close(_fd);
+ throw std::runtime_error("ifconfig failure setting link-layer address and activating tap interface");
+ }
+ }
+
+ _setIpv6Stuff(_dev.c_str(),true,false);
+
+ // Set close-on-exec so that devices cannot persist if we fork/exec for update
+ fcntl(_fd,F_SETFD,fcntl(_fd,F_GETFD) | FD_CLOEXEC);
+
+ ::pipe(_shutdownSignalPipe);
+
+ _thread = Thread::start(this);
+
+ EthernetTap_instances_m.lock();
+ ++EthernetTap_instances;
+ EthernetTap_instances_m.unlock();
+}
+
+OSXEthernetTap::~OSXEthernetTap()
+{
+ ::write(_shutdownSignalPipe[1],"\0",1); // causes thread to exit
+ Thread::join(_thread);
+ ::close(_fd);
+ ::close(_shutdownSignalPipe[0]);
+ ::close(_shutdownSignalPipe[1]);
+
+ EthernetTap_instances_m.lock();
+ int instances = --EthernetTap_instances;
+ EthernetTap_instances_m.unlock();
+ if (instances <= 0) {
+ // Unload OSX kernel extension on the deletion of the last EthernetTap
+ // instance.
+ const char *kextunload = UNIX_COMMANDS[ZT_MAC_KEXTUNLOAD_COMMAND];
+ if (kextunload) {
+ char tmp[4096];
+ sprintf(tmp,"%s/tap.kext",_r->homePath.c_str());
+ long kextpid = (long)vfork();
+ if (kextpid == 0) {
+ execl(kextunload,kextunload,tmp,(const char *)0);
+ _exit(-1);
+ } else if (kextpid > 0) {
+ int exitcode = -1;
+ waitpid(kextpid,&exitcode,0);
+ }
+ }
+ }
+}
+
+void OSXEthernetTap::setEnabled(bool en)
+{
+ _enabled = en;
+ // TODO: interface status change
+}
+
+bool OSXEthernetTap::enabled() const
+{
+ return _enabled;
+}
+
+static bool ___removeIp(const std::string &_dev,const InetAddress &ip)
+{
+ const char *ifconfig = UNIX_COMMANDS[ZT_UNIX_IFCONFIG_COMMAND];
+ if (!ifconfig)
+ return false;
+ long cpid;
+ if ((cpid = (long)vfork()) == 0) {
+ execl(ifconfig,ifconfig,_dev.c_str(),"inet",ip.toIpString().c_str(),"-alias",(const char *)0);
+ _exit(-1);
+ } else {
+ 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)
+{
+ const char *ifconfig = UNIX_COMMANDS[ZT_UNIX_IFCONFIG_COMMAND];
+ if (!ifconfig) {
+ LOG("ERROR: could not configure IP address for %s: unable to find 'ifconfig' command on system (checked /sbin, /bin, /usr/sbin, /usr/bin)",_dev.c_str());
+ return false;
+ }
+
+ if (!ip)
+ return false;
+
+ std::set<InetAddress> allIps(ips());
+ if (allIps.count(ip) > 0)
+ return true; // IP/netmask already assigned
+
+ // Remove and reconfigure if address is the same but netmask is different
+ for(std::set<InetAddress>::iterator i(allIps.begin());i!=allIps.end();++i) {
+ if ((i->ipsEqual(ip))&&(i->netmaskBits() != ip.netmaskBits())) {
+ if (___removeIp(_dev,*i)) {
+ break;
+ } else {
+ LOG("WARNING: failed to remove old IP/netmask %s to replace with %s",i->toString().c_str(),ip.toString().c_str());
+ }
+ }
+ }
+
+ long cpid;
+ if ((cpid = (long)vfork()) == 0) {
+ execl(ifconfig,ifconfig,_dev.c_str(),ip.isV4() ? "inet" : "inet6",ip.toString().c_str(),"alias",(const char *)0);
+ _exit(-1);
+ } else {
+ int exitcode = -1;
+ waitpid(cpid,&exitcode,0);
+ return (exitcode == 0);
+ }
+
+ return false;
+}
+
+bool OSXEthernetTap::removeIP(const InetAddress &ip)
+{
+ if (ips().count(ip) > 0) {
+ if (___removeIp(_dev,ip))
+ return true;
+ }
+ return false;
+}
+
+std::set<InetAddress> OSXEthernetTap::ips() const
+{
+ struct ifaddrs *ifa = (struct ifaddrs *)0;
+ if (getifaddrs(&ifa))
+ return std::set<InetAddress>();
+
+ std::set<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.insert(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.insert(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);
+
+ return r;
+}
+
+void OSXEthernetTap::put(const MAC &from,const MAC &to,unsigned int etherType,const void *data,unsigned int len)
+{
+ char putBuf[4096 + 14];
+ if ((_fd > 0)&&(len <= _mtu)) {
+ 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 n = ::write(_fd,putBuf,len);
+ if (n <= 0) {
+ LOG("error writing packet to Ethernet tap device: %s",strerror(errno));
+ } else if (n != (int)len) {
+ // Saw this gremlin once, so log it if we see it again... OSX tap
+ // or something seems to have goofy issues with certain MTUs.
+ LOG("ERROR: write underrun: %s tap write() wrote %d of %u bytes of frame",_dev.c_str(),n,len);
+ }
+ }
+}
+
+std::string OSXEthernetTap::deviceName() const
+{
+ return _dev;
+}
+
+std::string OSXEthernetTap::persistentId() const
+{
+ return std::string();
+}
+
+bool OSXEthernetTap::updateMulticastGroups(std::set<MulticastGroup> &groups)
+{
+ std::set<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.insert(MulticastGroup(MAC(la->sdl_data + la->sdl_nlen,6),0));
+ }
+ p = p->ifma_next;
+ }
+ _intl_freeifmaddrs(ifmap);
+ }
+
+ {
+ std::set<InetAddress> allIps(ips());
+ for(std::set<InetAddress>::const_iterator i(allIps.begin());i!=allIps.end();++i)
+ newGroups.insert(MulticastGroup::deriveMulticastGroupForAddressResolution(*i));
+ }
+
+ bool changed = false;
+
+ for(std::set<MulticastGroup>::iterator mg(newGroups.begin());mg!=newGroups.end();++mg) {
+ if (!groups.count(*mg)) {
+ groups.insert(*mg);
+ changed = true;
+ }
+ }
+ for(std::set<MulticastGroup>::iterator mg(groups.begin());mg!=groups.end();) {
+ if ((!newGroups.count(*mg))&&(*mg != _blindWildcardMulticastGroup)) {
+ groups.erase(mg++);
+ changed = true;
+ } else ++mg;
+ }
+
+ return changed;
+}
+
+void OSXEthernetTap::threadMain()
+ throw()
+{
+ fd_set readfds,nullfds;
+ MAC to,from;
+ int n,nfds,r;
+ char getBuf[8194];
+ Buffer<4096> data;
+
+ // Wait for a moment after startup -- wait for Network to finish
+ // constructing itself.
+ Thread::sleep(500);
+
+ FD_ZERO(&readfds);
+ FD_ZERO(&nullfds);
+ nfds = (int)std::max(_shutdownSignalPipe[0],_fd) + 1;
+
+ r = 0;
+ for(;;) {
+ FD_SET(_shutdownSignalPipe[0],&readfds);
+ FD_SET(_fd,&readfds);
+ select(nfds,&readfds,&nullfds,&nullfds,(struct timeval *)0);
+
+ if (FD_ISSET(_shutdownSignalPipe[0],&readfds)) // writes to shutdown pipe terminate thread
+ break;
+
+ if (FD_ISSET(_fd,&readfds)) {
+ n = (int)::read(_fd,getBuf + r,sizeof(getBuf) - r);
+ if (n < 0) {
+ if ((errno != EINTR)&&(errno != ETIMEDOUT)) {
+ TRACE("unexpected error reading from tap: %s",strerror(errno));
+ break;
+ }
+ } else {
+ // Some tap drivers like to send the ethernet frame and the
+ // payload in two chunks, so handle that by accumulating
+ // data until we have at least a frame.
+ r += n;
+ if (r > 14) {
+ if (r > ((int)_mtu + 14)) // sanity check for weird TAP behavior on some platforms
+ r = _mtu + 14;
+ to.setTo(getBuf,6);
+ from.setTo(getBuf + 6,6);
+ unsigned int etherType = ntohs(((const uint16_t *)getBuf)[6]);
+ if (etherType != 0x8100) { // VLAN tagged frames are not supported!
+ data.copyFrom(getBuf + 14,(unsigned int)r - 14);
+ _handler(_arg,from,to,etherType,data);
+ }
+ r = 0;
+ }
+ }
+ }
+ }
+}
+
+} // namespace ZeroTier
generated by cgit v1.2.3 (git 2.39.1) at 2025-04-25 18:21:35 +0000