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use /dev/tap{0..3}; it is fully working now

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This commit is contained in:
Daniel Skowroński 2016-12-26 02:52:07 +01:00
parent f09eedbd7a
commit 218ace51a7
1 changed files with 31 additions and 10 deletions
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41
osdep/NetBSDEthernetTap.cpp
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@ -61,6 +61,8 @@
#include "OSUtils.hpp"
#include "NetBSDEthernetTap.hpp"
#include <iostream>
using namespace std;
#define ZT_BASE32_CHARS "0123456789abcdefghijklmnopqrstuv"
// ff:ff:ff:ff:ff:ff with no ADI
@ -111,13 +113,12 @@ NetBSDEthernetTap::NetBSDEthernetTap(
if (mtu > 2800)
throw std::runtime_error("max tap MTU is 2800");
// 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>
// On NetBSD there are /dev/tap{0..3} pre-created and for a moment I will stick with only them
std::vector<std::string> devFiles(OSUtils::listDirectory("/dev"));
for(int i=9993;i<(9993+128);++i) {
for(int i=0;i<4;++i) {
Utils::snprintf(tmpdevname,sizeof(tmpdevname),"tap%d",i);
Utils::snprintf(devpath,sizeof(devpath),"/dev/%s",tmpdevname);
if (std::find(devFiles.begin(),devFiles.end(),std::string(tmpdevname)) == devFiles.end()) {
//if (std::find(devFiles.begin(),devFiles.end(),std::string(tmpdevname)) == devFiles.end()) {
long cpid = (long)vfork();
if (cpid == 0) {
::execl("/sbin/ifconfig","/sbin/ifconfig",tmpdevname,"create",(const char *)0);
@ -127,8 +128,10 @@ NetBSDEthernetTap::NetBSDEthernetTap(
::waitpid(cpid,&exitcode,0);
} else throw std::runtime_error("fork() failed");
_dev = tmpdevname;
_fd = ::open( devpath,O_RDWR);
if (!stat(devpath,&stattmp)) {
cpid = (long)vfork();
/*cpid = (long)vfork();
if (cpid == 0) {
::execl("/sbin/ifconfig","/sbin/ifconfig",tmpdevname,"name",_dev.c_str(),(const char *)0);
::_exit(-1);
@ -137,16 +140,16 @@ NetBSDEthernetTap::NetBSDEthernetTap(
::waitpid(cpid,&exitcode,0);
if (exitcode)
throw std::runtime_error("ifconfig rename operation failed");
} else throw std::runtime_error("fork() failed");
} else throw std::runtime_error("fork() failed");*/
_fd = ::open(devpath,O_RDWR);
if (_fd > 0)
break;
else throw std::runtime_error("unable to open created tap device");
//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");
}
}
//}
}
if (_fd <= 0)
@ -163,7 +166,7 @@ NetBSDEthernetTap::NetBSDEthernetTap(
Utils::snprintf(metstr,sizeof(metstr),"%u",_metric);
long cpid = (long)vfork();
if (cpid == 0) {
::execl("/sbin/ifconfig","/sbin/ifconfig",_dev.c_str(),"lladdr",ethaddr,"mtu",mtustr,"metric",metstr,"up",(const char *)0);
::execl("/sbin/ifconfig","/sbin/ifconfig",_dev.c_str(),"link",ethaddr,"mtu",mtustr,"metric",metstr,"up",(const char *)0);
::_exit(-1);
} else if (cpid > 0) {
int exitcode = -1;
@ -174,12 +177,30 @@ NetBSDEthernetTap::NetBSDEthernetTap(
}
}
// ifconfig link seems to be different from address
// https://wiki.netbsd.org/tutorials/faking_a_mac_address/
cpid = (long)vfork();
if (cpid == 0) {
string cmdline = "net.link.tap."+string(_dev);
cmdline += "="+string(ethaddr);
::execl("/sbin/sysctl","/sbin/sysctl","-w",cmdline.c_str(),(const char *)0);
::_exit(-1);
} else if (cpid > 0) {
int exitcode = -1;
::waitpid(cpid,&exitcode,0);
if (exitcode) {
::close(_fd);
throw std::runtime_error("sysctl failure setting link-layer address and activating tap interface");
}
}
// 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);
}
NetBSDEthernetTap::~NetBSDEthernetTap()