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mimic BSDEthernetTap but with creating/destroying char tap device

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This commit is contained in:
Daniel Skowroński 2016-12-27 11:42:43 +01:00
parent 218ace51a7
commit 9a2310395d
1 changed files with 27 additions and 1 deletions
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28
osdep/NetBSDEthernetTap.cpp
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@ -115,7 +115,8 @@ NetBSDEthernetTap::NetBSDEthernetTap(
// On NetBSD there are /dev/tap{0..3} pre-created and for a moment I will stick with only them // 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")); std::vector<std::string> devFiles(OSUtils::listDirectory("/dev"));
for(int i=0;i<4;++i) { // for(int i=0;i<4;++i) {
for(int i=9993;i<(9993+128);++i) {
Utils::snprintf(tmpdevname,sizeof(tmpdevname),"tap%d",i); Utils::snprintf(tmpdevname,sizeof(tmpdevname),"tap%d",i);
Utils::snprintf(devpath,sizeof(devpath),"/dev/%s",tmpdevname); 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()) {
@ -128,6 +129,20 @@ NetBSDEthernetTap::NetBSDEthernetTap(
::waitpid(cpid,&exitcode,0); ::waitpid(cpid,&exitcode,0);
} else throw std::runtime_error("fork() failed"); } else throw std::runtime_error("fork() failed");
cpid = (long)vfork();
if (cpid == 0) {
string tmp;
sprintf((char*)tmp.c_str(), "%d", i);
string minor = tmp.c_str();
::execl("/sbin/mknod","/sbin/mknod",devpath,"c","169",minor.c_str(),(const char *)0); //major 169 => tap
::_exit(-1);
} else if (cpid > 0) {
int exitcode = -1;
::waitpid(cpid,&exitcode,0);
} else throw std::runtime_error("fork() failed");
cerr<<"created device "<<devpath<<endl;
_dev = tmpdevname; _dev = tmpdevname;
_fd = ::open( devpath,O_RDWR); _fd = ::open( devpath,O_RDWR);
if (!stat(devpath,&stattmp)) { if (!stat(devpath,&stattmp)) {
@ -219,6 +234,17 @@ NetBSDEthernetTap::~NetBSDEthernetTap()
int exitcode = -1; int exitcode = -1;
::waitpid(cpid,&exitcode,0); ::waitpid(cpid,&exitcode,0);
} }
cpid = (long)vfork();
if (cpid == 0) {
string tmp="/dev/";
tmp+=_dev.c_str();
::execl("/bin/rm","/bin/rm",tmp.c_str(),(const char *)0);
::_exit(-1);
} else if (cpid > 0) {
int exitcode = -1;
::waitpid(cpid,&exitcode,0);
} else throw std::runtime_error("fork() failed");
} }
void NetBSDEthernetTap::setEnabled(bool en) void NetBSDEthernetTap::setEnabled(bool en)