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More reliable full tunnel on macOs

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This makes switching between physical networks
with full tunnel mode enabled more reliable.
There were issues with the physical default route or device
changing.
This commit is contained in:
travisladuke 2023-08-28 13:04:17 -07:00 committed by Travis LaDuke
parent e299eea2b1
commit 557b92a167
1 changed files with 39 additions and 40 deletions
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79
osdep/ManagedRoute.cpp
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@ -484,58 +484,57 @@ bool ManagedRoute::sync()
if (!hasRoute) {
if (_target && _target.netmaskBits() == 0) {
if (_target && _target.netmaskBits() == 0) { // Allow Default
InetAddress newSystemVia;
char newSystemDevice[128];
newSystemDevice[0] = (char)0;
// If macos has a network hiccup, it deletes what _systemVia we had set.
// Then we don't know how to set the default route again.
// So use the one we had set previously. Don't overwrite it.
if (!_systemVia) {
// Find system default route that this route should override
// We need to put it back when default route is turned off
for(std::vector<_RTE>::iterator r(rtes.begin());r!=rtes.end();++r) {
if (r->via) {
if ( !_systemVia && r->isDefault == 1 && (strcmp(r->device,_device) != 0) ) {
newSystemVia = r->via;
Utils::scopy(newSystemDevice,sizeof(newSystemDevice),r->device);
}
}
}
if (newSystemVia) { _systemVia = newSystemVia; }
// if our routes got deleted
// delete the systemd via that we had added with -ifscope
if (_systemVia && !!_systemDevice[0]) {
_routeCmd("delete",_target,_systemVia,_systemDevice,(const char *)0);
}
_systemVia = newSystemVia;
Utils::scopy(_systemDevice,sizeof(_systemDevice),newSystemDevice);
// If macos has a network hiccup, it deletes what the route we set, and it's own physical routes.
// if !hasRoute (our 0.0.0.0 has been deleted), the OS has changed stuff
// So don't assume _systemX are valid anymore. Always get for _system{Via,Device}
// char buf1[255], buf2[255];
// fprintf(stderr, "_systemVia %s new %s\n", _systemVia.toString(buf1), newSystemVia.toString(buf2));
if (!_systemVia) { return false; }
// Find system default route that this route should override
// We need to put it back when default route is turned off
for(std::vector<_RTE>::iterator r(rtes.begin());r!=rtes.end();++r) {
if (r->via) {
if ( r->isDefault == 1 && (strcmp(r->device,_device) != 0) ) {
if (!_systemDevice[0]) {
// Get device corresponding to route if we don't have that already
if ((newSystemVia)&&(!newSystemDevice[0])) {
rtes = _getRTEs(newSystemVia,true);
for(std::vector<_RTE>::iterator r(rtes.begin());r!=rtes.end();++r) {
if ( (r->device[0]) && (strcmp(r->device,_device) != 0) && r->target.netmaskBits() != 0) {
Utils::scopy(newSystemDevice,sizeof(newSystemDevice),r->device);
break;
}
// char buf[255];
// fprintf(stderr, "system device1 %s %s\n", r->via.toString(buf), r->device);
newSystemVia = r->via;
Utils::scopy(newSystemDevice,sizeof(newSystemDevice),r->device);
break;
}
}
if (newSystemDevice[0]) {
Utils::scopy(_systemDevice,sizeof(_systemDevice),newSystemDevice);
}
}
// fprintf(stderr, "_systemDevice %s new %s\n", _systemDevice, newSystemDevice);
if (!_systemDevice[0]) { return false; }
if (newSystemVia) { _systemVia = newSystemVia; }
if (newSystemDevice[0]) {
Utils::scopy(_systemDevice,sizeof(_systemDevice),newSystemDevice);
}
// if there's no newSystemVia, the OS might not have
// ipv4 or ipv6 connectivity.
// we should still add our ZeroTier ipv4 or 6 routes though
if (!!_systemVia && !!_systemDevice[0]) {
_routeCmd("delete",_target,_systemVia,(const char *)0,(const char *)0);
}
// Do Default Route route commands
_routeCmd("delete",_target,_systemVia,(const char *)0,(const char *)0);
_routeCmd("add",_target,_via,(const char *)0,(const char *)0);
_routeCmd("add",_target,_systemVia,_systemDevice,(const char *)0);
if (!!_systemVia && !!_systemDevice[0]) {
_routeCmd("add",_target,_systemVia,_systemDevice,(const char *)0);
}
_applied[_target] = true;
@ -595,8 +594,8 @@ void ManagedRoute::remove()
for(std::map<InetAddress,bool>::iterator r(_applied.begin());r!=_applied.end();++r) {
#ifdef __BSD__ // ------------------------------------------------------------
if (_target && _target.netmaskBits() == 0) {
if (_systemVia) {
_routeCmd("delete",_target,_via,(const char *)0,(const char *)0);
_routeCmd("delete",_target,_via,(const char *)0,(const char *)0);
if (_systemVia && _systemDevice[0]) {
_routeCmd("delete",_target,_systemVia,_systemDevice,(const char *)0);
_routeCmd("add",_target,_systemVia,(const char *)0,(const char *)0);