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fix macos default route again

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see commit fb6af1971 * Fix network DNS on macOS
adding that stuff to System Config causes this extra route to be added
which breaks ipv4 default route.
We figured out a weird System Coniguration setting
that works.

--- old
couldn't figure out how to fix it in SystemConfiguration
so here we are# Please enter the commit message for your changes. Lines starting

We also moved the dns setter to before the syncIps stuff
to help with a race condition. It didn't always work when
you re-joined a network with default route enabled.
This commit is contained in:
travisladuke 2023-08-11 11:06:25 -07:00 committed by Travis LaDuke
parent d976a9f5a0
commit 1d095e81d9
2 changed files with 45 additions and 31 deletions
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5
osdep/MacDNSHelper.mm
View File

@ -107,7 +107,6 @@ void MacDNSHelper::removeDNS(uint64_t nwid)
bool MacDNSHelper::addIps4(uint64_t nwid, const MAC mac, const char *dev, const std::vector<InetAddress>& addrs)
{
const char* ipStr = {0};
const char* ipStr2 = {0};
char buf2[256] = {0};
bool hasV4 = false;
@ -116,7 +115,6 @@ bool MacDNSHelper::addIps4(uint64_t nwid, const MAC mac, const char *dev, const
hasV4 = true;
ipStr = addrs[i].toIpString(buf2);
ipStr2 = addrs[i].toIpString(buf2);
break;
}
@ -141,7 +139,8 @@ bool MacDNSHelper::addIps4(uint64_t nwid, const MAC mac, const char *dev, const
CFStringRef cfdev = CFStringCreateWithCString(NULL, dev, kCFStringEncodingUTF8);
CFStringRef cfserver = CFStringCreateWithCString(NULL, "127.0.0.1", kCFStringEncodingUTF8);
CFStringRef cfrouter = CFStringCreateWithCString(NULL, ipStr2, kCFStringEncodingUTF8);
// using the ip from the zerotier network breaks routing on the mac
CFStringRef cfrouter = CFStringCreateWithCString(NULL, "127.0.0.1", kCFStringEncodingUTF8);
const int SIZE = 4;
CFStringRef keys[SIZE];

35
osdep/ManagedRoute.cpp
View File

@ -252,7 +252,7 @@ static std::vector<_RTE> _getRTEs(const InetAddress &target,bool contains)
static void _routeCmd(const char *op,const InetAddress &target,const InetAddress &via,const char *ifscope,const char *localInterface)
{
//char f1[1024],f2[1024]; printf("%s %s %s %s %s\n",op,target.toString(f1),via.toString(f2),ifscope,localInterface);
// char f1[1024],f2[1024]; printf("cmd %s %s %s %s %s\n",op,target.toString(f1),via.toString(f2),ifscope,localInterface);
long p = (long)fork();
if (p > 0) {
int exitcode = -1;
@ -479,6 +479,9 @@ bool ManagedRoute::sync()
if (hasRoute) { break; }
}
// char buf[255];
// fprintf(stderr, "hasRoute %d %s\n", !!hasRoute, _target.toString(buf));
if (!hasRoute) {
if (_target && _target.netmaskBits() == 0) {
@ -486,6 +489,10 @@ bool ManagedRoute::sync()
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) {
@ -497,9 +504,15 @@ bool ManagedRoute::sync()
}
}
}
if (newSystemVia) { _systemVia = newSystemVia; }
}
if (!newSystemVia) { return false; }
// char buf1[255], buf2[255];
// fprintf(stderr, "_systemVia %s new %s\n", _systemVia.toString(buf1), newSystemVia.toString(buf2));
if (!_systemVia) { return false; }
if (!_systemDevice[0]) {
// Get device corresponding to route if we don't have that already
if ((newSystemVia)&&(!newSystemDevice[0])) {
rtes = _getRTEs(newSystemVia,true);
@ -510,22 +523,24 @@ bool ManagedRoute::sync()
}
}
}
if (!newSystemDevice[0]) { return false; }
// update the system via in case it changed out from under us
// while we were in default route mode
_systemVia = newSystemVia;
if (newSystemDevice[0]) {
Utils::scopy(_systemDevice,sizeof(_systemDevice),newSystemDevice);
}
}
// fprintf(stderr, "_systemDevice %s new %s\n", _systemDevice, newSystemDevice);
if (!_systemDevice[0]) { return false; }
// Do the actual default route commands
// 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);
_applied[_target] = true;
} else {
// Do the actual route commands
// Do Non-Default route commands
_applied[_target] = true;
_routeCmd("add",leftt,_via,(const char *)0,(_via) ? (const char *)0 : _device);
}