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Fix network DNS on macOS

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It stopped working for ipv4 only networks in Monterey.
See #1696

We add some config like so to System Configuration

```
scutil
show State:/Network/Service/9bee8941b5xxxxxx/IPv4
<dictionary> {
  Addresses : <array> {
    0 : 10.2.1.36
  }
  InterfaceName : feth4823
  Router : 10.2.1.36
  ServerAddress : 127.0.0.1
}

```
This commit is contained in:
travisladuke 2023-07-25 16:03:29 -07:00 committed by Travis LaDuke
parent 41f9bdc5db
commit fb6af1971b
4 changed files with 137 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
osdep/MacDNSHelper.hpp
View File

@ -12,8 +12,10 @@ class MacDNSHelper
public:
static void setDNS(uint64_t nwid, const char *domain, const std::vector<InetAddress> &servers);
static void removeDNS(uint64_t nwid);
static bool addIps(uint64_t nwid, const MAC mac, const char *dev, const std::vector<InetAddress> &addrs);
static bool removeIps(uint64_t nwid);
static bool addIps4(uint64_t nwid, const MAC mac, const char *dev, const std::vector<InetAddress> &addrs);
static bool addIps6(uint64_t nwid, const MAC mac, const char *dev, const std::vector<InetAddress> &addrs);
static bool removeIps4(uint64_t nwid);
static bool removeIps6(uint64_t nwid);
};
}

129
osdep/MacDNSHelper.mm
View File

@ -95,9 +95,114 @@ void MacDNSHelper::removeDNS(uint64_t nwid)
// Originally I planned to put all the v6 ip addresses from the network into the config.
// But only the link local address is necessary and sufficient. Added other v6 addresses
// doesn't do anything.
bool MacDNSHelper::addIps(uint64_t nwid, const MAC mac, const char *dev, const std::vector<InetAddress>& addrs)
{
//
// As of Monterey we need IPv4 set up too.
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;
for (unsigned int i = 0; i < addrs.size(); ++i) {
if (addrs[i].isV4()) {
hasV4 = true;
ipStr = addrs[i].toIpString(buf2);
ipStr2 = addrs[i].toIpString(buf2);
break;
}
}
if (!hasV4) {
MacDNSHelper::removeIps4(nwid);
return true;
}
SCDynamicStoreRef ds = SCDynamicStoreCreate(NULL, CFSTR("zerotier"), NULL, NULL);
char buf[256] = { 0 };
sprintf(buf, "State:/Network/Service/%.16llx/IPv4", nwid);
CFStringRef key = CFStringCreateWithCString(NULL, buf, kCFStringEncodingUTF8);
CFStringRef cfaddr = CFStringCreateWithCString(NULL, ipStr, kCFStringEncodingUTF8);
CFArrayRef addrArray = CFArrayCreate(NULL, (const void**)&cfaddr, 1, &kCFTypeArrayCallBacks);
CFStringRef cfdev = CFStringCreateWithCString(NULL, dev, kCFStringEncodingUTF8);
CFStringRef cfserver = CFStringCreateWithCString(NULL, "127.0.0.1", kCFStringEncodingUTF8);
CFStringRef cfrouter = CFStringCreateWithCString(NULL, ipStr2, kCFStringEncodingUTF8);
const int SIZE = 4;
CFStringRef keys[SIZE];
keys[0] = CFSTR("Addresses");
keys[1] = CFSTR("InterfaceName");
keys[2] = CFSTR("ServerAddress");
keys[3] = CFSTR("Router");
CFTypeRef values[SIZE];
values[0] = addrArray;
values[1] = cfdev;
values[2] = cfserver;
values[3] = cfrouter;
CFDictionaryRef dict = CFDictionaryCreate(NULL,
(const void**)keys, (const void**)values, SIZE, &kCFCopyStringDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
// CFDictionaryApplyFunction(dict, printKeys, NULL);
CFArrayRef list = SCDynamicStoreCopyKeyList(ds, key);
CFIndex i = 0, j = CFArrayGetCount(list);
bool addrsChanged = true;
CFPropertyListRef oldAddrs = NULL;
bool ret = TRUE;
if (j > 0) {
oldAddrs = SCDynamicStoreCopyValue(ds, (CFStringRef)CFArrayGetValueAtIndex(list, i));
addrsChanged = !CFEqual(oldAddrs,dict);
}
if (addrsChanged) {
if (j <= 0) {
ret &= SCDynamicStoreAddValue(ds, key, dict);
} else {
ret &= SCDynamicStoreSetValue(ds, (CFStringRef)CFArrayGetValueAtIndex(list, i), dict);
}
if (!ret) {
fprintf(stderr, "Error writing IPv6 configuration\n");
}
}
if (oldAddrs != NULL) {
CFRelease(oldAddrs);
}
CFRelease(cfaddr);
CFRelease(addrArray);
CFRelease(cfdev);
CFRelease(cfserver);
CFRelease(cfrouter);
CFRelease(ds);
CFRelease(key);
// for (unsigned int i = 0; i < SIZE; ++i) {
// values[i] = NULL;
// }
CFRelease(list);
CFRelease(dict);
return ret;
}
bool MacDNSHelper::addIps6(uint64_t nwid, const MAC mac, const char *dev, const std::vector<InetAddress>& addrs)
{
bool hasV6 = false;
for (unsigned int i = 0; i < addrs.size(); ++i) {
if (addrs[i].isV6()) {
@ -107,7 +212,7 @@ bool MacDNSHelper::addIps(uint64_t nwid, const MAC mac, const char *dev, const s
}
if (!hasV6) {
MacDNSHelper::removeIps(nwid);
MacDNSHelper::removeIps6(nwid);
return true;
}
@ -204,7 +309,7 @@ bool MacDNSHelper::addIps(uint64_t nwid, const MAC mac, const char *dev, const s
return ret;
}
bool MacDNSHelper::removeIps(uint64_t nwid)
bool MacDNSHelper::removeIps6(uint64_t nwid)
{
SCDynamicStoreRef ds = SCDynamicStoreCreate(NULL, CFSTR("zerotier"), NULL, NULL);
@ -218,4 +323,20 @@ bool MacDNSHelper::removeIps(uint64_t nwid)
return res;
}
bool MacDNSHelper::removeIps4(uint64_t nwid)
{
SCDynamicStoreRef ds = SCDynamicStoreCreate(NULL, CFSTR("zerotier"), NULL, NULL);
char buf[256] = {0};
sprintf(buf, "State:/Network/Service/%.16llx/IPv4", nwid);
CFStringRef key = CFStringCreateWithCString(NULL, buf, kCFStringEncodingUTF8);
bool res = SCDynamicStoreRemoveValue(ds, key);
CFRelease(key);
CFRelease(ds);
return res;
}
}

3
osdep/MacEthernetTap.cpp
View File

@ -245,7 +245,8 @@ MacEthernetTap::~MacEthernetTap()
pid_t pid0,pid1;
MacDNSHelper::removeDNS(_nwid);
MacDNSHelper::removeIps(_nwid);
MacDNSHelper::removeIps4(_nwid);
MacDNSHelper::removeIps6(_nwid);
Mutex::Lock _gl(globalTapCreateLock);
::write(_shutdownSignalPipe[1],"\0",1); // causes thread to exit

7
service/OneService.cpp
View File

@ -2531,8 +2531,13 @@ public:
}
#ifdef __APPLE__
if (!MacDNSHelper::addIps(n.config().nwid, n.config().mac, n.tap()->deviceName().c_str(), newManagedIps))
if (!MacDNSHelper::addIps6(n.config().nwid, n.config().mac, n.tap()->deviceName().c_str(), newManagedIps)) {
fprintf(stderr, "ERROR: unable to add v6 addresses to system configuration" ZT_EOL_S);
}
if (!MacDNSHelper::addIps4(n.config().nwid, n.config().mac, n.tap()->deviceName().c_str(), newManagedIps)) {
fprintf(stderr, "ERROR: unable to add v4 addresses to system configuration" ZT_EOL_S);
}
#endif
n.setManagedIps(newManagedIps);
}