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Mihai Parparita fa932fefe7 net/interfaces: redo how we get the default interface on macOS and iOS ... With #6566 we added an external mechanism for getting the default interface, and used it on macOS and iOS (see tailscale/corp#8201). The goal was to be able to get the default physical interface even when using an exit node (in which case the routing table would say that the Tailscale utun* interface is the default). However, the external mechanism turns out to be unreliable in some cases, e.g. when multiple cellular interfaces are present/toggled (I have occasionally gotten my phone into a state where it reports the pdp_ip1 interface as the default, even though it can't actually route traffic). It was observed that `ifconfig -v` on macOS reports an "effective interface" for the Tailscale utn* interface, which seems promising. By examining the ifconfig source code, it turns out that this is done via a SIOCGIFDELEGATE ioctl syscall. Though this is a private API, it appears to have been around for a long time (e.g. it's in the 10.13 xnu release at https://opensource.apple.com/source/xnu/xnu-4570.41.2/bsd/net/if_types.h.auto.html) and thus is unlikely to go away. We can thus use this ioctl if the routing table says that a utun* interface is the default, and go back to the simpler mechanism that we had before #6566. Updates #7184 Updates #7188 Signed-off-by: Mihai Parparita <mihai@tailscale.com>		1 year ago
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testdata	ipn/ipnlocal: fix the path for writing cert files (#7203)	1 year ago
c2n.go	all: update copyright and license headers	1 year ago
cert.go	ipn/ipnlocal: fix the path for writing cert files (#7203)	1 year ago
cert_js.go	all: update copyright and license headers	1 year ago
cert_test.go	ipn/ipnlocal: fix the path for writing cert files (#7203)	1 year ago
dnsconfig_test.go	all: update copyright and license headers	1 year ago
expiry.go	ipn/ipnlocal: handle more edge cases in netmap expiry timer	1 year ago
expiry_test.go	ipn/ipnlocal: handle more edge cases in netmap expiry timer	1 year ago
local.go	net/interfaces: redo how we get the default interface on macOS and iOS	1 year ago
local_test.go	ipn/ipnlocal: drop not required StateKey parameter	1 year ago
loglines_test.go	ipn/ipnlocal: drop not required StateKey parameter	1 year ago
network-lock.go	all: update copyright and license headers	1 year ago
network-lock_test.go	ipn/ipnlocal: drop not required StateKey parameter	1 year ago
peerapi.go	ipn/ipnlocal: fix passthrough of formatting arguments in PeerAPI doctor output	1 year ago
peerapi_h2c.go	all: update copyright and license headers	1 year ago
peerapi_macios_ext.go	all: update copyright and license headers	1 year ago
peerapi_test.go	ipn/ipnlocal: drop not required StateKey parameter	1 year ago
profiles.go	ipn/ipnlocal: use presence of NodeID to identify logins	1 year ago
profiles_test.go	ipn/ipnlocal: use presence of NodeID to identify logins	1 year ago
serve.go	all: update to Go 1.20, use strings.CutPrefix/Suffix instead of our fork	1 year ago
serve_test.go	all: update copyright and license headers	1 year ago
ssh.go	all: update copyright and license headers	1 year ago
ssh_stub.go	all: update copyright and license headers	1 year ago
ssh_test.go	ipn/ipnlocal: drop not required StateKey parameter	1 year ago
state_test.go	ipn/ipnlocal: use presence of NodeID to identify logins	1 year ago