12 Commits (96cad35870c07480c33596dc4954ccb3a438eae6)

Author	SHA1	Message	Date
Andrew Dunham	e966f024b0	net/dns: print systemd-resolved ResolvConfMode ... The ResolvConfMode property is documented to return how systemd-resolved is currently managing /etc/resolv.conf. Include that information in the debug line, when available, to assist in debugging DNS issues. Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I1ae3a257df1d318d0193a8c7f135c458ec45093e	2 years ago
nyghtowl	e6e1976c3a	net/dns: remove systemd-resolved ping ... Ping only needed to ensure system awak otherwise utilizing resolvConf to set dns mode. Signed-off-by: nyghtowl <warrick@tailscale.com>	2 years ago
Josh Bleecher Snyder	0868329936	all: use any instead of interface{} ... My favorite part of generics. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Brad Fitzpatrick	15599323a1	net/dns: fix systemd-resolved detection race at boot ... If systemd-resolved is enabled but not running (or not yet running, such as early boot) and resolv.conf is old/dangling, we weren't detecting systemd-resolved. This moves its ping earlier, which will trigger it to start up and write its file. Updates #3362 (likely fixes) Updates #3531 (likely fixes) Change-Id: I6392944ac59f600571c43b8f7a677df224f2beed Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Denton Gentry	dbea8217ac	net/dns: add NetworkManager regression test ... Use the exact /etc/resolv.conf file from a user report. Updates https://github.com/tailscale/tailscale/issues/3531 Signed-off-by: Denton Gentry <dgentry@tailscale.com>	3 years ago
Brad Fitzpatrick	6feb8f4c51	net/dns: log why resolved does not look like it's on use [Linux] ... Updates #3742 Updates #3531 Change-Id: I9fc7fa0f4bcab1cf8001ba92408c660a5b25f105 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
David Anderson	c5d572f371	net/dns: correctly handle NetworkManager-managed DNS that points to resolved. ... Fixes #3304 Signed-off-by: David Anderson <danderson@tailscale.com>	3 years ago
Denton Gentry	139a6c4c9c	net/dns: detect when resolvconf points to systemd-resolved. ... There are /etc/resolv.conf files out there where resolvconf wrote the file but pointed to systemd-resolved as the nameserver. We're better off handling those as systemd-resolved. > # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) > # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN > # 127.0.0.53 is the systemd-resolved stub resolver. > # run "systemd-resolve --status" to see details about the actual nameservers. Fixes https://github.com/tailscale/tailscale/issues/3026 Signed-off-by: Denton Gentry <dgentry@tailscale.com>	3 years ago
David Anderson	a320d70614	net/dns: fall back to copy+delete/truncate if moving to/from /etc/resolv.conf fails. ... In some containers, /etc/resolv.conf is a bind-mount from outside the container. This prevents renaming to or from /etc/resolv.conf, because it's on a different filesystem from linux's perspective. It also prevents removing /etc/resolv.conf, because doing so would break the bind-mount. If we find ourselves within this environment, fall back to using copy+delete when renaming to /etc/resolv.conf, and copy+truncate when renaming from /etc/resolv.conf. Fixes #3000 Co-authored-by: Denton Gentry <dgentry@tailscale.com> Signed-off-by: David Anderson <danderson@tailscale.com>	3 years ago
Brad Fitzpatrick	640134421e	all: update tests to use tstest.MemLogger ... And give MemLogger a mutex, as one caller had, which does match the logf contract better. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
David Anderson	10547d989d	net/dns: exhaustively test DNS selection paths for linux. ... Signed-off-by: David Anderson <danderson@tailscale.com>	3 years ago
Brad Fitzpatrick	065c4ffc2c	net/dns: add start of Linux newOSConfigurator tests ... Only one test case so far. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago