Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:  rl1987
 Type:  defect   | Status:  closed
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.6.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:  fixed
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos, 032-unreached|
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
-+-

Comment (by teor):

 I ran this code on chutney on macOS with and without resolv.conf. It works
 both ways.

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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:  rl1987
 Type:  defect   | Status:  closed
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.6.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:  fixed
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos, 032-unreached|
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
-+-

Comment (by teor):

 Commit b7edfcbf6b in this branch introduces a memory leak: tor_addr needs
 to be freed if it is not returned by the function. See #28257.

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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:  rl1987
 Type:  defect   | Status:  closed
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.6.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:  fixed
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos, 032-unreached|
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
-+-
Changes (by nickm):

 * status:  needs_review => closed
 * resolution:   => fixed


Comment:

 LGTM; merging!

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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:  rl1987
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.6.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos, 032-unreached|
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
-+-
Changes (by rl1987):

 * status:  needs_revision => needs_review


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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:  rl1987
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.6.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos, 032-unreached|
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
-+-
Changes (by nickm):

 * status:  needs_review => needs_revision


Comment:

 Hi!  I found one place where you need to check a return value.  Otherwise
 this looks fine.  Thanks!

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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:  rl1987
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.6.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos, 032-unreached|
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
-+-
Changes (by rl1987):

 * status:  needs_revision => needs_review


Comment:

 https://github.com/torproject/tor/pull/425

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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:  rl1987
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.6.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos, 032-unreached|
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
-+-
Changes (by nickm):

 * status:  needs_review => needs_revision


Comment:

 Hi, looks nice!  I've added a few comments to the codebase.

 Also, have you tested this?  It would be good to have tests to make sure
 this does what we expect.

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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:  rl1987
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.6.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos, 032-unreached|
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
-+-
Changes (by dgoulet):

 * reviewer:  ahf => nickm


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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:  rl1987
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.6.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos, 032-unreached|
Parent ID:   | Points:  2
 Reviewer:   |Sponsor:
-+-
Changes (by teor):

 * milestone:  Tor: unspecified => Tor: 0.3.6.x-final


Comment:

 Assigning to 0.3.6, because this area of code is less tested, and has
 resulted in instability in the past.

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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:  rl1987
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  unspecified
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos, 032-unreached|
Parent ID:   | Points:  2
 Reviewer:   |Sponsor:
-+-
Changes (by rl1987):

 * status:  accepted => needs_review


Comment:

 https://github.com/torproject/tor/pull/273

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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:  rl1987
 Type:  defect   | Status:
 |  accepted
 Priority:  Medium   |  Milestone:  Tor:
 |  unspecified
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos, 032-unreached|
Parent ID:   | Points:  2
 Reviewer:   |Sponsor:
-+-

Comment (by rl1987):

 To reproduce, run:

 {{{
 src/app/tor -ORPort 4430 -ServerDNSResolvConfFile no_such_file -SOCKSPort
 9053 -Log debug
 }}}
 and

 {{{
 src/app/tor -ORPort 4430 -ServerDNSResolvConfFile /dev/null -SOCKSPort
 9053 -Log debug
 }}}

 The latter yields (on my macOS system):

 {{{
 Aug 13 17:07:34.000 [debug] configure_nameservers: stat()ing /dev/null
 Aug 13 17:07:34.000 [info] configure_nameservers: Parsing resolver
 configuration in '/dev/null'
 Aug 13 17:07:34.000 [info] eventdns: Parsing resolv.conf file /dev/null
 Aug 13 17:07:34.000 [info] eventdns: Added nameserver 127.0.0.1:53 as
 0x7fa1201bc490
 Aug 13 17:07:34.000 [warn] Unable to parse '/dev/null', or no nameservers
 in '/dev/null' (6)
 Aug 13 17:07:34.000 [info] mark_my_descriptor_dirty: Decided to publish
 new relay descriptor: dns resolvers failed
 Aug 13 17:07:34.000 [warn] Couldn't set up any working nameservers.
 Network not up yet?  Will try again soon.
 }}}

 Note that empty resolv.conf is still treated as error condition - by
 libevent code, not by tor. Libevent also falls back to including 127.0.0.1
 as default DNS server. See
 https://github.com/libevent/libevent/blob/master/evdns.c#L3649

 So I suppose we should:

  * When resolv.conf is empty or non-existant:
* Don't `goto err`
* Add 127.0.0.1 to list of DNS servers.
* Print a scary warning.
* Mention the above behavior in manpage.

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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:  rl1987
 Type:  defect   | Status:
 |  accepted
 Priority:  Medium   |  Milestone:  Tor:
 |  unspecified
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos, 032-unreached|
Parent ID:   | Points:  2
 Reviewer:   |Sponsor:
-+-
Changes (by rl1987):

 * owner:  (none) => rl1987
 * status:  new => accepted


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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:
 Type:  defect   | Status:  new
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.2.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos   |
Parent ID:   | Points:  2
 Reviewer:   |Sponsor:
-+-

Comment (by teor):

 Replying to [comment:1 teor]:
 > This is not such an important crash, because it only happens on
 platforms which remove resolv.conf (which as far as I know, is only macOS
 when the network is down). And I think it only happens on relays, not
 clients. But it would still be nice to fix it.

 Turns out this happens with some Linux configs, too.

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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:
 Type:  defect   | Status:  new
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.2.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos   |
Parent ID:   | Points:  2
 Reviewer:   |Sponsor:
-+-

Comment (by nickm):

 See also #15421

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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:
 Type:  defect   | Status:  new
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.2.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos   |
Parent ID:   | Points:  2
 Reviewer:   |Sponsor:
-+-

Comment (by teor):

 #449 is a similar issue with Hidden Services and DNS that doesn't resolve.

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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:
 Type:  defect   | Status:  new
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.2.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos   |
Parent ID:   | Points:  2
 Reviewer:   |Sponsor:
-+-

Comment (by teor):

 Replying to [comment:1 teor]:
 > Also, if you issue a SETCONF to tor while it's in this state, it will
 abort with:
 >
 > [err] set_options: Bug: Acting on config options left us in a broken
 state. Dying. (on Tor 0.2.9.9 008f2846b9b53d52)
 >
 > This is not such an important crash, because it only happens on
 platforms which remove resolv.conf (which as far as I know, is only macOS
 when the network is down). And I think it only happens on relays, not
 clients. But it would still be nice to fix it.

 Tor Browser could trigger this crash by issuing a SETCONF when the network
 is down, but it doesn't use local DNS in the default config, so I think
 that's ok.

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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:
 Type:  defect   | Status:  new
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.2.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos   |
Parent ID:   | Points:  2
 Reviewer:   |Sponsor:
-+-

Comment (by arma):

 Sounds like the fix is to treat a missing resolv.conf as being the same as
 an empty resolv.conf?

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Re: [tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
-+-
 Reporter:  teor |  Owner:
 Type:  defect   | Status:  new
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.2.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  technical-debt, dns, crash, tor- |  Actual Points:
  relay, macos   |
Parent ID:   | Points:  2
 Reviewer:   |Sponsor:
-+-
Changes (by teor):

 * keywords:  technical-debt, dns => technical-debt, dns, crash, tor-relay,
 macos


Comment:

 Also, if you issue a SETCONF to tor while it's in this state, it will
 abort with:

 [err] set_options: Bug: Acting on config options left us in a broken
 state. Dying. (on Tor 0.2.9.9 008f2846b9b53d52)

 This is not such an important crash, because it only happens on platforms
 which remove resolv.conf (which as far as I know, is only macOS when the
 network is down). And I think it only happens on relays, not clients. But
 it would still be nice to fix it.

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[tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

[Tor Bug Tracker & Wiki]

#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf 
is
empty
--+-
 Reporter:  teor  |  Owner:
 Type:  defect| Status:  new
 Priority:  Medium|  Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor  |Version:
 Severity:  Normal|   Keywords:  technical-debt, dns
Actual Points:|  Parent ID:
   Points:  2 |   Reviewer:
  Sponsor:|
--+-
 When tor's ServerDNSResolvConfFile (default /etc/resolv.conf) is missing,
 evdns does not add any name servers, and therefore Exits do not allow any
 exit traffic (not even IP-based traffic):
 {{{
 [debug] configure_nameservers: stat()ing /etc/resolv.conf
 [warn] Unable to stat resolver configuration in '/etc/resolv.conf': No
 such file or directory
 [info] mark_my_descriptor_dirty: Decided to publish new relay descriptor:
 dns resolvers failed
 }}}

 This happens on macOS when the network is down. On macOS, /etc/resolv.conf
 is symlinked to /var/run/resolv.conf. When the network is down, macOS
 deletes /var/run/resolv.conf, so the stat() call on /etc/resolv.conf
 fails.

 But when tor's ServerDNSResolvConfFile is empty, evdns adds a default name
 server (127.0.0.1:53 on my macOS), and therefore Exits allow exit traffic:
 {{{
 [info] eventdns: Parsing resolv.conf file /dev/null
 [info] eventdns: Added nameserver 127.0.0.1:53 as 0x61509e00
 [info] mark_my_descriptor_dirty: Decided to publish new relay descriptor:
 dns resolvers failed
 [info] eventdns: Parsing resolv.conf file /dev/null
 ...
 [info] mark_my_descriptor_dirty: Decided to publish new relay descriptor:
 dns resolvers back
 }}}

 We should also stop the extra descriptor upload:
 {{{
 [info] mark_my_descriptor_dirty: Decided to publish new relay descriptor:
 dns resolvers failed
 }}}

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