Bug #7183: Resolv::DNS::getresources throws Errno::EACCES: Permission denied - bind(2) on solaris

• Status: Closed
• Assignee: akr (Akira Tanaka)
• Target version: 2.6
• ruby -v: ruby 1.9.2p180 (2011-02-18 revision 30909) [i386-solaris2.10]

[frank_meier (Frank Meier)]

we have ruby running on Solaris. sometimes one of our tools fails with exception Errno::EACCES while calling Resolv::DNS::getresources. This only happens one out of thousands of times the tool is used.
After looking into lib/resolv.rb I saw, there is an optimistic loop in bind_random_port(), which looks to me it is thought of the possibility that a unusable port is selected (one that is used by another process), and if that happens it is tried again. Unfortunately it is only done when the exception is Errno::EADDRINUSE, what might be correct in Linux, but not Solaris (Sol10u6).

I propose to add Errno::EACCESS to the raise statement. Maybe a retry count limit as well:

def self.bind_random_port(udpsock, bind_host="0.0.0.0") # :nodoc:
  begin
    count += 1
    port = rangerand(1024..65535)
    udpsock.bind(bind_host, port)
  rescue Errno::EADDRINUSE, Errno::EACCESS => e
    if count < 10
      retry
    else
      raise e
    end
  end
end

[mame (Yusuke Endoh)]

• Status changed from Open to Assigned
• Assignee set to akr (Akira Tanaka)
• Target version changed from 1.9.3 to 2.0.0

Akr-san, could you check this?

--
Yusuke Endoh [e-mail]

[mame (Yusuke Endoh)]

• Target version changed from 2.0.0 to 2.6

[akr (Akira Tanaka)]

• Status changed from Assigned to Closed
• % Done changed from 0 to 100

This issue was solved with changeset r40112.
Frank, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

• lib/resolv.rb (bind_random_port): Rescue EACCES for SunOS.
  bind() on SunOS for port 2049 (nfs) and 4045 (lockd) causes
  EACCES with unprivileged process. cf. PRIV_SYS_NFS in privileges(5)
  [ruby-core:48064] [Bug #7183] reported by Frank Meier.