[Bug 1154599] [NEW] dns lookup failure raises socket.error not socket.gaierror

[Scott Moser]

Public bug reported:

$ cat lookup.py
#!/usr/bin/python
import sys, socket
names = ["slashdot.org", "foooooooooowhizzzzzzzz.com"]
if len(sys.argv) > 1:
   names = sys.argv[1:]
for iname in names:
    try:
        result = socket.getaddrinfo(iname, None, 0, 0, socket.SOCK_STREAM,
                                    socket.AI_CANONNAME)
        for (fam, stype, proto, cname, sockaddr) in result:
            sys.stdout.write("cname=%s, sockaddr=%s\n" % (cname, sockaddr))
    except socket.gaierror as error:
        sys.stderr.write("%s failed lookup" % iname)

$ python2.7 lookup.py
cname=slashdot.org, sockaddr=('216.34.181.45', 0)
Traceback (most recent call last):
  File "/tmp/x.py", line 10, in <module>
    socket.AI_CANONNAME)
socket.error: [Errno 2] No such file or directory

shell returned 1

$ dpkg -S /usr/bin/python2.7
python2.7-minimal: /usr/bin/python2.7
$ dpkg-query --show python2.7-minimal
python2.7-minimal	2.7.3-16ubuntu1

This is a behavioral change from quantal (2.7.3-5ubuntu4).

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: python 2.7.3-10ubuntu5
ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
Uname: Linux 3.5.0-21-generic x86_64
ApportVersion: 2.9.1-0ubuntu1
Architecture: amd64
Date: Wed Mar 13 09:52:55 2013
EcryptfsInUse: Yes
InstallationDate: Installed on 2011-10-19 (511 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: python-defaults
UpgradeStatus: Upgraded to raring on 2013-01-07 (64 days ago)

** Affects: python2.7 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug raring

** Package changed: python-defaults (Ubuntu) => python2.7 (Ubuntu)

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https://bugs.launchpad.net/bugs/1154599

Title:
  dns lookup failure raises socket.error not socket.gaierror

Status in “python2.7” package in Ubuntu:
  New

Bug description:
  $ cat lookup.py
  #!/usr/bin/python
  import sys, socket
  names = ["slashdot.org", "foooooooooowhizzzzzzzz.com"]
  if len(sys.argv) > 1:
     names = sys.argv[1:]
  for iname in names:
      try:
          result = socket.getaddrinfo(iname, None, 0, 0, socket.SOCK_STREAM,
                                      socket.AI_CANONNAME)
          for (fam, stype, proto, cname, sockaddr) in result:
              sys.stdout.write("cname=%s, sockaddr=%s\n" % (cname, sockaddr))
      except socket.gaierror as error:
          sys.stderr.write("%s failed lookup" % iname)

  $ python2.7 lookup.py
  cname=slashdot.org, sockaddr=('216.34.181.45', 0)
  Traceback (most recent call last):
    File "/tmp/x.py", line 10, in <module>
      socket.AI_CANONNAME)
  socket.error: [Errno 2] No such file or directory

  shell returned 1

  $ dpkg -S /usr/bin/python2.7
  python2.7-minimal: /usr/bin/python2.7
  $ dpkg-query --show python2.7-minimal
  python2.7-minimal	2.7.3-16ubuntu1

  This is a behavioral change from quantal (2.7.3-5ubuntu4).

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: python 2.7.3-10ubuntu5
  ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
  Uname: Linux 3.5.0-21-generic x86_64
  ApportVersion: 2.9.1-0ubuntu1
  Architecture: amd64
  Date: Wed Mar 13 09:52:55 2013
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2011-10-19 (511 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: python-defaults
  UpgradeStatus: Upgraded to raring on 2013-01-07 (64 days ago)

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