[Bug 1154599] Re: getaddrinfo() returns -11 (EAI_SYSTEM) instead of -2

[Thomas Hood]

Bug still present.

$ dpkg -l libc6
[...]
ii  libc6:amd64                                 2.17-93ubuntu4             amd64 

$ grep hosts /etc/nsswitch.conf
hosts:          files mdns4_minimal [NOTFOUND=return] dns mdns4

$ sudo su
# ./a.out
Making resolv.conf empty
Results of looking up www.google.com: status = -2, errno = 2
Results of looking up a bogus name: status = -2, errno = 2
Writing correct nameserver option to resolv.conf
Results of looking up www.google.com: status = 0, errno = 101
Results of looking up a bogus name: status = -2, errno = 2
Writing incorrect nameserver option to resolv.conf
Results of looking up www.google.com: status = -2, errno = 2
Results of looking up a bogus name: status = -2, errno = 2

# ifconfig eth0 down
# ./a.out
Making resolv.conf empty
Results of looking up www.google.com: status = -5, errno = 110
Results of looking up a bogus name: status = -5, errno = 110
Writing correct nameserver option to resolv.conf
Results of looking up www.google.com: status = -5, errno = 110
Results of looking up a bogus name: status = -5, errno = 110
Writing incorrect nameserver option to resolv.conf
Results of looking up www.google.com: status = -5, errno = 110
Results of looking up a bogus name: status = -5, errno = 110

# cat x.c
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <errno.h>
#include <stdio.h>

struct addrinfo *res;

void check_google()
{
    int status;
    status = getaddrinfo("www.google.com", NULL, NULL, &res);
    printf("Results of looking up www.google.com: status = %d, errno = %d\n", status, errno);
    status = getaddrinfo("sjfkdsjfswfloo0f02938sjf28398sd.com", NULL, NULL, &res);
    printf("Results of looking up a bogus name: status = %d, errno = %d\n", status, errno);
}

int main()
{
    FILE *fp;

    printf("Making resolv.conf empty\n");
    fp = fopen("/etc/resolv.conf", "w+"); fclose(fp);
    sleep(1);
    check_google();

    printf("Writing nameserver option to resolv.conf\n");
    fp = fopen("/etc/resolv.conf", "w+"); fprintf(fp, "nameserver 193.67.79.39\n"); fclose(fp);
    sleep(1);
    check_google();

    printf("Writing incorrect nameserver option to resolv.conf\n");
    fp = fopen("/etc/resolv.conf", "w+"); fprintf(fp, "nameserver 192.168.5.4\n"); fclose(fp);
    sleep(1);
    check_google();
}

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

Title:
  getaddrinfo() returns -11 (EAI_SYSTEM) instead of -2

Status in “eglibc” package in Ubuntu:
  Fix Released
Status in “python2.7” package in Ubuntu:
  Confirmed
Status in “eglibc” source package in Raring:
  New
Status in “python2.7” source package in Raring:
  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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