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getaddrinfo for "localhost" gives a strange IP-address

Subject: getaddrinfo for "localhost" gives a strange IP-address
From: Ville Mattila <email@hidden>
Date: Sun, 3 Jun 2007 20:52:52 +0300
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Hello,

In my imac I've got this strange problem. Executing ruby's testsuite will take a very long time. I've isolated the reason to resolving of "localhost" address. The ruby uses getaddrinfo. At the end o fthis mailis a test code that show this strange behaviour. Running it will give the following output

./test localhost
resolving name=localhost
family=30 sock_type=1 protocol=6 flags=0x0 canonname=(null)
ip=::1 serv=0
family=2 sock_type=1 protocol=6 flags=0x0 canonname=(null)
ip=173.19.2.144 serv=0
family=2 sock_type=1 protocol=6 flags=0x0 canonname=(null)
ip=127.0.0.1 serv=0.

Eg. the first localhost ip is "173.19.2.144". This IP is not configured in my mac. Here is the ifconfig -a lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384 inet 127.0.0.1 netmask 0xff000000 inet6 ::1 prefixlen 128 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280 stf0: flags=0<> mtu 1280 en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 00:17:f2:cd:43:55 media: autoselect status: inactive supported media: autoselect 10baseT/UTP <half-duplex> 10baseT/UTP <full-duplex> 10baseT/UTP <full-duplex,hw-loopback> 10baseT/UTP <full-duplex,flow-control> 100baseTX <half-duplex> 100baseTX <full-duplex> 100baseTX <full-duplex,hw-loopback> 100baseTX <full-duplex,flow-control> 1000baseT <full-duplex> 1000baseT <full- duplex,hw-loopback> 1000baseT <full-duplex,flow-control> none en1: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500 tunnel inet --> inet 192.168.222.2 netmask 0xffffff00 broadcast 192.168.222.255 ether 00:19:e3:0c:b2:d4 media: autoselect status: active supported media: autoselect vlan: 0 parent interface: <none> bond interfaces: <none> wlt1: flags=41<UP,RUNNING> mtu 1500 fw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 2030 lladdr 00:16:cb:ff:fe:76:5c:12 media: autoselect <full-duplex> status: inactive supported media: autoselect <full-duplex> vmnet8: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 inet 172.16.47.1 netmask 0xffffff00 broadcast 172.16.47.255 ether 00:50:56:c0:00:08 vmnet1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 inet 192.168.91.1 netmask 0xffffff00 broadcast 192.168.91.255 ether 00:50:56:c0:00:01 en2: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500 inet6 fe80::201:23ff:fe45:6789%en2 prefixlen 64 scopeid 0xa inet 10.37.129.2 netmask 0xffffff00 broadcast 10.37.129.255 ether 00:01:23:45:67:89 media: autoselect status: active supported media: autoselect en3: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500 inet6 fe80::210:32ff:fe54:7698%en3 prefixlen 64 scopeid 0xb inet 10.211.55.100 netmask 0xffffff00 broadcast 10.211.55.255 ether 00:10:32:54:76:98 media: autoselect status: active supported media: autoselect

I've got both vmware fusion and parallels installed neither of them was not running when I run the test program.

Here is the contests of /etc/hosts
cat /etc/hosts
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1       localhost Iso-Imakki
255.255.255.255 broadcasthost
::1             localhost
#127.0.0.1 localhost localhost. localhost.local localhost.localdomain

And here is the ouput of "nidump hosts /"
::1     localhost
127.0.0.1       localhost
255.255.255.255 broadcasthost


Finally the test program code.
--- cut --
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <string.h>
#include <stdio.h>
static char rcsid[] =
             "$Header$";
int main(int argc, char *argv[]) {
  struct addrinfo hints, *res, *res0;
  int error;
  char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
  char *name = "localhost";


  memset(&hints, 0, sizeof(hints));
  if (argc == 2) {
    name = argv[1];
  }
  printf("resolving name=%s\n", name);

hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_STREAM; error = getaddrinfo(name, NULL, &hints, &res0); if (error) { errx(1, "%s", gai_strerror(error)); /*NOTREACHED*/ } for (res = res0; res; res = res->ai_next) { printf("family=%d sock_type=%d protocol=%d flags=0x%x canonname=% s\n", res->ai_family, res->ai_socktype, res->ai_protocol, res->ai_flags, res->ai_canonname); memset(hbuf, 0, sizeof(hbuf)); memset(sbuf, 0, sizeof(sbuf)); error =getnameinfo(res->ai_addr, res->ai_addr->sa_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV/ * NI_NAMEREQD*/); if (error) { errx(1, "%s", gai_strerror(error)); }


    printf("ip=%s serv=%s\n", hbuf, sbuf);
  }
  freeaddrinfo(res0);
  return (0);
}
--- cut --


 - Ville

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