?: keys.gnupg.net: Host not found
Yuri Kanivetsky
yuri.kanivetsky at gmail.com
Mon Oct 12 00:47:01 CEST 2015
Hi,
I was able to track it down to this line of code:
http://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=blob;f=common/http.c;h=c2cac169d222ad5f41d1a8e224dd4bbaa2d7912b;hb=311816f6cf9d411dba060603e3c5d01c72824645#l2264
Here getaddrinfo() returns -3 (EAI_AGAIN) in the VM, but not on the host
machine. One can get there like so:
$ cat ~/dirmngr-input-alias
KEYSERVER --clear hkp://keys.gnupg.net
KS_GET 409B6B1796C275462A1703113804BB82D39DC0E3
BYE
$ gdb dirmngr/dirmngr
(gdb) break connect_server
(gdb) r < ~/dirmngr-input-alias
(gdb) u 2264
(gdb) n
(gdb) print $eax
$1 = -3
Here's a test program that doesn't work in VM, but works on the host
machine:
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <string.h>
int main(void) {
int r;
struct addrinfo hints, *res;
memset(&hints, 0, sizeof (hints));
hints.ai_socktype = SOCK_STREAM;
r = getaddrinfo("keys.gnupg.net", "11371", &hints, &res);
// r = getaddrinfo("pool.sks-keyservers.net", "11371", &hints,
&res);
if (r) {
printf("r: %hhi\n", r); // EAI_AGAIN
printf("r: %s\n", gai_strerror(r));
}
return 0;
}
$ gcc 1.c
$ ./a.out
r: -3
r: Temporary failure in name resolution
VM:
$ `ldd a.out | grep libc | awk '{ print $3 }'`
GNU C Library (Ubuntu GLIBC 2.21-0ubuntu4) stable release version 2.21,
by Roland McGrath et al.
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 4.9.2.
Available extensions:
crypt add-on version 2.1 by Michael Glad and others
GNU Libidn by Simon Josefsson
Native POSIX Threads Library by Ulrich Drepper et al
BIND-8.2.3-T5B
libc ABIs: UNIQUE IFUNC
For bug reporting instructions, please see:
<https://bugs.launchpad.net/ubuntu/+source/glibc/+bugs>.
host machine:
$ `ldd a.out | grep libc | awk '{ print $3 }'`
GNU C Library (GNU libc) stable release version 2.22, by Roland McGrath
et al.
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 5.2.0.
Available extensions:
crypt add-on version 2.1 by Michael Glad and others
GNU Libidn by Simon Josefsson
Native POSIX Threads Library by Ulrich Drepper et al
BIND-8.2.3-T5B
libc ABIs: UNIQUE IFUNC
For bug reporting instructions, please see:
<https://bugs.archlinux.org/>.
Can you confirm if it works with libc-2.22/libc-2.21 for you?
Regards,
Yuri
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